linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

/*

 * vboxguest linux pci driver, char-dev and input-device code,

 *

 * Copyright (C) 2006-2016 Oracle Corporation

 */

​

#include <linux/cred.h>

#include <linux/input.h>

#include <linux/kernel.h>

#include <linux/miscdevice.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/poll.h>

#include <linux/vbox_utils.h>

#include "vboxguest_core.h"

​

/** The device name. */

#define DEVICE_NAME     "vboxguest"

/** The device name for the device node open to everyone. */

#define DEVICE_NAME_USER    "vboxuser"

/** VirtualBox PCI vendor ID. */

#define VBOX_VENDORID       0x80ee

/** VMMDev PCI card product ID. */

#define VMMDEV_DEVICEID     0xcafe

​

/** Mutex protecting the global vbg_gdev pointer used by vbg_get/put_gdev. */

static DEFINE_MUTEX(vbg_gdev_mutex);

/** Global vbg_gdev pointer used by vbg_get/put_gdev. */

static struct vbg_dev *vbg_gdev;

​

static u32 vbg_misc_device_requestor(struct inode *inode)

{

    u32 requestor = VMMDEV_REQUESTOR_USERMODE |

            VMMDEV_REQUESTOR_CON_DONT_KNOW |

            VMMDEV_REQUESTOR_TRUST_NOT_GIVEN;

​

    if (from_kuid(current_user_ns(), current->cred->uid) == 0)

        requestor |= VMMDEV_REQUESTOR_USR_ROOT;

    else

        requestor |= VMMDEV_REQUESTOR_USR_USER;

​

    if (in_egroup_p(inode->i_gid))

        requestor |= VMMDEV_REQUESTOR_GRP_VBOX;

​

    return requestor;

}

​

static int vbg_misc_device_open(struct inode *inode, struct file *filp)

{

    struct vbg_session *session;

    struct vbg_dev *gdev;

​

    /* misc_open sets filp->private_data to our misc device */

    gdev = container_of(filp->private_data, struct vbg_dev, misc_device);

​

    session = vbg_core_open_session(gdev, vbg_misc_device_requestor(inode));

    if (IS_ERR(session))

        return PTR_ERR(session);

​

    filp->private_data = session;

    return 0;

}