Messages in this thread | | | Date | Sat, 7 Oct 2006 11:23:01 +0000 | From | Pavel Machek <> | Subject | Re: Really good idea to allow mmap(0, FIXED)? |
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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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