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12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/sched.h>
15#include <linux/fs.h>
16#include <linux/proc_fs.h>
17#include <linux/seq_file.h>
18#include <asm/errno.h>
19#include "internal.h"
20
21#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
22static int proc_keys_open(struct inode *inode, struct file *file);
23static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
24static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
25static void proc_keys_stop(struct seq_file *p, void *v);
26static int proc_keys_show(struct seq_file *m, void *v);
27
28static const struct seq_operations proc_keys_ops = {
29 .start = proc_keys_start,
30 .next = proc_keys_next,
31 .stop = proc_keys_stop,
32 .show = proc_keys_show,
33};
34
35static const struct file_operations proc_keys_fops = {
36 .open = proc_keys_open,
37 .read = seq_read,
38 .llseek = seq_lseek,
39 .release = seq_release,
40};
41#endif
42
43static int proc_key_users_open(struct inode *inode, struct file *file);
44static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
45static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
46static void proc_key_users_stop(struct seq_file *p, void *v);
47static int proc_key_users_show(struct seq_file *m, void *v);
48
49static const struct seq_operations proc_key_users_ops = {
50 .start = proc_key_users_start,
51 .next = proc_key_users_next,
52 .stop = proc_key_users_stop,
53 .show = proc_key_users_show,
54};
55
56static const struct file_operations proc_key_users_fops = {
57 .open = proc_key_users_open,
58 .read = seq_read,
59 .llseek = seq_lseek,
60 .release = seq_release,
61};
62
63
64
65
66
67static int __init key_proc_init(void)
68{
69 struct proc_dir_entry *p;
70
71#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
72 p = proc_create("keys", 0, NULL, &proc_keys_fops);
73 if (!p)
74 panic("Cannot create /proc/keys\n");
75#endif
76
77 p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
78 if (!p)
79 panic("Cannot create /proc/key-users\n");
80
81 return 0;
82
83}
84
85__initcall(key_proc_init);
86
87
88
89
90
91#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
92
93static struct rb_node *key_serial_next(struct rb_node *n)
94{
95 struct user_namespace *user_ns = current_user_ns();
96
97 n = rb_next(n);
98 while (n) {
99 struct key *key = rb_entry(n, struct key, serial_node);
100 if (key->user->user_ns == user_ns)
101 break;
102 n = rb_next(n);
103 }
104 return n;
105}
106
107static int proc_keys_open(struct inode *inode, struct file *file)
108{
109 return seq_open(file, &proc_keys_ops);
110}
111
112static struct key *find_ge_key(key_serial_t id)
113{
114 struct user_namespace *user_ns = current_user_ns();
115 struct rb_node *n = key_serial_tree.rb_node;
116 struct key *minkey = NULL;
117
118 while (n) {
119 struct key *key = rb_entry(n, struct key, serial_node);
120 if (id < key->serial) {
121 if (!minkey || minkey->serial > key->serial)
122 minkey = key;
123 n = n->rb_left;
124 } else if (id > key->serial) {
125 n = n->rb_right;
126 } else {
127 minkey = key;
128 break;
129 }
130 key = NULL;
131 }
132
133 if (!minkey)
134 return NULL;
135
136 for (;;) {
137 if (minkey->user->user_ns == user_ns)
138 return minkey;
139 n = rb_next(&minkey->serial_node);
140 if (!n)
141 return NULL;
142 minkey = rb_entry(n, struct key, serial_node);
143 }
144}
145
146static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
147 __acquires(key_serial_lock)
148{
149 key_serial_t pos = *_pos;
150 struct key *key;
151
152 spin_lock(&key_serial_lock);
153
154 if (*_pos > INT_MAX)
155 return NULL;
156 key = find_ge_key(pos);
157 if (!key)
158 return NULL;
159 *_pos = key->serial;
160 return &key->serial_node;
161}
162
163static inline key_serial_t key_node_serial(struct rb_node *n)
164{
165 struct key *key = rb_entry(n, struct key, serial_node);
166 return key->serial;
167}
168
169static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
170{
171 struct rb_node *n;
172
173 n = key_serial_next(v);
174 if (n)
175 *_pos = key_node_serial(n);
176 return n;
177}
178
179static void proc_keys_stop(struct seq_file *p, void *v)
180 __releases(key_serial_lock)
181{
182 spin_unlock(&key_serial_lock);
183}
184
185static int proc_keys_show(struct seq_file *m, void *v)
186{
187 struct rb_node *_p = v;
188 struct key *key = rb_entry(_p, struct key, serial_node);
189 struct timespec now;
190 unsigned long timo;
191 char xbuf[12];
192 int rc;
193
194
195
196
197
198
199 rc = key_task_permission(make_key_ref(key, 0), current_cred(),
200 KEY_VIEW);
201 if (rc < 0)
202 return 0;
203
204 now = current_kernel_time();
205
206 rcu_read_lock();
207
208
209 if (key->expiry == 0) {
210 memcpy(xbuf, "perm", 5);
211 } else if (now.tv_sec >= key->expiry) {
212 memcpy(xbuf, "expd", 5);
213 } else {
214 timo = key->expiry - now.tv_sec;
215
216 if (timo < 60)
217 sprintf(xbuf, "%lus", timo);
218 else if (timo < 60*60)
219 sprintf(xbuf, "%lum", timo / 60);
220 else if (timo < 60*60*24)
221 sprintf(xbuf, "%luh", timo / (60*60));
222 else if (timo < 60*60*24*7)
223 sprintf(xbuf, "%lud", timo / (60*60*24));
224 else
225 sprintf(xbuf, "%luw", timo / (60*60*24*7));
226 }
227
228#define showflag(KEY, LETTER, FLAG) \
229 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
230
231 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
232 key->serial,
233 showflag(key, 'I', KEY_FLAG_INSTANTIATED),
234 showflag(key, 'R', KEY_FLAG_REVOKED),
235 showflag(key, 'D', KEY_FLAG_DEAD),
236 showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
237 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
238 showflag(key, 'N', KEY_FLAG_NEGATIVE),
239 atomic_read(&key->usage),
240 xbuf,
241 key->perm,
242 key->uid,
243 key->gid,
244 key->type->name);
245
246#undef showflag
247
248 if (key->type->describe)
249 key->type->describe(key, m);
250 seq_putc(m, '\n');
251
252 rcu_read_unlock();
253 return 0;
254}
255
256#endif
257
258static struct rb_node *__key_user_next(struct rb_node *n)
259{
260 while (n) {
261 struct key_user *user = rb_entry(n, struct key_user, node);
262 if (user->user_ns == current_user_ns())
263 break;
264 n = rb_next(n);
265 }
266 return n;
267}
268
269static struct rb_node *key_user_next(struct rb_node *n)
270{
271 return __key_user_next(rb_next(n));
272}
273
274static struct rb_node *key_user_first(struct rb_root *r)
275{
276 struct rb_node *n = rb_first(r);
277 return __key_user_next(n);
278}
279
280
281
282
283
284static int proc_key_users_open(struct inode *inode, struct file *file)
285{
286 return seq_open(file, &proc_key_users_ops);
287}
288
289static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
290 __acquires(key_user_lock)
291{
292 struct rb_node *_p;
293 loff_t pos = *_pos;
294
295 spin_lock(&key_user_lock);
296
297 _p = key_user_first(&key_user_tree);
298 while (pos > 0 && _p) {
299 pos--;
300 _p = key_user_next(_p);
301 }
302
303 return _p;
304}
305
306static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
307{
308 (*_pos)++;
309 return key_user_next((struct rb_node *)v);
310}
311
312static void proc_key_users_stop(struct seq_file *p, void *v)
313 __releases(key_user_lock)
314{
315 spin_unlock(&key_user_lock);
316}
317
318static int proc_key_users_show(struct seq_file *m, void *v)
319{
320 struct rb_node *_p = v;
321 struct key_user *user = rb_entry(_p, struct key_user, node);
322 unsigned maxkeys = (user->uid == 0) ?
323 key_quota_root_maxkeys : key_quota_maxkeys;
324 unsigned maxbytes = (user->uid == 0) ?
325 key_quota_root_maxbytes : key_quota_maxbytes;
326
327 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
328 user->uid,
329 atomic_read(&user->usage),
330 atomic_read(&user->nkeys),
331 atomic_read(&user->nikeys),
332 user->qnkeys,
333 maxkeys,
334 user->qnbytes,
335 maxbytes);
336
337 return 0;
338
339}
340
