Re: [PATCH/RFC] Shared page tables

[Andi Kleen]

On Tuesday 24 January 2006 02:23, Benjamin LaHaise wrote:
> On Tue, Jan 24, 2006 at 02:10:03AM +0100, Andi Kleen wrote:
> > The randomization is not for cache coloring, but for security purposes
> > (except for the old very small stack randomization that was used
> > to avoid conflicts on HyperThreaded CPUs). I would be surprised if the
> > mmap made much difference because it's page aligned and at least
> > on x86 the L2 and larger caches are usually PI.
> 
> Actually, does this even affect executable segments?  Iirc, prelinking 
> already results in executables being mapped at the same physical offset 
> across binaries in a given system.  An strace seems to confirm that.

Shared libraries should be affected. And prelink is not always used.

-Andi
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