projects/linux·blob v6.4 · refs

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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 <[email protected]>
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
23static LIST_HEAD(crypto_template_list);
24
25#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
26DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
27EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
28#endif
29
30static 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
37static 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
72static void crypto_free_instance(struct crypto_instance *inst)
73{
74 inst->alg.cra_type->free(inst);
75}
76
77static 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 */
95static 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
119static 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 */
145void 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 = &top;
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}
223EXPORT_SYMBOL_GPL(crypto_remove_spawns);
224
225static 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
276static 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
304static 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
352out:
353 return larval;
354
355err:
356 larval = ERR_PTR(ret);
357 goto out;
358}
359
360void 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
382found:
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
418complete:
419 complete_all(&test->completion);
420
421unlock:
422 up_write(&crypto_alg_sem);
423
424 crypto_remove_final(&list);
425}
426EXPORT_SYMBOL_GPL(crypto_alg_tested);
427
428void 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}
438EXPORT_SYMBOL_GPL(crypto_remove_final);
439
440int 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}
467EXPORT_SYMBOL_GPL(crypto_register_alg);
468
469static 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
482void 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}
502EXPORT_SYMBOL_GPL(crypto_unregister_alg);
503
504int 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
516err:
517 for (--i; i >= 0; --i)
518 crypto_unregister_alg(&algs[i]);
519
520 return ret;
521}
522EXPORT_SYMBOL_GPL(crypto_register_algs);
523
524void 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}
531EXPORT_SYMBOL_GPL(crypto_unregister_algs);
532
533int 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;
549out:
550 up_write(&crypto_alg_sem);
551 return err;
552}
553EXPORT_SYMBOL_GPL(crypto_register_template);
554
555int 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
566out:
567 for (--i; i >= 0; --i)
568 crypto_unregister_template(&tmpls[i]);
569 return err;
570}
571EXPORT_SYMBOL_GPL(crypto_register_templates);
572
573void 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}
600EXPORT_SYMBOL_GPL(crypto_unregister_template);
601
602void 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}
609EXPORT_SYMBOL_GPL(crypto_unregister_templates);
610
611static 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
630struct crypto_template *crypto_lookup_template(const char *name)
631{
632 return try_then_request_module(__crypto_lookup_template(name),
633 "crypto-%s", name);
634}
635EXPORT_SYMBOL_GPL(crypto_lookup_template);
636
637int 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
684unlock:
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}
694EXPORT_SYMBOL_GPL(crypto_register_instance);
695
696void 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}
709EXPORT_SYMBOL_GPL(crypto_unregister_instance);
710
711int 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}
745EXPORT_SYMBOL_GPL(crypto_grab_spawn);
746
747void 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}
760EXPORT_SYMBOL_GPL(crypto_drop_spawn);
761
762static 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
787struct 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
807out_put_alg:
808 crypto_mod_put(alg);
809 return tfm;
810}
811EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
812
813void *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
828out_put_alg:
829 crypto_mod_put(alg);
830 return tfm;
831}
832EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
833
834int crypto_register_notifier(struct notifier_block *nb)
835{
836 return blocking_notifier_chain_register(&crypto_chain, nb);
837}
838EXPORT_SYMBOL_GPL(crypto_register_notifier);
839
840int crypto_unregister_notifier(struct notifier_block *nb)
841{
842 return blocking_notifier_chain_unregister(&crypto_chain, nb);
843}
844EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
845
846struct 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}
862EXPORT_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 */
880int 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}
894EXPORT_SYMBOL_GPL(crypto_check_attr_type);
895
896const 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}
912EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
913
914int 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}
927EXPORT_SYMBOL_GPL(crypto_inst_setname);
928
929void 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}
936EXPORT_SYMBOL_GPL(crypto_init_queue);
937
938int 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
956out:
957 return err;
958}
959EXPORT_SYMBOL_GPL(crypto_enqueue_request);
960
961void 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}
970EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
971
972struct 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}
989EXPORT_SYMBOL_GPL(crypto_dequeue_request);
990
991static 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
1004void 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}
1020EXPORT_SYMBOL_GPL(crypto_inc);
1021
1022unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1023{
1024 return alg->cra_ctxsize +
1025 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1026}
1027EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1028
1029int 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}
1042EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1043
1044static 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
1085static int __init crypto_algapi_init(void)
1086{
1087 crypto_init_proc();
1088 crypto_start_tests();
1089 return 0;
1090}
1091
1092static 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 */
1101late_initcall(crypto_algapi_init);
1102module_exit(crypto_algapi_exit);
1103
1104MODULE_LICENSE("GPL");
1105MODULE_DESCRIPTION("Cryptographic algorithms API");
1106MODULE_SOFTDEP("pre: cryptomgr");