linux-kernel - Re: [patch 0/9] Fix various __task_cred related invalid RCU assumptions

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Date:	Fri, 11 Dec 2009 13:39:06 +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>
Subject: Re: [patch 0/9] Fix various __task_cred related invalid RCU assumptions

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

> While auditing the read_lock(&tasklist_lock) sites for a possible
> conversion to rcu-read_lock() I stumbled over an unprotected user of
> __task_cred in kernel/sys.c

I'm sure last time I looked, spinlock primitives implied RCU read locks.
Maybe I was mistaken or maybe it's changed.  Whatever, good catch, Thomas!

Thanks,
David
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