linux-ext4 - Re: [syzbot] [ext4?] KASAN: slab-use-after-free Read in ext4_convert_inline_data

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Date: Thu, 1 Feb 2024 10:18:24 +0100
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+db6caad9ebd2c8022b41@...kaller.appspotmail.com>
Cc: adilger.kernel@...ger.ca, axboe@...nel.dk, brauner@...nel.org,
	jack@...e.cz, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	nogikh@...gle.com, syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] KASAN: slab-use-after-free Read in
 ext4_convert_inline_data_nolock

On Thu 01-02-24 00:20:04, 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=1606d4ffe80000
> start commit:   3a93e40326c8 Merge tag 'for-linus' of git://git.kernel.org..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9c35b3803e5ad668
> dashboard link: https://syzkaller.appspot.com/bug?extid=db6caad9ebd2c8022b41
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11a2cd05c80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=158e1f29c80000
> 
> If the result looks correct, please mark the issue as fixed by replying with:

Yep, the reproducer seems to mess with the loop device itself.
 
#syz fix: fs: Block writes to mounted block devices

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