linux-kernel - Re: [syzbot] [ntfs3?] UBSAN: shift-out-of-bounds in ntfs

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Message-ID: <20240306122155.yr6lse3yyaduo2db@quack3>
Date: Wed, 6 Mar 2024 13:21:55 +0100
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+4768a8f039aa677897d0@...kaller.appspotmail.com>
Cc: almaz.alexandrovich@...agon-software.com, anton@...era.com,
	axboe@...nel.dk, brauner@...nel.org, ghandatmanas@...il.com,
	gregkh@...uxfoundation.org, jack@...e.cz, linkinjeon@...nel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	linux-kernel@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net,
	lkp@...el.com, llvm@...ts.linux.dev, ntfs3@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev, syzkaller-bugs@...glegroups.com,
	syzkaller@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] UBSAN: shift-out-of-bounds in ntfs_iget

On Tue 05-03-24 12:21:02, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit 6f861765464f43a71462d52026fbddfc858239a5
> Author: Jan Kara <jack@...e.cz>
> Date:   Wed Nov 1 17:43:10 2023 +0000
> 
>     fs: Block writes to mounted block devices
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12be09f2180000
> start commit:   afead42fdfca Merge tag 'perf-tools-fixes-for-v6.4-2-2023-0..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=162cf2103e4a7453
> dashboard link: https://syzkaller.appspot.com/bug?extid=4768a8f039aa677897d0
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12da9bbd280000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=174e8115280000
> 
> If the result looks correct, please mark the issue as fixed by replying with:
 
The reproducer is just mounting the fs so I'm not sure what's happening
there. But since there's no working repro and this is ntfs3:

#syz fix: fs: Block writes to mounted block devices

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