linux-kernel - Re: [PATCH] efi: Do not import certificates from UEFI Secure Boot for T2 Macs

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Date:   Sun, 13 Feb 2022 08:22:32 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     Matthew Garrett <mjg59@...f.ucam.org>
CC:     Ard Biesheuvel <ardb@...nel.org>, Jeremy Kerr <jk@...abs.org>,
        "joeyli.kernel@...il.com" <joeyli.kernel@...il.com>,
        "zohar@...ux.ibm.com" <zohar@...ux.ibm.com>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "eric.snowberg@...cle.com" <eric.snowberg@...cle.com>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "jlee@...e.com" <jlee@...e.com>,
        "James.Bottomley@...senpartnership.com" 
        <James.Bottomley@...senPartnership.com>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "mic@...ikod.net" <mic@...ikod.net>,
        "dmitry.kasatkin@...il.com" <dmitry.kasatkin@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        Orlando Chamberlain <redecorating@...tonmail.com>,
        Aun-Ali Zaidi <admin@...eit.net>
Subject: Re: [PATCH] efi: Do not import certificates from UEFI Secure Boot for
 T2 Macs



> 
> Ok. With CONFIG_LOAD_UEFI_KEYS=n, can you run:
> 
> cat /sys/firmware/efi/efivars/db-d719b2cb-3d3a-4596-a3bc-dad00e67656f
> 
> and see whether it generates the same failure? If so then my (handwavy) 
> guess is that something's going wrong with a firmware codepath for the 
> d719b2cb-3d3a-4596-a3bc-dad00e67656f GUID. Someone could potentially 
> then figure out whether the same happens under Windows, but the easiest 
> thing is probably to just return a failure on Apple hardware when 
> someone tries to access anything with that GUID.

Surprisingly it didn’t cause a crash. The logs are at https://gist.githubusercontent.com/AdityaGarg8/8e820c2724a65fb4bbb5deae2b358dc8/raw/2a003ef43ae06dbe2bcc22b34ba7ccbb03898a21/log2.log

I also tried cat /sys/firmware/efi/efivars/MokIgnoreDB-605dab50-e046-4300-abb6-3dd810dd8b23, but it doesn’t exist

aditya@...Book:~$ cat /sys/firmware/efi/efivars/MokIgnoreDB-605dab50-e046-4300-abb6-3dd810dd8b23
cat: /sys/firmware/efi/efivars/MokIgnoreDB-605dab50-e046-4300-abb6-3dd810dd8b23: No such file or directory