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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * pkey device driver
4 *
5 * Copyright IBM Corp. 2017,2019
6 * Author(s): Harald Freudenberger
7 */
8
9#define KMSG_COMPONENT "pkey"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/fs.h>
13#include <linux/init.h>
14#include <linux/miscdevice.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/kallsyms.h>
18#include <linux/debugfs.h>
19#include <linux/random.h>
20#include <linux/cpufeature.h>
21#include <asm/zcrypt.h>
22#include <asm/cpacf.h>
23#include <asm/pkey.h>
24#include <crypto/aes.h>
25
26#include "zcrypt_api.h"
27#include "zcrypt_ccamisc.h"
28
29MODULE_LICENSE("GPL");
30MODULE_AUTHOR("IBM Corporation");
31MODULE_DESCRIPTION("s390 protected key interface");
32
33#define KEYBLOBBUFSIZE 8192 /* key buffer size used for internal processing */
34#define MAXAPQNSINLIST 64 /* max 64 apqns within a apqn list */
35
36/* mask of available pckmo subfunctions, fetched once at module init */
37static cpacf_mask_t pckmo_functions;
38
39/*
40 * debug feature data and functions
41 */
42
43static debug_info_t *debug_info;
44
45#define DEBUG_DBG(...) debug_sprintf_event(debug_info, 6, ##__VA_ARGS__)
46#define DEBUG_INFO(...) debug_sprintf_event(debug_info, 5, ##__VA_ARGS__)
47#define DEBUG_WARN(...) debug_sprintf_event(debug_info, 4, ##__VA_ARGS__)
48#define DEBUG_ERR(...) debug_sprintf_event(debug_info, 3, ##__VA_ARGS__)
49
50static void __init pkey_debug_init(void)
51{
52 /* 5 arguments per dbf entry (including the format string ptr) */
53 debug_info = debug_register("pkey", 1, 1, 5 * sizeof(long));
54 debug_register_view(debug_info, &debug_sprintf_view);
55 debug_set_level(debug_info, 3);
56}
57
58static void __exit pkey_debug_exit(void)
59{
60 debug_unregister(debug_info);
61}
62
63/* inside view of a protected key token (only type 0x00 version 0x01) */
64struct protaeskeytoken {
65 u8 type; /* 0x00 for PAES specific key tokens */
66 u8 res0[3];
67 u8 version; /* should be 0x01 for protected AES key token */
68 u8 res1[3];
69 u32 keytype; /* key type, one of the PKEY_KEYTYPE values */
70 u32 len; /* bytes actually stored in protkey[] */
71 u8 protkey[MAXPROTKEYSIZE]; /* the protected key blob */
72} __packed;
73
74/*
75 * Create a protected key from a clear key value.
76 */
77static int pkey_clr2protkey(u32 keytype,
78 const struct pkey_clrkey *clrkey,
79 struct pkey_protkey *protkey)
80{
81 long fc;
82 int keysize;
83 u8 paramblock[64];
84
85 switch (keytype) {
86 case PKEY_KEYTYPE_AES_128:
87 keysize = 16;
88 fc = CPACF_PCKMO_ENC_AES_128_KEY;
89 break;
90 case PKEY_KEYTYPE_AES_192:
91 keysize = 24;
92 fc = CPACF_PCKMO_ENC_AES_192_KEY;
93 break;
94 case PKEY_KEYTYPE_AES_256:
95 keysize = 32;
96 fc = CPACF_PCKMO_ENC_AES_256_KEY;
97 break;
98 default:
99 DEBUG_ERR("%s unknown/unsupported keytype %d\n",
100 __func__, keytype);
101 return -EINVAL;
102 }
103
104 /*
105 * Check if the needed pckmo subfunction is available.
106 * These subfunctions can be enabled/disabled by customers
107 * in the LPAR profile or may even change on the fly.
108 */
109 if (!cpacf_test_func(&pckmo_functions, fc)) {
110 DEBUG_ERR("%s pckmo functions not available\n", __func__);
111 return -ENODEV;
112 }
113
114 /* prepare param block */
115 memset(paramblock, 0, sizeof(paramblock));
116 memcpy(paramblock, clrkey->clrkey, keysize);
117
118 /* call the pckmo instruction */
119 cpacf_pckmo(fc, paramblock);
120
121 /* copy created protected key */
122 protkey->type = keytype;
123 protkey->len = keysize + 32;
124 memcpy(protkey->protkey, paramblock, keysize + 32);
125
126 return 0;
127}
128
129/*
130 * Find card and transform secure key into protected key.
131 */
132static int pkey_skey2pkey(const u8 *key, struct pkey_protkey *pkey)
133{
134 int rc, verify;
135 u16 cardnr, domain;
136 struct keytoken_header *hdr = (struct keytoken_header *)key;
137
138 /*
139 * The cca_xxx2protkey call may fail when a card has been
140 * addressed where the master key was changed after last fetch
141 * of the mkvp into the cache. Try 3 times: First witout verify
142 * then with verify and last round with verify and old master
143 * key verification pattern match not ignored.
144 */
145 for (verify = 0; verify < 3; verify++) {
146 rc = cca_findcard(key, &cardnr, &domain, verify);
147 if (rc < 0)
148 continue;
149 if (rc > 0 && verify < 2)
150 continue;
151 switch (hdr->version) {
152 case TOKVER_CCA_AES:
153 rc = cca_sec2protkey(cardnr, domain,
154 key, pkey->protkey,
155 &pkey->len, &pkey->type);
156 break;
157 case TOKVER_CCA_VLSC:
158 rc = cca_cipher2protkey(cardnr, domain,
159 key, pkey->protkey,
160 &pkey->len, &pkey->type);
161 break;
162 default:
163 return -EINVAL;
164 }
165 if (rc == 0)
166 break;
167 }
168
169 if (rc)
170 DEBUG_DBG("%s failed rc=%d\n", __func__, rc);
171
172 return rc;
173}
174
175/*
176 * Verify key and give back some info about the key.
177 */
178static int pkey_verifykey(const struct pkey_seckey *seckey,
179 u16 *pcardnr, u16 *pdomain,
180 u16 *pkeysize, u32 *pattributes)
181{
182 struct secaeskeytoken *t = (struct secaeskeytoken *) seckey;
183 u16 cardnr, domain;
184 int rc;
185
186 /* check the secure key for valid AES secure key */
187 rc = cca_check_secaeskeytoken(debug_info, 3, (u8 *) seckey, 0);
188 if (rc)
189 goto out;
190 if (pattributes)
191 *pattributes = PKEY_VERIFY_ATTR_AES;
192 if (pkeysize)
193 *pkeysize = t->bitsize;
194
195 /* try to find a card which can handle this key */
196 rc = cca_findcard(seckey->seckey, &cardnr, &domain, 1);
197 if (rc < 0)
198 goto out;
199
200 if (rc > 0) {
201 /* key mkvp matches to old master key mkvp */
202 DEBUG_DBG("%s secure key has old mkvp\n", __func__);
203 if (pattributes)
204 *pattributes |= PKEY_VERIFY_ATTR_OLD_MKVP;
205 rc = 0;
206 }
207
208 if (pcardnr)
209 *pcardnr = cardnr;
210 if (pdomain)
211 *pdomain = domain;
212
213out:
214 DEBUG_DBG("%s rc=%d\n", __func__, rc);
215 return rc;
216}
217
218/*
219 * Generate a random protected key
220 */
221static int pkey_genprotkey(u32 keytype, struct pkey_protkey *protkey)
222{
223 struct pkey_clrkey clrkey;
224 int keysize;
225 int rc;
226
227 switch (keytype) {
228 case PKEY_KEYTYPE_AES_128:
229 keysize = 16;
230 break;
231 case PKEY_KEYTYPE_AES_192:
232 keysize = 24;
233 break;
234 case PKEY_KEYTYPE_AES_256:
235 keysize = 32;
236 break;
237 default:
238 DEBUG_ERR("%s unknown/unsupported keytype %d\n", __func__,
239 keytype);
240 return -EINVAL;
241 }
242
243 /* generate a dummy random clear key */
244 get_random_bytes(clrkey.clrkey, keysize);
245
246 /* convert it to a dummy protected key */
247 rc = pkey_clr2protkey(keytype, &clrkey, protkey);
248 if (rc)
249 return rc;
250
251 /* replace the key part of the protected key with random bytes */
252 get_random_bytes(protkey->protkey, keysize);
253
254 return 0;
255}
256
257/*
258 * Verify if a protected key is still valid
259 */
260static int pkey_verifyprotkey(const struct pkey_protkey *protkey)
261{
262 unsigned long fc;
263 struct {
264 u8 iv[AES_BLOCK_SIZE];
265 u8 key[MAXPROTKEYSIZE];
266 } param;
267 u8 null_msg[AES_BLOCK_SIZE];
268 u8 dest_buf[AES_BLOCK_SIZE];
269 unsigned int k;
270
271 switch (protkey->type) {
272 case PKEY_KEYTYPE_AES_128:
273 fc = CPACF_KMC_PAES_128;
274 break;
275 case PKEY_KEYTYPE_AES_192:
276 fc = CPACF_KMC_PAES_192;
277 break;
278 case PKEY_KEYTYPE_AES_256:
279 fc = CPACF_KMC_PAES_256;
280 break;
281 default:
282 DEBUG_ERR("%s unknown/unsupported keytype %d\n", __func__,
283 protkey->type);
284 return -EINVAL;
285 }
286
287 memset(null_msg, 0, sizeof(null_msg));
288
289 memset(param.iv, 0, sizeof(param.iv));
290 memcpy(param.key, protkey->protkey, sizeof(param.key));
291
292 k = cpacf_kmc(fc | CPACF_ENCRYPT, ¶m, null_msg, dest_buf,
293 sizeof(null_msg));
294 if (k != sizeof(null_msg)) {
295 DEBUG_ERR("%s protected key is not valid\n", __func__);
296 return -EKEYREJECTED;
297 }
298
299 return 0;
300}
301
302/*
303 * Transform a non-CCA key token into a protected key
304 */
305static int pkey_nonccatok2pkey(const u8 *key, u32 keylen,
306 struct pkey_protkey *protkey)
307{
308 struct keytoken_header *hdr = (struct keytoken_header *)key;
309 struct protaeskeytoken *t;
310
311 switch (hdr->version) {
312 case TOKVER_PROTECTED_KEY:
313 if (keylen != sizeof(struct protaeskeytoken))
314 return -EINVAL;
315
316 t = (struct protaeskeytoken *)key;
317 protkey->len = t->len;
318 protkey->type = t->keytype;
319 memcpy(protkey->protkey, t->protkey,
320 sizeof(protkey->protkey));
321
322 return pkey_verifyprotkey(protkey);
323 default:
324 DEBUG_ERR("%s unknown/unsupported non-CCA token version %d\n",
325 __func__, hdr->version);
326 return -EINVAL;
327 }
328}
329
330/*
331 * Transform a CCA internal key token into a protected key
332 */
333static int pkey_ccainttok2pkey(const u8 *key, u32 keylen,
334 struct pkey_protkey *protkey)
335{
336 struct keytoken_header *hdr = (struct keytoken_header *)key;
337
338 switch (hdr->version) {
339 case TOKVER_CCA_AES:
340 if (keylen != sizeof(struct secaeskeytoken))
341 return -EINVAL;
342 break;
343 case TOKVER_CCA_VLSC:
344 if (keylen < hdr->len || keylen > MAXCCAVLSCTOKENSIZE)
345 return -EINVAL;
346 break;
347 default:
348 DEBUG_ERR("%s unknown/unsupported CCA internal token version %d\n",
349 __func__, hdr->version);
350 return -EINVAL;
351 }
352
353 return pkey_skey2pkey(key, protkey);
354}
355
356/*
357 * Transform a key blob (of any type) into a protected key
358 */
359int pkey_keyblob2pkey(const u8 *key, u32 keylen,
360 struct pkey_protkey *protkey)
361{
362 int rc;
363 struct keytoken_header *hdr = (struct keytoken_header *)key;
364
365 if (keylen < sizeof(struct keytoken_header)) {
366 DEBUG_ERR("%s invalid keylen %d\n", __func__, keylen);
367 return -EINVAL;
368 }
369
370 switch (hdr->type) {
371 case TOKTYPE_NON_CCA:
372 rc = pkey_nonccatok2pkey(key, keylen, protkey);
373 break;
374 case TOKTYPE_CCA_INTERNAL:
375 rc = pkey_ccainttok2pkey(key, keylen, protkey);
376 break;
377 default:
378 DEBUG_ERR("%s unknown/unsupported blob type %d\n",
379 __func__, hdr->type);
380 return -EINVAL;
381 }
382
383 DEBUG_DBG("%s rc=%d\n", __func__, rc);
384 return rc;
385
386}
387EXPORT_SYMBOL(pkey_keyblob2pkey);
388
389static int pkey_genseckey2(const struct pkey_apqn *apqns, size_t nr_apqns,
390 enum pkey_key_type ktype, enum pkey_key_size ksize,
391 u32 kflags, u8 *keybuf, size_t *keybufsize)
392{
393 int i, card, dom, rc;
394
395 /* check for at least one apqn given */
396 if (!apqns || !nr_apqns)
397 return -EINVAL;
398
399 /* check key type and size */
400 switch (ktype) {
401 case PKEY_TYPE_CCA_DATA:
402 case PKEY_TYPE_CCA_CIPHER:
403 if (*keybufsize < SECKEYBLOBSIZE)
404 return -EINVAL;
405 break;
406 default:
407 return -EINVAL;
408 }
409 switch (ksize) {
410 case PKEY_SIZE_AES_128:
411 case PKEY_SIZE_AES_192:
412 case PKEY_SIZE_AES_256:
413 break;
414 default:
415 return -EINVAL;
416 }
417
418 /* simple try all apqns from the list */
419 for (i = 0, rc = -ENODEV; i < nr_apqns; i++) {
420 card = apqns[i].card;
421 dom = apqns[i].domain;
422 if (ktype == PKEY_TYPE_CCA_DATA) {
423 rc = cca_genseckey(card, dom, ksize, keybuf);
424 *keybufsize = (rc ? 0 : SECKEYBLOBSIZE);
425 } else /* TOKVER_CCA_VLSC */
426 rc = cca_gencipherkey(card, dom, ksize, kflags,
427 keybuf, keybufsize);
428 if (rc == 0)
429 break;
430 }
431
432 return rc;
433}
434
435static int pkey_clr2seckey2(const struct pkey_apqn *apqns, size_t nr_apqns,
436 enum pkey_key_type ktype, enum pkey_key_size ksize,
437 u32 kflags, const u8 *clrkey,
438 u8 *keybuf, size_t *keybufsize)
439{
440 int i, card, dom, rc;
441
442 /* check for at least one apqn given */
443 if (!apqns || !nr_apqns)
444 return -EINVAL;
445
446 /* check key type and size */
447 switch (ktype) {
448 case PKEY_TYPE_CCA_DATA:
449 case PKEY_TYPE_CCA_CIPHER:
450 if (*keybufsize < SECKEYBLOBSIZE)
451 return -EINVAL;
452 break;
453 default:
454 return -EINVAL;
455 }
456 switch (ksize) {
457 case PKEY_SIZE_AES_128:
458 case PKEY_SIZE_AES_192:
459 case PKEY_SIZE_AES_256:
460 break;
461 default:
462 return -EINVAL;
463 }
464
465 /* simple try all apqns from the list */
466 for (i = 0, rc = -ENODEV; i < nr_apqns; i++) {
467 card = apqns[i].card;
468 dom = apqns[i].domain;
469 if (ktype == PKEY_TYPE_CCA_DATA) {
470 rc = cca_clr2seckey(card, dom, ksize,
471 clrkey, keybuf);
472 *keybufsize = (rc ? 0 : SECKEYBLOBSIZE);
473 } else /* TOKVER_CCA_VLSC */
474 rc = cca_clr2cipherkey(card, dom, ksize, kflags,
475 clrkey, keybuf, keybufsize);
476 if (rc == 0)
477 break;
478 }
479
480 return rc;
481}
482
483static int pkey_verifykey2(const u8 *key, size_t keylen,
484 u16 *cardnr, u16 *domain,
485 enum pkey_key_type *ktype,
486 enum pkey_key_size *ksize, u32 *flags)
487{
488 int rc;
489 u32 _nr_apqns, *_apqns = NULL;
490 struct keytoken_header *hdr = (struct keytoken_header *)key;
491
492 if (keylen < sizeof(struct keytoken_header) ||
493 hdr->type != TOKTYPE_CCA_INTERNAL)
494 return -EINVAL;
495
496 if (hdr->version == TOKVER_CCA_AES) {
497 struct secaeskeytoken *t = (struct secaeskeytoken *)key;
498
499 rc = cca_check_secaeskeytoken(debug_info, 3, key, 0);
500 if (rc)
501 goto out;
502 if (ktype)
503 *ktype = PKEY_TYPE_CCA_DATA;
504 if (ksize)
505 *ksize = (enum pkey_key_size) t->bitsize;
506
507 rc = cca_findcard2(&_apqns, &_nr_apqns, *cardnr, *domain,
508 ZCRYPT_CEX3C, t->mkvp, 0, 1);
509 if (rc == 0 && flags)
510 *flags = PKEY_FLAGS_MATCH_CUR_MKVP;
511 if (rc == -ENODEV) {
512 rc = cca_findcard2(&_apqns, &_nr_apqns,
513 *cardnr, *domain,
514 ZCRYPT_CEX3C, 0, t->mkvp, 1);
515 if (rc == 0 && flags)
516 *flags = PKEY_FLAGS_MATCH_ALT_MKVP;
517 }
518 if (rc)
519 goto out;
520
521 *cardnr = ((struct pkey_apqn *)_apqns)->card;
522 *domain = ((struct pkey_apqn *)_apqns)->domain;
523
524 } else if (hdr->version == TOKVER_CCA_VLSC) {
525 struct cipherkeytoken *t = (struct cipherkeytoken *)key;
526
527 rc = cca_check_secaescipherkey(debug_info, 3, key, 0, 1);
528 if (rc)
529 goto out;
530 if (ktype)
531 *ktype = PKEY_TYPE_CCA_CIPHER;
532 if (ksize) {
533 *ksize = PKEY_SIZE_UNKNOWN;
534 if (!t->plfver && t->wpllen == 512)
535 *ksize = PKEY_SIZE_AES_128;
536 else if (!t->plfver && t->wpllen == 576)
537 *ksize = PKEY_SIZE_AES_192;
538 else if (!t->plfver && t->wpllen == 640)
539 *ksize = PKEY_SIZE_AES_256;
540 }
541
542 rc = cca_findcard2(&_apqns, &_nr_apqns, *cardnr, *domain,
543 ZCRYPT_CEX6, t->mkvp0, 0, 1);
544 if (rc == 0 && flags)
545 *flags = PKEY_FLAGS_MATCH_CUR_MKVP;
546 if (rc == -ENODEV) {
547 rc = cca_findcard2(&_apqns, &_nr_apqns,
548 *cardnr, *domain,
549 ZCRYPT_CEX6, 0, t->mkvp0, 1);
550 if (rc == 0 && flags)
551 *flags = PKEY_FLAGS_MATCH_ALT_MKVP;
552 }
553 if (rc)
554 goto out;
555
556 *cardnr = ((struct pkey_apqn *)_apqns)->card;
557 *domain = ((struct pkey_apqn *)_apqns)->domain;
558
559 } else
560 rc = -EINVAL;
561
562out:
563 kfree(_apqns);
564 return rc;
565}
566
567static int pkey_keyblob2pkey2(const struct pkey_apqn *apqns, size_t nr_apqns,
568 const u8 *key, size_t keylen,
569 struct pkey_protkey *pkey)
570{
571 int i, card, dom, rc;
572 struct keytoken_header *hdr = (struct keytoken_header *)key;
573
574 /* check for at least one apqn given */
575 if (!apqns || !nr_apqns)
576 return -EINVAL;
577
578 if (keylen < sizeof(struct keytoken_header))
579 return -EINVAL;
580
581 switch (hdr->type) {
582 case TOKTYPE_NON_CCA:
583 return pkey_nonccatok2pkey(key, keylen, pkey);
584 case TOKTYPE_CCA_INTERNAL:
585 switch (hdr->version) {
586 case TOKVER_CCA_AES:
587 if (keylen != sizeof(struct secaeskeytoken))
588 return -EINVAL;
589 if (cca_check_secaeskeytoken(debug_info, 3, key, 0))
590 return -EINVAL;
591 break;
592 case TOKVER_CCA_VLSC:
593 if (keylen < hdr->len || keylen > MAXCCAVLSCTOKENSIZE)
594 return -EINVAL;
595 if (cca_check_secaescipherkey(debug_info, 3, key, 0, 1))
596 return -EINVAL;
597 break;
598 default:
599 DEBUG_ERR("%s unknown CCA internal token version %d\n",
600 __func__, hdr->version);
601 return -EINVAL;
602 }
603 break;
604 default:
605 DEBUG_ERR("%s unknown/unsupported blob type %d\n",
606 __func__, hdr->type);
607 return -EINVAL;
608 }
609
610 /* simple try all apqns from the list */
611 for (i = 0, rc = -ENODEV; i < nr_apqns; i++) {
612 card = apqns[i].card;
613 dom = apqns[i].domain;
614 if (hdr->version == TOKVER_CCA_AES)
615 rc = cca_sec2protkey(card, dom, key, pkey->protkey,
616 &pkey->len, &pkey->type);
617 else /* TOKVER_CCA_VLSC */
618 rc = cca_cipher2protkey(card, dom, key, pkey->protkey,
619 &pkey->len, &pkey->type);
620 if (rc == 0)
621 break;
622 }
623
624 return rc;
625}
626
627static int pkey_apqns4key(const u8 *key, size_t keylen, u32 flags,
628 struct pkey_apqn *apqns, size_t *nr_apqns)
629{
630 int rc = EINVAL;
631 u32 _nr_apqns, *_apqns = NULL;
632 struct keytoken_header *hdr = (struct keytoken_header *)key;
633
634 if (keylen < sizeof(struct keytoken_header) ||
635 hdr->type != TOKTYPE_CCA_INTERNAL ||
636 flags == 0)
637 return -EINVAL;
638
639 if (hdr->version == TOKVER_CCA_AES || hdr->version == TOKVER_CCA_VLSC) {
640 int minhwtype = ZCRYPT_CEX3C;
641 u64 cur_mkvp = 0, old_mkvp = 0;
642
643 if (hdr->version == TOKVER_CCA_AES) {
644 struct secaeskeytoken *t = (struct secaeskeytoken *)key;
645
646 if (flags & PKEY_FLAGS_MATCH_CUR_MKVP)
647 cur_mkvp = t->mkvp;
648 if (flags & PKEY_FLAGS_MATCH_ALT_MKVP)
649 old_mkvp = t->mkvp;
650 } else {
651 struct cipherkeytoken *t = (struct cipherkeytoken *)key;
652
653 minhwtype = ZCRYPT_CEX6;
654 if (flags & PKEY_FLAGS_MATCH_CUR_MKVP)
655 cur_mkvp = t->mkvp0;
656 if (flags & PKEY_FLAGS_MATCH_ALT_MKVP)
657 old_mkvp = t->mkvp0;
658 }
659 rc = cca_findcard2(&_apqns, &_nr_apqns, 0xFFFF, 0xFFFF,
660 minhwtype, cur_mkvp, old_mkvp, 1);
661 if (rc)
662 goto out;
663 if (apqns) {
664 if (*nr_apqns < _nr_apqns)
665 rc = -ENOSPC;
666 else
667 memcpy(apqns, _apqns, _nr_apqns * sizeof(u32));
668 }
669 *nr_apqns = _nr_apqns;
670 }
671
672out:
673 kfree(_apqns);
674 return rc;
675}
676
677static int pkey_apqns4keytype(enum pkey_key_type ktype,
678 u8 cur_mkvp[32], u8 alt_mkvp[32], u32 flags,
679 struct pkey_apqn *apqns, size_t *nr_apqns)
680{
681 int rc = -EINVAL;
682 u32 _nr_apqns, *_apqns = NULL;
683
684 if (ktype == PKEY_TYPE_CCA_DATA || ktype == PKEY_TYPE_CCA_CIPHER) {
685 u64 cur_mkvp = 0, old_mkvp = 0;
686 int minhwtype = ZCRYPT_CEX3C;
687
688 if (flags & PKEY_FLAGS_MATCH_CUR_MKVP)
689 cur_mkvp = *((u64 *) cur_mkvp);
690 if (flags & PKEY_FLAGS_MATCH_ALT_MKVP)
691 old_mkvp = *((u64 *) alt_mkvp);
692 if (ktype == PKEY_TYPE_CCA_CIPHER)
693 minhwtype = ZCRYPT_CEX6;
694 rc = cca_findcard2(&_apqns, &_nr_apqns, 0xFFFF, 0xFFFF,
695 minhwtype, cur_mkvp, old_mkvp, 1);
696 if (rc)
697 goto out;
698 if (apqns) {
699 if (*nr_apqns < _nr_apqns)
700 rc = -ENOSPC;
701 else
702 memcpy(apqns, _apqns, _nr_apqns * sizeof(u32));
703 }
704 *nr_apqns = _nr_apqns;
705 }
706
707out:
708 kfree(_apqns);
709 return rc;
710}
711
712/*
713 * File io functions
714 */
715
716static void *_copy_key_from_user(void __user *ukey, size_t keylen)
717{
718 void *kkey;
719
720 if (!ukey || keylen < MINKEYBLOBSIZE || keylen > KEYBLOBBUFSIZE)
721 return ERR_PTR(-EINVAL);
722 kkey = kmalloc(keylen, GFP_KERNEL);
723 if (!kkey)
724 return ERR_PTR(-ENOMEM);
725 if (copy_from_user(kkey, ukey, keylen)) {
726 kfree(kkey);
727 return ERR_PTR(-EFAULT);
728 }
729
730 return kkey;
731}
732
733static void *_copy_apqns_from_user(void __user *uapqns, size_t nr_apqns)
734{
735 void *kapqns = NULL;
736 size_t nbytes;
737
738 if (uapqns && nr_apqns > 0) {
739 nbytes = nr_apqns * sizeof(struct pkey_apqn);
740 kapqns = kmalloc(nbytes, GFP_KERNEL);
741 if (!kapqns)
742 return ERR_PTR(-ENOMEM);
743 if (copy_from_user(kapqns, uapqns, nbytes))
744 return ERR_PTR(-EFAULT);
745 }
746
747 return kapqns;
748}
749
750static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd,
751 unsigned long arg)
752{
753 int rc;
754
755 switch (cmd) {
756 case PKEY_GENSECK: {
757 struct pkey_genseck __user *ugs = (void __user *) arg;
758 struct pkey_genseck kgs;
759
760 if (copy_from_user(&kgs, ugs, sizeof(kgs)))
761 return -EFAULT;
762 rc = cca_genseckey(kgs.cardnr, kgs.domain,
763 kgs.keytype, kgs.seckey.seckey);
764 DEBUG_DBG("%s cca_genseckey()=%d\n", __func__, rc);
765 if (rc)
766 break;
767 if (copy_to_user(ugs, &kgs, sizeof(kgs)))
768 return -EFAULT;
769 break;
770 }
771 case PKEY_CLR2SECK: {
772 struct pkey_clr2seck __user *ucs = (void __user *) arg;
773 struct pkey_clr2seck kcs;
774
775 if (copy_from_user(&kcs, ucs, sizeof(kcs)))
776 return -EFAULT;
777 rc = cca_clr2seckey(kcs.cardnr, kcs.domain, kcs.keytype,
778 kcs.clrkey.clrkey, kcs.seckey.seckey);
779 DEBUG_DBG("%s cca_clr2seckey()=%d\n", __func__, rc);
780 if (rc)
781 break;
782 if (copy_to_user(ucs, &kcs, sizeof(kcs)))
783 return -EFAULT;
784 memzero_explicit(&kcs, sizeof(kcs));
785 break;
786 }
787 case PKEY_SEC2PROTK: {
788 struct pkey_sec2protk __user *usp = (void __user *) arg;
789 struct pkey_sec2protk ksp;
790
791 if (copy_from_user(&ksp, usp, sizeof(ksp)))
792 return -EFAULT;
793 rc = cca_sec2protkey(ksp.cardnr, ksp.domain,
794 ksp.seckey.seckey, ksp.protkey.protkey,
795 NULL, &ksp.protkey.type);
796 DEBUG_DBG("%s cca_sec2protkey()=%d\n", __func__, rc);
797 if (rc)
798 break;
799 if (copy_to_user(usp, &ksp, sizeof(ksp)))
800 return -EFAULT;
801 break;
802 }
803 case PKEY_CLR2PROTK: {
804 struct pkey_clr2protk __user *ucp = (void __user *) arg;
805 struct pkey_clr2protk kcp;
806
807 if (copy_from_user(&kcp, ucp, sizeof(kcp)))
808 return -EFAULT;
809 rc = pkey_clr2protkey(kcp.keytype,
810 &kcp.clrkey, &kcp.protkey);
811 DEBUG_DBG("%s pkey_clr2protkey()=%d\n", __func__, rc);
812 if (rc)
813 break;
814 if (copy_to_user(ucp, &kcp, sizeof(kcp)))
815 return -EFAULT;
816 memzero_explicit(&kcp, sizeof(kcp));
817 break;
818 }
819 case PKEY_FINDCARD: {
820 struct pkey_findcard __user *ufc = (void __user *) arg;
821 struct pkey_findcard kfc;
822
823 if (copy_from_user(&kfc, ufc, sizeof(kfc)))
824 return -EFAULT;
825 rc = cca_findcard(kfc.seckey.seckey,
826 &kfc.cardnr, &kfc.domain, 1);
827 DEBUG_DBG("%s cca_findcard()=%d\n", __func__, rc);
828 if (rc < 0)
829 break;
830 if (copy_to_user(ufc, &kfc, sizeof(kfc)))
831 return -EFAULT;
832 break;
833 }
834 case PKEY_SKEY2PKEY: {
835 struct pkey_skey2pkey __user *usp = (void __user *) arg;
836 struct pkey_skey2pkey ksp;
837
838 if (copy_from_user(&ksp, usp, sizeof(ksp)))
839 return -EFAULT;
840 rc = pkey_skey2pkey(ksp.seckey.seckey, &ksp.protkey);
841 DEBUG_DBG("%s pkey_skey2pkey()=%d\n", __func__, rc);
842 if (rc)
843 break;
844 if (copy_to_user(usp, &ksp, sizeof(ksp)))
845 return -EFAULT;
846 break;
847 }
848 case PKEY_VERIFYKEY: {
849 struct pkey_verifykey __user *uvk = (void __user *) arg;
850 struct pkey_verifykey kvk;
851
852 if (copy_from_user(&kvk, uvk, sizeof(kvk)))
853 return -EFAULT;
854 rc = pkey_verifykey(&kvk.seckey, &kvk.cardnr, &kvk.domain,
855 &kvk.keysize, &kvk.attributes);
856 DEBUG_DBG("%s pkey_verifykey()=%d\n", __func__, rc);
857 if (rc)
858 break;
859 if (copy_to_user(uvk, &kvk, sizeof(kvk)))
860 return -EFAULT;
861 break;
862 }
863 case PKEY_GENPROTK: {
864 struct pkey_genprotk __user *ugp = (void __user *) arg;
865 struct pkey_genprotk kgp;
866
867 if (copy_from_user(&kgp, ugp, sizeof(kgp)))
868 return -EFAULT;
869 rc = pkey_genprotkey(kgp.keytype, &kgp.protkey);
870 DEBUG_DBG("%s pkey_genprotkey()=%d\n", __func__, rc);
871 if (rc)
872 break;
873 if (copy_to_user(ugp, &kgp, sizeof(kgp)))
874 return -EFAULT;
875 break;
876 }
877 case PKEY_VERIFYPROTK: {
878 struct pkey_verifyprotk __user *uvp = (void __user *) arg;
879 struct pkey_verifyprotk kvp;
880
881 if (copy_from_user(&kvp, uvp, sizeof(kvp)))
882 return -EFAULT;
883 rc = pkey_verifyprotkey(&kvp.protkey);
884 DEBUG_DBG("%s pkey_verifyprotkey()=%d\n", __func__, rc);
885 break;
886 }
887 case PKEY_KBLOB2PROTK: {
888 struct pkey_kblob2pkey __user *utp = (void __user *) arg;
889 struct pkey_kblob2pkey ktp;
890 u8 *kkey;
891
892 if (copy_from_user(&ktp, utp, sizeof(ktp)))
893 return -EFAULT;
894 kkey = _copy_key_from_user(ktp.key, ktp.keylen);
895 if (IS_ERR(kkey))
896 return PTR_ERR(kkey);
897 rc = pkey_keyblob2pkey(kkey, ktp.keylen, &ktp.protkey);
898 DEBUG_DBG("%s pkey_keyblob2pkey()=%d\n", __func__, rc);
899 kfree(kkey);
900 if (rc)
901 break;
902 if (copy_to_user(utp, &ktp, sizeof(ktp)))
903 return -EFAULT;
904 break;
905 }
906 case PKEY_GENSECK2: {
907 struct pkey_genseck2 __user *ugs = (void __user *) arg;
908 struct pkey_genseck2 kgs;
909 struct pkey_apqn *apqns;
910 size_t klen = KEYBLOBBUFSIZE;
911 u8 *kkey;
912
913 if (copy_from_user(&kgs, ugs, sizeof(kgs)))
914 return -EFAULT;
915 apqns = _copy_apqns_from_user(kgs.apqns, kgs.apqn_entries);
916 if (IS_ERR(apqns))
917 return PTR_ERR(apqns);
918 kkey = kmalloc(klen, GFP_KERNEL);
919 if (!kkey) {
920 kfree(apqns);
921 return -ENOMEM;
922 }
923 rc = pkey_genseckey2(apqns, kgs.apqn_entries,
924 kgs.type, kgs.size, kgs.keygenflags,
925 kkey, &klen);
926 DEBUG_DBG("%s pkey_genseckey2()=%d\n", __func__, rc);
927 kfree(apqns);
928 if (rc) {
929 kfree(kkey);
930 break;
931 }
932 if (kgs.key) {
933 if (kgs.keylen < klen) {
934 kfree(kkey);
935 return -EINVAL;
936 }
937 if (copy_to_user(kgs.key, kkey, klen)) {
938 kfree(kkey);
939 return -EFAULT;
940 }
941 }
942 kgs.keylen = klen;
943 if (copy_to_user(ugs, &kgs, sizeof(kgs)))
944 rc = -EFAULT;
945 kfree(kkey);
946 break;
947 }
948 case PKEY_CLR2SECK2: {
949 struct pkey_clr2seck2 __user *ucs = (void __user *) arg;
950 struct pkey_clr2seck2 kcs;
951 struct pkey_apqn *apqns;
952 size_t klen = KEYBLOBBUFSIZE;
953 u8 *kkey;
954
955 if (copy_from_user(&kcs, ucs, sizeof(kcs)))
956 return -EFAULT;
957 apqns = _copy_apqns_from_user(kcs.apqns, kcs.apqn_entries);
958 if (IS_ERR(apqns))
959 return PTR_ERR(apqns);
960 kkey = kmalloc(klen, GFP_KERNEL);
961 if (!kkey) {
962 kfree(apqns);
963 return -ENOMEM;
964 }
965 rc = pkey_clr2seckey2(apqns, kcs.apqn_entries,
966 kcs.type, kcs.size, kcs.keygenflags,
967 kcs.clrkey.clrkey, kkey, &klen);
968 DEBUG_DBG("%s pkey_clr2seckey2()=%d\n", __func__, rc);
969 kfree(apqns);
970 if (rc) {
971 kfree(kkey);
972 break;
973 }
974 if (kcs.key) {
975 if (kcs.keylen < klen) {
976 kfree(kkey);
977 return -EINVAL;
978 }
979 if (copy_to_user(kcs.key, kkey, klen)) {
980 kfree(kkey);
981 return -EFAULT;
982 }
983 }
984 kcs.keylen = klen;
985 if (copy_to_user(ucs, &kcs, sizeof(kcs)))
986 rc = -EFAULT;
987 memzero_explicit(&kcs, sizeof(kcs));
988 kfree(kkey);
989 break;
990 }
991 case PKEY_VERIFYKEY2: {
992 struct pkey_verifykey2 __user *uvk = (void __user *) arg;
993 struct pkey_verifykey2 kvk;
994 u8 *kkey;
995
996 if (copy_from_user(&kvk, uvk, sizeof(kvk)))
997 return -EFAULT;
998 kkey = _copy_key_from_user(kvk.key, kvk.keylen);
999 if (IS_ERR(kkey))
1000 return PTR_ERR(kkey);
1001 rc = pkey_verifykey2(kkey, kvk.keylen,
1002 &kvk.cardnr, &kvk.domain,
1003 &kvk.type, &kvk.size, &kvk.flags);
1004 DEBUG_DBG("%s pkey_verifykey2()=%d\n", __func__, rc);
1005 kfree(kkey);
1006 if (rc)
1007 break;
1008 if (copy_to_user(uvk, &kvk, sizeof(kvk)))
1009 return -EFAULT;
1010 break;
1011 }
1012 case PKEY_KBLOB2PROTK2: {
1013 struct pkey_kblob2pkey2 __user *utp = (void __user *) arg;
1014 struct pkey_kblob2pkey2 ktp;
1015 struct pkey_apqn *apqns = NULL;
1016 u8 *kkey;
1017
1018 if (copy_from_user(&ktp, utp, sizeof(ktp)))
1019 return -EFAULT;
1020 apqns = _copy_apqns_from_user(ktp.apqns, ktp.apqn_entries);
1021 if (IS_ERR(apqns))
1022 return PTR_ERR(apqns);
1023 kkey = _copy_key_from_user(ktp.key, ktp.keylen);
1024 if (IS_ERR(kkey)) {
1025 kfree(apqns);
1026 return PTR_ERR(kkey);
1027 }
1028 rc = pkey_keyblob2pkey2(apqns, ktp.apqn_entries,
1029 kkey, ktp.keylen, &ktp.protkey);
1030 DEBUG_DBG("%s pkey_keyblob2pkey2()=%d\n", __func__, rc);
1031 kfree(apqns);
1032 kfree(kkey);
1033 if (rc)
1034 break;
1035 if (copy_to_user(utp, &ktp, sizeof(ktp)))
1036 return -EFAULT;
1037 break;
1038 }
1039 case PKEY_APQNS4K: {
1040 struct pkey_apqns4key __user *uak = (void __user *) arg;
1041 struct pkey_apqns4key kak;
1042 struct pkey_apqn *apqns = NULL;
1043 size_t nr_apqns, len;
1044 u8 *kkey;
1045
1046 if (copy_from_user(&kak, uak, sizeof(kak)))
1047 return -EFAULT;
1048 nr_apqns = kak.apqn_entries;
1049 if (nr_apqns) {
1050 apqns = kmalloc_array(nr_apqns,
1051 sizeof(struct pkey_apqn),
1052 GFP_KERNEL);
1053 if (!apqns)
1054 return -ENOMEM;
1055 }
1056 kkey = _copy_key_from_user(kak.key, kak.keylen);
1057 if (IS_ERR(kkey)) {
1058 kfree(apqns);
1059 return PTR_ERR(kkey);
1060 }
1061 rc = pkey_apqns4key(kkey, kak.keylen, kak.flags,
1062 apqns, &nr_apqns);
1063 DEBUG_DBG("%s pkey_apqns4key()=%d\n", __func__, rc);
1064 kfree(kkey);
1065 if (rc && rc != -ENOSPC) {
1066 kfree(apqns);
1067 break;
1068 }
1069 if (!rc && kak.apqns) {
1070 if (nr_apqns > kak.apqn_entries) {
1071 kfree(apqns);
1072 return -EINVAL;
1073 }
1074 len = nr_apqns * sizeof(struct pkey_apqn);
1075 if (len) {
1076 if (copy_to_user(kak.apqns, apqns, len)) {
1077 kfree(apqns);
1078 return -EFAULT;
1079 }
1080 }
1081 }
1082 kak.apqn_entries = nr_apqns;
1083 if (copy_to_user(uak, &kak, sizeof(kak)))
1084 rc = -EFAULT;
1085 kfree(apqns);
1086 break;
1087 }
1088 case PKEY_APQNS4KT: {
1089 struct pkey_apqns4keytype __user *uat = (void __user *) arg;
1090 struct pkey_apqns4keytype kat;
1091 struct pkey_apqn *apqns = NULL;
1092 size_t nr_apqns, len;
1093
1094 if (copy_from_user(&kat, uat, sizeof(kat)))
1095 return -EFAULT;
1096 nr_apqns = kat.apqn_entries;
1097 if (nr_apqns) {
1098 apqns = kmalloc_array(nr_apqns,
1099 sizeof(struct pkey_apqn),
1100 GFP_KERNEL);
1101 if (!apqns)
1102 return -ENOMEM;
1103 }
1104 rc = pkey_apqns4keytype(kat.type, kat.cur_mkvp, kat.alt_mkvp,
1105 kat.flags, apqns, &nr_apqns);
1106 DEBUG_DBG("%s pkey_apqns4keytype()=%d\n", __func__, rc);
1107 if (rc && rc != -ENOSPC) {
1108 kfree(apqns);
1109 break;
1110 }
1111 if (!rc && kat.apqns) {
1112 if (nr_apqns > kat.apqn_entries) {
1113 kfree(apqns);
1114 return -EINVAL;
1115 }
1116 len = nr_apqns * sizeof(struct pkey_apqn);
1117 if (len) {
1118 if (copy_to_user(kat.apqns, apqns, len)) {
1119 kfree(apqns);
1120 return -EFAULT;
1121 }
1122 }
1123 }
1124 kat.apqn_entries = nr_apqns;
1125 if (copy_to_user(uat, &kat, sizeof(kat)))
1126 rc = -EFAULT;
1127 kfree(apqns);
1128 break;
1129 }
1130 default:
1131 /* unknown/unsupported ioctl cmd */
1132 return -ENOTTY;
1133 }
1134
1135 return rc;
1136}
1137
1138/*
1139 * Sysfs and file io operations
1140 */
1141
1142/*
1143 * Sysfs attribute read function for all protected key binary attributes.
1144 * The implementation can not deal with partial reads, because a new random
1145 * protected key blob is generated with each read. In case of partial reads
1146 * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
1147 */
1148static ssize_t pkey_protkey_aes_attr_read(u32 keytype, bool is_xts, char *buf,
1149 loff_t off, size_t count)
1150{
1151 struct protaeskeytoken protkeytoken;
1152 struct pkey_protkey protkey;
1153 int rc;
1154
1155 if (off != 0 || count < sizeof(protkeytoken))
1156 return -EINVAL;
1157 if (is_xts)
1158 if (count < 2 * sizeof(protkeytoken))
1159 return -EINVAL;
1160
1161 memset(&protkeytoken, 0, sizeof(protkeytoken));
1162 protkeytoken.type = TOKTYPE_NON_CCA;
1163 protkeytoken.version = TOKVER_PROTECTED_KEY;
1164 protkeytoken.keytype = keytype;
1165
1166 rc = pkey_genprotkey(protkeytoken.keytype, &protkey);
1167 if (rc)
1168 return rc;
1169
1170 protkeytoken.len = protkey.len;
1171 memcpy(&protkeytoken.protkey, &protkey.protkey, protkey.len);
1172
1173 memcpy(buf, &protkeytoken, sizeof(protkeytoken));
1174
1175 if (is_xts) {
1176 rc = pkey_genprotkey(protkeytoken.keytype, &protkey);
1177 if (rc)
1178 return rc;
1179
1180 protkeytoken.len = protkey.len;
1181 memcpy(&protkeytoken.protkey, &protkey.protkey, protkey.len);
1182
1183 memcpy(buf + sizeof(protkeytoken), &protkeytoken,
1184 sizeof(protkeytoken));
1185
1186 return 2 * sizeof(protkeytoken);
1187 }
1188
1189 return sizeof(protkeytoken);
1190}
1191
1192static ssize_t protkey_aes_128_read(struct file *filp,
1193 struct kobject *kobj,
1194 struct bin_attribute *attr,
1195 char *buf, loff_t off,
1196 size_t count)
1197{
1198 return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_128, false, buf,
1199 off, count);
1200}
1201
1202static ssize_t protkey_aes_192_read(struct file *filp,
1203 struct kobject *kobj,
1204 struct bin_attribute *attr,
1205 char *buf, loff_t off,
1206 size_t count)
1207{
1208 return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_192, false, buf,
1209 off, count);
1210}
1211
1212static ssize_t protkey_aes_256_read(struct file *filp,
1213 struct kobject *kobj,
1214 struct bin_attribute *attr,
1215 char *buf, loff_t off,
1216 size_t count)
1217{
1218 return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_256, false, buf,
1219 off, count);
1220}
1221
1222static ssize_t protkey_aes_128_xts_read(struct file *filp,
1223 struct kobject *kobj,
1224 struct bin_attribute *attr,
1225 char *buf, loff_t off,
1226 size_t count)
1227{
1228 return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_128, true, buf,
1229 off, count);
1230}
1231
1232static ssize_t protkey_aes_256_xts_read(struct file *filp,
1233 struct kobject *kobj,
1234 struct bin_attribute *attr,
1235 char *buf, loff_t off,
1236 size_t count)
1237{
1238 return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_256, true, buf,
1239 off, count);
1240}
1241
1242static BIN_ATTR_RO(protkey_aes_128, sizeof(struct protaeskeytoken));
1243static BIN_ATTR_RO(protkey_aes_192, sizeof(struct protaeskeytoken));
1244static BIN_ATTR_RO(protkey_aes_256, sizeof(struct protaeskeytoken));
1245static BIN_ATTR_RO(protkey_aes_128_xts, 2 * sizeof(struct protaeskeytoken));
1246static BIN_ATTR_RO(protkey_aes_256_xts, 2 * sizeof(struct protaeskeytoken));
1247
1248static struct bin_attribute *protkey_attrs[] = {
1249 &bin_attr_protkey_aes_128,
1250 &bin_attr_protkey_aes_192,
1251 &bin_attr_protkey_aes_256,
1252 &bin_attr_protkey_aes_128_xts,
1253 &bin_attr_protkey_aes_256_xts,
1254 NULL
1255};
1256
1257static struct attribute_group protkey_attr_group = {
1258 .name = "protkey",
1259 .bin_attrs = protkey_attrs,
1260};
1261
1262/*
1263 * Sysfs attribute read function for all secure key ccadata binary attributes.
1264 * The implementation can not deal with partial reads, because a new random
1265 * protected key blob is generated with each read. In case of partial reads
1266 * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
1267 */
1268static ssize_t pkey_ccadata_aes_attr_read(u32 keytype, bool is_xts, char *buf,
1269 loff_t off, size_t count)
1270{
1271 int rc;
1272 struct pkey_seckey *seckey = (struct pkey_seckey *) buf;
1273
1274 if (off != 0 || count < sizeof(struct secaeskeytoken))
1275 return -EINVAL;
1276 if (is_xts)
1277 if (count < 2 * sizeof(struct secaeskeytoken))
1278 return -EINVAL;
1279
1280 rc = cca_genseckey(-1, -1, keytype, seckey->seckey);
1281 if (rc)
1282 return rc;
1283
1284 if (is_xts) {
1285 seckey++;
1286 rc = cca_genseckey(-1, -1, keytype, seckey->seckey);
1287 if (rc)
1288 return rc;
1289
1290 return 2 * sizeof(struct secaeskeytoken);
1291 }
1292
1293 return sizeof(struct secaeskeytoken);
1294}
1295
1296static ssize_t ccadata_aes_128_read(struct file *filp,
1297 struct kobject *kobj,
1298 struct bin_attribute *attr,
1299 char *buf, loff_t off,
1300 size_t count)
1301{
1302 return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_128, false, buf,
1303 off, count);
1304}
1305
1306static ssize_t ccadata_aes_192_read(struct file *filp,
1307 struct kobject *kobj,
1308 struct bin_attribute *attr,
1309 char *buf, loff_t off,
1310 size_t count)
1311{
1312 return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_192, false, buf,
1313 off, count);
1314}
1315
1316static ssize_t ccadata_aes_256_read(struct file *filp,
1317 struct kobject *kobj,
1318 struct bin_attribute *attr,
1319 char *buf, loff_t off,
1320 size_t count)
1321{
1322 return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_256, false, buf,
1323 off, count);
1324}
1325
1326static ssize_t ccadata_aes_128_xts_read(struct file *filp,
1327 struct kobject *kobj,
1328 struct bin_attribute *attr,
1329 char *buf, loff_t off,
1330 size_t count)
1331{
1332 return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_128, true, buf,
1333 off, count);
1334}
1335
1336static ssize_t ccadata_aes_256_xts_read(struct file *filp,
1337 struct kobject *kobj,
1338 struct bin_attribute *attr,
1339 char *buf, loff_t off,
1340 size_t count)
1341{
1342 return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_256, true, buf,
1343 off, count);
1344}
1345
1346static BIN_ATTR_RO(ccadata_aes_128, sizeof(struct secaeskeytoken));
1347static BIN_ATTR_RO(ccadata_aes_192, sizeof(struct secaeskeytoken));
1348static BIN_ATTR_RO(ccadata_aes_256, sizeof(struct secaeskeytoken));
1349static BIN_ATTR_RO(ccadata_aes_128_xts, 2 * sizeof(struct secaeskeytoken));
1350static BIN_ATTR_RO(ccadata_aes_256_xts, 2 * sizeof(struct secaeskeytoken));
1351
1352static struct bin_attribute *ccadata_attrs[] = {
1353 &bin_attr_ccadata_aes_128,
1354 &bin_attr_ccadata_aes_192,
1355 &bin_attr_ccadata_aes_256,
1356 &bin_attr_ccadata_aes_128_xts,
1357 &bin_attr_ccadata_aes_256_xts,
1358 NULL
1359};
1360
1361static struct attribute_group ccadata_attr_group = {
1362 .name = "ccadata",
1363 .bin_attrs = ccadata_attrs,
1364};
1365
1366#define CCACIPHERTOKENSIZE (sizeof(struct cipherkeytoken) + 80)
1367
1368/*
1369 * Sysfs attribute read function for all secure key ccacipher binary attributes.
1370 * The implementation can not deal with partial reads, because a new random
1371 * secure key blob is generated with each read. In case of partial reads
1372 * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
1373 */
1374static ssize_t pkey_ccacipher_aes_attr_read(enum pkey_key_size keybits,
1375 bool is_xts, char *buf, loff_t off,
1376 size_t count)
1377{
1378 size_t keysize;
1379 int rc;
1380
1381 if (off != 0 || count < CCACIPHERTOKENSIZE)
1382 return -EINVAL;
1383 if (is_xts)
1384 if (count < 2 * CCACIPHERTOKENSIZE)
1385 return -EINVAL;
1386
1387 keysize = CCACIPHERTOKENSIZE;
1388 rc = cca_gencipherkey(-1, -1, keybits, 0, buf, &keysize);
1389 if (rc)
1390 return rc;
1391 memset(buf + keysize, 0, CCACIPHERTOKENSIZE - keysize);
1392
1393 if (is_xts) {
1394 keysize = CCACIPHERTOKENSIZE;
1395 rc = cca_gencipherkey(-1, -1, keybits, 0,
1396 buf + CCACIPHERTOKENSIZE, &keysize);
1397 if (rc)
1398 return rc;
1399 memset(buf + CCACIPHERTOKENSIZE + keysize, 0,
1400 CCACIPHERTOKENSIZE - keysize);
1401
1402 return 2 * CCACIPHERTOKENSIZE;
1403 }
1404
1405 return CCACIPHERTOKENSIZE;
1406}
1407
1408static ssize_t ccacipher_aes_128_read(struct file *filp,
1409 struct kobject *kobj,
1410 struct bin_attribute *attr,
1411 char *buf, loff_t off,
1412 size_t count)
1413{
1414 return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_128, false, buf,
1415 off, count);
1416}
1417
1418static ssize_t ccacipher_aes_192_read(struct file *filp,
1419 struct kobject *kobj,
1420 struct bin_attribute *attr,
1421 char *buf, loff_t off,
1422 size_t count)
1423{
1424 return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_192, false, buf,
1425 off, count);
1426}
1427
1428static ssize_t ccacipher_aes_256_read(struct file *filp,
1429 struct kobject *kobj,
1430 struct bin_attribute *attr,
1431 char *buf, loff_t off,
1432 size_t count)
1433{
1434 return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_256, false, buf,
1435 off, count);
1436}
1437
1438static ssize_t ccacipher_aes_128_xts_read(struct file *filp,
1439 struct kobject *kobj,
1440 struct bin_attribute *attr,
1441 char *buf, loff_t off,
1442 size_t count)
1443{
1444 return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_128, true, buf,
1445 off, count);
1446}
1447
1448static ssize_t ccacipher_aes_256_xts_read(struct file *filp,
1449 struct kobject *kobj,
1450 struct bin_attribute *attr,
1451 char *buf, loff_t off,
1452 size_t count)
1453{
1454 return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_256, true, buf,
1455 off, count);
1456}
1457
1458static BIN_ATTR_RO(ccacipher_aes_128, CCACIPHERTOKENSIZE);
1459static BIN_ATTR_RO(ccacipher_aes_192, CCACIPHERTOKENSIZE);
1460static BIN_ATTR_RO(ccacipher_aes_256, CCACIPHERTOKENSIZE);
1461static BIN_ATTR_RO(ccacipher_aes_128_xts, 2 * CCACIPHERTOKENSIZE);
1462static BIN_ATTR_RO(ccacipher_aes_256_xts, 2 * CCACIPHERTOKENSIZE);
1463
1464static struct bin_attribute *ccacipher_attrs[] = {
1465 &bin_attr_ccacipher_aes_128,
1466 &bin_attr_ccacipher_aes_192,
1467 &bin_attr_ccacipher_aes_256,
1468 &bin_attr_ccacipher_aes_128_xts,
1469 &bin_attr_ccacipher_aes_256_xts,
1470 NULL
1471};
1472
1473static struct attribute_group ccacipher_attr_group = {
1474 .name = "ccacipher",
1475 .bin_attrs = ccacipher_attrs,
1476};
1477
1478static const struct attribute_group *pkey_attr_groups[] = {
1479 &protkey_attr_group,
1480 &ccadata_attr_group,
1481 &ccacipher_attr_group,
1482 NULL,
1483};
1484
1485static const struct file_operations pkey_fops = {
1486 .owner = THIS_MODULE,
1487 .open = nonseekable_open,
1488 .llseek = no_llseek,
1489 .unlocked_ioctl = pkey_unlocked_ioctl,
1490};
1491
1492static struct miscdevice pkey_dev = {
1493 .name = "pkey",
1494 .minor = MISC_DYNAMIC_MINOR,
1495 .mode = 0666,
1496 .fops = &pkey_fops,
1497 .groups = pkey_attr_groups,
1498};
1499
1500/*
1501 * Module init
1502 */
1503static int __init pkey_init(void)
1504{
1505 cpacf_mask_t kmc_functions;
1506
1507 /*
1508 * The pckmo instruction should be available - even if we don't
1509 * actually invoke it. This instruction comes with MSA 3 which
1510 * is also the minimum level for the kmc instructions which
1511 * are able to work with protected keys.
1512 */
1513 if (!cpacf_query(CPACF_PCKMO, &pckmo_functions))
1514 return -ENODEV;
1515
1516 /* check for kmc instructions available */
1517 if (!cpacf_query(CPACF_KMC, &kmc_functions))
1518 return -ENODEV;
1519 if (!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
1520 !cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
1521 !cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256))
1522 return -ENODEV;
1523
1524 pkey_debug_init();
1525
1526 return misc_register(&pkey_dev);
1527}
1528
1529/*
1530 * Module exit
1531 */
1532static void __exit pkey_exit(void)
1533{
1534 misc_deregister(&pkey_dev);
1535 pkey_debug_exit();
1536}
1537
1538module_cpu_feature_match(MSA, pkey_init);
1539module_exit(pkey_exit);