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Linux 4.13.16
[linux/fpc-iii.git] / net / compat.c
blob6ded6c821d7a21f296d14db02552ea1c71643051
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/audit.h>
26 #include <linux/export.h>
27
28 #include <net/scm.h>
29 #include <net/sock.h>
30 #include <net/ip.h>
31 #include <net/ipv6.h>
32 #include <linux/uaccess.h>
33 #include <net/compat.h>
34
35 int get_compat_msghdr(struct msghdr *kmsg,
36 struct compat_msghdr __user *umsg,
37 struct sockaddr __user **save_addr,
38 struct iovec **iov)
39 {
40 struct compat_msghdr msg;
41 ssize_t err;
42
43 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
44 return -EFAULT;
45
46 kmsg->msg_flags = msg.msg_flags;
47 kmsg->msg_namelen = msg.msg_namelen;
48
49 if (!msg.msg_name)
50 kmsg->msg_namelen = 0;
51
52 if (kmsg->msg_namelen < 0)
53 return -EINVAL;
54
55 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
56 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
57
58 kmsg->msg_control = compat_ptr(msg.msg_control);
59 kmsg->msg_controllen = msg.msg_controllen;
60
61 if (save_addr)
62 *save_addr = compat_ptr(msg.msg_name);
63
64 if (msg.msg_name && kmsg->msg_namelen) {
65 if (!save_addr) {
66 err = move_addr_to_kernel(compat_ptr(msg.msg_name),
67 kmsg->msg_namelen,
68 kmsg->msg_name);
69 if (err < 0)
70 return err;
71 }
72 } else {
73 kmsg->msg_name = NULL;
74 kmsg->msg_namelen = 0;
75 }
76
77 if (msg.msg_iovlen > UIO_MAXIOV)
78 return -EMSGSIZE;
79
80 kmsg->msg_iocb = NULL;
81
82 return compat_import_iovec(save_addr ? READ : WRITE,
83 compat_ptr(msg.msg_iov), msg.msg_iovlen,
84 UIO_FASTIOV, iov, &kmsg->msg_iter);
85 }
86
87 /* Bleech... */
88 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
89
90 #define CMSG_COMPAT_DATA(cmsg) \
91 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
92 #define CMSG_COMPAT_SPACE(len) \
93 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
94 #define CMSG_COMPAT_LEN(len) \
95 (sizeof(struct compat_cmsghdr) + (len))
96
97 #define CMSG_COMPAT_FIRSTHDR(msg) \
98 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
99 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
100 (struct compat_cmsghdr __user *)NULL)
101
102 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
103 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
104 (ucmlen) <= (unsigned long) \
105 ((mhdr)->msg_controllen - \
106 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
107
108 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
109 struct compat_cmsghdr __user *cmsg, int cmsg_len)
110 {
111 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
112 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
113 msg->msg_controllen)
114 return NULL;
115 return (struct compat_cmsghdr __user *)ptr;
116 }
117
118 /* There is a lot of hair here because the alignment rules (and
119 * thus placement) of cmsg headers and length are different for
120 * 32-bit apps. -DaveM
121 */
122 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
123 unsigned char *stackbuf, int stackbuf_size)
124 {
125 struct compat_cmsghdr __user *ucmsg;
126 struct cmsghdr *kcmsg, *kcmsg_base;
127 compat_size_t ucmlen;
128 __kernel_size_t kcmlen, tmp;
129 int err = -EFAULT;
130
131 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
132 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
133
134 kcmlen = 0;
135 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
136 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
137 while (ucmsg != NULL) {
138 if (get_user(ucmlen, &ucmsg->cmsg_len))
139 return -EFAULT;
140
141 /* Catch bogons. */
142 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
143 return -EINVAL;
144
145 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
146 tmp = CMSG_ALIGN(tmp);
147 kcmlen += tmp;
148 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
149 }
150 if (kcmlen == 0)
151 return -EINVAL;
152
153 /* The kcmlen holds the 64-bit version of the control length.
154 * It may not be modified as we do not stick it into the kmsg
155 * until we have successfully copied over all of the data
156 * from the user.
157 */
158 if (kcmlen > stackbuf_size)
159 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
160 if (kcmsg == NULL)
161 return -ENOBUFS;
162
163 /* Now copy them over neatly. */
164 memset(kcmsg, 0, kcmlen);
165 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
166 while (ucmsg != NULL) {
167 if (__get_user(ucmlen, &ucmsg->cmsg_len))
168 goto Efault;
169 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
170 goto Einval;
171 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
172 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
173 goto Einval;
174 kcmsg->cmsg_len = tmp;
175 tmp = CMSG_ALIGN(tmp);
176 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
177 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
178 copy_from_user(CMSG_DATA(kcmsg),
179 CMSG_COMPAT_DATA(ucmsg),
180 (ucmlen - sizeof(*ucmsg))))
181 goto Efault;
182
183 /* Advance. */
184 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
185 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
186 }
187
188 /* Ok, looks like we made it. Hook it up and return success. */
189 kmsg->msg_control = kcmsg_base;
190 kmsg->msg_controllen = kcmlen;
191 return 0;
192
193 Einval:
194 err = -EINVAL;
195 Efault:
196 if (kcmsg_base != (struct cmsghdr *)stackbuf)
197 sock_kfree_s(sk, kcmsg_base, kcmlen);
198 return err;
199 }
200
201 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
202 {
203 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
204 struct compat_cmsghdr cmhdr;
205 struct compat_timeval ctv;
206 struct compat_timespec cts[3];
207 int cmlen;
208
209 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
210 kmsg->msg_flags |= MSG_CTRUNC;
211 return 0; /* XXX: return error? check spec. */
212 }
213
214 if (!COMPAT_USE_64BIT_TIME) {
215 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
216 struct timeval *tv = (struct timeval *)data;
217 ctv.tv_sec = tv->tv_sec;
218 ctv.tv_usec = tv->tv_usec;
219 data = &ctv;
220 len = sizeof(ctv);
221 }
222 if (level == SOL_SOCKET &&
223 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
224 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
225 int i;
226 struct timespec *ts = (struct timespec *)data;
227 for (i = 0; i < count; i++) {
228 cts[i].tv_sec = ts[i].tv_sec;
229 cts[i].tv_nsec = ts[i].tv_nsec;
230 }
231 data = &cts;
232 len = sizeof(cts[0]) * count;
233 }
234 }
235
236 cmlen = CMSG_COMPAT_LEN(len);
237 if (kmsg->msg_controllen < cmlen) {
238 kmsg->msg_flags |= MSG_CTRUNC;
239 cmlen = kmsg->msg_controllen;
240 }
241 cmhdr.cmsg_level = level;
242 cmhdr.cmsg_type = type;
243 cmhdr.cmsg_len = cmlen;
244
245 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
246 return -EFAULT;
247 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
248 return -EFAULT;
249 cmlen = CMSG_COMPAT_SPACE(len);
250 if (kmsg->msg_controllen < cmlen)
251 cmlen = kmsg->msg_controllen;
252 kmsg->msg_control += cmlen;
253 kmsg->msg_controllen -= cmlen;
254 return 0;
255 }
256
257 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
258 {
259 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
260 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
261 int fdnum = scm->fp->count;
262 struct file **fp = scm->fp->fp;
263 int __user *cmfptr;
264 int err = 0, i;
265
266 if (fdnum < fdmax)
267 fdmax = fdnum;
268
269 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
270 int new_fd;
271 err = security_file_receive(fp[i]);
272 if (err)
273 break;
274 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
275 ? O_CLOEXEC : 0);
276 if (err < 0)
277 break;
278 new_fd = err;
279 err = put_user(new_fd, cmfptr);
280 if (err) {
281 put_unused_fd(new_fd);
282 break;
283 }
284 /* Bump the usage count and install the file. */
285 fd_install(new_fd, get_file(fp[i]));
286 }
287
288 if (i > 0) {
289 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
290 err = put_user(SOL_SOCKET, &cm->cmsg_level);
291 if (!err)
292 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
293 if (!err)
294 err = put_user(cmlen, &cm->cmsg_len);
295 if (!err) {
296 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
297 kmsg->msg_control += cmlen;
298 kmsg->msg_controllen -= cmlen;
299 }
300 }
301 if (i < fdnum)
302 kmsg->msg_flags |= MSG_CTRUNC;
303
304 /*
305 * All of the files that fit in the message have had their
306 * usage counts incremented, so we just free the list.
307 */
308 __scm_destroy(scm);
309 }
310
311 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
312 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
313 {
314 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
315 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
316 struct compat_sock_fprog f32;
317 struct sock_fprog f;
318
319 if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
320 return NULL;
321 memset(&f, 0, sizeof(f));
322 f.len = f32.len;
323 f.filter = compat_ptr(f32.filter);
324 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
325 return NULL;
326
327 return kfprog;
328 }
329 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
330
331 static int do_set_attach_filter(struct socket *sock, int level, int optname,
332 char __user *optval, unsigned int optlen)
333 {
334 struct sock_fprog __user *kfprog;
335
336 kfprog = get_compat_bpf_fprog(optval);
337 if (!kfprog)
338 return -EFAULT;
339
340 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
341 sizeof(struct sock_fprog));
342 }
343
344 static int do_set_sock_timeout(struct socket *sock, int level,
345 int optname, char __user *optval, unsigned int optlen)
346 {
347 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
348 struct timeval ktime;
349 mm_segment_t old_fs;
350 int err;
351
352 if (optlen < sizeof(*up))
353 return -EINVAL;
354 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
355 __get_user(ktime.tv_sec, &up->tv_sec) ||
356 __get_user(ktime.tv_usec, &up->tv_usec))
357 return -EFAULT;
358 old_fs = get_fs();
359 set_fs(KERNEL_DS);
360 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
361 set_fs(old_fs);
362
363 return err;
364 }
365
366 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
367 char __user *optval, unsigned int optlen)
368 {
369 if (optname == SO_ATTACH_FILTER ||
370 optname == SO_ATTACH_REUSEPORT_CBPF)
371 return do_set_attach_filter(sock, level, optname,
372 optval, optlen);
373 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
374 return do_set_sock_timeout(sock, level, optname, optval, optlen);
375
376 return sock_setsockopt(sock, level, optname, optval, optlen);
377 }
378
379 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
380 char __user *, optval, unsigned int, optlen)
381 {
382 int err;
383 struct socket *sock = sockfd_lookup(fd, &err);
384
385 if (sock) {
386 err = security_socket_setsockopt(sock, level, optname);
387 if (err) {
388 sockfd_put(sock);
389 return err;
390 }
391
392 if (level == SOL_SOCKET)
393 err = compat_sock_setsockopt(sock, level,
394 optname, optval, optlen);
395 else if (sock->ops->compat_setsockopt)
396 err = sock->ops->compat_setsockopt(sock, level,
397 optname, optval, optlen);
398 else
399 err = sock->ops->setsockopt(sock, level,
400 optname, optval, optlen);
401 sockfd_put(sock);
402 }
403 return err;
404 }
405
406 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
407 char __user *optval, int __user *optlen)
408 {
409 struct compat_timeval __user *up;
410 struct timeval ktime;
411 mm_segment_t old_fs;
412 int len, err;
413
414 up = (struct compat_timeval __user *) optval;
415 if (get_user(len, optlen))
416 return -EFAULT;
417 if (len < sizeof(*up))
418 return -EINVAL;
419 len = sizeof(ktime);
420 old_fs = get_fs();
421 set_fs(KERNEL_DS);
422 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
423 set_fs(old_fs);
424
425 if (!err) {
426 if (put_user(sizeof(*up), optlen) ||
427 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
428 __put_user(ktime.tv_sec, &up->tv_sec) ||
429 __put_user(ktime.tv_usec, &up->tv_usec))
430 err = -EFAULT;
431 }
432 return err;
433 }
434
435 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
436 char __user *optval, int __user *optlen)
437 {
438 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
439 return do_get_sock_timeout(sock, level, optname, optval, optlen);
440 return sock_getsockopt(sock, level, optname, optval, optlen);
441 }
442
443 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
444 {
445 struct compat_timeval __user *ctv;
446 int err;
447 struct timeval tv;
448
449 if (COMPAT_USE_64BIT_TIME)
450 return sock_get_timestamp(sk, userstamp);
451
452 ctv = (struct compat_timeval __user *) userstamp;
453 err = -ENOENT;
454 if (!sock_flag(sk, SOCK_TIMESTAMP))
455 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
456 tv = ktime_to_timeval(sk->sk_stamp);
457 if (tv.tv_sec == -1)
458 return err;
459 if (tv.tv_sec == 0) {
460 sk->sk_stamp = ktime_get_real();
461 tv = ktime_to_timeval(sk->sk_stamp);
462 }
463 err = 0;
464 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
465 put_user(tv.tv_usec, &ctv->tv_usec))
466 err = -EFAULT;
467 return err;
468 }
469 EXPORT_SYMBOL(compat_sock_get_timestamp);
470
471 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
472 {
473 struct compat_timespec __user *ctv;
474 int err;
475 struct timespec ts;
476
477 if (COMPAT_USE_64BIT_TIME)
478 return sock_get_timestampns (sk, userstamp);
479
480 ctv = (struct compat_timespec __user *) userstamp;
481 err = -ENOENT;
482 if (!sock_flag(sk, SOCK_TIMESTAMP))
483 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
484 ts = ktime_to_timespec(sk->sk_stamp);
485 if (ts.tv_sec == -1)
486 return err;
487 if (ts.tv_sec == 0) {
488 sk->sk_stamp = ktime_get_real();
489 ts = ktime_to_timespec(sk->sk_stamp);
490 }
491 err = 0;
492 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
493 put_user(ts.tv_nsec, &ctv->tv_nsec))
494 err = -EFAULT;
495 return err;
496 }
497 EXPORT_SYMBOL(compat_sock_get_timestampns);
498
499 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
500 char __user *, optval, int __user *, optlen)
501 {
502 int err;
503 struct socket *sock = sockfd_lookup(fd, &err);
504
505 if (sock) {
506 err = security_socket_getsockopt(sock, level, optname);
507 if (err) {
508 sockfd_put(sock);
509 return err;
510 }
511
512 if (level == SOL_SOCKET)
513 err = compat_sock_getsockopt(sock, level,
514 optname, optval, optlen);
515 else if (sock->ops->compat_getsockopt)
516 err = sock->ops->compat_getsockopt(sock, level,
517 optname, optval, optlen);
518 else
519 err = sock->ops->getsockopt(sock, level,
520 optname, optval, optlen);
521 sockfd_put(sock);
522 }
523 return err;
524 }
525
526 struct compat_group_req {
527 __u32 gr_interface;
528 struct __kernel_sockaddr_storage gr_group
529 __aligned(4);
530 } __packed;
531
532 struct compat_group_source_req {
533 __u32 gsr_interface;
534 struct __kernel_sockaddr_storage gsr_group
535 __aligned(4);
536 struct __kernel_sockaddr_storage gsr_source
537 __aligned(4);
538 } __packed;
539
540 struct compat_group_filter {
541 __u32 gf_interface;
542 struct __kernel_sockaddr_storage gf_group
543 __aligned(4);
544 __u32 gf_fmode;
545 __u32 gf_numsrc;
546 struct __kernel_sockaddr_storage gf_slist[1]
547 __aligned(4);
548 } __packed;
549
550 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
551 sizeof(struct __kernel_sockaddr_storage))
552
553
554 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
555 char __user *optval, unsigned int optlen,
556 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
557 {
558 char __user *koptval = optval;
559 int koptlen = optlen;
560
561 switch (optname) {
562 case MCAST_JOIN_GROUP:
563 case MCAST_LEAVE_GROUP:
564 {
565 struct compat_group_req __user *gr32 = (void *)optval;
566 struct group_req __user *kgr =
567 compat_alloc_user_space(sizeof(struct group_req));
568 u32 interface;
569
570 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
571 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
572 __get_user(interface, &gr32->gr_interface) ||
573 __put_user(interface, &kgr->gr_interface) ||
574 copy_in_user(&kgr->gr_group, &gr32->gr_group,
575 sizeof(kgr->gr_group)))
576 return -EFAULT;
577 koptval = (char __user *)kgr;
578 koptlen = sizeof(struct group_req);
579 break;
580 }
581 case MCAST_JOIN_SOURCE_GROUP:
582 case MCAST_LEAVE_SOURCE_GROUP:
583 case MCAST_BLOCK_SOURCE:
584 case MCAST_UNBLOCK_SOURCE:
585 {
586 struct compat_group_source_req __user *gsr32 = (void *)optval;
587 struct group_source_req __user *kgsr = compat_alloc_user_space(
588 sizeof(struct group_source_req));
589 u32 interface;
590
591 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
592 !access_ok(VERIFY_WRITE, kgsr,
593 sizeof(struct group_source_req)) ||
594 __get_user(interface, &gsr32->gsr_interface) ||
595 __put_user(interface, &kgsr->gsr_interface) ||
596 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
597 sizeof(kgsr->gsr_group)) ||
598 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
599 sizeof(kgsr->gsr_source)))
600 return -EFAULT;
601 koptval = (char __user *)kgsr;
602 koptlen = sizeof(struct group_source_req);
603 break;
604 }
605 case MCAST_MSFILTER:
606 {
607 struct compat_group_filter __user *gf32 = (void *)optval;
608 struct group_filter __user *kgf;
609 u32 interface, fmode, numsrc;
610
611 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
612 __get_user(interface, &gf32->gf_interface) ||
613 __get_user(fmode, &gf32->gf_fmode) ||
614 __get_user(numsrc, &gf32->gf_numsrc))
615 return -EFAULT;
616 koptlen = optlen + sizeof(struct group_filter) -
617 sizeof(struct compat_group_filter);
618 if (koptlen < GROUP_FILTER_SIZE(numsrc))
619 return -EINVAL;
620 kgf = compat_alloc_user_space(koptlen);
621 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
622 __put_user(interface, &kgf->gf_interface) ||
623 __put_user(fmode, &kgf->gf_fmode) ||
624 __put_user(numsrc, &kgf->gf_numsrc) ||
625 copy_in_user(&kgf->gf_group, &gf32->gf_group,
626 sizeof(kgf->gf_group)) ||
627 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
628 numsrc * sizeof(kgf->gf_slist[0]))))
629 return -EFAULT;
630 koptval = (char __user *)kgf;
631 break;
632 }
633
634 default:
635 break;
636 }
637 return setsockopt(sock, level, optname, koptval, koptlen);
638 }
639 EXPORT_SYMBOL(compat_mc_setsockopt);
640
641 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
642 char __user *optval, int __user *optlen,
643 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
644 {
645 struct compat_group_filter __user *gf32 = (void *)optval;
646 struct group_filter __user *kgf;
647 int __user *koptlen;
648 u32 interface, fmode, numsrc;
649 int klen, ulen, err;
650
651 if (optname != MCAST_MSFILTER)
652 return getsockopt(sock, level, optname, optval, optlen);
653
654 koptlen = compat_alloc_user_space(sizeof(*koptlen));
655 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
656 __get_user(ulen, optlen))
657 return -EFAULT;
658
659 /* adjust len for pad */
660 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
661
662 if (klen < GROUP_FILTER_SIZE(0))
663 return -EINVAL;
664
665 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
666 __put_user(klen, koptlen))
667 return -EFAULT;
668
669 /* have to allow space for previous compat_alloc_user_space, too */
670 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
671
672 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
673 __get_user(interface, &gf32->gf_interface) ||
674 __get_user(fmode, &gf32->gf_fmode) ||
675 __get_user(numsrc, &gf32->gf_numsrc) ||
676 __put_user(interface, &kgf->gf_interface) ||
677 __put_user(fmode, &kgf->gf_fmode) ||
678 __put_user(numsrc, &kgf->gf_numsrc) ||
679 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
680 return -EFAULT;
681
682 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
683 if (err)
684 return err;
685
686 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
687 __get_user(klen, koptlen))
688 return -EFAULT;
689
690 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
691
692 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
693 __put_user(ulen, optlen))
694 return -EFAULT;
695
696 if (!access_ok(VERIFY_READ, kgf, klen) ||
697 !access_ok(VERIFY_WRITE, gf32, ulen) ||
698 __get_user(interface, &kgf->gf_interface) ||
699 __get_user(fmode, &kgf->gf_fmode) ||
700 __get_user(numsrc, &kgf->gf_numsrc) ||
701 __put_user(interface, &gf32->gf_interface) ||
702 __put_user(fmode, &gf32->gf_fmode) ||
703 __put_user(numsrc, &gf32->gf_numsrc))
704 return -EFAULT;
705 if (numsrc) {
706 int copylen;
707
708 klen -= GROUP_FILTER_SIZE(0);
709 copylen = numsrc * sizeof(gf32->gf_slist[0]);
710 if (copylen > klen)
711 copylen = klen;
712 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
713 return -EFAULT;
714 }
715 return err;
716 }
717 EXPORT_SYMBOL(compat_mc_getsockopt);
718
719
720 /* Argument list sizes for compat_sys_socketcall */
721 #define AL(x) ((x) * sizeof(u32))
722 static unsigned char nas[21] = {
723 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
724 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
725 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
726 AL(4), AL(5), AL(4)
727 };
728 #undef AL
729
730 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
731 {
732 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
733 }
734
735 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
736 unsigned int, vlen, unsigned int, flags)
737 {
738 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
739 flags | MSG_CMSG_COMPAT);
740 }
741
742 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
743 {
744 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
745 }
746
747 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
748 {
749 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
750 }
751
752 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
753 unsigned int, flags, struct sockaddr __user *, addr,
754 int __user *, addrlen)
755 {
756 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
757 }
758
759 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
760 unsigned int, vlen, unsigned int, flags,
761 struct compat_timespec __user *, timeout)
762 {
763 int datagrams;
764 struct timespec ktspec;
765
766 if (timeout == NULL)
767 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
768 flags | MSG_CMSG_COMPAT, NULL);
769
770 if (compat_get_timespec(&ktspec, timeout))
771 return -EFAULT;
772
773 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
774 flags | MSG_CMSG_COMPAT, &ktspec);
775 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
776 datagrams = -EFAULT;
777
778 return datagrams;
779 }
780
781 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
782 {
783 u32 a[AUDITSC_ARGS];
784 unsigned int len;
785 u32 a0, a1;
786 int ret;
787
788 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
789 return -EINVAL;
790 len = nas[call];
791 if (len > sizeof(a))
792 return -EINVAL;
793
794 if (copy_from_user(a, args, len))
795 return -EFAULT;
796
797 ret = audit_socketcall_compat(len / sizeof(a[0]), a);
798 if (ret)
799 return ret;
800
801 a0 = a[0];
802 a1 = a[1];
803
804 switch (call) {
805 case SYS_SOCKET:
806 ret = sys_socket(a0, a1, a[2]);
807 break;
808 case SYS_BIND:
809 ret = sys_bind(a0, compat_ptr(a1), a[2]);
810 break;
811 case SYS_CONNECT:
812 ret = sys_connect(a0, compat_ptr(a1), a[2]);
813 break;
814 case SYS_LISTEN:
815 ret = sys_listen(a0, a1);
816 break;
817 case SYS_ACCEPT:
818 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
819 break;
820 case SYS_GETSOCKNAME:
821 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
822 break;
823 case SYS_GETPEERNAME:
824 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
825 break;
826 case SYS_SOCKETPAIR:
827 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
828 break;
829 case SYS_SEND:
830 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
831 break;
832 case SYS_SENDTO:
833 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
834 break;
835 case SYS_RECV:
836 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
837 break;
838 case SYS_RECVFROM:
839 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
840 compat_ptr(a[4]), compat_ptr(a[5]));
841 break;
842 case SYS_SHUTDOWN:
843 ret = sys_shutdown(a0, a1);
844 break;
845 case SYS_SETSOCKOPT:
846 ret = compat_sys_setsockopt(a0, a1, a[2],
847 compat_ptr(a[3]), a[4]);
848 break;
849 case SYS_GETSOCKOPT:
850 ret = compat_sys_getsockopt(a0, a1, a[2],
851 compat_ptr(a[3]), compat_ptr(a[4]));
852 break;
853 case SYS_SENDMSG:
854 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
855 break;
856 case SYS_SENDMMSG:
857 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
858 break;
859 case SYS_RECVMSG:
860 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
861 break;
862 case SYS_RECVMMSG:
863 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
864 compat_ptr(a[4]));
865 break;
866 case SYS_ACCEPT4:
867 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
868 break;
869 default:
870 ret = -EINVAL;
871 break;
872 }
873 return ret;
874 }
Linux with added FPC-III support