Re: [PATCH] x86, mm: get ASLR work for hugetlb mappings

From: Andrew Morton
Date: Mon Nov 04 2013 - 16:09:57 EST

On Mon, 4 Nov 2013 12:41:52 +0200 (EET) "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> wrote:

> Kirill A. Shutemov wrote:
> > Matthew noticed that hugetlb doesn't participate in ASLR on x86-64.
> > The reason is genereic hugetlb_get_unmapped_area() which is used on
> > x86-64. It doesn't support randomization and use bottom-up unmapped area
> > lookup, instead of usual top-down on x86-64.
> >
> > x86 has arch-specific hugetlb_get_unmapped_area(), but it's used only on
> > x86-32.
> >
> > Let's use arch-specific hugetlb_get_unmapped_area() on x86-64 too.
> > It fixes the issue and make hugetlb use top-down unmapped area lookup.
> >
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> > Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
> Andrew, any comments?

whome? I'm convinced, but it's an x86 patch. I tossed it in there so
it gets a bit of linux-next exposure.

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