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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 "test/fuzzer/wasm-fuzzer-common.h"
#include "include/v8.h"
#include "src/isolate.h"
#include "src/objects-inl.h"
#include "src/wasm/module-compiler.h"
#include "src/wasm/wasm-api.h"
#include "src/wasm/wasm-module-builder.h"
#include "src/wasm/wasm-module.h"
#include "src/zone/accounting-allocator.h"
#include "src/zone/zone.h"
#include "test/common/wasm/wasm-module-runner.h"
#include "test/fuzzer/fuzzer-support.h"
namespace v8 {
namespace internal {
namespace wasm {
namespace fuzzer {
static constexpr uint32_t kWasmCodeFuzzerHashSeed = 83;
static constexpr const char* kNameString = "name";
static constexpr size_t kNameStringLength = 4;
int FuzzWasmSection(SectionCode section, const uint8_t* data, size_t size) {
v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
v8::Isolate* isolate = support->GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<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);
AccountingAllocator allocator;
Zone zone(&allocator, ZONE_NAME);
ZoneBuffer buffer(&zone);
buffer.write_u32(kWasmMagic);
buffer.write_u32(kWasmVersion);
if (section == kNameSectionCode) {
buffer.write_u8(kUnknownSectionCode);
buffer.write_size(size + kNameStringLength + 1);
buffer.write_u8(kNameStringLength);
buffer.write(reinterpret_cast<const uint8_t*>(kNameString),
kNameStringLength);
buffer.write(data, size);
} else {
buffer.write_u8(section);
buffer.write_size(size);
buffer.write(data, size);
}
ErrorThrower thrower(i_isolate, "decoder");
std::unique_ptr<const WasmModule> module(testing::DecodeWasmModuleForTesting(
i_isolate, &thrower, buffer.begin(), buffer.end(), kWasmOrigin));
return 0;
}
void InterpretAndExecuteModule(i::Isolate* isolate,
Handle<WasmModuleObject> module_object) {
ScheduledErrorThrower thrower(isolate, "WebAssembly Instantiation");
// Try to instantiate and interpret the module_object.
MaybeHandle<WasmInstanceObject> maybe_instance =
SyncInstantiate(isolate, &thrower, module_object,
Handle<JSReceiver>::null(), // imports
MaybeHandle<JSArrayBuffer>()); // memory
Handle<WasmInstanceObject> instance;
if (!maybe_instance.ToHandle(&instance)) return;
if (!testing::InterpretWasmModuleForTesting(isolate, instance, "main", 0,
nullptr)) {
return;
}
// Instantiate and execute the module_object.
maybe_instance = SyncInstantiate(isolate, &thrower, module_object,
Handle<JSReceiver>::null(), // imports
MaybeHandle<JSArrayBuffer>()); // memory
if (!maybe_instance.ToHandle(&instance)) return;
testing::RunWasmModuleForTesting(isolate, instance, 0, nullptr);
}
int WasmExecutionFuzzer::FuzzWasmModule(
const uint8_t* data, size_t size) {
// Save the flag so that we can change it and restore it later.
bool generate_test = FLAG_wasm_code_fuzzer_gen_test;
if (generate_test) {
OFStream os(stdout);
os << "// Copyright 2017 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 << "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.addMemory(16, 32, false);" << std::endl;
os << " builder.addFunction(\"test\", kSig_i_iii)" << std::endl;
os << " .addBodyWithEnd([" << std::endl;
}
v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
v8::Isolate* isolate = support->GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<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);
HandleScope scope(i_isolate);
AccountingAllocator allocator;
Zone zone(&allocator, ZONE_NAME);
ZoneBuffer buffer(&zone);
int32_t num_args = 0;
std::unique_ptr<WasmValue[]> interpreter_args;
std::unique_ptr<Handle<Object>[]> compiler_args;
if (!GenerateModule(i_isolate, &zone, data, size, buffer, num_args,
interpreter_args, compiler_args)) {
return 0;
}
testing::SetupIsolateForWasmModule(i_isolate);
ErrorThrower interpreter_thrower(i_isolate, "Interpreter");
ModuleWireBytes wire_bytes(buffer.begin(), buffer.end());
MaybeHandle<WasmModuleObject> compiled_module =
SyncCompile(i_isolate, &interpreter_thrower, wire_bytes);
// Clear the flag so that the WebAssembly code is not printed twice.
FLAG_wasm_code_fuzzer_gen_test = false;
bool compiles = !compiled_module.is_null();
if (generate_test) {
OFStream os(stdout);
os << " ])" << std::endl
<< " .exportFunc();" << std::endl;
if (compiles) {
os << " var module = builder.instantiate();" << std::endl
<< " module.exports.test(1, 2, 3);" << std::endl;
} else {
OFStream os(stdout);
os << " assertThrows(function() { builder.instantiate(); });"
<< std::endl;
}
os << "})();" << std::endl;
}
bool validates = SyncValidate(i_isolate, wire_bytes);
if (compiles != validates) {
uint32_t hash = StringHasher::HashSequentialString(
data, static_cast<int>(size), kWasmCodeFuzzerHashSeed);
V8_Fatal(__FILE__, __LINE__,
"compiles != validates (%d vs %d); WasmCodeFuzzerHash=%x",
compiles, validates, hash);
}
if (!compiles) return 0;
int32_t result_interpreted;
bool possible_nondeterminism = false;
{
MaybeHandle<WasmInstanceObject> interpreter_instance = SyncInstantiate(
i_isolate, &interpreter_thrower, compiled_module.ToHandleChecked(),
MaybeHandle<JSReceiver>(), MaybeHandle<JSArrayBuffer>());
if (interpreter_thrower.error()) {
return 0;
}
result_interpreted = testing::InterpretWasmModule(
i_isolate, interpreter_instance.ToHandleChecked(), &interpreter_thrower,
0, interpreter_args.get(), &possible_nondeterminism);
}
// Do not execute the generated code if the interpreter did not finished after
// a bounded number of steps.
if (interpreter_thrower.error()) {
return 0;
}
int32_t result_compiled;
{
ErrorThrower compiler_thrower(i_isolate, "Compiler");
MaybeHandle<WasmInstanceObject> compiled_instance = SyncInstantiate(
i_isolate, &compiler_thrower, compiled_module.ToHandleChecked(),
MaybeHandle<JSReceiver>(), MaybeHandle<JSArrayBuffer>());
DCHECK(!compiler_thrower.error());
result_compiled = testing::CallWasmFunctionForTesting(
i_isolate, compiled_instance.ToHandleChecked(), &compiler_thrower,
"main", num_args, compiler_args.get());
}
// 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) return 0;
if (result_interpreted == bit_cast<int32_t>(0xdeadbeef)) {
CHECK(i_isolate->has_pending_exception());
i_isolate->clear_pending_exception();
} else {
CHECK(!i_isolate->has_pending_exception());
if (result_interpreted != result_compiled) {
V8_Fatal(__FILE__, __LINE__, "WasmCodeFuzzerHash=%x",
StringHasher::HashSequentialString(data, static_cast<int>(size),
kWasmCodeFuzzerHashSeed));
}
}
return 0;
}
} // namespace fuzzer
} // namespace wasm
} // namespace internal
} // namespace v8
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