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From: Edho P Arief <edhoprima@gmail.com>
Date: Sun, 8 May 2011 14:55:55 +0700
Message-ID: <BANLkTim2cpR0NtA+ALW3bjt_d7vw8gAV1Q@mail.gmail.com>
To: Jason Hellenthal <jhell@dataix.net>
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Cc: Jamie Landeg Jones <jamie@bishopston.net>, freebsd-security@freebsd.org,
	feld@feld.me, utisoft@gmail.com
Subject: Re: Rooting FreeBSD , Privilege Escalation using Jails (P??????tur)
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On Sun, May 8, 2011 at 2:52 PM, Jason Hellenthal <jhell@dataix.net> wrote:
>
> Edho,
>
> It should also be noted here that the jailed root user also has permission
> to chmod(1) '/' to anything he or she wants unless you have taken
> precaution to not allow that. I would reccoment storing your jails two
> levels deep into a directory and chmod(1) 700 the first level to prevent
> access from the host and from the jailed root user changing the perms.
>

I indeed changed the permission above the jail's root. I usually make
it like this:

/jails/jailname/root

and I set 700 on /jails/jailname. It's been a long time but as I said
before I don't remember encountering permission problem in the jail.
Or perhaps I remembered it wrong.