compat.c revision 0e65a81b
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>
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/syscalls.h>
30#include <linux/ptrace.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#ifdef	CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
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;
133#else
134	/* With the asm-generic APIs, we always use the 64-bit versions. */
135	return IPC_64;
136#endif
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;
180	__compat_uid_t u;
181	__compat_gid_t g;
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)))
233		return -EFAULT;
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
241static long do_compat_semctl(int first, int second, int third, u32 pad)
242{
243	union semun fourth;
244	int err, err2;
245	struct semid64_ds s64;
246	struct semid64_ds __user *up64;
247	int version = compat_ipc_parse_version(&third);
248
249	memset(&s64, 0, sizeof(s64));
250
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
309static long 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
323#ifndef COMPAT_SHMLBA
324#define COMPAT_SHMLBA	SHMLBA
325#endif
326
327#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
328COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
329	u32, third, compat_uptr_t, ptr, u32, fifth)
330{
331	int version;
332	u32 pad;
333
334	version = call >> 16; /* hack for backward compatibility */
335	call &= 0xffff;
336
337	switch (call) {
338	case SEMOP:
339		/* struct sembuf is the same on 32 and 64bit :)) */
340		return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
341	case SEMTIMEDOP:
342		return compat_sys_semtimedop(first, compat_ptr(ptr), second,
343						compat_ptr(fifth));
344	case SEMGET:
345		return sys_semget(first, second, third);
346	case SEMCTL:
347		if (!ptr)
348			return -EINVAL;
349		if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
350			return -EFAULT;
351		return do_compat_semctl(first, second, third, pad);
352
353	case MSGSND: {
354		struct compat_msgbuf __user *up = compat_ptr(ptr);
355		compat_long_t type;
356
357		if (first < 0 || second < 0)
358			return -EINVAL;
359
360		if (get_user(type, &up->mtype))
361			return -EFAULT;
362
363		return do_msgsnd(first, type, up->mtext, second, third);
364	}
365	case MSGRCV: {
366		void __user *uptr = compat_ptr(ptr);
367
368		if (first < 0 || second < 0)
369			return -EINVAL;
370
371		if (!version) {
372			struct compat_ipc_kludge ipck;
373			if (!uptr)
374				return -EINVAL;
375			if (copy_from_user (&ipck, uptr, sizeof(ipck)))
376				return -EFAULT;
377			uptr = compat_ptr(ipck.msgp);
378			fifth = ipck.msgtyp;
379		}
380		return do_msgrcv(first, uptr, second, fifth, third,
381				 compat_do_msg_fill);
382	}
383	case MSGGET:
384		return sys_msgget(first, second);
385	case MSGCTL:
386		return compat_sys_msgctl(first, second, compat_ptr(ptr));
387
388	case SHMAT: {
389		int err;
390		unsigned long raddr;
391
392		if (version == 1)
393			return -EINVAL;
394		err = do_shmat(first, compat_ptr(ptr), second, &raddr,
395			       COMPAT_SHMLBA);
396		if (err < 0)
397			return err;
398		return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
399	}
400	case SHMDT:
401		return sys_shmdt(compat_ptr(ptr));
402	case SHMGET:
403		return sys_shmget(first, (unsigned)second, third);
404	case SHMCTL:
405		return compat_sys_shmctl(first, second, compat_ptr(ptr));
406	}
407
408	return -ENOSYS;
409}
410#endif
411
412COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
413{
414	return do_compat_semctl(semid, semnum, cmd, arg);
415}
416
417COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
418		       compat_ssize_t, msgsz, int, msgflg)
419{
420	struct compat_msgbuf __user *up = compat_ptr(msgp);
421	compat_long_t mtype;
422
423	if (get_user(mtype, &up->mtype))
424		return -EFAULT;
425	return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
426}
427
428COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
429		       compat_ssize_t, msgsz, long, msgtyp, int, msgflg)
430{
431	return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, msgtyp,
432			 msgflg, compat_do_msg_fill);
433}
434
435static inline int get_compat_msqid64(struct msqid64_ds *m64,
436				     struct compat_msqid64_ds __user *up64)
437{
438	int err;
439
440	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
441		return -EFAULT;
442	err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
443	err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
444	return err;
445}
446
447static inline int get_compat_msqid(struct msqid64_ds *m,
448				   struct compat_msqid_ds __user *up)
449{
450	int err;
451
452	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
453		return -EFAULT;
454	err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
455	err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
456	return err;
457}
458
459static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
460				 struct compat_msqid64_ds __user *up64)
461{
462	int err;
463
464	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
465		return -EFAULT;
466	err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
467	err |= __put_user(m64->msg_stime, &up64->msg_stime);
468	err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
469	err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
470	err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
471	err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
472	err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
473	err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
474	err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
475	return err;
476}
477
478static inline int put_compat_msqid_ds(struct msqid64_ds *m,
479				      struct compat_msqid_ds __user *up)
480{
481	int err;
482
483	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
484		return -EFAULT;
485	err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
486	err |= __put_user(m->msg_stime, &up->msg_stime);
487	err |= __put_user(m->msg_rtime, &up->msg_rtime);
488	err |= __put_user(m->msg_ctime, &up->msg_ctime);
489	err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
490	err |= __put_user(m->msg_qnum, &up->msg_qnum);
491	err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
492	err |= __put_user(m->msg_lspid, &up->msg_lspid);
493	err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
494	return err;
495}
496
497long compat_sys_msgctl(int first, int second, void __user *uptr)
498{
499	int err, err2;
500	struct msqid64_ds m64;
501	int version = compat_ipc_parse_version(&second);
502	void __user *p;
503
504	memset(&m64, 0, sizeof(m64));
505
506	switch (second & (~IPC_64)) {
507	case IPC_INFO:
508	case IPC_RMID:
509	case MSG_INFO:
510		err = sys_msgctl(first, second, uptr);
511		break;
512
513	case IPC_SET:
514		if (version == IPC_64) {
515			err = get_compat_msqid64(&m64, uptr);
516		} else {
517			err = get_compat_msqid(&m64, uptr);
518		}
519		if (err)
520			break;
521		p = compat_alloc_user_space(sizeof(m64));
522		if (copy_to_user(p, &m64, sizeof(m64)))
523			err = -EFAULT;
524		else
525			err = sys_msgctl(first, second, p);
526		break;
527
528	case IPC_STAT:
529	case MSG_STAT:
530		p = compat_alloc_user_space(sizeof(m64));
531		err = sys_msgctl(first, second, p);
532		if (err < 0)
533			break;
534		if (copy_from_user(&m64, p, sizeof(m64)))
535			err2 = -EFAULT;
536		else if (version == IPC_64)
537			err2 = put_compat_msqid64_ds(&m64, uptr);
538		else
539			err2 = put_compat_msqid_ds(&m64, uptr);
540		if (err2)
541			err = -EFAULT;
542		break;
543
544	default:
545		err = -EINVAL;
546		break;
547	}
548	return err;
549}
550
551COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
552{
553	unsigned long ret;
554	long err;
555
556	err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
557	if (err)
558		return err;
559	force_successful_syscall_return();
560	return (long)ret;
561}
562
563static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
564					struct compat_shmid64_ds __user *up64)
565{
566	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
567		return -EFAULT;
568	return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
569}
570
571static inline int get_compat_shmid_ds(struct shmid64_ds *s,
572				      struct compat_shmid_ds __user *up)
573{
574	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
575		return -EFAULT;
576	return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
577}
578
579static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
580					struct compat_shmid64_ds __user *up64)
581{
582	int err;
583
584	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
585		return -EFAULT;
586	err  = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
587	err |= __put_user(s64->shm_atime, &up64->shm_atime);
588	err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
589	err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
590	err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
591	err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
592	err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
593	err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
594	return err;
595}
596
597static inline int put_compat_shmid_ds(struct shmid64_ds *s,
598				      struct compat_shmid_ds __user *up)
599{
600	int err;
601
602	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
603		return -EFAULT;
604	err  = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
605	err |= __put_user(s->shm_atime, &up->shm_atime);
606	err |= __put_user(s->shm_dtime, &up->shm_dtime);
607	err |= __put_user(s->shm_ctime, &up->shm_ctime);
608	err |= __put_user(s->shm_segsz, &up->shm_segsz);
609	err |= __put_user(s->shm_nattch, &up->shm_nattch);
610	err |= __put_user(s->shm_cpid, &up->shm_cpid);
611	err |= __put_user(s->shm_lpid, &up->shm_lpid);
612	return err;
613}
614
615static inline int put_compat_shminfo64(struct shminfo64 *smi,
616				       struct compat_shminfo64 __user *up64)
617{
618	int err;
619
620	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
621		return -EFAULT;
622	if (smi->shmmax > INT_MAX)
623		smi->shmmax = INT_MAX;
624	err  = __put_user(smi->shmmax, &up64->shmmax);
625	err |= __put_user(smi->shmmin, &up64->shmmin);
626	err |= __put_user(smi->shmmni, &up64->shmmni);
627	err |= __put_user(smi->shmseg, &up64->shmseg);
628	err |= __put_user(smi->shmall, &up64->shmall);
629	return err;
630}
631
632static inline int put_compat_shminfo(struct shminfo64 *smi,
633				     struct shminfo __user *up)
634{
635	int err;
636
637	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
638		return -EFAULT;
639	if (smi->shmmax > INT_MAX)
640		smi->shmmax = INT_MAX;
641	err  = __put_user(smi->shmmax, &up->shmmax);
642	err |= __put_user(smi->shmmin, &up->shmmin);
643	err |= __put_user(smi->shmmni, &up->shmmni);
644	err |= __put_user(smi->shmseg, &up->shmseg);
645	err |= __put_user(smi->shmall, &up->shmall);
646	return err;
647}
648
649static inline int put_compat_shm_info(struct shm_info __user *ip,
650				      struct compat_shm_info __user *uip)
651{
652	int err;
653	struct shm_info si;
654
655	if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
656	    copy_from_user(&si, ip, sizeof(si)))
657		return -EFAULT;
658	err  = __put_user(si.used_ids, &uip->used_ids);
659	err |= __put_user(si.shm_tot, &uip->shm_tot);
660	err |= __put_user(si.shm_rss, &uip->shm_rss);
661	err |= __put_user(si.shm_swp, &uip->shm_swp);
662	err |= __put_user(si.swap_attempts, &uip->swap_attempts);
663	err |= __put_user(si.swap_successes, &uip->swap_successes);
664	return err;
665}
666
667long compat_sys_shmctl(int first, int second, void __user *uptr)
668{
669	void __user *p;
670	struct shmid64_ds s64;
671	struct shminfo64 smi;
672	int err, err2;
673	int version = compat_ipc_parse_version(&second);
674
675	memset(&s64, 0, sizeof(s64));
676
677	switch (second & (~IPC_64)) {
678	case IPC_RMID:
679	case SHM_LOCK:
680	case SHM_UNLOCK:
681		err = sys_shmctl(first, second, uptr);
682		break;
683
684	case IPC_INFO:
685		p = compat_alloc_user_space(sizeof(smi));
686		err = sys_shmctl(first, second, p);
687		if (err < 0)
688			break;
689		if (copy_from_user(&smi, p, sizeof(smi)))
690			err2 = -EFAULT;
691		else if (version == IPC_64)
692			err2 = put_compat_shminfo64(&smi, uptr);
693		else
694			err2 = put_compat_shminfo(&smi, uptr);
695		if (err2)
696			err = -EFAULT;
697		break;
698
699
700	case IPC_SET:
701		if (version == IPC_64) {
702			err = get_compat_shmid64_ds(&s64, uptr);
703		} else {
704			err = get_compat_shmid_ds(&s64, uptr);
705		}
706		if (err)
707			break;
708		p = compat_alloc_user_space(sizeof(s64));
709		if (copy_to_user(p, &s64, sizeof(s64)))
710			err = -EFAULT;
711		else
712			err = sys_shmctl(first, second, p);
713		break;
714
715	case IPC_STAT:
716	case SHM_STAT:
717		p = compat_alloc_user_space(sizeof(s64));
718		err = sys_shmctl(first, second, p);
719		if (err < 0)
720			break;
721		if (copy_from_user(&s64, p, sizeof(s64)))
722			err2 = -EFAULT;
723		else if (version == IPC_64)
724			err2 = put_compat_shmid64_ds(&s64, uptr);
725		else
726			err2 = put_compat_shmid_ds(&s64, uptr);
727		if (err2)
728			err = -EFAULT;
729		break;
730
731	case SHM_INFO:
732		p = compat_alloc_user_space(sizeof(struct shm_info));
733		err = sys_shmctl(first, second, p);
734		if (err < 0)
735			break;
736		err2 = put_compat_shm_info(p, uptr);
737		if (err2)
738			err = -EFAULT;
739		break;
740
741	default:
742		err = -EINVAL;
743		break;
744	}
745	return err;
746}
747
748long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
749		unsigned nsops, const struct compat_timespec __user *timeout)
750{
751	struct timespec __user *ts64 = NULL;
752	if (timeout) {
753		struct timespec ts;
754		ts64 = compat_alloc_user_space(sizeof(*ts64));
755		if (get_compat_timespec(&ts, timeout))
756			return -EFAULT;
757		if (copy_to_user(ts64, &ts, sizeof(ts)))
758			return -EFAULT;
759	}
760	return sys_semtimedop(semid, tsems, nsops, ts64);
761}
762