CVS commit: src/sys/arch/i386/conf

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Fri Jul 28 13:59:07 UTC 2017

Modified Files:
        src/sys/arch/i386/conf: GENERIC

Log Message:
Disable vm86 by default. The use case is limited, and the potential for
damage is too high.

This code is fragile, and relies on a certain number of assumptions, some
of which are not be totally true. For example, it relies on the fact that
a 16bit process cannot perform a syscall, but verily it can. The slighest
confusion in the trap frame can lead to ring0 exploits. Also, I'm not
convinced that it interacts well with the compatibility layers.


To generate a diff of this commit:
cvs rdiff -u -r1.1157 -r1.1158 src/sys/arch/i386/conf/GENERIC

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.