ae131f4970
Add a crypto_tfm_get interface to allow tfm objects to be shared. They can still be freed in the usual way. This should only be done with tfm objects with no keys. You must also not modify the tfm flags in any way once it becomes shared. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Reviewed-by: Simon Horman <simon.horman@corigine.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
664 lines
15 KiB
C
664 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Scatterlist Cryptographic API.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* Copyright (c) 2002 David S. Miller (davem@redhat.com)
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* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
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* and Nettle, by Niels Möller.
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*/
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/module.h>
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#include <linux/param.h>
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/completion.h>
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#include "internal.h"
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LIST_HEAD(crypto_alg_list);
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EXPORT_SYMBOL_GPL(crypto_alg_list);
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DECLARE_RWSEM(crypto_alg_sem);
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EXPORT_SYMBOL_GPL(crypto_alg_sem);
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BLOCKING_NOTIFIER_HEAD(crypto_chain);
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EXPORT_SYMBOL_GPL(crypto_chain);
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#ifndef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
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DEFINE_STATIC_KEY_FALSE(__crypto_boot_test_finished);
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EXPORT_SYMBOL_GPL(__crypto_boot_test_finished);
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#endif
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static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
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struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
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{
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return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
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}
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EXPORT_SYMBOL_GPL(crypto_mod_get);
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void crypto_mod_put(struct crypto_alg *alg)
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{
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struct module *module = alg->cra_module;
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crypto_alg_put(alg);
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module_put(module);
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}
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EXPORT_SYMBOL_GPL(crypto_mod_put);
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static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
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u32 mask)
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{
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struct crypto_alg *q, *alg = NULL;
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int best = -2;
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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int exact, fuzzy;
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if (crypto_is_moribund(q))
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continue;
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if ((q->cra_flags ^ type) & mask)
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continue;
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if (crypto_is_larval(q) &&
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!crypto_is_test_larval((struct crypto_larval *)q) &&
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((struct crypto_larval *)q)->mask != mask)
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continue;
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exact = !strcmp(q->cra_driver_name, name);
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fuzzy = !strcmp(q->cra_name, name);
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if (!exact && !(fuzzy && q->cra_priority > best))
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continue;
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if (unlikely(!crypto_mod_get(q)))
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continue;
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best = q->cra_priority;
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if (alg)
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crypto_mod_put(alg);
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alg = q;
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if (exact)
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break;
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}
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return alg;
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}
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static void crypto_larval_destroy(struct crypto_alg *alg)
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{
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struct crypto_larval *larval = (void *)alg;
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BUG_ON(!crypto_is_larval(alg));
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if (!IS_ERR_OR_NULL(larval->adult))
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crypto_mod_put(larval->adult);
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kfree(larval);
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}
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struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
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{
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struct crypto_larval *larval;
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larval = kzalloc(sizeof(*larval), GFP_KERNEL);
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if (!larval)
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return ERR_PTR(-ENOMEM);
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larval->mask = mask;
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larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
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larval->alg.cra_priority = -1;
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larval->alg.cra_destroy = crypto_larval_destroy;
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strscpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
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init_completion(&larval->completion);
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return larval;
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}
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EXPORT_SYMBOL_GPL(crypto_larval_alloc);
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static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
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u32 mask)
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{
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struct crypto_alg *alg;
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struct crypto_larval *larval;
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larval = crypto_larval_alloc(name, type, mask);
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if (IS_ERR(larval))
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return ERR_CAST(larval);
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refcount_set(&larval->alg.cra_refcnt, 2);
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down_write(&crypto_alg_sem);
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alg = __crypto_alg_lookup(name, type, mask);
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if (!alg) {
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alg = &larval->alg;
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list_add(&alg->cra_list, &crypto_alg_list);
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}
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up_write(&crypto_alg_sem);
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if (alg != &larval->alg) {
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kfree(larval);
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if (crypto_is_larval(alg))
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alg = crypto_larval_wait(alg);
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}
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return alg;
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}
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void crypto_larval_kill(struct crypto_alg *alg)
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{
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struct crypto_larval *larval = (void *)alg;
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down_write(&crypto_alg_sem);
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list_del(&alg->cra_list);
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up_write(&crypto_alg_sem);
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complete_all(&larval->completion);
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crypto_alg_put(alg);
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}
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EXPORT_SYMBOL_GPL(crypto_larval_kill);
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void crypto_wait_for_test(struct crypto_larval *larval)
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{
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int err;
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err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
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if (WARN_ON_ONCE(err != NOTIFY_STOP))
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goto out;
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err = wait_for_completion_killable(&larval->completion);
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WARN_ON(err);
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out:
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crypto_larval_kill(&larval->alg);
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}
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EXPORT_SYMBOL_GPL(crypto_wait_for_test);
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static void crypto_start_test(struct crypto_larval *larval)
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{
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if (!crypto_is_test_larval(larval))
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return;
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if (larval->test_started)
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return;
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down_write(&crypto_alg_sem);
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if (larval->test_started) {
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up_write(&crypto_alg_sem);
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return;
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}
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larval->test_started = true;
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up_write(&crypto_alg_sem);
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crypto_wait_for_test(larval);
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}
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static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
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{
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struct crypto_larval *larval = (void *)alg;
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long timeout;
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if (!crypto_boot_test_finished())
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crypto_start_test(larval);
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timeout = wait_for_completion_killable_timeout(
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&larval->completion, 60 * HZ);
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alg = larval->adult;
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if (timeout < 0)
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alg = ERR_PTR(-EINTR);
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else if (!timeout)
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alg = ERR_PTR(-ETIMEDOUT);
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else if (!alg)
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alg = ERR_PTR(-ENOENT);
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else if (IS_ERR(alg))
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;
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else if (crypto_is_test_larval(larval) &&
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!(alg->cra_flags & CRYPTO_ALG_TESTED))
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alg = ERR_PTR(-EAGAIN);
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else if (alg->cra_flags & CRYPTO_ALG_FIPS_INTERNAL)
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alg = ERR_PTR(-EAGAIN);
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else if (!crypto_mod_get(alg))
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alg = ERR_PTR(-EAGAIN);
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crypto_mod_put(&larval->alg);
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return alg;
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}
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static struct crypto_alg *crypto_alg_lookup(const char *name, u32 type,
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u32 mask)
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{
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const u32 fips = CRYPTO_ALG_FIPS_INTERNAL;
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struct crypto_alg *alg;
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u32 test = 0;
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if (!((type | mask) & CRYPTO_ALG_TESTED))
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test |= CRYPTO_ALG_TESTED;
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down_read(&crypto_alg_sem);
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alg = __crypto_alg_lookup(name, (type | test) & ~fips,
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(mask | test) & ~fips);
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if (alg) {
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if (((type | mask) ^ fips) & fips)
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mask |= fips;
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mask &= fips;
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if (!crypto_is_larval(alg) &&
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((type ^ alg->cra_flags) & mask)) {
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/* Algorithm is disallowed in FIPS mode. */
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crypto_mod_put(alg);
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alg = ERR_PTR(-ENOENT);
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}
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} else if (test) {
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alg = __crypto_alg_lookup(name, type, mask);
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if (alg && !crypto_is_larval(alg)) {
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/* Test failed */
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crypto_mod_put(alg);
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alg = ERR_PTR(-ELIBBAD);
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}
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}
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up_read(&crypto_alg_sem);
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return alg;
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}
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static struct crypto_alg *crypto_larval_lookup(const char *name, u32 type,
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u32 mask)
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{
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struct crypto_alg *alg;
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if (!name)
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return ERR_PTR(-ENOENT);
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type &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
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mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
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alg = crypto_alg_lookup(name, type, mask);
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if (!alg && !(mask & CRYPTO_NOLOAD)) {
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request_module("crypto-%s", name);
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if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
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CRYPTO_ALG_NEED_FALLBACK))
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request_module("crypto-%s-all", name);
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alg = crypto_alg_lookup(name, type, mask);
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}
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if (!IS_ERR_OR_NULL(alg) && crypto_is_larval(alg))
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alg = crypto_larval_wait(alg);
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else if (!alg)
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alg = crypto_larval_add(name, type, mask);
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return alg;
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}
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int crypto_probing_notify(unsigned long val, void *v)
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{
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int ok;
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ok = blocking_notifier_call_chain(&crypto_chain, val, v);
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if (ok == NOTIFY_DONE) {
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request_module("cryptomgr");
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ok = blocking_notifier_call_chain(&crypto_chain, val, v);
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}
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return ok;
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}
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EXPORT_SYMBOL_GPL(crypto_probing_notify);
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struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
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{
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struct crypto_alg *alg;
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struct crypto_alg *larval;
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int ok;
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/*
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* If the internal flag is set for a cipher, require a caller to
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* invoke the cipher with the internal flag to use that cipher.
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* Also, if a caller wants to allocate a cipher that may or may
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* not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and
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* !(mask & CRYPTO_ALG_INTERNAL).
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*/
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if (!((type | mask) & CRYPTO_ALG_INTERNAL))
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mask |= CRYPTO_ALG_INTERNAL;
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larval = crypto_larval_lookup(name, type, mask);
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if (IS_ERR(larval) || !crypto_is_larval(larval))
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return larval;
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ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
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if (ok == NOTIFY_STOP)
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alg = crypto_larval_wait(larval);
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else {
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crypto_mod_put(larval);
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alg = ERR_PTR(-ENOENT);
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}
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crypto_larval_kill(larval);
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return alg;
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}
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EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
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static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
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if (type_obj)
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return type_obj->init(tfm, type, mask);
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return 0;
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}
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static void crypto_exit_ops(struct crypto_tfm *tfm)
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{
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const struct crypto_type *type = tfm->__crt_alg->cra_type;
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if (type && tfm->exit)
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tfm->exit(tfm);
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}
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static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
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{
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const struct crypto_type *type_obj = alg->cra_type;
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unsigned int len;
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len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
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if (type_obj)
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return len + type_obj->ctxsize(alg, type, mask);
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switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
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default:
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BUG();
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case CRYPTO_ALG_TYPE_CIPHER:
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len += crypto_cipher_ctxsize(alg);
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break;
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case CRYPTO_ALG_TYPE_COMPRESS:
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len += crypto_compress_ctxsize(alg);
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break;
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}
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return len;
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}
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void crypto_shoot_alg(struct crypto_alg *alg)
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{
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down_write(&crypto_alg_sem);
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alg->cra_flags |= CRYPTO_ALG_DYING;
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up_write(&crypto_alg_sem);
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}
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EXPORT_SYMBOL_GPL(crypto_shoot_alg);
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struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
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u32 mask)
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{
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struct crypto_tfm *tfm = NULL;
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unsigned int tfm_size;
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int err = -ENOMEM;
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tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
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tfm = kzalloc(tfm_size, GFP_KERNEL);
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if (tfm == NULL)
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goto out_err;
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tfm->__crt_alg = alg;
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refcount_set(&tfm->refcnt, 1);
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err = crypto_init_ops(tfm, type, mask);
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if (err)
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goto out_free_tfm;
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if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
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goto cra_init_failed;
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goto out;
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cra_init_failed:
|
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crypto_exit_ops(tfm);
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out_free_tfm:
|
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if (err == -EAGAIN)
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crypto_shoot_alg(alg);
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kfree(tfm);
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out_err:
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tfm = ERR_PTR(err);
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out:
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return tfm;
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}
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EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
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|
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/*
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* crypto_alloc_base - Locate algorithm and allocate transform
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* @alg_name: Name of algorithm
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* @type: Type of algorithm
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* @mask: Mask for type comparison
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*
|
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* This function should not be used by new algorithm types.
|
|
* Please use crypto_alloc_tfm instead.
|
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*
|
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* crypto_alloc_base() will first attempt to locate an already loaded
|
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* algorithm. If that fails and the kernel supports dynamically loadable
|
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* modules, it will then attempt to load a module of the same name or
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* alias. If that fails it will send a query to any loaded crypto manager
|
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* to construct an algorithm on the fly. A refcount is grabbed on the
|
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* algorithm which is then associated with the new transform.
|
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*
|
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* The returned transform is of a non-determinate type. Most people
|
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* should use one of the more specific allocation functions such as
|
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* crypto_alloc_skcipher().
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|
*
|
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* In case of error the return value is an error pointer.
|
|
*/
|
|
struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
|
|
{
|
|
struct crypto_tfm *tfm;
|
|
int err;
|
|
|
|
for (;;) {
|
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struct crypto_alg *alg;
|
|
|
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alg = crypto_alg_mod_lookup(alg_name, type, mask);
|
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if (IS_ERR(alg)) {
|
|
err = PTR_ERR(alg);
|
|
goto err;
|
|
}
|
|
|
|
tfm = __crypto_alloc_tfm(alg, type, mask);
|
|
if (!IS_ERR(tfm))
|
|
return tfm;
|
|
|
|
crypto_mod_put(alg);
|
|
err = PTR_ERR(tfm);
|
|
|
|
err:
|
|
if (err != -EAGAIN)
|
|
break;
|
|
if (fatal_signal_pending(current)) {
|
|
err = -EINTR;
|
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break;
|
|
}
|
|
}
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_base);
|
|
|
|
void *crypto_create_tfm_node(struct crypto_alg *alg,
|
|
const struct crypto_type *frontend,
|
|
int node)
|
|
{
|
|
char *mem;
|
|
struct crypto_tfm *tfm = NULL;
|
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unsigned int tfmsize;
|
|
unsigned int total;
|
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int err = -ENOMEM;
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|
|
|
tfmsize = frontend->tfmsize;
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total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
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|
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mem = kzalloc_node(total, GFP_KERNEL, node);
|
|
if (mem == NULL)
|
|
goto out_err;
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|
|
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tfm = (struct crypto_tfm *)(mem + tfmsize);
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tfm->__crt_alg = alg;
|
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tfm->node = node;
|
|
refcount_set(&tfm->refcnt, 1);
|
|
|
|
err = frontend->init_tfm(tfm);
|
|
if (err)
|
|
goto out_free_tfm;
|
|
|
|
if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
|
|
goto cra_init_failed;
|
|
|
|
goto out;
|
|
|
|
cra_init_failed:
|
|
crypto_exit_ops(tfm);
|
|
out_free_tfm:
|
|
if (err == -EAGAIN)
|
|
crypto_shoot_alg(alg);
|
|
kfree(mem);
|
|
out_err:
|
|
mem = ERR_PTR(err);
|
|
out:
|
|
return mem;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_create_tfm_node);
|
|
|
|
struct crypto_alg *crypto_find_alg(const char *alg_name,
|
|
const struct crypto_type *frontend,
|
|
u32 type, u32 mask)
|
|
{
|
|
if (frontend) {
|
|
type &= frontend->maskclear;
|
|
mask &= frontend->maskclear;
|
|
type |= frontend->type;
|
|
mask |= frontend->maskset;
|
|
}
|
|
|
|
return crypto_alg_mod_lookup(alg_name, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_find_alg);
|
|
|
|
/*
|
|
* crypto_alloc_tfm_node - Locate algorithm and allocate transform
|
|
* @alg_name: Name of algorithm
|
|
* @frontend: Frontend algorithm type
|
|
* @type: Type of algorithm
|
|
* @mask: Mask for type comparison
|
|
* @node: NUMA node in which users desire to put requests, if node is
|
|
* NUMA_NO_NODE, it means users have no special requirement.
|
|
*
|
|
* crypto_alloc_tfm() will first attempt to locate an already loaded
|
|
* algorithm. If that fails and the kernel supports dynamically loadable
|
|
* modules, it will then attempt to load a module of the same name or
|
|
* alias. If that fails it will send a query to any loaded crypto manager
|
|
* to construct an algorithm on the fly. A refcount is grabbed on the
|
|
* algorithm which is then associated with the new transform.
|
|
*
|
|
* The returned transform is of a non-determinate type. Most people
|
|
* should use one of the more specific allocation functions such as
|
|
* crypto_alloc_skcipher().
|
|
*
|
|
* In case of error the return value is an error pointer.
|
|
*/
|
|
|
|
void *crypto_alloc_tfm_node(const char *alg_name,
|
|
const struct crypto_type *frontend, u32 type, u32 mask,
|
|
int node)
|
|
{
|
|
void *tfm;
|
|
int err;
|
|
|
|
for (;;) {
|
|
struct crypto_alg *alg;
|
|
|
|
alg = crypto_find_alg(alg_name, frontend, type, mask);
|
|
if (IS_ERR(alg)) {
|
|
err = PTR_ERR(alg);
|
|
goto err;
|
|
}
|
|
|
|
tfm = crypto_create_tfm_node(alg, frontend, node);
|
|
if (!IS_ERR(tfm))
|
|
return tfm;
|
|
|
|
crypto_mod_put(alg);
|
|
err = PTR_ERR(tfm);
|
|
|
|
err:
|
|
if (err != -EAGAIN)
|
|
break;
|
|
if (fatal_signal_pending(current)) {
|
|
err = -EINTR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_tfm_node);
|
|
|
|
/*
|
|
* crypto_destroy_tfm - Free crypto transform
|
|
* @mem: Start of tfm slab
|
|
* @tfm: Transform to free
|
|
*
|
|
* This function frees up the transform and any associated resources,
|
|
* then drops the refcount on the associated algorithm.
|
|
*/
|
|
void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_alg *alg;
|
|
|
|
if (IS_ERR_OR_NULL(mem))
|
|
return;
|
|
|
|
if (!refcount_dec_and_test(&tfm->refcnt))
|
|
return;
|
|
alg = tfm->__crt_alg;
|
|
|
|
if (!tfm->exit && alg->cra_exit)
|
|
alg->cra_exit(tfm);
|
|
crypto_exit_ops(tfm);
|
|
crypto_mod_put(alg);
|
|
kfree_sensitive(mem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
|
|
|
|
int crypto_has_alg(const char *name, u32 type, u32 mask)
|
|
{
|
|
int ret = 0;
|
|
struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
|
|
|
|
if (!IS_ERR(alg)) {
|
|
crypto_mod_put(alg);
|
|
ret = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_has_alg);
|
|
|
|
void crypto_req_done(void *data, int err)
|
|
{
|
|
struct crypto_wait *wait = data;
|
|
|
|
if (err == -EINPROGRESS)
|
|
return;
|
|
|
|
wait->err = err;
|
|
complete(&wait->completion);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_req_done);
|
|
|
|
MODULE_DESCRIPTION("Cryptographic core API");
|
|
MODULE_LICENSE("GPL");
|