add a fortified implementation of getcwd

Change-Id: Ice3e6d3e1ff07788305dc85f8ee4059baad5fac4
diff --git a/tests/fortify_test.cpp b/tests/fortify_test.cpp
index 664e057..8f66cc8 100644
--- a/tests/fortify_test.cpp
+++ b/tests/fortify_test.cpp
@@ -623,6 +623,12 @@
   ASSERT_FORTIFY(FD_ISSET(0, set));
 }
 
+TEST_F(DEATHTEST, getcwd_fortified) {
+  char buf[1];
+  size_t ct = atoi("2"); // prevent optimizations
+  ASSERT_FORTIFY(getcwd(buf, ct));
+}
+
 TEST_F(DEATHTEST, pread_fortified) {
   char buf[1];
   size_t ct = atoi("2"); // prevent optimizations