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    Subject[34-longterm 172/196] Validate size of EFI GUID partition entries.
    Date
    From: Timo Warns <Warns@pre-sense.de>

    -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
    -------------------

    commit fa039d5f6b126fbd65eefa05db2f67e44df8f121 upstream.

    Otherwise corrupted EFI partition tables can cause total confusion.

    Signed-off-by: Timo Warns <warns@pre-sense.de>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    fs/partitions/efi.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
    index 91babda..ee59684 100644
    --- a/fs/partitions/efi.c
    +++ b/fs/partitions/efi.c
    @@ -350,6 +350,12 @@ is_gpt_valid(struct block_device *bdev, u64 lba,
    goto fail;
    }

    + /* Check that sizeof_partition_entry has the correct value */
    + if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) {
    + pr_debug("GUID Partitition Entry Size check failed.\n");
    + goto fail;
    + }
    +
    if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt)))
    goto fail;

    --
    1.7.9.3


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