Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751858AbZJWKg5 (ORCPT ); Fri, 23 Oct 2009 06:36:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751510AbZJWKg4 (ORCPT ); Fri, 23 Oct 2009 06:36:56 -0400 Received: from mx1.redhat.com ([209.132.183.28]:29398 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751222AbZJWKgz (ORCPT ); Fri, 23 Oct 2009 06:36:55 -0400 From: Karel Zak To: Andries Brouwer , Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Karel Zak Subject: [PATCH 2/2] partitions: read whole sector with EFI GPT header Date: Fri, 23 Oct 2009 12:36:16 +0200 Message-Id: <1256294176-32113-2-git-send-email-kzak@redhat.com> In-Reply-To: <1256294176-32113-1-git-send-email-kzak@redhat.com> References: <1256294176-32113-1-git-send-email-kzak@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2418 Lines: 76 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 --- fs/partitions/efi.c | 7 ++++--- fs/partitions/efi.h | 8 ++++++-- 2 files changed, 10 insertions(+), 5 deletions(-) diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c index da3f576..58eca76 100644 --- a/fs/partitions/efi.c +++ b/fs/partitions/efi.c @@ -260,15 +260,16 @@ 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; diff --git a/fs/partitions/efi.h b/fs/partitions/efi.h index 2cc89d0..6998b58 100644 --- a/fs/partitions/efi.h +++ b/fs/partitions/efi.h @@ -37,7 +37,6 @@ #define EFI_PMBR_OSTYPE_EFI 0xEF #define EFI_PMBR_OSTYPE_EFI_GPT 0xEE -#define GPT_BLOCK_SIZE 512 #define GPT_HEADER_SIGNATURE 0x5452415020494645ULL #define GPT_HEADER_REVISION_V1 0x00010000 #define GPT_PRIMARY_PARTITION_TABLE_LBA 1 @@ -79,7 +78,12 @@ typedef struct _gpt_header { __le32 num_partition_entries; __le32 sizeof_partition_entry; __le32 partition_entry_array_crc32; - u8 reserved2[GPT_BLOCK_SIZE - 92]; + + /* The rest of the logical block is reserved by UEFI and must be zero. + * EFI standard handles this by: + * + * uint8_t reserved2[ BlockSize - 92 ]; + */ } __attribute__ ((packed)) gpt_header; typedef struct _gpt_entry_attributes { -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/