Root/ipc/compat.c

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
309#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
310long compat_sys_semctl(int first, int second, int third, void __user *uptr)
311{
312    u32 pad;
313
314    if (!uptr)
315        return -EINVAL;
316    if (get_user(pad, (u32 __user *) uptr))
317        return -EFAULT;
318    return do_compat_semctl(first, second, third, pad);
319}
320
321long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
322{
323    struct compat_msgbuf __user *up = uptr;
324    long type;
325
326    if (first < 0)
327        return -EINVAL;
328    if (second < 0)
329        return -EINVAL;
330
331    if (get_user(type, &up->mtype))
332        return -EFAULT;
333
334    return do_msgsnd(first, type, up->mtext, second, third);
335}
336
337long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
338               int version, void __user *uptr)
339{
340    struct compat_msgbuf __user *up;
341    long type;
342    int err;
343
344    if (first < 0)
345        return -EINVAL;
346    if (second < 0)
347        return -EINVAL;
348
349    if (!version) {
350        struct compat_ipc_kludge ipck;
351        err = -EINVAL;
352        if (!uptr)
353            goto out;
354        err = -EFAULT;
355        if (copy_from_user (&ipck, uptr, sizeof(ipck)))
356            goto out;
357        uptr = compat_ptr(ipck.msgp);
358        msgtyp = ipck.msgtyp;
359    }
360    up = uptr;
361    err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
362    if (err < 0)
363        goto out;
364    if (put_user(type, &up->mtype))
365        err = -EFAULT;
366out:
367    return err;
368}
369#else
370long compat_sys_semctl(int semid, int semnum, int cmd, int arg)
371{
372    return do_compat_semctl(semid, semnum, cmd, arg);
373}
374
375long compat_sys_msgsnd(int msqid, struct compat_msgbuf __user *msgp,
376               compat_ssize_t msgsz, int msgflg)
377{
378    compat_long_t mtype;
379
380    if (get_user(mtype, &msgp->mtype))
381        return -EFAULT;
382    return do_msgsnd(msqid, mtype, msgp->mtext, (ssize_t)msgsz, msgflg);
383}
384
385long compat_sys_msgrcv(int msqid, struct compat_msgbuf __user *msgp,
386               compat_ssize_t msgsz, long msgtyp, int msgflg)
387{
388    long err, mtype;
389
390    err = do_msgrcv(msqid, &mtype, msgp->mtext, (ssize_t)msgsz, msgtyp, msgflg);
391    if (err < 0)
392        goto out;
393
394    if (put_user(mtype, &msgp->mtype))
395        err = -EFAULT;
396 out:
397    return err;
398}
399#endif
400
401static inline int get_compat_msqid64(struct msqid64_ds *m64,
402                     struct compat_msqid64_ds __user *up64)
403{
404    int err;
405
406    if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
407        return -EFAULT;
408    err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
409    err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
410    return err;
411}
412
413static inline int get_compat_msqid(struct msqid64_ds *m,
414                   struct compat_msqid_ds __user *up)
415{
416    int err;
417
418    if (!access_ok(VERIFY_READ, up, sizeof(*up)))
419        return -EFAULT;
420    err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
421    err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
422    return err;
423}
424
425static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
426                 struct compat_msqid64_ds __user *up64)
427{
428    int err;
429
430    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
431        return -EFAULT;
432    err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
433    err |= __put_user(m64->msg_stime, &up64->msg_stime);
434    err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
435    err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
436    err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
437    err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
438    err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
439    err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
440    err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
441    return err;
442}
443
444static inline int put_compat_msqid_ds(struct msqid64_ds *m,
445                      struct compat_msqid_ds __user *up)
446{
447    int err;
448
449    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
450        return -EFAULT;
451    err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
452    err |= __put_user(m->msg_stime, &up->msg_stime);
453    err |= __put_user(m->msg_rtime, &up->msg_rtime);
454    err |= __put_user(m->msg_ctime, &up->msg_ctime);
455    err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
456    err |= __put_user(m->msg_qnum, &up->msg_qnum);
457    err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
458    err |= __put_user(m->msg_lspid, &up->msg_lspid);
459    err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
460    return err;
461}
462
463long compat_sys_msgctl(int first, int second, void __user *uptr)
464{
465    int err, err2;
466    struct msqid64_ds m64;
467    int version = compat_ipc_parse_version(&second);
468    void __user *p;
469
470    memset(&m64, 0, sizeof(m64));
471
472    switch (second & (~IPC_64)) {
473    case IPC_INFO:
474    case IPC_RMID:
475    case MSG_INFO:
476        err = sys_msgctl(first, second, uptr);
477        break;
478
479    case IPC_SET:
480        if (version == IPC_64) {
481            err = get_compat_msqid64(&m64, uptr);
482        } else {
483            err = get_compat_msqid(&m64, uptr);
484        }
485        if (err)
486            break;
487        p = compat_alloc_user_space(sizeof(m64));
488        if (copy_to_user(p, &m64, sizeof(m64)))
489            err = -EFAULT;
490        else
491            err = sys_msgctl(first, second, p);
492        break;
493
494    case IPC_STAT:
495    case MSG_STAT:
496        p = compat_alloc_user_space(sizeof(m64));
497        err = sys_msgctl(first, second, p);
498        if (err < 0)
499            break;
500        if (copy_from_user(&m64, p, sizeof(m64)))
501            err2 = -EFAULT;
502        else if (version == IPC_64)
503            err2 = put_compat_msqid64_ds(&m64, uptr);
504        else
505            err2 = put_compat_msqid_ds(&m64, uptr);
506        if (err2)
507            err = -EFAULT;
508        break;
509
510    default:
511        err = -EINVAL;
512        break;
513    }
514    return err;
515}
516
517#ifndef COMPAT_SHMLBA
518#define COMPAT_SHMLBA SHMLBA
519#endif
520
521#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
522long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
523            void __user *uptr)
524{
525    int err;
526    unsigned long raddr;
527    compat_ulong_t __user *uaddr;
528
529    if (version == 1)
530        return -EINVAL;
531    err = do_shmat(first, uptr, second, &raddr, COMPAT_SHMLBA);
532    if (err < 0)
533        return err;
534    uaddr = compat_ptr(third);
535    return put_user(raddr, uaddr);
536}
537#else
538long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg)
539{
540    unsigned long ret;
541    long err;
542
543    err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
544    if (err)
545        return err;
546    force_successful_syscall_return();
547    return (long)ret;
548}
549#endif
550
551static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
552                    struct compat_shmid64_ds __user *up64)
553{
554    if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
555        return -EFAULT;
556    return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
557}
558
559static inline int get_compat_shmid_ds(struct shmid64_ds *s,
560                      struct compat_shmid_ds __user *up)
561{
562    if (!access_ok(VERIFY_READ, up, sizeof(*up)))
563        return -EFAULT;
564    return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
565}
566
567static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
568                    struct compat_shmid64_ds __user *up64)
569{
570    int err;
571
572    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
573        return -EFAULT;
574    err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
575    err |= __put_user(s64->shm_atime, &up64->shm_atime);
576    err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
577    err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
578    err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
579    err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
580    err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
581    err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
582    return err;
583}
584
585static inline int put_compat_shmid_ds(struct shmid64_ds *s,
586                      struct compat_shmid_ds __user *up)
587{
588    int err;
589
590    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
591        return -EFAULT;
592    err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
593    err |= __put_user(s->shm_atime, &up->shm_atime);
594    err |= __put_user(s->shm_dtime, &up->shm_dtime);
595    err |= __put_user(s->shm_ctime, &up->shm_ctime);
596    err |= __put_user(s->shm_segsz, &up->shm_segsz);
597    err |= __put_user(s->shm_nattch, &up->shm_nattch);
598    err |= __put_user(s->shm_cpid, &up->shm_cpid);
599    err |= __put_user(s->shm_lpid, &up->shm_lpid);
600    return err;
601}
602
603static inline int put_compat_shminfo64(struct shminfo64 *smi,
604                       struct compat_shminfo64 __user *up64)
605{
606    int err;
607
608    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
609        return -EFAULT;
610    if (smi->shmmax > INT_MAX)
611        smi->shmmax = INT_MAX;
612    err = __put_user(smi->shmmax, &up64->shmmax);
613    err |= __put_user(smi->shmmin, &up64->shmmin);
614    err |= __put_user(smi->shmmni, &up64->shmmni);
615    err |= __put_user(smi->shmseg, &up64->shmseg);
616    err |= __put_user(smi->shmall, &up64->shmall);
617    return err;
618}
619
620static inline int put_compat_shminfo(struct shminfo64 *smi,
621                     struct shminfo __user *up)
622{
623    int err;
624
625    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
626        return -EFAULT;
627    if (smi->shmmax > INT_MAX)
628        smi->shmmax = INT_MAX;
629    err = __put_user(smi->shmmax, &up->shmmax);
630    err |= __put_user(smi->shmmin, &up->shmmin);
631    err |= __put_user(smi->shmmni, &up->shmmni);
632    err |= __put_user(smi->shmseg, &up->shmseg);
633    err |= __put_user(smi->shmall, &up->shmall);
634    return err;
635}
636
637static inline int put_compat_shm_info(struct shm_info __user *ip,
638                      struct compat_shm_info __user *uip)
639{
640    int err;
641    struct shm_info si;
642
643    if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
644        copy_from_user(&si, ip, sizeof(si)))
645        return -EFAULT;
646    err = __put_user(si.used_ids, &uip->used_ids);
647    err |= __put_user(si.shm_tot, &uip->shm_tot);
648    err |= __put_user(si.shm_rss, &uip->shm_rss);
649    err |= __put_user(si.shm_swp, &uip->shm_swp);
650    err |= __put_user(si.swap_attempts, &uip->swap_attempts);
651    err |= __put_user(si.swap_successes, &uip->swap_successes);
652    return err;
653}
654
655long compat_sys_shmctl(int first, int second, void __user *uptr)
656{
657    void __user *p;
658    struct shmid64_ds s64;
659    struct shminfo64 smi;
660    int err, err2;
661    int version = compat_ipc_parse_version(&second);
662
663    memset(&s64, 0, sizeof(s64));
664
665    switch (second & (~IPC_64)) {
666    case IPC_RMID:
667    case SHM_LOCK:
668    case SHM_UNLOCK:
669        err = sys_shmctl(first, second, uptr);
670        break;
671
672    case IPC_INFO:
673        p = compat_alloc_user_space(sizeof(smi));
674        err = sys_shmctl(first, second, p);
675        if (err < 0)
676            break;
677        if (copy_from_user(&smi, p, sizeof(smi)))
678            err2 = -EFAULT;
679        else if (version == IPC_64)
680            err2 = put_compat_shminfo64(&smi, uptr);
681        else
682            err2 = put_compat_shminfo(&smi, uptr);
683        if (err2)
684            err = -EFAULT;
685        break;
686
687
688    case IPC_SET:
689        if (version == IPC_64) {
690            err = get_compat_shmid64_ds(&s64, uptr);
691        } else {
692            err = get_compat_shmid_ds(&s64, uptr);
693        }
694        if (err)
695            break;
696        p = compat_alloc_user_space(sizeof(s64));
697        if (copy_to_user(p, &s64, sizeof(s64)))
698            err = -EFAULT;
699        else
700            err = sys_shmctl(first, second, p);
701        break;
702
703    case IPC_STAT:
704    case SHM_STAT:
705        p = compat_alloc_user_space(sizeof(s64));
706        err = sys_shmctl(first, second, p);
707        if (err < 0)
708            break;
709        if (copy_from_user(&s64, p, sizeof(s64)))
710            err2 = -EFAULT;
711        else if (version == IPC_64)
712            err2 = put_compat_shmid64_ds(&s64, uptr);
713        else
714            err2 = put_compat_shmid_ds(&s64, uptr);
715        if (err2)
716            err = -EFAULT;
717        break;
718
719    case SHM_INFO:
720        p = compat_alloc_user_space(sizeof(struct shm_info));
721        err = sys_shmctl(first, second, p);
722        if (err < 0)
723            break;
724        err2 = put_compat_shm_info(p, uptr);
725        if (err2)
726            err = -EFAULT;
727        break;
728
729    default:
730        err = -EINVAL;
731        break;
732    }
733    return err;
734}
735
736long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
737        unsigned nsops, const struct compat_timespec __user *timeout)
738{
739    struct timespec __user *ts64 = NULL;
740    if (timeout) {
741        struct timespec ts;
742        ts64 = compat_alloc_user_space(sizeof(*ts64));
743        if (get_compat_timespec(&ts, timeout))
744            return -EFAULT;
745        if (copy_to_user(ts64, &ts, sizeof(ts)))
746            return -EFAULT;
747    }
748    return sys_semtimedop(semid, tsems, nsops, ts64);
749}
750

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