Re: [PATCH] net: introduce ip_local_unbindable_ports sysctl

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On Thu, Nov 28, 2019 at 8:00 AM Marcelo Ricardo Leitner
<marcelo.leitner@xxxxxxxxx> 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.



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