When verifying GPT header integrity, make sure that
first usable LBA is smaller than last usable LBA.
Signed-off-by: Davidlohr Bueso <davidl...@hp.com>
---
block/partitions/efi.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/block/partitions/efi.c b/block/partitions/efi.c
index ab6cd08..9a81c3b 100644
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -409,7 +409,12 @@ 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");
--
1.7.11.7
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
