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Commit 0fbdea19 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

perf_counter: Introduce new (non-)paranoia level to allow raw tracepoint access 



I want to sample inherited tracepoint workloads as a normal
user and the CAP_SYS_ADMIN check prevents me from doing that
right now.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f76bd108

kernel/perf_counter.c

+10 −3
Original line number Diff line number Diff line
@@ -46,12 +46,18 @@ static atomic_t nr_task_counters __read_mostly; 


/*

 * perf counter paranoia level:

 *  0 - not paranoid

 *  1 - disallow cpu counters to unpriv

 *  2 - disallow kernel profiling to unpriv

 *  -1 - not paranoid at all

 *   0 - disallow raw tracepoint access for unpriv

 *   1 - disallow cpu counters for unpriv

 *   2 - disallow kernel profiling for unpriv

 */

int sysctl_perf_counter_paranoid __read_mostly = 1;



static inline bool perf_paranoid_tracepoint_raw(void)

{

	return sysctl_perf_counter_paranoid > -1;

}



static inline bool perf_paranoid_cpu(void)

{

	return sysctl_perf_counter_paranoid > 0;
@@ -3971,6 +3977,7 @@ static const struct pmu *tp_perf_counter_init(struct perf_counter *counter) 
	 * have these.

	 */

	if ((counter->attr.sample_type & PERF_SAMPLE_RAW) &&

			perf_paranoid_tracepoint_raw() &&

			!capable(CAP_SYS_ADMIN))

		return ERR_PTR(-EPERM);