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CVE-2013-1940: Fix xf86FlushInput() to drain evdev events

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(#950438, #952949)
This commit is contained in:
Peter Hutterer 2013-04-11 08:11:37 +10:00
parent 528aae170f
commit b3223c2c28
2 changed files with 48 additions and 1 deletions
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38
0001-xf86-fix-flush-input-to-work-with-Linux-evdev-device.patch Normal file
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@ -0,0 +1,38 @@
From 8647ee8f422e1ea9212d84ae14ef2163793bcdc8 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@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@redhat.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@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

11
xorg-x11-server.spec
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@ -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@redhat.com> 1.14.0-4
- CVE-2013-1940: Fix xf86FlushInput() to drain evdev events
(#950438, #952949)
* Fri Mar 22 2013 Dan Horák <dan@danny.cz> 1.14.0-3
- libunwind exists only on selected arches