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Date: Thu, 21 Jun 2018 07:56:42 +0300
From: Georgi Guninski <guninski@...inski.com>
To: oss-security@...ts.openwall.com
Cc: secure@...el.com
Subject: Re: Intel hyper-threading security issues

On Wed, Jun 20, 2018 at 12:48:55AM +0400, Loganaden Velvindron wrote:
> Hi all,
> 
> OpenBSD has gone ahead and disabled Intel Hyper threading with a
> fairly detailed comment about the reasons behind:
> 
> https://www.mail-archive.com/source-changes@openbsd.org/msg99141.html
>

Freebsd:

https://www.freebsd.org/security/advisories/FreeBSD-SA-05:09.htt.asc
Topic:          information disclosure when using HTT
Announced:      2005-05-13
When running on processors supporting Hyper-Threading Technology, it is
possible for a malicious thread to monitor the execution of another
thread.
V.   Solution

Disable Hyper-Threading Technology on processors that support it.
 

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