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
31#include <linux/mutex.h>
32#include <asm/uaccess.h>
33
34#include "util.h"
35
36struct compat_msgbuf {
37    compat_long_t mtype;
38    char mtext[1];
39};
40
41struct compat_ipc_perm {
42    key_t key;
43    __compat_uid_t uid;
44    __compat_gid_t gid;
45    __compat_uid_t cuid;
46    __compat_gid_t cgid;
47    compat_mode_t mode;
48    unsigned short seq;
49};
50
51struct compat_semid_ds {
52    struct compat_ipc_perm sem_perm;
53    compat_time_t sem_otime;
54    compat_time_t sem_ctime;
55    compat_uptr_t sem_base;
56    compat_uptr_t sem_pending;
57    compat_uptr_t sem_pending_last;
58    compat_uptr_t undo;
59    unsigned short sem_nsems;
60};
61
62struct compat_msqid_ds {
63    struct compat_ipc_perm msg_perm;
64    compat_uptr_t msg_first;
65    compat_uptr_t msg_last;
66    compat_time_t msg_stime;
67    compat_time_t msg_rtime;
68    compat_time_t msg_ctime;
69    compat_ulong_t msg_lcbytes;
70    compat_ulong_t msg_lqbytes;
71    unsigned short msg_cbytes;
72    unsigned short msg_qnum;
73    unsigned short msg_qbytes;
74    compat_ipc_pid_t msg_lspid;
75    compat_ipc_pid_t msg_lrpid;
76};
77
78struct compat_shmid_ds {
79    struct compat_ipc_perm shm_perm;
80    int shm_segsz;
81    compat_time_t shm_atime;
82    compat_time_t shm_dtime;
83    compat_time_t shm_ctime;
84    compat_ipc_pid_t shm_cpid;
85    compat_ipc_pid_t shm_lpid;
86    unsigned short shm_nattch;
87    unsigned short shm_unused;
88    compat_uptr_t shm_unused2;
89    compat_uptr_t shm_unused3;
90};
91
92struct compat_ipc_kludge {
93    compat_uptr_t msgp;
94    compat_long_t msgtyp;
95};
96
97struct compat_shminfo64 {
98    compat_ulong_t shmmax;
99    compat_ulong_t shmmin;
100    compat_ulong_t shmmni;
101    compat_ulong_t shmseg;
102    compat_ulong_t shmall;
103    compat_ulong_t __unused1;
104    compat_ulong_t __unused2;
105    compat_ulong_t __unused3;
106    compat_ulong_t __unused4;
107};
108
109struct compat_shm_info {
110    compat_int_t used_ids;
111    compat_ulong_t shm_tot, shm_rss, shm_swp;
112    compat_ulong_t swap_attempts, swap_successes;
113};
114
115extern int sem_ctls[];
116#define sc_semopm (sem_ctls[2])
117
118static inline int compat_ipc_parse_version(int *cmd)
119{
120    int version = *cmd & IPC_64;
121
122    /* this is tricky: architectures that have support for the old
123     * ipc structures in 64 bit binaries need to have IPC_64 set
124     * in cmd, the others need to have it cleared */
125#ifndef ipc_parse_version
126    *cmd |= IPC_64;
127#else
128    *cmd &= ~IPC_64;
129#endif
130    return version;
131}
132
133static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
134                      struct compat_ipc64_perm __user *up64)
135{
136    int err;
137
138    err = __get_user(p64->uid, &up64->uid);
139    err |= __get_user(p64->gid, &up64->gid);
140    err |= __get_user(p64->mode, &up64->mode);
141    return err;
142}
143
144static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
145                    struct compat_ipc_perm __user *up)
146{
147    int err;
148
149    err = __get_user(p->uid, &up->uid);
150    err |= __get_user(p->gid, &up->gid);
151    err |= __get_user(p->mode, &up->mode);
152    return err;
153}
154
155static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
156                      struct compat_ipc64_perm __user *up64)
157{
158    int err;
159
160    err = __put_user(p64->key, &up64->key);
161    err |= __put_user(p64->uid, &up64->uid);
162    err |= __put_user(p64->gid, &up64->gid);
163    err |= __put_user(p64->cuid, &up64->cuid);
164    err |= __put_user(p64->cgid, &up64->cgid);
165    err |= __put_user(p64->mode, &up64->mode);
166    err |= __put_user(p64->seq, &up64->seq);
167    return err;
168}
169
170static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
171                    struct compat_ipc_perm __user *up)
172{
173    int err;
174    __compat_uid_t u;
175    __compat_gid_t g;
176
177    err = __put_user(p->key, &up->key);
178    SET_UID(u, p->uid);
179    err |= __put_user(u, &up->uid);
180    SET_GID(g, p->gid);
181    err |= __put_user(g, &up->gid);
182    SET_UID(u, p->cuid);
183    err |= __put_user(u, &up->cuid);
184    SET_GID(g, p->cgid);
185    err |= __put_user(g, &up->cgid);
186    err |= __put_user(p->mode, &up->mode);
187    err |= __put_user(p->seq, &up->seq);
188    return err;
189}
190
191static inline int get_compat_semid64_ds(struct semid64_ds *s64,
192                    struct compat_semid64_ds __user *up64)
193{
194    if (!access_ok (VERIFY_READ, up64, sizeof(*up64)))
195        return -EFAULT;
196    return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
197}
198
199static inline int get_compat_semid_ds(struct semid64_ds *s,
200                      struct compat_semid_ds __user *up)
201{
202    if (!access_ok (VERIFY_READ, up, sizeof(*up)))
203        return -EFAULT;
204    return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
205}
206
207static inline int put_compat_semid64_ds(struct semid64_ds *s64,
208                    struct compat_semid64_ds __user *up64)
209{
210    int err;
211
212    if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64)))
213        return -EFAULT;
214    err = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
215    err |= __put_user(s64->sem_otime, &up64->sem_otime);
216    err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
217    err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
218    return err;
219}
220
221static inline int put_compat_semid_ds(struct semid64_ds *s,
222                      struct compat_semid_ds __user *up)
223{
224    int err;
225
226    if (!access_ok (VERIFY_WRITE, up, sizeof(*up)))
227        return -EFAULT;
228    err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
229    err |= __put_user(s->sem_otime, &up->sem_otime);
230    err |= __put_user(s->sem_ctime, &up->sem_ctime);
231    err |= __put_user(s->sem_nsems, &up->sem_nsems);
232    return err;
233}
234
235long compat_sys_semctl(int first, int second, int third, void __user *uptr)
236{
237    union semun fourth;
238    u32 pad;
239    int err, err2;
240    struct semid64_ds s64;
241    struct semid64_ds __user *up64;
242    int version = compat_ipc_parse_version(&third);
243
244    if (!uptr)
245        return -EINVAL;
246    if (get_user(pad, (u32 __user *) uptr))
247        return -EFAULT;
248    if ((third & (~IPC_64)) == SETVAL)
249        fourth.val = (int) pad;
250    else
251        fourth.__pad = compat_ptr(pad);
252    switch (third & (~IPC_64)) {
253    case IPC_INFO:
254    case IPC_RMID:
255    case SEM_INFO:
256    case GETVAL:
257    case GETPID:
258    case GETNCNT:
259    case GETZCNT:
260    case GETALL:
261    case SETVAL:
262    case SETALL:
263        err = sys_semctl(first, second, third, fourth);
264        break;
265
266    case IPC_STAT:
267    case SEM_STAT:
268        up64 = compat_alloc_user_space(sizeof(s64));
269        fourth.__pad = up64;
270        err = sys_semctl(first, second, third, fourth);
271        if (err < 0)
272            break;
273        if (copy_from_user(&s64, up64, sizeof(s64)))
274            err2 = -EFAULT;
275        else if (version == IPC_64)
276            err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
277        else
278            err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
279        if (err2)
280            err = -EFAULT;
281        break;
282
283    case IPC_SET:
284        if (version == IPC_64) {
285            err = get_compat_semid64_ds(&s64, compat_ptr(pad));
286        } else {
287            err = get_compat_semid_ds(&s64, compat_ptr(pad));
288        }
289        up64 = compat_alloc_user_space(sizeof(s64));
290        if (copy_to_user(up64, &s64, sizeof(s64)))
291            err = -EFAULT;
292        if (err)
293            break;
294
295        fourth.__pad = up64;
296        err = sys_semctl(first, second, third, fourth);
297        break;
298
299    default:
300        err = -EINVAL;
301        break;
302    }
303    return err;
304}
305
306long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
307{
308    struct compat_msgbuf __user *up = uptr;
309    long type;
310
311    if (first < 0)
312        return -EINVAL;
313    if (second < 0)
314        return -EINVAL;
315
316    if (get_user(type, &up->mtype))
317        return -EFAULT;
318
319    return do_msgsnd(first, type, up->mtext, second, third);
320}
321
322long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
323               int version, void __user *uptr)
324{
325    struct compat_msgbuf __user *up;
326    long type;
327    int err;
328
329    if (first < 0)
330        return -EINVAL;
331    if (second < 0)
332        return -EINVAL;
333
334    if (!version) {
335        struct compat_ipc_kludge ipck;
336        err = -EINVAL;
337        if (!uptr)
338            goto out;
339        err = -EFAULT;
340        if (copy_from_user (&ipck, uptr, sizeof(ipck)))
341            goto out;
342        uptr = compat_ptr(ipck.msgp);
343        msgtyp = ipck.msgtyp;
344    }
345    up = uptr;
346    err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
347    if (err < 0)
348        goto out;
349    if (put_user(type, &up->mtype))
350        err = -EFAULT;
351out:
352    return err;
353}
354
355static inline int get_compat_msqid64(struct msqid64_ds *m64,
356                     struct compat_msqid64_ds __user *up64)
357{
358    int err;
359
360    if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
361        return -EFAULT;
362    err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
363    err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
364    return err;
365}
366
367static inline int get_compat_msqid(struct msqid64_ds *m,
368                   struct compat_msqid_ds __user *up)
369{
370    int err;
371
372    if (!access_ok(VERIFY_READ, up, sizeof(*up)))
373        return -EFAULT;
374    err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
375    err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
376    return err;
377}
378
379static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
380                 struct compat_msqid64_ds __user *up64)
381{
382    int err;
383
384    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
385        return -EFAULT;
386    err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
387    err |= __put_user(m64->msg_stime, &up64->msg_stime);
388    err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
389    err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
390    err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
391    err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
392    err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
393    err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
394    err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
395    return err;
396}
397
398static inline int put_compat_msqid_ds(struct msqid64_ds *m,
399                      struct compat_msqid_ds __user *up)
400{
401    int err;
402
403    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
404        return -EFAULT;
405    err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
406    err |= __put_user(m->msg_stime, &up->msg_stime);
407    err |= __put_user(m->msg_rtime, &up->msg_rtime);
408    err |= __put_user(m->msg_ctime, &up->msg_ctime);
409    err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
410    err |= __put_user(m->msg_qnum, &up->msg_qnum);
411    err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
412    err |= __put_user(m->msg_lspid, &up->msg_lspid);
413    err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
414    return err;
415}
416
417long compat_sys_msgctl(int first, int second, void __user *uptr)
418{
419    int err, err2;
420    struct msqid64_ds m64;
421    int version = compat_ipc_parse_version(&second);
422    void __user *p;
423
424    switch (second & (~IPC_64)) {
425    case IPC_INFO:
426    case IPC_RMID:
427    case MSG_INFO:
428        err = sys_msgctl(first, second, uptr);
429        break;
430
431    case IPC_SET:
432        if (version == IPC_64) {
433            err = get_compat_msqid64(&m64, uptr);
434        } else {
435            err = get_compat_msqid(&m64, uptr);
436        }
437        if (err)
438            break;
439        p = compat_alloc_user_space(sizeof(m64));
440        if (copy_to_user(p, &m64, sizeof(m64)))
441            err = -EFAULT;
442        else
443            err = sys_msgctl(first, second, p);
444        break;
445
446    case IPC_STAT:
447    case MSG_STAT:
448        p = compat_alloc_user_space(sizeof(m64));
449        err = sys_msgctl(first, second, p);
450        if (err < 0)
451            break;
452        if (copy_from_user(&m64, p, sizeof(m64)))
453            err2 = -EFAULT;
454        else if (version == IPC_64)
455            err2 = put_compat_msqid64_ds(&m64, uptr);
456        else
457            err2 = put_compat_msqid_ds(&m64, uptr);
458        if (err2)
459            err = -EFAULT;
460        break;
461
462    default:
463        err = -EINVAL;
464        break;
465    }
466    return err;
467}
468
469long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
470            void __user *uptr)
471{
472    int err;
473    unsigned long raddr;
474    compat_ulong_t __user *uaddr;
475
476    if (version == 1)
477        return -EINVAL;
478    err = do_shmat(first, uptr, second, &raddr);
479    if (err < 0)
480        return err;
481    uaddr = compat_ptr(third);
482    return put_user(raddr, uaddr);
483}
484
485static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
486                    struct compat_shmid64_ds __user *up64)
487{
488    if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
489        return -EFAULT;
490    return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
491}
492
493static inline int get_compat_shmid_ds(struct shmid64_ds *s,
494                      struct compat_shmid_ds __user *up)
495{
496    if (!access_ok(VERIFY_READ, up, sizeof(*up)))
497        return -EFAULT;
498    return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
499}
500
501static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
502                    struct compat_shmid64_ds __user *up64)
503{
504    int err;
505
506    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
507        return -EFAULT;
508    err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
509    err |= __put_user(s64->shm_atime, &up64->shm_atime);
510    err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
511    err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
512    err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
513    err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
514    err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
515    err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
516    return err;
517}
518
519static inline int put_compat_shmid_ds(struct shmid64_ds *s,
520                      struct compat_shmid_ds __user *up)
521{
522    int err;
523
524    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
525        return -EFAULT;
526    err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
527    err |= __put_user(s->shm_atime, &up->shm_atime);
528    err |= __put_user(s->shm_dtime, &up->shm_dtime);
529    err |= __put_user(s->shm_ctime, &up->shm_ctime);
530    err |= __put_user(s->shm_segsz, &up->shm_segsz);
531    err |= __put_user(s->shm_nattch, &up->shm_nattch);
532    err |= __put_user(s->shm_cpid, &up->shm_cpid);
533    err |= __put_user(s->shm_lpid, &up->shm_lpid);
534    return err;
535}
536
537static inline int put_compat_shminfo64(struct shminfo64 *smi,
538                       struct compat_shminfo64 __user *up64)
539{
540    int err;
541
542    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
543        return -EFAULT;
544    if (smi->shmmax > INT_MAX)
545        smi->shmmax = INT_MAX;
546    err = __put_user(smi->shmmax, &up64->shmmax);
547    err |= __put_user(smi->shmmin, &up64->shmmin);
548    err |= __put_user(smi->shmmni, &up64->shmmni);
549    err |= __put_user(smi->shmseg, &up64->shmseg);
550    err |= __put_user(smi->shmall, &up64->shmall);
551    return err;
552}
553
554static inline int put_compat_shminfo(struct shminfo64 *smi,
555                     struct shminfo __user *up)
556{
557    int err;
558
559    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
560        return -EFAULT;
561    if (smi->shmmax > INT_MAX)
562        smi->shmmax = INT_MAX;
563    err = __put_user(smi->shmmax, &up->shmmax);
564    err |= __put_user(smi->shmmin, &up->shmmin);
565    err |= __put_user(smi->shmmni, &up->shmmni);
566    err |= __put_user(smi->shmseg, &up->shmseg);
567    err |= __put_user(smi->shmall, &up->shmall);
568    return err;
569}
570
571static inline int put_compat_shm_info(struct shm_info __user *ip,
572                      struct compat_shm_info __user *uip)
573{
574    int err;
575    struct shm_info si;
576
577    if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
578        copy_from_user(&si, ip, sizeof(si)))
579        return -EFAULT;
580    err = __put_user(si.used_ids, &uip->used_ids);
581    err |= __put_user(si.shm_tot, &uip->shm_tot);
582    err |= __put_user(si.shm_rss, &uip->shm_rss);
583    err |= __put_user(si.shm_swp, &uip->shm_swp);
584    err |= __put_user(si.swap_attempts, &uip->swap_attempts);
585    err |= __put_user(si.swap_successes, &uip->swap_successes);
586    return err;
587}
588
589long compat_sys_shmctl(int first, int second, void __user *uptr)
590{
591    void __user *p;
592    struct shmid64_ds s64;
593    struct shminfo64 smi;
594    int err, err2;
595    int version = compat_ipc_parse_version(&second);
596
597    switch (second & (~IPC_64)) {
598    case IPC_RMID:
599    case SHM_LOCK:
600    case SHM_UNLOCK:
601        err = sys_shmctl(first, second, uptr);
602        break;
603
604    case IPC_INFO:
605        p = compat_alloc_user_space(sizeof(smi));
606        err = sys_shmctl(first, second, p);
607        if (err < 0)
608            break;
609        if (copy_from_user(&smi, p, sizeof(smi)))
610            err2 = -EFAULT;
611        else if (version == IPC_64)
612            err2 = put_compat_shminfo64(&smi, uptr);
613        else
614            err2 = put_compat_shminfo(&smi, uptr);
615        if (err2)
616            err = -EFAULT;
617        break;
618
619
620    case IPC_SET:
621        if (version == IPC_64) {
622            err = get_compat_shmid64_ds(&s64, uptr);
623        } else {
624            err = get_compat_shmid_ds(&s64, uptr);
625        }
626        if (err)
627            break;
628        p = compat_alloc_user_space(sizeof(s64));
629        if (copy_to_user(p, &s64, sizeof(s64)))
630            err = -EFAULT;
631        else
632            err = sys_shmctl(first, second, p);
633        break;
634
635    case IPC_STAT:
636    case SHM_STAT:
637        p = compat_alloc_user_space(sizeof(s64));
638        err = sys_shmctl(first, second, p);
639        if (err < 0)
640            break;
641        if (copy_from_user(&s64, p, sizeof(s64)))
642            err2 = -EFAULT;
643        else if (version == IPC_64)
644            err2 = put_compat_shmid64_ds(&s64, uptr);
645        else
646            err2 = put_compat_shmid_ds(&s64, uptr);
647        if (err2)
648            err = -EFAULT;
649        break;
650
651    case SHM_INFO:
652        p = compat_alloc_user_space(sizeof(struct shm_info));
653        err = sys_shmctl(first, second, p);
654        if (err < 0)
655            break;
656        err2 = put_compat_shm_info(p, uptr);
657        if (err2)
658            err = -EFAULT;
659        break;
660
661    default:
662        err = -EINVAL;
663        break;
664    }
665    return err;
666}
667
668long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
669        unsigned nsops, const struct compat_timespec __user *timeout)
670{
671    struct timespec __user *ts64 = NULL;
672    if (timeout) {
673        struct timespec ts;
674        ts64 = compat_alloc_user_space(sizeof(*ts64));
675        if (get_compat_timespec(&ts, timeout))
676            return -EFAULT;
677        if (copy_to_user(ts64, &ts, sizeof(ts)))
678            return -EFAULT;
679    }
680    return sys_semtimedop(semid, tsems, nsops, ts64);
681}
682

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