[Bug 234031] loader can't traverse filesystem, LUA ERROR: cannot open /boot/lua/loader.lua

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234031

--- Comment #55 from commit-hook at freebsd.org ---
A commit references this bug:

Author: tsoome
Date: Tue Feb  4 07:18:49 UTC 2020
New revision: 357496
URL: https://svnweb.freebsd.org/changeset/base/357496

Log:
  MFC r357442:

  loader: bc_add can not use any other probes than ah=0x4b

  CD boot is broken for some systems since bioscd and biosdisk merge. The issue
is that we can not use anything else than int 13 ah=0x4b to query cd
information.

  The patch does restore the same probe as was originally used in bioscd.c.
Additionally extra buffer padding is used to avoid memory corruption caused by
some systems.

  PR:           234031
  Reported by:  ultramage and others

Changes:
_U  stable/11/
  stable/11/stand/i386/libi386/biosdisk.c

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