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partitions/efi: check pmbr record's starting lba

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Per the UEFI Specs 2.4, June 2013, the starting lba of the partition that
has the EFI GPT (0xEE) must be set to 0x00000001 - this is obviously the
LBA of the GPT Partition Header.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Reviewed-by: Karel Zak <kzak@redhat.com>
Acked-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davidlohr Bueso 2013-09-11 14:24:56 -07:00 committed by Linus Torvalds
parent c2ebdc2439
commit 33afd7a7df
1 changed files with 13 additions and 4 deletions
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13
block/partitions/efi.c
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@ -151,9 +151,18 @@ static u64 last_lba(struct block_device *bdev)
static inline int pmbr_part_valid(gpt_mbr_record *part)
{
if (part->os_type == EFI_PMBR_OSTYPE_EFI_GPT &&
le32_to_cpu(part->start_sector) == 1UL)
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;
if (le32_to_cpu(part->start_sector) != 1UL)
goto invalid;
return 1;
invalid:
return 0;
}