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![Stefan Berger](/assets/img/avatar_default.png)
Make sure that we have not received less bytes than what is indicated in the header of the TPM response. Also, check the number of bytes in the response before accessing its data. Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
306 lines
7.9 KiB
C
306 lines
7.9 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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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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* Copyright (C) 2013 Obsidian Research Corp
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* Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
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*
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* sysfs filesystem inspection interface to the TPM
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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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*/
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#include <linux/device.h>
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#include "tpm.h"
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#define READ_PUBEK_RESULT_SIZE 314
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#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
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#define TPM_ORD_READPUBEK cpu_to_be32(124)
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static const struct tpm_input_header tpm_readpubek_header = {
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.tag = TPM_TAG_RQU_COMMAND,
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.length = cpu_to_be32(30),
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.ordinal = TPM_ORD_READPUBEK
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};
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static ssize_t pubek_show(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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struct tpm_cmd_t tpm_cmd;
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ssize_t err;
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int i, rc;
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char *str = buf;
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struct tpm_chip *chip = to_tpm_chip(dev);
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tpm_cmd.header.in = tpm_readpubek_header;
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err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
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READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
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"attempting to read the PUBEK");
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if (err)
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goto out;
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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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data = tpm_cmd.params.readpubek_out_buffer;
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str +=
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sprintf(str,
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"Algorithm: %02X %02X %02X %02X\n"
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"Encscheme: %02X %02X\n"
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"Sigscheme: %02X %02X\n"
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"Parameters: %02X %02X %02X %02X "
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"%02X %02X %02X %02X "
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"%02X %02X %02X %02X\n"
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"Modulus length: %d\n"
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"Modulus:\n",
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data[0], data[1], data[2], data[3],
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data[4], data[5],
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data[6], data[7],
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data[12], data[13], data[14], data[15],
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data[16], data[17], data[18], data[19],
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data[20], data[21], data[22], data[23],
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be32_to_cpu(*((__be32 *) (data + 24))));
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for (i = 0; i < 256; i++) {
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str += sprintf(str, "%02X ", data[i + 28]);
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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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out:
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rc = str - buf;
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return rc;
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}
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static DEVICE_ATTR_RO(pubek);
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static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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cap_t cap;
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u8 digest[TPM_DIGEST_SIZE];
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ssize_t rc;
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int i, j, num_pcrs;
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char *str = buf;
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struct tpm_chip *chip = to_tpm_chip(dev);
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rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap,
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"attempting to determine the number of PCRS",
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sizeof(cap.num_pcrs));
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if (rc)
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return 0;
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num_pcrs = be32_to_cpu(cap.num_pcrs);
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for (i = 0; i < num_pcrs; i++) {
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rc = tpm_pcr_read_dev(chip, i, digest);
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if (rc)
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break;
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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 ", digest[j]);
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str += sprintf(str, "\n");
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}
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return str - buf;
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}
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static DEVICE_ATTR_RO(pcrs);
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static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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cap_t cap;
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ssize_t rc;
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rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
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"attempting to determine the permanent enabled state",
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sizeof(cap.perm_flags));
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if (rc)
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return 0;
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rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
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return rc;
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}
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static DEVICE_ATTR_RO(enabled);
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static ssize_t active_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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cap_t cap;
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ssize_t rc;
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rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
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"attempting to determine the permanent active state",
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sizeof(cap.perm_flags));
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if (rc)
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return 0;
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rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
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return rc;
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}
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static DEVICE_ATTR_RO(active);
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static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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cap_t cap;
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ssize_t rc;
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rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
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"attempting to determine the owner state",
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sizeof(cap.owned));
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if (rc)
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return 0;
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rc = sprintf(buf, "%d\n", cap.owned);
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return rc;
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}
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static DEVICE_ATTR_RO(owned);
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static ssize_t temp_deactivated_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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cap_t cap;
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ssize_t rc;
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rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
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"attempting to determine the temporary state",
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sizeof(cap.stclear_flags));
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if (rc)
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return 0;
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rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
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return rc;
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}
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static DEVICE_ATTR_RO(temp_deactivated);
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static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tpm_chip *chip = to_tpm_chip(dev);
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cap_t cap;
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ssize_t rc;
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char *str = buf;
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rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
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"attempting to determine the manufacturer",
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sizeof(cap.manufacturer_id));
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if (rc)
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return 0;
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str += sprintf(str, "Manufacturer: 0x%x\n",
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be32_to_cpu(cap.manufacturer_id));
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/* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
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rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
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"attempting to determine the 1.2 version",
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sizeof(cap.tpm_version_1_2));
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if (!rc) {
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str += sprintf(str,
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"TCG version: %d.%d\nFirmware version: %d.%d\n",
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cap.tpm_version_1_2.Major,
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cap.tpm_version_1_2.Minor,
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cap.tpm_version_1_2.revMajor,
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cap.tpm_version_1_2.revMinor);
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} else {
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/* Otherwise just use TPM_STRUCT_VER */
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rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
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"attempting to determine the 1.1 version",
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sizeof(cap.tpm_version));
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if (rc)
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return 0;
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str += sprintf(str,
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"TCG version: %d.%d\nFirmware version: %d.%d\n",
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cap.tpm_version.Major,
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cap.tpm_version.Minor,
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cap.tpm_version.revMajor,
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cap.tpm_version.revMinor);
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}
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return str - buf;
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}
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static DEVICE_ATTR_RO(caps);
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static ssize_t cancel_store(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 = to_tpm_chip(dev);
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if (chip == NULL)
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return 0;
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chip->ops->cancel(chip);
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return count;
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}
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static DEVICE_ATTR_WO(cancel);
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static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tpm_chip *chip = to_tpm_chip(dev);
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if (chip->duration[TPM_LONG] == 0)
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return 0;
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return sprintf(buf, "%d %d %d [%s]\n",
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jiffies_to_usecs(chip->duration[TPM_SHORT]),
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jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
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jiffies_to_usecs(chip->duration[TPM_LONG]),
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chip->duration_adjusted
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? "adjusted" : "original");
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}
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static DEVICE_ATTR_RO(durations);
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static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tpm_chip *chip = to_tpm_chip(dev);
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return sprintf(buf, "%d %d %d %d [%s]\n",
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jiffies_to_usecs(chip->timeout_a),
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jiffies_to_usecs(chip->timeout_b),
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jiffies_to_usecs(chip->timeout_c),
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jiffies_to_usecs(chip->timeout_d),
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chip->timeout_adjusted
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? "adjusted" : "original");
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}
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static DEVICE_ATTR_RO(timeouts);
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static struct attribute *tpm_dev_attrs[] = {
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&dev_attr_pubek.attr,
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&dev_attr_pcrs.attr,
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&dev_attr_enabled.attr,
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&dev_attr_active.attr,
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&dev_attr_owned.attr,
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&dev_attr_temp_deactivated.attr,
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&dev_attr_caps.attr,
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&dev_attr_cancel.attr,
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&dev_attr_durations.attr,
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&dev_attr_timeouts.attr,
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NULL,
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};
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static const struct attribute_group tpm_dev_group = {
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.attrs = tpm_dev_attrs,
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};
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void tpm_sysfs_add_device(struct tpm_chip *chip)
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{
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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return;
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/* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
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* is called before ops is null'd and the sysfs core synchronizes this
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* removal so that no callbacks are running or can run again
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*/
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WARN_ON(chip->groups_cnt != 0);
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chip->groups[chip->groups_cnt++] = &tpm_dev_group;
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}
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