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This question already has an answer here:

I am using OpenSSH chrootdirectory feature to give access to a user via ssh.

Can this user exit the jail and return to the normal OS environment? Maybe with su?

marked as duplicate by Gilles, jasonwryan, John WH Smith, Celada, slm Mar 4 '15 at 2:20

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If the user does not have root access (or any way to gain it, such as exploiting an insecure setuid program), escaping a chroot jail should be impossible.

With root access, escaping a chroot jail is trivial. In fact, the chroot(2) manpage even gives instructions:

This call does not change the current working directory, so that after the call '.' can be outside the tree rooted at '/'. In particular, the superuser can escape from a "chroot jail" by doing:

   mkdir foo; chroot foo; cd ..
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No it cannot, it would give them an error. That's the whole point of chroot. They'll be only locked up in a location without being able to go out that location. But if you want tias.

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