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Date: Fri, 28 Aug 2009 11:51:57 GMT
From: tip-bot for Ingo Molnar <mingo@elte.hu>
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To: linux-tip-commits@vger.kernel.org
Subject: [tip:perfcounters/urgent] perf_counters: Increase paranoia level
Message-ID: <tip-6bb56347f5162d1a7cb1dc461023360781ecd4c0@git.kernel.org>
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Commit-ID:  6bb56347f5162d1a7cb1dc461023360781ecd4c0
Gitweb:     http://git.kernel.org/tip/6bb56347f5162d1a7cb1dc461023360781ecd4c0
Author:     Ingo Molnar <mingo@elte.hu>
AuthorDate: Fri, 28 Aug 2009 13:44:53 +0200
Committer:  Ingo Molnar <mingo@elte.hu>
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@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 |    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)
 {