perf_counters: Increase paranoia level
authorIngo Molnar <mingo@elte.hu>
Fri, 28 Aug 2009 11:44:53 +0000 (13:44 +0200)
committerIngo Molnar <mingo@elte.hu>
Fri, 28 Aug 2009 11:44:53 +0000 (13:44 +0200)
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>
kernel/perf_counter.c

index f274e19598858979a3d9bf32b75fe1f62fce426a..7d4bb83b78cfd9ba454c10716bd178bf914bb1ab 100644 (file)
@@ -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)
 {