From patchwork Tue Sep 1 15:10:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 310346 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=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 2EFF4C433E2 for ; Tue, 1 Sep 2020 16:16:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 04006207D3 for ; Tue, 1 Sep 2020 16:16:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598977013; bh=NkA8PEf4GzDYWrPWLhgilQx3bxTCKVY7CDrjO5GtJRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JSj1ETtY6554FVux9tE1tEX3KXxLFeipJ/lvjBeMnoW5Y7xCPWHfyBBG8OnbqxSst B4Y9D4m+m1JFCrt0jzI42DYjvGcTEB/9u6Sl89yzQjtZtQ6q7n4lXK8DIMFRNF8ASz JfzCHoiF64IpPXaWmRQ/e2fri4787Us3ZuAxiyR4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730557AbgIAPeI (ORCPT ); Tue, 1 Sep 2020 11:34:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:38742 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730713AbgIAPeF (ORCPT ); Tue, 1 Sep 2020 11:34:05 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1095C21582; Tue, 1 Sep 2020 15:34:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598974444; bh=NkA8PEf4GzDYWrPWLhgilQx3bxTCKVY7CDrjO5GtJRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0a1L+vjszs6/LFnFDkbp1sspCXZiwxSMrYrAI8iJhq+gBzRrprAaCi8sI7GOAvkpn qPyv4kh7b5ZV7TWAHwwhMO5TFLewQAg/HgJfx+h4Rm8zinC6Hx/KvOcQLvPGLvBHm1 J9jW/hqReyrS1OEd1zWoSWCDXBA4QJDIuIC1sk4Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Caleb Jorden , Herbert Xu Subject: [PATCH 5.4 178/214] crypto: af_alg - Work around empty control messages without MSG_MORE Date: Tue, 1 Sep 2020 17:10:58 +0200 Message-Id: <20200901151001.502942541@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150952.963606936@linuxfoundation.org> References: <20200901150952.963606936@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Herbert Xu commit c195d66a8a75c60515819b101975f38b7ec6577f upstream. The iwd daemon uses libell which sets up the skcipher operation with two separate control messages. As the first control message is sent without MSG_MORE, it is interpreted as an empty request. While libell should be fixed to use MSG_MORE where appropriate, this patch works around the bug in the kernel so that existing binaries continue to work. We will print a warning however. A separate issue is that the new kernel code no longer allows the control message to be sent twice within the same request. This restriction is obviously incompatible with what iwd was doing (first setting an IV and then sending the real control message). This patch changes the kernel so that this is explicitly allowed. Reported-by: Caleb Jorden Fixes: f3c802a1f300 ("crypto: algif_aead - Only wake up when...") Cc: Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- crypto/af_alg.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -847,9 +848,15 @@ int af_alg_sendmsg(struct socket *sock, } lock_sock(sk); - if (ctx->init && (init || !ctx->more)) { - err = -EINVAL; - goto unlock; + if (ctx->init && !ctx->more) { + if (ctx->used) { + err = -EINVAL; + goto unlock; + } + + pr_info_once( + "%s sent an empty control message without MSG_MORE.\n", + current->comm); } ctx->init = true;