Re: UVM and the NULL page

[Eduardo Horvath <eeh%NetBSD.org@localhost>]

On Thu, 28 Jul 2016, Maxime Villard wrote:

> Currently, there is no real way to make sure a userland process won't be
> able to allocate the NULL page. There is this attempt [1], but it has two
> major issues.

I don't think this is a good idea.  You should leave this to the pmap 
layer rather than polluting UVM.  There are some architectures that need 
to have page zero mapped in for various reasons.

Eduardo