linux-kernel - Re: [PATCH v14 19/19] x86/sgx: Driver documentation

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Message-ID: <fe28962d-367b-b8bb-8280-fe48c7d08813@intel.com>
Date:   Wed, 17 Oct 2018 16:56:51 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Pavel Machek <pavel@....cz>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     x86@...nel.org, platform-driver-x86@...r.kernel.org,
        sean.j.christopherson@...el.com, nhorman@...hat.com,
        npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, linux-sgx@...r.kernel.org,
        andriy.shevchenko@...ux.intel.com,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v14 19/19] x86/sgx: Driver documentation

On 10/15/2018 01:54 PM, Pavel Machek 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.
> Well, recently hardware had some problems keeping its
> promises. So... what about rowhammer, meltdown and spectre?

There's a ton of documentation out there about what kinds of protections
SGX provides.  I don't think this is an appropriate place to have an
exhaustive discussion about it.  But, there's extensive discussion of it
on Intel's security site:

https://software.intel.com/security-software-guidance/

There's documentation on how L1TF affects SGX here:

https://software.intel.com/security-software-guidance/software-guidance/l1-terminal-fault

Or Spectre v2 here:

https://software.intel.com/security-software-guidance/software-guidance/bounds-check-bypass

> Which ones apply, which ones do not, and on what cpu generations?

The CVEs list this in pretty exhaustive detail.  The L1TF/SGX one, for
example:

https://nvd.nist.gov/vuln/detail/CVE-2018-3615

Lists a bunch of processor models.