linux-kernel - Re: perf/tracepoint: another fuzzer generated lockup

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Date:	Thu, 14 Nov 2013 18:14:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Dave Jones <davej@...hat.com>
Subject: Re: perf/tracepoint: another fuzzer generated lockup

On Thu, Nov 14, 2013 at 12:20:35PM -0500, Vince Weaver wrote:
> 
> possibly not an issue with your patch, but found in nearby code:
> 
> in perf_trace_init:
> 
>         int event_id = p_event->attr.config;
> 
> 	...
> 
>                 if (tp_event->event.type == event_id &&
> 
> 
> note that "attr.config" is 64-bit but "event_id" is only 32-bit,
> so things like 0xffffffff00000018 will map to irq_work_exit.

I will have a look.

> I'm not sure if your PERM code properly handles this case, I don't have 
> time to work through the macro-magic in your patch.

Can't blame you; took me a fair chunk of the day to come up with this.
That trace event stuff is horrid.
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