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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 | |
26 | #include <net/scm.h> |
27 | #include <net/sock.h> |
28 | #include <net/ip.h> |
29 | #include <net/ipv6.h> |
30 | #include <asm/uaccess.h> |
31 | #include <net/compat.h> |
32 | |
33 | static inline int iov_from_user_compat_to_kern(struct iovec *kiov, |
34 | struct compat_iovec __user *uiov32, |
35 | int niov) |
36 | { |
37 | int tot_len = 0; |
38 | |
39 | while (niov > 0) { |
40 | compat_uptr_t buf; |
41 | compat_size_t len; |
42 | |
43 | if (get_user(len, &uiov32->iov_len) || |
44 | get_user(buf, &uiov32->iov_base)) |
45 | return -EFAULT; |
46 | |
47 | if (len > INT_MAX - tot_len) |
48 | len = INT_MAX - tot_len; |
49 | |
50 | tot_len += len; |
51 | kiov->iov_base = compat_ptr(buf); |
52 | kiov->iov_len = (__kernel_size_t) len; |
53 | uiov32++; |
54 | kiov++; |
55 | niov--; |
56 | } |
57 | return tot_len; |
58 | } |
59 | |
60 | int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) |
61 | { |
62 | compat_uptr_t tmp1, tmp2, tmp3; |
63 | |
64 | if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || |
65 | __get_user(tmp1, &umsg->msg_name) || |
66 | __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || |
67 | __get_user(tmp2, &umsg->msg_iov) || |
68 | __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || |
69 | __get_user(tmp3, &umsg->msg_control) || |
70 | __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || |
71 | __get_user(kmsg->msg_flags, &umsg->msg_flags)) |
72 | return -EFAULT; |
73 | kmsg->msg_name = compat_ptr(tmp1); |
74 | kmsg->msg_iov = compat_ptr(tmp2); |
75 | kmsg->msg_control = compat_ptr(tmp3); |
76 | return 0; |
77 | } |
78 | |
79 | /* I've named the args so it is easy to tell whose space the pointers are in. */ |
80 | int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, |
81 | struct sockaddr *kern_address, int mode) |
82 | { |
83 | int tot_len; |
84 | |
85 | if (kern_msg->msg_namelen) { |
86 | if (mode == VERIFY_READ) { |
87 | int err = move_addr_to_kernel(kern_msg->msg_name, |
88 | kern_msg->msg_namelen, |
89 | kern_address); |
90 | if (err < 0) |
91 | return err; |
92 | } |
93 | kern_msg->msg_name = kern_address; |
94 | } else |
95 | kern_msg->msg_name = NULL; |
96 | |
97 | tot_len = iov_from_user_compat_to_kern(kern_iov, |
98 | (struct compat_iovec __user *)kern_msg->msg_iov, |
99 | kern_msg->msg_iovlen); |
100 | if (tot_len >= 0) |
101 | kern_msg->msg_iov = kern_iov; |
102 | |
103 | return tot_len; |
104 | } |
105 | |
106 | /* Bleech... */ |
107 | #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) |
108 | |
109 | #define CMSG_COMPAT_DATA(cmsg) \ |
110 | ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) |
111 | #define CMSG_COMPAT_SPACE(len) \ |
112 | (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) |
113 | #define CMSG_COMPAT_LEN(len) \ |
114 | (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) |
115 | |
116 | #define CMSG_COMPAT_FIRSTHDR(msg) \ |
117 | (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ |
118 | (struct compat_cmsghdr __user *)((msg)->msg_control) : \ |
119 | (struct compat_cmsghdr __user *)NULL) |
120 | |
121 | #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ |
122 | ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ |
123 | (ucmlen) <= (unsigned long) \ |
124 | ((mhdr)->msg_controllen - \ |
125 | ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) |
126 | |
127 | static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, |
128 | struct compat_cmsghdr __user *cmsg, int cmsg_len) |
129 | { |
130 | char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); |
131 | if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > |
132 | msg->msg_controllen) |
133 | return NULL; |
134 | return (struct compat_cmsghdr __user *)ptr; |
135 | } |
136 | |
137 | /* There is a lot of hair here because the alignment rules (and |
138 | * thus placement) of cmsg headers and length are different for |
139 | * 32-bit apps. -DaveM |
140 | */ |
141 | int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, |
142 | unsigned char *stackbuf, int stackbuf_size) |
143 | { |
144 | struct compat_cmsghdr __user *ucmsg; |
145 | struct cmsghdr *kcmsg, *kcmsg_base; |
146 | compat_size_t ucmlen; |
147 | __kernel_size_t kcmlen, tmp; |
148 | int err = -EFAULT; |
149 | |
150 | kcmlen = 0; |
151 | kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; |
152 | ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); |
153 | while (ucmsg != NULL) { |
154 | if (get_user(ucmlen, &ucmsg->cmsg_len)) |
155 | return -EFAULT; |
156 | |
157 | /* Catch bogons. */ |
158 | if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) |
159 | return -EINVAL; |
160 | |
161 | tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + |
162 | CMSG_ALIGN(sizeof(struct cmsghdr))); |
163 | tmp = CMSG_ALIGN(tmp); |
164 | kcmlen += tmp; |
165 | ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); |
166 | } |
167 | if (kcmlen == 0) |
168 | return -EINVAL; |
169 | |
170 | /* The kcmlen holds the 64-bit version of the control length. |
171 | * It may not be modified as we do not stick it into the kmsg |
172 | * until we have successfully copied over all of the data |
173 | * from the user. |
174 | */ |
175 | if (kcmlen > stackbuf_size) |
176 | kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); |
177 | if (kcmsg == NULL) |
178 | return -ENOBUFS; |
179 | |
180 | /* Now copy them over neatly. */ |
181 | memset(kcmsg, 0, kcmlen); |
182 | ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); |
183 | while (ucmsg != NULL) { |
184 | if (__get_user(ucmlen, &ucmsg->cmsg_len)) |
185 | goto Efault; |
186 | if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) |
187 | goto Einval; |
188 | tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + |
189 | CMSG_ALIGN(sizeof(struct cmsghdr))); |
190 | if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) |
191 | goto Einval; |
192 | kcmsg->cmsg_len = tmp; |
193 | tmp = CMSG_ALIGN(tmp); |
194 | if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || |
195 | __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || |
196 | copy_from_user(CMSG_DATA(kcmsg), |
197 | CMSG_COMPAT_DATA(ucmsg), |
198 | (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) |
199 | goto Efault; |
200 | |
201 | /* Advance. */ |
202 | kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); |
203 | ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); |
204 | } |
205 | |
206 | /* Ok, looks like we made it. Hook it up and return success. */ |
207 | kmsg->msg_control = kcmsg_base; |
208 | kmsg->msg_controllen = kcmlen; |
209 | return 0; |
210 | |
211 | Einval: |
212 | err = -EINVAL; |
213 | Efault: |
214 | if (kcmsg_base != (struct cmsghdr *)stackbuf) |
215 | sock_kfree_s(sk, kcmsg_base, kcmlen); |
216 | return err; |
217 | } |
218 | |
219 | int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) |
220 | { |
221 | struct compat_timeval ctv; |
222 | struct compat_timespec cts[3]; |
223 | struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; |
224 | struct compat_cmsghdr cmhdr; |
225 | int cmlen; |
226 | |
227 | if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { |
228 | kmsg->msg_flags |= MSG_CTRUNC; |
229 | return 0; /* XXX: return error? check spec. */ |
230 | } |
231 | |
232 | if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { |
233 | struct timeval *tv = (struct timeval *)data; |
234 | ctv.tv_sec = tv->tv_sec; |
235 | ctv.tv_usec = tv->tv_usec; |
236 | data = &ctv; |
237 | len = sizeof(ctv); |
238 | } |
239 | if (level == SOL_SOCKET && |
240 | (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { |
241 | int count = type == SCM_TIMESTAMPNS ? 1 : 3; |
242 | int i; |
243 | struct timespec *ts = (struct timespec *)data; |
244 | for (i = 0; i < count; i++) { |
245 | cts[i].tv_sec = ts[i].tv_sec; |
246 | cts[i].tv_nsec = ts[i].tv_nsec; |
247 | } |
248 | data = &cts; |
249 | len = sizeof(cts[0]) * count; |
250 | } |
251 | |
252 | cmlen = CMSG_COMPAT_LEN(len); |
253 | if (kmsg->msg_controllen < cmlen) { |
254 | kmsg->msg_flags |= MSG_CTRUNC; |
255 | cmlen = kmsg->msg_controllen; |
256 | } |
257 | cmhdr.cmsg_level = level; |
258 | cmhdr.cmsg_type = type; |
259 | cmhdr.cmsg_len = cmlen; |
260 | |
261 | if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) |
262 | return -EFAULT; |
263 | if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) |
264 | return -EFAULT; |
265 | cmlen = CMSG_COMPAT_SPACE(len); |
266 | if (kmsg->msg_controllen < cmlen) |
267 | cmlen = kmsg->msg_controllen; |
268 | kmsg->msg_control += cmlen; |
269 | kmsg->msg_controllen -= cmlen; |
270 | return 0; |
271 | } |
272 | |
273 | void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) |
274 | { |
275 | struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; |
276 | int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); |
277 | int fdnum = scm->fp->count; |
278 | struct file **fp = scm->fp->fp; |
279 | int __user *cmfptr; |
280 | int err = 0, i; |
281 | |
282 | if (fdnum < fdmax) |
283 | fdmax = fdnum; |
284 | |
285 | for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { |
286 | int new_fd; |
287 | err = security_file_receive(fp[i]); |
288 | if (err) |
289 | break; |
290 | err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags |
291 | ? O_CLOEXEC : 0); |
292 | if (err < 0) |
293 | break; |
294 | new_fd = err; |
295 | err = put_user(new_fd, cmfptr); |
296 | if (err) { |
297 | put_unused_fd(new_fd); |
298 | break; |
299 | } |
300 | /* Bump the usage count and install the file. */ |
301 | get_file(fp[i]); |
302 | fd_install(new_fd, fp[i]); |
303 | } |
304 | |
305 | if (i > 0) { |
306 | int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); |
307 | err = put_user(SOL_SOCKET, &cm->cmsg_level); |
308 | if (!err) |
309 | err = put_user(SCM_RIGHTS, &cm->cmsg_type); |
310 | if (!err) |
311 | err = put_user(cmlen, &cm->cmsg_len); |
312 | if (!err) { |
313 | cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); |
314 | kmsg->msg_control += cmlen; |
315 | kmsg->msg_controllen -= cmlen; |
316 | } |
317 | } |
318 | if (i < fdnum) |
319 | kmsg->msg_flags |= MSG_CTRUNC; |
320 | |
321 | /* |
322 | * All of the files that fit in the message have had their |
323 | * usage counts incremented, so we just free the list. |
324 | */ |
325 | __scm_destroy(scm); |
326 | } |
327 | |
328 | /* |
329 | * A struct sock_filter is architecture independent. |
330 | */ |
331 | struct compat_sock_fprog { |
332 | u16 len; |
333 | compat_uptr_t filter; /* struct sock_filter * */ |
334 | }; |
335 | |
336 | static int do_set_attach_filter(struct socket *sock, int level, int optname, |
337 | char __user *optval, unsigned int optlen) |
338 | { |
339 | struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; |
340 | struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); |
341 | compat_uptr_t ptr; |
342 | u16 len; |
343 | |
344 | if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || |
345 | !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || |
346 | __get_user(len, &fprog32->len) || |
347 | __get_user(ptr, &fprog32->filter) || |
348 | __put_user(len, &kfprog->len) || |
349 | __put_user(compat_ptr(ptr), &kfprog->filter)) |
350 | return -EFAULT; |
351 | |
352 | return sock_setsockopt(sock, level, optname, (char __user *)kfprog, |
353 | sizeof(struct sock_fprog)); |
354 | } |
355 | |
356 | static int do_set_sock_timeout(struct socket *sock, int level, |
357 | int optname, char __user *optval, unsigned int optlen) |
358 | { |
359 | struct compat_timeval __user *up = (struct compat_timeval __user *)optval; |
360 | struct timeval ktime; |
361 | mm_segment_t old_fs; |
362 | int err; |
363 | |
364 | if (optlen < sizeof(*up)) |
365 | return -EINVAL; |
366 | if (!access_ok(VERIFY_READ, up, sizeof(*up)) || |
367 | __get_user(ktime.tv_sec, &up->tv_sec) || |
368 | __get_user(ktime.tv_usec, &up->tv_usec)) |
369 | return -EFAULT; |
370 | old_fs = get_fs(); |
371 | set_fs(KERNEL_DS); |
372 | err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); |
373 | set_fs(old_fs); |
374 | |
375 | return err; |
376 | } |
377 | |
378 | static int compat_sock_setsockopt(struct socket *sock, int level, int optname, |
379 | char __user *optval, unsigned int optlen) |
380 | { |
381 | if (optname == SO_ATTACH_FILTER) |
382 | return do_set_attach_filter(sock, level, optname, |
383 | optval, optlen); |
384 | if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) |
385 | return do_set_sock_timeout(sock, level, optname, optval, optlen); |
386 | |
387 | return sock_setsockopt(sock, level, optname, optval, optlen); |
388 | } |
389 | |
390 | asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, |
391 | char __user *optval, unsigned int optlen) |
392 | { |
393 | int err; |
394 | struct socket *sock = sockfd_lookup(fd, &err); |
395 | |
396 | if (sock) { |
397 | err = security_socket_setsockopt(sock, level, optname); |
398 | if (err) { |
399 | sockfd_put(sock); |
400 | return err; |
401 | } |
402 | |
403 | if (level == SOL_SOCKET) |
404 | err = compat_sock_setsockopt(sock, level, |
405 | optname, optval, optlen); |
406 | else if (sock->ops->compat_setsockopt) |
407 | err = sock->ops->compat_setsockopt(sock, level, |
408 | optname, optval, optlen); |
409 | else |
410 | err = sock->ops->setsockopt(sock, level, |
411 | optname, optval, optlen); |
412 | sockfd_put(sock); |
413 | } |
414 | return err; |
415 | } |
416 | |
417 | static int do_get_sock_timeout(struct socket *sock, int level, int optname, |
418 | char __user *optval, int __user *optlen) |
419 | { |
420 | struct compat_timeval __user *up; |
421 | struct timeval ktime; |
422 | mm_segment_t old_fs; |
423 | int len, err; |
424 | |
425 | up = (struct compat_timeval __user *) optval; |
426 | if (get_user(len, optlen)) |
427 | return -EFAULT; |
428 | if (len < sizeof(*up)) |
429 | return -EINVAL; |
430 | len = sizeof(ktime); |
431 | old_fs = get_fs(); |
432 | set_fs(KERNEL_DS); |
433 | err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); |
434 | set_fs(old_fs); |
435 | |
436 | if (!err) { |
437 | if (put_user(sizeof(*up), optlen) || |
438 | !access_ok(VERIFY_WRITE, up, sizeof(*up)) || |
439 | __put_user(ktime.tv_sec, &up->tv_sec) || |
440 | __put_user(ktime.tv_usec, &up->tv_usec)) |
441 | err = -EFAULT; |
442 | } |
443 | return err; |
444 | } |
445 | |
446 | static int compat_sock_getsockopt(struct socket *sock, int level, int optname, |
447 | char __user *optval, int __user *optlen) |
448 | { |
449 | if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) |
450 | return do_get_sock_timeout(sock, level, optname, optval, optlen); |
451 | return sock_getsockopt(sock, level, optname, optval, optlen); |
452 | } |
453 | |
454 | int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
455 | { |
456 | struct compat_timeval __user *ctv = |
457 | (struct compat_timeval __user *) userstamp; |
458 | int err = -ENOENT; |
459 | struct timeval tv; |
460 | |
461 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
462 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
463 | tv = ktime_to_timeval(sk->sk_stamp); |
464 | if (tv.tv_sec == -1) |
465 | return err; |
466 | if (tv.tv_sec == 0) { |
467 | sk->sk_stamp = ktime_get_real(); |
468 | tv = ktime_to_timeval(sk->sk_stamp); |
469 | } |
470 | err = 0; |
471 | if (put_user(tv.tv_sec, &ctv->tv_sec) || |
472 | put_user(tv.tv_usec, &ctv->tv_usec)) |
473 | err = -EFAULT; |
474 | return err; |
475 | } |
476 | EXPORT_SYMBOL(compat_sock_get_timestamp); |
477 | |
478 | int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
479 | { |
480 | struct compat_timespec __user *ctv = |
481 | (struct compat_timespec __user *) userstamp; |
482 | int err = -ENOENT; |
483 | struct timespec ts; |
484 | |
485 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
486 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
487 | ts = ktime_to_timespec(sk->sk_stamp); |
488 | if (ts.tv_sec == -1) |
489 | return err; |
490 | if (ts.tv_sec == 0) { |
491 | sk->sk_stamp = ktime_get_real(); |
492 | ts = ktime_to_timespec(sk->sk_stamp); |
493 | } |
494 | err = 0; |
495 | if (put_user(ts.tv_sec, &ctv->tv_sec) || |
496 | put_user(ts.tv_nsec, &ctv->tv_nsec)) |
497 | err = -EFAULT; |
498 | return err; |
499 | } |
500 | EXPORT_SYMBOL(compat_sock_get_timestampns); |
501 | |
502 | asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, |
503 | char __user *optval, int __user *optlen) |
504 | { |
505 | int err; |
506 | struct socket *sock = sockfd_lookup(fd, &err); |
507 | |
508 | if (sock) { |
509 | err = security_socket_getsockopt(sock, level, optname); |
510 | if (err) { |
511 | sockfd_put(sock); |
512 | return err; |
513 | } |
514 | |
515 | if (level == SOL_SOCKET) |
516 | err = compat_sock_getsockopt(sock, level, |
517 | optname, optval, optlen); |
518 | else if (sock->ops->compat_getsockopt) |
519 | err = sock->ops->compat_getsockopt(sock, level, |
520 | optname, optval, optlen); |
521 | else |
522 | err = sock->ops->getsockopt(sock, level, |
523 | optname, optval, optlen); |
524 | sockfd_put(sock); |
525 | } |
526 | return err; |
527 | } |
528 | |
529 | struct compat_group_req { |
530 | __u32 gr_interface; |
531 | struct __kernel_sockaddr_storage gr_group |
532 | __attribute__ ((aligned(4))); |
533 | } __packed; |
534 | |
535 | struct compat_group_source_req { |
536 | __u32 gsr_interface; |
537 | struct __kernel_sockaddr_storage gsr_group |
538 | __attribute__ ((aligned(4))); |
539 | struct __kernel_sockaddr_storage gsr_source |
540 | __attribute__ ((aligned(4))); |
541 | } __packed; |
542 | |
543 | struct compat_group_filter { |
544 | __u32 gf_interface; |
545 | struct __kernel_sockaddr_storage gf_group |
546 | __attribute__ ((aligned(4))); |
547 | __u32 gf_fmode; |
548 | __u32 gf_numsrc; |
549 | struct __kernel_sockaddr_storage gf_slist[1] |
550 | __attribute__ ((aligned(4))); |
551 | } __packed; |
552 | |
553 | #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ |
554 | sizeof(struct __kernel_sockaddr_storage)) |
555 | |
556 | |
557 | int compat_mc_setsockopt(struct sock *sock, int level, int optname, |
558 | char __user *optval, unsigned int optlen, |
559 | int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) |
560 | { |
561 | char __user *koptval = optval; |
562 | int koptlen = optlen; |
563 | |
564 | switch (optname) { |
565 | case MCAST_JOIN_GROUP: |
566 | case MCAST_LEAVE_GROUP: |
567 | { |
568 | struct compat_group_req __user *gr32 = (void *)optval; |
569 | struct group_req __user *kgr = |
570 | compat_alloc_user_space(sizeof(struct group_req)); |
571 | u32 interface; |
572 | |
573 | if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || |
574 | !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || |
575 | __get_user(interface, &gr32->gr_interface) || |
576 | __put_user(interface, &kgr->gr_interface) || |
577 | copy_in_user(&kgr->gr_group, &gr32->gr_group, |
578 | sizeof(kgr->gr_group))) |
579 | return -EFAULT; |
580 | koptval = (char __user *)kgr; |
581 | koptlen = sizeof(struct group_req); |
582 | break; |
583 | } |
584 | case MCAST_JOIN_SOURCE_GROUP: |
585 | case MCAST_LEAVE_SOURCE_GROUP: |
586 | case MCAST_BLOCK_SOURCE: |
587 | case MCAST_UNBLOCK_SOURCE: |
588 | { |
589 | struct compat_group_source_req __user *gsr32 = (void *)optval; |
590 | struct group_source_req __user *kgsr = compat_alloc_user_space( |
591 | sizeof(struct group_source_req)); |
592 | u32 interface; |
593 | |
594 | if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || |
595 | !access_ok(VERIFY_WRITE, kgsr, |
596 | sizeof(struct group_source_req)) || |
597 | __get_user(interface, &gsr32->gsr_interface) || |
598 | __put_user(interface, &kgsr->gsr_interface) || |
599 | copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, |
600 | sizeof(kgsr->gsr_group)) || |
601 | copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, |
602 | sizeof(kgsr->gsr_source))) |
603 | return -EFAULT; |
604 | koptval = (char __user *)kgsr; |
605 | koptlen = sizeof(struct group_source_req); |
606 | break; |
607 | } |
608 | case MCAST_MSFILTER: |
609 | { |
610 | struct compat_group_filter __user *gf32 = (void *)optval; |
611 | struct group_filter __user *kgf; |
612 | u32 interface, fmode, numsrc; |
613 | |
614 | if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || |
615 | __get_user(interface, &gf32->gf_interface) || |
616 | __get_user(fmode, &gf32->gf_fmode) || |
617 | __get_user(numsrc, &gf32->gf_numsrc)) |
618 | return -EFAULT; |
619 | koptlen = optlen + sizeof(struct group_filter) - |
620 | sizeof(struct compat_group_filter); |
621 | if (koptlen < GROUP_FILTER_SIZE(numsrc)) |
622 | return -EINVAL; |
623 | kgf = compat_alloc_user_space(koptlen); |
624 | if (!access_ok(VERIFY_WRITE, kgf, koptlen) || |
625 | __put_user(interface, &kgf->gf_interface) || |
626 | __put_user(fmode, &kgf->gf_fmode) || |
627 | __put_user(numsrc, &kgf->gf_numsrc) || |
628 | copy_in_user(&kgf->gf_group, &gf32->gf_group, |
629 | sizeof(kgf->gf_group)) || |
630 | (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, |
631 | numsrc * sizeof(kgf->gf_slist[0])))) |
632 | return -EFAULT; |
633 | koptval = (char __user *)kgf; |
634 | break; |
635 | } |
636 | |
637 | default: |
638 | break; |
639 | } |
640 | return setsockopt(sock, level, optname, koptval, koptlen); |
641 | } |
642 | EXPORT_SYMBOL(compat_mc_setsockopt); |
643 | |
644 | int compat_mc_getsockopt(struct sock *sock, int level, int optname, |
645 | char __user *optval, int __user *optlen, |
646 | int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) |
647 | { |
648 | struct compat_group_filter __user *gf32 = (void *)optval; |
649 | struct group_filter __user *kgf; |
650 | int __user *koptlen; |
651 | u32 interface, fmode, numsrc; |
652 | int klen, ulen, err; |
653 | |
654 | if (optname != MCAST_MSFILTER) |
655 | return getsockopt(sock, level, optname, optval, optlen); |
656 | |
657 | koptlen = compat_alloc_user_space(sizeof(*koptlen)); |
658 | if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || |
659 | __get_user(ulen, optlen)) |
660 | return -EFAULT; |
661 | |
662 | /* adjust len for pad */ |
663 | klen = ulen + sizeof(*kgf) - sizeof(*gf32); |
664 | |
665 | if (klen < GROUP_FILTER_SIZE(0)) |
666 | return -EINVAL; |
667 | |
668 | if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || |
669 | __put_user(klen, koptlen)) |
670 | return -EFAULT; |
671 | |
672 | /* have to allow space for previous compat_alloc_user_space, too */ |
673 | kgf = compat_alloc_user_space(klen+sizeof(*optlen)); |
674 | |
675 | if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || |
676 | __get_user(interface, &gf32->gf_interface) || |
677 | __get_user(fmode, &gf32->gf_fmode) || |
678 | __get_user(numsrc, &gf32->gf_numsrc) || |
679 | __put_user(interface, &kgf->gf_interface) || |
680 | __put_user(fmode, &kgf->gf_fmode) || |
681 | __put_user(numsrc, &kgf->gf_numsrc) || |
682 | copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) |
683 | return -EFAULT; |
684 | |
685 | err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); |
686 | if (err) |
687 | return err; |
688 | |
689 | if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || |
690 | __get_user(klen, koptlen)) |
691 | return -EFAULT; |
692 | |
693 | ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); |
694 | |
695 | if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || |
696 | __put_user(ulen, optlen)) |
697 | return -EFAULT; |
698 | |
699 | if (!access_ok(VERIFY_READ, kgf, klen) || |
700 | !access_ok(VERIFY_WRITE, gf32, ulen) || |
701 | __get_user(interface, &kgf->gf_interface) || |
702 | __get_user(fmode, &kgf->gf_fmode) || |
703 | __get_user(numsrc, &kgf->gf_numsrc) || |
704 | __put_user(interface, &gf32->gf_interface) || |
705 | __put_user(fmode, &gf32->gf_fmode) || |
706 | __put_user(numsrc, &gf32->gf_numsrc)) |
707 | return -EFAULT; |
708 | if (numsrc) { |
709 | int copylen; |
710 | |
711 | klen -= GROUP_FILTER_SIZE(0); |
712 | copylen = numsrc * sizeof(gf32->gf_slist[0]); |
713 | if (copylen > klen) |
714 | copylen = klen; |
715 | if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) |
716 | return -EFAULT; |
717 | } |
718 | return err; |
719 | } |
720 | EXPORT_SYMBOL(compat_mc_getsockopt); |
721 | |
722 | |
723 | /* Argument list sizes for compat_sys_socketcall */ |
724 | #define AL(x) ((x) * sizeof(u32)) |
725 | static unsigned char nas[20] = { |
726 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
727 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), |
728 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), |
729 | AL(4), AL(5) |
730 | }; |
731 | #undef AL |
732 | |
733 | asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) |
734 | { |
735 | return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); |
736 | } |
737 | |
738 | asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) |
739 | { |
740 | return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); |
741 | } |
742 | |
743 | asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags) |
744 | { |
745 | return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); |
746 | } |
747 | |
748 | asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len, |
749 | unsigned flags, struct sockaddr __user *addr, |
750 | int __user *addrlen) |
751 | { |
752 | return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); |
753 | } |
754 | |
755 | asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, |
756 | unsigned vlen, unsigned int flags, |
757 | struct compat_timespec __user *timeout) |
758 | { |
759 | int datagrams; |
760 | struct timespec ktspec; |
761 | |
762 | if (timeout == NULL) |
763 | return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, |
764 | flags | MSG_CMSG_COMPAT, NULL); |
765 | |
766 | if (get_compat_timespec(&ktspec, timeout)) |
767 | return -EFAULT; |
768 | |
769 | datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, |
770 | flags | MSG_CMSG_COMPAT, &ktspec); |
771 | if (datagrams > 0 && put_compat_timespec(&ktspec, timeout)) |
772 | datagrams = -EFAULT; |
773 | |
774 | return datagrams; |
775 | } |
776 | |
777 | asmlinkage long compat_sys_socketcall(int call, u32 __user *args) |
778 | { |
779 | int ret; |
780 | u32 a[6]; |
781 | u32 a0, a1; |
782 | |
783 | if (call < SYS_SOCKET || call > SYS_RECVMMSG) |
784 | return -EINVAL; |
785 | if (copy_from_user(a, args, nas[call])) |
786 | return -EFAULT; |
787 | a0 = a[0]; |
788 | a1 = a[1]; |
789 | |
790 | switch (call) { |
791 | case SYS_SOCKET: |
792 | ret = sys_socket(a0, a1, a[2]); |
793 | break; |
794 | case SYS_BIND: |
795 | ret = sys_bind(a0, compat_ptr(a1), a[2]); |
796 | break; |
797 | case SYS_CONNECT: |
798 | ret = sys_connect(a0, compat_ptr(a1), a[2]); |
799 | break; |
800 | case SYS_LISTEN: |
801 | ret = sys_listen(a0, a1); |
802 | break; |
803 | case SYS_ACCEPT: |
804 | ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); |
805 | break; |
806 | case SYS_GETSOCKNAME: |
807 | ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); |
808 | break; |
809 | case SYS_GETPEERNAME: |
810 | ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); |
811 | break; |
812 | case SYS_SOCKETPAIR: |
813 | ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); |
814 | break; |
815 | case SYS_SEND: |
816 | ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); |
817 | break; |
818 | case SYS_SENDTO: |
819 | ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); |
820 | break; |
821 | case SYS_RECV: |
822 | ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); |
823 | break; |
824 | case SYS_RECVFROM: |
825 | ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], |
826 | compat_ptr(a[4]), compat_ptr(a[5])); |
827 | break; |
828 | case SYS_SHUTDOWN: |
829 | ret = sys_shutdown(a0, a1); |
830 | break; |
831 | case SYS_SETSOCKOPT: |
832 | ret = compat_sys_setsockopt(a0, a1, a[2], |
833 | compat_ptr(a[3]), a[4]); |
834 | break; |
835 | case SYS_GETSOCKOPT: |
836 | ret = compat_sys_getsockopt(a0, a1, a[2], |
837 | compat_ptr(a[3]), compat_ptr(a[4])); |
838 | break; |
839 | case SYS_SENDMSG: |
840 | ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); |
841 | break; |
842 | case SYS_RECVMSG: |
843 | ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); |
844 | break; |
845 | case SYS_RECVMMSG: |
846 | ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], |
847 | compat_ptr(a[4])); |
848 | break; |
849 | case SYS_ACCEPT4: |
850 | ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); |
851 | break; |
852 | default: |
853 | ret = -EINVAL; |
854 | break; |
855 | } |
856 | return ret; |
857 | } |
858 |
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