K 10
svn:author
V 5
jamie
K 8
svn:date
V 27
2021-02-22T19:08:27.050230Z
K 7
svn:log
V 603
MFC jail: Change both root and working directories in jail_attach(2)

jail_attach(2) performs an internal chroot operation, leaving it up to
the calling process to assure the working directory is inside the jail.

Add a matching internal chdir operation to the jail's root.  Also
ignore kern.chroot_allow_open_directories, and always disallow the
operation if there are any directory descriptors open.

Reported by:    mjg
Approved by:    markj, kib

(cherry picked from commit d4380c0cdd0517dc038403dd5c99242ce78bdeb5)

Git Hash:   570121808a76b85b2709502fb15618dd1e5296f1
Git Author: jamie@FreeBSD.org
END