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1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
1da177e4 | 29 | #include <linux/syscalls.h> |
48b25c43 | 30 | #include <linux/ptrace.h> |
1da177e4 | 31 | |
5f921ae9 | 32 | #include <linux/mutex.h> |
7153e402 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | |
35 | #include "util.h" | |
36 | ||
37 | struct compat_msgbuf { | |
38 | compat_long_t mtype; | |
39 | char mtext[1]; | |
40 | }; | |
41 | ||
1da177e4 LT |
42 | struct compat_semid_ds { |
43 | struct compat_ipc_perm sem_perm; | |
44 | compat_time_t sem_otime; | |
45 | compat_time_t sem_ctime; | |
46 | compat_uptr_t sem_base; | |
47 | compat_uptr_t sem_pending; | |
48 | compat_uptr_t sem_pending_last; | |
49 | compat_uptr_t undo; | |
50 | unsigned short sem_nsems; | |
51 | }; | |
52 | ||
1da177e4 LT |
53 | struct compat_ipc_kludge { |
54 | compat_uptr_t msgp; | |
55 | compat_long_t msgtyp; | |
56 | }; | |
57 | ||
553f770e | 58 | static inline int __compat_ipc_parse_version(int *cmd) |
1da177e4 | 59 | { |
c1d7e01d | 60 | #ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION |
1da177e4 LT |
61 | int version = *cmd & IPC_64; |
62 | ||
63 | /* this is tricky: architectures that have support for the old | |
64 | * ipc structures in 64 bit binaries need to have IPC_64 set | |
65 | * in cmd, the others need to have it cleared */ | |
66 | #ifndef ipc_parse_version | |
67 | *cmd |= IPC_64; | |
68 | #else | |
69 | *cmd &= ~IPC_64; | |
70 | #endif | |
71 | return version; | |
48b25c43 CM |
72 | #else |
73 | /* With the asm-generic APIs, we always use the 64-bit versions. */ | |
74 | return IPC_64; | |
75 | #endif | |
1da177e4 LT |
76 | } |
77 | ||
78 | static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64, | |
79 | struct compat_ipc64_perm __user *up64) | |
80 | { | |
81 | int err; | |
82 | ||
83 | err = __get_user(p64->uid, &up64->uid); | |
84 | err |= __get_user(p64->gid, &up64->gid); | |
85 | err |= __get_user(p64->mode, &up64->mode); | |
86 | return err; | |
87 | } | |
88 | ||
89 | static inline int __get_compat_ipc_perm(struct ipc64_perm *p, | |
90 | struct compat_ipc_perm __user *up) | |
91 | { | |
92 | int err; | |
93 | ||
94 | err = __get_user(p->uid, &up->uid); | |
95 | err |= __get_user(p->gid, &up->gid); | |
96 | err |= __get_user(p->mode, &up->mode); | |
97 | return err; | |
98 | } | |
99 | ||
100 | static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64, | |
101 | struct compat_ipc64_perm __user *up64) | |
102 | { | |
103 | int err; | |
104 | ||
105 | err = __put_user(p64->key, &up64->key); | |
106 | err |= __put_user(p64->uid, &up64->uid); | |
107 | err |= __put_user(p64->gid, &up64->gid); | |
108 | err |= __put_user(p64->cuid, &up64->cuid); | |
109 | err |= __put_user(p64->cgid, &up64->cgid); | |
110 | err |= __put_user(p64->mode, &up64->mode); | |
111 | err |= __put_user(p64->seq, &up64->seq); | |
112 | return err; | |
113 | } | |
114 | ||
115 | static inline int __put_compat_ipc_perm(struct ipc64_perm *p, | |
0d5e7580 | 116 | struct compat_ipc_perm __user *uip) |
1da177e4 LT |
117 | { |
118 | int err; | |
202e5979 SR |
119 | __compat_uid_t u; |
120 | __compat_gid_t g; | |
1da177e4 | 121 | |
0d5e7580 | 122 | err = __put_user(p->key, &uip->key); |
1da177e4 | 123 | SET_UID(u, p->uid); |
0d5e7580 | 124 | err |= __put_user(u, &uip->uid); |
1da177e4 | 125 | SET_GID(g, p->gid); |
0d5e7580 | 126 | err |= __put_user(g, &uip->gid); |
1da177e4 | 127 | SET_UID(u, p->cuid); |
0d5e7580 | 128 | err |= __put_user(u, &uip->cuid); |
1da177e4 | 129 | SET_GID(g, p->cgid); |
0d5e7580 MR |
130 | err |= __put_user(g, &uip->cgid); |
131 | err |= __put_user(p->mode, &uip->mode); | |
132 | err |= __put_user(p->seq, &uip->seq); | |
1da177e4 LT |
133 | return err; |
134 | } | |
135 | ||
0d5e7580 | 136 | static inline int get_compat_semid64_ds(struct semid64_ds *sem64, |
1da177e4 LT |
137 | struct compat_semid64_ds __user *up64) |
138 | { | |
239521f3 | 139 | if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) |
1da177e4 | 140 | return -EFAULT; |
0d5e7580 | 141 | return __get_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm); |
1da177e4 LT |
142 | } |
143 | ||
144 | static inline int get_compat_semid_ds(struct semid64_ds *s, | |
145 | struct compat_semid_ds __user *up) | |
146 | { | |
239521f3 | 147 | if (!access_ok(VERIFY_READ, up, sizeof(*up))) |
1da177e4 LT |
148 | return -EFAULT; |
149 | return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm); | |
150 | } | |
151 | ||
0d5e7580 | 152 | static inline int put_compat_semid64_ds(struct semid64_ds *sem64, |
1da177e4 LT |
153 | struct compat_semid64_ds __user *up64) |
154 | { | |
155 | int err; | |
156 | ||
239521f3 | 157 | if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) |
1da177e4 | 158 | return -EFAULT; |
0d5e7580 MR |
159 | err = __put_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm); |
160 | err |= __put_user(sem64->sem_otime, &up64->sem_otime); | |
161 | err |= __put_user(sem64->sem_ctime, &up64->sem_ctime); | |
162 | err |= __put_user(sem64->sem_nsems, &up64->sem_nsems); | |
1da177e4 LT |
163 | return err; |
164 | } | |
165 | ||
166 | static inline int put_compat_semid_ds(struct semid64_ds *s, | |
167 | struct compat_semid_ds __user *up) | |
168 | { | |
169 | int err; | |
170 | ||
239521f3 | 171 | if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) |
d57d9731 | 172 | return -EFAULT; |
1da177e4 LT |
173 | err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm); |
174 | err |= __put_user(s->sem_otime, &up->sem_otime); | |
175 | err |= __put_user(s->sem_ctime, &up->sem_ctime); | |
176 | err |= __put_user(s->sem_nsems, &up->sem_nsems); | |
177 | return err; | |
178 | } | |
179 | ||
48b25c43 | 180 | static long do_compat_semctl(int first, int second, int third, u32 pad) |
1da177e4 | 181 | { |
e1fd1f49 | 182 | unsigned long fourth; |
1da177e4 | 183 | int err, err2; |
0d5e7580 | 184 | struct semid64_ds sem64; |
1da177e4 | 185 | struct semid64_ds __user *up64; |
553f770e | 186 | int version = __compat_ipc_parse_version(&third); |
1da177e4 | 187 | |
0d5e7580 | 188 | memset(&sem64, 0, sizeof(sem64)); |
03145beb | 189 | |
1da177e4 | 190 | if ((third & (~IPC_64)) == SETVAL) |
e1fd1f49 AV |
191 | #ifdef __BIG_ENDIAN |
192 | fourth = (unsigned long)pad << 32; | |
193 | #else | |
194 | fourth = pad; | |
195 | #endif | |
1da177e4 | 196 | else |
e1fd1f49 | 197 | fourth = (unsigned long)compat_ptr(pad); |
1da177e4 LT |
198 | switch (third & (~IPC_64)) { |
199 | case IPC_INFO: | |
200 | case IPC_RMID: | |
201 | case SEM_INFO: | |
202 | case GETVAL: | |
203 | case GETPID: | |
204 | case GETNCNT: | |
205 | case GETZCNT: | |
206 | case GETALL: | |
207 | case SETVAL: | |
208 | case SETALL: | |
209 | err = sys_semctl(first, second, third, fourth); | |
210 | break; | |
211 | ||
212 | case IPC_STAT: | |
213 | case SEM_STAT: | |
0d5e7580 | 214 | up64 = compat_alloc_user_space(sizeof(sem64)); |
e1fd1f49 | 215 | fourth = (unsigned long)up64; |
1da177e4 LT |
216 | err = sys_semctl(first, second, third, fourth); |
217 | if (err < 0) | |
218 | break; | |
0d5e7580 | 219 | if (copy_from_user(&sem64, up64, sizeof(sem64))) |
1da177e4 LT |
220 | err2 = -EFAULT; |
221 | else if (version == IPC_64) | |
0d5e7580 | 222 | err2 = put_compat_semid64_ds(&sem64, compat_ptr(pad)); |
1da177e4 | 223 | else |
0d5e7580 | 224 | err2 = put_compat_semid_ds(&sem64, compat_ptr(pad)); |
1da177e4 LT |
225 | if (err2) |
226 | err = -EFAULT; | |
227 | break; | |
228 | ||
229 | case IPC_SET: | |
3ab08fe2 | 230 | if (version == IPC_64) |
0d5e7580 | 231 | err = get_compat_semid64_ds(&sem64, compat_ptr(pad)); |
3ab08fe2 | 232 | else |
0d5e7580 | 233 | err = get_compat_semid_ds(&sem64, compat_ptr(pad)); |
3ab08fe2 | 234 | |
0d5e7580 MR |
235 | up64 = compat_alloc_user_space(sizeof(sem64)); |
236 | if (copy_to_user(up64, &sem64, sizeof(sem64))) | |
1da177e4 LT |
237 | err = -EFAULT; |
238 | if (err) | |
239 | break; | |
240 | ||
e1fd1f49 | 241 | fourth = (unsigned long)up64; |
1da177e4 LT |
242 | err = sys_semctl(first, second, third, fourth); |
243 | break; | |
244 | ||
245 | default: | |
246 | err = -EINVAL; | |
247 | break; | |
248 | } | |
249 | return err; | |
250 | } | |
251 | ||
0e65a81b | 252 | static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) |
f9dd87f4 SK |
253 | { |
254 | struct compat_msgbuf __user *msgp = dest; | |
255 | size_t msgsz; | |
256 | ||
257 | if (put_user(msg->m_type, &msgp->mtype)) | |
258 | return -EFAULT; | |
259 | ||
260 | msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; | |
261 | if (store_msg(msgp->mtext, msg, msgsz)) | |
262 | return -EFAULT; | |
263 | return msgsz; | |
264 | } | |
265 | ||
0e65a81b AV |
266 | #ifndef COMPAT_SHMLBA |
267 | #define COMPAT_SHMLBA SHMLBA | |
268 | #endif | |
56e41d3c | 269 | |
0e65a81b | 270 | #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC |
56e41d3c AV |
271 | COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second, |
272 | u32, third, compat_uptr_t, ptr, u32, fifth) | |
273 | { | |
274 | int version; | |
0e65a81b | 275 | u32 pad; |
56e41d3c AV |
276 | |
277 | version = call >> 16; /* hack for backward compatibility */ | |
278 | call &= 0xffff; | |
279 | ||
280 | switch (call) { | |
281 | case SEMOP: | |
282 | /* struct sembuf is the same on 32 and 64bit :)) */ | |
283 | return sys_semtimedop(first, compat_ptr(ptr), second, NULL); | |
284 | case SEMTIMEDOP: | |
285 | return compat_sys_semtimedop(first, compat_ptr(ptr), second, | |
286 | compat_ptr(fifth)); | |
287 | case SEMGET: | |
288 | return sys_semget(first, second, third); | |
289 | case SEMCTL: | |
0e65a81b AV |
290 | if (!ptr) |
291 | return -EINVAL; | |
292 | if (get_user(pad, (u32 __user *) compat_ptr(ptr))) | |
293 | return -EFAULT; | |
294 | return do_compat_semctl(first, second, third, pad); | |
295 | ||
296 | case MSGSND: { | |
297 | struct compat_msgbuf __user *up = compat_ptr(ptr); | |
298 | compat_long_t type; | |
299 | ||
300 | if (first < 0 || second < 0) | |
301 | return -EINVAL; | |
56e41d3c | 302 | |
0e65a81b AV |
303 | if (get_user(type, &up->mtype)) |
304 | return -EFAULT; | |
305 | ||
306 | return do_msgsnd(first, type, up->mtext, second, third); | |
307 | } | |
308 | case MSGRCV: { | |
309 | void __user *uptr = compat_ptr(ptr); | |
310 | ||
311 | if (first < 0 || second < 0) | |
312 | return -EINVAL; | |
313 | ||
314 | if (!version) { | |
315 | struct compat_ipc_kludge ipck; | |
316 | if (!uptr) | |
317 | return -EINVAL; | |
239521f3 | 318 | if (copy_from_user(&ipck, uptr, sizeof(ipck))) |
0e65a81b AV |
319 | return -EFAULT; |
320 | uptr = compat_ptr(ipck.msgp); | |
321 | fifth = ipck.msgtyp; | |
322 | } | |
e7ca2552 | 323 | return do_msgrcv(first, uptr, second, (s32)fifth, third, |
0e65a81b AV |
324 | compat_do_msg_fill); |
325 | } | |
56e41d3c AV |
326 | case MSGGET: |
327 | return sys_msgget(first, second); | |
328 | case MSGCTL: | |
329 | return compat_sys_msgctl(first, second, compat_ptr(ptr)); | |
330 | ||
0e65a81b AV |
331 | case SHMAT: { |
332 | int err; | |
333 | unsigned long raddr; | |
334 | ||
335 | if (version == 1) | |
336 | return -EINVAL; | |
337 | err = do_shmat(first, compat_ptr(ptr), second, &raddr, | |
338 | COMPAT_SHMLBA); | |
339 | if (err < 0) | |
340 | return err; | |
341 | return put_user(raddr, (compat_ulong_t *)compat_ptr(third)); | |
342 | } | |
56e41d3c AV |
343 | case SHMDT: |
344 | return sys_shmdt(compat_ptr(ptr)); | |
345 | case SHMGET: | |
346 | return sys_shmget(first, (unsigned)second, third); | |
347 | case SHMCTL: | |
348 | return compat_sys_shmctl(first, second, compat_ptr(ptr)); | |
349 | } | |
350 | ||
351 | return -ENOSYS; | |
352 | } | |
0e65a81b AV |
353 | #endif |
354 | ||
355 | COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg) | |
48b25c43 CM |
356 | { |
357 | return do_compat_semctl(semid, semnum, cmd, arg); | |
358 | } | |
359 | ||
0e65a81b AV |
360 | COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp, |
361 | compat_ssize_t, msgsz, int, msgflg) | |
48b25c43 | 362 | { |
0e65a81b | 363 | struct compat_msgbuf __user *up = compat_ptr(msgp); |
48b25c43 CM |
364 | compat_long_t mtype; |
365 | ||
0e65a81b | 366 | if (get_user(mtype, &up->mtype)) |
48b25c43 | 367 | return -EFAULT; |
0e65a81b | 368 | return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg); |
48b25c43 CM |
369 | } |
370 | ||
0e65a81b | 371 | COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp, |
291fdb0b | 372 | compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg) |
48b25c43 | 373 | { |
291fdb0b | 374 | return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp, |
0e65a81b | 375 | msgflg, compat_do_msg_fill); |
48b25c43 | 376 | } |
1da177e4 | 377 | |
0e65a81b | 378 | COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg) |
48b25c43 CM |
379 | { |
380 | unsigned long ret; | |
381 | long err; | |
382 | ||
079a96ae | 383 | err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA); |
48b25c43 CM |
384 | if (err) |
385 | return err; | |
386 | force_successful_syscall_return(); | |
387 | return (long)ret; | |
388 | } | |
1da177e4 | 389 | |
5d70a596 HC |
390 | COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems, |
391 | unsigned, nsops, | |
392 | const struct compat_timespec __user *, timeout) | |
1da177e4 | 393 | { |
81993e81 PA |
394 | struct timespec __user *ts64; |
395 | if (compat_convert_timespec(&ts64, timeout)) | |
396 | return -EFAULT; | |
1da177e4 LT |
397 | return sys_semtimedop(semid, tsems, nsops, ts64); |
398 | } |