mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
255e732c61
Introduce arch_klp_init_object_loaded() to complete any additional arch-specific tasks during patching. Architecture code may override this function. Signed-off-by: Jessica Yu <jeyu@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
134 lines
3.8 KiB
C
134 lines
3.8 KiB
C
/*
|
|
* livepatch.h - Kernel Live Patching Core
|
|
*
|
|
* Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
|
|
* Copyright (C) 2014 SUSE
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef _LINUX_LIVEPATCH_H_
|
|
#define _LINUX_LIVEPATCH_H_
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/ftrace.h>
|
|
|
|
#if IS_ENABLED(CONFIG_LIVEPATCH)
|
|
|
|
#include <asm/livepatch.h>
|
|
|
|
enum klp_state {
|
|
KLP_DISABLED,
|
|
KLP_ENABLED
|
|
};
|
|
|
|
/**
|
|
* struct klp_func - function structure for live patching
|
|
* @old_name: name of the function to be patched
|
|
* @new_func: pointer to the patched function code
|
|
* @old_sympos: a hint indicating which symbol position the old function
|
|
* can be found (optional)
|
|
* @old_addr: the address of the function being patched
|
|
* @kobj: kobject for sysfs resources
|
|
* @state: tracks function-level patch application state
|
|
* @stack_node: list node for klp_ops func_stack list
|
|
*/
|
|
struct klp_func {
|
|
/* external */
|
|
const char *old_name;
|
|
void *new_func;
|
|
/*
|
|
* The old_sympos field is optional and can be used to resolve
|
|
* duplicate symbol names in livepatch objects. If this field is zero,
|
|
* it is expected the symbol is unique, otherwise patching fails. If
|
|
* this value is greater than zero then that occurrence of the symbol
|
|
* in kallsyms for the given object is used.
|
|
*/
|
|
unsigned long old_sympos;
|
|
|
|
/* internal */
|
|
unsigned long old_addr;
|
|
struct kobject kobj;
|
|
enum klp_state state;
|
|
struct list_head stack_node;
|
|
};
|
|
|
|
/**
|
|
* struct klp_object - kernel object structure for live patching
|
|
* @name: module name (or NULL for vmlinux)
|
|
* @funcs: function entries for functions to be patched in the object
|
|
* @kobj: kobject for sysfs resources
|
|
* @mod: kernel module associated with the patched object
|
|
* (NULL for vmlinux)
|
|
* @state: tracks object-level patch application state
|
|
*/
|
|
struct klp_object {
|
|
/* external */
|
|
const char *name;
|
|
struct klp_func *funcs;
|
|
|
|
/* internal */
|
|
struct kobject kobj;
|
|
struct module *mod;
|
|
enum klp_state state;
|
|
};
|
|
|
|
/**
|
|
* struct klp_patch - patch structure for live patching
|
|
* @mod: reference to the live patch module
|
|
* @objs: object entries for kernel objects to be patched
|
|
* @list: list node for global list of registered patches
|
|
* @kobj: kobject for sysfs resources
|
|
* @state: tracks patch-level application state
|
|
*/
|
|
struct klp_patch {
|
|
/* external */
|
|
struct module *mod;
|
|
struct klp_object *objs;
|
|
|
|
/* internal */
|
|
struct list_head list;
|
|
struct kobject kobj;
|
|
enum klp_state state;
|
|
};
|
|
|
|
#define klp_for_each_object(patch, obj) \
|
|
for (obj = patch->objs; obj->funcs || obj->name; obj++)
|
|
|
|
#define klp_for_each_func(obj, func) \
|
|
for (func = obj->funcs; \
|
|
func->old_name || func->new_func || func->old_sympos; \
|
|
func++)
|
|
|
|
int klp_register_patch(struct klp_patch *);
|
|
int klp_unregister_patch(struct klp_patch *);
|
|
int klp_enable_patch(struct klp_patch *);
|
|
int klp_disable_patch(struct klp_patch *);
|
|
|
|
void arch_klp_init_object_loaded(struct klp_patch *patch,
|
|
struct klp_object *obj);
|
|
|
|
/* Called from the module loader during module coming/going states */
|
|
int klp_module_coming(struct module *mod);
|
|
void klp_module_going(struct module *mod);
|
|
|
|
#else /* !CONFIG_LIVEPATCH */
|
|
|
|
static inline int klp_module_coming(struct module *mod) { return 0; }
|
|
static inline void klp_module_going(struct module *mod) { }
|
|
|
|
#endif /* CONFIG_LIVEPATCH */
|
|
|
|
#endif /* _LINUX_LIVEPATCH_H_ */
|