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    SubjectRe: [patch] kernel sysfs events layer
    On Thu, Sep 16, 2004 at 08:08:05AM -0700, Greg KH wrote:
    > On Thu, Sep 16, 2004 at 04:10:08PM +0200, Herbert Poetzl wrote:
    > > On Wed, Sep 15, 2004 at 09:08:21PM -0700, Greg KH wrote:
    > > > On Thu, Sep 16, 2004 at 03:21:04AM +0200, Herbert Poetzl wrote:
    > > > > On Wed, Sep 15, 2004 at 05:38:39PM -0400, Robert Love wrote:
    > > > > > On Wed, 2004-09-15 at 14:34 -0700, Tim Hockin wrote:
    > > > > >
    > > > > > > It's a can of worms, is what it is. And I'm not sure what a good fix
    > > > > > > would be. Would it just be enough to send a generic "mount-table changed"
    > > > > > > event, and let userspace figure out the rest?
    > > > > >
    > > > > > "Can of worms" is a tough description for something that there is no
    > > > > > practical security issue for, just a lot of hand waving. No one even
    > > > > > uses name spaces.
    > > > >
    > > > > ah, sorry, that is wrong, we (linux-vserver)
    > > > > _do_ use namespaces extensively, and probably
    > > > > other 'jail' solutions will use it too ...
    > > >
    > > > Great.
    > > > So, how do you handle the /sbin/hotplug call today?
    > >
    > > most of the time, not at all, but if, then in the
    > > 'initial' namespace where other userspace helpers
    > > are handled too (means on the host)
    >
    > Ok, then you could handle the kevent message the same way, right?

    yes probably ...

    > > > How would you want to handle this kevent notifier?
    > >
    > > if there was a notifier telling about mounts - real
    > > and virtual - then they would make sense _inside_
    > > the respective namespace they happen .. e.g.
    > >
    > > usb-device attached:
    > > helper is called on host, and does some stuff
    > > result is a mount of some device, which happens
    > > on the host/initial namespace, notifier happens
    > > there ...
    > >
    > > process in namespace does --bind mount:
    > > this might be interesting for the host too, but
    > > probably it is more useful for the namespace
    > > where it happened ...
    >
    > But in which namespace did it happen? That's probaby the hard part to
    > determine, right?

    well, in the mount --bind case, not really, because
    the current process already identifies a namespace
    which could be used for that ...

    best,
    Herbert

    > thanks,
    >
    > greg k-h
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