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net: only use a single page of slop in MAX_SKB_FRAGS
[linux-2.6.git] / net / compat.c
blob6def90e0a1124b6772c480d099e7f6a505ba82f8
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 kmsg->msg_name = compat_ptr(tmp1);
75 kmsg->msg_iov = compat_ptr(tmp2);
76 kmsg->msg_control = compat_ptr(tmp3);
77 return 0;
78 }
79
80 /* I've named the args so it is easy to tell whose space the pointers are in. */
81 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
82 struct sockaddr *kern_address, int mode)
83 {
84 int tot_len;
85
86 if (kern_msg->msg_namelen) {
87 if (mode == VERIFY_READ) {
88 int err = move_addr_to_kernel(kern_msg->msg_name,
89 kern_msg->msg_namelen,
90 kern_address);
91 if (err < 0)
92 return err;
93 }
94 kern_msg->msg_name = kern_address;
95 } else
96 kern_msg->msg_name = NULL;
97
98 tot_len = iov_from_user_compat_to_kern(kern_iov,
99 (struct compat_iovec __user *)kern_msg->msg_iov,
100 kern_msg->msg_iovlen);
101 if (tot_len >= 0)
102 kern_msg->msg_iov = kern_iov;
103
104 return tot_len;
105 }
106
107 /* Bleech... */
108 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
109
110 #define CMSG_COMPAT_DATA(cmsg) \
111 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
112 #define CMSG_COMPAT_SPACE(len) \
113 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
114 #define CMSG_COMPAT_LEN(len) \
115 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
116
117 #define CMSG_COMPAT_FIRSTHDR(msg) \
118 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
119 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
120 (struct compat_cmsghdr __user *)NULL)
121
122 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
123 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
124 (ucmlen) <= (unsigned long) \
125 ((mhdr)->msg_controllen - \
126 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
127
128 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
129 struct compat_cmsghdr __user *cmsg, int cmsg_len)
130 {
131 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
132 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
133 msg->msg_controllen)
134 return NULL;
135 return (struct compat_cmsghdr __user *)ptr;
136 }
137
138 /* There is a lot of hair here because the alignment rules (and
139 * thus placement) of cmsg headers and length are different for
140 * 32-bit apps. -DaveM
141 */
142 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
143 unsigned char *stackbuf, int stackbuf_size)
144 {
145 struct compat_cmsghdr __user *ucmsg;
146 struct cmsghdr *kcmsg, *kcmsg_base;
147 compat_size_t ucmlen;
148 __kernel_size_t kcmlen, tmp;
149 int err = -EFAULT;
150
151 kcmlen = 0;
152 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
153 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
154 while (ucmsg != NULL) {
155 if (get_user(ucmlen, &ucmsg->cmsg_len))
156 return -EFAULT;
157
158 /* Catch bogons. */
159 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
160 return -EINVAL;
161
162 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
163 CMSG_ALIGN(sizeof(struct cmsghdr)));
164 tmp = CMSG_ALIGN(tmp);
165 kcmlen += tmp;
166 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
167 }
168 if (kcmlen == 0)
169 return -EINVAL;
170
171 /* The kcmlen holds the 64-bit version of the control length.
172 * It may not be modified as we do not stick it into the kmsg
173 * until we have successfully copied over all of the data
174 * from the user.
175 */
176 if (kcmlen > stackbuf_size)
177 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
178 if (kcmsg == NULL)
179 return -ENOBUFS;
180
181 /* Now copy them over neatly. */
182 memset(kcmsg, 0, kcmlen);
183 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
184 while (ucmsg != NULL) {
185 if (__get_user(ucmlen, &ucmsg->cmsg_len))
186 goto Efault;
187 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
188 goto Einval;
189 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
190 CMSG_ALIGN(sizeof(struct cmsghdr)));
191 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
192 goto Einval;
193 kcmsg->cmsg_len = tmp;
194 tmp = CMSG_ALIGN(tmp);
195 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
196 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
197 copy_from_user(CMSG_DATA(kcmsg),
198 CMSG_COMPAT_DATA(ucmsg),
199 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
200 goto Efault;
201
202 /* Advance. */
203 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
204 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
205 }
206
207 /* Ok, looks like we made it. Hook it up and return success. */
208 kmsg->msg_control = kcmsg_base;
209 kmsg->msg_controllen = kcmlen;
210 return 0;
211
212 Einval:
213 err = -EINVAL;
214 Efault:
215 if (kcmsg_base != (struct cmsghdr *)stackbuf)
216 sock_kfree_s(sk, kcmsg_base, kcmlen);
217 return err;
218 }
219
220 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
221 {
222 struct compat_timeval ctv;
223 struct compat_timespec cts[3];
224 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
225 struct compat_cmsghdr cmhdr;
226 int cmlen;
227
228 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
229 kmsg->msg_flags |= MSG_CTRUNC;
230 return 0; /* XXX: return error? check spec. */
231 }
232
233 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
234 struct timeval *tv = (struct timeval *)data;
235 ctv.tv_sec = tv->tv_sec;
236 ctv.tv_usec = tv->tv_usec;
237 data = &ctv;
238 len = sizeof(ctv);
239 }
240 if (level == SOL_SOCKET &&
241 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
242 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
243 int i;
244 struct timespec *ts = (struct timespec *)data;
245 for (i = 0; i < count; i++) {
246 cts[i].tv_sec = ts[i].tv_sec;
247 cts[i].tv_nsec = ts[i].tv_nsec;
248 }
249 data = &cts;
250 len = sizeof(cts[0]) * count;
251 }
252
253 cmlen = CMSG_COMPAT_LEN(len);
254 if (kmsg->msg_controllen < cmlen) {
255 kmsg->msg_flags |= MSG_CTRUNC;
256 cmlen = kmsg->msg_controllen;
257 }
258 cmhdr.cmsg_level = level;
259 cmhdr.cmsg_type = type;
260 cmhdr.cmsg_len = cmlen;
261
262 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
263 return -EFAULT;
264 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
265 return -EFAULT;
266 cmlen = CMSG_COMPAT_SPACE(len);
267 if (kmsg->msg_controllen < cmlen)
268 cmlen = kmsg->msg_controllen;
269 kmsg->msg_control += cmlen;
270 kmsg->msg_controllen -= cmlen;
271 return 0;
272 }
273
274 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
275 {
276 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
277 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
278 int fdnum = scm->fp->count;
279 struct file **fp = scm->fp->fp;
280 int __user *cmfptr;
281 int err = 0, i;
282
283 if (fdnum < fdmax)
284 fdmax = fdnum;
285
286 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
287 int new_fd;
288 err = security_file_receive(fp[i]);
289 if (err)
290 break;
291 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
292 ? O_CLOEXEC : 0);
293 if (err < 0)
294 break;
295 new_fd = err;
296 err = put_user(new_fd, cmfptr);
297 if (err) {
298 put_unused_fd(new_fd);
299 break;
300 }
301 /* Bump the usage count and install the file. */
302 get_file(fp[i]);
303 fd_install(new_fd, fp[i]);
304 }
305
306 if (i > 0) {
307 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
308 err = put_user(SOL_SOCKET, &cm->cmsg_level);
309 if (!err)
310 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
311 if (!err)
312 err = put_user(cmlen, &cm->cmsg_len);
313 if (!err) {
314 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
315 kmsg->msg_control += cmlen;
316 kmsg->msg_controllen -= cmlen;
317 }
318 }
319 if (i < fdnum)
320 kmsg->msg_flags |= MSG_CTRUNC;
321
322 /*
323 * All of the files that fit in the message have had their
324 * usage counts incremented, so we just free the list.
325 */
326 __scm_destroy(scm);
327 }
328
329 /*
330 * A struct sock_filter is architecture independent.
331 */
332 struct compat_sock_fprog {
333 u16 len;
334 compat_uptr_t filter; /* struct sock_filter * */
335 };
336
337 static int do_set_attach_filter(struct socket *sock, int level, int optname,
338 char __user *optval, unsigned int optlen)
339 {
340 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
341 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
342 compat_uptr_t ptr;
343 u16 len;
344
345 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
346 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
347 __get_user(len, &fprog32->len) ||
348 __get_user(ptr, &fprog32->filter) ||
349 __put_user(len, &kfprog->len) ||
350 __put_user(compat_ptr(ptr), &kfprog->filter))
351 return -EFAULT;
352
353 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
354 sizeof(struct sock_fprog));
355 }
356
357 static int do_set_sock_timeout(struct socket *sock, int level,
358 int optname, char __user *optval, unsigned int optlen)
359 {
360 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
361 struct timeval ktime;
362 mm_segment_t old_fs;
363 int err;
364
365 if (optlen < sizeof(*up))
366 return -EINVAL;
367 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
368 __get_user(ktime.tv_sec, &up->tv_sec) ||
369 __get_user(ktime.tv_usec, &up->tv_usec))
370 return -EFAULT;
371 old_fs = get_fs();
372 set_fs(KERNEL_DS);
373 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
374 set_fs(old_fs);
375
376 return err;
377 }
378
379 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
380 char __user *optval, unsigned int optlen)
381 {
382 if (optname == SO_ATTACH_FILTER)
383 return do_set_attach_filter(sock, level, optname,
384 optval, optlen);
385 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
386 return do_set_sock_timeout(sock, level, optname, optval, optlen);
387
388 return sock_setsockopt(sock, level, optname, optval, optlen);
389 }
390
391 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
392 char __user *optval, unsigned int optlen)
393 {
394 int err;
395 struct socket *sock = sockfd_lookup(fd, &err);
396
397 if (sock) {
398 err = security_socket_setsockopt(sock, level, optname);
399 if (err) {
400 sockfd_put(sock);
401 return err;
402 }
403
404 if (level == SOL_SOCKET)
405 err = compat_sock_setsockopt(sock, level,
406 optname, optval, optlen);
407 else if (sock->ops->compat_setsockopt)
408 err = sock->ops->compat_setsockopt(sock, level,
409 optname, optval, optlen);
410 else
411 err = sock->ops->setsockopt(sock, level,
412 optname, optval, optlen);
413 sockfd_put(sock);
414 }
415 return err;
416 }
417
418 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
419 char __user *optval, int __user *optlen)
420 {
421 struct compat_timeval __user *up;
422 struct timeval ktime;
423 mm_segment_t old_fs;
424 int len, err;
425
426 up = (struct compat_timeval __user *) optval;
427 if (get_user(len, optlen))
428 return -EFAULT;
429 if (len < sizeof(*up))
430 return -EINVAL;
431 len = sizeof(ktime);
432 old_fs = get_fs();
433 set_fs(KERNEL_DS);
434 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
435 set_fs(old_fs);
436
437 if (!err) {
438 if (put_user(sizeof(*up), optlen) ||
439 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
440 __put_user(ktime.tv_sec, &up->tv_sec) ||
441 __put_user(ktime.tv_usec, &up->tv_usec))
442 err = -EFAULT;
443 }
444 return err;
445 }
446
447 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
448 char __user *optval, int __user *optlen)
449 {
450 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
451 return do_get_sock_timeout(sock, level, optname, optval, optlen);
452 return sock_getsockopt(sock, level, optname, optval, optlen);
453 }
454
455 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
456 {
457 struct compat_timeval __user *ctv =
458 (struct compat_timeval __user *) userstamp;
459 int err = -ENOENT;
460 struct timeval tv;
461
462 if (!sock_flag(sk, SOCK_TIMESTAMP))
463 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
464 tv = ktime_to_timeval(sk->sk_stamp);
465 if (tv.tv_sec == -1)
466 return err;
467 if (tv.tv_sec == 0) {
468 sk->sk_stamp = ktime_get_real();
469 tv = ktime_to_timeval(sk->sk_stamp);
470 }
471 err = 0;
472 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
473 put_user(tv.tv_usec, &ctv->tv_usec))
474 err = -EFAULT;
475 return err;
476 }
477 EXPORT_SYMBOL(compat_sock_get_timestamp);
478
479 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
480 {
481 struct compat_timespec __user *ctv =
482 (struct compat_timespec __user *) userstamp;
483 int err = -ENOENT;
484 struct timespec ts;
485
486 if (!sock_flag(sk, SOCK_TIMESTAMP))
487 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
488 ts = ktime_to_timespec(sk->sk_stamp);
489 if (ts.tv_sec == -1)
490 return err;
491 if (ts.tv_sec == 0) {
492 sk->sk_stamp = ktime_get_real();
493 ts = ktime_to_timespec(sk->sk_stamp);
494 }
495 err = 0;
496 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
497 put_user(ts.tv_nsec, &ctv->tv_nsec))
498 err = -EFAULT;
499 return err;
500 }
501 EXPORT_SYMBOL(compat_sock_get_timestampns);
502
503 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
504 char __user *optval, int __user *optlen)
505 {
506 int err;
507 struct socket *sock = sockfd_lookup(fd, &err);
508
509 if (sock) {
510 err = security_socket_getsockopt(sock, level, optname);
511 if (err) {
512 sockfd_put(sock);
513 return err;
514 }
515
516 if (level == SOL_SOCKET)
517 err = compat_sock_getsockopt(sock, level,
518 optname, optval, optlen);
519 else if (sock->ops->compat_getsockopt)
520 err = sock->ops->compat_getsockopt(sock, level,
521 optname, optval, optlen);
522 else
523 err = sock->ops->getsockopt(sock, level,
524 optname, optval, optlen);
525 sockfd_put(sock);
526 }
527 return err;
528 }
529
530 struct compat_group_req {
531 __u32 gr_interface;
532 struct __kernel_sockaddr_storage gr_group
533 __attribute__ ((aligned(4)));
534 } __packed;
535
536 struct compat_group_source_req {
537 __u32 gsr_interface;
538 struct __kernel_sockaddr_storage gsr_group
539 __attribute__ ((aligned(4)));
540 struct __kernel_sockaddr_storage gsr_source
541 __attribute__ ((aligned(4)));
542 } __packed;
543
544 struct compat_group_filter {
545 __u32 gf_interface;
546 struct __kernel_sockaddr_storage gf_group
547 __attribute__ ((aligned(4)));
548 __u32 gf_fmode;
549 __u32 gf_numsrc;
550 struct __kernel_sockaddr_storage gf_slist[1]
551 __attribute__ ((aligned(4)));
552 } __packed;
553
554 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
555 sizeof(struct __kernel_sockaddr_storage))
556
557
558 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
559 char __user *optval, unsigned int optlen,
560 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
561 {
562 char __user *koptval = optval;
563 int koptlen = optlen;
564
565 switch (optname) {
566 case MCAST_JOIN_GROUP:
567 case MCAST_LEAVE_GROUP:
568 {
569 struct compat_group_req __user *gr32 = (void *)optval;
570 struct group_req __user *kgr =
571 compat_alloc_user_space(sizeof(struct group_req));
572 u32 interface;
573
574 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
575 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
576 __get_user(interface, &gr32->gr_interface) ||
577 __put_user(interface, &kgr->gr_interface) ||
578 copy_in_user(&kgr->gr_group, &gr32->gr_group,
579 sizeof(kgr->gr_group)))
580 return -EFAULT;
581 koptval = (char __user *)kgr;
582 koptlen = sizeof(struct group_req);
583 break;
584 }
585 case MCAST_JOIN_SOURCE_GROUP:
586 case MCAST_LEAVE_SOURCE_GROUP:
587 case MCAST_BLOCK_SOURCE:
588 case MCAST_UNBLOCK_SOURCE:
589 {
590 struct compat_group_source_req __user *gsr32 = (void *)optval;
591 struct group_source_req __user *kgsr = compat_alloc_user_space(
592 sizeof(struct group_source_req));
593 u32 interface;
594
595 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
596 !access_ok(VERIFY_WRITE, kgsr,
597 sizeof(struct group_source_req)) ||
598 __get_user(interface, &gsr32->gsr_interface) ||
599 __put_user(interface, &kgsr->gsr_interface) ||
600 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
601 sizeof(kgsr->gsr_group)) ||
602 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
603 sizeof(kgsr->gsr_source)))
604 return -EFAULT;
605 koptval = (char __user *)kgsr;
606 koptlen = sizeof(struct group_source_req);
607 break;
608 }
609 case MCAST_MSFILTER:
610 {
611 struct compat_group_filter __user *gf32 = (void *)optval;
612 struct group_filter __user *kgf;
613 u32 interface, fmode, numsrc;
614
615 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
616 __get_user(interface, &gf32->gf_interface) ||
617 __get_user(fmode, &gf32->gf_fmode) ||
618 __get_user(numsrc, &gf32->gf_numsrc))
619 return -EFAULT;
620 koptlen = optlen + sizeof(struct group_filter) -
621 sizeof(struct compat_group_filter);
622 if (koptlen < GROUP_FILTER_SIZE(numsrc))
623 return -EINVAL;
624 kgf = compat_alloc_user_space(koptlen);
625 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
626 __put_user(interface, &kgf->gf_interface) ||
627 __put_user(fmode, &kgf->gf_fmode) ||
628 __put_user(numsrc, &kgf->gf_numsrc) ||
629 copy_in_user(&kgf->gf_group, &gf32->gf_group,
630 sizeof(kgf->gf_group)) ||
631 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
632 numsrc * sizeof(kgf->gf_slist[0]))))
633 return -EFAULT;
634 koptval = (char __user *)kgf;
635 break;
636 }
637
638 default:
639 break;
640 }
641 return setsockopt(sock, level, optname, koptval, koptlen);
642 }
643 EXPORT_SYMBOL(compat_mc_setsockopt);
644
645 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
646 char __user *optval, int __user *optlen,
647 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
648 {
649 struct compat_group_filter __user *gf32 = (void *)optval;
650 struct group_filter __user *kgf;
651 int __user *koptlen;
652 u32 interface, fmode, numsrc;
653 int klen, ulen, err;
654
655 if (optname != MCAST_MSFILTER)
656 return getsockopt(sock, level, optname, optval, optlen);
657
658 koptlen = compat_alloc_user_space(sizeof(*koptlen));
659 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
660 __get_user(ulen, optlen))
661 return -EFAULT;
662
663 /* adjust len for pad */
664 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
665
666 if (klen < GROUP_FILTER_SIZE(0))
667 return -EINVAL;
668
669 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
670 __put_user(klen, koptlen))
671 return -EFAULT;
672
673 /* have to allow space for previous compat_alloc_user_space, too */
674 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
675
676 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
677 __get_user(interface, &gf32->gf_interface) ||
678 __get_user(fmode, &gf32->gf_fmode) ||
679 __get_user(numsrc, &gf32->gf_numsrc) ||
680 __put_user(interface, &kgf->gf_interface) ||
681 __put_user(fmode, &kgf->gf_fmode) ||
682 __put_user(numsrc, &kgf->gf_numsrc) ||
683 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
684 return -EFAULT;
685
686 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
687 if (err)
688 return err;
689
690 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
691 __get_user(klen, koptlen))
692 return -EFAULT;
693
694 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
695
696 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
697 __put_user(ulen, optlen))
698 return -EFAULT;
699
700 if (!access_ok(VERIFY_READ, kgf, klen) ||
701 !access_ok(VERIFY_WRITE, gf32, ulen) ||
702 __get_user(interface, &kgf->gf_interface) ||
703 __get_user(fmode, &kgf->gf_fmode) ||
704 __get_user(numsrc, &kgf->gf_numsrc) ||
705 __put_user(interface, &gf32->gf_interface) ||
706 __put_user(fmode, &gf32->gf_fmode) ||
707 __put_user(numsrc, &gf32->gf_numsrc))
708 return -EFAULT;
709 if (numsrc) {
710 int copylen;
711
712 klen -= GROUP_FILTER_SIZE(0);
713 copylen = numsrc * sizeof(gf32->gf_slist[0]);
714 if (copylen > klen)
715 copylen = klen;
716 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
717 return -EFAULT;
718 }
719 return err;
720 }
721 EXPORT_SYMBOL(compat_mc_getsockopt);
722
723
724 /* Argument list sizes for compat_sys_socketcall */
725 #define AL(x) ((x) * sizeof(u32))
726 static unsigned char nas[21] = {
727 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
728 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
729 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
730 AL(4), AL(5), AL(4)
731 };
732 #undef AL
733
734 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
735 {
736 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
737 }
738
739 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
740 unsigned vlen, unsigned int flags)
741 {
742 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
743 flags | MSG_CMSG_COMPAT);
744 }
745
746 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
747 {
748 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
749 }
750
751 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
752 {
753 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
754 }
755
756 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
757 unsigned flags, struct sockaddr __user *addr,
758 int __user *addrlen)
759 {
760 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
761 }
762
763 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
764 unsigned vlen, unsigned int flags,
765 struct compat_timespec __user *timeout)
766 {
767 int datagrams;
768 struct timespec ktspec;
769
770 if (timeout == NULL)
771 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
772 flags | MSG_CMSG_COMPAT, NULL);
773
774 if (get_compat_timespec(&ktspec, timeout))
775 return -EFAULT;
776
777 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
778 flags | MSG_CMSG_COMPAT, &ktspec);
779 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
780 datagrams = -EFAULT;
781
782 return datagrams;
783 }
784
785 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
786 {
787 int ret;
788 u32 a[6];
789 u32 a0, a1;
790
791 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
792 return -EINVAL;
793 if (copy_from_user(a, args, nas[call]))
794 return -EFAULT;
795 a0 = a[0];
796 a1 = a[1];
797
798 switch (call) {
799 case SYS_SOCKET:
800 ret = sys_socket(a0, a1, a[2]);
801 break;
802 case SYS_BIND:
803 ret = sys_bind(a0, compat_ptr(a1), a[2]);
804 break;
805 case SYS_CONNECT:
806 ret = sys_connect(a0, compat_ptr(a1), a[2]);
807 break;
808 case SYS_LISTEN:
809 ret = sys_listen(a0, a1);
810 break;
811 case SYS_ACCEPT:
812 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
813 break;
814 case SYS_GETSOCKNAME:
815 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
816 break;
817 case SYS_GETPEERNAME:
818 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
819 break;
820 case SYS_SOCKETPAIR:
821 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
822 break;
823 case SYS_SEND:
824 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
825 break;
826 case SYS_SENDTO:
827 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
828 break;
829 case SYS_RECV:
830 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
831 break;
832 case SYS_RECVFROM:
833 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
834 compat_ptr(a[4]), compat_ptr(a[5]));
835 break;
836 case SYS_SHUTDOWN:
837 ret = sys_shutdown(a0, a1);
838 break;
839 case SYS_SETSOCKOPT:
840 ret = compat_sys_setsockopt(a0, a1, a[2],
841 compat_ptr(a[3]), a[4]);
842 break;
843 case SYS_GETSOCKOPT:
844 ret = compat_sys_getsockopt(a0, a1, a[2],
845 compat_ptr(a[3]), compat_ptr(a[4]));
846 break;
847 case SYS_SENDMSG:
848 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
849 break;
850 case SYS_SENDMMSG:
851 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
852 break;
853 case SYS_RECVMSG:
854 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
855 break;
856 case SYS_RECVMMSG:
857 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
858 compat_ptr(a[4]));
859 break;
860 case SYS_ACCEPT4:
861 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
862 break;
863 default:
864 ret = -EINVAL;
865 break;
866 }
867 return ret;
868 }
Linus' kernel tree