Re: UVM and the NULL page

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Fri, Jul 29, 2016 at 10:08:48AM +0200, Maxime Villard wrote:
> It is not possible to keep a sysctl, since VM_MIN_ADDRESS is a constant
> used in assembly, so it won't be turned to a variable.

So find a different solution to fix the bugs.

> 
> Now, it is a little hard to know how many emulators or whatever rely on
> null to be available. But many (most?) systems don't allow null nowadays,
> and null dereferences are a well-known issue. It is more or less becoming
> a standard. If a software fails on NetBSD because of a null mmap, then it
> is likely to fail on many other systems.

Just because many newer ("hardened") systems break compatibility with
existing programs doesn't justify the same to be done to NetBSD.

> 
> I will commit [3] soon.

I strongly object that.

Joerg