linux-kernel - Re: [Security] proactive defense: using read-only memory, RO/NX modules

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Message-ID: <20101108100342.61dde238@lxorguk.ukuu.org.uk>
Date:	Mon, 8 Nov 2010 10:03:42 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Kees Cook <kees.cook@...onical.com>,
	Siarhei Liakh <sliakh.lkml@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Security] proactive defense: using read-only memory, RO/NX
 modules

> Nice! IMHO we need more of that. (If the readonly section gets big enough in 
> practice we could perhaps even mark it large-page in the future. It could serve as 
> an allocator to module code as well - that would probably be a speedup even for 
> modules.)

You ideally want one other thing to go with it. While a non-guest can't
support it the marking of pages "permanently and irrevocably" readonly in
a guest is something a hypedvisor can happily enforce and provide for the
lifetime of the guest.

Alan
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