[Bug 255514] etcupdate cleared the executable bit from /etc/rc.d/netif when resolving conflicts

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255514

            Bug ID: 255514
           Summary: etcupdate cleared the executable bit from
                    /etc/rc.d/netif when resolving conflicts
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: conf
          Assignee: bugs at FreeBSD.org
          Reporter: uqs at FreeBSD.org

Hi,

this basically bricked a remote system (luckily I had OOB access).

First, freebsd-update bricked the update to 13 as it copied a half kernel over
but the modules failed to load due to version symbol mismatch (what?). Then I
did the regular kernel/world build and install, followed by etcupdate.

I have a sleep in /etc/rc.d/netif (phys link takes too long to come up),
etcupdate entered the EDITOR to fix up the conflict, then I marked as resolved.

Rebooted and:

Starting devd.
eval: /etc/rc.d/netif: Permission denied
em1: link state changed to UP
debugnet_any_ifnet_update: Bad dn_init result from em1 (ifp
0xfffff80003c98000), ignoring.
eval: /etc/rc.d/netif: Permission denied
route: writing to routing socket: Network is unreachable
add net default: gateway 185.95.219.48 fib 0: Network is unreachable
Autoloading module: ichsmb.ko
eval: /etc/rc.d/netif: Permission denied


Dafuq?

root at acme:~# ls -l /etc/rc.d/net*
-rw-r--r--  1 root  wheel  5995 Apr 30 14:42 /etc/rc.d/netif
-r-xr-xr-x  1 root  wheel  2774 Jan  6 16:52 /etc/rc.d/netoptions
-r-xr-xr-x  1 root  wheel  3067 Jan  6 16:52 /etc/rc.d/netwait

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