Commit | Line | Data |
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1da177e4 LT |
1 | /************************************************************ |
2 | * EFI GUID Partition Table handling | |
7d13af32 KZ |
3 | * |
4 | * http://www.uefi.org/specs/ | |
5 | * http://www.intel.com/technology/efi/ | |
6 | * | |
1da177e4 LT |
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 | ************************************************************/ | |
1da177e4 | 96 | #include <linux/crc32.h> |
eec7ecfe | 97 | #include <linux/ctype.h> |
7d13af32 | 98 | #include <linux/math64.h> |
5a0e3ad6 | 99 | #include <linux/slab.h> |
1da177e4 LT |
100 | #include "check.h" |
101 | #include "efi.h" | |
102 | ||
1da177e4 LT |
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 | */ | |
1493bf21 | 144 | static u64 last_lba(struct block_device *bdev) |
1da177e4 LT |
145 | { |
146 | if (!bdev || !bdev->bd_inode) | |
147 | return 0; | |
7d13af32 KZ |
148 | return div_u64(bdev->bd_inode->i_size, |
149 | bdev_logical_block_size(bdev)) - 1ULL; | |
1da177e4 LT |
150 | } |
151 | ||
152 | static inline int | |
4c64c30a | 153 | pmbr_part_valid(struct partition *part) |
1da177e4 LT |
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 | |
1da177e4 LT |
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 | |
4c64c30a | 171 | is_pmbr_valid(legacy_mbr *mbr) |
1da177e4 LT |
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++) | |
4c64c30a | 177 | if (pmbr_part_valid(&mbr->partition_record[i])) |
1da177e4 LT |
178 | return 1; |
179 | return 0; | |
180 | } | |
181 | ||
182 | /** | |
183 | * read_lba(): Read bytes from disk, starting at given LBA | |
1493bf21 | 184 | * @state |
1da177e4 LT |
185 | * @lba |
186 | * @buffer | |
187 | * @size_t | |
188 | * | |
1493bf21 | 189 | * Description: Reads @count bytes from @state->bdev into @buffer. |
1da177e4 LT |
190 | * Returns number of bytes read on success, 0 on error. |
191 | */ | |
1493bf21 TH |
192 | static size_t read_lba(struct parsed_partitions *state, |
193 | u64 lba, u8 *buffer, size_t count) | |
1da177e4 LT |
194 | { |
195 | size_t totalreadcount = 0; | |
1493bf21 | 196 | struct block_device *bdev = state->bdev; |
7d13af32 | 197 | sector_t n = lba * (bdev_logical_block_size(bdev) / 512); |
1da177e4 | 198 | |
1493bf21 | 199 | if (!buffer || lba > last_lba(bdev)) |
1da177e4 LT |
200 | return 0; |
201 | ||
202 | while (count) { | |
203 | int copied = 512; | |
204 | Sector sect; | |
1493bf21 | 205 | unsigned char *data = read_part_sector(state, n++, §); |
1da177e4 LT |
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 | |
1493bf21 | 221 | * @state |
1da177e4 LT |
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 | */ | |
1493bf21 TH |
228 | static gpt_entry *alloc_read_gpt_entries(struct parsed_partitions *state, |
229 | gpt_header *gpt) | |
1da177e4 LT |
230 | { |
231 | size_t count; | |
232 | gpt_entry *pte; | |
1493bf21 TH |
233 | |
234 | if (!gpt) | |
1da177e4 LT |
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; | |
ea56505b | 241 | pte = kmalloc(count, GFP_KERNEL); |
1da177e4 LT |
242 | if (!pte) |
243 | return NULL; | |
1da177e4 | 244 | |
1493bf21 | 245 | if (read_lba(state, le64_to_cpu(gpt->partition_entry_lba), |
1da177e4 LT |
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 | |
1493bf21 | 257 | * @state |
1da177e4 LT |
258 | * @lba is the Logical Block Address of the partition table |
259 | * | |
260 | * Description: returns GPT header on success, NULL on error. Allocates | |
1493bf21 | 261 | * and fills a GPT header starting at @ from @state->bdev. |
1da177e4 LT |
262 | * Note: remember to free gpt when finished with it. |
263 | */ | |
1493bf21 TH |
264 | static gpt_header *alloc_read_gpt_header(struct parsed_partitions *state, |
265 | u64 lba) | |
1da177e4 LT |
266 | { |
267 | gpt_header *gpt; | |
1493bf21 | 268 | unsigned ssz = bdev_logical_block_size(state->bdev); |
1da177e4 | 269 | |
ea56505b | 270 | gpt = kmalloc(ssz, GFP_KERNEL); |
1da177e4 LT |
271 | if (!gpt) |
272 | return NULL; | |
1da177e4 | 273 | |
1493bf21 | 274 | if (read_lba(state, lba, (u8 *) gpt, ssz) < ssz) { |
1da177e4 LT |
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 | |
1493bf21 | 285 | * @state |
1da177e4 LT |
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 | */ | |
1493bf21 TH |
293 | static int is_gpt_valid(struct parsed_partitions *state, u64 lba, |
294 | gpt_header **gpt, gpt_entry **ptes) | |
1da177e4 LT |
295 | { |
296 | u32 crc, origcrc; | |
297 | u64 lastlba; | |
298 | ||
1493bf21 | 299 | if (!ptes) |
1da177e4 | 300 | return 0; |
1493bf21 | 301 | if (!(*gpt = alloc_read_gpt_header(state, lba))) |
1da177e4 LT |
302 | return 0; |
303 | ||
304 | /* Check the GUID Partition Table signature */ | |
305 | if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) { | |
d9916962 TG |
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); | |
1da177e4 LT |
310 | goto fail; |
311 | } | |
312 | ||
8b8a6e18 | 313 | /* Check the GUID Partition Table header size is too big */ |
3eb8e74e TW |
314 | if (le32_to_cpu((*gpt)->header_size) > |
315 | bdev_logical_block_size(state->bdev)) { | |
8b8a6e18 | 316 | pr_debug("GUID Partition Table Header size is too large: %u > %u\n", |
3eb8e74e TW |
317 | le32_to_cpu((*gpt)->header_size), |
318 | bdev_logical_block_size(state->bdev)); | |
319 | goto fail; | |
320 | } | |
321 | ||
8b8a6e18 PJ |
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 | ||
1da177e4 LT |
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) { | |
d9916962 TG |
336 | pr_debug("GUID Partition Table Header CRC is wrong: %x != %x\n", |
337 | crc, origcrc); | |
1da177e4 LT |
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) { | |
d9916962 TG |
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); | |
1da177e4 LT |
348 | goto fail; |
349 | } | |
350 | ||
351 | /* Check the first_usable_lba and last_usable_lba are | |
352 | * within the disk. | |
353 | */ | |
1493bf21 | 354 | lastlba = last_lba(state->bdev); |
1da177e4 | 355 | if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) { |
d9916962 TG |
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); | |
1da177e4 LT |
359 | goto fail; |
360 | } | |
361 | if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) { | |
d9916962 TG |
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); | |
1da177e4 LT |
365 | goto fail; |
366 | } | |
367 | ||
fa039d5f TW |
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 | ||
1493bf21 | 374 | if (!(*ptes = alloc_read_gpt_entries(state, *gpt))) |
1da177e4 LT |
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)) { | |
d9916962 | 383 | pr_debug("GUID Partitition Entry Array CRC check failed.\n"); |
1da177e4 LT |
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 | |
1493bf21 | 519 | * @state |
1da177e4 LT |
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 | */ | |
1493bf21 TH |
532 | static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt, |
533 | gpt_entry **ptes) | |
1da177e4 LT |
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; | |
4c64c30a | 538 | legacy_mbr *legacymbr; |
1da177e4 | 539 | u64 lastlba; |
1493bf21 TH |
540 | |
541 | if (!ptes) | |
1da177e4 LT |
542 | return 0; |
543 | ||
1493bf21 | 544 | lastlba = last_lba(state->bdev); |
1da177e4 LT |
545 | if (!force_gpt) { |
546 | /* This will be added to the EFI Spec. per Intel after v1.02. */ | |
f8314dc6 | 547 | legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL); |
1da177e4 | 548 | if (legacymbr) { |
1493bf21 TH |
549 | read_lba(state, 0, (u8 *) legacymbr, |
550 | sizeof (*legacymbr)); | |
4c64c30a | 551 | good_pmbr = is_pmbr_valid(legacymbr); |
1da177e4 | 552 | kfree(legacymbr); |
1da177e4 LT |
553 | } |
554 | if (!good_pmbr) | |
555 | goto fail; | |
556 | } | |
557 | ||
1493bf21 | 558 | good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA, |
1da177e4 LT |
559 | &pgpt, &pptes); |
560 | if (good_pgpt) | |
1493bf21 | 561 | good_agpt = is_gpt_valid(state, |
1da177e4 LT |
562 | le64_to_cpu(pgpt->alternate_lba), |
563 | &agpt, &aptes); | |
564 | if (!good_agpt && force_gpt) | |
1493bf21 | 565 | good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes); |
1da177e4 LT |
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 | /** | |
1493bf21 | 607 | * efi_partition(struct parsed_partitions *state) |
1da177e4 | 608 | * @state |
1da177e4 LT |
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 | */ | |
1493bf21 | 625 | int efi_partition(struct parsed_partitions *state) |
1da177e4 LT |
626 | { |
627 | gpt_header *gpt = NULL; | |
628 | gpt_entry *ptes = NULL; | |
629 | u32 i; | |
1493bf21 | 630 | unsigned ssz = bdev_logical_block_size(state->bdev) / 512; |
1da177e4 | 631 | |
1493bf21 | 632 | if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) { |
1da177e4 LT |
633 | kfree(gpt); |
634 | kfree(ptes); | |
635 | return 0; | |
636 | } | |
637 | ||
d9916962 | 638 | pr_debug("GUID Partition Table is valid! Yea!\n"); |
1da177e4 LT |
639 | |
640 | for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) { | |
eec7ecfe WD |
641 | struct partition_meta_info *info; |
642 | unsigned label_count = 0; | |
643 | unsigned label_max; | |
7d13af32 KZ |
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 | ||
1493bf21 | 648 | if (!is_pte_valid(&ptes[i], last_lba(state->bdev))) |
1da177e4 LT |
649 | continue; |
650 | ||
7d13af32 | 651 | put_partition(state, i+1, start * ssz, size * ssz); |
1da177e4 LT |
652 | |
653 | /* If this is a RAID volume, tell md */ | |
654 | if (!efi_guidcmp(ptes[i].partition_type_guid, | |
655 | PARTITION_LINUX_RAID_GUID)) | |
cc910624 | 656 | state->parts[i + 1].flags = ADDPART_FLAG_RAID; |
eec7ecfe WD |
657 | |
658 | info = &state->parts[i + 1].info; | |
1ad7e899 | 659 | efi_guid_unparse(&ptes[i].unique_partition_guid, info->uuid); |
eec7ecfe WD |
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; | |
1da177e4 LT |
673 | } |
674 | kfree(ptes); | |
675 | kfree(gpt); | |
9c867fbe | 676 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
677 | return 1; |
678 | } |