From: Arjan van de Ven <arjan@linux.intel.com>
Date: Tue, 21 Jul 2009 07:55:05 +0000 (-0700)
Subject: perf: Fix stack data leak
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c9f73a3dd27e03411f18a58c0814d51392d2b17a;p=linux-beck.git

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>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 5c6fae4f43d8..ff854fd89a81 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2666,6 +2666,7 @@ 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)