Re: Security fix for remapping of page 0 (was [PATCH] ChangeZERO_SIZE_PTR to point at unmapped space)

[Linus Torvalds]

On Wed, 3 Jun 2009, Christoph Lameter wrote:
> 
> mmap_min_addr depends on CONFIG_SECURITY which establishes various
> strangely complex "security models".
> 
> The system needs to be secure by default.

It _is_ secure by default. You have to do some pretty non-default things 
to get away from it.

But I do agree that it might be good to move the thing into the generic 
path. I just don't think your arguments are very good. It's not about 
defaults, it's about the fact that this isn't worth being hidden by that 
security layer.

			Linus
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