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SubjectRe: [PATCHv2 1/2] x86/mm: Do not allow non-MAP_FIXED mapping across DEFAULT_MAP_WINDOW border
On Tue, Nov 14, 2017 at 05:01:50PM +0100, Thomas Gleixner wrote:
> @@ -198,11 +199,14 @@ arch_get_unmapped_area_topdown(struct fi
> /* requesting a specific address */
> if (addr) {
> addr = PAGE_ALIGN(addr);
> + if (!mmap_address_hint_valid(addr, len))
> + goto get_unmapped_area;
> +

Here and in hugetlb_get_unmapped_area(), we should align the addr after
the check, not before. Otherwise the alignment itself can bring us over
the borderline as we align up.

--
Kirill A. Shutemov

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