Lines Matching full:patch
25 #include "patch.h"
71 * Note that the patch might still be needed before klp_module_going() in klp_find_object_module()
102 static struct klp_object *klp_find_object(struct klp_patch *patch, in klp_find_object() argument
107 klp_for_each_object(patch, obj) { in klp_find_object()
345 * /sys/kernel/livepatch/<patch>
346 * /sys/kernel/livepatch/<patch>/enabled
347 * /sys/kernel/livepatch/<patch>/transition
348 * /sys/kernel/livepatch/<patch>/force
349 * /sys/kernel/livepatch/<patch>/<object>
350 * /sys/kernel/livepatch/<patch>/<object>/patched
351 * /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
353 static int __klp_disable_patch(struct klp_patch *patch);
358 struct klp_patch *patch; in enabled_store() local
366 patch = container_of(kobj, struct klp_patch, kobj); in enabled_store()
370 if (patch->enabled == enabled) { in enabled_store()
381 * Do not allow to re-enable a disabled patch. in enabled_store()
383 if (patch == klp_transition_patch) in enabled_store()
386 ret = __klp_disable_patch(patch); in enabled_store()
401 struct klp_patch *patch; in enabled_show() local
403 patch = container_of(kobj, struct klp_patch, kobj); in enabled_show()
404 return snprintf(buf, PAGE_SIZE-1, "%d\n", patch->enabled); in enabled_show()
410 struct klp_patch *patch; in transition_show() local
412 patch = container_of(kobj, struct klp_patch, kobj); in transition_show()
414 patch == klp_transition_patch); in transition_show()
420 struct klp_patch *patch; in force_store() local
433 patch = container_of(kobj, struct klp_patch, kobj); in force_store()
434 if (patch != klp_transition_patch) { in force_store()
481 static void klp_init_object_early(struct klp_patch *patch,
485 struct klp_patch *patch) in klp_alloc_object_dynamic() argument
501 klp_init_object_early(patch, obj); in klp_alloc_object_dynamic()
541 static int klp_add_object_nops(struct klp_patch *patch, in klp_add_object_nops() argument
547 obj = klp_find_object(patch, old_obj); in klp_add_object_nops()
550 obj = klp_alloc_object_dynamic(old_obj->name, patch); in klp_add_object_nops()
571 * patch to facilitate a 'replace' mode.
573 static int klp_add_nops(struct klp_patch *patch) in klp_add_nops() argument
582 err = klp_add_object_nops(patch, old_obj); in klp_add_nops()
593 struct klp_patch *patch; in klp_kobj_release_patch() local
595 patch = container_of(kobj, struct klp_patch, kobj); in klp_kobj_release_patch()
596 complete(&patch->finish); in klp_kobj_release_patch()
664 static void __klp_free_objects(struct klp_patch *patch, bool nops_only) in __klp_free_objects() argument
668 klp_for_each_object_safe(patch, obj, tmp_obj) { in __klp_free_objects()
679 static void klp_free_objects(struct klp_patch *patch) in klp_free_objects() argument
681 __klp_free_objects(patch, false); in klp_free_objects()
684 static void klp_free_objects_dynamic(struct klp_patch *patch) in klp_free_objects_dynamic() argument
686 __klp_free_objects(patch, true); in klp_free_objects_dynamic()
696 static void klp_free_patch_start(struct klp_patch *patch) in klp_free_patch_start() argument
698 if (!list_empty(&patch->list)) in klp_free_patch_start()
699 list_del(&patch->list); in klp_free_patch_start()
701 klp_free_objects(patch); in klp_free_patch_start()
709 * the last function accessing the livepatch structures when the patch
712 static void klp_free_patch_finish(struct klp_patch *patch) in klp_free_patch_finish() argument
717 * this is called when the patch gets disabled and it in klp_free_patch_finish()
720 kobject_put(&patch->kobj); in klp_free_patch_finish()
721 wait_for_completion(&patch->finish); in klp_free_patch_finish()
724 if (!patch->forced) in klp_free_patch_finish()
725 module_put(patch->mod); in klp_free_patch_finish()
729 * The livepatch might be freed from sysfs interface created by the patch.
735 struct klp_patch *patch = in klp_free_patch_work_fn() local
738 klp_free_patch_finish(patch); in klp_free_patch_work_fn()
741 void klp_free_patch_async(struct klp_patch *patch) in klp_free_patch_async() argument
743 klp_free_patch_start(patch); in klp_free_patch_async()
744 schedule_work(&patch->free_work); in klp_free_patch_async()
787 static int klp_write_object_relocs(struct klp_patch *patch, in klp_write_object_relocs() argument
792 struct klp_modinfo *info = patch->mod->klp_info; in klp_write_object_relocs()
800 ret = klp_write_section_relocs(patch->mod, info->sechdrs, in klp_write_object_relocs()
802 patch->mod->core_kallsyms.strtab, in klp_write_object_relocs()
811 static int klp_apply_object_relocs(struct klp_patch *patch, in klp_apply_object_relocs() argument
814 return klp_write_object_relocs(patch, obj, true); in klp_apply_object_relocs()
817 static void klp_clear_object_relocs(struct klp_patch *patch, in klp_clear_object_relocs() argument
820 klp_write_object_relocs(patch, obj, false); in klp_clear_object_relocs()
824 static int klp_init_object_loaded(struct klp_patch *patch, in klp_init_object_loaded() argument
837 ret = klp_apply_object_relocs(patch, obj); in klp_init_object_loaded()
872 static int klp_init_object(struct klp_patch *patch, struct klp_object *obj) in klp_init_object() argument
887 ret = kobject_add(&obj->kobj, &patch->kobj, "%s", name); in klp_init_object()
898 ret = klp_init_object_loaded(patch, obj); in klp_init_object()
910 static void klp_init_object_early(struct klp_patch *patch, in klp_init_object_early() argument
915 list_add_tail(&obj->node, &patch->obj_list); in klp_init_object_early()
918 static void klp_init_patch_early(struct klp_patch *patch) in klp_init_patch_early() argument
923 INIT_LIST_HEAD(&patch->list); in klp_init_patch_early()
924 INIT_LIST_HEAD(&patch->obj_list); in klp_init_patch_early()
925 kobject_init(&patch->kobj, &klp_ktype_patch); in klp_init_patch_early()
926 patch->enabled = false; in klp_init_patch_early()
927 patch->forced = false; in klp_init_patch_early()
928 INIT_WORK(&patch->free_work, klp_free_patch_work_fn); in klp_init_patch_early()
929 init_completion(&patch->finish); in klp_init_patch_early()
931 klp_for_each_object_static(patch, obj) { in klp_init_patch_early()
932 klp_init_object_early(patch, obj); in klp_init_patch_early()
940 static int klp_init_patch(struct klp_patch *patch) in klp_init_patch() argument
945 ret = kobject_add(&patch->kobj, klp_root_kobj, "%s", patch->mod->name); in klp_init_patch()
949 if (patch->replace) { in klp_init_patch()
950 ret = klp_add_nops(patch); in klp_init_patch()
955 klp_for_each_object(patch, obj) { in klp_init_patch()
956 ret = klp_init_object(patch, obj); in klp_init_patch()
961 list_add_tail(&patch->list, &klp_patches); in klp_init_patch()
966 static int __klp_disable_patch(struct klp_patch *patch) in __klp_disable_patch() argument
970 if (WARN_ON(!patch->enabled)) in __klp_disable_patch()
976 klp_init_transition(patch, KLP_UNPATCHED); in __klp_disable_patch()
978 klp_for_each_object(patch, obj) in __klp_disable_patch()
992 patch->enabled = false; in __klp_disable_patch()
998 static int __klp_enable_patch(struct klp_patch *patch) in __klp_enable_patch() argument
1006 if (WARN_ON(patch->enabled)) in __klp_enable_patch()
1009 pr_notice("enabling patch '%s'\n", patch->mod->name); in __klp_enable_patch()
1011 klp_init_transition(patch, KLP_PATCHED); in __klp_enable_patch()
1022 klp_for_each_object(patch, obj) { in __klp_enable_patch()
1028 pr_warn("pre-patch callback failed for object '%s'\n", in __klp_enable_patch()
1035 pr_warn("failed to patch object '%s'\n", in __klp_enable_patch()
1042 patch->enabled = true; in __klp_enable_patch()
1047 pr_warn("failed to enable patch '%s'\n", patch->mod->name); in __klp_enable_patch()
1055 * @patch: patch to be enabled
1057 * Initializes the data structure associated with the patch, creates the sysfs
1066 int klp_enable_patch(struct klp_patch *patch) in klp_enable_patch() argument
1071 if (!patch || !patch->mod || !patch->objs) in klp_enable_patch()
1074 klp_for_each_object_static(patch, obj) { in klp_enable_patch()
1080 if (!is_livepatch_module(patch->mod)) { in klp_enable_patch()
1082 patch->mod->name); in klp_enable_patch()
1096 if (!klp_is_patch_compatible(patch)) { in klp_enable_patch()
1097 pr_err("Livepatch patch (%s) is not compatible with the already installed livepatches.\n", in klp_enable_patch()
1098 patch->mod->name); in klp_enable_patch()
1103 if (!try_module_get(patch->mod)) { in klp_enable_patch()
1108 klp_init_patch_early(patch); in klp_enable_patch()
1110 ret = klp_init_patch(patch); in klp_enable_patch()
1114 ret = __klp_enable_patch(patch); in klp_enable_patch()
1123 klp_free_patch_start(patch); in klp_enable_patch()
1127 klp_free_patch_finish(patch); in klp_enable_patch()
1143 * klp_ftrace_handler() might still see the replaced patch on the stack.
1146 * this is handled transparently by patch->module_put.
1191 struct klp_patch *patch; in klp_cleanup_module_patches_limited() local
1194 klp_for_each_patch(patch) { in klp_cleanup_module_patches_limited()
1195 if (patch == limit) in klp_cleanup_module_patches_limited()
1198 klp_for_each_object(patch, obj) { in klp_cleanup_module_patches_limited()
1202 if (patch != klp_transition_patch) in klp_cleanup_module_patches_limited()
1205 pr_notice("reverting patch '%s' on unloading module '%s'\n", in klp_cleanup_module_patches_limited()
1206 patch->mod->name, obj->mod->name); in klp_cleanup_module_patches_limited()
1210 klp_clear_object_relocs(patch, obj); in klp_cleanup_module_patches_limited()
1220 struct klp_patch *patch; in klp_module_coming() local
1235 * get patched by a new patch. in klp_module_coming()
1239 klp_for_each_patch(patch) { in klp_module_coming()
1240 klp_for_each_object(patch, obj) { in klp_module_coming()
1246 ret = klp_init_object_loaded(patch, obj); in klp_module_coming()
1248 pr_warn("failed to initialize patch '%s' for module '%s' (%d)\n", in klp_module_coming()
1249 patch->mod->name, obj->mod->name, ret); in klp_module_coming()
1253 pr_notice("applying patch '%s' to loading module '%s'\n", in klp_module_coming()
1254 patch->mod->name, obj->mod->name); in klp_module_coming()
1258 pr_warn("pre-patch callback failed for object '%s'\n", in klp_module_coming()
1265 pr_warn("failed to apply patch '%s' to module '%s' (%d)\n", in klp_module_coming()
1266 patch->mod->name, obj->mod->name, ret); in klp_module_coming()
1272 if (patch != klp_transition_patch) in klp_module_coming()
1285 * If a patch is unsuccessfully applied, return in klp_module_coming()
1288 pr_warn("patch '%s' failed for module '%s', refusing to load module '%s'\n", in klp_module_coming()
1289 patch->mod->name, obj->mod->name, obj->mod->name); in klp_module_coming()
1292 klp_cleanup_module_patches_limited(mod, patch); in klp_module_coming()
1308 * get patched by a new patch. in klp_module_going()