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Message-ID: <00000000000066926e05e657af2b@google.com>
Date: Tue, 16 Aug 2022 01:39:22 -0700
From: syzbot <syzbot+0c48c24994617c1e1c7a@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
rafael@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] upstream boot error: BUG: unable to handle kernel paging
request in get_kobj_path_length
Hello,
syzbot found the following issue on:
HEAD commit: 4a9350597aff Merge tag 'sound-fix-6.0-rc1' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10814197080000
kernel config: https://syzkaller.appspot.com/x/.config?x=5d647c9572405910
dashboard link: https://syzkaller.appspot.com/bug?extid=0c48c24994617c1e1c7a
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0c48c24994617c1e1c7a@...kaller.appspotmail.com
BUG: unable to handle page fault for address: ffffffff00007c61
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD bc8f067 P4D bc8f067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 2973 Comm: udevadm Not tainted 5.19.0-syzkaller-14090-g4a9350597aff #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:strlen+0x2c/0x90 lib/string.c:487
Code: 00 00 00 00 00 fc ff df 48 89 fa 55 48 89 fd 48 c1 ea 03 53 48 83 ec 08 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 48 <80> 7d 00 00 74 39 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0
RSP: 0018:ffffc90003067ad8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801c063000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff84204670 RDI: ffffffff00007c61
RBP: ffffffff00007c61 R08: 0000000000002000 R09: 0000000000000dc0
R10: 0000000080000000 R11: 000000000008c07c R12: 0000000000000001
R13: dffffc0000000000 R14: 00000000fffffffe R15: ffff8880170c2000
FS: 00007f2a81ab9840(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00007c61 CR3: 000000007c7ce000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__fortify_strlen include/linux/fortify-string.h:141 [inline]
get_kobj_path_length+0x28/0x90 lib/kobject.c:109
kobject_get_path+0x1b/0x70 lib/kobject.c:144
kobject_uevent_env+0x254/0x1640 lib/kobject_uevent.c:529
kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208
uevent_store+0x42/0x90 drivers/base/bus.c:581
drv_attr_store+0x6d/0xa0 drivers/base/bus.c:77
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x3f8/0x610 fs/kernfs/file.c:354
call_write_iter include/linux/fs.h:2192 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x9e9/0xdd0 fs/read_write.c:578
ksys_write+0x127/0x250 fs/read_write.c:631
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2a817259a3
Code: 8b 15 d9 f4 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18
RSP: 002b:00007fff9a55acc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fff9a55bf41 RCX: 00007f2a817259a3
RDX: 0000000000000003 RSI: 00007fff9a55bf41 RDI: 0000000000000003
RBP: 00005647bb783e80 R08: 0000000000000000 R09: 00007f2a817f5a60
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fff9a55acd8 R14: 0000000000000000 R15: 00005647bb1660b4
</TASK>
Modules linked in:
CR2: ffffffff00007c61
---[ end trace 0000000000000000 ]---
RIP: 0010:strlen+0x2c/0x90 lib/string.c:487
Code: 00 00 00 00 00 fc ff df 48 89 fa 55 48 89 fd 48 c1 ea 03 53 48 83 ec 08 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 48 <80> 7d 00 00 74 39 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0
RSP: 0018:ffffc90003067ad8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801c063000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff84204670 RDI: ffffffff00007c61
RBP: ffffffff00007c61 R08: 0000000000002000 R09: 0000000000000dc0
R10: 0000000080000000 R11: 000000000008c07c R12: 0000000000000001
R13: dffffc0000000000 R14: 00000000fffffffe R15: ffff8880170c2000
FS: 00007f2a81ab9840(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00007c61 CR3: 000000007c7ce000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 7 bytes skipped:
0: df 48 89 fisttps -0x77(%rax)
3: fa cli
4: 55 push %rbp
5: 48 89 fd mov %rdi,%rbp
8: 48 c1 ea 03 shr $0x3,%rdx
c: 53 push %rbx
d: 48 83 ec 08 sub $0x8,%rsp
11: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax
15: 48 89 fa mov %rdi,%rdx
18: 83 e2 07 and $0x7,%edx
1b: 38 d0 cmp %dl,%al
1d: 7f 04 jg 0x23
1f: 84 c0 test %al,%al
21: 75 48 jne 0x6b
* 23: 80 7d 00 00 cmpb $0x0,0x0(%rbp) <-- trapping instruction
27: 74 39 je 0x62
29: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx
30: fc ff df
33: 48 89 e8 mov %rbp,%rax
36: 48 rex.W
37: 83 .byte 0x83
38: c0 .byte 0xc0
---
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 syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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