[syzbot] KASAN: use-after-free Read in nfc_llcp_put_ssap

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May 1, 2021, 1:50:21 AMMay 1
to da...@davemloft.net, ku...@kernel.org, linux-...@vger.kernel.org, net...@vger.kernel.org, syzkall...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: 18a3c5f7 Merge tag 'for_linus' of git://git.kernel.org/pub..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=161628b9d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9404cfa686df2c05
dashboard link: https://syzkaller.appspot.com/bug?extid=e4689b43d2ed2ed63611

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+e4689b...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:931 [inline]
BUG: KASAN: use-after-free in __mutex_lock+0x1034/0x1120 kernel/locking/mutex.c:1096
Read of size 8 at addr ffff88801a106080 by task syz-executor.0/31485

CPU: 1 PID: 31485 Comm: syz-executor.0 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
__mutex_lock_common kernel/locking/mutex.c:931 [inline]
__mutex_lock+0x1034/0x1120 kernel/locking/mutex.c:1096
nfc_llcp_put_ssap+0x49/0x2e0 net/nfc/llcp_core.c:492
llcp_sock_release+0x1d2/0x580 net/nfc/llcp_sock.c:626
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
exit_task_work include/linux/task_work.h:30 [inline]
do_exit+0xbfc/0x2a60 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
get_signal+0x47f/0x2150 kernel/signal.c:2781
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: Unable to access opcode bytes at RIP 0x4665cf.
RSP: 002b:00007fc68dddd218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 000000000056bf68 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68
RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c
R13: 00007fff0986484f R14: 00007fc68dddd300 R15: 0000000000022000

Allocated by task 1:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:427 [inline]
____kasan_kmalloc mm/kasan/common.c:506 [inline]
____kasan_kmalloc mm/kasan/common.c:465 [inline]
__kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
kmalloc include/linux/slab.h:554 [inline]
kzalloc include/linux/slab.h:684 [inline]
nfc_llcp_register_device+0x45/0x9d0 net/nfc/llcp_core.c:1572
nfc_register_device+0x6d/0x360 net/nfc/core.c:1124
nfcsim_device_new+0x345/0x5c1 drivers/nfc/nfcsim.c:408
nfcsim_init+0x71/0x14d drivers/nfc/nfcsim.c:455
do_one_initcall+0x103/0x650 init/main.c:1226
do_initcall_level init/main.c:1299 [inline]
do_initcalls init/main.c:1315 [inline]
do_basic_setup init/main.c:1335 [inline]
kernel_init_freeable+0x63e/0x6c2 init/main.c:1537
kernel_init+0xd/0x1b8 init/main.c:1424
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 31485:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
____kasan_slab_free mm/kasan/common.c:360 [inline]
____kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367
kasan_slab_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:1562 [inline]
slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600
slab_free mm/slub.c:3161 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4213
local_release net/nfc/llcp_core.c:175 [inline]
kref_put include/linux/kref.h:65 [inline]
nfc_llcp_local_put net/nfc/llcp_core.c:183 [inline]
nfc_llcp_local_put+0x194/0x200 net/nfc/llcp_core.c:178
llcp_sock_destruct+0x81/0x150 net/nfc/llcp_sock.c:950
__sk_destruct+0x4b/0x900 net/core/sock.c:1795
sk_destruct+0xbd/0xe0 net/core/sock.c:1839
__sk_free+0xef/0x3d0 net/core/sock.c:1850
sk_free+0x78/0xa0 net/core/sock.c:1861
sock_put include/net/sock.h:1807 [inline]
llcp_sock_release+0x3c9/0x580 net/nfc/llcp_sock.c:644
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
exit_task_work include/linux/task_work.h:30 [inline]
do_exit+0xbfc/0x2a60 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
get_signal+0x47f/0x2150 kernel/signal.c:2781
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88801a106000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
2048-byte region [ffff88801a106000, ffff88801a106800)
The buggy address belongs to the page:
page:ffffea0000684000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a100
head:ffffea0000684000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010442000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff88801a105f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801a106000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801a106080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801a106100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801a106180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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syzbot

unread,
May 8, 2021, 10:03:17 AMMay 8
to da...@davemloft.net, ku...@kernel.org, linux-...@vger.kernel.org, net...@vger.kernel.org, syzkall...@googlegroups.com
syzbot has found a reproducer for the following issue on:

HEAD commit: 95aafe91 net: ethernet: ixp4xx: Support device tree probing
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15a8c01dd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=7668018815a66138
dashboard link: https://syzkaller.appspot.com/bug?extid=e4689b43d2ed2ed63611
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15ed2663d00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e4689b...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:931 [inline]
BUG: KASAN: use-after-free in __mutex_lock+0x1034/0x1120 kernel/locking/mutex.c:1096
Read of size 8 at addr ffff888143d92080 by task syz-executor.5/9920

CPU: 0 PID: 9920 Comm: syz-executor.5 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
__mutex_lock_common kernel/locking/mutex.c:931 [inline]
__mutex_lock+0x1034/0x1120 kernel/locking/mutex.c:1096
nfc_llcp_put_ssap+0x49/0x2e0 net/nfc/llcp_core.c:492
llcp_sock_release+0x1d2/0x580 net/nfc/llcp_sock.c:626
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x41940b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffcfd298030 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 000000000041940b
RDX: ffffffffffffffbc RSI: 0000000000000001 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b325200c4
R10: 00007ffcfd298120 R11: 0000000000000293 R12: 00000000000158d7
R13: 00000000000003e8 R14: 000000000056bf60 R15: 00000000000158c2

Allocated by task 1:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:427 [inline]
____kasan_kmalloc mm/kasan/common.c:506 [inline]
____kasan_kmalloc mm/kasan/common.c:465 [inline]
__kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
kmalloc include/linux/slab.h:554 [inline]
kzalloc include/linux/slab.h:684 [inline]
nfc_llcp_register_device+0x45/0x9d0 net/nfc/llcp_core.c:1572
nfc_register_device+0x6d/0x360 net/nfc/core.c:1124
nfcsim_device_new+0x345/0x5c1 drivers/nfc/nfcsim.c:408
nfcsim_init+0x71/0x14d drivers/nfc/nfcsim.c:455
do_one_initcall+0x103/0x650 init/main.c:1226
do_initcall_level init/main.c:1299 [inline]
do_initcalls init/main.c:1315 [inline]
do_basic_setup init/main.c:1335 [inline]
kernel_init_freeable+0x63e/0x6c2 init/main.c:1537
kernel_init+0xd/0x1b8 init/main.c:1424
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 9921:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
____kasan_slab_free mm/kasan/common.c:360 [inline]
____kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367
kasan_slab_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:1562 [inline]
slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600
slab_free mm/slub.c:3161 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4213
local_release net/nfc/llcp_core.c:175 [inline]
kref_put include/linux/kref.h:65 [inline]
nfc_llcp_local_put net/nfc/llcp_core.c:183 [inline]
nfc_llcp_local_put+0x194/0x200 net/nfc/llcp_core.c:178
llcp_sock_destruct+0x81/0x150 net/nfc/llcp_sock.c:950
__sk_destruct+0x4b/0x900 net/core/sock.c:1795
sk_destruct+0xbd/0xe0 net/core/sock.c:1839
__sk_free+0xef/0x3d0 net/core/sock.c:1850
sk_free+0x78/0xa0 net/core/sock.c:1861
sock_put include/net/sock.h:1813 [inline]
llcp_sock_release+0x3c9/0x580 net/nfc/llcp_sock.c:644
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888143d92000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
2048-byte region [ffff888143d92000, ffff888143d92800)
The buggy address belongs to the page:
page:ffffea00050f6400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x143d90
head:ffffea00050f6400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x57ff00000010200(slab|head)
raw: 057ff00000010200 dead000000000100 dead000000000122 ffff888010842000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff888143d91f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888143d92000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888143d92080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888143d92100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888143d92180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

syzbot

unread,
May 9, 2021, 3:52:08 PMMay 9
to ak...@linux-foundation.org, b...@alien8.de, da...@davemloft.net, h...@zytor.com, jmat...@google.com, jo...@8bytes.org, ku...@kernel.org, k...@vger.kernel.org, linux-...@vger.kernel.org, mark.r...@arm.com, masa...@kernel.org, mi...@redhat.com, net...@vger.kernel.org, pbon...@redhat.com, pet...@infradead.org, rafael.j...@intel.com, ros...@goodmis.org, sea...@google.com, syzkall...@googlegroups.com, tg...@linutronix.de, vkuz...@redhat.com, wanp...@tencent.com, wi...@kernel.org, x...@kernel.org
syzbot has bisected this issue to:

commit 997acaf6b4b59c6a9c259740312a69ea549cc684
Author: Mark Rutland <mark.r...@arm.com>
Date: Mon Jan 11 15:37:07 2021 +0000

lockdep: report broken irq restoration

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14af741dd00000
start commit: 95aafe91 net: ethernet: ixp4xx: Support device tree probing
git tree: net-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=16af741dd00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12af741dd00000
Reported-by: syzbot+e4689b...@syzkaller.appspotmail.com
Fixes: 997acaf6b4b5 ("lockdep: report broken irq restoration")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Cong Wang

unread,
May 11, 2021, 1:13:01 PMMay 11
to syzbot, David Miller, Jakub Kicinski, LKML, Linux Kernel Network Developers, syzkaller-bugs
#syz fix: net/nfc: fix use-after-free llcp_sock_bind/connect
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