1224 lines
28 KiB
C
1224 lines
28 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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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/mutex.h>
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#include <linux/spinlock.h>
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#include "tpm.h"
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enum tpm_const {
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TPM_MINOR = 224, /* officially assigned */
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TPM_BUFSIZE = 4096,
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TPM_NUM_DEVICES = 256,
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};
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enum tpm_duration {
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TPM_SHORT = 0,
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TPM_MEDIUM = 1,
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TPM_LONG = 2,
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TPM_UNDEFINED,
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};
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#define TPM_MAX_ORDINAL 243
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#define TPM_MAX_PROTECTED_ORDINAL 12
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#define TPM_PROTECTED_ORDINAL_MASK 0xFF
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static LIST_HEAD(tpm_chip_list);
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static DEFINE_SPINLOCK(driver_lock);
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static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
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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_protected_ordinal_duration[TPM_MAX_PROTECTED_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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};
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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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static void user_reader_timeout(unsigned long ptr)
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{
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struct tpm_chip *chip = (struct tpm_chip *) ptr;
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schedule_work(&chip->work);
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}
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static void timeout_work(struct work_struct *work)
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{
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struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
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mutex_lock(&chip->buffer_mutex);
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atomic_set(&chip->data_pending, 0);
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memset(chip->data_buffer, 0, TPM_BUFSIZE);
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mutex_unlock(&chip->buffer_mutex);
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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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if (ordinal < TPM_MAX_ORDINAL)
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duration_idx = tpm_ordinal_duration[ordinal];
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else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
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TPM_MAX_PROTECTED_ORDINAL)
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duration_idx =
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tpm_protected_ordinal_duration[ordinal &
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TPM_PROTECTED_ORDINAL_MASK];
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if (duration_idx != TPM_UNDEFINED)
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duration = chip->vendor.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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static 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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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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if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 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->vendor.irq)
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goto out_recv;
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stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
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do {
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u8 status = chip->vendor.status(chip);
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if ((status & chip->vendor.req_complete_mask) ==
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chip->vendor.req_complete_val)
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goto out_recv;
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if ((status == chip->vendor.req_canceled)) {
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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->vendor.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->vendor.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_ERROR_SIZE 10
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#define TPM_RET_CODE_IDX 6
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enum tpm_capabilities {
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TPM_CAP_FLAG = cpu_to_be32(4),
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TPM_CAP_PROP = cpu_to_be32(5),
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CAP_VERSION_1_1 = cpu_to_be32(0x06),
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CAP_VERSION_1_2 = cpu_to_be32(0x1A)
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};
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enum tpm_sub_capabilities {
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TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
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TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
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TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
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TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
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TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
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TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
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TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
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};
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static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
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int len, const char *desc)
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{
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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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if (len == TPM_ERROR_SIZE) {
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err = be32_to_cpu(cmd->header.out.return_code);
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dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
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return err;
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}
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return 0;
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}
|
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|
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#define TPM_INTERNAL_RESULT_SIZE 200
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#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
|
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#define TPM_ORD_GET_CAP cpu_to_be32(101)
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|
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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 device *dev, __be32 subcap_id, cap_t *cap,
|
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const char *desc)
|
|
{
|
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struct tpm_cmd_t tpm_cmd;
|
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int rc;
|
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struct tpm_chip *chip = dev_get_drvdata(dev);
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|
|
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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;
|
|
/*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);
|
|
tpm_cmd.params.getcap_in.subcap = subcap_id;
|
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}
|
|
rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
|
|
if (!rc)
|
|
*cap = tpm_cmd.params.getcap_out.cap;
|
|
return rc;
|
|
}
|
|
|
|
void tpm_gen_interrupt(struct tpm_chip *chip)
|
|
{
|
|
struct tpm_cmd_t tpm_cmd;
|
|
ssize_t 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 = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
|
|
"attempting to determine the timeouts");
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
|
|
|
|
void tpm_get_timeouts(struct tpm_chip *chip)
|
|
{
|
|
struct tpm_cmd_t tpm_cmd;
|
|
struct timeout_t *timeout_cap;
|
|
struct duration_t *duration_cap;
|
|
ssize_t rc;
|
|
u32 timeout;
|
|
|
|
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 = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
|
|
"attempting to determine the timeouts");
|
|
if (rc)
|
|
goto duration;
|
|
|
|
if (be32_to_cpu(tpm_cmd.header.out.length)
|
|
!= 4 * sizeof(u32))
|
|
goto duration;
|
|
|
|
timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
|
|
/* Don't overwrite default if value is 0 */
|
|
timeout = be32_to_cpu(timeout_cap->a);
|
|
if (timeout)
|
|
chip->vendor.timeout_a = usecs_to_jiffies(timeout);
|
|
timeout = be32_to_cpu(timeout_cap->b);
|
|
if (timeout)
|
|
chip->vendor.timeout_b = usecs_to_jiffies(timeout);
|
|
timeout = be32_to_cpu(timeout_cap->c);
|
|
if (timeout)
|
|
chip->vendor.timeout_c = usecs_to_jiffies(timeout);
|
|
timeout = be32_to_cpu(timeout_cap->d);
|
|
if (timeout)
|
|
chip->vendor.timeout_d = usecs_to_jiffies(timeout);
|
|
|
|
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 = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
|
|
"attempting to determine the durations");
|
|
if (rc)
|
|
return;
|
|
|
|
if (be32_to_cpu(tpm_cmd.header.out.return_code)
|
|
!= 3 * sizeof(u32))
|
|
return;
|
|
duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
|
|
chip->vendor.duration[TPM_SHORT] =
|
|
usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
|
|
/* 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.
|
|
*/
|
|
if (chip->vendor.duration[TPM_SHORT] < (HZ/100))
|
|
chip->vendor.duration[TPM_SHORT] = HZ;
|
|
|
|
chip->vendor.duration[TPM_MEDIUM] =
|
|
usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
|
|
chip->vendor.duration[TPM_LONG] =
|
|
usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_get_timeouts);
|
|
|
|
void tpm_continue_selftest(struct tpm_chip *chip)
|
|
{
|
|
u8 data[] = {
|
|
0, 193, /* TPM_TAG_RQU_COMMAND */
|
|
0, 0, 0, 10, /* length */
|
|
0, 0, 0, 83, /* TPM_ORD_GetCapability */
|
|
};
|
|
|
|
tpm_transmit(chip, data, sizeof(data));
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_continue_selftest);
|
|
|
|
ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
|
|
char *buf)
|
|
{
|
|
cap_t cap;
|
|
ssize_t rc;
|
|
|
|
rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
|
|
"attempting to determine the permanent enabled state");
|
|
if (rc)
|
|
return 0;
|
|
|
|
rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_show_enabled);
|
|
|
|
ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
|
|
char *buf)
|
|
{
|
|
cap_t cap;
|
|
ssize_t rc;
|
|
|
|
rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
|
|
"attempting to determine the permanent active state");
|
|
if (rc)
|
|
return 0;
|
|
|
|
rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_show_active);
|
|
|
|
ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
|
|
char *buf)
|
|
{
|
|
cap_t cap;
|
|
ssize_t rc;
|
|
|
|
rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
|
|
"attempting to determine the owner state");
|
|
if (rc)
|
|
return 0;
|
|
|
|
rc = sprintf(buf, "%d\n", cap.owned);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_show_owned);
|
|
|
|
ssize_t tpm_show_temp_deactivated(struct device * dev,
|
|
struct device_attribute * attr, char *buf)
|
|
{
|
|
cap_t cap;
|
|
ssize_t rc;
|
|
|
|
rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
|
|
"attempting to determine the temporary state");
|
|
if (rc)
|
|
return 0;
|
|
|
|
rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
|
|
|
|
/*
|
|
* tpm_chip_find_get - return tpm_chip for given chip number
|
|
*/
|
|
static struct tpm_chip *tpm_chip_find_get(int chip_num)
|
|
{
|
|
struct tpm_chip *pos, *chip = NULL;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
|
|
if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
|
|
continue;
|
|
|
|
if (try_module_get(pos->dev->driver->owner)) {
|
|
chip = pos;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return chip;
|
|
}
|
|
|
|
#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(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 = 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_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;
|
|
rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
|
|
module_put(chip->dev->driver->owner);
|
|
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;
|
|
|
|
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 = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
|
|
"attempting extend a PCR value");
|
|
|
|
module_put(chip->dev->driver->owner);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_pcr_extend);
|
|
|
|
ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
cap_t cap;
|
|
u8 digest[TPM_DIGEST_SIZE];
|
|
ssize_t rc;
|
|
int i, j, num_pcrs;
|
|
char *str = buf;
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
|
|
rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
|
|
"attempting to determine the number of PCRS");
|
|
if (rc)
|
|
return 0;
|
|
|
|
num_pcrs = be32_to_cpu(cap.num_pcrs);
|
|
for (i = 0; i < num_pcrs; i++) {
|
|
rc = __tpm_pcr_read(chip, i, digest);
|
|
if (rc)
|
|
break;
|
|
str += sprintf(str, "PCR-%02d: ", i);
|
|
for (j = 0; j < TPM_DIGEST_SIZE; j++)
|
|
str += sprintf(str, "%02X ", digest[j]);
|
|
str += sprintf(str, "\n");
|
|
}
|
|
return str - buf;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_show_pcrs);
|
|
|
|
#define READ_PUBEK_RESULT_SIZE 314
|
|
#define TPM_ORD_READPUBEK cpu_to_be32(124)
|
|
struct tpm_input_header tpm_readpubek_header = {
|
|
.tag = TPM_TAG_RQU_COMMAND,
|
|
.length = cpu_to_be32(30),
|
|
.ordinal = TPM_ORD_READPUBEK
|
|
};
|
|
|
|
ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
u8 *data;
|
|
struct tpm_cmd_t tpm_cmd;
|
|
ssize_t err;
|
|
int i, rc;
|
|
char *str = buf;
|
|
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
|
|
tpm_cmd.header.in = tpm_readpubek_header;
|
|
err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
|
|
"attempting to read the PUBEK");
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
ignore header 10 bytes
|
|
algorithm 32 bits (1 == RSA )
|
|
encscheme 16 bits
|
|
sigscheme 16 bits
|
|
parameters (RSA 12->bytes: keybit, #primes, expbit)
|
|
keylenbytes 32 bits
|
|
256 byte modulus
|
|
ignore checksum 20 bytes
|
|
*/
|
|
data = tpm_cmd.params.readpubek_out_buffer;
|
|
str +=
|
|
sprintf(str,
|
|
"Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
|
|
"Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
|
|
" %02X %02X %02X %02X %02X %02X %02X %02X\n"
|
|
"Modulus length: %d\nModulus: \n",
|
|
data[10], data[11], data[12], data[13], data[14],
|
|
data[15], data[16], data[17], data[22], data[23],
|
|
data[24], data[25], data[26], data[27], data[28],
|
|
data[29], data[30], data[31], data[32], data[33],
|
|
be32_to_cpu(*((__be32 *) (data + 34))));
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
str += sprintf(str, "%02X ", data[i + 38]);
|
|
if ((i + 1) % 16 == 0)
|
|
str += sprintf(str, "\n");
|
|
}
|
|
out:
|
|
rc = str - buf;
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_show_pubek);
|
|
|
|
|
|
ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
cap_t cap;
|
|
ssize_t rc;
|
|
char *str = buf;
|
|
|
|
rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
|
|
"attempting to determine the manufacturer");
|
|
if (rc)
|
|
return 0;
|
|
str += sprintf(str, "Manufacturer: 0x%x\n",
|
|
be32_to_cpu(cap.manufacturer_id));
|
|
|
|
rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
|
|
"attempting to determine the 1.1 version");
|
|
if (rc)
|
|
return 0;
|
|
str += sprintf(str,
|
|
"TCG version: %d.%d\nFirmware version: %d.%d\n",
|
|
cap.tpm_version.Major, cap.tpm_version.Minor,
|
|
cap.tpm_version.revMajor, cap.tpm_version.revMinor);
|
|
return str - buf;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_show_caps);
|
|
|
|
ssize_t tpm_show_caps_1_2(struct device * dev,
|
|
struct device_attribute * attr, char *buf)
|
|
{
|
|
cap_t cap;
|
|
ssize_t rc;
|
|
char *str = buf;
|
|
|
|
rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
|
|
"attempting to determine the manufacturer");
|
|
if (rc)
|
|
return 0;
|
|
str += sprintf(str, "Manufacturer: 0x%x\n",
|
|
be32_to_cpu(cap.manufacturer_id));
|
|
rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
|
|
"attempting to determine the 1.2 version");
|
|
if (rc)
|
|
return 0;
|
|
str += sprintf(str,
|
|
"TCG version: %d.%d\nFirmware version: %d.%d\n",
|
|
cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
|
|
cap.tpm_version_1_2.revMajor,
|
|
cap.tpm_version_1_2.revMinor);
|
|
return str - buf;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
|
|
|
|
ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
if (chip == NULL)
|
|
return 0;
|
|
|
|
chip->vendor.cancel(chip);
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_store_cancel);
|
|
|
|
/*
|
|
* Device file system interface to the TPM
|
|
*
|
|
* It's assured that the chip will be opened just once,
|
|
* by the check of is_open variable, which is protected
|
|
* by driver_lock.
|
|
*/
|
|
int tpm_open(struct inode *inode, struct file *file)
|
|
{
|
|
int minor = iminor(inode);
|
|
struct tpm_chip *chip = NULL, *pos;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
|
|
if (pos->vendor.miscdev.minor == minor) {
|
|
chip = pos;
|
|
get_device(chip->dev);
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (!chip)
|
|
return -ENODEV;
|
|
|
|
if (test_and_set_bit(0, &chip->is_open)) {
|
|
dev_dbg(chip->dev, "Another process owns this TPM\n");
|
|
put_device(chip->dev);
|
|
return -EBUSY;
|
|
}
|
|
|
|
chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
|
|
if (chip->data_buffer == NULL) {
|
|
clear_bit(0, &chip->is_open);
|
|
put_device(chip->dev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
atomic_set(&chip->data_pending, 0);
|
|
|
|
file->private_data = chip;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_open);
|
|
|
|
/*
|
|
* Called on file close
|
|
*/
|
|
int tpm_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct tpm_chip *chip = file->private_data;
|
|
|
|
del_singleshot_timer_sync(&chip->user_read_timer);
|
|
flush_scheduled_work();
|
|
file->private_data = NULL;
|
|
atomic_set(&chip->data_pending, 0);
|
|
kfree(chip->data_buffer);
|
|
clear_bit(0, &chip->is_open);
|
|
put_device(chip->dev);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_release);
|
|
|
|
ssize_t tpm_write(struct file *file, const char __user *buf,
|
|
size_t size, loff_t *off)
|
|
{
|
|
struct tpm_chip *chip = file->private_data;
|
|
size_t in_size = size, out_size;
|
|
|
|
/* cannot perform a write until the read has cleared
|
|
either via tpm_read or a user_read_timer timeout */
|
|
while (atomic_read(&chip->data_pending) != 0)
|
|
msleep(TPM_TIMEOUT);
|
|
|
|
mutex_lock(&chip->buffer_mutex);
|
|
|
|
if (in_size > TPM_BUFSIZE)
|
|
in_size = TPM_BUFSIZE;
|
|
|
|
if (copy_from_user
|
|
(chip->data_buffer, (void __user *) buf, in_size)) {
|
|
mutex_unlock(&chip->buffer_mutex);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/* atomic tpm command send and result receive */
|
|
out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
|
|
|
|
atomic_set(&chip->data_pending, out_size);
|
|
mutex_unlock(&chip->buffer_mutex);
|
|
|
|
/* Set a timeout by which the reader must come claim the result */
|
|
mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
|
|
|
|
return in_size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_write);
|
|
|
|
ssize_t tpm_read(struct file *file, char __user *buf,
|
|
size_t size, loff_t *off)
|
|
{
|
|
struct tpm_chip *chip = file->private_data;
|
|
ssize_t ret_size;
|
|
|
|
del_singleshot_timer_sync(&chip->user_read_timer);
|
|
flush_scheduled_work();
|
|
ret_size = atomic_read(&chip->data_pending);
|
|
atomic_set(&chip->data_pending, 0);
|
|
if (ret_size > 0) { /* relay data */
|
|
if (size < ret_size)
|
|
ret_size = size;
|
|
|
|
mutex_lock(&chip->buffer_mutex);
|
|
if (copy_to_user(buf, chip->data_buffer, ret_size))
|
|
ret_size = -EFAULT;
|
|
mutex_unlock(&chip->buffer_mutex);
|
|
}
|
|
|
|
return ret_size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_read);
|
|
|
|
void tpm_remove_hardware(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
|
|
if (chip == NULL) {
|
|
dev_err(dev, "No device data found\n");
|
|
return;
|
|
}
|
|
|
|
spin_lock(&driver_lock);
|
|
list_del_rcu(&chip->list);
|
|
spin_unlock(&driver_lock);
|
|
synchronize_rcu();
|
|
|
|
misc_deregister(&chip->vendor.miscdev);
|
|
sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
|
|
tpm_bios_log_teardown(chip->bios_dir);
|
|
|
|
/* write it this way to be explicit (chip->dev == dev) */
|
|
put_device(chip->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_remove_hardware);
|
|
|
|
/*
|
|
* We are about to suspend. Save the TPM state
|
|
* so that it can be restored.
|
|
*/
|
|
int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
u8 savestate[] = {
|
|
0, 193, /* TPM_TAG_RQU_COMMAND */
|
|
0, 0, 0, 10, /* blob length (in bytes) */
|
|
0, 0, 0, 152 /* TPM_ORD_SaveState */
|
|
};
|
|
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
|
|
tpm_transmit(chip, savestate, sizeof(savestate));
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_pm_suspend);
|
|
|
|
/*
|
|
* Resume from a power safe. The BIOS already restored
|
|
* the TPM state.
|
|
*/
|
|
int tpm_pm_resume(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
|
|
if (chip == NULL)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_pm_resume);
|
|
|
|
/* In case vendor provided release function, call it too.*/
|
|
|
|
void tpm_dev_vendor_release(struct tpm_chip *chip)
|
|
{
|
|
if (chip->vendor.release)
|
|
chip->vendor.release(chip->dev);
|
|
|
|
clear_bit(chip->dev_num, dev_mask);
|
|
kfree(chip->vendor.miscdev.name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
|
|
|
|
|
|
/*
|
|
* Once all references to platform device are down to 0,
|
|
* release all allocated structures.
|
|
*/
|
|
void tpm_dev_release(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
|
|
tpm_dev_vendor_release(chip);
|
|
|
|
chip->release(dev);
|
|
kfree(chip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_dev_release);
|
|
|
|
/*
|
|
* Called from tpm_<specific>.c probe function only for devices
|
|
* the driver has determined it should claim. Prior to calling
|
|
* this function the specific probe function has called pci_enable_device
|
|
* upon errant exit from this function specific probe function should call
|
|
* pci_disable_device
|
|
*/
|
|
struct tpm_chip *tpm_register_hardware(struct device *dev,
|
|
const struct tpm_vendor_specific *entry)
|
|
{
|
|
#define DEVNAME_SIZE 7
|
|
|
|
char *devname;
|
|
struct tpm_chip *chip;
|
|
|
|
/* Driver specific per-device data */
|
|
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
|
|
devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
|
|
|
|
if (chip == NULL || devname == NULL)
|
|
goto out_free;
|
|
|
|
mutex_init(&chip->buffer_mutex);
|
|
mutex_init(&chip->tpm_mutex);
|
|
INIT_LIST_HEAD(&chip->list);
|
|
|
|
INIT_WORK(&chip->work, timeout_work);
|
|
|
|
setup_timer(&chip->user_read_timer, user_reader_timeout,
|
|
(unsigned long)chip);
|
|
|
|
memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
|
|
|
|
chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
|
|
|
|
if (chip->dev_num >= TPM_NUM_DEVICES) {
|
|
dev_err(dev, "No available tpm device numbers\n");
|
|
goto out_free;
|
|
} else if (chip->dev_num == 0)
|
|
chip->vendor.miscdev.minor = TPM_MINOR;
|
|
else
|
|
chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
|
|
|
|
set_bit(chip->dev_num, dev_mask);
|
|
|
|
scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
|
|
chip->vendor.miscdev.name = devname;
|
|
|
|
chip->vendor.miscdev.parent = dev;
|
|
chip->dev = get_device(dev);
|
|
chip->release = dev->release;
|
|
dev->release = tpm_dev_release;
|
|
dev_set_drvdata(dev, chip);
|
|
|
|
if (misc_register(&chip->vendor.miscdev)) {
|
|
dev_err(chip->dev,
|
|
"unable to misc_register %s, minor %d\n",
|
|
chip->vendor.miscdev.name,
|
|
chip->vendor.miscdev.minor);
|
|
put_device(chip->dev);
|
|
return NULL;
|
|
}
|
|
|
|
if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
|
|
misc_deregister(&chip->vendor.miscdev);
|
|
put_device(chip->dev);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
chip->bios_dir = tpm_bios_log_setup(devname);
|
|
|
|
/* Make chip available */
|
|
spin_lock(&driver_lock);
|
|
list_add_rcu(&chip->list, &tpm_chip_list);
|
|
spin_unlock(&driver_lock);
|
|
|
|
return chip;
|
|
|
|
out_free:
|
|
kfree(chip);
|
|
kfree(devname);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_register_hardware);
|
|
|
|
MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
|
|
MODULE_DESCRIPTION("TPM Driver");
|
|
MODULE_VERSION("2.0");
|
|
MODULE_LICENSE("GPL");
|