Commit-ID: 6bb56347f5162d1a7cb1dc461023360781ecd4c0 Gitweb: http://git.kernel.org/tip/6bb56347f5162d1a7cb1dc461023360781ecd4c0 Author: Ingo Molnar <mingo@xxxxxxx> AuthorDate: Fri, 28 Aug 2009 13:44:53 +0200 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Fri, 28 Aug 2009 13:44:53 +0200 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@xxxxxxxxx> Cc: Mike Galbraith <efault@xxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- kernel/perf_counter.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index f274e19..7d4bb83 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -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) { -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html