Subject: Re: kcopy()
To: Andrew Brown <firstname.lastname@example.org>
From: Jaromir Dolecek <jdolecek@NetBSD.org>
Date: 12/21/2003 09:23:35
Is it just me, or does interface to read arbitrary kernel memory
location using sysctl() sound really broken?
Andrew Brown wrote:
> >> i've got two pointers.
> >> one may or may not be a valid kernel pointer. i can't tell.
> >> the other may be a pointer into userspace or a pointer into kernel
> >> space. i can tell which kind it is, and if it's the latter, i'm
> >> perfectly willing to assume that it's valid.
> >I give up. How can you tell if a pointer is to userspace or kernel
> oh, because i have a third pointer (to a struct lwp) that will be null
> (or not null) if the second pointer is into kernel space (or user
> |-----< "CODE WARRIOR" >-----|
> email@example.com * "ah! i see you have the internet
> firstname.lastname@example.org (Andrew Brown) that goes *ping*!"
> email@example.com * "information is power -- share the wealth."
Jaromir Dolecek <jdolecek@NetBSD.org> http://www.NetBSD.cz/
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