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

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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>
This commit is contained in:
Frederic Weisbecker 2011-05-21 17:07:24 +02:00
parent c5fc472171
commit eac9eacee1
1 changed files with 7 additions and 0 deletions
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7
tools/perf/util/session.c
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@ -1007,6 +1007,13 @@ remap:
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)