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Date: Sun, 22 Jan 2023 23:58:51 -0800
From: syzbot <syzbot+c1d0a03d305972dbbe14@...kaller.appspotmail.com>
To: davem@...emloft.net, dvyukov@...gle.com, edumazet@...gle.com,
hdanton@...a.com, krzysztof.kozlowski@...aro.org, kuba@...nel.org,
linma@....edu.cn, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, pabeni@...hat.com,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] BUG: corrupted list in nfc_llcp_register_device
syzbot has found a reproducer for the following issue on:
HEAD commit: 2475bf0250de Merge tag 'sched_urgent_for_v6.2_rc6' of git:..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=116dd0ac480000
kernel config: https://syzkaller.appspot.com/x/.config?x=23330449ad10b66f
dashboard link: https://syzkaller.appspot.com/bug?extid=c1d0a03d305972dbbe14
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15e4a789480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=100108fa480000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c1d0a03d305972dbbe14@...kaller.appspotmail.com
list_add corruption. prev->next should be next (ffff88802620c000), but was ffff88801d633000. (prev=ffffffff8e546e60).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:30!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 12187 Comm: syz-executor209 Not tainted 6.2.0-rc5-syzkaller-00013-g2475bf0250de #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:__list_add_valid.cold+0x56/0x58 lib/list_debug.c:30
Code: 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 c0 bc a6 8a e8 df 2c f0 ff 0f 0b 48 89 f1 48 c7 c7 40 bc a6 8a 4c 89 e6 e8 cb 2c f0 ff <0f> 0b 4c 89 e1 48 89 ee 48 c7 c7 a0 be a6 8a e8 b7 2c f0 ff 0f 0b
RSP: 0018:ffffc90026c577f0 EFLAGS: 00010282
RAX: 0000000000000075 RBX: ffff888026209000 RCX: 0000000000000000
RDX: ffff888012c20000 RSI: ffffffff816680ec RDI: fffff52004d8aef0
RBP: ffff888026209000 R08: 0000000000000075 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffff88802620c000
R13: ffff88802620c000 R14: 0000000000000000 R15: ffff88802620a140
FS: 0000000000000000(0000) GS:ffff88802c600000(0063) knlGS:0000000057a07380
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000200003c0 CR3: 000000002433d000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__list_add include/linux/list.h:69 [inline]
list_add include/linux/list.h:88 [inline]
nfc_llcp_register_device+0x7a8/0x9e0 net/nfc/llcp_core.c:1604
nfc_register_device+0x70/0x3b0 net/nfc/core.c:1124
nci_register_device+0x7cb/0xb50 net/nfc/nci/core.c:1257
virtual_ncidev_open+0x14f/0x230 drivers/nfc/virtual_ncidev.c:148
misc_open+0x37a/0x4a0 drivers/char/misc.c:165
chrdev_open+0x26a/0x770 fs/char_dev.c:414
do_dentry_open+0x6cc/0x13f0 fs/open.c:882
do_open fs/namei.c:3557 [inline]
path_openat+0x1bbc/0x2a50 fs/namei.c:3714
do_filp_open+0x1ba/0x410 fs/namei.c:3741
do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_compat_sys_openat fs/open.c:1386 [inline]
__se_compat_sys_openat fs/open.c:1384 [inline]
__ia32_compat_sys_openat+0x143/0x1f0 fs/open.c:1384
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7e6f549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ff98601c EFLAGS: 00000292 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000020000080
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: 0000000000008933 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid.cold+0x56/0x58 lib/list_debug.c:30
Code: 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 c0 bc a6 8a e8 df 2c f0 ff 0f 0b 48 89 f1 48 c7 c7 40 bc a6 8a 4c 89 e6 e8 cb 2c f0 ff <0f> 0b 4c 89 e1 48 89 ee 48 c7 c7 a0 be a6 8a e8 b7 2c f0 ff 0f 0b
RSP: 0018:ffffc90026c577f0 EFLAGS: 00010282
RAX: 0000000000000075 RBX: ffff888026209000 RCX: 0000000000000000
RDX: ffff888012c20000 RSI: ffffffff816680ec RDI: fffff52004d8aef0
RBP: ffff888026209000 R08: 0000000000000075 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffff88802620c000
R13: ffff88802620c000 R14: 0000000000000000 R15: ffff88802620a140
FS: 0000000000000000(0000) GS:ffff88802c600000(0063) knlGS:0000000057a07380
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000200003c0 CR3: 000000002433d000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi
4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d
a: 10 06 adc %al,(%rsi)
c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
10: 10 07 adc %al,(%rdi)
12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
16: 10 08 adc %cl,(%rax)
18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1c: 00 00 add %al,(%rax)
1e: 00 00 add %al,(%rax)
20: 00 51 52 add %dl,0x52(%rcx)
23: 55 push %rbp
24: 89 e5 mov %esp,%ebp
26: 0f 34 sysenter
28: cd 80 int $0x80
* 2a: 5d pop %rbp <-- trapping instruction
2b: 5a pop %rdx
2c: 59 pop %rcx
2d: c3 retq
2e: 90 nop
2f: 90 nop
30: 90 nop
31: 90 nop
32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
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