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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | /* auth.c -- IOCTLs for authentication -*- linux-c -*- * Created: Tue Feb 2 08:37:54 1999 by faith@precisioninsight.com * Revised: Fri Aug 20 11:31:48 1999 by faith@precisioninsight.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * 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: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * 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 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/auth.c,v 1.4 1999/08/30 13:05:00 faith Exp $ * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/auth.c,v 1.1 1999/09/25 14:37:57 dawes Exp $ * */ #define __NO_VERSION__ #include "drmP.h" static int drm_hash_magic(drm_magic_t magic) { return magic & (DRM_HASH_SIZE-1); } static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic) { drm_file_t *retval = NULL; drm_magic_entry_t *pt; int hash = drm_hash_magic(magic); down(&dev->struct_sem); for (pt = dev->magiclist[hash].head; pt; pt = pt->next) { if (pt->priv->authenticated) continue; if (pt->magic == magic) { retval = pt->priv; break; } } up(&dev->struct_sem); return retval; } int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic) { int hash; drm_magic_entry_t *entry; DRM_DEBUG("%d\n", magic); hash = drm_hash_magic(magic); entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC); if (!entry) return -ENOMEM; entry->magic = magic; entry->priv = priv; entry->next = NULL; down(&dev->struct_sem); if (dev->magiclist[hash].tail) { dev->magiclist[hash].tail->next = entry; dev->magiclist[hash].tail = entry; } else { dev->magiclist[hash].head = entry; dev->magiclist[hash].tail = entry; } up(&dev->struct_sem); return 0; } int drm_remove_magic(drm_device_t *dev, drm_magic_t magic) { drm_magic_entry_t *prev = NULL; drm_magic_entry_t *pt; int hash; DRM_DEBUG("%d\n", magic); hash = drm_hash_magic(magic); down(&dev->struct_sem); for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) { if (pt->magic == magic) { if (dev->magiclist[hash].head == pt) { dev->magiclist[hash].head = pt->next; } if (dev->magiclist[hash].tail == pt) { dev->magiclist[hash].tail = prev; } if (prev) { prev->next = pt->next; } up(&dev->struct_sem); return 0; } } up(&dev->struct_sem); drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC); return -EINVAL; } int drm_getmagic(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { static drm_magic_t sequence = 0; static spinlock_t lock = SPIN_LOCK_UNLOCKED; drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->dev; drm_auth_t auth; /* Find unique magic */ if (priv->magic) { auth.magic = priv->magic; } else { spin_lock(&lock); do { if (!sequence) ++sequence; /* reserve 0 */ auth.magic = sequence++; } while (drm_find_file(dev, auth.magic)); spin_unlock(&lock); priv->magic = auth.magic; drm_add_magic(dev, priv, auth.magic); } DRM_DEBUG("%u\n", auth.magic); copy_to_user_ret((drm_auth_t *)arg, &auth, sizeof(auth), -EFAULT); return 0; } int drm_authmagic(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->dev; drm_auth_t auth; drm_file_t *file; copy_from_user_ret(&auth, (drm_auth_t *)arg, sizeof(auth), -EFAULT); DRM_DEBUG("%u\n", auth.magic); if ((file = drm_find_file(dev, auth.magic))) { file->authenticated = 1; drm_remove_magic(dev, auth.magic); return 0; } return -EINVAL; } |