linux-ext4 - Re: KASAN: use-after-free in ext4_find

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Message-ID: <20240516135821.GA272071@mit.edu>
Date: Thu, 16 May 2024 07:58:21 -0600
From: "Theodore Ts'o" <tytso@....edu>
To: Shuangpeng Bai <shuangpengbai@...il.com>
Cc: linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller@...glegroups.com
Subject: Re: KASAN: use-after-free in ext4_find_extent in v6.9

On Wed, May 15, 2024 at 08:33:33PM -0400, Shuangpeng Bai wrote:
> 
> You are right. I disabled CONFIG_BLK_DEV_WRITE_MOUNTED and found
> this bug can not be triggered anymore.
> 
> I am wondering if there is any suggested way for me to check whether
> a bug is reproduced under a reasonable environment (such as
> compiling config) or not? If so, that would be very helpful.

As I mentioned, the upstream syzkaller always forces the
CONFIG_BLK_DEV_WRITE_MOUNTED to be disabled.  That's the best way to
check whether the bug is reproducible under a reasonable environment,
and to do it in an automated way.

Cheers,

					- Ted