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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
|
/* $OpenBSD: kern_ipc_23.c,v 1.3 2002/12/17 23:11:31 millert Exp $ */
/*
* Implementation of SVID semaphores
*
* Author: Daniel Boulet
*
* This software is provided ``AS IS'' without any warranties of any kind.
*/
/*
* Implementation of SVID messages
*
* Author: Daniel Boulet
*
* Copyright 1993 Daniel Boulet and RTMX Inc.
*
* This system call was implemented by Daniel Boulet under contract from RTMX.
*
* Redistribution and use in source forms, with and without modification,
* are permitted provided that this entire comment appears intact.
*
* Redistribution in binary form may occur without any restrictions.
* Obviously, it would be nice if you gave credit where credit is due
* but requiring it would be too onerous.
*
* This software is provided ``AS IS'' without any warranties of any kind.
*/
/*
* Copyright (c) 1994 Adam Glass and Charles M. Hannum. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Adam Glass and Charles M.
* Hannum.
* 4. The names of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#ifdef SYSVMSG
void msg_freehdr(struct msg *);
int
compat_23_sys_msgctl(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct compat_23_sys_msgctl_args /* {
syscallarg(int) msqid;
syscallarg(int) cmd;
syscallarg(struct msqid_ds *) buf;
} */ *uap = v;
int msqid = SCARG(uap, msqid);
int cmd = SCARG(uap, cmd);
struct omsqid_ds *user_msqptr = SCARG(uap, buf);
struct ucred *cred = p->p_ucred;
int rval, error;
struct omsqid_ds omsqbuf;
register struct msqid_ds *msqptr;
#ifdef MSG_DEBUG_OK
printf("call to msgctl(%d, %d, %p)\n", msqid, cmd, user_msqptr);
#endif
msqid = IPCID_TO_IX(msqid);
if (msqid < 0 || msqid >= msginfo.msgmni) {
#ifdef MSG_DEBUG_OK
printf("msqid (%d) out of range (0<=msqid<%d)\n", msqid,
msginfo.msgmni);
#endif
return(EINVAL);
}
msqptr = &msqids[msqid];
if (msqptr->msg_qbytes == 0) {
#ifdef MSG_DEBUG_OK
printf("no such msqid\n");
#endif
return(EINVAL);
}
if (msqptr->msg_perm.seq != IPCID_TO_SEQ(SCARG(uap, msqid))) {
#ifdef MSG_DEBUG_OK
printf("wrong sequence number\n");
#endif
return(EINVAL);
}
error = rval = 0;
switch (cmd) {
case IPC_RMID:
{
struct msg *msghdr;
if ((error = ipcperm(cred, &msqptr->msg_perm, IPC_M)) != 0)
return(error);
/* Free the message headers */
msghdr = msqptr->msg_first;
while (msghdr != NULL) {
struct msg *msghdr_tmp;
/* Free the segments of each message */
msqptr->msg_cbytes -= msghdr->msg_ts;
msqptr->msg_qnum--;
msghdr_tmp = msghdr;
msghdr = msghdr->msg_next;
msg_freehdr(msghdr_tmp);
}
#ifdef DIAGNOSTIC
if (msqptr->msg_cbytes != 0)
panic("sys_omsgctl: msg_cbytes is screwed up");
if (msqptr->msg_qnum != 0)
panic("sys_omsgctl: msg_qnum is screwed up");
#endif
msqptr->msg_qbytes = 0; /* Mark it as free */
wakeup((caddr_t)msqptr);
}
break;
case IPC_SET:
if ((error = ipcperm(cred, &msqptr->msg_perm, IPC_M)))
return(error);
if ((error = copyin(user_msqptr, &omsqbuf, sizeof(omsqbuf))) != 0)
return(error);
if (omsqbuf.msg_qbytes > msqptr->msg_qbytes && cred->cr_uid != 0)
return(EPERM);
if (omsqbuf.msg_qbytes > msginfo.msgmnb) {
#ifdef MSG_DEBUG_OK
printf("can't increase msg_qbytes beyond %d (truncating)\n",
msginfo.msgmnb);
#endif
omsqbuf.msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */
}
if (omsqbuf.msg_qbytes == 0) {
#ifdef MSG_DEBUG_OK
printf("can't reduce msg_qbytes to 0\n");
#endif
return(EINVAL); /* non-standard errno! */
}
msqptr->msg_perm.uid = omsqbuf.msg_perm.uid; /* change the owner */
msqptr->msg_perm.gid = omsqbuf.msg_perm.gid; /* change the owner */
msqptr->msg_perm.mode = (msqptr->msg_perm.mode & ~0777) |
(omsqbuf.msg_perm.mode & 0777);
msqptr->msg_qbytes = omsqbuf.msg_qbytes;
msqptr->msg_ctime = time.tv_sec;
break;
case IPC_STAT:
if ((error = ipcperm(cred, &msqptr->msg_perm, IPC_R))) {
#ifdef MSG_DEBUG_OK
printf("requester doesn't have read access\n");
#endif
return(error);
}
msqid_n2o(msqptr, &omsqbuf);
error = copyout((caddr_t)&omsqbuf, user_msqptr, sizeof omsqbuf);
break;
default:
#ifdef MSG_DEBUG_OK
printf("invalid command %d\n", cmd);
#endif
return(EINVAL);
}
if (error == 0)
*retval = rval;
return(error);
}
#endif /* SYSVMSG */
#ifdef SYSVSHM
struct shmid_ds *shm_find_segment_by_shmid(int);
void shm_deallocate_segment(struct shmid_ds *);
#define SHMSEG_REMOVED 0x0400 /* XXX */
int
compat_23_sys_shmctl(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct compat_23_sys_shmctl_args /* {
syscallarg(int) shmid;
syscallarg(int) cmd;
syscallarg(struct shmid_ds *) buf;
} */ *uap = v;
int error;
struct ucred *cred = p->p_ucred;
struct oshmid_ds oinbuf;
struct shmid_ds *shmseg;
extern int shm_last_free;
shmseg = shm_find_segment_by_shmid(SCARG(uap, shmid));
if (shmseg == NULL)
return EINVAL;
switch (SCARG(uap, cmd)) {
case IPC_STAT:
if ((error = ipcperm(cred, &shmseg->shm_perm, IPC_R)) != 0)
return error;
shmid_n2o(shmseg, &oinbuf);
error = copyout((caddr_t)&oinbuf, SCARG(uap, buf),
sizeof(oinbuf));
if (error)
return error;
break;
case IPC_SET:
if ((error = ipcperm(cred, &shmseg->shm_perm, IPC_M)) != 0)
return error;
error = copyin(SCARG(uap, buf), (caddr_t)&oinbuf,
sizeof(oinbuf));
if (error)
return error;
shmseg->shm_perm.uid = oinbuf.shm_perm.uid;
shmseg->shm_perm.gid = oinbuf.shm_perm.gid;
shmseg->shm_perm.mode =
(shmseg->shm_perm.mode & ~ACCESSPERMS) |
(oinbuf.shm_perm.mode & ACCESSPERMS);
shmseg->shm_ctime = time.tv_sec;
break;
case IPC_RMID:
if ((error = ipcperm(cred, &shmseg->shm_perm, IPC_M)) != 0)
return error;
shmseg->shm_perm.key = IPC_PRIVATE;
shmseg->shm_perm.mode |= SHMSEG_REMOVED;
if (shmseg->shm_nattch <= 0) {
shm_deallocate_segment(shmseg);
shm_last_free = IPCID_TO_IX(SCARG(uap, shmid));
}
break;
case SHM_LOCK:
case SHM_UNLOCK:
default:
return EINVAL;
}
return 0;
}
#endif /* SYSVSHM */
#ifdef SYSVSEM
extern struct pool sema_pool;
void semundo_clear(int, int);
int
compat_23_sys___semctl(p, v, retval)
struct proc *p;
register void *v;
register_t *retval;
{
register struct compat_23_sys___semctl_args /* {
syscallarg(int) semid;
syscallarg(int) semnum;
syscallarg(int) cmd;
syscallarg(union semun *) arg;
} */ *uap = v;
int semid = SCARG(uap, semid);
int semnum = SCARG(uap, semnum);
int cmd = SCARG(uap, cmd);
union semun *arg = SCARG(uap, arg);
union semun real_arg;
struct ucred *cred = p->p_ucred;
int i, rval, error;
struct semid_ds *semaptr;
struct osemid_ds osbuf;
extern int semtot;
#ifdef SEM_DEBUG
printf("call to semctl(%d, %d, %d, %p)\n", semid, semnum, cmd, arg);
#endif
semid = IPCID_TO_IX(semid);
if (semid < 0 || semid >= seminfo.semmsl)
return(EINVAL);
if ((semaptr = sema[semid]) == NULL ||
semaptr->sem_perm.seq != IPCID_TO_SEQ(SCARG(uap, semid)))
return(EINVAL);
error = rval = 0;
switch (cmd) {
case IPC_RMID:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_M)) != 0)
return(error);
semaptr->sem_perm.cuid = cred->cr_uid;
semaptr->sem_perm.uid = cred->cr_uid;
semtot -= semaptr->sem_nsems;
free(semaptr->sem_base, M_SHM);
pool_put(&sema_pool, semaptr);
sema[semid] = NULL;
semundo_clear(semid, -1);
wakeup((caddr_t)&sema[semid]);
break;
case IPC_SET:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_M)))
return(error);
if ((error = copyin(arg, &real_arg, sizeof(real_arg))) != 0)
return(error);
if ((error = copyin(real_arg.buf, (caddr_t)&osbuf,
sizeof(osbuf))) != 0)
return(error);
semaptr->sem_perm.uid = osbuf.sem_perm.uid;
semaptr->sem_perm.gid = osbuf.sem_perm.gid;
semaptr->sem_perm.mode = (semaptr->sem_perm.mode & ~0777) |
(osbuf.sem_perm.mode & 0777);
semaptr->sem_ctime = time.tv_sec;
break;
case IPC_STAT:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_R)))
return(error);
if ((error = copyin(arg, &real_arg, sizeof(real_arg))) != 0)
return(error);
semid_n2o(semaptr, &osbuf);
error = copyout((caddr_t)&osbuf, real_arg.buf, sizeof(osbuf));
break;
case GETNCNT:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_R)))
return(error);
if (semnum < 0 || semnum >= semaptr->sem_nsems)
return(EINVAL);
rval = semaptr->sem_base[semnum].semncnt;
break;
case GETPID:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_R)))
return(error);
if (semnum < 0 || semnum >= semaptr->sem_nsems)
return(EINVAL);
rval = semaptr->sem_base[semnum].sempid;
break;
case GETVAL:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_R)))
return(error);
if (semnum < 0 || semnum >= semaptr->sem_nsems)
return(EINVAL);
rval = semaptr->sem_base[semnum].semval;
break;
case GETALL:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_R)))
return(error);
if ((error = copyin(arg, &real_arg, sizeof(real_arg))) != 0)
return(error);
for (i = 0; i < semaptr->sem_nsems; i++) {
error = copyout((caddr_t)&semaptr->sem_base[i].semval,
&real_arg.array[i], sizeof(real_arg.array[0]));
if (error != 0)
break;
}
break;
case GETZCNT:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_R)))
return(error);
if (semnum < 0 || semnum >= semaptr->sem_nsems)
return(EINVAL);
rval = semaptr->sem_base[semnum].semzcnt;
break;
case SETVAL:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_W)))
return(error);
if (semnum < 0 || semnum >= semaptr->sem_nsems)
return(EINVAL);
if ((error = copyin(arg, &real_arg, sizeof(real_arg))) != 0)
return(error);
semaptr->sem_base[semnum].semval = real_arg.val;
semundo_clear(semid, semnum);
wakeup((caddr_t)&sema[semid]);
break;
case SETALL:
if ((error = ipcperm(cred, &semaptr->sem_perm, IPC_W)))
return(error);
if ((error = copyin(arg, &real_arg, sizeof(real_arg))) != 0)
return(error);
for (i = 0; i < semaptr->sem_nsems; i++) {
error = copyin(&real_arg.array[i],
(caddr_t)&semaptr->sem_base[i].semval,
sizeof(real_arg.array[0]));
if (error != 0)
break;
}
semundo_clear(semid, -1);
wakeup((caddr_t)&sema[semid]);
break;
default:
return(EINVAL);
}
if (error == 0)
*retval = rval;
return(error);
}
#endif /* SYSVSEM */
|