mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/drivers/char/tpm/eventlog/acpi.c
..
..
@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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2
 /*
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  * Copyright (C) 2005 IBM Corporation
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  *
..
..
@@ -11,12 +12,6 @@
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  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
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  *
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  * Access to the event log extended by the TCG BIOS of PC platform
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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
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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- *
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15
  */
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16
 
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 #include <linux/seq_file.h>
..
..
@@ -46,6 +41,27 @@
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 	};
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 };
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43
 
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+/* Check that the given log is indeed a TPM2 log. */
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+static bool tpm_is_tpm2_log(void *bios_event_log, u64 len)
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+{
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+	struct tcg_efi_specid_event_head *efispecid;
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+	struct tcg_pcr_event *event_header;
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+	int n;
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+
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+	if (len < sizeof(*event_header))
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+		return false;
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+	len -= sizeof(*event_header);
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+	event_header = bios_event_log;
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+
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+	if (len < sizeof(*efispecid))
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+		return false;
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+	efispecid = (struct tcg_efi_specid_event_head *)event_header->event;
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+
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+	n = memcmp(efispecid->signature, TCG_SPECID_SIG,
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+		   sizeof(TCG_SPECID_SIG));
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+	return n == 0;
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+}
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+
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 /* read binary bios log */
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 int tpm_read_log_acpi(struct tpm_chip *chip)
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 {
..
..
@@ -54,9 +70,10 @@
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 	void __iomem *virt;
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 	u64 len, start;
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 	struct tpm_bios_log *log;
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-
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-	if (chip->flags & TPM_CHIP_FLAG_TPM2)
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-		return -ENODEV;
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+	struct acpi_table_tpm2 *tbl;
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+	struct acpi_tpm2_phy *tpm2_phy;
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+	int format;
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+	int ret;
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77
 
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 	log = &chip->log;
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79
 
..
..
@@ -66,23 +83,44 @@
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 	if (!chip->acpi_dev_handle)
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 		return -ENODEV;
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85
 
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-	/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
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-	status = acpi_get_table(ACPI_SIG_TCPA, 1,
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-				(struct acpi_table_header **)&buff);
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+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
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+		status = acpi_get_table("TPM2", 1,
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+					(struct acpi_table_header **)&tbl);
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+		if (ACPI_FAILURE(status))
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+			return -ENODEV;
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91
 
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-	if (ACPI_FAILURE(status))
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-		return -ENODEV;
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+		if (tbl->header.length <
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+				sizeof(*tbl) + sizeof(struct acpi_tpm2_phy))
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+			return -ENODEV;
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95
 
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-	switch(buff->platform_class) {
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-	case BIOS_SERVER:
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-		len = buff->server.log_max_len;
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-		start = buff->server.log_start_addr;
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-		break;
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-	case BIOS_CLIENT:
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-	default:
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-		len = buff->client.log_max_len;
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-		start = buff->client.log_start_addr;
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-		break;
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+		tpm2_phy = (void *)tbl + sizeof(*tbl);
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+		len = tpm2_phy->log_area_minimum_length;
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+
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+		start = tpm2_phy->log_area_start_address;
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+		if (!start || !len)
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+			return -ENODEV;
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+
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+		format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
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+	} else {
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+		/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
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+		status = acpi_get_table(ACPI_SIG_TCPA, 1,
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+					(struct acpi_table_header **)&buff);
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+		if (ACPI_FAILURE(status))
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+			return -ENODEV;
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+
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+		switch (buff->platform_class) {
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+		case BIOS_SERVER:
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+			len = buff->server.log_max_len;
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+			start = buff->server.log_start_addr;
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+			break;
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+		case BIOS_CLIENT:
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+		default:
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+			len = buff->client.log_max_len;
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+			start = buff->client.log_start_addr;
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+			break;
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+		}
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+
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+		format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
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 	}
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 	if (!len) {
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 		dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__);
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@@ -96,6 +134,7 @@
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134
 
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 	log->bios_event_log_end = log->bios_event_log + len;
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136
 
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+	ret = -EIO;
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 	virt = acpi_os_map_iomem(start, len);
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 	if (!virt)
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 		goto err;
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@@ -103,11 +142,19 @@
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 	memcpy_fromio(log->bios_event_log, virt, len);
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143
 
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 	acpi_os_unmap_iomem(virt, len);
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-	return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
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+
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+	if (chip->flags & TPM_CHIP_FLAG_TPM2 &&
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+	    !tpm_is_tpm2_log(log->bios_event_log, len)) {
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+		/* try EFI log next */
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+		ret = -ENODEV;
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+		goto err;
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+	}
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+
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+	return format;
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154
 
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 err:
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 	kfree(log->bios_event_log);
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 	log->bios_event_log = NULL;
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-	return -EIO;
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+	return ret;
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159
 
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 }