keys.conf

[@MODEMCONFIG]
ALL : SonyOpenTelephony/ModemConfig/app_cert.x509.pem

mac_permissions.xml

<policy>
    <signer signature="@MODEMCONFIG" >
        <seinfo value="modemconfigapp" />
    </signer>
</policy>

modemconfig_app.te

type modemconfig_app, domain;

app_domain(modemconfig_app)

# Allow modemconfig_app to find app_api_service
allow modemconfig_app app_api_service:service_manager find;

# Allow modemconfig_app read and write /data/data subdirectory
allow modemconfig_app app_data_file:dir create_dir_perms;
allow modemconfig_app app_data_file:{ file lnk_file } create_file_perms;

# Allow modemconfig_app to set cust_system_prop
set_prop(modemconfig_app, cust_system_prop)

seapp_contexts

user=_app seinfo=modemconfigapp name=com.sony.opentelephony.modemconfig isPrivApp=true domain=modemconfig_app type=app_data_file