1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/algapi.h>
9#include <crypto/internal/simd.h>
10#include <linux/err.h>
11#include <linux/errno.h>
12#include <linux/fips.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/list.h>
16#include <linux/module.h>
17#include <linux/rtnetlink.h>
18#include <linux/slab.h>
19#include <linux/string.h>
20#include <linux/workqueue.h>
21
22#include "internal.h"
23
24static LIST_HEAD(crypto_template_list);
25
26#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
27DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
28EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
29#endif
30
31static inline void crypto_check_module_sig(struct module *mod)
32{
33	if (fips_enabled && mod && !module_sig_ok(mod))
34		panic("Module %s signature verification failed in FIPS mode\n",
35		      module_name(mod));
36}
37
38static int crypto_check_alg(struct crypto_alg *alg)
39{
40	crypto_check_module_sig(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
73static void crypto_free_instance(struct crypto_instance *inst)
74{
75	inst->alg.cra_type->free(inst);
76}
77
78static void crypto_destroy_instance_workfn(struct work_struct *w)
79{
80	struct crypto_instance *inst = container_of(w, struct crypto_instance,
81						    free_work);
82	struct crypto_template *tmpl = inst->tmpl;
83
84	crypto_free_instance(inst);
85	crypto_tmpl_put(tmpl);
86}
87
88static void crypto_destroy_instance(struct crypto_alg *alg)
89{
90	struct crypto_instance *inst = container_of(alg,
91						    struct crypto_instance,
92						    alg);
93
94	INIT_WORK(&inst->free_work, crypto_destroy_instance_workfn);
95	schedule_work(&inst->free_work);
96}
97
98/*
99 * This function adds a spawn to the list secondary_spawns which
100 * will be used at the end of crypto_remove_spawns to unregister
101 * instances, unless the spawn happens to be one that is depended
102 * on by the new algorithm (nalg in crypto_remove_spawns).
103 *
104 * This function is also responsible for resurrecting any algorithms
105 * in the dependency chain of nalg by unsetting n->dead.
106 */
107static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
108					    struct list_head *stack,
109					    struct list_head *top,
110					    struct list_head *secondary_spawns)
111{
112	struct crypto_spawn *spawn, *n;
113
114	spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
115	if (!spawn)
116		return NULL;
117
118	n = list_prev_entry(spawn, list);
119	list_move(&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
131static void crypto_remove_instance(struct crypto_instance *inst,
132				   struct list_head *list)
133{
134	struct crypto_template *tmpl = inst->tmpl;
135
136	if (crypto_is_dead(&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 */
157void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
158			  struct crypto_alg *nalg)
159{
160	u32 new_type = (nalg ?: alg)->cra_flags;
161	struct crypto_spawn *spawn, *n;
162	LIST_HEAD(secondary_spawns);
163	struct list_head *spawns;
164	LIST_HEAD(stack);
165	LIST_HEAD(top);
166
167	spawns = &alg->cra_users;
168	list_for_each_entry_safe(spawn, n, spawns, list) {
169		if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
170			continue;
171
172		list_move(&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}
235EXPORT_SYMBOL_GPL(crypto_remove_spawns);
236
237static void crypto_alg_finish_registration(struct crypto_alg *alg,
238					   bool fulfill_requests,
239					   struct list_head *algs_to_put)
240{
241	struct crypto_alg *q;
242
243	list_for_each_entry(q, &crypto_alg_list, cra_list) {
244		if (q == alg)
245			continue;
246
247		if (crypto_is_moribund(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
288static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
289{
290	struct crypto_larval *larval;
291
292	if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
293	    IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
294	    (alg->cra_flags & CRYPTO_ALG_INTERNAL))
295		return NULL; /* No self-test needed */
296
297	larval = crypto_larval_alloc(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
316static struct crypto_larval *
317__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
318{
319	struct crypto_alg *q;
320	struct crypto_larval *larval;
321	int ret = -EAGAIN;
322
323	if (crypto_is_dead(alg))
324		goto err;
325
326	INIT_LIST_HEAD(&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
365out:
366	return larval;
367
368err:
369	larval = ERR_PTR(ret);
370	goto out;
371}
372
373void crypto_alg_tested(const char *name, int err)
374{
375	struct crypto_larval *test;
376	struct crypto_alg *alg;
377	struct crypto_alg *q;
378	LIST_HEAD(list);
379	bool best;
380
381	down_write(&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
395found:
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
431complete:
432	complete_all(&test->completion);
433
434unlock:
435	up_write(&crypto_alg_sem);
436
437	crypto_remove_final(&list);
438}
439EXPORT_SYMBOL_GPL(crypto_alg_tested);
440
441void crypto_remove_final(struct list_head *list)
442{
443	struct crypto_alg *alg;
444	struct crypto_alg *n;
445
446	list_for_each_entry_safe(alg, n, list, cra_list) {
447		list_del_init(&alg->cra_list);
448		crypto_alg_put(alg);
449	}
450}
451EXPORT_SYMBOL_GPL(crypto_remove_final);
452
453int crypto_register_alg(struct crypto_alg *alg)
454{
455	struct crypto_larval *larval;
456	LIST_HEAD(algs_to_put);
457	bool test_started = false;
458	int err;
459
460	alg->cra_flags &= ~CRYPTO_ALG_DEAD;
461	err = crypto_check_alg(alg);
462	if (err)
463		return err;
464
465	down_write(&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}
480EXPORT_SYMBOL_GPL(crypto_register_alg);
481
482static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
483{
484	if (unlikely(list_empty(&alg->cra_list)))
485		return -ENOENT;
486
487	alg->cra_flags |= CRYPTO_ALG_DEAD;
488
489	list_del_init(&alg->cra_list);
490	crypto_remove_spawns(alg, list, NULL);
491
492	return 0;
493}
494
495void crypto_unregister_alg(struct crypto_alg *alg)
496{
497	int ret;
498	LIST_HEAD(list);
499
500	down_write(&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}
515EXPORT_SYMBOL_GPL(crypto_unregister_alg);
516
517int crypto_register_algs(struct crypto_alg *algs, int count)
518{
519	int i, ret;
520
521	for (i = 0; i < count; i++) {
522		ret = crypto_register_alg(&algs[i]);
523		if (ret)
524			goto err;
525	}
526
527	return 0;
528
529err:
530	for (--i; i >= 0; --i)
531		crypto_unregister_alg(&algs[i]);
532
533	return ret;
534}
535EXPORT_SYMBOL_GPL(crypto_register_algs);
536
537void crypto_unregister_algs(struct crypto_alg *algs, int count)
538{
539	int i;
540
541	for (i = 0; i < count; i++)
542		crypto_unregister_alg(&algs[i]);
543}
544EXPORT_SYMBOL_GPL(crypto_unregister_algs);
545
546int crypto_register_template(struct crypto_template *tmpl)
547{
548	struct crypto_template *q;
549	int err = -EEXIST;
550
551	down_write(&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;
562out:
563	up_write(&crypto_alg_sem);
564	return err;
565}
566EXPORT_SYMBOL_GPL(crypto_register_template);
567
568int crypto_register_templates(struct crypto_template *tmpls, int count)
569{
570	int i, err;
571
572	for (i = 0; i < count; i++) {
573		err = crypto_register_template(&tmpls[i]);
574		if (err)
575			goto out;
576	}
577	return 0;
578
579out:
580	for (--i; i >= 0; --i)
581		crypto_unregister_template(&tmpls[i]);
582	return err;
583}
584EXPORT_SYMBOL_GPL(crypto_register_templates);
585
586void crypto_unregister_template(struct crypto_template *tmpl)
587{
588	struct crypto_instance *inst;
589	struct hlist_node *n;
590	struct hlist_head *list;
591	LIST_HEAD(users);
592
593	down_write(&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}
613EXPORT_SYMBOL_GPL(crypto_unregister_template);
614
615void crypto_unregister_templates(struct crypto_template *tmpls, int count)
616{
617	int i;
618
619	for (i = count - 1; i >= 0; --i)
620		crypto_unregister_template(&tmpls[i]);
621}
622EXPORT_SYMBOL_GPL(crypto_unregister_templates);
623
624static struct crypto_template *__crypto_lookup_template(const char *name)
625{
626	struct crypto_template *q, *tmpl = NULL;
627
628	down_read(&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
643struct crypto_template *crypto_lookup_template(const char *name)
644{
645	return try_then_request_module(__crypto_lookup_template(name),
646				       "crypto-%s", name);
647}
648EXPORT_SYMBOL_GPL(crypto_lookup_template);
649
650int crypto_register_instance(struct crypto_template *tmpl,
651			     struct crypto_instance *inst)
652{
653	struct crypto_larval *larval;
654	struct crypto_spawn *spawn;
655	u32 fips_internal = 0;
656	LIST_HEAD(algs_to_put);
657	int err;
658
659	err = crypto_check_alg(&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
697unlock:
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}
707EXPORT_SYMBOL_GPL(crypto_register_instance);
708
709void 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}
722EXPORT_SYMBOL_GPL(crypto_unregister_instance);
723
724int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
725		      const char *name, u32 type, u32 mask)
726{
727	struct crypto_alg *alg;
728	int err = -EAGAIN;
729
730	if (WARN_ON_ONCE(inst == NULL))
731		return -EINVAL;
732
733	/* Allow the result of crypto_attr_alg_name() to be passed directly */
734	if (IS_ERR(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}
758EXPORT_SYMBOL_GPL(crypto_grab_spawn);
759
760void crypto_drop_spawn(struct crypto_spawn *spawn)
761{
762	if (!spawn->alg) /* not yet initialized? */
763		return;
764
765	down_write(&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}
773EXPORT_SYMBOL_GPL(crypto_drop_spawn);
774
775static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
776{
777	struct crypto_alg *alg = ERR_PTR(-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
800struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
801				    u32 mask)
802{
803	struct crypto_alg *alg;
804	struct crypto_tfm *tfm;
805
806	alg = crypto_spawn_alg(spawn);
807	if (IS_ERR(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
820out_put_alg:
821	crypto_mod_put(alg);
822	return tfm;
823}
824EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
825
826void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
827{
828	struct crypto_alg *alg;
829	struct crypto_tfm *tfm;
830
831	alg = crypto_spawn_alg(spawn);
832	if (IS_ERR(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
841out_put_alg:
842	crypto_mod_put(alg);
843	return tfm;
844}
845EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
846
847int crypto_register_notifier(struct notifier_block *nb)
848{
849	return blocking_notifier_chain_register(&crypto_chain, nb);
850}
851EXPORT_SYMBOL_GPL(crypto_register_notifier);
852
853int crypto_unregister_notifier(struct notifier_block *nb)
854{
855	return blocking_notifier_chain_unregister(&crypto_chain, nb);
856}
857EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
858
859struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
860{
861	struct rtattr *rta = tb[0];
862	struct crypto_attr_type *algt;
863
864	if (!rta)
865		return ERR_PTR(-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}
875EXPORT_SYMBOL_GPL(crypto_get_attr_type);
876
877/**
878 * crypto_check_attr_type() - check algorithm type and compute inherited mask
879 * @tb: the template parameters
880 * @type: the algorithm type the template would be instantiated as
881 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
882 *	      to restrict the flags of any inner algorithms
883 *
884 * Validate that the algorithm type the user requested is compatible with the
885 * one the template would actually be instantiated as.  E.g., if the user is
886 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
887 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
888 *
889 * Also compute the mask to use to restrict the flags of any inner algorithms.
890 *
891 * Return: 0 on success; -errno on failure
892 */
893int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
894{
895	struct crypto_attr_type *algt;
896
897	algt = crypto_get_attr_type(tb);
898	if (IS_ERR(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}
907EXPORT_SYMBOL_GPL(crypto_check_attr_type);
908
909const char *crypto_attr_alg_name(struct rtattr *rta)
910{
911	struct crypto_attr_alg *alga;
912
913	if (!rta)
914		return ERR_PTR(-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}
925EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
926
927int crypto_inst_setname(struct crypto_instance *inst, const char *name,
928			struct crypto_alg *alg)
929{
930	if (snprintf(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}
940EXPORT_SYMBOL_GPL(crypto_inst_setname);
941
942void 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}
949EXPORT_SYMBOL_GPL(crypto_init_queue);
950
951int crypto_enqueue_request(struct crypto_queue *queue,
952			   struct crypto_async_request *request)
953{
954	int err = -EINPROGRESS;
955
956	if (unlikely(queue->qlen >= queue->max_qlen)) {
957		if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
958			err = -ENOSPC;
959			goto out;
960		}
961		err = -EBUSY;
962		if (queue->backlog == &queue->list)
963			queue->backlog = &request->list;
964	}
965
966	queue->qlen++;
967	list_add_tail(&request->list, &queue->list);
968
969out:
970	return err;
971}
972EXPORT_SYMBOL_GPL(crypto_enqueue_request);
973
974void crypto_enqueue_request_head(struct crypto_queue *queue,
975				 struct crypto_async_request *request)
976{
977	if (unlikely(queue->qlen >= queue->max_qlen))
978		queue->backlog = queue->backlog->prev;
979
980	queue->qlen++;
981	list_add(&request->list, &queue->list);
982}
983EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
984
985struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
986{
987	struct list_head *request;
988
989	if (unlikely(!queue->qlen))
990		return NULL;
991
992	queue->qlen--;
993
994	if (queue->backlog != &queue->list)
995		queue->backlog = queue->backlog->next;
996
997	request = queue->list.next;
998	list_del(request);
999
1000	return list_entry(request, struct crypto_async_request, list);
1001}
1002EXPORT_SYMBOL_GPL(crypto_dequeue_request);
1003
1004static inline void crypto_inc_byte(u8 *a, unsigned int size)
1005{
1006	u8 *b = (a + size);
1007	u8 c;
1008
1009	for (; size; size--) {
1010		c = *--b + 1;
1011		*b = c;
1012		if (c)
1013			break;
1014	}
1015}
1016
1017void crypto_inc(u8 *a, unsigned int size)
1018{
1019	__be32 *b = (__be32 *)(a + size);
1020	u32 c;
1021
1022	if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1023	    IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1024		for (; size >= 4; size -= 4) {
1025			c = be32_to_cpu(*--b) + 1;
1026			*b = cpu_to_be32(c);
1027			if (likely(c))
1028				return;
1029		}
1030
1031	crypto_inc_byte(a, size);
1032}
1033EXPORT_SYMBOL_GPL(crypto_inc);
1034
1035unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1036{
1037	return alg->cra_ctxsize +
1038	       (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1039}
1040EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1041
1042int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1043			u32 type, u32 mask)
1044{
1045	int ret = 0;
1046	struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1047
1048	if (!IS_ERR(alg)) {
1049		crypto_mod_put(alg);
1050		ret = 1;
1051	}
1052
1053	return ret;
1054}
1055EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1056
1057static void __init crypto_start_tests(void)
1058{
1059	if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1060		return;
1061
1062	for (;;) {
1063		struct crypto_larval *larval = NULL;
1064		struct crypto_alg *q;
1065
1066		down_write(&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
1098static int __init crypto_algapi_init(void)
1099{
1100	crypto_init_proc();
1101	crypto_start_tests();
1102	return 0;
1103}
1104
1105static void __exit crypto_algapi_exit(void)
1106{
1107	crypto_exit_proc();
1108}
1109
1110/*
1111 * We run this at late_initcall so that all the built-in algorithms
1112 * have had a chance to register themselves first.
1113 */
1114late_initcall(crypto_algapi_init);
1115module_exit(crypto_algapi_exit);
1116
1117MODULE_LICENSE("GPL");
1118MODULE_DESCRIPTION("Cryptographic algorithms API");
1119MODULE_SOFTDEP("pre: cryptomgr");
1120