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/freebsd-11-stable/sys/i386/i386/
H A Dvm86bios.sdiff 145025 Wed Apr 13 16:13:40 MDT 2005 peter Fix an evil bug that appeared in September 2003. VM86 bios calls use two
of the __pcb_spare longs. Except that fields were changed and one of the
spare values was used and the __pcb_spare field was reduced from two to one
long. Now VM86 bios calls can trash the first 4 bytes of the next page
following the kernel stack/pcb. This Is Bad(TM). This bug has been
present in 5.2-release and onwards, and is still in RELENG_5.

Instead of tempting fate and trying to use "spare" fields, explicitly
reserve them.
H A Dgenassym.cdiff 145025 Wed Apr 13 16:13:40 MDT 2005 peter Fix an evil bug that appeared in September 2003. VM86 bios calls use two
of the __pcb_spare longs. Except that fields were changed and one of the
spare values was used and the __pcb_spare field was reduced from two to one
long. Now VM86 bios calls can trash the first 4 bytes of the next page
following the kernel stack/pcb. This Is Bad(TM). This bug has been
present in 5.2-release and onwards, and is still in RELENG_5.

Instead of tempting fate and trying to use "spare" fields, explicitly
reserve them.

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