// 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 pre_patch_ret;
|
module_param(pre_patch_ret, int, 0644);
|
MODULE_PARM_DESC(pre_patch_ret, "pre_patch_ret (default=0)");
|
|
static const char *const module_state[] = {
|
[MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
|
[MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
|
[MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
|
[MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
|
};
|
|
static void callback_info(const char *callback, struct klp_object *obj)
|
{
|
if (obj->mod)
|
pr_info("%s: %s -> %s\n", callback, obj->mod->name,
|
module_state[obj->mod->state]);
|
else
|
pr_info("%s: vmlinux\n", callback);
|
}
|
|
/* Executed on object patching (ie, patch enablement) */
|
static int pre_patch_callback(struct klp_object *obj)
|
{
|
callback_info(__func__, obj);
|
return pre_patch_ret;
|
}
|
|
/* Executed on object unpatching (ie, patch disablement) */
|
static void post_patch_callback(struct klp_object *obj)
|
{
|
callback_info(__func__, obj);
|
}
|
|
/* Executed on object unpatching (ie, patch disablement) */
|
static void pre_unpatch_callback(struct klp_object *obj)
|
{
|
callback_info(__func__, obj);
|
}
|
|
/* Executed on object unpatching (ie, patch disablement) */
|
static void post_unpatch_callback(struct klp_object *obj)
|
{
|
callback_info(__func__, obj);
|
}
|
|
static void patched_work_func(struct work_struct *work)
|
{
|
pr_info("%s\n", __func__);
|
}
|
|
static struct klp_func no_funcs[] = {
|
{}
|
};
|
|
static struct klp_func busymod_funcs[] = {
|
{
|
.old_name = "busymod_work_func",
|
.new_func = patched_work_func,
|
}, {}
|
};
|
|
static struct klp_object objs[] = {
|
{
|
.name = NULL, /* vmlinux */
|
.funcs = no_funcs,
|
.callbacks = {
|
.pre_patch = pre_patch_callback,
|
.post_patch = post_patch_callback,
|
.pre_unpatch = pre_unpatch_callback,
|
.post_unpatch = post_unpatch_callback,
|
},
|
}, {
|
.name = "test_klp_callbacks_mod",
|
.funcs = no_funcs,
|
.callbacks = {
|
.pre_patch = pre_patch_callback,
|
.post_patch = post_patch_callback,
|
.pre_unpatch = pre_unpatch_callback,
|
.post_unpatch = post_unpatch_callback,
|
},
|
}, {
|
.name = "test_klp_callbacks_busy",
|
.funcs = busymod_funcs,
|
.callbacks = {
|
.pre_patch = pre_patch_callback,
|
.post_patch = post_patch_callback,
|
.pre_unpatch = pre_unpatch_callback,
|
.post_unpatch = post_unpatch_callback,
|
},
|
}, { }
|
};
|
|
static struct klp_patch patch = {
|
.mod = THIS_MODULE,
|
.objs = objs,
|
};
|
|
static int test_klp_callbacks_demo_init(void)
|
{
|
return klp_enable_patch(&patch);
|
}
|
|
static void test_klp_callbacks_demo_exit(void)
|
{
|
}
|
|
module_init(test_klp_callbacks_demo_init);
|
module_exit(test_klp_callbacks_demo_exit);
|
MODULE_LICENSE("GPL");
|
MODULE_INFO(livepatch, "Y");
|
MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
|
MODULE_DESCRIPTION("Livepatch test: livepatch demo");
|
