tpm: TPM 2.0 baseline support
TPM 2.0 devices are separated by adding a field 'flags' to struct tpm_chip and defining a flag TPM_CHIP_FLAG_TPM2 for tagging them. This patch adds the following internal functions: - tpm2_get_random() - tpm2_get_tpm_pt() - tpm2_pcr_extend() - tpm2_pcr_read() - tpm2_startup() Additionally, the following exported functions are implemented for implementing TPM 2.0 device drivers: - tpm2_do_selftest() - tpm2_calc_ordinal_durations() - tpm2_gen_interrupt() The existing functions that are exported for the use for existing subsystems have been changed to check the flags field in struct tpm_chip and use appropriate TPM 2.0 counterpart if TPM_CHIP_FLAG_TPM2 is est. The code for tpm2_calc_ordinal_duration() and tpm2_startup() were originally written by Will Arthur. Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Will Arthur <will.c.arthur@intel.com> Reviewed-by: Jasob Gunthorpe <jason.gunthorpe@obsidianresearch.com> Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by: Peter Huewe <peterhuewe@gmx.de> Tested-by: Peter Huewe <peterhuewe@gmx.de> [phuewe: Fixed copy paste error * 2] Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
This commit is contained in:
Jarkko Sakkinen
Peter Huewe
parent
313d21eeab
commit
7a1d7e6dd7
@ -2,7 +2,7 @@
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# Makefile for the kernel tpm device drivers.
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#
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obj-$(CONFIG_TCG_TPM) += tpm.o
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tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o
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tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o
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tpm-$(CONFIG_ACPI) += tpm_ppi.o
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ifdef CONFIG_ACPI
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@ -195,15 +195,18 @@ int tpm_chip_register(struct tpm_chip *chip)
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if (rc)
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return rc;
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rc = tpm_sysfs_add_device(chip);
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if (rc)
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goto del_misc;
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/* Populate sysfs for TPM1 devices. */
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if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
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rc = tpm_sysfs_add_device(chip);
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if (rc)
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goto del_misc;
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rc = tpm_add_ppi(chip);
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if (rc)
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goto del_sysfs;
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rc = tpm_add_ppi(chip);
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if (rc)
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goto del_sysfs;
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chip->bios_dir = tpm_bios_log_setup(chip->devname);
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chip->bios_dir = tpm_bios_log_setup(chip->devname);
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}
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/* Make the chip available. */
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spin_lock(&driver_lock);
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@ -241,10 +244,12 @@ void tpm_chip_unregister(struct tpm_chip *chip)
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spin_unlock(&driver_lock);
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synchronize_rcu();
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if (chip->bios_dir)
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tpm_bios_log_teardown(chip->bios_dir);
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tpm_remove_ppi(chip);
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tpm_sysfs_del_device(chip);
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if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
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if (chip->bios_dir)
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tpm_bios_log_teardown(chip->bios_dir);
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tpm_remove_ppi(chip);
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tpm_sysfs_del_device(chip);
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}
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tpm_dev_del_device(chip);
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}
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@ -360,7 +360,10 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
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if (chip->vendor.irq)
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goto out_recv;
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stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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stop = jiffies + tpm2_calc_ordinal_duration(chip, ordinal);
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else
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stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
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do {
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u8 status = chip->ops->status(chip);
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if ((status & chip->ops->req_complete_mask) ==
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@ -484,6 +487,7 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
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{
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struct tpm_cmd_t start_cmd;
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start_cmd.header.in = tpm_startup_header;
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start_cmd.params.startup_in.startup_type = startup_type;
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return tpm_transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
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"attempting to start the TPM");
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@ -680,7 +684,10 @@ int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
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chip = tpm_chip_find_get(chip_num);
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if (chip == NULL)
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return -ENODEV;
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rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
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else
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rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
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tpm_chip_put(chip);
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return rc;
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}
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@ -714,6 +721,12 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
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if (chip == NULL)
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return -ENODEV;
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if (chip->flags & TPM_CHIP_FLAG_TPM2) {
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rc = tpm2_pcr_extend(chip, pcr_idx, hash);
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tpm_chip_put(chip);
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return rc;
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}
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cmd.header.in = pcrextend_header;
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cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
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memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
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@ -974,6 +987,12 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
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if (chip == NULL)
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return -ENODEV;
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if (chip->flags & TPM_CHIP_FLAG_TPM2) {
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err = tpm2_get_random(chip, out, max);
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tpm_chip_put(chip);
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return err;
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}
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do {
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tpm_cmd.header.in = tpm_getrandom_header;
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tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
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@ -62,6 +62,59 @@ enum tpm_duration {
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#define TPM_ERR_INVALID_POSTINIT 38
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#define TPM_HEADER_SIZE 10
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enum tpm2_const {
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TPM2_PLATFORM_PCR = 24,
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TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
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TPM2_TIMEOUT_A = 750,
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TPM2_TIMEOUT_B = 2000,
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TPM2_TIMEOUT_C = 200,
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TPM2_TIMEOUT_D = 30,
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TPM2_DURATION_SHORT = 20,
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TPM2_DURATION_MEDIUM = 750,
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TPM2_DURATION_LONG = 2000,
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};
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enum tpm2_structures {
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TPM2_ST_NO_SESSIONS = 0x8001,
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TPM2_ST_SESSIONS = 0x8002,
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};
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enum tpm2_return_codes {
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TPM2_RC_INITIALIZE = 0x0100,
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TPM2_RC_TESTING = 0x090A,
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TPM2_RC_DISABLED = 0x0120,
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};
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enum tpm2_algorithms {
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TPM2_ALG_SHA1 = 0x0004,
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};
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enum tpm2_command_codes {
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TPM2_CC_FIRST = 0x011F,
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TPM2_CC_SELF_TEST = 0x0143,
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TPM2_CC_STARTUP = 0x0144,
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TPM2_CC_SHUTDOWN = 0x0145,
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TPM2_CC_GET_CAPABILITY = 0x017A,
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TPM2_CC_GET_RANDOM = 0x017B,
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TPM2_CC_PCR_READ = 0x017E,
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TPM2_CC_PCR_EXTEND = 0x0182,
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TPM2_CC_LAST = 0x018F,
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};
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enum tpm2_permanent_handles {
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TPM2_RS_PW = 0x40000009,
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};
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enum tpm2_capabilities {
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TPM2_CAP_TPM_PROPERTIES = 6,
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};
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enum tpm2_startup_types {
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TPM2_SU_CLEAR = 0x0000,
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TPM2_SU_STATE = 0x0001,
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};
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struct tpm_chip;
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struct tpm_vendor_specific {
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@ -99,6 +152,7 @@ struct tpm_vendor_specific {
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enum tpm_chip_flags {
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TPM_CHIP_FLAG_REGISTERED = BIT(0),
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TPM_CHIP_FLAG_PPI = BIT(1),
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TPM_CHIP_FLAG_TPM2 = BIT(2),
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};
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struct tpm_chip {
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@ -370,3 +424,15 @@ static inline void tpm_remove_ppi(struct tpm_chip *chip)
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{
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}
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#endif
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int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
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int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
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int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
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ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
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u32 *value, const char *desc);
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extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
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extern int tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
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extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
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extern int tpm2_do_selftest(struct tpm_chip *chip);
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extern int tpm2_gen_interrupt(struct tpm_chip *chip, bool quiet);
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617
drivers/char/tpm/tpm2-cmd.c
Normal file
617
drivers/char/tpm/tpm2-cmd.c
Normal file
@ -0,0 +1,617 @@
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/*
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* Copyright (C) 2014 Intel Corporation
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*
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* Authors:
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* Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* This file contains TPM2 protocol implementations of the commands
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* used by the kernel internally.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#include "tpm.h"
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struct tpm2_startup_in {
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__be16 startup_type;
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} __packed;
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struct tpm2_self_test_in {
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u8 full_test;
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} __packed;
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struct tpm2_pcr_read_in {
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__be32 pcr_selects_cnt;
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__be16 hash_alg;
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u8 pcr_select_size;
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u8 pcr_select[TPM2_PCR_SELECT_MIN];
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} __packed;
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struct tpm2_pcr_read_out {
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__be32 update_cnt;
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__be32 pcr_selects_cnt;
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__be16 hash_alg;
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u8 pcr_select_size;
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u8 pcr_select[TPM2_PCR_SELECT_MIN];
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__be32 digests_cnt;
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__be16 digest_size;
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u8 digest[TPM_DIGEST_SIZE];
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} __packed;
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struct tpm2_null_auth_area {
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__be32 handle;
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__be16 nonce_size;
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u8 attributes;
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__be16 auth_size;
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} __packed;
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struct tpm2_pcr_extend_in {
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__be32 pcr_idx;
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__be32 auth_area_size;
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struct tpm2_null_auth_area auth_area;
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__be32 digest_cnt;
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__be16 hash_alg;
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u8 digest[TPM_DIGEST_SIZE];
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} __packed;
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struct tpm2_get_tpm_pt_in {
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__be32 cap_id;
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__be32 property_id;
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__be32 property_cnt;
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} __packed;
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struct tpm2_get_tpm_pt_out {
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u8 more_data;
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__be32 subcap_id;
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__be32 property_cnt;
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__be32 property_id;
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__be32 value;
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} __packed;
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struct tpm2_get_random_in {
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__be16 size;
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} __packed;
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struct tpm2_get_random_out {
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__be16 size;
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u8 buffer[TPM_MAX_RNG_DATA];
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} __packed;
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union tpm2_cmd_params {
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struct tpm2_startup_in startup_in;
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struct tpm2_self_test_in selftest_in;
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struct tpm2_pcr_read_in pcrread_in;
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struct tpm2_pcr_read_out pcrread_out;
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struct tpm2_pcr_extend_in pcrextend_in;
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struct tpm2_get_tpm_pt_in get_tpm_pt_in;
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struct tpm2_get_tpm_pt_out get_tpm_pt_out;
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struct tpm2_get_random_in getrandom_in;
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struct tpm2_get_random_out getrandom_out;
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};
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struct tpm2_cmd {
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tpm_cmd_header header;
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union tpm2_cmd_params params;
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} __packed;
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/*
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* Array with one entry per ordinal defining the maximum amount
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* of time the chip could take to return the result. The values
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* of the SHORT, MEDIUM, and LONG durations are taken from the
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* PC Client Profile (PTP) specification.
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*/
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static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
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TPM_UNDEFINED, /* 11F */
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TPM_UNDEFINED, /* 120 */
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TPM_LONG, /* 121 */
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TPM_UNDEFINED, /* 122 */
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TPM_UNDEFINED, /* 123 */
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TPM_UNDEFINED, /* 124 */
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TPM_UNDEFINED, /* 125 */
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TPM_UNDEFINED, /* 126 */
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TPM_UNDEFINED, /* 127 */
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TPM_UNDEFINED, /* 128 */
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TPM_LONG, /* 129 */
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TPM_UNDEFINED, /* 12a */
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TPM_UNDEFINED, /* 12b */
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TPM_UNDEFINED, /* 12c */
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TPM_UNDEFINED, /* 12d */
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TPM_UNDEFINED, /* 12e */
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TPM_UNDEFINED, /* 12f */
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TPM_UNDEFINED, /* 130 */
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TPM_UNDEFINED, /* 131 */
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TPM_UNDEFINED, /* 132 */
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TPM_UNDEFINED, /* 133 */
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TPM_UNDEFINED, /* 134 */
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TPM_UNDEFINED, /* 135 */
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TPM_UNDEFINED, /* 136 */
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TPM_UNDEFINED, /* 137 */
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TPM_UNDEFINED, /* 138 */
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TPM_UNDEFINED, /* 139 */
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TPM_UNDEFINED, /* 13a */
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TPM_UNDEFINED, /* 13b */
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TPM_UNDEFINED, /* 13c */
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TPM_UNDEFINED, /* 13d */
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TPM_MEDIUM, /* 13e */
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TPM_UNDEFINED, /* 13f */
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TPM_UNDEFINED, /* 140 */
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TPM_UNDEFINED, /* 141 */
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TPM_UNDEFINED, /* 142 */
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TPM_LONG, /* 143 */
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TPM_MEDIUM, /* 144 */
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TPM_UNDEFINED, /* 145 */
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TPM_UNDEFINED, /* 146 */
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TPM_UNDEFINED, /* 147 */
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TPM_UNDEFINED, /* 148 */
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TPM_UNDEFINED, /* 149 */
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TPM_UNDEFINED, /* 14a */
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TPM_UNDEFINED, /* 14b */
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TPM_UNDEFINED, /* 14c */
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TPM_UNDEFINED, /* 14d */
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TPM_LONG, /* 14e */
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TPM_UNDEFINED, /* 14f */
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TPM_UNDEFINED, /* 150 */
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TPM_UNDEFINED, /* 151 */
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TPM_UNDEFINED, /* 152 */
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TPM_UNDEFINED, /* 153 */
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TPM_UNDEFINED, /* 154 */
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TPM_UNDEFINED, /* 155 */
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TPM_UNDEFINED, /* 156 */
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TPM_UNDEFINED, /* 157 */
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TPM_UNDEFINED, /* 158 */
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TPM_UNDEFINED, /* 159 */
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TPM_UNDEFINED, /* 15a */
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TPM_UNDEFINED, /* 15b */
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TPM_MEDIUM, /* 15c */
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TPM_UNDEFINED, /* 15d */
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TPM_UNDEFINED, /* 15e */
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TPM_UNDEFINED, /* 15f */
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TPM_UNDEFINED, /* 160 */
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TPM_UNDEFINED, /* 161 */
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TPM_UNDEFINED, /* 162 */
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TPM_UNDEFINED, /* 163 */
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TPM_UNDEFINED, /* 164 */
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TPM_UNDEFINED, /* 165 */
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TPM_UNDEFINED, /* 166 */
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TPM_UNDEFINED, /* 167 */
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TPM_UNDEFINED, /* 168 */
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TPM_UNDEFINED, /* 169 */
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TPM_UNDEFINED, /* 16a */
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TPM_UNDEFINED, /* 16b */
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TPM_UNDEFINED, /* 16c */
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TPM_UNDEFINED, /* 16d */
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TPM_UNDEFINED, /* 16e */
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TPM_UNDEFINED, /* 16f */
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TPM_UNDEFINED, /* 170 */
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TPM_UNDEFINED, /* 171 */
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TPM_UNDEFINED, /* 172 */
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TPM_UNDEFINED, /* 173 */
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TPM_UNDEFINED, /* 174 */
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TPM_UNDEFINED, /* 175 */
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TPM_UNDEFINED, /* 176 */
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TPM_LONG, /* 177 */
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TPM_UNDEFINED, /* 178 */
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TPM_UNDEFINED, /* 179 */
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TPM_MEDIUM, /* 17a */
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TPM_LONG, /* 17b */
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TPM_UNDEFINED, /* 17c */
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TPM_UNDEFINED, /* 17d */
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TPM_UNDEFINED, /* 17e */
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TPM_UNDEFINED, /* 17f */
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TPM_UNDEFINED, /* 180 */
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TPM_UNDEFINED, /* 181 */
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TPM_MEDIUM, /* 182 */
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TPM_UNDEFINED, /* 183 */
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TPM_UNDEFINED, /* 184 */
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TPM_MEDIUM, /* 185 */
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TPM_MEDIUM, /* 186 */
|
||||
TPM_UNDEFINED, /* 187 */
|
||||
TPM_UNDEFINED, /* 188 */
|
||||
TPM_UNDEFINED, /* 189 */
|
||||
TPM_UNDEFINED, /* 18a */
|
||||
TPM_UNDEFINED, /* 18b */
|
||||
TPM_UNDEFINED, /* 18c */
|
||||
TPM_UNDEFINED, /* 18d */
|
||||
TPM_UNDEFINED, /* 18e */
|
||||
TPM_UNDEFINED /* 18f */
|
||||
};
|
||||
|
||||
#define TPM2_PCR_READ_IN_SIZE \
|
||||
(sizeof(struct tpm_input_header) + \
|
||||
sizeof(struct tpm2_pcr_read_in))
|
||||
|
||||
static const struct tpm_input_header tpm2_pcrread_header = {
|
||||
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
|
||||
.length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE),
|
||||
.ordinal = cpu_to_be32(TPM2_CC_PCR_READ)
|
||||
};
|
||||
|
||||
/**
|
||||
* tpm2_pcr_read() - read a PCR value
|
||||
* @chip: TPM chip to use.
|
||||
* @pcr_idx: index of the PCR to read.
|
||||
* @ref_buf: buffer to store the resulting hash,
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
|
||||
{
|
||||
int rc;
|
||||
struct tpm2_cmd cmd;
|
||||
u8 *buf;
|
||||
|
||||
if (pcr_idx >= TPM2_PLATFORM_PCR)
|
||||
return -EINVAL;
|
||||
|
||||
cmd.header.in = tpm2_pcrread_header;
|
||||
cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
|
||||
cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
|
||||
cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
|
||||
|
||||
memset(cmd.params.pcrread_in.pcr_select, 0,
|
||||
sizeof(cmd.params.pcrread_in.pcr_select));
|
||||
cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
|
||||
|
||||
rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
|
||||
"attempting to read a pcr value");
|
||||
if (rc == 0) {
|
||||
buf = cmd.params.pcrread_out.digest;
|
||||
memcpy(res_buf, buf, TPM_DIGEST_SIZE);
|
||||
}
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
#define TPM2_GET_PCREXTEND_IN_SIZE \
|
||||
(sizeof(struct tpm_input_header) + \
|
||||
sizeof(struct tpm2_pcr_extend_in))
|
||||
|
||||
static const struct tpm_input_header tpm2_pcrextend_header = {
|
||||
.tag = cpu_to_be16(TPM2_ST_SESSIONS),
|
||||
.length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
|
||||
.ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
|
||||
};
|
||||
|
||||
/**
|
||||
* tpm2_pcr_extend() - extend a PCR value
|
||||
* @chip: TPM chip to use.
|
||||
* @pcr_idx: index of the PCR.
|
||||
* @hash: hash value to use for the extend operation.
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
|
||||
{
|
||||
struct tpm2_cmd cmd;
|
||||
int rc;
|
||||
|
||||
cmd.header.in = tpm2_pcrextend_header;
|
||||
cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
|
||||
cmd.params.pcrextend_in.auth_area_size =
|
||||
cpu_to_be32(sizeof(struct tpm2_null_auth_area));
|
||||
cmd.params.pcrextend_in.auth_area.handle =
|
||||
cpu_to_be32(TPM2_RS_PW);
|
||||
cmd.params.pcrextend_in.auth_area.nonce_size = 0;
|
||||
cmd.params.pcrextend_in.auth_area.attributes = 0;
|
||||
cmd.params.pcrextend_in.auth_area.auth_size = 0;
|
||||
cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
|
||||
cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
|
||||
memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
|
||||
|
||||
rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
|
||||
"attempting extend a PCR value");
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
#define TPM2_GETRANDOM_IN_SIZE \
|
||||
(sizeof(struct tpm_input_header) + \
|
||||
sizeof(struct tpm2_get_random_in))
|
||||
|
||||
static const struct tpm_input_header tpm2_getrandom_header = {
|
||||
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
|
||||
.length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE),
|
||||
.ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM)
|
||||
};
|
||||
|
||||
/**
|
||||
* tpm2_get_random() - get random bytes from the TPM RNG
|
||||
* @chip: TPM chip to use
|
||||
* @out: destination buffer for the random bytes
|
||||
* @max: the max number of bytes to write to @out
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
|
||||
{
|
||||
struct tpm2_cmd cmd;
|
||||
u32 recd;
|
||||
u32 num_bytes;
|
||||
int err;
|
||||
int total = 0;
|
||||
int retries = 5;
|
||||
u8 *dest = out;
|
||||
|
||||
num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer));
|
||||
|
||||
if (!out || !num_bytes ||
|
||||
max > sizeof(cmd.params.getrandom_out.buffer))
|
||||
return -EINVAL;
|
||||
|
||||
do {
|
||||
cmd.header.in = tpm2_getrandom_header;
|
||||
cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
|
||||
|
||||
err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
|
||||
"attempting get random");
|
||||
if (err)
|
||||
break;
|
||||
|
||||
recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size),
|
||||
num_bytes);
|
||||
memcpy(dest, cmd.params.getrandom_out.buffer, recd);
|
||||
|
||||
dest += recd;
|
||||
total += recd;
|
||||
num_bytes -= recd;
|
||||
} while (retries-- && total < max);
|
||||
|
||||
return total ? total : -EIO;
|
||||
}
|
||||
|
||||
#define TPM2_GET_TPM_PT_IN_SIZE \
|
||||
(sizeof(struct tpm_input_header) + \
|
||||
sizeof(struct tpm2_get_tpm_pt_in))
|
||||
|
||||
static const struct tpm_input_header tpm2_get_tpm_pt_header = {
|
||||
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
|
||||
.length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE),
|
||||
.ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY)
|
||||
};
|
||||
|
||||
/**
|
||||
* tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property
|
||||
* @chip: TPM chip to use.
|
||||
* @property_id: property ID.
|
||||
* @value: output variable.
|
||||
* @desc: passed to tpm_transmit_cmd()
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
|
||||
const char *desc)
|
||||
{
|
||||
struct tpm2_cmd cmd;
|
||||
int rc;
|
||||
|
||||
cmd.header.in = tpm2_get_tpm_pt_header;
|
||||
cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
|
||||
cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id);
|
||||
cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
|
||||
|
||||
rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), desc);
|
||||
if (!rc)
|
||||
*value = cmd.params.get_tpm_pt_out.value;
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
#define TPM2_STARTUP_IN_SIZE \
|
||||
(sizeof(struct tpm_input_header) + \
|
||||
sizeof(struct tpm2_startup_in))
|
||||
|
||||
static const struct tpm_input_header tpm2_startup_header = {
|
||||
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
|
||||
.length = cpu_to_be32(TPM2_STARTUP_IN_SIZE),
|
||||
.ordinal = cpu_to_be32(TPM2_CC_STARTUP)
|
||||
};
|
||||
|
||||
/**
|
||||
* tpm2_startup() - send startup command to the TPM chip
|
||||
* @chip: TPM chip to use.
|
||||
* @startup_type startup type. The value is either
|
||||
* TPM_SU_CLEAR or TPM_SU_STATE.
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
int tpm2_startup(struct tpm_chip *chip, u16 startup_type)
|
||||
{
|
||||
struct tpm2_cmd cmd;
|
||||
|
||||
cmd.header.in = tpm2_startup_header;
|
||||
|
||||
cmd.params.startup_in.startup_type = cpu_to_be16(startup_type);
|
||||
return tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
|
||||
"attempting to start the TPM");
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(tpm2_startup);
|
||||
|
||||
#define TPM2_SHUTDOWN_IN_SIZE \
|
||||
(sizeof(struct tpm_input_header) + \
|
||||
sizeof(struct tpm2_startup_in))
|
||||
|
||||
static const struct tpm_input_header tpm2_shutdown_header = {
|
||||
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
|
||||
.length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
|
||||
.ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
|
||||
};
|
||||
|
||||
/**
|
||||
* tpm2_shutdown() - send shutdown command to the TPM chip
|
||||
* @chip: TPM chip to use.
|
||||
* @shutdown_type shutdown type. The value is either
|
||||
* TPM_SU_CLEAR or TPM_SU_STATE.
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
int tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
|
||||
{
|
||||
struct tpm2_cmd cmd;
|
||||
|
||||
cmd.header.in = tpm2_shutdown_header;
|
||||
|
||||
cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
|
||||
return tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
|
||||
"stopping the TPM");
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(tpm2_shutdown);
|
||||
|
||||
/*
|
||||
* tpm2_calc_ordinal_duration() - maximum duration for a command
|
||||
* @chip: TPM chip to use.
|
||||
* @ordinal: command code number.
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
|
||||
{
|
||||
int index = TPM_UNDEFINED;
|
||||
int duration = 0;
|
||||
|
||||
if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST)
|
||||
index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST];
|
||||
|
||||
if (index != TPM_UNDEFINED)
|
||||
duration = chip->vendor.duration[index];
|
||||
|
||||
if (duration <= 0)
|
||||
duration = 2 * 60 * HZ;
|
||||
|
||||
return duration;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);
|
||||
|
||||
#define TPM2_SELF_TEST_IN_SIZE \
|
||||
(sizeof(struct tpm_input_header) + \
|
||||
sizeof(struct tpm2_self_test_in))
|
||||
|
||||
static const struct tpm_input_header tpm2_selftest_header = {
|
||||
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
|
||||
.length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE),
|
||||
.ordinal = cpu_to_be32(TPM2_CC_SELF_TEST)
|
||||
};
|
||||
|
||||
/**
|
||||
* tpm2_continue_selftest() - start a self test
|
||||
* @chip: TPM chip to use
|
||||
* @full: test all commands instead of testing only those that were not
|
||||
* previously tested.
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
|
||||
{
|
||||
int rc;
|
||||
struct tpm2_cmd cmd;
|
||||
|
||||
cmd.header.in = tpm2_selftest_header;
|
||||
cmd.params.selftest_in.full_test = full;
|
||||
|
||||
rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE,
|
||||
"continue selftest");
|
||||
|
||||
/* At least some prototype chips seem to give RC_TESTING error
|
||||
* immediately. This is a workaround for that.
|
||||
*/
|
||||
if (rc == TPM2_RC_TESTING) {
|
||||
dev_warn(chip->pdev, "Got RC_TESTING, ignoring\n");
|
||||
rc = 0;
|
||||
}
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* tpm2_do_selftest() - run a full self test
|
||||
* @chip: TPM chip to use
|
||||
*
|
||||
* During the self test TPM2 commands return with the error code RC_TESTING.
|
||||
* Waiting is done by issuing PCR read until it executes successfully.
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
int tpm2_do_selftest(struct tpm_chip *chip)
|
||||
{
|
||||
int rc;
|
||||
unsigned int loops;
|
||||
unsigned int delay_msec = 100;
|
||||
unsigned long duration;
|
||||
struct tpm2_cmd cmd;
|
||||
int i;
|
||||
|
||||
duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST);
|
||||
|
||||
loops = jiffies_to_msecs(duration) / delay_msec;
|
||||
|
||||
rc = tpm2_start_selftest(chip, true);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
for (i = 0; i < loops; i++) {
|
||||
/* Attempt to read a PCR value */
|
||||
cmd.header.in = tpm2_pcrread_header;
|
||||
cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
|
||||
cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
|
||||
cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
|
||||
cmd.params.pcrread_in.pcr_select[0] = 0x01;
|
||||
cmd.params.pcrread_in.pcr_select[1] = 0x00;
|
||||
cmd.params.pcrread_in.pcr_select[2] = 0x00;
|
||||
|
||||
rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL);
|
||||
if (rc < 0)
|
||||
break;
|
||||
|
||||
rc = be32_to_cpu(cmd.header.out.return_code);
|
||||
if (rc != TPM2_RC_TESTING)
|
||||
break;
|
||||
|
||||
msleep(delay_msec);
|
||||
}
|
||||
|
||||
return rc;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(tpm2_do_selftest);
|
||||
|
||||
/**
|
||||
* tpm2_gen_interrupt() - generate an interrupt
|
||||
* @chip: TPM chip to use
|
||||
* @quiet: surpress the error message
|
||||
*
|
||||
* 0 is returned when the operation is successful. If a negative number is
|
||||
* returned it remarks a POSIX error code. If a positive number is returned
|
||||
* it remarks a TPM error.
|
||||
*/
|
||||
int tpm2_gen_interrupt(struct tpm_chip *chip, bool quiet)
|
||||
{
|
||||
const char *desc = NULL;
|
||||
u32 dummy;
|
||||
|
||||
if (!quiet)
|
||||
desc = "attempting to generate an interrupt";
|
||||
|
||||
return tpm2_get_tpm_pt(chip, TPM2_CAP_TPM_PROPERTIES, &dummy, desc);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
|
||||
Loading…
Reference in New Issue
Block a user