[02/24] Validate size of EFI GUID partition entries.

From: Greg KH
Date: Thu May 19 2011 - 14:32:29 EST


2.6.33-longterm review patch. If anyone has any objections, please let us know.

------------------
Content-Length: 822
Lines: 30

From: Timo Warns <Warns@xxxxxxxxxxxx>

commit fa039d5f6b126fbd65eefa05db2f67e44df8f121 upstream.

Otherwise corrupted EFI partition tables can cause total confusion.

Signed-off-by: Timo Warns <warns@xxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
fs/partitions/efi.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -349,6 +349,12 @@ is_gpt_valid(struct block_device *bdev,
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(bdev, *gpt)))
goto fail;



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