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KASAN: use-after-free Read in sco_sock_timeout

Status: upstream: reported C repro on 2022/02/10 13:41
Reported-by: syzbot+721232d643053b0b56d9@syzkaller.appspotmail.com
First crash: 1044d, last: 832d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 KASAN: use-after-free Read in sco_sock_timeout C error 105 655d 1186d 0/1 upstream: reported C repro on 2021/09/22 11:06
upstream KASAN: slab-use-after-free Write in sco_sock_timeout bluetooth C done 275 56d 401d 28/28 fixed on 2024/11/26 09:45
upstream KASAN: use-after-free Write in sco_sock_timeout bluetooth C done 272 940d 1212d 22/28 fixed on 2023/02/24 13:50
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2022/10/13 02:24 0m bisect fix linux-4.14.y error job log
2022/09/10 18:41 24m bisect fix linux-4.14.y OK (0) job log log
2022/08/11 18:17 24m bisect fix linux-4.14.y OK (0) job log log
2022/07/12 17:52 24m bisect fix linux-4.14.y OK (0) job log log

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
Read of size 8 at addr ffff8880b0af8d60 by task kworker/0:0/7978

CPU: 0 PID: 7978 Comm: kworker/0:0 Not tainted 4.14.280-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events sco_sock_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
 spin_lock include/linux/spinlock.h:317 [inline]
 sco_sock_timeout+0x7b/0x1a0 net/bluetooth/sco.c:95
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 8136:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 sk_prot_alloc+0x1ba/0x290 net/core/sock.c:1484
 sk_alloc+0x36/0xcd0 net/core/sock.c:1538
 sco_sock_alloc.constprop.0+0x31/0x200 net/bluetooth/sco.c:476
 sco_sock_create+0xc5/0x180 net/bluetooth/sco.c:511
 bt_sock_create+0x13b/0x280 net/bluetooth/af_bluetooth.c:130
 __sock_create+0x303/0x620 net/socket.c:1275
 sock_create net/socket.c:1315 [inline]
 SYSC_socket net/socket.c:1345 [inline]
 SyS_socket+0xd1/0x1b0 net/socket.c:1325
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 8137:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 sk_prot_free net/core/sock.c:1521 [inline]
 __sk_destruct+0x5e3/0x760 net/core/sock.c:1600
 sk_destruct net/core/sock.c:1615 [inline]
 __sk_free+0xd9/0x2d0 net/core/sock.c:1623
 sk_free+0x2b/0x40 net/core/sock.c:1634
 sock_put include/net/sock.h:1664 [inline]
 sco_sock_kill.part.0+0x97/0xb0 net/bluetooth/sco.c:408
 sco_sock_kill net/bluetooth/sco.c:400 [inline]
 sco_sock_release+0x17d/0x2f0 net/bluetooth/sco.c:1043
 __sock_release+0xcd/0x2b0 net/socket.c:602
 sock_close+0x15/0x20 net/socket.c:1139
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 get_signal+0x18a3/0x1ca0 kernel/signal.c:2223
 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792
 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880b0af8cc0
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff8880b0af8cc0, ffff8880b0af94c0)
The buggy address belongs to the page:
page:ffffea0002c2be00 count:1 mapcount:0 mapping:ffff8880b0af8440 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880b0af8440 0000000000000000 0000000100000003
raw: ffffea00024f96a0 ffffea0002c184a0 ffff88813fe74c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880b0af8c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880b0af8c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8880b0af8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8880b0af8d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880b0af8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (19):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/05/20 13:38 linux-4.14.y dffb5c6ff09c cb1ac2e7 .config console log report syz C ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/06/12 17:52 linux-4.14.y b8f3be299d51 0d5abf15 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/06/12 08:51 linux-4.14.y b8f3be299d51 0d5abf15 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/05/20 08:41 linux-4.14.y dffb5c6ff09c cb1ac2e7 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/05/15 10:29 linux-4.14.y 569d1abf9402 744a39e2 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/05/15 03:30 linux-4.14.y 569d1abf9402 744a39e2 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/05/14 19:59 linux-4.14.y 569d1abf9402 744a39e2 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/05/11 09:57 linux-4.14.y e3a56aaade89 8d7b3b67 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/04/11 06:02 linux-4.14.y 74766a973637 e22c3da3 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/04/08 14:32 linux-4.14.y 74766a973637 c6ff3e05 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/04/04 13:00 linux-4.14.y 74766a973637 79a2a8fc .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/04/02 11:35 linux-4.14.y af1af6ebca0e 79a2a8fc .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/03/29 22:45 linux-4.14.y af1af6ebca0e 6bdac766 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/03/15 18:30 linux-4.14.y af48f51cb593 9e8eaa75 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/03/11 11:37 linux-4.14.y c9fcc1545c3b 9e8eaa75 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/03/09 12:04 linux-4.14.y c9fcc1545c3b 9e8eaa75 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/03/08 17:32 linux-4.14.y e853993d29aa 7bdd8b2c .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/03/08 12:51 linux-4.14.y e853993d29aa 7bdd8b2c .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
2022/02/10 13:40 linux-4.14.y 21ad423fe521 0b33604d .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in sco_sock_timeout
* Struck through repros no longer work on HEAD.