linux-kernel - Re: Chroot bug

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Message-ID: <46F9431C.6020202@prepere.com>
Date:	Tue, 25 Sep 2007 19:19:24 +0200
From:	Miloslav Semler <majkls@...pere.com>
To:	Al Viro <viro@....linux.org.uk>
CC:	Jan Engelhardt <jengelh@...putergmbh.de>, serge@...lyn.com,
	davidsen@....com, philipp@...ek.priv.at, 7eggert@....de,
	alan@...rguk.ukuu.org.uk, linux-kernel@...r.kernel.org
Subject: Re: Chroot bug


> On Tue, Sep 25, 2007 at 07:05:06PM +0200, Jan Engelhardt wrote:
>
>   
>> Perhaps that was formulated a bit sloppy. It of course means
>> "On chroot(2), implicitly close all FDs that point outside."
>>     
>
> Bollocks.  Pack 'em into SCM_RIGHTS datagram, send to yourself,
> do chroot, recvmsg() and move on, cheerfully spitting at the
> YAidiotic "hardening".
>   
so if you check sanity in fchdir (if directory_is_out), your method will 
not succeed :)
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