From 33afd7a7df1a1f82675857a75572cdf4a8599e9f Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Wed, 11 Sep 2013 14:24:56 -0700 Subject: [PATCH] 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 Reviewed-by: Karel Zak Acked-by: Matt Fleming Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- block/partitions/efi.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/block/partitions/efi.c b/block/partitions/efi.c index bd8fb22b2109..7a2b74f0d06f 100644 --- a/block/partitions/efi.c +++ b/block/partitions/efi.c @@ -151,10 +151,19 @@ 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) - return 1; - return 0; + 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; } /** -- 2.20.1