security: Convert LSM into a static interface

Convert LSM into a static interface, as the ability to unload a security
module is not required by in-tree users and potentially complicates the
overall security architecture.

Needlessly exported LSM symbols have been unexported, to help reduce API
abuse.

Parameters for the capability and root_plug modules are now specified
at boot.

The SECURITY_FRAMEWORK_VERSION macro has also been removed.

In a nutshell, there is no safe way to unload an LSM.  The modular interface
is thus unecessary and broken infrastructure.  It is used only by out-of-tree
modules, which are often binary-only, illegal, abusive of the API and
dangerous, e.g.  silently re-vectoring SELinux.

[akpm@linux-foundation.org: cleanups]
[akpm@linux-foundation.org: USB Kconfig fix]
[randy.dunlap@oracle.com: fix LSM kernel-doc]
Signed-off-by: James Morris <jmorris@namei.org>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: "Serge E. Hallyn" <serue@us.ibm.com>
Acked-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 24 deletions

diff --git a/security/capability.c b/security/capability.c
index 38296a005465..fda6a14cb24d 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -8,7 +8,6 @@
  *
  */
 
-#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/security.h>
@@ -52,7 +51,6 @@ static int secondary;
 
 static int capability_disable;
 module_param_named(disable, capability_disable, int, 0);
-MODULE_PARM_DESC(disable, "To disable capabilities module set disable = 1");
 
 static int __init capability_init (void)
 {
@@ -75,26 +73,4 @@ static int __init capability_init (void)
 	return 0;
 }
 
-static void __exit capability_exit (void)
-{
-	if (capability_disable)
-		return;
-	/* remove ourselves from the security framework */
-	if (secondary) {
-		if (mod_unreg_security (KBUILD_MODNAME, &capability_ops))
-			printk (KERN_INFO "Failure unregistering capabilities "
-				"with primary module.\n");
-		return;
-	}
-
-	if (unregister_security (&capability_ops)) {
-		printk (KERN_INFO
-			"Failure unregistering capabilities with the kernel\n");
-	}
-}
-
 security_initcall (capability_init);
-module_exit (capability_exit);
-
-MODULE_DESCRIPTION("Standard Linux Capabilities Security Module");
-MODULE_LICENSE("GPL");