[PATCH 0/2] Cover Letter - TPM2.0: Add securityfs support for

[PATCH 0/2] Cover Letter - TPM2.0: Add securityfs support for

[Nayna Jain]

Overview:
=========
Patch adds support for enabling securityfs for TPM2.0.
The patch currently adds support for only binary_bios_measurements.

The structure for TPM2.0 is compliant with TCG Spec for 2.0 family.
Also , the reading of data has the assumption that writer would have
followed TCG Spec and so everything is in little-endian.

The tpm device driver code has been refactored to:
* Identify the TPM version - 1.2 or 2.0
* Calls corresponding compatible seq_ops for iterating over eventlog.

Files Description:
===================

* tpm-chip.c : Adds call to setup bios log for TPM2.0.

* tpm2_of.c : Reads the device tree entries to find the location
and size of event.

* tpm_eventlog_init.c : Provides common initialization functions
 between TPM2.0 and TPM1.2 to setup securityfs entries and seq_ops
 iterator.  The functions has been moved from tpm_eventlog.c into this file.

* tpm_eventlog.c : Provides functions only specific to TPM1.2
version. Common initialization functions are moved to tpm_eventlog_init.c

* tpm2_eventlog.c : Provides functions specific only for TPM2.0
eventlog format.

* tpm2.h : Header file for TPM2.0 structures and functions.

Nayna Jain (2):
  TPM2.0: Refactor eventlog methods.
  TPM2.0:Adds securityfs support for TPM2.0 eventlog

 drivers/char/tpm/Makefile            |   8 +-
 drivers/char/tpm/tpm-chip.c          |  20 ++--
 drivers/char/tpm/tpm2.h              |  75 ++++++++++++
 drivers/char/tpm/tpm2_eventlog.c     | 224 +++++++++++++++++++++++++++++++++++
 drivers/char/tpm/tpm2_of.c           |  77 ++++++++++++
 drivers/char/tpm/tpm_eventlog.c      | 156 +-----------------------
 drivers/char/tpm/tpm_eventlog.h      |  13 +-
 drivers/char/tpm/tpm_eventlog_init.c | 216 +++++++++++++++++++++++++++++++++
 8 files changed, 617 insertions(+), 172 deletions(-)
 create mode 100644 drivers/char/tpm/tpm2.h
 create mode 100644 drivers/char/tpm/tpm2_eventlog.c
 create mode 100644 drivers/char/tpm/tpm2_of.c
 create mode 100644 drivers/char/tpm/tpm_eventlog_init.c

-- 
2.5.0


------------------------------------------------------------------------------

[PATCH 1/2] TPM2.0: Refactor eventlog init functions for TPM1.2 and

[Nayna Jain]

Refactored eventlog.c file into tpm_eventlog.c and tpm_eventlog_init.c

Breakdown is:

* tpm_eventlog_init.c : Moved eventlog initialization methods like
to setup securityfs, to open and release seqfile from tpm_eventlog.c
to this file. This is to keep the logic of initialization for TPM1.2
and TPM2.0 in common file.

* tpm_eventlog.c : This file now has only methods specific to parsing
and iterate TPM1.2 entry log formats. It can understand only TPM1.2
and is called by methods in tpm_eventlog_init if identified TPM device
is TPM1.2.

Signed-off-by: Nayna Jain <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
---
 drivers/char/tpm/Makefile            |   4 +-
 drivers/char/tpm/tpm_eventlog.c      | 156 +----------------------------
 drivers/char/tpm/tpm_eventlog.h      |   3 +
 drivers/char/tpm/tpm_eventlog_init.c | 183 +++++++++++++++++++++++++++++++++++
 4 files changed, 192 insertions(+), 154 deletions(-)
 create mode 100644 drivers/char/tpm/tpm_eventlog_init.c

diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index a385fb8..9136762 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -6,10 +6,10 @@ tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o
 tpm-$(CONFIG_ACPI) += tpm_ppi.o
 
 ifdef CONFIG_ACPI
-	tpm-y += tpm_eventlog.o tpm_acpi.o
+	tpm-y += tpm_eventlog_init.o tpm_eventlog.o tpm_acpi.o
 else
 ifdef CONFIG_TCG_IBMVTPM
-	tpm-y += tpm_eventlog.o tpm_of.o
+	tpm-y += tpm_eventlog_init.o tpm_eventlog.o tpm_of.o
 endif
 endif
 obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o
diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c
index e722886..b8f22ec 100644
--- a/drivers/char/tpm/tpm_eventlog.c
+++ b/drivers/char/tpm/tpm_eventlog.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005, 2012 IBM Corporation
+ * Copyright (C) 2005, 2012, 2016 IBM Corporation
  *
  * Authors:
  *	Kent Yoder <key-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
@@ -11,6 +11,7 @@
  * Maintained by: <tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
  *
  * Access to the eventlog created by a system's firmware / BIOS
+ * specific to TPM 1.2.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -257,20 +258,6 @@ static int tpm_binary_bios_measurements_show(struct seq_file *m, void *v)
 
 }
 
-static int tpm_bios_measurements_release(struct inode *inode,
-					 struct file *file)
-{
-	struct seq_file *seq = file->private_data;
-	struct tpm_bios_log *log = seq->private;
-
-	if (log) {
-		kfree(log->bios_event_log);
-		kfree(log);
-	}
-
-	return seq_release(inode, file);
-}
-
 static int tpm_ascii_bios_measurements_show(struct seq_file *m, void *v)
 {
 	int len = 0;
@@ -304,151 +291,16 @@ static int tpm_ascii_bios_measurements_show(struct seq_file *m, void *v)
 	return 0;
 }
 
-static const struct seq_operations tpm_ascii_b_measurments_seqops = {
+const struct seq_operations tpm_ascii_b_measurments_seqops = {
 	.start = tpm_bios_measurements_start,
 	.next = tpm_bios_measurements_next,
 	.stop = tpm_bios_measurements_stop,
 	.show = tpm_ascii_bios_measurements_show,
 };
 
-static const struct seq_operations tpm_binary_b_measurments_seqops = {
+const struct seq_operations tpm_binary_b_measurments_seqops = {
 	.start = tpm_bios_measurements_start,
 	.next = tpm_bios_measurements_next,
 	.stop = tpm_bios_measurements_stop,
 	.show = tpm_binary_bios_measurements_show,
 };
-
-static int tpm_ascii_bios_measurements_open(struct inode *inode,
-					    struct file *file)
-{
-	int err;
-	struct tpm_bios_log *log;
-	struct seq_file *seq;
-
-	log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
-	if (!log)
-		return -ENOMEM;
-
-	if ((err = read_log(log)))
-		goto out_free;
-
-	/* now register seq file */
-	err = seq_open(file, &tpm_ascii_b_measurments_seqops);
-	if (!err) {
-		seq = file->private_data;
-		seq->private = log;
-	} else {
-		goto out_free;
-	}
-
-out:
-	return err;
-out_free:
-	kfree(log->bios_event_log);
-	kfree(log);
-	goto out;
-}
-
-static const struct file_operations tpm_ascii_bios_measurements_ops = {
-	.open = tpm_ascii_bios_measurements_open,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = tpm_bios_measurements_release,
-};
-
-static int tpm_binary_bios_measurements_open(struct inode *inode,
-					     struct file *file)
-{
-	int err;
-	struct tpm_bios_log *log;
-	struct seq_file *seq;
-
-	log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
-	if (!log)
-		return -ENOMEM;
-
-	if ((err = read_log(log)))
-		goto out_free;
-
-	/* now register seq file */
-	err = seq_open(file, &tpm_binary_b_measurments_seqops);
-	if (!err) {
-		seq = file->private_data;
-		seq->private = log;
-	} else {
-		goto out_free;
-	}
-
-out:
-	return err;
-out_free:
-	kfree(log->bios_event_log);
-	kfree(log);
-	goto out;
-}
-
-static const struct file_operations tpm_binary_bios_measurements_ops = {
-	.open = tpm_binary_bios_measurements_open,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = tpm_bios_measurements_release,
-};
-
-static int is_bad(void *p)
-{
-	if (!p)
-		return 1;
-	if (IS_ERR(p) && (PTR_ERR(p) != -ENODEV))
-		return 1;
-	return 0;
-}
-
-struct dentry **tpm_bios_log_setup(const char *name)
-{
-	struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
-
-	tpm_dir = securityfs_create_dir(name, NULL);
-	if (is_bad(tpm_dir))
-		goto out;
-
-	bin_file =
-	    securityfs_create_file("binary_bios_measurements",
-				   S_IRUSR | S_IRGRP, tpm_dir, NULL,
-				   &tpm_binary_bios_measurements_ops);
-	if (is_bad(bin_file))
-		goto out_tpm;
-
-	ascii_file =
-	    securityfs_create_file("ascii_bios_measurements",
-				   S_IRUSR | S_IRGRP, tpm_dir, NULL,
-				   &tpm_ascii_bios_measurements_ops);
-	if (is_bad(ascii_file))
-		goto out_bin;
-
-	ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
-	if (!ret)
-		goto out_ascii;
-
-	ret[0] = ascii_file;
-	ret[1] = bin_file;
-	ret[2] = tpm_dir;
-
-	return ret;
-
-out_ascii:
-	securityfs_remove(ascii_file);
-out_bin:
-	securityfs_remove(bin_file);
-out_tpm:
-	securityfs_remove(tpm_dir);
-out:
-	return NULL;
-}
-
-void tpm_bios_log_teardown(struct dentry **lst)
-{
-	int i;
-
-	for (i = 0; i < 3; i++)
-		securityfs_remove(lst[i]);
-}
diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 8de62b0..37efac3 100644
--- a/drivers/char/tpm/tpm_eventlog.h
+++ b/drivers/char/tpm/tpm_eventlog.h
@@ -12,6 +12,9 @@
 #define do_endian_conversion(x) x
 #endif
 
+extern const struct seq_operations tpm_ascii_b_measurments_seqops;
+extern const struct seq_operations tpm_binary_b_measurments_seqops;
+
 enum bios_platform_class {
 	BIOS_CLIENT = 0x00,
 	BIOS_SERVER = 0x01,
diff --git a/drivers/char/tpm/tpm_eventlog_init.c b/drivers/char/tpm/tpm_eventlog_init.c
new file mode 100644
index 0000000..8153509
--- /dev/null
+++ b/drivers/char/tpm/tpm_eventlog_init.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright (C) 2005, 2012, 2016 IBM Corporation
+ *
+ * Authors:
+ *	Kent Yoder <key-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
+ *	Seiji Munetoh <munetoh-JE5g2YyFxFHQT0dZR+AlfA@public.gmane.org>
+ *	Stefan Berger <stefanb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
+ *	Reiner Sailer <sailer-aZOuKsOsJu3MbYB6QlFGEg@public.gmane.org>
+ *	Kylene Hall <kjhall-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
+ *	Nayna Jain <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
+ *
+ * Maintained by: <tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
+ *
+ * TPM 1.2 and TPM 2.0 common initialization methods to
+ * access the eventlog 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/slab.h>
+
+#include "tpm.h"
+#include "tpm_eventlog.h"
+
+
+static int tpm_bios_measurements_release(struct inode *inode,
+					 struct file *file)
+{
+	struct seq_file *seq = file->private_data;
+	struct tpm_bios_log *log = seq->private;
+
+	if (log) {
+		kfree(log->bios_event_log);
+		kfree(log);
+	}
+
+	return seq_release(inode, file);
+}
+
+static int tpm_ascii_bios_measurements_open(struct inode *inode,
+					    struct file *file)
+{
+	int err;
+	struct tpm_bios_log *log;
+	struct seq_file *seq;
+
+	log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
+	if (!log)
+		return -ENOMEM;
+
+	err = read_log(log);
+	if (err)
+		goto out_free;
+
+	/* now register seq file */
+	err = seq_open(file, &tpm_ascii_b_measurments_seqops);
+	if (!err) {
+		seq = file->private_data;
+		seq->private = log;
+	} else {
+		goto out_free;
+	}
+
+out:
+	return err;
+out_free:
+	kfree(log->bios_event_log);
+	kfree(log);
+	goto out;
+}
+
+static const struct file_operations tpm_ascii_bios_measurements_ops = {
+	.open = tpm_ascii_bios_measurements_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = tpm_bios_measurements_release,
+};
+
+static int tpm_binary_bios_measurements_open(struct inode *inode,
+					     struct file *file)
+{
+	int err;
+	struct tpm_bios_log *log;
+	struct seq_file *seq;
+
+	log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
+	if (!log)
+		return -ENOMEM;
+
+	err = read_log(log);
+	if (err)
+		goto out_free;
+
+	/* now register seq file */
+	err = seq_open(file, &tpm_binary_b_measurments_seqops);
+	if (!err) {
+		seq = file->private_data;
+		seq->private = log;
+	} else {
+		goto out_free;
+	}
+
+out:
+	return err;
+out_free:
+	kfree(log->bios_event_log);
+	kfree(log);
+	goto out;
+}
+
+static const struct file_operations tpm_binary_bios_measurements_ops = {
+	.open = tpm_binary_bios_measurements_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = tpm_bios_measurements_release,
+};
+
+static int is_bad(void *p)
+{
+	if (!p)
+		return 1;
+	if (IS_ERR(p) && (PTR_ERR(p) != -ENODEV))
+		return 1;
+	return 0;
+}
+
+struct dentry **tpm_bios_log_setup(const char *name)
+{
+	struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
+
+	tpm_dir = securityfs_create_dir(name, NULL);
+	if (is_bad(tpm_dir))
+		goto out;
+
+	bin_file =
+	    securityfs_create_file("binary_bios_measurements",
+				   S_IRUSR | S_IRGRP, tpm_dir, NULL,
+				   &tpm_binary_bios_measurements_ops);
+	if (is_bad(bin_file))
+		goto out_tpm;
+
+	ascii_file =
+	    securityfs_create_file("ascii_bios_measurements",
+				   S_IRUSR | S_IRGRP, tpm_dir, NULL,
+				   &tpm_ascii_bios_measurements_ops);
+	if (is_bad(ascii_file))
+		goto out_bin;
+
+	ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
+	if (!ret)
+		goto out_ascii;
+
+	ret[0] = ascii_file;
+	ret[1] = bin_file;
+	ret[2] = tpm_dir;
+
+	return ret;
+
+out_ascii:
+	securityfs_remove(ascii_file);
+out_bin:
+	securityfs_remove(bin_file);
+out_tpm:
+	securityfs_remove(tpm_dir);
+out:
+	return NULL;
+}
+
+void tpm_bios_log_teardown(struct dentry **lst)
+{
+	int i;
+
+	for (i = 0; i < 3; i++)
+		securityfs_remove(lst[i]);
+}
-- 
2.5.0


------------------------------------------------------------------------------

[PATCH 2/2] TPM2.0:Adds securityfs support for TPM2.0 eventlog

[Nayna Jain]

Adds securityfs support for TPM2.0.
This patch currently supports only binary_bios_measurements.

Signed-off-by: Nayna Jain <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
---
 drivers/char/tpm/Makefile            |   8 +-
 drivers/char/tpm/tpm-chip.c          |  20 ++--
 drivers/char/tpm/tpm2.h              |  75 ++++++++++++
 drivers/char/tpm/tpm2_eventlog.c     | 224 +++++++++++++++++++++++++++++++++++
 drivers/char/tpm/tpm2_of.c           |  77 ++++++++++++
 drivers/char/tpm/tpm_eventlog.h      |  10 +-
 drivers/char/tpm/tpm_eventlog_init.c |  71 ++++++++---
 7 files changed, 446 insertions(+), 39 deletions(-)
 create mode 100644 drivers/char/tpm/tpm2.h
 create mode 100644 drivers/char/tpm/tpm2_eventlog.c
 create mode 100644 drivers/char/tpm/tpm2_of.c

diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 9136762..3f4b8bc 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -6,10 +6,14 @@ tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o
 tpm-$(CONFIG_ACPI) += tpm_ppi.o
 
 ifdef CONFIG_ACPI
-	tpm-y += tpm_eventlog_init.o tpm_eventlog.o tpm_acpi.o
+	tpm-y += tpm_eventlog_init.o tpm2_eventlog.o tpm_eventlog.o tpm_acpi.o
 else
 ifdef CONFIG_TCG_IBMVTPM
-	tpm-y += tpm_eventlog_init.o tpm_eventlog.o tpm_of.o
+	tpm-y += tpm_eventlog_init.o tpm2_eventlog.o tpm_eventlog.o tpm_of.o
+else
+ifdef CONFIG_PPC64
+	tpm-y += tpm_eventlog_init.o tpm2_eventlog.o tpm_eventlog.o tpm2_of.o
+endif
 endif
 endif
 obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 5a2f043..57b2201 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -283,20 +283,9 @@ static int tpm1_chip_register(struct tpm_chip *chip)
 
 	tpm_sysfs_add_device(chip);
 
-	chip->bios_dir = tpm_bios_log_setup(dev_name(&chip->dev));
-
 	return 0;
 }
 
-static void tpm1_chip_unregister(struct tpm_chip *chip)
-{
-	if (chip->flags & TPM_CHIP_FLAG_TPM2)
-		return;
-
-	if (chip->bios_dir)
-		tpm_bios_log_teardown(chip->bios_dir);
-}
-
 static void tpm_del_legacy_sysfs(struct tpm_chip *chip)
 {
 	struct attribute **i;
@@ -358,11 +347,14 @@ int tpm_chip_register(struct tpm_chip *chip)
 	if (rc)
 		return rc;
 
+	chip->bios_dir = tpm_bios_log_setup(chip);
+
 	tpm_add_ppi(chip);
 
 	rc = tpm_add_char_device(chip);
 	if (rc) {
-		tpm1_chip_unregister(chip);
+		if (chip->bios_dir)
+			tpm_bios_log_teardown(chip);
 		return rc;
 	}
 
@@ -398,7 +390,9 @@ void tpm_chip_unregister(struct tpm_chip *chip)
 
 	tpm_del_legacy_sysfs(chip);
 
-	tpm1_chip_unregister(chip);
+	if (chip->bios_dir)
+		tpm_bios_log_teardown(chip);
+
 	tpm_del_char_device(chip);
 }
 EXPORT_SYMBOL_GPL(tpm_chip_unregister);
diff --git a/drivers/char/tpm/tpm2.h b/drivers/char/tpm/tpm2.h
new file mode 100644
index 0000000..0b1a871a
--- /dev/null
+++ b/drivers/char/tpm/tpm2.h
@@ -0,0 +1,75 @@
+#ifndef __TPM2_H__
+#define __TPM2_H__
+
+#define TPM_ALG_SHA1_DIGEST_SIZE	20
+#define TPM_ALG_SHA256_DIGEST_SIZE	32
+#define TPM_ALG_SHA384_DIGEST_SIZE	48
+
+#define HASH_COUNT	3
+#define MAX_TPM_LOG_MSG	128
+
+extern const struct seq_operations tpm2_binary_b_measurments_seqops;
+
+/* Event log header algorithm spec. */
+struct tcg_efispecideventalgorithmsize {
+	u16	algorithm_id;
+	u16	digest_size;
+} __packed;
+
+/* Event log header data. */
+struct tcg_efispecideventstruct {
+	u8					signature[16];
+	u32					platform_class;
+	u8					spec_version_minor;
+	u8					spec_version_major;
+	u8					spec_errata;
+	u8					uintnsize;
+	u32					num_algs;
+	struct tcg_efispecideventalgorithmsize	digest_sizes[HASH_COUNT];
+	u8					vendor_info_size;
+	u8					vendor_info[0];
+} __packed;
+
+/* Header entry for eventlog. */
+struct tcg_pcr_event {
+	u32	pcr_index;
+	u32	event_type;
+	u8	digest[20];
+	u32	event_size;
+	u8	event[MAX_TPM_LOG_MSG];
+} __packed;
+
+/* Digest union for crypto agility. */
+union tpmu_ha {
+	u8	 sha1[TPM_ALG_SHA1_DIGEST_SIZE];
+	u8	 sha256[TPM_ALG_SHA256_DIGEST_SIZE];
+	u8	 sha384[TPM_ALG_SHA384_DIGEST_SIZE];
+} __packed;
+
+/* Crypto Agile algorithm and respective digest. */
+struct tpmt_ha {
+	u16		algorithm_id;
+	union tpmu_ha	digest;
+} __packed;
+
+/* Crypto agile digests list. */
+struct tpml_digest_values {
+	u32		count;
+	struct tpmt_ha	digests[HASH_COUNT];
+} __packed;
+
+/* Event field structure. */
+struct tcg_event_field {
+	u32	event_size;
+	u8      event[MAX_TPM_LOG_MSG];
+} __packed;
+
+/* Crypto agile log entry format for TPM 2.0. */
+struct tcg_pcr_event2 {
+	u32				pcr_index;
+	u32				event_type;
+	struct tpml_digest_values	digests;
+	struct tcg_event_field		event;
+} __packed;
+
+#endif
diff --git a/drivers/char/tpm/tpm2_eventlog.c b/drivers/char/tpm/tpm2_eventlog.c
new file mode 100644
index 0000000..f1e8c4a
--- /dev/null
+++ b/drivers/char/tpm/tpm2_eventlog.c
@@ -0,0 +1,224 @@
+/*
+ * Copyright (C) 2016 IBM Corporation
+ *
+ * Authors:
+ *      Nayna Jain <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
+
+ * Access to TPM2.0 event log as written by Firmware.
+ * It assumes that writer of event log has followed TCG Spec 2.0
+ * has written the event struct 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 "tpm.h"
+#include "tpm2.h"
+#include "tpm_eventlog.h"
+
+
+static int calc_tpm2_event_size(struct tcg_pcr_event2 *event,
+		struct tcg_pcr_event *event_header)
+{
+	struct tcg_efispecideventstruct *efispecid;
+	struct tcg_event_field *event_field;
+	void *marker, *marker_start;
+	int j;
+	size_t size = 0;
+
+	/*
+	 * NOTE: TPM2.0 allows support for extend to multiple PCR Banks.
+	 * This implies that eventlog also has multiple digest values
+	 * one for each PCR Bank. This is called Crypto Agile Log Entry
+	 * Format. Current support implementation is for SHA1 and SHA256.
+	 * Number of digest values are identified by parsing first
+	 * structure stored in event log also called event header.
+	 * Further, the eventlog is written in packed form so to calculate
+	 * offset it is important to know the type of algorithm used.
+	 * Eg. 1:
+	 * digest_values.count = 1;
+	 * digest_values.digest[0].algorithm_id = sha1;
+	 * digest_values.digest[0].digest.sha1 = {20 bytes raw data};
+	 * Offset of eventsize is sizeof(count) + sizeof(algorithm_id) + 20
+	 *
+	 * Eg. 2:
+	 * digest_values.count = 1;
+	 * digest_values.digest[0].algorithm_id = sha256;
+	 * digest_values.digest[0].digest.sha1 = {32 bytes raw data};
+	 * Offset of eventsize is sizeof(count) + sizeof(algorithm_id) + 32
+
+	 * Eg. 3:
+	 * digest_values.count = 2;
+	 * digest_values.digest[0].algorithm_id = sha1;
+	 * digest_values.digest[0].digest.sha1 = {20 bytes raw data};
+	 * digest_values.digest[1].algorithm_id = sha256;
+	 * digest_values.digest[1].digest.sha256 = {32 bytes raw data};
+	 * Offset of eventsize is sizeof(count) + sizeof(algorithm_id) + 20
+	 *			+ sizeof(algorithm_id) + 32;
+	 *
+	 * So, it implies that offset of event_size can vary based on digest
+	 * values as defined by vendor. And so we have to calculate the
+	 * offset by parsing through number and type of digests being used.
+	 * And this is the purpose of using *marker to traverse the structure
+	 * and calculate the offset of event_size. This function uses *marker
+	 * to parse and calculate the dynamic size of the whole event structure.
+	 */
+
+	marker = event;
+	marker_start = marker;
+	marker = marker + sizeof(event->pcr_index) + sizeof(event->event_type)
+		+ sizeof(event->digests.count);
+
+	efispecid = (struct tcg_efispecideventstruct *) event_header->event;
+
+	for (j = 0; (j < efispecid->num_algs) && (j < HASH_COUNT); j++) {
+		marker = marker
+			+ sizeof(efispecid->digest_sizes[j].algorithm_id);
+		marker = marker + efispecid->digest_sizes[j].digest_size;
+	}
+
+	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_bios_log *log = m->private;
+	void *addr = log->bios_event_log;
+	void *limit = log->bios_event_log_end;
+	struct tcg_pcr_event *event_header;
+	struct tcg_pcr_event2 *event;
+	int i;
+	size_t size = 0;
+
+	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;
+	}
+
+	/* read over *pos measurements */
+	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_bios_log *log = m->private;
+	void *limit = log->bios_event_log_end;
+	void *marker;
+	size_t event_size = 0;
+
+	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_bios_log *log = m->private;
+	struct tcg_pcr_event *event_header = log->bios_event_log;
+	struct tcg_pcr_event2 *event = v;
+	void *temp_ptr;
+	size_t size = 0;
+
+	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_measurments_seqops = {
+	.start = tpm2_bios_measurements_start,
+	.next = tpm2_bios_measurements_next,
+	.stop = tpm2_bios_measurements_stop,
+	.show = tpm2_binary_bios_measurements_show,
+};
diff --git a/drivers/char/tpm/tpm2_of.c b/drivers/char/tpm/tpm2_of.c
new file mode 100644
index 0000000..b6403b9
--- /dev/null
+++ b/drivers/char/tpm/tpm2_of.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2016 IBM Corporation
+ *
+ * Authors:
+ *      Nayna Jain <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
+ *
+ * Defined read_log for PowerPC to identify event log location
+ * using device tree entries.
+ *
+ * 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 "tpm.h"
+#include "tpm_eventlog.h"
+
+int read_log(struct tpm_bios_log *log)
+{
+	struct device_node *np;
+	u32 logSize;
+	const u32 *sizep;
+	const u64 *basep;
+
+	if (log->bios_event_log != NULL) {
+		pr_err("%s: ERROR - Eventlog already initialized\n", __func__);
+		return -EFAULT;
+	}
+
+	np = of_find_node_by_name(NULL, "tpm");
+	if (!np) {
+		pr_err("%s: ERROR - tpm entry not supported\n", __func__);
+		return -ENODEV;
+	}
+
+	sizep = of_get_property(np, "linux,sml-size", NULL);
+	if (sizep == NULL) {
+		pr_err("%s: ERROR - sml-get-allocated-size not found\n",
+				__func__);
+		goto cleanup_eio;
+	}
+	logSize = be32_to_cpup(sizep);
+
+	if (logSize == 0) {
+		pr_err("%s: ERROR - event log area empty\n", __func__);
+		goto cleanup_eio;
+	}
+
+	basep = of_get_property(np, "linux,sml-base", NULL);
+	if (basep == NULL) {
+		pr_err("%s: ERROR - sml-handover not found\n", __func__);
+		goto cleanup_eio;
+	}
+
+	log->bios_event_log = kmalloc(logSize, GFP_KERNEL);
+	if (!log->bios_event_log) {
+		pr_err("%s: ERROR - Not enough memory for firmware measurements\n",
+				__func__);
+		of_node_put(np);
+		return -ENOMEM;
+	}
+
+	log->bios_event_log_end = log->bios_event_log + logSize;
+
+	memcpy(log->bios_event_log, __va(be64_to_cpup(basep)), logSize);
+
+	of_node_put(np);
+	return 0;
+
+cleanup_eio:
+	of_node_put(np);
+	return -EIO;
+}
diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 37efac3..d4e884b 100644
--- a/drivers/char/tpm/tpm_eventlog.h
+++ b/drivers/char/tpm/tpm_eventlog.h
@@ -79,15 +79,15 @@ enum tcpa_pc_event_ids {
 int read_log(struct tpm_bios_log *log);
 
 #if defined(CONFIG_TCG_IBMVTPM) || defined(CONFIG_TCG_IBMVTPM_MODULE) || \
-	defined(CONFIG_ACPI)
-extern struct dentry **tpm_bios_log_setup(const char *);
-extern void tpm_bios_log_teardown(struct dentry **);
+	defined(CONFIG_ACPI) || defined(CONFIG_PPC64)
+extern struct dentry **tpm_bios_log_setup(struct tpm_chip *chip);
+extern void tpm_bios_log_teardown(struct tpm_chip *chip);
 #else
-static inline struct dentry **tpm_bios_log_setup(const char *name)
+static inline struct dentry **tpm_bios_log_setup(struct tpm_chip *chip)
 {
 	return NULL;
 }
-static inline void tpm_bios_log_teardown(struct dentry **dir)
+static inline void tpm_bios_log_teardown(struct tpm_chip *chip)
 {
 }
 #endif
diff --git a/drivers/char/tpm/tpm_eventlog_init.c b/drivers/char/tpm/tpm_eventlog_init.c
index 8153509..504aa9b 100644
--- a/drivers/char/tpm/tpm_eventlog_init.c
+++ b/drivers/char/tpm/tpm_eventlog_init.c
@@ -28,6 +28,7 @@
 #include <linux/slab.h>
 
 #include "tpm.h"
+#include "tpm2.h"
 #include "tpm_eventlog.h"
 
 
@@ -89,6 +90,7 @@ static int tpm_binary_bios_measurements_open(struct inode *inode,
 {
 	int err;
 	struct tpm_bios_log *log;
+	struct tpm_chip *chip;
 	struct seq_file *seq;
 
 	log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
@@ -99,8 +101,14 @@ static int tpm_binary_bios_measurements_open(struct inode *inode,
 	if (err)
 		goto out_free;
 
+	chip = tpm_chip_find_get(TPM_ANY_NUM);
+
 	/* now register seq file */
-	err = seq_open(file, &tpm_binary_b_measurments_seqops);
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		err = seq_open(file, &tpm2_binary_b_measurments_seqops);
+	else
+		err = seq_open(file, &tpm_binary_b_measurments_seqops);
+
 	if (!err) {
 		seq = file->private_data;
 		seq->private = log;
@@ -109,6 +117,7 @@ static int tpm_binary_bios_measurements_open(struct inode *inode,
 	}
 
 out:
+	tpm_put_ops(chip);
 	return err;
 out_free:
 	kfree(log->bios_event_log);
@@ -132,9 +141,23 @@ static int is_bad(void *p)
 	return 0;
 }
 
-struct dentry **tpm_bios_log_setup(const char *name)
+struct dentry **tpm_bios_log_setup(struct tpm_chip *chip)
 {
+	int num_files = 0;
 	struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
+	const char *name = dev_name(&chip->dev);
+
+	/*
+	 * NOTE: Currently, support is added only for binary_bios_measurements
+	 * for TPM2.0. And so it is required to check that if device is TPM2,
+	 * only 2 entries are allocated i.e. tpm0 dir and
+	 * binary_bios_measurements file.
+	 */
+
+	num_files = chip->flags & TPM_CHIP_FLAG_TPM2 ? 2 : 3;
+	ret = kmalloc_array(num_files, sizeof(struct dentry *), GFP_KERNEL);
+	if (!ret)
+		goto out;
 
 	tpm_dir = securityfs_create_dir(name, NULL);
 	if (is_bad(tpm_dir))
@@ -147,25 +170,22 @@ struct dentry **tpm_bios_log_setup(const char *name)
 	if (is_bad(bin_file))
 		goto out_tpm;
 
-	ascii_file =
-	    securityfs_create_file("ascii_bios_measurements",
-				   S_IRUSR | S_IRGRP, tpm_dir, NULL,
-				   &tpm_ascii_bios_measurements_ops);
-	if (is_bad(ascii_file))
-		goto out_bin;
 
-	ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
-	if (!ret)
-		goto out_ascii;
+	ret[num_files-1] = tpm_dir;
+	ret[num_files-2] = bin_file;
+	if (num_files == 3) {
+		ascii_file =
+			securityfs_create_file("ascii_bios_measurements",
+					S_IRUSR | S_IRGRP, tpm_dir, NULL,
+					&tpm_ascii_bios_measurements_ops);
+		if (is_bad(ascii_file))
+			goto out_bin;
 
-	ret[0] = ascii_file;
-	ret[1] = bin_file;
-	ret[2] = tpm_dir;
+		ret[num_files - 3] = ascii_file;
+	}
 
 	return ret;
 
-out_ascii:
-	securityfs_remove(ascii_file);
 out_bin:
 	securityfs_remove(bin_file);
 out_tpm:
@@ -174,10 +194,23 @@ out:
 	return NULL;
 }
 
-void tpm_bios_log_teardown(struct dentry **lst)
+void tpm_bios_log_teardown(struct tpm_chip *chip)
 {
-	int i;
+	int i, n_entries;
+	struct dentry **lst;
+
+	lst = chip->bios_dir;
+
+	/*
+	 * NOTE: For same reason as in tpm_bios_log_setup()
+	 * number of entries for TPM2.0 are only 2 i.e. tpm0 dir
+	 * and binary_bios_measurements file. and for TPM1.2, there
+	 * are three i.e. tpm0 dir, binary_bios_measurements and
+	 * ascii_bios_measurements.
+	 */
+
+	n_entries = (chip->flags & TPM_CHIP_FLAG_TPM2) ? 2 : 3;
 
-	for (i = 0; i < 3; i++)
+	for (i = 0; i < n_entries; i++)
 		securityfs_remove(lst[i]);
 }
-- 
2.5.0


------------------------------------------------------------------------------

Re: [PATCH 1/2] TPM2.0: Refactor eventlog init functions for TPM1.2 and

[Jason Gunthorpe]

On Fri, Jul 29, 2016 at 02:44:38AM -0400, Nayna Jain wrote:
> Refactored eventlog.c file into tpm_eventlog.c and tpm_eventlog_init.c

If you are going to work on this stuff (and have the ability to test
it) can you fix some of the generic pre-existing problems too?

> +static int tpm_ascii_bios_measurements_open(struct inode *inode,
> +					    struct file *file)

> +static int tpm_binary_bios_measurements_open(struct inode *inode,
> +					     struct file *file)

We don't need two (or more!) identical versions of this function, and it
is easy to fix:

> +	bin_file =
> +	    securityfs_create_file("binary_bios_measurements",
> +				   S_IRUSR | S_IRGRP, tpm_dir, NULL,
> +				   &tpm_binary_bios_measurements_ops);

Replace NULL with &tpm_binary_b_measurments_seqops and recover it  in
the generic open using the inode->i_private pointer.

> +	ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
> +	if (!ret)
> +		goto out_ascii;

I can't find a kfree for this memory, looks like it is leaking, please
fix it.

Do not allocate memory for this, just include the dentry array
directly in the tpm_chip as the sysfs does today.

You can change the signatures to accept tpm_chip in a cleanup patch as
well, moving from the tpm2 patch.

Jason

------------------------------------------------------------------------------

Re: [PATCH 2/2] TPM2.0:Adds securityfs support for TPM2.0 eventlog

[Jason Gunthorpe]

On Fri, Jul 29, 2016 at 02:44:39AM -0400, Nayna Jain wrote:
  
> +	chip->bios_dir = tpm_bios_log_setup(chip);
> +

And the next somewhat pre-existing issue is that we call
tpm_bios_log_setup even if we don't have access to a bios log.

Does the bios log ever change or is it static at boot? Can we move
read_log into the chip and do it once so we can tell if it worked
before creating security fs stuff??

> +++ b/drivers/char/tpm/tpm2.h

You should probably pick a different name if this is only bios log
stuff.

> +struct tcg_efispecideventalgorithmsize {
> +	u16	algorithm_id;
> +	u16	digest_size;
> +} __packed;

The bios log is defined to be host endian?

Please refernce the standard in a comment that these structs are
coming from.

> +int read_log(struct tpm_bios_log *log)
> +{
> +	struct device_node *np;
> +	u32 logSize;
> +	const u32 *sizep;
> +	const u64 *basep;
> +
> +	if (log->bios_event_log != NULL) {
> +		pr_err("%s: ERROR - Eventlog already initialized\n",
> __func__);

No to all this logging.

If you really need some of it then use dev_dbg(&chip->dev) pr_err is
not acceptable.

Yes, this means you need to safely get tpm_chip into read_log. Please
make that a singular patch because the lifetime model will be quite
complex.

> +	np = of_find_node_by_name(NULL, "tpm");
> +	if (!np) {
> +		pr_err("%s: ERROR - tpm entry not supported\n", __func__);
> +		return -ENODEV;
> +	}

If you are doing of stuff then you need to document it in
Documentation/device-tree, so NAK on this without a proper
documentation patch. (make sure you follow the special rules for these
patches)

What is 'tpm' ? Is that the DT node that the TPM driver is binding
too? If so then you need to use chip->pdev->of_node instead of
'of_find_node_by_name'.

Same comments applies to the pre-existing tpm_of.c, please fix that as
well.

Why have you substantially copied tpm_of and called it tpm2_of? Don't
do that.

> +
> +	sizep = of_get_property(np, "linux,sml-size", NULL);
> +	if (sizep == NULL) {
> +		pr_err("%s: ERROR - sml-get-allocated-size not found\n",
> +				__func__);
> +		goto cleanup_eio;
> +	}
> +	logSize = be32_to_cpup(sizep);

If you call endianness converters then make sure to tag
properly. eg sizep should be a be32, etc. Audit everything in
eventlog, I saw other cases..

> +	log->bios_event_log = kmalloc(logSize, GFP_KERNEL);
> +	if (!log->bios_event_log) {
> +		pr_err("%s: ERROR - Not enough memory for firmware measurements\n",
> +				__func__);

Never log for ENOMEM, the kernel logs extensively already.

>  #if defined(CONFIG_TCG_IBMVTPM) || defined(CONFIG_TCG_IBMVTPM_MODULE) || \
> -	defined(CONFIG_ACPI)
> -extern struct dentry **tpm_bios_log_setup(const char *);
> -extern void tpm_bios_log_teardown(struct dentry **);
> +	defined(CONFIG_ACPI) || defined(CONFIG_PPC64)
> +extern struct dentry **tpm_bios_log_setup(struct tpm_chip *chip);
> +extern void tpm_bios_log_teardown(struct tpm_chip *chip);

I'm really deeply unhappy about these ifdefs and the general scheme
that was used to force this special difference into the tpm core.

Please find another way to do it.

IMHO, 'read_log' should simply try ACPI and OF in sequence to find the
log.

> +	num_files = chip->flags & TPM_CHIP_FLAG_TPM2 ? 2 : 3;
> +	ret = kmalloc_array(num_files, sizeof(struct dentry *), GFP_KERNEL);
> +	if (!ret)
> +		goto out;

Follow the sysfs pattern please.

Jason

------------------------------------------------------------------------------

Re: [PATCH 1/2] TPM2.0: Refactor eventlog init functions for TPM1.2 and

[Nayna]

Hi Jason,

Thanks for the review.

On 07/29/2016 10:27 PM, Jason Gunthorpe wrote:
> On Fri, Jul 29, 2016 at 02:44:38AM -0400, Nayna Jain wrote:
>> Refactored eventlog.c file into tpm_eventlog.c and tpm_eventlog_init.c
>
> If you are going to work on this stuff (and have the ability to test
> it) can you fix some of the generic pre-existing problems too?

Can you please help me to understand what in particular are you 
referring to by "some of the generic pre-existing problems" ?
>
>> +static int tpm_ascii_bios_measurements_open(struct inode *inode,
>> +					    struct file *file)
>
>> +static int tpm_binary_bios_measurements_open(struct inode *inode,
>> +					     struct file *file)
>
> We don't need two (or more!) identical versions of this function, and it
> is easy to fix:

Sure, will fix it.
>
>> +	bin_file =
>> +	    securityfs_create_file("binary_bios_measurements",
>> +				   S_IRUSR | S_IRGRP, tpm_dir, NULL,
>> +				   &tpm_binary_bios_measurements_ops);
>
> Replace NULL with &tpm_binary_b_measurments_seqops and recover it  in
> the generic open using the inode->i_private pointer.

Sure, will fix it.

>
>> +	ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
>> +	if (!ret)
>> +		goto out_ascii;
>
> I can't find a kfree for this memory, looks like it is leaking, please
> fix it.
>
> Do not allocate memory for this, just include the dentry array
> directly in the tpm_chip as the sysfs does today.

Do you mean here to define it as struct dentry *bios_dir[3] as member of 
struct tpm_chip ?

>
> You can change the signatures to accept tpm_chip in a cleanup patch as
> well, moving from the tpm2 patch.
>

Ok. Will address these comments in the next version of the patch I will 
be posting.

Thanks & Regards,
    - Nayna

> Jason
>


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Re: [PATCH 2/2] TPM2.0:Adds securityfs support for TPM2.0 eventlog

[Ken Goldman]

On 7/29/2016 1:14 PM, Jason Gunthorpe wrote:
>
> The bios log is defined to be host endian?
>
> Please reference the standard in a comment that these structs are
> coming from.

The BIOS log is little endian.  That is, all multi-byte values are 
little endian.  Examples are the pcrIndex, eventType, and eventSize,
as well as the digest count and hashAlg.

 From the "TCG PC Client Platform Firmware Profile Specification"

1.7	Specification Conventions

1.	All constants and data SHALL be represented as Little Endian format 
unless otherwise explicitly stated.




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Re: [PATCH 2/2] TPM2.0:Adds securityfs support for TPM2.0 eventlog

[Jason Gunthorpe]

On Mon, Aug 29, 2016 at 08:52:59AM -0400, Ken Goldman wrote:
> On 7/29/2016 1:14 PM, Jason Gunthorpe wrote:
> >
> > The bios log is defined to be host endian?
> >
> > Please reference the standard in a comment that these structs are
> > coming from.
> 
> The BIOS log is little endian.  That is, all multi-byte values are 
> little endian.  Examples are the pcrIndex, eventType, and eventSize,
> as well as the digest count and hashAlg.
> 
>  From the "TCG PC Client Platform Firmware Profile Specification"
> 
> 1.7	Specification Conventions
> 
> 1.	All constants and data SHALL be represented as Little Endian format 
> unless otherwise explicitly stated.

Surely all those structs need to be tagged le32/etc then?

Jason

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