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a2818ee4 JL |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2018 Joe Lawrence <joe.lawrence@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 | static int replace; | |
11 | module_param(replace, int, 0644); | |
12 | MODULE_PARM_DESC(replace, "replace (default=0)"); | |
13 | ||
14 | #include <linux/seq_file.h> | |
15 | static int livepatch_meminfo_proc_show(struct seq_file *m, void *v) | |
16 | { | |
17 | seq_printf(m, "%s: %s\n", THIS_MODULE->name, | |
18 | "this has been live patched"); | |
19 | return 0; | |
20 | } | |
21 | ||
22 | static struct klp_func funcs[] = { | |
23 | { | |
24 | .old_name = "meminfo_proc_show", | |
25 | .new_func = livepatch_meminfo_proc_show, | |
26 | }, {} | |
27 | }; | |
28 | ||
29 | static struct klp_object objs[] = { | |
30 | { | |
31 | /* name being NULL means vmlinux */ | |
32 | .funcs = funcs, | |
33 | }, {} | |
34 | }; | |
35 | ||
36 | static struct klp_patch patch = { | |
37 | .mod = THIS_MODULE, | |
38 | .objs = objs, | |
39 | /* set .replace in the init function below for demo purposes */ | |
40 | }; | |
41 | ||
42 | static int test_klp_atomic_replace_init(void) | |
43 | { | |
44 | patch.replace = replace; | |
45 | return klp_enable_patch(&patch); | |
46 | } | |
47 | ||
48 | static void test_klp_atomic_replace_exit(void) | |
49 | { | |
50 | } | |
51 | ||
52 | module_init(test_klp_atomic_replace_init); | |
53 | module_exit(test_klp_atomic_replace_exit); | |
54 | MODULE_LICENSE("GPL"); | |
55 | MODULE_INFO(livepatch, "Y"); | |
56 | MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>"); | |
57 | MODULE_DESCRIPTION("Livepatch test: atomic replace"); |