mirror of https://gitee.com/openkylin/linux.git
1153 lines
28 KiB
C
1153 lines
28 KiB
C
/*
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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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* 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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* 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 as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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* Note, the TPM chip is not interrupt driven (only polling)
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* and can have very long timeouts (minutes!). Hence the unusual
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* calls to msleep.
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*
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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 "tpm.h"
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#include "tpm_eventlog.h"
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#define TPM_MAX_ORDINAL 243
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#define TSC_MAX_ORDINAL 12
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#define TPM_PROTECTED_COMMAND 0x00
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#define TPM_CONNECTION_COMMAND 0x40
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/*
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* Bug workaround - some TPM's don't flush the most
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* recently changed pcr on suspend, so force the flush
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* with an extend to the selected _unused_ non-volatile pcr.
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*/
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static int tpm_suspend_pcr;
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module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
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MODULE_PARM_DESC(suspend_pcr,
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"PCR to use for dummy writes to faciltate flush on suspend.");
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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 tpm_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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* Returns max number of jiffies to wait
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*/
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unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
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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 = tpm_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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EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
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/*
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* Internal kernel interface to transmit TPM commands
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*/
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ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
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size_t bufsiz)
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{
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ssize_t rc;
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u32 count, ordinal;
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unsigned long stop;
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if (bufsiz > TPM_BUFSIZE)
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bufsiz = TPM_BUFSIZE;
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count = be32_to_cpu(*((__be32 *) (buf + 2)));
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ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
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if (count == 0)
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return -ENODATA;
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if (count > bufsiz) {
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dev_err(&chip->dev,
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"invalid count value %x %zx\n", count, bufsiz);
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return -E2BIG;
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}
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mutex_lock(&chip->tpm_mutex);
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rc = chip->ops->send(chip, (u8 *) buf, count);
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if (rc < 0) {
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dev_err(&chip->dev,
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"tpm_transmit: tpm_send: error %zd\n", rc);
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goto out;
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}
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if (chip->flags & TPM_CHIP_FLAG_IRQ)
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goto out_recv;
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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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chip->ops->req_complete_val)
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goto out_recv;
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if (chip->ops->req_canceled(chip, status)) {
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dev_err(&chip->dev, "Operation Canceled\n");
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rc = -ECANCELED;
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goto out;
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}
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msleep(TPM_TIMEOUT); /* CHECK */
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rmb();
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} while (time_before(jiffies, stop));
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chip->ops->cancel(chip);
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dev_err(&chip->dev, "Operation Timed out\n");
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rc = -ETIME;
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goto out;
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out_recv:
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rc = chip->ops->recv(chip, (u8 *) buf, bufsiz);
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if (rc < 0)
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dev_err(&chip->dev,
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"tpm_transmit: tpm_recv: error %zd\n", rc);
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out:
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mutex_unlock(&chip->tpm_mutex);
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return rc;
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}
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#define TPM_DIGEST_SIZE 20
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#define TPM_RET_CODE_IDX 6
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ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd,
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int len, const char *desc)
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{
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struct tpm_output_header *header;
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int err;
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len = tpm_transmit(chip, (u8 *) cmd, len);
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if (len < 0)
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return len;
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else if (len < TPM_HEADER_SIZE)
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return -EFAULT;
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header = cmd;
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err = be32_to_cpu(header->return_code);
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if (err != 0 && desc)
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dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err,
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desc);
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return err;
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}
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#define TPM_INTERNAL_RESULT_SIZE 200
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#define TPM_ORD_GET_CAP cpu_to_be32(101)
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#define TPM_ORD_GET_RANDOM cpu_to_be32(70)
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static const struct tpm_input_header tpm_getcap_header = {
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.tag = TPM_TAG_RQU_COMMAND,
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.length = cpu_to_be32(22),
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.ordinal = TPM_ORD_GET_CAP
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};
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ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
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const char *desc)
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{
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struct tpm_cmd_t tpm_cmd;
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int rc;
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tpm_cmd.header.in = tpm_getcap_header;
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if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
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tpm_cmd.params.getcap_in.cap = subcap_id;
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/*subcap field not necessary */
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tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
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tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
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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_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
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else
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tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
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tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
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tpm_cmd.params.getcap_in.subcap = subcap_id;
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}
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rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
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if (!rc)
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*cap = tpm_cmd.params.getcap_out.cap;
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return rc;
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}
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void tpm_gen_interrupt(struct tpm_chip *chip)
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{
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struct tpm_cmd_t tpm_cmd;
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ssize_t rc;
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tpm_cmd.header.in = tpm_getcap_header;
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tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
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tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
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tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
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rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
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"attempting to determine the timeouts");
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}
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EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
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#define TPM_ORD_STARTUP cpu_to_be32(153)
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#define TPM_ST_CLEAR cpu_to_be16(1)
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#define TPM_ST_STATE cpu_to_be16(2)
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#define TPM_ST_DEACTIVATED cpu_to_be16(3)
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static const struct tpm_input_header tpm_startup_header = {
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.tag = TPM_TAG_RQU_COMMAND,
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.length = cpu_to_be32(12),
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.ordinal = TPM_ORD_STARTUP
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};
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|
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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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}
|
|
|
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int tpm_get_timeouts(struct tpm_chip *chip)
|
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{
|
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struct tpm_cmd_t tpm_cmd;
|
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unsigned long new_timeout[4];
|
|
unsigned long old_timeout[4];
|
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struct duration_t *duration_cap;
|
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ssize_t rc;
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|
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if (chip->flags & TPM_CHIP_FLAG_TPM2) {
|
|
/* Fixed timeouts for TPM2 */
|
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chip->timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
|
|
chip->timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
|
|
chip->timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
|
|
chip->timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
|
|
chip->duration[TPM_SHORT] =
|
|
msecs_to_jiffies(TPM2_DURATION_SHORT);
|
|
chip->duration[TPM_MEDIUM] =
|
|
msecs_to_jiffies(TPM2_DURATION_MEDIUM);
|
|
chip->duration[TPM_LONG] =
|
|
msecs_to_jiffies(TPM2_DURATION_LONG);
|
|
return 0;
|
|
}
|
|
|
|
tpm_cmd.header.in = tpm_getcap_header;
|
|
tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
|
|
tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
|
|
tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
|
|
rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
|
|
|
|
if (rc == TPM_ERR_INVALID_POSTINIT) {
|
|
/* The TPM is not started, we are the first to talk to it.
|
|
Execute a startup command. */
|
|
dev_info(&chip->dev, "Issuing TPM_STARTUP");
|
|
if (tpm_startup(chip, TPM_ST_CLEAR))
|
|
return rc;
|
|
|
|
tpm_cmd.header.in = tpm_getcap_header;
|
|
tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
|
|
tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
|
|
tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
|
|
rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
|
|
NULL);
|
|
}
|
|
if (rc) {
|
|
dev_err(&chip->dev,
|
|
"A TPM error (%zd) occurred attempting to determine the timeouts\n",
|
|
rc);
|
|
goto duration;
|
|
}
|
|
|
|
if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
|
|
be32_to_cpu(tpm_cmd.header.out.length)
|
|
!= sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
|
|
return -EINVAL;
|
|
|
|
old_timeout[0] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.a);
|
|
old_timeout[1] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.b);
|
|
old_timeout[2] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.c);
|
|
old_timeout[3] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.d);
|
|
memcpy(new_timeout, old_timeout, sizeof(new_timeout));
|
|
|
|
/*
|
|
* Provide ability for vendor overrides of timeout values in case
|
|
* of misreporting.
|
|
*/
|
|
if (chip->ops->update_timeouts != NULL)
|
|
chip->timeout_adjusted =
|
|
chip->ops->update_timeouts(chip, new_timeout);
|
|
|
|
if (!chip->timeout_adjusted) {
|
|
/* Don't overwrite default if value is 0 */
|
|
if (new_timeout[0] != 0 && new_timeout[0] < 1000) {
|
|
int i;
|
|
|
|
/* timeouts in msec rather usec */
|
|
for (i = 0; i != ARRAY_SIZE(new_timeout); i++)
|
|
new_timeout[i] *= 1000;
|
|
chip->timeout_adjusted = true;
|
|
}
|
|
}
|
|
|
|
/* Report adjusted timeouts */
|
|
if (chip->timeout_adjusted) {
|
|
dev_info(&chip->dev,
|
|
HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
|
|
old_timeout[0], new_timeout[0],
|
|
old_timeout[1], new_timeout[1],
|
|
old_timeout[2], new_timeout[2],
|
|
old_timeout[3], new_timeout[3]);
|
|
}
|
|
|
|
chip->timeout_a = usecs_to_jiffies(new_timeout[0]);
|
|
chip->timeout_b = usecs_to_jiffies(new_timeout[1]);
|
|
chip->timeout_c = usecs_to_jiffies(new_timeout[2]);
|
|
chip->timeout_d = usecs_to_jiffies(new_timeout[3]);
|
|
|
|
duration:
|
|
tpm_cmd.header.in = tpm_getcap_header;
|
|
tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
|
|
tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
|
|
tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
|
|
|
|
rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
|
|
"attempting to determine the durations");
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
|
|
be32_to_cpu(tpm_cmd.header.out.length)
|
|
!= sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
|
|
return -EINVAL;
|
|
|
|
duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
|
|
chip->duration[TPM_SHORT] =
|
|
usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
|
|
chip->duration[TPM_MEDIUM] =
|
|
usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
|
|
chip->duration[TPM_LONG] =
|
|
usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
|
|
|
|
/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
|
|
* value wrong and apparently reports msecs rather than usecs. So we
|
|
* fix up the resulting too-small TPM_SHORT value to make things work.
|
|
* We also scale the TPM_MEDIUM and -_LONG values by 1000.
|
|
*/
|
|
if (chip->duration[TPM_SHORT] < (HZ / 100)) {
|
|
chip->duration[TPM_SHORT] = HZ;
|
|
chip->duration[TPM_MEDIUM] *= 1000;
|
|
chip->duration[TPM_LONG] *= 1000;
|
|
chip->duration_adjusted = true;
|
|
dev_info(&chip->dev, "Adjusting TPM timeout parameters.");
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_get_timeouts);
|
|
|
|
#define TPM_ORD_CONTINUE_SELFTEST 83
|
|
#define CONTINUE_SELFTEST_RESULT_SIZE 10
|
|
|
|
static struct tpm_input_header continue_selftest_header = {
|
|
.tag = TPM_TAG_RQU_COMMAND,
|
|
.length = cpu_to_be32(10),
|
|
.ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
|
|
};
|
|
|
|
/**
|
|
* tpm_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 tpm_continue_selftest(struct tpm_chip *chip)
|
|
{
|
|
int rc;
|
|
struct tpm_cmd_t cmd;
|
|
|
|
cmd.header.in = continue_selftest_header;
|
|
rc = tpm_transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
|
|
"continue selftest");
|
|
return rc;
|
|
}
|
|
|
|
#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
|
|
#define READ_PCR_RESULT_SIZE 30
|
|
static struct tpm_input_header pcrread_header = {
|
|
.tag = TPM_TAG_RQU_COMMAND,
|
|
.length = cpu_to_be32(14),
|
|
.ordinal = TPM_ORDINAL_PCRREAD
|
|
};
|
|
|
|
int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
|
|
{
|
|
int rc;
|
|
struct tpm_cmd_t cmd;
|
|
|
|
cmd.header.in = pcrread_header;
|
|
cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
|
|
rc = tpm_transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
|
|
"attempting to read a pcr value");
|
|
|
|
if (rc == 0)
|
|
memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
|
|
TPM_DIGEST_SIZE);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* tpm_is_tpm2 - is the chip a TPM2 chip?
|
|
* @chip_num: tpm idx # or ANY
|
|
*
|
|
* Returns < 0 on error, and 1 or 0 on success depending whether the chip
|
|
* is a TPM2 chip.
|
|
*/
|
|
int tpm_is_tpm2(u32 chip_num)
|
|
{
|
|
struct tpm_chip *chip;
|
|
int rc;
|
|
|
|
chip = tpm_chip_find_get(chip_num);
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
|
|
rc = (chip->flags & TPM_CHIP_FLAG_TPM2) != 0;
|
|
|
|
tpm_put_ops(chip);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_is_tpm2);
|
|
|
|
/**
|
|
* tpm_pcr_read - read a pcr value
|
|
* @chip_num: tpm idx # or ANY
|
|
* @pcr_idx: pcr idx to retrieve
|
|
* @res_buf: TPM_PCR value
|
|
* size of res_buf is 20 bytes (or NULL if you don't care)
|
|
*
|
|
* The TPM driver should be built-in, but for whatever reason it
|
|
* isn't, protect against the chip disappearing, by incrementing
|
|
* the module usage count.
|
|
*/
|
|
int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
|
|
{
|
|
struct tpm_chip *chip;
|
|
int rc;
|
|
|
|
chip = tpm_chip_find_get(chip_num);
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
if (chip->flags & TPM_CHIP_FLAG_TPM2)
|
|
rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
|
|
else
|
|
rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
|
|
tpm_put_ops(chip);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_pcr_read);
|
|
|
|
/**
|
|
* tpm_pcr_extend - extend pcr value with hash
|
|
* @chip_num: tpm idx # or AN&
|
|
* @pcr_idx: pcr idx to extend
|
|
* @hash: hash value used to extend pcr value
|
|
*
|
|
* The TPM driver should be built-in, but for whatever reason it
|
|
* isn't, protect against the chip disappearing, by incrementing
|
|
* the module usage count.
|
|
*/
|
|
#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
|
|
#define EXTEND_PCR_RESULT_SIZE 34
|
|
static struct tpm_input_header pcrextend_header = {
|
|
.tag = TPM_TAG_RQU_COMMAND,
|
|
.length = cpu_to_be32(34),
|
|
.ordinal = TPM_ORD_PCR_EXTEND
|
|
};
|
|
|
|
int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
|
|
{
|
|
struct tpm_cmd_t cmd;
|
|
int rc;
|
|
struct tpm_chip *chip;
|
|
|
|
chip = tpm_chip_find_get(chip_num);
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
|
|
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
|
|
rc = tpm2_pcr_extend(chip, pcr_idx, hash);
|
|
tpm_put_ops(chip);
|
|
return rc;
|
|
}
|
|
|
|
cmd.header.in = pcrextend_header;
|
|
cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
|
|
memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
|
|
rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
|
|
"attempting extend a PCR value");
|
|
|
|
tpm_put_ops(chip);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_pcr_extend);
|
|
|
|
/**
|
|
* tpm_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 tpm_do_selftest(struct tpm_chip *chip)
|
|
{
|
|
int rc;
|
|
unsigned int loops;
|
|
unsigned int delay_msec = 100;
|
|
unsigned long duration;
|
|
struct tpm_cmd_t cmd;
|
|
|
|
duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
|
|
|
|
loops = jiffies_to_msecs(duration) / delay_msec;
|
|
|
|
rc = tpm_continue_selftest(chip);
|
|
/* 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 */
|
|
cmd.header.in = pcrread_header;
|
|
cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
|
|
rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
|
|
/* 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");
|
|
msleep(delay_msec);
|
|
continue;
|
|
}
|
|
|
|
if (rc < TPM_HEADER_SIZE)
|
|
return -EFAULT;
|
|
|
|
rc = be32_to_cpu(cmd.header.out.return_code);
|
|
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;
|
|
msleep(delay_msec);
|
|
} while (--loops > 0);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_do_selftest);
|
|
|
|
int tpm_send(u32 chip_num, void *cmd, size_t buflen)
|
|
{
|
|
struct tpm_chip *chip;
|
|
int rc;
|
|
|
|
chip = tpm_chip_find_get(chip_num);
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
|
|
rc = tpm_transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
|
|
|
|
tpm_put_ops(chip);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_send);
|
|
|
|
static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
|
|
bool check_cancel, bool *canceled)
|
|
{
|
|
u8 status = chip->ops->status(chip);
|
|
|
|
*canceled = false;
|
|
if ((status & mask) == mask)
|
|
return true;
|
|
if (check_cancel && chip->ops->req_canceled(chip, status)) {
|
|
*canceled = true;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
|
|
wait_queue_head_t *queue, bool check_cancel)
|
|
{
|
|
unsigned long stop;
|
|
long rc;
|
|
u8 status;
|
|
bool canceled = false;
|
|
|
|
/* check current status */
|
|
status = chip->ops->status(chip);
|
|
if ((status & mask) == mask)
|
|
return 0;
|
|
|
|
stop = jiffies + timeout;
|
|
|
|
if (chip->flags & TPM_CHIP_FLAG_IRQ) {
|
|
again:
|
|
timeout = stop - jiffies;
|
|
if ((long)timeout <= 0)
|
|
return -ETIME;
|
|
rc = wait_event_interruptible_timeout(*queue,
|
|
wait_for_tpm_stat_cond(chip, mask, check_cancel,
|
|
&canceled),
|
|
timeout);
|
|
if (rc > 0) {
|
|
if (canceled)
|
|
return -ECANCELED;
|
|
return 0;
|
|
}
|
|
if (rc == -ERESTARTSYS && freezing(current)) {
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
goto again;
|
|
}
|
|
} else {
|
|
do {
|
|
msleep(TPM_TIMEOUT);
|
|
status = chip->ops->status(chip);
|
|
if ((status & mask) == mask)
|
|
return 0;
|
|
} while (time_before(jiffies, stop));
|
|
}
|
|
return -ETIME;
|
|
}
|
|
EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
|
|
|
|
#define TPM_ORD_SAVESTATE cpu_to_be32(152)
|
|
#define SAVESTATE_RESULT_SIZE 10
|
|
|
|
static struct tpm_input_header savestate_header = {
|
|
.tag = TPM_TAG_RQU_COMMAND,
|
|
.length = cpu_to_be32(10),
|
|
.ordinal = TPM_ORD_SAVESTATE
|
|
};
|
|
|
|
/*
|
|
* We are about to suspend. Save the TPM state
|
|
* so that it can be restored.
|
|
*/
|
|
int tpm_pm_suspend(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
struct tpm_cmd_t cmd;
|
|
int rc, try;
|
|
|
|
u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
|
|
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
|
|
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
|
|
tpm2_shutdown(chip, TPM2_SU_STATE);
|
|
return 0;
|
|
}
|
|
|
|
/* for buggy tpm, flush pcrs with extend to selected dummy */
|
|
if (tpm_suspend_pcr) {
|
|
cmd.header.in = pcrextend_header;
|
|
cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
|
|
memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
|
|
TPM_DIGEST_SIZE);
|
|
rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
|
|
"extending dummy pcr before suspend");
|
|
}
|
|
|
|
/* now do the actual savestate */
|
|
for (try = 0; try < TPM_RETRY; try++) {
|
|
cmd.header.in = savestate_header;
|
|
rc = tpm_transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, 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;
|
|
msleep(TPM_TIMEOUT_RETRY);
|
|
}
|
|
|
|
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);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_pm_suspend);
|
|
|
|
/*
|
|
* Resume from a power safe. The BIOS already restored
|
|
* the TPM state.
|
|
*/
|
|
int tpm_pm_resume(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_pm_resume);
|
|
|
|
#define TPM_GETRANDOM_RESULT_SIZE 18
|
|
static struct tpm_input_header tpm_getrandom_header = {
|
|
.tag = TPM_TAG_RQU_COMMAND,
|
|
.length = cpu_to_be32(14),
|
|
.ordinal = TPM_ORD_GET_RANDOM
|
|
};
|
|
|
|
/**
|
|
* tpm_get_random() - Get random bytes from the tpm's RNG
|
|
* @chip_num: A specific chip number for the request or TPM_ANY_NUM
|
|
* @out: destination buffer for the random bytes
|
|
* @max: the max number of bytes to write to @out
|
|
*
|
|
* Returns < 0 on error and the number of bytes read on success
|
|
*/
|
|
int tpm_get_random(u32 chip_num, u8 *out, size_t max)
|
|
{
|
|
struct tpm_chip *chip;
|
|
struct tpm_cmd_t tpm_cmd;
|
|
u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
|
|
int err, total = 0, retries = 5;
|
|
u8 *dest = out;
|
|
|
|
if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
|
|
return -EINVAL;
|
|
|
|
chip = tpm_chip_find_get(chip_num);
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
|
|
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
|
|
err = tpm2_get_random(chip, out, max);
|
|
tpm_put_ops(chip);
|
|
return err;
|
|
}
|
|
|
|
do {
|
|
tpm_cmd.header.in = tpm_getrandom_header;
|
|
tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
|
|
|
|
err = tpm_transmit_cmd(chip, &tpm_cmd,
|
|
TPM_GETRANDOM_RESULT_SIZE + num_bytes,
|
|
"attempting get random");
|
|
if (err)
|
|
break;
|
|
|
|
recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
|
|
memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
|
|
|
|
dest += recd;
|
|
total += recd;
|
|
num_bytes -= recd;
|
|
} while (retries-- && total < max);
|
|
|
|
tpm_put_ops(chip);
|
|
return total ? total : -EIO;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_get_random);
|
|
|
|
/**
|
|
* tpm_seal_trusted() - seal a trusted key
|
|
* @chip_num: A specific chip number for the request or TPM_ANY_NUM
|
|
* @options: authentication values and other options
|
|
* @payload: the key data in clear and encrypted form
|
|
*
|
|
* Returns < 0 on error and 0 on success. At the moment, only TPM 2.0 chips
|
|
* are supported.
|
|
*/
|
|
int tpm_seal_trusted(u32 chip_num, struct trusted_key_payload *payload,
|
|
struct trusted_key_options *options)
|
|
{
|
|
struct tpm_chip *chip;
|
|
int rc;
|
|
|
|
chip = tpm_chip_find_get(chip_num);
|
|
if (chip == NULL || !(chip->flags & TPM_CHIP_FLAG_TPM2))
|
|
return -ENODEV;
|
|
|
|
rc = tpm2_seal_trusted(chip, payload, options);
|
|
|
|
tpm_put_ops(chip);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_seal_trusted);
|
|
|
|
/**
|
|
* tpm_unseal_trusted() - unseal a trusted key
|
|
* @chip_num: A specific chip number for the request or TPM_ANY_NUM
|
|
* @options: authentication values and other options
|
|
* @payload: the key data in clear and encrypted form
|
|
*
|
|
* Returns < 0 on error and 0 on success. At the moment, only TPM 2.0 chips
|
|
* are supported.
|
|
*/
|
|
int tpm_unseal_trusted(u32 chip_num, struct trusted_key_payload *payload,
|
|
struct trusted_key_options *options)
|
|
{
|
|
struct tpm_chip *chip;
|
|
int rc;
|
|
|
|
chip = tpm_chip_find_get(chip_num);
|
|
if (chip == NULL || !(chip->flags & TPM_CHIP_FLAG_TPM2))
|
|
return -ENODEV;
|
|
|
|
rc = tpm2_unseal_trusted(chip, payload, options);
|
|
|
|
tpm_put_ops(chip);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_unseal_trusted);
|
|
|
|
static int __init tpm_init(void)
|
|
{
|
|
int rc;
|
|
|
|
tpm_class = class_create(THIS_MODULE, "tpm");
|
|
if (IS_ERR(tpm_class)) {
|
|
pr_err("couldn't create tpm class\n");
|
|
return PTR_ERR(tpm_class);
|
|
}
|
|
|
|
rc = alloc_chrdev_region(&tpm_devt, 0, TPM_NUM_DEVICES, "tpm");
|
|
if (rc < 0) {
|
|
pr_err("tpm: failed to allocate char dev region\n");
|
|
class_destroy(tpm_class);
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit tpm_exit(void)
|
|
{
|
|
idr_destroy(&dev_nums_idr);
|
|
class_destroy(tpm_class);
|
|
unregister_chrdev_region(tpm_devt, TPM_NUM_DEVICES);
|
|
}
|
|
|
|
subsys_initcall(tpm_init);
|
|
module_exit(tpm_exit);
|
|
|
|
MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
|
|
MODULE_DESCRIPTION("TPM Driver");
|
|
MODULE_VERSION("2.0");
|
|
MODULE_LICENSE("GPL");
|