Security is one of the important reasons GNU/Linux is chosen over MS Windows. Many folks will claim that GNU/Linux just isn’t targeted as often. Could be—but it could also be that it isn’t targeted as often due to its design. SELinux takes this concept one step further. Not just satisfied with the inherent security, SELinux has been developed by a team of concerned professionals and is now included by default in the 2.6 kernel. Yes, you may have SELinux already and didn’t even know it.