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gpt: use inline functions for checking status bits

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This should prevent bugs like 6078f836 and 4268f3da.
This commit is contained in:
Michael Marineau 2016-09-20 12:43:01 -07:00
parent 4268f3da52
commit 3dda6a863a
4 changed files with 39 additions and 13 deletions
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35
include/grub/gpt_partition.h
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@ -161,13 +161,6 @@ typedef enum grub_gpt_status
GRUB_GPT_BACKUP_ENTRIES_VALID = 0x20,
} grub_gpt_status_t;
#define GRUB_GPT_MBR_VALID (GRUB_GPT_PROTECTIVE_MBR|GRUB_GPT_HYBRID_MBR)
#define GRUB_GPT_PRIMARY_VALID \
(GRUB_GPT_PRIMARY_HEADER_VALID|GRUB_GPT_PRIMARY_ENTRIES_VALID)
#define GRUB_GPT_BACKUP_VALID \
(GRUB_GPT_BACKUP_HEADER_VALID|GRUB_GPT_BACKUP_ENTRIES_VALID)
#define GRUB_GPT_BOTH_VALID (GRUB_GPT_PRIMARY_VALID|GRUB_GPT_BACKUP_VALID)
/* UEFI requires the entries table to be at least 16384 bytes for a
* total of 128 entries given the standard 128 byte entry size. */
#define GRUB_GPT_DEFAULT_ENTRIES_SIZE 16384
@ -197,6 +190,34 @@ struct grub_gpt
};
typedef struct grub_gpt *grub_gpt_t;
/* Helpers for checking the gpt status field. */
static inline int
grub_gpt_mbr_valid (grub_gpt_t gpt)
{
return ((gpt->status & GRUB_GPT_PROTECTIVE_MBR) ||
(gpt->status & GRUB_GPT_HYBRID_MBR));
}
static inline int
grub_gpt_primary_valid (grub_gpt_t gpt)
{
return ((gpt->status & GRUB_GPT_PRIMARY_HEADER_VALID) &&
(gpt->status & GRUB_GPT_PRIMARY_ENTRIES_VALID));
}
static inline int
grub_gpt_backup_valid (grub_gpt_t gpt)
{
return ((gpt->status & GRUB_GPT_BACKUP_HEADER_VALID) &&
(gpt->status & GRUB_GPT_BACKUP_ENTRIES_VALID));
}
static inline int
grub_gpt_both_valid (grub_gpt_t gpt)
{
return grub_gpt_primary_valid (gpt) && grub_gpt_backup_valid (gpt);
}
/* Translate GPT sectors to GRUB's 512 byte block addresses. */
static inline grub_disk_addr_t
grub_gpt_sector_to_addr (grub_gpt_t gpt, grub_uint64_t sector)