linux-kernel - Re: [RFC][PATCH 1/9] klp: Fix obvious RCU fail

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Message-ID: <alpine.LNX.2.00.1503012108270.9089@pobox.suse.cz>
Date:	Sun, 1 Mar 2015 21:09:24 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	mingo@...nel.org, rusty@...tcorp.com.au,
	mathieu.desnoyers@...icios.com, oleg@...hat.com,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	andi@...stfloor.org, rostedt@...dmis.org, tglx@...utronix.de,
	Seth Jennings <sjenning@...hat.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.cz>
Subject: Re: [RFC][PATCH 1/9] klp: Fix obvious RCU fail

On Sat, 28 Feb 2015, Peter Zijlstra wrote:

> While one must hold RCU-sched (aka. preempt_disable) for find_symbol()
> one must equally hold it over the use of the object returned.
> 
> The moment you release the RCU-sched read lock, the object can be dead
> and gone.
> 
> Cc: Seth Jennings <sjenning@...hat.com>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Miroslav Benes <mbenes@...e.cz>
> Cc: Petr Mladek <pmladek@...e.cz>
> Cc: Jiri Kosina <jkosina@...e.cz>
> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Acked-by: Jiri Kosina <jkosina@...e.cz>

I guess you'll be taking this together with the series, so I am not 
applying it.

Thanks,

-- 
Jiri Kosina
SUSE Labs
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