crypto/algapi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Cryptographic API for algorithms (i.e., low-level API).
   4  *
   5  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   6  */
   7
   8 #include <crypto/algapi.h>
   9 #include <crypto/internal/simd.h>
  10 #include <linux/err.h>
  11 #include <linux/errno.h>
  12 #include <linux/fips.h>
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/list.h>
  16 #include <linux/module.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/slab.h>
  19 #include <linux/string.h>
  20
  21 #include "internal.h"
  22
  23 static LIST_HEAD(crypto_template_list);
  24
  25 #ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
  26 DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
  27 EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
  28 #endif
  29
  30 static inline void crypto_check_module_sig(struct module *mod)
  31 {
  32         if (fips_enabled && mod && !module_sig_ok(mod))
  33                 panic("Module %s signature verification failed in FIPS mode\n",
  34                       module_name(mod));
  35 }
  36
  37 static int crypto_check_alg(struct crypto_alg *alg)
  38 {
  39         crypto_check_module_sig(alg->cra_module);
  40
  41         if (!alg->cra_name[0] || !alg->cra_driver_name[0])
  42                 return -EINVAL;
  43
  44         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  45                 return -EINVAL;
  46
  47         /* General maximums for all algs. */
  48         if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
  49                 return -EINVAL;
  50
  51         if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
  52                 return -EINVAL;
  53
  54         /* Lower maximums for specific alg types. */
  55         if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  56                                CRYPTO_ALG_TYPE_CIPHER) {
  57                 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
  58                         return -EINVAL;
  59
  60                 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
  61                         return -EINVAL;
  62         }
  63
  64         if (alg->cra_priority < 0)
  65                 return -EINVAL;
  66
  67         refcount_set(&alg->cra_refcnt, 1);
  68
  69         return 0;
  70 }
  71
  72 static void crypto_free_instance(struct crypto_instance *inst)
  73 {
  74         inst->alg.cra_type->free(inst);
  75 }
  76
  77 static void crypto_destroy_instance(struct crypto_alg *alg)
  78 {
  79         struct crypto_instance *inst = (void *)alg;
  80         struct crypto_template *tmpl = inst->tmpl;
  81
  82         crypto_free_instance(inst);
  83         crypto_tmpl_put(tmpl);
  84 }
  85
  86 /*
  87  * This function adds a spawn to the list secondary_spawns which
  88  * will be used at the end of crypto_remove_spawns to unregister
  89  * instances, unless the spawn happens to be one that is depended
  90  * on by the new algorithm (nalg in crypto_remove_spawns).
  91  *
  92  * This function is also responsible for resurrecting any algorithms
  93  * in the dependency chain of nalg by unsetting n->dead.
  94  */
  95 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  96                                             struct list_head *stack,
  97                                             struct list_head *top,
  98                                             struct list_head *secondary_spawns)
  99 {
 100         struct crypto_spawn *spawn, *n;
 101
 102         spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
 103         if (!spawn)
 104                 return NULL;
 105
 106         n = list_prev_entry(spawn, list);
 107         list_move(&spawn->list, secondary_spawns);
 108
 109         if (list_is_last(&n->list, stack))
 110                 return top;
 111
 112         n = list_next_entry(n, list);
 113         if (!spawn->dead)
 114                 n->dead = false;
 115
 116         return &n->inst->alg.cra_users;
 117 }
 118
 119 static void crypto_remove_instance(struct crypto_instance *inst,
 120                                    struct list_head *list)
 121 {
 122         struct crypto_template *tmpl = inst->tmpl;
 123
 124         if (crypto_is_dead(&inst->alg))
 125                 return;
 126
 127         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 128
 129         if (!tmpl || !crypto_tmpl_get(tmpl))
 130                 return;
 131
 132         list_move(&inst->alg.cra_list, list);
 133         hlist_del(&inst->list);
 134         inst->alg.cra_destroy = crypto_destroy_instance;
 135
 136         BUG_ON(!list_empty(&inst->alg.cra_users));
 137 }
 138
 139 /*
 140  * Given an algorithm alg, remove all algorithms that depend on it
 141  * through spawns.  If nalg is not null, then exempt any algorithms
 142  * that is depended on by nalg.  This is useful when nalg itself
 143  * depends on alg.
 144  */
 145 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 146                           struct crypto_alg *nalg)
 147 {
 148         u32 new_type = (nalg ?: alg)->cra_flags;
 149         struct crypto_spawn *spawn, *n;
 150         LIST_HEAD(secondary_spawns);
 151         struct list_head *spawns;
 152         LIST_HEAD(stack);
 153         LIST_HEAD(top);
 154
 155         spawns = &alg->cra_users;
 156         list_for_each_entry_safe(spawn, n, spawns, list) {
 157                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 158                         continue;
 159
 160                 list_move(&spawn->list, &top);
 161         }
 162
 163         /*
 164          * Perform a depth-first walk starting from alg through
 165          * the cra_users tree.  The list stack records the path
 166          * from alg to the current spawn.
 167          */
 168         spawns = &top;
 169         do {
 170                 while (!list_empty(spawns)) {
 171                         struct crypto_instance *inst;
 172
 173                         spawn = list_first_entry(spawns, struct crypto_spawn,
 174                                                  list);
 175                         inst = spawn->inst;
 176
 177                         list_move(&spawn->list, &stack);
 178                         spawn->dead = !spawn->registered || &inst->alg != nalg;
 179
 180                         if (!spawn->registered)
 181                                 break;
 182
 183                         BUG_ON(&inst->alg == alg);
 184
 185                         if (&inst->alg == nalg)
 186                                 break;
 187
 188                         spawns = &inst->alg.cra_users;
 189
 190                         /*
 191                          * Even if spawn->registered is true, the
 192                          * instance itself may still be unregistered.
 193                          * This is because it may have failed during
 194                          * registration.  Therefore we still need to
 195                          * make the following test.
 196                          *
 197                          * We may encounter an unregistered instance here, since
 198                          * an instance's spawns are set up prior to the instance
 199                          * being registered.  An unregistered instance will have
 200                          * NULL ->cra_users.next, since ->cra_users isn't
 201                          * properly initialized until registration.  But an
 202                          * unregistered instance cannot have any users, so treat
 203                          * it the same as ->cra_users being empty.
 204                          */
 205                         if (spawns->next == NULL)
 206                                 break;
 207                 }
 208         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 209                                               &secondary_spawns)));
 210
 211         /*
 212          * Remove all instances that are marked as dead.  Also
 213          * complete the resurrection of the others by moving them
 214          * back to the cra_users list.
 215          */
 216         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 217                 if (!spawn->dead)
 218                         list_move(&spawn->list, &spawn->alg->cra_users);
 219                 else if (spawn->registered)
 220                         crypto_remove_instance(spawn->inst, list);
 221         }
 222 }
 223 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 224
 225 static void crypto_alg_finish_registration(struct crypto_alg *alg,
 226                                            bool fulfill_requests,
 227                                            struct list_head *algs_to_put)
 228 {
 229         struct crypto_alg *q;
 230
 231         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 232                 if (q == alg)
 233                         continue;
 234
 235                 if (crypto_is_moribund(q))
 236                         continue;
 237
 238                 if (crypto_is_larval(q)) {
 239                         struct crypto_larval *larval = (void *)q;
 240
 241                         /*
 242                          * Check to see if either our generic name or
 243                          * specific name can satisfy the name requested
 244                          * by the larval entry q.
 245                          */
 246                         if (strcmp(alg->cra_name, q->cra_name) &&
 247                             strcmp(alg->cra_driver_name, q->cra_name))
 248                                 continue;
 249
 250                         if (larval->adult)
 251                                 continue;
 252                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 253                                 continue;
 254
 255                         if (fulfill_requests && crypto_mod_get(alg))
 256                                 larval->adult = alg;
 257                         else
 258                                 larval->adult = ERR_PTR(-EAGAIN);
 259
 260                         continue;
 261                 }
 262
 263                 if (strcmp(alg->cra_name, q->cra_name))
 264                         continue;
 265
 266                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 267                     q->cra_priority > alg->cra_priority)
 268                         continue;
 269
 270                 crypto_remove_spawns(q, algs_to_put, alg);
 271         }
 272
 273         crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
 274 }
 275
 276 static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
 277 {
 278         struct crypto_larval *larval;
 279
 280         if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
 281             IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
 282                 return NULL; /* No self-test needed */
 283
 284         larval = crypto_larval_alloc(alg->cra_name,
 285                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 286         if (IS_ERR(larval))
 287                 return larval;
 288
 289         larval->adult = crypto_mod_get(alg);
 290         if (!larval->adult) {
 291                 kfree(larval);
 292                 return ERR_PTR(-ENOENT);
 293         }
 294
 295         refcount_set(&larval->alg.cra_refcnt, 1);
 296         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 297                CRYPTO_MAX_ALG_NAME);
 298         larval->alg.cra_priority = alg->cra_priority;
 299
 300         return larval;
 301 }
 302
 303 static struct crypto_larval *
 304 __crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
 305 {
 306         struct crypto_alg *q;
 307         struct crypto_larval *larval;
 308         int ret = -EAGAIN;
 309
 310         if (crypto_is_dead(alg))
 311                 goto err;
 312
 313         INIT_LIST_HEAD(&alg->cra_users);
 314
 315         ret = -EEXIST;
 316
 317         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 318                 if (q == alg)
 319                         goto err;
 320
 321                 if (crypto_is_moribund(q))
 322                         continue;
 323
 324                 if (crypto_is_larval(q)) {
 325                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 326                                 goto err;
 327                         continue;
 328                 }
 329
 330                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 331                     !strcmp(q->cra_name, alg->cra_driver_name))
 332                         goto err;
 333         }
 334
 335         larval = crypto_alloc_test_larval(alg);
 336         if (IS_ERR(larval))
 337                 goto out;
 338
 339         list_add(&alg->cra_list, &crypto_alg_list);
 340
 341         crypto_stats_init(alg);
 342
 343         if (larval) {
 344                 /* No cheating! */
 345                 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 346
 347                 list_add(&larval->alg.cra_list, &crypto_alg_list);
 348         } else {
 349                 alg->cra_flags |= CRYPTO_ALG_TESTED;
 350                 crypto_alg_finish_registration(alg, true, algs_to_put);
 351         }
 352
 353 out:
 354         return larval;
 355
 356 err:
 357         larval = ERR_PTR(ret);
 358         goto out;
 359 }
 360
 361 void crypto_alg_tested(const char *name, int err)
 362 {
 363         struct crypto_larval *test;
 364         struct crypto_alg *alg;
 365         struct crypto_alg *q;
 366         LIST_HEAD(list);
 367         bool best;
 368
 369         down_write(&crypto_alg_sem);
 370         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 371                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 372                         continue;
 373
 374                 test = (struct crypto_larval *)q;
 375
 376                 if (!strcmp(q->cra_driver_name, name))
 377                         goto found;
 378         }
 379
 380         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 381         goto unlock;
 382
 383 found:
 384         q->cra_flags |= CRYPTO_ALG_DEAD;
 385         alg = test->adult;
 386
 387         if (list_empty(&alg->cra_list))
 388                 goto complete;
 389
 390         if (err == -ECANCELED)
 391                 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
 392         else if (err)
 393                 goto complete;
 394         else
 395                 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
 396
 397         alg->cra_flags |= CRYPTO_ALG_TESTED;
 398
 399         /*
 400          * If a higher-priority implementation of the same algorithm is
 401          * currently being tested, then don't fulfill request larvals.
 402          */
 403         best = true;
 404         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 405                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 406                         continue;
 407
 408                 if (strcmp(alg->cra_name, q->cra_name))
 409                         continue;
 410
 411                 if (q->cra_priority > alg->cra_priority) {
 412                         best = false;
 413                         break;
 414                 }
 415         }
 416
 417         crypto_alg_finish_registration(alg, best, &list);
 418
 419 complete:
 420         complete_all(&test->completion);
 421
 422 unlock:
 423         up_write(&crypto_alg_sem);
 424
 425         crypto_remove_final(&list);
 426 }
 427 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 428
 429 void crypto_remove_final(struct list_head *list)
 430 {
 431         struct crypto_alg *alg;
 432         struct crypto_alg *n;
 433
 434         list_for_each_entry_safe(alg, n, list, cra_list) {
 435                 list_del_init(&alg->cra_list);
 436                 crypto_alg_put(alg);
 437         }
 438 }
 439 EXPORT_SYMBOL_GPL(crypto_remove_final);
 440
 441 int crypto_register_alg(struct crypto_alg *alg)
 442 {
 443         struct crypto_larval *larval;
 444         LIST_HEAD(algs_to_put);
 445         bool test_started = false;
 446         int err;
 447
 448         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 449         err = crypto_check_alg(alg);
 450         if (err)
 451                 return err;
 452
 453         down_write(&crypto_alg_sem);
 454         larval = __crypto_register_alg(alg, &algs_to_put);
 455         if (!IS_ERR_OR_NULL(larval)) {
 456                 test_started = static_key_enabled(&crypto_boot_test_finished);
 457                 larval->test_started = test_started;
 458         }
 459         up_write(&crypto_alg_sem);
 460
 461         if (IS_ERR(larval))
 462                 return PTR_ERR(larval);
 463         if (test_started)
 464                 crypto_wait_for_test(larval);
 465         crypto_remove_final(&algs_to_put);
 466         return 0;
 467 }
 468 EXPORT_SYMBOL_GPL(crypto_register_alg);
 469
 470 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 471 {
 472         if (unlikely(list_empty(&alg->cra_list)))
 473                 return -ENOENT;
 474
 475         alg->cra_flags |= CRYPTO_ALG_DEAD;
 476
 477         list_del_init(&alg->cra_list);
 478         crypto_remove_spawns(alg, list, NULL);
 479
 480         return 0;
 481 }
 482
 483 void crypto_unregister_alg(struct crypto_alg *alg)
 484 {
 485         int ret;
 486         LIST_HEAD(list);
 487
 488         down_write(&crypto_alg_sem);
 489         ret = crypto_remove_alg(alg, &list);
 490         up_write(&crypto_alg_sem);
 491
 492         if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
 493                 return;
 494
 495         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 496         if (alg->cra_destroy)
 497                 alg->cra_destroy(alg);
 498
 499         crypto_remove_final(&list);
 500 }
 501 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 502
 503 int crypto_register_algs(struct crypto_alg *algs, int count)
 504 {
 505         int i, ret;
 506
 507         for (i = 0; i < count; i++) {
 508                 ret = crypto_register_alg(&algs[i]);
 509                 if (ret)
 510                         goto err;
 511         }
 512
 513         return 0;
 514
 515 err:
 516         for (--i; i >= 0; --i)
 517                 crypto_unregister_alg(&algs[i]);
 518
 519         return ret;
 520 }
 521 EXPORT_SYMBOL_GPL(crypto_register_algs);
 522
 523 void crypto_unregister_algs(struct crypto_alg *algs, int count)
 524 {
 525         int i;
 526
 527         for (i = 0; i < count; i++)
 528                 crypto_unregister_alg(&algs[i]);
 529 }
 530 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 531
 532 int crypto_register_template(struct crypto_template *tmpl)
 533 {
 534         struct crypto_template *q;
 535         int err = -EEXIST;
 536
 537         down_write(&crypto_alg_sem);
 538
 539         crypto_check_module_sig(tmpl->module);
 540
 541         list_for_each_entry(q, &crypto_template_list, list) {
 542                 if (q == tmpl)
 543                         goto out;
 544         }
 545
 546         list_add(&tmpl->list, &crypto_template_list);
 547         err = 0;
 548 out:
 549         up_write(&crypto_alg_sem);
 550         return err;
 551 }
 552 EXPORT_SYMBOL_GPL(crypto_register_template);
 553
 554 int crypto_register_templates(struct crypto_template *tmpls, int count)
 555 {
 556         int i, err;
 557
 558         for (i = 0; i < count; i++) {
 559                 err = crypto_register_template(&tmpls[i]);
 560                 if (err)
 561                         goto out;
 562         }
 563         return 0;
 564
 565 out:
 566         for (--i; i >= 0; --i)
 567                 crypto_unregister_template(&tmpls[i]);
 568         return err;
 569 }
 570 EXPORT_SYMBOL_GPL(crypto_register_templates);
 571
 572 void crypto_unregister_template(struct crypto_template *tmpl)
 573 {
 574         struct crypto_instance *inst;
 575         struct hlist_node *n;
 576         struct hlist_head *list;
 577         LIST_HEAD(users);
 578
 579         down_write(&crypto_alg_sem);
 580
 581         BUG_ON(list_empty(&tmpl->list));
 582         list_del_init(&tmpl->list);
 583
 584         list = &tmpl->instances;
 585         hlist_for_each_entry(inst, list, list) {
 586                 int err = crypto_remove_alg(&inst->alg, &users);
 587
 588                 BUG_ON(err);
 589         }
 590
 591         up_write(&crypto_alg_sem);
 592
 593         hlist_for_each_entry_safe(inst, n, list, list) {
 594                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 595                 crypto_free_instance(inst);
 596         }
 597         crypto_remove_final(&users);
 598 }
 599 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 600
 601 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
 602 {
 603         int i;
 604
 605         for (i = count - 1; i >= 0; --i)
 606                 crypto_unregister_template(&tmpls[i]);
 607 }
 608 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
 609
 610 static struct crypto_template *__crypto_lookup_template(const char *name)
 611 {
 612         struct crypto_template *q, *tmpl = NULL;
 613
 614         down_read(&crypto_alg_sem);
 615         list_for_each_entry(q, &crypto_template_list, list) {
 616                 if (strcmp(q->name, name))
 617                         continue;
 618                 if (unlikely(!crypto_tmpl_get(q)))
 619                         continue;
 620
 621                 tmpl = q;
 622                 break;
 623         }
 624         up_read(&crypto_alg_sem);
 625
 626         return tmpl;
 627 }
 628
 629 struct crypto_template *crypto_lookup_template(const char *name)
 630 {
 631         return try_then_request_module(__crypto_lookup_template(name),
 632                                        "crypto-%s", name);
 633 }
 634 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 635
 636 int crypto_register_instance(struct crypto_template *tmpl,
 637                              struct crypto_instance *inst)
 638 {
 639         struct crypto_larval *larval;
 640         struct crypto_spawn *spawn;
 641         u32 fips_internal = 0;
 642         LIST_HEAD(algs_to_put);
 643         int err;
 644
 645         err = crypto_check_alg(&inst->alg);
 646         if (err)
 647                 return err;
 648
 649         inst->alg.cra_module = tmpl->module;
 650         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 651
 652         down_write(&crypto_alg_sem);
 653
 654         larval = ERR_PTR(-EAGAIN);
 655         for (spawn = inst->spawns; spawn;) {
 656                 struct crypto_spawn *next;
 657
 658                 if (spawn->dead)
 659                         goto unlock;
 660
 661                 next = spawn->next;
 662                 spawn->inst = inst;
 663                 spawn->registered = true;
 664
 665                 fips_internal |= spawn->alg->cra_flags;
 666
 667                 crypto_mod_put(spawn->alg);
 668
 669                 spawn = next;
 670         }
 671
 672         inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
 673
 674         larval = __crypto_register_alg(&inst->alg, &algs_to_put);
 675         if (IS_ERR(larval))
 676                 goto unlock;
 677         else if (larval)
 678                 larval->test_started = true;
 679
 680         hlist_add_head(&inst->list, &tmpl->instances);
 681         inst->tmpl = tmpl;
 682
 683 unlock:
 684         up_write(&crypto_alg_sem);
 685
 686         if (IS_ERR(larval))
 687                 return PTR_ERR(larval);
 688         if (larval)
 689                 crypto_wait_for_test(larval);
 690         crypto_remove_final(&algs_to_put);
 691         return 0;
 692 }
 693 EXPORT_SYMBOL_GPL(crypto_register_instance);
 694
 695 void crypto_unregister_instance(struct crypto_instance *inst)
 696 {
 697         LIST_HEAD(list);
 698
 699         down_write(&crypto_alg_sem);
 700
 701         crypto_remove_spawns(&inst->alg, &list, NULL);
 702         crypto_remove_instance(inst, &list);
 703
 704         up_write(&crypto_alg_sem);
 705
 706         crypto_remove_final(&list);
 707 }
 708 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 709
 710 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
 711                       const char *name, u32 type, u32 mask)
 712 {
 713         struct crypto_alg *alg;
 714         int err = -EAGAIN;
 715
 716         if (WARN_ON_ONCE(inst == NULL))
 717                 return -EINVAL;
 718
 719         /* Allow the result of crypto_attr_alg_name() to be passed directly */
 720         if (IS_ERR(name))
 721                 return PTR_ERR(name);
 722
 723         alg = crypto_find_alg(name, spawn->frontend,
 724                               type | CRYPTO_ALG_FIPS_INTERNAL, mask);
 725         if (IS_ERR(alg))
 726                 return PTR_ERR(alg);
 727
 728         down_write(&crypto_alg_sem);
 729         if (!crypto_is_moribund(alg)) {
 730                 list_add(&spawn->list, &alg->cra_users);
 731                 spawn->alg = alg;
 732                 spawn->mask = mask;
 733                 spawn->next = inst->spawns;
 734                 inst->spawns = spawn;
 735                 inst->alg.cra_flags |=
 736                         (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
 737                 err = 0;
 738         }
 739         up_write(&crypto_alg_sem);
 740         if (err)
 741                 crypto_mod_put(alg);
 742         return err;
 743 }
 744 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 745
 746 void crypto_drop_spawn(struct crypto_spawn *spawn)
 747 {
 748         if (!spawn->alg) /* not yet initialized? */
 749                 return;
 750
 751         down_write(&crypto_alg_sem);
 752         if (!spawn->dead)
 753                 list_del(&spawn->list);
 754         up_write(&crypto_alg_sem);
 755
 756         if (!spawn->registered)
 757                 crypto_mod_put(spawn->alg);
 758 }
 759 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 760
 761 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 762 {
 763         struct crypto_alg *alg = ERR_PTR(-EAGAIN);
 764         struct crypto_alg *target;
 765         bool shoot = false;
 766
 767         down_read(&crypto_alg_sem);
 768         if (!spawn->dead) {
 769                 alg = spawn->alg;
 770                 if (!crypto_mod_get(alg)) {
 771                         target = crypto_alg_get(alg);
 772                         shoot = true;
 773                         alg = ERR_PTR(-EAGAIN);
 774                 }
 775         }
 776         up_read(&crypto_alg_sem);
 777
 778         if (shoot) {
 779                 crypto_shoot_alg(target);
 780                 crypto_alg_put(target);
 781         }
 782
 783         return alg;
 784 }
 785
 786 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 787                                     u32 mask)
 788 {
 789         struct crypto_alg *alg;
 790         struct crypto_tfm *tfm;
 791
 792         alg = crypto_spawn_alg(spawn);
 793         if (IS_ERR(alg))
 794                 return ERR_CAST(alg);
 795
 796         tfm = ERR_PTR(-EINVAL);
 797         if (unlikely((alg->cra_flags ^ type) & mask))
 798                 goto out_put_alg;
 799
 800         tfm = __crypto_alloc_tfm(alg, type, mask);
 801         if (IS_ERR(tfm))
 802                 goto out_put_alg;
 803
 804         return tfm;
 805
 806 out_put_alg:
 807         crypto_mod_put(alg);
 808         return tfm;
 809 }
 810 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 811
 812 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 813 {
 814         struct crypto_alg *alg;
 815         struct crypto_tfm *tfm;
 816
 817         alg = crypto_spawn_alg(spawn);
 818         if (IS_ERR(alg))
 819                 return ERR_CAST(alg);
 820
 821         tfm = crypto_create_tfm(alg, spawn->frontend);
 822         if (IS_ERR(tfm))
 823                 goto out_put_alg;
 824
 825         return tfm;
 826
 827 out_put_alg:
 828         crypto_mod_put(alg);
 829         return tfm;
 830 }
 831 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 832
 833 int crypto_register_notifier(struct notifier_block *nb)
 834 {
 835         return blocking_notifier_chain_register(&crypto_chain, nb);
 836 }
 837 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 838
 839 int crypto_unregister_notifier(struct notifier_block *nb)
 840 {
 841         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 842 }
 843 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 844
 845 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 846 {
 847         struct rtattr *rta = tb[0];
 848         struct crypto_attr_type *algt;
 849
 850         if (!rta)
 851                 return ERR_PTR(-ENOENT);
 852         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 853                 return ERR_PTR(-EINVAL);
 854         if (rta->rta_type != CRYPTOA_TYPE)
 855                 return ERR_PTR(-EINVAL);
 856
 857         algt = RTA_DATA(rta);
 858
 859         return algt;
 860 }
 861 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 862
 863 /**
 864  * crypto_check_attr_type() - check algorithm type and compute inherited mask
 865  * @tb: the template parameters
 866  * @type: the algorithm type the template would be instantiated as
 867  * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
 868  *            to restrict the flags of any inner algorithms
 869  *
 870  * Validate that the algorithm type the user requested is compatible with the
 871  * one the template would actually be instantiated as.  E.g., if the user is
 872  * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
 873  * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
 874  *
 875  * Also compute the mask to use to restrict the flags of any inner algorithms.
 876  *
 877  * Return: 0 on success; -errno on failure
 878  */
 879 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
 880 {
 881         struct crypto_attr_type *algt;
 882
 883         algt = crypto_get_attr_type(tb);
 884         if (IS_ERR(algt))
 885                 return PTR_ERR(algt);
 886
 887         if ((algt->type ^ type) & algt->mask)
 888                 return -EINVAL;
 889
 890         *mask_ret = crypto_algt_inherited_mask(algt);
 891         return 0;
 892 }
 893 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 894
 895 const char *crypto_attr_alg_name(struct rtattr *rta)
 896 {
 897         struct crypto_attr_alg *alga;
 898
 899         if (!rta)
 900                 return ERR_PTR(-ENOENT);
 901         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 902                 return ERR_PTR(-EINVAL);
 903         if (rta->rta_type != CRYPTOA_ALG)
 904                 return ERR_PTR(-EINVAL);
 905
 906         alga = RTA_DATA(rta);
 907         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 908
 909         return alga->name;
 910 }
 911 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 912
 913 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 914                         struct crypto_alg *alg)
 915 {
 916         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 917                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 918                 return -ENAMETOOLONG;
 919
 920         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 921                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 922                 return -ENAMETOOLONG;
 923
 924         return 0;
 925 }
 926 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 927
 928 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 929 {
 930         INIT_LIST_HEAD(&queue->list);
 931         queue->backlog = &queue->list;
 932         queue->qlen = 0;
 933         queue->max_qlen = max_qlen;
 934 }
 935 EXPORT_SYMBOL_GPL(crypto_init_queue);
 936
 937 int crypto_enqueue_request(struct crypto_queue *queue,
 938                            struct crypto_async_request *request)
 939 {
 940         int err = -EINPROGRESS;
 941
 942         if (unlikely(queue->qlen >= queue->max_qlen)) {
 943                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 944                         err = -ENOSPC;
 945                         goto out;
 946                 }
 947                 err = -EBUSY;
 948                 if (queue->backlog == &queue->list)
 949                         queue->backlog = &request->list;
 950         }
 951
 952         queue->qlen++;
 953         list_add_tail(&request->list, &queue->list);
 954
 955 out:
 956         return err;
 957 }
 958 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 959
 960 void crypto_enqueue_request_head(struct crypto_queue *queue,
 961                                  struct crypto_async_request *request)
 962 {
 963         queue->qlen++;
 964         list_add(&request->list, &queue->list);
 965 }
 966 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
 967
 968 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 969 {
 970         struct list_head *request;
 971
 972         if (unlikely(!queue->qlen))
 973                 return NULL;
 974
 975         queue->qlen--;
 976
 977         if (queue->backlog != &queue->list)
 978                 queue->backlog = queue->backlog->next;
 979
 980         request = queue->list.next;
 981         list_del(request);
 982
 983         return list_entry(request, struct crypto_async_request, list);
 984 }
 985 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 986
 987 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 988 {
 989         u8 *b = (a + size);
 990         u8 c;
 991
 992         for (; size; size--) {
 993                 c = *--b + 1;
 994                 *b = c;
 995                 if (c)
 996                         break;
 997         }
 998 }
 999
1000 void crypto_inc(u8 *a, unsigned int size)
1001 {
1002         __be32 *b = (__be32 *)(a + size);
1003         u32 c;
1004
1005         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1006             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1007                 for (; size >= 4; size -= 4) {
1008                         c = be32_to_cpu(*--b) + 1;
1009                         *b = cpu_to_be32(c);
1010                         if (likely(c))
1011                                 return;
1012                 }
1013
1014         crypto_inc_byte(a, size);
1015 }
1016 EXPORT_SYMBOL_GPL(crypto_inc);
1017
1018 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1019 {
1020         return alg->cra_ctxsize +
1021                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1022 }
1023 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1024
1025 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1026                         u32 type, u32 mask)
1027 {
1028         int ret = 0;
1029         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1030
1031         if (!IS_ERR(alg)) {
1032                 crypto_mod_put(alg);
1033                 ret = 1;
1034         }
1035
1036         return ret;
1037 }
1038 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1039
1040 #ifdef CONFIG_CRYPTO_STATS
1041 void crypto_stats_init(struct crypto_alg *alg)
1042 {
1043         memset(&alg->stats, 0, sizeof(alg->stats));
1044 }
1045 EXPORT_SYMBOL_GPL(crypto_stats_init);
1046
1047 void crypto_stats_get(struct crypto_alg *alg)
1048 {
1049         crypto_alg_get(alg);
1050 }
1051 EXPORT_SYMBOL_GPL(crypto_stats_get);
1052
1053 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1054                                int ret)
1055 {
1056         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1057                 atomic64_inc(&alg->stats.aead.err_cnt);
1058         } else {
1059                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1060                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1061         }
1062         crypto_alg_put(alg);
1063 }
1064 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1065
1066 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1067                                int ret)
1068 {
1069         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1070                 atomic64_inc(&alg->stats.aead.err_cnt);
1071         } else {
1072                 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1073                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1074         }
1075         crypto_alg_put(alg);
1076 }
1077 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1078
1079 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1080                                    struct crypto_alg *alg)
1081 {
1082         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1083                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1084         } else {
1085                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1086                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1087         }
1088         crypto_alg_put(alg);
1089 }
1090 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1091
1092 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1093                                    struct crypto_alg *alg)
1094 {
1095         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1096                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1097         } else {
1098                 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1099                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1100         }
1101         crypto_alg_put(alg);
1102 }
1103 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1104
1105 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1106 {
1107         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1108                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1109         else
1110                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1111         crypto_alg_put(alg);
1112 }
1113 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1114
1115 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1116 {
1117         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1118                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1119         else
1120                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1121         crypto_alg_put(alg);
1122 }
1123 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1124
1125 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1126 {
1127         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1128                 atomic64_inc(&alg->stats.compress.err_cnt);
1129         } else {
1130                 atomic64_inc(&alg->stats.compress.compress_cnt);
1131                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1132         }
1133         crypto_alg_put(alg);
1134 }
1135 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1136
1137 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1138 {
1139         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1140                 atomic64_inc(&alg->stats.compress.err_cnt);
1141         } else {
1142                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1143                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1144         }
1145         crypto_alg_put(alg);
1146 }
1147 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1148
1149 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1150                                struct crypto_alg *alg)
1151 {
1152         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1153                 atomic64_inc(&alg->stats.hash.err_cnt);
1154         else
1155                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1156         crypto_alg_put(alg);
1157 }
1158 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1159
1160 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1161                               struct crypto_alg *alg)
1162 {
1163         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1164                 atomic64_inc(&alg->stats.hash.err_cnt);
1165         } else {
1166                 atomic64_inc(&alg->stats.hash.hash_cnt);
1167                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1168         }
1169         crypto_alg_put(alg);
1170 }
1171 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1172
1173 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1174 {
1175         if (ret)
1176                 atomic64_inc(&alg->stats.kpp.err_cnt);
1177         else
1178                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1179         crypto_alg_put(alg);
1180 }
1181 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1182
1183 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1184 {
1185         if (ret)
1186                 atomic64_inc(&alg->stats.kpp.err_cnt);
1187         else
1188                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1189         crypto_alg_put(alg);
1190 }
1191 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1192
1193 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1194 {
1195         if (ret)
1196                 atomic64_inc(&alg->stats.kpp.err_cnt);
1197         else
1198                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1199         crypto_alg_put(alg);
1200 }
1201 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1202
1203 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1204 {
1205         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1206                 atomic64_inc(&alg->stats.rng.err_cnt);
1207         else
1208                 atomic64_inc(&alg->stats.rng.seed_cnt);
1209         crypto_alg_put(alg);
1210 }
1211 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1212
1213 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1214                                int ret)
1215 {
1216         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1217                 atomic64_inc(&alg->stats.rng.err_cnt);
1218         } else {
1219                 atomic64_inc(&alg->stats.rng.generate_cnt);
1220                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1221         }
1222         crypto_alg_put(alg);
1223 }
1224 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1225
1226 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1227                                    struct crypto_alg *alg)
1228 {
1229         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1230                 atomic64_inc(&alg->stats.cipher.err_cnt);
1231         } else {
1232                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1233                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1234         }
1235         crypto_alg_put(alg);
1236 }
1237 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1238
1239 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1240                                    struct crypto_alg *alg)
1241 {
1242         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1243                 atomic64_inc(&alg->stats.cipher.err_cnt);
1244         } else {
1245                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1246                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1247         }
1248         crypto_alg_put(alg);
1249 }
1250 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1251 #endif
1252
1253 static void __init crypto_start_tests(void)
1254 {
1255         for (;;) {
1256                 struct crypto_larval *larval = NULL;
1257                 struct crypto_alg *q;
1258
1259                 down_write(&crypto_alg_sem);
1260
1261                 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1262                         struct crypto_larval *l;
1263
1264                         if (!crypto_is_larval(q))
1265                                 continue;
1266
1267                         l = (void *)q;
1268
1269                         if (!crypto_is_test_larval(l))
1270                                 continue;
1271
1272                         if (l->test_started)
1273                                 continue;
1274
1275                         l->test_started = true;
1276                         larval = l;
1277                         break;
1278                 }
1279
1280                 up_write(&crypto_alg_sem);
1281
1282                 if (!larval)
1283                         break;
1284
1285                 crypto_wait_for_test(larval);
1286         }
1287
1288         static_branch_enable(&crypto_boot_test_finished);
1289 }
1290
1291 static int __init crypto_algapi_init(void)
1292 {
1293         crypto_init_proc();
1294         crypto_start_tests();
1295         return 0;
1296 }
1297
1298 static void __exit crypto_algapi_exit(void)
1299 {
1300         crypto_exit_proc();
1301 }
1302
1303 /*
1304  * We run this at late_initcall so that all the built-in algorithms
1305  * have had a chance to register themselves first.
1306  */
1307 late_initcall(crypto_algapi_init);
1308 module_exit(crypto_algapi_exit);
1309
1310 MODULE_LICENSE("GPL");
1311 MODULE_DESCRIPTION("Cryptographic algorithms API");
1312 MODULE_SOFTDEP("pre: cryptomgr");