package/x11r7/xserver_xorg-server: add security fix for CVE-2020-14347

Release notes:
https://lists.x.org/archives/xorg-announce/2020-July/003051.html

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Thomas: add IGNORE_CVES entry.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 8a46f3237a5f3c7cc59130b05b9afd4290a047fb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/x11r7/xserver_xorg-server/1.20.8/0007-fix-for-ZDI-11426.patch

@@ -0,0 +1,36 @@
+From aac28e162e5108510065ad4c323affd6deffd816 Mon Sep 17 00:00:00 2001
+From: Matthieu Herrb <matthieu@herrb.eu>
+Date: Sat, 25 Jul 2020 19:33:50 +0200
+Subject: [PATCH] fix for ZDI-11426
+
+Avoid leaking un-initalized memory to clients by zeroing the
+whole pixmap on initial allocation.
+
+This vulnerability was discovered by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
+Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
+[downloaded from upstream commit
+ https://gitlab.freedesktop.org/xorg/xserver/-/commit/aac28e162e5108510065ad4c323affd6deffd816]
+---
+ dix/pixmap.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/dix/pixmap.c b/dix/pixmap.c
+index 1186d7dbbf..5a0146bbb6 100644
+--- a/dix/pixmap.c
++++ b/dix/pixmap.c
+@@ -116,7 +116,7 @@ AllocatePixmap(ScreenPtr pScreen, int pixDataSize)
+     if (pScreen->totalPixmapSize > ((size_t) - 1) - pixDataSize)
+         return NullPixmap;
+ 
+-    pPixmap = malloc(pScreen->totalPixmapSize + pixDataSize);
++    pPixmap = calloc(1, pScreen->totalPixmapSize + pixDataSize);
+     if (!pPixmap)
+         return NullPixmap;
+ 
+-- 
+GitLab
+

package/x11r7/xserver_xorg-server/xserver_xorg-server.mk

@@ -38,6 +38,11 @@ XSERVER_XORG_SERVER_DEPENDENCIES = \
 	mcookie \
 	host-pkgconf
 
+ifeq ($(BR2_PACKAGE_XSERVER_XORG_SERVER_V_1_20),y)
+# 1.20.8/0007-fix-for-ZDI-11426.patch
+XSERVER_XORG_SERVER_IGNORE_CVES += CVE-2020-14347
+endif
+
 # We force -O2 regardless of the optimization level chosen by the
 # user, as the X.org server is known to trigger some compiler bugs at
 # -Os on several architectures.