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bz#1518958, backport to fix out of bounds reads in qdnslookup_unix

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Than Ngo 2017-11-30 09:29:47 +01:00
parent 8cedb395cf
commit 923ba9b0e0
2 changed files with 56 additions and 1 deletions
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7
qt5-qtbase.spec
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@ -55,7 +55,7 @@ BuildRequires: pkgconfig(libsystemd)
Name: qt5-qtbase
Summary: Qt5 - QtBase components
Version: 5.9.3
Release: 1%{?dist}
Release: 2%{?dist}
# See LGPL_EXCEPTIONS.txt, for exception details
License: LGPLv2 with exceptions or GPLv3 with exceptions
@ -116,6 +116,7 @@ Patch66: qtbase-mariadb.patch
Patch67: https://bugreports.qt.io/secure/attachment/66353/xcberror_filter.patch
## upstream patches (5.9 branch)
Patch100: qtbase-opensource-src-5.9.3-QTBUG-64742-out-of-bounds-in-qdnslookup_unix.patch
# Do not check any files in %%{_qt5_plugindir}/platformthemes/ for requires.
# Those themes are there for platform integration. If the required libraries are
@ -362,6 +363,7 @@ Qt5 libraries used for drawing widgets and OpenGL items.
%endif
%patch66 -p1 -b .mariadb
%patch67 -p1 -b .xcberror_filter
%patch100 -p1 -b .QTBUG-64742-out-of-bounds-in-qdnslookup_unix
%if 0%{?inject_optflags}
## adjust $RPM_OPT_FLAGS
@ -979,6 +981,9 @@ fi
%changelog
* Thu Nov 30 2017 Than Ngo <than@redhat.com> - 5.9.3-2
- bz#1518958, backport to fix out of bounds reads in qdnslookup_unix
* Wed Nov 22 2017 Jan Grulich <jgrulich@redhat.com> - 5.9.3-1
- 5.9.3

50
qtbase-opensource-src-5.9.3-QTBUG-64742-out-of-bounds-in-qdnslookup_unix.patch Normal file
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@ -0,0 +1,50 @@
diff -up qtbase-opensource-src-5.9.3/src/network/kernel/qdnslookup_unix.cpp.orig qtbase-opensource-src-5.9.3/src/network/kernel/qdnslookup_unix.cpp
--- qtbase-opensource-src-5.9.3/src/network/kernel/qdnslookup_unix.cpp.orig 2017-11-16 06:15:28.000000000 +0100
+++ qtbase-opensource-src-5.9.3/src/network/kernel/qdnslookup_unix.cpp 2017-11-30 09:22:47.525741040 +0100
@@ -42,6 +42,7 @@
#if QT_CONFIG(library)
#include <qlibrary.h>
#endif
+#include <qvarlengtharray.h>
#include <qscopedpointer.h>
#include <qurl.h>
#include <private/qnativesocketengine_p.h>
@@ -58,6 +59,8 @@
# include <gnu/lib-names.h>
#endif
+#include <cstring>
+
QT_BEGIN_NAMESPACE
#if QT_CONFIG(library)
@@ -189,11 +192,25 @@ void QDnsLookupRunnable::query(const int
QScopedPointer<struct __res_state, QDnsLookupStateDeleter> state_ptr(&state);
// Perform DNS query.
- unsigned char response[PACKETSZ];
- memset(response, 0, sizeof(response));
- const int responseLength = local_res_nquery(&state, requestName, C_IN, requestType, response, sizeof(response));
+ QVarLengthArray<unsigned char, PACKETSZ> buffer(PACKETSZ);
+ memset(buffer.data(), 0, buffer.size());
+ int responseLength = local_res_nquery(&state, requestName, C_IN, requestType, buffer.data(), buffer.size());
+ if (Q_UNLIKELY(responseLength > PACKETSZ)) {
+ buffer.resize(responseLength);
+ memset(buffer.data(), 0, buffer.size());
+ responseLength = local_res_nquery(&state, requestName, C_IN, requestType, buffer.data(), buffer.size());
+ if (Q_UNLIKELY(responseLength > buffer.size())) {
+ // Ok, we give up.
+ reply->error = QDnsLookup::ResolverError;
+ reply->errorString.clear(); // We cannot be more specific, alas.
+ return;
+ }
+ }
- // Check the response header.
+ unsigned char *response = buffer.data();
+ // Check the response header. Though res_nquery returns -1 as a
+ // responseLength in case of error, we still can extract the
+ // exact error code from the response.
HEADER *header = (HEADER*)response;
const int answerCount = ntohs(header->ancount);
switch (header->rcode) {