From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933863Ab2JKBTK (ORCPT ); Wed, 10 Oct 2012 21:19:10 -0400 Received: from out1-smtp.messagingengine.com ([66.111.4.25]:43629 "EHLO out1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933843Ab2JKBTD (ORCPT ); Wed, 10 Oct 2012 21:19:03 -0400 X-Sasl-enc: Td8Vww4ZNWQUsU+IQFeca5mqfLagWTcSJGHTuMECj1vn 1349918342 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Mathias Krause , Steffen Klassert , "David S. Miller" Subject: [ 029/120] xfrm_user: fix info leak in copy_to_user_policy() Date: Thu, 11 Oct 2012 09:59:41 +0900 Message-Id: <20121011005830.884258457@linuxfoundation.org> X-Mailer: git-send-email 1.8.0.rc0.18.gf84667d In-Reply-To: <20121011005825.364610894@linuxfoundation.org> References: <20121011005825.364610894@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Krause [ Upstream commit 7b789836f434c87168eab067cfbed1ec4783dffd ] The memory reserved to dump the xfrm policy includes multiple padding bytes added by the compiler for alignment (padding bytes in struct xfrm_selector and struct xfrm_userpolicy_info). Add an explicit memset(0) before filling the buffer to avoid the heap info leak. Signed-off-by: Mathias Krause Acked-by: Steffen Klassert Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/xfrm/xfrm_user.c | 1 + 1 file changed, 1 insertion(+) --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1300,6 +1300,7 @@ static void copy_from_user_policy(struct static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) { + memset(p, 0, sizeof(*p)); memcpy(&p->sel, &xp->selector, sizeof(p->sel)); memcpy(&p->lft, &xp->lft, sizeof(p->lft)); memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));