linux-kernel - Re: [PATCH v39 11/24] x86/sgx: Add SGX enclave driver

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Message-ID: <20201009072141.GA12545@kroah.com>
Date:   Fri, 9 Oct 2020 09:21:41 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jethro Beekman <jethro@...tanix.com>,
        Haitao Huang <haitao.huang@...ux.intel.com>,
        Chunyang Hui <sanqian.hcy@...fin.com>,
        Jordan Hand <jorhand@...ux.microsoft.com>,
        Nathaniel McCallum <npmccallum@...hat.com>,
        Seth Moore <sethmo@...gle.com>,
        Darren Kenny <darren.kenny@...cle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Suresh Siddha <suresh.b.siddha@...el.com>,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com, bp@...en8.de,
        cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com, kai.huang@...el.com,
        kai.svahn@...el.com, kmoy@...gle.com, ludloff@...gle.com,
        luto@...nel.org, nhorman@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, tglx@...utronix.de, yaozhangx@...gle.com,
        mikko.ylinen@...el.com
Subject: Re: [PATCH v39 11/24] x86/sgx: Add SGX enclave driver

On Fri, Oct 09, 2020 at 09:10:45AM +0200, Pavel Machek wrote:
> Hi!
> 
> > > new file mode 100644
> > > index 000000000000..f54da5f19c2b
> > > --- /dev/null
> > > +++ b/arch/x86/kernel/cpu/sgx/driver.c
> > > @@ -0,0 +1,173 @@
> > > +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
> > 
> > You use gpl-only header files in this file, so how in the world can it
> > be bsd-3 licensed?
> > 
> > Please get your legal department to agree with this, after you explain
> > to them how you are mixing gpl2-only code in with this file.
> 
> This specifies license of driver.c, not of the headers included. Are
> you saying that it is impossible to have a kernel driver with anything
> else than GPL-2? That would be news to many, and that's not what
> current consensus is.

If you want to write any non-GPL-2-only kernel code, you had better be
consulting your lawyers and get very explicit instructions on how to do
this in a way that does not violate any licenses.

I am not a lawyer, and will not be giving you any such advice, as I
think it's not something that people should be doing.

greg k-h