[移动开发]RK Android8.1获取ROOT权限

RK Android8.1

平台：RK全平台 Android8.1

• 修改步骤

1. 添加启动服务

   --- a/init.box.rc
   +++ b/init.box.rc
   @@ -7,6 +7,7 @@ on property:sys.boot_completed=1
        # recover cpu fre.
        chmod  0644 /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
        write /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor interactive
   +    start rootservice
    
    on init
        write /proc/sys/vm/swappiness 100
   @@ -26,3 +27,10 @@ on boot
        chmod 0664 /sys/class/graphics/fb0/hdr_bt1886eotf
        chown root system /sys/class/graphics/fb0/hdr_st2084oetf
        chmod 0664 /sys/class/graphics/fb0/hdr_st2084oetf
   +
   +service rootservice /system/bin/rootsudaemon.sh
   +    user root
   +    group root
   +    disabled
   +    oneshot
   +    seclabel u:r:init:s0
   

2. 添加文件到system目录

   /system/bin/rootsudaemon.sh
   /system/lib/libsupol.so
   /system/xbin/su
   /system/xbin/daemonsu
   /system/xbin/supolicy
   

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