KASAN: use-after-free Read in sco_sock_timeout

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syzbot

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Sep 22, 2021, 7:06:24 AM9/22/21
to syzkaller...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: 2950c9c5e0df Linux 4.19.207
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=137c754b300000
kernel config: https://syzkaller.appspot.com/x/.config?x=8273060cfa230984
dashboard link: https://syzkaller.appspot.com/bug?extid=6b7fc56a7391b8277521
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6b7fc5...@syzkaller.appspotmail.com

loop5: p4 size 3657465856 extends beyond EOD, truncated
bridge0: port 2(bridge_slave_1) entered disabled state
bridge0: port 1(bridge_slave_0) entered disabled state
ieee802154 phy0 wpan0: encryption failed: -22
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff888052c5d6a0 by task kworker/1:6/31351

CPU: 1 PID: 31351 Comm: kworker/1:6 Not tainted 4.19.207-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:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
kasan_report mm/kasan/report.c:412 [inline]
__asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
__lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
sco_sock_timeout+0x7b/0x1b0 net/bluetooth/sco.c:95
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 1421:
__do_kmalloc mm/slab.c:3727 [inline]
__kmalloc+0x15a/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1466
sk_alloc+0x36/0xec0 net/core/sock.c:1520
sco_sock_alloc.constprop.0+0x31/0x200 net/bluetooth/sco.c:480
sco_sock_create+0xd5/0x180 net/bluetooth/sco.c:515
bt_sock_create+0x154/0x2a0 net/bluetooth/af_bluetooth.c:130
__sock_create+0x3d8/0x740 net/socket.c:1365
sock_create net/socket.c:1416 [inline]
__sys_socket+0xef/0x200 net/socket.c:1458
__do_sys_socket net/socket.c:1467 [inline]
__se_sys_socket net/socket.c:1465 [inline]
__x64_sys_socket+0x6f/0xb0 net/socket.c:1465
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 1424:
__cache_free mm/slab.c:3503 [inline]
kfree+0xcc/0x210 mm/slab.c:3822
sk_prot_free net/core/sock.c:1503 [inline]
__sk_destruct+0x684/0x8a0 net/core/sock.c:1584
sk_destruct net/core/sock.c:1599 [inline]
__sk_free+0x165/0x3b0 net/core/sock.c:1610
sk_free+0x3b/0x50 net/core/sock.c:1621
sock_put include/net/sock.h:1711 [inline]
sco_sock_kill.part.0+0xaa/0xc0 net/bluetooth/sco.c:412
sco_sock_kill net/bluetooth/sco.c:404 [inline]
sco_sock_release+0x1a2/0x330 net/bluetooth/sco.c:1035
__sock_release+0xcd/0x2a0 net/socket.c:599
sock_close+0x15/0x20 net/socket.c:1214
__fput+0x2ce/0x890 fs/file_table.c:278
task_work_run+0x148/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888052c5d600
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
2048-byte region [ffff888052c5d600, ffff888052c5de00)
The buggy address belongs to the page:
page:ffffea00014b1700 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0xffff888052c5cd80 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea000284e608 ffffea00016eab88 ffff88813bff0c40
raw: ffff888052c5cd80 ffff888052c5c500 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff888052c5d580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888052c5d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888052c5d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888052c5d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888052c5d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
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syzbot

unread,
Sep 24, 2021, 5:31:30 AM9/24/21
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:

HEAD commit: 2950c9c5e0df Linux 4.19.207
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10fb240b300000
kernel config: https://syzkaller.appspot.com/x/.config?x=8273060cfa230984
dashboard link: https://syzkaller.appspot.com/bug?extid=6b7fc56a7391b8277521
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1375ec9d300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6b7fc5...@syzkaller.appspotmail.com

Bluetooth: hci2: command 0x041b tx timeout
Bluetooth: hci2: command 0x040f tx timeout
Bluetooth: hci2: command 0x0419 tx timeout
Bluetooth: hci2: command 0x0405 tx timeout
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff8880a9e6a9e0 by task kworker/1:238/2484

CPU: 1 PID: 2484 Comm: kworker/1:238 Not tainted 4.19.207-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:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
kasan_report mm/kasan/report.c:412 [inline]
__asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
__lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
sco_sock_timeout+0x7b/0x1b0 net/bluetooth/sco.c:95
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 17229:
__do_kmalloc mm/slab.c:3727 [inline]
__kmalloc+0x15a/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1466
sk_alloc+0x36/0xec0 net/core/sock.c:1520
sco_sock_alloc.constprop.0+0x31/0x200 net/bluetooth/sco.c:480
sco_sock_create+0xd5/0x180 net/bluetooth/sco.c:515
bt_sock_create+0x154/0x2a0 net/bluetooth/af_bluetooth.c:130
__sock_create+0x3d8/0x740 net/socket.c:1365
sock_create net/socket.c:1416 [inline]
__sys_socket+0xef/0x200 net/socket.c:1458
__do_sys_socket net/socket.c:1467 [inline]
__se_sys_socket net/socket.c:1465 [inline]
__x64_sys_socket+0x6f/0xb0 net/socket.c:1465
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 17230:
__cache_free mm/slab.c:3503 [inline]
kfree+0xcc/0x210 mm/slab.c:3822
sk_prot_free net/core/sock.c:1503 [inline]
__sk_destruct+0x684/0x8a0 net/core/sock.c:1584
sk_destruct net/core/sock.c:1599 [inline]
__sk_free+0x165/0x3b0 net/core/sock.c:1610
sk_free+0x3b/0x50 net/core/sock.c:1621
sock_put include/net/sock.h:1711 [inline]
sco_sock_kill.part.0+0xaa/0xc0 net/bluetooth/sco.c:412
sco_sock_kill net/bluetooth/sco.c:404 [inline]
sco_sock_release+0x1a2/0x330 net/bluetooth/sco.c:1035
__sock_release+0xcd/0x2a0 net/socket.c:599
sock_close+0x15/0x20 net/socket.c:1214
__fput+0x2ce/0x890 fs/file_table.c:278
task_work_run+0x148/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a9e6a940
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
2048-byte region [ffff8880a9e6a940, ffff8880a9e6b140)
The buggy address belongs to the page:
page:ffffea0002a79a80 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0xffff8880a9e6b1c0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea0002cadf08 ffffea0002ada288 ffff88813bff0c40
raw: ffff8880a9e6b1c0 ffff8880a9e6a0c0 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8880a9e6a880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8880a9e6a900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8880a9e6a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880a9e6aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a9e6aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

syzbot

unread,
Jun 22, 2022, 7:54:22 PM6/22/22
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:

HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12209e90080000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=6b7fc56a7391b8277521
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1339353ff00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1052f118080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6b7fc5...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff8880b25a4d20 by task kworker/1:1/34

CPU: 1 PID: 34 Comm: kworker/1:1 Not tainted 4.19.211-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:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
kasan_report mm/kasan/report.c:412 [inline]
__asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
__lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
sco_sock_timeout+0x7b/0x1b0 net/bluetooth/sco.c:95
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 8153:
__do_kmalloc mm/slab.c:3727 [inline]
__kmalloc+0x15a/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1483
sk_alloc+0x36/0xec0 net/core/sock.c:1537
sco_sock_alloc.constprop.0+0x31/0x200 net/bluetooth/sco.c:480
sco_sock_create+0xd5/0x180 net/bluetooth/sco.c:515
bt_sock_create+0x154/0x2a0 net/bluetooth/af_bluetooth.c:130
__sock_create+0x3d8/0x740 net/socket.c:1365
sock_create net/socket.c:1416 [inline]
__sys_socket+0xef/0x200 net/socket.c:1458
__do_sys_socket net/socket.c:1467 [inline]
__se_sys_socket net/socket.c:1465 [inline]
__x64_sys_socket+0x6f/0xb0 net/socket.c:1465
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8154:
__cache_free mm/slab.c:3503 [inline]
kfree+0xcc/0x210 mm/slab.c:3822
sk_prot_free net/core/sock.c:1520 [inline]
__sk_destruct+0x684/0x8a0 net/core/sock.c:1602
sk_destruct net/core/sock.c:1617 [inline]
__sk_free+0x165/0x3b0 net/core/sock.c:1628
sk_free+0x3b/0x50 net/core/sock.c:1639
sock_put include/net/sock.h:1713 [inline]
sco_sock_kill.part.0+0xaa/0xc0 net/bluetooth/sco.c:412
sco_sock_kill net/bluetooth/sco.c:404 [inline]
sco_sock_release+0x1a2/0x330 net/bluetooth/sco.c:1035
__sock_release+0xcd/0x2a0 net/socket.c:599
sock_close+0x15/0x20 net/socket.c:1214
__fput+0x2ce/0x890 fs/file_table.c:278
task_work_run+0x148/0x1c0 kernel/task_work.c:113
get_signal+0x1b64/0x1f70 kernel/signal.c:2400
do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799
exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880b25a4c80
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
2048-byte region [ffff8880b25a4c80, ffff8880b25a5480)
The buggy address belongs to the page:
page:ffffea0002c96900 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea0002541c08 ffffea0002544388 ffff88813bff0c40
raw: 0000000000000000 ffff8880b25a4400 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8880b25a4c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880b25a4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880b25a4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880b25a4d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880b25a4e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

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