From 8a59e3b7dbb30532a7c3769c555e00d7c4301170 Mon Sep 17 00:00:00 2001
From: Matthieu Herrb <matthieu@herrb.eu>
Date: Tue, 23 Oct 2018 21:29:08 +0200
Subject: [PATCH xserver] Disable -logfile and -modulepath when running with
 elevated privileges

Could cause privilege elevation and/or arbitrary files overwrite, when
the X server is running with elevated privileges (ie when Xorg is
installed with the setuid bit set and started by a non-root user).

CVE-2018-14665

Issue reported by Narendra Shinde and Red Hat.

Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Adam Jackson <ajax@redhat.com>
(cherry picked from commit 50c0cf885a6e91c0ea71fb49fa8f1b7c86fe330e)
---
 hw/xfree86/common/xf86Init.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/xfree86/common/xf86Init.c b/hw/xfree86/common/xf86Init.c
index 3c5cc7097c..cabf8716b6 100644
--- a/hw/xfree86/common/xf86Init.c
+++ b/hw/xfree86/common/xf86Init.c
@@ -1027,14 +1027,18 @@ ddxProcessArgument(int argc, char **argv, int i)
     /* First the options that are not allowed with elevated privileges */
     if (!strcmp(argv[i], "-modulepath")) {
         CHECK_FOR_REQUIRED_ARGUMENT();
-        xf86CheckPrivs(argv[i], argv[i + 1]);
+        if (xf86PrivsElevated())
+              FatalError("\nInvalid argument -modulepath "
+                "with elevated privileges\n");
         xf86ModulePath = argv[i + 1];
         xf86ModPathFrom = X_CMDLINE;
         return 2;
     }
     if (!strcmp(argv[i], "-logfile")) {
         CHECK_FOR_REQUIRED_ARGUMENT();
-        xf86CheckPrivs(argv[i], argv[i + 1]);
+        if (xf86PrivsElevated())
+              FatalError("\nInvalid argument -logfile "
+                "with elevated privileges\n");
         xf86LogFile = argv[i + 1];
         xf86LogFileFrom = X_CMDLINE;
         return 2;
-- 
2.19.1