Return-Path: Message-Id: <20130604172133.829088753@1wt.eu> Date: Tue, 04 Jun 2013 19:22:55 +0200 From: Willy Tarreau To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mathias Krause , Steffen Klassert , "David S. Miller" , Greg Kroah-Hartman , Willy Tarreau Subject: [ 085/184] xfrm_user: fix info leak in copy_to_user_policy() In-Reply-To: <58df134a4b98edf5b0073e2e1e988fe6@local> Sender: linux-kernel-owner@vger.kernel.org List-ID: 2.6.32-longterm 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 Signed-off-by: Willy Tarreau --- net/xfrm/xfrm_user.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 4823a15..3de81fe 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1076,6 +1076,7 @@ static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy 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)); -- 1.7.12.2.21.g234cd45.dirty