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Net, USB, Option, hso: Do not dereference NULL pointer
[zen-stable.git] / net / compat.c
blob3649d58953615fea0c0e1d1b5ba8882632df7676
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
26 #include <net/scm.h>
27 #include <net/sock.h>
28 #include <net/ip.h>
29 #include <net/ipv6.h>
30 #include <asm/uaccess.h>
31 #include <net/compat.h>
32
33 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
34 struct compat_iovec __user *uiov32,
35 int niov)
36 {
37 int tot_len = 0;
38
39 while (niov > 0) {
40 compat_uptr_t buf;
41 compat_size_t len;
42
43 if (get_user(len, &uiov32->iov_len) ||
44 get_user(buf, &uiov32->iov_base))
45 return -EFAULT;
46
47 if (len > INT_MAX - tot_len)
48 len = INT_MAX - tot_len;
49
50 tot_len += len;
51 kiov->iov_base = compat_ptr(buf);
52 kiov->iov_len = (__kernel_size_t) len;
53 uiov32++;
54 kiov++;
55 niov--;
56 }
57 return tot_len;
58 }
59
60 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
61 {
62 compat_uptr_t tmp1, tmp2, tmp3;
63
64 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
65 __get_user(tmp1, &umsg->msg_name) ||
66 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
67 __get_user(tmp2, &umsg->msg_iov) ||
68 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
69 __get_user(tmp3, &umsg->msg_control) ||
70 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
71 __get_user(kmsg->msg_flags, &umsg->msg_flags))
72 return -EFAULT;
73 kmsg->msg_name = compat_ptr(tmp1);
74 kmsg->msg_iov = compat_ptr(tmp2);
75 kmsg->msg_control = compat_ptr(tmp3);
76 return 0;
77 }
78
79 /* I've named the args so it is easy to tell whose space the pointers are in. */
80 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
81 struct sockaddr *kern_address, int mode)
82 {
83 int tot_len;
84
85 if (kern_msg->msg_namelen) {
86 if (mode == VERIFY_READ) {
87 int err = move_addr_to_kernel(kern_msg->msg_name,
88 kern_msg->msg_namelen,
89 kern_address);
90 if (err < 0)
91 return err;
92 }
93 kern_msg->msg_name = kern_address;
94 } else
95 kern_msg->msg_name = NULL;
96
97 tot_len = iov_from_user_compat_to_kern(kern_iov,
98 (struct compat_iovec __user *)kern_msg->msg_iov,
99 kern_msg->msg_iovlen);
100 if (tot_len >= 0)
101 kern_msg->msg_iov = kern_iov;
102
103 return tot_len;
104 }
105
106 /* Bleech... */
107 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
108
109 #define CMSG_COMPAT_DATA(cmsg) \
110 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
111 #define CMSG_COMPAT_SPACE(len) \
112 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
113 #define CMSG_COMPAT_LEN(len) \
114 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
115
116 #define CMSG_COMPAT_FIRSTHDR(msg) \
117 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
118 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
119 (struct compat_cmsghdr __user *)NULL)
120
121 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
122 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
123 (ucmlen) <= (unsigned long) \
124 ((mhdr)->msg_controllen - \
125 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
126
127 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
128 struct compat_cmsghdr __user *cmsg, int cmsg_len)
129 {
130 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
131 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
132 msg->msg_controllen)
133 return NULL;
134 return (struct compat_cmsghdr __user *)ptr;
135 }
136
137 /* There is a lot of hair here because the alignment rules (and
138 * thus placement) of cmsg headers and length are different for
139 * 32-bit apps. -DaveM
140 */
141 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
142 unsigned char *stackbuf, int stackbuf_size)
143 {
144 struct compat_cmsghdr __user *ucmsg;
145 struct cmsghdr *kcmsg, *kcmsg_base;
146 compat_size_t ucmlen;
147 __kernel_size_t kcmlen, tmp;
148 int err = -EFAULT;
149
150 kcmlen = 0;
151 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
152 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
153 while (ucmsg != NULL) {
154 if (get_user(ucmlen, &ucmsg->cmsg_len))
155 return -EFAULT;
156
157 /* Catch bogons. */
158 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
159 return -EINVAL;
160
161 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
162 CMSG_ALIGN(sizeof(struct cmsghdr)));
163 tmp = CMSG_ALIGN(tmp);
164 kcmlen += tmp;
165 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
166 }
167 if (kcmlen == 0)
168 return -EINVAL;
169
170 /* The kcmlen holds the 64-bit version of the control length.
171 * It may not be modified as we do not stick it into the kmsg
172 * until we have successfully copied over all of the data
173 * from the user.
174 */
175 if (kcmlen > stackbuf_size)
176 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
177 if (kcmsg == NULL)
178 return -ENOBUFS;
179
180 /* Now copy them over neatly. */
181 memset(kcmsg, 0, kcmlen);
182 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
183 while (ucmsg != NULL) {
184 if (__get_user(ucmlen, &ucmsg->cmsg_len))
185 goto Efault;
186 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
187 goto Einval;
188 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
189 CMSG_ALIGN(sizeof(struct cmsghdr)));
190 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
191 goto Einval;
192 kcmsg->cmsg_len = tmp;
193 tmp = CMSG_ALIGN(tmp);
194 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
195 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
196 copy_from_user(CMSG_DATA(kcmsg),
197 CMSG_COMPAT_DATA(ucmsg),
198 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
199 goto Efault;
200
201 /* Advance. */
202 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
203 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
204 }
205
206 /* Ok, looks like we made it. Hook it up and return success. */
207 kmsg->msg_control = kcmsg_base;
208 kmsg->msg_controllen = kcmlen;
209 return 0;
210
211 Einval:
212 err = -EINVAL;
213 Efault:
214 if (kcmsg_base != (struct cmsghdr *)stackbuf)
215 sock_kfree_s(sk, kcmsg_base, kcmlen);
216 return err;
217 }
218
219 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
220 {
221 struct compat_timeval ctv;
222 struct compat_timespec cts[3];
223 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
224 struct compat_cmsghdr cmhdr;
225 int cmlen;
226
227 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
228 kmsg->msg_flags |= MSG_CTRUNC;
229 return 0; /* XXX: return error? check spec. */
230 }
231
232 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
233 struct timeval *tv = (struct timeval *)data;
234 ctv.tv_sec = tv->tv_sec;
235 ctv.tv_usec = tv->tv_usec;
236 data = &ctv;
237 len = sizeof(ctv);
238 }
239 if (level == SOL_SOCKET &&
240 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
241 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
242 int i;
243 struct timespec *ts = (struct timespec *)data;
244 for (i = 0; i < count; i++) {
245 cts[i].tv_sec = ts[i].tv_sec;
246 cts[i].tv_nsec = ts[i].tv_nsec;
247 }
248 data = &cts;
249 len = sizeof(cts[0]) * count;
250 }
251
252 cmlen = CMSG_COMPAT_LEN(len);
253 if (kmsg->msg_controllen < cmlen) {
254 kmsg->msg_flags |= MSG_CTRUNC;
255 cmlen = kmsg->msg_controllen;
256 }
257 cmhdr.cmsg_level = level;
258 cmhdr.cmsg_type = type;
259 cmhdr.cmsg_len = cmlen;
260
261 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
262 return -EFAULT;
263 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
264 return -EFAULT;
265 cmlen = CMSG_COMPAT_SPACE(len);
266 if (kmsg->msg_controllen < cmlen)
267 cmlen = kmsg->msg_controllen;
268 kmsg->msg_control += cmlen;
269 kmsg->msg_controllen -= cmlen;
270 return 0;
271 }
272
273 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
274 {
275 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
276 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
277 int fdnum = scm->fp->count;
278 struct file **fp = scm->fp->fp;
279 int __user *cmfptr;
280 int err = 0, i;
281
282 if (fdnum < fdmax)
283 fdmax = fdnum;
284
285 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
286 int new_fd;
287 err = security_file_receive(fp[i]);
288 if (err)
289 break;
290 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
291 ? O_CLOEXEC : 0);
292 if (err < 0)
293 break;
294 new_fd = err;
295 err = put_user(new_fd, cmfptr);
296 if (err) {
297 put_unused_fd(new_fd);
298 break;
299 }
300 /* Bump the usage count and install the file. */
301 get_file(fp[i]);
302 fd_install(new_fd, fp[i]);
303 }
304
305 if (i > 0) {
306 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
307 err = put_user(SOL_SOCKET, &cm->cmsg_level);
308 if (!err)
309 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
310 if (!err)
311 err = put_user(cmlen, &cm->cmsg_len);
312 if (!err) {
313 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
314 kmsg->msg_control += cmlen;
315 kmsg->msg_controllen -= cmlen;
316 }
317 }
318 if (i < fdnum)
319 kmsg->msg_flags |= MSG_CTRUNC;
320
321 /*
322 * All of the files that fit in the message have had their
323 * usage counts incremented, so we just free the list.
324 */
325 __scm_destroy(scm);
326 }
327
328 /*
329 * A struct sock_filter is architecture independent.
330 */
331 struct compat_sock_fprog {
332 u16 len;
333 compat_uptr_t filter; /* struct sock_filter * */
334 };
335
336 static int do_set_attach_filter(struct socket *sock, int level, int optname,
337 char __user *optval, unsigned int optlen)
338 {
339 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
340 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
341 compat_uptr_t ptr;
342 u16 len;
343
344 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
345 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
346 __get_user(len, &fprog32->len) ||
347 __get_user(ptr, &fprog32->filter) ||
348 __put_user(len, &kfprog->len) ||
349 __put_user(compat_ptr(ptr), &kfprog->filter))
350 return -EFAULT;
351
352 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
353 sizeof(struct sock_fprog));
354 }
355
356 static int do_set_sock_timeout(struct socket *sock, int level,
357 int optname, char __user *optval, unsigned int optlen)
358 {
359 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
360 struct timeval ktime;
361 mm_segment_t old_fs;
362 int err;
363
364 if (optlen < sizeof(*up))
365 return -EINVAL;
366 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
367 __get_user(ktime.tv_sec, &up->tv_sec) ||
368 __get_user(ktime.tv_usec, &up->tv_usec))
369 return -EFAULT;
370 old_fs = get_fs();
371 set_fs(KERNEL_DS);
372 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
373 set_fs(old_fs);
374
375 return err;
376 }
377
378 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
379 char __user *optval, unsigned int optlen)
380 {
381 if (optname == SO_ATTACH_FILTER)
382 return do_set_attach_filter(sock, level, optname,
383 optval, optlen);
384 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
385 return do_set_sock_timeout(sock, level, optname, optval, optlen);
386
387 return sock_setsockopt(sock, level, optname, optval, optlen);
388 }
389
390 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
391 char __user *optval, unsigned int optlen)
392 {
393 int err;
394 struct socket *sock = sockfd_lookup(fd, &err);
395
396 if (sock) {
397 err = security_socket_setsockopt(sock, level, optname);
398 if (err) {
399 sockfd_put(sock);
400 return err;
401 }
402
403 if (level == SOL_SOCKET)
404 err = compat_sock_setsockopt(sock, level,
405 optname, optval, optlen);
406 else if (sock->ops->compat_setsockopt)
407 err = sock->ops->compat_setsockopt(sock, level,
408 optname, optval, optlen);
409 else
410 err = sock->ops->setsockopt(sock, level,
411 optname, optval, optlen);
412 sockfd_put(sock);
413 }
414 return err;
415 }
416
417 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
418 char __user *optval, int __user *optlen)
419 {
420 struct compat_timeval __user *up;
421 struct timeval ktime;
422 mm_segment_t old_fs;
423 int len, err;
424
425 up = (struct compat_timeval __user *) optval;
426 if (get_user(len, optlen))
427 return -EFAULT;
428 if (len < sizeof(*up))
429 return -EINVAL;
430 len = sizeof(ktime);
431 old_fs = get_fs();
432 set_fs(KERNEL_DS);
433 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
434 set_fs(old_fs);
435
436 if (!err) {
437 if (put_user(sizeof(*up), optlen) ||
438 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
439 __put_user(ktime.tv_sec, &up->tv_sec) ||
440 __put_user(ktime.tv_usec, &up->tv_usec))
441 err = -EFAULT;
442 }
443 return err;
444 }
445
446 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
447 char __user *optval, int __user *optlen)
448 {
449 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
450 return do_get_sock_timeout(sock, level, optname, optval, optlen);
451 return sock_getsockopt(sock, level, optname, optval, optlen);
452 }
453
454 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
455 {
456 struct compat_timeval __user *ctv =
457 (struct compat_timeval __user *) userstamp;
458 int err = -ENOENT;
459 struct timeval tv;
460
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 (struct compat_timespec __user *) userstamp;
482 int err = -ENOENT;
483 struct timespec ts;
484
485 if (!sock_flag(sk, SOCK_TIMESTAMP))
486 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
487 ts = ktime_to_timespec(sk->sk_stamp);
488 if (ts.tv_sec == -1)
489 return err;
490 if (ts.tv_sec == 0) {
491 sk->sk_stamp = ktime_get_real();
492 ts = ktime_to_timespec(sk->sk_stamp);
493 }
494 err = 0;
495 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
496 put_user(ts.tv_nsec, &ctv->tv_nsec))
497 err = -EFAULT;
498 return err;
499 }
500 EXPORT_SYMBOL(compat_sock_get_timestampns);
501
502 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
503 char __user *optval, int __user *optlen)
504 {
505 int err;
506 struct socket *sock = sockfd_lookup(fd, &err);
507
508 if (sock) {
509 err = security_socket_getsockopt(sock, level, optname);
510 if (err) {
511 sockfd_put(sock);
512 return err;
513 }
514
515 if (level == SOL_SOCKET)
516 err = compat_sock_getsockopt(sock, level,
517 optname, optval, optlen);
518 else if (sock->ops->compat_getsockopt)
519 err = sock->ops->compat_getsockopt(sock, level,
520 optname, optval, optlen);
521 else
522 err = sock->ops->getsockopt(sock, level,
523 optname, optval, optlen);
524 sockfd_put(sock);
525 }
526 return err;
527 }
528
529 struct compat_group_req {
530 __u32 gr_interface;
531 struct __kernel_sockaddr_storage gr_group
532 __attribute__ ((aligned(4)));
533 } __packed;
534
535 struct compat_group_source_req {
536 __u32 gsr_interface;
537 struct __kernel_sockaddr_storage gsr_group
538 __attribute__ ((aligned(4)));
539 struct __kernel_sockaddr_storage gsr_source
540 __attribute__ ((aligned(4)));
541 } __packed;
542
543 struct compat_group_filter {
544 __u32 gf_interface;
545 struct __kernel_sockaddr_storage gf_group
546 __attribute__ ((aligned(4)));
547 __u32 gf_fmode;
548 __u32 gf_numsrc;
549 struct __kernel_sockaddr_storage gf_slist[1]
550 __attribute__ ((aligned(4)));
551 } __packed;
552
553 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
554 sizeof(struct __kernel_sockaddr_storage))
555
556
557 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
558 char __user *optval, unsigned int optlen,
559 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
560 {
561 char __user *koptval = optval;
562 int koptlen = optlen;
563
564 switch (optname) {
565 case MCAST_JOIN_GROUP:
566 case MCAST_LEAVE_GROUP:
567 {
568 struct compat_group_req __user *gr32 = (void *)optval;
569 struct group_req __user *kgr =
570 compat_alloc_user_space(sizeof(struct group_req));
571 u32 interface;
572
573 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
574 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
575 __get_user(interface, &gr32->gr_interface) ||
576 __put_user(interface, &kgr->gr_interface) ||
577 copy_in_user(&kgr->gr_group, &gr32->gr_group,
578 sizeof(kgr->gr_group)))
579 return -EFAULT;
580 koptval = (char __user *)kgr;
581 koptlen = sizeof(struct group_req);
582 break;
583 }
584 case MCAST_JOIN_SOURCE_GROUP:
585 case MCAST_LEAVE_SOURCE_GROUP:
586 case MCAST_BLOCK_SOURCE:
587 case MCAST_UNBLOCK_SOURCE:
588 {
589 struct compat_group_source_req __user *gsr32 = (void *)optval;
590 struct group_source_req __user *kgsr = compat_alloc_user_space(
591 sizeof(struct group_source_req));
592 u32 interface;
593
594 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
595 !access_ok(VERIFY_WRITE, kgsr,
596 sizeof(struct group_source_req)) ||
597 __get_user(interface, &gsr32->gsr_interface) ||
598 __put_user(interface, &kgsr->gsr_interface) ||
599 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
600 sizeof(kgsr->gsr_group)) ||
601 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
602 sizeof(kgsr->gsr_source)))
603 return -EFAULT;
604 koptval = (char __user *)kgsr;
605 koptlen = sizeof(struct group_source_req);
606 break;
607 }
608 case MCAST_MSFILTER:
609 {
610 struct compat_group_filter __user *gf32 = (void *)optval;
611 struct group_filter __user *kgf;
612 u32 interface, fmode, numsrc;
613
614 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
615 __get_user(interface, &gf32->gf_interface) ||
616 __get_user(fmode, &gf32->gf_fmode) ||
617 __get_user(numsrc, &gf32->gf_numsrc))
618 return -EFAULT;
619 koptlen = optlen + sizeof(struct group_filter) -
620 sizeof(struct compat_group_filter);
621 if (koptlen < GROUP_FILTER_SIZE(numsrc))
622 return -EINVAL;
623 kgf = compat_alloc_user_space(koptlen);
624 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
625 __put_user(interface, &kgf->gf_interface) ||
626 __put_user(fmode, &kgf->gf_fmode) ||
627 __put_user(numsrc, &kgf->gf_numsrc) ||
628 copy_in_user(&kgf->gf_group, &gf32->gf_group,
629 sizeof(kgf->gf_group)) ||
630 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
631 numsrc * sizeof(kgf->gf_slist[0]))))
632 return -EFAULT;
633 koptval = (char __user *)kgf;
634 break;
635 }
636
637 default:
638 break;
639 }
640 return setsockopt(sock, level, optname, koptval, koptlen);
641 }
642 EXPORT_SYMBOL(compat_mc_setsockopt);
643
644 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
645 char __user *optval, int __user *optlen,
646 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
647 {
648 struct compat_group_filter __user *gf32 = (void *)optval;
649 struct group_filter __user *kgf;
650 int __user *koptlen;
651 u32 interface, fmode, numsrc;
652 int klen, ulen, err;
653
654 if (optname != MCAST_MSFILTER)
655 return getsockopt(sock, level, optname, optval, optlen);
656
657 koptlen = compat_alloc_user_space(sizeof(*koptlen));
658 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
659 __get_user(ulen, optlen))
660 return -EFAULT;
661
662 /* adjust len for pad */
663 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
664
665 if (klen < GROUP_FILTER_SIZE(0))
666 return -EINVAL;
667
668 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
669 __put_user(klen, koptlen))
670 return -EFAULT;
671
672 /* have to allow space for previous compat_alloc_user_space, too */
673 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
674
675 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
676 __get_user(interface, &gf32->gf_interface) ||
677 __get_user(fmode, &gf32->gf_fmode) ||
678 __get_user(numsrc, &gf32->gf_numsrc) ||
679 __put_user(interface, &kgf->gf_interface) ||
680 __put_user(fmode, &kgf->gf_fmode) ||
681 __put_user(numsrc, &kgf->gf_numsrc) ||
682 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
683 return -EFAULT;
684
685 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
686 if (err)
687 return err;
688
689 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
690 __get_user(klen, koptlen))
691 return -EFAULT;
692
693 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
694
695 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
696 __put_user(ulen, optlen))
697 return -EFAULT;
698
699 if (!access_ok(VERIFY_READ, kgf, klen) ||
700 !access_ok(VERIFY_WRITE, gf32, ulen) ||
701 __get_user(interface, &kgf->gf_interface) ||
702 __get_user(fmode, &kgf->gf_fmode) ||
703 __get_user(numsrc, &kgf->gf_numsrc) ||
704 __put_user(interface, &gf32->gf_interface) ||
705 __put_user(fmode, &gf32->gf_fmode) ||
706 __put_user(numsrc, &gf32->gf_numsrc))
707 return -EFAULT;
708 if (numsrc) {
709 int copylen;
710
711 klen -= GROUP_FILTER_SIZE(0);
712 copylen = numsrc * sizeof(gf32->gf_slist[0]);
713 if (copylen > klen)
714 copylen = klen;
715 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
716 return -EFAULT;
717 }
718 return err;
719 }
720 EXPORT_SYMBOL(compat_mc_getsockopt);
721
722
723 /* Argument list sizes for compat_sys_socketcall */
724 #define AL(x) ((x) * sizeof(u32))
725 static unsigned char nas[20] = {
726 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
727 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
728 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
729 AL(4), AL(5)
730 };
731 #undef AL
732
733 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
734 {
735 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
736 }
737
738 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
739 {
740 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
741 }
742
743 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
744 {
745 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
746 }
747
748 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
749 unsigned flags, struct sockaddr __user *addr,
750 int __user *addrlen)
751 {
752 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
753 }
754
755 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
756 unsigned vlen, unsigned int flags,
757 struct compat_timespec __user *timeout)
758 {
759 int datagrams;
760 struct timespec ktspec;
761
762 if (timeout == NULL)
763 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
764 flags | MSG_CMSG_COMPAT, NULL);
765
766 if (get_compat_timespec(&ktspec, timeout))
767 return -EFAULT;
768
769 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
770 flags | MSG_CMSG_COMPAT, &ktspec);
771 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
772 datagrams = -EFAULT;
773
774 return datagrams;
775 }
776
777 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
778 {
779 int ret;
780 u32 a[6];
781 u32 a0, a1;
782
783 if (call < SYS_SOCKET || call > SYS_RECVMMSG)
784 return -EINVAL;
785 if (copy_from_user(a, args, nas[call]))
786 return -EFAULT;
787 a0 = a[0];
788 a1 = a[1];
789
790 switch (call) {
791 case SYS_SOCKET:
792 ret = sys_socket(a0, a1, a[2]);
793 break;
794 case SYS_BIND:
795 ret = sys_bind(a0, compat_ptr(a1), a[2]);
796 break;
797 case SYS_CONNECT:
798 ret = sys_connect(a0, compat_ptr(a1), a[2]);
799 break;
800 case SYS_LISTEN:
801 ret = sys_listen(a0, a1);
802 break;
803 case SYS_ACCEPT:
804 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
805 break;
806 case SYS_GETSOCKNAME:
807 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
808 break;
809 case SYS_GETPEERNAME:
810 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
811 break;
812 case SYS_SOCKETPAIR:
813 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
814 break;
815 case SYS_SEND:
816 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
817 break;
818 case SYS_SENDTO:
819 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
820 break;
821 case SYS_RECV:
822 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
823 break;
824 case SYS_RECVFROM:
825 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
826 compat_ptr(a[4]), compat_ptr(a[5]));
827 break;
828 case SYS_SHUTDOWN:
829 ret = sys_shutdown(a0, a1);
830 break;
831 case SYS_SETSOCKOPT:
832 ret = compat_sys_setsockopt(a0, a1, a[2],
833 compat_ptr(a[3]), a[4]);
834 break;
835 case SYS_GETSOCKOPT:
836 ret = compat_sys_getsockopt(a0, a1, a[2],
837 compat_ptr(a[3]), compat_ptr(a[4]));
838 break;
839 case SYS_SENDMSG:
840 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
841 break;
842 case SYS_RECVMSG:
843 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
844 break;
845 case SYS_RECVMMSG:
846 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
847 compat_ptr(a[4]));
848 break;
849 case SYS_ACCEPT4:
850 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
851 break;
852 default:
853 ret = -EINVAL;
854 break;
855 }
856 return ret;
857 }