diff options
| -rw-r--r-- | disk/part_efi.c | 6 | ||||
| -rw-r--r-- | include/part_efi.h | 3 |
2 files changed, 6 insertions, 3 deletions
diff --git a/disk/part_efi.c b/disk/part_efi.c index 72e3997..5c1039f 100644 --- a/disk/part_efi.c +++ b/disk/part_efi.c @@ -350,8 +350,6 @@ static int set_protective_mbr(struct blk_desc *dev_desc) { /* Setup the Protective MBR */ ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->blksz); - memset(p_mbr, 0, sizeof(*p_mbr)); - if (p_mbr == NULL) { printf("%s: calloc failed!\n", __func__); return -1; @@ -363,6 +361,10 @@ static int set_protective_mbr(struct blk_desc *dev_desc) return -1; } + /* Clear all data in MBR except of backed up boot code */ + memset((char *)p_mbr + MSDOS_MBR_BOOT_CODE_SIZE, 0, sizeof(*p_mbr) - + MSDOS_MBR_BOOT_CODE_SIZE); + /* Append signature */ p_mbr->signature = MSDOS_MBR_SIGNATURE; p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT; diff --git a/include/part_efi.h b/include/part_efi.h index 6065c57..8525770 100644 --- a/include/part_efi.h +++ b/include/part_efi.h @@ -20,6 +20,7 @@ #include <efi.h> #define MSDOS_MBR_SIGNATURE 0xAA55 +#define MSDOS_MBR_BOOT_CODE_SIZE 440 #define EFI_PMBR_OSTYPE_EFI 0xEF #define EFI_PMBR_OSTYPE_EFI_GPT 0xEE @@ -111,7 +112,7 @@ typedef struct _gpt_entry { } __packed gpt_entry; typedef struct _legacy_mbr { - u8 boot_code[440]; + u8 boot_code[MSDOS_MBR_BOOT_CODE_SIZE]; __le32 unique_mbr_signature; __le16 unknown; struct partition partition_record[4]; |