Re: [PATCH v5 1/3] Provide in-kernel headers to make extending kernel easier

[Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>]

On Tue, Apr 16, 2019 at 02:49:39PM +0200, Greg Kroah-Hartman wrote:
> On Tue, Apr 16, 2019 at 08:33:06AM -0400, Steven Rostedt wrote:
> > On Mon, 15 Apr 2019 22:50:10 -0500
> > Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> > 
> > > On Mon, Apr 15, 2019 at 9:41 AM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> > > > I agree with this assessment. We shouldn't use config.gz as precedence
> > > > for this solution. config.gz should have been in debugfs to begin with,
> > > > but I don't believe debugfs was around when config.gz was introduced.
> > > > (Don't have time to look into the history of the two).  
> > > 
> > > I don't agree with this: /proc/config.gz is used by a lot of tools
> > > that do sanity-check of running systems. This isn't _debugging_...
> > > it's verifying correct kernel builds. It's a fancy version of checking
> > > /proc/version.
> > > 
> > 
> > Then we should perhaps make a new file system call tarballs ;-)
> > 
> >  /sys/kernel/tarballs/
> > 
> > and place everything there. That way it removes it from /proc (which is
> > the worse place for that) and also makes it something other than debug.
> > That's what I did for tracefs.
> 
> As horrible as that suggestion is, it does kind of make sense :)
> 
> We can't put this in debugfs as that's only for debugging and systems
> should never have that mounted for normal operations (users want to
> build ebpf programs), and /proc really should be for processes but that
> horse is long left the barn.
> 
> But, I'm willing to consider putting this either in a system-fs-like
> filesystem, or just in sysfs itself, we do have /sys/kernel/ to play
> around in if the main objection is that we should not be cluttering up
> /proc with stuff like this.
> 

I am ok with the suggestion of /sys/kernel for the archive. That also seems
to fit well with the idea that the headers are kernel related and probably
belong here more strictly speaking, than /proc.

thanks,

- Joel


> thanks,
> 
> greg k-h