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![Tianjia Zhang](/assets/img/avatar_default.png)
For the algorithm that does not match the bank, a positive
value EINVAL is returned here. I think this is a typo error.
It is necessary to return an error value.
Cc: stable@vger.kernel.org # 5.4.x
Fixes: 9f75c82246
("KEYS: trusted: correctly initialize digests and fix locking issue")
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Reviewed-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
518 lines
12 KiB
C
518 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2004 IBM Corporation
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* Copyright (C) 2014 Intel Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* 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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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/suspend.h>
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#include <linux/freezer.h>
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#include <linux/tpm_eventlog.h>
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#include "tpm.h"
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/*
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* Bug workaround - some TPM's don't flush the most
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* recently changed pcr on suspend, so force the flush
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* with an extend to the selected _unused_ non-volatile pcr.
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*/
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static u32 tpm_suspend_pcr;
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module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
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MODULE_PARM_DESC(suspend_pcr,
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"PCR to use for dummy writes to facilitate flush on suspend.");
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/**
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* tpm_calc_ordinal_duration() - calculate the maximum command duration
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* @chip: TPM chip to use.
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* @ordinal: TPM command ordinal.
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*
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* The function returns the maximum amount of time the chip could take
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* to return the result for a particular ordinal in jiffies.
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*
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* Return: A maximal duration time for an ordinal in jiffies.
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*/
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unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
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{
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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return tpm2_calc_ordinal_duration(chip, ordinal);
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else
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return tpm1_calc_ordinal_duration(chip, ordinal);
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}
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EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
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static ssize_t tpm_try_transmit(struct tpm_chip *chip, void *buf, size_t bufsiz)
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{
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struct tpm_header *header = buf;
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int rc;
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ssize_t len = 0;
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u32 count, ordinal;
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unsigned long stop;
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if (bufsiz < TPM_HEADER_SIZE)
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return -EINVAL;
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if (bufsiz > TPM_BUFSIZE)
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bufsiz = TPM_BUFSIZE;
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count = be32_to_cpu(header->length);
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ordinal = be32_to_cpu(header->ordinal);
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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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rc = chip->ops->send(chip, buf, count);
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if (rc < 0) {
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if (rc != -EPIPE)
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dev_err(&chip->dev,
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"%s: send(): error %d\n", __func__, rc);
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return rc;
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}
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/* A sanity check. send() should just return zero on success e.g.
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* not the command length.
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*/
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if (rc > 0) {
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dev_warn(&chip->dev,
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"%s: send(): invalid value %d\n", __func__, rc);
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rc = 0;
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}
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if (chip->flags & TPM_CHIP_FLAG_IRQ)
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goto out_recv;
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stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
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do {
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u8 status = chip->ops->status(chip);
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if ((status & chip->ops->req_complete_mask) ==
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chip->ops->req_complete_val)
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goto out_recv;
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if (chip->ops->req_canceled(chip, status)) {
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dev_err(&chip->dev, "Operation Canceled\n");
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return -ECANCELED;
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}
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tpm_msleep(TPM_TIMEOUT_POLL);
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rmb();
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} while (time_before(jiffies, stop));
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chip->ops->cancel(chip);
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dev_err(&chip->dev, "Operation Timed out\n");
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return -ETIME;
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out_recv:
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len = chip->ops->recv(chip, buf, bufsiz);
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if (len < 0) {
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rc = len;
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dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc);
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} else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
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rc = -EFAULT;
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return rc ? rc : len;
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}
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/**
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* tpm_transmit - Internal kernel interface to transmit TPM commands.
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* @chip: a TPM chip to use
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* @buf: a TPM command buffer
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* @bufsiz: length of the TPM command buffer
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*
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* A wrapper around tpm_try_transmit() that handles TPM2_RC_RETRY returns from
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* the TPM and retransmits the command after a delay up to a maximum wait of
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* TPM2_DURATION_LONG.
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*
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* Note that TPM 1.x never returns TPM2_RC_RETRY so the retry logic is TPM 2.0
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* only.
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*
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* Return:
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* * The response length - OK
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* * -errno - A system error
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*/
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ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz)
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{
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struct tpm_header *header = (struct tpm_header *)buf;
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/* space for header and handles */
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u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
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unsigned int delay_msec = TPM2_DURATION_SHORT;
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u32 rc = 0;
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ssize_t ret;
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const size_t save_size = min(sizeof(save), bufsiz);
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/* the command code is where the return code will be */
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u32 cc = be32_to_cpu(header->return_code);
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/*
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* Subtlety here: if we have a space, the handles will be
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* transformed, so when we restore the header we also have to
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* restore the handles.
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*/
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memcpy(save, buf, save_size);
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for (;;) {
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ret = tpm_try_transmit(chip, buf, bufsiz);
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if (ret < 0)
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break;
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rc = be32_to_cpu(header->return_code);
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if (rc != TPM2_RC_RETRY && rc != TPM2_RC_TESTING)
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break;
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/*
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* return immediately if self test returns test
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* still running to shorten boot time.
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*/
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if (rc == TPM2_RC_TESTING && cc == TPM2_CC_SELF_TEST)
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break;
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if (delay_msec > TPM2_DURATION_LONG) {
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if (rc == TPM2_RC_RETRY)
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dev_err(&chip->dev, "in retry loop\n");
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else
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dev_err(&chip->dev,
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"self test is still running\n");
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break;
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}
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tpm_msleep(delay_msec);
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delay_msec *= 2;
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memcpy(buf, save, save_size);
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}
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return ret;
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}
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/**
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* tpm_transmit_cmd - send a tpm command to the device
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* @chip: a TPM chip to use
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* @buf: a TPM command buffer
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* @min_rsp_body_length: minimum expected length of response body
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* @desc: command description used in the error message
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*
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* Return:
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* * 0 - OK
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* * -errno - A system error
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* * TPM_RC - A TPM error
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*/
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ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
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size_t min_rsp_body_length, const char *desc)
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{
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const struct tpm_header *header = (struct tpm_header *)buf->data;
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int err;
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ssize_t len;
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len = tpm_transmit(chip, buf->data, PAGE_SIZE);
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if (len < 0)
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return len;
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err = be32_to_cpu(header->return_code);
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if (err != 0 && err != TPM_ERR_DISABLED && err != TPM_ERR_DEACTIVATED
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&& err != TPM2_RC_TESTING && desc)
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dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err,
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desc);
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if (err)
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return err;
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if (len < min_rsp_body_length + TPM_HEADER_SIZE)
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return -EFAULT;
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return 0;
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}
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EXPORT_SYMBOL_GPL(tpm_transmit_cmd);
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int tpm_get_timeouts(struct tpm_chip *chip)
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{
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if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS)
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return 0;
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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return tpm2_get_timeouts(chip);
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else
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return tpm1_get_timeouts(chip);
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}
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EXPORT_SYMBOL_GPL(tpm_get_timeouts);
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/**
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* tpm_is_tpm2 - do we a have a TPM2 chip?
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* @chip: a &struct tpm_chip instance, %NULL for the default chip
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*
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* Return:
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* 1 if we have a TPM2 chip.
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* 0 if we don't have a TPM2 chip.
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* A negative number for system errors (errno).
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*/
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int tpm_is_tpm2(struct tpm_chip *chip)
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{
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int rc;
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chip = tpm_find_get_ops(chip);
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if (!chip)
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return -ENODEV;
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rc = (chip->flags & TPM_CHIP_FLAG_TPM2) != 0;
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tpm_put_ops(chip);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tpm_is_tpm2);
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/**
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* tpm_pcr_read - read a PCR value from SHA1 bank
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* @chip: a &struct tpm_chip instance, %NULL for the default chip
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* @pcr_idx: the PCR to be retrieved
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* @digest: the PCR bank and buffer current PCR value is written to
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*
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* Return: same as with tpm_transmit_cmd()
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*/
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int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
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struct tpm_digest *digest)
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{
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int rc;
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chip = tpm_find_get_ops(chip);
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if (!chip)
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return -ENODEV;
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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rc = tpm2_pcr_read(chip, pcr_idx, digest, NULL);
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else
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rc = tpm1_pcr_read(chip, pcr_idx, digest->digest);
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tpm_put_ops(chip);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tpm_pcr_read);
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/**
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* tpm_pcr_extend - extend a PCR value in SHA1 bank.
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* @chip: a &struct tpm_chip instance, %NULL for the default chip
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* @pcr_idx: the PCR to be retrieved
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* @digests: array of tpm_digest structures used to extend PCRs
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*
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* Note: callers must pass a digest for every allocated PCR bank, in the same
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* order of the banks in chip->allocated_banks.
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*
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* Return: same as with tpm_transmit_cmd()
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*/
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int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
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struct tpm_digest *digests)
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{
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int rc;
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int i;
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chip = tpm_find_get_ops(chip);
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if (!chip)
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return -ENODEV;
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for (i = 0; i < chip->nr_allocated_banks; i++) {
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if (digests[i].alg_id != chip->allocated_banks[i].alg_id) {
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rc = -EINVAL;
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goto out;
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}
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}
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if (chip->flags & TPM_CHIP_FLAG_TPM2) {
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rc = tpm2_pcr_extend(chip, pcr_idx, digests);
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goto out;
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}
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rc = tpm1_pcr_extend(chip, pcr_idx, digests[0].digest,
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"attempting extend a PCR value");
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out:
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tpm_put_ops(chip);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tpm_pcr_extend);
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/**
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* tpm_send - send a TPM command
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* @chip: a &struct tpm_chip instance, %NULL for the default chip
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* @cmd: a TPM command buffer
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* @buflen: the length of the TPM command buffer
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*
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* Return: same as with tpm_transmit_cmd()
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*/
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int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
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{
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struct tpm_buf buf;
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int rc;
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chip = tpm_find_get_ops(chip);
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if (!chip)
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return -ENODEV;
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buf.data = cmd;
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rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to a send a command");
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tpm_put_ops(chip);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tpm_send);
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int tpm_auto_startup(struct tpm_chip *chip)
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{
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int rc;
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if (!(chip->ops->flags & TPM_OPS_AUTO_STARTUP))
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return 0;
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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rc = tpm2_auto_startup(chip);
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else
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rc = tpm1_auto_startup(chip);
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return rc;
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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 device *dev)
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{
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struct tpm_chip *chip = dev_get_drvdata(dev);
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int rc = 0;
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if (!chip)
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return -ENODEV;
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if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
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goto suspended;
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if ((chip->flags & TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED) &&
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!pm_suspend_via_firmware())
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goto suspended;
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if (!tpm_chip_start(chip)) {
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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tpm2_shutdown(chip, TPM2_SU_STATE);
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else
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rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
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tpm_chip_stop(chip);
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}
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suspended:
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return rc;
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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 device *dev)
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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 -ENODEV;
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return 0;
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}
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EXPORT_SYMBOL_GPL(tpm_pm_resume);
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/**
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* tpm_get_random() - get random bytes from the TPM's RNG
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* @chip: a &struct tpm_chip instance, %NULL for the default chip
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* @out: destination buffer for the random bytes
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* @max: the max number of bytes to write to @out
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*
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* Return: number of random bytes read or a negative error value.
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*/
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int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max)
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{
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int rc;
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if (!out || max > TPM_MAX_RNG_DATA)
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return -EINVAL;
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chip = tpm_find_get_ops(chip);
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if (!chip)
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return -ENODEV;
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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rc = tpm2_get_random(chip, out, max);
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else
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rc = tpm1_get_random(chip, out, max);
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tpm_put_ops(chip);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tpm_get_random);
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static int __init tpm_init(void)
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{
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int rc;
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tpm_class = class_create(THIS_MODULE, "tpm");
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if (IS_ERR(tpm_class)) {
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pr_err("couldn't create tpm class\n");
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return PTR_ERR(tpm_class);
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}
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tpmrm_class = class_create(THIS_MODULE, "tpmrm");
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if (IS_ERR(tpmrm_class)) {
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pr_err("couldn't create tpmrm class\n");
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rc = PTR_ERR(tpmrm_class);
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goto out_destroy_tpm_class;
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}
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rc = alloc_chrdev_region(&tpm_devt, 0, 2*TPM_NUM_DEVICES, "tpm");
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if (rc < 0) {
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pr_err("tpm: failed to allocate char dev region\n");
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goto out_destroy_tpmrm_class;
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}
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rc = tpm_dev_common_init();
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if (rc) {
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pr_err("tpm: failed to allocate char dev region\n");
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goto out_unreg_chrdev;
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}
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return 0;
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out_unreg_chrdev:
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unregister_chrdev_region(tpm_devt, 2 * TPM_NUM_DEVICES);
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out_destroy_tpmrm_class:
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class_destroy(tpmrm_class);
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out_destroy_tpm_class:
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class_destroy(tpm_class);
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|
return rc;
|
|
}
|
|
|
|
static void __exit tpm_exit(void)
|
|
{
|
|
idr_destroy(&dev_nums_idr);
|
|
class_destroy(tpm_class);
|
|
class_destroy(tpmrm_class);
|
|
unregister_chrdev_region(tpm_devt, 2*TPM_NUM_DEVICES);
|
|
tpm_dev_common_exit();
|
|
}
|
|
|
|
subsys_initcall(tpm_init);
|
|
module_exit(tpm_exit);
|
|
|
|
MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
|
|
MODULE_DESCRIPTION("TPM Driver");
|
|
MODULE_VERSION("2.0");
|
|
MODULE_LICENSE("GPL");
|