linux-kernel - Re: Chroot bug

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Message-ID: <Pine.LNX.4.64.0709251746200.945@fbirervta.pbzchgretzou.qr>
Date:	Tue, 25 Sep 2007 17:47:38 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	David Newall <david@...idnewall.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Bill Davidsen <davidsen@....com>,
	Philipp Marek <philipp@...ek.priv.at>, 7eggert@....de,
	majkls <majkls@...pere.com>, bunk@...tum.de,
	linux-kernel@...r.kernel.org
Subject: Re: Chroot bug


On Sep 25 2007 16:48, Alan Cox wrote:
>David Newall <david@...idnewall.com> wrote:
>> Alan Cox wrote:
>>>>
>>>> Marek's loading dynamic libraries, it seems clear that the prime
>>>> purpose of chroot is to aid security.  Being able to cd your way
>>>> out is handy
>>>
>>> Does it - I can't find any evidence for that.
>>
>> It seems self-evident to me.  What do you think is it prime purpose?
>
>Debugging and testing. At least that is as I understand it much of where
>it came from.
>
>>> A root user can get out of a chroot a million different ways

Uhm, you _do_ have considered the case of setuid(non-0)-after-chroot,
have not you?
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