Messages in this thread Patch in this message | | | Subject | [PATCH 1/3] partitions: efi: compare first and last usable LBAs | From | Davidlohr Bueso <> | Date | Wed, 05 Sep 2012 11:18:23 +0200 |
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When verifying GPT header integrity, make sure that first usable LBA is smaller than last usable LBA.
Signed-off-by: Davidlohr Bueso <dave@gnu.org> --- block/partitions/efi.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/block/partitions/efi.c b/block/partitions/efi.c index 6296b40..7795bb4 100644 --- a/block/partitions/efi.c +++ b/block/partitions/efi.c @@ -344,6 +344,12 @@ static int is_gpt_valid(struct parsed_partitions *state, u64 lba, * within the disk. */ lastlba = last_lba(state->bdev); + 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; + } if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) { pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n", (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba), -- 1.7.4.1
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