LSM: Make lsm_early_cred() and lsm_early_task() local functions.

Since current->cred == current->real_cred when ordered_lsm_init()
is called, and lsm_early_cred()/lsm_early_task() need to be called
between the amount of required bytes is determined and module specific
initialization function is called, we can move these calls from
individual modules to ordered_lsm_init().
Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: NCasey Schaufler <casey@schaufler-ca.com>
Signed-off-by: NJames Morris <james.morris@microsoft.com>

include/linux/lsm_hooks.h

@@ -2112,9 +2112,4 @@ static inline void security_delete_hooks(struct security_hook_list *hooks,
 
 extern int lsm_inode_alloc(struct inode *inode);
 
-#ifdef CONFIG_SECURITY
-void __init lsm_early_cred(struct cred *cred);
-void __init lsm_early_task(struct task_struct *task);
-#endif
-
 #endif /* ! __LINUX_LSM_HOOKS_H */

security/apparmor/lsm.c

@@ -1484,8 +1484,6 @@ static int __init set_init_ctx(void)
 {
 	struct cred *cred = (struct cred *)current->real_cred;
 
-	lsm_early_cred(cred);
-	lsm_early_task(current);
 	set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
 
 	return 0;

security/security.c

@@ -278,6 +278,9 @@ static void __init ordered_lsm_parse(const char *order, const char *origin)
 	kfree(sep);
 }
 
+static void __init lsm_early_cred(struct cred *cred);
+static void __init lsm_early_task(struct task_struct *task);
+
 static void __init ordered_lsm_init(void)
 {
 	struct lsm_info **lsm;
@@ -312,6 +315,8 @@ static void __init ordered_lsm_init(void)
 						    blob_sizes.lbs_inode, 0,
 						    SLAB_PANIC, NULL);
 
+	lsm_early_cred((struct cred *) current->cred);
+	lsm_early_task(current);
 	for (lsm = ordered_lsms; *lsm; lsm++)
 		initialize_lsm(*lsm);
 
@@ -465,17 +470,12 @@ static int lsm_cred_alloc(struct cred *cred, gfp_t gfp)
  * lsm_early_cred - during initialization allocate a composite cred blob
  * @cred: the cred that needs a blob
  *
- * Allocate the cred blob for all the modules if it's not already there
+ * Allocate the cred blob for all the modules
  */
-void __init lsm_early_cred(struct cred *cred)
+static void __init lsm_early_cred(struct cred *cred)
 {
-	int rc;
+	int rc = lsm_cred_alloc(cred, GFP_KERNEL);
 
-	if (cred == NULL)
-		panic("%s: NULL cred.\n", __func__);
-	if (cred->security != NULL)
-		return;
-	rc = lsm_cred_alloc(cred, GFP_KERNEL);
 	if (rc)
 		panic("%s: Early cred alloc failed.\n", __func__);
 }
@@ -589,17 +589,12 @@ int lsm_msg_msg_alloc(struct msg_msg *mp)
  * lsm_early_task - during initialization allocate a composite task blob
  * @task: the task that needs a blob
  *
- * Allocate the task blob for all the modules if it's not already there
+ * Allocate the task blob for all the modules
  */
-void __init lsm_early_task(struct task_struct *task)
+static void __init lsm_early_task(struct task_struct *task)
 {
-	int rc;
+	int rc = lsm_task_alloc(task);
 
-	if (task == NULL)
-		panic("%s: task cred.\n", __func__);
-	if (task->security != NULL)
-		return;
-	rc = lsm_task_alloc(task);
 	if (rc)
 		panic("%s: Early task alloc failed.\n", __func__);
 }

security/selinux/hooks.c

@@ -207,7 +207,6 @@ static void cred_init_security(void)
 	struct cred *cred = (struct cred *) current->real_cred;
 	struct task_security_struct *tsec;
 
-	lsm_early_cred(cred);
 	tsec = selinux_cred(cred);
 	tsec->osid = tsec->sid = SECINITSID_KERNEL;
 }

security/smack/smack_lsm.c

@@ -4671,8 +4671,6 @@ static __init int smack_init(void)
 	if (!smack_inode_cache)
 		return -ENOMEM;
 
-	lsm_early_cred(cred);
-
 	/*
 	 * Set the security state for the initial task.
 	 */

security/tomoyo/tomoyo.c

@@ -566,7 +566,6 @@ static int __init tomoyo_init(void)
 	/* register ourselves with the security framework */
 	security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo");
 	printk(KERN_INFO "TOMOYO Linux initialized\n");
-	lsm_early_cred(cred);
 	blob = tomoyo_cred(cred);
 	*blob = &tomoyo_kernel_domain;
 	tomoyo_mm_init();