[TUHS] SCO's "evidence" (was: RIP Darl McBride former CEO of SCO)

[Warner Losh]

On Mon, Nov 4, 2024, 6:54 PM Larry McVoy <lm at mcvoy.com> wrote:

> On Mon, Nov 04, 2024 at 06:35:30PM -0700, Warner Losh wrote:
> > On Mon, Nov 4, 2024 at 6:09???PM Larry McVoy <lm at mcvoy.com> wrote:
> >
> > > The thing I never got a reasonable answer to was I found code in BSD
> that
> > > was identical to code going back to at least V7.  Find bmap() in the
> UFS
> > > code and then find the same in V7.  I might be wrong about V7, might be
> > > 32V, might be V6.  I don't think it matters, it's the same in all of
> them.
> >
> >
> > bmap() is the code that maps a logical block to a phsyical block,
> > > I'm quite familiar with it because I rewrote it to bmap_write() and
> > > bmap_read() as part of making UFS do extents:
> > >
> > > http://mcvoy.com/lm/papers/SunOS.ufs_clustering.pdf
> > >
> > > When all the lawsuits were going on, since I knew that code really
> well,
> > > I went off and looked and the BSD code at that time had bit for bit
> > > identical bmap() implementations.
> > >
> > > I never understood why BSD could claim they rewrote everything when
> they
> > > clearly had not rewritten that.
> > >
> > > I've raised this question before and I just went and looked, bmap() has
> > > changed.  I'm pretty sure I have Kirk's BSD source releases, if I do,
> > > I'm 100% sure I can back up what I'm saying.  Not sure I care enough to
> > > do so, it's all water under the bridge at this point.
> > >
> >
> > The short answer is that ffs_bmap.c was one of the 70 files that had
> > a AT&T copyright notice added to it as part of the AT&T vs Regents suit.
> > By the time 4.4BSD had been released, the file had been substantially
> > rewritten, but some traces of original AT&T code remained.
>
> Yeah, this is completely a false claim.  It was identical.  At least
> in 4.3 BSD, I can imagine that 4.4 changed it because I was pointing
> this out around then.
>

4.3bsd wasn't claimed to be a rewrite. 4.4bsd definitely was very
different. I checked before I posted. So what i said is not false. I
literally had the code up side by side 20 minutes ago. It is definitely
different though clearly related and derived a bit. That function is
absolutely not 100% copied.

For the record, I'm a BSD guy, my OS was SunOS 4.x, it was a bug fixed
> BSD.  If there ever was a guy that wanted this to be true, it's me.
> It's not true, BSD ripped off Bell Labs code, that's a fact.
>

Except not in 4.4. 4.3 never was claimed to be a rewrite. You needed a AT&T
license, prior to the ancient Unix license to get that. So there was no
claim to originality prior to 4.4. I didn't look at net/2 though.

I'll check after dinner for 4.3bsd and 4.2bsd, but since FFS/UFS is on disk
different than v7fs I don't expect it to be identical.

Warner

>
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