syzbot


general protection fault in __device_attach

Status: upstream: reported C repro on 2022/03/14 08:46
Reported-by: syzbot+dd3c97de244683533381@syzkaller.appspotmail.com
First crash: 202d, last: 56d

Cause bisection: introduced by (bisect log) :
commit a9c4cf299f5f79d5016c8a9646fa1fc49381a8c1
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Fri Jun 18 13:41:27 2021 +0000

  ACPI: sysfs: Use __ATTR_RO() and __ATTR_RW() macros

Crash: general protection fault in __device_attach (log)
Repro: C syz .config
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 general protection fault in __device_attach C error 31 12d 656d 0/1 upstream: reported C repro on 2020/12/11 04:31
android-5-10 general protection fault in __device_attach 1 150d 150d 0/2 auto-closed as invalid on 2022/07/29 21:17
android-54 general protection fault in __device_attach 8 341d 598d 0/2 auto-closed as invalid on 2022/02/18 18:30
Patch testing requests:
Created Duration User Patch Repo Result
2022/06/03 07:44 17m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d1dc87763f40 OK
2022/06/03 03:35 10m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d1dc87763f40 report log

Sample crash report:
usb usb9: device_add((null)) --> -22
general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
CPU: 0 PID: 4190 Comm: syz-executor322 Not tainted 5.18.0-syzkaller-11972-gd1dc87763f40 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__device_attach+0xad/0x4a0 drivers/base/dd.c:948
Code: e8 03 42 80 3c 20 00 0f 85 a3 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 48 49 8d bc 24 08 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 6e 03 00 00 45 0f b6 b4 24 08 01 00
RSP: 0018:ffffc90003447b98 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff92000688f74 RCX: 0000000000000000
RDX: 0000000000000021 RSI: 0000000000000002 RDI: 0000000000000108
RBP: ffff88807a22f030 R08: 0000000000000000 R09: ffffffff8dbb1097
R10: fffffbfff1b76212 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000fffffff0 R15: ffff88807a22f0b0
FS:  0000555557335300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2b779a90b0 CR3: 000000007a1a7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 proc_ioctl.part.0+0x48e/0x560 drivers/usb/core/devio.c:2356
 proc_ioctl drivers/usb/core/devio.c:182 [inline]
 proc_ioctl_default drivers/usb/core/devio.c:2391 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2747 [inline]
 usbdev_ioctl+0x2c08/0x36f0 drivers/usb/core/devio.c:2807
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f2b77979779
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe17c6ed98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2b779bd184 RCX: 00007f2b77979779
RDX: 0000000020000040 RSI: 00000000c0105512 RDI: 0000000000000006
RBP: 00007ffe17c6edb0 R08: 0000000000000001 R09: 0000000000000001
R10: 000000000000ffff R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__device_attach+0xad/0x4a0 drivers/base/dd.c:948
Code: e8 03 42 80 3c 20 00 0f 85 a3 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 48 49 8d bc 24 08 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 6e 03 00 00 45 0f b6 b4 24 08 01 00
RSP: 0018:ffffc90003447b98 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff92000688f74 RCX: 0000000000000000
RDX: 0000000000000021 RSI: 0000000000000002 RDI: 0000000000000108
RBP: ffff88807a22f030 R08: 0000000000000000 R09: ffffffff8dbb1097
R10: fffffbfff1b76212 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000fffffff0 R15: ffff88807a22f0b0
FS:  0000555557335300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2b779a90b0 CR3: 000000007a1a7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 03 42 80 3c       	callq  0x3c804208
   5:	20 00                	and    %al,(%rax)
   7:	0f 85 a3 03 00 00    	jne    0x3b0
   d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  14:	fc ff df
  17:	4c 8b 65 48          	mov    0x48(%rbp),%r12
  1b:	49 8d bc 24 08 01 00 	lea    0x108(%r12),%rdi
  22:	00
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 06                	je     0x38
  32:	0f 8e 6e 03 00 00    	jle    0x3a6
  38:	45                   	rex.RB
  39:	0f                   	.byte 0xf
  3a:	b6 b4                	mov    $0xb4,%dh
  3c:	24 08                	and    $0x8,%al
  3e:	01 00                	add    %eax,(%rax)

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2022/08/02 19:24 upstream c1dbe9a1c86d 5783034f .config log report syz C
ci-upstream-kasan-gce-selinux-root 2022/07/03 18:54 upstream 20855e4cb361 5783034f .config log report syz C
* Struck through repros no longer work on HEAD.
Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2022/06/02 19:48 upstream d1dc87763f40 5783034f .config log report syz C general protection fault in __device_attach
ci-upstream-kasan-gce-root 2022/03/10 02:48 upstream e7e19defa575 9e8eaa75 .config log report info general protection fault in __device_attach
* Struck through repros no longer work on HEAD.