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Description of problem:
As a new feature added in chrony-4.2, chronyd supports an experimental NTP-over-PTP protocol in order to get HW timestamps on NICs which can timestamp PTP packets but not NTP packets.

The selinux policy seems to be preventing chronyd from binding to the PTP socket 319.

In system log:
Aug 16 11:56:33 rhel8 chronyd[974]: Could not open NTP socket on 0.0.0.0:319
Aug 16 11:56:33 rhel8 chronyd[974]: Could not open NTP socket on [::]:319

In audit log:
type=AVC msg=audit(1660643793.324:174): avc:  denied  { name_bind } for  pid=974 comm="chronyd" src=319 scontext=system_u:system_r:chronyd_t:s0 tcontext=system_u:object_r:reserved_port_t:s0 tclass=udp_socket permissive=0

With disabled enforcing there are no other messages.

Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-106.el8.noarch
chrony-4.2-1.el8.x86_64

How reproducible:
always

Steps to Reproduce:
1. cat <<EOF >> /etc/chrony.conf
allow
ptpport 319
server 127.0.0.1 port 319 minpoll 0 maxpoll 0
EOF
2. systemctl restart chronyd
3. wait 5 seconds
4. chronyc ntpdata 127.0.0.1 | grep 'Total RX'

Actual results:
0

Expected results:
> 0

Additional info:

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (selinux-policy bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:7691