syzbot

 sign-in | mailing list | source | docs
🐞 Open [934] ≡ Subsystems 🐞 Fixed [4767] 🐞 Invalid [11202] ⬇ Missing Backports [25] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

KASAN: use-after-free Read in __queue_work

Status: closed as invalid on 2017/10/27 09:34
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+caa569914000a7e8ee84367b23a8f0f0f6e61128@syzkaller.appspotmail.com
First crash: 2201d, last: 2192d
▶ ▼ Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 KASAN: use-after-free Read in __queue_work C 19 1861d 1623d 0/3 public: reported C repro on 2019/04/13 00:00
linux-4.19 KASAN: use-after-free Read in __queue_work syz done 5 773d 1145d 1/1 fixed on 2021/09/10 09:12
linux-4.14 KASAN: use-after-free Read in __queue_work syz error 4 381d 1145d 0/1 upstream: reported syz repro on 2020/08/03 15:06
upstream KASAN: use-after-free Read in __queue_work (3) bluetooth syz done done 83 311d 1140d 0/25 upstream: reported syz repro on 2020/08/08 21:27
upstream KASAN: use-after-free Read in __queue_work (2) C done done 577 1548d 1901d 16/25 fixed on 2020/01/08 01:07

Sample crash report:
BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:276 [inline]
BUG: KASAN: use-after-free in list_empty include/linux/list.h:202 [inline]
BUG: KASAN: use-after-free in __queue_work+0x1029/0x1150 kernel/workqueue.c:1442
Read of size 8 at addr ffff8801d0ac0d00 by task syz-executor3/12844

CPU: 1 PID: 12844 Comm: syz-executor3 Not tainted 4.13.0-mm1+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x24e/0x340 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:276 [inline]
 list_empty include/linux/list.h:202 [inline]
 __queue_work+0x1029/0x1150 kernel/workqueue.c:1442
 queue_work_on+0x16a/0x1c0 kernel/workqueue.c:1486
 queue_work include/linux/workqueue.h:489 [inline]
 strp_check_rcv+0x25/0x30 net/strparser/strparser.c:553
 kcm_attach net/kcm/kcmsock.c:1439 [inline]
 kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline]
 kcm_ioctl+0x826/0x1610 net/kcm/kcmsock.c:1695
 sock_do_ioctl+0x65/0xb0 net/socket.c:961
 sock_ioctl+0x2c2/0x440 net/socket.c:1058
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4520a9
RSP: 002b:00007f03b7352c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000007180b0 RCX: 00000000004520a9
RDX: 00000000209b9000 RSI: 00000000000089e0 RDI: 000000000000000a
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b73ea
R13: 00000000ffffffff R14: 0000000000000005 R15: 0000000020b4cfd0

Allocated by task 12844:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3561
 kmem_cache_zalloc include/linux/slab.h:656 [inline]
 kcm_attach net/kcm/kcmsock.c:1394 [inline]
 kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline]
 kcm_ioctl+0x2d1/0x1610 net/kcm/kcmsock.c:1695
 sock_do_ioctl+0x65/0xb0 net/socket.c:961
 sock_ioctl+0x2c2/0x440 net/socket.c:1058
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 12852:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3503 [inline]
 kmem_cache_free+0x77/0x280 mm/slab.c:3763
 kcm_unattach+0xe50/0x1510 net/kcm/kcmsock.c:1563
 kcm_unattach_ioctl net/kcm/kcmsock.c:1608 [inline]
 kcm_ioctl+0xdf0/0x1610 net/kcm/kcmsock.c:1705
 sock_do_ioctl+0x65/0xb0 net/socket.c:961
 sock_ioctl+0x2c2/0x440 net/socket.c:1058
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe

The buggy address belongs to the object at ffff8801d0ac0bc0
 which belongs to the cache kcm_psock_cache of size 664
The buggy address is located 320 bytes inside of
 664-byte region [ffff8801d0ac0bc0, ffff8801d0ac0e58)
The buggy address belongs to the page:
page:ffffea000742b000 count:1 mapcount:0 mapping:ffff8801d0ac0200 index:0x0 compound_mapcount: 0
flags: 0x200000000008100(slab|head)
raw: 0200000000008100 ffff8801d0ac0200 0000000000000000 0000000100000009
raw: ffffea000743da20 ffffea0007420620 ffff8801d2e2f680 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d0ac0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801d0ac0c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801d0ac0d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8801d0ac0d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801d0ac0e00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/09/21 08:29 mmots 720bbe532b7c c26ea367 .config console log report syz ci-upstream-mmots-kasan-gce
2017/09/12 01:34 linux-next a31cc455c512 449b6f15 .config console log report ci-upstream-next-kasan-gce
* Struck through repros no longer work on HEAD.