From patchwork Wed Aug 18 06:05:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 12443247 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=-19.4 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=ham 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 C5663C432BE for ; Wed, 18 Aug 2021 06:24:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A8F6C610A6 for ; Wed, 18 Aug 2021 06:24:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238543AbhHRGYs (ORCPT ); Wed, 18 Aug 2021 02:24:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48338 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238264AbhHRGYr (ORCPT ); Wed, 18 Aug 2021 02:24:47 -0400 Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B092C061796 for ; Tue, 17 Aug 2021 23:24:13 -0700 (PDT) Received: by mail-pg1-x533.google.com with SMTP id w8so1185815pgf.5 for ; Tue, 17 Aug 2021 23:24:13 -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=sw/Jd50933MgMDKcslseqtGFSA6d20C1365G+gy2Cx4=; b=lkb90SqGpvhafiRjISSgB0a2FrYdpBXG9CDn9kyMEGK8G+C6mKoqovQIKPmXFTd6fX KhJkX9Egylj1mwlSIMLNcs5ZBl52s9MtlmYUhK0Xdyehqw1A6JTalUf7LXgHvquVhuiB vdvmLxRGM0/kjfEaChvj3QOfSe7n54uv/XChU= 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=sw/Jd50933MgMDKcslseqtGFSA6d20C1365G+gy2Cx4=; b=KoV3yjQ1JEDlLes10p33ArNf25T7Y/3nJCT8te8pSjj8t7gV4nWwbTKyNrA6q1TTZ4 9mwcIfCNuLm35yKaqOnrEMuxxdZoRlRjLu4QDGHzI9eH5aFHTStBo161/mxmVZjI2rat PCx800LCaq9yr7U5OfjCQZwXDBR2C14O96Z9I5Xht6TCAZNezKU1zvtAmHZRZRRzu44e a9jCTZs1itTiiUdI2TEJ8Bb77Js0HxMdubkCdABt6WwOoPztBnFPbFUGm7g1ZYIZXnJ+ phrNPWVw8lCcvkS2jHAT+wP9ACSfVuYM7Hxl+EXuIWj0yO/Rtw9j1vU4Z9Tha9wOOa+u R3OQ== X-Gm-Message-State: AOAM531lh5rqF7vLaSzwD2GvFq7USaLukReK2K1P6qj/H445lVBcaO1Z mhV5rNRVQtHiNn37NdzuOKyLXA== X-Google-Smtp-Source: ABdhPJy9CLfg35oDbbdeQsU7HbtEw7JEEvFjjstjJ1u7tRCnU3ll7bgG1jvkDuiyrvoW+GnkiwkfjA== X-Received: by 2002:a63:fb08:: with SMTP id o8mr7314165pgh.72.1629267853126; Tue, 17 Aug 2021 23:24:13 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id n13sm4501409pff.164.2021.08.17.23.24.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:24:12 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Harald Welte , Arnd Bergmann , Greg Kroah-Hartman , "Gustavo A. R. Silva" , Andrew Morton , 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, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 52/63] cm4000_cs: Use struct_group() to zero struct cm4000_dev region Date: Tue, 17 Aug 2021 23:05:22 -0700 Message-Id: <20210818060533.3569517-53-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818060533.3569517-1-keescook@chromium.org> References: <20210818060533.3569517-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1756; h=from:subject; bh=J4NGkJQCgahZv2zewL/wYUO+MpNSkAZfZF2EdzgyTRQ=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMplIHvWiwQENOF2c7XlC/x85JbSdFgE5kqsWuK 0OxdRfuJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjKQAKCRCJcvTf3G3AJtHPD/ 9w1C3xZTkrQOl8qCphP1NuYb6Zzm4m2uWKaotV03HQ6T9nZ1pYcDMMaHhAraQDtG/+gMBjur6kCewv ayrtSdcUPKzKabKpDYkkQQGEE9qhvOYR4et5WymZDf+eN80rUG6e4eGkoBaSg8aVufvzlEbWGGJI1g tqDg4cuv/AswW6J0SfIjA0LGvOcP86foOnbG0fLo1CjkuPmC73qAisdtYqZ728UwCF73xtFOwOcz58 eqjKu4Hpj2sUaNV2ghIn1t2tsXH9VMc5RRvDzUnjKE8WQiYMXT1GnQMQC30RP8X5s0vnTZZK9COqg4 oewq2GoOKKBWejZCZnIt2PWaHfLpUYE3cXHVsUUrUzVwgg/Sk3purVXNGauBM7zNDyMu+OqTX4ib/A +HNqKaO/5WxWULHr6ttMgZKJiYQpCIvqqVqyHlMArxKxGWwiOSShxbeoadhVmd0SxeqdGPdNCiAuk6 FFaKdGvO/XR7rdo2FnWbhYIs1bjRjMoCnyn4vUMe6sRx6ESs8Bvvf+nu0uOBDONLatp0KRkgfFUvYM i85g6GvFHJOXM2duu8wB+SxG0oCcvOTXiLpU3c5ok266H6TYTMs6yQQ6fEkcPZU/wwc56QrWbNdrgO Cwck+Q8ubdcpIlRqgjAb6NEZ7diJsEGXAyIkWnhUKNVIgROWsl4C+tImakjQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@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 struct_group() to mark region of struct cm4000_dev that should be initialized to zero. Cc: Harald Welte Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Signed-off-by: Kees Cook Acked-by: Greg Kroah-Hartman Link: https://lore.kernel.org/lkml/YQDvxAofJlI1JoGZ@kroah.com --- drivers/char/pcmcia/cm4000_cs.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c index 8f1bce0b4fe5..2f43e7088e16 100644 --- a/drivers/char/pcmcia/cm4000_cs.c +++ b/drivers/char/pcmcia/cm4000_cs.c @@ -116,8 +116,9 @@ struct cm4000_dev { wait_queue_head_t atrq; /* wait for ATR valid */ wait_queue_head_t readq; /* used by write to wake blk.read */ - /* warning: do not move this fields. + /* warning: do not move this struct group. * initialising to zero depends on it - see ZERO_DEV below. */ + struct_group(init, unsigned char atr_csum; unsigned char atr_len_retry; unsigned short atr_len; @@ -140,12 +141,10 @@ struct cm4000_dev { struct timer_list timer; /* used to keep monitor running */ int monitor_running; + ); }; -#define ZERO_DEV(dev) \ - memset(&dev->atr_csum,0, \ - sizeof(struct cm4000_dev) - \ - offsetof(struct cm4000_dev, atr_csum)) +#define ZERO_DEV(dev) memset(&dev->init, 0, sizeof(dev->init)) static struct pcmcia_device *dev_table[CM4000_MAX_DEV]; static struct class *cmm_class;