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 <asm/uaccess.h>
33 #include <net/compat.h>
34
get_compat_msghdr(struct msghdr * kmsg,struct compat_msghdr __user * umsg,struct sockaddr __user ** save_addr,struct iovec ** iov)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 compat_uptr_t uaddr, uiov, tmp3;
41 compat_size_t nr_segs;
42 ssize_t err;
43
44 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
45 __get_user(uaddr, &umsg->msg_name) ||
46 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
47 __get_user(uiov, &umsg->msg_iov) ||
48 __get_user(nr_segs, &umsg->msg_iovlen) ||
49 __get_user(tmp3, &umsg->msg_control) ||
50 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
51 __get_user(kmsg->msg_flags, &umsg->msg_flags))
52 return -EFAULT;
53
54 if (!uaddr)
55 kmsg->msg_namelen = 0;
56
57 if (kmsg->msg_namelen < 0)
58 return -EINVAL;
59
60 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
61 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
62 kmsg->msg_control = compat_ptr(tmp3);
63
64 if (save_addr)
65 *save_addr = compat_ptr(uaddr);
66
67 if (uaddr && kmsg->msg_namelen) {
68 if (!save_addr) {
69 err = move_addr_to_kernel(compat_ptr(uaddr),
70 kmsg->msg_namelen,
71 kmsg->msg_name);
72 if (err < 0)
73 return err;
74 }
75 } else {
76 kmsg->msg_name = NULL;
77 kmsg->msg_namelen = 0;
78 }
79
80 if (nr_segs > UIO_MAXIOV)
81 return -EMSGSIZE;
82
83 kmsg->msg_iocb = NULL;
84
85 return compat_import_iovec(save_addr ? READ : WRITE,
86 compat_ptr(uiov), nr_segs,
87 UIO_FASTIOV, iov, &kmsg->msg_iter);
88 }
89
90 /* Bleech... */
91 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
92
93 #define CMSG_COMPAT_DATA(cmsg) \
94 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
95 #define CMSG_COMPAT_SPACE(len) \
96 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
97 #define CMSG_COMPAT_LEN(len) \
98 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
99
100 #define CMSG_COMPAT_FIRSTHDR(msg) \
101 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
102 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
103 (struct compat_cmsghdr __user *)NULL)
104
105 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
106 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
107 (ucmlen) <= (unsigned long) \
108 ((mhdr)->msg_controllen - \
109 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
110
cmsg_compat_nxthdr(struct msghdr * msg,struct compat_cmsghdr __user * cmsg,int cmsg_len)111 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
112 struct compat_cmsghdr __user *cmsg, int cmsg_len)
113 {
114 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
115 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
116 msg->msg_controllen)
117 return NULL;
118 return (struct compat_cmsghdr __user *)ptr;
119 }
120
121 /* There is a lot of hair here because the alignment rules (and
122 * thus placement) of cmsg headers and length are different for
123 * 32-bit apps. -DaveM
124 */
cmsghdr_from_user_compat_to_kern(struct msghdr * kmsg,struct sock * sk,unsigned char * stackbuf,int stackbuf_size)125 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
126 unsigned char *stackbuf, int stackbuf_size)
127 {
128 struct compat_cmsghdr __user *ucmsg;
129 struct cmsghdr *kcmsg, *kcmsg_base;
130 compat_size_t ucmlen;
131 __kernel_size_t kcmlen, tmp;
132 int err = -EFAULT;
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 - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
146 CMSG_ALIGN(sizeof(struct cmsghdr)));
147 tmp = CMSG_ALIGN(tmp);
148 kcmlen += tmp;
149 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
150 }
151 if (kcmlen == 0)
152 return -EINVAL;
153
154 /* The kcmlen holds the 64-bit version of the control length.
155 * It may not be modified as we do not stick it into the kmsg
156 * until we have successfully copied over all of the data
157 * from the user.
158 */
159 if (kcmlen > stackbuf_size)
160 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
161 if (kcmsg == NULL)
162 return -ENOMEM;
163
164 /* Now copy them over neatly. */
165 memset(kcmsg, 0, kcmlen);
166 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
167 while (ucmsg != NULL) {
168 if (__get_user(ucmlen, &ucmsg->cmsg_len))
169 goto Efault;
170 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
171 goto Einval;
172 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
173 CMSG_ALIGN(sizeof(struct cmsghdr)));
174 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
175 goto Einval;
176 kcmsg->cmsg_len = tmp;
177 tmp = CMSG_ALIGN(tmp);
178 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
179 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
180 copy_from_user(CMSG_DATA(kcmsg),
181 CMSG_COMPAT_DATA(ucmsg),
182 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
183 goto Efault;
184
185 /* Advance. */
186 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
187 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
188 }
189
190 /* Ok, looks like we made it. Hook it up and return success. */
191 kmsg->msg_control = kcmsg_base;
192 kmsg->msg_controllen = kcmlen;
193 return 0;
194
195 Einval:
196 err = -EINVAL;
197 Efault:
198 if (kcmsg_base != (struct cmsghdr *)stackbuf)
199 sock_kfree_s(sk, kcmsg_base, kcmlen);
200 return err;
201 }
202
put_cmsg_compat(struct msghdr * kmsg,int level,int type,int len,void * data)203 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
204 {
205 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
206 struct compat_cmsghdr cmhdr;
207 struct compat_timeval ctv;
208 struct compat_timespec cts[3];
209 int cmlen;
210
211 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
212 kmsg->msg_flags |= MSG_CTRUNC;
213 return 0; /* XXX: return error? check spec. */
214 }
215
216 if (!COMPAT_USE_64BIT_TIME) {
217 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
218 struct timeval *tv = (struct timeval *)data;
219 ctv.tv_sec = tv->tv_sec;
220 ctv.tv_usec = tv->tv_usec;
221 data = &ctv;
222 len = sizeof(ctv);
223 }
224 if (level == SOL_SOCKET &&
225 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
226 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
227 int i;
228 struct timespec *ts = (struct timespec *)data;
229 for (i = 0; i < count; i++) {
230 cts[i].tv_sec = ts[i].tv_sec;
231 cts[i].tv_nsec = ts[i].tv_nsec;
232 }
233 data = &cts;
234 len = sizeof(cts[0]) * count;
235 }
236 }
237
238 cmlen = CMSG_COMPAT_LEN(len);
239 if (kmsg->msg_controllen < cmlen) {
240 kmsg->msg_flags |= MSG_CTRUNC;
241 cmlen = kmsg->msg_controllen;
242 }
243 cmhdr.cmsg_level = level;
244 cmhdr.cmsg_type = type;
245 cmhdr.cmsg_len = cmlen;
246
247 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
248 return -EFAULT;
249 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
250 return -EFAULT;
251 cmlen = CMSG_COMPAT_SPACE(len);
252 if (kmsg->msg_controllen < cmlen)
253 cmlen = kmsg->msg_controllen;
254 kmsg->msg_control += cmlen;
255 kmsg->msg_controllen -= cmlen;
256 return 0;
257 }
258
scm_detach_fds_compat(struct msghdr * kmsg,struct scm_cookie * scm)259 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
260 {
261 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
262 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
263 int fdnum = scm->fp->count;
264 struct file **fp = scm->fp->fp;
265 int __user *cmfptr;
266 int err = 0, i;
267
268 if (fdnum < fdmax)
269 fdmax = fdnum;
270
271 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
272 int new_fd;
273 err = security_file_receive(fp[i]);
274 if (err)
275 break;
276 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
277 ? O_CLOEXEC : 0);
278 if (err < 0)
279 break;
280 new_fd = err;
281 err = put_user(new_fd, cmfptr);
282 if (err) {
283 put_unused_fd(new_fd);
284 break;
285 }
286 /* Bump the usage count and install the file. */
287 __receive_sock(fp[i]);
288 fd_install(new_fd, get_file(fp[i]));
289 }
290
291 if (i > 0) {
292 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
293 err = put_user(SOL_SOCKET, &cm->cmsg_level);
294 if (!err)
295 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
296 if (!err)
297 err = put_user(cmlen, &cm->cmsg_len);
298 if (!err) {
299 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
300 kmsg->msg_control += cmlen;
301 kmsg->msg_controllen -= cmlen;
302 }
303 }
304 if (i < fdnum)
305 kmsg->msg_flags |= MSG_CTRUNC;
306
307 /*
308 * All of the files that fit in the message have had their
309 * usage counts incremented, so we just free the list.
310 */
311 __scm_destroy(scm);
312 }
313
do_set_attach_filter(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)314 static int do_set_attach_filter(struct socket *sock, int level, int optname,
315 char __user *optval, unsigned int optlen)
316 {
317 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
318 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
319 compat_uptr_t ptr;
320 u16 len;
321
322 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
323 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
324 __get_user(len, &fprog32->len) ||
325 __get_user(ptr, &fprog32->filter) ||
326 __put_user(len, &kfprog->len) ||
327 __put_user(compat_ptr(ptr), &kfprog->filter))
328 return -EFAULT;
329
330 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
331 sizeof(struct sock_fprog));
332 }
333
do_set_sock_timeout(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)334 static int do_set_sock_timeout(struct socket *sock, int level,
335 int optname, char __user *optval, unsigned int optlen)
336 {
337 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
338 struct timeval ktime;
339 mm_segment_t old_fs;
340 int err;
341
342 if (optlen < sizeof(*up))
343 return -EINVAL;
344 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
345 __get_user(ktime.tv_sec, &up->tv_sec) ||
346 __get_user(ktime.tv_usec, &up->tv_usec))
347 return -EFAULT;
348 old_fs = get_fs();
349 set_fs(KERNEL_DS);
350 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
351 set_fs(old_fs);
352
353 return err;
354 }
355
compat_sock_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)356 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
357 char __user *optval, unsigned int optlen)
358 {
359 if (optname == SO_ATTACH_FILTER)
360 return do_set_attach_filter(sock, level, optname,
361 optval, optlen);
362 if (!COMPAT_USE_64BIT_TIME &&
363 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
364 return do_set_sock_timeout(sock, level, optname, optval, optlen);
365
366 return sock_setsockopt(sock, level, optname, optval, optlen);
367 }
368
COMPAT_SYSCALL_DEFINE5(setsockopt,int,fd,int,level,int,optname,char __user *,optval,unsigned int,optlen)369 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
370 char __user *, optval, unsigned int, optlen)
371 {
372 int err;
373 struct socket *sock = sockfd_lookup(fd, &err);
374
375 if (sock) {
376 err = security_socket_setsockopt(sock, level, optname);
377 if (err) {
378 sockfd_put(sock);
379 return err;
380 }
381
382 if (level == SOL_SOCKET)
383 err = compat_sock_setsockopt(sock, level,
384 optname, optval, optlen);
385 else if (sock->ops->compat_setsockopt)
386 err = sock->ops->compat_setsockopt(sock, level,
387 optname, optval, optlen);
388 else
389 err = sock->ops->setsockopt(sock, level,
390 optname, optval, optlen);
391 sockfd_put(sock);
392 }
393 return err;
394 }
395
do_get_sock_timeout(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)396 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
397 char __user *optval, int __user *optlen)
398 {
399 struct compat_timeval __user *up;
400 struct timeval ktime;
401 mm_segment_t old_fs;
402 int len, err;
403
404 up = (struct compat_timeval __user *) optval;
405 if (get_user(len, optlen))
406 return -EFAULT;
407 if (len < sizeof(*up))
408 return -EINVAL;
409 len = sizeof(ktime);
410 old_fs = get_fs();
411 set_fs(KERNEL_DS);
412 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
413 set_fs(old_fs);
414
415 if (!err) {
416 if (put_user(sizeof(*up), optlen) ||
417 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
418 __put_user(ktime.tv_sec, &up->tv_sec) ||
419 __put_user(ktime.tv_usec, &up->tv_usec))
420 err = -EFAULT;
421 }
422 return err;
423 }
424
compat_sock_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)425 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
426 char __user *optval, int __user *optlen)
427 {
428 if (!COMPAT_USE_64BIT_TIME &&
429 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
430 return do_get_sock_timeout(sock, level, optname, optval, optlen);
431 return sock_getsockopt(sock, level, optname, optval, optlen);
432 }
433
compat_sock_get_timestamp(struct sock * sk,struct timeval __user * userstamp)434 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
435 {
436 struct compat_timeval __user *ctv;
437 int err;
438 struct timeval tv;
439
440 if (COMPAT_USE_64BIT_TIME)
441 return sock_get_timestamp(sk, userstamp);
442
443 ctv = (struct compat_timeval __user *) userstamp;
444 err = -ENOENT;
445 if (!sock_flag(sk, SOCK_TIMESTAMP))
446 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
447 tv = ktime_to_timeval(sock_read_timestamp(sk));
448
449 if (tv.tv_sec == -1)
450 return err;
451 if (tv.tv_sec == 0) {
452 ktime_t kt = ktime_get_real();
453 sock_write_timestamp(sk, kt);
454 tv = ktime_to_timeval(kt);
455 }
456 err = 0;
457 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
458 put_user(tv.tv_usec, &ctv->tv_usec))
459 err = -EFAULT;
460 return err;
461 }
462 EXPORT_SYMBOL(compat_sock_get_timestamp);
463
compat_sock_get_timestampns(struct sock * sk,struct timespec __user * userstamp)464 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
465 {
466 struct compat_timespec __user *ctv;
467 int err;
468 struct timespec ts;
469
470 if (COMPAT_USE_64BIT_TIME)
471 return sock_get_timestampns (sk, userstamp);
472
473 ctv = (struct compat_timespec __user *) userstamp;
474 err = -ENOENT;
475 if (!sock_flag(sk, SOCK_TIMESTAMP))
476 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
477 ts = ktime_to_timespec(sock_read_timestamp(sk));
478 if (ts.tv_sec == -1)
479 return err;
480 if (ts.tv_sec == 0) {
481 ktime_t kt = ktime_get_real();
482 sock_write_timestamp(sk, kt);
483 ts = ktime_to_timespec(kt);
484 }
485 err = 0;
486 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
487 put_user(ts.tv_nsec, &ctv->tv_nsec))
488 err = -EFAULT;
489 return err;
490 }
491 EXPORT_SYMBOL(compat_sock_get_timestampns);
492
COMPAT_SYSCALL_DEFINE5(getsockopt,int,fd,int,level,int,optname,char __user *,optval,int __user *,optlen)493 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
494 char __user *, optval, int __user *, optlen)
495 {
496 int err;
497 struct socket *sock = sockfd_lookup(fd, &err);
498
499 if (sock) {
500 err = security_socket_getsockopt(sock, level, optname);
501 if (err) {
502 sockfd_put(sock);
503 return err;
504 }
505
506 if (level == SOL_SOCKET)
507 err = compat_sock_getsockopt(sock, level,
508 optname, optval, optlen);
509 else if (sock->ops->compat_getsockopt)
510 err = sock->ops->compat_getsockopt(sock, level,
511 optname, optval, optlen);
512 else
513 err = sock->ops->getsockopt(sock, level,
514 optname, optval, optlen);
515 sockfd_put(sock);
516 }
517 return err;
518 }
519
520 struct compat_group_req {
521 __u32 gr_interface;
522 struct __kernel_sockaddr_storage gr_group
523 __aligned(4);
524 } __packed;
525
526 struct compat_group_source_req {
527 __u32 gsr_interface;
528 struct __kernel_sockaddr_storage gsr_group
529 __aligned(4);
530 struct __kernel_sockaddr_storage gsr_source
531 __aligned(4);
532 } __packed;
533
534 struct compat_group_filter {
535 __u32 gf_interface;
536 struct __kernel_sockaddr_storage gf_group
537 __aligned(4);
538 __u32 gf_fmode;
539 __u32 gf_numsrc;
540 struct __kernel_sockaddr_storage gf_slist[1]
541 __aligned(4);
542 } __packed;
543
544 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
545 sizeof(struct __kernel_sockaddr_storage))
546
547
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))548 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
549 char __user *optval, unsigned int optlen,
550 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
551 {
552 char __user *koptval = optval;
553 int koptlen = optlen;
554
555 switch (optname) {
556 case MCAST_JOIN_GROUP:
557 case MCAST_LEAVE_GROUP:
558 {
559 struct compat_group_req __user *gr32 = (void *)optval;
560 struct group_req __user *kgr =
561 compat_alloc_user_space(sizeof(struct group_req));
562 u32 interface;
563
564 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
565 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
566 __get_user(interface, &gr32->gr_interface) ||
567 __put_user(interface, &kgr->gr_interface) ||
568 copy_in_user(&kgr->gr_group, &gr32->gr_group,
569 sizeof(kgr->gr_group)))
570 return -EFAULT;
571 koptval = (char __user *)kgr;
572 koptlen = sizeof(struct group_req);
573 break;
574 }
575 case MCAST_JOIN_SOURCE_GROUP:
576 case MCAST_LEAVE_SOURCE_GROUP:
577 case MCAST_BLOCK_SOURCE:
578 case MCAST_UNBLOCK_SOURCE:
579 {
580 struct compat_group_source_req __user *gsr32 = (void *)optval;
581 struct group_source_req __user *kgsr = compat_alloc_user_space(
582 sizeof(struct group_source_req));
583 u32 interface;
584
585 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
586 !access_ok(VERIFY_WRITE, kgsr,
587 sizeof(struct group_source_req)) ||
588 __get_user(interface, &gsr32->gsr_interface) ||
589 __put_user(interface, &kgsr->gsr_interface) ||
590 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
591 sizeof(kgsr->gsr_group)) ||
592 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
593 sizeof(kgsr->gsr_source)))
594 return -EFAULT;
595 koptval = (char __user *)kgsr;
596 koptlen = sizeof(struct group_source_req);
597 break;
598 }
599 case MCAST_MSFILTER:
600 {
601 struct compat_group_filter __user *gf32 = (void *)optval;
602 struct group_filter __user *kgf;
603 u32 interface, fmode, numsrc;
604
605 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
606 __get_user(interface, &gf32->gf_interface) ||
607 __get_user(fmode, &gf32->gf_fmode) ||
608 __get_user(numsrc, &gf32->gf_numsrc))
609 return -EFAULT;
610 koptlen = optlen + sizeof(struct group_filter) -
611 sizeof(struct compat_group_filter);
612 if (koptlen < GROUP_FILTER_SIZE(numsrc))
613 return -EINVAL;
614 kgf = compat_alloc_user_space(koptlen);
615 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
616 __put_user(interface, &kgf->gf_interface) ||
617 __put_user(fmode, &kgf->gf_fmode) ||
618 __put_user(numsrc, &kgf->gf_numsrc) ||
619 copy_in_user(&kgf->gf_group, &gf32->gf_group,
620 sizeof(kgf->gf_group)) ||
621 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
622 numsrc * sizeof(kgf->gf_slist[0]))))
623 return -EFAULT;
624 koptval = (char __user *)kgf;
625 break;
626 }
627
628 default:
629 break;
630 }
631 return setsockopt(sock, level, optname, koptval, koptlen);
632 }
633 EXPORT_SYMBOL(compat_mc_setsockopt);
634
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 *))635 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
636 char __user *optval, int __user *optlen,
637 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
638 {
639 struct compat_group_filter __user *gf32 = (void *)optval;
640 struct group_filter __user *kgf;
641 int __user *koptlen;
642 u32 interface, fmode, numsrc;
643 int klen, ulen, err;
644
645 if (optname != MCAST_MSFILTER)
646 return getsockopt(sock, level, optname, optval, optlen);
647
648 koptlen = compat_alloc_user_space(sizeof(*koptlen));
649 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
650 __get_user(ulen, optlen))
651 return -EFAULT;
652
653 /* adjust len for pad */
654 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
655
656 if (klen < GROUP_FILTER_SIZE(0))
657 return -EINVAL;
658
659 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
660 __put_user(klen, koptlen))
661 return -EFAULT;
662
663 /* have to allow space for previous compat_alloc_user_space, too */
664 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
665
666 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
667 __get_user(interface, &gf32->gf_interface) ||
668 __get_user(fmode, &gf32->gf_fmode) ||
669 __get_user(numsrc, &gf32->gf_numsrc) ||
670 __put_user(interface, &kgf->gf_interface) ||
671 __put_user(fmode, &kgf->gf_fmode) ||
672 __put_user(numsrc, &kgf->gf_numsrc) ||
673 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
674 return -EFAULT;
675
676 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
677 if (err)
678 return err;
679
680 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
681 __get_user(klen, koptlen))
682 return -EFAULT;
683
684 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
685
686 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
687 __put_user(ulen, optlen))
688 return -EFAULT;
689
690 if (!access_ok(VERIFY_READ, kgf, klen) ||
691 !access_ok(VERIFY_WRITE, gf32, ulen) ||
692 __get_user(interface, &kgf->gf_interface) ||
693 __get_user(fmode, &kgf->gf_fmode) ||
694 __get_user(numsrc, &kgf->gf_numsrc) ||
695 __put_user(interface, &gf32->gf_interface) ||
696 __put_user(fmode, &gf32->gf_fmode) ||
697 __put_user(numsrc, &gf32->gf_numsrc))
698 return -EFAULT;
699 if (numsrc) {
700 int copylen;
701
702 klen -= GROUP_FILTER_SIZE(0);
703 copylen = numsrc * sizeof(gf32->gf_slist[0]);
704 if (copylen > klen)
705 copylen = klen;
706 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
707 return -EFAULT;
708 }
709 return err;
710 }
711 EXPORT_SYMBOL(compat_mc_getsockopt);
712
713
714 /* Argument list sizes for compat_sys_socketcall */
715 #define AL(x) ((x) * sizeof(u32))
716 static unsigned char nas[21] = {
717 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
718 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
719 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
720 AL(4), AL(5), AL(4)
721 };
722 #undef AL
723
COMPAT_SYSCALL_DEFINE3(sendmsg,int,fd,struct compat_msghdr __user *,msg,unsigned int,flags)724 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
725 {
726 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
727 }
728
COMPAT_SYSCALL_DEFINE4(sendmmsg,int,fd,struct compat_mmsghdr __user *,mmsg,unsigned int,vlen,unsigned int,flags)729 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
730 unsigned int, vlen, unsigned int, flags)
731 {
732 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
733 flags | MSG_CMSG_COMPAT);
734 }
735
COMPAT_SYSCALL_DEFINE3(recvmsg,int,fd,struct compat_msghdr __user *,msg,unsigned int,flags)736 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
737 {
738 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
739 }
740
COMPAT_SYSCALL_DEFINE4(recv,int,fd,void __user *,buf,compat_size_t,len,unsigned int,flags)741 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
742 {
743 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
744 }
745
COMPAT_SYSCALL_DEFINE6(recvfrom,int,fd,void __user *,buf,compat_size_t,len,unsigned int,flags,struct sockaddr __user *,addr,int __user *,addrlen)746 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
747 unsigned int, flags, struct sockaddr __user *, addr,
748 int __user *, addrlen)
749 {
750 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
751 }
752
COMPAT_SYSCALL_DEFINE5(recvmmsg,int,fd,struct compat_mmsghdr __user *,mmsg,unsigned int,vlen,unsigned int,flags,struct compat_timespec __user *,timeout)753 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
754 unsigned int, vlen, unsigned int, flags,
755 struct compat_timespec __user *, timeout)
756 {
757 int datagrams;
758 struct timespec ktspec;
759
760 if (timeout == NULL)
761 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
762 flags | MSG_CMSG_COMPAT, NULL);
763
764 if (compat_get_timespec(&ktspec, timeout))
765 return -EFAULT;
766
767 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
768 flags | MSG_CMSG_COMPAT, &ktspec);
769 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
770 datagrams = -EFAULT;
771
772 return datagrams;
773 }
774
COMPAT_SYSCALL_DEFINE2(socketcall,int,call,u32 __user *,args)775 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
776 {
777 u32 a[AUDITSC_ARGS];
778 unsigned int len;
779 u32 a0, a1;
780 int ret;
781
782 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
783 return -EINVAL;
784 len = nas[call];
785 if (len > sizeof(a))
786 return -EINVAL;
787
788 if (copy_from_user(a, args, len))
789 return -EFAULT;
790
791 ret = audit_socketcall_compat(len / sizeof(a[0]), a);
792 if (ret)
793 return ret;
794
795 a0 = a[0];
796 a1 = a[1];
797
798 switch (call) {
799 case SYS_SOCKET:
800 ret = sys_socket(a0, a1, a[2]);
801 break;
802 case SYS_BIND:
803 ret = sys_bind(a0, compat_ptr(a1), a[2]);
804 break;
805 case SYS_CONNECT:
806 ret = sys_connect(a0, compat_ptr(a1), a[2]);
807 break;
808 case SYS_LISTEN:
809 ret = sys_listen(a0, a1);
810 break;
811 case SYS_ACCEPT:
812 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
813 break;
814 case SYS_GETSOCKNAME:
815 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
816 break;
817 case SYS_GETPEERNAME:
818 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
819 break;
820 case SYS_SOCKETPAIR:
821 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
822 break;
823 case SYS_SEND:
824 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
825 break;
826 case SYS_SENDTO:
827 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
828 break;
829 case SYS_RECV:
830 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
831 break;
832 case SYS_RECVFROM:
833 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
834 compat_ptr(a[4]), compat_ptr(a[5]));
835 break;
836 case SYS_SHUTDOWN:
837 ret = sys_shutdown(a0, a1);
838 break;
839 case SYS_SETSOCKOPT:
840 ret = compat_sys_setsockopt(a0, a1, a[2],
841 compat_ptr(a[3]), a[4]);
842 break;
843 case SYS_GETSOCKOPT:
844 ret = compat_sys_getsockopt(a0, a1, a[2],
845 compat_ptr(a[3]), compat_ptr(a[4]));
846 break;
847 case SYS_SENDMSG:
848 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
849 break;
850 case SYS_SENDMMSG:
851 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
852 break;
853 case SYS_RECVMSG:
854 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
855 break;
856 case SYS_RECVMMSG:
857 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
858 compat_ptr(a[4]));
859 break;
860 case SYS_ACCEPT4:
861 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
862 break;
863 default:
864 ret = -EINVAL;
865 break;
866 }
867 return ret;
868 }
869