Documentation,selinux: fix references to old selinuxfs mount point

selinuxfs was originally mounted on /selinux, and various docs and
kconfig help texts referred to nodes under it.  In Linux 3.0,
/sys/fs/selinux was introduced as the preferred mount point for selinuxfs.
Fix all the old references to /selinux/ to /sys/fs/selinux/.
While we are there, update the description of the selinux boot parameter
to reflect the fact that the default value is always 1 since
commit be6ec88f ("selinux: Remove SECURITY_SELINUX_BOOTPARAM_VALUE")
and drop discussion of runtime disable since it is deprecated.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>

Documentation/admin-guide/kernel-parameters.txt

@@ -511,7 +511,7 @@
 			1 -- check protection requested by application.
 			Default value is set via a kernel config option.
 			Value can be changed at runtime via
-				/selinux/checkreqprot.
+				/sys/fs/selinux/checkreqprot.
 
 	cio_ignore=	[S390]
 			See Documentation/s390/common_io.rst for details.
@@ -1245,7 +1245,8 @@
 			0 -- permissive (log only, no denials).
 			1 -- enforcing (deny and log).
 			Default value is 0.
-			Value can be changed at runtime via /selinux/enforce.
+			Value can be changed at runtime via
+			/sys/fs/selinux/enforce.
 
 	erst_disable	[ACPI]
 			Disable Error Record Serialization Table (ERST)
@@ -4348,9 +4349,7 @@
 			See security/selinux/Kconfig help text.
 			0 -- disable.
 			1 -- enable.
-			Default value is set via kernel config option.
-			If enabled at boot time, /selinux/disable can be used
-			later to disable prior to initial policy load.
+			Default value is 1.
 
 	apparmor=	[APPARMOR] Disable or enable AppArmor at boot time
 			Format: { "0" | "1" }

security/selinux/Kconfig

@@ -58,7 +58,8 @@ config SECURITY_SELINUX_DEVELOP
 	  kernel will start in permissive mode (log everything, deny nothing)
 	  unless you specify enforcing=1 on the kernel command line.  You
 	  can interactively toggle the kernel between enforcing mode and
-	  permissive mode (if permitted by the policy) via /selinux/enforce.
+	  permissive mode (if permitted by the policy) via
+	  /sys/fs/selinux/enforce.
 
 config SECURITY_SELINUX_AVC_STATS
 	bool "NSA SELinux AVC Statistics"
@@ -66,7 +67,7 @@ config SECURITY_SELINUX_AVC_STATS
 	default y
 	help
 	  This option collects access vector cache statistics to
-	  /selinux/avc/cache_stats, which may be monitored via
+	  /sys/fs/selinux/avc/cache_stats, which may be monitored via
 	  tools such as avcstat.
 
 config SECURITY_SELINUX_CHECKREQPROT_VALUE
@@ -85,7 +86,7 @@ config SECURITY_SELINUX_CHECKREQPROT_VALUE
 	  default to checking the protection requested by the application.
 	  The checkreqprot flag may be changed from the default via the
 	  'checkreqprot=' boot parameter.  It may also be changed at runtime
-	  via /selinux/checkreqprot if authorized by policy.
+	  via /sys/fs/selinux/checkreqprot if authorized by policy.
 
 	  If you are unsure how to answer this question, answer 0.