From patchwork Tue Jul 27 20:58:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 12403933 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=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 C979DC4338F for ; Tue, 27 Jul 2021 21:07:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B653960F94 for ; Tue, 27 Jul 2021 21:07:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233834AbhG0VHO (ORCPT ); Tue, 27 Jul 2021 17:07:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55902 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233300AbhG0VHB (ORCPT ); Tue, 27 Jul 2021 17:07:01 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 58191C061760 for ; Tue, 27 Jul 2021 14:06:59 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id j1so1815865pjv.3 for ; Tue, 27 Jul 2021 14:06:59 -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=eHJ5K8LiDBXCeTCe7PvgaP3UqQR5uDLvklqQUiAbnC0=; b=C9odf/LxM8hQlFgEX94OyyWcybtfMz5fkcvxUOiwkptiFAnxb7Vjc9j5fcILzWzUe0 9SXGn/8zZ/4rPOmwRPn9BGvFK32z6oyRZbo5d8AQJpThOjubhaqeuoW3W01DCWdHwowW ZQKSKYcukTOUL4ao1lnoeA3vzowcOeQgLkBm8= 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=eHJ5K8LiDBXCeTCe7PvgaP3UqQR5uDLvklqQUiAbnC0=; b=Q08FAlgI1kePUqrxm252ThczQMeoKfprLxVK0vZU929NMjSzEL60HlsJTu0PA6/LCR GssDfnelakGE50KUFDIFDlCoGaNWN9tNMRD+46CKOPqXmIiyH6xRjz8XMqhToZX11qNC Dc45+0Ns9U24WKbDSoUfYsY9kMPqaMv/22WXAE38cV0Vfl61ix4dqFOXur+pM5vdvq5s sjzpiFH5mdRaSqHcEVYwsD5YmbWJW6CsaHHJj4DMTbaXxUiXqjyYt4N7kmQI1gjvrk4C 2fBO71TDykjUjtoxsyuFgAcyqvLiPy8mUbZ/iTnSLyt8/mjjwg+KLRmuRAhPufjoKCOc HKSQ== X-Gm-Message-State: AOAM531R04vm2c5BtwQ+ZlHaWBVHRvAqYIRaLJneR7o6HPIBWhCbQmSM DXYOlZ/dJIOD7EFyciYb5lq86g== X-Google-Smtp-Source: ABdhPJyiPLiIxF0eZ6Ht4eersAStzTtAa77UuUUu3QKRioXbvWIKsuENyKgvU1Bb8BbQdCxPR7B6MQ== X-Received: by 2002:a05:6a00:cc1:b029:32b:8465:9b59 with SMTP id b1-20020a056a000cc1b029032b84659b59mr24967310pfv.66.1627420018950; Tue, 27 Jul 2021 14:06:58 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id r128sm4687668pfc.155.2021.07.27.14.06.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:55 -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 63/64] iwlwifi: dbg_ini: Split memcpy() to avoid multi-field write Date: Tue, 27 Jul 2021 13:58:54 -0700 Message-Id: <20210727205855.411487-64-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=1543; h=from:subject; bh=s7Xq57zTgnpQLZW9o4dFqvke+b60yZlygvvLnoMj4dM=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOO7ylJm1Pef8Nw2Y9AVMYN/aYHsm9YN/NkJMM0 14MmcVqJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzjgAKCRCJcvTf3G3AJh5wD/ 0a9KvpCqyFZ9QKAdlblaiFHTvLu6J0I4KvuS/Pu8WGvbtdHoFcEc1A0J0FqancucuNe2oN76GijGN8 ZmNxkbLuDowcPvHB1KNKV+y/VKyD/GjTqJSFGbHSgE1d3XVQUqA8M80luRN12bHJex3vWEGlQIgVUS eo5mVVxa1vQFLA/APQtdO4QC3S0Rxaeq//vH7IZ+y8uTxf7ChRZtqCWERhOu6zi0YYM7UsadKsQ1UW kuKw1BHS6rVbpMLujJWWAPEyxEe0W/MD7sUJar7lh/sg2nbnVIlvXob+LuNF5xQtZwtIVnlj1/Tx1c JeZYoyxgw4/uvoQF/VaOiL8Fb1Mky8hA3J0Q0KSrMfDlDYr2psRQCz/wYgNiK8aZmkNvU6EyldhpRR jvpt2FEuN89iS51ofpMkKT9jWkj2G2IJnYUpSSBDS7x/6U33s9hWYtpjYFkmrtQS+KN+/zM7e0Wq85 h9kdtxEMB5GcqKunvfEzrJH/6l30zcuWdtxzKr+5eUMIzfT4m7IfJftQW1OHHiIRW8y1i2y9mOZGde lSqRZZ+xSG98+pb5deEI05oPi7AOE1XKeHnMMfVyygop9nOeSAmsJJWm+ExFOnNUkiTzMkM+sJqqiU uZuZWsn+50meKz7mBFEHFWpt++2rlXLf2jFCbTMaiMMKok79IQfcYfkHRDkg== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org To avoid a run-time false positive in the stricter FORTIFY_SOURCE memcpy() checks, split the memcpy() into the struct and the data. Additionally switch the data member to a flexible array to follow modern language conventions. Signed-off-by: Kees Cook --- drivers/net/wireless/intel/iwlwifi/fw/file.h | 2 +- drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/fw/file.h b/drivers/net/wireless/intel/iwlwifi/fw/file.h index 9a8c7b7a0816..226ccd3a6612 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/file.h +++ b/drivers/net/wireless/intel/iwlwifi/fw/file.h @@ -116,7 +116,7 @@ enum iwl_ucode_tlv_type { struct iwl_ucode_tlv { __le32 type; /* see above */ __le32 length; /* not including type/length fields */ - u8 data[0]; + u8 data[]; }; #define IWL_TLV_UCODE_MAGIC 0x0a4c5749 diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c index 0ddd255a8cc1..f4efddf3e3c3 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c @@ -71,7 +71,8 @@ static int iwl_dbg_tlv_add(const struct iwl_ucode_tlv *tlv, if (!node) return -ENOMEM; - memcpy(&node->tlv, tlv, sizeof(node->tlv) + len); + memcpy(&node->tlv, tlv, sizeof(node->tlv)); + memcpy(node->tlv.data, tlv->data, len); list_add_tail(&node->list, list); return 0;