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/*
* This file is part of the coreboot project.
*
* Copyright 2018 Facebook Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <string.h>
#include <cbmem.h>
#include <console/console.h>
#include <security/tpm/tspi.h>
static struct tcpa_table *tcpa_log_init(void)
{
MAYBE_STATIC struct tcpa_table *tclt = NULL;
if (!cbmem_possibly_online())
return NULL;
if (tclt != NULL)
return tclt;
tclt = (struct tcpa_table *) cbmem_entry_find(CBMEM_ID_TCPA_LOG);
if (tclt)
return tclt;
tclt = cbmem_add(CBMEM_ID_TCPA_LOG,
sizeof(struct tcpa_table) +
MAX_TCPA_LOG_ENTRIES *
sizeof(struct tcpa_entry));
if (!tclt) {
printk(BIOS_ERR, "ERROR: Could not create TCPA log table\n");
return NULL;
}
tclt->max_entries = MAX_TCPA_LOG_ENTRIES;
tclt->num_entries = 0;
printk(BIOS_DEBUG, "TCPA log created at %p\n", tclt);
return tclt;
}
void tcpa_log_add_table_entry(const char *name, const uint32_t pcr,
const uint8_t *digest, const size_t digest_length)
{
struct tcpa_table *tclt;
struct tcpa_entry *tce;
tclt = tcpa_log_init();
if (!tclt)
return;
if (tclt->num_entries == tclt->max_entries) {
printk(BIOS_WARNING, "ERROR: TCPA log table is full\n");
return;
}
tce = &tclt->entries[tclt->num_entries++];
strncpy(tce->name, name, TCPA_PCR_HASH_NAME - 1);
tce->pcr = pcr;
if (digest_length > TCPA_DIGEST_MAX_LENGTH) {
printk(BIOS_WARNING, "ERROR: PCR digest too long for TCPA log entry\n");
return;
}
memcpy(tce->digest, digest, digest_length);
tce->digest_length = digest_length;
}
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