linux-kernel - Re: [syzbot] [ext4?] general protection fault in utf8nlookup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20240213104218.utvf3t2abfgqdhbb@quack3>
Date: Tue, 13 Feb 2024 11:42:18 +0100
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+9cf75dc581fb4307d6dd@...kaller.appspotmail.com>
Cc: adilger.kernel@...ger.ca, axboe@...nel.dk, brauner@...nel.org,
	ebiggers@...gle.com, ebiggers@...nel.org, jack@...e.cz,
	krisman@...labora.com, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com, twuufnxlz@...il.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] general protection fault in utf8nlookup

On Mon 12-02-24 16:24:03, 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=17547fd4180000
> start commit:   e42bebf6db29 Merge tag 'efi-fixes-for-v6.6-1' of git://git..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=df91a3034fe3f122
> dashboard link: https://syzkaller.appspot.com/bug?extid=9cf75dc581fb4307d6dd
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1374a174680000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12b12928680000
> 
> If the result looks correct, please mark the issue as fixed by replying with:

The reproducer definitely does weird stuff like mmapping the loop device.
So makes sense:

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

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