/* * Copyright (C) 2004 IBM Corporation * * Authors: * Leendert van Doorn * Dave Safford * Reiner Sailer * Kylene Hall * * Maintained by: * * Device driver for TCG/TCPA TPM (trusted platform module). * Specifications at www.trustedcomputinggroup.org * * 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. * * Note, the TPM chip is not interrupt driven (only polling) * and can have very long timeouts (minutes!). Hence the unusual * calls to msleep. * */ #include #include #include #include "tpm.h" enum tpm_const { TPM_MINOR = 224, /* officially assigned */ TPM_BUFSIZE = 2048, TPM_NUM_DEVICES = 256, }; enum tpm_duration { TPM_SHORT = 0, TPM_MEDIUM = 1, TPM_LONG = 2, TPM_UNDEFINED, }; #define TPM_MAX_ORDINAL 243 #define TPM_MAX_PROTECTED_ORDINAL 12 #define TPM_PROTECTED_ORDINAL_MASK 0xFF static LIST_HEAD(tpm_chip_list); static DEFINE_SPINLOCK(driver_lock); static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES); /* * Array with one entry per ordinal defining the maximum amount * of time the chip could take to return the result. The ordinal * designation of short, medium or long is defined in a table in * TCG Specification TPM Main Part 2 TPM Structures Section 17. The * values of the SHORT, MEDIUM, and LONG durations are retrieved * from the chip during initialization with a call to tpm_get_timeouts. */ static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = { TPM_UNDEFINED, /* 0 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 5 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 10 */ TPM_SHORT, }; static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = { TPM_UNDEFINED, /* 0 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 5 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 10 */ TPM_SHORT, TPM_MEDIUM, TPM_LONG, TPM_LONG, TPM_MEDIUM, /* 15 */ TPM_SHORT, TPM_SHORT, TPM_MEDIUM, TPM_LONG, TPM_SHORT, /* 20 */ TPM_SHORT, TPM_MEDIUM, TPM_MEDIUM, TPM_MEDIUM, TPM_SHORT, /* 25 */ TPM_SHORT, TPM_MEDIUM, TPM_SHORT, TPM_SHORT, TPM_MEDIUM, /* 30 */ TPM_LONG, TPM_MEDIUM, TPM_SHORT, TPM_SHORT, TPM_SHORT, /* 35 */ TPM_MEDIUM, TPM_MEDIUM, TPM_UNDEFINED, TPM_UNDEFINED, TPM_MEDIUM, /* 40 */ TPM_LONG, TPM_MEDIUM, TPM_SHORT, TPM_SHORT, TPM_SHORT, /* 45 */ TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_LONG, TPM_MEDIUM, /* 50 */ TPM_MEDIUM, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 55 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_MEDIUM, /* 60 */ TPM_MEDIUM, TPM_MEDIUM, TPM_SHORT, TPM_SHORT, TPM_MEDIUM, /* 65 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 70 */ TPM_SHORT, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 75 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_LONG, /* 80 */ TPM_UNDEFINED, TPM_MEDIUM, TPM_LONG, TPM_SHORT, TPM_UNDEFINED, /* 85 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 90 */ TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_UNDEFINED, /* 95 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_MEDIUM, /* 100 */ TPM_SHORT, TPM_SHORT, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 105 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 110 */ TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_SHORT, /* 115 */ TPM_SHORT, TPM_SHORT, TPM_UNDEFINED, TPM_UNDEFINED, TPM_LONG, /* 120 */ TPM_LONG, TPM_MEDIUM, TPM_UNDEFINED, TPM_SHORT, TPM_SHORT, /* 125 */ TPM_SHORT, TPM_LONG, TPM_SHORT, TPM_SHORT, TPM_SHORT, /* 130 */ TPM_MEDIUM, TPM_UNDEFINED, TPM_SHORT, TPM_MEDIUM, TPM_UNDEFINED, /* 135 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 140 */ TPM_SHORT, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 145 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 150 */ TPM_MEDIUM, TPM_MEDIUM, TPM_SHORT, TPM_SHORT, TPM_UNDEFINED, /* 155 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 160 */ TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_UNDEFINED, TPM_UNDEFINED, /* 165 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_LONG, /* 170 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 175 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_MEDIUM, /* 180 */ TPM_SHORT, TPM_MEDIUM, TPM_MEDIUM, TPM_MEDIUM, TPM_MEDIUM, /* 185 */ TPM_SHORT, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 190 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 195 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 200 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, TPM_SHORT, /* 205 */ TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_MEDIUM, /* 210 */ TPM_UNDEFINED, TPM_MEDIUM, TPM_MEDIUM, TPM_MEDIUM, TPM_UNDEFINED, /* 215 */ TPM_MEDIUM, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, TPM_SHORT, /* 220 */ TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_SHORT, TPM_UNDEFINED, /* 225 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 230 */ TPM_LONG, TPM_MEDIUM, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, /* 235 */ TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_UNDEFINED, TPM_SHORT, /* 240 */ TPM_UNDEFINED, TPM_MEDIUM, }; static void user_reader_timeout(unsigned long ptr) { struct tpm_chip *chip = (struct tpm_chip *) ptr; schedule_work(&chip->work); } static void timeout_work(struct work_struct *work) { struct tpm_chip *chip = container_of(work, struct tpm_chip, work); down(&chip->buffer_mutex); atomic_set(&chip->data_pending, 0); memset(chip->data_buffer, 0, TPM_BUFSIZE); up(&chip->buffer_mutex); } /* * Returns max number of jiffies to wait */ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal) { int duration_idx = TPM_UNDEFINED; int duration = 0; if (ordinal < TPM_MAX_ORDINAL) duration_idx = tpm_ordinal_duration[ordinal]; else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) < TPM_MAX_PROTECTED_ORDINAL) duration_idx = tpm_protected_ordinal_duration[ordinal & TPM_PROTECTED_ORDINAL_MASK]; if (duration_idx != TPM_UNDEFINED) duration = chip->vendor.duration[duration_idx]; if (duration <= 0) return 2 * 60 * HZ; else return duration; } EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration); /* * Internal kernel interface to transmit TPM commands */ static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, size_t bufsiz) { ssize_t rc; u32 count, ordinal; unsigned long stop; count = be32_to_cpu(*((__be32 *) (buf + 2))); ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); if (count == 0) return -ENODATA; if (count > bufsiz) { dev_err(chip->dev, "invalid count value %x %zx \n", count, bufsiz); return -E2BIG; } down(&chip->tpm_mutex); if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) { dev_err(chip->dev, "tpm_transmit: tpm_send: error %zd\n", rc); goto out; } if (chip->vendor.irq) goto out_recv; stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal); do { u8 status = chip->vendor.status(chip); if ((status & chip->vendor.req_complete_mask) == chip->vendor.req_complete_val) goto out_recv; if ((status == chip->vendor.req_canceled)) { dev_err(chip->dev, "Operation Canceled\n"); rc = -ECANCELED; goto out; } msleep(TPM_TIMEOUT); /* CHECK */ rmb(); } while (time_before(jiffies, stop)); chip->vendor.cancel(chip); dev_err(chip->dev, "Operation Timed out\n"); rc = -ETIME; goto out; out_recv: rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz); if (rc < 0) dev_err(chip->dev, "tpm_transmit: tpm_recv: error %zd\n", rc); out: up(&chip->tpm_mutex); return rc; } #define TPM_DIGEST_SIZE 20 #define TPM_ERROR_SIZE 10 #define TPM_RET_CODE_IDX 6 #define TPM_GET_CAP_RET_SIZE_IDX 10 #define TPM_GET_CAP_RET_UINT32_1_IDX 14 #define TPM_GET_CAP_RET_UINT32_2_IDX 18 #define TPM_GET_CAP_RET_UINT32_3_IDX 22 #define TPM_GET_CAP_RET_UINT32_4_IDX 26 #define TPM_GET_CAP_PERM_DISABLE_IDX 16 #define TPM_GET_CAP_PERM_INACTIVE_IDX 18 #define TPM_GET_CAP_RET_BOOL_1_IDX 14 #define TPM_GET_CAP_TEMP_INACTIVE_IDX 16 #define TPM_CAP_IDX 13 #define TPM_CAP_SUBCAP_IDX 21 enum tpm_capabilities { TPM_CAP_FLAG = 4, TPM_CAP_PROP = 5, }; enum tpm_sub_capabilities { TPM_CAP_PROP_PCR = 0x1, TPM_CAP_PROP_MANUFACTURER = 0x3, TPM_CAP_FLAG_PERM = 0x8, TPM_CAP_FLAG_VOL = 0x9, TPM_CAP_PROP_OWNER = 0x11, TPM_CAP_PROP_TIS_TIMEOUT = 0x15, TPM_CAP_PROP_TIS_DURATION = 0x20, }; /* * This is a semi generic GetCapability command for use * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG * and their associated sub_capabilities. */ static const u8 tpm_cap[] = { 0, 193, /* TPM_TAG_RQU_COMMAND */ 0, 0, 0, 22, /* length */ 0, 0, 0, 101, /* TPM_ORD_GetCapability */ 0, 0, 0, 0, /* TPM_CAP_ */ 0, 0, 0, 4, /* TPM_CAP_SUB_ size */ 0, 0, 1, 0 /* TPM_CAP_SUB_ */ }; static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len, char *desc) { int err; len = tpm_transmit(chip, data, len); if (len < 0) return len; if (len == TPM_ERROR_SIZE) { err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))); dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); return err; } return 0; } void tpm_gen_interrupt(struct tpm_chip *chip) { u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)]; ssize_t rc; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_PROP; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT; rc = transmit_cmd(chip, data, sizeof(data), "attempting to determine the timeouts"); } EXPORT_SYMBOL_GPL(tpm_gen_interrupt); void tpm_get_timeouts(struct tpm_chip *chip) { u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)]; ssize_t rc; u32 timeout; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_PROP; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT; rc = transmit_cmd(chip, data, sizeof(data), "attempting to determine the timeouts"); if (rc) goto duration; if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX))) != 4 * sizeof(u32)) goto duration; /* Don't overwrite default if value is 0 */ timeout = be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))); if (timeout) chip->vendor.timeout_a = msecs_to_jiffies(timeout); timeout = be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX))); if (timeout) chip->vendor.timeout_b = msecs_to_jiffies(timeout); timeout = be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX))); if (timeout) chip->vendor.timeout_c = msecs_to_jiffies(timeout); timeout = be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX))); if (timeout) chip->vendor.timeout_d = msecs_to_jiffies(timeout); duration: memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_PROP; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION; rc = transmit_cmd(chip, data, sizeof(data), "attempting to determine the durations"); if (rc) return; if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX))) != 3 * sizeof(u32)) return; chip->vendor.duration[TPM_SHORT] = msecs_to_jiffies(be32_to_cpu (*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); chip->vendor.duration[TPM_MEDIUM] = msecs_to_jiffies(be32_to_cpu (*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)))); chip->vendor.duration[TPM_LONG] = msecs_to_jiffies(be32_to_cpu (*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)))); } EXPORT_SYMBOL_GPL(tpm_get_timeouts); void tpm_continue_selftest(struct tpm_chip *chip) { u8 data[] = { 0, 193, /* TPM_TAG_RQU_COMMAND */ 0, 0, 0, 10, /* length */ 0, 0, 0, 83, /* TPM_ORD_GetCapability */ }; tpm_transmit(chip, data, sizeof(data)); } EXPORT_SYMBOL_GPL(tpm_continue_selftest); ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, char *buf) { u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)]; ssize_t rc; struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_FLAG; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM; rc = transmit_cmd(chip, data, sizeof(data), "attemtping to determine the permanent state"); if (rc) return 0; return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]); } EXPORT_SYMBOL_GPL(tpm_show_enabled); ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr, char *buf) { u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)]; ssize_t rc; struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_FLAG; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM; rc = transmit_cmd(chip, data, sizeof(data), "attemtping to determine the permanent state"); if (rc) return 0; return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]); } EXPORT_SYMBOL_GPL(tpm_show_active); ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr, char *buf) { u8 data[sizeof(tpm_cap)]; ssize_t rc; struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_PROP; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER; rc = transmit_cmd(chip, data, sizeof(data), "attempting to determine the owner state"); if (rc) return 0; return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]); } EXPORT_SYMBOL_GPL(tpm_show_owned); ssize_t tpm_show_temp_deactivated(struct device * dev, struct device_attribute * attr, char *buf) { u8 data[sizeof(tpm_cap)]; ssize_t rc; struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_FLAG; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL; rc = transmit_cmd(chip, data, sizeof(data), "attempting to determine the temporary state"); if (rc) return 0; return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]); } EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated); static const u8 pcrread[] = { 0, 193, /* TPM_TAG_RQU_COMMAND */ 0, 0, 0, 14, /* length */ 0, 0, 0, 21, /* TPM_ORD_PcrRead */ 0, 0, 0, 0 /* PCR index */ }; ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, char *buf) { u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)]; ssize_t rc; int i, j, num_pcrs; __be32 index; char *str = buf; struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_PROP; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR; rc = transmit_cmd(chip, data, sizeof(data), "attempting to determine the number of PCRS"); if (rc) return 0; num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); for (i = 0; i < num_pcrs; i++) { memcpy(data, pcrread, sizeof(pcrread)); index = cpu_to_be32(i); memcpy(data + 10, &index, 4); rc = transmit_cmd(chip, data, sizeof(data), "attempting to read a PCR"); if (rc) goto out; str += sprintf(str, "PCR-%02d: ", i); for (j = 0; j < TPM_DIGEST_SIZE; j++) str += sprintf(str, "%02X ", *(data + 10 + j)); str += sprintf(str, "\n"); } out: return str - buf; } EXPORT_SYMBOL_GPL(tpm_show_pcrs); #define READ_PUBEK_RESULT_SIZE 314 static const u8 readpubek[] = { 0, 193, /* TPM_TAG_RQU_COMMAND */ 0, 0, 0, 30, /* length */ 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ }; ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, char *buf) { u8 *data; ssize_t err; int i, rc; char *str = buf; struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); if (!data) return -ENOMEM; memcpy(data, readpubek, sizeof(readpubek)); err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE, "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 */ str += sprintf(str, "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" " %02X %02X %02X %02X %02X %02X %02X %02X\n" "Modulus length: %d\nModulus: \n", data[10], data[11], data[12], data[13], data[14], data[15], data[16], data[17], data[22], data[23], data[24], data[25], data[26], data[27], data[28], data[29], data[30], data[31], data[32], data[33], be32_to_cpu(*((__be32 *) (data + 34)))); for (i = 0; i < 256; i++) { str += sprintf(str, "%02X ", data[i + 38]); if ((i + 1) % 16 == 0) str += sprintf(str, "\n"); } out: rc = str - buf; kfree(data); return rc; } EXPORT_SYMBOL_GPL(tpm_show_pubek); #define CAP_VERSION_1_1 6 #define CAP_VERSION_1_2 0x1A #define CAP_VERSION_IDX 13 static const u8 cap_version[] = { 0, 193, /* TPM_TAG_RQU_COMMAND */ 0, 0, 0, 18, /* length */ 0, 0, 0, 101, /* TPM_ORD_GetCapability */ 0, 0, 0, 0, 0, 0, 0, 0 }; ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, char *buf) { u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)]; ssize_t rc; char *str = buf; struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_PROP; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; rc = transmit_cmd(chip, data, sizeof(data), "attempting to determine the manufacturer"); if (rc) return 0; str += sprintf(str, "Manufacturer: 0x%x\n", be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); memcpy(data, cap_version, sizeof(cap_version)); data[CAP_VERSION_IDX] = CAP_VERSION_1_1; rc = transmit_cmd(chip, data, sizeof(data), "attempting to determine the 1.1 version"); if (rc) goto out; str += sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", (int) data[14], (int) data[15], (int) data[16], (int) data[17]); out: return str - buf; } EXPORT_SYMBOL_GPL(tpm_show_caps); ssize_t tpm_show_caps_1_2(struct device * dev, struct device_attribute * attr, char *buf) { u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)]; ssize_t len; char *str = buf; struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; memcpy(data, tpm_cap, sizeof(tpm_cap)); data[TPM_CAP_IDX] = TPM_CAP_PROP; data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; if ((len = tpm_transmit(chip, data, sizeof(data))) <= TPM_ERROR_SIZE) { dev_dbg(chip->dev, "A TPM error (%d) occurred " "attempting to determine the manufacturer\n", be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)))); return 0; } str += sprintf(str, "Manufacturer: 0x%x\n", be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); memcpy(data, cap_version, sizeof(cap_version)); data[CAP_VERSION_IDX] = CAP_VERSION_1_2; if ((len = tpm_transmit(chip, data, sizeof(data))) <= TPM_ERROR_SIZE) { dev_err(chip->dev, "A TPM error (%d) occurred " "attempting to determine the 1.2 version\n", be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)))); goto out; } str += sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", (int) data[16], (int) data[17], (int) data[18], (int) data[19]); out: return str - buf; } EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return 0; chip->vendor.cancel(chip); return count; } EXPORT_SYMBOL_GPL(tpm_store_cancel); /* * Device file system interface to the TPM */ int tpm_open(struct inode *inode, struct file *file) { int rc = 0, minor = iminor(inode); struct tpm_chip *chip = NULL, *pos; spin_lock(&driver_lock); list_for_each_entry(pos, &tpm_chip_list, list) { if (pos->vendor.miscdev.minor == minor) { chip = pos; break; } } if (chip == NULL) { rc = -ENODEV; goto err_out; } if (chip->num_opens) { dev_dbg(chip->dev, "Another process owns this TPM\n"); rc = -EBUSY; goto err_out; } chip->num_opens++; get_device(chip->dev); spin_unlock(&driver_lock); chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); if (chip->data_buffer == NULL) { chip->num_opens--; put_device(chip->dev); return -ENOMEM; } atomic_set(&chip->data_pending, 0); file->private_data = chip; return 0; err_out: spin_unlock(&driver_lock); return rc; } EXPORT_SYMBOL_GPL(tpm_open); int tpm_release(struct inode *inode, struct file *file) { struct tpm_chip *chip = file->private_data; spin_lock(&driver_lock); file->private_data = NULL; chip->num_opens--; del_singleshot_timer_sync(&chip->user_read_timer); flush_scheduled_work(); atomic_set(&chip->data_pending, 0); put_device(chip->dev); kfree(chip->data_buffer); spin_unlock(&driver_lock); return 0; } EXPORT_SYMBOL_GPL(tpm_release); ssize_t tpm_write(struct file *file, const char __user *buf, size_t size, loff_t *off) { struct tpm_chip *chip = file->private_data; int in_size = size, out_size; /* cannot perform a write until the read has cleared either via tpm_read or a user_read_timer timeout */ while (atomic_read(&chip->data_pending) != 0) msleep(TPM_TIMEOUT); down(&chip->buffer_mutex); if (in_size > TPM_BUFSIZE) in_size = TPM_BUFSIZE; if (copy_from_user (chip->data_buffer, (void __user *) buf, in_size)) { up(&chip->buffer_mutex); return -EFAULT; } /* atomic tpm command send and result receive */ out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); atomic_set(&chip->data_pending, out_size); up(&chip->buffer_mutex); /* Set a timeout by which the reader must come claim the result */ mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); return in_size; } EXPORT_SYMBOL_GPL(tpm_write); ssize_t tpm_read(struct file *file, char __user *buf, size_t size, loff_t *off) { struct tpm_chip *chip = file->private_data; int ret_size; del_singleshot_timer_sync(&chip->user_read_timer); flush_scheduled_work(); ret_size = atomic_read(&chip->data_pending); atomic_set(&chip->data_pending, 0); if (ret_size > 0) { /* relay data */ if (size < ret_size) ret_size = size; down(&chip->buffer_mutex); if (copy_to_user(buf, chip->data_buffer, ret_size)) ret_size = -EFAULT; up(&chip->buffer_mutex); } return ret_size; } EXPORT_SYMBOL_GPL(tpm_read); void tpm_remove_hardware(struct device *dev) { struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) { dev_err(dev, "No device data found\n"); return; } spin_lock(&driver_lock); list_del(&chip->list); spin_unlock(&driver_lock); dev_set_drvdata(dev, NULL); misc_deregister(&chip->vendor.miscdev); kfree(chip->vendor.miscdev.name); sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); tpm_bios_log_teardown(chip->bios_dir); clear_bit(chip->dev_num, dev_mask); kfree(chip); put_device(dev); } EXPORT_SYMBOL_GPL(tpm_remove_hardware); static u8 savestate[] = { 0, 193, /* TPM_TAG_RQU_COMMAND */ 0, 0, 0, 10, /* blob length (in bytes) */ 0, 0, 0, 152 /* TPM_ORD_SaveState */ }; /* * We are about to suspend. Save the TPM state * so that it can be restored. */ int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) { struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; tpm_transmit(chip, savestate, sizeof(savestate)); return 0; } EXPORT_SYMBOL_GPL(tpm_pm_suspend); /* * Resume from a power safe. The BIOS already restored * the TPM state. */ int tpm_pm_resume(struct device *dev) { struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return -ENODEV; return 0; } EXPORT_SYMBOL_GPL(tpm_pm_resume); /* * Called from tpm_.c probe function only for devices * the driver has determined it should claim. Prior to calling * this function the specific probe function has called pci_enable_device * upon errant exit from this function specific probe function should call * pci_disable_device */ struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific *entry) { #define DEVNAME_SIZE 7 char *devname; struct tpm_chip *chip; /* Driver specific per-device data */ chip = kzalloc(sizeof(*chip), GFP_KERNEL); if (chip == NULL) return NULL; init_MUTEX(&chip->buffer_mutex); init_MUTEX(&chip->tpm_mutex); INIT_LIST_HEAD(&chip->list); INIT_WORK(&chip->work, timeout_work); setup_timer(&chip->user_read_timer, user_reader_timeout, (unsigned long)chip); memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES); if (chip->dev_num >= TPM_NUM_DEVICES) { dev_err(dev, "No available tpm device numbers\n"); kfree(chip); return NULL; } else if (chip->dev_num == 0) chip->vendor.miscdev.minor = TPM_MINOR; else chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; set_bit(chip->dev_num, dev_mask); devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); chip->vendor.miscdev.name = devname; chip->vendor.miscdev.parent = dev; chip->dev = get_device(dev); if (misc_register(&chip->vendor.miscdev)) { dev_err(chip->dev, "unable to misc_register %s, minor %d\n", chip->vendor.miscdev.name, chip->vendor.miscdev.minor); put_device(dev); clear_bit(chip->dev_num, dev_mask); kfree(chip); kfree(devname); return NULL; } spin_lock(&driver_lock); dev_set_drvdata(dev, chip); list_add(&chip->list, &tpm_chip_list); spin_unlock(&driver_lock); if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { list_del(&chip->list); misc_deregister(&chip->vendor.miscdev); put_device(dev); clear_bit(chip->dev_num, dev_mask); kfree(chip); kfree(devname); return NULL; } chip->bios_dir = tpm_bios_log_setup(devname); return chip; } EXPORT_SYMBOL_GPL(tpm_register_hardware); MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); MODULE_DESCRIPTION("TPM Driver"); MODULE_VERSION("2.0"); MODULE_LICENSE("GPL");