Messages in this thread | | | Date | Wed, 31 Aug 2005 14:42:38 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: [PATCH 1/1] Implement shared page tables |
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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.
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