perf tests: Avoid possible truncation with dirent->d_name + snprintf

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.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: 945aea220bb8 ("perf tests: Move test objects into 'tests' directory")
Link: http://lkml.kernel.org/n/tip-ty4q2p8zp1dp3mskvubxskm5@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index 20c2e641c422..aa9276bfe3e9 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -1779,15 +1779,14 @@ 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];
 
                 /* Names containing . are special and cannot be used directly */
                 if (strchr(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;
@@ -1795,11 +1794,10 @@ 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);