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-rw-r--r--crypto/algapi.c1119
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");