linux-kernel - Re: [RFC][PATCH 1/2] fs proc: make pagemap a privileged interface

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Message-ID: <878uf5rb3v.fsf@x220.int.ebiederm.org>
Date:	Mon, 09 Mar 2015 18:43:00 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Kees Cook <keescook@...omium.org>
Cc:	Dave Hansen <dave@...1.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Theodore Ts'o" <tytso@....edu>, Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [RFC][PATCH 1/2] fs proc: make pagemap a privileged interface

A 1 to 1 blinding function like integer multiplication mudulo 2^32 by an
appropriate random number ought to keep from revealing page numbers or
page ajacencies while not requiring any changes in userspace.

That way the revealed pfn and the physcial pfn would be different but
you could still use pagemap for it's intended purpose.

Eric
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