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/*
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* Copyright (C) 2013-2014 Josh Poimboeuf <jpoimboe@redhat.com>
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA,
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* 02110-1301, USA.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/kallsyms.h>
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#include "kpatch.h"
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#include "kpatch-patch.h"
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static bool replace;
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module_param(replace, bool, S_IRUGO);
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MODULE_PARM_DESC(replace, "replace all previously loaded patch modules");
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extern struct kpatch_patch_func __kpatch_funcs[], __kpatch_funcs_end[];
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extern struct kpatch_patch_dynrela __kpatch_dynrelas[], __kpatch_dynrelas_end[];
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extern struct kpatch_pre_patch_callback __kpatch_callbacks_pre_patch[], __kpatch_callbacks_pre_patch_end[];
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extern struct kpatch_post_patch_callback __kpatch_callbacks_post_patch[], __kpatch_callbacks_post_patch_end[];
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extern struct kpatch_pre_unpatch_callback __kpatch_callbacks_pre_unpatch[], __kpatch_callbacks_pre_unpatch_end[];
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extern struct kpatch_post_unpatch_callback __kpatch_callbacks_post_unpatch[], __kpatch_callbacks_post_unpatch_end[];
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extern unsigned long __kpatch_force_funcs[], __kpatch_force_funcs_end[];
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extern char __kpatch_checksum[];
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static struct kpatch_module kpmod;
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static ssize_t patch_enabled_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", kpmod.enabled);
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}
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static ssize_t patch_enabled_store(struct kobject *kobj,
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struct kobj_attribute *attr, const char *buf,
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size_t count)
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{
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int ret;
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unsigned long val;
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ret = kstrtoul(buf, 10, &val;;
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if (ret)
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return ret;
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val = !!val;
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if (val)
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ret = kpatch_register(&kpmod, replace);
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else
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ret = kpatch_unregister(&kpmod);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t patch_checksum_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%s\n", __kpatch_checksum);
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}
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static struct kobj_attribute patch_enabled_attr =
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__ATTR(enabled, 0644, patch_enabled_show, patch_enabled_store);
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static struct kobj_attribute patch_checksum_attr =
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__ATTR(checksum, 0444, patch_checksum_show, NULL);
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static struct attribute *patch_attrs[] = {
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&patch_enabled_attr.attr,
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&patch_checksum_attr.attr,
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NULL,
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};
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static void patch_kobj_free(struct kobject *kobj)
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{
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}
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static struct kobj_type patch_ktype = {
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.release = patch_kobj_free,
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.sysfs_ops = &kobj_sysfs_ops,
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.default_attrs = patch_attrs,
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};
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static ssize_t patch_func_old_addr_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct kpatch_func *func =
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container_of(kobj, struct kpatch_func, kobj);
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return sprintf(buf, "0x%lx\n", func->old_addr);
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}
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static ssize_t patch_func_new_addr_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct kpatch_func *func =
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container_of(kobj, struct kpatch_func, kobj);
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return sprintf(buf, "0x%lx\n", func->new_addr);
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}
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static struct kobj_attribute patch_old_addr_attr =
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__ATTR(old_addr, S_IRUSR, patch_func_old_addr_show, NULL);
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static struct kobj_attribute patch_new_addr_attr =
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__ATTR(new_addr, S_IRUSR, patch_func_new_addr_show, NULL);
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static struct attribute *patch_func_kobj_attrs[] = {
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&patch_old_addr_attr.attr,
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&patch_new_addr_attr.attr,
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NULL,
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};
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static ssize_t patch_func_kobj_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct kobj_attribute *func_attr =
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container_of(attr, struct kobj_attribute, attr);
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return func_attr->show(kobj, func_attr, buf);
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}
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static const struct sysfs_ops patch_func_sysfs_ops = {
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.show = patch_func_kobj_show,
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};
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static void patch_func_kobj_free(struct kobject *kobj)
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{
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struct kpatch_func *func =
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container_of(kobj, struct kpatch_func, kobj);
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kfree(func);
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}
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static struct kobj_type patch_func_ktype = {
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.release = patch_func_kobj_free,
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.sysfs_ops = &patch_func_sysfs_ops,
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.default_attrs = patch_func_kobj_attrs,
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};
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static void patch_object_kobj_free(struct kobject *kobj)
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{
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struct kpatch_object *obj =
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container_of(kobj, struct kpatch_object, kobj);
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kfree(obj);
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}
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static struct kobj_type patch_object_ktype = {
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.release = patch_object_kobj_free,
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.sysfs_ops = &kobj_sysfs_ops,
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};
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static struct kpatch_object *patch_find_or_add_object(struct list_head *head,
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const char *name)
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{
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struct kpatch_object *object;
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int ret;
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list_for_each_entry(object, head, list) {
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if (!strcmp(object->name, name))
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return object;
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}
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object = kzalloc(sizeof(*object), GFP_KERNEL);
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if (!object)
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return NULL;
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object->name = name;
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INIT_LIST_HEAD(&object->funcs);
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INIT_LIST_HEAD(&object->dynrelas);
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list_add_tail(&object->list, head);
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ret = kobject_init_and_add(&object->kobj, &patch_object_ktype,
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&kpmod.kobj, "%s", object->name);
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if (ret) {
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list_del(&object->list);
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kfree(object);
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return NULL;
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}
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return object;
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}
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static void patch_free_objects(void)
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{
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struct kpatch_object *object, *object_safe;
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struct kpatch_func *func, *func_safe;
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struct kpatch_dynrela *dynrela, *dynrela_safe;
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list_for_each_entry_safe(object, object_safe, &kpmod.objects, list) {
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list_for_each_entry_safe(func, func_safe, &object->funcs,
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list) {
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list_del(&func->list);
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kobject_put(&func->kobj);
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}
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list_for_each_entry_safe(dynrela, dynrela_safe,
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&object->dynrelas, list) {
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list_del(&dynrela->list);
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kfree(dynrela);
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}
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list_del(&object->list);
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kobject_put(&object->kobj);
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}
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}
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static int patch_is_func_forced(unsigned long addr)
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{
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unsigned long *a;
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for (a = __kpatch_force_funcs; a < __kpatch_force_funcs_end; a++)
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if (*a == addr)
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return 1;
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return 0;
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}
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static int patch_make_funcs_list(struct list_head *objects)
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{
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struct kpatch_object *object;
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struct kpatch_patch_func *p_func;
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struct kpatch_func *func;
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int ret;
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for (p_func = __kpatch_funcs; p_func < __kpatch_funcs_end; p_func++) {
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object = patch_find_or_add_object(&kpmod.objects,
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p_func->objname);
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if (!object)
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return -ENOMEM;
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func = kzalloc(sizeof(*func), GFP_KERNEL);
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if (!func)
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return -ENOMEM;
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func->new_addr = p_func->new_addr;
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func->new_size = p_func->new_size;
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func->old_size = p_func->old_size;
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func->sympos = p_func->sympos;
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func->name = p_func->name;
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func->force = patch_is_func_forced(func->new_addr);
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list_add_tail(&func->list, &object->funcs);
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ret = kobject_init_and_add(&func->kobj, &patch_func_ktype,
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&object->kobj, "%s,%lu",
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func->name, func->sympos ? func->sympos : 1);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int patch_make_dynrelas_list(struct list_head *objects)
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{
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struct kpatch_object *object;
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struct kpatch_patch_dynrela *p_dynrela;
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struct kpatch_dynrela *dynrela;
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for (p_dynrela = __kpatch_dynrelas; p_dynrela < __kpatch_dynrelas_end;
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p_dynrela++) {
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object = patch_find_or_add_object(objects, p_dynrela->objname);
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if (!object)
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return -ENOMEM;
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dynrela = kzalloc(sizeof(*dynrela), GFP_KERNEL);
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if (!dynrela)
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ac8aad |
return -ENOMEM;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
dynrela->dest = p_dynrela->dest;
|
|
Packit Service |
ac8aad |
dynrela->type = p_dynrela->type;
|
|
Packit Service |
ac8aad |
dynrela->sympos = p_dynrela->sympos;
|
|
Packit Service |
ac8aad |
dynrela->name = p_dynrela->name;
|
|
Packit Service |
ac8aad |
dynrela->external = p_dynrela->external;
|
|
Packit Service |
ac8aad |
dynrela->addend = p_dynrela->addend;
|
|
Packit Service |
ac8aad |
list_add_tail(&dynrela->list, &object->dynrelas);
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
return 0;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
static int patch_set_callbacks(struct list_head *objects)
|
|
Packit Service |
ac8aad |
{
|
|
Packit Service |
ac8aad |
struct kpatch_pre_patch_callback *p_pre_patch_callback;
|
|
Packit Service |
ac8aad |
struct kpatch_post_patch_callback *p_post_patch_callback;
|
|
Packit Service |
ac8aad |
struct kpatch_pre_unpatch_callback *p_pre_unpatch_callback;
|
|
Packit Service |
ac8aad |
struct kpatch_post_unpatch_callback *p_post_unpatch_callback;
|
|
Packit Service |
ac8aad |
struct kpatch_object *object;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
for (p_pre_patch_callback = __kpatch_callbacks_pre_patch;
|
|
Packit Service |
ac8aad |
p_pre_patch_callback < __kpatch_callbacks_pre_patch_end;
|
|
Packit Service |
ac8aad |
p_pre_patch_callback++) {
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
object = patch_find_or_add_object(objects, p_pre_patch_callback->objname);
|
|
Packit Service |
ac8aad |
if (!object)
|
|
Packit Service |
ac8aad |
return -ENOMEM;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
if (object->pre_patch_callback) {
|
|
Packit Service |
ac8aad |
pr_err("extra pre-patch callback for object: %s\n",
|
|
Packit Service |
ac8aad |
object->name);
|
|
Packit Service |
ac8aad |
return -EINVAL;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
object->pre_patch_callback =
|
|
Packit Service |
ac8aad |
(int (*)(struct kpatch_object *)) p_pre_patch_callback->callback;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
for (p_post_patch_callback = __kpatch_callbacks_post_patch;
|
|
Packit Service |
ac8aad |
p_post_patch_callback < __kpatch_callbacks_post_patch_end;
|
|
Packit Service |
ac8aad |
p_post_patch_callback++) {
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
object = patch_find_or_add_object(objects, p_post_patch_callback->objname);
|
|
Packit Service |
ac8aad |
if (!object)
|
|
Packit Service |
ac8aad |
return -ENOMEM;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
if (object->post_patch_callback) {
|
|
Packit Service |
ac8aad |
pr_err("extra post-patch callback for object: %s\n",
|
|
Packit Service |
ac8aad |
object->name);
|
|
Packit Service |
ac8aad |
return -EINVAL;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
object->post_patch_callback =
|
|
Packit Service |
ac8aad |
(void (*)(struct kpatch_object *)) p_post_patch_callback->callback;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
for (p_pre_unpatch_callback = __kpatch_callbacks_pre_unpatch;
|
|
Packit Service |
ac8aad |
p_pre_unpatch_callback < __kpatch_callbacks_pre_unpatch_end;
|
|
Packit Service |
ac8aad |
p_pre_unpatch_callback++) {
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
object = patch_find_or_add_object(objects, p_pre_unpatch_callback->objname);
|
|
Packit Service |
ac8aad |
if (!object)
|
|
Packit Service |
ac8aad |
return -ENOMEM;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
if (object->pre_unpatch_callback) {
|
|
Packit Service |
ac8aad |
pr_err("extra pre-unpatch callback for object: %s\n",
|
|
Packit Service |
ac8aad |
object->name);
|
|
Packit Service |
ac8aad |
return -EINVAL;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
object->pre_unpatch_callback =
|
|
Packit Service |
ac8aad |
(void (*)(struct kpatch_object *)) p_pre_unpatch_callback->callback;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
for (p_post_unpatch_callback = __kpatch_callbacks_post_unpatch;
|
|
Packit Service |
ac8aad |
p_post_unpatch_callback < __kpatch_callbacks_post_unpatch_end;
|
|
Packit Service |
ac8aad |
p_post_unpatch_callback++) {
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
object = patch_find_or_add_object(objects, p_post_unpatch_callback->objname);
|
|
Packit Service |
ac8aad |
if (!object)
|
|
Packit Service |
ac8aad |
return -ENOMEM;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
if (object->post_unpatch_callback) {
|
|
Packit Service |
ac8aad |
pr_err("extra post-unpatch callback for object: %s\n",
|
|
Packit Service |
ac8aad |
object->name);
|
|
Packit Service |
ac8aad |
return -EINVAL;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
object->post_unpatch_callback =
|
|
Packit Service |
ac8aad |
(void (*)(struct kpatch_object *)) p_post_unpatch_callback->callback;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
return 0;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
static int __init patch_init(void)
|
|
Packit Service |
ac8aad |
{
|
|
Packit Service |
ac8aad |
int ret;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
ret = kobject_init_and_add(&kpmod.kobj, &patch_ktype,
|
|
Packit Service |
ac8aad |
kpatch_root_kobj, "%s",
|
|
Packit Service |
ac8aad |
THIS_MODULE->name);
|
|
Packit Service |
ac8aad |
if (ret)
|
|
Packit Service |
ac8aad |
return -ENOMEM;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
kpmod.mod = THIS_MODULE;
|
|
Packit Service |
ac8aad |
INIT_LIST_HEAD(&kpmod.objects);
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
ret = patch_make_funcs_list(&kpmod.objects);
|
|
Packit Service |
ac8aad |
if (ret)
|
|
Packit Service |
ac8aad |
goto err_objects;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
ret = patch_make_dynrelas_list(&kpmod.objects);
|
|
Packit Service |
ac8aad |
if (ret)
|
|
Packit Service |
ac8aad |
goto err_objects;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
ret = patch_set_callbacks(&kpmod.objects);
|
|
Packit Service |
ac8aad |
if (ret)
|
|
Packit Service |
ac8aad |
goto err_objects;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
ret = kpatch_register(&kpmod, replace);
|
|
Packit Service |
ac8aad |
if (ret)
|
|
Packit Service |
ac8aad |
goto err_objects;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
return 0;
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
err_objects:
|
|
Packit Service |
ac8aad |
patch_free_objects();
|
|
Packit Service |
ac8aad |
kobject_put(&kpmod.kobj);
|
|
Packit Service |
ac8aad |
return ret;
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
static void __exit patch_exit(void)
|
|
Packit Service |
ac8aad |
{
|
|
Packit Service |
ac8aad |
WARN_ON(kpmod.enabled);
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
patch_free_objects();
|
|
Packit Service |
ac8aad |
kobject_put(&kpmod.kobj);
|
|
Packit Service |
ac8aad |
}
|
|
Packit Service |
ac8aad |
|
|
Packit Service |
ac8aad |
module_init(patch_init);
|
|
Packit Service |
ac8aad |
module_exit(patch_exit);
|
|
Packit Service |
ac8aad |
MODULE_LICENSE("GPL");
|