linux-kernel - Re: [RFC PATCH v1] platform/x86: wmi: Do not register driver with invalid GUID

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Date:   Mon, 17 Jul 2023 11:23:50 +0000
From:   Barnabás Pőcze <pobrn@...tonmail.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        Mark Gross <markgross@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Armin Wolf <W_Armin@....de>
Subject: Re: [RFC PATCH v1] platform/x86: wmi: Do not register driver with invalid GUID

Hi

2023. július 17., hétfő 11:49 keltezéssel, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> írta:

On Sat, Jul 15, 2023 at 09:24:16PM +0000, Barnabás Pőcze wrote:
> > Since a WMI driver's ID table contains strings it is relatively
> > easy to make mistakes. At the moment, there is no feedback
> > if any of the specified GUIDs are invalid (since
> > 028e6e204ace1f080cfeacd72c50397eb8ae8883).
> >
> > So check if the GUIDs in the driver's ID table are valid,
> > print all invalid ones, and refuse to register the driver
> > if any of the GUIDs are invalid.
> 
> Besides using wrong API (uuid_*() vs. guid_*() one), I don't

As far as I can see `guid_parse()` also uses `uuid_is_valid()`, the format is the same.

> think we need to validate it here. Why not in file2alias.c?
> [...]

1) that seems like a more complicated change (duplicating `uuid_is_valid()`?);
2) that will only check the GUIDs specified by `MODULE_DEVICE_TABLE()`.

Arguably the second point is not that significant since most users will indeed
use `MODULE_DEVICE_TABLE()`. But I think the first point has some merit. And
furthermore, I think this check should be here regardless of whether file2alias.c
also contains an equivalent/similar check.

Regards,
Barnabás Pőcze