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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 D030BC433E3 for ; Tue, 16 Jun 2020 16:17:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B50342098B for ; Tue, 16 Jun 2020 16:17:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592324230; bh=RHVyUJryWVBrb37z8EtnL+5Xxwy5WhIbryfW9d+mlY4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hgkJbQ3GUqLxex3ALiXmFUAup/403tAUP3sETINxZqB3vq/o4GLSr3OMbShGV0l+y e/VRJF5ZKtwlBxwP5Kp8WVRrHbiIIMxlWUizeXXD8wjsGeMH1aXgPA+NhIolHDKQiC zrhb9afNsdFCAib5wjLilKkgZ6AdgojFN5rAgSo0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730963AbgFPPje (ORCPT ); Tue, 16 Jun 2020 11:39:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:52958 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730951AbgFPPja (ORCPT ); Tue, 16 Jun 2020 11:39:30 -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 6C3152145D; Tue, 16 Jun 2020 15:39:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592321970; bh=RHVyUJryWVBrb37z8EtnL+5Xxwy5WhIbryfW9d+mlY4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JNOD9wLMQhCPITDotwtwlcv+crJzmfaZvja50VnFYsweEx+bcu77AynJKLeqYcYsM 1pL4omj7p0E6RWTCRuo7bBQQY3hKR5c746K0Ie2fZC2bAsBjIyqpRmE9PvPnK3wcCB 0a31Xr0wmWE5H/GFgpbCKjb3bgJSktb/0dq94APw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, LABBE Corentin , Gonglei , Herbert Xu , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , virtualization@lists.linux-foundation.org, "Longpeng(Mike)" , Sasha Levin Subject: [PATCH 5.4 086/134] crypto: virtio: Fix use-after-free in virtio_crypto_skcipher_finalize_req() Date: Tue, 16 Jun 2020 17:34:30 +0200 Message-Id: <20200616153104.901978904@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200616153100.633279950@linuxfoundation.org> References: <20200616153100.633279950@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) [ Upstream commit 8c855f0720ff006d75d0a2512c7f6c4f60ff60ee ] The system'll crash when the users insmod crypto/tcrypto.ko with mode=155 ( testing "authenc(hmac(sha1),cbc(aes))" ). It's caused by reuse the memory of request structure. In crypto_authenc_init_tfm(), the reqsize is set to: [PART 1] sizeof(authenc_request_ctx) + [PART 2] ictx->reqoff + [PART 3] MAX(ahash part, skcipher part) and the 'PART 3' is used by both ahash and skcipher in turn. When the virtio_crypto driver finish skcipher req, it'll call ->complete callback(in crypto_finalize_skcipher_request) and then free its resources whose pointers are recorded in 'skcipher parts'. However, the ->complete is 'crypto_authenc_encrypt_done' in this case, it will use the 'ahash part' of the request and change its content, so virtio_crypto driver will get the wrong pointer after ->complete finish and mistakenly free some other's memory. So the system will crash when these memory will be used again. The resources which need to be cleaned up are not used any more. But the pointers of these resources may be changed in the function "crypto_finalize_skcipher_request". Thus release specific resources before calling this function. Fixes: dbaf0624ffa5 ("crypto: add virtio-crypto driver") Reported-by: LABBE Corentin 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 Link: https://lore.kernel.org/r/20200123101000.GB24255@Red Acked-by: Gonglei Signed-off-by: Longpeng(Mike) Link: https://lore.kernel.org/r/20200602070501.2023-3-longpeng2@huawei.com Signed-off-by: Michael S. Tsirkin Signed-off-by: Sasha Levin --- drivers/crypto/virtio/virtio_crypto_algs.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c b/drivers/crypto/virtio/virtio_crypto_algs.c index 82b316b2f537..fea55b5da8b5 100644 --- a/drivers/crypto/virtio/virtio_crypto_algs.c +++ b/drivers/crypto/virtio/virtio_crypto_algs.c @@ -580,10 +580,11 @@ static void virtio_crypto_ablkcipher_finalize_req( scatterwalk_map_and_copy(req->info, req->dst, req->nbytes - AES_BLOCK_SIZE, AES_BLOCK_SIZE, 0); - crypto_finalize_ablkcipher_request(vc_sym_req->base.dataq->engine, - req, err); kzfree(vc_sym_req->iv); virtcrypto_clear_request(&vc_sym_req->base); + + crypto_finalize_ablkcipher_request(vc_sym_req->base.dataq->engine, + req, err); } static struct virtio_crypto_algo virtio_crypto_algs[] = { { -- 2.25.1