[syzbot] [autofs?] general protection fault in autofs_fill_super
From: syzbot
Date: Mon Nov 13 2023 - 20:02:36 EST
Hello,
syzbot found the following issue on:
HEAD commit: 4bbdb725a36b Merge tag 'iommu-updates-v6.7' of git://git.k..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15dc14a8e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=beb32a598fd79db9
dashboard link: https://syzkaller.appspot.com/bug?extid=662f87a8ef490f45fa64
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14384a7b680000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fd459eb1acfc/disk-4bbdb725.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d784829734e1/vmlinux-4bbdb725.xz
kernel image: https://storage.googleapis.com/syzbot-assets/db2c9e9ae9c3/bzImage-4bbdb725.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+662f87a8ef490f45fa64@xxxxxxxxxxxxxxxxxxxxxxxxx
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe4723a6f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fae5d99bf80 RCX: 00007fae5d87cae9
RDX: 0000000020000040 RSI: 0000000020000380 RDI: 0000000000000000
RBP: 00007ffe4723a750 R08: 0000000020000400 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00000000000009f9 R14: 00007fae5d99bf80 R15: 00007fae5d99bf80
</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: 5098 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller-15601-g4bbdb725a36b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:autofs_fill_super+0x47d/0xb50 fs/autofs/inode.c:334
Code: 03 60 d7 9f 8b 4d 8d 67 04 48 8b 14 24 48 89 d0 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 58 03 00 00 8b 1a 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 4c 89 f5 0f 85 61 03 00 00 41 89 5f 04 4d 8d
RSP: 0018:ffffc90003bafc90 EFLAGS: 00010247
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88807b190000
RDX: ffff8880136beac0 RSI: ffffffff8bbdc620 RDI: ffffffff8bbdc5e0
RBP: ffff8880206d0580 R08: ffffffff8da2aa13 R09: 1ffffffff1b45542
R10: dffffc0000000000 R11: fffffbfff1b45543 R12: 0000000000000004
R13: ffff8880206d0500 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000555555cbc480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe47239e08 CR3: 0000000024f32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
vfs_get_super fs/super.c:1338 [inline]
get_tree_nodev+0xb4/0x140 fs/super.c:1357
vfs_get_tree+0x8c/0x280 fs/super.c:1771
do_new_mount+0x28f/0xae0 fs/namespace.c:3337
do_mount fs/namespace.c:3677 [inline]
__do_sys_mount fs/namespace.c:3886 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3863
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fae5d87cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe4723a6f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fae5d99bf80 RCX: 00007fae5d87cae9
RDX: 0000000020000040 RSI: 0000000020000380 RDI: 0000000000000000
RBP: 00007ffe4723a750 R08: 0000000020000400 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00000000000009f9 R14: 00007fae5d99bf80 R15: 00007fae5d99bf80
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:autofs_fill_super+0x47d/0xb50 fs/autofs/inode.c:334
Code: 03 60 d7 9f 8b 4d 8d 67 04 48 8b 14 24 48 89 d0 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 58 03 00 00 8b 1a 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 4c 89 f5 0f 85 61 03 00 00 41 89 5f 04 4d 8d
RSP: 0018:ffffc90003bafc90 EFLAGS: 00010247
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88807b190000
RDX: ffff8880136beac0 RSI: ffffffff8bbdc620 RDI: ffffffff8bbdc5e0
RBP: ffff8880206d0580 R08: ffffffff8da2aa13 R09: 1ffffffff1b45542
R10: dffffc0000000000 R11: fffffbfff1b45543 R12: 0000000000000004
R13: ffff8880206d0500 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000555555cbc480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe47239e08 CR3: 0000000024f32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 28 00 sub %al,(%rax)
2: 00 00 add %al,(%rax)
4: 75 05 jne 0xb
6: 48 83 c4 28 add $0x28,%rsp
a: c3 ret
b: e8 e1 20 00 00 call 0x20f1
10: 90 nop
11: 48 89 f8 mov %rdi,%rax
14: 48 89 f7 mov %rsi,%rdi
17: 48 89 d6 mov %rdx,%rsi
1a: 48 89 ca mov %rcx,%rdx
1d: 4d 89 c2 mov %r8,%r10
20: 4d 89 c8 mov %r9,%r8
23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9
28: 0f 05 syscall
* 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
30: 73 01 jae 0x33
32: c3 ret
33: 48 c7 c1 b0 ff ff ff mov $0xffffffffffffffb0,%rcx
3a: f7 d8 neg %eax
3c: 64 89 01 mov %eax,%fs:(%rcx)
3f: 48 rex.W
---
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@xxxxxxxxxxxxxxxx.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, 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 report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup