x11vnc: Fix CVE-2020-29074

Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/meta-oe/recipes-graphics/x11vnc/files/CVE-2020-29074.patch b/meta-oe/recipes-graphics/x11vnc/files/CVE-2020-29074.patch
new file mode 100644
index 000000000..fbdb9123c
--- /dev/null
+++ b/meta-oe/recipes-graphics/x11vnc/files/CVE-2020-29074.patch
@@ -0,0 +1,27 @@
+CVE: CVE-2020-29074
+Upstream-Status: Backport [https://github.com/LibVNC/x11vnc/commit/69eeb9f7baa14ca03b16c9de821f9876def7a36a ]
+Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
+
+
+From 69eeb9f7baa14ca03b16c9de821f9876def7a36a Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Gu=C3=A9nal=20DAVALAN?= <guenal.davalan@uca.fr>
+Date: Wed, 18 Nov 2020 08:40:45 +0100
+Subject: [PATCH] scan: limit access to shared memory segments to current user
+
+---
+ src/scan.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/scan.c b/src/scan.c
+index 43e00d20..12994d52 100644
+--- a/src/scan.c
++++ b/src/scan.c
+@@ -320,7 +320,7 @@ static int shm_create(XShmSegmentInfo *shm, XImage **ximg_ptr, int w, int h,
+ 
+ #if HAVE_XSHM
+        shm->shmid = shmget(IPC_PRIVATE,
+-           xim->bytes_per_line * xim->height, IPC_CREAT | 0777);
++           xim->bytes_per_line * xim->height, IPC_CREAT | 0600);
+ 
+        if (shm->shmid == -1) {
+                rfbErr("shmget(%s) failed.\n", name);
diff --git a/meta-oe/recipes-graphics/x11vnc/x11vnc_0.9.16.bb b/meta-oe/recipes-graphics/x11vnc/x11vnc_0.9.16.bb
index 92b3ac5f6..3633bbc26 100644
--- a/meta-oe/recipes-graphics/x11vnc/x11vnc_0.9.16.bb
+++ b/meta-oe/recipes-graphics/x11vnc/x11vnc_0.9.16.bb
@@ -11,6 +11,7 @@ PV .= "+git${SRCPV}"
 
 SRC_URI = "git://github.com/LibVNC/x11vnc;branch=master;protocol=https \
            file://starting-fix.patch \
+           file://CVE-2020-29074.patch \
            "
 S = "${WORKDIR}/git"