Re: [PATCH/RFC] Shared page tables

Andi Kleen
2006-01-24T01:38:29Z

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