Re: hardened chroot()

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Shaya Potter wrote:

>> Majkls wrote:
>>
>
>>>> Hello,
>>>> is there possibility to add hardened chroot() to linux kernel? I have
>>>> some patch and I would like submit it into linux-kernel. Now can be
>>>> chroot workarounded. What do you think about it?
>
>>
>>
>> I wrote one a few years ago, but there seemed to be no interest in it.
>>
>> My conception was based on that observation that a chroot "point" really
>> only deals with path walking and basically says that at this point ".."
>> is the same as ".".  Therefore, all we need are a linked list of "chroot
>> points" and just like the current follow_dotdot() function tests if the
>> current directory is the "root", one can just have it loop through the
>> entire list of chroot points.

yes i have special function which check if is it in root. It is also
necessary fix sys_fchdir.

>>
>> The idea was to enable root processes to run within a chroot
>> environment, and even call chroot().
>>
>> In Linux today, it might be better solved via setting up an alternative
>> namespace.

yes, but it is not so simple. simplier is one patch for chroot. Why
don't do it right, if it is not problem.

>>
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-- 
Miloslav "Majkls" Semler
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