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1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_auth.c |
1da177e4 LT |
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 | ||
760285e7 | 36 | #include <drm/drmP.h> |
67d0ec4e | 37 | #include "drm_internal.h" |
1da177e4 | 38 | |
71d39483 | 39 | struct drm_magic_entry { |
71d39483 DH |
40 | struct drm_hash_item hash_item; |
41 | struct drm_file *priv; | |
42 | }; | |
43 | ||
1da177e4 LT |
44 | /** |
45 | * Find the file with the given magic number. | |
46 | * | |
47 | * \param dev DRM device. | |
48 | * \param magic magic number. | |
49 | * | |
50 | * Searches in drm_device::magiclist within all files with the same hash key | |
30e2fb18 | 51 | * the one with matching magic number, while holding the drm_device::struct_mutex |
1da177e4 LT |
52 | * lock. |
53 | */ | |
7c1c2871 | 54 | static struct drm_file *drm_find_file(struct drm_master *master, drm_magic_t magic) |
1da177e4 | 55 | { |
84b1fd10 | 56 | struct drm_file *retval = NULL; |
8fc2fdf4 | 57 | struct drm_magic_entry *pt; |
e0be428e | 58 | struct drm_hash_item *hash; |
7c1c2871 | 59 | struct drm_device *dev = master->minor->dev; |
1da177e4 | 60 | |
30e2fb18 | 61 | mutex_lock(&dev->struct_mutex); |
7c1c2871 | 62 | if (!drm_ht_find_item(&master->magiclist, (unsigned long)magic, &hash)) { |
8fc2fdf4 | 63 | pt = drm_hash_entry(hash, struct drm_magic_entry, hash_item); |
8669cbc5 | 64 | retval = pt->priv; |
1da177e4 | 65 | } |
30e2fb18 | 66 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
67 | return retval; |
68 | } | |
69 | ||
70 | /** | |
71 | * Adds a magic number. | |
b5e89ed5 | 72 | * |
1da177e4 LT |
73 | * \param dev DRM device. |
74 | * \param priv file private data. | |
75 | * \param magic magic number. | |
76 | * | |
77 | * Creates a drm_magic_entry structure and appends to the linked list | |
78 | * associated the magic number hash key in drm_device::magiclist, while holding | |
30e2fb18 | 79 | * the drm_device::struct_mutex lock. |
1da177e4 | 80 | */ |
7c1c2871 | 81 | static int drm_add_magic(struct drm_master *master, struct drm_file *priv, |
b5e89ed5 | 82 | drm_magic_t magic) |
1da177e4 | 83 | { |
8fc2fdf4 | 84 | struct drm_magic_entry *entry; |
7c1c2871 | 85 | struct drm_device *dev = master->minor->dev; |
1da177e4 LT |
86 | DRM_DEBUG("%d\n", magic); |
87 | ||
6ebc22e6 | 88 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
b5e89ed5 DA |
89 | if (!entry) |
90 | return -ENOMEM; | |
b5e89ed5 | 91 | entry->priv = priv; |
8669cbc5 | 92 | entry->hash_item.key = (unsigned long)magic; |
30e2fb18 | 93 | mutex_lock(&dev->struct_mutex); |
7c1c2871 | 94 | drm_ht_insert_item(&master->magiclist, &entry->hash_item); |
30e2fb18 | 95 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
96 | |
97 | return 0; | |
98 | } | |
99 | ||
100 | /** | |
101 | * Remove a magic number. | |
b5e89ed5 | 102 | * |
1da177e4 LT |
103 | * \param dev DRM device. |
104 | * \param magic magic number. | |
105 | * | |
106 | * Searches and unlinks the entry in drm_device::magiclist with the magic | |
30e2fb18 | 107 | * number hash key, while holding the drm_device::struct_mutex lock. |
1da177e4 | 108 | */ |
598781d7 | 109 | int drm_remove_magic(struct drm_master *master, drm_magic_t magic) |
1da177e4 | 110 | { |
8fc2fdf4 | 111 | struct drm_magic_entry *pt; |
e0be428e | 112 | struct drm_hash_item *hash; |
7c1c2871 | 113 | struct drm_device *dev = master->minor->dev; |
1da177e4 LT |
114 | |
115 | DRM_DEBUG("%d\n", magic); | |
1da177e4 | 116 | |
30e2fb18 | 117 | mutex_lock(&dev->struct_mutex); |
7c1c2871 | 118 | if (drm_ht_find_item(&master->magiclist, (unsigned long)magic, &hash)) { |
8669cbc5 TH |
119 | mutex_unlock(&dev->struct_mutex); |
120 | return -EINVAL; | |
1da177e4 | 121 | } |
8fc2fdf4 | 122 | pt = drm_hash_entry(hash, struct drm_magic_entry, hash_item); |
7c1c2871 | 123 | drm_ht_remove_item(&master->magiclist, hash); |
30e2fb18 | 124 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 125 | |
9a298b2a | 126 | kfree(pt); |
1da177e4 | 127 | |
572225be | 128 | return 0; |
1da177e4 LT |
129 | } |
130 | ||
131 | /** | |
132 | * Get a unique magic number (ioctl). | |
133 | * | |
134 | * \param inode device inode. | |
6c340eac | 135 | * \param file_priv DRM file private. |
1da177e4 LT |
136 | * \param cmd command. |
137 | * \param arg pointer to a resulting drm_auth structure. | |
138 | * \return zero on success, or a negative number on failure. | |
139 | * | |
140 | * If there is a magic number in drm_file::magic then use it, otherwise | |
141 | * searches an unique non-zero magic number and add it associating it with \p | |
6c340eac | 142 | * file_priv. |
598781d7 TH |
143 | * This ioctl needs protection by the drm_global_mutex, which protects |
144 | * struct drm_file::magic and struct drm_magic_entry::priv. | |
1da177e4 | 145 | */ |
c153f45f | 146 | int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 LT |
147 | { |
148 | static drm_magic_t sequence = 0; | |
149 | static DEFINE_SPINLOCK(lock); | |
c153f45f | 150 | struct drm_auth *auth = data; |
1da177e4 | 151 | |
b5e89ed5 | 152 | /* Find unique magic */ |
6c340eac | 153 | if (file_priv->magic) { |
c153f45f | 154 | auth->magic = file_priv->magic; |
1da177e4 LT |
155 | } else { |
156 | do { | |
157 | spin_lock(&lock); | |
b5e89ed5 DA |
158 | if (!sequence) |
159 | ++sequence; /* reserve 0 */ | |
c153f45f | 160 | auth->magic = sequence++; |
1da177e4 | 161 | spin_unlock(&lock); |
7c1c2871 | 162 | } while (drm_find_file(file_priv->master, auth->magic)); |
c153f45f | 163 | file_priv->magic = auth->magic; |
7c1c2871 | 164 | drm_add_magic(file_priv->master, file_priv, auth->magic); |
1da177e4 LT |
165 | } |
166 | ||
c153f45f EA |
167 | DRM_DEBUG("%u\n", auth->magic); |
168 | ||
1da177e4 LT |
169 | return 0; |
170 | } | |
171 | ||
172 | /** | |
173 | * Authenticate with a magic. | |
174 | * | |
175 | * \param inode device inode. | |
6c340eac | 176 | * \param file_priv DRM file private. |
1da177e4 LT |
177 | * \param cmd command. |
178 | * \param arg pointer to a drm_auth structure. | |
179 | * \return zero if authentication successed, or a negative number otherwise. | |
180 | * | |
6c340eac | 181 | * Checks if \p file_priv is associated with the magic number passed in \arg. |
598781d7 TH |
182 | * This ioctl needs protection by the drm_global_mutex, which protects |
183 | * struct drm_file::magic and struct drm_magic_entry::priv. | |
1da177e4 | 184 | */ |
c153f45f EA |
185 | int drm_authmagic(struct drm_device *dev, void *data, |
186 | struct drm_file *file_priv) | |
1da177e4 | 187 | { |
c153f45f | 188 | struct drm_auth *auth = data; |
84b1fd10 | 189 | struct drm_file *file; |
1da177e4 | 190 | |
c153f45f | 191 | DRM_DEBUG("%u\n", auth->magic); |
7c1c2871 | 192 | if ((file = drm_find_file(file_priv->master, auth->magic))) { |
1da177e4 | 193 | file->authenticated = 1; |
7c1c2871 | 194 | drm_remove_magic(file_priv->master, auth->magic); |
1da177e4 LT |
195 | return 0; |
196 | } | |
197 | return -EINVAL; | |
198 | } |