linux-kernel - Re: Chroot bug

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Message-ID: <46FA71E0.8080406@prepere.com>
Date:	Wed, 26 Sep 2007 16:51:12 +0200
From:	Miloslav Semler <majkls@...pere.com>
To:	Al Viro <viro@....linux.org.uk>
CC:	Kyle Moffett <mrmacman_g4@....com>,
	David Newall <david@...idnewall.com>,
	Adrian Bunk <bunk@...nel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Bill Davidsen <davidsen@....com>,
	Philipp Marek <philipp@...ek.priv.at>, 7eggert@....de,
	bunk@...tum.de, linux-kernel@...r.kernel.org
Subject: Re: Chroot bug

Al Viro napsal(a):
> On Wed, Sep 26, 2007 at 03:11:33PM +0200, Miloslav Semler wrote:
>   
>>> As for the nested-chroot() bit, the root user inside of a chroot is 
>>> always allowed to chroot().  This is necessary for test-suites for 
>>> various distro installers, chroot once to enter the installer playpen, 
>>> installer chroots again to configure the test-installed-system.  Once 
>>> you allow a second chroot, you're back at the "can't reliably and 
>>> efficiently track directory sub-tree members" problem.
>>>
>>> So if you think it can and should be fixed, then PROVIDE THE CODE.
>>>       
>> Miloslav Semler
>>     
>
> man openat
>
> This is really pointless, anyway - any code that expects chroot to be
> root-proof is terminally broken.
>   
So thanks for information. I did't know anything about *at functions. So 
it seems to be more complicated. But maybe it will be good write to 
manpage "other systems implement it by other way, so this feature is 
unportable".
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