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authorIngo Molnar <mingo@elte.hu>2009-08-28 07:44:53 -0400
committerIngo Molnar <mingo@elte.hu>2009-08-28 07:44:53 -0400
commit6bb56347f5162d1a7cb1dc461023360781ecd4c0 (patch)
treea2f1926c1ad68da16e05a2586645ca3de20ab7c5
parent326ba5010a5429a5a528b268b36a5900d4ab0eba (diff)
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>
-rw-r--r--kernel/perf_counter.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index f274e1959885..7d4bb83b78cf 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -50,7 +50,7 @@ static atomic_t nr_task_counters __read_mostly;
50 * 1 - disallow cpu counters to unpriv 50 * 1 - disallow cpu counters to unpriv
51 * 2 - disallow kernel profiling to unpriv 51 * 2 - disallow kernel profiling to unpriv
52 */ 52 */
53int sysctl_perf_counter_paranoid __read_mostly; 53int sysctl_perf_counter_paranoid __read_mostly = 1;
54 54
55static inline bool perf_paranoid_cpu(void) 55static inline bool perf_paranoid_cpu(void)
56{ 56{