Debug skill of the SEpolicy changes

1. load the build environment

  source build/envsetup.sh
  lunch [project]-userdebug

1. build the system_sepolicy module

   mmma system/sepolicy

Then it will update the file in this dirctory as bellow:

out/target/product/[product]/system/etc/selinux
out/target/product/[product]/vendor/etc/selinux

1. Push the selinux file to device

   adb push  out/target/product/[product]/system/etc/selinux   /system/etc/ 
   adb push  out/target/product/[product]/vendor/etc/selinux   /vendor/etc/

NOTE: The target file will produced in out/ after single make command (mmma), and it is copied from the out_sys/ and out_vnd/, they are same.

1. reboot the device

After restarted, you can check the modify whether work.