[Bug 259968] ASLR by default tracking PR

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 21 Nov 2021 16:02:24 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259968

            Bug ID: 259968
           Summary: ASLR by default tracking PR
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

ASLR is enabled by default for 64-bit images, as of

commit b014e0f15bc73d80ef49b64fd1f8c29f469467cb
Author: Marcin Wojtas <mw@FreeBSD.org>
Date:   Sun Oct 24 16:53:06 2021 +0200

    Enable ASLR by default for 64-bit executables

This PR is open to track issues related to ASLR, with some initially reported
by lwhsu on freebsd-current:

> Thanks very much for working on this. FYI, there are some test cases
> seem to be affected by this:
>
> https://ci.freebsd.org/job/FreeBSD-main-amd64-test/19828/testReport/

I fixed the mkimg test failures in:

commit 036af1053acd6cae68c5fb6bed30508f2e40be13
Author: Ed Maste <emaste@FreeBSD.org>
Date:   Sat Nov 20 19:29:11 2021 -0500

    mkimg: zero entry in vhdx_write_metadata

    Otherwise _reserved might contain uninitialized data.

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