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
162
163
164
165
166
167
168
169
170
171
|
/*-
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* 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
* VA LINUX SYSTEMS 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.
*
* Authors:
* Rickard E. (Rik) Faith <faith@valinux.com>
* Gareth Hughes <gareth@valinux.com>
*
*/
/** @file drm_auth.c
* Implementation of the get/authmagic ioctls implementing the authentication
* scheme between the master and clients.
*/
#include "drmP.h"
drm_file_t *drm_find_file(drm_device_t *, drm_magic_t);
int drm_add_magic(drm_device_t *, drm_file_t *, drm_magic_t);
int drm_remove_magic(drm_device_t *, drm_magic_t);
/**
* Returns the file private associated with the given magic number.
*/
drm_file_t *
drm_find_file(drm_device_t *dev, drm_magic_t magic)
{
struct drm_magic_entry *pt;
struct drm_magic_entry key;
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
key.magic = magic;
if ((pt = SPLAY_FIND(drm_magic_tree, &dev->magiclist, &key)) != NULL)
return (pt->priv);
return (NULL);
}
/**
* Inserts the given magic number into the hash table of used magic number
* lists.
*/
int
drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
{
struct drm_magic_entry *entry;
DRM_DEBUG("%d\n", magic);
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
if ((entry = malloc(sizeof(*entry), M_DRM, M_ZERO | M_NOWAIT)) == NULL)
return (ENOMEM);
entry->magic = magic;
entry->priv = priv;
SPLAY_INSERT(drm_magic_tree, &dev->magiclist, entry);
return (0);
}
/**
* Removes the given magic number from the hash table of used magic number
* lists.
*/
int
drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
{
struct drm_magic_entry *pt;
struct drm_magic_entry key;
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
DRM_DEBUG("%d\n", magic);
key.magic = magic;
if ((pt = SPLAY_FIND(drm_magic_tree, &dev->magiclist, &key)) == NULL)
return (EINVAL);
SPLAY_REMOVE(drm_magic_tree, &dev->magiclist, pt);
free(pt, M_DRM);
return (0);
}
/**
* Called by the client, this returns a unique magic number to be authorized
* by the master.
*
* The master may use its own knowledge of the client (such as the X
* connection that the magic is passed over) to determine if the magic number
* should be authenticated.
*/
int
drm_getmagic(drm_device_t *dev, void *data, struct drm_file *file_priv)
{
static drm_magic_t sequence = 0;
drm_auth_t *auth = data;
/* Find unique magic */
if (file_priv->magic) {
auth->magic = file_priv->magic;
} else {
DRM_LOCK();
do {
int old = sequence;
auth->magic = ++old;
if (!atomic_cmpset_int(&sequence, old, auth->magic))
continue;
} while (drm_find_file(dev, auth->magic));
file_priv->magic = auth->magic;
drm_add_magic(dev, file_priv, auth->magic);
DRM_UNLOCK();
}
DRM_DEBUG("%u\n", auth->magic);
return (0);
}
/**
* Marks the client associated with the given magic number as authenticated.
*/
int
drm_authmagic(drm_device_t *dev, void *data, struct drm_file *file_priv)
{
drm_auth_t *auth = data;
drm_file_t *priv;
DRM_DEBUG("%u\n", auth->magic);
DRM_LOCK();
priv = drm_find_file(dev, auth->magic);
if (priv != NULL) {
priv->authenticated = 1;
drm_remove_magic(dev, auth->magic);
DRM_UNLOCK();
return (0);
} else {
DRM_UNLOCK();
return (EINVAL);
}
}
int
drm_magic_cmp(struct drm_magic_entry *dme1, struct drm_magic_entry *dme2)
{
return (dme1->magic - dme2->magic);
}
SPLAY_GENERATE(drm_magic_tree, drm_magic_entry, node, drm_magic_cmp);
|
