netfilter: nft_set_pipapo: remove scratch_aligned pointer
[platform/kernel/linux-rpi.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_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(larval))
351                 goto out;
352
353         list_add(&alg->cra_list, &crypto_alg_list);
354
355         if (larval) {
356                 /* No cheating! */
357                 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
358
359                 list_add(&larval->alg.cra_list, &crypto_alg_list);
360         } else {
361                 alg->cra_flags |= CRYPTO_ALG_TESTED;
362                 crypto_alg_finish_registration(alg, true, algs_to_put);
363         }
364
365 out:
366         return larval;
367
368 err:
369         larval = ERR_PTR(ret);
370         goto out;
371 }
372
373 void crypto_alg_tested(const char *name, int err)
374 {
375         struct crypto_larval *test;
376         struct crypto_alg *alg;
377         struct crypto_alg *q;
378         LIST_HEAD(list);
379         bool best;
380
381         down_write(&crypto_alg_sem);
382         list_for_each_entry(q, &crypto_alg_list, cra_list) {
383                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
384                         continue;
385
386                 test = (struct crypto_larval *)q;
387
388                 if (!strcmp(q->cra_driver_name, name))
389                         goto found;
390         }
391
392         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
393         goto unlock;
394
395 found:
396         q->cra_flags |= CRYPTO_ALG_DEAD;
397         alg = test->adult;
398
399         if (list_empty(&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(q) || !crypto_is_larval(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, best, &list);
430
431 complete:
432         complete_all(&test->completion);
433
434 unlock:
435         up_write(&crypto_alg_sem);
436
437         crypto_remove_final(&list);
438 }
439 EXPORT_SYMBOL_GPL(crypto_alg_tested);
440
441 void crypto_remove_final(struct list_head *list)
442 {
443         struct crypto_alg *alg;
444         struct crypto_alg *n;
445
446         list_for_each_entry_safe(alg, n, list, cra_list) {
447                 list_del_init(&alg->cra_list);
448                 crypto_alg_put(alg);
449         }
450 }
451 EXPORT_SYMBOL_GPL(crypto_remove_final);
452
453 int crypto_register_alg(struct crypto_alg *alg)
454 {
455         struct crypto_larval *larval;
456         LIST_HEAD(algs_to_put);
457         bool test_started = false;
458         int err;
459
460         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
461         err = crypto_check_alg(alg);
462         if (err)
463                 return err;
464
465         down_write(&crypto_alg_sem);
466         larval = __crypto_register_alg(alg, &algs_to_put);
467         if (!IS_ERR_OR_NULL(larval)) {
468                 test_started = crypto_boot_test_finished();
469                 larval->test_started = test_started;
470         }
471         up_write(&crypto_alg_sem);
472
473         if (IS_ERR(larval))
474                 return PTR_ERR(larval);
475         if (test_started)
476                 crypto_wait_for_test(larval);
477         crypto_remove_final(&algs_to_put);
478         return 0;
479 }
480 EXPORT_SYMBOL_GPL(crypto_register_alg);
481
482 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
483 {
484         if (unlikely(list_empty(&alg->cra_list)))
485                 return -ENOENT;
486
487         alg->cra_flags |= CRYPTO_ALG_DEAD;
488
489         list_del_init(&alg->cra_list);
490         crypto_remove_spawns(alg, list, NULL);
491
492         return 0;
493 }
494
495 void crypto_unregister_alg(struct crypto_alg *alg)
496 {
497         int ret;
498         LIST_HEAD(list);
499
500         down_write(&crypto_alg_sem);
501         ret = crypto_remove_alg(alg, &list);
502         up_write(&crypto_alg_sem);
503
504         if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
505                 return;
506
507         if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
508                 return;
509
510         if (alg->cra_destroy)
511                 alg->cra_destroy(alg);
512
513         crypto_remove_final(&list);
514 }
515 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
516
517 int crypto_register_algs(struct crypto_alg *algs, int count)
518 {
519         int i, ret;
520
521         for (i = 0; i < count; i++) {
522                 ret = crypto_register_alg(&algs[i]);
523                 if (ret)
524                         goto err;
525         }
526
527         return 0;
528
529 err:
530         for (--i; i >= 0; --i)
531                 crypto_unregister_alg(&algs[i]);
532
533         return ret;
534 }
535 EXPORT_SYMBOL_GPL(crypto_register_algs);
536
537 void crypto_unregister_algs(struct crypto_alg *algs, int count)
538 {
539         int i;
540
541         for (i = 0; i < count; i++)
542                 crypto_unregister_alg(&algs[i]);
543 }
544 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
545
546 int crypto_register_template(struct crypto_template *tmpl)
547 {
548         struct crypto_template *q;
549         int err = -EEXIST;
550
551         down_write(&crypto_alg_sem);
552
553         crypto_check_module_sig(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(&tmpl->list, &crypto_template_list);
561         err = 0;
562 out:
563         up_write(&crypto_alg_sem);
564         return err;
565 }
566 EXPORT_SYMBOL_GPL(crypto_register_template);
567
568 int crypto_register_templates(struct crypto_template *tmpls, int count)
569 {
570         int i, err;
571
572         for (i = 0; i < count; i++) {
573                 err = crypto_register_template(&tmpls[i]);
574                 if (err)
575                         goto out;
576         }
577         return 0;
578
579 out:
580         for (--i; i >= 0; --i)
581                 crypto_unregister_template(&tmpls[i]);
582         return err;
583 }
584 EXPORT_SYMBOL_GPL(crypto_register_templates);
585
586 void crypto_unregister_template(struct crypto_template *tmpl)
587 {
588         struct crypto_instance *inst;
589         struct hlist_node *n;
590         struct hlist_head *list;
591         LIST_HEAD(users);
592
593         down_write(&crypto_alg_sem);
594
595         BUG_ON(list_empty(&tmpl->list));
596         list_del_init(&tmpl->list);
597
598         list = &tmpl->instances;
599         hlist_for_each_entry(inst, list, list) {
600                 int err = crypto_remove_alg(&inst->alg, &users);
601
602                 BUG_ON(err);
603         }
604
605         up_write(&crypto_alg_sem);
606
607         hlist_for_each_entry_safe(inst, n, list, list) {
608                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
609                 crypto_free_instance(inst);
610         }
611         crypto_remove_final(&users);
612 }
613 EXPORT_SYMBOL_GPL(crypto_unregister_template);
614
615 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
616 {
617         int i;
618
619         for (i = count - 1; i >= 0; --i)
620                 crypto_unregister_template(&tmpls[i]);
621 }
622 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
623
624 static struct crypto_template *__crypto_lookup_template(const char *name)
625 {
626         struct crypto_template *q, *tmpl = NULL;
627
628         down_read(&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(&crypto_alg_sem);
639
640         return tmpl;
641 }
642
643 struct crypto_template *crypto_lookup_template(const char *name)
644 {
645         return try_then_request_module(__crypto_lookup_template(name),
646                                        "crypto-%s", name);
647 }
648 EXPORT_SYMBOL_GPL(crypto_lookup_template);
649
650 int crypto_register_instance(struct crypto_template *tmpl,
651                              struct crypto_instance *inst)
652 {
653         struct crypto_larval *larval;
654         struct crypto_spawn *spawn;
655         u32 fips_internal = 0;
656         LIST_HEAD(algs_to_put);
657         int err;
658
659         err = crypto_check_alg(&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(&crypto_alg_sem);
667
668         larval = ERR_PTR(-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(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(&inst->alg, &algs_to_put);
689         if (IS_ERR(larval))
690                 goto unlock;
691         else if (larval)
692                 larval->test_started = true;
693
694         hlist_add_head(&inst->list, &tmpl->instances);
695         inst->tmpl = tmpl;
696
697 unlock:
698         up_write(&crypto_alg_sem);
699
700         if (IS_ERR(larval))
701                 return PTR_ERR(larval);
702         if (larval)
703                 crypto_wait_for_test(larval);
704         crypto_remove_final(&algs_to_put);
705         return 0;
706 }
707 EXPORT_SYMBOL_GPL(crypto_register_instance);
708
709 void crypto_unregister_instance(struct crypto_instance *inst)
710 {
711         LIST_HEAD(list);
712
713         down_write(&crypto_alg_sem);
714
715         crypto_remove_spawns(&inst->alg, &list, NULL);
716         crypto_remove_instance(inst, &list);
717
718         up_write(&crypto_alg_sem);
719
720         crypto_remove_final(&list);
721 }
722 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
723
724 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
725                       const char *name, u32 type, u32 mask)
726 {
727         struct crypto_alg *alg;
728         int err = -EAGAIN;
729
730         if (WARN_ON_ONCE(inst == NULL))
731                 return -EINVAL;
732
733         /* Allow the result of crypto_attr_alg_name() to be passed directly */
734         if (IS_ERR(name))
735                 return PTR_ERR(name);
736
737         alg = crypto_find_alg(name, spawn->frontend,
738                               type | CRYPTO_ALG_FIPS_INTERNAL, mask);
739         if (IS_ERR(alg))
740                 return PTR_ERR(alg);
741
742         down_write(&crypto_alg_sem);
743         if (!crypto_is_moribund(alg)) {
744                 list_add(&spawn->list, &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(&crypto_alg_sem);
754         if (err)
755                 crypto_mod_put(alg);
756         return err;
757 }
758 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
759
760 void crypto_drop_spawn(struct crypto_spawn *spawn)
761 {
762         if (!spawn->alg) /* not yet initialized? */
763                 return;
764
765         down_write(&crypto_alg_sem);
766         if (!spawn->dead)
767                 list_del(&spawn->list);
768         up_write(&crypto_alg_sem);
769
770         if (!spawn->registered)
771                 crypto_mod_put(spawn->alg);
772 }
773 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
774
775 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
776 {
777         struct crypto_alg *alg = ERR_PTR(-EAGAIN);
778         struct crypto_alg *target;
779         bool shoot = false;
780
781         down_read(&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(-EAGAIN);
788                 }
789         }
790         up_read(&crypto_alg_sem);
791
792         if (shoot) {
793                 crypto_shoot_alg(target);
794                 crypto_alg_put(target);
795         }
796
797         return alg;
798 }
799
800 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
801                                     u32 mask)
802 {
803         struct crypto_alg *alg;
804         struct crypto_tfm *tfm;
805
806         alg = crypto_spawn_alg(spawn);
807         if (IS_ERR(alg))
808                 return ERR_CAST(alg);
809
810         tfm = ERR_PTR(-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(tfm))
816                 goto out_put_alg;
817
818         return tfm;
819
820 out_put_alg:
821         crypto_mod_put(alg);
822         return tfm;
823 }
824 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
825
826 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
827 {
828         struct crypto_alg *alg;
829         struct crypto_tfm *tfm;
830
831         alg = crypto_spawn_alg(spawn);
832         if (IS_ERR(alg))
833                 return ERR_CAST(alg);
834
835         tfm = crypto_create_tfm(alg, spawn->frontend);
836         if (IS_ERR(tfm))
837                 goto out_put_alg;
838
839         return tfm;
840
841 out_put_alg:
842         crypto_mod_put(alg);
843         return tfm;
844 }
845 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
846
847 int crypto_register_notifier(struct notifier_block *nb)
848 {
849         return blocking_notifier_chain_register(&crypto_chain, nb);
850 }
851 EXPORT_SYMBOL_GPL(crypto_register_notifier);
852
853 int crypto_unregister_notifier(struct notifier_block *nb)
854 {
855         return blocking_notifier_chain_unregister(&crypto_chain, nb);
856 }
857 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
858
859 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
860 {
861         struct rtattr *rta = tb[0];
862         struct crypto_attr_type *algt;
863
864         if (!rta)
865                 return ERR_PTR(-ENOENT);
866         if (RTA_PAYLOAD(rta) < sizeof(*algt))
867                 return ERR_PTR(-EINVAL);
868         if (rta->rta_type != CRYPTOA_TYPE)
869                 return ERR_PTR(-EINVAL);
870
871         algt = RTA_DATA(rta);
872
873         return algt;
874 }
875 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
876
877 /**
878  * crypto_check_attr_type() - check algorithm type and compute inherited mask
879  * @tb: the template parameters
880  * @type: the algorithm type the template would be instantiated as
881  * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
882  *            to restrict the flags of any inner algorithms
883  *
884  * Validate that the algorithm type the user requested is compatible with the
885  * one the template would actually be instantiated as.  E.g., if the user is
886  * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
887  * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
888  *
889  * Also compute the mask to use to restrict the flags of any inner algorithms.
890  *
891  * Return: 0 on success; -errno on failure
892  */
893 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
894 {
895         struct crypto_attr_type *algt;
896
897         algt = crypto_get_attr_type(tb);
898         if (IS_ERR(algt))
899                 return PTR_ERR(algt);
900
901         if ((algt->type ^ type) & algt->mask)
902                 return -EINVAL;
903
904         *mask_ret = crypto_algt_inherited_mask(algt);
905         return 0;
906 }
907 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
908
909 const char *crypto_attr_alg_name(struct rtattr *rta)
910 {
911         struct crypto_attr_alg *alga;
912
913         if (!rta)
914                 return ERR_PTR(-ENOENT);
915         if (RTA_PAYLOAD(rta) < sizeof(*alga))
916                 return ERR_PTR(-EINVAL);
917         if (rta->rta_type != CRYPTOA_ALG)
918                 return ERR_PTR(-EINVAL);
919
920         alga = RTA_DATA(rta);
921         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
922
923         return alga->name;
924 }
925 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
926
927 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
928                         struct crypto_alg *alg)
929 {
930         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
931                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
932                 return -ENAMETOOLONG;
933
934         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
935                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
936                 return -ENAMETOOLONG;
937
938         return 0;
939 }
940 EXPORT_SYMBOL_GPL(crypto_inst_setname);
941
942 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
943 {
944         INIT_LIST_HEAD(&queue->list);
945         queue->backlog = &queue->list;
946         queue->qlen = 0;
947         queue->max_qlen = max_qlen;
948 }
949 EXPORT_SYMBOL_GPL(crypto_init_queue);
950
951 int crypto_enqueue_request(struct crypto_queue *queue,
952                            struct crypto_async_request *request)
953 {
954         int err = -EINPROGRESS;
955
956         if (unlikely(queue->qlen >= queue->max_qlen)) {
957                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
958                         err = -ENOSPC;
959                         goto out;
960                 }
961                 err = -EBUSY;
962                 if (queue->backlog == &queue->list)
963                         queue->backlog = &request->list;
964         }
965
966         queue->qlen++;
967         list_add_tail(&request->list, &queue->list);
968
969 out:
970         return err;
971 }
972 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
973
974 void crypto_enqueue_request_head(struct crypto_queue *queue,
975                                  struct crypto_async_request *request)
976 {
977         if (unlikely(queue->qlen >= queue->max_qlen))
978                 queue->backlog = queue->backlog->prev;
979
980         queue->qlen++;
981         list_add(&request->list, &queue->list);
982 }
983 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
984
985 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
986 {
987         struct list_head *request;
988
989         if (unlikely(!queue->qlen))
990                 return NULL;
991
992         queue->qlen--;
993
994         if (queue->backlog != &queue->list)
995                 queue->backlog = queue->backlog->next;
996
997         request = queue->list.next;
998         list_del(request);
999
1000         return list_entry(request, struct crypto_async_request, list);
1001 }
1002 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
1003
1004 static inline void crypto_inc_byte(u8 *a, unsigned int size)
1005 {
1006         u8 *b = (a + size);
1007         u8 c;
1008
1009         for (; size; size--) {
1010                 c = *--b + 1;
1011                 *b = c;
1012                 if (c)
1013                         break;
1014         }
1015 }
1016
1017 void crypto_inc(u8 *a, unsigned int size)
1018 {
1019         __be32 *b = (__be32 *)(a + size);
1020         u32 c;
1021
1022         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1023             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1024                 for (; size >= 4; size -= 4) {
1025                         c = be32_to_cpu(*--b) + 1;
1026                         *b = cpu_to_be32(c);
1027                         if (likely(c))
1028                                 return;
1029                 }
1030
1031         crypto_inc_byte(a, size);
1032 }
1033 EXPORT_SYMBOL_GPL(crypto_inc);
1034
1035 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1036 {
1037         return alg->cra_ctxsize +
1038                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1039 }
1040 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1041
1042 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1043                         u32 type, u32 mask)
1044 {
1045         int ret = 0;
1046         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1047
1048         if (!IS_ERR(alg)) {
1049                 crypto_mod_put(alg);
1050                 ret = 1;
1051         }
1052
1053         return ret;
1054 }
1055 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1056
1057 static void __init crypto_start_tests(void)
1058 {
1059         if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1060                 return;
1061
1062         for (;;) {
1063                 struct crypto_larval *larval = NULL;
1064                 struct crypto_alg *q;
1065
1066                 down_write(&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(q))
1072                                 continue;
1073
1074                         l = (void *)q;
1075
1076                         if (!crypto_is_test_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(&crypto_alg_sem);
1088
1089                 if (!larval)
1090                         break;
1091
1092                 crypto_wait_for_test(larval);
1093         }
1094
1095         set_crypto_boot_test_finished();
1096 }
1097
1098 static int __init crypto_algapi_init(void)
1099 {
1100         crypto_init_proc();
1101         crypto_start_tests();
1102         return 0;
1103 }
1104
1105 static void __exit crypto_algapi_exit(void)
1106 {
1107         crypto_exit_proc();
1108 }
1109
1110 /*
1111  * We run this at late_initcall so that all the built-in algorithms
1112  * have had a chance to register themselves first.
1113  */
1114 late_initcall(crypto_algapi_init);
1115 module_exit(crypto_algapi_exit);
1116
1117 MODULE_LICENSE("GPL");
1118 MODULE_DESCRIPTION("Cryptographic algorithms API");
1119 MODULE_SOFTDEP("pre: cryptomgr");