Re: [RCF] [PATCH] unprivileged mount/umount

[Miklos Szeredi]

> Still easy.
> 
> To keep persistent named namespaces in /var/namespaces, thus:
> 
>      # Just once please!
>      mount -t tmpfs none /var/namespaces
> 
>      # Make a named namespace.
>      NSNAME='fred'
>      mkdir /var/namespaces/$NSNAME
>      run_in_new_namespace mount -t bind / /var/namespaces/$NSNAME

That's not going to work, since the mount will only affect the new
namespace.  You'd need clone(), and then in the original namespace

   mount --bind /proc/CHILDPID/root /var/namespace/$NSNAME

and then child process can safely exit.

Miklos
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