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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/ipc/msg.c | |
5a06a363 | 3 | * Copyright (C) 1992 Krishna Balasubramanian |
1da177e4 LT |
4 | * |
5 | * Removed all the remaining kerneld mess | |
6 | * Catch the -EFAULT stuff properly | |
7 | * Use GFP_KERNEL for messages as in 1.2 | |
8 | * Fixed up the unchecked user space derefs | |
9 | * Copyright (C) 1998 Alan Cox & Andi Kleen | |
10 | * | |
11 | * /proc/sysvipc/msg support (c) 1999 Dragos Acostachioaie <dragos@iname.com> | |
12 | * | |
13 | * mostly rewritten, threaded and wake-one semantics added | |
14 | * MSGMAX limit removed, sysctl's added | |
624dffcb | 15 | * (c) 1999 Manfred Spraul <manfred@colorfullife.com> |
073115d6 SG |
16 | * |
17 | * support for audit of ipc object properties and permission changes | |
18 | * Dustin Kirkland <dustin.kirkland@us.ibm.com> | |
1e786937 KK |
19 | * |
20 | * namespaces support | |
21 | * OpenVZ, SWsoft Inc. | |
22 | * Pavel Emelianov <xemul@openvz.org> | |
1da177e4 LT |
23 | */ |
24 | ||
c59ede7b | 25 | #include <linux/capability.h> |
1da177e4 LT |
26 | #include <linux/msg.h> |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/init.h> | |
f7bf3df8 | 29 | #include <linux/mm.h> |
1da177e4 LT |
30 | #include <linux/proc_fs.h> |
31 | #include <linux/list.h> | |
32 | #include <linux/security.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/syscalls.h> | |
35 | #include <linux/audit.h> | |
19b4946c | 36 | #include <linux/seq_file.h> |
3e148c79 | 37 | #include <linux/rwsem.h> |
1e786937 | 38 | #include <linux/nsproxy.h> |
ae5e1b22 | 39 | #include <linux/ipc_namespace.h> |
5f921ae9 | 40 | |
1da177e4 | 41 | #include <asm/current.h> |
7153e402 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | #include "util.h" |
44 | ||
4bb6657d | 45 | /* one msg_receiver structure for each sleeping receiver */ |
1da177e4 | 46 | struct msg_receiver { |
5a06a363 IM |
47 | struct list_head r_list; |
48 | struct task_struct *r_tsk; | |
1da177e4 | 49 | |
5a06a363 IM |
50 | int r_mode; |
51 | long r_msgtype; | |
52 | long r_maxsize; | |
1da177e4 | 53 | |
ee51636c | 54 | struct msg_msg *r_msg; |
1da177e4 LT |
55 | }; |
56 | ||
57 | /* one msg_sender for each sleeping sender */ | |
58 | struct msg_sender { | |
5a06a363 IM |
59 | struct list_head list; |
60 | struct task_struct *tsk; | |
1da177e4 LT |
61 | }; |
62 | ||
63 | #define SEARCH_ANY 1 | |
64 | #define SEARCH_EQUAL 2 | |
65 | #define SEARCH_NOTEQUAL 3 | |
66 | #define SEARCH_LESSEQUAL 4 | |
8ac6ed58 | 67 | #define SEARCH_NUMBER 5 |
1da177e4 | 68 | |
ed2ddbf8 | 69 | #define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS]) |
1da177e4 | 70 | |
a5001a0d DB |
71 | static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id) |
72 | { | |
55b7ae50 | 73 | struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&msg_ids(ns), id); |
a5001a0d DB |
74 | |
75 | if (IS_ERR(ipcp)) | |
76 | return ERR_CAST(ipcp); | |
77 | ||
78 | return container_of(ipcp, struct msg_queue, q_perm); | |
79 | } | |
80 | ||
81 | static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns, | |
82 | int id) | |
83 | { | |
84 | struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id); | |
85 | ||
86 | if (IS_ERR(ipcp)) | |
87 | return ERR_CAST(ipcp); | |
88 | ||
89 | return container_of(ipcp, struct msg_queue, q_perm); | |
90 | } | |
91 | ||
7ca7e564 ND |
92 | static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s) |
93 | { | |
94 | ipc_rmid(&msg_ids(ns), &s->q_perm); | |
95 | } | |
96 | ||
53dad6d3 DB |
97 | static void msg_rcu_free(struct rcu_head *head) |
98 | { | |
99 | struct ipc_rcu *p = container_of(head, struct ipc_rcu, rcu); | |
100 | struct msg_queue *msq = ipc_rcu_to_struct(p); | |
101 | ||
102 | security_msg_queue_free(msq); | |
103 | ipc_rcu_free(head); | |
104 | } | |
105 | ||
f4566f04 ND |
106 | /** |
107 | * newque - Create a new msg queue | |
108 | * @ns: namespace | |
109 | * @params: ptr to the structure that contains the key and msgflg | |
110 | * | |
d9a605e4 | 111 | * Called with msg_ids.rwsem held (writer) |
f4566f04 | 112 | */ |
7748dbfa | 113 | static int newque(struct ipc_namespace *ns, struct ipc_params *params) |
1da177e4 | 114 | { |
1da177e4 | 115 | struct msg_queue *msq; |
5a06a363 | 116 | int id, retval; |
7748dbfa ND |
117 | key_t key = params->key; |
118 | int msgflg = params->flg; | |
1da177e4 | 119 | |
5a06a363 IM |
120 | msq = ipc_rcu_alloc(sizeof(*msq)); |
121 | if (!msq) | |
1da177e4 LT |
122 | return -ENOMEM; |
123 | ||
5a06a363 | 124 | msq->q_perm.mode = msgflg & S_IRWXUGO; |
1da177e4 LT |
125 | msq->q_perm.key = key; |
126 | ||
127 | msq->q_perm.security = NULL; | |
128 | retval = security_msg_queue_alloc(msq); | |
129 | if (retval) { | |
53dad6d3 | 130 | ipc_rcu_putref(msq, ipc_rcu_free); |
1da177e4 LT |
131 | return retval; |
132 | } | |
133 | ||
1da177e4 LT |
134 | msq->q_stime = msq->q_rtime = 0; |
135 | msq->q_ctime = get_seconds(); | |
136 | msq->q_cbytes = msq->q_qnum = 0; | |
1e786937 | 137 | msq->q_qbytes = ns->msg_ctlmnb; |
1da177e4 LT |
138 | msq->q_lspid = msq->q_lrpid = 0; |
139 | INIT_LIST_HEAD(&msq->q_messages); | |
140 | INIT_LIST_HEAD(&msq->q_receivers); | |
141 | INIT_LIST_HEAD(&msq->q_senders); | |
7ca7e564 | 142 | |
b9a53227 LT |
143 | /* ipc_addid() locks msq upon success. */ |
144 | id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni); | |
145 | if (id < 0) { | |
146 | ipc_rcu_putref(msq, msg_rcu_free); | |
147 | return id; | |
148 | } | |
149 | ||
cf9d5d78 | 150 | ipc_unlock_object(&msq->q_perm); |
dbfcd91f | 151 | rcu_read_unlock(); |
1da177e4 | 152 | |
7ca7e564 | 153 | return msq->q_perm.id; |
1da177e4 LT |
154 | } |
155 | ||
5a06a363 | 156 | static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss) |
1da177e4 | 157 | { |
5a06a363 | 158 | mss->tsk = current; |
f75a2f35 | 159 | __set_current_state(TASK_INTERRUPTIBLE); |
5a06a363 | 160 | list_add_tail(&mss->list, &msq->q_senders); |
1da177e4 LT |
161 | } |
162 | ||
5a06a363 | 163 | static inline void ss_del(struct msg_sender *mss) |
1da177e4 | 164 | { |
5a06a363 | 165 | if (mss->list.next != NULL) |
1da177e4 LT |
166 | list_del(&mss->list); |
167 | } | |
168 | ||
e3658538 DB |
169 | static void ss_wakeup(struct list_head *h, |
170 | struct wake_q_head *wake_q, int kill) | |
1da177e4 | 171 | { |
41239fe8 | 172 | struct msg_sender *mss, *t; |
1da177e4 | 173 | |
41239fe8 | 174 | list_for_each_entry_safe(mss, t, h, list) { |
5a06a363 IM |
175 | if (kill) |
176 | mss->list.next = NULL; | |
e3658538 | 177 | wake_q_add(wake_q, mss->tsk); |
1da177e4 LT |
178 | } |
179 | } | |
180 | ||
ee51636c SAS |
181 | static void expunge_all(struct msg_queue *msq, int res, |
182 | struct wake_q_head *wake_q) | |
1da177e4 | 183 | { |
41239fe8 | 184 | struct msg_receiver *msr, *t; |
5a06a363 | 185 | |
41239fe8 | 186 | list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { |
ee51636c SAS |
187 | wake_q_add(wake_q, msr->r_tsk); |
188 | WRITE_ONCE(msr->r_msg, ERR_PTR(res)); | |
1da177e4 LT |
189 | } |
190 | } | |
5a06a363 IM |
191 | |
192 | /* | |
193 | * freeque() wakes up waiters on the sender and receiver waiting queue, | |
f4566f04 ND |
194 | * removes the message queue from message queue ID IDR, and cleans up all the |
195 | * messages associated with this queue. | |
1da177e4 | 196 | * |
d9a605e4 DB |
197 | * msg_ids.rwsem (writer) and the spinlock for this message queue are held |
198 | * before freeque() is called. msg_ids.rwsem remains locked on exit. | |
1da177e4 | 199 | */ |
01b8b07a | 200 | static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) |
1da177e4 | 201 | { |
41239fe8 | 202 | struct msg_msg *msg, *t; |
01b8b07a | 203 | struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); |
ee51636c | 204 | WAKE_Q(wake_q); |
1da177e4 | 205 | |
ee51636c | 206 | expunge_all(msq, -EIDRM, &wake_q); |
e3658538 | 207 | ss_wakeup(&msq->q_senders, &wake_q, 1); |
7ca7e564 | 208 | msg_rmid(ns, msq); |
4718787d | 209 | ipc_unlock_object(&msq->q_perm); |
ee51636c | 210 | wake_up_q(&wake_q); |
4718787d | 211 | rcu_read_unlock(); |
5a06a363 | 212 | |
41239fe8 | 213 | list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) { |
3ac88a41 | 214 | atomic_dec(&ns->msg_hdrs); |
1da177e4 LT |
215 | free_msg(msg); |
216 | } | |
3ac88a41 | 217 | atomic_sub(msq->q_cbytes, &ns->msg_bytes); |
53dad6d3 | 218 | ipc_rcu_putref(msq, msg_rcu_free); |
1da177e4 LT |
219 | } |
220 | ||
f4566f04 | 221 | /* |
d9a605e4 | 222 | * Called with msg_ids.rwsem and ipcp locked. |
f4566f04 | 223 | */ |
03f02c76 | 224 | static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg) |
7748dbfa | 225 | { |
03f02c76 ND |
226 | struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); |
227 | ||
228 | return security_msg_queue_associate(msq, msgflg); | |
7748dbfa ND |
229 | } |
230 | ||
e48fbb69 | 231 | SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg) |
1da177e4 | 232 | { |
1e786937 | 233 | struct ipc_namespace *ns; |
eb66ec44 MK |
234 | static const struct ipc_ops msg_ops = { |
235 | .getnew = newque, | |
236 | .associate = msg_security, | |
237 | }; | |
7748dbfa | 238 | struct ipc_params msg_params; |
1e786937 KK |
239 | |
240 | ns = current->nsproxy->ipc_ns; | |
7ca7e564 | 241 | |
7748dbfa ND |
242 | msg_params.key = key; |
243 | msg_params.flg = msgflg; | |
5a06a363 | 244 | |
7748dbfa | 245 | return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params); |
1da177e4 LT |
246 | } |
247 | ||
5a06a363 IM |
248 | static inline unsigned long |
249 | copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version) | |
1da177e4 | 250 | { |
239521f3 | 251 | switch (version) { |
1da177e4 | 252 | case IPC_64: |
5a06a363 | 253 | return copy_to_user(buf, in, sizeof(*in)); |
1da177e4 | 254 | case IPC_OLD: |
5a06a363 | 255 | { |
1da177e4 LT |
256 | struct msqid_ds out; |
257 | ||
5a06a363 | 258 | memset(&out, 0, sizeof(out)); |
1da177e4 LT |
259 | |
260 | ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm); | |
261 | ||
262 | out.msg_stime = in->msg_stime; | |
263 | out.msg_rtime = in->msg_rtime; | |
264 | out.msg_ctime = in->msg_ctime; | |
265 | ||
4be929be AD |
266 | if (in->msg_cbytes > USHRT_MAX) |
267 | out.msg_cbytes = USHRT_MAX; | |
1da177e4 LT |
268 | else |
269 | out.msg_cbytes = in->msg_cbytes; | |
270 | out.msg_lcbytes = in->msg_cbytes; | |
271 | ||
4be929be AD |
272 | if (in->msg_qnum > USHRT_MAX) |
273 | out.msg_qnum = USHRT_MAX; | |
1da177e4 LT |
274 | else |
275 | out.msg_qnum = in->msg_qnum; | |
276 | ||
4be929be AD |
277 | if (in->msg_qbytes > USHRT_MAX) |
278 | out.msg_qbytes = USHRT_MAX; | |
1da177e4 LT |
279 | else |
280 | out.msg_qbytes = in->msg_qbytes; | |
281 | out.msg_lqbytes = in->msg_qbytes; | |
282 | ||
283 | out.msg_lspid = in->msg_lspid; | |
284 | out.msg_lrpid = in->msg_lrpid; | |
285 | ||
5a06a363 IM |
286 | return copy_to_user(buf, &out, sizeof(out)); |
287 | } | |
1da177e4 LT |
288 | default: |
289 | return -EINVAL; | |
290 | } | |
291 | } | |
292 | ||
5a06a363 | 293 | static inline unsigned long |
016d7132 | 294 | copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version) |
1da177e4 | 295 | { |
239521f3 | 296 | switch (version) { |
1da177e4 | 297 | case IPC_64: |
016d7132 | 298 | if (copy_from_user(out, buf, sizeof(*out))) |
1da177e4 | 299 | return -EFAULT; |
1da177e4 | 300 | return 0; |
1da177e4 | 301 | case IPC_OLD: |
5a06a363 | 302 | { |
1da177e4 LT |
303 | struct msqid_ds tbuf_old; |
304 | ||
5a06a363 | 305 | if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) |
1da177e4 LT |
306 | return -EFAULT; |
307 | ||
239521f3 MS |
308 | out->msg_perm.uid = tbuf_old.msg_perm.uid; |
309 | out->msg_perm.gid = tbuf_old.msg_perm.gid; | |
310 | out->msg_perm.mode = tbuf_old.msg_perm.mode; | |
1da177e4 | 311 | |
5a06a363 | 312 | if (tbuf_old.msg_qbytes == 0) |
016d7132 | 313 | out->msg_qbytes = tbuf_old.msg_lqbytes; |
1da177e4 | 314 | else |
016d7132 | 315 | out->msg_qbytes = tbuf_old.msg_qbytes; |
1da177e4 LT |
316 | |
317 | return 0; | |
5a06a363 | 318 | } |
1da177e4 LT |
319 | default: |
320 | return -EINVAL; | |
321 | } | |
322 | } | |
323 | ||
a0d092fc | 324 | /* |
d9a605e4 | 325 | * This function handles some msgctl commands which require the rwsem |
a0d092fc | 326 | * to be held in write mode. |
d9a605e4 | 327 | * NOTE: no locks must be held, the rwsem is taken inside this function. |
a0d092fc PP |
328 | */ |
329 | static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, | |
330 | struct msqid_ds __user *buf, int version) | |
1da177e4 | 331 | { |
1da177e4 | 332 | struct kern_ipc_perm *ipcp; |
f1970c48 | 333 | struct msqid64_ds uninitialized_var(msqid64); |
a0d092fc PP |
334 | struct msg_queue *msq; |
335 | int err; | |
336 | ||
337 | if (cmd == IPC_SET) { | |
016d7132 | 338 | if (copy_msqid_from_user(&msqid64, buf, version)) |
a0d092fc PP |
339 | return -EFAULT; |
340 | } | |
341 | ||
d9a605e4 | 342 | down_write(&msg_ids(ns).rwsem); |
7b4cc5d8 DB |
343 | rcu_read_lock(); |
344 | ||
15724ecb DB |
345 | ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd, |
346 | &msqid64.msg_perm, msqid64.msg_qbytes); | |
7b4cc5d8 DB |
347 | if (IS_ERR(ipcp)) { |
348 | err = PTR_ERR(ipcp); | |
7b4cc5d8 DB |
349 | goto out_unlock1; |
350 | } | |
a0d092fc | 351 | |
a5f75e7f | 352 | msq = container_of(ipcp, struct msg_queue, q_perm); |
a0d092fc PP |
353 | |
354 | err = security_msg_queue_msgctl(msq, cmd); | |
355 | if (err) | |
15724ecb | 356 | goto out_unlock1; |
a0d092fc PP |
357 | |
358 | switch (cmd) { | |
359 | case IPC_RMID: | |
15724ecb | 360 | ipc_lock_object(&msq->q_perm); |
7b4cc5d8 | 361 | /* freeque unlocks the ipc object and rcu */ |
a0d092fc PP |
362 | freeque(ns, ipcp); |
363 | goto out_up; | |
364 | case IPC_SET: | |
e3658538 DB |
365 | { |
366 | WAKE_Q(wake_q); | |
367 | ||
016d7132 | 368 | if (msqid64.msg_qbytes > ns->msg_ctlmnb && |
a0d092fc PP |
369 | !capable(CAP_SYS_RESOURCE)) { |
370 | err = -EPERM; | |
15724ecb | 371 | goto out_unlock1; |
a0d092fc PP |
372 | } |
373 | ||
15724ecb | 374 | ipc_lock_object(&msq->q_perm); |
1efdb69b EB |
375 | err = ipc_update_perm(&msqid64.msg_perm, ipcp); |
376 | if (err) | |
7b4cc5d8 | 377 | goto out_unlock0; |
1efdb69b | 378 | |
016d7132 | 379 | msq->q_qbytes = msqid64.msg_qbytes; |
a0d092fc | 380 | |
a0d092fc | 381 | msq->q_ctime = get_seconds(); |
e3658538 DB |
382 | /* |
383 | * Sleeping receivers might be excluded by | |
a0d092fc PP |
384 | * stricter permissions. |
385 | */ | |
ee51636c | 386 | expunge_all(msq, -EAGAIN, &wake_q); |
e3658538 DB |
387 | /* |
388 | * Sleeping senders might be able to send | |
a0d092fc PP |
389 | * due to a larger queue size. |
390 | */ | |
e3658538 DB |
391 | ss_wakeup(&msq->q_senders, &wake_q, 0); |
392 | ipc_unlock_object(&msq->q_perm); | |
393 | wake_up_q(&wake_q); | |
394 | ||
395 | goto out_unlock1; | |
396 | } | |
a0d092fc PP |
397 | default: |
398 | err = -EINVAL; | |
15724ecb | 399 | goto out_unlock1; |
a0d092fc | 400 | } |
7b4cc5d8 DB |
401 | |
402 | out_unlock0: | |
403 | ipc_unlock_object(&msq->q_perm); | |
404 | out_unlock1: | |
405 | rcu_read_unlock(); | |
a0d092fc | 406 | out_up: |
d9a605e4 | 407 | up_write(&msg_ids(ns).rwsem); |
a0d092fc PP |
408 | return err; |
409 | } | |
410 | ||
2cafed30 DB |
411 | static int msgctl_nolock(struct ipc_namespace *ns, int msqid, |
412 | int cmd, int version, void __user *buf) | |
a0d092fc | 413 | { |
2cafed30 | 414 | int err; |
5a06a363 | 415 | struct msg_queue *msq; |
1da177e4 LT |
416 | |
417 | switch (cmd) { | |
5a06a363 IM |
418 | case IPC_INFO: |
419 | case MSG_INFO: | |
420 | { | |
1da177e4 LT |
421 | struct msginfo msginfo; |
422 | int max_id; | |
5a06a363 | 423 | |
1da177e4 LT |
424 | if (!buf) |
425 | return -EFAULT; | |
2cafed30 | 426 | |
5a06a363 IM |
427 | /* |
428 | * We must not return kernel stack data. | |
1da177e4 LT |
429 | * due to padding, it's not enough |
430 | * to set all member fields. | |
431 | */ | |
1da177e4 LT |
432 | err = security_msg_queue_msgctl(NULL, cmd); |
433 | if (err) | |
434 | return err; | |
435 | ||
5a06a363 | 436 | memset(&msginfo, 0, sizeof(msginfo)); |
1e786937 KK |
437 | msginfo.msgmni = ns->msg_ctlmni; |
438 | msginfo.msgmax = ns->msg_ctlmax; | |
439 | msginfo.msgmnb = ns->msg_ctlmnb; | |
1da177e4 LT |
440 | msginfo.msgssz = MSGSSZ; |
441 | msginfo.msgseg = MSGSEG; | |
d9a605e4 | 442 | down_read(&msg_ids(ns).rwsem); |
1da177e4 | 443 | if (cmd == MSG_INFO) { |
1e786937 | 444 | msginfo.msgpool = msg_ids(ns).in_use; |
3ac88a41 KK |
445 | msginfo.msgmap = atomic_read(&ns->msg_hdrs); |
446 | msginfo.msgtql = atomic_read(&ns->msg_bytes); | |
1da177e4 LT |
447 | } else { |
448 | msginfo.msgmap = MSGMAP; | |
449 | msginfo.msgpool = MSGPOOL; | |
450 | msginfo.msgtql = MSGTQL; | |
451 | } | |
7ca7e564 | 452 | max_id = ipc_get_maxid(&msg_ids(ns)); |
d9a605e4 | 453 | up_read(&msg_ids(ns).rwsem); |
5a06a363 | 454 | if (copy_to_user(buf, &msginfo, sizeof(struct msginfo))) |
1da177e4 | 455 | return -EFAULT; |
5a06a363 | 456 | return (max_id < 0) ? 0 : max_id; |
1da177e4 | 457 | } |
2cafed30 DB |
458 | |
459 | case MSG_STAT: | |
1da177e4 LT |
460 | case IPC_STAT: |
461 | { | |
462 | struct msqid64_ds tbuf; | |
463 | int success_return; | |
5a06a363 | 464 | |
1da177e4 LT |
465 | if (!buf) |
466 | return -EFAULT; | |
1da177e4 | 467 | |
ac0ba20e DB |
468 | memset(&tbuf, 0, sizeof(tbuf)); |
469 | ||
470 | rcu_read_lock(); | |
5a06a363 | 471 | if (cmd == MSG_STAT) { |
ac0ba20e DB |
472 | msq = msq_obtain_object(ns, msqid); |
473 | if (IS_ERR(msq)) { | |
474 | err = PTR_ERR(msq); | |
475 | goto out_unlock; | |
476 | } | |
7ca7e564 | 477 | success_return = msq->q_perm.id; |
1da177e4 | 478 | } else { |
ac0ba20e DB |
479 | msq = msq_obtain_object_check(ns, msqid); |
480 | if (IS_ERR(msq)) { | |
481 | err = PTR_ERR(msq); | |
482 | goto out_unlock; | |
483 | } | |
1da177e4 LT |
484 | success_return = 0; |
485 | } | |
ac0ba20e | 486 | |
1da177e4 | 487 | err = -EACCES; |
b0e77598 | 488 | if (ipcperms(ns, &msq->q_perm, S_IRUGO)) |
1da177e4 LT |
489 | goto out_unlock; |
490 | ||
491 | err = security_msg_queue_msgctl(msq, cmd); | |
492 | if (err) | |
493 | goto out_unlock; | |
494 | ||
495 | kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm); | |
496 | tbuf.msg_stime = msq->q_stime; | |
497 | tbuf.msg_rtime = msq->q_rtime; | |
498 | tbuf.msg_ctime = msq->q_ctime; | |
499 | tbuf.msg_cbytes = msq->q_cbytes; | |
500 | tbuf.msg_qnum = msq->q_qnum; | |
501 | tbuf.msg_qbytes = msq->q_qbytes; | |
502 | tbuf.msg_lspid = msq->q_lspid; | |
503 | tbuf.msg_lrpid = msq->q_lrpid; | |
ac0ba20e DB |
504 | rcu_read_unlock(); |
505 | ||
1da177e4 LT |
506 | if (copy_msqid_to_user(buf, &tbuf, version)) |
507 | return -EFAULT; | |
508 | return success_return; | |
509 | } | |
2cafed30 | 510 | |
1da177e4 | 511 | default: |
2cafed30 | 512 | return -EINVAL; |
1da177e4 LT |
513 | } |
514 | ||
2cafed30 | 515 | return err; |
1da177e4 | 516 | out_unlock: |
ac0ba20e | 517 | rcu_read_unlock(); |
1da177e4 LT |
518 | return err; |
519 | } | |
520 | ||
2cafed30 DB |
521 | SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf) |
522 | { | |
523 | int version; | |
524 | struct ipc_namespace *ns; | |
525 | ||
526 | if (msqid < 0 || cmd < 0) | |
527 | return -EINVAL; | |
528 | ||
529 | version = ipc_parse_version(&cmd); | |
530 | ns = current->nsproxy->ipc_ns; | |
531 | ||
532 | switch (cmd) { | |
533 | case IPC_INFO: | |
534 | case MSG_INFO: | |
535 | case MSG_STAT: /* msqid is an index rather than a msg queue id */ | |
536 | case IPC_STAT: | |
537 | return msgctl_nolock(ns, msqid, cmd, version, buf); | |
538 | case IPC_SET: | |
539 | case IPC_RMID: | |
540 | return msgctl_down(ns, msqid, cmd, buf, version); | |
541 | default: | |
542 | return -EINVAL; | |
543 | } | |
544 | } | |
545 | ||
5a06a363 | 546 | static int testmsg(struct msg_msg *msg, long type, int mode) |
1da177e4 | 547 | { |
46c0a8ca PM |
548 | switch (mode) { |
549 | case SEARCH_ANY: | |
550 | case SEARCH_NUMBER: | |
551 | return 1; | |
552 | case SEARCH_LESSEQUAL: | |
553 | if (msg->m_type <= type) | |
554 | return 1; | |
555 | break; | |
556 | case SEARCH_EQUAL: | |
557 | if (msg->m_type == type) | |
1da177e4 | 558 | return 1; |
46c0a8ca PM |
559 | break; |
560 | case SEARCH_NOTEQUAL: | |
561 | if (msg->m_type != type) | |
562 | return 1; | |
563 | break; | |
1da177e4 LT |
564 | } |
565 | return 0; | |
566 | } | |
567 | ||
ee51636c SAS |
568 | static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg, |
569 | struct wake_q_head *wake_q) | |
1da177e4 | 570 | { |
41239fe8 | 571 | struct msg_receiver *msr, *t; |
5a06a363 | 572 | |
41239fe8 | 573 | list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { |
5a06a363 IM |
574 | if (testmsg(msg, msr->r_msgtype, msr->r_mode) && |
575 | !security_msg_queue_msgrcv(msq, msg, msr->r_tsk, | |
576 | msr->r_msgtype, msr->r_mode)) { | |
577 | ||
1da177e4 | 578 | list_del(&msr->r_list); |
5a06a363 | 579 | if (msr->r_maxsize < msg->m_ts) { |
ee51636c SAS |
580 | wake_q_add(wake_q, msr->r_tsk); |
581 | WRITE_ONCE(msr->r_msg, ERR_PTR(-E2BIG)); | |
1da177e4 | 582 | } else { |
b488893a | 583 | msq->q_lrpid = task_pid_vnr(msr->r_tsk); |
1da177e4 | 584 | msq->q_rtime = get_seconds(); |
5a06a363 | 585 | |
ee51636c SAS |
586 | wake_q_add(wake_q, msr->r_tsk); |
587 | WRITE_ONCE(msr->r_msg, msg); | |
1da177e4 LT |
588 | return 1; |
589 | } | |
590 | } | |
591 | } | |
ffa571da | 592 | |
1da177e4 LT |
593 | return 0; |
594 | } | |
595 | ||
651971cb | 596 | long do_msgsnd(int msqid, long mtype, void __user *mtext, |
597 | size_t msgsz, int msgflg) | |
1da177e4 LT |
598 | { |
599 | struct msg_queue *msq; | |
600 | struct msg_msg *msg; | |
1da177e4 | 601 | int err; |
1e786937 | 602 | struct ipc_namespace *ns; |
ee51636c | 603 | WAKE_Q(wake_q); |
1e786937 KK |
604 | |
605 | ns = current->nsproxy->ipc_ns; | |
5a06a363 | 606 | |
1e786937 | 607 | if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0) |
1da177e4 | 608 | return -EINVAL; |
1da177e4 LT |
609 | if (mtype < 1) |
610 | return -EINVAL; | |
611 | ||
651971cb | 612 | msg = load_msg(mtext, msgsz); |
5a06a363 | 613 | if (IS_ERR(msg)) |
1da177e4 LT |
614 | return PTR_ERR(msg); |
615 | ||
616 | msg->m_type = mtype; | |
617 | msg->m_ts = msgsz; | |
618 | ||
3dd1f784 DB |
619 | rcu_read_lock(); |
620 | msq = msq_obtain_object_check(ns, msqid); | |
023a5355 ND |
621 | if (IS_ERR(msq)) { |
622 | err = PTR_ERR(msq); | |
3dd1f784 | 623 | goto out_unlock1; |
023a5355 | 624 | } |
1da177e4 | 625 | |
bebcb928 MS |
626 | ipc_lock_object(&msq->q_perm); |
627 | ||
1da177e4 LT |
628 | for (;;) { |
629 | struct msg_sender s; | |
630 | ||
5a06a363 | 631 | err = -EACCES; |
b0e77598 | 632 | if (ipcperms(ns, &msq->q_perm, S_IWUGO)) |
bebcb928 | 633 | goto out_unlock0; |
1da177e4 | 634 | |
4271b05a | 635 | /* raced with RMID? */ |
0f3d2b01 | 636 | if (!ipc_valid_object(&msq->q_perm)) { |
4271b05a DB |
637 | err = -EIDRM; |
638 | goto out_unlock0; | |
639 | } | |
640 | ||
1da177e4 LT |
641 | err = security_msg_queue_msgsnd(msq, msg, msgflg); |
642 | if (err) | |
bebcb928 | 643 | goto out_unlock0; |
1da177e4 | 644 | |
5a06a363 | 645 | if (msgsz + msq->q_cbytes <= msq->q_qbytes && |
1da177e4 LT |
646 | 1 + msq->q_qnum <= msq->q_qbytes) { |
647 | break; | |
648 | } | |
649 | ||
650 | /* queue full, wait: */ | |
5a06a363 IM |
651 | if (msgflg & IPC_NOWAIT) { |
652 | err = -EAGAIN; | |
bebcb928 | 653 | goto out_unlock0; |
1da177e4 | 654 | } |
3dd1f784 | 655 | |
ffa571da | 656 | /* enqueue the sender and prepare to block */ |
1da177e4 | 657 | ss_add(msq, &s); |
6062a8dc RR |
658 | |
659 | if (!ipc_rcu_getref(msq)) { | |
660 | err = -EIDRM; | |
3dd1f784 | 661 | goto out_unlock0; |
6062a8dc RR |
662 | } |
663 | ||
3dd1f784 DB |
664 | ipc_unlock_object(&msq->q_perm); |
665 | rcu_read_unlock(); | |
1da177e4 LT |
666 | schedule(); |
667 | ||
3dd1f784 DB |
668 | rcu_read_lock(); |
669 | ipc_lock_object(&msq->q_perm); | |
670 | ||
9b24fef9 | 671 | ipc_rcu_putref(msq, msg_rcu_free); |
0f3d2b01 RA |
672 | /* raced with RMID? */ |
673 | if (!ipc_valid_object(&msq->q_perm)) { | |
1da177e4 | 674 | err = -EIDRM; |
3dd1f784 | 675 | goto out_unlock0; |
1da177e4 LT |
676 | } |
677 | ss_del(&s); | |
5a06a363 | 678 | |
1da177e4 | 679 | if (signal_pending(current)) { |
5a06a363 | 680 | err = -ERESTARTNOHAND; |
3dd1f784 | 681 | goto out_unlock0; |
1da177e4 | 682 | } |
3dd1f784 | 683 | |
1da177e4 | 684 | } |
b488893a | 685 | msq->q_lspid = task_tgid_vnr(current); |
1da177e4 LT |
686 | msq->q_stime = get_seconds(); |
687 | ||
ee51636c | 688 | if (!pipelined_send(msq, msg, &wake_q)) { |
25985edc | 689 | /* no one is waiting for this message, enqueue it */ |
5a06a363 | 690 | list_add_tail(&msg->m_list, &msq->q_messages); |
1da177e4 LT |
691 | msq->q_cbytes += msgsz; |
692 | msq->q_qnum++; | |
3ac88a41 KK |
693 | atomic_add(msgsz, &ns->msg_bytes); |
694 | atomic_inc(&ns->msg_hdrs); | |
1da177e4 | 695 | } |
5a06a363 | 696 | |
1da177e4 LT |
697 | err = 0; |
698 | msg = NULL; | |
699 | ||
3dd1f784 DB |
700 | out_unlock0: |
701 | ipc_unlock_object(&msq->q_perm); | |
ee51636c | 702 | wake_up_q(&wake_q); |
3dd1f784 DB |
703 | out_unlock1: |
704 | rcu_read_unlock(); | |
5a06a363 | 705 | if (msg != NULL) |
1da177e4 LT |
706 | free_msg(msg); |
707 | return err; | |
708 | } | |
709 | ||
e48fbb69 HC |
710 | SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, |
711 | int, msgflg) | |
651971cb | 712 | { |
713 | long mtype; | |
714 | ||
715 | if (get_user(mtype, &msgp->mtype)) | |
716 | return -EFAULT; | |
717 | return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg); | |
718 | } | |
719 | ||
5a06a363 | 720 | static inline int convert_mode(long *msgtyp, int msgflg) |
1da177e4 | 721 | { |
8ac6ed58 PH |
722 | if (msgflg & MSG_COPY) |
723 | return SEARCH_NUMBER; | |
5a06a363 | 724 | /* |
1da177e4 LT |
725 | * find message of correct type. |
726 | * msgtyp = 0 => get first. | |
727 | * msgtyp > 0 => get first message of matching type. | |
5a06a363 | 728 | * msgtyp < 0 => get message with least type must be < abs(msgtype). |
1da177e4 | 729 | */ |
5a06a363 | 730 | if (*msgtyp == 0) |
1da177e4 | 731 | return SEARCH_ANY; |
5a06a363 IM |
732 | if (*msgtyp < 0) { |
733 | *msgtyp = -*msgtyp; | |
1da177e4 LT |
734 | return SEARCH_LESSEQUAL; |
735 | } | |
5a06a363 | 736 | if (msgflg & MSG_EXCEPT) |
1da177e4 LT |
737 | return SEARCH_NOTEQUAL; |
738 | return SEARCH_EQUAL; | |
739 | } | |
740 | ||
f9dd87f4 SK |
741 | static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) |
742 | { | |
743 | struct msgbuf __user *msgp = dest; | |
744 | size_t msgsz; | |
745 | ||
746 | if (put_user(msg->m_type, &msgp->mtype)) | |
747 | return -EFAULT; | |
748 | ||
749 | msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; | |
750 | if (store_msg(msgp->mtext, msg, msgsz)) | |
751 | return -EFAULT; | |
752 | return msgsz; | |
753 | } | |
754 | ||
4a674f34 | 755 | #ifdef CONFIG_CHECKPOINT_RESTORE |
3fcfe786 SK |
756 | /* |
757 | * This function creates new kernel message structure, large enough to store | |
758 | * bufsz message bytes. | |
759 | */ | |
8ac6ed58 | 760 | static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) |
4a674f34 SK |
761 | { |
762 | struct msg_msg *copy; | |
763 | ||
4a674f34 SK |
764 | /* |
765 | * Create dummy message to copy real message to. | |
766 | */ | |
767 | copy = load_msg(buf, bufsz); | |
768 | if (!IS_ERR(copy)) | |
769 | copy->m_ts = bufsz; | |
770 | return copy; | |
771 | } | |
772 | ||
85398aa8 | 773 | static inline void free_copy(struct msg_msg *copy) |
4a674f34 | 774 | { |
85398aa8 | 775 | if (copy) |
4a674f34 SK |
776 | free_msg(copy); |
777 | } | |
778 | #else | |
8ac6ed58 | 779 | static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) |
b30efe27 SK |
780 | { |
781 | return ERR_PTR(-ENOSYS); | |
782 | } | |
783 | ||
85398aa8 SK |
784 | static inline void free_copy(struct msg_msg *copy) |
785 | { | |
786 | } | |
4a674f34 SK |
787 | #endif |
788 | ||
daaf74cf PH |
789 | static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode) |
790 | { | |
368ae537 | 791 | struct msg_msg *msg, *found = NULL; |
daaf74cf PH |
792 | long count = 0; |
793 | ||
794 | list_for_each_entry(msg, &msq->q_messages, m_list) { | |
795 | if (testmsg(msg, *msgtyp, mode) && | |
796 | !security_msg_queue_msgrcv(msq, msg, current, | |
797 | *msgtyp, mode)) { | |
798 | if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) { | |
799 | *msgtyp = msg->m_type - 1; | |
368ae537 | 800 | found = msg; |
daaf74cf PH |
801 | } else if (mode == SEARCH_NUMBER) { |
802 | if (*msgtyp == count) | |
803 | return msg; | |
804 | } else | |
805 | return msg; | |
806 | count++; | |
807 | } | |
808 | } | |
809 | ||
368ae537 | 810 | return found ?: ERR_PTR(-EAGAIN); |
daaf74cf PH |
811 | } |
812 | ||
41a0d523 | 813 | long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg, |
f9dd87f4 | 814 | long (*msg_handler)(void __user *, struct msg_msg *, size_t)) |
1da177e4 | 815 | { |
1da177e4 | 816 | int mode; |
41a0d523 | 817 | struct msg_queue *msq; |
1e786937 | 818 | struct ipc_namespace *ns; |
41a0d523 | 819 | struct msg_msg *msg, *copy = NULL; |
e3658538 | 820 | WAKE_Q(wake_q); |
1da177e4 | 821 | |
88b9e456 PH |
822 | ns = current->nsproxy->ipc_ns; |
823 | ||
f9dd87f4 | 824 | if (msqid < 0 || (long) bufsz < 0) |
1da177e4 | 825 | return -EINVAL; |
41a0d523 | 826 | |
4a674f34 | 827 | if (msgflg & MSG_COPY) { |
4f87dac3 MK |
828 | if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT)) |
829 | return -EINVAL; | |
8ac6ed58 | 830 | copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax)); |
4a674f34 SK |
831 | if (IS_ERR(copy)) |
832 | return PTR_ERR(copy); | |
833 | } | |
5a06a363 | 834 | mode = convert_mode(&msgtyp, msgflg); |
1da177e4 | 835 | |
41a0d523 DB |
836 | rcu_read_lock(); |
837 | msq = msq_obtain_object_check(ns, msqid); | |
4a674f34 | 838 | if (IS_ERR(msq)) { |
41a0d523 | 839 | rcu_read_unlock(); |
85398aa8 | 840 | free_copy(copy); |
023a5355 | 841 | return PTR_ERR(msq); |
4a674f34 | 842 | } |
1da177e4 LT |
843 | |
844 | for (;;) { | |
845 | struct msg_receiver msr_d; | |
1da177e4 LT |
846 | |
847 | msg = ERR_PTR(-EACCES); | |
b0e77598 | 848 | if (ipcperms(ns, &msq->q_perm, S_IRUGO)) |
41a0d523 | 849 | goto out_unlock1; |
1da177e4 | 850 | |
41a0d523 | 851 | ipc_lock_object(&msq->q_perm); |
4271b05a DB |
852 | |
853 | /* raced with RMID? */ | |
0f3d2b01 | 854 | if (!ipc_valid_object(&msq->q_perm)) { |
4271b05a DB |
855 | msg = ERR_PTR(-EIDRM); |
856 | goto out_unlock0; | |
857 | } | |
858 | ||
daaf74cf | 859 | msg = find_msg(msq, &msgtyp, mode); |
5a06a363 IM |
860 | if (!IS_ERR(msg)) { |
861 | /* | |
862 | * Found a suitable message. | |
863 | * Unlink it from the queue. | |
864 | */ | |
f9dd87f4 | 865 | if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) { |
1da177e4 | 866 | msg = ERR_PTR(-E2BIG); |
41a0d523 | 867 | goto out_unlock0; |
1da177e4 | 868 | } |
3fcfe786 SK |
869 | /* |
870 | * If we are copying, then do not unlink message and do | |
871 | * not update queue parameters. | |
872 | */ | |
852028af PH |
873 | if (msgflg & MSG_COPY) { |
874 | msg = copy_msg(msg, copy); | |
41a0d523 | 875 | goto out_unlock0; |
852028af | 876 | } |
41a0d523 | 877 | |
1da177e4 LT |
878 | list_del(&msg->m_list); |
879 | msq->q_qnum--; | |
880 | msq->q_rtime = get_seconds(); | |
b488893a | 881 | msq->q_lrpid = task_tgid_vnr(current); |
1da177e4 | 882 | msq->q_cbytes -= msg->m_ts; |
3ac88a41 KK |
883 | atomic_sub(msg->m_ts, &ns->msg_bytes); |
884 | atomic_dec(&ns->msg_hdrs); | |
e3658538 | 885 | ss_wakeup(&msq->q_senders, &wake_q, 0); |
41a0d523 DB |
886 | |
887 | goto out_unlock0; | |
1da177e4 | 888 | } |
41a0d523 | 889 | |
1da177e4 LT |
890 | /* No message waiting. Wait for a message */ |
891 | if (msgflg & IPC_NOWAIT) { | |
892 | msg = ERR_PTR(-ENOMSG); | |
41a0d523 | 893 | goto out_unlock0; |
1da177e4 | 894 | } |
41a0d523 | 895 | |
5a06a363 | 896 | list_add_tail(&msr_d.r_list, &msq->q_receivers); |
1da177e4 LT |
897 | msr_d.r_tsk = current; |
898 | msr_d.r_msgtype = msgtyp; | |
899 | msr_d.r_mode = mode; | |
5a06a363 | 900 | if (msgflg & MSG_NOERROR) |
1da177e4 | 901 | msr_d.r_maxsize = INT_MAX; |
5a06a363 | 902 | else |
f9dd87f4 | 903 | msr_d.r_maxsize = bufsz; |
1da177e4 | 904 | msr_d.r_msg = ERR_PTR(-EAGAIN); |
f75a2f35 | 905 | __set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 906 | |
41a0d523 DB |
907 | ipc_unlock_object(&msq->q_perm); |
908 | rcu_read_unlock(); | |
1da177e4 LT |
909 | schedule(); |
910 | ||
ee51636c SAS |
911 | /* |
912 | * Lockless receive, part 1: | |
913 | * We don't hold a reference to the queue and getting a | |
914 | * reference would defeat the idea of a lockless operation, | |
915 | * thus the code relies on rcu to guarantee the existence of | |
916 | * msq: | |
1da177e4 LT |
917 | * Prior to destruction, expunge_all(-EIRDM) changes r_msg. |
918 | * Thus if r_msg is -EAGAIN, then the queue not yet destroyed. | |
1da177e4 LT |
919 | */ |
920 | rcu_read_lock(); | |
921 | ||
ee51636c SAS |
922 | /* |
923 | * Lockless receive, part 2: | |
924 | * The work in pipelined_send() and expunge_all(): | |
925 | * - Set pointer to message | |
926 | * - Queue the receiver task for later wakeup | |
927 | * - Wake up the process after the lock is dropped. | |
ff35e5ef | 928 | * |
ee51636c SAS |
929 | * Should the process wake up before this wakeup (due to a |
930 | * signal) it will either see the message and continue ... | |
1da177e4 | 931 | */ |
ee51636c | 932 | msg = READ_ONCE(msr_d.r_msg); |
41a0d523 DB |
933 | if (msg != ERR_PTR(-EAGAIN)) |
934 | goto out_unlock1; | |
1da177e4 | 935 | |
ee51636c SAS |
936 | /* |
937 | * ... or see -EAGAIN, acquire the lock to check the message | |
938 | * again. | |
939 | */ | |
41a0d523 | 940 | ipc_lock_object(&msq->q_perm); |
1da177e4 | 941 | |
ee51636c | 942 | msg = msr_d.r_msg; |
5a06a363 | 943 | if (msg != ERR_PTR(-EAGAIN)) |
41a0d523 | 944 | goto out_unlock0; |
1da177e4 LT |
945 | |
946 | list_del(&msr_d.r_list); | |
947 | if (signal_pending(current)) { | |
948 | msg = ERR_PTR(-ERESTARTNOHAND); | |
41a0d523 | 949 | goto out_unlock0; |
1da177e4 | 950 | } |
41a0d523 DB |
951 | |
952 | ipc_unlock_object(&msq->q_perm); | |
1da177e4 | 953 | } |
41a0d523 DB |
954 | |
955 | out_unlock0: | |
956 | ipc_unlock_object(&msq->q_perm); | |
e3658538 | 957 | wake_up_q(&wake_q); |
41a0d523 DB |
958 | out_unlock1: |
959 | rcu_read_unlock(); | |
4a674f34 | 960 | if (IS_ERR(msg)) { |
85398aa8 | 961 | free_copy(copy); |
5a06a363 | 962 | return PTR_ERR(msg); |
4a674f34 | 963 | } |
1da177e4 | 964 | |
f9dd87f4 | 965 | bufsz = msg_handler(buf, msg, bufsz); |
1da177e4 | 966 | free_msg(msg); |
5a06a363 | 967 | |
f9dd87f4 | 968 | return bufsz; |
1da177e4 LT |
969 | } |
970 | ||
e48fbb69 HC |
971 | SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, |
972 | long, msgtyp, int, msgflg) | |
651971cb | 973 | { |
f9dd87f4 | 974 | return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill); |
651971cb | 975 | } |
976 | ||
3440a6bd DB |
977 | |
978 | void msg_init_ns(struct ipc_namespace *ns) | |
979 | { | |
980 | ns->msg_ctlmax = MSGMAX; | |
981 | ns->msg_ctlmnb = MSGMNB; | |
0050ee05 | 982 | ns->msg_ctlmni = MSGMNI; |
3440a6bd DB |
983 | |
984 | atomic_set(&ns->msg_bytes, 0); | |
985 | atomic_set(&ns->msg_hdrs, 0); | |
986 | ipc_init_ids(&ns->ids[IPC_MSG_IDS]); | |
987 | } | |
988 | ||
989 | #ifdef CONFIG_IPC_NS | |
990 | void msg_exit_ns(struct ipc_namespace *ns) | |
991 | { | |
992 | free_ipcs(ns, &msg_ids(ns), freeque); | |
993 | idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr); | |
994 | } | |
995 | #endif | |
996 | ||
1da177e4 | 997 | #ifdef CONFIG_PROC_FS |
19b4946c | 998 | static int sysvipc_msg_proc_show(struct seq_file *s, void *it) |
1da177e4 | 999 | { |
1efdb69b | 1000 | struct user_namespace *user_ns = seq_user_ns(s); |
19b4946c MW |
1001 | struct msg_queue *msq = it; |
1002 | ||
7f032d6e JP |
1003 | seq_printf(s, |
1004 | "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n", | |
1005 | msq->q_perm.key, | |
1006 | msq->q_perm.id, | |
1007 | msq->q_perm.mode, | |
1008 | msq->q_cbytes, | |
1009 | msq->q_qnum, | |
1010 | msq->q_lspid, | |
1011 | msq->q_lrpid, | |
1012 | from_kuid_munged(user_ns, msq->q_perm.uid), | |
1013 | from_kgid_munged(user_ns, msq->q_perm.gid), | |
1014 | from_kuid_munged(user_ns, msq->q_perm.cuid), | |
1015 | from_kgid_munged(user_ns, msq->q_perm.cgid), | |
1016 | msq->q_stime, | |
1017 | msq->q_rtime, | |
1018 | msq->q_ctime); | |
1019 | ||
1020 | return 0; | |
1da177e4 LT |
1021 | } |
1022 | #endif | |
3440a6bd DB |
1023 | |
1024 | void __init msg_init(void) | |
1025 | { | |
1026 | msg_init_ns(&init_ipc_ns); | |
1027 | ||
3440a6bd DB |
1028 | ipc_init_proc_interface("sysvipc/msg", |
1029 | " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n", | |
1030 | IPC_MSG_IDS, sysvipc_msg_proc_show); | |
1031 | } |