diff -drupN a/security/fivm.c b/security/fivm.c
--- a/security/fivm.c	1970-01-01 03:00:00.000000000 +0300
+++ b/security/fivm.c	2022-06-12 05:28:14.000000000 +0300
@@ -0,0 +1,53 @@
+/*
+ *
+ * Copyright (C) 2014 Allwinner Ltd.
+ *
+ * Author:
+ *	Ryan Chen <ryanchen@allwinnertech.com>
+ *
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License as published by
+ *	the Free Software Foundation; either version 2 of the License, or
+ *	(at your option) any later version.
+ */
+
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/security.h>
+#include <linux/fivm.h>
+
+static struct fivm_operation fivm_ops = {NULL, NULL};
+int fivm_mmap_verify(struct file *file, unsigned long prot)
+{
+	if (fivm_ops.mmap_verify)
+		return fivm_ops.mmap_verify(file, prot);
+	else
+		return 0;
+}
+int fivm_open_verify(struct file *file, const char *pathname, int mask)
+{
+	if (fivm_ops.open_verify)
+		return fivm_ops.open_verify(file, pathname, mask);
+	else
+		return 0;
+}
+
+int fivm_register_func(
+		int (*mmap_verify)(struct file *, unsigned long),
+		int (*open_verify)(struct file *, const char *, int))
+{
+	memset(&fivm_ops, 0, sizeof(fivm_ops));
+	fivm_ops.mmap_verify = mmap_verify;
+	fivm_ops.open_verify = open_verify;
+	return 0;
+}
+EXPORT_SYMBOL(fivm_register_func);
+
+int fivm_unregister_func(void)
+{
+	memset(&fivm_ops, 0, sizeof(fivm_ops));
+	return 0;
+}
+EXPORT_SYMBOL(fivm_unregister_func);
+