/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: set ts=4 sw=4 et 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 "WrapperAnswer.h" #include "JavaScriptLogging.h" #include "mozilla/dom/ContentChild.h" #include "mozilla/dom/BindingUtils.h" #include "mozilla/dom/ScriptSettings.h" #include "xpcprivate.h" #include "js/Class.h" #include "jsfriendapi.h" using namespace JS; using namespace mozilla; using namespace mozilla::jsipc; // Note - Using AutoJSAPI (rather than AutoEntryScript) for a trap means // that we don't expect it to run script. For most of these traps that will only // happen if the target is a scripted proxy, which is probably something that we // don't want to support over CPOWs. When enough code is fixed up, the long-term // plan is to have the JS engine throw if it encounters script when it isn't // expecting it. using mozilla::dom::AutoJSAPI; using mozilla::dom::AutoEntryScript; static void MaybeForceDebugGC() { static bool sEnvVarInitialized = false; static bool sDebugGCs = false; if (!sEnvVarInitialized) sDebugGCs = !!PR_GetEnv("MOZ_DEBUG_DEAD_CPOWS"); if (sDebugGCs) { JSContext* cx = nsXPConnect::GetContextInstance()->Context(); PrepareForFullGC(cx); GCForReason(cx, GC_NORMAL, gcreason::COMPONENT_UTILS); } } bool WrapperAnswer::fail(AutoJSAPI& jsapi, ReturnStatus* rs) { // By default, we set |undefined| unless we can get a more meaningful // exception. *rs = ReturnStatus(ReturnException(JSVariant(UndefinedVariant()))); // Note we always return true from this function, since this propagates // to the IPC code, and we don't want a JS failure to cause the death // of the child process. JSContext* cx = jsapi.cx(); RootedValue exn(cx); if (!jsapi.HasException()) return true; if (!jsapi.StealException(&exn)) return true; if (JS_IsStopIteration(exn)) { *rs = ReturnStatus(ReturnStopIteration()); return true; } // If this fails, we still don't want to exit. Just return an invalid // exception. (void) toVariant(cx, exn, &rs->get_ReturnException().exn()); return true; } bool WrapperAnswer::ok(ReturnStatus* rs) { *rs = ReturnStatus(ReturnSuccess()); return true; } bool WrapperAnswer::ok(ReturnStatus* rs, const JS::ObjectOpResult& result) { *rs = result ? ReturnStatus(ReturnSuccess()) : ReturnStatus(ReturnObjectOpResult(result.failureCode())); return true; } bool WrapperAnswer::deadCPOW(AutoJSAPI& jsapi, ReturnStatus* rs) { JSContext* cx = jsapi.cx(); JS_ClearPendingException(cx); *rs = ReturnStatus(ReturnDeadCPOW()); return true; } bool WrapperAnswer::RecvPreventExtensions(const ObjectId& objId, ReturnStatus* rs) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); ObjectOpResult success; if (!JS_PreventExtensions(cx, obj, success)) return fail(jsapi, rs); LOG("%s.preventExtensions()", ReceiverObj(objId)); return ok(rs, success); } static void EmptyDesc(PPropertyDescriptor* desc) { desc->obj() = LocalObject(0); desc->attrs() = 0; desc->value() = UndefinedVariant(); desc->getter() = 0; desc->setter() = 0; } bool WrapperAnswer::RecvGetPropertyDescriptor(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs, PPropertyDescriptor* out) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); EmptyDesc(out); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.getPropertyDescriptor(%s)", ReceiverObj(objId), Identifier(idVar)); RootedId id(cx); if (!fromJSIDVariant(cx, idVar, &id)) return fail(jsapi, rs); Rooted<PropertyDescriptor> desc(cx); if (!JS_GetPropertyDescriptorById(cx, obj, id, &desc)) return fail(jsapi, rs); if (!fromDescriptor(cx, desc, out)) return fail(jsapi, rs); return ok(rs); } bool WrapperAnswer::RecvGetOwnPropertyDescriptor(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs, PPropertyDescriptor* out) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); EmptyDesc(out); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.getOwnPropertyDescriptor(%s)", ReceiverObj(objId), Identifier(idVar)); RootedId id(cx); if (!fromJSIDVariant(cx, idVar, &id)) return fail(jsapi, rs); Rooted<PropertyDescriptor> desc(cx); if (!JS_GetOwnPropertyDescriptorById(cx, obj, id, &desc)) return fail(jsapi, rs); if (!fromDescriptor(cx, desc, out)) return fail(jsapi, rs); return ok(rs); } bool WrapperAnswer::RecvDefineProperty(const ObjectId& objId, const JSIDVariant& idVar, const PPropertyDescriptor& descriptor, ReturnStatus* rs) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("define %s[%s]", ReceiverObj(objId), Identifier(idVar)); RootedId id(cx); if (!fromJSIDVariant(cx, idVar, &id)) return fail(jsapi, rs); Rooted<PropertyDescriptor> desc(cx); if (!toDescriptor(cx, descriptor, &desc)) return fail(jsapi, rs); ObjectOpResult success; if (!JS_DefinePropertyById(cx, obj, id, desc, success)) return fail(jsapi, rs); return ok(rs, success); } bool WrapperAnswer::RecvDelete(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("delete %s[%s]", ReceiverObj(objId), Identifier(idVar)); RootedId id(cx); if (!fromJSIDVariant(cx, idVar, &id)) return fail(jsapi, rs); ObjectOpResult success; if (!JS_DeletePropertyById(cx, obj, id, success)) return fail(jsapi, rs); return ok(rs, success); } bool WrapperAnswer::RecvHas(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs, bool* foundp) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); *foundp = false; RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.has(%s)", ReceiverObj(objId), Identifier(idVar)); RootedId id(cx); if (!fromJSIDVariant(cx, idVar, &id)) return fail(jsapi, rs); if (!JS_HasPropertyById(cx, obj, id, foundp)) return fail(jsapi, rs); return ok(rs); } bool WrapperAnswer::RecvHasOwn(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs, bool* foundp) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); *foundp = false; RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.hasOwn(%s)", ReceiverObj(objId), Identifier(idVar)); RootedId id(cx); if (!fromJSIDVariant(cx, idVar, &id)) return fail(jsapi, rs); if (!JS_HasOwnPropertyById(cx, obj, id, foundp)) return fail(jsapi, rs); return ok(rs); } bool WrapperAnswer::RecvGet(const ObjectId& objId, const JSVariant& receiverVar, const JSIDVariant& idVar, ReturnStatus* rs, JSVariant* result) { MaybeForceDebugGC(); // We may run scripted getters. AutoEntryScript aes(scopeForTargetObjects(), "Cross-Process Object Wrapper 'get'"); JSContext* cx = aes.cx(); // The outparam will be written to the buffer, so it must be set even if // the parent won't read it. *result = UndefinedVariant(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(aes, rs); RootedValue receiver(cx); if (!fromVariant(cx, receiverVar, &receiver)) return fail(aes, rs); RootedId id(cx); if (!fromJSIDVariant(cx, idVar, &id)) return fail(aes, rs); JS::RootedValue val(cx); if (!JS_ForwardGetPropertyTo(cx, obj, id, receiver, &val)) return fail(aes, rs); if (!toVariant(cx, val, result)) return fail(aes, rs); LOG("get %s.%s = %s", ReceiverObj(objId), Identifier(idVar), OutVariant(*result)); return ok(rs); } bool WrapperAnswer::RecvSet(const ObjectId& objId, const JSIDVariant& idVar, const JSVariant& value, const JSVariant& receiverVar, ReturnStatus* rs) { MaybeForceDebugGC(); // We may run scripted setters. AutoEntryScript aes(scopeForTargetObjects(), "Cross-Process Object Wrapper 'set'"); JSContext* cx = aes.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(aes, rs); LOG("set %s[%s] = %s", ReceiverObj(objId), Identifier(idVar), InVariant(value)); RootedId id(cx); if (!fromJSIDVariant(cx, idVar, &id)) return fail(aes, rs); RootedValue val(cx); if (!fromVariant(cx, value, &val)) return fail(aes, rs); RootedValue receiver(cx); if (!fromVariant(cx, receiverVar, &receiver)) return fail(aes, rs); ObjectOpResult result; if (!JS_ForwardSetPropertyTo(cx, obj, id, val, receiver, result)) return fail(aes, rs); return ok(rs, result); } bool WrapperAnswer::RecvIsExtensible(const ObjectId& objId, ReturnStatus* rs, bool* result) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); *result = false; RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.isExtensible()", ReceiverObj(objId)); bool extensible; if (!JS_IsExtensible(cx, obj, &extensible)) return fail(jsapi, rs); *result = !!extensible; return ok(rs); } bool WrapperAnswer::RecvCallOrConstruct(const ObjectId& objId, InfallibleTArray<JSParam>&& argv, const bool& construct, ReturnStatus* rs, JSVariant* result, nsTArray<JSParam>* outparams) { MaybeForceDebugGC(); AutoEntryScript aes(scopeForTargetObjects(), "Cross-Process Object Wrapper call/construct"); JSContext* cx = aes.cx(); // The outparam will be written to the buffer, so it must be set even if // the parent won't read it. *result = UndefinedVariant(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(aes, rs); MOZ_ASSERT(argv.Length() >= 2); RootedValue objv(cx); if (!fromVariant(cx, argv[0], &objv)) return fail(aes, rs); *result = JSVariant(UndefinedVariant()); AutoValueVector vals(cx); AutoValueVector outobjects(cx); for (size_t i = 0; i < argv.Length(); i++) { if (argv[i].type() == JSParam::Tvoid_t) { // This is an outparam. RootedObject obj(cx, xpc::NewOutObject(cx)); if (!obj) return fail(aes, rs); if (!outobjects.append(ObjectValue(*obj))) return fail(aes, rs); if (!vals.append(ObjectValue(*obj))) return fail(aes, rs); } else { RootedValue v(cx); if (!fromVariant(cx, argv[i].get_JSVariant(), &v)) return fail(aes, rs); if (!vals.append(v)) return fail(aes, rs); } } RootedValue rval(cx); { HandleValueArray args = HandleValueArray::subarray(vals, 2, vals.length() - 2); if (construct) { RootedObject obj(cx); if (!JS::Construct(cx, vals[0], args, &obj)) return fail(aes, rs); rval.setObject(*obj); } else { if(!JS::Call(cx, vals[1], vals[0], args, &rval)) return fail(aes, rs); } } if (!toVariant(cx, rval, result)) return fail(aes, rs); // Prefill everything with a dummy jsval. for (size_t i = 0; i < outobjects.length(); i++) outparams->AppendElement(JSParam(void_t())); // Go through each argument that was an outparam, retrieve the "value" // field, and add it to a temporary list. We need to do this separately // because the outparams vector is not rooted. vals.clear(); for (size_t i = 0; i < outobjects.length(); i++) { RootedObject obj(cx, &outobjects[i].toObject()); RootedValue v(cx); bool found; if (JS_HasProperty(cx, obj, "value", &found)) { if (!JS_GetProperty(cx, obj, "value", &v)) return fail(aes, rs); } else { v = UndefinedValue(); } if (!vals.append(v)) return fail(aes, rs); } // Copy the outparams. If any outparam is already set to a void_t, we // treat this as the outparam never having been set. for (size_t i = 0; i < vals.length(); i++) { JSVariant variant; if (!toVariant(cx, vals[i], &variant)) return fail(aes, rs); outparams->ReplaceElementAt(i, JSParam(variant)); } LOG("%s.call(%s) = %s", ReceiverObj(objId), argv, OutVariant(*result)); return ok(rs); } bool WrapperAnswer::RecvHasInstance(const ObjectId& objId, const JSVariant& vVar, ReturnStatus* rs, bool* bp) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.hasInstance(%s)", ReceiverObj(objId), InVariant(vVar)); RootedValue val(cx); if (!fromVariant(cx, vVar, &val)) return fail(jsapi, rs); if (!JS_HasInstance(cx, obj, val, bp)) return fail(jsapi, rs); return ok(rs); } bool WrapperAnswer::RecvGetBuiltinClass(const ObjectId& objId, ReturnStatus* rs, uint32_t* classValue) { MaybeForceDebugGC(); *classValue = uint32_t(js::ESClass::Other); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.getBuiltinClass()", ReceiverObj(objId)); js::ESClass cls; if (!js::GetBuiltinClass(cx, obj, &cls)) return fail(jsapi, rs); *classValue = uint32_t(cls); return ok(rs); } bool WrapperAnswer::RecvIsArray(const ObjectId& objId, ReturnStatus* rs, uint32_t* ans) { MaybeForceDebugGC(); *ans = uint32_t(IsArrayAnswer::NotArray); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.isArray()", ReceiverObj(objId)); IsArrayAnswer answer; if (!JS::IsArray(cx, obj, &answer)) return fail(jsapi, rs); *ans = uint32_t(answer); return ok(rs); } bool WrapperAnswer::RecvClassName(const ObjectId& objId, nsCString* name) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) { // This is very unfortunate, but we have no choice. *name = "<dead CPOW>"; return true; } LOG("%s.className()", ReceiverObj(objId)); *name = js::ObjectClassName(cx, obj); return true; } bool WrapperAnswer::RecvGetPrototype(const ObjectId& objId, ReturnStatus* rs, ObjectOrNullVariant* result) { MaybeForceDebugGC(); *result = NullVariant(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); JS::RootedObject proto(cx); if (!JS_GetPrototype(cx, obj, &proto)) return fail(jsapi, rs); if (!toObjectOrNullVariant(cx, proto, result)) return fail(jsapi, rs); LOG("getPrototype(%s)", ReceiverObj(objId)); return ok(rs); } bool WrapperAnswer::RecvGetPrototypeIfOrdinary(const ObjectId& objId, ReturnStatus* rs, bool* isOrdinary, ObjectOrNullVariant* result) { MaybeForceDebugGC(); *result = NullVariant(); *isOrdinary = false; AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); JS::RootedObject proto(cx); if (!JS_GetPrototypeIfOrdinary(cx, obj, isOrdinary, &proto)) return fail(jsapi, rs); if (!toObjectOrNullVariant(cx, proto, result)) return fail(jsapi, rs); LOG("getPrototypeIfOrdinary(%s)", ReceiverObj(objId)); return ok(rs); } bool WrapperAnswer::RecvRegExpToShared(const ObjectId& objId, ReturnStatus* rs, nsString* source, uint32_t* flags) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); RootedString sourceJSStr(cx, JS_GetRegExpSource(cx, obj)); if (!sourceJSStr) return fail(jsapi, rs); nsAutoJSString sourceStr; if (!sourceStr.init(cx, sourceJSStr)) return fail(jsapi, rs); source->Assign(sourceStr); *flags = JS_GetRegExpFlags(cx, obj); return ok(rs); } bool WrapperAnswer::RecvGetPropertyKeys(const ObjectId& objId, const uint32_t& flags, ReturnStatus* rs, nsTArray<JSIDVariant>* ids) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.getPropertyKeys()", ReceiverObj(objId)); AutoIdVector props(cx); if (!js::GetPropertyKeys(cx, obj, flags, &props)) return fail(jsapi, rs); for (size_t i = 0; i < props.length(); i++) { JSIDVariant id; if (!toJSIDVariant(cx, props[i], &id)) return fail(jsapi, rs); ids->AppendElement(id); } return ok(rs); } bool WrapperAnswer::RecvInstanceOf(const ObjectId& objId, const JSIID& iid, ReturnStatus* rs, bool* instanceof) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); *instanceof = false; RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.instanceOf()", ReceiverObj(objId)); nsID nsiid; ConvertID(iid, &nsiid); nsresult rv = xpc::HasInstance(cx, obj, &nsiid, instanceof); if (rv != NS_OK) return fail(jsapi, rs); return ok(rs); } bool WrapperAnswer::RecvDOMInstanceOf(const ObjectId& objId, const int& prototypeID, const int& depth, ReturnStatus* rs, bool* instanceof) { MaybeForceDebugGC(); AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects()))) return false; JSContext* cx = jsapi.cx(); *instanceof = false; RootedObject obj(cx, findObjectById(cx, objId)); if (!obj) return deadCPOW(jsapi, rs); LOG("%s.domInstanceOf()", ReceiverObj(objId)); bool tmp; if (!mozilla::dom::InterfaceHasInstance(cx, prototypeID, depth, obj, &tmp)) return fail(jsapi, rs); *instanceof = tmp; return ok(rs); } bool WrapperAnswer::RecvDropObject(const ObjectId& objId) { JSObject* obj = objects_.find(objId); if (obj) { objectIdMap(objId.hasXrayWaiver()).remove(obj); objects_.remove(objId); } return true; }