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
37 struct compat_msgbuf {
38 compat_long_t mtype;
39 char mtext[1];
40 };
41
42 struct 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
52 struct 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
63 struct 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
79 struct 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
93 struct compat_ipc_kludge {
94 compat_uptr_t msgp;
95 compat_long_t msgtyp;
96 };
97
98 struct 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
110 struct 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
116 extern int sem_ctls[];
117 #define sc_semopm (sem_ctls[2])
118
compat_ipc_parse_version(int * cmd)119 static 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
__get_compat_ipc64_perm(struct ipc64_perm * p64,struct compat_ipc64_perm __user * up64)139 static 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
__get_compat_ipc_perm(struct ipc64_perm * p,struct compat_ipc_perm __user * up)150 static 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
__put_compat_ipc64_perm(struct ipc64_perm * p64,struct compat_ipc64_perm __user * up64)161 static 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
__put_compat_ipc_perm(struct ipc64_perm * p,struct compat_ipc_perm __user * up)176 static 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
get_compat_semid64_ds(struct semid64_ds * s64,struct compat_semid64_ds __user * up64)197 static 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
get_compat_semid_ds(struct semid64_ds * s,struct compat_semid_ds __user * up)205 static 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
put_compat_semid64_ds(struct semid64_ds * s64,struct compat_semid64_ds __user * up64)213 static 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
put_compat_semid_ds(struct semid64_ds * s,struct compat_semid_ds __user * up)227 static 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
do_compat_semctl(int first,int second,int third,u32 pad)241 static long do_compat_semctl(int first, int second, int third, u32 pad)
242 {
243 unsigned long 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 #ifdef __BIG_ENDIAN
253 fourth = (unsigned long)pad << 32;
254 #else
255 fourth = pad;
256 #endif
257 else
258 fourth = (unsigned long)compat_ptr(pad);
259 switch (third & (~IPC_64)) {
260 case IPC_INFO:
261 case IPC_RMID:
262 case SEM_INFO:
263 case GETVAL:
264 case GETPID:
265 case GETNCNT:
266 case GETZCNT:
267 case GETALL:
268 case SETVAL:
269 case SETALL:
270 err = sys_semctl(first, second, third, fourth);
271 break;
272
273 case IPC_STAT:
274 case SEM_STAT:
275 up64 = compat_alloc_user_space(sizeof(s64));
276 fourth = (unsigned long)up64;
277 err = sys_semctl(first, second, third, fourth);
278 if (err < 0)
279 break;
280 if (copy_from_user(&s64, up64, sizeof(s64)))
281 err2 = -EFAULT;
282 else if (version == IPC_64)
283 err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
284 else
285 err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
286 if (err2)
287 err = -EFAULT;
288 break;
289
290 case IPC_SET:
291 if (version == IPC_64) {
292 err = get_compat_semid64_ds(&s64, compat_ptr(pad));
293 } else {
294 err = get_compat_semid_ds(&s64, compat_ptr(pad));
295 }
296 up64 = compat_alloc_user_space(sizeof(s64));
297 if (copy_to_user(up64, &s64, sizeof(s64)))
298 err = -EFAULT;
299 if (err)
300 break;
301
302 fourth = (unsigned long)up64;
303 err = sys_semctl(first, second, third, fourth);
304 break;
305
306 default:
307 err = -EINVAL;
308 break;
309 }
310 return err;
311 }
312
compat_do_msg_fill(void __user * dest,struct msg_msg * msg,size_t bufsz)313 static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
314 {
315 struct compat_msgbuf __user *msgp = dest;
316 size_t msgsz;
317
318 if (put_user(msg->m_type, &msgp->mtype))
319 return -EFAULT;
320
321 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
322 if (store_msg(msgp->mtext, msg, msgsz))
323 return -EFAULT;
324 return msgsz;
325 }
326
327 #ifndef COMPAT_SHMLBA
328 #define COMPAT_SHMLBA SHMLBA
329 #endif
330
331 #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
COMPAT_SYSCALL_DEFINE6(ipc,u32,call,int,first,int,second,u32,third,compat_uptr_t,ptr,u32,fifth)332 COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
333 u32, third, compat_uptr_t, ptr, u32, fifth)
334 {
335 int version;
336 u32 pad;
337
338 version = call >> 16; /* hack for backward compatibility */
339 call &= 0xffff;
340
341 switch (call) {
342 case SEMOP:
343 /* struct sembuf is the same on 32 and 64bit :)) */
344 return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
345 case SEMTIMEDOP:
346 return compat_sys_semtimedop(first, compat_ptr(ptr), second,
347 compat_ptr(fifth));
348 case SEMGET:
349 return sys_semget(first, second, third);
350 case SEMCTL:
351 if (!ptr)
352 return -EINVAL;
353 if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
354 return -EFAULT;
355 return do_compat_semctl(first, second, third, pad);
356
357 case MSGSND: {
358 struct compat_msgbuf __user *up = compat_ptr(ptr);
359 compat_long_t type;
360
361 if (first < 0 || second < 0)
362 return -EINVAL;
363
364 if (get_user(type, &up->mtype))
365 return -EFAULT;
366
367 return do_msgsnd(first, type, up->mtext, second, third);
368 }
369 case MSGRCV: {
370 void __user *uptr = compat_ptr(ptr);
371
372 if (first < 0 || second < 0)
373 return -EINVAL;
374
375 if (!version) {
376 struct compat_ipc_kludge ipck;
377 if (!uptr)
378 return -EINVAL;
379 if (copy_from_user (&ipck, uptr, sizeof(ipck)))
380 return -EFAULT;
381 uptr = compat_ptr(ipck.msgp);
382 fifth = ipck.msgtyp;
383 }
384 return do_msgrcv(first, uptr, second, fifth, third,
385 compat_do_msg_fill);
386 }
387 case MSGGET:
388 return sys_msgget(first, second);
389 case MSGCTL:
390 return compat_sys_msgctl(first, second, compat_ptr(ptr));
391
392 case SHMAT: {
393 int err;
394 unsigned long raddr;
395
396 if (version == 1)
397 return -EINVAL;
398 err = do_shmat(first, compat_ptr(ptr), second, &raddr,
399 COMPAT_SHMLBA);
400 if (err < 0)
401 return err;
402 return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
403 }
404 case SHMDT:
405 return sys_shmdt(compat_ptr(ptr));
406 case SHMGET:
407 return sys_shmget(first, (unsigned)second, third);
408 case SHMCTL:
409 return compat_sys_shmctl(first, second, compat_ptr(ptr));
410 }
411
412 return -ENOSYS;
413 }
414 #endif
415
COMPAT_SYSCALL_DEFINE4(semctl,int,semid,int,semnum,int,cmd,int,arg)416 COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
417 {
418 return do_compat_semctl(semid, semnum, cmd, arg);
419 }
420
COMPAT_SYSCALL_DEFINE4(msgsnd,int,msqid,compat_uptr_t,msgp,compat_ssize_t,msgsz,int,msgflg)421 COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
422 compat_ssize_t, msgsz, int, msgflg)
423 {
424 struct compat_msgbuf __user *up = compat_ptr(msgp);
425 compat_long_t mtype;
426
427 if (get_user(mtype, &up->mtype))
428 return -EFAULT;
429 return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
430 }
431
COMPAT_SYSCALL_DEFINE5(msgrcv,int,msqid,compat_uptr_t,msgp,compat_ssize_t,msgsz,long,msgtyp,int,msgflg)432 COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
433 compat_ssize_t, msgsz, long, msgtyp, int, msgflg)
434 {
435 return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, msgtyp,
436 msgflg, compat_do_msg_fill);
437 }
438
get_compat_msqid64(struct msqid64_ds * m64,struct compat_msqid64_ds __user * up64)439 static inline int get_compat_msqid64(struct msqid64_ds *m64,
440 struct compat_msqid64_ds __user *up64)
441 {
442 int err;
443
444 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
445 return -EFAULT;
446 err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
447 err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
448 return err;
449 }
450
get_compat_msqid(struct msqid64_ds * m,struct compat_msqid_ds __user * up)451 static inline int get_compat_msqid(struct msqid64_ds *m,
452 struct compat_msqid_ds __user *up)
453 {
454 int err;
455
456 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
457 return -EFAULT;
458 err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
459 err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
460 return err;
461 }
462
put_compat_msqid64_ds(struct msqid64_ds * m64,struct compat_msqid64_ds __user * up64)463 static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
464 struct compat_msqid64_ds __user *up64)
465 {
466 int err;
467
468 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
469 return -EFAULT;
470 err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
471 err |= __put_user(m64->msg_stime, &up64->msg_stime);
472 err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
473 err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
474 err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
475 err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
476 err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
477 err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
478 err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
479 return err;
480 }
481
put_compat_msqid_ds(struct msqid64_ds * m,struct compat_msqid_ds __user * up)482 static inline int put_compat_msqid_ds(struct msqid64_ds *m,
483 struct compat_msqid_ds __user *up)
484 {
485 int err;
486
487 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
488 return -EFAULT;
489 err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
490 err |= __put_user(m->msg_stime, &up->msg_stime);
491 err |= __put_user(m->msg_rtime, &up->msg_rtime);
492 err |= __put_user(m->msg_ctime, &up->msg_ctime);
493 err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
494 err |= __put_user(m->msg_qnum, &up->msg_qnum);
495 err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
496 err |= __put_user(m->msg_lspid, &up->msg_lspid);
497 err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
498 return err;
499 }
500
compat_sys_msgctl(int first,int second,void __user * uptr)501 long compat_sys_msgctl(int first, int second, void __user *uptr)
502 {
503 int err, err2;
504 struct msqid64_ds m64;
505 int version = compat_ipc_parse_version(&second);
506 void __user *p;
507
508 memset(&m64, 0, sizeof(m64));
509
510 switch (second & (~IPC_64)) {
511 case IPC_INFO:
512 case IPC_RMID:
513 case MSG_INFO:
514 err = sys_msgctl(first, second, uptr);
515 break;
516
517 case IPC_SET:
518 if (version == IPC_64) {
519 err = get_compat_msqid64(&m64, uptr);
520 } else {
521 err = get_compat_msqid(&m64, uptr);
522 }
523 if (err)
524 break;
525 p = compat_alloc_user_space(sizeof(m64));
526 if (copy_to_user(p, &m64, sizeof(m64)))
527 err = -EFAULT;
528 else
529 err = sys_msgctl(first, second, p);
530 break;
531
532 case IPC_STAT:
533 case MSG_STAT:
534 p = compat_alloc_user_space(sizeof(m64));
535 err = sys_msgctl(first, second, p);
536 if (err < 0)
537 break;
538 if (copy_from_user(&m64, p, sizeof(m64)))
539 err2 = -EFAULT;
540 else if (version == IPC_64)
541 err2 = put_compat_msqid64_ds(&m64, uptr);
542 else
543 err2 = put_compat_msqid_ds(&m64, uptr);
544 if (err2)
545 err = -EFAULT;
546 break;
547
548 default:
549 err = -EINVAL;
550 break;
551 }
552 return err;
553 }
554
COMPAT_SYSCALL_DEFINE3(shmat,int,shmid,compat_uptr_t,shmaddr,int,shmflg)555 COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
556 {
557 unsigned long ret;
558 long err;
559
560 err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
561 if (err)
562 return err;
563 force_successful_syscall_return();
564 return (long)ret;
565 }
566
get_compat_shmid64_ds(struct shmid64_ds * s64,struct compat_shmid64_ds __user * up64)567 static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
568 struct compat_shmid64_ds __user *up64)
569 {
570 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
571 return -EFAULT;
572 return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
573 }
574
get_compat_shmid_ds(struct shmid64_ds * s,struct compat_shmid_ds __user * up)575 static inline int get_compat_shmid_ds(struct shmid64_ds *s,
576 struct compat_shmid_ds __user *up)
577 {
578 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
579 return -EFAULT;
580 return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
581 }
582
put_compat_shmid64_ds(struct shmid64_ds * s64,struct compat_shmid64_ds __user * up64)583 static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
584 struct compat_shmid64_ds __user *up64)
585 {
586 int err;
587
588 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
589 return -EFAULT;
590 err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
591 err |= __put_user(s64->shm_atime, &up64->shm_atime);
592 err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
593 err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
594 err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
595 err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
596 err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
597 err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
598 return err;
599 }
600
put_compat_shmid_ds(struct shmid64_ds * s,struct compat_shmid_ds __user * up)601 static inline int put_compat_shmid_ds(struct shmid64_ds *s,
602 struct compat_shmid_ds __user *up)
603 {
604 int err;
605
606 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
607 return -EFAULT;
608 err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
609 err |= __put_user(s->shm_atime, &up->shm_atime);
610 err |= __put_user(s->shm_dtime, &up->shm_dtime);
611 err |= __put_user(s->shm_ctime, &up->shm_ctime);
612 err |= __put_user(s->shm_segsz, &up->shm_segsz);
613 err |= __put_user(s->shm_nattch, &up->shm_nattch);
614 err |= __put_user(s->shm_cpid, &up->shm_cpid);
615 err |= __put_user(s->shm_lpid, &up->shm_lpid);
616 return err;
617 }
618
put_compat_shminfo64(struct shminfo64 * smi,struct compat_shminfo64 __user * up64)619 static inline int put_compat_shminfo64(struct shminfo64 *smi,
620 struct compat_shminfo64 __user *up64)
621 {
622 int err;
623
624 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
625 return -EFAULT;
626 if (smi->shmmax > INT_MAX)
627 smi->shmmax = INT_MAX;
628 err = __put_user(smi->shmmax, &up64->shmmax);
629 err |= __put_user(smi->shmmin, &up64->shmmin);
630 err |= __put_user(smi->shmmni, &up64->shmmni);
631 err |= __put_user(smi->shmseg, &up64->shmseg);
632 err |= __put_user(smi->shmall, &up64->shmall);
633 return err;
634 }
635
put_compat_shminfo(struct shminfo64 * smi,struct shminfo __user * up)636 static inline int put_compat_shminfo(struct shminfo64 *smi,
637 struct shminfo __user *up)
638 {
639 int err;
640
641 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
642 return -EFAULT;
643 if (smi->shmmax > INT_MAX)
644 smi->shmmax = INT_MAX;
645 err = __put_user(smi->shmmax, &up->shmmax);
646 err |= __put_user(smi->shmmin, &up->shmmin);
647 err |= __put_user(smi->shmmni, &up->shmmni);
648 err |= __put_user(smi->shmseg, &up->shmseg);
649 err |= __put_user(smi->shmall, &up->shmall);
650 return err;
651 }
652
put_compat_shm_info(struct shm_info __user * ip,struct compat_shm_info __user * uip)653 static inline int put_compat_shm_info(struct shm_info __user *ip,
654 struct compat_shm_info __user *uip)
655 {
656 int err;
657 struct shm_info si;
658
659 if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
660 copy_from_user(&si, ip, sizeof(si)))
661 return -EFAULT;
662 err = __put_user(si.used_ids, &uip->used_ids);
663 err |= __put_user(si.shm_tot, &uip->shm_tot);
664 err |= __put_user(si.shm_rss, &uip->shm_rss);
665 err |= __put_user(si.shm_swp, &uip->shm_swp);
666 err |= __put_user(si.swap_attempts, &uip->swap_attempts);
667 err |= __put_user(si.swap_successes, &uip->swap_successes);
668 return err;
669 }
670
compat_sys_shmctl(int first,int second,void __user * uptr)671 long compat_sys_shmctl(int first, int second, void __user *uptr)
672 {
673 void __user *p;
674 struct shmid64_ds s64;
675 struct shminfo64 smi;
676 int err, err2;
677 int version = compat_ipc_parse_version(&second);
678
679 memset(&s64, 0, sizeof(s64));
680
681 switch (second & (~IPC_64)) {
682 case IPC_RMID:
683 case SHM_LOCK:
684 case SHM_UNLOCK:
685 err = sys_shmctl(first, second, uptr);
686 break;
687
688 case IPC_INFO:
689 p = compat_alloc_user_space(sizeof(smi));
690 err = sys_shmctl(first, second, p);
691 if (err < 0)
692 break;
693 if (copy_from_user(&smi, p, sizeof(smi)))
694 err2 = -EFAULT;
695 else if (version == IPC_64)
696 err2 = put_compat_shminfo64(&smi, uptr);
697 else
698 err2 = put_compat_shminfo(&smi, uptr);
699 if (err2)
700 err = -EFAULT;
701 break;
702
703
704 case IPC_SET:
705 if (version == IPC_64) {
706 err = get_compat_shmid64_ds(&s64, uptr);
707 } else {
708 err = get_compat_shmid_ds(&s64, uptr);
709 }
710 if (err)
711 break;
712 p = compat_alloc_user_space(sizeof(s64));
713 if (copy_to_user(p, &s64, sizeof(s64)))
714 err = -EFAULT;
715 else
716 err = sys_shmctl(first, second, p);
717 break;
718
719 case IPC_STAT:
720 case SHM_STAT:
721 p = compat_alloc_user_space(sizeof(s64));
722 err = sys_shmctl(first, second, p);
723 if (err < 0)
724 break;
725 if (copy_from_user(&s64, p, sizeof(s64)))
726 err2 = -EFAULT;
727 else if (version == IPC_64)
728 err2 = put_compat_shmid64_ds(&s64, uptr);
729 else
730 err2 = put_compat_shmid_ds(&s64, uptr);
731 if (err2)
732 err = -EFAULT;
733 break;
734
735 case SHM_INFO:
736 p = compat_alloc_user_space(sizeof(struct shm_info));
737 err = sys_shmctl(first, second, p);
738 if (err < 0)
739 break;
740 err2 = put_compat_shm_info(p, uptr);
741 if (err2)
742 err = -EFAULT;
743 break;
744
745 default:
746 err = -EINVAL;
747 break;
748 }
749 return err;
750 }
751
compat_sys_semtimedop(int semid,struct sembuf __user * tsems,unsigned nsops,const struct compat_timespec __user * timeout)752 long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
753 unsigned nsops, const struct compat_timespec __user *timeout)
754 {
755 struct timespec __user *ts64 = NULL;
756 if (timeout) {
757 struct timespec ts;
758 ts64 = compat_alloc_user_space(sizeof(*ts64));
759 if (get_compat_timespec(&ts, timeout))
760 return -EFAULT;
761 if (copy_to_user(ts64, &ts, sizeof(ts)))
762 return -EFAULT;
763 }
764 return sys_semtimedop(semid, tsems, nsops, ts64);
765 }
766