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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 | |
119 | static inline int compat_ipc_parse_version(int *cmd) |
120 | { |
121 | #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
241 | static 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 |
310 | long 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 | |
321 | long 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 | |
337 | long 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; |
366 | out: |
367 | return err; |
368 | } |
369 | #else |
370 | long compat_sys_semctl(int semid, int semnum, int cmd, int arg) |
371 | { |
372 | return do_compat_semctl(semid, semnum, cmd, arg); |
373 | } |
374 | |
375 | long compat_sys_msgsnd(int msqid, struct compat_msgbuf __user *msgp, |
376 | size_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, msgsz, msgflg); |
383 | } |
384 | |
385 | long compat_sys_msgrcv(int msqid, struct compat_msgbuf __user *msgp, |
386 | size_t msgsz, long msgtyp, int msgflg) |
387 | { |
388 | long err, mtype; |
389 | |
390 | err = do_msgrcv(msqid, &mtype, msgp->mtext, 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 | |
401 | static 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 | |
413 | static 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 | |
425 | static 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 | |
444 | static 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 | |
463 | long 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 | #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC |
518 | long compat_sys_shmat(int first, int second, compat_uptr_t third, int version, |
519 | void __user *uptr) |
520 | { |
521 | int err; |
522 | unsigned long raddr; |
523 | compat_ulong_t __user *uaddr; |
524 | |
525 | if (version == 1) |
526 | return -EINVAL; |
527 | err = do_shmat(first, uptr, second, &raddr); |
528 | if (err < 0) |
529 | return err; |
530 | uaddr = compat_ptr(third); |
531 | return put_user(raddr, uaddr); |
532 | } |
533 | #else |
534 | long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg) |
535 | { |
536 | unsigned long ret; |
537 | long err; |
538 | |
539 | err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret); |
540 | if (err) |
541 | return err; |
542 | force_successful_syscall_return(); |
543 | return (long)ret; |
544 | } |
545 | #endif |
546 | |
547 | static inline int get_compat_shmid64_ds(struct shmid64_ds *s64, |
548 | struct compat_shmid64_ds __user *up64) |
549 | { |
550 | if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) |
551 | return -EFAULT; |
552 | return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm); |
553 | } |
554 | |
555 | static inline int get_compat_shmid_ds(struct shmid64_ds *s, |
556 | struct compat_shmid_ds __user *up) |
557 | { |
558 | if (!access_ok(VERIFY_READ, up, sizeof(*up))) |
559 | return -EFAULT; |
560 | return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm); |
561 | } |
562 | |
563 | static inline int put_compat_shmid64_ds(struct shmid64_ds *s64, |
564 | struct compat_shmid64_ds __user *up64) |
565 | { |
566 | int err; |
567 | |
568 | if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) |
569 | return -EFAULT; |
570 | err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm); |
571 | err |= __put_user(s64->shm_atime, &up64->shm_atime); |
572 | err |= __put_user(s64->shm_dtime, &up64->shm_dtime); |
573 | err |= __put_user(s64->shm_ctime, &up64->shm_ctime); |
574 | err |= __put_user(s64->shm_segsz, &up64->shm_segsz); |
575 | err |= __put_user(s64->shm_nattch, &up64->shm_nattch); |
576 | err |= __put_user(s64->shm_cpid, &up64->shm_cpid); |
577 | err |= __put_user(s64->shm_lpid, &up64->shm_lpid); |
578 | return err; |
579 | } |
580 | |
581 | static inline int put_compat_shmid_ds(struct shmid64_ds *s, |
582 | struct compat_shmid_ds __user *up) |
583 | { |
584 | int err; |
585 | |
586 | if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) |
587 | return -EFAULT; |
588 | err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm); |
589 | err |= __put_user(s->shm_atime, &up->shm_atime); |
590 | err |= __put_user(s->shm_dtime, &up->shm_dtime); |
591 | err |= __put_user(s->shm_ctime, &up->shm_ctime); |
592 | err |= __put_user(s->shm_segsz, &up->shm_segsz); |
593 | err |= __put_user(s->shm_nattch, &up->shm_nattch); |
594 | err |= __put_user(s->shm_cpid, &up->shm_cpid); |
595 | err |= __put_user(s->shm_lpid, &up->shm_lpid); |
596 | return err; |
597 | } |
598 | |
599 | static inline int put_compat_shminfo64(struct shminfo64 *smi, |
600 | struct compat_shminfo64 __user *up64) |
601 | { |
602 | int err; |
603 | |
604 | if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) |
605 | return -EFAULT; |
606 | if (smi->shmmax > INT_MAX) |
607 | smi->shmmax = INT_MAX; |
608 | err = __put_user(smi->shmmax, &up64->shmmax); |
609 | err |= __put_user(smi->shmmin, &up64->shmmin); |
610 | err |= __put_user(smi->shmmni, &up64->shmmni); |
611 | err |= __put_user(smi->shmseg, &up64->shmseg); |
612 | err |= __put_user(smi->shmall, &up64->shmall); |
613 | return err; |
614 | } |
615 | |
616 | static inline int put_compat_shminfo(struct shminfo64 *smi, |
617 | struct shminfo __user *up) |
618 | { |
619 | int err; |
620 | |
621 | if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) |
622 | return -EFAULT; |
623 | if (smi->shmmax > INT_MAX) |
624 | smi->shmmax = INT_MAX; |
625 | err = __put_user(smi->shmmax, &up->shmmax); |
626 | err |= __put_user(smi->shmmin, &up->shmmin); |
627 | err |= __put_user(smi->shmmni, &up->shmmni); |
628 | err |= __put_user(smi->shmseg, &up->shmseg); |
629 | err |= __put_user(smi->shmall, &up->shmall); |
630 | return err; |
631 | } |
632 | |
633 | static inline int put_compat_shm_info(struct shm_info __user *ip, |
634 | struct compat_shm_info __user *uip) |
635 | { |
636 | int err; |
637 | struct shm_info si; |
638 | |
639 | if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) || |
640 | copy_from_user(&si, ip, sizeof(si))) |
641 | return -EFAULT; |
642 | err = __put_user(si.used_ids, &uip->used_ids); |
643 | err |= __put_user(si.shm_tot, &uip->shm_tot); |
644 | err |= __put_user(si.shm_rss, &uip->shm_rss); |
645 | err |= __put_user(si.shm_swp, &uip->shm_swp); |
646 | err |= __put_user(si.swap_attempts, &uip->swap_attempts); |
647 | err |= __put_user(si.swap_successes, &uip->swap_successes); |
648 | return err; |
649 | } |
650 | |
651 | long compat_sys_shmctl(int first, int second, void __user *uptr) |
652 | { |
653 | void __user *p; |
654 | struct shmid64_ds s64; |
655 | struct shminfo64 smi; |
656 | int err, err2; |
657 | int version = compat_ipc_parse_version(&second); |
658 | |
659 | memset(&s64, 0, sizeof(s64)); |
660 | |
661 | switch (second & (~IPC_64)) { |
662 | case IPC_RMID: |
663 | case SHM_LOCK: |
664 | case SHM_UNLOCK: |
665 | err = sys_shmctl(first, second, uptr); |
666 | break; |
667 | |
668 | case IPC_INFO: |
669 | p = compat_alloc_user_space(sizeof(smi)); |
670 | err = sys_shmctl(first, second, p); |
671 | if (err < 0) |
672 | break; |
673 | if (copy_from_user(&smi, p, sizeof(smi))) |
674 | err2 = -EFAULT; |
675 | else if (version == IPC_64) |
676 | err2 = put_compat_shminfo64(&smi, uptr); |
677 | else |
678 | err2 = put_compat_shminfo(&smi, uptr); |
679 | if (err2) |
680 | err = -EFAULT; |
681 | break; |
682 | |
683 | |
684 | case IPC_SET: |
685 | if (version == IPC_64) { |
686 | err = get_compat_shmid64_ds(&s64, uptr); |
687 | } else { |
688 | err = get_compat_shmid_ds(&s64, uptr); |
689 | } |
690 | if (err) |
691 | break; |
692 | p = compat_alloc_user_space(sizeof(s64)); |
693 | if (copy_to_user(p, &s64, sizeof(s64))) |
694 | err = -EFAULT; |
695 | else |
696 | err = sys_shmctl(first, second, p); |
697 | break; |
698 | |
699 | case IPC_STAT: |
700 | case SHM_STAT: |
701 | p = compat_alloc_user_space(sizeof(s64)); |
702 | err = sys_shmctl(first, second, p); |
703 | if (err < 0) |
704 | break; |
705 | if (copy_from_user(&s64, p, sizeof(s64))) |
706 | err2 = -EFAULT; |
707 | else if (version == IPC_64) |
708 | err2 = put_compat_shmid64_ds(&s64, uptr); |
709 | else |
710 | err2 = put_compat_shmid_ds(&s64, uptr); |
711 | if (err2) |
712 | err = -EFAULT; |
713 | break; |
714 | |
715 | case SHM_INFO: |
716 | p = compat_alloc_user_space(sizeof(struct shm_info)); |
717 | err = sys_shmctl(first, second, p); |
718 | if (err < 0) |
719 | break; |
720 | err2 = put_compat_shm_info(p, uptr); |
721 | if (err2) |
722 | err = -EFAULT; |
723 | break; |
724 | |
725 | default: |
726 | err = -EINVAL; |
727 | break; |
728 | } |
729 | return err; |
730 | } |
731 | |
732 | long compat_sys_semtimedop(int semid, struct sembuf __user *tsems, |
733 | unsigned nsops, const struct compat_timespec __user *timeout) |
734 | { |
735 | struct timespec __user *ts64 = NULL; |
736 | if (timeout) { |
737 | struct timespec ts; |
738 | ts64 = compat_alloc_user_space(sizeof(*ts64)); |
739 | if (get_compat_timespec(&ts, timeout)) |
740 | return -EFAULT; |
741 | if (copy_to_user(ts64, &ts, sizeof(ts))) |
742 | return -EFAULT; |
743 | } |
744 | return sys_semtimedop(semid, tsems, nsops, ts64); |
745 | } |
746 |
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v2.6.34-rc5
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