linux-ext4 - Re: [syzbot] [ext4?] KASAN: out-of-bounds Read in ext4_ext_remove

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Message-ID: <20240212132746.syu7dhttk7xsyhzp@quack3>
Date: Mon, 12 Feb 2024 14:27:46 +0100
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+6e5f2db05775244c73b7@...kaller.appspotmail.com>
Cc: achender@...ux.vnet.ibm.com, achender@...ibm.com,
	adilger.kernel@...ger.ca, alex@...sterfs.com, axboe@...nel.dk,
	brauner@...nel.org, jack@...e.cz, kernel@...labora.com,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	syzkaller-bugs@...glegroups.com, tytso@....edu,
	usama.anjum@...labora.com
Subject: Re: [syzbot] [ext4?] KASAN: out-of-bounds Read in
 ext4_ext_remove_space

On Sun 11-02-24 05:54:02, 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=1764f648180000
> start commit:   e6fda526d9db Merge tag 'arm64-fixes' of git://git.kernel.o..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1e3d5175079af5a4
> dashboard link: https://syzkaller.appspot.com/bug?extid=6e5f2db05775244c73b7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a56679a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d76b5da80000
> 
> If the result looks correct, please mark the issue as fixed by replying with:

Yes, the reproducer seems to be corrupting the image:
 
#syz fix: fs: Block writes to mounted block devices

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