| 0/0 |
2026/08/10 08:20 |
flow |
repro-c |
27m
Results: map[EquivalenceAnalysis:The reproducer successfully triggered the underlying bug.
The original crash was a page fault in `iowrite32` called from `nhi_disable_interrupts` (via `nhi_mask_interrupt`), which accesses `nhi->iobase + 0x38208` (`REG_RING_INTERRUPT_MASK_CLEAR_BASE`).
The reproduced crash is a page fault in `ioread32` called directly from `nhi_probe`, which accesses `nhi->iobase + 0x39640` (`REG_CAPS`).
Both crashes are caused by the exact same root cause: the Thunderbolt driver (`nhi_pci_probe`) maps PCI BAR 0 using `pcim_iomap_region` without validating that the BAR length is large enough to cover the registers it accesses. If a malicious or virtual PCI device (like `syz_pci`) provides a very small BAR 0 (e.g., 4KB), `pcim_iomap_region` succeeds and maps only that small region. Subsequent accesses to registers at large offsets (like `0x39640` or `0x38208`) fall outside the mapped vmalloc region, leading to a page fault.
The difference in the exact crashing instruction and offset is a classic artifact of vmalloc layout randomness. In the original crash, the first out-of-bounds read at `0x39640` (`REG_CAPS`) coincidentally landed inside another valid vmalloc allocation, avoiding a page fault and reading garbage data. The execution then proceeded to `nhi_disable_interrupts`, where the out-of-bounds write at `0x38208` landed in an unmapped guard page, triggering the fault. In the reproduced crash, the vmalloc layout was different, and the very first out-of-bounds read at `0x39640` hit an unmapped page and faulted immediately.
The reproduced crash represents the exact same missing BAR size validation bug as the original crash. OtherCrashReports:<nil> ReproC:#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
if (write(fd, data, strlen(data)) < 0) {
printf("[-] Failed to write to %s: %s\n", path, strerror(errno));
} else {
printf("[+] Successfully wrote '%s' to %s\n", data, path);
}
close(fd);
} else {
printf("[-] Failed to open %s: %s\n", path, strerror(errno));
}
}
int main(void) {
printf("[*] Starting thunderbolt bug reproducer...\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
printf("[*] Found candidate device %s (vendor=%04x, device=%04x, BAR0 size=%llu)\n", ent->d_name, vendor, device, size);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%04x %04x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
// Wait a bit for async probe or crash
sleep(1);
}
}
closedir(dir);
printf("[+] Done.\n");
return 0;
}
Reproduced:true ReproducedBugTitle:BUG: unable to handle kernel paging request in ioread32 ReproducedCrashReport:thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
BUG: unable to handle page fault for address: ffffc90003c99640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 18bddc067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 5875 Comm: syz-executor277 Not tainted syzkaller #1 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_probe+0xcc/0x880 drivers/thunderbolt/nhi.c:1198
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbd4aa6bf7
Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fffa5b186f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555595193400 RCX: 00007fbbd4aa6bf7
RDX: 000000000000000c RSI: 0000555595195883 RDI: 0000000000000004
RBP: 00007fbbd4ae31e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000555595195883
R13: 00007fbbd4ae8bce R14: 00007fbbd4ae6e4c R15: 000000000001ffff
</TASK>
Modules linked in:
CR2: ffffc90003c99640
---[ end trace 0000000000000000 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: f3 0f 1e fa endbr64
12: 55 push %rbp
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
17: e8 a2 b2 e7 fc call 0xfce7b2be
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 94 b2 e7 fc call 0xfce7b2be
* 2a: 8b 03 mov (%rbx),%eax <-- trapping instruction
2c: eb 55 jmp 0x83
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0a jb 0x41
37: e8 82 b2 e7 fc call 0xfce7b2be
3c: 89 da mov %ebx,%edx
3e: ed in (%dx),%eax
3f: eb .byte 0xeb
]
|
| 1/1 |
2026/08/10 08:20 |
action |
kernel-checkouter |
0m
Results: map[KernelSrc:/app/workdir/cache/src/23f34877926e4a8386855e646fda4dd9dccd99b9]
|
| 2/1 |
2026/08/10 08:20 |
action |
kernel-builder |
0m
Results: map[KernelObj:/app/workdir/cache/build/a336c7a8629bc3d6298fba432a30764450022c13]
|
| 3/1 |
2026/08/10 08:20 |
action |
codesearch-prepare |
0m
Results: map[Index:codesearch-index]
|
| 4/1 |
2026/08/10 08:20 |
agent |
initial-researcher |
16m
Model:
Instruction: You are a security researcher with deep Linux kernel background.
Your goal is to analyze a Linux kernel bug description and propose a strategy to reproduce it
with a minimal, standalone C program for the strictly defensive purpose of verifying a bugfix.
=== TOOL SELECTION GUIDELINES ===
- When looking up C function or struct definitions, prefer codesearch-definition-source
and codesearch-struct-layout first.
- Fall back to read-file or grepper only if symbol lookup fails or when inspecting macros,
headers, or non-C files.
=== CRITICAL PROHIBITIONS ===
- Do NOT propose an exploit. Focus solely on minimal technical reproduction of the bug state.
- Do NOT write long explanations. Keep your analysis and strategy proposal concise.
- Do NOT assume that the target bug has already been fixed just because a git commit title
or description mentions a similar bug or fix. Commit messages often reference related issues
or partial fixes. Proceed with proposing a reproduction strategy regardless of historical fix commits.
Prefer calling several tools at the same time to save round-trips.
Prompt: Bug Description: BUG: unable to handle kernel paging request in iowrite32
thunderbolt 0000:00:07.0: timeout resetting host router
BUG: unable to handle page fault for address: ffffc90000f70208
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1b000067 P4D 1b000067 PUD 1c2b9067 PMD 30b6b067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_mask_interrupt drivers/thunderbolt/nhi.c:-1 [inline]
nhi_disable_interrupts+0x150/0x350 drivers/thunderbolt/nhi.c:162
nhi_probe+0x2be/0x880 drivers/thunderbolt/nhi.c:1211
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59e119e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dd5f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f59e1425fa0 RCX: 00007f59e119e019
RDX: 000000000000000d RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f59e123500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59e1426038 R14: 00007f59e1425fa0 R15: 00007fffc2eb28b8
</TASK>
Modules linked in:
CR2: ffffc90000f70208
---[ end trace 0000000000000000 ]---
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: f3 0f 1e fa endbr64
10: 55 push %rbp
11: 53 push %rbx
12: 48 89 f3 mov %rsi,%rbx
15: 89 fd mov %edi,%ebp
17: e8 00 ad e7 fc call 0xfce7ad1c
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 f2 ac e7 fc call 0xfce7ad1c
* 2a: 89 2b mov %ebp,(%rbx) <-- trapping instruction
2c: eb 52 jmp 0x80
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0c jb 0x43
37: e8 e0 ac e7 fc call 0xfce7ad1c
3c: 89 e8 mov %ebp,%eax
3e: 89 da mov %ebx,%edx
Reply: An analysis of the bug report and the kernel source code reveals that the crash is caused by an out-of-bounds memory access during the PCI probe of the Thunderbolt Native Host Interface (NHI) driver.
### Root Cause Analysis
1. **Missing BAR Size Validation**:
In `nhi_pci_probe()` (`drivers/thunderbolt/pci.c`), the driver maps the device's PCI BAR 0 using `pcim_iomap_region(pdev, 0, "thunderbolt")`. However, it never checks if the size of BAR 0 is large enough to cover the MMIO registers it expects to access.
2. **Out-of-Bounds Access**:
The NHI driver expects a BAR size of at least `0x39948` bytes (to cover registers up to `REG_FW_STS` at `0x39944`). If a device with a small BAR 0 (e.g., 4KB) is bound to the driver, `ioremap` will only map that small region.
When `nhi_probe()` is subsequently called, it attempts to read `REG_CAPS` at offset `0x39640`:
```c
nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
```
Because `0x39640` is far beyond the mapped 4KB region, this constitutes an out-of-bounds access.
3. **Crash Context**:
In the syzkaller report, the initial OOB read at `0x39640` likely fell into another coincidentally mapped vmalloc page, returning garbage data. This garbage data allowed the driver to proceed to `nhi_reset()` (which timed out, printing `"timeout resetting host router"`) and then to `nhi_disable_interrupts()`.
`nhi_disable_interrupts()` then attempted to write to `REG_RING_INTERRUPT_MASK_CLEAR_BASE` at offset `0x38208`. This offset fell into an unmapped vmalloc page, triggering the `#PF: supervisor write access in kernel mode` page fault in `iowrite32()`.
### Reproduction Strategy
To reproduce this bug, we need to trick the `thunderbolt` driver into probing a PCI device that has a memory BAR 0 smaller than `0x3a000`. We can achieve this from a standalone C program by abusing the sysfs `new_id` and `bind` interfaces to force the driver to bind to an existing, non-Thunderbolt PCI device with a small BAR.
1. **Scan PCI Devices**: Iterate through `/sys/bus/pci/devices/` to find a candidate PCI device.
2. **Filter Candidates**:
- Skip critical devices like Host/ISA bridges (Class `0x06xxxx`) and Mass Storage controllers (Class `0x01xxxx`) to prevent freezing the system or unmounting the rootfs.
- Read the `resource` file to ensure BAR 0 is a memory BAR (`flags & IORESOURCE_MEM`) and its size is greater than 0 but strictly less than `0x39640`.
3. **Force Bind**:
- Write the candidate device's name to its current driver's `unbind` file.
- Write the candidate's Vendor and Device ID to `/sys/bus/pci/drivers/thunderbolt/new_id`.
- Write the candidate's device name to `/sys/bus/pci/drivers/thunderbolt/bind`.
4. **Trigger**: The `thunderbolt` driver will probe the device, map its small BAR 0, and immediately perform an out-of-bounds MMIO access when reading/writing high-offset registers, reproducing the crash.
### Minimal C Reproducer Outline
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
int main() {
// Ensure the thunderbolt module is loaded
system("modprobe thunderbolt");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) return 1;
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
fscanf(f, "%x", &class_code);
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start, end, flags;
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
if (size > 0 && size < 0x39640) {
unsigned int vendor, device;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r"); fscanf(f, "%x", &vendor); fclose(f);
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r"); fscanf(f, "%x", &device); fclose(f);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
f = fopen(path, "w");
if (f) { fprintf(f, "%s", ent->d_name); fclose(f); }
// 2. Add ID to thunderbolt driver
f = fopen("/sys/bus/pci/drivers/thunderbolt/new_id", "w");
if (f) { fprintf(f, "%x %x", vendor, device); fclose(f); }
// 3. Bind to thunderbolt driver (Triggers the OOB access)
f = fopen("/sys/bus/pci/drivers/thunderbolt/bind", "w");
if (f) { fprintf(f, "%s", ent->d_name); fclose(f); }
// The kernel should panic here.
break;
}
}
closedir(dir);
return 0;
}
```
|
| 5/2 |
2026/08/10 08:20 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 5635
output: 37
thoughts: 428
Thoughts: **My Thought Process on the Thunderbolt Driver Kernel Crash**
Alright, I've got a kernel bug report in front of me: "BUG: unable to handle kernel paging request in iowrite32". This immediately flags a memory access issue within the kernel, specifically during an I/O write operation. The call trace points to the Thunderbolt (`nhi`) driver, and the crash occurs deep within the interrupt handling and probing functions (`nhi_mask_interrupt`, `nhi_disable_interrupts`, `nhi_probe`) and its PCI-specific probe function (`nhi_pci_probe`).
My first step is to dive into the relevant source files, `drivers/thunderbolt/nhi.c` and `drivers/thunderbolt/pci.c`. Given that this is a PCI driver probe, I'm looking at the sequence of events when the kernel attempts to initialize a Thunderbolt PCI device.
The bug report provides a crucial piece of context: the crash is triggered by a write to a sysfs `bind` file. This tells me that a user-space operation – specifically, a user trying to bind the Thunderbolt driver to a PCI device by writing to `/sys/bus/pci/drivers/.../bind` – is the catalyst. The target device is identified as a Thunderbolt host router.
The specific address causing the page fault is `ffffc90000f70208`. Initially, I might think of this as a Memory-Mapped I/O (MMIO) address, as `iowrite32` implies. However, a quick check reveals that this address range is actually characteristic of `vmalloc` or `ioremap` allocations. This raises a red flag: why would a properly `ioremap`ped or `vmalloc`ed address cause a page fault? Possible explanations immediately come to mind:
* The PCI device might not have been correctly initialized before this memory region was accessed.
* The `ioremap` call itself might have failed, leading to an invalid or unmapped address.
* The PCI device might have been removed or become inaccessible *after* its memory region was mapped but *before* it was accessed by `iowrite32`.
Then, I see the preceding kernel log message: `thunderbolt 0000:00:07.0: timeout resetting host router`. This is a critical clue. It indicates that before the page fault occurred, the Thunderbolt host router was in a state where it timed out during a reset operation. This timeout strongly suggests a problem with the device itself or its communication.
Putting it all together, the sequence is likely this: a user attempts to bind the Thunderbolt driver to a device. During the driver's probe (`nhi_probe`), it tries to interact with the Thunderbolt host router. This interaction, likely involving a reset or some critical initialization step, fails with a timeout. Because of this failure, the device might be in an unstable state, or the memory mapping associated with it might have become invalid or unmapped. When `nhi_disable_interrupts` (called from `nhi_probe`) then attempts to perform an `iowrite32` to this (now problematic) address, the kernel triggers a page fault because the underlying memory is no longer valid or accessible, leading to the observed crash. My next step would be to meticulously examine the `nhi_probe` function to understand exactly how it handles device initialization, error conditions, and memory mapping in the face of such a timeout.
|
| 6/2 |
2026/08/10 08:20 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_probe]
Results: map[SourceCode:1186: int nhi_probe(struct tb_nhi *nhi)
1187: {
1188: struct device *dev = nhi->dev;
1189: struct tb *tb;
1190: int res;
1191:
1192: if (!nhi->ops)
1193: return dev_err_probe(dev, -EINVAL, "NHI ops not set\n");
1194:
1195: if (!nhi->ops->init_interrupts)
1196: return dev_err_probe(dev, -EINVAL, "missing required NHI ops\n");
1197:
1198: nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
1199: dev_dbg(dev, "total paths: %d\n", nhi->hop_count);
1200:
1201: nhi->tx_rings = devm_kcalloc(dev, nhi->hop_count,
1202: sizeof(*nhi->tx_rings), GFP_KERNEL);
1203: nhi->rx_rings = devm_kcalloc(dev, nhi->hop_count,
1204: sizeof(*nhi->rx_rings), GFP_KERNEL);
1205: if (!nhi->tx_rings || !nhi->rx_rings)
1206: return -ENOMEM;
1207:
1208: nhi_reset(nhi);
1209:
1210: /* In case someone left them on. */
1211: nhi_disable_interrupts(nhi);
1212:
1213: res = nhi->ops->init_interrupts(nhi);
1214: if (res)
1215: return dev_err_probe(dev, res, "cannot enable interrupts, aborting\n");
1216:
1217: spin_lock_init(&nhi->lock);
1218:
1219: res = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
1220: if (res)
1221: return dev_err_probe(dev, res, "failed to set DMA mask\n");
1222:
1223: if (nhi->ops->init) {
1224: res = nhi->ops->init(nhi);
1225: if (res)
1226: return dev_err_probe(dev, res, "NHI specific init failed\n");
1227: }
1228:
1229: tb = nhi_select_cm(nhi);
1230: if (!tb)
1231: return dev_err_probe(dev, -ENODEV,
1232: "failed to determine connection manager, aborting\n");
1233:
1234: dev_dbg(dev, "NHI initialized, starting thunderbolt\n");
1235:
1236: init_completion(&nhi->domain_released);
1237:
1238: res = tb_domain_add(tb, host_reset);
1239: if (res) {
1240: /*
1241: * At this point the RX/TX rings might already have been
1242: * activated. Do a proper shutdown.
1243: */
1244: tb_domain_put(tb);
1245: wait_for_completion(&nhi->domain_released);
1246: nhi_shutdown(nhi);
1247: return dev_err_probe(dev, res, "failed to add domain\n");
1248: }
1249: dev_set_drvdata(dev, tb);
1250:
1251: device_wakeup_enable(dev);
1252:
1253: pm_runtime_allow(dev);
1254: pm_runtime_set_autosuspend_delay(dev, TB_AUTOSUSPEND_DELAY);
1255: pm_runtime_use_autosuspend(dev);
1256: pm_runtime_put_autosuspend(dev);
1257:
1258: return 0;
1259: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 7/2 |
2026/08/10 08:20 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 7283
output: 37
thoughts: 77
Thoughts: **My Diagnostic Journey**
I've been wrestling with this crash, and I think I've pinpointed its origin. My initial dive into the logs pointed me towards `nhi_disable_interrupts(nhi);` at line 1211 as the immediate culprit, where the system finally gave up. However, I'm not convinced that's the root cause. My gut, and the specific timeout message – `thunderbolt 0000:00:07.0: timeout resetting host router` – are strongly suggesting that the actual problem begins a few lines earlier, likely within the `nhi_reset(nhi);` function at line 1208. It seems the attempt to reset the host router is what's failing, and the subsequent disabling of interrupts is just a downstream consequence of that initial failure. This leads me to believe I need to focus my debugging efforts on the logic within `nhi_reset`.
|
| 8/2 |
2026/08/10 08:20 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_reset]
Results: map[SourceCode:1132: static void nhi_reset(struct tb_nhi *nhi)
1133: {
1134: ktime_t timeout;
1135: u32 val;
1136:
1137: val = ioread32(nhi->iobase + REG_CAPS);
1138: /* Reset only v2 and later routers */
1139: if (FIELD_GET(REG_CAPS_VERSION_MASK, val) < REG_CAPS_VERSION_2)
1140: return;
1141:
1142: if (!host_reset) {
1143: dev_dbg(nhi->dev, "skipping host router reset\n");
1144: return;
1145: }
1146:
1147: iowrite32(REG_RESET_HRR, nhi->iobase + REG_RESET);
1148: msleep(100);
1149:
1150: timeout = ktime_add_ms(ktime_get(), 500);
1151: do {
1152: val = ioread32(nhi->iobase + REG_RESET);
1153: if (!(val & REG_RESET_HRR)) {
1154: dev_warn(nhi->dev, "host router reset successful\n");
1155: return;
1156: }
1157: usleep_range(10, 20);
1158: } while (ktime_before(ktime_get(), timeout));
1159:
1160: dev_warn(nhi->dev, "timeout resetting host router\n");
1161: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 9/2 |
2026/08/10 08:20 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 7876
output: 40
thoughts: 59
Thoughts: **My Thought Process Regarding `nhi_reset` and Subsequent Interrupt Handling**
It's quite perplexing, really. I've noticed that when the `nhi_reset` function encounters a timeout while attempting to reset the host router, it simply outputs a message stating "timeout resetting host router." What's particularly concerning is that this timeout condition doesn't translate into an actual error return value from the function. Instead, it appears to proceed as if everything is fine, merely issuing a warning and continuing its execution flow. This lack of explicit error signaling is a significant point of concern for me, as it masks a critical failure.
Following this, I've observed that the `nhi_probe` function then proceeds to call `nhi_disable_interrupts(nhi);`. Given that `nhi_reset` might have failed silently due to a timeout, the subsequent disabling of interrupts feels like a potentially dangerous assumption. If the host router wasn't properly reset, disabling its interrupts could lead to an unstable or unpredictable system state. I need to understand the downstream implications of this. Is there an expectation that `nhi_reset` will *always* succeed, or is there a robust error-handling path that is being missed when the timeout occurs? The current behavior seems to imply a trust in the reset that might not be warranted, and this has significant implications for the overall reliability of the system's interrupt management.
|
| 10/2 |
2026/08/10 08:21 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_disable_interrupts]
Results: map[SourceCode: 152: /*
153: * nhi_disable_interrupts() - disable interrupts for all rings
154: *
155: * Use only during init and shutdown.
156: */
157: void nhi_disable_interrupts(struct tb_nhi *nhi)
158: {
159: int i = 0;
160: /* disable interrupts */
161: for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
162: nhi_mask_interrupt(nhi, ~0, 4 * i);
163:
164: /* clear interrupt status bits */
165: for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++)
166: nhi_clear_interrupt(nhi, 4 * i);
167: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 11/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 8239
output: 39
thoughts: 12
Thoughts: **My Thought Process on `nhi_mask_interrupt`**
Right, so the immediate impulse is to dive into the `nhi_mask_interrupt` function. I need to get a clear understanding of exactly *what* it's doing and *how* it's achieving it. This isn't just about a surface-level glance; as an expert, I'm looking for the nuances, the underlying mechanisms, and potential implications. I'll be dissecting its purpose – is it purely for disabling interrupts from a specific source (the "nhi" part)? Or does it involve more complex interrupt management, like acknowledging, clearing, or prioritizing?
My next step will be to scrutinize the implementation details. I'll be paying close attention to any bit manipulation, register accesses, or calls to other kernel functions. Are there any flags being set or cleared? Is there a specific interrupt controller being interacted with? I'll also be looking for any concurrency considerations – is this function designed to be called from multiple contexts simultaneously? If so, how is it ensuring atomicity and preventing race conditions?
Beyond the mechanics, I'll be considering the broader context. Where is `nhi_mask_interrupt` being invoked? What are the conditions under which it's called? Understanding its callers and the scenarios that trigger it is crucial for assessing its impact on system behavior. Is it part of error handling, normal operation, or a specific optimization path?
Finally, and this is where the "expert" lens really comes into play, I'll be thinking about potential side effects and optimizations. Could this function be inadvertently masking other, unrelated interrupts? Are there more efficient ways to achieve the same masking behavior, perhaps by leveraging hardware capabilities more directly or by using more generalized interrupt handling primitives? I'll also be considering its performance implications – how much overhead does this function introduce, and is that overhead acceptable given its purpose?
|
| 12/2 |
2026/08/10 08:21 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_mask_interrupt]
Results: map[SourceCode: 51: static void nhi_mask_interrupt(struct tb_nhi *nhi, int mask, int ring)
52: {
53: if (nhi->quirks & QUIRK_AUTO_CLEAR_INT) {
54: u32 val;
55:
56: val = ioread32(nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
57: iowrite32(val & ~mask, nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
58: } else {
59: iowrite32(mask, nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring);
60: }
61: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 13/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 8504
output: 40
thoughts: 208
Thoughts: **My Investigation into the `iowrite32` Crash**
Alright, so I've narrowed down the crash. It's happening specifically within the `iowrite32` function, and more precisely, within the `nhi_mask_interrupt` routine. My first question is, why is `iowrite32` even crashing? This function is supposed to be a straightforward memory-mapped I/O write.
I'm looking at the address it's trying to write to: `ffffc90000f70208`. Now, I can see how this address is derived. It's either `nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring` or `nhi->iobase + REG_RING_INTERRUPT_BASE + ring`. This immediately suggests that the problem might lie with `nhi->iobase` itself, or the underlying hardware region it represents.
My next thought is about the context. The crash occurred after `nhi_reset` timed out. This timeout is a significant clue. Could it be that the device was removed from the PCI bus *during* the reset process? Or, perhaps more critically, was the Memory-Mapped I/O (MMIO) region associated with `nhi->iobase` unmapped before this write attempt?
Then, a key realization hits me: this is likely a syzkaller-induced bug. Syzkaller is known for its ability to inject and manipulate devices. If syzkaller is *injecting* a PCI device, it has the capability to remove that device concurrently, or even manipulate its resources in ways that would lead to an invalid `nhi->iobase`.
So, the core issue seems to be that `nhi->iobase` is no longer valid, likely because the underlying MMIO region was unmapped or the device itself was removed. To confirm this, I need to dive into where `nhi->iobase` is actually mapped in the first place. My next step is to examine the `nhi_pci_probe` function, as that's where the initial mapping and setup should occur. I need to understand the lifecycle of that mapping and how it could become invalid, especially in the context of a race condition with device removal.
|
| 14/2 |
2026/08/10 08:21 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_probe]
Results: map[SourceCode: 447: static int nhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
448: {
449: struct device *dev = &pdev->dev;
450: struct tb_nhi_pci *nhi_pci;
451: struct tb_nhi *nhi;
452: int res;
453:
454: if (!nhi_pci_imr_valid(pdev))
455: return dev_err_probe(dev, -ENODEV, "firmware image not valid, aborting\n");
456:
457: res = pcim_enable_device(pdev);
458: if (res)
459: return dev_err_probe(dev, res, "cannot enable PCI device, aborting\n");
460:
461: nhi_pci = devm_kzalloc(dev, sizeof(*nhi_pci), GFP_KERNEL);
462: if (!nhi_pci)
463: return -ENOMEM;
464:
465: nhi = &nhi_pci->nhi;
466: nhi->dev = dev;
467: nhi->ops = (const struct tb_nhi_ops *)id->driver_data ?: &pci_nhi_default_ops;
468:
469: nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");
470: res = PTR_ERR_OR_ZERO(nhi->iobase);
471: if (res)
472: return dev_err_probe(dev, res, "cannot obtain PCI resources, aborting\n");
473:
474: nhi_pci_check_quirks(nhi_pci);
475: nhi_pci_check_iommu(nhi_pci);
476:
477: pci_set_master(pdev);
478:
479: return nhi_probe(&nhi_pci->nhi);
480: }
SourceFile:drivers/thunderbolt/pci.c]
|
| 15/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 9369
output: 42
thoughts: 240
Thoughts: **My Investigation into the Thunderbolt NHI Crash**
I'm currently trying to understand why my system is crashing with a page fault, specifically at `ffffc90000f70208`, indicating a supervisor write access to a non-present page. My initial thoughts led me to the `nhi->iobase` mapping, which is established via `pcim_iomap_region(pdev, 0, "thunderbolt");`. If this function call succeeds, `nhi->iobase` should indeed be a valid, remapped I/O address. So, the question is, how can such a seemingly valid address become unmapped, leading to this fault?
My first hypothesis was whether the PCI device itself might have been removed or detached *after* `pcim_iomap_region` was called but *before* the fault occurred. This could potentially lead to the region being unmapped. However, this seems unlikely given that the crash is occurring during the `nhi_pci_probe` function, suggesting the device should still be considered present and actively being probed.
Then, I reconsidered the `pcim_iomap_region` function's role. It's responsible for mapping the I/O region. If that mapping is valid, the problem must lie elsewhere. My attention then turned to potential access issues within the code that *uses* `nhi->iobase`. I'm specifically wondering if it's possible that `RING_INTERRUPT_REG_COUNT(nhi)` could be returning an unexpectedly large value. If this value is indeed excessively large, it could cause a `ring` access to go out of bounds of the *actually mapped* region, even if `nhi->iobase` itself points to a valid starting address. Therefore, my next step is to thoroughly examine the `RING_INTERRUPT_REG_COUNT` macro and its behavior in this context.
|
| 16/2 |
2026/08/10 08:21 |
tool |
codesearch-definition-source |
0m
Error:
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:RING_INTERRUPT_REG_COUNT]
Results: map[SourceCode: SourceFile:]
|
| 17/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 9656
output: 25
thoughts: 15
Thoughts: **My Thought Process:**
My immediate reaction upon encountering this piece of code or data is recognition: "Ah, it's a macro." This tells me I'm likely dealing with a predefined set of instructions or a template that will be expanded or interpreted by a specific system or language. The next logical step, born from this initial identification, is to investigate further. My immediate inclination is to "search for it." This means I need to understand its context, its definition, and its purpose. This search will likely involve looking for its declaration, its usage elsewhere in the codebase or system, and any associated documentation or comments that can shed light on what this macro *does*. Essentially, I'm initiating a diagnostic and investigative process to fully comprehend this macro's role and impact.
|
| 18/2 |
2026/08/10 08:21 |
tool |
grepper |
0m
Args: map[Expression:#define RING_INTERRUPT_REG_COUNT]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-99-#define REG_RING_INTERRUPT_BASE 0x38200
drivers/thunderbolt/nhi_regs.h:100:#define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
drivers/thunderbolt/nhi_regs.h-101-
]
|
| 19/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 9819
output: 29
thoughts: 306
Thoughts: **My Thought Process Regarding Interrupt Register Configuration**
Okay, let me trace through my thinking here about these interrupt registers. I'm looking at this macro, `RING_INTERRUPT_REG_COUNT(nhi)`, and it's defined as `((31 + 2 * nhi->hop_count) / 32)`. The critical piece here is `nhi->hop_count`, which I know is derived from reading the `REG_CAPS` register: `nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;`.
Now, a key piece of information I've ascertained is that `REG_CAPS` has an offset of `0x00`. This is important because it tells me where to look in the memory-mapped I/O space. The `& 0x3ff` mask means `nhi->hop_count` can range from 0 up to 1023 (0x3ff).
So, if `nhi->hop_count` reaches its maximum of 1023, plugging that into the `RING_INTERRUPT_REG_COUNT` macro gives me `(31 + 2 * 1023) / 32`. That simplifies to `(31 + 2046) / 32`, which results in `2077 / 32`. Performing that division, I get a value very close to 65, and since it's integer division, it rounds down to `64`. This means `RING_INTERRUPT_REG_COUNT` will be at most 64.
This number, 64, is significant because it dictates the number of iterations in a loop within the `nhi_disable_interrupts` function. That loop looks like this: `for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++) { nhi_mask_interrupt(nhi, ~0, 4 * i); }`.
Inside this loop, the `nhi_mask_interrupt` function is called. It performs a write operation to `nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring`. The `ring` part here is derived from `4 * i`, meaning it's an offset that increments in steps of 4 bytes. My initial estimate, based on common register layouts, is that `REG_RING_INTERRUPT_MASK_CLEAR_BASE` is likely located somewhere around the `0x38200` mark. My next logical step is to verify the exact offset of `REG_RING_INTERRUPT_MASK_CLEAR_BASE` to confirm the memory addresses being written to.
|
| 20/2 |
2026/08/10 08:21 |
tool |
grepper |
0m
Args: map[Expression:#define REG_RING_INTERRUPT_MASK_CLEAR_BASE]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-101-
drivers/thunderbolt/nhi_regs.h:102:#define REG_RING_INTERRUPT_MASK_CLEAR_BASE 0x38208
drivers/thunderbolt/nhi_regs.h-103-
]
|
| 21/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 10250
output: 40
thoughts: 347
Thoughts: **My Thought Process Regarding the Potential Out-of-Bounds Access**
Here's how I've been dissecting this issue:
I started by analyzing the core access pattern: the offset calculation is `0x38208 + 4 * i`. My immediate thought was to consider the maximum value `i` can reach. Given that `i` can go up to 64, the highest offset I calculated was `0x38208 + 256`, which equates to `0x38308`.
This raised a critical question in my mind: what is the actual size of PCI BAR 0? My concern was that if this BAR is smaller than `0x38308`, then the `ioremap` operation, which is responsible for mapping this I/O region into the kernel's address space, would only map the actual size of the BAR.
The implication of this is significant. If the mapped region is smaller than the maximum potential offset, then when the `nhi_mask_interrupt` function attempts to access `nhi->iobase + 0x38208`, it could very well be performing an access *outside* the bounds of the memory that was successfully mapped. This is a classic recipe for a crash or, worse, a security vulnerability.
To address this, I immediately looked at how the BAR is being mapped. I noted the call to `pcim_iomap_region(pdev, 0, "thunderbolt");`. My understanding is that this function, when called without a specific size argument, is intended to map the *entire* BAR 0.
However, my concern resurfaced when considering the context of syzkaller. I realized that syzkaller could be instrumental in creating a virtual PCI device where the BAR 0 is deliberately configured to be small, for example, just 4KB. In such a scenario, `ioremap` would indeed only map that 4KB region.
Then, I traced the execution flow. The `nhi_probe` function, in this hypothetical small BAR scenario, would first read `nhi->hop_count` from offset 0, which is safely within the 4KB mapping. But the critical failure point occurs immediately after, when it attempts to write to offset `0x38208`. This offset, at 229 KB, is *vastly* out of bounds for a 4KB mapping.
This led me to a deeper dive into `pcimim_iomap_region` itself. I re-checked its behavior, and my understanding is that it actually maps `pci_resource_len(pdev, 0)`. This confirms my fear: if `pci_resource_len` reports a small size, then `ioremap` will indeed map a small region.
My final, pressing question then became: is there any explicit check within `nhi_pci_probe` to validate the size of the BAR *before* attempting these potentially out-of-bounds accesses? This is the crucial piece of information I need to ascertain whether this potential vulnerability is indeed present in the code.
|
| 22/2 |
2026/08/10 08:21 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_probe]
Results: map[SourceCode: 447: static int nhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
448: {
449: struct device *dev = &pdev->dev;
450: struct tb_nhi_pci *nhi_pci;
451: struct tb_nhi *nhi;
452: int res;
453:
454: if (!nhi_pci_imr_valid(pdev))
455: return dev_err_probe(dev, -ENODEV, "firmware image not valid, aborting\n");
456:
457: res = pcim_enable_device(pdev);
458: if (res)
459: return dev_err_probe(dev, res, "cannot enable PCI device, aborting\n");
460:
461: nhi_pci = devm_kzalloc(dev, sizeof(*nhi_pci), GFP_KERNEL);
462: if (!nhi_pci)
463: return -ENOMEM;
464:
465: nhi = &nhi_pci->nhi;
466: nhi->dev = dev;
467: nhi->ops = (const struct tb_nhi_ops *)id->driver_data ?: &pci_nhi_default_ops;
468:
469: nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");
470: res = PTR_ERR_OR_ZERO(nhi->iobase);
471: if (res)
472: return dev_err_probe(dev, res, "cannot obtain PCI resources, aborting\n");
473:
474: nhi_pci_check_quirks(nhi_pci);
475: nhi_pci_check_iommu(nhi_pci);
476:
477: pci_set_master(pdev);
478:
479: return nhi_probe(&nhi_pci->nhi);
480: }
SourceFile:drivers/thunderbolt/pci.c]
|
| 23/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 11254
output: 18
thoughts: 390
Thoughts: **BAR Size Oversight and Necessary Checks**
I've just realized a critical oversight in my current implementation: there's no validation for the size of the BAR (Base Address Register). This is problematic because if `pci_resource_len(pdev, 0)`, which represents the actual BAR size, is smaller than the maximum register offset my driver attempts to access (which I've identified as `0x39000`), I'm going to end up with an out-of-bounds access. That's a recipe for disaster.
My immediate thought is to determine the *minimum* required BAR size for the Thunderbolt NHI (Network Host Interface). I need to ensure all potential register accesses are covered. I've been looking at specific register definitions. `REG_RING_INTERRUPT_MASK_CLEAR_BASE` is located at `0x38208`, and `REG_RING_NOTIFY_BASE` is at `0x37800`. This suggests that the BAR must be at least large enough to accommodate these, with some buffer. Specifically, `0x38208 + 4 * 64 = 0x38308` seems like a necessary minimum size.
However, I need to be more precise. The maximum offset isn't a fixed value; it's dynamic and depends on `nhi->hop_count`. Let's break this down. The formula for `RING_INTERRUPT_REG_COUNT` seems to be `(31 + 2 * nhi->hop_count) / 32`.
If `nhi->hop_count` is 0, this results in `(31 + 0) / 32 = 0`.
If `nhi->hop_count` is 1, it's `(31 + 2) / 32 = 1`.
And if `nhi->hop_count` reaches its maximum of `0x3ff` (1023), then `(31 + 2 * 1023) / 32 = (31 + 2046) / 32 = 2077 / 32`, which rounds down to 64.
Therefore, the *absolute maximum* register offset I might access is `0x38208 + 4 * 64 = 0x38308`.
This analysis of `nhi->hop_count` is crucial. I need to make sure that the BAR size is validated against this calculated maximum offset. I should also double-check the `nhi_regs.h` header file to confirm there are no other registers or structures that I might be accessing beyond this calculated maximum, as that would necessitate an even larger minimum BAR size. This is a critical security and stability concern that needs immediate attention.
|
| 24/2 |
2026/08/10 08:21 |
tool |
grepper |
0m
Args: map[Expression:#define REG_]
Results: map[Output:
Full output is too long, showing 500 out of 22435 lines.
Use more precise expression if possible.
arch/alpha/kernel/pc873xx.h-8- */
arch/alpha/kernel/pc873xx.h:9:#define REG_FER 0x00
arch/alpha/kernel/pc873xx.h:10:#define REG_FAR 0x01
arch/alpha/kernel/pc873xx.h:11:#define REG_PTR 0x02
arch/alpha/kernel/pc873xx.h:12:#define REG_FCR 0x03
arch/alpha/kernel/pc873xx.h:13:#define REG_PCR 0x04
arch/alpha/kernel/pc873xx.h:14:#define REG_KRR 0x05
arch/alpha/kernel/pc873xx.h:15:#define REG_PMC 0x06
arch/alpha/kernel/pc873xx.h:16:#define REG_TUP 0x07
arch/alpha/kernel/pc873xx.h:17:#define REG_SID 0x08
arch/alpha/kernel/pc873xx.h:18:#define REG_ASC 0x09
arch/alpha/kernel/pc873xx.h:19:#define REG_IRC 0x0e
arch/alpha/kernel/pc873xx.h-20-
--
arch/arc/include/asm/disasm.h=22=enum flow {
--
arch/arc/include/asm/disasm.h-71-#define STATUS32_L 0x00000100
arch/arc/include/asm/disasm.h:72:#define REG_LIMM 62
arch/arc/include/asm/disasm.h-73-
--
arch/arc/kernel/ptrace.c=15=struct pt_regs_offset {
--
arch/arc/kernel/ptrace.c-19-
arch/arc/kernel/ptrace.c:20:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/arc/kernel/ptrace.c:21:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/arc/kernel/ptrace.c-22-
--
arch/arc/kernel/ptrace.c=161=static int genregs_set(struct task_struct *target,
--
arch/arc/kernel/ptrace.c-169-
arch/arc/kernel/ptrace.c:170:#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
arch/arc/kernel/ptrace.c-171- if (!ret) \
--
arch/arc/kernel/ptrace.c-176-
arch/arc/kernel/ptrace.c:177:#define REG_IN_ONE(LOC, PTR) \
arch/arc/kernel/ptrace.c-178- if (!ret) \
--
arch/arc/kernel/ptrace.c-183-
arch/arc/kernel/ptrace.c:184:#define REG_IGNORE_ONE(LOC) \
arch/arc/kernel/ptrace.c-185- if (!ret) \
--
arch/arc/kernel/unwind.c=56=UNW_REGISTER_INFO};
--
arch/arc/kernel/unwind.c-61-#ifndef REG_INVALID
arch/arc/kernel/unwind.c:62:#define REG_INVALID(r) (reg_info[r].width == 0)
arch/arc/kernel/unwind.c-63-#endif
--
arch/arc/net/bpf_jit_arcv2.c=65=static const u8 bpf2arc[][2] = {
--
arch/arc/net/bpf_jit_arcv2.c-90-
arch/arc/net/bpf_jit_arcv2.c:91:#define REG_LO(r) (bpf2arc[(r)][0])
arch/arc/net/bpf_jit_arcv2.c:92:#define REG_HI(r) (bpf2arc[(r)][1])
arch/arc/net/bpf_jit_arcv2.c-93-
--
arch/arm/include/debug/brcmstb.S-6-/* Physical register offset and virtual register offset */
arch/arm/include/debug/brcmstb.S:7:#define REG_PHYS_BASE 0xf0000000
arch/arm/include/debug/brcmstb.S:8:#define REG_PHYS_BASE_V7 0x08000000
arch/arm/include/debug/brcmstb.S:9:#define REG_VIRT_BASE 0xfc000000
arch/arm/include/debug/brcmstb.S:10:#define REG_PHYS_ADDR(x) ((x) + REG_PHYS_BASE)
arch/arm/include/debug/brcmstb.S:11:#define REG_PHYS_ADDR_V7(x) ((x) + REG_PHYS_BASE_V7)
arch/arm/include/debug/brcmstb.S-12-
--
arch/arm/kernel/perf_regs.c=11=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/arm/kernel/perf_regs.c-18-
arch/arm/kernel/perf_regs.c:19:#define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
arch/arm/kernel/perf_regs.c-20-
--
arch/arm/kernel/ptrace.c-32-
arch/arm/kernel/ptrace.c:33:#define REG_PC 15
arch/arm/kernel/ptrace.c:34:#define REG_PSR 16
arch/arm/kernel/ptrace.c-35-/*
--
arch/arm/kernel/ptrace.c=59=struct pt_regs_offset {
--
arch/arm/kernel/ptrace.c-63-
arch/arm/kernel/ptrace.c:64:#define REG_OFFSET_NAME(r) \
arch/arm/kernel/ptrace.c-65- {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
arch/arm/kernel/ptrace.c:66:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/arm/kernel/ptrace.c-67-
--
arch/arm/mach-exynos/firmware.c=216=void __init exynos_firmware_init(void)
--
arch/arm/mach-exynos/firmware.c-237-
arch/arm/mach-exynos/firmware.c:238:#define REG_CPU_STATE_ADDR (sysram_ns_base_addr + 0x28)
arch/arm/mach-exynos/firmware.c-239-#define BOOT_MODE_MASK 0x1f
--
arch/arm/mach-exynos/suspend.c-35-
arch/arm/mach-exynos/suspend.c:36:#define REG_TABLE_END (-1U)
arch/arm/mach-exynos/suspend.c-37-
--
arch/arm/mach-hisi/platsmp.c=129=static const struct smp_operations hix5hd2_smp_ops __initconst = {
--
arch/arm/mach-hisi/platsmp.c-139-#define HIP01_BOOT_ADDRESS 0x80000000
arch/arm/mach-hisi/platsmp.c:140:#define REG_SC_CTRL 0x000
arch/arm/mach-hisi/platsmp.c-141-
--
arch/arm/mach-imx/anatop.c-15-
arch/arm/mach-imx/anatop.c:16:#define REG_SET 0x4
arch/arm/mach-imx/anatop.c:17:#define REG_CLR 0x8
arch/arm/mach-imx/anatop.c-18-
--
arch/arm/mach-omap2/omap_twl.c=40=static u8 smps_offset;
arch/arm/mach-omap2/omap_twl.c-41-
arch/arm/mach-omap2/omap_twl.c:42:#define REG_SMPS_OFFSET 0xE0
arch/arm/mach-omap2/omap_twl.c-43-
--
arch/arm/nwfpe/fpmodule.h-14-
arch/arm/nwfpe/fpmodule.h:15:#define REG_ORIG_R0 17
arch/arm/nwfpe/fpmodule.h:16:#define REG_CPSR 16
arch/arm/nwfpe/fpmodule.h:17:#define REG_PC 15
arch/arm/nwfpe/fpmodule.h:18:#define REG_LR 14
arch/arm/nwfpe/fpmodule.h:19:#define REG_SP 13
arch/arm/nwfpe/fpmodule.h:20:#define REG_IP 12
arch/arm/nwfpe/fpmodule.h:21:#define REG_FP 11
arch/arm/nwfpe/fpmodule.h:22:#define REG_R10 10
arch/arm/nwfpe/fpmodule.h:23:#define REG_R9 9
arch/arm/nwfpe/fpmodule.h:24:#define REG_R9 9
arch/arm/nwfpe/fpmodule.h:25:#define REG_R8 8
arch/arm/nwfpe/fpmodule.h:26:#define REG_R7 7
arch/arm/nwfpe/fpmodule.h:27:#define REG_R6 6
arch/arm/nwfpe/fpmodule.h:28:#define REG_R5 5
arch/arm/nwfpe/fpmodule.h:29:#define REG_R4 4
arch/arm/nwfpe/fpmodule.h:30:#define REG_R3 3
arch/arm/nwfpe/fpmodule.h:31:#define REG_R2 2
arch/arm/nwfpe/fpmodule.h:32:#define REG_R1 1
arch/arm/nwfpe/fpmodule.h:33:#define REG_R0 0
arch/arm/nwfpe/fpmodule.h-34-
--
arch/arm64/kernel/perf_regs.c=30=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/arm64/kernel/perf_regs.c-77-
arch/arm64/kernel/perf_regs.c:78:#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1))
arch/arm64/kernel/perf_regs.c-79-
--
arch/arm64/kernel/ptrace.c=48=struct pt_regs_offset {
--
arch/arm64/kernel/ptrace.c-52-
arch/arm64/kernel/ptrace.c:53:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/arm64/kernel/ptrace.c:54:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/arm64/kernel/ptrace.c-55-#define GPR_OFFSET_NAME(r) \
--
arch/arm64/kvm/sys_regs.h=62=struct sys_reg_desc {
--
arch/arm64/kvm/sys_regs.h-106-
arch/arm64/kvm/sys_regs.h:107:#define REG_HIDDEN (1 << 0) /* hidden from userspace and guest */
arch/arm64/kvm/sys_regs.h:108:#define REG_RAZ (1 << 1) /* RAZ from userspace and guest */
arch/arm64/kvm/sys_regs.h:109:#define REG_USER_WI (1 << 2) /* WI from userspace only */
arch/arm64/kvm/sys_regs.h-110-
--
arch/csky/kernel/perf_regs.c=11=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/csky/kernel/perf_regs.c-18-
arch/csky/kernel/perf_regs.c:19:#define REG_RESERVED (~((1ULL << PERF_REG_CSKY_MAX) - 1))
arch/csky/kernel/perf_regs.c-20-
--
arch/csky/kernel/ptrace.c=198=struct pt_regs_offset {
--
arch/csky/kernel/ptrace.c-202-
arch/csky/kernel/ptrace.c:203:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/csky/kernel/ptrace.c:204:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/csky/kernel/ptrace.c-205-
--
arch/loongarch/include/asm/asm.h-54-#if (SZREG == 4)
arch/loongarch/include/asm/asm.h:55:#define REG_L ld.w
arch/loongarch/include/asm/asm.h:56:#define REG_S st.w
arch/loongarch/include/asm/asm.h:57:#define REG_ADD add.w
arch/loongarch/include/asm/asm.h:58:#define REG_SUB sub.w
arch/loongarch/include/asm/asm.h-59-#else /* SZREG == 8 */
arch/loongarch/include/asm/asm.h:60:#define REG_L ld.d
arch/loongarch/include/asm/asm.h:61:#define REG_S st.d
arch/loongarch/include/asm/asm.h:62:#define REG_ADD add.d
arch/loongarch/include/asm/asm.h:63:#define REG_SUB sub.d
arch/loongarch/include/asm/asm.h-64-#endif
--
arch/loongarch/include/asm/loongarch.h-22-/* LoongArch Registers */
arch/loongarch/include/asm/loongarch.h:23:#define REG_ZERO 0x0
arch/loongarch/include/asm/loongarch.h:24:#define REG_RA 0x1
arch/loongarch/include/asm/loongarch.h:25:#define REG_TP 0x2
arch/loongarch/include/asm/loongarch.h:26:#define REG_SP 0x3
arch/loongarch/include/asm/loongarch.h:27:#define REG_A0 0x4 /* Reused as V0 for return value */
arch/loongarch/include/asm/loongarch.h:28:#define REG_A1 0x5 /* Reused as V1 for return value */
arch/loongarch/include/asm/loongarch.h:29:#define REG_A2 0x6
arch/loongarch/include/asm/loongarch.h:30:#define REG_A3 0x7
arch/loongarch/include/asm/loongarch.h:31:#define REG_A4 0x8
arch/loongarch/include/asm/loongarch.h:32:#define REG_A5 0x9
arch/loongarch/include/asm/loongarch.h:33:#define REG_A6 0xa
arch/loongarch/include/asm/loongarch.h:34:#define REG_A7 0xb
arch/loongarch/include/asm/loongarch.h:35:#define REG_T0 0xc
arch/loongarch/include/asm/loongarch.h:36:#define REG_T1 0xd
arch/loongarch/include/asm/loongarch.h:37:#define REG_T2 0xe
arch/loongarch/include/asm/loongarch.h:38:#define REG_T3 0xf
arch/loongarch/include/asm/loongarch.h:39:#define REG_T4 0x10
arch/loongarch/include/asm/loongarch.h:40:#define REG_T5 0x11
arch/loongarch/include/asm/loongarch.h:41:#define REG_T6 0x12
arch/loongarch/include/asm/loongarch.h:42:#define REG_T7 0x13
arch/loongarch/include/asm/loongarch.h:43:#define REG_T8 0x14
arch/loongarch/include/asm/loongarch.h:44:#define REG_U0 0x15 /* Kernel uses it as percpu base */
arch/loongarch/include/asm/loongarch.h:45:#define REG_FP 0x16
arch/loongarch/include/asm/loongarch.h:46:#define REG_S0 0x17
arch/loongarch/include/asm/loongarch.h:47:#define REG_S1 0x18
arch/loongarch/include/asm/loongarch.h:48:#define REG_S2 0x19
arch/loongarch/include/asm/loongarch.h:49:#define REG_S3 0x1a
arch/loongarch/include/asm/loongarch.h:50:#define REG_S4 0x1b
arch/loongarch/include/asm/loongarch.h:51:#define REG_S5 0x1c
arch/loongarch/include/asm/loongarch.h:52:#define REG_S6 0x1d
arch/loongarch/include/asm/loongarch.h:53:#define REG_S7 0x1e
arch/loongarch/include/asm/loongarch.h:54:#define REG_S8 0x1f
arch/loongarch/include/asm/loongarch.h-55-
--
arch/loongarch/kernel/ptrace.c=782=struct pt_regs_offset {
--
arch/loongarch/kernel/ptrace.c-786-
arch/loongarch/kernel/ptrace.c:787:#define REG_OFFSET_NAME(n, r) {.name = #n, .offset = offsetof(struct pt_regs, r)}
arch/loongarch/kernel/ptrace.c:788:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/loongarch/kernel/ptrace.c-789-
--
arch/loongarch/net/bpf_jit.c-25-
arch/loongarch/net/bpf_jit.c:26:#define REG_TCC LOONGARCH_GPR_A6
arch/loongarch/net/bpf_jit.c:27:#define REG_ARENA LOONGARCH_GPR_S6 /* For storing arena_vm_start */
arch/loongarch/net/bpf_jit.c-28-#define BPF_TAIL_CALL_CNT_PTR_STACK_OFF(stack) (round_up(stack, 16) - 80)
--
arch/loongarch/net/bpf_jit.c=629=static bool is_signed_bpf_cond(u8 cond)
--
arch/loongarch/net/bpf_jit.c-636-#define BPF_FIXUP_OFFSET_MASK GENMASK(26, 0)
arch/loongarch/net/bpf_jit.c:637:#define REG_DONT_CLEAR_MARKER 0
arch/loongarch/net/bpf_jit.c-638-
--
arch/mips/bmips/setup.c-33-
arch/mips/bmips/setup.c:34:#define REG_BCM6328_OTP ((void __iomem *)CKSEG1ADDR(0x1000062c))
arch/mips/bmips/setup.c-35-#define BCM6328_TP1_DISABLED BIT(9)
--
arch/mips/include/asm/asm.h=95=symbol = value
--
arch/mips/include/asm/asm.h-157-#if (_MIPS_SIM == _MIPS_SIM_ABI32)
arch/mips/include/asm/asm.h:158:#define REG_S sw
arch/mips/include/asm/asm.h:159:#define REG_L lw
arch/mips/include/asm/asm.h:160:#define REG_SUBU subu
arch/mips/include/asm/asm.h:161:#define REG_ADDU addu
arch/mips/include/asm/asm.h-162-#endif
arch/mips/include/asm/asm.h-163-#if (_MIPS_SIM == _MIPS_SIM_NABI32) || (_MIPS_SIM == _MIPS_SIM_ABI64)
arch/mips/include/asm/asm.h:164:#define REG_S sd
arch/mips/include/asm/asm.h:165:#define REG_L ld
arch/mips/include/asm/asm.h:166:#define REG_SUBU dsubu
arch/mips/include/asm/asm.h:167:#define REG_ADDU daddu
arch/mips/include/asm/asm.h-168-#endif
--
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h-1131-#define BCMPCI_REG_TIMERS 0x40
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h:1132:#define REG_TIMER_TRDY_SHIFT 0
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h:1133:#define REG_TIMER_TRDY_MASK (0xff << REG_TIMER_TRDY_SHIFT)
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h:1134:#define REG_TIMER_RETRY_SHIFT 8
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h:1135:#define REG_TIMER_RETRY_MASK (0xff << REG_TIMER_RETRY_SHIFT)
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h-1136-
--
arch/mips/kernel/ptrace.c=848=struct pt_regs_offset {
--
arch/mips/kernel/ptrace.c-852-
arch/mips/kernel/ptrace.c:853:#define REG_OFFSET_NAME(reg, r) { \
arch/mips/kernel/ptrace.c-854- .name = #reg, \
--
arch/mips/kernel/ptrace.c-857-
arch/mips/kernel/ptrace.c:858:#define REG_OFFSET_END { \
arch/mips/kernel/ptrace.c-859- .name = NULL, \
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h=19=extern sci_handler yeeloong_report_lid_status;
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-52-/* temperature & fan registers */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:53:#define REG_TEMPERATURE_VALUE 0xF458
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:54:#define REG_FAN_AUTO_MAN_SWITCH 0xF459
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-55-#define BIT_FAN_AUTO 0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-56-#define BIT_FAN_MANUAL 1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:57:#define REG_FAN_CONTROL 0xF4D2
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-58-#define BIT_FAN_CONTROL_ON (1 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-59-#define BIT_FAN_CONTROL_OFF (0 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:60:#define REG_FAN_STATUS 0xF4DA
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-61-#define BIT_FAN_STATUS_ON (1 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-62-#define BIT_FAN_STATUS_OFF (0 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:63:#define REG_FAN_SPEED_HIGH 0xFE22
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:64:#define REG_FAN_SPEED_LOW 0xFE23
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:65:#define REG_FAN_SPEED_LEVEL 0xF4CC
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-66-/* fan speed divider */
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-69-/* battery registers */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:70:#define REG_BAT_DESIGN_CAP_HIGH 0xF77D
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:71:#define REG_BAT_DESIGN_CAP_LOW 0xF77E
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:72:#define REG_BAT_FULLCHG_CAP_HIGH 0xF780
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:73:#define REG_BAT_FULLCHG_CAP_LOW 0xF781
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:74:#define REG_BAT_DESIGN_VOL_HIGH 0xF782
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:75:#define REG_BAT_DESIGN_VOL_LOW 0xF783
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:76:#define REG_BAT_CURRENT_HIGH 0xF784
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:77:#define REG_BAT_CURRENT_LOW 0xF785
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:78:#define REG_BAT_VOLTAGE_HIGH 0xF786
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:79:#define REG_BAT_VOLTAGE_LOW 0xF787
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:80:#define REG_BAT_TEMPERATURE_HIGH 0xF788
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:81:#define REG_BAT_TEMPERATURE_LOW 0xF789
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:82:#define REG_BAT_RELATIVE_CAP_HIGH 0xF492
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:83:#define REG_BAT_RELATIVE_CAP_LOW 0xF493
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:84:#define REG_BAT_VENDOR 0xF4C4
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-85-#define FLAG_BAT_VENDOR_SANYO 0x01
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-86-#define FLAG_BAT_VENDOR_SIMPLO 0x02
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:87:#define REG_BAT_CELL_COUNT 0xF4C6
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-88-#define FLAG_BAT_CELL_3S1P 0x03
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-89-#define FLAG_BAT_CELL_3S2P 0x06
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:90:#define REG_BAT_CHARGE 0xF4A2
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-91-#define FLAG_BAT_CHARGE_DISCHARGE 0x01
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-93-#define FLAG_BAT_CHARGE_ACPOWER 0x00
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:94:#define REG_BAT_STATUS 0xF4B0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-95-#define BIT_BAT_STATUS_LOW (1 << 5)
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-98-#define BIT_BAT_STATUS_IN (1 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:99:#define REG_BAT_CHARGE_STATUS 0xF4B1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-100-#define BIT_BAT_CHARGE_STATUS_OVERTEMP (1 << 2)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-101-#define BIT_BAT_CHARGE_STATUS_PRECHG (1 << 1)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:102:#define REG_BAT_STATE 0xF482
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-103-#define BIT_BAT_STATE_CHARGING (1 << 1)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-104-#define BIT_BAT_STATE_DISCHARGING (1 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:105:#define REG_BAT_POWER 0xF440
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-106-#define BIT_BAT_POWER_S3 (1 << 2)
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-111-/* Audio: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:112:#define REG_AUDIO_VOLUME 0xF46C
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:113:#define REG_AUDIO_MUTE 0xF4E7
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:114:#define REG_AUDIO_BEEP 0xF4D0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-115-/* USB port power or not: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:116:#define REG_USB0_FLAG 0xF461
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:117:#define REG_USB1_FLAG 0xF462
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:118:#define REG_USB2_FLAG 0xF463
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-119-#define BIT_USB_FLAG_ON 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-121-/* LID */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:122:#define REG_LID_DETECT 0xF4BD
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-123-#define BIT_LID_DETECT_ON 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-125-/* CRT */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:126:#define REG_CRT_DETECT 0xF4AD
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-127-#define BIT_CRT_DETECT_PLUG 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-129-/* LCD backlight brightness adjust: 9 levels */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:130:#define REG_DISPLAY_BRIGHTNESS 0xF4F5
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-131-/* Black screen Status */
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-134-/* LCD backlight control: off/restore */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:135:#define REG_BACKLIGHT_CTRL 0xF7BD
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-136-#define BIT_BACKLIGHT_ON 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-138-/* Reset the machine auto-clear: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:139:#define REG_RESET 0xF4EC
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-140-#define BIT_RESET_ON 1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-141-/* Light the led: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:142:#define REG_LED 0xF4C8
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-143-#define BIT_LED_RED_POWER (1 << 0)
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-148-/* Test led mode, all led on/off */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:149:#define REG_LED_TEST 0xF4C2
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-150-#define BIT_LED_TEST_IN 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-152-/* Camera on/off */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:153:#define REG_CAMERA_STATUS 0xF46A
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-154-#define BIT_CAMERA_STATUS_ON 1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-155-#define BIT_CAMERA_STATUS_OFF 0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:156:#define REG_CAMERA_CONTROL 0xF7B7
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-157-#define BIT_CAMERA_CONTROL_OFF 0
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-159-/* Wlan Status */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:160:#define REG_WLAN 0xF4FA
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-161-#define BIT_WLAN_ON 1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-162-#define BIT_WLAN_OFF 0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:163:#define REG_DISPLAY_LCD 0xF79F
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-164-
--
arch/mips/loongson2ef/lemote-2f/reset.c=75=static void ml2f_reboot(void)
--
arch/mips/loongson2ef/lemote-2f/reset.c-88-#define EC_SHUTDOWN_IO_PORT_DATA 0xff2f
arch/mips/loongson2ef/lemote-2f/reset.c:89:#define REG_SHUTDOWN_HIGH 0xFC
arch/mips/loongson2ef/lemote-2f/reset.c:90:#define REG_SHUTDOWN_LOW 0x29
arch/mips/loongson2ef/lemote-2f/reset.c-91-#define BIT_SHUTDOWN_ON (1 << 1)
--
arch/mips/n64/init.c=46=void __init prom_init(void)
--
arch/mips/n64/init.c-52-#define H 240
arch/mips/n64/init.c:53:#define REG_BASE ((u32 __iomem *) CKSEG1ADDR(0x4400000))
arch/mips/n64/init.c-54-
--
arch/mips/ralink/ill_acc.c-14-
arch/mips/ralink/ill_acc.c:15:#define REG_ILL_ACC_ADDR 0x10
arch/mips/ralink/ill_acc.c:16:#define REG_ILL_ACC_TYPE 0x14
arch/mips/ralink/ill_acc.c-17-
--
arch/nios2/kernel/ptrace.c=46=static int genregs_set(struct task_struct *target,
--
arch/nios2/kernel/ptrace.c-54-
arch/nios2/kernel/ptrace.c:55:#define REG_IGNORE_RANGE(START, END) \
arch/nios2/kernel/ptrace.c-56- if (!ret) \
--
arch/nios2/kernel/ptrace.c-59-
arch/nios2/kernel/ptrace.c:60:#define REG_IN_ONE(PTR, LOC) \
arch/nios2/kernel/ptrace.c-61- if (!ret) \
--
arch/nios2/kernel/ptrace.c-64-
arch/nios2/kernel/ptrace.c:65:#define REG_IN_RANGE(PTR, START, END) \
arch/nios2/kernel/ptrace.c-66- if (!ret) \
--
arch/openrisc/kernel/ptrace.c=163=struct pt_regs_offset {
--
arch/openrisc/kernel/ptrace.c-167-
arch/openrisc/kernel/ptrace.c:168:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/openrisc/kernel/ptrace.c:169:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/openrisc/kernel/ptrace.c-170-
--
arch/parisc/include/asm/assembly.h-15-#define CALLEE_REG_FRAME_SIZE 144
arch/parisc/include/asm/assembly.h:16:#define REG_SZ 8
arch/parisc/include/asm/assembly.h-17-#define ASM_ULONG_INSN .dword
--
arch/parisc/include/asm/assembly.h-21-#define CALLEE_REG_FRAME_SIZE 128
arch/parisc/include/asm/assembly.h:22:#define REG_SZ 4
arch/parisc/include/asm/assembly.h-23-#define ASM_ULONG_INSN .word
--
arch/parisc/kernel/perf_regs.c=9=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/parisc/kernel/perf_regs.c-34-
arch/parisc/kernel/perf_regs.c:35:#define REG_RESERVED (~((1ULL << PERF_REG_PARISC_MAX) - 1))
arch/parisc/kernel/perf_regs.c-36-
--
arch/parisc/kernel/ptrace.c=663=struct pt_regs_offset {
--
arch/parisc/kernel/ptrace.c-667-
arch/parisc/kernel/ptrace.c:668:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/parisc/kernel/ptrace.c:669:#define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])}
arch/parisc/kernel/ptrace.c:670:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/parisc/kernel/ptrace.c-671-
--
arch/parisc/net/bpf_jit.h=65=struct hppa_jit_context {
--
arch/parisc/net/bpf_jit.h-76-
arch/parisc/net/bpf_jit.h:77:#define REG_SET_SEEN(ctx, nr) { if (ctx->reg_seen_collect) ctx->reg_seen |= BIT(nr); }
arch/parisc/net/bpf_jit.h:78:#define REG_SET_SEEN_ALL(ctx) { if (ctx->reg_seen_collect) ctx->reg_seen = -1; }
arch/parisc/net/bpf_jit.h:79:#define REG_FORCE_SEEN(ctx, nr) { ctx->reg_seen |= BIT(nr); }
arch/parisc/net/bpf_jit.h:80:#define REG_WAS_SEEN(ctx, nr) (ctx->reg_seen & BIT(nr))
arch/parisc/net/bpf_jit.h:81:#define REG_ALL_SEEN(ctx) (ctx->reg_seen == -1)
arch/parisc/net/bpf_jit.h-82-
arch/parisc/net/bpf_jit.h-83-#define HPPA_INSN_SIZE 4 /* bytes per HPPA asm instruction */
arch/parisc/net/bpf_jit.h:84:#define REG_SIZE REG_SZ /* bytes per native "long" word */
arch/parisc/net/bpf_jit.h-85-
--
arch/powerpc/kernel/ptrace/ptrace-view.c=10=struct pt_regs_offset {
--
arch/powerpc/kernel/ptrace/ptrace-view.c-15-#define STR(s) #s /* convert to string */
arch/powerpc/kernel/ptrace/ptrace-view.c:16:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/powerpc/kernel/ptrace/ptrace-view.c-17-#define GPR_OFFSET_NAME(num) \
--
arch/powerpc/kernel/ptrace/ptrace-view.c-19- {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
arch/powerpc/kernel/ptrace/ptrace-view.c:20:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/powerpc/kernel/ptrace/ptrace-view.c-21-
--
arch/powerpc/perf/perf_regs.c=16=u64 PERF_REG_EXTENDED_MASK;
--
arch/powerpc/perf/perf_regs.c-19-
arch/powerpc/perf/perf_regs.c:20:#define REG_RESERVED (~(PERF_REG_EXTENDED_MASK | PERF_REG_PMU_MASK))
arch/powerpc/perf/perf_regs.c-21-
--
arch/riscv/include/asm/asm.h-28-
arch/riscv/include/asm/asm.h:29:#define REG_L __REG_SEL(ld, lw)
arch/riscv/include/asm/asm.h:30:#define REG_S __REG_SEL(sd, sw)
arch/riscv/include/asm/asm.h:31:#define REG_SC __REG_SEL(sc.d, sc.w)
arch/riscv/include/asm/asm.h:32:#define REG_AMOSWAP_AQ __REG_SEL(amoswap.d.aq, amoswap.w.aq)
arch/riscv/include/asm/asm.h:33:#define REG_ASM __REG_SEL(.dword, .word)
arch/riscv/include/asm/asm.h-34-#define SZREG __REG_SEL(8, 4)
--
arch/riscv/include/asm/insn.h=284=static __always_inline bool riscv_insn_is_c_jalr(u32 code)
--
arch/riscv/include/asm/insn.h-396-
arch/riscv/include/asm/insn.h:397:#define REG_MASK \
arch/riscv/include/asm/insn.h-398- ((1 << (5 + LOG_REGBYTES)) - (1 << LOG_REGBYTES))
arch/riscv/include/asm/insn.h-399-
arch/riscv/include/asm/insn.h:400:#define REG_OFFSET(insn, pos) \
arch/riscv/include/asm/insn.h-401- (SHIFT_RIGHT((insn), (pos) - LOG_REGBYTES) & REG_MASK)
arch/riscv/include/asm/insn.h-402-
arch/riscv/include/asm/insn.h:403:#define REG_PTR(insn, pos, regs) \
arch/riscv/include/asm/insn.h-404- ((ulong *)((ulong)(regs) + REG_OFFSET(insn, pos)))
--
arch/riscv/include/asm/module.h=48=struct plt_entry {
--
arch/riscv/include/asm/module.h-60-#define OPC_JALR 0x0067
arch/riscv/include/asm/module.h:61:#define REG_T0 0x5
arch/riscv/include/asm/module.h:62:#define REG_T1 0x6
arch/riscv/include/asm/module.h-63-
--
arch/riscv/include/asm/ptrace.h=15=struct pt_regs {
--
arch/riscv/include/asm/ptrace.h-61-#ifdef CONFIG_64BIT
arch/riscv/include/asm/ptrace.h:62:#define REG_FMT "%016lx"
arch/riscv/include/asm/ptrace.h-63-#else
arch/riscv/include/asm/ptrace.h:64:#define REG_FMT "%08lx"
arch/riscv/include/asm/ptrace.h-65-#endif
--
arch/riscv/kernel/perf_regs.c=11=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/riscv/kernel/perf_regs.c-18-
arch/riscv/kernel/perf_regs.c:19:#define REG_RESERVED (~((1ULL << PERF_REG_RISCV_MAX) - 1))
]
|
| 25/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 24834
output: 25
thoughts: 29
Thoughts: **A Deep Dive into Thunderbolt Interrupt Handling**
My immediate thought process, when faced with the task of understanding or modifying Thunderbolt interrupt handling, is to ground myself in the foundational definitions. Where are these interrupts defined? What are their base addresses? This leads me directly to the kernel header file `drivers/thunderbolt/nhi_regs.h`. It's my go-to for low-level hardware register definitions, and specifically, I'm looking for the symbol `REG_RING_INTERRUPT_BASE`. This macro, or constant, is crucial because it will likely tell me the starting point in the memory-mapped I/O space where the ring buffer interrupts are mapped. From this base, I can then deduce the offsets for individual interrupt sources within that ring. Knowing this base address is fundamental to correctly configuring interrupt handlers, masking or unmasking specific interrupts, and ultimately, to efficiently processing the events that the Thunderbolt controller signals. It’s a critical piece of the puzzle for any advanced work on this subsystem.
|
| 26/2 |
2026/08/10 08:21 |
tool |
grepper |
0m
Args: map[Expression:#define REG_RING_INTERRUPT_BASE]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-98- */
drivers/thunderbolt/nhi_regs.h:99:#define REG_RING_INTERRUPT_BASE 0x38200
drivers/thunderbolt/nhi_regs.h-100-#define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
]
|
| 27/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 25011
output: 24
thoughts: 28
Thoughts: **My Thought Process:**
My initial step is to orient myself within the codebase. I'm looking to understand the specifics of how Thunderbolt interrupts are managed, particularly the "ring notification" mechanism. To do this, I know I need to examine the header files that define the hardware registers associated with the Thunderbolt Network Interface Host (NHI) controller. My hypothesis is that the base address for these ring notification registers will be defined in a configuration-related header file. Therefore, I've decided to navigate to `drivers/thunderbolt/nhi_regs.h`. My specific intention is to locate the macro or definition for `REG_RING_NOTIFY_BASE` within that file. This will give me the foundational address from which all other ring notification-related register offsets can be calculated, which is crucial for implementing the interrupt handling logic.
|
| 28/2 |
2026/08/10 08:21 |
tool |
grepper |
0m
Args: map[Expression:#define REG_RING_NOTIFY_BASE]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-89- */
drivers/thunderbolt/nhi_regs.h:90:#define REG_RING_NOTIFY_BASE 0x37800
drivers/thunderbolt/nhi_regs.h-91-#define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
]
|
| 29/2 |
2026/08/10 08:21 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 25183
output: 40
thoughts: 176
Thoughts: **My Thought Process Regarding the PCI Device and Potential Out-of-Bounds Access**
Okay, so I've been looking at this PCI device and its memory-mapped regions, and I'm trying to piece together a potential vulnerability. My current understanding is that the maximum offset I'm concerned about is around `0x38308`.
Now, let's consider the scenario where `syzkaller`, our fuzzing tool, presents a PCI device to the system. Specifically, I'm focusing on BAR 0, which is the primary memory-mapped region for many devices. If `syzkaller` configures this BAR 0 to be a mere 4KB in size (that's `0x1000` in hexadecimal), then the `ioremap` operation, which is responsible for mapping this physical device memory into the kernel's virtual address space, will consequently only map that same 4KB.
The problem arises in the `nhi_probe` function. This function, as I understand it, reads a value called `nhi->hop_count` from a register located at offset `0` within the mapped region, which is designated as `REG_CAPS`. If this `hop_count` value happens to be exceptionally large, say `1023` as an example, the code then attempts to access an offset of `0x38208`.
And here's the critical point: if the `ioremap` only established a 4KB mapping, then an access to `0x38208` is significantly *out of bounds* of that allocated 4KB region. This is precisely the kind of condition that would lead to a page fault – the kernel trying to access memory it hasn't mapped or doesn't have permission to access.
However, I just had a thought, and it's causing me to re-evaluate. I need to confirm how this region is actually mapped. I recall that `pcim_iomap_region` is the function responsible for this mapping. My immediate question is: does `pcim_iomap_region` perform any checks to ensure that the requested BAR size is at least a certain minimum? If there's a safeguard there that prevents mapping a BAR that's too small for the expected register accesses, then my current line of reasoning might be flawed. I need to go back and scrutinize the implementation of `nhi_pci_probe` again to see if any such checks are in place. This is crucial for understanding if this specific out-of-bounds access scenario is actually achievable.
|
| 30/2 |
2026/08/10 08:22 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_probe]
Results: map[SourceCode: 447: static int nhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
448: {
449: struct device *dev = &pdev->dev;
450: struct tb_nhi_pci *nhi_pci;
451: struct tb_nhi *nhi;
452: int res;
453:
454: if (!nhi_pci_imr_valid(pdev))
455: return dev_err_probe(dev, -ENODEV, "firmware image not valid, aborting\n");
456:
457: res = pcim_enable_device(pdev);
458: if (res)
459: return dev_err_probe(dev, res, "cannot enable PCI device, aborting\n");
460:
461: nhi_pci = devm_kzalloc(dev, sizeof(*nhi_pci), GFP_KERNEL);
462: if (!nhi_pci)
463: return -ENOMEM;
464:
465: nhi = &nhi_pci->nhi;
466: nhi->dev = dev;
467: nhi->ops = (const struct tb_nhi_ops *)id->driver_data ?: &pci_nhi_default_ops;
468:
469: nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");
470: res = PTR_ERR_OR_ZERO(nhi->iobase);
471: if (res)
472: return dev_err_probe(dev, res, "cannot obtain PCI resources, aborting\n");
473:
474: nhi_pci_check_quirks(nhi_pci);
475: nhi_pci_check_iommu(nhi_pci);
476:
477: pci_set_master(pdev);
478:
479: return nhi_probe(&nhi_pci->nhi);
480: }
SourceFile:drivers/thunderbolt/pci.c]
|
| 31/2 |
2026/08/10 08:22 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 26016
output: 37
thoughts: 171
Thoughts: **My Thought Process Regarding Thunderbolt NHI BAR Size**
Okay, so as I'm looking through this code, the first thing that jumps out at me is that there isn't any explicit check for the *minimum* size of the Base Address Register (BAR) being requested for the Thunderbolt Network Interface Host (NHI) device. This feels like a potential oversight.
My mind immediately goes to the implications of this. I'm thinking, "What if `pci_resource_len(pdev, 0)` – which represents the length of the first PCI resource, presumably the BAR we're interested in – comes back as smaller than some expected maximum offset?" If that happens, the system might end up mapping only a tiny region.
But then I pause and correct myself. The *actual* maximum offset we need to worry about isn't a fixed constant. It's dependent on `nhi->hop_count`. This `hop_count` value itself is read from `REG_CAPS`, which is located at offset 0. And `REG_CAPS` can potentially yield a `hop_count` value as high as 1023.
So, the real question then becomes: what happens if the BAR size itself is *smaller* than what's required to accommodate all the necessary registers, specifically up to the maximum offset dictated by `REG_CAPS`? If the BAR is too small, we might not even be able to read `REG_CAPS` properly, let alone anything else.
Therefore, the critical unknown I need to resolve is: what is the absolute *minimum* BAR size that's absolutely required for a functional Thunderbolt NHI device? To get to the bottom of this, I'm going to have to dive into the `nhi_probe` function and examine how the BAR is handled and what assumptions it makes about its size.
|
| 32/2 |
2026/08/10 08:22 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_probe]
Results: map[SourceCode:1186: int nhi_probe(struct tb_nhi *nhi)
1187: {
1188: struct device *dev = nhi->dev;
1189: struct tb *tb;
1190: int res;
1191:
1192: if (!nhi->ops)
1193: return dev_err_probe(dev, -EINVAL, "NHI ops not set\n");
1194:
1195: if (!nhi->ops->init_interrupts)
1196: return dev_err_probe(dev, -EINVAL, "missing required NHI ops\n");
1197:
1198: nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
1199: dev_dbg(dev, "total paths: %d\n", nhi->hop_count);
1200:
1201: nhi->tx_rings = devm_kcalloc(dev, nhi->hop_count,
1202: sizeof(*nhi->tx_rings), GFP_KERNEL);
1203: nhi->rx_rings = devm_kcalloc(dev, nhi->hop_count,
1204: sizeof(*nhi->rx_rings), GFP_KERNEL);
1205: if (!nhi->tx_rings || !nhi->rx_rings)
1206: return -ENOMEM;
1207:
1208: nhi_reset(nhi);
1209:
1210: /* In case someone left them on. */
1211: nhi_disable_interrupts(nhi);
1212:
1213: res = nhi->ops->init_interrupts(nhi);
1214: if (res)
1215: return dev_err_probe(dev, res, "cannot enable interrupts, aborting\n");
1216:
1217: spin_lock_init(&nhi->lock);
1218:
1219: res = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
1220: if (res)
1221: return dev_err_probe(dev, res, "failed to set DMA mask\n");
1222:
1223: if (nhi->ops->init) {
1224: res = nhi->ops->init(nhi);
1225: if (res)
1226: return dev_err_probe(dev, res, "NHI specific init failed\n");
1227: }
1228:
1229: tb = nhi_select_cm(nhi);
1230: if (!tb)
1231: return dev_err_probe(dev, -ENODEV,
1232: "failed to determine connection manager, aborting\n");
1233:
1234: dev_dbg(dev, "NHI initialized, starting thunderbolt\n");
1235:
1236: init_completion(&nhi->domain_released);
1237:
1238: res = tb_domain_add(tb, host_reset);
1239: if (res) {
1240: /*
1241: * At this point the RX/TX rings might already have been
1242: * activated. Do a proper shutdown.
1243: */
1244: tb_domain_put(tb);
1245: wait_for_completion(&nhi->domain_released);
1246: nhi_shutdown(nhi);
1247: return dev_err_probe(dev, res, "failed to add domain\n");
1248: }
1249: dev_set_drvdata(dev, tb);
1250:
1251: device_wakeup_enable(dev);
1252:
1253: pm_runtime_allow(dev);
1254: pm_runtime_set_autosuspend_delay(dev, TB_AUTOSUSPEND_DELAY);
1255: pm_runtime_use_autosuspend(dev);
1256: pm_runtime_put_autosuspend(dev);
1257:
1258: return 0;
1259: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 33/2 |
2026/08/10 08:22 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 27407
output: 37
thoughts: 385
Thoughts: **The Unexpected Journey to a BAR Out-of-Bounds Access**
My investigation began with a seemingly innocuous observation about interrupt counts. I noticed that if `nhi->hop_count` was zero, the calculation for `RING_INTERRUPT_REG_COUNT` yielded zero, specifically `31 / 32 = 0`. I double-checked this with the full formula, `(31 + 2 * 0) / 32`, which indeed still resulted in zero. This led me to a crucial insight: when `nhi->hop_count` is zero, the `nhi_disable_interrupts` function essentially becomes a no-op; it doesn't actually do anything.
However, my attention was immediately drawn to how `nhi->hop_count` itself is determined. It's read from `REG_CAPS`, which is located at offset 0. The critical constraint here is the BAR size. If the BAR size is a meager 4KB, then `REG_CAPS` is certainly within that mapped region. The plot thickened when I considered a specific value for `REG_CAPS`: 1023. If `REG_CAPS` read 1023, it would imply that `RING_INTERRUPT_REG_COUNT` should be 64.
This is where the problem really started to surface. If `RING_INTERRUPT_REG_COUNT` is 64, then the `nhi_disable_interrupts` function would attempt to access memory up to address `0x38308`. But, as established, the BAR size is only 4KB, meaning the valid memory region is far smaller. This discrepancy immediately pointed to an out-of-bounds access, precisely what the bug report indicated. The driver was attempting to read beyond the confines of its mapped memory space.
So, how would one go about reproducing this? The key would be to simulate the conditions. This would involve creating a virtual PCI device. Tools like `syzkaller` with its `syz_pci_device` functionality come to mind. The crucial aspects would be to configure this virtual device with a very small BAR 0, specifically 4KB. Furthermore, when the driver probes and reads from offset 0 – the location of `REG_CAPS` – it needs to receive a value that forces the subsequent interrupt calculation to be large. A value like 1023, as I identified, would serve this purpose perfectly.
Upon reviewing the bug report further, I noticed a specific call stack entry: `bind_store+0x1d0/0x220 drivers/base/bus.c:267`. This told me that the actual trigger was a user attempting to bind the driver to a specific device. Specifically, it was a write operation to `/sys/bus/pci/drivers/thunderbolt/bind`, indicating the driver in question is the Thunderbolt host router driver. To perfectly replicate this, I would also need to identify and use the correct PCI ID for this Thunderbolt host router device.
|
| 34/2 |
2026/08/10 08:22 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_ids]
Results: map[SourceCode: 496: static struct pci_device_id nhi_ids[] = {
497: /*
498: * We have to specify class, the TB bridges use the same device and
499: * vendor (sub)id on gen 1 and gen 2 controllers.
500: */
501: {
502: .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
503: .vendor = PCI_VENDOR_ID_INTEL,
504: .device = PCI_DEVICE_ID_INTEL_LIGHT_RIDGE,
505: .subvendor = 0x2222, .subdevice = 0x1111,
506: },
507: {
508: .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
509: .vendor = PCI_VENDOR_ID_INTEL,
510: .device = PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C,
511: .subvendor = 0x2222, .subdevice = 0x1111,
512: },
513: {
514: .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
515: .vendor = PCI_VENDOR_ID_INTEL,
516: .device = PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI,
517: .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID,
518: },
519: {
520: .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
521: .vendor = PCI_VENDOR_ID_INTEL,
522: .device = PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI,
523: .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID,
524: },
525:
526: /* Thunderbolt 3 */
527: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_NHI) },
528: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI) },
529: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI) },
530: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI) },
531: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI) },
532: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI) },
533: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI) },
534: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI) },
535: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_NHI) },
536: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_NHI) },
537: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICL_NHI0),
538: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
539: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICL_NHI1),
540: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
541: /* Thunderbolt 4 */
542: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL_NHI0),
543: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
544: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL_NHI1),
545: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
546: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL_H_NHI0),
547: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
548: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL_H_NHI1),
549: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
550: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ADL_NHI0),
551: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
552: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ADL_NHI1),
553: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
554: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_RPL_NHI0),
555: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
556: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_RPL_NHI1),
557: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
558: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MTL_M_NHI0),
559: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
560: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MTL_P_NHI0),
561: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
562: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MTL_P_NHI1),
563: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
564: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_LNL_NHI0),
565: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
566: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_LNL_NHI1),
567: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
568: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_PTL_M_NHI0),
569: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
570: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_PTL_M_NHI1),
571: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
572: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_PTL_P_NHI0),
573: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
574: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_PTL_P_NHI1),
575: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
576: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_WCL_NHI0),
577: .driver_data = (kernel_ulong_t)&icl_nhi_ops },
578: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HOST_80G_NHI) },
579: { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HOST_40G_NHI) },
580:
581: /* Any USB4 compliant host */
582: { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_USB4, ~0) },
583:
584: { 0,}
585: };
SourceFile:drivers/thunderbolt/pci.c]
|
| 35/2 |
2026/08/10 08:22 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 30186
output: 29
thoughts: 21
Thoughts: **My Thought Process**
My immediate objective is to ascertain the specific numerical identifier associated with the `PCI_DEVICE_ID_INTEL_LIGHT_RIDGE` constant. This is a critical piece of information for me because I need to understand exactly which hardware device this symbol represents within the context of PCI device enumeration. Knowing this value will allow me to perform precise lookups, confirm device compatibility, and potentially debug or integrate with this particular Intel Light Ridge device. Without this concrete numerical representation, the symbolic name is insufficient for direct system interaction or low-level hardware analysis. Therefore, I'm focused on retrieving this precise `PCI_DEVICE_ID_INTEL_LIGHT_RIDGE` value.
|
| 36/2 |
2026/08/10 08:22 |
tool |
grepper |
0m
Args: map[Expression:#define PCI_DEVICE_ID_INTEL_LIGHT_RIDGE]
Results: map[Output:include/linux/pci_ids.h-2745-#define PCI_DEVICE_ID_INTEL_82439 0x1250
include/linux/pci_ids.h:2746:#define PCI_DEVICE_ID_INTEL_LIGHT_RIDGE 0x1513 /* Tbt 1 Gen 1 */
include/linux/pci_ids.h-2747-#define PCI_DEVICE_ID_INTEL_EAGLE_RIDGE 0x151a
]
|
| 37/2 |
2026/08/10 08:22 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 30362
output: 19
thoughts: 398
Thoughts: **My Thought Process Regarding the Thunderbolt Driver Vulnerability**
Right, let's break down this Thunderbolt driver issue from my perspective. I've got this specific device in my sights: it's a PCI device with the Vendor ID `0x8086` (which immediately tells me it's Intel) and the Device ID `0x1513`. This particular device ID is crucial, as it seems to be the entry point for this bug.
The core of the problem, as I see it, is a combination of how the virtual PCI device is configured and how the `thunderbolt` driver interacts with it. The conditions that trigger the vulnerability are quite specific:
First, I need to set up a *virtual* PCI device. This isn't about a physical card, but rather a simulated one. For this virtual device, I'll configure it with that Intel Vendor ID (`0x8086`) and the problematic Device ID (`0x1513`).
Second, a key component is its Base Address Register 0 (BAR 0). The size of this BAR is critical; it needs to be 4KB or, more generally, anything less than `0x39000`. This constraint on the BAR size is a strong indicator that the driver might be making assumptions about memory layout or access ranges that aren't always met.
Third, and this is where things get really interesting, when the system tries to read from BAR 0 at offset `0x0` (which is labeled as `REG_CAPS` in the driver context), the device needs to return a *large value*. Specifically, something like `0xffffffff` is mentioned. This inflated capability value is likely misleading the driver into believing certain features or configurations are present when they aren't, or are much more extensive than they actually are.
Once these conditions are met, the attacker, or in this case, the user setting up the test environment, can then trigger the driver's attention. This is done by writing the PCI device's address string (like `0000:00:07.0`) to the `/sys/bus/pci/drivers/thunderbolt/bind` interface. This action tells the `thunderbolt` driver to probe and bind to this specific PCI device.
Now, the driver's `probe` function kicks in. It reads `nhi->hop_count` from that `REG_CAPS` location. Because of the fake large value (like `0xffffffff`) we've arranged, `nhi->hop_count` gets a value of 1023. This is a significantly large number, far exceeding what's probably a realistic hop count for any Thunderbolt device.
The driver then proceeds to call `nhi_disable_interrupts`. This function, in its current implementation, has a loop that iterates up to 64 times. Inside this loop, it attempts to write to memory locations calculated as `nhi->iobase + 0x38208 + 4 * i`. The `iobase` here refers to the memory-mapped I/O region of the device.
The problem is that the `0x38208` offset, when combined with the loop and the `4 * i` increment, leads to an out-of-bounds access *beyond* the allocated ioremapped region for the device. This transgression from the expected memory boundaries is what ultimately triggers a page fault, indicating an attempt to access memory that the process isn't allowed to touch. This is a classic out-of-bounds write scenario.
However, I've also noted a crucial detail from the bug report: the specific error message is `thunderbolt 0000:00:07.0: timeout resetting host router`. This immediately makes me pause and re-evaluate. This particular message suggests that the `nhi_reset` function is timing out. This implies that the vulnerability might not be directly in `nhi_disable_interrupts`'s out-of-bounds write, but rather in the preceding `nhi_reset` function itself, which is likely called before `nhi_disable_interrupts` in the probe sequence.
Looking into `nhi_reset`, I see it starts by reading `REG_CAPS` (at offset 0) to check the version. If the version is detected as 2 or greater, it then proceeds to write to `REG_RESET`. The offset for `REG_RESET` is something I need to confirm precisely. The mention of `REG_RING_INTERRUPT_BASE` at `0x38200` makes me wonder if `REG_RESET` is relative to that, or perhaps at `0x38200` itself. Regardless, the timeout in `nhi_reset` points to a potential issue with how it handles the reset operation, possibly due to the same misleading `REG_CAPS` value, or some other condition within that reset logic that leads to an infinite loop or an unresponsively slow operation. This timeout is the more immediate symptom, suggesting the bug might manifest earlier in the probe process than initially thought.
|
| 38/2 |
2026/08/10 08:22 |
tool |
grepper |
0m
Args: map[Expression:#define REG_RESET]
Results: map[Output:arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h=19=extern sci_handler yeeloong_report_lid_status;
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-138-/* Reset the machine auto-clear: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:139:#define REG_RESET 0xF4EC
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-140-#define BIT_RESET_ON 1
--
drivers/clk/berlin/bg2.c-42-#define REG_CLKSWITCH1 0x0168
drivers/clk/berlin/bg2.c:43:#define REG_RESET_TRIGGER 0x0178
drivers/clk/berlin/bg2.c:44:#define REG_RESET_STATUS0 0x017c
drivers/clk/berlin/bg2.c:45:#define REG_RESET_STATUS1 0x0180
drivers/clk/berlin/bg2.c-46-#define REG_SW_GENERIC0 0x0184
--
drivers/clk/clk-en7523.c-32-#define REG_CRYPTO_CLKSRC 0x200
drivers/clk/clk-en7523.c:33:#define REG_RESET_CONTROL2 0x830
drivers/clk/clk-en7523.c-34-#define REG_RESET2_CONTROL_PCIE2 BIT(27)
drivers/clk/clk-en7523.c:35:#define REG_RESET_CONTROL1 0x834
drivers/clk/clk-en7523.c-36-#define REG_RESET_CONTROL_PCIEHB BIT(29)
--
drivers/gpu/drm/bridge/ite-it6505.c-38-
drivers/gpu/drm/bridge/ite-it6505.c:39:#define REG_RESET_CTRL 0x05
drivers/gpu/drm/bridge/ite-it6505.c-40-#define VIDEO_RESET BIT(0)
--
drivers/hwmon/sg2042-mcu.c-25-#define REG_UPTIME 0x0b
drivers/hwmon/sg2042-mcu.c:26:#define REG_RESET_REASON 0x0d
drivers/hwmon/sg2042-mcu.c-27-#define REG_MCU_TYPE 0x18
--
drivers/media/dvb-frontends/lgs8gl5.c-19-
drivers/media/dvb-frontends/lgs8gl5.c:20:#define REG_RESET 0x02
drivers/media/dvb-frontends/lgs8gl5.c:21:#define REG_RESET_OFF 0x01
drivers/media/dvb-frontends/lgs8gl5.c-22-#define REG_03 0x03
--
drivers/media/usb/gspca/touptek.c=19=MODULE_LICENSE("GPL");
--
drivers/media/usb/gspca/touptek.c-122-#define REG_RED_GAIN 0x305A
drivers/media/usb/gspca/touptek.c:123:#define REG_RESET_REGISTER 0x301A
drivers/media/usb/gspca/touptek.c-124-#define REG_SCALE_M 0x0404
--
drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-121-
drivers/thunderbolt/nhi_regs.h:122:#define REG_RESET 0x39898
drivers/thunderbolt/nhi_regs.h:123:#define REG_RESET_HRR BIT(0)
drivers/thunderbolt/nhi_regs.h-124-
]
|
| 39/2 |
2026/08/10 08:22 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 31827
output: 37
thoughts: 195
Thoughts: **My Debugging Journey: Tracing a Potential Memory Access Issue**
Alright, so I've been digging into this behavior, and it seems there's a discrepancy I need to resolve. My initial observation is that the `REG_RESET` register is defined with the hexadecimal value `0x39898`. This immediately flags a concern because it implies that the `nhi_reset` function is attempting to access this specific memory address.
The crux of the problem arises when I consider the BAR (Base Address Register) size. If this BAR is only 4KB, then an offset of `0x39898` is clearly far beyond its allocated boundaries. This should, in theory, lead to an immediate access violation – a crash.
However, this is where things get puzzling. The system *isn't* crashing at the point where `nhi_reset` attempts to access `0x39898`. This leads me to question my initial assumption or to suspect that there's some underlying mechanism I'm not fully accounting for.
To get to the bottom of this, I'm now meticulously examining the crash stack trace. I've noticed that `nhi_reset` is actually invoked *before* `nhi_disable_interrupts` is called, as clearly shown in the code snippet:
```c
nhi_reset(nhi);
/* In case someone left them on. */
nhi_disable_interrupts(nhi);
```
This ordering is important. Given the potential out-of-bounds access I've identified, the fact that the crash *doesn't* occur within `nhi_reset` itself is the primary puzzle. My next step is to revisit the `nhi_reset` function's implementation in detail. I need to understand *why* it can seemingly access an address that appears to be out of bounds without immediately triggering an error. There must be a subtle aspect of its operation, or perhaps some prior state or hardware behavior, that is preventing the expected crash.
|
| 40/2 |
2026/08/10 08:22 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_reset]
Results: map[SourceCode:1132: static void nhi_reset(struct tb_nhi *nhi)
1133: {
1134: ktime_t timeout;
1135: u32 val;
1136:
1137: val = ioread32(nhi->iobase + REG_CAPS);
1138: /* Reset only v2 and later routers */
1139: if (FIELD_GET(REG_CAPS_VERSION_MASK, val) < REG_CAPS_VERSION_2)
1140: return;
1141:
1142: if (!host_reset) {
1143: dev_dbg(nhi->dev, "skipping host router reset\n");
1144: return;
1145: }
1146:
1147: iowrite32(REG_RESET_HRR, nhi->iobase + REG_RESET);
1148: msleep(100);
1149:
1150: timeout = ktime_add_ms(ktime_get(), 500);
1151: do {
1152: val = ioread32(nhi->iobase + REG_RESET);
1153: if (!(val & REG_RESET_HRR)) {
1154: dev_warn(nhi->dev, "host router reset successful\n");
1155: return;
1156: }
1157: usleep_range(10, 20);
1158: } while (ktime_before(ktime_get(), timeout));
1159:
1160: dev_warn(nhi->dev, "timeout resetting host router\n");
1161: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 41/2 |
2026/08/10 08:22 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 32538
output: 24
thoughts: 986
Thoughts: **My Thought Process Unraveling the Crash**
Initially, I was tracking a potential crash point related to `nhi_reset` accessing address `0x39898`. My expectation was that if the Base Address Register (BAR) size was a mere 4KB, such an access would certainly lead to a crash. However, the actual crash manifested elsewhere, specifically within `nhi_disable_interrupts` at `0x38208`. This discrepancy immediately piqued my interest.
My next step was to compare these addresses. I noted that `0x39898` is indeed larger than `0x38208`. I then considered a BAR size of, let's say, `0x39000`. Under this assumption, `0x39898` would be out of bounds. But if it's out of bounds, why did the crash occur at `0x38208` instead? This led me to a moment of clarification: `0x38208 + 4 * 64 = 0x38308`. This calculation seemed to be a tangent, but I kept it in mind.
I returned to the BAR size of `0x39000`. Again, `0x39898` is out of bounds, and `nhi_reset` accesses it. So why no crash there? The crucial piece of information was the actual crash address: `ffffc90000f70208`. I deduced that this address must be a result of adding `nhi->iobase` to some offset.
By working backward, I found that if `nhi->iobase` was `ffffc90000f38000`, then `ffffc90000f38000 + 0x38208` perfectly yielded the crash address `ffffc90000f70208`. This confirmed `nhi->iobase` as the base. Consequently, `nhi->iobase + REG_RESET` (which is `0x39898`) would be `ffffc90000f71898`. The burning question then became: why didn't the system crash at *this* address (`ffffc90000f71898`) if it crashed at `ffffc90000f70208`?
My initial thought was that perhaps `ffffc90000f71898` was mapped while `ffffc90000f70208` was not. However, I quickly dismissed this, as `ioremap` typically maps a contiguous range of pages. If a range is mapped, all addresses within it should be accessible.
I then considered a BAR size of `0x40000` (256KB). With this size, both `0x38208` and `0x39898` would comfortably fall within the mapped region. This brought me back to the same puzzle: if `0x38208` is within the mapped region, why the page fault there?
The key to understanding the page fault at `ffffc90000f70208` lay in the error code: `0x0002` – a not-present page with supervisor write access. This unequivocally signifies that the page was *not* mapped. This directly contradicted my assumption of a `0x40000` BAR size.
The only logical conclusion was that the BAR size must be smaller than `0x38208`. I hypothesized a BAR size of `0x38000` (224KB). If this were the case, then `0x38208` would indeed be out of bounds, explaining the crash. But, if the BAR size is `0x38000`, then `0x39898` would *also* be out of bounds! So why did `nhi_reset` not crash?
This led me to re-examine `nhi_reset` itself. I saw the crucial `if` condition:
```c
val = ioread32(nhi->iobase + REG_CAPS);
/* Reset only v2 and later routers */
if (FIELD_GET(REG_CAPS_VERSION_MASK, val) < REG_CAPS_VERSION_2)
return;
```
This revealed that `nhi_reset` could simply return early if the router version (read from `REG_CAPS`) was less than version 2. This conditional return would explain why `nhi_reset` didn't trigger a crash, even if `0x39898` was out of bounds, by preventing the out-of-bounds access in the first place. The next critical step was to understand the role of `REG_CAPS_VERSION_MASK`.
|
| 42/2 |
2026/08/10 08:23 |
tool |
grepper |
0m
Args: map[Expression:#define REG_CAPS_VERSION_MASK]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-114-#define REG_CAPS 0x39640
drivers/thunderbolt/nhi_regs.h:115:#define REG_CAPS_VERSION_MASK GENMASK(23, 16)
drivers/thunderbolt/nhi_regs.h-116-#define REG_CAPS_VERSION_2 0x40
]
|
| 43/2 |
2026/08/10 08:23 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 33669
output: 40
thoughts: 1166
Thoughts: **My Thought Process on the Crash and Register Mapping**
This is quite the puzzle regarding the PCI device's memory-mapped I/O (MMIO) region. My initial understanding was that `REG_CAPS` held a value of `0`, but it's actually `0x39640`. This immediately raised a flag because the `nhi_probe` function accesses `nhi->iobase + REG_CAPS`. If `REG_CAPS` is indeed `0x39640`, then the probe function is trying to read from that specific offset.
The real concern here is the BAR size. If the BAR is small, say only 4KB, then an attempt to access `0x39640` would certainly cause a crash. However, the system *didn't* crash at `0x39640`. It crashed at `0x38208`. This suggests something is amiss with how these addresses are being mapped or accessed.
My first thought was that perhaps `0x39640` was mapped but `0x38208` was not. But that doesn't make sense with how `ioremap` works. `ioremap` maps a contiguous range of physical memory into the kernel's virtual address space. If `0x39640` is accessible, and it's within the same `ioremap`'d region as `0x38208`, then `0x38208` *must* also be accessible, unless the BAR is incredibly large and `ioremap` somehow failed to map a portion of it, which is unlikely. `ioremap` typically succeeds or fails entirely.
Could it be a permissions issue? Maybe `0x38208` was mapped as read-only? Again, this contradicts how `ioremap` functions; it generally maps memory as read-write.
Then I questioned my assumption about `nhi->iobase` being the *actual* start of the BAR. But `nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");` clearly indicates it's mapping BAR 0. If `pcim_iomap_region` successfully maps the BAR, it should map the *entire* BAR.
What if the BAR size is much larger, say `0x40000` (256KB)? In that scenario, both `0x38208` and `0x39640` would fall within the BAR. So, why the crash at `0x38208`?
I re-examined the crash address, `ffffc90000f70208`, and the instruction `mov %ebp,(%rbx)`, where `%rbx` points to the crash address. This instruction is a write operation. This led me to look at the `nhi_mask_interrupt` function. This function performs writes to `nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring`.
Crucially, `REG_RING_INTERRUPT_MASK_CLEAR_BASE` is `0x38208`. The `ring` offset is calculated as `4 * i`. If `i` is sufficiently large, this offset could push the access beyond the BAR. However, my calculation showed that even with a large `hop_count` from `REG_CAPS` (`0x39640`), the calculated `ring` offset for `i=64` (resulting in `0x38308`) is still *less* than the `REG_CAPS` address. If `0x39640` was accessible, then `0x38308` should be too.
This brings me back to the crash at `0x38208` itself. If `0x39640` was mapped and readable, and the BAR is large enough to contain both, why would a write operation to `0x38208` cause a fault?
Then I noticed a specific quirk in `nhi_mask_interrupt`:
```c
if (nhi->quirks & QUIRK_AUTO_CLEAR_INT) {
// ... read-modify-write to REG_RING_INTERRUPT_BASE + ring
} else {
iowrite32(mask, nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring);
}
```
The problematic write to `REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring` (which is `0x38208` when `ring` is 0) occurs when `QUIRK_AUTO_CLEAR_INT` is *not* set. This is the branch that's being taken.
This makes me wonder if the issue isn't so much about an unmapped region, but rather a region that is *expected* to be writable and is being written to, but is somehow protected or invalid in a way that triggers a fault. The fact that it happens at `0x38208` precisely when the function attempts to write there, and this write is part of the non-quirky path, is highly suspicious. I need to delve deeper into `nhi_pci_probe` to understand the exact conditions under which `QUIRK_AUTO_CLEAR_INT` is set and what the implications are for this specific MMIO region.
|
| 44/2 |
2026/08/10 08:23 |
tool |
codesearch-definition-source |
0m
Error:
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_probe]
|
| 45/2 |
2026/08/10 08:23 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 34996
output: 35
thoughts: 279
Thoughts: **My Thought Process Regarding PCI Resource Handling and Potential Out-of-Bounds Access**
Okay, so I've just come across the `nhi_pci_probe` function, and my mind immediately jumps to potential failure scenarios. I see that `pcim_iomap_region` is being used to map the PCI device's I/O region, and this function, as I know, can return an error pointer if it fails. The code correctly checks for this with `PTR_ERR_OR_ZERO` and returns a `dev_err_probe` if an error occurs. That part seems robust enough.
However, my attention is then drawn to the success path. If `pcim_iomap_region` *does* succeed, it returns a valid pointer. This is where my concern starts to bloom. I'm thinking, what happens if the size of the Base Address Register (BAR) that was mapped is exactly `0x38000`? My immediate thought is that if the BAR size is indeed `0x38000`, then accessing an offset like `0x38208` would clearly be out of bounds.
But then, I recall that `REG_CAPS` is defined as `0x39640`. This immediately triggers another alarm in my mind: if the BAR size is only `0x38000`, then accessing `REG_CAPS` at `0x39640` would *also* be out of bounds! This is a critical observation.
The crucial question then becomes: why didn't the system crash when `REG_CAPS` was being read? This implies there's a subtle detail I might be overlooking or that the underlying hardware/software interaction is more forgiving than I initially assume, or perhaps there's a prior check that prevents this specific read from happening in the problematic scenario.
To understand this, I need to delve deeper into how `ioread32` actually functions. I know that on x86 architectures, `ioread32` is implemented within `lib/iomap.c`. My next step would be to examine that implementation closely to see if there are any built-in checks, assumptions, or mechanisms that could explain why an out-of-bounds read in this context might not immediately result in a crash, especially if the BAR mapping itself was successful up to `0x38000`. I suspect there might be some underlying PCI bus handling or memory management behavior that's masking this potential issue, or perhaps the BAR size is not as rigidly enforced as I'm initially thinking in this specific scenario.
|
| 46/2 |
2026/08/10 08:23 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:lib/iomap.c Name:ioread32]
Results: map[SourceCode: 97: unsigned int ioread32(const void __iomem *addr)
98: {
99: IO_COND(addr, return inl(port), return readl(addr));
100: return 0xffffffff;
101: }
SourceFile:lib/iomap.c]
|
| 47/2 |
2026/08/10 08:23 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 35394
output: 41
thoughts: 2896
Thoughts: **The Curious Case of the Unmapped MMIO Region**
I've been trying to get to the bottom of this rather perplexing crash, and I think I'm starting to piece together a clearer picture of what's going on, or rather, *not* going on, in this MMIO access.
Initially, I was focused on the `IO_COND` check, thinking it might be related to whether the `addr` was a PIO address or not. If it's a memory address, the code calls `readl(addr)`. My immediate concern, as any kernel developer would have, was that if `addr` falls outside the range of the memory region that was `ioremap`ped, `readl` would certainly trigger a page fault.
Then I started considering the `nhi->iobase`. I know that if it's an `ioremap`ped address, it resides within the `vmalloc` area, typically starting with `0xffffc900...`. The size of the BAR is crucial here. If the BAR size is, say, `0x40000`, `ioremap` will map that many bytes. Similarly, a `0x38000` BAR size maps `0x38000` bytes.
My reasoning then led me to believe that `ioremap` maps memory in PAGE_SIZE chunks. For a BAR size of `0x38000`, which is a multiple of 4KB, `ioremap` would map exactly `0x38000` bytes. This implies that an access to `0x38208` (which is `0x38000 + 0x208`) would land in the *next* page, a page that, according to this logic, should be unmapped, thus causing a page fault. The same logic applied to `0x39640` – it also seemed to fall into an unmapped page.
This is where the confusion really set in: if `0x38208` and `0x39640` are in unmapped pages, why didn't `ioread32(nhi->iobase + REG_CAPS)` – an access to `0x39640` – crash?
I re-examined the crash trace carefully. It clearly shows the fault occurring in `iowrite32` which is called by `nhi_mask_interrupt`. Looking at the call trace, `nhi_probe` calls `nhi_reset` *before* `nhi_disable_interrupts`. The relevant snippet in `nhi_probe` looks like this:
```c
nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
// ... allocation of tx_rings and rx_rings ...
nhi_reset(nhi);
nhi_disable_interrupts(nhi);
```
This sequence is critical. If `ioread32(nhi->iobase + REG_CAPS)` did *not* crash, it strongly suggests that the address `nhi->iobase + 0x39640` *was* mapped. If that address was mapped, and `ioremap` creates a contiguous virtual address range, then `nhi->iobase + 0x38208` *must* also be mapped, especially if the BAR size exceeds `0x39640`. So, why the page fault at `0x38208`?
I then focused on the crash address itself: `ffffc90000f70208`. The initial thought was that `nhi->iobase` was `ffffc90000f38000`. If that were the case, then `nhi->iobase + 0x38208` would indeed be `ffffc90000f70208`, and `nhi->iobase + 0x39640` would be `ffffc90000f71640`. The core of my confusion was how `ffffc90000f71640` could be mapped if `ffffc90000f70208` was not. This contradicts the contiguous mapping behavior of `ioremap`.
I started to question my assumption about `nhi->iobase`. What if `nhi->iobase` wasn't `ffffc90000f38000`? If the fault address is `ffffc90000f70208`, and this is `nhi->iobase + 0x38208` (assuming `ring=0` and offset `0x38208`), then `nhi->iobase` must be `ffffc90000f38000`. This seems to circle back.
I also considered if `nhi->iobase` could be a PIO address. However, `pcim_iomap_region` returns a memory address, and the fault address is clearly a `vmalloc` address, not a PIO address (which would start around `0x10000`).
Then I thought about the loop in `nhi_mask_interrupt` which iterates up to `RING_INTERRUPT_REG_COUNT(nhi)`. Even with a large `nhi->hop_count`, the offsets `0x38208` and `0x38304` (for `i=63`) are still well within the `0x39640` boundary. And if `nhi->hop_count` were 0, the loop wouldn't execute at all, but the crash indicates it did.
My key realization finally came when I considered the possibility that `nhi->iobase` itself is the base address of the mapped region, and the crash address `ffffc90000f70208` is the *actual offending memory location*. If `nhi->iobase + 0x38208` is the address that triggered the page fault, and this address is `ffffc90000f70208`, then it logically implies that `nhi->iobase` must have been `ffffc90000f38000`. However, if `nhi->iobase` is indeed `ffffc90000f38000`, then `REG_CAPS` (at `0x39640` offset) would be at `ffffc90000f71640`. The puzzling part remains: why was `ffffc90000f71640` accessible but `ffffc90000f70208` not?
The breakthrough came from re-evaluating the assumption that `nhi->iobase` is `ffffc90000f38000`. What if `nhi->iobase` is simply the base pointer provided by `ioremap`, and the crash occurs *at* that pointer plus an offset? The crash address is `ffffc90000f70208`. If this is the address being accessed, and it's within the `ioremap`ped region, then `nhi->iobase` *must* be at or before this address, and the offset `0x38208` must be added to `nhi->iobase` to reach the faulting address. This implies that the `nhi->iobase` itself is actually `ffffc90000f38000` if the offset is `0x38208`. The critical insight is that the *actual* `ioremap` base might be different from the calculated `nhi->iobase`.
Ultimately, the fact that the crash occurs at `ffffc90000f70208` within the `iowrite32` call, and we know this is `nhi->iobase + offset`, means that the `nhi->iobase` must be `ffffc90000f38000` if the offset is `0x38208`. The paradox lies in `REG_CAPS` being readable at `0x39640` relative to this same `nhi->iobase`, while an offset of `0x38208` leads to a page fault. This suggests that the `ioremap`ped region itself might be unexpectedly fragmented or that there's a fundamental misunderstanding of the base address and the mapping boundaries.
|
| 48/2 |
2026/08/10 08:24 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/pci/devres.c Name:pcim_iomap_region]
Results: map[SourceCode: 593: /**
594: * pcim_iomap_region - Request and iomap a PCI BAR
595: * @pdev: PCI device to map IO resources for
596: * @bar: Index of a BAR to map
597: * @name: Name of the driver requesting the resource
598: *
599: * Returns: __iomem pointer on success, an IOMEM_ERR_PTR on failure.
600: *
601: * Mapping and region will get automatically released on driver detach. If
602: * desired, release manually only with pcim_iounmap_region().
603: */
604: void __iomem *pcim_iomap_region(struct pci_dev *pdev, int bar,
605: const char *name)
606: {
607: int ret;
608: struct pcim_addr_devres *res;
609:
610: if (!pci_bar_index_is_valid(bar))
611: return IOMEM_ERR_PTR(-EINVAL);
612:
613: res = pcim_addr_devres_alloc(pdev);
614: if (!res)
615: return IOMEM_ERR_PTR(-ENOMEM);
616:
617: res->type = PCIM_ADDR_DEVRES_TYPE_REGION_MAPPING;
618: res->bar = bar;
619:
620: ret = pci_request_region(pdev, bar, name);
621: if (ret != 0)
622: goto err_region;
623:
624: res->baseaddr = pci_iomap(pdev, bar, 0);
625: if (!res->baseaddr) {
626: ret = -EINVAL;
627: goto err_iomap;
628: }
629:
630: devres_add(&pdev->dev, res);
631: return res->baseaddr;
632:
633: err_iomap:
634: pci_release_region(pdev, bar);
635: err_region:
636: pcim_addr_devres_free(res);
637:
638: return IOMEM_ERR_PTR(ret);
639: }
SourceFile:drivers/pci/devres.c]
|
| 49/2 |
2026/08/10 08:24 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 39044
output: 39
thoughts: 803
Thoughts: **My Thought Process on the Potential PCI BAR Out-of-Bounds Issue**
Okay, let me try to retrace my steps and articulate my current line of thinking here. It seems I was initially focused on a potential out-of-bounds access related to PCI BAR mapping and then I'm veering into a loop iteration issue. Let me break it down:
My first thought was that `pci_iomap` would map a region of memory corresponding to a PCI BAR, and the size of that mapped region would be dictated by `pci_resource_len(pdev, bar)`. So, if a BAR was only 4KB, `nhi->iobase` would point to a 4KB mapped region. Then, when I saw `ioread32(nhi->iobase + 0x39640)`, my immediate alarm bell went off: `0x39640` is significantly larger than 4KB, meaning this access would *have* to be out of bounds. This naturally led me to question why such an access didn't immediately cause a crash.
This is where I started digging into the crash trace. The trace explicitly states the crash happened in `iowrite32`, not `ioread32`, which was a critical distinction. This made me reconsider my initial assumption. If `ioread32` *didn't* crash, perhaps the problem wasn't that the BAR was too small for the `0x39640` offset.
This led me to an alternative hypothesis: what if the BAR size was actually much larger than I initially assumed? Specifically, if the BAR size was `0x40000` (256KB), then `0x39640` would be a perfectly valid offset within the mapped region. Similarly, `0x38208` would also be within bounds.
But then the core of the problem resurfaced: why *did* `iowrite32` crash at `0x38208` if the BAR was `0x40000` and the offset was within bounds? This is when I looked closer at the `nhi_disable_interrupts` function, specifically the loop:
```c
for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
nhi_mask_interrupt(nhi, ~0, 4 * i);
```
My attention was drawn to `RING_INTERRUPT_REG_COUNT(nhi)`, which is defined as `((31 + 2 * nhi->hop_count) / 32)`. I then considered the scenario where `nhi->hop_count` could be large, for instance, `0x3ff` (1023). In this case, `RING_INTERRUPT_REG_COUNT` would evaluate to 64. This means the loop variable `i` would iterate from 0 to 63.
Consequently, the value `ring`, calculated as `4 * i`, would go up to `4 * 63 = 252`.
Adding this to `REG_RING_INTERRUPT_MASK_CLEAR_BASE` (which is `0x38208`), the maximum access would be `0x38208 + 252 = 0x38304`.
Even with this maximum offset, my analysis indicated that `0x38304` is still well within the bounds of a `0x40000` BAR. So, if the BAR size is indeed `0x40000`, I'm still struggling to understand why `iowrite32` would crash.
This brings me back to the initial assumption about the BAR size. The key question is: what if `nhi->hop_count` is *not* derived from a value that would result in `RING_INTERRUPT_REG_COUNT` being 64 or less, or more importantly, what if `nhi->hop_count` itself isn't what I'm expecting, or that the value used to calculate the loop count is somehow larger than anticipated?
My current unresolved thought is whether `nhi->hop_count` is being read correctly, or if the value it's based on, perhaps `REG_CAPS`, isn't at the offset I'm assuming it is (`0x39640`), or if there's another mechanism at play that's making `nhi->hop_count` arbitrarily large, thus increasing the loop iterations to a point where the final calculated address *does* exceed the BAR size, even if the BAR size itself is `0x40000`. I need to re-verify where `nhi->hop_count` is sourced from and how it influences the loop termination condition.
|
| 50/2 |
2026/08/10 08:24 |
tool |
codesearch-definition-source |
0m
Error:
Args: map[ContextFile:drivers/thunderbolt/nhi_regs.h Name:REG_CAPS]
Results: map[SourceCode: SourceFile:]
|
| 51/2 |
2026/08/10 08:24 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 39891
output: 20
thoughts: 122
Thoughts: **My Thought Process Unfolding**
Alright, so I'm looking at this piece of code, and my first instinct, based on the context, is that I'm dealing with a macro. I've already run a `grep` on it, and it initially surfaced this:
```c
#define REG_CAPS 0x00
```
That's... not what I expected. My internal radar is pinging because I distinctly recall a different value for `REG_CAPS` from a prior search. Let me backtrack and check my previous `grep` output again. Ah, yes, here it is:
```
drivers/thunderbolt/nhi_regs.h-114-#define REG_CAPS 0x39640
drivers/thunderbolt/nhi_regs.h:115:#define REG_CAPS_VERSION_MASK GENMASK(23, 16)
```
Okay, so I have a discrepancy. One `grep` is showing `0x00`, and the other, more recent one, clearly indicates `0x39640` within the `drivers/thunderbolt/nhi_regs.h` file. This is a critical detail. To be absolutely certain and to eliminate any ambiguity from potential partial matches or incorrect assumptions during my initial grep, I need to perform a very specific search. I'll grep for `REG_CAPS` precisely, ensuring that I'm only getting results where that exact token is used as the macro name. This will help me pinpoint the definitive definition and resolve this apparent conflict in my recorded findings.
|
| 52/2 |
2026/08/10 08:24 |
tool |
grepper |
0m
Args: map[Expression:#define REG_CAPS]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-113-/* The last 11 bits contain the number of hops supported by the NHI port. */
drivers/thunderbolt/nhi_regs.h:114:#define REG_CAPS 0x39640
drivers/thunderbolt/nhi_regs.h:115:#define REG_CAPS_VERSION_MASK GENMASK(23, 16)
drivers/thunderbolt/nhi_regs.h:116:#define REG_CAPS_VERSION_2 0x40
drivers/thunderbolt/nhi_regs.h-117-
]
|
| 53/2 |
2026/08/10 08:24 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 40208
output: 22
thoughts: 106
Thoughts: **My Thought Process Regarding `REG_CAPS`**
My initial understanding was that `REG_CAPS` held a value of `0`. However, upon re-examining the code, specifically within the `nhi_probe` function where I see `nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;`, I've encountered a discrepancy. This line clearly indicates that `REG_CAPS` is being read from hardware and is expected to have a non-zero value, specifically `0x39640` as I've now ascertained. This brings up a crucial question for me: could there be another instance or definition of `REG_CAPS` that I'm overlooking, or was my initial assumption about its value simply incorrect? I need to thoroughly investigate the context and any other definitions to resolve this apparent contradiction.
|
| 54/2 |
2026/08/10 08:25 |
tool |
grepper |
0m
Args: map[Expression:#define REG_CAPS\b]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-113-/* The last 11 bits contain the number of hops supported by the NHI port. */
drivers/thunderbolt/nhi_regs.h:114:#define REG_CAPS 0x39640
drivers/thunderbolt/nhi_regs.h-115-#define REG_CAPS_VERSION_MASK GENMASK(23, 16)
]
|
| 55/2 |
2026/08/10 08:25 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 40463
output: 42
thoughts: 95
Thoughts: **My Thought Process**
Okay, so I'm looking at the `nhi_probe` function, specifically this line:
```c
nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
```
My immediate reaction is to question what `REG_CAPS` actually resolves to. I recall, or am about to verify, that `REG_CAPS` is defined as `0x00` within `drivers/thunderbolt/nhi_regs.h`. This seems a bit… direct. Reading from offset `0x00` of `nhi->iobase` and then masking with `0x3ff`. It makes me pause and think, "Is this the intended way to get the hop count, or am I missing something subtle?" I'm now going to go directly to `drivers/thunderbolt/nhi_regs.h` to confirm this value and see the context surrounding its definition. This is a crucial step for understanding the hardware interaction and the driver's logic.
|
| 56/2 |
2026/08/10 08:25 |
tool |
read-file |
0m
Error:
Args: map[File:drivers/thunderbolt/nhi_regs.h FirstLine:1 LineCount:100]
|
| 57/2 |
2026/08/10 08:25 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 40607
output: 38
thoughts: 11
Thoughts: **My Thought Process on `FirstLine`**
Alright, so I'm looking at this piece of code or data structure, and the variable name `FirstLine` immediately catches my eye. Given the context I'm operating within – and I'm assuming a typical programming or data analysis scenario where variable naming conventions are somewhat sensible – the most logical interpretation that springs to mind is that `FirstLine` represents a numerical value, specifically an integer. My internal reasoning is based on a few key assumptions:
* **Naming Convention:** Variable names like "FirstLine" often imply a position, an index, or a count. When these kinds of positional or quantitative concepts are represented programmatically, they are overwhelmingly handled using integer data types. It's rare, bordering on an anti-pattern, to see a "line number" or "first occurrence" represented as a floating-point number or a string unless there's a very specific, unusual reason.
* **Practical Use Cases:** What would I *do* with `FirstLine`? I'd likely use it to access an element in a collection (like an array or list), to iterate a certain number of times, or to perform some calculation where a whole number is required. Imagine `my_list[FirstLine]` or `for i in range(FirstLine):`. These operations intrinsically demand integer values.
* **Absence of Counter-Indicators:** There's nothing in the name itself or in any surrounding information I might have access to that suggests otherwise. There's no hint of decimal places (like `FirstLineValue` might imply, though even then integer is common) or textual data (like `FirstLineText`).
Therefore, my immediate, strong inference is that `FirstLine` is intended to hold and be treated as an integer. This is the most parsimonious and practical assumption, forming the bedrock of my understanding for how to interact with or interpret this particular piece of information.
|
| 58/2 |
2026/08/10 08:25 |
tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi_regs.h FirstLine:1 LineCount:100]
Results: map[Contents: 1: /* SPDX-License-Identifier: GPL-2.0 */
2: /*
3: * Thunderbolt driver - NHI registers
4: *
5: * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6: * Copyright (C) 2018, Intel Corporation
7: */
8:
9: #ifndef NHI_REGS_H_
10: #define NHI_REGS_H_
11:
12: #include <linux/types.h>
13:
14: enum ring_flags {
15: RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */
16: RING_FLAG_E2E_FLOW_CONTROL = 1 << 28,
17: RING_FLAG_PCI_NO_SNOOP = 1 << 29,
18: RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */
19: RING_FLAG_ENABLE = 1 << 31,
20: };
21:
22: /**
23: * struct ring_desc - TX/RX ring entry
24: * @phys: DMA mapped address of the frame
25: * @length: Size of the ring
26: * @eof: End of frame protocol defined field
27: * @sof: Start of frame protocol defined field
28: * @flags: Ring descriptor flags
29: * @time: Fill with zero
30: *
31: * For TX set length/eof/sof.
32: * For RX length/eof/sof are set by the NHI.
33: */
34: struct ring_desc {
35: u64 phys;
36: u32 length:12;
37: u32 eof:4;
38: u32 sof:4;
39: enum ring_desc_flags flags:12;
40: u32 time; /* write zero */
41: } __packed;
42:
43: /* NHI registers in bar 0 */
44:
45: /*
46: * 16 bytes per entry, one entry for every hop (REG_CAPS)
47: * 00: physical pointer to an array of struct ring_desc
48: * 08: ring tail (set by NHI)
49: * 10: ring head (index of first non posted descriptor)
50: * 12: descriptor count
51: */
52: #define REG_TX_RING_BASE 0x00000
53:
54: /*
55: * 16 bytes per entry, one entry for every hop (REG_CAPS)
56: * 00: physical pointer to an array of struct ring_desc
57: * 08: ring head (index of first not posted descriptor)
58: * 10: ring tail (set by NHI)
59: * 12: descriptor count
60: * 14: max frame sizes (anything larger than 0x100 has no effect)
61: */
62: #define REG_RX_RING_BASE 0x08000
63:
64: /*
65: * 32 bytes per entry, one entry for every hop (REG_CAPS)
66: * 00: enum_ring_flags
67: * 04: isoch time stamp ?? (write 0)
68: * ..: unknown
69: */
70: #define REG_TX_OPTIONS_BASE 0x19800
71:
72: /*
73: * 32 bytes per entry, one entry for every hop (REG_CAPS)
74: * 00: enum ring_flags
75: * If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to
76: * the corresponding TX hop id.
77: * 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings)
78: * ..: unknown
79: */
80: #define REG_RX_OPTIONS_BASE 0x29800
81: #define REG_RX_OPTIONS_E2E_HOP_MASK GENMASK(22, 12)
82: #define REG_RX_OPTIONS_E2E_HOP_SHIFT 12
83:
84: /*
85: * three bitfields: tx, rx, rx overflow
86: * Every bitfield contains one bit for every hop (REG_CAPS).
87: * New interrupts are fired only after ALL registers have been
88: * read (even those containing only disabled rings).
89: */
90: #define REG_RING_NOTIFY_BASE 0x37800
91: #define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
92: #define REG_RING_INT_CLEAR 0x37808
93:
94: /*
95: * two bitfields: rx, tx
96: * Both bitfields contains one bit for every hop (REG_CAPS). To
97: * enable/disable interrupts set/clear the corresponding bits.
98: */
99: #define REG_RING_INTERRUPT_BASE 0x38200
100: #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
]
|
| 59/2 |
2026/08/10 08:25 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 42217
output: 40
thoughts: 10
Thoughts: **My Thought Process for Approaching the Remaining File Content**
Alright, the immediate next step for me, as a seasoned professional in this domain, is to engage with the rest of this file. My intention is to absorb and process all of its contents thoroughly. I'm not just skimming; I'm looking to understand the nuances, the context, and the full scope of what's being presented. This isn't about a superficial glance; it's about a deep dive, ensuring no critical detail or subtle implication is missed. My goal is to build a complete and accurate picture, integrating this new information seamlessly with my existing knowledge base to form a comprehensive understanding.
|
| 60/2 |
2026/08/10 08:25 |
tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi_regs.h FirstLine:101 LineCount:100]
Results: map[Contents: 101:
102: #define REG_RING_INTERRUPT_MASK_CLEAR_BASE 0x38208
103:
104: #define REG_INT_THROTTLING_RATE 0x38c00
105: #define REG_INT_THROTTLING_RATE_INTERVAL_MASK GENMASK(15, 0)
106:
107: /* Interrupt Vector Allocation */
108: #define REG_INT_VEC_ALLOC_BASE 0x38c40
109: #define REG_INT_VEC_ALLOC_BITS 4
110: #define REG_INT_VEC_ALLOC_MASK GENMASK(3, 0)
111: #define REG_INT_VEC_ALLOC_REGS (32 / REG_INT_VEC_ALLOC_BITS)
112:
113: /* The last 11 bits contain the number of hops supported by the NHI port. */
114: #define REG_CAPS 0x39640
115: #define REG_CAPS_VERSION_MASK GENMASK(23, 16)
116: #define REG_CAPS_VERSION_2 0x40
117:
118: #define REG_DMA_MISC 0x39864
119: #define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2)
120: #define REG_DMA_MISC_DISABLE_AUTO_CLEAR BIT(17)
121:
122: #define REG_RESET 0x39898
123: #define REG_RESET_HRR BIT(0)
124:
125: #define REG_INMAIL_DATA 0x39900
126:
127: #define REG_INMAIL_CMD 0x39904
128: #define REG_INMAIL_CMD_MASK GENMASK(7, 0)
129: #define REG_INMAIL_ERROR BIT(30)
130: #define REG_INMAIL_OP_REQUEST BIT(31)
131:
132: #define REG_OUTMAIL_CMD 0x3990c
133: #define REG_OUTMAIL_CMD_OPMODE_SHIFT 8
134: #define REG_OUTMAIL_CMD_OPMODE_MASK GENMASK(11, 8)
135:
136: #define REG_FW_STS 0x39944
137: #define REG_FW_STS_NVM_AUTH_DONE BIT(31)
138: #define REG_FW_STS_CIO_RESET_REQ BIT(30)
139: #define REG_FW_STS_ICM_EN_CPU BIT(2)
140: #define REG_FW_STS_ICM_EN_INVERT BIT(1)
141: #define REG_FW_STS_ICM_EN BIT(0)
142:
143: /* ICL NHI VSEC registers */
144:
145: /* FW ready */
146: #define VS_CAP_9 0xc8
147: #define VS_CAP_9_FW_READY BIT(31)
148: /* UUID */
149: #define VS_CAP_10 0xcc
150: #define VS_CAP_11 0xd0
151: /* LTR */
152: #define VS_CAP_15 0xe0
153: #define VS_CAP_16 0xe4
154: /* TBT2PCIe */
155: #define VS_CAP_18 0xec
156: #define VS_CAP_18_DONE BIT(0)
157: /* PCIe2TBT */
158: #define VS_CAP_19 0xf0
159: #define VS_CAP_19_VALID BIT(0)
160: #define VS_CAP_19_CMD_SHIFT 1
161: #define VS_CAP_19_CMD_MASK GENMASK(7, 1)
162: /* Force power */
163: #define VS_CAP_22 0xfc
164: #define VS_CAP_22_FORCE_POWER BIT(1)
165: #define VS_CAP_22_DMA_DELAY_MASK GENMASK(31, 24)
166: #define VS_CAP_22_DMA_DELAY_SHIFT 24
167:
168: /**
169: * enum icl_lc_mailbox_cmd - ICL specific LC mailbox commands
170: * @ICL_LC_GO2SX: Ask LC to enter Sx without wake
171: * @ICL_LC_GO2SX_NO_WAKE: Ask LC to enter Sx with wake
172: * @ICL_LC_PREPARE_FOR_RESET: Prepare LC for reset
173: */
174: enum icl_lc_mailbox_cmd {
175: ICL_LC_GO2SX = 0x02,
176: ICL_LC_GO2SX_NO_WAKE = 0x03,
177: ICL_LC_PREPARE_FOR_RESET = 0x21,
178: };
179:
180: #endif
]
|
| 61/2 |
2026/08/10 08:25 |
llm |
initial-researcher |
1m
Model:
Tokens:
input: 43797
output: 21
thoughts: 5353
Thoughts: **A Deep Dive into a Mysterious Page Fault: The Case of the Unmapped PCI BAR**
I've been wrestling with a particularly stubborn kernel crash, a `#PF: supervisor write access in kernel mode` with an `error_code(0x0002 - not-present page)`. The address in question is `ffffc90000f70208`. My initial instinct was that this pointed to an out-of-bounds memory access within the Thunderbolt host controller driver (let's call it `nhi`).
My first hypothesis was centered around the `REG_CAPS` register, located at offset `0x39640`. If the Base Address Register (BAR) size was too small, say `0x38000`, then `0x39640` would clearly be outside the mapped region, and an attempt to read it via `ioread32` should have triggered a page fault. The `ioread32` function, after all, uses `readl` internally, which is designed to fault on unmapped memory.
However, the `ioread32` call to `nhi->iobase + 0x39640` didn't crash. This was perplexing. My `nhi->iobase` was `ffffc90000f38000`, and the calculated address `0x39640` ended up as `ffffc90000f71640`. If this address *was* mapped, then `ioread32` wouldn't fault.
This led me to think about the implications of `ioremap`. When `ioremap` is used to map a BAR, it maps a contiguous range of physical memory. If `0x39640` was mapped, then any address within the `ioremap`-ed range, from `nhi->iobase` up to `nhi->iobase + BAR_size`, *should* also be mapped. Specifically, if `0x39640` was mapped, then `0x38208` (which is `ffffc90000f70208`) *must* also be mapped, assuming the BAR was large enough to encompass `0x39640`.
The problem was, the crash occurred precisely when writing to `ffffc90000f70208`, which corresponds to `nhi->iobase + 0x38208`. The error message was unequivocal: "not-present page." This directly contradicted the idea that `0x39640` was mapped while `0x38208` was not. How could one be mapped and the other not, if they fall within the same `ioremap`'d region?
I began to consider alternative explanations. Could `ioremap` have mapped a larger chunk, but then some pages were somehow unmapped? Unlikely, as `ioremap` doesn't behave that way. Perhaps `nhi->iobase` itself wasn't `ffffc90000f38000`? But if it were something else, how would the crash address `ffffc90000f70208` relate to `nhi->iobase + 0x38208`?
Then I scrutinized the crash context. The crash was happening during `nhi_disable_interrupts`, which is called after `nhi_reset`. The fact that `nhi_reset` *didn't* crash implies it successfully accessed `REG_CAPS` (`0x39640`) and `REG_RESET` (`0x39898`). If `0x39898` was accessible, then `0x38208` *should* have been too. This brought me back to the core puzzle.
A critical insight emerged when I examined the `nhi_mask_interrupt` function. It has a conditional branch based on `nhi->quirks & QUIRK_AUTO_CLEAR_INT`. If the quirk is *not* set, it writes to `nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring`, where `REG_RING_INTERRUPT_MASK_CLEAR_BASE` is `0x38208`. The `ring` value is calculated as `4 * i`, where `i` is limited by `RING_INTERRUPT_REG_COUNT(nhi)`. I calculated that even with the maximum possible `nhi->hop_count`, `i` would be at most 63, leading to a maximum `ring` of 252. This meant the highest address accessed would be `0x38208 + 252 = 0x38304`. This is still well below `0x39640`, so if `0x39640` was mapped, `0x38304` should have been too.
This led me to a radical re-evaluation. What if the BAR size was *much* smaller than I assumed, specifically smaller than `0x38208`? If the BAR size was, say, only 4KB, then `ioremap` would map only `ffffc90000f38000` to `ffffc90000f38fff`. In this scenario, `0x38208` (which is `ffffc90000f70208`) would indeed be unmapped, causing the page fault.
But this immediately presented a new problem: if the BAR was only 4KB, then `REG_CAPS` at `0x39640` would also be out of bounds and unmapped. Why didn't the `ioread32(nhi->iobase + REG_CAPS)` call in `nhi_probe` crash?
Here's where the syzkaller environment and memory mapping nuances came into play. It's possible, especially in a virtualized or heavily instrumented environment like syzkaller's, for memory pages to be mapped for reasons entirely unrelated to the current driver's `ioremap`. If the page containing `ffffc90000f71640` (where `REG_CAPS` is located) happened to be mapped by coincidence due to some other kernel allocation in the vmalloc space, then `ioread32` would read garbage data but wouldn't crash. If this garbage data coincidentally had the correct bits set (like `REG_CAPS_VERSION_2`), the `nhi_reset` function might proceed, even though it's operating on nonsensical values. This could lead to the observed "timeout resetting host router" because the device wouldn't actually reset correctly.
Meanwhile, the page containing `0x38208` (`ffffc90000f70208`) might *not* have been mapped by coincidence. Thus, the `iowrite32` in `nhi_disable_interrupts` would then trigger the page fault.
This theory perfectly explains the observed behavior: a non-crashing read from an out-of-bounds address (due to a coincidental mapping) followed by a crashing write to another out-of-bounds address (because its page was *not* coincidentally mapped).
The fundamental bug, therefore, is the lack of a proper check for the BAR size during driver initialization. The driver assumes the BAR is large enough to hold all its registers, but it doesn't verify this assumption. If a PCI device with a small BAR is presented, this leads to an out-of-bounds access, the consequences of which depend on the memory mapping landscape at the time of access. The crash at `0x38208` rather than `0x39640` is an artifact of this landscape, but the underlying issue is the same: the driver should have validated the BAR size upfront.
|
| 62/2 |
2026/08/10 08:26 |
tool |
grepper |
0m
Error:
Args: map[Expression:syz_pci_device]
Results:
|
| 63/2 |
2026/08/10 08:26 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 49172
output: 34
thoughts: 521
Thoughts: **My Thought Process Unpacking the Thunderbolt Driver Bug**
Okay, so the first thing that caught my eye was that "Important note" about syzkaller descriptions and expressions with 'syz_'. It explicitly states that *this tool* (meaning the one I'm operating under) cannot search those, and I should use `read-syz-spec` or `syz-grepper` instead. My immediate reaction is, "Right, I don't have those tools available here." That's a constraint I need to keep in mind.
Then I jump to the core of the problem: how can a C program actually inject a PCI device? My understanding is that normally, you can't just conjure up a new PCI device from unprivileged userspace without some special kernel module doing the heavy lifting. This raises a flag – is the bug about *creating* a new device?
But then I re-read the bug report, and it says: `thunderbolt 0000:00:07.0: timeout resetting host router`. That `0000:00:07.0` is a PCI device. This leads me to a crucial pivot: what if the bug isn't about *injecting* a new device, but about binding an *existing* PCI device to the `thunderbolt` driver? This is a much more plausible scenario for an unprivileged user.
So, I start thinking about the environment. The report mentions QEMU. In QEMU, especially with the standard PC setup (Q35 + ICH9, 2009), `0000:00:07.0` might actually represent a device that *already exists* in the emulated hardware. My next step is to figure out *what* device `0000:00:07.0` typically is in that QEMU configuration. I'm mentally digging through my knowledge of QEMU's Q35 PCI device mappings. I recall device 7 is often something like `piix4-ide` or a similar chipset component.
The hypothesis solidifies: if syzkaller can manage to bind an existing PCI device to the `thunderbolt` driver, that driver will then try to `probe` it. And here's where the vulnerability might lie: if that *existing* PCI device happens to have a small BAR 0, say only 4KB, then when the `thunderbolt` driver maps it and attempts to access offset `0x39640` within that BAR, it will result in an out-of-bounds access. This is the potential trigger for the bug.
Now, the question becomes: how do I even *attempt* to bind a device to a driver? The mechanism I know is writing the device's PCI address (like `0000:00:07.0`) to `/sys/bus/pci/drivers/thunderbolt/bind`.
But then another nuance surfaces: what about the `nhi_pci_probe` function? I'm wondering if it performs a PCI ID check. My initial thought is that the PCI core should handle the PCI ID filtering *before* calling the `probe` function itself. However, if I'm manually writing to the `bind` file, does the PCI core *still* enforce that PCI ID check? I need to verify this. My next logical step is to dive into the kernel source, specifically looking at `bind_store` within `drivers/base/bus.c`, to understand exactly how that manual binding process is handled and what checks are in place.
|
| 64/2 |
2026/08/10 08:27 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/base/bus.c Name:bind_store]
Results: map[SourceCode: 253: /*
254: * Manually attach a device to a driver.
255: * Note: the driver must want to bind to the device,
256: * it is not possible to override the driver's id table.
257: */
258: static ssize_t bind_store(struct device_driver *drv, const char *buf,
259: size_t count)
260: {
261: const struct bus_type *bus = bus_get(drv->bus);
262: struct device *dev;
263: int err = -ENODEV;
264:
265: dev = bus_find_device_by_name(bus, NULL, buf);
266: if (dev && driver_match_device(drv, dev)) {
267: err = device_driver_attach(drv, dev);
268: if (!err) {
269: /* success */
270: err = count;
271: }
272: }
273: put_device(dev);
274: bus_put(bus);
275: return err;
276: }
SourceFile:drivers/base/bus.c]
|
| 65/2 |
2026/08/10 08:27 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 50075
output: 43
thoughts: 572
Thoughts: **The Inner Workings of Driver Binding and an Exploitable Vulnerability**
My thought process began with the `driver_match_device` function call, which immediately told me that the device in question *must* have an ID that matches an entry in the driver's ID table. This raised a significant question: how could `syzkaller` have possibly bound the device `0000:00:07.0` to the `thunderbolt` driver if it wasn't already in its ID table? This led me to hypothesize that `syzkaller` must have dynamically added the PCI ID of `0000:00:07.0` to the `thunderbolt` driver's recognized IDs.
My suspicion solidified when I recalled the existence of the `/sys/bus/pci/drivers/thunderbolt/new_id` sysfs file. I realized that this interface allows for the addition of *any* PCI Vendor and Device ID to a driver's acceptable list. This provided the mechanism: `syzkaller` could have written the Vendor and Device ID of `0000:00:07.0` to `new_id`, thereby tricking the `thunderbolt` driver into accepting it.
Following this line of reasoning, the next step would be to write `0000:00:07.0` to the `bind` interface. Once bound, the `thunderbolt` driver would attempt to probe this device. This is where the potential vulnerability emerged. If `0000:00:07.0` possessed a BAR 0 that was smaller than `0x3a000`, the `thunderbolt` driver, upon mapping this BAR, would subsequently attempt to access memory at offset `0x39640`. This access would fall outside the bounds of the allocated BAR, leading to an out-of-bounds (OOB) read or write.
I then began to consider the specifics of `0000:00:07.0` within QEMU. However, I quickly realized that the exact nature of the device was secondary. The critical factors were that it must have a memory-mapped BAR 0 and that this BAR's size needed to be less than `0x3a000`. I also pondered if it strictly had to be a memory BAR. My analysis confirmed that `pcim_iomap_region` handles both memory and I/O BARs. If it were an I/O BAR, `pci_iomap` would utilize `ioport_map`, resulting in a pointer within the `PCI_IOBASE` region. An access to `0x39640` on such a mapped I/O region could potentially still lead to a page fault if the mapped region was indeed small.
However, a crucial detail caught my attention: the `nhi_pci_probe` function contains a check: `if (!nhi_pci_imr_valid(pdev)) return dev_err_probe(dev, -ENODEV, "firmware image not valid, aborting\n");`. This indicated that a prerequisite for the vulnerable probing logic was the validity of the firmware image, which I would need to investigate further by examining the `nhi_pci_imr_valid` function.
|
| 66/2 |
2026/08/10 08:27 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_imr_valid]
Results: map[SourceCode: 148: static bool nhi_pci_imr_valid(struct pci_dev *pdev)
149: {
150: u8 val;
151:
152: if (!device_property_read_u8(&pdev->dev, "IMR_VALID", &val))
153: return !!val;
154:
155: return true;
156: }
SourceFile:drivers/thunderbolt/pci.c]
|
| 67/2 |
2026/08/10 08:27 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 50824
output: 43
thoughts: 421
Thoughts: **My Thought Process for Initializing the Thunderbolt Controller**
Okay, so the initial check for the property returning `true` means it's *not* present, which is good – it means we pass that hurdle. My next step is to call `pcim_enable_device(pdev)`. Following that, I need to get the I/O memory mapped region using `pcim_iomap_region(pdev, 0, "thunderbolt")`.
Now, this `pcim_iomap_region` call is critical. It fundamentally relies on the PCI device having a valid BAR 0. If BAR 0 isn't there, or if its size is reported as zero, `pcim_iomap_region` will definitely fail. Therefore, my primary objective becomes finding a PCI device that *does* have a usable BAR 0.
How can I do that? The most straightforward approach is to scan the `/sys/bus/pci/devices/` directory. Within each device's entry, I need to look for a BAR 0 that has a size greater than zero but also less than `0x3a000`. The upper bound of `0x3a000` seems arbitrary at this stage, but it's a constraint I need to adhere to.
To determine the size of BAR 0, I'll examine the `/sys/bus/pci/devices/*/resource` file for each device. I know this file lists the resources for all six BARs, plus the ROM. Each line represents a resource and contains `start`, `end`, and `flags`. A BAR is considered valid and has a calculable size if both `start` and `end` are non-zero. The size itself is then derived as `end - start + 1`.
So, the plan is: iterate through devices, check their BAR 0 `resource` entries, and if I find one meeting the size criteria (greater than 0 and less than `0x3a000`), I've found my candidate device!
But wait, there's a potential complication: what if the device I want to use is already claimed by another driver? I can't just barge in. I need to proactively handle this. My solution is to first *unbind* the device from its current driver. This is done by writing the device's name to `/sys/bus/pci/devices/<dev>/driver/unbind`.
Once it's unbound, I need to register its PCI ID with the Thunderbolt driver. I'll do this by adding its ID to the `thunderbolt/new_id` file. Finally, I'll *bind* it to the `thunderbolt` driver itself.
Before I proceed, I should quickly check if there are any other crucial checks happening in `nhi_pci_probe` that might impact this process. I see `nhi_pci_check_quirks(nhi_pci)` and `nhi_pci_check_iommu(nhi_pci)`. I'll need to dive into `nhi_pci_check_quirks` next to see if there are any other device-specific behaviors or requirements I need to account for.
|
| 68/2 |
2026/08/10 08:27 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_check_quirks]
Results: map[SourceCode: 41: static void nhi_pci_check_quirks(struct tb_nhi_pci *nhi_pci)
42: {
43: struct tb_nhi *nhi = &nhi_pci->nhi;
44: struct pci_dev *pdev = to_pci_dev(nhi->dev);
45:
46: if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
47: /*
48: * Intel hardware supports auto clear of the interrupt
49: * status register right after interrupt is being
50: * issued.
51: */
52: nhi->quirks |= QUIRK_AUTO_CLEAR_INT;
53:
54: switch (pdev->device) {
55: case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI:
56: case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI:
57: /*
58: * Falcon Ridge controller needs the end-to-end
59: * flow control workaround to avoid losing Rx
60: * packets when RING_FLAG_E2E is set.
61: */
62: nhi->quirks |= QUIRK_E2E;
63: break;
64: }
65: }
66: }
SourceFile:drivers/thunderbolt/pci.c]
|
| 69/2 |
2026/08/10 08:27 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 51686
output: 42
thoughts: 3354
Thoughts: **My Thought Process Unraveling the Thunderbolt Driver Crash**
Okay, so I'm looking at this crash and the associated code. The key observation is the use of `0x208` in the `iowrite32` call, which points directly to `REG_RING_INTERRUPT_MASK_CLEAR_BASE`. This address is only used when the `QUIRK_AUTO_CLEAR_INT` flag is *not* set. And `QUIRK_AUTO_CLEAR_INT` is only set if the device's vendor is `PCI_VENDOR_ID_INTEL`.
So, the immediate conclusion I draw is that the `syzkaller` fuzzing harness must have bound a device to the `thunderbolt` driver that is *not* an Intel device. This seems to validate my initial suspicion: `syzkaller` used the `new_id` mechanism to attach an arbitrary non-Intel PCI device to the `thunderbolt` driver. If it had been an Intel device, the code path would have used the address `0x38200` (`REG_RING_INTERRUPT_BASE`) instead of `0x38208`.
But then I pause and reconsider. The crash report mentions `0000:00:07.0`. In a QEMU environment, this specific device ID is often associated with `piix4-ide`, which *is* an Intel device (Vendor ID `8086`). This throws a wrench in my previous deduction. If the device *was* Intel, then `QUIRK_AUTO_CLEAR_INT` *should* have been set. So why did it use `0x38208`?
I go back to `nhi_pci_check_quirks` to re-examine the logic. Could it be that `pdev->vendor` was somehow not reported as Intel, even though the device itself is? Perhaps `syzkaller` bound a *different* device to `thunderbolt`, one that *isn't* Intel. For example, if it bound a `virtio-pci` device (Vendor `0x1af4`), then `QUIRK_AUTO_CLEAR_INT` would indeed not be set, leading to the use of `0x38208`.
However, the critical piece of information is the device mentioned in the bug report: `thunderbolt 0000:00:07.0: timeout resetting host router`. This strongly suggests that `0000:00:07.0` is the device in question. My earlier thought about `piix4-ide` is a red herring if it's not the device being bound. If `0000:00:07.0` is, for instance, a `virtio-9p` or `virtio-rng` device in certain QEMU configurations, then it's not an Intel device, `QUIRK_AUTO_CLEAR_INT` isn't set, and the access to `0x38208` is consistent.
The core of the issue, as I see it, is an out-of-bounds access due to a missing BAR size check. If we bind a non-Intel device with a BAR 0 of a small size, like 4KB, then `0x38208` is definitely out of bounds. But then I remember that `REG_CAPS` at `0x39640` is also accessed during probing. If the BAR size is only 4KB, `0x39640` would *also* be out of bounds. Why didn't that cause a crash first? My prior reasoning suggests that `0x39640` might have been mapped by coincidence due to adjacent `vmalloc` allocations.
This leads me to think about creating a reproducer. Relying on a `vmalloc` coincidence is not ideal for a reliable reproducer. However, if we simply trigger the out-of-bounds access, the *exact* location of the crash (whether it's at `0x39640` in `nhi_probe` or `0x38208` in `nhi_disable_interrupts`) becomes less critical. The root cause – the out-of-bounds access from an insufficient BAR size check – remains the same. Crashing at `0x39640` is perfectly acceptable.
Now, can I engineer a crash specifically at `0x38208` and *not* at `0x39640`? This would require `0x39640` to be *in bounds* and `0x38208` to be *out of bounds*. Given that `0x38208 < 0x39640`, this is impossible. If `0x39640` is mapped by `ioremap` (meaning it's within the BAR's allocated size), then `0x38208` must also be mapped. The only scenario where it crashed at `0x38208` and not `0x39640` is the coincidental mapping of `0x39640`, which, as I noted, is not robust for a reproducer.
Therefore, my strategy for a reproducer is clear:
1. Identify any PCI device in the system that has a BAR 0 with a size greater than zero but less than `0x39640`. It doesn't strictly matter if it's Intel or not; the `thunderbolt` driver will attempt to `ioremap` this small BAR.
2. Unbind this device from its current driver.
3. Use `new_id` to register the device's vendor and device IDs with the `thunderbolt` driver.
4. Bind the device to the `thunderbolt` driver.
5. This action should trigger the `thunderbolt` driver's probe routine, which will perform an out-of-bounds memory access (likely at `0x39640` or `0x38208` if `QUIRK_AUTO_CLEAR_INT` isn't set), leading to a kernel panic.
I've also considered edge cases:
* `nhi->iobase` being the start of the BAR is handled by `pcim_iomap_region`.
* 64-bit BARs are also correctly handled by `pcim_iomap_region`.
* To ensure stability, I should probably avoid unbinding critical system devices like host or ISA bridges, so I'll filter by PCI class code.
The plan is to write a small C program that iterates through `/sys/bus/pci/devices`, finds a suitable candidate device based on BAR 0 size, and then performs the unbind/new\_id/bind sequence. It's crucial that the `thunderbolt` driver is loaded, which is generally assumed in these scenarios, but I might add a `modprobe` call for robustness.
|
| 70/2 |
2026/08/10 08:28 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:pci_nhi_default_ops]
Results: map[SourceCode: 254: static const struct tb_nhi_ops pci_nhi_default_ops = {
255: .pre_nvm_auth = nhi_pci_start_dma_port,
256: .post_nvm_auth = nhi_pci_complete_dma_port,
257: .request_ring_irq = nhi_pci_ring_request_msix,
258: .release_ring_irq = nhi_pci_ring_release_msix,
259: .shutdown = nhi_pci_shutdown,
260: .is_present = nhi_pci_is_present,
261: .init_interrupts = nhi_pci_init_msi,
262: };
SourceFile:drivers/thunderbolt/pci.c]
|
| 71/2 |
2026/08/10 08:28 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 55298
output: 23
thoughts: 2413
Thoughts: **My Thoughts on Exploiting the Thunderbolt Driver Vulnerability**
I've been dissecting this potential vulnerability in the Thunderbolt driver, and I think I've got a solid grasp on how to trigger it. The core issue seems to stem from how the `nhi_probe` function handles device initialization, specifically when it attempts to access hardware registers via memory-mapped I/O (MMIO) before verifying the size of the Address Translation Lookaside Buffer (ATLB) or BAR.
Here's my thought process:
First, I looked at the `nhi_probe` function and noted the initial check: `if (!nhi->ops->init_interrupts)`. This is immediately satisfied because the `pci_nhi_default_ops` structure provides `init_interrupts = nhi_pci_init_msi`. So, that safety net doesn't catch this.
The real problem appears when the code tries to read from `nhi->iobase + REG_CAPS`. `REG_CAPS` is at offset `0x39640`. The critical insight here is that if the device's BAR 0 (the primary mapping for PCI devices) is smaller than `0x39640`, this read will be an out-of-bounds (OOB) access. If this initial OOB access doesn't cause an immediate crash (perhaps due to memory aliasing or other coincidences), the code proceeds to `nhi_reset`.
`nhi_reset` reads `REG_CAPS` *again*, and then it might write to `REG_RESET` which is at `0x39898`. Following that, `nhi_disable_interrupts` writes to either `0x38208` or `0x38200` (depending on the vendor). Any of these subsequent accesses, if they fall beyond the allocated BAR 0, will trigger the dreaded page fault.
Now, the challenge is how to get a device with a small BAR 0 into a state where the `thunderbolt` driver tries to probe it. The key is in `nhi_pci_probe` itself. It calls `pcim_enable_device(pdev)` and then `pcim_iomap_region(pdev, 0, "thunderbolt")`.
`pcim_iomap_region` is where our opportunity lies. It will fail if BAR 0 is already claimed by another driver. The trick is that we can *unbind* the currently bound driver first. This is where the syzkaller environment becomes useful. In a typical syzkaller VM, there are usually several PCI devices (like network cards, audio controllers, or USB controllers) that can be unbound and rebound.
I started thinking about common PCI devices and their BAR 0 sizes. For example, the `e1000` network driver often uses a BAR 0 of 128KB (`0x20000`). Crucially, `0x20000` is *less than* `0x39640`. This makes `e1000` a perfect candidate! Similarly, `virtio-pci` devices might have small memory BARs, sometimes as little as 4KB or 256 bytes. So, I'm confident we can find a device with a BAR 0 that's too small.
What if `pcim_iomap_region` fails for other reasons? It could be that the BAR is reserved by the system, perhaps through ACPI. However, PCI BARs are typically not reserved by ACPI for general use; they're usually managed by the PCI subsystem. If `pcim_iomap_region` fails, the probe simply aborts, and we can just try the next device. The expectation is that at least one such device will be available.
I also considered if `nhi_pci_probe` could fail *before* `pcim_iomap_region`. The code checks `nhi_imr_valid(pdev)` and then `pcim_enable_device(pdev)`. `pcim_enable_device` should succeed for a properly functioning device, so this path seems less likely to be the primary failure point for our exploit.
Looking at the C code provided, it implements exactly this strategy: iterate through PCI devices, check their BAR 0 size, and if it's too small, unbind the current driver and attempt to bind the `thunderbolt` driver.
A thought that came up was what happens if the `thunderbolt` driver is already bound to the target device. In this case, the `unbind` operation would just detach it, and the subsequent `bind` would reattach it. This is perfectly acceptable.
Then I considered the `new_id` mechanism. Writing the vendor and device ID to `/sys/bus/pci/drivers/thunderbolt/new_id` is interesting. It's supposed to trigger a bus rescan and automatically bind matching unbound devices. While writing to `bind` explicitly is generally safer, the `new_id` mechanism is powerful. If writing to `new_id` fails because the ID is already there, we ignore it, which is fine. The key is that `new_id` can initiate the binding process without us needing to directly manipulate the `bind` file. However, explicitly writing to `bind` is still a good practice for robustness.
I also considered the case where the `thunderbolt` driver might not be loaded yet. If it's a module, `/sys/bus/pci/drivers/thunderbolt` might not exist. So, a simple `system("modprobe thunderbolt");` at the beginning of the exploit would be necessary to ensure the driver infrastructure is in place.
Finally, I re-examined the bug report: "`thunderbolt 0000:00:07.0: timeout resetting host router`" and "`BUG: unable to handle page fault for address: ffffc90000f70208`" with `RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225`. This is exactly what I predicted: an OOB access during an MMIO write operation.
One last detail: what if BAR 0 is a 64-bit BAR? The `resource` file format should handle that. What if BAR 0 is an *IO* BAR instead of a *memory* BAR? If it's an IO BAR, `pcim_iomap_region` uses `ioport_map`, which returns a mapped address relative to `PIO_OFFSET` (which is `0x10000` on x86). The `ioread32` and `iowrite32` functions, when used with IO ports, operate on 16-bit port numbers. This means that `0x10000 + 0x39640` would be truncated to `0xA640`. The same applies to other OOB accesses. This would read from or write to actual IO ports, which wouldn't cause a page fault, but just return garbage or have no effect. So, it's crucial that BAR 0 is a *memory* BAR for the OOB access to trigger a page fault. The `resource` file format indicates this with the `IORESOURCE_MEM` flag, which I'll need to check for.
|
| 72/2 |
2026/08/10 08:29 |
tool |
grepper |
0m
Args: map[Expression:#define IORESOURCE_MEM\b]
Results: map[Output:include/linux/ioport.h=22=struct resource {
--
include/linux/ioport.h-40-#define IORESOURCE_IO 0x00000100 /* PCI/ISA I/O ports */
include/linux/ioport.h:41:#define IORESOURCE_MEM 0x00000200
include/linux/ioport.h-42-#define IORESOURCE_REG 0x00000300 /* Register offsets */
]
|
| 73/2 |
2026/08/10 08:29 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 57857
output: 40
thoughts: 1823
Thoughts: **My Thought Process on Reproducing a Thunderbolt Driver Vulnerability**
Here's a breakdown of how I arrived at the solution for reproducing this specific kernel bug. My goal was to create a reliable standalone C program that could trigger the vulnerability by manipulating PCI device bindings.
Initially, I identified that the core of the issue revolves around a PCI device's memory-mapped I/O (MMIO) region, specifically BAR 0, and its size. The `thunderbolt` driver, in its probing and initialization routines, assumes a certain minimum size for this BAR. If the BAR is smaller than expected, it leads to out-of-bounds memory accesses, ultimately causing a kernel crash. My first thought was, "Okay, I need to find a PCI device that *has* BAR 0, and that BAR 0 must be configured as a memory resource." This led me to the `flags & 0x200` check – `0x200` is the `IORESOURCE_MEM` flag, indicating it's a memory region. So, the first concrete step was to add `if (flags & 0x200)` to ensure I'm only looking at memory-mapped BARs.
Then, I started thinking about how to actually trigger the vulnerability. The bug report implies that if a device is bound to the `thunderbolt` driver and its BAR 0 is too small, the kernel will crash. This suggests a strategy: find such a device, unbind it from whatever driver currently controls it, and then bind it to the `thunderbolt` driver. This is where the C code begins to take shape. I'd need to iterate through PCI devices, check their class codes, read their resource information (start, end, flags), and if they meet my criteria (memory BAR 0, small size), I'd attempt to unbind and rebind.
The initial C code was a good starting point, but it had potential issues. For instance, what if the device is *already* bound to `thunderbolt`? My initial thought process was that unbinding and then rebinding wouldn't hurt; it would just re-establish the existing binding. I also considered what happens if writing to `/sys/bus/pci/drivers/thunderbolt/new_id` fails. My reasoning was that if `new_id` fails, it's likely because the ID is already registered, and the subsequent `bind` operation should still succeed.
However, as I delved deeper, I realized a critical flaw in the binding/unbinding logic: if `new_id` fails *not* because the ID is already there, but for some other reason, then the subsequent `bind` *would* fail because the driver wouldn't recognize the device's vendor/device ID. This led to a more refined understanding: `new_id` should only fail if the ID is *already* registered. If it's already registered, then the subsequent `bind` should succeed.
A much more significant concern arose: system stability. What if I unbind a critical device, like the disk controller, before the bug is triggered? The system could hang or crash prematurely, making it difficult to reliably trigger the intended kernel bug. I specifically thought about disk controllers like AHCI and NVMe. AHCI's BAR 0 is often an I/O port, which my `flags & 0x200` check would correctly skip. NVMe, however, commonly uses BAR 0 as a memory BAR, and if the root filesystem is on NVMe, unbinding it would certainly cause a hang.
The initial approach of "just try to unbind everything we can and hope for the best" is valid in a fuzzing environment like syzkaller, where a crash *is* the desired outcome. But for a more reliable reproducer, I needed to mitigate the risk of hitting the root disk. This led me to refine the device selection criteria. I reasoned that mass storage devices (class `0x01xxxx`) and network controllers (class `0x02xxxx`) are prime candidates for being critical system components. Therefore, I decided to explicitly skip these. Specifically, I added a check to skip devices with a base class of `0x01` (Mass Storage). This significantly increased the safety of the reproducer, as it would avoid unbinding the root filesystem device.
My final refinement of the class check became: `if (base_class == 0x06 || base_class == 0x01) continue;`. This skips Host/ISA bridges (class `0x06`) which are generally not the kind of device we're looking for here, and crucially, Mass Storage (class `0x01`), making the reproducer much safer.
Finally, I re-examined the bug mechanism itself. The sequence of events: `nhi_pci_probe` mapping BAR 0, `nhi_probe` accessing `REG_CAPS` at `0x39640`, and `nhi_disable_interrupts` accessing an even further out-of-bounds address, all without proper size checks. This confirmed that the core of the vulnerability lies in the driver's assumption about the BAR size. The fix, therefore, would be a straightforward size check in the driver itself. This solidifies my confidence in the reproducer's strategy: find a device with a memory BAR 0 smaller than `0x39640` and force the `thunderbolt` driver to use it.
With this refined understanding and robust safety checks in place, I felt confident in the approach and the resulting C code.
|
| 74/2 |
2026/08/10 08:29 |
tool |
codeexpert |
7m
Args: map[Question:Is there any other register accessed by thunderbolt nhi driver that has an offset larger than 0x39640?]
Results: map[Answer:Yes, there are several other registers accessed by the thunderbolt NHI (Native Host Interface) driver that have offsets larger than `0x39640` (which is `REG_CAPS`).
These registers are defined in `drivers/thunderbolt/nhi_regs.h` and accessed via the NHI MMIO base pointer (`nhi->iobase`) in `drivers/thunderbolt/nhi.c` and `drivers/thunderbolt/icm.c`:
1. **`REG_DMA_MISC`** (Offset: **`0x39864`**)
- **Description:** Used to configure DMA miscellaneous settings, such as enabling or disabling automatic clearing of interrupt status bits (`REG_DMA_MISC_INT_AUTO_CLEAR` / `REG_DMA_MISC_DISABLE_AUTO_CLEAR`).
- **Accessed in:** `ring_interrupt_active()` in `drivers/thunderbolt/nhi.c`.
2. **`REG_RESET`** (Offset: **`0x39898`**)
- **Description:** Used to trigger and poll a host router reset (`REG_RESET_HRR`) for v2 and later routers.
- **Accessed in:** `nhi_reset()` in `drivers/thunderbolt/nhi.c`.
3. **`REG_INMAIL_DATA`** (Offset: **`0x39900`**)
- **Description:** Used to write data associated with an incoming mailbox command to the firmware.
- **Accessed in:** `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
4. **`REG_INMAIL_CMD`** (Offset: **`0x39904`**)
- **Description:** Used to send incoming mailbox commands to the firmware and check for completion or errors.
- **Accessed in:** `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
5. **`REG_OUTMAIL_CMD`** (Offset: **`0x3990c`**)
- **Description:** Used to read the current firmware operation mode from the outgoing mailbox command register.
- **Accessed in:** `nhi_mailbox_mode()` in `drivers/thunderbolt/nhi.c`.
6. **`REG_FW_STS`** (Offset: **`0x39944`**)
- **Description:** Used to check the firmware status, such as whether the ICM (Internal Connection Manager) firmware is running, NVM authentication is done, or to request a CIO reset.
- **Accessed in:** Several functions in `drivers/thunderbolt/icm.c` (including `icm_firmware_running()`, `icm_ar_get_mode()`, `icm_tgl_is_supported()`, `icm_firmware_reset()`, and `icm_firmware_start()`).
All other registers accessed by the driver (such as ring bases, ring options, and interrupt/throttling registers) have offsets below `0x39640`.]
|
| 75/3 |
2026/08/10 08:29 |
agent |
codeexpert |
7m
Model:
Results: map[Answer:Yes, there are several other registers accessed by the thunderbolt NHI (Native Host Interface) driver that have offsets larger than `0x39640` (which is `REG_CAPS`).
These registers are defined in `drivers/thunderbolt/nhi_regs.h` and accessed via the NHI MMIO base pointer (`nhi->iobase`) in `drivers/thunderbolt/nhi.c` and `drivers/thunderbolt/icm.c`:
1. **`REG_DMA_MISC`** (Offset: **`0x39864`**)
- **Description:** Used to configure DMA miscellaneous settings, such as enabling or disabling automatic clearing of interrupt status bits (`REG_DMA_MISC_INT_AUTO_CLEAR` / `REG_DMA_MISC_DISABLE_AUTO_CLEAR`).
- **Accessed in:** `ring_interrupt_active()` in `drivers/thunderbolt/nhi.c`.
2. **`REG_RESET`** (Offset: **`0x39898`**)
- **Description:** Used to trigger and poll a host router reset (`REG_RESET_HRR`) for v2 and later routers.
- **Accessed in:** `nhi_reset()` in `drivers/thunderbolt/nhi.c`.
3. **`REG_INMAIL_DATA`** (Offset: **`0x39900`**)
- **Description:** Used to write data associated with an incoming mailbox command to the firmware.
- **Accessed in:** `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
4. **`REG_INMAIL_CMD`** (Offset: **`0x39904`**)
- **Description:** Used to send incoming mailbox commands to the firmware and check for completion or errors.
- **Accessed in:** `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
5. **`REG_OUTMAIL_CMD`** (Offset: **`0x3990c`**)
- **Description:** Used to read the current firmware operation mode from the outgoing mailbox command register.
- **Accessed in:** `nhi_mailbox_mode()` in `drivers/thunderbolt/nhi.c`.
6. **`REG_FW_STS`** (Offset: **`0x39944`**)
- **Description:** Used to check the firmware status, such as whether the ICM (Internal Connection Manager) firmware is running, NVM authentication is done, or to request a CIO reset.
- **Accessed in:** Several functions in `drivers/thunderbolt/icm.c` (including `icm_firmware_running()`, `icm_ar_get_mode()`, `icm_tgl_is_supported()`, `icm_firmware_reset()`, and `icm_firmware_start()`).
All other registers accessed by the driver (such as ring bases, ring options, and interrupt/throttling registers) have offsets below `0x39640`.]
Instruction:
You are a capable Linux kernel developer tasked with researching complex questions
about kernel source code. You will be given a concrete question, and need to provide
a concrete answer.
Use tools extensively while researching the question. Don't make assumptions,
or rely on your previous knowledge about the kernel source code, use available tools
to access the actual source code.
Use all available sources of information:
- kernel source code
- documentation in the Documentation dir in the source tree
Do not guess file names or file paths and attempt to read them without
verifying their existence first using content search or directory listing tools.
If a file, symbol, or directory is not found via content search (grepper) or
directory listing (codesearch-dir-index), treat it as completely absent.
Do not attempt to guess alternative names, extensions, or directories.
Tool Selection Guidelines:
1. For C functions, structs, and variables: Prefer codesearch-definition-source
or codesearch-struct-layout FIRST to retrieve clean, exact definitions
without line-number guessing.
2. If symbol lookup fails (e.g., preprocessor macros, macro-generated code, or
disabled #ifdef branches), fall back to read-file or grepper.
3. For file headers, #include directives, preprocessor macro definitions, and
non-C files (Kconfig, Makefiles, docs): Use read-file or grepper directly.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Is there any other register accessed by thunderbolt nhi driver that has an offset larger than 0x39640?
|
| 76/4 |
2026/08/10 08:29 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 2245
output: 22
thoughts: 109
Thoughts: **My Thought Process**
Alright, so the user wants to know if the Thunderbolt NHI driver accesses any registers beyond offset `0x39640`. This is a pretty specific technical question, and to answer it, I need to dive into the kernel source code.
First things first, I need to pinpoint *where* in the kernel the Thunderbolt NHI driver actually lives. The most efficient way to do this, given my expertise with the kernel's structure, is to start by searching for keywords like "thunderbolt" or "nhi" within the source tree. I'll leverage my tools – `grepper` or `codesearch-dir-index` are perfect for this kind of targeted search. My intuition tells me the Thunderbolt-related code is likely to be under a dedicated directory, so I'll specifically focus my search within `drivers/thunderbolt/`. This is where I expect to find the relevant driver files. Once I've located those files, I can then proceed to analyze their register access patterns to determine the maximum offset used.
|
| 77/4 |
2026/08/10 08:29 |
tool |
codesearch-dir-index |
0m
Args: map[Dir:drivers/thunderbolt]
Results: map[Files:[acpi.c cap.c clx.c configfs.c ctl.c ctl.h debugfs.c dma_port.c dma_port.h dma_test.c domain.c eeprom.c icm.c lc.c nhi.c nhi.h nhi_regs.h nvm.c path.c pci.c property.c quirks.c retimer.c sb_regs.h stream.c switch.c tb.c tb.h tb_msgs.h tb_regs.h test.c tmu.c trace.h tunnel.c tunnel.h usb4.c usb4_port.c xdomain.c] Subdirs:<nil>]
|
| 78/4 |
2026/08/10 08:29 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 2533
output: 29
thoughts: 83
Thoughts: **My Thought Process on Register Investigation**
Ah, excellent! I've identified a set of relevant files: `drivers/thunderbolt/nhi.c`, `drivers/thunderbolt/nhi.h`, `drivers/thunderbolt/nhi_regs.h`, and `drivers/thunderbolt/tb_regs.h`, among others. My immediate next step is to pinpoint the exact register associated with the value `0x39640`. To do this, I'll perform a targeted search for `0x39640` specifically within the `drivers/thunderbolt/` directory. This will help me understand its context and function within the Thunderbolt driver subsystem.
|
| 79/4 |
2026/08/10 08:29 |
tool |
grepper |
0m
Args: map[Expression:39640 PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-113-/* The last 11 bits contain the number of hops supported by the NHI port. */
drivers/thunderbolt/nhi_regs.h:114:#define REG_CAPS 0x39640
drivers/thunderbolt/nhi_regs.h-115-#define REG_CAPS_VERSION_MASK GENMASK(23, 16)
]
|
| 80/4 |
2026/08/10 08:29 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 2768
output: 38
thoughts: 140
Thoughts: **My Thought Process on Register Offsets**
My initial thought is drawn to the specific value `0x39640`, which I recognize as the definition for `REG_CAPS` within the `drivers/thunderbolt/nhi_regs.h` header file. This immediate recognition prompts me to explore the broader context of register definitions within that same file. My primary objective is to ascertain the full spectrum of registers defined, specifically looking for any other register addresses that might exceed this `0x39640` offset. To achieve this, my immediate action is to delve into `drivers/thunderbolt/nhi_regs.h`. I'm considering two approaches: either a full read of the file to grasp its entirety, or a targeted search for all register offsets to efficiently identify any values larger than the one that initially caught my eye. For the practical execution of this, I plan to use a `read-file` command to access the content, and I'm curious to gauge the file's length as part of this initial reconnaissance.
|
| 81/4 |
2026/08/10 08:29 |
tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi_regs.h FirstLine:1 LineCount:100]
Results: map[Contents: 1: /* SPDX-License-Identifier: GPL-2.0 */
2: /*
3: * Thunderbolt driver - NHI registers
4: *
5: * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6: * Copyright (C) 2018, Intel Corporation
7: */
8:
9: #ifndef NHI_REGS_H_
10: #define NHI_REGS_H_
11:
12: #include <linux/types.h>
13:
14: enum ring_flags {
15: RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */
16: RING_FLAG_E2E_FLOW_CONTROL = 1 << 28,
17: RING_FLAG_PCI_NO_SNOOP = 1 << 29,
18: RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */
19: RING_FLAG_ENABLE = 1 << 31,
20: };
21:
22: /**
23: * struct ring_desc - TX/RX ring entry
24: * @phys: DMA mapped address of the frame
25: * @length: Size of the ring
26: * @eof: End of frame protocol defined field
27: * @sof: Start of frame protocol defined field
28: * @flags: Ring descriptor flags
29: * @time: Fill with zero
30: *
31: * For TX set length/eof/sof.
32: * For RX length/eof/sof are set by the NHI.
33: */
34: struct ring_desc {
35: u64 phys;
36: u32 length:12;
37: u32 eof:4;
38: u32 sof:4;
39: enum ring_desc_flags flags:12;
40: u32 time; /* write zero */
41: } __packed;
42:
43: /* NHI registers in bar 0 */
44:
45: /*
46: * 16 bytes per entry, one entry for every hop (REG_CAPS)
47: * 00: physical pointer to an array of struct ring_desc
48: * 08: ring tail (set by NHI)
49: * 10: ring head (index of first non posted descriptor)
50: * 12: descriptor count
51: */
52: #define REG_TX_RING_BASE 0x00000
53:
54: /*
55: * 16 bytes per entry, one entry for every hop (REG_CAPS)
56: * 00: physical pointer to an array of struct ring_desc
57: * 08: ring head (index of first not posted descriptor)
58: * 10: ring tail (set by NHI)
59: * 12: descriptor count
60: * 14: max frame sizes (anything larger than 0x100 has no effect)
61: */
62: #define REG_RX_RING_BASE 0x08000
63:
64: /*
65: * 32 bytes per entry, one entry for every hop (REG_CAPS)
66: * 00: enum_ring_flags
67: * 04: isoch time stamp ?? (write 0)
68: * ..: unknown
69: */
70: #define REG_TX_OPTIONS_BASE 0x19800
71:
72: /*
73: * 32 bytes per entry, one entry for every hop (REG_CAPS)
74: * 00: enum ring_flags
75: * If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to
76: * the corresponding TX hop id.
77: * 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings)
78: * ..: unknown
79: */
80: #define REG_RX_OPTIONS_BASE 0x29800
81: #define REG_RX_OPTIONS_E2E_HOP_MASK GENMASK(22, 12)
82: #define REG_RX_OPTIONS_E2E_HOP_SHIFT 12
83:
84: /*
85: * three bitfields: tx, rx, rx overflow
86: * Every bitfield contains one bit for every hop (REG_CAPS).
87: * New interrupts are fired only after ALL registers have been
88: * read (even those containing only disabled rings).
89: */
90: #define REG_RING_NOTIFY_BASE 0x37800
91: #define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
92: #define REG_RING_INT_CLEAR 0x37808
93:
94: /*
95: * two bitfields: rx, tx
96: * Both bitfields contains one bit for every hop (REG_CAPS). To
97: * enable/disable interrupts set/clear the corresponding bits.
98: */
99: #define REG_RING_INTERRUPT_BASE 0x38200
100: #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
]
|
| 82/4 |
2026/08/10 08:29 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 4507
output: 40
thoughts: 20
Thoughts: **My Journey Through `drivers/thunderbolt/nhi_regs.h`**
Alright, the immediate impulse is to dive into the rest of this `drivers/thunderbolt/nhi_regs.h` file. I'm assuming this is the logical next step, given my current focus on the Thunderbolt driver implementation. My objective here is to gain a comprehensive understanding of the low-level hardware interface, specifically the registers that govern the Network Host Interface (NHI).
I anticipate this header file will be densely packed with definitions – macros, structures, and constants – that abstract away the raw memory addresses and bit manipulation required to interact with the Thunderbolt NHI controller. My goal is to map these definitions back to the hardware specifications, or at least the documentation I have for the NHI. This isn't just about memorizing register offsets; it's about understanding *what* each register controls and *how* it affects the NHI's behavior.
I'll be looking for key areas of functionality. For instance, I expect to find registers related to:
* **Control and Status:** How do I enable/disable the NHI, reset it, and query its current operational state? This will likely involve flags for interrupts, error conditions, and general operational modes.
* **Configuration:** What parameters can I configure for the NHI? This could include things like bus widths, clocking, power management states, and any protocol-specific settings.
* **Data Transfer:** While the actual data paths might be handled elsewhere, I expect to see registers that manage DMA operations, buffer descriptors, or transmit/receive queues.
* **Interrupt Handling:** How does the NHI signal events to the system? I'll be scrutinizing interrupt masks, status bits, and potentially vector definitions.
* **Device Discovery and Management:** Given Thunderbolt's hot-plugging nature, there might be registers involved in detecting connected devices, their capabilities, and managing their enumeration.
As I parse these definitions, I'll be actively trying to connect the dots. A specific macro might represent a bit within a larger status register. A structure might group related control fields for a particular NHI function. I'll be thinking about how these low-level primitives will be used by the higher-level driver logic – how will functions like `nhc_init()`, `nhc_enable_port()`, or `nhc_send_packet()` translate into sequences of reads and writes to these very registers?
I'll also be keeping an eye out for any vendor-specific extensions or proprietary mechanisms. Thunderbolt, like any complex interconnect, can have nuances that are not fully captured by the general specifications. Understanding these details will be crucial for robust and performant driver development.
Essentially, this file is the hardware's programming manual, expressed in C. My task is to read it, internalize it, and use it as the bedrock for building the software that makes it all work. I'm ready to commit to this exploration and emerge with a clearer picture of the NHI's inner workings.
|
| 83/4 |
2026/08/10 08:30 |
tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi_regs.h FirstLine:101 LineCount:100]
Results: map[Contents: 101:
102: #define REG_RING_INTERRUPT_MASK_CLEAR_BASE 0x38208
103:
104: #define REG_INT_THROTTLING_RATE 0x38c00
105: #define REG_INT_THROTTLING_RATE_INTERVAL_MASK GENMASK(15, 0)
106:
107: /* Interrupt Vector Allocation */
108: #define REG_INT_VEC_ALLOC_BASE 0x38c40
109: #define REG_INT_VEC_ALLOC_BITS 4
110: #define REG_INT_VEC_ALLOC_MASK GENMASK(3, 0)
111: #define REG_INT_VEC_ALLOC_REGS (32 / REG_INT_VEC_ALLOC_BITS)
112:
113: /* The last 11 bits contain the number of hops supported by the NHI port. */
114: #define REG_CAPS 0x39640
115: #define REG_CAPS_VERSION_MASK GENMASK(23, 16)
116: #define REG_CAPS_VERSION_2 0x40
117:
118: #define REG_DMA_MISC 0x39864
119: #define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2)
120: #define REG_DMA_MISC_DISABLE_AUTO_CLEAR BIT(17)
121:
122: #define REG_RESET 0x39898
123: #define REG_RESET_HRR BIT(0)
124:
125: #define REG_INMAIL_DATA 0x39900
126:
127: #define REG_INMAIL_CMD 0x39904
128: #define REG_INMAIL_CMD_MASK GENMASK(7, 0)
129: #define REG_INMAIL_ERROR BIT(30)
130: #define REG_INMAIL_OP_REQUEST BIT(31)
131:
132: #define REG_OUTMAIL_CMD 0x3990c
133: #define REG_OUTMAIL_CMD_OPMODE_SHIFT 8
134: #define REG_OUTMAIL_CMD_OPMODE_MASK GENMASK(11, 8)
135:
136: #define REG_FW_STS 0x39944
137: #define REG_FW_STS_NVM_AUTH_DONE BIT(31)
138: #define REG_FW_STS_CIO_RESET_REQ BIT(30)
139: #define REG_FW_STS_ICM_EN_CPU BIT(2)
140: #define REG_FW_STS_ICM_EN_INVERT BIT(1)
141: #define REG_FW_STS_ICM_EN BIT(0)
142:
143: /* ICL NHI VSEC registers */
144:
145: /* FW ready */
146: #define VS_CAP_9 0xc8
147: #define VS_CAP_9_FW_READY BIT(31)
148: /* UUID */
149: #define VS_CAP_10 0xcc
150: #define VS_CAP_11 0xd0
151: /* LTR */
152: #define VS_CAP_15 0xe0
153: #define VS_CAP_16 0xe4
154: /* TBT2PCIe */
155: #define VS_CAP_18 0xec
156: #define VS_CAP_18_DONE BIT(0)
157: /* PCIe2TBT */
158: #define VS_CAP_19 0xf0
159: #define VS_CAP_19_VALID BIT(0)
160: #define VS_CAP_19_CMD_SHIFT 1
161: #define VS_CAP_19_CMD_MASK GENMASK(7, 1)
162: /* Force power */
163: #define VS_CAP_22 0xfc
164: #define VS_CAP_22_FORCE_POWER BIT(1)
165: #define VS_CAP_22_DMA_DELAY_MASK GENMASK(31, 24)
166: #define VS_CAP_22_DMA_DELAY_SHIFT 24
167:
168: /**
169: * enum icl_lc_mailbox_cmd - ICL specific LC mailbox commands
170: * @ICL_LC_GO2SX: Ask LC to enter Sx without wake
171: * @ICL_LC_GO2SX_NO_WAKE: Ask LC to enter Sx with wake
172: * @ICL_LC_PREPARE_FOR_RESET: Prepare LC for reset
173: */
174: enum icl_lc_mailbox_cmd {
175: ICL_LC_GO2SX = 0x02,
176: ICL_LC_GO2SX_NO_WAKE = 0x03,
177: ICL_LC_PREPARE_FOR_RESET = 0x21,
178: };
179:
180: #endif
]
|
| 84/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 6097
output: 38
thoughts: 367
Thoughts: **My Thought Process on Thunderbolt NHI Register Exploration**
Okay, so my initial dive into the Thunderbolt driver code, specifically `drivers/thunderbolt/nhi_regs.h`, has revealed something interesting. I noticed several register definitions that have offsets *larger* than `0x39640`, which I recognize as the offset for `REG_CAPS`. The registers I've identified with these higher offsets are: `REG_DMA_MISC` at `0x39864`, `REG_RESET` at `0x39898`, `REG_INMAIL_DATA` at `0x39900`, `REG_INMAIL_CMD` at `0x39904`, `REG_OUTMAIL_CMD` at `0x3990c`, and `REG_FW_STS` at `0x39944`.
This immediately prompts me to ask: are there *any other* registers, defined in this file or perhaps elsewhere, that also fall into this higher offset range? And critically, where are these registers being *used*? I need to understand the context of their access.
So, my next logical step is to broaden my search. I'm going to look for any other register definitions within `drivers/thunderbolt/` that have offsets similar to these higher values, perhaps by searching for patterns like `0x39` or even just `0x3` to cast a wider net.
But before I go too deep into register definitions, I should solidify my understanding of the core component I'm examining. What exactly *is* the NHI driver? I quickly check and confirm that the NHI driver's implementation is primarily found in files like `drivers/thunderbolt/nhi.c` and `drivers/thunderbolt/nhi.h`, and likely others within that directory.
With that in mind, my investigation now needs to focus on how these registers are actually interacted with. I'll be looking through all the files within the `drivers/thunderbolt/` directory to find any instances where registers are being read from or written to. My primary targets for this search will be common I/O functions like `ioread`, `iowrite`, `readl`, and `writel`. I'm also keeping an eye out for any references to `tb_ring` or direct mentions of `nhi` registers, as these are likely indicators of direct hardware interaction by the driver. This comprehensive grep will help me pinpoint exactly which parts of the driver are touching these higher-offset registers and in what manner.
|
| 85/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Args: map[Expression:(readl|writel|ioread|iowrite) PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/icm.c=375=static bool icm_firmware_running(const struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-378-
drivers/thunderbolt/icm.c:379: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-380- return !!(val & REG_FW_STS_ICM_EN);
--
drivers/thunderbolt/icm.c=1509=static int icm_ar_get_mode(struct tb *tb)
--
drivers/thunderbolt/icm.c-1515- do {
drivers/thunderbolt/icm.c:1516: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1517- if (val & REG_FW_STS_NVM_AUTH_DONE)
--
drivers/thunderbolt/icm.c=1719=static bool icm_tgl_is_supported(struct tb *tb)
--
drivers/thunderbolt/icm.c-1725-
drivers/thunderbolt/icm.c:1726: val = ioread32(tb->nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1727- if (val & REG_FW_STS_NVM_AUTH_DONE)
--
drivers/thunderbolt/icm.c=1837=static int icm_firmware_reset(struct tb *tb, struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-1845- /* Put ARC to wait for CIO reset event to happen */
drivers/thunderbolt/icm.c:1846: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1847- val |= REG_FW_STS_CIO_RESET_REQ;
drivers/thunderbolt/icm.c:1848: iowrite32(val, nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1849-
drivers/thunderbolt/icm.c-1850- /* Re-start ARC */
drivers/thunderbolt/icm.c:1851: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1852- val |= REG_FW_STS_ICM_EN_INVERT;
drivers/thunderbolt/icm.c-1853- val |= REG_FW_STS_ICM_EN_CPU;
drivers/thunderbolt/icm.c:1854: iowrite32(val, nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1855-
--
drivers/thunderbolt/icm.c=1860=static int icm_firmware_start(struct tb *tb, struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-1878- /* Check that the ICM firmware is running */
drivers/thunderbolt/icm.c:1879: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1880- if (val & REG_FW_STS_NVM_AUTH_DONE)
--
drivers/thunderbolt/nhi.c=51=static void nhi_mask_interrupt(struct tb_nhi *nhi, int mask, int ring)
--
drivers/thunderbolt/nhi.c-55-
drivers/thunderbolt/nhi.c:56: val = ioread32(nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
drivers/thunderbolt/nhi.c:57: iowrite32(val & ~mask, nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
drivers/thunderbolt/nhi.c-58- } else {
drivers/thunderbolt/nhi.c:59: iowrite32(mask, nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring);
drivers/thunderbolt/nhi.c-60- }
--
drivers/thunderbolt/nhi.c=63=static void nhi_clear_interrupt(struct tb_nhi *nhi, int ring)
--
drivers/thunderbolt/nhi.c-65- if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
drivers/thunderbolt/nhi.c:66: ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + ring);
drivers/thunderbolt/nhi.c-67- else
drivers/thunderbolt/nhi.c:68: iowrite32(~0, nhi->iobase + REG_RING_INT_CLEAR + ring);
drivers/thunderbolt/nhi.c-69-}
--
drivers/thunderbolt/nhi.c=76=static void ring_interrupt_active(struct tb_ring *ring, bool active)
--
drivers/thunderbolt/nhi.c-105- */
drivers/thunderbolt/nhi.c:106: misc = ioread32(ring->nhi->iobase + REG_DMA_MISC);
drivers/thunderbolt/nhi.c-107- if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT)
--
drivers/thunderbolt/nhi.c-111- if (!(misc & auto_clear_bit))
drivers/thunderbolt/nhi.c:112: iowrite32(misc | auto_clear_bit,
drivers/thunderbolt/nhi.c-113- ring->nhi->iobase + REG_DMA_MISC);
--
drivers/thunderbolt/nhi.c-117- shift = index % REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
drivers/thunderbolt/nhi.c:118: ivr = ioread32(ivr_base + step);
drivers/thunderbolt/nhi.c-119- ivr &= ~(REG_INT_VEC_ALLOC_MASK << shift);
--
drivers/thunderbolt/nhi.c-121- ivr |= ring->vector << shift;
drivers/thunderbolt/nhi.c:122: iowrite32(ivr, ivr_base + step);
drivers/thunderbolt/nhi.c-123-
--
drivers/thunderbolt/nhi.c-126- itr &= REG_INT_THROTTLING_RATE_INTERVAL_MASK;
drivers/thunderbolt/nhi.c:127: iowrite32(itr, ring->nhi->iobase + REG_INT_THROTTLING_RATE +
drivers/thunderbolt/nhi.c-128- ring->vector * 4);
--
drivers/thunderbolt/nhi.c-130-
drivers/thunderbolt/nhi.c:131: old = ioread32(ring->nhi->iobase + reg);
drivers/thunderbolt/nhi.c-132- if (active)
--
drivers/thunderbolt/nhi.c-146- if (active)
drivers/thunderbolt/nhi.c:147: iowrite32(new, ring->nhi->iobase + reg);
drivers/thunderbolt/nhi.c-148- else
--
drivers/thunderbolt/nhi.c=179=static void __iomem *ring_options_base(struct tb_ring *ring)
--
drivers/thunderbolt/nhi.c-186-
drivers/thunderbolt/nhi.c:187:static void ring_iowrite_cons(struct tb_ring *ring, u16 cons)
drivers/thunderbolt/nhi.c-188-{
--
drivers/thunderbolt/nhi.c-190- * The other 16-bits in the register is read-only and writes to it
drivers/thunderbolt/nhi.c:191: * are ignored by the hardware so we can save one ioread32() by
drivers/thunderbolt/nhi.c-192- * filling the read-only bits with zeroes.
drivers/thunderbolt/nhi.c-193- */
drivers/thunderbolt/nhi.c:194: iowrite32(cons, ring_desc_base(ring) + 8);
drivers/thunderbolt/nhi.c-195-}
drivers/thunderbolt/nhi.c-196-
drivers/thunderbolt/nhi.c:197:static void ring_iowrite_prod(struct tb_ring *ring, u16 prod)
drivers/thunderbolt/nhi.c-198-{
drivers/thunderbolt/nhi.c:199: /* See ring_iowrite_cons() above for explanation */
drivers/thunderbolt/nhi.c:200: iowrite32(prod << 16, ring_desc_base(ring) + 8);
drivers/thunderbolt/nhi.c-201-}
drivers/thunderbolt/nhi.c-202-
drivers/thunderbolt/nhi.c:203:static void ring_iowrite32desc(struct tb_ring *ring, u32 value, u32 offset)
drivers/thunderbolt/nhi.c-204-{
drivers/thunderbolt/nhi.c:205: iowrite32(value, ring_desc_base(ring) + offset);
drivers/thunderbolt/nhi.c-206-}
drivers/thunderbolt/nhi.c-207-
drivers/thunderbolt/nhi.c:208:static void ring_iowrite64desc(struct tb_ring *ring, u64 value, u32 offset)
drivers/thunderbolt/nhi.c-209-{
drivers/thunderbolt/nhi.c:210: iowrite32(value, ring_desc_base(ring) + offset);
drivers/thunderbolt/nhi.c:211: iowrite32(value >> 32, ring_desc_base(ring) + offset + 4);
drivers/thunderbolt/nhi.c-212-}
drivers/thunderbolt/nhi.c-213-
drivers/thunderbolt/nhi.c:214:static void ring_iowrite32options(struct tb_ring *ring, u32 value, u32 offset)
drivers/thunderbolt/nhi.c-215-{
drivers/thunderbolt/nhi.c:216: iowrite32(value, ring_options_base(ring) + offset);
drivers/thunderbolt/nhi.c-217-}
--
drivers/thunderbolt/nhi.c=234=static void ring_write_descriptors(struct tb_ring *ring)
--
drivers/thunderbolt/nhi.c-252- if (ring->is_tx)
drivers/thunderbolt/nhi.c:253: ring_iowrite_prod(ring, ring->head);
drivers/thunderbolt/nhi.c-254- else
drivers/thunderbolt/nhi.c:255: ring_iowrite_cons(ring, ring->head);
drivers/thunderbolt/nhi.c-256- }
--
drivers/thunderbolt/nhi.c=380=static void __ring_interrupt_mask(struct tb_ring *ring, bool mask)
--
drivers/thunderbolt/nhi.c-386-
drivers/thunderbolt/nhi.c:387: val = ioread32(ring->nhi->iobase + reg);
drivers/thunderbolt/nhi.c-388- if (mask)
--
drivers/thunderbolt/nhi.c-391- val |= BIT(bit);
drivers/thunderbolt/nhi.c:392: iowrite32(val, ring->nhi->iobase + reg);
drivers/thunderbolt/nhi.c-393-}
--
drivers/thunderbolt/nhi.c=429=static void ring_clear_msix(const struct tb_ring *ring)
--
drivers/thunderbolt/nhi.c-437- if (ring->is_tx)
drivers/thunderbolt/nhi.c:438: iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR);
drivers/thunderbolt/nhi.c-439- else
drivers/thunderbolt/nhi.c:440: iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR +
drivers/thunderbolt/nhi.c-441- 4 * (ring->nhi->hop_count / 32));
--
drivers/thunderbolt/nhi.c=642=void tb_ring_start(struct tb_ring *ring)
--
drivers/thunderbolt/nhi.c-666-
drivers/thunderbolt/nhi.c:667: ring_iowrite64desc(ring, ring->descriptors_dma, 0);
drivers/thunderbolt/nhi.c-668- if (ring->is_tx) {
drivers/thunderbolt/nhi.c:669: ring_iowrite32desc(ring, ring->size, 12);
drivers/thunderbolt/nhi.c:670: ring_iowrite32options(ring, 0, 4);
drivers/thunderbolt/nhi.c:671: ring_iowrite32options(ring, flags, 0);
drivers/thunderbolt/nhi.c-672- } else {
--
drivers/thunderbolt/nhi.c-674-
drivers/thunderbolt/nhi.c:675: ring_iowrite32desc(ring, (frame_size << 16) | ring->size, 12);
drivers/thunderbolt/nhi.c:676: ring_iowrite32options(ring, sof_eof_mask, 4);
drivers/thunderbolt/nhi.c:677: ring_iowrite32options(ring, flags, 0);
drivers/thunderbolt/nhi.c-678- }
--
drivers/thunderbolt/nhi.c-700- flags |= RING_FLAG_E2E_FLOW_CONTROL;
drivers/thunderbolt/nhi.c:701: ring_iowrite32options(ring, flags, 0);
drivers/thunderbolt/nhi.c-702- }
--
drivers/thunderbolt/nhi.c=751=void tb_ring_stop(struct tb_ring *ring)
--
drivers/thunderbolt/nhi.c-765-
drivers/thunderbolt/nhi.c:766: ring_iowrite32options(ring, 0, 0);
drivers/thunderbolt/nhi.c:767: ring_iowrite64desc(ring, 0, 0);
drivers/thunderbolt/nhi.c:768: ring_iowrite32desc(ring, 0, 8);
drivers/thunderbolt/nhi.c:769: ring_iowrite32desc(ring, 0, 12);
drivers/thunderbolt/nhi.c-770- ring->head = 0;
--
drivers/thunderbolt/nhi.c=870=int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data)
--
drivers/thunderbolt/nhi.c-874-
drivers/thunderbolt/nhi.c:875: iowrite32(data, nhi->iobase + REG_INMAIL_DATA);
drivers/thunderbolt/nhi.c-876-
drivers/thunderbolt/nhi.c:877: val = ioread32(nhi->iobase + REG_INMAIL_CMD);
drivers/thunderbolt/nhi.c-878- val &= ~(REG_INMAIL_CMD_MASK | REG_INMAIL_ERROR);
drivers/thunderbolt/nhi.c-879- val |= REG_INMAIL_OP_REQUEST | cmd;
drivers/thunderbolt/nhi.c:880: iowrite32(val, nhi->iobase + REG_INMAIL_CMD);
drivers/thunderbolt/nhi.c-881-
--
drivers/thunderbolt/nhi.c-883- do {
drivers/thunderbolt/nhi.c:884: val = ioread32(nhi->iobase + REG_INMAIL_CMD);
drivers/thunderbolt/nhi.c-885- if (!(val & REG_INMAIL_OP_REQUEST))
--
drivers/thunderbolt/nhi.c=907=enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi)
--
drivers/thunderbolt/nhi.c-910-
drivers/thunderbolt/nhi.c:911: val = ioread32(nhi->iobase + REG_OUTMAIL_CMD);
drivers/thunderbolt/nhi.c-912- val &= REG_OUTMAIL_CMD_OPMODE_MASK;
--
drivers/thunderbolt/nhi.c=918=void nhi_interrupt_work(struct work_struct *work)
--
drivers/thunderbolt/nhi.c-935- if (bit % 32 == 0)
drivers/thunderbolt/nhi.c:936: value = ioread32(nhi->iobase
drivers/thunderbolt/nhi.c-937- + REG_RING_NOTIFY_BASE
--
drivers/thunderbolt/nhi.c=1132=static void nhi_reset(struct tb_nhi *nhi)
--
drivers/thunderbolt/nhi.c-1136-
drivers/thunderbolt/nhi.c:1137: val = ioread32(nhi->iobase + REG_CAPS);
drivers/thunderbolt/nhi.c-1138- /* Reset only v2 and later routers */
--
drivers/thunderbolt/nhi.c-1146-
drivers/thunderbolt/nhi.c:1147: iowrite32(REG_RESET_HRR, nhi->iobase + REG_RESET);
drivers/thunderbolt/nhi.c-1148- msleep(100);
--
drivers/thunderbolt/nhi.c-1151- do {
drivers/thunderbolt/nhi.c:1152: val = ioread32(nhi->iobase + REG_RESET);
drivers/thunderbolt/nhi.c-1153- if (!(val & REG_RESET_HRR)) {
--
drivers/thunderbolt/nhi.c=1186=int nhi_probe(struct tb_nhi *nhi)
--
drivers/thunderbolt/nhi.c-1197-
drivers/thunderbolt/nhi.c:1198: nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
drivers/thunderbolt/nhi.c-1199- dev_dbg(dev, "total paths: %d\n", nhi->hop_count);
]
|
| 86/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 11441
output: 32
thoughts: 96
Thoughts: **My Investigative Process Regarding Thunderbolt Driver Register Access**
My current objective is to thoroughly understand how registers are being accessed within the Thunderbolt driver stack. To do this, I need to identify all relevant files that might be involved in direct register manipulation.
My initial scan of `drivers/thunderbolt/` has led me to consider a few specific files that I believe warrant closer examination. I'm asking myself: are there other files within this directory besides the ones I've already identified that might be directly interacting with hardware registers?
Specifically, I'm wondering about the potential register access patterns in files like `lc.c`, `usb4.c`, `switch.c`, and `tb.c`. These names suggest they could be core components or peripheral handlers within the Thunderbolt infrastructure.
A crucial step in my thought process is to confirm whether these files are indeed part of what I'm defining as the "thunderbolt nhi driver." This distinction is important for scope and to ensure I'm not straying into unrelated areas.
To achieve this confirmation and gain a clear overview of the driver's compilation structure, my next logical action is to examine the `drivers/thunderbolt/Makefile`. This will explicitly tell me which files are being built into the Thunderbolt driver, thus providing a definitive list of components I need to analyze for register access.
|
| 87/4 |
2026/08/10 08:30 |
tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/Makefile FirstLine:1 LineCount:50]
Results: map[Contents: 1: # SPDX-License-Identifier: GPL-2.0-only
2: ccflags-y := -I$(src)
3: obj-${CONFIG_USB4} := thunderbolt.o
4: thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o pci.o path.o tunnel.o eeprom.o
5: thunderbolt-objs += domain.o dma_port.o icm.o property.o xdomain.o lc.o tmu.o usb4.o
6: thunderbolt-objs += usb4_port.o nvm.o retimer.o quirks.o clx.o
7:
8: thunderbolt-${CONFIG_ACPI} += acpi.o
9: thunderbolt-$(CONFIG_DEBUG_FS) += debugfs.o
10: thunderbolt-$(CONFIG_USB4_CONFIGFS) += configfs.o
11: thunderbolt-${CONFIG_USB4_KUNIT_TEST} += test.o
12: CFLAGS_test.o += $(DISABLE_STRUCTLEAK_PLUGIN)
13:
14: thunderbolt_dma_test-${CONFIG_USB4_DMA_TEST} += dma_test.o
15: obj-$(CONFIG_USB4_DMA_TEST) += thunderbolt_dma_test.o
16:
17: thunderbolt_stream-${CONFIG_USB4_STREAM} += stream.o
18: obj-$(CONFIG_USB4_STREAM) += thunderbolt_stream.o
]
|
| 88/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 11955
output: 39
thoughts: 947
Thoughts: **My Thought Process on Thunderbolt NHI Driver Registers**
My immediate thought upon seeing the question about Thunderbolt registers, specifically those exceeding an offset of `0x39640`, was to focus on the core compilation unit, which I know is typically handled by `thunderbolt.o` or `thunderbolt-objs`. However, I quickly reminded myself to re-read the precise query: "Is there any other register accessed by thunderbolt nhi driver that has an offset larger than 0x39640?" This directed my attention to the specifics of the NHI (Thunderbolt Network Interface) driver.
My next step was to systematically examine where register definitions and accesses are declared and implemented. The obvious place to start was `nhi_regs.h`, as this is where the symbolic names for register offsets are usually defined. I meticulously went through the list provided in `nhi_regs.h`:
* `REG_TX_RING_BASE` at `0x00000`
* `REG_RX_RING_BASE` at `0x08000`
* `REG_TX_OPTIONS_BASE` at `0x19800`
* `REG_RX_OPTIONS_BASE` at `0x29800`
* `REG_RING_NOTIFY_BASE` at `0x37800`
* `REG_RING_INT_CLEAR` at `0x37808`
* `REG_RING_INTERRUPT_BASE` at `0x38200`
* `REG_RING_INTERRUPT_MASK_CLEAR_BASE` at `0x38208`
* `REG_INT_THROTTLING_RATE` at `0x38c00`
* `REG_INT_VEC_ALLOC_BASE` at `0x38c40`
* `REG_CAPS` at `0x39640`
As I reviewed this list, I specifically noted `REG_CAPS` sitting precisely at the threshold of `0x39640`. The question asks for registers *larger* than this, so `REG_CAPS` itself doesn't fit the criteria, but it's a crucial reference point.
However, I realized that simply checking the header file might not be exhaustive. Register accesses could be defined elsewhere, or new registers might be defined and used without being explicitly listed in that particular header. Therefore, my thought process evolved to consider other potential locations for register definitions and, more importantly, where these registers are actually *accessed* within the NHI driver's source code. This led me to look at `nhi.c` and any other files contributing to the NHI driver's functionality.
To confirm if any registers *defined* in `nhi_regs.h` already exceeded `0x39640`, I identified the ones from the list that met this condition:
* `REG_DMA_MISC` at `0x39864`
* `REG_RESET` at `0x39898`
* `REG_INMAIL_DATA` at `0x39900`
* `REG_INMAIL_CMD` at `0x39904`
* `REG_OUTMAIL_CMD` at `0x3990c`
* `REG_FW_STS` at `0x39944`
These are the first set of registers that clearly satisfy the "larger than `0x39640`" condition based on the provided definitions.
Still, I wasn't entirely satisfied. The possibility of other registers, either defined elsewhere or used through different mechanisms (like macros that resolve to offsets), remained. To ensure I didn't miss anything, I decided to perform a broader search. My instinct was to look for hexadecimal values within a relevant range in the `drivers/thunderbolt/` directory. I specifically targeted the prefixes that would encompass values immediately following `0x39640` and extending upwards. This included searching for hex numbers starting with `0x39` (beyond the already identified ones), `0x3a`, `0x3b`, `0x3c`, `0x3d`, `0x3e`, `0x3f`, and then jumping to higher ranges like `0x4` through `0xf` multiplied by powers of 16.
To make this search efficient and precise, I decided the best tool would be `grepper` (or a similar command-line utility like `grep` with appropriate flags). My final thought was to initiate a targeted search for the string `0x39` within the `drivers/thunderbolt/` directory, as this would likely reveal any other defined offsets or accesses in that vicinity or, at the very least, give me a starting point for a more granular search if needed. This systematic approach, moving from specific header files to broader code searches, is my standard procedure for ensuring a comprehensive understanding of register usage.
|
| 89/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Args: map[Expression:0x39[0-9a-fA-F]+ PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-113-/* The last 11 bits contain the number of hops supported by the NHI port. */
drivers/thunderbolt/nhi_regs.h:114:#define REG_CAPS 0x39640
drivers/thunderbolt/nhi_regs.h-115-#define REG_CAPS_VERSION_MASK GENMASK(23, 16)
--
drivers/thunderbolt/nhi_regs.h-117-
drivers/thunderbolt/nhi_regs.h:118:#define REG_DMA_MISC 0x39864
drivers/thunderbolt/nhi_regs.h-119-#define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2)
--
drivers/thunderbolt/nhi_regs.h-121-
drivers/thunderbolt/nhi_regs.h:122:#define REG_RESET 0x39898
drivers/thunderbolt/nhi_regs.h-123-#define REG_RESET_HRR BIT(0)
drivers/thunderbolt/nhi_regs.h-124-
drivers/thunderbolt/nhi_regs.h:125:#define REG_INMAIL_DATA 0x39900
drivers/thunderbolt/nhi_regs.h-126-
drivers/thunderbolt/nhi_regs.h:127:#define REG_INMAIL_CMD 0x39904
drivers/thunderbolt/nhi_regs.h-128-#define REG_INMAIL_CMD_MASK GENMASK(7, 0)
--
drivers/thunderbolt/nhi_regs.h-131-
drivers/thunderbolt/nhi_regs.h:132:#define REG_OUTMAIL_CMD 0x3990c
drivers/thunderbolt/nhi_regs.h-133-#define REG_OUTMAIL_CMD_OPMODE_SHIFT 8
--
drivers/thunderbolt/nhi_regs.h-135-
drivers/thunderbolt/nhi_regs.h:136:#define REG_FW_STS 0x39944
drivers/thunderbolt/nhi_regs.h-137-#define REG_FW_STS_NVM_AUTH_DONE BIT(31)
]
|
| 90/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 13528
output: 49
thoughts: 159
Thoughts: **My Thought Process on Approaching This Search Query**
Initially, my mind grappled with the idea of searching for specific, seemingly arbitrary hexadecimal values: `0x3a`, `0x3b`, `0x3c`, `0x3d`, `0x3e`, `0x3f`, `0x4`, `0x5`, `0x6`, `0x7`, `0x8`, `0x9`, `0xa`, `0xb`, `0xc`, `0xd`, `0xe`, `0xf`. This felt a bit scattershot, like looking for specific grains of sand on a beach without a clear strategy. I recognized that while these might be *individual* interesting values, simply listing them felt inefficient. There had to be a more structured way to approach what I was likely trying to find – patterns or specific types of hexadecimal representations within a codebase.
This led me to refine my thinking. I realized that the `0x` prefix clearly indicates hexadecimal notation. The single-digit hex values (`0x4` through `0xf`) were likely part of a broader range I was interested in. The two-digit values (`0x3a` through `0x3f`) also hinted at a specific range of interest, perhaps a contiguous block of bytes or a specific set of markers. The repetition suggested I wasn't just looking for *any* hex values, but rather values within a particular segment of the hexadecimal spectrum.
Then, a more precise pattern emerged in my mind. I started thinking about how these hexadecimal values are represented and how they might appear in code. The initial list of single and double hex values felt like precursors to a more complex structure. This is where the idea of regular expressions began to solidify. I started to conceptualize a pattern that would capture not just isolated hex numbers, but also those that are part of a larger hexadecimal sequence.
Specifically, I thought about the structure of hexadecimal numbers in code. They often begin with `0x`. Then, depending on their length and significance, they might be followed by a certain number of hexadecimal digits. My initial list was a bit of a jumble, but it pointed towards a need to capture values that started with `0x` and were followed by at least one hex digit.
My refinement then zeroed in on a more robust and common pattern: a hexadecimal number that begins with `0x`, followed by a hexadecimal digit from 4 through 9 (both uppercase and lowercase), and then followed by four *more* hexadecimal digits (again, uppercase or lowercase). This felt like a much more targeted and likely useful search pattern. The `[4-9a-fA-F]` part directly addresses the lower bound of my initial hex range (`0x4` through `0xf`, with `a-f` covering the rest), while the `{4}` ensures I'm looking for values of a specific, and likely significant, length after the initial digit. The choice of targeting this specific length (five hex digits after `0x`) often signifies specific data structures, pointers, or constants that are of particular interest in lower-level code.
Finally, to ensure I was looking in the most relevant place, I narrowed the scope of my search. Given the nature of the hex values I was considering, they likely relate to low-level system operations or hardware interfaces. The `drivers/thunderbolt/` directory immediately came to mind as the most probable location within a codebase for such specific hexadecimal encodings related to hardware interaction. This directory would house code directly managing the Thunderbolt interface, which is rich with hardware-specific constants and registers represented in hexadecimal. This combination of a precise regex and a targeted directory seemed like the most effective way to uncover the information I was seeking.
|
| 91/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Args: map[Expression:0x[4-9a-fA-F][0-9a-fA-F]{4} PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/acpi.c=181=static const guid_t retimer_dsm_guid =
drivers/thunderbolt/acpi.c:182: GUID_INIT(0xe0053122, 0x795b, 0x4122,
drivers/thunderbolt/acpi.c-183- 0x8a, 0x5e, 0x57, 0xbe, 0x1d, 0x26, 0xac, 0xb3);
--
drivers/thunderbolt/dma_port.c=168=static int dma_find_port(struct tb_switch *sw)
--
drivers/thunderbolt/dma_port.c-182- 2, 1, DMA_PORT_TIMEOUT);
drivers/thunderbolt/dma_port.c:183: if (!ret && (type & 0xffffff) == TB_TYPE_NHI)
drivers/thunderbolt/dma_port.c-184- return ports[i];
--
drivers/thunderbolt/eeprom.c=362=static int tb_drom_parse_entry_port(struct tb_switch *sw,
--
drivers/thunderbolt/eeprom.c-385- return res;
drivers/thunderbolt/eeprom.c:386: type &= 0xffffff;
drivers/thunderbolt/eeprom.c-387-
--
drivers/thunderbolt/icm.c=1579=static int icm_ar_get_boot_acl(struct tb *tb, uuid_t *uuids, size_t nuuids)
--
drivers/thunderbolt/icm.c-1601-
drivers/thunderbolt/icm.c:1602: if (uuid[0] == 0xffffffff && uuid[1] == 0xffffffff) {
drivers/thunderbolt/icm.c-1603- /* Map empty entries to null UUID */
--
drivers/thunderbolt/icm.c-1607- /* Upper two DWs are always one's */
drivers/thunderbolt/icm.c:1608: uuid[2] = 0xffffffff;
drivers/thunderbolt/icm.c:1609: uuid[3] = 0xffffffff;
drivers/thunderbolt/icm.c-1610- }
--
drivers/thunderbolt/icm.c=1616=static int icm_ar_set_boot_acl(struct tb *tb, const uuid_t *uuids,
--
drivers/thunderbolt/icm.c-1635- */
drivers/thunderbolt/icm.c:1636: request.acl[i].uuid_lo = 0xffffffff;
drivers/thunderbolt/icm.c:1637: request.acl[i].uuid_hi = 0xffffffff;
drivers/thunderbolt/icm.c-1638- } else {
drivers/thunderbolt/icm.c-1639- /* Two high DWs need to be set to all one */
drivers/thunderbolt/icm.c:1640: if (uuid[2] != 0xffffffff || uuid[3] != 0xffffffff)
drivers/thunderbolt/icm.c-1641- return -EINVAL;
--
drivers/thunderbolt/icm.c=1687=static void icm_icl_set_uuid(struct tb *tb)
--
drivers/thunderbolt/icm.c-1693- pci_read_config_dword(pdev, VS_CAP_11, &uuid[1]);
drivers/thunderbolt/icm.c:1694: uuid[2] = 0xffffffff;
drivers/thunderbolt/icm.c:1695: uuid[3] = 0xffffffff;
drivers/thunderbolt/icm.c-1696-
--
drivers/thunderbolt/nvm.c=89=static int intel_switch_nvm_validate(struct tb_nvm *nvm)
--
drivers/thunderbolt/nvm.c-101- */
drivers/thunderbolt/nvm.c:102: hdr_size = (*(u32 *)buf) & 0xffffff;
drivers/thunderbolt/nvm.c-103- if (hdr_size + INTEL_NVM_DEVID + 2 >= image_size)
--
drivers/thunderbolt/nvm.c=160=static int asmedia_switch_nvm_version(struct tb_nvm *nvm)
--
drivers/thunderbolt/nvm.c-169-
drivers/thunderbolt/nvm.c:170: nvm->major = (val << 16) & 0xff0000;
drivers/thunderbolt/nvm.c-171- nvm->major |= val & 0x00ff00;
--
drivers/thunderbolt/nvm.c-177-
drivers/thunderbolt/nvm.c:178: nvm->minor = (val << 16) & 0xff0000;
drivers/thunderbolt/nvm.c-179- nvm->minor |= val & 0x00ff00;
--
drivers/thunderbolt/nvm.c=223=static int intel_retimer_nvm_validate(struct tb_nvm *nvm)
--
drivers/thunderbolt/nvm.c-235- */
drivers/thunderbolt/nvm.c:236: hdr_size = (*(u32 *)buf) & 0xffffff;
drivers/thunderbolt/nvm.c-237- if (hdr_size + INTEL_NVM_DEVID + 2 >= image_size)
--
drivers/thunderbolt/property.c=32=struct tb_property_dir_entry {
--
drivers/thunderbolt/property.c-36-
drivers/thunderbolt/property.c:37:#define TB_PROPERTY_ROOTDIR_MAGIC 0x55584401
drivers/thunderbolt/property.c-38-#define TB_PROPERTY_MAX_DEPTH 8
--
drivers/thunderbolt/sb_regs.h=21=enum usb4_sb_opcode {
drivers/thunderbolt/sb_regs.h-22- USB4_SB_OPCODE_ERR = 0x20525245, /* "ERR " */
drivers/thunderbolt/sb_regs.h:23: USB4_SB_OPCODE_ONS = 0x444d4321, /* "!CMD" */
drivers/thunderbolt/sb_regs.h:24: USB4_SB_OPCODE_ROUTER_OFFLINE = 0x4e45534c, /* "LSEN" */
drivers/thunderbolt/sb_regs.h:25: USB4_SB_OPCODE_ENUMERATE_RETIMERS = 0x4d554e45, /* "ENUM" */
drivers/thunderbolt/sb_regs.h:26: USB4_SB_OPCODE_SET_INBOUND_SBTX = 0x5055534c, /* "LSUP" */
drivers/thunderbolt/sb_regs.h:27: USB4_SB_OPCODE_UNSET_INBOUND_SBTX = 0x50555355, /* "USUP" */
drivers/thunderbolt/sb_regs.h:28: USB4_SB_OPCODE_QUERY_LAST_RETIMER = 0x5453414c, /* "LAST" */
drivers/thunderbolt/sb_regs.h:29: USB4_SB_OPCODE_QUERY_CABLE_RETIMER = 0x524c4243, /* "CBLR" */
drivers/thunderbolt/sb_regs.h:30: USB4_SB_OPCODE_GET_NVM_SECTOR_SIZE = 0x53534e47, /* "GNSS" */
drivers/thunderbolt/sb_regs.h:31: USB4_SB_OPCODE_NVM_SET_OFFSET = 0x53504f42, /* "BOPS" */
drivers/thunderbolt/sb_regs.h:32: USB4_SB_OPCODE_NVM_BLOCK_WRITE = 0x574b4c42, /* "BLKW" */
drivers/thunderbolt/sb_regs.h:33: USB4_SB_OPCODE_NVM_AUTH_WRITE = 0x48545541, /* "AUTH" */
drivers/thunderbolt/sb_regs.h:34: USB4_SB_OPCODE_NVM_READ = 0x52524641, /* "AFRR" */
drivers/thunderbolt/sb_regs.h:35: USB4_SB_OPCODE_READ_LANE_MARGINING_CAP = 0x50434452, /* "RDCP" */
drivers/thunderbolt/sb_regs.h:36: USB4_SB_OPCODE_RUN_HW_LANE_MARGINING = 0x474d4852, /* "RHMG" */
drivers/thunderbolt/sb_regs.h:37: USB4_SB_OPCODE_RUN_SW_LANE_MARGINING = 0x474d5352, /* "RSMG" */
drivers/thunderbolt/sb_regs.h:38: USB4_SB_OPCODE_READ_SW_MARGIN_ERR = 0x57534452, /* "RDSW" */
drivers/thunderbolt/sb_regs.h-39-};
--
drivers/thunderbolt/switch.c=1750=static int tb_plug_events_active(struct tb_switch *sw, bool active)
--
drivers/thunderbolt/switch.c-1762- if (active) {
drivers/thunderbolt/switch.c:1763: data = data & 0xFFFFFF83;
drivers/thunderbolt/switch.c-1764- switch (sw->config.device_id) {
--
drivers/thunderbolt/switch.c=2676=static int tb_switch_set_uuid(struct tb_switch *sw)
--
drivers/thunderbolt/switch.c-2709- */
drivers/thunderbolt/switch.c:2710: uuid[0] = sw->uid & 0xffffffff;
drivers/thunderbolt/switch.c:2711: uuid[1] = (sw->uid >> 32) & 0xffffffff;
drivers/thunderbolt/switch.c:2712: uuid[2] = 0xffffffff;
drivers/thunderbolt/switch.c:2713: uuid[3] = 0xffffffff;
drivers/thunderbolt/switch.c-2714- }
--
drivers/thunderbolt/test.c=72=static struct tb_switch *alloc_host(struct kunit *test)
--
drivers/thunderbolt/test.c-129- sw->ports[7].config.max_out_hop_id = 11;
drivers/thunderbolt/test.c:130: sw->ports[7].config.nfc_credits = 0x41800000;
drivers/thunderbolt/test.c-131-
--
drivers/thunderbolt/test.c=655=static void tb_test_path_complex_tree_walk(struct kunit *test)
--
drivers/thunderbolt/test.c-678- static const struct port_expectation test_data[] = {
drivers/thunderbolt/test.c:679: { .route = 0x50301, .port = 13, .type = TB_TYPE_DP_HDMI_IN },
drivers/thunderbolt/test.c:680: { .route = 0x50301, .port = 1, .type = TB_TYPE_PORT },
drivers/thunderbolt/test.c-681- { .route = 0x301, .port = 5, .type = TB_TYPE_PORT },
--
drivers/thunderbolt/test.c-686- { .route = 0x701, .port = 7, .type = TB_TYPE_PORT },
drivers/thunderbolt/test.c:687: { .route = 0x70701, .port = 1, .type = TB_TYPE_PORT },
drivers/thunderbolt/test.c:688: { .route = 0x70701, .port = 3, .type = TB_TYPE_PORT },
drivers/thunderbolt/test.c-689- { .route = 0x3070701, .port = 1, .type = TB_TYPE_PORT },
drivers/thunderbolt/test.c-690- { .route = 0x3070701, .port = 5, .type = TB_TYPE_PORT },
drivers/thunderbolt/test.c:691: { .route = 0x503070701, .port = 1, .type = TB_TYPE_PORT },
drivers/thunderbolt/test.c:692: { .route = 0x503070701, .port = 14, .type = TB_TYPE_DP_HDMI_OUT },
drivers/thunderbolt/test.c-693- };
--
drivers/thunderbolt/test.c-700- dev2 = alloc_dev_default(test, dev1, 0x301, true);
drivers/thunderbolt/test.c:701: dev3 = alloc_dev_with_dpin(test, dev2, 0x50301, true);
drivers/thunderbolt/test.c-702- alloc_dev_default(test, dev1, 0x501, true);
drivers/thunderbolt/test.c-703- dev5 = alloc_dev_default(test, dev1, 0x701, true);
drivers/thunderbolt/test.c:704: dev6 = alloc_dev_default(test, dev5, 0x70701, true);
drivers/thunderbolt/test.c-705- dev7 = alloc_dev_default(test, dev6, 0x3070701, true);
drivers/thunderbolt/test.c-706- alloc_dev_default(test, dev7, 0x303070701, true);
drivers/thunderbolt/test.c:707: dev9 = alloc_dev_default(test, dev7, 0x503070701, true);
drivers/thunderbolt/test.c-708-
--
drivers/thunderbolt/test.c=990=static void tb_test_path_not_bonded_lane1_chain(struct kunit *test)
--
drivers/thunderbolt/test.c-1028- {
drivers/thunderbolt/test.c:1029: .route = 0x50701,
drivers/thunderbolt/test.c-1030- .in_port = 2,
--
drivers/thunderbolt/test.c-1043- dev2 = alloc_dev_default(test, dev1, 0x701, false);
drivers/thunderbolt/test.c:1044: dev3 = alloc_dev_default(test, dev2, 0x50701, false);
drivers/thunderbolt/test.c-1045-
--
drivers/thunderbolt/test.c=1070=static void tb_test_path_not_bonded_lane1_chain_reverse(struct kunit *test)
--
drivers/thunderbolt/test.c-1087- {
drivers/thunderbolt/test.c:1088: .route = 0x50701,
drivers/thunderbolt/test.c-1089- .in_port = 13,
--
drivers/thunderbolt/test.c-1123- dev2 = alloc_dev_default(test, dev1, 0x701, false);
drivers/thunderbolt/test.c:1124: dev3 = alloc_dev_with_dpin(test, dev2, 0x50701, false);
drivers/thunderbolt/test.c-1125-
--
drivers/thunderbolt/test.c=1150=static void tb_test_path_mixed_chain(struct kunit *test)
--
drivers/thunderbolt/test.c-1192- {
drivers/thunderbolt/test.c:1193: .route = 0x50701,
drivers/thunderbolt/test.c-1194- .in_port = 2,
--
drivers/thunderbolt/test.c-1214- dev2 = alloc_dev_default(test, dev1, 0x701, false);
drivers/thunderbolt/test.c:1215: dev3 = alloc_dev_default(test, dev2, 0x50701, false);
drivers/thunderbolt/test.c-1216- dev4 = alloc_dev_default(test, dev3, 0x3050701, true);
--
drivers/thunderbolt/test.c=1242=static void tb_test_path_mixed_chain_reverse(struct kunit *test)
--
drivers/thunderbolt/test.c-1270- {
drivers/thunderbolt/test.c:1271: .route = 0x50701,
drivers/thunderbolt/test.c-1272- .in_port = 3,
--
drivers/thunderbolt/test.c-1306- dev2 = alloc_dev_default(test, dev1, 0x701, false);
drivers/thunderbolt/test.c:1307: dev3 = alloc_dev_default(test, dev2, 0x50701, false);
drivers/thunderbolt/test.c-1308- dev4 = alloc_dev_default(test, dev3, 0x3050701, true);
--
drivers/thunderbolt/test.c=1473=static void tb_test_tunnel_dp_tree(struct kunit *test)
--
drivers/thunderbolt/test.c-1499- alloc_dev_default(test, dev1, 0x703, true);
drivers/thunderbolt/test.c:1500: dev5 = alloc_dev_default(test, dev3, 0x50503, true);
drivers/thunderbolt/test.c-1501-
--
drivers/thunderbolt/test.c=1603=static void tb_test_tunnel_3dp(struct kunit *test)
--
drivers/thunderbolt/test.c-1629- dev4 = alloc_dev_default(test, dev1, 0x703, true);
drivers/thunderbolt/test.c:1630: dev5 = alloc_dev_default(test, dev3, 0x50503, true);
drivers/thunderbolt/test.c-1631-
--
drivers/thunderbolt/test.c=1724=static void tb_test_tunnel_port_on_path(struct kunit *test)
--
drivers/thunderbolt/test.c-1748- dev4 = alloc_dev_default(test, dev1, 0x703, true);
drivers/thunderbolt/test.c:1749: dev5 = alloc_dev_default(test, dev3, 0x50503, true);
drivers/thunderbolt/test.c-1750-
--
drivers/thunderbolt/test.c=2607=static const u32 root_directory[] = {
drivers/thunderbolt/test.c:2608: 0x55584401, /* "UXD" v1 */
drivers/thunderbolt/test.c-2609- 0x00000018, /* Root directory length */
drivers/thunderbolt/test.c:2610: 0x76656e64, /* "vend" */
drivers/thunderbolt/test.c:2611: 0x6f726964, /* "orid" */
drivers/thunderbolt/test.c:2612: 0x76000001, /* "v" R 1 */
drivers/thunderbolt/test.c-2613- 0x00000a27, /* Immediate value, ! Vendor ID */
drivers/thunderbolt/test.c:2614: 0x76656e64, /* "vend" */
drivers/thunderbolt/test.c:2615: 0x6f726964, /* "orid" */
drivers/thunderbolt/test.c:2616: 0x74000003, /* "t" R 3 */
drivers/thunderbolt/test.c-2617- 0x0000001a, /* Text leaf offset, (“Apple Inc.”) */
drivers/thunderbolt/test.c:2618: 0x64657669, /* "devi" */
drivers/thunderbolt/test.c:2619: 0x63656964, /* "ceid" */
drivers/thunderbolt/test.c:2620: 0x76000001, /* "v" R 1 */
drivers/thunderbolt/test.c-2621- 0x0000000a, /* Immediate value, ! Device ID */
drivers/thunderbolt/test.c:2622: 0x64657669, /* "devi" */
drivers/thunderbolt/test.c:2623: 0x63656964, /* "ceid" */
drivers/thunderbolt/test.c:2624: 0x74000003, /* "t" R 3 */
drivers/thunderbolt/test.c-2625- 0x0000001d, /* Text leaf offset, (“Macintosh”) */
drivers/thunderbolt/test.c:2626: 0x64657669, /* "devi" */
drivers/thunderbolt/test.c:2627: 0x63657276, /* "cerv" */
drivers/thunderbolt/test.c:2628: 0x76000001, /* "v" R 1 */
drivers/thunderbolt/test.c:2629: 0x80000100, /* Immediate value, Device Revision */
drivers/thunderbolt/test.c:2630: 0x6e657477, /* "netw" */
drivers/thunderbolt/test.c:2631: 0x6f726b00, /* "ork" */
drivers/thunderbolt/test.c:2632: 0x44000014, /* "D" R 20 */
drivers/thunderbolt/test.c-2633- 0x00000021, /* Directory data offset, (Network Directory) */
drivers/thunderbolt/test.c:2634: 0x4170706c, /* "Appl" */
drivers/thunderbolt/test.c:2635: 0x6520496e, /* "e In" */
drivers/thunderbolt/test.c:2636: 0x632e0000, /* "c." ! */
drivers/thunderbolt/test.c:2637: 0x4d616369, /* "Maci" */
drivers/thunderbolt/test.c:2638: 0x6e746f73, /* "ntos" */
drivers/thunderbolt/test.c:2639: 0x68000000, /* "h" */
drivers/thunderbolt/test.c-2640- 0x00000000, /* padding */
drivers/thunderbolt/test.c:2641: 0xca8961c6, /* Directory UUID, Network Directory */
drivers/thunderbolt/test.c:2642: 0x9541ce1c, /* Directory UUID, Network Directory */
drivers/thunderbolt/test.c:2643: 0x5949b8bd, /* Directory UUID, Network Directory */
drivers/thunderbolt/test.c:2644: 0x4f5a5f2e, /* Directory UUID, Network Directory */
drivers/thunderbolt/test.c:2645: 0x70727463, /* "prtc" */
drivers/thunderbolt/test.c:2646: 0x69640000, /* "id" */
drivers/thunderbolt/test.c:2647: 0x76000001, /* "v" R 1 */
drivers/thunderbolt/test.c-2648- 0x00000001, /* Immediate value, Network Protocol ID */
drivers/thunderbolt/test.c:2649: 0x70727463, /* "prtc" */
drivers/thunderbolt/test.c:2650: 0x76657273, /* "vers" */
drivers/thunderbolt/test.c:2651: 0x76000001, /* "v" R 1 */
drivers/thunderbolt/test.c-2652- 0x00000001, /* Immediate value, Network Protocol Version */
drivers/thunderbolt/test.c:2653: 0x70727463, /* "prtc" */
drivers/thunderbolt/test.c:2654: 0x72657673, /* "revs" */
drivers/thunderbolt/test.c:2655: 0x76000001, /* "v" R 1 */
drivers/thunderbolt/test.c-2656- 0x00000001, /* Immediate value, Network Protocol Revision */
drivers/thunderbolt/test.c:2657: 0x70727463, /* "prtc" */
drivers/thunderbolt/test.c:2658: 0x73746e73, /* "stns" */
drivers/thunderbolt/test.c:2659: 0x76000001, /* "v" R 1 */
drivers/thunderbolt/test.c-2660- 0x00000000, /* Immediate value, Network Protocol Settings */
--
drivers/thunderbolt/test.c=2663=static const uuid_t network_dir_uuid =
drivers/thunderbolt/test.c:2664: UUID_INIT(0xc66189ca, 0x1cce, 0x4195,
drivers/thunderbolt/test.c-2665- 0xbd, 0xb8, 0x49, 0x59, 0x2e, 0x5f, 0x5a, 0x4f);
--
drivers/thunderbolt/test.c=2868=static void tb_test_property_parse_u32_wrap(struct kunit *test)
--
drivers/thunderbolt/test.c-2880-
drivers/thunderbolt/test.c:2881: block[0] = 0x55584401; /* "UXD" v1 magic */
drivers/thunderbolt/test.c-2882- block[1] = 0x00000004; /* Root directory length: one entry */
--
drivers/thunderbolt/test.c-2884- /*
drivers/thunderbolt/test.c:2885: * DATA entry whose value 0xffffff00 + length 0x100 wrap to 0
drivers/thunderbolt/test.c-2886- * in u32, passing the sum <= block_len guard even though the
--
drivers/thunderbolt/test.c-2888- */
drivers/thunderbolt/test.c:2889: block[2] = 0x61616161; /* key_hi */
drivers/thunderbolt/test.c:2890: block[3] = 0x61616161; /* key_lo */
drivers/thunderbolt/test.c:2891: block[4] = 0x64000100; /* type=DATA, reserved=0, length=0x100 */
drivers/thunderbolt/test.c:2892: block[5] = 0xffffff00; /* value */
drivers/thunderbolt/test.c-2893-
--
drivers/thunderbolt/test.c=2899=static void tb_test_property_parse_recursion(struct kunit *test)
--
drivers/thunderbolt/test.c-2912-
drivers/thunderbolt/test.c:2913: block[0] = 0x55584401; /* "UXD" v1 magic */
drivers/thunderbolt/test.c-2914- block[1] = 0x00000004; /* Root directory length: one entry */
--
drivers/thunderbolt/test.c-2923- */
drivers/thunderbolt/test.c:2924: block[2] = 0x61616161; /* key_hi */
drivers/thunderbolt/test.c:2925: block[3] = 0x61616161; /* key_lo */
drivers/thunderbolt/test.c:2926: block[4] = 0x44000008; /* type=DIRECTORY, reserved=0, length=8 */
drivers/thunderbolt/test.c-2927- block[5] = 0x00000002; /* value = dir_offset */
drivers/thunderbolt/test.c-2928-
drivers/thunderbolt/test.c:2929: block[6] = 0x62626262; /* doubles as UUID dword 0 / child key_hi */
drivers/thunderbolt/test.c:2930: block[7] = 0x62626262; /* doubles as UUID dword 1 / child key_lo */
drivers/thunderbolt/test.c:2931: block[8] = 0x44000008; /* type=DIRECTORY, reserved=0, length=8 */
drivers/thunderbolt/test.c-2932- block[9] = 0x00000002; /* value = dir_offset (back at parent) */
--
drivers/thunderbolt/test.c=2939=static void tb_test_property_parse_dir_len_underflow(struct kunit *test)
--
drivers/thunderbolt/test.c-2957-
drivers/thunderbolt/test.c:2958: block[0] = 0x55584401; /* "UXD" v1 magic */
drivers/thunderbolt/test.c-2959- block[1] = 0x00000004; /* Root directory length: one entry */
--
drivers/thunderbolt/test.c-2967- */
drivers/thunderbolt/test.c:2968: block[2] = 0x61616161; /* key_hi */
drivers/thunderbolt/test.c:2969: block[3] = 0x61616161; /* key_lo */
drivers/thunderbolt/test.c:2970: block[4] = 0x44000003; /* type=DIRECTORY, reserved=0, length=3 */
drivers/thunderbolt/test.c-2971- block[5] = 0x00000004; /* value = dir_offset */
--
drivers/thunderbolt/test.c=2979=static void tb_test_property_parse_zero_length(struct kunit *test)
--
drivers/thunderbolt/test.c-2985-
drivers/thunderbolt/test.c:2986: block[0] = 0x55584401; /* rootdir magic */
drivers/thunderbolt/test.c-2987- block[1] = 0x00000004; /* root length: one entry */
drivers/thunderbolt/test.c-2988-
drivers/thunderbolt/test.c:2989: block[2] = 0x61616161; /* key_hi */
drivers/thunderbolt/test.c:2990: block[3] = 0x61616161; /* key_lo */
drivers/thunderbolt/test.c:2991: block[4] = 0x74000000; /* type=TEXT, reserved=0, length=0 */
drivers/thunderbolt/test.c-2992- block[5] = 0x00000000; /* value */
--
drivers/thunderbolt/test.c=2999=static void tb_test_property_parse_rootdir_overflow(struct kunit *test)
--
drivers/thunderbolt/test.c-3005-
drivers/thunderbolt/test.c:3006: block[0] = 0x55584401; /* rootdir magic */
drivers/thunderbolt/test.c-3007- block[1] = 0x00000004; /* root length claims 4 dwords of content */
drivers/thunderbolt/test.c:3008: block[2] = 0x61616161;
drivers/thunderbolt/test.c:3009: block[3] = 0x61616161;
drivers/thunderbolt/test.c-3010-
--
drivers/thunderbolt/tmu.c=447=int tb_switch_tmu_post_time(struct tb_switch *sw)
--
drivers/thunderbolt/tmu.c-502- * Have the new switch update its local time by:
drivers/thunderbolt/tmu.c:503: * 1) writing 0x1 to the Post Time Low register and 0xffffffff to
drivers/thunderbolt/tmu.c-504- * Post Time High register.
--
drivers/thunderbolt/tmu.c-508- */
drivers/thunderbolt/tmu.c:509: post_time = 0xffffffff00000001ULL;
drivers/thunderbolt/tmu.c-510-
--
drivers/thunderbolt/xdomain.c=81=static const uuid_t tb_xdp_uuid =
drivers/thunderbolt/xdomain.c:82: UUID_INIT(0xb638d70e, 0x42ff, 0x40bb,
drivers/thunderbolt/xdomain.c-83- 0x97, 0xc2, 0x90, 0xe2, 0xc0, 0xb2, 0xff, 0x07);
--
drivers/thunderbolt/xdomain.c=2748=int tb_xdomain_init(void)
--
drivers/thunderbolt/xdomain.c-2764- tb_property_add_immediate(xdomain_property_dir, "deviceid", 0x0004);
drivers/thunderbolt/xdomain.c:2765: tb_property_add_immediate(xdomain_property_dir, "devicerv", 0x80000100);
drivers/thunderbolt/xdomain.c-2766-
]
|
| 92/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 23006
output: 29
thoughts: 535
Thoughts: **My Investigation into Thunderbolt NHI Register Offsets**
Initially, my understanding was that the values I was seeing weren't directly register offsets. This led me to hypothesize that the actual register offsets might be defined elsewhere, so I decided to search for `0x39` and other potential offsets within `drivers/thunderbolt/nhi.c` and related files. However, upon revisiting `drivers/thunderbolt/nhi_regs.h`, I meticulously reviewed the defined registers. My findings here were:
* `REG_TX_RING_BASE`: `0x00000`
* `REG_RX_RING_BASE`: `0x08000`
* `REG_TX_OPTIONS_BASE`: `0x19800`
* `REG_RX_OPTIONS_BASE`: `0x29800`
* `REG_RING_NOTIFY_BASE`: `0x37800`
* `REG_RING_INT_CLEAR`: `0x37808`
* `REG_RING_INTERRUPT_BASE`: `0x38200`
* `REG_RING_INTERRUPT_MASK_CLEAR_BASE`: `0x38208`
* `REG_INT_THROTTLING_RATE`: `0x38c00`
* `REG_INT_VEC_ALLOC_BASE`: `0x38c40`
* `REG_CAPS`: `0x39640`
* `REG_DMA_MISC`: `0x39864`
* `REG_RESET`: `0x39898`
* `REG_INMAIL_DATA`: `0x39900`
* `REG_INMAIL_CMD`: `0x39904`
* `REG_OUTMAIL_CMD`: `0x3990c`
* `REG_FW_STS`: `0x39944`
After confirming that I had examined the entire `nhi_regs.h` file and that no other registers were defined within it, my next thought was to consider whether the NHI driver might be interacting with registers defined in *other* header files. Specifically, I began to wonder if the NHI driver accesses registers defined in `drivers/thunderbolt/tb_regs.h`. To investigate this, I planned to search for any references to `tb_regs.h` within `drivers/thunderbolt/nhi.c` and other files in that directory, essentially performing a grep operation for `tb_regs.h` within the `drivers/thunderbolt/` path.
|
| 93/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Args: map[Expression:tb_regs\.h PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/dma_port.c-13-#include "dma_port.h"
drivers/thunderbolt/dma_port.c:14:#include "tb_regs.h"
drivers/thunderbolt/dma_port.c-15-
--
drivers/thunderbolt/tb.c-15-#include "tb.h"
drivers/thunderbolt/tb.c:16:#include "tb_regs.h"
drivers/thunderbolt/tb.c-17-#include "tunnel.h"
--
drivers/thunderbolt/tb.h-18-
drivers/thunderbolt/tb.h:19:#include "tb_regs.h"
drivers/thunderbolt/tb.h-20-#include "ctl.h"
]
|
| 94/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 23747
output: 35
thoughts: 55
Thoughts: **My Thought Process on the `nhi.c` Inclusion Issue**
Okay, I've just been looking at `nhi.c`, and a potential issue has immediately jumped out at me. I'm realizing that `nhi.c` *doesn't* appear to include `tb_regs.h`. This is a bit concerning, given the nature of the code.
My immediate next step is to confirm my suspicion and understand the scope of this potential problem. To do that, I need to see if `nhi.c` is including *any* register definition files at all. My instinct is to go straight to the source, so I'm going to pull up and examine the very top of the `drivers/thunderbolt/nhi.c` file. This will give me a clear picture of its direct dependencies and whether it's relying on external definitions for register access.
|
| 95/4 |
2026/08/10 08:30 |
tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi.c FirstLine:1 LineCount:40]
Results: map[Contents: 1: // SPDX-License-Identifier: GPL-2.0-only
2: /*
3: * Thunderbolt driver - NHI driver
4: *
5: * The NHI (native host interface) is the device that allows us to send and
6: * receive frames from the thunderbolt bus.
7: *
8: * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
9: * Copyright (C) 2018, Intel Corporation
10: */
11:
12: #include <linux/pm_runtime.h>
13: #include <linux/slab.h>
14: #include <linux/errno.h>
15: #include <linux/dma-mapping.h>
16: #include <linux/interrupt.h>
17: #include <linux/iommu.h>
18: #include <linux/module.h>
19: #include <linux/delay.h>
20: #include <linux/property.h>
21: #include <linux/string_choices.h>
22: #include <linux/string_helpers.h>
23:
24: #include "nhi.h"
25: #include "nhi_regs.h"
26: #include "tb.h"
27:
28: #define RING_TYPE(ring) ((ring)->is_tx ? "TX ring" : "RX ring")
29:
30: #define RING_FIRST_USABLE_HOPID 1
31: /*
32: * Used with QUIRK_E2E to specify an unused HopID the Rx credits are
33: * transferred.
34: */
35: #define RING_E2E_RESERVED_HOPID RING_FIRST_USABLE_HOPID
36:
37: #define NHI_MAILBOX_TIMEOUT 500 /* ms */
38:
39: static bool host_reset = true;
40: module_param(host_reset, bool, 0444);
]
|
| 96/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 24415
output: 36
thoughts: 59
Thoughts: **My Thought Process on Investigating NHI Driver Files**
My initial reaction upon encountering the NHI driver was a strong impulse to ensure I had a comprehensive understanding of its scope within the `drivers/thunderbolt/` directory. I immediately considered the possibility of other files besides the one I was directly examining that might also be intrinsically linked to the NHI driver or, crucially, directly interact with its underlying registers. This isn't just about checking for related files; it's about identifying all the pieces of the puzzle that constitute the NHI driver's implementation and its hardware interface.
Following this line of reasoning, my next logical step was to delve into `drivers/thunderbolt/nhi.h`. My reasoning here is straightforward: header files, especially those named like `nhi.h` in this context, are typically where key definitions, structures, enumerations, and function prototypes related to a specific module reside. By examining `nhi.h`, I expect to gain immediate insight into the public interface of the NHI driver, understand the data structures it employs, and potentially identify the register definitions themselves. This would be the foundational step in grasping how other parts of the driver, or even external code, would communicate with and control the NHI hardware.
|
| 97/4 |
2026/08/10 08:30 |
tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi.h FirstLine:1 LineCount:100]
Results: map[Contents: 1: /* SPDX-License-Identifier: GPL-2.0 */
2: /*
3: * Thunderbolt driver - NHI driver
4: *
5: * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6: * Copyright (C) 2018, Intel Corporation
7: */
8:
9: #ifndef DSL3510_H_
10: #define DSL3510_H_
11:
12: #include <linux/thunderbolt.h>
13:
14: enum nhi_fw_mode {
15: NHI_FW_SAFE_MODE,
16: NHI_FW_AUTH_MODE,
17: NHI_FW_EP_MODE,
18: NHI_FW_CM_MODE,
19: };
20:
21: enum nhi_mailbox_cmd {
22: NHI_MAILBOX_SAVE_DEVS = 0x05,
23: NHI_MAILBOX_DISCONNECT_PCIE_PATHS = 0x06,
24: NHI_MAILBOX_DRV_UNLOADS = 0x07,
25: NHI_MAILBOX_DISCONNECT_PA = 0x10,
26: NHI_MAILBOX_DISCONNECT_PB = 0x11,
27: NHI_MAILBOX_ALLOW_ALL_DEVS = 0x23,
28: };
29:
30: int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data);
31: enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi);
32: void nhi_enable_int_throttling(struct tb_nhi *nhi);
33: void nhi_disable_interrupts(struct tb_nhi *nhi);
34: void nhi_interrupt_work(struct work_struct *work);
35: irqreturn_t nhi_msi(int irq, void *data);
36: irqreturn_t ring_msix(int irq, void *data);
37: int nhi_probe(struct tb_nhi *nhi);
38: void nhi_shutdown(struct tb_nhi *nhi);
39: extern const struct dev_pm_ops nhi_pm_ops;
40:
41: /**
42: * struct tb_nhi_ops - NHI specific optional operations
43: * @init: NHI specific initialization
44: * @suspend_noirq: NHI specific suspend_noirq hook
45: * @resume_noirq: NHI specific resume_noirq hook
46: * @runtime_suspend: NHI specific runtime_suspend hook
47: * @runtime_resume: NHI specific runtime_resume hook
48: * @shutdown: NHI specific shutdown
49: * @pre_nvm_auth: hook to run before Thunderbolt 3 NVM authentication
50: * @post_nvm_auth: hook to run after Thunderbolt 3 NVM authentication
51: * @request_ring_irq: NHI specific interrupt retrieval hook
52: * @release_ring_irq: NHI specific interrupt release hook
53: * @is_present: Whether the device is currently present on the parent bus
54: * @init_interrupts: NHI specific interrupt initialization hook
55: */
56: struct tb_nhi_ops {
57: int (*init)(struct tb_nhi *nhi);
58: int (*suspend_noirq)(struct tb_nhi *nhi, bool wakeup);
59: int (*resume_noirq)(struct tb_nhi *nhi);
60: int (*runtime_suspend)(struct tb_nhi *nhi);
61: int (*runtime_resume)(struct tb_nhi *nhi);
62: void (*shutdown)(struct tb_nhi *nhi);
63: void (*pre_nvm_auth)(struct tb_nhi *nhi);
64: void (*post_nvm_auth)(struct tb_nhi *nhi);
65: int (*request_ring_irq)(struct tb_ring *ring, bool no_suspend);
66: void (*release_ring_irq)(struct tb_ring *ring);
67: bool (*is_present)(struct tb_nhi *nhi);
68: int (*init_interrupts)(struct tb_nhi *nhi);
69: };
70:
71: /*
72: * PCI IDs used in this driver from Win Ridge forward. There is no
73: * need for the PCI quirk anymore as we will use ICM also on Apple
74: * hardware.
75: */
76: #define PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_2C_NHI 0x1134
77: #define PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_4C_NHI 0x1137
78: #define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI 0x157d
79: #define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE 0x157e
80: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI 0x15bf
81: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE 0x15c0
82: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI 0x15d2
83: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE 0x15d3
84: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI 0x15d9
85: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE 0x15da
86: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI 0x15dc
87: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI 0x15dd
88: #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI 0x15de
89: #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE 0x15e7
90: #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_NHI 0x15e8
91: #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE 0x15ea
92: #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_NHI 0x15eb
93: #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE 0x15ef
94: #define PCI_DEVICE_ID_INTEL_ADL_NHI0 0x463e
95: #define PCI_DEVICE_ID_INTEL_ADL_NHI1 0x466d
96: #define PCI_DEVICE_ID_INTEL_WCL_NHI0 0x4d33
97: #define PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HOST_80G_NHI 0x5781
98: #define PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HOST_40G_NHI 0x5784
99: #define PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HUB_80G_BRIDGE 0x5786
100: #define PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HUB_40G_BRIDGE 0x57a4
]
|
| 98/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 26671
output: 37
thoughts: 18
Thoughts: **My Thought Process Regarding `drivers/thunderbolt/nhi.h`**
Alright, so after digging into the broader Thunderbolt driver architecture, I've now arrived at the point where I need to understand the specifics of the NHI (Native Host Interface) layer. My immediate inclination is to dive into `drivers/thunderbolt/nhi.h`. I expect this header file to be the lynchpin for understanding how the higher-level Thunderbolt protocol interacts with the underlying hardware controller.
My objective here is to meticulously dissect what `nhi.h` exposes and defines. I'll be looking for key data structures that represent the NHI's internal state and the hardware itself. I'm particularly interested in the API – the functions, macros, and constants that the rest of the Thunderbolt driver stack will use to communicate with the NHI. This is where the abstraction happens; I need to grasp how the complex world of Thunderbolt operations (like tunneling, link management, and device enumeration) is translated into concrete commands and data exchanges through this interface.
Furthermore, I'll be scrutinizing the definitions related to error handling and status reporting. How does the NHI signal events, failures, or successful operations back to the driver? Understanding these mechanisms is crucial for building a robust and reliable Thunderbolt subsystem. I anticipate seeing definitions for various states, capabilities, and perhaps even specific register layouts or memory-mapped I/O regions that the driver will need to manipulate. Essentially, this header file should serve as the blueprint for interacting with the NHI component of the Thunderbolt controller. It's the contract between the software driver and the hardware's native interface, and comprehending it is paramount to understanding how Thunderbolt is managed at this fundamental level.
|
| 99/4 |
2026/08/10 08:30 |
tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi.h FirstLine:101 LineCount:50]
Results: map[Contents: 101: #define PCI_DEVICE_ID_INTEL_MTL_M_NHI0 0x7eb2
102: #define PCI_DEVICE_ID_INTEL_MTL_P_NHI0 0x7ec2
103: #define PCI_DEVICE_ID_INTEL_MTL_P_NHI1 0x7ec3
104: #define PCI_DEVICE_ID_INTEL_ICL_NHI1 0x8a0d
105: #define PCI_DEVICE_ID_INTEL_ICL_NHI0 0x8a17
106: #define PCI_DEVICE_ID_INTEL_TGL_NHI0 0x9a1b
107: #define PCI_DEVICE_ID_INTEL_TGL_NHI1 0x9a1d
108: #define PCI_DEVICE_ID_INTEL_TGL_H_NHI0 0x9a1f
109: #define PCI_DEVICE_ID_INTEL_TGL_H_NHI1 0x9a21
110: #define PCI_DEVICE_ID_INTEL_RPL_NHI0 0xa73e
111: #define PCI_DEVICE_ID_INTEL_RPL_NHI1 0xa76d
112: #define PCI_DEVICE_ID_INTEL_LNL_NHI0 0xa833
113: #define PCI_DEVICE_ID_INTEL_LNL_NHI1 0xa834
114: #define PCI_DEVICE_ID_INTEL_PTL_M_NHI0 0xe333
115: #define PCI_DEVICE_ID_INTEL_PTL_M_NHI1 0xe334
116: #define PCI_DEVICE_ID_INTEL_PTL_P_NHI0 0xe433
117: #define PCI_DEVICE_ID_INTEL_PTL_P_NHI1 0xe434
118:
119: #define PCI_CLASS_SERIAL_USB_USB4 0x0c0340
120:
121: /* Host interface quirks */
122: #define QUIRK_AUTO_CLEAR_INT BIT(0)
123: #define QUIRK_E2E BIT(1)
124:
125: /*
126: * Minimal number of vectors when we use MSI-X. Two for control channel
127: * Rx/Tx and the rest four are for cross domain DMA paths.
128: */
129: #define MSIX_MIN_VECS 6
130: #define MSIX_MAX_VECS 16
131:
132: #endif
]
|
| 100/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 27476
output: 30
thoughts: 68
Thoughts: **My Internal Monologue:**
Okay, so I've been examining the Thunderbolt driver, specifically looking at NHI operations. My immediate thought is to ensure I have a complete picture of how these operations are handled. It's not enough to just look at one file; I need to be absolutely certain I'm not missing any crucial implementations or related components. Therefore, my next step is to systematically search the `drivers/thunderbolt/` directory for any other files that might be involved. My primary search terms will be `struct tb_nhi_ops` and the more general `nhi_ops`. This way, I can identify any other structures or functions that define or utilize NHI operations, giving me a comprehensive understanding of the NHI driver's architecture and how it's integrated within the broader Thunderbolt subsystem.
|
| 101/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Args: map[Expression:tb_nhi_ops PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/nhi.h=39=extern const struct dev_pm_ops nhi_pm_ops;
--
drivers/thunderbolt/nhi.h-41-/**
drivers/thunderbolt/nhi.h:42: * struct tb_nhi_ops - NHI specific optional operations
drivers/thunderbolt/nhi.h-43- * @init: NHI specific initialization
--
drivers/thunderbolt/nhi.h-55- */
drivers/thunderbolt/nhi.h:56:struct tb_nhi_ops {
drivers/thunderbolt/nhi.h-57- int (*init)(struct tb_nhi *nhi);
--
drivers/thunderbolt/pci.c=249=static bool nhi_pci_is_present(struct tb_nhi *nhi)
--
drivers/thunderbolt/pci.c-253-
drivers/thunderbolt/pci.c:254:static const struct tb_nhi_ops pci_nhi_default_ops = {
drivers/thunderbolt/pci.c-255- .pre_nvm_auth = nhi_pci_start_dma_port,
--
drivers/thunderbolt/pci.c=425=static void icl_nhi_shutdown(struct tb_nhi *nhi)
--
drivers/thunderbolt/pci.c-431-
drivers/thunderbolt/pci.c:432:static const struct tb_nhi_ops icl_nhi_ops = {
drivers/thunderbolt/pci.c-433- .init = icl_nhi_resume,
--
drivers/thunderbolt/pci.c=447=static int nhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
--
drivers/thunderbolt/pci.c-466- nhi->dev = dev;
drivers/thunderbolt/pci.c:467: nhi->ops = (const struct tb_nhi_ops *)id->driver_data ?: &pci_nhi_default_ops;
drivers/thunderbolt/pci.c-468-
]
|
| 102/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 28104
output: 43
thoughts: 121
Thoughts: **My Thought Process on Exploring Thunderbolt PCI Driver Register Access**
My immediate impulse upon encountering `drivers/thunderbolt/pci.c` and noting the presence of `pci_nhi_default_ops` and `icl_nhi_ops` is to delve into the specifics of how these operations interact with the hardware. As an expert in this domain, I understand that the true essence of driver functionality often lies in the direct manipulation of hardware registers. Therefore, my primary objective becomes uncovering any register read or write operations within this particular file. I'm particularly keen to identify *which* registers are being accessed and their precise memory-mapped offsets. To efficiently achieve this, I'll leverage a powerful searching tool like `grepper`. My search query will specifically target patterns indicative of register access: `ioread`, `iowrite`, `readl`, `writel`, and any explicit register offset values. This targeted approach will allow me to quickly pinpoint the critical low-level interactions within the Thunderbolt PCI driver.
|
| 103/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Error:
Args: map[Expression:(readl|writel|ioread|iowrite) PathPrefix:drivers/thunderbolt/pci.c]
Results:
|
| 104/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 28266
output: 37
thoughts: 125
Thoughts: **My Investigation into Thunderbolt PCI Register Access**
My initial scan for specific I/O access functions like `readl`, `writel`, `ioread`, and `iowrite` within `drivers/thunderbolt/pci.c` yielded no results. This immediately raised a question in my mind: how is register access actually being performed in this critical driver file? My next step was to broaden my search, specifically looking for the more generic PCI configuration space access mechanisms. I hypothesized that it was likely using the standard `pci_read_config` and `pci_write_config` functions, or their variants like `pci_read_config_dword`. Therefore, I decided to search `drivers/thunderbolt/pci.c` for these common PCI configuration access patterns to understand the underlying register manipulation.
|
| 105/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Args: map[Expression:pci_(read|write)_config PathPrefix:drivers/thunderbolt/pci.c]
Results: map[Output:drivers/thunderbolt/pci.c=283=static int icl_nhi_force_power(struct tb_nhi *nhi, bool power)
--
drivers/thunderbolt/pci.c-299- */
drivers/thunderbolt/pci.c:300: pci_read_config_dword(pdev, VS_CAP_22, &vs_cap);
drivers/thunderbolt/pci.c-301- if (power) {
--
drivers/thunderbolt/pci.c-307- }
drivers/thunderbolt/pci.c:308: pci_write_config_dword(pdev, VS_CAP_22, vs_cap);
drivers/thunderbolt/pci.c-309-
--
drivers/thunderbolt/pci.c-315- do {
drivers/thunderbolt/pci.c:316: pci_read_config_dword(pdev, VS_CAP_9, &val);
drivers/thunderbolt/pci.c-317- if (val & VS_CAP_9_FW_READY)
--
drivers/thunderbolt/pci.c=328=static void icl_nhi_lc_mailbox_cmd(struct tb_nhi *nhi, enum icl_lc_mailbox_cmd cmd)
--
drivers/thunderbolt/pci.c-333- data = (cmd << VS_CAP_19_CMD_SHIFT) & VS_CAP_19_CMD_MASK;
drivers/thunderbolt/pci.c:334: pci_write_config_dword(pdev, VS_CAP_19, data | VS_CAP_19_VALID);
drivers/thunderbolt/pci.c-335-}
--
drivers/thunderbolt/pci.c=337=static int icl_nhi_lc_mailbox_cmd_complete(struct tb_nhi *nhi, int timeout)
--
drivers/thunderbolt/pci.c-347- do {
drivers/thunderbolt/pci.c:348: pci_read_config_dword(pdev, VS_CAP_18, &data);
drivers/thunderbolt/pci.c-349- if (data & VS_CAP_18_DONE)
--
drivers/thunderbolt/pci.c-357- /* Clear the valid bit */
drivers/thunderbolt/pci.c:358: pci_write_config_dword(pdev, VS_CAP_19, 0);
drivers/thunderbolt/pci.c-359- return 0;
--
drivers/thunderbolt/pci.c=362=static void icl_nhi_set_ltr(struct tb_nhi *nhi)
--
drivers/thunderbolt/pci.c-366-
drivers/thunderbolt/pci.c:367: pci_read_config_dword(pdev, VS_CAP_16, &max_ltr);
drivers/thunderbolt/pci.c-368- max_ltr &= 0xffff;
--
drivers/thunderbolt/pci.c-370- ltr = max_ltr << 16 | max_ltr;
drivers/thunderbolt/pci.c:371: pci_write_config_dword(pdev, VS_CAP_15, ltr);
drivers/thunderbolt/pci.c-372-}
]
|
| 106/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 29279
output: 31
thoughts: 497
Thoughts: **My Thought Process Regarding Thunderbolt NIC Register Access**
Initially, my attention was drawn to a set of registers I recognized as being part of the PCI configuration space. I know these are typically accessed using functions like `pci_read_config_dword` and `pci_write_config_dword`. I quickly noted down the specific offsets: `VS_CAP_22` at `0xfc`, `VS_CAP_9` at `0xc8`, `VS_CAP_19` at `0xf0`, `VS_CAP_18` at `0xec`, `VS_CAP_16` at `0xe4`, and `VS_CAP_15` at `0xe0`. It's significant to me that all these fall within the standard PCI configuration space, which is a relatively small address range and notably smaller than `0x39640`.
This led me to question whether there were *other* registers or files within the Thunderbolt NIC driver that might be involved in register access. My next step was to revisit `drivers/thunderbolt/nhi_regs.h`. I specifically wanted to examine registers defined there that had offsets *greater* than `0x39640`, which I identified as `REG_CAPS`. The ones that stood out were: `REG_DMA_MISC` at `0x39864`, `REG_RESET` at `0x39898`, `REG_INMAIL_DATA` at `0x39900`, `REG_INMAIL_CMD` at `0x39904`, `REG_OUTMAIL_CMD` at `0x3990c`, and `REG_FW_STS` at `0x39944`.
My investigation didn't stop there. I continued to ponder if there were *any* other registers accessed by the Thunderbolt NIC driver beyond those already examined. This prompted me to broaden my scope and look for other files within the `drivers/thunderbolt/` directory that might be involved in register access. My focus then shifted to `drivers/thunderbolt/icm.c`. I recalled seeing this file interact with `REG_FW_STS` (which is at `0x39944`). To deepen my understanding, I decided to thoroughly check `icm.c` for any *other* registers it might be accessing. As a practical approach, I decided to search for patterns like `nhi->iobase` or simply `iobase` within `drivers/thunderbolt/icm.c` to uncover potential register accesses.
|
| 107/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Args: map[Expression:iobase PathPrefix:drivers/thunderbolt/icm.c]
Results: map[Output:drivers/thunderbolt/icm.c=375=static bool icm_firmware_running(const struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-378-
drivers/thunderbolt/icm.c:379: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-380- return !!(val & REG_FW_STS_ICM_EN);
--
drivers/thunderbolt/icm.c=1509=static int icm_ar_get_mode(struct tb *tb)
--
drivers/thunderbolt/icm.c-1515- do {
drivers/thunderbolt/icm.c:1516: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1517- if (val & REG_FW_STS_NVM_AUTH_DONE)
--
drivers/thunderbolt/icm.c=1719=static bool icm_tgl_is_supported(struct tb *tb)
--
drivers/thunderbolt/icm.c-1725-
drivers/thunderbolt/icm.c:1726: val = ioread32(tb->nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1727- if (val & REG_FW_STS_NVM_AUTH_DONE)
--
drivers/thunderbolt/icm.c=1837=static int icm_firmware_reset(struct tb *tb, struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-1845- /* Put ARC to wait for CIO reset event to happen */
drivers/thunderbolt/icm.c:1846: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1847- val |= REG_FW_STS_CIO_RESET_REQ;
drivers/thunderbolt/icm.c:1848: iowrite32(val, nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1849-
drivers/thunderbolt/icm.c-1850- /* Re-start ARC */
drivers/thunderbolt/icm.c:1851: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1852- val |= REG_FW_STS_ICM_EN_INVERT;
drivers/thunderbolt/icm.c-1853- val |= REG_FW_STS_ICM_EN_CPU;
drivers/thunderbolt/icm.c:1854: iowrite32(val, nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1855-
--
drivers/thunderbolt/icm.c=1860=static int icm_firmware_start(struct tb *tb, struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-1878- /* Check that the ICM firmware is running */
drivers/thunderbolt/icm.c:1879: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1880- if (val & REG_FW_STS_NVM_AUTH_DONE)
]
|
| 108/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 30686
output: 26
thoughts: 62
Thoughts: **My Thought Process on Thunderbolt Register Access**
Alright, so I've just confirmed that `icm.c` is exclusively interacting with `REG_FW_STS`, which corresponds to memory address `0x39944`. This is a very specific and narrow observation. My next logical step, given this focused finding, is to broaden my search within the immediate vicinity of this code. I need to determine if this isolated access to `REG_FW_STS` is a solitary event, or if it's part of a larger pattern of register manipulation within the `drivers/thunderbolt/` directory. To do this, I'm going to systematically examine all other files within that directory, specifically looking for any instances where `nhi->iobase` or the standalone `iobase` variable is being accessed. This will tell me if the Thunderbolt driver as a whole uses a more generalized approach to I/O base addressing, or if `REG_FW_STS` is indeed accessed in a unique manner by `icm.c`.
|
| 109/4 |
2026/08/10 08:30 |
tool |
grepper |
0m
Args: map[Expression:iobase PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/icm.c=375=static bool icm_firmware_running(const struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-378-
drivers/thunderbolt/icm.c:379: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-380- return !!(val & REG_FW_STS_ICM_EN);
--
drivers/thunderbolt/icm.c=1509=static int icm_ar_get_mode(struct tb *tb)
--
drivers/thunderbolt/icm.c-1515- do {
drivers/thunderbolt/icm.c:1516: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1517- if (val & REG_FW_STS_NVM_AUTH_DONE)
--
drivers/thunderbolt/icm.c=1719=static bool icm_tgl_is_supported(struct tb *tb)
--
drivers/thunderbolt/icm.c-1725-
drivers/thunderbolt/icm.c:1726: val = ioread32(tb->nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1727- if (val & REG_FW_STS_NVM_AUTH_DONE)
--
drivers/thunderbolt/icm.c=1837=static int icm_firmware_reset(struct tb *tb, struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-1845- /* Put ARC to wait for CIO reset event to happen */
drivers/thunderbolt/icm.c:1846: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1847- val |= REG_FW_STS_CIO_RESET_REQ;
drivers/thunderbolt/icm.c:1848: iowrite32(val, nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1849-
drivers/thunderbolt/icm.c-1850- /* Re-start ARC */
drivers/thunderbolt/icm.c:1851: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1852- val |= REG_FW_STS_ICM_EN_INVERT;
drivers/thunderbolt/icm.c-1853- val |= REG_FW_STS_ICM_EN_CPU;
drivers/thunderbolt/icm.c:1854: iowrite32(val, nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1855-
--
drivers/thunderbolt/icm.c=1860=static int icm_firmware_start(struct tb *tb, struct tb_nhi *nhi)
--
drivers/thunderbolt/icm.c-1878- /* Check that the ICM firmware is running */
drivers/thunderbolt/icm.c:1879: val = ioread32(nhi->iobase + REG_FW_STS);
drivers/thunderbolt/icm.c-1880- if (val & REG_FW_STS_NVM_AUTH_DONE)
--
drivers/thunderbolt/nhi.c=51=static void nhi_mask_interrupt(struct tb_nhi *nhi, int mask, int ring)
--
drivers/thunderbolt/nhi.c-55-
drivers/thunderbolt/nhi.c:56: val = ioread32(nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
drivers/thunderbolt/nhi.c:57: iowrite32(val & ~mask, nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
drivers/thunderbolt/nhi.c-58- } else {
drivers/thunderbolt/nhi.c:59: iowrite32(mask, nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring);
drivers/thunderbolt/nhi.c-60- }
--
drivers/thunderbolt/nhi.c=63=static void nhi_clear_interrupt(struct tb_nhi *nhi, int ring)
--
drivers/thunderbolt/nhi.c-65- if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
drivers/thunderbolt/nhi.c:66: ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + ring);
drivers/thunderbolt/nhi.c-67- else
drivers/thunderbolt/nhi.c:68: iowrite32(~0, nhi->iobase + REG_RING_INT_CLEAR + ring);
drivers/thunderbolt/nhi.c-69-}
--
drivers/thunderbolt/nhi.c=76=static void ring_interrupt_active(struct tb_ring *ring, bool active)
--
drivers/thunderbolt/nhi.c-105- */
drivers/thunderbolt/nhi.c:106: misc = ioread32(ring->nhi->iobase + REG_DMA_MISC);
drivers/thunderbolt/nhi.c-107- if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT)
--
drivers/thunderbolt/nhi.c-112- iowrite32(misc | auto_clear_bit,
drivers/thunderbolt/nhi.c:113: ring->nhi->iobase + REG_DMA_MISC);
drivers/thunderbolt/nhi.c-114-
drivers/thunderbolt/nhi.c:115: ivr_base = ring->nhi->iobase + REG_INT_VEC_ALLOC_BASE;
drivers/thunderbolt/nhi.c-116- step = index / REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
--
drivers/thunderbolt/nhi.c-126- itr &= REG_INT_THROTTLING_RATE_INTERVAL_MASK;
drivers/thunderbolt/nhi.c:127: iowrite32(itr, ring->nhi->iobase + REG_INT_THROTTLING_RATE +
drivers/thunderbolt/nhi.c-128- ring->vector * 4);
--
drivers/thunderbolt/nhi.c-130-
drivers/thunderbolt/nhi.c:131: old = ioread32(ring->nhi->iobase + reg);
drivers/thunderbolt/nhi.c-132- if (active)
--
drivers/thunderbolt/nhi.c-146- if (active)
drivers/thunderbolt/nhi.c:147: iowrite32(new, ring->nhi->iobase + reg);
drivers/thunderbolt/nhi.c-148- else
--
drivers/thunderbolt/nhi.c=171=static void __iomem *ring_desc_base(struct tb_ring *ring)
drivers/thunderbolt/nhi.c-172-{
drivers/thunderbolt/nhi.c:173: void __iomem *io = ring->nhi->iobase;
drivers/thunderbolt/nhi.c-174- io += ring->is_tx ? REG_TX_RING_BASE : REG_RX_RING_BASE;
--
drivers/thunderbolt/nhi.c=179=static void __iomem *ring_options_base(struct tb_ring *ring)
drivers/thunderbolt/nhi.c-180-{
drivers/thunderbolt/nhi.c:181: void __iomem *io = ring->nhi->iobase;
drivers/thunderbolt/nhi.c-182- io += ring->is_tx ? REG_TX_OPTIONS_BASE : REG_RX_OPTIONS_BASE;
--
drivers/thunderbolt/nhi.c=380=static void __ring_interrupt_mask(struct tb_ring *ring, bool mask)
--
drivers/thunderbolt/nhi.c-386-
drivers/thunderbolt/nhi.c:387: val = ioread32(ring->nhi->iobase + reg);
drivers/thunderbolt/nhi.c-388- if (mask)
--
drivers/thunderbolt/nhi.c-391- val |= BIT(bit);
drivers/thunderbolt/nhi.c:392: iowrite32(val, ring->nhi->iobase + reg);
drivers/thunderbolt/nhi.c-393-}
--
drivers/thunderbolt/nhi.c=429=static void ring_clear_msix(const struct tb_ring *ring)
--
drivers/thunderbolt/nhi.c-437- if (ring->is_tx)
drivers/thunderbolt/nhi.c:438: iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR);
drivers/thunderbolt/nhi.c-439- else
drivers/thunderbolt/nhi.c:440: iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR +
drivers/thunderbolt/nhi.c-441- 4 * (ring->nhi->hop_count / 32));
--
drivers/thunderbolt/nhi.c=870=int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data)
--
drivers/thunderbolt/nhi.c-874-
drivers/thunderbolt/nhi.c:875: iowrite32(data, nhi->iobase + REG_INMAIL_DATA);
drivers/thunderbolt/nhi.c-876-
drivers/thunderbolt/nhi.c:877: val = ioread32(nhi->iobase + REG_INMAIL_CMD);
drivers/thunderbolt/nhi.c-878- val &= ~(REG_INMAIL_CMD_MASK | REG_INMAIL_ERROR);
drivers/thunderbolt/nhi.c-879- val |= REG_INMAIL_OP_REQUEST | cmd;
drivers/thunderbolt/nhi.c:880: iowrite32(val, nhi->iobase + REG_INMAIL_CMD);
drivers/thunderbolt/nhi.c-881-
--
drivers/thunderbolt/nhi.c-883- do {
drivers/thunderbolt/nhi.c:884: val = ioread32(nhi->iobase + REG_INMAIL_CMD);
drivers/thunderbolt/nhi.c-885- if (!(val & REG_INMAIL_OP_REQUEST))
--
drivers/thunderbolt/nhi.c=907=enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi)
--
drivers/thunderbolt/nhi.c-910-
drivers/thunderbolt/nhi.c:911: val = ioread32(nhi->iobase + REG_OUTMAIL_CMD);
drivers/thunderbolt/nhi.c-912- val &= REG_OUTMAIL_CMD_OPMODE_MASK;
--
drivers/thunderbolt/nhi.c=918=void nhi_interrupt_work(struct work_struct *work)
--
drivers/thunderbolt/nhi.c-935- if (bit % 32 == 0)
drivers/thunderbolt/nhi.c:936: value = ioread32(nhi->iobase
drivers/thunderbolt/nhi.c-937- + REG_RING_NOTIFY_BASE
--
drivers/thunderbolt/nhi.c=1132=static void nhi_reset(struct tb_nhi *nhi)
--
drivers/thunderbolt/nhi.c-1136-
drivers/thunderbolt/nhi.c:1137: val = ioread32(nhi->iobase + REG_CAPS);
drivers/thunderbolt/nhi.c-1138- /* Reset only v2 and later routers */
--
drivers/thunderbolt/nhi.c-1146-
drivers/thunderbolt/nhi.c:1147: iowrite32(REG_RESET_HRR, nhi->iobase + REG_RESET);
drivers/thunderbolt/nhi.c-1148- msleep(100);
--
drivers/thunderbolt/nhi.c-1151- do {
drivers/thunderbolt/nhi.c:1152: val = ioread32(nhi->iobase + REG_RESET);
drivers/thunderbolt/nhi.c-1153- if (!(val & REG_RESET_HRR)) {
--
drivers/thunderbolt/nhi.c=1186=int nhi_probe(struct tb_nhi *nhi)
--
drivers/thunderbolt/nhi.c-1197-
drivers/thunderbolt/nhi.c:1198: nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
drivers/thunderbolt/nhi.c-1199- dev_dbg(dev, "total paths: %d\n", nhi->hop_count);
--
drivers/thunderbolt/pci.c=447=static int nhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
--
drivers/thunderbolt/pci.c-468-
drivers/thunderbolt/pci.c:469: nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");
drivers/thunderbolt/pci.c:470: res = PTR_ERR_OR_ZERO(nhi->iobase);
drivers/thunderbolt/pci.c-471- if (res)
]
|
| 110/4 |
2026/08/10 08:30 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 34362
output: 45
thoughts: 1550
Thoughts: **My Thought Process Regarding `nhi->iobase` Register Access**
This is all exceptionally clear and precise, which is a great starting point. My primary focus has been on understanding the exact usage of `nhi->iobase`, and I've confirmed that access is strictly confined to two files: `drivers/thunderbolt/nhi.c` and `drivers/thunderbolt/icm.c`.
To thoroughly map this out, I've meticulously listed every register accessed through `nhi->iobase`, along with their specific offsets. This list includes:
1. `REG_TX_RING_BASE` at `0x00000` (accessed via `ring_desc_base`)
2. `REG_RX_RING_BASE` at `0x08000` (accessed via `ring_desc_base`)
3. `REG_TX_OPTIONS_BASE` at `0x19800` (accessed via `ring_options_base`)
4. `REG_RX_OPTIONS_BASE` at `0x29800` (accessed via `ring_options_base`)
5. `REG_RING_NOTIFY_BASE` at `0x37800` (accessed via `nhi_clear_interrupt` and `nhi_interrupt_work`)
6. `REG_RING_INT_CLEAR` at `0x37808` (accessed via `nhi_clear_interrupt` and `ring_clear_msix`)
7. `REG_RING_INTERRUPT_BASE` at `0x38200` (accessed via `nhi_mask_interrupt` and `ring_interrupt_active`)
8. `REG_RING_INTERRUPT_MASK_CLEAR_BASE` at `0x38208` (accessed via `nhi_mask_interrupt` and `ring_interrupt_active`)
9. `REG_INT_THROTTLING_RATE` at `0x38c00` (accessed via `ring_interrupt_active`)
10. `REG_INT_VEC_ALLOC_BASE` at `0x38c40` (accessed via `ring_interrupt_active`)
11. `REG_CAPS` at `0x39640` (accessed via `nhi_reset` and `nhi_probe`)
12. `REG_DMA_MISC` at `0x39864` (accessed via `ring_interrupt_active`)
13. `REG_RESET` at `0x39898` (accessed via `nhi_reset`)
14. `REG_INMAIL_DATA` at `0x39900` (accessed via `nhi_mailbox_cmd`)
15. `REG_INMAIL_CMD` at `0x39904` (accessed via `nhi_mailbox_cmd`)
16. `REG_OUTMAIL_CMD` at `0x3990c` (accessed via `nhi_mailbox_mode`)
17. `REG_FW_STS` at `0x39944` (accessed via `icm_firmware_running`, `icm_ar_get_mode`, `icm_tgl_is_supported`, `icm_firmware_reset`, `icm_firmware_start`)
My next step was to ensure completeness. I revisited `nhi_regs.h` to confirm that the defined registers perfectly matched my findings and that no other relevant definitions were present. This verification was positive; the defines in the header are exactly what I've documented.
I also specifically noted the registers with offsets higher than `REG_CAPS` (`0x39640`), which are `REG_DMA_MISC`, `REG_RESET`, `REG_INMAIL_DATA`, `REG_INMAIL_CMD`, `REG_OUTMAIL_CMD`, and `REG_FW_STS`.
To be absolutely certain no stone was left unturned within the `drivers/thunderbolt/` directory, I performed a comprehensive search for any other files that might define or access registers. This involved a targeted `grep` for hexadecimal patterns. Specifically, a search for `0x39[0-9a-fA-F]+` yielded the list of registers starting with `0x39` that I've already captured.
However, I'm not entirely satisfied with just that. To be exhaustive, I'm now considering if there are any registers with offsets in the `0x3a`, `0x3b`, `0x3c` ranges, or even higher. This prompts a further, broader search using `0x3[a-fA-F][0-9a-fA-F]+` across the entire `drivers/thunderbolt/` directory. This is my current point of focus for ensuring absolute completeness.
|
| 111/4 |
2026/08/10 08:31 |
tool |
grepper |
0m
Args: map[Expression:0x3[a-fA-F][0-9a-fA-F]+ PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/dma_port.h=16=struct tb_dma_port;
drivers/thunderbolt/dma_port.h-17-
drivers/thunderbolt/dma_port.h:18:#define DMA_PORT_CSS_ADDRESS 0x3fffff
drivers/thunderbolt/dma_port.h-19-#define DMA_PORT_CSS_MAX_SIZE SZ_128
--
drivers/thunderbolt/eeprom.c=557=static int tb_drom_bit_bang(struct tb_switch *sw, u16 *size)
--
drivers/thunderbolt/eeprom.c-564-
drivers/thunderbolt/eeprom.c:565: *size &= 0x3ff;
drivers/thunderbolt/eeprom.c-566- *size += TB_DROM_DATA_START;
--
drivers/thunderbolt/nhi.c=1186=int nhi_probe(struct tb_nhi *nhi)
--
drivers/thunderbolt/nhi.c-1197-
drivers/thunderbolt/nhi.c:1198: nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
drivers/thunderbolt/nhi.c-1199- dev_dbg(dev, "total paths: %d\n", nhi->hop_count);
--
drivers/thunderbolt/stream.c=206=static const uuid_t tbstream_dir_uuid =
drivers/thunderbolt/stream.c:207: UUID_INIT(0x3a1cb984, 0xc4d9, 0x4469,
drivers/thunderbolt/stream.c-208- 0xa2, 0x77, 0xce, 0x2f, 0xdf, 0xd1, 0x1f, 0x0d);
]
|
| 112/4 |
2026/08/10 08:31 |
llm |
codeexpert |
1m
Model:
Tokens:
input: 36433
output: 25
thoughts: 73
Thoughts: **My Thought Process on `DMA_PORT_CSS_ADDRESS`**
My initial thought upon seeing `DMA_PORT_CSS_ADDRESS` with a value of `0x3fffff` is to immediately question its relevance to the NHI driver. This is a crucial step for me as an expert; I need to establish the functional connection. My immediate next action, therefore, is to investigate the definition and usage of `DMA_PORT_CSS_ADDRESS`. I want to understand precisely what this address represents and, more importantly, where it's being referenced within the codebase. To do this systematically, I'll be performing a targeted search, specifically within the `drivers/thunderbolt/` directory. This focused search allows me to efficiently pinpoint any interactions or dependencies the NHI driver might have with this particular DMA port address.
|
| 113/4 |
2026/08/10 08:32 |
tool |
codesearch-find-references |
0m
Error:
Args: map[Name:DMA_PORT_CSS_ADDRESS]
Results: map[References:<nil> TruncatedOutput:false]
|
| 114/4 |
2026/08/10 08:32 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 36540
output: 31
thoughts: 21
Thoughts: **My Thought Process**
Right, so the first thing that comes to my mind when I see this is, "How can I efficiently pinpoint all occurrences of this specific constant, `DMA_PORT_CSS_ADDRESS`?" I need to search through the codebase, and for this kind of targeted string search, my go-to tool is `grepper`. It's exceptionally good at quickly scanning files and directories for exact patterns. So, I'll be invoking `grepper` with the intention of finding every single line where `DMA_PORT_CSS_ADDRESS` appears. This will give me a comprehensive overview of where this particular memory-mapped register or configuration parameter is being referenced, which is crucial for understanding its usage, potential dependencies, and any side effects that might arise from modifications.
|
| 115/4 |
2026/08/10 08:32 |
tool |
grepper |
0m
Args: map[Expression:DMA_PORT_CSS_ADDRESS PathPrefix:drivers/thunderbolt]
Results: map[Output:drivers/thunderbolt/dma_port.c=317=static int dma_port_flash_write_block(void *data, unsigned int dwaddress,
--
drivers/thunderbolt/dma_port.c-333- /* CSS header write is always done to the same magic address */
drivers/thunderbolt/dma_port.c:334: if (dwaddress >= DMA_PORT_CSS_ADDRESS)
drivers/thunderbolt/dma_port.c-335- in |= MAIL_IN_CSS;
--
drivers/thunderbolt/dma_port.c=353=int dma_port_flash_read(struct tb_dma_port *dma, unsigned int address,
--
drivers/thunderbolt/dma_port.c-367- * Writes block of data to the non-active flash region of the switch. If
drivers/thunderbolt/dma_port.c:368: * the address is given as %DMA_PORT_CSS_ADDRESS the block is written
drivers/thunderbolt/dma_port.c-369- * using CSS command.
--
drivers/thunderbolt/dma_port.c=373=int dma_port_flash_write(struct tb_dma_port *dma, unsigned int address,
--
drivers/thunderbolt/dma_port.c-375-{
drivers/thunderbolt/dma_port.c:376: if (address >= DMA_PORT_CSS_ADDRESS && size > DMA_PORT_CSS_MAX_SIZE)
drivers/thunderbolt/dma_port.c-377- return -E2BIG;
--
drivers/thunderbolt/dma_port.h=16=struct tb_dma_port;
drivers/thunderbolt/dma_port.h-17-
drivers/thunderbolt/dma_port.h:18:#define DMA_PORT_CSS_ADDRESS 0x3fffff
drivers/thunderbolt/dma_port.h-19-#define DMA_PORT_CSS_MAX_SIZE SZ_128
--
drivers/thunderbolt/nvm.c=136=static int intel_switch_nvm_write_headers(struct tb_nvm *nvm)
--
drivers/thunderbolt/nvm.c-144- ret = dma_port_flash_write(sw->dma_port,
drivers/thunderbolt/nvm.c:145: DMA_PORT_CSS_ADDRESS, nvm->buf + INTEL_NVM_CSS,
drivers/thunderbolt/nvm.c-146- DMA_PORT_CSS_MAX_SIZE);
]
|
| 116/4 |
2026/08/10 08:32 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 37225
output: 31
thoughts: 243
Thoughts: **My Thought Process Regarding Thunderbolt NHI Register Offsets**
My initial realization was about the nature of `DMA_PORT_CSS_ADDRESS`. I've concluded that this isn't a register offset that the NHI driver would typically access. Instead, it serves as a flash address, specifically a double-word address, intended for writing to switch NVM flash via the DMA port. This distinction is crucial – it's not a memory-mapped register address in the conventional sense for the NHI driver.
Following this clarification, my immediate next step was to be more systematic about identifying potential register offsets. I wanted to ensure I hadn't overlooked any significant hex numbers that *could* represent register addresses, especially those larger than the `0x39640` value we've been discussing. To achieve this, I decided to perform targeted searches. My strategy was to look for hexadecimal numbers exceeding `0x39640`. I formulated search patterns like `0x[4-9a-fA-F][0-9a-fA-F]{4}` (for 5-digit hex numbers starting from 4 upwards) and `0x[1-9a-fA-F][0-9a-fA-F]{5}` (for 6-digit hex numbers). I planned to apply these patterns specifically within the `drivers/thunderbolt/nhi_regs.h` and `drivers/thunderbolt/nhi.c` files.
To broaden my initial search and get a comprehensive view of all hexadecimal values present, I also decided to simply search for `0x` within `drivers/thunderbolt/nhi_regs.h`. This would give me a complete list of all defined hex constants, allowing me to manually review them and ensure none were misidentified as register offsets.
However, I then remembered that I had already thoroughly reviewed `nhi_regs.h` in its entirety. This means the manual inspection approach for that file has already been completed, and I should have a firm understanding of its contents.
Given that `nhi_regs.h` has been covered, my focus shifted to `nhi.c`. I needed to double-check if there were any register offsets defined directly within the C source file, rather than solely in the header. My approach for this was to use `grep` to search for `#define` directives within `drivers/thunderbolt/nhi.c`. This would effectively list all macro definitions, and I could then examine any hex values associated with them to confirm if they represent register offsets.
|
| 117/4 |
2026/08/10 08:32 |
tool |
grepper |
0m
Args: map[Expression:#define PathPrefix:drivers/thunderbolt/nhi.c]
Results: map[Output:drivers/thunderbolt/nhi.c-27-
drivers/thunderbolt/nhi.c:28:#define RING_TYPE(ring) ((ring)->is_tx ? "TX ring" : "RX ring")
drivers/thunderbolt/nhi.c-29-
drivers/thunderbolt/nhi.c:30:#define RING_FIRST_USABLE_HOPID 1
drivers/thunderbolt/nhi.c-31-/*
--
drivers/thunderbolt/nhi.c-34- */
drivers/thunderbolt/nhi.c:35:#define RING_E2E_RESERVED_HOPID RING_FIRST_USABLE_HOPID
drivers/thunderbolt/nhi.c-36-
drivers/thunderbolt/nhi.c:37:#define NHI_MAILBOX_TIMEOUT 500 /* ms */
drivers/thunderbolt/nhi.c-38-
]
|
| 118/4 |
2026/08/10 08:32 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 37712
output: 31
thoughts: 43
Thoughts: **My Thought Process on Unidentified Register Offsets**
I've just been looking at `nhi.c` and it's struck me that there are no other register offsets defined there. This feels like an oversight, or perhaps an indication that these offsets are managed elsewhere. My immediate next step is to investigate `nhi.h`. I need to perform a thorough search within that header file for any `#define` directives that might be specifying these register offsets. I'll use `grep` for this to ensure I don't miss anything within `drivers/thunderbolt/nhi.h`.
|
| 119/4 |
2026/08/10 08:32 |
tool |
grepper |
0m
Args: map[Expression:#define PathPrefix:drivers/thunderbolt/nhi.h]
Results: map[Output:drivers/thunderbolt/nhi.h-9-#ifndef DSL3510_H_
drivers/thunderbolt/nhi.h:10:#define DSL3510_H_
drivers/thunderbolt/nhi.h-11-
--
drivers/thunderbolt/nhi.h=56=struct tb_nhi_ops {
--
drivers/thunderbolt/nhi.h-75- */
drivers/thunderbolt/nhi.h:76:#define PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_2C_NHI 0x1134
drivers/thunderbolt/nhi.h:77:#define PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_4C_NHI 0x1137
drivers/thunderbolt/nhi.h:78:#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI 0x157d
drivers/thunderbolt/nhi.h:79:#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE 0x157e
drivers/thunderbolt/nhi.h:80:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI 0x15bf
drivers/thunderbolt/nhi.h:81:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE 0x15c0
drivers/thunderbolt/nhi.h:82:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI 0x15d2
drivers/thunderbolt/nhi.h:83:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE 0x15d3
drivers/thunderbolt/nhi.h:84:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI 0x15d9
drivers/thunderbolt/nhi.h:85:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE 0x15da
drivers/thunderbolt/nhi.h:86:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI 0x15dc
drivers/thunderbolt/nhi.h:87:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI 0x15dd
drivers/thunderbolt/nhi.h:88:#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI 0x15de
drivers/thunderbolt/nhi.h:89:#define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE 0x15e7
drivers/thunderbolt/nhi.h:90:#define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_NHI 0x15e8
drivers/thunderbolt/nhi.h:91:#define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE 0x15ea
drivers/thunderbolt/nhi.h:92:#define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_NHI 0x15eb
drivers/thunderbolt/nhi.h:93:#define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE 0x15ef
drivers/thunderbolt/nhi.h:94:#define PCI_DEVICE_ID_INTEL_ADL_NHI0 0x463e
drivers/thunderbolt/nhi.h:95:#define PCI_DEVICE_ID_INTEL_ADL_NHI1 0x466d
drivers/thunderbolt/nhi.h:96:#define PCI_DEVICE_ID_INTEL_WCL_NHI0 0x4d33
drivers/thunderbolt/nhi.h:97:#define PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HOST_80G_NHI 0x5781
drivers/thunderbolt/nhi.h:98:#define PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HOST_40G_NHI 0x5784
drivers/thunderbolt/nhi.h:99:#define PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HUB_80G_BRIDGE 0x5786
drivers/thunderbolt/nhi.h:100:#define PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HUB_40G_BRIDGE 0x57a4
drivers/thunderbolt/nhi.h:101:#define PCI_DEVICE_ID_INTEL_MTL_M_NHI0 0x7eb2
drivers/thunderbolt/nhi.h:102:#define PCI_DEVICE_ID_INTEL_MTL_P_NHI0 0x7ec2
drivers/thunderbolt/nhi.h:103:#define PCI_DEVICE_ID_INTEL_MTL_P_NHI1 0x7ec3
drivers/thunderbolt/nhi.h:104:#define PCI_DEVICE_ID_INTEL_ICL_NHI1 0x8a0d
drivers/thunderbolt/nhi.h:105:#define PCI_DEVICE_ID_INTEL_ICL_NHI0 0x8a17
drivers/thunderbolt/nhi.h:106:#define PCI_DEVICE_ID_INTEL_TGL_NHI0 0x9a1b
drivers/thunderbolt/nhi.h:107:#define PCI_DEVICE_ID_INTEL_TGL_NHI1 0x9a1d
drivers/thunderbolt/nhi.h:108:#define PCI_DEVICE_ID_INTEL_TGL_H_NHI0 0x9a1f
drivers/thunderbolt/nhi.h:109:#define PCI_DEVICE_ID_INTEL_TGL_H_NHI1 0x9a21
drivers/thunderbolt/nhi.h:110:#define PCI_DEVICE_ID_INTEL_RPL_NHI0 0xa73e
drivers/thunderbolt/nhi.h:111:#define PCI_DEVICE_ID_INTEL_RPL_NHI1 0xa76d
drivers/thunderbolt/nhi.h:112:#define PCI_DEVICE_ID_INTEL_LNL_NHI0 0xa833
drivers/thunderbolt/nhi.h:113:#define PCI_DEVICE_ID_INTEL_LNL_NHI1 0xa834
drivers/thunderbolt/nhi.h:114:#define PCI_DEVICE_ID_INTEL_PTL_M_NHI0 0xe333
drivers/thunderbolt/nhi.h:115:#define PCI_DEVICE_ID_INTEL_PTL_M_NHI1 0xe334
drivers/thunderbolt/nhi.h:116:#define PCI_DEVICE_ID_INTEL_PTL_P_NHI0 0xe433
drivers/thunderbolt/nhi.h:117:#define PCI_DEVICE_ID_INTEL_PTL_P_NHI1 0xe434
drivers/thunderbolt/nhi.h-118-
drivers/thunderbolt/nhi.h:119:#define PCI_CLASS_SERIAL_USB_USB4 0x0c0340
drivers/thunderbolt/nhi.h-120-
drivers/thunderbolt/nhi.h-121-/* Host interface quirks */
drivers/thunderbolt/nhi.h:122:#define QUIRK_AUTO_CLEAR_INT BIT(0)
drivers/thunderbolt/nhi.h:123:#define QUIRK_E2E BIT(1)
drivers/thunderbolt/nhi.h-124-
--
drivers/thunderbolt/nhi.h-128- */
drivers/thunderbolt/nhi.h:129:#define MSIX_MIN_VECS 6
drivers/thunderbolt/nhi.h:130:#define MSIX_MAX_VECS 16
drivers/thunderbolt/nhi.h-131-
]
|
| 120/4 |
2026/08/10 08:32 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 39815
output: 31
thoughts: 1702
Thoughts: **My Thought Process Regarding Thunderbolt NHI Driver Register Accesses**
I've been tasked with determining if there are any registers accessed by the Thunderbolt NHI driver that have an offset greater than `0x39640`. My initial scan of `nhi.h` revealed no explicit definitions for register offsets beyond that point.
However, I need to be absolutely precise. The question specifically asks about "any other register." This implies I need to consider registers beyond just `REG_CAPS` (which has an offset of `0x39640`) and identify any that exceed this threshold. I've enumerated those that *do* exceed `0x39640` based on my current knowledge:
* `REG_DMA_MISC` (offset `0x39864`)
* `REG_RESET` (offset `0x39898`)
* `REG_INMAIL_DATA` (offset `0x39900`)
* `REG_INMAIL_CMD` (offset `0x39904`)
* `REG_OUTMAIL_CMD` (offset `0x3990c`)
* `REG_FW_STS` (offset `0x39944`)
Now, the critical step is to confirm if there are *any other* registers accessed that are *not* explicitly defined in `nhi_regs.h` but *are* accessed within the relevant driver files, specifically `nhi.c`, `icm.c`, or `pci.c`. My investigation involved searching for all instances where `iobase` is utilized. This search revealed that the offsets added to `iobase` are limited to:
* `REG_RING_INTERRUPT_BASE + ring`
* `REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring`
* `REG_RING_NOTIFY_BASE + ring`
* `REG_RING_INT_CLEAR + ring`
* `REG_DMA_MISC`
* `REG_INT_VEC_ALLOC_BASE`
* `REG_INT_THROTTLING_RATE + ring->vector * 4`
* `REG_TX_RING_BASE` / `REG_RX_RING_BASE`
* `REG_TX_OPTIONS_BASE` / `REG_RX_OPTIONS_BASE`
* `REG_INMAIL_DATA`
* `REG_INMAIL_CMD`
* `REG_OUTMAIL_CMD`
* `REG_CAPS`
* `REG_RESET`
* `REG_FW_STS`
I then meticulously examined the ring descriptors themselves. These are accessed via `ring_desc_base(ring) + offset`. Since `ring_desc_base(ring)` is derived from `iobase + REG_TX_RING_BASE` (offset `0x00000`) or `iobase + REG_RX_RING_BASE` (offset `0x08000`), and the offsets added are typically small (e.g., 0, 4, 8, 12), these accesses remain well below the `0x39640` threshold.
Similarly, `ring_options_base(ring)` is based on `iobase + REG_TX_OPTIONS_BASE` (offset `0x19800`) or `iobase + REG_RX_OPTIONS_BASE` (offset `0x29800`). Again, the subsequent small offsets (e.g., 0, 4) keep these accesses below the critical `0x39640`.
I also checked other base addresses and their related offsets:
* `REG_RING_NOTIFY_BASE` (offset `0x37800`)
* `REG_RING_INT_CLEAR` (offset `0x37808`)
* `REG_RING_INTERRUPT_BASE` (offset `0x38200`)
* `REG_RING_INTERRUPT_MASK_CLEAR_BASE` (offset `0x38208`)
* `REG_INT_THROTTLING_RATE` (offset `0x38c00`)
* `REG_INT_VEC_ALLOC_BASE` (offset `0x38c40`)
All of these are, importantly, less than `0x39640`.
Therefore, based on my thorough examination of the registered offsets and the search for direct register accesses within the `nhi.c` and `icm.c` files (specifically looking for `readl`, `writel`, `ioread`, `iowrite`, `readq`, and `writeq`), the registers accessed by the Thunderbolt NHI driver that have an offset *larger* than `0x39640` are precisely these six:
1. `REG_DMA_MISC` at offset `0x39864`
2. `REG_RESET` at offset `0x39898`
3. `REG_INMAIL_DATA` at offset `0x39900`
4. `REG_INMAIL_CMD` at offset `0x39904`
5. `REG_OUTMAIL_CMD` at offset `0x3990c`
6. `REG_FW_STS` at offset `0x39944`
To be absolutely certain, I also scanned other files within the `drivers/thunderbolt/` directory. `ctl.c`, `tb.c`, `switch.c`, `usb4.c`, `tunnel.c`, and `path.c` do not appear to perform direct register accesses to the NHI device's I/O regions in a manner that would introduce offsets greater than `0x39640`. Instead, they rely on control channel packets, DMA ports, or calls to functions that ultimately manage these lower-level accesses. My searches for direct I/O read/write operations in these files did not yield any additional registers exceeding the specified offset.
|
| 121/4 |
2026/08/10 08:33 |
tool |
grepper |
0m
Error:
Args: map[Expression:(readq|writeq) PathPrefix:drivers/thunderbolt]
Results:
|
| 122/4 |
2026/08/10 08:33 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 41546
output: 32
thoughts: 55
Thoughts: **My Thought Process on Finding DMA Operations in Thunderbolt Drivers**
Alright, so I'm digging into this Thunderbolt driver code, and I'm trying to pinpoint how it's handling Direct Memory Access (DMA) operations – specifically, how it's transferring data between the system's main memory and the Thunderbolt controller's I/O space. My initial instinct was to look for the standard `readq` and `writeq` functions. These are pretty common for direct register access, especially when dealing with 64-bit values. However, a quick check reveals that there are no direct matches for `readq` or `writeq` in this context. This tells me that the driver isn't just doing simple, direct register reads or writes. It's likely using a more abstract, higher-level mechanism for I/O memory access, which is typical for DMA.
So, the next logical step is to consider functions designed for block transfers to and from I/O memory. The `memcpy_fromio` and `memcpy_toio` functions immediately come to mind. These are specifically built for copying blocks of data to and from I/O memory regions, which is precisely what you'd expect for a DMA setup. They handle the underlying memory mapping and access details, abstracting away the complexities of the hardware.
Therefore, my next move is to perform a targeted search. I'll be grepping through the `drivers/thunderbolt/` directory specifically for instances of `memcpy_fromio` or `memcpy_toio`. This should give me direct insight into where and how the driver is initiating these crucial DMA data transfers. If I find them, it will confirm my hypothesis about the driver's approach and allow me to analyze the specific data paths and buffer management involved.
|
| 123/4 |
2026/08/10 08:33 |
tool |
grepper |
0m
Error:
Args: map[Expression:memcpy_(fromio|toio) PathPrefix:drivers/thunderbolt]
Results:
|
| 124/4 |
2026/08/10 08:33 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 41631
output: 22
thoughts: 95
Thoughts: **A Deep Dive into `iobase` and `tb_nhi`**
I'm grappling with a situation where I'm seeing "no matches," which is always a frustrating starting point. My immediate thought is to explore the most direct avenue for accessing memory-mapped I/O: direct pointer dereferencing of `iobase`. However, I need to pause and verify the type of `iobase` before proceeding. I recall, or suspect, that `iobase` is declared as `void __iomem *iobase` within the `struct tb_nhi` definition. To be absolutely certain, I need to locate the precise definition of `struct tb_nhi`. My next step will be to search for this structure's definition, likely within the kernel source, specifically in files like `include/linux/thunderbolt.h` or potentially `drivers/thunderbolt/tb.h`, as that seems like the most logical place for Thunderbolt-related structures. This verification is crucial before I can confidently consider direct dereferencing or any other manipulation of `iobase`.
|
| 125/4 |
2026/08/10 08:33 |
tool |
codesearch-definition-source |
0m
Args:
Results: map[SourceCode: 500: /**
501: * struct tb_nhi - thunderbolt native host interface
502: * @lock: Must be held during ring creation/destruction. Is acquired by
503: * interrupt_work when dispatching interrupts to individual rings.
504: * @dev: Device associated with this NHI instance
505: * @ops: NHI specific optional ops
506: * @iobase: MMIO space of the NHI
507: * @tx_rings: All Tx rings available on this host controller
508: * @rx_rings: All Rx rings available on this host controller
509: * @going_away: The host controller device is about to disappear so when
510: * this flag is set, avoid touching the hardware anymore.
511: * @iommu_dma_protection: An IOMMU will isolate external-facing ports.
512: * @interrupt_work: Work scheduled to handle ring interrupt when no
513: * MSI-X is used.
514: * @hop_count: Number of rings (end point hops) supported by NHI.
515: * @quirks: NHI specific quirks if any
516: * @domain_released: Completed when domain has been fully released
517: */
518: struct tb_nhi {
519: spinlock_t lock;
520: struct device *dev;
521: const struct tb_nhi_ops *ops;
522: void __iomem *iobase;
523: struct tb_ring **tx_rings;
524: struct tb_ring **rx_rings;
525: bool going_away;
526: bool iommu_dma_protection;
527: struct work_struct interrupt_work;
528: u32 hop_count;
529: unsigned long quirks;
530: struct completion domain_released;
531: };
SourceFile:include/linux/thunderbolt.h]
|
| 126/4 |
2026/08/10 08:33 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 42304
output: 25
thoughts: 220
Thoughts: **My Thought Process Regarding `iobase` and Thunderbolt Driver Interactions**
So, I've confirmed that `iobase` is indeed a `void __iomem *`. My next step was to meticulously investigate its usage within the `drivers/thunderbolt/` directory. I wanted to be absolutely certain which files were interacting with this specific member. My initial search, using `grep` for `iobase` specifically within `drivers/thunderbolt/`, yielded a definitive list: `icm.c`, `nhi.c`, and `pci.c`. The absence of any other files in this directory that contained references to `iobase` provided a strong indication that my focus was correctly narrowed.
However, my curiosity didn't stop there. As an expert in this domain, I understand the importance of a comprehensive understanding. I needed to ascertain if `tb_nhi::iobase`, or more practically, `nhi->iobase` (given the likely structure), was being accessed or manipulated from *outside* the immediate Thunderbolt driver directory. To achieve this, I decided to leverage a more powerful tool: `codesearch-find-references`. This tool is invaluable for tracing symbol usage across the entire kernel codebase. My intention was to run it specifically to find all references to `tb_nhi::iobase`, which would, by extension, reveal any external dependencies or interactions with the `iobase` member of the `tb_nhi` structure.
|
| 127/4 |
2026/08/10 08:33 |
tool |
codesearch-find-references |
0m
Args:
Results: map[References:[map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:__ring_interrupt_mask SourceFile:drivers/thunderbolt/nhi.c SourceLine:387] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:__ring_interrupt_mask SourceFile:drivers/thunderbolt/nhi.c SourceLine:392] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:icm_ar_get_mode SourceFile:drivers/thunderbolt/icm.c SourceLine:1516] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:icm_firmware_reset SourceFile:drivers/thunderbolt/icm.c SourceLine:1846] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:icm_firmware_reset SourceFile:drivers/thunderbolt/icm.c SourceLine:1848] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:icm_firmware_reset SourceFile:drivers/thunderbolt/icm.c SourceLine:1851] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:icm_firmware_reset SourceFile:drivers/thunderbolt/icm.c SourceLine:1854] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:icm_firmware_running SourceFile:drivers/thunderbolt/icm.c SourceLine:379] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:icm_firmware_start SourceFile:drivers/thunderbolt/icm.c SourceLine:1879] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:icm_tgl_is_supported SourceFile:drivers/thunderbolt/icm.c SourceLine:1726] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_clear_interrupt SourceFile:drivers/thunderbolt/nhi.c SourceLine:66] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_clear_interrupt SourceFile:drivers/thunderbolt/nhi.c SourceLine:68] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_interrupt_work SourceFile:drivers/thunderbolt/nhi.c SourceLine:936] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_mailbox_cmd SourceFile:drivers/thunderbolt/nhi.c SourceLine:875] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_mailbox_cmd SourceFile:drivers/thunderbolt/nhi.c SourceLine:877] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_mailbox_cmd SourceFile:drivers/thunderbolt/nhi.c SourceLine:880] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_mailbox_cmd SourceFile:drivers/thunderbolt/nhi.c SourceLine:884] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_mailbox_mode SourceFile:drivers/thunderbolt/nhi.c SourceLine:911] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_mask_interrupt SourceFile:drivers/thunderbolt/nhi.c SourceLine:56] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_mask_interrupt SourceFile:drivers/thunderbolt/nhi.c SourceLine:57] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_mask_interrupt SourceFile:drivers/thunderbolt/nhi.c SourceLine:59] map[ReferenceKind:writes ReferencingEntityKind:function ReferencingEntityName:nhi_pci_probe SourceFile:drivers/thunderbolt/pci.c SourceLine:469] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_pci_probe SourceFile:drivers/thunderbolt/pci.c SourceLine:470] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_probe SourceFile:drivers/thunderbolt/nhi.c SourceLine:1198] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_reset SourceFile:drivers/thunderbolt/nhi.c SourceLine:1137] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_reset SourceFile:drivers/thunderbolt/nhi.c SourceLine:1147] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:nhi_reset SourceFile:drivers/thunderbolt/nhi.c SourceLine:1152] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_clear_msix SourceFile:drivers/thunderbolt/nhi.c SourceLine:438] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_clear_msix SourceFile:drivers/thunderbolt/nhi.c SourceLine:440] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_desc_base SourceFile:drivers/thunderbolt/nhi.c SourceLine:173] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_interrupt_active SourceFile:drivers/thunderbolt/nhi.c SourceLine:106] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_interrupt_active SourceFile:drivers/thunderbolt/nhi.c SourceLine:113] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_interrupt_active SourceFile:drivers/thunderbolt/nhi.c SourceLine:115] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_interrupt_active SourceFile:drivers/thunderbolt/nhi.c SourceLine:127] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_interrupt_active SourceFile:drivers/thunderbolt/nhi.c SourceLine:131] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_interrupt_active SourceFile:drivers/thunderbolt/nhi.c SourceLine:147] map[ReferenceKind:reads ReferencingEntityKind:function ReferencingEntityName:ring_options_base SourceFile:drivers/thunderbolt/nhi.c SourceLine:181]] TruncatedOutput:false]
|
| 128/4 |
2026/08/10 08:33 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 43818
output: 39
thoughts: 114
Thoughts: **My Journey Through `tb_nhi::iobase`**
Wow, this is incredible! The `codesearch-find-references` tool has just provided me with a precise list of all functions that interact with `tb_nhi::iobase`. My immediate thought is to meticulously examine each one to understand its role in the system.
My first target is `__ring_interrupt_mask` located in `drivers/thunderbolt/nhi.c`. I need to dive into its implementation to see exactly how it's manipulating `tb_nhi::iobase`. My current understanding is that it's performing read and write operations on `ring->nhi->iobase + reg`. The crucial next step is to figure out what `reg` represents – its value and context are key to understanding the precise memory locations being accessed within `tb_nhi::iobase`. I'm already mentally tracing the data flow and potential side effects.
|
| 129/4 |
2026/08/10 08:33 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:__ring_interrupt_mask]
Results: map[SourceCode: 380: static void __ring_interrupt_mask(struct tb_ring *ring, bool mask)
381: {
382: int idx = ring_interrupt_index(ring);
383: int reg = REG_RING_INTERRUPT_BASE + idx / 32 * 4;
384: int bit = idx % 32;
385: u32 val;
386:
387: val = ioread32(ring->nhi->iobase + reg);
388: if (mask)
389: val &= ~BIT(bit);
390: else
391: val |= BIT(bit);
392: iowrite32(val, ring->nhi->iobase + reg);
393: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 130/4 |
2026/08/10 08:33 |
llm |
codeexpert |
1m
Model:
Tokens:
input: 44203
output: 41
thoughts: 213
Thoughts: **My Thought Process Regarding Ring Interrupt Register Calculation and `icm_ar_get_mode`**
Okay, so when I'm looking at this `reg` expression, `REG_RING_INTERRUPT_BASE + idx / 32 * 4`, my first instinct is to break down the components. I know `REG_RING_INTERRUPT_BASE` is a fixed offset, `0x38200` in this case. The `idx` value, which is related to `hop_count`, is the variable part I need to pay attention to. I'm doing a quick mental check on the potential range of `idx`. The text mentions `idx` is at most `2 * hop_count`, and I recall `hop_count` can be quite large, maybe up to 256 in typical scenarios. However, I also see a note that `hop_count` can actually go up to 2048. So, I'm performing a quick calculation: if `idx` is at its maximum, `2 * 2048 = 4096`. Then, `4096 / 32 * 4` simplifies to `128 * 4`, which is `512`. Adding this to the base address, `0x38200 + 512` gives me `0x38200 + 0x200 = 0x38400`. I'm mentally confirming that this calculated address (`0x38400`) is indeed well within the expected range, specifically below the upper bound of `0x39640` mentioned in my internal knowledge base or the context I'm working with. This calculation is crucial for me to ensure I'm not going to hit any out-of-bounds memory access or unexpected behavior. It's a sanity check to confirm the register mapping is as anticipated.
Following that, my attention shifts to the function call: `icm_ar_get_mode` in `drivers/thunderbolt/icm.c`. My next step is naturally to dive into the implementation of this specific function. I need to understand exactly what `icm_ar_get_mode` does, what parameters it takes, what it returns, and how it interacts with the system. This is where I'd typically start looking at the source code itself to trace its execution path and understand its purpose within the Thunderbolt driver context. I'm anticipating that this function likely plays a role in determining or querying some mode or state related to the "ar" component, and its output might be relevant to how the ring interrupts are configured or managed.
|
| 131/4 |
2026/08/10 08:34 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/icm.c Name:icm_ar_get_mode]
Results: map[SourceCode:1509: static int icm_ar_get_mode(struct tb *tb)
1510: {
1511: struct tb_nhi *nhi = tb->nhi;
1512: int retries = 60;
1513: u32 val;
1514:
1515: do {
1516: val = ioread32(nhi->iobase + REG_FW_STS);
1517: if (val & REG_FW_STS_NVM_AUTH_DONE)
1518: break;
1519: msleep(50);
1520: } while (--retries);
1521:
1522: if (!retries) {
1523: dev_err(nhi->dev, "ICM firmware not authenticated\n");
1524: return -ENODEV;
1525: }
1526:
1527: return nhi_mailbox_mode(nhi);
1528: }
SourceFile:drivers/thunderbolt/icm.c]
|
| 132/4 |
2026/08/10 08:34 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 44748
output: 40
thoughts: 60
Thoughts: **My Thought Process Regarding Firmware Reset and Status Register Access**
Alright, so my current line of thinking is to delve into the specifics of how the firmware reset process is handled, particularly in relation to how the system monitors and potentially interacts with the firmware's state.
My investigation has led me to a specific point of interest: the `icm_firmware_reset` function, located within the `drivers/thunderbolt/icm.c` file. This seems like a crucial entry point for understanding the reset mechanism itself.
Before I dive headfirst into the `icm_firmware_reset` code, I'm making a mental note, or rather, actively recalling, that as part of this reset procedure, the system is going to be accessing the `REG_FW_STS` register. I know this register is situated at a particular memory offset, `0x39944`. This access to the firmware status register is significant because it implies that the system isn't just blindly initiating a reset; it's likely going to be checking the firmware's status *before* or *after* the reset, or perhaps even *during* the process, to gauge its state, confirm successful reset, or detect any issues. Understanding what `REG_FW_STS` actually signifies and what values it might hold will be paramount to fully grasping the firmware reset flow.
So, my immediate next step, mentally speaking, is to examine the implementation of `icm_firmware_reset` in `drivers/thunderbolt/icm.c` to see precisely *how* it uses or interacts with that `REG_FW_STS` register and what other actions it performs during a firmware reset.
|
| 133/4 |
2026/08/10 08:34 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/icm.c Name:icm_firmware_reset]
Results: map[SourceCode:1837: static int icm_firmware_reset(struct tb *tb, struct tb_nhi *nhi)
1838: {
1839: struct icm *icm = tb_priv(tb);
1840: u32 val;
1841:
1842: if (!icm->upstream_port)
1843: return -ENODEV;
1844:
1845: /* Put ARC to wait for CIO reset event to happen */
1846: val = ioread32(nhi->iobase + REG_FW_STS);
1847: val |= REG_FW_STS_CIO_RESET_REQ;
1848: iowrite32(val, nhi->iobase + REG_FW_STS);
1849:
1850: /* Re-start ARC */
1851: val = ioread32(nhi->iobase + REG_FW_STS);
1852: val |= REG_FW_STS_ICM_EN_INVERT;
1853: val |= REG_FW_STS_ICM_EN_CPU;
1854: iowrite32(val, nhi->iobase + REG_FW_STS);
1855:
1856: /* Trigger CIO reset now */
1857: return icm->cio_reset(tb);
1858: }
SourceFile:drivers/thunderbolt/icm.c]
|
| 134/4 |
2026/08/10 08:34 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 45230
output: 40
thoughts: 60
Thoughts: **My Thought Process on Firmware Status Checking**
Alright, so my current line of inquiry is focused on how this system verifies that the firmware is actually up and running, which is a pretty fundamental aspect of device operation. My first step in this particular thought sequence was to zero in on a specific piece of hardware: the `REG_FW_STS` register. I know this register, located at offset `0x39944` within the memory map, is the designated location for firmware status information. It's the immediate, low-level indicator I'd expect to interact with.
Following that initial hardware pointer, my thoughts naturally gravitated towards the software implementation that would be reading from this register. I immediately thought, "Where in the code is this `REG_FW_STS` being accessed?" This led me directly to a function named `icm_firmware_running`, situated within the `drivers/thunderbolt/icm.c` file. This function name is highly suggestive; it strongly implies that its purpose is precisely to determine if the ICM (which I understand to be the relevant component here) firmware is in an operational state. Therefore, my next logical step, and indeed the core of my current investigation, is to thoroughly examine the implementation of `icm_firmware_running` to understand *how* it's utilizing the `REG_FW_STS` register to achieve its stated goal. I need to see the precise read operations, any masking or interpretation of the register's bits, and the logic that ultimately leads to the function returning a "true" or "false" indication of firmware status.
|
| 135/4 |
2026/08/10 08:34 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/icm.c Name:icm_firmware_running]
Results: map[SourceCode: 375: static bool icm_firmware_running(const struct tb_nhi *nhi)
376: {
377: u32 val;
378:
379: val = ioread32(nhi->iobase + REG_FW_STS);
380: return !!(val & REG_FW_STS_ICM_EN);
381: }
SourceFile:drivers/thunderbolt/icm.c]
|
| 136/4 |
2026/08/10 08:34 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 45454
output: 40
thoughts: 60
Thoughts: **My Thought Process on Firmware Initialization**
Alright, so the first thing that catches my eye is this direct access to `REG_FW_STS` at offset `0x39944`. This immediately tells me we're dealing with some low-level hardware register manipulation, likely for status reporting or control related to the firmware itself. The fact that it's named `REG_FW_STS` strongly suggests it's a firmware status register, which is crucial for understanding the operational state of the Thunderbolt controller's integrated firmware.
Then, my attention shifts to the function call: `icm_firmware_start` in `drivers/thunderbolt/icm.c`. This is the core of what I need to understand. The name itself implies this is the entry point for initiating the firmware's boot sequence or its operational start. My immediate instinct is to dive into its implementation. I need to see *how* it accesses `REG_FW_STS` and *what* it's doing with that information. Is it reading the status to ensure the firmware is ready, or is it writing a command to initiate a start sequence? Understanding the context of that register access within this specific function is key to grasping the overall firmware initialization flow. I'm anticipating seeing checks for readiness, perhaps some initial configuration steps, and then potentially signaling the firmware to begin its own internal processes.
|
| 137/4 |
2026/08/10 08:34 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/icm.c Name:icm_firmware_start]
Results: map[SourceCode:1860: static int icm_firmware_start(struct tb *tb, struct tb_nhi *nhi)
1861: {
1862: unsigned int retries = 10;
1863: int ret;
1864: u32 val;
1865:
1866: /* Check if the ICM firmware is already running */
1867: if (icm_firmware_running(nhi))
1868: return 0;
1869:
1870: dev_dbg(nhi->dev, "starting ICM firmware\n");
1871:
1872: ret = icm_firmware_reset(tb, nhi);
1873: if (ret)
1874: return ret;
1875:
1876: /* Wait until the ICM firmware tells us it is up and running */
1877: do {
1878: /* Check that the ICM firmware is running */
1879: val = ioread32(nhi->iobase + REG_FW_STS);
1880: if (val & REG_FW_STS_NVM_AUTH_DONE)
1881: return 0;
1882:
1883: msleep(300);
1884: } while (--retries);
1885:
1886: return -ETIMEDOUT;
1887: }
SourceFile:drivers/thunderbolt/icm.c]
|
| 138/4 |
2026/08/10 08:34 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 45955
output: 42
thoughts: 64
Thoughts: **My Thought Process Regarding Thunderbolt ICM TGL Support**
Alright, let's dive into this. My primary objective here is to understand how the system determines whether ICM (Intel® Converged Management Engine) is supported on Tiger Lake (TGL) platforms, specifically within the context of Thunderbolt drivers.
First off, I need to pinpoint the exact mechanism for checking this support. I've identified that the crucial piece of information is likely stored in a specific hardware register. My investigation leads me to `REG_FW_STS`, which resides at offset `0x39944`. This register, I presume, holds firmware status flags, and I'm specifically looking for a bit or a field within it that indicates ICM TGL support.
Having established the hardware interface, the next logical step is to examine the software implementation that reads and interprets this hardware status. I'm focusing on the function `icm_tgl_is_supported` within the `drivers/thunderbolt/icm.c` file. This function is precisely where the logic for this check should reside. My intention is to scrutinize its implementation thoroughly. I want to see *how* it accesses `REG_FW_STS` and *what specific condition* it checks within that register to return a true or false value for ICM TGL support. Understanding this function's internals is key to confirming and perhaps even debugging any issues related to this feature.
|
| 139/4 |
2026/08/10 08:34 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/icm.c Name:icm_tgl_is_supported]
Results: map[SourceCode:1719: static bool icm_tgl_is_supported(struct tb *tb)
1720: {
1721: unsigned long end = jiffies + msecs_to_jiffies(10);
1722:
1723: do {
1724: u32 val;
1725:
1726: val = ioread32(tb->nhi->iobase + REG_FW_STS);
1727: if (val & REG_FW_STS_NVM_AUTH_DONE)
1728: return true;
1729: usleep_range(100, 500);
1730: } while (time_before(jiffies, end));
1731:
1732: return false;
1733: }
SourceFile:drivers/thunderbolt/icm.c]
|
| 140/4 |
2026/08/10 08:34 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 46296
output: 39
thoughts: 58
Thoughts: **My Thought Process**
Alright, so I'm digging into this firmware status register, `REG_FW_STS`, which is located at offset `0x39944`. This is the first concrete data point I'm seeing about the system's state. My immediate next step is to understand how this register is being interacted with, specifically in terms of clearing interrupts. I'm going to jump over to the `drivers/thunderbolt/nhi.c` file and examine the `nhi_clear_interrupt` function. I need to see *exactly* what operations it performs on that `REG_FW_STS` register, or any related registers, to ensure interrupts are being properly acknowledged and cleared within the Thunderbolt host controller. This is crucial for reliable interrupt handling and preventing spurious wake-ups or missed events.
|
| 141/4 |
2026/08/10 08:35 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_clear_interrupt]
Results: map[SourceCode: 63: static void nhi_clear_interrupt(struct tb_nhi *nhi, int ring)
64: {
65: if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
66: ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + ring);
67: else
68: iowrite32(~0, nhi->iobase + REG_RING_INT_CLEAR + ring);
69: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 142/4 |
2026/08/10 08:35 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 46533
output: 24
thoughts: 130
Thoughts: **My Thought Process on Interrupt Handling**
Okay, so when I'm looking at how interrupts are being cleared, I'm seeing a couple of potential memory-mapped locations that are being accessed. It's either going to be at `REG_RING_NOTIFY_BASE` plus an offset defined by `ring`, or it's going to be at `REG_RING_INT_CLEAR` plus the same `ring` offset. The base address for the notification register is `0x37800`, and for the interrupt clear register, it's `0x37808`.
Now, I need to be precise about what this `ring` value actually represents in the context of the offset calculation. I see a formula `ring_interrupt_index(ring) / 32 * 4`. This suggests that `ring` itself isn't directly the byte offset, but rather it's used to derive it, likely by first determining which group of 32 interrupts it falls into (`ring_interrupt_index(ring) / 32`) and then scaling that by 4, presumably because each interrupt control register block is 4 bytes wide.
However, I'm not entirely sure about the exact value of the `ring` argument that gets passed *into* the `nhi_clear_interrupt` function. Before I commit to the offset calculation, I really need to trace back the calls and find all the places where `nhi_clear_interrupt` is actually invoked. That's the next crucial step to ensure I'm targeting the correct hardware register for clearing the interrupt.
|
| 143/4 |
2026/08/10 08:35 |
tool |
codesearch-find-references |
0m
Args: map[Name:nhi_clear_interrupt]
Results: map[References:[map[ReferenceKind:calls ReferencingEntityKind:function ReferencingEntityName:nhi_disable_interrupts SourceFile:drivers/thunderbolt/nhi.c SourceLine:166]] TruncatedOutput:false]
|
| 144/4 |
2026/08/10 08:35 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 46730
output: 40
thoughts: 27
Thoughts: **My Thought Process on Interrupt Handling in the NHI Driver**
My current focus is on understanding the precise flow of interrupt management within the NHI driver, specifically how the `nhi_clear_interrupt` function is invoked. To achieve this, I'm going to delve into the `nhi_disable_interrupts` function's implementation. My expectation is that as part of the process of disabling interrupts, the driver will also need to acknowledge and clear any pending interrupt conditions. Therefore, examining `nhi_disable_interrupts` should reveal the mechanism by which `nhi_clear_interrupt` is utilized, providing me with a clear picture of the interrupt clearing routine within this context.
|
| 145/4 |
2026/08/10 08:35 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_disable_interrupts]
Results: map[SourceCode: 152: /*
153: * nhi_disable_interrupts() - disable interrupts for all rings
154: *
155: * Use only during init and shutdown.
156: */
157: void nhi_disable_interrupts(struct tb_nhi *nhi)
158: {
159: int i = 0;
160: /* disable interrupts */
161: for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
162: nhi_mask_interrupt(nhi, ~0, 4 * i);
163:
164: /* clear interrupt status bits */
165: for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++)
166: nhi_clear_interrupt(nhi, 4 * i);
167: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 146/4 |
2026/08/10 08:35 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 47061
output: 39
thoughts: 206
Thoughts: **My Thought Process Regarding Register Offsets and Interrupt Handling**
Okay, so my initial thought here is about understanding the offset calculation for a `ring` within a register block. I've identified that `ring` is fundamentally `4 * i`, which tells me it's a pointer to a specific register's offset. This is important for understanding how I'll access these registers.
Then, I need to consider the context of `RING_NOTIFY_REG_COUNT(nhi)`. I've calculated that for a `hop_count` of 256, this value comes out to be 24. Now, knowing that `ring` is `4 * i` and `i` can go up to this calculated count, I can determine the maximum offset. So, `4 * i` will be at most `4 * 24 = 96`.
This maximum offset is crucial when I consider the base address, `REG_RING_NOTIFY_BASE`. If I add the maximum offset of 96 to this base address, I get `0x37800 + 96 = 0x37860`. My check confirms this value is well within the expected range, specifically below `0x39640`, which gives me confidence in the calculation and the memory mapping.
Moving on, the next step in my thought process is to examine the `nhi_interrupt_work` function, located in `drivers/thunderbolt/nhi.c`. This is where the actual interrupt handling logic resides, and I need to dive into its implementation to fully understand how the system reacts to interrupts and how it utilizes the register offsets I've been analyzing.
|
| 147/4 |
2026/08/10 08:35 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_interrupt_work]
Results: map[SourceCode: 918: void nhi_interrupt_work(struct work_struct *work)
919: {
920: struct tb_nhi *nhi = container_of(work, typeof(*nhi), interrupt_work);
921: int value = 0; /* Suppress uninitialized usage warning. */
922: int bit;
923: int hop = -1;
924: int type = 0; /* current interrupt type 0: TX, 1: RX, 2: RX overflow */
925: struct tb_ring *ring;
926:
927: spin_lock_irq(&nhi->lock);
928:
929: /*
930: * Starting at REG_RING_NOTIFY_BASE there are three status bitfields
931: * (TX, RX, RX overflow). We iterate over the bits and read a new
932: * dwords as required. The registers are cleared on read.
933: */
934: for (bit = 0; bit < 3 * nhi->hop_count; bit++) {
935: if (bit % 32 == 0)
936: value = ioread32(nhi->iobase
937: + REG_RING_NOTIFY_BASE
938: + 4 * (bit / 32));
939: if (++hop == nhi->hop_count) {
940: hop = 0;
941: type++;
942: }
943: if ((value & (1 << (bit % 32))) == 0)
944: continue;
945: if (type == 2) {
946: dev_warn(nhi->dev, "RX overflow for ring %d\n", hop);
947: continue;
948: }
949: if (type == 0)
950: ring = nhi->tx_rings[hop];
951: else
952: ring = nhi->rx_rings[hop];
953: if (ring == NULL) {
954: dev_warn(nhi->dev,
955: "got interrupt for inactive %s ring %d\n",
956: type ? "RX" : "TX",
957: hop);
958: continue;
959: }
960:
961: spin_lock(&ring->lock);
962: __ring_interrupt(ring);
963: spin_unlock(&ring->lock);
964: }
965: spin_unlock_irq(&nhi->lock);
966: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 148/4 |
2026/08/10 08:35 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 48063
output: 39
thoughts: 165
Thoughts: **My Thought Process Regarding Register Access in the Thunderbolt NHI Driver**
When I see the expression `REG_RING_NOTIFY_BASE + 4 * (bit / 32)`, my immediate concern is understanding the bounds of the memory access it represents. I know that `bit` has a maximum value defined by `3 * nhi->hop_count`. Given the context where `hop_count` can be as large as 256, this means `bit` can reach up to 768.
Now, I need to calculate the maximum offset `4 * (bit / 32)`. If `bit` is 768, then `bit / 32` is 24. Multiplying that by 4 gives me a maximum offset of 96.
Therefore, the highest address I could possibly access through `REG_RING_NOTIFY_BASE + 4 * (bit / 32)` would be `REG_RING_NOTIFY_BASE + 96`. The text explicitly states that `REG_RING_NOTIFY_BASE` is `0x37860`. Adding 96 to this value, I arrive at `0x378F0`. Crucially, this calculated maximum address, `0x378F0`, is comfortably within the range, as it's well below `0x39640`. This confirms to me that the register access is safe and will not go out of bounds, at least based on this particular calculation.
Following this, my attention shifts to the specific function `nhi_mailbox_cmd` in `drivers/thunderbolt/nhi.c`. My next logical step is to dive into the implementation of `nhi_mailbox_cmd` itself. I need to understand exactly how it uses the register access I just analyzed, and what other operations it performs. This is where I'll look for further details about its behavior and potential interactions with the hardware.
|
| 149/4 |
2026/08/10 08:35 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_mailbox_cmd]
Results: map[SourceCode: 860: /**
861: * nhi_mailbox_cmd() - Send a command through NHI mailbox
862: * @nhi: Pointer to the NHI structure
863: * @cmd: Command to send
864: * @data: Data to be send with the command
865: *
866: * Sends mailbox command to the firmware running on NHI.
867: *
868: * Return: %0 on success, negative errno otherwise.
869: */
870: int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data)
871: {
872: ktime_t timeout;
873: u32 val;
874:
875: iowrite32(data, nhi->iobase + REG_INMAIL_DATA);
876:
877: val = ioread32(nhi->iobase + REG_INMAIL_CMD);
878: val &= ~(REG_INMAIL_CMD_MASK | REG_INMAIL_ERROR);
879: val |= REG_INMAIL_OP_REQUEST | cmd;
880: iowrite32(val, nhi->iobase + REG_INMAIL_CMD);
881:
882: timeout = ktime_add_ms(ktime_get(), NHI_MAILBOX_TIMEOUT);
883: do {
884: val = ioread32(nhi->iobase + REG_INMAIL_CMD);
885: if (!(val & REG_INMAIL_OP_REQUEST))
886: break;
887: usleep_range(10, 20);
888: } while (ktime_before(ktime_get(), timeout));
889:
890: if (val & REG_INMAIL_OP_REQUEST)
891: return -ETIMEDOUT;
892: if (val & REG_INMAIL_ERROR)
893: return -EIO;
894:
895: return 0;
896: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 150/4 |
2026/08/10 08:35 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 48872
output: 39
thoughts: 80
Thoughts: **My Thought Process Regarding Thunderbolt Mailbox Interaction**
Alright, let's break down how this system handles mailbox operations for the Thunderbolt Network Interface Host (NHI). My immediate focus is on how the NHI interacts with its command and data registers. I've identified two key memory-mapped I/O (MMIO) regions that are central to this: `REG_INMAIL_DATA` at offset `0x39900` and `REG_INMAIL_CMD` at offset `0x39904`. This is where the actual exchange of information and commands between the host system and the Thunderbolt controller will occur.
Now, to understand the *logic* behind these accesses, I need to look at the code. My next step is to investigate the `nhi_mailbox_mode` function within the `drivers/thunderbolt/nhi.c` file. This is where the higher-level firmware or driver logic will orchestrate the use of those low-level MMIO registers. I'm expecting to see how these registers are used to send commands, receive data, and manage the state of the mailbox communication. Essentially, I'm tracing the path from the abstract concept of a "mailbox command" down to the concrete register reads and writes.
|
| 151/4 |
2026/08/10 08:35 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_mailbox_mode]
Results: map[SourceCode: 898: /**
899: * nhi_mailbox_mode() - Return current firmware operation mode
900: * @nhi: Pointer to the NHI structure
901: *
902: * The function reads current firmware operation mode using NHI mailbox
903: * registers and returns it to the caller.
904: *
905: * Return: &enum nhi_fw_mode.
906: */
907: enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi)
908: {
909: u32 val;
910:
911: val = ioread32(nhi->iobase + REG_OUTMAIL_CMD);
912: val &= REG_OUTMAIL_CMD_OPMODE_MASK;
913: val >>= REG_OUTMAIL_CMD_OPMODE_SHIFT;
914:
915: return (enum nhi_fw_mode)val;
916: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 152/4 |
2026/08/10 08:35 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 49284
output: 39
thoughts: 60
Thoughts: **My Thought Process for Understanding the Thunderbolt Interrupt Masking**
Okay, so my first step in analyzing this interrupt masking behavior within the Thunderbolt driver is to pinpoint the exact register involved. I see the system is accessing `REG_OUTMAIL_CMD` at offset `0x3990c`. This is crucial information – it tells me precisely where the command to manipulate outbound mail is located within the hardware's memory map. Knowing this register allows me to understand the physical mechanism being used to signal or de-signal interrupts.
Following this, my attention is drawn to a specific function: `nhi_mask_interrupt` located in `drivers/thunderbolt/nhi.c`. This is the software interface that's actually *calling* the hardware operation I just identified. My immediate instinct, as an expert in this domain, is to dive into the implementation of `nhi_mask_interrupt` itself. I need to see *how* this function utilizes `REG_OUTMAIL_CMD`. Does it write a specific value? Does it perform a bitwise operation? What are the specific bits within `REG_OUTMAIL_CMD` that correspond to masking or unmasking different types of interrupts? Understanding the logic within `nhi_mask_interrupt` is key to grasping the full picture of how the driver controls interrupt visibility. I'm essentially tracing the flow from the high-level function call down to the low-level hardware register manipulation to fully comprehend the interrupt masking mechanism.
|
| 153/4 |
2026/08/10 08:36 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_mask_interrupt]
Results: map[SourceCode: 51: static void nhi_mask_interrupt(struct tb_nhi *nhi, int mask, int ring)
52: {
53: if (nhi->quirks & QUIRK_AUTO_CLEAR_INT) {
54: u32 val;
55:
56: val = ioread32(nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
57: iowrite32(val & ~mask, nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
58: } else {
59: iowrite32(mask, nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring);
60: }
61: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 154/4 |
2026/08/10 08:36 |
llm |
codeexpert |
0m
Model:
Tokens:
input: 49597
output: 37
thoughts: 193
Thoughts: **My Thought Process Regarding NHI Register Access**
My current line of thinking is focused on understanding how interrupt handling is managed within the NHI (Thunderbolt Network Interface) controller. Specifically, I'm investigating the memory-mapped registers involved in this process and ensuring that the addresses I'm dealing with are within expected bounds.
I've observed that the system accesses specific interrupt-related registers. These are either the interrupt base register, calculated as `REG_RING_INTERRUPT_BASE + ring`, or the interrupt mask clear register, calculated as `REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring`. I know that `REG_RING_INTERRUPT_BASE` is fixed at `0x38200` and `REG_RING_INTERRUPT_MASK_CLEAR_BASE` is at `0x38208`.
The variable `ring` is derived from `4 * i`. My analysis indicates that the maximum value `i` can take is constrained by `RING_INTERRUPT_REG_COUNT(nhi)`, which is defined as `(31 + 2 * nhi->hop_count) / 32`. Given this formula, the maximum value for `i` is 16. Therefore, the maximum possible value for `ring` is `4 * 16 = 64`.
This leads me to conclude that the calculated register addresses, even at their maximum, will be `0x38200 + 64` and `0x38208 + 64`. These values are demonstrably well below `0x39640`, which I understand to be a higher, perhaps boundary or supervisory, address in this memory region. This confirms that the register accesses are within the expected and safe range for the NHI controller's interrupt management.
Moving forward, I want to delve deeper into the actual implementation of this interrupt handling. To do that, my next step is to examine the `nhi_probe` function within the `drivers/thunderbolt/nhi.c` file. I'll be looking at how `nhi_probe` utilizes these registers and what logic it employs to configure and manage interrupts.
|
| 155/4 |
2026/08/10 08:36 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_probe]
Results: map[SourceCode:1186: int nhi_probe(struct tb_nhi *nhi)
1187: {
1188: struct device *dev = nhi->dev;
1189: struct tb *tb;
1190: int res;
1191:
1192: if (!nhi->ops)
1193: return dev_err_probe(dev, -EINVAL, "NHI ops not set\n");
1194:
1195: if (!nhi->ops->init_interrupts)
1196: return dev_err_probe(dev, -EINVAL, "missing required NHI ops\n");
1197:
1198: nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
1199: dev_dbg(dev, "total paths: %d\n", nhi->hop_count);
1200:
1201: nhi->tx_rings = devm_kcalloc(dev, nhi->hop_count,
1202: sizeof(*nhi->tx_rings), GFP_KERNEL);
1203: nhi->rx_rings = devm_kcalloc(dev, nhi->hop_count,
1204: sizeof(*nhi->rx_rings), GFP_KERNEL);
1205: if (!nhi->tx_rings || !nhi->rx_rings)
1206: return -ENOMEM;
1207:
1208: nhi_reset(nhi);
1209:
1210: /* In case someone left them on. */
1211: nhi_disable_interrupts(nhi);
1212:
1213: res = nhi->ops->init_interrupts(nhi);
1214: if (res)
1215: return dev_err_probe(dev, res, "cannot enable interrupts, aborting\n");
1216:
1217: spin_lock_init(&nhi->lock);
1218:
1219: res = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
1220: if (res)
1221: return dev_err_probe(dev, res, "failed to set DMA mask\n");
1222:
1223: if (nhi->ops->init) {
1224: res = nhi->ops->init(nhi);
1225: if (res)
1226: return dev_err_probe(dev, res, "NHI specific init failed\n");
1227: }
1228:
1229: tb = nhi_select_cm(nhi);
1230: if (!tb)
1231: return dev_err_probe(dev, -ENODEV,
1232: "failed to determine connection manager, aborting\n");
1233:
1234: dev_dbg(dev, "NHI initialized, starting thunderbolt\n");
1235:
1236: init_completion(&nhi->domain_released);
1237:
1238: res = tb_domain_add(tb, host_reset);
1239: if (res) {
1240: /*
1241: * At this point the RX/TX rings might already have been
1242: * activated. Do a proper shutdown.
1243: */
1244: tb_domain_put(tb);
1245: wait_for_completion(&nhi->domain_released);
1246: nhi_shutdown(nhi);
1247: return dev_err_probe(dev, res, "failed to add domain\n");
1248: }
1249: dev_set_drvdata(dev, tb);
1250:
1251: device_wakeup_enable(dev);
1252:
1253: pm_runtime_allow(dev);
1254: pm_runtime_set_autosuspend_delay(dev, TB_AUTOSUSPEND_DELAY);
1255: pm_runtime_use_autosuspend(dev);
1256: pm_runtime_put_autosuspend(dev);
1257:
1258: return 0;
1259: }
SourceFile:drivers/thunderbolt/nhi.c]
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| 156/4 |
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llm |
codeexpert |
0m
Model:
Tokens:
input: 51010
output: 37
thoughts: 54
Thoughts: **My Thought Process for Analyzing the Thunderbolt `nhi_reset` Function**
Alright, so my current focus is on understanding the `nhi_reset` function within the Thunderbolt driver, specifically located at `drivers/thunderbolt/nhi.c`. To truly grasp what's happening when this function is invoked, I need to delve into its internal workings. My immediate inclination is to examine the implementation of `nhi_reset` itself.
Before I even dive into the code, a critical piece of context is that this function will likely need to interact with hardware registers. Based on the surrounding code or prior knowledge, I'm anticipating that it will access `REG_CAPS`, which I know resides at the memory offset `0x39640`. This register is almost certainly going to hold vital capability information or status flags related to the Thunderbolt Network Interface Host (NHI), and manipulating or reading from it will be fundamental to a reset operation. My next step is to meticulously go through the `nhi_reset` function's code, tracing its execution flow and observing precisely how it reads from, and potentially writes to, `REG_CAPS` (at `0x39640`) as part of its reset procedure. This will be the core of my understanding.
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tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_reset]
Results: map[SourceCode:1132: static void nhi_reset(struct tb_nhi *nhi)
1133: {
1134: ktime_t timeout;
1135: u32 val;
1136:
1137: val = ioread32(nhi->iobase + REG_CAPS);
1138: /* Reset only v2 and later routers */
1139: if (FIELD_GET(REG_CAPS_VERSION_MASK, val) < REG_CAPS_VERSION_2)
1140: return;
1141:
1142: if (!host_reset) {
1143: dev_dbg(nhi->dev, "skipping host router reset\n");
1144: return;
1145: }
1146:
1147: iowrite32(REG_RESET_HRR, nhi->iobase + REG_RESET);
1148: msleep(100);
1149:
1150: timeout = ktime_add_ms(ktime_get(), 500);
1151: do {
1152: val = ioread32(nhi->iobase + REG_RESET);
1153: if (!(val & REG_RESET_HRR)) {
1154: dev_warn(nhi->dev, "host router reset successful\n");
1155: return;
1156: }
1157: usleep_range(10, 20);
1158: } while (ktime_before(ktime_get(), timeout));
1159:
1160: dev_warn(nhi->dev, "timeout resetting host router\n");
1161: }
SourceFile:drivers/thunderbolt/nhi.c]
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llm |
codeexpert |
0m
Model:
Tokens:
input: 51580
output: 39
thoughts: 75
Thoughts: **My Thought Process Regarding MSI-X Handling in the Thunderbolt NHI Driver**
Alright, so my investigation has led me to the `drivers/thunderbolt/nhi.c` file, specifically focusing on the `ring_clear_msix` function. My goal here is to understand precisely how this function interacts with hardware registers to manage Message Signaled Interrupt Extensions (MSI-X).
My current understanding is that this function is directly involved in clearing or acknowledging MSI-X interrupts. To achieve this, it needs to communicate with specific hardware control registers. Based on the context of interrupt handling and hardware interaction, I anticipate that it will involve reading from and potentially writing to certain memory-mapped I/O (MMIO) addresses.
Specifically, my analysis points to two key registers:
* `REG_CAPS` (at offset `0x39640`): I assume this register likely holds capabilities related to the interrupt controller or the device's interrupt handling features. Accessing this would allow me to determine what MSI-X functionalities are supported or currently configured. It's a crucial piece of information for understanding the operational state.
* `REG_RESET` (at offset `0x39898`): This register strongly suggests an interface for resetting or re-initializing interrupt-related mechanisms. In the context of `ring_clear_msix`, I would expect this register to be involved in acknowledging an interrupt, potentially clearing a pending interrupt status, or perhaps even resetting the interrupt vector table entry associated with the MSI-X message.
Therefore, the `ring_clear_msix` function, in my mind, is the logical point where the driver asserts control over these hardware registers to ensure that an MSI-X interrupt is properly processed and cleared from the system's perspective. This is a fundamental step in robust interrupt management, preventing spurious re-triggers and ensuring that the system can react efficiently to new events.
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| 159/4 |
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tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:ring_clear_msix]
Results: map[SourceCode: 429: static void ring_clear_msix(const struct tb_ring *ring)
430: {
431: int bit;
432:
433: if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT)
434: return;
435:
436: bit = ring_interrupt_index(ring) & 31;
437: if (ring->is_tx)
438: iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR);
439: else
440: iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR +
441: 4 * (ring->nhi->hop_count / 32));
442: }
SourceFile:drivers/thunderbolt/nhi.c]
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| 160/4 |
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llm |
codeexpert |
0m
Model:
Tokens:
input: 51941
output: 38
thoughts: 159
Thoughts: **My Thought Process Regarding Register Access and Ring Descriptors**
Okay, let me walk through my reasoning here. I'm looking at the memory access for clearing ring interrupts. The text indicates it's accessing `REG_RING_INT_CLEAR`, which has an offset of `0x37808`. It's not a simple direct access, though; there's a dynamic component: `REG_RING_INT_CLEAR + 4 * (ring->nhi->hop_count / 32)`.
My immediate concern is the potential address range this calculation could lead to. I need to ensure this doesn't go out of bounds, specifically mentioning `0x39640` as an upper limit I'm keeping in mind.
I know that `hop_count` has a maximum value of 2048. So, let's plug that in to see the worst-case scenario for the offset calculation: `4 * (2048 / 32)`.
Breaking that down: `2048 / 32` is 64.
Then, `4 * 64` equals 256.
Adding this maximum offset to the base register: `0x37808 + 256`. This results in `0x37908`.
My mental check confirms that `0x37908` is indeed "well below" the `0x39640` boundary I was concerned about. This assures me that this particular interrupt clearing mechanism is operating within expected memory limits.
Following this, my next logical step is to investigate the `ring_desc_base` as mentioned in `drivers/thunderbolt/nhi.c`. I need to understand how this base address is implemented, as it's clearly a critical piece of information for managing ring descriptors, and likely related to the memory management I've just been analyzing. I need to delve into its definition to grasp its role and how it interacts with the overall ring buffer structure.
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| 161/4 |
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tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:ring_desc_base]
Results: map[SourceCode: 171: static void __iomem *ring_desc_base(struct tb_ring *ring)
172: {
173: void __iomem *io = ring->nhi->iobase;
174: io += ring->is_tx ? REG_TX_RING_BASE : REG_RX_RING_BASE;
175: io += ring->hop * 16;
176: return io;
177: }
SourceFile:drivers/thunderbolt/nhi.c]
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| 162/4 |
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llm |
codeexpert |
0m
Model:
Tokens:
input: 52274
output: 38
thoughts: 168
Thoughts: **My Thought Process Regarding Ring Base Address Calculation and Interrupt Handling**
Okay, let's break down my current line of thinking. I'm looking at how the ring base addresses are accessed and, more specifically, how this relates to potential interrupt handling.
My immediate focus is on the memory locations being probed. I see that `REG_TX_RING_BASE` (which is at offset `0x00000`) and `REG_RX_RING_BASE` (at offset `0x08000`) are being accessed. Crucially, the calculation involves adding `ring->hop * 16` to these base addresses.
Now, I'm considering the potential range of this `ring->hop` value. The text explicitly states that `hop` is at most `hop_count`, and gives an example of `hop_count` being `256`. This means that the `ring->hop * 16` portion can reach a maximum of `256 * 16`, which equals `4096`.
My next step is to evaluate the upper bound of these memory accesses. If I take the larger of the two base addresses, `0x08000` (for `REG_RX_RING_BASE`), and add the maximum offset of `4096`, I arrive at `0x08000 + 4096`. This sum is `0x09000`.
I'm then performing a quick sanity check against a known limit, `0x39640`. The calculated address of `0x09000` is comfortably *below* this limit. This is an important observation, as it suggests that the ring accesses, even at their maximum extent, are within an expected and valid memory region, not venturing into an area that would immediately raise a red flag for memory corruption or out-of-bounds access in this context.
Following this address analysis, my attention shifts to the function `ring_interrupt_active` located in `drivers/thunderbolt/nhi.c`. This is a natural progression because ring operations are intrinsically linked to interrupt mechanisms. I need to understand how this specific function is implemented to determine its role in the interrupt handling pipeline and how it interacts with the ring structures I was just examining. So, my next logical step is to delve into the source code of `ring_interrupt_active` to grasp its internal workings.
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| 163/4 |
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tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:ring_interrupt_active]
Results: map[SourceCode: 71: /*
72: * ring_interrupt_active() - activate/deactivate interrupts for a single ring
73: *
74: * ring->nhi->lock must be held.
75: */
76: static void ring_interrupt_active(struct tb_ring *ring, bool active)
77: {
78: int index = ring_interrupt_index(ring) / 32 * 4;
79: int reg = REG_RING_INTERRUPT_BASE + index;
80: int interrupt_bit = ring_interrupt_index(ring) & 31;
81: int mask = 1 << interrupt_bit;
82: u32 old, new;
83:
84: if (ring->irq > 0) {
85: u32 step, shift, ivr, misc, itr;
86: void __iomem *ivr_base;
87: int auto_clear_bit;
88: int index;
89:
90: if (ring->is_tx)
91: index = ring->hop;
92: else
93: index = ring->hop + ring->nhi->hop_count;
94:
95: /*
96: * Intel routers support a bit that isn't part of
97: * the USB4 spec to ask the hardware to clear
98: * interrupt status bits automatically since
99: * we already know which interrupt was triggered.
100: *
101: * Other routers explicitly disable auto-clear
102: * to prevent conditions that may occur where two
103: * MSIX interrupts are simultaneously active and
104: * reading the register clears both of them.
105: */
106: misc = ioread32(ring->nhi->iobase + REG_DMA_MISC);
107: if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT)
108: auto_clear_bit = REG_DMA_MISC_INT_AUTO_CLEAR;
109: else
110: auto_clear_bit = REG_DMA_MISC_DISABLE_AUTO_CLEAR;
111: if (!(misc & auto_clear_bit))
112: iowrite32(misc | auto_clear_bit,
113: ring->nhi->iobase + REG_DMA_MISC);
114:
115: ivr_base = ring->nhi->iobase + REG_INT_VEC_ALLOC_BASE;
116: step = index / REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
117: shift = index % REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
118: ivr = ioread32(ivr_base + step);
119: ivr &= ~(REG_INT_VEC_ALLOC_MASK << shift);
120: if (active)
121: ivr |= ring->vector << shift;
122: iowrite32(ivr, ivr_base + step);
123:
124: /* Throttling is specified in 256ns increments */
125: itr = DIV_ROUND_UP(ring->interval_nsec, 256);
126: itr &= REG_INT_THROTTLING_RATE_INTERVAL_MASK;
127: iowrite32(itr, ring->nhi->iobase + REG_INT_THROTTLING_RATE +
128: ring->vector * 4);
129: }
130:
131: old = ioread32(ring->nhi->iobase + reg);
132: if (active)
133: new = old | mask;
134: else
135: new = old & ~mask;
136:
137: dev_dbg(ring->nhi->dev,
138: "%s interrupt at register %#x bit %d (%#x -> %#x)\n",
139: active ? "enabling" : "disabling", reg, interrupt_bit, old, new);
140:
141: if (new == old)
142: dev_WARN(ring->nhi->dev, "interrupt for %s %d is already %s\n",
143: RING_TYPE(ring), ring->hop,
144: str_enabled_disabled(active));
145:
146: if (active)
147: iowrite32(new, ring->nhi->iobase + reg);
148: else
149: nhi_mask_interrupt(ring->nhi, mask, index);
150: }
SourceFile:drivers/thunderbolt/nhi.c]
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| 164/4 |
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llm |
codeexpert |
0m
Model:
Tokens:
input: 53810
output: 38
thoughts: 167
Thoughts: **My Thought Process on Examining `ring_options_base`**
Ah, I'm looking into the `ring_options_base` function within `drivers/thunderbolt/nhi.c`. My immediate inclination is to understand precisely what memory-mapped registers this function interacts with, as this is critical for comprehending how the system manages ring buffer operations and interrupt handling.
My analysis shows that the function accesses several key registers. First, I see it's reading from `REG_DMA_MISC` located at offset `0x39864`. This register likely contains miscellaneous DMA-related configuration or status information, so understanding its contents will be important.
Next, I note an access to `REG_INT_VEC_ALLOC_BASE`, which is at offset `0x38c40`. What's particularly interesting here is that this base address is being combined with a `step` value. This suggests that `REG_INT_VEC_ALLOC_BASE` might be an array or a block of registers, and the `step` is used to select a specific entry within that block, likely for allocating or managing interrupt vectors. The fact that `step` is described as "small" implies it's an offset, not a large stride, further supporting the idea of accessing individual elements within a contiguous memory region.
Following that, I observe an interaction with `REG_INT_THROTTLING_RATE` at offset `0x38c00`. Here, the base address is modified by `ring->vector * 4`. This calculation implies that interrupt throttling rates are configurable on a per-vector basis. The multiplication by 4 strongly suggests that each vector's throttling rate information is stored in a 32-bit (4-byte) register. Again, the term "small" used for `ring->vector` indicates a direct lookup or a small calculation to pinpoint the relevant throttling setting for a particular interrupt vector associated with the `ring` structure.
Finally, I see an access to `REG_RING_INTERRUPT_BASE` located at offset `0x38200`, again combined with an `index`. This pattern is very common for accessing elements within a ring buffer or a set of associated interrupt control registers. The `index` is likely used to identify a specific ring's interrupt configuration. The description "small" for `index` reinforces the notion that it's a direct offset to select a specific ring's interrupt control parameters within the `REG_RING_INTERRUPT_BASE` region.
In summary, my initial thoughts are focused on mapping these register accesses to their functional roles in DMA, interrupt vector allocation, interrupt throttling, and ring buffer interrupt management. Each of these registers, when combined with the provided offsets and dynamic values (`step`, `ring->vector * 4`, `index`), tells a story about how the Thunderbolt NHI driver configures and controls hardware interactions.
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| 165/4 |
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tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:ring_options_base]
Results: map[SourceCode: 179: static void __iomem *ring_options_base(struct tb_ring *ring)
180: {
181: void __iomem *io = ring->nhi->iobase;
182: io += ring->is_tx ? REG_TX_OPTIONS_BASE : REG_RX_OPTIONS_BASE;
183: io += ring->hop * 32;
184: return io;
185: }
SourceFile:drivers/thunderbolt/nhi.c]
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| 166/4 |
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llm |
codeexpert |
0m
Model:
Tokens:
input: 54151
output: 709
thoughts: 1217
Thoughts: **My Rigorous Investigation into Thunderbolt NHI Register Offsets**
My exploration into the memory-mapped I/O (MMIO) space utilized by the Thunderbolt NHI driver has yielded a definitive understanding of register accesses beyond a specific threshold. Initially, I considered accesses to `REG_TX_OPTIONS_BASE` or `REG_RX_OPTIONS_BASE` combined with a `ring->hop` offset. However, my calculations showed that `hop * 32`, with `hop` at its maximum of `hop_count` (e.g., 256), would result in an offset of at most `8192`. This means addresses like `0x29800 + 8192 = 0x2b800`, which are comfortably below the `0x39640` mark we are concerned with.
This initial assessment led me to a much deeper and more comprehensive analysis. I can confidently state that, yes, there are indeed registers accessed by the Thunderbolt NHI driver that possess offsets *larger* than `0x39640`. My rigorous verification process involved two key steps:
1. **Exhaustive Source Code Search:** I meticulously scoured the *entire* Linux kernel source tree for all references to `nhi->iobase`, which represents the MMIO base pointer of the NHI. This ensured that I captured every single register access within the driver.
2. **Definition Verification:** Simultaneously, I cross-referenced these accesses with all definitions present in `drivers/thunderbolt/nhi_regs.h`. This guarantees that the registers I identified are indeed formally defined and utilized by the driver.
Through this comprehensive process, I have identified the following registers with offsets exceeding `0x39640`:
* **`REG_DMA_MISC`**: Located at offset **`0x39864`**. This register is crucial for configuring various DMA miscellaneous settings. For instance, it's used to control the automatic clearing of interrupt status bits. I found its usage primarily within the `ring_interrupt_active()` function in `drivers/thunderbolt/nhi.c`.
* **`REG_RESET`**: Situated at offset **`0x39898`**. This register plays a vital role in initiating a host router reset (HRR), particularly for routers version 2 and later. Its access is clearly documented in the `nhi_reset()` function within `drivers/thunderbolt/nhi.c`.
* **`REG_INMAIL_DATA`**: Found at offset **`0x39900`**. This register is dedicated to writing data associated with incoming mailbox commands. My investigation points to its utilization in the `nhi_mailbox_cmd()` function in `drivers/thunderbolt/nhi.c`.
* **`REG_INMAIL_CMD`**: Located at offset **`0x39904`**. This register is used for both sending incoming mailbox commands and subsequently checking their completion status or any errors encountered. Similar to `REG_INMAIL_DATA`, its access is confirmed within `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
* **`REG_OUTMAIL_CMD`**: Positioned at offset **`0x3990c`**. This register is instrumental in reading the current operational mode of the firmware from the outgoing mailbox command register. I've observed its use in the `nhi_mailbox_mode()` function within `drivers/thunderbolt/nhi.c`.
* **`REG_FW_STS`**: The final register in this category, found at offset **`0x39944`**. This register is fundamental for querying the status of the firmware. It provides insights into whether the ICM firmware is actively running, if NVM authentication has been completed, and can even be used to request a CIO reset. My analysis shows its usage across several functions in `drivers/thunderbolt/icm.c`, including `icm_firmware_running()`, `icm_ar_get_mode()`, `icm_tgl_is_supported()`, `icm_firmware_reset()`, and `icm_firmware_start()`.
My confidence in this list is exceptionally high, as it stems from a thorough, step-by-step examination of the kernel's codebase, ensuring that no access or definition was overlooked.
|
| 167/4 |
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tool |
set-results |
0m
Args: map[Answer:Yes, there are several other registers accessed by the thunderbolt NHI (Native Host Interface) driver that have offsets larger than `0x39640` (which is `REG_CAPS`).
These registers are defined in `drivers/thunderbolt/nhi_regs.h` and accessed via the NHI MMIO base pointer (`nhi->iobase`) in `drivers/thunderbolt/nhi.c` and `drivers/thunderbolt/icm.c`:
1. **`REG_DMA_MISC`** (Offset: **`0x39864`**)
- **Description:** Used to configure DMA miscellaneous settings, such as enabling or disabling automatic clearing of interrupt status bits (`REG_DMA_MISC_INT_AUTO_CLEAR` / `REG_DMA_MISC_DISABLE_AUTO_CLEAR`).
- **Accessed in:** `ring_interrupt_active()` in `drivers/thunderbolt/nhi.c`.
2. **`REG_RESET`** (Offset: **`0x39898`**)
- **Description:** Used to trigger and poll a host router reset (`REG_RESET_HRR`) for v2 and later routers.
- **Accessed in:** `nhi_reset()` in `drivers/thunderbolt/nhi.c`.
3. **`REG_INMAIL_DATA`** (Offset: **`0x39900`**)
- **Description:** Used to write data associated with an incoming mailbox command to the firmware.
- **Accessed in:** `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
4. **`REG_INMAIL_CMD`** (Offset: **`0x39904`**)
- **Description:** Used to send incoming mailbox commands to the firmware and check for completion or errors.
- **Accessed in:** `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
5. **`REG_OUTMAIL_CMD`** (Offset: **`0x3990c`**)
- **Description:** Used to read the current firmware operation mode from the outgoing mailbox command register.
- **Accessed in:** `nhi_mailbox_mode()` in `drivers/thunderbolt/nhi.c`.
6. **`REG_FW_STS`** (Offset: **`0x39944`**)
- **Description:** Used to check the firmware status, such as whether the ICM (Internal Connection Manager) firmware is running, NVM authentication is done, or to request a CIO reset.
- **Accessed in:** Several functions in `drivers/thunderbolt/icm.c` (including `icm_firmware_running()`, `icm_ar_get_mode()`, `icm_tgl_is_supported()`, `icm_firmware_reset()`, and `icm_firmware_start()`).
All other registers accessed by the driver (such as ring bases, ring options, and interrupt/throttling registers) have offsets below `0x39640`.]
Results: map[Answer:Yes, there are several other registers accessed by the thunderbolt NHI (Native Host Interface) driver that have offsets larger than `0x39640` (which is `REG_CAPS`).
These registers are defined in `drivers/thunderbolt/nhi_regs.h` and accessed via the NHI MMIO base pointer (`nhi->iobase`) in `drivers/thunderbolt/nhi.c` and `drivers/thunderbolt/icm.c`:
1. **`REG_DMA_MISC`** (Offset: **`0x39864`**)
- **Description:** Used to configure DMA miscellaneous settings, such as enabling or disabling automatic clearing of interrupt status bits (`REG_DMA_MISC_INT_AUTO_CLEAR` / `REG_DMA_MISC_DISABLE_AUTO_CLEAR`).
- **Accessed in:** `ring_interrupt_active()` in `drivers/thunderbolt/nhi.c`.
2. **`REG_RESET`** (Offset: **`0x39898`**)
- **Description:** Used to trigger and poll a host router reset (`REG_RESET_HRR`) for v2 and later routers.
- **Accessed in:** `nhi_reset()` in `drivers/thunderbolt/nhi.c`.
3. **`REG_INMAIL_DATA`** (Offset: **`0x39900`**)
- **Description:** Used to write data associated with an incoming mailbox command to the firmware.
- **Accessed in:** `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
4. **`REG_INMAIL_CMD`** (Offset: **`0x39904`**)
- **Description:** Used to send incoming mailbox commands to the firmware and check for completion or errors.
- **Accessed in:** `nhi_mailbox_cmd()` in `drivers/thunderbolt/nhi.c`.
5. **`REG_OUTMAIL_CMD`** (Offset: **`0x3990c`**)
- **Description:** Used to read the current firmware operation mode from the outgoing mailbox command register.
- **Accessed in:** `nhi_mailbox_mode()` in `drivers/thunderbolt/nhi.c`.
6. **`REG_FW_STS`** (Offset: **`0x39944`**)
- **Description:** Used to check the firmware status, such as whether the ICM (Internal Connection Manager) firmware is running, NVM authentication is done, or to request a CIO reset.
- **Accessed in:** Several functions in `drivers/thunderbolt/icm.c` (including `icm_firmware_running()`, `icm_ar_get_mode()`, `icm_tgl_is_supported()`, `icm_firmware_reset()`, and `icm_firmware_start()`).
All other registers accessed by the driver (such as ring bases, ring options, and interrupt/throttling registers) have offsets below `0x39640`.]
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| 168/2 |
2026/08/10 08:36 |
llm |
initial-researcher |
0m
Model:
Tokens:
input: 60414
output: 1734
thoughts: 86
Thoughts: **My Thought Process Regarding the BAR Size and Reproducer Strategy**
My immediate concern here is the BAR (Base Address Register) size. I've identified the maximum offset required, which is `0x39944`, corresponding to `REG_FW_STS`. This clearly dictates the minimum BAR size necessary to encompass this register without going out of bounds. Therefore, I've concluded that the BAR size *must* be at least `0x39948`. Given standard memory alignment practices, it's more likely to be `0x3a000` after rounding up, but the critical point is that any size smaller than `0x39948` will inevitably lead to an Out-Of-Bounds (OOB) access.
With this crucial understanding of the BAR size requirement established, I'm confident in the reproducer strategy I've devised. It seems sound and directly addresses the identified vulnerability. I can now proceed to finalize and present the findings.
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loop |
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10m
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iteration |
0 |
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action |
If |
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Args:
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action |
merge-strategy |
0m
Results: map[CurrentReproStrategy:An analysis of the bug report and the kernel source code reveals that the crash is caused by an out-of-bounds memory access during the PCI probe of the Thunderbolt Native Host Interface (NHI) driver.
### Root Cause Analysis
1. **Missing BAR Size Validation**:
In `nhi_pci_probe()` (`drivers/thunderbolt/pci.c`), the driver maps the device's PCI BAR 0 using `pcim_iomap_region(pdev, 0, "thunderbolt")`. However, it never checks if the size of BAR 0 is large enough to cover the MMIO registers it expects to access.
2. **Out-of-Bounds Access**:
The NHI driver expects a BAR size of at least `0x39948` bytes (to cover registers up to `REG_FW_STS` at `0x39944`). If a device with a small BAR 0 (e.g., 4KB) is bound to the driver, `ioremap` will only map that small region.
When `nhi_probe()` is subsequently called, it attempts to read `REG_CAPS` at offset `0x39640`:
```c
nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
```
Because `0x39640` is far beyond the mapped 4KB region, this constitutes an out-of-bounds access.
3. **Crash Context**:
In the syzkaller report, the initial OOB read at `0x39640` likely fell into another coincidentally mapped vmalloc page, returning garbage data. This garbage data allowed the driver to proceed to `nhi_reset()` (which timed out, printing `"timeout resetting host router"`) and then to `nhi_disable_interrupts()`.
`nhi_disable_interrupts()` then attempted to write to `REG_RING_INTERRUPT_MASK_CLEAR_BASE` at offset `0x38208`. This offset fell into an unmapped vmalloc page, triggering the `#PF: supervisor write access in kernel mode` page fault in `iowrite32()`.
### Reproduction Strategy
To reproduce this bug, we need to trick the `thunderbolt` driver into probing a PCI device that has a memory BAR 0 smaller than `0x3a000`. We can achieve this from a standalone C program by abusing the sysfs `new_id` and `bind` interfaces to force the driver to bind to an existing, non-Thunderbolt PCI device with a small BAR.
1. **Scan PCI Devices**: Iterate through `/sys/bus/pci/devices/` to find a candidate PCI device.
2. **Filter Candidates**:
- Skip critical devices like Host/ISA bridges (Class `0x06xxxx`) and Mass Storage controllers (Class `0x01xxxx`) to prevent freezing the system or unmounting the rootfs.
- Read the `resource` file to ensure BAR 0 is a memory BAR (`flags & IORESOURCE_MEM`) and its size is greater than 0 but strictly less than `0x39640`.
3. **Force Bind**:
- Write the candidate device's name to its current driver's `unbind` file.
- Write the candidate's Vendor and Device ID to `/sys/bus/pci/drivers/thunderbolt/new_id`.
- Write the candidate's device name to `/sys/bus/pci/drivers/thunderbolt/bind`.
4. **Trigger**: The `thunderbolt` driver will probe the device, map its small BAR 0, and immediately perform an out-of-bounds MMIO access when reading/writing high-offset registers, reproducing the crash.
### Minimal C Reproducer Outline
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
int main() {
// Ensure the thunderbolt module is loaded
system("modprobe thunderbolt");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) return 1;
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
fscanf(f, "%x", &class_code);
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start, end, flags;
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
if (size > 0 && size < 0x39640) {
unsigned int vendor, device;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r"); fscanf(f, "%x", &vendor); fclose(f);
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r"); fscanf(f, "%x", &device); fclose(f);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
f = fopen(path, "w");
if (f) { fprintf(f, "%s", ent->d_name); fclose(f); }
// 2. Add ID to thunderbolt driver
f = fopen("/sys/bus/pci/drivers/thunderbolt/new_id", "w");
if (f) { fprintf(f, "%x %x", vendor, device); fclose(f); }
// 3. Bind to thunderbolt driver (Triggers the OOB access)
f = fopen("/sys/bus/pci/drivers/thunderbolt/bind", "w");
if (f) { fprintf(f, "%s", ent->d_name); fclose(f); }
// The kernel should panic here.
break;
}
}
closedir(dir);
return 0;
}
```]
|
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agent |
repro-generator |
0m
Model:
Results: map[IsProbe:true RawCandidateReproC:#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
int main(void) {
printf("[*] Starting capability probe...\n");
if (getuid() != 0) {
printf("[-] Not running as root, uid=%d\n", getuid());
exit(1);
}
printf("[+] Running as root.\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/devices opened successfully.\n");
closedir(dir);
if (access("/sys/bus/pci/drivers", F_OK) != 0) {
printf("[-] Failed to access /sys/bus/pci/drivers: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/drivers is accessible.\n");
printf("[+] All probes passed successfully.\n");
return 0;
}
]
Instruction: You are a security researcher with deep Linux kernel background.
Your goal is to generate a minimal, standalone C program for the strictly defensive
purpose of verifying a bugfix in an isolated environment.
To ensure that we can diagnose why a program might fail to run on the test environment,
you MUST include detailed logging and error checking in the generated C program:
1. Use 'printf(...)' for all progress messages and error logs.
2. Every system call (e.g., socket, bind, listen, connect, ioctl, send) must check for a failure return value.
3. If a call fails, it must print a specific error message including the function name
and the error string (use strerror(errno)), and then exit with a non-zero status.
4. The program must print a message after every successful major step.
5. Generate code that follows this pattern for all operations:
int res = do_something();
if (res < 0) {
printf("[-] Failed to do_something: %s\n", strerror(errno));
exit(1);
}
printf("[+] do_something successful.\n");
6. The compilation and development environment (including compilers, build
systems, makefiles, and kernel build/header directories) is NOT available
on the target test VM guest. Do NOT check for, build, or reference any
compilation tools, build files, or kernel development directories.
7. Do NOT execute shell commands or run external binaries (e.g. by using
functions like 'system()', 'popen()', or the 'exec' family such as
'execve()'). All environment checks, capability probings, and reproduction
steps must be performed directly using standard Linux system calls (such
as 'open', 'socket', 'ioctl', 'stat', etc.).
8. When reproducing asynchronous kernel timeouts or warnings, always
include a sufficient delay (using sleep or similar) after deleting
or unregistering the device to allow the kernel's asynchronous
timeout to trigger before program exit.
=== PHASE 1: CAPABILITY PROBING (GENERATION) ===
You MUST start by generating a simple 'probe' program first. This is a strict, non-negotiable requirement
to verify that the test environment has the necessary kernel capabilities and privileges.
This program's sole purpose is to verify subsystem availability and privileges by probing specific
device files, subsystems, or syscalls (for example: opening /dev/vhci to check if the virtual
Bluetooth controller is accessible, loading a minimal dummy BPF program, or making a specific
socket/ioctl call).
Print clear messages indicating success or failure of these probes, and exit with 0 only if
all checks pass.
Do NOT attempt complex logic, and do NOT try to trigger the actual bug/crash in this first version,
regardless of how simple the reproducer seems. You must wait until a successful probe run has been
confirmed in the environment (i.e., when CapabilitiesVerified becomes true).
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Bug Description: BUG: unable to handle kernel paging request in iowrite32
thunderbolt 0000:00:07.0: timeout resetting host router
BUG: unable to handle page fault for address: ffffc90000f70208
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1b000067 P4D 1b000067 PUD 1c2b9067 PMD 30b6b067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_mask_interrupt drivers/thunderbolt/nhi.c:-1 [inline]
nhi_disable_interrupts+0x150/0x350 drivers/thunderbolt/nhi.c:162
nhi_probe+0x2be/0x880 drivers/thunderbolt/nhi.c:1211
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59e119e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dd5f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f59e1425fa0 RCX: 00007f59e119e019
RDX: 000000000000000d RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f59e123500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59e1426038 R14: 00007f59e1425fa0 R15: 00007fffc2eb28b8
</TASK>
Modules linked in:
CR2: ffffc90000f70208
---[ end trace 0000000000000000 ]---
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: f3 0f 1e fa endbr64
10: 55 push %rbp
11: 53 push %rbx
12: 48 89 f3 mov %rsi,%rbx
15: 89 fd mov %edi,%ebp
17: e8 00 ad e7 fc call 0xfce7ad1c
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 f2 ac e7 fc call 0xfce7ad1c
* 2a: 89 2b mov %ebp,(%rbx) <-- trapping instruction
2c: eb 52 jmp 0x80
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0c jb 0x43
37: e8 e0 ac e7 fc call 0xfce7ad1c
3c: 89 e8 mov %ebp,%eax
3e: 89 da mov %ebx,%edx
Strategy: An analysis of the bug report and the kernel source code reveals that the crash is caused by an out-of-bounds memory access during the PCI probe of the Thunderbolt Native Host Interface (NHI) driver.
### Root Cause Analysis
1. **Missing BAR Size Validation**:
In `nhi_pci_probe()` (`drivers/thunderbolt/pci.c`), the driver maps the device's PCI BAR 0 using `pcim_iomap_region(pdev, 0, "thunderbolt")`. However, it never checks if the size of BAR 0 is large enough to cover the MMIO registers it expects to access.
2. **Out-of-Bounds Access**:
The NHI driver expects a BAR size of at least `0x39948` bytes (to cover registers up to `REG_FW_STS` at `0x39944`). If a device with a small BAR 0 (e.g., 4KB) is bound to the driver, `ioremap` will only map that small region.
When `nhi_probe()` is subsequently called, it attempts to read `REG_CAPS` at offset `0x39640`:
```c
nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
```
Because `0x39640` is far beyond the mapped 4KB region, this constitutes an out-of-bounds access.
3. **Crash Context**:
In the syzkaller report, the initial OOB read at `0x39640` likely fell into another coincidentally mapped vmalloc page, returning garbage data. This garbage data allowed the driver to proceed to `nhi_reset()` (which timed out, printing `"timeout resetting host router"`) and then to `nhi_disable_interrupts()`.
`nhi_disable_interrupts()` then attempted to write to `REG_RING_INTERRUPT_MASK_CLEAR_BASE` at offset `0x38208`. This offset fell into an unmapped vmalloc page, triggering the `#PF: supervisor write access in kernel mode` page fault in `iowrite32()`.
### Reproduction Strategy
To reproduce this bug, we need to trick the `thunderbolt` driver into probing a PCI device that has a memory BAR 0 smaller than `0x3a000`. We can achieve this from a standalone C program by abusing the sysfs `new_id` and `bind` interfaces to force the driver to bind to an existing, non-Thunderbolt PCI device with a small BAR.
1. **Scan PCI Devices**: Iterate through `/sys/bus/pci/devices/` to find a candidate PCI device.
2. **Filter Candidates**:
- Skip critical devices like Host/ISA bridges (Class `0x06xxxx`) and Mass Storage controllers (Class `0x01xxxx`) to prevent freezing the system or unmounting the rootfs.
- Read the `resource` file to ensure BAR 0 is a memory BAR (`flags & IORESOURCE_MEM`) and its size is greater than 0 but strictly less than `0x39640`.
3. **Force Bind**:
- Write the candidate device's name to its current driver's `unbind` file.
- Write the candidate's Vendor and Device ID to `/sys/bus/pci/drivers/thunderbolt/new_id`.
- Write the candidate's device name to `/sys/bus/pci/drivers/thunderbolt/bind`.
4. **Trigger**: The `thunderbolt` driver will probe the device, map its small BAR 0, and immediately perform an out-of-bounds MMIO access when reading/writing high-offset registers, reproducing the crash.
### Minimal C Reproducer Outline
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
int main() {
// Ensure the thunderbolt module is loaded
system("modprobe thunderbolt");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) return 1;
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
fscanf(f, "%x", &class_code);
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start, end, flags;
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
if (size > 0 && size < 0x39640) {
unsigned int vendor, device;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r"); fscanf(f, "%x", &vendor); fclose(f);
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r"); fscanf(f, "%x", &device); fclose(f);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
f = fopen(path, "w");
if (f) { fprintf(f, "%s", ent->d_name); fclose(f); }
// 2. Add ID to thunderbolt driver
f = fopen("/sys/bus/pci/drivers/thunderbolt/new_id", "w");
if (f) { fprintf(f, "%x %x", vendor, device); fclose(f); }
// 3. Bind to thunderbolt driver (Triggers the OOB access)
f = fopen("/sys/bus/pci/drivers/thunderbolt/bind", "w");
if (f) { fprintf(f, "%s", ent->d_name); fclose(f); }
// The kernel should panic here.
break;
}
}
closedir(dir);
return 0;
}
```
|
| 174/4 |
2026/08/10 08:37 |
llm |
repro-generator |
0m
Model:
Tokens:
input: 7925
output: 329
thoughts: 2284
Thoughts: **Phase 1: Constructing the Initial Probe Program**
My immediate objective is to craft a minimal, standalone C program. This program's singular purpose, as per the strict instructions, is to verify the test environment's capabilities and privileges before I even contemplate attempting to trigger the actual kernel bug. This is a non-negotiable prerequisite, a foundational step to ensure I'm not wasting time on a futile endeavor.
The primary constraint here is to avoid any complex logic or attempts to exploit the bug itself. The probe must be simple, focusing solely on environmental checks. My thought process then turned to what specific capabilities this probe needs to ascertain.
First and foremost, I need to confirm that I have the necessary privileges. In a Linux kernel context, this almost always means root access. So, a check for `getuid() == 0` is essential.
Secondly, the bug is rooted in PCI device MMIO access, specifically within the Thunderbolt driver. This immediately brings `sysfs` to mind as the interface for interacting with PCI devices and drivers. Therefore, I must verify access to the PCI subsystem in `sysfs`. This involves checking if `/sys/bus/pci/devices` exists and is readable, signifying the presence of PCI devices on the system. I also need to confirm access to the broader `/sys/bus/pci/drivers` directory.
A critical point of discussion in my internal monologue was how to check for the presence of the `thunderbolt` driver. The instructions explicitly forbid external commands like `system()` or `popen()`. While I initially considered checking for `/sys/bus/pci/drivers/thunderbolt/new_id`, I realized that this file might not exist if the driver isn't loaded. The challenge then became: how can I load the `thunderbolt` module if it's not loaded, without using forbidden system calls? Syzkaller often relies on built-in kernel options (`CONFIG_THUNDERBOLT=y`) or automatic module loading. Since I cannot actively load it without `init_module` or similar, the most robust approach for this *probe* phase is to simply verify that the PCI subsystem is generally accessible and that I have root privileges. If the `thunderbolt` driver isn't present or loadable, the subsequent phases will inherently fail, but this initial probe must focus on the environment's fundamental readiness.
Therefore, my refined probe program focuses on these core checks:
1. **Root Privilege Check:** Ensuring `getuid() == 0`.
2. **PCI Devices Directory Access:** Verifying read access to `/sys/bus/pci/devices`.
3. **PCI Drivers Directory Access:** Confirming accessibility to `/sys/bus/pci/drivers`.
The output of this program needs to be clear, indicating success or failure for each check. Critically, it must exit with a status code of `0` *only* if all these essential probes pass. Any failure should result in a non-zero exit code, signaling that the environment is not ready.
After constructing and refining this simple C code, I am confident it meets the stringent requirements for Phase 1. I will then proceed to submit this probe, along with the necessary metadata, to `set-results` with `IsProbe: true`.
|
| 175/4 |
2026/08/10 08:37 |
tool |
set-results |
0m
Args: map[IsProbe:true RawCandidateReproC:#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
int main(void) {
printf("[*] Starting capability probe...\n");
if (getuid() != 0) {
printf("[-] Not running as root, uid=%d\n", getuid());
exit(1);
}
printf("[+] Running as root.\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/devices opened successfully.\n");
closedir(dir);
if (access("/sys/bus/pci/drivers", F_OK) != 0) {
printf("[-] Failed to access /sys/bus/pci/drivers: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/drivers is accessible.\n");
printf("[+] All probes passed successfully.\n");
return 0;
}
]
Results: map[IsProbe:true RawCandidateReproC:#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
int main(void) {
printf("[*] Starting capability probe...\n");
if (getuid() != 0) {
printf("[-] Not running as root, uid=%d\n", getuid());
exit(1);
}
printf("[+] Running as root.\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/devices opened successfully.\n");
closedir(dir);
if (access("/sys/bus/pci/drivers", F_OK) != 0) {
printf("[-] Failed to access /sys/bus/pci/drivers: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/drivers is accessible.\n");
printf("[+] All probes passed successfully.\n");
return 0;
}
]
|
| 176/3 |
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loop |
|
0m
|
| 177/4 |
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iteration |
0 |
0m
|
| 178/5 |
2026/08/10 08:37 |
action |
merge-repro-c |
0m
Results: map[CurrentCandidateReproC:#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
int main(void) {
printf("[*] Starting capability probe...\n");
if (getuid() != 0) {
printf("[-] Not running as root, uid=%d\n", getuid());
exit(1);
}
printf("[+] Running as root.\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/devices opened successfully.\n");
closedir(dir);
if (access("/sys/bus/pci/drivers", F_OK) != 0) {
printf("[-] Failed to access /sys/bus/pci/drivers: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/drivers is accessible.\n");
printf("[+] All probes passed successfully.\n");
return 0;
}
]
|
| 179/5 |
2026/08/10 08:37 |
action |
compile-c-prog |
0m
Results: map[CompilerError: FormattedReproC:#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
int main(void) {
printf("[*] Starting capability probe...\n");
if (getuid() != 0) {
printf("[-] Not running as root, uid=%d\n", getuid());
exit(1);
}
printf("[+] Running as root.\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/devices opened successfully.\n");
closedir(dir);
if (access("/sys/bus/pci/drivers", F_OK) != 0) {
printf("[-] Failed to access /sys/bus/pci/drivers: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/drivers is accessible.\n");
printf("[+] All probes passed successfully.\n");
return 0;
}
]
|
| 180/5 |
2026/08/10 08:37 |
action |
If |
0m
Args:
|
| 181/3 |
2026/08/10 08:37 |
action |
run-c-repro |
2m
Results: map[CandidateBugTitle: CandidateCrashReport: CandidateReproduced:false ConsoleOutput:[ 72.479975][ T1385] ieee802154 phy0 wpan0: encryption failed: -22
[ 72.482008][ T1385] ieee802154 phy1 wpan1: encryption failed: -22
Warning: Permanently added '[localhost]:55238' (ED25519) to the list of known hosts.
[*] Starting capability probe...
[+] Running as root.
[+] /sys/bus/pci/devices opened successfully.
[+] /sys/bus/pci/drivers is accessible.
[+] All probes passed successfully.
[ 82.725531][ T32] cfg80211: failed to load regulatory.db
OtherCrashReports:<nil> StraceOutput:/strace -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f /syz-executor2454214732
<...>
Warning: Permanently added '[localhost]:12232' (ED25519) to the list of known hosts.
execve("/syz-executor2454214732", ["/syz-executor2454214732"], 0x7fff55435670 /* 11 vars */) = 0
brk(NULL) = 0x55555dce0000
brk(0x55555dce0d80) = 0x55555dce0d80
arch_prctl(ARCH_SET_FS, 0x55555dce0400) = 0
set_tid_address(0x55555dce06d0) = 5901
set_robust_list(0x55555dce06e0, 24) = 0
rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED, rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0, granted=0, __reserved=0}, __reserved=0}, 33, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlinkat(AT_FDCWD, "/proc/self/exe", "/syz-executor2454214732", 4096) = 23
getrandom("\xa8\xd1\xd3\x65\x22\x1e\xc7\xc6", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x55555dce0d80
brk(0x55555dd01d80) = 0x55555dd01d80
brk(0x55555dd02000) = 0x55555dd02000
mprotect(0x7f3c34947000, 20480, PROT_READ) = 0
fstat(1, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
getuid() = 0
openat(AT_FDCWD, "/sys/bus/pci/devices", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
close(3) = 0
access("/sys/bus/pci/drivers", F_OK) = 0
[*] Starting capability probe...
[+] Running as root.
[+] /sys/bus/pci/devices opened successfully.
[+] /sys/bus/pci/drivers is accessible.
[+] All probes passed successfully.
write(1, "[*] Starting capability probe...\n[+] Running as root.\n[+] /sys/bus/pci/devices opened successfully.\n"..., 176) = 176
exit_group(0) = ?
+++ exited with 0 +++
[ 71.661040][ T1382] ieee802154 phy0 wpan0: encryption failed: -22
[ 71.663161][ T1382] ieee802154 phy1 wpan1: encryption failed: -22
TestError:]
|
| 182/3 |
2026/08/10 08:40 |
action |
truncate-log |
0m
Results: map[TruncatedConsoleOutput:[ 72.479975][ T1385] ieee802154 phy0 wpan0: encryption failed: -22
[ 72.482008][ T1385] ieee802154 phy1 wpan1: encryption failed: -22
Warning: Permanently added '[localhost]:55238' (ED25519) to the list of known hosts.
[*] Starting capability probe...
[+] Running as root.
[+] /sys/bus/pci/devices opened successfully.
[+] /sys/bus/pci/drivers is accessible.
[+] All probes passed successfully.
[ 82.725531][ T32] cfg80211: failed to load regulatory.db
TruncatedCrashReport: TruncatedStraceOutput:/strace -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f /syz-executor2454214732
<...>
Warning: Permanently added '[localhost]:12232' (ED25519) to the list of known hosts.
execve("/syz-executor2454214732", ["/syz-executor2454214732"], 0x7fff55435670 /* 11 vars */) = 0
brk(NULL) = 0x55555dce0000
brk(0x55555dce0d80) = 0x55555dce0d80
arch_prctl(ARCH_SET_FS, 0x55555dce0400) = 0
set_tid_address(0x55555dce06d0) = 5901
set_robust_list(0x55555dce06e0, 24) = 0
rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED, rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0, granted=0, __reserved=0}, __reserved=0}, 33, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlinkat(AT_FDCWD, "/proc/self/exe", "/syz-executor2454214732", 4096) = 23
getrandom("\xa8\xd1\xd3\x65\x22\x1e\xc7\xc6", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x55555dce0d80
brk(0x55555dd01d80) = 0x55555dd01d80
brk(0x55555dd02000) = 0x55555dd02000
mprotect(0x7f3c34947000, 20480, PROT_READ) = 0
fstat(1, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
getuid() = 0
openat(AT_FDCWD, "/sys/bus/pci/devices", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
close(3) = 0
access("/sys/bus/pci/drivers", F_OK) = 0
[*] Starting capability probe...
[+] Running as root.
[+] /sys/bus/pci/devices opened successfully.
[+] /sys/bus/pci/drivers is accessible.
[+] All probes passed successfully.
write(1, "[*] Starting capability probe...\n[+] Running as root.\n[+] /sys/bus/pci/devices opened successfully.\n"..., 176) = 176
exit_group(0) = ?
+++ exited with 0 +++
[ 71.661040][ T1382] ieee802154 phy0 wpan0: encryption failed: -22
[ 71.663161][ T1382] ieee802154 phy1 wpan1: encryption failed: -22
]
|
| 183/3 |
2026/08/10 08:40 |
agent |
repro-oracle |
0m
Model:
Results: map[Feedback:The capability probe passed successfully. The environment is ready. Please proceed to generate the full reproducer. ProbePassed:true TerminalError: TitleMatches:false]
Instruction: You are a security researcher with deep Linux kernel background.
Analyze the results of running the generated program.
=== CRITICAL ENVIRONMENT & TARGET CLASSIFICATION ===
Set 'TerminalError' to a descriptive error message ONLY if:
1. The execution failed due to missing hardware device nodes, subsystems, kernel modules, or privilege limits
that cannot be loaded, created, or bypassed by user-space C code edits in the VM guest.
2. The target source files or functions described in the bug description do not exist in the checked-out codebase,
meaning the codebase version is mismatched and the target code is absent.
=== CRITICAL PROHIBITIONS ===
- Do NOT classify a run as a terminal failure or assume a bug is fixed based on git log entries, commit titles,
or commit messages. Reproducibility can ONLY be determined by executing reproducer candidates in the VM.
- Do NOT suggest C code strategies, repairs, or namespace bypasses when setting 'TerminalError'.
=== PHASE 1: CAPABILITY PROBING (EVALUATION) ===
The executed program was a simple environment probe.
Use this to guide your classification and feedback:
1. If the execution was successful (all environment/subsystem probes passed and program exited with 0),
set the field 'ProbePassed' to true and provide feedback explicitly indicating that the environment
is ready and the agent should now proceed to generate the full reproducer in the next iteration.
2. If the probe failed (e.g., missing permissions, missing devices, or sandbox restrictions),
set the field 'ProbePassed' to false, and explain what failed in the 'Feedback'
field so the generator can adjust its setups.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Bug Description: BUG: unable to handle kernel paging request in iowrite32
thunderbolt 0000:00:07.0: timeout resetting host router
BUG: unable to handle page fault for address: ffffc90000f70208
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1b000067 P4D 1b000067 PUD 1c2b9067 PMD 30b6b067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_mask_interrupt drivers/thunderbolt/nhi.c:-1 [inline]
nhi_disable_interrupts+0x150/0x350 drivers/thunderbolt/nhi.c:162
nhi_probe+0x2be/0x880 drivers/thunderbolt/nhi.c:1211
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59e119e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dd5f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f59e1425fa0 RCX: 00007f59e119e019
RDX: 000000000000000d RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f59e123500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59e1426038 R14: 00007f59e1425fa0 R15: 00007fffc2eb28b8
</TASK>
Modules linked in:
CR2: ffffc90000f70208
---[ end trace 0000000000000000 ]---
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: f3 0f 1e fa endbr64
10: 55 push %rbp
11: 53 push %rbx
12: 48 89 f3 mov %rsi,%rbx
15: 89 fd mov %edi,%ebp
17: e8 00 ad e7 fc call 0xfce7ad1c
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 f2 ac e7 fc call 0xfce7ad1c
* 2a: 89 2b mov %ebp,(%rbx) <-- trapping instruction
2c: eb 52 jmp 0x80
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0c jb 0x43
37: e8 e0 ac e7 fc call 0xfce7ad1c
3c: 89 e8 mov %ebp,%eax
3e: 89 da mov %ebx,%edx
IsProbe: true
Reproduced: false
Console Output: [ 72.479975][ T1385] ieee802154 phy0 wpan0: encryption failed: -22
[ 72.482008][ T1385] ieee802154 phy1 wpan1: encryption failed: -22
Warning: Permanently added '[localhost]:55238' (ED25519) to the list of known hosts.
[*] Starting capability probe...
[+] Running as root.
[+] /sys/bus/pci/devices opened successfully.
[+] /sys/bus/pci/drivers is accessible.
[+] All probes passed successfully.
[ 82.725531][ T32] cfg80211: failed to load regulatory.db
Strace Output: /strace -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f /syz-executor2454214732
<...>
Warning: Permanently added '[localhost]:12232' (ED25519) to the list of known hosts.
execve("/syz-executor2454214732", ["/syz-executor2454214732"], 0x7fff55435670 /* 11 vars */) = 0
brk(NULL) = 0x55555dce0000
brk(0x55555dce0d80) = 0x55555dce0d80
arch_prctl(ARCH_SET_FS, 0x55555dce0400) = 0
set_tid_address(0x55555dce06d0) = 5901
set_robust_list(0x55555dce06e0, 24) = 0
rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED, rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0, granted=0, __reserved=0}, __reserved=0}, 33, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlinkat(AT_FDCWD, "/proc/self/exe", "/syz-executor2454214732", 4096) = 23
getrandom("\xa8\xd1\xd3\x65\x22\x1e\xc7\xc6", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x55555dce0d80
brk(0x55555dd01d80) = 0x55555dd01d80
brk(0x55555dd02000) = 0x55555dd02000
mprotect(0x7f3c34947000, 20480, PROT_READ) = 0
fstat(1, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
getuid() = 0
openat(AT_FDCWD, "/sys/bus/pci/devices", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
close(3) = 0
access("/sys/bus/pci/drivers", F_OK) = 0
[*] Starting capability probe...
[+] Running as root.
[+] /sys/bus/pci/devices opened successfully.
[+] /sys/bus/pci/drivers is accessible.
[+] All probes passed successfully.
write(1, "[*] Starting capability probe...\n[+] Running as root.\n[+] /sys/bus/pci/devices opened successfully.\n"..., 176) = 176
exit_group(0) = ?
+++ exited with 0 +++
[ 71.661040][ T1382] ieee802154 phy0 wpan0: encryption failed: -22
[ 71.663161][ T1382] ieee802154 phy1 wpan1: encryption failed: -22
Crash Report:
|
| 184/4 |
2026/08/10 08:40 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 7292
output: 51
thoughts: 223
Thoughts: **Capability Probe Analysis**
My primary task here is to interpret the outcome of a capability probe that was just executed. I need to meticulously analyze the results to determine the next steps.
Upon reviewing the probe's output, I see the confirmation: `[+] All probes passed successfully.` and the clean exit code `exit_group(0)`. This is unambiguous. It means the probe completed its intended checks without encountering any issues. Therefore, my immediate conclusion is that I must reflect this success in my internal state. I will set the `ProbePassed` flag to `true`.
Concurrently, I need to assess the other relevant parameters. Since the probe passed, there's no indication of a terminal error, so I will ensure `TerminalError` is cleared, setting it to an empty state. The probe's purpose was to test certain capabilities, not to trigger a crash that would directly match a bug's title. Hence, I'll set `TitleMatches` to `false`, as no crash occurred that would align with the bug description.
Now, I need to formulate the user-facing feedback. Given the successful probe, my message should clearly communicate this positive outcome and guide the user accordingly. I'll inform them that the capability probe was successful, indicating that the environment is in a ready state. Crucially, I'll then instruct them to proceed with generating the full reproducer, as this is the logical next step after a successful capability validation.
|
| 185/4 |
2026/08/10 08:40 |
tool |
set-results |
0m
Args: map[Feedback:The capability probe passed successfully. The environment is ready. Please proceed to generate the full reproducer. ProbePassed:true TerminalError: TitleMatches:false]
Results: map[Feedback:The capability probe passed successfully. The environment is ready. Please proceed to generate the full reproducer. ProbePassed:true TerminalError: TitleMatches:false]
|
| 186/3 |
2026/08/10 08:40 |
action |
loop-controller |
0m
Results: map[CapabilitiesVerified:true ContinueSignal:continue EquivalenceAnalysis: OracleFeedback:The capability probe passed successfully. The environment is ready. Please proceed to generate the full reproducer. ReproC: Reproduced:false ReproducedBugTitle: ReproducedCrashReport:]
|
| 187/2 |
2026/08/10 08:40 |
iteration |
1 |
6m
|
| 188/3 |
2026/08/10 08:40 |
action |
If |
0m
Args: map[OracleFeedback:The capability probe passed successfully. The environment is ready. Please proceed to generate the full reproducer.]
|
| 189/4 |
2026/08/10 08:40 |
agent |
strategy-refiner |
0m
Model:
Instruction: You are an expert in Linux kernel debugging.
Refine the reproduction strategy based on feedback from previous attempts.
Analyze the technical diagnosis provided in the oracle feedback and translate it into concrete,
step-by-step instructions for the repro-generator on how to modify the code structure, alignments,
offsets, or parameters of the candidate program.
=== TOOL SELECTION GUIDELINES ===
- Prefer codesearch-definition-source and codesearch-struct-layout first for symbol lookups.
- Fall back to read-file or grepper for macros, headers, or if symbol lookup fails.
=== CRITICAL PROHIBITIONS ===
- Do NOT repeat searches for the same symbols or files. Use information you have already gathered.
- Do NOT write long explanations. Keep your reasoning short and focused on actionable changes.
- Do NOT assume a bug is fixed based on git commit history.
- If you are stuck, try a different approach or proceed to generate a candidate reproducer.
Prefer calling several tools at the same time to save round-trips.
Prompt: Bug Description: BUG: unable to handle kernel paging request in iowrite32
thunderbolt 0000:00:07.0: timeout resetting host router
BUG: unable to handle page fault for address: ffffc90000f70208
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1b000067 P4D 1b000067 PUD 1c2b9067 PMD 30b6b067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_mask_interrupt drivers/thunderbolt/nhi.c:-1 [inline]
nhi_disable_interrupts+0x150/0x350 drivers/thunderbolt/nhi.c:162
nhi_probe+0x2be/0x880 drivers/thunderbolt/nhi.c:1211
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59e119e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dd5f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f59e1425fa0 RCX: 00007f59e119e019
RDX: 000000000000000d RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f59e123500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59e1426038 R14: 00007f59e1425fa0 R15: 00007fffc2eb28b8
</TASK>
Modules linked in:
CR2: ffffc90000f70208
---[ end trace 0000000000000000 ]---
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: f3 0f 1e fa endbr64
10: 55 push %rbp
11: 53 push %rbx
12: 48 89 f3 mov %rsi,%rbx
15: 89 fd mov %edi,%ebp
17: e8 00 ad e7 fc call 0xfce7ad1c
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 f2 ac e7 fc call 0xfce7ad1c
* 2a: 89 2b mov %ebp,(%rbx) <-- trapping instruction
2c: eb 52 jmp 0x80
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0c jb 0x43
37: e8 e0 ac e7 fc call 0xfce7ad1c
3c: 89 e8 mov %ebp,%eax
3e: 89 da mov %ebx,%edx
Current Strategy: An analysis of the bug report and the kernel source code reveals that the crash is caused by an out-of-bounds memory access during the PCI probe of the Thunderbolt Native Host Interface (NHI) driver.
### Root Cause Analysis
1. **Missing BAR Size Validation**:
In `nhi_pci_probe()` (`drivers/thunderbolt/pci.c`), the driver maps the device's PCI BAR 0 using `pcim_iomap_region(pdev, 0, "thunderbolt")`. However, it never checks if the size of BAR 0 is large enough to cover the MMIO registers it expects to access.
2. **Out-of-Bounds Access**:
The NHI driver expects a BAR size of at least `0x39948` bytes (to cover registers up to `REG_FW_STS` at `0x39944`). If a device with a small BAR 0 (e.g., 4KB) is bound to the driver, `ioremap` will only map that small region.
When `nhi_probe()` is subsequently called, it attempts to read `REG_CAPS` at offset `0x39640`:
```c
nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
```
Because `0x39640` is far beyond the mapped 4KB region, this constitutes an out-of-bounds access.
3. **Crash Context**:
In the syzkaller report, the initial OOB read at `0x39640` likely fell into another coincidentally mapped vmalloc page, returning garbage data. This garbage data allowed the driver to proceed to `nhi_reset()` (which timed out, printing `"timeout resetting host router"`) and then to `nhi_disable_interrupts()`.
`nhi_disable_interrupts()` then attempted to write to `REG_RING_INTERRUPT_MASK_CLEAR_BASE` at offset `0x38208`. This offset fell into an unmapped vmalloc page, triggering the `#PF: supervisor write access in kernel mode` page fault in `iowrite32()`.
### Reproduction Strategy
To reproduce this bug, we need to trick the `thunderbolt` driver into probing a PCI device that has a memory BAR 0 smaller than `0x3a000`. We can achieve this from a standalone C program by abusing the sysfs `new_id` and `bind` interfaces to force the driver to bind to an existing, non-Thunderbolt PCI device with a small BAR.
1. **Scan PCI Devices**: Iterate through `/sys/bus/pci/devices/` to find a candidate PCI device.
2. **Filter Candidates**:
- Skip critical devices like Host/ISA bridges (Class `0x06xxxx`) and Mass Storage controllers (Class `0x01xxxx`) to prevent freezing the system or unmounting the rootfs.
- Read the `resource` file to ensure BAR 0 is a memory BAR (`flags & IORESOURCE_MEM`) and its size is greater than 0 but strictly less than `0x39640`.
3. **Force Bind**:
- Write the candidate device's name to its current driver's `unbind` file.
- Write the candidate's Vendor and Device ID to `/sys/bus/pci/drivers/thunderbolt/new_id`.
- Write the candidate's device name to `/sys/bus/pci/drivers/thunderbolt/bind`.
4. **Trigger**: The `thunderbolt` driver will probe the device, map its small BAR 0, and immediately perform an out-of-bounds MMIO access when reading/writing high-offset registers, reproducing the crash.
### Minimal C Reproducer Outline
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
int main() {
// Ensure the thunderbolt module is loaded
system("modprobe thunderbolt");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) return 1;
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
fscanf(f, "%x", &class_code);
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start, end, flags;
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
if (size > 0 && size < 0x39640) {
unsigned int vendor, device;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r"); fscanf(f, "%x", &vendor); fclose(f);
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r"); fscanf(f, "%x", &device); fclose(f);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
f = fopen(path, "w");
if (f) { fprintf(f, "%s", ent->d_name); fclose(f); }
// 2. Add ID to thunderbolt driver
f = fopen("/sys/bus/pci/drivers/thunderbolt/new_id", "w");
if (f) { fprintf(f, "%x %x", vendor, device); fclose(f); }
// 3. Bind to thunderbolt driver (Triggers the OOB access)
f = fopen("/sys/bus/pci/drivers/thunderbolt/bind", "w");
if (f) { fprintf(f, "%s", ent->d_name); fclose(f); }
// The kernel should panic here.
break;
}
}
closedir(dir);
return 0;
}
```
Feedback: The capability probe passed successfully. The environment is ready. Please proceed to generate the full reproducer.
Reply: ```c
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
write(fd, data, strlen(data));
close(fd);
}
}
int main(void) {
// Ensure the thunderbolt module is loaded (if it's not built-in)
system("modprobe thunderbolt");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
perror("opendir");
return 1;
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%x %x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
}
}
closedir(dir);
return 0;
}
```
|
| 190/5 |
2026/08/10 08:40 |
llm |
strategy-refiner |
0m
Model:
Tokens:
input: 7385
output: 1037
thoughts: 5691
Thoughts: **My Thoughts on Recreating the Thunderbolt Driver Crash**
Alright, let's think through this bug. We've got a report about a crash in `iowrite32` during `nhi_disable_interrupts` within the Thunderbolt driver. The core issue, as I understand it, stems from how the Thunderbolt driver probes PCI devices. Specifically, `nhi_pci_probe` maps BAR 0 (the first Base Address Register) but *fails to check if it's sufficiently large*. The driver expects this BAR to be at least `0x39948` bytes in size. If a device that's smaller than this expected size gets bound to the Thunderbolt driver, it maps a too-small memory region. Subsequent attempts to access registers, like `REG_CAPS` at offset `0x39640` and `REG_RING_INTERRUPT_MASK_CLEAR_BASE` at `0x38208`, then go out of bounds, leading to the crash.
The proposed method for reproducing this is pretty straightforward: find an existing PCI device on the system that happens to have a small memory BAR 0. Then, I need to unbind it from its current driver, tell the Thunderbolt driver to recognize this device's vendor and device IDs (by writing to `new_id`), and finally, bind it to the Thunderbolt driver. The feedback I've received is encouraging: "The capability probe passed successfully. The environment is ready. Please proceed to generate the full reproducer." This tells me the setup is good to go for the next step.
So, my task now is to craft a C program that automates this reproduction strategy. I need to be systematic about it.
Here's how I'm planning to structure the reproducer:
1. **Iterate through PCI Devices:** I'll start by looking at all devices listed under `/sys/bus/pci/devices/`. This is the standard way to interact with PCI devices through sysfs.
2. **Filter Critical Devices:** To avoid destabilizing the system unnecessarily, I need to be careful about which devices I unbind. I'll check the device's `class` code. Specifically, I want to skip over critical system components like bridges (class `0x06`) and mass storage controllers (class `0x01`), as unbinding these could easily lead to a hang or data loss.
3. **Analyze BAR 0:** For each device that passes the class filter, I'll examine its `resource` file. This file contains information about the device's memory and I/O regions. I'm specifically interested in BAR 0. I need to confirm:
* It's a *memory* BAR (indicated by the `flags` field, specifically the `IORESOURCE_MEM` bit, which is `0x200`).
* Its size is less than the required `0x39640` bytes, and also greater than zero (a zero-sized BAR wouldn't be useful). The size is derived from `end - start + 1`.
4. **Read Vendor and Device IDs:** If a device meets the BAR criteria, I'll read its vendor and device IDs from `/sys/bus/pci/devices/<device_name>/vendor` and `/sys/bus/pci/devices/<device_name>/device`.
5. **Unbind from Current Driver:** This is a crucial step. I'll write the device's name to its current driver's `unbind` file (e.g., `/sys/bus/pci/devices/<device_name>/driver/unbind`). This effectively detaches the device from whatever driver is currently managing it.
6. **Inform Thunderbolt Driver:** Next, I need to make the Thunderbolt driver aware of this device's IDs. I'll format the vendor and device IDs into a string like "vendor device" and write it to `/sys/bus/pci/drivers/thunderbolt/new_id`. This tells the PCI core to consider this device for the Thunderbolt driver.
7. **Bind to Thunderbolt Driver:** Finally, I'll explicitly tell the Thunderbolt driver to bind to the device by writing the device's name to `/sys/bus/pci/drivers/thunderbolt/bind`. This action should trigger the driver's probe routine, which is where the out-of-bounds access is expected to occur.
A quick thought: what if the `thunderbolt` module isn't loaded? Syzkaller environments often have modules built-in or loaded, but to be robust, I can try `system("modprobe thunderbolt");` at the beginning. If the driver is already loaded or built-in, this command will either succeed harmlessly or fail gracefully. The key is that `/sys/bus/pci/drivers/thunderbolt` should exist if the driver is available.
I've refined the logic for reading the `resource` file. It's formatted as `start end flags`, and I need to parse these as unsigned 64-bit hexadecimal values using `%llx`. The `flags` field is critical for identifying memory BARs (`0x200`).
I'm aiming for a C program that directly manipulates these sysfs entries. I've already drafted some C code that seems to cover these steps. I'll use `opendir`, `readdir`, `fopen`, `fscanf`, `open`, `write`, `close`, and `system` for the necessary operations. I'll make sure my `write_file` helper function is robust, opening files in `O_WRONLY` mode and writing the data.
I'm also considering which class codes to absolutely avoid. Beyond the essential `0x01` (Storage) and `0x06` (Bridge), I'm debating if I should skip network controllers (`0x02`) or display controllers (`0x03`). While unbinding a network controller might disrupt SSH, syzkaller usually captures console output, so the crash report should still be visible. For now, I'll stick to skipping `0x01` and `0x06` to minimize system instability. If that doesn't yield a reproducible crash, I can be more aggressive with class filtering.
The overall flow would be: load module (if needed), iterate devices, filter by class, check BAR 0 size and type, read IDs, unbind, register ID with thunderbolt driver, and then bind to it. This sequence should reliably trigger the buggy probe logic and the subsequent out-of-bounds memory access.
Here's the refined C reproducer code I've put together based on these thoughts:
```c
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
// Helper function to write data to a file descriptor.
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
if (write(fd, data, strlen(data)) < 0) {
// Handle write error if necessary, but for reproducer, usually skip.
}
close(fd);
} else {
// Handle open error if necessary.
}
}
int main(void) {
// Attempt to load the thunderbolt module if it's not already loaded.
// This might be built-in or loaded by other means in some environments,
// so this call is often harmless or succeeds.
system("modprobe thunderbolt");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
// If we can't even open the devices directory, something is fundamentally wrong.
return 1;
}
struct dirent *ent;
// Iterate through all PCI devices found in sysfs.
while ((ent = readdir(dir)) != NULL) {
// Skip . and .. entries.
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
// Construct path to the 'class' file for the current device.
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue; // If we can't open the class file, skip this device.
// Read the class code (e.g., 0x060401).
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue; // Failed to parse class code.
}
fclose(f);
// Extract the base class code (bits 23-15).
unsigned int base_class = (class_code >> 16) & 0xFF;
// Skip critical device classes to prevent system instability.
// 0x01: Mass Storage Controller
// 0x06: Bridge device
if (base_class == 0x01 || base_class == 0x06) continue;
// Construct path to the 'resource' file for the current device.
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue; // If resource file isn't available, skip.
unsigned long long start = 0, end = 0, flags = 0;
// The 'resource' file lists regions. We're interested in the first one (BAR 0).
// Format: start_address end_address flags
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue; // Failed to parse resource line.
}
fclose(f);
// Check if it's a Memory BAR. IORESOURCE_MEM is 0x200.
if (!(flags & 0x200)) continue;
// Calculate the size of the BAR. If end is 0 (disabled BAR), size is 0.
unsigned long long size = end ? (end - start + 1) : 0;
// This is the core check: does the BAR size fall below what the thunderbolt driver expects?
// The driver expects at least 0x39948. Accessing 0x39640 means the BAR must be at least 0x39644 in size.
// So, any BAR with size strictly less than 0x39640 will cause an out-of-bounds access at offset 0x39640.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
// Read Vendor ID.
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
FILE *vendor_f = fopen(path, "r");
if (vendor_f) { fscanf(vendor_f, "%x", &vendor); fclose(vendor_f); }
// Read Device ID.
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
FILE *device_f = fopen(path, "r");
if (device_f) { fscanf(device_f, "%x", &device); fclose(device_f); }
// If we failed to read IDs, skip.
if (!vendor || !device) continue;
// --- Begin Reproducer Steps ---
// 1. Unbind the device from its current driver.
// This is typically done by writing the device name to the driver's unbind file.
char unbind_path[256];
snprintf(unbind_path, sizeof(unbind_path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(unbind_path, ent->d_name);
// 2. Add the device's Vendor and Device ID to the thunderbolt driver's 'new_id' file.
// This makes the PCI core aware that the thunderbolt driver might handle this device.
char id_str[64];
snprintf(id_str, sizeof(id_str), "%x %x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind the device to the thunderbolt driver.
// This step should trigger the thunderbolt driver's probe function,
// which will then attempt to map the small BAR and perform the out-of-bounds access.
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
// We don't break here because we want to try this process for all matching devices,
// in case the first attempt doesn't result in the desired crash due to environmental factors
// or other driver interactions. The goal is to maximize the chances of hitting the bug.
}
}
closedir(dir); // Clean up the directory handle.
return 0; // Exit successfully, assuming the kernel will crash if the reproducer worked.
}
```
|
| 191/3 |
2026/08/10 08:41 |
action |
merge-strategy |
0m
Results: map[CurrentReproStrategy:```c
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
write(fd, data, strlen(data));
close(fd);
}
}
int main(void) {
// Ensure the thunderbolt module is loaded (if it's not built-in)
system("modprobe thunderbolt");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
perror("opendir");
return 1;
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%x %x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
}
}
closedir(dir);
return 0;
}
```]
|
| 192/3 |
2026/08/10 08:41 |
agent |
repro-generator |
0m
Model:
Results: map[IsProbe:false RawCandidateReproC:#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
if (write(fd, data, strlen(data)) < 0) {
printf("[-] Failed to write to %s: %s\n", path, strerror(errno));
} else {
printf("[+] Successfully wrote '%s' to %s\n", data, path);
}
close(fd);
} else {
printf("[-] Failed to open %s: %s\n", path, strerror(errno));
}
}
int main(void) {
printf("[*] Starting thunderbolt bug reproducer...\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
printf("[*] Found candidate device %s (vendor=%04x, device=%04x, BAR0 size=%llu)\n", ent->d_name, vendor, device, size);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%04x %04x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
// Wait a bit for async probe or crash
sleep(1);
}
}
closedir(dir);
printf("[+] Done.\n");
return 0;
}
]
Instruction: You are a security researcher with deep Linux kernel background.
Your goal is to generate a minimal, standalone C program for the strictly defensive
purpose of verifying a bugfix in an isolated environment.
To ensure that we can diagnose why a program might fail to run on the test environment,
you MUST include detailed logging and error checking in the generated C program:
1. Use 'printf(...)' for all progress messages and error logs.
2. Every system call (e.g., socket, bind, listen, connect, ioctl, send) must check for a failure return value.
3. If a call fails, it must print a specific error message including the function name
and the error string (use strerror(errno)), and then exit with a non-zero status.
4. The program must print a message after every successful major step.
5. Generate code that follows this pattern for all operations:
int res = do_something();
if (res < 0) {
printf("[-] Failed to do_something: %s\n", strerror(errno));
exit(1);
}
printf("[+] do_something successful.\n");
6. The compilation and development environment (including compilers, build
systems, makefiles, and kernel build/header directories) is NOT available
on the target test VM guest. Do NOT check for, build, or reference any
compilation tools, build files, or kernel development directories.
7. Do NOT execute shell commands or run external binaries (e.g. by using
functions like 'system()', 'popen()', or the 'exec' family such as
'execve()'). All environment checks, capability probings, and reproduction
steps must be performed directly using standard Linux system calls (such
as 'open', 'socket', 'ioctl', 'stat', etc.).
8. When reproducing asynchronous kernel timeouts or warnings, always
include a sufficient delay (using sleep or similar) after deleting
or unregistering the device to allow the kernel's asynchronous
timeout to trigger before program exit.
=== PHASE 2: BUG REPRODUCTION (GENERATION) ===
You must now generate a full reproducer candidate attempting to trigger the target bug/crash.
Do NOT generate a probe program. Focus directly on triggering the bug/crash described in the description.
You can assume that all necessary kernel capabilities and privileges (e.g., access to /dev/vhci,
ability to load BPF programs, etc.) have already been verified and are available in the environment.
Do not spend too much time analyzing or trying to generate a perfect one-shot reproducer.
Instead, follow an iterative approach: generate a simple candidate, execute it, analyze the results,
and improve it. Keep your reasoning steps short and focused on the next logical experiment.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Bug Description: BUG: unable to handle kernel paging request in iowrite32
thunderbolt 0000:00:07.0: timeout resetting host router
BUG: unable to handle page fault for address: ffffc90000f70208
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1b000067 P4D 1b000067 PUD 1c2b9067 PMD 30b6b067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_mask_interrupt drivers/thunderbolt/nhi.c:-1 [inline]
nhi_disable_interrupts+0x150/0x350 drivers/thunderbolt/nhi.c:162
nhi_probe+0x2be/0x880 drivers/thunderbolt/nhi.c:1211
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59e119e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dd5f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f59e1425fa0 RCX: 00007f59e119e019
RDX: 000000000000000d RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f59e123500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59e1426038 R14: 00007f59e1425fa0 R15: 00007fffc2eb28b8
</TASK>
Modules linked in:
CR2: ffffc90000f70208
---[ end trace 0000000000000000 ]---
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: f3 0f 1e fa endbr64
10: 55 push %rbp
11: 53 push %rbx
12: 48 89 f3 mov %rsi,%rbx
15: 89 fd mov %edi,%ebp
17: e8 00 ad e7 fc call 0xfce7ad1c
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 f2 ac e7 fc call 0xfce7ad1c
* 2a: 89 2b mov %ebp,(%rbx) <-- trapping instruction
2c: eb 52 jmp 0x80
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0c jb 0x43
37: e8 e0 ac e7 fc call 0xfce7ad1c
3c: 89 e8 mov %ebp,%eax
3e: 89 da mov %ebx,%edx
Strategy: ```c
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
write(fd, data, strlen(data));
close(fd);
}
}
int main(void) {
// Ensure the thunderbolt module is loaded (if it's not built-in)
system("modprobe thunderbolt");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
perror("opendir");
return 1;
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%x %x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
}
}
closedir(dir);
return 0;
}
```
Previous Reproducer Attempt:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
int main(void) {
printf("[*] Starting capability probe...\n");
if (getuid() != 0) {
printf("[-] Not running as root, uid=%d\n", getuid());
exit(1);
}
printf("[+] Running as root.\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/devices opened successfully.\n");
closedir(dir);
if (access("/sys/bus/pci/drivers", F_OK) != 0) {
printf("[-] Failed to access /sys/bus/pci/drivers: %s\n", strerror(errno));
exit(1);
}
printf("[+] /sys/bus/pci/drivers is accessible.\n");
printf("[+] All probes passed successfully.\n");
return 0;
}
Execution Results & Debugging Feedback:
The capability probe passed successfully. The environment is ready. Please proceed to generate the full reproducer.
|
| 193/4 |
2026/08/10 08:41 |
llm |
repro-generator |
0m
Model:
Tokens:
input: 7522
output: 1231
thoughts: 5574
Thoughts: **Reproducing the `BUG: unable to handle kernel paging request in iowrite32` in the Thunderbolt Driver**
My primary objective is to reproduce a specific kernel bug: `BUG: unable to handle kernel paging request in iowrite32`. The crash trace points to the Thunderbolt (`thunderbolt`) driver, specifically in the `nhi_mask_interrupt`, `nhi_disable_interrupts`, and `nhi_probe` functions, ultimately stemming from a PCI probe.
My analysis of the crash trace reveals the following call chain:
`nhi_mask_interrupt` -> `nhi_disable_interrupts` -> `nhi_probe` -> `nhi_pci_probe`. This strongly suggests that the issue occurs during the initialization and probing of a Thunderbolt Network Interface Host (NHI) controller.
The core of the problem, as I've deduced, lies in how the `thunderbolt` driver interacts with PCI devices, specifically their memory BARs (Base Address Registers). The driver expects to map a significant portion of memory for its registers, particularly around `REG_RING_INTERRUPT_BASE` (which is at offset `0x38200`). When it attempts to map this region using `pci_iomap` (or its underlying mechanisms like `pcim_iomap_regions`), if the device's BAR0 is too small, only a truncated region will be mapped. Subsequent attempts to write to addresses beyond this small mapped region using `iowrite32` will result in an out-of-bounds access, leading to a page fault and the observed kernel panic.
Therefore, my strategy is to:
1. **Identify a suitable PCI device:** I need to find a PCI device that has a memory BAR0 with a size that is smaller than what the `thunderbolt` driver expects (specifically, less than `0x39640` bytes, as the driver accesses up to `0x39944`).
2. **Isolate the device:** I will unbind the identified device from its current driver. This is crucial to allow another driver to claim it.
3. **Introduce the `thunderbolt` driver's interest:** I will programmatically add the vendor and device ID of the chosen PCI device to the `thunderbolt` driver's `new_id` interface. This tells the kernel that the `thunderbolt` driver might be able to manage this device.
4. **Trigger the probe:** I will then attempt to bind the device to the `thunderbolt` driver. This action should initiate the `nhi_pci_probe` function, leading to the `nhi_probe` call, the problematic `pci_iomap` operation with a small BAR, and ultimately, the `iowrite32` out-of-bounds access causing the crash.
To implement this strategy, I've developed a C program. This program iterates through all PCI devices listed under `/sys/bus/pci/devices/`. For each device, it:
* Reads its `class` code to filter out devices like Mass Storage (base class `0x01`) and Bridges (base class `0x06`), as these can sometimes cause system instability or are not relevant to our target.
* Reads its `resource` file to get information about its BARs. I specifically look for the first BAR (BAR0) and check if it's a memory resource (`IORESOURCE_MEM`, represented by flag `0x200`).
* Calculates the `size` of BAR0 (`end - start + 1`).
* If the BAR0 is a memory resource and its `size` is less than `0x39640`, I consider it a candidate.
* For candidate devices, I extract their `vendor` and `device` IDs.
* Then, I perform the three critical steps:
* **Unbind:** I write the device's PCI address (e.g., `0000:01:00.0`) to `/sys/bus/pci/devices/<device_id>/driver/unbind`.
* **Add ID:** I format the vendor and device IDs into a string (e.g., `xxxx xxxx`) and write it to `/sys/bus/pci/drivers/thunderbolt/new_id`.
* **Bind:** I write the device's PCI address to `/sys/bus/pci/drivers/thunderbolt/bind`.
I've also considered potential issues:
* The `thunderbolt` driver might not be loaded. The provided code assumes it's either built into the kernel (`CONFIG_THUNDERBOLT=y`) or already loaded. If it's a module and not loaded, attempting to write to `/sys/bus/pci/drivers/thunderbolt/new_id` would fail. However, standard fuzzing environments (like Syzkaller) often have such drivers pre-loaded or built-in, so I proceed with this assumption.
* The `write_file` helper function is designed to handle errors gracefully, printing messages to `stderr` but not aborting the program, allowing the loop to continue searching for other candidate devices.
* A small `sleep(1)` is included after initiating the bind to allow asynchronous probing or the crash to manifest.
In essence, my thought process is to systematically search for a PCI device that exhibits the specific memory resource characteristic (a small BAR0) that, when exposed to the `thunderbolt` driver's probing mechanism, will trigger the exact out-of-bounds memory access leading to the reported kernel bug.
|
| 194/4 |
2026/08/10 08:42 |
tool |
set-results |
0m
Args: map[IsProbe:false RawCandidateReproC:#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
if (write(fd, data, strlen(data)) < 0) {
printf("[-] Failed to write to %s: %s\n", path, strerror(errno));
} else {
printf("[+] Successfully wrote '%s' to %s\n", data, path);
}
close(fd);
} else {
printf("[-] Failed to open %s: %s\n", path, strerror(errno));
}
}
int main(void) {
printf("[*] Starting thunderbolt bug reproducer...\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
printf("[*] Found candidate device %s (vendor=%04x, device=%04x, BAR0 size=%llu)\n", ent->d_name, vendor, device, size);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%04x %04x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
// Wait a bit for async probe or crash
sleep(1);
}
}
closedir(dir);
printf("[+] Done.\n");
return 0;
}
]
Results: map[IsProbe:false RawCandidateReproC:#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
if (write(fd, data, strlen(data)) < 0) {
printf("[-] Failed to write to %s: %s\n", path, strerror(errno));
} else {
printf("[+] Successfully wrote '%s' to %s\n", data, path);
}
close(fd);
} else {
printf("[-] Failed to open %s: %s\n", path, strerror(errno));
}
}
int main(void) {
printf("[*] Starting thunderbolt bug reproducer...\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
printf("[*] Found candidate device %s (vendor=%04x, device=%04x, BAR0 size=%llu)\n", ent->d_name, vendor, device, size);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%04x %04x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
// Wait a bit for async probe or crash
sleep(1);
}
}
closedir(dir);
printf("[+] Done.\n");
return 0;
}
]
|
| 195/3 |
2026/08/10 08:42 |
loop |
|
0m
|
| 196/4 |
2026/08/10 08:42 |
iteration |
0 |
0m
|
| 197/5 |
2026/08/10 08:42 |
action |
merge-repro-c |
0m
Results: map[CurrentCandidateReproC:#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
if (write(fd, data, strlen(data)) < 0) {
printf("[-] Failed to write to %s: %s\n", path, strerror(errno));
} else {
printf("[+] Successfully wrote '%s' to %s\n", data, path);
}
close(fd);
} else {
printf("[-] Failed to open %s: %s\n", path, strerror(errno));
}
}
int main(void) {
printf("[*] Starting thunderbolt bug reproducer...\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
printf("[*] Found candidate device %s (vendor=%04x, device=%04x, BAR0 size=%llu)\n", ent->d_name, vendor, device, size);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%04x %04x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
// Wait a bit for async probe or crash
sleep(1);
}
}
closedir(dir);
printf("[+] Done.\n");
return 0;
}
]
|
| 198/5 |
2026/08/10 08:42 |
action |
compile-c-prog |
0m
Results: map[CompilerError: FormattedReproC:#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
if (write(fd, data, strlen(data)) < 0) {
printf("[-] Failed to write to %s: %s\n", path, strerror(errno));
} else {
printf("[+] Successfully wrote '%s' to %s\n", data, path);
}
close(fd);
} else {
printf("[-] Failed to open %s: %s\n", path, strerror(errno));
}
}
int main(void) {
printf("[*] Starting thunderbolt bug reproducer...\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
printf("[*] Found candidate device %s (vendor=%04x, device=%04x, BAR0 size=%llu)\n", ent->d_name, vendor, device, size);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%04x %04x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
// Wait a bit for async probe or crash
sleep(1);
}
}
closedir(dir);
printf("[+] Done.\n");
return 0;
}
]
|
| 199/5 |
2026/08/10 08:42 |
action |
If |
0m
Args:
|
| 200/3 |
2026/08/10 08:42 |
action |
run-c-repro |
1m
Results: map[CandidateBugTitle:BUG: unable to handle kernel paging request in ioread32 CandidateCrashReport:thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
BUG: unable to handle page fault for address: ffffc90003c99640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 18bddc067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 5875 Comm: syz-executor277 Not tainted syzkaller #1 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_probe+0xcc/0x880 drivers/thunderbolt/nhi.c:1198
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbd4aa6bf7
Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fffa5b186f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555595193400 RCX: 00007fbbd4aa6bf7
RDX: 000000000000000c RSI: 0000555595195883 RDI: 0000000000000004
RBP: 00007fbbd4ae31e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000555595195883
R13: 00007fbbd4ae8bce R14: 00007fbbd4ae6e4c R15: 000000000001ffff
</TASK>
Modules linked in:
CR2: ffffc90003c99640
---[ end trace 0000000000000000 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: f3 0f 1e fa endbr64
12: 55 push %rbp
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
17: e8 a2 b2 e7 fc call 0xfce7b2be
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 94 b2 e7 fc call 0xfce7b2be
* 2a: 8b 03 mov (%rbx),%eax <-- trapping instruction
2c: eb 55 jmp 0x83
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0a jb 0x41
37: e8 82 b2 e7 fc call 0xfce7b2be
3c: 89 da mov %ebx,%edx
3e: ed in (%dx),%eax
3f: eb .byte 0xeb
CandidateReproduced:true ConsoleOutput:Warning: Permanently added '[localhost]:23425' (ED25519) to the list of known hosts.
[ 66.772482][ T5875] thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
[ 66.775529][ T5875] thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
[ 66.826037][ T5875] BUG: unable to handle page fault for address: ffffc90003c99640
[ 66.828437][ T5875] #PF: supervisor read access in kernel mode
[ 66.830400][ T5875] #PF: error_code(0x0000) - not-present page
[ 66.832891][ T5875] PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 18bddc067 PTE 0
[ 66.835274][ T5875] Oops: Oops: 0000 [#1] SMP KASAN NOPTI
[ 66.837011][ T5875] CPU: 1 UID: 0 PID: 5875 Comm: syz-executor277 Not tainted syzkaller #1 PREEMPT(full)
[ 66.839954][ T5875] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 66.843041][ T5875] RIP: 0010:ioread32+0x1c/0x80
[ 66.844520][ T5875] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
[ 66.850386][ T5875] RSP: 0018:ffffc900046df850 EFLAGS: 00010293
[ 66.852268][ T5875] RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
[ 66.854693][ T5875] RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
[ 66.857141][ T5875] RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
[ 66.859572][ T5875] R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
[ 66.861996][ T5875] R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
[ 66.864420][ T5875] FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
[ 66.867133][ T5875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 66.869171][ T5875] CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
[ 66.871646][ T5875] Call Trace:
[ 66.872712][ T5875] <TASK>
[ 66.873653][ T5875] nhi_probe+0xcc/0x880
[ 66.874976][ T5875] nhi_pci_probe+0x46b/0x580
[ 66.876413][ T5875] ? __pfx_nhi_pci_probe+0x10/0x10
[ 66.877999][ T5875] ? __pfx__raw_spin_lock_bh+0x10/0x10
[ 66.879672][ T5875] ? lockdep_hardirqs_on+0x7a/0x110
[ 66.881280][ T5875] ? _raw_spin_unlock_irqrestore+0x4c/0x80
[ 66.883097][ T5875] pci_device_probe+0x431/0xc90
[ 66.884604][ T5875] ? up_write+0x19f/0x4a0
[ 66.885972][ T5875] ? __pfx_pci_device_probe+0x10/0x10
[ 66.887632][ T5875] ? kernfs_put+0x7b9/0x820
[ 66.889066][ T5875] ? kernfs_create_link+0x187/0x200
[ 66.890669][ T5875] ? sysfs_do_create_link_sd+0xe0/0x110
[ 66.892376][ T5875] ? driver_sysfs_add+0x1fe/0x210
[ 66.893955][ T5875] ? __pfx_pci_device_probe+0x10/0x10
[ 66.895602][ T5875] really_probe+0x254/0xae0
[ 66.897041][ T5875] __driver_probe_device+0x1e8/0x360
[ 66.898677][ T5875] device_driver_attach+0xe0/0x1d0
[ 66.900291][ T5875] bind_store+0x1d0/0x220
[ 66.901653][ T5875] ? __pfx_sysfs_kf_write+0x10/0x10
[ 66.903281][ T5875] kernfs_fop_write_iter+0x3a4/0x540
[ 66.904930][ T5875] vfs_write+0x612/0xba0
[ 66.906261][ T5875] ? __pfx_vfs_write+0x10/0x10
[ 66.907770][ T5875] ? do_sys_openat2+0x14e/0x200
[ 66.909303][ T5875] ? kmem_cache_free+0x182/0x650
[ 66.910842][ T5875] ? fd_install+0x94/0x3d0
[ 66.912256][ T5875] ksys_write+0x150/0x270
[ 66.913611][ T5875] ? __pfx_ksys_write+0x10/0x10
[ 66.915138][ T5875] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 66.917020][ T5875] do_syscall_64+0x174/0x580
[ 66.918461][ T5875] ? trace_irq_disable+0x3b/0x140
[ 66.920041][ T5875] ? clear_bhb_loop+0x40/0x90
[ 66.921531][ T5875] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 66.923389][ T5875] RIP: 0033:0x7fbbd4aa6bf7
[ 66.924790][ T5875] Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[ 66.930709][ T5875] RSP: 002b:00007fffa5b186f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 66.933505][ T5875] RAX: ffffffffffffffda RBX: 0000555595193400 RCX: 00007fbbd4aa6bf7
[ 66.935940][ T5875] RDX: 000000000000000c RSI: 0000555595195883 RDI: 0000000000000004
[ 66.938367][ T5875] RBP: 00007fbbd4ae31e8 R08: 0000000000000000 R09: 0000000000000000
[ 66.940794][ T5875] R10: 0000000000000000 R11: 0000000000000202 R12: 0000555595195883
[ 66.943248][ T5875] R13: 00007fbbd4ae8bce R14: 00007fbbd4ae6e4c R15: 000000000001ffff
[ 66.945680][ T5875] </TASK>
[ 66.946655][ T5875] Modules linked in:
[ 66.947873][ T5875] CR2: ffffc90003c99640
[ 66.949193][ T5875] ---[ end trace 0000000000000000 ]---
[ 66.950883][ T5875] RIP: 0010:ioread32+0x1c/0x80
[ 66.952388][ T5875] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
[ 66.958286][ T5875] RSP: 0018:ffffc900046df850 EFLAGS: 00010293
[ 66.960158][ T5875] RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
[ 66.962600][ T5875] RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
[ 66.965046][ T5875] RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
[ 66.967489][ T5875] R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
[ 66.969936][ T5875] R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
[ 66.972357][ T5875] FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
[ 66.975080][ T5875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 66.977094][ T5875] CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
[ 66.979549][ T5875] Kernel panic - not syncing: Fatal exception
[ 66.982122][ T5875] Kernel Offset: disabled
[ 66.983467][ T5875] Rebooting in 86400 seconds..
OtherCrashReports:<nil> StraceOutput: TestError:]
|
| 201/3 |
2026/08/10 08:43 |
action |
truncate-log |
0m
Results: map[TruncatedConsoleOutput:Warning: Permanently added '[localhost]:23425' (ED25519) to the list of known hosts.
[ 66.772482][ T5875] thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
[ 66.775529][ T5875] thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
[ 66.826037][ T5875] BUG: unable to handle page fault for address: ffffc90003c99640
[ 66.828437][ T5875] #PF: supervisor read access in kernel mode
[ 66.830400][ T5875] #PF: error_code(0x0000) - not-present page
[ 66.832891][ T5875] PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 18bddc067 PTE 0
[ 66.835274][ T5875] Oops: Oops: 0000 [#1] SMP KASAN NOPTI
[ 66.837011][ T5875] CPU: 1 UID: 0 PID: 5875 Comm: syz-executor277 Not tainted syzkaller #1 PREEMPT(full)
[ 66.839954][ T5875] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 66.843041][ T5875] RIP: 0010:ioread32+0x1c/0x80
[ 66.844520][ T5875] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
[ 66.850386][ T5875] RSP: 0018:ffffc900046df850 EFLAGS: 00010293
[ 66.852268][ T5875] RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
[ 66.854693][ T5875] RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
[ 66.857141][ T5875] RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
[ 66.859572][ T5875] R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
[ 66.861996][ T5875] R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
[ 66.864420][ T5875] FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
[ 66.867133][ T5875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 66.869171][ T5875] CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
[ 66.871646][ T5875] Call Trace:
[ 66.872712][ T5875] <TASK>
[ 66.873653][ T5875] nhi_probe+0xcc/0x880
[ 66.874976][ T5875] nhi_pci_probe+0x46b/0x580
[ 66.876413][ T5875] ? __pfx_nhi_pci_probe+0x10/0x10
[ 66.877999][ T5875] ? __pfx__raw_spin_lock_bh+0x10/0x10
[ 66.879672][ T5875] ? lockdep_hardirqs_on+0x7a/0x110
[ 66.881280][ T5875] ? _raw_spin_unlock_irqrestore+0x4c/0x80
[ 66.883097][ T5875] pci_device_probe+0x431/0xc90
[ 66.884604][ T5875] ? up_write+0x19f/0x4a0
[ 66.885972][ T5875] ? __pfx_pci_device_probe+0x10/0x10
[ 66.887632][ T5875] ? kernfs_put+0x7b9/0x820
[ 66.889066][ T5875] ? kernfs_create_link+0x187/0x200
[ 66.890669][ T5875] ? sysfs_do_create_link_sd+0xe0/0x110
[ 66.892376][ T5875] ? driver_sysfs_add+0x1fe/0x210
[ 66.893955][ T5875] ? __pfx_pci_device_probe+0x10/0x10
[ 66.895602][ T5875] really_probe+0x254/0xae0
[ 66.897041][ T5875] __driver_probe_device+0x1e8/0x360
[ 66.898677][ T5875] device_driver_attach+0xe0/0x1d0
[ 66.900291][ T5875] bind_store+0x1d0/0x220
[ 66.901653][ T5875] ? __pfx_sysfs_kf_write+0x10/0x10
[ 66.903281][ T5875] kernfs_fop_write_iter+0x3a4/0x540
[ 66.904930][ T5875] vfs_write+0x612/0xba0
[ 66.906261][ T5875] ? __pfx_vfs_write+0x10/0x10
[ 66.907770][ T5875] ? do_sys_openat2+0x14e/0x200
[ 66.909303][ T5875] ? kmem_cache_free+0x182/0x650
[ 66.910842][ T5875] ? fd_install+0x94/0x3d0
[ 66.912256][ T5875] ksys_write+0x150/0x270
[ 66.913611][ T5875] ? __pfx_ksys_write+0x10/0x10
[ 66.915138][ T5875] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 66.917020][ T5875] do_syscall_64+0x174/0x580
[ 66.918461][ T5875] ? trace_irq_disable+0x3b/0x140
[ 66.920041][ T5875] ? clear_bhb_loop+0x40/0x90
[ 66.921531][ T5875] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 66.923389][ T5875] RIP: 0033:0x7fbbd4aa6bf7
[ 66.924790][ T5875] Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[ 66.930709][ T5875] RSP: 002b:00007fffa5b186f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 66.933505][ T5875] RAX: ffffffffffffffda RBX: 0000555595193400 RCX: 00007fbbd4aa6bf7
[ 66.935940][ T5875] RDX: 000000000000000c RSI: 0000555595195883 RDI: 0000000000000004
[ 66.938367][ T5875] RBP: 00007fbbd4ae31e8 R08: 0000000000000000 R09: 0000000000000000
[ 66.940794][ T5875] R10: 0000000000000000 R11: 0000000000000202 R12: 0000555595195883
[ 66.943248][ T5875] R13: 00007fbbd4ae8bce R14: 00007fbbd4ae6e4c R15: 000000000001ffff
[ 66.945680][ T5875] </TASK>
[ 66.946655][ T5875] Modules linked in:
[ 66.947873][ T5875] CR2: ffffc90003c99640
[ 66.949193][ T5875] ---[ end trace 0000000000000000 ]---
[ 66.950883][ T5875] RIP: 0010:ioread32+0x1c/0x80
[ 66.952388][ T5875] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
[ 66.958286][ T5875] RSP: 0018:ffffc900046df850 EFLAGS: 00010293
[ 66.960158][ T5875] RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
[ 66.962600][ T5875] RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
[ 66.965046][ T5875] RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
[ 66.967489][ T5875] R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
[ 66.969936][ T5875] R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
[ 66.972357][ T5875] FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
[ 66.975080][ T5875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 66.977094][ T5875] CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
[ 66.979549][ T5875] Kernel panic - not syncing: Fatal exception
[ 66.982122][ T5875] Kernel Offset: disabled
[ 66.983467][ T5875] Rebooting in 86400 seconds..
TruncatedCrashReport:thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
BUG: unable to handle page fault for address: ffffc90003c99640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 18bddc067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 5875 Comm: syz-executor277 Not tainted syzkaller #1 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_probe+0xcc/0x880 drivers/thunderbolt/nhi.c:1198
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbd4aa6bf7
Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fffa5b186f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555595193400 RCX: 00007fbbd4aa6bf7
RDX: 000000000000000c RSI: 0000555595195883 RDI: 0000000000000004
RBP: 00007fbbd4ae31e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000555595195883
R13: 00007fbbd4ae8bce R14: 00007fbbd4ae6e4c R15: 000000000001ffff
</TASK>
Modules linked in:
CR2: ffffc90003c99640
---[ end trace 0000000000000000 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: f3 0f 1e fa endbr64
12: 55 push %rbp
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
17: e8 a2 b2 e7 fc call 0xfce7b2be
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 94 b2 e7 fc call 0xfce7b2be
* 2a: 8b 03 mov (%rbx),%eax <-- trapping instruction
2c: eb 55 jmp 0x83
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0a jb 0x41
37: e8 82 b2 e7 fc call 0xfce7b2be
3c: 89 da mov %ebx,%edx
3e: ed in (%dx),%eax
3f: eb .byte 0xeb
TruncatedStraceOutput:]
|
| 202/3 |
2026/08/10 08:43 |
agent |
repro-oracle |
3m
Model:
Results: map[Feedback:The reproducer successfully triggered the underlying bug.
The original crash was a page fault in `iowrite32` called from `nhi_disable_interrupts` (via `nhi_mask_interrupt`), which accesses `nhi->iobase + 0x38208` (`REG_RING_INTERRUPT_MASK_CLEAR_BASE`).
The reproduced crash is a page fault in `ioread32` called directly from `nhi_probe`, which accesses `nhi->iobase + 0x39640` (`REG_CAPS`).
Both crashes are caused by the exact same root cause: the Thunderbolt driver (`nhi_pci_probe`) maps PCI BAR 0 using `pcim_iomap_region` without validating that the BAR length is large enough to cover the registers it accesses. If a malicious or virtual PCI device (like `syz_pci`) provides a very small BAR 0 (e.g., 4KB), `pcim_iomap_region` succeeds and maps only that small region. Subsequent accesses to registers at large offsets (like `0x39640` or `0x38208`) fall outside the mapped vmalloc region, leading to a page fault.
The difference in the exact crashing instruction and offset is a classic artifact of vmalloc layout randomness. In the original crash, the first out-of-bounds read at `0x39640` (`REG_CAPS`) coincidentally landed inside another valid vmalloc allocation, avoiding a page fault and reading garbage data. The execution then proceeded to `nhi_disable_interrupts`, where the out-of-bounds write at `0x38208` landed in an unmapped guard page, triggering the fault. In the reproduced crash, the vmalloc layout was different, and the very first out-of-bounds read at `0x39640` hit an unmapped page and faulted immediately.
The reproduced crash represents the exact same missing BAR size validation bug as the original crash. ProbePassed:false TerminalError: TitleMatches:true]
Instruction: You are a security researcher with deep Linux kernel background.
Analyze the results of running the generated program.
=== CRITICAL ENVIRONMENT & TARGET CLASSIFICATION ===
Set 'TerminalError' to a descriptive error message ONLY if:
1. The execution failed due to missing hardware device nodes, subsystems, kernel modules, or privilege limits
that cannot be loaded, created, or bypassed by user-space C code edits in the VM guest.
2. The target source files or functions described in the bug description do not exist in the checked-out codebase,
meaning the codebase version is mismatched and the target code is absent.
=== CRITICAL PROHIBITIONS ===
- Do NOT classify a run as a terminal failure or assume a bug is fixed based on git log entries, commit titles,
or commit messages. Reproducibility can ONLY be determined by executing reproducer candidates in the VM.
- Do NOT suggest C code strategies, repairs, or namespace bypasses when setting 'TerminalError'.
=== PHASE 2: BUG REPRODUCTION (EVALUATION) ===
The executed program was a full reproducer candidate attempting to trigger the target bug/crash.
Use this to guide your classification and feedback:
1. If a crash was triggered (Reproduced is true):
- Determine if the triggered crash matches the expected bug.
- If you conclude they represent the same underlying bug (the same root cause)
despite different titles, crash signatures, or call traces, set TitleMatches
to true and provide a detailed, technical, and verbose explanation of the
equivalence in the 'Feedback' field.
- If they do not represent the same bug (a completely unrelated crash/collision),
set TitleMatches to false and explain the collision in 'Feedback'.
- If they match exactly, set TitleMatches to true and provide a brief confirmation in 'Feedback'.
2. If the execution was successful (exit 0) WITHOUT a crash (Reproduced is false):
- The reproduction attempt failed to trigger the bug. Analyze the console/strace output
to understand why the bug did not trigger (e.g., timing, input arguments, environment setup)
and provide feedback on how to improve the reproducer logic to trigger the crash.
Critical Diagnostic Rule for Reproduction Failures:
If the reproduction attempt fails (e.g., a system call returns an error, or a
warning/error message appears in the console log), you MUST:
1. Identify the failing system call from the execution trace or strace output.
2. Identify any corresponding warning or error messages in the console log.
3. Immediately search the kernel source tree for the warning message strings or
the code of the failing system call/subsystem to locate the validation logic.
4. Trace the kernel's validation logic to diagnose the exact constraint violation
or input mismatch in the generated program.
5. Provide a technical diagnosis in the feedback explaining the exact kernel constraint that was violated and why.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Bug Description: BUG: unable to handle kernel paging request in iowrite32
thunderbolt 0000:00:07.0: timeout resetting host router
BUG: unable to handle page fault for address: ffffc90000f70208
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1b000067 P4D 1b000067 PUD 1c2b9067 PMD 30b6b067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_mask_interrupt drivers/thunderbolt/nhi.c:-1 [inline]
nhi_disable_interrupts+0x150/0x350 drivers/thunderbolt/nhi.c:162
nhi_probe+0x2be/0x880 drivers/thunderbolt/nhi.c:1211
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59e119e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dd5f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f59e1425fa0 RCX: 00007f59e119e019
RDX: 000000000000000d RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f59e123500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59e1426038 R14: 00007f59e1425fa0 R15: 00007fffc2eb28b8
</TASK>
Modules linked in:
CR2: ffffc90000f70208
---[ end trace 0000000000000000 ]---
RIP: 0010:writel arch/x86/include/asm/io.h:67 [inline]
RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 89 fd e8 00 ad e7 fc 48 81 fb 00 00 04 00 72 09 e8 f2 ac e7 fc <89> 2b eb 52 48 81 fb 01 00 01 00 72 0c e8 e0 ac e7 fc 89 e8 89 da
RSP: 0018:ffffc9000f73f7f0 EFLAGS: 00010287
RAX: ffffffff84df75ce RBX: ffffc90000f70208 RCX: 0000000000100000
RDX: ffffc9000ee92000 RSI: 00000000000b3ba8 RDI: 00000000000b3ba9
RBP: 00000000ffffffff R08: ffffc9000f73f3a7 R09: 1ffff92001ee7e74
R10: dffffc0000000000 R11: fffff52001ee7e75 R12: 1ffff110025ead11
R13: ffffc90000f70208 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f59dd5f56c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000f70208 CR3: 00000000430ad000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: f3 0f 1e fa endbr64
10: 55 push %rbp
11: 53 push %rbx
12: 48 89 f3 mov %rsi,%rbx
15: 89 fd mov %edi,%ebp
17: e8 00 ad e7 fc call 0xfce7ad1c
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 f2 ac e7 fc call 0xfce7ad1c
* 2a: 89 2b mov %ebp,(%rbx) <-- trapping instruction
2c: eb 52 jmp 0x80
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0c jb 0x43
37: e8 e0 ac e7 fc call 0xfce7ad1c
3c: 89 e8 mov %ebp,%eax
3e: 89 da mov %ebx,%edx
IsProbe: false
Reproduced: true
Console Output: Warning: Permanently added '[localhost]:23425' (ED25519) to the list of known hosts.
[ 66.772482][ T5875] thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
[ 66.775529][ T5875] thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
[ 66.826037][ T5875] BUG: unable to handle page fault for address: ffffc90003c99640
[ 66.828437][ T5875] #PF: supervisor read access in kernel mode
[ 66.830400][ T5875] #PF: error_code(0x0000) - not-present page
[ 66.832891][ T5875] PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 18bddc067 PTE 0
[ 66.835274][ T5875] Oops: Oops: 0000 [#1] SMP KASAN NOPTI
[ 66.837011][ T5875] CPU: 1 UID: 0 PID: 5875 Comm: syz-executor277 Not tainted syzkaller #1 PREEMPT(full)
[ 66.839954][ T5875] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 66.843041][ T5875] RIP: 0010:ioread32+0x1c/0x80
[ 66.844520][ T5875] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
[ 66.850386][ T5875] RSP: 0018:ffffc900046df850 EFLAGS: 00010293
[ 66.852268][ T5875] RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
[ 66.854693][ T5875] RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
[ 66.857141][ T5875] RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
[ 66.859572][ T5875] R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
[ 66.861996][ T5875] R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
[ 66.864420][ T5875] FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
[ 66.867133][ T5875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 66.869171][ T5875] CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
[ 66.871646][ T5875] Call Trace:
[ 66.872712][ T5875] <TASK>
[ 66.873653][ T5875] nhi_probe+0xcc/0x880
[ 66.874976][ T5875] nhi_pci_probe+0x46b/0x580
[ 66.876413][ T5875] ? __pfx_nhi_pci_probe+0x10/0x10
[ 66.877999][ T5875] ? __pfx__raw_spin_lock_bh+0x10/0x10
[ 66.879672][ T5875] ? lockdep_hardirqs_on+0x7a/0x110
[ 66.881280][ T5875] ? _raw_spin_unlock_irqrestore+0x4c/0x80
[ 66.883097][ T5875] pci_device_probe+0x431/0xc90
[ 66.884604][ T5875] ? up_write+0x19f/0x4a0
[ 66.885972][ T5875] ? __pfx_pci_device_probe+0x10/0x10
[ 66.887632][ T5875] ? kernfs_put+0x7b9/0x820
[ 66.889066][ T5875] ? kernfs_create_link+0x187/0x200
[ 66.890669][ T5875] ? sysfs_do_create_link_sd+0xe0/0x110
[ 66.892376][ T5875] ? driver_sysfs_add+0x1fe/0x210
[ 66.893955][ T5875] ? __pfx_pci_device_probe+0x10/0x10
[ 66.895602][ T5875] really_probe+0x254/0xae0
[ 66.897041][ T5875] __driver_probe_device+0x1e8/0x360
[ 66.898677][ T5875] device_driver_attach+0xe0/0x1d0
[ 66.900291][ T5875] bind_store+0x1d0/0x220
[ 66.901653][ T5875] ? __pfx_sysfs_kf_write+0x10/0x10
[ 66.903281][ T5875] kernfs_fop_write_iter+0x3a4/0x540
[ 66.904930][ T5875] vfs_write+0x612/0xba0
[ 66.906261][ T5875] ? __pfx_vfs_write+0x10/0x10
[ 66.907770][ T5875] ? do_sys_openat2+0x14e/0x200
[ 66.909303][ T5875] ? kmem_cache_free+0x182/0x650
[ 66.910842][ T5875] ? fd_install+0x94/0x3d0
[ 66.912256][ T5875] ksys_write+0x150/0x270
[ 66.913611][ T5875] ? __pfx_ksys_write+0x10/0x10
[ 66.915138][ T5875] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 66.917020][ T5875] do_syscall_64+0x174/0x580
[ 66.918461][ T5875] ? trace_irq_disable+0x3b/0x140
[ 66.920041][ T5875] ? clear_bhb_loop+0x40/0x90
[ 66.921531][ T5875] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 66.923389][ T5875] RIP: 0033:0x7fbbd4aa6bf7
[ 66.924790][ T5875] Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[ 66.930709][ T5875] RSP: 002b:00007fffa5b186f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 66.933505][ T5875] RAX: ffffffffffffffda RBX: 0000555595193400 RCX: 00007fbbd4aa6bf7
[ 66.935940][ T5875] RDX: 000000000000000c RSI: 0000555595195883 RDI: 0000000000000004
[ 66.938367][ T5875] RBP: 00007fbbd4ae31e8 R08: 0000000000000000 R09: 0000000000000000
[ 66.940794][ T5875] R10: 0000000000000000 R11: 0000000000000202 R12: 0000555595195883
[ 66.943248][ T5875] R13: 00007fbbd4ae8bce R14: 00007fbbd4ae6e4c R15: 000000000001ffff
[ 66.945680][ T5875] </TASK>
[ 66.946655][ T5875] Modules linked in:
[ 66.947873][ T5875] CR2: ffffc90003c99640
[ 66.949193][ T5875] ---[ end trace 0000000000000000 ]---
[ 66.950883][ T5875] RIP: 0010:ioread32+0x1c/0x80
[ 66.952388][ T5875] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
[ 66.958286][ T5875] RSP: 0018:ffffc900046df850 EFLAGS: 00010293
[ 66.960158][ T5875] RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
[ 66.962600][ T5875] RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
[ 66.965046][ T5875] RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
[ 66.967489][ T5875] R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
[ 66.969936][ T5875] R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
[ 66.972357][ T5875] FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
[ 66.975080][ T5875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 66.977094][ T5875] CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
[ 66.979549][ T5875] Kernel panic - not syncing: Fatal exception
[ 66.982122][ T5875] Kernel Offset: disabled
[ 66.983467][ T5875] Rebooting in 86400 seconds..
Strace Output:
Crash Report: thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
BUG: unable to handle page fault for address: ffffc90003c99640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 18bddc067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 5875 Comm: syz-executor277 Not tainted syzkaller #1 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_probe+0xcc/0x880 drivers/thunderbolt/nhi.c:1198
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbd4aa6bf7
Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fffa5b186f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555595193400 RCX: 00007fbbd4aa6bf7
RDX: 000000000000000c RSI: 0000555595195883 RDI: 0000000000000004
RBP: 00007fbbd4ae31e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000555595195883
R13: 00007fbbd4ae8bce R14: 00007fbbd4ae6e4c R15: 000000000001ffff
</TASK>
Modules linked in:
CR2: ffffc90003c99640
---[ end trace 0000000000000000 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: f3 0f 1e fa endbr64
12: 55 push %rbp
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
17: e8 a2 b2 e7 fc call 0xfce7b2be
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 94 b2 e7 fc call 0xfce7b2be
* 2a: 8b 03 mov (%rbx),%eax <-- trapping instruction
2c: eb 55 jmp 0x83
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0a jb 0x41
37: e8 82 b2 e7 fc call 0xfce7b2be
3c: 89 da mov %ebx,%edx
3e: ed in (%dx),%eax
3f: eb .byte 0xeb
|
| 203/4 |
2026/08/10 08:43 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 13935
output: 37
thoughts: 359
Thoughts: **My Thought Process on Investigating the Reproduced Bug**
Alright, so the core task here is to figure out what's going on with this newly generated program and its crash. The ultimate goal is to see if it actually reproduces the original bug we were tracking, which was a `BUG: unable to handle kernel paging request in iowrite32`.
I've been given the crash trace from the original bug, and I can see it points to a page fault occurring within `iowrite32`, which was invoked by `nhi_disable_interrupts`, and ultimately that chain leads back to `nhi_probe` in `drivers/thunderbolt/nhi.c`. This gives me a clear starting point for the original problem.
Now, I have the crash trace from the *reproduced* bug. It's also a `BUG: unable to handle page fault`, which is promising, but the details are slightly different. The address it's faulting on is `fffc900003c99640`, and it's a `supervisor read access in kernel mode` with an `error_code(0x0000) - not-present page`. Crucially, the `RIP` is showing `ioread32+0x1c/0x80`.
Comparing the two, I can see the original bug was in `iowrite32`, but this new one is in `ioread32`. Both are I/O read/write operations, and both are happening in kernel mode due to a page fault. The call trace for the reproduced bug shows `ioread32` being called directly from `nhi_probe`, which then leads to `nhi_pci_probe`. This is a bit different from the original, where it went through `nhi_disable_interrupts` first.
So, the immediate next step is to dive into the `nhi_probe` function itself. I need to understand its logic, especially around how it handles I/O operations, and see if there's a path that could lead to `ioread32` being called in a way that causes a page fault, particularly in the context of what the original bug might have been triggered by. I'm going to use my `codesearch-definition-source` tool to get the source code definition for `nhi_probe` in `drivers/thunderbolt/nhi.c`. This will allow me to scrutinize the function's implementation and identify any potential areas of concern that might explain this new page fault.
|
| 204/4 |
2026/08/10 08:44 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_probe]
Results: map[SourceCode:1186: int nhi_probe(struct tb_nhi *nhi)
1187: {
1188: struct device *dev = nhi->dev;
1189: struct tb *tb;
1190: int res;
1191:
1192: if (!nhi->ops)
1193: return dev_err_probe(dev, -EINVAL, "NHI ops not set\n");
1194:
1195: if (!nhi->ops->init_interrupts)
1196: return dev_err_probe(dev, -EINVAL, "missing required NHI ops\n");
1197:
1198: nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
1199: dev_dbg(dev, "total paths: %d\n", nhi->hop_count);
1200:
1201: nhi->tx_rings = devm_kcalloc(dev, nhi->hop_count,
1202: sizeof(*nhi->tx_rings), GFP_KERNEL);
1203: nhi->rx_rings = devm_kcalloc(dev, nhi->hop_count,
1204: sizeof(*nhi->rx_rings), GFP_KERNEL);
1205: if (!nhi->tx_rings || !nhi->rx_rings)
1206: return -ENOMEM;
1207:
1208: nhi_reset(nhi);
1209:
1210: /* In case someone left them on. */
1211: nhi_disable_interrupts(nhi);
1212:
1213: res = nhi->ops->init_interrupts(nhi);
1214: if (res)
1215: return dev_err_probe(dev, res, "cannot enable interrupts, aborting\n");
1216:
1217: spin_lock_init(&nhi->lock);
1218:
1219: res = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
1220: if (res)
1221: return dev_err_probe(dev, res, "failed to set DMA mask\n");
1222:
1223: if (nhi->ops->init) {
1224: res = nhi->ops->init(nhi);
1225: if (res)
1226: return dev_err_probe(dev, res, "NHI specific init failed\n");
1227: }
1228:
1229: tb = nhi_select_cm(nhi);
1230: if (!tb)
1231: return dev_err_probe(dev, -ENODEV,
1232: "failed to determine connection manager, aborting\n");
1233:
1234: dev_dbg(dev, "NHI initialized, starting thunderbolt\n");
1235:
1236: init_completion(&nhi->domain_released);
1237:
1238: res = tb_domain_add(tb, host_reset);
1239: if (res) {
1240: /*
1241: * At this point the RX/TX rings might already have been
1242: * activated. Do a proper shutdown.
1243: */
1244: tb_domain_put(tb);
1245: wait_for_completion(&nhi->domain_released);
1246: nhi_shutdown(nhi);
1247: return dev_err_probe(dev, res, "failed to add domain\n");
1248: }
1249: dev_set_drvdata(dev, tb);
1250:
1251: device_wakeup_enable(dev);
1252:
1253: pm_runtime_allow(dev);
1254: pm_runtime_set_autosuspend_delay(dev, TB_AUTOSUSPEND_DELAY);
1255: pm_runtime_use_autosuspend(dev);
1256: pm_runtime_put_autosuspend(dev);
1257:
1258: return 0;
1259: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 205/4 |
2026/08/10 08:44 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 15514
output: 40
thoughts: 205
Thoughts: **My Thought Process Unraveling the Kernel Crash**
Alright, let's dive into this. I've got two crash reports here, and they both seem to be pointing to the same underlying problem. The first crash, the one I'm seeing now, is happening at `nhi_probe+0xcc/0x880`, specifically on line 1198: `nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;`. The original crash, the one I was initially looking at, was at `nhi_probe+0x2be/0x880`, which corresponds to line 1211: `nhi_disable_interrupts(nhi);`. Digging a bit deeper, that call chain leads to `nhi_mask_interrupt`, and within that, I see an `iowrite32` operation.
Now, the crucial observation here is that both these crashes manifest as page faults. This immediately tells me that we're trying to access memory that isn't valid or hasn't been mapped correctly. Looking at the specific operations, both the `ioread32` and the `iowrite32` operations are attempting to interact with memory addresses derived from `nhi->iobase`. Therefore, the common thread, the absolute root cause, is that `nhi->iobase` is being accessed when it's not a valid, mapped memory address. It's an invalid pointer.
To figure out *why* `nhi->iobase` is invalid, my next logical step is to trace its origin. I need to understand how and where `nhi->iobase` gets its value. This means I'm going to meticulously examine the `nhi_pci_probe` function. That's where the PCI device is initialized and where I expect `nhi->iobase` to be populated. By stepping through `nhi_pci_probe`, I'm confident I'll find the point where the allocation or mapping of I/O memory for this device either fails or is incorrectly handled, leading to this invalid address being assigned.
|
| 206/4 |
2026/08/10 08:44 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_probe]
Results: map[SourceCode: 447: static int nhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
448: {
449: struct device *dev = &pdev->dev;
450: struct tb_nhi_pci *nhi_pci;
451: struct tb_nhi *nhi;
452: int res;
453:
454: if (!nhi_pci_imr_valid(pdev))
455: return dev_err_probe(dev, -ENODEV, "firmware image not valid, aborting\n");
456:
457: res = pcim_enable_device(pdev);
458: if (res)
459: return dev_err_probe(dev, res, "cannot enable PCI device, aborting\n");
460:
461: nhi_pci = devm_kzalloc(dev, sizeof(*nhi_pci), GFP_KERNEL);
462: if (!nhi_pci)
463: return -ENOMEM;
464:
465: nhi = &nhi_pci->nhi;
466: nhi->dev = dev;
467: nhi->ops = (const struct tb_nhi_ops *)id->driver_data ?: &pci_nhi_default_ops;
468:
469: nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");
470: res = PTR_ERR_OR_ZERO(nhi->iobase);
471: if (res)
472: return dev_err_probe(dev, res, "cannot obtain PCI resources, aborting\n");
473:
474: nhi_pci_check_quirks(nhi_pci);
475: nhi_pci_check_iommu(nhi_pci);
476:
477: pci_set_master(pdev);
478:
479: return nhi_probe(&nhi_pci->nhi);
480: }
SourceFile:drivers/thunderbolt/pci.c]
|
| 207/4 |
2026/08/10 08:44 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 16376
output: 37
thoughts: 1286
Thoughts: **My Thought Process Unraveling a PCI Driver Crash**
I've been diving into a rather perplexing crash scenario involving a PCI driver. It all started when I observed that `pcim_iomap_region`, a function crucial for mapping PCI BARs, returns a pointer. The question that immediately arose was: what happens if the PCI device has a BAR0 of zero length? Does `pcim_iomap_region` still return a valid-looking pointer, or does it fail gracefully?
Then, I noticed the crash itself, manifesting as a page fault at specific addresses like `ffffc90003c99640` or `ffffc90000f70208`. These addresses strongly suggested `vmalloc` or `ioremap` regions, which are expected to be valid. This led me to ponder why a fault would occur in such a context. Several possibilities came to mind:
* Perhaps the PCI device was removed unexpectedly.
* Or maybe the memory space it was trying to access had been disabled.
* Another thought was that `pcim_iomap_region` might successfully map the region, but the PCI device itself might not actually respond to memory accesses, or its memory space simply wasn't enabled in the first place.
I recalled that `pcim_enable_device` is responsible for enabling the device, which in turn should enable its memory space if BARs are present. However, I then considered more complex interactions:
* Could the `syzkaller` reproducer be modifying the PCI configuration space, perhaps via `sysfs`, to disable the memory space (by clearing the Memory Space Enable bit in the Command register) concurrently with the driver's operations?
* Or, if it's a virtual device like `syz_pci`, it might not truly back the BAR with memory, or it could unmap it altogether.
The reproducer itself was a key piece of information. I noted that it specifically uses `sysfs` to bind the device to the thunderbolt driver. This observation was crucial when I compared the original crash path with the reproduced one. Both showed the exact same sequence: `bind_store` calling into `kernfs_fop_write_iter`.
The distinction, however, lay in *where* within that path the crash occurred. In the original crash, the fault happened in `iowrite32` within `nhi_disable_interrupts`. In the reproduced crash, it was in `ioread32` within `nhi_probe`, which occurs earlier in the same function chain. This discrepancy made me wonder:
* Did the first `ioread32` in the original crash succeed, but a later `iowrite32` failed?
* Or was the memory space being disabled concurrently by another thread in the original scenario?
I then looked closer at the reproducer's behavior. While it binds the driver, I needed to ascertain if it was also concurrently writing to PCI configuration space.
The reproduced crash output then offered a significant clue:
```
[ 66.772482][ T5875] thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
[ 66.775529][ T5875] thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
```
This indicated that the probe for `0000:00:03.0` had failed *before* the page fault. This was a critical realization. If the probe failed, `nhi_probe` would return an error, and `really_probe` would then perform cleanup.
However, the stack trace of the crash itself showed the fault occurring *within* `nhi_probe`:
```
nhi_probe+0xcc/0x880
nhi_pci_probe+0x46b/0x580
pci_device_probe+0x431/0xc90
really_probe+0x254/0xae0
__driver_probe_device+0x1e8/0x360
device_driver_attach+0xe0/0x1d0
bind_store+0x1d0/0x220
```
This presented a seeming contradiction: the console log stated the probe failed, yet the crash stack trace placed it *during* the probe. This led me to question:
* Was the crash occurring on `0000:00:03.0`, or was it possibly a different device altogether?
* Could the reproducer be binding multiple devices, or perhaps attempting to bind the same device multiple times?
* Was it possible that `0000:00:03.0` failed its probe, and then the reproducer proceeded to bind `0000:00:04.0` or even attempt to bind `0000:00:03.0` again, leading to the crash?
I then recalled the original crash, which involved `thunderbolt 0000:00:07.0: timeout resetting host router`, followed by a page fault. The "timeout resetting host router" error originates from `nhi_reset`, and I specifically noted that `nhi_reset` performs `iowrite32` operations. This detail prompted me to revisit the `nhi_reset` function to examine its behavior more closely.
|
| 208/4 |
2026/08/10 08:44 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_reset]
Results: map[SourceCode:1132: static void nhi_reset(struct tb_nhi *nhi)
1133: {
1134: ktime_t timeout;
1135: u32 val;
1136:
1137: val = ioread32(nhi->iobase + REG_CAPS);
1138: /* Reset only v2 and later routers */
1139: if (FIELD_GET(REG_CAPS_VERSION_MASK, val) < REG_CAPS_VERSION_2)
1140: return;
1141:
1142: if (!host_reset) {
1143: dev_dbg(nhi->dev, "skipping host router reset\n");
1144: return;
1145: }
1146:
1147: iowrite32(REG_RESET_HRR, nhi->iobase + REG_RESET);
1148: msleep(100);
1149:
1150: timeout = ktime_add_ms(ktime_get(), 500);
1151: do {
1152: val = ioread32(nhi->iobase + REG_RESET);
1153: if (!(val & REG_RESET_HRR)) {
1154: dev_warn(nhi->dev, "host router reset successful\n");
1155: return;
1156: }
1157: usleep_range(10, 20);
1158: } while (ktime_before(ktime_get(), timeout));
1159:
1160: dev_warn(nhi->dev, "timeout resetting host router\n");
1161: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 209/4 |
2026/08/10 08:44 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 18178
output: 41
thoughts: 1238
Thoughts: **My Thought Process on the Thunderbolt Driver Crash**
Ah, this original crash log looks incredibly familiar and highly suggestive. I'm seeing `thunderbolt 0000:00:07.0: timeout resetting host router` immediately followed by `BUG: unable to handle page fault for address: ffffc90000f70208`. This sequence strongly indicates that the `nhi_reset` function, which is responsible for resetting the host router, is indeed timing out and returning that specific error message. The subsequent page fault then happens *after* `nhi_reset` has completed, during the execution of `nhi_disable_interrupts` within `nhi_probe`.
The critical question for me is *why* this page fault is occurring in `nhi_disable_interrupts`. My initial thought leans towards the PCI device becoming unavailable. If the device has been removed or its memory space has been disabled, the memory region previously mapped using `ioremap` would no longer be valid. However, simply accessing a disabled memory space via `ioread32` typically results in a return value of `0xffffffff` (all ones), not a page fault, unless the underlying page table entry (PTE) has been completely unmapped.
So, the core of my investigation becomes: under what circumstances could a PTE for an `ioremap`'d address become unmapped while the `nhi_probe` function is still actively executing and holding the device lock?
If the device were hot-removed, the PCI subsystem would likely call functions like `pci_disable_device`, `pci_release_regions`, or `iounmap`. But since `nhi_probe` is still running and holds the device lock, it seems highly improbable that another thread could be performing these unmapping operations. This lock acquisition suggests exclusive access to the device's resources during the probing phase.
My mind then drifts to how `pcim_iomap_region` manages its mappings. It uses the device resource management (`devres`) framework. If `pcim_iomap_region` is used, the mapped region is automatically unmapped when the device is unbound. But here, we are in the *middle* of the binding process (the probe itself). So, the unbinding shouldn't have happened yet.
Could there be a scenario where the device is removed via sysfs, specifically the `remove` file? I recall `pci_stop_and_remove_bus_device` is involved in such operations. A quick check reveals that `pci_stop_and_remove_bus_device` eventually calls `device_release_driver`, which *does* acquire the device lock. This means that a sysfs removal attempt from another context would likely block until `nhi_probe` completes, thus preventing it from causing the unmapping during the probe.
What about virtual PCI devices? For devices like `syz_pci` or `vkms`, the memory backing their I/O regions might be managed differently and could potentially be freed. In QEMU, a hot-unplugged PCI device could have its memory region removed from the guest's physical address space. However, I'd expect this to result in a machine check exception or a `0xffffffff` read, not a kernel page fault indicating a "not-present page" in the kernel's page tables.
The specific error `BUG: unable to handle page fault for address: ffffc90003c99640` with a "not-present page" PTE points very strongly to `vunmap` or `iounmap` having been called. The question remains: who is calling `iounmap` during probe? The likely candidate is `pcim_iomap_release`, which is invoked during device unbinding or when probe fails.
But the crash is *during* the probe! This creates a paradox. Could `pcim_iomap_release` be called prematurely within the probe itself? It wouldn't be called if `pcim_iomap_region` *failed* to map, but the initial log suggests `nhi_reset` was called, implying the probe had progressed beyond the initial mapping stage. And `pci_disable_device` isn't the culprit here.
Then I look at the reproduced crash log carefully:
```
[ 66.772482][ T5875] thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
[ 66.775529][ T5875] thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
[ 66.826037][ T5875] BUG: unable to handle page fault for address: ffffc90003c99640
...
[ 66.871646][ T5875] Call Trace:
[ 66.872712][ T5875] <TASK>
[ 66.873653][ T5875] nhi_probe+0xcc/0x880
```
This specific reproduced crash occurs during the probe of `0000:00:03.0`, failing with `-EINVAL` (cannot enable interrupts), and *then* a page fault happens. The page fault is occurring within `nhi_probe` at the line `ioread32(nhi->iobase + REG_CAPS)`.
Now, here's a crucial point: the *probe for `0000:00:03.0` failed*. But the page fault occurs afterwards. Is this page fault happening on the *same device* that just failed its probe, or a *different* one? If the reproducer mechanism binds the device, it fails, and then attempts to bind it *again*, that would trigger `nhi_pci_probe` once more.
If the device is bound again, `pcim_iomap_region` is called again. And because `pcim_iomap_region` uses `devres`, any previous successful mapping for this device during the first probe would have been cleaned up by `devres` upon probe failure, which includes calling `iounmap`. So, the second call to `pcim_iomap_region` would be attempting to map the I/O region again.
The key question now is: why would this *second* attempt to map and then access the memory cause a page fault, even if `pcim_iomap_region` is called again and it might return the same virtual address? If it was successfully mapped again, the PTE should be valid! Unless... `pcim_iomap_region` itself is encountering an issue or not actually establishing the mapping correctly on the second attempt, or some other race condition is occurring during the re-probing process. I need to delve into the specifics of `pcim_iomap_region`'s behavior in this context.
|
| 210/4 |
2026/08/10 08:44 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/pci/pci.c Name:pcim_iomap_region]
Results: map[SourceCode: 593: /**
594: * pcim_iomap_region - Request and iomap a PCI BAR
595: * @pdev: PCI device to map IO resources for
596: * @bar: Index of a BAR to map
597: * @name: Name of the driver requesting the resource
598: *
599: * Returns: __iomem pointer on success, an IOMEM_ERR_PTR on failure.
600: *
601: * Mapping and region will get automatically released on driver detach. If
602: * desired, release manually only with pcim_iounmap_region().
603: */
604: void __iomem *pcim_iomap_region(struct pci_dev *pdev, int bar,
605: const char *name)
606: {
607: int ret;
608: struct pcim_addr_devres *res;
609:
610: if (!pci_bar_index_is_valid(bar))
611: return IOMEM_ERR_PTR(-EINVAL);
612:
613: res = pcim_addr_devres_alloc(pdev);
614: if (!res)
615: return IOMEM_ERR_PTR(-ENOMEM);
616:
617: res->type = PCIM_ADDR_DEVRES_TYPE_REGION_MAPPING;
618: res->bar = bar;
619:
620: ret = pci_request_region(pdev, bar, name);
621: if (ret != 0)
622: goto err_region;
623:
624: res->baseaddr = pci_iomap(pdev, bar, 0);
625: if (!res->baseaddr) {
626: ret = -EINVAL;
627: goto err_iomap;
628: }
629:
630: devres_add(&pdev->dev, res);
631: return res->baseaddr;
632:
633: err_iomap:
634: pci_release_region(pdev, bar);
635: err_region:
636: pcim_addr_devres_free(res);
637:
638: return IOMEM_ERR_PTR(ret);
639: }
SourceFile:drivers/pci/devres.c]
|
| 211/4 |
2026/08/10 08:44 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 20170
output: 38
thoughts: 182
Thoughts: **My Thought Process Regarding `pcim_iomap_region` and Error Handling**
Okay, let's break down what's going through my head right now, and it all centers around this specific piece of code related to PCI resource mapping. I'm looking at the `nhi_pci_probe` function, and I've just noticed something about how it handles the return value of `pcim_iomap_region`.
My initial thought is a bit of a "wait a minute..." moment. I see that `pcim_iomap_region` is supposed to return an I/O memory address, but crucially, the documentation or my understanding tells me it returns `IOMEM_ERR_PTR(ret)` when something goes wrong. This `IOMEM_ERR_PTR` macro is the key here. It's a common pattern in the kernel for functions that can return either a valid pointer or an error code wrapped in a pointer-sized integer.
Then, I look at how this return value is used. The code immediately following the call to `pcim_iomap_region` is:
```c
res = PTR_ERR_OR_ZERO(nhi->iobase);
if (res)
return dev_err_probe(dev, res, "cannot obtain PCI resources, aborting\n");
```
This is where my brain really kicks into gear. I know that `PTR_ERR_OR_ZERO` is designed to take a pointer that *might* be an error pointer, and if it is, it extracts the actual error code. If it's a valid pointer, it returns zero. This seems perfectly sensible on the surface.
However, my critical observation is this: `pcim_iomap_region` *explicitly* returns `IOMEM_ERR_PTR(ret)` on failure. This means `nhi->iobase` in the failure case *will* be a pointer that has been constructed using `IOMEM_ERR_PTR`.
So, my question becomes: what exactly *is* `IOMEM_ERR_PTR`? Is it simply wrapping a standard error number like `-ENOMEM` or `-ENODEV`? Or is it some other specific mechanism? The fact that `PTR_ERR_OR_ZERO` is used implies that `IOMEM_ERR_PTR` is designed to be compatible with the generic `PTR_ERR` mechanism (which `PTR_ERR_OR_ZERO` likely uses internally). If `IOMEM_ERR_PTR` just wraps a standard `ERRNO` value, then `PTR_ERR_OR_ZERO` should correctly identify it as an error and extract the `errno`. But I need to be absolutely sure about the exact implementation of `IOMEM_ERR_PTR` to confirm that `PTR_ERR_OR_ZERO` is indeed the correct and intended way to handle its failure return. My underlying concern is whether there's a subtle mismatch or an assumption being made about the error handling mechanism that might lead to unexpected behavior if `IOMEM_ERR_PTR` doesn't behave precisely as `PTR_ERR_OR_ZERO` expects.
|
| 212/4 |
2026/08/10 08:44 |
tool |
codesearch-definition-source |
0m
Error:
Args: map[ContextFile:include/linux/err.h Name:IOMEM_ERR_PTR]
Results: map[SourceCode: SourceFile:]
|
| 213/4 |
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llm |
repro-oracle |
0m
Model:
Tokens:
input: 20395
output: 23
thoughts: 14
Thoughts: **The Genesis of a Search:**
Alright, so I'm in the thick of it, wrestling with some sort of memory-related issue. I've been staring at this code, trying to pinpoint the source of a problem, and a specific string keeps popping into my head: `IOMEM_ERR_PTR`. It feels like a crucial piece of the puzzle, a potential indicator of where things are going awry. It's not just a random guess; my intuition, honed by years of experience in this domain, is telling me this identifier is likely tied to handling errors when accessing I/O memory. So, the most logical next step, the immediate imperative, is to **grep for `IOMEM_ERR_PTR`**. I need to see where this is being used, how it's being propagated, and what context it's appearing in. This search is the most direct path to uncovering the underlying behavior and hopefully, the root cause of the problem I'm facing.
|
| 214/4 |
2026/08/10 08:44 |
tool |
grepper |
0m
Args: map[Expression:#define IOMEM_ERR_PTR]
Results: map[Output:include/linux/err.h=39=static __always_inline void * __must_check ERR_PTR(long error)
--
include/linux/err.h-55-/* Cast an error pointer to __iomem. */
include/linux/err.h:56:#define IOMEM_ERR_PTR(error) (__force void __iomem *)ERR_PTR(error)
include/linux/err.h-57-
]
|
| 215/4 |
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llm |
repro-oracle |
0m
Model:
Tokens:
input: 20537
output: 40
thoughts: 255
Thoughts: **My Thought Process Regarding `nhi_pci_probe` and Potential `ioread32` Faults**
Okay, so I'm digging into this `nhi_pci_probe` function and trying to understand how an `ioread32` could possibly page fault. My initial thought is that `IOMEM_ERR_PTR` is simply `ERR_PTR` cast to `void __iomem *`, and `PTR_ERR_OR_ZERO` handles it just fine. This means that if `pcim_iomap_region` fails, `nhi_pci_probe` correctly returns an error. Conversely, if `pcim_iomap_region` *succeeds*, then `nhi->iobase` *should* be a valid pointer.
This leads me to the core of my confusion: if `nhi->iobase` is indeed a valid pointer after `pcim_iomap_region` succeeds, then why would `ioread32` be causing a page fault? My first instinct is to suspect a race condition. Could `nhi->iobase` be freed by another thread concurrently? Specifically, what if the PCI device is unbound at the same time? However, I recall that `bind_store` acquires `device_lock`, which *should* prevent this kind of concurrent unbinding from invalidating `nhi->iobase`.
So, if it's not being freed, what else could be going wrong? My next hypothesis is that `nhi->iobase` might not be truly invalid, but rather the underlying PCI device itself is problematic. What if it's a virtual device, and its BAR (Base Address Register) is configured with a size of 0? Or, perhaps, even if it has a BAR, it's not actually mapped correctly into memory space by the kernel?
Then I remember that `pci_iomap` is the function responsible for mapping the BAR. This brings me back to the BAR length. If the BAR has a length of 0, what does `pci_iomap` do? Does it fail outright, or does it return some specific value that I'm not properly accounting for? I need to go and examine the implementation of `pci_iomap` to understand its behavior in such edge cases. That seems like the most logical next step to resolve this page fault mystery.
|
| 216/4 |
2026/08/10 08:45 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:lib/pci_iomap.c Name:pci_iomap]
Results: map[SourceCode: 109: /**
110: * pci_iomap - create a virtual mapping cookie for a PCI BAR
111: * @dev: PCI device that owns the BAR
112: * @bar: BAR number
113: * @maxlen: length of the memory to map
114: *
115: * Using this function you will get a __iomem address to your device BAR.
116: * You can access it using ioread*() and iowrite*(). These functions hide
117: * the details if this is a MMIO or PIO address space and will just do what
118: * you expect from them in the correct way.
119: *
120: * @maxlen specifies the maximum length to map. If you want to get access to
121: * the complete BAR without checking for its length first, pass %0 here.
122: * */
123: void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
124: {
125: return pci_iomap_range(dev, bar, 0, maxlen);
126: }
SourceFile:drivers/pci/iomap.c]
|
| 217/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 21170
output: 42
thoughts: 14
Thoughts: **A Deep Dive into `pci_iomap_range` and Its Implications**
My immediate thought upon encountering this problem is to investigate the `pci_iomap_range` function. I need to understand its exact purpose, how it's intended to be used within the PCI subsystem, and more importantly, what potential issues or edge cases it might introduce or, conversely, mitigate. I'm thinking about its role in mapping I/O memory regions for PCI devices. This function likely deals with the complexities of address translation, bus mastering, and ensuring proper access to device-specific registers and memory. I'm particularly interested in its interaction with the underlying hardware and the operating system's memory management. Are there any known performance bottlenecks associated with its usage? Could there be race conditions if not handled carefully, especially in concurrent access scenarios? I'm also considering the implications for device drivers – what level of abstraction does `pci_iomap_range` provide, and what responsibilities are still left to the driver itself? Understanding the return values and potential error conditions will be crucial for robust driver development. I need to ascertain if it provides the necessary guarantees for reliable communication with the PCI device. The name itself, `iomap_range`, suggests a focus on mapping a specific range of I/O addresses. This implies that the function is probably responsible for setting up the necessary mappings in the system's I/O address space. I'm curious about how it handles alignment requirements, if any, and what happens if the requested range is invalid or overlaps with existing mappings. Furthermore, I need to consider its relationship with other PCI-related functions, such as those for device discovery and resource allocation. Does `pci_iomap_range` rely on prior successful resource allocation, or does it perform some of that validation itself? My objective is to gain a comprehensive understanding of its behavior and its place in the larger ecosystem of PCI device management, so that I can confidently assess its role in the current problem and identify any potential vulnerabilities or areas for optimization.
|
| 218/4 |
2026/08/10 08:45 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/pci/iomap.c Name:pci_iomap_range]
Results: map[SourceCode: 14: /**
15: * pci_iomap_range - create a virtual mapping cookie for a PCI BAR
16: * @dev: PCI device that owns the BAR
17: * @bar: BAR number
18: * @offset: map memory at the given offset in BAR
19: * @maxlen: max length of the memory to map
20: *
21: * Using this function you will get a __iomem address to your device BAR.
22: * You can access it using ioread*() and iowrite*(). These functions hide
23: * the details if this is a MMIO or PIO address space and will just do what
24: * you expect from them in the correct way.
25: *
26: * @maxlen specifies the maximum length to map. If you want to get access to
27: * the complete BAR from offset to the end, pass %0 here.
28: * */
29: void __iomem *pci_iomap_range(struct pci_dev *dev,
30: int bar,
31: unsigned long offset,
32: unsigned long maxlen)
33: {
34: resource_size_t start, len;
35: unsigned long flags;
36:
37: if (!pci_bar_index_is_valid(bar))
38: return NULL;
39:
40: start = pci_resource_start(dev, bar);
41: len = pci_resource_len(dev, bar);
42: flags = pci_resource_flags(dev, bar);
43:
44: if (len <= offset || !start)
45: return NULL;
46:
47: len -= offset;
48: start += offset;
49: if (maxlen && len > maxlen)
50: len = maxlen;
51: if (flags & IORESOURCE_IO)
52: return __pci_ioport_map(dev, start, len);
53: if (flags & IORESOURCE_MEM)
54: return ioremap(start, len);
55: /* What? */
56: return NULL;
57: }
SourceFile:drivers/pci/iomap.c]
|
| 219/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 21861
output: 37
thoughts: 334
Thoughts: **The Curious Case of the `ioremap`ed Page Fault**
So, I'm thinking about this `ioremap` situation. The core of it is, if `ioremap` gives me a valid pointer, why would I get a page fault when I try to access it? It seems counterintuitive. My immediate thought is about the physical address `start` being invalid. But then I recall how `ioremap` works: it's supposed to map a physical address into the kernel's page tables. If the physical address isn't backed by anything, like on x86, I'd expect reads to just return all ones (effectively `0xffffffff`), and writes to be silently dropped. A page fault, specifically a "not-present page" fault (`error_code(0x0000)` or `error_code(0x0002)`), indicates that the page table entry *itself* is missing. How could that happen for an address that `ioremap` supposedly set up?
This leads me to consider a couple of scenarios. Firstly, perhaps the region was unmapped *after* `ioremap` but *before* the access. This would happen if `iounmap` was called in the interim. Secondly, I might be accessing an address *beyond* the region that was actually mapped. For instance, `ioremap` might have mapped only 4KB, but my current operation is attempting to read from an offset that's 8KB into the intended BAR.
This brings me to a crucial point: what *is* the size of this BAR? I know that if the BAR size is reported as 0, `pci_iomap_range` would have returned NULL. But if the size is, say, just 1 byte, `ioremap` will still map a full page, which is 4KB. So, even with a tiny BAR, the mapped region is substantial. The real question then becomes, if I'm accessing an offset beyond that initial 4KB (or whatever the mapped size is), that's where the problem might lie.
Looking at the `nhi_probe` function, I see this line: `nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;`. This is where the potential issue arises. I need to understand what `REG_CAPS` represents and, more importantly, its offset relative to `nhi->iobase`. If `REG_CAPS` is located beyond the initial mapped region of the BAR, and the BAR itself was mapped with a size that doesn't encompass `REG_CAPS`, then I'd get that "not-present page" fault because the page table entry for that specific address would indeed be missing. That's the puzzle I'm trying to solve here.
|
| 220/4 |
2026/08/10 08:45 |
tool |
codesearch-definition-source |
0m
Error:
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:REG_CAPS]
Results: map[SourceCode: SourceFile:]
|
| 221/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 22237
output: 20
thoughts: 11
Thoughts: **My Thought Process on Approaching the `REG_CAPS` Search**
Alright, so my immediate impulse, as I'm scanning this text and looking to understand the context around `REG_CAPS`, is to see where this specific string appears. My mind automatically goes to the most direct and efficient method for finding exact occurrences of a pattern within a body of text, especially when I'm dealing with code or configuration-like data.
Therefore, my first internal step is to think: "How can I quickly locate every instance of `REG_CAPS`?" And that naturally leads me to the command-line utility `grep`. It's the go-to tool for this kind of pattern matching. So, in my head, the action is quite straightforward: "Let's grep for `REG_CAPS`." It's not a complex inference or a deep dive into semantics at this stage; it's a tactical decision driven by the need for precise identification of the target string. I'm not thinking about *why* it's there yet, or what its implications are, but simply *where* it is. This initial `grep` command is my first step in orienting myself within the data and understanding its distribution.
|
| 222/4 |
2026/08/10 08:45 |
tool |
grepper |
0m
Args: map[Expression:#define REG_CAPS]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-113-/* The last 11 bits contain the number of hops supported by the NHI port. */
drivers/thunderbolt/nhi_regs.h:114:#define REG_CAPS 0x39640
drivers/thunderbolt/nhi_regs.h:115:#define REG_CAPS_VERSION_MASK GENMASK(23, 16)
drivers/thunderbolt/nhi_regs.h:116:#define REG_CAPS_VERSION_2 0x40
drivers/thunderbolt/nhi_regs.h-117-
]
|
| 223/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 22443
output: 40
thoughts: 391
Thoughts: **My Thought Process Unraveling the Crash**
Okay, so my initial thought upon seeing `REG_CAPS` with the value `0x39640` was to immediately translate that hexadecimal value into a more tangible byte count. I realized `0x39640` equates to 235072 bytes, which is roughly 229 KB. This number is significant because it represents a potential size requirement for a memory-mapped I/O (MMIO) region.
My next crucial realization was the potential for a mismatch between the required size (`REG_CAPS`) and the actual size of the Base Address Register (BAR) that gets `ioremap`ped. If the BAR is smaller than `0x39640 + 4` (I'm adding 4 for potential alignment or boundary considerations), then the `ioremap` call will effectively map a smaller region than what the device might expect.
This immediately raised a red flag: if the mapped region is smaller than what's needed, then an attempt to access `nhi->iobase + 0x39640` would very likely be *out of bounds* of the actually mapped region. Knowing that `ioremap` (and `vmalloc`) space is typically protected with guard pages, I understood that attempting to access memory beyond these boundaries would trigger a page fault, which aligns perfectly with the observed crash behavior.
To confirm this hypothesis, I turned my attention to the crash addresses. I noticed a striking similarity between the reproduced crash address (`CR2: ffffc90003c99640`, `RBX: ffffc90003c99640`) and the `REG_CAPS` value. Specifically, the lower bits of the reproduced crash address, `0x9640`, are a direct match to the tail end of `0x39640`. This led me to deduce that if `nhi->iobase` happened to be `ffffc90003c60000`, then `nhi->iobase + 0x39640` would precisely result in `ffffc90003c99640`, matching the `CR2` value reported in the crash. This was a strong indicator.
Then, I examined the *original* crash address (`CR2: ffffc90000f70208`, `RBX: ffffc90000f70208`). The lower bits here are `0x0208`. I recalled that the original crash occurred within the `iowrite32` function in `nhi_disable_interrupts`. While the exact origin of `0x0208` wasn't immediately obvious from the `REG_CAPS` value alone, the consistent pattern seen in the *reproduced* crash, coupled with the knowledge of the function where the original crash occurred, strongly suggested that the issue stemmed from the `REG_CAPS` offset being used to access memory that wasn't properly mapped due to BAR size limitations. The `0x0208` in the original crash likely represents a different offset or an earlier symptom of a similar underlying problem, but the reproduced crash data with the `0x9640` tail provided the smoking gun for my current line of investigation.
|
| 224/4 |
2026/08/10 08:45 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_disable_interrupts]
Results: map[SourceCode: 152: /*
153: * nhi_disable_interrupts() - disable interrupts for all rings
154: *
155: * Use only during init and shutdown.
156: */
157: void nhi_disable_interrupts(struct tb_nhi *nhi)
158: {
159: int i = 0;
160: /* disable interrupts */
161: for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
162: nhi_mask_interrupt(nhi, ~0, 4 * i);
163:
164: /* clear interrupt status bits */
165: for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++)
166: nhi_clear_interrupt(nhi, 4 * i);
167: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 225/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 23138
output: 39
thoughts: 12
Thoughts: **My Thought Process Regarding `nhi_mask_interrupt`**
Right, so the immediate priority for me is to investigate `nhi_mask_interrupt`. I need to understand its functionality, its current state, and how it's interacting with the broader system. My initial instinct is to dive into the code itself, examining its definition and any associated configurations or dependencies. I'll be looking for clarity on what it actually *does* – is it a flag, a handler, a mechanism for selective interruption? Understanding its purpose is foundational. Then, I'll trace its execution path. Where is it called? What conditions trigger its invocation? Conversely, what conditions allow it to be bypassed or de-asserted? This will give me a sense of its operational context. Furthermore, I'll be scrutinizing its impact. Does it correctly enable or disable specific interrupts as intended? Are there any unintended side effects or potential race conditions that might arise from its use? My goal is to establish a definitive understanding of `nhi_mask_interrupt`'s behavior, its intended purpose, and its actual implementation, before moving on to any further analysis or modifications.
|
| 226/4 |
2026/08/10 08:45 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:nhi_mask_interrupt]
Results: map[SourceCode: 51: static void nhi_mask_interrupt(struct tb_nhi *nhi, int mask, int ring)
52: {
53: if (nhi->quirks & QUIRK_AUTO_CLEAR_INT) {
54: u32 val;
55:
56: val = ioread32(nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
57: iowrite32(val & ~mask, nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
58: } else {
59: iowrite32(mask, nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring);
60: }
61: }
SourceFile:drivers/thunderbolt/nhi.c]
|
| 227/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 23403
output: 29
thoughts: 18
Thoughts: **My Thought Process Regarding `REG_RING_INTERRUPT_MASK_CLEAR_BASE`**
Okay, so my immediate mental leap is to dissect that identifier, `REG_RING_INTERRUPT_MASK_CLEAR_BASE`. It's clearly a macro or a constant defined within a hardware register context, and as an expert, I know these naming conventions are designed to be informative.
First, the `REG_` prefix immediately tells me I'm dealing with a hardware register. This isn't some arbitrary software variable; it's a specific memory location within a chip that controls or reflects the state of some hardware component.
Then comes `RING`. This is the key functional area. My mind immediately goes to ring buffers, circular buffers, or perhaps some kind of signaling ring architecture. In the context of interrupts, a ring buffer often implies a mechanism for accumulating and reporting events or data. It could be a descriptor ring for DMA, a completion ring for an accelerator, or a message passing ring. The "ring" nature suggests a cyclical, fixed-size structure where new items replace old ones or where a pointer moves around.
The next part, `INTERRUPT`, is self-explanatory. This register is directly involved with interrupt generation, masking, or handling. This means it's related to signaling the CPU or another processing unit that an event has occurred.
Now, `MASK_CLEAR`. This is where the action becomes clear. It's not just about *enabling* or *disabling* interrupts in a general sense, but specifically about *clearing* a mask. Interrupt masks are used to selectively ignore or acknowledge specific interrupt sources. So, `MASK_CLEAR` implies that I'm performing an operation that *unmasks* or *enables* a particular interrupt source that was previously masked. This is crucial for fine-grained control over interrupt flow, allowing specific events to be heard while others remain silent. The "clear" operation often implies writing a specific value (like a '1' to a bit position) to a mask register to de-assert a masking condition.
Finally, `BASE`. This is the clincher. The `BASE` suffix strongly suggests that this identifier represents the starting address or the base register for a block of registers related to the ring interrupt masking functionality. It's unlikely to be a single bit or a single register on its own. Instead, it's the entry point into a set of registers that collectively manage the interrupt masks for the ring. I'd expect to find related offsets from this `BASE` address for individual interrupt sources within the ring, or perhaps other control/status registers associated with this ring's interrupt handling. This `BASE` value is what I'd use to calculate the addresses of other related registers by adding offsets.
So, in essence, my thought process is: "This is a hardware register, specifically related to interrupt control for a ring-based component, and this particular identifier points to the base address for the register block responsible for *clearing* (i.e., unmasking) specific interrupt sources within that ring." It's a fundamental building block for enabling targeted interrupt notifications from a ring mechanism.
|
| 228/4 |
2026/08/10 08:45 |
tool |
grepper |
0m
Args: map[Expression:#define REG_RING_INTERRUPT_MASK_CLEAR_BASE]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-101-
drivers/thunderbolt/nhi_regs.h:102:#define REG_RING_INTERRUPT_MASK_CLEAR_BASE 0x38208
drivers/thunderbolt/nhi_regs.h-103-
]
|
| 229/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 23546
output: 42
thoughts: 1802
Thoughts: **It seems I've pinpointed the root cause of these crashes.** My initial thought was to look at the crash addresses themselves, specifically `0x38208`. I noticed that the lower bits, `8208`, seemed significant, and then I recalled the original crash address: `ffffc90000f70208`. By hypothesizing that `nhi->iobase` was `ffffc90000f38000`, I saw that `nhi->iobase + 0x38208` perfectly matched the crash address. This strongly suggested that the problem was an out-of-bounds MMIO access due to an undersized PCI BAR.
Then, I started to analyze the relationship between `0x38208` and `REG_CAPS` (which is `0x39640`). My initial logic was that if the BAR was large enough to cover `0x39640`, it should certainly cover the smaller `0x38208`. This led me to question why the original crash occurred at `0x38208` and not at `REG_CAPS`.
I re-examined the `nhi_probe` function and considered a BAR size, say `0x39000`. Under this assumption, `0x38208` would be within the BAR, but `0x39640` would be outside. This, however, contradicted the original crash, which *didn't* crash at `REG_CAPS`.
I then considered a BAR size of `0x38000`. With this, `0x38208` would be out of bounds. But again, `REG_CAPS` (`0x39640`) would *also* be out of bounds. The crucial insight here was how `ioremap` functions: it maps in page granularity (4KB). If the BAR size was `0x38000`, `ioremap` would map exactly that much. This means `0x38208` would fall into the *next* unmapped page, and `REG_CAPS` at `0x39640` would be in the page *after that*. So, if `0x38208` was unmapped, `0x39640` should also be unmapped. This still didn't explain why the `ioread32` at `REG_CAPS` in the original crash didn't fail.
I went back to the original crash trace, which showed the crash happening at line 1211 of `nhi.c`, which is `nhi_disable_interrupts(nhi);`. This confirmed that `ioread32(nhi->iobase + REG_CAPS)` at line 1198 had successfully executed. This was the critical point: `REG_CAPS` *was* accessible, but `0x38208` was not. This is counter-intuitive since `0x39640` is numerically larger than `0x38208`.
I then looked at the physical addresses involved. If `nhi->iobase` was `ffffc90000f38000`, then `nhi->iobase + 0x38208` results in `ffffc90000f70208`. The address for `REG_CAPS`, `nhi->iobase + 0x39640`, would be `ffffc90000f71640`. I realized these addresses fall into *different* memory pages (page `0x38000` for the former, and `0x39000` for the latter, relative to the mapped region).
My hypothesis is now that `ioremap` mapped a range that *included* the page containing `0x39640`, but *excluded* the page containing `0x38208`. This would happen if, for instance, `ioremap` was called with a length that ended *just before* the start of the page containing `0x38208`, but extended into the page containing `0x39640`. The fact that the original crash occurred at `0x38208` and the new one at `0x38208` further solidifies that this specific offset is the problem, and my reasoning that the BAR size is too small to encompass it is correct. The current analysis suggests that the BAR size is too small, leading to an unmapped region at `0x38208`, while `REG_CAPS` at `0x39640` might be in a mapped region, or its access is somehow more resilient or happens before the problematic access in a different scenario. The key is that `0x38208` is definitely out of bounds for the BAR. The fact that I'm now seeing the same issue at `0x38208` confirms it's the same underlying bug.
|
| 230/4 |
2026/08/10 08:45 |
tool |
codesearch-definition-source |
0m
Error:
Args: map[ContextFile:drivers/thunderbolt/nhi.c Name:RING_INTERRUPT_REG_COUNT]
Results: map[SourceCode: SourceFile:]
|
| 231/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 25395
output: 25
thoughts: 16
Thoughts: **My Thought Process for Investigating the `RING_INTERRUPT_REG_COUNT` Symbol**
Okay, so the immediate thought that comes to mind when presented with the task of summarizing this particular "thought" is a very direct one: I need to understand the *purpose* and *implication* of searching for a specific symbol like `RING_INTERRUPT_REG_COUNT` using a tool like `grep`. Given that I'm an expert in this domain, my mind naturally jumps to the underlying systems and contexts where such a symbol would appear.
My internal monologue would likely start with something like: "Alright, what does `RING_INTERRUPT_REG_COUNT` even mean? The name itself is a strong clue." I'd break it down:
* **`RING`**: This immediately suggests some kind of circular buffer, queue, or ring buffer mechanism. In system programming and driver development, ring buffers are ubiquitous for efficient data transfer and interrupt handling. Think network packets, DMA operations, or event queues.
* **`INTERRUPT`**: This is unambiguous. It points to an interrupt service routine (ISR) or some form of interrupt-driven notification. This means the system is reacting to an event, and this symbol is likely related to managing those events.
* **`REG_COUNT`**: This part is interesting. `REG` could mean register, but in this context, given `COUNT`, it's more likely referring to the *number of registers* involved in some interrupt-related operation. Or, perhaps more pertinently, it's a *count* of something *related to interrupt registers*. The most plausible interpretation, especially in the context of ring buffers and interrupts, is that it signifies the number of entries or slots within a ring buffer that are *specifically designated for interrupt-related data or status*. This could be the number of interrupt status registers, the number of descriptors in an interrupt ring, or even the number of interrupt queues.
So, the initial hypothesis is that `RING_INTERRUPT_REG_COUNT` is a constant or a variable that defines the size or capacity of a ring buffer used for managing or reporting interrupt events.
Now, *why would I `grep` for it?*
My expertise tells me that `grep` is a fundamental tool for code searching. If I'm looking for this symbol, it means I'm trying to:
1. **Locate its definition:** Where is this constant/variable declared and initialized? This is the most basic step. Knowing its definition will reveal its data type, its value, and potentially the scope in which it's used.
2. **Understand its usage:** Where is this value being *read* from and *written* to? This is crucial for understanding the *behavior* of the system.
* **Reads:** If I see it being read, it's likely being used to:
* Initialize the size of a data structure (e.g., `allocate_ring_buffer(RING_INTERRUPT_REG_COUNT)`).
* Control loop iterations in an ISR or a polling mechanism that processes interrupts (`for (i = 0; i < RING_INTERRUPT_REG_COUNT; i++)`).
* Check bounds or validity of an index into an interrupt-related array or buffer.
* Configure hardware registers that might expect a count of interrupt sources or descriptors.
* **Writes:** If I see it being written to, it's less likely to be a "count" in the sense of a mutable counter, and more likely that its *value* is being *assigned* to something else, or perhaps a configuration register is being programmed with this count. However, if it *is* mutable, it could indicate dynamic adjustment of interrupt handling capacity, which would be a significant observation.
3. **Identify related components:** By seeing where `RING_INTERRUPT_REG_COUNT` is used, I can pinpoint the specific modules, drivers, or subsystems that are responsible for interrupt handling and ring buffer management. This helps in understanding the architecture.
4. **Debug or analyze behavior:** If I'm facing an issue related to interrupt processing, performance bottlenecks, or incorrect interrupt signaling, finding all occurrences of this symbol would be a primary debugging step. It would help me trace the flow of interrupt-related data and identify potential misconfigurations or logic errors.
5. **Understand system configuration:** In some systems, constants like these might be configurable via build flags or configuration files. `grep` would help me find where these configurations are applied or referenced.
So, when I think "Let's grep for `RING_INTERRUPT_REG_COUNT`," it's not just a command; it's the initiation of a deep dive into the interrupt handling subsystem. It's about systematically uncovering how the system manages its interrupt events, what its capacity is, and how these parameters are applied throughout the code. It's a signal that I'm about to start mapping out a critical piece of the system's operational logic. The "thought" is the precursor to action, a strategic move in understanding complex software.
|
| 232/4 |
2026/08/10 08:45 |
tool |
grepper |
0m
Args: map[Expression:#define RING_INTERRUPT_REG_COUNT]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-99-#define REG_RING_INTERRUPT_BASE 0x38200
drivers/thunderbolt/nhi_regs.h:100:#define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
drivers/thunderbolt/nhi_regs.h-101-
]
|
| 233/4 |
2026/08/10 08:45 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 25559
output: 24
thoughts: 2318
Thoughts: **The Unraveling of the Page Fault: A Deep Dive into Memory Mapping and Device State**
My mind is racing, trying to piece together this perplexing page fault. The initial thought process centered around `RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)`, which relies on `nhi->hop_count` read from `REG_CAPS`. My immediate concern was, if `REG_CAPS` was unmapped, `ioread32` would trigger a page fault. Yet, the original crash report indicated no page fault on `REG_CAPS`, suggesting it *was* mapped. This implied that the memory region starting from `nhi->iobase` up to `0x39640` (the offset for `REG_CAPS`) was indeed mapped.
This leads to a critical question: if this region was mapped, why did a later access, specifically `nhi->iobase + 0x38208 + 4*i` (where `0x38208` is `REG_RING_INTERRUPT_MASK_CLEAR_BASE`), cause a page fault? I initially reasoned that `i` being very large could be the culprit. If `nhi->hop_count` was its maximum value of `0x3ff` (1023), then `RING_INTERRUPT_REG_COUNT` becomes 64, meaning `i` could go up to 63. The maximum address accessed would be `0x38208 + 4 * 63 = 0x38304`. This address is still well within the same page as `0x38208` and importantly, *less* than `0x39640`. So, if `0x39640` was mapped, `0x38208` absolutely should have been.
I briefly entertained the idea that `nhi->iobase` might not be mapped contiguously, but quickly dismissed it, as `ioremap` guarantees contiguous mappings. Then, my attention shifted to the page fault error code: `#PF: supervisor write access in kernel mode` and `#PF: error_code(0x0002) - not-present page`. This indicates a write attempt to a page that's not present in the page tables. However, `ioremap` typically maps pages as read-write. So, why would a page be marked as "not-present" for writing, yet potentially present for reading? Or perhaps it wasn't present for reading either, and we just didn't attempt to read it in that specific erroneous sequence.
This brings me back to the original crash. If `REG_CAPS` (at `0x39640`) was mapped and readable, how could `REG_RING_INTERRUPT_MASK_CLEAR_BASE` (at `0x38208`) be unmapped? The offset `0x39640` is greater than `0x38208`. If the BAR encompasses `0x39640`, it *must* encompass `0x38208`.
Then, a crucial realization struck me: the original crash *didn't* page fault on `REG_CAPS`. The *reproduced* crash *did* page fault on `ioread32(nhi->iobase + REG_CAPS)`. This fundamentally changes the scenario. In the reproduced crash, the very *first* memory access to `REG_CAPS` caused the page fault. This means that at the moment `ioread32(nhi->iobase + REG_CAPS)` was executed, the page containing `REG_CAPS` was simply not mapped.
This leads to a new line of inquiry: if `REG_CAPS` was unmapped, how could any subsequent accesses be expected to succeed, especially if they are to addresses within the same BAR? The original crash, which faulted *later*, might have had a different BAR size initially, or the mapping was valid at the time of the `REG_CAPS` read, but became invalid for later accesses.
Considering the possibility of concurrent operations, could the device have been hot-unplugged or its memory unmapped concurrently? If `iounmap` happened *between* the successful read of `REG_CAPS` (in the original crash scenario, which is now in question) and the subsequent write, it would explain a later page fault. However, with the *reproduced* crash faulting on the *initial* `ioread32(REG_CAPS)`, the timing of an unmap is less relevant to that specific fault point, but it's still a strong contender for the *original* crash's behavior.
My current thought process is that the core issue is the dynamic nature of memory mapping and device state. The fact that `REG_CAPS` (at `0x39640`) and `REG_RING_INTERRUPT_MASK_CLEAR_BASE` (at `0x38208`) are at different offsets within the BAR is key. If the BAR size itself is smaller than `0x39640`, then *both* could be unmapped. But if `REG_CAPS` was read successfully in one instance, it implies it *was* mapped at that time. This suggests a race condition or a state change of the device's memory mapping. The most plausible explanation for a page fault on an `ioremap`-ed region is that `iounmap` was called. The crucial question becomes: how is `iounmap` being called concurrently or out of sync with driver operations, especially given the `device_lock`? Perhaps an alternative device removal path or a specific VF scenario is bypassing this lock. The fact that it's a write fault on a "not-present" page strongly points to the underlying physical memory no longer being mapped into the kernel's virtual address space.
|
| 234/4 |
2026/08/10 08:46 |
tool |
grepper |
0m
Args: map[Expression:#define REG_RING_NOTIFY_BASE]
Results: map[Output:drivers/thunderbolt/nhi_regs.h=34=struct ring_desc {
--
drivers/thunderbolt/nhi_regs.h-89- */
drivers/thunderbolt/nhi_regs.h:90:#define REG_RING_NOTIFY_BASE 0x37800
drivers/thunderbolt/nhi_regs.h-91-#define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
]
|
| 235/4 |
2026/08/10 08:46 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 28021
output: 40
thoughts: 2447
Thoughts: **The Curious Case of the Unmapped Register**
I've been trying to untangle this crash, and it's been a real journey of deduction. Initially, I was fixated on the addresses themselves. I noted that `0x37800` was smaller than `0x39640`, and by extension, all those registers I was looking at were smaller than `0x39640`. My thought process was, if `0x39640` is mapped, how could `0x38208` possibly be unmapped? This seemed like a contradiction that needed explaining.
Then I went back to the original crash trace, specifically the call stack:
```
nhi_mask_interrupt drivers/thunderbolt/nhi.c:-1 [inline]
nhi_disable_interrupts+0x150/0x350 drivers/thunderbolt/nhi.c:162
nhi_probe+0x2be/0x880 drivers/thunderbolt/nhi.c:1211
```
The crash occurred in `nhi_mask_interrupt`, which looks like this:
```c
static void nhi_mask_interrupt(struct tb_nhi *nhi, int mask, int ring)
{
if (nhi->quirks & QUIRK_AUTO_CLEAR_INT) {
u32 val;
val = ioread32(nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
iowrite32(val & ~mask, nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
} else {
iowrite32(mask, nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring);
}
}
```
I observed that if the `QUIRK_AUTO_CLEAR_INT` quirk was set, it accessed `REG_RING_INTERRUPT_BASE + ring`, which translates to `0x38200 + ring`. If it wasn't set (the `else` branch), it accessed `REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring`, which is `0x38208 + ring`.
The crash address ended in `0208`, which meant it definitely accessed `0x38208`. This implied that `ring` was 0 and the code took the `else` branch, crashing on the very first iteration of the loop with `iowrite32(mask, nhi->iobase + 0x38208);`.
This led me to a crucial question: why did it crash on this `iowrite32` to `0x38208`, but *not* on the `ioread32(nhi->iobase + 0x39640)` that happened earlier in `nhi_probe`?
My initial thoughts were about the `nhi->iobase` pointer changing, but that's highly unlikely as it's a stable pointer within the `struct tb_nhi`. Then I considered if `ioread32` to an unmapped address might behave differently than `iowrite32` on certain architectures, but page faults generally occur for both on non-present pages.
The breakthrough came when I considered the possibility that the page table entry *was* present, but was marked READ-ONLY. If that were the case, `ioread32` would succeed, but `iowrite32` would indeed cause a page fault. However, the `ioremap` function typically maps pages as read-write (`PAGE_KERNEL_IO`), so a read-only mapping seemed improbable.
Then I looked at the error code from the crash: `#PF: error_code(0x0002) - not-present page`. The 'Present' bit (bit 0) was 0, confirming the page was not present. The 'Write' bit (bit 1) was 1, indicating a write access. If the page was truly not present, a *read* access to `REG_CAPS` (`0x39640`) should also have caused a page fault, with an error code of `0x0000`. This discrepancy was the key.
How could it survive the `ioread32(REG_CAPS)` if the page was not present? I started thinking about memory mapping and the virtual address space. `0x39640` falls into page `0x39000`, and `0x38208` falls into page `0x38000`. Could page `0x39000` be present, while page `0x38000` was not?
My understanding of `ioremap` is that it maps a *contiguous* physical range. It allocates a contiguous virtual range and then maps the physical pages. The idea of `ioremap` failing halfway or someone calling `vunmap` on a partial range seemed unlikely, as `ioremap` would return NULL, and `vunmap` unmaps the whole area.
Then I considered what happens if the physical address wraps around. But the `pci_iomap_range` function has a check: `if (len <= offset || !start) return NULL;`. So, if `start` is 0, it should return NULL, preventing mapping of physical address 0.
This led me to a new hypothesis, which feels quite plausible now. What if the issue isn't with memory being unmapped in the way I was thinking, but rather with the *size* of the mapped region? The crash trace shows `nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");`. This maps BAR 0. What if BAR 0 is unexpectedly small, say, only 4KB?
If the mapped region is only 4KB, then accessing `nhi->iobase + 0x39640` (which is 235KB into the mapping) would be out of bounds. Now, why wouldn't that cause a page fault on the `ioread32`? This is where the nature of the virtual memory system comes into play. The vmalloc space is densely packed, and there are guard pages between allocations. It's entirely possible that `nhi->iobase + 0x39640` *accidentally* fell into *another* valid vmalloc mapping that happened to be adjacent. In this scenario, `ioread32` would simply read garbage data from that unrelated mapping and *not* trigger a page fault.
However, `nhi->iobase + 0x38208` (230KB into the mapping) might have landed in a guard page or an unmapped hole between vmalloc regions. This would then cause the page fault on `iowrite32`, as observed. This would perfectly explain why the read succeeded but the write failed, and why the crash occurred later in the function.
The crucial missing piece, in my opinion, is that the driver never checks the *size* of the BAR it's mapping. If a malicious or virtual PCI device (like syz_pci) provides a BAR 0 with a tiny size, the driver proceeds assuming it's large enough, leading to these out-of-bounds accesses. The observed behavior seems to be a direct consequence of this missing BAR size validation.
|
| 236/4 |
2026/08/10 08:46 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_probe]
Results: map[SourceCode: 447: static int nhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
448: {
449: struct device *dev = &pdev->dev;
450: struct tb_nhi_pci *nhi_pci;
451: struct tb_nhi *nhi;
452: int res;
453:
454: if (!nhi_pci_imr_valid(pdev))
455: return dev_err_probe(dev, -ENODEV, "firmware image not valid, aborting\n");
456:
457: res = pcim_enable_device(pdev);
458: if (res)
459: return dev_err_probe(dev, res, "cannot enable PCI device, aborting\n");
460:
461: nhi_pci = devm_kzalloc(dev, sizeof(*nhi_pci), GFP_KERNEL);
462: if (!nhi_pci)
463: return -ENOMEM;
464:
465: nhi = &nhi_pci->nhi;
466: nhi->dev = dev;
467: nhi->ops = (const struct tb_nhi_ops *)id->driver_data ?: &pci_nhi_default_ops;
468:
469: nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");
470: res = PTR_ERR_OR_ZERO(nhi->iobase);
471: if (res)
472: return dev_err_probe(dev, res, "cannot obtain PCI resources, aborting\n");
473:
474: nhi_pci_check_quirks(nhi_pci);
475: nhi_pci_check_iommu(nhi_pci);
476:
477: pci_set_master(pdev);
478:
479: return nhi_probe(&nhi_pci->nhi);
480: }
SourceFile:drivers/thunderbolt/pci.c]
|
| 237/4 |
2026/08/10 08:46 |
llm |
repro-oracle |
0m
Model:
Tokens:
input: 31125
output: 18
thoughts: 191
Thoughts: **My Thought Process Regarding PCI Resource Allocation**
It's become strikingly apparent to me that there's a critical oversight in the current driver implementation: the complete absence of a check for `pci_resource_len(pdev, 0)`. This is a significant vulnerability. The driver is operating under the dangerous assumption that the memory region allocated for BAR 0 is inherently large enough to accommodate all the registers it needs to access.
My immediate concern is to identify the absolute maximum register offset that the driver might attempt to access. Initially, I considered `REG_CAPS`, which has an offset of `0x39640`. However, I then recalled `RING_INTERRUPT_REG_COUNT`, which can be as large as 64. Coupled with `REG_RING_INTERRUPT_MASK_CLEAR_BASE` at `0x38208`, this immediately pushes the potential maximum to `0x38208 + 4 * 64 = 0x38308`. This is already close to `REG_CAPS`.
This leads me to question if there are other registers beyond these that I haven't yet considered. To get a definitive answer and ensure I'm not missing anything, my next step must be to meticulously examine `nhi_regs.h` to identify the absolute highest register offset defined within the driver's register map. This comprehensive review is essential for understanding the true extent of BAR 0's required size and to rectify this potentially exploitable flaw.
|
| 238/4 |
2026/08/10 08:46 |
tool |
grepper |
0m
Args: map[Expression:#define REG_]
Results: map[Output:
Full output is too long, showing 500 out of 22435 lines.
Use more precise expression if possible.
arch/alpha/kernel/pc873xx.h-8- */
arch/alpha/kernel/pc873xx.h:9:#define REG_FER 0x00
arch/alpha/kernel/pc873xx.h:10:#define REG_FAR 0x01
arch/alpha/kernel/pc873xx.h:11:#define REG_PTR 0x02
arch/alpha/kernel/pc873xx.h:12:#define REG_FCR 0x03
arch/alpha/kernel/pc873xx.h:13:#define REG_PCR 0x04
arch/alpha/kernel/pc873xx.h:14:#define REG_KRR 0x05
arch/alpha/kernel/pc873xx.h:15:#define REG_PMC 0x06
arch/alpha/kernel/pc873xx.h:16:#define REG_TUP 0x07
arch/alpha/kernel/pc873xx.h:17:#define REG_SID 0x08
arch/alpha/kernel/pc873xx.h:18:#define REG_ASC 0x09
arch/alpha/kernel/pc873xx.h:19:#define REG_IRC 0x0e
arch/alpha/kernel/pc873xx.h-20-
--
arch/arc/include/asm/disasm.h=22=enum flow {
--
arch/arc/include/asm/disasm.h-71-#define STATUS32_L 0x00000100
arch/arc/include/asm/disasm.h:72:#define REG_LIMM 62
arch/arc/include/asm/disasm.h-73-
--
arch/arc/kernel/ptrace.c=15=struct pt_regs_offset {
--
arch/arc/kernel/ptrace.c-19-
arch/arc/kernel/ptrace.c:20:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/arc/kernel/ptrace.c:21:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/arc/kernel/ptrace.c-22-
--
arch/arc/kernel/ptrace.c=161=static int genregs_set(struct task_struct *target,
--
arch/arc/kernel/ptrace.c-169-
arch/arc/kernel/ptrace.c:170:#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
arch/arc/kernel/ptrace.c-171- if (!ret) \
--
arch/arc/kernel/ptrace.c-176-
arch/arc/kernel/ptrace.c:177:#define REG_IN_ONE(LOC, PTR) \
arch/arc/kernel/ptrace.c-178- if (!ret) \
--
arch/arc/kernel/ptrace.c-183-
arch/arc/kernel/ptrace.c:184:#define REG_IGNORE_ONE(LOC) \
arch/arc/kernel/ptrace.c-185- if (!ret) \
--
arch/arc/kernel/unwind.c=56=UNW_REGISTER_INFO};
--
arch/arc/kernel/unwind.c-61-#ifndef REG_INVALID
arch/arc/kernel/unwind.c:62:#define REG_INVALID(r) (reg_info[r].width == 0)
arch/arc/kernel/unwind.c-63-#endif
--
arch/arc/net/bpf_jit_arcv2.c=65=static const u8 bpf2arc[][2] = {
--
arch/arc/net/bpf_jit_arcv2.c-90-
arch/arc/net/bpf_jit_arcv2.c:91:#define REG_LO(r) (bpf2arc[(r)][0])
arch/arc/net/bpf_jit_arcv2.c:92:#define REG_HI(r) (bpf2arc[(r)][1])
arch/arc/net/bpf_jit_arcv2.c-93-
--
arch/arm/include/debug/brcmstb.S-6-/* Physical register offset and virtual register offset */
arch/arm/include/debug/brcmstb.S:7:#define REG_PHYS_BASE 0xf0000000
arch/arm/include/debug/brcmstb.S:8:#define REG_PHYS_BASE_V7 0x08000000
arch/arm/include/debug/brcmstb.S:9:#define REG_VIRT_BASE 0xfc000000
arch/arm/include/debug/brcmstb.S:10:#define REG_PHYS_ADDR(x) ((x) + REG_PHYS_BASE)
arch/arm/include/debug/brcmstb.S:11:#define REG_PHYS_ADDR_V7(x) ((x) + REG_PHYS_BASE_V7)
arch/arm/include/debug/brcmstb.S-12-
--
arch/arm/kernel/perf_regs.c=11=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/arm/kernel/perf_regs.c-18-
arch/arm/kernel/perf_regs.c:19:#define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
arch/arm/kernel/perf_regs.c-20-
--
arch/arm/kernel/ptrace.c-32-
arch/arm/kernel/ptrace.c:33:#define REG_PC 15
arch/arm/kernel/ptrace.c:34:#define REG_PSR 16
arch/arm/kernel/ptrace.c-35-/*
--
arch/arm/kernel/ptrace.c=59=struct pt_regs_offset {
--
arch/arm/kernel/ptrace.c-63-
arch/arm/kernel/ptrace.c:64:#define REG_OFFSET_NAME(r) \
arch/arm/kernel/ptrace.c-65- {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
arch/arm/kernel/ptrace.c:66:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/arm/kernel/ptrace.c-67-
--
arch/arm/mach-exynos/firmware.c=216=void __init exynos_firmware_init(void)
--
arch/arm/mach-exynos/firmware.c-237-
arch/arm/mach-exynos/firmware.c:238:#define REG_CPU_STATE_ADDR (sysram_ns_base_addr + 0x28)
arch/arm/mach-exynos/firmware.c-239-#define BOOT_MODE_MASK 0x1f
--
arch/arm/mach-exynos/suspend.c-35-
arch/arm/mach-exynos/suspend.c:36:#define REG_TABLE_END (-1U)
arch/arm/mach-exynos/suspend.c-37-
--
arch/arm/mach-hisi/platsmp.c=129=static const struct smp_operations hix5hd2_smp_ops __initconst = {
--
arch/arm/mach-hisi/platsmp.c-139-#define HIP01_BOOT_ADDRESS 0x80000000
arch/arm/mach-hisi/platsmp.c:140:#define REG_SC_CTRL 0x000
arch/arm/mach-hisi/platsmp.c-141-
--
arch/arm/mach-imx/anatop.c-15-
arch/arm/mach-imx/anatop.c:16:#define REG_SET 0x4
arch/arm/mach-imx/anatop.c:17:#define REG_CLR 0x8
arch/arm/mach-imx/anatop.c-18-
--
arch/arm/mach-omap2/omap_twl.c=40=static u8 smps_offset;
arch/arm/mach-omap2/omap_twl.c-41-
arch/arm/mach-omap2/omap_twl.c:42:#define REG_SMPS_OFFSET 0xE0
arch/arm/mach-omap2/omap_twl.c-43-
--
arch/arm/nwfpe/fpmodule.h-14-
arch/arm/nwfpe/fpmodule.h:15:#define REG_ORIG_R0 17
arch/arm/nwfpe/fpmodule.h:16:#define REG_CPSR 16
arch/arm/nwfpe/fpmodule.h:17:#define REG_PC 15
arch/arm/nwfpe/fpmodule.h:18:#define REG_LR 14
arch/arm/nwfpe/fpmodule.h:19:#define REG_SP 13
arch/arm/nwfpe/fpmodule.h:20:#define REG_IP 12
arch/arm/nwfpe/fpmodule.h:21:#define REG_FP 11
arch/arm/nwfpe/fpmodule.h:22:#define REG_R10 10
arch/arm/nwfpe/fpmodule.h:23:#define REG_R9 9
arch/arm/nwfpe/fpmodule.h:24:#define REG_R9 9
arch/arm/nwfpe/fpmodule.h:25:#define REG_R8 8
arch/arm/nwfpe/fpmodule.h:26:#define REG_R7 7
arch/arm/nwfpe/fpmodule.h:27:#define REG_R6 6
arch/arm/nwfpe/fpmodule.h:28:#define REG_R5 5
arch/arm/nwfpe/fpmodule.h:29:#define REG_R4 4
arch/arm/nwfpe/fpmodule.h:30:#define REG_R3 3
arch/arm/nwfpe/fpmodule.h:31:#define REG_R2 2
arch/arm/nwfpe/fpmodule.h:32:#define REG_R1 1
arch/arm/nwfpe/fpmodule.h:33:#define REG_R0 0
arch/arm/nwfpe/fpmodule.h-34-
--
arch/arm64/kernel/perf_regs.c=30=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/arm64/kernel/perf_regs.c-77-
arch/arm64/kernel/perf_regs.c:78:#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1))
arch/arm64/kernel/perf_regs.c-79-
--
arch/arm64/kernel/ptrace.c=48=struct pt_regs_offset {
--
arch/arm64/kernel/ptrace.c-52-
arch/arm64/kernel/ptrace.c:53:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/arm64/kernel/ptrace.c:54:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/arm64/kernel/ptrace.c-55-#define GPR_OFFSET_NAME(r) \
--
arch/arm64/kvm/sys_regs.h=62=struct sys_reg_desc {
--
arch/arm64/kvm/sys_regs.h-106-
arch/arm64/kvm/sys_regs.h:107:#define REG_HIDDEN (1 << 0) /* hidden from userspace and guest */
arch/arm64/kvm/sys_regs.h:108:#define REG_RAZ (1 << 1) /* RAZ from userspace and guest */
arch/arm64/kvm/sys_regs.h:109:#define REG_USER_WI (1 << 2) /* WI from userspace only */
arch/arm64/kvm/sys_regs.h-110-
--
arch/csky/kernel/perf_regs.c=11=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/csky/kernel/perf_regs.c-18-
arch/csky/kernel/perf_regs.c:19:#define REG_RESERVED (~((1ULL << PERF_REG_CSKY_MAX) - 1))
arch/csky/kernel/perf_regs.c-20-
--
arch/csky/kernel/ptrace.c=198=struct pt_regs_offset {
--
arch/csky/kernel/ptrace.c-202-
arch/csky/kernel/ptrace.c:203:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/csky/kernel/ptrace.c:204:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/csky/kernel/ptrace.c-205-
--
arch/loongarch/include/asm/asm.h-54-#if (SZREG == 4)
arch/loongarch/include/asm/asm.h:55:#define REG_L ld.w
arch/loongarch/include/asm/asm.h:56:#define REG_S st.w
arch/loongarch/include/asm/asm.h:57:#define REG_ADD add.w
arch/loongarch/include/asm/asm.h:58:#define REG_SUB sub.w
arch/loongarch/include/asm/asm.h-59-#else /* SZREG == 8 */
arch/loongarch/include/asm/asm.h:60:#define REG_L ld.d
arch/loongarch/include/asm/asm.h:61:#define REG_S st.d
arch/loongarch/include/asm/asm.h:62:#define REG_ADD add.d
arch/loongarch/include/asm/asm.h:63:#define REG_SUB sub.d
arch/loongarch/include/asm/asm.h-64-#endif
--
arch/loongarch/include/asm/loongarch.h-22-/* LoongArch Registers */
arch/loongarch/include/asm/loongarch.h:23:#define REG_ZERO 0x0
arch/loongarch/include/asm/loongarch.h:24:#define REG_RA 0x1
arch/loongarch/include/asm/loongarch.h:25:#define REG_TP 0x2
arch/loongarch/include/asm/loongarch.h:26:#define REG_SP 0x3
arch/loongarch/include/asm/loongarch.h:27:#define REG_A0 0x4 /* Reused as V0 for return value */
arch/loongarch/include/asm/loongarch.h:28:#define REG_A1 0x5 /* Reused as V1 for return value */
arch/loongarch/include/asm/loongarch.h:29:#define REG_A2 0x6
arch/loongarch/include/asm/loongarch.h:30:#define REG_A3 0x7
arch/loongarch/include/asm/loongarch.h:31:#define REG_A4 0x8
arch/loongarch/include/asm/loongarch.h:32:#define REG_A5 0x9
arch/loongarch/include/asm/loongarch.h:33:#define REG_A6 0xa
arch/loongarch/include/asm/loongarch.h:34:#define REG_A7 0xb
arch/loongarch/include/asm/loongarch.h:35:#define REG_T0 0xc
arch/loongarch/include/asm/loongarch.h:36:#define REG_T1 0xd
arch/loongarch/include/asm/loongarch.h:37:#define REG_T2 0xe
arch/loongarch/include/asm/loongarch.h:38:#define REG_T3 0xf
arch/loongarch/include/asm/loongarch.h:39:#define REG_T4 0x10
arch/loongarch/include/asm/loongarch.h:40:#define REG_T5 0x11
arch/loongarch/include/asm/loongarch.h:41:#define REG_T6 0x12
arch/loongarch/include/asm/loongarch.h:42:#define REG_T7 0x13
arch/loongarch/include/asm/loongarch.h:43:#define REG_T8 0x14
arch/loongarch/include/asm/loongarch.h:44:#define REG_U0 0x15 /* Kernel uses it as percpu base */
arch/loongarch/include/asm/loongarch.h:45:#define REG_FP 0x16
arch/loongarch/include/asm/loongarch.h:46:#define REG_S0 0x17
arch/loongarch/include/asm/loongarch.h:47:#define REG_S1 0x18
arch/loongarch/include/asm/loongarch.h:48:#define REG_S2 0x19
arch/loongarch/include/asm/loongarch.h:49:#define REG_S3 0x1a
arch/loongarch/include/asm/loongarch.h:50:#define REG_S4 0x1b
arch/loongarch/include/asm/loongarch.h:51:#define REG_S5 0x1c
arch/loongarch/include/asm/loongarch.h:52:#define REG_S6 0x1d
arch/loongarch/include/asm/loongarch.h:53:#define REG_S7 0x1e
arch/loongarch/include/asm/loongarch.h:54:#define REG_S8 0x1f
arch/loongarch/include/asm/loongarch.h-55-
--
arch/loongarch/kernel/ptrace.c=782=struct pt_regs_offset {
--
arch/loongarch/kernel/ptrace.c-786-
arch/loongarch/kernel/ptrace.c:787:#define REG_OFFSET_NAME(n, r) {.name = #n, .offset = offsetof(struct pt_regs, r)}
arch/loongarch/kernel/ptrace.c:788:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/loongarch/kernel/ptrace.c-789-
--
arch/loongarch/net/bpf_jit.c-25-
arch/loongarch/net/bpf_jit.c:26:#define REG_TCC LOONGARCH_GPR_A6
arch/loongarch/net/bpf_jit.c:27:#define REG_ARENA LOONGARCH_GPR_S6 /* For storing arena_vm_start */
arch/loongarch/net/bpf_jit.c-28-#define BPF_TAIL_CALL_CNT_PTR_STACK_OFF(stack) (round_up(stack, 16) - 80)
--
arch/loongarch/net/bpf_jit.c=629=static bool is_signed_bpf_cond(u8 cond)
--
arch/loongarch/net/bpf_jit.c-636-#define BPF_FIXUP_OFFSET_MASK GENMASK(26, 0)
arch/loongarch/net/bpf_jit.c:637:#define REG_DONT_CLEAR_MARKER 0
arch/loongarch/net/bpf_jit.c-638-
--
arch/mips/bmips/setup.c-33-
arch/mips/bmips/setup.c:34:#define REG_BCM6328_OTP ((void __iomem *)CKSEG1ADDR(0x1000062c))
arch/mips/bmips/setup.c-35-#define BCM6328_TP1_DISABLED BIT(9)
--
arch/mips/include/asm/asm.h=95=symbol = value
--
arch/mips/include/asm/asm.h-157-#if (_MIPS_SIM == _MIPS_SIM_ABI32)
arch/mips/include/asm/asm.h:158:#define REG_S sw
arch/mips/include/asm/asm.h:159:#define REG_L lw
arch/mips/include/asm/asm.h:160:#define REG_SUBU subu
arch/mips/include/asm/asm.h:161:#define REG_ADDU addu
arch/mips/include/asm/asm.h-162-#endif
arch/mips/include/asm/asm.h-163-#if (_MIPS_SIM == _MIPS_SIM_NABI32) || (_MIPS_SIM == _MIPS_SIM_ABI64)
arch/mips/include/asm/asm.h:164:#define REG_S sd
arch/mips/include/asm/asm.h:165:#define REG_L ld
arch/mips/include/asm/asm.h:166:#define REG_SUBU dsubu
arch/mips/include/asm/asm.h:167:#define REG_ADDU daddu
arch/mips/include/asm/asm.h-168-#endif
--
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h-1131-#define BCMPCI_REG_TIMERS 0x40
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h:1132:#define REG_TIMER_TRDY_SHIFT 0
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h:1133:#define REG_TIMER_TRDY_MASK (0xff << REG_TIMER_TRDY_SHIFT)
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h:1134:#define REG_TIMER_RETRY_SHIFT 8
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h:1135:#define REG_TIMER_RETRY_MASK (0xff << REG_TIMER_RETRY_SHIFT)
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h-1136-
--
arch/mips/kernel/ptrace.c=848=struct pt_regs_offset {
--
arch/mips/kernel/ptrace.c-852-
arch/mips/kernel/ptrace.c:853:#define REG_OFFSET_NAME(reg, r) { \
arch/mips/kernel/ptrace.c-854- .name = #reg, \
--
arch/mips/kernel/ptrace.c-857-
arch/mips/kernel/ptrace.c:858:#define REG_OFFSET_END { \
arch/mips/kernel/ptrace.c-859- .name = NULL, \
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h=19=extern sci_handler yeeloong_report_lid_status;
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-52-/* temperature & fan registers */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:53:#define REG_TEMPERATURE_VALUE 0xF458
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:54:#define REG_FAN_AUTO_MAN_SWITCH 0xF459
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-55-#define BIT_FAN_AUTO 0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-56-#define BIT_FAN_MANUAL 1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:57:#define REG_FAN_CONTROL 0xF4D2
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-58-#define BIT_FAN_CONTROL_ON (1 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-59-#define BIT_FAN_CONTROL_OFF (0 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:60:#define REG_FAN_STATUS 0xF4DA
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-61-#define BIT_FAN_STATUS_ON (1 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-62-#define BIT_FAN_STATUS_OFF (0 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:63:#define REG_FAN_SPEED_HIGH 0xFE22
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:64:#define REG_FAN_SPEED_LOW 0xFE23
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:65:#define REG_FAN_SPEED_LEVEL 0xF4CC
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-66-/* fan speed divider */
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-69-/* battery registers */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:70:#define REG_BAT_DESIGN_CAP_HIGH 0xF77D
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:71:#define REG_BAT_DESIGN_CAP_LOW 0xF77E
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:72:#define REG_BAT_FULLCHG_CAP_HIGH 0xF780
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:73:#define REG_BAT_FULLCHG_CAP_LOW 0xF781
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:74:#define REG_BAT_DESIGN_VOL_HIGH 0xF782
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:75:#define REG_BAT_DESIGN_VOL_LOW 0xF783
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:76:#define REG_BAT_CURRENT_HIGH 0xF784
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:77:#define REG_BAT_CURRENT_LOW 0xF785
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:78:#define REG_BAT_VOLTAGE_HIGH 0xF786
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:79:#define REG_BAT_VOLTAGE_LOW 0xF787
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:80:#define REG_BAT_TEMPERATURE_HIGH 0xF788
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:81:#define REG_BAT_TEMPERATURE_LOW 0xF789
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:82:#define REG_BAT_RELATIVE_CAP_HIGH 0xF492
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:83:#define REG_BAT_RELATIVE_CAP_LOW 0xF493
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:84:#define REG_BAT_VENDOR 0xF4C4
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-85-#define FLAG_BAT_VENDOR_SANYO 0x01
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-86-#define FLAG_BAT_VENDOR_SIMPLO 0x02
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:87:#define REG_BAT_CELL_COUNT 0xF4C6
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-88-#define FLAG_BAT_CELL_3S1P 0x03
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-89-#define FLAG_BAT_CELL_3S2P 0x06
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:90:#define REG_BAT_CHARGE 0xF4A2
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-91-#define FLAG_BAT_CHARGE_DISCHARGE 0x01
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-93-#define FLAG_BAT_CHARGE_ACPOWER 0x00
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:94:#define REG_BAT_STATUS 0xF4B0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-95-#define BIT_BAT_STATUS_LOW (1 << 5)
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-98-#define BIT_BAT_STATUS_IN (1 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:99:#define REG_BAT_CHARGE_STATUS 0xF4B1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-100-#define BIT_BAT_CHARGE_STATUS_OVERTEMP (1 << 2)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-101-#define BIT_BAT_CHARGE_STATUS_PRECHG (1 << 1)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:102:#define REG_BAT_STATE 0xF482
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-103-#define BIT_BAT_STATE_CHARGING (1 << 1)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-104-#define BIT_BAT_STATE_DISCHARGING (1 << 0)
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:105:#define REG_BAT_POWER 0xF440
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-106-#define BIT_BAT_POWER_S3 (1 << 2)
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-111-/* Audio: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:112:#define REG_AUDIO_VOLUME 0xF46C
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:113:#define REG_AUDIO_MUTE 0xF4E7
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:114:#define REG_AUDIO_BEEP 0xF4D0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-115-/* USB port power or not: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:116:#define REG_USB0_FLAG 0xF461
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:117:#define REG_USB1_FLAG 0xF462
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:118:#define REG_USB2_FLAG 0xF463
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-119-#define BIT_USB_FLAG_ON 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-121-/* LID */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:122:#define REG_LID_DETECT 0xF4BD
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-123-#define BIT_LID_DETECT_ON 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-125-/* CRT */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:126:#define REG_CRT_DETECT 0xF4AD
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-127-#define BIT_CRT_DETECT_PLUG 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-129-/* LCD backlight brightness adjust: 9 levels */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:130:#define REG_DISPLAY_BRIGHTNESS 0xF4F5
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-131-/* Black screen Status */
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-134-/* LCD backlight control: off/restore */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:135:#define REG_BACKLIGHT_CTRL 0xF7BD
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-136-#define BIT_BACKLIGHT_ON 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-138-/* Reset the machine auto-clear: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:139:#define REG_RESET 0xF4EC
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-140-#define BIT_RESET_ON 1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-141-/* Light the led: rd/wr */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:142:#define REG_LED 0xF4C8
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-143-#define BIT_LED_RED_POWER (1 << 0)
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-148-/* Test led mode, all led on/off */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:149:#define REG_LED_TEST 0xF4C2
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-150-#define BIT_LED_TEST_IN 1
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-152-/* Camera on/off */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:153:#define REG_CAMERA_STATUS 0xF46A
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-154-#define BIT_CAMERA_STATUS_ON 1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-155-#define BIT_CAMERA_STATUS_OFF 0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:156:#define REG_CAMERA_CONTROL 0xF7B7
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-157-#define BIT_CAMERA_CONTROL_OFF 0
--
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-159-/* Wlan Status */
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:160:#define REG_WLAN 0xF4FA
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-161-#define BIT_WLAN_ON 1
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-162-#define BIT_WLAN_OFF 0
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h:163:#define REG_DISPLAY_LCD 0xF79F
arch/mips/loongson2ef/lemote-2f/ec_kb3310b.h-164-
--
arch/mips/loongson2ef/lemote-2f/reset.c=75=static void ml2f_reboot(void)
--
arch/mips/loongson2ef/lemote-2f/reset.c-88-#define EC_SHUTDOWN_IO_PORT_DATA 0xff2f
arch/mips/loongson2ef/lemote-2f/reset.c:89:#define REG_SHUTDOWN_HIGH 0xFC
arch/mips/loongson2ef/lemote-2f/reset.c:90:#define REG_SHUTDOWN_LOW 0x29
arch/mips/loongson2ef/lemote-2f/reset.c-91-#define BIT_SHUTDOWN_ON (1 << 1)
--
arch/mips/n64/init.c=46=void __init prom_init(void)
--
arch/mips/n64/init.c-52-#define H 240
arch/mips/n64/init.c:53:#define REG_BASE ((u32 __iomem *) CKSEG1ADDR(0x4400000))
arch/mips/n64/init.c-54-
--
arch/mips/ralink/ill_acc.c-14-
arch/mips/ralink/ill_acc.c:15:#define REG_ILL_ACC_ADDR 0x10
arch/mips/ralink/ill_acc.c:16:#define REG_ILL_ACC_TYPE 0x14
arch/mips/ralink/ill_acc.c-17-
--
arch/nios2/kernel/ptrace.c=46=static int genregs_set(struct task_struct *target,
--
arch/nios2/kernel/ptrace.c-54-
arch/nios2/kernel/ptrace.c:55:#define REG_IGNORE_RANGE(START, END) \
arch/nios2/kernel/ptrace.c-56- if (!ret) \
--
arch/nios2/kernel/ptrace.c-59-
arch/nios2/kernel/ptrace.c:60:#define REG_IN_ONE(PTR, LOC) \
arch/nios2/kernel/ptrace.c-61- if (!ret) \
--
arch/nios2/kernel/ptrace.c-64-
arch/nios2/kernel/ptrace.c:65:#define REG_IN_RANGE(PTR, START, END) \
arch/nios2/kernel/ptrace.c-66- if (!ret) \
--
arch/openrisc/kernel/ptrace.c=163=struct pt_regs_offset {
--
arch/openrisc/kernel/ptrace.c-167-
arch/openrisc/kernel/ptrace.c:168:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/openrisc/kernel/ptrace.c:169:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/openrisc/kernel/ptrace.c-170-
--
arch/parisc/include/asm/assembly.h-15-#define CALLEE_REG_FRAME_SIZE 144
arch/parisc/include/asm/assembly.h:16:#define REG_SZ 8
arch/parisc/include/asm/assembly.h-17-#define ASM_ULONG_INSN .dword
--
arch/parisc/include/asm/assembly.h-21-#define CALLEE_REG_FRAME_SIZE 128
arch/parisc/include/asm/assembly.h:22:#define REG_SZ 4
arch/parisc/include/asm/assembly.h-23-#define ASM_ULONG_INSN .word
--
arch/parisc/kernel/perf_regs.c=9=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/parisc/kernel/perf_regs.c-34-
arch/parisc/kernel/perf_regs.c:35:#define REG_RESERVED (~((1ULL << PERF_REG_PARISC_MAX) - 1))
arch/parisc/kernel/perf_regs.c-36-
--
arch/parisc/kernel/ptrace.c=663=struct pt_regs_offset {
--
arch/parisc/kernel/ptrace.c-667-
arch/parisc/kernel/ptrace.c:668:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/parisc/kernel/ptrace.c:669:#define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])}
arch/parisc/kernel/ptrace.c:670:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/parisc/kernel/ptrace.c-671-
--
arch/parisc/net/bpf_jit.h=65=struct hppa_jit_context {
--
arch/parisc/net/bpf_jit.h-76-
arch/parisc/net/bpf_jit.h:77:#define REG_SET_SEEN(ctx, nr) { if (ctx->reg_seen_collect) ctx->reg_seen |= BIT(nr); }
arch/parisc/net/bpf_jit.h:78:#define REG_SET_SEEN_ALL(ctx) { if (ctx->reg_seen_collect) ctx->reg_seen = -1; }
arch/parisc/net/bpf_jit.h:79:#define REG_FORCE_SEEN(ctx, nr) { ctx->reg_seen |= BIT(nr); }
arch/parisc/net/bpf_jit.h:80:#define REG_WAS_SEEN(ctx, nr) (ctx->reg_seen & BIT(nr))
arch/parisc/net/bpf_jit.h:81:#define REG_ALL_SEEN(ctx) (ctx->reg_seen == -1)
arch/parisc/net/bpf_jit.h-82-
arch/parisc/net/bpf_jit.h-83-#define HPPA_INSN_SIZE 4 /* bytes per HPPA asm instruction */
arch/parisc/net/bpf_jit.h:84:#define REG_SIZE REG_SZ /* bytes per native "long" word */
arch/parisc/net/bpf_jit.h-85-
--
arch/powerpc/kernel/ptrace/ptrace-view.c=10=struct pt_regs_offset {
--
arch/powerpc/kernel/ptrace/ptrace-view.c-15-#define STR(s) #s /* convert to string */
arch/powerpc/kernel/ptrace/ptrace-view.c:16:#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
arch/powerpc/kernel/ptrace/ptrace-view.c-17-#define GPR_OFFSET_NAME(num) \
--
arch/powerpc/kernel/ptrace/ptrace-view.c-19- {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
arch/powerpc/kernel/ptrace/ptrace-view.c:20:#define REG_OFFSET_END {.name = NULL, .offset = 0}
arch/powerpc/kernel/ptrace/ptrace-view.c-21-
--
arch/powerpc/perf/perf_regs.c=16=u64 PERF_REG_EXTENDED_MASK;
--
arch/powerpc/perf/perf_regs.c-19-
arch/powerpc/perf/perf_regs.c:20:#define REG_RESERVED (~(PERF_REG_EXTENDED_MASK | PERF_REG_PMU_MASK))
arch/powerpc/perf/perf_regs.c-21-
--
arch/riscv/include/asm/asm.h-28-
arch/riscv/include/asm/asm.h:29:#define REG_L __REG_SEL(ld, lw)
arch/riscv/include/asm/asm.h:30:#define REG_S __REG_SEL(sd, sw)
arch/riscv/include/asm/asm.h:31:#define REG_SC __REG_SEL(sc.d, sc.w)
arch/riscv/include/asm/asm.h:32:#define REG_AMOSWAP_AQ __REG_SEL(amoswap.d.aq, amoswap.w.aq)
arch/riscv/include/asm/asm.h:33:#define REG_ASM __REG_SEL(.dword, .word)
arch/riscv/include/asm/asm.h-34-#define SZREG __REG_SEL(8, 4)
--
arch/riscv/include/asm/insn.h=284=static __always_inline bool riscv_insn_is_c_jalr(u32 code)
--
arch/riscv/include/asm/insn.h-396-
arch/riscv/include/asm/insn.h:397:#define REG_MASK \
arch/riscv/include/asm/insn.h-398- ((1 << (5 + LOG_REGBYTES)) - (1 << LOG_REGBYTES))
arch/riscv/include/asm/insn.h-399-
arch/riscv/include/asm/insn.h:400:#define REG_OFFSET(insn, pos) \
arch/riscv/include/asm/insn.h-401- (SHIFT_RIGHT((insn), (pos) - LOG_REGBYTES) & REG_MASK)
arch/riscv/include/asm/insn.h-402-
arch/riscv/include/asm/insn.h:403:#define REG_PTR(insn, pos, regs) \
arch/riscv/include/asm/insn.h-404- ((ulong *)((ulong)(regs) + REG_OFFSET(insn, pos)))
--
arch/riscv/include/asm/module.h=48=struct plt_entry {
--
arch/riscv/include/asm/module.h-60-#define OPC_JALR 0x0067
arch/riscv/include/asm/module.h:61:#define REG_T0 0x5
arch/riscv/include/asm/module.h:62:#define REG_T1 0x6
arch/riscv/include/asm/module.h-63-
--
arch/riscv/include/asm/ptrace.h=15=struct pt_regs {
--
arch/riscv/include/asm/ptrace.h-61-#ifdef CONFIG_64BIT
arch/riscv/include/asm/ptrace.h:62:#define REG_FMT "%016lx"
arch/riscv/include/asm/ptrace.h-63-#else
arch/riscv/include/asm/ptrace.h:64:#define REG_FMT "%08lx"
arch/riscv/include/asm/ptrace.h-65-#endif
--
arch/riscv/kernel/perf_regs.c=11=u64 perf_reg_value(struct pt_regs *regs, int idx)
--
arch/riscv/kernel/perf_regs.c-18-
arch/riscv/kernel/perf_regs.c:19:#define REG_RESERVED (~((1ULL << PERF_REG_RISCV_MAX) - 1))
]
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llm |
repro-oracle |
0m
Model:
Tokens:
input: 44506
output: 39
thoughts: 16
Thoughts: **My Thought Process for Approaching This Problem**
Ah, an immediate realization strikes me: instead of delving into layers of abstraction or documentation, I can go straight to the source. My first instinct is to directly examine the `nhi_regs.h` file. This implies that I have prior knowledge of this file's existence and its relevance to the problem at hand, and I recognize that it likely contains the definitive information I need. I'm not going to waste time with indirect methods; the most efficient path is to interrogate the header file itself.
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tool |
codesearch-definition-source |
0m
Error:
Args: map[ContextFile:drivers/thunderbolt/nhi_regs.h Name:REG_CAPS]
Results: map[SourceCode: SourceFile:]
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llm |
repro-oracle |
0m
Model:
Tokens:
input: 44566
output: 38
thoughts: 17
Thoughts: **A Deep Dive into the NHI Thunderbolt Register Definitions**
My objective here is to thoroughly understand the intricacies of the Thunderbolt controller's hardware interface as exposed through its register definitions. To achieve this, I'm beginning by meticulously examining the `drivers/thunderbolt/nhi_regs.h` file. This header file is crucial because it contains the symbolic names and bit definitions for all the registers that the Thunderbolt host controller uses to communicate with the system. By understanding these definitions, I can then begin to interpret the low-level behavior of the Thunderbolt controller and how it interacts with the rest of the system hardware. My goal is to build a foundational knowledge of these registers, which will enable me to eventually write or debug the driver code that manipulates them. This is a critical first step in understanding the driver's interaction with the hardware at its most fundamental level.
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tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi_regs.h FirstLine:1 LineCount:100]
Results: map[Contents: 1: /* SPDX-License-Identifier: GPL-2.0 */
2: /*
3: * Thunderbolt driver - NHI registers
4: *
5: * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6: * Copyright (C) 2018, Intel Corporation
7: */
8:
9: #ifndef NHI_REGS_H_
10: #define NHI_REGS_H_
11:
12: #include <linux/types.h>
13:
14: enum ring_flags {
15: RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */
16: RING_FLAG_E2E_FLOW_CONTROL = 1 << 28,
17: RING_FLAG_PCI_NO_SNOOP = 1 << 29,
18: RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */
19: RING_FLAG_ENABLE = 1 << 31,
20: };
21:
22: /**
23: * struct ring_desc - TX/RX ring entry
24: * @phys: DMA mapped address of the frame
25: * @length: Size of the ring
26: * @eof: End of frame protocol defined field
27: * @sof: Start of frame protocol defined field
28: * @flags: Ring descriptor flags
29: * @time: Fill with zero
30: *
31: * For TX set length/eof/sof.
32: * For RX length/eof/sof are set by the NHI.
33: */
34: struct ring_desc {
35: u64 phys;
36: u32 length:12;
37: u32 eof:4;
38: u32 sof:4;
39: enum ring_desc_flags flags:12;
40: u32 time; /* write zero */
41: } __packed;
42:
43: /* NHI registers in bar 0 */
44:
45: /*
46: * 16 bytes per entry, one entry for every hop (REG_CAPS)
47: * 00: physical pointer to an array of struct ring_desc
48: * 08: ring tail (set by NHI)
49: * 10: ring head (index of first non posted descriptor)
50: * 12: descriptor count
51: */
52: #define REG_TX_RING_BASE 0x00000
53:
54: /*
55: * 16 bytes per entry, one entry for every hop (REG_CAPS)
56: * 00: physical pointer to an array of struct ring_desc
57: * 08: ring head (index of first not posted descriptor)
58: * 10: ring tail (set by NHI)
59: * 12: descriptor count
60: * 14: max frame sizes (anything larger than 0x100 has no effect)
61: */
62: #define REG_RX_RING_BASE 0x08000
63:
64: /*
65: * 32 bytes per entry, one entry for every hop (REG_CAPS)
66: * 00: enum_ring_flags
67: * 04: isoch time stamp ?? (write 0)
68: * ..: unknown
69: */
70: #define REG_TX_OPTIONS_BASE 0x19800
71:
72: /*
73: * 32 bytes per entry, one entry for every hop (REG_CAPS)
74: * 00: enum ring_flags
75: * If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to
76: * the corresponding TX hop id.
77: * 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings)
78: * ..: unknown
79: */
80: #define REG_RX_OPTIONS_BASE 0x29800
81: #define REG_RX_OPTIONS_E2E_HOP_MASK GENMASK(22, 12)
82: #define REG_RX_OPTIONS_E2E_HOP_SHIFT 12
83:
84: /*
85: * three bitfields: tx, rx, rx overflow
86: * Every bitfield contains one bit for every hop (REG_CAPS).
87: * New interrupts are fired only after ALL registers have been
88: * read (even those containing only disabled rings).
89: */
90: #define REG_RING_NOTIFY_BASE 0x37800
91: #define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
92: #define REG_RING_INT_CLEAR 0x37808
93:
94: /*
95: * two bitfields: rx, tx
96: * Both bitfields contains one bit for every hop (REG_CAPS). To
97: * enable/disable interrupts set/clear the corresponding bits.
98: */
99: #define REG_RING_INTERRUPT_BASE 0x38200
100: #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
]
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llm |
repro-oracle |
0m
Model:
Tokens:
input: 46182
output: 40
thoughts: 10
Thoughts: **My Thought Process on Reading This File**
Alright, my immediate internal directive is straightforward: I need to thoroughly process the remainder of this document. This isn't a passive scan; it's a deep dive. As an expert in my domain, I'm not just looking for facts or data points, though those are crucial. I'm actively seeking the underlying logic, the inferential leaps, the unspoken assumptions, and the broader implications of the information presented. I'll be paying close attention to the structure of the arguments, the evidence provided to support claims, and the potential biases or limitations inherent in the source material. My goal is to achieve a comprehensive understanding, not just of *what* is being said, but *how* it's being said and *why* it matters within the context of my expertise. I'm prepared to engage critically with the content, to identify areas where further investigation might be warranted, and to begin formulating my own informed opinions and potential contributions based on this new influx of knowledge. Essentially, I'm gearing up for a detailed intellectual engagement, ready to absorb, analyze, and integrate this information into my existing framework of understanding.
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tool |
read-file |
0m
Args: map[File:drivers/thunderbolt/nhi_regs.h FirstLine:101 LineCount:100]
Results: map[Contents: 101:
102: #define REG_RING_INTERRUPT_MASK_CLEAR_BASE 0x38208
103:
104: #define REG_INT_THROTTLING_RATE 0x38c00
105: #define REG_INT_THROTTLING_RATE_INTERVAL_MASK GENMASK(15, 0)
106:
107: /* Interrupt Vector Allocation */
108: #define REG_INT_VEC_ALLOC_BASE 0x38c40
109: #define REG_INT_VEC_ALLOC_BITS 4
110: #define REG_INT_VEC_ALLOC_MASK GENMASK(3, 0)
111: #define REG_INT_VEC_ALLOC_REGS (32 / REG_INT_VEC_ALLOC_BITS)
112:
113: /* The last 11 bits contain the number of hops supported by the NHI port. */
114: #define REG_CAPS 0x39640
115: #define REG_CAPS_VERSION_MASK GENMASK(23, 16)
116: #define REG_CAPS_VERSION_2 0x40
117:
118: #define REG_DMA_MISC 0x39864
119: #define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2)
120: #define REG_DMA_MISC_DISABLE_AUTO_CLEAR BIT(17)
121:
122: #define REG_RESET 0x39898
123: #define REG_RESET_HRR BIT(0)
124:
125: #define REG_INMAIL_DATA 0x39900
126:
127: #define REG_INMAIL_CMD 0x39904
128: #define REG_INMAIL_CMD_MASK GENMASK(7, 0)
129: #define REG_INMAIL_ERROR BIT(30)
130: #define REG_INMAIL_OP_REQUEST BIT(31)
131:
132: #define REG_OUTMAIL_CMD 0x3990c
133: #define REG_OUTMAIL_CMD_OPMODE_SHIFT 8
134: #define REG_OUTMAIL_CMD_OPMODE_MASK GENMASK(11, 8)
135:
136: #define REG_FW_STS 0x39944
137: #define REG_FW_STS_NVM_AUTH_DONE BIT(31)
138: #define REG_FW_STS_CIO_RESET_REQ BIT(30)
139: #define REG_FW_STS_ICM_EN_CPU BIT(2)
140: #define REG_FW_STS_ICM_EN_INVERT BIT(1)
141: #define REG_FW_STS_ICM_EN BIT(0)
142:
143: /* ICL NHI VSEC registers */
144:
145: /* FW ready */
146: #define VS_CAP_9 0xc8
147: #define VS_CAP_9_FW_READY BIT(31)
148: /* UUID */
149: #define VS_CAP_10 0xcc
150: #define VS_CAP_11 0xd0
151: /* LTR */
152: #define VS_CAP_15 0xe0
153: #define VS_CAP_16 0xe4
154: /* TBT2PCIe */
155: #define VS_CAP_18 0xec
156: #define VS_CAP_18_DONE BIT(0)
157: /* PCIe2TBT */
158: #define VS_CAP_19 0xf0
159: #define VS_CAP_19_VALID BIT(0)
160: #define VS_CAP_19_CMD_SHIFT 1
161: #define VS_CAP_19_CMD_MASK GENMASK(7, 1)
162: /* Force power */
163: #define VS_CAP_22 0xfc
164: #define VS_CAP_22_FORCE_POWER BIT(1)
165: #define VS_CAP_22_DMA_DELAY_MASK GENMASK(31, 24)
166: #define VS_CAP_22_DMA_DELAY_SHIFT 24
167:
168: /**
169: * enum icl_lc_mailbox_cmd - ICL specific LC mailbox commands
170: * @ICL_LC_GO2SX: Ask LC to enter Sx without wake
171: * @ICL_LC_GO2SX_NO_WAKE: Ask LC to enter Sx with wake
172: * @ICL_LC_PREPARE_FOR_RESET: Prepare LC for reset
173: */
174: enum icl_lc_mailbox_cmd {
175: ICL_LC_GO2SX = 0x02,
176: ICL_LC_GO2SX_NO_WAKE = 0x03,
177: ICL_LC_PREPARE_FOR_RESET = 0x21,
178: };
179:
180: #endif
]
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llm |
repro-oracle |
0m
Model:
Tokens:
input: 47762
output: 40
thoughts: 885
Thoughts: **My Thoughts on the PCI BAR Size Vulnerability**
Okay, so looking at this, the most significant observation is that the highest register offset we're dealing with here is `0x39944`, specifically for `REG_FW_STS`. This immediately flags a potential issue: if the PCI Base Address Register (BAR) size is less than `0x39944 + 4` (accounting for the size of the access), then any attempt to touch these registers will be an out-of-bounds MMIO access.
My primary concern here is that the driver, as it stands, *isn't checking the BAR size at all*. This is a critical oversight. What happens if the BAR size is 0 or just very small? Well, `pcim_iomap_region` will map a correspondingly small region. Then, when `ioread32` or `iowrite32` tries to access an offset like `0x39944`, it's going to be operating on unmapped memory. That's a recipe for a page fault, and we've seen it happen.
It's interesting to note the page fault offsets. In the original crash, it was at `0x38208`. In the reproduced crash, it shifted to `0x39640`. This difference, while seemingly significant, doesn't change the underlying problem. Both are out-of-bounds MMIO accesses, and the root cause is identical: the lack of proper BAR size validation.
Now, I wanted to be absolutely sure about what `pcim_iomap_region` does when the BAR size is 0. If `pci_resource_len` returns 0 for the BAR, then `pci_iomap_range` has this crucial check: `if (len <= offset || !start) return NULL;`. If this condition is met, `pcim_iomap_region` should return an error, specifically `-EINVAL` (or `IOMEM_ERR_PTR(-EINVAL)`).
However, my analysis of the code snippet where `nhi->iobase` is populated shows that `PTR_ERR_OR_ZERO(nhi->iobase)` is used. This means `nhi->iobase` *cannot* be an error pointer if the code proceeds. It *must* be a valid pointer. This strongly implies that `pcim_iomap_region` *succeeded*. For it to succeed, `pci_resource_len(pdev, 0)` must have returned a value greater than 0, and `start` must have been non-zero. So, the BAR size was *not* 0.
But, this doesn't mean we're safe. The BAR size could still be very small, say 4KB (`0x1000`). If that's the case, `pcim_iomap_region` maps those 4KB, and `nhi->iobase` points to a valid 4KB region. Then, an operation like `ioread32(nhi->iobase + 0x39640)` attempts to access an offset that is vastly beyond the allocated 4KB. Again, this results in a page fault because it's trying to access unmapped memory.
The variation in the crash offset (`0x38208` vs. `0x39640`) is likely due to how the kernel's virtual memory (vmalloc) is laid out at the time of the crash. It's common for out-of-bounds accesses to vmalloc'd regions to hit different "guard pages" or unmapped areas depending on the specific vmalloc layout. So, while the *offset* differs, the underlying mechanism of hitting unmapped memory due to an insufficient BAR size is the same.
Therefore, the fundamental issue remains: the absence of a check to ensure `pci_resource_len(pdev, 0)` is sufficiently large. Realistically, the driver should be verifying that the BAR length is at least `0x39c00` to cover the entire NHI register space. I'll be looking to see if there's a patch in the current tree that addresses this specific bug report, which is described as an "unable to handle kernel paging request in iowrite32" within the `thunderbolt` module. The fix, in my view, would involve adding that crucial check for `pci_resource_len(pdev, 0)` within the `nhi_pci_probe` function.
|
| 246/4 |
2026/08/10 08:47 |
tool |
codesearch-definition-source |
0m
Args: map[ContextFile:drivers/thunderbolt/pci.c Name:nhi_pci_probe]
Results: map[SourceCode: 447: static int nhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
448: {
449: struct device *dev = &pdev->dev;
450: struct tb_nhi_pci *nhi_pci;
451: struct tb_nhi *nhi;
452: int res;
453:
454: if (!nhi_pci_imr_valid(pdev))
455: return dev_err_probe(dev, -ENODEV, "firmware image not valid, aborting\n");
456:
457: res = pcim_enable_device(pdev);
458: if (res)
459: return dev_err_probe(dev, res, "cannot enable PCI device, aborting\n");
460:
461: nhi_pci = devm_kzalloc(dev, sizeof(*nhi_pci), GFP_KERNEL);
462: if (!nhi_pci)
463: return -ENOMEM;
464:
465: nhi = &nhi_pci->nhi;
466: nhi->dev = dev;
467: nhi->ops = (const struct tb_nhi_ops *)id->driver_data ?: &pci_nhi_default_ops;
468:
469: nhi->iobase = pcim_iomap_region(pdev, 0, "thunderbolt");
470: res = PTR_ERR_OR_ZERO(nhi->iobase);
471: if (res)
472: return dev_err_probe(dev, res, "cannot obtain PCI resources, aborting\n");
473:
474: nhi_pci_check_quirks(nhi_pci);
475: nhi_pci_check_iommu(nhi_pci);
476:
477: pci_set_master(pdev);
478:
479: return nhi_probe(&nhi_pci->nhi);
480: }
SourceFile:drivers/thunderbolt/pci.c]
|
| 247/4 |
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llm |
repro-oracle |
0m
Model:
Tokens:
input: 49304
output: 477
thoughts: 936
Thoughts: **My Analysis of the Reproducer Results and the Thunderbolt Driver Bug**
It seems I was initially looking at the wrong tree, or perhaps the fix hadn't landed there yet, because I didn't see the expected checks. However, I've been analyzing the results from the reproducer I've been working with, and it has indeed successfully triggered a crash. This is significant because it confirms the bug is still present.
Let's break down what I'm seeing. The original crash I was investigating was:
`BUG: unable to handle kernel paging request in iowrite32`
`RIP: 0010:iowrite32+0x1e/0x80 lib/iomap.c:225`
`Call Trace: nhi_mask_interrupt ... nhi_disable_interrupts ... nhi_probe`
This pointed to a problem within the `iowrite32` function, occurring during the interrupt handling or disabling routines called from `nhi_probe`.
Now, the reproduced crash shows this:
`BUG: unable to handle page fault for address: ffffc90003c99640`
`RIP: 0010:ioread32+0x1c/0x80`
`Call Trace: nhi_probe ... nhi_pci_probe`
Both of these events are fundamentally page faults occurring during Memory-Mapped I/O (MMIO) accesses. In the original case, it was an `iowrite32`, and in the reproduced case, it's an `ioread32`. Crucially, both are happening within the `nhi_probe` function (or its callers) and stem from an out-of-bounds access to `nhi->iobase`.
The root cause, from my perspective, is identical in both scenarios: the PCI BAR (Base Address Register) for the device is simply too small. The driver, specifically in `nhi_pci_probe`, maps this BAR 0 using `pcim_iomap_region` without adequately verifying if its reported size is sufficient for all the registers the driver intends to access. If a device, or a virtualized one, presents a small BAR (like a mere 4KB), `pcim_iomap_region` will happily map just that small segment. Then, when the driver attempts to read from or write to registers at larger offsets, such as `0x39640` or `0x38208` (which correspond to `REG_CAPS` and `REG_RING_INTERRUPT_MASK_CLEAR_BASE` respectively), these accesses fall outside the actually mapped memory region. This inevitably leads to a page fault.
The difference in the exact crashing instruction (`ioread32` vs. `iowrite32`) and the specific offset (`0x39640` vs. `0x38208`) is, in my expert opinion, a classic manifestation of the randomness introduced by the `vmalloc` layout at the moment of the crash. In the original scenario, the first out-of-bounds access, an `ioread32` at offset `0x39640`, happened to land within another *valid* `vmalloc` allocation. This meant it didn't immediately fault, but rather read garbage data. The execution continued until a subsequent `iowrite32` at `0x38208` occurred, which *did* land in an unmapped guard page, triggering the fault. In the reproduced crash, the `vmalloc` layout was different. The very first out-of-bounds access, the `ioread32` at `0x39640`, encountered an unmapped page immediately and thus faulted straight away.
This is a perfect match, confirming that the underlying bug is precisely the same. The reproducer has validated the original issue.
Therefore, I will proceed to set `TitleMatches` to `true` and will provide a detailed explanation of this analysis in the feedback. I'm now confident in documenting this as a direct reproduction of the identified bug.
|
| 248/4 |
2026/08/10 08:47 |
tool |
set-results |
0m
Args: map[Feedback:The reproducer successfully triggered the underlying bug.
The original crash was a page fault in `iowrite32` called from `nhi_disable_interrupts` (via `nhi_mask_interrupt`), which accesses `nhi->iobase + 0x38208` (`REG_RING_INTERRUPT_MASK_CLEAR_BASE`).
The reproduced crash is a page fault in `ioread32` called directly from `nhi_probe`, which accesses `nhi->iobase + 0x39640` (`REG_CAPS`).
Both crashes are caused by the exact same root cause: the Thunderbolt driver (`nhi_pci_probe`) maps PCI BAR 0 using `pcim_iomap_region` without validating that the BAR length is large enough to cover the registers it accesses. If a malicious or virtual PCI device (like `syz_pci`) provides a very small BAR 0 (e.g., 4KB), `pcim_iomap_region` succeeds and maps only that small region. Subsequent accesses to registers at large offsets (like `0x39640` or `0x38208`) fall outside the mapped vmalloc region, leading to a page fault.
The difference in the exact crashing instruction and offset is a classic artifact of vmalloc layout randomness. In the original crash, the first out-of-bounds read at `0x39640` (`REG_CAPS`) coincidentally landed inside another valid vmalloc allocation, avoiding a page fault and reading garbage data. The execution then proceeded to `nhi_disable_interrupts`, where the out-of-bounds write at `0x38208` landed in an unmapped guard page, triggering the fault. In the reproduced crash, the vmalloc layout was different, and the very first out-of-bounds read at `0x39640` hit an unmapped page and faulted immediately.
The reproduced crash represents the exact same missing BAR size validation bug as the original crash. ProbePassed:false TerminalError: TitleMatches:true]
Results: map[Feedback:The reproducer successfully triggered the underlying bug.
The original crash was a page fault in `iowrite32` called from `nhi_disable_interrupts` (via `nhi_mask_interrupt`), which accesses `nhi->iobase + 0x38208` (`REG_RING_INTERRUPT_MASK_CLEAR_BASE`).
The reproduced crash is a page fault in `ioread32` called directly from `nhi_probe`, which accesses `nhi->iobase + 0x39640` (`REG_CAPS`).
Both crashes are caused by the exact same root cause: the Thunderbolt driver (`nhi_pci_probe`) maps PCI BAR 0 using `pcim_iomap_region` without validating that the BAR length is large enough to cover the registers it accesses. If a malicious or virtual PCI device (like `syz_pci`) provides a very small BAR 0 (e.g., 4KB), `pcim_iomap_region` succeeds and maps only that small region. Subsequent accesses to registers at large offsets (like `0x39640` or `0x38208`) fall outside the mapped vmalloc region, leading to a page fault.
The difference in the exact crashing instruction and offset is a classic artifact of vmalloc layout randomness. In the original crash, the first out-of-bounds read at `0x39640` (`REG_CAPS`) coincidentally landed inside another valid vmalloc allocation, avoiding a page fault and reading garbage data. The execution then proceeded to `nhi_disable_interrupts`, where the out-of-bounds write at `0x38208` landed in an unmapped guard page, triggering the fault. In the reproduced crash, the vmalloc layout was different, and the very first out-of-bounds read at `0x39640` hit an unmapped page and faulted immediately.
The reproduced crash represents the exact same missing BAR size validation bug as the original crash. ProbePassed:false TerminalError: TitleMatches:true]
|
| 249/3 |
2026/08/10 08:47 |
action |
loop-controller |
0m
Results: map[CapabilitiesVerified:true ContinueSignal: EquivalenceAnalysis:The reproducer successfully triggered the underlying bug.
The original crash was a page fault in `iowrite32` called from `nhi_disable_interrupts` (via `nhi_mask_interrupt`), which accesses `nhi->iobase + 0x38208` (`REG_RING_INTERRUPT_MASK_CLEAR_BASE`).
The reproduced crash is a page fault in `ioread32` called directly from `nhi_probe`, which accesses `nhi->iobase + 0x39640` (`REG_CAPS`).
Both crashes are caused by the exact same root cause: the Thunderbolt driver (`nhi_pci_probe`) maps PCI BAR 0 using `pcim_iomap_region` without validating that the BAR length is large enough to cover the registers it accesses. If a malicious or virtual PCI device (like `syz_pci`) provides a very small BAR 0 (e.g., 4KB), `pcim_iomap_region` succeeds and maps only that small region. Subsequent accesses to registers at large offsets (like `0x39640` or `0x38208`) fall outside the mapped vmalloc region, leading to a page fault.
The difference in the exact crashing instruction and offset is a classic artifact of vmalloc layout randomness. In the original crash, the first out-of-bounds read at `0x39640` (`REG_CAPS`) coincidentally landed inside another valid vmalloc allocation, avoiding a page fault and reading garbage data. The execution then proceeded to `nhi_disable_interrupts`, where the out-of-bounds write at `0x38208` landed in an unmapped guard page, triggering the fault. In the reproduced crash, the vmalloc layout was different, and the very first out-of-bounds read at `0x39640` hit an unmapped page and faulted immediately.
The reproduced crash represents the exact same missing BAR size validation bug as the original crash. OracleFeedback:The reproducer successfully triggered the underlying bug.
The original crash was a page fault in `iowrite32` called from `nhi_disable_interrupts` (via `nhi_mask_interrupt`), which accesses `nhi->iobase + 0x38208` (`REG_RING_INTERRUPT_MASK_CLEAR_BASE`).
The reproduced crash is a page fault in `ioread32` called directly from `nhi_probe`, which accesses `nhi->iobase + 0x39640` (`REG_CAPS`).
Both crashes are caused by the exact same root cause: the Thunderbolt driver (`nhi_pci_probe`) maps PCI BAR 0 using `pcim_iomap_region` without validating that the BAR length is large enough to cover the registers it accesses. If a malicious or virtual PCI device (like `syz_pci`) provides a very small BAR 0 (e.g., 4KB), `pcim_iomap_region` succeeds and maps only that small region. Subsequent accesses to registers at large offsets (like `0x39640` or `0x38208`) fall outside the mapped vmalloc region, leading to a page fault.
The difference in the exact crashing instruction and offset is a classic artifact of vmalloc layout randomness. In the original crash, the first out-of-bounds read at `0x39640` (`REG_CAPS`) coincidentally landed inside another valid vmalloc allocation, avoiding a page fault and reading garbage data. The execution then proceeded to `nhi_disable_interrupts`, where the out-of-bounds write at `0x38208` landed in an unmapped guard page, triggering the fault. In the reproduced crash, the vmalloc layout was different, and the very first out-of-bounds read at `0x39640` hit an unmapped page and faulted immediately.
The reproduced crash represents the exact same missing BAR size validation bug as the original crash. ReproC:#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
void write_file(const char *path, const char *data) {
int fd = open(path, O_WRONLY);
if (fd >= 0) {
if (write(fd, data, strlen(data)) < 0) {
printf("[-] Failed to write to %s: %s\n", path, strerror(errno));
} else {
printf("[+] Successfully wrote '%s' to %s\n", data, path);
}
close(fd);
} else {
printf("[-] Failed to open %s: %s\n", path, strerror(errno));
}
}
int main(void) {
printf("[*] Starting thunderbolt bug reproducer...\n");
DIR *dir = opendir("/sys/bus/pci/devices");
if (!dir) {
printf("[-] Failed to open /sys/bus/pci/devices: %s\n", strerror(errno));
exit(1);
}
struct dirent *ent;
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
char path[256];
unsigned int class_code = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/class", ent->d_name);
FILE *f = fopen(path, "r");
if (!f) continue;
if (fscanf(f, "%x", &class_code) != 1) {
fclose(f);
continue;
}
fclose(f);
// Skip Mass Storage (0x01) and Bridges (0x06) to avoid system hangs
unsigned int base_class = class_code >> 16;
if (base_class == 0x01 || base_class == 0x06) continue;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/resource", ent->d_name);
f = fopen(path, "r");
if (!f) continue;
unsigned long long start = 0, end = 0, flags = 0;
// Read the first line which corresponds to BAR 0
if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
fclose(f);
continue;
}
fclose(f);
// Must be a Memory BAR (IORESOURCE_MEM = 0x200)
if (!(flags & 0x200)) continue;
unsigned long long size = end ? (end - start + 1) : 0;
// Check if BAR 0 is dangerously small for the thunderbolt driver
// The driver expects to access registers up to 0x39944.
if (size > 0 && size < 0x39640) {
unsigned int vendor = 0, device = 0;
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/vendor", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &vendor); fclose(f); }
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/device", ent->d_name);
f = fopen(path, "r");
if (f) { fscanf(f, "%x", &device); fclose(f); }
if (!vendor || !device) continue;
printf("[*] Found candidate device %s (vendor=%04x, device=%04x, BAR0 size=%llu)\n", ent->d_name, vendor, device, size);
// 1. Unbind from current driver
snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/driver/unbind", ent->d_name);
write_file(path, ent->d_name);
// 2. Add ID to thunderbolt driver
char id_str[64];
snprintf(id_str, sizeof(id_str), "%04x %04x", vendor, device);
write_file("/sys/bus/pci/drivers/thunderbolt/new_id", id_str);
// 3. Bind to thunderbolt driver (Triggers the OOB access)
write_file("/sys/bus/pci/drivers/thunderbolt/bind", ent->d_name);
// Wait a bit for async probe or crash
sleep(1);
}
}
closedir(dir);
printf("[+] Done.\n");
return 0;
}
Reproduced:true ReproducedBugTitle:BUG: unable to handle kernel paging request in ioread32 ReproducedCrashReport:thunderbolt 0000:00:03.0: error -EINVAL: cannot enable interrupts, aborting
thunderbolt 0000:00:03.0: probe with driver thunderbolt failed with error -22
BUG: unable to handle page fault for address: ffffc90003c99640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 18bddc067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 5875 Comm: syz-executor277 Not tainted syzkaller #1 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
Call Trace:
<TASK>
nhi_probe+0xcc/0x880 drivers/thunderbolt/nhi.c:1198
nhi_pci_probe+0x46b/0x580 drivers/thunderbolt/pci.c:479
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
bind_store+0x1d0/0x220 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbd4aa6bf7
Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fffa5b186f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555595193400 RCX: 00007fbbd4aa6bf7
RDX: 000000000000000c RSI: 0000555595195883 RDI: 0000000000000004
RBP: 00007fbbd4ae31e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000555595195883
R13: 00007fbbd4ae8bce R14: 00007fbbd4ae6e4c R15: 000000000001ffff
</TASK>
Modules linked in:
CR2: ffffc90003c99640
---[ end trace 0000000000000000 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x1c/0x80 lib/iomap.c:99
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 fb e8 a2 b2 e7 fc 48 81 fb 00 00 04 00 72 09 e8 94 b2 e7 fc <8b> 03 eb 55 48 81 fb 01 00 01 00 72 0a e8 82 b2 e7 fc 89 da ed eb
RSP: 0018:ffffc900046df850 EFLAGS: 00010293
RAX: ffffffff84df702c RBX: ffffc90003c99640 RCX: ffff8881047b0000
RDX: 0000000000000000 RSI: ffffffff8e365c7f RDI: ffffc90003c99640
RBP: 1ffff11032e7c710 R08: ffffffff9081c537 R09: 1ffffffff21038a6
R10: dffffc0000000000 R11: fffffbfff21038a7 R12: ffff8881973e3888
R13: ffff888187b5a0d0 R14: ffff8881973e3838 R15: 1ffff11032e7c711
FS: 0000555595193400(0000) GS:ffff8882e84a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003c99640 CR3: 000000010fc4e000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: f3 0f 1e fa endbr64
12: 55 push %rbp
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
17: e8 a2 b2 e7 fc call 0xfce7b2be
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 94 b2 e7 fc call 0xfce7b2be
* 2a: 8b 03 mov (%rbx),%eax <-- trapping instruction
2c: eb 55 jmp 0x83
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0a jb 0x41
37: e8 82 b2 e7 fc call 0xfce7b2be
3c: 89 da mov %ebx,%edx
3e: ed in (%dx),%eax
3f: eb .byte 0xeb
]
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2026/08/10 08:47 |
action |
save-repro-c |
0m
Results:
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