[llvm-demangle-fuzzer] Add a fuzz target for ItaniumDemangler.

Patch By: hctim

Reviewers: morehouse, bogner

Reviewed By: bogner

Subscribers: bogner, kcc, llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D38855

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315716 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/FuzzingLLVM.rst b/docs/FuzzingLLVM.rst
index 5ac0ff8d5198b811eb2c22b371a18c70a1ac8b40..e6ebeaf80cb477c2f4b69dff5f404b5b033b7f4b 100644 (file)
--- a/docs/FuzzingLLVM.rst
+++ b/docs/FuzzingLLVM.rst
@@ -68,6 +68,13 @@ this fuzzer has reported are `on OSS Fuzz's tracker`__
 
 __ https://bugs.chromium.org/p/oss-fuzz/issues/list?q=proj-llvm+llvm-dwarfdump-fuzzer
 
+llvm-demangle-fuzzer
+---------------------
+
+A |generic fuzzer| for the Itanium demangler used in various LLVM tools. We've
+fuzzed __cxa_demangle to death, why not fuzz LLVM's implementation of the same
+function!
+
 llvm-isel-fuzzer
 ----------------
 

diff --git a/tools/llvm-demangle-fuzzer/CMakeLists.txt b/tools/llvm-demangle-fuzzer/CMakeLists.txt
new file mode 100644 (file)
index 0000000..28132cf
--- /dev/null
+++ b/tools/llvm-demangle-fuzzer/CMakeLists.txt
@@ -0,0 +1,8 @@
+set(LLVM_LINK_COMPONENTS
+  Demangle
+  FuzzMutate
+)
+
+add_llvm_fuzzer(llvm-demangle-fuzzer
+  llvm-demangle-fuzzer.cpp
+  DUMMY_MAIN DummyDemanglerFuzzer.cpp)

diff --git a/tools/llvm-demangle-fuzzer/DummyDemanglerFuzzer.cpp b/tools/llvm-demangle-fuzzer/DummyDemanglerFuzzer.cpp
new file mode 100644 (file)
index 0000000..a2bf9f1
--- /dev/null
+++ b/tools/llvm-demangle-fuzzer/DummyDemanglerFuzzer.cpp
@@ -0,0 +1,19 @@
+//===--- DummyDemanglerMain.cpp - Entry point to sanity check the fuzzer --===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementation of main so we can build and test without linking libFuzzer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/FuzzMutate/FuzzerCLI.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
+int main(int argc, char *argv[]) {
+  return llvm::runFuzzerOnInputs(argc, argv, LLVMFuzzerTestOneInput);
+}

diff --git a/tools/llvm-demangle-fuzzer/llvm-demangle-fuzzer.cpp b/tools/llvm-demangle-fuzzer/llvm-demangle-fuzzer.cpp
new file mode 100644 (file)
index 0000000..07c290a
--- /dev/null
+++ b/tools/llvm-demangle-fuzzer/llvm-demangle-fuzzer.cpp
@@ -0,0 +1,24 @@
+//===--- llvm-demangle-fuzzer.cpp - Fuzzer for the Itanium Demangler ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Demangle/Demangle.h"
+
+#include <cstdint>
+#include <cstdlib>
+#include <string>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  std::string NullTerminatedString((const char *)Data, Size);
+  int status = 0;
+  if (char *demangle = llvm::itaniumDemangle(NullTerminatedString.c_str(), nullptr,
+                                         nullptr, &status))
+    free(demangle);
+
+  return 0;
+}