![Kylene Jo Hall](/assets/img/avatar_default.png)
Since after reconsideration this is more debug output than an error (the TPM is operating correctly given the current state) I have changed the statements to dbg rather than err. Also this patch corrects a memory leak if the error path is taken in the tpm_show_pubek function. Signed-off-by: Kylene Hall <kjhall@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
608 lines
14 KiB
C
608 lines
14 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/sched.h>
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#include <linux/poll.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 = 2048,
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TPM_NUM_DEVICES = 256,
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TPM_NUM_MASK_ENTRIES = TPM_NUM_DEVICES / (8 * sizeof(int))
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};
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static LIST_HEAD(tpm_chip_list);
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static DEFINE_SPINLOCK(driver_lock);
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static int dev_mask[TPM_NUM_MASK_ENTRIES];
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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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down(&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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up(&chip->buffer_mutex);
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}
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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;
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unsigned long stop;
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count = be32_to_cpu(*((__be32 *) (buf + 2)));
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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->pci_dev->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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down(&chip->tpm_mutex);
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if ((rc = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
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dev_err(&chip->pci_dev->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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stop = jiffies + 2 * 60 * HZ;
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do {
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u8 status = inb(chip->vendor->base + 1);
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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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}
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if ((status == chip->vendor->req_canceled)) {
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dev_err(&chip->pci_dev->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->pci_dev->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->pci_dev->dev,
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"tpm_transmit: tpm_recv: error %zd\n", rc);
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out:
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up(&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 CAP_PCR_RESULT_SIZE 18
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static const u8 cap_pcr[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 22, /* length */
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0, 0, 0, 101, /* TPM_ORD_GetCapability */
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0, 0, 0, 5,
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0, 0, 0, 4,
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0, 0, 1, 1
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};
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#define READ_PCR_RESULT_SIZE 30
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static const u8 pcrread[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 14, /* length */
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0, 0, 0, 21, /* TPM_ORD_PcrRead */
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0, 0, 0, 0 /* PCR index */
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};
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ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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u8 data[READ_PCR_RESULT_SIZE];
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ssize_t len;
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int i, j, num_pcrs;
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__be32 index;
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char *str = buf;
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struct tpm_chip *chip =
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pci_get_drvdata(to_pci_dev(dev));
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if (chip == NULL)
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return -ENODEV;
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memcpy(data, cap_pcr, sizeof(cap_pcr));
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if ((len = tpm_transmit(chip, data, sizeof(data)))
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< CAP_PCR_RESULT_SIZE) {
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dev_dbg(&chip->pci_dev->dev, "A TPM error (%d) occurred "
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"attempting to determine the number of PCRS\n",
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be32_to_cpu(*((__be32 *) (data + 6))));
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return 0;
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}
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num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
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for (i = 0; i < num_pcrs; i++) {
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memcpy(data, pcrread, sizeof(pcrread));
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index = cpu_to_be32(i);
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memcpy(data + 10, &index, 4);
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if ((len = tpm_transmit(chip, data, sizeof(data)))
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< READ_PCR_RESULT_SIZE){
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dev_dbg(&chip->pci_dev->dev, "A TPM error (%d) occurred"
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" attempting to read PCR %d of %d\n",
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be32_to_cpu(*((__be32 *) (data + 6))), i, num_pcrs);
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goto out;
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}
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str += sprintf(str, "PCR-%02d: ", i);
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for (j = 0; j < TPM_DIGEST_SIZE; j++)
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str += sprintf(str, "%02X ", *(data + 10 + j));
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str += sprintf(str, "\n");
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}
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out:
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return str - buf;
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}
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EXPORT_SYMBOL_GPL(tpm_show_pcrs);
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#define READ_PUBEK_RESULT_SIZE 314
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static const u8 readpubek[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 30, /* length */
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0, 0, 0, 124, /* TPM_ORD_ReadPubek */
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};
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ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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u8 *data;
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ssize_t len;
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int i, rc;
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char *str = buf;
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struct tpm_chip *chip =
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pci_get_drvdata(to_pci_dev(dev));
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if (chip == NULL)
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return -ENODEV;
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data = kmalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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memcpy(data, readpubek, sizeof(readpubek));
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memset(data + sizeof(readpubek), 0, 20); /* zero nonce */
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if ((len = tpm_transmit(chip, data, READ_PUBEK_RESULT_SIZE)) <
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READ_PUBEK_RESULT_SIZE) {
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dev_dbg(&chip->pci_dev->dev, "A TPM error (%d) occurred "
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"attempting to read the PUBEK\n",
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be32_to_cpu(*((__be32 *) (data + 6))));
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rc = 0;
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goto out;
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}
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/*
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ignore header 10 bytes
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algorithm 32 bits (1 == RSA )
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encscheme 16 bits
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sigscheme 16 bits
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parameters (RSA 12->bytes: keybit, #primes, expbit)
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keylenbytes 32 bits
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256 byte modulus
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ignore checksum 20 bytes
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*/
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str +=
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sprintf(str,
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"Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
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"Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
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" %02X %02X %02X %02X %02X %02X %02X %02X\n"
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"Modulus length: %d\nModulus: \n",
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data[10], data[11], data[12], data[13], data[14],
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data[15], data[16], data[17], data[22], data[23],
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data[24], data[25], data[26], data[27], data[28],
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data[29], data[30], data[31], data[32], data[33],
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be32_to_cpu(*((__be32 *) (data + 32))));
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for (i = 0; i < 256; i++) {
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str += sprintf(str, "%02X ", data[i + 39]);
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if ((i + 1) % 16 == 0)
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str += sprintf(str, "\n");
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}
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rc = str - buf;
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out:
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kfree(data);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tpm_show_pubek);
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#define CAP_VER_RESULT_SIZE 18
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static const u8 cap_version[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 18, /* length */
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0, 0, 0, 101, /* TPM_ORD_GetCapability */
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0, 0, 0, 6,
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0, 0, 0, 0
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};
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#define CAP_MANUFACTURER_RESULT_SIZE 18
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static const u8 cap_manufacturer[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 22, /* length */
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0, 0, 0, 101, /* TPM_ORD_GetCapability */
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0, 0, 0, 5,
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0, 0, 0, 4,
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0, 0, 1, 3
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};
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ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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u8 data[sizeof(cap_manufacturer)];
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ssize_t len;
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char *str = buf;
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struct tpm_chip *chip =
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pci_get_drvdata(to_pci_dev(dev));
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if (chip == NULL)
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return -ENODEV;
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memcpy(data, cap_manufacturer, sizeof(cap_manufacturer));
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if ((len = tpm_transmit(chip, data, sizeof(data))) <
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CAP_MANUFACTURER_RESULT_SIZE)
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return len;
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str += sprintf(str, "Manufacturer: 0x%x\n",
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be32_to_cpu(*((__be32 *) (data + 14))));
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memcpy(data, cap_version, sizeof(cap_version));
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if ((len = tpm_transmit(chip, data, sizeof(data))) <
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CAP_VER_RESULT_SIZE)
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return len;
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str +=
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sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n",
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(int) data[14], (int) data[15], (int) data[16],
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(int) data[17]);
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return str - buf;
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}
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EXPORT_SYMBOL_GPL(tpm_show_caps);
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ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct tpm_chip *chip = dev_get_drvdata(dev);
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if (chip == NULL)
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return 0;
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chip->vendor->cancel(chip);
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return count;
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}
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EXPORT_SYMBOL_GPL(tpm_store_cancel);
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/*
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* Device file system interface to the TPM
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*/
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int tpm_open(struct inode *inode, struct file *file)
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{
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int rc = 0, minor = iminor(inode);
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struct tpm_chip *chip = NULL, *pos;
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spin_lock(&driver_lock);
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list_for_each_entry(pos, &tpm_chip_list, list) {
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if (pos->vendor->miscdev.minor == minor) {
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chip = pos;
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break;
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}
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}
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if (chip == NULL) {
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rc = -ENODEV;
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goto err_out;
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}
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if (chip->num_opens) {
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dev_dbg(&chip->pci_dev->dev,
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"Another process owns this TPM\n");
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rc = -EBUSY;
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goto err_out;
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}
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chip->num_opens++;
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pci_dev_get(chip->pci_dev);
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spin_unlock(&driver_lock);
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chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
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if (chip->data_buffer == NULL) {
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chip->num_opens--;
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pci_dev_put(chip->pci_dev);
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return -ENOMEM;
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}
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atomic_set(&chip->data_pending, 0);
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file->private_data = chip;
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return 0;
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err_out:
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spin_unlock(&driver_lock);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tpm_open);
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int tpm_release(struct inode *inode, struct file *file)
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{
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struct tpm_chip *chip = file->private_data;
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spin_lock(&driver_lock);
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file->private_data = NULL;
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chip->num_opens--;
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del_singleshot_timer_sync(&chip->user_read_timer);
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atomic_set(&chip->data_pending, 0);
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pci_dev_put(chip->pci_dev);
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kfree(chip->data_buffer);
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spin_unlock(&driver_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(tpm_release);
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ssize_t tpm_write(struct file * file, const char __user * buf,
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size_t size, loff_t * off)
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{
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struct tpm_chip *chip = file->private_data;
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int in_size = size, out_size;
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/* cannot perform a write until the read has cleared
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either via tpm_read or a user_read_timer timeout */
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while (atomic_read(&chip->data_pending) != 0)
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msleep(TPM_TIMEOUT);
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down(&chip->buffer_mutex);
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if (in_size > TPM_BUFSIZE)
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in_size = TPM_BUFSIZE;
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if (copy_from_user
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(chip->data_buffer, (void __user *) buf, in_size)) {
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up(&chip->buffer_mutex);
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return -EFAULT;
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}
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/* atomic tpm command send and result receive */
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out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
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atomic_set(&chip->data_pending, out_size);
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up(&chip->buffer_mutex);
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/* Set a timeout by which the reader must come claim the result */
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mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
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return in_size;
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}
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EXPORT_SYMBOL_GPL(tpm_write);
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ssize_t tpm_read(struct file * file, char __user * buf,
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size_t size, loff_t * off)
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{
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struct tpm_chip *chip = file->private_data;
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int ret_size;
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del_singleshot_timer_sync(&chip->user_read_timer);
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ret_size = atomic_read(&chip->data_pending);
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atomic_set(&chip->data_pending, 0);
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if (ret_size > 0) { /* relay data */
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if (size < ret_size)
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ret_size = size;
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down(&chip->buffer_mutex);
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if (copy_to_user
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((void __user *) buf, chip->data_buffer, ret_size))
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ret_size = -EFAULT;
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up(&chip->buffer_mutex);
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}
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return ret_size;
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}
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EXPORT_SYMBOL_GPL(tpm_read);
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void __devexit tpm_remove(struct pci_dev *pci_dev)
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{
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struct tpm_chip *chip = pci_get_drvdata(pci_dev);
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if (chip == NULL) {
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dev_err(&pci_dev->dev, "No device data found\n");
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return;
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}
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spin_lock(&driver_lock);
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list_del(&chip->list);
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spin_unlock(&driver_lock);
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pci_set_drvdata(pci_dev, NULL);
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misc_deregister(&chip->vendor->miscdev);
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sysfs_remove_group(&pci_dev->dev.kobj, chip->vendor->attr_group);
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pci_disable_device(pci_dev);
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dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES ] &= !(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES));
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kfree(chip);
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pci_dev_put(pci_dev);
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}
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EXPORT_SYMBOL_GPL(tpm_remove);
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static u8 savestate[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 10, /* blob length (in bytes) */
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0, 0, 0, 152 /* TPM_ORD_SaveState */
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};
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/*
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* We are about to suspend. Save the TPM state
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* so that it can be restored.
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*/
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int tpm_pm_suspend(struct pci_dev *pci_dev, pm_message_t pm_state)
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{
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struct tpm_chip *chip = pci_get_drvdata(pci_dev);
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if (chip == NULL)
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return -ENODEV;
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tpm_transmit(chip, savestate, sizeof(savestate));
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return 0;
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}
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EXPORT_SYMBOL_GPL(tpm_pm_suspend);
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/*
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* Resume from a power safe. The BIOS already restored
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* the TPM state.
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*/
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int tpm_pm_resume(struct pci_dev *pci_dev)
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{
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struct tpm_chip *chip = pci_get_drvdata(pci_dev);
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if (chip == NULL)
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return -ENODEV;
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return 0;
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}
|
|
|
|
EXPORT_SYMBOL_GPL(tpm_pm_resume);
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
int tpm_register_hardware(struct pci_dev *pci_dev,
|
|
struct tpm_vendor_specific *entry)
|
|
{
|
|
char devname[7];
|
|
struct tpm_chip *chip;
|
|
int i, j;
|
|
|
|
/* Driver specific per-device data */
|
|
chip = kmalloc(sizeof(*chip), GFP_KERNEL);
|
|
if (chip == NULL)
|
|
return -ENOMEM;
|
|
|
|
memset(chip, 0, sizeof(struct tpm_chip));
|
|
|
|
init_MUTEX(&chip->buffer_mutex);
|
|
init_MUTEX(&chip->tpm_mutex);
|
|
INIT_LIST_HEAD(&chip->list);
|
|
|
|
init_timer(&chip->user_read_timer);
|
|
chip->user_read_timer.function = user_reader_timeout;
|
|
chip->user_read_timer.data = (unsigned long) chip;
|
|
|
|
chip->vendor = entry;
|
|
|
|
chip->dev_num = -1;
|
|
|
|
for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++)
|
|
for (j = 0; j < 8 * sizeof(int); j++)
|
|
if ((dev_mask[i] & (1 << j)) == 0) {
|
|
chip->dev_num =
|
|
i * TPM_NUM_MASK_ENTRIES + j;
|
|
dev_mask[i] |= 1 << j;
|
|
goto dev_num_search_complete;
|
|
}
|
|
|
|
dev_num_search_complete:
|
|
if (chip->dev_num < 0) {
|
|
dev_err(&pci_dev->dev,
|
|
"No available tpm device numbers\n");
|
|
kfree(chip);
|
|
return -ENODEV;
|
|
} else if (chip->dev_num == 0)
|
|
chip->vendor->miscdev.minor = TPM_MINOR;
|
|
else
|
|
chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR;
|
|
|
|
snprintf(devname, sizeof(devname), "%s%d", "tpm", chip->dev_num);
|
|
chip->vendor->miscdev.name = devname;
|
|
|
|
chip->vendor->miscdev.dev = &(pci_dev->dev);
|
|
chip->pci_dev = pci_dev_get(pci_dev);
|
|
|
|
if (misc_register(&chip->vendor->miscdev)) {
|
|
dev_err(&chip->pci_dev->dev,
|
|
"unable to misc_register %s, minor %d\n",
|
|
chip->vendor->miscdev.name,
|
|
chip->vendor->miscdev.minor);
|
|
pci_dev_put(pci_dev);
|
|
kfree(chip);
|
|
dev_mask[i] &= !(1 << j);
|
|
return -ENODEV;
|
|
}
|
|
|
|
spin_lock(&driver_lock);
|
|
|
|
pci_set_drvdata(pci_dev, chip);
|
|
|
|
list_add(&chip->list, &tpm_chip_list);
|
|
|
|
spin_unlock(&driver_lock);
|
|
|
|
sysfs_create_group(&pci_dev->dev.kobj, chip->vendor->attr_group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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");
|