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Fix out-of-bound write that may lead to DoS

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Resolves: bz#2038488
This commit is contained in:
Jan Grulich 2022-01-11 12:58:26 +01:00
parent d2981bdd53
commit d76cfc6292
2 changed files with 231 additions and 0 deletions
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7
qt5-qtsvg.spec
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@ -16,6 +16,9 @@ Source0: https://download.qt.io/official_releases/qt/%{majmin}/%{version}/submod
# upstream fix
Patch0: qtsvg-5.15.2-clamp-parsed-doubles-to-float-representtable-values.patch
# CVE-2021-45930 qt5-qtsvg: qt: out-of-bounds write may lead to DoS
Patch1: qtsvg-do-stricter-error-checking-when-parsing-path-nodes.patch
BuildRequires: make
BuildRequires: qt5-qtbase-devel >= %{version}
BuildRequires: pkgconfig(zlib)
@ -110,6 +113,10 @@ popd
%endif
%changelog
* Tue Jan 11 2022 Jan Grulich <jgrulich@redhat.com> - 5.15.2-8
- Fix out-of-bound write that may lead to DoS
Resolves: bz#2038488
* Tue Aug 10 2021 Mohan Boddu <mboddu@redhat.com> - 5.15.2-7
- Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
Related: rhbz#1991688

224
qtsvg-do-stricter-error-checking-when-parsing-path-nodes.patch Normal file
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@ -0,0 +1,224 @@
From 5b9285c34731e67f9f1d61ec804740991f2a0380 Mon Sep 17 00:00:00 2001
From: Eirik Aavitsland <eirik.aavitsland@qt.io>
Date: Mon, 25 Oct 2021 14:17:55 +0200
Subject: [PATCH] Do stricter error checking when parsing path nodes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The SVG spec mandates that path parsing should terminate on the first
error encountered, and an error be reported. To improve the handling
of corrupt files, implement such error handling, and also limit the
number of QPainterPath elements to a reasonable range.
Fixes: QTBUG-96044
Pick-to: 6.2 5.15 5.12
Change-Id: Ic5e65d6b658516d6f1317c72de365c8c7ad81891
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Robert Löhning <robert.loehning@qt.io>
(cherry picked from commit 36cfd9efb9b22b891adee9c48d30202289cfa620)
---
src/svg/qsvghandler.cpp | 59 +++++++++++++++++------------------------
1 file changed, 25 insertions(+), 34 deletions(-)
diff --git a/src/svg/qsvghandler.cpp b/src/svg/qsvghandler.cpp
index b542089..2ea80ed 100644
--- a/src/svg/qsvghandler.cpp
+++ b/src/svg/qsvghandler.cpp
@@ -1627,6 +1627,7 @@ static void pathArc(QPainterPath &path,
static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
{
+ const int maxElementCount = 0x7fff; // Assume file corruption if more path elements than this
qreal x0 = 0, y0 = 0; // starting point
qreal x = 0, y = 0; // current point
char lastMode = 0;
@@ -1634,7 +1635,8 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
const QChar *str = dataStr.constData();
const QChar *end = str + dataStr.size();
- while (str != end) {
+ bool ok = true;
+ while (ok && str != end) {
while (str->isSpace() && (str + 1) != end)
++str;
QChar pathElem = *str;
@@ -1651,14 +1653,13 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
arg.append(0);//dummy
const qreal *num = arg.constData();
int count = arg.count();
- while (count > 0) {
+ while (ok && count > 0) {
qreal offsetX = x; // correction offsets
qreal offsetY = y; // for relative commands
switch (pathElem.unicode()) {
case 'm': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = x0 = num[0] + offsetX;
@@ -1675,8 +1676,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
break;
case 'M': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = x0 = num[0];
@@ -1702,8 +1702,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
break;
case 'l': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = num[0] + offsetX;
@@ -1716,8 +1715,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
break;
case 'L': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = num[0];
@@ -1757,8 +1755,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
break;
case 'c': {
if (count < 6) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1(num[0] + offsetX, num[1] + offsetY);
@@ -1774,8 +1771,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
case 'C': {
if (count < 6) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1(num[0], num[1]);
@@ -1791,8 +1787,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
case 's': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1;
@@ -1813,8 +1808,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
case 'S': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1;
@@ -1835,8 +1829,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
case 'q': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c(num[0] + offsetX, num[1] + offsetY);
@@ -1851,8 +1844,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
case 'Q': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c(num[0], num[1]);
@@ -1867,8 +1859,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
case 't': {
if (count < 2) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF e(num[0] + offsetX, num[1] + offsetY);
@@ -1888,8 +1879,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
case 'T': {
if (count < 2) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF e(num[0], num[1]);
@@ -1909,8 +1899,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
case 'a': {
if (count < 7) {
- num += count;
- count = 0;
+ ok = false;
break;
}
qreal rx = (*num++);
@@ -1932,8 +1921,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
break;
case 'A': {
if (count < 7) {
- num += count;
- count = 0;
+ ok = false;
break;
}
qreal rx = (*num++);
@@ -1954,12 +1942,15 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
}
break;
default:
- return false;
+ ok = false;
+ break;
}
lastMode = pathElem.toLatin1();
+ if (path.elementCount() > maxElementCount)
+ ok = false;
}
}
- return true;
+ return ok;
}
static bool parseStyle(QSvgNode *node,
@@ -2997,8 +2988,8 @@ static QSvgNode *createPathNode(QSvgNode *parent,
QPainterPath qpath;
qpath.setFillRule(Qt::WindingFill);
- //XXX do error handling
- parsePathDataFast(data, qpath);
+ if (!parsePathDataFast(data, qpath))
+ qCWarning(lcSvgHandler, "Invalid path data; path truncated.");
QSvgNode *path = new QSvgPath(parent, qpath);
return path;
--
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