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 "tpm.h"
15#include <crypto/hash_info.h>
16
17static bool disable_pcr_integrity;
18module_param(disable_pcr_integrity, bool, 0444);
19MODULE_PARM_DESC(disable_pcr_integrity, "Disable integrity protection of TPM2_PCR_Extend");
20
21static struct tpm2_hash tpm2_hash_map[] = {
22 {HASH_ALGO_SHA1, TPM_ALG_SHA1},
23 {HASH_ALGO_SHA256, TPM_ALG_SHA256},
24 {HASH_ALGO_SHA384, TPM_ALG_SHA384},
25 {HASH_ALGO_SHA512, TPM_ALG_SHA512},
26 {HASH_ALGO_SM3_256, TPM_ALG_SM3_256},
27};
28
29int tpm2_get_timeouts(struct tpm_chip *chip)
30{
31 /* Fixed timeouts for TPM2 */
32 chip->timeout_a = msecs_to_jiffies(m: TPM2_TIMEOUT_A);
33 chip->timeout_b = msecs_to_jiffies(m: TPM2_TIMEOUT_B);
34 chip->timeout_c = msecs_to_jiffies(m: TPM2_TIMEOUT_C);
35 chip->timeout_d = msecs_to_jiffies(m: TPM2_TIMEOUT_D);
36
37 /* PTP spec timeouts */
38 chip->duration[TPM_SHORT] = msecs_to_jiffies(m: TPM2_DURATION_SHORT);
39 chip->duration[TPM_MEDIUM] = msecs_to_jiffies(m: TPM2_DURATION_MEDIUM);
40 chip->duration[TPM_LONG] = msecs_to_jiffies(m: TPM2_DURATION_LONG);
41
42 /* Key creation commands long timeouts */
43 chip->duration[TPM_LONG_LONG] =
44 msecs_to_jiffies(m: TPM2_DURATION_LONG_LONG);
45
46 chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
47
48 return 0;
49}
50
51/**
52 * tpm2_ordinal_duration_index() - returns an index to the chip duration table
53 * @ordinal: TPM command ordinal.
54 *
55 * The function returns an index to the chip duration table
56 * (enum tpm_duration), that describes the maximum amount of
57 * time the chip could take to return the result for a particular ordinal.
58 *
59 * The values of the MEDIUM, and LONG durations are taken
60 * from the PC Client Profile (PTP) specification (750, 2000 msec)
61 *
62 * LONG_LONG is for commands that generates keys which empirically takes
63 * a longer time on some systems.
64 *
65 * Return:
66 * * TPM_MEDIUM
67 * * TPM_LONG
68 * * TPM_LONG_LONG
69 * * TPM_UNDEFINED
70 */
71static u8 tpm2_ordinal_duration_index(u32 ordinal)
72{
73 switch (ordinal) {
74 /* Startup */
75 case TPM2_CC_STARTUP: /* 144 */
76 return TPM_MEDIUM;
77
78 case TPM2_CC_SELF_TEST: /* 143 */
79 return TPM_LONG;
80
81 case TPM2_CC_GET_RANDOM: /* 17B */
82 return TPM_LONG;
83
84 case TPM2_CC_SEQUENCE_UPDATE: /* 15C */
85 return TPM_MEDIUM;
86 case TPM2_CC_SEQUENCE_COMPLETE: /* 13E */
87 return TPM_MEDIUM;
88 case TPM2_CC_EVENT_SEQUENCE_COMPLETE: /* 185 */
89 return TPM_MEDIUM;
90 case TPM2_CC_HASH_SEQUENCE_START: /* 186 */
91 return TPM_MEDIUM;
92
93 case TPM2_CC_VERIFY_SIGNATURE: /* 177 */
94 return TPM_LONG_LONG;
95
96 case TPM2_CC_PCR_EXTEND: /* 182 */
97 return TPM_MEDIUM;
98
99 case TPM2_CC_HIERARCHY_CONTROL: /* 121 */
100 return TPM_LONG;
101 case TPM2_CC_HIERARCHY_CHANGE_AUTH: /* 129 */
102 return TPM_LONG;
103
104 case TPM2_CC_GET_CAPABILITY: /* 17A */
105 return TPM_MEDIUM;
106
107 case TPM2_CC_NV_READ: /* 14E */
108 return TPM_LONG;
109
110 case TPM2_CC_CREATE_PRIMARY: /* 131 */
111 return TPM_LONG_LONG;
112 case TPM2_CC_CREATE: /* 153 */
113 return TPM_LONG_LONG;
114 case TPM2_CC_CREATE_LOADED: /* 191 */
115 return TPM_LONG_LONG;
116
117 default:
118 return TPM_UNDEFINED;
119 }
120}
121
122/**
123 * tpm2_calc_ordinal_duration() - calculate the maximum command duration
124 * @chip: TPM chip to use.
125 * @ordinal: TPM command ordinal.
126 *
127 * The function returns the maximum amount of time the chip could take
128 * to return the result for a particular ordinal in jiffies.
129 *
130 * Return: A maximal duration time for an ordinal in jiffies.
131 */
132unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
133{
134 unsigned int index;
135
136 index = tpm2_ordinal_duration_index(ordinal);
137
138 if (index != TPM_UNDEFINED)
139 return chip->duration[index];
140 else
141 return msecs_to_jiffies(m: TPM2_DURATION_DEFAULT);
142}
143
144
145struct tpm2_pcr_read_out {
146 __be32 update_cnt;
147 __be32 pcr_selects_cnt;
148 __be16 hash_alg;
149 u8 pcr_select_size;
150 u8 pcr_select[TPM2_PCR_SELECT_MIN];
151 __be32 digests_cnt;
152 __be16 digest_size;
153 u8 digest[];
154} __packed;
155
156/**
157 * tpm2_pcr_read() - read a PCR value
158 * @chip: TPM chip to use.
159 * @pcr_idx: index of the PCR to read.
160 * @digest: PCR bank and buffer current PCR value is written to.
161 * @digest_size_ptr: pointer to variable that stores the digest size.
162 *
163 * Return: Same as with tpm_transmit_cmd.
164 */
165int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
166 struct tpm_digest *digest, u16 *digest_size_ptr)
167{
168 int i;
169 int rc;
170 struct tpm_buf buf;
171 struct tpm2_pcr_read_out *out;
172 u8 pcr_select[TPM2_PCR_SELECT_MIN] = {0};
173 u16 digest_size;
174 u16 expected_digest_size = 0;
175
176 if (pcr_idx >= TPM2_PLATFORM_PCR)
177 return -EINVAL;
178
179 if (!digest_size_ptr) {
180 for (i = 0; i < chip->nr_allocated_banks &&
181 chip->allocated_banks[i].alg_id != digest->alg_id; i++)
182 ;
183
184 if (i == chip->nr_allocated_banks)
185 return -EINVAL;
186
187 expected_digest_size = chip->allocated_banks[i].digest_size;
188 }
189
190 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_PCR_READ);
191 if (rc)
192 return rc;
193
194 pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
195
196 tpm_buf_append_u32(buf: &buf, value: 1);
197 tpm_buf_append_u16(buf: &buf, value: digest->alg_id);
198 tpm_buf_append_u8(buf: &buf, value: TPM2_PCR_SELECT_MIN);
199 tpm_buf_append(buf: &buf, new_data: (const unsigned char *)pcr_select,
200 new_length: sizeof(pcr_select));
201
202 rc = tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 0, desc: "attempting to read a pcr value");
203 if (rc)
204 goto out;
205
206 out = (struct tpm2_pcr_read_out *)&buf.data[TPM_HEADER_SIZE];
207 digest_size = be16_to_cpu(out->digest_size);
208 if (digest_size > sizeof(digest->digest) ||
209 (!digest_size_ptr && digest_size != expected_digest_size)) {
210 rc = -EINVAL;
211 goto out;
212 }
213
214 if (digest_size_ptr)
215 *digest_size_ptr = digest_size;
216
217 memcpy(digest->digest, out->digest, digest_size);
218out:
219 tpm_buf_destroy(buf: &buf);
220 return rc;
221}
222
223/**
224 * tpm2_pcr_extend() - extend a PCR value
225 *
226 * @chip: TPM chip to use.
227 * @pcr_idx: index of the PCR.
228 * @digests: list of pcr banks and corresponding digest values to extend.
229 *
230 * Return: Same as with tpm_transmit_cmd.
231 */
232int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
233 struct tpm_digest *digests)
234{
235 struct tpm_buf buf;
236 int rc;
237 int i;
238
239 if (!disable_pcr_integrity) {
240 rc = tpm2_start_auth_session(chip);
241 if (rc)
242 return rc;
243 }
244
245 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_SESSIONS, ordinal: TPM2_CC_PCR_EXTEND);
246 if (rc) {
247 if (!disable_pcr_integrity)
248 tpm2_end_auth_session(chip);
249 return rc;
250 }
251
252 if (!disable_pcr_integrity) {
253 tpm_buf_append_name(chip, buf: &buf, handle: pcr_idx, NULL);
254 tpm_buf_append_hmac_session(chip, buf: &buf, attributes: 0, NULL, passphraselen: 0);
255 } else {
256 tpm_buf_append_handle(chip, buf: &buf, handle: pcr_idx);
257 tpm_buf_append_auth(chip, buf: &buf, attributes: 0, NULL, passphraselen: 0);
258 }
259
260 tpm_buf_append_u32(buf: &buf, value: chip->nr_allocated_banks);
261
262 for (i = 0; i < chip->nr_allocated_banks; i++) {
263 tpm_buf_append_u16(buf: &buf, value: digests[i].alg_id);
264 tpm_buf_append(buf: &buf, new_data: (const unsigned char *)&digests[i].digest,
265 new_length: chip->allocated_banks[i].digest_size);
266 }
267
268 if (!disable_pcr_integrity)
269 tpm_buf_fill_hmac_session(chip, buf: &buf);
270 rc = tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 0, desc: "attempting extend a PCR value");
271 if (!disable_pcr_integrity)
272 rc = tpm_buf_check_hmac_response(chip, buf: &buf, rc);
273
274 tpm_buf_destroy(buf: &buf);
275
276 return rc;
277}
278
279struct tpm2_get_random_out {
280 __be16 size;
281 u8 buffer[TPM_MAX_RNG_DATA];
282} __packed;
283
284/**
285 * tpm2_get_random() - get random bytes from the TPM RNG
286 *
287 * @chip: a &tpm_chip instance
288 * @dest: destination buffer
289 * @max: the max number of random bytes to pull
290 *
291 * Return:
292 * size of the buffer on success,
293 * -errno otherwise (positive TPM return codes are masked to -EIO)
294 */
295int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
296{
297 struct tpm2_get_random_out *out;
298 struct tpm_header *head;
299 struct tpm_buf buf;
300 u32 recd;
301 u32 num_bytes = max;
302 int err;
303 int total = 0;
304 int retries = 5;
305 u8 *dest_ptr = dest;
306 off_t offset;
307
308 if (!num_bytes || max > TPM_MAX_RNG_DATA)
309 return -EINVAL;
310
311 err = tpm2_start_auth_session(chip);
312 if (err)
313 return err;
314
315 err = tpm_buf_init(buf: &buf, tag: 0, ordinal: 0);
316 if (err) {
317 tpm2_end_auth_session(chip);
318 return err;
319 }
320
321 do {
322 tpm_buf_reset(buf: &buf, tag: TPM2_ST_SESSIONS, ordinal: TPM2_CC_GET_RANDOM);
323 tpm_buf_append_hmac_session_opt(chip, buf: &buf, attributes: TPM2_SA_ENCRYPT
324 | TPM2_SA_CONTINUE_SESSION,
325 NULL, passphraselen: 0);
326 tpm_buf_append_u16(buf: &buf, value: num_bytes);
327 tpm_buf_fill_hmac_session(chip, buf: &buf);
328 err = tpm_transmit_cmd(chip, buf: &buf,
329 offsetof(struct tpm2_get_random_out,
330 buffer),
331 desc: "attempting get random");
332 err = tpm_buf_check_hmac_response(chip, buf: &buf, rc: err);
333 if (err) {
334 if (err > 0)
335 err = -EIO;
336 goto out;
337 }
338
339 head = (struct tpm_header *)buf.data;
340 offset = TPM_HEADER_SIZE;
341 /* Skip the parameter size field: */
342 if (be16_to_cpu(head->tag) == TPM2_ST_SESSIONS)
343 offset += 4;
344
345 out = (struct tpm2_get_random_out *)&buf.data[offset];
346 recd = min_t(u32, be16_to_cpu(out->size), num_bytes);
347 if (tpm_buf_length(buf: &buf) <
348 TPM_HEADER_SIZE +
349 offsetof(struct tpm2_get_random_out, buffer) +
350 recd) {
351 err = -EFAULT;
352 goto out;
353 }
354 memcpy(dest_ptr, out->buffer, recd);
355
356 dest_ptr += recd;
357 total += recd;
358 num_bytes -= recd;
359 } while (retries-- && total < max);
360
361 tpm_buf_destroy(buf: &buf);
362
363 return total ? total : -EIO;
364out:
365 tpm_buf_destroy(buf: &buf);
366 tpm2_end_auth_session(chip);
367 return err;
368}
369
370/**
371 * tpm2_flush_context() - execute a TPM2_FlushContext command
372 * @chip: TPM chip to use
373 * @handle: context handle
374 */
375void tpm2_flush_context(struct tpm_chip *chip, u32 handle)
376{
377 struct tpm_buf buf;
378 int rc;
379
380 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_FLUSH_CONTEXT);
381 if (rc) {
382 dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n",
383 handle);
384 return;
385 }
386
387 tpm_buf_append_u32(buf: &buf, value: handle);
388
389 tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 0, desc: "flushing context");
390 tpm_buf_destroy(buf: &buf);
391}
392EXPORT_SYMBOL_GPL(tpm2_flush_context);
393
394struct tpm2_get_cap_out {
395 u8 more_data;
396 __be32 subcap_id;
397 __be32 property_cnt;
398 __be32 property_id;
399 __be32 value;
400} __packed;
401
402/**
403 * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property
404 * @chip: a &tpm_chip instance
405 * @property_id: property ID.
406 * @value: output variable.
407 * @desc: passed to tpm_transmit_cmd()
408 *
409 * Return:
410 * 0 on success,
411 * -errno or a TPM return code otherwise
412 */
413ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
414 const char *desc)
415{
416 struct tpm2_get_cap_out *out;
417 struct tpm_buf buf;
418 int rc;
419
420 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_GET_CAPABILITY);
421 if (rc)
422 return rc;
423 tpm_buf_append_u32(buf: &buf, value: TPM2_CAP_TPM_PROPERTIES);
424 tpm_buf_append_u32(buf: &buf, value: property_id);
425 tpm_buf_append_u32(buf: &buf, value: 1);
426 rc = tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 0, NULL);
427 if (!rc) {
428 out = (struct tpm2_get_cap_out *)
429 &buf.data[TPM_HEADER_SIZE];
430 /*
431 * To prevent failing boot up of some systems, Infineon TPM2.0
432 * returns SUCCESS on TPM2_Startup in field upgrade mode. Also
433 * the TPM2_Getcapability command returns a zero length list
434 * in field upgrade mode.
435 */
436 if (be32_to_cpu(out->property_cnt) > 0)
437 *value = be32_to_cpu(out->value);
438 else
439 rc = -ENODATA;
440 }
441 tpm_buf_destroy(buf: &buf);
442 return rc;
443}
444EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt);
445
446/**
447 * tpm2_shutdown() - send a TPM shutdown command
448 *
449 * Sends a TPM shutdown command. The shutdown command is used in call
450 * sites where the system is going down. If it fails, there is not much
451 * that can be done except print an error message.
452 *
453 * @chip: a &tpm_chip instance
454 * @shutdown_type: TPM_SU_CLEAR or TPM_SU_STATE.
455 */
456void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
457{
458 struct tpm_buf buf;
459 int rc;
460
461 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_SHUTDOWN);
462 if (rc)
463 return;
464 tpm_buf_append_u16(buf: &buf, value: shutdown_type);
465 tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 0, desc: "stopping the TPM");
466 tpm_buf_destroy(buf: &buf);
467}
468
469/**
470 * tpm2_do_selftest() - ensure that all self tests have passed
471 *
472 * @chip: TPM chip to use
473 *
474 * Return: Same as with tpm_transmit_cmd.
475 *
476 * The TPM can either run all self tests synchronously and then return
477 * RC_SUCCESS once all tests were successful. Or it can choose to run the tests
478 * asynchronously and return RC_TESTING immediately while the self tests still
479 * execute in the background. This function handles both cases and waits until
480 * all tests have completed.
481 */
482static int tpm2_do_selftest(struct tpm_chip *chip)
483{
484 struct tpm_buf buf;
485 int full;
486 int rc;
487
488 for (full = 0; full < 2; full++) {
489 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_SELF_TEST);
490 if (rc)
491 return rc;
492
493 tpm_buf_append_u8(buf: &buf, value: full);
494 rc = tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 0,
495 desc: "attempting the self test");
496 tpm_buf_destroy(buf: &buf);
497
498 if (rc == TPM2_RC_TESTING)
499 rc = TPM2_RC_SUCCESS;
500 if (rc == TPM2_RC_INITIALIZE || rc == TPM2_RC_SUCCESS)
501 return rc;
502 }
503
504 return rc;
505}
506
507/**
508 * tpm2_probe() - probe for the TPM 2.0 protocol
509 * @chip: a &tpm_chip instance
510 *
511 * Send an idempotent TPM 2.0 command and see whether there is TPM2 chip in the
512 * other end based on the response tag. The flag TPM_CHIP_FLAG_TPM2 is set by
513 * this function if this is the case.
514 *
515 * Return:
516 * 0 on success,
517 * -errno otherwise
518 */
519int tpm2_probe(struct tpm_chip *chip)
520{
521 struct tpm_header *out;
522 struct tpm_buf buf;
523 int rc;
524
525 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_GET_CAPABILITY);
526 if (rc)
527 return rc;
528 tpm_buf_append_u32(buf: &buf, value: TPM2_CAP_TPM_PROPERTIES);
529 tpm_buf_append_u32(buf: &buf, value: TPM_PT_TOTAL_COMMANDS);
530 tpm_buf_append_u32(buf: &buf, value: 1);
531 rc = tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 0, NULL);
532 /* We ignore TPM return codes on purpose. */
533 if (rc >= 0) {
534 out = (struct tpm_header *)buf.data;
535 if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS)
536 chip->flags |= TPM_CHIP_FLAG_TPM2;
537 }
538 tpm_buf_destroy(buf: &buf);
539 return 0;
540}
541EXPORT_SYMBOL_GPL(tpm2_probe);
542
543static int tpm2_init_bank_info(struct tpm_chip *chip, u32 bank_index)
544{
545 struct tpm_bank_info *bank = chip->allocated_banks + bank_index;
546 struct tpm_digest digest = { .alg_id = bank->alg_id };
547 int i;
548
549 /*
550 * Avoid unnecessary PCR read operations to reduce overhead
551 * and obtain identifiers of the crypto subsystem.
552 */
553 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
554 enum hash_algo crypto_algo = tpm2_hash_map[i].crypto_id;
555
556 if (bank->alg_id != tpm2_hash_map[i].tpm_id)
557 continue;
558
559 bank->digest_size = hash_digest_size[crypto_algo];
560 bank->crypto_id = crypto_algo;
561 return 0;
562 }
563
564 bank->crypto_id = HASH_ALGO__LAST;
565
566 return tpm2_pcr_read(chip, pcr_idx: 0, digest: &digest, digest_size_ptr: &bank->digest_size);
567}
568
569struct tpm2_pcr_selection {
570 __be16 hash_alg;
571 u8 size_of_select;
572 u8 pcr_select[3];
573} __packed;
574
575ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
576{
577 struct tpm2_pcr_selection pcr_selection;
578 struct tpm_buf buf;
579 void *marker;
580 void *end;
581 void *pcr_select_offset;
582 u32 sizeof_pcr_selection;
583 u32 nr_possible_banks;
584 u32 nr_alloc_banks = 0;
585 u16 hash_alg;
586 u32 rsp_len;
587 int rc;
588 int i = 0;
589
590 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_GET_CAPABILITY);
591 if (rc)
592 return rc;
593
594 tpm_buf_append_u32(buf: &buf, value: TPM2_CAP_PCRS);
595 tpm_buf_append_u32(buf: &buf, value: 0);
596 tpm_buf_append_u32(buf: &buf, value: 1);
597
598 rc = tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 9, desc: "get tpm pcr allocation");
599 if (rc)
600 goto out;
601
602 nr_possible_banks = be32_to_cpup(
603 p: (__be32 *)&buf.data[TPM_HEADER_SIZE + 5]);
604
605 chip->allocated_banks = kcalloc(nr_possible_banks,
606 sizeof(*chip->allocated_banks),
607 GFP_KERNEL);
608 if (!chip->allocated_banks) {
609 rc = -ENOMEM;
610 goto out;
611 }
612
613 marker = &buf.data[TPM_HEADER_SIZE + 9];
614
615 rsp_len = be32_to_cpup(p: (__be32 *)&buf.data[2]);
616 end = &buf.data[rsp_len];
617
618 for (i = 0; i < nr_possible_banks; i++) {
619 pcr_select_offset = marker +
620 offsetof(struct tpm2_pcr_selection, size_of_select);
621 if (pcr_select_offset >= end) {
622 rc = -EFAULT;
623 break;
624 }
625
626 memcpy(&pcr_selection, marker, sizeof(pcr_selection));
627 hash_alg = be16_to_cpu(pcr_selection.hash_alg);
628
629 pcr_select_offset = memchr_inv(p: pcr_selection.pcr_select, c: 0,
630 size: pcr_selection.size_of_select);
631 if (pcr_select_offset) {
632 chip->allocated_banks[nr_alloc_banks].alg_id = hash_alg;
633
634 rc = tpm2_init_bank_info(chip, bank_index: nr_alloc_banks);
635 if (rc < 0)
636 break;
637
638 nr_alloc_banks++;
639 }
640
641 sizeof_pcr_selection = sizeof(pcr_selection.hash_alg) +
642 sizeof(pcr_selection.size_of_select) +
643 pcr_selection.size_of_select;
644 marker = marker + sizeof_pcr_selection;
645 }
646
647 chip->nr_allocated_banks = nr_alloc_banks;
648out:
649 tpm_buf_destroy(buf: &buf);
650
651 return rc;
652}
653
654int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
655{
656 struct tpm_buf buf;
657 u32 nr_commands;
658 __be32 *attrs;
659 u32 cc;
660 int i;
661 int rc;
662
663 rc = tpm2_get_tpm_pt(chip, TPM_PT_TOTAL_COMMANDS, &nr_commands, NULL);
664 if (rc)
665 goto out;
666
667 if (nr_commands > 0xFFFFF) {
668 rc = -EFAULT;
669 goto out;
670 }
671
672 chip->cc_attrs_tbl = devm_kcalloc(dev: &chip->dev, n: 4, size: nr_commands,
673 GFP_KERNEL);
674 if (!chip->cc_attrs_tbl) {
675 rc = -ENOMEM;
676 goto out;
677 }
678
679 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_GET_CAPABILITY);
680 if (rc)
681 goto out;
682
683 tpm_buf_append_u32(buf: &buf, value: TPM2_CAP_COMMANDS);
684 tpm_buf_append_u32(buf: &buf, value: TPM2_CC_FIRST);
685 tpm_buf_append_u32(buf: &buf, value: nr_commands);
686
687 rc = tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 9 + 4 * nr_commands, NULL);
688 if (rc) {
689 tpm_buf_destroy(buf: &buf);
690 goto out;
691 }
692
693 if (nr_commands !=
694 be32_to_cpup(p: (__be32 *)&buf.data[TPM_HEADER_SIZE + 5])) {
695 rc = -EFAULT;
696 tpm_buf_destroy(buf: &buf);
697 goto out;
698 }
699
700 chip->nr_commands = nr_commands;
701
702 attrs = (__be32 *)&buf.data[TPM_HEADER_SIZE + 9];
703 for (i = 0; i < nr_commands; i++, attrs++) {
704 chip->cc_attrs_tbl[i] = be32_to_cpup(p: attrs);
705 cc = chip->cc_attrs_tbl[i] & 0xFFFF;
706
707 if (cc == TPM2_CC_CONTEXT_SAVE || cc == TPM2_CC_FLUSH_CONTEXT) {
708 chip->cc_attrs_tbl[i] &=
709 ~(GENMASK(2, 0) << TPM2_CC_ATTR_CHANDLES);
710 chip->cc_attrs_tbl[i] |= 1 << TPM2_CC_ATTR_CHANDLES;
711 }
712 }
713
714 tpm_buf_destroy(buf: &buf);
715
716out:
717 if (rc > 0)
718 rc = -ENODEV;
719 return rc;
720}
721EXPORT_SYMBOL_GPL(tpm2_get_cc_attrs_tbl);
722
723/**
724 * tpm2_startup - turn on the TPM
725 * @chip: TPM chip to use
726 *
727 * Normally the firmware should start the TPM. This function is provided as a
728 * workaround if this does not happen. A legal case for this could be for
729 * example when a TPM emulator is used.
730 *
731 * Return: same as tpm_transmit_cmd()
732 */
733
734static int tpm2_startup(struct tpm_chip *chip)
735{
736 struct tpm_buf buf;
737 int rc;
738
739 dev_info(&chip->dev, "starting up the TPM manually\n");
740
741 rc = tpm_buf_init(buf: &buf, tag: TPM2_ST_NO_SESSIONS, ordinal: TPM2_CC_STARTUP);
742 if (rc < 0)
743 return rc;
744
745 tpm_buf_append_u16(buf: &buf, value: TPM2_SU_CLEAR);
746 rc = tpm_transmit_cmd(chip, buf: &buf, min_rsp_body_length: 0, desc: "attempting to start the TPM");
747 tpm_buf_destroy(buf: &buf);
748
749 return rc;
750}
751
752/**
753 * tpm2_auto_startup - Perform the standard automatic TPM initialization
754 * sequence
755 * @chip: TPM chip to use
756 *
757 * Returns 0 on success, < 0 in case of fatal error.
758 */
759int tpm2_auto_startup(struct tpm_chip *chip)
760{
761 int rc;
762
763 rc = tpm2_get_timeouts(chip);
764 if (rc)
765 goto out;
766
767 rc = tpm2_do_selftest(chip);
768 if (rc && rc != TPM2_RC_INITIALIZE)
769 goto out;
770
771 if (rc == TPM2_RC_INITIALIZE) {
772 rc = tpm2_startup(chip);
773 if (rc)
774 goto out;
775
776 rc = tpm2_do_selftest(chip);
777 if (rc)
778 goto out;
779 }
780
781 rc = tpm2_get_cc_attrs_tbl(chip);
782 if (rc == TPM2_RC_FAILURE || (rc < 0 && rc != -ENOMEM)) {
783 dev_info(&chip->dev,
784 "TPM in field failure mode, requires firmware upgrade\n");
785 chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE;
786 rc = 0;
787 }
788
789 if (rc)
790 goto out;
791
792 rc = tpm2_sessions_init(chip);
793
794out:
795 /*
796 * Infineon TPM in field upgrade mode will return no data for the number
797 * of supported commands.
798 */
799 if (rc == TPM2_RC_UPGRADE || rc == -ENODATA) {
800 dev_info(&chip->dev, "TPM in field upgrade mode, requires firmware upgrade\n");
801 chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE;
802 rc = 0;
803 }
804
805 if (rc > 0)
806 rc = -ENODEV;
807 return rc;
808}
809
810int tpm2_find_cc(struct tpm_chip *chip, u32 cc)
811{
812 u32 cc_mask;
813 int i;
814
815 cc_mask = 1 << TPM2_CC_ATTR_VENDOR | GENMASK(15, 0);
816 for (i = 0; i < chip->nr_commands; i++)
817 if (cc == (chip->cc_attrs_tbl[i] & cc_mask))
818 return i;
819
820 return -1;
821}
822

source code of linux/drivers/char/tpm/tpm2-cmd.c