Commit 6bb56347 authored Aug 28, 2009 by Ingo Molnar

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>

parent 326ba501

kernel/perf_counter.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)
		{