mirror of
https://github.com/dynup/kpatch
synced 2025-01-05 20:49:26 +00:00
0bb5c106ef
Restructure kpatch's sysfs interface and mirror the sysfs tree after
livepatch's sysfs layout. With the current sysfs layout, we cannot
distinguish which object a function belongs to, and we cannot tell which
modules/objects are patched. Therefore, restructure the kpatch sysfs tree
such that module/object information is available. With the new layout, each
patched object has its own directory, with each function being a
subdirectory of its object.
Implement this by embedding a kobject struct within the kpatch_module,
kpatch_func, and kpatch_object structs and supplying their ktypes and
kobject release methods.
Before:
/sys/kernel/kpatch
└── patches
└── <patch_module>
├── checksum
├── enabled
└── functions
├── <function> # from <object1>
│ ├── new_addr
│ └── old_addr
├── <function> # from <object2>
│ ├── new_addr
│ └── old_addr
└─── <function> # from <object3>
├── new_addr
└── old_addr
After:
/sys/kernel/kpatch
└── <patch_module>
├── <object1>
│ └── <function,sympos>
│ ├── new_addr
│ └── old_addr
├── <object2>
│ └── <function,sympos>
│ ├── new_addr
│ └── old_addr
├── checksum
├── enabled
└── <object3>
└── <function,sympos>
├── new_addr
└── old_addr
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
/*
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* kpatch.h
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*
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* Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
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* Copyright (C) 2013-2014 Josh Poimboeuf <jpoimboe@redhat.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*
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* Contains the API for the core kpatch module used by the patch modules
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*/
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#ifndef _KPATCH_H_
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#define _KPATCH_H_
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#include <linux/types.h>
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#include <linux/module.h>
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enum kpatch_op {
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KPATCH_OP_NONE,
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KPATCH_OP_PATCH,
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KPATCH_OP_UNPATCH,
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};
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struct kpatch_func {
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/* public */
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unsigned long new_addr;
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unsigned long new_size;
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unsigned long old_addr;
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unsigned long old_size;
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unsigned long sympos;
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const char *name;
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struct list_head list;
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int force;
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/* private */
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struct hlist_node node;
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enum kpatch_op op;
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struct kobject kobj;
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};
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struct kpatch_dynrela {
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unsigned long dest;
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unsigned long src;
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unsigned long type;
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unsigned long sympos;
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const char *name;
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int addend;
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int external;
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struct list_head list;
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};
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struct kpatch_hook {
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struct list_head list;
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void (*hook)(void);
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};
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struct kpatch_object {
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struct list_head list;
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const char *name;
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struct list_head funcs;
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struct list_head dynrelas;
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struct list_head hooks_load;
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struct list_head hooks_unload;
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/* private */
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struct module *mod;
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struct kobject kobj;
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};
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struct kpatch_module {
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/* public */
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struct module *mod;
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struct list_head objects;
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/* public read-only */
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bool enabled;
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/* private */
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struct list_head list;
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struct kobject kobj;
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};
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extern struct kobject *kpatch_root_kobj;
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extern int kpatch_register(struct kpatch_module *kpmod, bool replace);
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extern int kpatch_unregister(struct kpatch_module *kpmod);
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extern void *kpatch_shadow_alloc(void *obj, char *var, size_t size, gfp_t gfp);
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extern void kpatch_shadow_free(void *obj, char *var);
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extern void *kpatch_shadow_get(void *obj, char *var);
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#endif /* _KPATCH_H_ */
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