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 X-Spam-Level: X-Spam-Status: No, score=-12.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25A28C4742C for ; Mon, 2 Nov 2020 16:15:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DF66722268 for ; Mon, 2 Nov 2020 16:14:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=arista.com header.i=@arista.com header.b="XQa4ZCTJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727034AbgKBQO6 (ORCPT ); Mon, 2 Nov 2020 11:14:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726734AbgKBQOx (ORCPT ); Mon, 2 Nov 2020 11:14:53 -0500 Received: from mail-wr1-x442.google.com (mail-wr1-x442.google.com [IPv6:2a00:1450:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6649AC061A04 for ; Mon, 2 Nov 2020 08:14:52 -0800 (PST) Received: by mail-wr1-x442.google.com with SMTP id n18so15269422wrs.5 for ; Mon, 02 Nov 2020 08:14:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=googlenew; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Z6618xJXhXqXHodxwmKYhO6tkPP3WPr6UxJwjTPsCDQ=; b=XQa4ZCTJc70MalCEMRbstL9yhQ4aW+Muw9kK/V815HmkgCapYFtoyDWH+xFMOxXqEy J/CNvNCaQJd/n9/rWezWyW2+FWtl00gTQTyM3cfj/AMrnGmFUvVghNMV0zBZqftPDYm9 it8r9jiiVUoJEPLFgdsnIn0s9JFsGJ2nnJnAlvum6wVD/sp95K3XDHvIldVqeXnXGI6n bsruMepaFNrqeqvpOCCMUIoyNx/Vp61vhMXhZNSIJhDzFk/AVse7Z1Z8Xk+licP2bPTn XdKSMzWCaHyTYfCrHREhRCF7PlP9/EUup2yCefARbeot8neoBX55alipTDWy7dhuPLf7 3VJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Z6618xJXhXqXHodxwmKYhO6tkPP3WPr6UxJwjTPsCDQ=; b=L2ydI/7rGy0W04p6ZuQ5PbvV7Qyg70B6lkrITRDfyZ0NXWE1YaTeuMuhkjz5q9YsC3 2JoEih+33CzkMnROmgXaPwgaBPXhLKz41Fk1Fd0DPk+fIv30/9kb8Xl84fBGJjmEpZp/ 03nevVXBVQq6Gh0B4i2D/+Qa9YyAd1hCCIoMFxWnp1anbdSkMFozYD0DLzgcS3yVjBmF p9OgYsjPx7EpPjazei/D/RiwM0XcNdy1jBn/iKta0k0hSkHWF2FlI1r65hnjXEsRAJPK y26p7BnRnpZcDn7oefLqb8WZrkGLGe7FFJoKoa0dni4jn36m+bbzTi7pql8qteJB04gP ta/w== X-Gm-Message-State: AOAM532QvBXFDfrp5E6WOddi7aM4wJFerFZHoI3XVAI+86TeqSw5rJC1 bKTGpHivkT0gUfT6erJcpsQ7dQcYZ8oPyH4S X-Google-Smtp-Source: ABdhPJyx8kw0GtHnHiZVHl/JP/ocb946aS8LqaiSCCdAWExQH/L/4D4M3A9HeSVnpR5lCk8w6YgceA== X-Received: by 2002:adf:bd86:: with SMTP id l6mr21763532wrh.205.1604333690852; Mon, 02 Nov 2020 08:14:50 -0800 (PST) Received: from localhost.localdomain ([2a02:8084:e84:2480:228:f8ff:fe6f:83a8]) by smtp.gmail.com with ESMTPSA id x18sm24127878wrg.4.2020.11.02.08.14.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2020 08:14:50 -0800 (PST) From: Dmitry Safonov To: linux-kernel@vger.kernel.org Cc: Dmitry Safonov <0x7f454c46@gmail.com>, Dmitry Safonov , Steffen Klassert , "David S. Miller" , Jakub Kicinski , Herbert Xu , Hillf Danton , netdev@vger.kernel.org, syzbot+a7e701c8385bd8543074@syzkaller.appspotmail.com Subject: [PATCH v2 1/3] xfrm/compat: Translate by copying XFRMA_UNSPEC attribute Date: Mon, 2 Nov 2020 16:14:45 +0000 Message-Id: <20201102161447.1266001-2-dima@arista.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201102161447.1266001-1-dima@arista.com> References: <20201102161447.1266001-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org xfrm_xlate32() translates 64-bit message provided by kernel to be sent for 32-bit listener (acknowledge or monitor). Translator code doesn't expect XFRMA_UNSPEC attribute as it doesn't know its payload. Kernel never attaches such attribute, but a user can. I've searched if any opensource does it and the answer is no. Nothing on github and google finds only tfcproject that has such code commented-out. What will happen if a user sends a netlink message with XFRMA_UNSPEC attribute? Ipsec code ignores this attribute. But if there is a monitor-process or 32-bit user requested ack - kernel will try to translate such message and will hit WARN_ONCE() in xfrm_xlate64_attr(). Deal with XFRMA_UNSPEC by copying the attribute payload with xfrm_nla_cpy(). In result, the default switch-case in xfrm_xlate64_attr() becomes an unused code. Leave those 3 lines in case a new xfrm attribute will be added. Fixes: 5461fc0c8d9f ("xfrm/compat: Add 64=>32-bit messages translator") Reported-by: syzbot+a7e701c8385bd8543074@syzkaller.appspotmail.com Signed-off-by: Dmitry Safonov --- net/xfrm/xfrm_compat.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/xfrm/xfrm_compat.c b/net/xfrm/xfrm_compat.c index e28f0c9ecd6a..17edbf935e35 100644 --- a/net/xfrm/xfrm_compat.c +++ b/net/xfrm/xfrm_compat.c @@ -234,6 +234,7 @@ static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src) case XFRMA_PAD: /* Ignore */ return 0; + case XFRMA_UNSPEC: case XFRMA_ALG_AUTH: case XFRMA_ALG_CRYPT: case XFRMA_ALG_COMP: -- 2.28.0