linux-kernel - Re: [PATCH] firmware: dmi: Don't restrict access to serial number / UUID

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Message-ID: <c6b85691acc7864a58e94b99296abd4754fb143a.camel@suse.com>
Date:   Fri, 16 Jun 2023 09:47:50 +0000
From:   Jean Delvare <jdelvare@...e.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "mzxreary@...inter.de" <mzxreary@...inter.de>,
        "noodles@...a.com" <noodles@...a.com>,
        "kay.sievers@...y.org" <kay.sievers@...y.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] firmware: dmi: Don't restrict access to serial number /
 UUID

Hi Jonathan,

On Mon, 2023-06-12 at 09:59 +0000, Jonathan McDowell wrote:
> The /sys/devices/virtual/dmi/id/*_serial + product_uuid files are
> currently only readable by root. There's no clear rationale for this;
> Windows + OS X both allow regular users to access the information, so
> there appears to be no expectation on the manufacturer side that it
> should be kept secret.
> (...)

I'll think about it. However, please note that these permissions are
only initial permissions, and nothing prevents user-space from changing
them at run-time. So if a Linux distribution believes there's no reason
to keep these values secret, a simple boot-time script (or maybe just a
couple of udev rules, I'm not sure how powerful these are nowadays)
would solve the problem.

-- 
Jean Delvare
SUSE L3 Support