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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
4 *
5 * Copyright (C) 2000 VA Linux Co
6 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
7 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
10 * Copyright (C) 2000 Hewlett-Packard Co.
11 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
12 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs
13 */
14
15#include <linux/kernel.h>
16#include <linux/gfp.h>
17#include <linux/fs.h>
18#include <linux/types.h>
19#include <linux/file.h>
20#include <linux/icmpv6.h>
21#include <linux/socket.h>
22#include <linux/syscalls.h>
23#include <linux/filter.h>
24#include <linux/compat.h>
25#include <linux/security.h>
26#include <linux/audit.h>
27#include <linux/export.h>
28
29#include <net/scm.h>
30#include <net/sock.h>
31#include <net/ip.h>
32#include <net/ipv6.h>
33#include <linux/uaccess.h>
34#include <net/compat.h>
35
36int __get_compat_msghdr(struct msghdr *kmsg,
37 struct compat_msghdr *msg,
38 struct sockaddr __user **save_addr)
39{
40 ssize_t err;
41
42 kmsg->msg_flags = msg->msg_flags;
43 kmsg->msg_namelen = msg->msg_namelen;
44
45 if (!msg->msg_name)
46 kmsg->msg_namelen = 0;
47
48 if (kmsg->msg_namelen < 0)
49 return -EINVAL;
50
51 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
52 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
53
54 kmsg->msg_control_is_user = true;
55 kmsg->msg_get_inq = 0;
56 kmsg->msg_control_user = compat_ptr(msg->msg_control);
57 kmsg->msg_controllen = msg->msg_controllen;
58
59 if (save_addr)
60 *save_addr = compat_ptr(msg->msg_name);
61
62 if (msg->msg_name && kmsg->msg_namelen) {
63 if (!save_addr) {
64 err = move_addr_to_kernel(compat_ptr(msg->msg_name),
65 kmsg->msg_namelen,
66 kmsg->msg_name);
67 if (err < 0)
68 return err;
69 }
70 } else {
71 kmsg->msg_name = NULL;
72 kmsg->msg_namelen = 0;
73 }
74
75 if (msg->msg_iovlen > UIO_MAXIOV)
76 return -EMSGSIZE;
77
78 kmsg->msg_iocb = NULL;
79 kmsg->msg_ubuf = NULL;
80 return 0;
81}
82
83int get_compat_msghdr(struct msghdr *kmsg,
84 struct compat_msghdr __user *umsg,
85 struct sockaddr __user **save_addr,
86 struct iovec **iov)
87{
88 struct compat_msghdr msg;
89 ssize_t err;
90
91 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
92 return -EFAULT;
93
94 err = __get_compat_msghdr(kmsg, &msg, save_addr);
95 if (err)
96 return err;
97
98 err = import_iovec(save_addr ? ITER_DEST : ITER_SOURCE,
99 compat_ptr(msg.msg_iov), msg.msg_iovlen,
100 UIO_FASTIOV, iov, &kmsg->msg_iter);
101 return err < 0 ? err : 0;
102}
103
104/* Bleech... */
105#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
106
107#define CMSG_COMPAT_DATA(cmsg) \
108 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
109#define CMSG_COMPAT_SPACE(len) \
110 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
111#define CMSG_COMPAT_LEN(len) \
112 (sizeof(struct compat_cmsghdr) + (len))
113
114#define CMSG_COMPAT_FIRSTHDR(msg) \
115 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
116 (struct compat_cmsghdr __user *)((msg)->msg_control_user) : \
117 (struct compat_cmsghdr __user *)NULL)
118
119#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
120 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
121 (ucmlen) <= (unsigned long) \
122 ((mhdr)->msg_controllen - \
123 ((char __user *)(ucmsg) - (char __user *)(mhdr)->msg_control_user)))
124
125static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
126 struct compat_cmsghdr __user *cmsg, int cmsg_len)
127{
128 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
129 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control_user) >
130 msg->msg_controllen)
131 return NULL;
132 return (struct compat_cmsghdr __user *)ptr;
133}
134
135/* There is a lot of hair here because the alignment rules (and
136 * thus placement) of cmsg headers and length are different for
137 * 32-bit apps. -DaveM
138 */
139int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
140 unsigned char *stackbuf, int stackbuf_size)
141{
142 struct compat_cmsghdr __user *ucmsg;
143 struct cmsghdr *kcmsg, *kcmsg_base;
144 compat_size_t ucmlen;
145 __kernel_size_t kcmlen, tmp;
146 int err = -EFAULT;
147
148 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
149 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
150
151 kcmlen = 0;
152 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
153 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
154 while (ucmsg != NULL) {
155 if (get_user(ucmlen, &ucmsg->cmsg_len))
156 return -EFAULT;
157
158 /* Catch bogons. */
159 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
160 return -EINVAL;
161
162 tmp = ((ucmlen - sizeof(*ucmsg)) + 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 -ENOMEM;
179
180 /* Now copy them over neatly. */
181 memset(kcmsg, 0, kcmlen);
182 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
183 while (ucmsg != NULL) {
184 struct compat_cmsghdr cmsg;
185 if (copy_from_user(&cmsg, ucmsg, sizeof(cmsg)))
186 goto Efault;
187 if (!CMSG_COMPAT_OK(cmsg.cmsg_len, ucmsg, kmsg))
188 goto Einval;
189 tmp = ((cmsg.cmsg_len - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
190 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
191 goto Einval;
192 kcmsg->cmsg_len = tmp;
193 kcmsg->cmsg_level = cmsg.cmsg_level;
194 kcmsg->cmsg_type = cmsg.cmsg_type;
195 tmp = CMSG_ALIGN(tmp);
196 if (copy_from_user(CMSG_DATA(kcmsg),
197 CMSG_COMPAT_DATA(ucmsg),
198 (cmsg.cmsg_len - sizeof(*ucmsg))))
199 goto Efault;
200
201 /* Advance. */
202 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
203 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, cmsg.cmsg_len);
204 }
205
206 /*
207 * check the length of messages copied in is the same as the
208 * what we get from the first loop
209 */
210 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
211 goto Einval;
212
213 /* Ok, looks like we made it. Hook it up and return success. */
214 kmsg->msg_control_is_user = false;
215 kmsg->msg_control = kcmsg_base;
216 kmsg->msg_controllen = kcmlen;
217 return 0;
218
219Einval:
220 err = -EINVAL;
221Efault:
222 if (kcmsg_base != (struct cmsghdr *)stackbuf)
223 sock_kfree_s(sk, kcmsg_base, kcmlen);
224 return err;
225}
226
227int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
228{
229 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control_user;
230 struct compat_cmsghdr cmhdr;
231 struct old_timeval32 ctv;
232 struct old_timespec32 cts[3];
233 int cmlen;
234
235 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
236 kmsg->msg_flags |= MSG_CTRUNC;
237 return 0; /* XXX: return error? check spec. */
238 }
239
240 if (!COMPAT_USE_64BIT_TIME) {
241 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) {
242 struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data;
243 ctv.tv_sec = tv->tv_sec;
244 ctv.tv_usec = tv->tv_usec;
245 data = &ctv;
246 len = sizeof(ctv);
247 }
248 if (level == SOL_SOCKET &&
249 (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) {
250 int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3;
251 int i;
252 struct __kernel_old_timespec *ts = data;
253 for (i = 0; i < count; i++) {
254 cts[i].tv_sec = ts[i].tv_sec;
255 cts[i].tv_nsec = ts[i].tv_nsec;
256 }
257 data = &cts;
258 len = sizeof(cts[0]) * count;
259 }
260 }
261
262 cmlen = CMSG_COMPAT_LEN(len);
263 if (kmsg->msg_controllen < cmlen) {
264 kmsg->msg_flags |= MSG_CTRUNC;
265 cmlen = kmsg->msg_controllen;
266 }
267 cmhdr.cmsg_level = level;
268 cmhdr.cmsg_type = type;
269 cmhdr.cmsg_len = cmlen;
270
271 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
272 return -EFAULT;
273 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
274 return -EFAULT;
275 cmlen = CMSG_COMPAT_SPACE(len);
276 if (kmsg->msg_controllen < cmlen)
277 cmlen = kmsg->msg_controllen;
278 kmsg->msg_control_user += cmlen;
279 kmsg->msg_controllen -= cmlen;
280 return 0;
281}
282
283static int scm_max_fds_compat(struct msghdr *msg)
284{
285 if (msg->msg_controllen <= sizeof(struct compat_cmsghdr))
286 return 0;
287 return (msg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
288}
289
290void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
291{
292 struct compat_cmsghdr __user *cm =
293 (struct compat_cmsghdr __user *)msg->msg_control_user;
294 unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
295 int fdmax = min_t(int, scm_max_fds_compat(msg), scm->fp->count);
296 int __user *cmsg_data = CMSG_COMPAT_DATA(cm);
297 int err = 0, i;
298
299 for (i = 0; i < fdmax; i++) {
300 err = scm_recv_one_fd(scm->fp->fp[i], cmsg_data + i, o_flags);
301 if (err < 0)
302 break;
303 }
304
305 if (i > 0) {
306 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
307
308 err = put_user(SOL_SOCKET, &cm->cmsg_level);
309 if (!err)
310 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
311 if (!err)
312 err = put_user(cmlen, &cm->cmsg_len);
313 if (!err) {
314 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
315 if (msg->msg_controllen < cmlen)
316 cmlen = msg->msg_controllen;
317 msg->msg_control_user += cmlen;
318 msg->msg_controllen -= cmlen;
319 }
320 }
321
322 if (i < scm->fp->count || (scm->fp->count && fdmax <= 0))
323 msg->msg_flags |= MSG_CTRUNC;
324
325 /*
326 * All of the files that fit in the message have had their usage counts
327 * incremented, so we just free the list.
328 */
329 __scm_destroy(scm);
330}
331
332/* Argument list sizes for compat_sys_socketcall */
333#define AL(x) ((x) * sizeof(u32))
334static unsigned char nas[21] = {
335 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
336 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
337 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
338 AL(4), AL(5), AL(4)
339};
340#undef AL
341
342static inline long __compat_sys_sendmsg(int fd,
343 struct compat_msghdr __user *msg,
344 unsigned int flags)
345{
346 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
347 flags | MSG_CMSG_COMPAT, false);
348}
349
350COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
351 unsigned int, flags)
352{
353 return __compat_sys_sendmsg(fd, msg, flags);
354}
355
356static inline long __compat_sys_sendmmsg(int fd,
357 struct compat_mmsghdr __user *mmsg,
358 unsigned int vlen, unsigned int flags)
359{
360 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
361 flags | MSG_CMSG_COMPAT, false);
362}
363
364COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
365 unsigned int, vlen, unsigned int, flags)
366{
367 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
368}
369
370static inline long __compat_sys_recvmsg(int fd,
371 struct compat_msghdr __user *msg,
372 unsigned int flags)
373{
374 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
375 flags | MSG_CMSG_COMPAT, false);
376}
377
378COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
379 unsigned int, flags)
380{
381 return __compat_sys_recvmsg(fd, msg, flags);
382}
383
384static inline long __compat_sys_recvfrom(int fd, void __user *buf,
385 compat_size_t len, unsigned int flags,
386 struct sockaddr __user *addr,
387 int __user *addrlen)
388{
389 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
390 addrlen);
391}
392
393COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
394{
395 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
396}
397
398COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
399 unsigned int, flags, struct sockaddr __user *, addr,
400 int __user *, addrlen)
401{
402 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
403}
404
405COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg,
406 unsigned int, vlen, unsigned int, flags,
407 struct __kernel_timespec __user *, timeout)
408{
409 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
410 flags | MSG_CMSG_COMPAT, timeout, NULL);
411}
412
413#ifdef CONFIG_COMPAT_32BIT_TIME
414COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg,
415 unsigned int, vlen, unsigned int, flags,
416 struct old_timespec32 __user *, timeout)
417{
418 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
419 flags | MSG_CMSG_COMPAT, NULL, timeout);
420}
421#endif
422
423COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
424{
425 u32 a[AUDITSC_ARGS];
426 unsigned int len;
427 u32 a0, a1;
428 int ret;
429
430 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
431 return -EINVAL;
432 len = nas[call];
433 if (len > sizeof(a))
434 return -EINVAL;
435
436 if (copy_from_user(a, args, len))
437 return -EFAULT;
438
439 ret = audit_socketcall_compat(len / sizeof(a[0]), a);
440 if (ret)
441 return ret;
442
443 a0 = a[0];
444 a1 = a[1];
445
446 switch (call) {
447 case SYS_SOCKET:
448 ret = __sys_socket(a0, a1, a[2]);
449 break;
450 case SYS_BIND:
451 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
452 break;
453 case SYS_CONNECT:
454 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
455 break;
456 case SYS_LISTEN:
457 ret = __sys_listen(a0, a1);
458 break;
459 case SYS_ACCEPT:
460 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
461 break;
462 case SYS_GETSOCKNAME:
463 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
464 break;
465 case SYS_GETPEERNAME:
466 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
467 break;
468 case SYS_SOCKETPAIR:
469 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
470 break;
471 case SYS_SEND:
472 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
473 break;
474 case SYS_SENDTO:
475 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
476 compat_ptr(a[4]), a[5]);
477 break;
478 case SYS_RECV:
479 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
480 NULL, NULL);
481 break;
482 case SYS_RECVFROM:
483 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
484 compat_ptr(a[4]),
485 compat_ptr(a[5]));
486 break;
487 case SYS_SHUTDOWN:
488 ret = __sys_shutdown(a0, a1);
489 break;
490 case SYS_SETSOCKOPT:
491 ret = __sys_setsockopt(a0, a1, a[2], compat_ptr(a[3]), a[4]);
492 break;
493 case SYS_GETSOCKOPT:
494 ret = __sys_getsockopt(a0, a1, a[2], compat_ptr(a[3]),
495 compat_ptr(a[4]));
496 break;
497 case SYS_SENDMSG:
498 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
499 break;
500 case SYS_SENDMMSG:
501 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
502 break;
503 case SYS_RECVMSG:
504 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
505 break;
506 case SYS_RECVMMSG:
507 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2],
508 a[3] | MSG_CMSG_COMPAT, NULL,
509 compat_ptr(a[4]));
510 break;
511 case SYS_ACCEPT4:
512 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
513 break;
514 default:
515 ret = -EINVAL;
516 break;
517 }
518 return ret;
519}
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
34int get_compat_msghdr(struct msghdr *kmsg,
35 struct compat_msghdr __user *umsg,
36 struct sockaddr __user **save_addr,
37 struct iovec **iov)
38{
39 compat_uptr_t uaddr, uiov, tmp3;
40 compat_size_t nr_segs;
41 ssize_t err;
42
43 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
44 __get_user(uaddr, &umsg->msg_name) ||
45 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
46 __get_user(uiov, &umsg->msg_iov) ||
47 __get_user(nr_segs, &umsg->msg_iovlen) ||
48 __get_user(tmp3, &umsg->msg_control) ||
49 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
50 __get_user(kmsg->msg_flags, &umsg->msg_flags))
51 return -EFAULT;
52
53 if (!uaddr)
54 kmsg->msg_namelen = 0;
55
56 if (kmsg->msg_namelen < 0)
57 return -EINVAL;
58
59 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
60 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
61 kmsg->msg_control = compat_ptr(tmp3);
62
63 if (save_addr)
64 *save_addr = compat_ptr(uaddr);
65
66 if (uaddr && kmsg->msg_namelen) {
67 if (!save_addr) {
68 err = move_addr_to_kernel(compat_ptr(uaddr),
69 kmsg->msg_namelen,
70 kmsg->msg_name);
71 if (err < 0)
72 return err;
73 }
74 } else {
75 kmsg->msg_name = NULL;
76 kmsg->msg_namelen = 0;
77 }
78
79 if (nr_segs > UIO_MAXIOV)
80 return -EMSGSIZE;
81
82 kmsg->msg_iocb = NULL;
83
84 return compat_import_iovec(save_addr ? READ : WRITE,
85 compat_ptr(uiov), nr_segs,
86 UIO_FASTIOV, iov, &kmsg->msg_iter);
87}
88
89/* Bleech... */
90#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
91
92#define CMSG_COMPAT_DATA(cmsg) \
93 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
94#define CMSG_COMPAT_SPACE(len) \
95 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
96#define CMSG_COMPAT_LEN(len) \
97 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
98
99#define CMSG_COMPAT_FIRSTHDR(msg) \
100 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
101 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
102 (struct compat_cmsghdr __user *)NULL)
103
104#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
105 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
106 (ucmlen) <= (unsigned long) \
107 ((mhdr)->msg_controllen - \
108 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
109
110static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
111 struct compat_cmsghdr __user *cmsg, int cmsg_len)
112{
113 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
114 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
115 msg->msg_controllen)
116 return NULL;
117 return (struct compat_cmsghdr __user *)ptr;
118}
119
120/* There is a lot of hair here because the alignment rules (and
121 * thus placement) of cmsg headers and length are different for
122 * 32-bit apps. -DaveM
123 */
124int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
125 unsigned char *stackbuf, int stackbuf_size)
126{
127 struct compat_cmsghdr __user *ucmsg;
128 struct cmsghdr *kcmsg, *kcmsg_base;
129 compat_size_t ucmlen;
130 __kernel_size_t kcmlen, tmp;
131 int err = -EFAULT;
132
133 kcmlen = 0;
134 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
135 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
136 while (ucmsg != NULL) {
137 if (get_user(ucmlen, &ucmsg->cmsg_len))
138 return -EFAULT;
139
140 /* Catch bogons. */
141 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
142 return -EINVAL;
143
144 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
145 CMSG_ALIGN(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 - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
172 CMSG_ALIGN(sizeof(struct cmsghdr)));
173 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
174 goto Einval;
175 kcmsg->cmsg_len = tmp;
176 tmp = CMSG_ALIGN(tmp);
177 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
178 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
179 copy_from_user(CMSG_DATA(kcmsg),
180 CMSG_COMPAT_DATA(ucmsg),
181 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
182 goto Efault;
183
184 /* Advance. */
185 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
186 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
187 }
188
189 /* Ok, looks like we made it. Hook it up and return success. */
190 kmsg->msg_control = kcmsg_base;
191 kmsg->msg_controllen = kcmlen;
192 return 0;
193
194Einval:
195 err = -EINVAL;
196Efault:
197 if (kcmsg_base != (struct cmsghdr *)stackbuf)
198 sock_kfree_s(sk, kcmsg_base, kcmlen);
199 return err;
200}
201
202int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
203{
204 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
205 struct compat_cmsghdr cmhdr;
206 struct compat_timeval ctv;
207 struct compat_timespec cts[3];
208 int cmlen;
209
210 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
211 kmsg->msg_flags |= MSG_CTRUNC;
212 return 0; /* XXX: return error? check spec. */
213 }
214
215 if (!COMPAT_USE_64BIT_TIME) {
216 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
217 struct timeval *tv = (struct timeval *)data;
218 ctv.tv_sec = tv->tv_sec;
219 ctv.tv_usec = tv->tv_usec;
220 data = &ctv;
221 len = sizeof(ctv);
222 }
223 if (level == SOL_SOCKET &&
224 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
225 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
226 int i;
227 struct timespec *ts = (struct timespec *)data;
228 for (i = 0; i < count; i++) {
229 cts[i].tv_sec = ts[i].tv_sec;
230 cts[i].tv_nsec = ts[i].tv_nsec;
231 }
232 data = &cts;
233 len = sizeof(cts[0]) * count;
234 }
235 }
236
237 cmlen = CMSG_COMPAT_LEN(len);
238 if (kmsg->msg_controllen < cmlen) {
239 kmsg->msg_flags |= MSG_CTRUNC;
240 cmlen = kmsg->msg_controllen;
241 }
242 cmhdr.cmsg_level = level;
243 cmhdr.cmsg_type = type;
244 cmhdr.cmsg_len = cmlen;
245
246 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
247 return -EFAULT;
248 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
249 return -EFAULT;
250 cmlen = CMSG_COMPAT_SPACE(len);
251 if (kmsg->msg_controllen < cmlen)
252 cmlen = kmsg->msg_controllen;
253 kmsg->msg_control += cmlen;
254 kmsg->msg_controllen -= cmlen;
255 return 0;
256}
257
258void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
259{
260 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
261 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
262 int fdnum = scm->fp->count;
263 struct file **fp = scm->fp->fp;
264 int __user *cmfptr;
265 int err = 0, i;
266
267 if (fdnum < fdmax)
268 fdmax = fdnum;
269
270 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
271 int new_fd;
272 err = security_file_receive(fp[i]);
273 if (err)
274 break;
275 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
276 ? O_CLOEXEC : 0);
277 if (err < 0)
278 break;
279 new_fd = err;
280 err = put_user(new_fd, cmfptr);
281 if (err) {
282 put_unused_fd(new_fd);
283 break;
284 }
285 /* Bump the usage count and install the file. */
286 fd_install(new_fd, get_file(fp[i]));
287 }
288
289 if (i > 0) {
290 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
291 err = put_user(SOL_SOCKET, &cm->cmsg_level);
292 if (!err)
293 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
294 if (!err)
295 err = put_user(cmlen, &cm->cmsg_len);
296 if (!err) {
297 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
298 kmsg->msg_control += cmlen;
299 kmsg->msg_controllen -= cmlen;
300 }
301 }
302 if (i < fdnum)
303 kmsg->msg_flags |= MSG_CTRUNC;
304
305 /*
306 * All of the files that fit in the message have had their
307 * usage counts incremented, so we just free the list.
308 */
309 __scm_destroy(scm);
310}
311
312static int do_set_attach_filter(struct socket *sock, int level, int optname,
313 char __user *optval, unsigned int optlen)
314{
315 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
316 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
317 compat_uptr_t ptr;
318 u16 len;
319
320 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
321 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
322 __get_user(len, &fprog32->len) ||
323 __get_user(ptr, &fprog32->filter) ||
324 __put_user(len, &kfprog->len) ||
325 __put_user(compat_ptr(ptr), &kfprog->filter))
326 return -EFAULT;
327
328 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
329 sizeof(struct sock_fprog));
330}
331
332static int do_set_sock_timeout(struct socket *sock, int level,
333 int optname, char __user *optval, unsigned int optlen)
334{
335 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
336 struct timeval ktime;
337 mm_segment_t old_fs;
338 int err;
339
340 if (optlen < sizeof(*up))
341 return -EINVAL;
342 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
343 __get_user(ktime.tv_sec, &up->tv_sec) ||
344 __get_user(ktime.tv_usec, &up->tv_usec))
345 return -EFAULT;
346 old_fs = get_fs();
347 set_fs(KERNEL_DS);
348 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
349 set_fs(old_fs);
350
351 return err;
352}
353
354static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
355 char __user *optval, unsigned int optlen)
356{
357 if (optname == SO_ATTACH_FILTER)
358 return do_set_attach_filter(sock, level, optname,
359 optval, optlen);
360 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
361 return do_set_sock_timeout(sock, level, optname, optval, optlen);
362
363 return sock_setsockopt(sock, level, optname, optval, optlen);
364}
365
366COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
367 char __user *, optval, unsigned int, optlen)
368{
369 int err;
370 struct socket *sock = sockfd_lookup(fd, &err);
371
372 if (sock) {
373 err = security_socket_setsockopt(sock, level, optname);
374 if (err) {
375 sockfd_put(sock);
376 return err;
377 }
378
379 if (level == SOL_SOCKET)
380 err = compat_sock_setsockopt(sock, level,
381 optname, optval, optlen);
382 else if (sock->ops->compat_setsockopt)
383 err = sock->ops->compat_setsockopt(sock, level,
384 optname, optval, optlen);
385 else
386 err = sock->ops->setsockopt(sock, level,
387 optname, optval, optlen);
388 sockfd_put(sock);
389 }
390 return err;
391}
392
393static int do_get_sock_timeout(struct socket *sock, int level, int optname,
394 char __user *optval, int __user *optlen)
395{
396 struct compat_timeval __user *up;
397 struct timeval ktime;
398 mm_segment_t old_fs;
399 int len, err;
400
401 up = (struct compat_timeval __user *) optval;
402 if (get_user(len, optlen))
403 return -EFAULT;
404 if (len < sizeof(*up))
405 return -EINVAL;
406 len = sizeof(ktime);
407 old_fs = get_fs();
408 set_fs(KERNEL_DS);
409 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
410 set_fs(old_fs);
411
412 if (!err) {
413 if (put_user(sizeof(*up), optlen) ||
414 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
415 __put_user(ktime.tv_sec, &up->tv_sec) ||
416 __put_user(ktime.tv_usec, &up->tv_usec))
417 err = -EFAULT;
418 }
419 return err;
420}
421
422static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
423 char __user *optval, int __user *optlen)
424{
425 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
426 return do_get_sock_timeout(sock, level, optname, optval, optlen);
427 return sock_getsockopt(sock, level, optname, optval, optlen);
428}
429
430int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
431{
432 struct compat_timeval __user *ctv;
433 int err;
434 struct timeval tv;
435
436 if (COMPAT_USE_64BIT_TIME)
437 return sock_get_timestamp(sk, userstamp);
438
439 ctv = (struct compat_timeval __user *) userstamp;
440 err = -ENOENT;
441 if (!sock_flag(sk, SOCK_TIMESTAMP))
442 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
443 tv = ktime_to_timeval(sk->sk_stamp);
444 if (tv.tv_sec == -1)
445 return err;
446 if (tv.tv_sec == 0) {
447 sk->sk_stamp = ktime_get_real();
448 tv = ktime_to_timeval(sk->sk_stamp);
449 }
450 err = 0;
451 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
452 put_user(tv.tv_usec, &ctv->tv_usec))
453 err = -EFAULT;
454 return err;
455}
456EXPORT_SYMBOL(compat_sock_get_timestamp);
457
458int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
459{
460 struct compat_timespec __user *ctv;
461 int err;
462 struct timespec ts;
463
464 if (COMPAT_USE_64BIT_TIME)
465 return sock_get_timestampns (sk, userstamp);
466
467 ctv = (struct compat_timespec __user *) userstamp;
468 err = -ENOENT;
469 if (!sock_flag(sk, SOCK_TIMESTAMP))
470 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
471 ts = ktime_to_timespec(sk->sk_stamp);
472 if (ts.tv_sec == -1)
473 return err;
474 if (ts.tv_sec == 0) {
475 sk->sk_stamp = ktime_get_real();
476 ts = ktime_to_timespec(sk->sk_stamp);
477 }
478 err = 0;
479 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
480 put_user(ts.tv_nsec, &ctv->tv_nsec))
481 err = -EFAULT;
482 return err;
483}
484EXPORT_SYMBOL(compat_sock_get_timestampns);
485
486COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
487 char __user *, optval, int __user *, optlen)
488{
489 int err;
490 struct socket *sock = sockfd_lookup(fd, &err);
491
492 if (sock) {
493 err = security_socket_getsockopt(sock, level, optname);
494 if (err) {
495 sockfd_put(sock);
496 return err;
497 }
498
499 if (level == SOL_SOCKET)
500 err = compat_sock_getsockopt(sock, level,
501 optname, optval, optlen);
502 else if (sock->ops->compat_getsockopt)
503 err = sock->ops->compat_getsockopt(sock, level,
504 optname, optval, optlen);
505 else
506 err = sock->ops->getsockopt(sock, level,
507 optname, optval, optlen);
508 sockfd_put(sock);
509 }
510 return err;
511}
512
513struct compat_group_req {
514 __u32 gr_interface;
515 struct __kernel_sockaddr_storage gr_group
516 __aligned(4);
517} __packed;
518
519struct compat_group_source_req {
520 __u32 gsr_interface;
521 struct __kernel_sockaddr_storage gsr_group
522 __aligned(4);
523 struct __kernel_sockaddr_storage gsr_source
524 __aligned(4);
525} __packed;
526
527struct compat_group_filter {
528 __u32 gf_interface;
529 struct __kernel_sockaddr_storage gf_group
530 __aligned(4);
531 __u32 gf_fmode;
532 __u32 gf_numsrc;
533 struct __kernel_sockaddr_storage gf_slist[1]
534 __aligned(4);
535} __packed;
536
537#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
538 sizeof(struct __kernel_sockaddr_storage))
539
540
541int compat_mc_setsockopt(struct sock *sock, int level, int optname,
542 char __user *optval, unsigned int optlen,
543 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
544{
545 char __user *koptval = optval;
546 int koptlen = optlen;
547
548 switch (optname) {
549 case MCAST_JOIN_GROUP:
550 case MCAST_LEAVE_GROUP:
551 {
552 struct compat_group_req __user *gr32 = (void *)optval;
553 struct group_req __user *kgr =
554 compat_alloc_user_space(sizeof(struct group_req));
555 u32 interface;
556
557 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
558 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
559 __get_user(interface, &gr32->gr_interface) ||
560 __put_user(interface, &kgr->gr_interface) ||
561 copy_in_user(&kgr->gr_group, &gr32->gr_group,
562 sizeof(kgr->gr_group)))
563 return -EFAULT;
564 koptval = (char __user *)kgr;
565 koptlen = sizeof(struct group_req);
566 break;
567 }
568 case MCAST_JOIN_SOURCE_GROUP:
569 case MCAST_LEAVE_SOURCE_GROUP:
570 case MCAST_BLOCK_SOURCE:
571 case MCAST_UNBLOCK_SOURCE:
572 {
573 struct compat_group_source_req __user *gsr32 = (void *)optval;
574 struct group_source_req __user *kgsr = compat_alloc_user_space(
575 sizeof(struct group_source_req));
576 u32 interface;
577
578 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
579 !access_ok(VERIFY_WRITE, kgsr,
580 sizeof(struct group_source_req)) ||
581 __get_user(interface, &gsr32->gsr_interface) ||
582 __put_user(interface, &kgsr->gsr_interface) ||
583 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
584 sizeof(kgsr->gsr_group)) ||
585 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
586 sizeof(kgsr->gsr_source)))
587 return -EFAULT;
588 koptval = (char __user *)kgsr;
589 koptlen = sizeof(struct group_source_req);
590 break;
591 }
592 case MCAST_MSFILTER:
593 {
594 struct compat_group_filter __user *gf32 = (void *)optval;
595 struct group_filter __user *kgf;
596 u32 interface, fmode, numsrc;
597
598 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
599 __get_user(interface, &gf32->gf_interface) ||
600 __get_user(fmode, &gf32->gf_fmode) ||
601 __get_user(numsrc, &gf32->gf_numsrc))
602 return -EFAULT;
603 koptlen = optlen + sizeof(struct group_filter) -
604 sizeof(struct compat_group_filter);
605 if (koptlen < GROUP_FILTER_SIZE(numsrc))
606 return -EINVAL;
607 kgf = compat_alloc_user_space(koptlen);
608 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
609 __put_user(interface, &kgf->gf_interface) ||
610 __put_user(fmode, &kgf->gf_fmode) ||
611 __put_user(numsrc, &kgf->gf_numsrc) ||
612 copy_in_user(&kgf->gf_group, &gf32->gf_group,
613 sizeof(kgf->gf_group)) ||
614 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
615 numsrc * sizeof(kgf->gf_slist[0]))))
616 return -EFAULT;
617 koptval = (char __user *)kgf;
618 break;
619 }
620
621 default:
622 break;
623 }
624 return setsockopt(sock, level, optname, koptval, koptlen);
625}
626EXPORT_SYMBOL(compat_mc_setsockopt);
627
628int compat_mc_getsockopt(struct sock *sock, int level, int optname,
629 char __user *optval, int __user *optlen,
630 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
631{
632 struct compat_group_filter __user *gf32 = (void *)optval;
633 struct group_filter __user *kgf;
634 int __user *koptlen;
635 u32 interface, fmode, numsrc;
636 int klen, ulen, err;
637
638 if (optname != MCAST_MSFILTER)
639 return getsockopt(sock, level, optname, optval, optlen);
640
641 koptlen = compat_alloc_user_space(sizeof(*koptlen));
642 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
643 __get_user(ulen, optlen))
644 return -EFAULT;
645
646 /* adjust len for pad */
647 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
648
649 if (klen < GROUP_FILTER_SIZE(0))
650 return -EINVAL;
651
652 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
653 __put_user(klen, koptlen))
654 return -EFAULT;
655
656 /* have to allow space for previous compat_alloc_user_space, too */
657 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
658
659 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
660 __get_user(interface, &gf32->gf_interface) ||
661 __get_user(fmode, &gf32->gf_fmode) ||
662 __get_user(numsrc, &gf32->gf_numsrc) ||
663 __put_user(interface, &kgf->gf_interface) ||
664 __put_user(fmode, &kgf->gf_fmode) ||
665 __put_user(numsrc, &kgf->gf_numsrc) ||
666 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
667 return -EFAULT;
668
669 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
670 if (err)
671 return err;
672
673 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
674 __get_user(klen, koptlen))
675 return -EFAULT;
676
677 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
678
679 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
680 __put_user(ulen, optlen))
681 return -EFAULT;
682
683 if (!access_ok(VERIFY_READ, kgf, klen) ||
684 !access_ok(VERIFY_WRITE, gf32, ulen) ||
685 __get_user(interface, &kgf->gf_interface) ||
686 __get_user(fmode, &kgf->gf_fmode) ||
687 __get_user(numsrc, &kgf->gf_numsrc) ||
688 __put_user(interface, &gf32->gf_interface) ||
689 __put_user(fmode, &gf32->gf_fmode) ||
690 __put_user(numsrc, &gf32->gf_numsrc))
691 return -EFAULT;
692 if (numsrc) {
693 int copylen;
694
695 klen -= GROUP_FILTER_SIZE(0);
696 copylen = numsrc * sizeof(gf32->gf_slist[0]);
697 if (copylen > klen)
698 copylen = klen;
699 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
700 return -EFAULT;
701 }
702 return err;
703}
704EXPORT_SYMBOL(compat_mc_getsockopt);
705
706
707/* Argument list sizes for compat_sys_socketcall */
708#define AL(x) ((x) * sizeof(u32))
709static unsigned char nas[21] = {
710 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
711 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
712 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
713 AL(4), AL(5), AL(4)
714};
715#undef AL
716
717COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
718{
719 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
720}
721
722COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
723 unsigned int, vlen, unsigned int, flags)
724{
725 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
726 flags | MSG_CMSG_COMPAT);
727}
728
729COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
730{
731 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
732}
733
734COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
735{
736 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
737}
738
739COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
740 unsigned int, flags, struct sockaddr __user *, addr,
741 int __user *, addrlen)
742{
743 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
744}
745
746COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
747 unsigned int, vlen, unsigned int, flags,
748 struct compat_timespec __user *, timeout)
749{
750 int datagrams;
751 struct timespec ktspec;
752
753 if (timeout == NULL)
754 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
755 flags | MSG_CMSG_COMPAT, NULL);
756
757 if (compat_get_timespec(&ktspec, timeout))
758 return -EFAULT;
759
760 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
761 flags | MSG_CMSG_COMPAT, &ktspec);
762 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
763 datagrams = -EFAULT;
764
765 return datagrams;
766}
767
768COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
769{
770 int ret;
771 u32 a[6];
772 u32 a0, a1;
773
774 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
775 return -EINVAL;
776 if (copy_from_user(a, args, nas[call]))
777 return -EFAULT;
778 a0 = a[0];
779 a1 = a[1];
780
781 switch (call) {
782 case SYS_SOCKET:
783 ret = sys_socket(a0, a1, a[2]);
784 break;
785 case SYS_BIND:
786 ret = sys_bind(a0, compat_ptr(a1), a[2]);
787 break;
788 case SYS_CONNECT:
789 ret = sys_connect(a0, compat_ptr(a1), a[2]);
790 break;
791 case SYS_LISTEN:
792 ret = sys_listen(a0, a1);
793 break;
794 case SYS_ACCEPT:
795 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
796 break;
797 case SYS_GETSOCKNAME:
798 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
799 break;
800 case SYS_GETPEERNAME:
801 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
802 break;
803 case SYS_SOCKETPAIR:
804 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
805 break;
806 case SYS_SEND:
807 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
808 break;
809 case SYS_SENDTO:
810 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
811 break;
812 case SYS_RECV:
813 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
814 break;
815 case SYS_RECVFROM:
816 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
817 compat_ptr(a[4]), compat_ptr(a[5]));
818 break;
819 case SYS_SHUTDOWN:
820 ret = sys_shutdown(a0, a1);
821 break;
822 case SYS_SETSOCKOPT:
823 ret = compat_sys_setsockopt(a0, a1, a[2],
824 compat_ptr(a[3]), a[4]);
825 break;
826 case SYS_GETSOCKOPT:
827 ret = compat_sys_getsockopt(a0, a1, a[2],
828 compat_ptr(a[3]), compat_ptr(a[4]));
829 break;
830 case SYS_SENDMSG:
831 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
832 break;
833 case SYS_SENDMMSG:
834 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
835 break;
836 case SYS_RECVMSG:
837 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
838 break;
839 case SYS_RECVMMSG:
840 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
841 compat_ptr(a[4]));
842 break;
843 case SYS_ACCEPT4:
844 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
845 break;
846 default:
847 ret = -EINVAL;
848 break;
849 }
850 return ret;
851}