From: Stephane Eranian Date: Fri, 20 Jan 2012 09:49:12 +0000 (+0100) Subject: perf tools: Fix strlen() bug in perf_event__synthesize_event_type() X-Git-Tag: v3.3-rc3~35^3^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d8d9c282a1abbe2baf6d22f959e6adf4c90629bf;p=platform%2Fkernel%2Flinux-exynos.git 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 Cc: Ingo Molnar Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20120120094912.GA4882@quad Signed-off-by: Stephane Eranian Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 3e7e0b0..ecd7f4d 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2105,7 +2105,7 @@ int perf_event__synthesize_event_type(struct perf_tool *tool, strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1); ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE; - size = strlen(name); + size = strlen(ev.event_type.event_type.name); size = ALIGN(size, sizeof(u64)); ev.event_type.header.size = sizeof(ev.event_type) - (sizeof(ev.event_type.event_type.name) - size);