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

[Dave Hansen]

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.