Release 4.11 crypto/algapi.c

/*
 * Cryptographic API for algorithms (i.e., low-level API).
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <linux/err.h>
#include <linux/errno.h>
#include <linux/fips.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/string.h>

#include "internal.h"

static LIST_HEAD(crypto_template_list);



static inline int crypto_set_driver_name(struct crypto_alg *alg)
{
	static const char suffix[] = "-generic";
	char *driver_name = alg->cra_driver_name;
	int len;

	if (*driver_name)
		return 0;

	len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
	if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
		return -ENAMETOOLONG;

	memcpy(driver_name + len, suffix, sizeof(suffix));
	return 0;
}

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static inline void crypto_check_module_sig(struct module *mod)
{
	if (fips_enabled && mod && !module_sig_ok(mod))
		panic("Module %s signature verification failed in FIPS mode\n",
		      module_name(mod));
}

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static int crypto_check_alg(struct crypto_alg *alg)
{
	crypto_check_module_sig(alg->cra_module);

	if (alg->cra_alignmask & (alg->cra_alignmask + 1))
		return -EINVAL;

	if (alg->cra_blocksize > PAGE_SIZE / 8)
		return -EINVAL;

	if (alg->cra_priority < 0)
		return -EINVAL;

	atomic_set(&alg->cra_refcnt, 1);

	return crypto_set_driver_name(alg);
}

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static void crypto_free_instance(struct crypto_instance *inst)
{
	if (!inst->alg.cra_type->free) {
		inst->tmpl->free(inst);
		return;
	}

	inst->alg.cra_type->free(inst);
}

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static void crypto_destroy_instance(struct crypto_alg *alg)
{
	struct crypto_instance *inst = (void *)alg;
	struct crypto_template *tmpl = inst->tmpl;

	crypto_free_instance(inst);
	crypto_tmpl_put(tmpl);
}

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static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
					    struct list_head *stack,
					    struct list_head *top,
					    struct list_head *secondary_spawns)
{
	struct crypto_spawn *spawn, *n;

	spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
	if (!spawn)
		return NULL;

	n = list_next_entry(spawn, list);

	if (spawn->alg && &n->list != stack && !n->alg)
		n->alg = (n->list.next == stack) ? alg :
			 &list_next_entry(n, list)->inst->alg;

	list_move(&spawn->list, secondary_spawns);

	return &n->list == stack ? top : &n->inst->alg.cra_users;
}

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static void crypto_remove_instance(struct crypto_instance *inst,
				   struct list_head *list)
{
	struct crypto_template *tmpl = inst->tmpl;

	if (crypto_is_dead(&inst->alg))
		return;

	inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
	if (hlist_unhashed(&inst->list))
		return;

	if (!tmpl || !crypto_tmpl_get(tmpl))
		return;

	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
	list_move(&inst->alg.cra_list, list);
	hlist_del(&inst->list);
	inst->alg.cra_destroy = crypto_destroy_instance;

	BUG_ON(!list_empty(&inst->alg.cra_users));
}

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void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
			  struct crypto_alg *nalg)
{
	u32 new_type = (nalg ?: alg)->cra_flags;
	struct crypto_spawn *spawn, *n;
	LIST_HEAD(secondary_spawns);
	struct list_head *spawns;
	LIST_HEAD(stack);
	LIST_HEAD(top);

	spawns = &alg->cra_users;
	list_for_each_entry_safe(spawn, n, spawns, list) {
		if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
			continue;

		list_move(&spawn->list, &top);
	}

	spawns = &top;
	do {
		while (!list_empty(spawns)) {
			struct crypto_instance *inst;

			spawn = list_first_entry(spawns, struct crypto_spawn,
						 list);
			inst = spawn->inst;

			BUG_ON(&inst->alg == alg);

			list_move(&spawn->list, &stack);

			if (&inst->alg == nalg)
				break;

			spawn->alg = NULL;
			spawns = &inst->alg.cra_users;
		}
	} while ((spawns = crypto_more_spawns(alg, &stack, &top,
					      &secondary_spawns)));

	list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
		if (spawn->alg)
			list_move(&spawn->list, &spawn->alg->cra_users);
		else
			crypto_remove_instance(spawn->inst, list);
	}
}
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EXPORT_SYMBOL_GPL(crypto_remove_spawns);



static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
{
	struct crypto_alg *q;
	struct crypto_larval *larval;
	int ret = -EAGAIN;

	if (crypto_is_dead(alg))
		goto err;

	INIT_LIST_HEAD(&alg->cra_users);

	/* No cheating! */
	alg->cra_flags &= ~CRYPTO_ALG_TESTED;

	ret = -EEXIST;

	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		if (q == alg)
			goto err;

		if (crypto_is_moribund(q))
			continue;

		if (crypto_is_larval(q)) {
			if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
				goto err;
			continue;
		}

		if (!strcmp(q->cra_driver_name, alg->cra_name) ||
		    !strcmp(q->cra_name, alg->cra_driver_name))
			goto err;
	}

	larval = crypto_larval_alloc(alg->cra_name,
				     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
	if (IS_ERR(larval))
		goto out;

	ret = -ENOENT;
	larval->adult = crypto_mod_get(alg);
	if (!larval->adult)
		goto free_larval;

	atomic_set(&larval->alg.cra_refcnt, 1);
	memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
	       CRYPTO_MAX_ALG_NAME);
	larval->alg.cra_priority = alg->cra_priority;

	list_add(&alg->cra_list, &crypto_alg_list);
	list_add(&larval->alg.cra_list, &crypto_alg_list);

out:
	return larval;

free_larval:
	kfree(larval);
err:
	larval = ERR_PTR(ret);
	goto out;
}

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void crypto_alg_tested(const char *name, int err)
{
	struct crypto_larval *test;
	struct crypto_alg *alg;
	struct crypto_alg *q;
	LIST_HEAD(list);

	down_write(&crypto_alg_sem);
	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		if (crypto_is_moribund(q) || !crypto_is_larval(q))
			continue;

		test = (struct crypto_larval *)q;

		if (!strcmp(q->cra_driver_name, name))
			goto found;
	}

	printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
	goto unlock;

found:
	q->cra_flags |= CRYPTO_ALG_DEAD;
	alg = test->adult;
	if (err || list_empty(&alg->cra_list))
		goto complete;

	alg->cra_flags |= CRYPTO_ALG_TESTED;

	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		if (q == alg)
			continue;

		if (crypto_is_moribund(q))
			continue;

		if (crypto_is_larval(q)) {
			struct crypto_larval *larval = (void *)q;

			/*
                         * Check to see if either our generic name or
                         * specific name can satisfy the name requested
                         * by the larval entry q.
                         */
			if (strcmp(alg->cra_name, q->cra_name) &&
			    strcmp(alg->cra_driver_name, q->cra_name))
				continue;

			if (larval->adult)
				continue;
			if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
				continue;
			if (!crypto_mod_get(alg))
				continue;

			larval->adult = alg;
			continue;
		}

		if (strcmp(alg->cra_name, q->cra_name))
			continue;

		if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
		    q->cra_priority > alg->cra_priority)
			continue;

		crypto_remove_spawns(q, &list, alg);
	}

complete:
	complete_all(&test->completion);

unlock:
	up_write(&crypto_alg_sem);

	crypto_remove_final(&list);
}
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EXPORT_SYMBOL_GPL(crypto_alg_tested);



void crypto_remove_final(struct list_head *list)
{
	struct crypto_alg *alg;
	struct crypto_alg *n;

	list_for_each_entry_safe(alg, n, list, cra_list) {
		list_del_init(&alg->cra_list);
		crypto_alg_put(alg);
	}
}
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EXPORT_SYMBOL_GPL(crypto_remove_final);



static void crypto_wait_for_test(struct crypto_larval *larval)
{
	int err;

	err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
	if (err != NOTIFY_STOP) {
		if (WARN_ON(err != NOTIFY_DONE))
			goto out;
		crypto_alg_tested(larval->alg.cra_driver_name, 0);
	}

	err = wait_for_completion_killable(&larval->completion);
	WARN_ON(err);

out:
	crypto_larval_kill(&larval->alg);
}

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int crypto_register_alg(struct crypto_alg *alg)
{
	struct crypto_larval *larval;
	int err;

	alg->cra_flags &= ~CRYPTO_ALG_DEAD;
	err = crypto_check_alg(alg);
	if (err)
		return err;

	down_write(&crypto_alg_sem);
	larval = __crypto_register_alg(alg);
	up_write(&crypto_alg_sem);

	if (IS_ERR(larval))
		return PTR_ERR(larval);

	crypto_wait_for_test(larval);
	return 0;
}
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EXPORT_SYMBOL_GPL(crypto_register_alg);



static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
{
	if (unlikely(list_empty(&alg->cra_list)))
		return -ENOENT;

	alg->cra_flags |= CRYPTO_ALG_DEAD;

	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
	list_del_init(&alg->cra_list);
	crypto_remove_spawns(alg, list, NULL);

	return 0;
}

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int crypto_unregister_alg(struct crypto_alg *alg)
{
	int ret;
	LIST_HEAD(list);

	down_write(&crypto_alg_sem);
	ret = crypto_remove_alg(alg, &list);
	up_write(&crypto_alg_sem);

	if (ret)
		return ret;

	BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
	if (alg->cra_destroy)
		alg->cra_destroy(alg);

	crypto_remove_final(&list);
	return 0;
}
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EXPORT_SYMBOL_GPL(crypto_unregister_alg);



int crypto_register_algs(struct crypto_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_register_alg(&algs[i]);
		if (ret)
			goto err;
	}

	return 0;

err:
	for (--i; i >= 0; --i)
		crypto_unregister_alg(&algs[i]);

	return ret;
}
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EXPORT_SYMBOL_GPL(crypto_register_algs);



int crypto_unregister_algs(struct crypto_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_unregister_alg(&algs[i]);
		if (ret)
			pr_err("Failed to unregister %s %s: %d\n",
			       algs[i].cra_driver_name, algs[i].cra_name, ret);
	}

	return 0;
}
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EXPORT_SYMBOL_GPL(crypto_unregister_algs);



int crypto_register_template(struct crypto_template *tmpl)
{
	struct crypto_template *q;
	int err = -EEXIST;

	down_write(&crypto_alg_sem);

	crypto_check_module_sig(tmpl->module);

	list_for_each_entry(q, &crypto_template_list, list) {
		if (q == tmpl)
			goto out;
	}

	list_add(&tmpl->list, &crypto_template_list);
	crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
	err = 0;
out:
	up_write(&crypto_alg_sem);
	return err;
}
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EXPORT_SYMBOL_GPL(crypto_register_template);



void crypto_unregister_template(struct crypto_template *tmpl)
{
	struct crypto_instance *inst;
	struct hlist_node *n;
	struct hlist_head *list;
	LIST_HEAD(users);

	down_write(&crypto_alg_sem);

	BUG_ON(list_empty(&tmpl->list));
	list_del_init(&tmpl->list);

	list = &tmpl->instances;
	hlist_for_each_entry(inst, list, list) {
		int err = crypto_remove_alg(&inst->alg, &users);

		BUG_ON(err);
	}

	crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);

	up_write(&crypto_alg_sem);

	hlist_for_each_entry_safe(inst, n, list, list) {
		BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
		crypto_free_instance(inst);
	}
	crypto_remove_final(&users);
}
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EXPORT_SYMBOL_GPL(crypto_unregister_template);



static struct crypto_template *__crypto_lookup_template(const char *name)
{
	struct crypto_template *q, *tmpl = NULL;

	down_read(&crypto_alg_sem);
	list_for_each_entry(q, &crypto_template_list, list) {
		if (strcmp(q->name, name))
			continue;
		if (unlikely(!crypto_tmpl_get(q)))
			continue;

		tmpl = q;
		break;
	}
	up_read(&crypto_alg_sem);

	return tmpl;
}

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struct crypto_template *crypto_lookup_template(const char *name)
{
	return try_then_request_module(__crypto_lookup_template(name),
				       "crypto-%s", name);
}
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EXPORT_SYMBOL_GPL(crypto_lookup_template);



int crypto_register_instance(struct crypto_template *tmpl,
			     struct crypto_instance *inst)
{
	struct crypto_larval *larval;
	int err;

	err = crypto_check_alg(&inst->alg);
	if (err)
		return err;

	inst->alg.cra_module = tmpl->module;
	inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;

	if (unlikely(!crypto_mod_get(&inst->alg)))
		return -EAGAIN;

	down_write(&crypto_alg_sem);

	larval = __crypto_register_alg(&inst->alg);
	if (IS_ERR(larval))
		goto unlock;

	hlist_add_head(&inst->list, &tmpl->instances);
	inst->tmpl = tmpl;

unlock:
	up_write(&crypto_alg_sem);

	err = PTR_ERR(larval);
	if (IS_ERR(larval))
		goto err;

	crypto_wait_for_test(larval);

	/* Remove instance if test failed */
	if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
		crypto_unregister_instance(inst);
	err = 0;

err:
	crypto_mod_put(&inst->alg);
	return err;
}
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EXPORT_SYMBOL_GPL(crypto_register_instance);



int crypto_unregister_instance(struct crypto_instance *inst)
{
	LIST_HEAD(list);

	down_write(&crypto_alg_sem);

	crypto_remove_spawns(&inst->alg, &list, NULL);
	crypto_remove_instance(inst, &list);

	up_write(&crypto_alg_sem);

	crypto_remove_final(&list);

	return 0;
}
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EXPORT_SYMBOL_GPL(crypto_unregister_instance);



int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
		      struct crypto_instance *inst, u32 mask)
{
	int err = -EAGAIN;

	spawn->inst = inst;
	spawn->mask = mask;

	down_write(&crypto_alg_sem);
	if (!crypto_is_moribund(alg)) {
		list_add(&spawn->list, &alg->cra_users);
		spawn->alg = alg;
		err = 0;
	}
	up_write(&crypto_alg_sem);

	return err;
}
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EXPORT_SYMBOL_GPL(crypto_init_spawn);



int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
		       struct crypto_instance *inst,
		       const struct crypto_type *frontend)
{
	int err = -EINVAL;

	if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
		goto out;

	spawn->frontend = frontend;
	err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);

out:
	return err;
}
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EXPORT_SYMBOL_GPL(crypto_init_spawn2);



int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
		      u32 type, u32 mask)
{
	struct crypto_alg *alg;
	int err;

	alg = crypto_find_alg(name, spawn->frontend, type, mask);
	if (IS_ERR(alg))
		return PTR_ERR(alg);

	err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
	crypto_mod_put(alg);
	return err;
}
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EXPORT_SYMBOL_GPL(crypto_grab_spawn);



void crypto_drop_spawn(struct crypto_spawn *spawn)
{
	if (!spawn->alg)
		return;

	down_write(&crypto_alg_sem);
	list_del(&spawn->list);
	up_write(&crypto_alg_sem);
}
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EXPORT_SYMBOL_GPL(crypto_drop_spawn);



static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
{
	struct crypto_alg *alg;
	struct crypto_alg *alg2;

	down_read(&crypto_alg_sem);
	alg = spawn->alg;
	alg2 = alg;
	if (alg2)
		alg2 = crypto_mod_get(alg2);
	up_read(&crypto_alg_sem);

	if (!alg2) {
		if (alg)
			crypto_shoot_alg(alg);
		return ERR_PTR(-EAGAIN);
	}

	return alg;
}

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struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
				    u32 mask)
{
	struct crypto_alg *alg;
	struct crypto_tfm *tfm;

	alg = crypto_spawn_alg(spawn);
	if (IS_ERR(alg))
		return ERR_CAST(alg);

	tfm = ERR_PTR(-EINVAL);
	if (unlikely((alg->cra_flags ^ type) & mask))
		goto out_put_alg;

	tfm = __crypto_alloc_tfm(alg, type, mask);
	if (IS_ERR(tfm))
		goto out_put_alg;

	return tfm;

out_put_alg:
	crypto_mod_put(alg);
	return tfm;
}
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EXPORT_SYMBOL_GPL(crypto_spawn_tfm);



void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
{
	struct crypto_alg *alg;
	struct crypto_tfm *tfm;