On 4/6/07, H. Peter Anvin <[EMAIL PROTECTED]> wrote:
> Jan Engelhardt wrote:
> > On Apr 6 2007 16:16, H. Peter Anvin wrote:
> >>>> - users can use bind mounts without having to pre-configure them in
> >>>> /etc/fstab
> >>>>
> >> This is by far the biggest concern I see.  I think the security 
> >> implication of
> >> allowing anyone to do bind mounts are poorly understood.
> >
> > $ whoami
> > miklos
> > $ mount --bind / ~/down_under
> >
> > later that day:
> > # userdel -r miklos
> >
>
> Consider backups, for example.
>

This is the reason why enforcing private namespaces for user mounts
makes sense.  I think it catches many of these corner cases.

          -eric
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