On Thu, Nov 28, 2019 at 8:00 AM Marcelo Ricardo Leitner
[off-list ref] wrote:

I'm no SELinux expert, but my /etc/ssh/sshd_config has this nice handy
comment:
# If you want to change the port on a SELinux system, you have to tell
# SELinux about this change.
# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER

The kernel has no specific knowledge of 'ssh_port_t' and all I need to
do to allow such port, is run the command above. No compiler, etc.
The distribution would have to have a policy, say,
'unbindable_ports_t', and it could work similarly, I suppose, but I
have no knowledge on this part.

For security reasons, Android does not allow reloading selinux policy
after boot. I'm not a selinux expert either, but semanage-port(8) has:

       -N, --noreload
              Do not reload policy after commit

which suggests that it works by reloading the policy.