projects/linux·blob v2.6.21 · refs

678 lines · 16.9 KiB

1/*
2 * 32 bit compatibility code for System V IPC
3 *
4 * Copyright (C) 1997,1998 Jakub Jelinek ([email protected])
5 * Copyright (C) 1997 David S. Miller ([email protected])
6 * Copyright (C) 1999 Arun Sharma <[email protected]>
7 * Copyright (C) 2000 VA Linux Co
8 * Copyright (C) 2000 Don Dugger <[email protected]>
9 * Copyright (C) 2000 Hewlett-Packard Co.
10 * Copyright (C) 2000 David Mosberger-Tang <[email protected]>
11 * Copyright (C) 2000 Gerhard Tonn ([email protected])
12 * Copyright (C) 2000-2002 Andi Kleen, SuSE Labs (x86-64 port)
13 * Copyright (C) 2000 Silicon Graphics, Inc.
14 * Copyright (C) 2001 IBM
15 * Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
16 * Copyright (C) 2004 Arnd Bergmann ([email protected])
17 *
18 * This code is collected from the versions for sparc64, mips64, s390x, ia64,
19 * ppc64 and x86_64, all of which are based on the original sparc64 version
20 * by Jakub Jelinek.
21 *
22 */
23#include <linux/compat.h>
24#include <linux/errno.h>
25#include <linux/highuid.h>
26#include <linux/init.h>
27#include <linux/msg.h>
28#include <linux/shm.h>
29#include <linux/slab.h>
30#include <linux/syscalls.h>
31
32#include <linux/mutex.h>
33#include <asm/uaccess.h>
34
35#include "util.h"
36
37struct compat_msgbuf {
38 compat_long_t mtype;
39 char mtext[1];
40};
41
42struct compat_ipc_perm {
43 key_t key;
44 __compat_uid_t uid;
45 __compat_gid_t gid;
46 __compat_uid_t cuid;
47 __compat_gid_t cgid;
48 compat_mode_t mode;
49 unsigned short seq;
50};
51
52struct compat_semid_ds {
53 struct compat_ipc_perm sem_perm;
54 compat_time_t sem_otime;
55 compat_time_t sem_ctime;
56 compat_uptr_t sem_base;
57 compat_uptr_t sem_pending;
58 compat_uptr_t sem_pending_last;
59 compat_uptr_t undo;
60 unsigned short sem_nsems;
61};
62
63struct compat_msqid_ds {
64 struct compat_ipc_perm msg_perm;
65 compat_uptr_t msg_first;
66 compat_uptr_t msg_last;
67 compat_time_t msg_stime;
68 compat_time_t msg_rtime;
69 compat_time_t msg_ctime;
70 compat_ulong_t msg_lcbytes;
71 compat_ulong_t msg_lqbytes;
72 unsigned short msg_cbytes;
73 unsigned short msg_qnum;
74 unsigned short msg_qbytes;
75 compat_ipc_pid_t msg_lspid;
76 compat_ipc_pid_t msg_lrpid;
77};
78
79struct compat_shmid_ds {
80 struct compat_ipc_perm shm_perm;
81 int shm_segsz;
82 compat_time_t shm_atime;
83 compat_time_t shm_dtime;
84 compat_time_t shm_ctime;
85 compat_ipc_pid_t shm_cpid;
86 compat_ipc_pid_t shm_lpid;
87 unsigned short shm_nattch;
88 unsigned short shm_unused;
89 compat_uptr_t shm_unused2;
90 compat_uptr_t shm_unused3;
91};
92
93struct compat_ipc_kludge {
94 compat_uptr_t msgp;
95 compat_long_t msgtyp;
96};
97
98struct compat_shminfo64 {
99 compat_ulong_t shmmax;
100 compat_ulong_t shmmin;
101 compat_ulong_t shmmni;
102 compat_ulong_t shmseg;
103 compat_ulong_t shmall;
104 compat_ulong_t __unused1;
105 compat_ulong_t __unused2;
106 compat_ulong_t __unused3;
107 compat_ulong_t __unused4;
108};
109
110struct compat_shm_info {
111 compat_int_t used_ids;
112 compat_ulong_t shm_tot, shm_rss, shm_swp;
113 compat_ulong_t swap_attempts, swap_successes;
114};
115
116extern int sem_ctls[];
117#define sc_semopm (sem_ctls[2])
118
119static inline int compat_ipc_parse_version(int *cmd)
120{
121 int version = *cmd & IPC_64;
122
123 /* this is tricky: architectures that have support for the old
124 * ipc structures in 64 bit binaries need to have IPC_64 set
125 * in cmd, the others need to have it cleared */
126#ifndef ipc_parse_version
127 *cmd |= IPC_64;
128#else
129 *cmd &= ~IPC_64;
130#endif
131 return version;
132}
133
134static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
135 struct compat_ipc64_perm __user *up64)
136{
137 int err;
138
139 err = __get_user(p64->uid, &up64->uid);
140 err |= __get_user(p64->gid, &up64->gid);
141 err |= __get_user(p64->mode, &up64->mode);
142 return err;
143}
144
145static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
146 struct compat_ipc_perm __user *up)
147{
148 int err;
149
150 err = __get_user(p->uid, &up->uid);
151 err |= __get_user(p->gid, &up->gid);
152 err |= __get_user(p->mode, &up->mode);
153 return err;
154}
155
156static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
157 struct compat_ipc64_perm __user *up64)
158{
159 int err;
160
161 err = __put_user(p64->key, &up64->key);
162 err |= __put_user(p64->uid, &up64->uid);
163 err |= __put_user(p64->gid, &up64->gid);
164 err |= __put_user(p64->cuid, &up64->cuid);
165 err |= __put_user(p64->cgid, &up64->cgid);
166 err |= __put_user(p64->mode, &up64->mode);
167 err |= __put_user(p64->seq, &up64->seq);
168 return err;
169}
170
171static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
172 struct compat_ipc_perm __user *up)
173{
174 int err;
175 __compat_uid_t u;
176 __compat_gid_t g;
177
178 err = __put_user(p->key, &up->key);
179 SET_UID(u, p->uid);
180 err |= __put_user(u, &up->uid);
181 SET_GID(g, p->gid);
182 err |= __put_user(g, &up->gid);
183 SET_UID(u, p->cuid);
184 err |= __put_user(u, &up->cuid);
185 SET_GID(g, p->cgid);
186 err |= __put_user(g, &up->cgid);
187 err |= __put_user(p->mode, &up->mode);
188 err |= __put_user(p->seq, &up->seq);
189 return err;
190}
191
192static inline int get_compat_semid64_ds(struct semid64_ds *s64,
193 struct compat_semid64_ds __user *up64)
194{
195 if (!access_ok (VERIFY_READ, up64, sizeof(*up64)))
196 return -EFAULT;
197 return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
198}
199
200static inline int get_compat_semid_ds(struct semid64_ds *s,
201 struct compat_semid_ds __user *up)
202{
203 if (!access_ok (VERIFY_READ, up, sizeof(*up)))
204 return -EFAULT;
205 return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
206}
207
208static inline int put_compat_semid64_ds(struct semid64_ds *s64,
209 struct compat_semid64_ds __user *up64)
210{
211 int err;
212
213 if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64)))
214 return -EFAULT;
215 err = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
216 err |= __put_user(s64->sem_otime, &up64->sem_otime);
217 err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
218 err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
219 return err;
220}
221
222static inline int put_compat_semid_ds(struct semid64_ds *s,
223 struct compat_semid_ds __user *up)
224{
225 int err;
226
227 if (!access_ok (VERIFY_WRITE, up, sizeof(*up)))
228 err = -EFAULT;
229 err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
230 err |= __put_user(s->sem_otime, &up->sem_otime);
231 err |= __put_user(s->sem_ctime, &up->sem_ctime);
232 err |= __put_user(s->sem_nsems, &up->sem_nsems);
233 return err;
234}
235
236long compat_sys_semctl(int first, int second, int third, void __user *uptr)
237{
238 union semun fourth;
239 u32 pad;
240 int err, err2;
241 struct semid64_ds s64;
242 struct semid64_ds __user *up64;
243 int version = compat_ipc_parse_version(&third);
244
245 if (!uptr)
246 return -EINVAL;
247 if (get_user(pad, (u32 __user *) uptr))
248 return -EFAULT;
249 if ((third & (~IPC_64)) == SETVAL)
250 fourth.val = (int) pad;
251 else
252 fourth.__pad = compat_ptr(pad);
253 switch (third & (~IPC_64)) {
254 case IPC_INFO:
255 case IPC_RMID:
256 case SEM_INFO:
257 case GETVAL:
258 case GETPID:
259 case GETNCNT:
260 case GETZCNT:
261 case GETALL:
262 case SETVAL:
263 case SETALL:
264 err = sys_semctl(first, second, third, fourth);
265 break;
266
267 case IPC_STAT:
268 case SEM_STAT:
269 up64 = compat_alloc_user_space(sizeof(s64));
270 fourth.__pad = up64;
271 err = sys_semctl(first, second, third, fourth);
272 if (err < 0)
273 break;
274 if (copy_from_user(&s64, up64, sizeof(s64)))
275 err2 = -EFAULT;
276 else if (version == IPC_64)
277 err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
278 else
279 err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
280 if (err2)
281 err = -EFAULT;
282 break;
283
284 case IPC_SET:
285 if (version == IPC_64) {
286 err = get_compat_semid64_ds(&s64, compat_ptr(pad));
287 } else {
288 err = get_compat_semid_ds(&s64, compat_ptr(pad));
289 }
290 up64 = compat_alloc_user_space(sizeof(s64));
291 if (copy_to_user(up64, &s64, sizeof(s64)))
292 err = -EFAULT;
293 if (err)
294 break;
295
296 fourth.__pad = up64;
297 err = sys_semctl(first, second, third, fourth);
298 break;
299
300 default:
301 err = -EINVAL;
302 break;
303 }
304 return err;
305}
306
307long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
308{
309 struct compat_msgbuf __user *up = uptr;
310 long type;
311
312 if (first < 0)
313 return -EINVAL;
314 if (second < 0)
315 return -EINVAL;
316
317 if (get_user(type, &up->mtype))
318 return -EFAULT;
319
320 return do_msgsnd(first, type, up->mtext, second, third);
321}
322
323long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
324 int version, void __user *uptr)
325{
326 struct compat_msgbuf __user *up;
327 long type;
328 int err;
329
330 if (first < 0)
331 return -EINVAL;
332 if (second < 0)
333 return -EINVAL;
334
335 if (!version) {
336 struct compat_ipc_kludge ipck;
337 err = -EINVAL;
338 if (!uptr)
339 goto out;
340 err = -EFAULT;
341 if (copy_from_user (&ipck, uptr, sizeof(ipck)))
342 goto out;
343 uptr = compat_ptr(ipck.msgp);
344 msgtyp = ipck.msgtyp;
345 }
346 up = uptr;
347 err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
348 if (err < 0)
349 goto out;
350 if (put_user(type, &up->mtype))
351 err = -EFAULT;
352out:
353 return err;
354}
355
356static inline int get_compat_msqid64(struct msqid64_ds *m64,
357 struct compat_msqid64_ds __user *up64)
358{
359 int err;
360
361 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
362 return -EFAULT;
363 err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
364 err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
365 return err;
366}
367
368static inline int get_compat_msqid(struct msqid64_ds *m,
369 struct compat_msqid_ds __user *up)
370{
371 int err;
372
373 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
374 return -EFAULT;
375 err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
376 err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
377 return err;
378}
379
380static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
381 struct compat_msqid64_ds __user *up64)
382{
383 int err;
384
385 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
386 return -EFAULT;
387 err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
388 err |= __put_user(m64->msg_stime, &up64->msg_stime);
389 err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
390 err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
391 err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
392 err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
393 err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
394 err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
395 err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
396 return err;
397}
398
399static inline int put_compat_msqid_ds(struct msqid64_ds *m,
400 struct compat_msqid_ds __user *up)
401{
402 int err;
403
404 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
405 return -EFAULT;
406 err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
407 err |= __put_user(m->msg_stime, &up->msg_stime);
408 err |= __put_user(m->msg_rtime, &up->msg_rtime);
409 err |= __put_user(m->msg_ctime, &up->msg_ctime);
410 err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
411 err |= __put_user(m->msg_qnum, &up->msg_qnum);
412 err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
413 err |= __put_user(m->msg_lspid, &up->msg_lspid);
414 err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
415 return err;
416}
417
418long compat_sys_msgctl(int first, int second, void __user *uptr)
419{
420 int err, err2;
421 struct msqid64_ds m64;
422 int version = compat_ipc_parse_version(&second);
423 void __user *p;
424
425 switch (second & (~IPC_64)) {
426 case IPC_INFO:
427 case IPC_RMID:
428 case MSG_INFO:
429 err = sys_msgctl(first, second, uptr);
430 break;
431
432 case IPC_SET:
433 if (version == IPC_64) {
434 err = get_compat_msqid64(&m64, uptr);
435 } else {
436 err = get_compat_msqid(&m64, uptr);
437 }
438 if (err)
439 break;
440 p = compat_alloc_user_space(sizeof(m64));
441 if (copy_to_user(p, &m64, sizeof(m64)))
442 err = -EFAULT;
443 else
444 err = sys_msgctl(first, second, p);
445 break;
446
447 case IPC_STAT:
448 case MSG_STAT:
449 p = compat_alloc_user_space(sizeof(m64));
450 err = sys_msgctl(first, second, p);
451 if (err < 0)
452 break;
453 if (copy_from_user(&m64, p, sizeof(m64)))
454 err2 = -EFAULT;
455 else if (version == IPC_64)
456 err2 = put_compat_msqid64_ds(&m64, uptr);
457 else
458 err2 = put_compat_msqid_ds(&m64, uptr);
459 if (err2)
460 err = -EFAULT;
461 break;
462
463 default:
464 err = -EINVAL;
465 break;
466 }
467 return err;
468}
469
470long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
471 void __user *uptr)
472{
473 int err;
474 unsigned long raddr;
475 compat_ulong_t __user *uaddr;
476
477 if (version == 1)
478 return -EINVAL;
479 err = do_shmat(first, uptr, second, &raddr);
480 if (err < 0)
481 return err;
482 uaddr = compat_ptr(third);
483 return put_user(raddr, uaddr);
484}
485
486static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
487 struct compat_shmid64_ds __user *up64)
488{
489 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
490 return -EFAULT;
491 return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
492}
493
494static inline int get_compat_shmid_ds(struct shmid64_ds *s,
495 struct compat_shmid_ds __user *up)
496{
497 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
498 return -EFAULT;
499 return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
500}
501
502static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
503 struct compat_shmid64_ds __user *up64)
504{
505 int err;
506
507 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
508 return -EFAULT;
509 err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
510 err |= __put_user(s64->shm_atime, &up64->shm_atime);
511 err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
512 err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
513 err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
514 err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
515 err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
516 err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
517 return err;
518}
519
520static inline int put_compat_shmid_ds(struct shmid64_ds *s,
521 struct compat_shmid_ds __user *up)
522{
523 int err;
524
525 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
526 return -EFAULT;
527 err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
528 err |= __put_user(s->shm_atime, &up->shm_atime);
529 err |= __put_user(s->shm_dtime, &up->shm_dtime);
530 err |= __put_user(s->shm_ctime, &up->shm_ctime);
531 err |= __put_user(s->shm_segsz, &up->shm_segsz);
532 err |= __put_user(s->shm_nattch, &up->shm_nattch);
533 err |= __put_user(s->shm_cpid, &up->shm_cpid);
534 err |= __put_user(s->shm_lpid, &up->shm_lpid);
535 return err;
536}
537
538static inline int put_compat_shminfo64(struct shminfo64 *smi,
539 struct compat_shminfo64 __user *up64)
540{
541 int err;
542
543 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
544 return -EFAULT;
545 err = __put_user(smi->shmmax, &up64->shmmax);
546 err |= __put_user(smi->shmmin, &up64->shmmin);
547 err |= __put_user(smi->shmmni, &up64->shmmni);
548 err |= __put_user(smi->shmseg, &up64->shmseg);
549 err |= __put_user(smi->shmall, &up64->shmall);
550 return err;
551}
552
553static inline int put_compat_shminfo(struct shminfo64 *smi,
554 struct shminfo __user *up)
555{
556 int err;
557
558 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
559 return -EFAULT;
560 err = __put_user(smi->shmmax, &up->shmmax);
561 err |= __put_user(smi->shmmin, &up->shmmin);
562 err |= __put_user(smi->shmmni, &up->shmmni);
563 err |= __put_user(smi->shmseg, &up->shmseg);
564 err |= __put_user(smi->shmall, &up->shmall);
565 return err;
566}
567
568static inline int put_compat_shm_info(struct shm_info __user *ip,
569 struct compat_shm_info __user *uip)
570{
571 int err;
572 struct shm_info si;
573
574 if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
575 copy_from_user(&si, ip, sizeof(si)))
576 return -EFAULT;
577 err = __put_user(si.used_ids, &uip->used_ids);
578 err |= __put_user(si.shm_tot, &uip->shm_tot);
579 err |= __put_user(si.shm_rss, &uip->shm_rss);
580 err |= __put_user(si.shm_swp, &uip->shm_swp);
581 err |= __put_user(si.swap_attempts, &uip->swap_attempts);
582 err |= __put_user(si.swap_successes, &uip->swap_successes);
583 return err;
584}
585
586long compat_sys_shmctl(int first, int second, void __user *uptr)
587{
588 void __user *p;
589 struct shmid64_ds s64;
590 struct shminfo64 smi;
591 int err, err2;
592 int version = compat_ipc_parse_version(&second);
593
594 switch (second & (~IPC_64)) {
595 case IPC_RMID:
596 case SHM_LOCK:
597 case SHM_UNLOCK:
598 err = sys_shmctl(first, second, uptr);
599 break;
600
601 case IPC_INFO:
602 p = compat_alloc_user_space(sizeof(smi));
603 err = sys_shmctl(first, second, p);
604 if (err < 0)
605 break;
606 if (copy_from_user(&smi, p, sizeof(smi)))
607 err2 = -EFAULT;
608 else if (version == IPC_64)
609 err2 = put_compat_shminfo64(&smi, uptr);
610 else
611 err2 = put_compat_shminfo(&smi, uptr);
612 if (err2)
613 err = -EFAULT;
614 break;
615
616
617 case IPC_SET:
618 if (version == IPC_64) {
619 err = get_compat_shmid64_ds(&s64, uptr);
620 } else {
621 err = get_compat_shmid_ds(&s64, uptr);
622 }
623 if (err)
624 break;
625 p = compat_alloc_user_space(sizeof(s64));
626 if (copy_to_user(p, &s64, sizeof(s64)))
627 err = -EFAULT;
628 else
629 err = sys_shmctl(first, second, p);
630 break;
631
632 case IPC_STAT:
633 case SHM_STAT:
634 p = compat_alloc_user_space(sizeof(s64));
635 err = sys_shmctl(first, second, p);
636 if (err < 0)
637 break;
638 if (copy_from_user(&s64, p, sizeof(s64)))
639 err2 = -EFAULT;
640 else if (version == IPC_64)
641 err2 = put_compat_shmid64_ds(&s64, uptr);
642 else
643 err2 = put_compat_shmid_ds(&s64, uptr);
644 if (err2)
645 err = -EFAULT;
646 break;
647
648 case SHM_INFO:
649 p = compat_alloc_user_space(sizeof(struct shm_info));
650 err = sys_shmctl(first, second, p);
651 if (err < 0)
652 break;
653 err2 = put_compat_shm_info(p, uptr);
654 if (err2)
655 err = -EFAULT;
656 break;
657
658 default:
659 err = -EINVAL;
660 break;
661 }
662 return err;
663}
664
665long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
666 unsigned nsops, const struct compat_timespec __user *timeout)
667{
668 struct timespec __user *ts64 = NULL;
669 if (timeout) {
670 struct timespec ts;
671 ts64 = compat_alloc_user_space(sizeof(*ts64));
672 if (get_compat_timespec(&ts, timeout))
673 return -EFAULT;
674 if (copy_to_user(ts64, &ts, sizeof(ts)))
675 return -EFAULT;
676 }
677 return sys_semtimedop(semid, tsems, nsops, ts64);
678}