From 0dc3d523e8bc4718e0be2e4a742367d6e4be77cd Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@linux.intel.com>
Date: Tue, 21 Jul 2009 00:55:05 -0700
Subject: perf: fix stack data leak

the "reserved" field was not initialized to zero, resulting in 4 bytes
of stack data leaking to userspace....

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index a641eb7..7bc888d 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2665,6 +2665,7 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
 		header.size += sizeof(cpu_entry);
 
 		cpu_entry.cpu = raw_smp_processor_id();
+		cpu_entry.reserved = 0;
 	}
 
 	if (sample_type & PERF_SAMPLE_PERIOD)
-- 
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