linux-kernel - Re: [PATCH 10/25] x86/sgx: Support enclave page permission changes

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Date:   Fri, 3 Dec 2021 10:14:59 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Reinette Chatre <reinette.chatre@...el.com>,
        dave.hansen@...ux.intel.com, jarkko@...nel.org, tglx@...utronix.de,
        bp@...en8.de, luto@...nel.org, mingo@...hat.com,
        linux-sgx@...r.kernel.org, x86@...nel.org
Cc:     seanjc@...gle.com, kai.huang@...el.com, cathy.zhang@...el.com,
        cedric.xing@...el.com, haitao.huang@...el.com,
        mark.shanahan@...el.com, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/25] x86/sgx: Support enclave page permission changes

On 12/1/21 11:23 AM, Reinette Chatre wrote:
> Enclave page permission changes need to be approached with care and
> for this reason this initial support is to allow enclave page
> permission changes _only_ if the new permissions are the same or
> more restrictive that the permissions originally vetted at the time the
> pages were added to the enclave. Support for extending enclave page
> permissions beyond what was originally vetted is deferred.

It's probably worth adding a few examples here:

 * RWX => RW => RX => RW => R => RWX
 * RW => R => RW
 * RX => R => RX