Note from Artem: The post's author, Justin Case, also known as jcase in the Android community, is an xda Elite Recognized Developer, AP team member, and an all-around knowledgeable guy when it comes to Android's internals. When he speaks, I tend to listen.
The Android world was slapped in the face when well-known developer AndreiLux made a post in the XDA Galaxy S4 forum titled [Info] Rooting will be impossible on newer stock kernels.
His post has caused some unwarranted drama in the community, and I wish to set this subject straight as much as I can. AndreiLux is pointing out a new feature in Samsung Galaxy S4 kernel called CONFIG_SEC_RESTRICT_SETUID.