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![Kees Cook](/assets/img/avatar_default.png)
When building with -Warray-bounds under GCC 11.2, this warning was emitted: In function 'memset', inlined from 'vtpm_proxy_fops_read' at drivers/char/tpm/tpm_vtpm_proxy.c:102:2: ./include/linux/fortify-string.h:43:33: warning: '__builtin_memset' pointer overflow between offset 164 and size [2147483648, 4294967295] [-Warray-bounds] 43 | #define __underlying_memset __builtin_memset | ^ This warning appears to be triggered due to the "count < len" check in vtpm_proxy_fops_read() splitting the CFG[1], and the compiler attempting to reason about the possible value range in len compared to the buffer size. In order to silence this warning, and to keep this code robust if the use of proxy_dev->req_len ever changes in the future, explicitly check the size of len before reaching the memset(). [1] https://lore.kernel.org/lkml/CAG48ez1iTF9KegKJrW5a3WzXgCPZJ73nS2_e5esKJRppdzvv8g@mail.gmail.com Cc: Peter Huewe <peterhuewe@gmx.de> Cc: Jarkko Sakkinen <jarkko@kernel.org> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: linux-integrity@vger.kernel.org Reviewed-by: Stefan Berger <stefanb@linux.ibm.com> Link: https://lore.kernel.org/lkml/4b59d305-6858-1514-751a-37853ad777be@linux.ibm.com Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220119184354.3367603-1-keescook@chromium.org
733 lines
16 KiB
C
733 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 || len > sizeof(proxy_dev->buffer)) {
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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_header *hdr = (struct tpm_header *)buf;
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if (count < sizeof(struct tpm_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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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 0;
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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_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, &buf, 0, "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_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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/*
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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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|
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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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|
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err_proxy_dev_free:
|
|
kfree(proxy_dev);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/*
|
|
* Undo what has been done in vtpm_create_proxy_dev
|
|
*/
|
|
static inline void vtpm_proxy_delete_proxy_dev(struct proxy_dev *proxy_dev)
|
|
{
|
|
put_device(&proxy_dev->chip->dev); /* frees chip */
|
|
kfree(proxy_dev);
|
|
}
|
|
|
|
/*
|
|
* Create a /dev/tpm%d and 'server side' file descriptor pair
|
|
*
|
|
* Return:
|
|
* Returns file pointer on success, an error value otherwise
|
|
*/
|
|
static struct file *vtpm_proxy_create_device(
|
|
struct vtpm_proxy_new_dev *vtpm_new_dev)
|
|
{
|
|
struct proxy_dev *proxy_dev;
|
|
int rc, fd;
|
|
struct file *file;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
static const struct file_operations vtpmx_fops = {
|
|
.owner = THIS_MODULE,
|
|
.unlocked_ioctl = vtpmx_fops_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.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");
|