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linux-sg2042/drivers/char/tpm/tpm-sysfs.c

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/*
* 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"
#define READ_PUBEK_RESULT_SIZE 314
#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
#define TPM_ORD_READPUBEK 124
static const struct tpm_input_header tpm_readpubek_header = {
.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
.length = cpu_to_be32(30),
.ordinal = cpu_to_be32(TPM_ORD_READPUBEK)
};
static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
u8 *data;
struct tpm_cmd_t tpm_cmd;
ssize_t err;
int i, rc;
char *str = buf;
struct tpm_chip *chip = to_tpm_chip(dev);
memset(&tpm_cmd, 0, sizeof(tpm_cmd));
tpm_cmd.header.in = tpm_readpubek_header;
err = tpm_transmit_cmd(chip, NULL, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
"attempting to read the PUBEK");
if (err)
goto out;
/*
ignore header 10 bytes
algorithm 32 bits (1 == RSA )
encscheme 16 bits
sigscheme 16 bits
parameters (RSA 12->bytes: keybit, #primes, expbit)
keylenbytes 32 bits
256 byte modulus
ignore checksum 20 bytes
*/
data = tpm_cmd.params.readpubek_out_buffer;
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",
data[0], data[1], data[2], data[3],
data[4], data[5],
data[6], data[7],
data[12], data[13], data[14], data[15],
data[16], data[17], data[18], data[19],
data[20], data[21], data[22], data[23],
be32_to_cpu(*((__be32 *) (data + 24))));
for (i = 0; i < 256; i++) {
str += sprintf(str, "%02X ", data[i + 28]);
if ((i + 1) % 16 == 0)
str += sprintf(str, "\n");
}
out:
rc = str - 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 = tpm_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 = tpm_pcr_read_dev(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 = tpm_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 = tpm_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 = tpm_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 = tpm_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 = tpm_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 = tpm_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 = tpm_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;
}
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