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authorAdam Jackson <ajax@redhat.com>2014-11-10 12:13:36 -0500
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2015-02-14 16:14:32 +0100
commit5c43bb2484414b37115dac56dc76f1ecf4c05837 (patch)
tree4009cbea4fc311b17d4a965f5e5019600e77989e /nx-X11/programs
parentcea44678dd6a9418460ead314fb2106924b081f7 (diff)
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glx: Be more paranoid about variable-length requests [CVE-2014-8093 1/6] (v2)
If the size computation routine returns -1 we should just reject the request outright. Clamping it to zero could give an attacker the opportunity to also mangle cmdlen in such a way that the subsequent length check passes, and the request would get executed, thus passing data we wanted to reject to the renderer. v3: backport to nx-libs 3.6.x (Mike DePaulo) v2: backport to RHEL5 - fix swap paths 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> fixup swaps
Diffstat (limited to 'nx-X11/programs')
-rw-r--r--nx-X11/programs/Xserver/GL/glx/glxcmds.c4
-rw-r--r--nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/nx-X11/programs/Xserver/GL/glx/glxcmds.c b/nx-X11/programs/Xserver/GL/glx/glxcmds.c
index ca5eee82a..02f3ba7f2 100644
--- a/nx-X11/programs/Xserver/GL/glx/glxcmds.c
+++ b/nx-X11/programs/Xserver/GL/glx/glxcmds.c
@@ -1484,7 +1484,7 @@ int __glXRender(__GLXclientState *cl, GLbyte *pc)
/* variable size command */
extra = (*entry->varsize)(pc + __GLX_RENDER_HDR_SIZE, False);
if (extra < 0) {
- extra = 0;
+ return BadLength;
}
if (cmdlen != __GLX_PAD(entry->bytes + extra)) {
return BadLength;
@@ -1601,7 +1601,7 @@ int __glXRenderLarge(__GLXclientState *cl, GLbyte *pc)
*/
extra = (*entry->varsize)(pc + __GLX_RENDER_LARGE_HDR_SIZE, False);
if (extra < 0) {
- extra = 0;
+ return BadLength;
}
/* large command's header is 4 bytes longer, so add 4 */
if (cmdlen != __GLX_PAD(entry->bytes + 4 + extra)) {
diff --git a/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c b/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
index 595e814e5..027cba709 100644
--- a/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
+++ b/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
@@ -535,7 +535,7 @@ int __glXSwapRender(__GLXclientState *cl, GLbyte *pc)
/* variable size command */
extra = (*entry->varsize)(pc + __GLX_RENDER_HDR_SIZE, True);
if (extra < 0) {
- extra = 0;
+ return BadLength;
}
if (cmdlen != __GLX_PAD(entry->bytes + extra)) {
return BadLength;
@@ -659,7 +659,7 @@ int __glXSwapRenderLarge(__GLXclientState *cl, GLbyte *pc)
*/
extra = (*entry->varsize)(pc + __GLX_RENDER_LARGE_HDR_SIZE, True);
if (extra < 0) {
- extra = 0;
+ return BadLength;
}
/* large command's header is 4 bytes longer, so add 4 */
if (cmdlen != __GLX_PAD(entry->bytes + 4 + extra)) {