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perf_counters: Increase paranoia level
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>
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@ -50,7 +50,7 @@ static atomic_t nr_task_counters __read_mostly;
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* 1 - disallow cpu counters to unpriv
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* 2 - disallow kernel profiling to unpriv
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*/
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int sysctl_perf_counter_paranoid __read_mostly;
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int sysctl_perf_counter_paranoid __read_mostly = 1;
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static inline bool perf_paranoid_cpu(void)
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{
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