linux-kernel - [syzbot] [udf?] general protection fault in udf_read

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Message-ID: <66eefd0c.050a0220.3195df.0061.GAE@google.com>
Date: Sat, 21 Sep 2024 10:06:20 -0700
From: syzbot <syzbot+ddf8715339c89280b6fc@...kaller.appspotmail.com>
To: jack@...e.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [udf?] general protection fault in udf_read_folio

Hello,

syzbot found the following issue on:

HEAD commit:    a940d9a43e62 Merge tag 'soc-arm-6.12' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1099869f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1653f803fffa3848
dashboard link: https://syzkaller.appspot.com/bug?extid=ddf8715339c89280b6fc
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=14d53500580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=134c3fc7980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-a940d9a4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/371e11b6a9e5/vmlinux-a940d9a4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/920eb0c53785/bzImage-a940d9a4.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2a8d27ffca62/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ddf8715339c89280b6fc@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 1024
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
./file1: Can't lookup blockdev
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
CPU: 0 UID: 0 PID: 5113 Comm: syz-executor381 Not tainted 6.11.0-syzkaller-03917-ga940d9a43e62 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:file_inode include/linux/fs.h:1123 [inline]
RIP: 0010:udf_read_folio+0x2b/0xc0 fs/udf/inode.c:223
Code: 0f 1e fa 41 57 41 56 41 54 53 49 89 f6 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 e0 1d 75 fe 48 83 c3 68 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 c6 62 dc fe 49 c7 c7 e8 fe ff ff
RSP: 0018:ffffc9000179f9d8 EFLAGS: 00010202
RAX: 000000000000000d RBX: 0000000000000068 RCX: ffff888000eac880
RDX: 0000000000000000 RSI: ffffea000002ecc0 RDI: 0000000000000000
RBP: ffffc9000179fac0 R08: ffffea000002ecc7 R09: 1ffffd4000005d98
R10: dffffc0000000000 R11: ffffffff831f0c40 R12: dffffc0000000000
R13: 1ffffd4000005d99 R14: ffffea000002ecc0 R15: ffffea000002ecc8
FS:  0000555563e91380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f57a987fe00 CR3: 000000003dd1a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355
 do_read_cache_folio+0x134/0x820 mm/filemap.c:3796
 read_mapping_folio include/linux/pagemap.h:915 [inline]
 erofs_bread+0x499/0xd40 fs/erofs/data.c:41
 erofs_read_superblock fs/erofs/super.c:277 [inline]
 erofs_fc_fill_super+0x345/0x1770 fs/erofs/super.c:621
 vfs_get_super fs/super.c:1280 [inline]
 get_tree_nodev+0xb7/0x140 fs/super.c:1299
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 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: 0033:0x7f57b1c85309
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 1c 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:00007ffe09300b48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f57b1c85309
RDX: 00000000200005c0 RSI: 0000000020000580 RDI: 0000000020000540
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000004400
R10: 0000000000200000 R11: 0000000000000246 R12: 00007ffe09300b90
R13: 00007ffe09300bd0 R14: 0000000000080000 R15: 0000000000000003
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:file_inode include/linux/fs.h:1123 [inline]
RIP: 0010:udf_read_folio+0x2b/0xc0 fs/udf/inode.c:223
Code: 0f 1e fa 41 57 41 56 41 54 53 49 89 f6 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 e0 1d 75 fe 48 83 c3 68 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 c6 62 dc fe 49 c7 c7 e8 fe ff ff
RSP: 0018:ffffc9000179f9d8 EFLAGS: 00010202
RAX: 000000000000000d RBX: 0000000000000068 RCX: ffff888000eac880
RDX: 0000000000000000 RSI: ffffea000002ecc0 RDI: 0000000000000000
RBP: ffffc9000179fac0 R08: ffffea000002ecc7 R09: 1ffffd4000005d98
R10: dffffc0000000000 R11: ffffffff831f0c40 R12: dffffc0000000000
R13: 1ffffd4000005d99 R14: ffffea000002ecc0 R15: ffffea000002ecc8
FS:  0000555563e91380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f57a987fe00 CR3: 000000003dd1a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	0f 1e fa             	nop    %edx
   3:	41 57                	push   %r15
   5:	41 56                	push   %r14
   7:	41 54                	push   %r12
   9:	53                   	push   %rbx
   a:	49 89 f6             	mov    %rsi,%r14
   d:	48 89 fb             	mov    %rdi,%rbx
  10:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  17:	fc ff df
  1a:	e8 e0 1d 75 fe       	call   0xfe751dff
  1f:	48 83 c3 68          	add    $0x68,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 c6 62 dc fe       	call   0xfedc62ff
  39:	49 c7 c7 e8 fe ff ff 	mov    $0xfffffffffffffee8,%r15


---
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