bin/55815: tar opens device files

[martin%NetBSd.org@localhost]

>Number:         55815
>Category:       bin
>Synopsis:       tar opens device files
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 22 13:25:00 +0000 2020
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.75
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD seven-days-to-the-wolves.aprisoft.de 9.99.75 NetBSD 9.99.75 (GENERIC) #425: Wed Nov 4 15:34:33 CET 2020 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:

Tar does open device files, which is a *very* bad idea.

>How-To-Repeat:

ktrace tar cvf - /dev >/dev/null
(but carefull, might kill your machine)

>Fix:
Switch MKBSDTAR back to off.