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

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Message-Id: <20131104104152.72F91E0090@blue.fi.intel.com>
Date:	Mon,  4 Nov 2013 12:41:52 +0200 (EET)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>
Subject: RE: [PATCH] x86, mm: get ASLR work for hugetlb mappings

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@...ux.intel.com>
> Cc: Matthew Wilcox <willy@...ux.intel.com>

Andrew, any comments?

-- 
 Kirill A. Shutemov
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