xref: /openbmc/linux/net/compat.c (revision fd589a8f) 
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/fs.h>
16 #include <linux/types.h>
17 #include <linux/file.h>
18 #include <linux/icmpv6.h>
19 #include <linux/socket.h>
20 #include <linux/syscalls.h>
21 #include <linux/filter.h>
22 #include <linux/compat.h>
23 #include <linux/security.h>
24 
25 #include <net/scm.h>
26 #include <net/sock.h>
27 #include <net/ip.h>
28 #include <net/ipv6.h>
29 #include <asm/uaccess.h>
30 #include <net/compat.h>
31 
32 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
33 					  struct compat_iovec __user *uiov32,
34 					  int niov)
35 {
36 	int tot_len = 0;
37 
38 	while (niov > 0) {
39 		compat_uptr_t buf;
40 		compat_size_t len;
41 
42 		if (get_user(len, &uiov32->iov_len) ||
43 		   get_user(buf, &uiov32->iov_base)) {
44 			tot_len = -EFAULT;
45 			break;
46 		}
47 		tot_len += len;
48 		kiov->iov_base = compat_ptr(buf);
49 		kiov->iov_len = (__kernel_size_t) len;
50 		uiov32++;
51 		kiov++;
52 		niov--;
53 	}
54 	return tot_len;
55 }
56 
57 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
58 {
59 	compat_uptr_t tmp1, tmp2, tmp3;
60 
61 	if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
62 	    __get_user(tmp1, &umsg->msg_name) ||
63 	    __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
64 	    __get_user(tmp2, &umsg->msg_iov) ||
65 	    __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
66 	    __get_user(tmp3, &umsg->msg_control) ||
67 	    __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
68 	    __get_user(kmsg->msg_flags, &umsg->msg_flags))
69 		return -EFAULT;
70 	kmsg->msg_name = compat_ptr(tmp1);
71 	kmsg->msg_iov = compat_ptr(tmp2);
72 	kmsg->msg_control = compat_ptr(tmp3);
73 	return 0;
74 }
75 
76 /* I've named the args so it is easy to tell whose space the pointers are in. */
77 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
78 		   struct sockaddr *kern_address, int mode)
79 {
80 	int tot_len;
81 
82 	if (kern_msg->msg_namelen) {
83 		if (mode==VERIFY_READ) {
84 			int err = move_addr_to_kernel(kern_msg->msg_name,
85 						      kern_msg->msg_namelen,
86 						      kern_address);
87 			if (err < 0)
88 				return err;
89 		}
90 		kern_msg->msg_name = kern_address;
91 	} else
92 		kern_msg->msg_name = NULL;
93 
94 	tot_len = iov_from_user_compat_to_kern(kern_iov,
95 					  (struct compat_iovec __user *)kern_msg->msg_iov,
96 					  kern_msg->msg_iovlen);
97 	if (tot_len >= 0)
98 		kern_msg->msg_iov = kern_iov;
99 
100 	return tot_len;
101 }
102 
103 /* Bleech... */
104 #define CMSG_COMPAT_ALIGN(len)	ALIGN((len), sizeof(s32))
105 
106 #define CMSG_COMPAT_DATA(cmsg)				\
107 	((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
108 #define CMSG_COMPAT_SPACE(len)				\
109 	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
110 #define CMSG_COMPAT_LEN(len)				\
111 	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
112 
113 #define CMSG_COMPAT_FIRSTHDR(msg)			\
114 	(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?	\
115 	 (struct compat_cmsghdr __user *)((msg)->msg_control) :		\
116 	 (struct compat_cmsghdr __user *)NULL)
117 
118 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
119 	((ucmlen) >= sizeof(struct compat_cmsghdr) && \
120 	 (ucmlen) <= (unsigned long) \
121 	 ((mhdr)->msg_controllen - \
122 	  ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
123 
124 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
125 		struct compat_cmsghdr __user *cmsg, int cmsg_len)
126 {
127 	char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
128 	if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
129 			msg->msg_controllen)
130 		return NULL;
131 	return (struct compat_cmsghdr __user *)ptr;
132 }
133 
134 /* There is a lot of hair here because the alignment rules (and
135  * thus placement) of cmsg headers and length are different for
136  * 32-bit apps.  -DaveM
137  */
138 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
139 			       unsigned char *stackbuf, int stackbuf_size)
140 {
141 	struct compat_cmsghdr __user *ucmsg;
142 	struct cmsghdr *kcmsg, *kcmsg_base;
143 	compat_size_t ucmlen;
144 	__kernel_size_t kcmlen, tmp;
145 	int err = -EFAULT;
146 
147 	kcmlen = 0;
148 	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
149 	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
150 	while (ucmsg != NULL) {
151 		if (get_user(ucmlen, &ucmsg->cmsg_len))
152 			return -EFAULT;
153 
154 		/* Catch bogons. */
155 		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
156 			return -EINVAL;
157 
158 		tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
159 		       CMSG_ALIGN(sizeof(struct cmsghdr)));
160 		tmp = CMSG_ALIGN(tmp);
161 		kcmlen += tmp;
162 		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
163 	}
164 	if (kcmlen == 0)
165 		return -EINVAL;
166 
167 	/* The kcmlen holds the 64-bit version of the control length.
168 	 * It may not be modified as we do not stick it into the kmsg
169 	 * until we have successfully copied over all of the data
170 	 * from the user.
171 	 */
172 	if (kcmlen > stackbuf_size)
173 		kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
174 	if (kcmsg == NULL)
175 		return -ENOBUFS;
176 
177 	/* Now copy them over neatly. */
178 	memset(kcmsg, 0, kcmlen);
179 	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
180 	while (ucmsg != NULL) {
181 		if (__get_user(ucmlen, &ucmsg->cmsg_len))
182 			goto Efault;
183 		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
184 			goto Einval;
185 		tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
186 		       CMSG_ALIGN(sizeof(struct cmsghdr)));
187 		if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
188 			goto Einval;
189 		kcmsg->cmsg_len = tmp;
190 		tmp = CMSG_ALIGN(tmp);
191 		if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
192 		    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
193 		    copy_from_user(CMSG_DATA(kcmsg),
194 				   CMSG_COMPAT_DATA(ucmsg),
195 				   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
196 			goto Efault;
197 
198 		/* Advance. */
199 		kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
200 		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
201 	}
202 
203 	/* Ok, looks like we made it.  Hook it up and return success. */
204 	kmsg->msg_control = kcmsg_base;
205 	kmsg->msg_controllen = kcmlen;
206 	return 0;
207 
208 Einval:
209 	err = -EINVAL;
210 Efault:
211 	if (kcmsg_base != (struct cmsghdr *)stackbuf)
212 		sock_kfree_s(sk, kcmsg_base, kcmlen);
213 	return err;
214 }
215 
216 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
217 {
218 	struct compat_timeval ctv;
219 	struct compat_timespec cts[3];
220 	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
221 	struct compat_cmsghdr cmhdr;
222 	int cmlen;
223 
224 	if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
225 		kmsg->msg_flags |= MSG_CTRUNC;
226 		return 0; /* XXX: return error? check spec. */
227 	}
228 
229 	if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
230 		struct timeval *tv = (struct timeval *)data;
231 		ctv.tv_sec = tv->tv_sec;
232 		ctv.tv_usec = tv->tv_usec;
233 		data = &ctv;
234 		len = sizeof(ctv);
235 	}
236 	if (level == SOL_SOCKET &&
237 	    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
238 		int count = type == SCM_TIMESTAMPNS ? 1 : 3;
239 		int i;
240 		struct timespec *ts = (struct timespec *)data;
241 		for (i = 0; i < count; i++) {
242 			cts[i].tv_sec = ts[i].tv_sec;
243 			cts[i].tv_nsec = ts[i].tv_nsec;
244 		}
245 		data = &cts;
246 		len = sizeof(cts[0]) * count;
247 	}
248 
249 	cmlen = CMSG_COMPAT_LEN(len);
250 	if (kmsg->msg_controllen < cmlen) {
251 		kmsg->msg_flags |= MSG_CTRUNC;
252 		cmlen = kmsg->msg_controllen;
253 	}
254 	cmhdr.cmsg_level = level;
255 	cmhdr.cmsg_type = type;
256 	cmhdr.cmsg_len = cmlen;
257 
258 	if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
259 		return -EFAULT;
260 	if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
261 		return -EFAULT;
262 	cmlen = CMSG_COMPAT_SPACE(len);
263 	if (kmsg->msg_controllen < cmlen)
264 		cmlen = kmsg->msg_controllen;
265 	kmsg->msg_control += cmlen;
266 	kmsg->msg_controllen -= cmlen;
267 	return 0;
268 }
269 
270 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
271 {
272 	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
273 	int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
274 	int fdnum = scm->fp->count;
275 	struct file **fp = scm->fp->fp;
276 	int __user *cmfptr;
277 	int err = 0, i;
278 
279 	if (fdnum < fdmax)
280 		fdmax = fdnum;
281 
282 	for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
283 		int new_fd;
284 		err = security_file_receive(fp[i]);
285 		if (err)
286 			break;
287 		err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
288 					  ? O_CLOEXEC : 0);
289 		if (err < 0)
290 			break;
291 		new_fd = err;
292 		err = put_user(new_fd, cmfptr);
293 		if (err) {
294 			put_unused_fd(new_fd);
295 			break;
296 		}
297 		/* Bump the usage count and install the file. */
298 		get_file(fp[i]);
299 		fd_install(new_fd, fp[i]);
300 	}
301 
302 	if (i > 0) {
303 		int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
304 		err = put_user(SOL_SOCKET, &cm->cmsg_level);
305 		if (!err)
306 			err = put_user(SCM_RIGHTS, &cm->cmsg_type);
307 		if (!err)
308 			err = put_user(cmlen, &cm->cmsg_len);
309 		if (!err) {
310 			cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
311 			kmsg->msg_control += cmlen;
312 			kmsg->msg_controllen -= cmlen;
313 		}
314 	}
315 	if (i < fdnum)
316 		kmsg->msg_flags |= MSG_CTRUNC;
317 
318 	/*
319 	 * All of the files that fit in the message have had their
320 	 * usage counts incremented, so we just free the list.
321 	 */
322 	__scm_destroy(scm);
323 }
324 
325 /*
326  * A struct sock_filter is architecture independent.
327  */
328 struct compat_sock_fprog {
329 	u16		len;
330 	compat_uptr_t	filter;		/* struct sock_filter * */
331 };
332 
333 static int do_set_attach_filter(struct socket *sock, int level, int optname,
334 				char __user *optval, int optlen)
335 {
336 	struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
337 	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
338 	compat_uptr_t ptr;
339 	u16 len;
340 
341 	if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
342 	    !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
343 	    __get_user(len, &fprog32->len) ||
344 	    __get_user(ptr, &fprog32->filter) ||
345 	    __put_user(len, &kfprog->len) ||
346 	    __put_user(compat_ptr(ptr), &kfprog->filter))
347 		return -EFAULT;
348 
349 	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
350 			      sizeof(struct sock_fprog));
351 }
352 
353 static int do_set_sock_timeout(struct socket *sock, int level,
354 		int optname, char __user *optval, int optlen)
355 {
356 	struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
357 	struct timeval ktime;
358 	mm_segment_t old_fs;
359 	int err;
360 
361 	if (optlen < sizeof(*up))
362 		return -EINVAL;
363 	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
364 	    __get_user(ktime.tv_sec, &up->tv_sec) ||
365 	    __get_user(ktime.tv_usec, &up->tv_usec))
366 		return -EFAULT;
367 	old_fs = get_fs();
368 	set_fs(KERNEL_DS);
369 	err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
370 	set_fs(old_fs);
371 
372 	return err;
373 }
374 
375 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
376 				char __user *optval, int optlen)
377 {
378 	if (optname == SO_ATTACH_FILTER)
379 		return do_set_attach_filter(sock, level, optname,
380 					    optval, optlen);
381 	if (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 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
388 				char __user *optval, int optlen)
389 {
390 	int err;
391 	struct socket *sock;
392 
393 	if (optlen < 0)
394 		return -EINVAL;
395 
396 	if ((sock = sockfd_lookup(fd, &err))!=NULL)
397 	{
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;
508 
509 	if ((sock = sockfd_lookup(fd, &err))!=NULL)
510 	{
511 		err = security_socket_getsockopt(sock, level,
512 							   optname);
513 		if (err) {
514 			sockfd_put(sock);
515 			return err;
516 		}
517 
518 		if (level == SOL_SOCKET)
519 			err = compat_sock_getsockopt(sock, level,
520 					optname, optval, optlen);
521 		else if (sock->ops->compat_getsockopt)
522 			err = sock->ops->compat_getsockopt(sock, level,
523 					optname, optval, optlen);
524 		else
525 			err = sock->ops->getsockopt(sock, level,
526 					optname, optval, optlen);
527 		sockfd_put(sock);
528 	}
529 	return err;
530 }
531 
532 struct compat_group_req {
533 	__u32				 gr_interface;
534 	struct __kernel_sockaddr_storage gr_group
535 		__attribute__ ((aligned(4)));
536 } __attribute__ ((packed));
537 
538 struct compat_group_source_req {
539 	__u32				 gsr_interface;
540 	struct __kernel_sockaddr_storage gsr_group
541 		__attribute__ ((aligned(4)));
542 	struct __kernel_sockaddr_storage gsr_source
543 		__attribute__ ((aligned(4)));
544 } __attribute__ ((packed));
545 
546 struct compat_group_filter {
547 	__u32				 gf_interface;
548 	struct __kernel_sockaddr_storage gf_group
549 		__attribute__ ((aligned(4)));
550 	__u32				 gf_fmode;
551 	__u32				 gf_numsrc;
552 	struct __kernel_sockaddr_storage gf_slist[1]
553 		__attribute__ ((aligned(4)));
554 } __attribute__ ((packed));
555 
556 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
557 			sizeof(struct __kernel_sockaddr_storage))
558 
559 
560 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
561 	char __user *optval, int optlen,
562 	int (*setsockopt)(struct sock *,int,int,char __user *,int))
563 {
564 	char __user	*koptval = optval;
565 	int		koptlen = optlen;
566 
567 	switch (optname) {
568 	case MCAST_JOIN_GROUP:
569 	case MCAST_LEAVE_GROUP:
570 	{
571 		struct compat_group_req __user *gr32 = (void *)optval;
572 		struct group_req __user *kgr =
573 			compat_alloc_user_space(sizeof(struct group_req));
574 		u32 interface;
575 
576 		if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
577 		    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
578 		    __get_user(interface, &gr32->gr_interface) ||
579 		    __put_user(interface, &kgr->gr_interface) ||
580 		    copy_in_user(&kgr->gr_group, &gr32->gr_group,
581 				sizeof(kgr->gr_group)))
582 			return -EFAULT;
583 		koptval = (char __user *)kgr;
584 		koptlen = sizeof(struct group_req);
585 		break;
586 	}
587 	case MCAST_JOIN_SOURCE_GROUP:
588 	case MCAST_LEAVE_SOURCE_GROUP:
589 	case MCAST_BLOCK_SOURCE:
590 	case MCAST_UNBLOCK_SOURCE:
591 	{
592 		struct compat_group_source_req __user *gsr32 = (void *)optval;
593 		struct group_source_req __user *kgsr = compat_alloc_user_space(
594 			sizeof(struct group_source_req));
595 		u32 interface;
596 
597 		if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
598 		    !access_ok(VERIFY_WRITE, kgsr,
599 			sizeof(struct group_source_req)) ||
600 		    __get_user(interface, &gsr32->gsr_interface) ||
601 		    __put_user(interface, &kgsr->gsr_interface) ||
602 		    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
603 				sizeof(kgsr->gsr_group)) ||
604 		    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
605 				sizeof(kgsr->gsr_source)))
606 			return -EFAULT;
607 		koptval = (char __user *)kgsr;
608 		koptlen = sizeof(struct group_source_req);
609 		break;
610 	}
611 	case MCAST_MSFILTER:
612 	{
613 		struct compat_group_filter __user *gf32 = (void *)optval;
614 		struct group_filter __user *kgf;
615 		u32 interface, fmode, numsrc;
616 
617 		if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
618 		    __get_user(interface, &gf32->gf_interface) ||
619 		    __get_user(fmode, &gf32->gf_fmode) ||
620 		    __get_user(numsrc, &gf32->gf_numsrc))
621 			return -EFAULT;
622 		koptlen = optlen + sizeof(struct group_filter) -
623 				sizeof(struct compat_group_filter);
624 		if (koptlen < GROUP_FILTER_SIZE(numsrc))
625 			return -EINVAL;
626 		kgf = compat_alloc_user_space(koptlen);
627 		if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
628 		    __put_user(interface, &kgf->gf_interface) ||
629 		    __put_user(fmode, &kgf->gf_fmode) ||
630 		    __put_user(numsrc, &kgf->gf_numsrc) ||
631 		    copy_in_user(&kgf->gf_group, &gf32->gf_group,
632 				sizeof(kgf->gf_group)) ||
633 		    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
634 				numsrc * sizeof(kgf->gf_slist[0]))))
635 			return -EFAULT;
636 		koptval = (char __user *)kgf;
637 		break;
638 	}
639 
640 	default:
641 		break;
642 	}
643 	return setsockopt(sock, level, optname, koptval, koptlen);
644 }
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 
725 EXPORT_SYMBOL(compat_mc_getsockopt);
726 
727 
728 /* Argument list sizes for compat_sys_socketcall */
729 #define AL(x) ((x) * sizeof(u32))
730 static unsigned char nas[19]={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)};
734 #undef AL
735 
736 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
737 {
738 	return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
739 }
740 
741 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
742 {
743 	return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
744 }
745 
746 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
747 {
748 	return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
749 }
750 
751 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
752 				    unsigned flags, struct sockaddr __user *addr,
753 				    int __user *addrlen)
754 {
755 	return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
756 }
757 
758 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
759 {
760 	int ret;
761 	u32 a[6];
762 	u32 a0, a1;
763 
764 	if (call < SYS_SOCKET || call > SYS_ACCEPT4)
765 		return -EINVAL;
766 	if (copy_from_user(a, args, nas[call]))
767 		return -EFAULT;
768 	a0 = a[0];
769 	a1 = a[1];
770 
771 	switch (call) {
772 	case SYS_SOCKET:
773 		ret = sys_socket(a0, a1, a[2]);
774 		break;
775 	case SYS_BIND:
776 		ret = sys_bind(a0, compat_ptr(a1), a[2]);
777 		break;
778 	case SYS_CONNECT:
779 		ret = sys_connect(a0, compat_ptr(a1), a[2]);
780 		break;
781 	case SYS_LISTEN:
782 		ret = sys_listen(a0, a1);
783 		break;
784 	case SYS_ACCEPT:
785 		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
786 		break;
787 	case SYS_GETSOCKNAME:
788 		ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
789 		break;
790 	case SYS_GETPEERNAME:
791 		ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
792 		break;
793 	case SYS_SOCKETPAIR:
794 		ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
795 		break;
796 	case SYS_SEND:
797 		ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
798 		break;
799 	case SYS_SENDTO:
800 		ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
801 		break;
802 	case SYS_RECV:
803 		ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
804 		break;
805 	case SYS_RECVFROM:
806 		ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
807 					  compat_ptr(a[4]), compat_ptr(a[5]));
808 		break;
809 	case SYS_SHUTDOWN:
810 		ret = sys_shutdown(a0,a1);
811 		break;
812 	case SYS_SETSOCKOPT:
813 		ret = compat_sys_setsockopt(a0, a1, a[2],
814 				compat_ptr(a[3]), a[4]);
815 		break;
816 	case SYS_GETSOCKOPT:
817 		ret = compat_sys_getsockopt(a0, a1, a[2],
818 				compat_ptr(a[3]), compat_ptr(a[4]));
819 		break;
820 	case SYS_SENDMSG:
821 		ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
822 		break;
823 	case SYS_RECVMSG:
824 		ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
825 		break;
826 	case SYS_ACCEPT4:
827 		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
828 		break;
829 	default:
830 		ret = -EINVAL;
831 		break;
832 	}
833 	return ret;
834 }
835