From patchwork Fri Aug 6 20:08:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 12423779 X-Patchwork-Delegate: kuba@kernel.org 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=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 0B2F4C43214 for ; Fri, 6 Aug 2021 20:09:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E381660D07 for ; Fri, 6 Aug 2021 20:09:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244575AbhHFUJV (ORCPT ); Fri, 6 Aug 2021 16:09:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244441AbhHFUJS (ORCPT ); Fri, 6 Aug 2021 16:09:18 -0400 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 079F7C0613CF for ; Fri, 6 Aug 2021 13:09:02 -0700 (PDT) Received: by mail-pj1-x102d.google.com with SMTP id pj14-20020a17090b4f4eb029017786cf98f9so19580940pjb.2 for ; Fri, 06 Aug 2021 13:09:02 -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:mime-version :content-transfer-encoding; bh=n6L9lQWvGLp2RmRr83sqFXDKRaXPPCi+3uhrZ6kADNA=; b=nWIt5g3GXVnW5z2AYO8uYLJsBM6J19V+JIVdl7YLTXZFqY7W9ei9/SgJ1UmRs6mpSt Sgf7eH9PcaBa1aXMpzUtoN8DPYTYyMKbZdxMdXYTGNWSnoGW6Y5HgZuwuV739iqL14gA jgS2A68AoBOi9b0r8dz5V8+OUWGDinrYH2T2g= 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:mime-version :content-transfer-encoding; bh=n6L9lQWvGLp2RmRr83sqFXDKRaXPPCi+3uhrZ6kADNA=; b=g8YF7Lh9MvymG/l6gDoaQ9BKNdwn4tC23rX/+sYvpzXJyXLV+3D4DnkKd52yKpSTfS xxaDmvAJEZuuQZf9tKpsm+G2ERoHcOarO55LDp4xznophaFL4h9E9mBy1TNCtuKek7IC M7Mk6gxj0tqki/YumFuXLsuDCywVktGlW0MN2xkteMj3K0EtPI1c0w8mv8eRg6Banmgy s7e49jZOfdz9JKUSxtWBON3qRT/sJoCSxA0pxtggyWrEvBC/pMtBSdeSgjlpP8eE2sB0 qboXns+mQQg4wWH73f8zZrKyy46l0xgVJjTuVzSo9IAOBzPyWd98hmXiHYLTaSWXkDEI u+4g== X-Gm-Message-State: AOAM531JD5aV0BcmLQJOirlpLEsgKtWpv3n2CotHuLUne+uBTHCz1u1O UzIdd+cSHghC5CpEUix7ydYF+A== X-Google-Smtp-Source: ABdhPJyaXk/keHXFRBUqFrft8A94/ur96J4Pv6Rk2fUUwU/ShuzzjV/o1/H164HklzW6ysO8GRYZvQ== X-Received: by 2002:a17:902:7b8b:b029:12b:8d3e:70e7 with SMTP id w11-20020a1709027b8bb029012b8d3e70e7mr3840249pll.76.1628280541543; Fri, 06 Aug 2021 13:09:01 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id b20sm10911854pfl.9.2021.08.06.13.09.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Aug 2021 13:09:01 -0700 (PDT) From: Kees Cook To: Stanislav Yakovlev Cc: Kees Cook , Kalle Valo , "David S. Miller" , Jakub Kicinski , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] ipw2x00: Avoid field-overflowing memcpy() Date: Fri, 6 Aug 2021 13:08:55 -0700 Message-Id: <20210806200855.2870554-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4665; h=from:subject; bh=6caGhOOY446DlpmdSUBQVYbe7alelvqjsReWU0FV/Ck=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhDZbWlqznbRsXo6uyVHMPyqNKwaw98x0jc7wCkSGo 4cEIMHSJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQ2W1gAKCRCJcvTf3G3AJi8lD/ 9jkPT4xmisHW9IgfwnETPhxevmZe48HyNSPt0ogmaNIQR3nP17BoJqLqbh1kgsgpeDUDDsDy1ua+mO gcrIcZOgYrYrht+RcOiVxnah/a5qQ42tAEaG6f079GUNRdCRUStdeSpRr+P/jfg24QD7+o4gkPsveA WNEwu5IwBUOg6BZ5NR9Umi1zzuf4ApLASOjiQd2q7bnbD+5mGUX3hN7r8dIyp+vrW3+fidwZrgB65n E7eYABTLvNzW1B9QaiGYO0GHFY6a4by6nBT7vzxAxnziKpACP9ByPGpf4WbAwzihh2Odhf5BDtdpD5 uaaJpEJhHMrUgFGvB8Mo0CSqIeKn9owfuOQdo8Rq5KfMHyygDQaD6cVt6uijgZBvA4P1tt9pVzOd9Q f232tFq+SFm0S4xmo+WIs/+YS9wFU66rn/33cWapsMrl297Kf/HHTlQPHz6fKMfbyijX9yqJVcVzNQ HygM9SfHUjQP9RqhiuX4DK9oXycQ6LY3iuV+e4A40NGlSoA5RDiJm8eFZEOPtDbviGGvo5YdQCpoxP aguORZY7LbjDEoI6XbdHLAPO/Q9aWARrUEXlleSGt4kFXPSmXNGB22KWAx2KdEftHEFbdxkHuy+xP/ qUd2YeQXVndotuUf4y6ZzFm854RDTRIRgnzTgcBmD4u8iG+0t1d754v5DEnQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memcpy(), memmove(), and memset(), avoid intentionally writing across neighboring fields. libipw_read_qos_param_element() copies a struct libipw_info_element into a struct libipw_qos_information_element, but is actually wanting to copy into the larger struct libipw_qos_parameter_info (the contents of ac_params_record[] is later examined). Refactor the routine to perform centralized checks, and copy the entire contents directly (since the id and len members match the elementID and length members): struct libipw_info_element { u8 id; u8 len; u8 data[]; } __packed; struct libipw_qos_information_element { u8 elementID; u8 length; u8 qui[QOS_OUI_LEN]; u8 qui_type; u8 qui_subtype; u8 version; u8 ac_info; } __packed; struct libipw_qos_parameter_info { struct libipw_qos_information_element info_element; u8 reserved; struct libipw_qos_ac_parameter ac_params_record[QOS_QUEUE_NUM]; } __packed; Cc: Kalle Valo Cc: "David S. Miller" Cc: Jakub Kicinski Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook Reported-by: kernel test robot --- .../net/wireless/intel/ipw2x00/libipw_rx.c | 56 ++++++------------- 1 file changed, 17 insertions(+), 39 deletions(-) diff --git a/drivers/net/wireless/intel/ipw2x00/libipw_rx.c b/drivers/net/wireless/intel/ipw2x00/libipw_rx.c index 5a2a723e480b..7cda31e403bd 100644 --- a/drivers/net/wireless/intel/ipw2x00/libipw_rx.c +++ b/drivers/net/wireless/intel/ipw2x00/libipw_rx.c @@ -927,7 +927,8 @@ static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 }; static int libipw_verify_qos_info(struct libipw_qos_information_element *info_element, int sub_type) { - + if (info_element->elementID != QOS_ELEMENT_ID) + return -1; if (info_element->qui_subtype != sub_type) return -1; if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN)) @@ -943,57 +944,34 @@ static int libipw_verify_qos_info(struct libipw_qos_information_element /* * Parse a QoS parameter element */ -static int libipw_read_qos_param_element(struct libipw_qos_parameter_info - *element_param, struct libipw_info_element - *info_element) +static int libipw_read_qos_param_element( + struct libipw_qos_parameter_info *element_param, + struct libipw_info_element *info_element) { - int ret = 0; - u16 size = sizeof(struct libipw_qos_parameter_info) - 2; + size_t size = sizeof(*element_param); - if ((info_element == NULL) || (element_param == NULL)) + if (!element_param || !info_element || info_element->len != size - 2) return -1; - if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) { - memcpy(element_param->info_element.qui, info_element->data, - info_element->len); - element_param->info_element.elementID = info_element->id; - element_param->info_element.length = info_element->len; - } else - ret = -1; - if (ret == 0) - ret = libipw_verify_qos_info(&element_param->info_element, - QOS_OUI_PARAM_SUB_TYPE); - return ret; + memcpy(element_param, info_element, size); + return libipw_verify_qos_info(&element_param->info_element, + QOS_OUI_PARAM_SUB_TYPE); } /* * Parse a QoS information element */ -static int libipw_read_qos_info_element(struct - libipw_qos_information_element - *element_info, struct libipw_info_element - *info_element) +static int libipw_read_qos_info_element( + struct libipw_qos_information_element *element_info, + struct libipw_info_element *info_element) { - int ret = 0; - u16 size = sizeof(struct libipw_qos_information_element) - 2; + size_t size = sizeof(struct libipw_qos_information_element) - 2; - if (element_info == NULL) + if (!element_info || info_element || info_element->len != size - 2) return -1; - if (info_element == NULL) - return -1; - - if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) { - memcpy(element_info->qui, info_element->data, - info_element->len); - element_info->elementID = info_element->id; - element_info->length = info_element->len; - } else - ret = -1; - if (ret == 0) - ret = libipw_verify_qos_info(element_info, - QOS_OUI_INFO_SUB_TYPE); - return ret; + memcpy(element_info, info_element, size); + return libipw_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE); } /*