linux-kernel - Re: [PATCH v4] kptr_restrict for hiding kernel pointers

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Message-ID: <20101222162118.GC20358@elte.hu>
Date:	Wed, 22 Dec 2010 17:21:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Dan Rosenberg <drosenberg@...curity.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org, jmorris@...ei.org,
	tgraf@...radead.org, eugeneteo@...nel.org, kees.cook@...onical.com,
	davem@...emloft.net, a.p.zijlstra@...llo.nl,
	akpm@...ux-foundation.org, eparis@...isplace.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v4] kptr_restrict for hiding kernel pointers


* Eric Dumazet <eric.dumazet@...il.com> wrote:

> Le mercredi 22 décembre 2010 à 08:13 -0500, Dan Rosenberg a écrit :
> > > Hm, why is it off by default? Is there some user-space regression that is caused by 
> > > this?
> > > 
> > > We really want good security measures to be active by default (and to work by 
> > > default) - they are not worth much if they are not.
> > > 
> > 
> > I agree entirely, but I've received a lot of resistance to these types
> > of changes in net.  I'm afraid that if it's enabled by default, no one
> > will actually allow use of the %pK specifier where it should be used.
> > 
> 
> Actually, "net resistance" was against your first patches, using quick
> and dirty techniques (Should I remind you some of them ?)
> 
> Now you have a helper, it should be easier to integrate the changes.

Great - if the concept itself wasnt objected to then i think we should flip the 
default to on.

Thanks,

	Ingo
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