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

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Date:   Thu, 8 Feb 2018 15:48:28 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Cedric Blancher <cedric.blancher@...il.com>,
        platform-driver-x86@...r.kernel.org, x86@...nel.org,
        Linux Kernel Mailing List <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 Krčmář <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, Feb 08, 2018 at 09:46:53AM +0100, Pavel Machek wrote:
> On Tue 2018-01-09 16:27:30, Jarkko Sakkinen wrote:
> > On Thu, Jan 04, 2018 at 03:17:24PM +0100, Cedric Blancher wrote:
> > > So how does this protect against the MELTDOWN attack (CVE-2017-5754)
> > > and the MELTATOMBOMBA4 worm which uses this exploit?
> > > 
> > > Ced
> > 
> > Everything going out of L1 gets encrypted. This is done to defend
> > against peripheral like adversaries and should work also against
> > meltdown.
> 
> Yeah, but useless against spectre and ability to introduce bit flips
> means this is generally useless...

You are right.

And what I said was simply false. In fact, the encryption is done in
LCC.  I'm sorry that I didn't response to my response and gave incorrect
info. I simply forgot to do this, no other excuses.

/Jarkko