linux-kernel - Re: [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE

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Message-ID: <1267693087.25158.148.camel@laptop>
Date:	Thu, 04 Mar 2010 09:58:07 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, paulus@...ba.org,
	eranian@...gle.com, robert.richter@....com
Subject: Re: [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE_REGS

On Wed, 2010-03-03 at 23:02 +0100, Frederic Weisbecker wrote:
> On Wed, Mar 03, 2010 at 05:39:43PM +0100, Peter Zijlstra wrote:
> > Simply copy out the provided pt_regs in a u64 aligned fashion.
> > 
> > XXX: do task_pt_regs() and get_irq_regs() always clear everything or
> >      are we now leaking data?
> 
> 
> It looks like there is a leak in case of non trace syscalls.
> where we don't appear to save r12-15.
> 
> Then task_pt_regs() may leak the top of a process stack...?


Right, I was afraid of that. I've put this PERF_SAMPLE_REGS thing in the
freezer for now as people seem unsure how to deal with it.

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