linux-kernel - Re: [syzbot] [jfs?] general protection fault in diRead (2)

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Message-ID: <000000000000c758e1061da2b880@google.com>
Date: Fri, 19 Jul 2024 17:16:22 -0700
From: syzbot <syzbot+8f731999dc47797f064f@...kaller.appspotmail.com>
To: brauner@...nel.org, eadavis@...com, jack@...e.cz, 
	jfs-discussion@...ts.sourceforge.net, jlayton@...nel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	samsun1006219@...il.com, shaggy@...nel.org, syzkaller-bugs@...glegroups.com, 
	xrivendell7@...il.com
Subject: Re: [syzbot] [jfs?] general protection fault in diRead (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    4305ca0087dd Merge tag 'scsi-misc' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=119980b1980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dfaf0ab1b18403fe
dashboard link: https://syzkaller.appspot.com/bug?extid=8f731999dc47797f064f
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=14d09349980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1748fa5e980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/dd4bd188fcdc/disk-4305ca00.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d60a35331483/vmlinux-4305ca00.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8a5740b15da1/bzImage-4305ca00.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/fb21716fe5a7/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8f731999dc47797f064f@...kaller.appspotmail.com

R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9841c06c
R13: 0000000000000001 R14: 431bde82d7b634db R15: 00007fff9841c0b0
 </TASK>
read_mapping_page failed!
jfs_mount_rw: diMount failed!
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000104: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000820-0x0000000000000827]
CPU: 0 PID: 5094 Comm: syz-executor169 Not tainted 6.10.0-syzkaller-09061-g4305ca0087dd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2662 [inline]
RIP: 0010:diRead+0x158/0xae0 fs/jfs/jfs_imap.c:316
Code: 8d 5d 80 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 a9 e5 d7 fe 4c 8b 2b 49 8d 9d 20 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 89 e5 d7 fe 4c 8b 3b 49 8d 5f 28
RSP: 0018:ffffc900020bf738 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000820 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffff88805a2bcdf0 R08: ffff88805a2bca97 R09: 1ffff1100b457952
R10: dffffc0000000000 R11: ffffed100b457953 R12: 0000000000000004
R13: 0000000000000000 R14: ffff88805a2bca88 R15: dffffc0000000000
FS:  00005555843c1380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f13f837b0f8 CR3: 000000005a8e8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_iget+0x8c/0x3b0 fs/jfs/inode.c:35
 jfs_lookup+0x226/0x410 fs/jfs/namei.c:1469
 __lookup_slow+0x28c/0x3f0 fs/namei.c:1718
 lookup_slow+0x53/0x70 fs/namei.c:1735
 walk_component+0x2e1/0x410 fs/namei.c:2039
 lookup_last fs/namei.c:2542 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2566
 filename_lookup+0x256/0x610 fs/namei.c:2595
 user_path_at+0x3a/0x60 fs/namei.c:3002
 do_mount fs/namespace.c:3809 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount+0x297/0x3c0 fs/namespace.c:3997
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f13f8304bd9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1b 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:00007fff9841c048 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff9841c070 RCX: 00007f13f8304bd9
RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007fff9841c090
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9841c06c
R13: 0000000000000001 R14: 431bde82d7b634db R15: 00007fff9841c0b0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2662 [inline]
RIP: 0010:diRead+0x158/0xae0 fs/jfs/jfs_imap.c:316
Code: 8d 5d 80 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 a9 e5 d7 fe 4c 8b 2b 49 8d 9d 20 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 89 e5 d7 fe 4c 8b 3b 49 8d 5f 28
RSP: 0018:ffffc900020bf738 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000820 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffff88805a2bcdf0 R08: ffff88805a2bca97 R09: 1ffff1100b457952
R10: dffffc0000000000 R11: ffffed100b457953 R12: 0000000000000004
R13: 0000000000000000 R14: ffff88805a2bca88 R15: dffffc0000000000
FS:  00005555843c1380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f13f837b0f8 CR3: 000000005a8e8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 5d 80             	lea    -0x80(%rbp),%ebx
   3:	48 89 d8             	mov    %rbx,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
   f:	74 08                	je     0x19
  11:	48 89 df             	mov    %rbx,%rdi
  14:	e8 a9 e5 d7 fe       	call   0xfed7e5c2
  19:	4c 8b 2b             	mov    (%rbx),%r13
  1c:	49 8d 9d 20 08 00 00 	lea    0x820(%r13),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 89 e5 d7 fe       	call   0xfed7e5c2
  39:	4c 8b 3b             	mov    (%rbx),%r15
  3c:	49 8d 5f 28          	lea    0x28(%r15),%rbx


---
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.