linux-kernel - Re: [PATCH v5] RO/NX protection for loadable kernel modules

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Message-Id: <200907130851.56161.rusty@rustcorp.com.au>
Date:	Mon, 13 Jul 2009 08:51:55 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Siarhei Liakh <sliakh.lkml@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@....de>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-cris-kernel@...s.com
Subject: Re: [PATCH v5] RO/NX protection for loadable kernel modules

On Mon, 13 Jul 2009 01:02:27 am Arjan van de Ven wrote:
> Rusty Russell <rusty@...tcorp.com.au> wrote:
> > Yes, maybe that's better than kmalloc.  On my laptop I have 105
> > modules loaded, with 3778464 total length: I'm wasting 206944 bytes
> > on unused tails of pages.  But that's only 0.06% of my memory.
>
> 105 is also a sign that you picked a somewhat suboptimal config...
> that's of course your choice but it's a choice that has a small price,
> if you don't want to pay that price, changing the config to not be
> entirely insane is a good answer as well ;-)

To be clear: I run distro kernels on my laptop (Ubuntu in this case).  I think 
this is what we should be optimizing for, or we should offer the distros 
something better than modules.

Cheers,
Rusty.




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