// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/kernel.h> #include <linux/livepatch.h> static int replace; module_param(replace, int, 0644); MODULE_PARM_DESC(replace, "replace (default=0)"); #include <linux/seq_file.h> static int livepatch_meminfo_proc_show(struct seq_file *m, void *v) { seq_printf(m, "%s: %s\n", THIS_MODULE->name, "this has been live patched"); return 0; } static struct klp_func funcs[] = { { .old_name = "meminfo_proc_show", .new_func = livepatch_meminfo_proc_show, }, {} }; static struct klp_object objs[] = { { /* name being NULL means vmlinux */ .funcs = funcs, }, {} }; static struct klp_patch patch = { .mod = THIS_MODULE, .objs = objs, /* set .replace in the init function below for demo purposes */ }; static int test_klp_atomic_replace_init(void) { patch.replace = replace; return klp_enable_patch(&patch); } static void test_klp_atomic_replace_exit(void) { } module_init(test_klp_atomic_replace_init); module_exit(test_klp_atomic_replace_exit); MODULE_LICENSE("GPL"); MODULE_INFO(livepatch, "Y"); MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>"); MODULE_DESCRIPTION("Livepatch test: atomic replace");