linux-kernel - Re: Re: [SECURITY] ext4: KASAN use-after-free and Oops in ext4_xattr_set

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Message-ID: <2025110602-display-remodeler-80f0@gregkh>
Date: Thu, 6 Nov 2025 17:50:35 +0900
From: Greg KH <greg@...ah.com>
To: 章怿贺 <12421252@....edu.cn>
Cc: security@...nel.org, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Re: [SECURITY] ext4: KASAN use-after-free and Oops in
 ext4_xattr_set_entry with crafted ext4 image

On Thu, Nov 06, 2025 at 04:45:14PM +0800, 章怿贺 wrote:
> Hi Greg,
> 
> Thank you for your explanation and suggestions.  

Please always cc: everyone on the emails, direct emails don't scale :)

> I ran e2fsck -fn on the extracted image and it does report errors
> (including “padding at end of block bitmap is not set”), so it seems
> fsck already detects the corruption. Next time I will evaluate the
> impact more carefully before contacting the Linux community again.

That's great to hear, but I'm sure the ext4 developers would still
appreciate a kernel patch for this if you have one :)

thanks,

greg k-h