[PATCH v4 10/34] lsm: rework lsm_active_cnt and lsm_idlist[]

[Paul Moore <paul@paul-moore.com>]

Move the LSM active count and lsm_id list declarations out of a header
that is visible across the kernel and into a header that is limited to
the LSM framework.  This not only helps keep the include/linux headers
smaller and cleaner, it helps prevent misuse of these variables.

Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: John Johansen <john.johhansen@canonical.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
---
 include/linux/security.h | 2 --
 security/lsm.h           | 5 +++++
 security/lsm_init.c      | 6 ------
 security/lsm_syscalls.c  | 2 ++
 security/security.c      | 3 +++
 5 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/include/linux/security.h b/include/linux/security.h
index 521bcb5b9717..8560c50edd2e 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -167,8 +167,6 @@ struct lsm_prop {
 };
 
 extern const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1];
-extern u32 lsm_active_cnt;
-extern const struct lsm_id *lsm_idlist[];
 
 /* These functions are in security/commoncap.c */
 extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
diff --git a/security/lsm.h b/security/lsm.h
index 0e1731bad4a7..dbe755c45e57 100644
--- a/security/lsm.h
+++ b/security/lsm.h
@@ -7,6 +7,11 @@
 #define _LSM_H_
 
 #include <linux/lsm_hooks.h>
+#include <linux/lsm_count.h>
+
+/* List of configured LSMs */
+extern unsigned int lsm_active_cnt;
+extern const struct lsm_id *lsm_idlist[];
 
 /* LSM blob configuration */
 extern struct lsm_blob_sizes blob_sizes;
diff --git a/security/lsm_init.c b/security/lsm_init.c
index 2e76cefb1585..9e495a36a332 100644
--- a/security/lsm_init.c
+++ b/security/lsm_init.c
@@ -217,12 +217,6 @@ static void __init initialize_lsm(struct lsm_info *lsm)
 	}
 }
 
-/*
- * Current index to use while initializing the lsm id list.
- */
-u32 lsm_active_cnt __ro_after_init;
-const struct lsm_id *lsm_idlist[MAX_LSM_COUNT];
-
 /* Populate ordered LSMs list from comma-separated LSM name list. */
 static void __init ordered_lsm_parse(const char *order, const char *origin)
 {
diff --git a/security/lsm_syscalls.c b/security/lsm_syscalls.c
index 8440948a690c..5648b1f0ce9c 100644
--- a/security/lsm_syscalls.c
+++ b/security/lsm_syscalls.c
@@ -17,6 +17,8 @@
 #include <linux/lsm_hooks.h>
 #include <uapi/linux/lsm.h>
 
+#include "lsm.h"
+
 /**
  * lsm_name_to_attr - map an LSM attribute name to its ID
  * @name: name of the attribute
diff --git a/security/security.c b/security/security.c
index ff6da6735e2a..add46073af0c 100644
--- a/security/security.c
+++ b/security/security.c
@@ -73,6 +73,9 @@ const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX + 1] = {
 	[LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
 };
 
+unsigned int lsm_active_cnt __ro_after_init;
+const struct lsm_id *lsm_idlist[MAX_LSM_COUNT];
+
 struct lsm_blob_sizes blob_sizes;
 
 struct kmem_cache *lsm_file_cache;
-- 
2.51.0