Add stack canaries / strcpy tests.
Add a test to ensure that stack canaries are working
correctly. Since stack canaries aren't normally generated
on non-string functions, we have to enable stack-protector-all.
Add a test to ensure that an out of bounds strcpy generates
a runtime failure.
Change-Id: Id0d3e59fc4b9602da019e4d35c5c653e1a57fae4
diff --git a/tests/stack_protector_test.cpp b/tests/stack_protector_test.cpp
index 9d86506..9cf3c38 100644
--- a/tests/stack_protector_test.cpp
+++ b/tests/stack_protector_test.cpp
@@ -114,4 +114,24 @@
ASSERT_NE(0U, reinterpret_cast<uintptr_t>(__stack_chk_guard));
}
+/*
+ * When this function returns, the stack canary will be inconsistent
+ * with the previous value, which will generate a call to __stack_chk_fail(),
+ * eventually resulting in a SIGABRT.
+ *
+ * This must be marked with "__attribute__ ((noinline))", to ensure the
+ * compiler generates the proper stack guards around this function.
+ */
+__attribute__ ((noinline))
+static void do_modify_stack_chk_guard() {
+ __stack_chk_guard = (void *) 0x12345678;
+}
+
+// We have to say "DeathTest" here so gtest knows to run this test (which exits)
+// in its own process.
+TEST(stack_protector_DeathTest, modify_stack_protector) {
+ ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+ ASSERT_EXIT(do_modify_stack_chk_guard(), testing::KilledBySignal(SIGABRT), "");
+}
+
#endif