| //===--- swift-reflection-fuzzer.cpp - Swift reflection fuzzer ------------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See https://swift.org/LICENSE.txt for license information |
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This program tries to fuzz the metadata reader shipped as part of the swift |
| // runtime and used by the debugger. |
| // For this to work you need to pass --enable-sanitizer-coverage to build-script |
| // otherwise the fuzzer doesn't have coverage information to make progress |
| // (making the whole fuzzing operation really ineffective). |
| // It is recommended to use the tool together with another sanitizer to expose |
| // more bugs (asan, lsan, etc...) |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "swift/Reflection/ReflectionContext.h" |
| #include "swift/Reflection/TypeRef.h" |
| #include "swift/Reflection/TypeRefBuilder.h" |
| #include "llvm/Object/Archive.h" |
| #include "llvm/Object/ELF.h" |
| #include "llvm/Object/ELFObjectFile.h" |
| #include "llvm/Object/MachOUniversal.h" |
| #include "llvm/Support/CommandLine.h" |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| using namespace llvm::object; |
| |
| using namespace swift; |
| using namespace swift::reflection; |
| using namespace swift::remote; |
| |
| using NativeReflectionContext = swift::reflection::ReflectionContext< |
| External<RuntimeTarget<sizeof(uintptr_t)>>>; |
| |
| template <typename T> static T unwrap(llvm::Expected<T> value) { |
| if (value) |
| return std::move(value.get()); |
| return T(); |
| } |
| |
| class ObjectMemoryReader : public MemoryReader { |
| public: |
| ObjectMemoryReader() {} |
| |
| bool queryDataLayout(DataLayoutQueryType type, void *inBuffer, |
| void *outBuffer) override { |
| switch (type) { |
| case DLQ_GetPointerSize: { |
| auto result = static_cast<uint8_t *>(outBuffer); |
| *result = sizeof(void *); |
| return true; |
| } |
| case DLQ_GetSizeSize: { |
| auto result = static_cast<uint8_t *>(outBuffer); |
| *result = sizeof(size_t); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| RemoteAddress getSymbolAddress(const std::string &name) override { |
| return RemoteAddress(nullptr); |
| } |
| |
| bool isAddressValid(RemoteAddress addr, uint64_t size) const { return true; } |
| |
| ReadBytesResult readBytes(RemoteAddress address, uint64_t size) override { |
| return ReadBytesResult((const void *)address.getAddressData(), |
| [](const void *) {}); |
| } |
| |
| bool readString(RemoteAddress address, std::string &dest) override { |
| if (!isAddressValid(address, 1)) |
| return false; |
| auto cString = StringRef((const char *)address.getAddressData()); |
| dest.append(cString.begin(), cString.end()); |
| return true; |
| } |
| }; |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { |
| auto reader = std::make_shared<ObjectMemoryReader>(); |
| NativeReflectionContext context(std::move(reader)); |
| context.addImage(RemoteAddress(Data)); |
| context.getBuilder().dumpAllSections(std::cout); |
| return 0; // Non-zero return values are reserved for future use. |
| } |