diff options
Diffstat (limited to 'disk/part_efi.c')
| -rw-r--r-- | disk/part_efi.c | 89 |
1 files changed, 49 insertions, 40 deletions
diff --git a/disk/part_efi.c b/disk/part_efi.c index 359b55a818..51fa4a74ab 100644 --- a/disk/part_efi.c +++ b/disk/part_efi.c @@ -51,6 +51,8 @@ static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc, gpt_header *pgpt_head); static int is_pte_valid(gpt_entry * pte); +static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head, + gpt_entry **pgpt_pte); static char *print_efiname(gpt_entry *pte) { @@ -192,19 +194,8 @@ int get_disk_guid(struct blk_desc * dev_desc, char *guid) unsigned char *guid_bin; /* This function validates AND fills in the GPT header and PTE */ - if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, - gpt_head, &gpt_pte) != 1) { - printf("%s: *** ERROR: Invalid GPT ***\n", __func__); - if (is_gpt_valid(dev_desc, dev_desc->lba - 1, - gpt_head, &gpt_pte) != 1) { - printf("%s: *** ERROR: Invalid Backup GPT ***\n", - __func__); - return -EINVAL; - } else { - printf("%s: *** Using Backup GPT ***\n", - __func__); - } - } + if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1) + return -EINVAL; guid_bin = gpt_head->disk_guid.b; uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID); @@ -223,19 +214,8 @@ void part_print_efi(struct blk_desc *dev_desc) unsigned char *uuid_bin; /* This function validates AND fills in the GPT header and PTE */ - if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, - gpt_head, &gpt_pte) != 1) { - printf("%s: *** ERROR: Invalid GPT ***\n", __func__); - if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), - gpt_head, &gpt_pte) != 1) { - printf("%s: *** ERROR: Invalid Backup GPT ***\n", - __func__); - return; - } else { - printf("%s: *** Using Backup GPT ***\n", - __func__); - } - } + if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1) + return; debug("%s: gpt-entry at %p\n", __func__, gpt_pte); @@ -284,19 +264,8 @@ int part_get_info_efi(struct blk_desc *dev_desc, int part, } /* This function validates AND fills in the GPT header and PTE */ - if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, - gpt_head, &gpt_pte) != 1) { - printf("%s: *** ERROR: Invalid GPT ***\n", __func__); - if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), - gpt_head, &gpt_pte) != 1) { - printf("%s: *** ERROR: Invalid Backup GPT ***\n", - __func__); - return -1; - } else { - printf("%s: *** Using Backup GPT ***\n", - __func__); - } - } + if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1) + return -1; if (part > le32_to_cpu(gpt_head->num_partition_entries) || !is_pte_valid(&gpt_pte[part - 1])) { @@ -939,7 +908,7 @@ static int is_pmbr_valid(legacy_mbr * mbr) * gpt is a GPT header ptr, filled on return. * ptes is a PTEs ptr, filled on return. * - * Description: returns 1 if valid, 0 on error. + * Description: returns 1 if valid, 0 on error, 2 if ignored header * If valid, returns pointers to PTEs. */ static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, @@ -965,6 +934,12 @@ static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, return 0; } + /* Invalid but nothing to yell about. */ + if (le64_to_cpu(pgpt_head->signature) == GPT_HEADER_CHROMEOS_IGNORE) { + debug("ChromeOS 'IGNOREME' GPT header found and ignored\n"); + return 2; + } + if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba)) return 0; @@ -997,6 +972,40 @@ static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, } /** + * find_valid_gpt() - finds a valid GPT header and PTEs + * + * gpt is a GPT header ptr, filled on return. + * ptes is a PTEs ptr, filled on return. + * + * Description: returns 1 if found a valid gpt, 0 on error. + * If valid, returns pointers to PTEs. + */ +static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head, + gpt_entry **pgpt_pte) +{ + int r; + + r = is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, gpt_head, + pgpt_pte); + + if (r != 1) { + if (r != 2) + printf("%s: *** ERROR: Invalid GPT ***\n", __func__); + + if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), gpt_head, + pgpt_pte) != 1) { + printf("%s: *** ERROR: Invalid Backup GPT ***\n", + __func__); + return 0; + } + if (r != 2) + printf("%s: *** Using Backup GPT ***\n", + __func__); + } + return 1; +} + +/** * alloc_read_gpt_entries(): reads partition entries from disk * @dev_desc * @gpt - GPT header |