Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!rpi!crdgw1!crdos1!davidsen
From: davidsen@crdos1.crd.ge.COM (Wm E Davidsen Jr)
Newsgroups: comp.arch
Subject: Re: Self-modifying code
Summary: Oh lord, I am a sinner!
Message-ID: <1318@crdos1.crd.ge.COM>
Date: 23 Oct 89 12:56:44 GMT
References: <480@gp.govt.nz> <6481@pt.cs.cmu.edu> <9175@etana.tut.fi> <12288@cit-vax.Caltech.Edu>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: GE Corp R&D Center
Lines: 20


  I was feeling smug about not having written any self modifying code in
years when I remembered that I HAD written a program which modifies the
o/s in memory.

  It seems that people were posting patches for every version of DOS
known to allow ^W and ^U to work as they do in UNIX. I wrote a small
program to search the core image, find the location for the patch and
the patch area, and apply the fix. This avoids having a hacked version
of the the o/s on a disk, which always worries people in these virus
ridden days.

  It was called CTLENABL, and works on DOS 2.0-4.0. DOS users run it in
their autoexec, usually. Now if DOS only included the source...

-- 
bill davidsen	(davidsen@crdos1.crd.GE.COM -or- uunet!crdgw1!crdos1!davidsen)
"The world is filled with fools. They blindly follow their so-called
'reason' in the face of the church and common sense. Any fool can see
that the world is flat!" - anon