From patchwork Tue Jun 2 07:05:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Longpeng\(Mike\)" X-Patchwork-Id: 197687 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, 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 1894DC433DF for ; Tue, 2 Jun 2020 07:05:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 03E8120738 for ; Tue, 2 Jun 2020 07:05:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726239AbgFBHFc (ORCPT ); Tue, 2 Jun 2020 03:05:32 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:5330 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726472AbgFBHF2 (ORCPT ); Tue, 2 Jun 2020 03:05:28 -0400 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 44A5D1D4FF79B3E0B03A; Tue, 2 Jun 2020 15:05:23 +0800 (CST) Received: from DESKTOP-27KDQMV.china.huawei.com (10.174.151.115) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.487.0; Tue, 2 Jun 2020 15:05:13 +0800 From: "Longpeng(Mike)" To: CC: "Longpeng(Mike)" , Gonglei , Herbert Xu , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , , , Subject: [PATCH v3 3/3] crypto: virtio: Fix dest length calculation in __virtio_crypto_skcipher_do_req() Date: Tue, 2 Jun 2020 15:05:01 +0800 Message-ID: <20200602070501.2023-4-longpeng2@huawei.com> X-Mailer: git-send-email 2.25.0.windows.1 In-Reply-To: <20200602070501.2023-1-longpeng2@huawei.com> References: <20200602070501.2023-1-longpeng2@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.151.115] X-CFilter-Loop: Reflected Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org The src/dst length is not aligned with AES_BLOCK_SIZE(which is 16) in some testcases in tcrypto.ko. For example, the src/dst length of one of cts(cbc(aes))'s testcase is 17, the crypto_virtio driver will set @src_data_len=16 but @dst_data_len=17 in this case and get a wrong at then end. SRC: pp pp pp pp pp pp pp pp pp pp pp pp pp pp pp pp pp (17 bytes) EXP: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc pp (17 bytes) DST: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 00 (pollute the last bytes) (pp: plaintext cc:ciphertext) Fix this issue by limit the length of dest buffer. Fixes: dbaf0624ffa5 ("crypto: add virtio-crypto driver") Cc: Gonglei 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 Signed-off-by: Longpeng(Mike) --- drivers/crypto/virtio/virtio_crypto_algs.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c b/drivers/crypto/virtio/virtio_crypto_algs.c index 52261b6..cb8a6ea 100644 --- a/drivers/crypto/virtio/virtio_crypto_algs.c +++ b/drivers/crypto/virtio/virtio_crypto_algs.c @@ -407,6 +407,7 @@ static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm, goto free; } + dst_len = min_t(unsigned int, req->cryptlen, dst_len); pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n", req->cryptlen, dst_len);