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Merge tag 'dlm-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
[linux-2.6.git] / net / compat.c
blob89032580bd1d8aa5ef29d1395661bdd0bcfe95f1
1 /*
2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
3 *
4 * Copyright (C) 2000 VA Linux Co
5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
9 * Copyright (C) 2000 Hewlett-Packard Co.
10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/gfp.h>
16 #include <linux/fs.h>
17 #include <linux/types.h>
18 #include <linux/file.h>
19 #include <linux/icmpv6.h>
20 #include <linux/socket.h>
21 #include <linux/syscalls.h>
22 #include <linux/filter.h>
23 #include <linux/compat.h>
24 #include <linux/security.h>
25 #include <linux/export.h>
26
27 #include <net/scm.h>
28 #include <net/sock.h>
29 #include <net/ip.h>
30 #include <net/ipv6.h>
31 #include <asm/uaccess.h>
32 #include <net/compat.h>
33
34 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
35 struct compat_iovec __user *uiov32,
36 int niov)
37 {
38 int tot_len = 0;
39
40 while (niov > 0) {
41 compat_uptr_t buf;
42 compat_size_t len;
43
44 if (get_user(len, &uiov32->iov_len) ||
45 get_user(buf, &uiov32->iov_base))
46 return -EFAULT;
47
48 if (len > INT_MAX - tot_len)
49 len = INT_MAX - tot_len;
50
51 tot_len += len;
52 kiov->iov_base = compat_ptr(buf);
53 kiov->iov_len = (__kernel_size_t) len;
54 uiov32++;
55 kiov++;
56 niov--;
57 }
58 return tot_len;
59 }
60
61 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
62 {
63 compat_uptr_t tmp1, tmp2, tmp3;
64
65 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
66 __get_user(tmp1, &umsg->msg_name) ||
67 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
68 __get_user(tmp2, &umsg->msg_iov) ||
69 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
70 __get_user(tmp3, &umsg->msg_control) ||
71 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
72 __get_user(kmsg->msg_flags, &umsg->msg_flags))
73 return -EFAULT;
74 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
75 return -EINVAL;
76 kmsg->msg_name = compat_ptr(tmp1);
77 kmsg->msg_iov = compat_ptr(tmp2);
78 kmsg->msg_control = compat_ptr(tmp3);
79 return 0;
80 }
81
82 /* I've named the args so it is easy to tell whose space the pointers are in. */
83 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
84 struct sockaddr_storage *kern_address, int mode)
85 {
86 int tot_len;
87
88 if (kern_msg->msg_namelen) {
89 if (mode == VERIFY_READ) {
90 int err = move_addr_to_kernel(kern_msg->msg_name,
91 kern_msg->msg_namelen,
92 kern_address);
93 if (err < 0)
94 return err;
95 }
96 kern_msg->msg_name = kern_address;
97 } else
98 kern_msg->msg_name = NULL;
99
100 tot_len = iov_from_user_compat_to_kern(kern_iov,
101 (struct compat_iovec __user *)kern_msg->msg_iov,
102 kern_msg->msg_iovlen);
103 if (tot_len >= 0)
104 kern_msg->msg_iov = kern_iov;
105
106 return tot_len;
107 }
108
109 /* Bleech... */
110 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
111
112 #define CMSG_COMPAT_DATA(cmsg) \
113 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
114 #define CMSG_COMPAT_SPACE(len) \
115 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
116 #define CMSG_COMPAT_LEN(len) \
117 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
118
119 #define CMSG_COMPAT_FIRSTHDR(msg) \
120 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
121 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
122 (struct compat_cmsghdr __user *)NULL)
123
124 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
125 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
126 (ucmlen) <= (unsigned long) \
127 ((mhdr)->msg_controllen - \
128 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
129
130 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
131 struct compat_cmsghdr __user *cmsg, int cmsg_len)
132 {
133 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
134 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
135 msg->msg_controllen)
136 return NULL;
137 return (struct compat_cmsghdr __user *)ptr;
138 }
139
140 /* There is a lot of hair here because the alignment rules (and
141 * thus placement) of cmsg headers and length are different for
142 * 32-bit apps. -DaveM
143 */
144 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
145 unsigned char *stackbuf, int stackbuf_size)
146 {
147 struct compat_cmsghdr __user *ucmsg;
148 struct cmsghdr *kcmsg, *kcmsg_base;
149 compat_size_t ucmlen;
150 __kernel_size_t kcmlen, tmp;
151 int err = -EFAULT;
152
153 kcmlen = 0;
154 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
155 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
156 while (ucmsg != NULL) {
157 if (get_user(ucmlen, &ucmsg->cmsg_len))
158 return -EFAULT;
159
160 /* Catch bogons. */
161 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
162 return -EINVAL;
163
164 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
165 CMSG_ALIGN(sizeof(struct cmsghdr)));
166 tmp = CMSG_ALIGN(tmp);
167 kcmlen += tmp;
168 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
169 }
170 if (kcmlen == 0)
171 return -EINVAL;
172
173 /* The kcmlen holds the 64-bit version of the control length.
174 * It may not be modified as we do not stick it into the kmsg
175 * until we have successfully copied over all of the data
176 * from the user.
177 */
178 if (kcmlen > stackbuf_size)
179 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
180 if (kcmsg == NULL)
181 return -ENOBUFS;
182
183 /* Now copy them over neatly. */
184 memset(kcmsg, 0, kcmlen);
185 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
186 while (ucmsg != NULL) {
187 if (__get_user(ucmlen, &ucmsg->cmsg_len))
188 goto Efault;
189 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
190 goto Einval;
191 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
192 CMSG_ALIGN(sizeof(struct cmsghdr)));
193 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
194 goto Einval;
195 kcmsg->cmsg_len = tmp;
196 tmp = CMSG_ALIGN(tmp);
197 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
198 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
199 copy_from_user(CMSG_DATA(kcmsg),
200 CMSG_COMPAT_DATA(ucmsg),
201 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
202 goto Efault;
203
204 /* Advance. */
205 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
206 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
207 }
208
209 /* Ok, looks like we made it. Hook it up and return success. */
210 kmsg->msg_control = kcmsg_base;
211 kmsg->msg_controllen = kcmlen;
212 return 0;
213
214 Einval:
215 err = -EINVAL;
216 Efault:
217 if (kcmsg_base != (struct cmsghdr *)stackbuf)
218 sock_kfree_s(sk, kcmsg_base, kcmlen);
219 return err;
220 }
221
222 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
223 {
224 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
225 struct compat_cmsghdr cmhdr;
226 struct compat_timeval ctv;
227 struct compat_timespec cts[3];
228 int cmlen;
229
230 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
231 kmsg->msg_flags |= MSG_CTRUNC;
232 return 0; /* XXX: return error? check spec. */
233 }
234
235 if (!COMPAT_USE_64BIT_TIME) {
236 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
237 struct timeval *tv = (struct timeval *)data;
238 ctv.tv_sec = tv->tv_sec;
239 ctv.tv_usec = tv->tv_usec;
240 data = &ctv;
241 len = sizeof(ctv);
242 }
243 if (level == SOL_SOCKET &&
244 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
245 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
246 int i;
247 struct timespec *ts = (struct timespec *)data;
248 for (i = 0; i < count; i++) {
249 cts[i].tv_sec = ts[i].tv_sec;
250 cts[i].tv_nsec = ts[i].tv_nsec;
251 }
252 data = &cts;
253 len = sizeof(cts[0]) * count;
254 }
255 }
256
257 cmlen = CMSG_COMPAT_LEN(len);
258 if (kmsg->msg_controllen < cmlen) {
259 kmsg->msg_flags |= MSG_CTRUNC;
260 cmlen = kmsg->msg_controllen;
261 }
262 cmhdr.cmsg_level = level;
263 cmhdr.cmsg_type = type;
264 cmhdr.cmsg_len = cmlen;
265
266 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
267 return -EFAULT;
268 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
269 return -EFAULT;
270 cmlen = CMSG_COMPAT_SPACE(len);
271 if (kmsg->msg_controllen < cmlen)
272 cmlen = kmsg->msg_controllen;
273 kmsg->msg_control += cmlen;
274 kmsg->msg_controllen -= cmlen;
275 return 0;
276 }
277
278 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
279 {
280 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
281 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
282 int fdnum = scm->fp->count;
283 struct file **fp = scm->fp->fp;
284 int __user *cmfptr;
285 int err = 0, i;
286
287 if (fdnum < fdmax)
288 fdmax = fdnum;
289
290 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
291 int new_fd;
292 err = security_file_receive(fp[i]);
293 if (err)
294 break;
295 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
296 ? O_CLOEXEC : 0);
297 if (err < 0)
298 break;
299 new_fd = err;
300 err = put_user(new_fd, cmfptr);
301 if (err) {
302 put_unused_fd(new_fd);
303 break;
304 }
305 /* Bump the usage count and install the file. */
306 fd_install(new_fd, get_file(fp[i]));
307 }
308
309 if (i > 0) {
310 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
311 err = put_user(SOL_SOCKET, &cm->cmsg_level);
312 if (!err)
313 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
314 if (!err)
315 err = put_user(cmlen, &cm->cmsg_len);
316 if (!err) {
317 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
318 kmsg->msg_control += cmlen;
319 kmsg->msg_controllen -= cmlen;
320 }
321 }
322 if (i < fdnum)
323 kmsg->msg_flags |= MSG_CTRUNC;
324
325 /*
326 * All of the files that fit in the message have had their
327 * usage counts incremented, so we just free the list.
328 */
329 __scm_destroy(scm);
330 }
331
332 static int do_set_attach_filter(struct socket *sock, int level, int optname,
333 char __user *optval, unsigned int optlen)
334 {
335 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
336 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
337 compat_uptr_t ptr;
338 u16 len;
339
340 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
341 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
342 __get_user(len, &fprog32->len) ||
343 __get_user(ptr, &fprog32->filter) ||
344 __put_user(len, &kfprog->len) ||
345 __put_user(compat_ptr(ptr), &kfprog->filter))
346 return -EFAULT;
347
348 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
349 sizeof(struct sock_fprog));
350 }
351
352 static int do_set_sock_timeout(struct socket *sock, int level,
353 int optname, char __user *optval, unsigned int optlen)
354 {
355 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
356 struct timeval ktime;
357 mm_segment_t old_fs;
358 int err;
359
360 if (optlen < sizeof(*up))
361 return -EINVAL;
362 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
363 __get_user(ktime.tv_sec, &up->tv_sec) ||
364 __get_user(ktime.tv_usec, &up->tv_usec))
365 return -EFAULT;
366 old_fs = get_fs();
367 set_fs(KERNEL_DS);
368 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
369 set_fs(old_fs);
370
371 return err;
372 }
373
374 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
375 char __user *optval, unsigned int optlen)
376 {
377 if (optname == SO_ATTACH_FILTER)
378 return do_set_attach_filter(sock, level, optname,
379 optval, optlen);
380 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
381 return do_set_sock_timeout(sock, level, optname, optval, optlen);
382
383 return sock_setsockopt(sock, level, optname, optval, optlen);
384 }
385
386 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
387 char __user *optval, unsigned int optlen)
388 {
389 int err;
390 struct socket *sock = sockfd_lookup(fd, &err);
391
392 if (sock) {
393 err = security_socket_setsockopt(sock, level, optname);
394 if (err) {
395 sockfd_put(sock);
396 return err;
397 }
398
399 if (level == SOL_SOCKET)
400 err = compat_sock_setsockopt(sock, level,
401 optname, optval, optlen);
402 else if (sock->ops->compat_setsockopt)
403 err = sock->ops->compat_setsockopt(sock, level,
404 optname, optval, optlen);
405 else
406 err = sock->ops->setsockopt(sock, level,
407 optname, optval, optlen);
408 sockfd_put(sock);
409 }
410 return err;
411 }
412
413 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
414 char __user *optval, int __user *optlen)
415 {
416 struct compat_timeval __user *up;
417 struct timeval ktime;
418 mm_segment_t old_fs;
419 int len, err;
420
421 up = (struct compat_timeval __user *) optval;
422 if (get_user(len, optlen))
423 return -EFAULT;
424 if (len < sizeof(*up))
425 return -EINVAL;
426 len = sizeof(ktime);
427 old_fs = get_fs();
428 set_fs(KERNEL_DS);
429 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
430 set_fs(old_fs);
431
432 if (!err) {
433 if (put_user(sizeof(*up), optlen) ||
434 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
435 __put_user(ktime.tv_sec, &up->tv_sec) ||
436 __put_user(ktime.tv_usec, &up->tv_usec))
437 err = -EFAULT;
438 }
439 return err;
440 }
441
442 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
443 char __user *optval, int __user *optlen)
444 {
445 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
446 return do_get_sock_timeout(sock, level, optname, optval, optlen);
447 return sock_getsockopt(sock, level, optname, optval, optlen);
448 }
449
450 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
451 {
452 struct compat_timeval __user *ctv;
453 int err;
454 struct timeval tv;
455
456 if (COMPAT_USE_64BIT_TIME)
457 return sock_get_timestamp(sk, userstamp);
458
459 ctv = (struct compat_timeval __user *) userstamp;
460 err = -ENOENT;
461 if (!sock_flag(sk, SOCK_TIMESTAMP))
462 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
463 tv = ktime_to_timeval(sk->sk_stamp);
464 if (tv.tv_sec == -1)
465 return err;
466 if (tv.tv_sec == 0) {
467 sk->sk_stamp = ktime_get_real();
468 tv = ktime_to_timeval(sk->sk_stamp);
469 }
470 err = 0;
471 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
472 put_user(tv.tv_usec, &ctv->tv_usec))
473 err = -EFAULT;
474 return err;
475 }
476 EXPORT_SYMBOL(compat_sock_get_timestamp);
477
478 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
479 {
480 struct compat_timespec __user *ctv;
481 int err;
482 struct timespec ts;
483
484 if (COMPAT_USE_64BIT_TIME)
485 return sock_get_timestampns (sk, userstamp);
486
487 ctv = (struct compat_timespec __user *) userstamp;
488 err = -ENOENT;
489 if (!sock_flag(sk, SOCK_TIMESTAMP))
490 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
491 ts = ktime_to_timespec(sk->sk_stamp);
492 if (ts.tv_sec == -1)
493 return err;
494 if (ts.tv_sec == 0) {
495 sk->sk_stamp = ktime_get_real();
496 ts = ktime_to_timespec(sk->sk_stamp);
497 }
498 err = 0;
499 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
500 put_user(ts.tv_nsec, &ctv->tv_nsec))
501 err = -EFAULT;
502 return err;
503 }
504 EXPORT_SYMBOL(compat_sock_get_timestampns);
505
506 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
507 char __user *optval, int __user *optlen)
508 {
509 int err;
510 struct socket *sock = sockfd_lookup(fd, &err);
511
512 if (sock) {
513 err = security_socket_getsockopt(sock, level, optname);
514 if (err) {
515 sockfd_put(sock);
516 return err;
517 }
518
519 if (level == SOL_SOCKET)
520 err = compat_sock_getsockopt(sock, level,
521 optname, optval, optlen);
522 else if (sock->ops->compat_getsockopt)
523 err = sock->ops->compat_getsockopt(sock, level,
524 optname, optval, optlen);
525 else
526 err = sock->ops->getsockopt(sock, level,
527 optname, optval, optlen);
528 sockfd_put(sock);
529 }
530 return err;
531 }
532
533 struct compat_group_req {
534 __u32 gr_interface;
535 struct __kernel_sockaddr_storage gr_group
536 __attribute__ ((aligned(4)));
537 } __packed;
538
539 struct compat_group_source_req {
540 __u32 gsr_interface;
541 struct __kernel_sockaddr_storage gsr_group
542 __attribute__ ((aligned(4)));
543 struct __kernel_sockaddr_storage gsr_source
544 __attribute__ ((aligned(4)));
545 } __packed;
546
547 struct compat_group_filter {
548 __u32 gf_interface;
549 struct __kernel_sockaddr_storage gf_group
550 __attribute__ ((aligned(4)));
551 __u32 gf_fmode;
552 __u32 gf_numsrc;
553 struct __kernel_sockaddr_storage gf_slist[1]
554 __attribute__ ((aligned(4)));
555 } __packed;
556
557 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
558 sizeof(struct __kernel_sockaddr_storage))
559
560
561 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
562 char __user *optval, unsigned int optlen,
563 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
564 {
565 char __user *koptval = optval;
566 int koptlen = optlen;
567
568 switch (optname) {
569 case MCAST_JOIN_GROUP:
570 case MCAST_LEAVE_GROUP:
571 {
572 struct compat_group_req __user *gr32 = (void *)optval;
573 struct group_req __user *kgr =
574 compat_alloc_user_space(sizeof(struct group_req));
575 u32 interface;
576
577 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
578 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
579 __get_user(interface, &gr32->gr_interface) ||
580 __put_user(interface, &kgr->gr_interface) ||
581 copy_in_user(&kgr->gr_group, &gr32->gr_group,
582 sizeof(kgr->gr_group)))
583 return -EFAULT;
584 koptval = (char __user *)kgr;
585 koptlen = sizeof(struct group_req);
586 break;
587 }
588 case MCAST_JOIN_SOURCE_GROUP:
589 case MCAST_LEAVE_SOURCE_GROUP:
590 case MCAST_BLOCK_SOURCE:
591 case MCAST_UNBLOCK_SOURCE:
592 {
593 struct compat_group_source_req __user *gsr32 = (void *)optval;
594 struct group_source_req __user *kgsr = compat_alloc_user_space(
595 sizeof(struct group_source_req));
596 u32 interface;
597
598 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
599 !access_ok(VERIFY_WRITE, kgsr,
600 sizeof(struct group_source_req)) ||
601 __get_user(interface, &gsr32->gsr_interface) ||
602 __put_user(interface, &kgsr->gsr_interface) ||
603 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
604 sizeof(kgsr->gsr_group)) ||
605 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
606 sizeof(kgsr->gsr_source)))
607 return -EFAULT;
608 koptval = (char __user *)kgsr;
609 koptlen = sizeof(struct group_source_req);
610 break;
611 }
612 case MCAST_MSFILTER:
613 {
614 struct compat_group_filter __user *gf32 = (void *)optval;
615 struct group_filter __user *kgf;
616 u32 interface, fmode, numsrc;
617
618 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
619 __get_user(interface, &gf32->gf_interface) ||
620 __get_user(fmode, &gf32->gf_fmode) ||
621 __get_user(numsrc, &gf32->gf_numsrc))
622 return -EFAULT;
623 koptlen = optlen + sizeof(struct group_filter) -
624 sizeof(struct compat_group_filter);
625 if (koptlen < GROUP_FILTER_SIZE(numsrc))
626 return -EINVAL;
627 kgf = compat_alloc_user_space(koptlen);
628 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
629 __put_user(interface, &kgf->gf_interface) ||
630 __put_user(fmode, &kgf->gf_fmode) ||
631 __put_user(numsrc, &kgf->gf_numsrc) ||
632 copy_in_user(&kgf->gf_group, &gf32->gf_group,
633 sizeof(kgf->gf_group)) ||
634 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
635 numsrc * sizeof(kgf->gf_slist[0]))))
636 return -EFAULT;
637 koptval = (char __user *)kgf;
638 break;
639 }
640
641 default:
642 break;
643 }
644 return setsockopt(sock, level, optname, koptval, koptlen);
645 }
646 EXPORT_SYMBOL(compat_mc_setsockopt);
647
648 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
649 char __user *optval, int __user *optlen,
650 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
651 {
652 struct compat_group_filter __user *gf32 = (void *)optval;
653 struct group_filter __user *kgf;
654 int __user *koptlen;
655 u32 interface, fmode, numsrc;
656 int klen, ulen, err;
657
658 if (optname != MCAST_MSFILTER)
659 return getsockopt(sock, level, optname, optval, optlen);
660
661 koptlen = compat_alloc_user_space(sizeof(*koptlen));
662 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
663 __get_user(ulen, optlen))
664 return -EFAULT;
665
666 /* adjust len for pad */
667 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
668
669 if (klen < GROUP_FILTER_SIZE(0))
670 return -EINVAL;
671
672 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
673 __put_user(klen, koptlen))
674 return -EFAULT;
675
676 /* have to allow space for previous compat_alloc_user_space, too */
677 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
678
679 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
680 __get_user(interface, &gf32->gf_interface) ||
681 __get_user(fmode, &gf32->gf_fmode) ||
682 __get_user(numsrc, &gf32->gf_numsrc) ||
683 __put_user(interface, &kgf->gf_interface) ||
684 __put_user(fmode, &kgf->gf_fmode) ||
685 __put_user(numsrc, &kgf->gf_numsrc) ||
686 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
687 return -EFAULT;
688
689 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
690 if (err)
691 return err;
692
693 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
694 __get_user(klen, koptlen))
695 return -EFAULT;
696
697 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
698
699 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
700 __put_user(ulen, optlen))
701 return -EFAULT;
702
703 if (!access_ok(VERIFY_READ, kgf, klen) ||
704 !access_ok(VERIFY_WRITE, gf32, ulen) ||
705 __get_user(interface, &kgf->gf_interface) ||
706 __get_user(fmode, &kgf->gf_fmode) ||
707 __get_user(numsrc, &kgf->gf_numsrc) ||
708 __put_user(interface, &gf32->gf_interface) ||
709 __put_user(fmode, &gf32->gf_fmode) ||
710 __put_user(numsrc, &gf32->gf_numsrc))
711 return -EFAULT;
712 if (numsrc) {
713 int copylen;
714
715 klen -= GROUP_FILTER_SIZE(0);
716 copylen = numsrc * sizeof(gf32->gf_slist[0]);
717 if (copylen > klen)
718 copylen = klen;
719 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
720 return -EFAULT;
721 }
722 return err;
723 }
724 EXPORT_SYMBOL(compat_mc_getsockopt);
725
726
727 /* Argument list sizes for compat_sys_socketcall */
728 #define AL(x) ((x) * sizeof(u32))
729 static unsigned char nas[21] = {
730 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
731 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
732 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
733 AL(4), AL(5), AL(4)
734 };
735 #undef AL
736
737 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
738 {
739 if (flags & MSG_CMSG_COMPAT)
740 return -EINVAL;
741 return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
742 }
743
744 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
745 unsigned int vlen, unsigned int flags)
746 {
747 if (flags & MSG_CMSG_COMPAT)
748 return -EINVAL;
749 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
750 flags | MSG_CMSG_COMPAT);
751 }
752
753 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
754 {
755 if (flags & MSG_CMSG_COMPAT)
756 return -EINVAL;
757 return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
758 }
759
760 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
761 {
762 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
763 }
764
765 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
766 unsigned int flags, struct sockaddr __user *addr,
767 int __user *addrlen)
768 {
769 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
770 }
771
772 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
773 unsigned int vlen, unsigned int flags,
774 struct compat_timespec __user *timeout)
775 {
776 int datagrams;
777 struct timespec ktspec;
778
779 if (flags & MSG_CMSG_COMPAT)
780 return -EINVAL;
781
782 if (COMPAT_USE_64BIT_TIME)
783 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
784 flags | MSG_CMSG_COMPAT,
785 (struct timespec *) timeout);
786
787 if (timeout == NULL)
788 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
789 flags | MSG_CMSG_COMPAT, NULL);
790
791 if (get_compat_timespec(&ktspec, timeout))
792 return -EFAULT;
793
794 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
795 flags | MSG_CMSG_COMPAT, &ktspec);
796 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
797 datagrams = -EFAULT;
798
799 return datagrams;
800 }
801
802 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
803 {
804 int ret;
805 u32 a[6];
806 u32 a0, a1;
807
808 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
809 return -EINVAL;
810 if (copy_from_user(a, args, nas[call]))
811 return -EFAULT;
812 a0 = a[0];
813 a1 = a[1];
814
815 switch (call) {
816 case SYS_SOCKET:
817 ret = sys_socket(a0, a1, a[2]);
818 break;
819 case SYS_BIND:
820 ret = sys_bind(a0, compat_ptr(a1), a[2]);
821 break;
822 case SYS_CONNECT:
823 ret = sys_connect(a0, compat_ptr(a1), a[2]);
824 break;
825 case SYS_LISTEN:
826 ret = sys_listen(a0, a1);
827 break;
828 case SYS_ACCEPT:
829 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
830 break;
831 case SYS_GETSOCKNAME:
832 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
833 break;
834 case SYS_GETPEERNAME:
835 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
836 break;
837 case SYS_SOCKETPAIR:
838 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
839 break;
840 case SYS_SEND:
841 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
842 break;
843 case SYS_SENDTO:
844 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
845 break;
846 case SYS_RECV:
847 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
848 break;
849 case SYS_RECVFROM:
850 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
851 compat_ptr(a[4]), compat_ptr(a[5]));
852 break;
853 case SYS_SHUTDOWN:
854 ret = sys_shutdown(a0, a1);
855 break;
856 case SYS_SETSOCKOPT:
857 ret = compat_sys_setsockopt(a0, a1, a[2],
858 compat_ptr(a[3]), a[4]);
859 break;
860 case SYS_GETSOCKOPT:
861 ret = compat_sys_getsockopt(a0, a1, a[2],
862 compat_ptr(a[3]), compat_ptr(a[4]));
863 break;
864 case SYS_SENDMSG:
865 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
866 break;
867 case SYS_SENDMMSG:
868 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
869 break;
870 case SYS_RECVMSG:
871 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
872 break;
873 case SYS_RECVMMSG:
874 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
875 compat_ptr(a[4]));
876 break;
877 case SYS_ACCEPT4:
878 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
879 break;
880 default:
881 ret = -EINVAL;
882 break;
883 }
884 return ret;
885 }
Linus' kernel tree