Messages in this thread | | | Date | Fri, 25 Sep 2009 08:51:19 +0200 | From | Arjan van de Ven <> | Subject | Re: Immediate values |
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On Thu, 24 Sep 2009 21:34:22 +0200 Ingo Molnar <mingo@elte.hu> wrote:
> > * H. Peter Anvin <hpa@zytor.com> wrote: > > > I would like to get an official ACK or NAK for this patching > > technique from inside Intel, and preferrably from AMD as well. If > > it does work as described it would provide a very clean way to do > > one-shot alternative functions, which probably would be higher > > value than immediate data values. > > Sounds tempting. Things like the CONFIG_SECURITY hookery could use it? > > But ... since it's patched under stopmachine, is there any reason why > this wouldnt work? >
stopmachine is fine.
more aggressive tricks are rather dicey.
(cross modifying code that's being executed in ring 0 is ... not something CPU designers had in mind)
-- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org
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