Distributors have been enabling the SELinux security module for nearly
20 years now, and many administrators have been disabling it on their
systems for almost as long. There are a few ways in which SELinux can be
disabled on any given system, including command-line options, a run-time
switch, or simply not loading a policy after boot. One of those ways,
however, is about to be disabled itself.

Source: LWN.net – [$] Disabling SELinux’s runtime disable