Commit aa054bc9 authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Linus Torvalds
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partitions/efi: compare first and last usable LBAs 



When verifying GPT header integrity, make sure that first usable LBA is
smaller than last usable LBA.

Signed-off-by: default avatarDavidlohr Bueso <davidlohr@hp.com>
Reviewed-by: default avatarKarel Zak <kzak@redhat.com>
Acked-by: default avatarMatt Fleming <matt.fleming@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 27a7c642

block/partitions/efi.c

+6 −1
Original line number Diff line number Diff line
@@ -410,7 +410,12 @@ static int is_gpt_valid(struct parsed_partitions *state, u64 lba, 
			 (unsigned long long)lastlba);

		goto fail;

	}



	if (le64_to_cpu((*gpt)->last_usable_lba) < le64_to_cpu((*gpt)->first_usable_lba)) {

		pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",

			 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),

			 (unsigned long long)le64_to_cpu((*gpt)->first_usable_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");