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SubjectRe: Really good idea to allow mmap(0, FIXED)?
Date
On Thursday 05 October 2006 23:58, Alan Cox wrote:
> Ar Iau, 2006-10-05 am 20:59 +0200, ysgrifennodd Michael Buesch:
> > Is is really a good idea to allow processes to remap something
> > to address 0?
>
> It is very useful indeed. Consider for example dosemu.

Ok, good point.

> > Besides that, I currently don't see a valid reason to mmap address 0.
> >
> > Comments?
>
> User zero is not neccessarily mapped at kernel zero so your argument
> isn't portable either.

Eh, so what about the following.
We _have_ arches which map user zero to kernel zero. What about
specialcasing that on a per-arch case. So remapping user zero to
something else in kernel.

--
Greetings Michael.
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