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

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Message-ID: <20200924203859.GD108958@linux.intel.com>
Date:   Thu, 24 Sep 2020 23:38:59 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
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 Thu, Sep 24, 2020 at 05:57:51PM +0200, Borislav Petkov wrote:
> On Thu, Sep 24, 2020 at 02:51:28PM +0300, Jarkko Sakkinen wrote:
> > On Wed, Sep 23, 2020 at 06:17:33PM +0200, Borislav Petkov wrote:
> > > > Add 'access' implementation to vm_ops with the help of these functions.
> > > 
> > > "Add an ->access virtual MM function for accessing the enclave's memory... "
> > 
> > Thank you. I wrote the last paragraph like this:
> > 
> > "Add an '->access' virtual function for accessing the enclave's memory
> > to vm_ops by using these functions. This allows to use ptrace() with
> 
> "to vm_ops" must come after "function".
> 
> But lemme ask what is "vm_ops"?

I assume this is a rethorical question and I notice what I suggested
looks as bad as my earlier commit message :-)

So, I gave it some thought that and decided to "open code" the paragraph
as

"Add sgx_vma_access() function that implements 'access' virtual function
of struct vm_operations_struct. Use formentioned leaf instructions to
achieve read and write primitives for the enclave memory."

I think this starts to have the right balance and is understandable.

Still open for futher suggestion of course.

> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette

/Jarkko