live _I|Mjq؂File not found. !lY> Clq@o\e1h 95_David Carver (Digital Workstation Engineering/Project Athena) Mark Vojkovich (XFree86 Project) *l4( (  fB- y_I|+!$/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * livepatch.h - Kernel Live Patching Core * * Copyright (C) 2014 Seth Jennings * Copyright (C) 2014 SUSE */ #ifndef _LINUX_LIVEPATCH_H_ #define _LINUX_LIVEPATCH_H_ #include #include #include #include #include #if IS_ENABLED(CONFIG_LIVEPATCH) #include /* task patch states */ #define KLP_TRANSITION_IDLE -1 #define KLP_TRANSITION_UNPATCHED 0 #define KLP_TRANSITION_PATCHED 1 /** * 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_func: pointer to the function being patched * @kobj: kobject for sysfs resources * @node: list node for klp_object func_list * @stack_node: list node for klp_ops func_stack list * @old_size: size of the old function * @new_size: size of the new function * @nop: temporary patch to use the original code again; dyn. allocated * @patched: the func has been added to the klp_ops list * @transition: the func is currently being applied or reverted * * The patched and transition variables define the func's patching state. When * patching, a func is always in one of the following states: * * patched=0 transition=0: unpatched * patched=0 transition=1: unpatched, temporary starting state * patched=1 transition=1: patched, may be visible to some tasks * patched=1 transition=0: patched, visible to all tasks * * And when unpatching, it goes in the reverse order: * * patched=1 transition=0: patched, visible to all tasks * patched=1 transition=1: patched, may be visible to some tasks * patched=0 transition=1: unpatched, temporary ending state * patched=0 transition=0: unpatched */ 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 */ void *old_func; struct kobject kobj; struct list_head node; struct list_head stack_node; unsigned long old_size, new_size; bool nop; bool patched; bool transition; }; struct klp_object; /** * struct klp_callbacks - pre/post live-(un)patch callback structure * @pre_patch: executed before code patching * @post_patch: executed after code patching * @pre_unpatch: executed before code unpatching * @post_unpatch: executed after code unpatching * @post_unpatch_enabled: flag indicating if post-unpatch callback * should run * * All callbacks are optional. Only the pre-patch callback, if provided, * will be unconditionally executed. If the parent klp_object fails to * patch for any reason, including a non-zero error status returned from * the pre-patch callback, no further callbacks will be executed. */ struct klp_callbacks { int (*pre_patch)(struct klp_object *obj); void (*post_patch)(struct klp_object *obj); void (*pre_unpatch)(struct klp_object *obj); void (*post_unpatch)(struct klp_object *obj); bool post_unpatch_enabled; }; /** * 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 * @callbacks: functions to be executed pre/post (un)patching * @kobj: kobject for sysfs resources * @func_list: dynamic list of the function ent