This file is indexed.

/etc/selinux/mls/contexts/x_contexts is in selinux-policy-mls 2:2.20140421-9.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# Config file for XSELinux extension
#


#
##
### Rules for X Clients
##
#

#
# The default client rule defines a context to be used for all clients
# connecting to the server from a remote host.
#
client	*				system_u:object_r:remote_t:s0


#
##
### Rules for X Properties
##
#

#
# Property rules map a property name to a context.  A default property
# rule indicated by an asterisk should follow all other property rules.
#
# Properties that normal clients may only read
property _SELINUX_*			system_u:object_r:seclabel_xproperty_t:s0

# Clipboard and selection properties
property CUT_BUFFER?			system_u:object_r:clipboard_xproperty_t:s0

# Default fallback type
property *	   			system_u:object_r:xproperty_t:s0


#
##
### Rules for X Extensions
##
#

#
# Extension rules map an extension name to a context.  A default extension
# rule indicated by an asterisk should follow all other extension rules.
#
# Restricted extensions
extension SELinux			system_u:object_r:security_xextension_t:s0

# Standard extensions
extension *	   			system_u:object_r:xextension_t:s0


#
##
### Rules for X Selections
##
#

# Selection rules map a selection name to a context.  A default selection
# rule indicated by an asterisk should follow all other selection rules.
#
# Standard selections
selection PRIMARY			system_u:object_r:clipboard_xselection_t:s0
selection CLIPBOARD			system_u:object_r:clipboard_xselection_t:s0

# Default fallback type
selection *				system_u:object_r:xselection_t:s0


#
##
### Rules for X Events
##
#

#
# Event rules map an event protocol name to a context.  A default event
# rule indicated by an asterisk should follow all other event rules.
#
# Input events
event X11:KeyPress			system_u:object_r:input_xevent_t:s0
event X11:KeyRelease			system_u:object_r:input_xevent_t:s0
event X11:ButtonPress			system_u:object_r:input_xevent_t:s0
event X11:ButtonRelease			system_u:object_r:input_xevent_t:s0
event X11:MotionNotify			system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceKeyPress	system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceKeyRelease	system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceButtonPress	system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceButtonRelease	system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceMotionNotify	system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceValuator	system_u:object_r:input_xevent_t:s0
event XInputExtension:ProximityIn	system_u:object_r:input_xevent_t:s0
event XInputExtension:ProximityOut	system_u:object_r:input_xevent_t:s0

# Client message events
event X11:ClientMessage			system_u:object_r:client_xevent_t:s0
event X11:SelectionNotify		system_u:object_r:client_xevent_t:s0
event X11:UnmapNotify			system_u:object_r:client_xevent_t:s0
event X11:ConfigureNotify		system_u:object_r:client_xevent_t:s0

# Default fallback type
event *					system_u:object_r:xevent_t:s0