Validate size of EFI GUID partition entries.
Otherwise corrupted EFI partition tables can cause total confusion.
Signed-off-by: Timo Warns <warns@pre-sense.de>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
index ac0ccb5..19d6750 100644
--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -348,6 +348,12 @@
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");
+ goto fail;
+ }
+
if (!(*ptes = alloc_read_gpt_entries(state, *gpt)))
goto fail;