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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 4611FC4727E for ; Mon, 28 Sep 2020 14:04:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0CA5A21D7F for ; Mon, 28 Sep 2020 14:04:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726636AbgI1OEl (ORCPT ); Mon, 28 Sep 2020 10:04:41 -0400 Received: from mga11.intel.com ([192.55.52.93]:34831 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726281AbgI1OEl (ORCPT ); Mon, 28 Sep 2020 10:04:41 -0400 IronPort-SDR: aUtvYIForp7ysAl/qzHyJxl3HOdTLSKQ5WU2vpY4cdS3T1Nhzsje/wlIeKZmlmY4XU/A1s3Olb ZNLWomBnTyXA== X-IronPort-AV: E=McAfee;i="6000,8403,9757"; a="159339285" X-IronPort-AV: E=Sophos;i="5.77,313,1596524400"; d="scan'208";a="159339285" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2020 07:04:41 -0700 IronPort-SDR: bSjZtT+3Bd0LZJOmJVSs5VoAj1QCix81AP6hfFZuvRE2NDmeqjgL3xv0q7gE5S8+I7JZYywQsF rgejAw1wwU9g== X-IronPort-AV: E=Sophos;i="5.77,313,1596524400"; d="scan'208";a="293263820" Received: from kdeng-mobl.amr.corp.intel.com (HELO [10.212.231.239]) ([10.212.231.239]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2020 07:04:38 -0700 Subject: Re: [PATCH v38 10/24] mm: Add vm_ops->mprotect() To: Jarkko Sakkinen Cc: Sean Christopherson , Haitao Huang , Andy Lutomirski , X86 ML , linux-sgx@vger.kernel.org, LKML , Linux-MM , Andrew Morton , Matthew Wilcox , Jethro Beekman , Darren Kenny , Andy Shevchenko , asapek@google.com, Borislav Petkov , "Xing, Cedric" , chenalexchen@google.com, Conrad Parker , cyhanish@google.com, "Huang, Haitao" , Josh Triplett , "Huang, Kai" , "Svahn, Kai" , Keith Moyer , Christian Ludloff , Neil Horman , Nathaniel McCallum , Patrick Uiterwijk , David Rientjes , Thomas Gleixner , yaozhangx@google.com References: <20200924200156.GA19127@linux.intel.com> <20200924202549.GB19127@linux.intel.com> <20200924230501.GA20095@linux.intel.com> <20200925000052.GA20333@linux.intel.com> <32fc9df4-d4aa-6768-aa06-0035427b7535@intel.com> <20200925194304.GE31528@linux.intel.com> <230ce6da-7820-976f-f036-a261841d626f@intel.com> <20200928005347.GB6704@linux.intel.com> 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: <20200928005347.GB6704@linux.intel.com> 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 9/27/20 5:53 PM, Jarkko Sakkinen wrote: > On Fri, Sep 25, 2020 at 12:53:35PM -0700, Dave Hansen wrote: >> On 9/25/20 12:43 PM, Sean Christopherson wrote: >>>> That means that the intent argument (SGX_PROT_*) is currently unused. >>> No, the intent argument is used (eventually) by SGX's ->mprotect() >>> implementation, i.e. sgx_mprotect() enforces that the actual protections are a >>> subset of the declared/intended protections. >>> >>> If ->mprotect() is not merged, then it yes, it will be unused. >> >> OK, I think I've got it. >> >> I think I'm OK with adding ->mprotect(). As long as folks buy into the >> argument that intent needs to be checked at mmap() time, they obviously >> need to be checked at mprotect() too. >> >> Jarkko, if you want to try and rewrite the changelog, capturing the >> discussion here and reply, I think I can ack the resulting patch. I >> don't know if that will satisfy the request from Boris from an ack from >> a "mm person", but we can at least start there. :) > > I think what it needs, based on what I've read, is the step by step > description of the EMODPE scenarion without this callback and with it. EMODPE is virtually irrelevant for this whole thing. The x86 PTE permissions still specify the most restrictive permissions, which is what matters the most. We care about the _worst_ the enclave can do, not what it imposes on itself on top of that. > I think other important thing to underline is that an LSM or any other > security measure can only do a sane decision when the enclave is loaded. > At that point we know the source (vm_file). Right, you know the source, but it can be anonymous or a file.