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| author | Davidlohr Bueso <davidlohr@hp.com> | 2013-09-11 14:25:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:59:18 -0700 |
| commit | aa054bc93743ecce3a27f1655d59674dabc71a54 (patch) | |
| tree | ef4a3d6042ce1ae5554cea6c29e2aca6c230f5dd /block | |
| parent | 27a7c642174eaec627f6a3a254035bf8abd02c5e (diff) | |
| download | lwn-aa054bc93743ecce3a27f1655d59674dabc71a54.tar.gz lwn-aa054bc93743ecce3a27f1655d59674dabc71a54.zip | |
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: Davidlohr Bueso <davidlohr@hp.com>
Reviewed-by: Karel Zak <kzak@redhat.com>
Acked-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/partitions/efi.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/block/partitions/efi.c b/block/partitions/efi.c index b028af688361..de9f9bfa24bc 100644 --- a/block/partitions/efi.c +++ b/block/partitions/efi.c @@ -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"); |