Re: [patch 0/8] unprivileged mount syscall

[H. Peter Anvin]

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
>
> So both the source (/) and target (~/down_under) directory must be owned 
> by the user before --bind may succeed.
>
> There may be other implications hpa might want to fill us in.

Consider backups, for example.

	-hpa
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