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 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 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 */ 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 */ 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 */ 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 */ 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 tpm2_end_auth_session(chip); 286 return err; 287 } 288 289 err = tpm_transmit_cmd(chip, buf, 290 offsetof(struct tpm2_get_random_out, 291 buffer), 292 "attempting get random"); 293 err = tpm_buf_check_hmac_response(chip, buf, err); 294 if (err) { 295 if (err > 0) 296 err = -EIO; 297 tpm2_end_auth_session(chip); 298 return err; 299 } 300 301 head = (struct tpm_header *)buf->data; 302 offset = TPM_HEADER_SIZE; 303 /* Skip the parameter size field: */ 304 if (be16_to_cpu(head->tag) == TPM2_ST_SESSIONS) 305 offset += 4; 306 307 out = (struct tpm2_get_random_out *)&buf->data[offset]; 308 recd = min_t(u32, be16_to_cpu(out->size), num_bytes); 309 if (tpm_buf_length(buf) < 310 offset + 311 offsetof(struct tpm2_get_random_out, buffer) + 312 recd) { 313 tpm2_end_auth_session(chip); 314 return -EFAULT; 315 } 316 memcpy(dest_ptr, out->buffer, recd); 317 318 dest_ptr += recd; 319 total += recd; 320 num_bytes -= recd; 321 } while (retries-- && total < max); 322 323 return total ? total : -EIO; 324 } 325 326 /** 327 * tpm2_flush_context() - execute a TPM2_FlushContext command 328 * @chip: TPM chip to use 329 * @handle: context handle 330 */ 331 void tpm2_flush_context(struct tpm_chip *chip, u32 handle) 332 { 333 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL); 334 if (!buf) { 335 dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n", 336 handle); 337 return; 338 } 339 340 tpm_buf_init(buf, TPM_BUFSIZE); 341 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT); 342 tpm_buf_append_u32(buf, handle); 343 344 tpm_transmit_cmd(chip, buf, 0, "flushing context"); 345 } 346 EXPORT_SYMBOL_GPL(tpm2_flush_context); 347 348 /** 349 * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property 350 * @chip: a &tpm_chip instance 351 * @property_id: property ID. 352 * @value: output variable. 353 * @desc: passed to tpm_transmit_cmd() 354 * 355 * Return: 356 * 0 on success, 357 * -errno or a TPM return code otherwise 358 */ 359 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value, 360 const char *desc) 361 { 362 struct tpm2_get_cap_out *out; 363 int rc; 364 365 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL); 366 if (!buf) 367 return -ENOMEM; 368 369 tpm_buf_init(buf, TPM_BUFSIZE); 370 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); 371 tpm_buf_append_u32(buf, TPM2_CAP_TPM_PROPERTIES); 372 tpm_buf_append_u32(buf, property_id); 373 tpm_buf_append_u32(buf, 1); 374 rc = tpm_transmit_cmd(chip, buf, 0, NULL); 375 if (!rc) { 376 out = (struct tpm2_get_cap_out *) 377 &buf->data[TPM_HEADER_SIZE]; 378 /* 379 * To prevent failing boot up of some systems, Infineon TPM2.0 380 * returns SUCCESS on TPM2_Startup in field upgrade mode. Also 381 * the TPM2_Getcapability command returns a zero length list 382 * in field upgrade mode. 383 */ 384 if (be32_to_cpu(out->property_cnt) > 0) 385 *value = be32_to_cpu(out->value); 386 else 387 rc = -ENODATA; 388 } 389 return rc; 390 } 391 EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt); 392 393 /** 394 * tpm2_shutdown() - send a TPM shutdown command 395 * 396 * Sends a TPM shutdown command. The shutdown command is used in call 397 * sites where the system is going down. If it fails, there is not much 398 * that can be done except print an error message. 399 * 400 * @chip: a &tpm_chip instance 401 * @shutdown_type: TPM_SU_CLEAR or TPM_SU_STATE. 402 */ 403 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type) 404 { 405 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL); 406 if (!buf) 407 return; 408 409 tpm_buf_init(buf, TPM_BUFSIZE); 410 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SHUTDOWN); 411 tpm_buf_append_u16(buf, shutdown_type); 412 tpm_transmit_cmd(chip, buf, 0, "stopping the TPM"); 413 } 414 415 /** 416 * tpm2_do_selftest() - ensure that all self tests have passed 417 * 418 * @chip: TPM chip to use 419 * 420 * Return: Same as with tpm_transmit_cmd. 421 * 422 * The TPM can either run all self tests synchronously and then return 423 * RC_SUCCESS once all tests were successful. Or it can choose to run the tests 424 * asynchronously and return RC_TESTING immediately while the self tests still 425 * execute in the background. This function handles both cases and waits until 426 * all tests have completed. 427 */ 428 static int tpm2_do_selftest(struct tpm_chip *chip) 429 { 430 int full; 431 int rc; 432 433 for (full = 0; full < 2; full++) { 434 struct tpm_buf *buf __free(kfree) = NULL; 435 436 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL); 437 if (!buf) 438 return -ENOMEM; 439 440 tpm_buf_init(buf, TPM_BUFSIZE); 441 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SELF_TEST); 442 tpm_buf_append_u8(buf, full); 443 rc = tpm_transmit_cmd(chip, buf, 0, 444 "attempting the self test"); 445 if (rc == TPM2_RC_TESTING) 446 rc = TPM2_RC_SUCCESS; 447 if (rc == TPM2_RC_INITIALIZE || rc == TPM2_RC_SUCCESS) 448 return rc; 449 } 450 451 return rc; 452 } 453 454 /** 455 * tpm2_probe() - probe for the TPM 2.0 protocol 456 * @chip: a &tpm_chip instance 457 * 458 * Send an idempotent TPM 2.0 command and see whether there is TPM2 chip in the 459 * other end based on the response tag. The flag TPM_CHIP_FLAG_TPM2 is set by 460 * this function if this is the case. 461 * 462 * Return: 463 * 0 on success, 464 * -errno otherwise 465 */ 466 int tpm2_probe(struct tpm_chip *chip) 467 { 468 struct tpm_header *out; 469 int rc; 470 471 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL); 472 if (!buf) 473 return -ENOMEM; 474 475 tpm_buf_init(buf, TPM_BUFSIZE); 476 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); 477 tpm_buf_append_u32(buf, TPM2_CAP_TPM_PROPERTIES); 478 tpm_buf_append_u32(buf, TPM_PT_TOTAL_COMMANDS); 479 tpm_buf_append_u32(buf, 1); 480 rc = tpm_transmit_cmd(chip, buf, 0, NULL); 481 /* We ignore TPM return codes on purpose. */ 482 if (rc >= 0) { 483 out = (struct tpm_header *)buf->data; 484 if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS) 485 chip->flags |= TPM_CHIP_FLAG_TPM2; 486 } 487 return 0; 488 } 489 EXPORT_SYMBOL_GPL(tpm2_probe); 490 491 static int tpm2_init_bank_info(struct tpm_chip *chip, u32 bank_index) 492 { 493 struct tpm_bank_info *bank = chip->allocated_banks + bank_index; 494 struct tpm_digest digest = { .alg_id = bank->alg_id }; 495 int i; 496 497 /* 498 * Avoid unnecessary PCR read operations to reduce overhead 499 * and obtain identifiers of the crypto subsystem. 500 */ 501 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) { 502 enum hash_algo crypto_algo = tpm2_hash_map[i].crypto_id; 503 504 if (bank->alg_id != tpm2_hash_map[i].tpm_id) 505 continue; 506 507 bank->digest_size = hash_digest_size[crypto_algo]; 508 bank->crypto_id = crypto_algo; 509 return 0; 510 } 511 512 bank->crypto_id = HASH_ALGO__LAST; 513 514 return tpm2_pcr_read(chip, 0, &digest, &bank->digest_size); 515 } 516 517 ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip) 518 { 519 struct tpm2_pcr_selection pcr_selection; 520 void *marker; 521 void *end; 522 void *pcr_select_offset; 523 u32 sizeof_pcr_selection; 524 u32 nr_possible_banks; 525 u32 nr_alloc_banks = 0; 526 u16 hash_alg; 527 u32 rsp_len; 528 int rc; 529 int i = 0; 530 531 struct tpm_buf *buf __free(kfree) = kzalloc(TPM_BUFSIZE, GFP_KERNEL); 532 if (!buf) 533 return -ENOMEM; 534 535 tpm_buf_init(buf, TPM_BUFSIZE); 536 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); 537 tpm_buf_append_u32(buf, TPM2_CAP_PCRS); 538 tpm_buf_append_u32(buf, 0); 539 tpm_buf_append_u32(buf, 1); 540 541 rc = tpm_transmit_cmd(chip, buf, 9, "get tpm pcr allocation"); 542 if (rc) 543 return rc; 544 545 nr_possible_banks = be32_to_cpup( 546 (__be32 *)&buf->data[TPM_HEADER_SIZE + 5]); 547 if (nr_possible_banks > TPM2_MAX_PCR_BANKS) { 548 pr_err("tpm: out of bank capacity: %u > %u\n", 549 nr_possible_banks, TPM2_MAX_PCR_BANKS); 550 return -ENOMEM; 551 } 552 553 marker = &buf->data[TPM_HEADER_SIZE + 9]; 554 555 rsp_len = be32_to_cpup((__be32 *)&buf->data[2]); 556 end = &buf->data[rsp_len]; 557 558 for (i = 0; i < nr_possible_banks; i++) { 559 pcr_select_offset = marker + 560 offsetof(struct tpm2_pcr_selection, size_of_select); 561 if (pcr_select_offset >= end) { 562 rc = -EFAULT; 563 break; 564 } 565 566 memcpy(&pcr_selection, marker, sizeof(pcr_selection)); 567 hash_alg = be16_to_cpu(pcr_selection.hash_alg); 568 569 pcr_select_offset = memchr_inv(pcr_selection.pcr_select, 0, 570 pcr_selection.size_of_select); 571 if (pcr_select_offset) { 572 chip->allocated_banks[nr_alloc_banks].alg_id = hash_alg; 573 574 rc = tpm2_init_bank_info(chip, nr_alloc_banks); 575 if (rc < 0) 576 break; 577 578 nr_alloc_banks++; 579 } 580 581 sizeof_pcr_selection = sizeof(pcr_selection.hash_alg) + 582 sizeof(pcr_selection.size_of_select) + 583 pcr_selection.size_of_select; 584 marker = marker + sizeof_pcr_selection; 585 } 586 587 chip->nr_allocated_banks = nr_alloc_banks; 588 589 return rc; 590 } 591 592 int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip) 593 { 594 u32 nr_commands; 595 __be32 *attrs; 596 u32 cc; 597 int i; 598 int rc; 599 600 struct tpm_buf *buf __free(kfree) = NULL; 601 602 rc = tpm2_get_tpm_pt(chip, TPM_PT_TOTAL_COMMANDS, &nr_commands, NULL); 603 if (rc) 604 goto out; 605 606 if (nr_commands > 0xFFFFF) { 607 rc = -EFAULT; 608 goto out; 609 } 610 611 chip->cc_attrs_tbl = devm_kcalloc(&chip->dev, 4, nr_commands, 612 GFP_KERNEL); 613 if (!chip->cc_attrs_tbl) { 614 rc = -ENOMEM; 615 goto out; 616 } 617 618 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL); 619 if (!buf) { 620 rc = -ENOMEM; 621 goto out; 622 } 623 624 tpm_buf_init(buf, TPM_BUFSIZE); 625 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); 626 tpm_buf_append_u32(buf, TPM2_CAP_COMMANDS); 627 tpm_buf_append_u32(buf, TPM2_CC_FIRST); 628 tpm_buf_append_u32(buf, nr_commands); 629 630 rc = tpm_transmit_cmd(chip, buf, 9 + 4 * nr_commands, NULL); 631 if (rc) 632 goto out; 633 634 if (nr_commands != 635 be32_to_cpup((__be32 *)&buf->data[TPM_HEADER_SIZE + 5])) { 636 rc = -EFAULT; 637 goto out; 638 } 639 640 chip->nr_commands = nr_commands; 641 642 attrs = (__be32 *)&buf->data[TPM_HEADER_SIZE + 9]; 643 for (i = 0; i < nr_commands; i++, attrs++) { 644 chip->cc_attrs_tbl[i] = be32_to_cpup(attrs); 645 cc = chip->cc_attrs_tbl[i] & 0xFFFF; 646 647 if (cc == TPM2_CC_CONTEXT_SAVE || cc == TPM2_CC_FLUSH_CONTEXT) { 648 chip->cc_attrs_tbl[i] &= 649 ~(GENMASK(2, 0) << TPM2_CC_ATTR_CHANDLES); 650 chip->cc_attrs_tbl[i] |= 1 << TPM2_CC_ATTR_CHANDLES; 651 } 652 } 653 654 out: 655 if (rc > 0) 656 rc = -ENODEV; 657 return rc; 658 } 659 EXPORT_SYMBOL_GPL(tpm2_get_cc_attrs_tbl); 660 661 /** 662 * tpm2_startup - turn on the TPM 663 * @chip: TPM chip to use 664 * 665 * Normally the firmware should start the TPM. This function is provided as a 666 * workaround if this does not happen. A legal case for this could be for 667 * example when a TPM emulator is used. 668 * 669 * Return: same as tpm_transmit_cmd() 670 */ 671 672 static int tpm2_startup(struct tpm_chip *chip) 673 { 674 struct tpm_buf *buf __free(kfree) = NULL; 675 676 dev_info(&chip->dev, "starting up the TPM manually\n"); 677 678 buf = kzalloc(TPM_BUFSIZE, GFP_KERNEL); 679 if (!buf) 680 return -ENOMEM; 681 682 tpm_buf_init(buf, TPM_BUFSIZE); 683 tpm_buf_reset(buf, TPM2_ST_NO_SESSIONS, TPM2_CC_STARTUP); 684 tpm_buf_append_u16(buf, TPM2_SU_CLEAR); 685 return tpm_transmit_cmd(chip, buf, 0, "attempting to start the TPM"); 686 } 687 688 /** 689 * tpm2_auto_startup - Perform the standard automatic TPM initialization 690 * sequence 691 * @chip: TPM chip to use 692 * 693 * Returns 0 on success, < 0 in case of fatal error. 694 */ 695 int tpm2_auto_startup(struct tpm_chip *chip) 696 { 697 int rc; 698 699 rc = tpm2_get_timeouts(chip); 700 if (rc) 701 goto out; 702 703 rc = tpm2_do_selftest(chip); 704 if (rc && rc != TPM2_RC_INITIALIZE) 705 goto out; 706 707 if (rc == TPM2_RC_INITIALIZE) { 708 rc = tpm2_startup(chip); 709 if (rc) 710 goto out; 711 712 rc = tpm2_do_selftest(chip); 713 if (rc) 714 goto out; 715 } 716 717 rc = tpm2_get_cc_attrs_tbl(chip); 718 if (rc == TPM2_RC_FAILURE || (rc < 0 && rc != -ENOMEM)) { 719 dev_info(&chip->dev, 720 "TPM in field failure mode, requires firmware upgrade\n"); 721 chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE; 722 rc = 0; 723 } 724 725 if (rc) 726 goto out; 727 728 rc = tpm2_sessions_init(chip); 729 730 out: 731 /* 732 * Infineon TPM in field upgrade mode will return no data for the number 733 * of supported commands. 734 */ 735 if (rc == TPM2_RC_UPGRADE || rc == -ENODATA) { 736 dev_info(&chip->dev, "TPM in field upgrade mode, requires firmware upgrade\n"); 737 chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE; 738 rc = 0; 739 } 740 741 if (rc > 0) 742 rc = -ENODEV; 743 return rc; 744 } 745 746 int tpm2_find_cc(struct tpm_chip *chip, u32 cc) 747 { 748 u32 cc_mask; 749 int i; 750 751 cc_mask = 1 << TPM2_CC_ATTR_VENDOR | GENMASK(15, 0); 752 for (i = 0; i < chip->nr_commands; i++) 753 if (cc == (chip->cc_attrs_tbl[i] & cc_mask)) 754 return i; 755 756 return -1; 757 } 758