Re: RFC: Multiple instances of kernel namespaces.

[Herbert Poetzl]

On Thu, Jan 26, 2006 at 01:13:45PM -0700, Eric W. Biederman wrote:
> Herbert Poetzl <herbert@xxxxxxxxxxxx> writes:
> 
> > On Sat, Jan 21, 2006 at 03:04:16AM -0700, Eric W. Biederman wrote:
> >> So in the simple case I have names like:
> >> 1178/1632
> >
> > which is a new namespace in itself, but it doesn't matter
> > as long as it uniquely and persistently identifies the
> > namespace for the time it exists ... just leaves the
> > question how to retrieve a list of all namespaces :)
> 
> Yes but the name of the namespace is still in the original pid namespace.
> And more importantly to me it isn't a new kind of namespace.
> 
> >> If I want a guest that can keep secrets from the host sysadmin I don't
> >> want transitioning into a guest namespace to come too easily.
> >
> > which can easily be achieved by 'marking' the namespace
> > as private and/or applying certain rules/checks to the
> > 'enter' procedure ...
> 
> Right.  The trick here is that you must be able to deny
> transitioning into a namespace from the inside the namespace.
> Or else a guest could never trust it.  Something one of my
> coworkers pointed out to me.

not necessarily, for example have a 'private' flag, which
can only be set once (usually from outside), ensuring that
the namespace will not be entered. this flag could be
checked from inside ...

best,
Herbert

> Eric
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