1 files changed, 28 insertions, 0 deletions
diff --git a/compiler-rt/lib/msan/tests/msan_test.cc b/compiler-rt/lib/msan/tests/msan_test.cc
index e6923828ded..dd9669be052 100644
--- a/compiler-rt/lib/msan/tests/msan_test.cc
+++ b/compiler-rt/lib/msan/tests/msan_test.cc
@@ -1146,6 +1146,34 @@ TEST(MemorySanitizer, shmctl) {
   ASSERT_GT(res, -1);
 }
 
+TEST(MemorySanitizer, shmat) {
+  void *p = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
+                 MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+  ASSERT_NE(MAP_FAILED, p);
+
+  ((char *)p)[10] = *GetPoisoned<U1>();
+  ((char *)p)[4095] = *GetPoisoned<U1>();
+
+  int res = munmap(p, 4096);
+  ASSERT_EQ(0, res);
+
+  int id = shmget(IPC_PRIVATE, 4096, 0644 | IPC_CREAT);
+  ASSERT_GT(id, -1);
+
+  void *q = shmat(id, p, 0);
+  ASSERT_EQ(p, q);
+
+  EXPECT_NOT_POISONED(((char *)q)[0]);
+  EXPECT_NOT_POISONED(((char *)q)[10]);
+  EXPECT_NOT_POISONED(((char *)q)[4095]);
+
+  res = shmdt(q);
+  ASSERT_EQ(0, res);
+
+  res = shmctl(id, IPC_RMID, 0);
+  ASSERT_GT(res, -1);
+}
+
 TEST(MemorySanitizer, random_r) {
   int32_t x;
   char z[64];