Date: Sat, 15 Jul 2000 21:14:17 -0400 (EDT) From: Brian Fundakowski Feldman <green@FreeBSD.org> To: Warner Losh <imp@village.org> Cc: freebsd-arch@FreeBSD.org Subject: Re: SysctlFS Message-ID: <Pine.BSF.4.21.0007152020060.877-100000@green.dyndns.org> In-Reply-To: <200007152343.RAA49544@harmony.village.org>
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On Sat, 15 Jul 2000, Warner Losh wrote: > In message <Pine.BSF.4.21.0007151907310.877-100000@green.dyndns.org> Brian Fundakowski Feldman writes: > : On Sat, 15 Jul 2000, Robert Watson wrote: > : > : > On Sat, 15 Jul 2000, Brian Fundakowski Feldman wrote: > : > > : > > We could create a way for jailed processes to "break out" into the > : > > canonical name space. This is a description of possible semantics for > : > > : > What canonical namespace would that be? > : > : Unless you can think of anything else that could possibly be the > : canonical namespace, struct vnode *rootvnode. > > Put another way... > > If we have a jail that lives in /foo/bar, and we have ways to > symboliclly link outside /foo/bar, that's a big problem. Why? It's got exactly the same considerations as the "true" root being able to mount(2) things into a jail or mknod(2). > Also, you really don't want too many devices in a jail's /dev tree. > You really wouldn't want devfs for jail unless you could limit it > severely. And that's going to be hard to write, I think. But you could create multiple mounts (instances) of devfs which each contain a specific subset of the devfs proper and do the "symlink breakout" accordingly :) An aspect of jail classes, if you will. > Warner -- Brian Fundakowski Feldman \ FreeBSD: The Power to Serve! / green@FreeBSD.org `------------------------------' To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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