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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