[PATCH] D119000: [Bitcode] Add fuzzer for bitcode reading

[Nikita Popov via Phabricator via llvm-commits]

nikic created this revision.
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Inspired by the discussion on D118694 <https://reviews.llvm.org/D118694>, this adds a straightforward fuzzer for bitcode reading.


https://reviews.llvm.org/D119000

Files:
  llvm/tools/llvm-dis-fuzzer/CMakeLists.txt
  llvm/tools/llvm-dis-fuzzer/llvm-dis-fuzzer.cpp


Index: llvm/tools/llvm-dis-fuzzer/llvm-dis-fuzzer.cpp
===================================================================
--- /dev/null
+++ llvm/tools/llvm-dis-fuzzer/llvm-dis-fuzzer.cpp
@@ -0,0 +1,25 @@
+//===-- llvm-dis-fuzzer.cpp - Fuzzer for llvm-dis using lib/Fuzzer --------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Fuzzer for LLVM bitcode reading.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Bitcode/BitcodeReader.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+using namespace llvm;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  LLVMContext Context;
+  auto Buffer = MemoryBuffer::getMemBuffer(
+      StringRef(reinterpret_cast<const char *>(Data), Size), "Fuzzer input",
+      /*RequiresNullTerminator=*/false);
+  consumeError(parseBitcodeFile(Buffer->getMemBufferRef(), Context).takeError());
+  return 0;
+}
Index: llvm/tools/llvm-dis-fuzzer/CMakeLists.txt
===================================================================
--- /dev/null
+++ llvm/tools/llvm-dis-fuzzer/CMakeLists.txt
@@ -0,0 +1,6 @@
+set(LLVM_LINK_COMPONENTS
+  BitReader
+)
+add_llvm_fuzzer(llvm-dis-fuzzer
+  llvm-dis-fuzzer.cpp
+  )


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