linux-kernel - Re: [syzbot] BUG: unable to handle kernel paging request in path

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Message-ID: <0000000000002a15a005efdcbab1@google.com>
Date:   Thu, 15 Dec 2022 04:09:38 -0800
From:   syzbot <syzbot+59a66cac604a6b49ecce@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] BUG: unable to handle kernel paging request in path_openat

syzbot has found a reproducer for the following issue on:

HEAD commit:    041fae9c105a Merge tag 'f2fs-for-6.2-rc1' of git://git.ker..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=154d4400480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bc96ce6808e37967
dashboard link: https://syzkaller.appspot.com/bug?extid=59a66cac604a6b49ecce
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=104af21b880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15b91d77880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/09a117be80ce/disk-041fae9c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ac71ead731f7/vmlinux-041fae9c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f39b53cf5591/bzImage-041fae9c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/fc2c06c4a4bb/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+59a66cac604a6b49ecce@...kaller.appspotmail.com

ntfs: (device loop0): check_windows_hibernation_status(): Failed to find inode number for hiberfil.sys.
ntfs: (device loop0): load_system_files(): Failed to determine if Windows is hibernated.  Mounting read-only.  Run chkdsk.
ntfs: (device loop0): ntfs_lookup(): ntfs_lookup_ino_by_name() failed with error code 16777149.
BUG: unable to handle page fault for address: ffffffffff0000ab
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD d08f067 P4D d08f067 PUD d091067 PMD d0b1067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5072 Comm: syz-executor156 Not tainted 6.1.0-syzkaller-10971-g041fae9c105a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:lookup_open fs/namei.c:3405 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3481 [inline]
RIP: 0010:path_openat+0x1147/0x2dd0 fs/namei.c:3711
Code: 48 89 d8 48 89 5c 24 10 48 83 c3 68 49 89 de 49 c1 ee 03 43 80 3c 26 00 74 08 48 89 df e8 61 7c ed ff 48 89 9c 24 c0 00 00 00 <4c> 8b 23 8b 9c 24 80 00 00 00 83 e3 40 31 ff 89 de e8 63 e6 97 ff
RSP: 0018:ffffc90003bcf940 EFLAGS: 00010246
RAX: ffffffffff000043 RBX: ffffffffff0000ab RCX: 0000000003bcf803
RDX: 0000000000000001 RSI: ffffffff8aedc900 RDI: ffffffff8b4bbba0
RBP: ffffc90003bcfb70 R08: dffffc0000000000 R09: fffffbfff1d30a3e
R10: fffffbfff1d30a3e R11: 1ffffffff1d30a3d R12: dffffc0000000000
R13: ffffc90003bcfbc0 R14: 1fffffffffe00015 R15: 1ffff1100e6b97a0
FS:  00005555572d3300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff0000ab CR3: 0000000027baf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_filp_open+0x264/0x4f0 fs/namei.c:3741
 do_sys_openat2+0x124/0x4e0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_creat fs/open.c:1402 [inline]
 __se_sys_creat fs/open.c:1396 [inline]
 __x64_sys_creat+0x11f/0x160 fs/open.c:1396
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa47a6ba749
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe9f456828 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007fa47a6ba749
RDX: 00007fa47a678dc3 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 00007fa47a679fe0 R08: 000000000001ee42 R09: 0000000000000000
R10: 00007ffe9f4566f0 R11: 0000000000000246 R12: 00007fa47a67a070
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
CR2: ffffffffff0000ab
---[ end trace 0000000000000000 ]---
RIP: 0010:lookup_open fs/namei.c:3405 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3481 [inline]
RIP: 0010:path_openat+0x1147/0x2dd0 fs/namei.c:3711
Code: 48 89 d8 48 89 5c 24 10 48 83 c3 68 49 89 de 49 c1 ee 03 43 80 3c 26 00 74 08 48 89 df e8 61 7c ed ff 48 89 9c 24 c0 00 00 00 <4c> 8b 23 8b 9c 24 80 00 00 00 83 e3 40 31 ff 89 de e8 63 e6 97 ff
RSP: 0018:ffffc90003bcf940 EFLAGS: 00010246
RAX: ffffffffff000043 RBX: ffffffffff0000ab RCX: 0000000003bcf803
RDX: 0000000000000001 RSI: ffffffff8aedc900 RDI: ffffffff8b4bbba0
RBP: ffffc90003bcfb70 R08: dffffc0000000000 R09: fffffbfff1d30a3e
R10: fffffbfff1d30a3e R11: 1ffffffff1d30a3d R12: dffffc0000000000
R13: ffffc90003bcfbc0 R14: 1fffffffffe00015 R15: 1ffff1100e6b97a0
FS:  00005555572d3300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff0000ab CR3: 0000000027baf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 89 d8             	mov    %rbx,%rax
   3:	48 89 5c 24 10       	mov    %rbx,0x10(%rsp)
   8:	48 83 c3 68          	add    $0x68,%rbx
   c:	49 89 de             	mov    %rbx,%r14
   f:	49 c1 ee 03          	shr    $0x3,%r14
  13:	43 80 3c 26 00       	cmpb   $0x0,(%r14,%r12,1)
  18:	74 08                	je     0x22
  1a:	48 89 df             	mov    %rbx,%rdi
  1d:	e8 61 7c ed ff       	callq  0xffed7c83
  22:	48 89 9c 24 c0 00 00 	mov    %rbx,0xc0(%rsp)
  29:	00
* 2a:	4c 8b 23             	mov    (%rbx),%r12 <-- trapping instruction
  2d:	8b 9c 24 80 00 00 00 	mov    0x80(%rsp),%ebx
  34:	83 e3 40             	and    $0x40,%ebx
  37:	31 ff                	xor    %edi,%edi
  39:	89 de                	mov    %ebx,%esi
  3b:	e8 63 e6 97 ff       	callq  0xff97e6a3