linux-kernel - [PATCH 3.2 142/149] cciss: fix info leak in cciss_ioctl32

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Message-ID: <lsq.1382345188.994552199@decadent.org.uk>
Date:	Mon, 21 Oct 2013 09:46:28 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Mike Miller" <mike.miller@...com>,
	"Dan Carpenter" <dan.carpenter@...cle.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: [PATCH 3.2 142/149] cciss: fix info leak in cciss_ioctl32_passthru()

3.2.52-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 58f09e00ae095e46ef9edfcf3a5fd9ccdfad065e upstream.

The arg64 struct has a hole after ->buf_size which isn't cleared.  Or if
any of the calls to copy_from_user() fail then that would cause an
information leak as well.

This was assigned CVE-2013-2147.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Mike Miller <mike.miller@...com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/block/cciss.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1186,6 +1186,7 @@ static int cciss_ioctl32_passthru(struct
 	int err;
 	u32 cp;
 
+	memset(&arg64, 0, sizeof(arg64));
 	err = 0;
 	err |=
 	    copy_from_user(&arg64.LUN_info, &arg32->LUN_info,

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