mirror of
https://github.com/dynup/kpatch
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2e93c5e1e3
Some functions in the kernel are always on the stack of some thread in the system. Attempts to patch these function will currently always fail the activeness safety check. However, through human inspection, it can be determined that, for a particular function, consistency is maintained even if the old and new versions of the function run concurrently. This commit introduces a KPATCH_FORCE_UNSAFE() macro to define patched functions that such be exempted from the activeness safety check. Signed-off-by: Seth Jennings <sjenning@redhat.com>
96 lines
2.1 KiB
C
96 lines
2.1 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_offset;
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unsigned long old_size;
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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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unsigned long old_addr;
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enum kpatch_op op;
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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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const char *name;
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int addend;
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int exported;
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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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};
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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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};
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extern struct kobject *kpatch_patches_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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#endif /* _KPATCH_H_ */
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