Re: bug in write(2) system call.
Scott Wood (master@darkflame.ml.org)
Mon, 19 Oct 1998 20:46:23 -0400 (EDT)
Philip Blundell <pb@nexus.co.uk> wrote:
>
> > So we should avoid checking any pointers, whatsoever, and just go
> >for it?
>
> Yes; this is why we have the MMU to do permission checking. If you have a bad
> pointer an exception will be raised and the kernel just has to handle it
> appropriately.
And what if the user program passes a pointer that is valid for the
kernel to dereference (hence the MMU triggers no exception), but is not
something userland code should be able to touch?
-Scott
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