linux-kernel - Re: [PATCH] capabilities: Use RCU to protect task lookup in sys

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Message-ID: <alpine.LRH.2.00.0912101201590.19518@tundra.namei.org>
Date:	Thu, 10 Dec 2009 12:02:15 +1100 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] capabilities: Use RCU to protect task lookup in
 sys_capget

On Wed, 9 Dec 2009, Thomas Gleixner wrote:

> cap_get_target_pid() protects the task lookup with tasklist_lock.
> security_capget() is called under tasklist_lock as well but
> tasklist_lock does not protect anything there. The capabilities are
> protected by RCU already.
> 
> So tasklist_lock only protects the lookup and prevents the task going
> away, which can be done with rcu_read_lock() as well.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>


Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next


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