Date: Tue, 19 Dec 2000 12:19:01 -0800 From: "Crist J. Clark" <cjclark@reflexnet.net> To: Alfred Perlstein <bright@wintelcom.net> Cc: freebsd-security@FreeBSD.ORG Subject: Re: Read-Only Filesystems Message-ID: <20001219121901.C23819@rfx-64-6-211-149.users.reflexco> In-Reply-To: <20001219120953.S19572@fw.wintelcom.net>; from bright@wintelcom.net on Tue, Dec 19, 2000 at 12:09:53PM -0800 References: <20001219114936.A23819@rfx-64-6-211-149.users.reflexco> <20001219120953.S19572@fw.wintelcom.net>
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On Tue, Dec 19, 2000 at 12:09:53PM -0800, Alfred Perlstein wrote:
> * Crist J. Clark <cjclark@reflexnet.net> [001219 11:50] wrote:
> > I was recently playing around with the idea of having a read-only root
> > filesystem. However, it has become clear that there is no way to
> > prevent root from changing the mount properties on any filesystem,
> > including the root filesystem, provided there is no hardware-level
> > block on writing and there is someplace (anyplace) where root can
> > write.
> >
> > Is that accurate? I guess one must go to a "trusted OS" to get that
> > type of functionality?
>
> You can trust freebsd. :)
>
> do some research on "securelevel"
I am familiar with securelevel. Are you suggesting,
# find -x / -exec chflags schg {} \;
--
Crist J. Clark cjclark@alum.mit.edu
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