This does not help. Let's try:
chroot somewhere
mkdir foo
fd = open /
chroot foo
('fd' implicitly closed and chdir to /foo)
Really? Try it. I am sure, that this works. You can create directory in
chroot and break chroot by this. fd is not closed, because linux doesn't
close descriptors by chroot syscall. this can be done every time if you
have CAP_SYS_CHROOT.
fchdir fd
-EINVAL
chdir ".."
/../ => /
....
chdir ".."
chroot "."
so you are in root.
so we remain in chroot.
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