Re: [patch 2/3] lsm: add bsdjail module

Herbert Poetzl
2004-10-12T06:55:11Z

On Mon, Oct 11, 2004 at 02:47:29PM +0100, Alan Cox wrote:
> On Sul, 2004-10-10 at 11:41, Christoph Hellwig wrote:
> > Your filesystem handling code is completely superflous (and buggy). Please
> > remove all the code dealing with chroot-lookalikes. In your userland script
> > you simpl have to clone(.., CLONE_NEWNS) to detach your namespace from your
> > parent, then you can lazly unmount all filesystems and setup your new namespace
> > before starting the jail. The added advantage is that you don't need any
> > cludges to keep the user from exiting the chroot.
>
> AF_UNIX socket and fchdir().
>
> That however requires a co-operator outside the chroot so doesn't seem
> to be a problem. I like the CLONE approach, its a lot cleaner.

and it works well, because we use it for almost
a year now on linux-vserver ;)

best,
Herbert

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