v4.19.13 snapshot.
diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c
new file mode 100644
index 0000000..7c53b19
--- /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 0000000..5a8720d
--- /dev/null
+++ b/drivers/char/tpm/eventlog/common.c
@@ -0,0 +1,195 @@
+/*
+ * 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.
+ *
+ * Returns -ENODEV if the firmware has no event log or securityfs is not
+ * supported.
+ */
+int tpm_bios_log_setup(struct tpm_chip *chip)
+{
+ const char *name = dev_name(&chip->dev);
+ unsigned int cnt;
+ int log_version;
+ int rc = 0;
+
+ rc = tpm_read_log(chip);
+ if (rc < 0)
+ return rc;
+ 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 0;
+
+err:
+ rc = PTR_ERR(chip->bios_dir[cnt]);
+ chip->bios_dir[cnt] = NULL;
+ tpm_bios_log_teardown(chip);
+ return rc;
+}
+
+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 0000000..47ff813
--- /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 0000000..3e673ab
--- /dev/null
+++ b/drivers/char/tpm/eventlog/efi.c
@@ -0,0 +1,66 @@
+/*
+ * 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);
+
+ 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 0000000..bba5fba
--- /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 0000000..58c8478
--- /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;
+
+ 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;
+
+ (*pos)++;
+ 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 0000000..1b8fa9d
--- /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 int 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;
+
+ 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;
+
+ (*pos)++;
+ 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,
+};