* TODO:
*
* Changelog:
+ * Mon August 5th, 2013 Davidlohr Bueso <davidlohr@hp.com>
+ * - detect hybrid MBRs, tighter pMBR checking & cleanups.
+ *
* Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
* - test for valid PMBR and valid PGPT before ever reading
* AGPT, allow override with 'gpt' kernel command line option.
bdev_logical_block_size(bdev)) - 1ULL;
}
-static inline int
-pmbr_part_valid(struct partition *part)
+static inline int pmbr_part_valid(gpt_mbr_record *part)
{
- if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
- le32_to_cpu(part->start_sect) == 1UL)
- return 1;
- return 0;
+ if (part->os_type != EFI_PMBR_OSTYPE_EFI_GPT)
+ goto invalid;
+
+ /* set to 0x00000001 (i.e., the LBA of the GPT Partition Header) */
+ if (le32_to_cpu(part->starting_lba) != GPT_PRIMARY_PARTITION_TABLE_LBA)
+ goto invalid;
+
+ return GPT_MBR_PROTECTIVE;
+invalid:
+ return 0;
}
/**
* is_pmbr_valid(): test Protective MBR for validity
* @mbr: pointer to a legacy mbr structure
+ * @total_sectors: amount of sectors in the device
*
- * Description: Returns 1 if PMBR is valid, 0 otherwise.
- * Validity depends on two things:
+ * Description: Checks for a valid protective or hybrid
+ * master boot record (MBR). The validity of a pMBR depends
+ * on all of the following properties:
* 1) MSDOS signature is in the last two bytes of the MBR
* 2) One partition of type 0xEE is found
+ *
+ * In addition, a hybrid MBR will have up to three additional
+ * primary partitions, which point to the same space that's
+ * marked out by up to three GPT partitions.
+ *
+ * Returns 0 upon invalid MBR, or GPT_MBR_PROTECTIVE or
+ * GPT_MBR_HYBRID depending on the device layout.
*/
-static int
-is_pmbr_valid(legacy_mbr *mbr)
+static int is_pmbr_valid(legacy_mbr *mbr, sector_t total_sectors)
{
- int i;
+ int i, part = 0, ret = 0; /* invalid by default */
+
if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
- return 0;
+ goto done;
+
+ for (i = 0; i < 4; i++) {
+ ret = pmbr_part_valid(&mbr->partition_record[i]);
+ if (ret == GPT_MBR_PROTECTIVE) {
+ part = i;
+ /*
+ * Ok, we at least know that there's a protective MBR,
+ * now check if there are other partition types for
+ * hybrid MBR.
+ */
+ goto check_hybrid;
+ }
+ }
+
+ if (ret != GPT_MBR_PROTECTIVE)
+ goto done;
+check_hybrid:
for (i = 0; i < 4; i++)
- if (pmbr_part_valid(&mbr->partition_record[i]))
- return 1;
- return 0;
+ if ((mbr->partition_record[i].os_type !=
+ EFI_PMBR_OSTYPE_EFI_GPT) &&
+ (mbr->partition_record[i].os_type != 0x00))
+ ret = GPT_MBR_HYBRID;
+
+ /*
+ * Protective MBRs take up the lesser of the whole disk
+ * or 2 TiB (32bit LBA), ignoring the rest of the disk.
+ *
+ * Hybrid MBRs do not necessarily comply with this.
+ */
+ if (ret == GPT_MBR_PROTECTIVE) {
+ if (le32_to_cpu(mbr->partition_record[part].size_in_lba) !=
+ min((uint32_t) total_sectors - 1, 0xFFFFFFFF))
+ ret = 0;
+ }
+done:
+ return ret;
}
/**
return NULL;
if (read_lba(state, le64_to_cpu(gpt->partition_entry_lba),
- (u8 *) pte,
- count) < count) {
+ (u8 *) pte, count) < count) {
kfree(pte);
pte=NULL;
return NULL;
(unsigned long long)lastlba);
goto fail;
}
-
+ if (le64_to_cpu((*gpt)->last_usable_lba) < le64_to_cpu((*gpt)->first_usable_lba)) {
+ pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
+ (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
+ (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba));
+ goto fail;
+ }
/* Check that sizeof_partition_entry has the correct value */
if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) {
pr_debug("GUID Partitition Entry Size check failed.\n");
if (!pgpt || !agpt)
return;
if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
- printk(KERN_WARNING
- "GPT:Primary header LBA != Alt. header alternate_lba\n");
- printk(KERN_WARNING "GPT:%lld != %lld\n",
+ pr_warn("GPT:Primary header LBA != Alt. header alternate_lba\n");
+ pr_warn("GPT:%lld != %lld\n",
(unsigned long long)le64_to_cpu(pgpt->my_lba),
(unsigned long long)le64_to_cpu(agpt->alternate_lba));
error_found++;
}
if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
- printk(KERN_WARNING
- "GPT:Primary header alternate_lba != Alt. header my_lba\n");
- printk(KERN_WARNING "GPT:%lld != %lld\n",
+ pr_warn("GPT:Primary header alternate_lba != Alt. header my_lba\n");
+ pr_warn("GPT:%lld != %lld\n",
(unsigned long long)le64_to_cpu(pgpt->alternate_lba),
(unsigned long long)le64_to_cpu(agpt->my_lba));
error_found++;
}
if (le64_to_cpu(pgpt->first_usable_lba) !=
le64_to_cpu(agpt->first_usable_lba)) {
- printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n");
- printk(KERN_WARNING "GPT:%lld != %lld\n",
+ pr_warn("GPT:first_usable_lbas don't match.\n");
+ pr_warn("GPT:%lld != %lld\n",
(unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
(unsigned long long)le64_to_cpu(agpt->first_usable_lba));
error_found++;
}
if (le64_to_cpu(pgpt->last_usable_lba) !=
le64_to_cpu(agpt->last_usable_lba)) {
- printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n");
- printk(KERN_WARNING "GPT:%lld != %lld\n",
+ pr_warn("GPT:last_usable_lbas don't match.\n");
+ pr_warn("GPT:%lld != %lld\n",
(unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
(unsigned long long)le64_to_cpu(agpt->last_usable_lba));
error_found++;
}
if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
- printk(KERN_WARNING "GPT:disk_guids don't match.\n");
+ pr_warn("GPT:disk_guids don't match.\n");
error_found++;
}
if (le32_to_cpu(pgpt->num_partition_entries) !=
le32_to_cpu(agpt->num_partition_entries)) {
- printk(KERN_WARNING "GPT:num_partition_entries don't match: "
+ pr_warn("GPT:num_partition_entries don't match: "
"0x%x != 0x%x\n",
le32_to_cpu(pgpt->num_partition_entries),
le32_to_cpu(agpt->num_partition_entries));
}
if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
le32_to_cpu(agpt->sizeof_partition_entry)) {
- printk(KERN_WARNING
- "GPT:sizeof_partition_entry values don't match: "
+ pr_warn("GPT:sizeof_partition_entry values don't match: "
"0x%x != 0x%x\n",
le32_to_cpu(pgpt->sizeof_partition_entry),
le32_to_cpu(agpt->sizeof_partition_entry));
}
if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
le32_to_cpu(agpt->partition_entry_array_crc32)) {
- printk(KERN_WARNING
- "GPT:partition_entry_array_crc32 values don't match: "
+ pr_warn("GPT:partition_entry_array_crc32 values don't match: "
"0x%x != 0x%x\n",
le32_to_cpu(pgpt->partition_entry_array_crc32),
le32_to_cpu(agpt->partition_entry_array_crc32));
error_found++;
}
if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
- printk(KERN_WARNING
- "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
- printk(KERN_WARNING "GPT:%lld != %lld\n",
+ pr_warn("GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
+ pr_warn("GPT:%lld != %lld\n",
(unsigned long long)le64_to_cpu(pgpt->alternate_lba),
(unsigned long long)lastlba);
error_found++;
}
if (le64_to_cpu(agpt->my_lba) != lastlba) {
- printk(KERN_WARNING
- "GPT:Alternate GPT header not at the end of the disk.\n");
- printk(KERN_WARNING "GPT:%lld != %lld\n",
+ pr_warn("GPT:Alternate GPT header not at the end of the disk.\n");
+ pr_warn("GPT:%lld != %lld\n",
(unsigned long long)le64_to_cpu(agpt->my_lba),
(unsigned long long)lastlba);
error_found++;
}
if (error_found)
- printk(KERN_WARNING
- "GPT: Use GNU Parted to correct GPT errors.\n");
+ pr_warn("GPT: Use GNU Parted to correct GPT errors.\n");
return;
}
gpt_header *pgpt = NULL, *agpt = NULL;
gpt_entry *pptes = NULL, *aptes = NULL;
legacy_mbr *legacymbr;
+ sector_t total_sectors = i_size_read(state->bdev->bd_inode) >> 9;
u64 lastlba;
if (!ptes)
lastlba = last_lba(state->bdev);
if (!force_gpt) {
- /* This will be added to the EFI Spec. per Intel after v1.02. */
- legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL);
- if (legacymbr) {
- read_lba(state, 0, (u8 *) legacymbr,
- sizeof (*legacymbr));
- good_pmbr = is_pmbr_valid(legacymbr);
- kfree(legacymbr);
- }
- if (!good_pmbr)
- goto fail;
- }
+ /* This will be added to the EFI Spec. per Intel after v1.02. */
+ legacymbr = kzalloc(sizeof(*legacymbr), GFP_KERNEL);
+ if (!legacymbr)
+ goto fail;
+
+ read_lba(state, 0, (u8 *)legacymbr, sizeof(*legacymbr));
+ good_pmbr = is_pmbr_valid(legacymbr, total_sectors);
+ kfree(legacymbr);
+
+ if (!good_pmbr)
+ goto fail;
+
+ pr_debug("Device has a %s MBR\n",
+ good_pmbr == GPT_MBR_PROTECTIVE ?
+ "protective" : "hybrid");
+ }
good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA,
&pgpt, &pptes);
*ptes = pptes;
kfree(agpt);
kfree(aptes);
- if (!good_agpt) {
- printk(KERN_WARNING
- "Alternate GPT is invalid, "
- "using primary GPT.\n");
- }
+ if (!good_agpt)
+ pr_warn("Alternate GPT is invalid, using primary GPT.\n");
return 1;
}
else if (good_agpt) {
*ptes = aptes;
kfree(pgpt);
kfree(pptes);
- printk(KERN_WARNING
- "Primary GPT is invalid, using alternate GPT.\n");
+ pr_warn("Primary GPT is invalid, using alternate GPT.\n");
return 1;
}
put_partition(state, i+1, start * ssz, size * ssz);
/* If this is a RAID volume, tell md */
- if (!efi_guidcmp(ptes[i].partition_type_guid,
- PARTITION_LINUX_RAID_GUID))
+ if (!efi_guidcmp(ptes[i].partition_type_guid, PARTITION_LINUX_RAID_GUID))
state->parts[i + 1].flags = ADDPART_FLAG_RAID;
info = &state->parts[i + 1].info;
projects / deliverable / linux.git / blobdiff