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19514910d0
The address of the to be patched function and new function is stored
in struct klp_func as:
void *new_func;
unsigned long old_addr;
The different naming scheme and type are derived from the way
the addresses are set. @old_addr is assigned at runtime using
kallsyms-based search. @new_func is statically initialized,
for example:
static struct klp_func funcs[] = {
{
.old_name = "cmdline_proc_show",
.new_func = livepatch_cmdline_proc_show,
}, { }
};
This patch changes unsigned long old_addr -> void *old_func. It removes
some confusion when these address are later used in the code. It is
motivated by a followup patch that adds special NOP struct klp_func
where we want to assign func->new_func = func->old_addr respectively
func->new_func = func->old_func.
This patch does not modify the existing behavior.
Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Alice Ferrazzi <alice.ferrazzi@gmail.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LIVEPATCH_PATCH_H
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#define _LIVEPATCH_PATCH_H
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#include <linux/livepatch.h>
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#include <linux/list.h>
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#include <linux/ftrace.h>
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/**
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* struct klp_ops - structure for tracking registered ftrace ops structs
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*
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* A single ftrace_ops is shared between all enabled replacement functions
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* (klp_func structs) which have the same old_func. This allows the switch
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* between function versions to happen instantaneously by updating the klp_ops
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* struct's func_stack list. The winner is the klp_func at the top of the
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* func_stack (front of the list).
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*
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* @node: node for the global klp_ops list
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* @func_stack: list head for the stack of klp_func's (active func is on top)
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* @fops: registered ftrace ops struct
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*/
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struct klp_ops {
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struct list_head node;
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struct list_head func_stack;
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struct ftrace_ops fops;
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};
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struct klp_ops *klp_find_ops(void *old_func);
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int klp_patch_object(struct klp_object *obj);
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void klp_unpatch_object(struct klp_object *obj);
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void klp_unpatch_objects(struct klp_patch *patch);
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#endif /* _LIVEPATCH_PATCH_H */
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