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 17 static bool disable_pcr_integrity; 18 module_param(disable_pcr_integrity, bool, 0444); 19 MODULE_PARM_DESC(disable_pcr_integrity, "Disable integrity protection of TPM2_PCR_Extend"); 20 21 static 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 29 int tpm2_get_timeouts(struct tpm_chip *chip) 30 { 31 /* Fixed timeouts for TPM2 */ 32 chip->timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A); 33 chip->timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B); 34 chip->timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C); 35 chip->timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D); 36 37 /* PTP spec timeouts */ 38 chip->duration[TPM_SHORT] = msecs_to_jiffies(TPM2_DURATION_SHORT); 39 chip->duration[TPM_MEDIUM] = msecs_to_jiffies(TPM2_DURATION_MEDIUM); 40 chip->duration[TPM_LONG] = msecs_to_jiffies(TPM2_DURATION_LONG); 41 42 /* Key creation commands long timeouts */ 43 chip->duration[TPM_LONG_LONG] = 44 msecs_to_jiffies(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 */ 71 static 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 */ 132 unsigned 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(TPM2_DURATION_DEFAULT); 142 } 143 144 145 struct 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 */ 165 int 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, TPM2_ST_NO_SESSIONS, 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, 1); 197 tpm_buf_append_u16(&buf, digest->alg_id); 198 tpm_buf_append_u8(&buf, TPM2_PCR_SELECT_MIN); 199 tpm_buf_append(&buf, (const unsigned char *)pcr_select, 200 sizeof(pcr_select)); 201 202 rc = tpm_transmit_cmd(chip, &buf, 0, "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); 218 out: 219 tpm_buf_destroy(&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 */ 232 int 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, TPM2_ST_SESSIONS, 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, pcr_idx, NULL); 254 tpm_buf_append_hmac_session(chip, &buf, 0, NULL, 0); 255 } else { 256 tpm_buf_append_handle(chip, &buf, pcr_idx); 257 tpm_buf_append_auth(chip, &buf, 0, NULL, 0); 258 } 259 260 tpm_buf_append_u32(&buf, chip->nr_allocated_banks); 261 262 for (i = 0; i < chip->nr_allocated_banks; i++) { 263 tpm_buf_append_u16(&buf, digests[i].alg_id); 264 tpm_buf_append(&buf, (const unsigned char *)&digests[i].digest, 265 chip->allocated_banks[i].digest_size); 266 } 267 268 if (!disable_pcr_integrity) 269 tpm_buf_fill_hmac_session(chip, &buf); 270 rc = tpm_transmit_cmd(chip, &buf, 0, "attempting extend a PCR value"); 271 if (!disable_pcr_integrity) 272 rc = tpm_buf_check_hmac_response(chip, &buf, rc); 273 274 tpm_buf_destroy(&buf); 275 276 return rc; 277 } 278 279 struct 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 */ 295 int 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, 0, 0); 316 if (err) { 317 tpm2_end_auth_session(chip); 318 return err; 319 } 320 321 do { 322 tpm_buf_reset(&buf, TPM2_ST_SESSIONS, TPM2_CC_GET_RANDOM); 323 tpm_buf_append_hmac_session_opt(chip, &buf, TPM2_SA_ENCRYPT 324 | TPM2_SA_CONTINUE_SESSION, 325 NULL, 0); 326 tpm_buf_append_u16(&buf, num_bytes); 327 tpm_buf_fill_hmac_session(chip, &buf); 328 err = tpm_transmit_cmd(chip, &buf, 329 offsetof(struct tpm2_get_random_out, 330 buffer), 331 "attempting get random"); 332 err = tpm_buf_check_hmac_response(chip, &buf, 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) < 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); 362 tpm2_end_auth_session(chip); 363 364 return total ? total : -EIO; 365 out: 366 tpm_buf_destroy(&buf); 367 tpm2_end_auth_session(chip); 368 return err; 369 } 370 371 /** 372 * tpm2_flush_context() - execute a TPM2_FlushContext command 373 * @chip: TPM chip to use 374 * @handle: context handle 375 */ 376 void tpm2_flush_context(struct tpm_chip *chip, u32 handle) 377 { 378 struct tpm_buf buf; 379 int rc; 380 381 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT); 382 if (rc) { 383 dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n", 384 handle); 385 return; 386 } 387 388 tpm_buf_append_u32(&buf, handle); 389 390 tpm_transmit_cmd(chip, &buf, 0, "flushing context"); 391 tpm_buf_destroy(&buf); 392 } 393 EXPORT_SYMBOL_GPL(tpm2_flush_context); 394 395 struct tpm2_get_cap_out { 396 u8 more_data; 397 __be32 subcap_id; 398 __be32 property_cnt; 399 __be32 property_id; 400 __be32 value; 401 } __packed; 402 403 /** 404 * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property 405 * @chip: a &tpm_chip instance 406 * @property_id: property ID. 407 * @value: output variable. 408 * @desc: passed to tpm_transmit_cmd() 409 * 410 * Return: 411 * 0 on success, 412 * -errno or a TPM return code otherwise 413 */ 414 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value, 415 const char *desc) 416 { 417 struct tpm2_get_cap_out *out; 418 struct tpm_buf buf; 419 int rc; 420 421 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); 422 if (rc) 423 return rc; 424 tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES); 425 tpm_buf_append_u32(&buf, property_id); 426 tpm_buf_append_u32(&buf, 1); 427 rc = tpm_transmit_cmd(chip, &buf, 0, NULL); 428 if (!rc) { 429 out = (struct tpm2_get_cap_out *) 430 &buf.data[TPM_HEADER_SIZE]; 431 /* 432 * To prevent failing boot up of some systems, Infineon TPM2.0 433 * returns SUCCESS on TPM2_Startup in field upgrade mode. Also 434 * the TPM2_Getcapability command returns a zero length list 435 * in field upgrade mode. 436 */ 437 if (be32_to_cpu(out->property_cnt) > 0) 438 *value = be32_to_cpu(out->value); 439 else 440 rc = -ENODATA; 441 } 442 tpm_buf_destroy(&buf); 443 return rc; 444 } 445 EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt); 446 447 /** 448 * tpm2_shutdown() - send a TPM shutdown command 449 * 450 * Sends a TPM shutdown command. The shutdown command is used in call 451 * sites where the system is going down. If it fails, there is not much 452 * that can be done except print an error message. 453 * 454 * @chip: a &tpm_chip instance 455 * @shutdown_type: TPM_SU_CLEAR or TPM_SU_STATE. 456 */ 457 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type) 458 { 459 struct tpm_buf buf; 460 int rc; 461 462 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SHUTDOWN); 463 if (rc) 464 return; 465 tpm_buf_append_u16(&buf, shutdown_type); 466 tpm_transmit_cmd(chip, &buf, 0, "stopping the TPM"); 467 tpm_buf_destroy(&buf); 468 } 469 470 /** 471 * tpm2_do_selftest() - ensure that all self tests have passed 472 * 473 * @chip: TPM chip to use 474 * 475 * Return: Same as with tpm_transmit_cmd. 476 * 477 * The TPM can either run all self tests synchronously and then return 478 * RC_SUCCESS once all tests were successful. Or it can choose to run the tests 479 * asynchronously and return RC_TESTING immediately while the self tests still 480 * execute in the background. This function handles both cases and waits until 481 * all tests have completed. 482 */ 483 static int tpm2_do_selftest(struct tpm_chip *chip) 484 { 485 struct tpm_buf buf; 486 int full; 487 int rc; 488 489 for (full = 0; full < 2; full++) { 490 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SELF_TEST); 491 if (rc) 492 return rc; 493 494 tpm_buf_append_u8(&buf, full); 495 rc = tpm_transmit_cmd(chip, &buf, 0, 496 "attempting the self test"); 497 tpm_buf_destroy(&buf); 498 499 if (rc == TPM2_RC_TESTING) 500 rc = TPM2_RC_SUCCESS; 501 if (rc == TPM2_RC_INITIALIZE || rc == TPM2_RC_SUCCESS) 502 return rc; 503 } 504 505 return rc; 506 } 507 508 /** 509 * tpm2_probe() - probe for the TPM 2.0 protocol 510 * @chip: a &tpm_chip instance 511 * 512 * Send an idempotent TPM 2.0 command and see whether there is TPM2 chip in the 513 * other end based on the response tag. The flag TPM_CHIP_FLAG_TPM2 is set by 514 * this function if this is the case. 515 * 516 * Return: 517 * 0 on success, 518 * -errno otherwise 519 */ 520 int tpm2_probe(struct tpm_chip *chip) 521 { 522 struct tpm_header *out; 523 struct tpm_buf buf; 524 int rc; 525 526 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); 527 if (rc) 528 return rc; 529 tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES); 530 tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS); 531 tpm_buf_append_u32(&buf, 1); 532 rc = tpm_transmit_cmd(chip, &buf, 0, NULL); 533 /* We ignore TPM return codes on purpose. */ 534 if (rc >= 0) { 535 out = (struct tpm_header *)buf.data; 536 if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS) 537 chip->flags |= TPM_CHIP_FLAG_TPM2; 538 } 539 tpm_buf_destroy(&buf); 540 return 0; 541 } 542 EXPORT_SYMBOL_GPL(tpm2_probe); 543 544 static int tpm2_init_bank_info(struct tpm_chip *chip, u32 bank_index) 545 { 546 struct tpm_bank_info *bank = chip->allocated_banks + bank_index; 547 struct tpm_digest digest = { .alg_id = bank->alg_id }; 548 int i; 549 550 /* 551 * Avoid unnecessary PCR read operations to reduce overhead 552 * and obtain identifiers of the crypto subsystem. 553 */ 554 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) { 555 enum hash_algo crypto_algo = tpm2_hash_map[i].crypto_id; 556 557 if (bank->alg_id != tpm2_hash_map[i].tpm_id) 558 continue; 559 560 bank->digest_size = hash_digest_size[crypto_algo]; 561 bank->crypto_id = crypto_algo; 562 return 0; 563 } 564 565 bank->crypto_id = HASH_ALGO__LAST; 566 567 return tpm2_pcr_read(chip, 0, &digest, &bank->digest_size); 568 } 569 570 struct tpm2_pcr_selection { 571 __be16 hash_alg; 572 u8 size_of_select; 573 u8 pcr_select[3]; 574 } __packed; 575 576 ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip) 577 { 578 struct tpm2_pcr_selection pcr_selection; 579 struct tpm_buf buf; 580 void *marker; 581 void *end; 582 void *pcr_select_offset; 583 u32 sizeof_pcr_selection; 584 u32 nr_possible_banks; 585 u32 nr_alloc_banks = 0; 586 u16 hash_alg; 587 u32 rsp_len; 588 int rc; 589 int i = 0; 590 591 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); 592 if (rc) 593 return rc; 594 595 tpm_buf_append_u32(&buf, TPM2_CAP_PCRS); 596 tpm_buf_append_u32(&buf, 0); 597 tpm_buf_append_u32(&buf, 1); 598 599 rc = tpm_transmit_cmd(chip, &buf, 9, "get tpm pcr allocation"); 600 if (rc) 601 goto out; 602 603 nr_possible_banks = be32_to_cpup( 604 (__be32 *)&buf.data[TPM_HEADER_SIZE + 5]); 605 606 chip->allocated_banks = kcalloc(nr_possible_banks, 607 sizeof(*chip->allocated_banks), 608 GFP_KERNEL); 609 if (!chip->allocated_banks) { 610 rc = -ENOMEM; 611 goto out; 612 } 613 614 marker = &buf.data[TPM_HEADER_SIZE + 9]; 615 616 rsp_len = be32_to_cpup((__be32 *)&buf.data[2]); 617 end = &buf.data[rsp_len]; 618 619 for (i = 0; i < nr_possible_banks; i++) { 620 pcr_select_offset = marker + 621 offsetof(struct tpm2_pcr_selection, size_of_select); 622 if (pcr_select_offset >= end) { 623 rc = -EFAULT; 624 break; 625 } 626 627 memcpy(&pcr_selection, marker, sizeof(pcr_selection)); 628 hash_alg = be16_to_cpu(pcr_selection.hash_alg); 629 630 pcr_select_offset = memchr_inv(pcr_selection.pcr_select, 0, 631 pcr_selection.size_of_select); 632 if (pcr_select_offset) { 633 chip->allocated_banks[nr_alloc_banks].alg_id = hash_alg; 634 635 rc = tpm2_init_bank_info(chip, nr_alloc_banks); 636 if (rc < 0) 637 break; 638 639 nr_alloc_banks++; 640 } 641 642 sizeof_pcr_selection = sizeof(pcr_selection.hash_alg) + 643 sizeof(pcr_selection.size_of_select) + 644 pcr_selection.size_of_select; 645 marker = marker + sizeof_pcr_selection; 646 } 647 648 chip->nr_allocated_banks = nr_alloc_banks; 649 out: 650 tpm_buf_destroy(&buf); 651 652 return rc; 653 } 654 655 int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip) 656 { 657 struct tpm_buf buf; 658 u32 nr_commands; 659 __be32 *attrs; 660 u32 cc; 661 int i; 662 int rc; 663 664 rc = tpm2_get_tpm_pt(chip, TPM_PT_TOTAL_COMMANDS, &nr_commands, NULL); 665 if (rc) 666 goto out; 667 668 if (nr_commands > 0xFFFFF) { 669 rc = -EFAULT; 670 goto out; 671 } 672 673 chip->cc_attrs_tbl = devm_kcalloc(&chip->dev, 4, nr_commands, 674 GFP_KERNEL); 675 if (!chip->cc_attrs_tbl) { 676 rc = -ENOMEM; 677 goto out; 678 } 679 680 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); 681 if (rc) 682 goto out; 683 684 tpm_buf_append_u32(&buf, TPM2_CAP_COMMANDS); 685 tpm_buf_append_u32(&buf, TPM2_CC_FIRST); 686 tpm_buf_append_u32(&buf, nr_commands); 687 688 rc = tpm_transmit_cmd(chip, &buf, 9 + 4 * nr_commands, NULL); 689 if (rc) { 690 tpm_buf_destroy(&buf); 691 goto out; 692 } 693 694 if (nr_commands != 695 be32_to_cpup((__be32 *)&buf.data[TPM_HEADER_SIZE + 5])) { 696 rc = -EFAULT; 697 tpm_buf_destroy(&buf); 698 goto out; 699 } 700 701 chip->nr_commands = nr_commands; 702 703 attrs = (__be32 *)&buf.data[TPM_HEADER_SIZE + 9]; 704 for (i = 0; i < nr_commands; i++, attrs++) { 705 chip->cc_attrs_tbl[i] = be32_to_cpup(attrs); 706 cc = chip->cc_attrs_tbl[i] & 0xFFFF; 707 708 if (cc == TPM2_CC_CONTEXT_SAVE || cc == TPM2_CC_FLUSH_CONTEXT) { 709 chip->cc_attrs_tbl[i] &= 710 ~(GENMASK(2, 0) << TPM2_CC_ATTR_CHANDLES); 711 chip->cc_attrs_tbl[i] |= 1 << TPM2_CC_ATTR_CHANDLES; 712 } 713 } 714 715 tpm_buf_destroy(&buf); 716 717 out: 718 if (rc > 0) 719 rc = -ENODEV; 720 return rc; 721 } 722 EXPORT_SYMBOL_GPL(tpm2_get_cc_attrs_tbl); 723 724 /** 725 * tpm2_startup - turn on the TPM 726 * @chip: TPM chip to use 727 * 728 * Normally the firmware should start the TPM. This function is provided as a 729 * workaround if this does not happen. A legal case for this could be for 730 * example when a TPM emulator is used. 731 * 732 * Return: same as tpm_transmit_cmd() 733 */ 734 735 static int tpm2_startup(struct tpm_chip *chip) 736 { 737 struct tpm_buf buf; 738 int rc; 739 740 dev_info(&chip->dev, "starting up the TPM manually\n"); 741 742 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_STARTUP); 743 if (rc < 0) 744 return rc; 745 746 tpm_buf_append_u16(&buf, TPM2_SU_CLEAR); 747 rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to start the TPM"); 748 tpm_buf_destroy(&buf); 749 750 return rc; 751 } 752 753 /** 754 * tpm2_auto_startup - Perform the standard automatic TPM initialization 755 * sequence 756 * @chip: TPM chip to use 757 * 758 * Returns 0 on success, < 0 in case of fatal error. 759 */ 760 int tpm2_auto_startup(struct tpm_chip *chip) 761 { 762 int rc; 763 764 rc = tpm2_get_timeouts(chip); 765 if (rc) 766 goto out; 767 768 rc = tpm2_do_selftest(chip); 769 if (rc && rc != TPM2_RC_INITIALIZE) 770 goto out; 771 772 if (rc == TPM2_RC_INITIALIZE) { 773 rc = tpm2_startup(chip); 774 if (rc) 775 goto out; 776 777 rc = tpm2_do_selftest(chip); 778 if (rc) 779 goto out; 780 } 781 782 rc = tpm2_get_cc_attrs_tbl(chip); 783 if (rc == TPM2_RC_FAILURE || (rc < 0 && rc != -ENOMEM)) { 784 dev_info(&chip->dev, 785 "TPM in field failure mode, requires firmware upgrade\n"); 786 chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE; 787 rc = 0; 788 } 789 790 if (rc) 791 goto out; 792 793 rc = tpm2_sessions_init(chip); 794 795 out: 796 /* 797 * Infineon TPM in field upgrade mode will return no data for the number 798 * of supported commands. 799 */ 800 if (rc == TPM2_RC_UPGRADE || rc == -ENODATA) { 801 dev_info(&chip->dev, "TPM in field upgrade mode, requires firmware upgrade\n"); 802 chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE; 803 rc = 0; 804 } 805 806 if (rc > 0) 807 rc = -ENODEV; 808 return rc; 809 } 810 811 int tpm2_find_cc(struct tpm_chip *chip, u32 cc) 812 { 813 u32 cc_mask; 814 int i; 815 816 cc_mask = 1 << TPM2_CC_ATTR_VENDOR | GENMASK(15, 0); 817 for (i = 0; i < chip->nr_commands; i++) 818 if (cc == (chip->cc_attrs_tbl[i] & cc_mask)) 819 return i; 820 821 return -1; 822 } 823