1 /************************************************************ 2 * EFI GUID Partition Table handling 3 * 4 * http://www.uefi.org/specs/ 5 * http://www.intel.com/technology/efi/ 6 * 7 * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com> 8 * Copyright 2000,2001,2002,2004 Dell Inc. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 * 25 * TODO: 26 * 27 * Changelog: 28 * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com> 29 * - test for valid PMBR and valid PGPT before ever reading 30 * AGPT, allow override with 'gpt' kernel command line option. 31 * - check for first/last_usable_lba outside of size of disk 32 * 33 * Tue Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com> 34 * - Ported to 2.5.7-pre1 and 2.5.7-dj2 35 * - Applied patch to avoid fault in alternate header handling 36 * - cleaned up find_valid_gpt 37 * - On-disk structure and copy in memory is *always* LE now - 38 * swab fields as needed 39 * - remove print_gpt_header() 40 * - only use first max_p partition entries, to keep the kernel minor number 41 * and partition numbers tied. 42 * 43 * Mon Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com> 44 * - Removed __PRIPTR_PREFIX - not being used 45 * 46 * Mon Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com> 47 * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied 48 * 49 * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com> 50 * - Added compare_gpts(). 51 * - moved le_efi_guid_to_cpus() back into this file. GPT is the only 52 * thing that keeps EFI GUIDs on disk. 53 * - Changed gpt structure names and members to be simpler and more Linux-like. 54 * 55 * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com> 56 * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck 57 * 58 * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com> 59 * - Changed function comments to DocBook style per Andreas Dilger suggestion. 60 * 61 * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com> 62 * - Change read_lba() to use the page cache per Al Viro's work. 63 * - print u64s properly on all architectures 64 * - fixed debug_printk(), now Dprintk() 65 * 66 * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com> 67 * - Style cleanups 68 * - made most functions static 69 * - Endianness addition 70 * - remove test for second alternate header, as it's not per spec, 71 * and is unnecessary. There's now a method to read/write the last 72 * sector of an odd-sized disk from user space. No tools have ever 73 * been released which used this code, so it's effectively dead. 74 * - Per Asit Mallick of Intel, added a test for a valid PMBR. 75 * - Added kernel command line option 'gpt' to override valid PMBR test. 76 * 77 * Wed Jun 6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com> 78 * - added devfs volume UUID support (/dev/volumes/uuids) for 79 * mounting file systems by the partition GUID. 80 * 81 * Tue Dec 5 2000 Matt Domsch <Matt_Domsch@dell.com> 82 * - Moved crc32() to linux/lib, added efi_crc32(). 83 * 84 * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com> 85 * - Replaced Intel's CRC32 function with an equivalent 86 * non-license-restricted version. 87 * 88 * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com> 89 * - Fixed the last_lba() call to return the proper last block 90 * 91 * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com> 92 * - Thanks to Andries Brouwer for his debugging assistance. 93 * - Code works, detects all the partitions. 94 * 95 ************************************************************/ 96 #include <linux/crc32.h> 97 #include <linux/ctype.h> 98 #include <linux/math64.h> 99 #include <linux/slab.h> 100 #include "check.h" 101 #include "efi.h" 102 103 /* This allows a kernel command line option 'gpt' to override 104 * the test for invalid PMBR. Not __initdata because reloading 105 * the partition tables happens after init too. 106 */ 107 static int force_gpt; 108 static int __init 109 force_gpt_fn(char *str) 110 { 111 force_gpt = 1; 112 return 1; 113 } 114 __setup("gpt", force_gpt_fn); 115 116 117 /** 118 * efi_crc32() - EFI version of crc32 function 119 * @buf: buffer to calculate crc32 of 120 * @len - length of buf 121 * 122 * Description: Returns EFI-style CRC32 value for @buf 123 * 124 * This function uses the little endian Ethernet polynomial 125 * but seeds the function with ~0, and xor's with ~0 at the end. 126 * Note, the EFI Specification, v1.02, has a reference to 127 * Dr. Dobbs Journal, May 1994 (actually it's in May 1992). 128 */ 129 static inline u32 130 efi_crc32(const void *buf, unsigned long len) 131 { 132 return (crc32(~0L, buf, len) ^ ~0L); 133 } 134 135 /** 136 * last_lba(): return number of last logical block of device 137 * @bdev: block device 138 * 139 * Description: Returns last LBA value on success, 0 on error. 140 * This is stored (by sd and ide-geometry) in 141 * the part[0] entry for this disk, and is the number of 142 * physical sectors available on the disk. 143 */ 144 static u64 last_lba(struct block_device *bdev) 145 { 146 if (!bdev || !bdev->bd_inode) 147 return 0; 148 return div_u64(bdev->bd_inode->i_size, 149 bdev_logical_block_size(bdev)) - 1ULL; 150 } 151 152 static inline int 153 pmbr_part_valid(struct partition *part) 154 { 155 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && 156 le32_to_cpu(part->start_sect) == 1UL) 157 return 1; 158 return 0; 159 } 160 161 /** 162 * is_pmbr_valid(): test Protective MBR for validity 163 * @mbr: pointer to a legacy mbr structure 164 * 165 * Description: Returns 1 if PMBR is valid, 0 otherwise. 166 * Validity depends on two things: 167 * 1) MSDOS signature is in the last two bytes of the MBR 168 * 2) One partition of type 0xEE is found 169 */ 170 static int 171 is_pmbr_valid(legacy_mbr *mbr) 172 { 173 int i; 174 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) 175 return 0; 176 for (i = 0; i < 4; i++) 177 if (pmbr_part_valid(&mbr->partition_record[i])) 178 return 1; 179 return 0; 180 } 181 182 /** 183 * read_lba(): Read bytes from disk, starting at given LBA 184 * @state 185 * @lba 186 * @buffer 187 * @size_t 188 * 189 * Description: Reads @count bytes from @state->bdev into @buffer. 190 * Returns number of bytes read on success, 0 on error. 191 */ 192 static size_t read_lba(struct parsed_partitions *state, 193 u64 lba, u8 *buffer, size_t count) 194 { 195 size_t totalreadcount = 0; 196 struct block_device *bdev = state->bdev; 197 sector_t n = lba * (bdev_logical_block_size(bdev) / 512); 198 199 if (!buffer || lba > last_lba(bdev)) 200 return 0; 201 202 while (count) { 203 int copied = 512; 204 Sector sect; 205 unsigned char *data = read_part_sector(state, n++, §); 206 if (!data) 207 break; 208 if (copied > count) 209 copied = count; 210 memcpy(buffer, data, copied); 211 put_dev_sector(sect); 212 buffer += copied; 213 totalreadcount +=copied; 214 count -= copied; 215 } 216 return totalreadcount; 217 } 218 219 /** 220 * alloc_read_gpt_entries(): reads partition entries from disk 221 * @state 222 * @gpt - GPT header 223 * 224 * Description: Returns ptes on success, NULL on error. 225 * Allocates space for PTEs based on information found in @gpt. 226 * Notes: remember to free pte when you're done! 227 */ 228 static gpt_entry *alloc_read_gpt_entries(struct parsed_partitions *state, 229 gpt_header *gpt) 230 { 231 size_t count; 232 gpt_entry *pte; 233 234 if (!gpt) 235 return NULL; 236 237 count = le32_to_cpu(gpt->num_partition_entries) * 238 le32_to_cpu(gpt->sizeof_partition_entry); 239 if (!count) 240 return NULL; 241 pte = kmalloc(count, GFP_KERNEL); 242 if (!pte) 243 return NULL; 244 245 if (read_lba(state, le64_to_cpu(gpt->partition_entry_lba), 246 (u8 *) pte, 247 count) < count) { 248 kfree(pte); 249 pte=NULL; 250 return NULL; 251 } 252 return pte; 253 } 254 255 /** 256 * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk 257 * @state 258 * @lba is the Logical Block Address of the partition table 259 * 260 * Description: returns GPT header on success, NULL on error. Allocates 261 * and fills a GPT header starting at @ from @state->bdev. 262 * Note: remember to free gpt when finished with it. 263 */ 264 static gpt_header *alloc_read_gpt_header(struct parsed_partitions *state, 265 u64 lba) 266 { 267 gpt_header *gpt; 268 unsigned ssz = bdev_logical_block_size(state->bdev); 269 270 gpt = kmalloc(ssz, GFP_KERNEL); 271 if (!gpt) 272 return NULL; 273 274 if (read_lba(state, lba, (u8 *) gpt, ssz) < ssz) { 275 kfree(gpt); 276 gpt=NULL; 277 return NULL; 278 } 279 280 return gpt; 281 } 282 283 /** 284 * is_gpt_valid() - tests one GPT header and PTEs for validity 285 * @state 286 * @lba is the logical block address of the GPT header to test 287 * @gpt is a GPT header ptr, filled on return. 288 * @ptes is a PTEs ptr, filled on return. 289 * 290 * Description: returns 1 if valid, 0 on error. 291 * If valid, returns pointers to newly allocated GPT header and PTEs. 292 */ 293 static int is_gpt_valid(struct parsed_partitions *state, u64 lba, 294 gpt_header **gpt, gpt_entry **ptes) 295 { 296 u32 crc, origcrc; 297 u64 lastlba; 298 299 if (!ptes) 300 return 0; 301 if (!(*gpt = alloc_read_gpt_header(state, lba))) 302 return 0; 303 304 /* Check the GUID Partition Table signature */ 305 if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) { 306 pr_debug("GUID Partition Table Header signature is wrong:" 307 "%lld != %lld\n", 308 (unsigned long long)le64_to_cpu((*gpt)->signature), 309 (unsigned long long)GPT_HEADER_SIGNATURE); 310 goto fail; 311 } 312 313 /* Check the GUID Partition Table header size is too big */ 314 if (le32_to_cpu((*gpt)->header_size) > 315 bdev_logical_block_size(state->bdev)) { 316 pr_debug("GUID Partition Table Header size is too large: %u > %u\n", 317 le32_to_cpu((*gpt)->header_size), 318 bdev_logical_block_size(state->bdev)); 319 goto fail; 320 } 321 322 /* Check the GUID Partition Table header size is too small */ 323 if (le32_to_cpu((*gpt)->header_size) < sizeof(gpt_header)) { 324 pr_debug("GUID Partition Table Header size is too small: %u < %zu\n", 325 le32_to_cpu((*gpt)->header_size), 326 sizeof(gpt_header)); 327 goto fail; 328 } 329 330 /* Check the GUID Partition Table CRC */ 331 origcrc = le32_to_cpu((*gpt)->header_crc32); 332 (*gpt)->header_crc32 = 0; 333 crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size)); 334 335 if (crc != origcrc) { 336 pr_debug("GUID Partition Table Header CRC is wrong: %x != %x\n", 337 crc, origcrc); 338 goto fail; 339 } 340 (*gpt)->header_crc32 = cpu_to_le32(origcrc); 341 342 /* Check that the my_lba entry points to the LBA that contains 343 * the GUID Partition Table */ 344 if (le64_to_cpu((*gpt)->my_lba) != lba) { 345 pr_debug("GPT my_lba incorrect: %lld != %lld\n", 346 (unsigned long long)le64_to_cpu((*gpt)->my_lba), 347 (unsigned long long)lba); 348 goto fail; 349 } 350 351 /* Check the first_usable_lba and last_usable_lba are 352 * within the disk. 353 */ 354 lastlba = last_lba(state->bdev); 355 if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) { 356 pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n", 357 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba), 358 (unsigned long long)lastlba); 359 goto fail; 360 } 361 if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) { 362 pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n", 363 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba), 364 (unsigned long long)lastlba); 365 goto fail; 366 } 367 368 /* Check that sizeof_partition_entry has the correct value */ 369 if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) { 370 pr_debug("GUID Partitition Entry Size check failed.\n"); 371 goto fail; 372 } 373 374 if (!(*ptes = alloc_read_gpt_entries(state, *gpt))) 375 goto fail; 376 377 /* Check the GUID Partition Entry Array CRC */ 378 crc = efi_crc32((const unsigned char *) (*ptes), 379 le32_to_cpu((*gpt)->num_partition_entries) * 380 le32_to_cpu((*gpt)->sizeof_partition_entry)); 381 382 if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) { 383 pr_debug("GUID Partitition Entry Array CRC check failed.\n"); 384 goto fail_ptes; 385 } 386 387 /* We're done, all's well */ 388 return 1; 389 390 fail_ptes: 391 kfree(*ptes); 392 *ptes = NULL; 393 fail: 394 kfree(*gpt); 395 *gpt = NULL; 396 return 0; 397 } 398 399 /** 400 * is_pte_valid() - tests one PTE for validity 401 * @pte is the pte to check 402 * @lastlba is last lba of the disk 403 * 404 * Description: returns 1 if valid, 0 on error. 405 */ 406 static inline int 407 is_pte_valid(const gpt_entry *pte, const u64 lastlba) 408 { 409 if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) || 410 le64_to_cpu(pte->starting_lba) > lastlba || 411 le64_to_cpu(pte->ending_lba) > lastlba) 412 return 0; 413 return 1; 414 } 415 416 /** 417 * compare_gpts() - Search disk for valid GPT headers and PTEs 418 * @pgpt is the primary GPT header 419 * @agpt is the alternate GPT header 420 * @lastlba is the last LBA number 421 * Description: Returns nothing. Sanity checks pgpt and agpt fields 422 * and prints warnings on discrepancies. 423 * 424 */ 425 static void 426 compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba) 427 { 428 int error_found = 0; 429 if (!pgpt || !agpt) 430 return; 431 if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) { 432 printk(KERN_WARNING 433 "GPT:Primary header LBA != Alt. header alternate_lba\n"); 434 printk(KERN_WARNING "GPT:%lld != %lld\n", 435 (unsigned long long)le64_to_cpu(pgpt->my_lba), 436 (unsigned long long)le64_to_cpu(agpt->alternate_lba)); 437 error_found++; 438 } 439 if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) { 440 printk(KERN_WARNING 441 "GPT:Primary header alternate_lba != Alt. header my_lba\n"); 442 printk(KERN_WARNING "GPT:%lld != %lld\n", 443 (unsigned long long)le64_to_cpu(pgpt->alternate_lba), 444 (unsigned long long)le64_to_cpu(agpt->my_lba)); 445 error_found++; 446 } 447 if (le64_to_cpu(pgpt->first_usable_lba) != 448 le64_to_cpu(agpt->first_usable_lba)) { 449 printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n"); 450 printk(KERN_WARNING "GPT:%lld != %lld\n", 451 (unsigned long long)le64_to_cpu(pgpt->first_usable_lba), 452 (unsigned long long)le64_to_cpu(agpt->first_usable_lba)); 453 error_found++; 454 } 455 if (le64_to_cpu(pgpt->last_usable_lba) != 456 le64_to_cpu(agpt->last_usable_lba)) { 457 printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n"); 458 printk(KERN_WARNING "GPT:%lld != %lld\n", 459 (unsigned long long)le64_to_cpu(pgpt->last_usable_lba), 460 (unsigned long long)le64_to_cpu(agpt->last_usable_lba)); 461 error_found++; 462 } 463 if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) { 464 printk(KERN_WARNING "GPT:disk_guids don't match.\n"); 465 error_found++; 466 } 467 if (le32_to_cpu(pgpt->num_partition_entries) != 468 le32_to_cpu(agpt->num_partition_entries)) { 469 printk(KERN_WARNING "GPT:num_partition_entries don't match: " 470 "0x%x != 0x%x\n", 471 le32_to_cpu(pgpt->num_partition_entries), 472 le32_to_cpu(agpt->num_partition_entries)); 473 error_found++; 474 } 475 if (le32_to_cpu(pgpt->sizeof_partition_entry) != 476 le32_to_cpu(agpt->sizeof_partition_entry)) { 477 printk(KERN_WARNING 478 "GPT:sizeof_partition_entry values don't match: " 479 "0x%x != 0x%x\n", 480 le32_to_cpu(pgpt->sizeof_partition_entry), 481 le32_to_cpu(agpt->sizeof_partition_entry)); 482 error_found++; 483 } 484 if (le32_to_cpu(pgpt->partition_entry_array_crc32) != 485 le32_to_cpu(agpt->partition_entry_array_crc32)) { 486 printk(KERN_WARNING 487 "GPT:partition_entry_array_crc32 values don't match: " 488 "0x%x != 0x%x\n", 489 le32_to_cpu(pgpt->partition_entry_array_crc32), 490 le32_to_cpu(agpt->partition_entry_array_crc32)); 491 error_found++; 492 } 493 if (le64_to_cpu(pgpt->alternate_lba) != lastlba) { 494 printk(KERN_WARNING 495 "GPT:Primary header thinks Alt. header is not at the end of the disk.\n"); 496 printk(KERN_WARNING "GPT:%lld != %lld\n", 497 (unsigned long long)le64_to_cpu(pgpt->alternate_lba), 498 (unsigned long long)lastlba); 499 error_found++; 500 } 501 502 if (le64_to_cpu(agpt->my_lba) != lastlba) { 503 printk(KERN_WARNING 504 "GPT:Alternate GPT header not at the end of the disk.\n"); 505 printk(KERN_WARNING "GPT:%lld != %lld\n", 506 (unsigned long long)le64_to_cpu(agpt->my_lba), 507 (unsigned long long)lastlba); 508 error_found++; 509 } 510 511 if (error_found) 512 printk(KERN_WARNING 513 "GPT: Use GNU Parted to correct GPT errors.\n"); 514 return; 515 } 516 517 /** 518 * find_valid_gpt() - Search disk for valid GPT headers and PTEs 519 * @state 520 * @gpt is a GPT header ptr, filled on return. 521 * @ptes is a PTEs ptr, filled on return. 522 * Description: Returns 1 if valid, 0 on error. 523 * If valid, returns pointers to newly allocated GPT header and PTEs. 524 * Validity depends on PMBR being valid (or being overridden by the 525 * 'gpt' kernel command line option) and finding either the Primary 526 * GPT header and PTEs valid, or the Alternate GPT header and PTEs 527 * valid. If the Primary GPT header is not valid, the Alternate GPT header 528 * is not checked unless the 'gpt' kernel command line option is passed. 529 * This protects against devices which misreport their size, and forces 530 * the user to decide to use the Alternate GPT. 531 */ 532 static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt, 533 gpt_entry **ptes) 534 { 535 int good_pgpt = 0, good_agpt = 0, good_pmbr = 0; 536 gpt_header *pgpt = NULL, *agpt = NULL; 537 gpt_entry *pptes = NULL, *aptes = NULL; 538 legacy_mbr *legacymbr; 539 u64 lastlba; 540 541 if (!ptes) 542 return 0; 543 544 lastlba = last_lba(state->bdev); 545 if (!force_gpt) { 546 /* This will be added to the EFI Spec. per Intel after v1.02. */ 547 legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL); 548 if (legacymbr) { 549 read_lba(state, 0, (u8 *) legacymbr, 550 sizeof (*legacymbr)); 551 good_pmbr = is_pmbr_valid(legacymbr); 552 kfree(legacymbr); 553 } 554 if (!good_pmbr) 555 goto fail; 556 } 557 558 good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA, 559 &pgpt, &pptes); 560 if (good_pgpt) 561 good_agpt = is_gpt_valid(state, 562 le64_to_cpu(pgpt->alternate_lba), 563 &agpt, &aptes); 564 if (!good_agpt && force_gpt) 565 good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes); 566 567 /* The obviously unsuccessful case */ 568 if (!good_pgpt && !good_agpt) 569 goto fail; 570 571 compare_gpts(pgpt, agpt, lastlba); 572 573 /* The good cases */ 574 if (good_pgpt) { 575 *gpt = pgpt; 576 *ptes = pptes; 577 kfree(agpt); 578 kfree(aptes); 579 if (!good_agpt) { 580 printk(KERN_WARNING 581 "Alternate GPT is invalid, " 582 "using primary GPT.\n"); 583 } 584 return 1; 585 } 586 else if (good_agpt) { 587 *gpt = agpt; 588 *ptes = aptes; 589 kfree(pgpt); 590 kfree(pptes); 591 printk(KERN_WARNING 592 "Primary GPT is invalid, using alternate GPT.\n"); 593 return 1; 594 } 595 596 fail: 597 kfree(pgpt); 598 kfree(agpt); 599 kfree(pptes); 600 kfree(aptes); 601 *gpt = NULL; 602 *ptes = NULL; 603 return 0; 604 } 605 606 /** 607 * efi_partition(struct parsed_partitions *state) 608 * @state 609 * 610 * Description: called from check.c, if the disk contains GPT 611 * partitions, sets up partition entries in the kernel. 612 * 613 * If the first block on the disk is a legacy MBR, 614 * it will get handled by msdos_partition(). 615 * If it's a Protective MBR, we'll handle it here. 616 * 617 * We do not create a Linux partition for GPT, but 618 * only for the actual data partitions. 619 * Returns: 620 * -1 if unable to read the partition table 621 * 0 if this isn't our partition table 622 * 1 if successful 623 * 624 */ 625 int efi_partition(struct parsed_partitions *state) 626 { 627 gpt_header *gpt = NULL; 628 gpt_entry *ptes = NULL; 629 u32 i; 630 unsigned ssz = bdev_logical_block_size(state->bdev) / 512; 631 632 if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) { 633 kfree(gpt); 634 kfree(ptes); 635 return 0; 636 } 637 638 pr_debug("GUID Partition Table is valid! Yea!\n"); 639 640 for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) { 641 struct partition_meta_info *info; 642 unsigned label_count = 0; 643 unsigned label_max; 644 u64 start = le64_to_cpu(ptes[i].starting_lba); 645 u64 size = le64_to_cpu(ptes[i].ending_lba) - 646 le64_to_cpu(ptes[i].starting_lba) + 1ULL; 647 648 if (!is_pte_valid(&ptes[i], last_lba(state->bdev))) 649 continue; 650 651 put_partition(state, i+1, start * ssz, size * ssz); 652 653 /* If this is a RAID volume, tell md */ 654 if (!efi_guidcmp(ptes[i].partition_type_guid, 655 PARTITION_LINUX_RAID_GUID)) 656 state->parts[i + 1].flags = ADDPART_FLAG_RAID; 657 658 info = &state->parts[i + 1].info; 659 efi_guid_unparse(&ptes[i].unique_partition_guid, info->uuid); 660 661 /* Naively convert UTF16-LE to 7 bits. */ 662 label_max = min(sizeof(info->volname) - 1, 663 sizeof(ptes[i].partition_name)); 664 info->volname[label_max] = 0; 665 while (label_count < label_max) { 666 u8 c = ptes[i].partition_name[label_count] & 0xff; 667 if (c && !isprint(c)) 668 c = '!'; 669 info->volname[label_count] = c; 670 label_count++; 671 } 672 state->parts[i + 1].has_info = true; 673 } 674 kfree(ptes); 675 kfree(gpt); 676 strlcat(state->pp_buf, "\n", PAGE_SIZE); 677 return 1; 678 } 679