On Sep 25 2007 18:19, Miloslav Semler wrote:
>> > > 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
('fd' implicitly closed and chdir to /foo)
> fchdir fd
-EINVAL
> chdir ".."
/../ => /
> ....
> chdir ".."
> chroot "."
> so you are in root.
so we remain in chroot.
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