perf tools: Pre-check sample size before parsing
Check that the total size of the sample fields having a fixed
size do not exceed the one of the whole event. This robustifies
the sample parsing.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 1023f67..17c1c3c 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -35,6 +35,22 @@
return perf_event__names[id];
}
+int perf_sample_size(u64 sample_type)
+{
+ u64 mask = sample_type & PERF_SAMPLE_MASK;
+ int size = 0;
+ int i;
+
+ for (i = 0; i < 64; i++) {
+ if ((mask << i) & 1)
+ size++;
+ }
+
+ size *= sizeof(u64);
+
+ return size;
+}
+
static struct perf_sample synth_sample = {
.pid = -1,
.tid = -1,