LSM: Infrastructure management of the ipc security blob

Move management of the kern_ipc_perm->security and
msg_msg->security blobs out of the individual security
modules and into the security infrastructure. Instead
of allocating the blobs from within the modules the modules
tell the infrastructure how much space is required, and
the space is allocated there.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
[kees: adjusted for ordered init series]
Signed-off-by: Kees Cook <keescook@chromium.org>
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 9b39fef..40511a8 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -2034,6 +2034,8 @@
 	int	lbs_cred;
 	int	lbs_file;
 	int	lbs_inode;
+	int	lbs_ipc;
+	int	lbs_msg_msg;
 	int	lbs_task;
 };