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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/audit.h> | |
26 | #include <linux/export.h> | |
27 | ||
28 | #include <net/scm.h> | |
29 | #include <net/sock.h> | |
30 | #include <net/ip.h> | |
31 | #include <net/ipv6.h> | |
32 | #include <linux/uaccess.h> | |
33 | #include <net/compat.h> | |
34 | ||
35 | int get_compat_msghdr(struct msghdr *kmsg, | |
36 | struct compat_msghdr __user *umsg, | |
37 | struct sockaddr __user **save_addr, | |
38 | struct iovec **iov) | |
39 | { | |
40 | struct compat_msghdr msg; | |
41 | ssize_t err; | |
42 | ||
43 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) | |
44 | return -EFAULT; | |
45 | ||
46 | kmsg->msg_flags = msg.msg_flags; | |
47 | kmsg->msg_namelen = msg.msg_namelen; | |
48 | ||
49 | if (!msg.msg_name) | |
50 | kmsg->msg_namelen = 0; | |
51 | ||
52 | if (kmsg->msg_namelen < 0) | |
53 | return -EINVAL; | |
54 | ||
55 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) | |
56 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); | |
57 | ||
58 | kmsg->msg_control = compat_ptr(msg.msg_control); | |
59 | kmsg->msg_controllen = msg.msg_controllen; | |
60 | ||
61 | if (save_addr) | |
62 | *save_addr = compat_ptr(msg.msg_name); | |
63 | ||
64 | if (msg.msg_name && kmsg->msg_namelen) { | |
65 | if (!save_addr) { | |
66 | err = move_addr_to_kernel(compat_ptr(msg.msg_name), | |
67 | kmsg->msg_namelen, | |
68 | kmsg->msg_name); | |
69 | if (err < 0) | |
70 | return err; | |
71 | } | |
72 | } else { | |
73 | kmsg->msg_name = NULL; | |
74 | kmsg->msg_namelen = 0; | |
75 | } | |
76 | ||
77 | if (msg.msg_iovlen > UIO_MAXIOV) | |
78 | return -EMSGSIZE; | |
79 | ||
80 | kmsg->msg_iocb = NULL; | |
81 | ||
82 | return compat_import_iovec(save_addr ? READ : WRITE, | |
83 | compat_ptr(msg.msg_iov), msg.msg_iovlen, | |
84 | UIO_FASTIOV, iov, &kmsg->msg_iter); | |
85 | } | |
86 | ||
87 | /* Bleech... */ | |
88 | #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) | |
89 | ||
90 | #define CMSG_COMPAT_DATA(cmsg) \ | |
91 | ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr))) | |
92 | #define CMSG_COMPAT_SPACE(len) \ | |
93 | (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) | |
94 | #define CMSG_COMPAT_LEN(len) \ | |
95 | (sizeof(struct compat_cmsghdr) + (len)) | |
96 | ||
97 | #define CMSG_COMPAT_FIRSTHDR(msg) \ | |
98 | (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ | |
99 | (struct compat_cmsghdr __user *)((msg)->msg_control) : \ | |
100 | (struct compat_cmsghdr __user *)NULL) | |
101 | ||
102 | #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ | |
103 | ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ | |
104 | (ucmlen) <= (unsigned long) \ | |
105 | ((mhdr)->msg_controllen - \ | |
106 | ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) | |
107 | ||
108 | static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, | |
109 | struct compat_cmsghdr __user *cmsg, int cmsg_len) | |
110 | { | |
111 | char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); | |
112 | if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > | |
113 | msg->msg_controllen) | |
114 | return NULL; | |
115 | return (struct compat_cmsghdr __user *)ptr; | |
116 | } | |
117 | ||
118 | /* There is a lot of hair here because the alignment rules (and | |
119 | * thus placement) of cmsg headers and length are different for | |
120 | * 32-bit apps. -DaveM | |
121 | */ | |
122 | int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, | |
123 | unsigned char *stackbuf, int stackbuf_size) | |
124 | { | |
125 | struct compat_cmsghdr __user *ucmsg; | |
126 | struct cmsghdr *kcmsg, *kcmsg_base; | |
127 | compat_size_t ucmlen; | |
128 | __kernel_size_t kcmlen, tmp; | |
129 | int err = -EFAULT; | |
130 | ||
131 | BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != | |
132 | CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); | |
133 | ||
134 | kcmlen = 0; | |
135 | kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; | |
136 | ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); | |
137 | while (ucmsg != NULL) { | |
138 | if (get_user(ucmlen, &ucmsg->cmsg_len)) | |
139 | return -EFAULT; | |
140 | ||
141 | /* Catch bogons. */ | |
142 | if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) | |
143 | return -EINVAL; | |
144 | ||
145 | tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); | |
146 | tmp = CMSG_ALIGN(tmp); | |
147 | kcmlen += tmp; | |
148 | ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); | |
149 | } | |
150 | if (kcmlen == 0) | |
151 | return -EINVAL; | |
152 | ||
153 | /* The kcmlen holds the 64-bit version of the control length. | |
154 | * It may not be modified as we do not stick it into the kmsg | |
155 | * until we have successfully copied over all of the data | |
156 | * from the user. | |
157 | */ | |
158 | if (kcmlen > stackbuf_size) | |
159 | kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); | |
160 | if (kcmsg == NULL) | |
161 | return -ENOBUFS; | |
162 | ||
163 | /* Now copy them over neatly. */ | |
164 | memset(kcmsg, 0, kcmlen); | |
165 | ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); | |
166 | while (ucmsg != NULL) { | |
167 | if (__get_user(ucmlen, &ucmsg->cmsg_len)) | |
168 | goto Efault; | |
169 | if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) | |
170 | goto Einval; | |
171 | tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); | |
172 | if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) | |
173 | goto Einval; | |
174 | kcmsg->cmsg_len = tmp; | |
175 | tmp = CMSG_ALIGN(tmp); | |
176 | if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || | |
177 | __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || | |
178 | copy_from_user(CMSG_DATA(kcmsg), | |
179 | CMSG_COMPAT_DATA(ucmsg), | |
180 | (ucmlen - sizeof(*ucmsg)))) | |
181 | goto Efault; | |
182 | ||
183 | /* Advance. */ | |
184 | kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); | |
185 | ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); | |
186 | } | |
187 | ||
188 | /* | |
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 | ||
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 | ||
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 | fd_install(new_fd, get_file(fp[i])); | |
293 | } | |
294 | ||
295 | if (i > 0) { | |
296 | int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); | |
297 | err = put_user(SOL_SOCKET, &cm->cmsg_level); | |
298 | if (!err) | |
299 | err = put_user(SCM_RIGHTS, &cm->cmsg_type); | |
300 | if (!err) | |
301 | err = put_user(cmlen, &cm->cmsg_len); | |
302 | if (!err) { | |
303 | cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); | |
304 | kmsg->msg_control += cmlen; | |
305 | kmsg->msg_controllen -= cmlen; | |
306 | } | |
307 | } | |
308 | if (i < fdnum) | |
309 | kmsg->msg_flags |= MSG_CTRUNC; | |
310 | ||
311 | /* | |
312 | * All of the files that fit in the message have had their | |
313 | * usage counts incremented, so we just free the list. | |
314 | */ | |
315 | __scm_destroy(scm); | |
316 | } | |
317 | ||
318 | /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ | |
319 | struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) | |
320 | { | |
321 | struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; | |
322 | struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); | |
323 | struct compat_sock_fprog f32; | |
324 | struct sock_fprog f; | |
325 | ||
326 | if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) | |
327 | return NULL; | |
328 | memset(&f, 0, sizeof(f)); | |
329 | f.len = f32.len; | |
330 | f.filter = compat_ptr(f32.filter); | |
331 | if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) | |
332 | return NULL; | |
333 | ||
334 | return kfprog; | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); | |
337 | ||
338 | static int do_set_attach_filter(struct socket *sock, int level, int optname, | |
339 | char __user *optval, unsigned int optlen) | |
340 | { | |
341 | struct sock_fprog __user *kfprog; | |
342 | ||
343 | kfprog = get_compat_bpf_fprog(optval); | |
344 | if (!kfprog) | |
345 | return -EFAULT; | |
346 | ||
347 | return sock_setsockopt(sock, level, optname, (char __user *)kfprog, | |
348 | sizeof(struct sock_fprog)); | |
349 | } | |
350 | ||
351 | static int do_set_sock_timeout(struct socket *sock, int level, | |
352 | int optname, char __user *optval, unsigned int optlen) | |
353 | { | |
354 | struct compat_timeval __user *up = (struct compat_timeval __user *)optval; | |
355 | struct timeval ktime; | |
356 | mm_segment_t old_fs; | |
357 | int err; | |
358 | ||
359 | if (optlen < sizeof(*up)) | |
360 | return -EINVAL; | |
361 | if (!access_ok(VERIFY_READ, up, sizeof(*up)) || | |
362 | __get_user(ktime.tv_sec, &up->tv_sec) || | |
363 | __get_user(ktime.tv_usec, &up->tv_usec)) | |
364 | return -EFAULT; | |
365 | old_fs = get_fs(); | |
366 | set_fs(KERNEL_DS); | |
367 | err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); | |
368 | set_fs(old_fs); | |
369 | ||
370 | return err; | |
371 | } | |
372 | ||
373 | static int compat_sock_setsockopt(struct socket *sock, int level, int optname, | |
374 | char __user *optval, unsigned int optlen) | |
375 | { | |
376 | if (optname == SO_ATTACH_FILTER || | |
377 | optname == SO_ATTACH_REUSEPORT_CBPF) | |
378 | return do_set_attach_filter(sock, level, optname, | |
379 | optval, optlen); | |
380 | if (!COMPAT_USE_64BIT_TIME && | |
381 | (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 | static int __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 | COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, | |
415 | char __user *, optval, unsigned int, optlen) | |
416 | { | |
417 | return __compat_sys_setsockopt(fd, level, optname, optval, optlen); | |
418 | } | |
419 | ||
420 | static int do_get_sock_timeout(struct socket *sock, int level, int optname, | |
421 | char __user *optval, int __user *optlen) | |
422 | { | |
423 | struct compat_timeval __user *up; | |
424 | struct timeval ktime; | |
425 | mm_segment_t old_fs; | |
426 | int len, err; | |
427 | ||
428 | up = (struct compat_timeval __user *) optval; | |
429 | if (get_user(len, optlen)) | |
430 | return -EFAULT; | |
431 | if (len < sizeof(*up)) | |
432 | return -EINVAL; | |
433 | len = sizeof(ktime); | |
434 | old_fs = get_fs(); | |
435 | set_fs(KERNEL_DS); | |
436 | err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); | |
437 | set_fs(old_fs); | |
438 | ||
439 | if (!err) { | |
440 | if (put_user(sizeof(*up), optlen) || | |
441 | !access_ok(VERIFY_WRITE, up, sizeof(*up)) || | |
442 | __put_user(ktime.tv_sec, &up->tv_sec) || | |
443 | __put_user(ktime.tv_usec, &up->tv_usec)) | |
444 | err = -EFAULT; | |
445 | } | |
446 | return err; | |
447 | } | |
448 | ||
449 | static int compat_sock_getsockopt(struct socket *sock, int level, int optname, | |
450 | char __user *optval, int __user *optlen) | |
451 | { | |
452 | if (!COMPAT_USE_64BIT_TIME && | |
453 | (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) | |
454 | return do_get_sock_timeout(sock, level, optname, optval, optlen); | |
455 | return sock_getsockopt(sock, level, optname, optval, optlen); | |
456 | } | |
457 | ||
458 | int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
459 | { | |
460 | struct compat_timeval __user *ctv; | |
461 | int err; | |
462 | struct timeval tv; | |
463 | ||
464 | if (COMPAT_USE_64BIT_TIME) | |
465 | return sock_get_timestamp(sk, userstamp); | |
466 | ||
467 | ctv = (struct compat_timeval __user *) userstamp; | |
468 | err = -ENOENT; | |
469 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
470 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); | |
471 | tv = ktime_to_timeval(sk->sk_stamp); | |
472 | if (tv.tv_sec == -1) | |
473 | return err; | |
474 | if (tv.tv_sec == 0) { | |
475 | sk->sk_stamp = ktime_get_real(); | |
476 | tv = ktime_to_timeval(sk->sk_stamp); | |
477 | } | |
478 | err = 0; | |
479 | if (put_user(tv.tv_sec, &ctv->tv_sec) || | |
480 | put_user(tv.tv_usec, &ctv->tv_usec)) | |
481 | err = -EFAULT; | |
482 | return err; | |
483 | } | |
484 | EXPORT_SYMBOL(compat_sock_get_timestamp); | |
485 | ||
486 | int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) | |
487 | { | |
488 | struct compat_timespec __user *ctv; | |
489 | int err; | |
490 | struct timespec ts; | |
491 | ||
492 | if (COMPAT_USE_64BIT_TIME) | |
493 | return sock_get_timestampns (sk, userstamp); | |
494 | ||
495 | ctv = (struct compat_timespec __user *) userstamp; | |
496 | err = -ENOENT; | |
497 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
498 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); | |
499 | ts = ktime_to_timespec(sk->sk_stamp); | |
500 | if (ts.tv_sec == -1) | |
501 | return err; | |
502 | if (ts.tv_sec == 0) { | |
503 | sk->sk_stamp = ktime_get_real(); | |
504 | ts = ktime_to_timespec(sk->sk_stamp); | |
505 | } | |
506 | err = 0; | |
507 | if (put_user(ts.tv_sec, &ctv->tv_sec) || | |
508 | put_user(ts.tv_nsec, &ctv->tv_nsec)) | |
509 | err = -EFAULT; | |
510 | return err; | |
511 | } | |
512 | EXPORT_SYMBOL(compat_sock_get_timestampns); | |
513 | ||
514 | static int __compat_sys_getsockopt(int fd, int level, int optname, | |
515 | char __user *optval, | |
516 | int __user *optlen) | |
517 | { | |
518 | int err; | |
519 | struct socket *sock = sockfd_lookup(fd, &err); | |
520 | ||
521 | if (sock) { | |
522 | err = security_socket_getsockopt(sock, level, optname); | |
523 | if (err) { | |
524 | sockfd_put(sock); | |
525 | return err; | |
526 | } | |
527 | ||
528 | if (level == SOL_SOCKET) | |
529 | err = compat_sock_getsockopt(sock, level, | |
530 | optname, optval, optlen); | |
531 | else if (sock->ops->compat_getsockopt) | |
532 | err = sock->ops->compat_getsockopt(sock, level, | |
533 | optname, optval, optlen); | |
534 | else | |
535 | err = sock->ops->getsockopt(sock, level, | |
536 | optname, optval, optlen); | |
537 | sockfd_put(sock); | |
538 | } | |
539 | return err; | |
540 | } | |
541 | ||
542 | COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, | |
543 | char __user *, optval, int __user *, optlen) | |
544 | { | |
545 | return __compat_sys_getsockopt(fd, level, optname, optval, optlen); | |
546 | } | |
547 | ||
548 | struct compat_group_req { | |
549 | __u32 gr_interface; | |
550 | struct __kernel_sockaddr_storage gr_group | |
551 | __aligned(4); | |
552 | } __packed; | |
553 | ||
554 | struct compat_group_source_req { | |
555 | __u32 gsr_interface; | |
556 | struct __kernel_sockaddr_storage gsr_group | |
557 | __aligned(4); | |
558 | struct __kernel_sockaddr_storage gsr_source | |
559 | __aligned(4); | |
560 | } __packed; | |
561 | ||
562 | struct compat_group_filter { | |
563 | __u32 gf_interface; | |
564 | struct __kernel_sockaddr_storage gf_group | |
565 | __aligned(4); | |
566 | __u32 gf_fmode; | |
567 | __u32 gf_numsrc; | |
568 | struct __kernel_sockaddr_storage gf_slist[1] | |
569 | __aligned(4); | |
570 | } __packed; | |
571 | ||
572 | #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ | |
573 | sizeof(struct __kernel_sockaddr_storage)) | |
574 | ||
575 | ||
576 | int compat_mc_setsockopt(struct sock *sock, int level, int optname, | |
577 | char __user *optval, unsigned int optlen, | |
578 | int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) | |
579 | { | |
580 | char __user *koptval = optval; | |
581 | int koptlen = optlen; | |
582 | ||
583 | switch (optname) { | |
584 | case MCAST_JOIN_GROUP: | |
585 | case MCAST_LEAVE_GROUP: | |
586 | { | |
587 | struct compat_group_req __user *gr32 = (void *)optval; | |
588 | struct group_req __user *kgr = | |
589 | compat_alloc_user_space(sizeof(struct group_req)); | |
590 | u32 interface; | |
591 | ||
592 | if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || | |
593 | !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || | |
594 | __get_user(interface, &gr32->gr_interface) || | |
595 | __put_user(interface, &kgr->gr_interface) || | |
596 | copy_in_user(&kgr->gr_group, &gr32->gr_group, | |
597 | sizeof(kgr->gr_group))) | |
598 | return -EFAULT; | |
599 | koptval = (char __user *)kgr; | |
600 | koptlen = sizeof(struct group_req); | |
601 | break; | |
602 | } | |
603 | case MCAST_JOIN_SOURCE_GROUP: | |
604 | case MCAST_LEAVE_SOURCE_GROUP: | |
605 | case MCAST_BLOCK_SOURCE: | |
606 | case MCAST_UNBLOCK_SOURCE: | |
607 | { | |
608 | struct compat_group_source_req __user *gsr32 = (void *)optval; | |
609 | struct group_source_req __user *kgsr = compat_alloc_user_space( | |
610 | sizeof(struct group_source_req)); | |
611 | u32 interface; | |
612 | ||
613 | if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || | |
614 | !access_ok(VERIFY_WRITE, kgsr, | |
615 | sizeof(struct group_source_req)) || | |
616 | __get_user(interface, &gsr32->gsr_interface) || | |
617 | __put_user(interface, &kgsr->gsr_interface) || | |
618 | copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, | |
619 | sizeof(kgsr->gsr_group)) || | |
620 | copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, | |
621 | sizeof(kgsr->gsr_source))) | |
622 | return -EFAULT; | |
623 | koptval = (char __user *)kgsr; | |
624 | koptlen = sizeof(struct group_source_req); | |
625 | break; | |
626 | } | |
627 | case MCAST_MSFILTER: | |
628 | { | |
629 | struct compat_group_filter __user *gf32 = (void *)optval; | |
630 | struct group_filter __user *kgf; | |
631 | u32 interface, fmode, numsrc; | |
632 | ||
633 | if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || | |
634 | __get_user(interface, &gf32->gf_interface) || | |
635 | __get_user(fmode, &gf32->gf_fmode) || | |
636 | __get_user(numsrc, &gf32->gf_numsrc)) | |
637 | return -EFAULT; | |
638 | koptlen = optlen + sizeof(struct group_filter) - | |
639 | sizeof(struct compat_group_filter); | |
640 | if (koptlen < GROUP_FILTER_SIZE(numsrc)) | |
641 | return -EINVAL; | |
642 | kgf = compat_alloc_user_space(koptlen); | |
643 | if (!access_ok(VERIFY_WRITE, kgf, koptlen) || | |
644 | __put_user(interface, &kgf->gf_interface) || | |
645 | __put_user(fmode, &kgf->gf_fmode) || | |
646 | __put_user(numsrc, &kgf->gf_numsrc) || | |
647 | copy_in_user(&kgf->gf_group, &gf32->gf_group, | |
648 | sizeof(kgf->gf_group)) || | |
649 | (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, | |
650 | numsrc * sizeof(kgf->gf_slist[0])))) | |
651 | return -EFAULT; | |
652 | koptval = (char __user *)kgf; | |
653 | break; | |
654 | } | |
655 | ||
656 | default: | |
657 | break; | |
658 | } | |
659 | return setsockopt(sock, level, optname, koptval, koptlen); | |
660 | } | |
661 | EXPORT_SYMBOL(compat_mc_setsockopt); | |
662 | ||
663 | int compat_mc_getsockopt(struct sock *sock, int level, int optname, | |
664 | char __user *optval, int __user *optlen, | |
665 | int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) | |
666 | { | |
667 | struct compat_group_filter __user *gf32 = (void *)optval; | |
668 | struct group_filter __user *kgf; | |
669 | int __user *koptlen; | |
670 | u32 interface, fmode, numsrc; | |
671 | int klen, ulen, err; | |
672 | ||
673 | if (optname != MCAST_MSFILTER) | |
674 | return getsockopt(sock, level, optname, optval, optlen); | |
675 | ||
676 | koptlen = compat_alloc_user_space(sizeof(*koptlen)); | |
677 | if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || | |
678 | __get_user(ulen, optlen)) | |
679 | return -EFAULT; | |
680 | ||
681 | /* adjust len for pad */ | |
682 | klen = ulen + sizeof(*kgf) - sizeof(*gf32); | |
683 | ||
684 | if (klen < GROUP_FILTER_SIZE(0)) | |
685 | return -EINVAL; | |
686 | ||
687 | if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || | |
688 | __put_user(klen, koptlen)) | |
689 | return -EFAULT; | |
690 | ||
691 | /* have to allow space for previous compat_alloc_user_space, too */ | |
692 | kgf = compat_alloc_user_space(klen+sizeof(*optlen)); | |
693 | ||
694 | if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || | |
695 | __get_user(interface, &gf32->gf_interface) || | |
696 | __get_user(fmode, &gf32->gf_fmode) || | |
697 | __get_user(numsrc, &gf32->gf_numsrc) || | |
698 | __put_user(interface, &kgf->gf_interface) || | |
699 | __put_user(fmode, &kgf->gf_fmode) || | |
700 | __put_user(numsrc, &kgf->gf_numsrc) || | |
701 | copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) | |
702 | return -EFAULT; | |
703 | ||
704 | err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); | |
705 | if (err) | |
706 | return err; | |
707 | ||
708 | if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || | |
709 | __get_user(klen, koptlen)) | |
710 | return -EFAULT; | |
711 | ||
712 | ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); | |
713 | ||
714 | if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || | |
715 | __put_user(ulen, optlen)) | |
716 | return -EFAULT; | |
717 | ||
718 | if (!access_ok(VERIFY_READ, kgf, klen) || | |
719 | !access_ok(VERIFY_WRITE, gf32, ulen) || | |
720 | __get_user(interface, &kgf->gf_interface) || | |
721 | __get_user(fmode, &kgf->gf_fmode) || | |
722 | __get_user(numsrc, &kgf->gf_numsrc) || | |
723 | __put_user(interface, &gf32->gf_interface) || | |
724 | __put_user(fmode, &gf32->gf_fmode) || | |
725 | __put_user(numsrc, &gf32->gf_numsrc)) | |
726 | return -EFAULT; | |
727 | if (numsrc) { | |
728 | int copylen; | |
729 | ||
730 | klen -= GROUP_FILTER_SIZE(0); | |
731 | copylen = numsrc * sizeof(gf32->gf_slist[0]); | |
732 | if (copylen > klen) | |
733 | copylen = klen; | |
734 | if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) | |
735 | return -EFAULT; | |
736 | } | |
737 | return err; | |
738 | } | |
739 | EXPORT_SYMBOL(compat_mc_getsockopt); | |
740 | ||
741 | ||
742 | /* Argument list sizes for compat_sys_socketcall */ | |
743 | #define AL(x) ((x) * sizeof(u32)) | |
744 | static unsigned char nas[21] = { | |
745 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), | |
746 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
747 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
748 | AL(4), AL(5), AL(4) | |
749 | }; | |
750 | #undef AL | |
751 | ||
752 | static inline long __compat_sys_sendmsg(int fd, | |
753 | struct compat_msghdr __user *msg, | |
754 | unsigned int flags) | |
755 | { | |
756 | return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, | |
757 | flags | MSG_CMSG_COMPAT, false); | |
758 | } | |
759 | ||
760 | COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, | |
761 | unsigned int, flags) | |
762 | { | |
763 | return __compat_sys_sendmsg(fd, msg, flags); | |
764 | } | |
765 | ||
766 | static inline long __compat_sys_sendmmsg(int fd, | |
767 | struct compat_mmsghdr __user *mmsg, | |
768 | unsigned int vlen, unsigned int flags) | |
769 | { | |
770 | return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, | |
771 | flags | MSG_CMSG_COMPAT, false); | |
772 | } | |
773 | ||
774 | COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, | |
775 | unsigned int, vlen, unsigned int, flags) | |
776 | { | |
777 | return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); | |
778 | } | |
779 | ||
780 | static inline long __compat_sys_recvmsg(int fd, | |
781 | struct compat_msghdr __user *msg, | |
782 | unsigned int flags) | |
783 | { | |
784 | return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, | |
785 | flags | MSG_CMSG_COMPAT, false); | |
786 | } | |
787 | ||
788 | COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, | |
789 | unsigned int, flags) | |
790 | { | |
791 | return __compat_sys_recvmsg(fd, msg, flags); | |
792 | } | |
793 | ||
794 | static inline long __compat_sys_recvfrom(int fd, void __user *buf, | |
795 | compat_size_t len, unsigned int flags, | |
796 | struct sockaddr __user *addr, | |
797 | int __user *addrlen) | |
798 | { | |
799 | return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, | |
800 | addrlen); | |
801 | } | |
802 | ||
803 | COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) | |
804 | { | |
805 | return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); | |
806 | } | |
807 | ||
808 | COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, | |
809 | unsigned int, flags, struct sockaddr __user *, addr, | |
810 | int __user *, addrlen) | |
811 | { | |
812 | return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); | |
813 | } | |
814 | ||
815 | static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, | |
816 | unsigned int vlen, unsigned int flags, | |
817 | struct compat_timespec __user *timeout) | |
818 | { | |
819 | int datagrams; | |
820 | struct timespec ktspec; | |
821 | ||
822 | if (timeout == NULL) | |
823 | return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, | |
824 | flags | MSG_CMSG_COMPAT, NULL); | |
825 | ||
826 | if (compat_get_timespec(&ktspec, timeout)) | |
827 | return -EFAULT; | |
828 | ||
829 | datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, | |
830 | flags | MSG_CMSG_COMPAT, &ktspec); | |
831 | if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) | |
832 | datagrams = -EFAULT; | |
833 | ||
834 | return datagrams; | |
835 | } | |
836 | ||
837 | COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, | |
838 | unsigned int, vlen, unsigned int, flags, | |
839 | struct compat_timespec __user *, timeout) | |
840 | { | |
841 | return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout); | |
842 | } | |
843 | ||
844 | COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) | |
845 | { | |
846 | u32 a[AUDITSC_ARGS]; | |
847 | unsigned int len; | |
848 | u32 a0, a1; | |
849 | int ret; | |
850 | ||
851 | if (call < SYS_SOCKET || call > SYS_SENDMMSG) | |
852 | return -EINVAL; | |
853 | len = nas[call]; | |
854 | if (len > sizeof(a)) | |
855 | return -EINVAL; | |
856 | ||
857 | if (copy_from_user(a, args, len)) | |
858 | return -EFAULT; | |
859 | ||
860 | ret = audit_socketcall_compat(len / sizeof(a[0]), a); | |
861 | if (ret) | |
862 | return ret; | |
863 | ||
864 | a0 = a[0]; | |
865 | a1 = a[1]; | |
866 | ||
867 | switch (call) { | |
868 | case SYS_SOCKET: | |
869 | ret = __sys_socket(a0, a1, a[2]); | |
870 | break; | |
871 | case SYS_BIND: | |
872 | ret = __sys_bind(a0, compat_ptr(a1), a[2]); | |
873 | break; | |
874 | case SYS_CONNECT: | |
875 | ret = __sys_connect(a0, compat_ptr(a1), a[2]); | |
876 | break; | |
877 | case SYS_LISTEN: | |
878 | ret = __sys_listen(a0, a1); | |
879 | break; | |
880 | case SYS_ACCEPT: | |
881 | ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); | |
882 | break; | |
883 | case SYS_GETSOCKNAME: | |
884 | ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); | |
885 | break; | |
886 | case SYS_GETPEERNAME: | |
887 | ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); | |
888 | break; | |
889 | case SYS_SOCKETPAIR: | |
890 | ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); | |
891 | break; | |
892 | case SYS_SEND: | |
893 | ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); | |
894 | break; | |
895 | case SYS_SENDTO: | |
896 | ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], | |
897 | compat_ptr(a[4]), a[5]); | |
898 | break; | |
899 | case SYS_RECV: | |
900 | ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], | |
901 | NULL, NULL); | |
902 | break; | |
903 | case SYS_RECVFROM: | |
904 | ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], | |
905 | compat_ptr(a[4]), | |
906 | compat_ptr(a[5])); | |
907 | break; | |
908 | case SYS_SHUTDOWN: | |
909 | ret = __sys_shutdown(a0, a1); | |
910 | break; | |
911 | case SYS_SETSOCKOPT: | |
912 | ret = __compat_sys_setsockopt(a0, a1, a[2], | |
913 | compat_ptr(a[3]), a[4]); | |
914 | break; | |
915 | case SYS_GETSOCKOPT: | |
916 | ret = __compat_sys_getsockopt(a0, a1, a[2], | |
917 | compat_ptr(a[3]), | |
918 | compat_ptr(a[4])); | |
919 | break; | |
920 | case SYS_SENDMSG: | |
921 | ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); | |
922 | break; | |
923 | case SYS_SENDMMSG: | |
924 | ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); | |
925 | break; | |
926 | case SYS_RECVMSG: | |
927 | ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); | |
928 | break; | |
929 | case SYS_RECVMMSG: | |
930 | ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], | |
931 | compat_ptr(a[4])); | |
932 | break; | |
933 | case SYS_ACCEPT4: | |
934 | ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); | |
935 | break; | |
936 | default: | |
937 | ret = -EINVAL; | |
938 | break; | |
939 | } | |
940 | return ret; | |
941 | } |