[PATCH] selinux: Clear selinux_enabled flag upon runtime disable.

Clear selinux_enabled flag upon runtime disable of SELinux by userspace,
and make sure it is defined even if selinux= boot parameter support is
not enabled in configuration.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: James Morris <jmorris@namei.org>
Tested-by: Jon Smirl <jonsmirl@gmail.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

security/selinux/hooks.c

@@ -101,6 +101,8 @@ static int __init selinux_enabled_setup(char *str)
 	return 1;
 }
 __setup("selinux=", selinux_enabled_setup);
+#else
+int selinux_enabled = 1;
 #endif
 
 /* Original (dummy) security module. */
@@ -4535,6 +4537,7 @@ int selinux_disable(void)
 	printk(KERN_INFO "SELinux:  Disabled at runtime.\n");
 
 	selinux_disabled = 1;
+	selinux_enabled = 0;
 
 	/* Reset security_ops to the secondary module, dummy or capability. */
 	security_ops = secondary_ops;

security/selinux/include/security.h

@@ -29,12 +29,7 @@
 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
 #define POLICYDB_VERSION_MAX   POLICYDB_VERSION_AVTAB
 
-#ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
 extern int selinux_enabled;
-#else
-#define selinux_enabled 1
-#endif
-
 extern int selinux_mls_enabled;
 
 int security_load_policy(void * data, size_t len);