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Fri, 6 Nov 2020 17:54:22 +0000 (UTC) IronPort-SDR: jmXooL1h14zsAmjELOdSEQKEIEBDqCBjtwfsEWVfDmZt1yQEzP6zPI/y+3WHDhAzy0IuKxUs+r 3Jf0JDiCmAwA== X-IronPort-AV: E=McAfee;i="6000,8403,9797"; a="156578252" X-IronPort-AV: E=Sophos;i="5.77,457,1596524400"; d="scan'208";a="156578252" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Nov 2020 09:54:21 -0800 IronPort-SDR: aElJFXq+yKY7KgEB9/MqrP6hi4lHrPJri3b381KeIB7BQHcqTo4QdTNWKtitO+Ey1GjJrxdFWH pICzZwLf+cow== X-IronPort-AV: E=Sophos;i="5.77,457,1596524400"; d="scan'208";a="539927603" Received: from mburzach-mobl2.amr.corp.intel.com (HELO [10.251.1.178]) ([10.251.1.178]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Nov 2020 09:54:19 -0800 Subject: Re: [PATCH v40 10/24] mm: Add 'mprotect' hook to struct vm_operations_struct To: "Dr. Greg" , Jarkko Sakkinen Cc: x86@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Christopherson , linux-mm@kvack.org, Andrew Morton , Matthew Wilcox , Jethro Beekman , Darren Kenny , andriy.shevchenko@linux.intel.com, asapek@google.com, bp@alien8.de, cedric.xing@intel.com, chenalexchen@google.com, conradparker@google.com, cyhanish@google.com, haitao.huang@intel.com, kai.huang@intel.com, kai.svahn@intel.com, kmoy@google.com, ludloff@google.com, luto@kernel.org, nhorman@redhat.com, npmccallum@redhat.com, puiterwijk@redhat.com, rientjes@google.com, tglx@linutronix.de, yaozhangx@google.com, mikko.ylinen@intel.com References: <20201104145430.300542-1-jarkko.sakkinen@linux.intel.com> <20201104145430.300542-11-jarkko.sakkinen@linux.intel.com> <20201106174359.GA24109@wind.enjellic.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: <20201106174359.GA24109@wind.enjellic.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 11/6/20 9:43 AM, Dr. Greg wrote: > In light of this, given the decision by the driver authors to not > fully equip the driver with EDMM support, the mprotect protection > requirements are straight forward and minimalistic. All that is > needed is a binary valued variable, set on the command-line, that > either allows or denies anonymous code execution by an enclave, > ie. access to page protection changes after initialization. To that, I say NAK. We need more flexibility than a boot-time-fixed, system-wide switch.