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

Archive Download this file



interactive