From 8931066077a04999d973932e04da577bd6906c82 Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Mon, 10 Nov 2014 12:13:47 -0500
Subject: [PATCH 38/40] glx: Length checking for non-generated single requests
 (v2) [CVE-2014-8098 7/8]

v2:
Fix single versus vendor-private length checking for ARB_imaging subset
extensions. (Julien Cristau)

v3:
Fix single versus vendor-private length checking for ARB_imaging subset
extensions. (Julien Cristau)

v4: backport to nx-libs 3.6.x (Mike DePaulo)

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: 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>

fix safe_Add
---
 nx-X11/programs/Xserver/GL/glx/single2.c       | 21 +++++++++++++++------
 nx-X11/programs/Xserver/GL/glx/single2swap.c   | 15 +++++++++++----
 nx-X11/programs/Xserver/GL/glx/singlepix.c     | 19 ++++++++++++++-----
 nx-X11/programs/Xserver/GL/glx/singlepixswap.c | 17 ++++++++++++-----
 4 files changed, 52 insertions(+), 20 deletions(-)

diff --git a/nx-X11/programs/Xserver/GL/glx/single2.c b/nx-X11/programs/Xserver/GL/glx/single2.c
index 9fee5ff..10152c3 100644
--- a/nx-X11/programs/Xserver/GL/glx/single2.c
+++ b/nx-X11/programs/Xserver/GL/glx/single2.c
@@ -48,11 +48,14 @@
 
 int __glXDisp_FeedbackBuffer(__GLXclientState *cl, GLbyte *pc)
 {
+    ClientPtr client = cl->client;
     GLsizei size;
     GLenum type;
     __GLXcontext *cx;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 8);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -78,10 +81,12 @@ int __glXDisp_FeedbackBuffer(__GLXclientState *cl, GLbyte *pc)
 
 int __glXDisp_SelectBuffer(__GLXclientState *cl, GLbyte *pc)
 {
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
     GLsizei size;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -106,7 +111,7 @@ int __glXDisp_SelectBuffer(__GLXclientState *cl, GLbyte *pc)
 
 int __glXDisp_RenderMode(__GLXclientState *cl, GLbyte *pc)
 {
-    ClientPtr client;
+    ClientPtr client = cl->client;
     xGLXRenderModeReply reply;
     __GLXcontext *cx;
     GLint nitems=0, retBytes=0, retval, newModeCheck;
@@ -114,6 +119,8 @@ int __glXDisp_RenderMode(__GLXclientState *cl, GLbyte *pc)
     GLenum newMode;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -188,7 +195,6 @@ int __glXDisp_RenderMode(__GLXclientState *cl, GLbyte *pc)
     ** selection array, as per the API for glRenderMode itself.
     */
   noChangeAllowed:;
-    client = cl->client;
     reply.length = nitems;
     reply.type = X_Reply;
     reply.sequenceNumber = client->sequence;
@@ -204,9 +210,11 @@ int __glXDisp_RenderMode(__GLXclientState *cl, GLbyte *pc)
 
 int __glXDisp_Flush(__GLXclientState *cl, GLbyte *pc)
 {
+        ClientPtr client = cl->client;
 	__GLXcontext *cx;
 	int error;
 
+	REQUEST_SIZE_MATCH(xGLXSingleReq);
 	cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
 	if (!cx) {
 		return error;
@@ -219,10 +227,11 @@ int __glXDisp_Flush(__GLXclientState *cl, GLbyte *pc)
 
 int __glXDisp_Finish(__GLXclientState *cl, GLbyte *pc)
 {
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
-    ClientPtr client;
     int error;
 
+    REQUEST_SIZE_MATCH(xGLXSingleReq);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -233,7 +242,6 @@ int __glXDisp_Finish(__GLXclientState *cl, GLbyte *pc)
     __GLX_NOTE_FLUSHED_CMDS(cx);
 
     /* Send empty reply packet to indicate finish is finished */
-    client = cl->client;
     __GLX_BEGIN_REPLY(0);
     __GLX_SEND_HEADER();
     return Success;
@@ -302,7 +310,7 @@ char *__glXcombine_strings(const char *cext_string, const char *sext_string)
 
 int DoGetString(__GLXclientState *cl, GLbyte *pc, GLboolean need_swap)
 {
-    ClientPtr client;
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
     GLenum name;
     const char *string;
@@ -311,6 +319,8 @@ int DoGetString(__GLXclientState *cl, GLbyte *pc, GLboolean need_swap)
     char *buf = NULL, *buf1 = NULL;
     GLint length = 0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
+
     /* If the client has the opposite byte order, swap the contextTag and
      * the name.
      */
@@ -327,7 +337,6 @@ int DoGetString(__GLXclientState *cl, GLbyte *pc, GLboolean need_swap)
     pc += __GLX_SINGLE_HDR_SIZE;
     name = *(GLenum *)(pc + 0);
     string = (const char *)glGetString(name);
-    client = cl->client;
 
     /*
     ** Restrict extensions to those that are supported by both the
diff --git a/nx-X11/programs/Xserver/GL/glx/single2swap.c b/nx-X11/programs/Xserver/GL/glx/single2swap.c
index dab98ad..4b8541b 100644
--- a/nx-X11/programs/Xserver/GL/glx/single2swap.c
+++ b/nx-X11/programs/Xserver/GL/glx/single2swap.c
@@ -48,12 +48,14 @@
 
 int __glXDispSwap_FeedbackBuffer(__GLXclientState *cl, GLbyte *pc)
 {
+    ClientPtr client = cl->client;
     GLsizei size;
     GLenum type;
     __GLX_DECLARE_SWAP_VARIABLES;
     __GLXcontext *cx;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 8);
     __GLX_SWAP_INT(&((xGLXSingleReq *)pc)->contextTag);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
@@ -82,11 +84,13 @@ int __glXDispSwap_FeedbackBuffer(__GLXclientState *cl, GLbyte *pc)
 
 int __glXDispSwap_SelectBuffer(__GLXclientState *cl, GLbyte *pc)
 {
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
     GLsizei size;
     __GLX_DECLARE_SWAP_VARIABLES;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
     __GLX_SWAP_INT(&((xGLXSingleReq *)pc)->contextTag);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
@@ -113,7 +117,7 @@ int __glXDispSwap_SelectBuffer(__GLXclientState *cl, GLbyte *pc)
 
 int __glXDispSwap_RenderMode(__GLXclientState *cl, GLbyte *pc)
 {
-    ClientPtr client;
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
     xGLXRenderModeReply reply;
     GLint nitems=0, retBytes=0, retval, newModeCheck;
@@ -123,6 +127,8 @@ int __glXDispSwap_RenderMode(__GLXclientState *cl, GLbyte *pc)
     __GLX_DECLARE_SWAP_ARRAY_VARIABLES;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
+
     __GLX_SWAP_INT(&((xGLXSingleReq *)pc)->contextTag);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
@@ -201,7 +207,6 @@ int __glXDispSwap_RenderMode(__GLXclientState *cl, GLbyte *pc)
     ** selection array, as per the API for glRenderMode itself.
     */
   noChangeAllowed:;
-    client = cl->client;
     reply.length = nitems;
     reply.type = X_Reply;
     reply.sequenceNumber = client->sequence;
@@ -222,10 +227,12 @@ int __glXDispSwap_RenderMode(__GLXclientState *cl, GLbyte *pc)
 
 int __glXDispSwap_Flush(__GLXclientState *cl, GLbyte *pc)
 {
+    ClientPtr client = cl->client;
 	__GLXcontext *cx;
 	int error;
 	__GLX_DECLARE_SWAP_VARIABLES;
 
+	REQUEST_SIZE_MATCH(xGLXSingleReq);
 	__GLX_SWAP_INT(&((xGLXSingleReq *)pc)->contextTag);
 	cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
 	if (!cx) {
@@ -239,11 +246,12 @@ int __glXDispSwap_Flush(__GLXclientState *cl, GLbyte *pc)
 
 int __glXDispSwap_Finish(__GLXclientState *cl, GLbyte *pc)
 {
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
-    ClientPtr client;
     int error;
     __GLX_DECLARE_SWAP_VARIABLES;
 
+    REQUEST_SIZE_MATCH(xGLXSingleReq);
     __GLX_SWAP_INT(&((xGLXSingleReq *)pc)->contextTag);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
@@ -255,7 +263,6 @@ int __glXDispSwap_Finish(__GLXclientState *cl, GLbyte *pc)
     __GLX_NOTE_FLUSHED_CMDS(cx);
 
     /* Send empty reply packet to indicate finish is finished */
-    client = cl->client;
     __GLX_BEGIN_REPLY(0);
     __GLX_PUT_RETVAL(0);
     __GLX_SWAP_REPLY_HEADER();
diff --git a/nx-X11/programs/Xserver/GL/glx/singlepix.c b/nx-X11/programs/Xserver/GL/glx/singlepix.c
index be804d8..a156db5 100644
--- a/nx-X11/programs/Xserver/GL/glx/singlepix.c
+++ b/nx-X11/programs/Xserver/GL/glx/singlepix.c
@@ -57,6 +57,8 @@ int __glXDisp_ReadPixels(__GLXclientState *cl, GLbyte *pc)
     int error;
     char *answer, answerBuffer[200];
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 28);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -108,6 +110,7 @@ int __glXDisp_GetTexImage(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0, height=0, depth=1;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 20);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -204,6 +207,7 @@ int __glXDisp_GetSeparableFilter(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0, height=0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -227,13 +231,11 @@ int __glXDisp_GetSeparableFilter(__GLXclientState *cl, GLbyte *pc)
     compsize = __glGetTexImage_size(target,1,format,type,width,1,1);
     compsize2 = __glGetTexImage_size(target,1,format,type,height,1,1);
 
-    if (compsize < 0) return BadLength;
-    if (compsize2 < 0) compsize2 = 0;
-    compsize = __GLX_PAD(compsize);
-    compsize2 = __GLX_PAD(compsize2);
+    if ((compsize = safe_pad(compsize)) < 0) return BadLength;
+    if ((compsize2 = safe_pad(compsize2)) < 0) return BadLength;
 
     glPixelStorei(GL_PACK_SWAP_BYTES, swapBytes);
-    __GLX_GET_ANSWER_BUFFER(answer,cl,compsize + compsize2,1);
+    __GLX_GET_ANSWER_BUFFER(answer,cl,safe_add(compsize, compsize2),1);
     __glXClearErrorOccured();
     glGetSeparableFilter(
 		  *(GLenum   *)(pc + 0),
@@ -269,6 +271,7 @@ int __glXDisp_GetConvolutionFilter(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0, height=0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -328,6 +331,8 @@ int __glXDisp_GetHistogram(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -376,6 +381,8 @@ int __glXDisp_GetMinmax(__GLXclientState *cl, GLbyte *pc)
     int error;
     char *answer, answerBuffer[200];
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -419,6 +426,8 @@ int __glXDisp_GetColorTable(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
diff --git a/nx-X11/programs/Xserver/GL/glx/singlepixswap.c b/nx-X11/programs/Xserver/GL/glx/singlepixswap.c
index cdc6f16..24f2e76 100644
--- a/nx-X11/programs/Xserver/GL/glx/singlepixswap.c
+++ b/nx-X11/programs/Xserver/GL/glx/singlepixswap.c
@@ -58,6 +58,8 @@ int __glXDispSwap_ReadPixels(__GLXclientState *cl, GLbyte *pc)
     int error;
     char *answer, answerBuffer[200];
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 28);
+
     __GLX_SWAP_INT(&((xGLXSingleReq *)pc)->contextTag);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
@@ -120,6 +122,7 @@ int __glXDispSwap_GetTexImage(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0, height=0, depth=1;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 24);
     __GLX_SWAP_INT(&((xGLXSingleReq *)pc)->contextTag);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
@@ -190,6 +193,7 @@ int __glXDispSwap_GetPolygonStipple(__GLXclientState *cl, GLbyte *pc)
     char *answer;
     __GLX_DECLARE_SWAP_VARIABLES;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
     __GLX_SWAP_INT(&((xGLXSingleReq *)pc)->contextTag);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
@@ -230,6 +234,7 @@ int __glXDispSwap_GetSeparableFilter(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0, height=0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -257,13 +262,11 @@ int __glXDispSwap_GetSeparableFilter(__GLXclientState *cl, GLbyte *pc)
     compsize = __glGetTexImage_size(target,1,format,type,width,1,1);
     compsize2 = __glGetTexImage_size(target,1,format,type,height,1,1);
 
-    if (compsize < 0) return BadLength;
-    if (compsize2 < 0) compsize2 = 0;
-    compsize = __GLX_PAD(compsize);
-    compsize2 = __GLX_PAD(compsize2);
+    if ((compsize = safe_pad(compsize)) < 0) return BadLength;
+    if ((compsize2 = safe_pad(compsize2)) < 0) return BadLength;
 
     glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes);
-    __GLX_GET_ANSWER_BUFFER(answer,cl,compsize + compsize2,1);
+    __GLX_GET_ANSWER_BUFFER(answer,cl,safe_add(compsize, compsize2),1);
     __glXClearErrorOccured();
     glGetSeparableFilter(
 		  *(GLenum   *)(pc + 0),
@@ -302,6 +305,7 @@ int __glXDispSwap_GetConvolutionFilter(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0, height=0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -368,6 +372,7 @@ int __glXDispSwap_GetHistogram(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -422,6 +427,7 @@ int __glXDispSwap_GetMinmax(__GLXclientState *cl, GLbyte *pc)
     __GLX_DECLARE_SWAP_VARIABLES;
     char *answer, answerBuffer[200];
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
@@ -470,6 +476,7 @@ int __glXDispSwap_GetColorTable(__GLXclientState *cl, GLbyte *pc)
     char *answer, answerBuffer[200];
     GLint width=0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 16);
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
 	return error;
-- 
2.1.4

