Android 8.1添加系统服务,sepolicy相关配置

1. 写.aidl文件
2. 将.aidl文件添加到 frameworks/base/Android.mk 下的 LOCAL_SRC_FILES(此处 先make update-api 生成对应的文件 )
   3.新建 xxx service 和 xxx service manager
3. context.java添加服务注册名称, 添加该服务名称, 用于快捷注册和快捷引用

 /** @hide */
    @StringDef({
            SYSTEM_STATUS_SERVICE,
            POWER_SERVICE,
...})
  public static final String SYSTEM_STATUS_SERVICE  = "system_status";

5. 注册该service
   5.1 SystemService.java 中注册该service
   5.1.1 main -> run() -> startOtherService 中添加注册该service

  /**
     * Starts a miscellaneous grab bag of stuff that has yet to be refactored
     * and organized.
     */
    private void startOtherServices() {
...
            traceBeginAndSlog("xxxService");
            ServiceManager.addService(Context.xxx,
                    new xxxService(context));
            traceEnd();
...
}

5.2 找到SystemServiceRegistry的static{}, 并在其中注册该service

       registerService(Context.xxx, xxxServiceManager.class,
                new CachedServiceFetcher< xxxServiceManager>() {
                    @Override
                    public  xxxServiceManager createService(ContextImpl ctx) {
                        IBinder b = ServiceManager.getService(Context.SYSTEM_STATUS_SERVICE);
                        return new  xxxServiceManager(ctx, I xxxServiceManager.Stub.asInterface(b));
                    }
                });

===========================================
系统service注册,添加完毕,后续是selinux相关配置
============================================

一. sepolicy 部分添加

1. \system\sepolicy\public\service.te 定义服务名称和属性

type xxx_service,app_api_service, ephemeral_app_api_service, system_server_service, service_manager_type;

2.\system\sepolicy\private\service_contexts 添加服务名称

xxx u:object_r:xxx_service:s0

3.\system\sepolicy\private\compat\26.0\26.0.cil 文件最后添加

(typeattributeset xxx_service_26_0 (xxx_service))

4.\system\sepolicy\prebuilts\api\26.0\public\service.te 定义服务名称和属性

type xxx_service,app_api_service, ephemeral_app_api_service, system_server_service, service_manager_type;

5.\system\sepolicy\prebuilts\api\26.0\private\

service_contexts 添加服务名称

xxx u:object_r:xxx_service:s0

6.\system\sepolicy\prebuilts\api\26.0\nonplat_sepolicy.cil 添加相应配置
6.1 typeattributeset system_server_service 在最后添加自定义的服务 xxx_service_26_0

6.2 typeattributeset app_api_service 在最后添加自定义的服务 xxx_service_26_0

6.3 typeattributeset ephemeral_app_api_service 在最后添加自定义的服务 xxx_service_26_0

6.4 typeattributeset service_manager_type 在最后添加自定义的服务 xxx_service_26_0

6.5 添加一对 配置

(typeattribute xxx_service_26_0)
(roletype object_r xxx_service_26_0)

参考文献 :
https://blog.csdn.net/wan2g/article/details/88353385