security/lock_down.c

   1 /* Lock down the kernel
   2  *
   3  * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11
  12 #include <linux/security.h>
  13 #include <linux/export.h>
  14
  15 static __read_mostly bool kernel_locked_down;
  16
  17 /*
  18  * Put the kernel into lock-down mode.
  19  */
  20 void lock_kernel_down(void)
  21 {
  22         kernel_locked_down = true;
  23 }
  24
  25 /*
  26  * Take the kernel out of lockdown mode.
  27  */
  28 void lift_kernel_lockdown(void)
  29 {
  30         kernel_locked_down = false;
  31 }
  32
  33 /**
  34  * kernel_is_locked_down - Find out if the kernel is locked down
  35  */
  36 bool kernel_is_locked_down(void)
  37 {
  38         return kernel_locked_down;
  39 }
  40 EXPORT_SYMBOL(kernel_is_locked_down);