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merge compat sys_ipc instances
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
1da177e4
LT		 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;
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
116extern int sem_ctls[];
117#define sc_semopm (sem_ctls[2])
1da177e4
LT		 118
119static inline int compat_ipc_parse_version(int *cmd)
120{
c1d7e01d 121#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
1da177e4
LT		 122 int version = *cmd & IPC_64;
123
124 /* this is tricky: architectures that have support for the old
125 * ipc structures in 64 bit binaries need to have IPC_64 set
126 * in cmd, the others need to have it cleared */
127#ifndef ipc_parse_version
128 *cmd |= IPC_64;
129#else
130 *cmd &= ~IPC_64;
131#endif
132 return version;
48b25c43
CM		 133#else
134 /* With the asm-generic APIs, we always use the 64-bit versions. */
135 return IPC_64;
136#endif
1da177e4
LT		 137}
138
139static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
140 struct compat_ipc64_perm __user *up64)
141{
142 int err;
143
144 err = __get_user(p64->uid, &up64->uid);
145 err |= __get_user(p64->gid, &up64->gid);
146 err |= __get_user(p64->mode, &up64->mode);
147 return err;
148}
149
150static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
151 struct compat_ipc_perm __user *up)
152{
153 int err;
154
155 err = __get_user(p->uid, &up->uid);
156 err |= __get_user(p->gid, &up->gid);
157 err |= __get_user(p->mode, &up->mode);
158 return err;
159}
160
161static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
162 struct compat_ipc64_perm __user *up64)
163{
164 int err;
165
166 err = __put_user(p64->key, &up64->key);
167 err |= __put_user(p64->uid, &up64->uid);
168 err |= __put_user(p64->gid, &up64->gid);
169 err |= __put_user(p64->cuid, &up64->cuid);
170 err |= __put_user(p64->cgid, &up64->cgid);
171 err |= __put_user(p64->mode, &up64->mode);
172 err |= __put_user(p64->seq, &up64->seq);
173 return err;
174}
175
176static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
177 struct compat_ipc_perm __user *up)
178{
179 int err;
202e5979
SR		 180 __compat_uid_t u;
181 __compat_gid_t g;
1da177e4
LT		 182
183 err = __put_user(p->key, &up->key);
184 SET_UID(u, p->uid);
185 err |= __put_user(u, &up->uid);
186 SET_GID(g, p->gid);
187 err |= __put_user(g, &up->gid);
188 SET_UID(u, p->cuid);
189 err |= __put_user(u, &up->cuid);
190 SET_GID(g, p->cgid);
191 err |= __put_user(g, &up->cgid);
192 err |= __put_user(p->mode, &up->mode);
193 err |= __put_user(p->seq, &up->seq);
194 return err;
195}
196
197static inline int get_compat_semid64_ds(struct semid64_ds *s64,
198 struct compat_semid64_ds __user *up64)
199{
200 if (!access_ok (VERIFY_READ, up64, sizeof(*up64)))
201 return -EFAULT;
202 return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
203}
204
205static inline int get_compat_semid_ds(struct semid64_ds *s,
206 struct compat_semid_ds __user *up)
207{
208 if (!access_ok (VERIFY_READ, up, sizeof(*up)))
209 return -EFAULT;
210 return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
211}
212
213static inline int put_compat_semid64_ds(struct semid64_ds *s64,
214 struct compat_semid64_ds __user *up64)
215{
216 int err;
217
218 if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64)))
219 return -EFAULT;
220 err = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
221 err |= __put_user(s64->sem_otime, &up64->sem_otime);
222 err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
223 err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
224 return err;
225}
226
227static inline int put_compat_semid_ds(struct semid64_ds *s,
228 struct compat_semid_ds __user *up)
229{
230 int err;
231
232 if (!access_ok (VERIFY_WRITE, up, sizeof(*up)))
d57d9731 233 return -EFAULT;
1da177e4
LT		 234 err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
235 err |= __put_user(s->sem_otime, &up->sem_otime);
236 err |= __put_user(s->sem_ctime, &up->sem_ctime);
237 err |= __put_user(s->sem_nsems, &up->sem_nsems);
238 return err;
239}
240
48b25c43 241static long do_compat_semctl(int first, int second, int third, u32 pad)
1da177e4
LT		 242{
243 union semun fourth;
1da177e4
LT		 244 int err, err2;
245 struct semid64_ds s64;
246 struct semid64_ds __user *up64;
247 int version = compat_ipc_parse_version(&third);
248
03145beb
DR		 249 memset(&s64, 0, sizeof(s64));
250
1da177e4
LT		 251 if ((third & (~IPC_64)) == SETVAL)
252 fourth.val = (int) pad;
253 else
254 fourth.__pad = compat_ptr(pad);
255 switch (third & (~IPC_64)) {
256 case IPC_INFO:
257 case IPC_RMID:
258 case SEM_INFO:
259 case GETVAL:
260 case GETPID:
261 case GETNCNT:
262 case GETZCNT:
263 case GETALL:
264 case SETVAL:
265 case SETALL:
266 err = sys_semctl(first, second, third, fourth);
267 break;
268
269 case IPC_STAT:
270 case SEM_STAT:
271 up64 = compat_alloc_user_space(sizeof(s64));
272 fourth.__pad = up64;
273 err = sys_semctl(first, second, third, fourth);
274 if (err < 0)
275 break;
276 if (copy_from_user(&s64, up64, sizeof(s64)))
277 err2 = -EFAULT;
278 else if (version == IPC_64)
279 err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
280 else
281 err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
282 if (err2)
283 err = -EFAULT;
284 break;
285
286 case IPC_SET:
287 if (version == IPC_64) {
288 err = get_compat_semid64_ds(&s64, compat_ptr(pad));
289 } else {
290 err = get_compat_semid_ds(&s64, compat_ptr(pad));
291 }
292 up64 = compat_alloc_user_space(sizeof(s64));
293 if (copy_to_user(up64, &s64, sizeof(s64)))
294 err = -EFAULT;
295 if (err)
296 break;
297
298 fourth.__pad = up64;
299 err = sys_semctl(first, second, third, fourth);
300 break;
301
302 default:
303 err = -EINVAL;
304 break;
305 }
306 return err;
307}
308
f9dd87f4
SK		 309long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
310{
311 struct compat_msgbuf __user *msgp = dest;
312 size_t msgsz;
313
314 if (put_user(msg->m_type, &msgp->mtype))
315 return -EFAULT;
316
317 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
318 if (store_msg(msgp->mtext, msg, msgsz))
319 return -EFAULT;
320 return msgsz;
321}
322
48b25c43
CM		 323#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
324long compat_sys_semctl(int first, int second, int third, void __user *uptr)
325{
326 u32 pad;
327
328 if (!uptr)
329 return -EINVAL;
330 if (get_user(pad, (u32 __user *) uptr))
331 return -EFAULT;
332 return do_compat_semctl(first, second, third, pad);
333}
334
1da177e4
LT		 335long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
336{
1da177e4
LT		 337 struct compat_msgbuf __user *up = uptr;
338 long type;
339
340 if (first < 0)
341 return -EINVAL;
651971cb 342 if (second < 0)
1da177e4
LT		 343 return -EINVAL;
344
651971cb 345 if (get_user(type, &up->mtype))
1da177e4
LT		 346 return -EFAULT;
347
651971cb 348 return do_msgsnd(first, type, up->mtext, second, third);
1da177e4
LT		 349}
350
351long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
352 int version, void __user *uptr)
353{
1da177e4
LT		 354 if (first < 0)
355 return -EINVAL;
651971cb 356 if (second < 0)
1da177e4
LT		 357 return -EINVAL;
358
359 if (!version) {
360 struct compat_ipc_kludge ipck;
1da177e4 361 if (!uptr)
f9dd87f4 362 return -EINVAL;
1da177e4 363 if (copy_from_user (&ipck, uptr, sizeof(ipck)))
f9dd87f4 364 return -EFAULT;
1da177e4
LT		 365 uptr = compat_ptr(ipck.msgp);
366 msgtyp = ipck.msgtyp;
367 }
3a665531
SK		 368 return do_msgrcv(first, uptr, second, msgtyp, third,
369 compat_do_msg_fill);
1da177e4 370}
56e41d3c
AV		 371
372COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
373 u32, third, compat_uptr_t, ptr, u32, fifth)
374{
375 int version;
376
377 version = call >> 16; /* hack for backward compatibility */
378 call &= 0xffff;
379
380 switch (call) {
381 case SEMOP:
382 /* struct sembuf is the same on 32 and 64bit :)) */
383 return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
384 case SEMTIMEDOP:
385 return compat_sys_semtimedop(first, compat_ptr(ptr), second,
386 compat_ptr(fifth));
387 case SEMGET:
388 return sys_semget(first, second, third);
389 case SEMCTL:
390 return compat_sys_semctl(first, second, third, compat_ptr(ptr));
391
392 case MSGSND:
393 return compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
394 case MSGRCV:
395 return compat_sys_msgrcv(first, second, fifth, third,
396 version, compat_ptr(ptr));
397 case MSGGET:
398 return sys_msgget(first, second);
399 case MSGCTL:
400 return compat_sys_msgctl(first, second, compat_ptr(ptr));
401
402 case SHMAT:
403 return compat_sys_shmat(first, second, third, version,
404 compat_ptr(ptr));
405 case SHMDT:
406 return sys_shmdt(compat_ptr(ptr));
407 case SHMGET:
408 return sys_shmget(first, (unsigned)second, third);
409 case SHMCTL:
410 return compat_sys_shmctl(first, second, compat_ptr(ptr));
411 }
412
413 return -ENOSYS;
414}
48b25c43
CM		 415#else
416long compat_sys_semctl(int semid, int semnum, int cmd, int arg)
417{
418 return do_compat_semctl(semid, semnum, cmd, arg);
419}
420
421long compat_sys_msgsnd(int msqid, struct compat_msgbuf __user *msgp,
05ba3f1a 422 compat_ssize_t msgsz, int msgflg)
48b25c43
CM		 423{
424 compat_long_t mtype;
425
426 if (get_user(mtype, &msgp->mtype))
427 return -EFAULT;
05ba3f1a 428 return do_msgsnd(msqid, mtype, msgp->mtext, (ssize_t)msgsz, msgflg);
48b25c43
CM		 429}
430
431long compat_sys_msgrcv(int msqid, struct compat_msgbuf __user *msgp,
05ba3f1a 432 compat_ssize_t msgsz, long msgtyp, int msgflg)
48b25c43 433{
f9dd87f4
SK		 434 return do_msgrcv(msqid, msgp, (ssize_t)msgsz, msgtyp, msgflg,
435 compat_do_msg_fill);
48b25c43
CM		 436}
437#endif
1da177e4
LT		 438
439static inline int get_compat_msqid64(struct msqid64_ds *m64,
440 struct compat_msqid64_ds __user *up64)
441{
442 int err;
443
444 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
445 return -EFAULT;
446 err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
447 err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
448 return err;
449}
450
451static inline int get_compat_msqid(struct msqid64_ds *m,
452 struct compat_msqid_ds __user *up)
453{
454 int err;
455
456 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
457 return -EFAULT;
458 err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
459 err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
460 return err;
461}
462
463static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
464 struct compat_msqid64_ds __user *up64)
465{
466 int err;
467
468 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
469 return -EFAULT;
470 err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
471 err |= __put_user(m64->msg_stime, &up64->msg_stime);
472 err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
473 err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
474 err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
475 err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
476 err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
477 err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
478 err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
479 return err;
480}
481
482static inline int put_compat_msqid_ds(struct msqid64_ds *m,
483 struct compat_msqid_ds __user *up)
484{
485 int err;
486
487 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
488 return -EFAULT;
489 err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
490 err |= __put_user(m->msg_stime, &up->msg_stime);
491 err |= __put_user(m->msg_rtime, &up->msg_rtime);
492 err |= __put_user(m->msg_ctime, &up->msg_ctime);
493 err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
494 err |= __put_user(m->msg_qnum, &up->msg_qnum);
495 err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
496 err |= __put_user(m->msg_lspid, &up->msg_lspid);
497 err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
498 return err;
499}
500
501long compat_sys_msgctl(int first, int second, void __user *uptr)
502{
503 int err, err2;
504 struct msqid64_ds m64;
505 int version = compat_ipc_parse_version(&second);
506 void __user *p;
507
03145beb
DR		 508 memset(&m64, 0, sizeof(m64));
509
1da177e4
LT		 510 switch (second & (~IPC_64)) {
511 case IPC_INFO:
512 case IPC_RMID:
513 case MSG_INFO:
514 err = sys_msgctl(first, second, uptr);
515 break;
516
517 case IPC_SET:
518 if (version == IPC_64) {
519 err = get_compat_msqid64(&m64, uptr);
520 } else {
521 err = get_compat_msqid(&m64, uptr);
522 }
523 if (err)
524 break;
525 p = compat_alloc_user_space(sizeof(m64));
526 if (copy_to_user(p, &m64, sizeof(m64)))
527 err = -EFAULT;
528 else
529 err = sys_msgctl(first, second, p);
530 break;
531
532 case IPC_STAT:
533 case MSG_STAT:
534 p = compat_alloc_user_space(sizeof(m64));
535 err = sys_msgctl(first, second, p);
536 if (err < 0)
537 break;
538 if (copy_from_user(&m64, p, sizeof(m64)))
539 err2 = -EFAULT;
540 else if (version == IPC_64)
541 err2 = put_compat_msqid64_ds(&m64, uptr);
542 else
543 err2 = put_compat_msqid_ds(&m64, uptr);
544 if (err2)
545 err = -EFAULT;
546 break;
547
548 default:
549 err = -EINVAL;
550 break;
551 }
552 return err;
553}
554
079a96ae
WD		 555#ifndef COMPAT_SHMLBA
556#define COMPAT_SHMLBA SHMLBA
557#endif
558
48b25c43 559#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
1da177e4
LT		 560long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
561 void __user *uptr)
562{
563 int err;
564 unsigned long raddr;
565 compat_ulong_t __user *uaddr;
566
567 if (version == 1)
568 return -EINVAL;
079a96ae 569 err = do_shmat(first, uptr, second, &raddr, COMPAT_SHMLBA);
1da177e4
LT		 570 if (err < 0)
571 return err;
572 uaddr = compat_ptr(third);
573 return put_user(raddr, uaddr);
574}
48b25c43
CM		 575#else
576long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg)
577{
578 unsigned long ret;
579 long err;
580
079a96ae 581 err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
48b25c43
CM		 582 if (err)
583 return err;
584 force_successful_syscall_return();
585 return (long)ret;
586}
587#endif
1da177e4
LT		 588
589static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
590 struct compat_shmid64_ds __user *up64)
591{
592 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
593 return -EFAULT;
594 return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
595}
596
597static inline int get_compat_shmid_ds(struct shmid64_ds *s,
598 struct compat_shmid_ds __user *up)
599{
600 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
601 return -EFAULT;
602 return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
603}
604
605static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
606 struct compat_shmid64_ds __user *up64)
607{
608 int err;
609
610 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
611 return -EFAULT;
612 err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
613 err |= __put_user(s64->shm_atime, &up64->shm_atime);
614 err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
615 err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
616 err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
617 err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
618 err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
619 err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
620 return err;
621}
622
623static inline int put_compat_shmid_ds(struct shmid64_ds *s,
624 struct compat_shmid_ds __user *up)
625{
626 int err;
627
628 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
629 return -EFAULT;
630 err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
631 err |= __put_user(s->shm_atime, &up->shm_atime);
632 err |= __put_user(s->shm_dtime, &up->shm_dtime);
633 err |= __put_user(s->shm_ctime, &up->shm_ctime);
634 err |= __put_user(s->shm_segsz, &up->shm_segsz);
635 err |= __put_user(s->shm_nattch, &up->shm_nattch);
636 err |= __put_user(s->shm_cpid, &up->shm_cpid);
637 err |= __put_user(s->shm_lpid, &up->shm_lpid);
638 return err;
639}
640
641static inline int put_compat_shminfo64(struct shminfo64 *smi,
642 struct compat_shminfo64 __user *up64)
643{
644 int err;
645
646 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
647 return -EFAULT;
af7c693f
GS		 648 if (smi->shmmax > INT_MAX)
649 smi->shmmax = INT_MAX;
1da177e4
LT		 650 err = __put_user(smi->shmmax, &up64->shmmax);
651 err |= __put_user(smi->shmmin, &up64->shmmin);
652 err |= __put_user(smi->shmmni, &up64->shmmni);
653 err |= __put_user(smi->shmseg, &up64->shmseg);
654 err |= __put_user(smi->shmall, &up64->shmall);
655 return err;
656}
657
658static inline int put_compat_shminfo(struct shminfo64 *smi,
659 struct shminfo __user *up)
660{
661 int err;
662
663 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
664 return -EFAULT;
af7c693f
GS		 665 if (smi->shmmax > INT_MAX)
666 smi->shmmax = INT_MAX;
1da177e4
LT		 667 err = __put_user(smi->shmmax, &up->shmmax);
668 err |= __put_user(smi->shmmin, &up->shmmin);
669 err |= __put_user(smi->shmmni, &up->shmmni);
670 err |= __put_user(smi->shmseg, &up->shmseg);
671 err |= __put_user(smi->shmall, &up->shmall);
214a627c 672 return err;
1da177e4
LT		 673}
674
675static inline int put_compat_shm_info(struct shm_info __user *ip,
676 struct compat_shm_info __user *uip)
677{
678 int err;
679 struct shm_info si;
680
681 if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
682 copy_from_user(&si, ip, sizeof(si)))
683 return -EFAULT;
684 err = __put_user(si.used_ids, &uip->used_ids);
685 err |= __put_user(si.shm_tot, &uip->shm_tot);
686 err |= __put_user(si.shm_rss, &uip->shm_rss);
687 err |= __put_user(si.shm_swp, &uip->shm_swp);
688 err |= __put_user(si.swap_attempts, &uip->swap_attempts);
689 err |= __put_user(si.swap_successes, &uip->swap_successes);
690 return err;
691}
692
693long compat_sys_shmctl(int first, int second, void __user *uptr)
694{
695 void __user *p;
696 struct shmid64_ds s64;
697 struct shminfo64 smi;
698 int err, err2;
699 int version = compat_ipc_parse_version(&second);
700
03145beb
DR		 701 memset(&s64, 0, sizeof(s64));
702
1da177e4
LT		 703 switch (second & (~IPC_64)) {
704 case IPC_RMID:
705 case SHM_LOCK:
706 case SHM_UNLOCK:
707 err = sys_shmctl(first, second, uptr);
708 break;
709
710 case IPC_INFO:
711 p = compat_alloc_user_space(sizeof(smi));
712 err = sys_shmctl(first, second, p);
713 if (err < 0)
714 break;
715 if (copy_from_user(&smi, p, sizeof(smi)))
716 err2 = -EFAULT;
717 else if (version == IPC_64)
718 err2 = put_compat_shminfo64(&smi, uptr);
719 else
720 err2 = put_compat_shminfo(&smi, uptr);
721 if (err2)
722 err = -EFAULT;
723 break;
724
725
726 case IPC_SET:
727 if (version == IPC_64) {
728 err = get_compat_shmid64_ds(&s64, uptr);
729 } else {
730 err = get_compat_shmid_ds(&s64, uptr);
731 }
732 if (err)
733 break;
734 p = compat_alloc_user_space(sizeof(s64));
735 if (copy_to_user(p, &s64, sizeof(s64)))
736 err = -EFAULT;
737 else
738 err = sys_shmctl(first, second, p);
739 break;
740
741 case IPC_STAT:
742 case SHM_STAT:
743 p = compat_alloc_user_space(sizeof(s64));
744 err = sys_shmctl(first, second, p);
745 if (err < 0)
746 break;
747 if (copy_from_user(&s64, p, sizeof(s64)))
748 err2 = -EFAULT;
749 else if (version == IPC_64)
750 err2 = put_compat_shmid64_ds(&s64, uptr);
751 else
752 err2 = put_compat_shmid_ds(&s64, uptr);
753 if (err2)
754 err = -EFAULT;
755 break;
756
757 case SHM_INFO:
758 p = compat_alloc_user_space(sizeof(struct shm_info));
759 err = sys_shmctl(first, second, p);
760 if (err < 0)
761 break;
762 err2 = put_compat_shm_info(p, uptr);
763 if (err2)
764 err = -EFAULT;
765 break;
766
767 default:
768 err = -EINVAL;
769 break;
770 }
771 return err;
772}
773
774long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
775 unsigned nsops, const struct compat_timespec __user *timeout)
776{
777 struct timespec __user *ts64 = NULL;
778 if (timeout) {
779 struct timespec ts;
780 ts64 = compat_alloc_user_space(sizeof(*ts64));
781 if (get_compat_timespec(&ts, timeout))
782 return -EFAULT;
783 if (copy_to_user(ts64, &ts, sizeof(ts)))
784 return -EFAULT;
785 }
786 return sys_semtimedop(semid, tsems, nsops, ts64);
787}
kernel source for telekom puls (alcatel/mediatek)