linux-kernel - Re: "possible deadlock in corrupted" in Linux kernel version 5.15.169

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Message-ID: <20250103152718.GA1284777@mit.edu>
Date: Fri, 3 Jan 2025 10:27:18 -0500
From: "Theodore Ts'o" <tytso@....edu>
To: cheung wall <zzqq0103.hey@...il.com>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: "possible deadlock in corrupted" in Linux kernel version 5.15.169

On Fri, Jan 03, 2025 at 03:37:31PM +0800, cheung wall wrote:
> Hello,
> 
> I am writing to report a potential vulnerability identified in the
> Linux Kernel version 5.15.169. This issue was discovered using our
> custom vulnerability discovery tool.

Do you have a reproducer?  If I had to guess, this was caused by a
maliciously fuzzed file system where the quota file was placed on the
orphaned file list.  We have checks for the more modern quota file
support (see the checks for EXT4_IGET_SPECIAL in fs/ext4/inode.c's
__ext4_iget() function), even for antedeluvian kernel versions such as
5.15, however so that's not it.

In any case, with a crazy old kernel version, and no reproducer, it's
not something we're likely to waste any time on.

    	      	    	      	    	     - Ted