drivers/char/tpm/tpm-sysfs.c - kernel/msm-5.4 - Gitiles

 /*
  * Copyright (C) 2004 IBM Corporation
  * Authors:
  * Leendert van Doorn <leendert@watson.ibm.com>
  * Dave Safford <safford@watson.ibm.com>
  * Reiner Sailer <sailer@watson.ibm.com>
  * Kylene Hall <kjhall@us.ibm.com>
  *
  * Copyright (C) 2013 Obsidian Research Corp
  * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
  *
  * sysfs filesystem inspection interface to the TPM
  *
  * 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, version 2 of the
  * License.
  *
  */
 #include <linux/device.h>
 #include "tpm.h"

 struct tpm_readpubek_out {
 	u8 algorithm[4];
 	u8 encscheme[2];
 	u8 sigscheme[2];
 	__be32 paramsize;
 	u8 parameters[12];
 	__be32 keysize;
 	u8 modulus[256];
 	u8 checksum[20];
 } __packed;

 #define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
 #define TPM_ORD_READPUBEK 124

 static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
 	struct tpm_buf tpm_buf;
 	struct tpm_readpubek_out *out;
 	ssize_t rc;
 	int i;
 	char *str = buf;
 	struct tpm_chip *chip = to_tpm_chip(dev);
 	char anti_replay[20];

 	memset(&anti_replay, 0, sizeof(anti_replay));

 	rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);
 	if (rc)
 		return rc;

 	tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));

 	rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE,
 			      READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
 			      "attempting to read the PUBEK");
 	if (rc) {
 		tpm_buf_destroy(&tpm_buf);
 		return 0;
 	}

 	out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
 	str +=
 	    sprintf(str,
 		    "Algorithm: %02X %02X %02X %02X\n"
 		    "Encscheme: %02X %02X\n"
 		    "Sigscheme: %02X %02X\n"
 		    "Parameters: %02X %02X %02X %02X "
 		    "%02X %02X %02X %02X "
 		    "%02X %02X %02X %02X\n"
 		    "Modulus length: %d\n"
 		    "Modulus:\n",
 		    out->algorithm[0], out->algorithm[1], out->algorithm[2],
 		    out->algorithm[3],
 		    out->encscheme[0], out->encscheme[1],
 		    out->sigscheme[0], out->sigscheme[1],
 		    out->parameters[0], out->parameters[1],
 		    out->parameters[2], out->parameters[3],
 		    out->parameters[4], out->parameters[5],
 		    out->parameters[6], out->parameters[7],
 		    out->parameters[8], out->parameters[9],
 		    out->parameters[10], out->parameters[11],
 		    be32_to_cpu(out->keysize));

 	for (i = 0; i < 256; i++) {
 		str += sprintf(str, "%02X ", out->modulus[i]);
 		if ((i + 1) % 16 == 0)
 			str += sprintf(str, "\n");
 	}

 	rc = str - buf;
 	tpm_buf_destroy(&tpm_buf);
 	return rc;
 }
 static DEVICE_ATTR_RO(pubek);

 static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	cap_t cap;
 	u8 digest[TPM_DIGEST_SIZE];
 	ssize_t rc;
 	int i, j, num_pcrs;
 	char *str = buf;
 	struct tpm_chip *chip = to_tpm_chip(dev);

 	rc = tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
 			 "attempting to determine the number of PCRS",
 			 sizeof(cap.num_pcrs));
 	if (rc)
 		return 0;

 	num_pcrs = be32_to_cpu(cap.num_pcrs);
 	for (i = 0; i < num_pcrs; i++) {
 		rc = tpm1_pcr_read(chip, i, digest);
 		if (rc)
 			break;
 		str += sprintf(str, "PCR-%02d: ", i);
 		for (j = 0; j < TPM_DIGEST_SIZE; j++)
 			str += sprintf(str, "%02X ", digest[j]);
 		str += sprintf(str, "\n");
 	}
 	return str - buf;
 }
 static DEVICE_ATTR_RO(pcrs);

 static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
 		     char *buf)
 {
 	cap_t cap;
 	ssize_t rc;

 	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
 			 "attempting to determine the permanent enabled state",
 			 sizeof(cap.perm_flags));
 	if (rc)
 		return 0;

 	rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
 	return rc;
 }
 static DEVICE_ATTR_RO(enabled);

 static ssize_t active_show(struct device *dev, struct device_attribute *attr,
 		    char *buf)
 {
 	cap_t cap;
 	ssize_t rc;

 	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
 			 "attempting to determine the permanent active state",
 			 sizeof(cap.perm_flags));
 	if (rc)
 		return 0;

 	rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
 	return rc;
 }
 static DEVICE_ATTR_RO(active);

 static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
 	cap_t cap;
 	ssize_t rc;

 	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
 			 "attempting to determine the owner state",
 			 sizeof(cap.owned));
 	if (rc)
 		return 0;

 	rc = sprintf(buf, "%d\n", cap.owned);
 	return rc;
 }
 static DEVICE_ATTR_RO(owned);

 static ssize_t temp_deactivated_show(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
 	cap_t cap;
 	ssize_t rc;

 	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
 			 "attempting to determine the temporary state",
 			 sizeof(cap.stclear_flags));
 	if (rc)
 		return 0;

 	rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
 	return rc;
 }
 static DEVICE_ATTR_RO(temp_deactivated);

 static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	struct tpm_chip *chip = to_tpm_chip(dev);
 	cap_t cap;
 	ssize_t rc;
 	char *str = buf;

 	rc = tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
 			 "attempting to determine the manufacturer",
 			 sizeof(cap.manufacturer_id));
 	if (rc)
 		return 0;
 	str += sprintf(str, "Manufacturer: 0x%x\n",
 		       be32_to_cpu(cap.manufacturer_id));

 	/* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
 	rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
 			 "attempting to determine the 1.2 version",
 			 sizeof(cap.tpm_version_1_2));
 	if (!rc) {
 		str += sprintf(str,
 			       "TCG version: %d.%d\nFirmware version: %d.%d\n",
 			       cap.tpm_version_1_2.Major,
 			       cap.tpm_version_1_2.Minor,
 			       cap.tpm_version_1_2.revMajor,
 			       cap.tpm_version_1_2.revMinor);
 	} else {
 		/* Otherwise just use TPM_STRUCT_VER */
 		rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
 				 "attempting to determine the 1.1 version",
 				 sizeof(cap.tpm_version));
 		if (rc)
 			return 0;
 		str += sprintf(str,
 			       "TCG version: %d.%d\nFirmware version: %d.%d\n",
 			       cap.tpm_version.Major,
 			       cap.tpm_version.Minor,
 			       cap.tpm_version.revMajor,
 			       cap.tpm_version.revMinor);
 	}

 	return str - buf;
 }
 static DEVICE_ATTR_RO(caps);

 static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
 			    const char *buf, size_t count)
 {
 	struct tpm_chip *chip = to_tpm_chip(dev);
 	if (chip == NULL)
 		return 0;

 	chip->ops->cancel(chip);
 	return count;
 }
 static DEVICE_ATTR_WO(cancel);

 static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
 			      char *buf)
 {
 	struct tpm_chip *chip = to_tpm_chip(dev);

 	if (chip->duration[TPM_LONG] == 0)
 		return 0;

 	return sprintf(buf, "%d %d %d [%s]\n",
 		       jiffies_to_usecs(chip->duration[TPM_SHORT]),
 		       jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
 		       jiffies_to_usecs(chip->duration[TPM_LONG]),
 		       chip->duration_adjusted
 		       ? "adjusted" : "original");
 }
 static DEVICE_ATTR_RO(durations);

 static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
 			     char *buf)
 {
 	struct tpm_chip *chip = to_tpm_chip(dev);

 	return sprintf(buf, "%d %d %d %d [%s]\n",
 		       jiffies_to_usecs(chip->timeout_a),
 		       jiffies_to_usecs(chip->timeout_b),
 		       jiffies_to_usecs(chip->timeout_c),
 		       jiffies_to_usecs(chip->timeout_d),
 		       chip->timeout_adjusted
 		       ? "adjusted" : "original");
 }
 static DEVICE_ATTR_RO(timeouts);

 static struct attribute *tpm_dev_attrs[] = {
 	&dev_attr_pubek.attr,
 	&dev_attr_pcrs.attr,
 	&dev_attr_enabled.attr,
 	&dev_attr_active.attr,
 	&dev_attr_owned.attr,
 	&dev_attr_temp_deactivated.attr,
 	&dev_attr_caps.attr,
 	&dev_attr_cancel.attr,
 	&dev_attr_durations.attr,
 	&dev_attr_timeouts.attr,
 	NULL,
 };

 static const struct attribute_group tpm_dev_group = {
 	.attrs = tpm_dev_attrs,
 };

 void tpm_sysfs_add_device(struct tpm_chip *chip)
 {
 	/* XXX: If you wish to remove this restriction, you must first update
 	 * tpm_sysfs to explicitly lock chip->ops.
 	 */
 	if (chip->flags & TPM_CHIP_FLAG_TPM2)
 		return;

 	/* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
 	 * is called before ops is null'd and the sysfs core synchronizes this
 	 * removal so that no callbacks are running or can run again
 	 */
 	WARN_ON(chip->groups_cnt != 0);
 	chip->groups[chip->groups_cnt++] = &tpm_dev_group;
 }
	/*
	* Copyright (C) 2004 IBM Corporation
	* Authors:
	* Leendert van Doorn <leendert@watson.ibm.com>
	* Dave Safford <safford@watson.ibm.com>
	* Reiner Sailer <sailer@watson.ibm.com>
	* Kylene Hall <kjhall@us.ibm.com>
	*
	* Copyright (C) 2013 Obsidian Research Corp
	* Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
	*
	* sysfs filesystem inspection interface to the TPM
	*
	* 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, version 2 of the
	* License.
	*
	*/
	#include <linux/device.h>
	#include "tpm.h"

	struct tpm_readpubek_out {
	u8 algorithm[4];
	u8 encscheme[2];
	u8 sigscheme[2];
	__be32 paramsize;
	u8 parameters[12];
	__be32 keysize;
	u8 modulus[256];
	u8 checksum[20];
	} __packed;

	#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
	#define TPM_ORD_READPUBEK 124

	static ssize_t pubek_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct tpm_buf tpm_buf;
	struct tpm_readpubek_out *out;
	ssize_t rc;
	int i;
	char *str = buf;
	struct tpm_chip *chip = to_tpm_chip(dev);
	char anti_replay[20];

	memset(&anti_replay, 0, sizeof(anti_replay));

	rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);
	if (rc)
	return rc;

	tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));

	rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE,
	READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
	"attempting to read the PUBEK");
	if (rc) {
	tpm_buf_destroy(&tpm_buf);
	return 0;
	}

	out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
	str +=
	sprintf(str,
	"Algorithm: %02X %02X %02X %02X\n"
	"Encscheme: %02X %02X\n"
	"Sigscheme: %02X %02X\n"
	"Parameters: %02X %02X %02X %02X "
	"%02X %02X %02X %02X "
	"%02X %02X %02X %02X\n"
	"Modulus length: %d\n"
	"Modulus:\n",
	out->algorithm[0], out->algorithm[1], out->algorithm[2],
	out->algorithm[3],
	out->encscheme[0], out->encscheme[1],
	out->sigscheme[0], out->sigscheme[1],
	out->parameters[0], out->parameters[1],
	out->parameters[2], out->parameters[3],
	out->parameters[4], out->parameters[5],
	out->parameters[6], out->parameters[7],
	out->parameters[8], out->parameters[9],
	out->parameters[10], out->parameters[11],
	be32_to_cpu(out->keysize));

	for (i = 0; i < 256; i++) {
	str += sprintf(str, "%02X ", out->modulus[i]);
	if ((i + 1) % 16 == 0)
	str += sprintf(str, "\n");
	}

	rc = str - buf;
	tpm_buf_destroy(&tpm_buf);
	return rc;
	}
	static DEVICE_ATTR_RO(pubek);

	static ssize_t pcrs_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	cap_t cap;
	u8 digest[TPM_DIGEST_SIZE];
	ssize_t rc;
	int i, j, num_pcrs;
	char *str = buf;
	struct tpm_chip *chip = to_tpm_chip(dev);

	rc = tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
	"attempting to determine the number of PCRS",
	sizeof(cap.num_pcrs));
	if (rc)
	return 0;

	num_pcrs = be32_to_cpu(cap.num_pcrs);
	for (i = 0; i < num_pcrs; i++) {
	rc = tpm1_pcr_read(chip, i, digest);
	if (rc)
	break;
	str += sprintf(str, "PCR-%02d: ", i);
	for (j = 0; j < TPM_DIGEST_SIZE; j++)
	str += sprintf(str, "%02X ", digest[j]);
	str += sprintf(str, "\n");
	}
	return str - buf;
	}
	static DEVICE_ATTR_RO(pcrs);

	static ssize_t enabled_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	cap_t cap;
	ssize_t rc;

	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
	"attempting to determine the permanent enabled state",
	sizeof(cap.perm_flags));
	if (rc)
	return 0;

	rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
	return rc;
	}
	static DEVICE_ATTR_RO(enabled);

	static ssize_t active_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	cap_t cap;
	ssize_t rc;

	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
	"attempting to determine the permanent active state",
	sizeof(cap.perm_flags));
	if (rc)
	return 0;

	rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
	return rc;
	}
	static DEVICE_ATTR_RO(active);

	static ssize_t owned_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	cap_t cap;
	ssize_t rc;

	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
	"attempting to determine the owner state",
	sizeof(cap.owned));
	if (rc)
	return 0;

	rc = sprintf(buf, "%d\n", cap.owned);
	return rc;
	}
	static DEVICE_ATTR_RO(owned);

	static ssize_t temp_deactivated_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	cap_t cap;
	ssize_t rc;

	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
	"attempting to determine the temporary state",
	sizeof(cap.stclear_flags));
	if (rc)
	return 0;

	rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
	return rc;
	}
	static DEVICE_ATTR_RO(temp_deactivated);

	static ssize_t caps_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct tpm_chip *chip = to_tpm_chip(dev);
	cap_t cap;
	ssize_t rc;
	char *str = buf;

	rc = tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
	"attempting to determine the manufacturer",
	sizeof(cap.manufacturer_id));
	if (rc)
	return 0;
	str += sprintf(str, "Manufacturer: 0x%x\n",
	be32_to_cpu(cap.manufacturer_id));

	/* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
	rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
	"attempting to determine the 1.2 version",
	sizeof(cap.tpm_version_1_2));
	if (!rc) {
	str += sprintf(str,
	"TCG version: %d.%d\nFirmware version: %d.%d\n",
	cap.tpm_version_1_2.Major,
	cap.tpm_version_1_2.Minor,
	cap.tpm_version_1_2.revMajor,
	cap.tpm_version_1_2.revMinor);
	} else {
	/* Otherwise just use TPM_STRUCT_VER */
	rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
	"attempting to determine the 1.1 version",
	sizeof(cap.tpm_version));
	if (rc)
	return 0;
	str += sprintf(str,
	"TCG version: %d.%d\nFirmware version: %d.%d\n",
	cap.tpm_version.Major,
	cap.tpm_version.Minor,
	cap.tpm_version.revMajor,
	cap.tpm_version.revMinor);
	}

	return str - buf;
	}
	static DEVICE_ATTR_RO(caps);

	static ssize_t cancel_store(struct device dev, struct device_attribute attr,
	const char *buf, size_t count)
	{
	struct tpm_chip *chip = to_tpm_chip(dev);
	if (chip == NULL)
	return 0;

	chip->ops->cancel(chip);
	return count;
	}
	static DEVICE_ATTR_WO(cancel);

	static ssize_t durations_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct tpm_chip *chip = to_tpm_chip(dev);

	if (chip->duration[TPM_LONG] == 0)
	return 0;

	return sprintf(buf, "%d %d %d [%s]\n",
	jiffies_to_usecs(chip->duration[TPM_SHORT]),
	jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
	jiffies_to_usecs(chip->duration[TPM_LONG]),
	chip->duration_adjusted
	? "adjusted" : "original");
	}
	static DEVICE_ATTR_RO(durations);

	static ssize_t timeouts_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct tpm_chip *chip = to_tpm_chip(dev);

	return sprintf(buf, "%d %d %d %d [%s]\n",
	jiffies_to_usecs(chip->timeout_a),
	jiffies_to_usecs(chip->timeout_b),
	jiffies_to_usecs(chip->timeout_c),
	jiffies_to_usecs(chip->timeout_d),
	chip->timeout_adjusted
	? "adjusted" : "original");
	}
	static DEVICE_ATTR_RO(timeouts);

	static struct attribute *tpm_dev_attrs[] = {
	&dev_attr_pubek.attr,
	&dev_attr_pcrs.attr,
	&dev_attr_enabled.attr,
	&dev_attr_active.attr,
	&dev_attr_owned.attr,
	&dev_attr_temp_deactivated.attr,
	&dev_attr_caps.attr,
	&dev_attr_cancel.attr,
	&dev_attr_durations.attr,
	&dev_attr_timeouts.attr,
	NULL,
	};

	static const struct attribute_group tpm_dev_group = {
	.attrs = tpm_dev_attrs,
	};

	void tpm_sysfs_add_device(struct tpm_chip *chip)
	{
	/* XXX: If you wish to remove this restriction, you must first update
	* tpm_sysfs to explicitly lock chip->ops.
	*/
	if (chip->flags & TPM_CHIP_FLAG_TPM2)
	return;

	/* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
	* is called before ops is null'd and the sysfs core synchronizes this
	* removal so that no callbacks are running or can run again
	*/
	WARN_ON(chip->groups_cnt != 0);
	chip->groups[chip->groups_cnt++] = &tpm_dev_group;
	}