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Message-ID: <000000000000eddce70604837929@google.com>
Date: Mon, 04 Sep 2023 00:29:52 -0700
From: syzbot <syzbot+24adf36b9fdc6531990f@...kaller.appspotmail.com>
To: andriy.shevchenko@...ux.intel.com, gregkh@...uxfoundation.org,
linux-kernel@...r.kernel.org, rafael@...nel.org,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [kernel?] general protection fault in loop_add
Hello,
syzbot found the following issue on:
HEAD commit: 92901222f83d Merge tag 'f2fs-for-6-6-rc1' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=126f7104680000
kernel config: https://syzkaller.appspot.com/x/.config?x=3bd57a1ac08277b0
dashboard link: https://syzkaller.appspot.com/bug?extid=24adf36b9fdc6531990f
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=162c4cd0680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1271eb2fa80000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/04bb6c9609f2/disk-92901222.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/99fe68c63200/vmlinux-92901222.xz
kernel image: https://storage.googleapis.com/syzbot-assets/819e0d3f2de3/bzImage-92901222.xz
The issue was bisected to:
commit d21fdd07cea418c0d98c8a15fc95b8b8970801e7
Author: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Date: Thu Aug 17 09:12:21 2023 +0000
driver core: Return proper error code when dev_set_name() fails
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=173bdf7ba80000
final oops: https://syzkaller.appspot.com/x/report.txt?x=14bbdf7ba80000
console output: https://syzkaller.appspot.com/x/log.txt?x=10bbdf7ba80000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+24adf36b9fdc6531990f@...kaller.appspotmail.com
Fixes: d21fdd07cea4 ("driver core: Return proper error code when dev_set_name() fails")
Code: 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 00 00 00 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:00000000ffe7399c EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004c80
RDX: 0000000099999999 RSI: 0000000000000006 RDI: 0000000000000000
RBP: 00000000000110e3 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5039 Comm: syz-executor104 Not tainted 6.5.0-syzkaller-11075-g92901222f83d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329
Code: 01 ae f7 48 8b 74 24 08 48 8b 14 24 eb 89 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03 53 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 51 0f b6 07 89
RSP: 0018:ffffc90003c77b40 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000
RBP: ffffc90003c77bd0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003c77bd0
R13: 0000000000000cc0 R14: ffff888014b88200 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b9800000(0063) knlGS:0000000057b48380
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007ffd37f99fd8 CR3: 0000000074d36000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kvasprintf_const+0x25/0x190 lib/kasprintf.c:45
kobject_set_name_vargs+0x5a/0x130 lib/kobject.c:272
kobject_add_varg lib/kobject.c:366 [inline]
kobject_add+0x12a/0x240 lib/kobject.c:424
device_add+0x290/0x1ac0 drivers/base/core.c:3560
device_add_disk+0x42a/0x11f0 block/genhd.c:456
add_disk include/linux/blkdev.h:735 [inline]
loop_add+0x87f/0xaf0 drivers/block/loop.c:2087
loop_control_ioctl+0x13a/0x630 drivers/block/loop.c:2210
__do_compat_sys_ioctl+0x2bf/0x330 fs/ioctl.c:972
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x61/0xe0 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: 0023:0xf7e62579
Code: 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 00 00 00 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:00000000ffe7399c EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004c80
RDX: 0000000099999999 RSI: 0000000000000006 RDI: 0000000000000000
RBP: 00000000000110e3 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:strchr+0x1b/0xb0 lib/string.c:329
Code: 01 ae f7 48 8b 74 24 08 48 8b 14 24 eb 89 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03 53 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 51 0f b6 07 89
RSP: 0018:ffffc90003c77b40 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000
RBP: ffffc90003c77bd0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003c77bd0
R13: 0000000000000cc0 R14: ffff888014b88200 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b9900000(0063) knlGS:0000000057b48380
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000055676ffba0b8 CR3: 0000000074d36000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
---
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.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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