// SPDX-License-Identifier: GPL-2.0-or-later/* * Create default crypto algorithm instances. * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> */ #include <crypto/internal/aead.h>#include <linux/completion.h>#include <linux/ctype.h>#include <linux/err.h>#include <linux/init.h>#include <linux/kthread.h>#include <linux/module.h>#include <linux/notifier.h>#include <linux/rtnetlink.h>#include <linux/sched/signal.h>#include <linux/slab.h>#include <linux/string.h> #include "internal.h" struct cryptomgr_param {	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2]; 	struct {		struct rtattr attr;		struct crypto_attr_type data;	} type; 	struct {		struct rtattr attr;		struct crypto_attr_alg data;	} attrs[CRYPTO_MAX_ATTRS]; 	char template[CRYPTO_MAX_ALG_NAME]; 	struct crypto_larval *larval; 	u32 otype;	u32 omask;}; struct crypto_test_param {	char driver[CRYPTO_MAX_ALG_NAME];	char alg[CRYPTO_MAX_ALG_NAME];	u32 type;}; static int cryptomgr_probe(void *data){	struct cryptomgr_param *param = data;	struct crypto_template *tmpl;	int err = -ENOENT; 	tmpl = crypto_lookup_template(param->template);	if (!tmpl)		goto out; 	do {		err = tmpl->create(tmpl, param->tb);	} while (err == -EAGAIN && !signal_pending(current)); 	crypto_tmpl_put(tmpl); out:	param->larval->adult = ERR_PTR(err);	param->larval->alg.cra_flags |= CRYPTO_ALG_DEAD;	complete_all(&param->larval->completion);	crypto_alg_put(&param->larval->alg);	kfree(param);	module_put_and_kthread_exit(0);} static int cryptomgr_schedule_probe(struct crypto_larval *larval){	struct task_struct *thread;	struct cryptomgr_param *param;	const char *name = larval->alg.cra_name;	const char *p;	unsigned int len;	int i; 	if (!try_module_get(THIS_MODULE))		goto err; 	param = kzalloc_obj(*param);	if (!param)		goto err_put_module; 	for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)		; 	len = p - name;	if (!len || *p != '(')		goto err_free_param; 	memcpy(param->template, name, len); 	i = 0;	for (;;) {		name = ++p; 		for (; isalnum(*p) || *p == '-' || *p == '_'; p++)			; 		if (*p == '(') {			int recursion = 0; 			for (;;) {				if (!*++p)					goto err_free_param;				if (*p == '(')					recursion++;				else if (*p == ')' && !recursion--)					break;			} 			p++;		} 		len = p - name;		if (!len)			goto err_free_param; 		param->attrs[i].attr.rta_len = sizeof(param->attrs[i]);		param->attrs[i].attr.rta_type = CRYPTOA_ALG;		memcpy(param->attrs[i].data.name, name, len); 		param->tb[i + 1] = &param->attrs[i].attr;		i++; 		if (i >= CRYPTO_MAX_ATTRS)			goto err_free_param; 		if (*p == ')')			break; 		if (*p != ',')			goto err_free_param;	} 	param->tb[i + 1] = NULL; 	param->type.attr.rta_len = sizeof(param->type);	param->type.attr.rta_type = CRYPTOA_TYPE;	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;	param->tb[0] = &param->type.attr; 	param->otype = larval->alg.cra_flags;	param->omask = larval->mask; 	crypto_alg_get(&larval->alg);	param->larval = larval; 	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");	if (IS_ERR(thread))		goto err_put_larval; 	return NOTIFY_STOP; err_put_larval:	crypto_alg_put(&larval->alg);err_free_param:	kfree(param);err_put_module:	module_put(THIS_MODULE);err:	return NOTIFY_OK;} static int cryptomgr_test(void *data){	struct crypto_test_param *param = data;	u32 type = param->type;	int err; 	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED); 	crypto_alg_tested(param->driver, err); 	kfree(param);	module_put_and_kthread_exit(0);} static int cryptomgr_schedule_test(struct crypto_alg *alg){	struct task_struct *thread;	struct crypto_test_param *param; 	if (!IS_ENABLED(CONFIG_CRYPTO_SELFTESTS))		return NOTIFY_DONE; 	if (!try_module_get(THIS_MODULE))		goto err; 	param = kzalloc_obj(*param);	if (!param)		goto err_put_module; 	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));	memcpy(param->alg, alg->cra_name, sizeof(param->alg));	param->type = alg->cra_flags; 	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");	if (IS_ERR(thread))		goto err_free_param; 	return NOTIFY_STOP; err_free_param:	kfree(param);err_put_module:	module_put(THIS_MODULE);err:	return NOTIFY_OK;} static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,			    void *data){	switch (msg) {	case CRYPTO_MSG_ALG_REQUEST:		return cryptomgr_schedule_probe(data);	case CRYPTO_MSG_ALG_REGISTER:		return cryptomgr_schedule_test(data);	case CRYPTO_MSG_ALG_LOADED:		break;	} 	return NOTIFY_DONE;} static struct notifier_block cryptomgr_notifier = {	.notifier_call = cryptomgr_notify,}; static int __init cryptomgr_init(void){	return crypto_register_notifier(&cryptomgr_notifier);} static void __exit cryptomgr_exit(void){	int err = crypto_unregister_notifier(&cryptomgr_notifier);	BUG_ON(err);} module_init(cryptomgr_init);module_exit(cryptomgr_exit); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Crypto Algorithm Manager");