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 if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1)) 495 return; 496 497 if (alg->cra_destroy) 498 alg->cra_destroy(alg); 499 500 crypto_remove_final(&list); 501 } 502 EXPORT_SYMBOL_GPL(crypto_unregister_alg); 503 504 int crypto_register_algs(struct crypto_alg *algs, int count) 505 { 506 int i, ret; 507 508 for (i = 0; i < count; i++) { 509 ret = crypto_register_alg(&algs[i]); 510 if (ret) 511 goto err; 512 } 513 514 return 0; 515 516 err: 517 for (--i; i >= 0; --i) 518 crypto_unregister_alg(&algs[i]); 519 520 return ret; 521 } 522 EXPORT_SYMBOL_GPL(crypto_register_algs); 523 524 void crypto_unregister_algs(struct crypto_alg *algs, int count) 525 { 526 int i; 527 528 for (i = 0; i < count; i++) 529 crypto_unregister_alg(&algs[i]); 530 } 531 EXPORT_SYMBOL_GPL(crypto_unregister_algs); 532 533 int crypto_register_template(struct crypto_template *tmpl) 534 { 535 struct crypto_template *q; 536 int err = -EEXIST; 537 538 down_write(&crypto_alg_sem); 539 540 crypto_check_module_sig(tmpl->module); 541 542 list_for_each_entry(q, &crypto_template_list, list) { 543 if (q == tmpl) 544 goto out; 545 } 546 547 list_add(&tmpl->list, &crypto_template_list); 548 err = 0; 549 out: 550 up_write(&crypto_alg_sem); 551 return err; 552 } 553 EXPORT_SYMBOL_GPL(crypto_register_template); 554 555 int crypto_register_templates(struct crypto_template *tmpls, int count) 556 { 557 int i, err; 558 559 for (i = 0; i < count; i++) { 560 err = crypto_register_template(&tmpls[i]); 561 if (err) 562 goto out; 563 } 564 return 0; 565 566 out: 567 for (--i; i >= 0; --i) 568 crypto_unregister_template(&tmpls[i]); 569 return err; 570 } 571 EXPORT_SYMBOL_GPL(crypto_register_templates); 572 573 void crypto_unregister_template(struct crypto_template *tmpl) 574 { 575 struct crypto_instance *inst; 576 struct hlist_node *n; 577 struct hlist_head *list; 578 LIST_HEAD(users); 579 580 down_write(&crypto_alg_sem); 581 582 BUG_ON(list_empty(&tmpl->list)); 583 list_del_init(&tmpl->list); 584 585 list = &tmpl->instances; 586 hlist_for_each_entry(inst, list, list) { 587 int err = crypto_remove_alg(&inst->alg, &users); 588 589 BUG_ON(err); 590 } 591 592 up_write(&crypto_alg_sem); 593 594 hlist_for_each_entry_safe(inst, n, list, list) { 595 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1); 596 crypto_free_instance(inst); 597 } 598 crypto_remove_final(&users); 599 } 600 EXPORT_SYMBOL_GPL(crypto_unregister_template); 601 602 void crypto_unregister_templates(struct crypto_template *tmpls, int count) 603 { 604 int i; 605 606 for (i = count - 1; i >= 0; --i) 607 crypto_unregister_template(&tmpls[i]); 608 } 609 EXPORT_SYMBOL_GPL(crypto_unregister_templates); 610 611 static struct crypto_template *__crypto_lookup_template(const char *name) 612 { 613 struct crypto_template *q, *tmpl = NULL; 614 615 down_read(&crypto_alg_sem); 616 list_for_each_entry(q, &crypto_template_list, list) { 617 if (strcmp(q->name, name)) 618 continue; 619 if (unlikely(!crypto_tmpl_get(q))) 620 continue; 621 622 tmpl = q; 623 break; 624 } 625 up_read(&crypto_alg_sem); 626 627 return tmpl; 628 } 629 630 struct crypto_template *crypto_lookup_template(const char *name) 631 { 632 return try_then_request_module(__crypto_lookup_template(name), 633 "crypto-%s", name); 634 } 635 EXPORT_SYMBOL_GPL(crypto_lookup_template); 636 637 int crypto_register_instance(struct crypto_template *tmpl, 638 struct crypto_instance *inst) 639 { 640 struct crypto_larval *larval; 641 struct crypto_spawn *spawn; 642 u32 fips_internal = 0; 643 LIST_HEAD(algs_to_put); 644 int err; 645 646 err = crypto_check_alg(&inst->alg); 647 if (err) 648 return err; 649 650 inst->alg.cra_module = tmpl->module; 651 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; 652 653 down_write(&crypto_alg_sem); 654 655 larval = ERR_PTR(-EAGAIN); 656 for (spawn = inst->spawns; spawn;) { 657 struct crypto_spawn *next; 658 659 if (spawn->dead) 660 goto unlock; 661 662 next = spawn->next; 663 spawn->inst = inst; 664 spawn->registered = true; 665 666 fips_internal |= spawn->alg->cra_flags; 667 668 crypto_mod_put(spawn->alg); 669 670 spawn = next; 671 } 672 673 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL); 674 675 larval = __crypto_register_alg(&inst->alg, &algs_to_put); 676 if (IS_ERR(larval)) 677 goto unlock; 678 else if (larval) 679 larval->test_started = true; 680 681 hlist_add_head(&inst->list, &tmpl->instances); 682 inst->tmpl = tmpl; 683 684 unlock: 685 up_write(&crypto_alg_sem); 686 687 if (IS_ERR(larval)) 688 return PTR_ERR(larval); 689 if (larval) 690 crypto_wait_for_test(larval); 691 crypto_remove_final(&algs_to_put); 692 return 0; 693 } 694 EXPORT_SYMBOL_GPL(crypto_register_instance); 695 696 void crypto_unregister_instance(struct crypto_instance *inst) 697 { 698 LIST_HEAD(list); 699 700 down_write(&crypto_alg_sem); 701 702 crypto_remove_spawns(&inst->alg, &list, NULL); 703 crypto_remove_instance(inst, &list); 704 705 up_write(&crypto_alg_sem); 706 707 crypto_remove_final(&list); 708 } 709 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 710 711 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst, 712 const char *name, u32 type, u32 mask) 713 { 714 struct crypto_alg *alg; 715 int err = -EAGAIN; 716 717 if (WARN_ON_ONCE(inst == NULL)) 718 return -EINVAL; 719 720 /* Allow the result of crypto_attr_alg_name() to be passed directly */ 721 if (IS_ERR(name)) 722 return PTR_ERR(name); 723 724 alg = crypto_find_alg(name, spawn->frontend, 725 type | CRYPTO_ALG_FIPS_INTERNAL, mask); 726 if (IS_ERR(alg)) 727 return PTR_ERR(alg); 728 729 down_write(&crypto_alg_sem); 730 if (!crypto_is_moribund(alg)) { 731 list_add(&spawn->list, &alg->cra_users); 732 spawn->alg = alg; 733 spawn->mask = mask; 734 spawn->next = inst->spawns; 735 inst->spawns = spawn; 736 inst->alg.cra_flags |= 737 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS); 738 err = 0; 739 } 740 up_write(&crypto_alg_sem); 741 if (err) 742 crypto_mod_put(alg); 743 return err; 744 } 745 EXPORT_SYMBOL_GPL(crypto_grab_spawn); 746 747 void crypto_drop_spawn(struct crypto_spawn *spawn) 748 { 749 if (!spawn->alg) /* not yet initialized? */ 750 return; 751 752 down_write(&crypto_alg_sem); 753 if (!spawn->dead) 754 list_del(&spawn->list); 755 up_write(&crypto_alg_sem); 756 757 if (!spawn->registered) 758 crypto_mod_put(spawn->alg); 759 } 760 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 761 762 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 763 { 764 struct crypto_alg *alg = ERR_PTR(-EAGAIN); 765 struct crypto_alg *target; 766 bool shoot = false; 767 768 down_read(&crypto_alg_sem); 769 if (!spawn->dead) { 770 alg = spawn->alg; 771 if (!crypto_mod_get(alg)) { 772 target = crypto_alg_get(alg); 773 shoot = true; 774 alg = ERR_PTR(-EAGAIN); 775 } 776 } 777 up_read(&crypto_alg_sem); 778 779 if (shoot) { 780 crypto_shoot_alg(target); 781 crypto_alg_put(target); 782 } 783 784 return alg; 785 } 786 787 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 788 u32 mask) 789 { 790 struct crypto_alg *alg; 791 struct crypto_tfm *tfm; 792 793 alg = crypto_spawn_alg(spawn); 794 if (IS_ERR(alg)) 795 return ERR_CAST(alg); 796 797 tfm = ERR_PTR(-EINVAL); 798 if (unlikely((alg->cra_flags ^ type) & mask)) 799 goto out_put_alg; 800 801 tfm = __crypto_alloc_tfm(alg, type, mask); 802 if (IS_ERR(tfm)) 803 goto out_put_alg; 804 805 return tfm; 806 807 out_put_alg: 808 crypto_mod_put(alg); 809 return tfm; 810 } 811 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 812 813 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 814 { 815 struct crypto_alg *alg; 816 struct crypto_tfm *tfm; 817 818 alg = crypto_spawn_alg(spawn); 819 if (IS_ERR(alg)) 820 return ERR_CAST(alg); 821 822 tfm = crypto_create_tfm(alg, spawn->frontend); 823 if (IS_ERR(tfm)) 824 goto out_put_alg; 825 826 return tfm; 827 828 out_put_alg: 829 crypto_mod_put(alg); 830 return tfm; 831 } 832 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 833 834 int crypto_register_notifier(struct notifier_block *nb) 835 { 836 return blocking_notifier_chain_register(&crypto_chain, nb); 837 } 838 EXPORT_SYMBOL_GPL(crypto_register_notifier); 839 840 int crypto_unregister_notifier(struct notifier_block *nb) 841 { 842 return blocking_notifier_chain_unregister(&crypto_chain, nb); 843 } 844 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 845 846 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 847 { 848 struct rtattr *rta = tb[0]; 849 struct crypto_attr_type *algt; 850 851 if (!rta) 852 return ERR_PTR(-ENOENT); 853 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 854 return ERR_PTR(-EINVAL); 855 if (rta->rta_type != CRYPTOA_TYPE) 856 return ERR_PTR(-EINVAL); 857 858 algt = RTA_DATA(rta); 859 860 return algt; 861 } 862 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 863 864 /** 865 * crypto_check_attr_type() - check algorithm type and compute inherited mask 866 * @tb: the template parameters 867 * @type: the algorithm type the template would be instantiated as 868 * @mask_ret: (output) the mask that should be passed to crypto_grab_*() 869 * to restrict the flags of any inner algorithms 870 * 871 * Validate that the algorithm type the user requested is compatible with the 872 * one the template would actually be instantiated as. E.g., if the user is 873 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because 874 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm. 875 * 876 * Also compute the mask to use to restrict the flags of any inner algorithms. 877 * 878 * Return: 0 on success; -errno on failure 879 */ 880 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret) 881 { 882 struct crypto_attr_type *algt; 883 884 algt = crypto_get_attr_type(tb); 885 if (IS_ERR(algt)) 886 return PTR_ERR(algt); 887 888 if ((algt->type ^ type) & algt->mask) 889 return -EINVAL; 890 891 *mask_ret = crypto_algt_inherited_mask(algt); 892 return 0; 893 } 894 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 895 896 const char *crypto_attr_alg_name(struct rtattr *rta) 897 { 898 struct crypto_attr_alg *alga; 899 900 if (!rta) 901 return ERR_PTR(-ENOENT); 902 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 903 return ERR_PTR(-EINVAL); 904 if (rta->rta_type != CRYPTOA_ALG) 905 return ERR_PTR(-EINVAL); 906 907 alga = RTA_DATA(rta); 908 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 909 910 return alga->name; 911 } 912 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 913 914 int crypto_inst_setname(struct crypto_instance *inst, const char *name, 915 struct crypto_alg *alg) 916 { 917 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 918 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 919 return -ENAMETOOLONG; 920 921 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", 922 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 923 return -ENAMETOOLONG; 924 925 return 0; 926 } 927 EXPORT_SYMBOL_GPL(crypto_inst_setname); 928 929 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 930 { 931 INIT_LIST_HEAD(&queue->list); 932 queue->backlog = &queue->list; 933 queue->qlen = 0; 934 queue->max_qlen = max_qlen; 935 } 936 EXPORT_SYMBOL_GPL(crypto_init_queue); 937 938 int crypto_enqueue_request(struct crypto_queue *queue, 939 struct crypto_async_request *request) 940 { 941 int err = -EINPROGRESS; 942 943 if (unlikely(queue->qlen >= queue->max_qlen)) { 944 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) { 945 err = -ENOSPC; 946 goto out; 947 } 948 err = -EBUSY; 949 if (queue->backlog == &queue->list) 950 queue->backlog = &request->list; 951 } 952 953 queue->qlen++; 954 list_add_tail(&request->list, &queue->list); 955 956 out: 957 return err; 958 } 959 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 960 961 void crypto_enqueue_request_head(struct crypto_queue *queue, 962 struct crypto_async_request *request) 963 { 964 if (unlikely(queue->qlen >= queue->max_qlen)) 965 queue->backlog = queue->backlog->prev; 966 967 queue->qlen++; 968 list_add(&request->list, &queue->list); 969 } 970 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head); 971 972 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 973 { 974 struct list_head *request; 975 976 if (unlikely(!queue->qlen)) 977 return NULL; 978 979 queue->qlen--; 980 981 if (queue->backlog != &queue->list) 982 queue->backlog = queue->backlog->next; 983 984 request = queue->list.next; 985 list_del(request); 986 987 return list_entry(request, struct crypto_async_request, list); 988 } 989 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 990 991 static inline void crypto_inc_byte(u8 *a, unsigned int size) 992 { 993 u8 *b = (a + size); 994 u8 c; 995 996 for (; size; size--) { 997 c = *--b + 1; 998 *b = c; 999 if (c) 1000 break; 1001 } 1002 } 1003 1004 void crypto_inc(u8 *a, unsigned int size) 1005 { 1006 __be32 *b = (__be32 *)(a + size); 1007 u32 c; 1008 1009 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || 1010 IS_ALIGNED((unsigned long)b, __alignof__(*b))) 1011 for (; size >= 4; size -= 4) { 1012 c = be32_to_cpu(*--b) + 1; 1013 *b = cpu_to_be32(c); 1014 if (likely(c)) 1015 return; 1016 } 1017 1018 crypto_inc_byte(a, size); 1019 } 1020 EXPORT_SYMBOL_GPL(crypto_inc); 1021 1022 unsigned int crypto_alg_extsize(struct crypto_alg *alg) 1023 { 1024 return alg->cra_ctxsize + 1025 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); 1026 } 1027 EXPORT_SYMBOL_GPL(crypto_alg_extsize); 1028 1029 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend, 1030 u32 type, u32 mask) 1031 { 1032 int ret = 0; 1033 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask); 1034 1035 if (!IS_ERR(alg)) { 1036 crypto_mod_put(alg); 1037 ret = 1; 1038 } 1039 1040 return ret; 1041 } 1042 EXPORT_SYMBOL_GPL(crypto_type_has_alg); 1043 1044 static void __init crypto_start_tests(void) 1045 { 1046 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS)) 1047 return; 1048 1049 for (;;) { 1050 struct crypto_larval *larval = NULL; 1051 struct crypto_alg *q; 1052 1053 down_write(&crypto_alg_sem); 1054 1055 list_for_each_entry(q, &crypto_alg_list, cra_list) { 1056 struct crypto_larval *l; 1057 1058 if (!crypto_is_larval(q)) 1059 continue; 1060 1061 l = (void *)q; 1062 1063 if (!crypto_is_test_larval(l)) 1064 continue; 1065 1066 if (l->test_started) 1067 continue; 1068 1069 l->test_started = true; 1070 larval = l; 1071 break; 1072 } 1073 1074 up_write(&crypto_alg_sem); 1075 1076 if (!larval) 1077 break; 1078 1079 crypto_wait_for_test(larval); 1080 } 1081 1082 set_crypto_boot_test_finished(); 1083 } 1084 1085 static int __init crypto_algapi_init(void) 1086 { 1087 crypto_init_proc(); 1088 crypto_start_tests(); 1089 return 0; 1090 } 1091 1092 static void __exit crypto_algapi_exit(void) 1093 { 1094 crypto_exit_proc(); 1095 } 1096 1097 /* 1098 * We run this at late_initcall so that all the built-in algorithms 1099 * have had a chance to register themselves first. 1100 */ 1101 late_initcall(crypto_algapi_init); 1102 module_exit(crypto_algapi_exit); 1103 1104 MODULE_LICENSE("GPL"); 1105 MODULE_DESCRIPTION("Cryptographic algorithms API"); 1106 MODULE_SOFTDEP("pre: cryptomgr"); 1107