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.

-- 
        Peter