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From cdf0c3e65670c797a4fd0617d44d2bdff4011815 Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Mon, 10 Nov 2014 12:13:37 -0500
Subject: [PATCH 32/40] glx: Be more strict about rejecting invalid image sizes
[CVE-2014-8093 2/6]
Before this we'd just clamp the image size to 0, which was just
hideously stupid; if the parameters were such that they'd overflow an
integer, you'd allocate a small buffer, then pass huge values into (say)
ReadPixels, and now you're scribbling over arbitrary server memory.
v2: backport to nx-libs 3.6.x (Mike DePaulo)
Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Julien Cristau <jcristau@debian.org>
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/singlepix.c | 14 +++++++-------
nx-X11/programs/Xserver/GL/glx/singlepixswap.c | 14 +++++++-------
2 files changed, 14 insertions(+), 14 deletions(-)
--- a/nx-X11/programs/Xserver/GL/glx/singlepix.c
+++ b/nx-X11/programs/Xserver/GL/glx/singlepix.c
@@ -70,7 +70,7 @@ int __glXDisp_ReadPixels(__GLXclientStat
swapBytes = *(GLboolean *)(pc + 24);
lsbFirst = *(GLboolean *)(pc + 25);
compsize = __glReadPixels_size(format,type,width,height);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, swapBytes);
glPixelStorei(GL_PACK_LSB_FIRST, lsbFirst);
@@ -130,7 +130,7 @@ int __glXDisp_GetTexImage(__GLXclientSta
* are illegal, but then width, height, and depth would still be zero anyway.
*/
compsize = __glGetTexImage_size(target,level,format,type,width,height,depth);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
@@ -227,7 +227,7 @@ int __glXDisp_GetSeparableFilter(__GLXcl
compsize = __glGetTexImage_size(target,1,format,type,width,1,1);
compsize2 = __glGetTexImage_size(target,1,format,type,height,1,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
if (compsize2 < 0) compsize2 = 0;
compsize = __GLX_PAD(compsize);
compsize2 = __GLX_PAD(compsize2);
@@ -291,7 +291,7 @@ int __glXDisp_GetConvolutionFilter(__GLX
* are illegal, but then width and height would still be zero anyway.
*/
compsize = __glGetTexImage_size(target,1,format,type,width,height,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
@@ -346,7 +346,7 @@ int __glXDisp_GetHistogram(__GLXclientSt
* are illegal, but then width would still be zero anyway.
*/
compsize = __glGetTexImage_size(target,1,format,type,width,1,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
@@ -389,7 +389,7 @@ int __glXDisp_GetMinmax(__GLXclientState
reset = *(GLboolean *)(pc + 13);
compsize = __glGetTexImage_size(target,1,format,type,2,1,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
@@ -436,7 +436,7 @@ int __glXDisp_GetColorTable(__GLXclientS
* are illegal, but then width would still be zero anyway.
*/
compsize = __glGetTexImage_size(target,1,format,type,width,1,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
--- a/nx-X11/programs/Xserver/GL/glx/singlepixswap.c
+++ b/nx-X11/programs/Xserver/GL/glx/singlepixswap.c
@@ -79,7 +79,7 @@ int __glXDispSwap_ReadPixels(__GLXclient
swapBytes = *(GLboolean *)(pc + 24);
lsbFirst = *(GLboolean *)(pc + 25);
compsize = __glReadPixels_size(format,type,width,height);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes);
glPixelStorei(GL_PACK_LSB_FIRST, lsbFirst);
@@ -148,7 +148,7 @@ int __glXDispSwap_GetTexImage(__GLXclien
* are illegal, but then width, height, and depth would still be zero anyway.
*/
compsize = __glGetTexImage_size(target,level,format,type,width,height,depth);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
@@ -257,7 +257,7 @@ int __glXDispSwap_GetSeparableFilter(__G
compsize = __glGetTexImage_size(target,1,format,type,width,1,1);
compsize2 = __glGetTexImage_size(target,1,format,type,height,1,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
if (compsize2 < 0) compsize2 = 0;
compsize = __GLX_PAD(compsize);
compsize2 = __GLX_PAD(compsize2);
@@ -328,7 +328,7 @@ int __glXDispSwap_GetConvolutionFilter(_
* are illegal, but then width and height would still be zero anyway.
*/
compsize = __glGetTexImage_size(target,1,format,type,width,height,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
@@ -390,7 +390,7 @@ int __glXDispSwap_GetHistogram(__GLXclie
* are illegal, but then width would still be zero anyway.
*/
compsize = __glGetTexImage_size(target,1,format,type,width,1,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
@@ -439,7 +439,7 @@ int __glXDispSwap_GetMinmax(__GLXclientS
reset = *(GLboolean *)(pc + 13);
compsize = __glGetTexImage_size(target,1,format,type,2,1,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
@@ -491,7 +491,7 @@ int __glXDispSwap_GetColorTable(__GLXcli
* are illegal, but then width would still be zero anyway.
*/
compsize = __glGetTexImage_size(target,1,format,type,width,1,1);
- if (compsize < 0) compsize = 0;
+ if (compsize < 0) return BadLength;
glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes);
__GLX_GET_ANSWER_BUFFER(answer,cl,compsize,1);
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