[Devel] Re: [patch 0/8] unprivileged mount syscall

[Jan Engelhardt]

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.

Regards,
Jan
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