linux-kernel - Re: [PATCH v38 17/24] x86/sgx: ptrace() support for the SGX driver

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Date:   Wed, 23 Sep 2020 18:17:33 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jethro Beekman <jethro@...tanix.com>,
        akpm@...ux-foundation.org, andriy.shevchenko@...ux.intel.com,
        asapek@...gle.com, cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, npmccallum@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, sean.j.christopherson@...el.com,
        tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v38 17/24] x86/sgx: ptrace() support for the SGX driver

On Wed, Sep 23, 2020 at 04:20:49PM +0300, Jarkko Sakkinen wrote:
> Intel Sofware Guard eXtensions (SGX) allows creation of executable blobs
> called enclaves, which cannot be accessed by default when not executing
> inside the enclave. Enclaves can be entered by only using predefined memory
> addresses, which are defined the enclave is loaded.
			      ^
			      "when" or "before". I think it is before.

> However, enclaves can defined as debug enclaves during the load time. In

"However, enclaves can be defined as debug enclaves at load time."

> debug enclaves data can be read and/or written a memory word at a time by
> using by using ENCLS[EDBGRD] and ENCLS[EDBGWR] leaf instructions.

only one "by using" is enough.

> Add 'access' implementation to vm_ops with the help of these functions.

"Add an ->access virtual MM function for accessing the enclave's memory... "

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette