LSM: Fix up the description of the root_plug code to try to make it clearer.

security/Kconfig

@@ -27,8 +27,11 @@ config SECURITY_ROOTPLUG
 	depends on SECURITY!=n
 	help
 	  This is a sample LSM module that should only be used as such.
-	  It enables control over processes being created by root users
-	  if a specific USB device is not present in the system.
+	  It prevents any programs running with egid == 0 if a specific
+	  USB device is not present in the system.
+
+	  See <http://www.linuxjournal.com/article.php?sid=6279> for
+	  more information about this module.
 	  
 	  If you are unsure how to answer this question, answer N.
 

security/root_plug.c

@@ -13,6 +13,9 @@
  * If you want to turn this into something with a semblance of security,
  * you need to hook the task_* functions also.
  *
+ * See http://www.linuxjournal.com/article.php?sid=6279 for more information
+ * about this code.
+ *
  *	This program is free software; you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License as
  *	published by the Free Software Foundation, version 2 of the