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=-1.4 required=3.0 tests=DATE_IN_PAST_03_06, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 8C729C4CEC8 for ; Sat, 14 Sep 2019 00:51:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7045E20693 for ; Sat, 14 Sep 2019 00:51:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390905AbfINAvF (ORCPT ); Fri, 13 Sep 2019 20:51:05 -0400 Received: from mga05.intel.com ([192.55.52.43]:51748 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388072AbfINAvF (ORCPT ); Fri, 13 Sep 2019 20:51:05 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Sep 2019 17:51:04 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,492,1559545200"; d="scan'208";a="190482519" Received: from aayang-mobl1.amr.corp.intel.com (HELO [10.251.29.131]) ([10.251.29.131]) by orsmga006.jf.intel.com with ESMTP; 13 Sep 2019 17:51:02 -0700 Subject: Re: [PATCH v22 00/24] Intel SGX foundations To: Jarkko Sakkinen , linux-kernel@vger.kernel.org, x86@kernel.org, linux-sgx@vger.kernel.org Cc: akpm@linux-foundation.org, sean.j.christopherson@intel.com, nhorman@redhat.com, npmccallum@redhat.com, serge.ayoun@intel.com, shay.katz-zamir@intel.com, haitao.huang@intel.com, andriy.shevchenko@linux.intel.com, tglx@linutronix.de, kai.svahn@intel.com, bp@alien8.de, josh@joshtriplett.org, luto@kernel.org, kai.huang@intel.com, rientjes@google.com, cedric.xing@intel.com References: <20190903142655.21943-1-jarkko.sakkinen@linux.intel.com> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190903142655.21943-1-jarkko.sakkinen@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/3/19 7:26 AM, Jarkko Sakkinen wrote: > Not having LSM hooks does not cause any risk to other parts of the > kernel as the device can still be controlled by using DAC permissions. > The hooks just provide more granularity than DAC in access decisions. Could we translate the security-speak to english, please? :) Is this it: LSMs can (try to) enforce things like "all executable code must be verified". The implementation in these patches has the potential to subvert policies like that since it has its own unique mechanisms for loading and mapping executable code. This will be fixed by future LSM enhancements on top of this set. For now, permissions on the SGX device file should be used to prevent untrusted users from using SGX to subvert LSM policies. ?