add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/security/integrity/ima/ima_init.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2005,2006,2007,2008 IBM Corporation
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  *
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@@ -6,18 +7,11 @@
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  * Leendert van Doorn <leendert@watson.ibm.com>
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  * Mimi Zohar         <zohar@us.ibm.com>
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  *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License as
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- * published by the Free Software Foundation, version 2 of the
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- * License.
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- *
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  * File: ima_init.c
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  *             initialization and cleanup functions
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  */
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-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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-
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-#include <linux/module.h>
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+#include <linux/init.h>
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 #include <linux/scatterlist.h>
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 #include <linux/slab.h>
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 #include <linux/err.h>
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@@ -31,7 +25,7 @@
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 /* Add the boot aggregate to the IMA measurement list and extend
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  * the PCR register.
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  *
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- * Calculate the boot aggregate, a SHA1 over tpm registers 0-7,
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+ * Calculate the boot aggregate, a hash over tpm registers 0-7,
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  * assuming a TPM chip exists, and zeroes if the TPM chip does not
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  * exist.  Add the boot aggregate measurement to the measurement
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  * list and extend the PCR register.
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@@ -49,21 +43,33 @@
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 	const char *audit_cause = "ENOMEM";
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 	struct ima_template_entry *entry;
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 	struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
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-	struct ima_event_data event_data = {iint, NULL, boot_aggregate_name,
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-					    NULL, 0, NULL};
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+	struct ima_event_data event_data = { .iint = iint,
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+					     .filename = boot_aggregate_name };
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 	int result = -ENOMEM;
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 	int violation = 0;
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 	struct {
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 		struct ima_digest_data hdr;
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-		char digest[TPM_DIGEST_SIZE];
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+		char digest[TPM_MAX_DIGEST_SIZE];
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 	} hash;
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 	memset(iint, 0, sizeof(*iint));
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 	memset(&hash, 0, sizeof(hash));
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 	iint->ima_hash = &hash.hdr;
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-	iint->ima_hash->algo = HASH_ALGO_SHA1;
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-	iint->ima_hash->length = SHA1_DIGEST_SIZE;
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+	iint->ima_hash->algo = ima_hash_algo;
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+	iint->ima_hash->length = hash_digest_size[ima_hash_algo];
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+	/*
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+	 * With TPM 2.0 hash agility, TPM chips could support multiple TPM
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+	 * PCR banks, allowing firmware to configure and enable different
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+	 * banks.  The SHA1 bank is not necessarily enabled.
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+	 *
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+	 * Use the same hash algorithm for reading the TPM PCRs as for
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+	 * calculating the boot aggregate digest.  Preference is given to
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+	 * the configured IMA default hash algorithm.  Otherwise, use the
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+	 * TCG required banks - SHA256 for TPM 2.0, SHA1 for TPM 1.2.
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+	 * Ultimately select SHA1 also for TPM 2.0 if the SHA256 PCR bank
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+	 * is not found.
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+	 */
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 	if (ima_tpm_chip) {
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 		result = ima_calc_boot_aggregate(&hash.hdr);
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 		if (result < 0) {
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@@ -72,7 +78,7 @@
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 		}
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 	}
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-	result = ima_alloc_init_template(&event_data, &entry);
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+	result = ima_alloc_init_template(&event_data, &entry, NULL);
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 	if (result < 0) {
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 		audit_cause = "alloc_entry";
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 		goto err_out;
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@@ -123,13 +129,23 @@
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 	if (rc != 0)
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 		return rc;
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+	/* It can be called before ima_init_digests(), it does not use TPM. */
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 	ima_load_kexec_buffer();
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+	rc = ima_init_digests();
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+	if (rc != 0)
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+		return rc;
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 	rc = ima_add_boot_aggregate();	/* boot aggregate must be first entry */
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 	if (rc != 0)
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 		return rc;
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 	ima_init_policy();
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-	return ima_fs_init();
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+	rc = ima_fs_init();
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+	if (rc != 0)
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+		return rc;
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+
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+	ima_init_key_queue();
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+
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+	return rc;
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 }