diff options
| author | Davidlohr Bueso <davidlohr@hp.com> | 2013-09-11 14:24:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:59:15 -0700 |
| commit | 33afd7a7df1a1f82675857a75572cdf4a8599e9f (patch) | |
| tree | 468b6d88bba5f2e517215f0da6f84d87a6f6814d /block | |
| parent | c2ebdc2439f50c049fd362bb225aaf78fe8e4cb8 (diff) | |
| download | lwn-33afd7a7df1a1f82675857a75572cdf4a8599e9f.tar.gz lwn-33afd7a7df1a1f82675857a75572cdf4a8599e9f.zip | |
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/partitions/efi.c | 17 |
1 files 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; } /** |