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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 */
#include "mozilla/ScopeExit.h"
#include "jsapi.h"
#include "fuzz-tests/tests.h"
#include "js/StructuredClone.h"
#include "vm/Interpreter.h"
#include "vm/JSContext-inl.h"
using namespace js;
// These are defined and pre-initialized by the harness (in tests.cpp).
extern JS::PersistentRootedObject gGlobal;
extern JSContext* gCx;
static int testStructuredCloneReaderInit(int* argc, char*** argv) { return 0; }
static int testStructuredCloneReaderFuzz(const uint8_t* buf, size_t size) {
auto gcGuard = mozilla::MakeScopeExit([&] {
JS::NonIncrementalGC(gCx, JS::GCOptions::Normal, JS::GCReason::API);
if (!size) return 0;
// Make sure to pad the buffer to a multiple of kSegmentAlignment
const size_t kSegmentAlignment = 8;
size_t buf_size = RoundUp(size, kSegmentAlignment);
JS::StructuredCloneScope scope = JS::StructuredCloneScope::DifferentProcess;
auto clonebuf = MakeUnique<JSStructuredCloneData>(scope);
if (!clonebuf || !clonebuf->Init(buf_size)) {
return 0;
// Copy buffer then pad with zeroes.
if (!clonebuf->AppendBytes((const char*)buf, size)) {
return 0;
char padding[kSegmentAlignment] = {0};
if (!clonebuf->AppendBytes(padding, buf_size - size)) {
return 0;
JS::CloneDataPolicy policy;
RootedValue deserialized(gCx);
if (!JS_ReadStructuredClone(gCx, *clonebuf, JS_STRUCTURED_CLONE_VERSION,
scope, &deserialized, policy, nullptr, nullptr)) {
return 0;
/* If we succeeded in deserializing, we should try to reserialize the data.
This has two main advantages:
1) It tests parts of the serializer as well.
2) The deserialized data is actually used, making it more likely to detect
further memory-related problems.
Tests show that this also doesn't cause a serious performance penalty.
mozilla::Maybe<JSAutoStructuredCloneBuffer> clonebufOut;
clonebufOut.emplace(scope, nullptr, nullptr);
if (!clonebufOut->write(gCx, deserialized, UndefinedHandleValue, policy)) {
return 0;
return 0;
testStructuredCloneReaderFuzz, StructuredCloneReader);