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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>
This commit is contained in:
Arjan van de Ven 2009-07-21 00:55:05 -07:00 committed by Linus Torvalds
parent 61fe087059
commit 0dc3d523e8
1 changed files with 1 additions and 0 deletions
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kernel/perf_counter.c
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@ -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)