perf evlist: Validate that mmap_pages is not too big
Amend perf_evlist__parse_mmap_pages() to check that the mmap_pages
entered via the --mmap_pages/-m option is not too big.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1382427258-17495-15-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 85c4c80..2ce92ec 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -698,7 +698,8 @@
int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
int unset __maybe_unused)
{
- unsigned int pages, val, *mmap_pages = opt->value;
+ unsigned int *mmap_pages = opt->value;
+ unsigned long pages, val;
size_t size;
static struct parse_tag tags[] = {
{ .tag = 'B', .mult = 1 },
@@ -709,12 +710,12 @@
};
val = parse_tag_value(str, tags);
- if (val != (unsigned int) -1) {
+ if (val != (unsigned long) -1) {
/* we got file size value */
pages = PERF_ALIGN(val, page_size) / page_size;
- if (!is_power_of_2(pages)) {
+ if (pages < (1UL << 31) && !is_power_of_2(pages)) {
pages = next_pow2(pages);
- pr_info("rounding mmap pages size to %u (%u pages)\n",
+ pr_info("rounding mmap pages size to %lu (%lu pages)\n",
pages * page_size, pages);
}
} else {
@@ -727,6 +728,11 @@
}
}
+ if (pages > UINT_MAX || pages > SIZE_MAX / page_size) {
+ pr_err("--mmap_pages/-m value too big\n");
+ return -1;
+ }
+
size = perf_evlist__mmap_size(pages);
if (!size) {
pr_err("--mmap_pages/-m value must be a power of two.");