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    memset(&s64, 0, sizeof(s64));
245
246    if (!uptr)
247        return -EINVAL;
248    if (get_user(pad, (u32 __user *) uptr))
249        return -EFAULT;
250    if ((third & (~IPC_64)) == SETVAL)
251        fourth.val = (int) pad;
252    else
253        fourth.__pad = compat_ptr(pad);
254    switch (third & (~IPC_64)) {
255    case IPC_INFO:
256    case IPC_RMID:
257    case SEM_INFO:
258    case GETVAL:
259    case GETPID:
260    case GETNCNT:
261    case GETZCNT:
262    case GETALL:
263    case SETVAL:
264    case SETALL:
265        err = sys_semctl(first, second, third, fourth);
266        break;
267
268    case IPC_STAT:
269    case SEM_STAT:
270        up64 = compat_alloc_user_space(sizeof(s64));
271        fourth.__pad = up64;
272        err = sys_semctl(first, second, third, fourth);
273        if (err < 0)
274            break;
275        if (copy_from_user(&s64, up64, sizeof(s64)))
276            err2 = -EFAULT;
277        else if (version == IPC_64)
278            err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
279        else
280            err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
281        if (err2)
282            err = -EFAULT;
283        break;
284
285    case IPC_SET:
286        if (version == IPC_64) {
287            err = get_compat_semid64_ds(&s64, compat_ptr(pad));
288        } else {
289            err = get_compat_semid_ds(&s64, compat_ptr(pad));
290        }
291        up64 = compat_alloc_user_space(sizeof(s64));
292        if (copy_to_user(up64, &s64, sizeof(s64)))
293            err = -EFAULT;
294        if (err)
295            break;
296
297        fourth.__pad = up64;
298        err = sys_semctl(first, second, third, fourth);
299        break;
300
301    default:
302        err = -EINVAL;
303        break;
304    }
305    return err;
306}
307
308long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
309{
310    struct compat_msgbuf __user *up = uptr;
311    long type;
312
313    if (first < 0)
314        return -EINVAL;
315    if (second < 0)
316        return -EINVAL;
317
318    if (get_user(type, &up->mtype))
319        return -EFAULT;
320
321    return do_msgsnd(first, type, up->mtext, second, third);
322}
323
324long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
325               int version, void __user *uptr)
326{
327    struct compat_msgbuf __user *up;
328    long type;
329    int err;
330
331    if (first < 0)
332        return -EINVAL;
333    if (second < 0)
334        return -EINVAL;
335
336    if (!version) {
337        struct compat_ipc_kludge ipck;
338        err = -EINVAL;
339        if (!uptr)
340            goto out;
341        err = -EFAULT;
342        if (copy_from_user (&ipck, uptr, sizeof(ipck)))
343            goto out;
344        uptr = compat_ptr(ipck.msgp);
345        msgtyp = ipck.msgtyp;
346    }
347    up = uptr;
348    err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
349    if (err < 0)
350        goto out;
351    if (put_user(type, &up->mtype))
352        err = -EFAULT;
353out:
354    return err;
355}
356
357static inline int get_compat_msqid64(struct msqid64_ds *m64,
358                     struct compat_msqid64_ds __user *up64)
359{
360    int err;
361
362    if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
363        return -EFAULT;
364    err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
365    err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
366    return err;
367}
368
369static inline int get_compat_msqid(struct msqid64_ds *m,
370                   struct compat_msqid_ds __user *up)
371{
372    int err;
373
374    if (!access_ok(VERIFY_READ, up, sizeof(*up)))
375        return -EFAULT;
376    err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
377    err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
378    return err;
379}
380
381static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
382                 struct compat_msqid64_ds __user *up64)
383{
384    int err;
385
386    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
387        return -EFAULT;
388    err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
389    err |= __put_user(m64->msg_stime, &up64->msg_stime);
390    err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
391    err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
392    err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
393    err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
394    err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
395    err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
396    err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
397    return err;
398}
399
400static inline int put_compat_msqid_ds(struct msqid64_ds *m,
401                      struct compat_msqid_ds __user *up)
402{
403    int err;
404
405    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
406        return -EFAULT;
407    err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
408    err |= __put_user(m->msg_stime, &up->msg_stime);
409    err |= __put_user(m->msg_rtime, &up->msg_rtime);
410    err |= __put_user(m->msg_ctime, &up->msg_ctime);
411    err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
412    err |= __put_user(m->msg_qnum, &up->msg_qnum);
413    err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
414    err |= __put_user(m->msg_lspid, &up->msg_lspid);
415    err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
416    return err;
417}
418
419long compat_sys_msgctl(int first, int second, void __user *uptr)
420{
421    int err, err2;
422    struct msqid64_ds m64;
423    int version = compat_ipc_parse_version(&second);
424    void __user *p;
425
426    memset(&m64, 0, sizeof(m64));
427
428    switch (second & (~IPC_64)) {
429    case IPC_INFO:
430    case IPC_RMID:
431    case MSG_INFO:
432        err = sys_msgctl(first, second, uptr);
433        break;
434
435    case IPC_SET:
436        if (version == IPC_64) {
437            err = get_compat_msqid64(&m64, uptr);
438        } else {
439            err = get_compat_msqid(&m64, uptr);
440        }
441        if (err)
442            break;
443        p = compat_alloc_user_space(sizeof(m64));
444        if (copy_to_user(p, &m64, sizeof(m64)))
445            err = -EFAULT;
446        else
447            err = sys_msgctl(first, second, p);
448        break;
449
450    case IPC_STAT:
451    case MSG_STAT:
452        p = compat_alloc_user_space(sizeof(m64));
453        err = sys_msgctl(first, second, p);
454        if (err < 0)
455            break;
456        if (copy_from_user(&m64, p, sizeof(m64)))
457            err2 = -EFAULT;
458        else if (version == IPC_64)
459            err2 = put_compat_msqid64_ds(&m64, uptr);
460        else
461            err2 = put_compat_msqid_ds(&m64, uptr);
462        if (err2)
463            err = -EFAULT;
464        break;
465
466    default:
467        err = -EINVAL;
468        break;
469    }
470    return err;
471}
472
473long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
474            void __user *uptr)
475{
476    int err;
477    unsigned long raddr;
478    compat_ulong_t __user *uaddr;
479
480    if (version == 1)
481        return -EINVAL;
482    err = do_shmat(first, uptr, second, &raddr);
483    if (err < 0)
484        return err;
485    uaddr = compat_ptr(third);
486    return put_user(raddr, uaddr);
487}
488
489static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
490                    struct compat_shmid64_ds __user *up64)
491{
492    if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
493        return -EFAULT;
494    return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
495}
496
497static inline int get_compat_shmid_ds(struct shmid64_ds *s,
498                      struct compat_shmid_ds __user *up)
499{
500    if (!access_ok(VERIFY_READ, up, sizeof(*up)))
501        return -EFAULT;
502    return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
503}
504
505static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
506                    struct compat_shmid64_ds __user *up64)
507{
508    int err;
509
510    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
511        return -EFAULT;
512    err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
513    err |= __put_user(s64->shm_atime, &up64->shm_atime);
514    err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
515    err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
516    err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
517    err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
518    err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
519    err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
520    return err;
521}
522
523static inline int put_compat_shmid_ds(struct shmid64_ds *s,
524                      struct compat_shmid_ds __user *up)
525{
526    int err;
527
528    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
529        return -EFAULT;
530    err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
531    err |= __put_user(s->shm_atime, &up->shm_atime);
532    err |= __put_user(s->shm_dtime, &up->shm_dtime);
533    err |= __put_user(s->shm_ctime, &up->shm_ctime);
534    err |= __put_user(s->shm_segsz, &up->shm_segsz);
535    err |= __put_user(s->shm_nattch, &up->shm_nattch);
536    err |= __put_user(s->shm_cpid, &up->shm_cpid);
537    err |= __put_user(s->shm_lpid, &up->shm_lpid);
538    return err;
539}
540
541static inline int put_compat_shminfo64(struct shminfo64 *smi,
542                       struct compat_shminfo64 __user *up64)
543{
544    int err;
545
546    if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
547        return -EFAULT;
548    if (smi->shmmax > INT_MAX)
549        smi->shmmax = INT_MAX;
550    err = __put_user(smi->shmmax, &up64->shmmax);
551    err |= __put_user(smi->shmmin, &up64->shmmin);
552    err |= __put_user(smi->shmmni, &up64->shmmni);
553    err |= __put_user(smi->shmseg, &up64->shmseg);
554    err |= __put_user(smi->shmall, &up64->shmall);
555    return err;
556}
557
558static inline int put_compat_shminfo(struct shminfo64 *smi,
559                     struct shminfo __user *up)
560{
561    int err;
562
563    if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
564        return -EFAULT;
565    if (smi->shmmax > INT_MAX)
566        smi->shmmax = INT_MAX;
567    err = __put_user(smi->shmmax, &up->shmmax);
568    err |= __put_user(smi->shmmin, &up->shmmin);
569    err |= __put_user(smi->shmmni, &up->shmmni);
570    err |= __put_user(smi->shmseg, &up->shmseg);
571    err |= __put_user(smi->shmall, &up->shmall);
572    return err;
573}
574
575static inline int put_compat_shm_info(struct shm_info __user *ip,
576                      struct compat_shm_info __user *uip)
577{
578    int err;
579    struct shm_info si;
580
581    if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
582        copy_from_user(&si, ip, sizeof(si)))
583        return -EFAULT;
584    err = __put_user(si.used_ids, &uip->used_ids);
585    err |= __put_user(si.shm_tot, &uip->shm_tot);
586    err |= __put_user(si.shm_rss, &uip->shm_rss);
587    err |= __put_user(si.shm_swp, &uip->shm_swp);
588    err |= __put_user(si.swap_attempts, &uip->swap_attempts);
589    err |= __put_user(si.swap_successes, &uip->swap_successes);
590    return err;
591}
592
593long compat_sys_shmctl(int first, int second, void __user *uptr)
594{
595    void __user *p;
596    struct shmid64_ds s64;
597    struct shminfo64 smi;
598    int err, err2;
599    int version = compat_ipc_parse_version(&second);
600
601    memset(&s64, 0, sizeof(s64));
602
603    switch (second & (~IPC_64)) {
604    case IPC_RMID:
605    case SHM_LOCK:
606    case SHM_UNLOCK:
607        err = sys_shmctl(first, second, uptr);
608        break;
609
610    case IPC_INFO:
611        p = compat_alloc_user_space(sizeof(smi));
612        err = sys_shmctl(first, second, p);
613        if (err < 0)
614            break;
615        if (copy_from_user(&smi, p, sizeof(smi)))
616            err2 = -EFAULT;
617        else if (version == IPC_64)
618            err2 = put_compat_shminfo64(&smi, uptr);
619        else
620            err2 = put_compat_shminfo(&smi, uptr);
621        if (err2)
622            err = -EFAULT;
623        break;
624
625
626    case IPC_SET:
627        if (version == IPC_64) {
628            err = get_compat_shmid64_ds(&s64, uptr);
629        } else {
630            err = get_compat_shmid_ds(&s64, uptr);
631        }
632        if (err)
633            break;
634        p = compat_alloc_user_space(sizeof(s64));
635        if (copy_to_user(p, &s64, sizeof(s64)))
636            err = -EFAULT;
637        else
638            err = sys_shmctl(first, second, p);
639        break;
640
641    case IPC_STAT:
642    case SHM_STAT:
643        p = compat_alloc_user_space(sizeof(s64));
644        err = sys_shmctl(first, second, p);
645        if (err < 0)
646            break;
647        if (copy_from_user(&s64, p, sizeof(s64)))
648            err2 = -EFAULT;
649        else if (version == IPC_64)
650            err2 = put_compat_shmid64_ds(&s64, uptr);
651        else
652            err2 = put_compat_shmid_ds(&s64, uptr);
653        if (err2)
654            err = -EFAULT;
655        break;
656
657    case SHM_INFO:
658        p = compat_alloc_user_space(sizeof(struct shm_info));
659        err = sys_shmctl(first, second, p);
660        if (err < 0)
661            break;
662        err2 = put_compat_shm_info(p, uptr);
663        if (err2)
664            err = -EFAULT;
665        break;
666
667    default:
668        err = -EINVAL;
669        break;
670    }
671    return err;
672}
673
674long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
675        unsigned nsops, const struct compat_timespec __user *timeout)
676{
677    struct timespec __user *ts64 = NULL;
678    if (timeout) {
679        struct timespec ts;
680        ts64 = compat_alloc_user_space(sizeof(*ts64));
681        if (get_compat_timespec(&ts, timeout))
682            return -EFAULT;
683        if (copy_to_user(ts64, &ts, sizeof(ts)))
684            return -EFAULT;
685    }
686    return sys_semtimedop(semid, tsems, nsops, ts64);
687}
688

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