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| author | Ingo Molnar <mingo@elte.hu> | 2009-08-28 13:44:53 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-28 13:44:53 +0200 |
| commit | 6bb56347f5162d1a7cb1dc461023360781ecd4c0 (patch) | |
| tree | a2f1926c1ad68da16e05a2586645ca3de20ab7c5 /kernel/perf_counter.c | |
| parent | Linux 2.6.31-rc8 (diff) | |
| download | linux-6bb56347f5162d1a7cb1dc461023360781ecd4c0.tar.xz linux-6bb56347f5162d1a7cb1dc461023360781ecd4c0.zip | |
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>
Diffstat (limited to 'kernel/perf_counter.c')
| -rw-r--r-- | 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 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; * 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) { |