linux-kernel - Re: perf,arm -- another (different) fuzzer oops

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Date:	Wed, 7 Aug 2013 22:03:42 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Stephen Boyd <sboyd@...eaurora.org>
cc:	Will Deacon <will.deacon@....com>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"trinity@...r.kernel.org" <trinity@...r.kernel.org>
Subject: Re: perf,arm -- another (different) fuzzer oops

On Wed, 7 Aug 2013, Stephen Boyd wrote:

> Is config some really big value? It looks like config (or more
> specifically event->attr.config) is ecececec which is larger than 9
> (PERF_COUNT_HW_MAX). I'm fairly certain r4 is event->attr.type
> (PERF_TYPE_HARDWARE) and so we're out of bounds on that array access in
> armpmu_map_hw_event(). Does the below patch fix that?

Yes, it was big values in attr.config.  I managed to bisect down to a
simple test case, which is attached.  Oddly the test case has two events
before the oops happens; I should double check to make sure both are 
really necessary.

I'll try this patch and see if it fixes things, thanks.

Vince


View attachment "arm_perf_new_oops.c" of type "TEXT/x-csrc" (2138 bytes)