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Diffstat (limited to 'drivers/char/tpm/tpm-sysfs.c')
-rw-r--r--drivers/char/tpm/tpm-sysfs.c351
1 files changed, 351 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..177a60e5c
--- /dev/null
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -0,0 +1,351 @@
+/*
+ * 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;
+ 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, NULL, tpm_buf.data, PAGE_SIZE,
+ READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
+ "attempting to read the PUBEK"))
+ goto out_buf;
+
+ 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");
+ }
+
+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];
+ ssize_t rc;
+ int i, j, num_pcrs;
+ char *str = buf;
+ struct tpm_chip *chip = to_tpm_chip(dev);
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm_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++) {
+ 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");
+ }
+ 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 (tpm_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 (tpm_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 (tpm_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 (tpm_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);
+ ssize_t rc = 0;
+ char *str = buf;
+ cap_t cap;
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm_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));
+
+ /* 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 */
+ if (tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
+ "attempting to determine the 1.1 version",
+ sizeof(cap.tpm_version)))
+ goto out_ops;
+
+ 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);
+}
+ 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 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 17:06:45 +0000