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UBUNTU: Ubuntu-4.10.0-37.41
[mirror_ubuntu-zesty-kernel.git] / ipc / compat.c
CommitLineData
1da177e4
LT		 1/*
2 * 32 bit compatibility code for System V IPC
3 *
4 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
7 * Copyright (C) 2000 VA Linux Co
8 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
9 * Copyright (C) 2000 Hewlett-Packard Co.
10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
11 * Copyright (C) 2000 Gerhard Tonn (ton@de.ibm.com)
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 (arnd@arndb.de)
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>
1da177e4
LT		 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>
1da177e4 29#include <linux/syscalls.h>
48b25c43 30#include <linux/ptrace.h>
1da177e4 31
5f921ae9 32#include <linux/mutex.h>
7153e402 33#include <linux/uaccess.h>
1da177e4
LT		 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;
202e5979
SR		 44 __compat_uid_t uid;
45 __compat_gid_t gid;
46 __compat_uid_t cuid;
47 __compat_gid_t cgid;
1da177e4
LT		 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
1da177e4
LT		 116static inline int compat_ipc_parse_version(int *cmd)
117{
c1d7e01d 118#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
1da177e4
LT		 119 int version = *cmd & IPC_64;
120
121 /* this is tricky: architectures that have support for the old
122 * ipc structures in 64 bit binaries need to have IPC_64 set
123 * in cmd, the others need to have it cleared */
124#ifndef ipc_parse_version
125 *cmd |= IPC_64;
126#else
127 *cmd &= ~IPC_64;
128#endif
129 return version;
48b25c43
CM		 130#else
131 /* With the asm-generic APIs, we always use the 64-bit versions. */
132 return IPC_64;
133#endif
1da177e4
LT		 134}
135
136static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
137 struct compat_ipc64_perm __user *up64)
138{
139 int err;
140
141 err = __get_user(p64->uid, &up64->uid);
142 err |= __get_user(p64->gid, &up64->gid);
143 err |= __get_user(p64->mode, &up64->mode);
144 return err;
145}
146
147static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
148 struct compat_ipc_perm __user *up)
149{
150 int err;
151
152 err = __get_user(p->uid, &up->uid);
153 err |= __get_user(p->gid, &up->gid);
154 err |= __get_user(p->mode, &up->mode);
155 return err;
156}
157
158static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
159 struct compat_ipc64_perm __user *up64)
160{
161 int err;
162
163 err = __put_user(p64->key, &up64->key);
164 err |= __put_user(p64->uid, &up64->uid);
165 err |= __put_user(p64->gid, &up64->gid);
166 err |= __put_user(p64->cuid, &up64->cuid);
167 err |= __put_user(p64->cgid, &up64->cgid);
168 err |= __put_user(p64->mode, &up64->mode);
169 err |= __put_user(p64->seq, &up64->seq);
170 return err;
171}
172
173static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
0d5e7580 174 struct compat_ipc_perm __user *uip)
1da177e4
LT		 175{
176 int err;
202e5979
SR		 177 __compat_uid_t u;
178 __compat_gid_t g;
1da177e4 179
0d5e7580 180 err = __put_user(p->key, &uip->key);
1da177e4 181 SET_UID(u, p->uid);
0d5e7580 182 err |= __put_user(u, &uip->uid);
1da177e4 183 SET_GID(g, p->gid);
0d5e7580 184 err |= __put_user(g, &uip->gid);
1da177e4 185 SET_UID(u, p->cuid);
0d5e7580 186 err |= __put_user(u, &uip->cuid);
1da177e4 187 SET_GID(g, p->cgid);
0d5e7580
MR		 188 err |= __put_user(g, &uip->cgid);
189 err |= __put_user(p->mode, &uip->mode);
190 err |= __put_user(p->seq, &uip->seq);
1da177e4
LT		 191 return err;
192}
193
0d5e7580 194static inline int get_compat_semid64_ds(struct semid64_ds *sem64,
1da177e4
LT		 195 struct compat_semid64_ds __user *up64)
196{
239521f3 197 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
1da177e4 198 return -EFAULT;
0d5e7580 199 return __get_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm);
1da177e4
LT		 200}
201
202static inline int get_compat_semid_ds(struct semid64_ds *s,
203 struct compat_semid_ds __user *up)
204{
239521f3 205 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
1da177e4
LT		 206 return -EFAULT;
207 return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
208}
209
0d5e7580 210static inline int put_compat_semid64_ds(struct semid64_ds *sem64,
1da177e4
LT		 211 struct compat_semid64_ds __user *up64)
212{
213 int err;
214
239521f3 215 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
1da177e4 216 return -EFAULT;
0d5e7580
MR		 217 err = __put_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm);
218 err |= __put_user(sem64->sem_otime, &up64->sem_otime);
219 err |= __put_user(sem64->sem_ctime, &up64->sem_ctime);
220 err |= __put_user(sem64->sem_nsems, &up64->sem_nsems);
1da177e4
LT		 221 return err;
222}
223
224static inline int put_compat_semid_ds(struct semid64_ds *s,
225 struct compat_semid_ds __user *up)
226{
227 int err;
228
239521f3 229 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
d57d9731 230 return -EFAULT;
1da177e4
LT		 231 err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
232 err |= __put_user(s->sem_otime, &up->sem_otime);
233 err |= __put_user(s->sem_ctime, &up->sem_ctime);
234 err |= __put_user(s->sem_nsems, &up->sem_nsems);
235 return err;
236}
237
48b25c43 238static long do_compat_semctl(int first, int second, int third, u32 pad)
1da177e4 239{
e1fd1f49 240 unsigned long fourth;
1da177e4 241 int err, err2;
0d5e7580 242 struct semid64_ds sem64;
1da177e4
LT		 243 struct semid64_ds __user *up64;
244 int version = compat_ipc_parse_version(&third);
245
0d5e7580 246 memset(&sem64, 0, sizeof(sem64));
03145beb 247
1da177e4 248 if ((third & (~IPC_64)) == SETVAL)
e1fd1f49
AV		 249#ifdef __BIG_ENDIAN
250 fourth = (unsigned long)pad << 32;
251#else
252 fourth = pad;
253#endif
1da177e4 254 else
e1fd1f49 255 fourth = (unsigned long)compat_ptr(pad);
1da177e4
LT		 256 switch (third & (~IPC_64)) {
257 case IPC_INFO:
258 case IPC_RMID:
259 case SEM_INFO:
260 case GETVAL:
261 case GETPID:
262 case GETNCNT:
263 case GETZCNT:
264 case GETALL:
265 case SETVAL:
266 case SETALL:
267 err = sys_semctl(first, second, third, fourth);
268 break;
269
270 case IPC_STAT:
271 case SEM_STAT:
0d5e7580 272 up64 = compat_alloc_user_space(sizeof(sem64));
e1fd1f49 273 fourth = (unsigned long)up64;
1da177e4
LT		 274 err = sys_semctl(first, second, third, fourth);
275 if (err < 0)
276 break;
0d5e7580 277 if (copy_from_user(&sem64, up64, sizeof(sem64)))
1da177e4
LT		 278 err2 = -EFAULT;
279 else if (version == IPC_64)
0d5e7580 280 err2 = put_compat_semid64_ds(&sem64, compat_ptr(pad));
1da177e4 281 else
0d5e7580 282 err2 = put_compat_semid_ds(&sem64, compat_ptr(pad));
1da177e4
LT		 283 if (err2)
284 err = -EFAULT;
285 break;
286
287 case IPC_SET:
3ab08fe2 288 if (version == IPC_64)
0d5e7580 289 err = get_compat_semid64_ds(&sem64, compat_ptr(pad));
3ab08fe2 290 else
0d5e7580 291 err = get_compat_semid_ds(&sem64, compat_ptr(pad));
3ab08fe2 292
0d5e7580
MR		 293 up64 = compat_alloc_user_space(sizeof(sem64));
294 if (copy_to_user(up64, &sem64, sizeof(sem64)))
1da177e4
LT		 295 err = -EFAULT;
296 if (err)
297 break;
298
e1fd1f49 299 fourth = (unsigned long)up64;
1da177e4
LT		 300 err = sys_semctl(first, second, third, fourth);
301 break;
302
303 default:
304 err = -EINVAL;
305 break;
306 }
307 return err;
308}
309
0e65a81b 310static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
f9dd87f4
SK		 311{
312 struct compat_msgbuf __user *msgp = dest;
313 size_t msgsz;
314
315 if (put_user(msg->m_type, &msgp->mtype))
316 return -EFAULT;
317
318 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
319 if (store_msg(msgp->mtext, msg, msgsz))
320 return -EFAULT;
321 return msgsz;
322}
323
0e65a81b
AV		 324#ifndef COMPAT_SHMLBA
325#define COMPAT_SHMLBA SHMLBA
326#endif
56e41d3c 327
0e65a81b 328#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
56e41d3c
AV		 329COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
330 u32, third, compat_uptr_t, ptr, u32, fifth)
331{
332 int version;
0e65a81b 333 u32 pad;
56e41d3c
AV		 334
335 version = call >> 16; /* hack for backward compatibility */
336 call &= 0xffff;
337
338 switch (call) {
339 case SEMOP:
340 /* struct sembuf is the same on 32 and 64bit :)) */
341 return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
342 case SEMTIMEDOP:
343 return compat_sys_semtimedop(first, compat_ptr(ptr), second,
344 compat_ptr(fifth));
345 case SEMGET:
346 return sys_semget(first, second, third);
347 case SEMCTL:
0e65a81b
AV		 348 if (!ptr)
349 return -EINVAL;
350 if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
351 return -EFAULT;
352 return do_compat_semctl(first, second, third, pad);
353
354 case MSGSND: {
355 struct compat_msgbuf __user *up = compat_ptr(ptr);
356 compat_long_t type;
357
358 if (first < 0 || second < 0)
359 return -EINVAL;
56e41d3c 360
0e65a81b
AV		 361 if (get_user(type, &up->mtype))
362 return -EFAULT;
363
364 return do_msgsnd(first, type, up->mtext, second, third);
365 }
366 case MSGRCV: {
367 void __user *uptr = compat_ptr(ptr);
368
369 if (first < 0 || second < 0)
370 return -EINVAL;
371
372 if (!version) {
373 struct compat_ipc_kludge ipck;
374 if (!uptr)
375 return -EINVAL;
239521f3 376 if (copy_from_user(&ipck, uptr, sizeof(ipck)))
0e65a81b
AV		 377 return -EFAULT;
378 uptr = compat_ptr(ipck.msgp);
379 fifth = ipck.msgtyp;
380 }
e7ca2552 381 return do_msgrcv(first, uptr, second, (s32)fifth, third,
0e65a81b
AV		 382 compat_do_msg_fill);
383 }
56e41d3c
AV		 384 case MSGGET:
385 return sys_msgget(first, second);
386 case MSGCTL:
387 return compat_sys_msgctl(first, second, compat_ptr(ptr));
388
0e65a81b
AV		 389 case SHMAT: {
390 int err;
391 unsigned long raddr;
392
393 if (version == 1)
394 return -EINVAL;
395 err = do_shmat(first, compat_ptr(ptr), second, &raddr,
396 COMPAT_SHMLBA);
397 if (err < 0)
398 return err;
399 return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
400 }
56e41d3c
AV		 401 case SHMDT:
402 return sys_shmdt(compat_ptr(ptr));
403 case SHMGET:
404 return sys_shmget(first, (unsigned)second, third);
405 case SHMCTL:
406 return compat_sys_shmctl(first, second, compat_ptr(ptr));
407 }
408
409 return -ENOSYS;
410}
0e65a81b
AV		 411#endif
412
413COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
48b25c43
CM		 414{
415 return do_compat_semctl(semid, semnum, cmd, arg);
416}
417
0e65a81b
AV		 418COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
419 compat_ssize_t, msgsz, int, msgflg)
48b25c43 420{
0e65a81b 421 struct compat_msgbuf __user *up = compat_ptr(msgp);
48b25c43
CM		 422 compat_long_t mtype;
423
0e65a81b 424 if (get_user(mtype, &up->mtype))
48b25c43 425 return -EFAULT;
0e65a81b 426 return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
48b25c43
CM		 427}
428
0e65a81b 429COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
291fdb0b 430 compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg)
48b25c43 431{
291fdb0b 432 return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
0e65a81b 433 msgflg, compat_do_msg_fill);
48b25c43 434}
1da177e4
LT		 435
436static inline int get_compat_msqid64(struct msqid64_ds *m64,
437 struct compat_msqid64_ds __user *up64)
438{
439 int err;
440
441 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
442 return -EFAULT;
443 err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
444 err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
445 return err;
446}
447
448static inline int get_compat_msqid(struct msqid64_ds *m,
449 struct compat_msqid_ds __user *up)
450{
451 int err;
452
453 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
454 return -EFAULT;
455 err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
456 err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
457 return err;
458}
459
460static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
461 struct compat_msqid64_ds __user *up64)
462{
463 int err;
464
465 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
466 return -EFAULT;
467 err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
468 err |= __put_user(m64->msg_stime, &up64->msg_stime);
469 err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
470 err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
471 err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
472 err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
473 err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
474 err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
475 err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
476 return err;
477}
478
479static inline int put_compat_msqid_ds(struct msqid64_ds *m,
480 struct compat_msqid_ds __user *up)
481{
482 int err;
483
484 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
485 return -EFAULT;
486 err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
487 err |= __put_user(m->msg_stime, &up->msg_stime);
488 err |= __put_user(m->msg_rtime, &up->msg_rtime);
489 err |= __put_user(m->msg_ctime, &up->msg_ctime);
490 err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
491 err |= __put_user(m->msg_qnum, &up->msg_qnum);
492 err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
493 err |= __put_user(m->msg_lspid, &up->msg_lspid);
494 err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
495 return err;
496}
497
5d70a596 498COMPAT_SYSCALL_DEFINE3(msgctl, int, first, int, second, void __user *, uptr)
1da177e4
LT		 499{
500 int err, err2;
501 struct msqid64_ds m64;
502 int version = compat_ipc_parse_version(&second);
503 void __user *p;
504
03145beb
DR		 505 memset(&m64, 0, sizeof(m64));
506
1da177e4
LT		 507 switch (second & (~IPC_64)) {
508 case IPC_INFO:
509 case IPC_RMID:
510 case MSG_INFO:
511 err = sys_msgctl(first, second, uptr);
512 break;
513
514 case IPC_SET:
3ab08fe2 515 if (version == IPC_64)
1da177e4 516 err = get_compat_msqid64(&m64, uptr);
3ab08fe2 517 else
1da177e4 518 err = get_compat_msqid(&m64, uptr);
3ab08fe2 519
1da177e4
LT		 520 if (err)
521 break;
522 p = compat_alloc_user_space(sizeof(m64));
523 if (copy_to_user(p, &m64, sizeof(m64)))
524 err = -EFAULT;
525 else
526 err = sys_msgctl(first, second, p);
527 break;
528
529 case IPC_STAT:
530 case MSG_STAT:
531 p = compat_alloc_user_space(sizeof(m64));
532 err = sys_msgctl(first, second, p);
533 if (err < 0)
534 break;
535 if (copy_from_user(&m64, p, sizeof(m64)))
536 err2 = -EFAULT;
537 else if (version == IPC_64)
538 err2 = put_compat_msqid64_ds(&m64, uptr);
539 else
540 err2 = put_compat_msqid_ds(&m64, uptr);
541 if (err2)
542 err = -EFAULT;
543 break;
544
545 default:
546 err = -EINVAL;
547 break;
548 }
549 return err;
550}
551
0e65a81b 552COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
48b25c43
CM		 553{
554 unsigned long ret;
555 long err;
556
079a96ae 557 err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
48b25c43
CM		 558 if (err)
559 return err;
560 force_successful_syscall_return();
561 return (long)ret;
562}
1da177e4 563
0d5e7580 564static inline int get_compat_shmid64_ds(struct shmid64_ds *sem64,
1da177e4
LT		 565 struct compat_shmid64_ds __user *up64)
566{
567 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
568 return -EFAULT;
0d5e7580 569 return __get_compat_ipc64_perm(&sem64->shm_perm, &up64->shm_perm);
1da177e4
LT		 570}
571
572static inline int get_compat_shmid_ds(struct shmid64_ds *s,
573 struct compat_shmid_ds __user *up)
574{
575 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
576 return -EFAULT;
577 return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
578}
579
0d5e7580 580static inline int put_compat_shmid64_ds(struct shmid64_ds *sem64,
1da177e4
LT		 581 struct compat_shmid64_ds __user *up64)
582{
583 int err;
584
585 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
586 return -EFAULT;
0d5e7580
MR		 587 err = __put_compat_ipc64_perm(&sem64->shm_perm, &up64->shm_perm);
588 err |= __put_user(sem64->shm_atime, &up64->shm_atime);
589 err |= __put_user(sem64->shm_dtime, &up64->shm_dtime);
590 err |= __put_user(sem64->shm_ctime, &up64->shm_ctime);
591 err |= __put_user(sem64->shm_segsz, &up64->shm_segsz);
592 err |= __put_user(sem64->shm_nattch, &up64->shm_nattch);
593 err |= __put_user(sem64->shm_cpid, &up64->shm_cpid);
594 err |= __put_user(sem64->shm_lpid, &up64->shm_lpid);
1da177e4
LT		 595 return err;
596}
597
598static inline int put_compat_shmid_ds(struct shmid64_ds *s,
599 struct compat_shmid_ds __user *up)
600{
601 int err;
602
603 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
604 return -EFAULT;
605 err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
606 err |= __put_user(s->shm_atime, &up->shm_atime);
607 err |= __put_user(s->shm_dtime, &up->shm_dtime);
608 err |= __put_user(s->shm_ctime, &up->shm_ctime);
609 err |= __put_user(s->shm_segsz, &up->shm_segsz);
610 err |= __put_user(s->shm_nattch, &up->shm_nattch);
611 err |= __put_user(s->shm_cpid, &up->shm_cpid);
612 err |= __put_user(s->shm_lpid, &up->shm_lpid);
613 return err;
614}
615
616static inline int put_compat_shminfo64(struct shminfo64 *smi,
617 struct compat_shminfo64 __user *up64)
618{
619 int err;
620
621 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
622 return -EFAULT;
af7c693f
GS		 623 if (smi->shmmax > INT_MAX)
624 smi->shmmax = INT_MAX;
1da177e4
LT		 625 err = __put_user(smi->shmmax, &up64->shmmax);
626 err |= __put_user(smi->shmmin, &up64->shmmin);
627 err |= __put_user(smi->shmmni, &up64->shmmni);
628 err |= __put_user(smi->shmseg, &up64->shmseg);
629 err |= __put_user(smi->shmall, &up64->shmall);
630 return err;
631}
632
633static inline int put_compat_shminfo(struct shminfo64 *smi,
634 struct shminfo __user *up)
635{
636 int err;
637
638 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
639 return -EFAULT;
af7c693f
GS		 640 if (smi->shmmax > INT_MAX)
641 smi->shmmax = INT_MAX;
1da177e4
LT		 642 err = __put_user(smi->shmmax, &up->shmmax);
643 err |= __put_user(smi->shmmin, &up->shmmin);
644 err |= __put_user(smi->shmmni, &up->shmmni);
645 err |= __put_user(smi->shmseg, &up->shmseg);
646 err |= __put_user(smi->shmall, &up->shmall);
214a627c 647 return err;
1da177e4
LT		 648}
649
650static inline int put_compat_shm_info(struct shm_info __user *ip,
651 struct compat_shm_info __user *uip)
652{
653 int err;
654 struct shm_info si;
655
656 if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
657 copy_from_user(&si, ip, sizeof(si)))
658 return -EFAULT;
659 err = __put_user(si.used_ids, &uip->used_ids);
660 err |= __put_user(si.shm_tot, &uip->shm_tot);
661 err |= __put_user(si.shm_rss, &uip->shm_rss);
662 err |= __put_user(si.shm_swp, &uip->shm_swp);
663 err |= __put_user(si.swap_attempts, &uip->swap_attempts);
664 err |= __put_user(si.swap_successes, &uip->swap_successes);
665 return err;
666}
667
5d70a596 668COMPAT_SYSCALL_DEFINE3(shmctl, int, first, int, second, void __user *, uptr)
1da177e4
LT		 669{
670 void __user *p;
0d5e7580 671 struct shmid64_ds sem64;
1da177e4
LT		 672 struct shminfo64 smi;
673 int err, err2;
674 int version = compat_ipc_parse_version(&second);
675
0d5e7580 676 memset(&sem64, 0, sizeof(sem64));
03145beb 677
1da177e4
LT		 678 switch (second & (~IPC_64)) {
679 case IPC_RMID:
680 case SHM_LOCK:
681 case SHM_UNLOCK:
682 err = sys_shmctl(first, second, uptr);
683 break;
684
685 case IPC_INFO:
686 p = compat_alloc_user_space(sizeof(smi));
687 err = sys_shmctl(first, second, p);
688 if (err < 0)
689 break;
690 if (copy_from_user(&smi, p, sizeof(smi)))
691 err2 = -EFAULT;
692 else if (version == IPC_64)
693 err2 = put_compat_shminfo64(&smi, uptr);
694 else
695 err2 = put_compat_shminfo(&smi, uptr);
696 if (err2)
697 err = -EFAULT;
698 break;
699
700
701 case IPC_SET:
3ab08fe2 702 if (version == IPC_64)
0d5e7580 703 err = get_compat_shmid64_ds(&sem64, uptr);
3ab08fe2 704 else
0d5e7580 705 err = get_compat_shmid_ds(&sem64, uptr);
3ab08fe2 706
1da177e4
LT		 707 if (err)
708 break;
0d5e7580
MR		 709 p = compat_alloc_user_space(sizeof(sem64));
710 if (copy_to_user(p, &sem64, sizeof(sem64)))
1da177e4
LT		 711 err = -EFAULT;
712 else
713 err = sys_shmctl(first, second, p);
714 break;
715
716 case IPC_STAT:
717 case SHM_STAT:
0d5e7580 718 p = compat_alloc_user_space(sizeof(sem64));
1da177e4
LT		 719 err = sys_shmctl(first, second, p);
720 if (err < 0)
721 break;
0d5e7580 722 if (copy_from_user(&sem64, p, sizeof(sem64)))
1da177e4
LT		 723 err2 = -EFAULT;
724 else if (version == IPC_64)
0d5e7580 725 err2 = put_compat_shmid64_ds(&sem64, uptr);
1da177e4 726 else
0d5e7580 727 err2 = put_compat_shmid_ds(&sem64, uptr);
1da177e4
LT		 728 if (err2)
729 err = -EFAULT;
730 break;
731
732 case SHM_INFO:
733 p = compat_alloc_user_space(sizeof(struct shm_info));
734 err = sys_shmctl(first, second, p);
735 if (err < 0)
736 break;
737 err2 = put_compat_shm_info(p, uptr);
738 if (err2)
739 err = -EFAULT;
740 break;
741
742 default:
743 err = -EINVAL;
744 break;
745 }
746 return err;
747}
748
5d70a596
HC		 749COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
750 unsigned, nsops,
751 const struct compat_timespec __user *, timeout)
1da177e4 752{
81993e81
PA		 753 struct timespec __user *ts64;
754 if (compat_convert_timespec(&ts64, timeout))
755 return -EFAULT;
1da177e4
LT		 756 return sys_semtimedop(semid, tsems, nsops, ts64);
757}
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