linux/security/integrity/platform_certs/machine_keyring.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Machine keyring routines.
 *
 * Copyright (c) 2021, Oracle and/or its affiliates.
 */

#include <linux/efi.h>
#include "../integrity.h"

static __init int machine_keyring_init(void)
{ … }
device_initcall(machine_keyring_init);

void __init add_to_machine_keyring(const char *source, const void *data, size_t len)
{ … }

/*
 * Try to load the MokListTrustedRT MOK 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)
{ … }

static bool __init trust_moklist(void)
{ … }

/*
 * Provides platform specific check for trusting imputed keys before loading
 * on .machine keyring. UEFI systems enable this trust based on a variable,
 * and for other platforms, it is always enabled.
 */
bool __init imputed_trust_enabled(void)
{ … }