1 files changed, 347 insertions, 0 deletions

diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
new file mode 100644
index 000000000..e2ff0b273
--- /dev/null
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -0,0 +1,347 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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
+ */
+#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;
+	int i;
+	char *str = buf;
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	char anti_replay[20];
+
+	memset(&anti_replay, 0, sizeof(anti_replay));
+
+	if (tpm_try_get_ops(chip))
+		return 0;
+
+	if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
+		goto out_ops;
+
+	tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
+
+	if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
+			     "attempting to read the PUBEK"))
+		goto out_buf;
+
+	out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
+	str +=
+	    sprintf(str,
+		    "Algorithm: %4ph\n"
+		    "Encscheme: %2ph\n"
+		    "Sigscheme: %2ph\n"
+		    "Parameters: %12ph\n"
+		    "Modulus length: %d\n"
+		    "Modulus:\n",
+		    out->algorithm,
+		    out->encscheme,
+		    out->sigscheme,
+		    out->parameters,
+		    be32_to_cpu(out->keysize));
+
+	for (i = 0; i < 256; i += 16)
+		str += sprintf(str, "%16ph\n", &out->modulus[i]);
+
+out_buf:
+	tpm_buf_destroy(&tpm_buf);
+out_ops:
+	tpm_put_ops(chip);
+	return str - buf;
+}
+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];
+	u32 i, j, num_pcrs;
+	char *str = buf;
+	struct tpm_chip *chip = to_tpm_chip(dev);
+
+	if (tpm_try_get_ops(chip))
+		return 0;
+
+	if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
+			"attempting to determine the number of PCRS",
+			sizeof(cap.num_pcrs))) {
+		tpm_put_ops(chip);
+		return 0;
+	}
+
+	num_pcrs = be32_to_cpu(cap.num_pcrs);
+	for (i = 0; i < num_pcrs; i++) {
+		if (tpm1_pcr_read(chip, i, digest)) {
+			str = buf;
+			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");
+	}
+	tpm_put_ops(chip);
+	return str - buf;
+}
+static DEVICE_ATTR_RO(pcrs);
+
+static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
+		     char *buf)
+{
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	ssize_t rc = 0;
+	cap_t cap;
+
+	if (tpm_try_get_ops(chip))
+		return 0;
+
+	if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
+			"attempting to determine the permanent enabled state",
+			sizeof(cap.perm_flags)))
+		goto out_ops;
+
+	rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
+out_ops:
+	tpm_put_ops(chip);
+	return rc;
+}
+static DEVICE_ATTR_RO(enabled);
+
+static ssize_t active_show(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	ssize_t rc = 0;
+	cap_t cap;
+
+	if (tpm_try_get_ops(chip))
+		return 0;
+
+	if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
+			"attempting to determine the permanent active state",
+			sizeof(cap.perm_flags)))
+		goto out_ops;
+
+	rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
+out_ops:
+	tpm_put_ops(chip);
+	return rc;
+}
+static DEVICE_ATTR_RO(active);
+
+static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	ssize_t rc = 0;
+	cap_t cap;
+
+	if (tpm_try_get_ops(chip))
+		return 0;
+
+	if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
+			"attempting to determine the owner state",
+			sizeof(cap.owned)))
+		goto out_ops;
+
+	rc = sprintf(buf, "%d\n", cap.owned);
+out_ops:
+	tpm_put_ops(chip);
+	return rc;
+}
+static DEVICE_ATTR_RO(owned);
+
+static ssize_t temp_deactivated_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	ssize_t rc = 0;
+	cap_t cap;
+
+	if (tpm_try_get_ops(chip))
+		return 0;
+
+	if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
+			"attempting to determine the temporary state",
+			sizeof(cap.stclear_flags)))
+		goto out_ops;
+
+	rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
+out_ops:
+	tpm_put_ops(chip);
+	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);
+	struct tpm1_version *version;
+	ssize_t rc = 0;
+	char *str = buf;
+	cap_t cap;
+
+	if (tpm_try_get_ops(chip))
+		return 0;
+
+	if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
+			"attempting to determine the manufacturer",
+			sizeof(cap.manufacturer_id)))
+		goto out_ops;
+
+	str += sprintf(str, "Manufacturer: 0x%x\n",
+		       be32_to_cpu(cap.manufacturer_id));
+
+	/* TPM 1.2 */
+	if (!tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
+			 "attempting to determine the 1.2 version",
+			 sizeof(cap.version2))) {
+		version = &cap.version2.version;
+		goto out_print;
+	}
+
+	/* TPM 1.1 */
+	if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
+			"attempting to determine the 1.1 version",
+			sizeof(cap.version1))) {
+		goto out_ops;
+	}
+
+	version = &cap.version1;
+
+out_print:
+	str += sprintf(str,
+		       "TCG version: %d.%d\nFirmware version: %d.%d\n",
+		       version->major, version->minor,
+		       version->rev_major, version->rev_minor);
+
+	rc = str - buf;
+
+out_ops:
+	tpm_put_ops(chip);
+	return rc;
+}
+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 (tpm_try_get_ops(chip))
+		return 0;
+
+	chip->ops->cancel(chip);
+	tpm_put_ops(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 ssize_t tpm_version_major_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct tpm_chip *chip = to_tpm_chip(dev);
+
+	return sprintf(buf, "%s\n", chip->flags & TPM_CHIP_FLAG_TPM2
+		       ? "2" : "1");
+}
+static DEVICE_ATTR_RO(tpm_version_major);
+
+static struct attribute *tpm1_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,
+	&dev_attr_tpm_version_major.attr,
+	NULL,
+};
+
+static struct attribute *tpm2_dev_attrs[] = {
+	&dev_attr_tpm_version_major.attr,
+	NULL
+};
+
+static const struct attribute_group tpm1_dev_group = {
+	.attrs = tpm1_dev_attrs,
+};
+
+static const struct attribute_group tpm2_dev_group = {
+	.attrs = tpm2_dev_attrs,
+};
+
+void tpm_sysfs_add_device(struct tpm_chip *chip)
+{
+	WARN_ON(chip->groups_cnt != 0);
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		chip->groups[chip->groups_cnt++] = &tpm2_dev_group;
+	else
+		chip->groups[chip->groups_cnt++] = &tpm1_dev_group;
+}