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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 704D7C433E2 for ; Tue, 16 Jun 2020 15:47:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 53D8C214DB for ; Tue, 16 Jun 2020 15:47:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592322429; bh=ZCiPAtOxuxnCByGA3BqQ7UHBlJxuFSZWp1aLpHrCBmI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=klsEiw+t2pNl1YwDErQjO4Se5VIqbay3wZYYxNEoHmXUY5VsE5jgk/MtkLxdfLkOm HdlrrF1cgNZFj51uACcIiEcUEWgaD1q1wTsIvwB/0f0MHA3cDCIQMPrmhBe6ve+5Ut mEQnm+lmsgPTH2Qyf6Q14tqSsKTreHl35VkRJaJE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732285AbgFPPrH (ORCPT ); Tue, 16 Jun 2020 11:47:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:39772 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732277AbgFPPrD (ORCPT ); Tue, 16 Jun 2020 11:47:03 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 3E13F21475; Tue, 16 Jun 2020 15:47:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592322422; bh=ZCiPAtOxuxnCByGA3BqQ7UHBlJxuFSZWp1aLpHrCBmI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cYyy372Ap0zMk5I+QzJeq1EIWR6OaQ0jhfBFMe4Jv1pIIwqW22Ssg0777K0sO4/zX 4sOibt9ntWduVdx7CQ52kA88QxBrrFmYDut5UDNHyE1Gn5GTGhbhWJoaxhdJZLqq6C XwLehHOh13F0Wpoj+gpTYuE14mJrSJHyVL/hHwyk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, LABBE Corentin , Herbert Xu , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , virtualization@lists.linux-foundation.org, Gonglei , "Longpeng(Mike)" Subject: [PATCH 5.7 095/163] crypto: virtio: Fix src/dst scatterlist calculation in __virtio_crypto_skcipher_do_req() Date: Tue, 16 Jun 2020 17:34:29 +0200 Message-Id: <20200616153111.382472195@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200616153106.849127260@linuxfoundation.org> References: <20200616153106.849127260@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Longpeng(Mike) commit b02989f37fc5e865ceeee9070907e4493b3a21e2 upstream. The system will crash when the users insmod crypto/tcrypt.ko with mode=38 ( testing "cts(cbc(aes))" ). Usually the next entry of one sg will be @sg@ + 1, but if this sg element is part of a chained scatterlist, it could jump to the start of a new scatterlist array. Fix it by sg_next() on calculation of src/dst scatterlist. Fixes: dbaf0624ffa5 ("crypto: add virtio-crypto driver") Reported-by: LABBE Corentin Cc: Herbert Xu Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: "David S. Miller" Cc: virtualization@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200123101000.GB24255@Red Signed-off-by: Gonglei Signed-off-by: Longpeng(Mike) Link: https://lore.kernel.org/r/20200602070501.2023-2-longpeng2@huawei.com Signed-off-by: Michael S. Tsirkin Signed-off-by: Greg Kroah-Hartman --- drivers/crypto/virtio/virtio_crypto_algs.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) --- a/drivers/crypto/virtio/virtio_crypto_algs.c +++ b/drivers/crypto/virtio/virtio_crypto_algs.c @@ -350,13 +350,18 @@ __virtio_crypto_skcipher_do_req(struct v int err; unsigned long flags; struct scatterlist outhdr, iv_sg, status_sg, **sgs; - int i; u64 dst_len; unsigned int num_out = 0, num_in = 0; int sg_total; uint8_t *iv; + struct scatterlist *sg; src_nents = sg_nents_for_len(req->src, req->cryptlen); + if (src_nents < 0) { + pr_err("Invalid number of src SG.\n"); + return src_nents; + } + dst_nents = sg_nents(req->dst); pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n", @@ -443,12 +448,12 @@ __virtio_crypto_skcipher_do_req(struct v vc_sym_req->iv = iv; /* Source data */ - for (i = 0; i < src_nents; i++) - sgs[num_out++] = &req->src[i]; + for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--) + sgs[num_out++] = sg; /* Destination data */ - for (i = 0; i < dst_nents; i++) - sgs[num_out + num_in++] = &req->dst[i]; + for (sg = req->dst; sg; sg = sg_next(sg)) + sgs[num_out + num_in++] = sg; /* Status */ sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status));