Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1119 insertions, 0 deletions

diff --git a/crypto/algapi.c b/crypto/algapi.c
new file mode 100644
index 0000000000..85bc279b42
--- /dev/null
+++ b/crypto/algapi.c
@@ -0,0 +1,1119 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Cryptographic API for algorithms (i.e., low-level API).
+ *
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/internal/simd.h>
+#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 <linux/workqueue.h>
+
+#include "internal.h"
+
+static LIST_HEAD(crypto_template_list);
+
+#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
+DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
+EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
+#endif
+
+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));
+}
+
+static int crypto_check_alg(struct crypto_alg *alg)
+{
+	crypto_check_module_sig(alg->cra_module);
+
+	if (!alg->cra_name[0] || !alg->cra_driver_name[0])
+		return -EINVAL;
+
+	if (alg->cra_alignmask & (alg->cra_alignmask + 1))
+		return -EINVAL;
+
+	/* General maximums for all algs. */
+	if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
+		return -EINVAL;
+
+	if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
+		return -EINVAL;
+
+	/* Lower maximums for specific alg types. */
+	if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+			       CRYPTO_ALG_TYPE_CIPHER) {
+		if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
+			return -EINVAL;
+
+		if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
+			return -EINVAL;
+	}
+
+	if (alg->cra_priority < 0)
+		return -EINVAL;
+
+	refcount_set(&alg->cra_refcnt, 1);
+
+	return 0;
+}
+
+static void crypto_free_instance(struct crypto_instance *inst)
+{
+	inst->alg.cra_type->free(inst);
+}
+
+static void crypto_destroy_instance_workfn(struct work_struct *w)
+{
+	struct crypto_instance *inst = container_of(w, struct crypto_instance,
+						    free_work);
+	struct crypto_template *tmpl = inst->tmpl;
+
+	crypto_free_instance(inst);
+	crypto_tmpl_put(tmpl);
+}
+
+static void crypto_destroy_instance(struct crypto_alg *alg)
+{
+	struct crypto_instance *inst = container_of(alg,
+						    struct crypto_instance,
+						    alg);
+
+	INIT_WORK(&inst->free_work, crypto_destroy_instance_workfn);
+	schedule_work(&inst->free_work);
+}
+
+/*
+ * This function adds a spawn to the list secondary_spawns which
+ * will be used at the end of crypto_remove_spawns to unregister
+ * instances, unless the spawn happens to be one that is depended
+ * on by the new algorithm (nalg in crypto_remove_spawns).
+ *
+ * This function is also responsible for resurrecting any algorithms
+ * in the dependency chain of nalg by unsetting n->dead.
+ */
+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_prev_entry(spawn, list);
+	list_move(&spawn->list, secondary_spawns);
+
+	if (list_is_last(&n->list, stack))
+		return top;
+
+	n = list_next_entry(n, list);
+	if (!spawn->dead)
+		n->dead = false;
+
+	return &n->inst->alg.cra_users;
+}
+
+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 (!tmpl || !crypto_tmpl_get(tmpl))
+		return;
+
+	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));
+}
+
+/*
+ * Given an algorithm alg, remove all algorithms that depend on it
+ * through spawns.  If nalg is not null, then exempt any algorithms
+ * that is depended on by nalg.  This is useful when nalg itself
+ * depends on alg.
+ */
+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);
+	}
+
+	/*
+	 * Perform a depth-first walk starting from alg through
+	 * the cra_users tree.  The list stack records the path
+	 * from alg to the current spawn.
+	 */
+	spawns = &top;
+	do {
+		while (!list_empty(spawns)) {
+			struct crypto_instance *inst;
+
+			spawn = list_first_entry(spawns, struct crypto_spawn,
+						 list);
+			inst = spawn->inst;
+
+			list_move(&spawn->list, &stack);
+			spawn->dead = !spawn->registered || &inst->alg != nalg;
+
+			if (!spawn->registered)
+				break;
+
+			BUG_ON(&inst->alg == alg);
+
+			if (&inst->alg == nalg)
+				break;
+
+			spawns = &inst->alg.cra_users;
+
+			/*
+			 * Even if spawn->registered is true, the
+			 * instance itself may still be unregistered.
+			 * This is because it may have failed during
+			 * registration.  Therefore we still need to
+			 * make the following test.
+			 *
+			 * We may encounter an unregistered instance here, since
+			 * an instance's spawns are set up prior to the instance
+			 * being registered.  An unregistered instance will have
+			 * NULL ->cra_users.next, since ->cra_users isn't
+			 * properly initialized until registration.  But an
+			 * unregistered instance cannot have any users, so treat
+			 * it the same as ->cra_users being empty.
+			 */
+			if (spawns->next == NULL)
+				break;
+		}
+	} while ((spawns = crypto_more_spawns(alg, &stack, &top,
+					      &secondary_spawns)));
+
+	/*
+	 * Remove all instances that are marked as dead.  Also
+	 * complete the resurrection of the others by moving them
+	 * back to the cra_users list.
+	 */
+	list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
+		if (!spawn->dead)
+			list_move(&spawn->list, &spawn->alg->cra_users);
+		else if (spawn->registered)
+			crypto_remove_instance(spawn->inst, list);
+	}
+}
+EXPORT_SYMBOL_GPL(crypto_remove_spawns);
+
+static void crypto_alg_finish_registration(struct crypto_alg *alg,
+					   bool fulfill_requests,
+					   struct list_head *algs_to_put)
+{
+	struct crypto_alg *q;
+
+	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 (fulfill_requests && crypto_mod_get(alg))
+				larval->adult = alg;
+			else
+				larval->adult = ERR_PTR(-EAGAIN);
+
+			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, algs_to_put, alg);
+	}
+
+	crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
+}
+
+static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
+{
+	struct crypto_larval *larval;
+
+	if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
+	    IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
+	    (alg->cra_flags & CRYPTO_ALG_INTERNAL))
+		return NULL; /* No self-test needed */
+
+	larval = crypto_larval_alloc(alg->cra_name,
+				     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
+	if (IS_ERR(larval))
+		return larval;
+
+	larval->adult = crypto_mod_get(alg);
+	if (!larval->adult) {
+		kfree(larval);
+		return ERR_PTR(-ENOENT);
+	}
+
+	refcount_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;
+
+	return larval;
+}
+
+static struct crypto_larval *
+__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
+{
+	struct crypto_alg *q;
+	struct crypto_larval *larval;
+	int ret = -EAGAIN;
+
+	if (crypto_is_dead(alg))
+		goto err;
+
+	INIT_LIST_HEAD(&alg->cra_users);
+
+	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_driver_name, alg->cra_driver_name) ||
+		    !strcmp(q->cra_name, alg->cra_driver_name))
+			goto err;
+	}
+
+	larval = crypto_alloc_test_larval(alg);
+	if (IS_ERR(larval))
+		goto out;
+
+	list_add(&alg->cra_list, &crypto_alg_list);
+
+	if (larval) {
+		/* No cheating! */
+		alg->cra_flags &= ~CRYPTO_ALG_TESTED;
+
+		list_add(&larval->alg.cra_list, &crypto_alg_list);
+	} else {
+		alg->cra_flags |= CRYPTO_ALG_TESTED;
+		crypto_alg_finish_registration(alg, true, algs_to_put);
+	}
+
+out:
+	return larval;
+
+err:
+	larval = ERR_PTR(ret);
+	goto out;
+}
+
+void crypto_alg_tested(const char *name, int err)
+{
+	struct crypto_larval *test;
+	struct crypto_alg *alg;
+	struct crypto_alg *q;
+	LIST_HEAD(list);
+	bool best;
+
+	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;
+	}
+
+	pr_err("alg: Unexpected test result for %s: %d\n", name, err);
+	goto unlock;
+
+found:
+	q->cra_flags |= CRYPTO_ALG_DEAD;
+	alg = test->adult;
+
+	if (list_empty(&alg->cra_list))
+		goto complete;
+
+	if (err == -ECANCELED)
+		alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
+	else if (err)
+		goto complete;
+	else
+		alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
+
+	alg->cra_flags |= CRYPTO_ALG_TESTED;
+
+	/*
+	 * If a higher-priority implementation of the same algorithm is
+	 * currently being tested, then don't fulfill request larvals.
+	 */
+	best = true;
+	list_for_each_entry(q, &crypto_alg_list, cra_list) {
+		if (crypto_is_moribund(q) || !crypto_is_larval(q))
+			continue;
+
+		if (strcmp(alg->cra_name, q->cra_name))
+			continue;
+
+		if (q->cra_priority > alg->cra_priority) {
+			best = false;
+			break;
+		}
+	}
+
+	crypto_alg_finish_registration(alg, best, &list);
+
+complete:
+	complete_all(&test->completion);
+
+unlock:
+	up_write(&crypto_alg_sem);
+
+	crypto_remove_final(&list);
+}
+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);
+	}
+}
+EXPORT_SYMBOL_GPL(crypto_remove_final);
+
+int crypto_register_alg(struct crypto_alg *alg)
+{
+	struct crypto_larval *larval;
+	LIST_HEAD(algs_to_put);
+	bool test_started = false;
+	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, &algs_to_put);
+	if (!IS_ERR_OR_NULL(larval)) {
+		test_started = crypto_boot_test_finished();
+		larval->test_started = test_started;
+	}
+	up_write(&crypto_alg_sem);
+
+	if (IS_ERR(larval))
+		return PTR_ERR(larval);
+	if (test_started)
+		crypto_wait_for_test(larval);
+	crypto_remove_final(&algs_to_put);
+	return 0;
+}
+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;
+
+	list_del_init(&alg->cra_list);
+	crypto_remove_spawns(alg, list, NULL);
+
+	return 0;
+}
+
+void 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 (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
+		return;
+
+	if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
+		return;
+
+	if (alg->cra_destroy)
+		alg->cra_destroy(alg);
+
+	crypto_remove_final(&list);
+}
+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;
+}
+EXPORT_SYMBOL_GPL(crypto_register_algs);
+
+void crypto_unregister_algs(struct crypto_alg *algs, int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++)
+		crypto_unregister_alg(&algs[i]);
+}
+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);
+	err = 0;
+out:
+	up_write(&crypto_alg_sem);
+	return err;
+}
+EXPORT_SYMBOL_GPL(crypto_register_template);
+
+int crypto_register_templates(struct crypto_template *tmpls, int count)
+{
+	int i, err;
+
+	for (i = 0; i < count; i++) {
+		err = crypto_register_template(&tmpls[i]);
+		if (err)
+			goto out;
+	}
+	return 0;
+
+out:
+	for (--i; i >= 0; --i)
+		crypto_unregister_template(&tmpls[i]);
+	return err;
+}
+EXPORT_SYMBOL_GPL(crypto_register_templates);
+
+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);
+	}
+
+	up_write(&crypto_alg_sem);
+
+	hlist_for_each_entry_safe(inst, n, list, list) {
+		BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
+		crypto_free_instance(inst);
+	}
+	crypto_remove_final(&users);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_template);
+
+void crypto_unregister_templates(struct crypto_template *tmpls, int count)
+{
+	int i;
+
+	for (i = count - 1; i >= 0; --i)
+		crypto_unregister_template(&tmpls[i]);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_templates);
+
+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;
+}
+
+struct crypto_template *crypto_lookup_template(const char *name)
+{
+	return try_then_request_module(__crypto_lookup_template(name),
+				       "crypto-%s", name);
+}
+EXPORT_SYMBOL_GPL(crypto_lookup_template);
+
+int crypto_register_instance(struct crypto_template *tmpl,
+			     struct crypto_instance *inst)
+{
+	struct crypto_larval *larval;
+	struct crypto_spawn *spawn;
+	u32 fips_internal = 0;
+	LIST_HEAD(algs_to_put);
+	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;
+
+	down_write(&crypto_alg_sem);
+
+	larval = ERR_PTR(-EAGAIN);
+	for (spawn = inst->spawns; spawn;) {
+		struct crypto_spawn *next;
+
+		if (spawn->dead)
+			goto unlock;
+
+		next = spawn->next;
+		spawn->inst = inst;
+		spawn->registered = true;
+
+		fips_internal |= spawn->alg->cra_flags;
+
+		crypto_mod_put(spawn->alg);
+
+		spawn = next;
+	}
+
+	inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
+
+	larval = __crypto_register_alg(&inst->alg, &algs_to_put);
+	if (IS_ERR(larval))
+		goto unlock;
+	else if (larval)
+		larval->test_started = true;
+
+	hlist_add_head(&inst->list, &tmpl->instances);
+	inst->tmpl = tmpl;
+
+unlock:
+	up_write(&crypto_alg_sem);
+
+	if (IS_ERR(larval))
+		return PTR_ERR(larval);
+	if (larval)
+		crypto_wait_for_test(larval);
+	crypto_remove_final(&algs_to_put);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_register_instance);
+
+void 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);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_instance);
+
+int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
+		      const char *name, u32 type, u32 mask)
+{
+	struct crypto_alg *alg;
+	int err = -EAGAIN;
+
+	if (WARN_ON_ONCE(inst == NULL))
+		return -EINVAL;
+
+	/* Allow the result of crypto_attr_alg_name() to be passed directly */
+	if (IS_ERR(name))
+		return PTR_ERR(name);
+
+	alg = crypto_find_alg(name, spawn->frontend,
+			      type | CRYPTO_ALG_FIPS_INTERNAL, mask);
+	if (IS_ERR(alg))
+		return PTR_ERR(alg);
+
+	down_write(&crypto_alg_sem);
+	if (!crypto_is_moribund(alg)) {
+		list_add(&spawn->list, &alg->cra_users);
+		spawn->alg = alg;
+		spawn->mask = mask;
+		spawn->next = inst->spawns;
+		inst->spawns = spawn;
+		inst->alg.cra_flags |=
+			(alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
+		err = 0;
+	}
+	up_write(&crypto_alg_sem);
+	if (err)
+		crypto_mod_put(alg);
+	return err;
+}
+EXPORT_SYMBOL_GPL(crypto_grab_spawn);
+
+void crypto_drop_spawn(struct crypto_spawn *spawn)
+{
+	if (!spawn->alg) /* not yet initialized? */
+		return;
+
+	down_write(&crypto_alg_sem);
+	if (!spawn->dead)
+		list_del(&spawn->list);
+	up_write(&crypto_alg_sem);
+
+	if (!spawn->registered)
+		crypto_mod_put(spawn->alg);
+}
+EXPORT_SYMBOL_GPL(crypto_drop_spawn);
+
+static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
+{
+	struct crypto_alg *alg = ERR_PTR(-EAGAIN);
+	struct crypto_alg *target;
+	bool shoot = false;
+
+	down_read(&crypto_alg_sem);
+	if (!spawn->dead) {
+		alg = spawn->alg;
+		if (!crypto_mod_get(alg)) {
+			target = crypto_alg_get(alg);
+			shoot = true;
+			alg = ERR_PTR(-EAGAIN);
+		}
+	}
+	up_read(&crypto_alg_sem);
+
+	if (shoot) {
+		crypto_shoot_alg(target);
+		crypto_alg_put(target);
+	}
+
+	return alg;
+}
+
+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;
+}
+EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
+
+void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
+{
+	struct crypto_alg *alg;
+	struct crypto_tfm *tfm;
+
+	alg = crypto_spawn_alg(spawn);
+	if (IS_ERR(alg))
+		return ERR_CAST(alg);
+
+	tfm = crypto_create_tfm(alg, spawn->frontend);
+	if (IS_ERR(tfm))
+		goto out_put_alg;
+
+	return tfm;
+
+out_put_alg:
+	crypto_mod_put(alg);
+	return tfm;
+}
+EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
+
+int crypto_register_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&crypto_chain, nb);
+}
+EXPORT_SYMBOL_GPL(crypto_register_notifier);
+
+int crypto_unregister_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&crypto_chain, nb);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
+
+struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
+{
+	struct rtattr *rta = tb[0];
+	struct crypto_attr_type *algt;
+
+	if (!rta)
+		return ERR_PTR(-ENOENT);
+	if (RTA_PAYLOAD(rta) < sizeof(*algt))
+		return ERR_PTR(-EINVAL);
+	if (rta->rta_type != CRYPTOA_TYPE)
+		return ERR_PTR(-EINVAL);
+
+	algt = RTA_DATA(rta);
+
+	return algt;
+}
+EXPORT_SYMBOL_GPL(crypto_get_attr_type);
+
+/**
+ * crypto_check_attr_type() - check algorithm type and compute inherited mask
+ * @tb: the template parameters
+ * @type: the algorithm type the template would be instantiated as
+ * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
+ *	      to restrict the flags of any inner algorithms
+ *
+ * Validate that the algorithm type the user requested is compatible with the
+ * one the template would actually be instantiated as.  E.g., if the user is
+ * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
+ * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
+ *
+ * Also compute the mask to use to restrict the flags of any inner algorithms.
+ *
+ * Return: 0 on success; -errno on failure
+ */
+int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
+{
+	struct crypto_attr_type *algt;
+
+	algt = crypto_get_attr_type(tb);
+	if (IS_ERR(algt))
+		return PTR_ERR(algt);
+
+	if ((algt->type ^ type) & algt->mask)
+		return -EINVAL;
+
+	*mask_ret = crypto_algt_inherited_mask(algt);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_check_attr_type);
+
+const char *crypto_attr_alg_name(struct rtattr *rta)
+{
+	struct crypto_attr_alg *alga;
+
+	if (!rta)
+		return ERR_PTR(-ENOENT);
+	if (RTA_PAYLOAD(rta) < sizeof(*alga))
+		return ERR_PTR(-EINVAL);
+	if (rta->rta_type != CRYPTOA_ALG)
+		return ERR_PTR(-EINVAL);
+
+	alga = RTA_DATA(rta);
+	alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
+
+	return alga->name;
+}
+EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
+
+int crypto_inst_setname(struct crypto_instance *inst, const char *name,
+			struct crypto_alg *alg)
+{
+	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
+		     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
+		return -ENAMETOOLONG;
+
+	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
+		     name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+		return -ENAMETOOLONG;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_inst_setname);
+
+void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
+{
+	INIT_LIST_HEAD(&queue->list);
+	queue->backlog = &queue->list;
+	queue->qlen = 0;
+	queue->max_qlen = max_qlen;
+}
+EXPORT_SYMBOL_GPL(crypto_init_queue);
+
+int crypto_enqueue_request(struct crypto_queue *queue,
+			   struct crypto_async_request *request)
+{
+	int err = -EINPROGRESS;
+
+	if (unlikely(queue->qlen >= queue->max_qlen)) {
+		if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
+			err = -ENOSPC;
+			goto out;
+		}
+		err = -EBUSY;
+		if (queue->backlog == &queue->list)
+			queue->backlog = &request->list;
+	}
+
+	queue->qlen++;
+	list_add_tail(&request->list, &queue->list);
+
+out:
+	return err;
+}
+EXPORT_SYMBOL_GPL(crypto_enqueue_request);
+
+void crypto_enqueue_request_head(struct crypto_queue *queue,
+				 struct crypto_async_request *request)
+{
+	if (unlikely(queue->qlen >= queue->max_qlen))
+		queue->backlog = queue->backlog->prev;
+
+	queue->qlen++;
+	list_add(&request->list, &queue->list);
+}
+EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
+
+struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
+{
+	struct list_head *request;
+
+	if (unlikely(!queue->qlen))
+		return NULL;
+
+	queue->qlen--;
+
+	if (queue->backlog != &queue->list)
+		queue->backlog = queue->backlog->next;
+
+	request = queue->list.next;
+	list_del(request);
+
+	return list_entry(request, struct crypto_async_request, list);
+}
+EXPORT_SYMBOL_GPL(crypto_dequeue_request);
+
+static inline void crypto_inc_byte(u8 *a, unsigned int size)
+{
+	u8 *b = (a + size);
+	u8 c;
+
+	for (; size; size--) {
+		c = *--b + 1;
+		*b = c;
+		if (c)
+			break;
+	}
+}
+
+void crypto_inc(u8 *a, unsigned int size)
+{
+	__be32 *b = (__be32 *)(a + size);
+	u32 c;
+
+	if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
+	    IS_ALIGNED((unsigned long)b, __alignof__(*b)))
+		for (; size >= 4; size -= 4) {
+			c = be32_to_cpu(*--b) + 1;
+			*b = cpu_to_be32(c);
+			if (likely(c))
+				return;
+		}
+
+	crypto_inc_byte(a, size);
+}
+EXPORT_SYMBOL_GPL(crypto_inc);
+
+unsigned int crypto_alg_extsize(struct crypto_alg *alg)
+{
+	return alg->cra_ctxsize +
+	       (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
+}
+EXPORT_SYMBOL_GPL(crypto_alg_extsize);
+
+int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
+			u32 type, u32 mask)
+{
+	int ret = 0;
+	struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
+
+	if (!IS_ERR(alg)) {
+		crypto_mod_put(alg);
+		ret = 1;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_type_has_alg);
+
+static void __init crypto_start_tests(void)
+{
+	if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
+		return;
+
+	for (;;) {
+		struct crypto_larval *larval = NULL;
+		struct crypto_alg *q;
+
+		down_write(&crypto_alg_sem);
+
+		list_for_each_entry(q, &crypto_alg_list, cra_list) {
+			struct crypto_larval *l;
+
+			if (!crypto_is_larval(q))
+				continue;
+
+			l = (void *)q;
+
+			if (!crypto_is_test_larval(l))
+				continue;
+
+			if (l->test_started)
+				continue;
+
+			l->test_started = true;
+			larval = l;
+			break;
+		}
+
+		up_write(&crypto_alg_sem);
+
+		if (!larval)
+			break;
+
+		crypto_wait_for_test(larval);
+	}
+
+	set_crypto_boot_test_finished();
+}
+
+static int __init crypto_algapi_init(void)
+{
+	crypto_init_proc();
+	crypto_start_tests();
+	return 0;
+}
+
+static void __exit crypto_algapi_exit(void)
+{
+	crypto_exit_proc();
+}
+
+/*
+ * We run this at late_initcall so that all the built-in algorithms
+ * have had a chance to register themselves first.
+ */
+late_initcall(crypto_algapi_init);
+module_exit(crypto_algapi_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cryptographic algorithms API");
+MODULE_SOFTDEP("pre: cryptomgr");