[Bug 233478] Authentication fails if password > 128 characters

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233478

            Bug ID: 233478
           Summary: Authentication fails if password > 128 characters
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: standards
          Assignee: standards at FreeBSD.org
          Reporter: asv at inhio.net

After upgrading from 11.1 RELEASE to 11.2 RELEASE through freebsd-update I've
been locked out from my remote server after the reboot.
Further investigation and testing on another FreeBSD 11.2 RELEASE (upgraded
through build world instead and perfectly working) confirmed that I was locked
out because the previous passwords were larger than 128 characters.

Both systems are set "passwd_format=sha512" through login.conf (which I believe
is the default value nowadays).
This issue is something new, was never there and actually forced me to login
and fix it modifying the passwords while in single user mode with something
shorter.

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