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Thu, 24 Sep 2020 23:09:29 +0000 (UTC) IronPort-SDR: 200cyYuGEe2GD7lh87Zjhcl6FjOmuAsSNWSXhepac9V9OCjO0qfZsz4oJGSweMSQnTsrgTn0jt f/ZVD1BsUABA== X-IronPort-AV: E=McAfee;i="6000,8403,9754"; a="246166764" X-IronPort-AV: E=Sophos;i="5.77,299,1596524400"; d="scan'208";a="246166764" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2020 16:09:28 -0700 IronPort-SDR: x6iuQU9l8KUTTgwgBeYiWWIHrBtvxat7TMGquOy/C3Vkitx6gjBIpU68XXU2UC3+MbiHGJDPBA oCyiAbAOjn9g== X-IronPort-AV: E=Sophos;i="5.77,299,1596524400"; d="scan'208";a="487165962" Received: from ejarlos-mobl.amr.corp.intel.com (HELO [10.212.15.103]) ([10.212.15.103]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2020 16:09:26 -0700 Subject: Re: [PATCH v38 10/24] mm: Add vm_ops->mprotect() To: Sean Christopherson Cc: Haitao Huang , Jarkko Sakkinen , 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: <20200922053515.GA97687@linux.intel.com> <20200922164301.GB30874@linux.intel.com> <20200923135056.GD5160@linux.intel.com> <20200924192853.GA18826@linux.intel.com> <20200924200156.GA19127@linux.intel.com> <20200924202549.GB19127@linux.intel.com> <20200924230501.GA20095@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: <20200924230501.GA20095@linux.intel.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 9/24/20 4:05 PM, Sean Christopherson wrote: > The problem is that enforcing permissions via mprotect() needs to be do= ne > unconditionally, otherwise we end up with weird behavior where the exis= tence > of an LSM will change what is/isn't allowed, even if the LSM(s) has no = SGX > policy whatsover. Could we make this a bit less abstract, please? Could someone point to code or another examples that demonstrates how the mere existence of an LSM will change what is/isn't allowed? I can't seem to wrap my head around it as-is.