stdio.h: enable vs?printf clang FORTIFY_SOURCE

Enable FORTIFY_SOURCE protections under clang for the following
functions:

  * vsprintf
  * vsnprintf

and add unittests.

Change-Id: I90f8a27f7b202c78b5dd8ebf53050bf9e33496f7

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/fortify2_test_clang.cpp b/tests/fortify2_test_clang.cpp
index 7183bc0ce..83f57e8f4 100644
--- a/tests/fortify2_test_clang.cpp
+++ b/tests/fortify2_test_clang.cpp
@@ -19,6 +19,7 @@
 
 #include <gtest/gtest.h>
 #include <string.h>
+#include <stdarg.h>
 
 struct foo {
   char empty[0];
@@ -123,6 +124,49 @@ TEST(Fortify2_Clang_DeathTest, sprintf2_fortified) {
   ASSERT_EXIT(sprintf(buf, "aaaaa"), testing::KilledBySignal(SIGABRT), "");
 }
 
+static int vsprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+
+  va_start(va, fmt);
+  result = vsprintf(buf, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify2_Clang_DeathTest, vsprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify2_Clang_DeathTest, vsprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+static int vsnprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+  size_t size = atoi("11");
+
+  va_start(va, fmt);
+  result = vsnprintf(buf, size, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify2_Clang_DeathTest, vsnprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify2_Clang_DeathTest, vsnprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
 TEST(Fortify2_Clang_DeathTest, strncat_fortified) {
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];