RE: Re: Re: Clarification on bpftool dual licensing

Martin Kelly [off-list ref] writes:

quoted

quoted

One other, related question: vmlinux.h (generated by "bpftool btf dump file

/sys/kernel/btf/vmlinux format c"), does not currently contain a license
declaration. I assume this would have to be a GPL header, since vmlinux.h
references many GPL'd Linux kernel structs and similar, though again I'm not a
lawyer and therefore am not certain. Would you all agree with this? If so, any
objection to a patch adding an SPDX line to the generated vmlinux.h?

Is vmlinux DWARF data GPL'ed? I certainly hope not. So vmlinux.h
shouldn't be licensed under GPL.

I have no idea; I had assumed that a struct definition coming from a
GPL-licensed header would have to be GPL, but again, not a lawyer, and
I could totally be wrong. If not GPL though, what would the license
be? Is it just "output of a program" and therefore license-less, even
though the output happens to be code?

Totally not a lawyer either, but:

There's (generally, in many jurisdictions, etc), a minimum bar for when
something is considered a "creative work" and thus copyrightable. Debug
output *could* fall short of this (and thus not be copyrightable at
all). It could also fall under the same "API" umbrella as that famous
Google v Oracle case. Or it could fall under the "syscall exception" of
the kernel source.

I guess it would take a court decision to know either way. IMO it would
make sense if vmlinux.h is not copyrightable for whatever reason, but,
again, IANAL :)

Anyway, while we obviously can't resolve legal matters on the mailing,
we can express the *intention* of the community, which is what the
licensing document is trying to do. So it totally makes sense to mention
vmlinux.h here; the question is what should such a text say?

-Toke