From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66AABC433EF for ; Mon, 7 Mar 2022 09:24:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233182AbiCGJZc (ORCPT ); Mon, 7 Mar 2022 04:25:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237059AbiCGJXW (ORCPT ); Mon, 7 Mar 2022 04:23:22 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5325C6662A; Mon, 7 Mar 2022 01:21:46 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id F080FB810C0; Mon, 7 Mar 2022 09:21:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6482AC340F6; Mon, 7 Mar 2022 09:21:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1646644903; bh=zu22j3tHmE8fVI+T7JaCdg1E5egrF7AQyc/FiqQy8Qg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SSPn1nOc4013KRM2/+xI7OyHDS0DAMb2A8iZlf3wAo/M+ZtiJMfhrXdSYHAW833dg FczabSDWvFVyS7a4ngHrUiEh3l87zI6lKXDj3xpQdgWGTEFOOjQv6EaHlWzwDlGRb4 cSCrDBSiK7WfkTxy8jQOtaw7UuZUnLuGFt+HclX0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Leon Romanovsky , Steffen Klassert Subject: [PATCH 4.14 17/42] xfrm: enforce validity of offload input flags Date: Mon, 7 Mar 2022 10:18:51 +0100 Message-Id: <20220307091636.652610016@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220307091636.146155347@linuxfoundation.org> References: <20220307091636.146155347@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Leon Romanovsky commit 7c76ecd9c99b6e9a771d813ab1aa7fa428b3ade1 upstream. struct xfrm_user_offload has flags variable that received user input, but kernel didn't check if valid bits were provided. It caused a situation where not sanitized input was forwarded directly to the drivers. For example, XFRM_OFFLOAD_IPV6 define that was exposed, was used by strongswan, but not implemented in the kernel at all. As a solution, check and sanitize input flags to forward XFRM_OFFLOAD_INBOUND to the drivers. Fixes: d77e38e612a0 ("xfrm: Add an IPsec hardware offloading API") Signed-off-by: Leon Romanovsky Signed-off-by: Steffen Klassert Signed-off-by: Greg Kroah-Hartman --- include/uapi/linux/xfrm.h | 6 ++++++ net/xfrm/xfrm_device.c | 6 +++++- 2 files changed, 11 insertions(+), 1 deletion(-) --- a/include/uapi/linux/xfrm.h +++ b/include/uapi/linux/xfrm.h @@ -501,6 +501,12 @@ struct xfrm_user_offload { int ifindex; __u8 flags; }; +/* This flag was exposed without any kernel code that supporting it. + * Unfortunately, strongswan has the code that uses sets this flag, + * which makes impossible to reuse this bit. + * + * So leave it here to make sure that it won't be reused by mistake. + */ #define XFRM_OFFLOAD_IPV6 1 #define XFRM_OFFLOAD_INBOUND 2 --- a/net/xfrm/xfrm_device.c +++ b/net/xfrm/xfrm_device.c @@ -69,6 +69,9 @@ int xfrm_dev_state_add(struct net *net, if (x->encap || x->tfcpad || (x->props.flags & XFRM_STATE_ESN)) return 0; + if (xuo->flags & ~(XFRM_OFFLOAD_IPV6 | XFRM_OFFLOAD_INBOUND)) + return -EINVAL; + dev = dev_get_by_index(net, xuo->ifindex); if (!dev) { if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) { @@ -98,7 +101,8 @@ int xfrm_dev_state_add(struct net *net, xso->dev = dev; xso->num_exthdrs = 1; - xso->flags = xuo->flags; + /* Don't forward bit that is not implemented */ + xso->flags = xuo->flags & ~XFRM_OFFLOAD_IPV6; err = dev->xfrmdev_ops->xdo_dev_state_add(x); if (err) {