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authorJason Baron <jbaron@akamai.com>2019-01-09 13:43:24 +0100
committerJiri Kosina <jkosina@suse.cz>2019-01-11 20:51:24 +0100
commit20e55025958e18e671d92c7adea00c301ac93c43 (patch)
tree3c2a116fee563aa31fd637a34d28fb6254885568 /include/linux/livepatch.h
parent958ef1e39d24d6cb8bf2a7406130a98c9564230f (diff)
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livepatch: Use lists to manage patches, objects and functions
Currently klp_patch contains a pointer to a statically allocated array of struct klp_object and struct klp_objects contains a pointer to a statically allocated array of klp_func. In order to allow for the dynamic allocation of objects and functions, link klp_patch, klp_object, and klp_func together via linked lists. This allows us to more easily allocate new objects and functions, while having the iterator be a simple linked list walk. The static structures are added to the lists early. It allows to add the dynamically allocated objects before klp_init_object() and klp_init_func() calls. Therefore it reduces the further changes to the code. This patch does not change the existing behavior. Signed-off-by: Jason Baron <jbaron@akamai.com> [pmladek@suse.com: Initialize lists before init calls] Signed-off-by: Petr Mladek <pmladek@suse.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Acked-by: Joe Lawrence <joe.lawrence@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Jiri Kosina <jikos@kernel.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'include/linux/livepatch.h')
-rw-r--r--include/linux/livepatch.h19
1 files changed, 17 insertions, 2 deletions
diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index 8f9c19c69744..e117e20ff771 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -24,6 +24,7 @@
#include <linux/module.h>
#include <linux/ftrace.h>
#include <linux/completion.h>
+#include <linux/list.h>
#if IS_ENABLED(CONFIG_LIVEPATCH)
@@ -42,6 +43,7 @@
* 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
@@ -80,6 +82,7 @@ struct klp_func {
/* internal */
void *old_func;
struct kobject kobj;
+ struct list_head node;
struct list_head stack_node;
unsigned long old_size, new_size;
bool kobj_added;
@@ -117,6 +120,8 @@ struct klp_callbacks {
* @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 entries
+ * @node: list node for klp_patch obj_list
* @mod: kernel module associated with the patched object
* (NULL for vmlinux)
* @kobj_added: @kobj has been added and needs freeing
@@ -130,6 +135,8 @@ struct klp_object {
/* internal */
struct kobject kobj;
+ struct list_head func_list;
+ struct list_head node;
struct module *mod;
bool kobj_added;
bool patched;
@@ -141,6 +148,7 @@ struct klp_object {
* @objs: object entries for kernel objects to be patched
* @list: list node for global list of actively used patches
* @kobj: kobject for sysfs resources
+ * @obj_list: dynamic list of the object entries
* @kobj_added: @kobj has been added and needs freeing
* @enabled: the patch is enabled (but operation may be incomplete)
* @forced: was involved in a forced transition
@@ -155,6 +163,7 @@ struct klp_patch {
/* internal */
struct list_head list;
struct kobject kobj;
+ struct list_head obj_list;
bool kobj_added;
bool enabled;
bool forced;
@@ -162,14 +171,20 @@ struct klp_patch {
struct completion finish;
};
-#define klp_for_each_object(patch, obj) \
+#define klp_for_each_object_static(patch, obj) \
for (obj = patch->objs; obj->funcs || obj->name; obj++)
-#define klp_for_each_func(obj, func) \
+#define klp_for_each_object(patch, obj) \
+ list_for_each_entry(obj, &patch->obj_list, node)
+
+#define klp_for_each_func_static(obj, func) \
for (func = obj->funcs; \
func->old_name || func->new_func || func->old_sympos; \
func++)
+#define klp_for_each_func(obj, func) \
+ list_for_each_entry(func, &obj->func_list, node)
+
int klp_enable_patch(struct klp_patch *);
void arch_klp_init_object_loaded(struct klp_patch *patch,