Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <linux/err.h>
10#include <linux/errno.h>
11#include <linux/fips.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/list.h>
15#include <linux/module.h>
16#include <linux/rtnetlink.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19#include <linux/workqueue.h>
20
21#include "internal.h"
22
23static LIST_HEAD(crypto_template_list);
24
25static inline void crypto_check_module_sig(struct module *mod)
26{
27 if (fips_enabled && mod && !module_sig_ok(mod))
28 panic("Module %s signature verification failed in FIPS mode\n",
29 module_name(mod));
30}
31
32static int crypto_check_alg(struct crypto_alg *alg)
33{
34 crypto_check_module_sig(alg->cra_module);
35
36 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
37 return -EINVAL;
38
39 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
40 return -EINVAL;
41
42 /* General maximums for all algs. */
43 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
44 return -EINVAL;
45
46 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
47 return -EINVAL;
48
49 /* Lower maximums for specific alg types. */
50 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
51 CRYPTO_ALG_TYPE_CIPHER) {
52 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
53 return -EINVAL;
54
55 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
56 return -EINVAL;
57 }
58
59 if (alg->cra_priority < 0)
60 return -EINVAL;
61
62 refcount_set(&alg->cra_refcnt, 1);
63
64 return 0;
65}
66
67static void crypto_free_instance(struct crypto_instance *inst)
68{
69 inst->alg.cra_type->free(inst);
70}
71
72static void crypto_destroy_instance_workfn(struct work_struct *w)
73{
74 struct crypto_template *tmpl = container_of(w, struct crypto_template,
75 free_work);
76 struct crypto_instance *inst;
77 struct hlist_node *n;
78 HLIST_HEAD(list);
79
80 down_write(&crypto_alg_sem);
81 hlist_for_each_entry_safe(inst, n, &tmpl->dead, list) {
82 if (refcount_read(&inst->alg.cra_refcnt) != -1)
83 continue;
84 hlist_del(&inst->list);
85 hlist_add_head(&inst->list, &list);
86 }
87 up_write(&crypto_alg_sem);
88
89 hlist_for_each_entry_safe(inst, n, &list, list)
90 crypto_free_instance(inst);
91}
92
93static void crypto_destroy_instance(struct crypto_alg *alg)
94{
95 struct crypto_instance *inst = container_of(alg,
96 struct crypto_instance,
97 alg);
98 struct crypto_template *tmpl = inst->tmpl;
99
100 refcount_set(&alg->cra_refcnt, -1);
101 schedule_work(&tmpl->free_work);
102}
103
104/*
105 * This function adds a spawn to the list secondary_spawns which
106 * will be used at the end of crypto_remove_spawns to unregister
107 * instances, unless the spawn happens to be one that is depended
108 * on by the new algorithm (nalg in crypto_remove_spawns).
109 *
110 * This function is also responsible for resurrecting any algorithms
111 * in the dependency chain of nalg by unsetting n->dead.
112 */
113static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
114 struct list_head *stack,
115 struct list_head *top,
116 struct list_head *secondary_spawns)
117{
118 struct crypto_spawn *spawn, *n;
119
120 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
121 if (!spawn)
122 return NULL;
123
124 n = list_prev_entry(spawn, list);
125 list_move(&spawn->list, secondary_spawns);
126
127 if (list_is_last(&n->list, stack))
128 return top;
129
130 n = list_next_entry(n, list);
131 if (!spawn->dead)
132 n->dead = false;
133
134 return &n->inst->alg.cra_users;
135}
136
137static void crypto_remove_instance(struct crypto_instance *inst,
138 struct list_head *list)
139{
140 struct crypto_template *tmpl = inst->tmpl;
141
142 if (crypto_is_dead(&inst->alg))
143 return;
144
145 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
146
147 if (!tmpl)
148 return;
149
150 list_del_init(&inst->alg.cra_list);
151 hlist_del(&inst->list);
152 hlist_add_head(&inst->list, &tmpl->dead);
153
154 BUG_ON(!list_empty(&inst->alg.cra_users));
155
156 crypto_alg_put(&inst->alg);
157}
158
159/*
160 * Given an algorithm alg, remove all algorithms that depend on it
161 * through spawns. If nalg is not null, then exempt any algorithms
162 * that is depended on by nalg. This is useful when nalg itself
163 * depends on alg.
164 */
165void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
166 struct crypto_alg *nalg)
167{
168 u32 new_type = (nalg ?: alg)->cra_flags;
169 struct crypto_spawn *spawn, *n;
170 LIST_HEAD(secondary_spawns);
171 struct list_head *spawns;
172 LIST_HEAD(stack);
173 LIST_HEAD(top);
174
175 spawns = &alg->cra_users;
176 list_for_each_entry_safe(spawn, n, spawns, list) {
177 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
178 continue;
179
180 list_move(&spawn->list, &top);
181 }
182
183 /*
184 * Perform a depth-first walk starting from alg through
185 * the cra_users tree. The list stack records the path
186 * from alg to the current spawn.
187 */
188 spawns = ⊤
189 do {
190 while (!list_empty(spawns)) {
191 struct crypto_instance *inst;
192
193 spawn = list_first_entry(spawns, struct crypto_spawn,
194 list);
195 inst = spawn->inst;
196
197 list_move(&spawn->list, &stack);
198 spawn->dead = !spawn->registered || &inst->alg != nalg;
199
200 if (!spawn->registered)
201 break;
202
203 BUG_ON(&inst->alg == alg);
204
205 if (&inst->alg == nalg)
206 break;
207
208 spawns = &inst->alg.cra_users;
209
210 /*
211 * Even if spawn->registered is true, the
212 * instance itself may still be unregistered.
213 * This is because it may have failed during
214 * registration. Therefore we still need to
215 * make the following test.
216 *
217 * We may encounter an unregistered instance here, since
218 * an instance's spawns are set up prior to the instance
219 * being registered. An unregistered instance will have
220 * NULL ->cra_users.next, since ->cra_users isn't
221 * properly initialized until registration. But an
222 * unregistered instance cannot have any users, so treat
223 * it the same as ->cra_users being empty.
224 */
225 if (spawns->next == NULL)
226 break;
227 }
228 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
229 &secondary_spawns)));
230
231 /*
232 * Remove all instances that are marked as dead. Also
233 * complete the resurrection of the others by moving them
234 * back to the cra_users list.
235 */
236 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
237 if (!spawn->dead)
238 list_move(&spawn->list, &spawn->alg->cra_users);
239 else if (spawn->registered)
240 crypto_remove_instance(spawn->inst, list);
241 }
242}
243EXPORT_SYMBOL_GPL(crypto_remove_spawns);
244
245static void crypto_alg_finish_registration(struct crypto_alg *alg,
246 struct list_head *algs_to_put)
247 __must_hold(&crypto_alg_sem)
248{
249 struct crypto_alg *q;
250
251 list_for_each_entry(q, &crypto_alg_list, cra_list) {
252 if (q == alg)
253 continue;
254
255 if (crypto_is_moribund(q))
256 continue;
257
258 if (crypto_is_larval(q))
259 continue;
260
261 if (strcmp(alg->cra_name, q->cra_name))
262 continue;
263
264 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
265 q->cra_priority > alg->cra_priority)
266 continue;
267
268 crypto_remove_spawns(q, algs_to_put, alg);
269 }
270
271 crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
272}
273
274static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
275{
276 struct crypto_larval *larval;
277
278 if (!IS_ENABLED(CONFIG_CRYPTO_SELFTESTS) ||
279 (alg->cra_flags & CRYPTO_ALG_INTERNAL))
280 return NULL; /* No self-test needed */
281
282 larval = crypto_larval_alloc(alg->cra_name,
283 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
284 if (IS_ERR(larval))
285 return larval;
286
287 larval->adult = crypto_mod_get(alg);
288 if (!larval->adult) {
289 kfree(larval);
290 return ERR_PTR(-ENOENT);
291 }
292
293 refcount_set(&larval->alg.cra_refcnt, 1);
294 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
295 CRYPTO_MAX_ALG_NAME);
296 larval->alg.cra_priority = alg->cra_priority;
297
298 return larval;
299}
300
301static struct crypto_larval *
302__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
303 __must_hold(&crypto_alg_sem)
304{
305 struct crypto_alg *q;
306 struct crypto_larval *larval;
307 int ret = -EAGAIN;
308
309 if (crypto_is_dead(alg))
310 goto err;
311
312 INIT_LIST_HEAD(&alg->cra_users);
313
314 ret = -EEXIST;
315
316 list_for_each_entry(q, &crypto_alg_list, cra_list) {
317 if (q == alg)
318 goto err;
319
320 if (crypto_is_moribund(q))
321 continue;
322
323 if (crypto_is_larval(q)) {
324 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
325 goto err;
326 continue;
327 }
328
329 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
330 !strcmp(q->cra_driver_name, alg->cra_driver_name) ||
331 !strcmp(q->cra_name, alg->cra_driver_name))
332 goto err;
333 }
334
335 larval = crypto_alloc_test_larval(alg);
336 if (IS_ERR(larval))
337 goto out;
338
339 list_add(&alg->cra_list, &crypto_alg_list);
340
341 if (larval) {
342 /* No cheating! */
343 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
344
345 list_add(&larval->alg.cra_list, &crypto_alg_list);
346 } else {
347 alg->cra_flags |= CRYPTO_ALG_TESTED;
348 crypto_alg_finish_registration(alg, algs_to_put);
349 }
350
351out:
352 return larval;
353
354err:
355 larval = ERR_PTR(ret);
356 goto out;
357}
358
359void crypto_alg_tested(const char *name, int err)
360{
361 struct crypto_larval *test;
362 struct crypto_alg *alg;
363 struct crypto_alg *q;
364 LIST_HEAD(list);
365
366 down_write(&crypto_alg_sem);
367 list_for_each_entry(q, &crypto_alg_list, cra_list) {
368 if (crypto_is_moribund(q) || !crypto_is_larval(q))
369 continue;
370
371 test = (struct crypto_larval *)q;
372
373 if (!strcmp(q->cra_driver_name, name))
374 goto found;
375 }
376
377 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
378 up_write(&crypto_alg_sem);
379 return;
380
381found:
382 q->cra_flags |= CRYPTO_ALG_DEAD;
383 alg = test->adult;
384
385 if (crypto_is_dead(alg))
386 goto complete;
387
388 if (err == -ECANCELED)
389 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
390 else if (err)
391 goto complete;
392 else
393 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
394
395 alg->cra_flags |= CRYPTO_ALG_TESTED;
396
397 crypto_alg_finish_registration(alg, &list);
398
399complete:
400 list_del_init(&test->alg.cra_list);
401 complete_all(&test->completion);
402
403 up_write(&crypto_alg_sem);
404
405 crypto_alg_put(&test->alg);
406 crypto_remove_final(&list);
407}
408EXPORT_SYMBOL_GPL(crypto_alg_tested);
409
410void crypto_remove_final(struct list_head *list)
411{
412 struct crypto_alg *alg;
413 struct crypto_alg *n;
414
415 list_for_each_entry_safe(alg, n, list, cra_list) {
416 list_del_init(&alg->cra_list);
417 crypto_alg_put(alg);
418 }
419}
420EXPORT_SYMBOL_GPL(crypto_remove_final);
421
422static void crypto_free_alg(struct crypto_alg *alg)
423{
424 unsigned int algsize = alg->cra_type->algsize;
425 u8 *p = (u8 *)alg - algsize;
426
427 crypto_destroy_alg(alg);
428 kfree(p);
429}
430
431int crypto_register_alg(struct crypto_alg *alg)
432{
433 struct crypto_larval *larval;
434 bool test_started = false;
435 LIST_HEAD(algs_to_put);
436 int err;
437
438 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
439 err = crypto_check_alg(alg);
440 if (err)
441 return err;
442
443 if (alg->cra_flags & CRYPTO_ALG_DUP_FIRST &&
444 !WARN_ON_ONCE(alg->cra_destroy)) {
445 unsigned int algsize = alg->cra_type->algsize;
446 u8 *p = (u8 *)alg - algsize;
447
448 p = kmemdup(p, algsize + sizeof(*alg), GFP_KERNEL);
449 if (!p)
450 return -ENOMEM;
451
452 alg = (void *)(p + algsize);
453 alg->cra_destroy = crypto_free_alg;
454 }
455
456 down_write(&crypto_alg_sem);
457 larval = __crypto_register_alg(alg, &algs_to_put);
458 if (!IS_ERR_OR_NULL(larval)) {
459 test_started = crypto_boot_test_finished();
460 larval->test_started = test_started;
461 }
462 up_write(&crypto_alg_sem);
463
464 if (IS_ERR(larval)) {
465 crypto_alg_put(alg);
466 return PTR_ERR(larval);
467 }
468
469 if (test_started)
470 crypto_schedule_test(larval);
471 else
472 crypto_remove_final(&algs_to_put);
473
474 return 0;
475}
476EXPORT_SYMBOL_GPL(crypto_register_alg);
477
478static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
479{
480 if (unlikely(list_empty(&alg->cra_list)))
481 return -ENOENT;
482
483 alg->cra_flags |= CRYPTO_ALG_DEAD;
484
485 list_del_init(&alg->cra_list);
486 crypto_remove_spawns(alg, list, NULL);
487
488 return 0;
489}
490
491void crypto_unregister_alg(struct crypto_alg *alg)
492{
493 int ret;
494 LIST_HEAD(list);
495
496 down_write(&crypto_alg_sem);
497 ret = crypto_remove_alg(alg, &list);
498 up_write(&crypto_alg_sem);
499
500 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
501 return;
502
503 WARN_ON(!alg->cra_destroy && refcount_read(&alg->cra_refcnt) != 1);
504
505 list_add(&alg->cra_list, &list);
506 crypto_remove_final(&list);
507}
508EXPORT_SYMBOL_GPL(crypto_unregister_alg);
509
510int crypto_register_algs(struct crypto_alg *algs, int count)
511{
512 int i, ret;
513
514 for (i = 0; i < count; i++) {
515 ret = crypto_register_alg(&algs[i]);
516 if (ret) {
517 crypto_unregister_algs(algs, i);
518 return ret;
519 }
520 }
521
522 return 0;
523}
524EXPORT_SYMBOL_GPL(crypto_register_algs);
525
526void crypto_unregister_algs(struct crypto_alg *algs, int count)
527{
528 int i;
529
530 for (i = count - 1; i >= 0; --i)
531 crypto_unregister_alg(&algs[i]);
532}
533EXPORT_SYMBOL_GPL(crypto_unregister_algs);
534
535int crypto_register_template(struct crypto_template *tmpl)
536{
537 struct crypto_template *q;
538 int err = -EEXIST;
539
540 INIT_WORK(&tmpl->free_work, crypto_destroy_instance_workfn);
541
542 down_write(&crypto_alg_sem);
543
544 crypto_check_module_sig(tmpl->module);
545
546 list_for_each_entry(q, &crypto_template_list, list) {
547 if (q == tmpl)
548 goto out;
549 }
550
551 list_add(&tmpl->list, &crypto_template_list);
552 err = 0;
553out:
554 up_write(&crypto_alg_sem);
555 return err;
556}
557EXPORT_SYMBOL_GPL(crypto_register_template);
558
559int crypto_register_templates(struct crypto_template *tmpls, int count)
560{
561 int i, err;
562
563 for (i = 0; i < count; i++) {
564 err = crypto_register_template(&tmpls[i]);
565 if (err)
566 goto out;
567 }
568 return 0;
569
570out:
571 for (--i; i >= 0; --i)
572 crypto_unregister_template(&tmpls[i]);
573 return err;
574}
575EXPORT_SYMBOL_GPL(crypto_register_templates);
576
577void crypto_unregister_template(struct crypto_template *tmpl)
578{
579 struct crypto_instance *inst;
580 struct hlist_node *n;
581 struct hlist_head *list;
582 LIST_HEAD(users);
583
584 down_write(&crypto_alg_sem);
585
586 BUG_ON(list_empty(&tmpl->list));
587 list_del_init(&tmpl->list);
588
589 list = &tmpl->instances;
590 hlist_for_each_entry(inst, list, list) {
591 int err = crypto_remove_alg(&inst->alg, &users);
592
593 BUG_ON(err);
594 }
595
596 up_write(&crypto_alg_sem);
597
598 hlist_for_each_entry_safe(inst, n, list, list) {
599 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
600 crypto_free_instance(inst);
601 }
602 crypto_remove_final(&users);
603
604 flush_work(&tmpl->free_work);
605}
606EXPORT_SYMBOL_GPL(crypto_unregister_template);
607
608void crypto_unregister_templates(struct crypto_template *tmpls, int count)
609{
610 int i;
611
612 for (i = count - 1; i >= 0; --i)
613 crypto_unregister_template(&tmpls[i]);
614}
615EXPORT_SYMBOL_GPL(crypto_unregister_templates);
616
617static struct crypto_template *__crypto_lookup_template(const char *name)
618{
619 struct crypto_template *q, *tmpl = NULL;
620
621 down_read(&crypto_alg_sem);
622 list_for_each_entry(q, &crypto_template_list, list) {
623 if (strcmp(q->name, name))
624 continue;
625 if (unlikely(!crypto_tmpl_get(q)))
626 continue;
627
628 tmpl = q;
629 break;
630 }
631 up_read(&crypto_alg_sem);
632
633 return tmpl;
634}
635
636struct crypto_template *crypto_lookup_template(const char *name)
637{
638 return try_then_request_module(__crypto_lookup_template(name),
639 "crypto-%s", name);
640}
641EXPORT_SYMBOL_GPL(crypto_lookup_template);
642
643int crypto_register_instance(struct crypto_template *tmpl,
644 struct crypto_instance *inst)
645{
646 struct crypto_larval *larval;
647 struct crypto_spawn *spawn;
648 u32 fips_internal = 0;
649 LIST_HEAD(algs_to_put);
650 int err;
651
652 err = crypto_check_alg(&inst->alg);
653 if (err)
654 return err;
655
656 inst->alg.cra_module = tmpl->module;
657 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
658 inst->alg.cra_destroy = crypto_destroy_instance;
659
660 down_write(&crypto_alg_sem);
661
662 larval = ERR_PTR(-EAGAIN);
663 for (spawn = inst->spawns; spawn;) {
664 struct crypto_spawn *next;
665
666 if (spawn->dead)
667 goto unlock;
668
669 next = spawn->next;
670 spawn->inst = inst;
671 spawn->registered = true;
672
673 fips_internal |= spawn->alg->cra_flags;
674
675 crypto_mod_put(spawn->alg);
676
677 spawn = next;
678 }
679
680 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
681
682 larval = __crypto_register_alg(&inst->alg, &algs_to_put);
683 if (IS_ERR(larval))
684 goto unlock;
685 else if (larval)
686 larval->test_started = true;
687
688 hlist_add_head(&inst->list, &tmpl->instances);
689 inst->tmpl = tmpl;
690
691unlock:
692 up_write(&crypto_alg_sem);
693
694 if (IS_ERR(larval))
695 return PTR_ERR(larval);
696
697 if (larval)
698 crypto_schedule_test(larval);
699 else
700 crypto_remove_final(&algs_to_put);
701
702 return 0;
703}
704EXPORT_SYMBOL_GPL(crypto_register_instance);
705
706void crypto_unregister_instance(struct crypto_instance *inst)
707{
708 LIST_HEAD(list);
709
710 down_write(&crypto_alg_sem);
711
712 crypto_remove_spawns(&inst->alg, &list, NULL);
713 crypto_remove_instance(inst, &list);
714
715 up_write(&crypto_alg_sem);
716
717 crypto_remove_final(&list);
718}
719EXPORT_SYMBOL_GPL(crypto_unregister_instance);
720
721int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
722 const char *name, u32 type, u32 mask)
723{
724 struct crypto_alg *alg;
725 int err = -EAGAIN;
726
727 if (WARN_ON_ONCE(inst == NULL))
728 return -EINVAL;
729
730 /* Allow the result of crypto_attr_alg_name() to be passed directly */
731 if (IS_ERR(name))
732 return PTR_ERR(name);
733
734 alg = crypto_find_alg(name, spawn->frontend,
735 type | CRYPTO_ALG_FIPS_INTERNAL, mask);
736 if (IS_ERR(alg))
737 return PTR_ERR(alg);
738
739 down_write(&crypto_alg_sem);
740 if (!crypto_is_moribund(alg)) {
741 list_add(&spawn->list, &alg->cra_users);
742 spawn->alg = alg;
743 spawn->mask = mask;
744 spawn->next = inst->spawns;
745 inst->spawns = spawn;
746 inst->alg.cra_flags |=
747 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
748 err = 0;
749 }
750 up_write(&crypto_alg_sem);
751 if (err)
752 crypto_mod_put(alg);
753 return err;
754}
755EXPORT_SYMBOL_GPL(crypto_grab_spawn);
756
757void crypto_drop_spawn(struct crypto_spawn *spawn)
758{
759 if (!spawn->alg) /* not yet initialized? */
760 return;
761
762 down_write(&crypto_alg_sem);
763 if (!spawn->dead)
764 list_del(&spawn->list);
765 up_write(&crypto_alg_sem);
766
767 if (!spawn->registered)
768 crypto_mod_put(spawn->alg);
769}
770EXPORT_SYMBOL_GPL(crypto_drop_spawn);
771
772static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
773{
774 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
775 struct crypto_alg *target;
776 bool shoot = false;
777
778 down_read(&crypto_alg_sem);
779 if (!spawn->dead) {
780 alg = spawn->alg;
781 if (!crypto_mod_get(alg)) {
782 target = crypto_alg_get(alg);
783 shoot = true;
784 alg = ERR_PTR(-EAGAIN);
785 }
786 }
787 up_read(&crypto_alg_sem);
788
789 if (shoot) {
790 crypto_shoot_alg(target);
791 crypto_alg_put(target);
792 }
793
794 return alg;
795}
796
797struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
798 u32 mask)
799{
800 struct crypto_alg *alg;
801 struct crypto_tfm *tfm;
802
803 alg = crypto_spawn_alg(spawn);
804 if (IS_ERR(alg))
805 return ERR_CAST(alg);
806
807 tfm = ERR_PTR(-EINVAL);
808 if (unlikely((alg->cra_flags ^ type) & mask))
809 goto out_put_alg;
810
811 tfm = __crypto_alloc_tfm(alg, type, mask);
812 if (IS_ERR(tfm))
813 goto out_put_alg;
814
815 return tfm;
816
817out_put_alg:
818 crypto_mod_put(alg);
819 return tfm;
820}
821EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
822
823void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
824{
825 struct crypto_alg *alg;
826 struct crypto_tfm *tfm;
827
828 alg = crypto_spawn_alg(spawn);
829 if (IS_ERR(alg))
830 return ERR_CAST(alg);
831
832 tfm = crypto_create_tfm(alg, spawn->frontend);
833 if (IS_ERR(tfm))
834 goto out_put_alg;
835
836 return tfm;
837
838out_put_alg:
839 crypto_mod_put(alg);
840 return tfm;
841}
842EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
843
844int crypto_register_notifier(struct notifier_block *nb)
845{
846 return blocking_notifier_chain_register(&crypto_chain, nb);
847}
848EXPORT_SYMBOL_GPL(crypto_register_notifier);
849
850int crypto_unregister_notifier(struct notifier_block *nb)
851{
852 return blocking_notifier_chain_unregister(&crypto_chain, nb);
853}
854EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
855
856struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
857{
858 struct rtattr *rta = tb[0];
859 struct crypto_attr_type *algt;
860
861 if (!rta)
862 return ERR_PTR(-ENOENT);
863 if (RTA_PAYLOAD(rta) < sizeof(*algt))
864 return ERR_PTR(-EINVAL);
865 if (rta->rta_type != CRYPTOA_TYPE)
866 return ERR_PTR(-EINVAL);
867
868 algt = RTA_DATA(rta);
869
870 return algt;
871}
872EXPORT_SYMBOL_GPL(crypto_get_attr_type);
873
874/**
875 * crypto_check_attr_type() - check algorithm type and compute inherited mask
876 * @tb: the template parameters
877 * @type: the algorithm type the template would be instantiated as
878 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
879 * to restrict the flags of any inner algorithms
880 *
881 * Validate that the algorithm type the user requested is compatible with the
882 * one the template would actually be instantiated as. E.g., if the user is
883 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
884 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
885 *
886 * Also compute the mask to use to restrict the flags of any inner algorithms.
887 *
888 * Return: 0 on success; -errno on failure
889 */
890int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
891{
892 struct crypto_attr_type *algt;
893
894 algt = crypto_get_attr_type(tb);
895 if (IS_ERR(algt))
896 return PTR_ERR(algt);
897
898 if ((algt->type ^ type) & algt->mask)
899 return -EINVAL;
900
901 *mask_ret = crypto_algt_inherited_mask(algt);
902 return 0;
903}
904EXPORT_SYMBOL_GPL(crypto_check_attr_type);
905
906const char *crypto_attr_alg_name(struct rtattr *rta)
907{
908 struct crypto_attr_alg *alga;
909
910 if (!rta)
911 return ERR_PTR(-ENOENT);
912 if (RTA_PAYLOAD(rta) < sizeof(*alga))
913 return ERR_PTR(-EINVAL);
914 if (rta->rta_type != CRYPTOA_ALG)
915 return ERR_PTR(-EINVAL);
916
917 alga = RTA_DATA(rta);
918 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
919
920 return alga->name;
921}
922EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
923
924int __crypto_inst_setname(struct crypto_instance *inst, const char *name,
925 const char *driver, struct crypto_alg *alg)
926{
927 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
928 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
929 return -ENAMETOOLONG;
930
931 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
932 driver, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
933 return -ENAMETOOLONG;
934
935 return 0;
936}
937EXPORT_SYMBOL_GPL(__crypto_inst_setname);
938
939void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
940{
941 INIT_LIST_HEAD(&queue->list);
942 queue->backlog = &queue->list;
943 queue->qlen = 0;
944 queue->max_qlen = max_qlen;
945}
946EXPORT_SYMBOL_GPL(crypto_init_queue);
947
948int crypto_enqueue_request(struct crypto_queue *queue,
949 struct crypto_async_request *request)
950{
951 int err = -EINPROGRESS;
952
953 if (unlikely(queue->qlen >= queue->max_qlen)) {
954 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
955 err = -ENOSPC;
956 goto out;
957 }
958 err = -EBUSY;
959 if (queue->backlog == &queue->list)
960 queue->backlog = &request->list;
961 }
962
963 queue->qlen++;
964 list_add_tail(&request->list, &queue->list);
965
966out:
967 return err;
968}
969EXPORT_SYMBOL_GPL(crypto_enqueue_request);
970
971void crypto_enqueue_request_head(struct crypto_queue *queue,
972 struct crypto_async_request *request)
973{
974 if (unlikely(queue->qlen >= queue->max_qlen))
975 queue->backlog = queue->backlog->prev;
976
977 queue->qlen++;
978 list_add(&request->list, &queue->list);
979}
980EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
981
982struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
983{
984 struct list_head *request;
985
986 if (unlikely(!queue->qlen))
987 return NULL;
988
989 queue->qlen--;
990
991 if (queue->backlog != &queue->list)
992 queue->backlog = queue->backlog->next;
993
994 request = queue->list.next;
995 list_del_init(request);
996
997 return list_entry(request, struct crypto_async_request, list);
998}
999EXPORT_SYMBOL_GPL(crypto_dequeue_request);
1000
1001static inline void crypto_inc_byte(u8 *a, unsigned int size)
1002{
1003 u8 *b = (a + size);
1004 u8 c;
1005
1006 for (; size; size--) {
1007 c = *--b + 1;
1008 *b = c;
1009 if (c)
1010 break;
1011 }
1012}
1013
1014void crypto_inc(u8 *a, unsigned int size)
1015{
1016 __be32 *b = (__be32 *)(a + size);
1017 u32 c;
1018
1019 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1020 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1021 for (; size >= 4; size -= 4) {
1022 c = be32_to_cpu(*--b) + 1;
1023 *b = cpu_to_be32(c);
1024 if (likely(c))
1025 return;
1026 }
1027
1028 crypto_inc_byte(a, size);
1029}
1030EXPORT_SYMBOL_GPL(crypto_inc);
1031
1032unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1033{
1034 return alg->cra_ctxsize +
1035 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1036}
1037EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1038
1039int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1040 u32 type, u32 mask)
1041{
1042 int ret = 0;
1043 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1044
1045 if (!IS_ERR(alg)) {
1046 crypto_mod_put(alg);
1047 ret = 1;
1048 }
1049
1050 return ret;
1051}
1052EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1053
1054static void __init crypto_start_tests(void)
1055{
1056 if (!IS_BUILTIN(CONFIG_CRYPTO_ALGAPI))
1057 return;
1058
1059 if (!IS_ENABLED(CONFIG_CRYPTO_SELFTESTS))
1060 return;
1061
1062 set_crypto_boot_test_finished();
1063
1064 for (;;) {
1065 struct crypto_larval *larval = NULL;
1066 struct crypto_alg *q;
1067
1068 down_write(&crypto_alg_sem);
1069
1070 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1071 struct crypto_larval *l;
1072
1073 if (!crypto_is_larval(q))
1074 continue;
1075
1076 l = (void *)q;
1077
1078 if (!crypto_is_test_larval(l))
1079 continue;
1080
1081 if (l->test_started)
1082 continue;
1083
1084 l->test_started = true;
1085 larval = l;
1086 break;
1087 }
1088
1089 up_write(&crypto_alg_sem);
1090
1091 if (!larval)
1092 break;
1093
1094 crypto_schedule_test(larval);
1095 }
1096}
1097
1098static int __init crypto_algapi_init(void)
1099{
1100 crypto_init_proc();
1101 crypto_start_tests();
1102 return 0;
1103}
1104
1105static 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 */
1114late_initcall(crypto_algapi_init);
1115module_exit(crypto_algapi_exit);
1116
1117MODULE_LICENSE("GPL");
1118MODULE_DESCRIPTION("Cryptographic algorithms API");
1119MODULE_SOFTDEP("pre: cryptomgr");