[PATCH 4.4 38/57] perf tests: Avoid possible truncation with dirent->d_name + snprintf

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arnaldo Carvalho de Melo <a...@redhat.com>

commit 2e2bbc039fad9eabad6c4c1a473c8b2554cdd2d4 upstream.

Addressing a few cases spotted by a new warning in gcc 7:

  tests/parse-events.c: In function 'test_pmu_events':
  tests/parse-events.c:1790:39: error: '%s' directive output may be truncated 
writing up to 255 bytes into a region of size 90 [-Werror=format-truncation=]
     snprintf(name, MAX_NAME, "cpu/event=%s/u", ent->d_name);
                                       ^~
  In file included from /usr/include/stdio.h:939:0,
                   from /git/linux/tools/perf/util/map.h:9,
                   from /git/linux/tools/perf/util/symbol.h:7,
                   from /git/linux/tools/perf/util/evsel.h:10,
                   from tests/parse-events.c:3:
  /usr/include/bits/stdio2.h:64:10: note: '__builtin___snprintf_chk' output 
between 13 and 268 bytes into a destination of size 100
     return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          __bos (__s), __fmt, __va_arg_pack ());
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/parse-events.c:1798:29: error: '%s' directive output may be truncated 
writing up to 255 bytes into a region of size 100 [-Werror=format-truncation=]
     snprintf(name, MAX_NAME, "%s:u,cpu/event=%s/u", ent->d_name, ent->d_name);

Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: David Ahern <dsah...@gmail.com>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Wang Nan <wangn...@huawei.com>
Fixes: 945aea220bb8 ("perf tests: Move test objects into 'tests' directory")
Link: http://lkml.kernel.org/n/tip-ty4q2p8zp1dp3mskvubxs...@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 tools/perf/tests/parse-events.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -1727,15 +1727,14 @@ static int test_pmu_events(void)
        }
 
        while (!ret && (ent = readdir(dir))) {
-#define MAX_NAME 100
                struct evlist_test e;
-               char name[MAX_NAME];
+               char name[2 * NAME_MAX + 1 + 12 + 3];
 
                if (!strcmp(ent->d_name, ".") ||
                    !strcmp(ent->d_name, ".."))
                        continue;
 
-               snprintf(name, MAX_NAME, "cpu/event=%s/u", ent->d_name);
+               snprintf(name, sizeof(name), "cpu/event=%s/u", ent->d_name);
 
                e.name  = name;
                e.check = test__checkevent_pmu_events;
@@ -1743,11 +1742,10 @@ static int test_pmu_events(void)
                ret = test_event(&e);
                if (ret)
                        break;
-               snprintf(name, MAX_NAME, "%s:u,cpu/event=%s/u", ent->d_name, 
ent->d_name);
+               snprintf(name, sizeof(name), "%s:u,cpu/event=%s/u", 
ent->d_name, ent->d_name);
                e.name  = name;
                e.check = test__checkevent_pmu_events_mix;
                ret = test_event(&e);
-#undef MAX_NAME
        }
 
        closedir(dir);