diff options
Diffstat (limited to 'drivers/char/tpm/eventlog')
| -rw-r--r-- | drivers/char/tpm/eventlog/acpi.c | 113 | ||||
| -rw-r--r-- | drivers/char/tpm/eventlog/common.c | 194 | ||||
| -rw-r--r-- | drivers/char/tpm/eventlog/common.h | 35 | ||||
| -rw-r--r-- | drivers/char/tpm/eventlog/efi.c | 71 | ||||
| -rw-r--r-- | drivers/char/tpm/eventlog/of.c | 81 | ||||
| -rw-r--r-- | drivers/char/tpm/eventlog/tpm1.c | 310 | ||||
| -rw-r--r-- | drivers/char/tpm/eventlog/tpm2.c | 210 |
7 files changed, 1014 insertions, 0 deletions
diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c new file mode 100644 index 000000000..7c53b1973 --- /dev/null +++ b/drivers/char/tpm/eventlog/acpi.c @@ -0,0 +1,113 @@ +/* + * 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> + * Nayna Jain <nayna@linux.vnet.ibm.com> + * + * Maintained by: <tpmdd-devel@lists.sourceforge.net> + * + * Access to the event log 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 <linux/acpi.h> +#include <linux/tpm_eventlog.h> + +#include "../tpm.h" +#include "common.h" + +struct acpi_tcpa { + struct acpi_table_header hdr; + u16 platform_class; + union { + struct client_hdr { + u32 log_max_len __packed; + u64 log_start_addr __packed; + } client; + struct server_hdr { + u16 reserved; + u64 log_max_len __packed; + u64 log_start_addr __packed; + } server; + }; +}; + +/* read binary bios log */ +int tpm_read_log_acpi(struct tpm_chip *chip) +{ + struct acpi_tcpa *buff; + acpi_status status; + void __iomem *virt; + u64 len, start; + struct tpm_bios_log *log; + + if (chip->flags & TPM_CHIP_FLAG_TPM2) + return -ENODEV; + + log = &chip->log; + + /* Unfortuntely ACPI does not associate the event log with a specific + * TPM, like PPI. Thus all ACPI TPMs will read the same log. + */ + if (!chip->acpi_dev_handle) + return -ENODEV; + + /* 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)) + return -ENODEV; + + 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) { + dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__); + return -EIO; + } + + /* malloc EventLog space */ + log->bios_event_log = kmalloc(len, GFP_KERNEL); + if (!log->bios_event_log) + return -ENOMEM; + + log->bios_event_log_end = log->bios_event_log + len; + + virt = acpi_os_map_iomem(start, len); + if (!virt) + goto err; + + memcpy_fromio(log->bios_event_log, virt, len); + + acpi_os_unmap_iomem(virt, len); + return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; + +err: + kfree(log->bios_event_log); + log->bios_event_log = NULL; + return -EIO; + +} diff --git a/drivers/char/tpm/eventlog/common.c b/drivers/char/tpm/eventlog/common.c new file mode 100644 index 000000000..462476467 --- /dev/null +++ b/drivers/char/tpm/eventlog/common.c @@ -0,0 +1,194 @@ +/* + * Copyright (C) 2005, 2012 IBM Corporation + * + * Authors: + * Kent Yoder <key@linux.vnet.ibm.com> + * Seiji Munetoh <munetoh@jp.ibm.com> + * Stefan Berger <stefanb@us.ibm.com> + * Reiner Sailer <sailer@watson.ibm.com> + * Kylene Hall <kjhall@us.ibm.com> + * Nayna Jain <nayna@linux.vnet.ibm.com> + * + * Access to the event log created by a system's firmware / BIOS + * + * 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/tpm_eventlog.h> + +#include "../tpm.h" +#include "common.h" + +static int tpm_bios_measurements_open(struct inode *inode, + struct file *file) +{ + int err; + struct seq_file *seq; + struct tpm_chip_seqops *chip_seqops; + const struct seq_operations *seqops; + struct tpm_chip *chip; + + inode_lock(inode); + if (!inode->i_private) { + inode_unlock(inode); + return -ENODEV; + } + chip_seqops = (struct tpm_chip_seqops *)inode->i_private; + seqops = chip_seqops->seqops; + chip = chip_seqops->chip; + get_device(&chip->dev); + inode_unlock(inode); + + /* now register seq file */ + err = seq_open(file, seqops); + if (!err) { + seq = file->private_data; + seq->private = chip; + } + + return err; +} + +static int tpm_bios_measurements_release(struct inode *inode, + struct file *file) +{ + struct seq_file *seq = (struct seq_file *)file->private_data; + struct tpm_chip *chip = (struct tpm_chip *)seq->private; + + put_device(&chip->dev); + + return seq_release(inode, file); +} + +static const struct file_operations tpm_bios_measurements_ops = { + .owner = THIS_MODULE, + .open = tpm_bios_measurements_open, + .read = seq_read, + .llseek = seq_lseek, + .release = tpm_bios_measurements_release, +}; + +static int tpm_read_log(struct tpm_chip *chip) +{ + int rc; + + if (chip->log.bios_event_log != NULL) { + dev_dbg(&chip->dev, + "%s: ERROR - event log already initialized\n", + __func__); + return -EFAULT; + } + + rc = tpm_read_log_acpi(chip); + if (rc != -ENODEV) + return rc; + + rc = tpm_read_log_efi(chip); + if (rc != -ENODEV) + return rc; + + return tpm_read_log_of(chip); +} + +/* + * tpm_bios_log_setup() - Read the event log from the firmware + * @chip: TPM chip to use. + * + * If an event log is found then the securityfs files are setup to + * export it to userspace, otherwise nothing is done. + */ +void tpm_bios_log_setup(struct tpm_chip *chip) +{ + const char *name = dev_name(&chip->dev); + unsigned int cnt; + int log_version; + int rc = 0; + + if (chip->flags & TPM_CHIP_FLAG_VIRTUAL) + return; + + rc = tpm_read_log(chip); + if (rc < 0) + return; + log_version = rc; + + cnt = 0; + chip->bios_dir[cnt] = securityfs_create_dir(name, NULL); + /* NOTE: securityfs_create_dir can return ENODEV if securityfs is + * compiled out. The caller should ignore the ENODEV return code. + */ + if (IS_ERR(chip->bios_dir[cnt])) + goto err; + cnt++; + + chip->bin_log_seqops.chip = chip; + if (log_version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) + chip->bin_log_seqops.seqops = + &tpm2_binary_b_measurements_seqops; + else + chip->bin_log_seqops.seqops = + &tpm1_binary_b_measurements_seqops; + + + chip->bios_dir[cnt] = + securityfs_create_file("binary_bios_measurements", + 0440, chip->bios_dir[0], + (void *)&chip->bin_log_seqops, + &tpm_bios_measurements_ops); + if (IS_ERR(chip->bios_dir[cnt])) + goto err; + cnt++; + + if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) { + + chip->ascii_log_seqops.chip = chip; + chip->ascii_log_seqops.seqops = + &tpm1_ascii_b_measurements_seqops; + + chip->bios_dir[cnt] = + securityfs_create_file("ascii_bios_measurements", + 0440, chip->bios_dir[0], + (void *)&chip->ascii_log_seqops, + &tpm_bios_measurements_ops); + if (IS_ERR(chip->bios_dir[cnt])) + goto err; + cnt++; + } + + return; + +err: + chip->bios_dir[cnt] = NULL; + tpm_bios_log_teardown(chip); + return; +} + +void tpm_bios_log_teardown(struct tpm_chip *chip) +{ + int i; + struct inode *inode; + + /* securityfs_remove currently doesn't take care of handling sync + * between removal and opening of pseudo files. To handle this, a + * workaround is added by making i_private = NULL here during removal + * and to check it during open(), both within inode_lock()/unlock(). + * This design ensures that open() either safely gets kref or fails. + */ + for (i = (TPM_NUM_EVENT_LOG_FILES - 1); i >= 0; i--) { + if (chip->bios_dir[i]) { + inode = d_inode(chip->bios_dir[i]); + inode_lock(inode); + inode->i_private = NULL; + inode_unlock(inode); + securityfs_remove(chip->bios_dir[i]); + } + } +} diff --git a/drivers/char/tpm/eventlog/common.h b/drivers/char/tpm/eventlog/common.h new file mode 100644 index 000000000..47ff8136c --- /dev/null +++ b/drivers/char/tpm/eventlog/common.h @@ -0,0 +1,35 @@ +#ifndef __TPM_EVENTLOG_COMMON_H__ +#define __TPM_EVENTLOG_COMMON_H__ + +#include "../tpm.h" + +extern const struct seq_operations tpm1_ascii_b_measurements_seqops; +extern const struct seq_operations tpm1_binary_b_measurements_seqops; +extern const struct seq_operations tpm2_binary_b_measurements_seqops; + +#if defined(CONFIG_ACPI) +int tpm_read_log_acpi(struct tpm_chip *chip); +#else +static inline int tpm_read_log_acpi(struct tpm_chip *chip) +{ + return -ENODEV; +} +#endif +#if defined(CONFIG_OF) +int tpm_read_log_of(struct tpm_chip *chip); +#else +static inline int tpm_read_log_of(struct tpm_chip *chip) +{ + return -ENODEV; +} +#endif +#if defined(CONFIG_EFI) +int tpm_read_log_efi(struct tpm_chip *chip); +#else +static inline int tpm_read_log_efi(struct tpm_chip *chip) +{ + return -ENODEV; +} +#endif + +#endif diff --git a/drivers/char/tpm/eventlog/efi.c b/drivers/char/tpm/eventlog/efi.c new file mode 100644 index 000000000..abd3beeb5 --- /dev/null +++ b/drivers/char/tpm/eventlog/efi.c @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2017 Google + * + * Authors: + * Thiebaud Weksteen <tweek@google.com> + * + * 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/efi.h> +#include <linux/tpm_eventlog.h> + +#include "../tpm.h" +#include "common.h" + +/* read binary bios log from EFI configuration table */ +int tpm_read_log_efi(struct tpm_chip *chip) +{ + + struct linux_efi_tpm_eventlog *log_tbl; + struct tpm_bios_log *log; + u32 log_size; + u8 tpm_log_version; + + if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) + return -ENODEV; + + if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) + return -ENODEV; + + log = &chip->log; + + log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl), MEMREMAP_WB); + if (!log_tbl) { + pr_err("Could not map UEFI TPM log table !\n"); + return -ENOMEM; + } + + log_size = log_tbl->size; + memunmap(log_tbl); + + if (!log_size) { + pr_warn("UEFI TPM log area empty\n"); + return -EIO; + } + + log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl) + log_size, + MEMREMAP_WB); + if (!log_tbl) { + pr_err("Could not map UEFI TPM log table payload!\n"); + return -ENOMEM; + } + + /* malloc EventLog space */ + log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL); + if (!log->bios_event_log) + goto err_memunmap; + log->bios_event_log_end = log->bios_event_log + log_size; + + tpm_log_version = log_tbl->version; + memunmap(log_tbl); + return tpm_log_version; + +err_memunmap: + memunmap(log_tbl); + return -ENOMEM; +} diff --git a/drivers/char/tpm/eventlog/of.c b/drivers/char/tpm/eventlog/of.c new file mode 100644 index 000000000..bba5fba6c --- /dev/null +++ b/drivers/char/tpm/eventlog/of.c @@ -0,0 +1,81 @@ +/* + * Copyright 2012 IBM Corporation + * + * Author: Ashley Lai <ashleydlai@gmail.com> + * Nayna Jain <nayna@linux.vnet.ibm.com> + * + * Maintained by: <tpmdd-devel@lists.sourceforge.net> + * + * Read the event log created by the firmware on PPC64 + * + * 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/slab.h> +#include <linux/of.h> +#include <linux/tpm_eventlog.h> + +#include "../tpm.h" +#include "common.h" + +int tpm_read_log_of(struct tpm_chip *chip) +{ + struct device_node *np; + const u32 *sizep; + const u64 *basep; + struct tpm_bios_log *log; + u32 size; + u64 base; + + log = &chip->log; + if (chip->dev.parent && chip->dev.parent->of_node) + np = chip->dev.parent->of_node; + else + return -ENODEV; + + if (of_property_read_bool(np, "powered-while-suspended")) + chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; + + sizep = of_get_property(np, "linux,sml-size", NULL); + basep = of_get_property(np, "linux,sml-base", NULL); + if (sizep == NULL && basep == NULL) + return -ENODEV; + if (sizep == NULL || basep == NULL) + return -EIO; + + /* + * For both vtpm/tpm, firmware has log addr and log size in big + * endian format. But in case of vtpm, there is a method called + * sml-handover which is run during kernel init even before + * device tree is setup. This sml-handover function takes care + * of endianness and writes to sml-base and sml-size in little + * endian format. For this reason, vtpm doesn't need conversion + * but physical tpm needs the conversion. + */ + if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0) { + size = be32_to_cpup((__force __be32 *)sizep); + base = be64_to_cpup((__force __be64 *)basep); + } else { + size = *sizep; + base = *basep; + } + + if (size == 0) { + dev_warn(&chip->dev, "%s: Event log area empty\n", __func__); + return -EIO; + } + + log->bios_event_log = kmemdup(__va(base), size, GFP_KERNEL); + if (!log->bios_event_log) + return -ENOMEM; + + log->bios_event_log_end = log->bios_event_log + size; + + if (chip->flags & TPM_CHIP_FLAG_TPM2) + return EFI_TCG2_EVENT_LOG_FORMAT_TCG_2; + return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; +} diff --git a/drivers/char/tpm/eventlog/tpm1.c b/drivers/char/tpm/eventlog/tpm1.c new file mode 100644 index 000000000..a4621c83e --- /dev/null +++ b/drivers/char/tpm/eventlog/tpm1.c @@ -0,0 +1,310 @@ +/* + * Copyright (C) 2005, 2012 IBM Corporation + * + * Authors: + * Kent Yoder <key@linux.vnet.ibm.com> + * Seiji Munetoh <munetoh@jp.ibm.com> + * Stefan Berger <stefanb@us.ibm.com> + * Reiner Sailer <sailer@watson.ibm.com> + * Kylene Hall <kjhall@us.ibm.com> + * Nayna Jain <nayna@linux.vnet.ibm.com> + * + * Maintained by: <tpmdd-devel@lists.sourceforge.net> + * + * Access to the event log created by a system's firmware / BIOS + * + * 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/efi.h> +#include <linux/fs.h> +#include <linux/security.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/tpm_eventlog.h> + +#include "../tpm.h" +#include "common.h" + + +static const char* tcpa_event_type_strings[] = { + "PREBOOT", + "POST CODE", + "", + "NO ACTION", + "SEPARATOR", + "ACTION", + "EVENT TAG", + "S-CRTM Contents", + "S-CRTM Version", + "CPU Microcode", + "Platform Config Flags", + "Table of Devices", + "Compact Hash", + "IPL", + "IPL Partition Data", + "Non-Host Code", + "Non-Host Config", + "Non-Host Info" +}; + +static const char* tcpa_pc_event_id_strings[] = { + "", + "SMBIOS", + "BIS Certificate", + "POST BIOS ", + "ESCD ", + "CMOS", + "NVRAM", + "Option ROM", + "Option ROM config", + "", + "Option ROM microcode ", + "S-CRTM Version", + "S-CRTM Contents ", + "POST Contents ", + "Table of Devices", +}; + +/* returns pointer to start of pos. entry of tcg log */ +static void *tpm1_bios_measurements_start(struct seq_file *m, loff_t *pos) +{ + loff_t i; + struct tpm_chip *chip = m->private; + struct tpm_bios_log *log = &chip->log; + void *addr = log->bios_event_log; + void *limit = log->bios_event_log_end; + struct tcpa_event *event; + u32 converted_event_size; + u32 converted_event_type; + + + /* read over *pos measurements */ + for (i = 0; i < *pos; i++) { + event = addr; + + converted_event_size = + do_endian_conversion(event->event_size); + converted_event_type = + do_endian_conversion(event->event_type); + + if ((addr + sizeof(struct tcpa_event)) < limit) { + if ((converted_event_type == 0) && + (converted_event_size == 0)) + return NULL; + addr += (sizeof(struct tcpa_event) + + converted_event_size); + } + } + + /* now check if current entry is valid */ + if ((addr + sizeof(struct tcpa_event)) >= limit) + return NULL; + + event = addr; + + converted_event_size = do_endian_conversion(event->event_size); + converted_event_type = do_endian_conversion(event->event_type); + + if (((converted_event_type == 0) && (converted_event_size == 0)) + || ((addr + sizeof(struct tcpa_event) + converted_event_size) + >= limit)) + return NULL; + + return addr; +} + +static void *tpm1_bios_measurements_next(struct seq_file *m, void *v, + loff_t *pos) +{ + struct tcpa_event *event = v; + struct tpm_chip *chip = m->private; + struct tpm_bios_log *log = &chip->log; + void *limit = log->bios_event_log_end; + u32 converted_event_size; + u32 converted_event_type; + + (*pos)++; + converted_event_size = do_endian_conversion(event->event_size); + + v += sizeof(struct tcpa_event) + converted_event_size; + + /* now check if current entry is valid */ + if ((v + sizeof(struct tcpa_event)) >= limit) + return NULL; + + event = v; + + converted_event_size = do_endian_conversion(event->event_size); + converted_event_type = do_endian_conversion(event->event_type); + + if (((converted_event_type == 0) && (converted_event_size == 0)) || + ((v + sizeof(struct tcpa_event) + converted_event_size) >= limit)) + return NULL; + + return v; +} + +static void tpm1_bios_measurements_stop(struct seq_file *m, void *v) +{ +} + +static int get_event_name(char *dest, struct tcpa_event *event, + unsigned char * event_entry) +{ + const char *name = ""; + /* 41 so there is room for 40 data and 1 nul */ + char data[41] = ""; + int i, n_len = 0, d_len = 0; + struct tcpa_pc_event *pc_event; + + switch (do_endian_conversion(event->event_type)) { + case PREBOOT: + case POST_CODE: + case UNUSED: + case NO_ACTION: + case SCRTM_CONTENTS: + case SCRTM_VERSION: + case CPU_MICROCODE: + case PLATFORM_CONFIG_FLAGS: + case TABLE_OF_DEVICES: + case COMPACT_HASH: + case IPL: + case IPL_PARTITION_DATA: + case NONHOST_CODE: + case NONHOST_CONFIG: + case NONHOST_INFO: + name = tcpa_event_type_strings[do_endian_conversion + (event->event_type)]; + n_len = strlen(name); + break; + case SEPARATOR: + case ACTION: + if (MAX_TEXT_EVENT > + do_endian_conversion(event->event_size)) { + name = event_entry; + n_len = do_endian_conversion(event->event_size); + } + break; + case EVENT_TAG: + pc_event = (struct tcpa_pc_event *)event_entry; + + /* ToDo Row data -> Base64 */ + + switch (do_endian_conversion(pc_event->event_id)) { + case SMBIOS: + case BIS_CERT: + case CMOS: + case NVRAM: + case OPTION_ROM_EXEC: + case OPTION_ROM_CONFIG: + case S_CRTM_VERSION: + name = tcpa_pc_event_id_strings[do_endian_conversion + (pc_event->event_id)]; + n_len = strlen(name); + break; + /* hash data */ + case POST_BIOS_ROM: + case ESCD: + case OPTION_ROM_MICROCODE: + case S_CRTM_CONTENTS: + case POST_CONTENTS: + name = tcpa_pc_event_id_strings[do_endian_conversion + (pc_event->event_id)]; + n_len = strlen(name); + for (i = 0; i < 20; i++) + d_len += sprintf(&data[2*i], "%02x", + pc_event->event_data[i]); + break; + default: + break; + } + default: + break; + } + + return snprintf(dest, MAX_TEXT_EVENT, "[%.*s%.*s]", + n_len, name, d_len, data); + +} + +static int tpm1_binary_bios_measurements_show(struct seq_file *m, void *v) +{ + struct tcpa_event *event = v; + struct tcpa_event temp_event; + char *temp_ptr; + int i; + + memcpy(&temp_event, event, sizeof(struct tcpa_event)); + + /* convert raw integers for endianness */ + temp_event.pcr_index = do_endian_conversion(event->pcr_index); + temp_event.event_type = do_endian_conversion(event->event_type); + temp_event.event_size = do_endian_conversion(event->event_size); + + temp_ptr = (char *) &temp_event; + + for (i = 0; i < (sizeof(struct tcpa_event) - 1) ; i++) + seq_putc(m, temp_ptr[i]); + + temp_ptr = (char *) v; + + for (i = (sizeof(struct tcpa_event) - 1); + i < (sizeof(struct tcpa_event) + temp_event.event_size); i++) + seq_putc(m, temp_ptr[i]); + + return 0; + +} + +static int tpm1_ascii_bios_measurements_show(struct seq_file *m, void *v) +{ + int len = 0; + char *eventname; + struct tcpa_event *event = v; + unsigned char *event_entry = + (unsigned char *)(v + sizeof(struct tcpa_event)); + + eventname = kmalloc(MAX_TEXT_EVENT, GFP_KERNEL); + if (!eventname) { + printk(KERN_ERR "%s: ERROR - No Memory for event name\n ", + __func__); + return -EFAULT; + } + + /* 1st: PCR */ + seq_printf(m, "%2d ", do_endian_conversion(event->pcr_index)); + + /* 2nd: SHA1 */ + seq_printf(m, "%20phN", event->pcr_value); + + /* 3rd: event type identifier */ + seq_printf(m, " %02x", do_endian_conversion(event->event_type)); + + len += get_event_name(eventname, event, event_entry); + + /* 4th: eventname <= max + \'0' delimiter */ + seq_printf(m, " %s\n", eventname); + + kfree(eventname); + return 0; +} + +const struct seq_operations tpm1_ascii_b_measurements_seqops = { + .start = tpm1_bios_measurements_start, + .next = tpm1_bios_measurements_next, + .stop = tpm1_bios_measurements_stop, + .show = tpm1_ascii_bios_measurements_show, +}; + +const struct seq_operations tpm1_binary_b_measurements_seqops = { + .start = tpm1_bios_measurements_start, + .next = tpm1_bios_measurements_next, + .stop = tpm1_bios_measurements_stop, + .show = tpm1_binary_bios_measurements_show, +}; diff --git a/drivers/char/tpm/eventlog/tpm2.c b/drivers/char/tpm/eventlog/tpm2.c new file mode 100644 index 000000000..aec49c925 --- /dev/null +++ b/drivers/char/tpm/eventlog/tpm2.c @@ -0,0 +1,210 @@ +/* + * Copyright (C) 2016 IBM Corporation + * + * Authors: + * Nayna Jain <nayna@linux.vnet.ibm.com> + * + * Access to TPM 2.0 event log as written by Firmware. + * It assumes that writer of event log has followed TCG Specification + * for Family "2.0" and written the event data in little endian. + * With that, it doesn't need any endian conversion for structure + * content. + * + * 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 <linux/tpm_eventlog.h> + +#include "../tpm.h" +#include "common.h" + +/* + * calc_tpm2_event_size() - calculate the event size, where event + * is an entry in the TPM 2.0 event log. The event is of type Crypto + * Agile Log Entry Format as defined in TCG EFI Protocol Specification + * Family "2.0". + + * @event: event whose size is to be calculated. + * @event_header: the first event in the event log. + * + * Returns size of the event. If it is an invalid event, returns 0. + */ +static size_t calc_tpm2_event_size(struct tcg_pcr_event2 *event, + struct tcg_pcr_event *event_header) +{ + struct tcg_efi_specid_event *efispecid; + struct tcg_event_field *event_field; + void *marker; + void *marker_start; + u32 halg_size; + size_t size; + u16 halg; + int i; + int j; + + marker = event; + marker_start = marker; + marker = marker + sizeof(event->pcr_idx) + sizeof(event->event_type) + + sizeof(event->count); + + efispecid = (struct tcg_efi_specid_event *)event_header->event; + + /* Check if event is malformed. */ + if (event->count > efispecid->num_algs) + return 0; + + for (i = 0; i < event->count; i++) { + halg_size = sizeof(event->digests[i].alg_id); + memcpy(&halg, marker, halg_size); + marker = marker + halg_size; + for (j = 0; j < efispecid->num_algs; j++) { + if (halg == efispecid->digest_sizes[j].alg_id) { + marker += + efispecid->digest_sizes[j].digest_size; + break; + } + } + /* Algorithm without known length. Such event is unparseable. */ + if (j == efispecid->num_algs) + return 0; + } + + event_field = (struct tcg_event_field *)marker; + marker = marker + sizeof(event_field->event_size) + + event_field->event_size; + size = marker - marker_start; + + if ((event->event_type == 0) && (event_field->event_size == 0)) + return 0; + + return size; +} + +static void *tpm2_bios_measurements_start(struct seq_file *m, loff_t *pos) +{ + struct tpm_chip *chip = m->private; + struct tpm_bios_log *log = &chip->log; + void *addr = log->bios_event_log; + void *limit = log->bios_event_log_end; + struct tcg_pcr_event *event_header; + struct tcg_pcr_event2 *event; + size_t size; + int i; + + event_header = addr; + size = sizeof(struct tcg_pcr_event) - sizeof(event_header->event) + + event_header->event_size; + + if (*pos == 0) { + if (addr + size < limit) { + if ((event_header->event_type == 0) && + (event_header->event_size == 0)) + return NULL; + return SEQ_START_TOKEN; + } + } + + if (*pos > 0) { + addr += size; + event = addr; + size = calc_tpm2_event_size(event, event_header); + if ((addr + size >= limit) || (size == 0)) + return NULL; + } + + for (i = 0; i < (*pos - 1); i++) { + event = addr; + size = calc_tpm2_event_size(event, event_header); + + if ((addr + size >= limit) || (size == 0)) + return NULL; + addr += size; + } + + return addr; +} + +static void *tpm2_bios_measurements_next(struct seq_file *m, void *v, + loff_t *pos) +{ + struct tcg_pcr_event *event_header; + struct tcg_pcr_event2 *event; + struct tpm_chip *chip = m->private; + struct tpm_bios_log *log = &chip->log; + void *limit = log->bios_event_log_end; + size_t event_size; + void *marker; + + (*pos)++; + event_header = log->bios_event_log; + + if (v == SEQ_START_TOKEN) { + event_size = sizeof(struct tcg_pcr_event) - + sizeof(event_header->event) + event_header->event_size; + marker = event_header; + } else { + event = v; + event_size = calc_tpm2_event_size(event, event_header); + if (event_size == 0) + return NULL; + marker = event; + } + + marker = marker + event_size; + if (marker >= limit) + return NULL; + v = marker; + event = v; + + event_size = calc_tpm2_event_size(event, event_header); + if (((v + event_size) >= limit) || (event_size == 0)) + return NULL; + + return v; +} + +static void tpm2_bios_measurements_stop(struct seq_file *m, void *v) +{ +} + +static int tpm2_binary_bios_measurements_show(struct seq_file *m, void *v) +{ + struct tpm_chip *chip = m->private; + struct tpm_bios_log *log = &chip->log; + struct tcg_pcr_event *event_header = log->bios_event_log; + struct tcg_pcr_event2 *event = v; + void *temp_ptr; + size_t size; + + if (v == SEQ_START_TOKEN) { + size = sizeof(struct tcg_pcr_event) - + sizeof(event_header->event) + event_header->event_size; + + temp_ptr = event_header; + + if (size > 0) + seq_write(m, temp_ptr, size); + } else { + size = calc_tpm2_event_size(event, event_header); + temp_ptr = event; + if (size > 0) + seq_write(m, temp_ptr, size); + } + + return 0; +} + +const struct seq_operations tpm2_binary_b_measurements_seqops = { + .start = tpm2_bios_measurements_start, + .next = tpm2_bios_measurements_next, + .stop = tpm2_bios_measurements_stop, + .show = tpm2_binary_bios_measurements_show, +}; |