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_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(ptr: larval)) |
351 | goto out; |
352 | |
353 | list_add(new: &alg->cra_list, head: &crypto_alg_list); |
354 | |
355 | if (larval) { |
356 | /* No cheating! */ |
357 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; |
358 | |
359 | list_add(new: &larval->alg.cra_list, head: &crypto_alg_list); |
360 | } else { |
361 | alg->cra_flags |= CRYPTO_ALG_TESTED; |
362 | crypto_alg_finish_registration(alg, fulfill_requests: true, algs_to_put); |
363 | } |
364 | |
365 | out: |
366 | return larval; |
367 | |
368 | err: |
369 | larval = ERR_PTR(error: 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(sem: &crypto_alg_sem); |
382 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
383 | if (crypto_is_moribund(alg: q) || !crypto_is_larval(alg: 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(head: &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(alg: q) || !crypto_is_larval(alg: 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, fulfill_requests: best, algs_to_put: &list); |
430 | |
431 | complete: |
432 | complete_all(&test->completion); |
433 | |
434 | unlock: |
435 | up_write(sem: &crypto_alg_sem); |
436 | |
437 | crypto_remove_final(list: &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(entry: &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(sem: &crypto_alg_sem); |
466 | larval = __crypto_register_alg(alg, algs_to_put: &algs_to_put); |
467 | if (!IS_ERR_OR_NULL(ptr: larval)) { |
468 | test_started = crypto_boot_test_finished(); |
469 | larval->test_started = test_started; |
470 | } |
471 | up_write(sem: &crypto_alg_sem); |
472 | |
473 | if (IS_ERR(ptr: larval)) |
474 | return PTR_ERR(ptr: 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(entry: &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(sem: &crypto_alg_sem); |
501 | ret = crypto_remove_alg(alg, list: &list); |
502 | up_write(sem: &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(sem: &crypto_alg_sem); |
552 | |
553 | crypto_check_module_sig(mod: 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(new: &tmpl->list, head: &crypto_template_list); |
561 | err = 0; |
562 | out: |
563 | up_write(sem: &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(tmpl: &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(sem: &crypto_alg_sem); |
594 | |
595 | BUG_ON(list_empty(&tmpl->list)); |
596 | list_del_init(entry: &tmpl->list); |
597 | |
598 | list = &tmpl->instances; |
599 | hlist_for_each_entry(inst, list, list) { |
600 | int err = crypto_remove_alg(alg: &inst->alg, list: &users); |
601 | |
602 | BUG_ON(err); |
603 | } |
604 | |
605 | up_write(sem: &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(sem: &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(sem: &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(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(sem: &crypto_alg_sem); |
667 | |
668 | larval = ERR_PTR(error: -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(alg: 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(alg: &inst->alg, algs_to_put: &algs_to_put); |
689 | if (IS_ERR(ptr: larval)) |
690 | goto unlock; |
691 | else if (larval) |
692 | larval->test_started = true; |
693 | |
694 | hlist_add_head(n: &inst->list, h: &tmpl->instances); |
695 | inst->tmpl = tmpl; |
696 | |
697 | unlock: |
698 | up_write(sem: &crypto_alg_sem); |
699 | |
700 | if (IS_ERR(ptr: larval)) |
701 | return PTR_ERR(ptr: 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(sem: &crypto_alg_sem); |
714 | |
715 | crypto_remove_spawns(&inst->alg, &list, NULL); |
716 | crypto_remove_instance(inst, list: &list); |
717 | |
718 | up_write(sem: &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(ptr: name)) |
735 | return PTR_ERR(ptr: name); |
736 | |
737 | alg = crypto_find_alg(alg_name: name, frontend: spawn->frontend, |
738 | type: type | CRYPTO_ALG_FIPS_INTERNAL, mask); |
739 | if (IS_ERR(ptr: alg)) |
740 | return PTR_ERR(ptr: alg); |
741 | |
742 | down_write(sem: &crypto_alg_sem); |
743 | if (!crypto_is_moribund(alg)) { |
744 | list_add(new: &spawn->list, head: &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(sem: &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(sem: &crypto_alg_sem); |
766 | if (!spawn->dead) |
767 | list_del(entry: &spawn->list); |
768 | up_write(sem: &crypto_alg_sem); |
769 | |
770 | if (!spawn->registered) |
771 | crypto_mod_put(alg: 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(error: -EAGAIN); |
778 | struct crypto_alg *target; |
779 | bool shoot = false; |
780 | |
781 | down_read(sem: &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(error: -EAGAIN); |
788 | } |
789 | } |
790 | up_read(sem: &crypto_alg_sem); |
791 | |
792 | if (shoot) { |
793 | crypto_shoot_alg(alg: target); |
794 | crypto_alg_put(alg: 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(ptr: alg)) |
808 | return ERR_CAST(ptr: alg); |
809 | |
810 | tfm = ERR_PTR(error: -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(ptr: 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(ptr: alg)) |
833 | return ERR_CAST(ptr: alg); |
834 | |
835 | tfm = crypto_create_tfm(alg, frontend: spawn->frontend); |
836 | if (IS_ERR(ptr: 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(nh: &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(nh: &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(error: -ENOENT); |
866 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) |
867 | return ERR_PTR(error: -EINVAL); |
868 | if (rta->rta_type != CRYPTOA_TYPE) |
869 | return ERR_PTR(error: -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(ptr: algt)) |
899 | return PTR_ERR(ptr: 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(error: -ENOENT); |
915 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) |
916 | return ERR_PTR(error: -EINVAL); |
917 | if (rta->rta_type != CRYPTOA_ALG) |
918 | return ERR_PTR(error: -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(buf: inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, fmt: "%s(%s)" , name, |
931 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) |
932 | return -ENAMETOOLONG; |
933 | |
934 | if (snprintf(buf: inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, fmt: "%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(list: &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(new: &request->list, head: &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(new: &request->list, head: &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(entry: 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(alg_name: name, frontend, type, mask); |
1047 | |
1048 | if (!IS_ERR(ptr: 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(sem: &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(alg: q)) |
1072 | continue; |
1073 | |
1074 | l = (void *)q; |
1075 | |
1076 | if (!crypto_is_test_larval(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(sem: &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 | |