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

[Alan Cox]

> It defaults to 64kB in at least the x86 defconfig files, but to 0 in the 
> Kconfig defaults. Also, for some reason it has a "depends on SECURITY", 
> which means that if you just default to the old-style unix security you'll 
> lose it.
> 
> So there are several ways to disable it by mistake. I don't know what 
> distros do.

Fedora at least uses SELinux to manage it. You need some kind of security
policy engine running as a few apps really need to map low space (mostly
for vm86)

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