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

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Message-ID: <20140502172731.GK30445@twins.programming.kicks-ass.net>
Date:	Fri, 2 May 2014 19:27:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [perf] more perf_fuzzer memory corruption

On Fri, May 02, 2014 at 12:43:17PM -0400, Vince Weaver wrote:
> On Fri, 2 May 2014, Peter Zijlstra wrote:
> 
> > In principle the vfs file refcounting should be responsible for that.
> > But I'll go over it in a bit.
> 
> The poll code is ancient and the C-parser in my head really can't handle 
> it very well.

Yeah, that code isn't my favourite part either..

> Anyway for completeness this is the kind of thing I'm seeing.
> The poll() manpage isn't very clear about what is supposed to happen if 
> you poll() on a closed file descriptor.

              POLLNVAL
                     Invalid request: fd not open (output only).

Seems applicable..


Also, could you send your entire diff this way so we're more or less
staring at the same code again?

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