Re: Chroot bug

[Miloslav Semler <majkls@prepere.com>]

> > > So what? Just do this: chdir into the root after chroot.
> > >       
> > I don't think so.  His exploit just got me all the way out of a chroot within a
> > chroot within a chroot, inclusive of lots of chdirs.
> >     
>
> Close all fds that point to directories outside the root ;-)
>
>   
This  does not help.  Let's try:
chroot somewhere
mkdir foo
fd = open /
chroot foo
fchdir fd
chdir ".."
....
chdir ".."
chroot "."
so you are in root.


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