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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 EBA16C43462 for ; Mon, 3 May 2021 16:44:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BA17161402 for ; Mon, 3 May 2021 16:44:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232314AbhECQpe (ORCPT ); Mon, 3 May 2021 12:45:34 -0400 Received: from mga18.intel.com ([134.134.136.126]:46799 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232721AbhECQmg (ORCPT ); Mon, 3 May 2021 12:42:36 -0400 IronPort-SDR: 0jt5G0JkIubNQtt8m4V+iOsyZ14Jl+dq9lLa8SZjDktRgG7spIGxHrNxescy2zwQKIEQroBoNt BoFa4SZzWvcQ== X-IronPort-AV: E=McAfee;i="6200,9189,9973"; a="185255906" X-IronPort-AV: E=Sophos;i="5.82,270,1613462400"; d="scan'208";a="185255906" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 May 2021 09:39:08 -0700 IronPort-SDR: yHHx6PtNpAh6T91PU1WyF1JBxOElKZhBJX7jRdG90CUzGWqR0/SKvxhbWG8N87EJ437DZ5xHWP DrnkL139eJUw== X-IronPort-AV: E=Sophos;i="5.82,270,1613462400"; d="scan'208";a="432824303" Received: from tbroiles-mobl.amr.corp.intel.com (HELO [10.209.47.222]) ([10.209.47.222]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 May 2021 09:39:07 -0700 Subject: Re: Subject: [PATCH 0/1] SGX self test fails To: Jarkko Sakkinen Cc: Tim Gardner , dave.hansen@linux.intel.com, shuah@kernel.org, linux-sgx@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210429183952.22797-1-tim.gardner@canonical.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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On 5/3/21 8:41 AM, Jarkko Sakkinen wrote: >> $ ls -l /dev/sgx_enclave >> crw------- 1 dave dave 10, 125 Apr 28 11:32 /dev/sgx_enclave >> $ ./test_sgx >> 0x0000000000000000 0x0000000000002000 0x03 >> 0x0000000000002000 0x0000000000001000 0x05 >> 0x0000000000003000 0x0000000000003000 0x03 >> SUCCESS >> >> *But*, is that OK? Should we be happily creating a PROT_EXEC mapping on >> a ugo-x file? Why were we respecting noexec on the filesystem but not >> ugo-x on the file? > Yeah, this supports my earlier response: > > "EPERM The prot argument asks for PROT_EXEC but the mapped area > belongs to a file on a filesystem that was mounted no-exec." > https://man7.org/linux/man-pages/man2/mmap.2.html > > I guess the right model is to think just as "anonymous memory" > with equivalent access control semantics after succesfully > opened for read and write. I guess I'll answer my own question: The "x" bit on file permissions really only controls the ability for the file to be execve()'d, but has no bearing on the ability for an executable *mapping* to be created. This is existing VFS behavior and is not specific to SGX. I think I'll just send a patch to pull that warning out.