mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 14:14:01 +08:00
a2818ee4dc
Add a few livepatch modules and simple target modules that the included regression suite can run tests against: - basic livepatching (multiple patches, atomic replace) - pre/post (un)patch callbacks - shadow variable API Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Tested-by: Miroslav Benes <mbenes@suse.cz> Tested-by: Alice Ferrazzi <alice.ferrazzi@gmail.com> Acked-by: Joe Lawrence <joe.lawrence@redhat.com> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
94 lines
2.3 KiB
C
94 lines
2.3 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)");
|
|
|
|
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 0;
|
|
}
|
|
|
|
/* 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 struct klp_func no_funcs[] = {
|
|
{ }
|
|
};
|
|
|
|
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,
|
|
},
|
|
}, { }
|
|
};
|
|
|
|
static struct klp_patch patch = {
|
|
.mod = THIS_MODULE,
|
|
.objs = objs,
|
|
/* set .replace in the init function below for demo purposes */
|
|
};
|
|
|
|
static int test_klp_callbacks_demo2_init(void)
|
|
{
|
|
patch.replace = replace;
|
|
return klp_enable_patch(&patch);
|
|
}
|
|
|
|
static void test_klp_callbacks_demo2_exit(void)
|
|
{
|
|
}
|
|
|
|
module_init(test_klp_callbacks_demo2_init);
|
|
module_exit(test_klp_callbacks_demo2_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_INFO(livepatch, "Y");
|
|
MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
|
|
MODULE_DESCRIPTION("Livepatch test: livepatch demo2");
|