linux-kernel - Re: [PATCH v6 12/13] integrity: Trust MOK keys if MokListTrustedRT found

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Message-Id: <9C5B2B68-5F03-472F-8B17-E0A716C85CF2@oracle.com>
Date:   Thu, 16 Sep 2021 20:00:54 -0600
From:   Eric Snowberg <eric.snowberg@...cle.com>
To:     Peter Jones <pjones@...hat.com>
Cc:     keyrings@...r.kernel.org,
        linux-integrity <linux-integrity@...r.kernel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>, keescook@...omium.org,
        gregkh@...uxfoundation.org, torvalds@...ux-foundation.org,
        scott.branden@...adcom.com, weiyongjun1@...wei.com,
        nayna@...ux.ibm.com, ebiggers@...gle.com, ardb@...nel.org,
        nramas@...ux.microsoft.com, lszubowi@...hat.com,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        James.Bottomley@...senPartnership.com,
        "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
Subject: Re: [PATCH v6 12/13] integrity: Trust MOK keys if MokListTrustedRT
 found


> On Sep 16, 2021, at 4:19 PM, Peter Jones <pjones@...hat.com> wrote:
> 
> On Tue, Sep 14, 2021 at 05:14:15PM -0400, Eric Snowberg wrote:
>> +/*
>> + * Try to load the MokListTrustedRT UEFI variable to see if we should trust
>> + * the mok keys within the kernel. It is not an error if this variable
>> + * does not exist.  If it does not exist, mok keys should not be trusted
>> + * within the machine keyring.
>> + */
>> +static __init bool uefi_check_trust_mok_keys(void)
>> +{
>> +	efi_status_t status;
>> +	unsigned int mtrust = 0;
>> +	unsigned long size = sizeof(mtrust);
>> +	efi_guid_t guid = EFI_SHIM_LOCK_GUID;
>> +	u32 attr;
>> +
>> +	status = efi.get_variable(L"MokListTrustedRT", &guid, &attr, &size, &mtrust);
> 
> This should use efi_mokvar_entry_find("MokListTrustedRT") instead,
> similar to how load_moklist_certs() does.  It's a *much* more reliable
> mechanism.  We don't even need to fall back to checking for the
> variable, as any version of shim that populates this supports the config
> table method.

I’ll change this in v7, thanks.