linux-kernel - Re: [PATCH] send_sigio_to_task: sanitize the usage of fown->signum

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Message-ID: <alpine.LRH.2.00.0906170859530.3185@tundra.namei.org>
Date:	Wed, 17 Jun 2009 09:00:13 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	Eugene Teo <eugene@...hat.com>,
	Roland McGrath <roland@...hat.com>, solar@...nwall.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] send_sigio_to_task: sanitize the usage of fown->signum

On Wed, 17 Jun 2009, Oleg Nesterov wrote:

> send_sigio_to_task() reads fown->signum several times, we can race with
> F_SETSIG which changes ->signum lockless. In theory, this can fool security
> checks or we can call group_send_sig_info() with the wrong ->si_signo which
> does not match "int sig".
> 
> Change the code to cache ->signum.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Reviewed-by: James Morris <jmorris@...ei.org>


-- 
James Morris
<jmorris@...ei.org>
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