drm_auth.c revision 1.2.8.2
1 1.2.8.2 tls /** 2 1.2.8.2 tls * \file drm_auth.c 3 1.2.8.2 tls * IOCTLs for authentication 4 1.2.8.2 tls * 5 1.2.8.2 tls * \author Rickard E. (Rik) Faith <faith (at) valinux.com> 6 1.2.8.2 tls * \author Gareth Hughes <gareth (at) valinux.com> 7 1.2.8.2 tls */ 8 1.2.8.2 tls 9 1.2.8.2 tls /* 10 1.2.8.2 tls * Created: Tue Feb 2 08:37:54 1999 by faith (at) valinux.com 11 1.2.8.2 tls * 12 1.2.8.2 tls * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 13 1.2.8.2 tls * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 1.2.8.2 tls * All Rights Reserved. 15 1.2.8.2 tls * 16 1.2.8.2 tls * Permission is hereby granted, free of charge, to any person obtaining a 17 1.2.8.2 tls * copy of this software and associated documentation files (the "Software"), 18 1.2.8.2 tls * to deal in the Software without restriction, including without limitation 19 1.2.8.2 tls * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 1.2.8.2 tls * and/or sell copies of the Software, and to permit persons to whom the 21 1.2.8.2 tls * Software is furnished to do so, subject to the following conditions: 22 1.2.8.2 tls * 23 1.2.8.2 tls * The above copyright notice and this permission notice (including the next 24 1.2.8.2 tls * paragraph) shall be included in all copies or substantial portions of the 25 1.2.8.2 tls * Software. 26 1.2.8.2 tls * 27 1.2.8.2 tls * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 1.2.8.2 tls * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 1.2.8.2 tls * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 1.2.8.2 tls * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 1.2.8.2 tls * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 1.2.8.2 tls * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 1.2.8.2 tls * OTHER DEALINGS IN THE SOFTWARE. 34 1.2.8.2 tls */ 35 1.2.8.2 tls 36 1.2.8.2 tls #include <drm/drmP.h> 37 1.2.8.2 tls 38 1.2.8.2 tls /** 39 1.2.8.2 tls * Find the file with the given magic number. 40 1.2.8.2 tls * 41 1.2.8.2 tls * \param dev DRM device. 42 1.2.8.2 tls * \param magic magic number. 43 1.2.8.2 tls * 44 1.2.8.2 tls * Searches in drm_device::magiclist within all files with the same hash key 45 1.2.8.2 tls * the one with matching magic number, while holding the drm_device::struct_mutex 46 1.2.8.2 tls * lock. 47 1.2.8.2 tls */ 48 1.2.8.2 tls static struct drm_file *drm_find_file(struct drm_master *master, drm_magic_t magic) 49 1.2.8.2 tls { 50 1.2.8.2 tls struct drm_file *retval = NULL; 51 1.2.8.2 tls struct drm_magic_entry *pt; 52 1.2.8.2 tls struct drm_hash_item *hash; 53 1.2.8.2 tls struct drm_device *dev = master->minor->dev; 54 1.2.8.2 tls 55 1.2.8.2 tls mutex_lock(&dev->struct_mutex); 56 1.2.8.2 tls if (!drm_ht_find_item(&master->magiclist, (unsigned long)magic, &hash)) { 57 1.2.8.2 tls pt = drm_hash_entry(hash, struct drm_magic_entry, hash_item); 58 1.2.8.2 tls retval = pt->priv; 59 1.2.8.2 tls } 60 1.2.8.2 tls mutex_unlock(&dev->struct_mutex); 61 1.2.8.2 tls return retval; 62 1.2.8.2 tls } 63 1.2.8.2 tls 64 1.2.8.2 tls /** 65 1.2.8.2 tls * Adds a magic number. 66 1.2.8.2 tls * 67 1.2.8.2 tls * \param dev DRM device. 68 1.2.8.2 tls * \param priv file private data. 69 1.2.8.2 tls * \param magic magic number. 70 1.2.8.2 tls * 71 1.2.8.2 tls * Creates a drm_magic_entry structure and appends to the linked list 72 1.2.8.2 tls * associated the magic number hash key in drm_device::magiclist, while holding 73 1.2.8.2 tls * the drm_device::struct_mutex lock. 74 1.2.8.2 tls */ 75 1.2.8.2 tls static int drm_add_magic(struct drm_master *master, struct drm_file *priv, 76 1.2.8.2 tls drm_magic_t magic) 77 1.2.8.2 tls { 78 1.2.8.2 tls struct drm_magic_entry *entry; 79 1.2.8.2 tls struct drm_device *dev = master->minor->dev; 80 1.2.8.2 tls DRM_DEBUG("%d\n", magic); 81 1.2.8.2 tls 82 1.2.8.2 tls entry = kzalloc(sizeof(*entry), GFP_KERNEL); 83 1.2.8.2 tls if (!entry) 84 1.2.8.2 tls return -ENOMEM; 85 1.2.8.2 tls entry->priv = priv; 86 1.2.8.2 tls entry->hash_item.key = (unsigned long)magic; 87 1.2.8.2 tls mutex_lock(&dev->struct_mutex); 88 1.2.8.2 tls drm_ht_insert_item(&master->magiclist, &entry->hash_item); 89 1.2.8.2 tls list_add_tail(&entry->head, &master->magicfree); 90 1.2.8.2 tls mutex_unlock(&dev->struct_mutex); 91 1.2.8.2 tls 92 1.2.8.2 tls return 0; 93 1.2.8.2 tls } 94 1.2.8.2 tls 95 1.2.8.2 tls /** 96 1.2.8.2 tls * Remove a magic number. 97 1.2.8.2 tls * 98 1.2.8.2 tls * \param dev DRM device. 99 1.2.8.2 tls * \param magic magic number. 100 1.2.8.2 tls * 101 1.2.8.2 tls * Searches and unlinks the entry in drm_device::magiclist with the magic 102 1.2.8.2 tls * number hash key, while holding the drm_device::struct_mutex lock. 103 1.2.8.2 tls */ 104 1.2.8.2 tls int drm_remove_magic(struct drm_master *master, drm_magic_t magic) 105 1.2.8.2 tls { 106 1.2.8.2 tls struct drm_magic_entry *pt; 107 1.2.8.2 tls struct drm_hash_item *hash; 108 1.2.8.2 tls struct drm_device *dev = master->minor->dev; 109 1.2.8.2 tls 110 1.2.8.2 tls DRM_DEBUG("%d\n", magic); 111 1.2.8.2 tls 112 1.2.8.2 tls mutex_lock(&dev->struct_mutex); 113 1.2.8.2 tls if (drm_ht_find_item(&master->magiclist, (unsigned long)magic, &hash)) { 114 1.2.8.2 tls mutex_unlock(&dev->struct_mutex); 115 1.2.8.2 tls return -EINVAL; 116 1.2.8.2 tls } 117 1.2.8.2 tls pt = drm_hash_entry(hash, struct drm_magic_entry, hash_item); 118 1.2.8.2 tls drm_ht_remove_item(&master->magiclist, hash); 119 1.2.8.2 tls list_del(&pt->head); 120 1.2.8.2 tls mutex_unlock(&dev->struct_mutex); 121 1.2.8.2 tls 122 1.2.8.2 tls kfree(pt); 123 1.2.8.2 tls 124 1.2.8.2 tls return 0; 125 1.2.8.2 tls } 126 1.2.8.2 tls 127 1.2.8.2 tls /** 128 1.2.8.2 tls * Get a unique magic number (ioctl). 129 1.2.8.2 tls * 130 1.2.8.2 tls * \param inode device inode. 131 1.2.8.2 tls * \param file_priv DRM file private. 132 1.2.8.2 tls * \param cmd command. 133 1.2.8.2 tls * \param arg pointer to a resulting drm_auth structure. 134 1.2.8.2 tls * \return zero on success, or a negative number on failure. 135 1.2.8.2 tls * 136 1.2.8.2 tls * If there is a magic number in drm_file::magic then use it, otherwise 137 1.2.8.2 tls * searches an unique non-zero magic number and add it associating it with \p 138 1.2.8.2 tls * file_priv. 139 1.2.8.2 tls * This ioctl needs protection by the drm_global_mutex, which protects 140 1.2.8.2 tls * struct drm_file::magic and struct drm_magic_entry::priv. 141 1.2.8.2 tls */ 142 1.2.8.2 tls int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv) 143 1.2.8.2 tls { 144 1.2.8.2 tls static atomic_t sequence = ATOMIC_INIT(0); 145 1.2.8.2 tls struct drm_auth *auth = data; 146 1.2.8.2 tls 147 1.2.8.2 tls /* Find unique magic */ 148 1.2.8.2 tls if (file_priv->magic) { 149 1.2.8.2 tls auth->magic = file_priv->magic; 150 1.2.8.2 tls } else { 151 1.2.8.2 tls do { 152 1.2.8.2 tls auth->magic = atomic_inc_return(&sequence); 153 1.2.8.2 tls } while (drm_find_file(file_priv->master, auth->magic)); 154 1.2.8.2 tls file_priv->magic = auth->magic; 155 1.2.8.2 tls drm_add_magic(file_priv->master, file_priv, auth->magic); 156 1.2.8.2 tls } 157 1.2.8.2 tls 158 1.2.8.2 tls DRM_DEBUG("%u\n", auth->magic); 159 1.2.8.2 tls 160 1.2.8.2 tls return 0; 161 1.2.8.2 tls } 162 1.2.8.2 tls 163 1.2.8.2 tls /** 164 1.2.8.2 tls * Authenticate with a magic. 165 1.2.8.2 tls * 166 1.2.8.2 tls * \param inode device inode. 167 1.2.8.2 tls * \param file_priv DRM file private. 168 1.2.8.2 tls * \param cmd command. 169 1.2.8.2 tls * \param arg pointer to a drm_auth structure. 170 1.2.8.2 tls * \return zero if authentication successed, or a negative number otherwise. 171 1.2.8.2 tls * 172 1.2.8.2 tls * Checks if \p file_priv is associated with the magic number passed in \arg. 173 1.2.8.2 tls * This ioctl needs protection by the drm_global_mutex, which protects 174 1.2.8.2 tls * struct drm_file::magic and struct drm_magic_entry::priv. 175 1.2.8.2 tls */ 176 1.2.8.2 tls int drm_authmagic(struct drm_device *dev, void *data, 177 1.2.8.2 tls struct drm_file *file_priv) 178 1.2.8.2 tls { 179 1.2.8.2 tls struct drm_auth *auth = data; 180 1.2.8.2 tls struct drm_file *file; 181 1.2.8.2 tls 182 1.2.8.2 tls DRM_DEBUG("%u\n", auth->magic); 183 1.2.8.2 tls if ((file = drm_find_file(file_priv->master, auth->magic))) { 184 1.2.8.2 tls file->authenticated = 1; 185 1.2.8.2 tls drm_remove_magic(file_priv->master, auth->magic); 186 1.2.8.2 tls return 0; 187 1.2.8.2 tls } 188 1.2.8.2 tls return -EINVAL; 189 1.2.8.2 tls } 190
Indexes created Thu Oct 02 07:10:07 GMT 2025