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>

2 files changed, 18 insertions, 1 deletions

diff --git a/Documentation/DocBook/kernel-api.tmpl b/Documentation/DocBook/kernel-api.tmpl
index 083258f0eab5..d3290c46af51 100644
--- a/Documentation/DocBook/kernel-api.tmpl
+++ b/Documentation/DocBook/kernel-api.tmpl
@@ -340,7 +340,7 @@ X!Earch/x86/kernel/mca_32.c
 
   <chapter id="security">
      <title>Security Framework</title>
-!Esecurity/security.c
+!Isecurity/security.c
   </chapter>
 
   <chapter id="audit">
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a0ed205e5351..63bda3637085 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -75,10 +75,12 @@ parameter is applicable:
         PPT     Parallel port support is enabled.
         PS2     Appropriate PS/2 support is enabled.
         RAM     RAM disk support is enabled.
+        ROOTPLUG The example Root Plug LSM is enabled.
         S390    S390 architecture is enabled.
         SCSI    Appropriate SCSI support is enabled.
                         A lot of drivers has their options described inside of
                         Documentation/scsi/.
+        SECURITY Different security models are enabled.
         SELINUX SELinux support is enabled.
         SERIAL  Serial support is enabled.
         SH      SuperH architecture is enabled.
@@ -373,6 +375,12 @@ and is between 256 and 4096 characters. It is defined in the file
                         possible to determine what the correct size should be.
                         This option provides an override for these situations.
 
+        capability.disable=
+                        [SECURITY] Disable capabilities.  This would normally
+                        be used only if an alternative security model is to be
+                        configured.  Potentially dangerous and should only be
+                        used if you are entirely sure of the consequences.
+
         chandev=        [HW,NET] Generic channel device initialisation
 
         checkreqprot    [SELINUX] Set initial checkreqprot flag value.
@@ -1539,6 +1547,15 @@ and is between 256 and 4096 characters. It is defined in the file
                         Useful for devices that are detected asynchronously
                         (e.g. USB and MMC devices).
 
+        root_plug.vendor_id=
+                        [ROOTPLUG] Override the default vendor ID
+
+        root_plug.product_id=
+                        [ROOTPLUG] Override the default product ID
+
+        root_plug.debug=
+                        [ROOTPLUG] Enable debugging output
+
         rw              [KNL] Mount root device read-write on boot
 
         S               [KNL] Run init in single mode