Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/ipc/compat.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 2 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 2 months ago) by niro
File MIME type: text/plain
File size: 17697 byte(s)
Tag kernel26-2.6.12-alx-r9
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/config.h> |
25 | #include <linux/errno.h> |
26 | #include <linux/highuid.h> |
27 | #include <linux/init.h> |
28 | #include <linux/msg.h> |
29 | #include <linux/shm.h> |
30 | #include <linux/slab.h> |
31 | #include <linux/syscalls.h> |
32 | |
33 | #include <asm/semaphore.h> |
34 | #include <asm/uaccess.h> |
35 | |
36 | #include "util.h" |
37 | |
38 | struct compat_msgbuf { |
39 | compat_long_t mtype; |
40 | char mtext[1]; |
41 | }; |
42 | |
43 | struct compat_ipc_perm { |
44 | key_t key; |
45 | compat_uid_t uid; |
46 | compat_gid_t gid; |
47 | compat_uid_t cuid; |
48 | compat_gid_t cgid; |
49 | compat_mode_t mode; |
50 | unsigned short seq; |
51 | }; |
52 | |
53 | struct compat_semid_ds { |
54 | struct compat_ipc_perm sem_perm; |
55 | compat_time_t sem_otime; |
56 | compat_time_t sem_ctime; |
57 | compat_uptr_t sem_base; |
58 | compat_uptr_t sem_pending; |
59 | compat_uptr_t sem_pending_last; |
60 | compat_uptr_t undo; |
61 | unsigned short sem_nsems; |
62 | }; |
63 | |
64 | struct compat_msqid_ds { |
65 | struct compat_ipc_perm msg_perm; |
66 | compat_uptr_t msg_first; |
67 | compat_uptr_t msg_last; |
68 | compat_time_t msg_stime; |
69 | compat_time_t msg_rtime; |
70 | compat_time_t msg_ctime; |
71 | compat_ulong_t msg_lcbytes; |
72 | compat_ulong_t msg_lqbytes; |
73 | unsigned short msg_cbytes; |
74 | unsigned short msg_qnum; |
75 | unsigned short msg_qbytes; |
76 | compat_ipc_pid_t msg_lspid; |
77 | compat_ipc_pid_t msg_lrpid; |
78 | }; |
79 | |
80 | struct compat_shmid_ds { |
81 | struct compat_ipc_perm shm_perm; |
82 | int shm_segsz; |
83 | compat_time_t shm_atime; |
84 | compat_time_t shm_dtime; |
85 | compat_time_t shm_ctime; |
86 | compat_ipc_pid_t shm_cpid; |
87 | compat_ipc_pid_t shm_lpid; |
88 | unsigned short shm_nattch; |
89 | unsigned short shm_unused; |
90 | compat_uptr_t shm_unused2; |
91 | compat_uptr_t shm_unused3; |
92 | }; |
93 | |
94 | struct compat_ipc_kludge { |
95 | compat_uptr_t msgp; |
96 | compat_long_t msgtyp; |
97 | }; |
98 | |
99 | struct compat_shminfo64 { |
100 | compat_ulong_t shmmax; |
101 | compat_ulong_t shmmin; |
102 | compat_ulong_t shmmni; |
103 | compat_ulong_t shmseg; |
104 | compat_ulong_t shmall; |
105 | compat_ulong_t __unused1; |
106 | compat_ulong_t __unused2; |
107 | compat_ulong_t __unused3; |
108 | compat_ulong_t __unused4; |
109 | }; |
110 | |
111 | struct compat_shm_info { |
112 | compat_int_t used_ids; |
113 | compat_ulong_t shm_tot, shm_rss, shm_swp; |
114 | compat_ulong_t swap_attempts, swap_successes; |
115 | }; |
116 | |
117 | extern int sem_ctls[]; |
118 | #define sc_semopm (sem_ctls[2]) |
119 | #define MAXBUF (64*1024) |
120 | |
121 | static inline int compat_ipc_parse_version(int *cmd) |
122 | { |
123 | int version = *cmd & IPC_64; |
124 | |
125 | /* this is tricky: architectures that have support for the old |
126 | * ipc structures in 64 bit binaries need to have IPC_64 set |
127 | * in cmd, the others need to have it cleared */ |
128 | #ifndef ipc_parse_version |
129 | *cmd |= IPC_64; |
130 | #else |
131 | *cmd &= ~IPC_64; |
132 | #endif |
133 | return version; |
134 | } |
135 | |
136 | static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64, |
137 | struct compat_ipc64_perm __user *up64) |
138 | { |
139 | int err; |
140 | |
141 | err = __get_user(p64->uid, &up64->uid); |
142 | err |= __get_user(p64->gid, &up64->gid); |
143 | err |= __get_user(p64->mode, &up64->mode); |
144 | return err; |
145 | } |
146 | |
147 | static inline int __get_compat_ipc_perm(struct ipc64_perm *p, |
148 | struct compat_ipc_perm __user *up) |
149 | { |
150 | int err; |
151 | |
152 | err = __get_user(p->uid, &up->uid); |
153 | err |= __get_user(p->gid, &up->gid); |
154 | err |= __get_user(p->mode, &up->mode); |
155 | return err; |
156 | } |
157 | |
158 | static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64, |
159 | struct compat_ipc64_perm __user *up64) |
160 | { |
161 | int err; |
162 | |
163 | err = __put_user(p64->key, &up64->key); |
164 | err |= __put_user(p64->uid, &up64->uid); |
165 | err |= __put_user(p64->gid, &up64->gid); |
166 | err |= __put_user(p64->cuid, &up64->cuid); |
167 | err |= __put_user(p64->cgid, &up64->cgid); |
168 | err |= __put_user(p64->mode, &up64->mode); |
169 | err |= __put_user(p64->seq, &up64->seq); |
170 | return err; |
171 | } |
172 | |
173 | static inline int __put_compat_ipc_perm(struct ipc64_perm *p, |
174 | struct compat_ipc_perm __user *up) |
175 | { |
176 | int err; |
177 | compat_uid_t u; |
178 | compat_gid_t g; |
179 | |
180 | err = __put_user(p->key, &up->key); |
181 | SET_UID(u, p->uid); |
182 | err |= __put_user(u, &up->uid); |
183 | SET_GID(g, p->gid); |
184 | err |= __put_user(g, &up->gid); |
185 | SET_UID(u, p->cuid); |
186 | err |= __put_user(u, &up->cuid); |
187 | SET_GID(g, p->cgid); |
188 | err |= __put_user(g, &up->cgid); |
189 | err |= __put_user(p->mode, &up->mode); |
190 | err |= __put_user(p->seq, &up->seq); |
191 | return err; |
192 | } |
193 | |
194 | static inline int get_compat_semid64_ds(struct semid64_ds *s64, |
195 | struct compat_semid64_ds __user *up64) |
196 | { |
197 | if (!access_ok (VERIFY_READ, up64, sizeof(*up64))) |
198 | return -EFAULT; |
199 | return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm); |
200 | } |
201 | |
202 | static inline int get_compat_semid_ds(struct semid64_ds *s, |
203 | struct compat_semid_ds __user *up) |
204 | { |
205 | if (!access_ok (VERIFY_READ, up, sizeof(*up))) |
206 | return -EFAULT; |
207 | return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm); |
208 | } |
209 | |
210 | static inline int put_compat_semid64_ds(struct semid64_ds *s64, |
211 | struct compat_semid64_ds __user *up64) |
212 | { |
213 | int err; |
214 | |
215 | if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64))) |
216 | return -EFAULT; |
217 | err = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm); |
218 | err |= __put_user(s64->sem_otime, &up64->sem_otime); |
219 | err |= __put_user(s64->sem_ctime, &up64->sem_ctime); |
220 | err |= __put_user(s64->sem_nsems, &up64->sem_nsems); |
221 | return err; |
222 | } |
223 | |
224 | static inline int put_compat_semid_ds(struct semid64_ds *s, |
225 | struct compat_semid_ds __user *up) |
226 | { |
227 | int err; |
228 | |
229 | if (!access_ok (VERIFY_WRITE, up, sizeof(*up))) |
230 | err = -EFAULT; |
231 | err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm); |
232 | err |= __put_user(s->sem_otime, &up->sem_otime); |
233 | err |= __put_user(s->sem_ctime, &up->sem_ctime); |
234 | err |= __put_user(s->sem_nsems, &up->sem_nsems); |
235 | return err; |
236 | } |
237 | |
238 | long compat_sys_semctl(int first, int second, int third, void __user *uptr) |
239 | { |
240 | union semun fourth; |
241 | u32 pad; |
242 | int err, err2; |
243 | struct semid64_ds s64; |
244 | struct semid64_ds __user *up64; |
245 | int version = compat_ipc_parse_version(&third); |
246 | |
247 | if (!uptr) |
248 | return -EINVAL; |
249 | if (get_user(pad, (u32 __user *) uptr)) |
250 | return -EFAULT; |
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 | long compat_sys_msgsnd(int first, int second, int third, void __user *uptr) |
310 | { |
311 | struct msgbuf __user *p; |
312 | struct compat_msgbuf __user *up = uptr; |
313 | long type; |
314 | |
315 | if (first < 0) |
316 | return -EINVAL; |
317 | if (second < 0 || (second >= MAXBUF - sizeof(struct msgbuf))) |
318 | return -EINVAL; |
319 | |
320 | p = compat_alloc_user_space(second + sizeof(struct msgbuf)); |
321 | if (get_user(type, &up->mtype) || |
322 | put_user(type, &p->mtype) || |
323 | copy_in_user(p->mtext, up->mtext, second)) |
324 | return -EFAULT; |
325 | |
326 | return sys_msgsnd(first, p, second, third); |
327 | } |
328 | |
329 | long compat_sys_msgrcv(int first, int second, int msgtyp, int third, |
330 | int version, void __user *uptr) |
331 | { |
332 | struct msgbuf __user *p; |
333 | struct compat_msgbuf __user *up; |
334 | long type; |
335 | int err; |
336 | |
337 | if (first < 0) |
338 | return -EINVAL; |
339 | if (second < 0 || (second >= MAXBUF - sizeof(struct msgbuf))) |
340 | return -EINVAL; |
341 | |
342 | if (!version) { |
343 | struct compat_ipc_kludge ipck; |
344 | err = -EINVAL; |
345 | if (!uptr) |
346 | goto out; |
347 | err = -EFAULT; |
348 | if (copy_from_user (&ipck, uptr, sizeof(ipck))) |
349 | goto out; |
350 | uptr = compat_ptr(ipck.msgp); |
351 | msgtyp = ipck.msgtyp; |
352 | } |
353 | p = compat_alloc_user_space(second + sizeof(struct msgbuf)); |
354 | err = sys_msgrcv(first, p, second, msgtyp, third); |
355 | if (err < 0) |
356 | goto out; |
357 | up = uptr; |
358 | if (get_user(type, &p->mtype) || |
359 | put_user(type, &up->mtype) || |
360 | copy_in_user(up->mtext, p->mtext, err)) |
361 | err = -EFAULT; |
362 | out: |
363 | return err; |
364 | } |
365 | |
366 | static inline int get_compat_msqid64(struct msqid64_ds *m64, |
367 | struct compat_msqid64_ds __user *up64) |
368 | { |
369 | int err; |
370 | |
371 | if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) |
372 | return -EFAULT; |
373 | err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm); |
374 | err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes); |
375 | return err; |
376 | } |
377 | |
378 | static inline int get_compat_msqid(struct msqid64_ds *m, |
379 | struct compat_msqid_ds __user *up) |
380 | { |
381 | int err; |
382 | |
383 | if (!access_ok(VERIFY_READ, up, sizeof(*up))) |
384 | return -EFAULT; |
385 | err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm); |
386 | err |= __get_user(m->msg_qbytes, &up->msg_qbytes); |
387 | return err; |
388 | } |
389 | |
390 | static inline int put_compat_msqid64_ds(struct msqid64_ds *m64, |
391 | struct compat_msqid64_ds __user *up64) |
392 | { |
393 | int err; |
394 | |
395 | if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) |
396 | return -EFAULT; |
397 | err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm); |
398 | err |= __put_user(m64->msg_stime, &up64->msg_stime); |
399 | err |= __put_user(m64->msg_rtime, &up64->msg_rtime); |
400 | err |= __put_user(m64->msg_ctime, &up64->msg_ctime); |
401 | err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes); |
402 | err |= __put_user(m64->msg_qnum, &up64->msg_qnum); |
403 | err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes); |
404 | err |= __put_user(m64->msg_lspid, &up64->msg_lspid); |
405 | err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid); |
406 | return err; |
407 | } |
408 | |
409 | static inline int put_compat_msqid_ds(struct msqid64_ds *m, |
410 | struct compat_msqid_ds __user *up) |
411 | { |
412 | int err; |
413 | |
414 | if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) |
415 | return -EFAULT; |
416 | err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm); |
417 | err |= __put_user(m->msg_stime, &up->msg_stime); |
418 | err |= __put_user(m->msg_rtime, &up->msg_rtime); |
419 | err |= __put_user(m->msg_ctime, &up->msg_ctime); |
420 | err |= __put_user(m->msg_cbytes, &up->msg_cbytes); |
421 | err |= __put_user(m->msg_qnum, &up->msg_qnum); |
422 | err |= __put_user(m->msg_qbytes, &up->msg_qbytes); |
423 | err |= __put_user(m->msg_lspid, &up->msg_lspid); |
424 | err |= __put_user(m->msg_lrpid, &up->msg_lrpid); |
425 | return err; |
426 | } |
427 | |
428 | long compat_sys_msgctl(int first, int second, void __user *uptr) |
429 | { |
430 | int err, err2; |
431 | struct msqid64_ds m64; |
432 | int version = compat_ipc_parse_version(&second); |
433 | void __user *p; |
434 | |
435 | switch (second & (~IPC_64)) { |
436 | case IPC_INFO: |
437 | case IPC_RMID: |
438 | case MSG_INFO: |
439 | err = sys_msgctl(first, second, uptr); |
440 | break; |
441 | |
442 | case IPC_SET: |
443 | if (version == IPC_64) { |
444 | err = get_compat_msqid64(&m64, uptr); |
445 | } else { |
446 | err = get_compat_msqid(&m64, uptr); |
447 | } |
448 | if (err) |
449 | break; |
450 | p = compat_alloc_user_space(sizeof(m64)); |
451 | if (copy_to_user(p, &m64, sizeof(m64))) |
452 | err = -EFAULT; |
453 | else |
454 | err = sys_msgctl(first, second, p); |
455 | break; |
456 | |
457 | case IPC_STAT: |
458 | case MSG_STAT: |
459 | p = compat_alloc_user_space(sizeof(m64)); |
460 | err = sys_msgctl(first, second, p); |
461 | if (err < 0) |
462 | break; |
463 | if (copy_from_user(&m64, p, sizeof(m64))) |
464 | err2 = -EFAULT; |
465 | else if (version == IPC_64) |
466 | err2 = put_compat_msqid64_ds(&m64, uptr); |
467 | else |
468 | err2 = put_compat_msqid_ds(&m64, uptr); |
469 | if (err2) |
470 | err = -EFAULT; |
471 | break; |
472 | |
473 | default: |
474 | err = -EINVAL; |
475 | break; |
476 | } |
477 | return err; |
478 | } |
479 | |
480 | long compat_sys_shmat(int first, int second, compat_uptr_t third, int version, |
481 | void __user *uptr) |
482 | { |
483 | int err; |
484 | unsigned long raddr; |
485 | compat_ulong_t __user *uaddr; |
486 | |
487 | if (version == 1) |
488 | return -EINVAL; |
489 | err = do_shmat(first, uptr, second, &raddr); |
490 | if (err < 0) |
491 | return err; |
492 | uaddr = compat_ptr(third); |
493 | return put_user(raddr, uaddr); |
494 | } |
495 | |
496 | static inline int get_compat_shmid64_ds(struct shmid64_ds *s64, |
497 | struct compat_shmid64_ds __user *up64) |
498 | { |
499 | if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) |
500 | return -EFAULT; |
501 | return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm); |
502 | } |
503 | |
504 | static inline int get_compat_shmid_ds(struct shmid64_ds *s, |
505 | struct compat_shmid_ds __user *up) |
506 | { |
507 | if (!access_ok(VERIFY_READ, up, sizeof(*up))) |
508 | return -EFAULT; |
509 | return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm); |
510 | } |
511 | |
512 | static inline int put_compat_shmid64_ds(struct shmid64_ds *s64, |
513 | struct compat_shmid64_ds __user *up64) |
514 | { |
515 | int err; |
516 | |
517 | if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) |
518 | return -EFAULT; |
519 | err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm); |
520 | err |= __put_user(s64->shm_atime, &up64->shm_atime); |
521 | err |= __put_user(s64->shm_dtime, &up64->shm_dtime); |
522 | err |= __put_user(s64->shm_ctime, &up64->shm_ctime); |
523 | err |= __put_user(s64->shm_segsz, &up64->shm_segsz); |
524 | err |= __put_user(s64->shm_nattch, &up64->shm_nattch); |
525 | err |= __put_user(s64->shm_cpid, &up64->shm_cpid); |
526 | err |= __put_user(s64->shm_lpid, &up64->shm_lpid); |
527 | return err; |
528 | } |
529 | |
530 | static inline int put_compat_shmid_ds(struct shmid64_ds *s, |
531 | struct compat_shmid_ds __user *up) |
532 | { |
533 | int err; |
534 | |
535 | if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) |
536 | return -EFAULT; |
537 | err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm); |
538 | err |= __put_user(s->shm_atime, &up->shm_atime); |
539 | err |= __put_user(s->shm_dtime, &up->shm_dtime); |
540 | err |= __put_user(s->shm_ctime, &up->shm_ctime); |
541 | err |= __put_user(s->shm_segsz, &up->shm_segsz); |
542 | err |= __put_user(s->shm_nattch, &up->shm_nattch); |
543 | err |= __put_user(s->shm_cpid, &up->shm_cpid); |
544 | err |= __put_user(s->shm_lpid, &up->shm_lpid); |
545 | return err; |
546 | } |
547 | |
548 | static inline int put_compat_shminfo64(struct shminfo64 *smi, |
549 | struct compat_shminfo64 __user *up64) |
550 | { |
551 | int err; |
552 | |
553 | if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) |
554 | return -EFAULT; |
555 | err = __put_user(smi->shmmax, &up64->shmmax); |
556 | err |= __put_user(smi->shmmin, &up64->shmmin); |
557 | err |= __put_user(smi->shmmni, &up64->shmmni); |
558 | err |= __put_user(smi->shmseg, &up64->shmseg); |
559 | err |= __put_user(smi->shmall, &up64->shmall); |
560 | return err; |
561 | } |
562 | |
563 | static inline int put_compat_shminfo(struct shminfo64 *smi, |
564 | struct shminfo __user *up) |
565 | { |
566 | int err; |
567 | |
568 | if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) |
569 | return -EFAULT; |
570 | err = __put_user(smi->shmmax, &up->shmmax); |
571 | err |= __put_user(smi->shmmin, &up->shmmin); |
572 | err |= __put_user(smi->shmmni, &up->shmmni); |
573 | err |= __put_user(smi->shmseg, &up->shmseg); |
574 | err |= __put_user(smi->shmall, &up->shmall); |
575 | } |
576 | |
577 | static inline int put_compat_shm_info(struct shm_info __user *ip, |
578 | struct compat_shm_info __user *uip) |
579 | { |
580 | int err; |
581 | struct shm_info si; |
582 | |
583 | if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) || |
584 | copy_from_user(&si, ip, sizeof(si))) |
585 | return -EFAULT; |
586 | err = __put_user(si.used_ids, &uip->used_ids); |
587 | err |= __put_user(si.shm_tot, &uip->shm_tot); |
588 | err |= __put_user(si.shm_rss, &uip->shm_rss); |
589 | err |= __put_user(si.shm_swp, &uip->shm_swp); |
590 | err |= __put_user(si.swap_attempts, &uip->swap_attempts); |
591 | err |= __put_user(si.swap_successes, &uip->swap_successes); |
592 | return err; |
593 | } |
594 | |
595 | long compat_sys_shmctl(int first, int second, void __user *uptr) |
596 | { |
597 | void __user *p; |
598 | struct shmid64_ds s64; |
599 | struct shminfo64 smi; |
600 | int err, err2; |
601 | int version = compat_ipc_parse_version(&second); |
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 | |
674 | long 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 | } |