752 строки
17 KiB
C
752 строки
17 KiB
C
/*
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* Copyright (C) 2015, 2016 IBM Corporation
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* Copyright (C) 2016 Intel Corporation
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*
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* Author: Stefan Berger <stefanb@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 vTPM (vTPM proxy driver)
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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/types.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/wait.h>
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#include <linux/miscdevice.h>
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#include <linux/vtpm_proxy.h>
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#include <linux/file.h>
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#include <linux/anon_inodes.h>
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#include <linux/poll.h>
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#include <linux/compat.h>
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#include "tpm.h"
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#define VTPM_PROXY_REQ_COMPLETE_FLAG BIT(0)
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struct proxy_dev {
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struct tpm_chip *chip;
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u32 flags; /* public API flags */
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wait_queue_head_t wq;
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struct mutex buf_lock; /* protect buffer and flags */
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long state; /* internal state */
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#define STATE_OPENED_FLAG BIT(0)
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#define STATE_WAIT_RESPONSE_FLAG BIT(1) /* waiting for emulator response */
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#define STATE_REGISTERED_FLAG BIT(2)
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#define STATE_DRIVER_COMMAND BIT(3) /* sending a driver specific command */
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size_t req_len; /* length of queued TPM request */
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size_t resp_len; /* length of queued TPM response */
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u8 buffer[TPM_BUFSIZE]; /* request/response buffer */
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struct work_struct work; /* task that retrieves TPM timeouts */
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};
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/* all supported flags */
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#define VTPM_PROXY_FLAGS_ALL (VTPM_PROXY_FLAG_TPM2)
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static struct workqueue_struct *workqueue;
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static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev);
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/*
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* Functions related to 'server side'
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*/
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/**
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* vtpm_proxy_fops_read - Read TPM commands on 'server side'
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*
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* @filp: file pointer
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* @buf: read buffer
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* @count: number of bytes to read
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* @off: offset
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*
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* Return:
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* Number of bytes read or negative error code
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*/
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static ssize_t vtpm_proxy_fops_read(struct file *filp, char __user *buf,
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size_t count, loff_t *off)
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{
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struct proxy_dev *proxy_dev = filp->private_data;
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size_t len;
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int sig, rc;
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sig = wait_event_interruptible(proxy_dev->wq,
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proxy_dev->req_len != 0 ||
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!(proxy_dev->state & STATE_OPENED_FLAG));
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if (sig)
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return -EINTR;
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mutex_lock(&proxy_dev->buf_lock);
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) {
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mutex_unlock(&proxy_dev->buf_lock);
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return -EPIPE;
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}
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len = proxy_dev->req_len;
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if (count < len) {
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mutex_unlock(&proxy_dev->buf_lock);
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pr_debug("Invalid size in recv: count=%zd, req_len=%zd\n",
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count, len);
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return -EIO;
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}
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rc = copy_to_user(buf, proxy_dev->buffer, len);
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memset(proxy_dev->buffer, 0, len);
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proxy_dev->req_len = 0;
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if (!rc)
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proxy_dev->state |= STATE_WAIT_RESPONSE_FLAG;
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mutex_unlock(&proxy_dev->buf_lock);
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if (rc)
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return -EFAULT;
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return len;
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}
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/**
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* vtpm_proxy_fops_write - Write TPM responses on 'server side'
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*
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* @filp: file pointer
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* @buf: write buffer
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* @count: number of bytes to write
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* @off: offset
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*
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* Return:
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* Number of bytes read or negative error value
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*/
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static ssize_t vtpm_proxy_fops_write(struct file *filp, const char __user *buf,
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size_t count, loff_t *off)
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{
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struct proxy_dev *proxy_dev = filp->private_data;
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mutex_lock(&proxy_dev->buf_lock);
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) {
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mutex_unlock(&proxy_dev->buf_lock);
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return -EPIPE;
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}
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if (count > sizeof(proxy_dev->buffer) ||
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!(proxy_dev->state & STATE_WAIT_RESPONSE_FLAG)) {
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mutex_unlock(&proxy_dev->buf_lock);
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return -EIO;
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}
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proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG;
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proxy_dev->req_len = 0;
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if (copy_from_user(proxy_dev->buffer, buf, count)) {
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mutex_unlock(&proxy_dev->buf_lock);
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return -EFAULT;
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}
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proxy_dev->resp_len = count;
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mutex_unlock(&proxy_dev->buf_lock);
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wake_up_interruptible(&proxy_dev->wq);
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return count;
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}
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/*
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* vtpm_proxy_fops_poll - Poll status on 'server side'
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*
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* @filp: file pointer
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* @wait: poll table
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*
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* Return: Poll flags
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*/
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static __poll_t vtpm_proxy_fops_poll(struct file *filp, poll_table *wait)
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{
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struct proxy_dev *proxy_dev = filp->private_data;
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__poll_t ret;
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poll_wait(filp, &proxy_dev->wq, wait);
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ret = EPOLLOUT;
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mutex_lock(&proxy_dev->buf_lock);
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if (proxy_dev->req_len)
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ret |= EPOLLIN | EPOLLRDNORM;
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if (!(proxy_dev->state & STATE_OPENED_FLAG))
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ret |= EPOLLHUP;
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mutex_unlock(&proxy_dev->buf_lock);
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return ret;
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}
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/*
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* vtpm_proxy_fops_open - Open vTPM device on 'server side'
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*
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* @filp: file pointer
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*
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* Called when setting up the anonymous file descriptor
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*/
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static void vtpm_proxy_fops_open(struct file *filp)
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{
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struct proxy_dev *proxy_dev = filp->private_data;
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proxy_dev->state |= STATE_OPENED_FLAG;
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}
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/**
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* vtpm_proxy_fops_undo_open - counter-part to vtpm_fops_open
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* Call to undo vtpm_proxy_fops_open
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*
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*@proxy_dev: tpm proxy device
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*/
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static void vtpm_proxy_fops_undo_open(struct proxy_dev *proxy_dev)
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{
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mutex_lock(&proxy_dev->buf_lock);
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proxy_dev->state &= ~STATE_OPENED_FLAG;
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mutex_unlock(&proxy_dev->buf_lock);
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/* no more TPM responses -- wake up anyone waiting for them */
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wake_up_interruptible(&proxy_dev->wq);
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}
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/*
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* vtpm_proxy_fops_release - Close 'server side'
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*
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* @inode: inode
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* @filp: file pointer
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* Return:
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* Always returns 0.
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*/
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static int vtpm_proxy_fops_release(struct inode *inode, struct file *filp)
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{
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struct proxy_dev *proxy_dev = filp->private_data;
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filp->private_data = NULL;
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vtpm_proxy_delete_device(proxy_dev);
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return 0;
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}
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static const struct file_operations vtpm_proxy_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.read = vtpm_proxy_fops_read,
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.write = vtpm_proxy_fops_write,
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.poll = vtpm_proxy_fops_poll,
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.release = vtpm_proxy_fops_release,
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};
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/*
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* Functions invoked by the core TPM driver to send TPM commands to
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* 'server side' and receive responses from there.
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*/
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/*
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* Called when core TPM driver reads TPM responses from 'server side'
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*
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* @chip: tpm chip to use
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* @buf: receive buffer
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* @count: bytes to read
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* Return:
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* Number of TPM response bytes read, negative error value otherwise
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*/
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static int vtpm_proxy_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
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size_t len;
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/* process gone ? */
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mutex_lock(&proxy_dev->buf_lock);
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) {
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mutex_unlock(&proxy_dev->buf_lock);
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return -EPIPE;
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}
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len = proxy_dev->resp_len;
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if (count < len) {
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dev_err(&chip->dev,
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"Invalid size in recv: count=%zd, resp_len=%zd\n",
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count, len);
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len = -EIO;
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goto out;
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}
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memcpy(buf, proxy_dev->buffer, len);
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proxy_dev->resp_len = 0;
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out:
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mutex_unlock(&proxy_dev->buf_lock);
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return len;
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}
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static int vtpm_proxy_is_driver_command(struct tpm_chip *chip,
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u8 *buf, size_t count)
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{
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struct tpm_input_header *hdr = (struct tpm_input_header *)buf;
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if (count < sizeof(struct tpm_input_header))
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return 0;
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if (chip->flags & TPM_CHIP_FLAG_TPM2) {
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switch (be32_to_cpu(hdr->ordinal)) {
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case TPM2_CC_SET_LOCALITY:
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return 1;
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}
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} else {
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switch (be32_to_cpu(hdr->ordinal)) {
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case TPM_ORD_SET_LOCALITY:
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return 1;
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}
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}
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return 0;
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}
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/*
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* Called when core TPM driver forwards TPM requests to 'server side'.
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*
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* @chip: tpm chip to use
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* @buf: send buffer
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* @count: bytes to send
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*
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* Return:
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* 0 in case of success, negative error value otherwise.
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*/
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static int vtpm_proxy_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
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int rc = 0;
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if (count > sizeof(proxy_dev->buffer)) {
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dev_err(&chip->dev,
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"Invalid size in send: count=%zd, buffer size=%zd\n",
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count, sizeof(proxy_dev->buffer));
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return -EIO;
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}
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if (!(proxy_dev->state & STATE_DRIVER_COMMAND) &&
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vtpm_proxy_is_driver_command(chip, buf, count))
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return -EFAULT;
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mutex_lock(&proxy_dev->buf_lock);
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) {
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mutex_unlock(&proxy_dev->buf_lock);
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return -EPIPE;
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}
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proxy_dev->resp_len = 0;
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proxy_dev->req_len = count;
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memcpy(proxy_dev->buffer, buf, count);
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proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG;
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mutex_unlock(&proxy_dev->buf_lock);
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wake_up_interruptible(&proxy_dev->wq);
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return rc;
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}
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static void vtpm_proxy_tpm_op_cancel(struct tpm_chip *chip)
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{
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/* not supported */
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}
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static u8 vtpm_proxy_tpm_op_status(struct tpm_chip *chip)
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{
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
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if (proxy_dev->resp_len)
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return VTPM_PROXY_REQ_COMPLETE_FLAG;
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return 0;
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}
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static bool vtpm_proxy_tpm_req_canceled(struct tpm_chip *chip, u8 status)
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{
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
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bool ret;
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mutex_lock(&proxy_dev->buf_lock);
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ret = !(proxy_dev->state & STATE_OPENED_FLAG);
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mutex_unlock(&proxy_dev->buf_lock);
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return ret;
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}
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static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)
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{
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struct tpm_buf buf;
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int rc;
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const struct tpm_output_header *header;
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS,
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TPM2_CC_SET_LOCALITY);
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else
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND,
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TPM_ORD_SET_LOCALITY);
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if (rc)
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return rc;
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tpm_buf_append_u8(&buf, locality);
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proxy_dev->state |= STATE_DRIVER_COMMAND;
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rc = tpm_transmit_cmd(chip, NULL, buf.data, tpm_buf_length(&buf), 0,
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TPM_TRANSMIT_UNLOCKED | TPM_TRANSMIT_RAW,
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"attempting to set locality");
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proxy_dev->state &= ~STATE_DRIVER_COMMAND;
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if (rc < 0) {
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locality = rc;
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goto out;
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}
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header = (const struct tpm_output_header *)buf.data;
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rc = be32_to_cpu(header->return_code);
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if (rc)
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locality = -1;
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out:
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tpm_buf_destroy(&buf);
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return locality;
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}
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static const struct tpm_class_ops vtpm_proxy_tpm_ops = {
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.flags = TPM_OPS_AUTO_STARTUP,
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.recv = vtpm_proxy_tpm_op_recv,
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.send = vtpm_proxy_tpm_op_send,
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.cancel = vtpm_proxy_tpm_op_cancel,
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.status = vtpm_proxy_tpm_op_status,
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.req_complete_mask = VTPM_PROXY_REQ_COMPLETE_FLAG,
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.req_complete_val = VTPM_PROXY_REQ_COMPLETE_FLAG,
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.req_canceled = vtpm_proxy_tpm_req_canceled,
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.request_locality = vtpm_proxy_request_locality,
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};
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/*
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* Code related to the startup of the TPM 2 and startup of TPM 1.2 +
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* retrieval of timeouts and durations.
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*/
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static void vtpm_proxy_work(struct work_struct *work)
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{
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struct proxy_dev *proxy_dev = container_of(work, struct proxy_dev,
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work);
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int rc;
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rc = tpm_chip_register(proxy_dev->chip);
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if (rc)
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vtpm_proxy_fops_undo_open(proxy_dev);
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else
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proxy_dev->state |= STATE_REGISTERED_FLAG;
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}
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/*
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* vtpm_proxy_work_stop: make sure the work has finished
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*
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* This function is useful when user space closed the fd
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* while the driver still determines timeouts.
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*/
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static void vtpm_proxy_work_stop(struct proxy_dev *proxy_dev)
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{
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vtpm_proxy_fops_undo_open(proxy_dev);
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flush_work(&proxy_dev->work);
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}
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/*
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* vtpm_proxy_work_start: Schedule the work for TPM 1.2 & 2 initialization
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*/
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static inline void vtpm_proxy_work_start(struct proxy_dev *proxy_dev)
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{
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queue_work(workqueue, &proxy_dev->work);
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}
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/*
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* Code related to creation and deletion of device pairs
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*/
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static struct proxy_dev *vtpm_proxy_create_proxy_dev(void)
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{
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struct proxy_dev *proxy_dev;
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struct tpm_chip *chip;
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int err;
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proxy_dev = kzalloc(sizeof(*proxy_dev), GFP_KERNEL);
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if (proxy_dev == NULL)
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return ERR_PTR(-ENOMEM);
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init_waitqueue_head(&proxy_dev->wq);
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mutex_init(&proxy_dev->buf_lock);
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INIT_WORK(&proxy_dev->work, vtpm_proxy_work);
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chip = tpm_chip_alloc(NULL, &vtpm_proxy_tpm_ops);
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if (IS_ERR(chip)) {
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err = PTR_ERR(chip);
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goto err_proxy_dev_free;
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}
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dev_set_drvdata(&chip->dev, proxy_dev);
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proxy_dev->chip = chip;
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return proxy_dev;
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err_proxy_dev_free:
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kfree(proxy_dev);
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return ERR_PTR(err);
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}
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/*
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* Undo what has been done in vtpm_create_proxy_dev
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*/
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static inline void vtpm_proxy_delete_proxy_dev(struct proxy_dev *proxy_dev)
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{
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put_device(&proxy_dev->chip->dev); /* frees chip */
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kfree(proxy_dev);
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}
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/*
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* Create a /dev/tpm%d and 'server side' file descriptor pair
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*
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* Return:
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* Returns file pointer on success, an error value otherwise
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*/
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static struct file *vtpm_proxy_create_device(
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struct vtpm_proxy_new_dev *vtpm_new_dev)
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{
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struct proxy_dev *proxy_dev;
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int rc, fd;
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struct file *file;
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|
|
if (vtpm_new_dev->flags & ~VTPM_PROXY_FLAGS_ALL)
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
|
|
proxy_dev = vtpm_proxy_create_proxy_dev();
|
|
if (IS_ERR(proxy_dev))
|
|
return ERR_CAST(proxy_dev);
|
|
|
|
proxy_dev->flags = vtpm_new_dev->flags;
|
|
|
|
/* setup an anonymous file for the server-side */
|
|
fd = get_unused_fd_flags(O_RDWR);
|
|
if (fd < 0) {
|
|
rc = fd;
|
|
goto err_delete_proxy_dev;
|
|
}
|
|
|
|
file = anon_inode_getfile("[vtpms]", &vtpm_proxy_fops, proxy_dev,
|
|
O_RDWR);
|
|
if (IS_ERR(file)) {
|
|
rc = PTR_ERR(file);
|
|
goto err_put_unused_fd;
|
|
}
|
|
|
|
/* from now on we can unwind with put_unused_fd() + fput() */
|
|
/* simulate an open() on the server side */
|
|
vtpm_proxy_fops_open(file);
|
|
|
|
if (proxy_dev->flags & VTPM_PROXY_FLAG_TPM2)
|
|
proxy_dev->chip->flags |= TPM_CHIP_FLAG_TPM2;
|
|
|
|
vtpm_proxy_work_start(proxy_dev);
|
|
|
|
vtpm_new_dev->fd = fd;
|
|
vtpm_new_dev->major = MAJOR(proxy_dev->chip->dev.devt);
|
|
vtpm_new_dev->minor = MINOR(proxy_dev->chip->dev.devt);
|
|
vtpm_new_dev->tpm_num = proxy_dev->chip->dev_num;
|
|
|
|
return file;
|
|
|
|
err_put_unused_fd:
|
|
put_unused_fd(fd);
|
|
|
|
err_delete_proxy_dev:
|
|
vtpm_proxy_delete_proxy_dev(proxy_dev);
|
|
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
/*
|
|
* Counter part to vtpm_create_device.
|
|
*/
|
|
static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev)
|
|
{
|
|
vtpm_proxy_work_stop(proxy_dev);
|
|
|
|
/*
|
|
* A client may hold the 'ops' lock, so let it know that the server
|
|
* side shuts down before we try to grab the 'ops' lock when
|
|
* unregistering the chip.
|
|
*/
|
|
vtpm_proxy_fops_undo_open(proxy_dev);
|
|
|
|
if (proxy_dev->state & STATE_REGISTERED_FLAG)
|
|
tpm_chip_unregister(proxy_dev->chip);
|
|
|
|
vtpm_proxy_delete_proxy_dev(proxy_dev);
|
|
}
|
|
|
|
/*
|
|
* Code related to the control device /dev/vtpmx
|
|
*/
|
|
|
|
/**
|
|
* vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl
|
|
* @file: /dev/vtpmx
|
|
* @ioctl: the ioctl number
|
|
* @arg: pointer to the struct vtpmx_proxy_new_dev
|
|
*
|
|
* Creates an anonymous file that is used by the process acting as a TPM to
|
|
* communicate with the client processes. The function will also add a new TPM
|
|
* device through which data is proxied to this TPM acting process. The caller
|
|
* will be provided with a file descriptor to communicate with the clients and
|
|
* major and minor numbers for the TPM device.
|
|
*/
|
|
static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl,
|
|
unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
|
|
struct vtpm_proxy_new_dev vtpm_new_dev;
|
|
struct file *vtpm_file;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
vtpm_new_dev_p = argp;
|
|
|
|
if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p,
|
|
sizeof(vtpm_new_dev)))
|
|
return -EFAULT;
|
|
|
|
vtpm_file = vtpm_proxy_create_device(&vtpm_new_dev);
|
|
if (IS_ERR(vtpm_file))
|
|
return PTR_ERR(vtpm_file);
|
|
|
|
if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev,
|
|
sizeof(vtpm_new_dev))) {
|
|
put_unused_fd(vtpm_new_dev.fd);
|
|
fput(vtpm_file);
|
|
return -EFAULT;
|
|
}
|
|
|
|
fd_install(vtpm_new_dev.fd, vtpm_file);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* vtpmx_fops_ioctl: ioctl on /dev/vtpmx
|
|
*
|
|
* Return:
|
|
* Returns 0 on success, a negative error code otherwise.
|
|
*/
|
|
static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl,
|
|
unsigned long arg)
|
|
{
|
|
switch (ioctl) {
|
|
case VTPM_PROXY_IOC_NEW_DEV:
|
|
return vtpmx_ioc_new_dev(f, ioctl, arg);
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long vtpmx_fops_compat_ioctl(struct file *f, unsigned int ioctl,
|
|
unsigned long arg)
|
|
{
|
|
return vtpmx_fops_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations vtpmx_fops = {
|
|
.owner = THIS_MODULE,
|
|
.unlocked_ioctl = vtpmx_fops_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = vtpmx_fops_compat_ioctl,
|
|
#endif
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static struct miscdevice vtpmx_miscdev = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = "vtpmx",
|
|
.fops = &vtpmx_fops,
|
|
};
|
|
|
|
static int vtpmx_init(void)
|
|
{
|
|
return misc_register(&vtpmx_miscdev);
|
|
}
|
|
|
|
static void vtpmx_cleanup(void)
|
|
{
|
|
misc_deregister(&vtpmx_miscdev);
|
|
}
|
|
|
|
static int __init vtpm_module_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = vtpmx_init();
|
|
if (rc) {
|
|
pr_err("couldn't create vtpmx device\n");
|
|
return rc;
|
|
}
|
|
|
|
workqueue = create_workqueue("tpm-vtpm");
|
|
if (!workqueue) {
|
|
pr_err("couldn't create workqueue\n");
|
|
rc = -ENOMEM;
|
|
goto err_vtpmx_cleanup;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_vtpmx_cleanup:
|
|
vtpmx_cleanup();
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void __exit vtpm_module_exit(void)
|
|
{
|
|
destroy_workqueue(workqueue);
|
|
vtpmx_cleanup();
|
|
}
|
|
|
|
module_init(vtpm_module_init);
|
|
module_exit(vtpm_module_exit);
|
|
|
|
MODULE_AUTHOR("Stefan Berger (stefanb@us.ibm.com)");
|
|
MODULE_DESCRIPTION("vTPM Driver");
|
|
MODULE_VERSION("0.1");
|
|
MODULE_LICENSE("GPL");
|