fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / security / keys / proc.c
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1 /* proc.c: proc files for key database enumeration
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include <linux/slab.h>
16 #include <linux/fs.h>
17 #include <linux/proc_fs.h>
18 #include <linux/seq_file.h>
19 #include <asm/errno.h>
20 #include "internal.h"
22 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
23 static int proc_keys_open(struct inode *inode, struct file *file);
24 static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
25 static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
26 static void proc_keys_stop(struct seq_file *p, void *v);
27 static int proc_keys_show(struct seq_file *m, void *v);
29 static struct seq_operations proc_keys_ops = {
30 .start = proc_keys_start,
31 .next = proc_keys_next,
32 .stop = proc_keys_stop,
33 .show = proc_keys_show,
36 static const struct file_operations proc_keys_fops = {
37 .open = proc_keys_open,
38 .read = seq_read,
39 .llseek = seq_lseek,
40 .release = seq_release,
42 #endif
44 static int proc_key_users_open(struct inode *inode, struct file *file);
45 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
46 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
47 static void proc_key_users_stop(struct seq_file *p, void *v);
48 static int proc_key_users_show(struct seq_file *m, void *v);
50 static struct seq_operations proc_key_users_ops = {
51 .start = proc_key_users_start,
52 .next = proc_key_users_next,
53 .stop = proc_key_users_stop,
54 .show = proc_key_users_show,
57 static const struct file_operations proc_key_users_fops = {
58 .open = proc_key_users_open,
59 .read = seq_read,
60 .llseek = seq_lseek,
61 .release = seq_release,
64 /*****************************************************************************/
66 * declare the /proc files
68 static int __init key_proc_init(void)
70 struct proc_dir_entry *p;
72 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
73 p = create_proc_entry("keys", 0, NULL);
74 if (!p)
75 panic("Cannot create /proc/keys\n");
77 p->proc_fops = &proc_keys_fops;
78 #endif
80 p = create_proc_entry("key-users", 0, NULL);
81 if (!p)
82 panic("Cannot create /proc/key-users\n");
84 p->proc_fops = &proc_key_users_fops;
86 return 0;
88 } /* end key_proc_init() */
90 __initcall(key_proc_init);
92 /*****************************************************************************/
94 * implement "/proc/keys" to provides a list of the keys on the system
96 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
98 static int proc_keys_open(struct inode *inode, struct file *file)
100 return seq_open(file, &proc_keys_ops);
104 static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
106 struct rb_node *_p;
107 loff_t pos = *_pos;
109 spin_lock(&key_serial_lock);
111 _p = rb_first(&key_serial_tree);
112 while (pos > 0 && _p) {
113 pos--;
114 _p = rb_next(_p);
117 return _p;
121 static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
123 (*_pos)++;
124 return rb_next((struct rb_node *) v);
128 static void proc_keys_stop(struct seq_file *p, void *v)
130 spin_unlock(&key_serial_lock);
133 static int proc_keys_show(struct seq_file *m, void *v)
135 struct rb_node *_p = v;
136 struct key *key = rb_entry(_p, struct key, serial_node);
137 struct timespec now;
138 unsigned long timo;
139 char xbuf[12];
140 int rc;
142 /* check whether the current task is allowed to view the key (assuming
143 * non-possession) */
144 rc = key_task_permission(make_key_ref(key, 0), current, KEY_VIEW);
145 if (rc < 0)
146 return 0;
148 now = current_kernel_time();
150 rcu_read_lock();
152 /* come up with a suitable timeout value */
153 if (key->expiry == 0) {
154 memcpy(xbuf, "perm", 5);
156 else if (now.tv_sec >= key->expiry) {
157 memcpy(xbuf, "expd", 5);
159 else {
160 timo = key->expiry - now.tv_sec;
162 if (timo < 60)
163 sprintf(xbuf, "%lus", timo);
164 else if (timo < 60*60)
165 sprintf(xbuf, "%lum", timo / 60);
166 else if (timo < 60*60*24)
167 sprintf(xbuf, "%luh", timo / (60*60));
168 else if (timo < 60*60*24*7)
169 sprintf(xbuf, "%lud", timo / (60*60*24));
170 else
171 sprintf(xbuf, "%luw", timo / (60*60*24*7));
174 #define showflag(KEY, LETTER, FLAG) \
175 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
177 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
178 key->serial,
179 showflag(key, 'I', KEY_FLAG_INSTANTIATED),
180 showflag(key, 'R', KEY_FLAG_REVOKED),
181 showflag(key, 'D', KEY_FLAG_DEAD),
182 showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
183 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
184 showflag(key, 'N', KEY_FLAG_NEGATIVE),
185 atomic_read(&key->usage),
186 xbuf,
187 key->perm,
188 key->uid,
189 key->gid,
190 key->type->name);
192 #undef showflag
194 if (key->type->describe)
195 key->type->describe(key, m);
196 seq_putc(m, '\n');
198 rcu_read_unlock();
200 return 0;
204 #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
206 /*****************************************************************************/
208 * implement "/proc/key-users" to provides a list of the key users
210 static int proc_key_users_open(struct inode *inode, struct file *file)
212 return seq_open(file, &proc_key_users_ops);
216 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
218 struct rb_node *_p;
219 loff_t pos = *_pos;
221 spin_lock(&key_user_lock);
223 _p = rb_first(&key_user_tree);
224 while (pos > 0 && _p) {
225 pos--;
226 _p = rb_next(_p);
229 return _p;
233 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
235 (*_pos)++;
236 return rb_next((struct rb_node *) v);
240 static void proc_key_users_stop(struct seq_file *p, void *v)
242 spin_unlock(&key_user_lock);
245 static int proc_key_users_show(struct seq_file *m, void *v)
247 struct rb_node *_p = v;
248 struct key_user *user = rb_entry(_p, struct key_user, node);
250 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
251 user->uid,
252 atomic_read(&user->usage),
253 atomic_read(&user->nkeys),
254 atomic_read(&user->nikeys),
255 user->qnkeys,
256 KEYQUOTA_MAX_KEYS,
257 user->qnbytes,
258 KEYQUOTA_MAX_BYTES
261 return 0;