perf tools: Fix strlen() bug in perf_event__synthesize_event_type()
The event_type record has a max length for the event name. It's called MAX_EVENT_NAME. The name may be truncated to fit the max length. But the header.size still reflects the original name length. If that length is > MAX_EVENT_NAME, then the header.size field is bogus. Fix this by using the length of the name after the potential truncation. Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20120120094912.GA4882@quad Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -2105,7 +2105,7 @@ int perf_event__synthesize_event_type(struct perf_tool *tool,
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strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
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ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
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size = strlen(name);
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size = strlen(ev.event_type.event_type.name);
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size = ALIGN(size, sizeof(u64));
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ev.event_type.header.size = sizeof(ev.event_type) -
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(sizeof(ev.event_type.event_type.name) - size);
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