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perf_counters: Increase paranoia level

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Per-cpu counters are an ASLR information leak as they show
the execution other tasks do. Increase the paranoia level
to 1, which disallows per-cpu counters. (they still allow
counting/profiling of own tasks - and admin can profile
everything.)

Acked-by: 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: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-08-28 13:44:53 +02:00
parent 326ba5010a
commit 6bb56347f5
1 changed files with 1 additions and 1 deletions
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2
kernel/perf_counter.c
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@ -50,7 +50,7 @@ static atomic_t nr_task_counters __read_mostly;
* 1 - disallow cpu counters to unpriv
* 2 - disallow kernel profiling to unpriv
*/
int sysctl_perf_counter_paranoid __read_mostly;
int sysctl_perf_counter_paranoid __read_mostly = 1;
static inline bool perf_paranoid_cpu(void)
{