linux-kernel - Re: [syzbot] [udf?] KMSAN: uninit-value in udf_update

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Date: Mon, 17 Jun 2024 15:39:48 +0200
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+d31185aa54170f7fc1f5@...kaller.appspotmail.com>
Cc: jack@...e.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [udf?] KMSAN: uninit-value in udf_update_tag

On Thu 28-12-23 02:34:28, syzbot wrote:
> syzbot found the following issue on:
> 
> HEAD commit:    861deac3b092 Linux 6.7-rc7
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=16e0171ae80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e0c7078a6b901aa3
> dashboard link: https://syzkaller.appspot.com/bug?extid=d31185aa54170f7fc1f5
> 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=17561579e80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1277e7a5e80000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/0ea60ee8ed32/disk-861deac3.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/6d69fdc33021/vmlinux-861deac3.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/f0158750d452/bzImage-861deac3.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/f35551f8a991/mount_0.gz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d31185aa54170f7fc1f5@...kaller.appspotmail.com
> 
> =======================================================
> UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
> =====================================================
> BUG: KMSAN: uninit-value in crc_itu_t_byte include/linux/crc-itu-t.h:22 [inline]
> BUG: KMSAN: uninit-value in crc_itu_t+0x287/0x2e0 lib/crc-itu-t.c:60
>  crc_itu_t_byte include/linux/crc-itu-t.h:22 [inline]
>  crc_itu_t+0x287/0x2e0 lib/crc-itu-t.c:60
>  udf_update_tag+0x5c/0x2a0 fs/udf/misc.c:261
>  udf_rename+0x13dd/0x16a0 fs/udf/namei.c:877
>  vfs_rename+0x1a79/0x1fa0 fs/namei.c:4844
>  do_renameat2+0x1571/0x1ca0 fs/namei.c:4996
>  __do_sys_rename fs/namei.c:5042 [inline]
>  __se_sys_rename fs/namei.c:5040 [inline]
>  __x64_sys_rename+0xec/0x140 fs/namei.c:5040
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x63/0x6b
> 
> Local variable diriter created at:
>  udf_rename+0xbb/0x16a0 fs/udf/namei.c:768
>  vfs_rename+0x1a79/0x1fa0 fs/namei.c:4844
> 
> CPU: 0 PID: 5011 Comm: syz-executor409 Not tainted 6.7.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
> =====================================================
> 

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6ba59ff4227927d3a8530fc2973b80e94b54d58f

									Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR

View attachment "0001-udf-Fix-bogus-checksum-computation-in-udf_rename.patch" of type "text/x-patch" (1648 bytes)