cvs commit: src/sys/i386/i386 local_apic.c src/sys/amd64/amd64 local_apic.c

[Nate Lawson]

Maxim Sobolev wrote:
> sobomax     2006-11-29 01:19:23 UTC
> 
>   FreeBSD src repository
> 
>   Modified files:        (Branch: RELENG_6)
>     sys/i386/i386        local_apic.c 
>     sys/amd64/amd64      local_apic.c 
>   Log:
>   Another attempt to MFC changes that prevent any accounting for the disabled
>   HTT cores. This time make code conditional on !defined(SCHED_ULE), since
>   SCHED_ULE is generally b0rken due to the fact that it doesn't honour
>   hlt_cpus_mask when scheduling processes like all other schedulers in the
>   system do.
>   
>   I am not sure if such SCHED_ULE behaviour should be considered as a
>   security flaw, basically it means that anybody running SCHED_ULE kernel
>   on HTT system still affected by FreeBSD-SA-05:09.htt.
>   
>   Revision   Changes    Path
>   1.17.2.11  +16 -0     src/sys/amd64/amd64/local_apic.c
>   1.17.2.11  +16 -0     src/sys/i386/i386/local_apic.c

No, since FreeBSD-SA-05:09.htt is not a HTT problem, it's a cache 
problem that is exploitable on single thread/core systems as well.

-- 
Nate