[Bug 265471] loader: /boot/lua/menu.lua boots kernel from original bootenv when bootenv is changed

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 27 Jul 2022 23:47:44 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265471

            Bug ID: 265471
           Summary: loader: /boot/lua/menu.lua boots kernel from original
                    bootenv when bootenv is changed
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: crahman@gmail.com

Created attachment 235516
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=235516&action=edit
Unload any previously loaded kernel when changing boot environment.

Related to a bug fixed by Kyle Evans <kevans@FreeBSD.org> in commit
e414851f3eb7a9dd2af8209eac4ada307cb6ff8e, if a password is set for the loader,
when the boot environment is changed in the lua menu, the kernel originally
loaded before the menu was brought up is booted in the new boot environment.

Since the kernel directory isn't mounted, this prevents modules from being
loaded during boot.  In addition, if the reason for using the boot environment
is to provide a known good kernel and environment, well...

I've attached a patch.

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