Re: [PATCH v4] kptr_restrict for hiding kernel pointers

[Ingo Molnar]

* Dan Rosenberg <drosenberg@xxxxxxxxxxxxx> wrote:

> 
> > 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.

Some specific objections would be needed - which might arrive if the default is 
changed to on.

> As far as I know, there's no actual breakage of anything in userspace,
> but there's a general "it might make it harder to debug things in
> certain limited circumstances" sentiment among some.  I never understood
> why it is necessary for unprivileged users to be able to debug the
> kernel.
> 
> Does anyone else have thoughts on this?

Well, lets just enable it by default and let others argue for less security, hm?

Thanks,

	Ingo
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