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

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Message-ID: <68122507.050a0220.3a872c.0001.GAE@google.com>
Date: Wed, 30 Apr 2025 06:26:31 -0700
From: syzbot <syzbot+13ba7f3e9a17f77250fe@...kaller.appspotmail.com>
To: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in jfs_statfs (3)

Hello,

syzbot found the following issue on:

HEAD commit:    c72692105976 Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=16b1f574580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2a6efb1b6b7e84ef
dashboard link: https://syzkaller.appspot.com/bug?extid=13ba7f3e9a17f77250fe
compiler:       Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bc4c947b6a4c/disk-c7269210.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/26198601f51b/vmlinux-c7269210.xz
kernel image: https://storage.googleapis.com/syzbot-assets/426ac395cf1d/Image-c7269210.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+13ba7f3e9a17f77250fe@...kaller.appspotmail.com

 ... Log Wrap ... Log Wrap ... Log Wrap ...
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/jfs/super.c:140:14
shift exponent 770 is too large for 64-bit type 's64' (aka 'long long')
CPU: 1 UID: 0 PID: 6605 Comm: syz.1.10 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 ubsan_epilogue+0x14/0x48 lib/ubsan.c:231
 __ubsan_handle_shift_out_of_bounds+0x2b0/0x34c lib/ubsan.c:492
 jfs_statfs+0x400/0x484 fs/jfs/super.c:140
 statfs_by_dentry fs/statfs.c:66 [inline]
 vfs_statfs+0x13c/0x2b0 fs/statfs.c:90
 ovl_check_namelen fs/overlayfs/super.c:388 [inline]
 ovl_get_upper fs/overlayfs/super.c:506 [inline]
 ovl_fill_super+0x5b8/0x2bac fs/overlayfs/super.c:1387
 vfs_get_super fs/super.c:1280 [inline]
 get_tree_nodev+0xb4/0x144 fs/super.c:1299
 ovl_get_tree+0x28/0x38 fs/overlayfs/params.c:701
 vfs_get_tree+0x90/0x28c fs/super.c:1759
 do_new_mount+0x228/0x814 fs/namespace.c:3879
 path_mount+0x5b4/0xde0 fs/namespace.c:4206
 do_mount fs/namespace.c:4219 [inline]
 __do_sys_mount fs/namespace.c:4430 [inline]
 __se_sys_mount fs/namespace.c:4407 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4407
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
---[ end trace ]---
read_mapping_page failed!
ERROR: (device loop1): txAbort: 

ERROR: (device loop1): remounting filesystem as read-only
overlayfs: failed to create directory ./file0/work (errno: 5); mounting read-only
overlayfs: failed to set uuid (/file2, err=-30); falling back to uuid=null.
netlink: 277 bytes leftover after parsing attributes in process `syz.1.10'.


---
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