Bug 220400 – [CoreIPC] null-ptr in IPC::createArchiveList

• Component: WebKit2
• Status: RESOLVED FIXED

[Ryosuke Niwa]

Created attachment 417158 [details]
Test (requires WTR in macOS)

Using the new IPC testing code I added in https://trac.webkit.org/r268239,
we can reproduce the following crash in macOS ASAN builds:

ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fff203e9144 bp 0x7ffee7d4c6f0 sp 0x7ffee7d4c6c0 T0)

    #0 0x7fff203e9144 in CFDictionaryGetValue+0x21 (CoreFoundation:x86_64h+0x8144)
    #1 0x1133c5b8e in IPC::createArchiveList(__CFDictionary const*, void const*, long*, void const***, long*, __CFDictionary const**, __CFNumber const**, __CFString const**) WebCoreArgumentCodersMac.mm:108
    #2 0x1133c57f3 in IPC::createCFURLRequestFromSerializableRepresentation(__CFDictionary const*, void const*) WebCoreArgumentCodersMac.mm:170
    #3 0x1133b71b7 in IPC::createNSURLRequestFromSerializableRepresentation(__CFDictionary const*, void const*) WebCoreArgumentCodersMac.mm:185
    #4 0x1133b69dd in IPC::ArgumentCoder<WebCore::ResourceRequest>::decodePlatformData(IPC::Decoder&, WebCore::ResourceRequest&) WebCoreArgumentCodersMac.mm:234
    #5 0x1146ee151 in IPC::ArgumentCoder<WebCore::ResourceRequest>::decode(IPC::Decoder&, WebCore::ResourceRequest&) WebCoreArgumentCoders.cpp:1270
    #6 0x112359f8b in IPC::Decoder& IPC::Decoder::operator>><WebCore::ResourceRequest, (void*)0>(WTF::Optional<WebCore::ResourceRequest>&) Decoder.h:161
    #7 0x113497604 in WebKit::FrameInfoData::decode(IPC::Decoder&) FrameInfoData.cpp:50
    #8 0x1125d4bbd in WTF::Optional<WebKit::FrameInfoData> IPC::ArgumentCoder<WebKit::FrameInfoData>::decode<WebKit::FrameInfoData, (void*)0>(IPC::Decoder&) ArgumentCoder.h:111
    #9 0x1125d4779 in IPC::Decoder& IPC::Decoder::operator>><WebKit::FrameInfoData, (void*)0>(WTF::Optional<WebKit::FrameInfoData>&) Decoder.h:153
    #10 0x11460e156 in IPC::TupleDecoderImpl<WebKit::FrameInfoData, WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::PublicKeyCredentialRequestOptions, bool>::decode(IPC::Decoder&) ArgumentCoders.h:296
    #11 0x11460de2e in IPC::TupleDecoderImpl<WTF::ObjectIdentifier<WebCore::FrameIdentifierType>, WebKit::FrameInfoData, WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::PublicKeyCredentialRequestOptions, bool>::decode(IPC::Decoder&) ArgumentCoders.h:300
    #12 0x11460dc7d in IPC::TupleDecoder<5ul, WTF::ObjectIdentifier<WebCore::FrameIdentifierType>, WebKit::FrameInfoData, WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::PublicKeyCredentialRequestOptions, bool>::decode(IPC::Decoder&) ArgumentCoders.h:324
    #13 0x11460db9d in IPC::ArgumentCoder<std::__1::tuple<WTF::ObjectIdentifier<WebCore::FrameIdentifierType>, WebKit::FrameInfoData, WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::PublicKeyCredentialRequestOptions, bool> >::decode(IPC::Decoder&) ArgumentCoders.h:344
    #14 0x11460d952 in IPC::Decoder& IPC::Decoder::operator>><std::__1::tuple<WTF::ObjectIdentifier<WebCore::FrameIdentifierType>, WebKit::FrameInfoData, WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::PublicKeyCredentialRequestOptions, bool>, (void*)0>(WTF::Optional<std::__1::tuple<WTF::ObjectIdentifier<WebCore::FrameIdentifierType>, WebKit::FrameInfoData, WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::PublicKeyCredentialRequestOptions, bool> >&) Decoder.h:153
    #15 0x114608ef7 in void IPC::handleMessageAsync<Messages::WebAuthenticatorCoordinatorProxy::GetAssertion, WebKit::WebAuthenticatorCoordinatorProxy, void (WebKit::WebAuthenticatorCoordinatorProxy::*)(WTF::ObjectIdentifier<WebCore::FrameIdentifierType>, WebKit::FrameInfoData&&, WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&&, WebCore::PublicKeyCredentialRequestOptions&&, bool, WTF::CompletionHandler<void (WebCore::AuthenticatorResponseData const&, WebCore::ExceptionData const&)>&&)>(IPC::Connection&, IPC::Decoder&, WebKit::WebAuthenticatorCoordinatorProxy*, void (WebKit::WebAuthenticatorCoordinatorProxy::*)(WTF::ObjectIdentifier<WebCore::FrameIdentifierType>, WebKit::FrameInfoData&&, WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&&, WebCore::PublicKeyCredentialRequestOptions&&, bool, WTF::CompletionHandler<void (WebCore::AuthenticatorResponseData const&, WebCore::ExceptionData const&)>&&)) HandleMessage.h:178
    #16 0x114608a0d in WebKit::WebAuthenticatorCoordinatorProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) WebAuthenticatorCoordinatorProxyMessageReceiver.cpp:146
    #17 0x11284c285 in IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) MessageReceiverMap.cpp:123
    #18 0x1137757fc in WebKit::AuxiliaryProcessProxy::dispatchMessage(IPC::Connection&, IPC::Decoder&) AuxiliaryProcessProxy.cpp:216
    #19 0x113b57367 in WebKit::WebProcessProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) WebProcessProxy.cpp:808
    #20 0x112374b93 in IPC::Connection::dispatchMessage(IPC::Decoder&) Connection.cpp:1039
    #21 0x112376507 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) Connection.cpp:1139
    #22 0x112373319 in IPC::Connection::dispatchIncomingMessages() Connection.cpp:1243
    #23 0x1123955ee in IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_8::operator()() Connection.cpp:1000
    #24 0x11239555c in WTF::Detail::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_8, void>::call() Function.h:52
    #25 0x109c695ce in WTF::Function<void ()>::operator()() const Function.h:83
    #26 0x109d02a28 in WTF::RunLoop::performWork() RunLoop.cpp:128
    #27 0x109d05d45 in WTF::RunLoop::performWork(void*) RunLoopCF.cpp:46
    #28 0x7fff20462a0b in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__+0x10 (CoreFoundation:x86_64h+0x81a0b)
    #29 0x7fff20462973 in __CFRunLoopDoSource0+0xb3 (CoreFoundation:x86_64h+0x81973)
    #30 0x7fff204626ee in __CFRunLoopDoSources0+0xf7 (CoreFoundation:x86_64h+0x816ee)
    #31 0x7fff20461120 in __CFRunLoopRun+0x379 (CoreFoundation:x86_64h+0x80120)
    #32 0x7fff204606cd in CFRunLoopRunSpecific+0x232 (CoreFoundation:x86_64h+0x7f6cd)
    #33 0x7fff211edfa0 in -[NSRunLoop(NSRunLoop) runMode:beforeDate:]+0xd3 (Foundation:x86_64+0x5ffa0)
    #34 0x107f77006 in WTR::TestController::platformRunUntil(bool&, WTF::Seconds) TestControllerCocoa.mm:225
    #35 0x107f2183a in WTR::TestController::runUntil(bool&, WTF::Seconds) TestController.cpp:1546
    #36 0x107f996cd in WTR::TestInvocation::invoke() TestInvocation.cpp:168
    #37 0x107f2e541 in WTR::TestController::runTest(char const*) TestController.cpp:1476
    #38 0x107f2269d in WTR::TestController::run() TestController.cpp:1533
    #39 0x107f21c01 in WTR::TestController::TestController(int, char const**) TestController.cpp:193
    #40 0x107f22708 in WTR::TestController::TestController(int, char const**) TestController.cpp:190
    #41 0x107ebd0aa in main main.mm:70

<rdar://problem/70476922>

[Rob Buis]

Created attachment 417824 [details]
Patch

[youenn fablet]

Comment on attachment 417824 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=417824&action=review

> Source/WebKit/Shared/mac/WebCoreArgumentCodersMac.mm:235
> +        return false;

Seems fine like this.
Looking at a few place, we sometimes do check for dictionary being null before encoding it and we are not doing it everywhere (FontInfo::decode or SecItemRequestData::decode).
In that particular case, we would not need to encode this boolean at all so there might be a small gain to have explicit checks.

[Rob Buis]

Created attachment 417861 [details]
Patch

[EWS]

Committed r271597: <https://trac.webkit.org/changeset/271597>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 417861 [details].