Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
Pull livepatching updates from Jiri Kosina: - livepatching kselftests improvements from Joe Lawrence and Miroslav Benes - making use of gcc's -flive-patching option when available, from Miroslav Benes - kobject handling cleanups, from Petr Mladek * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching: livepatch: Remove duplicated code for early initialization livepatch: Remove custom kobject state handling livepatch: Convert error about unsupported reliable stacktrace into a warning selftests/livepatch: Add functions.sh to TEST_PROGS_EXTENDED kbuild: use -flive-patching when CONFIG_LIVEPATCH is enabled selftests/livepatch: use TEST_PROGS for test scripts
This commit is contained in:
Коммит
573de2a6e8
4
Makefile
4
Makefile
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@ -811,6 +811,10 @@ KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
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LDFLAGS_vmlinux += --gc-sections
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endif
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ifdef CONFIG_LIVEPATCH
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KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
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endif
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# arch Makefile may override CC so keep this after arch Makefile is included
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NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
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@ -86,7 +86,6 @@ struct klp_func {
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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 kobj_added;
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bool nop;
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bool patched;
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bool transition;
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@ -141,7 +140,6 @@ struct klp_object {
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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 kobj_added;
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bool dynamic;
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bool patched;
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};
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@ -170,7 +168,6 @@ struct klp_patch {
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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 kobj_added;
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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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@ -426,7 +426,13 @@ static void klp_free_object_dynamic(struct klp_object *obj)
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kfree(obj);
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}
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static struct klp_object *klp_alloc_object_dynamic(const char *name)
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static void klp_init_func_early(struct klp_object *obj,
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struct klp_func *func);
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static void klp_init_object_early(struct klp_patch *patch,
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struct klp_object *obj);
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static struct klp_object *klp_alloc_object_dynamic(const char *name,
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struct klp_patch *patch)
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{
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struct klp_object *obj;
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@ -442,7 +448,7 @@ static struct klp_object *klp_alloc_object_dynamic(const char *name)
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}
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}
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INIT_LIST_HEAD(&obj->func_list);
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klp_init_object_early(patch, obj);
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obj->dynamic = true;
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return obj;
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@ -471,6 +477,7 @@ static struct klp_func *klp_alloc_func_nop(struct klp_func *old_func,
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}
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}
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klp_init_func_early(obj, func);
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/*
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* func->new_func is same as func->old_func. These addresses are
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* set when the object is loaded, see klp_init_object_loaded().
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@ -490,11 +497,9 @@ static int klp_add_object_nops(struct klp_patch *patch,
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obj = klp_find_object(patch, old_obj);
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if (!obj) {
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obj = klp_alloc_object_dynamic(old_obj->name);
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obj = klp_alloc_object_dynamic(old_obj->name, patch);
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if (!obj)
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return -ENOMEM;
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list_add_tail(&obj->node, &patch->obj_list);
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}
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klp_for_each_func(old_obj, old_func) {
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@ -505,8 +510,6 @@ static int klp_add_object_nops(struct klp_patch *patch,
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func = klp_alloc_func_nop(old_func, obj);
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if (!func)
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return -ENOMEM;
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list_add_tail(&func->node, &obj->func_list);
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}
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return 0;
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@ -588,13 +591,7 @@ static void __klp_free_funcs(struct klp_object *obj, bool nops_only)
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continue;
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list_del(&func->node);
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/* Might be called from klp_init_patch() error path. */
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if (func->kobj_added) {
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kobject_put(&func->kobj);
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} else if (func->nop) {
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klp_free_func_nop(func);
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}
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kobject_put(&func->kobj);
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}
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}
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@ -624,13 +621,7 @@ static void __klp_free_objects(struct klp_patch *patch, bool nops_only)
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continue;
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list_del(&obj->node);
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/* Might be called from klp_init_patch() error path. */
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if (obj->kobj_added) {
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kobject_put(&obj->kobj);
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} else if (obj->dynamic) {
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klp_free_object_dynamic(obj);
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}
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kobject_put(&obj->kobj);
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}
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}
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@ -675,10 +666,8 @@ static void klp_free_patch_finish(struct klp_patch *patch)
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* this is called when the patch gets disabled and it
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* cannot get enabled again.
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*/
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if (patch->kobj_added) {
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kobject_put(&patch->kobj);
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wait_for_completion(&patch->finish);
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}
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kobject_put(&patch->kobj);
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wait_for_completion(&patch->finish);
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/* Put the module after the last access to struct klp_patch. */
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if (!patch->forced)
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@ -700,8 +689,6 @@ static void klp_free_patch_work_fn(struct work_struct *work)
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static int klp_init_func(struct klp_object *obj, struct klp_func *func)
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{
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int ret;
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if (!func->old_name)
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return -EINVAL;
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@ -724,13 +711,9 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func)
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* object. If the user selects 0 for old_sympos, then 1 will be used
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* since a unique symbol will be the first occurrence.
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*/
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ret = kobject_init_and_add(&func->kobj, &klp_ktype_func,
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&obj->kobj, "%s,%lu", func->old_name,
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func->old_sympos ? func->old_sympos : 1);
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if (!ret)
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func->kobj_added = true;
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return ret;
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return kobject_add(&func->kobj, &obj->kobj, "%s,%lu",
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func->old_name,
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func->old_sympos ? func->old_sympos : 1);
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}
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/* Arches may override this to finish any remaining arch-specific tasks */
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@ -801,11 +784,9 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
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klp_find_object_module(obj);
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name = klp_is_module(obj) ? obj->name : "vmlinux";
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ret = kobject_init_and_add(&obj->kobj, &klp_ktype_object,
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&patch->kobj, "%s", name);
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ret = kobject_add(&obj->kobj, &patch->kobj, "%s", name);
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if (ret)
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return ret;
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obj->kobj_added = true;
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klp_for_each_func(obj, func) {
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ret = klp_init_func(obj, func);
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@ -819,6 +800,21 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
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return ret;
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}
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static void klp_init_func_early(struct klp_object *obj,
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struct klp_func *func)
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{
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kobject_init(&func->kobj, &klp_ktype_func);
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list_add_tail(&func->node, &obj->func_list);
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}
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static void klp_init_object_early(struct klp_patch *patch,
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struct klp_object *obj)
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{
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INIT_LIST_HEAD(&obj->func_list);
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kobject_init(&obj->kobj, &klp_ktype_object);
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list_add_tail(&obj->node, &patch->obj_list);
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}
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static int klp_init_patch_early(struct klp_patch *patch)
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{
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struct klp_object *obj;
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@ -829,7 +825,7 @@ static int klp_init_patch_early(struct klp_patch *patch)
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INIT_LIST_HEAD(&patch->list);
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INIT_LIST_HEAD(&patch->obj_list);
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patch->kobj_added = false;
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kobject_init(&patch->kobj, &klp_ktype_patch);
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patch->enabled = false;
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patch->forced = false;
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INIT_WORK(&patch->free_work, klp_free_patch_work_fn);
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@ -839,13 +835,10 @@ static int klp_init_patch_early(struct klp_patch *patch)
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if (!obj->funcs)
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return -EINVAL;
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INIT_LIST_HEAD(&obj->func_list);
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obj->kobj_added = false;
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list_add_tail(&obj->node, &patch->obj_list);
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klp_init_object_early(patch, obj);
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klp_for_each_func_static(obj, func) {
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func->kobj_added = false;
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list_add_tail(&func->node, &obj->func_list);
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klp_init_func_early(obj, func);
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}
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}
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@ -860,11 +853,9 @@ static int klp_init_patch(struct klp_patch *patch)
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struct klp_object *obj;
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int ret;
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ret = kobject_init_and_add(&patch->kobj, &klp_ktype_patch,
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klp_root_kobj, "%s", patch->mod->name);
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ret = kobject_add(&patch->kobj, klp_root_kobj, "%s", patch->mod->name);
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if (ret)
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return ret;
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patch->kobj_added = true;
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if (patch->replace) {
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ret = klp_add_nops(patch);
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@ -926,9 +917,6 @@ static int __klp_enable_patch(struct klp_patch *patch)
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if (WARN_ON(patch->enabled))
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return -EINVAL;
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if (!patch->kobj_added)
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return -EINVAL;
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pr_notice("enabling patch '%s'\n", patch->mod->name);
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klp_init_transition(patch, KLP_PATCHED);
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@ -1003,11 +991,10 @@ int klp_enable_patch(struct klp_patch *patch)
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return -ENODEV;
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if (!klp_have_reliable_stack()) {
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pr_err("This architecture doesn't have support for the livepatch consistency model.\n");
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return -EOPNOTSUPP;
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pr_warn("This architecture doesn't have support for the livepatch consistency model.\n");
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pr_warn("The livepatch transition may never complete.\n");
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}
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mutex_lock(&klp_mutex);
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ret = klp_init_patch_early(patch);
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@ -1,6 +1,7 @@
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# SPDX-License-Identifier: GPL-2.0
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TEST_GEN_PROGS := \
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TEST_PROGS_EXTENDED := functions.sh
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TEST_PROGS := \
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test-livepatch.sh \
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test-callbacks.sh \
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test-shadow-vars.sh
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