forked from Minki/linux
13b47cfcfc
While cleaning up sysfs callback that prints EK we discovered a kernel
memory leak. This commit fixes the issue by zeroing the buffer used for
TPM command/response.
The leak happen when we use either tpm_vtpm_proxy, tpm_ibmvtpm or
xen-tpmfront.
Cc: stable@vger.kernel.org
Fixes: 0883743825 ("TPM: sysfs functions consolidation")
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
311 lines
8.0 KiB
C
311 lines
8.0 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 124
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static const struct tpm_input_header tpm_readpubek_header = {
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.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
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.length = cpu_to_be32(30),
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.ordinal = cpu_to_be32(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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memset(&tpm_cmd, 0, sizeof(tpm_cmd));
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tpm_cmd.header.in = tpm_readpubek_header;
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err = tpm_transmit_cmd(chip, NULL, &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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/* XXX: If you wish to remove this restriction, you must first update
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* tpm_sysfs to explicitly lock chip->ops.
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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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