linux-kernel - Re: missing madvise functionality

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Message-ID: <4612C722.1000006@redhat.com>
Date:	Tue, 03 Apr 2007 17:29:06 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Eric Dumazet <dada1@...mosbay.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jakub Jelinek <jakub@...hat.com>, linux-mm@...ck.org,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: missing madvise functionality

Jeremy Fitzhardinge wrote:
> Eric Dumazet wrote:
>> mmap()/brk() must give fresh NULL pages, but maybe
>> madvise(MADV_DONTNEED) can relax this requirement (if the pages were
>> reclaimed, then a page fault could bring a new page with random content) 
> 
> Only if those pages were originally from that process.  Otherwise you've
> got a bit of an information leak there.

Or from another process by the same user, in the same security
context.  That gets a bit more complex though :)

-- 
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