linux-kernel - Re: [PATCH v5 12/20] x86: perf: intel

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Date:	Fri, 24 Oct 2014 10:52:05 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Robert Richter <rric@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>, kan.liang@...el.com,
	adrian.hunter@...el.com, acme@...radead.org
Subject: Re: [PATCH v5 12/20] x86: perf: intel_pt: Intel PT PMU driver

Peter Zijlstra <peterz@...radead.org> writes:

> On Mon, Oct 13, 2014 at 04:45:40PM +0300, Alexander Shishkin wrote:
>> +static bool pt_event_valid(struct perf_event *event)
>> +{
>> +	u64 config = event->attr.config;
>> +
>> +	/* admin can set any packet generation parameters */
>> +	if (capable(CAP_SYS_ADMIN) && (config & PT_BYPASS_MASK) == config)
>> +		return true;
>> +
>> +	if ((config & PT_CONFIG_MASK) != config)
>> +		return false;
>> +
>> +	return true;
>> +}
>
> This seems to suggest PT is available to !priv users, is this right?

Yes, that's the intention. PT does CPL-based filtering in hardware and
unlike previous attempts at branch tracing, does not leak out-of-context
addresses (or any other information for that matter).

Regards,
--
Alex
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