1 files changed, 72 insertions, 1 deletions

diff --git a/security/security.c b/security/security.c
index 54affd0ce6ad..2e250c7028eb 100644
--- a/security/security.c
+++ b/security/security.c
@@ -17,6 +17,8 @@
 #include <linux/kernel.h>
 #include <linux/security.h>
 
+/* Boot-time LSM user choice */
+static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1];
 
 /* things that live in dummy.c */
 extern struct security_operations dummy_security_ops;
@@ -67,13 +69,47 @@ int __init security_init(void)
         return 0;
 }
 
+/* Save user chosen LSM */
+static int __init choose_lsm(char *str)
+{
+        strncpy(chosen_lsm, str, SECURITY_NAME_MAX);
+        return 1;
+}
+__setup("security=", choose_lsm);
+
+/**
+ * security_module_enable - Load given security module on boot ?
+ * @ops: a pointer to the struct security_operations that is to be checked.
+ *
+ * Each LSM must pass this method before registering its own operations
+ * to avoid security registration races. This method may also be used
+ * to check if your LSM is currently loaded during kernel initialization.
+ *
+ * Return true if:
+ *      -The passed LSM is the one chosen by user at boot time,
+ *      -or user didsn't specify a specific LSM and we're the first to ask
+ *       for registeration permissoin,
+ *      -or the passed LSM is currently loaded.
+ * Otherwise, return false.
+ */
+int __init security_module_enable(struct security_operations *ops)
+{
+        if (!*chosen_lsm)
+                strncpy(chosen_lsm, ops->name, SECURITY_NAME_MAX);
+        else if (strncmp(ops->name, chosen_lsm, SECURITY_NAME_MAX))
+                return 0;
+
+        return 1;
+}
+
 /**
  * register_security - registers a security framework with the kernel
  * @ops: a pointer to the struct security_options that is to be registered
  *
  * This function is to allow a security module to register itself with the
  * kernel security subsystem.  Some rudimentary checking is done on the @ops
- * value passed to this function.
+ * value passed to this function. You'll need to check first if your LSM
+ * is allowed to register its @ops by calling security_module_enable(@ops).
  *
  * If there is already a security module registered with the kernel,
  * an error will be returned.  Otherwise 0 is returned on success.
@@ -523,6 +559,11 @@ int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer
         return security_ops->inode_listsecurity(inode, buffer, buffer_size);
 }
 
+void security_inode_getsecid(const struct inode *inode, u32 *secid)
+{
+        security_ops->inode_getsecid(inode, secid);
+}
+
 int security_file_permission(struct file *file, int mask)
 {
         return security_ops->file_permission(file, mask);
@@ -712,6 +753,11 @@ int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
         return security_ops->ipc_permission(ipcp, flag);
 }
 
+void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
+{
+        security_ops->ipc_getsecid(ipcp, secid);
+}
+
 int security_msg_msg_alloc(struct msg_msg *msg)
 {
         return security_ops->msg_msg_alloc_security(msg);
@@ -1111,3 +1157,28 @@ int security_key_permission(key_ref_t key_ref,
 }
 
 #endif  /* CONFIG_KEYS */
+
+#ifdef CONFIG_AUDIT
+
+int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
+{
+        return security_ops->audit_rule_init(field, op, rulestr, lsmrule);
+}
+
+int security_audit_rule_known(struct audit_krule *krule)
+{
+        return security_ops->audit_rule_known(krule);
+}
+
+void security_audit_rule_free(void *lsmrule)
+{
+        security_ops->audit_rule_free(lsmrule);
+}
+
+int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule,
+                              struct audit_context *actx)
+{
+        return security_ops->audit_rule_match(secid, field, op, lsmrule, actx);
+}
+
+#endif /* CONFIG_AUDIT */