1 /* $OpenBSD: gpt.c,v 1.95 2024/12/24 21:34:23 krw Exp $ */ 2 /* 3 * Copyright (c) 2015 Markus Muller <mmu@grummel.net> 4 * Copyright (c) 2015 Kenneth R Westerback <krw@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/param.h> /* DEV_BSIZE */ 20 #include <sys/disklabel.h> 21 #include <sys/dkio.h> 22 #include <sys/ioctl.h> 23 24 #include <ctype.h> 25 #include <err.h> 26 #include <stdio.h> 27 #include <stdint.h> 28 #include <stdlib.h> 29 #include <string.h> 30 #include <uuid.h> 31 32 #include "part.h" 33 #include "disk.h" 34 #include "mbr.h" 35 #include "misc.h" 36 #include "gpt.h" 37 38 #ifdef DEBUG 39 #define DPRINTF(x...) printf(x) 40 #else 41 #define DPRINTF(x...) 42 #endif 43 44 struct mbr gmbr; 45 struct gpt_header gh; 46 struct gpt_partition gp[NGPTPARTITIONS]; 47 48 const struct gpt_partition * const *sort_gpt(void); 49 int lba_free(uint64_t *, uint64_t *); 50 int add_partition(const uint8_t *, const char *, uint64_t); 51 int find_partition(const uint8_t *); 52 int get_header(const uint64_t); 53 int get_partition_table(void); 54 int init_gh(void); 55 int init_gp(const int); 56 uint32_t crc32(const u_char *, const uint32_t); 57 int protective_mbr(const struct mbr *); 58 int gpt_chk_mbr(struct dos_partition *, uint64_t); 59 void string_to_name(const unsigned int, const char *); 60 const char *name_to_string(const unsigned int); 61 62 void 63 string_to_name(const unsigned int pn, const char *ch) 64 { 65 unsigned int i; 66 67 memset(gp[pn].gp_name, 0, sizeof(gp[pn].gp_name)); 68 69 for (i = 0; i < nitems(gp[pn].gp_name) && ch[i] != '\0'; i++) 70 gp[pn].gp_name[i] = htole16((unsigned int)ch[i]); 71 } 72 73 const char * 74 name_to_string(const unsigned int pn) 75 { 76 static char name[GPTPARTNAMESIZE + 1]; 77 unsigned int i; 78 79 for (i = 0; i < GPTPARTNAMESIZE && gp[pn].gp_name[i] != 0; i++) 80 name[i] = letoh16(gp[pn].gp_name[i]) & 0x7F; 81 name[i] = '\0'; 82 83 return name; 84 } 85 86 /* 87 * Return the index into dp[] of the EFI GPT (0xEE) partition, or -1 if no such 88 * partition exists. 89 * 90 * Taken from kern/subr_disk.c. 91 * 92 */ 93 int 94 gpt_chk_mbr(struct dos_partition *dp, u_int64_t dsize) 95 { 96 struct dos_partition *dp2; 97 int efi, eficnt, found, i; 98 uint32_t psize; 99 100 found = efi = eficnt = 0; 101 for (dp2 = dp, i = 0; i < NDOSPART; i++, dp2++) { 102 if (dp2->dp_typ == DOSPTYP_UNUSED) 103 continue; 104 found++; 105 if (dp2->dp_typ != DOSPTYP_EFI) 106 continue; 107 if (letoh32(dp2->dp_start) != GPTSECTOR) 108 continue; 109 psize = letoh32(dp2->dp_size); 110 if (psize <= (dsize - GPTSECTOR) || psize == UINT32_MAX) { 111 efi = i; 112 eficnt++; 113 } 114 } 115 if (found == 1 && eficnt == 1) 116 return efi; 117 118 return -1; 119 } 120 121 int 122 protective_mbr(const struct mbr *mbr) 123 { 124 struct dos_partition dp[NDOSPART], dos_partition; 125 unsigned int i; 126 127 if (mbr->mbr_lba_self != 0) 128 return -1; 129 130 for (i = 0; i < nitems(dp); i++) { 131 memset(&dos_partition, 0, sizeof(dos_partition)); 132 if (i < nitems(mbr->mbr_prt)) 133 PRT_prt_to_dp(&mbr->mbr_prt[i], mbr->mbr_lba_self, 134 mbr->mbr_lba_firstembr, &dos_partition); 135 memcpy(&dp[i], &dos_partition, sizeof(dp[i])); 136 } 137 138 return gpt_chk_mbr(dp, DL_GETDSIZE(&dl)); 139 } 140 141 int 142 get_header(const uint64_t sector) 143 { 144 struct gpt_header legh; 145 uint64_t gpbytes, gpsectors, lba_end; 146 147 if (DISK_readbytes(&legh, sector, sizeof(legh))) 148 return -1; 149 150 gh.gh_sig = letoh64(legh.gh_sig); 151 if (gh.gh_sig != GPTSIGNATURE) { 152 DPRINTF("gpt signature: expected 0x%llx, got 0x%llx\n", 153 GPTSIGNATURE, gh.gh_sig); 154 return -1; 155 } 156 157 gh.gh_rev = letoh32(legh.gh_rev); 158 if (gh.gh_rev != GPTREVISION) { 159 DPRINTF("gpt revision: expected 0x%x, got 0x%x\n", 160 GPTREVISION, gh.gh_rev); 161 return -1; 162 } 163 164 gh.gh_lba_self = letoh64(legh.gh_lba_self); 165 if (gh.gh_lba_self != sector) { 166 DPRINTF("gpt self lba: expected %llu, got %llu\n", 167 sector, gh.gh_lba_self); 168 return -1; 169 } 170 171 gh.gh_size = letoh32(legh.gh_size); 172 if (gh.gh_size != GPTMINHDRSIZE) { 173 DPRINTF("gpt header size: expected %u, got %u\n", 174 GPTMINHDRSIZE, gh.gh_size); 175 return -1; 176 } 177 178 gh.gh_part_size = letoh32(legh.gh_part_size); 179 if (gh.gh_part_size != GPTMINPARTSIZE) { 180 DPRINTF("gpt partition size: expected %u, got %u\n", 181 GPTMINPARTSIZE, gh.gh_part_size); 182 return -1; 183 } 184 185 if ((dl.d_secsize % gh.gh_part_size) != 0) { 186 DPRINTF("gpt sector size %% partition size (%u %% %u) != 0\n", 187 dl.d_secsize, gh.gh_part_size); 188 return -1; 189 } 190 191 gh.gh_part_num = letoh32(legh.gh_part_num); 192 if (gh.gh_part_num > NGPTPARTITIONS) { 193 DPRINTF("gpt partition count: expected <= %u, got %u\n", 194 NGPTPARTITIONS, gh.gh_part_num); 195 return -1; 196 } 197 198 gh.gh_csum = letoh32(legh.gh_csum); 199 legh.gh_csum = 0; 200 legh.gh_csum = crc32((unsigned char *)&legh, gh.gh_size); 201 if (legh.gh_csum != gh.gh_csum) { 202 DPRINTF("gpt header checksum: expected 0x%x, got 0x%x\n", 203 legh.gh_csum, gh.gh_csum); 204 /* Accept wrong-endian checksum. */ 205 if (swap32(legh.gh_csum) != gh.gh_csum) 206 return -1; 207 } 208 209 gpbytes = gh.gh_part_num * gh.gh_part_size; 210 gpsectors = (gpbytes + dl.d_secsize - 1) / dl.d_secsize; 211 lba_end = DL_GETDSIZE(&dl) - gpsectors - 2; 212 213 gh.gh_lba_end = letoh64(legh.gh_lba_end); 214 if (gh.gh_lba_end > lba_end) { 215 DPRINTF("gpt last usable LBA: reduced from %llu to %llu\n", 216 gh.gh_lba_end, lba_end); 217 gh.gh_lba_end = lba_end; 218 } 219 220 gh.gh_lba_start = letoh64(legh.gh_lba_start); 221 if (gh.gh_lba_start >= gh.gh_lba_end) { 222 DPRINTF("gpt first usable LBA: expected < %llu, got %llu\n", 223 gh.gh_lba_end, gh.gh_lba_start); 224 return -1; 225 } 226 227 gh.gh_part_lba = letoh64(legh.gh_part_lba); 228 if (gh.gh_lba_self == GPTSECTOR) { 229 if (gh.gh_part_lba <= GPTSECTOR) { 230 DPRINTF("gpt partition entries start: expected > %u, " 231 "got %llu\n", GPTSECTOR, gh.gh_part_lba); 232 return -1; 233 } 234 if (gh.gh_part_lba + gpsectors > gh.gh_lba_start) { 235 DPRINTF("gpt partition entries end: expected < %llu, " 236 "got %llu\n", gh.gh_lba_start, 237 gh.gh_part_lba + gpsectors); 238 return -1; 239 } 240 } else { 241 if (gh.gh_part_lba <= gh.gh_lba_end) { 242 DPRINTF("gpt partition entries start: expected > %llu, " 243 "got %llu\n", gh.gh_lba_end, gh.gh_part_lba); 244 return -1; 245 } 246 if (gh.gh_part_lba + gpsectors > gh.gh_lba_self) { 247 DPRINTF("gpt partition entries end: expected < %llu, " 248 "got %llu\n", gh.gh_lba_self, 249 gh.gh_part_lba + gpsectors); 250 return -1; 251 } 252 } 253 254 gh.gh_lba_alt = letoh32(legh.gh_lba_alt); 255 gh.gh_part_csum = letoh32(legh.gh_part_csum); 256 gh.gh_rsvd = letoh32(legh.gh_rsvd); /* Should always be 0. */ 257 uuid_dec_le(&legh.gh_guid, &gh.gh_guid); 258 259 return 0; 260 } 261 262 int 263 get_partition_table(void) 264 { 265 struct gpt_partition *legp; 266 uint64_t gpbytes; 267 unsigned int pn; 268 int rslt = -1; 269 uint32_t gh_part_csum; 270 271 DPRINTF("gpt partition table being read from LBA %llu\n", 272 gh.gh_part_lba); 273 274 gpbytes = gh.gh_part_num * gh.gh_part_size; 275 276 legp = calloc(1, gpbytes); 277 if (legp == NULL) 278 err(1, "legp"); 279 280 if (DISK_readbytes(legp, gh.gh_part_lba, gpbytes)) 281 goto done; 282 gh_part_csum = crc32((unsigned char *)legp, gpbytes); 283 284 if (gh_part_csum != gh.gh_part_csum) { 285 DPRINTF("gpt partition table checksum: expected 0x%x, " 286 "got 0x%x\n", gh.gh_part_csum, gh_part_csum); 287 /* Accept wrong-endian checksum. */ 288 if (swap32(gh_part_csum) != gh.gh_part_csum) 289 goto done; 290 } 291 292 memset(&gp, 0, sizeof(gp)); 293 for (pn = 0; pn < gh.gh_part_num; pn++) { 294 uuid_dec_le(&legp[pn].gp_type, &gp[pn].gp_type); 295 uuid_dec_le(&legp[pn].gp_guid, &gp[pn].gp_guid); 296 gp[pn].gp_lba_start = letoh64(legp[pn].gp_lba_start); 297 gp[pn].gp_lba_end = letoh64(legp[pn].gp_lba_end); 298 gp[pn].gp_attrs = letoh64(legp[pn].gp_attrs); 299 memcpy(gp[pn].gp_name, legp[pn].gp_name, 300 sizeof(gp[pn].gp_name)); 301 } 302 rslt = 0; 303 304 done: 305 free(legp); 306 return rslt; 307 } 308 309 int 310 GPT_read(const int which) 311 { 312 int error; 313 314 error = MBR_read(0, 0, &gmbr); 315 if (error) 316 goto done; 317 error = protective_mbr(&gmbr); 318 if (error == -1) 319 goto done; 320 321 switch (which) { 322 case PRIMARYGPT: 323 error = get_header(GPTSECTOR); 324 break; 325 case SECONDARYGPT: 326 error = get_header(DL_GETDSIZE(&dl) - 1); 327 break; 328 case ANYGPT: 329 error = get_header(GPTSECTOR); 330 if (error != 0 || get_partition_table() != 0) 331 error = get_header(DL_GETDSIZE(&dl) - 1); 332 break; 333 default: 334 return -1; 335 } 336 337 if (error == 0) 338 error = get_partition_table(); 339 340 done: 341 if (error != 0) { 342 /* No valid GPT found. Zap any artifacts. */ 343 memset(&gmbr, 0, sizeof(gmbr)); 344 memset(&gh, 0, sizeof(gh)); 345 memset(&gp, 0, sizeof(gp)); 346 } 347 348 return error; 349 } 350 351 void 352 GPT_print(const char *units, const int verbosity) 353 { 354 const struct unit_type *ut; 355 const int secsize = dl.d_secsize; 356 char *guidstr = NULL; 357 double size; 358 unsigned int pn; 359 uint32_t status; 360 361 #ifdef DEBUG 362 char *p; 363 uint64_t sig; 364 unsigned int i; 365 366 sig = htole64(gh.gh_sig); 367 p = (char *)&sig; 368 369 printf("gh_sig : "); 370 for (i = 0; i < sizeof(sig); i++) 371 printf("%c", isprint((unsigned char)p[i]) ? p[i] : '?'); 372 printf(" ("); 373 for (i = 0; i < sizeof(sig); i++) { 374 printf("%02x", p[i]); 375 if ((i + 1) < sizeof(sig)) 376 printf(":"); 377 } 378 printf(")\n"); 379 printf("gh_rev : %u\n", gh.gh_rev); 380 printf("gh_size : %u (%zd)\n", gh.gh_size, sizeof(gh)); 381 printf("gh_csum : 0x%x\n", gh.gh_csum); 382 printf("gh_rsvd : %u\n", gh.gh_rsvd); 383 printf("gh_lba_self : %llu\n", gh.gh_lba_self); 384 printf("gh_lba_alt : %llu\n", gh.gh_lba_alt); 385 printf("gh_lba_start : %llu\n", gh.gh_lba_start); 386 printf("gh_lba_end : %llu\n", gh.gh_lba_end); 387 p = NULL; 388 uuid_to_string(&gh.gh_guid, &p, &status); 389 printf("gh_gh_guid : %s\n", (status == uuid_s_ok) ? p : "<invalid>"); 390 free(p); 391 printf("gh_gh_part_lba : %llu\n", gh.gh_part_lba); 392 printf("gh_gh_part_num : %u (%zu)\n", gh.gh_part_num, nitems(gp)); 393 printf("gh_gh_part_size: %u (%zu)\n", gh.gh_part_size, sizeof(gp[0])); 394 printf("gh_gh_part_csum: 0x%x\n", gh.gh_part_csum); 395 printf("\n"); 396 #endif /* DEBUG */ 397 398 size = units_size(units, DL_GETDSIZE(&dl), &ut); 399 printf("Disk: %s Usable LBA: %llu to %llu [%.0f ", 400 disk.dk_name, gh.gh_lba_start, gh.gh_lba_end, size); 401 if (ut->ut_conversion == 0 && secsize != DEV_BSIZE) 402 printf("%d-byte ", secsize); 403 printf("%s]\n", ut->ut_lname); 404 405 if (verbosity == VERBOSE) { 406 printf("GUID: "); 407 uuid_to_string(&gh.gh_guid, &guidstr, &status); 408 if (status == uuid_s_ok) 409 printf("%s\n", guidstr); 410 else 411 printf("<invalid header GUID>\n"); 412 free(guidstr); 413 } 414 415 GPT_print_parthdr(verbosity); 416 for (pn = 0; pn < gh.gh_part_num; pn++) { 417 if (uuid_is_nil(&gp[pn].gp_type, NULL)) 418 continue; 419 GPT_print_part(pn, units, verbosity); 420 } 421 } 422 423 void 424 GPT_print_parthdr(const int verbosity) 425 { 426 printf(" #: type " 427 " [ start: size ]\n"); 428 if (verbosity == VERBOSE) 429 printf(" guid name\n"); 430 printf("--------------------------------------------------------" 431 "----------------\n"); 432 } 433 434 void 435 GPT_print_part(const unsigned int pn, const char *units, const int verbosity) 436 { 437 const struct unit_type *ut; 438 char *guidstr = NULL; 439 double size; 440 uint64_t attrs, end, start; 441 uint32_t status; 442 443 start = gp[pn].gp_lba_start; 444 end = gp[pn].gp_lba_end; 445 size = units_size(units, (start > end) ? 0 : end - start + 1, &ut); 446 447 printf(" %3u: %-36s [%12lld: %12.0f%s]\n", pn, 448 PRT_uuid_to_desc(&gp[pn].gp_type), start, size, ut->ut_abbr); 449 450 if (verbosity == VERBOSE) { 451 uuid_to_string(&gp[pn].gp_guid, &guidstr, &status); 452 if (status != uuid_s_ok) 453 printf(" <invalid partition guid> "); 454 else 455 printf(" %-36s ", guidstr); 456 printf("%s\n", name_to_string(pn)); 457 free(guidstr); 458 attrs = gp[pn].gp_attrs; 459 if (attrs) { 460 printf(" Attributes: (0x%016llx) ", attrs); 461 if (attrs & GPTPARTATTR_REQUIRED) 462 printf("Required " ); 463 if (attrs & GPTPARTATTR_IGNORE) 464 printf("Ignore "); 465 if (attrs & GPTPARTATTR_BOOTABLE) 466 printf("Bootable "); 467 if (attrs & GPTPARTATTR_MS_READONLY) 468 printf("MSReadOnly " ); 469 if (attrs & GPTPARTATTR_MS_SHADOW) 470 printf("MSShadow "); 471 if (attrs & GPTPARTATTR_MS_HIDDEN) 472 printf("MSHidden "); 473 if (attrs & GPTPARTATTR_MS_NOAUTOMOUNT) 474 printf("MSNoAutoMount "); 475 printf("\n"); 476 } 477 } 478 479 if (uuid_is_nil(&gp[pn].gp_type, NULL) == 0) { 480 if (start > end) 481 printf("partition %u first LBA is > last LBA\n", pn); 482 if (start < gh.gh_lba_start || end > gh.gh_lba_end) 483 printf("partition %u extends beyond usable LBA range " 484 "of %s\n", pn, disk.dk_name); 485 } 486 } 487 488 int 489 find_partition(const uint8_t *beuuid) 490 { 491 struct uuid uuid; 492 unsigned int pn; 493 494 uuid_dec_be(beuuid, &uuid); 495 496 for (pn = 0; pn < gh.gh_part_num; pn++) { 497 if (uuid_compare(&gp[pn].gp_type, &uuid, NULL) == 0) 498 return pn; 499 } 500 return -1; 501 } 502 503 int 504 add_partition(const uint8_t *beuuid, const char *name, uint64_t sectors) 505 { 506 struct uuid uuid; 507 int rslt; 508 uint64_t end, freesectors, start; 509 uint32_t status, pn; 510 511 uuid_dec_be(beuuid, &uuid); 512 513 for (pn = 0; pn < gh.gh_part_num; pn++) { 514 if (uuid_is_nil(&gp[pn].gp_type, NULL)) 515 break; 516 } 517 if (pn == gh.gh_part_num) 518 goto done; 519 520 rslt = lba_free(&start, &end); 521 if (rslt == -1) 522 goto done; 523 524 if (start % BLOCKALIGNMENT) 525 start += (BLOCKALIGNMENT - start % BLOCKALIGNMENT); 526 if (start >= end) 527 goto done; 528 529 freesectors = end - start + 1; 530 531 if (sectors == 0) 532 sectors = freesectors; 533 534 if (freesectors < sectors) 535 goto done; 536 else if (freesectors > sectors) 537 end = start + sectors - 1; 538 539 gp[pn].gp_type = uuid; 540 gp[pn].gp_lba_start = start; 541 gp[pn].gp_lba_end = end; 542 string_to_name(pn, name); 543 544 uuid_create(&gp[pn].gp_guid, &status); 545 if (status == uuid_s_ok) 546 return 0; 547 548 done: 549 if (pn != gh.gh_part_num) 550 memset(&gp[pn], 0, sizeof(gp[pn])); 551 printf("unable to add %s\n", name); 552 return -1; 553 } 554 555 int 556 init_gh(void) 557 { 558 struct gpt_header oldgh; 559 const int secsize = dl.d_secsize; 560 int needed; 561 uint32_t status; 562 563 memcpy(&oldgh, &gh, sizeof(oldgh)); 564 memset(&gh, 0, sizeof(gh)); 565 memset(&gmbr, 0, sizeof(gmbr)); 566 567 /* XXX Do we need the boot code? UEFI spec & Apple says no. */ 568 memcpy(gmbr.mbr_code, default_dmbr.dmbr_boot, sizeof(gmbr.mbr_code)); 569 gmbr.mbr_prt[0].prt_id = DOSPTYP_EFI; 570 gmbr.mbr_prt[0].prt_bs = 1; 571 gmbr.mbr_prt[0].prt_ns = UINT32_MAX; 572 gmbr.mbr_signature = DOSMBR_SIGNATURE; 573 574 needed = sizeof(gp) / secsize + 2; 575 576 if (needed % BLOCKALIGNMENT) 577 needed += (needed - (needed % BLOCKALIGNMENT)); 578 579 gh.gh_sig = GPTSIGNATURE; 580 gh.gh_rev = GPTREVISION; 581 gh.gh_size = GPTMINHDRSIZE; 582 gh.gh_csum = 0; 583 gh.gh_rsvd = 0; 584 gh.gh_lba_self = 1; 585 gh.gh_lba_alt = DL_GETDSIZE(&dl) - 1; 586 gh.gh_lba_start = needed; 587 gh.gh_lba_end = DL_GETDSIZE(&dl) - needed; 588 uuid_create(&gh.gh_guid, &status); 589 if (status != uuid_s_ok) { 590 memcpy(&gh, &oldgh, sizeof(gh)); 591 return -1; 592 } 593 gh.gh_part_lba = 2; 594 gh.gh_part_num = NGPTPARTITIONS; 595 gh.gh_part_size = GPTMINPARTSIZE; 596 gh.gh_part_csum = 0; 597 598 return 0; 599 } 600 601 int 602 init_gp(const int how) 603 { 604 struct gpt_partition oldgp[NGPTPARTITIONS]; 605 const uint8_t gpt_uuid_efi_system[] = GPT_UUID_EFI_SYSTEM; 606 const uint8_t gpt_uuid_openbsd[] = GPT_UUID_OPENBSD; 607 uint64_t prt_ns; 608 int pn, rslt; 609 610 memcpy(&oldgp, &gp, sizeof(oldgp)); 611 if (how == GHANDGP) 612 memset(&gp, 0, sizeof(gp)); 613 else { 614 for (pn = 0; pn < gh.gh_part_num; pn++) { 615 if (PRT_protected_uuid(&gp[pn].gp_type) || 616 (gp[pn].gp_attrs & GPTPARTATTR_REQUIRED)) 617 continue; 618 memset(&gp[pn], 0, sizeof(gp[pn])); 619 } 620 } 621 622 rslt = 0; 623 if (disk.dk_bootprt.prt_ns > 0) { 624 pn = find_partition(gpt_uuid_efi_system); 625 if (pn == -1) { 626 rslt = add_partition(gpt_uuid_efi_system, 627 "EFI System Area", disk.dk_bootprt.prt_ns); 628 } else { 629 prt_ns = gp[pn].gp_lba_end - gp[pn].gp_lba_start + 1; 630 if (prt_ns < disk.dk_bootprt.prt_ns) { 631 printf("EFI System Area < %llu sectors\n", 632 disk.dk_bootprt.prt_ns); 633 rslt = -1; 634 } 635 } 636 } 637 if (rslt == 0) 638 rslt = add_partition(gpt_uuid_openbsd, "OpenBSD Area", 0); 639 640 if (rslt != 0) 641 memcpy(&gp, &oldgp, sizeof(gp)); 642 643 return rslt; 644 } 645 646 int 647 GPT_init(const int how) 648 { 649 int rslt = 0; 650 651 if (how == GHANDGP) 652 rslt = init_gh(); 653 if (rslt == 0) 654 rslt = init_gp(how); 655 656 return rslt; 657 } 658 659 void 660 GPT_zap_headers(void) 661 { 662 struct gpt_header legh; 663 664 if (DISK_readbytes(&legh, GPTSECTOR, sizeof(legh))) 665 return; 666 667 if (letoh64(legh.gh_sig) == GPTSIGNATURE) { 668 memset(&legh, 0, sizeof(legh)); 669 if (DISK_writebytes(&legh, GPTSECTOR, sizeof(legh))) 670 DPRINTF("Unable to zap GPT header @ sector %d", 671 GPTSECTOR); 672 } 673 674 if (DISK_readbytes(&legh, DL_GETDSIZE(&dl) - 1, sizeof(legh))) 675 return; 676 677 if (letoh64(legh.gh_sig) == GPTSIGNATURE) { 678 memset(&legh, 0, GPTMINHDRSIZE); 679 if (DISK_writebytes(&legh, DL_GETDSIZE(&dl) - 1, sizeof(legh))) 680 DPRINTF("Unable to zap GPT header @ sector %llu", 681 DL_GETDSIZE(&dl) - 1); 682 } 683 } 684 685 int 686 GPT_write(void) 687 { 688 struct gpt_header legh; 689 struct gpt_partition *legp; 690 uint64_t altgh, altgp; 691 uint64_t gpbytes, gpsectors; 692 unsigned int pn; 693 int rslt = -1; 694 695 if (MBR_write(&gmbr)) 696 return -1; 697 698 gpbytes = gh.gh_part_num * gh.gh_part_size; 699 gpsectors = (gpbytes + dl.d_secsize - 1) / dl.d_secsize; 700 701 altgh = DL_GETDSIZE(&dl) - 1; 702 altgp = altgh - gpsectors; 703 704 legh.gh_sig = htole64(GPTSIGNATURE); 705 legh.gh_rev = htole32(GPTREVISION); 706 legh.gh_size = htole32(GPTMINHDRSIZE); 707 legh.gh_rsvd = 0; 708 legh.gh_lba_self = htole64(GPTSECTOR); 709 legh.gh_lba_alt = htole64(altgh); 710 legh.gh_lba_start = htole64(gh.gh_lba_start); 711 legh.gh_lba_end = htole64(gh.gh_lba_end); 712 uuid_enc_le(&legh.gh_guid, &gh.gh_guid); 713 legh.gh_part_lba = htole64(GPTSECTOR + 1); 714 legh.gh_part_num = htole32(gh.gh_part_num); 715 legh.gh_part_size = htole32(GPTMINPARTSIZE); 716 717 legp = calloc(1, gpbytes); 718 if (legp == NULL) 719 err(1, "legp"); 720 721 for (pn = 0; pn < gh.gh_part_num; pn++) { 722 uuid_enc_le(&legp[pn].gp_type, &gp[pn].gp_type); 723 uuid_enc_le(&legp[pn].gp_guid, &gp[pn].gp_guid); 724 legp[pn].gp_lba_start = htole64(gp[pn].gp_lba_start); 725 legp[pn].gp_lba_end = htole64(gp[pn].gp_lba_end); 726 legp[pn].gp_attrs = htole64(gp[pn].gp_attrs); 727 memcpy(legp[pn].gp_name, gp[pn].gp_name, 728 sizeof(legp[pn].gp_name)); 729 } 730 legh.gh_part_csum = htole32(crc32((unsigned char *)legp, gpbytes)); 731 legh.gh_csum = 0; 732 legh.gh_csum = htole32(crc32((unsigned char *)&legh, gh.gh_size)); 733 734 if (DISK_writebytes(&legh, GPTSECTOR, gh.gh_size) || 735 DISK_writebytes(legp, GPTSECTOR + 1, gpbytes)) 736 goto done; 737 738 legh.gh_lba_self = htole64(altgh); 739 legh.gh_lba_alt = htole64(GPTSECTOR); 740 legh.gh_part_lba = htole64(altgp); 741 legh.gh_csum = 0; 742 legh.gh_csum = htole32(crc32((unsigned char *)&legh, gh.gh_size)); 743 744 if (DISK_writebytes(&legh, altgh, gh.gh_size) || 745 DISK_writebytes(&gp, altgp, gpbytes)) 746 goto done; 747 748 /* Refresh in-kernel disklabel from the updated disk information. */ 749 if (ioctl(disk.dk_fd, DIOCRLDINFO, 0) == -1) 750 warn("DIOCRLDINFO"); 751 rslt = 0; 752 753 done: 754 free(legp); 755 return rslt; 756 } 757 758 int 759 gp_lba_start_cmp(const void *e1, const void *e2) 760 { 761 struct gpt_partition *p1 = *(struct gpt_partition **)e1; 762 struct gpt_partition *p2 = *(struct gpt_partition **)e2; 763 uint64_t o1; 764 uint64_t o2; 765 766 o1 = p1->gp_lba_start; 767 o2 = p2->gp_lba_start; 768 769 if (o1 < o2) 770 return -1; 771 else if (o1 > o2) 772 return 1; 773 else 774 return 0; 775 } 776 777 const struct gpt_partition * const * 778 sort_gpt(void) 779 { 780 static const struct gpt_partition *sgp[NGPTPARTITIONS+2]; 781 unsigned int i, pn; 782 783 memset(sgp, 0, sizeof(sgp)); 784 785 i = 0; 786 for (pn = 0; pn < gh.gh_part_num; pn++) { 787 if (gp[pn].gp_lba_start >= gh.gh_lba_start) 788 sgp[i++] = &gp[pn]; 789 } 790 791 if (i > 1) { 792 if (mergesort(sgp, i, sizeof(sgp[0]), gp_lba_start_cmp) == -1) { 793 printf("unable to sort gpt by lba start\n"); 794 return NULL; 795 } 796 } 797 798 return sgp; 799 } 800 801 int 802 lba_free(uint64_t *start, uint64_t *end) 803 { 804 const struct gpt_partition * const *sgp; 805 uint64_t bs, bigbs, nextbs, ns; 806 unsigned int i; 807 808 sgp = sort_gpt(); 809 if (sgp == NULL) 810 return -1; 811 812 bs = gh.gh_lba_start; 813 ns = gh.gh_lba_end - bs + 1; 814 815 if (sgp[0] != NULL) { 816 bigbs = bs; 817 ns = 0; 818 for (i = 0; sgp[i] != NULL; i++) { 819 nextbs = sgp[i]->gp_lba_start; 820 if (bs < nextbs && ns < nextbs - bs) { 821 ns = nextbs - bs; 822 bigbs = bs; 823 } 824 bs = sgp[i]->gp_lba_end + 1; 825 } 826 nextbs = gh.gh_lba_end + 1; 827 if (bs < nextbs && ns < nextbs - bs) { 828 ns = nextbs - bs; 829 bigbs = bs; 830 } 831 bs = bigbs; 832 } 833 834 if (ns == 0) 835 return -1; 836 837 if (start != NULL) 838 *start = bs; 839 if (end != NULL) 840 *end = bs + ns - 1; 841 842 return 0; 843 } 844 845 int 846 GPT_get_lba_start(const unsigned int pn) 847 { 848 uint64_t bs; 849 unsigned int i; 850 int rslt; 851 852 bs = gh.gh_lba_start; 853 854 if (gp[pn].gp_lba_start >= bs) { 855 bs = gp[pn].gp_lba_start; 856 } else { 857 rslt = lba_free(&bs, NULL); 858 if (rslt == -1) { 859 printf("no space for partition %u\n", pn); 860 return -1; 861 } 862 } 863 864 bs = getuint64("Partition offset", bs, gh.gh_lba_start, gh.gh_lba_end); 865 for (i = 0; i < gh.gh_part_num; i++) { 866 if (i == pn) 867 continue; 868 if (bs >= gp[i].gp_lba_start && bs <= gp[i].gp_lba_end) { 869 printf("partition %u can't start inside partition %u\n", 870 pn, i); 871 return -1; 872 } 873 } 874 875 gp[pn].gp_lba_start = bs; 876 877 return 0; 878 } 879 880 int 881 GPT_get_lba_end(const unsigned int pn) 882 { 883 const struct gpt_partition * const *sgp; 884 uint64_t bs, nextbs, ns; 885 unsigned int i; 886 887 sgp = sort_gpt(); 888 if (sgp == NULL) 889 return -1; 890 891 bs = gp[pn].gp_lba_start; 892 ns = gh.gh_lba_end - bs + 1; 893 for (i = 0; sgp[i] != NULL; i++) { 894 nextbs = sgp[i]->gp_lba_start; 895 if (nextbs > bs) { 896 ns = nextbs - bs; 897 break; 898 } 899 } 900 ns = getuint64("Partition size", ns, 1, ns); 901 902 gp[pn].gp_lba_end = bs + ns - 1; 903 904 return 0; 905 } 906 907 int 908 GPT_get_name(const unsigned int pn) 909 { 910 char name[GPTPARTNAMESIZE + 1]; 911 912 printf("Partition name: [%s] ", name_to_string(pn)); 913 string_from_line(name, sizeof(name), UNTRIMMED); 914 915 switch (strlen(name)) { 916 case 0: 917 break; 918 case GPTPARTNAMESIZE: 919 printf("partition name must be < %d characters\n", 920 GPTPARTNAMESIZE); 921 return -1; 922 default: 923 string_to_name(pn, name); 924 break; 925 } 926 927 return 0; 928 } 929 930 /* 931 * Adapted from Hacker's Delight crc32b(). 932 * 933 * To quote http://www.hackersdelight.org/permissions.htm : 934 * 935 * "You are free to use, copy, and distribute any of the code on 936 * this web site, whether modified by you or not. You need not give 937 * attribution. This includes the algorithms (some of which appear 938 * in Hacker's Delight), the Hacker's Assistant, and any code submitted 939 * by readers. Submitters implicitly agree to this." 940 */ 941 uint32_t 942 crc32(const u_char *buf, const uint32_t size) 943 { 944 int j; 945 uint32_t i, byte, crc, mask; 946 947 crc = 0xFFFFFFFF; 948 949 for (i = 0; i < size; i++) { 950 byte = buf[i]; /* Get next byte. */ 951 crc = crc ^ byte; 952 for (j = 7; j >= 0; j--) { /* Do eight times. */ 953 mask = -(crc & 1); 954 crc = (crc >> 1) ^ (0xEDB88320 & mask); 955 } 956 } 957 958 return ~crc; 959 } 960