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_driver_name, alg->cra_driver_name) || 345 !strcmp(q->cra_name, alg->cra_driver_name)) 346 goto err; 347 } 348 349 larval = crypto_alloc_test_larval(alg); 350 if (IS_ERR(larval)) 351 goto out; 352 353 list_add(&alg->cra_list, &crypto_alg_list); 354 355 if (larval) { 356 /* No cheating! */ 357 alg->cra_flags &= ~CRYPTO_ALG_TESTED; 358 359 list_add(&larval->alg.cra_list, &crypto_alg_list); 360 } else { 361 alg->cra_flags |= CRYPTO_ALG_TESTED; 362 crypto_alg_finish_registration(alg, true, algs_to_put); 363 } 364 365 out: 366 return larval; 367 368 err: 369 larval = ERR_PTR(ret); 370 goto out; 371 } 372 373 void crypto_alg_tested(const char *name, int err) 374 { 375 struct crypto_larval *test; 376 struct crypto_alg *alg; 377 struct crypto_alg *q; 378 LIST_HEAD(list); 379 bool best; 380 381 down_write(&crypto_alg_sem); 382 list_for_each_entry(q, &crypto_alg_list, cra_list) { 383 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 384 continue; 385 386 test = (struct crypto_larval *)q; 387 388 if (!strcmp(q->cra_driver_name, name)) 389 goto found; 390 } 391 392 pr_err("alg: Unexpected test result for %s: %d\n", name, err); 393 goto unlock; 394 395 found: 396 q->cra_flags |= CRYPTO_ALG_DEAD; 397 alg = test->adult; 398 399 if (list_empty(&alg->cra_list)) 400 goto complete; 401 402 if (err == -ECANCELED) 403 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL; 404 else if (err) 405 goto complete; 406 else 407 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL; 408 409 alg->cra_flags |= CRYPTO_ALG_TESTED; 410 411 /* 412 * If a higher-priority implementation of the same algorithm is 413 * currently being tested, then don't fulfill request larvals. 414 */ 415 best = true; 416 list_for_each_entry(q, &crypto_alg_list, cra_list) { 417 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 418 continue; 419 420 if (strcmp(alg->cra_name, q->cra_name)) 421 continue; 422 423 if (q->cra_priority > alg->cra_priority) { 424 best = false; 425 break; 426 } 427 } 428 429 crypto_alg_finish_registration(alg, best, &list); 430 431 complete: 432 complete_all(&test->completion); 433 434 unlock: 435 up_write(&crypto_alg_sem); 436 437 crypto_remove_final(&list); 438 } 439 EXPORT_SYMBOL_GPL(crypto_alg_tested); 440 441 void crypto_remove_final(struct list_head *list) 442 { 443 struct crypto_alg *alg; 444 struct crypto_alg *n; 445 446 list_for_each_entry_safe(alg, n, list, cra_list) { 447 list_del_init(&alg->cra_list); 448 crypto_alg_put(alg); 449 } 450 } 451 EXPORT_SYMBOL_GPL(crypto_remove_final); 452 453 int crypto_register_alg(struct crypto_alg *alg) 454 { 455 struct crypto_larval *larval; 456 LIST_HEAD(algs_to_put); 457 bool test_started = false; 458 int err; 459 460 alg->cra_flags &= ~CRYPTO_ALG_DEAD; 461 err = crypto_check_alg(alg); 462 if (err) 463 return err; 464 465 down_write(&crypto_alg_sem); 466 larval = __crypto_register_alg(alg, &algs_to_put); 467 if (!IS_ERR_OR_NULL(larval)) { 468 test_started = crypto_boot_test_finished(); 469 larval->test_started = test_started; 470 } 471 up_write(&crypto_alg_sem); 472 473 if (IS_ERR(larval)) 474 return PTR_ERR(larval); 475 if (test_started) 476 crypto_wait_for_test(larval); 477 crypto_remove_final(&algs_to_put); 478 return 0; 479 } 480 EXPORT_SYMBOL_GPL(crypto_register_alg); 481 482 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) 483 { 484 if (unlikely(list_empty(&alg->cra_list))) 485 return -ENOENT; 486 487 alg->cra_flags |= CRYPTO_ALG_DEAD; 488 489 list_del_init(&alg->cra_list); 490 crypto_remove_spawns(alg, list, NULL); 491 492 return 0; 493 } 494 495 void crypto_unregister_alg(struct crypto_alg *alg) 496 { 497 int ret; 498 LIST_HEAD(list); 499 500 down_write(&crypto_alg_sem); 501 ret = crypto_remove_alg(alg, &list); 502 up_write(&crypto_alg_sem); 503 504 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name)) 505 return; 506 507 if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1)) 508 return; 509 510 if (alg->cra_destroy) 511 alg->cra_destroy(alg); 512 513 crypto_remove_final(&list); 514 } 515 EXPORT_SYMBOL_GPL(crypto_unregister_alg); 516 517 int crypto_register_algs(struct crypto_alg *algs, int count) 518 { 519 int i, ret; 520 521 for (i = 0; i < count; i++) { 522 ret = crypto_register_alg(&algs[i]); 523 if (ret) 524 goto err; 525 } 526 527 return 0; 528 529 err: 530 for (--i; i >= 0; --i) 531 crypto_unregister_alg(&algs[i]); 532 533 return ret; 534 } 535 EXPORT_SYMBOL_GPL(crypto_register_algs); 536 537 void crypto_unregister_algs(struct crypto_alg *algs, int count) 538 { 539 int i; 540 541 for (i = 0; i < count; i++) 542 crypto_unregister_alg(&algs[i]); 543 } 544 EXPORT_SYMBOL_GPL(crypto_unregister_algs); 545 546 int crypto_register_template(struct crypto_template *tmpl) 547 { 548 struct crypto_template *q; 549 int err = -EEXIST; 550 551 down_write(&crypto_alg_sem); 552 553 crypto_check_module_sig(tmpl->module); 554 555 list_for_each_entry(q, &crypto_template_list, list) { 556 if (q == tmpl) 557 goto out; 558 } 559 560 list_add(&tmpl->list, &crypto_template_list); 561 err = 0; 562 out: 563 up_write(&crypto_alg_sem); 564 return err; 565 } 566 EXPORT_SYMBOL_GPL(crypto_register_template); 567 568 int crypto_register_templates(struct crypto_template *tmpls, int count) 569 { 570 int i, err; 571 572 for (i = 0; i < count; i++) { 573 err = crypto_register_template(&tmpls[i]); 574 if (err) 575 goto out; 576 } 577 return 0; 578 579 out: 580 for (--i; i >= 0; --i) 581 crypto_unregister_template(&tmpls[i]); 582 return err; 583 } 584 EXPORT_SYMBOL_GPL(crypto_register_templates); 585 586 void crypto_unregister_template(struct crypto_template *tmpl) 587 { 588 struct crypto_instance *inst; 589 struct hlist_node *n; 590 struct hlist_head *list; 591 LIST_HEAD(users); 592 593 down_write(&crypto_alg_sem); 594 595 BUG_ON(list_empty(&tmpl->list)); 596 list_del_init(&tmpl->list); 597 598 list = &tmpl->instances; 599 hlist_for_each_entry(inst, list, list) { 600 int err = crypto_remove_alg(&inst->alg, &users); 601 602 BUG_ON(err); 603 } 604 605 up_write(&crypto_alg_sem); 606 607 hlist_for_each_entry_safe(inst, n, list, list) { 608 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1); 609 crypto_free_instance(inst); 610 } 611 crypto_remove_final(&users); 612 } 613 EXPORT_SYMBOL_GPL(crypto_unregister_template); 614 615 void crypto_unregister_templates(struct crypto_template *tmpls, int count) 616 { 617 int i; 618 619 for (i = count - 1; i >= 0; --i) 620 crypto_unregister_template(&tmpls[i]); 621 } 622 EXPORT_SYMBOL_GPL(crypto_unregister_templates); 623 624 static struct crypto_template *__crypto_lookup_template(const char *name) 625 { 626 struct crypto_template *q, *tmpl = NULL; 627 628 down_read(&crypto_alg_sem); 629 list_for_each_entry(q, &crypto_template_list, list) { 630 if (strcmp(q->name, name)) 631 continue; 632 if (unlikely(!crypto_tmpl_get(q))) 633 continue; 634 635 tmpl = q; 636 break; 637 } 638 up_read(&crypto_alg_sem); 639 640 return tmpl; 641 } 642 643 struct crypto_template *crypto_lookup_template(const char *name) 644 { 645 return try_then_request_module(__crypto_lookup_template(name), 646 "crypto-%s", name); 647 } 648 EXPORT_SYMBOL_GPL(crypto_lookup_template); 649 650 int crypto_register_instance(struct crypto_template *tmpl, 651 struct crypto_instance *inst) 652 { 653 struct crypto_larval *larval; 654 struct crypto_spawn *spawn; 655 u32 fips_internal = 0; 656 LIST_HEAD(algs_to_put); 657 int err; 658 659 err = crypto_check_alg(&inst->alg); 660 if (err) 661 return err; 662 663 inst->alg.cra_module = tmpl->module; 664 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; 665 666 down_write(&crypto_alg_sem); 667 668 larval = ERR_PTR(-EAGAIN); 669 for (spawn = inst->spawns; spawn;) { 670 struct crypto_spawn *next; 671 672 if (spawn->dead) 673 goto unlock; 674 675 next = spawn->next; 676 spawn->inst = inst; 677 spawn->registered = true; 678 679 fips_internal |= spawn->alg->cra_flags; 680 681 crypto_mod_put(spawn->alg); 682 683 spawn = next; 684 } 685 686 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL); 687 688 larval = __crypto_register_alg(&inst->alg, &algs_to_put); 689 if (IS_ERR(larval)) 690 goto unlock; 691 else if (larval) 692 larval->test_started = true; 693 694 hlist_add_head(&inst->list, &tmpl->instances); 695 inst->tmpl = tmpl; 696 697 unlock: 698 up_write(&crypto_alg_sem); 699 700 if (IS_ERR(larval)) 701 return PTR_ERR(larval); 702 if (larval) 703 crypto_wait_for_test(larval); 704 crypto_remove_final(&algs_to_put); 705 return 0; 706 } 707 EXPORT_SYMBOL_GPL(crypto_register_instance); 708 709 void crypto_unregister_instance(struct crypto_instance *inst) 710 { 711 LIST_HEAD(list); 712 713 down_write(&crypto_alg_sem); 714 715 crypto_remove_spawns(&inst->alg, &list, NULL); 716 crypto_remove_instance(inst, &list); 717 718 up_write(&crypto_alg_sem); 719 720 crypto_remove_final(&list); 721 } 722 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 723 724 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst, 725 const char *name, u32 type, u32 mask) 726 { 727 struct crypto_alg *alg; 728 int err = -EAGAIN; 729 730 if (WARN_ON_ONCE(inst == NULL)) 731 return -EINVAL; 732 733 /* Allow the result of crypto_attr_alg_name() to be passed directly */ 734 if (IS_ERR(name)) 735 return PTR_ERR(name); 736 737 alg = crypto_find_alg(name, spawn->frontend, 738 type | CRYPTO_ALG_FIPS_INTERNAL, mask); 739 if (IS_ERR(alg)) 740 return PTR_ERR(alg); 741 742 down_write(&crypto_alg_sem); 743 if (!crypto_is_moribund(alg)) { 744 list_add(&spawn->list, &alg->cra_users); 745 spawn->alg = alg; 746 spawn->mask = mask; 747 spawn->next = inst->spawns; 748 inst->spawns = spawn; 749 inst->alg.cra_flags |= 750 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS); 751 err = 0; 752 } 753 up_write(&crypto_alg_sem); 754 if (err) 755 crypto_mod_put(alg); 756 return err; 757 } 758 EXPORT_SYMBOL_GPL(crypto_grab_spawn); 759 760 void crypto_drop_spawn(struct crypto_spawn *spawn) 761 { 762 if (!spawn->alg) /* not yet initialized? */ 763 return; 764 765 down_write(&crypto_alg_sem); 766 if (!spawn->dead) 767 list_del(&spawn->list); 768 up_write(&crypto_alg_sem); 769 770 if (!spawn->registered) 771 crypto_mod_put(spawn->alg); 772 } 773 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 774 775 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 776 { 777 struct crypto_alg *alg = ERR_PTR(-EAGAIN); 778 struct crypto_alg *target; 779 bool shoot = false; 780 781 down_read(&crypto_alg_sem); 782 if (!spawn->dead) { 783 alg = spawn->alg; 784 if (!crypto_mod_get(alg)) { 785 target = crypto_alg_get(alg); 786 shoot = true; 787 alg = ERR_PTR(-EAGAIN); 788 } 789 } 790 up_read(&crypto_alg_sem); 791 792 if (shoot) { 793 crypto_shoot_alg(target); 794 crypto_alg_put(target); 795 } 796 797 return alg; 798 } 799 800 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 801 u32 mask) 802 { 803 struct crypto_alg *alg; 804 struct crypto_tfm *tfm; 805 806 alg = crypto_spawn_alg(spawn); 807 if (IS_ERR(alg)) 808 return ERR_CAST(alg); 809 810 tfm = ERR_PTR(-EINVAL); 811 if (unlikely((alg->cra_flags ^ type) & mask)) 812 goto out_put_alg; 813 814 tfm = __crypto_alloc_tfm(alg, type, mask); 815 if (IS_ERR(tfm)) 816 goto out_put_alg; 817 818 return tfm; 819 820 out_put_alg: 821 crypto_mod_put(alg); 822 return tfm; 823 } 824 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 825 826 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 827 { 828 struct crypto_alg *alg; 829 struct crypto_tfm *tfm; 830 831 alg = crypto_spawn_alg(spawn); 832 if (IS_ERR(alg)) 833 return ERR_CAST(alg); 834 835 tfm = crypto_create_tfm(alg, spawn->frontend); 836 if (IS_ERR(tfm)) 837 goto out_put_alg; 838 839 return tfm; 840 841 out_put_alg: 842 crypto_mod_put(alg); 843 return tfm; 844 } 845 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 846 847 int crypto_register_notifier(struct notifier_block *nb) 848 { 849 return blocking_notifier_chain_register(&crypto_chain, nb); 850 } 851 EXPORT_SYMBOL_GPL(crypto_register_notifier); 852 853 int crypto_unregister_notifier(struct notifier_block *nb) 854 { 855 return blocking_notifier_chain_unregister(&crypto_chain, nb); 856 } 857 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 858 859 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 860 { 861 struct rtattr *rta = tb[0]; 862 struct crypto_attr_type *algt; 863 864 if (!rta) 865 return ERR_PTR(-ENOENT); 866 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 867 return ERR_PTR(-EINVAL); 868 if (rta->rta_type != CRYPTOA_TYPE) 869 return ERR_PTR(-EINVAL); 870 871 algt = RTA_DATA(rta); 872 873 return algt; 874 } 875 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 876 877 /** 878 * crypto_check_attr_type() - check algorithm type and compute inherited mask 879 * @tb: the template parameters 880 * @type: the algorithm type the template would be instantiated as 881 * @mask_ret: (output) the mask that should be passed to crypto_grab_*() 882 * to restrict the flags of any inner algorithms 883 * 884 * Validate that the algorithm type the user requested is compatible with the 885 * one the template would actually be instantiated as. E.g., if the user is 886 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because 887 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm. 888 * 889 * Also compute the mask to use to restrict the flags of any inner algorithms. 890 * 891 * Return: 0 on success; -errno on failure 892 */ 893 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret) 894 { 895 struct crypto_attr_type *algt; 896 897 algt = crypto_get_attr_type(tb); 898 if (IS_ERR(algt)) 899 return PTR_ERR(algt); 900 901 if ((algt->type ^ type) & algt->mask) 902 return -EINVAL; 903 904 *mask_ret = crypto_algt_inherited_mask(algt); 905 return 0; 906 } 907 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 908 909 const char *crypto_attr_alg_name(struct rtattr *rta) 910 { 911 struct crypto_attr_alg *alga; 912 913 if (!rta) 914 return ERR_PTR(-ENOENT); 915 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 916 return ERR_PTR(-EINVAL); 917 if (rta->rta_type != CRYPTOA_ALG) 918 return ERR_PTR(-EINVAL); 919 920 alga = RTA_DATA(rta); 921 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 922 923 return alga->name; 924 } 925 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 926 927 int crypto_inst_setname(struct crypto_instance *inst, const char *name, 928 struct crypto_alg *alg) 929 { 930 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 931 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 932 return -ENAMETOOLONG; 933 934 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", 935 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 936 return -ENAMETOOLONG; 937 938 return 0; 939 } 940 EXPORT_SYMBOL_GPL(crypto_inst_setname); 941 942 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 943 { 944 INIT_LIST_HEAD(&queue->list); 945 queue->backlog = &queue->list; 946 queue->qlen = 0; 947 queue->max_qlen = max_qlen; 948 } 949 EXPORT_SYMBOL_GPL(crypto_init_queue); 950 951 int crypto_enqueue_request(struct crypto_queue *queue, 952 struct crypto_async_request *request) 953 { 954 int err = -EINPROGRESS; 955 956 if (unlikely(queue->qlen >= queue->max_qlen)) { 957 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) { 958 err = -ENOSPC; 959 goto out; 960 } 961 err = -EBUSY; 962 if (queue->backlog == &queue->list) 963 queue->backlog = &request->list; 964 } 965 966 queue->qlen++; 967 list_add_tail(&request->list, &queue->list); 968 969 out: 970 return err; 971 } 972 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 973 974 void crypto_enqueue_request_head(struct crypto_queue *queue, 975 struct crypto_async_request *request) 976 { 977 if (unlikely(queue->qlen >= queue->max_qlen)) 978 queue->backlog = queue->backlog->prev; 979 980 queue->qlen++; 981 list_add(&request->list, &queue->list); 982 } 983 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head); 984 985 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 986 { 987 struct list_head *request; 988 989 if (unlikely(!queue->qlen)) 990 return NULL; 991 992 queue->qlen--; 993 994 if (queue->backlog != &queue->list) 995 queue->backlog = queue->backlog->next; 996 997 request = queue->list.next; 998 list_del(request); 999 1000 return list_entry(request, struct crypto_async_request, list); 1001 } 1002 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 1003 1004 static inline void crypto_inc_byte(u8 *a, unsigned int size) 1005 { 1006 u8 *b = (a + size); 1007 u8 c; 1008 1009 for (; size; size--) { 1010 c = *--b + 1; 1011 *b = c; 1012 if (c) 1013 break; 1014 } 1015 } 1016 1017 void crypto_inc(u8 *a, unsigned int size) 1018 { 1019 __be32 *b = (__be32 *)(a + size); 1020 u32 c; 1021 1022 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || 1023 IS_ALIGNED((unsigned long)b, __alignof__(*b))) 1024 for (; size >= 4; size -= 4) { 1025 c = be32_to_cpu(*--b) + 1; 1026 *b = cpu_to_be32(c); 1027 if (likely(c)) 1028 return; 1029 } 1030 1031 crypto_inc_byte(a, size); 1032 } 1033 EXPORT_SYMBOL_GPL(crypto_inc); 1034 1035 unsigned int crypto_alg_extsize(struct crypto_alg *alg) 1036 { 1037 return alg->cra_ctxsize + 1038 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); 1039 } 1040 EXPORT_SYMBOL_GPL(crypto_alg_extsize); 1041 1042 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend, 1043 u32 type, u32 mask) 1044 { 1045 int ret = 0; 1046 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask); 1047 1048 if (!IS_ERR(alg)) { 1049 crypto_mod_put(alg); 1050 ret = 1; 1051 } 1052 1053 return ret; 1054 } 1055 EXPORT_SYMBOL_GPL(crypto_type_has_alg); 1056 1057 static void __init crypto_start_tests(void) 1058 { 1059 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS)) 1060 return; 1061 1062 for (;;) { 1063 struct crypto_larval *larval = NULL; 1064 struct crypto_alg *q; 1065 1066 down_write(&crypto_alg_sem); 1067 1068 list_for_each_entry(q, &crypto_alg_list, cra_list) { 1069 struct crypto_larval *l; 1070 1071 if (!crypto_is_larval(q)) 1072 continue; 1073 1074 l = (void *)q; 1075 1076 if (!crypto_is_test_larval(l)) 1077 continue; 1078 1079 if (l->test_started) 1080 continue; 1081 1082 l->test_started = true; 1083 larval = l; 1084 break; 1085 } 1086 1087 up_write(&crypto_alg_sem); 1088 1089 if (!larval) 1090 break; 1091 1092 crypto_wait_for_test(larval); 1093 } 1094 1095 set_crypto_boot_test_finished(); 1096 } 1097 1098 static int __init crypto_algapi_init(void) 1099 { 1100 crypto_init_proc(); 1101 crypto_start_tests(); 1102 return 0; 1103 } 1104 1105 static void __exit crypto_algapi_exit(void) 1106 { 1107 crypto_exit_proc(); 1108 } 1109 1110 /* 1111 * We run this at late_initcall so that all the built-in algorithms 1112 * have had a chance to register themselves first. 1113 */ 1114 late_initcall(crypto_algapi_init); 1115 module_exit(crypto_algapi_exit); 1116 1117 MODULE_LICENSE("GPL"); 1118 MODULE_DESCRIPTION("Cryptographic algorithms API"); 1119 MODULE_SOFTDEP("pre: cryptomgr"); 1120