Commit-ID: 98e1da905cbe64bb023a165c7c01eef5e800609e
Gitweb: http://git.kernel.org/tip/98e1da905cbe64bb023a165c7c01eef5e800609e
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Sat, 21 May 2011 20:08:15 +0200
Committer: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Sun, 22 May 2011 03:38:48 +0200
perf tools: Robustify dynamic sample content fetch
Ensure the size of the dynamic fields such as callchains
or raw events don't overlap the whole event boundaries.
This prevents from dereferencing junk if the given size of
the callchain goes too eager.
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Reported-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
---
tools/perf/util/evsel.c | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index bfce8bf..ee0fe0d 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -303,6 +303,17 @@ static int perf_event__parse_id_sample(const union perf_event *event, u64 type,
return 0;
}
+static bool sample_overlap(const union perf_event *event,
+ const void *offset, u64 size)
+{
+ const void *base = event;
+
+ if (offset + size > base + event->header.size)
+ return true;
+
+ return false;
+}
+
int perf_event__parse_sample(const union perf_event *event, u64 type,
int sample_size, bool sample_id_all,
struct perf_sample *data)
@@ -373,14 +384,29 @@ int perf_event__parse_sample(const union perf_event *event, u64 type,
}
if (type & PERF_SAMPLE_CALLCHAIN) {
+ if (sample_overlap(event, array, sizeof(data->callchain->nr)))
+ return -EFAULT;
+
data->callchain = (struct ip_callchain *)array;
+
+ if (sample_overlap(event, array, data->callchain->nr))
+ return -EFAULT;
+
array += 1 + data->callchain->nr;
}
if (type & PERF_SAMPLE_RAW) {
u32 *p = (u32 *)array;
+
+ if (sample_overlap(event, array, sizeof(u32)))
+ return -EFAULT;
+
data->raw_size = *p;
p++;
+
+ if (sample_overlap(event, p, data->raw_size))
+ return -EFAULT;
+
data->raw_data = p;
}
--
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