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Date: Tue, 25 Sep 2007 17:43:58 +0200
From: Miloslav Semler <majkls@...pere.com>
To: Adrian Bunk <bunk@...nel.org>
CC: 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
Adrian Bunk napsal(a):
> On Wed, Sep 26, 2007 at 12:40:27AM +0930, David Newall wrote:
>
>
>> Miloslav Semler pointed out that a root process can chdir("..") out of its
>> chroot. Although this is documented in the man page, it conflicts with the
>> essential function, which is to change the root directory of the process.
>> In addition to any creative uses, for example Philipp 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 for the bad guys, but
>> the good guys don't need it; there are a thousand better, safer solutions.
>> ...
>>
>
> The bad guys most likely also now other tricks to escape the chroot.
>
> If you are root in the chroot you can e.g. mount the partition with the
> root filesystem inside the chroot.
>
> If a bad guy becomes root inside a chroot it's game over.
>
but why there keep 1000001th. It is same as:
There is milion ways howto dos your system.. Then we needn't repair bugs...
> cu
> Adrian
>
>
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