linux-kernel - Re: [perf] more perf_fuzzer memory corruption

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Message-ID: <20140501102602.GP11096@twins.programming.kicks-ass.net>
Date:	Thu, 1 May 2014 12:26:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [perf] more perf_fuzzer memory corruption

On Thu, May 01, 2014 at 12:51:33AM +0200, Thomas Gleixner wrote:
> And that's the issue which puzzles us. Let's look at what we expect:
> 
> Now the trace shows a different story:
> 
>      perf_fuzzer-4387  [001]  1802.628659: sys_enter:            NR 298 (69bb58, 0, ffffffff, 12, 0, 0)

That's a per-cpu event (.pid = -1, .cpu = 12), they don't get inherited,
so the only thing keeping it alive is the fd the child got. So
exit_files() killing this thing makes perfect sense.

Onwards to find another funny.


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