| // Copyright 2016 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include "include/v8.h" |
| #include "src/isolate.h" |
| #include "src/objects.h" |
| #include "src/utils.h" |
| #include "src/wasm/wasm-interpreter.h" |
| #include "src/wasm/wasm-module-builder.h" |
| #include "src/wasm/wasm-module.h" |
| #include "test/common/wasm/test-signatures.h" |
| #include "test/common/wasm/wasm-module-runner.h" |
| #include "test/fuzzer/fuzzer-support.h" |
| |
| #define WASM_CODE_FUZZER_HASH_SEED 83 |
| #define MAX_NUM_FUNCTIONS 3 |
| #define MAX_NUM_PARAMS 3 |
| |
| using namespace v8::internal::wasm; |
| |
| template <typename V> |
| static inline V read_value(const uint8_t** data, size_t* size, bool* ok) { |
| // The status flag {ok} checks that the decoding up until now was okay, and |
| // that a value of type V can be read without problems. |
| *ok &= (*size > sizeof(V)); |
| if (!(*ok)) return 0; |
| V result = v8::internal::ReadLittleEndianValue<V>(*data); |
| *data += sizeof(V); |
| *size -= sizeof(V); |
| return result; |
| } |
| |
| static void add_argument( |
| v8::internal::Isolate* isolate, LocalType type, WasmVal* interpreter_args, |
| v8::internal::Handle<v8::internal::Object>* compiled_args, int* argc, |
| const uint8_t** data, size_t* size, bool* ok) { |
| if (!(*ok)) return; |
| switch (type) { |
| case kAstF32: { |
| float value = read_value<float>(data, size, ok); |
| interpreter_args[*argc] = WasmVal(value); |
| compiled_args[*argc] = |
| isolate->factory()->NewNumber(static_cast<double>(value)); |
| break; |
| } |
| case kAstF64: { |
| double value = read_value<double>(data, size, ok); |
| interpreter_args[*argc] = WasmVal(value); |
| compiled_args[*argc] = isolate->factory()->NewNumber(value); |
| break; |
| } |
| case kAstI32: { |
| int32_t value = read_value<int32_t>(data, size, ok); |
| interpreter_args[*argc] = WasmVal(value); |
| compiled_args[*argc] = |
| isolate->factory()->NewNumber(static_cast<double>(value)); |
| break; |
| } |
| default: |
| UNREACHABLE(); |
| } |
| (*argc)++; |
| } |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { |
| v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get(); |
| v8::Isolate* isolate = support->GetIsolate(); |
| v8::internal::Isolate* i_isolate = |
| reinterpret_cast<v8::internal::Isolate*>(isolate); |
| |
| // Clear any pending exceptions from a prior run. |
| if (i_isolate->has_pending_exception()) { |
| i_isolate->clear_pending_exception(); |
| } |
| |
| v8::Isolate::Scope isolate_scope(isolate); |
| v8::HandleScope handle_scope(isolate); |
| v8::Context::Scope context_scope(support->GetContext()); |
| v8::TryCatch try_catch(isolate); |
| |
| v8::internal::AccountingAllocator allocator; |
| v8::internal::Zone zone(&allocator, ZONE_NAME); |
| |
| bool ok = true; |
| uint8_t num_functions = |
| (read_value<uint8_t>(&data, &size, &ok) % MAX_NUM_FUNCTIONS) + 1; |
| |
| LocalType types[] = {kAstF32, kAstF64, kAstI32, kAstI64}; |
| WasmVal interpreter_args[3]; |
| v8::internal::Handle<v8::internal::Object> compiled_args[3]; |
| int argc = 0; |
| |
| WasmModuleBuilder builder(&zone); |
| for (int fun = 0; fun < num_functions; fun++) { |
| size_t num_params = static_cast<size_t>( |
| (read_value<uint8_t>(&data, &size, &ok) % MAX_NUM_PARAMS) + 1); |
| FunctionSig::Builder sig_builder(&zone, 1, num_params); |
| sig_builder.AddReturn(kAstI32); |
| for (size_t param = 0; param < num_params; param++) { |
| // The main function cannot handle int64 parameters. |
| LocalType param_type = types[(read_value<uint8_t>(&data, &size, &ok) % |
| (arraysize(types) - (fun == 0 ? 1 : 0)))]; |
| sig_builder.AddParam(param_type); |
| if (fun == 0) { |
| add_argument(i_isolate, param_type, interpreter_args, compiled_args, |
| &argc, &data, &size, &ok); |
| } |
| } |
| v8::internal::wasm::WasmFunctionBuilder* f = |
| builder.AddFunction(sig_builder.Build()); |
| uint32_t code_size = static_cast<uint32_t>(size / num_functions); |
| f->EmitCode(data, code_size); |
| data += code_size; |
| size -= code_size; |
| if (fun == 0) { |
| f->ExportAs(v8::internal::CStrVector("main")); |
| } |
| } |
| |
| ZoneBuffer buffer(&zone); |
| builder.WriteTo(buffer); |
| |
| if (!ok) { |
| // The input data was too short. |
| return 0; |
| } |
| |
| v8::internal::wasm::testing::SetupIsolateForWasmModule(i_isolate); |
| |
| v8::internal::HandleScope scope(i_isolate); |
| |
| ErrorThrower interpreter_thrower(i_isolate, "Interpreter"); |
| std::unique_ptr<const WasmModule> module(testing::DecodeWasmModuleForTesting( |
| i_isolate, &interpreter_thrower, buffer.begin(), buffer.end(), |
| v8::internal::wasm::ModuleOrigin::kWasmOrigin, true)); |
| |
| if (module == nullptr) { |
| return 0; |
| } |
| int32_t result_interpreted; |
| bool possible_nondeterminism = false; |
| { |
| result_interpreted = testing::InterpretWasmModule( |
| i_isolate, &interpreter_thrower, module.get(), 0, interpreter_args, |
| &possible_nondeterminism); |
| } |
| |
| ErrorThrower compiler_thrower(i_isolate, "Compiler"); |
| v8::internal::Handle<v8::internal::JSObject> instance = |
| testing::InstantiateModuleForTesting(i_isolate, &compiler_thrower, |
| module.get()); |
| |
| if (!interpreter_thrower.error()) { |
| CHECK(!instance.is_null()); |
| } else { |
| return 0; |
| } |
| int32_t result_compiled; |
| { |
| result_compiled = testing::CallWasmFunctionForTesting( |
| i_isolate, instance, &compiler_thrower, "main", argc, compiled_args, |
| v8::internal::wasm::ModuleOrigin::kWasmOrigin); |
| } |
| if (result_interpreted == bit_cast<int32_t>(0xdeadbeef)) { |
| CHECK(i_isolate->has_pending_exception()); |
| i_isolate->clear_pending_exception(); |
| } else { |
| // The WebAssembly spec allows the sign bit of NaN to be non-deterministic. |
| // This sign bit may cause result_interpreted to be different than |
| // result_compiled. Therefore we do not check the equality of the results |
| // if the execution may have produced a NaN at some point. |
| if (!possible_nondeterminism && (result_interpreted != result_compiled)) { |
| V8_Fatal(__FILE__, __LINE__, "WasmCodeFuzzerHash=%x", |
| v8::internal::StringHasher::HashSequentialString( |
| data, static_cast<int>(size), WASM_CODE_FUZZER_HASH_SEED)); |
| } |
| } |
| return 0; |
| } |