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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 7C2E7C07E9E for ; Tue, 6 Jul 2021 20:53:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61E9A61CA2 for ; Tue, 6 Jul 2021 20:53:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230091AbhGFU4G (ORCPT ); Tue, 6 Jul 2021 16:56:06 -0400 Received: from mga05.intel.com ([192.55.52.43]:29324 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229781AbhGFU4F (ORCPT ); Tue, 6 Jul 2021 16:56:05 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10037"; a="294834127" X-IronPort-AV: E=Sophos;i="5.83,329,1616482800"; d="scan'208";a="294834127" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jul 2021 13:53:23 -0700 X-IronPort-AV: E=Sophos;i="5.83,329,1616482800"; d="scan'208";a="486526274" Received: from thaovo-mobl1.amr.corp.intel.com (HELO [10.209.81.14]) ([10.209.81.14]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jul 2021 13:53:22 -0700 Subject: Re: [PATCH 2/4] selftests/sgx: Fix Q1 and Q2 calculation in sigstruct.c To: Jarkko Sakkinen , Shuah Khan Cc: linux-kselftest@vger.kernel.org, linux-sgx@vger.kernel.org, Reinette Chatre , Borislav Petkov , Tianjia Zhang , Dave Hansen , Jethro Beekman , Borislav Petkov , linux-kernel@vger.kernel.org References: <20210705143652.116125-1-jarkko@kernel.org> <20210705143652.116125-3-jarkko@kernel.org> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210705143652.116125-3-jarkko@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/5/21 7:36 AM, Jarkko Sakkinen wrote: > From: Tianjia Zhang > > Q1 and Q2 are numbers with *maximum* length of 384 bytes. If the calculated > length of Q1 and Q2 is less than 384 bytes, things will go wrong. > > E.g. if Q2 is 383 bytes, then > > 1. The bytes of q2 are copied to sigstruct->q2 in calc_q1q2(). > 2. The entire sigstruct->q2 is reversed, which results it being > 256 * Q2, given that the last byte of sigstruct->q2 is added > to before the bytes given by calc_q1q2(). > > Either change in key or measurement can trigger the bug. E.g. an unmeasured > heap could cause a devastating change in Q1 or Q2. > > Reverse exactly the bytes of Q1 and Q2 in calc_q1q2() before returning to > the caller. > > Fixes: 2adcba79e69d ("selftests/x86: Add a selftest for SGX") > Link: https://lore.kernel.org/linux-sgx/20210301051836.30738-1-tianjia.zhang@linux.alibaba.com/ > Signed-off-by: Tianjia Zhang > Signed-off-by: Jarkko Sakkinen This looks fine, but can I suggest a Subject: tweak? selftests/sgx: Fix calculations for sub-maximum field sizes In any case: Reviewed-by: Dave Hansen