linux-kernel - Re: [PATCH v6 00/11] Intel SGX Driver

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Date:   Tue, 9 Jan 2018 16:25:06 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     greg@...ellic.com
Cc:     Pavel Machek <pavel@....cz>, platform-driver-x86@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...e.de>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>,
        Haim Cohen <haim.cohen@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Jim Mattson <jmattson@...gle.com>,
        Kan Liang <Kan.liang@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Kyle Huey <me@...ehuey.com>, Len Brown <len.brown@...el.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "open list:FILESYSTEMS (VFS and infrastructure)" 
        <linux-fsdevel@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Piotr Luc <piotr.luc@...el.com>,
        Radim Kr??m???? <rkrcmar@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Subject: Re: [PATCH v6 00/11] Intel SGX Driver

On Thu, Jan 04, 2018 at 03:06:43AM -0600, Dr. Greg Wettstein wrote:
> If we are talking about the issues motivating the KPTI work I don't
> have any useful information beyond what is raging through the industry
> right now.
> 
> With respect to SGX, the issues giving rise to KPTI are characteristic
> of what this technology is designed to address.  The technical 'news'
> sites, which are even more of an abomination then usual with this
> issue, are talking about privileged information such as credentials,
> passwords et.al being leaked by this vulnerability.
> 
> Data committed to enclaves are only accessible by the enclave, even
> the kernel, by definition, can't access the memory.  Given current
> events that is an arguably useful behavior.

Exactly. You could think adversary using meltdown leak utilizing malware
as having same capabilities as peripheral connected to a bus, which we
can defend against with SGX.

/Jarkko