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From: Jamie Landeg Jones <jamie@bishopston.net>
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Cc: freebsd-security@freebsd.org
Subject: Re: Rooting FreeBSD , Privilege Escalation using Jails (P??????tur)
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> It used to confuzzle sysadmins on SUNos when the mount point was
> 0700.  The underlying mode disapeared when the mount was made, but it
> was still being enforced. Suddenly no one but root could use say /usr
> even though it was apparently 0755

I remember that happening! I thought it was like that on FreeBSD too,
but if it was, it isn't any longer!

I always make mount-points 0111 these days