Re: [syzbot] [jfs?] [fat?] general protection fault in txEnd

[Aleksandr Nogikh]

#syz set subsystems: jfs

On Sat, Dec 24, 2022 at 12:37 AM syzbot
<syzbot+1d096d31de6a0491b55e@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    aeba12b26c79 Merge tag 'nfsd-6.2-1' of git://git.kernel.or..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=17485bf0480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4d348fc1e0f483c9
> dashboard link: https://syzkaller.appspot.com/bug?extid=1d096d31de6a0491b55e
> 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=117aef10480000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15206090480000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/661fe33f851b/disk-aeba12b2.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/c938bdcf3ad0/vmlinux-aeba12b2.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e7f738de30b7/bzImage-aeba12b2.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/9ee3cffc6151/mount_0.gz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+1d096d31de6a0491b55e@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> ERROR: (device loop0): remounting filesystem as read-only
> general protection fault, probably for non-canonical address 0xdffffc0000000029: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000148-0x000000000000014f]
> CPU: 1 PID: 5116 Comm: syz-executor317 Not tainted 6.1.0-syzkaller-13781-gaeba12b26c79 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> RIP: 0010:txEnd+0x1dc/0x560 fs/jfs/jfs_txnmgr.c:534
> Code: 00 84 c0 0f 85 d8 02 00 00 66 41 89 1e 41 0f b7 c5 89 05 e7 5c 0b 0f 4c 8b 74 24 08 49 8d 9e 4c 01 00 00 48 89 d8 48 c1 e8 03 <42> 8a 04 20 84 c0 0f 85 c8 02 00 00 8b 2b 8d 75 ff 89 33 31 ff e8
> RSP: 0018:ffffc90003d5f9f0 EFLAGS: 00010203
> RAX: 0000000000000029 RBX: 000000000000014c RCX: 0000000000000000
> RDX: ffff88807eb93a80 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 1ffff920004c6227 R08: ffffffff830c3c2f R09: fffffbfff20fb43a
> R10: fffffbfff20fb43a R11: 1ffffffff20fb439 R12: dffffc0000000000
> R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000110
> FS:  00007f2738801700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f273fc23000 CR3: 000000007e7a4000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  add_missing_indices fs/jfs/jfs_dtree.c:2658 [inline]
>  jfs_readdir+0x277c/0x44b0 fs/jfs/jfs_dtree.c:3004
>  iterate_dir+0x257/0x5f0
>  __do_sys_getdents fs/readdir.c:286 [inline]
>  __se_sys_getdents+0x1db/0x4d0 fs/readdir.c:271
>  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: 0033:0x7f273fc76709
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 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 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f27388012f8 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
> RAX: ffffffffffffffda RBX: 00007f273fd017b0 RCX: 00007f273fc76709
> RDX: 000000000000004c RSI: 0000000020000100 RDI: 0000000000000004
> RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 61746f7571727375
> R13: 726765746e696f6e R14: 7261637369646f6e R15: 00007f273fd017b8
>  </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:txEnd+0x1dc/0x560 fs/jfs/jfs_txnmgr.c:534
> Code: 00 84 c0 0f 85 d8 02 00 00 66 41 89 1e 41 0f b7 c5 89 05 e7 5c 0b 0f 4c 8b 74 24 08 49 8d 9e 4c 01 00 00 48 89 d8 48 c1 e8 03 <42> 8a 04 20 84 c0 0f 85 c8 02 00 00 8b 2b 8d 75 ff 89 33 31 ff e8
> RSP: 0018:ffffc90003d5f9f0 EFLAGS: 00010203
> RAX: 0000000000000029 RBX: 000000000000014c RCX: 0000000000000000
> RDX: ffff88807eb93a80 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 1ffff920004c6227 R08: ffffffff830c3c2f R09: fffffbfff20fb43a
> R10: fffffbfff20fb43a R11: 1ffffffff20fb439 R12: dffffc0000000000
> R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000110
> FS:  00007f2738801700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f273fc23000 CR3: 000000007e7a4000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess):
>    0:   00 84 c0 0f 85 d8 02    add    %al,0x2d8850f(%rax,%rax,8)
>    7:   00 00                   add    %al,(%rax)
>    9:   66 41 89 1e             mov    %bx,(%r14)
>    d:   41 0f b7 c5             movzwl %r13w,%eax
>   11:   89 05 e7 5c 0b 0f       mov    %eax,0xf0b5ce7(%rip)        # 0xf0b5cfe
>   17:   4c 8b 74 24 08          mov    0x8(%rsp),%r14
>   1c:   49 8d 9e 4c 01 00 00    lea    0x14c(%r14),%rbx
>   23:   48 89 d8                mov    %rbx,%rax
>   26:   48 c1 e8 03             shr    $0x3,%rax
> * 2a:   42 8a 04 20             mov    (%rax,%r12,1),%al <-- trapping instruction
>   2e:   84 c0                   test   %al,%al
>   30:   0f 85 c8 02 00 00       jne    0x2fe
>   36:   8b 2b                   mov    (%rbx),%ebp
>   38:   8d 75 ff                lea    -0x1(%rbp),%esi
>   3b:   89 33                   mov    %esi,(%rbx)
>   3d:   31 ff                   xor    %edi,%edi
>   3f:   e8                      .byte 0xe8
>
>
> ---
> 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.
>
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> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
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