testStructuredCloneReader.cpp (2643B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- 2 * vim: set ts=8 sts=2 et sw=2 tw=80: 3 */ 4 /* This Source Code Form is subject to the terms of the Mozilla Public 5 * License, v. 2.0. If a copy of the MPL was not distributed with this 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 7 8 #include "mozilla/ScopeExit.h" 9 10 #include "jsapi.h" 11 12 #include "fuzz-tests/tests.h" 13 #include "js/StructuredClone.h" 14 #include "vm/Interpreter.h" 15 16 #include "vm/JSContext-inl.h" 17 18 using namespace js; 19 20 // These are defined and pre-initialized by the harness (in tests.cpp). 21 extern JS::PersistentRootedObject gGlobal; 22 extern JSContext* gCx; 23 24 static int testStructuredCloneReaderInit(int* argc, char*** argv) { return 0; } 25 26 static int testStructuredCloneReaderFuzz(const uint8_t* buf, size_t size) { 27 auto gcGuard = mozilla::MakeScopeExit([&] { 28 JS::PrepareForFullGC(gCx); 29 JS::NonIncrementalGC(gCx, JS::GCOptions::Normal, JS::GCReason::API); 30 }); 31 32 if (!size) return 0; 33 34 // Make sure to pad the buffer to a multiple of kSegmentAlignment 35 const size_t kSegmentAlignment = 8; 36 size_t buf_size = RoundUp(size, kSegmentAlignment); 37 38 JS::StructuredCloneScope scope = JS::StructuredCloneScope::DifferentProcess; 39 40 auto clonebuf = MakeUnique<JSStructuredCloneData>(scope); 41 if (!clonebuf || !clonebuf->Init(buf_size)) { 42 ReportOutOfMemory(gCx); 43 return 0; 44 } 45 46 // Copy buffer then pad with zeroes. 47 if (!clonebuf->AppendBytes((const char*)buf, size)) { 48 ReportOutOfMemory(gCx); 49 return 0; 50 } 51 char padding[kSegmentAlignment] = {0}; 52 if (!clonebuf->AppendBytes(padding, buf_size - size)) { 53 ReportOutOfMemory(gCx); 54 return 0; 55 } 56 57 JS::CloneDataPolicy policy; 58 RootedValue deserialized(gCx); 59 if (!JS_ReadStructuredClone(gCx, *clonebuf, JS_STRUCTURED_CLONE_VERSION, 60 scope, &deserialized, policy, nullptr, nullptr)) { 61 return 0; 62 } 63 64 /* If we succeeded in deserializing, we should try to reserialize the data. 65 This has two main advantages: 66 67 1) It tests parts of the serializer as well. 68 2) The deserialized data is actually used, making it more likely to detect 69 further memory-related problems. 70 71 Tests show that this also doesn't cause a serious performance penalty. 72 */ 73 mozilla::Maybe<JSAutoStructuredCloneBuffer> clonebufOut; 74 75 clonebufOut.emplace(scope, nullptr, nullptr); 76 if (!clonebufOut->write(gCx, deserialized, UndefinedHandleValue, policy)) { 77 return 0; 78 } 79 80 return 0; 81 } 82 83 MOZ_FUZZING_INTERFACE_RAW(testStructuredCloneReaderInit, 84 testStructuredCloneReaderFuzz, StructuredCloneReader);