linux-kernel - Re: [PATCH] ima: Fix use-after-free on a dentry's dname.name

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Message-ID: <36fa018559b8d68ac9d41826148e7d36c1ecf1ab.camel@linux.ibm.com>
Date: Thu, 28 Mar 2024 21:02:37 -0400
From: Mimi Zohar <zohar@...ux.ibm.com>
To: Stefan Berger <stefanb@...ux.ibm.com>, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, roberto.sassu@...wei.com,
        Al Viro
	 <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] ima: Fix use-after-free on a dentry's dname.name

On Fri, 2024-03-22 at 10:03 -0400, Stefan Berger wrote:
> ->d_name.name can change on rename and the earlier value can be freed;
> there are conditions sufficient to stabilize it (->d_lock on dentry,
> ->d_lock on its parent, ->i_rwsem exclusive on the parent's inode,
> rename_lock), but none of those are met at any of the sites. Take a stable
> snapshot of the name instead.
> 
> Link: https://lore.kernel.org/all/20240202182732.GE2087318@ZenIV/
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>

Thanks, Al, Stefan.

Mimi