linux-kernel - Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFindBits

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Message-ID: <0000000000005cea8e061f5ef6da@google.com>
Date: Sat, 10 Aug 2024 19:16:20 -0700
From: syzbot <syzbot+e38d703eeb410b17b473@...kaller.appspotmail.com>
To: andrew.kanner@...il.com, ghandatmanas@...il.com, 
	jfs-discussion@...ts.sourceforge.net, juntong.deng@...look.com, 
	linux-kernel-mentees@...ts.linuxfoundation.org, linux-kernel@...r.kernel.org, 
	osmtendev@...il.com, rbrasga@....edu, shaggy@...nel.org, 
	skhan@...uxfoundation.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFindBits

syzbot has found a reproducer for the following issue on:

HEAD commit:    34ac1e82e5a7 Merge tag '6.11-rc2-smb3-client-fixes' of git..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15f035d9980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9358cc4a2e37fd30
dashboard link: https://syzkaller.appspot.com/bug?extid=e38d703eeb410b17b473
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=161cc96d980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15f899d9980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2c13802fbda4/disk-34ac1e82.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/74423353023b/vmlinux-34ac1e82.xz
kernel image: https://storage.googleapis.com/syzbot-assets/61da8b25f42a/bzImage-34ac1e82.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/4d2d380a51d6/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/53f5a740bbef/mount_2.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e38d703eeb410b17b473@...kaller.appspotmail.com

ERROR: (device loop0): remounting filesystem as read-only
jfs_rename: dtInsert returned -EIO
ERROR: (device loop0): dbAllocBits: leaf page corrupt
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:3025:47
shift exponent 32 is too large for 32-bit type 'u32' (aka 'unsigned int')
CPU: 0 UID: 0 PID: 5213 Comm: syz-executor267 Not tainted 6.11.0-rc2-syzkaller-00239-g34ac1e82e5a7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 dbFindBits+0x11a/0x1d0 fs/jfs/jfs_dmap.c:3025
 dbAllocDmapLev+0x1e9/0x4a0 fs/jfs/jfs_dmap.c:1985
 dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1364
 dbDiscardAG+0x352/0xa20 fs/jfs/jfs_dmap.c:1613
 jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:100
 jfs_ioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 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: 0033:0x7fbb2632d059
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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:00007ffe933950b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbb26376095 RCX: 00007fbb2632d059
RDX: 0000000020000080 RSI: 00000000c0185879 RDI: 0000000000000006
RBP: 00007fbb263a85f0 R08: 000055555ee264c0 R09: 000055555ee264c0
R10: 000055555ee264c0 R11: 0000000000000246 R12: 00007ffe933950e0
R13: 00007ffe93395308 R14: 431bde82d7b634db R15: 00007fbb2637603b
 </TASK>
---[ end trace ]---


---
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#syz test: git://repo/address.git branch-or-commit-hash
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