Rooting FreeBSD , Privilege Escalation using Jails (P??????tur)

[Bakul Shah]

On Tue, 10 May 2011 19:24:28 +0200 =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des at des.no>  wrote:
> I vote no as well, but for a different reason: there are many other
> things the jailed root can do to the root directory, including flags,
> extended attributes, etc. (some of which are fs-dependent), and it would
> be difficult or impossible to identify all of them, not to mention those
> that aren't yet possible but will be in the future.  Fixing just one (or
> two, or five) of them today might give users a false sense of security,
> which is inexcusable when we can give a *true* sense of security by
> telling them to "chmod 0700 $D/..".

Dumb question: the jail command can refuse to run unless the
parent of a jail root is 0700. Would that work? No kernel hack
required.