814 lines
19 KiB
C
814 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2004 IBM Corporation
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* Copyright (C) 2014 Intel 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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*
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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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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/freezer.h>
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#include <linux/tpm_eventlog.h>
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#include "tpm.h"
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#define TPM_MAX_ORDINAL 243
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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 ordinal
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* designation of short, medium or long is defined in a table in
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* TCG Specification TPM Main Part 2 TPM Structures Section 17. The
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* values of the SHORT, MEDIUM, and LONG durations are retrieved
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* from the chip during initialization with a call to tpm_get_timeouts.
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*/
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static const u8 tpm1_ordinal_duration[TPM_MAX_ORDINAL] = {
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TPM_UNDEFINED, /* 0 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 5 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 10 */
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_LONG,
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TPM_LONG,
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TPM_MEDIUM, /* 15 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_LONG,
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TPM_SHORT, /* 20 */
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_SHORT, /* 25 */
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_MEDIUM, /* 30 */
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TPM_LONG,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT, /* 35 */
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_MEDIUM, /* 40 */
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TPM_LONG,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT, /* 45 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_LONG,
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TPM_MEDIUM, /* 50 */
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 55 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_MEDIUM, /* 60 */
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_MEDIUM, /* 65 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 70 */
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 75 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_LONG, /* 80 */
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TPM_UNDEFINED,
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TPM_MEDIUM,
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TPM_LONG,
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TPM_SHORT,
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TPM_UNDEFINED, /* 85 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 90 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED, /* 95 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_MEDIUM, /* 100 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 105 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 110 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT, /* 115 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_LONG, /* 120 */
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TPM_LONG,
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_SHORT,
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TPM_SHORT, /* 125 */
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TPM_SHORT,
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TPM_LONG,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT, /* 130 */
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_UNDEFINED, /* 135 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 140 */
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 145 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 150 */
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED, /* 155 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 160 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 165 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_LONG, /* 170 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 175 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_MEDIUM, /* 180 */
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_MEDIUM, /* 185 */
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 190 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 195 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 200 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT,
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TPM_SHORT, /* 205 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_MEDIUM, /* 210 */
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TPM_UNDEFINED,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_UNDEFINED, /* 215 */
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT,
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TPM_SHORT, /* 220 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED, /* 225 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 230 */
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TPM_LONG,
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 235 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 240 */
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TPM_UNDEFINED,
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TPM_MEDIUM,
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};
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/**
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* tpm1_calc_ordinal_duration() - calculate the maximum command duration
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* @chip: TPM chip to use.
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* @ordinal: TPM command ordinal.
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*
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* The function returns the maximum amount of time the chip could take
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* to return the result for a particular ordinal in jiffies.
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*
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* Return: A maximal duration time for an ordinal in jiffies.
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*/
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unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
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{
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int duration_idx = TPM_UNDEFINED;
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int duration = 0;
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/*
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* We only have a duration table for protected commands, where the upper
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* 16 bits are 0. For the few other ordinals the fallback will be used.
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*/
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if (ordinal < TPM_MAX_ORDINAL)
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duration_idx = tpm1_ordinal_duration[ordinal];
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if (duration_idx != TPM_UNDEFINED)
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duration = chip->duration[duration_idx];
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if (duration <= 0)
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return 2 * 60 * HZ;
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else
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return duration;
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}
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#define TPM_ORD_STARTUP 153
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#define TPM_ST_CLEAR 1
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/**
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* tpm1_startup() - turn on the TPM
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* @chip: TPM chip to use
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*
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* Normally the firmware should start the TPM. This function is provided as a
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* workaround if this does not happen. A legal case for this could be for
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* example when a TPM emulator is used.
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*
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* Return: same as tpm_transmit_cmd()
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*/
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static int tpm1_startup(struct tpm_chip *chip)
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{
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struct tpm_buf buf;
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int rc;
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dev_info(&chip->dev, "starting up the TPM manually\n");
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_STARTUP);
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if (rc < 0)
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return rc;
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tpm_buf_append_u16(&buf, TPM_ST_CLEAR);
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rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to start the TPM");
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tpm_buf_destroy(&buf);
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return rc;
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}
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int tpm1_get_timeouts(struct tpm_chip *chip)
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{
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cap_t cap;
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unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
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unsigned long durations[3];
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ssize_t rc;
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rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
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sizeof(cap.timeout));
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if (rc == TPM_ERR_INVALID_POSTINIT) {
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if (tpm1_startup(chip))
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return rc;
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rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
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"attempting to determine the timeouts",
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sizeof(cap.timeout));
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}
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if (rc) {
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dev_err(&chip->dev, "A TPM error (%zd) occurred attempting to determine the timeouts\n",
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rc);
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return rc;
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}
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timeout_old[0] = jiffies_to_usecs(chip->timeout_a);
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timeout_old[1] = jiffies_to_usecs(chip->timeout_b);
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timeout_old[2] = jiffies_to_usecs(chip->timeout_c);
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timeout_old[3] = jiffies_to_usecs(chip->timeout_d);
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timeout_chip[0] = be32_to_cpu(cap.timeout.a);
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timeout_chip[1] = be32_to_cpu(cap.timeout.b);
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timeout_chip[2] = be32_to_cpu(cap.timeout.c);
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timeout_chip[3] = be32_to_cpu(cap.timeout.d);
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memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff));
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/*
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* Provide ability for vendor overrides of timeout values in case
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* of misreporting.
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*/
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if (chip->ops->update_timeouts)
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chip->ops->update_timeouts(chip, timeout_eff);
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if (!chip->timeout_adjusted) {
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/* Restore default if chip reported 0 */
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) {
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if (timeout_eff[i])
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continue;
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timeout_eff[i] = timeout_old[i];
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chip->timeout_adjusted = true;
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}
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if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) {
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/* timeouts in msec rather usec */
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for (i = 0; i != ARRAY_SIZE(timeout_eff); i++)
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timeout_eff[i] *= 1000;
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chip->timeout_adjusted = true;
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}
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}
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/* Report adjusted timeouts */
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if (chip->timeout_adjusted) {
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dev_info(&chip->dev, HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
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timeout_chip[0], timeout_eff[0],
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timeout_chip[1], timeout_eff[1],
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timeout_chip[2], timeout_eff[2],
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timeout_chip[3], timeout_eff[3]);
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}
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chip->timeout_a = usecs_to_jiffies(timeout_eff[0]);
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chip->timeout_b = usecs_to_jiffies(timeout_eff[1]);
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chip->timeout_c = usecs_to_jiffies(timeout_eff[2]);
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chip->timeout_d = usecs_to_jiffies(timeout_eff[3]);
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rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,
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"attempting to determine the durations",
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sizeof(cap.duration));
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if (rc)
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return rc;
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chip->duration[TPM_SHORT] =
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usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short));
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chip->duration[TPM_MEDIUM] =
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usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));
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chip->duration[TPM_LONG] =
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usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
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chip->duration[TPM_LONG_LONG] = 0; /* not used under 1.2 */
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/*
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* Provide the ability for vendor overrides of duration values in case
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* of misreporting.
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*/
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if (chip->ops->update_durations)
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chip->ops->update_durations(chip, durations);
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if (chip->duration_adjusted) {
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dev_info(&chip->dev, HW_ERR "Adjusting reported durations.");
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chip->duration[TPM_SHORT] = durations[0];
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chip->duration[TPM_MEDIUM] = durations[1];
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chip->duration[TPM_LONG] = durations[2];
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}
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/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
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* value wrong and apparently reports msecs rather than usecs. So we
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* fix up the resulting too-small TPM_SHORT value to make things work.
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* We also scale the TPM_MEDIUM and -_LONG values by 1000.
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*/
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if (chip->duration[TPM_SHORT] < (HZ / 100)) {
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chip->duration[TPM_SHORT] = HZ;
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chip->duration[TPM_MEDIUM] *= 1000;
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chip->duration[TPM_LONG] *= 1000;
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chip->duration_adjusted = true;
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dev_info(&chip->dev, "Adjusting TPM timeout parameters.");
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}
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chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
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return 0;
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}
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#define TPM_ORD_PCR_EXTEND 20
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int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash,
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const char *log_msg)
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{
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struct tpm_buf buf;
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int rc;
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCR_EXTEND);
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if (rc)
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return rc;
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tpm_buf_append_u32(&buf, pcr_idx);
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tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE);
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rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE, log_msg);
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tpm_buf_destroy(&buf);
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return rc;
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}
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#define TPM_ORD_GET_CAP 101
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ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
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const char *desc, size_t min_cap_length)
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{
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struct tpm_buf buf;
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int rc;
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
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if (rc)
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return rc;
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if (subcap_id == TPM_CAP_VERSION_1_1 ||
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subcap_id == TPM_CAP_VERSION_1_2) {
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tpm_buf_append_u32(&buf, subcap_id);
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tpm_buf_append_u32(&buf, 0);
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} else {
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if (subcap_id == TPM_CAP_FLAG_PERM ||
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subcap_id == TPM_CAP_FLAG_VOL)
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tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
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else
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tpm_buf_append_u32(&buf, TPM_CAP_PROP);
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tpm_buf_append_u32(&buf, 4);
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tpm_buf_append_u32(&buf, subcap_id);
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}
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rc = tpm_transmit_cmd(chip, &buf, min_cap_length, desc);
|
|
if (!rc)
|
|
*cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
|
|
tpm_buf_destroy(&buf);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm1_getcap);
|
|
|
|
#define TPM_ORD_GET_RANDOM 70
|
|
struct tpm1_get_random_out {
|
|
__be32 rng_data_len;
|
|
u8 rng_data[TPM_MAX_RNG_DATA];
|
|
} __packed;
|
|
|
|
/**
|
|
* tpm1_get_random() - get random bytes from the TPM's RNG
|
|
* @chip: a &struct tpm_chip instance
|
|
* @dest: destination buffer for the random bytes
|
|
* @max: the maximum number of bytes to write to @dest
|
|
*
|
|
* Return:
|
|
* * number of bytes read
|
|
* * -errno (positive TPM return codes are masked to -EIO)
|
|
*/
|
|
int tpm1_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
|
|
{
|
|
struct tpm1_get_random_out *out;
|
|
u32 num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
|
|
struct tpm_buf buf;
|
|
u32 total = 0;
|
|
int retries = 5;
|
|
u32 recd;
|
|
int rc;
|
|
|
|
rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_RANDOM);
|
|
if (rc)
|
|
return rc;
|
|
|
|
do {
|
|
tpm_buf_append_u32(&buf, num_bytes);
|
|
|
|
rc = tpm_transmit_cmd(chip, &buf, sizeof(out->rng_data_len),
|
|
"attempting get random");
|
|
if (rc) {
|
|
if (rc > 0)
|
|
rc = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
out = (struct tpm1_get_random_out *)&buf.data[TPM_HEADER_SIZE];
|
|
|
|
recd = be32_to_cpu(out->rng_data_len);
|
|
if (recd > num_bytes) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
if (tpm_buf_length(&buf) < TPM_HEADER_SIZE +
|
|
sizeof(out->rng_data_len) + recd) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
memcpy(dest, out->rng_data, recd);
|
|
|
|
dest += recd;
|
|
total += recd;
|
|
num_bytes -= recd;
|
|
|
|
tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_RANDOM);
|
|
} while (retries-- && total < max);
|
|
|
|
rc = total ? (int)total : -EIO;
|
|
out:
|
|
tpm_buf_destroy(&buf);
|
|
return rc;
|
|
}
|
|
|
|
#define TPM_ORD_PCRREAD 21
|
|
int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
|
|
{
|
|
struct tpm_buf buf;
|
|
int rc;
|
|
|
|
rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCRREAD);
|
|
if (rc)
|
|
return rc;
|
|
|
|
tpm_buf_append_u32(&buf, pcr_idx);
|
|
|
|
rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE,
|
|
"attempting to read a pcr value");
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (tpm_buf_length(&buf) < TPM_DIGEST_SIZE) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
memcpy(res_buf, &buf.data[TPM_HEADER_SIZE], TPM_DIGEST_SIZE);
|
|
|
|
out:
|
|
tpm_buf_destroy(&buf);
|
|
return rc;
|
|
}
|
|
|
|
#define TPM_ORD_CONTINUE_SELFTEST 83
|
|
/**
|
|
* tpm1_continue_selftest() - run TPM's selftest
|
|
* @chip: TPM chip to use
|
|
*
|
|
* Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
|
|
* a TPM error code.
|
|
*/
|
|
static int tpm1_continue_selftest(struct tpm_chip *chip)
|
|
{
|
|
struct tpm_buf buf;
|
|
int rc;
|
|
|
|
rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_CONTINUE_SELFTEST);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = tpm_transmit_cmd(chip, &buf, 0, "continue selftest");
|
|
tpm_buf_destroy(&buf);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* tpm1_do_selftest - have the TPM continue its selftest and wait until it
|
|
* can receive further commands
|
|
* @chip: TPM chip to use
|
|
*
|
|
* Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
|
|
* a TPM error code.
|
|
*/
|
|
int tpm1_do_selftest(struct tpm_chip *chip)
|
|
{
|
|
int rc;
|
|
unsigned int loops;
|
|
unsigned int delay_msec = 100;
|
|
unsigned long duration;
|
|
u8 dummy[TPM_DIGEST_SIZE];
|
|
|
|
duration = tpm1_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
|
|
|
|
loops = jiffies_to_msecs(duration) / delay_msec;
|
|
|
|
rc = tpm1_continue_selftest(chip);
|
|
if (rc == TPM_ERR_INVALID_POSTINIT) {
|
|
chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
|
|
dev_info(&chip->dev, "TPM not ready (%d)\n", rc);
|
|
}
|
|
/* This may fail if there was no TPM driver during a suspend/resume
|
|
* cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
|
|
*/
|
|
if (rc)
|
|
return rc;
|
|
|
|
do {
|
|
/* Attempt to read a PCR value */
|
|
rc = tpm1_pcr_read(chip, 0, dummy);
|
|
|
|
/* Some buggy TPMs will not respond to tpm_tis_ready() for
|
|
* around 300ms while the self test is ongoing, keep trying
|
|
* until the self test duration expires.
|
|
*/
|
|
if (rc == -ETIME) {
|
|
dev_info(&chip->dev, HW_ERR "TPM command timed out during continue self test");
|
|
tpm_msleep(delay_msec);
|
|
continue;
|
|
}
|
|
|
|
if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
|
|
dev_info(&chip->dev, "TPM is disabled/deactivated (0x%X)\n",
|
|
rc);
|
|
/* TPM is disabled and/or deactivated; driver can
|
|
* proceed and TPM does handle commands for
|
|
* suspend/resume correctly
|
|
*/
|
|
return 0;
|
|
}
|
|
if (rc != TPM_WARN_DOING_SELFTEST)
|
|
return rc;
|
|
tpm_msleep(delay_msec);
|
|
} while (--loops > 0);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm1_do_selftest);
|
|
|
|
/**
|
|
* tpm1_auto_startup - Perform the standard automatic TPM initialization
|
|
* sequence
|
|
* @chip: TPM chip to use
|
|
*
|
|
* Returns 0 on success, < 0 in case of fatal error.
|
|
*/
|
|
int tpm1_auto_startup(struct tpm_chip *chip)
|
|
{
|
|
int rc;
|
|
|
|
rc = tpm1_get_timeouts(chip);
|
|
if (rc)
|
|
goto out;
|
|
rc = tpm1_do_selftest(chip);
|
|
if (rc == TPM_ERR_FAILEDSELFTEST) {
|
|
dev_warn(&chip->dev, "TPM self test failed, switching to the firmware upgrade mode\n");
|
|
/* A TPM in this state possibly allows or needs a firmware upgrade */
|
|
chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE;
|
|
return 0;
|
|
} else if (rc) {
|
|
dev_err(&chip->dev, "TPM self test failed\n");
|
|
goto out;
|
|
}
|
|
|
|
return rc;
|
|
out:
|
|
if (rc > 0)
|
|
rc = -ENODEV;
|
|
return rc;
|
|
}
|
|
|
|
#define TPM_ORD_SAVESTATE 152
|
|
|
|
/**
|
|
* tpm1_pm_suspend() - pm suspend handler
|
|
* @chip: TPM chip to use.
|
|
* @tpm_suspend_pcr: flush pcr for buggy TPM chips.
|
|
*
|
|
* The functions saves the TPM state to be restored on resume.
|
|
*
|
|
* Return:
|
|
* * 0 on success,
|
|
* * < 0 on error.
|
|
*/
|
|
int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr)
|
|
{
|
|
u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
|
|
struct tpm_buf buf;
|
|
unsigned int try;
|
|
int rc;
|
|
|
|
|
|
/* for buggy tpm, flush pcrs with extend to selected dummy */
|
|
if (tpm_suspend_pcr)
|
|
rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash,
|
|
"extending dummy pcr before suspend");
|
|
|
|
rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE);
|
|
if (rc)
|
|
return rc;
|
|
/* now do the actual savestate */
|
|
for (try = 0; try < TPM_RETRY; try++) {
|
|
rc = tpm_transmit_cmd(chip, &buf, 0, NULL);
|
|
/*
|
|
* If the TPM indicates that it is too busy to respond to
|
|
* this command then retry before giving up. It can take
|
|
* several seconds for this TPM to be ready.
|
|
*
|
|
* This can happen if the TPM has already been sent the
|
|
* SaveState command before the driver has loaded. TCG 1.2
|
|
* specification states that any communication after SaveState
|
|
* may cause the TPM to invalidate previously saved state.
|
|
*/
|
|
if (rc != TPM_WARN_RETRY)
|
|
break;
|
|
tpm_msleep(TPM_TIMEOUT_RETRY);
|
|
|
|
tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE);
|
|
}
|
|
|
|
if (rc)
|
|
dev_err(&chip->dev, "Error (%d) sending savestate before suspend\n",
|
|
rc);
|
|
else if (try > 0)
|
|
dev_warn(&chip->dev, "TPM savestate took %dms\n",
|
|
try * TPM_TIMEOUT_RETRY);
|
|
|
|
tpm_buf_destroy(&buf);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* tpm1_get_pcr_allocation() - initialize the allocated bank
|
|
* @chip: TPM chip to use.
|
|
*
|
|
* The function initializes the SHA1 allocated bank to extend PCR
|
|
*
|
|
* Return:
|
|
* * 0 on success,
|
|
* * < 0 on error.
|
|
*/
|
|
int tpm1_get_pcr_allocation(struct tpm_chip *chip)
|
|
{
|
|
chip->allocated_banks = kcalloc(1, sizeof(*chip->allocated_banks),
|
|
GFP_KERNEL);
|
|
if (!chip->allocated_banks)
|
|
return -ENOMEM;
|
|
|
|
chip->allocated_banks[0].alg_id = TPM_ALG_SHA1;
|
|
chip->allocated_banks[0].digest_size = hash_digest_size[HASH_ALGO_SHA1];
|
|
chip->allocated_banks[0].crypto_id = HASH_ALGO_SHA1;
|
|
chip->nr_allocated_banks = 1;
|
|
|
|
return 0;
|
|
}
|