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
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 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
cmsg_compat_nxthdr(struct msghdr * msg,struct compat_cmsghdr __user * cmsg,int cmsg_len)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 */
cmsghdr_from_user_compat_to_kern(struct msghdr * kmsg,struct sock * sk,unsigned char * stackbuf,int stackbuf_size)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 /*
189 * check the length of messages copied in is the same as the
190 * what we get from the first loop
191 */
192 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
193 goto Einval;
194
195 /* Ok, looks like we made it. Hook it up and return success. */
196 kmsg->msg_control = kcmsg_base;
197 kmsg->msg_controllen = kcmlen;
198 return 0;
199
200 Einval:
201 err = -EINVAL;
202 Efault:
203 if (kcmsg_base != (struct cmsghdr *)stackbuf)
204 sock_kfree_s(sk, kcmsg_base, kcmlen);
205 return err;
206 }
207
put_cmsg_compat(struct msghdr * kmsg,int level,int type,int len,void * data)208 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
209 {
210 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
211 struct compat_cmsghdr cmhdr;
212 struct compat_timeval ctv;
213 struct compat_timespec cts[3];
214 int cmlen;
215
216 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
217 kmsg->msg_flags |= MSG_CTRUNC;
218 return 0; /* XXX: return error? check spec. */
219 }
220
221 if (!COMPAT_USE_64BIT_TIME) {
222 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
223 struct timeval *tv = (struct timeval *)data;
224 ctv.tv_sec = tv->tv_sec;
225 ctv.tv_usec = tv->tv_usec;
226 data = &ctv;
227 len = sizeof(ctv);
228 }
229 if (level == SOL_SOCKET &&
230 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
231 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
232 int i;
233 struct timespec *ts = (struct timespec *)data;
234 for (i = 0; i < count; i++) {
235 cts[i].tv_sec = ts[i].tv_sec;
236 cts[i].tv_nsec = ts[i].tv_nsec;
237 }
238 data = &cts;
239 len = sizeof(cts[0]) * count;
240 }
241 }
242
243 cmlen = CMSG_COMPAT_LEN(len);
244 if (kmsg->msg_controllen < cmlen) {
245 kmsg->msg_flags |= MSG_CTRUNC;
246 cmlen = kmsg->msg_controllen;
247 }
248 cmhdr.cmsg_level = level;
249 cmhdr.cmsg_type = type;
250 cmhdr.cmsg_len = cmlen;
251
252 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
253 return -EFAULT;
254 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
255 return -EFAULT;
256 cmlen = CMSG_COMPAT_SPACE(len);
257 if (kmsg->msg_controllen < cmlen)
258 cmlen = kmsg->msg_controllen;
259 kmsg->msg_control += cmlen;
260 kmsg->msg_controllen -= cmlen;
261 return 0;
262 }
263
scm_detach_fds_compat(struct msghdr * kmsg,struct scm_cookie * scm)264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
265 {
266 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
267 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
268 int fdnum = scm->fp->count;
269 struct file **fp = scm->fp->fp;
270 int __user *cmfptr;
271 int err = 0, i;
272
273 if (fdnum < fdmax)
274 fdmax = fdnum;
275
276 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
277 int new_fd;
278 err = security_file_receive(fp[i]);
279 if (err)
280 break;
281 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
282 ? O_CLOEXEC : 0);
283 if (err < 0)
284 break;
285 new_fd = err;
286 err = put_user(new_fd, cmfptr);
287 if (err) {
288 put_unused_fd(new_fd);
289 break;
290 }
291 /* Bump the usage count and install the file. */
292 __receive_sock(fp[i]);
293 fd_install(new_fd, get_file(fp[i]));
294 }
295
296 if (i > 0) {
297 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
298 err = put_user(SOL_SOCKET, &cm->cmsg_level);
299 if (!err)
300 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
301 if (!err)
302 err = put_user(cmlen, &cm->cmsg_len);
303 if (!err) {
304 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
305 kmsg->msg_control += cmlen;
306 kmsg->msg_controllen -= cmlen;
307 }
308 }
309 if (i < fdnum)
310 kmsg->msg_flags |= MSG_CTRUNC;
311
312 /*
313 * All of the files that fit in the message have had their
314 * usage counts incremented, so we just free the list.
315 */
316 __scm_destroy(scm);
317 }
318
319 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
get_compat_bpf_fprog(char __user * optval)320 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
321 {
322 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
323 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
324 struct compat_sock_fprog f32;
325 struct sock_fprog f;
326
327 if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
328 return NULL;
329 memset(&f, 0, sizeof(f));
330 f.len = f32.len;
331 f.filter = compat_ptr(f32.filter);
332 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
333 return NULL;
334
335 return kfprog;
336 }
337 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
338
do_set_attach_filter(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)339 static int do_set_attach_filter(struct socket *sock, int level, int optname,
340 char __user *optval, unsigned int optlen)
341 {
342 struct sock_fprog __user *kfprog;
343
344 kfprog = get_compat_bpf_fprog(optval);
345 if (!kfprog)
346 return -EFAULT;
347
348 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
349 sizeof(struct sock_fprog));
350 }
351
do_set_sock_timeout(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)352 static int do_set_sock_timeout(struct socket *sock, int level,
353 int optname, char __user *optval, unsigned int optlen)
354 {
355 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
356 struct timeval ktime;
357 mm_segment_t old_fs;
358 int err;
359
360 if (optlen < sizeof(*up))
361 return -EINVAL;
362 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
363 __get_user(ktime.tv_sec, &up->tv_sec) ||
364 __get_user(ktime.tv_usec, &up->tv_usec))
365 return -EFAULT;
366 old_fs = get_fs();
367 set_fs(KERNEL_DS);
368 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
369 set_fs(old_fs);
370
371 return err;
372 }
373
compat_sock_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)374 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
375 char __user *optval, unsigned int optlen)
376 {
377 if (optname == SO_ATTACH_FILTER ||
378 optname == SO_ATTACH_REUSEPORT_CBPF)
379 return do_set_attach_filter(sock, level, optname,
380 optval, optlen);
381 if (!COMPAT_USE_64BIT_TIME &&
382 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
383 return do_set_sock_timeout(sock, level, optname, optval, optlen);
384
385 return sock_setsockopt(sock, level, optname, optval, optlen);
386 }
387
__compat_sys_setsockopt(int fd,int level,int optname,char __user * optval,unsigned int optlen)388 static int __compat_sys_setsockopt(int fd, int level, int optname,
389 char __user *optval, unsigned int optlen)
390 {
391 int err;
392 struct socket *sock = sockfd_lookup(fd, &err);
393
394 if (sock) {
395 err = security_socket_setsockopt(sock, level, optname);
396 if (err) {
397 sockfd_put(sock);
398 return err;
399 }
400
401 if (level == SOL_SOCKET)
402 err = compat_sock_setsockopt(sock, level,
403 optname, optval, optlen);
404 else if (sock->ops->compat_setsockopt)
405 err = sock->ops->compat_setsockopt(sock, level,
406 optname, optval, optlen);
407 else
408 err = sock->ops->setsockopt(sock, level,
409 optname, optval, optlen);
410 sockfd_put(sock);
411 }
412 return err;
413 }
414
COMPAT_SYSCALL_DEFINE5(setsockopt,int,fd,int,level,int,optname,char __user *,optval,unsigned int,optlen)415 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
416 char __user *, optval, unsigned int, optlen)
417 {
418 return __compat_sys_setsockopt(fd, level, optname, optval, optlen);
419 }
420
do_get_sock_timeout(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)421 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
422 char __user *optval, int __user *optlen)
423 {
424 struct compat_timeval __user *up;
425 struct timeval ktime;
426 mm_segment_t old_fs;
427 int len, err;
428
429 up = (struct compat_timeval __user *) optval;
430 if (get_user(len, optlen))
431 return -EFAULT;
432 if (len < sizeof(*up))
433 return -EINVAL;
434 len = sizeof(ktime);
435 old_fs = get_fs();
436 set_fs(KERNEL_DS);
437 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
438 set_fs(old_fs);
439
440 if (!err) {
441 if (put_user(sizeof(*up), optlen) ||
442 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
443 __put_user(ktime.tv_sec, &up->tv_sec) ||
444 __put_user(ktime.tv_usec, &up->tv_usec))
445 err = -EFAULT;
446 }
447 return err;
448 }
449
compat_sock_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)450 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
451 char __user *optval, int __user *optlen)
452 {
453 if (!COMPAT_USE_64BIT_TIME &&
454 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
455 return do_get_sock_timeout(sock, level, optname, optval, optlen);
456 return sock_getsockopt(sock, level, optname, optval, optlen);
457 }
458
compat_sock_get_timestamp(struct sock * sk,struct timeval __user * userstamp)459 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
460 {
461 struct compat_timeval __user *ctv;
462 int err;
463 struct timeval tv;
464
465 if (COMPAT_USE_64BIT_TIME)
466 return sock_get_timestamp(sk, userstamp);
467
468 ctv = (struct compat_timeval __user *) userstamp;
469 err = -ENOENT;
470 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
471 tv = ktime_to_timeval(sock_read_timestamp(sk));
472
473 if (tv.tv_sec == -1)
474 return err;
475 if (tv.tv_sec == 0) {
476 ktime_t kt = ktime_get_real();
477 sock_write_timestamp(sk, kt);
478 tv = ktime_to_timeval(kt);
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 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
500 ts = ktime_to_timespec(sock_read_timestamp(sk));
501 if (ts.tv_sec == -1)
502 return err;
503 if (ts.tv_sec == 0) {
504 ktime_t kt = ktime_get_real();
505 sock_write_timestamp(sk, kt);
506 ts = ktime_to_timespec(kt);
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 static int __compat_sys_getsockopt(int fd, int level, int optname,
517 char __user *optval,
518 int __user *optlen)
519 {
520 int err;
521 struct socket *sock = sockfd_lookup(fd, &err);
522
523 if (sock) {
524 err = security_socket_getsockopt(sock, level, optname);
525 if (err) {
526 sockfd_put(sock);
527 return err;
528 }
529
530 if (level == SOL_SOCKET)
531 err = compat_sock_getsockopt(sock, level,
532 optname, optval, optlen);
533 else if (sock->ops->compat_getsockopt)
534 err = sock->ops->compat_getsockopt(sock, level,
535 optname, optval, optlen);
536 else
537 err = sock->ops->getsockopt(sock, level,
538 optname, optval, optlen);
539 sockfd_put(sock);
540 }
541 return err;
542 }
543
COMPAT_SYSCALL_DEFINE5(getsockopt,int,fd,int,level,int,optname,char __user *,optval,int __user *,optlen)544 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
545 char __user *, optval, int __user *, optlen)
546 {
547 return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
548 }
549
550 struct compat_group_req {
551 __u32 gr_interface;
552 struct __kernel_sockaddr_storage gr_group
553 __aligned(4);
554 } __packed;
555
556 struct compat_group_source_req {
557 __u32 gsr_interface;
558 struct __kernel_sockaddr_storage gsr_group
559 __aligned(4);
560 struct __kernel_sockaddr_storage gsr_source
561 __aligned(4);
562 } __packed;
563
564 struct compat_group_filter {
565 __u32 gf_interface;
566 struct __kernel_sockaddr_storage gf_group
567 __aligned(4);
568 __u32 gf_fmode;
569 __u32 gf_numsrc;
570 struct __kernel_sockaddr_storage gf_slist[1]
571 __aligned(4);
572 } __packed;
573
574 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
575 sizeof(struct __kernel_sockaddr_storage))
576
577
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))578 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
579 char __user *optval, unsigned int optlen,
580 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
581 {
582 char __user *koptval = optval;
583 int koptlen = optlen;
584
585 switch (optname) {
586 case MCAST_JOIN_GROUP:
587 case MCAST_LEAVE_GROUP:
588 {
589 struct compat_group_req __user *gr32 = (void *)optval;
590 struct group_req __user *kgr =
591 compat_alloc_user_space(sizeof(struct group_req));
592 u32 interface;
593
594 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
595 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
596 __get_user(interface, &gr32->gr_interface) ||
597 __put_user(interface, &kgr->gr_interface) ||
598 copy_in_user(&kgr->gr_group, &gr32->gr_group,
599 sizeof(kgr->gr_group)))
600 return -EFAULT;
601 koptval = (char __user *)kgr;
602 koptlen = sizeof(struct group_req);
603 break;
604 }
605 case MCAST_JOIN_SOURCE_GROUP:
606 case MCAST_LEAVE_SOURCE_GROUP:
607 case MCAST_BLOCK_SOURCE:
608 case MCAST_UNBLOCK_SOURCE:
609 {
610 struct compat_group_source_req __user *gsr32 = (void *)optval;
611 struct group_source_req __user *kgsr = compat_alloc_user_space(
612 sizeof(struct group_source_req));
613 u32 interface;
614
615 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
616 !access_ok(VERIFY_WRITE, kgsr,
617 sizeof(struct group_source_req)) ||
618 __get_user(interface, &gsr32->gsr_interface) ||
619 __put_user(interface, &kgsr->gsr_interface) ||
620 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
621 sizeof(kgsr->gsr_group)) ||
622 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
623 sizeof(kgsr->gsr_source)))
624 return -EFAULT;
625 koptval = (char __user *)kgsr;
626 koptlen = sizeof(struct group_source_req);
627 break;
628 }
629 case MCAST_MSFILTER:
630 {
631 struct compat_group_filter __user *gf32 = (void *)optval;
632 struct group_filter __user *kgf;
633 u32 interface, fmode, numsrc;
634
635 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
636 __get_user(interface, &gf32->gf_interface) ||
637 __get_user(fmode, &gf32->gf_fmode) ||
638 __get_user(numsrc, &gf32->gf_numsrc))
639 return -EFAULT;
640 koptlen = optlen + sizeof(struct group_filter) -
641 sizeof(struct compat_group_filter);
642 if (koptlen < GROUP_FILTER_SIZE(numsrc))
643 return -EINVAL;
644 kgf = compat_alloc_user_space(koptlen);
645 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
646 __put_user(interface, &kgf->gf_interface) ||
647 __put_user(fmode, &kgf->gf_fmode) ||
648 __put_user(numsrc, &kgf->gf_numsrc) ||
649 copy_in_user(&kgf->gf_group, &gf32->gf_group,
650 sizeof(kgf->gf_group)) ||
651 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
652 numsrc * sizeof(kgf->gf_slist[0]))))
653 return -EFAULT;
654 koptval = (char __user *)kgf;
655 break;
656 }
657
658 default:
659 break;
660 }
661 return setsockopt(sock, level, optname, koptval, koptlen);
662 }
663 EXPORT_SYMBOL(compat_mc_setsockopt);
664
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 *))665 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
666 char __user *optval, int __user *optlen,
667 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
668 {
669 struct compat_group_filter __user *gf32 = (void *)optval;
670 struct group_filter __user *kgf;
671 int __user *koptlen;
672 u32 interface, fmode, numsrc;
673 int klen, ulen, err;
674
675 if (optname != MCAST_MSFILTER)
676 return getsockopt(sock, level, optname, optval, optlen);
677
678 koptlen = compat_alloc_user_space(sizeof(*koptlen));
679 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
680 __get_user(ulen, optlen))
681 return -EFAULT;
682
683 /* adjust len for pad */
684 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
685
686 if (klen < GROUP_FILTER_SIZE(0))
687 return -EINVAL;
688
689 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
690 __put_user(klen, koptlen))
691 return -EFAULT;
692
693 /* have to allow space for previous compat_alloc_user_space, too */
694 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
695
696 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
697 __get_user(interface, &gf32->gf_interface) ||
698 __get_user(fmode, &gf32->gf_fmode) ||
699 __get_user(numsrc, &gf32->gf_numsrc) ||
700 __put_user(interface, &kgf->gf_interface) ||
701 __put_user(fmode, &kgf->gf_fmode) ||
702 __put_user(numsrc, &kgf->gf_numsrc) ||
703 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
704 return -EFAULT;
705
706 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
707 if (err)
708 return err;
709
710 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
711 __get_user(klen, koptlen))
712 return -EFAULT;
713
714 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
715
716 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
717 __put_user(ulen, optlen))
718 return -EFAULT;
719
720 if (!access_ok(VERIFY_READ, kgf, klen) ||
721 !access_ok(VERIFY_WRITE, gf32, ulen) ||
722 __get_user(interface, &kgf->gf_interface) ||
723 __get_user(fmode, &kgf->gf_fmode) ||
724 __get_user(numsrc, &kgf->gf_numsrc) ||
725 __put_user(interface, &gf32->gf_interface) ||
726 __put_user(fmode, &gf32->gf_fmode) ||
727 __put_user(numsrc, &gf32->gf_numsrc))
728 return -EFAULT;
729 if (numsrc) {
730 int copylen;
731
732 klen -= GROUP_FILTER_SIZE(0);
733 copylen = numsrc * sizeof(gf32->gf_slist[0]);
734 if (copylen > klen)
735 copylen = klen;
736 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
737 return -EFAULT;
738 }
739 return err;
740 }
741 EXPORT_SYMBOL(compat_mc_getsockopt);
742
743
744 /* Argument list sizes for compat_sys_socketcall */
745 #define AL(x) ((x) * sizeof(u32))
746 static unsigned char nas[21] = {
747 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
748 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
749 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
750 AL(4), AL(5), AL(4)
751 };
752 #undef AL
753
__compat_sys_sendmsg(int fd,struct compat_msghdr __user * msg,unsigned int flags)754 static inline long __compat_sys_sendmsg(int fd,
755 struct compat_msghdr __user *msg,
756 unsigned int flags)
757 {
758 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
759 flags | MSG_CMSG_COMPAT, false);
760 }
761
COMPAT_SYSCALL_DEFINE3(sendmsg,int,fd,struct compat_msghdr __user *,msg,unsigned int,flags)762 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
763 unsigned int, flags)
764 {
765 return __compat_sys_sendmsg(fd, msg, flags);
766 }
767
__compat_sys_sendmmsg(int fd,struct compat_mmsghdr __user * mmsg,unsigned int vlen,unsigned int flags)768 static inline long __compat_sys_sendmmsg(int fd,
769 struct compat_mmsghdr __user *mmsg,
770 unsigned int vlen, unsigned int flags)
771 {
772 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
773 flags | MSG_CMSG_COMPAT, false);
774 }
775
COMPAT_SYSCALL_DEFINE4(sendmmsg,int,fd,struct compat_mmsghdr __user *,mmsg,unsigned int,vlen,unsigned int,flags)776 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
777 unsigned int, vlen, unsigned int, flags)
778 {
779 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
780 }
781
__compat_sys_recvmsg(int fd,struct compat_msghdr __user * msg,unsigned int flags)782 static inline long __compat_sys_recvmsg(int fd,
783 struct compat_msghdr __user *msg,
784 unsigned int flags)
785 {
786 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
787 flags | MSG_CMSG_COMPAT, false);
788 }
789
COMPAT_SYSCALL_DEFINE3(recvmsg,int,fd,struct compat_msghdr __user *,msg,unsigned int,flags)790 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
791 unsigned int, flags)
792 {
793 return __compat_sys_recvmsg(fd, msg, flags);
794 }
795
__compat_sys_recvfrom(int fd,void __user * buf,compat_size_t len,unsigned int flags,struct sockaddr __user * addr,int __user * addrlen)796 static inline long __compat_sys_recvfrom(int fd, void __user *buf,
797 compat_size_t len, unsigned int flags,
798 struct sockaddr __user *addr,
799 int __user *addrlen)
800 {
801 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
802 addrlen);
803 }
804
COMPAT_SYSCALL_DEFINE4(recv,int,fd,void __user *,buf,compat_size_t,len,unsigned int,flags)805 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
806 {
807 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
808 }
809
COMPAT_SYSCALL_DEFINE6(recvfrom,int,fd,void __user *,buf,compat_size_t,len,unsigned int,flags,struct sockaddr __user *,addr,int __user *,addrlen)810 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
811 unsigned int, flags, struct sockaddr __user *, addr,
812 int __user *, addrlen)
813 {
814 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
815 }
816
__compat_sys_recvmmsg(int fd,struct compat_mmsghdr __user * mmsg,unsigned int vlen,unsigned int flags,struct compat_timespec __user * timeout)817 static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
818 unsigned int vlen, unsigned int flags,
819 struct compat_timespec __user *timeout)
820 {
821 int datagrams;
822 struct timespec ktspec;
823
824 if (timeout == NULL)
825 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
826 flags | MSG_CMSG_COMPAT, NULL);
827
828 if (compat_get_timespec(&ktspec, timeout))
829 return -EFAULT;
830
831 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
832 flags | MSG_CMSG_COMPAT, &ktspec);
833 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
834 datagrams = -EFAULT;
835
836 return datagrams;
837 }
838
COMPAT_SYSCALL_DEFINE5(recvmmsg,int,fd,struct compat_mmsghdr __user *,mmsg,unsigned int,vlen,unsigned int,flags,struct compat_timespec __user *,timeout)839 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
840 unsigned int, vlen, unsigned int, flags,
841 struct compat_timespec __user *, timeout)
842 {
843 return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
844 }
845
COMPAT_SYSCALL_DEFINE2(socketcall,int,call,u32 __user *,args)846 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
847 {
848 u32 a[AUDITSC_ARGS];
849 unsigned int len;
850 u32 a0, a1;
851 int ret;
852
853 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
854 return -EINVAL;
855 len = nas[call];
856 if (len > sizeof(a))
857 return -EINVAL;
858
859 if (copy_from_user(a, args, len))
860 return -EFAULT;
861
862 ret = audit_socketcall_compat(len / sizeof(a[0]), a);
863 if (ret)
864 return ret;
865
866 a0 = a[0];
867 a1 = a[1];
868
869 switch (call) {
870 case SYS_SOCKET:
871 ret = __sys_socket(a0, a1, a[2]);
872 break;
873 case SYS_BIND:
874 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
875 break;
876 case SYS_CONNECT:
877 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
878 break;
879 case SYS_LISTEN:
880 ret = __sys_listen(a0, a1);
881 break;
882 case SYS_ACCEPT:
883 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
884 break;
885 case SYS_GETSOCKNAME:
886 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
887 break;
888 case SYS_GETPEERNAME:
889 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
890 break;
891 case SYS_SOCKETPAIR:
892 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
893 break;
894 case SYS_SEND:
895 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
896 break;
897 case SYS_SENDTO:
898 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
899 compat_ptr(a[4]), a[5]);
900 break;
901 case SYS_RECV:
902 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
903 NULL, NULL);
904 break;
905 case SYS_RECVFROM:
906 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
907 compat_ptr(a[4]),
908 compat_ptr(a[5]));
909 break;
910 case SYS_SHUTDOWN:
911 ret = __sys_shutdown(a0, a1);
912 break;
913 case SYS_SETSOCKOPT:
914 ret = __compat_sys_setsockopt(a0, a1, a[2],
915 compat_ptr(a[3]), a[4]);
916 break;
917 case SYS_GETSOCKOPT:
918 ret = __compat_sys_getsockopt(a0, a1, a[2],
919 compat_ptr(a[3]),
920 compat_ptr(a[4]));
921 break;
922 case SYS_SENDMSG:
923 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
924 break;
925 case SYS_SENDMMSG:
926 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
927 break;
928 case SYS_RECVMSG:
929 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
930 break;
931 case SYS_RECVMMSG:
932 ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
933 compat_ptr(a[4]));
934 break;
935 case SYS_ACCEPT4:
936 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
937 break;
938 default:
939 ret = -EINVAL;
940 break;
941 }
942 return ret;
943 }
944