diff options
Diffstat (limited to 'common/partitions/efi.c')
-rw-r--r-- | common/partitions/efi.c | 339 |
1 files changed, 323 insertions, 16 deletions
diff --git a/common/partitions/efi.c b/common/partitions/efi.c index 848bed2261..9df40e3c15 100644 --- a/common/partitions/efi.c +++ b/common/partitions/efi.c @@ -20,7 +20,18 @@ #include <linux/ctype.h> #include <efi/partition.h> -#include "parser.h" +#include <partitions.h> + +struct efi_partition_desc { + struct partition_desc pd; + gpt_header *gpt; + gpt_entry *ptes; +}; + +struct efi_partition { + struct partition part; + gpt_entry *pte; +}; static const int force_gpt = IS_ENABLED(CONFIG_PARTITION_DISK_EFI_GPT_NO_FORCE); @@ -80,6 +91,7 @@ static gpt_entry *alloc_read_gpt_entries(struct block_device *blk, if (!count) return NULL; + pte = kzalloc(count, GFP_KERNEL); if (!pte) return NULL; @@ -206,7 +218,8 @@ static int is_gpt_valid(struct block_device *blk, u64 lba, le32_to_cpu((*gpt)->sizeof_partition_entry)); if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) { - dev_dbg(blk->dev, "GUID Partitition Entry Array CRC check failed.\n"); + dev_dbg(blk->dev, "GUID Partitition Entry Array CRC check failed: 0x%08x 0x%08x\n", + crc, le32_to_cpu((*gpt)->partition_entry_array_crc32)); goto fail_ptes; } @@ -232,7 +245,7 @@ static int is_gpt_valid(struct block_device *blk, u64 lba, static inline int is_pte_valid(const gpt_entry *pte, const u64 lastlba) { - if ((!efi_guidcmp(pte->partition_type_guid, EFI_NULL_GUID)) || + if (guid_is_null(&pte->partition_type_guid) || le64_to_cpu(pte->starting_lba) > lastlba || le64_to_cpu(pte->ending_lba) > lastlba) return 0; @@ -249,7 +262,8 @@ is_pte_valid(const gpt_entry *pte, const u64 lastlba) * */ static void -compare_gpts(struct device_d *dev, gpt_header *pgpt, gpt_header *agpt, u64 lastlba) +compare_gpts(struct device *dev, gpt_header *pgpt, gpt_header *agpt, + u64 lastlba) { int error_found = 0; if (!pgpt || !agpt) @@ -286,7 +300,7 @@ compare_gpts(struct device_d *dev, gpt_header *pgpt, gpt_header *agpt, u64 lastl (unsigned long long)le64_to_cpu(agpt->last_usable_lba)); error_found++; } - if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) { + if (!guid_equal(&pgpt->disk_guid, &agpt->disk_guid)) { dev_warn(dev, "GPT:disk_guids don't match.\n"); error_found++; } @@ -430,22 +444,53 @@ static void part_set_efi_name(gpt_entry *pte, char *dest) dest[i] = 0; } -static void efi_partition(void *buf, struct block_device *blk, - struct partition_desc *pd) +static void extract_flags(const gpt_entry *p, struct partition *pentry) +{ + static const guid_t system_guid = PARTITION_SYSTEM_GUID; + + if (p->attributes.required_to_function) + pentry->flags |= DEVFS_PARTITION_REQUIRED; + if (p->attributes.no_block_io_protocol) + pentry->flags |= DEVFS_PARTITION_NO_EXPORT; + if (p->attributes.legacy_bios_bootable) + pentry->flags |= DEVFS_PARTITION_BOOTABLE_LEGACY; + + if (guid_equal(&p->partition_type_guid, &system_guid)) + pentry->flags |= DEVFS_PARTITION_BOOTABLE_ESP; + + pentry->typeflags = p->attributes.type_guid_specific; +} + +static void part_get_efi_name(gpt_entry *pte, const char *src) +{ + int i; + int len = strlen(src); + + for (i = 0; i < GPT_PARTNAME_MAX_SIZE ; i++) { + if (i <= len) + pte->partition_name[i] = src[i]; + else + pte->partition_name[i] = 0; + } +} + +static struct partition_desc *efi_partition(void *buf, struct block_device *blk) { gpt_header *gpt = NULL; gpt_entry *ptes = NULL; int i = 0; int nb_part; + struct efi_partition *epart; struct partition *pentry; + struct efi_partition_desc *epd = NULL; - if (!find_valid_gpt(buf, blk, &gpt, &ptes) || !gpt || !ptes) { - kfree(gpt); - kfree(ptes); - return; - } + if (!find_valid_gpt(buf, blk, &gpt, &ptes) || !gpt || !ptes) + goto out; + + snprintf(blk->cdev.diskuuid, sizeof(blk->cdev.diskuuid), "%pUl", &gpt->disk_guid); + dev_add_param_string_fixed(blk->dev, "guid", blk->cdev.diskuuid); - snprintf(blk->cdev.uuid, sizeof(blk->cdev.uuid), "%pUl", &gpt->disk_guid); + blk->cdev.flags |= DEVFS_IS_GPT_PARTITIONED; nb_part = le32_to_cpu(gpt->num_partition_entries); @@ -455,25 +500,287 @@ static void efi_partition(void *buf, struct block_device *blk, nb_part = MAX_PARTITION; } + epd = xzalloc(sizeof(*epd)); + partition_desc_init(&epd->pd, blk); + + epd->gpt = gpt; + epd->ptes = ptes; + for (i = 0; i < nb_part; i++) { if (!is_pte_valid(&ptes[i], last_lba(blk))) { dev_dbg(blk->dev, "Invalid pte %d\n", i); - return; + continue; } - pentry = &pd->parts[pd->used_entries]; + epart = xzalloc(sizeof(*epart)); + epart->pte = &ptes[i]; + pentry = &epart->part; + extract_flags(&ptes[i], pentry); pentry->first_sec = le64_to_cpu(ptes[i].starting_lba); pentry->size = le64_to_cpu(ptes[i].ending_lba) - pentry->first_sec; pentry->size++; part_set_efi_name(&ptes[i], pentry->name); snprintf(pentry->partuuid, sizeof(pentry->partuuid), "%pUl", &ptes[i].unique_partition_guid); - pd->used_entries++; + pentry->typeuuid = ptes[i].partition_type_guid; + pentry->num = i; + list_add_tail(&pentry->list, &epd->pd.partitions); + } +out: + + return &epd->pd; +} + +static void efi_partition_free(struct partition_desc *pd) +{ + struct efi_partition_desc *epd = container_of(pd, struct efi_partition_desc, pd); + struct partition *part, *tmp; + + list_for_each_entry_safe(part, tmp, &pd->partitions, list) { + struct efi_partition *epart = container_of(part, struct efi_partition, part); + + free(epart); } + + free(epd->ptes); + free(epd->gpt); + free(epd); +} + +static __maybe_unused struct partition_desc *efi_partition_create_table(struct block_device *blk) +{ + struct efi_partition_desc *epd = xzalloc(sizeof(*epd)); + gpt_header *gpt; + + partition_desc_init(&epd->pd, blk); + + epd->gpt = xzalloc(512); + gpt = epd->gpt; + + gpt->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); + gpt->revision = cpu_to_le32(0x100); + gpt->header_size = cpu_to_le32(sizeof(*gpt)); + gpt->my_lba = cpu_to_le64(1); + gpt->alternate_lba = cpu_to_le64(last_lba(blk)); + gpt->first_usable_lba = cpu_to_le64(34); + gpt->last_usable_lba = cpu_to_le64(last_lba(blk) - 34);; + generate_random_guid((unsigned char *)&gpt->disk_guid); + gpt->partition_entry_lba = cpu_to_le64(2); + gpt->num_partition_entries = cpu_to_le32(128); + gpt->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); + + pr_info("Created new disk label with GUID %pU\n", &gpt->disk_guid); + + epd->ptes = xzalloc(128 * sizeof(gpt_entry)); + + return &epd->pd; +} + +static guid_t partition_linux_data_guid = PARTITION_LINUX_DATA_GUID; +static guid_t partition_basic_data_guid = PARTITION_BASIC_DATA_GUID; +static guid_t partition_barebox_env_guid = PARTITION_BAREBOX_ENVIRONMENT_GUID; + +static const guid_t *fs_type_to_guid(const char *fstype) +{ + if (!strcmp(fstype, "ext2")) + return &partition_linux_data_guid; + if (!strcmp(fstype, "ext3")) + return &partition_linux_data_guid; + if (!strcmp(fstype, "ext4")) + return &partition_linux_data_guid; + if (!strcmp(fstype, "fat16")) + return &partition_basic_data_guid; + if (!strcmp(fstype, "fat32")) + return &partition_basic_data_guid; + if (!strcmp(fstype, "bbenv")) + return &partition_barebox_env_guid; + + return NULL; +} + +static __maybe_unused int efi_partition_mkpart(struct partition_desc *pd, + const char *name, const char *fs_type, + uint64_t start_lba, uint64_t end_lba) +{ + struct efi_partition_desc *epd = container_of(pd, struct efi_partition_desc, pd); + struct efi_partition *epart; + struct partition *part; + gpt_header *gpt = epd->gpt; + int num_parts = le32_to_cpu(gpt->num_partition_entries); + gpt_entry *pte; + int i; + const guid_t *guid; + + if (start_lba < 34) { + pr_err("invalid start LBA %lld, minimum is 34\n", start_lba); + return -EINVAL; + } + + if (end_lba >= last_lba(pd->blk) - 33) { + pr_err("invalid end LBA %lld, maximum is %lld\n", start_lba, + last_lba(pd->blk) - 33); + return -EINVAL; + } + + for (i = 0; i < num_parts; i++) { + if (!is_pte_valid(&epd->ptes[i], last_lba(pd->blk))) + break; + } + + if (i == num_parts) { + pr_err("partition table is full\n"); + return -ENOSPC; + } + + guid = fs_type_to_guid(fs_type); + if (!guid) { + pr_err("Unknown fs type %s\n", fs_type); + return -EINVAL; + } + + pte = &epd->ptes[i]; + epart = xzalloc(sizeof(*epart)); + part = &epart->part; + + part->first_sec = start_lba; + part->size = end_lba - start_lba + 1; + part->typeuuid = *guid; + + pte->partition_type_guid = *guid; + generate_random_guid((unsigned char *)&pte->unique_partition_guid); + pte->starting_lba = cpu_to_le64(start_lba); + pte->ending_lba = cpu_to_le64(end_lba); + part_get_efi_name(pte, name); + part_set_efi_name(pte, part->name); + part->num = i; + + list_add_tail(&part->list, &pd->partitions); + + return 0; +} + +static __maybe_unused int efi_partition_rmpart(struct partition_desc *pd, struct partition *part) +{ + struct efi_partition *epart = container_of(part, struct efi_partition, part); + + memset(epart->pte, 0, sizeof(*epart->pte)); + + list_del(&part->list); + free(epart); + + return 0; +} + +static int efi_protective_mbr(struct block_device *blk) +{ + struct partition_desc *pdesc; + int ret; + + pdesc = partition_table_new(blk, "msdos"); + if (IS_ERR(pdesc)) { + printf("Error: Cannot create partition table: %pe\n", pdesc); + return PTR_ERR(pdesc); + } + + ret = partition_create(pdesc, "primary", "0xee", 1, last_lba(blk)); + if (ret) { + pr_err("Cannot create partition: %pe\n", ERR_PTR(ret)); + goto out; + } + + ret = partition_table_write(pdesc); + if (ret) { + pr_err("Cannot write partition: %pe\n", ERR_PTR(ret)); + goto out; + } +out: + partition_table_free(pdesc); + + return ret; +} + +static __maybe_unused int efi_partition_write(struct partition_desc *pd) +{ + struct block_device *blk = pd->blk; + struct efi_partition_desc *epd = container_of(pd, struct efi_partition_desc, pd); + gpt_header *gpt = epd->gpt, *altgpt; + int ret; + uint32_t count; + uint64_t from, size; + + if (le32_to_cpu(gpt->num_partition_entries) != 128) { + /* + * This is not yet properly implemented. At least writing of the + * alternative GPT is not correctly implemented for this case as + * we can't assume that the partition entries are written at + * last_lba() - 32, we would have to calculate that from the number + * of partition entries. + */ + pr_err("num_partition_entries is != 128. This is not yet supported for writing\n"); + return -EINVAL; + } + + count = le32_to_cpu(gpt->num_partition_entries) * + le32_to_cpu(gpt->sizeof_partition_entry); + + gpt->my_lba = cpu_to_le64(1); + gpt->partition_entry_array_crc32 = cpu_to_le32(efi_crc32( + (const unsigned char *)epd->ptes, count)); + gpt->header_crc32 = 0; + gpt->header_crc32 = cpu_to_le32(efi_crc32((const unsigned char *)gpt, + le32_to_cpu(gpt->header_size))); + + ret = efi_protective_mbr(blk); + if (ret) + return ret; + + ret = block_write(blk, gpt, 1, 1); + if (ret) + goto err_block_write; + + from = le64_to_cpu(gpt->partition_entry_lba); + size = count / GPT_BLOCK_SIZE; + + ret = block_write(blk, epd->ptes, from, size); + if (ret) + goto err_block_write; + + altgpt = xmemdup(gpt, SECTOR_SIZE); + + altgpt->alternate_lba = cpu_to_le64(1); + altgpt->my_lba = cpu_to_le64(last_lba(blk)); + altgpt->partition_entry_lba = cpu_to_le64(last_lba(blk) - 32); + altgpt->header_crc32 = 0; + altgpt->header_crc32 = cpu_to_le32(efi_crc32((const unsigned char *)altgpt, + le32_to_cpu(altgpt->header_size))); + ret = block_write(blk, altgpt, last_lba(blk), 1); + + free(altgpt); + + if (ret) + goto err_block_write; + ret = block_write(blk, epd->ptes, last_lba(blk) - 32, 32); + if (ret) + goto err_block_write; + + return 0; + +err_block_write: + pr_err("Cannot write to block device: %pe\n", ERR_PTR(ret)); + + return ret; } static struct partition_parser efi_partition_parser = { .parse = efi_partition, + .partition_free = efi_partition_free, +#ifdef CONFIG_PARTITION_MANIPULATION + .create = efi_partition_create_table, + .mkpart = efi_partition_mkpart, + .rmpart = efi_partition_rmpart, + .write = efi_partition_write, +#endif .type = filetype_gpt, + .name = "gpt", }; static int efi_partition_init(void) |