Check system directory permission

When you're root you can change the permissions on common system directories, this method checks if any of these following paths are writable.

• /system
• /system/bin
• /system/sbin
• /system/xbin
• /vendor/bin
• /sbin
• /etc

Your task is to bypass root detecting using android system directory permission check. you can verify your flag at http://ctf.hpandro.raviramesh.info