From 78b38a8a37e6105360c82a710ef62c92643ea4c1 Mon Sep 17 00:00:00 2001
From: Julien Cristau <jcristau@debian.org>
Date: Mon, 10 Nov 2014 12:13:41 -0500
Subject: [PATCH 35/40] glx: Length checking for GLXRender requests (v2)
[CVE-2014-8098 2/8] (v3)
v2:
Remove can't-happen comparison for cmdlen < 0 (Michal Srb)
v3: backport to RHEL5 hit old paths
v4: backport to nx-libs 3.6.x (Mike DePaulo)
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Michal Srb <msrb@suse.com>
Reviewed-by: Andy Ritger <aritger@nvidia.com>
Signed-off-by: Julien Cristau <jcristau@debian.org>
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/glxcmds.c | 20 ++++++++++----------
nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c | 20 ++++++++++----------
2 files changed, 20 insertions(+), 20 deletions(-)
--- a/nx-X11/programs/Xserver/GL/glx/glxcmds.c
+++ b/nx-X11/programs/Xserver/GL/glx/glxcmds.c
@@ -1443,7 +1443,7 @@ int __glXRender(__GLXclientState *cl, GL
left = (req->length << 2) - sz_xGLXRenderReq;
while (left > 0) {
__GLXrenderSizeData *entry;
- int extra;
+ int extra = 0;
void (* proc)(GLbyte *);
/*
@@ -1454,6 +1454,9 @@ int __glXRender(__GLXclientState *cl, GL
cmdlen = hdr->length;
opcode = hdr->opcode;
+ if (left < cmdlen)
+ return BadLength;
+
/*
** Check for core opcodes and grab entry data.
*/
@@ -1480,22 +1483,19 @@ int __glXRender(__GLXclientState *cl, GL
client->errorValue = commandsDone;
return __glXBadRenderRequest;
}
+
+ if (cmdlen < entry->bytes) {
+ return BadLength;
+ }
+
if (entry->varsize) {
/* variable size command */
extra = (*entry->varsize)(pc + __GLX_RENDER_HDR_SIZE, False);
if (extra < 0) {
return BadLength;
}
- if (cmdlen != __GLX_PAD(entry->bytes + extra)) {
- return BadLength;
- }
- } else {
- /* constant size command */
- if (cmdlen != __GLX_PAD(entry->bytes)) {
- return BadLength;
- }
}
- if (left < cmdlen) {
+ if (cmdlen != safe_pad(safe_add(entry->bytes, extra))) {
return BadLength;
}
--- a/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
+++ b/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
@@ -498,7 +498,7 @@ int __glXSwapRender(__GLXclientState *cl
left = (req->length << 2) - sz_xGLXRenderReq;
while (left > 0) {
__GLXrenderSizeData *entry;
- int extra;
+ int extra = 0;
void (* proc)(GLbyte *);
/*
@@ -511,6 +511,9 @@ int __glXSwapRender(__GLXclientState *cl
cmdlen = hdr->length;
opcode = hdr->opcode;
+ if (left < cmdlen)
+ return BadLength;
+
if ( (opcode >= __GLX_MIN_RENDER_OPCODE) &&
(opcode <= __GLX_MAX_RENDER_OPCODE) ) {
entry = &__glXRenderSizeTable[opcode];
@@ -531,22 +534,19 @@ int __glXSwapRender(__GLXclientState *cl
client->errorValue = commandsDone;
return __glXBadRenderRequest;
}
+
+ if (cmdlen < entry->bytes) {
+ return BadLength;
+ }
+
if (entry->varsize) {
/* variable size command */
extra = (*entry->varsize)(pc + __GLX_RENDER_HDR_SIZE, True);
if (extra < 0) {
return BadLength;
}
- if (cmdlen != __GLX_PAD(entry->bytes + extra)) {
- return BadLength;
- }
- } else {
- /* constant size command */
- if (cmdlen != __GLX_PAD(entry->bytes)) {
- return BadLength;
- }
}
- if (left < cmdlen) {
+ if (cmdlen != safe_pad(safe_add(entry->bytes, extra))) {
return BadLength;
}