linux-kernel - Re: [PATCH] fork.c: copy_process(): fix cleanup WRT perf_event_free

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Date:	Mon, 29 Sep 2014 14:07:22 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Sylvain 'ythier' Hitier <sylvain.hitier@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vince Weaver <vincent.weaver@...ne.edu>
Subject: Re: [PATCH] fork.c: copy_process(): fix cleanup WRT
 perf_event_free_task()


* Peter Zijlstra <peterz@...radead.org> wrote:

> Subject: perf: Fix perf bug in fork()
> 
> Oleg noticed that a cleanup by Sylvain actually uncovered a bug; by
> calling perf_event_free_task() when failing sched_fork() we will not yet
> have done the memset() on ->perf_event_ctxp[] and will therefore try and
> 'free' the inherited contexts, which are still in use by the parent
> process. This is bad..
> 
> Suggested-by: Oleg Nesterov <oleg@...hat.com>
> Reported-by: Oleg Nesterov <oleg@...hat.com>
> Reported-by: Sylvain 'ythier' Hitier <sylvain.hitier@...il.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Could this fix a couple of fuzzer triggered perf crashes perhaps?

Thanks,

	Ingo
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