Description of problem:
SELinux is preventing gdm-wayland-ses from 'read' accesses on the lnk_file /var/lib/dbus/machine-id.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that gdm-wayland-ses should be allowed read access on the machine-id lnk_file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'gdm-wayland-ses' --raw | audit2allow -M my-gdmwaylandses
# semodule -X 300 -i my-gdmwaylandses.pp

Additional Information:
Source Context                xguest_u:xguest_r:xguest_t:s0
Target Context                system_u:object_r:system_dbusd_var_lib_t:s0
Target Objects                /var/lib/dbus/machine-id [ lnk_file ]
Source                        gdm-wayland-ses
Source Path                   gdm-wayland-ses
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-260.1.fc26.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.11.10-300.fc26.x86_64 #1 SMP Wed
                              Jul 12 17:05:39 UTC 2017 x86_64 x86_64
Alert Count                   5
First Seen                    2017-07-25 18:38:10 AEST
Last Seen                     2017-07-25 18:39:23 AEST
Local ID                      6c81a7de-3bce-44e2-9a7f-88ca15cb37cd

Raw Audit Messages
type=AVC msg=audit(1500971963.379:1028): avc:  denied  { read } for  pid=1794 comm="gdm-wayland-ses" name="machine-id" dev="nvme0n1p1" ino=108 scontext=xguest_u:xguest_r:xguest_t:s0 tcontext=system_u:object_r:system_dbusd_var_lib_t:s0 tclass=lnk_file permissive=0


Hash: gdm-wayland-ses,xguest_t,system_dbusd_var_lib_t,lnk_file,read

Version-Release number of selected component:
selinux-policy-3.13.1-260.1.fc26.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.1
hashmarkername: setroubleshoot
kernel:         4.11.10-300.fc26.x86_64
type:           libreport