[libFuzzer] make sure we use the feedback from std::string operator ==

llvm-svn: 292835

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/Fuzzer/test/CxxStringEqTest.cpp b/llvm/lib/Fuzzer/test/CxxStringEqTest.cpp
new file mode 100644
index 00000000000..9005ab8467b
--- /dev/null
+++ b/llvm/lib/Fuzzer/test/CxxStringEqTest.cpp
@@ -0,0 +1,24 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Simple test for a fuzzer. Must find a specific string
+// used in std::string operator ==.
+#include <cstdint>
+#include <cstdlib>
+#include <cstddef>
+#include <string>
+#include <iostream>
+
+static volatile int Sink;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  std::string Str((const char*)Data, Size);
+  bool Eq = Str == "FooBar";
+  Sink = Str == "123456";   // Try to confuse the fuzzer
+  if (Eq) {
+    std::cout << "BINGO; Found the target, exiting\n";
+    abort();
+  }
+  return 0;
+}
+