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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/ipc/util.c
3 * Copyright (C) 1992 Krishna Balasubramanian
4 *
5 * Sep 1997 - Call suser() last after "normal" permission checks so we
6 * get BSD style process accounting right.
7 * Occurs in several places in the IPC code.
8 * Chris Evans, <chris@ferret.lmh.ox.ac.uk>
9 * Nov 1999 - ipc helper functions, unified SMP locking
Christian Kujau624dffc2006-01-15 02:43:54 +010010 * Manfred Spraul <manfred@colorfullife.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary().
12 * Mingming Cao <cmm@us.ibm.com>
Steve Grubb073115d2006-04-02 17:07:33 -040013 * Mar 2006 - support for audit of ipc object properties
14 * Dustin Kirkland <dustin.kirkland@us.ibm.com>
Kirill Korotaev73ea4132006-10-02 02:18:20 -070015 * Jun 2006 - namespaces ssupport
16 * OpenVZ, SWsoft Inc.
17 * Pavel Emelianov <xemul@openvz.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/mm.h>
21#include <linux/shm.h>
22#include <linux/init.h>
23#include <linux/msg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/vmalloc.h>
25#include <linux/slab.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080026#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/highuid.h>
28#include <linux/security.h>
29#include <linux/rcupdate.h>
30#include <linux/workqueue.h>
Mike Waychisonae781772005-09-06 15:17:09 -070031#include <linux/seq_file.h>
32#include <linux/proc_fs.h>
Steve Grubb073115d2006-04-02 17:07:33 -040033#include <linux/audit.h>
Kirill Korotaev73ea4132006-10-02 02:18:20 -070034#include <linux/nsproxy.h>
Nadia Derbey3e148c72007-10-18 23:40:54 -070035#include <linux/rwsem.h>
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070036#include <linux/memory.h>
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080037#include <linux/ipc_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/unistd.h>
40
41#include "util.h"
42
Mike Waychisonae781772005-09-06 15:17:09 -070043struct ipc_proc_iface {
44 const char *path;
45 const char *header;
Kirill Korotaev73ea4132006-10-02 02:18:20 -070046 int ids;
Mike Waychisonae781772005-09-06 15:17:09 -070047 int (*show)(struct seq_file *, void *);
48};
49
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070050#ifdef CONFIG_MEMORY_HOTPLUG
51
Nadia Derbey424450c2008-04-29 01:00:43 -070052static void ipc_memory_notifier(struct work_struct *work)
53{
54 ipcns_notify(IPCNS_MEMCHANGED);
55}
56
57static DECLARE_WORK(ipc_memory_wq, ipc_memory_notifier);
58
59
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070060static int ipc_memory_callback(struct notifier_block *self,
61 unsigned long action, void *arg)
62{
63 switch (action) {
64 case MEM_ONLINE: /* memory successfully brought online */
65 case MEM_OFFLINE: /* or offline: it's time to recompute msgmni */
66 /*
67 * This is done by invoking the ipcns notifier chain with the
68 * IPC_MEMCHANGED event.
Nadia Derbey424450c2008-04-29 01:00:43 -070069 * In order not to keep the lock on the hotplug memory chain
70 * for too long, queue a work item that will, when waken up,
71 * activate the ipcns notification chain.
72 * No need to keep several ipc work items on the queue.
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070073 */
Nadia Derbey424450c2008-04-29 01:00:43 -070074 if (!work_pending(&ipc_memory_wq))
75 schedule_work(&ipc_memory_wq);
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070076 break;
77 case MEM_GOING_ONLINE:
78 case MEM_GOING_OFFLINE:
79 case MEM_CANCEL_ONLINE:
80 case MEM_CANCEL_OFFLINE:
81 default:
82 break;
83 }
84
85 return NOTIFY_OK;
86}
87
88#endif /* CONFIG_MEMORY_HOTPLUG */
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090/**
91 * ipc_init - initialise IPC subsystem
92 *
93 * The various system5 IPC resources (semaphores, messages and shared
Robert P. J. Day72fd4a32007-02-10 01:45:59 -080094 * memory) are initialised
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070095 * A callback routine is registered into the memory hotplug notifier
96 * chain: since msgmni scales to lowmem this callback routine will be
97 * called upon successful memory add / remove to recompute msmgni.
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 */
99
100static int __init ipc_init(void)
101{
102 sem_init();
103 msg_init();
104 shm_init();
Nadia Derbeyb6b337a2008-04-29 01:00:42 -0700105 hotplug_memory_notifier(ipc_memory_callback, IPC_CALLBACK_PRI);
106 register_ipcns_notifier(&init_ipc_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 return 0;
108}
109__initcall(ipc_init);
110
111/**
112 * ipc_init_ids - initialise IPC identifiers
113 * @ids: Identifier set
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 *
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700115 * Set up the sequence range to use for the ipc identifier range (limited
116 * below IPCMNI) then initialise the ids idr.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 */
118
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700119void ipc_init_ids(struct ipc_ids *ids)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
Nadia Derbey3e148c72007-10-18 23:40:54 -0700121 init_rwsem(&ids->rw_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 ids->in_use = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 ids->seq = 0;
125 {
126 int seq_limit = INT_MAX/SEQ_MULTIPLIER;
Zhang, Yanmin44f564a2008-04-29 01:00:55 -0700127 if (seq_limit > USHORT_MAX)
128 ids->seq_max = USHORT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 else
130 ids->seq_max = seq_limit;
131 }
132
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700133 idr_init(&ids->ipcs_idr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
Mike Waychisonae781772005-09-06 15:17:09 -0700136#ifdef CONFIG_PROC_FS
Arjan van de Ven9a321442007-02-12 00:55:35 -0800137static const struct file_operations sysvipc_proc_fops;
Mike Waychisonae781772005-09-06 15:17:09 -0700138/**
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800139 * ipc_init_proc_interface - Create a proc interface for sysipc types using a seq_file interface.
Mike Waychisonae781772005-09-06 15:17:09 -0700140 * @path: Path in procfs
141 * @header: Banner to be printed at the beginning of the file.
142 * @ids: ipc id table to iterate.
143 * @show: show routine.
144 */
145void __init ipc_init_proc_interface(const char *path, const char *header,
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700146 int ids, int (*show)(struct seq_file *, void *))
Mike Waychisonae781772005-09-06 15:17:09 -0700147{
148 struct proc_dir_entry *pde;
149 struct ipc_proc_iface *iface;
150
151 iface = kmalloc(sizeof(*iface), GFP_KERNEL);
152 if (!iface)
153 return;
154 iface->path = path;
155 iface->header = header;
156 iface->ids = ids;
157 iface->show = show;
158
Denis V. Lunev6a6375d2008-04-29 01:02:12 -0700159 pde = proc_create_data(path,
160 S_IRUGO, /* world readable */
161 NULL, /* parent dir */
162 &sysvipc_proc_fops,
163 iface);
164 if (!pde) {
Mike Waychisonae781772005-09-06 15:17:09 -0700165 kfree(iface);
166 }
167}
168#endif
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170/**
171 * ipc_findkey - find a key in an ipc identifier set
172 * @ids: Identifier set
173 * @key: The key to find
174 *
Nadia Derbey3e148c72007-10-18 23:40:54 -0700175 * Requires ipc_ids.rw_mutex locked.
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700176 * Returns the LOCKED pointer to the ipc structure if found or NULL
177 * if not.
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700178 * If key is found ipc points to the owning ipc structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 */
180
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700181static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700183 struct kern_ipc_perm *ipc;
184 int next_id;
185 int total;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700187 for (total = 0, next_id = 0; total < ids->in_use; next_id++) {
188 ipc = idr_find(&ids->ipcs_idr, next_id);
189
190 if (ipc == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 continue;
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700192
193 if (ipc->key != key) {
194 total++;
195 continue;
196 }
197
198 ipc_lock_by_ptr(ipc);
199 return ipc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700201
202 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203}
204
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700205/**
206 * ipc_get_maxid - get the last assigned id
207 * @ids: IPC identifier set
208 *
Nadia Derbey3e148c72007-10-18 23:40:54 -0700209 * Called with ipc_ids.rw_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 */
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700211
212int ipc_get_maxid(struct ipc_ids *ids)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213{
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700214 struct kern_ipc_perm *ipc;
215 int max_id = -1;
216 int total, id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700218 if (ids->in_use == 0)
219 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700221 if (ids->in_use == IPCMNI)
222 return IPCMNI - 1;
223
224 /* Look for the last assigned id */
225 total = 0;
226 for (id = 0; id < IPCMNI && total < ids->in_use; id++) {
227 ipc = idr_find(&ids->ipcs_idr, id);
228 if (ipc != NULL) {
229 max_id = id;
230 total++;
231 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 }
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700233 return max_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
236/**
237 * ipc_addid - add an IPC identifier
238 * @ids: IPC identifier set
239 * @new: new IPC permission set
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700240 * @size: limit for the number of used ids
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 *
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700242 * Add an entry 'new' to the IPC ids idr. The permissions object is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 * initialised and the first free entry is set up and the id assigned
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700244 * is returned. The 'new' entry is returned in a locked state on success.
Pierre Peiffer283bb7f2007-10-18 23:40:57 -0700245 * On failure the entry is not locked and a negative err-code is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 *
Nadia Derbey3e148c72007-10-18 23:40:54 -0700247 * Called with ipc_ids.rw_mutex held as a writer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 */
249
250int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
251{
David Howells414c0702008-11-14 10:39:06 +1100252 uid_t euid;
253 gid_t egid;
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700254 int id, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700256 if (size > IPCMNI)
257 size = IPCMNI;
258
259 if (ids->in_use >= size)
Pierre Peiffer283bb7f2007-10-18 23:40:57 -0700260 return -ENOSPC;
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700261
Nadia Derbeye00b4ff7e2008-11-19 15:36:08 -0800262 spin_lock_init(&new->lock);
263 new->deleted = 0;
264 rcu_read_lock();
265 spin_lock(&new->lock);
266
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700267 err = idr_get_new(&ids->ipcs_idr, new, &id);
Nadia Derbeye00b4ff7e2008-11-19 15:36:08 -0800268 if (err) {
269 spin_unlock(&new->lock);
270 rcu_read_unlock();
Pierre Peiffer283bb7f2007-10-18 23:40:57 -0700271 return err;
Nadia Derbeye00b4ff7e2008-11-19 15:36:08 -0800272 }
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 ids->in_use++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
David Howells414c0702008-11-14 10:39:06 +1100276 current_euid_egid(&euid, &egid);
277 new->cuid = new->uid = euid;
278 new->gid = new->cgid = egid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
280 new->seq = ids->seq++;
281 if(ids->seq > ids->seq_max)
282 ids->seq = 0;
283
Pierre Peiffer48dea402008-04-29 01:00:35 -0700284 new->id = ipc_buildid(id, new->seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return id;
286}
287
288/**
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700289 * ipcget_new - create a new ipc object
290 * @ns: namespace
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700291 * @ids: IPC identifer set
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700292 * @ops: the actual creation routine to call
293 * @params: its parameters
294 *
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700295 * This routine is called by sys_msgget, sys_semget() and sys_shmget()
296 * when the key is IPC_PRIVATE.
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700297 */
Pavel Emelyanovb2d75cd2008-02-08 04:18:54 -0800298static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700299 struct ipc_ops *ops, struct ipc_params *params)
300{
301 int err;
Pierre Peiffer283bb7f2007-10-18 23:40:57 -0700302retry:
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700303 err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL);
304
305 if (!err)
306 return -ENOMEM;
307
Nadia Derbey3e148c72007-10-18 23:40:54 -0700308 down_write(&ids->rw_mutex);
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700309 err = ops->getnew(ns, params);
Nadia Derbey3e148c72007-10-18 23:40:54 -0700310 up_write(&ids->rw_mutex);
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700311
Pierre Peiffer283bb7f2007-10-18 23:40:57 -0700312 if (err == -EAGAIN)
313 goto retry;
314
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700315 return err;
316}
317
318/**
319 * ipc_check_perms - check security and permissions for an IPC
320 * @ipcp: ipc permission set
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700321 * @ops: the actual security routine to call
322 * @params: its parameters
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700323 *
324 * This routine is called by sys_msgget(), sys_semget() and sys_shmget()
325 * when the key is not IPC_PRIVATE and that key already exists in the
326 * ids IDR.
327 *
328 * On success, the IPC id is returned.
329 *
Nadia Derbey3e148c72007-10-18 23:40:54 -0700330 * It is called with ipc_ids.rw_mutex and ipcp->lock held.
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700331 */
332static int ipc_check_perms(struct kern_ipc_perm *ipcp, struct ipc_ops *ops,
333 struct ipc_params *params)
334{
335 int err;
336
337 if (ipcperms(ipcp, params->flg))
338 err = -EACCES;
339 else {
340 err = ops->associate(ipcp, params->flg);
341 if (!err)
342 err = ipcp->id;
343 }
344
345 return err;
346}
347
348/**
349 * ipcget_public - get an ipc object or create a new one
350 * @ns: namespace
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700351 * @ids: IPC identifer set
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700352 * @ops: the actual creation routine to call
353 * @params: its parameters
354 *
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700355 * This routine is called by sys_msgget, sys_semget() and sys_shmget()
356 * when the key is not IPC_PRIVATE.
357 * It adds a new entry if the key is not found and does some permission
358 * / security checkings if the key is found.
359 *
360 * On success, the ipc id is returned.
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700361 */
Pavel Emelyanovb2d75cd2008-02-08 04:18:54 -0800362static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700363 struct ipc_ops *ops, struct ipc_params *params)
364{
365 struct kern_ipc_perm *ipcp;
366 int flg = params->flg;
367 int err;
Pierre Peiffer283bb7f2007-10-18 23:40:57 -0700368retry:
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700369 err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL);
370
Nadia Derbey3e148c72007-10-18 23:40:54 -0700371 /*
372 * Take the lock as a writer since we are potentially going to add
373 * a new entry + read locks are not "upgradable"
374 */
375 down_write(&ids->rw_mutex);
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700376 ipcp = ipc_findkey(ids, params->key);
377 if (ipcp == NULL) {
378 /* key not used */
379 if (!(flg & IPC_CREAT))
380 err = -ENOENT;
381 else if (!err)
382 err = -ENOMEM;
383 else
384 err = ops->getnew(ns, params);
385 } else {
386 /* ipc object has been locked by ipc_findkey() */
387
388 if (flg & IPC_CREAT && flg & IPC_EXCL)
389 err = -EEXIST;
390 else {
391 err = 0;
392 if (ops->more_checks)
393 err = ops->more_checks(ipcp, params);
394 if (!err)
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700395 /*
396 * ipc_check_perms returns the IPC id on
397 * success
398 */
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700399 err = ipc_check_perms(ipcp, ops, params);
400 }
401 ipc_unlock(ipcp);
402 }
Nadia Derbey3e148c72007-10-18 23:40:54 -0700403 up_write(&ids->rw_mutex);
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700404
Pierre Peiffer283bb7f2007-10-18 23:40:57 -0700405 if (err == -EAGAIN)
406 goto retry;
407
Nadia Derbey7748dbf2007-10-18 23:40:49 -0700408 return err;
409}
410
411
412/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 * ipc_rmid - remove an IPC identifier
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700414 * @ids: IPC identifier set
415 * @ipcp: ipc perm structure containing the identifier to remove
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 *
Nadia Derbey3e148c72007-10-18 23:40:54 -0700417 * ipc_ids.rw_mutex (as a writer) and the spinlock for this ID are held
418 * before this function is called, and remain locked on the exit.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 */
420
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700421void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Nadia Derbeyce621f52007-10-18 23:40:52 -0700423 int lid = ipcid_to_idx(ipcp->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700425 idr_remove(&ids->ipcs_idr, lid);
426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 ids->in_use--;
428
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700429 ipcp->deleted = 1;
430
431 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433
434/**
435 * ipc_alloc - allocate ipc space
436 * @size: size desired
437 *
438 * Allocate memory from the appropriate pools and return a pointer to it.
439 * NULL is returned if the allocation fails
440 */
441
442void* ipc_alloc(int size)
443{
444 void* out;
445 if(size > PAGE_SIZE)
446 out = vmalloc(size);
447 else
448 out = kmalloc(size, GFP_KERNEL);
449 return out;
450}
451
452/**
453 * ipc_free - free ipc space
454 * @ptr: pointer returned by ipc_alloc
455 * @size: size of block
456 *
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800457 * Free a block created with ipc_alloc(). The caller must know the size
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 * used in the allocation call.
459 */
460
461void ipc_free(void* ptr, int size)
462{
463 if(size > PAGE_SIZE)
464 vfree(ptr);
465 else
466 kfree(ptr);
467}
468
469/*
470 * rcu allocations:
471 * There are three headers that are prepended to the actual allocation:
472 * - during use: ipc_rcu_hdr.
473 * - during the rcu grace period: ipc_rcu_grace.
474 * - [only if vmalloc]: ipc_rcu_sched.
475 * Their lifetime doesn't overlap, thus the headers share the same memory.
476 * Unlike a normal union, they are right-aligned, thus some container_of
477 * forward/backward casting is necessary:
478 */
479struct ipc_rcu_hdr
480{
481 int refcount;
482 int is_vmalloc;
483 void *data[0];
484};
485
486
487struct ipc_rcu_grace
488{
489 struct rcu_head rcu;
490 /* "void *" makes sure alignment of following data is sane. */
491 void *data[0];
492};
493
494struct ipc_rcu_sched
495{
496 struct work_struct work;
497 /* "void *" makes sure alignment of following data is sane. */
498 void *data[0];
499};
500
501#define HDRLEN_KMALLOC (sizeof(struct ipc_rcu_grace) > sizeof(struct ipc_rcu_hdr) ? \
502 sizeof(struct ipc_rcu_grace) : sizeof(struct ipc_rcu_hdr))
503#define HDRLEN_VMALLOC (sizeof(struct ipc_rcu_sched) > HDRLEN_KMALLOC ? \
504 sizeof(struct ipc_rcu_sched) : HDRLEN_KMALLOC)
505
506static inline int rcu_use_vmalloc(int size)
507{
508 /* Too big for a single page? */
509 if (HDRLEN_KMALLOC + size > PAGE_SIZE)
510 return 1;
511 return 0;
512}
513
514/**
515 * ipc_rcu_alloc - allocate ipc and rcu space
516 * @size: size desired
517 *
518 * Allocate memory for the rcu header structure + the object.
519 * Returns the pointer to the object.
520 * NULL is returned if the allocation fails.
521 */
522
523void* ipc_rcu_alloc(int size)
524{
525 void* out;
526 /*
527 * We prepend the allocation with the rcu struct, and
528 * workqueue if necessary (for vmalloc).
529 */
530 if (rcu_use_vmalloc(size)) {
531 out = vmalloc(HDRLEN_VMALLOC + size);
532 if (out) {
533 out += HDRLEN_VMALLOC;
534 container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 1;
535 container_of(out, struct ipc_rcu_hdr, data)->refcount = 1;
536 }
537 } else {
538 out = kmalloc(HDRLEN_KMALLOC + size, GFP_KERNEL);
539 if (out) {
540 out += HDRLEN_KMALLOC;
541 container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 0;
542 container_of(out, struct ipc_rcu_hdr, data)->refcount = 1;
543 }
544 }
545
546 return out;
547}
548
549void ipc_rcu_getref(void *ptr)
550{
551 container_of(ptr, struct ipc_rcu_hdr, data)->refcount++;
552}
553
David Howells65f27f32006-11-22 14:55:48 +0000554static void ipc_do_vfree(struct work_struct *work)
555{
556 vfree(container_of(work, struct ipc_rcu_sched, work));
557}
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559/**
Randy Dunlap1e5d5332005-11-07 01:01:06 -0800560 * ipc_schedule_free - free ipc + rcu space
561 * @head: RCU callback structure for queued work
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 *
563 * Since RCU callback function is called in bh,
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800564 * we need to defer the vfree to schedule_work().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 */
566static void ipc_schedule_free(struct rcu_head *head)
567{
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700568 struct ipc_rcu_grace *grace;
569 struct ipc_rcu_sched *sched;
570
571 grace = container_of(head, struct ipc_rcu_grace, rcu);
572 sched = container_of(&(grace->data[0]), struct ipc_rcu_sched,
573 data[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
David Howells65f27f32006-11-22 14:55:48 +0000575 INIT_WORK(&sched->work, ipc_do_vfree);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 schedule_work(&sched->work);
577}
578
579/**
Randy Dunlap1e5d5332005-11-07 01:01:06 -0800580 * ipc_immediate_free - free ipc + rcu space
581 * @head: RCU callback structure that contains pointer to be freed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 *
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800583 * Free from the RCU callback context.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 */
585static void ipc_immediate_free(struct rcu_head *head)
586{
587 struct ipc_rcu_grace *free =
588 container_of(head, struct ipc_rcu_grace, rcu);
589 kfree(free);
590}
591
592void ipc_rcu_putref(void *ptr)
593{
594 if (--container_of(ptr, struct ipc_rcu_hdr, data)->refcount > 0)
595 return;
596
597 if (container_of(ptr, struct ipc_rcu_hdr, data)->is_vmalloc) {
598 call_rcu(&container_of(ptr, struct ipc_rcu_grace, data)->rcu,
599 ipc_schedule_free);
600 } else {
601 call_rcu(&container_of(ptr, struct ipc_rcu_grace, data)->rcu,
602 ipc_immediate_free);
603 }
604}
605
606/**
607 * ipcperms - check IPC permissions
608 * @ipcp: IPC permission set
609 * @flag: desired permission set.
610 *
611 * Check user, group, other permissions for access
612 * to ipc resources. return 0 if allowed
613 */
614
615int ipcperms (struct kern_ipc_perm *ipcp, short flag)
616{ /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
David Howells414c0702008-11-14 10:39:06 +1100617 uid_t euid = current_euid();
Al Viroa33e6752008-12-10 03:40:06 -0500618 int requested_mode, granted_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Al Viroa33e6752008-12-10 03:40:06 -0500620 audit_ipc_obj(ipcp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 requested_mode = (flag >> 6) | (flag >> 3) | flag;
622 granted_mode = ipcp->mode;
David Howells414c0702008-11-14 10:39:06 +1100623 if (euid == ipcp->cuid ||
624 euid == ipcp->uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 granted_mode >>= 6;
626 else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid))
627 granted_mode >>= 3;
628 /* is there some bit set in requested_mode but not in granted_mode? */
629 if ((requested_mode & ~granted_mode & 0007) &&
630 !capable(CAP_IPC_OWNER))
631 return -1;
632
633 return security_ipc_permission(ipcp, flag);
634}
635
636/*
637 * Functions to convert between the kern_ipc_perm structure and the
638 * old/new ipc_perm structures
639 */
640
641/**
642 * kernel_to_ipc64_perm - convert kernel ipc permissions to user
643 * @in: kernel permissions
644 * @out: new style IPC permissions
645 *
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800646 * Turn the kernel object @in into a set of permissions descriptions
647 * for returning to userspace (@out).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 */
649
650
651void kernel_to_ipc64_perm (struct kern_ipc_perm *in, struct ipc64_perm *out)
652{
653 out->key = in->key;
654 out->uid = in->uid;
655 out->gid = in->gid;
656 out->cuid = in->cuid;
657 out->cgid = in->cgid;
658 out->mode = in->mode;
659 out->seq = in->seq;
660}
661
662/**
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700663 * ipc64_perm_to_ipc_perm - convert new ipc permissions to old
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 * @in: new style IPC permissions
665 * @out: old style IPC permissions
666 *
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800667 * Turn the new style permissions object @in into a compatibility
668 * object and store it into the @out pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 */
670
671void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out)
672{
673 out->key = in->key;
674 SET_UID(out->uid, in->uid);
675 SET_GID(out->gid, in->gid);
676 SET_UID(out->cuid, in->cuid);
677 SET_GID(out->cgid, in->cgid);
678 out->mode = in->mode;
679 out->seq = in->seq;
680}
681
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700682/**
Nadia Derbey3e148c72007-10-18 23:40:54 -0700683 * ipc_lock - Lock an ipc structure without rw_mutex held
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700684 * @ids: IPC identifier set
685 * @id: ipc id to look for
686 *
687 * Look for an id in the ipc ids idr and lock the associated ipc object.
688 *
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700689 * The ipc object is locked on exit.
690 */
691
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700692struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700694 struct kern_ipc_perm *out;
Nadia Derbeyce621f52007-10-18 23:40:52 -0700695 int lid = ipcid_to_idx(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 rcu_read_lock();
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700698 out = idr_find(&ids->ipcs_idr, lid);
699 if (out == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 rcu_read_unlock();
Nadia Derbey023a5352007-10-18 23:40:51 -0700701 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 }
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700703
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 spin_lock(&out->lock);
705
706 /* ipc_rmid() may have already freed the ID while ipc_lock
707 * was spinning: here verify that the structure is still valid
708 */
709 if (out->deleted) {
710 spin_unlock(&out->lock);
711 rcu_read_unlock();
Nadia Derbey023a5352007-10-18 23:40:51 -0700712 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 }
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700714
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 return out;
716}
717
Pavel Emelyanovb2d75cd2008-02-08 04:18:54 -0800718struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id)
719{
720 struct kern_ipc_perm *out;
721
722 out = ipc_lock(ids, id);
723 if (IS_ERR(out))
724 return out;
725
726 if (ipc_checkid(out, id)) {
727 ipc_unlock(out);
728 return ERR_PTR(-EIDRM);
729 }
730
731 return out;
732}
733
734/**
735 * ipcget - Common sys_*get() code
736 * @ns : namsepace
737 * @ids : IPC identifier set
738 * @ops : operations to be called on ipc object creation, permission checks
739 * and further checks
740 * @params : the parameters needed by the previous operations.
741 *
742 * Common routine called by sys_msgget(), sys_semget() and sys_shmget().
743 */
744int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
745 struct ipc_ops *ops, struct ipc_params *params)
746{
747 if (params->key == IPC_PRIVATE)
748 return ipcget_new(ns, ids, ops, params);
749 else
750 return ipcget_public(ns, ids, ops, params);
751}
752
Pierre Peiffer8f4a3802008-04-29 01:00:51 -0700753/**
754 * ipc_update_perm - update the permissions of an IPC.
755 * @in: the permission given as input.
756 * @out: the permission of the ipc to set.
757 */
758void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
759{
760 out->uid = in->uid;
761 out->gid = in->gid;
762 out->mode = (out->mode & ~S_IRWXUGO)
763 | (in->mode & S_IRWXUGO);
764}
765
Pierre Peiffera5f75e72008-04-29 01:00:54 -0700766/**
767 * ipcctl_pre_down - retrieve an ipc and check permissions for some IPC_XXX cmd
768 * @ids: the table of ids where to look for the ipc
769 * @id: the id of the ipc to retrieve
770 * @cmd: the cmd to check
771 * @perm: the permission to set
772 * @extra_perm: one extra permission parameter used by msq
773 *
774 * This function does some common audit and permissions check for some IPC_XXX
775 * cmd and is called from semctl_down, shmctl_down and msgctl_down.
776 * It must be called without any lock held and
777 * - retrieves the ipc with the given id in the given table.
778 * - performs some audit and permission check, depending on the given cmd
779 * - returns the ipc with both ipc and rw_mutex locks held in case of success
780 * or an err-code without any lock held otherwise.
781 */
782struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
783 struct ipc64_perm *perm, int extra_perm)
784{
785 struct kern_ipc_perm *ipcp;
David Howells414c0702008-11-14 10:39:06 +1100786 uid_t euid;
Pierre Peiffera5f75e72008-04-29 01:00:54 -0700787 int err;
788
789 down_write(&ids->rw_mutex);
Nadia Derbey00c2bf82008-07-25 01:48:03 -0700790 ipcp = ipc_lock_check(ids, id);
Pierre Peiffera5f75e72008-04-29 01:00:54 -0700791 if (IS_ERR(ipcp)) {
792 err = PTR_ERR(ipcp);
793 goto out_up;
794 }
795
Al Viroa33e6752008-12-10 03:40:06 -0500796 audit_ipc_obj(ipcp);
Al Viroe816f372008-12-10 03:47:15 -0500797 if (cmd == IPC_SET)
798 audit_ipc_set_perm(extra_perm, perm->uid,
Pierre Peiffera5f75e72008-04-29 01:00:54 -0700799 perm->gid, perm->mode);
David Howells414c0702008-11-14 10:39:06 +1100800
801 euid = current_euid();
802 if (euid == ipcp->cuid ||
803 euid == ipcp->uid || capable(CAP_SYS_ADMIN))
Pierre Peiffera5f75e72008-04-29 01:00:54 -0700804 return ipcp;
805
806 err = -EPERM;
Pierre Peiffera5f75e72008-04-29 01:00:54 -0700807 ipc_unlock(ipcp);
808out_up:
809 up_write(&ids->rw_mutex);
810 return ERR_PTR(err);
811}
812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813#ifdef __ARCH_WANT_IPC_PARSE_VERSION
814
815
816/**
817 * ipc_parse_version - IPC call version
818 * @cmd: pointer to command
819 *
820 * Return IPC_64 for new style IPC and IPC_OLD for old style IPC.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800821 * The @cmd value is turned from an encoding command and version into
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 * just the command code.
823 */
824
825int ipc_parse_version (int *cmd)
826{
827 if (*cmd & IPC_64) {
828 *cmd ^= IPC_64;
829 return IPC_64;
830 } else {
831 return IPC_OLD;
832 }
833}
834
835#endif /* __ARCH_WANT_IPC_PARSE_VERSION */
Mike Waychisonae781772005-09-06 15:17:09 -0700836
837#ifdef CONFIG_PROC_FS
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800838struct ipc_proc_iter {
839 struct ipc_namespace *ns;
840 struct ipc_proc_iface *iface;
841};
842
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700843/*
844 * This routine locks the ipc structure found at least at position pos.
845 */
Adrian Bunkb524b9a2008-02-06 01:36:28 -0800846static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t pos,
847 loff_t *new_pos)
Mike Waychisonae781772005-09-06 15:17:09 -0700848{
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700849 struct kern_ipc_perm *ipc;
850 int total, id;
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700851
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700852 total = 0;
853 for (id = 0; id < pos && total < ids->in_use; id++) {
854 ipc = idr_find(&ids->ipcs_idr, id);
855 if (ipc != NULL)
856 total++;
857 }
Mike Waychisonae781772005-09-06 15:17:09 -0700858
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700859 if (total >= ids->in_use)
860 return NULL;
Mike Waychisonae781772005-09-06 15:17:09 -0700861
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700862 for ( ; pos < IPCMNI; pos++) {
863 ipc = idr_find(&ids->ipcs_idr, pos);
864 if (ipc != NULL) {
865 *new_pos = pos + 1;
866 ipc_lock_by_ptr(ipc);
Mike Waychisonae781772005-09-06 15:17:09 -0700867 return ipc;
868 }
869 }
870
871 /* Out of range - return NULL to terminate iteration */
872 return NULL;
873}
874
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700875static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos)
876{
877 struct ipc_proc_iter *iter = s->private;
878 struct ipc_proc_iface *iface = iter->iface;
879 struct kern_ipc_perm *ipc = it;
880
881 /* If we had an ipc id locked before, unlock it */
882 if (ipc && ipc != SEQ_START_TOKEN)
883 ipc_unlock(ipc);
884
Pierre Peiffered2ddbf2008-02-08 04:18:57 -0800885 return sysvipc_find_ipc(&iter->ns->ids[iface->ids], *pos, pos);
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700886}
887
Mike Waychisonae781772005-09-06 15:17:09 -0700888/*
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700889 * File positions: pos 0 -> header, pos n -> ipc id = n - 1.
890 * SeqFile iterator: iterator value locked ipc pointer or SEQ_TOKEN_START.
Mike Waychisonae781772005-09-06 15:17:09 -0700891 */
892static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
893{
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800894 struct ipc_proc_iter *iter = s->private;
895 struct ipc_proc_iface *iface = iter->iface;
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700896 struct ipc_ids *ids;
897
Pierre Peiffered2ddbf2008-02-08 04:18:57 -0800898 ids = &iter->ns->ids[iface->ids];
Mike Waychisonae781772005-09-06 15:17:09 -0700899
900 /*
901 * Take the lock - this will be released by the corresponding
902 * call to stop().
903 */
Nadia Derbey3e148c72007-10-18 23:40:54 -0700904 down_read(&ids->rw_mutex);
Mike Waychisonae781772005-09-06 15:17:09 -0700905
906 /* pos < 0 is invalid */
907 if (*pos < 0)
908 return NULL;
909
910 /* pos == 0 means header */
911 if (*pos == 0)
912 return SEQ_START_TOKEN;
913
914 /* Find the (pos-1)th ipc */
Nadia Derbey7ca7e562007-10-18 23:40:48 -0700915 return sysvipc_find_ipc(ids, *pos - 1, pos);
Mike Waychisonae781772005-09-06 15:17:09 -0700916}
917
918static void sysvipc_proc_stop(struct seq_file *s, void *it)
919{
920 struct kern_ipc_perm *ipc = it;
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800921 struct ipc_proc_iter *iter = s->private;
922 struct ipc_proc_iface *iface = iter->iface;
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700923 struct ipc_ids *ids;
Mike Waychisonae781772005-09-06 15:17:09 -0700924
Nadia Derbeyf4566f02007-10-18 23:40:53 -0700925 /* If we had a locked structure, release it */
Mike Waychisonae781772005-09-06 15:17:09 -0700926 if (ipc && ipc != SEQ_START_TOKEN)
927 ipc_unlock(ipc);
928
Pierre Peiffered2ddbf2008-02-08 04:18:57 -0800929 ids = &iter->ns->ids[iface->ids];
Mike Waychisonae781772005-09-06 15:17:09 -0700930 /* Release the lock we took in start() */
Nadia Derbey3e148c72007-10-18 23:40:54 -0700931 up_read(&ids->rw_mutex);
Mike Waychisonae781772005-09-06 15:17:09 -0700932}
933
934static int sysvipc_proc_show(struct seq_file *s, void *it)
935{
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800936 struct ipc_proc_iter *iter = s->private;
937 struct ipc_proc_iface *iface = iter->iface;
Mike Waychisonae781772005-09-06 15:17:09 -0700938
939 if (it == SEQ_START_TOKEN)
940 return seq_puts(s, iface->header);
941
942 return iface->show(s, it);
943}
944
945static struct seq_operations sysvipc_proc_seqops = {
946 .start = sysvipc_proc_start,
947 .stop = sysvipc_proc_stop,
948 .next = sysvipc_proc_next,
949 .show = sysvipc_proc_show,
950};
951
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800952static int sysvipc_proc_open(struct inode *inode, struct file *file)
953{
Mike Waychisonae781772005-09-06 15:17:09 -0700954 int ret;
955 struct seq_file *seq;
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800956 struct ipc_proc_iter *iter;
957
958 ret = -ENOMEM;
959 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
960 if (!iter)
961 goto out;
Mike Waychisonae781772005-09-06 15:17:09 -0700962
963 ret = seq_open(file, &sysvipc_proc_seqops);
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800964 if (ret)
965 goto out_kfree;
966
967 seq = file->private_data;
968 seq->private = iter;
969
970 iter->iface = PDE(inode)->data;
971 iter->ns = get_ipc_ns(current->nsproxy->ipc_ns);
972out:
Mike Waychisonae781772005-09-06 15:17:09 -0700973 return ret;
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800974out_kfree:
975 kfree(iter);
976 goto out;
977}
978
979static int sysvipc_proc_release(struct inode *inode, struct file *file)
980{
981 struct seq_file *seq = file->private_data;
982 struct ipc_proc_iter *iter = seq->private;
983 put_ipc_ns(iter->ns);
984 return seq_release_private(inode, file);
Mike Waychisonae781772005-09-06 15:17:09 -0700985}
986
Arjan van de Ven9a321442007-02-12 00:55:35 -0800987static const struct file_operations sysvipc_proc_fops = {
Mike Waychisonae781772005-09-06 15:17:09 -0700988 .open = sysvipc_proc_open,
989 .read = seq_read,
990 .llseek = seq_lseek,
Eric W. Biedermanbc1fc6d2007-02-12 00:52:10 -0800991 .release = sysvipc_proc_release,
Mike Waychisonae781772005-09-06 15:17:09 -0700992};
993#endif /* CONFIG_PROC_FS */