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-rw-r--r--dom/base/StructuredCloneBlob.cpp255
1 files changed, 255 insertions, 0 deletions
diff --git a/dom/base/StructuredCloneBlob.cpp b/dom/base/StructuredCloneBlob.cpp
new file mode 100644
index 0000000000..9c0f764323
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+++ b/dom/base/StructuredCloneBlob.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 "mozilla/dom/StructuredCloneBlob.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <new>
+#include <utility>
+#include "js/StructuredClone.h"
+#include "js/Value.h"
+#include "js/Wrapper.h"
+#include "jsapi.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/BlobImpl.h"
+#include "mozilla/dom/StructuredCloneHolderBinding.h"
+#include "mozilla/dom/StructuredCloneTags.h"
+#include "nsPrintfCString.h"
+#include "xpcpublic.h"
+
+namespace mozilla::dom {
+
+StructuredCloneBlob::StructuredCloneBlob() {
+ mHolder.emplace(Holder::CloningSupported, Holder::TransferringNotSupported,
+ Holder::StructuredCloneScope::DifferentProcess);
+}
+
+StructuredCloneBlob::~StructuredCloneBlob() {
+ UnregisterWeakMemoryReporter(this);
+}
+
+/* static */
+already_AddRefed<StructuredCloneBlob> StructuredCloneBlob::Constructor(
+ GlobalObject& aGlobal, const nsACString& aName,
+ const nsACString& aAnonymizedName, JS::Handle<JS::Value> aValue,
+ JS::Handle<JSObject*> aTargetGlobal, ErrorResult& aRv) {
+ JSContext* cx = aGlobal.Context();
+
+ RefPtr<StructuredCloneBlob> holder = StructuredCloneBlob::Create();
+
+ holder->mName = aName;
+ holder->mAnonymizedName = aAnonymizedName.IsVoid() ? aName : aAnonymizedName;
+
+ Maybe<JSAutoRealm> ar;
+ JS::Rooted<JS::Value> value(cx, aValue);
+
+ if (aTargetGlobal) {
+ // OK to unwrap if our caller (represented by cx's Realm) can do it.
+ JS::Rooted<JSObject*> targetGlobal(
+ cx, js::CheckedUnwrapDynamic(aTargetGlobal, cx));
+ if (!targetGlobal) {
+ js::ReportAccessDenied(cx);
+ aRv.NoteJSContextException(cx);
+ return nullptr;
+ }
+
+ ar.emplace(cx, targetGlobal);
+
+ if (!JS_WrapValue(cx, &value)) {
+ aRv.NoteJSContextException(cx);
+ return nullptr;
+ }
+ } else if (value.isObject()) {
+ // OK to unwrap if our caller (represented by cx's Realm) can do it.
+ JS::Rooted<JSObject*> obj(cx,
+ js::CheckedUnwrapDynamic(&value.toObject(), cx));
+ if (!obj) {
+ js::ReportAccessDenied(cx);
+ aRv.NoteJSContextException(cx);
+ return nullptr;
+ }
+
+ ar.emplace(cx, obj);
+ value = JS::ObjectValue(*obj);
+ }
+
+ holder->mHolder->Write(cx, value, aRv);
+ if (aRv.Failed()) {
+ return nullptr;
+ }
+
+ return holder.forget();
+}
+
+void StructuredCloneBlob::Deserialize(JSContext* aCx,
+ JS::Handle<JSObject*> aTargetScope,
+ bool aKeepData,
+ JS::MutableHandle<JS::Value> aResult,
+ ErrorResult& aRv) {
+ // OK to unwrap if our caller (represented by aCx's Realm) can do it.
+ JS::Rooted<JSObject*> scope(aCx, js::CheckedUnwrapDynamic(aTargetScope, aCx));
+ if (!scope) {
+ js::ReportAccessDenied(aCx);
+ aRv.NoteJSContextException(aCx);
+ return;
+ }
+
+ if (!mHolder.isSome()) {
+ aRv.Throw(NS_ERROR_NOT_INITIALIZED);
+ return;
+ }
+
+ {
+ JSAutoRealm ar(aCx, scope);
+
+ mHolder->Read(xpc::NativeGlobal(scope), aCx, aResult, aRv);
+ if (aRv.Failed()) {
+ return;
+ }
+ }
+
+ if (!aKeepData) {
+ mHolder.reset();
+ }
+
+ if (!JS_WrapValue(aCx, aResult)) {
+ aResult.set(JS::UndefinedValue());
+ aRv.NoteJSContextException(aCx);
+ }
+}
+
+/* static */
+JSObject* StructuredCloneBlob::ReadStructuredClone(
+ JSContext* aCx, JSStructuredCloneReader* aReader,
+ StructuredCloneHolder* aHolder) {
+ JS::Rooted<JSObject*> obj(aCx);
+ {
+ RefPtr<StructuredCloneBlob> holder = StructuredCloneBlob::Create();
+
+ if (!StructuredCloneHolder::ReadCString(aReader, holder->mName)) {
+ return nullptr;
+ }
+
+ if (!StructuredCloneHolder::ReadCString(aReader, holder->mAnonymizedName)) {
+ return nullptr;
+ }
+
+ if (!holder->mHolder->ReadStructuredCloneInternal(aCx, aReader, aHolder) ||
+ !holder->WrapObject(aCx, nullptr, &obj)) {
+ return nullptr;
+ }
+ }
+ return obj.get();
+}
+
+bool StructuredCloneBlob::Holder::ReadStructuredCloneInternal(
+ JSContext* aCx, JSStructuredCloneReader* aReader,
+ StructuredCloneHolder* aHolder) {
+ uint32_t length;
+ uint32_t version;
+ if (!JS_ReadUint32Pair(aReader, &length, &version)) {
+ return false;
+ }
+ if (length % 8 != 0) {
+ return false;
+ }
+
+ uint32_t blobOffset;
+ uint32_t blobCount;
+ if (!JS_ReadUint32Pair(aReader, &blobOffset, &blobCount)) {
+ return false;
+ }
+ if (blobCount) {
+#ifdef FUZZING
+ if (blobOffset >= aHolder->BlobImpls().Length()) {
+ return false;
+ }
+#endif
+ BlobImpls().AppendElements(&aHolder->BlobImpls()[blobOffset], blobCount);
+ }
+
+ JSStructuredCloneData data(mStructuredCloneScope);
+ while (length) {
+ size_t size;
+ char* buffer = data.AllocateBytes(length, &size);
+ if (!buffer || !JS_ReadBytes(aReader, buffer, size)) {
+ return false;
+ }
+ length -= size;
+ }
+
+ mBuffer = MakeUnique<JSAutoStructuredCloneBuffer>(
+ mStructuredCloneScope, &StructuredCloneHolder::sCallbacks, this);
+ mBuffer->adopt(std::move(data), version, &StructuredCloneHolder::sCallbacks);
+
+ return true;
+}
+
+bool StructuredCloneBlob::WriteStructuredClone(JSContext* aCx,
+ JSStructuredCloneWriter* aWriter,
+ StructuredCloneHolder* aHolder) {
+ if (mHolder.isNothing()) {
+ return false;
+ }
+
+ if (!JS_WriteUint32Pair(aWriter, SCTAG_DOM_STRUCTURED_CLONE_HOLDER, 0) ||
+ !StructuredCloneHolder::WriteCString(aWriter, mName) ||
+ !StructuredCloneHolder::WriteCString(aWriter, mAnonymizedName)) {
+ return false;
+ }
+
+ return mHolder->WriteStructuredClone(aCx, aWriter, aHolder);
+}
+
+bool StructuredCloneBlob::Holder::WriteStructuredClone(
+ JSContext* aCx, JSStructuredCloneWriter* aWriter,
+ StructuredCloneHolder* aHolder) {
+ auto& data = mBuffer->data();
+ if (!JS_WriteUint32Pair(aWriter, data.Size(), JS_STRUCTURED_CLONE_VERSION) ||
+ !JS_WriteUint32Pair(aWriter, aHolder->BlobImpls().Length(),
+ BlobImpls().Length())) {
+ return false;
+ }
+
+ aHolder->BlobImpls().AppendElements(BlobImpls());
+
+ return data.ForEachDataChunk([&](const char* aData, size_t aSize) {
+ return JS_WriteBytes(aWriter, aData, aSize);
+ });
+}
+
+bool StructuredCloneBlob::WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto,
+ JS::MutableHandle<JSObject*> aResult) {
+ return StructuredCloneHolder_Binding::Wrap(aCx, this, aGivenProto, aResult);
+}
+
+NS_IMETHODIMP
+StructuredCloneBlob::CollectReports(nsIHandleReportCallback* aHandleReport,
+ nsISupports* aData, bool aAnonymize) {
+ size_t size = MallocSizeOf(this);
+ if (mHolder.isSome()) {
+ size += mHolder->SizeOfExcludingThis(MallocSizeOf);
+ }
+
+ aHandleReport->Callback(
+ ""_ns,
+ nsPrintfCString("explicit/dom/structured-clone-holder/%s",
+ aAnonymize ? mAnonymizedName.get() : mName.get()),
+ KIND_HEAP, UNITS_BYTES, size,
+ "Memory used by StructuredCloneHolder DOM objects."_ns, aData);
+
+ return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(StructuredCloneBlob, nsIMemoryReporter)
+
+} // namespace mozilla::dom