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(module: mod)) |
34 | panic(fmt: "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(mod: 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(r: &alg->cra_refcnt, n: 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(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(list: &spawn->list, head: secondary_spawns); |
120 | |
121 | if (list_is_last(list: &n->list, head: 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(alg: &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(list: &inst->alg.cra_list, head: list); |
145 | hlist_del(n: &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(list: &spawn->list, head: &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(head: 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(list: &spawn->list, head: &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: &stack, top: &top, |
221 | secondary_spawns: &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(list: &spawn->list, head: &spawn->alg->cra_users); |
231 | else if (spawn->registered) |
232 | crypto_remove_instance(inst: 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(alg: q)) |
248 | continue; |
249 | |
250 | if (crypto_is_larval(alg: 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(error: -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(val: CRYPTO_MSG_ALG_LOADED, v: 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(name: alg->cra_name, |
298 | type: alg->cra_flags | CRYPTO_ALG_TESTED, mask: 0); |
299 | if (IS_ERR(ptr: larval)) |
300 | return larval; |
301 | |
302 | larval->adult = crypto_mod_get(alg); |
303 | if (!larval->adult) { |
304 | kfree(objp: larval); |
305 | return ERR_PTR(error: -ENOENT); |
306 | } |
307 | |
308 | refcount_set(r: &larval->alg.cra_refcnt, n: 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(list: &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(alg: q)) |
335 | continue; |
336 | |
337 | if (crypto_is_larval(alg: 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(ptr: larval)) |
350 | goto out; |
351 | |
352 | list_add(new: &alg->cra_list, head: &crypto_alg_list); |
353 | |
354 | if (larval) { |
355 | /* No cheating! */ |
356 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; |
357 | |
358 | list_add(new: &larval->alg.cra_list, head: &crypto_alg_list); |
359 | } else { |
360 | alg->cra_flags |= CRYPTO_ALG_TESTED; |
361 | crypto_alg_finish_registration(alg, fulfill_requests: true, algs_to_put); |
362 | } |
363 | |
364 | out: |
365 | return larval; |
366 | |
367 | err: |
368 | larval = ERR_PTR(error: 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(sem: &crypto_alg_sem); |
381 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
382 | if (crypto_is_moribund(alg: q) || !crypto_is_larval(alg: 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(head: &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(alg: q) || !crypto_is_larval(alg: 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, fulfill_requests: best, algs_to_put: &list); |
429 | |
430 | complete: |
431 | complete_all(&test->completion); |
432 | |
433 | unlock: |
434 | up_write(sem: &crypto_alg_sem); |
435 | |
436 | crypto_remove_final(list: &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(entry: &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(sem: &crypto_alg_sem); |
465 | larval = __crypto_register_alg(alg, algs_to_put: &algs_to_put); |
466 | if (!IS_ERR_OR_NULL(ptr: larval)) { |
467 | test_started = crypto_boot_test_finished(); |
468 | larval->test_started = test_started; |
469 | } |
470 | up_write(sem: &crypto_alg_sem); |
471 | |
472 | if (IS_ERR(ptr: larval)) |
473 | return PTR_ERR(ptr: 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(entry: &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(sem: &crypto_alg_sem); |
500 | ret = crypto_remove_alg(alg, list: &list); |
501 | up_write(sem: &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(sem: &crypto_alg_sem); |
551 | |
552 | crypto_check_module_sig(mod: 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(new: &tmpl->list, head: &crypto_template_list); |
560 | err = 0; |
561 | out: |
562 | up_write(sem: &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(tmpl: &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(sem: &crypto_alg_sem); |
593 | |
594 | BUG_ON(list_empty(&tmpl->list)); |
595 | list_del_init(entry: &tmpl->list); |
596 | |
597 | list = &tmpl->instances; |
598 | hlist_for_each_entry(inst, list, list) { |
599 | int err = crypto_remove_alg(alg: &inst->alg, list: &users); |
600 | |
601 | BUG_ON(err); |
602 | } |
603 | |
604 | up_write(sem: &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(sem: &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(sem: &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(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(sem: &crypto_alg_sem); |
666 | |
667 | larval = ERR_PTR(error: -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(alg: 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(alg: &inst->alg, algs_to_put: &algs_to_put); |
688 | if (IS_ERR(ptr: larval)) |
689 | goto unlock; |
690 | else if (larval) |
691 | larval->test_started = true; |
692 | |
693 | hlist_add_head(n: &inst->list, h: &tmpl->instances); |
694 | inst->tmpl = tmpl; |
695 | |
696 | unlock: |
697 | up_write(sem: &crypto_alg_sem); |
698 | |
699 | if (IS_ERR(ptr: larval)) |
700 | return PTR_ERR(ptr: 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(sem: &crypto_alg_sem); |
713 | |
714 | crypto_remove_spawns(&inst->alg, &list, NULL); |
715 | crypto_remove_instance(inst, list: &list); |
716 | |
717 | up_write(sem: &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(ptr: name)) |
734 | return PTR_ERR(ptr: name); |
735 | |
736 | alg = crypto_find_alg(alg_name: name, frontend: spawn->frontend, |
737 | type: type | CRYPTO_ALG_FIPS_INTERNAL, mask); |
738 | if (IS_ERR(ptr: alg)) |
739 | return PTR_ERR(ptr: alg); |
740 | |
741 | down_write(sem: &crypto_alg_sem); |
742 | if (!crypto_is_moribund(alg)) { |
743 | list_add(new: &spawn->list, head: &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(sem: &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(sem: &crypto_alg_sem); |
765 | if (!spawn->dead) |
766 | list_del(entry: &spawn->list); |
767 | up_write(sem: &crypto_alg_sem); |
768 | |
769 | if (!spawn->registered) |
770 | crypto_mod_put(alg: 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(error: -EAGAIN); |
777 | struct crypto_alg *target; |
778 | bool shoot = false; |
779 | |
780 | down_read(sem: &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(error: -EAGAIN); |
787 | } |
788 | } |
789 | up_read(sem: &crypto_alg_sem); |
790 | |
791 | if (shoot) { |
792 | crypto_shoot_alg(alg: target); |
793 | crypto_alg_put(alg: 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(ptr: alg)) |
807 | return ERR_CAST(ptr: alg); |
808 | |
809 | tfm = ERR_PTR(error: -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(ptr: 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(ptr: alg)) |
832 | return ERR_CAST(ptr: alg); |
833 | |
834 | tfm = crypto_create_tfm(alg, frontend: spawn->frontend); |
835 | if (IS_ERR(ptr: 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(nh: &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(nh: &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(error: -ENOENT); |
865 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) |
866 | return ERR_PTR(error: -EINVAL); |
867 | if (rta->rta_type != CRYPTOA_TYPE) |
868 | return ERR_PTR(error: -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(ptr: algt)) |
898 | return PTR_ERR(ptr: 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(error: -ENOENT); |
914 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) |
915 | return ERR_PTR(error: -EINVAL); |
916 | if (rta->rta_type != CRYPTOA_ALG) |
917 | return ERR_PTR(error: -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(buf: inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, fmt: "%s(%s)" , name, |
930 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) |
931 | return -ENAMETOOLONG; |
932 | |
933 | if (snprintf(buf: inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, fmt: "%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(list: &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(new: &request->list, head: &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(new: &request->list, head: &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(entry: 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(alg_name: name, frontend, type, mask); |
1046 | |
1047 | if (!IS_ERR(ptr: 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(sem: &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(alg: q)) |
1071 | continue; |
1072 | |
1073 | l = (void *)q; |
1074 | |
1075 | if (!crypto_is_test_larval(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(sem: &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 | |