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    SubjectRe: Really good idea to allow mmap(0, FIXED)?
    Hi!
    >
    > > > 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.

    Just add some magic constant on architectures you care about... make
    user 0 start at 4mb in kernel... and you get your security hardened
    kernel w/o breaking dosemu. All you need is to create a patch :-)


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