Commit 33afd7a7 authored Sep 11, 2013 by Davidlohr Bueso Committed by Linus Torvalds Sep 11, 2013

partitions/efi: check pmbr record's starting lba



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>

parent c2ebdc24

block/partitions/efi.c

+13 −4

Original line number	Diff line number	Diff line
		@@ -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;
		}

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