linux-kernel - Re: [PATCH RFC] pid: make setpgid() system call use RCU read-side critical section

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Message-ID: <10401.1283268689@redhat.com>
Date:	Tue, 31 Aug 2010 16:31:29 +0100
From:	David Howells <dhowells@...hat.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, eric.dumazet@...il.com, jslaby@...e.cz,
	jmorris@...ei.org
Subject: Re: [PATCH RFC] pid: make setpgid() system call use RCU read-side critical section

Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> It turns out that the setpgid() system call fails to enter an RCU
> read-side critical section before doing a PID-to-task_struct translation.
> This commit therefore does rcu_read_lock() before the translation, and
> also does rcu_read_unlock() after the last use of the returned pointer.
> 
> Reported-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

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