1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2014, 2015 Intel Corporation
4 *
5 * Authors:
6 * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
7 *
8 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
9 *
10 * This file contains TPM2 protocol implementations of the commands
11 * used by the kernel internally.
12 */
13
14 #include "linux/dev_printk.h"
15 #include "linux/tpm.h"
16 #include "tpm.h"
17 #include <crypto/hash_info.h>
18 #include <linux/unaligned.h>
19
20 static bool disable_pcr_integrity;
21 module_param(disable_pcr_integrity, bool, 0444);
22 MODULE_PARM_DESC(disable_pcr_integrity, "Disable integrity protection of TPM2_PCR_Extend");
23
24 static const struct tpm2_hash tpm2_hash_map[] = {
25 {HASH_ALGO_SHA1, TPM_ALG_SHA1},
26 {HASH_ALGO_SHA256, TPM_ALG_SHA256},
27 {HASH_ALGO_SHA384, TPM_ALG_SHA384},
28 {HASH_ALGO_SHA512, TPM_ALG_SHA512},
29 {HASH_ALGO_SM3_256, TPM_ALG_SM3_256},
30 };
31
tpm2_find_hash_alg(unsigned int crypto_id)32 int tpm2_find_hash_alg(unsigned int crypto_id)
33 {
34 int i;
35
36 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++)
37 if (crypto_id == tpm2_hash_map[i].crypto_id)
38 return tpm2_hash_map[i].tpm_id;
39
40 return -EINVAL;
41 }
42 EXPORT_SYMBOL_GPL(tpm2_find_hash_alg);
43
tpm2_get_timeouts(struct tpm_chip * chip)44 int tpm2_get_timeouts(struct tpm_chip *chip)
45 {
46 chip->timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
47 chip->timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
48 chip->timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
49 chip->timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
50 chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
51 return 0;
52 }
53
54 /*
55 * Contains the maximum durations in milliseconds for TPM2 commands.
56 */
57 static const struct {
58 unsigned long ordinal;
59 unsigned long duration;
60 } tpm2_ordinal_duration_map[] = {
61 {TPM2_CC_STARTUP, 750},
62 {TPM2_CC_SELF_TEST, 3000},
63 {TPM2_CC_GET_RANDOM, 2000},
64 {TPM2_CC_SEQUENCE_UPDATE, 750},
65 {TPM2_CC_SEQUENCE_COMPLETE, 750},
66 {TPM2_CC_EVENT_SEQUENCE_COMPLETE, 750},
67 {TPM2_CC_HASH_SEQUENCE_START, 750},
68 {TPM2_CC_VERIFY_SIGNATURE, 30000},
69 {TPM2_CC_PCR_EXTEND, 750},
70 {TPM2_CC_HIERARCHY_CONTROL, 2000},
71 {TPM2_CC_HIERARCHY_CHANGE_AUTH, 2000},
72 {TPM2_CC_GET_CAPABILITY, 750},
73 {TPM2_CC_NV_READ, 2000},
74 {TPM2_CC_CREATE_PRIMARY, 300000},
75 {TPM2_CC_CREATE, 300000},
76 {TPM2_CC_CREATE_LOADED, 300000},
77 };
78
79 /**
80 * tpm2_calc_ordinal_duration() - Calculate the maximum command duration
81 * @ordinal: TPM command ordinal.
82 *
83 * Returns the maximum amount of time the chip is expected by kernel to
84 * take in jiffies.
85 */
tpm2_calc_ordinal_duration(u32 ordinal)86 unsigned long tpm2_calc_ordinal_duration(u32 ordinal)
87 {
88 int i;
89
90 for (i = 0; i < ARRAY_SIZE(tpm2_ordinal_duration_map); i++)
91 if (ordinal == tpm2_ordinal_duration_map[i].ordinal)
92 return msecs_to_jiffies(tpm2_ordinal_duration_map[i].duration);
93
94 return msecs_to_jiffies(TPM2_DURATION_DEFAULT);
95 }
96
97 /**
98 * tpm2_pcr_read() - read a PCR value
99 * @chip: TPM chip to use.
100 * @pcr_idx: index of the PCR to read.
101 * @digest: PCR bank and buffer current PCR value is written to.
102 * @digest_size_ptr: pointer to variable that stores the digest size.
103 *
104 * Return: Same as with tpm_transmit_cmd.
105 */
tpm2_pcr_read(struct tpm_chip * chip,u32 pcr_idx,struct tpm_digest * digest,u16 * digest_size_ptr)106 int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
107 struct tpm_digest *digest, u16 *digest_size_ptr)
108 {
109 int i;
110 int rc;
111 struct tpm2_pcr_read_out *out;
112 u8 pcr_select[TPM2_PCR_SELECT_MIN] = {0};
113 u16 digest_size;
114 u16 expected_digest_size = 0;
115
116 struct tpm_buf *buf __free(kfree) = NULL;
117
118 if (pcr_idx >= TPM2_PLATFORM_PCR)
119 return -EINVAL;
120
121 if (!digest_size_ptr) {
122 for (i = 0; i < chip->nr_allocated_banks &&
123 chip->allocated_banks[i].alg_id != digest->alg_id; i++)
124 ;
125
126 if (i == chip->nr_allocated_banks)
127 return -EINVAL;
128
129 expected_digest_size = chip->allocated_banks[i].digest_size;
130 }
131
132 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
133 if (!buf)
134 return -ENOMEM;
135
136 tpm_buf_init(buf, TPM_BUFSIZE);
137 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_PCR_READ);
138
139 pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
140
141 tpm_buf_append_u32(buf, 1);
142 tpm_buf_append_u16(buf, digest->alg_id);
143 tpm_buf_append_u8(buf, TPM2_PCR_SELECT_MIN);
144 tpm_buf_append(buf, (const unsigned char *)pcr_select,
145 sizeof(pcr_select));
146
147 rc = tpm_transmit_cmd(chip, buf, 0, "attempting to read a pcr value");
148 if (rc)
149 return rc;
150
151 out = (struct tpm2_pcr_read_out *)&buf->data[TPM_HEADER_SIZE];
152 digest_size = be16_to_cpu(out->digest_size);
153 if (digest_size > sizeof(digest->digest) ||
154 (!digest_size_ptr && digest_size != expected_digest_size))
155 return -EINVAL;
156
157 if (digest_size_ptr)
158 *digest_size_ptr = digest_size;
159
160 memcpy(digest->digest, out->digest, digest_size);
161 return rc;
162 }
163
164 /**
165 * tpm2_pcr_extend() - extend a PCR value
166 *
167 * @chip: TPM chip to use.
168 * @pcr_idx: index of the PCR.
169 * @digests: list of pcr banks and corresponding digest values to extend.
170 *
171 * Return: Same as with tpm_transmit_cmd.
172 */
tpm2_pcr_extend(struct tpm_chip * chip,u32 pcr_idx,struct tpm_digest * digests)173 int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
174 struct tpm_digest *digests)
175 {
176 struct tpm_buf *buf __free(kfree) = NULL;
177 int rc;
178 int i;
179
180 if (!disable_pcr_integrity) {
181 rc = tpm2_start_auth_session(chip);
182 if (rc)
183 return rc;
184 }
185
186 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
187 if (!buf) {
188 if (!disable_pcr_integrity)
189 tpm2_end_auth_session(chip);
190 return -ENOMEM;
191 }
192
193 tpm_buf_init(buf, TPM_BUFSIZE);
194 tpm_buf_reset(buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
195
196 if (!disable_pcr_integrity) {
197 rc = tpm_buf_append_name(chip, buf, pcr_idx, NULL);
198 if (rc) {
199 tpm2_end_auth_session(chip);
200 return rc;
201 }
202 tpm_buf_append_hmac_session(chip, buf, 0, NULL, 0);
203 } else {
204 tpm_buf_append_handle(buf, pcr_idx);
205 tpm_buf_append_auth(chip, buf, NULL, 0);
206 }
207
208 tpm_buf_append_u32(buf, chip->nr_allocated_banks);
209
210 for (i = 0; i < chip->nr_allocated_banks; i++) {
211 tpm_buf_append_u16(buf, digests[i].alg_id);
212 tpm_buf_append(buf, (const unsigned char *)&digests[i].digest,
213 chip->allocated_banks[i].digest_size);
214 }
215
216 if (!disable_pcr_integrity) {
217 rc = tpm_buf_fill_hmac_session(chip, buf);
218 if (rc)
219 return rc;
220 }
221
222 rc = tpm_transmit_cmd(chip, buf, 0, "attempting extend a PCR value");
223 if (!disable_pcr_integrity)
224 rc = tpm_buf_check_hmac_response(chip, buf, rc);
225
226 return rc;
227 }
228
229 /**
230 * tpm2_get_random() - get random bytes from the TPM RNG
231 *
232 * @chip: a &tpm_chip instance
233 * @dest: destination buffer
234 * @max: the max number of random bytes to pull
235 *
236 * Return:
237 * size of the buffer on success,
238 * -errno otherwise (positive TPM return codes are masked to -EIO)
239 */
tpm2_get_random(struct tpm_chip * chip,u8 * dest,size_t max)240 int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
241 {
242 struct tpm2_get_random_out *out;
243 struct tpm_header *head;
244 u32 recd;
245 u32 num_bytes = max;
246 int err;
247 int total = 0;
248 int retries = 5;
249 u8 *dest_ptr = dest;
250 off_t offset;
251
252 struct tpm_buf *buf __free(kfree) = NULL;
253
254 if (!num_bytes || max > TPM_MAX_RNG_DATA)
255 return -EINVAL;
256
257 err = tpm2_start_auth_session(chip);
258 if (err)
259 return err;
260
261 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
262 if (!buf) {
263 tpm2_end_auth_session(chip);
264 return -ENOMEM;
265 }
266
267 tpm_buf_init(buf, TPM_BUFSIZE);
268
269 do {
270 tpm_buf_reset(buf, TPM2_ST_SESSIONS, TPM2_CC_GET_RANDOM);
271 if (tpm2_chip_auth(chip)) {
272 tpm_buf_append_hmac_session(chip, buf,
273 TPM2_SA_ENCRYPT |
274 TPM2_SA_CONTINUE_SESSION,
275 NULL, 0);
276 } else {
277 offset = buf->handles * 4 + TPM_HEADER_SIZE;
278 head = (struct tpm_header *)buf->data;
279 if (tpm_buf_length(buf) == offset)
280 head->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
281 }
282 tpm_buf_append_u16(buf, num_bytes);
283 err = tpm_buf_fill_hmac_session(chip, buf);
284 if (err)
285 return err;
286
287 err = tpm_transmit_cmd(chip, buf,
288 offsetof(struct tpm2_get_random_out,
289 buffer),
290 "attempting get random");
291 err = tpm_buf_check_hmac_response(chip, buf, err);
292 if (err) {
293 if (err > 0)
294 err = -EIO;
295 tpm2_end_auth_session(chip);
296 return err;
297 }
298
299 head = (struct tpm_header *)buf->data;
300 offset = TPM_HEADER_SIZE;
301 /* Skip the parameter size field: */
302 if (be16_to_cpu(head->tag) == TPM2_ST_SESSIONS)
303 offset += 4;
304
305 out = (struct tpm2_get_random_out *)&buf->data[offset];
306 recd = min_t(u32, be16_to_cpu(out->size), num_bytes);
307 if (tpm_buf_length(buf) <
308 TPM_HEADER_SIZE +
309 offsetof(struct tpm2_get_random_out, buffer) +
310 recd) {
311 tpm2_end_auth_session(chip);
312 return -EFAULT;
313 }
314 memcpy(dest_ptr, out->buffer, recd);
315
316 dest_ptr += recd;
317 total += recd;
318 num_bytes -= recd;
319 } while (retries-- && total < max);
320
321 return total ? total : -EIO;
322 }
323
324 /**
325 * tpm2_flush_context() - execute a TPM2_FlushContext command
326 * @chip: TPM chip to use
327 * @handle: context handle
328 */
tpm2_flush_context(struct tpm_chip * chip,u32 handle)329 void tpm2_flush_context(struct tpm_chip *chip, u32 handle)
330 {
331 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
332 if (!buf) {
333 dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n",
334 handle);
335 return;
336 }
337
338 tpm_buf_init(buf, TPM_BUFSIZE);
339 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT);
340 tpm_buf_append_u32(buf, handle);
341
342 tpm_transmit_cmd(chip, buf, 0, "flushing context");
343 }
344 EXPORT_SYMBOL_GPL(tpm2_flush_context);
345
346 /**
347 * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property
348 * @chip: a &tpm_chip instance
349 * @property_id: property ID.
350 * @value: output variable.
351 * @desc: passed to tpm_transmit_cmd()
352 *
353 * Return:
354 * 0 on success,
355 * -errno or a TPM return code otherwise
356 */
tpm2_get_tpm_pt(struct tpm_chip * chip,u32 property_id,u32 * value,const char * desc)357 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
358 const char *desc)
359 {
360 struct tpm2_get_cap_out *out;
361 int rc;
362
363 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
364 if (!buf)
365 return -ENOMEM;
366
367 tpm_buf_init(buf, TPM_BUFSIZE);
368 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
369 tpm_buf_append_u32(buf, TPM2_CAP_TPM_PROPERTIES);
370 tpm_buf_append_u32(buf, property_id);
371 tpm_buf_append_u32(buf, 1);
372 rc = tpm_transmit_cmd(chip, buf, 0, NULL);
373 if (!rc) {
374 out = (struct tpm2_get_cap_out *)
375 &buf->data[TPM_HEADER_SIZE];
376 /*
377 * To prevent failing boot up of some systems, Infineon TPM2.0
378 * returns SUCCESS on TPM2_Startup in field upgrade mode. Also
379 * the TPM2_Getcapability command returns a zero length list
380 * in field upgrade mode.
381 */
382 if (be32_to_cpu(out->property_cnt) > 0)
383 *value = be32_to_cpu(out->value);
384 else
385 rc = -ENODATA;
386 }
387 return rc;
388 }
389 EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt);
390
391 /**
392 * tpm2_shutdown() - send a TPM shutdown command
393 *
394 * Sends a TPM shutdown command. The shutdown command is used in call
395 * sites where the system is going down. If it fails, there is not much
396 * that can be done except print an error message.
397 *
398 * @chip: a &tpm_chip instance
399 * @shutdown_type: TPM_SU_CLEAR or TPM_SU_STATE.
400 */
tpm2_shutdown(struct tpm_chip * chip,u16 shutdown_type)401 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
402 {
403 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
404 if (!buf)
405 return;
406
407 tpm_buf_init(buf, TPM_BUFSIZE);
408 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SHUTDOWN);
409 tpm_buf_append_u16(buf, shutdown_type);
410 tpm_transmit_cmd(chip, buf, 0, "stopping the TPM");
411 }
412
413 /**
414 * tpm2_do_selftest() - ensure that all self tests have passed
415 *
416 * @chip: TPM chip to use
417 *
418 * Return: Same as with tpm_transmit_cmd.
419 *
420 * The TPM can either run all self tests synchronously and then return
421 * RC_SUCCESS once all tests were successful. Or it can choose to run the tests
422 * asynchronously and return RC_TESTING immediately while the self tests still
423 * execute in the background. This function handles both cases and waits until
424 * all tests have completed.
425 */
tpm2_do_selftest(struct tpm_chip * chip)426 static int tpm2_do_selftest(struct tpm_chip *chip)
427 {
428 int full;
429 int rc;
430
431 for (full = 0; full < 2; full++) {
432 struct tpm_buf *buf __free(kfree) = NULL;
433
434 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
435 if (!buf)
436 return -ENOMEM;
437
438 tpm_buf_init(buf, TPM_BUFSIZE);
439 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SELF_TEST);
440 tpm_buf_append_u8(buf, full);
441 rc = tpm_transmit_cmd(chip, buf, 0,
442 "attempting the self test");
443 if (rc == TPM2_RC_TESTING)
444 rc = TPM2_RC_SUCCESS;
445 if (rc == TPM2_RC_INITIALIZE || rc == TPM2_RC_SUCCESS)
446 return rc;
447 }
448
449 return rc;
450 }
451
452 /**
453 * tpm2_probe() - probe for the TPM 2.0 protocol
454 * @chip: a &tpm_chip instance
455 *
456 * Send an idempotent TPM 2.0 command and see whether there is TPM2 chip in the
457 * other end based on the response tag. The flag TPM_CHIP_FLAG_TPM2 is set by
458 * this function if this is the case.
459 *
460 * Return:
461 * 0 on success,
462 * -errno otherwise
463 */
tpm2_probe(struct tpm_chip * chip)464 int tpm2_probe(struct tpm_chip *chip)
465 {
466 struct tpm_header *out;
467 int rc;
468
469 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
470 if (!buf)
471 return -ENOMEM;
472
473 tpm_buf_init(buf, TPM_BUFSIZE);
474 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
475 tpm_buf_append_u32(buf, TPM2_CAP_TPM_PROPERTIES);
476 tpm_buf_append_u32(buf, TPM_PT_TOTAL_COMMANDS);
477 tpm_buf_append_u32(buf, 1);
478 rc = tpm_transmit_cmd(chip, buf, 0, NULL);
479 /* We ignore TPM return codes on purpose. */
480 if (rc >= 0) {
481 out = (struct tpm_header *)buf->data;
482 if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS)
483 chip->flags |= TPM_CHIP_FLAG_TPM2;
484 }
485 return 0;
486 }
487 EXPORT_SYMBOL_GPL(tpm2_probe);
488
tpm2_init_bank_info(struct tpm_chip * chip,u32 bank_index)489 static int tpm2_init_bank_info(struct tpm_chip *chip, u32 bank_index)
490 {
491 struct tpm_bank_info *bank = chip->allocated_banks + bank_index;
492 struct tpm_digest digest = { .alg_id = bank->alg_id };
493 int i;
494
495 /*
496 * Avoid unnecessary PCR read operations to reduce overhead
497 * and obtain identifiers of the crypto subsystem.
498 */
499 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
500 enum hash_algo crypto_algo = tpm2_hash_map[i].crypto_id;
501
502 if (bank->alg_id != tpm2_hash_map[i].tpm_id)
503 continue;
504
505 bank->digest_size = hash_digest_size[crypto_algo];
506 bank->crypto_id = crypto_algo;
507 return 0;
508 }
509
510 bank->crypto_id = HASH_ALGO__LAST;
511
512 return tpm2_pcr_read(chip, 0, &digest, &bank->digest_size);
513 }
514
tpm2_get_pcr_allocation(struct tpm_chip * chip)515 ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
516 {
517 struct tpm2_pcr_selection pcr_selection;
518 void *marker;
519 void *end;
520 void *pcr_select_offset;
521 u32 sizeof_pcr_selection;
522 u32 nr_possible_banks;
523 u32 nr_alloc_banks = 0;
524 u16 hash_alg;
525 u32 rsp_len;
526 int rc;
527 int i = 0;
528
529 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
530 if (!buf)
531 return -ENOMEM;
532
533 tpm_buf_init(buf, TPM_BUFSIZE);
534 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
535 tpm_buf_append_u32(buf, TPM2_CAP_PCRS);
536 tpm_buf_append_u32(buf, 0);
537 tpm_buf_append_u32(buf, 1);
538
539 rc = tpm_transmit_cmd(chip, buf, 9, "get tpm pcr allocation");
540 if (rc)
541 return rc;
542
543 nr_possible_banks = be32_to_cpup(
544 (__be32 *)&buf->data[TPM_HEADER_SIZE + 5]);
545 if (nr_possible_banks > TPM2_MAX_PCR_BANKS) {
546 pr_err("tpm: out of bank capacity: %u > %u\n",
547 nr_possible_banks, TPM2_MAX_PCR_BANKS);
548 return -ENOMEM;
549 }
550
551 marker = &buf->data[TPM_HEADER_SIZE + 9];
552
553 rsp_len = be32_to_cpup((__be32 *)&buf->data[2]);
554 end = &buf->data[rsp_len];
555
556 for (i = 0; i < nr_possible_banks; i++) {
557 pcr_select_offset = marker +
558 offsetof(struct tpm2_pcr_selection, size_of_select);
559 if (pcr_select_offset >= end) {
560 rc = -EFAULT;
561 break;
562 }
563
564 memcpy(&pcr_selection, marker, sizeof(pcr_selection));
565 hash_alg = be16_to_cpu(pcr_selection.hash_alg);
566
567 pcr_select_offset = memchr_inv(pcr_selection.pcr_select, 0,
568 pcr_selection.size_of_select);
569 if (pcr_select_offset) {
570 chip->allocated_banks[nr_alloc_banks].alg_id = hash_alg;
571
572 rc = tpm2_init_bank_info(chip, nr_alloc_banks);
573 if (rc < 0)
574 break;
575
576 nr_alloc_banks++;
577 }
578
579 sizeof_pcr_selection = sizeof(pcr_selection.hash_alg) +
580 sizeof(pcr_selection.size_of_select) +
581 pcr_selection.size_of_select;
582 marker = marker + sizeof_pcr_selection;
583 }
584
585 chip->nr_allocated_banks = nr_alloc_banks;
586
587 return rc;
588 }
589
tpm2_get_cc_attrs_tbl(struct tpm_chip * chip)590 int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
591 {
592 u32 nr_commands;
593 __be32 *attrs;
594 u32 cc;
595 int i;
596 int rc;
597
598 struct tpm_buf *buf __free(kfree) = NULL;
599
600 rc = tpm2_get_tpm_pt(chip, TPM_PT_TOTAL_COMMANDS, &nr_commands, NULL);
601 if (rc)
602 goto out;
603
604 if (nr_commands > 0xFFFFF) {
605 rc = -EFAULT;
606 goto out;
607 }
608
609 chip->cc_attrs_tbl = devm_kcalloc(&chip->dev, 4, nr_commands,
610 GFP_KERNEL);
611 if (!chip->cc_attrs_tbl) {
612 rc = -ENOMEM;
613 goto out;
614 }
615
616 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
617 if (!buf) {
618 rc = -ENOMEM;
619 goto out;
620 }
621
622 tpm_buf_init(buf, TPM_BUFSIZE);
623 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
624 tpm_buf_append_u32(buf, TPM2_CAP_COMMANDS);
625 tpm_buf_append_u32(buf, TPM2_CC_FIRST);
626 tpm_buf_append_u32(buf, nr_commands);
627
628 rc = tpm_transmit_cmd(chip, buf, 9 + 4 * nr_commands, NULL);
629 if (rc)
630 goto out;
631
632 if (nr_commands !=
633 be32_to_cpup((__be32 *)&buf->data[TPM_HEADER_SIZE + 5])) {
634 rc = -EFAULT;
635 goto out;
636 }
637
638 chip->nr_commands = nr_commands;
639
640 attrs = (__be32 *)&buf->data[TPM_HEADER_SIZE + 9];
641 for (i = 0; i < nr_commands; i++, attrs++) {
642 chip->cc_attrs_tbl[i] = be32_to_cpup(attrs);
643 cc = chip->cc_attrs_tbl[i] & 0xFFFF;
644
645 if (cc == TPM2_CC_CONTEXT_SAVE || cc == TPM2_CC_FLUSH_CONTEXT) {
646 chip->cc_attrs_tbl[i] &=
647 ~(GENMASK(2, 0) << TPM2_CC_ATTR_CHANDLES);
648 chip->cc_attrs_tbl[i] |= 1 << TPM2_CC_ATTR_CHANDLES;
649 }
650 }
651
652 out:
653 if (rc > 0)
654 rc = -ENODEV;
655 return rc;
656 }
657 EXPORT_SYMBOL_GPL(tpm2_get_cc_attrs_tbl);
658
659 /**
660 * tpm2_startup - turn on the TPM
661 * @chip: TPM chip to use
662 *
663 * Normally the firmware should start the TPM. This function is provided as a
664 * workaround if this does not happen. A legal case for this could be for
665 * example when a TPM emulator is used.
666 *
667 * Return: same as tpm_transmit_cmd()
668 */
669
tpm2_startup(struct tpm_chip * chip)670 static int tpm2_startup(struct tpm_chip *chip)
671 {
672 struct tpm_buf *buf __free(kfree) = NULL;
673
674 dev_info(&chip->dev, "starting up the TPM manually\n");
675
676 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
677 if (!buf)
678 return -ENOMEM;
679
680 tpm_buf_init(buf, TPM_BUFSIZE);
681 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_STARTUP);
682 tpm_buf_append_u16(buf, TPM2_SU_CLEAR);
683 return tpm_transmit_cmd(chip, buf, 0, "attempting to start the TPM");
684 }
685
686 /**
687 * tpm2_auto_startup - Perform the standard automatic TPM initialization
688 * sequence
689 * @chip: TPM chip to use
690 *
691 * Returns 0 on success, < 0 in case of fatal error.
692 */
tpm2_auto_startup(struct tpm_chip * chip)693 int tpm2_auto_startup(struct tpm_chip *chip)
694 {
695 int rc;
696
697 rc = tpm2_get_timeouts(chip);
698 if (rc)
699 goto out;
700
701 rc = tpm2_do_selftest(chip);
702 if (rc && rc != TPM2_RC_INITIALIZE)
703 goto out;
704
705 if (rc == TPM2_RC_INITIALIZE) {
706 rc = tpm2_startup(chip);
707 if (rc)
708 goto out;
709
710 rc = tpm2_do_selftest(chip);
711 if (rc)
712 goto out;
713 }
714
715 rc = tpm2_get_cc_attrs_tbl(chip);
716 if (rc == TPM2_RC_FAILURE || (rc < 0 && rc != -ENOMEM)) {
717 dev_info(&chip->dev,
718 "TPM in field failure mode, requires firmware upgrade\n");
719 chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE;
720 rc = 0;
721 }
722
723 if (rc)
724 goto out;
725
726 rc = tpm2_sessions_init(chip);
727
728 out:
729 /*
730 * Infineon TPM in field upgrade mode will return no data for the number
731 * of supported commands.
732 */
733 if (rc == TPM2_RC_UPGRADE || rc == -ENODATA) {
734 dev_info(&chip->dev, "TPM in field upgrade mode, requires firmware upgrade\n");
735 chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE;
736 rc = 0;
737 }
738
739 if (rc > 0)
740 rc = -ENODEV;
741 return rc;
742 }
743
tpm2_find_cc(struct tpm_chip * chip,u32 cc)744 int tpm2_find_cc(struct tpm_chip *chip, u32 cc)
745 {
746 u32 cc_mask;
747 int i;
748
749 cc_mask = 1 << TPM2_CC_ATTR_VENDOR | GENMASK(15, 0);
750 for (i = 0; i < chip->nr_commands; i++)
751 if (cc == (chip->cc_attrs_tbl[i] & cc_mask))
752 return i;
753
754 return -1;
755 }
756