linux/Documentation/ABI/obsolete/sysfs-selinux-disable
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   1What:           /sys/fs/selinux/disable
   2Date:           April 2005 (predates git)
   3KernelVersion:  2.6.12-rc2 (predates git)
   4Contact:        selinux@vger.kernel.org
   5Description:
   6
   7        The selinuxfs "disable" node allows SELinux to be disabled at runtime
   8        prior to a policy being loaded into the kernel.  If disabled via this
   9        mechanism, SELinux will remain disabled until the system is rebooted.
  10
  11        The preferred method of disabling SELinux is via the "selinux=0" boot
  12        parameter, but the selinuxfs "disable" node was created to make it
  13        easier for systems with primitive bootloaders that did not allow for
  14        easy modification of the kernel command line.  Unfortunately, allowing
  15        for SELinux to be disabled at runtime makes it difficult to secure the
  16        kernel's LSM hooks using the "__ro_after_init" feature.
  17
  18        Thankfully, the need for the SELinux runtime disable appears to be
  19        gone, the default Kconfig configuration disables this selinuxfs node,
  20        and only one of the major distributions, Fedora, supports disabling
  21        SELinux at runtime.  Fedora is in the process of removing the
  22        selinuxfs "disable" node and once that is complete we will start the
  23        slow process of removing this code from the kernel.
  24
  25        More information on /sys/fs/selinux/disable can be found under the
  26        CONFIG_SECURITY_SELINUX_DISABLE Kconfig option.
  27