Merge tag 'for-6.6-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[platform/kernel/linux-starfive.git] / crypto / algapi.c
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(mod))
34                 panic("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(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(&alg->cra_refcnt, 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(&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(&spawn->list, secondary_spawns);
120
121         if (list_is_last(&n->list, 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(&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(&inst->alg.cra_list, list);
145         hlist_del(&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(&spawn->list, &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(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(&spawn->list, &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, &top,
221                                               &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(&spawn->list, &spawn->alg->cra_users);
231                 else if (spawn->registered)
232                         crypto_remove_instance(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(q))
248                         continue;
249
250                 if (crypto_is_larval(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(-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(CRYPTO_MSG_ALG_LOADED, 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(alg->cra_name,
298                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
299         if (IS_ERR(larval))
300                 return larval;
301
302         larval->adult = crypto_mod_get(alg);
303         if (!larval->adult) {
304                 kfree(larval);
305                 return ERR_PTR(-ENOENT);
306         }
307
308         refcount_set(&larval->alg.cra_refcnt, 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(&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(q))
335                         continue;
336
337                 if (crypto_is_larval(q)) {
338                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
339                                 goto err;
340                         continue;
341                 }
342
343                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
344                     !strcmp(q->cra_name, alg->cra_driver_name))
345                         goto err;
346         }
347
348         larval = crypto_alloc_test_larval(alg);
349         if (IS_ERR(larval))
350                 goto out;
351
352         list_add(&alg->cra_list, &crypto_alg_list);
353
354         if (larval) {
355                 /* No cheating! */
356                 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
357
358                 list_add(&larval->alg.cra_list, &crypto_alg_list);
359         } else {
360                 alg->cra_flags |= CRYPTO_ALG_TESTED;
361                 crypto_alg_finish_registration(alg, true, algs_to_put);
362         }
363
364 out:
365         return larval;
366
367 err:
368         larval = ERR_PTR(ret);
369         goto out;
370 }
371
372 void crypto_alg_tested(const char *name, int err)
373 {
374         struct crypto_larval *test;
375         struct crypto_alg *alg;
376         struct crypto_alg *q;
377         LIST_HEAD(list);
378         bool best;
379
380         down_write(&crypto_alg_sem);
381         list_for_each_entry(q, &crypto_alg_list, cra_list) {
382                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
383                         continue;
384
385                 test = (struct crypto_larval *)q;
386
387                 if (!strcmp(q->cra_driver_name, name))
388                         goto found;
389         }
390
391         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
392         goto unlock;
393
394 found:
395         q->cra_flags |= CRYPTO_ALG_DEAD;
396         alg = test->adult;
397
398         if (list_empty(&alg->cra_list))
399                 goto complete;
400
401         if (err == -ECANCELED)
402                 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
403         else if (err)
404                 goto complete;
405         else
406                 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
407
408         alg->cra_flags |= CRYPTO_ALG_TESTED;
409
410         /*
411          * If a higher-priority implementation of the same algorithm is
412          * currently being tested, then don't fulfill request larvals.
413          */
414         best = true;
415         list_for_each_entry(q, &crypto_alg_list, cra_list) {
416                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
417                         continue;
418
419                 if (strcmp(alg->cra_name, q->cra_name))
420                         continue;
421
422                 if (q->cra_priority > alg->cra_priority) {
423                         best = false;
424                         break;
425                 }
426         }
427
428         crypto_alg_finish_registration(alg, best, &list);
429
430 complete:
431         complete_all(&test->completion);
432
433 unlock:
434         up_write(&crypto_alg_sem);
435
436         crypto_remove_final(&list);
437 }
438 EXPORT_SYMBOL_GPL(crypto_alg_tested);
439
440 void crypto_remove_final(struct list_head *list)
441 {
442         struct crypto_alg *alg;
443         struct crypto_alg *n;
444
445         list_for_each_entry_safe(alg, n, list, cra_list) {
446                 list_del_init(&alg->cra_list);
447                 crypto_alg_put(alg);
448         }
449 }
450 EXPORT_SYMBOL_GPL(crypto_remove_final);
451
452 int crypto_register_alg(struct crypto_alg *alg)
453 {
454         struct crypto_larval *larval;
455         LIST_HEAD(algs_to_put);
456         bool test_started = false;
457         int err;
458
459         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
460         err = crypto_check_alg(alg);
461         if (err)
462                 return err;
463
464         down_write(&crypto_alg_sem);
465         larval = __crypto_register_alg(alg, &algs_to_put);
466         if (!IS_ERR_OR_NULL(larval)) {
467                 test_started = crypto_boot_test_finished();
468                 larval->test_started = test_started;
469         }
470         up_write(&crypto_alg_sem);
471
472         if (IS_ERR(larval))
473                 return PTR_ERR(larval);
474         if (test_started)
475                 crypto_wait_for_test(larval);
476         crypto_remove_final(&algs_to_put);
477         return 0;
478 }
479 EXPORT_SYMBOL_GPL(crypto_register_alg);
480
481 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
482 {
483         if (unlikely(list_empty(&alg->cra_list)))
484                 return -ENOENT;
485
486         alg->cra_flags |= CRYPTO_ALG_DEAD;
487
488         list_del_init(&alg->cra_list);
489         crypto_remove_spawns(alg, list, NULL);
490
491         return 0;
492 }
493
494 void crypto_unregister_alg(struct crypto_alg *alg)
495 {
496         int ret;
497         LIST_HEAD(list);
498
499         down_write(&crypto_alg_sem);
500         ret = crypto_remove_alg(alg, &list);
501         up_write(&crypto_alg_sem);
502
503         if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
504                 return;
505
506         if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
507                 return;
508
509         if (alg->cra_destroy)
510                 alg->cra_destroy(alg);
511
512         crypto_remove_final(&list);
513 }
514 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
515
516 int crypto_register_algs(struct crypto_alg *algs, int count)
517 {
518         int i, ret;
519
520         for (i = 0; i < count; i++) {
521                 ret = crypto_register_alg(&algs[i]);
522                 if (ret)
523                         goto err;
524         }
525
526         return 0;
527
528 err:
529         for (--i; i >= 0; --i)
530                 crypto_unregister_alg(&algs[i]);
531
532         return ret;
533 }
534 EXPORT_SYMBOL_GPL(crypto_register_algs);
535
536 void crypto_unregister_algs(struct crypto_alg *algs, int count)
537 {
538         int i;
539
540         for (i = 0; i < count; i++)
541                 crypto_unregister_alg(&algs[i]);
542 }
543 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
544
545 int crypto_register_template(struct crypto_template *tmpl)
546 {
547         struct crypto_template *q;
548         int err = -EEXIST;
549
550         down_write(&crypto_alg_sem);
551
552         crypto_check_module_sig(tmpl->module);
553
554         list_for_each_entry(q, &crypto_template_list, list) {
555                 if (q == tmpl)
556                         goto out;
557         }
558
559         list_add(&tmpl->list, &crypto_template_list);
560         err = 0;
561 out:
562         up_write(&crypto_alg_sem);
563         return err;
564 }
565 EXPORT_SYMBOL_GPL(crypto_register_template);
566
567 int crypto_register_templates(struct crypto_template *tmpls, int count)
568 {
569         int i, err;
570
571         for (i = 0; i < count; i++) {
572                 err = crypto_register_template(&tmpls[i]);
573                 if (err)
574                         goto out;
575         }
576         return 0;
577
578 out:
579         for (--i; i >= 0; --i)
580                 crypto_unregister_template(&tmpls[i]);
581         return err;
582 }
583 EXPORT_SYMBOL_GPL(crypto_register_templates);
584
585 void crypto_unregister_template(struct crypto_template *tmpl)
586 {
587         struct crypto_instance *inst;
588         struct hlist_node *n;
589         struct hlist_head *list;
590         LIST_HEAD(users);
591
592         down_write(&crypto_alg_sem);
593
594         BUG_ON(list_empty(&tmpl->list));
595         list_del_init(&tmpl->list);
596
597         list = &tmpl->instances;
598         hlist_for_each_entry(inst, list, list) {
599                 int err = crypto_remove_alg(&inst->alg, &users);
600
601                 BUG_ON(err);
602         }
603
604         up_write(&crypto_alg_sem);
605
606         hlist_for_each_entry_safe(inst, n, list, list) {
607                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
608                 crypto_free_instance(inst);
609         }
610         crypto_remove_final(&users);
611 }
612 EXPORT_SYMBOL_GPL(crypto_unregister_template);
613
614 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
615 {
616         int i;
617
618         for (i = count - 1; i >= 0; --i)
619                 crypto_unregister_template(&tmpls[i]);
620 }
621 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
622
623 static struct crypto_template *__crypto_lookup_template(const char *name)
624 {
625         struct crypto_template *q, *tmpl = NULL;
626
627         down_read(&crypto_alg_sem);
628         list_for_each_entry(q, &crypto_template_list, list) {
629                 if (strcmp(q->name, name))
630                         continue;
631                 if (unlikely(!crypto_tmpl_get(q)))
632                         continue;
633
634                 tmpl = q;
635                 break;
636         }
637         up_read(&crypto_alg_sem);
638
639         return tmpl;
640 }
641
642 struct crypto_template *crypto_lookup_template(const char *name)
643 {
644         return try_then_request_module(__crypto_lookup_template(name),
645                                        "crypto-%s", name);
646 }
647 EXPORT_SYMBOL_GPL(crypto_lookup_template);
648
649 int crypto_register_instance(struct crypto_template *tmpl,
650                              struct crypto_instance *inst)
651 {
652         struct crypto_larval *larval;
653         struct crypto_spawn *spawn;
654         u32 fips_internal = 0;
655         LIST_HEAD(algs_to_put);
656         int err;
657
658         err = crypto_check_alg(&inst->alg);
659         if (err)
660                 return err;
661
662         inst->alg.cra_module = tmpl->module;
663         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
664
665         down_write(&crypto_alg_sem);
666
667         larval = ERR_PTR(-EAGAIN);
668         for (spawn = inst->spawns; spawn;) {
669                 struct crypto_spawn *next;
670
671                 if (spawn->dead)
672                         goto unlock;
673
674                 next = spawn->next;
675                 spawn->inst = inst;
676                 spawn->registered = true;
677
678                 fips_internal |= spawn->alg->cra_flags;
679
680                 crypto_mod_put(spawn->alg);
681
682                 spawn = next;
683         }
684
685         inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
686
687         larval = __crypto_register_alg(&inst->alg, &algs_to_put);
688         if (IS_ERR(larval))
689                 goto unlock;
690         else if (larval)
691                 larval->test_started = true;
692
693         hlist_add_head(&inst->list, &tmpl->instances);
694         inst->tmpl = tmpl;
695
696 unlock:
697         up_write(&crypto_alg_sem);
698
699         if (IS_ERR(larval))
700                 return PTR_ERR(larval);
701         if (larval)
702                 crypto_wait_for_test(larval);
703         crypto_remove_final(&algs_to_put);
704         return 0;
705 }
706 EXPORT_SYMBOL_GPL(crypto_register_instance);
707
708 void crypto_unregister_instance(struct crypto_instance *inst)
709 {
710         LIST_HEAD(list);
711
712         down_write(&crypto_alg_sem);
713
714         crypto_remove_spawns(&inst->alg, &list, NULL);
715         crypto_remove_instance(inst, &list);
716
717         up_write(&crypto_alg_sem);
718
719         crypto_remove_final(&list);
720 }
721 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
722
723 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
724                       const char *name, u32 type, u32 mask)
725 {
726         struct crypto_alg *alg;
727         int err = -EAGAIN;
728
729         if (WARN_ON_ONCE(inst == NULL))
730                 return -EINVAL;
731
732         /* Allow the result of crypto_attr_alg_name() to be passed directly */
733         if (IS_ERR(name))
734                 return PTR_ERR(name);
735
736         alg = crypto_find_alg(name, spawn->frontend,
737                               type | CRYPTO_ALG_FIPS_INTERNAL, mask);
738         if (IS_ERR(alg))
739                 return PTR_ERR(alg);
740
741         down_write(&crypto_alg_sem);
742         if (!crypto_is_moribund(alg)) {
743                 list_add(&spawn->list, &alg->cra_users);
744                 spawn->alg = alg;
745                 spawn->mask = mask;
746                 spawn->next = inst->spawns;
747                 inst->spawns = spawn;
748                 inst->alg.cra_flags |=
749                         (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
750                 err = 0;
751         }
752         up_write(&crypto_alg_sem);
753         if (err)
754                 crypto_mod_put(alg);
755         return err;
756 }
757 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
758
759 void crypto_drop_spawn(struct crypto_spawn *spawn)
760 {
761         if (!spawn->alg) /* not yet initialized? */
762                 return;
763
764         down_write(&crypto_alg_sem);
765         if (!spawn->dead)
766                 list_del(&spawn->list);
767         up_write(&crypto_alg_sem);
768
769         if (!spawn->registered)
770                 crypto_mod_put(spawn->alg);
771 }
772 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
773
774 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
775 {
776         struct crypto_alg *alg = ERR_PTR(-EAGAIN);
777         struct crypto_alg *target;
778         bool shoot = false;
779
780         down_read(&crypto_alg_sem);
781         if (!spawn->dead) {
782                 alg = spawn->alg;
783                 if (!crypto_mod_get(alg)) {
784                         target = crypto_alg_get(alg);
785                         shoot = true;
786                         alg = ERR_PTR(-EAGAIN);
787                 }
788         }
789         up_read(&crypto_alg_sem);
790
791         if (shoot) {
792                 crypto_shoot_alg(target);
793                 crypto_alg_put(target);
794         }
795
796         return alg;
797 }
798
799 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
800                                     u32 mask)
801 {
802         struct crypto_alg *alg;
803         struct crypto_tfm *tfm;
804
805         alg = crypto_spawn_alg(spawn);
806         if (IS_ERR(alg))
807                 return ERR_CAST(alg);
808
809         tfm = ERR_PTR(-EINVAL);
810         if (unlikely((alg->cra_flags ^ type) & mask))
811                 goto out_put_alg;
812
813         tfm = __crypto_alloc_tfm(alg, type, mask);
814         if (IS_ERR(tfm))
815                 goto out_put_alg;
816
817         return tfm;
818
819 out_put_alg:
820         crypto_mod_put(alg);
821         return tfm;
822 }
823 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
824
825 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
826 {
827         struct crypto_alg *alg;
828         struct crypto_tfm *tfm;
829
830         alg = crypto_spawn_alg(spawn);
831         if (IS_ERR(alg))
832                 return ERR_CAST(alg);
833
834         tfm = crypto_create_tfm(alg, spawn->frontend);
835         if (IS_ERR(tfm))
836                 goto out_put_alg;
837
838         return tfm;
839
840 out_put_alg:
841         crypto_mod_put(alg);
842         return tfm;
843 }
844 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
845
846 int crypto_register_notifier(struct notifier_block *nb)
847 {
848         return blocking_notifier_chain_register(&crypto_chain, nb);
849 }
850 EXPORT_SYMBOL_GPL(crypto_register_notifier);
851
852 int crypto_unregister_notifier(struct notifier_block *nb)
853 {
854         return blocking_notifier_chain_unregister(&crypto_chain, nb);
855 }
856 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
857
858 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
859 {
860         struct rtattr *rta = tb[0];
861         struct crypto_attr_type *algt;
862
863         if (!rta)
864                 return ERR_PTR(-ENOENT);
865         if (RTA_PAYLOAD(rta) < sizeof(*algt))
866                 return ERR_PTR(-EINVAL);
867         if (rta->rta_type != CRYPTOA_TYPE)
868                 return ERR_PTR(-EINVAL);
869
870         algt = RTA_DATA(rta);
871
872         return algt;
873 }
874 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
875
876 /**
877  * crypto_check_attr_type() - check algorithm type and compute inherited mask
878  * @tb: the template parameters
879  * @type: the algorithm type the template would be instantiated as
880  * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
881  *            to restrict the flags of any inner algorithms
882  *
883  * Validate that the algorithm type the user requested is compatible with the
884  * one the template would actually be instantiated as.  E.g., if the user is
885  * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
886  * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
887  *
888  * Also compute the mask to use to restrict the flags of any inner algorithms.
889  *
890  * Return: 0 on success; -errno on failure
891  */
892 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
893 {
894         struct crypto_attr_type *algt;
895
896         algt = crypto_get_attr_type(tb);
897         if (IS_ERR(algt))
898                 return PTR_ERR(algt);
899
900         if ((algt->type ^ type) & algt->mask)
901                 return -EINVAL;
902
903         *mask_ret = crypto_algt_inherited_mask(algt);
904         return 0;
905 }
906 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
907
908 const char *crypto_attr_alg_name(struct rtattr *rta)
909 {
910         struct crypto_attr_alg *alga;
911
912         if (!rta)
913                 return ERR_PTR(-ENOENT);
914         if (RTA_PAYLOAD(rta) < sizeof(*alga))
915                 return ERR_PTR(-EINVAL);
916         if (rta->rta_type != CRYPTOA_ALG)
917                 return ERR_PTR(-EINVAL);
918
919         alga = RTA_DATA(rta);
920         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
921
922         return alga->name;
923 }
924 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
925
926 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
927                         struct crypto_alg *alg)
928 {
929         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
930                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
931                 return -ENAMETOOLONG;
932
933         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
934                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
935                 return -ENAMETOOLONG;
936
937         return 0;
938 }
939 EXPORT_SYMBOL_GPL(crypto_inst_setname);
940
941 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
942 {
943         INIT_LIST_HEAD(&queue->list);
944         queue->backlog = &queue->list;
945         queue->qlen = 0;
946         queue->max_qlen = max_qlen;
947 }
948 EXPORT_SYMBOL_GPL(crypto_init_queue);
949
950 int crypto_enqueue_request(struct crypto_queue *queue,
951                            struct crypto_async_request *request)
952 {
953         int err = -EINPROGRESS;
954
955         if (unlikely(queue->qlen >= queue->max_qlen)) {
956                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
957                         err = -ENOSPC;
958                         goto out;
959                 }
960                 err = -EBUSY;
961                 if (queue->backlog == &queue->list)
962                         queue->backlog = &request->list;
963         }
964
965         queue->qlen++;
966         list_add_tail(&request->list, &queue->list);
967
968 out:
969         return err;
970 }
971 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
972
973 void crypto_enqueue_request_head(struct crypto_queue *queue,
974                                  struct crypto_async_request *request)
975 {
976         if (unlikely(queue->qlen >= queue->max_qlen))
977                 queue->backlog = queue->backlog->prev;
978
979         queue->qlen++;
980         list_add(&request->list, &queue->list);
981 }
982 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
983
984 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
985 {
986         struct list_head *request;
987
988         if (unlikely(!queue->qlen))
989                 return NULL;
990
991         queue->qlen--;
992
993         if (queue->backlog != &queue->list)
994                 queue->backlog = queue->backlog->next;
995
996         request = queue->list.next;
997         list_del(request);
998
999         return list_entry(request, struct crypto_async_request, list);
1000 }
1001 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
1002
1003 static inline void crypto_inc_byte(u8 *a, unsigned int size)
1004 {
1005         u8 *b = (a + size);
1006         u8 c;
1007
1008         for (; size; size--) {
1009                 c = *--b + 1;
1010                 *b = c;
1011                 if (c)
1012                         break;
1013         }
1014 }
1015
1016 void crypto_inc(u8 *a, unsigned int size)
1017 {
1018         __be32 *b = (__be32 *)(a + size);
1019         u32 c;
1020
1021         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1022             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1023                 for (; size >= 4; size -= 4) {
1024                         c = be32_to_cpu(*--b) + 1;
1025                         *b = cpu_to_be32(c);
1026                         if (likely(c))
1027                                 return;
1028                 }
1029
1030         crypto_inc_byte(a, size);
1031 }
1032 EXPORT_SYMBOL_GPL(crypto_inc);
1033
1034 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1035 {
1036         return alg->cra_ctxsize +
1037                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1038 }
1039 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1040
1041 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1042                         u32 type, u32 mask)
1043 {
1044         int ret = 0;
1045         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1046
1047         if (!IS_ERR(alg)) {
1048                 crypto_mod_put(alg);
1049                 ret = 1;
1050         }
1051
1052         return ret;
1053 }
1054 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1055
1056 static void __init crypto_start_tests(void)
1057 {
1058         if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1059                 return;
1060
1061         for (;;) {
1062                 struct crypto_larval *larval = NULL;
1063                 struct crypto_alg *q;
1064
1065                 down_write(&crypto_alg_sem);
1066
1067                 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1068                         struct crypto_larval *l;
1069
1070                         if (!crypto_is_larval(q))
1071                                 continue;
1072
1073                         l = (void *)q;
1074
1075                         if (!crypto_is_test_larval(l))
1076                                 continue;
1077
1078                         if (l->test_started)
1079                                 continue;
1080
1081                         l->test_started = true;
1082                         larval = l;
1083                         break;
1084                 }
1085
1086                 up_write(&crypto_alg_sem);
1087
1088                 if (!larval)
1089                         break;
1090
1091                 crypto_wait_for_test(larval);
1092         }
1093
1094         set_crypto_boot_test_finished();
1095 }
1096
1097 static int __init crypto_algapi_init(void)
1098 {
1099         crypto_init_proc();
1100         crypto_start_tests();
1101         return 0;
1102 }
1103
1104 static void __exit crypto_algapi_exit(void)
1105 {
1106         crypto_exit_proc();
1107 }
1108
1109 /*
1110  * We run this at late_initcall so that all the built-in algorithms
1111  * have had a chance to register themselves first.
1112  */
1113 late_initcall(crypto_algapi_init);
1114 module_exit(crypto_algapi_exit);
1115
1116 MODULE_LICENSE("GPL");
1117 MODULE_DESCRIPTION("Cryptographic algorithms API");
1118 MODULE_SOFTDEP("pre: cryptomgr");