Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
 *
 * Authors:
 * Reiner Sailer      <sailer@watson.ibm.com>
 * Leendert van Doorn <leendert@watson.ibm.com>
 * Mimi Zohar         <zohar@us.ibm.com>
 *
 * File: ima_init.c
 *             initialization and cleanup functions
 */
 
#include <linux/init.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/err.h>
 
#include "ima.h"
 
/* name for boot aggregate entry */
const char boot_aggregate_name[] = "boot_aggregate";
struct tpm_chip *ima_tpm_chip;
 
/* Add the boot aggregate to the IMA measurement list and extend
 * the PCR register.
 *
 * Calculate the boot aggregate, a hash over tpm registers 0-7,
 * assuming a TPM chip exists, and zeroes if the TPM chip does not
 * exist.  Add the boot aggregate measurement to the measurement
 * list and extend the PCR register.
 *
 * If a tpm chip does not exist, indicate the core root of trust is
 * not hardware based by invalidating the aggregate PCR value.
 * (The aggregate PCR value is invalidated by adding one value to
 * the measurement list and extending the aggregate PCR value with
 * a different value.) Violations add a zero entry to the measurement
 * list and extend the aggregate PCR value with ff...ff's.
 */
static int __init ima_add_boot_aggregate(void)
{
<------>static const char op[] = "add_boot_aggregate";
<------>const char *audit_cause = "ENOMEM";
<------>struct ima_template_entry *entry;
<------>struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
<------>struct ima_event_data event_data = { .iint = iint,
<------><------><------><------><------>     .filename = boot_aggregate_name };
<------>int result = -ENOMEM;
<------>int violation = 0;
<------>struct {
<------><------>struct ima_digest_data hdr;
<------><------>char digest[TPM_MAX_DIGEST_SIZE];
<------>} hash;
 
<------>memset(iint, 0, sizeof(*iint));
<------>memset(&hash, 0, sizeof(hash));
<------>iint->ima_hash = &hash.hdr;
<------>iint->ima_hash->algo = ima_hash_algo;
<------>iint->ima_hash->length = hash_digest_size[ima_hash_algo];
 
<------>/*
<------> * With TPM 2.0 hash agility, TPM chips could support multiple TPM
<------> * PCR banks, allowing firmware to configure and enable different
<------> * banks.  The SHA1 bank is not necessarily enabled.
<------> *
<------> * Use the same hash algorithm for reading the TPM PCRs as for
<------> * calculating the boot aggregate digest.  Preference is given to
<------> * the configured IMA default hash algorithm.  Otherwise, use the
<------> * TCG required banks - SHA256 for TPM 2.0, SHA1 for TPM 1.2.
<------> * Ultimately select SHA1 also for TPM 2.0 if the SHA256 PCR bank
<------> * is not found.
<------> */
<------>if (ima_tpm_chip) {
<------><------>result = ima_calc_boot_aggregate(&hash.hdr);
<------><------>if (result < 0) {
<------><------><------>audit_cause = "hashing_error";
<------><------><------>goto err_out;
<------><------>}
<------>}
 
<------>result = ima_alloc_init_template(&event_data, &entry, NULL);
<------>if (result < 0) {
<------><------>audit_cause = "alloc_entry";
<------><------>goto err_out;
<------>}
 
<------>result = ima_store_template(entry, violation, NULL,
<------><------><------><------>    boot_aggregate_name,
<------><------><------><------>    CONFIG_IMA_MEASURE_PCR_IDX);
<------>if (result < 0) {
<------><------>ima_free_template_entry(entry);
<------><------>audit_cause = "store_entry";
<------><------>goto err_out;
<------>}
<------>return 0;
err_out:
<------>integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op,
<------><------><------>    audit_cause, result, 0);
<------>return result;
}
 
#ifdef CONFIG_IMA_LOAD_X509
void __init ima_load_x509(void)
{
<------>int unset_flags = ima_policy_flag & IMA_APPRAISE;
 
<------>ima_policy_flag &= ~unset_flags;
<------>integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH);
<------>ima_policy_flag |= unset_flags;
}
#endif
 
int __init ima_init(void)
{
<------>int rc;
 
<------>ima_tpm_chip = tpm_default_chip();
<------>if (!ima_tpm_chip)
<------><------>pr_info("No TPM chip found, activating TPM-bypass!\n");
 
<------>rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA);
<------>if (rc)
<------><------>return rc;
 
<------>rc = ima_init_crypto();
<------>if (rc)
<------><------>return rc;
<------>rc = ima_init_template();
<------>if (rc != 0)
<------><------>return rc;
 
<------>/* It can be called before ima_init_digests(), it does not use TPM. */
<------>ima_load_kexec_buffer();
 
<------>rc = ima_init_digests();
<------>if (rc != 0)
<------><------>return rc;
<------>rc = ima_add_boot_aggregate();	/* boot aggregate must be first entry */
<------>if (rc != 0)
<------><------>return rc;
 
<------>ima_init_policy();
 
<------>rc = ima_fs_init();
<------>if (rc != 0)
<------><------>return rc;
 
<------>ima_init_key_queue();
 
<------>return rc;
}