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 struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
 226 {
 227         struct crypto_larval *larval;
 228
 229         if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER))
 230                 return NULL;
 231
 232         larval = crypto_larval_alloc(alg->cra_name,
 233                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 234         if (IS_ERR(larval))
 235                 return larval;
 236
 237         larval->adult = crypto_mod_get(alg);
 238         if (!larval->adult) {
 239                 kfree(larval);
 240                 return ERR_PTR(-ENOENT);
 241         }
 242
 243         refcount_set(&larval->alg.cra_refcnt, 1);
 244         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 245                CRYPTO_MAX_ALG_NAME);
 246         larval->alg.cra_priority = alg->cra_priority;
 247
 248         return larval;
 249 }
 250
 251 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 252 {
 253         struct crypto_alg *q;
 254         struct crypto_larval *larval;
 255         int ret = -EAGAIN;
 256
 257         if (crypto_is_dead(alg))
 258                 goto err;
 259
 260         INIT_LIST_HEAD(&alg->cra_users);
 261
 262         /* No cheating! */
 263         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 264
 265         ret = -EEXIST;
 266
 267         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 268                 if (q == alg)
 269                         goto err;
 270
 271                 if (crypto_is_moribund(q))
 272                         continue;
 273
 274                 if (crypto_is_larval(q)) {
 275                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 276                                 goto err;
 277                         continue;
 278                 }
 279
 280                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 281                     !strcmp(q->cra_name, alg->cra_driver_name))
 282                         goto err;
 283         }
 284
 285         larval = crypto_alloc_test_larval(alg);
 286         if (IS_ERR(larval))
 287                 goto out;
 288
 289         list_add(&alg->cra_list, &crypto_alg_list);
 290
 291         if (larval)
 292                 list_add(&larval->alg.cra_list, &crypto_alg_list);
 293         else
 294                 alg->cra_flags |= CRYPTO_ALG_TESTED;
 295
 296         crypto_stats_init(alg);
 297
 298 out:
 299         return larval;
 300
 301 err:
 302         larval = ERR_PTR(ret);
 303         goto out;
 304 }
 305
 306 void crypto_alg_tested(const char *name, int err)
 307 {
 308         struct crypto_larval *test;
 309         struct crypto_alg *alg;
 310         struct crypto_alg *q;
 311         LIST_HEAD(list);
 312         bool best;
 313
 314         down_write(&crypto_alg_sem);
 315         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 316                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 317                         continue;
 318
 319                 test = (struct crypto_larval *)q;
 320
 321                 if (!strcmp(q->cra_driver_name, name))
 322                         goto found;
 323         }
 324
 325         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 326         goto unlock;
 327
 328 found:
 329         q->cra_flags |= CRYPTO_ALG_DEAD;
 330         alg = test->adult;
 331
 332         if (list_empty(&alg->cra_list))
 333                 goto complete;
 334
 335         if (err == -ECANCELED)
 336                 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
 337         else if (err)
 338                 goto complete;
 339         else
 340                 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
 341
 342         alg->cra_flags |= CRYPTO_ALG_TESTED;
 343
 344         /* Only satisfy larval waiters if we are the best. */
 345         best = true;
 346         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 347                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 348                         continue;
 349
 350                 if (strcmp(alg->cra_name, q->cra_name))
 351                         continue;
 352
 353                 if (q->cra_priority > alg->cra_priority) {
 354                         best = false;
 355                         break;
 356                 }
 357         }
 358
 359         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 360                 if (q == alg)
 361                         continue;
 362
 363                 if (crypto_is_moribund(q))
 364                         continue;
 365
 366                 if (crypto_is_larval(q)) {
 367                         struct crypto_larval *larval = (void *)q;
 368
 369                         /*
 370                          * Check to see if either our generic name or
 371                          * specific name can satisfy the name requested
 372                          * by the larval entry q.
 373                          */
 374                         if (strcmp(alg->cra_name, q->cra_name) &&
 375                             strcmp(alg->cra_driver_name, q->cra_name))
 376                                 continue;
 377
 378                         if (larval->adult)
 379                                 continue;
 380                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 381                                 continue;
 382
 383                         if (best && crypto_mod_get(alg))
 384                                 larval->adult = alg;
 385                         else
 386                                 larval->adult = ERR_PTR(-EAGAIN);
 387
 388                         continue;
 389                 }
 390
 391                 if (strcmp(alg->cra_name, q->cra_name))
 392                         continue;
 393
 394                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 395                     q->cra_priority > alg->cra_priority)
 396                         continue;
 397
 398                 crypto_remove_spawns(q, &list, alg);
 399         }
 400
 401 complete:
 402         complete_all(&test->completion);
 403
 404 unlock:
 405         up_write(&crypto_alg_sem);
 406
 407         crypto_remove_final(&list);
 408 }
 409 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 410
 411 void crypto_remove_final(struct list_head *list)
 412 {
 413         struct crypto_alg *alg;
 414         struct crypto_alg *n;
 415
 416         list_for_each_entry_safe(alg, n, list, cra_list) {
 417                 list_del_init(&alg->cra_list);
 418                 crypto_alg_put(alg);
 419         }
 420 }
 421 EXPORT_SYMBOL_GPL(crypto_remove_final);
 422
 423 int crypto_register_alg(struct crypto_alg *alg)
 424 {
 425         struct crypto_larval *larval;
 426         bool test_started;
 427         int err;
 428
 429         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 430         err = crypto_check_alg(alg);
 431         if (err)
 432                 return err;
 433
 434         down_write(&crypto_alg_sem);
 435         larval = __crypto_register_alg(alg);
 436         test_started = static_key_enabled(&crypto_boot_test_finished);
 437         if (!IS_ERR_OR_NULL(larval))
 438                 larval->test_started = test_started;
 439         up_write(&crypto_alg_sem);
 440
 441         if (IS_ERR_OR_NULL(larval))
 442                 return PTR_ERR(larval);
 443
 444         if (test_started)
 445                 crypto_wait_for_test(larval);
 446         return 0;
 447 }
 448 EXPORT_SYMBOL_GPL(crypto_register_alg);
 449
 450 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 451 {
 452         if (unlikely(list_empty(&alg->cra_list)))
 453                 return -ENOENT;
 454
 455         alg->cra_flags |= CRYPTO_ALG_DEAD;
 456
 457         list_del_init(&alg->cra_list);
 458         crypto_remove_spawns(alg, list, NULL);
 459
 460         return 0;
 461 }
 462
 463 void crypto_unregister_alg(struct crypto_alg *alg)
 464 {
 465         int ret;
 466         LIST_HEAD(list);
 467
 468         down_write(&crypto_alg_sem);
 469         ret = crypto_remove_alg(alg, &list);
 470         up_write(&crypto_alg_sem);
 471
 472         if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
 473                 return;
 474
 475         if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
 476                 return;
 477
 478         if (alg->cra_destroy)
 479                 alg->cra_destroy(alg);
 480
 481         crypto_remove_final(&list);
 482 }
 483 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 484
 485 int crypto_register_algs(struct crypto_alg *algs, int count)
 486 {
 487         int i, ret;
 488
 489         for (i = 0; i < count; i++) {
 490                 ret = crypto_register_alg(&algs[i]);
 491                 if (ret)
 492                         goto err;
 493         }
 494
 495         return 0;
 496
 497 err:
 498         for (--i; i >= 0; --i)
 499                 crypto_unregister_alg(&algs[i]);
 500
 501         return ret;
 502 }
 503 EXPORT_SYMBOL_GPL(crypto_register_algs);
 504
 505 void crypto_unregister_algs(struct crypto_alg *algs, int count)
 506 {
 507         int i;
 508
 509         for (i = 0; i < count; i++)
 510                 crypto_unregister_alg(&algs[i]);
 511 }
 512 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 513
 514 int crypto_register_template(struct crypto_template *tmpl)
 515 {
 516         struct crypto_template *q;
 517         int err = -EEXIST;
 518
 519         down_write(&crypto_alg_sem);
 520
 521         crypto_check_module_sig(tmpl->module);
 522
 523         list_for_each_entry(q, &crypto_template_list, list) {
 524                 if (q == tmpl)
 525                         goto out;
 526         }
 527
 528         list_add(&tmpl->list, &crypto_template_list);
 529         err = 0;
 530 out:
 531         up_write(&crypto_alg_sem);
 532         return err;
 533 }
 534 EXPORT_SYMBOL_GPL(crypto_register_template);
 535
 536 int crypto_register_templates(struct crypto_template *tmpls, int count)
 537 {
 538         int i, err;
 539
 540         for (i = 0; i < count; i++) {
 541                 err = crypto_register_template(&tmpls[i]);
 542                 if (err)
 543                         goto out;
 544         }
 545         return 0;
 546
 547 out:
 548         for (--i; i >= 0; --i)
 549                 crypto_unregister_template(&tmpls[i]);
 550         return err;
 551 }
 552 EXPORT_SYMBOL_GPL(crypto_register_templates);
 553
 554 void crypto_unregister_template(struct crypto_template *tmpl)
 555 {
 556         struct crypto_instance *inst;
 557         struct hlist_node *n;
 558         struct hlist_head *list;
 559         LIST_HEAD(users);
 560
 561         down_write(&crypto_alg_sem);
 562
 563         BUG_ON(list_empty(&tmpl->list));
 564         list_del_init(&tmpl->list);
 565
 566         list = &tmpl->instances;
 567         hlist_for_each_entry(inst, list, list) {
 568                 int err = crypto_remove_alg(&inst->alg, &users);
 569
 570                 BUG_ON(err);
 571         }
 572
 573         up_write(&crypto_alg_sem);
 574
 575         hlist_for_each_entry_safe(inst, n, list, list) {
 576                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 577                 crypto_free_instance(inst);
 578         }
 579         crypto_remove_final(&users);
 580 }
 581 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 582
 583 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
 584 {
 585         int i;
 586
 587         for (i = count - 1; i >= 0; --i)
 588                 crypto_unregister_template(&tmpls[i]);
 589 }
 590 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
 591
 592 static struct crypto_template *__crypto_lookup_template(const char *name)
 593 {
 594         struct crypto_template *q, *tmpl = NULL;
 595
 596         down_read(&crypto_alg_sem);
 597         list_for_each_entry(q, &crypto_template_list, list) {
 598                 if (strcmp(q->name, name))
 599                         continue;
 600                 if (unlikely(!crypto_tmpl_get(q)))
 601                         continue;
 602
 603                 tmpl = q;
 604                 break;
 605         }
 606         up_read(&crypto_alg_sem);
 607
 608         return tmpl;
 609 }
 610
 611 struct crypto_template *crypto_lookup_template(const char *name)
 612 {
 613         return try_then_request_module(__crypto_lookup_template(name),
 614                                        "crypto-%s", name);
 615 }
 616 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 617
 618 int crypto_register_instance(struct crypto_template *tmpl,
 619                              struct crypto_instance *inst)
 620 {
 621         struct crypto_larval *larval;
 622         struct crypto_spawn *spawn;
 623         u32 fips_internal = 0;
 624         int err;
 625
 626         err = crypto_check_alg(&inst->alg);
 627         if (err)
 628                 return err;
 629
 630         inst->alg.cra_module = tmpl->module;
 631         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 632
 633         down_write(&crypto_alg_sem);
 634
 635         larval = ERR_PTR(-EAGAIN);
 636         for (spawn = inst->spawns; spawn;) {
 637                 struct crypto_spawn *next;
 638
 639                 if (spawn->dead)
 640                         goto unlock;
 641
 642                 next = spawn->next;
 643                 spawn->inst = inst;
 644                 spawn->registered = true;
 645
 646                 fips_internal |= spawn->alg->cra_flags;
 647
 648                 crypto_mod_put(spawn->alg);
 649
 650                 spawn = next;
 651         }
 652
 653         inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
 654
 655         larval = __crypto_register_alg(&inst->alg);
 656         if (IS_ERR(larval))
 657                 goto unlock;
 658         else if (larval)
 659                 larval->test_started = true;
 660
 661         hlist_add_head(&inst->list, &tmpl->instances);
 662         inst->tmpl = tmpl;
 663
 664 unlock:
 665         up_write(&crypto_alg_sem);
 666
 667         err = PTR_ERR(larval);
 668         if (IS_ERR_OR_NULL(larval))
 669                 goto err;
 670
 671         crypto_wait_for_test(larval);
 672         err = 0;
 673
 674 err:
 675         return err;
 676 }
 677 EXPORT_SYMBOL_GPL(crypto_register_instance);
 678
 679 void crypto_unregister_instance(struct crypto_instance *inst)
 680 {
 681         LIST_HEAD(list);
 682
 683         down_write(&crypto_alg_sem);
 684
 685         crypto_remove_spawns(&inst->alg, &list, NULL);
 686         crypto_remove_instance(inst, &list);
 687
 688         up_write(&crypto_alg_sem);
 689
 690         crypto_remove_final(&list);
 691 }
 692 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 693
 694 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
 695                       const char *name, u32 type, u32 mask)
 696 {
 697         struct crypto_alg *alg;
 698         int err = -EAGAIN;
 699
 700         if (WARN_ON_ONCE(inst == NULL))
 701                 return -EINVAL;
 702
 703         /* Allow the result of crypto_attr_alg_name() to be passed directly */
 704         if (IS_ERR(name))
 705                 return PTR_ERR(name);
 706
 707         alg = crypto_find_alg(name, spawn->frontend,
 708                               type | CRYPTO_ALG_FIPS_INTERNAL, mask);
 709         if (IS_ERR(alg))
 710                 return PTR_ERR(alg);
 711
 712         down_write(&crypto_alg_sem);
 713         if (!crypto_is_moribund(alg)) {
 714                 list_add(&spawn->list, &alg->cra_users);
 715                 spawn->alg = alg;
 716                 spawn->mask = mask;
 717                 spawn->next = inst->spawns;
 718                 inst->spawns = spawn;
 719                 inst->alg.cra_flags |=
 720                         (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
 721                 err = 0;
 722         }
 723         up_write(&crypto_alg_sem);
 724         if (err)
 725                 crypto_mod_put(alg);
 726         return err;
 727 }
 728 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 729
 730 void crypto_drop_spawn(struct crypto_spawn *spawn)
 731 {
 732         if (!spawn->alg) /* not yet initialized? */
 733                 return;
 734
 735         down_write(&crypto_alg_sem);
 736         if (!spawn->dead)
 737                 list_del(&spawn->list);
 738         up_write(&crypto_alg_sem);
 739
 740         if (!spawn->registered)
 741                 crypto_mod_put(spawn->alg);
 742 }
 743 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 744
 745 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 746 {
 747         struct crypto_alg *alg = ERR_PTR(-EAGAIN);
 748         struct crypto_alg *target;
 749         bool shoot = false;
 750
 751         down_read(&crypto_alg_sem);
 752         if (!spawn->dead) {
 753                 alg = spawn->alg;
 754                 if (!crypto_mod_get(alg)) {
 755                         target = crypto_alg_get(alg);
 756                         shoot = true;
 757                         alg = ERR_PTR(-EAGAIN);
 758                 }
 759         }
 760         up_read(&crypto_alg_sem);
 761
 762         if (shoot) {
 763                 crypto_shoot_alg(target);
 764                 crypto_alg_put(target);
 765         }
 766
 767         return alg;
 768 }
 769
 770 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 771                                     u32 mask)
 772 {
 773         struct crypto_alg *alg;
 774         struct crypto_tfm *tfm;
 775
 776         alg = crypto_spawn_alg(spawn);
 777         if (IS_ERR(alg))
 778                 return ERR_CAST(alg);
 779
 780         tfm = ERR_PTR(-EINVAL);
 781         if (unlikely((alg->cra_flags ^ type) & mask))
 782                 goto out_put_alg;
 783
 784         tfm = __crypto_alloc_tfm(alg, type, mask);
 785         if (IS_ERR(tfm))
 786                 goto out_put_alg;
 787
 788         return tfm;
 789
 790 out_put_alg:
 791         crypto_mod_put(alg);
 792         return tfm;
 793 }
 794 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 795
 796 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 797 {
 798         struct crypto_alg *alg;
 799         struct crypto_tfm *tfm;
 800
 801         alg = crypto_spawn_alg(spawn);
 802         if (IS_ERR(alg))
 803                 return ERR_CAST(alg);
 804
 805         tfm = crypto_create_tfm(alg, spawn->frontend);
 806         if (IS_ERR(tfm))
 807                 goto out_put_alg;
 808
 809         return tfm;
 810
 811 out_put_alg:
 812         crypto_mod_put(alg);
 813         return tfm;
 814 }
 815 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 816
 817 int crypto_register_notifier(struct notifier_block *nb)
 818 {
 819         return blocking_notifier_chain_register(&crypto_chain, nb);
 820 }
 821 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 822
 823 int crypto_unregister_notifier(struct notifier_block *nb)
 824 {
 825         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 826 }
 827 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 828
 829 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 830 {
 831         struct rtattr *rta = tb[0];
 832         struct crypto_attr_type *algt;
 833
 834         if (!rta)
 835                 return ERR_PTR(-ENOENT);
 836         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 837                 return ERR_PTR(-EINVAL);
 838         if (rta->rta_type != CRYPTOA_TYPE)
 839                 return ERR_PTR(-EINVAL);
 840
 841         algt = RTA_DATA(rta);
 842
 843         return algt;
 844 }
 845 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 846
 847 /**
 848  * crypto_check_attr_type() - check algorithm type and compute inherited mask
 849  * @tb: the template parameters
 850  * @type: the algorithm type the template would be instantiated as
 851  * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
 852  *            to restrict the flags of any inner algorithms
 853  *
 854  * Validate that the algorithm type the user requested is compatible with the
 855  * one the template would actually be instantiated as.  E.g., if the user is
 856  * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
 857  * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
 858  *
 859  * Also compute the mask to use to restrict the flags of any inner algorithms.
 860  *
 861  * Return: 0 on success; -errno on failure
 862  */
 863 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
 864 {
 865         struct crypto_attr_type *algt;
 866
 867         algt = crypto_get_attr_type(tb);
 868         if (IS_ERR(algt))
 869                 return PTR_ERR(algt);
 870
 871         if ((algt->type ^ type) & algt->mask)
 872                 return -EINVAL;
 873
 874         *mask_ret = crypto_algt_inherited_mask(algt);
 875         return 0;
 876 }
 877 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 878
 879 const char *crypto_attr_alg_name(struct rtattr *rta)
 880 {
 881         struct crypto_attr_alg *alga;
 882
 883         if (!rta)
 884                 return ERR_PTR(-ENOENT);
 885         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 886                 return ERR_PTR(-EINVAL);
 887         if (rta->rta_type != CRYPTOA_ALG)
 888                 return ERR_PTR(-EINVAL);
 889
 890         alga = RTA_DATA(rta);
 891         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 892
 893         return alga->name;
 894 }
 895 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 896
 897 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 898                         struct crypto_alg *alg)
 899 {
 900         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 901                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 902                 return -ENAMETOOLONG;
 903
 904         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 905                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 906                 return -ENAMETOOLONG;
 907
 908         return 0;
 909 }
 910 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 911
 912 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 913 {
 914         INIT_LIST_HEAD(&queue->list);
 915         queue->backlog = &queue->list;
 916         queue->qlen = 0;
 917         queue->max_qlen = max_qlen;
 918 }
 919 EXPORT_SYMBOL_GPL(crypto_init_queue);
 920
 921 int crypto_enqueue_request(struct crypto_queue *queue,
 922                            struct crypto_async_request *request)
 923 {
 924         int err = -EINPROGRESS;
 925
 926         if (unlikely(queue->qlen >= queue->max_qlen)) {
 927                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 928                         err = -ENOSPC;
 929                         goto out;
 930                 }
 931                 err = -EBUSY;
 932                 if (queue->backlog == &queue->list)
 933                         queue->backlog = &request->list;
 934         }
 935
 936         queue->qlen++;
 937         list_add_tail(&request->list, &queue->list);
 938
 939 out:
 940         return err;
 941 }
 942 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 943
 944 void crypto_enqueue_request_head(struct crypto_queue *queue,
 945                                  struct crypto_async_request *request)
 946 {
 947         if (unlikely(queue->qlen >= queue->max_qlen))
 948                 queue->backlog = queue->backlog->prev;
 949
 950         queue->qlen++;
 951         list_add(&request->list, &queue->list);
 952 }
 953 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
 954
 955 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 956 {
 957         struct list_head *request;
 958
 959         if (unlikely(!queue->qlen))
 960                 return NULL;
 961
 962         queue->qlen--;
 963
 964         if (queue->backlog != &queue->list)
 965                 queue->backlog = queue->backlog->next;
 966
 967         request = queue->list.next;
 968         list_del(request);
 969
 970         return list_entry(request, struct crypto_async_request, list);
 971 }
 972 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 973
 974 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 975 {
 976         u8 *b = (a + size);
 977         u8 c;
 978
 979         for (; size; size--) {
 980                 c = *--b + 1;
 981                 *b = c;
 982                 if (c)
 983                         break;
 984         }
 985 }
 986
 987 void crypto_inc(u8 *a, unsigned int size)
 988 {
 989         __be32 *b = (__be32 *)(a + size);
 990         u32 c;
 991
 992         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 993             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 994                 for (; size >= 4; size -= 4) {
 995                         c = be32_to_cpu(*--b) + 1;
 996                         *b = cpu_to_be32(c);
 997                         if (likely(c))
 998                                 return;
 999                 }
1000
1001         crypto_inc_byte(a, size);
1002 }
1003 EXPORT_SYMBOL_GPL(crypto_inc);
1004
1005 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1006 {
1007         return alg->cra_ctxsize +
1008                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1009 }
1010 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1011
1012 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1013                         u32 type, u32 mask)
1014 {
1015         int ret = 0;
1016         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1017
1018         if (!IS_ERR(alg)) {
1019                 crypto_mod_put(alg);
1020                 ret = 1;
1021         }
1022
1023         return ret;
1024 }
1025 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1026
1027 #ifdef CONFIG_CRYPTO_STATS
1028 void crypto_stats_init(struct crypto_alg *alg)
1029 {
1030         memset(&alg->stats, 0, sizeof(alg->stats));
1031 }
1032 EXPORT_SYMBOL_GPL(crypto_stats_init);
1033
1034 void crypto_stats_get(struct crypto_alg *alg)
1035 {
1036         crypto_alg_get(alg);
1037 }
1038 EXPORT_SYMBOL_GPL(crypto_stats_get);
1039
1040 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1041                                int ret)
1042 {
1043         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1044                 atomic64_inc(&alg->stats.aead.err_cnt);
1045         } else {
1046                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1047                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1048         }
1049         crypto_alg_put(alg);
1050 }
1051 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1052
1053 void crypto_stats_aead_decrypt(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.decrypt_cnt);
1060                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1061         }
1062         crypto_alg_put(alg);
1063 }
1064 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1065
1066 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1067                                    struct crypto_alg *alg)
1068 {
1069         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1070                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1071         } else {
1072                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1073                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1074         }
1075         crypto_alg_put(alg);
1076 }
1077 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1078
1079 void crypto_stats_akcipher_decrypt(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.decrypt_cnt);
1086                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1087         }
1088         crypto_alg_put(alg);
1089 }
1090 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1091
1092 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1093 {
1094         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1095                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1096         else
1097                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1098         crypto_alg_put(alg);
1099 }
1100 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1101
1102 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1103 {
1104         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1105                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1106         else
1107                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1108         crypto_alg_put(alg);
1109 }
1110 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1111
1112 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1113 {
1114         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1115                 atomic64_inc(&alg->stats.compress.err_cnt);
1116         } else {
1117                 atomic64_inc(&alg->stats.compress.compress_cnt);
1118                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1119         }
1120         crypto_alg_put(alg);
1121 }
1122 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1123
1124 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1125 {
1126         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1127                 atomic64_inc(&alg->stats.compress.err_cnt);
1128         } else {
1129                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1130                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1131         }
1132         crypto_alg_put(alg);
1133 }
1134 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1135
1136 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1137                                struct crypto_alg *alg)
1138 {
1139         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1140                 atomic64_inc(&alg->stats.hash.err_cnt);
1141         else
1142                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1143         crypto_alg_put(alg);
1144 }
1145 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1146
1147 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1148                               struct crypto_alg *alg)
1149 {
1150         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1151                 atomic64_inc(&alg->stats.hash.err_cnt);
1152         } else {
1153                 atomic64_inc(&alg->stats.hash.hash_cnt);
1154                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1155         }
1156         crypto_alg_put(alg);
1157 }
1158 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1159
1160 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1161 {
1162         if (ret)
1163                 atomic64_inc(&alg->stats.kpp.err_cnt);
1164         else
1165                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1166         crypto_alg_put(alg);
1167 }
1168 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1169
1170 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1171 {
1172         if (ret)
1173                 atomic64_inc(&alg->stats.kpp.err_cnt);
1174         else
1175                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1176         crypto_alg_put(alg);
1177 }
1178 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1179
1180 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1181 {
1182         if (ret)
1183                 atomic64_inc(&alg->stats.kpp.err_cnt);
1184         else
1185                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1186         crypto_alg_put(alg);
1187 }
1188 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1189
1190 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1191 {
1192         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1193                 atomic64_inc(&alg->stats.rng.err_cnt);
1194         else
1195                 atomic64_inc(&alg->stats.rng.seed_cnt);
1196         crypto_alg_put(alg);
1197 }
1198 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1199
1200 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1201                                int ret)
1202 {
1203         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1204                 atomic64_inc(&alg->stats.rng.err_cnt);
1205         } else {
1206                 atomic64_inc(&alg->stats.rng.generate_cnt);
1207                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1208         }
1209         crypto_alg_put(alg);
1210 }
1211 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1212
1213 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1214                                    struct crypto_alg *alg)
1215 {
1216         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1217                 atomic64_inc(&alg->stats.cipher.err_cnt);
1218         } else {
1219                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1220                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1221         }
1222         crypto_alg_put(alg);
1223 }
1224 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1225
1226 void crypto_stats_skcipher_decrypt(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.decrypt_cnt);
1233                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1234         }
1235         crypto_alg_put(alg);
1236 }
1237 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1238 #endif
1239
1240 static void __init crypto_start_tests(void)
1241 {
1242         for (;;) {
1243                 struct crypto_larval *larval = NULL;
1244                 struct crypto_alg *q;
1245
1246                 down_write(&crypto_alg_sem);
1247
1248                 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1249                         struct crypto_larval *l;
1250
1251                         if (!crypto_is_larval(q))
1252                                 continue;
1253
1254                         l = (void *)q;
1255
1256                         if (!crypto_is_test_larval(l))
1257                                 continue;
1258
1259                         if (l->test_started)
1260                                 continue;
1261
1262                         l->test_started = true;
1263                         larval = l;
1264                         break;
1265                 }
1266
1267                 up_write(&crypto_alg_sem);
1268
1269                 if (!larval)
1270                         break;
1271
1272                 crypto_wait_for_test(larval);
1273         }
1274
1275         static_branch_enable(&crypto_boot_test_finished);
1276 }
1277
1278 static int __init crypto_algapi_init(void)
1279 {
1280         crypto_init_proc();
1281         crypto_start_tests();
1282         return 0;
1283 }
1284
1285 static void __exit crypto_algapi_exit(void)
1286 {
1287         crypto_exit_proc();
1288 }
1289
1290 /*
1291  * We run this at late_initcall so that all the built-in algorithms
1292  * have had a chance to register themselves first.
1293  */
1294 late_initcall(crypto_algapi_init);
1295 module_exit(crypto_algapi_exit);
1296
1297 MODULE_LICENSE("GPL");
1298 MODULE_DESCRIPTION("Cryptographic algorithms API");
1299 MODULE_SOFTDEP("pre: cryptomgr");