58 строки
1.3 KiB
C
58 строки
1.3 KiB
C
|
// 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");
|