5.4 not running HTT

[Steven Hartland]

[quote=FreeBSD-SA-05:09.htt.asc]

NOTE:  For users that are certain that their environment is not affected
by this vulnerability, such as single-user systems, Hyper-Threading
Technology may be re-enabled by setting the tunable
"machdep.hyperthreading_allowed".
[/quote]

----- Original Message ----- 
From: "Alex de Kruijff" <freebsd at akruijff.dds.nl>

> On Fri, Jun 10, 2005 at 03:06:51PM -0500, Stephen Montgomery-Smith wrote:
>> Steven Hartland wrote:
>> >Have a read /usr/src/UPDATING it explains.
>> >
>> 
>> It should be in /usr/src/UPDATING, but I don't see it there myself.
>> 
>> I got bitten by the same problem.  The other guy who gave
>> ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.htt.asc
>> provided the right answer, but it should be also mentioned in UPDATING.
> 
> Now it is. But its a bit vage. (i.e. what is a knob)
> 20050513:       p1      FreeBSD-SA-05:09.htt
>        Add a knob for disabling/enabling HTT.  Default off due to
> information
>        disclosure on multi-user systems.
> 
> I assume it can be turned on by
> echo 'kern.sched.ipiwakeup.htt2=1' >> /etc/sysctl.conf
> 
> --
> Alex
> 
>


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