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
24static LIST_HEAD(crypto_template_list);
25
26#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
27DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
28EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
29#endif
30
31static 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
38static 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
73static void crypto_free_instance(struct crypto_instance *inst)
74{
75 inst->alg.cra_type->free(inst);
76}
77
78static 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
88static 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 */
107static 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
131static 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 */
157void 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 = &top;
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}
235EXPORT_SYMBOL_GPL(crypto_remove_spawns);
236
237static 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
288static 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
316static 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
365out:
366 return larval;
367
368err:
369 larval = ERR_PTR(error: ret);
370 goto out;
371}
372
373void 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
395found:
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
431complete:
432 complete_all(&test->completion);
433
434unlock:
435 up_write(sem: &crypto_alg_sem);
436
437 crypto_remove_final(list: &list);
438}
439EXPORT_SYMBOL_GPL(crypto_alg_tested);
440
441void 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}
451EXPORT_SYMBOL_GPL(crypto_remove_final);
452
453int 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}
480EXPORT_SYMBOL_GPL(crypto_register_alg);
481
482static 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
495void 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}
515EXPORT_SYMBOL_GPL(crypto_unregister_alg);
516
517int 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
529err:
530 for (--i; i >= 0; --i)
531 crypto_unregister_alg(&algs[i]);
532
533 return ret;
534}
535EXPORT_SYMBOL_GPL(crypto_register_algs);
536
537void 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}
544EXPORT_SYMBOL_GPL(crypto_unregister_algs);
545
546int 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;
562out:
563 up_write(sem: &crypto_alg_sem);
564 return err;
565}
566EXPORT_SYMBOL_GPL(crypto_register_template);
567
568int 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
579out:
580 for (--i; i >= 0; --i)
581 crypto_unregister_template(tmpl: &tmpls[i]);
582 return err;
583}
584EXPORT_SYMBOL_GPL(crypto_register_templates);
585
586void 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}
613EXPORT_SYMBOL_GPL(crypto_unregister_template);
614
615void 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}
622EXPORT_SYMBOL_GPL(crypto_unregister_templates);
623
624static 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
643struct crypto_template *crypto_lookup_template(const char *name)
644{
645 return try_then_request_module(__crypto_lookup_template(name),
646 "crypto-%s", name);
647}
648EXPORT_SYMBOL_GPL(crypto_lookup_template);
649
650int 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
697unlock:
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}
707EXPORT_SYMBOL_GPL(crypto_register_instance);
708
709void 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}
722EXPORT_SYMBOL_GPL(crypto_unregister_instance);
723
724int 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}
758EXPORT_SYMBOL_GPL(crypto_grab_spawn);
759
760void 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}
773EXPORT_SYMBOL_GPL(crypto_drop_spawn);
774
775static 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
800struct 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
820out_put_alg:
821 crypto_mod_put(alg);
822 return tfm;
823}
824EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
825
826void *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
841out_put_alg:
842 crypto_mod_put(alg);
843 return tfm;
844}
845EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
846
847int crypto_register_notifier(struct notifier_block *nb)
848{
849 return blocking_notifier_chain_register(nh: &crypto_chain, nb);
850}
851EXPORT_SYMBOL_GPL(crypto_register_notifier);
852
853int crypto_unregister_notifier(struct notifier_block *nb)
854{
855 return blocking_notifier_chain_unregister(nh: &crypto_chain, nb);
856}
857EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
858
859struct 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}
875EXPORT_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 */
893int 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}
907EXPORT_SYMBOL_GPL(crypto_check_attr_type);
908
909const 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}
925EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
926
927int 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}
940EXPORT_SYMBOL_GPL(crypto_inst_setname);
941
942void 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}
949EXPORT_SYMBOL_GPL(crypto_init_queue);
950
951int 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
969out:
970 return err;
971}
972EXPORT_SYMBOL_GPL(crypto_enqueue_request);
973
974void 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}
983EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
984
985struct 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}
1002EXPORT_SYMBOL_GPL(crypto_dequeue_request);
1003
1004static 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
1017void 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}
1033EXPORT_SYMBOL_GPL(crypto_inc);
1034
1035unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1036{
1037 return alg->cra_ctxsize +
1038 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1039}
1040EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1041
1042int 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}
1055EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1056
1057static 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
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");
1120

source code of linux/crypto/algapi.c