linux-kernel - Re: [PATCH v5 1/1] modules: add modalias file to sysfs for modules.

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Message-ID: <Y4n0RWqSwDHVT+HA@kroah.com>
Date:   Fri, 2 Dec 2022 13:49:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Allen Webb <allenwebb@...gle.com>
Cc:     "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v5 1/1] modules: add modalias file to sysfs for modules.

On Thu, Dec 01, 2022 at 03:16:30PM -0600, Allen Webb wrote:
> USB devices support the authorized attribute which can be used by

You don't mention USB in the subject line?

> user-space to implement trust-based systems for enabling USB devices. It
> would be helpful when building these systems to be able to know in
> advance which kernel drivers (or modules) are reachable from a
> particular USB device.
> 
> This information is readily available for external modules in
> modules.alias. However, builtin kernel modules are not covered. This
> patch adds a sys-fs attribute to both builtin and loaded modules

"sysfs"  No "-", that only goes in my last name :)

And as you added sysfs files, you have to also have Documentation/ABI/
entries that describe the new files.  Without that, this patch can't
even be considered for review :(

And maybe this should be a patch series and not just 1 patch?  Remember
a patch can only do "one logical thing", and you seem to be doing a lot
of different things in this single patch.

Would you be able to review this patch as-is if you were in our shoes?
Remember we deal with thousands of patches each week.

> exposing the matching rules in the modalias format for integration
> with tools like USBGuard.
> 
> Note that as written CONFIG_MODULES must be enabled.

What happens if CONFIG_MODULES is not enabled?  And why should that
matter?

thanks,

greg k-h