Re: Nvidia Module Tainting Kernel

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On Sun, 2018-02-25 at 13:00 +1100, Stephen Morris wrote:
> On 25/2/18 12:15 am, Patrick O'Callaghan wrote:
> > On Sat, 2018-02-24 at 15:43 +1100, Stephen Morris wrote:
> > > Are all these taint messages, and all the reasons for a taint message
> > > being produced saying that if we have to build our own drivers into the
> > > kernel to be able to use our hardware, and hence put us into the
> > > situation of potentially not getting support for kernel defects if any
> > > are encountered, that we shouldn't be using linux?
> > 
> > If you encounter a kernel defect, how can it be debugged if part of the
> > kernel is not available? That's what tainting amounts to. IIRC you've
> > said that you compile the Nvidia modules. What you are actually doing
> > is compiling code (the dkms system) that enables Nvidia's binary blobs
> > to be linked as modules into the Linux kernel. You don't (unless you
> > work for Nvidia) have the source code of those blobs.
> 
> I can understand objects being linked together to build an executable 
> module, but what I don't understand, based on what you are saying, is 
> where the source code in the nvidia directory in /usr/src that dkms is 
> compiling has come from if it hasn't come from nvidia?

No-one is saying it doesn't come from Nvidia. What I'm saying is that
that code is *not* the entire Nvidia driver, it's simply linking code
that enables the use of the binary driver they supply.

IOW you don't have the *complete* source of the driver. That's why it's
tainted.

poc
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