linux-kernel - Re: [syzbot] [f2fs?] UBSAN: array-index-out-of-bounds in read_inline

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Message-ID: <676864d5.050a0220.226966.002c.GAE@google.com>
Date: Sun, 22 Dec 2024 11:13:25 -0800
From: syzbot <syzbot+69f5379a1717a0b982a1@...kaller.appspotmail.com>
To: chao@...nel.org, jaegeuk@...nel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [f2fs?] UBSAN: array-index-out-of-bounds in read_inline_xattr

syzbot has found a reproducer for the following issue on:

HEAD commit:    bcde95ce32b6 Merge tag 'devicetree-fixes-for-6.13-1' of gi..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=116c0adf980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1234f097ee657d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=69f5379a1717a0b982a1
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=167f9f30580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=142d7cf8580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/be6d4de70f82/disk-bcde95ce.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/70993500a1e4/vmlinux-bcde95ce.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1018443184c5/bzImage-bcde95ce.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7e1b134be79c/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+69f5379a1717a0b982a1@...kaller.appspotmail.com

F2FS-fs (loop0): Failed to enable quota tracking (type=1, err=-22). Please run fsck to fix.
F2FS-fs (loop0): Cannot turn on quotas: error -22
F2FS-fs (loop0): Mounted with checkpoint version = 1b41e954
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/f2fs/f2fs.h:3292:19
index 18446744073709500059 is out of range for type '__le32[923]' (aka 'unsigned int[923]')
CPU: 0 UID: 0 PID: 5820 Comm: syz-executor178 Not tainted 6.13.0-rc3-syzkaller-00301-gbcde95ce32b6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429
 read_inline_xattr+0x273/0x280
 lookup_all_xattrs fs/f2fs/xattr.c:341 [inline]
 f2fs_getxattr+0x57b/0x13b0 fs/f2fs/xattr.c:533
 __vfs_getxattr+0x433/0x470 fs/xattr.c:423
 smk_fetch+0xb1/0x140 security/smack/smack_lsm.c:306
 smack_d_instantiate+0x749/0xa50 security/smack/smack_lsm.c:3615
 security_d_instantiate+0x107/0x1f0 security/security.c:4070
 d_splice_alias+0x6f/0x330 fs/dcache.c:3001
 f2fs_lookup+0x4ff/0x820 fs/f2fs/namei.c:523
 lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1692
 filename_create+0x297/0x540 fs/namei.c:4081
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4326
 __do_sys_mkdir fs/namei.c:4354 [inline]
 __se_sys_mkdir fs/namei.c:4352 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4352
 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: 0033:0x7f5566117ad7
Code: ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 53 00 00 00 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:00007fff7eab6a58 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5566117ad7
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020000180
RBP: 0000000020000180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7eab6af0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
---[ end trace ]---


---
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.