xserver-xorg: Security Advisory - xserver-xorg - CVE-2020-14347

Backport patch from <https://gitlab.freedesktop.org/xorg/xserver/-/
commit/aac28e162e5108510065ad4c323affd6deffd816> to solve
CVE-2020-14347.

(From OE-Core rev: 850b454c090523f7f7503d4472fda77a4b2fc7a0)

Signed-off-by: Li Zhou <li.zhou@windriver.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2020-14347.patch

@@ -0,0 +1,37 @@
+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>
+
+Upstream-Status: Backport
+CVE: CVE-2020-14347
+Signed-off-by: Li Zhou <li.zhou@windriver.com>
+---
+ dix/pixmap.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/dix/pixmap.c b/dix/pixmap.c
+index 1186d7dbb..5a0146bbb 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;
+ 
+-- 
+2.17.1
+

meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.5.bb

@@ -5,6 +5,7 @@ SRC_URI += "file://0001-xf86pciBus.c-use-Intel-ddx-only-for-pre-gen4-hardwar.pat
             file://0001-test-xtest-Initialize-array-with-braces.patch \
             file://0001-compiler.h-Do-not-include-sys-io.h-on-ARM-with-glibc.patch \
             file://sdksyms-no-build-path.patch \
+            file://CVE-2020-14347.patch \
             "
 SRC_URI[md5sum] = "c9fc7e21e11286dbedd22c00df652130"
 SRC_URI[sha256sum] = "a81d8243f37e75a03d4f8c55f96d0bc25802be6ec45c3bfa5cb614c6d01bac9d"