linux-kernel - Re: Closing on the CR2 leak bug

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Message-ID: <20140304190005.4b273410@gandalf.local.home>
Date:	Tue, 4 Mar 2014 19:00:05 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Closing on the CR2 leak bug

On Tue, 04 Mar 2014 15:44:26 -0800
"H. Peter Anvin" <hpa@...or.com> wrote:

> On 03/04/2014 03:41 PM, Steven Rostedt wrote:
> > 
> > The only other issue is if perf traces from function context and traces
> > the trace_do_page_fault() call. But other than that, sure, take Jiri's
> > patch.
> > 
> 
> Is there a known codepath on which that can happen?

I'm not sure. Jiri, is there a way we can trace userspace from
the ftrace function event? What would be the command to try? I know you
had a patch to prevent it, but is it currently possible?

-- Steve
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