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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/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
35int 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
108static 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 */
122int 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
200Einval:
201 err = -EINVAL;
202Efault:
203 if (kcmsg_base != (struct cmsghdr *)stackbuf)
204 sock_kfree_s(sk, kcmsg_base, kcmlen);
205 return err;
206}
207
208int 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
264void 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. */
319struct 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}
336EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
337
338static 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
351static 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
373static 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
387static 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
414COMPAT_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
420static 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
449static 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
458int 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}
484EXPORT_SYMBOL(compat_sock_get_timestamp);
485
486int 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}
512EXPORT_SYMBOL(compat_sock_get_timestampns);
513
514static 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
542COMPAT_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
548struct compat_group_req {
549 __u32 gr_interface;
550 struct __kernel_sockaddr_storage gr_group
551 __aligned(4);
552} __packed;
553
554struct 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
562struct 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
576int 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}
661EXPORT_SYMBOL(compat_mc_setsockopt);
662
663int 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}
739EXPORT_SYMBOL(compat_mc_getsockopt);
740
741
742/* Argument list sizes for compat_sys_socketcall */
743#define AL(x) ((x) * sizeof(u32))
744static 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
752static 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
760COMPAT_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
766static 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
774COMPAT_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
780static 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
788COMPAT_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
794static 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
803COMPAT_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
808COMPAT_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
815static 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
837COMPAT_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
844COMPAT_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}