From e511e91dea83cf950c273ba4b931167cad4edc6a Mon Sep 17 00:00:00 2001 From: Jan Grulich Date: Mon, 8 Jul 2024 09:32:57 +0200 Subject: [PATCH] HTTP2: Delay any communication until encrypted() can be responded to Resolves: CVE-2024-39936 --- CVE-2024-39936.patch | 232 +++++++++++++++++++++++++++++++++++++++++++ qt6-qtbase.spec | 7 +- 2 files changed, 238 insertions(+), 1 deletion(-) create mode 100644 CVE-2024-39936.patch diff --git a/CVE-2024-39936.patch b/CVE-2024-39936.patch new file mode 100644 index 0000000..c97f2f6 --- /dev/null +++ b/CVE-2024-39936.patch @@ -0,0 +1,232 @@ +From b1e75376cc3adfc7da5502a277dfe9711f3e0536 Mon Sep 17 00:00:00 2001 +From: Mårten Nordheim +Date: Tue, 25 Jun 2024 17:09:35 +0200 +Subject: [PATCH] HTTP2: Delay any communication until encrypted() can be responded to + +We have the encrypted() signal that lets users do extra checks on the +established connection. It is emitted as BlockingQueued, so the HTTP +thread stalls until it is done emitting. Users can potentially call +abort() on the QNetworkReply at that point, which is passed as a Queued +call back to the HTTP thread. That means that any currently queued +signal emission will be processed before the abort() call is processed. + +In the case of HTTP2 it is a little special since it is multiplexed and +the code is built to start requests as they are available. This means +that, while the code worked fine for HTTP1, since one connection only +has one request, it is not working for HTTP2, since we try to send more +requests in-between the encrypted() signal and the abort() call. + +This patch changes the code to delay any communication until the +encrypted() signal has been emitted and processed, for HTTP2 only. +It's done by adding a few booleans, both to know that we have to return +early and so we can keep track of what events arose and what we need to +resume once enough time has passed that any abort() call must have been +processed. + +Fixes: QTBUG-126610 +Pick-to: 6.8 6.7 6.5 6.2 5.15 5.12 +Change-Id: Ic25a600c278203256e35f541026f34a8783235ae +Reviewed-by: Marc Mutz +Reviewed-by: Volker Hilsheimer +--- + +diff --git a/src/network/access/qhttp2protocolhandler.cpp b/src/network/access/qhttp2protocolhandler.cpp +index 484f18de..d62529a3 100644 +--- a/src/network/access/qhttp2protocolhandler.cpp ++++ b/src/network/access/qhttp2protocolhandler.cpp +@@ -339,12 +339,12 @@ bool QHttp2ProtocolHandler::sendRequest() + } + } + +- if (!prefaceSent && !sendClientPreface()) +- return false; +- + if (!requests.size()) + return true; + ++ if (!prefaceSent && !sendClientPreface()) ++ return false; ++ + m_channel->state = QHttpNetworkConnectionChannel::WritingState; + // Check what was promised/pushed, maybe we do not have to send a request + // and have a response already? +diff --git a/src/network/access/qhttpnetworkconnectionchannel.cpp b/src/network/access/qhttpnetworkconnectionchannel.cpp +index 14b5b861..c01d4623 100644 +--- a/src/network/access/qhttpnetworkconnectionchannel.cpp ++++ b/src/network/access/qhttpnetworkconnectionchannel.cpp +@@ -209,6 +209,10 @@ void QHttpNetworkConnectionChannel::abort() + bool QHttpNetworkConnectionChannel::sendRequest() + { + Q_ASSERT(protocolHandler); ++ if (waitingForPotentialAbort) { ++ needInvokeSendRequest = true; ++ return false; // this return value is unused ++ } + return protocolHandler->sendRequest(); + } + +@@ -221,21 +225,28 @@ bool QHttpNetworkConnectionChannel::sendRequest() + void QHttpNetworkConnectionChannel::sendRequestDelayed() + { + QMetaObject::invokeMethod(this, [this] { +- Q_ASSERT(protocolHandler); + if (reply) +- protocolHandler->sendRequest(); ++ sendRequest(); + }, Qt::ConnectionType::QueuedConnection); + } + + void QHttpNetworkConnectionChannel::_q_receiveReply() + { + Q_ASSERT(protocolHandler); ++ if (waitingForPotentialAbort) { ++ needInvokeReceiveReply = true; ++ return; ++ } + protocolHandler->_q_receiveReply(); + } + + void QHttpNetworkConnectionChannel::_q_readyRead() + { + Q_ASSERT(protocolHandler); ++ if (waitingForPotentialAbort) { ++ needInvokeReadyRead = true; ++ return; ++ } + protocolHandler->_q_readyRead(); + } + +@@ -1241,7 +1252,18 @@ void QHttpNetworkConnectionChannel::_q_encrypted() + // Similar to HTTP/1.1 counterpart below: + const auto &h2Pairs = h2RequestsToSend.values(); // (request, reply) + const auto &pair = h2Pairs.first(); ++ waitingForPotentialAbort = true; + emit pair.second->encrypted(); ++ ++ // We don't send or handle any received data until any effects from ++ // emitting encrypted() have been processed. This is necessary ++ // because the user may have called abort(). We may also abort the ++ // whole connection if the request has been aborted and there is ++ // no more requests to send. ++ QMetaObject::invokeMethod(this, ++ &QHttpNetworkConnectionChannel::checkAndResumeCommunication, ++ Qt::QueuedConnection); ++ + // In case our peer has sent us its settings (window size, max concurrent streams etc.) + // let's give _q_receiveReply a chance to read them first ('invokeMethod', QueuedConnection). + } +@@ -1259,6 +1281,28 @@ void QHttpNetworkConnectionChannel::_q_encrypted() + QMetaObject::invokeMethod(connection, "_q_startNextRequest", Qt::QueuedConnection); + } + ++ ++void QHttpNetworkConnectionChannel::checkAndResumeCommunication() ++{ ++ Q_ASSERT(connection->connectionType() == QHttpNetworkConnection::ConnectionTypeHTTP2 ++ || connection->connectionType() == QHttpNetworkConnection::ConnectionTypeHTTP2Direct); ++ ++ // Because HTTP/2 requires that we send a SETTINGS frame as the first thing we do, and respond ++ // to a SETTINGS frame with an ACK, we need to delay any handling until we can ensure that any ++ // effects from emitting encrypted() have been processed. ++ // This function is called after encrypted() was emitted, so check for changes. ++ ++ if (!reply && h2RequestsToSend.isEmpty()) ++ abort(); ++ waitingForPotentialAbort = false; ++ if (needInvokeReadyRead) ++ _q_readyRead(); ++ if (needInvokeReceiveReply) ++ _q_receiveReply(); ++ if (needInvokeSendRequest) ++ sendRequest(); ++} ++ + void QHttpNetworkConnectionChannel::requeueHttp2Requests() + { + QList h2Pairs = h2RequestsToSend.values(); +diff --git a/src/network/access/qhttpnetworkconnectionchannel_p.h b/src/network/access/qhttpnetworkconnectionchannel_p.h +index 0772a445..2a5336ca 100644 +--- a/src/network/access/qhttpnetworkconnectionchannel_p.h ++++ b/src/network/access/qhttpnetworkconnectionchannel_p.h +@@ -73,6 +73,10 @@ public: + QAbstractSocket *socket; + bool ssl; + bool isInitialized; ++ bool waitingForPotentialAbort = false; ++ bool needInvokeReceiveReply = false; ++ bool needInvokeReadyRead = false; ++ bool needInvokeSendRequest = false; + ChannelState state; + QHttpNetworkRequest request; // current request, only used for HTTP + QHttpNetworkReply *reply; // current reply for this request, only used for HTTP +@@ -145,6 +149,8 @@ public: + void closeAndResendCurrentRequest(); + void resendCurrentRequest(); + ++ void checkAndResumeCommunication(); ++ + bool isSocketBusy() const; + bool isSocketWriting() const; + bool isSocketWaiting() const; +diff --git a/tests/auto/network/access/http2/tst_http2.cpp b/tests/auto/network/access/http2/tst_http2.cpp +index b6f66942..7f135bf6 100644 +--- a/tests/auto/network/access/http2/tst_http2.cpp ++++ b/tests/auto/network/access/http2/tst_http2.cpp +@@ -103,6 +103,8 @@ private slots: + + void duplicateRequestsWithAborts(); + ++ void abortOnEncrypted(); ++ + protected slots: + // Slots to listen to our in-process server: + void serverStarted(quint16 port); +@@ -1393,6 +1395,48 @@ void tst_Http2::duplicateRequestsWithAborts() + QCOMPARE(finishedCount, ExpectedSuccessfulRequests); + } + ++void tst_Http2::abortOnEncrypted() ++{ ++#if !QT_CONFIG(ssl) ++ QSKIP("TLS support is needed for this test"); ++#else ++ clearHTTP2State(); ++ serverPort = 0; ++ ++ ServerPtr targetServer(newServer(defaultServerSettings, H2Type::h2Direct)); ++ ++ QMetaObject::invokeMethod(targetServer.data(), "startServer", Qt::QueuedConnection); ++ runEventLoop(); ++ ++ nRequests = 1; ++ nSentRequests = 0; ++ ++ const auto url = requestUrl(H2Type::h2Direct); ++ QNetworkRequest request(url); ++ request.setAttribute(QNetworkRequest::Http2DirectAttribute, true); ++ ++ std::unique_ptr reply{manager->get(request)}; ++ reply->ignoreSslErrors(); ++ connect(reply.get(), &QNetworkReply::encrypted, reply.get(), [reply = reply.get()](){ ++ reply->abort(); ++ }); ++ connect(reply.get(), &QNetworkReply::errorOccurred, this, &tst_Http2::replyFinishedWithError); ++ ++ runEventLoop(); ++ STOP_ON_FAILURE ++ ++ QCOMPARE(nRequests, 0); ++ QCOMPARE(reply->error(), QNetworkReply::OperationCanceledError); ++ ++ const bool res = QTest::qWaitFor( ++ [this, server = targetServer.get()]() { ++ return serverGotSettingsACK || prefaceOK || nSentRequests > 0; ++ }, ++ 500); ++ QVERIFY(!res); ++#endif // QT_CONFIG(ssl) ++} ++ + void tst_Http2::serverStarted(quint16 port) + { + serverPort = port; diff --git a/qt6-qtbase.spec b/qt6-qtbase.spec index b0767d8..fa507f8 100644 --- a/qt6-qtbase.spec +++ b/qt6-qtbase.spec @@ -38,7 +38,7 @@ BuildRequires: pkgconfig(libsystemd) Name: qt6-qtbase Summary: Qt6 - QtBase components Version: 6.6.2 -Release: 1%{?dist} +Release: 2%{?dist} License: LGPL-3.0-only OR GPL-3.0-only WITH Qt-GPL-exception-1.0 Url: http://qt-project.org/ @@ -97,6 +97,7 @@ Patch100: qtbase-use-qgnomeplatform-as-default-platform-theme-on-gnome.patch %endif ## upstream patches +Patch200: CVE-2024-39936.patch # Do not check any files in %%{_qt6_plugindir}/platformthemes/ for requires. # Those themes are there for platform integration. If the required libraries are @@ -837,6 +838,10 @@ make check -k ||: %changelog +* Mon Jul 08 2024 Jan Grulich - 6.6.2-1 +- HTTP2: Delay any communication until encrypted() can be responded to + Resolves: CVE-2024-39936 + * Thu Feb 15 2024 Jan Grulich - 6.6.2-1 - 6.6.2