mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 23:30:53 +07:00
cad706df7e
Make kobj variable (of type struct kobject) statically allocated in klp_object structure. It will allow us to move in the func-object-patch hierarchy through kobject links. The only reason to have it dynamic was to not have empty release callback in the code. However we have empty callbacks for function and patch in the code now, so it is no longer valid and the advantage of static allocation is clear. Signed-off-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Jiri Slaby <jslaby@suse.cz> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> 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_addr: a hint conveying at what address the old function
|
|
* can be found (optional, vmlinux patches only)
|
|
* @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_addr field is optional and can be used to resolve
|
|
* duplicate symbol names in the vmlinux object. If this
|
|
* information is not present, the symbol is located by name
|
|
* with kallsyms. If the name is not unique and old_addr is
|
|
* not provided, the patch application fails as there is no
|
|
* way to resolve the ambiguity.
|
|
*/
|
|
unsigned long old_addr;
|
|
|
|
/* internal */
|
|
struct kobject kobj;
|
|
enum klp_state state;
|
|
struct list_head stack_node;
|
|
};
|
|
|
|
/**
|
|
* struct klp_reloc - relocation structure for live patching
|
|
* @loc: address where the relocation will be written
|
|
* @val: address of the referenced symbol (optional,
|
|
* vmlinux patches only)
|
|
* @type: ELF relocation type
|
|
* @name: name of the referenced symbol (for lookup/verification)
|
|
* @addend: offset from the referenced symbol
|
|
* @external: symbol is either exported or within the live patch module itself
|
|
*/
|
|
struct klp_reloc {
|
|
unsigned long loc;
|
|
unsigned long val;
|
|
unsigned long type;
|
|
const char *name;
|
|
int addend;
|
|
int external;
|
|
};
|
|
|
|
/**
|
|
* struct klp_object - kernel object structure for live patching
|
|
* @name: module name (or NULL for vmlinux)
|
|
* @relocs: relocation entries to be applied at load time
|
|
* @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_reloc *relocs;
|
|
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;
|
|
};
|
|
|
|
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 *);
|
|
|
|
#endif /* CONFIG_LIVEPATCH */
|
|
|
|
#endif /* _LINUX_LIVEPATCH_H_ */
|