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

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Message-Id: <20131104130951.44c20ed3d29395a3da57ad46@linux-foundation.org>
Date:	Mon, 4 Nov 2013 13:09:51 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
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,
	Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [PATCH] x86, mm: get ASLR work for hugetlb mappings

On Mon,  4 Nov 2013 12:41:52 +0200 (EET) "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> 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@...ux.intel.com>
> > Cc: Matthew Wilcox <willy@...ux.intel.com>
> 
> 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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