On Fri, 14 Nov 2014, Yinghai Lu wrote:
> On Fri, Nov 14, 2014 at 6:46 PM, Kees Cook <keesc...@chromium.org> wrote:
> > On Fri, Nov 14, 2014 at 6:29 PM, Yinghai Lu <ying...@kernel.org> wrote:
>
> >> should use attached one instead.
> >>
> >> 1. should use _brk_end instead of &end, as we only use partial of
> >> brk.
> >> 2. [_brk_end, pm_end) page range is already converted. aka
> >> is not wasted.
> >
> > Are you sure? For me, _brk_end isn't far enough:
> >
> > [ 1.475572] all_end: 0xffffffff82df5000
> > [ 1.476736] _brk_end: 0xffffffff82dd6000
>
> Yes. _brk_end should be small then &_end.
Wrong. _brk_end can move up to _end, i.e. to __brk_limit.
But it's safe to use _brk_end when mark_rodata_ro() is called because
extend_brk() is gone already at that point.
Thanks,
tglx
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