disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/livepatch.h
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@@ -1,21 +1,9 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * livepatch.h - Kernel Live Patching Core
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  *
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  * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
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  * Copyright (C) 2014 SUSE
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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 <http://www.gnu.org/licenses/>.
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  */
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 #ifndef _LINUX_LIVEPATCH_H_
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@@ -24,6 +12,7 @@
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 #include <linux/module.h>
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 #include <linux/ftrace.h>
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 #include <linux/completion.h>
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+#include <linux/list.h>
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 #if IS_ENABLED(CONFIG_LIVEPATCH)
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@@ -40,11 +29,13 @@
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  * @new_func:	pointer to the patched function code
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  * @old_sympos: a hint indicating which symbol position the old function
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  *		can be found (optional)
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- * @old_addr:	the address of the function being patched
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+ * @old_func:	pointer to the function being patched
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  * @kobj:	kobject for sysfs resources
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+ * @node:	list node for klp_object func_list
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  * @stack_node:	list node for klp_ops func_stack list
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  * @old_size:	size of the old function
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  * @new_size:	size of the new function
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+ * @nop:        temporary patch to use the original code again; dyn. allocated
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  * @patched:	the func has been added to the klp_ops list
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  * @transition:	the func is currently being applied or reverted
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  *
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@@ -77,10 +68,12 @@
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 	unsigned long old_sympos;
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 	/* internal */
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-	unsigned long old_addr;
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+	void *old_func;
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 	struct kobject kobj;
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+	struct list_head node;
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 	struct list_head stack_node;
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 	unsigned long old_size, new_size;
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+	bool nop;
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 	bool patched;
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 	bool transition;
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 };
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@@ -115,8 +108,11 @@
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  * @funcs:	function entries for functions to be patched in the object
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  * @callbacks:	functions to be executed pre/post (un)patching
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  * @kobj:	kobject for sysfs resources
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+ * @func_list:	dynamic list of the function entries
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+ * @node:	list node for klp_patch obj_list
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  * @mod:	kernel module associated with the patched object
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  *		(NULL for vmlinux)
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+ * @dynamic:    temporary object for nop functions; dynamically allocated
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  * @patched:	the object's funcs have been added to the klp_ops list
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  */
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 struct klp_object {
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@@ -127,46 +123,77 @@
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 	/* internal */
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 	struct kobject kobj;
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+	struct list_head func_list;
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+	struct list_head node;
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 	struct module *mod;
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+	bool dynamic;
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 	bool patched;
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+};
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+
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+/**
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+ * struct klp_state - state of the system modified by the livepatch
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+ * @id:		system state identifier (non-zero)
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+ * @version:	version of the change
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+ * @data:	custom data
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+ */
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+struct klp_state {
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+	unsigned long id;
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+	unsigned int version;
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+	void *data;
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 };
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 /**
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  * struct klp_patch - patch structure for live patching
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  * @mod:	reference to the live patch module
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  * @objs:	object entries for kernel objects to be patched
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- * @list:	list node for global list of registered patches
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+ * @states:	system states that can get modified
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+ * @replace:	replace all actively used patches
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+ * @list:	list node for global list of actively used patches
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  * @kobj:	kobject for sysfs resources
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+ * @obj_list:	dynamic list of the object entries
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  * @enabled:	the patch is enabled (but operation may be incomplete)
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+ * @forced:	was involved in a forced transition
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+ * @free_work:	patch cleanup from workqueue-context
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  * @finish:	for waiting till it is safe to remove the patch module
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  */
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 struct klp_patch {
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 	/* external */
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 	struct module *mod;
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 	struct klp_object *objs;
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+	struct klp_state *states;
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+	bool replace;
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 	/* internal */
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 	struct list_head list;
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 	struct kobject kobj;
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+	struct list_head obj_list;
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 	bool enabled;
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+	bool forced;
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+	struct work_struct free_work;
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 	struct completion finish;
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 };
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-#define klp_for_each_object(patch, obj) \
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+#define klp_for_each_object_static(patch, obj) \
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 	for (obj = patch->objs; obj->funcs || obj->name; obj++)
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-#define klp_for_each_func(obj, func) \
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+#define klp_for_each_object_safe(patch, obj, tmp_obj)		\
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+	list_for_each_entry_safe(obj, tmp_obj, &patch->obj_list, node)
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+
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+#define klp_for_each_object(patch, obj)	\
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+	list_for_each_entry(obj, &patch->obj_list, node)
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+
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+#define klp_for_each_func_static(obj, func) \
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 	for (func = obj->funcs; \
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 	     func->old_name || func->new_func || func->old_sympos; \
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 	     func++)
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-int klp_register_patch(struct klp_patch *);
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-int klp_unregister_patch(struct klp_patch *);
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-int klp_enable_patch(struct klp_patch *);
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-int klp_disable_patch(struct klp_patch *);
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+#define klp_for_each_func_safe(obj, func, tmp_func)			\
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+	list_for_each_entry_safe(func, tmp_func, &obj->func_list, node)
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-void arch_klp_init_object_loaded(struct klp_patch *patch,
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-				 struct klp_object *obj);
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+#define klp_for_each_func(obj, func)	\
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+	list_for_each_entry(func, &obj->func_list, node)
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+
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+int klp_enable_patch(struct klp_patch *);
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 /* Called from the module loader during module coming/going states */
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 int klp_module_coming(struct module *mod);
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@@ -201,6 +228,14 @@
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 void klp_shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor);
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 void klp_shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor);
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+struct klp_state *klp_get_state(struct klp_patch *patch, unsigned long id);
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+struct klp_state *klp_get_prev_state(unsigned long id);
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+
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+int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs,
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+			     const char *shstrtab, const char *strtab,
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+			     unsigned int symindex, unsigned int secindex,
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+			     const char *objname);
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+
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 #else /* !CONFIG_LIVEPATCH */
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 static inline int klp_module_coming(struct module *mod) { return 0; }
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@@ -209,6 +244,15 @@
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 static inline void klp_update_patch_state(struct task_struct *task) {}
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 static inline void klp_copy_process(struct task_struct *child) {}
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+static inline
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+int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs,
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+			     const char *shstrtab, const char *strtab,
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+			     unsigned int symindex, unsigned int secindex,
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+			     const char *objname)
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+{
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+	return 0;
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+}
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+
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 #endif /* CONFIG_LIVEPATCH */
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 #endif /* _LINUX_LIVEPATCH_H_ */