From 46d9108009ccb9ac567cc285a15efb05864932d5 Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Tue, 11 Sep 2012 19:22:32 +0200 Subject: [PATCH 21/89] gpt: require first_usable_LBA <= last_usable_LBA When verifying GPT header integrity, ensure that the first usable LBA is no larger than the last usable LBA. * libparted/labels/gpt.c (_header_is_valid): Reject a header with last_usable < first_usable. --- libparted/labels/gpt.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libparted/labels/gpt.c b/libparted/labels/gpt.c index 6032e3f..83e518f 100644 --- a/libparted/labels/gpt.c +++ b/libparted/labels/gpt.c @@ -653,6 +653,10 @@ _header_is_valid (PedDisk const *disk, GuidPartitionTableHeader_t *gpt, if (first_usable < 3) return 0; + PedSector last_usable = PED_LE64_TO_CPU (gpt->LastUsableLBA); + if (last_usable < first_usable) + return 0; + origcrc = gpt->HeaderCRC32; gpt->HeaderCRC32 = 0; if (pth_crc32 (dev, gpt, &crc) != 0) -- 1.8.5.3