[hardknott][PATCH 2/4] xserver-xorg: fix CVE-2021-4009

[<kai.kang@windriver.com>]

From: Kai Kang <kai.kang@windriver.com>

Backport patch to fix CVE-2021-4009 for xserver-xorg.

CVE: CVE-2021-4009

Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
 .../xserver-xorg/CVE-2021-4009.patch          | 50 +++++++++++++++++++
 .../xorg-xserver/xserver-xorg_1.20.10.bb      |  1 +
 2 files changed, 51 insertions(+)
 create mode 100644 meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2021-4009.patch

diff --git a/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2021-4009.patch b/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2021-4009.patch
new file mode 100644
index 0000000000..ddfbb43ee4
--- /dev/null
+++ b/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2021-4009.patch
@@ -0,0 +1,50 @@
+Backport patch to fix CVE-2021-4009.
+
+CVE: CVE-2021-4009
+Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/b519675]
+
+Signed-off-by: Kai Kang <kai.kang@windriver.com>
+
+From b5196750099ae6ae582e1f46bd0a6dad29550e02 Mon Sep 17 00:00:00 2001
+From: Povilas Kanapickas <povilas@radix.lt>
+Date: Tue, 14 Dec 2021 15:00:01 +0200
+Subject: [PATCH] xfixes: Fix out of bounds access in
+ *ProcXFixesCreatePointerBarrier()
+
+ZDI-CAN-14950, CVE-2021-4009
+
+This vulnerability was discovered and the fix was suggested by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
+---
+ xfixes/cursor.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/xfixes/cursor.c b/xfixes/cursor.c
+index 60580b88f..c5d4554b2 100644
+--- a/xfixes/cursor.c
++++ b/xfixes/cursor.c
+@@ -1010,7 +1010,8 @@ ProcXFixesCreatePointerBarrier(ClientPtr client)
+ {
+     REQUEST(xXFixesCreatePointerBarrierReq);
+ 
+-    REQUEST_FIXED_SIZE(xXFixesCreatePointerBarrierReq, pad_to_int32(stuff->num_devices));
++    REQUEST_FIXED_SIZE(xXFixesCreatePointerBarrierReq,
++                       pad_to_int32(stuff->num_devices * sizeof(CARD16)));
+     LEGAL_NEW_RESOURCE(stuff->barrier, client);
+ 
+     return XICreatePointerBarrier(client, stuff);
+@@ -1027,7 +1028,8 @@ SProcXFixesCreatePointerBarrier(ClientPtr client)
+ 
+     swaps(&stuff->length);
+     swaps(&stuff->num_devices);
+-    REQUEST_FIXED_SIZE(xXFixesCreatePointerBarrierReq, pad_to_int32(stuff->num_devices));
++    REQUEST_FIXED_SIZE(xXFixesCreatePointerBarrierReq,
++                       pad_to_int32(stuff->num_devices * sizeof(CARD16)));
+ 
+     swapl(&stuff->barrier);
+     swapl(&stuff->window);
+-- 
+GitLab
+
diff --git a/meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.10.bb b/meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.10.bb
index 9a7aa1ed9a..ac32bb25c2 100644
--- a/meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.10.bb
+++ b/meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.10.bb
@@ -10,6 +10,7 @@ SRC_URI += "file://0001-xf86pciBus.c-use-Intel-ddx-only-for-pre-gen4-hardwar.pat
            file://CVE-2021-3472.patch \
            file://0001-hw-xwayland-Makefile.am-fix-build-without-glx.patch \
            file://CVE-2021-4008.patch \
+           file://CVE-2021-4009.patch \
            "
 SRC_URI[sha256sum] = "977420c082450dc808de301ef56af4856d653eea71519a973c3490a780cb7c99"
 
-- 
2.17.1