libjail: extend struct handlers to included MAC labels

MAC label handling is a little special; to avoid being too disruptive,
we allocate a `mac_t *` here for the value so that we can mac_prepare()
or mac_from_text() into.  As a result, we need:

 - A custom free() handler to avoid leaking the *jp_value
 - A custom jailparam_get() handler to mac_prepare() the mac_t and
    populate the iove properly, so that the kernel doesn't have to
    do something funky like copyin, dereference, copyin again.
 - A custom jailparam_set() handler to similarly populate the iovec
    properly.

Reviewed by:	jamie
Differential Revision:	https://reviews.freebsd.org/D53960

0 files changed, 0 insertions, 0 deletions