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Message-ID: <69122a59.a70a0220.22f260.00fc.GAE@google.com>
Date: Mon, 10 Nov 2025 10:09:29 -0800
From: syzbot <syzbot+ab0ad25088673470d2d9@...kaller.appspotmail.com>
To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com,
linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ocfs2?] KASAN: use-after-free Read in ocfs2_listxattr
Hello,
syzbot found the following issue on:
HEAD commit: e424ed997df8 Merge remote-tracking branch 'will/for-next/p..
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=1739c412580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b8b659f0cab27b22
dashboard link: https://syzkaller.appspot.com/bug?extid=ab0ad25088673470d2d9
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1531aa92580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1361d084580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ada05b916921/disk-e424ed99.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/674414e6bfd1/vmlinux-e424ed99.xz
kernel image: https://storage.googleapis.com/syzbot-assets/67ca98bd56a6/Image-e424ed99.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/5d507ac2b3e1/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=11310412580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ab0ad25088673470d2d9@...kaller.appspotmail.com
On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted.
OCFS2: File system is now read-only.
==================================================================
BUG: KASAN: use-after-free in ocfs2_xattr_get_type fs/ocfs2/ocfs2_fs.h:1114 [inline]
BUG: KASAN: use-after-free in ocfs2_xattr_list_entries fs/ocfs2/xattr.c:934 [inline]
BUG: KASAN: use-after-free in ocfs2_xattr_ibody_list fs/ocfs2/xattr.c:982 [inline]
BUG: KASAN: use-after-free in ocfs2_listxattr+0x408/0xa74 fs/ocfs2/xattr.c:1044
Read of size 1 at addr ffff0000eba98007 by task syz.0.17/6724
CPU: 1 UID: 0 PID: 6724 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
print_address_description+0xa8/0x238 mm/kasan/report.c:378
print_report+0x68/0x84 mm/kasan/report.c:482
kasan_report+0xb0/0x110 mm/kasan/report.c:595
__asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
ocfs2_xattr_get_type fs/ocfs2/ocfs2_fs.h:1114 [inline]
ocfs2_xattr_list_entries fs/ocfs2/xattr.c:934 [inline]
ocfs2_xattr_ibody_list fs/ocfs2/xattr.c:982 [inline]
ocfs2_listxattr+0x408/0xa74 fs/ocfs2/xattr.c:1044
vfs_listxattr+0xc0/0x128 fs/xattr.c:493
ovl_listxattr+0xd8/0x49c fs/overlayfs/xattrs.c:123
vfs_listxattr fs/xattr.c:493 [inline]
listxattr+0x10c/0x380 fs/xattr.c:924
filename_listxattr fs/xattr.c:958 [inline]
path_listxattrat+0x15c/0x33c fs/xattr.c:988
__do_sys_listxattr fs/xattr.c:1001 [inline]
__se_sys_listxattr fs/xattr.c:998 [inline]
__arm64_sys_listxattr+0x84/0x98 fs/xattr.c:998
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffb730e pfn:0x12ba98
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffdffc3aeb708 fffffdffc3aeb888 0000000000000000
raw: 0000000ffffb730e 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000eba97f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff0000eba97f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000eba98000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff0000eba98080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff0000eba98100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
---
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@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
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.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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