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ocfs2: fix ocfs2 read block panic
[linux-2.6/btrfs-unstable.git] / net / compat.c
blob3b2105f6549de490182dbebeddf0e3eca25b37e2
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/audit.h>
26 #include <linux/export.h>
27
28 #include <net/scm.h>
29 #include <net/sock.h>
30 #include <net/ip.h>
31 #include <net/ipv6.h>
32 #include <linux/uaccess.h>
33 #include <net/compat.h>
34
35 int get_compat_msghdr(struct msghdr *kmsg,
36 struct compat_msghdr __user *umsg,
37 struct sockaddr __user **save_addr,
38 struct iovec **iov)
39 {
40 struct compat_msghdr msg;
41 ssize_t err;
42
43 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
44 return -EFAULT;
45
46 kmsg->msg_flags = msg.msg_flags;
47 kmsg->msg_namelen = msg.msg_namelen;
48
49 if (!msg.msg_name)
50 kmsg->msg_namelen = 0;
51
52 if (kmsg->msg_namelen < 0)
53 return -EINVAL;
54
55 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
56 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
57
58 kmsg->msg_control = compat_ptr(msg.msg_control);
59 kmsg->msg_controllen = msg.msg_controllen;
60
61 if (save_addr)
62 *save_addr = compat_ptr(msg.msg_name);
63
64 if (msg.msg_name && kmsg->msg_namelen) {
65 if (!save_addr) {
66 err = move_addr_to_kernel(compat_ptr(msg.msg_name),
67 kmsg->msg_namelen,
68 kmsg->msg_name);
69 if (err < 0)
70 return err;
71 }
72 } else {
73 kmsg->msg_name = NULL;
74 kmsg->msg_namelen = 0;
75 }
76
77 if (msg.msg_iovlen > UIO_MAXIOV)
78 return -EMSGSIZE;
79
80 kmsg->msg_iocb = NULL;
81
82 return compat_import_iovec(save_addr ? READ : WRITE,
83 compat_ptr(msg.msg_iov), msg.msg_iovlen,
84 UIO_FASTIOV, iov, &kmsg->msg_iter);
85 }
86
87 /* Bleech... */
88 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
89
90 #define CMSG_COMPAT_DATA(cmsg) \
91 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
92 #define CMSG_COMPAT_SPACE(len) \
93 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
94 #define CMSG_COMPAT_LEN(len) \
95 (sizeof(struct compat_cmsghdr) + (len))
96
97 #define CMSG_COMPAT_FIRSTHDR(msg) \
98 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
99 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
100 (struct compat_cmsghdr __user *)NULL)
101
102 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
103 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
104 (ucmlen) <= (unsigned long) \
105 ((mhdr)->msg_controllen - \
106 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
107
108 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
109 struct compat_cmsghdr __user *cmsg, int cmsg_len)
110 {
111 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
112 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
113 msg->msg_controllen)
114 return NULL;
115 return (struct compat_cmsghdr __user *)ptr;
116 }
117
118 /* There is a lot of hair here because the alignment rules (and
119 * thus placement) of cmsg headers and length are different for
120 * 32-bit apps. -DaveM
121 */
122 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
123 unsigned char *stackbuf, int stackbuf_size)
124 {
125 struct compat_cmsghdr __user *ucmsg;
126 struct cmsghdr *kcmsg, *kcmsg_base;
127 compat_size_t ucmlen;
128 __kernel_size_t kcmlen, tmp;
129 int err = -EFAULT;
130
131 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
132 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
133
134 kcmlen = 0;
135 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
136 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
137 while (ucmsg != NULL) {
138 if (get_user(ucmlen, &ucmsg->cmsg_len))
139 return -EFAULT;
140
141 /* Catch bogons. */
142 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
143 return -EINVAL;
144
145 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
146 tmp = CMSG_ALIGN(tmp);
147 kcmlen += tmp;
148 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
149 }
150 if (kcmlen == 0)
151 return -EINVAL;
152
153 /* The kcmlen holds the 64-bit version of the control length.
154 * It may not be modified as we do not stick it into the kmsg
155 * until we have successfully copied over all of the data
156 * from the user.
157 */
158 if (kcmlen > stackbuf_size)
159 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
160 if (kcmsg == NULL)
161 return -ENOBUFS;
162
163 /* Now copy them over neatly. */
164 memset(kcmsg, 0, kcmlen);
165 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
166 while (ucmsg != NULL) {
167 if (__get_user(ucmlen, &ucmsg->cmsg_len))
168 goto Efault;
169 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
170 goto Einval;
171 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
172 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
173 goto Einval;
174 kcmsg->cmsg_len = tmp;
175 tmp = CMSG_ALIGN(tmp);
176 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
177 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
178 copy_from_user(CMSG_DATA(kcmsg),
179 CMSG_COMPAT_DATA(ucmsg),
180 (ucmlen - sizeof(*ucmsg))))
181 goto Efault;
182
183 /* Advance. */
184 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
185 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
186 }
187
188 /*
189 * check the length of messages copied in is the same as the
190 * what we get from the first loop
191 */
192 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
193 goto Einval;
194
195 /* Ok, looks like we made it. Hook it up and return success. */
196 kmsg->msg_control = kcmsg_base;
197 kmsg->msg_controllen = kcmlen;
198 return 0;
199
200 Einval:
201 err = -EINVAL;
202 Efault:
203 if (kcmsg_base != (struct cmsghdr *)stackbuf)
204 sock_kfree_s(sk, kcmsg_base, kcmlen);
205 return err;
206 }
207
208 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
209 {
210 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
211 struct compat_cmsghdr cmhdr;
212 struct compat_timeval ctv;
213 struct compat_timespec cts[3];
214 int cmlen;
215
216 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
217 kmsg->msg_flags |= MSG_CTRUNC;
218 return 0; /* XXX: return error? check spec. */
219 }
220
221 if (!COMPAT_USE_64BIT_TIME) {
222 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
223 struct timeval *tv = (struct timeval *)data;
224 ctv.tv_sec = tv->tv_sec;
225 ctv.tv_usec = tv->tv_usec;
226 data = &ctv;
227 len = sizeof(ctv);
228 }
229 if (level == SOL_SOCKET &&
230 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
231 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
232 int i;
233 struct timespec *ts = (struct timespec *)data;
234 for (i = 0; i < count; i++) {
235 cts[i].tv_sec = ts[i].tv_sec;
236 cts[i].tv_nsec = ts[i].tv_nsec;
237 }
238 data = &cts;
239 len = sizeof(cts[0]) * count;
240 }
241 }
242
243 cmlen = CMSG_COMPAT_LEN(len);
244 if (kmsg->msg_controllen < cmlen) {
245 kmsg->msg_flags |= MSG_CTRUNC;
246 cmlen = kmsg->msg_controllen;
247 }
248 cmhdr.cmsg_level = level;
249 cmhdr.cmsg_type = type;
250 cmhdr.cmsg_len = cmlen;
251
252 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
253 return -EFAULT;
254 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
255 return -EFAULT;
256 cmlen = CMSG_COMPAT_SPACE(len);
257 if (kmsg->msg_controllen < cmlen)
258 cmlen = kmsg->msg_controllen;
259 kmsg->msg_control += cmlen;
260 kmsg->msg_controllen -= cmlen;
261 return 0;
262 }
263
264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
265 {
266 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
267 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
268 int fdnum = scm->fp->count;
269 struct file **fp = scm->fp->fp;
270 int __user *cmfptr;
271 int err = 0, i;
272
273 if (fdnum < fdmax)
274 fdmax = fdnum;
275
276 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
277 int new_fd;
278 err = security_file_receive(fp[i]);
279 if (err)
280 break;
281 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
282 ? O_CLOEXEC : 0);
283 if (err < 0)
284 break;
285 new_fd = err;
286 err = put_user(new_fd, cmfptr);
287 if (err) {
288 put_unused_fd(new_fd);
289 break;
290 }
291 /* Bump the usage count and install the file. */
292 fd_install(new_fd, get_file(fp[i]));
293 }
294
295 if (i > 0) {
296 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
297 err = put_user(SOL_SOCKET, &cm->cmsg_level);
298 if (!err)
299 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
300 if (!err)
301 err = put_user(cmlen, &cm->cmsg_len);
302 if (!err) {
303 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
304 kmsg->msg_control += cmlen;
305 kmsg->msg_controllen -= cmlen;
306 }
307 }
308 if (i < fdnum)
309 kmsg->msg_flags |= MSG_CTRUNC;
310
311 /*
312 * All of the files that fit in the message have had their
313 * usage counts incremented, so we just free the list.
314 */
315 __scm_destroy(scm);
316 }
317
318 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
319 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
320 {
321 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
322 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
323 struct compat_sock_fprog f32;
324 struct sock_fprog f;
325
326 if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
327 return NULL;
328 memset(&f, 0, sizeof(f));
329 f.len = f32.len;
330 f.filter = compat_ptr(f32.filter);
331 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
332 return NULL;
333
334 return kfprog;
335 }
336 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
337
338 static int do_set_attach_filter(struct socket *sock, int level, int optname,
339 char __user *optval, unsigned int optlen)
340 {
341 struct sock_fprog __user *kfprog;
342
343 kfprog = get_compat_bpf_fprog(optval);
344 if (!kfprog)
345 return -EFAULT;
346
347 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
348 sizeof(struct sock_fprog));
349 }
350
351 static int do_set_sock_timeout(struct socket *sock, int level,
352 int optname, char __user *optval, unsigned int optlen)
353 {
354 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
355 struct timeval ktime;
356 mm_segment_t old_fs;
357 int err;
358
359 if (optlen < sizeof(*up))
360 return -EINVAL;
361 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
362 __get_user(ktime.tv_sec, &up->tv_sec) ||
363 __get_user(ktime.tv_usec, &up->tv_usec))
364 return -EFAULT;
365 old_fs = get_fs();
366 set_fs(KERNEL_DS);
367 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
368 set_fs(old_fs);
369
370 return err;
371 }
372
373 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
374 char __user *optval, unsigned int optlen)
375 {
376 if (optname == SO_ATTACH_FILTER ||
377 optname == SO_ATTACH_REUSEPORT_CBPF)
378 return do_set_attach_filter(sock, level, optname,
379 optval, optlen);
380 if (!COMPAT_USE_64BIT_TIME &&
381 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
382 return do_set_sock_timeout(sock, level, optname, optval, optlen);
383
384 return sock_setsockopt(sock, level, optname, optval, optlen);
385 }
386
387 static int __compat_sys_setsockopt(int fd, int level, int optname,
388 char __user *optval, unsigned int optlen)
389 {
390 int err;
391 struct socket *sock = sockfd_lookup(fd, &err);
392
393 if (sock) {
394 err = security_socket_setsockopt(sock, level, optname);
395 if (err) {
396 sockfd_put(sock);
397 return err;
398 }
399
400 if (level == SOL_SOCKET)
401 err = compat_sock_setsockopt(sock, level,
402 optname, optval, optlen);
403 else if (sock->ops->compat_setsockopt)
404 err = sock->ops->compat_setsockopt(sock, level,
405 optname, optval, optlen);
406 else
407 err = sock->ops->setsockopt(sock, level,
408 optname, optval, optlen);
409 sockfd_put(sock);
410 }
411 return err;
412 }
413
414 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
415 char __user *, optval, unsigned int, optlen)
416 {
417 return __compat_sys_setsockopt(fd, level, optname, optval, optlen);
418 }
419
420 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
421 char __user *optval, int __user *optlen)
422 {
423 struct compat_timeval __user *up;
424 struct timeval ktime;
425 mm_segment_t old_fs;
426 int len, err;
427
428 up = (struct compat_timeval __user *) optval;
429 if (get_user(len, optlen))
430 return -EFAULT;
431 if (len < sizeof(*up))
432 return -EINVAL;
433 len = sizeof(ktime);
434 old_fs = get_fs();
435 set_fs(KERNEL_DS);
436 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
437 set_fs(old_fs);
438
439 if (!err) {
440 if (put_user(sizeof(*up), optlen) ||
441 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
442 __put_user(ktime.tv_sec, &up->tv_sec) ||
443 __put_user(ktime.tv_usec, &up->tv_usec))
444 err = -EFAULT;
445 }
446 return err;
447 }
448
449 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
450 char __user *optval, int __user *optlen)
451 {
452 if (!COMPAT_USE_64BIT_TIME &&
453 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
454 return do_get_sock_timeout(sock, level, optname, optval, optlen);
455 return sock_getsockopt(sock, level, optname, optval, optlen);
456 }
457
458 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
459 {
460 struct compat_timeval __user *ctv;
461 int err;
462 struct timeval tv;
463
464 if (COMPAT_USE_64BIT_TIME)
465 return sock_get_timestamp(sk, userstamp);
466
467 ctv = (struct compat_timeval __user *) userstamp;
468 err = -ENOENT;
469 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
470 tv = ktime_to_timeval(sk->sk_stamp);
471 if (tv.tv_sec == -1)
472 return err;
473 if (tv.tv_sec == 0) {
474 sk->sk_stamp = ktime_get_real();
475 tv = ktime_to_timeval(sk->sk_stamp);
476 }
477 err = 0;
478 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
479 put_user(tv.tv_usec, &ctv->tv_usec))
480 err = -EFAULT;
481 return err;
482 }
483 EXPORT_SYMBOL(compat_sock_get_timestamp);
484
485 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
486 {
487 struct compat_timespec __user *ctv;
488 int err;
489 struct timespec ts;
490
491 if (COMPAT_USE_64BIT_TIME)
492 return sock_get_timestampns (sk, userstamp);
493
494 ctv = (struct compat_timespec __user *) userstamp;
495 err = -ENOENT;
496 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
497 ts = ktime_to_timespec(sk->sk_stamp);
498 if (ts.tv_sec == -1)
499 return err;
500 if (ts.tv_sec == 0) {
501 sk->sk_stamp = ktime_get_real();
502 ts = ktime_to_timespec(sk->sk_stamp);
503 }
504 err = 0;
505 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
506 put_user(ts.tv_nsec, &ctv->tv_nsec))
507 err = -EFAULT;
508 return err;
509 }
510 EXPORT_SYMBOL(compat_sock_get_timestampns);
511
512 static int __compat_sys_getsockopt(int fd, int level, int optname,
513 char __user *optval,
514 int __user *optlen)
515 {
516 int err;
517 struct socket *sock = sockfd_lookup(fd, &err);
518
519 if (sock) {
520 err = security_socket_getsockopt(sock, level, optname);
521 if (err) {
522 sockfd_put(sock);
523 return err;
524 }
525
526 if (level == SOL_SOCKET)
527 err = compat_sock_getsockopt(sock, level,
528 optname, optval, optlen);
529 else if (sock->ops->compat_getsockopt)
530 err = sock->ops->compat_getsockopt(sock, level,
531 optname, optval, optlen);
532 else
533 err = sock->ops->getsockopt(sock, level,
534 optname, optval, optlen);
535 sockfd_put(sock);
536 }
537 return err;
538 }
539
540 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
541 char __user *, optval, int __user *, optlen)
542 {
543 return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
544 }
545
546 struct compat_group_req {
547 __u32 gr_interface;
548 struct __kernel_sockaddr_storage gr_group
549 __aligned(4);
550 } __packed;
551
552 struct compat_group_source_req {
553 __u32 gsr_interface;
554 struct __kernel_sockaddr_storage gsr_group
555 __aligned(4);
556 struct __kernel_sockaddr_storage gsr_source
557 __aligned(4);
558 } __packed;
559
560 struct compat_group_filter {
561 __u32 gf_interface;
562 struct __kernel_sockaddr_storage gf_group
563 __aligned(4);
564 __u32 gf_fmode;
565 __u32 gf_numsrc;
566 struct __kernel_sockaddr_storage gf_slist[1]
567 __aligned(4);
568 } __packed;
569
570 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
571 sizeof(struct __kernel_sockaddr_storage))
572
573
574 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
575 char __user *optval, unsigned int optlen,
576 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
577 {
578 char __user *koptval = optval;
579 int koptlen = optlen;
580
581 switch (optname) {
582 case MCAST_JOIN_GROUP:
583 case MCAST_LEAVE_GROUP:
584 {
585 struct compat_group_req __user *gr32 = (void *)optval;
586 struct group_req __user *kgr =
587 compat_alloc_user_space(sizeof(struct group_req));
588 u32 interface;
589
590 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
591 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
592 __get_user(interface, &gr32->gr_interface) ||
593 __put_user(interface, &kgr->gr_interface) ||
594 copy_in_user(&kgr->gr_group, &gr32->gr_group,
595 sizeof(kgr->gr_group)))
596 return -EFAULT;
597 koptval = (char __user *)kgr;
598 koptlen = sizeof(struct group_req);
599 break;
600 }
601 case MCAST_JOIN_SOURCE_GROUP:
602 case MCAST_LEAVE_SOURCE_GROUP:
603 case MCAST_BLOCK_SOURCE:
604 case MCAST_UNBLOCK_SOURCE:
605 {
606 struct compat_group_source_req __user *gsr32 = (void *)optval;
607 struct group_source_req __user *kgsr = compat_alloc_user_space(
608 sizeof(struct group_source_req));
609 u32 interface;
610
611 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
612 !access_ok(VERIFY_WRITE, kgsr,
613 sizeof(struct group_source_req)) ||
614 __get_user(interface, &gsr32->gsr_interface) ||
615 __put_user(interface, &kgsr->gsr_interface) ||
616 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
617 sizeof(kgsr->gsr_group)) ||
618 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
619 sizeof(kgsr->gsr_source)))
620 return -EFAULT;
621 koptval = (char __user *)kgsr;
622 koptlen = sizeof(struct group_source_req);
623 break;
624 }
625 case MCAST_MSFILTER:
626 {
627 struct compat_group_filter __user *gf32 = (void *)optval;
628 struct group_filter __user *kgf;
629 u32 interface, fmode, numsrc;
630
631 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
632 __get_user(interface, &gf32->gf_interface) ||
633 __get_user(fmode, &gf32->gf_fmode) ||
634 __get_user(numsrc, &gf32->gf_numsrc))
635 return -EFAULT;
636 koptlen = optlen + sizeof(struct group_filter) -
637 sizeof(struct compat_group_filter);
638 if (koptlen < GROUP_FILTER_SIZE(numsrc))
639 return -EINVAL;
640 kgf = compat_alloc_user_space(koptlen);
641 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
642 __put_user(interface, &kgf->gf_interface) ||
643 __put_user(fmode, &kgf->gf_fmode) ||
644 __put_user(numsrc, &kgf->gf_numsrc) ||
645 copy_in_user(&kgf->gf_group, &gf32->gf_group,
646 sizeof(kgf->gf_group)) ||
647 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
648 numsrc * sizeof(kgf->gf_slist[0]))))
649 return -EFAULT;
650 koptval = (char __user *)kgf;
651 break;
652 }
653
654 default:
655 break;
656 }
657 return setsockopt(sock, level, optname, koptval, koptlen);
658 }
659 EXPORT_SYMBOL(compat_mc_setsockopt);
660
661 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
662 char __user *optval, int __user *optlen,
663 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
664 {
665 struct compat_group_filter __user *gf32 = (void *)optval;
666 struct group_filter __user *kgf;
667 int __user *koptlen;
668 u32 interface, fmode, numsrc;
669 int klen, ulen, err;
670
671 if (optname != MCAST_MSFILTER)
672 return getsockopt(sock, level, optname, optval, optlen);
673
674 koptlen = compat_alloc_user_space(sizeof(*koptlen));
675 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
676 __get_user(ulen, optlen))
677 return -EFAULT;
678
679 /* adjust len for pad */
680 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
681
682 if (klen < GROUP_FILTER_SIZE(0))
683 return -EINVAL;
684
685 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
686 __put_user(klen, koptlen))
687 return -EFAULT;
688
689 /* have to allow space for previous compat_alloc_user_space, too */
690 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
691
692 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
693 __get_user(interface, &gf32->gf_interface) ||
694 __get_user(fmode, &gf32->gf_fmode) ||
695 __get_user(numsrc, &gf32->gf_numsrc) ||
696 __put_user(interface, &kgf->gf_interface) ||
697 __put_user(fmode, &kgf->gf_fmode) ||
698 __put_user(numsrc, &kgf->gf_numsrc) ||
699 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
700 return -EFAULT;
701
702 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
703 if (err)
704 return err;
705
706 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
707 __get_user(klen, koptlen))
708 return -EFAULT;
709
710 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
711
712 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
713 __put_user(ulen, optlen))
714 return -EFAULT;
715
716 if (!access_ok(VERIFY_READ, kgf, klen) ||
717 !access_ok(VERIFY_WRITE, gf32, ulen) ||
718 __get_user(interface, &kgf->gf_interface) ||
719 __get_user(fmode, &kgf->gf_fmode) ||
720 __get_user(numsrc, &kgf->gf_numsrc) ||
721 __put_user(interface, &gf32->gf_interface) ||
722 __put_user(fmode, &gf32->gf_fmode) ||
723 __put_user(numsrc, &gf32->gf_numsrc))
724 return -EFAULT;
725 if (numsrc) {
726 int copylen;
727
728 klen -= GROUP_FILTER_SIZE(0);
729 copylen = numsrc * sizeof(gf32->gf_slist[0]);
730 if (copylen > klen)
731 copylen = klen;
732 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
733 return -EFAULT;
734 }
735 return err;
736 }
737 EXPORT_SYMBOL(compat_mc_getsockopt);
738
739
740 /* Argument list sizes for compat_sys_socketcall */
741 #define AL(x) ((x) * sizeof(u32))
742 static unsigned char nas[21] = {
743 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
744 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
745 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
746 AL(4), AL(5), AL(4)
747 };
748 #undef AL
749
750 static inline long __compat_sys_sendmsg(int fd,
751 struct compat_msghdr __user *msg,
752 unsigned int flags)
753 {
754 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
755 flags | MSG_CMSG_COMPAT, false);
756 }
757
758 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
759 unsigned int, flags)
760 {
761 return __compat_sys_sendmsg(fd, msg, flags);
762 }
763
764 static inline long __compat_sys_sendmmsg(int fd,
765 struct compat_mmsghdr __user *mmsg,
766 unsigned int vlen, unsigned int flags)
767 {
768 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
769 flags | MSG_CMSG_COMPAT, false);
770 }
771
772 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
773 unsigned int, vlen, unsigned int, flags)
774 {
775 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
776 }
777
778 static inline long __compat_sys_recvmsg(int fd,
779 struct compat_msghdr __user *msg,
780 unsigned int flags)
781 {
782 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
783 flags | MSG_CMSG_COMPAT, false);
784 }
785
786 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
787 unsigned int, flags)
788 {
789 return __compat_sys_recvmsg(fd, msg, flags);
790 }
791
792 static inline long __compat_sys_recvfrom(int fd, void __user *buf,
793 compat_size_t len, unsigned int flags,
794 struct sockaddr __user *addr,
795 int __user *addrlen)
796 {
797 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
798 addrlen);
799 }
800
801 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
802 {
803 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
804 }
805
806 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
807 unsigned int, flags, struct sockaddr __user *, addr,
808 int __user *, addrlen)
809 {
810 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
811 }
812
813 static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
814 unsigned int vlen, unsigned int flags,
815 struct compat_timespec __user *timeout)
816 {
817 int datagrams;
818 struct timespec ktspec;
819
820 if (timeout == NULL)
821 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
822 flags | MSG_CMSG_COMPAT, NULL);
823
824 if (compat_get_timespec(&ktspec, timeout))
825 return -EFAULT;
826
827 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
828 flags | MSG_CMSG_COMPAT, &ktspec);
829 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
830 datagrams = -EFAULT;
831
832 return datagrams;
833 }
834
835 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
836 unsigned int, vlen, unsigned int, flags,
837 struct compat_timespec __user *, timeout)
838 {
839 return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
840 }
841
842 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
843 {
844 u32 a[AUDITSC_ARGS];
845 unsigned int len;
846 u32 a0, a1;
847 int ret;
848
849 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
850 return -EINVAL;
851 len = nas[call];
852 if (len > sizeof(a))
853 return -EINVAL;
854
855 if (copy_from_user(a, args, len))
856 return -EFAULT;
857
858 ret = audit_socketcall_compat(len / sizeof(a[0]), a);
859 if (ret)
860 return ret;
861
862 a0 = a[0];
863 a1 = a[1];
864
865 switch (call) {
866 case SYS_SOCKET:
867 ret = __sys_socket(a0, a1, a[2]);
868 break;
869 case SYS_BIND:
870 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
871 break;
872 case SYS_CONNECT:
873 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
874 break;
875 case SYS_LISTEN:
876 ret = __sys_listen(a0, a1);
877 break;
878 case SYS_ACCEPT:
879 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
880 break;
881 case SYS_GETSOCKNAME:
882 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
883 break;
884 case SYS_GETPEERNAME:
885 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
886 break;
887 case SYS_SOCKETPAIR:
888 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
889 break;
890 case SYS_SEND:
891 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
892 break;
893 case SYS_SENDTO:
894 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
895 compat_ptr(a[4]), a[5]);
896 break;
897 case SYS_RECV:
898 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
899 NULL, NULL);
900 break;
901 case SYS_RECVFROM:
902 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
903 compat_ptr(a[4]),
904 compat_ptr(a[5]));
905 break;
906 case SYS_SHUTDOWN:
907 ret = __sys_shutdown(a0, a1);
908 break;
909 case SYS_SETSOCKOPT:
910 ret = __compat_sys_setsockopt(a0, a1, a[2],
911 compat_ptr(a[3]), a[4]);
912 break;
913 case SYS_GETSOCKOPT:
914 ret = __compat_sys_getsockopt(a0, a1, a[2],
915 compat_ptr(a[3]),
916 compat_ptr(a[4]));
917 break;
918 case SYS_SENDMSG:
919 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
920 break;
921 case SYS_SENDMMSG:
922 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
923 break;
924 case SYS_RECVMSG:
925 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
926 break;
927 case SYS_RECVMMSG:
928 ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
929 compat_ptr(a[4]));
930 break;
931 case SYS_ACCEPT4:
932 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
933 break;
934 default:
935 ret = -EINVAL;
936 break;
937 }
938 return ret;
939 }
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