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 <[email protected]> Acked-by: Peter Zijlstra <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
jadonk · Jul 22, 2009 · 0dc3d52 · 0dc3d52
1 parent 61fe087
commit 0dc3d52
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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)