[xorg-x11-server] CVE-2013-1940: Fix xf86FlushInput() to drain evdev events

[Peter Hutterer]

commit b3223c2c2818e4e1ef49a13be57063c981cf3203
Author: Peter Hutterer <peter.hutterer at who-t.net>
Date:   Thu Apr 11 08:11:37 2013 +1000

    CVE-2013-1940: Fix xf86FlushInput() to drain evdev events
    
    (#950438, #952949)

 ...ush-input-to-work-with-Linux-evdev-device.patch |   38 ++++++++++++++++++++
 xorg-x11-server.spec                               |   11 +++++-
 2 files changed, 48 insertions(+), 1 deletions(-)
---
diff --git a/0001-xf86-fix-flush-input-to-work-with-Linux-evdev-device.patch b/0001-xf86-fix-flush-input-to-work-with-Linux-evdev-device.patch
new file mode 100644
index 0000000..8d37032
--- /dev/null
+++ b/0001-xf86-fix-flush-input-to-work-with-Linux-evdev-device.patch
@@ -0,0 +1,38 @@
+From 8647ee8f422e1ea9212d84ae14ef2163793bcdc8 Mon Sep 17 00:00:00 2001
+From: Dave Airlie <airlied at gmail.com>
+Date: Wed, 10 Apr 2013 16:09:01 +1000
+Subject: [PATCH] xf86: fix flush input to work with Linux evdev devices.
+
+So when we VT switch back and attempt to flush the input devices,
+we don't succeed because evdev won't return part of an event,
+since we were only asking for 4 bytes, we'd only get -EINVAL back.
+
+This could later cause events to be flushed that we shouldn't have
+gotten.
+
+This is a fix for CVE-2013-1940.
+
+Signed-off-by: Dave Airlie <airlied at redhat.com>
+Reviewed-by: Peter Hutterer <peter.hutterer at who-t.net>
+Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
+---
+ hw/xfree86/os-support/shared/posix_tty.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/hw/xfree86/os-support/shared/posix_tty.c b/hw/xfree86/os-support/shared/posix_tty.c
+index ab3757a..4d08c1e 100644
+--- a/hw/xfree86/os-support/shared/posix_tty.c
++++ b/hw/xfree86/os-support/shared/posix_tty.c
+@@ -421,7 +421,8 @@ xf86FlushInput(int fd)
+ {
+     fd_set fds;
+     struct timeval timeout;
+-    char c[4];
++    /* this needs to be big enough to flush an evdev event. */
++    char c[256];
+ 
+     DebugF("FlushingSerial\n");
+     if (tcflush(fd, TCIFLUSH) == 0)
+-- 
+1.8.1.4
+
diff --git a/xorg-x11-server.spec b/xorg-x11-server.spec
index 0b2c2ed..d5087ec 100644
--- a/xorg-x11-server.spec
+++ b/xorg-x11-server.spec
@@ -42,7 +42,7 @@
 Summary:   X.Org X11 X server
 Name:      xorg-x11-server
 Version:   1.14.0
-Release:   3%{?gitdate:.%{gitdate}}%{dist}
+Release:   4%{?gitdate:.%{gitdate}}%{dist}
 URL:       http://www.x.org
 License:   MIT
 Group:     User Interface/X
@@ -118,6 +118,11 @@ Patch7070: 0001-randr-report-changes-when-we-disconnect-a-GPU-slave.patch
 Patch7071: 0001-os-use-libunwind-to-generate-backtraces.patch
 %endif
 
+# Bug 950438 - CVE-2013-1940 xorg-x11-server:
+# Information disclosure due enabling events from hot-plug devices despite
+# input from the device being momentarily disabled
+Patch7072: 0001-xf86-fix-flush-input-to-work-with-Linux-evdev-device.patch
+
 %global moduledir	%{_libdir}/xorg/modules
 %global drimoduledir	%{_libdir}/dri
 %global sdkdir		%{_includedir}/xorg
@@ -590,6 +595,10 @@ rm -rf $RPM_BUILD_ROOT
 %{xserver_source_dir}
 
 %changelog
+* Wed Apr 17 2013 Peter Hutterer <peter.hutterer at redhat.com> 1.14.0-4
+- CVE-2013-1940: Fix xf86FlushInput() to drain evdev events
+  (#950438, #952949)
+
 * Fri Mar 22 2013 Dan Horák <dan at danny.cz> 1.14.0-3
 - libunwind exists only on selected arches