MSVSphere Packaging Team
8 months ago
parent
058aef5552
commit
a6191720a5
@ -0,0 +1,38 @@
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From ea63c28efc1d2ecb467b83a34923d12462efa96f Mon Sep 17 00:00:00 2001
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From: Marc Mutz <marc.mutz@qt.io>
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Date: Tue, 12 Dec 2023 20:51:56 +0100
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Subject: [PATCH] HPack: fix a Yoda Condition
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Putting the variable on the LHS of a relational operation makes the
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expression easier to read. In this case, we find that the whole
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expression is nonsensical as an overflow protection, because if
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name.size() + value.size() overflows, the result will exactly _not_
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be > max() - 32, because UB will have happened.
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To be fixed in a follow-up commit.
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As a drive-by, add parentheses around the RHS.
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Change-Id: I35ce598884c37c51b74756b3bd2734b9aad63c09
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Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
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(cherry picked from commit 658607a34ead214fbacbc2cca44915655c318ea9)
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Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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(cherry picked from commit 4f7efd41740107f90960116700e3134f5e433867)
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(cherry picked from commit 13c16b756900fe524f6d9534e8a07aa003c05e0c)
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(cherry picked from commit 1d4788a39668fb2dc5912a8d9c4272dc40e99f92)
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(cherry picked from commit 87de75b5cc946d196decaa6aef4792a6cac0b6db)
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---
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diff --git a/src/network/access/http2/hpacktable.cpp b/src/network/access/http2/hpacktable.cpp
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index 834214f..ab166a6 100644
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--- a/src/network/access/http2/hpacktable.cpp
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+++ b/src/network/access/http2/hpacktable.cpp
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@@ -63,7 +63,7 @@
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// 32 octets of overhead."
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const unsigned sum = unsigned(name.size() + value.size());
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- if (std::numeric_limits<unsigned>::max() - 32 < sum)
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+ if (sum > (std::numeric_limits<unsigned>::max() - 32))
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return HeaderSize();
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return HeaderSize(true, quint32(sum + 32));
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}
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@ -0,0 +1,59 @@
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From 23c3fc483e8b6e21012a61f0bea884446f727776 Mon Sep 17 00:00:00 2001
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From: Marc Mutz <marc.mutz@qt.io>
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Date: Tue, 12 Dec 2023 22:08:07 +0100
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Subject: [PATCH] HPack: fix incorrect integer overflow check
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This code never worked:
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For the comparison with max() - 32 to trigger, on 32-bit platforms (or
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Qt 5) signed interger overflow would have had to happen in the
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addition of the two sizes. The compiler can therefore remove the
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overflow check as dead code.
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On Qt 6 and 64-bit platforms, the signed integer addition would be
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very unlikely to overflow, but the following truncation to uint32
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would yield the correct result only in a narrow 32-value window just
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below UINT_MAX, if even that.
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Fix by using the proper tool, qAddOverflow.
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Manual conflict resolutions:
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- qAddOverflow doesn't exist in Qt 5, use private add_overflow
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predecessor API instead
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Change-Id: I7599f2e75ff7f488077b0c60b81022591005661c
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Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
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(cherry picked from commit ee5da1f2eaf8932aeca02ffea6e4c618585e29e3)
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Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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(cherry picked from commit debeb8878da2dc706ead04b6072ecbe7e5313860)
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Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Reviewed-by: Marc Mutz <marc.mutz@qt.io>
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(cherry picked from commit 811b9eef6d08d929af8708adbf2a5effb0eb62d7)
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(cherry picked from commit f931facd077ce945f1e42eaa3bead208822d3e00)
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(cherry picked from commit 9ef4ca5ecfed771dab890856130e93ef5ceabef5)
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Reviewed-by: MÃ¥rten Nordheim <marten.nordheim@qt.io>
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---
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diff --git a/src/network/access/http2/hpacktable.cpp b/src/network/access/http2/hpacktable.cpp
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index ab166a6..de91fc0 100644
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--- a/src/network/access/http2/hpacktable.cpp
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+++ b/src/network/access/http2/hpacktable.cpp
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@@ -40,6 +40,7 @@
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#include "hpacktable_p.h"
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#include <QtCore/qdebug.h>
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+#include <QtCore/private/qnumeric_p.h>
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#include <algorithm>
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#include <cstddef>
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@@ -62,7 +63,9 @@
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// for counting the number of references to the name and value would have
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// 32 octets of overhead."
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- const unsigned sum = unsigned(name.size() + value.size());
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+ size_t sum;
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+ if (add_overflow(size_t(name.size()), size_t(value.size()), &sum))
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+ return HeaderSize();
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if (sum > (std::numeric_limits<unsigned>::max() - 32))
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return HeaderSize();
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return HeaderSize(true, quint32(sum + 32));
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@ -0,0 +1,197 @@
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diff --git a/src/gui/util/qktxhandler.cpp b/src/gui/util/qktxhandler.cpp
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index 0d98e97453..6a79e55109 100644
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--- a/src/gui/util/qktxhandler.cpp
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+++ b/src/gui/util/qktxhandler.cpp
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@@ -73,7 +73,7 @@ struct KTXHeader {
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quint32 bytesOfKeyValueData;
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};
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-static const quint32 headerSize = sizeof(KTXHeader);
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+static constexpr quint32 qktxh_headerSize = sizeof(KTXHeader);
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// Currently unused, declared for future reference
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struct KTXKeyValuePairItem {
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@@ -103,11 +103,36 @@ struct KTXMipmapLevel {
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*/
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};
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-bool QKtxHandler::canRead(const QByteArray &suffix, const QByteArray &block)
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+static bool qAddOverflow(quint32 v1, quint32 v2, quint32 *r) {
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+ // unsigned additions are well-defined
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+ *r = v1 + v2;
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+ return v1 > quint32(v1 + v2);
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+}
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+
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+// Returns the nearest multiple of 4 greater than or equal to 'value'
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+static bool nearestMultipleOf4(quint32 value, quint32 *result)
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+{
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+ constexpr quint32 rounding = 4;
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+ *result = 0;
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+ if (qAddOverflow(value, rounding - 1, result))
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+ return true;
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+ *result &= ~(rounding - 1);
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+ return false;
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+}
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+
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+// Returns a slice with prechecked bounds
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+static QByteArray safeSlice(const QByteArray& array, quint32 start, quint32 length)
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{
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- Q_UNUSED(suffix)
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+ quint32 end = 0;
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+ if (qAddOverflow(start, length, &end) || end > quint32(array.length()))
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+ return {};
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+ return QByteArray(array.data() + start, length);
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+}
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- return (qstrncmp(block.constData(), ktxIdentifier, KTX_IDENTIFIER_LENGTH) == 0);
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+bool QKtxHandler::canRead(const QByteArray &suffix, const QByteArray &block)
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+{
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+ Q_UNUSED(suffix);
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+ return block.startsWith(QByteArray::fromRawData(ktxIdentifier, KTX_IDENTIFIER_LENGTH));
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}
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QTextureFileData QKtxHandler::read()
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@@ -115,42 +140,97 @@ QTextureFileData QKtxHandler::read()
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if (!device())
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return QTextureFileData();
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- QByteArray buf = device()->readAll();
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- const quint32 dataSize = quint32(buf.size());
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- if (dataSize < headerSize || !canRead(QByteArray(), buf)) {
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- qCDebug(lcQtGuiTextureIO, "Invalid KTX file %s", logName().constData());
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+ const QByteArray buf = device()->readAll();
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+ if (size_t(buf.size()) > std::numeric_limits<quint32>::max()) {
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+ qWarning(lcQtGuiTextureIO, "Too big KTX file %s", logName().constData());
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+ return QTextureFileData();
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+ }
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+
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+ if (!canRead(QByteArray(), buf)) {
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+ qWarning(lcQtGuiTextureIO, "Invalid KTX file %s", logName().constData());
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+ return QTextureFileData();
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+ }
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+
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+ if (buf.size() < qsizetype(qktxh_headerSize)) {
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+ qWarning(lcQtGuiTextureIO, "Invalid KTX header size in %s", logName().constData());
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return QTextureFileData();
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}
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- const KTXHeader *header = reinterpret_cast<const KTXHeader *>(buf.constData());
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- if (!checkHeader(*header)) {
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- qCDebug(lcQtGuiTextureIO, "Unsupported KTX file format in %s", logName().constData());
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+ KTXHeader header;
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+ memcpy(&header, buf.data(), qktxh_headerSize);
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+ if (!checkHeader(header)) {
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+ qWarning(lcQtGuiTextureIO, "Unsupported KTX file format in %s", logName().constData());
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return QTextureFileData();
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}
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QTextureFileData texData;
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texData.setData(buf);
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- texData.setSize(QSize(decode(header->pixelWidth), decode(header->pixelHeight)));
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- texData.setGLFormat(decode(header->glFormat));
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- texData.setGLInternalFormat(decode(header->glInternalFormat));
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- texData.setGLBaseInternalFormat(decode(header->glBaseInternalFormat));
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-
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- texData.setNumLevels(decode(header->numberOfMipmapLevels));
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- quint32 offset = headerSize + decode(header->bytesOfKeyValueData);
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- const int maxLevels = qMin(texData.numLevels(), 32); // Cap iterations in case of corrupt file.
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- for (int i = 0; i < maxLevels; i++) {
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- if (offset + sizeof(KTXMipmapLevel) > dataSize) // Corrupt file; avoid oob read
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- break;
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- const KTXMipmapLevel *level = reinterpret_cast<const KTXMipmapLevel *>(buf.constData() + offset);
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- quint32 levelLen = decode(level->imageSize);
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- texData.setDataOffset(offset + sizeof(KTXMipmapLevel::imageSize), i);
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- texData.setDataLength(levelLen, i);
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- offset += sizeof(KTXMipmapLevel::imageSize) + levelLen + (3 - ((levelLen + 3) % 4));
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+ texData.setSize(QSize(decode(header.pixelWidth), decode(header.pixelHeight)));
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+ texData.setGLFormat(decode(header.glFormat));
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+ texData.setGLInternalFormat(decode(header.glInternalFormat));
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+ texData.setGLBaseInternalFormat(decode(header.glBaseInternalFormat));
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+
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+ texData.setNumLevels(decode(header.numberOfMipmapLevels));
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+
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+ const quint32 bytesOfKeyValueData = decode(header.bytesOfKeyValueData);
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+ quint32 headerKeyValueSize;
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+ if (qAddOverflow(qktxh_headerSize, bytesOfKeyValueData, &headerKeyValueSize)) {
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+ qWarning(lcQtGuiTextureIO, "Overflow in size of key value data in header of KTX file %s",
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+ logName().constData());
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+ return QTextureFileData();
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+ }
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+
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+ if (headerKeyValueSize >= quint32(buf.size())) {
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+ qWarning(lcQtGuiTextureIO, "OOB request in KTX file %s", logName().constData());
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+ return QTextureFileData();
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+ }
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+
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+ // Technically, any number of levels is allowed but if the value is bigger than
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+ // what is possible in KTX V2 (and what makes sense) we return an error.
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+ // maxLevels = log2(max(width, height, depth))
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+ const int maxLevels = (sizeof(quint32) * 8)
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+ - qCountLeadingZeroBits(std::max(
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+ { header.pixelWidth, header.pixelHeight, header.pixelDepth }));
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+
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+ if (texData.numLevels() > maxLevels) {
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+ qWarning(lcQtGuiTextureIO, "Too many levels in KTX file %s", logName().constData());
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+ return QTextureFileData();
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+ }
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+
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+ quint32 offset = headerKeyValueSize;
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+ for (int level = 0; level < texData.numLevels(); level++) {
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+ const auto imageSizeSlice = safeSlice(buf, offset, sizeof(quint32));
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+ if (imageSizeSlice.isEmpty()) {
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+ qWarning(lcQtGuiTextureIO, "OOB request in KTX file %s", logName().constData());
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+ return QTextureFileData();
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+ }
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+
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+ const quint32 imageSize = decode(qFromUnaligned<quint32>(imageSizeSlice.data()));
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+ offset += sizeof(quint32); // overflow checked indirectly above
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+
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+ texData.setDataOffset(offset, level);
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+ texData.setDataLength(imageSize, level);
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+
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+ // Add image data and padding to offset
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+ quint32 padded = 0;
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+ if (nearestMultipleOf4(imageSize, &padded)) {
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+ qWarning(lcQtGuiTextureIO, "Overflow in KTX file %s", logName().constData());
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+ return QTextureFileData();
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+ }
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+
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+ quint32 offsetNext;
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+ if (qAddOverflow(offset, padded, &offsetNext)) {
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+ qWarning(lcQtGuiTextureIO, "OOB request in KTX file %s", logName().constData());
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+ return QTextureFileData();
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+ }
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+
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+ offset = offsetNext;
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}
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if (!texData.isValid()) {
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- qCDebug(lcQtGuiTextureIO, "Invalid values in header of KTX file %s", logName().constData());
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+ qWarning(lcQtGuiTextureIO, "Invalid values in header of KTX file %s",
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+ logName().constData());
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return QTextureFileData();
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}
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@@ -191,7 +271,7 @@ bool QKtxHandler::checkHeader(const KTXHeader &header)
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(decode(header.numberOfFaces) == 1));
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}
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-quint32 QKtxHandler::decode(quint32 val)
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+quint32 QKtxHandler::decode(quint32 val) const
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{
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return inverseEndian ? qbswap<quint32>(val) : val;
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}
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diff --git a/src/gui/util/qktxhandler_p.h b/src/gui/util/qktxhandler_p.h
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index f831e59d95..cdf1b2eaf8 100644
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--- a/src/gui/util/qktxhandler_p.h
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+++ b/src/gui/util/qktxhandler_p.h
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@@ -68,7 +68,7 @@ public:
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private:
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bool checkHeader(const KTXHeader &header);
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- quint32 decode(quint32 val);
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+ quint32 decode(quint32 val) const;
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bool inverseEndian = false;
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};
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Reference in new issue