drm/linux-core/drm_auth.c

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/**
* \file drm_auth.c
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* IOCTLs for authentication
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
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* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
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*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
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*/
#include "drmP.h"
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/**
* Find the file with the given magic number.
*
* \param dev DRM device.
* \param magic magic number.
*
* Searches in drm_device::magiclist within all files with the same hash key
* the one with matching magic number, while holding the drm_device::struct_mutex
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* lock.
*/
static drm_file_t *drm_find_file(drm_device_t * dev, drm_magic_t magic)
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{
drm_file_t *retval = NULL;
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drm_magic_entry_t *pt;
drm_hash_item_t *hash;
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mutex_lock(&dev->struct_mutex);
if (!drm_ht_find_item(&dev->magiclist, (unsigned long) magic, &hash)) {
pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item);
retval = pt->priv;
}
mutex_unlock(&dev->struct_mutex);
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return retval;
}
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/**
* Adds a magic number.
*
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* \param dev DRM device.
* \param priv file private data.
* \param magic magic number.
*
* Creates a drm_magic_entry structure and appends to the linked list
* associated the magic number hash key in drm_device::magiclist, while holding
* the drm_device::struct_mutex lock.
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*/
static int drm_add_magic(drm_device_t *dev, drm_file_t *priv,
drm_magic_t magic)
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{
drm_magic_entry_t *entry;
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DRM_DEBUG("%d\n", magic);
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entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC);
if (!entry)
return -ENOMEM;
memset(entry, 0, sizeof(*entry));
entry->priv = priv;
entry->hash_item.key = (unsigned long) magic;
mutex_lock(&dev->struct_mutex);
drm_ht_insert_item(&dev->magiclist, &entry->hash_item);
list_add_tail(&entry->head, &dev->magicfree);
mutex_unlock(&dev->struct_mutex);
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return 0;
}
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/**
* Remove a magic number.
*
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* \param dev DRM device.
* \param magic magic number.
*
* Searches and unlinks the entry in drm_device::magiclist with the magic
* number hash key, while holding the drm_device::struct_mutex lock.
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*/
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static int drm_remove_magic(drm_device_t * dev, drm_magic_t magic)
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{
drm_magic_entry_t *pt;
drm_hash_item_t *hash;
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DRM_DEBUG("%d\n", magic);
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mutex_lock(&dev->struct_mutex);
if (drm_ht_find_item(&dev->magiclist, (unsigned long) magic, &hash)) {
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
}
pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item);
drm_ht_remove_item(&dev->magiclist, hash);
list_del(&pt->head);
mutex_unlock(&dev->struct_mutex);
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drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
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return 0;
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}
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/**
* Get a unique magic number (ioctl).
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a resulting drm_auth structure.
* \return zero on success, or a negative number on failure.
*
* If there is a magic number in drm_file::magic then use it, otherwise
* searches an unique non-zero magic number and add it associating it with \p
* filp.
*/
int drm_getmagic(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
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{
static drm_magic_t sequence = 0;
static DEFINE_SPINLOCK(lock);
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
drm_auth_t auth;
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/* Find unique magic */
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if (priv->magic) {
auth.magic = priv->magic;
} else {
do {
spin_lock(&lock);
if (!sequence)
++sequence; /* reserve 0 */
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auth.magic = sequence++;
spin_unlock(&lock);
} while (drm_find_file(dev, auth.magic));
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priv->magic = auth.magic;
drm_add_magic(dev, priv, auth.magic);
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}
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DRM_DEBUG("%u\n", auth.magic);
if (copy_to_user((drm_auth_t __user *) arg, &auth, sizeof(auth)))
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return -EFAULT;
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return 0;
}
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/**
* Authenticate with a magic.
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_auth structure.
* \return zero if authentication successed, or a negative number otherwise.
*
* Checks if \p filp is associated with the magic number passed in \arg.
*/
int drm_authmagic(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
drm_auth_t auth;
drm_file_t *file;
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if (copy_from_user(&auth, (drm_auth_t __user *) arg, sizeof(auth)))
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return -EFAULT;
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DRM_DEBUG("%u\n", auth.magic);
if ((file = drm_find_file(dev, auth.magic))) {
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file->authenticated = 1;
drm_remove_magic(dev, auth.magic);
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return 0;
}
return -EINVAL;
}