Date: Wed, 25 Jun 2003 18:52:33 +0400 From: Dmitry Sivachenko <demon@freebsd.org> To: Pawel Jakub Dawidek <nick@garage.freebsd.pl> Cc: freebsd-arch@freebsd.org Subject: Re: Jailed sysvipc implementation. Message-ID: <20030625145233.GA28322@fling-wing.demos.su> In-Reply-To: <20030625144849.GJ7587@garage.freebsd.pl> References: <20030624164602.GW7587@garage.freebsd.pl> <20030625135106.GA19868@fling-wing.demos.su> <20030625140518.GA23435@fling-wing.demos.su> <20030625144849.GJ7587@garage.freebsd.pl>
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On Wed, Jun 25, 2003 at 04:48:49PM +0200, Pawel Jakub Dawidek wrote: > On Wed, Jun 25, 2003 at 06:05:18PM +0400, Dmitry Sivachenko wrote: > +> > > Some time ago I've implemented private memory zones for IPC mechism. > +> > > Every jail and main host got its own memory for IPC operations. > +> > > It was implemented for FreeBSD 4.x. Avaliable at: > +> > > > +> > > http://garage.freebsd.pl/privipc.tbz > +> > > http://garage.freebsd.pl/privipc.README > +> > > +> > I think it would be better to add checks to disallow the use of IPC > +> > primitives created in one jail from another. > +> > Thus we will avoid allocating separate segments of kernel memory for > +> > each jail. > +> > > +> > It could be trivially achieved by adding another field to struct ipc_perm, > +> > but Robert Watson said he knows another way of doing this without > +> > breaking ABI (if I understood him right). > +> > > +> > +> Please look at his patch: > +> > +> http://www.watson.org/~robert/freebsd/mac_sysvipc.diff > +> > +> It does slightly different things, but we could borrow from it. > > But you got still *one* memory zones for every jail and main host. Yes, that is exactly what I want. This is similar to separate IP stack for each jail: this is more powerful solution, but more expensive (uses more kernel memory). Jail is not a true virtual machine. Let's keep it a *light* virtual machine replacement, with single IP stack, one memory zones for all jails and host, etc. > And I want to separate them. > Then you should join Marco Zec and contribute to his project. Jail will hardly become a true virtual machine.
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