Date: Tue, 19 Dec 2000 21:50:58 -0800 From: Alfred Perlstein <bright@wintelcom.net> To: Kris Kennaway <kris@FreeBSD.ORG> Cc: cjclark@alum.mit.edu, freebsd-security@FreeBSD.ORG Subject: Re: Read-Only Filesystems Message-ID: <20001219215057.F19572@fw.wintelcom.net> In-Reply-To: <20001219211642.D13474@citusc.usc.edu>; from kris@FreeBSD.ORG on Tue, Dec 19, 2000 at 09:16:42PM -0800 References: <20001219114936.A23819@rfx-64-6-211-149.users.reflexco> <20001219120953.S19572@fw.wintelcom.net> <20001219211642.D13474@citusc.usc.edu>
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* Kris Kennaway <kris@FreeBSD.ORG> [001219 21:15] wrote: > 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 don't believe mounting or remounting is denied by any securelevel..I > raised this a few months ago but the consensus seemed to be that > securelevel was too broken by design and the real fix was MAC, which > is coming with TrustedBSD. I don't see the problem with fixing securelevel in that aspect since the securelevel is raised late in the boot process, after the fs's are mounted. no? -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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