forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathalgapi.c
1294 lines (1043 loc) · 29.3 KB
/
algapi.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Cryptographic API for algorithms (i.e., low-level API).
*
* Copyright (c) 2006 Herbert Xu <[email protected]>
*/
#include <crypto/algapi.h>
#include <crypto/internal/simd.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/fips.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "internal.h"
static LIST_HEAD(crypto_template_list);
#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
#endif
static inline void crypto_check_module_sig(struct module *mod)
{
if (fips_enabled && mod && !module_sig_ok(mod))
panic("Module %s signature verification failed in FIPS mode\n",
module_name(mod));
}
static int crypto_check_alg(struct crypto_alg *alg)
{
crypto_check_module_sig(alg->cra_module);
if (!alg->cra_name[0] || !alg->cra_driver_name[0])
return -EINVAL;
if (alg->cra_alignmask & (alg->cra_alignmask + 1))
return -EINVAL;
/* General maximums for all algs. */
if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
return -EINVAL;
if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
return -EINVAL;
/* Lower maximums for specific alg types. */
if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
CRYPTO_ALG_TYPE_CIPHER) {
if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
return -EINVAL;
if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
return -EINVAL;
}
if (alg->cra_priority < 0)
return -EINVAL;
refcount_set(&alg->cra_refcnt, 1);
return 0;
}
static void crypto_free_instance(struct crypto_instance *inst)
{
inst->alg.cra_type->free(inst);
}
static void crypto_destroy_instance(struct crypto_alg *alg)
{
struct crypto_instance *inst = (void *)alg;
struct crypto_template *tmpl = inst->tmpl;
crypto_free_instance(inst);
crypto_tmpl_put(tmpl);
}
/*
* This function adds a spawn to the list secondary_spawns which
* will be used at the end of crypto_remove_spawns to unregister
* instances, unless the spawn happens to be one that is depended
* on by the new algorithm (nalg in crypto_remove_spawns).
*
* This function is also responsible for resurrecting any algorithms
* in the dependency chain of nalg by unsetting n->dead.
*/
static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
struct list_head *stack,
struct list_head *top,
struct list_head *secondary_spawns)
{
struct crypto_spawn *spawn, *n;
spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
if (!spawn)
return NULL;
n = list_prev_entry(spawn, list);
list_move(&spawn->list, secondary_spawns);
if (list_is_last(&n->list, stack))
return top;
n = list_next_entry(n, list);
if (!spawn->dead)
n->dead = false;
return &n->inst->alg.cra_users;
}
static void crypto_remove_instance(struct crypto_instance *inst,
struct list_head *list)
{
struct crypto_template *tmpl = inst->tmpl;
if (crypto_is_dead(&inst->alg))
return;
inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
if (!tmpl || !crypto_tmpl_get(tmpl))
return;
list_move(&inst->alg.cra_list, list);
hlist_del(&inst->list);
inst->alg.cra_destroy = crypto_destroy_instance;
BUG_ON(!list_empty(&inst->alg.cra_users));
}
/*
* Given an algorithm alg, remove all algorithms that depend on it
* through spawns. If nalg is not null, then exempt any algorithms
* that is depended on by nalg. This is useful when nalg itself
* depends on alg.
*/
void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
struct crypto_alg *nalg)
{
u32 new_type = (nalg ?: alg)->cra_flags;
struct crypto_spawn *spawn, *n;
LIST_HEAD(secondary_spawns);
struct list_head *spawns;
LIST_HEAD(stack);
LIST_HEAD(top);
spawns = &alg->cra_users;
list_for_each_entry_safe(spawn, n, spawns, list) {
if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
continue;
list_move(&spawn->list, &top);
}
/*
* Perform a depth-first walk starting from alg through
* the cra_users tree. The list stack records the path
* from alg to the current spawn.
*/
spawns = ⊤
do {
while (!list_empty(spawns)) {
struct crypto_instance *inst;
spawn = list_first_entry(spawns, struct crypto_spawn,
list);
inst = spawn->inst;
list_move(&spawn->list, &stack);
spawn->dead = !spawn->registered || &inst->alg != nalg;
if (!spawn->registered)
break;
BUG_ON(&inst->alg == alg);
if (&inst->alg == nalg)
break;
spawns = &inst->alg.cra_users;
/*
* Even if spawn->registered is true, the
* instance itself may still be unregistered.
* This is because it may have failed during
* registration. Therefore we still need to
* make the following test.
*
* We may encounter an unregistered instance here, since
* an instance's spawns are set up prior to the instance
* being registered. An unregistered instance will have
* NULL ->cra_users.next, since ->cra_users isn't
* properly initialized until registration. But an
* unregistered instance cannot have any users, so treat
* it the same as ->cra_users being empty.
*/
if (spawns->next == NULL)
break;
}
} while ((spawns = crypto_more_spawns(alg, &stack, &top,
&secondary_spawns)));
/*
* Remove all instances that are marked as dead. Also
* complete the resurrection of the others by moving them
* back to the cra_users list.
*/
list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
if (!spawn->dead)
list_move(&spawn->list, &spawn->alg->cra_users);
else if (spawn->registered)
crypto_remove_instance(spawn->inst, list);
}
}
EXPORT_SYMBOL_GPL(crypto_remove_spawns);
static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
{
struct crypto_larval *larval;
if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER))
return NULL;
larval = crypto_larval_alloc(alg->cra_name,
alg->cra_flags | CRYPTO_ALG_TESTED, 0);
if (IS_ERR(larval))
return larval;
larval->adult = crypto_mod_get(alg);
if (!larval->adult) {
kfree(larval);
return ERR_PTR(-ENOENT);
}
refcount_set(&larval->alg.cra_refcnt, 1);
memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
CRYPTO_MAX_ALG_NAME);
larval->alg.cra_priority = alg->cra_priority;
return larval;
}
static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
{
struct crypto_alg *q;
struct crypto_larval *larval;
int ret = -EAGAIN;
if (crypto_is_dead(alg))
goto err;
INIT_LIST_HEAD(&alg->cra_users);
/* No cheating! */
alg->cra_flags &= ~CRYPTO_ALG_TESTED;
ret = -EEXIST;
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (q == alg)
goto err;
if (crypto_is_moribund(q))
continue;
if (crypto_is_larval(q)) {
if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
goto err;
continue;
}
if (!strcmp(q->cra_driver_name, alg->cra_name) ||
!strcmp(q->cra_name, alg->cra_driver_name))
goto err;
}
larval = crypto_alloc_test_larval(alg);
if (IS_ERR(larval))
goto out;
list_add(&alg->cra_list, &crypto_alg_list);
if (larval)
list_add(&larval->alg.cra_list, &crypto_alg_list);
else
alg->cra_flags |= CRYPTO_ALG_TESTED;
crypto_stats_init(alg);
out:
return larval;
err:
larval = ERR_PTR(ret);
goto out;
}
void crypto_alg_tested(const char *name, int err)
{
struct crypto_larval *test;
struct crypto_alg *alg;
struct crypto_alg *q;
LIST_HEAD(list);
bool best;
down_write(&crypto_alg_sem);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (crypto_is_moribund(q) || !crypto_is_larval(q))
continue;
test = (struct crypto_larval *)q;
if (!strcmp(q->cra_driver_name, name))
goto found;
}
pr_err("alg: Unexpected test result for %s: %d\n", name, err);
goto unlock;
found:
q->cra_flags |= CRYPTO_ALG_DEAD;
alg = test->adult;
if (list_empty(&alg->cra_list))
goto complete;
if (err == -ECANCELED)
alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
else if (err)
goto complete;
else
alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
alg->cra_flags |= CRYPTO_ALG_TESTED;
/* Only satisfy larval waiters if we are the best. */
best = true;
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (crypto_is_moribund(q) || !crypto_is_larval(q))
continue;
if (strcmp(alg->cra_name, q->cra_name))
continue;
if (q->cra_priority > alg->cra_priority) {
best = false;
break;
}
}
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (q == alg)
continue;
if (crypto_is_moribund(q))
continue;
if (crypto_is_larval(q)) {
struct crypto_larval *larval = (void *)q;
/*
* Check to see if either our generic name or
* specific name can satisfy the name requested
* by the larval entry q.
*/
if (strcmp(alg->cra_name, q->cra_name) &&
strcmp(alg->cra_driver_name, q->cra_name))
continue;
if (larval->adult)
continue;
if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
continue;
if (best && crypto_mod_get(alg))
larval->adult = alg;
else
larval->adult = ERR_PTR(-EAGAIN);
continue;
}
if (strcmp(alg->cra_name, q->cra_name))
continue;
if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
q->cra_priority > alg->cra_priority)
continue;
crypto_remove_spawns(q, &list, alg);
}
complete:
complete_all(&test->completion);
unlock:
up_write(&crypto_alg_sem);
crypto_remove_final(&list);
}
EXPORT_SYMBOL_GPL(crypto_alg_tested);
void crypto_remove_final(struct list_head *list)
{
struct crypto_alg *alg;
struct crypto_alg *n;
list_for_each_entry_safe(alg, n, list, cra_list) {
list_del_init(&alg->cra_list);
crypto_alg_put(alg);
}
}
EXPORT_SYMBOL_GPL(crypto_remove_final);
int crypto_register_alg(struct crypto_alg *alg)
{
struct crypto_larval *larval;
bool test_started;
int err;
alg->cra_flags &= ~CRYPTO_ALG_DEAD;
err = crypto_check_alg(alg);
if (err)
return err;
down_write(&crypto_alg_sem);
larval = __crypto_register_alg(alg);
test_started = static_key_enabled(&crypto_boot_test_finished);
if (!IS_ERR_OR_NULL(larval))
larval->test_started = test_started;
up_write(&crypto_alg_sem);
if (IS_ERR_OR_NULL(larval))
return PTR_ERR(larval);
if (test_started)
crypto_wait_for_test(larval);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_register_alg);
static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
{
if (unlikely(list_empty(&alg->cra_list)))
return -ENOENT;
alg->cra_flags |= CRYPTO_ALG_DEAD;
list_del_init(&alg->cra_list);
crypto_remove_spawns(alg, list, NULL);
return 0;
}
void crypto_unregister_alg(struct crypto_alg *alg)
{
int ret;
LIST_HEAD(list);
down_write(&crypto_alg_sem);
ret = crypto_remove_alg(alg, &list);
up_write(&crypto_alg_sem);
if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
return;
BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
if (alg->cra_destroy)
alg->cra_destroy(alg);
crypto_remove_final(&list);
}
EXPORT_SYMBOL_GPL(crypto_unregister_alg);
int crypto_register_algs(struct crypto_alg *algs, int count)
{
int i, ret;
for (i = 0; i < count; i++) {
ret = crypto_register_alg(&algs[i]);
if (ret)
goto err;
}
return 0;
err:
for (--i; i >= 0; --i)
crypto_unregister_alg(&algs[i]);
return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_algs);
void crypto_unregister_algs(struct crypto_alg *algs, int count)
{
int i;
for (i = 0; i < count; i++)
crypto_unregister_alg(&algs[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_algs);
int crypto_register_template(struct crypto_template *tmpl)
{
struct crypto_template *q;
int err = -EEXIST;
down_write(&crypto_alg_sem);
crypto_check_module_sig(tmpl->module);
list_for_each_entry(q, &crypto_template_list, list) {
if (q == tmpl)
goto out;
}
list_add(&tmpl->list, &crypto_template_list);
err = 0;
out:
up_write(&crypto_alg_sem);
return err;
}
EXPORT_SYMBOL_GPL(crypto_register_template);
int crypto_register_templates(struct crypto_template *tmpls, int count)
{
int i, err;
for (i = 0; i < count; i++) {
err = crypto_register_template(&tmpls[i]);
if (err)
goto out;
}
return 0;
out:
for (--i; i >= 0; --i)
crypto_unregister_template(&tmpls[i]);
return err;
}
EXPORT_SYMBOL_GPL(crypto_register_templates);
void crypto_unregister_template(struct crypto_template *tmpl)
{
struct crypto_instance *inst;
struct hlist_node *n;
struct hlist_head *list;
LIST_HEAD(users);
down_write(&crypto_alg_sem);
BUG_ON(list_empty(&tmpl->list));
list_del_init(&tmpl->list);
list = &tmpl->instances;
hlist_for_each_entry(inst, list, list) {
int err = crypto_remove_alg(&inst->alg, &users);
BUG_ON(err);
}
up_write(&crypto_alg_sem);
hlist_for_each_entry_safe(inst, n, list, list) {
BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
crypto_free_instance(inst);
}
crypto_remove_final(&users);
}
EXPORT_SYMBOL_GPL(crypto_unregister_template);
void crypto_unregister_templates(struct crypto_template *tmpls, int count)
{
int i;
for (i = count - 1; i >= 0; --i)
crypto_unregister_template(&tmpls[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_templates);
static struct crypto_template *__crypto_lookup_template(const char *name)
{
struct crypto_template *q, *tmpl = NULL;
down_read(&crypto_alg_sem);
list_for_each_entry(q, &crypto_template_list, list) {
if (strcmp(q->name, name))
continue;
if (unlikely(!crypto_tmpl_get(q)))
continue;
tmpl = q;
break;
}
up_read(&crypto_alg_sem);
return tmpl;
}
struct crypto_template *crypto_lookup_template(const char *name)
{
return try_then_request_module(__crypto_lookup_template(name),
"crypto-%s", name);
}
EXPORT_SYMBOL_GPL(crypto_lookup_template);
int crypto_register_instance(struct crypto_template *tmpl,
struct crypto_instance *inst)
{
struct crypto_larval *larval;
struct crypto_spawn *spawn;
u32 fips_internal = 0;
int err;
err = crypto_check_alg(&inst->alg);
if (err)
return err;
inst->alg.cra_module = tmpl->module;
inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
down_write(&crypto_alg_sem);
larval = ERR_PTR(-EAGAIN);
for (spawn = inst->spawns; spawn;) {
struct crypto_spawn *next;
if (spawn->dead)
goto unlock;
next = spawn->next;
spawn->inst = inst;
spawn->registered = true;
fips_internal |= spawn->alg->cra_flags;
crypto_mod_put(spawn->alg);
spawn = next;
}
inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
larval = __crypto_register_alg(&inst->alg);
if (IS_ERR(larval))
goto unlock;
else if (larval)
larval->test_started = true;
hlist_add_head(&inst->list, &tmpl->instances);
inst->tmpl = tmpl;
unlock:
up_write(&crypto_alg_sem);
err = PTR_ERR(larval);
if (IS_ERR_OR_NULL(larval))
goto err;
crypto_wait_for_test(larval);
err = 0;
err:
return err;
}
EXPORT_SYMBOL_GPL(crypto_register_instance);
void crypto_unregister_instance(struct crypto_instance *inst)
{
LIST_HEAD(list);
down_write(&crypto_alg_sem);
crypto_remove_spawns(&inst->alg, &list, NULL);
crypto_remove_instance(inst, &list);
up_write(&crypto_alg_sem);
crypto_remove_final(&list);
}
EXPORT_SYMBOL_GPL(crypto_unregister_instance);
int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
const char *name, u32 type, u32 mask)
{
struct crypto_alg *alg;
int err = -EAGAIN;
if (WARN_ON_ONCE(inst == NULL))
return -EINVAL;
/* Allow the result of crypto_attr_alg_name() to be passed directly */
if (IS_ERR(name))
return PTR_ERR(name);
alg = crypto_find_alg(name, spawn->frontend,
type | CRYPTO_ALG_FIPS_INTERNAL, mask);
if (IS_ERR(alg))
return PTR_ERR(alg);
down_write(&crypto_alg_sem);
if (!crypto_is_moribund(alg)) {
list_add(&spawn->list, &alg->cra_users);
spawn->alg = alg;
spawn->mask = mask;
spawn->next = inst->spawns;
inst->spawns = spawn;
inst->alg.cra_flags |=
(alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
err = 0;
}
up_write(&crypto_alg_sem);
if (err)
crypto_mod_put(alg);
return err;
}
EXPORT_SYMBOL_GPL(crypto_grab_spawn);
void crypto_drop_spawn(struct crypto_spawn *spawn)
{
if (!spawn->alg) /* not yet initialized? */
return;
down_write(&crypto_alg_sem);
if (!spawn->dead)
list_del(&spawn->list);
up_write(&crypto_alg_sem);
if (!spawn->registered)
crypto_mod_put(spawn->alg);
}
EXPORT_SYMBOL_GPL(crypto_drop_spawn);
static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
{
struct crypto_alg *alg = ERR_PTR(-EAGAIN);
struct crypto_alg *target;
bool shoot = false;
down_read(&crypto_alg_sem);
if (!spawn->dead) {
alg = spawn->alg;
if (!crypto_mod_get(alg)) {
target = crypto_alg_get(alg);
shoot = true;
alg = ERR_PTR(-EAGAIN);
}
}
up_read(&crypto_alg_sem);
if (shoot) {
crypto_shoot_alg(target);
crypto_alg_put(target);
}
return alg;
}
struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
u32 mask)
{
struct crypto_alg *alg;
struct crypto_tfm *tfm;
alg = crypto_spawn_alg(spawn);
if (IS_ERR(alg))
return ERR_CAST(alg);
tfm = ERR_PTR(-EINVAL);
if (unlikely((alg->cra_flags ^ type) & mask))
goto out_put_alg;
tfm = __crypto_alloc_tfm(alg, type, mask);
if (IS_ERR(tfm))
goto out_put_alg;
return tfm;
out_put_alg:
crypto_mod_put(alg);
return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
{
struct crypto_alg *alg;
struct crypto_tfm *tfm;
alg = crypto_spawn_alg(spawn);
if (IS_ERR(alg))
return ERR_CAST(alg);
tfm = crypto_create_tfm(alg, spawn->frontend);
if (IS_ERR(tfm))
goto out_put_alg;
return tfm;
out_put_alg:
crypto_mod_put(alg);
return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
int crypto_register_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&crypto_chain, nb);
}
EXPORT_SYMBOL_GPL(crypto_register_notifier);
int crypto_unregister_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&crypto_chain, nb);
}
EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
{
struct rtattr *rta = tb[0];
struct crypto_attr_type *algt;
if (!rta)
return ERR_PTR(-ENOENT);
if (RTA_PAYLOAD(rta) < sizeof(*algt))
return ERR_PTR(-EINVAL);
if (rta->rta_type != CRYPTOA_TYPE)
return ERR_PTR(-EINVAL);
algt = RTA_DATA(rta);
return algt;
}
EXPORT_SYMBOL_GPL(crypto_get_attr_type);
/**
* crypto_check_attr_type() - check algorithm type and compute inherited mask
* @tb: the template parameters
* @type: the algorithm type the template would be instantiated as
* @mask_ret: (output) the mask that should be passed to crypto_grab_*()
* to restrict the flags of any inner algorithms
*
* Validate that the algorithm type the user requested is compatible with the
* one the template would actually be instantiated as. E.g., if the user is
* doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
* the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
*
* Also compute the mask to use to restrict the flags of any inner algorithms.
*
* Return: 0 on success; -errno on failure
*/
int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
{
struct crypto_attr_type *algt;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return PTR_ERR(algt);
if ((algt->type ^ type) & algt->mask)
return -EINVAL;
*mask_ret = crypto_algt_inherited_mask(algt);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_check_attr_type);
const char *crypto_attr_alg_name(struct rtattr *rta)
{
struct crypto_attr_alg *alga;
if (!rta)
return ERR_PTR(-ENOENT);
if (RTA_PAYLOAD(rta) < sizeof(*alga))
return ERR_PTR(-EINVAL);
if (rta->rta_type != CRYPTOA_ALG)
return ERR_PTR(-EINVAL);
alga = RTA_DATA(rta);
alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
return alga->name;
}
EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
int crypto_inst_setname(struct crypto_instance *inst, const char *name,
struct crypto_alg *alg)
{
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
return 0;
}
EXPORT_SYMBOL_GPL(crypto_inst_setname);
void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
{
INIT_LIST_HEAD(&queue->list);
queue->backlog = &queue->list;
queue->qlen = 0;
queue->max_qlen = max_qlen;
}
EXPORT_SYMBOL_GPL(crypto_init_queue);
int crypto_enqueue_request(struct crypto_queue *queue,
struct crypto_async_request *request)
{
int err = -EINPROGRESS;
if (unlikely(queue->qlen >= queue->max_qlen)) {
if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
err = -ENOSPC;
goto out;
}
err = -EBUSY;
if (queue->backlog == &queue->list)
queue->backlog = &request->list;
}
queue->qlen++;
list_add_tail(&request->list, &queue->list);
out:
return err;
}
EXPORT_SYMBOL_GPL(crypto_enqueue_request);
void crypto_enqueue_request_head(struct crypto_queue *queue,
struct crypto_async_request *request)
{
queue->qlen++;
list_add(&request->list, &queue->list);
}
EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
{
struct list_head *request;
if (unlikely(!queue->qlen))
return NULL;
queue->qlen--;
if (queue->backlog != &queue->list)
queue->backlog = queue->backlog->next;
request = queue->list.next;
list_del(request);
return list_entry(request, struct crypto_async_request, list);
}
EXPORT_SYMBOL_GPL(crypto_dequeue_request);
static inline void crypto_inc_byte(u8 *a, unsigned int size)
{
u8 *b = (a + size);
u8 c;
for (; size; size--) {
c = *--b + 1;
*b = c;
if (c)
break;
}
}
void crypto_inc(u8 *a, unsigned int size)
{
__be32 *b = (__be32 *)(a + size);
u32 c;
if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
IS_ALIGNED((unsigned long)b, __alignof__(*b)))
for (; size >= 4; size -= 4) {
c = be32_to_cpu(*--b) + 1;
*b = cpu_to_be32(c);
if (likely(c))
return;
}
crypto_inc_byte(a, size);
}
EXPORT_SYMBOL_GPL(crypto_inc);
unsigned int crypto_alg_extsize(struct crypto_alg *alg)