linux-kernel - Re: [PATCH v6 3/6] KEYS: trusted: Introduce NXP DCP-backed trusted keys

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Date: Fri, 8 Mar 2024 08:17:35 +0100
From: David Gstir <david@...ma-star.at>
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: Mimi Zohar <zohar@...ux.ibm.com>,
 James Bottomley <jejb@...ux.ibm.com>,
 Herbert Xu <herbert@...dor.apana.org.au>,
 "David S. Miller" <davem@...emloft.net>,
 Shawn Guo <shawnguo@...nel.org>,
 Jonathan Corbet <corbet@....net>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 "kernel@...gutronix.de" <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>,
 NXP Linux Team <linux-imx@....com>,
 Ahmad Fatoum <a.fatoum@...gutronix.de>,
 sigma star Kernel Team <upstream+dcp@...ma-star.at>,
 David Howells <dhowells@...hat.com>,
 Li Yang <leoyang.li@....com>,
 Paul Moore <paul@...l-moore.com>,
 James Morris <jmorris@...ei.org>,
 "Serge E. Hallyn" <serge@...lyn.com>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Randy Dunlap <rdunlap@...radead.org>,
 Catalin Marinas <catalin.marinas@....com>,
 "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
 Tejun Heo <tj@...nel.org>,
 "Steven Rostedt (Google)" <rostedt@...dmis.org>,
 linux-doc@...r.kernel.org,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
 "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
 "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
 linux-arm-kernel@...ts.infradead.org,
 linuxppc-dev@...ts.ozlabs.org,
 "linux-security-module@...r.kernel.org" <linux-security-module@...r.kernel.org>,
 Richard Weinberger <richard@....at>,
 David Oberhollenzer <david.oberhollenzer@...ma-star.at>
Subject: Re: [PATCH v6 3/6] KEYS: trusted: Introduce NXP DCP-backed trusted
 keys

Hi Jarkko,

> On 07.03.2024, at 20:30, Jarkko Sakkinen <jarkko@...nel.org> wrote:

[...]

>> +
>> +static int trusted_dcp_init(void)
>> +{
>> + int ret;
>> +
>> + if (use_otp_key)
>> + pr_info("Using DCP OTP key\n");
>> +
>> + ret = test_for_zero_key();
>> + if (ret) {
>> + pr_err("Test for zero'ed keys failed: %i\n", ret);
> 
> I'm not sure whether this should err or warn.
> 
> What sort of situations can cause the test the fail (e.g.
> adversary/interposer, bad configuration etc.).

This occurs when the hardware is not in "secure mode". I.e. it’s a bad configuration issue.
Once the board is properly configured, this will never trigger again.
Do you think a warning is better for this then?

Thanks,
- David