syzbot


KASAN: slab-out-of-bounds Read in hid_field_extract

Status: fixed on 2020/02/18 14:31
Subsystems: input usb
[Documentation on labels]
Reported-by: syzbot+09ef48aa58261464b621@syzkaller.appspotmail.com
Fix commit: 8ec321e96e05 HID: Fix slab-out-of-bounds read in hid_field_extract
First crash: 1636d, last: 1602d
Discussions (14)
Title Replies (including bot) Last reply
[patch 001/127] kcov: cleanup debug messages 1 (1) 2020/06/04 23:45
[PATCH 3.16 000/245] 3.16.83-rc1 review 260 (260) 2020/04/24 17:54
[patch 151/166] kcov: cleanup debug messages 1 (1) 2020/04/07 03:12
[PATCH v3 0/7] kcov: collect coverage from usb soft interrupts 8 (8) 2020/03/19 22:11
[PATCH v2 0/3] kcov: collect coverage from usb soft interrupts 6 (6) 2020/03/13 14:56
[PATCH v1 0/3] kcov: collect coverage from usb soft interrupts 6 (6) 2020/02/27 15:44
[PATCH RFC 0/2] kcov: collect coverage from usbhid interrupts 14 (14) 2020/02/26 18:42
[PATCH 5.4 00/78] 5.4.12-stable review 107 (107) 2020/02/11 15:01
[PATCH 4.19 00/46] 4.19.96-stable review 51 (51) 2020/01/15 02:09
[PATCH 4.14 00/39] 4.14.165-stable review 44 (44) 2020/01/15 02:08
[PATCH 4.9 00/31] 4.9.210-stable review 36 (36) 2020/01/15 02:08
[PATCH 4.4 00/28] 4.4.210-stable review 33 (33) 2020/01/15 02:08
[PATCH] HID: Fix slab-out-of-bounds read in hid_field_extract 4 (4) 2019/12/13 08:44
KASAN: slab-out-of-bounds Read in hid_field_extract 2 (5) 2019/12/09 23:46
Last patch testing requests (2)
Created Duration User Patch Repo Result
2019/12/09 19:51 16m stern@rowland.harvard.edu patch https://github.com/google/kasan.git 1f22d15c OK
2019/12/09 18:38 10m stern@rowland.harvard.edu patch https://github.com/google/kasan.git 1f22d15c report log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in __extract drivers/hid/hid-core.c:1345 [inline]
BUG: KASAN: slab-out-of-bounds in hid_field_extract+0x150/0x170 drivers/hid/hid-core.c:1365
Read of size 1 at addr ffff8881cfe15000 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xef/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0+0x16/0x200 mm/kasan/report.c:374
 __kasan_report.cold+0x37/0x7f mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:639
 __extract drivers/hid/hid-core.c:1345 [inline]
 hid_field_extract+0x150/0x170 drivers/hid/hid-core.c:1365
 hid_input_field drivers/hid/hid-core.c:1537 [inline]
 hid_report_raw_event+0x448/0xed0 drivers/hid/hid-core.c:1757
 hid_input_report+0x315/0x3f0 drivers/hid/hid-core.c:1824
 hid_irq_in+0x50e/0x690 drivers/hid/usbhid/hid-core.c:284
 __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1648
 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1713
 dummy_timer+0x123d/0x2fdb drivers/usb/gadget/udc/dummy_hcd.c:1966
 call_timer_fn+0x179/0x650 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x5e3/0x1490 kernel/time/timer.c:1786
 __do_softirq+0x221/0x912 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x178/0x1a0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:default_idle+0x28/0x2e0 arch/x86/kernel/process.c:700
Code: cc cc 41 56 41 55 65 44 8b 2d 6c 7c 86 7a 41 54 55 53 0f 1f 44 00 00 e8 76 08 c9 fb e9 07 00 00 00 0f 00 2d 7a 02 47 00 fb f4 <65> 44 8b 2d 48 7c 86 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffffff86e07da8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffffffff86e2c200 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff86e2ca4c
RBP: fffffbfff0dc5840 R08: ffffffff86e2c200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x3c3/0x4e0 kernel/sched/idle.c:269
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361
 start_kernel+0x8b1/0x8eb init/main.c:785
 secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242

Allocated by task 12:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:486
 kmalloc include/linux/slab.h:561 [inline]
 hcd_buffer_alloc+0x1ed/0x290 drivers/usb/core/buffer.c:132
 usb_alloc_coherent+0x5d/0x80 drivers/usb/core/usb.c:910
 hid_alloc_buffers drivers/hid/usbhid/hid-core.c:846 [inline]
 usbhid_start+0x60b/0x22f0 drivers/hid/usbhid/hid-core.c:1075
 hid_hw_start+0x5d/0x130 drivers/hid/hid-core.c:2022
 ms_probe+0x159/0x4d0 drivers/hid/hid-microsoft.c:394
 hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2255
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0x1480/0x1c20 drivers/base/core.c:2487
 hid_add_device drivers/hid/hid-core.c:2411 [inline]
 hid_add_device+0x33c/0x9a0 drivers/hid/hid-core.c:2360
 usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0x1480/0x1c20 drivers/base/core.c:2487
 usb_set_configuration+0xe67/0x1740 drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0x1480/0x1c20 drivers/base/core.c:2487
 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537
 hub_port_connect drivers/usb/core/hub.c:5184 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
 port_event drivers/usb/core/hub.c:5470 [inline]
 hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264
 worker_thread+0x96/0xe20 kernel/workqueue.c:2410
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 268:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x129/0x170 mm/kasan/common.c:474
 slab_free_hook mm/slub.c:1425 [inline]
 slab_free_freelist_hook mm/slub.c:1458 [inline]
 slab_free mm/slub.c:3005 [inline]
 kfree+0xda/0x310 mm/slub.c:3957
 kvfree+0x6a/0xd0 mm/util.c:603
 seq_release+0x4f/0x80 fs/seq_file.c:360
 kernfs_fop_release+0xf2/0x190 fs/kernfs/file.c:780
 __fput+0x2d7/0x840 fs/file_table.c:280
 task_work_run+0x13f/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x4e0/0x5c0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881cfe14000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 0 bytes to the right of
 4096-byte region [ffff8881cfe14000, ffff8881cfe15000)
The buggy address belongs to the page:
page:ffffea00073f8400 refcount:1 mapcount:0 mapping:ffff8881da00c280 index:0x0 compound_mapcount: 0
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c280
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881cfe14f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881cfe14f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881cfe15000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8881cfe15080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881cfe15100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/21 04:59 https://github.com/google/kasan.git usb-fuzzer ecdf2214f472 bc586918 .config console log report syz C ci2-upstream-usb
2019/12/19 21:07 https://github.com/google/kasan.git usb-fuzzer ecdf2214f472 36650b4b .config console log report syz C ci2-upstream-usb
2019/12/18 03:41 https://github.com/google/kasan.git usb-fuzzer d533c9925862 1af3875f .config console log report syz C ci2-upstream-usb
2019/12/06 08:05 https://github.com/google/kasan.git usb-fuzzer 1f22d15c209f 98b4ef2d .config console log report syz C ci2-upstream-usb
2020/01/09 00:55 https://github.com/google/kasan.git usb-fuzzer ae1794106b94 ddc3e859 .config console log report ci2-upstream-usb
2019/12/14 01:01 https://github.com/google/kasan.git usb-fuzzer 4cc037ecf2cb a5c1ab05 .config console log report ci2-upstream-usb
* Struck through repros no longer work on HEAD.