lkml.org 
[lkml]   [2017]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5 11/11] intel_sgx: driver documentation
On Wed, Nov 15, 2017 at 12:54:12PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 14, 2017 at 10:49:48PM +0200, Jarkko Sakkinen wrote:
> > In these cases IA32_FEATURE_CONTROL[17] would be zeroed before locking
> > the feature control, which would mean that the kernel could not write
> > new values with wrmsr for the root key hash.
>
> > The question is whether we want to allow this or not. If the answer is
> > no, a check can be added to the driver initialization code whether 17 is
> > set, and if not, it driver would fail to initialize.
>
> That has my vote; I would not trust a firmware/BIOS key.

Please note that it does not have a key to look inside the enclave. The
enclave is protected by two means:

1. The CPU asserts the memory accesses to it.
2. The CPU encrypts/decrypts in L1 in order to protect from physical
attacks and peripherals that have potential spy the bus.

/Jarkko

\
 
 \ /
  Last update: 2017-11-20 23:46    [W:0.081 / U:3.496 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site