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
iov_from_user_compat_to_kern(struct iovec * kiov,struct compat_iovec __user * uiov32,int niov)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
get_compat_msghdr(struct msghdr * kmsg,struct compat_msghdr __user * umsg)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. */
verify_compat_iovec(struct msghdr * kern_msg,struct iovec * kern_iov,struct sockaddr_storage * kern_address,int mode)83 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
84 struct sockaddr_storage *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
cmsg_compat_nxthdr(struct msghdr * msg,struct compat_cmsghdr __user * cmsg,int cmsg_len)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 */
cmsghdr_from_user_compat_to_kern(struct msghdr * kmsg,struct sock * sk,unsigned char * stackbuf,int stackbuf_size)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
put_cmsg_compat(struct msghdr * kmsg,int level,int type,int len,void * data)223 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
224 {
225 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
226 struct compat_cmsghdr cmhdr;
227 struct compat_timeval ctv;
228 struct compat_timespec cts[3];
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 (!COMPAT_USE_64BIT_TIME) {
237 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
238 struct timeval *tv = (struct timeval *)data;
239 ctv.tv_sec = tv->tv_sec;
240 ctv.tv_usec = tv->tv_usec;
241 data = &ctv;
242 len = sizeof(ctv);
243 }
244 if (level == SOL_SOCKET &&
245 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
246 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
247 int i;
248 struct timespec *ts = (struct timespec *)data;
249 for (i = 0; i < count; i++) {
250 cts[i].tv_sec = ts[i].tv_sec;
251 cts[i].tv_nsec = ts[i].tv_nsec;
252 }
253 data = &cts;
254 len = sizeof(cts[0]) * count;
255 }
256 }
257
258 cmlen = CMSG_COMPAT_LEN(len);
259 if (kmsg->msg_controllen < cmlen) {
260 kmsg->msg_flags |= MSG_CTRUNC;
261 cmlen = kmsg->msg_controllen;
262 }
263 cmhdr.cmsg_level = level;
264 cmhdr.cmsg_type = type;
265 cmhdr.cmsg_len = cmlen;
266
267 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
268 return -EFAULT;
269 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
270 return -EFAULT;
271 cmlen = CMSG_COMPAT_SPACE(len);
272 if (kmsg->msg_controllen < cmlen)
273 cmlen = kmsg->msg_controllen;
274 kmsg->msg_control += cmlen;
275 kmsg->msg_controllen -= cmlen;
276 return 0;
277 }
278
scm_detach_fds_compat(struct msghdr * kmsg,struct scm_cookie * scm)279 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
280 {
281 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
282 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
283 int fdnum = scm->fp->count;
284 struct file **fp = scm->fp->fp;
285 int __user *cmfptr;
286 int err = 0, i;
287
288 if (fdnum < fdmax)
289 fdmax = fdnum;
290
291 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
292 int new_fd;
293 err = security_file_receive(fp[i]);
294 if (err)
295 break;
296 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
297 ? O_CLOEXEC : 0);
298 if (err < 0)
299 break;
300 new_fd = err;
301 err = put_user(new_fd, cmfptr);
302 if (err) {
303 put_unused_fd(new_fd);
304 break;
305 }
306 /* Bump the usage count and install the file. */
307 get_file(fp[i]);
308 fd_install(new_fd, fp[i]);
309 }
310
311 if (i > 0) {
312 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
313 err = put_user(SOL_SOCKET, &cm->cmsg_level);
314 if (!err)
315 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
316 if (!err)
317 err = put_user(cmlen, &cm->cmsg_len);
318 if (!err) {
319 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
320 kmsg->msg_control += cmlen;
321 kmsg->msg_controllen -= cmlen;
322 }
323 }
324 if (i < fdnum)
325 kmsg->msg_flags |= MSG_CTRUNC;
326
327 /*
328 * All of the files that fit in the message have had their
329 * usage counts incremented, so we just free the list.
330 */
331 __scm_destroy(scm);
332 }
333
334 /*
335 * A struct sock_filter is architecture independent.
336 */
337 struct compat_sock_fprog {
338 u16 len;
339 compat_uptr_t filter; /* struct sock_filter * */
340 };
341
do_set_attach_filter(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)342 static int do_set_attach_filter(struct socket *sock, int level, int optname,
343 char __user *optval, unsigned int optlen)
344 {
345 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
346 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
347 compat_uptr_t ptr;
348 u16 len;
349
350 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
351 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
352 __get_user(len, &fprog32->len) ||
353 __get_user(ptr, &fprog32->filter) ||
354 __put_user(len, &kfprog->len) ||
355 __put_user(compat_ptr(ptr), &kfprog->filter))
356 return -EFAULT;
357
358 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
359 sizeof(struct sock_fprog));
360 }
361
do_set_sock_timeout(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)362 static int do_set_sock_timeout(struct socket *sock, int level,
363 int optname, char __user *optval, unsigned int optlen)
364 {
365 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
366 struct timeval ktime;
367 mm_segment_t old_fs;
368 int err;
369
370 if (optlen < sizeof(*up))
371 return -EINVAL;
372 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
373 __get_user(ktime.tv_sec, &up->tv_sec) ||
374 __get_user(ktime.tv_usec, &up->tv_usec))
375 return -EFAULT;
376 old_fs = get_fs();
377 set_fs(KERNEL_DS);
378 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
379 set_fs(old_fs);
380
381 return err;
382 }
383
compat_sock_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)384 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
385 char __user *optval, unsigned int optlen)
386 {
387 if (optname == SO_ATTACH_FILTER)
388 return do_set_attach_filter(sock, level, optname,
389 optval, optlen);
390 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
391 return do_set_sock_timeout(sock, level, optname, optval, optlen);
392
393 return sock_setsockopt(sock, level, optname, optval, optlen);
394 }
395
compat_sys_setsockopt(int fd,int level,int optname,char __user * optval,unsigned int optlen)396 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
397 char __user *optval, unsigned int optlen)
398 {
399 int err;
400 struct socket *sock = sockfd_lookup(fd, &err);
401
402 if (sock) {
403 err = security_socket_setsockopt(sock, level, optname);
404 if (err) {
405 sockfd_put(sock);
406 return err;
407 }
408
409 if (level == SOL_SOCKET)
410 err = compat_sock_setsockopt(sock, level,
411 optname, optval, optlen);
412 else if (sock->ops->compat_setsockopt)
413 err = sock->ops->compat_setsockopt(sock, level,
414 optname, optval, optlen);
415 else
416 err = sock->ops->setsockopt(sock, level,
417 optname, optval, optlen);
418 sockfd_put(sock);
419 }
420 return err;
421 }
422
do_get_sock_timeout(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)423 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
424 char __user *optval, int __user *optlen)
425 {
426 struct compat_timeval __user *up;
427 struct timeval ktime;
428 mm_segment_t old_fs;
429 int len, err;
430
431 up = (struct compat_timeval __user *) optval;
432 if (get_user(len, optlen))
433 return -EFAULT;
434 if (len < sizeof(*up))
435 return -EINVAL;
436 len = sizeof(ktime);
437 old_fs = get_fs();
438 set_fs(KERNEL_DS);
439 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
440 set_fs(old_fs);
441
442 if (!err) {
443 if (put_user(sizeof(*up), optlen) ||
444 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
445 __put_user(ktime.tv_sec, &up->tv_sec) ||
446 __put_user(ktime.tv_usec, &up->tv_usec))
447 err = -EFAULT;
448 }
449 return err;
450 }
451
compat_sock_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)452 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
453 char __user *optval, int __user *optlen)
454 {
455 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
456 return do_get_sock_timeout(sock, level, optname, optval, optlen);
457 return sock_getsockopt(sock, level, optname, optval, optlen);
458 }
459
compat_sock_get_timestamp(struct sock * sk,struct timeval __user * userstamp)460 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
461 {
462 struct compat_timeval __user *ctv;
463 int err;
464 struct timeval tv;
465
466 if (COMPAT_USE_64BIT_TIME)
467 return sock_get_timestamp(sk, userstamp);
468
469 ctv = (struct compat_timeval __user *) userstamp;
470 err = -ENOENT;
471 if (!sock_flag(sk, SOCK_TIMESTAMP))
472 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
473 tv = ktime_to_timeval(sk->sk_stamp);
474 if (tv.tv_sec == -1)
475 return err;
476 if (tv.tv_sec == 0) {
477 sk->sk_stamp = ktime_get_real();
478 tv = ktime_to_timeval(sk->sk_stamp);
479 }
480 err = 0;
481 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
482 put_user(tv.tv_usec, &ctv->tv_usec))
483 err = -EFAULT;
484 return err;
485 }
486 EXPORT_SYMBOL(compat_sock_get_timestamp);
487
compat_sock_get_timestampns(struct sock * sk,struct timespec __user * userstamp)488 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
489 {
490 struct compat_timespec __user *ctv;
491 int err;
492 struct timespec ts;
493
494 if (COMPAT_USE_64BIT_TIME)
495 return sock_get_timestampns (sk, userstamp);
496
497 ctv = (struct compat_timespec __user *) userstamp;
498 err = -ENOENT;
499 if (!sock_flag(sk, SOCK_TIMESTAMP))
500 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
501 ts = ktime_to_timespec(sk->sk_stamp);
502 if (ts.tv_sec == -1)
503 return err;
504 if (ts.tv_sec == 0) {
505 sk->sk_stamp = ktime_get_real();
506 ts = ktime_to_timespec(sk->sk_stamp);
507 }
508 err = 0;
509 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
510 put_user(ts.tv_nsec, &ctv->tv_nsec))
511 err = -EFAULT;
512 return err;
513 }
514 EXPORT_SYMBOL(compat_sock_get_timestampns);
515
compat_sys_getsockopt(int fd,int level,int optname,char __user * optval,int __user * optlen)516 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
517 char __user *optval, int __user *optlen)
518 {
519 int err;
520 struct socket *sock = sockfd_lookup(fd, &err);
521
522 if (sock) {
523 err = security_socket_getsockopt(sock, level, optname);
524 if (err) {
525 sockfd_put(sock);
526 return err;
527 }
528
529 if (level == SOL_SOCKET)
530 err = compat_sock_getsockopt(sock, level,
531 optname, optval, optlen);
532 else if (sock->ops->compat_getsockopt)
533 err = sock->ops->compat_getsockopt(sock, level,
534 optname, optval, optlen);
535 else
536 err = sock->ops->getsockopt(sock, level,
537 optname, optval, optlen);
538 sockfd_put(sock);
539 }
540 return err;
541 }
542
543 struct compat_group_req {
544 __u32 gr_interface;
545 struct __kernel_sockaddr_storage gr_group
546 __attribute__ ((aligned(4)));
547 } __packed;
548
549 struct compat_group_source_req {
550 __u32 gsr_interface;
551 struct __kernel_sockaddr_storage gsr_group
552 __attribute__ ((aligned(4)));
553 struct __kernel_sockaddr_storage gsr_source
554 __attribute__ ((aligned(4)));
555 } __packed;
556
557 struct compat_group_filter {
558 __u32 gf_interface;
559 struct __kernel_sockaddr_storage gf_group
560 __attribute__ ((aligned(4)));
561 __u32 gf_fmode;
562 __u32 gf_numsrc;
563 struct __kernel_sockaddr_storage gf_slist[1]
564 __attribute__ ((aligned(4)));
565 } __packed;
566
567 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
568 sizeof(struct __kernel_sockaddr_storage))
569
570
compat_mc_setsockopt(struct sock * sock,int level,int optname,char __user * optval,unsigned int optlen,int (* setsockopt)(struct sock *,int,int,char __user *,unsigned int))571 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
572 char __user *optval, unsigned int optlen,
573 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
574 {
575 char __user *koptval = optval;
576 int koptlen = optlen;
577
578 switch (optname) {
579 case MCAST_JOIN_GROUP:
580 case MCAST_LEAVE_GROUP:
581 {
582 struct compat_group_req __user *gr32 = (void *)optval;
583 struct group_req __user *kgr =
584 compat_alloc_user_space(sizeof(struct group_req));
585 u32 interface;
586
587 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
588 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
589 __get_user(interface, &gr32->gr_interface) ||
590 __put_user(interface, &kgr->gr_interface) ||
591 copy_in_user(&kgr->gr_group, &gr32->gr_group,
592 sizeof(kgr->gr_group)))
593 return -EFAULT;
594 koptval = (char __user *)kgr;
595 koptlen = sizeof(struct group_req);
596 break;
597 }
598 case MCAST_JOIN_SOURCE_GROUP:
599 case MCAST_LEAVE_SOURCE_GROUP:
600 case MCAST_BLOCK_SOURCE:
601 case MCAST_UNBLOCK_SOURCE:
602 {
603 struct compat_group_source_req __user *gsr32 = (void *)optval;
604 struct group_source_req __user *kgsr = compat_alloc_user_space(
605 sizeof(struct group_source_req));
606 u32 interface;
607
608 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
609 !access_ok(VERIFY_WRITE, kgsr,
610 sizeof(struct group_source_req)) ||
611 __get_user(interface, &gsr32->gsr_interface) ||
612 __put_user(interface, &kgsr->gsr_interface) ||
613 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
614 sizeof(kgsr->gsr_group)) ||
615 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
616 sizeof(kgsr->gsr_source)))
617 return -EFAULT;
618 koptval = (char __user *)kgsr;
619 koptlen = sizeof(struct group_source_req);
620 break;
621 }
622 case MCAST_MSFILTER:
623 {
624 struct compat_group_filter __user *gf32 = (void *)optval;
625 struct group_filter __user *kgf;
626 u32 interface, fmode, numsrc;
627
628 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
629 __get_user(interface, &gf32->gf_interface) ||
630 __get_user(fmode, &gf32->gf_fmode) ||
631 __get_user(numsrc, &gf32->gf_numsrc))
632 return -EFAULT;
633 koptlen = optlen + sizeof(struct group_filter) -
634 sizeof(struct compat_group_filter);
635 if (koptlen < GROUP_FILTER_SIZE(numsrc))
636 return -EINVAL;
637 kgf = compat_alloc_user_space(koptlen);
638 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
639 __put_user(interface, &kgf->gf_interface) ||
640 __put_user(fmode, &kgf->gf_fmode) ||
641 __put_user(numsrc, &kgf->gf_numsrc) ||
642 copy_in_user(&kgf->gf_group, &gf32->gf_group,
643 sizeof(kgf->gf_group)) ||
644 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
645 numsrc * sizeof(kgf->gf_slist[0]))))
646 return -EFAULT;
647 koptval = (char __user *)kgf;
648 break;
649 }
650
651 default:
652 break;
653 }
654 return setsockopt(sock, level, optname, koptval, koptlen);
655 }
656 EXPORT_SYMBOL(compat_mc_setsockopt);
657
compat_mc_getsockopt(struct sock * sock,int level,int optname,char __user * optval,int __user * optlen,int (* getsockopt)(struct sock *,int,int,char __user *,int __user *))658 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
659 char __user *optval, int __user *optlen,
660 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
661 {
662 struct compat_group_filter __user *gf32 = (void *)optval;
663 struct group_filter __user *kgf;
664 int __user *koptlen;
665 u32 interface, fmode, numsrc;
666 int klen, ulen, err;
667
668 if (optname != MCAST_MSFILTER)
669 return getsockopt(sock, level, optname, optval, optlen);
670
671 koptlen = compat_alloc_user_space(sizeof(*koptlen));
672 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
673 __get_user(ulen, optlen))
674 return -EFAULT;
675
676 /* adjust len for pad */
677 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
678
679 if (klen < GROUP_FILTER_SIZE(0))
680 return -EINVAL;
681
682 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
683 __put_user(klen, koptlen))
684 return -EFAULT;
685
686 /* have to allow space for previous compat_alloc_user_space, too */
687 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
688
689 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
690 __get_user(interface, &gf32->gf_interface) ||
691 __get_user(fmode, &gf32->gf_fmode) ||
692 __get_user(numsrc, &gf32->gf_numsrc) ||
693 __put_user(interface, &kgf->gf_interface) ||
694 __put_user(fmode, &kgf->gf_fmode) ||
695 __put_user(numsrc, &kgf->gf_numsrc) ||
696 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
697 return -EFAULT;
698
699 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
700 if (err)
701 return err;
702
703 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
704 __get_user(klen, koptlen))
705 return -EFAULT;
706
707 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
708
709 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
710 __put_user(ulen, optlen))
711 return -EFAULT;
712
713 if (!access_ok(VERIFY_READ, kgf, klen) ||
714 !access_ok(VERIFY_WRITE, gf32, ulen) ||
715 __get_user(interface, &kgf->gf_interface) ||
716 __get_user(fmode, &kgf->gf_fmode) ||
717 __get_user(numsrc, &kgf->gf_numsrc) ||
718 __put_user(interface, &gf32->gf_interface) ||
719 __put_user(fmode, &gf32->gf_fmode) ||
720 __put_user(numsrc, &gf32->gf_numsrc))
721 return -EFAULT;
722 if (numsrc) {
723 int copylen;
724
725 klen -= GROUP_FILTER_SIZE(0);
726 copylen = numsrc * sizeof(gf32->gf_slist[0]);
727 if (copylen > klen)
728 copylen = klen;
729 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
730 return -EFAULT;
731 }
732 return err;
733 }
734 EXPORT_SYMBOL(compat_mc_getsockopt);
735
736
737 /* Argument list sizes for compat_sys_socketcall */
738 #define AL(x) ((x) * sizeof(u32))
739 static unsigned char nas[21] = {
740 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
741 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
742 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
743 AL(4), AL(5), AL(4)
744 };
745 #undef AL
746
compat_sys_sendmsg(int fd,struct compat_msghdr __user * msg,unsigned flags)747 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
748 {
749 if (flags & MSG_CMSG_COMPAT)
750 return -EINVAL;
751 return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
752 }
753
compat_sys_sendmmsg(int fd,struct compat_mmsghdr __user * mmsg,unsigned vlen,unsigned int flags)754 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
755 unsigned vlen, unsigned int flags)
756 {
757 if (flags & MSG_CMSG_COMPAT)
758 return -EINVAL;
759 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
760 flags | MSG_CMSG_COMPAT);
761 }
762
compat_sys_recvmsg(int fd,struct compat_msghdr __user * msg,unsigned int flags)763 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
764 {
765 if (flags & MSG_CMSG_COMPAT)
766 return -EINVAL;
767 return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
768 }
769
compat_sys_recv(int fd,void __user * buf,size_t len,unsigned flags)770 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
771 {
772 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
773 }
774
compat_sys_recvfrom(int fd,void __user * buf,size_t len,unsigned flags,struct sockaddr __user * addr,int __user * addrlen)775 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
776 unsigned flags, struct sockaddr __user *addr,
777 int __user *addrlen)
778 {
779 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
780 }
781
compat_sys_recvmmsg(int fd,struct compat_mmsghdr __user * mmsg,unsigned vlen,unsigned int flags,struct compat_timespec __user * timeout)782 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
783 unsigned vlen, unsigned int flags,
784 struct compat_timespec __user *timeout)
785 {
786 int datagrams;
787 struct timespec ktspec;
788
789 if (flags & MSG_CMSG_COMPAT)
790 return -EINVAL;
791
792 if (timeout == NULL)
793 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
794 flags | MSG_CMSG_COMPAT, NULL);
795
796 if (compat_get_timespec(&ktspec, timeout))
797 return -EFAULT;
798
799 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
800 flags | MSG_CMSG_COMPAT, &ktspec);
801 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
802 datagrams = -EFAULT;
803
804 return datagrams;
805 }
806
compat_sys_socketcall(int call,u32 __user * args)807 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
808 {
809 int ret;
810 u32 a[6];
811 u32 a0, a1;
812
813 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
814 return -EINVAL;
815 if (copy_from_user(a, args, nas[call]))
816 return -EFAULT;
817 a0 = a[0];
818 a1 = a[1];
819
820 switch (call) {
821 case SYS_SOCKET:
822 ret = sys_socket(a0, a1, a[2]);
823 break;
824 case SYS_BIND:
825 ret = sys_bind(a0, compat_ptr(a1), a[2]);
826 break;
827 case SYS_CONNECT:
828 ret = sys_connect(a0, compat_ptr(a1), a[2]);
829 break;
830 case SYS_LISTEN:
831 ret = sys_listen(a0, a1);
832 break;
833 case SYS_ACCEPT:
834 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
835 break;
836 case SYS_GETSOCKNAME:
837 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
838 break;
839 case SYS_GETPEERNAME:
840 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
841 break;
842 case SYS_SOCKETPAIR:
843 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
844 break;
845 case SYS_SEND:
846 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
847 break;
848 case SYS_SENDTO:
849 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
850 break;
851 case SYS_RECV:
852 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
853 break;
854 case SYS_RECVFROM:
855 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
856 compat_ptr(a[4]), compat_ptr(a[5]));
857 break;
858 case SYS_SHUTDOWN:
859 ret = sys_shutdown(a0, a1);
860 break;
861 case SYS_SETSOCKOPT:
862 ret = compat_sys_setsockopt(a0, a1, a[2],
863 compat_ptr(a[3]), a[4]);
864 break;
865 case SYS_GETSOCKOPT:
866 ret = compat_sys_getsockopt(a0, a1, a[2],
867 compat_ptr(a[3]), compat_ptr(a[4]));
868 break;
869 case SYS_SENDMSG:
870 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
871 break;
872 case SYS_SENDMMSG:
873 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
874 break;
875 case SYS_RECVMSG:
876 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
877 break;
878 case SYS_RECVMMSG:
879 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
880 compat_ptr(a[4]));
881 break;
882 case SYS_ACCEPT4:
883 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
884 break;
885 default:
886 ret = -EINVAL;
887 break;
888 }
889 return ret;
890 }
891