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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 | #include <linux/export.h> |
26 | |
27 | #include <net/scm.h> |
28 | #include <net/sock.h> |
29 | #include <net/ip.h> |
30 | #include <net/ipv6.h> |
31 | #include <asm/uaccess.h> |
32 | #include <net/compat.h> |
33 | |
34 | static inline int iov_from_user_compat_to_kern(struct iovec *kiov, |
35 | struct compat_iovec __user *uiov32, |
36 | int niov) |
37 | { |
38 | int tot_len = 0; |
39 | |
40 | while (niov > 0) { |
41 | compat_uptr_t buf; |
42 | compat_size_t len; |
43 | |
44 | if (get_user(len, &uiov32->iov_len) || |
45 | get_user(buf, &uiov32->iov_base)) |
46 | return -EFAULT; |
47 | |
48 | if (len > INT_MAX - tot_len) |
49 | len = INT_MAX - tot_len; |
50 | |
51 | tot_len += len; |
52 | kiov->iov_base = compat_ptr(buf); |
53 | kiov->iov_len = (__kernel_size_t) len; |
54 | uiov32++; |
55 | kiov++; |
56 | niov--; |
57 | } |
58 | return tot_len; |
59 | } |
60 | |
61 | int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) |
62 | { |
63 | compat_uptr_t tmp1, tmp2, tmp3; |
64 | |
65 | if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || |
66 | __get_user(tmp1, &umsg->msg_name) || |
67 | __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || |
68 | __get_user(tmp2, &umsg->msg_iov) || |
69 | __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || |
70 | __get_user(tmp3, &umsg->msg_control) || |
71 | __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || |
72 | __get_user(kmsg->msg_flags, &umsg->msg_flags)) |
73 | return -EFAULT; |
74 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
75 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); |
76 | kmsg->msg_name = compat_ptr(tmp1); |
77 | kmsg->msg_iov = compat_ptr(tmp2); |
78 | kmsg->msg_control = compat_ptr(tmp3); |
79 | return 0; |
80 | } |
81 | |
82 | /* I've named the args so it is easy to tell whose space the pointers are in. */ |
83 | int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, |
84 | struct sockaddr_storage *kern_address, int mode) |
85 | { |
86 | int tot_len; |
87 | |
88 | if (kern_msg->msg_namelen) { |
89 | if (mode == VERIFY_READ) { |
90 | int err = move_addr_to_kernel(kern_msg->msg_name, |
91 | kern_msg->msg_namelen, |
92 | kern_address); |
93 | if (err < 0) |
94 | return err; |
95 | } |
96 | if (kern_msg->msg_name) |
97 | kern_msg->msg_name = kern_address; |
98 | } else |
99 | kern_msg->msg_name = NULL; |
100 | |
101 | tot_len = iov_from_user_compat_to_kern(kern_iov, |
102 | (struct compat_iovec __user *)kern_msg->msg_iov, |
103 | kern_msg->msg_iovlen); |
104 | if (tot_len >= 0) |
105 | kern_msg->msg_iov = kern_iov; |
106 | |
107 | return tot_len; |
108 | } |
109 | |
110 | /* Bleech... */ |
111 | #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) |
112 | |
113 | #define CMSG_COMPAT_DATA(cmsg) \ |
114 | ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) |
115 | #define CMSG_COMPAT_SPACE(len) \ |
116 | (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) |
117 | #define CMSG_COMPAT_LEN(len) \ |
118 | (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) |
119 | |
120 | #define CMSG_COMPAT_FIRSTHDR(msg) \ |
121 | (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ |
122 | (struct compat_cmsghdr __user *)((msg)->msg_control) : \ |
123 | (struct compat_cmsghdr __user *)NULL) |
124 | |
125 | #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ |
126 | ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ |
127 | (ucmlen) <= (unsigned long) \ |
128 | ((mhdr)->msg_controllen - \ |
129 | ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) |
130 | |
131 | static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, |
132 | struct compat_cmsghdr __user *cmsg, int cmsg_len) |
133 | { |
134 | char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); |
135 | if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > |
136 | msg->msg_controllen) |
137 | return NULL; |
138 | return (struct compat_cmsghdr __user *)ptr; |
139 | } |
140 | |
141 | /* There is a lot of hair here because the alignment rules (and |
142 | * thus placement) of cmsg headers and length are different for |
143 | * 32-bit apps. -DaveM |
144 | */ |
145 | int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, |
146 | unsigned char *stackbuf, int stackbuf_size) |
147 | { |
148 | struct compat_cmsghdr __user *ucmsg; |
149 | struct cmsghdr *kcmsg, *kcmsg_base; |
150 | compat_size_t ucmlen; |
151 | __kernel_size_t kcmlen, tmp; |
152 | int err = -EFAULT; |
153 | |
154 | kcmlen = 0; |
155 | kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; |
156 | ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); |
157 | while (ucmsg != NULL) { |
158 | if (get_user(ucmlen, &ucmsg->cmsg_len)) |
159 | return -EFAULT; |
160 | |
161 | /* Catch bogons. */ |
162 | if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) |
163 | return -EINVAL; |
164 | |
165 | tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + |
166 | CMSG_ALIGN(sizeof(struct cmsghdr))); |
167 | tmp = CMSG_ALIGN(tmp); |
168 | kcmlen += tmp; |
169 | ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); |
170 | } |
171 | if (kcmlen == 0) |
172 | return -EINVAL; |
173 | |
174 | /* The kcmlen holds the 64-bit version of the control length. |
175 | * It may not be modified as we do not stick it into the kmsg |
176 | * until we have successfully copied over all of the data |
177 | * from the user. |
178 | */ |
179 | if (kcmlen > stackbuf_size) |
180 | kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); |
181 | if (kcmsg == NULL) |
182 | return -ENOBUFS; |
183 | |
184 | /* Now copy them over neatly. */ |
185 | memset(kcmsg, 0, kcmlen); |
186 | ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); |
187 | while (ucmsg != NULL) { |
188 | if (__get_user(ucmlen, &ucmsg->cmsg_len)) |
189 | goto Efault; |
190 | if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) |
191 | goto Einval; |
192 | tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + |
193 | CMSG_ALIGN(sizeof(struct cmsghdr))); |
194 | if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) |
195 | goto Einval; |
196 | kcmsg->cmsg_len = tmp; |
197 | tmp = CMSG_ALIGN(tmp); |
198 | if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || |
199 | __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || |
200 | copy_from_user(CMSG_DATA(kcmsg), |
201 | CMSG_COMPAT_DATA(ucmsg), |
202 | (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) |
203 | goto Efault; |
204 | |
205 | /* Advance. */ |
206 | kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); |
207 | ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); |
208 | } |
209 | |
210 | /* Ok, looks like we made it. Hook it up and return success. */ |
211 | kmsg->msg_control = kcmsg_base; |
212 | kmsg->msg_controllen = kcmlen; |
213 | return 0; |
214 | |
215 | Einval: |
216 | err = -EINVAL; |
217 | Efault: |
218 | if (kcmsg_base != (struct cmsghdr *)stackbuf) |
219 | sock_kfree_s(sk, kcmsg_base, kcmlen); |
220 | return err; |
221 | } |
222 | |
223 | int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) |
224 | { |
225 | struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; |
226 | struct compat_cmsghdr cmhdr; |
227 | struct compat_timeval ctv; |
228 | struct compat_timespec cts[3]; |
229 | int cmlen; |
230 | |
231 | if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { |
232 | kmsg->msg_flags |= MSG_CTRUNC; |
233 | return 0; /* XXX: return error? check spec. */ |
234 | } |
235 | |
236 | if (!COMPAT_USE_64BIT_TIME) { |
237 | if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { |
238 | struct timeval *tv = (struct timeval *)data; |
239 | ctv.tv_sec = tv->tv_sec; |
240 | ctv.tv_usec = tv->tv_usec; |
241 | data = &ctv; |
242 | len = sizeof(ctv); |
243 | } |
244 | if (level == SOL_SOCKET && |
245 | (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { |
246 | int count = type == SCM_TIMESTAMPNS ? 1 : 3; |
247 | int i; |
248 | struct timespec *ts = (struct timespec *)data; |
249 | for (i = 0; i < count; i++) { |
250 | cts[i].tv_sec = ts[i].tv_sec; |
251 | cts[i].tv_nsec = ts[i].tv_nsec; |
252 | } |
253 | data = &cts; |
254 | len = sizeof(cts[0]) * count; |
255 | } |
256 | } |
257 | |
258 | cmlen = CMSG_COMPAT_LEN(len); |
259 | if (kmsg->msg_controllen < cmlen) { |
260 | kmsg->msg_flags |= MSG_CTRUNC; |
261 | cmlen = kmsg->msg_controllen; |
262 | } |
263 | cmhdr.cmsg_level = level; |
264 | cmhdr.cmsg_type = type; |
265 | cmhdr.cmsg_len = cmlen; |
266 | |
267 | if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) |
268 | return -EFAULT; |
269 | if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) |
270 | return -EFAULT; |
271 | cmlen = CMSG_COMPAT_SPACE(len); |
272 | if (kmsg->msg_controllen < cmlen) |
273 | cmlen = kmsg->msg_controllen; |
274 | kmsg->msg_control += cmlen; |
275 | kmsg->msg_controllen -= cmlen; |
276 | return 0; |
277 | } |
278 | |
279 | void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) |
280 | { |
281 | struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; |
282 | int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); |
283 | int fdnum = scm->fp->count; |
284 | struct file **fp = scm->fp->fp; |
285 | int __user *cmfptr; |
286 | int err = 0, i; |
287 | |
288 | if (fdnum < fdmax) |
289 | fdmax = fdnum; |
290 | |
291 | for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { |
292 | int new_fd; |
293 | err = security_file_receive(fp[i]); |
294 | if (err) |
295 | break; |
296 | err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags |
297 | ? O_CLOEXEC : 0); |
298 | if (err < 0) |
299 | break; |
300 | new_fd = err; |
301 | err = put_user(new_fd, cmfptr); |
302 | if (err) { |
303 | put_unused_fd(new_fd); |
304 | break; |
305 | } |
306 | /* Bump the usage count and install the file. */ |
307 | fd_install(new_fd, get_file(fp[i])); |
308 | } |
309 | |
310 | if (i > 0) { |
311 | int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); |
312 | err = put_user(SOL_SOCKET, &cm->cmsg_level); |
313 | if (!err) |
314 | err = put_user(SCM_RIGHTS, &cm->cmsg_type); |
315 | if (!err) |
316 | err = put_user(cmlen, &cm->cmsg_len); |
317 | if (!err) { |
318 | cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); |
319 | kmsg->msg_control += cmlen; |
320 | kmsg->msg_controllen -= cmlen; |
321 | } |
322 | } |
323 | if (i < fdnum) |
324 | kmsg->msg_flags |= MSG_CTRUNC; |
325 | |
326 | /* |
327 | * All of the files that fit in the message have had their |
328 | * usage counts incremented, so we just free the list. |
329 | */ |
330 | __scm_destroy(scm); |
331 | } |
332 | |
333 | static int do_set_attach_filter(struct socket *sock, int level, int optname, |
334 | char __user *optval, unsigned int optlen) |
335 | { |
336 | struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; |
337 | struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); |
338 | compat_uptr_t ptr; |
339 | u16 len; |
340 | |
341 | if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || |
342 | !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || |
343 | __get_user(len, &fprog32->len) || |
344 | __get_user(ptr, &fprog32->filter) || |
345 | __put_user(len, &kfprog->len) || |
346 | __put_user(compat_ptr(ptr), &kfprog->filter)) |
347 | return -EFAULT; |
348 | |
349 | return sock_setsockopt(sock, level, optname, (char __user *)kfprog, |
350 | sizeof(struct sock_fprog)); |
351 | } |
352 | |
353 | static int do_set_sock_timeout(struct socket *sock, int level, |
354 | int optname, char __user *optval, unsigned int optlen) |
355 | { |
356 | struct compat_timeval __user *up = (struct compat_timeval __user *)optval; |
357 | struct timeval ktime; |
358 | mm_segment_t old_fs; |
359 | int err; |
360 | |
361 | if (optlen < sizeof(*up)) |
362 | return -EINVAL; |
363 | if (!access_ok(VERIFY_READ, up, sizeof(*up)) || |
364 | __get_user(ktime.tv_sec, &up->tv_sec) || |
365 | __get_user(ktime.tv_usec, &up->tv_usec)) |
366 | return -EFAULT; |
367 | old_fs = get_fs(); |
368 | set_fs(KERNEL_DS); |
369 | err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); |
370 | set_fs(old_fs); |
371 | |
372 | return err; |
373 | } |
374 | |
375 | static int compat_sock_setsockopt(struct socket *sock, int level, int optname, |
376 | char __user *optval, unsigned int optlen) |
377 | { |
378 | if (optname == SO_ATTACH_FILTER) |
379 | return do_set_attach_filter(sock, level, optname, |
380 | optval, optlen); |
381 | if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) |
382 | return do_set_sock_timeout(sock, level, optname, optval, optlen); |
383 | |
384 | return sock_setsockopt(sock, level, optname, optval, optlen); |
385 | } |
386 | |
387 | asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, |
388 | char __user *optval, unsigned int optlen) |
389 | { |
390 | int err; |
391 | struct socket *sock = sockfd_lookup(fd, &err); |
392 | |
393 | if (sock) { |
394 | err = security_socket_setsockopt(sock, level, optname); |
395 | if (err) { |
396 | sockfd_put(sock); |
397 | return err; |
398 | } |
399 | |
400 | if (level == SOL_SOCKET) |
401 | err = compat_sock_setsockopt(sock, level, |
402 | optname, optval, optlen); |
403 | else if (sock->ops->compat_setsockopt) |
404 | err = sock->ops->compat_setsockopt(sock, level, |
405 | optname, optval, optlen); |
406 | else |
407 | err = sock->ops->setsockopt(sock, level, |
408 | optname, optval, optlen); |
409 | sockfd_put(sock); |
410 | } |
411 | return err; |
412 | } |
413 | |
414 | static int do_get_sock_timeout(struct socket *sock, int level, int optname, |
415 | char __user *optval, int __user *optlen) |
416 | { |
417 | struct compat_timeval __user *up; |
418 | struct timeval ktime; |
419 | mm_segment_t old_fs; |
420 | int len, err; |
421 | |
422 | up = (struct compat_timeval __user *) optval; |
423 | if (get_user(len, optlen)) |
424 | return -EFAULT; |
425 | if (len < sizeof(*up)) |
426 | return -EINVAL; |
427 | len = sizeof(ktime); |
428 | old_fs = get_fs(); |
429 | set_fs(KERNEL_DS); |
430 | err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); |
431 | set_fs(old_fs); |
432 | |
433 | if (!err) { |
434 | if (put_user(sizeof(*up), optlen) || |
435 | !access_ok(VERIFY_WRITE, up, sizeof(*up)) || |
436 | __put_user(ktime.tv_sec, &up->tv_sec) || |
437 | __put_user(ktime.tv_usec, &up->tv_usec)) |
438 | err = -EFAULT; |
439 | } |
440 | return err; |
441 | } |
442 | |
443 | static int compat_sock_getsockopt(struct socket *sock, int level, int optname, |
444 | char __user *optval, int __user *optlen) |
445 | { |
446 | if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) |
447 | return do_get_sock_timeout(sock, level, optname, optval, optlen); |
448 | return sock_getsockopt(sock, level, optname, optval, optlen); |
449 | } |
450 | |
451 | int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
452 | { |
453 | struct compat_timeval __user *ctv; |
454 | int err; |
455 | struct timeval tv; |
456 | |
457 | if (COMPAT_USE_64BIT_TIME) |
458 | return sock_get_timestamp(sk, userstamp); |
459 | |
460 | ctv = (struct compat_timeval __user *) userstamp; |
461 | err = -ENOENT; |
462 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
463 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
464 | tv = ktime_to_timeval(sk->sk_stamp); |
465 | if (tv.tv_sec == -1) |
466 | return err; |
467 | if (tv.tv_sec == 0) { |
468 | sk->sk_stamp = ktime_get_real(); |
469 | tv = ktime_to_timeval(sk->sk_stamp); |
470 | } |
471 | err = 0; |
472 | if (put_user(tv.tv_sec, &ctv->tv_sec) || |
473 | put_user(tv.tv_usec, &ctv->tv_usec)) |
474 | err = -EFAULT; |
475 | return err; |
476 | } |
477 | EXPORT_SYMBOL(compat_sock_get_timestamp); |
478 | |
479 | int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
480 | { |
481 | struct compat_timespec __user *ctv; |
482 | int err; |
483 | struct timespec ts; |
484 | |
485 | if (COMPAT_USE_64BIT_TIME) |
486 | return sock_get_timestampns (sk, userstamp); |
487 | |
488 | ctv = (struct compat_timespec __user *) userstamp; |
489 | err = -ENOENT; |
490 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
491 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
492 | ts = ktime_to_timespec(sk->sk_stamp); |
493 | if (ts.tv_sec == -1) |
494 | return err; |
495 | if (ts.tv_sec == 0) { |
496 | sk->sk_stamp = ktime_get_real(); |
497 | ts = ktime_to_timespec(sk->sk_stamp); |
498 | } |
499 | err = 0; |
500 | if (put_user(ts.tv_sec, &ctv->tv_sec) || |
501 | put_user(ts.tv_nsec, &ctv->tv_nsec)) |
502 | err = -EFAULT; |
503 | return err; |
504 | } |
505 | EXPORT_SYMBOL(compat_sock_get_timestampns); |
506 | |
507 | asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, |
508 | char __user *optval, int __user *optlen) |
509 | { |
510 | int err; |
511 | struct socket *sock = sockfd_lookup(fd, &err); |
512 | |
513 | if (sock) { |
514 | err = security_socket_getsockopt(sock, level, optname); |
515 | if (err) { |
516 | sockfd_put(sock); |
517 | return err; |
518 | } |
519 | |
520 | if (level == SOL_SOCKET) |
521 | err = compat_sock_getsockopt(sock, level, |
522 | optname, optval, optlen); |
523 | else if (sock->ops->compat_getsockopt) |
524 | err = sock->ops->compat_getsockopt(sock, level, |
525 | optname, optval, optlen); |
526 | else |
527 | err = sock->ops->getsockopt(sock, level, |
528 | optname, optval, optlen); |
529 | sockfd_put(sock); |
530 | } |
531 | return err; |
532 | } |
533 | |
534 | struct compat_group_req { |
535 | __u32 gr_interface; |
536 | struct __kernel_sockaddr_storage gr_group |
537 | __attribute__ ((aligned(4))); |
538 | } __packed; |
539 | |
540 | struct compat_group_source_req { |
541 | __u32 gsr_interface; |
542 | struct __kernel_sockaddr_storage gsr_group |
543 | __attribute__ ((aligned(4))); |
544 | struct __kernel_sockaddr_storage gsr_source |
545 | __attribute__ ((aligned(4))); |
546 | } __packed; |
547 | |
548 | struct compat_group_filter { |
549 | __u32 gf_interface; |
550 | struct __kernel_sockaddr_storage gf_group |
551 | __attribute__ ((aligned(4))); |
552 | __u32 gf_fmode; |
553 | __u32 gf_numsrc; |
554 | struct __kernel_sockaddr_storage gf_slist[1] |
555 | __attribute__ ((aligned(4))); |
556 | } __packed; |
557 | |
558 | #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ |
559 | sizeof(struct __kernel_sockaddr_storage)) |
560 | |
561 | |
562 | int compat_mc_setsockopt(struct sock *sock, int level, int optname, |
563 | char __user *optval, unsigned int optlen, |
564 | int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) |
565 | { |
566 | char __user *koptval = optval; |
567 | int koptlen = optlen; |
568 | |
569 | switch (optname) { |
570 | case MCAST_JOIN_GROUP: |
571 | case MCAST_LEAVE_GROUP: |
572 | { |
573 | struct compat_group_req __user *gr32 = (void *)optval; |
574 | struct group_req __user *kgr = |
575 | compat_alloc_user_space(sizeof(struct group_req)); |
576 | u32 interface; |
577 | |
578 | if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || |
579 | !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || |
580 | __get_user(interface, &gr32->gr_interface) || |
581 | __put_user(interface, &kgr->gr_interface) || |
582 | copy_in_user(&kgr->gr_group, &gr32->gr_group, |
583 | sizeof(kgr->gr_group))) |
584 | return -EFAULT; |
585 | koptval = (char __user *)kgr; |
586 | koptlen = sizeof(struct group_req); |
587 | break; |
588 | } |
589 | case MCAST_JOIN_SOURCE_GROUP: |
590 | case MCAST_LEAVE_SOURCE_GROUP: |
591 | case MCAST_BLOCK_SOURCE: |
592 | case MCAST_UNBLOCK_SOURCE: |
593 | { |
594 | struct compat_group_source_req __user *gsr32 = (void *)optval; |
595 | struct group_source_req __user *kgsr = compat_alloc_user_space( |
596 | sizeof(struct group_source_req)); |
597 | u32 interface; |
598 | |
599 | if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || |
600 | !access_ok(VERIFY_WRITE, kgsr, |
601 | sizeof(struct group_source_req)) || |
602 | __get_user(interface, &gsr32->gsr_interface) || |
603 | __put_user(interface, &kgsr->gsr_interface) || |
604 | copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, |
605 | sizeof(kgsr->gsr_group)) || |
606 | copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, |
607 | sizeof(kgsr->gsr_source))) |
608 | return -EFAULT; |
609 | koptval = (char __user *)kgsr; |
610 | koptlen = sizeof(struct group_source_req); |
611 | break; |
612 | } |
613 | case MCAST_MSFILTER: |
614 | { |
615 | struct compat_group_filter __user *gf32 = (void *)optval; |
616 | struct group_filter __user *kgf; |
617 | u32 interface, fmode, numsrc; |
618 | |
619 | if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || |
620 | __get_user(interface, &gf32->gf_interface) || |
621 | __get_user(fmode, &gf32->gf_fmode) || |
622 | __get_user(numsrc, &gf32->gf_numsrc)) |
623 | return -EFAULT; |
624 | koptlen = optlen + sizeof(struct group_filter) - |
625 | sizeof(struct compat_group_filter); |
626 | if (koptlen < GROUP_FILTER_SIZE(numsrc)) |
627 | return -EINVAL; |
628 | kgf = compat_alloc_user_space(koptlen); |
629 | if (!access_ok(VERIFY_WRITE, kgf, koptlen) || |
630 | __put_user(interface, &kgf->gf_interface) || |
631 | __put_user(fmode, &kgf->gf_fmode) || |
632 | __put_user(numsrc, &kgf->gf_numsrc) || |
633 | copy_in_user(&kgf->gf_group, &gf32->gf_group, |
634 | sizeof(kgf->gf_group)) || |
635 | (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, |
636 | numsrc * sizeof(kgf->gf_slist[0])))) |
637 | return -EFAULT; |
638 | koptval = (char __user *)kgf; |
639 | break; |
640 | } |
641 | |
642 | default: |
643 | break; |
644 | } |
645 | return setsockopt(sock, level, optname, koptval, koptlen); |
646 | } |
647 | EXPORT_SYMBOL(compat_mc_setsockopt); |
648 | |
649 | int compat_mc_getsockopt(struct sock *sock, int level, int optname, |
650 | char __user *optval, int __user *optlen, |
651 | int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) |
652 | { |
653 | struct compat_group_filter __user *gf32 = (void *)optval; |
654 | struct group_filter __user *kgf; |
655 | int __user *koptlen; |
656 | u32 interface, fmode, numsrc; |
657 | int klen, ulen, err; |
658 | |
659 | if (optname != MCAST_MSFILTER) |
660 | return getsockopt(sock, level, optname, optval, optlen); |
661 | |
662 | koptlen = compat_alloc_user_space(sizeof(*koptlen)); |
663 | if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || |
664 | __get_user(ulen, optlen)) |
665 | return -EFAULT; |
666 | |
667 | /* adjust len for pad */ |
668 | klen = ulen + sizeof(*kgf) - sizeof(*gf32); |
669 | |
670 | if (klen < GROUP_FILTER_SIZE(0)) |
671 | return -EINVAL; |
672 | |
673 | if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || |
674 | __put_user(klen, koptlen)) |
675 | return -EFAULT; |
676 | |
677 | /* have to allow space for previous compat_alloc_user_space, too */ |
678 | kgf = compat_alloc_user_space(klen+sizeof(*optlen)); |
679 | |
680 | if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || |
681 | __get_user(interface, &gf32->gf_interface) || |
682 | __get_user(fmode, &gf32->gf_fmode) || |
683 | __get_user(numsrc, &gf32->gf_numsrc) || |
684 | __put_user(interface, &kgf->gf_interface) || |
685 | __put_user(fmode, &kgf->gf_fmode) || |
686 | __put_user(numsrc, &kgf->gf_numsrc) || |
687 | copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) |
688 | return -EFAULT; |
689 | |
690 | err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); |
691 | if (err) |
692 | return err; |
693 | |
694 | if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || |
695 | __get_user(klen, koptlen)) |
696 | return -EFAULT; |
697 | |
698 | ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); |
699 | |
700 | if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || |
701 | __put_user(ulen, optlen)) |
702 | return -EFAULT; |
703 | |
704 | if (!access_ok(VERIFY_READ, kgf, klen) || |
705 | !access_ok(VERIFY_WRITE, gf32, ulen) || |
706 | __get_user(interface, &kgf->gf_interface) || |
707 | __get_user(fmode, &kgf->gf_fmode) || |
708 | __get_user(numsrc, &kgf->gf_numsrc) || |
709 | __put_user(interface, &gf32->gf_interface) || |
710 | __put_user(fmode, &gf32->gf_fmode) || |
711 | __put_user(numsrc, &gf32->gf_numsrc)) |
712 | return -EFAULT; |
713 | if (numsrc) { |
714 | int copylen; |
715 | |
716 | klen -= GROUP_FILTER_SIZE(0); |
717 | copylen = numsrc * sizeof(gf32->gf_slist[0]); |
718 | if (copylen > klen) |
719 | copylen = klen; |
720 | if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) |
721 | return -EFAULT; |
722 | } |
723 | return err; |
724 | } |
725 | EXPORT_SYMBOL(compat_mc_getsockopt); |
726 | |
727 | |
728 | /* Argument list sizes for compat_sys_socketcall */ |
729 | #define AL(x) ((x) * sizeof(u32)) |
730 | static unsigned char nas[21] = { |
731 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
732 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), |
733 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), |
734 | AL(4), AL(5), AL(4) |
735 | }; |
736 | #undef AL |
737 | |
738 | asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) |
739 | { |
740 | if (flags & MSG_CMSG_COMPAT) |
741 | return -EINVAL; |
742 | return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); |
743 | } |
744 | |
745 | asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, |
746 | unsigned int vlen, unsigned int flags) |
747 | { |
748 | if (flags & MSG_CMSG_COMPAT) |
749 | return -EINVAL; |
750 | return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, |
751 | flags | MSG_CMSG_COMPAT); |
752 | } |
753 | |
754 | asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) |
755 | { |
756 | if (flags & MSG_CMSG_COMPAT) |
757 | return -EINVAL; |
758 | return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); |
759 | } |
760 | |
761 | asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags) |
762 | { |
763 | return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); |
764 | } |
765 | |
766 | asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len, |
767 | unsigned int flags, struct sockaddr __user *addr, |
768 | int __user *addrlen) |
769 | { |
770 | return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); |
771 | } |
772 | |
773 | asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, |
774 | unsigned int vlen, unsigned int flags, |
775 | struct compat_timespec __user *timeout) |
776 | { |
777 | int datagrams; |
778 | struct timespec ktspec; |
779 | |
780 | if (flags & MSG_CMSG_COMPAT) |
781 | return -EINVAL; |
782 | |
783 | if (COMPAT_USE_64BIT_TIME) |
784 | return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, |
785 | flags | MSG_CMSG_COMPAT, |
786 | (struct timespec *) timeout); |
787 | |
788 | if (timeout == NULL) |
789 | return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, |
790 | flags | MSG_CMSG_COMPAT, NULL); |
791 | |
792 | if (get_compat_timespec(&ktspec, timeout)) |
793 | return -EFAULT; |
794 | |
795 | datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, |
796 | flags | MSG_CMSG_COMPAT, &ktspec); |
797 | if (datagrams > 0 && put_compat_timespec(&ktspec, timeout)) |
798 | datagrams = -EFAULT; |
799 | |
800 | return datagrams; |
801 | } |
802 | |
803 | asmlinkage long compat_sys_socketcall(int call, u32 __user *args) |
804 | { |
805 | int ret; |
806 | u32 a[6]; |
807 | u32 a0, a1; |
808 | |
809 | if (call < SYS_SOCKET || call > SYS_SENDMMSG) |
810 | return -EINVAL; |
811 | if (copy_from_user(a, args, nas[call])) |
812 | return -EFAULT; |
813 | a0 = a[0]; |
814 | a1 = a[1]; |
815 | |
816 | switch (call) { |
817 | case SYS_SOCKET: |
818 | ret = sys_socket(a0, a1, a[2]); |
819 | break; |
820 | case SYS_BIND: |
821 | ret = sys_bind(a0, compat_ptr(a1), a[2]); |
822 | break; |
823 | case SYS_CONNECT: |
824 | ret = sys_connect(a0, compat_ptr(a1), a[2]); |
825 | break; |
826 | case SYS_LISTEN: |
827 | ret = sys_listen(a0, a1); |
828 | break; |
829 | case SYS_ACCEPT: |
830 | ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); |
831 | break; |
832 | case SYS_GETSOCKNAME: |
833 | ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); |
834 | break; |
835 | case SYS_GETPEERNAME: |
836 | ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); |
837 | break; |
838 | case SYS_SOCKETPAIR: |
839 | ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); |
840 | break; |
841 | case SYS_SEND: |
842 | ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); |
843 | break; |
844 | case SYS_SENDTO: |
845 | ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); |
846 | break; |
847 | case SYS_RECV: |
848 | ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); |
849 | break; |
850 | case SYS_RECVFROM: |
851 | ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], |
852 | compat_ptr(a[4]), compat_ptr(a[5])); |
853 | break; |
854 | case SYS_SHUTDOWN: |
855 | ret = sys_shutdown(a0, a1); |
856 | break; |
857 | case SYS_SETSOCKOPT: |
858 | ret = compat_sys_setsockopt(a0, a1, a[2], |
859 | compat_ptr(a[3]), a[4]); |
860 | break; |
861 | case SYS_GETSOCKOPT: |
862 | ret = compat_sys_getsockopt(a0, a1, a[2], |
863 | compat_ptr(a[3]), compat_ptr(a[4])); |
864 | break; |
865 | case SYS_SENDMSG: |
866 | ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); |
867 | break; |
868 | case SYS_SENDMMSG: |
869 | ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); |
870 | break; |
871 | case SYS_RECVMSG: |
872 | ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); |
873 | break; |
874 | case SYS_RECVMMSG: |
875 | ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], |
876 | compat_ptr(a[4])); |
877 | break; |
878 | case SYS_ACCEPT4: |
879 | ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); |
880 | break; |
881 | default: |
882 | ret = -EINVAL; |
883 | break; |
884 | } |
885 | return ret; |
886 | } |
887 |
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