| 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"); |