From patchwork Tue Jul 27 20:58:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 487300 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=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 DF1EEC00143 for ; Tue, 27 Jul 2021 21:36:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C510860FC0 for ; Tue, 27 Jul 2021 21:36:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232877AbhG0Vgy (ORCPT ); Tue, 27 Jul 2021 17:36:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232604AbhG0Vgw (ORCPT ); Tue, 27 Jul 2021 17:36:52 -0400 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B0BAFC061796 for ; Tue, 27 Jul 2021 14:36:51 -0700 (PDT) Received: by mail-pj1-x102f.google.com with SMTP id u9-20020a17090a1f09b029017554809f35so6735231pja.5 for ; Tue, 27 Jul 2021 14:36:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=4BnfRKheoEyJ1stoqG1udFT4VTgOpqL9vmyJJWgrwhQ=; b=NTFTSGnaaL1PjdfbInP9wW4+rEyfYbhJ/keeV1wnvEThtRN2gdcrpRCZ7hd1LSPL/w gpm7aIDUJ/FjLYIardaQXcuOjI/ZjGwWIdtBU8XtYG2CMUC8Us1z4TA/eJ27DZ+AF+dn 3omle6d7QFY3/lutHZTQhs0+KkQrfijMwyIfQ= 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=4BnfRKheoEyJ1stoqG1udFT4VTgOpqL9vmyJJWgrwhQ=; b=XdZdY3PdaVNyLH2BztKhKri52iPPuwfTMavQWZ7uQ5+z0/W6T7q9lZBXy47TFU9HKv QPEip/1i/Z/AtNQT80EphK5iaaqmZppZIaTPEaEq0ntaFo4GiMTYReqYBeJGu1F7DmsV rSfvPhDH7ssui8DXc9/V/y74Yt0c1/w3+2BBRja5QkIWa8DexzD9pKrf5U1LeJVHChds rf/iAZvOewcEB+RThAmpTF+Ic42seT3f+LPPat1R5y7ye4PC0C1lVLVHnen4iVOhGfTG euKUiPTFfDzkPMLKEYgE4bTZUdwGHNn+Wr37AbXRJhZKwNtstEp106Q4+5vRypQueOeL 3Lag== X-Gm-Message-State: AOAM5300I4J7eqzvL8+K9vvcHr0SmzvCv4xMYBhsbJrU+A+lniOfvnqf wTDeZ1sxvHup1da2PbmLmZGerQ== X-Google-Smtp-Source: ABdhPJywXHABddj5YKILKb1GKuMRYeJ3OumAxfDVgtAesPzGrRwd3W2ViDD691FQDqn6Bsbeqru0EA== X-Received: by 2002:a63:154d:: with SMTP id 13mr214806pgv.116.1627421811222; Tue, 27 Jul 2021 14:36:51 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id z9sm4890526pfa.2.2021.07.27.14.36.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:36:50 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com Subject: [PATCH 48/64] drbd: Use struct_group() to zero algs Date: Tue, 27 Jul 2021 13:58:39 -0700 Message-Id: <20210727205855.411487-49-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2322; h=from:subject; bh=1syui6IaJX/LeKhpA35yXKLKiDQJbdN3KjOA72sb0yw=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOL7jOa6t9HnTRkat/yBLQ7dAwkDK4D28V8dSKs BckHWDOJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBziwAKCRCJcvTf3G3AJjzYD/ 4zCOLV8aaPBAT/bUiOjvDCTgLgraBRaR3pGWcZHMGJANYM2EkJwwuDhYBGkXFsg/LT9+C0FBP8Y/Zc 5zPMr5Ck8KK1vkPuvxC1XxLeWJhbO7Z9IV0T96RT6vedIbwG/X0HJaMaOlT+1avad2HTRLXhAUzKf9 gxK4g4ZAvz/FXSOFqfOu4JDUZkbvgdqXKTRl1Ks3V/KGyA9ON1fkJKujv9YXdTGyFFudWFZewLc3BP DZPR81LSq8W/amm31XbR+stxT3RkRdzalx01+vXbX9LJoiC0gu7l/6U4b5J/VpCStcDJGVQl8FIhTi V+1401vurSluzntSGK22z+Cm1SERyXlJmS441MJeAecPsqSCnwghfDjdjciI3UKJWO/K9Qg++zKSTX Xg46C2C1CDENzVc/BEXLX4bRTM4AwyujZVJ2hRQ7bxl9SnluGtBytRpsMg8Msnryyvs3X8cmlQ9bUl XRrL69gqQC1H0bptqlRAOSNMxXAHdZVeI6VwFfJlkcw9nlt77JLmR4IN0CztbMsOydMgnp7kFIyOow V3/czlAK48y8FIgtBvWH5SaTNQHjO8KDpB/sU7DTiAlRVmRb+H9uM3KcdDUwf+cI08Yry5bLkSot5g ggAqgBoLiqeU0j1EpwD4W48NHRYgozq2B6FyI6ymPjBsMY1DKp1cRWhDZRww== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Add a struct_group() for the algs so that memset() can correctly reason about the size. Signed-off-by: Kees Cook --- drivers/block/drbd/drbd_main.c | 3 ++- drivers/block/drbd/drbd_protocol.h | 6 ++++-- drivers/block/drbd/drbd_receiver.c | 3 ++- 3 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 55234a558e98..b824679cfcb2 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -729,7 +729,8 @@ int drbd_send_sync_param(struct drbd_peer_device *peer_device) cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM; /* initialize verify_alg and csums_alg */ - memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); + BUILD_BUG_ON(sizeof(p->algs) != 2 * SHARED_SECRET_MAX); + memset(&p->algs, 0, sizeof(p->algs)); if (get_ldev(peer_device->device)) { dc = rcu_dereference(peer_device->device->ldev->disk_conf); diff --git a/drivers/block/drbd/drbd_protocol.h b/drivers/block/drbd/drbd_protocol.h index dea59c92ecc1..a882b65ab5d2 100644 --- a/drivers/block/drbd/drbd_protocol.h +++ b/drivers/block/drbd/drbd_protocol.h @@ -283,8 +283,10 @@ struct p_rs_param_89 { struct p_rs_param_95 { u32 resync_rate; - char verify_alg[SHARED_SECRET_MAX]; - char csums_alg[SHARED_SECRET_MAX]; + struct_group(algs, + char verify_alg[SHARED_SECRET_MAX]; + char csums_alg[SHARED_SECRET_MAX]; + ); u32 c_plan_ahead; u32 c_delay_target; u32 c_fill_target; diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 1f740e42e457..6df2539e215b 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -3921,7 +3921,8 @@ static int receive_SyncParam(struct drbd_connection *connection, struct packet_i /* initialize verify_alg and csums_alg */ p = pi->data; - memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); + BUILD_BUG_ON(sizeof(p->algs) != 2 * SHARED_SECRET_MAX); + memset(&p->algs, 0, sizeof(p->algs)); err = drbd_recv_all(peer_device->connection, p, header_size); if (err)