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From ddb1235bc621d06bf28309be70c173ae06131edf Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Mon, 10 Nov 2014 12:13:42 -0500
Subject: [PATCH 36/40] glx: Integer overflow protection for non-generated
render requests (v3) [CVE-2014-8093 5/6]
v2:
Fix constants in __glXMap2fReqSize (Michal Srb)
Validate w/h/d for proxy targets too (Keith Packard)
v3:
Fix Map[12]Size to correctly reject order == 0 (Julien Cristau)
v4: backport to nx-libs 3.6.x (Mike DePaulo)
Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Michal Srb <msrb@suse.com>
Reviewed-by: Andy Ritger <aritger@nvidia.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Fedora X Ninjas <x@fedoraproject.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---
nx-X11/programs/Xserver/GL/glx/rensize.c | 68 +++++++++++++++++---------------
1 file changed, 37 insertions(+), 31 deletions(-)
diff --git a/nx-X11/programs/Xserver/GL/glx/rensize.c b/nx-X11/programs/Xserver/GL/glx/rensize.c
index 7ab02d2..9bf0d00 100644
--- a/nx-X11/programs/Xserver/GL/glx/rensize.c
+++ b/nx-X11/programs/Xserver/GL/glx/rensize.c
@@ -167,16 +167,10 @@ int __glXTexEnvivReqSize(GLbyte *pc, Bool swap )
return __glXTexEnvfvReqSize( pc, swap );
}
-static int Map1Size( GLint k, GLint order)
-{
- if (order <= 0 || k < 0) return -1;
- return k * order;
-}
-
int __glXMap1dReqSize(GLbyte *pc, Bool swap )
{
GLenum target;
- GLint order, k;
+ GLint order;
target = *(GLenum*) (pc + 16);
order = *(GLint*) (pc + 20);
@@ -184,14 +178,15 @@ int __glXMap1dReqSize(GLbyte *pc, Bool swap )
target = SWAPL( target );
order = SWAPL( order );
}
- k = __glMap1d_size( target );
- return 8 * Map1Size( k, order );
+ if (order < 1)
+ return -1;
+ return safe_mul(8, safe_mul(__glMap1d_size(target), order));
}
int __glXMap1fReqSize(GLbyte *pc, Bool swap )
{
GLenum target;
- GLint order, k;
+ GLint order;
target = *(GLenum *)(pc + 0);
order = *(GLint *)(pc + 12);
@@ -199,20 +194,21 @@ int __glXMap1fReqSize(GLbyte *pc, Bool swap )
target = SWAPL( target );
order = SWAPL( order );
}
- k = __glMap1f_size(target);
- return 4 * Map1Size(k, order);
+ if (order < 1)
+ return -1;
+ return safe_mul(4, safe_mul(__glMap1f_size(target), order));
}
static int Map2Size(int k, int majorOrder, int minorOrder)
{
- if (majorOrder <= 0 || minorOrder <= 0 || k < 0) return -1;
- return k * majorOrder * minorOrder;
+ if (majorOrder < 1 || minorOrder < 1) return -1;
+ return safe_mul(k, safe_mul(majorOrder, minorOrder));
}
int __glXMap2dReqSize(GLbyte *pc, Bool swap )
{
GLenum target;
- GLint uorder, vorder, k;
+ GLint uorder, vorder;
target = *(GLenum *)(pc + 32);
uorder = *(GLint *)(pc + 36);
@@ -222,14 +218,13 @@ int __glXMap2dReqSize(GLbyte *pc, Bool swap )
uorder = SWAPL( uorder );
vorder = SWAPL( vorder );
}
- k = __glMap2d_size( target );
- return 8 * Map2Size( k, uorder, vorder );
+ return safe_mul(8, Map2Size(__glMap2d_size(target), uorder, vorder));
}
int __glXMap2fReqSize(GLbyte *pc, Bool swap )
{
GLenum target;
- GLint uorder, vorder, k;
+ GLint uorder, vorder;
target = *(GLenum *)(pc + 0);
uorder = *(GLint *)(pc + 12);
@@ -239,8 +234,7 @@ int __glXMap2fReqSize(GLbyte *pc, Bool swap )
uorder = SWAPL( uorder );
vorder = SWAPL( vorder );
}
- k = __glMap2f_size( target );
- return 4 * Map2Size( k, uorder, vorder );
+ return safe_mul(4, Map2Size(__glMap2f_size(target), uorder, vorder));
}
int __glXPixelMapfvReqSize(GLbyte *pc, Bool swap )
@@ -315,13 +309,16 @@ int __glXImageSize( GLenum format, GLenum type, GLenum target,
GLint bytesPerElement, elementsPerGroup, groupsPerRow;
GLint groupSize, rowSize, padding, imageSize;
+ if (w == 0 || h == 0 || d == 0)
+ return 0;
+
if (w < 0 || h < 0 || d < 0 ||
(type == GL_BITMAP &&
(format != GL_COLOR_INDEX && format != GL_STENCIL_INDEX))) {
return -1;
}
- if (w==0 || h==0 || d == 0) return 0;
+ /* proxy targets have no data */
switch( target ) {
case GL_PROXY_TEXTURE_1D:
case GL_PROXY_TEXTURE_2D:
@@ -338,6 +335,12 @@ int __glXImageSize( GLenum format, GLenum type, GLenum target,
return 0;
}
+ /* real data has to have real sizes */
+ if (imageHeight < 0 || rowLength < 0 || skipImages < 0 || skipRows < 0)
+ return -1;
+ if (alignment != 1 && alignment != 2 && alignment != 4 && alignment != 8)
+ return -1;
+
if (type == GL_BITMAP) {
if (rowLength > 0) {
groupsPerRow = rowLength;
@@ -345,11 +348,13 @@ int __glXImageSize( GLenum format, GLenum type, GLenum target,
groupsPerRow = w;
}
rowSize = (groupsPerRow + 7) >> 3;
+ if (rowSize < 0)
+ return -1;
padding = (rowSize % alignment);
if (padding) {
rowSize += alignment - padding;
}
- return ((h + skipRows) * rowSize);
+ return safe_mul(safe_add(h, skipRows), rowSize);
} else {
switch(format) {
case GL_COLOR_INDEX:
@@ -430,23 +435,25 @@ int __glXImageSize( GLenum format, GLenum type, GLenum target,
default:
return -1;
}
+ /* known safe by the switches above, not checked */
groupSize = bytesPerElement * elementsPerGroup;
if (rowLength > 0) {
groupsPerRow = rowLength;
} else {
groupsPerRow = w;
}
- rowSize = groupsPerRow * groupSize;
+ if ((rowSize = safe_mul(groupsPerRow, groupSize)) < 0)
+ return -1;
padding = (rowSize % alignment);
if (padding) {
rowSize += alignment - padding;
}
- if (imageHeight > 0) {
- imageSize = (imageHeight + skipRows) * rowSize;
- } else {
- imageSize = (h + skipRows) * rowSize;
- }
- return ((d + skipImages) * imageSize);
+ if (imageHeight > 0)
+ h = imageHeight;
+ h = safe_add(h, skipRows);
+
+ imageSize = safe_mul(h, rowSize);
+ return safe_mul(safe_add(d, skipImages), imageSize);
}
}
@@ -873,10 +880,9 @@ int __glXSeparableFilter2DReqSize(GLbyte *pc, Bool swap )
/* XXX Should rowLength be used for either or both image? */
image1size = __glXImageSize( format, type, 0, w, 1, 1,
0, rowLength, 0, 0, alignment );
- image1size = __GLX_PAD(image1size);
image2size = __glXImageSize( format, type, 0, h, 1, 1,
0, rowLength, 0, 0, alignment );
- return image1size + image2size;
+ return safe_add(safe_pad(image1size), image2size);
}
--
2.1.4
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