Commit eac9eace authored May 21, 2011 by Frederic Weisbecker

perf tools: Check we are able to read the event size on mmap

Check we have enough mmaped space to read the current event
size from its headers, otherwise we may dereference some
hell there.

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>

parent c5fc4721

tools/perf/util/session.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -1007,6 +1007,13 @@ int __perf_session__process_events(struct perf_session *session,
		file_pos = file_offset + head;

		more:
		/*
		* Ensure we have enough space remaining to read
		* the size of the event in the headers.
		*/
		if (head + sizeof(event->header) > mmap_size)
		goto remap;

		event = (union perf_event *)(buf + head);

		if (session->header.needs_swap)