linux-kernel - Re: [syzbot] [jfs?] KASAN: slab-out-of-bounds Read in jfs

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Message-ID: <20240307093354.x2u5agzzl7awypvd@quack3>
Date: Thu, 7 Mar 2024 10:33:54 +0100
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+f328fbf8718edb712341@...kaller.appspotmail.com>
Cc: axboe@...nel.dk, brauner@...nel.org, jack@...e.cz,
	jfs-discussion@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, shaggy@...nel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] KASAN: slab-out-of-bounds Read in jfs_readdir

On Sun 03-03-24 19:53:03, 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=16b9e3ca180000
> start commit:   2772d7df3c93 Merge tag 'riscv-for-linus-6.5-rc2' of git://..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=6d0f369ef5fb88c9
> dashboard link: https://syzkaller.appspot.com/bug?extid=f328fbf8718edb712341
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10233f38a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11d35c1aa80000
> 
> If the result looks correct, please mark the issue as fixed by replying with:

Likely corrupted fs so that logdev == fsdev and this fixed it. We could
perhaps add some sanity checking but does anybody care enough about JFS?
 
#syz fix: fs: Block writes to mounted block devices

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