Android: 启动init.rc 中service的权限问题

最新推荐文章于 2023-07-28 18:22:08 发布

zmyde2010

最新推荐文章于 2023-07-28 18:22:08 发布

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分类专栏： Android 文章标签： service android system permissions shell null

本文链接：https://blog.youkuaiyun.com/zmyde2010/article/details/6312615

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在Android中，通过property_set启动init.rc服务通常需要AID_SYSTEM或AID_ROOT权限。遇到权限问题时，可以检查并修改/system/core/init/property_service.c的control_perms数组，将对应服务与需要权限的uid（如AID_WIFI）添加到列表，以允许相应进程启动或停止服务。

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通过property_set("ctl.start", service_xx);

来启动init.rc中的service是一个很方便方法来调用某个可执行程序或某个脚本程序

service service_xx /system/bin/xx

disabled
oneshot

但在非AID_ROOT、AID_SYSTEM 用户的进程中调用ctl.start ctl.stop会碰到权限问题:

system/core/init/property_service.c

/* * White list of UID that are allowed to start/stop services. * Currently there are no user apps that require. */ struct { const char *service; unsigned int uid; unsigned int gid; } control_perms[] = { { "dumpstate",AID_SHELL, AID_LOG }, {NULL, 0, 0 } }; /* * Checks permissions for starting/stoping system services. * AID_SYSTEM and AID_ROOT are always allowed. * * Returns 1 if uid allowed, 0 otherwise. */ static int check_control_perms(const char *name, int uid, int gid) { int i; if (uid == AID_SYSTEM || uid == AID_ROOT) return 1;