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 = ⊤ 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 (alg->cra_flags & CRYPTO_ALG_INTERNAL)) 283 return NULL; /* No self-test needed */ 284 285 larval = crypto_larval_alloc(alg->cra_name, 286 alg->cra_flags | CRYPTO_ALG_TESTED, 0); 287 if (IS_ERR(larval)) 288 return larval; 289 290 larval->adult = crypto_mod_get(alg); 291 if (!larval->adult) { 292 kfree(larval); 293 return ERR_PTR(-ENOENT); 294 } 295 296 refcount_set(&larval->alg.cra_refcnt, 1); 297 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, 298 CRYPTO_MAX_ALG_NAME); 299 larval->alg.cra_priority = alg->cra_priority; 300 301 return larval; 302 } 303 304 static struct crypto_larval * 305 __crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put) 306 { 307 struct crypto_alg *q; 308 struct crypto_larval *larval; 309 int ret = -EAGAIN; 310 311 if (crypto_is_dead(alg)) 312 goto err; 313 314 INIT_LIST_HEAD(&alg->cra_users); 315 316 ret = -EEXIST; 317 318 list_for_each_entry(q, &crypto_alg_list, cra_list) { 319 if (q == alg) 320 goto err; 321 322 if (crypto_is_moribund(q)) 323 continue; 324 325 if (crypto_is_larval(q)) { 326 if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) 327 goto err; 328 continue; 329 } 330 331 if (!strcmp(q->cra_driver_name, alg->cra_name) || 332 !strcmp(q->cra_name, alg->cra_driver_name)) 333 goto err; 334 } 335 336 larval = crypto_alloc_test_larval(alg); 337 if (IS_ERR(larval)) 338 goto out; 339 340 list_add(&alg->cra_list, &crypto_alg_list); 341 342 if (larval) { 343 /* No cheating! */ 344 alg->cra_flags &= ~CRYPTO_ALG_TESTED; 345 346 list_add(&larval->alg.cra_list, &crypto_alg_list); 347 } else { 348 alg->cra_flags |= CRYPTO_ALG_TESTED; 349 crypto_alg_finish_registration(alg, true, algs_to_put); 350 } 351 352 out: 353 return larval; 354 355 err: 356 larval = ERR_PTR(ret); 357 goto out; 358 } 359 360 void crypto_alg_tested(const char *name, int err) 361 { 362 struct crypto_larval *test; 363 struct crypto_alg *alg; 364 struct crypto_alg *q; 365 LIST_HEAD(list); 366 bool best; 367 368 down_write(&crypto_alg_sem); 369 list_for_each_entry(q, &crypto_alg_list, cra_list) { 370 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 371 continue; 372 373 test = (struct crypto_larval *)q; 374 375 if (!strcmp(q->cra_driver_name, name)) 376 goto found; 377 } 378 379 pr_err("alg: Unexpected test result for %s: %d\n", name, err); 380 goto unlock; 381 382 found: 383 q->cra_flags |= CRYPTO_ALG_DEAD; 384 alg = test->adult; 385 386 if (list_empty(&alg->cra_list)) 387 goto complete; 388 389 if (err == -ECANCELED) 390 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL; 391 else if (err) 392 goto complete; 393 else 394 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL; 395 396 alg->cra_flags |= CRYPTO_ALG_TESTED; 397 398 /* 399 * If a higher-priority implementation of the same algorithm is 400 * currently being tested, then don't fulfill request larvals. 401 */ 402 best = true; 403 list_for_each_entry(q, &crypto_alg_list, cra_list) { 404 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 405 continue; 406 407 if (strcmp(alg->cra_name, q->cra_name)) 408 continue; 409 410 if (q->cra_priority > alg->cra_priority) { 411 best = false; 412 break; 413 } 414 } 415 416 crypto_alg_finish_registration(alg, best, &list); 417 418 complete: 419 complete_all(&test->completion); 420 421 unlock: 422 up_write(&crypto_alg_sem); 423 424 crypto_remove_final(&list); 425 } 426 EXPORT_SYMBOL_GPL(crypto_alg_tested); 427 428 void crypto_remove_final(struct list_head *list) 429 { 430 struct crypto_alg *alg; 431 struct crypto_alg *n; 432 433 list_for_each_entry_safe(alg, n, list, cra_list) { 434 list_del_init(&alg->cra_list); 435 crypto_alg_put(alg); 436 } 437 } 438 EXPORT_SYMBOL_GPL(crypto_remove_final); 439 440 int crypto_register_alg(struct crypto_alg *alg) 441 { 442 struct crypto_larval *larval; 443 LIST_HEAD(algs_to_put); 444 bool test_started = false; 445 int err; 446 447 alg->cra_flags &= ~CRYPTO_ALG_DEAD; 448 err = crypto_check_alg(alg); 449 if (err) 450 return err; 451 452 down_write(&crypto_alg_sem); 453 larval = __crypto_register_alg(alg, &algs_to_put); 454 if (!IS_ERR_OR_NULL(larval)) { 455 test_started = crypto_boot_test_finished(); 456 larval->test_started = test_started; 457 } 458 up_write(&crypto_alg_sem); 459 460 if (IS_ERR(larval)) 461 return PTR_ERR(larval); 462 if (test_started) 463 crypto_wait_for_test(larval); 464 crypto_remove_final(&algs_to_put); 465 return 0; 466 } 467 EXPORT_SYMBOL_GPL(crypto_register_alg); 468 469 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) 470 { 471 if (unlikely(list_empty(&alg->cra_list))) 472 return -ENOENT; 473 474 alg->cra_flags |= CRYPTO_ALG_DEAD; 475 476 list_del_init(&alg->cra_list); 477 crypto_remove_spawns(alg, list, NULL); 478 479 return 0; 480 } 481 482 void crypto_unregister_alg(struct crypto_alg *alg) 483 { 484 int ret; 485 LIST_HEAD(list); 486 487 down_write(&crypto_alg_sem); 488 ret = crypto_remove_alg(alg, &list); 489 up_write(&crypto_alg_sem); 490 491 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name)) 492 return; 493 494 BUG_ON(refcount_read(&alg->cra_refcnt) != 1); 495 if (alg->cra_destroy) 496 alg->cra_destroy(alg); 497 498 crypto_remove_final(&list); 499 } 500 EXPORT_SYMBOL_GPL(crypto_unregister_alg); 501 502 int crypto_register_algs(struct crypto_alg *algs, int count) 503 { 504 int i, ret; 505 506 for (i = 0; i < count; i++) { 507 ret = crypto_register_alg(&algs[i]); 508 if (ret) 509 goto err; 510 } 511 512 return 0; 513 514 err: 515 for (--i; i >= 0; --i) 516 crypto_unregister_alg(&algs[i]); 517 518 return ret; 519 } 520 EXPORT_SYMBOL_GPL(crypto_register_algs); 521 522 void crypto_unregister_algs(struct crypto_alg *algs, int count) 523 { 524 int i; 525 526 for (i = 0; i < count; i++) 527 crypto_unregister_alg(&algs[i]); 528 } 529 EXPORT_SYMBOL_GPL(crypto_unregister_algs); 530 531 int crypto_register_template(struct crypto_template *tmpl) 532 { 533 struct crypto_template *q; 534 int err = -EEXIST; 535 536 down_write(&crypto_alg_sem); 537 538 crypto_check_module_sig(tmpl->module); 539 540 list_for_each_entry(q, &crypto_template_list, list) { 541 if (q == tmpl) 542 goto out; 543 } 544 545 list_add(&tmpl->list, &crypto_template_list); 546 err = 0; 547 out: 548 up_write(&crypto_alg_sem); 549 return err; 550 } 551 EXPORT_SYMBOL_GPL(crypto_register_template); 552 553 int crypto_register_templates(struct crypto_template *tmpls, int count) 554 { 555 int i, err; 556 557 for (i = 0; i < count; i++) { 558 err = crypto_register_template(&tmpls[i]); 559 if (err) 560 goto out; 561 } 562 return 0; 563 564 out: 565 for (--i; i >= 0; --i) 566 crypto_unregister_template(&tmpls[i]); 567 return err; 568 } 569 EXPORT_SYMBOL_GPL(crypto_register_templates); 570 571 void crypto_unregister_template(struct crypto_template *tmpl) 572 { 573 struct crypto_instance *inst; 574 struct hlist_node *n; 575 struct hlist_head *list; 576 LIST_HEAD(users); 577 578 down_write(&crypto_alg_sem); 579 580 BUG_ON(list_empty(&tmpl->list)); 581 list_del_init(&tmpl->list); 582 583 list = &tmpl->instances; 584 hlist_for_each_entry(inst, list, list) { 585 int err = crypto_remove_alg(&inst->alg, &users); 586 587 BUG_ON(err); 588 } 589 590 up_write(&crypto_alg_sem); 591 592 hlist_for_each_entry_safe(inst, n, list, list) { 593 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1); 594 crypto_free_instance(inst); 595 } 596 crypto_remove_final(&users); 597 } 598 EXPORT_SYMBOL_GPL(crypto_unregister_template); 599 600 void crypto_unregister_templates(struct crypto_template *tmpls, int count) 601 { 602 int i; 603 604 for (i = count - 1; i >= 0; --i) 605 crypto_unregister_template(&tmpls[i]); 606 } 607 EXPORT_SYMBOL_GPL(crypto_unregister_templates); 608 609 static struct crypto_template *__crypto_lookup_template(const char *name) 610 { 611 struct crypto_template *q, *tmpl = NULL; 612 613 down_read(&crypto_alg_sem); 614 list_for_each_entry(q, &crypto_template_list, list) { 615 if (strcmp(q->name, name)) 616 continue; 617 if (unlikely(!crypto_tmpl_get(q))) 618 continue; 619 620 tmpl = q; 621 break; 622 } 623 up_read(&crypto_alg_sem); 624 625 return tmpl; 626 } 627 628 struct crypto_template *crypto_lookup_template(const char *name) 629 { 630 return try_then_request_module(__crypto_lookup_template(name), 631 "crypto-%s", name); 632 } 633 EXPORT_SYMBOL_GPL(crypto_lookup_template); 634 635 int crypto_register_instance(struct crypto_template *tmpl, 636 struct crypto_instance *inst) 637 { 638 struct crypto_larval *larval; 639 struct crypto_spawn *spawn; 640 u32 fips_internal = 0; 641 LIST_HEAD(algs_to_put); 642 int err; 643 644 err = crypto_check_alg(&inst->alg); 645 if (err) 646 return err; 647 648 inst->alg.cra_module = tmpl->module; 649 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; 650 651 down_write(&crypto_alg_sem); 652 653 larval = ERR_PTR(-EAGAIN); 654 for (spawn = inst->spawns; spawn;) { 655 struct crypto_spawn *next; 656 657 if (spawn->dead) 658 goto unlock; 659 660 next = spawn->next; 661 spawn->inst = inst; 662 spawn->registered = true; 663 664 fips_internal |= spawn->alg->cra_flags; 665 666 crypto_mod_put(spawn->alg); 667 668 spawn = next; 669 } 670 671 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL); 672 673 larval = __crypto_register_alg(&inst->alg, &algs_to_put); 674 if (IS_ERR(larval)) 675 goto unlock; 676 else if (larval) 677 larval->test_started = true; 678 679 hlist_add_head(&inst->list, &tmpl->instances); 680 inst->tmpl = tmpl; 681 682 unlock: 683 up_write(&crypto_alg_sem); 684 685 if (IS_ERR(larval)) 686 return PTR_ERR(larval); 687 if (larval) 688 crypto_wait_for_test(larval); 689 crypto_remove_final(&algs_to_put); 690 return 0; 691 } 692 EXPORT_SYMBOL_GPL(crypto_register_instance); 693 694 void crypto_unregister_instance(struct crypto_instance *inst) 695 { 696 LIST_HEAD(list); 697 698 down_write(&crypto_alg_sem); 699 700 crypto_remove_spawns(&inst->alg, &list, NULL); 701 crypto_remove_instance(inst, &list); 702 703 up_write(&crypto_alg_sem); 704 705 crypto_remove_final(&list); 706 } 707 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 708 709 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst, 710 const char *name, u32 type, u32 mask) 711 { 712 struct crypto_alg *alg; 713 int err = -EAGAIN; 714 715 if (WARN_ON_ONCE(inst == NULL)) 716 return -EINVAL; 717 718 /* Allow the result of crypto_attr_alg_name() to be passed directly */ 719 if (IS_ERR(name)) 720 return PTR_ERR(name); 721 722 alg = crypto_find_alg(name, spawn->frontend, 723 type | CRYPTO_ALG_FIPS_INTERNAL, mask); 724 if (IS_ERR(alg)) 725 return PTR_ERR(alg); 726 727 down_write(&crypto_alg_sem); 728 if (!crypto_is_moribund(alg)) { 729 list_add(&spawn->list, &alg->cra_users); 730 spawn->alg = alg; 731 spawn->mask = mask; 732 spawn->next = inst->spawns; 733 inst->spawns = spawn; 734 inst->alg.cra_flags |= 735 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS); 736 err = 0; 737 } 738 up_write(&crypto_alg_sem); 739 if (err) 740 crypto_mod_put(alg); 741 return err; 742 } 743 EXPORT_SYMBOL_GPL(crypto_grab_spawn); 744 745 void crypto_drop_spawn(struct crypto_spawn *spawn) 746 { 747 if (!spawn->alg) /* not yet initialized? */ 748 return; 749 750 down_write(&crypto_alg_sem); 751 if (!spawn->dead) 752 list_del(&spawn->list); 753 up_write(&crypto_alg_sem); 754 755 if (!spawn->registered) 756 crypto_mod_put(spawn->alg); 757 } 758 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 759 760 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 761 { 762 struct crypto_alg *alg = ERR_PTR(-EAGAIN); 763 struct crypto_alg *target; 764 bool shoot = false; 765 766 down_read(&crypto_alg_sem); 767 if (!spawn->dead) { 768 alg = spawn->alg; 769 if (!crypto_mod_get(alg)) { 770 target = crypto_alg_get(alg); 771 shoot = true; 772 alg = ERR_PTR(-EAGAIN); 773 } 774 } 775 up_read(&crypto_alg_sem); 776 777 if (shoot) { 778 crypto_shoot_alg(target); 779 crypto_alg_put(target); 780 } 781 782 return alg; 783 } 784 785 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 786 u32 mask) 787 { 788 struct crypto_alg *alg; 789 struct crypto_tfm *tfm; 790 791 alg = crypto_spawn_alg(spawn); 792 if (IS_ERR(alg)) 793 return ERR_CAST(alg); 794 795 tfm = ERR_PTR(-EINVAL); 796 if (unlikely((alg->cra_flags ^ type) & mask)) 797 goto out_put_alg; 798 799 tfm = __crypto_alloc_tfm(alg, type, mask); 800 if (IS_ERR(tfm)) 801 goto out_put_alg; 802 803 return tfm; 804 805 out_put_alg: 806 crypto_mod_put(alg); 807 return tfm; 808 } 809 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 810 811 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 812 { 813 struct crypto_alg *alg; 814 struct crypto_tfm *tfm; 815 816 alg = crypto_spawn_alg(spawn); 817 if (IS_ERR(alg)) 818 return ERR_CAST(alg); 819 820 tfm = crypto_create_tfm(alg, spawn->frontend); 821 if (IS_ERR(tfm)) 822 goto out_put_alg; 823 824 return tfm; 825 826 out_put_alg: 827 crypto_mod_put(alg); 828 return tfm; 829 } 830 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 831 832 int crypto_register_notifier(struct notifier_block *nb) 833 { 834 return blocking_notifier_chain_register(&crypto_chain, nb); 835 } 836 EXPORT_SYMBOL_GPL(crypto_register_notifier); 837 838 int crypto_unregister_notifier(struct notifier_block *nb) 839 { 840 return blocking_notifier_chain_unregister(&crypto_chain, nb); 841 } 842 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 843 844 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 845 { 846 struct rtattr *rta = tb[0]; 847 struct crypto_attr_type *algt; 848 849 if (!rta) 850 return ERR_PTR(-ENOENT); 851 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 852 return ERR_PTR(-EINVAL); 853 if (rta->rta_type != CRYPTOA_TYPE) 854 return ERR_PTR(-EINVAL); 855 856 algt = RTA_DATA(rta); 857 858 return algt; 859 } 860 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 861 862 /** 863 * crypto_check_attr_type() - check algorithm type and compute inherited mask 864 * @tb: the template parameters 865 * @type: the algorithm type the template would be instantiated as 866 * @mask_ret: (output) the mask that should be passed to crypto_grab_*() 867 * to restrict the flags of any inner algorithms 868 * 869 * Validate that the algorithm type the user requested is compatible with the 870 * one the template would actually be instantiated as. E.g., if the user is 871 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because 872 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm. 873 * 874 * Also compute the mask to use to restrict the flags of any inner algorithms. 875 * 876 * Return: 0 on success; -errno on failure 877 */ 878 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret) 879 { 880 struct crypto_attr_type *algt; 881 882 algt = crypto_get_attr_type(tb); 883 if (IS_ERR(algt)) 884 return PTR_ERR(algt); 885 886 if ((algt->type ^ type) & algt->mask) 887 return -EINVAL; 888 889 *mask_ret = crypto_algt_inherited_mask(algt); 890 return 0; 891 } 892 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 893 894 const char *crypto_attr_alg_name(struct rtattr *rta) 895 { 896 struct crypto_attr_alg *alga; 897 898 if (!rta) 899 return ERR_PTR(-ENOENT); 900 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 901 return ERR_PTR(-EINVAL); 902 if (rta->rta_type != CRYPTOA_ALG) 903 return ERR_PTR(-EINVAL); 904 905 alga = RTA_DATA(rta); 906 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 907 908 return alga->name; 909 } 910 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 911 912 int crypto_inst_setname(struct crypto_instance *inst, const char *name, 913 struct crypto_alg *alg) 914 { 915 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 916 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 917 return -ENAMETOOLONG; 918 919 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", 920 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 921 return -ENAMETOOLONG; 922 923 return 0; 924 } 925 EXPORT_SYMBOL_GPL(crypto_inst_setname); 926 927 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 928 { 929 INIT_LIST_HEAD(&queue->list); 930 queue->backlog = &queue->list; 931 queue->qlen = 0; 932 queue->max_qlen = max_qlen; 933 } 934 EXPORT_SYMBOL_GPL(crypto_init_queue); 935 936 int crypto_enqueue_request(struct crypto_queue *queue, 937 struct crypto_async_request *request) 938 { 939 int err = -EINPROGRESS; 940 941 if (unlikely(queue->qlen >= queue->max_qlen)) { 942 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) { 943 err = -ENOSPC; 944 goto out; 945 } 946 err = -EBUSY; 947 if (queue->backlog == &queue->list) 948 queue->backlog = &request->list; 949 } 950 951 queue->qlen++; 952 list_add_tail(&request->list, &queue->list); 953 954 out: 955 return err; 956 } 957 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 958 959 void crypto_enqueue_request_head(struct crypto_queue *queue, 960 struct crypto_async_request *request) 961 { 962 queue->qlen++; 963 list_add(&request->list, &queue->list); 964 } 965 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head); 966 967 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 968 { 969 struct list_head *request; 970 971 if (unlikely(!queue->qlen)) 972 return NULL; 973 974 queue->qlen--; 975 976 if (queue->backlog != &queue->list) 977 queue->backlog = queue->backlog->next; 978 979 request = queue->list.next; 980 list_del(request); 981 982 return list_entry(request, struct crypto_async_request, list); 983 } 984 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 985 986 static inline void crypto_inc_byte(u8 *a, unsigned int size) 987 { 988 u8 *b = (a + size); 989 u8 c; 990 991 for (; size; size--) { 992 c = *--b + 1; 993 *b = c; 994 if (c) 995 break; 996 } 997 } 998 999 void crypto_inc(u8 *a, unsigned int size) 1000 { 1001 __be32 *b = (__be32 *)(a + size); 1002 u32 c; 1003 1004 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || 1005 IS_ALIGNED((unsigned long)b, __alignof__(*b))) 1006 for (; size >= 4; size -= 4) { 1007 c = be32_to_cpu(*--b) + 1; 1008 *b = cpu_to_be32(c); 1009 if (likely(c)) 1010 return; 1011 } 1012 1013 crypto_inc_byte(a, size); 1014 } 1015 EXPORT_SYMBOL_GPL(crypto_inc); 1016 1017 unsigned int crypto_alg_extsize(struct crypto_alg *alg) 1018 { 1019 return alg->cra_ctxsize + 1020 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); 1021 } 1022 EXPORT_SYMBOL_GPL(crypto_alg_extsize); 1023 1024 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend, 1025 u32 type, u32 mask) 1026 { 1027 int ret = 0; 1028 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask); 1029 1030 if (!IS_ERR(alg)) { 1031 crypto_mod_put(alg); 1032 ret = 1; 1033 } 1034 1035 return ret; 1036 } 1037 EXPORT_SYMBOL_GPL(crypto_type_has_alg); 1038 1039 static void __init crypto_start_tests(void) 1040 { 1041 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS)) 1042 return; 1043 1044 for (;;) { 1045 struct crypto_larval *larval = NULL; 1046 struct crypto_alg *q; 1047 1048 down_write(&crypto_alg_sem); 1049 1050 list_for_each_entry(q, &crypto_alg_list, cra_list) { 1051 struct crypto_larval *l; 1052 1053 if (!crypto_is_larval(q)) 1054 continue; 1055 1056 l = (void *)q; 1057 1058 if (!crypto_is_test_larval(l)) 1059 continue; 1060 1061 if (l->test_started) 1062 continue; 1063 1064 l->test_started = true; 1065 larval = l; 1066 break; 1067 } 1068 1069 up_write(&crypto_alg_sem); 1070 1071 if (!larval) 1072 break; 1073 1074 crypto_wait_for_test(larval); 1075 } 1076 1077 set_crypto_boot_test_finished(); 1078 } 1079 1080 static int __init crypto_algapi_init(void) 1081 { 1082 crypto_init_proc(); 1083 crypto_start_tests(); 1084 return 0; 1085 } 1086 1087 static void __exit crypto_algapi_exit(void) 1088 { 1089 crypto_exit_proc(); 1090 } 1091 1092 /* 1093 * We run this at late_initcall so that all the built-in algorithms 1094 * have had a chance to register themselves first. 1095 */ 1096 late_initcall(crypto_algapi_init); 1097 module_exit(crypto_algapi_exit); 1098 1099 MODULE_LICENSE("GPL"); 1100 MODULE_DESCRIPTION("Cryptographic algorithms API"); 1101 MODULE_SOFTDEP("pre: cryptomgr"); 1102