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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 <limits.h>
#include <stddef.h>
#include <stdint.h>
#include "include/libplatform/libplatform.h"
#include "include/v8-context.h"
#include "include/v8-exception.h"
#include "include/v8-isolate.h"
#include "include/v8-local-handle.h"
#include "src/execution/isolate-inl.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-feature-flags.h"
#include "src/wasm/wasm-module.h"
#include "test/common/wasm/wasm-module-runner.h"
#include "test/fuzzer/fuzzer-support.h"
#include "test/fuzzer/wasm-fuzzer-common.h"
namespace v8::internal::wasm::fuzzer {
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
v8::Isolate* isolate = support->GetIsolate();
// We reduce the maximum memory size and table size of WebAssembly instances
// to avoid OOMs in the fuzzer.
v8_flags.wasm_max_mem_pages = 32;
v8_flags.wasm_max_table_size = 100;
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());
// We explicitly enable staged/experimental WebAssembly features here to
// increase fuzzer coverage. For libfuzzer fuzzers it is not possible that the
// fuzzer enables the flag by itself.
EnableExperimentalWasmFeatures(isolate);
v8::TryCatch try_catch(isolate);
testing::SetupIsolateForWasmModule(i_isolate);
ModuleWireBytes wire_bytes(data, data + size);
HandleScope scope(i_isolate);
ErrorThrower thrower(i_isolate, "wasm fuzzer");
Handle<WasmModuleObject> module_object;
auto enabled_features = WasmFeatures::FromIsolate(i_isolate);
bool compiles =
GetWasmEngine()
->SyncCompile(i_isolate, enabled_features, &thrower, wire_bytes)
.ToHandle(&module_object);
if (v8_flags.wasm_fuzzer_gen_test) {
GenerateTestCase(i_isolate, wire_bytes, compiles);
}
if (compiles) {
ExecuteAgainstReference(i_isolate, module_object,
kDefaultMaxFuzzerExecutedInstructions);
}
// Pump the message loop and run micro tasks, e.g. GC finalization tasks.
support->PumpMessageLoop(v8::platform::MessageLoopBehavior::kDoNotWait);
isolate->PerformMicrotaskCheckpoint();
return 0;
}
} // namespace v8::internal::wasm::fuzzer
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