[sanitizers] Fix get_groups interceptor in sanitizer (https://reviews.llvm.org/D31332, patch by Martin Liška)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299036 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/msan/tests/msan_test.cc b/lib/msan/tests/msan_test.cc
index 6f4dd99b3..59c40d384 100644
--- a/lib/msan/tests/msan_test.cc
+++ b/lib/msan/tests/msan_test.cc
@@ -3502,6 +3502,21 @@ TEST(MemorySanitizer, getgroups) {
     EXPECT_NOT_POISONED(gids[i]);
 }
 
+TEST(MemorySanitizer, getgroups_zero) {
+  gid_t group;
+  int n = getgroups(0, &group);
+  ASSERT_GE(n, 0);
+}
+
+TEST(MemorySanitizer, getgroups_negative) {
+  gid_t group;
+  int n = getgroups(-1, 0);
+  ASSERT_EQ(-1, n);
+
+  n = getgroups(-1, 0);
+  ASSERT_EQ(-1, n);
+}
+
 TEST(MemorySanitizer, wordexp) {
   wordexp_t w;
   int res = wordexp("a b c", &w, 0);