linux-kernel - [PATCH 19/91] Validate size of EFI GUID partition entries.

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Message-Id: <20120205220950.259230674@pcw.home.local>
Date:	Sun, 05 Feb 2012 23:10:08 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Timo Warns <warns@...-sense.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 19/91] Validate size of EFI GUID partition entries.

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

------------------

commit fa039d5f6b126fbd65eefa05db2f67e44df8f121 upstream.

Otherwise corrupted EFI partition tables can cause total confusion.

Signed-off-by: Timo Warns <warns@...-sense.de>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 fs/partitions/efi.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

Index: longterm-2.6.27/fs/partitions/efi.c
===================================================================
--- longterm-2.6.27.orig/fs/partitions/efi.c	2012-02-05 22:34:34.453915054 +0100
+++ longterm-2.6.27/fs/partitions/efi.c	2012-02-05 22:34:37.590915121 +0100
@@ -343,6 +343,12 @@
 		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(bdev, *gpt)))
 		goto fail;
 


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