andreacavalli/xserver-multidpi
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

glx: Integer overflow protection for non-generated render requests (v3) [CVE-2014-8093 5/6]

Browse Source 
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)

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>
This commit is contained in:
Adam Jackson 2014-11-10 12:13:42 -05:00 committed by Alan Coopersmith
parent be09e0c988
commit 698888e667
1 changed files with 41 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
glx/rensize.c
View File

@ -43,19 +43,11 @@
(((a & 0xff000000U)>>24) | ((a & 0xff0000U)>>8) | \
((a & 0xff00U)<<8) | ((a & 0xffU)<<24))
static int
Map1Size(GLint k, GLint order)
{
if (order <= 0 || k < 0)
return -1;
return k * order;
}
int
__glXMap1dReqSize(const GLbyte * pc, Bool swap)
{
GLenum target;
GLint order, k;
GLint order;
target = *(GLenum *) (pc + 16);
order = *(GLint *) (pc + 20);
@ -63,15 +55,16 @@ __glXMap1dReqSize(const 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(const GLbyte * pc, Bool swap)
{
GLenum target;
GLint order, k;
GLint order;
target = *(GLenum *) (pc + 0);
order = *(GLint *) (pc + 12);
@ -79,23 +72,24 @@ __glXMap1fReqSize(const 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)
if (majorOrder < 1 || minorOrder < 1)
return -1;
return k * majorOrder * minorOrder;
return safe_mul(k, safe_mul(majorOrder, minorOrder));
}
int
__glXMap2dReqSize(const GLbyte * pc, Bool swap)
{
GLenum target;
GLint uorder, vorder, k;
GLint uorder, vorder;
target = *(GLenum *) (pc + 32);
uorder = *(GLint *) (pc + 36);
@ -105,15 +99,14 @@ __glXMap2dReqSize(const 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(const GLbyte * pc, Bool swap)
{
GLenum target;
GLint uorder, vorder, k;
GLint uorder, vorder;
target = *(GLenum *) (pc + 0);
uorder = *(GLint *) (pc + 12);
@ -123,8 +116,7 @@ __glXMap2fReqSize(const 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));
}
/**
@ -175,14 +167,16 @@ __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:
@ -199,6 +193,12 @@ __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;
@ -207,11 +207,14 @@ __glXImageSize(GLenum format, GLenum type, GLenum target,
groupsPerRow = w;
}
rowSize = bits_to_bytes(groupsPerRow);
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) {
@ -303,6 +306,7 @@ __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;
@ -310,18 +314,21 @@ __glXImageSize(GLenum format, GLenum type, GLenum target,
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);
}
}
@ -445,9 +452,7 @@ __glXSeparableFilter2DReqSize(const 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);
}