Re: sys_chroot+sys_fchdir Fix

[Bill Davidsen]

Alan Cox wrote:
> On Wed, 19 Sep 2007 09:19:50 +0200
> majkls <majkls@xxxxxxxxxxx> wrote:
>
> > Hello,
> > here is an fix to an exploit (obtained somewhere in internet). This 
> > exploit can workaround chroot with CAP_SYS_CHROOT. It is also possible 
> > (with sufficient filedescriptor (if there is na directory fd opened in 
> > root) workaround chroot with sys_fchdir. This patch fixes it.
>
>
> If you have the ability to use chroot() you are root. If you are root you
> can walk happily out of any chroot by a thousand other means.
I thought this was to prevent breaking out of chroot as a normal user.
	ie. chroot /var/myjail /bin/su - guest
or similar.

--
Bill Davidsen <davidsen@xxxxxxx>
  "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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