This file is indexed.

/usr/share/mysql/policy/selinux/README is in mariadb-server-10.1 10.1.26-0+deb9u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Note: The included SELinux policy files can be used for MariaDB Galera cluster.
However, since these policies had been tested for a limited set of scenarios,
it is highly recommended that you run mysqld in "permissive" mode even with
these policies installed and report any denials on mariadb.org/jira.


How to generate and load the policy module of MariaDB Galera cluster ?
  * Generate the SELinux policy module.
    # cd <source>/policy/selinux/
    # make -f /usr/share/selinux/devel/Makefile mariadb-server.pp

  * Load the generated policy module.
    # semodule -i /path/to/mariadb-server.pp

  * Lastly, run the following command to allow tcp/4568 and udp/4567.
    # semanage port -a -t mysqld_port_t -p tcp 4568
    # semanage port -a -t mysqld_port_t -p udp 4567

How to run mysqld in permissve mode ?
  # semanage permissive -a mysqld_t