FuzzStructuredClone.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "FuzzingInterface.h"

#include "jsapi.h"

#include "js/StructuredClone.h"

#include "mozilla/dom/ipc/StructuredCloneData.h"

#include "mozilla/dom/ScriptSettings.h"

#include "mozilla/dom/StructuredCloneHolder.h"

#include "mozilla/dom/SimpleGlobalObject.h"

#include "mozilla/ErrorResult.h"

#include "mozilla/ScopeExit.h"

#include "mozilla/UniquePtr.h"

#include "nsCycleCollector.h"

using namespace mozilla;

using namespace mozilla::dom;

using namespace mozilla::dom::ipc;

MOZ_RUNINIT JS::PersistentRooted<JSObject*> global;

static int FuzzingInitDomSC(int* argc, char*** argv) {

  JSObject* simpleGlobal =

      SimpleGlobalObject::Create(SimpleGlobalObject::GlobalType::BindingDetail);

  global.init(mozilla::dom::RootingCx());

  global.set(simpleGlobal);

  return 0;

static int FuzzingRunDomSC(const uint8_t* data, size_t size) {

  if (size < 8) {

    return 0;

  AutoJSAPI jsapi;

  MOZ_RELEASE_ASSERT(jsapi.Init(global));

  JSContext* cx = jsapi.cx();

  auto gcGuard = mozilla::MakeScopeExit([&] {

    JS::PrepareForFullGC(cx);

    JS::NonIncrementalGC(cx, JS::GCOptions::Normal, JS::GCReason::API);

    nsCycleCollector_collect(CCReason::API, nullptr);

});

  // The internals of SCInput have a release assert about the padding

  // of the data, so we fix it here to avoid performance problems

  // during fuzzing.

  size -= size % 8;

  StructuredCloneData scdata;

  if (!scdata.CopyExternalData(reinterpret_cast<const char*>(data), size)) {

    return 0;

  JS::Rooted<JS::Value> result(cx);

  ErrorResult rv;

  scdata.Read(cx, &result, rv);

  rv.SuppressException();

  return 0;

MOZ_FUZZING_INTERFACE_RAW(FuzzingInitDomSC, FuzzingRunDomSC,

                          StructuredCloneReaderDOM);