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ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS
[linux/fpc-iii.git] / net / compat.c
blob41724c9d32d53ecaea6d2a9e44e4acdeb8c195e7
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 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
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 *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 if (kern_msg->msg_name)
97 kern_msg->msg_name = kern_address;
98 } else
99 kern_msg->msg_name = NULL;
100
101 tot_len = iov_from_user_compat_to_kern(kern_iov,
102 (struct compat_iovec __user *)kern_msg->msg_iov,
103 kern_msg->msg_iovlen);
104 if (tot_len >= 0)
105 kern_msg->msg_iov = kern_iov;
106
107 return tot_len;
108 }
109
110 /* Bleech... */
111 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
112
113 #define CMSG_COMPAT_DATA(cmsg) \
114 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
115 #define CMSG_COMPAT_SPACE(len) \
116 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
117 #define CMSG_COMPAT_LEN(len) \
118 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
119
120 #define CMSG_COMPAT_FIRSTHDR(msg) \
121 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
122 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
123 (struct compat_cmsghdr __user *)NULL)
124
125 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
126 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
127 (ucmlen) <= (unsigned long) \
128 ((mhdr)->msg_controllen - \
129 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
130
131 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
132 struct compat_cmsghdr __user *cmsg, int cmsg_len)
133 {
134 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
135 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
136 msg->msg_controllen)
137 return NULL;
138 return (struct compat_cmsghdr __user *)ptr;
139 }
140
141 /* There is a lot of hair here because the alignment rules (and
142 * thus placement) of cmsg headers and length are different for
143 * 32-bit apps. -DaveM
144 */
145 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
146 unsigned char *stackbuf, int stackbuf_size)
147 {
148 struct compat_cmsghdr __user *ucmsg;
149 struct cmsghdr *kcmsg, *kcmsg_base;
150 compat_size_t ucmlen;
151 __kernel_size_t kcmlen, tmp;
152 int err = -EFAULT;
153
154 kcmlen = 0;
155 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
156 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
157 while (ucmsg != NULL) {
158 if (get_user(ucmlen, &ucmsg->cmsg_len))
159 return -EFAULT;
160
161 /* Catch bogons. */
162 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
163 return -EINVAL;
164
165 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
166 CMSG_ALIGN(sizeof(struct cmsghdr)));
167 tmp = CMSG_ALIGN(tmp);
168 kcmlen += tmp;
169 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
170 }
171 if (kcmlen == 0)
172 return -EINVAL;
173
174 /* The kcmlen holds the 64-bit version of the control length.
175 * It may not be modified as we do not stick it into the kmsg
176 * until we have successfully copied over all of the data
177 * from the user.
178 */
179 if (kcmlen > stackbuf_size)
180 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
181 if (kcmsg == NULL)
182 return -ENOBUFS;
183
184 /* Now copy them over neatly. */
185 memset(kcmsg, 0, kcmlen);
186 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
187 while (ucmsg != NULL) {
188 if (__get_user(ucmlen, &ucmsg->cmsg_len))
189 goto Efault;
190 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
191 goto Einval;
192 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
193 CMSG_ALIGN(sizeof(struct cmsghdr)));
194 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
195 goto Einval;
196 kcmsg->cmsg_len = tmp;
197 tmp = CMSG_ALIGN(tmp);
198 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
199 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
200 copy_from_user(CMSG_DATA(kcmsg),
201 CMSG_COMPAT_DATA(ucmsg),
202 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
203 goto Efault;
204
205 /* Advance. */
206 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
207 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
208 }
209
210 /* Ok, looks like we made it. Hook it up and return success. */
211 kmsg->msg_control = kcmsg_base;
212 kmsg->msg_controllen = kcmlen;
213 return 0;
214
215 Einval:
216 err = -EINVAL;
217 Efault:
218 if (kcmsg_base != (struct cmsghdr *)stackbuf)
219 sock_kfree_s(sk, kcmsg_base, kcmlen);
220 return err;
221 }
222
223 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
224 {
225 struct compat_timeval ctv;
226 struct compat_timespec cts[3];
227 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
228 struct compat_cmsghdr cmhdr;
229 int cmlen;
230
231 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
232 kmsg->msg_flags |= MSG_CTRUNC;
233 return 0; /* XXX: return error? check spec. */
234 }
235
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 cmlen = CMSG_COMPAT_LEN(len);
257 if (kmsg->msg_controllen < cmlen) {
258 kmsg->msg_flags |= MSG_CTRUNC;
259 cmlen = kmsg->msg_controllen;
260 }
261 cmhdr.cmsg_level = level;
262 cmhdr.cmsg_type = type;
263 cmhdr.cmsg_len = cmlen;
264
265 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
266 return -EFAULT;
267 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
268 return -EFAULT;
269 cmlen = CMSG_COMPAT_SPACE(len);
270 if (kmsg->msg_controllen < cmlen)
271 cmlen = kmsg->msg_controllen;
272 kmsg->msg_control += cmlen;
273 kmsg->msg_controllen -= cmlen;
274 return 0;
275 }
276
277 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
278 {
279 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
280 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
281 int fdnum = scm->fp->count;
282 struct file **fp = scm->fp->fp;
283 int __user *cmfptr;
284 int err = 0, i;
285
286 if (fdnum < fdmax)
287 fdmax = fdnum;
288
289 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
290 int new_fd;
291 err = security_file_receive(fp[i]);
292 if (err)
293 break;
294 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
295 ? O_CLOEXEC : 0);
296 if (err < 0)
297 break;
298 new_fd = err;
299 err = put_user(new_fd, cmfptr);
300 if (err) {
301 put_unused_fd(new_fd);
302 break;
303 }
304 /* Bump the usage count and install the file. */
305 get_file(fp[i]);
306 fd_install(new_fd, 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 /*
333 * A struct sock_filter is architecture independent.
334 */
335 struct compat_sock_fprog {
336 u16 len;
337 compat_uptr_t filter; /* struct sock_filter * */
338 };
339
340 static int do_set_attach_filter(struct socket *sock, int level, int optname,
341 char __user *optval, unsigned int optlen)
342 {
343 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
344 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
345 compat_uptr_t ptr;
346 u16 len;
347
348 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
349 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
350 __get_user(len, &fprog32->len) ||
351 __get_user(ptr, &fprog32->filter) ||
352 __put_user(len, &kfprog->len) ||
353 __put_user(compat_ptr(ptr), &kfprog->filter))
354 return -EFAULT;
355
356 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
357 sizeof(struct sock_fprog));
358 }
359
360 static int do_set_sock_timeout(struct socket *sock, int level,
361 int optname, char __user *optval, unsigned int optlen)
362 {
363 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
364 struct timeval ktime;
365 mm_segment_t old_fs;
366 int err;
367
368 if (optlen < sizeof(*up))
369 return -EINVAL;
370 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
371 __get_user(ktime.tv_sec, &up->tv_sec) ||
372 __get_user(ktime.tv_usec, &up->tv_usec))
373 return -EFAULT;
374 old_fs = get_fs();
375 set_fs(KERNEL_DS);
376 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
377 set_fs(old_fs);
378
379 return err;
380 }
381
382 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
383 char __user *optval, unsigned int optlen)
384 {
385 if (optname == SO_ATTACH_FILTER)
386 return do_set_attach_filter(sock, level, optname,
387 optval, optlen);
388 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
389 return do_set_sock_timeout(sock, level, optname, optval, optlen);
390
391 return sock_setsockopt(sock, level, optname, optval, optlen);
392 }
393
394 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
395 char __user *optval, unsigned int optlen)
396 {
397 int err;
398 struct socket *sock = sockfd_lookup(fd, &err);
399
400 if (sock) {
401 err = security_socket_setsockopt(sock, level, optname);
402 if (err) {
403 sockfd_put(sock);
404 return err;
405 }
406
407 if (level == SOL_SOCKET)
408 err = compat_sock_setsockopt(sock, level,
409 optname, optval, optlen);
410 else if (sock->ops->compat_setsockopt)
411 err = sock->ops->compat_setsockopt(sock, level,
412 optname, optval, optlen);
413 else
414 err = sock->ops->setsockopt(sock, level,
415 optname, optval, optlen);
416 sockfd_put(sock);
417 }
418 return err;
419 }
420
421 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
422 char __user *optval, int __user *optlen)
423 {
424 struct compat_timeval __user *up;
425 struct timeval ktime;
426 mm_segment_t old_fs;
427 int len, err;
428
429 up = (struct compat_timeval __user *) optval;
430 if (get_user(len, optlen))
431 return -EFAULT;
432 if (len < sizeof(*up))
433 return -EINVAL;
434 len = sizeof(ktime);
435 old_fs = get_fs();
436 set_fs(KERNEL_DS);
437 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
438 set_fs(old_fs);
439
440 if (!err) {
441 if (put_user(sizeof(*up), optlen) ||
442 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
443 __put_user(ktime.tv_sec, &up->tv_sec) ||
444 __put_user(ktime.tv_usec, &up->tv_usec))
445 err = -EFAULT;
446 }
447 return err;
448 }
449
450 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
451 char __user *optval, int __user *optlen)
452 {
453 if (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 (struct compat_timeval __user *) userstamp;
462 int err = -ENOENT;
463 struct timeval tv;
464
465 if (!sock_flag(sk, SOCK_TIMESTAMP))
466 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
467 tv = ktime_to_timeval(sk->sk_stamp);
468 if (tv.tv_sec == -1)
469 return err;
470 if (tv.tv_sec == 0) {
471 sk->sk_stamp = ktime_get_real();
472 tv = ktime_to_timeval(sk->sk_stamp);
473 }
474 err = 0;
475 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
476 put_user(tv.tv_usec, &ctv->tv_usec))
477 err = -EFAULT;
478 return err;
479 }
480 EXPORT_SYMBOL(compat_sock_get_timestamp);
481
482 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
483 {
484 struct compat_timespec __user *ctv =
485 (struct compat_timespec __user *) userstamp;
486 int err = -ENOENT;
487 struct timespec ts;
488
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 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 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 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 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 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 (timeout == NULL)
783 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
784 flags | MSG_CMSG_COMPAT, NULL);
785
786 if (get_compat_timespec(&ktspec, timeout))
787 return -EFAULT;
788
789 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
790 flags | MSG_CMSG_COMPAT, &ktspec);
791 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
792 datagrams = -EFAULT;
793
794 return datagrams;
795 }
796
797 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
798 {
799 int ret;
800 u32 a[6];
801 u32 a0, a1;
802
803 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
804 return -EINVAL;
805 if (copy_from_user(a, args, nas[call]))
806 return -EFAULT;
807 a0 = a[0];
808 a1 = a[1];
809
810 switch (call) {
811 case SYS_SOCKET:
812 ret = sys_socket(a0, a1, a[2]);
813 break;
814 case SYS_BIND:
815 ret = sys_bind(a0, compat_ptr(a1), a[2]);
816 break;
817 case SYS_CONNECT:
818 ret = sys_connect(a0, compat_ptr(a1), a[2]);
819 break;
820 case SYS_LISTEN:
821 ret = sys_listen(a0, a1);
822 break;
823 case SYS_ACCEPT:
824 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
825 break;
826 case SYS_GETSOCKNAME:
827 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
828 break;
829 case SYS_GETPEERNAME:
830 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
831 break;
832 case SYS_SOCKETPAIR:
833 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
834 break;
835 case SYS_SEND:
836 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
837 break;
838 case SYS_SENDTO:
839 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
840 break;
841 case SYS_RECV:
842 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
843 break;
844 case SYS_RECVFROM:
845 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
846 compat_ptr(a[4]), compat_ptr(a[5]));
847 break;
848 case SYS_SHUTDOWN:
849 ret = sys_shutdown(a0, a1);
850 break;
851 case SYS_SETSOCKOPT:
852 ret = compat_sys_setsockopt(a0, a1, a[2],
853 compat_ptr(a[3]), a[4]);
854 break;
855 case SYS_GETSOCKOPT:
856 ret = compat_sys_getsockopt(a0, a1, a[2],
857 compat_ptr(a[3]), compat_ptr(a[4]));
858 break;
859 case SYS_SENDMSG:
860 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
861 break;
862 case SYS_SENDMMSG:
863 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
864 break;
865 case SYS_RECVMSG:
866 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
867 break;
868 case SYS_RECVMMSG:
869 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
870 compat_ptr(a[4]));
871 break;
872 case SYS_ACCEPT4:
873 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
874 break;
875 default:
876 ret = -EINVAL;
877 break;
878 }
879 return ret;
880 }
Linux with added FPC-III support