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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 __user *umsg,
38 struct sockaddr __user **save_addr,
39 compat_uptr_t *ptr, compat_size_t *len)
40{
41 struct compat_msghdr msg;
42 ssize_t err;
43
44 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
45 return -EFAULT;
46
47 kmsg->msg_flags = msg.msg_flags;
48 kmsg->msg_namelen = msg.msg_namelen;
49
50 if (!msg.msg_name)
51 kmsg->msg_namelen = 0;
52
53 if (kmsg->msg_namelen < 0)
54 return -EINVAL;
55
56 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
57 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
58
59 kmsg->msg_control_is_user = true;
60 kmsg->msg_control_user = compat_ptr(msg.msg_control);
61 kmsg->msg_controllen = msg.msg_controllen;
62
63 if (save_addr)
64 *save_addr = compat_ptr(msg.msg_name);
65
66 if (msg.msg_name && kmsg->msg_namelen) {
67 if (!save_addr) {
68 err = move_addr_to_kernel(compat_ptr(msg.msg_name),
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 (msg.msg_iovlen > UIO_MAXIOV)
80 return -EMSGSIZE;
81
82 kmsg->msg_iocb = NULL;
83 *ptr = msg.msg_iov;
84 *len = msg.msg_iovlen;
85 return 0;
86}
87
88int get_compat_msghdr(struct msghdr *kmsg,
89 struct compat_msghdr __user *umsg,
90 struct sockaddr __user **save_addr,
91 struct iovec **iov)
92{
93 compat_uptr_t ptr;
94 compat_size_t len;
95 ssize_t err;
96
97 err = __get_compat_msghdr(kmsg, umsg, save_addr, &ptr, &len);
98 if (err)
99 return err;
100
101 err = import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), len,
102 UIO_FASTIOV, iov, &kmsg->msg_iter);
103 return err < 0 ? err : 0;
104}
105
106/* Bleech... */
107#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
108
109#define CMSG_COMPAT_DATA(cmsg) \
110 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
111#define CMSG_COMPAT_SPACE(len) \
112 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
113#define CMSG_COMPAT_LEN(len) \
114 (sizeof(struct compat_cmsghdr) + (len))
115
116#define CMSG_COMPAT_FIRSTHDR(msg) \
117 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
118 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
119 (struct compat_cmsghdr __user *)NULL)
120
121#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
122 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
123 (ucmlen) <= (unsigned long) \
124 ((mhdr)->msg_controllen - \
125 ((char __user *)(ucmsg) - (char __user *)(mhdr)->msg_control_user)))
126
127static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
128 struct compat_cmsghdr __user *cmsg, int cmsg_len)
129{
130 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
131 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
132 msg->msg_controllen)
133 return NULL;
134 return (struct compat_cmsghdr __user *)ptr;
135}
136
137/* There is a lot of hair here because the alignment rules (and
138 * thus placement) of cmsg headers and length are different for
139 * 32-bit apps. -DaveM
140 */
141int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
142 unsigned char *stackbuf, int stackbuf_size)
143{
144 struct compat_cmsghdr __user *ucmsg;
145 struct cmsghdr *kcmsg, *kcmsg_base;
146 compat_size_t ucmlen;
147 __kernel_size_t kcmlen, tmp;
148 int err = -EFAULT;
149
150 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
151 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
152
153 kcmlen = 0;
154 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
155 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
156 while (ucmsg != NULL) {
157 if (get_user(ucmlen, &ucmsg->cmsg_len))
158 return -EFAULT;
159
160 /* Catch bogons. */
161 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
162 return -EINVAL;
163
164 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
165 tmp = CMSG_ALIGN(tmp);
166 kcmlen += tmp;
167 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
168 }
169 if (kcmlen == 0)
170 return -EINVAL;
171
172 /* The kcmlen holds the 64-bit version of the control length.
173 * It may not be modified as we do not stick it into the kmsg
174 * until we have successfully copied over all of the data
175 * from the user.
176 */
177 if (kcmlen > stackbuf_size)
178 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
179 if (kcmsg == NULL)
180 return -ENOMEM;
181
182 /* Now copy them over neatly. */
183 memset(kcmsg, 0, kcmlen);
184 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
185 while (ucmsg != NULL) {
186 struct compat_cmsghdr cmsg;
187 if (copy_from_user(&cmsg, ucmsg, sizeof(cmsg)))
188 goto Efault;
189 if (!CMSG_COMPAT_OK(cmsg.cmsg_len, ucmsg, kmsg))
190 goto Einval;
191 tmp = ((cmsg.cmsg_len - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
192 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
193 goto Einval;
194 kcmsg->cmsg_len = tmp;
195 kcmsg->cmsg_level = cmsg.cmsg_level;
196 kcmsg->cmsg_type = cmsg.cmsg_type;
197 tmp = CMSG_ALIGN(tmp);
198 if (copy_from_user(CMSG_DATA(kcmsg),
199 CMSG_COMPAT_DATA(ucmsg),
200 (cmsg.cmsg_len - sizeof(*ucmsg))))
201 goto Efault;
202
203 /* Advance. */
204 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
205 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, cmsg.cmsg_len);
206 }
207
208 /*
209 * check the length of messages copied in is the same as the
210 * what we get from the first loop
211 */
212 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
213 goto Einval;
214
215 /* Ok, looks like we made it. Hook it up and return success. */
216 kmsg->msg_control = kcmsg_base;
217 kmsg->msg_controllen = kcmlen;
218 return 0;
219
220Einval:
221 err = -EINVAL;
222Efault:
223 if (kcmsg_base != (struct cmsghdr *)stackbuf)
224 sock_kfree_s(sk, kcmsg_base, kcmlen);
225 return err;
226}
227
228int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
229{
230 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
231 struct compat_cmsghdr cmhdr;
232 struct old_timeval32 ctv;
233 struct old_timespec32 cts[3];
234 int cmlen;
235
236 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
237 kmsg->msg_flags |= MSG_CTRUNC;
238 return 0; /* XXX: return error? check spec. */
239 }
240
241 if (!COMPAT_USE_64BIT_TIME) {
242 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) {
243 struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data;
244 ctv.tv_sec = tv->tv_sec;
245 ctv.tv_usec = tv->tv_usec;
246 data = &ctv;
247 len = sizeof(ctv);
248 }
249 if (level == SOL_SOCKET &&
250 (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) {
251 int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3;
252 int i;
253 struct __kernel_old_timespec *ts = data;
254 for (i = 0; i < count; i++) {
255 cts[i].tv_sec = ts[i].tv_sec;
256 cts[i].tv_nsec = ts[i].tv_nsec;
257 }
258 data = &cts;
259 len = sizeof(cts[0]) * count;
260 }
261 }
262
263 cmlen = CMSG_COMPAT_LEN(len);
264 if (kmsg->msg_controllen < cmlen) {
265 kmsg->msg_flags |= MSG_CTRUNC;
266 cmlen = kmsg->msg_controllen;
267 }
268 cmhdr.cmsg_level = level;
269 cmhdr.cmsg_type = type;
270 cmhdr.cmsg_len = cmlen;
271
272 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
273 return -EFAULT;
274 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
275 return -EFAULT;
276 cmlen = CMSG_COMPAT_SPACE(len);
277 if (kmsg->msg_controllen < cmlen)
278 cmlen = kmsg->msg_controllen;
279 kmsg->msg_control += cmlen;
280 kmsg->msg_controllen -= cmlen;
281 return 0;
282}
283
284static int scm_max_fds_compat(struct msghdr *msg)
285{
286 if (msg->msg_controllen <= sizeof(struct compat_cmsghdr))
287 return 0;
288 return (msg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
289}
290
291void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
292{
293 struct compat_cmsghdr __user *cm =
294 (struct compat_cmsghdr __user *)msg->msg_control;
295 unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
296 int fdmax = min_t(int, scm_max_fds_compat(msg), scm->fp->count);
297 int __user *cmsg_data = CMSG_COMPAT_DATA(cm);
298 int err = 0, i;
299
300 for (i = 0; i < fdmax; i++) {
301 err = receive_fd_user(scm->fp->fp[i], cmsg_data + i, o_flags);
302 if (err < 0)
303 break;
304 }
305
306 if (i > 0) {
307 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
308
309 err = put_user(SOL_SOCKET, &cm->cmsg_level);
310 if (!err)
311 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
312 if (!err)
313 err = put_user(cmlen, &cm->cmsg_len);
314 if (!err) {
315 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
316 if (msg->msg_controllen < cmlen)
317 cmlen = msg->msg_controllen;
318 msg->msg_control += cmlen;
319 msg->msg_controllen -= cmlen;
320 }
321 }
322
323 if (i < scm->fp->count || (scm->fp->count && fdmax <= 0))
324 msg->msg_flags |= MSG_CTRUNC;
325
326 /*
327 * All of the files that fit in the message have had their usage counts
328 * incremented, so we just free the list.
329 */
330 __scm_destroy(scm);
331}
332
333/* Argument list sizes for compat_sys_socketcall */
334#define AL(x) ((x) * sizeof(u32))
335static unsigned char nas[21] = {
336 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
337 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
338 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
339 AL(4), AL(5), AL(4)
340};
341#undef AL
342
343static inline long __compat_sys_sendmsg(int fd,
344 struct compat_msghdr __user *msg,
345 unsigned int flags)
346{
347 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
348 flags | MSG_CMSG_COMPAT, false);
349}
350
351COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
352 unsigned int, flags)
353{
354 return __compat_sys_sendmsg(fd, msg, flags);
355}
356
357static inline long __compat_sys_sendmmsg(int fd,
358 struct compat_mmsghdr __user *mmsg,
359 unsigned int vlen, unsigned int flags)
360{
361 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
362 flags | MSG_CMSG_COMPAT, false);
363}
364
365COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
366 unsigned int, vlen, unsigned int, flags)
367{
368 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
369}
370
371static inline long __compat_sys_recvmsg(int fd,
372 struct compat_msghdr __user *msg,
373 unsigned int flags)
374{
375 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
376 flags | MSG_CMSG_COMPAT, false);
377}
378
379COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
380 unsigned int, flags)
381{
382 return __compat_sys_recvmsg(fd, msg, flags);
383}
384
385static inline long __compat_sys_recvfrom(int fd, void __user *buf,
386 compat_size_t len, unsigned int flags,
387 struct sockaddr __user *addr,
388 int __user *addrlen)
389{
390 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
391 addrlen);
392}
393
394COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
395{
396 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
397}
398
399COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
400 unsigned int, flags, struct sockaddr __user *, addr,
401 int __user *, addrlen)
402{
403 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
404}
405
406COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg,
407 unsigned int, vlen, unsigned int, flags,
408 struct __kernel_timespec __user *, timeout)
409{
410 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
411 flags | MSG_CMSG_COMPAT, timeout, NULL);
412}
413
414#ifdef CONFIG_COMPAT_32BIT_TIME
415COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg,
416 unsigned int, vlen, unsigned int, flags,
417 struct old_timespec32 __user *, timeout)
418{
419 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
420 flags | MSG_CMSG_COMPAT, NULL, timeout);
421}
422#endif
423
424COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
425{
426 u32 a[AUDITSC_ARGS];
427 unsigned int len;
428 u32 a0, a1;
429 int ret;
430
431 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
432 return -EINVAL;
433 len = nas[call];
434 if (len > sizeof(a))
435 return -EINVAL;
436
437 if (copy_from_user(a, args, len))
438 return -EFAULT;
439
440 ret = audit_socketcall_compat(len / sizeof(a[0]), a);
441 if (ret)
442 return ret;
443
444 a0 = a[0];
445 a1 = a[1];
446
447 switch (call) {
448 case SYS_SOCKET:
449 ret = __sys_socket(a0, a1, a[2]);
450 break;
451 case SYS_BIND:
452 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
453 break;
454 case SYS_CONNECT:
455 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
456 break;
457 case SYS_LISTEN:
458 ret = __sys_listen(a0, a1);
459 break;
460 case SYS_ACCEPT:
461 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
462 break;
463 case SYS_GETSOCKNAME:
464 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
465 break;
466 case SYS_GETPEERNAME:
467 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
468 break;
469 case SYS_SOCKETPAIR:
470 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
471 break;
472 case SYS_SEND:
473 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
474 break;
475 case SYS_SENDTO:
476 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
477 compat_ptr(a[4]), a[5]);
478 break;
479 case SYS_RECV:
480 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
481 NULL, NULL);
482 break;
483 case SYS_RECVFROM:
484 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
485 compat_ptr(a[4]),
486 compat_ptr(a[5]));
487 break;
488 case SYS_SHUTDOWN:
489 ret = __sys_shutdown(a0, a1);
490 break;
491 case SYS_SETSOCKOPT:
492 ret = __sys_setsockopt(a0, a1, a[2], compat_ptr(a[3]), a[4]);
493 break;
494 case SYS_GETSOCKOPT:
495 ret = __sys_getsockopt(a0, a1, a[2], compat_ptr(a[3]),
496 compat_ptr(a[4]));
497 break;
498 case SYS_SENDMSG:
499 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
500 break;
501 case SYS_SENDMMSG:
502 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
503 break;
504 case SYS_RECVMSG:
505 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
506 break;
507 case SYS_RECVMMSG:
508 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2],
509 a[3] | MSG_CMSG_COMPAT, NULL,
510 compat_ptr(a[4]));
511 break;
512 case SYS_ACCEPT4:
513 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
514 break;
515 default:
516 ret = -EINVAL;
517 break;
518 }
519 return ret;
520}
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) : \
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) >
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 = kcmsg_base;
215 kmsg->msg_controllen = kcmlen;
216 return 0;
217
218Einval:
219 err = -EINVAL;
220Efault:
221 if (kcmsg_base != (struct cmsghdr *)stackbuf)
222 sock_kfree_s(sk, kcmsg_base, kcmlen);
223 return err;
224}
225
226int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
227{
228 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
229 struct compat_cmsghdr cmhdr;
230 struct old_timeval32 ctv;
231 struct old_timespec32 cts[3];
232 int cmlen;
233
234 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
235 kmsg->msg_flags |= MSG_CTRUNC;
236 return 0; /* XXX: return error? check spec. */
237 }
238
239 if (!COMPAT_USE_64BIT_TIME) {
240 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) {
241 struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data;
242 ctv.tv_sec = tv->tv_sec;
243 ctv.tv_usec = tv->tv_usec;
244 data = &ctv;
245 len = sizeof(ctv);
246 }
247 if (level == SOL_SOCKET &&
248 (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) {
249 int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3;
250 int i;
251 struct __kernel_old_timespec *ts = data;
252 for (i = 0; i < count; i++) {
253 cts[i].tv_sec = ts[i].tv_sec;
254 cts[i].tv_nsec = ts[i].tv_nsec;
255 }
256 data = &cts;
257 len = sizeof(cts[0]) * count;
258 }
259 }
260
261 cmlen = CMSG_COMPAT_LEN(len);
262 if (kmsg->msg_controllen < cmlen) {
263 kmsg->msg_flags |= MSG_CTRUNC;
264 cmlen = kmsg->msg_controllen;
265 }
266 cmhdr.cmsg_level = level;
267 cmhdr.cmsg_type = type;
268 cmhdr.cmsg_len = cmlen;
269
270 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
271 return -EFAULT;
272 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
273 return -EFAULT;
274 cmlen = CMSG_COMPAT_SPACE(len);
275 if (kmsg->msg_controllen < cmlen)
276 cmlen = kmsg->msg_controllen;
277 kmsg->msg_control += cmlen;
278 kmsg->msg_controllen -= cmlen;
279 return 0;
280}
281
282static int scm_max_fds_compat(struct msghdr *msg)
283{
284 if (msg->msg_controllen <= sizeof(struct compat_cmsghdr))
285 return 0;
286 return (msg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
287}
288
289void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
290{
291 struct compat_cmsghdr __user *cm =
292 (struct compat_cmsghdr __user *)msg->msg_control;
293 unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
294 int fdmax = min_t(int, scm_max_fds_compat(msg), scm->fp->count);
295 int __user *cmsg_data = CMSG_COMPAT_DATA(cm);
296 int err = 0, i;
297
298 for (i = 0; i < fdmax; i++) {
299 err = receive_fd_user(scm->fp->fp[i], cmsg_data + i, o_flags);
300 if (err < 0)
301 break;
302 }
303
304 if (i > 0) {
305 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
306
307 err = put_user(SOL_SOCKET, &cm->cmsg_level);
308 if (!err)
309 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
310 if (!err)
311 err = put_user(cmlen, &cm->cmsg_len);
312 if (!err) {
313 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
314 if (msg->msg_controllen < cmlen)
315 cmlen = msg->msg_controllen;
316 msg->msg_control += cmlen;
317 msg->msg_controllen -= cmlen;
318 }
319 }
320
321 if (i < scm->fp->count || (scm->fp->count && fdmax <= 0))
322 msg->msg_flags |= MSG_CTRUNC;
323
324 /*
325 * All of the files that fit in the message have had their usage counts
326 * incremented, so we just free the list.
327 */
328 __scm_destroy(scm);
329}
330
331/* Argument list sizes for compat_sys_socketcall */
332#define AL(x) ((x) * sizeof(u32))
333static unsigned char nas[21] = {
334 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
335 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
336 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
337 AL(4), AL(5), AL(4)
338};
339#undef AL
340
341static inline long __compat_sys_sendmsg(int fd,
342 struct compat_msghdr __user *msg,
343 unsigned int flags)
344{
345 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
346 flags | MSG_CMSG_COMPAT, false);
347}
348
349COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
350 unsigned int, flags)
351{
352 return __compat_sys_sendmsg(fd, msg, flags);
353}
354
355static inline long __compat_sys_sendmmsg(int fd,
356 struct compat_mmsghdr __user *mmsg,
357 unsigned int vlen, unsigned int flags)
358{
359 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
360 flags | MSG_CMSG_COMPAT, false);
361}
362
363COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
364 unsigned int, vlen, unsigned int, flags)
365{
366 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
367}
368
369static inline long __compat_sys_recvmsg(int fd,
370 struct compat_msghdr __user *msg,
371 unsigned int flags)
372{
373 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
374 flags | MSG_CMSG_COMPAT, false);
375}
376
377COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
378 unsigned int, flags)
379{
380 return __compat_sys_recvmsg(fd, msg, flags);
381}
382
383static inline long __compat_sys_recvfrom(int fd, void __user *buf,
384 compat_size_t len, unsigned int flags,
385 struct sockaddr __user *addr,
386 int __user *addrlen)
387{
388 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
389 addrlen);
390}
391
392COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
393{
394 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
395}
396
397COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
398 unsigned int, flags, struct sockaddr __user *, addr,
399 int __user *, addrlen)
400{
401 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
402}
403
404COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg,
405 unsigned int, vlen, unsigned int, flags,
406 struct __kernel_timespec __user *, timeout)
407{
408 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
409 flags | MSG_CMSG_COMPAT, timeout, NULL);
410}
411
412#ifdef CONFIG_COMPAT_32BIT_TIME
413COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg,
414 unsigned int, vlen, unsigned int, flags,
415 struct old_timespec32 __user *, timeout)
416{
417 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
418 flags | MSG_CMSG_COMPAT, NULL, timeout);
419}
420#endif
421
422COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
423{
424 u32 a[AUDITSC_ARGS];
425 unsigned int len;
426 u32 a0, a1;
427 int ret;
428
429 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
430 return -EINVAL;
431 len = nas[call];
432 if (len > sizeof(a))
433 return -EINVAL;
434
435 if (copy_from_user(a, args, len))
436 return -EFAULT;
437
438 ret = audit_socketcall_compat(len / sizeof(a[0]), a);
439 if (ret)
440 return ret;
441
442 a0 = a[0];
443 a1 = a[1];
444
445 switch (call) {
446 case SYS_SOCKET:
447 ret = __sys_socket(a0, a1, a[2]);
448 break;
449 case SYS_BIND:
450 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
451 break;
452 case SYS_CONNECT:
453 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
454 break;
455 case SYS_LISTEN:
456 ret = __sys_listen(a0, a1);
457 break;
458 case SYS_ACCEPT:
459 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
460 break;
461 case SYS_GETSOCKNAME:
462 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
463 break;
464 case SYS_GETPEERNAME:
465 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
466 break;
467 case SYS_SOCKETPAIR:
468 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
469 break;
470 case SYS_SEND:
471 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
472 break;
473 case SYS_SENDTO:
474 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
475 compat_ptr(a[4]), a[5]);
476 break;
477 case SYS_RECV:
478 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
479 NULL, NULL);
480 break;
481 case SYS_RECVFROM:
482 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
483 compat_ptr(a[4]),
484 compat_ptr(a[5]));
485 break;
486 case SYS_SHUTDOWN:
487 ret = __sys_shutdown(a0, a1);
488 break;
489 case SYS_SETSOCKOPT:
490 ret = __sys_setsockopt(a0, a1, a[2], compat_ptr(a[3]), a[4]);
491 break;
492 case SYS_GETSOCKOPT:
493 ret = __sys_getsockopt(a0, a1, a[2], compat_ptr(a[3]),
494 compat_ptr(a[4]));
495 break;
496 case SYS_SENDMSG:
497 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
498 break;
499 case SYS_SENDMMSG:
500 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
501 break;
502 case SYS_RECVMSG:
503 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
504 break;
505 case SYS_RECVMMSG:
506 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2],
507 a[3] | MSG_CMSG_COMPAT, NULL,
508 compat_ptr(a[4]));
509 break;
510 case SYS_ACCEPT4:
511 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
512 break;
513 default:
514 ret = -EINVAL;
515 break;
516 }
517 return ret;
518}