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KASAN: use-after-free Read in __video_do_ioctl

Status: closed as dup on 2019/08/13 12:28
Subsystems: media usb input
[Documentation on labels]
Reported-by: syzbot+5b7575b3f6820232e17c@syzkaller.appspotmail.com
First crash: 2049d, last: 1948d
▶ ▼ Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: use-after-free Read in v4l2_ioctl usb media C 33 1967d 2048d
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
KASAN: use-after-free Read in __video_do_ioctl 1 (3) 2019/08/13 12:28
Reminder: 35 open syzbot bugs in media subsystem 1 (1) 2019/07/24 01:39
Reminder: 28 open syzbot bugs in media subsystem 1 (1) 2019/06/27 03:53

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3a5d/0x5340 kernel/locking/lockdep.c:3665
Read of size 8 at addr ffff8881cfd80808 by task v4l_id/3788

CPU: 1 PID: 3788 Comm: v4l_id Not tainted 5.2.0-rc6+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x67/0x231 mm/kasan/report.c:188
 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317
 kasan_report+0xe/0x20 mm/kasan/common.c:614
 __lock_acquire+0x3a5d/0x5340 kernel/locking/lockdep.c:3665
 lock_acquire+0x100/0x2b0 kernel/locking/lockdep.c:4303
 __mutex_lock_common kernel/locking/mutex.c:926 [inline]
 __mutex_lock+0xf9/0x12b0 kernel/locking/mutex.c:1073
 __video_do_ioctl+0x5c7/0xb30 drivers/media/v4l2-core/v4l2-ioctl.c:2839
 video_usercopy+0x446/0xee0 drivers/media/v4l2-core/v4l2-ioctl.c:3053
 v4l2_ioctl+0x147/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:360
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:696
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
 do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fbaeda44347
Code: 90 90 90 48 8b 05 f1 fa 2a 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 90 90 90 90 90 90 90 90 90 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c1 fa 2a 00 31 d2 48 29 c2 64
RSP: 002b:00007ffeeb4faf58 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fbaeda44347
RDX: 00007ffeeb4faf60 RSI: 0000000080685600 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000400884
R13: 00007ffeeb4fb0b0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 107:
 save_stack+0x1b/0x80 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:462
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc_node mm/slub.c:2748 [inline]
 __kmalloc_node_track_caller+0xee/0x370 mm/slub.c:4363
 alloc_dr drivers/base/devres.c:103 [inline]
 devm_kmalloc+0x87/0x190 drivers/base/devres.c:815
 devm_kzalloc include/linux/device.h:679 [inline]
 usb_raremono_probe+0x2f/0x231 drivers/media/radio/radio-raremono.c:298
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x660 drivers/base/dd.c:509
 driver_probe_device+0x104/0x210 drivers/base/dd.c:670
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:843
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2111
 usb_set_configuration+0xdf6/0x1670 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+0x281/0x660 drivers/base/dd.c:509
 driver_probe_device+0x104/0x210 drivers/base/dd.c:670
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:843
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2111
 usb_new_device.cold+0x8c1/0x1016 drivers/usb/core/hub.c:2536
 hub_port_connect drivers/usb/core/hub.c:5098 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x1b3d/0x35f0 drivers/usb/core/hub.c:5441
 process_one_work+0x905/0x1570 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x30b/0x410 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 107:
 save_stack+0x1b/0x80 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:451
 slab_free_hook mm/slub.c:1421 [inline]
 slab_free_freelist_hook mm/slub.c:1448 [inline]
 slab_free mm/slub.c:2994 [inline]
 kfree+0xd7/0x280 mm/slub.c:3949
 release_nodes+0x4a1/0x910 drivers/base/devres.c:508
 devres_release_all+0x74/0xc3 drivers/base/devres.c:529
 __device_release_driver drivers/base/dd.c:1085 [inline]
 device_release_driver_internal+0x21b/0x4c0 drivers/base/dd.c:1112
 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
 device_del+0x460/0xb80 drivers/base/core.c:2274
 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
 usb_disconnect+0x284/0x830 drivers/usb/core/hub.c:2199
 hub_port_connect drivers/usb/core/hub.c:4949 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x143d/0x35f0 drivers/usb/core/hub.c:5441
 process_one_work+0x905/0x1570 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x30b/0x410 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881cfd80000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 2056 bytes inside of
 4096-byte region [ffff8881cfd80000, ffff8881cfd81000)
The buggy address belongs to the page:
page:ffffea00073f6000 refcount:1 mapcount:0 mapping:ffff8881dac02600 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000200 ffff8881dac02600
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881cfd80700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881cfd80780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881cfd80800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8881cfd80880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881cfd80900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (63):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/07/15 00:23 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 2bbe2f05 .config console log report syz ci2-upstream-usb
2019/07/23 15:24 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 bb071d58 .config console log report ci2-upstream-usb
2019/07/23 06:55 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 bb071d58 .config console log report ci2-upstream-usb
2019/07/21 17:46 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 1656845f .config console log report ci2-upstream-usb
2019/07/19 06:05 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 7bb222f7 .config console log report ci2-upstream-usb
2019/07/15 02:16 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 2bbe2f05 .config console log report ci2-upstream-usb
2019/07/14 21:39 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 2bbe2f05 .config console log report ci2-upstream-usb
2019/06/18 16:38 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f e3f76baa .config console log report ci2-upstream-usb
2019/06/17 02:47 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 442206d7 .config console log report ci2-upstream-usb
2019/06/13 13:10 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 3f4e812b .config console log report ci2-upstream-usb
2019/06/07 00:48 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f f5dd5568 .config console log report ci2-upstream-usb
2019/06/06 05:40 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f a547defc .config console log report ci2-upstream-usb
2019/06/03 15:05 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 63bf051f .config console log report ci2-upstream-usb
2019/06/03 04:48 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/06/03 02:50 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/06/02 01:00 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/05/31 15:19 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f a8482b78 .config console log report ci2-upstream-usb
2019/05/24 17:30 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 0dadcd9d .config console log report ci2-upstream-usb
2019/05/23 21:26 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 0dadcd9d .config console log report ci2-upstream-usb
2019/05/20 18:43 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce b5641f32 .config console log report ci2-upstream-usb
2019/05/19 11:55 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 5a4461b0 .config console log report ci2-upstream-usb
2019/05/17 22:01 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 40046286 .config console log report ci2-upstream-usb
2019/05/13 16:31 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 16ab1e89 .config console log report ci2-upstream-usb
2019/05/12 23:38 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 5f302c04 .config console log report ci2-upstream-usb
2019/05/12 23:07 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 5f302c04 .config console log report ci2-upstream-usb
2019/05/12 19:54 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 5f302c04 .config console log report ci2-upstream-usb
2019/05/12 10:11 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce c017728b .config console log report ci2-upstream-usb
2019/05/11 20:12 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 0637a7f0 .config console log report ci2-upstream-usb
2019/05/11 17:52 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 0637a7f0 .config console log report ci2-upstream-usb
2019/05/11 16:45 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 46caad94 .config console log report ci2-upstream-usb
2019/05/11 16:22 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 46caad94 .config console log report ci2-upstream-usb
2019/05/09 21:48 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 214bf476 .config console log report ci2-upstream-usb
2019/05/09 11:50 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 1ab4c999 .config console log report ci2-upstream-usb
2019/05/09 01:28 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 1bb034d0 .config console log report ci2-upstream-usb
2019/05/08 11:39 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce a7383bfa .config console log report ci2-upstream-usb
2019/05/07 00:05 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 148296f4 .config console log report ci2-upstream-usb
2019/05/06 23:27 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 148296f4 .config console log report ci2-upstream-usb
2019/05/06 17:41 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 148296f4 .config console log report ci2-upstream-usb
2019/05/06 03:42 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce d28f4ce5 .config console log report ci2-upstream-usb
2019/05/04 05:26 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce d28f4ce5 .config console log report ci2-upstream-usb
2019/05/04 02:55 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce d28f4ce5 .config console log report ci2-upstream-usb
2019/05/01 23:54 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 7516d9fa .config console log report ci2-upstream-usb
2019/05/01 18:46 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 7516d9fa .config console log report ci2-upstream-usb
2019/05/01 17:18 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 618456b4 .config console log report ci2-upstream-usb
2019/04/29 19:52 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce b617407b .config console log report ci2-upstream-usb
2019/04/29 17:18 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce b617407b .config console log report ci2-upstream-usb
2019/04/28 21:16 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce b617407b .config console log report ci2-upstream-usb
2019/04/27 10:14 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce b617407b .config console log report ci2-upstream-usb
2019/04/26 05:19 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce b617407b .config console log report ci2-upstream-usb
2019/04/25 23:07 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce f46aabc8 .config console log report ci2-upstream-usb
2019/04/24 13:17 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa 8e3c52b1 .config console log report ci2-upstream-usb
2019/04/24 12:13 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa 8e3c52b1 .config console log report ci2-upstream-usb
2019/04/24 06:19 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa 2398edea .config console log report ci2-upstream-usb
2019/04/23 21:13 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa 2398edea .config console log report ci2-upstream-usb
2019/04/22 10:12 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa 0a77c33c .config console log report ci2-upstream-usb
2019/04/21 14:43 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa b0e8efcb .config console log report ci2-upstream-usb
2019/04/21 06:41 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa b0e8efcb .config console log report ci2-upstream-usb
2019/04/19 16:56 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa b0e8efcb .config console log report ci2-upstream-usb
2019/04/19 11:20 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa b0e8efcb .config console log report ci2-upstream-usb
2019/04/17 09:23 https://github.com/google/kasan.git usb-fuzzer 9a33b36996cb b0e8efcb .config console log report ci2-upstream-usb
2019/04/14 05:12 https://github.com/google/kasan.git usb-fuzzer 9a33b36996cb c402d8f1 .config console log report ci2-upstream-usb
2019/04/13 05:43 https://github.com/google/kasan.git usb-fuzzer 9a33b36996cb c402d8f1 .config console log report ci2-upstream-usb
* Struck through repros no longer work on HEAD.