[Bug 211246] [syscons] console and ttyv0 competing for keystrokes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211246

            Bug ID: 211246
           Summary: [syscons] console and ttyv0 competing for keystrokes
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: alexander.klein at physiologie.med.uni-giessen.de
                CC: freebsd-i386 at FreeBSD.org
                CC: freebsd-i386 at FreeBSD.org

On my system, ttyv0 and console are competing for keystrokes on the
ttyv0-screen. This can be seen when logging in under X, immediately issuing

% xconsole -file /dev/console

in an xterm, switching to ttyv0 by pressing Ctrl+Alt+F1, and then typing some
text.

In most cases, the typed text will appear in the Xconsole-window, and even if
this doesn't happen immediately, hammering the keys fast enough with a few
<Ret>s interspersed will usually make at least some characters appear in the
Xconsole-window.

This might have security implications when parts of login credentials are
redirected.

As an aside, things written to /dev/console invariably appear on the
ttyv0-screen on my system, but are never passed on to xconsole.

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