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

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Date:   Fri, 11 Nov 2022 10:29:05 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Allen Webb <allenwebb@...gle.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Alexey Gladkov <gladkov.alexey@...il.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] modules: add modalias file to sysfs for modules.

On Fri, Nov 11, 2022 at 09:28:52AM -0600, Allen Webb wrote:
> USB devices support the authorized attribute which can be used by
> 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
> exposing the matching rules in the modalias format for integration
> with tools like USBGuard.
> 
> Signed-off-by: Allen Webb <allenwebb@...gle.com>

Thanks for the patch Allen!

I'd rather have something generic though, and it would seem kmod [0] already
does this, have you seen the kmod support for builtin.alias.bin

Can't that be used?

[0] git://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git

  Luis