linux-kernel - Re: [patch 6/9] signal: Fix racy access to __task_cred in kill_pid_info_as

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Message-ID: <13441.1260539627@redhat.com>
Date:	Fri, 11 Dec 2009 13:53:47 +0000
From:	David Howells <dhowells@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	dhowells@...hat.com, LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	Al Viro <viro@...iv.linux.org.uk>,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [patch 6/9] signal: Fix racy access to __task_cred in kill_pid_info_as_uid()

Thomas Gleixner <tglx@...utronix.de> wrote:

> kill_pid_info_as_uid() accesses __task_cred() without being in a RCU
> read side critical section. tasklist_lock is not protecting that when
> CONFIG_TREE_PREEMPT_RCU=y.
> 
> Convert the whole tasklist_lock section to rcu and use
> lock_task_sighand to prevent the exit race.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Acked-by: David Howells <dhowells@...hat.com>
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