linux-kernel - Re: [PATCH v11 00/13] Intel SGX1 support

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Message-ID: <20180619200414.GA3143@amd>
Date:   Tue, 19 Jun 2018 22:04:15 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     x86@...nel.org, platform-driver-x86@...r.kernel.org,
        dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com,
        Alexei Starovoitov <ast@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        "David S. Miller" <davem@...emloft.net>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        "open list:INTEL SGX" <intel-sgx-kernel-dev@...ts.01.org>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        "open list:KERNEL VIRTUAL MACHINE FOR X86 (KVM/x86)" 
        <kvm@...r.kernel.org>, Len Brown <len.brown@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:CRYPTO API" <linux-crypto@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:SPARSE CHECKER" <linux-sparse@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Subject: Re: [PATCH v11 00/13] Intel SGX1 support

On Tue 2018-06-19 17:59:43, Jarkko Sakkinen wrote:
> On Tue, Jun 12, 2018 at 12:50:12PM +0200, Pavel Machek wrote:
> > On Fri 2018-06-08 19:09:35, Jarkko Sakkinen wrote:
> > > Intel(R) SGX is a set of CPU instructions that can be used by applications
> > > to set aside private regions of code and data. The code outside the enclave
> > > is disallowed to access the memory inside the enclave by the CPU access
> > > control.  In a way you can think that SGX provides inverted sandbox. It
> > > protects the application from a malicious host.
> > 
> > Do you intend to allow non-root applications to use SGX?
> > 
> > What are non-evil uses for SGX?
> > 
> > ...because it is quite useful for some kinds of evil:
> 
> The default permissions for the device are 600.

Good. This does not belong to non-root. But question still remains:

What are some non-evil uses for SGX?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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