2019-06-01 08:08:55 +00:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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2009-02-02 17:23:44 +00:00
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/*
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* Copyright (C) 2004,2007,2008 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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* Debora Velarde <dvelarde@us.ibm.com>
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*
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* Maintained by: <tpmdd_devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*/
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#ifndef __LINUX_TPM_H__
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#define __LINUX_TPM_H__
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2019-02-06 16:24:50 +00:00
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#include <linux/hw_random.h>
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#include <linux/acpi.h>
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#include <linux/cdev.h>
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#include <linux/fs.h>
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2019-10-16 05:14:52 +00:00
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#include <linux/highmem.h>
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2019-02-06 16:24:48 +00:00
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#include <crypto/hash_info.h>
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2013-05-21 14:40:47 +00:00
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#define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
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2019-02-06 16:24:48 +00:00
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#define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
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2013-05-21 14:40:47 +00:00
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2013-11-26 20:30:43 +00:00
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struct tpm_chip;
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2015-05-30 05:09:04 +00:00
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struct trusted_key_payload;
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struct trusted_key_options;
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2013-11-26 20:30:43 +00:00
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2019-02-06 16:24:48 +00:00
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enum tpm_algorithms {
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TPM_ALG_ERROR = 0x0000,
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TPM_ALG_SHA1 = 0x0004,
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TPM_ALG_KEYEDHASH = 0x0008,
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TPM_ALG_SHA256 = 0x000B,
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TPM_ALG_SHA384 = 0x000C,
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TPM_ALG_SHA512 = 0x000D,
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TPM_ALG_NULL = 0x0010,
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TPM_ALG_SM3_256 = 0x0012,
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};
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struct tpm_digest {
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u16 alg_id;
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u8 digest[TPM_MAX_DIGEST_SIZE];
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} __packed;
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tpm: retrieve digest size of unknown algorithms with PCR read
Currently, the TPM driver retrieves the digest size from a table mapping
TPM algorithms identifiers to identifiers defined by the crypto subsystem.
If the algorithm is not defined by the latter, the digest size can be
retrieved from the output of the PCR read command.
The patch modifies the definition of tpm_pcr_read() and tpm2_pcr_read() to
pass the desired hash algorithm and obtain the digest size at TPM startup.
Algorithms and corresponding digest sizes are stored in the new structure
tpm_bank_info, member of tpm_chip, so that the information can be used by
other kernel subsystems.
tpm_bank_info contains: the TPM algorithm identifier, necessary to generate
the event log as defined by Trusted Computing Group (TCG); the digest size,
to pad/truncate a digest calculated with a different algorithm; the crypto
subsystem identifier, to calculate the digest of event data.
This patch also protects against data corruption that could happen in the
bus, by checking that the digest size returned by the TPM during a PCR read
matches the size of the algorithm passed to tpm2_pcr_read().
For the initial PCR read, when digest sizes are not yet available, this
patch ensures that the amount of data copied from the output returned by
the TPM does not exceed the size of the array data are copied to.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
2019-02-06 16:24:49 +00:00
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struct tpm_bank_info {
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u16 alg_id;
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u16 digest_size;
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u16 crypto_id;
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};
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2016-07-12 17:41:49 +00:00
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enum TPM_OPS_FLAGS {
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TPM_OPS_AUTO_STARTUP = BIT(0),
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};
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2013-11-26 20:30:43 +00:00
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struct tpm_class_ops {
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2016-07-12 17:41:49 +00:00
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unsigned int flags;
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2013-11-26 20:30:43 +00:00
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const u8 req_complete_mask;
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const u8 req_complete_val;
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bool (*req_canceled)(struct tpm_chip *chip, u8 status);
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int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
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int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
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void (*cancel) (struct tpm_chip *chip);
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u8 (*status) (struct tpm_chip *chip);
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2019-01-30 22:06:58 +00:00
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void (*update_timeouts)(struct tpm_chip *chip,
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2014-05-22 00:26:44 +00:00
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unsigned long *timeout_cap);
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2019-09-02 14:27:34 +00:00
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void (*update_durations)(struct tpm_chip *chip,
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unsigned long *duration_cap);
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2018-06-28 15:13:33 +00:00
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int (*go_idle)(struct tpm_chip *chip);
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int (*cmd_ready)(struct tpm_chip *chip);
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2017-03-24 09:45:49 +00:00
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int (*request_locality)(struct tpm_chip *chip, int loc);
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2018-03-05 11:34:49 +00:00
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int (*relinquish_locality)(struct tpm_chip *chip, int loc);
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2017-12-22 20:13:44 +00:00
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void (*clk_enable)(struct tpm_chip *chip, bool value);
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2013-11-26 20:30:43 +00:00
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};
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2019-02-06 16:24:50 +00:00
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#define TPM_NUM_EVENT_LOG_FILES 3
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/* Indexes the duration array */
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enum tpm_duration {
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TPM_SHORT = 0,
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TPM_MEDIUM = 1,
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TPM_LONG = 2,
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TPM_LONG_LONG = 3,
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TPM_UNDEFINED,
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TPM_NUM_DURATIONS = TPM_UNDEFINED,
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};
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#define TPM_PPI_VERSION_LEN 3
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struct tpm_space {
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u32 context_tbl[3];
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u8 *context_buf;
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u32 session_tbl[3];
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u8 *session_buf;
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2020-07-02 22:55:59 +00:00
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u32 buf_size;
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2019-02-06 16:24:50 +00:00
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};
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struct tpm_bios_log {
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void *bios_event_log;
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void *bios_event_log_end;
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};
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struct tpm_chip_seqops {
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struct tpm_chip *chip;
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const struct seq_operations *seqops;
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};
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struct tpm_chip {
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struct device dev;
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struct device devs;
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struct cdev cdev;
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struct cdev cdevs;
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/* A driver callback under ops cannot be run unless ops_sem is held
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* (sometimes implicitly, eg for the sysfs code). ops becomes null
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* when the driver is unregistered, see tpm_try_get_ops.
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*/
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struct rw_semaphore ops_sem;
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const struct tpm_class_ops *ops;
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struct tpm_bios_log log;
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struct tpm_chip_seqops bin_log_seqops;
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struct tpm_chip_seqops ascii_log_seqops;
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unsigned int flags;
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int dev_num; /* /dev/tpm# */
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unsigned long is_open; /* only one allowed */
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char hwrng_name[64];
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struct hwrng hwrng;
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struct mutex tpm_mutex; /* tpm is processing */
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unsigned long timeout_a; /* jiffies */
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unsigned long timeout_b; /* jiffies */
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unsigned long timeout_c; /* jiffies */
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unsigned long timeout_d; /* jiffies */
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bool timeout_adjusted;
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unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
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bool duration_adjusted;
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struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
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const struct attribute_group *groups[3];
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unsigned int groups_cnt;
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u32 nr_allocated_banks;
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struct tpm_bank_info *allocated_banks;
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#ifdef CONFIG_ACPI
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acpi_handle acpi_dev_handle;
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char ppi_version[TPM_PPI_VERSION_LEN + 1];
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#endif /* CONFIG_ACPI */
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struct tpm_space work_space;
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u32 last_cc;
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u32 nr_commands;
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u32 *cc_attrs_tbl;
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/* active locality */
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int locality;
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};
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2019-10-16 05:14:52 +00:00
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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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};
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enum tpm2_timeouts {
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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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TPM2_DURATION_LONG_LONG = 300000,
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TPM2_DURATION_DEFAULT = 120000,
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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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/* Indicates from what layer of the software stack the error comes from */
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#define TSS2_RC_LAYER_SHIFT 16
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#define TSS2_RESMGR_TPM_RC_LAYER (11 << TSS2_RC_LAYER_SHIFT)
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enum tpm2_return_codes {
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TPM2_RC_SUCCESS = 0x0000,
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TPM2_RC_HASH = 0x0083, /* RC_FMT1 */
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TPM2_RC_HANDLE = 0x008B,
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TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */
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TPM2_RC_FAILURE = 0x0101,
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TPM2_RC_DISABLED = 0x0120,
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TPM2_RC_COMMAND_CODE = 0x0143,
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TPM2_RC_TESTING = 0x090A, /* RC_WARN */
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TPM2_RC_REFERENCE_H0 = 0x0910,
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TPM2_RC_RETRY = 0x0922,
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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_HIERARCHY_CONTROL = 0x0121,
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TPM2_CC_HIERARCHY_CHANGE_AUTH = 0x0129,
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TPM2_CC_CREATE_PRIMARY = 0x0131,
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TPM2_CC_SEQUENCE_COMPLETE = 0x013E,
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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_NV_READ = 0x014E,
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TPM2_CC_CREATE = 0x0153,
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TPM2_CC_LOAD = 0x0157,
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TPM2_CC_SEQUENCE_UPDATE = 0x015C,
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TPM2_CC_UNSEAL = 0x015E,
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TPM2_CC_CONTEXT_LOAD = 0x0161,
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TPM2_CC_CONTEXT_SAVE = 0x0162,
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TPM2_CC_FLUSH_CONTEXT = 0x0165,
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TPM2_CC_VERIFY_SIGNATURE = 0x0177,
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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_EVENT_SEQUENCE_COMPLETE = 0x0185,
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TPM2_CC_HASH_SEQUENCE_START = 0x0186,
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TPM2_CC_CREATE_LOADED = 0x0191,
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TPM2_CC_LAST = 0x0193, /* Spec 1.36 */
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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_HANDLES = 1,
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TPM2_CAP_COMMANDS = 2,
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TPM2_CAP_PCRS = 5,
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TPM2_CAP_TPM_PROPERTIES = 6,
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};
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enum tpm2_properties {
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TPM_PT_TOTAL_COMMANDS = 0x0129,
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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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enum tpm2_cc_attrs {
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TPM2_CC_ATTR_CHANDLES = 25,
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TPM2_CC_ATTR_RHANDLE = 28,
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};
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#define TPM_VID_INTEL 0x8086
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#define TPM_VID_WINBOND 0x1050
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#define TPM_VID_STM 0x104A
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tpm: fix Atmel TPM crash caused by too frequent queries
[ Upstream commit 79ca6f74dae067681a779fd573c2eb59649989bc ]
The Atmel TPM 1.2 chips crash with error
`tpm_try_transmit: send(): error -62` since kernel 4.14.
It is observed from the kernel log after running `tpm_sealdata -z`.
The error thrown from the command is as follows
```
$ tpm_sealdata -z
Tspi_Key_LoadKey failed: 0x00001087 - layer=tddl,
code=0087 (135), I/O error
```
The issue was reproduced with the following Atmel TPM chip:
```
$ tpm_version
T0 TPM 1.2 Version Info:
Chip Version: 1.2.66.1
Spec Level: 2
Errata Revision: 3
TPM Vendor ID: ATML
TPM Version: 01010000
Manufacturer Info: 41544d4c
```
The root cause of the issue is due to the TPM calls to msleep()
were replaced with usleep_range() [1], which reduces
the actual timeout. Via experiments, it is observed that
the original msleep(5) actually sleeps for 15ms.
Because of a known timeout issue in Atmel TPM 1.2 chip,
the shorter timeout than 15ms can cause the error described above.
A few further changes in kernel 4.16 [2] and 4.18 [3, 4] further
reduced the timeout to less than 1ms. With experiments,
the problematic timeout in the latest kernel is the one
for `wait_for_tpm_stat`.
To fix it, the patch reverts the timeout of `wait_for_tpm_stat`
to 15ms for all Atmel TPM 1.2 chips, but leave it untouched
for Ateml TPM 2.0 chip, and chips from other vendors.
As explained above, the chosen 15ms timeout is
the actual timeout before this issue introduced,
thus the old value is used here.
Particularly, TPM_ATML_TIMEOUT_WAIT_STAT_MIN is set to 14700us,
TPM_ATML_TIMEOUT_WAIT_STAT_MIN is set to 15000us according to
the existing TPM_TIMEOUT_RANGE_US (300us).
The fixed has been tested in the system with the affected Atmel chip
with no issues observed after boot up.
References:
[1] 9f3fc7bcddcb tpm: replace msleep() with usleep_range() in TPM
1.2/2.0 generic drivers
[2] cf151a9a44d5 tpm: reduce tpm polling delay in tpm_tis_core
[3] 59f5a6b07f64 tpm: reduce poll sleep time in tpm_transmit()
[4] 424eaf910c32 tpm: reduce polling time to usecs for even finer
granularity
Fixes: 9f3fc7bcddcb ("tpm: replace msleep() with usleep_range() in TPM 1.2/2.0 generic drivers")
Link: https://patchwork.kernel.org/project/linux-integrity/patch/20200926223150.109645-1-hao.wu@rubrik.com/
Signed-off-by: Hao Wu <hao.wu@rubrik.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-09-08 09:26:06 +00:00
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#define TPM_VID_ATML 0x1114
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2019-10-16 05:14:52 +00:00
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enum tpm_chip_flags {
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TPM_CHIP_FLAG_TPM2 = BIT(1),
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TPM_CHIP_FLAG_IRQ = BIT(2),
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TPM_CHIP_FLAG_VIRTUAL = BIT(3),
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TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
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TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
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TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED = BIT(6),
|
|
|
|
};
|
|
|
|
|
|
|
|
#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
|
|
|
|
|
|
|
|
struct tpm_header {
|
|
|
|
__be16 tag;
|
|
|
|
__be32 length;
|
|
|
|
union {
|
|
|
|
__be32 ordinal;
|
|
|
|
__be32 return_code;
|
|
|
|
};
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/* A string buffer type for constructing TPM commands. This is based on the
|
|
|
|
* ideas of string buffer code in security/keys/trusted.h but is heap based
|
|
|
|
* in order to keep the stack usage minimal.
|
|
|
|
*/
|
|
|
|
|
|
|
|
enum tpm_buf_flags {
|
|
|
|
TPM_BUF_OVERFLOW = BIT(0),
|
|
|
|
};
|
|
|
|
|
|
|
|
struct tpm_buf {
|
|
|
|
unsigned int flags;
|
|
|
|
u8 *data;
|
|
|
|
};
|
|
|
|
|
2019-10-16 05:14:55 +00:00
|
|
|
enum tpm2_object_attributes {
|
|
|
|
TPM2_OA_USER_WITH_AUTH = BIT(6),
|
|
|
|
};
|
|
|
|
|
|
|
|
enum tpm2_session_attributes {
|
|
|
|
TPM2_SA_CONTINUE_SESSION = BIT(0),
|
|
|
|
};
|
|
|
|
|
|
|
|
struct tpm2_hash {
|
|
|
|
unsigned int crypto_id;
|
|
|
|
unsigned int tpm_id;
|
|
|
|
};
|
|
|
|
|
2019-10-16 05:14:52 +00:00
|
|
|
static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
|
|
|
|
{
|
|
|
|
struct tpm_header *head = (struct tpm_header *)buf->data;
|
|
|
|
|
|
|
|
head->tag = cpu_to_be16(tag);
|
|
|
|
head->length = cpu_to_be32(sizeof(*head));
|
|
|
|
head->ordinal = cpu_to_be32(ordinal);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
|
|
|
|
{
|
|
|
|
buf->data = (u8 *)__get_free_page(GFP_KERNEL);
|
|
|
|
if (!buf->data)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
buf->flags = 0;
|
|
|
|
tpm_buf_reset(buf, tag, ordinal);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void tpm_buf_destroy(struct tpm_buf *buf)
|
|
|
|
{
|
|
|
|
free_page((unsigned long)buf->data);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline u32 tpm_buf_length(struct tpm_buf *buf)
|
|
|
|
{
|
|
|
|
struct tpm_header *head = (struct tpm_header *)buf->data;
|
|
|
|
|
|
|
|
return be32_to_cpu(head->length);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline u16 tpm_buf_tag(struct tpm_buf *buf)
|
|
|
|
{
|
|
|
|
struct tpm_header *head = (struct tpm_header *)buf->data;
|
|
|
|
|
|
|
|
return be16_to_cpu(head->tag);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void tpm_buf_append(struct tpm_buf *buf,
|
|
|
|
const unsigned char *new_data,
|
|
|
|
unsigned int new_len)
|
|
|
|
{
|
|
|
|
struct tpm_header *head = (struct tpm_header *)buf->data;
|
|
|
|
u32 len = tpm_buf_length(buf);
|
|
|
|
|
|
|
|
/* Return silently if overflow has already happened. */
|
|
|
|
if (buf->flags & TPM_BUF_OVERFLOW)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if ((len + new_len) > PAGE_SIZE) {
|
|
|
|
WARN(1, "tpm_buf: overflow\n");
|
|
|
|
buf->flags |= TPM_BUF_OVERFLOW;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(&buf->data[len], new_data, new_len);
|
|
|
|
head->length = cpu_to_be32(len + new_len);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
|
|
|
|
{
|
|
|
|
tpm_buf_append(buf, &value, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
|
|
|
|
{
|
|
|
|
__be16 value2 = cpu_to_be16(value);
|
|
|
|
|
|
|
|
tpm_buf_append(buf, (u8 *) &value2, 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
|
|
|
|
{
|
|
|
|
__be32 value2 = cpu_to_be32(value);
|
|
|
|
|
|
|
|
tpm_buf_append(buf, (u8 *) &value2, 4);
|
|
|
|
}
|
|
|
|
|
2019-10-16 05:14:55 +00:00
|
|
|
static inline u32 tpm2_rc_value(u32 rc)
|
|
|
|
{
|
|
|
|
return (rc & BIT(7)) ? rc & 0xff : rc;
|
|
|
|
}
|
|
|
|
|
2009-10-28 19:26:39 +00:00
|
|
|
#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
|
2009-02-02 17:23:44 +00:00
|
|
|
|
2017-11-05 11:16:26 +00:00
|
|
|
extern int tpm_is_tpm2(struct tpm_chip *chip);
|
2021-01-28 23:56:21 +00:00
|
|
|
extern __must_check int tpm_try_get_ops(struct tpm_chip *chip);
|
|
|
|
extern void tpm_put_ops(struct tpm_chip *chip);
|
|
|
|
extern ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
|
|
|
|
size_t min_rsp_body_length, const char *desc);
|
tpm: retrieve digest size of unknown algorithms with PCR read
Currently, the TPM driver retrieves the digest size from a table mapping
TPM algorithms identifiers to identifiers defined by the crypto subsystem.
If the algorithm is not defined by the latter, the digest size can be
retrieved from the output of the PCR read command.
The patch modifies the definition of tpm_pcr_read() and tpm2_pcr_read() to
pass the desired hash algorithm and obtain the digest size at TPM startup.
Algorithms and corresponding digest sizes are stored in the new structure
tpm_bank_info, member of tpm_chip, so that the information can be used by
other kernel subsystems.
tpm_bank_info contains: the TPM algorithm identifier, necessary to generate
the event log as defined by Trusted Computing Group (TCG); the digest size,
to pad/truncate a digest calculated with a different algorithm; the crypto
subsystem identifier, to calculate the digest of event data.
This patch also protects against data corruption that could happen in the
bus, by checking that the digest size returned by the TPM during a PCR read
matches the size of the algorithm passed to tpm2_pcr_read().
For the initial PCR read, when digest sizes are not yet available, this
patch ensures that the amount of data copied from the output returned by
the TPM does not exceed the size of the array data are copied to.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
2019-02-06 16:24:49 +00:00
|
|
|
extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
|
|
|
|
struct tpm_digest *digest);
|
2019-02-06 16:24:52 +00:00
|
|
|
extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
|
|
|
|
struct tpm_digest *digests);
|
2017-11-05 11:16:26 +00:00
|
|
|
extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
|
|
|
|
extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
|
2018-06-26 19:09:30 +00:00
|
|
|
extern struct tpm_chip *tpm_default_chip(void);
|
2019-12-12 17:58:35 +00:00
|
|
|
void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
|
2009-10-26 13:26:18 +00:00
|
|
|
#else
|
2017-11-05 11:16:26 +00:00
|
|
|
static inline int tpm_is_tpm2(struct tpm_chip *chip)
|
2015-05-30 05:09:04 +00:00
|
|
|
{
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
tpm: retrieve digest size of unknown algorithms with PCR read
Currently, the TPM driver retrieves the digest size from a table mapping
TPM algorithms identifiers to identifiers defined by the crypto subsystem.
If the algorithm is not defined by the latter, the digest size can be
retrieved from the output of the PCR read command.
The patch modifies the definition of tpm_pcr_read() and tpm2_pcr_read() to
pass the desired hash algorithm and obtain the digest size at TPM startup.
Algorithms and corresponding digest sizes are stored in the new structure
tpm_bank_info, member of tpm_chip, so that the information can be used by
other kernel subsystems.
tpm_bank_info contains: the TPM algorithm identifier, necessary to generate
the event log as defined by Trusted Computing Group (TCG); the digest size,
to pad/truncate a digest calculated with a different algorithm; the crypto
subsystem identifier, to calculate the digest of event data.
This patch also protects against data corruption that could happen in the
bus, by checking that the digest size returned by the TPM during a PCR read
matches the size of the algorithm passed to tpm2_pcr_read().
For the initial PCR read, when digest sizes are not yet available, this
patch ensures that the amount of data copied from the output returned by
the TPM does not exceed the size of the array data are copied to.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
2019-02-06 16:24:49 +00:00
|
|
|
static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx,
|
|
|
|
struct tpm_digest *digest)
|
2017-11-05 11:16:26 +00:00
|
|
|
{
|
2009-10-26 13:26:18 +00:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
2018-10-19 18:23:07 +00:00
|
|
|
|
|
|
|
static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
|
2019-02-06 16:24:52 +00:00
|
|
|
struct tpm_digest *digests)
|
2017-11-05 11:16:26 +00:00
|
|
|
{
|
2009-10-26 13:26:18 +00:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
2018-10-19 18:23:07 +00:00
|
|
|
|
2017-11-05 11:16:26 +00:00
|
|
|
static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
|
|
|
|
{
|
2010-11-23 23:54:16 +00:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
2017-11-05 11:16:26 +00:00
|
|
|
static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
|
|
|
|
{
|
2012-06-07 18:47:14 +00:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
2015-05-30 05:09:04 +00:00
|
|
|
|
2018-06-26 19:09:30 +00:00
|
|
|
static inline struct tpm_chip *tpm_default_chip(void)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
2009-02-02 17:23:44 +00:00
|
|
|
#endif
|
|
|
|
#endif
|