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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 | /* * Copyright (C) 2004 IBM Corporation * Copyright (C) 2015 Intel Corporation * * Authors: * Leendert van Doorn <leendert@watson.ibm.com> * Dave Safford <safford@watson.ibm.com> * Reiner Sailer <sailer@watson.ibm.com> * Kylene Hall <kjhall@us.ibm.com> * * Maintained by: <tpmdd-devel@lists.sourceforge.net> * * Device driver for TCG/TCPA TPM (trusted platform module). * Specifications at www.trustedcomputinggroup.org * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. * */ #include <linux/module.h> #include <linux/delay.h> #include <linux/fs.h> #include <linux/mutex.h> #include <linux/sched.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/tpm.h> #include <linux/acpi.h> #include <linux/cdev.h> #include <linux/highmem.h> enum tpm_const { TPM_MINOR = 224, /* officially assigned */ TPM_BUFSIZE = 4096, TPM_NUM_DEVICES = 256, TPM_RETRY = 50, /* 5 seconds */ }; enum tpm_timeout { TPM_TIMEOUT = 5, /* msecs */ TPM_TIMEOUT_RETRY = 100 /* msecs */ }; /* TPM addresses */ enum tpm_addr { TPM_SUPERIO_ADDR = 0x2E, TPM_ADDR = 0x4E, }; /* Indexes the duration array */ enum tpm_duration { TPM_SHORT = 0, TPM_MEDIUM = 1, TPM_LONG = 2, TPM_UNDEFINED, }; #define TPM_WARN_RETRY 0x800 #define TPM_WARN_DOING_SELFTEST 0x802 #define TPM_ERR_DEACTIVATED 0x6 #define TPM_ERR_DISABLED 0x7 #define TPM_ERR_INVALID_POSTINIT 38 #define TPM_HEADER_SIZE 10 enum tpm2_const { TPM2_PLATFORM_PCR = 24, TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8), TPM2_TIMEOUT_A = 750, TPM2_TIMEOUT_B = 2000, TPM2_TIMEOUT_C = 200, TPM2_TIMEOUT_D = 30, TPM2_DURATION_SHORT = 20, TPM2_DURATION_MEDIUM = 750, TPM2_DURATION_LONG = 2000, }; enum tpm2_structures { TPM2_ST_NO_SESSIONS = 0x8001, TPM2_ST_SESSIONS = 0x8002, }; enum tpm2_return_codes { TPM2_RC_INITIALIZE = 0x0100, TPM2_RC_TESTING = 0x090A, TPM2_RC_DISABLED = 0x0120, }; enum tpm2_algorithms { TPM2_ALG_SHA1 = 0x0004, TPM2_ALG_KEYEDHASH = 0x0008, TPM2_ALG_SHA256 = 0x000B, TPM2_ALG_NULL = 0x0010 }; enum tpm2_command_codes { TPM2_CC_FIRST = 0x011F, TPM2_CC_SELF_TEST = 0x0143, TPM2_CC_STARTUP = 0x0144, TPM2_CC_SHUTDOWN = 0x0145, TPM2_CC_CREATE = 0x0153, TPM2_CC_LOAD = 0x0157, TPM2_CC_UNSEAL = 0x015E, TPM2_CC_FLUSH_CONTEXT = 0x0165, TPM2_CC_GET_CAPABILITY = 0x017A, TPM2_CC_GET_RANDOM = 0x017B, TPM2_CC_PCR_READ = 0x017E, TPM2_CC_PCR_EXTEND = 0x0182, TPM2_CC_LAST = 0x018F, }; enum tpm2_permanent_handles { TPM2_RS_PW = 0x40000009, }; enum tpm2_capabilities { TPM2_CAP_TPM_PROPERTIES = 6, }; enum tpm2_startup_types { TPM2_SU_CLEAR = 0x0000, TPM2_SU_STATE = 0x0001, }; enum tpm2_start_method { TPM2_START_ACPI = 2, TPM2_START_FIFO = 6, TPM2_START_CRB = 7, TPM2_START_CRB_WITH_ACPI = 8, }; struct tpm_chip; struct tpm_vendor_specific { void __iomem *iobase; /* ioremapped address */ unsigned long base; /* TPM base address */ int irq; int probed_irq; int region_size; int have_region; struct list_head list; int locality; unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */ bool timeout_adjusted; unsigned long duration[3]; /* jiffies */ bool duration_adjusted; void *priv; wait_queue_head_t read_queue; wait_queue_head_t int_queue; u16 manufacturer_id; }; #define TPM_VPRIV(c) ((c)->vendor.priv) #define TPM_VID_INTEL 0x8086 #define TPM_VID_WINBOND 0x1050 #define TPM_VID_STM 0x104A #define TPM_PPI_VERSION_LEN 3 enum tpm_chip_flags { TPM_CHIP_FLAG_REGISTERED = BIT(0), TPM_CHIP_FLAG_TPM2 = BIT(1), }; struct tpm_chip { struct device *pdev; /* Device stuff */ struct device dev; struct cdev cdev; const struct tpm_class_ops *ops; unsigned int flags; int dev_num; /* /dev/tpm# */ char devname[7]; unsigned long is_open; /* only one allowed */ int time_expired; struct mutex tpm_mutex; /* tpm is processing */ struct tpm_vendor_specific vendor; struct dentry **bios_dir; #ifdef CONFIG_ACPI const struct attribute_group *groups[2]; unsigned int groups_cnt; acpi_handle acpi_dev_handle; char ppi_version[TPM_PPI_VERSION_LEN + 1]; #endif /* CONFIG_ACPI */ struct list_head list; }; #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev) static inline void tpm_chip_put(struct tpm_chip *chip) { module_put(chip->pdev->driver->owner); } static inline int tpm_read_index(int base, int index) { outb(index, base); return inb(base+1) & 0xFF; } static inline void tpm_write_index(int base, int index, int value) { outb(index, base); outb(value & 0xFF, base+1); } struct tpm_input_header { __be16 tag; __be32 length; __be32 ordinal; } __packed; struct tpm_output_header { __be16 tag; __be32 length; __be32 return_code; } __packed; #define TPM_TAG_RQU_COMMAND cpu_to_be16(193) struct stclear_flags_t { __be16 tag; u8 deactivated; u8 disableForceClear; u8 physicalPresence; u8 physicalPresenceLock; u8 bGlobalLock; } __packed; struct tpm_version_t { u8 Major; u8 Minor; u8 revMajor; u8 revMinor; } __packed; struct tpm_version_1_2_t { __be16 tag; u8 Major; u8 Minor; u8 revMajor; u8 revMinor; } __packed; struct timeout_t { __be32 a; __be32 b; __be32 c; __be32 d; } __packed; struct duration_t { __be32 tpm_short; __be32 tpm_medium; __be32 tpm_long; } __packed; struct permanent_flags_t { __be16 tag; u8 disable; u8 ownership; u8 deactivated; u8 readPubek; u8 disableOwnerClear; u8 allowMaintenance; u8 physicalPresenceLifetimeLock; u8 physicalPresenceHWEnable; u8 physicalPresenceCMDEnable; u8 CEKPUsed; u8 TPMpost; u8 TPMpostLock; u8 FIPS; u8 operator; u8 enableRevokeEK; u8 nvLocked; u8 readSRKPub; u8 tpmEstablished; u8 maintenanceDone; u8 disableFullDALogicInfo; } __packed; typedef union { struct permanent_flags_t perm_flags; struct stclear_flags_t stclear_flags; bool owned; __be32 num_pcrs; struct tpm_version_t tpm_version; struct tpm_version_1_2_t tpm_version_1_2; __be32 manufacturer_id; struct timeout_t timeout; struct duration_t duration; } cap_t; enum tpm_capabilities { TPM_CAP_FLAG = cpu_to_be32(4), TPM_CAP_PROP = cpu_to_be32(5), CAP_VERSION_1_1 = cpu_to_be32(0x06), CAP_VERSION_1_2 = cpu_to_be32(0x1A) }; enum tpm_sub_capabilities { TPM_CAP_PROP_PCR = cpu_to_be32(0x101), TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103), TPM_CAP_FLAG_PERM = cpu_to_be32(0x108), TPM_CAP_FLAG_VOL = cpu_to_be32(0x109), TPM_CAP_PROP_OWNER = cpu_to_be32(0x111), TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115), TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120), }; struct tpm_getcap_params_in { __be32 cap; __be32 subcap_size; __be32 subcap; } __packed; struct tpm_getcap_params_out { __be32 cap_size; cap_t cap; } __packed; struct tpm_readpubek_params_out { u8 algorithm[4]; u8 encscheme[2]; u8 sigscheme[2]; __be32 paramsize; u8 parameters[12]; /*assuming RSA*/ __be32 keysize; u8 modulus[256]; u8 checksum[20]; } __packed; typedef union { struct tpm_input_header in; struct tpm_output_header out; } tpm_cmd_header; struct tpm_pcrread_out { u8 pcr_result[TPM_DIGEST_SIZE]; } __packed; struct tpm_pcrread_in { __be32 pcr_idx; } __packed; struct tpm_pcrextend_in { __be32 pcr_idx; u8 hash[TPM_DIGEST_SIZE]; } __packed; /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18 * bytes, but 128 is still a relatively large number of random bytes and * anything much bigger causes users of struct tpm_cmd_t to start getting * compiler warnings about stack frame size. */ #define TPM_MAX_RNG_DATA 128 struct tpm_getrandom_out { __be32 rng_data_len; u8 rng_data[TPM_MAX_RNG_DATA]; } __packed; struct tpm_getrandom_in { __be32 num_bytes; } __packed; struct tpm_startup_in { __be16 startup_type; } __packed; typedef union { struct tpm_getcap_params_out getcap_out; struct tpm_readpubek_params_out readpubek_out; u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)]; struct tpm_getcap_params_in getcap_in; struct tpm_pcrread_in pcrread_in; struct tpm_pcrread_out pcrread_out; struct tpm_pcrextend_in pcrextend_in; struct tpm_getrandom_in getrandom_in; struct tpm_getrandom_out getrandom_out; struct tpm_startup_in startup_in; } tpm_cmd_params; struct tpm_cmd_t { tpm_cmd_header header; tpm_cmd_params params; } __packed; /* A string buffer type for constructing TPM commands. This is based on the * ideas of string buffer code in security/keys/trusted.h but is heap based * in order to keep the stack usage minimal. */ enum tpm_buf_flags { TPM_BUF_OVERFLOW = BIT(0), }; struct tpm_buf { struct page *data_page; unsigned int flags; u8 *data; }; static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal) { struct tpm_input_header *head; buf->data_page = alloc_page(GFP_HIGHUSER); if (!buf->data_page) return -ENOMEM; buf->flags = 0; buf->data = kmap(buf->data_page); head = (struct tpm_input_header *) buf->data; head->tag = cpu_to_be16(tag); head->length = cpu_to_be32(sizeof(*head)); head->ordinal = cpu_to_be32(ordinal); return 0; } static inline void tpm_buf_destroy(struct tpm_buf *buf) { kunmap(buf->data_page); __free_page(buf->data_page); } static inline u32 tpm_buf_length(struct tpm_buf *buf) { struct tpm_input_header *head = (struct tpm_input_header *) buf->data; return be32_to_cpu(head->length); } static inline u16 tpm_buf_tag(struct tpm_buf *buf) { struct tpm_input_header *head = (struct tpm_input_header *) buf->data; return be16_to_cpu(head->tag); } static inline void tpm_buf_append(struct tpm_buf *buf, const unsigned char *new_data, unsigned int new_len) { struct tpm_input_header *head = (struct tpm_input_header *) buf->data; u32 len = tpm_buf_length(buf); /* Return silently if overflow has already happened. */ if (buf->flags & TPM_BUF_OVERFLOW) return; if ((len + new_len) > PAGE_SIZE) { WARN(1, "tpm_buf: overflow\n"); buf->flags |= TPM_BUF_OVERFLOW; return; } memcpy(&buf->data[len], new_data, new_len); head->length = cpu_to_be32(len + new_len); } static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value) { tpm_buf_append(buf, &value, 1); } static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value) { __be16 value2 = cpu_to_be16(value); tpm_buf_append(buf, (u8 *) &value2, 2); } static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value) { __be32 value2 = cpu_to_be32(value); tpm_buf_append(buf, (u8 *) &value2, 4); } extern struct class *tpm_class; extern dev_t tpm_devt; extern const struct file_operations tpm_fops; ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *); ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, size_t bufsiz); ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len, const char *desc); extern int tpm_get_timeouts(struct tpm_chip *); extern void tpm_gen_interrupt(struct tpm_chip *); extern int tpm_do_selftest(struct tpm_chip *); extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32); extern int tpm_pm_suspend(struct device *); extern int tpm_pm_resume(struct device *); extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long, wait_queue_head_t *, bool); struct tpm_chip *tpm_chip_find_get(int chip_num); extern struct tpm_chip *tpmm_chip_alloc(struct device *dev, const struct tpm_class_ops *ops); extern int tpm_chip_register(struct tpm_chip *chip); extern void tpm_chip_unregister(struct tpm_chip *chip); int tpm_sysfs_add_device(struct tpm_chip *chip); void tpm_sysfs_del_device(struct tpm_chip *chip); int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf); #ifdef CONFIG_ACPI extern void tpm_add_ppi(struct tpm_chip *chip); #else static inline void tpm_add_ppi(struct tpm_chip *chip) { } #endif int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf); int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash); int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max); int tpm2_seal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); int tpm2_unseal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value, const char *desc); extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type); extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type); extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32); extern int tpm2_do_selftest(struct tpm_chip *chip); extern int tpm2_gen_interrupt(struct tpm_chip *chip); extern int tpm2_probe(struct tpm_chip *chip); |