[Bug 231072] Mtree calculates checksum wrong when verifying a specification against a directory.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231072

            Bug ID: 231072
           Summary: Mtree calculates checksum wrong when verifying a
                    specification against a directory.
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: kpaasial at gmail.com

https://www.freebsd.org/doc/handbook/security-intro.html the mtree(8) example
at section 13.2.6 Binary Verification is not working correctly. The output from
the verification step is empty as expected but the checksum printed differs
from the one calculated at the specification creation step.

# mtree -s 3483151339707503 -c -K cksum,sha256digest -p /bin >
/root/.bin_chksum_mtree
mtree: /bin checksum: 1817933408

# mtree -s 3483151339707503 -p /bin < /root/.bin_chksum_mtree >>
/root/.bin_chksum_output    
mtree: /bin checksum: 1510745247

# file .bin_chksum_output 
.bin_chksum_output: empty

The system I'm using is:

# uname -a
FreeBSD firewall 11.2-RELEASE-p2 FreeBSD 11.2-RELEASE-p2 #3 r338073: Mon Aug 20
16:44:39 EEST 2018     root at firewall:/usr/obj/usr/src/sys/GENERIC  amd64

Filesystems used are ZFS all around except tmpfs /tmp and /var/run.

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