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

From: Kirill A. Shutemov
Date: Mon Nov 04 2013 - 05:42:02 EST

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?

Kirill A. Shutemov
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