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authorKarel Zak <kzak@redhat.com>2009-11-23 09:29:58 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-11-23 09:29:58 +0100
commit87038c2d5bda2418fda8b1456a0ae81cc3ff5bd8 (patch)
tree13a2250971f1309faae76ff2bbebda058ca99b32 /fs/partitions/efi.c
parent7d13af3279985f554784a45cc961f706dbcdbdd1 (diff)
partitions: read whole sector with EFI GPT header
The size of EFI GPT header is not static, but whole sector is allocated for the header. The HeaderSize field must be greater than 92 (= sizeof(struct gpt_header) and must be less than or equal to the logical block size. It means we have to read whole sector with the header, because the header crc32 checksum is calculated according to HeaderSize. For more details see UEFI standard (version 2.3, May 2009): - 5.3.1 GUID Format overview, page 93 - Table 13. GUID Partition Table Header, page 96 Signed-off-by: Karel Zak <kzak@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'fs/partitions/efi.c')
-rw-r--r--fs/partitions/efi.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
index 80eeff5fdfe0..49cfd5f54238 100644
--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -262,15 +262,16 @@ static gpt_header *
alloc_read_gpt_header(struct block_device *bdev, u64 lba)
{
gpt_header *gpt;
+ unsigned ssz = bdev_logical_block_size(bdev);
+
if (!bdev)
return NULL;
- gpt = kzalloc(sizeof (gpt_header), GFP_KERNEL);
+ gpt = kzalloc(ssz, GFP_KERNEL);
if (!gpt)
return NULL;
- if (read_lba(bdev, lba, (u8 *) gpt,
- sizeof (gpt_header)) < sizeof (gpt_header)) {
+ if (read_lba(bdev, lba, (u8 *) gpt, ssz) < ssz) {
kfree(gpt);
gpt=NULL;
return NULL;