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tpm: modularize event log collection
Break ACPI-specific pieces of the event log handling into their own file and create tpm_eventlog.[ch] to store common event log handling code. This will be required to integrate future event log sources on platforms without ACPI tables. Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
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Kent Yoder
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Aug 22, 2012
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| /* | ||
| * Copyright (C) 2005 IBM Corporation | ||
| * | ||
| * Authors: | ||
| * Seiji Munetoh <munetoh@jp.ibm.com> | ||
| * Stefan Berger <stefanb@us.ibm.com> | ||
| * Reiner Sailer <sailer@watson.ibm.com> | ||
| * Kylene Hall <kjhall@us.ibm.com> | ||
| * | ||
| * Maintained by: <tpmdd-devel@lists.sourceforge.net> | ||
| * | ||
| * Access to the eventlog extended by the TCG BIOS of PC platform | ||
| * | ||
| * 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; either version | ||
| * 2 of the License, or (at your option) any later version. | ||
| * | ||
| */ | ||
|
|
||
| #include <linux/seq_file.h> | ||
| #include <linux/fs.h> | ||
| #include <linux/security.h> | ||
| #include <linux/module.h> | ||
| #include <linux/slab.h> | ||
| #include <acpi/acpi.h> | ||
|
|
||
| #include "tpm.h" | ||
| #include "tpm_eventlog.h" | ||
|
|
||
| struct acpi_tcpa { | ||
| struct acpi_table_header hdr; | ||
| u16 platform_class; | ||
| union { | ||
| struct client_hdr { | ||
| u32 log_max_len __attribute__ ((packed)); | ||
| u64 log_start_addr __attribute__ ((packed)); | ||
| } client; | ||
| struct server_hdr { | ||
| u16 reserved; | ||
| u64 log_max_len __attribute__ ((packed)); | ||
| u64 log_start_addr __attribute__ ((packed)); | ||
| } server; | ||
| }; | ||
| }; | ||
|
|
||
| /* read binary bios log */ | ||
| int read_log(struct tpm_bios_log *log) | ||
| { | ||
| struct acpi_tcpa *buff; | ||
| acpi_status status; | ||
| struct acpi_table_header *virt; | ||
| u64 len, start; | ||
|
|
||
| if (log->bios_event_log != NULL) { | ||
| printk(KERN_ERR | ||
| "%s: ERROR - Eventlog already initialized\n", | ||
| __func__); | ||
| return -EFAULT; | ||
| } | ||
|
|
||
| /* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */ | ||
| status = acpi_get_table(ACPI_SIG_TCPA, 1, | ||
| (struct acpi_table_header **)&buff); | ||
|
|
||
| if (ACPI_FAILURE(status)) { | ||
| printk(KERN_ERR "%s: ERROR - Could not get TCPA table\n", | ||
| __func__); | ||
| return -EIO; | ||
| } | ||
|
|
||
| switch(buff->platform_class) { | ||
| case BIOS_SERVER: | ||
| len = buff->server.log_max_len; | ||
| start = buff->server.log_start_addr; | ||
| break; | ||
| case BIOS_CLIENT: | ||
| default: | ||
| len = buff->client.log_max_len; | ||
| start = buff->client.log_start_addr; | ||
| break; | ||
| } | ||
| if (!len) { | ||
| printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__); | ||
| return -EIO; | ||
| } | ||
|
|
||
| /* malloc EventLog space */ | ||
| log->bios_event_log = kmalloc(len, GFP_KERNEL); | ||
| if (!log->bios_event_log) { | ||
| printk("%s: ERROR - Not enough Memory for BIOS measurements\n", | ||
| __func__); | ||
| return -ENOMEM; | ||
| } | ||
|
|
||
| log->bios_event_log_end = log->bios_event_log + len; | ||
|
|
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| virt = acpi_os_map_memory(start, len); | ||
|
|
||
| memcpy(log->bios_event_log, virt, len); | ||
|
|
||
| acpi_os_unmap_memory(virt, len); | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
|
|
||
| #ifndef __TPM_EVENTLOG_H__ | ||
| #define __TPM_EVENTLOG_H__ | ||
|
|
||
| #define TCG_EVENT_NAME_LEN_MAX 255 | ||
| #define MAX_TEXT_EVENT 1000 /* Max event string length */ | ||
| #define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */ | ||
|
|
||
| enum bios_platform_class { | ||
| BIOS_CLIENT = 0x00, | ||
| BIOS_SERVER = 0x01, | ||
| }; | ||
|
|
||
| struct tpm_bios_log { | ||
| void *bios_event_log; | ||
| void *bios_event_log_end; | ||
| }; | ||
|
|
||
| struct tcpa_event { | ||
| u32 pcr_index; | ||
| u32 event_type; | ||
| u8 pcr_value[20]; /* SHA1 */ | ||
| u32 event_size; | ||
| u8 event_data[0]; | ||
| }; | ||
|
|
||
| enum tcpa_event_types { | ||
| PREBOOT = 0, | ||
| POST_CODE, | ||
| UNUSED, | ||
| NO_ACTION, | ||
| SEPARATOR, | ||
| ACTION, | ||
| EVENT_TAG, | ||
| SCRTM_CONTENTS, | ||
| SCRTM_VERSION, | ||
| CPU_MICROCODE, | ||
| PLATFORM_CONFIG_FLAGS, | ||
| TABLE_OF_DEVICES, | ||
| COMPACT_HASH, | ||
| IPL, | ||
| IPL_PARTITION_DATA, | ||
| NONHOST_CODE, | ||
| NONHOST_CONFIG, | ||
| NONHOST_INFO, | ||
| }; | ||
|
|
||
| struct tcpa_pc_event { | ||
| u32 event_id; | ||
| u32 event_size; | ||
| u8 event_data[0]; | ||
| }; | ||
|
|
||
| enum tcpa_pc_event_ids { | ||
| SMBIOS = 1, | ||
| BIS_CERT, | ||
| POST_BIOS_ROM, | ||
| ESCD, | ||
| CMOS, | ||
| NVRAM, | ||
| OPTION_ROM_EXEC, | ||
| OPTION_ROM_CONFIG, | ||
| OPTION_ROM_MICROCODE = 10, | ||
| S_CRTM_VERSION, | ||
| S_CRTM_CONTENTS, | ||
| POST_CONTENTS, | ||
| HOST_TABLE_OF_DEVICES, | ||
| }; | ||
|
|
||
| int read_log(struct tpm_bios_log *log); | ||
| #endif |