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1 | /** | |
2 | * \file drm_auth.c | |
3 | * IOCTLs for authentication | |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
36 | #include "drmP.h" | |
37 | ||
38 | /** | |
39 | * Find the file with the given magic number. | |
40 | * | |
41 | * \param dev DRM device. | |
42 | * \param magic magic number. | |
43 | * | |
44 | * Searches in drm_device::magiclist within all files with the same hash key | |
45 | * the one with matching magic number, while holding the drm_device::struct_mutex | |
46 | * lock. | |
47 | */ | |
48 | static struct drm_file *drm_find_file(struct drm_device * dev, drm_magic_t magic) | |
49 | { | |
50 | struct drm_file *retval = NULL; | |
51 | drm_magic_entry_t *pt; | |
52 | drm_hash_item_t *hash; | |
53 | ||
54 | mutex_lock(&dev->struct_mutex); | |
55 | if (!drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) { | |
56 | pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item); | |
57 | retval = pt->priv; | |
58 | } | |
59 | mutex_unlock(&dev->struct_mutex); | |
60 | return retval; | |
61 | } | |
62 | ||
63 | /** | |
64 | * Adds a magic number. | |
65 | * | |
66 | * \param dev DRM device. | |
67 | * \param priv file private data. | |
68 | * \param magic magic number. | |
69 | * | |
70 | * Creates a drm_magic_entry structure and appends to the linked list | |
71 | * associated the magic number hash key in drm_device::magiclist, while holding | |
72 | * the drm_device::struct_mutex lock. | |
73 | */ | |
74 | static int drm_add_magic(struct drm_device * dev, struct drm_file * priv, | |
75 | drm_magic_t magic) | |
76 | { | |
77 | drm_magic_entry_t *entry; | |
78 | ||
79 | DRM_DEBUG("%d\n", magic); | |
80 | ||
81 | entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC); | |
82 | if (!entry) | |
83 | return -ENOMEM; | |
84 | memset(entry, 0, sizeof(*entry)); | |
85 | entry->priv = priv; | |
86 | ||
87 | entry->hash_item.key = (unsigned long)magic; | |
88 | mutex_lock(&dev->struct_mutex); | |
89 | drm_ht_insert_item(&dev->magiclist, &entry->hash_item); | |
90 | list_add_tail(&entry->head, &dev->magicfree); | |
91 | mutex_unlock(&dev->struct_mutex); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | /** | |
97 | * Remove a magic number. | |
98 | * | |
99 | * \param dev DRM device. | |
100 | * \param magic magic number. | |
101 | * | |
102 | * Searches and unlinks the entry in drm_device::magiclist with the magic | |
103 | * number hash key, while holding the drm_device::struct_mutex lock. | |
104 | */ | |
105 | static int drm_remove_magic(struct drm_device * dev, drm_magic_t magic) | |
106 | { | |
107 | drm_magic_entry_t *pt; | |
108 | drm_hash_item_t *hash; | |
109 | ||
110 | DRM_DEBUG("%d\n", magic); | |
111 | ||
112 | mutex_lock(&dev->struct_mutex); | |
113 | if (drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) { | |
114 | mutex_unlock(&dev->struct_mutex); | |
115 | return -EINVAL; | |
116 | } | |
117 | pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item); | |
118 | drm_ht_remove_item(&dev->magiclist, hash); | |
119 | list_del(&pt->head); | |
120 | mutex_unlock(&dev->struct_mutex); | |
121 | ||
122 | drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | /** | |
128 | * Get a unique magic number (ioctl). | |
129 | * | |
130 | * \param inode device inode. | |
131 | * \param filp file pointer. | |
132 | * \param cmd command. | |
133 | * \param arg pointer to a resulting drm_auth structure. | |
134 | * \return zero on success, or a negative number on failure. | |
135 | * | |
136 | * If there is a magic number in drm_file::magic then use it, otherwise | |
137 | * searches an unique non-zero magic number and add it associating it with \p | |
138 | * filp. | |
139 | */ | |
140 | int drm_getmagic(struct inode *inode, struct file *filp, | |
141 | unsigned int cmd, unsigned long arg) | |
142 | { | |
143 | static drm_magic_t sequence = 0; | |
144 | static DEFINE_SPINLOCK(lock); | |
145 | struct drm_file *priv = filp->private_data; | |
146 | struct drm_device *dev = priv->head->dev; | |
147 | struct drm_auth auth; | |
148 | ||
149 | /* Find unique magic */ | |
150 | if (priv->magic) { | |
151 | auth.magic = priv->magic; | |
152 | } else { | |
153 | do { | |
154 | spin_lock(&lock); | |
155 | if (!sequence) | |
156 | ++sequence; /* reserve 0 */ | |
157 | auth.magic = sequence++; | |
158 | spin_unlock(&lock); | |
159 | } while (drm_find_file(dev, auth.magic)); | |
160 | priv->magic = auth.magic; | |
161 | drm_add_magic(dev, priv, auth.magic); | |
162 | } | |
163 | ||
164 | DRM_DEBUG("%u\n", auth.magic); | |
165 | if (copy_to_user((struct drm_auth __user *) arg, &auth, sizeof(auth))) | |
166 | return -EFAULT; | |
167 | return 0; | |
168 | } | |
169 | ||
170 | /** | |
171 | * Authenticate with a magic. | |
172 | * | |
173 | * \param inode device inode. | |
174 | * \param filp file pointer. | |
175 | * \param cmd command. | |
176 | * \param arg pointer to a drm_auth structure. | |
177 | * \return zero if authentication successed, or a negative number otherwise. | |
178 | * | |
179 | * Checks if \p filp is associated with the magic number passed in \arg. | |
180 | */ | |
181 | int drm_authmagic(struct inode *inode, struct file *filp, | |
182 | unsigned int cmd, unsigned long arg) | |
183 | { | |
184 | struct drm_file *priv = filp->private_data; | |
185 | struct drm_device *dev = priv->head->dev; | |
186 | struct drm_auth auth; | |
187 | struct drm_file *file; | |
188 | ||
189 | if (copy_from_user(&auth, (struct drm_auth __user *) arg, sizeof(auth))) | |
190 | return -EFAULT; | |
191 | DRM_DEBUG("%u\n", auth.magic); | |
192 | if ((file = drm_find_file(dev, auth.magic))) { | |
193 | file->authenticated = 1; | |
194 | drm_remove_magic(dev, auth.magic); | |
195 | return 0; | |
196 | } | |
197 | return -EINVAL; | |
198 | } |