On Thu, 2002-10-24 at 12:09, Henning P. Schmiedehausen wrote:
> Ville Herva <vherva@niksula.hut.fi> writes:
>
> >the /dev/kmem hole, but this closes 2 classes of attacks - loading rootkit
> >module and booting with a hacked kernel in straight-forward way.
>
> Question: What do I lose when you remove /dev/kmem?
> Related question: Would it be useful to make /dev/kmem read-only?
Makes no real difference. If the user got to root they can work the
chmod command. What you want to do is revoke CAP_SYS_RAWIO which kills
off all direct hardware access - mem/kmem/iopl/ioperm etc. It does stop
non kernel fb X working but thats not a big deal on a server.
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This archive was generated by hypermail 2b29 : Thu Oct 31 2002 - 22:00:23 EST