Description of problem:
SELinux is preventing plymouthd from using the 'dac_override' capabilities.

*****  Plugin dac_override (91.4 confidence) suggests   **********************

If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system
Then attivare l'auditing completo per ottenere le informazioni del percorso del file incriminato e generare nuovamente l'errore.
Do

Attivare il controllo completo auditing
# auditctl -w /etc/shadow -p w
Provare a ricreare AVC. Eseguire quindi
# ausearch -m avc -ts recent
Qualora si noti il record PATH, controllare la proprietà/i permessi sul file e correggerli,
altrimenti registrare un bugzilla.

*****  Plugin catchall (9.59 confidence) suggests   **************************

If you believe that plymouthd should have the dac_override capability by default.
Then si dovrebbe riportare il problema come bug.
E' possibile generare un modulo di politica locale per consentire questo accesso.
Do
allow this access for now by executing:
# ausearch -c 'plymouthd' --raw | audit2allow -M my-plymouthd
# semodule -X 300 -i my-plymouthd.pp

Additional Information:
Source Context                system_u:system_r:plymouthd_t:s0
Target Context                system_u:system_r:plymouthd_t:s0
Target Objects                Unknown [ capability ]
Source                        plymouthd
Source Path                   plymouthd
Port                          <Sconosciuto>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.14.1-24.fc28.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     (removed)
Platform                      Linux (removed) 4.16.6-300.fc28.x86_64 #1 SMP Mon
                              Apr 30 14:27:38 UTC 2018 x86_64 x86_64
Alert Count                   1
First Seen                    2018-05-03 08:22:37 CEST
Last Seen                     2018-05-03 08:22:37 CEST
Local ID                      af3507f3-6183-4c1b-8b5a-02df7794f96b

Raw Audit Messages
type=AVC msg=audit(1525328557.29:414): avc:  denied  { dac_override } for  pid=6467 comm="plymouthd" capability=1  scontext=system_u:system_r:plymouthd_t:s0 tcontext=system_u:system_r:plymouthd_t:s0 tclass=capability permissive=1


Hash: plymouthd,plymouthd_t,plymouthd_t,capability,dac_override

Version-Release number of selected component:
selinux-policy-3.14.1-24.fc28.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.5
hashmarkername: setroubleshoot
kernel:         4.16.6-300.fc28.x86_64
type:           libreport