Re: Blocking write access to /dev/kmem

[Ted U <grendel@heorot.stanford.edu>]

On Tue, 11 Jun 2002, Luis J. M. wrote:

>   My apologizes for my last mail, I didn't specified what I was looking
> for enough. What I'm searching is the code that locks /dev/kmem, not
> how to block /dev/kmem.

That device is governed by the sys/arch/i386/i386/mem.c file.  If you look
at the memopen() function, it keeps track of whether or not it wants to be
opened.



>
> > [tech is not the place to ask this kind of question, misc is.  You
> > should read the openbsd web site, especiallly about the mailing
> > lists.]
> (from http://www.openbsd.org/mail.html)
> tech
> Technical topics for OpenBSD developers and advanced users.
> Please direct 'new user' and installation-related questions to misc.
>
>   Do you think it was a newbie question?
>
> > Do an ls -l on those devices, for starters.  That will tell you something
> > Also, do a man mem for more information, which will lead you other
> > places, like securelevel(7).  That will give you a better picture of
> > whats going on.
> >
> > Remember that the man pages on OpenBSD are really good, and
> > random "man whatever" or "apropos whatever" can lead to very
> > interesting reading.....
>
>   What makes you think I didn't read the man pages?
>
>
> > --STeve Andre'
> >
> > On Tuesday 11 June 2002 16:58, Luis J. M. wrote:
> > > I've been looking for how OpenBSD blocks the writing access for /dev/km
> > em
> > > and /dev/mem unsuccessfully and I'd be interested in know how it's done
> > .
> > > Does anyone knows how?
> >
>
>

--
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You can be sure they'll chop off the arm.
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