1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
3 
4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5 
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/livepatch.h>
9 
10 #include <linux/seq_file.h>
11 static int livepatch_cmdline_proc_show(struct seq_file *m, void *v)
12 {
13 	seq_printf(m, "%s: %s\n", THIS_MODULE->name,
14 		   "this has been live patched");
15 	return 0;
16 }
17 
18 static struct klp_func funcs[] = {
19 	{
20 		.old_name = "cmdline_proc_show",
21 		.new_func = livepatch_cmdline_proc_show,
22 	}, { }
23 };
24 
25 static struct klp_object objs[] = {
26 	{
27 		/* name being NULL means vmlinux */
28 		.funcs = funcs,
29 	}, { }
30 };
31 
32 static struct klp_patch patch = {
33 	.mod = THIS_MODULE,
34 	.objs = objs,
35 };
36 
37 static int test_klp_livepatch_init(void)
38 {
39 	return klp_enable_patch(&patch);
40 }
41 
42 static void test_klp_livepatch_exit(void)
43 {
44 }
45 
46 module_init(test_klp_livepatch_init);
47 module_exit(test_klp_livepatch_exit);
48 MODULE_LICENSE("GPL");
49 MODULE_INFO(livepatch, "Y");
50 MODULE_AUTHOR("Seth Jennings <sjenning@redhat.com>");
51 MODULE_DESCRIPTION("Livepatch test: livepatch module");
52