linux-kernel - [PATCH] [5/99] Fix for buffer overflow in ldm_frag

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Message-Id: <20110727214803.69CCD2403FF@tassilo.jf.intel.com>
Date:	Wed, 27 Jul 2011 14:48:03 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	Warns@...-sense.de, warns@...-sense.de,
	torvalds@...ux-foundation.org, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [5/99] Fix for buffer overflow in ldm_frag_add not sufficient

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Timo Warns <Warns@...-sense.de>

commit cae13fe4cc3f24820ffb990c09110626837e85d4 upstream.

As Ben Hutchings discovered [1], the patch for CVE-2011-1017 (buffer
overflow in ldm_frag_add) is not sufficient.  The original patch in
commit c340b1d64000 ("fs/partitions/ldm.c: fix oops caused by corrupted
partition table") does not consider that, for subsequent fragments,
previously allocated memory is used.

[1] http://lkml.org/lkml/2011/5/6/407

Reported-by: Ben Hutchings <ben@...adent.org.uk>
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>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/partitions/ldm.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6.35.y/fs/partitions/ldm.c
===================================================================
--- linux-2.6.35.y.orig/fs/partitions/ldm.c
+++ linux-2.6.35.y/fs/partitions/ldm.c
@@ -1335,6 +1335,11 @@ static bool ldm_frag_add (const u8 *data
 
 	list_add_tail (&f->list, frags);
 found:
+	if (rec >= f->num) {
+		ldm_error("REC value (%d) exceeds NUM value (%d)", rec, f->num);
+		return false;
+	}
+
 	if (f->map & (1 << rec)) {
 		ldm_error ("Duplicate VBLK, part %d.", rec);
 		f->map &= 0x7F;			/* Mark the group as broken */
--
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