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
crypto_check_module_sig(struct module * mod)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
crypto_check_alg(struct crypto_alg * alg)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
crypto_free_instance(struct crypto_instance * inst)73 static void crypto_free_instance(struct crypto_instance *inst)
74 {
75 inst->alg.cra_type->free(inst);
76 }
77
crypto_destroy_instance_workfn(struct work_struct * w)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
crypto_destroy_instance(struct crypto_alg * alg)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 */
crypto_more_spawns(struct crypto_alg * alg,struct list_head * stack,struct list_head * top,struct list_head * secondary_spawns)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
crypto_remove_instance(struct crypto_instance * inst,struct list_head * list)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 */
crypto_remove_spawns(struct crypto_alg * alg,struct list_head * list,struct crypto_alg * nalg)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 = ⊤
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
crypto_alg_finish_registration(struct crypto_alg * alg,struct list_head * algs_to_put)237 static void crypto_alg_finish_registration(struct crypto_alg *alg,
238 struct list_head *algs_to_put)
239 {
240 struct crypto_alg *q;
241
242 list_for_each_entry(q, &crypto_alg_list, cra_list) {
243 if (q == alg)
244 continue;
245
246 if (crypto_is_moribund(q))
247 continue;
248
249 if (crypto_is_larval(q))
250 continue;
251
252 if (strcmp(alg->cra_name, q->cra_name))
253 continue;
254
255 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
256 q->cra_priority > alg->cra_priority)
257 continue;
258
259 crypto_remove_spawns(q, algs_to_put, alg);
260 }
261
262 crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
263 }
264
crypto_alloc_test_larval(struct crypto_alg * alg)265 static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
266 {
267 struct crypto_larval *larval;
268
269 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
270 IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
271 (alg->cra_flags & CRYPTO_ALG_INTERNAL))
272 return NULL; /* No self-test needed */
273
274 larval = crypto_larval_alloc(alg->cra_name,
275 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
276 if (IS_ERR(larval))
277 return larval;
278
279 larval->adult = crypto_mod_get(alg);
280 if (!larval->adult) {
281 kfree(larval);
282 return ERR_PTR(-ENOENT);
283 }
284
285 refcount_set(&larval->alg.cra_refcnt, 1);
286 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
287 CRYPTO_MAX_ALG_NAME);
288 larval->alg.cra_priority = alg->cra_priority;
289
290 return larval;
291 }
292
293 static struct crypto_larval *
__crypto_register_alg(struct crypto_alg * alg,struct list_head * algs_to_put)294 __crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
295 {
296 struct crypto_alg *q;
297 struct crypto_larval *larval;
298 int ret = -EAGAIN;
299
300 if (crypto_is_dead(alg))
301 goto err;
302
303 INIT_LIST_HEAD(&alg->cra_users);
304
305 ret = -EEXIST;
306
307 list_for_each_entry(q, &crypto_alg_list, cra_list) {
308 if (q == alg)
309 goto err;
310
311 if (crypto_is_moribund(q))
312 continue;
313
314 if (crypto_is_larval(q)) {
315 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
316 goto err;
317 continue;
318 }
319
320 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
321 !strcmp(q->cra_driver_name, alg->cra_driver_name) ||
322 !strcmp(q->cra_name, alg->cra_driver_name))
323 goto err;
324 }
325
326 larval = crypto_alloc_test_larval(alg);
327 if (IS_ERR(larval))
328 goto out;
329
330 list_add(&alg->cra_list, &crypto_alg_list);
331
332 if (larval) {
333 /* No cheating! */
334 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
335
336 list_add(&larval->alg.cra_list, &crypto_alg_list);
337 } else {
338 alg->cra_flags |= CRYPTO_ALG_TESTED;
339 crypto_alg_finish_registration(alg, algs_to_put);
340 }
341
342 out:
343 return larval;
344
345 err:
346 larval = ERR_PTR(ret);
347 goto out;
348 }
349
crypto_alg_tested(const char * name,int err)350 void crypto_alg_tested(const char *name, int err)
351 {
352 struct crypto_larval *test;
353 struct crypto_alg *alg;
354 struct crypto_alg *q;
355 LIST_HEAD(list);
356
357 down_write(&crypto_alg_sem);
358 list_for_each_entry(q, &crypto_alg_list, cra_list) {
359 if (crypto_is_moribund(q) || !crypto_is_larval(q))
360 continue;
361
362 test = (struct crypto_larval *)q;
363
364 if (!strcmp(q->cra_driver_name, name))
365 goto found;
366 }
367
368 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
369 up_write(&crypto_alg_sem);
370 return;
371
372 found:
373 q->cra_flags |= CRYPTO_ALG_DEAD;
374 alg = test->adult;
375
376 if (list_empty(&alg->cra_list))
377 goto complete;
378
379 if (err == -ECANCELED)
380 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
381 else if (err)
382 goto complete;
383 else
384 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
385
386 alg->cra_flags |= CRYPTO_ALG_TESTED;
387
388 crypto_alg_finish_registration(alg, &list);
389
390 complete:
391 list_del_init(&test->alg.cra_list);
392 complete_all(&test->completion);
393
394 up_write(&crypto_alg_sem);
395
396 crypto_alg_put(&test->alg);
397 crypto_remove_final(&list);
398 }
399 EXPORT_SYMBOL_GPL(crypto_alg_tested);
400
crypto_remove_final(struct list_head * list)401 void crypto_remove_final(struct list_head *list)
402 {
403 struct crypto_alg *alg;
404 struct crypto_alg *n;
405
406 list_for_each_entry_safe(alg, n, list, cra_list) {
407 list_del_init(&alg->cra_list);
408 crypto_alg_put(alg);
409 }
410 }
411 EXPORT_SYMBOL_GPL(crypto_remove_final);
412
crypto_register_alg(struct crypto_alg * alg)413 int crypto_register_alg(struct crypto_alg *alg)
414 {
415 struct crypto_larval *larval;
416 LIST_HEAD(algs_to_put);
417 int err;
418
419 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
420 err = crypto_check_alg(alg);
421 if (err)
422 return err;
423
424 down_write(&crypto_alg_sem);
425 larval = __crypto_register_alg(alg, &algs_to_put);
426 if (!IS_ERR_OR_NULL(larval)) {
427 bool test_started = crypto_boot_test_finished();
428
429 larval->test_started = test_started;
430 if (test_started)
431 crypto_schedule_test(larval);
432 }
433 up_write(&crypto_alg_sem);
434
435 if (IS_ERR(larval))
436 return PTR_ERR(larval);
437 crypto_remove_final(&algs_to_put);
438 return 0;
439 }
440 EXPORT_SYMBOL_GPL(crypto_register_alg);
441
crypto_remove_alg(struct crypto_alg * alg,struct list_head * list)442 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
443 {
444 if (unlikely(list_empty(&alg->cra_list)))
445 return -ENOENT;
446
447 alg->cra_flags |= CRYPTO_ALG_DEAD;
448
449 list_del_init(&alg->cra_list);
450 crypto_remove_spawns(alg, list, NULL);
451
452 return 0;
453 }
454
crypto_unregister_alg(struct crypto_alg * alg)455 void crypto_unregister_alg(struct crypto_alg *alg)
456 {
457 int ret;
458 LIST_HEAD(list);
459
460 down_write(&crypto_alg_sem);
461 ret = crypto_remove_alg(alg, &list);
462 up_write(&crypto_alg_sem);
463
464 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
465 return;
466
467 if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
468 return;
469
470 if (alg->cra_destroy)
471 alg->cra_destroy(alg);
472
473 crypto_remove_final(&list);
474 }
475 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
476
crypto_register_algs(struct crypto_alg * algs,int count)477 int crypto_register_algs(struct crypto_alg *algs, int count)
478 {
479 int i, ret;
480
481 for (i = 0; i < count; i++) {
482 ret = crypto_register_alg(&algs[i]);
483 if (ret)
484 goto err;
485 }
486
487 return 0;
488
489 err:
490 for (--i; i >= 0; --i)
491 crypto_unregister_alg(&algs[i]);
492
493 return ret;
494 }
495 EXPORT_SYMBOL_GPL(crypto_register_algs);
496
crypto_unregister_algs(struct crypto_alg * algs,int count)497 void crypto_unregister_algs(struct crypto_alg *algs, int count)
498 {
499 int i;
500
501 for (i = 0; i < count; i++)
502 crypto_unregister_alg(&algs[i]);
503 }
504 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
505
crypto_register_template(struct crypto_template * tmpl)506 int crypto_register_template(struct crypto_template *tmpl)
507 {
508 struct crypto_template *q;
509 int err = -EEXIST;
510
511 down_write(&crypto_alg_sem);
512
513 crypto_check_module_sig(tmpl->module);
514
515 list_for_each_entry(q, &crypto_template_list, list) {
516 if (q == tmpl)
517 goto out;
518 }
519
520 list_add(&tmpl->list, &crypto_template_list);
521 err = 0;
522 out:
523 up_write(&crypto_alg_sem);
524 return err;
525 }
526 EXPORT_SYMBOL_GPL(crypto_register_template);
527
crypto_register_templates(struct crypto_template * tmpls,int count)528 int crypto_register_templates(struct crypto_template *tmpls, int count)
529 {
530 int i, err;
531
532 for (i = 0; i < count; i++) {
533 err = crypto_register_template(&tmpls[i]);
534 if (err)
535 goto out;
536 }
537 return 0;
538
539 out:
540 for (--i; i >= 0; --i)
541 crypto_unregister_template(&tmpls[i]);
542 return err;
543 }
544 EXPORT_SYMBOL_GPL(crypto_register_templates);
545
crypto_unregister_template(struct crypto_template * tmpl)546 void crypto_unregister_template(struct crypto_template *tmpl)
547 {
548 struct crypto_instance *inst;
549 struct hlist_node *n;
550 struct hlist_head *list;
551 LIST_HEAD(users);
552
553 down_write(&crypto_alg_sem);
554
555 BUG_ON(list_empty(&tmpl->list));
556 list_del_init(&tmpl->list);
557
558 list = &tmpl->instances;
559 hlist_for_each_entry(inst, list, list) {
560 int err = crypto_remove_alg(&inst->alg, &users);
561
562 BUG_ON(err);
563 }
564
565 up_write(&crypto_alg_sem);
566
567 hlist_for_each_entry_safe(inst, n, list, list) {
568 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
569 crypto_free_instance(inst);
570 }
571 crypto_remove_final(&users);
572 }
573 EXPORT_SYMBOL_GPL(crypto_unregister_template);
574
crypto_unregister_templates(struct crypto_template * tmpls,int count)575 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
576 {
577 int i;
578
579 for (i = count - 1; i >= 0; --i)
580 crypto_unregister_template(&tmpls[i]);
581 }
582 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
583
__crypto_lookup_template(const char * name)584 static struct crypto_template *__crypto_lookup_template(const char *name)
585 {
586 struct crypto_template *q, *tmpl = NULL;
587
588 down_read(&crypto_alg_sem);
589 list_for_each_entry(q, &crypto_template_list, list) {
590 if (strcmp(q->name, name))
591 continue;
592 if (unlikely(!crypto_tmpl_get(q)))
593 continue;
594
595 tmpl = q;
596 break;
597 }
598 up_read(&crypto_alg_sem);
599
600 return tmpl;
601 }
602
crypto_lookup_template(const char * name)603 struct crypto_template *crypto_lookup_template(const char *name)
604 {
605 return try_then_request_module(__crypto_lookup_template(name),
606 "crypto-%s", name);
607 }
608 EXPORT_SYMBOL_GPL(crypto_lookup_template);
609
crypto_register_instance(struct crypto_template * tmpl,struct crypto_instance * inst)610 int crypto_register_instance(struct crypto_template *tmpl,
611 struct crypto_instance *inst)
612 {
613 struct crypto_larval *larval;
614 struct crypto_spawn *spawn;
615 u32 fips_internal = 0;
616 LIST_HEAD(algs_to_put);
617 int err;
618
619 err = crypto_check_alg(&inst->alg);
620 if (err)
621 return err;
622
623 inst->alg.cra_module = tmpl->module;
624 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
625
626 down_write(&crypto_alg_sem);
627
628 larval = ERR_PTR(-EAGAIN);
629 for (spawn = inst->spawns; spawn;) {
630 struct crypto_spawn *next;
631
632 if (spawn->dead)
633 goto unlock;
634
635 next = spawn->next;
636 spawn->inst = inst;
637 spawn->registered = true;
638
639 fips_internal |= spawn->alg->cra_flags;
640
641 crypto_mod_put(spawn->alg);
642
643 spawn = next;
644 }
645
646 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
647
648 larval = __crypto_register_alg(&inst->alg, &algs_to_put);
649 if (IS_ERR(larval))
650 goto unlock;
651 else if (larval) {
652 larval->test_started = true;
653 crypto_schedule_test(larval);
654 }
655
656 hlist_add_head(&inst->list, &tmpl->instances);
657 inst->tmpl = tmpl;
658
659 unlock:
660 up_write(&crypto_alg_sem);
661
662 if (IS_ERR(larval))
663 return PTR_ERR(larval);
664 crypto_remove_final(&algs_to_put);
665 return 0;
666 }
667 EXPORT_SYMBOL_GPL(crypto_register_instance);
668
crypto_unregister_instance(struct crypto_instance * inst)669 void crypto_unregister_instance(struct crypto_instance *inst)
670 {
671 LIST_HEAD(list);
672
673 down_write(&crypto_alg_sem);
674
675 crypto_remove_spawns(&inst->alg, &list, NULL);
676 crypto_remove_instance(inst, &list);
677
678 up_write(&crypto_alg_sem);
679
680 crypto_remove_final(&list);
681 }
682 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
683
crypto_grab_spawn(struct crypto_spawn * spawn,struct crypto_instance * inst,const char * name,u32 type,u32 mask)684 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
685 const char *name, u32 type, u32 mask)
686 {
687 struct crypto_alg *alg;
688 int err = -EAGAIN;
689
690 if (WARN_ON_ONCE(inst == NULL))
691 return -EINVAL;
692
693 /* Allow the result of crypto_attr_alg_name() to be passed directly */
694 if (IS_ERR(name))
695 return PTR_ERR(name);
696
697 alg = crypto_find_alg(name, spawn->frontend,
698 type | CRYPTO_ALG_FIPS_INTERNAL, mask);
699 if (IS_ERR(alg))
700 return PTR_ERR(alg);
701
702 down_write(&crypto_alg_sem);
703 if (!crypto_is_moribund(alg)) {
704 list_add(&spawn->list, &alg->cra_users);
705 spawn->alg = alg;
706 spawn->mask = mask;
707 spawn->next = inst->spawns;
708 inst->spawns = spawn;
709 inst->alg.cra_flags |=
710 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
711 err = 0;
712 }
713 up_write(&crypto_alg_sem);
714 if (err)
715 crypto_mod_put(alg);
716 return err;
717 }
718 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
719
crypto_drop_spawn(struct crypto_spawn * spawn)720 void crypto_drop_spawn(struct crypto_spawn *spawn)
721 {
722 if (!spawn->alg) /* not yet initialized? */
723 return;
724
725 down_write(&crypto_alg_sem);
726 if (!spawn->dead)
727 list_del(&spawn->list);
728 up_write(&crypto_alg_sem);
729
730 if (!spawn->registered)
731 crypto_mod_put(spawn->alg);
732 }
733 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
734
crypto_spawn_alg(struct crypto_spawn * spawn)735 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
736 {
737 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
738 struct crypto_alg *target;
739 bool shoot = false;
740
741 down_read(&crypto_alg_sem);
742 if (!spawn->dead) {
743 alg = spawn->alg;
744 if (!crypto_mod_get(alg)) {
745 target = crypto_alg_get(alg);
746 shoot = true;
747 alg = ERR_PTR(-EAGAIN);
748 }
749 }
750 up_read(&crypto_alg_sem);
751
752 if (shoot) {
753 crypto_shoot_alg(target);
754 crypto_alg_put(target);
755 }
756
757 return alg;
758 }
759
crypto_spawn_tfm(struct crypto_spawn * spawn,u32 type,u32 mask)760 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
761 u32 mask)
762 {
763 struct crypto_alg *alg;
764 struct crypto_tfm *tfm;
765
766 alg = crypto_spawn_alg(spawn);
767 if (IS_ERR(alg))
768 return ERR_CAST(alg);
769
770 tfm = ERR_PTR(-EINVAL);
771 if (unlikely((alg->cra_flags ^ type) & mask))
772 goto out_put_alg;
773
774 tfm = __crypto_alloc_tfm(alg, type, mask);
775 if (IS_ERR(tfm))
776 goto out_put_alg;
777
778 return tfm;
779
780 out_put_alg:
781 crypto_mod_put(alg);
782 return tfm;
783 }
784 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
785
crypto_spawn_tfm2(struct crypto_spawn * spawn)786 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
787 {
788 struct crypto_alg *alg;
789 struct crypto_tfm *tfm;
790
791 alg = crypto_spawn_alg(spawn);
792 if (IS_ERR(alg))
793 return ERR_CAST(alg);
794
795 tfm = crypto_create_tfm(alg, spawn->frontend);
796 if (IS_ERR(tfm))
797 goto out_put_alg;
798
799 return tfm;
800
801 out_put_alg:
802 crypto_mod_put(alg);
803 return tfm;
804 }
805 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
806
crypto_register_notifier(struct notifier_block * nb)807 int crypto_register_notifier(struct notifier_block *nb)
808 {
809 return blocking_notifier_chain_register(&crypto_chain, nb);
810 }
811 EXPORT_SYMBOL_GPL(crypto_register_notifier);
812
crypto_unregister_notifier(struct notifier_block * nb)813 int crypto_unregister_notifier(struct notifier_block *nb)
814 {
815 return blocking_notifier_chain_unregister(&crypto_chain, nb);
816 }
817 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
818
crypto_get_attr_type(struct rtattr ** tb)819 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
820 {
821 struct rtattr *rta = tb[0];
822 struct crypto_attr_type *algt;
823
824 if (!rta)
825 return ERR_PTR(-ENOENT);
826 if (RTA_PAYLOAD(rta) < sizeof(*algt))
827 return ERR_PTR(-EINVAL);
828 if (rta->rta_type != CRYPTOA_TYPE)
829 return ERR_PTR(-EINVAL);
830
831 algt = RTA_DATA(rta);
832
833 return algt;
834 }
835 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
836
837 /**
838 * crypto_check_attr_type() - check algorithm type and compute inherited mask
839 * @tb: the template parameters
840 * @type: the algorithm type the template would be instantiated as
841 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
842 * to restrict the flags of any inner algorithms
843 *
844 * Validate that the algorithm type the user requested is compatible with the
845 * one the template would actually be instantiated as. E.g., if the user is
846 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
847 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
848 *
849 * Also compute the mask to use to restrict the flags of any inner algorithms.
850 *
851 * Return: 0 on success; -errno on failure
852 */
crypto_check_attr_type(struct rtattr ** tb,u32 type,u32 * mask_ret)853 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
854 {
855 struct crypto_attr_type *algt;
856
857 algt = crypto_get_attr_type(tb);
858 if (IS_ERR(algt))
859 return PTR_ERR(algt);
860
861 if ((algt->type ^ type) & algt->mask)
862 return -EINVAL;
863
864 *mask_ret = crypto_algt_inherited_mask(algt);
865 return 0;
866 }
867 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
868
crypto_attr_alg_name(struct rtattr * rta)869 const char *crypto_attr_alg_name(struct rtattr *rta)
870 {
871 struct crypto_attr_alg *alga;
872
873 if (!rta)
874 return ERR_PTR(-ENOENT);
875 if (RTA_PAYLOAD(rta) < sizeof(*alga))
876 return ERR_PTR(-EINVAL);
877 if (rta->rta_type != CRYPTOA_ALG)
878 return ERR_PTR(-EINVAL);
879
880 alga = RTA_DATA(rta);
881 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
882
883 return alga->name;
884 }
885 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
886
crypto_inst_setname(struct crypto_instance * inst,const char * name,struct crypto_alg * alg)887 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
888 struct crypto_alg *alg)
889 {
890 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
891 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
892 return -ENAMETOOLONG;
893
894 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
895 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
896 return -ENAMETOOLONG;
897
898 return 0;
899 }
900 EXPORT_SYMBOL_GPL(crypto_inst_setname);
901
crypto_init_queue(struct crypto_queue * queue,unsigned int max_qlen)902 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
903 {
904 INIT_LIST_HEAD(&queue->list);
905 queue->backlog = &queue->list;
906 queue->qlen = 0;
907 queue->max_qlen = max_qlen;
908 }
909 EXPORT_SYMBOL_GPL(crypto_init_queue);
910
crypto_enqueue_request(struct crypto_queue * queue,struct crypto_async_request * request)911 int crypto_enqueue_request(struct crypto_queue *queue,
912 struct crypto_async_request *request)
913 {
914 int err = -EINPROGRESS;
915
916 if (unlikely(queue->qlen >= queue->max_qlen)) {
917 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
918 err = -ENOSPC;
919 goto out;
920 }
921 err = -EBUSY;
922 if (queue->backlog == &queue->list)
923 queue->backlog = &request->list;
924 }
925
926 queue->qlen++;
927 list_add_tail(&request->list, &queue->list);
928
929 out:
930 return err;
931 }
932 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
933
crypto_enqueue_request_head(struct crypto_queue * queue,struct crypto_async_request * request)934 void crypto_enqueue_request_head(struct crypto_queue *queue,
935 struct crypto_async_request *request)
936 {
937 if (unlikely(queue->qlen >= queue->max_qlen))
938 queue->backlog = queue->backlog->prev;
939
940 queue->qlen++;
941 list_add(&request->list, &queue->list);
942 }
943 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
944
crypto_dequeue_request(struct crypto_queue * queue)945 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
946 {
947 struct list_head *request;
948
949 if (unlikely(!queue->qlen))
950 return NULL;
951
952 queue->qlen--;
953
954 if (queue->backlog != &queue->list)
955 queue->backlog = queue->backlog->next;
956
957 request = queue->list.next;
958 list_del(request);
959
960 return list_entry(request, struct crypto_async_request, list);
961 }
962 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
963
crypto_inc_byte(u8 * a,unsigned int size)964 static inline void crypto_inc_byte(u8 *a, unsigned int size)
965 {
966 u8 *b = (a + size);
967 u8 c;
968
969 for (; size; size--) {
970 c = *--b + 1;
971 *b = c;
972 if (c)
973 break;
974 }
975 }
976
crypto_inc(u8 * a,unsigned int size)977 void crypto_inc(u8 *a, unsigned int size)
978 {
979 __be32 *b = (__be32 *)(a + size);
980 u32 c;
981
982 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
983 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
984 for (; size >= 4; size -= 4) {
985 c = be32_to_cpu(*--b) + 1;
986 *b = cpu_to_be32(c);
987 if (likely(c))
988 return;
989 }
990
991 crypto_inc_byte(a, size);
992 }
993 EXPORT_SYMBOL_GPL(crypto_inc);
994
crypto_alg_extsize(struct crypto_alg * alg)995 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
996 {
997 return alg->cra_ctxsize +
998 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
999 }
1000 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1001
crypto_type_has_alg(const char * name,const struct crypto_type * frontend,u32 type,u32 mask)1002 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1003 u32 type, u32 mask)
1004 {
1005 int ret = 0;
1006 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1007
1008 if (!IS_ERR(alg)) {
1009 crypto_mod_put(alg);
1010 ret = 1;
1011 }
1012
1013 return ret;
1014 }
1015 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1016
crypto_start_tests(void)1017 static void __init crypto_start_tests(void)
1018 {
1019 if (!IS_BUILTIN(CONFIG_CRYPTO_ALGAPI))
1020 return;
1021
1022 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1023 return;
1024
1025 for (;;) {
1026 struct crypto_larval *larval = NULL;
1027 struct crypto_alg *q;
1028
1029 down_write(&crypto_alg_sem);
1030
1031 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1032 struct crypto_larval *l;
1033
1034 if (!crypto_is_larval(q))
1035 continue;
1036
1037 l = (void *)q;
1038
1039 if (!crypto_is_test_larval(l))
1040 continue;
1041
1042 if (l->test_started)
1043 continue;
1044
1045 l->test_started = true;
1046 larval = l;
1047 crypto_schedule_test(larval);
1048 break;
1049 }
1050
1051 up_write(&crypto_alg_sem);
1052
1053 if (!larval)
1054 break;
1055 }
1056
1057 set_crypto_boot_test_finished();
1058 }
1059
crypto_algapi_init(void)1060 static int __init crypto_algapi_init(void)
1061 {
1062 crypto_init_proc();
1063 crypto_start_tests();
1064 return 0;
1065 }
1066
crypto_algapi_exit(void)1067 static void __exit crypto_algapi_exit(void)
1068 {
1069 crypto_exit_proc();
1070 }
1071
1072 /*
1073 * We run this at late_initcall so that all the built-in algorithms
1074 * have had a chance to register themselves first.
1075 */
1076 late_initcall(crypto_algapi_init);
1077 module_exit(crypto_algapi_exit);
1078
1079 MODULE_LICENSE("GPL");
1080 MODULE_DESCRIPTION("Cryptographic algorithms API");
1081 MODULE_SOFTDEP("pre: cryptomgr");
1082