Re: [PATCH 1/1] Implement shared page tables

[Hugh Dickins]

On Wed, 31 Aug 2005, Arjan van de Ven wrote:
> On Wed, 2005-08-31 at 12:44 +0100, Hugh Dickins wrote:
> > I was going to say, doesn't randomize_va_space take away the rest of
> > the point?  But no, it appears "randomize_va_space", as it currently
> > appears in mainline anyway, is somewhat an exaggeration: it just shifts
> > the stack a little, with no effect on the rest of the va space.
> 
> it also randomizes mmaps

Ah, via PF_RANDOMIZE, yes, thanks: so long as certain conditions are
fulfilled - and my RLIM_INFINITY RLIMIT_STACK has been preventing it.

And mmaps include shmats: so unless the process specifies non-NULL
shmaddr to attach at, it'll choose a randomized address for that too
(subject to those various conditions).

Which is indeed a further disincentive against shared page tables.

Hugh
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