v8/test/fuzzer/wasm-code.cc

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// 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/ostreams.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
using namespace v8::internal::wasm;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
// Save the flag so that we can change it and restore it later.
bool generate_test = v8::internal::FLAG_wasm_code_fuzzer_gen_test;
if (generate_test) {
v8::internal::OFStream os(stdout);
os << "// Copyright 2016 the V8 project authors. All rights reserved."
<< std::endl;
os << "// Use of this source code is governed by a BSD-style license that "
"can be"
<< std::endl;
os << "// found in the LICENSE file." << std::endl;
os << std::endl;
os << "// Flags: --expose-wasm" << std::endl;
os << std::endl;
os << "load(\"test/mjsunit/wasm/wasm-constants.js\");" << std::endl;
os << "load(\"test/mjsunit/wasm/wasm-module-builder.js\");" << std::endl;
os << std::endl;
os << "(function() {" << std::endl;
os << " var builder = new WasmModuleBuilder();" << std::endl;
os << " builder.addFunction(\"test\", kSig_i_iii)" << std::endl;
os << " .addBody([" << std::endl;
}
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);
TestSignatures sigs;
WasmModuleBuilder builder(&zone);
v8::internal::wasm::WasmFunctionBuilder* f =
builder.AddFunction(sigs.i_iii());
f->EmitCode(data, static_cast<uint32_t>(size));
uint8_t end_opcode = kExprEnd;
f->EmitCode(&end_opcode, 1);
f->ExportAs(v8::internal::CStrVector("main"));
ZoneBuffer buffer(&zone);
builder.WriteTo(buffer);
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));
// Clear the flag so that the WebAssembly code is not printed twice.
v8::internal::FLAG_wasm_code_fuzzer_gen_test = false;
if (module == nullptr) {
if (generate_test) {
v8::internal::OFStream os(stdout);
os << " ])" << std::endl;
os << " .exportFunc();" << std::endl;
os << " assertThrows(function() { builder.instantiate(); });"
<< std::endl;
os << "})();" << std::endl;
}
return 0;
}
if (generate_test) {
v8::internal::OFStream os(stdout);
os << " ])" << std::endl;
os << " .exportFunc();" << std::endl;
os << " var module = builder.instantiate();" << std::endl;
os << " module.exports.test(1, 2, 3);" << std::endl;
os << "})();" << std::endl;
}
ModuleWireBytes wire_bytes(buffer.begin(), buffer.end());
int32_t result_interpreted;
bool possible_nondeterminism = false;
{
WasmVal args[] = {WasmVal(1), WasmVal(2), WasmVal(3)};
result_interpreted = testing::InterpretWasmModule(
i_isolate, &interpreter_thrower, module.get(), wire_bytes, 0, args,
&possible_nondeterminism);
}
ErrorThrower compiler_thrower(i_isolate, "Compiler");
v8::internal::Handle<v8::internal::JSObject> instance =
testing::InstantiateModuleForTesting(i_isolate, &compiler_thrower,
module.get(), wire_bytes);
// Restore the flag.
v8::internal::FLAG_wasm_code_fuzzer_gen_test = generate_test;
if (!interpreter_thrower.error()) {
CHECK(!instance.is_null());
} else {
return 0;
}
int32_t result_compiled;
{
v8::internal::Handle<v8::internal::Object> arguments[] = {
v8::internal::handle(v8::internal::Smi::FromInt(1), i_isolate),
v8::internal::handle(v8::internal::Smi::FromInt(2), i_isolate),
v8::internal::handle(v8::internal::Smi::FromInt(3), i_isolate)};
result_compiled = testing::CallWasmFunctionForTesting(
i_isolate, instance, &compiler_thrower, "main", arraysize(arguments),
arguments, 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;
}