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