ci_sessions permissions

Hello,
What permissions should ci_sessions have?
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$config['sess_driver'] = 'files';
$config['sess_save_path'] = FCPATH.'ci_sessions';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;