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