From cfdbecef5b657aec18179bc7651ad5f19b393f80 Mon Sep 17 00:00:00 2001
From: DavadDi <dwh0403@163.com>
Date: Sun, 10 Apr 2022 19:42:05 +0800
Subject: [PATCH] add get_inst.c

---
 hello_kernel_module/get_inst.c | 43 ++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 hello_kernel_module/get_inst.c

diff --git a/hello_kernel_module/get_inst.c b/hello_kernel_module/get_inst.c
new file mode 100644
index 0000000..ad3ff06
--- /dev/null
+++ b/hello_kernel_module/get_inst.c
@@ -0,0 +1,43 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/kprobes.h>
+
+static struct kprobe kp = {
+    .symbol_name = "kallsyms_lookup_name"
+};
+
+static int __init hello_init(void)
+{
+    typedef unsigned long (*kallsyms_lookup_name_t)(const char *name);
+    kallsyms_lookup_name_t kallsyms_lookup_name;
+    int i = 0;
+    register_kprobe(&kp);
+    kallsyms_lookup_name = (kallsyms_lookup_name_t) kp.addr;
+    unregister_kprobe(&kp);
+
+    char *func_addr = (char *)kallsyms_lookup_name("__do_sys_fork");
+
+    for (i = 0; i < 5; i++)
+    {
+	pr_info("fun addr 0x%02x ", (u8)func_addr[i]);
+    }
+
+    pr_info("fun addr 0x%lx\n", func_addr);
+    return 0;
+}
+module_init(hello_init);
+
+
+static void __exit hello_exit(void)
+{
+    printk("Hello World Module Exit\n");
+}
+module_exit(hello_exit);
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("dwh0403");
+MODULE_DESCRIPTION("hello world module");
+MODULE_ALIAS("hello_module");
+