Line data Source code
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 :
36 0 : int __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 0 : struct compat_msghdr msg;
42 0 : ssize_t err;
43 :
44 0 : if (copy_from_user(&msg, umsg, sizeof(*umsg)))
45 : return -EFAULT;
46 :
47 0 : kmsg->msg_flags = msg.msg_flags;
48 0 : kmsg->msg_namelen = msg.msg_namelen;
49 :
50 0 : if (!msg.msg_name)
51 0 : kmsg->msg_namelen = 0;
52 :
53 0 : if (kmsg->msg_namelen < 0)
54 : return -EINVAL;
55 :
56 0 : if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
57 0 : kmsg->msg_namelen = sizeof(struct sockaddr_storage);
58 :
59 0 : kmsg->msg_control_is_user = true;
60 0 : kmsg->msg_control_user = compat_ptr(msg.msg_control);
61 0 : kmsg->msg_controllen = msg.msg_controllen;
62 :
63 0 : if (save_addr)
64 0 : *save_addr = compat_ptr(msg.msg_name);
65 :
66 0 : if (msg.msg_name && kmsg->msg_namelen) {
67 0 : if (!save_addr) {
68 0 : err = move_addr_to_kernel(compat_ptr(msg.msg_name),
69 : kmsg->msg_namelen,
70 0 : kmsg->msg_name);
71 0 : if (err < 0)
72 : return err;
73 : }
74 : } else {
75 0 : kmsg->msg_name = NULL;
76 0 : kmsg->msg_namelen = 0;
77 : }
78 :
79 0 : if (msg.msg_iovlen > UIO_MAXIOV)
80 : return -EMSGSIZE;
81 :
82 0 : kmsg->msg_iocb = NULL;
83 0 : *ptr = msg.msg_iov;
84 0 : *len = msg.msg_iovlen;
85 0 : return 0;
86 : }
87 :
88 0 : int get_compat_msghdr(struct msghdr *kmsg,
89 : struct compat_msghdr __user *umsg,
90 : struct sockaddr __user **save_addr,
91 : struct iovec **iov)
92 : {
93 0 : compat_uptr_t ptr;
94 0 : compat_size_t len;
95 0 : ssize_t err;
96 :
97 0 : err = __get_compat_msghdr(kmsg, umsg, save_addr, &ptr, &len);
98 0 : if (err)
99 : return err;
100 :
101 0 : err = import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), len,
102 : UIO_FASTIOV, iov, &kmsg->msg_iter);
103 0 : 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 :
127 0 : static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
128 : struct compat_cmsghdr __user *cmsg, int cmsg_len)
129 : {
130 0 : char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
131 0 : if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
132 0 : msg->msg_controllen)
133 0 : 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 : */
141 0 : int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
142 : unsigned char *stackbuf, int stackbuf_size)
143 : {
144 0 : struct compat_cmsghdr __user *ucmsg;
145 0 : struct cmsghdr *kcmsg, *kcmsg_base;
146 0 : compat_size_t ucmlen;
147 0 : __kernel_size_t kcmlen, tmp;
148 0 : int err = -EFAULT;
149 :
150 0 : BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
151 : CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
152 :
153 0 : kcmlen = 0;
154 0 : kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
155 0 : ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
156 0 : while (ucmsg != NULL) {
157 0 : if (get_user(ucmlen, &ucmsg->cmsg_len))
158 : return -EFAULT;
159 :
160 : /* Catch bogons. */
161 0 : if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
162 : return -EINVAL;
163 :
164 0 : tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
165 0 : tmp = CMSG_ALIGN(tmp);
166 0 : kcmlen += tmp;
167 0 : ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
168 : }
169 0 : 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 0 : if (kcmlen > stackbuf_size)
178 0 : kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
179 0 : if (kcmsg == NULL)
180 : return -ENOBUFS;
181 :
182 : /* Now copy them over neatly. */
183 0 : memset(kcmsg, 0, kcmlen);
184 0 : ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
185 0 : while (ucmsg != NULL) {
186 0 : struct compat_cmsghdr cmsg;
187 0 : if (copy_from_user(&cmsg, ucmsg, sizeof(cmsg)))
188 0 : goto Efault;
189 0 : if (!CMSG_COMPAT_OK(cmsg.cmsg_len, ucmsg, kmsg))
190 0 : goto Einval;
191 0 : tmp = ((cmsg.cmsg_len - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
192 0 : if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
193 0 : goto Einval;
194 0 : kcmsg->cmsg_len = tmp;
195 0 : kcmsg->cmsg_level = cmsg.cmsg_level;
196 0 : kcmsg->cmsg_type = cmsg.cmsg_type;
197 0 : tmp = CMSG_ALIGN(tmp);
198 0 : if (copy_from_user(CMSG_DATA(kcmsg),
199 : CMSG_COMPAT_DATA(ucmsg),
200 0 : (cmsg.cmsg_len - sizeof(*ucmsg))))
201 0 : goto Efault;
202 :
203 : /* Advance. */
204 0 : kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
205 0 : 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 0 : if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
213 0 : goto Einval;
214 :
215 : /* Ok, looks like we made it. Hook it up and return success. */
216 0 : kmsg->msg_control = kcmsg_base;
217 0 : kmsg->msg_controllen = kcmlen;
218 0 : return 0;
219 :
220 : Einval:
221 : err = -EINVAL;
222 0 : Efault:
223 0 : if (kcmsg_base != (struct cmsghdr *)stackbuf)
224 0 : sock_kfree_s(sk, kcmsg_base, kcmlen);
225 : return err;
226 : }
227 :
228 0 : int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
229 : {
230 0 : struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
231 0 : struct compat_cmsghdr cmhdr;
232 0 : struct old_timeval32 ctv;
233 0 : struct old_timespec32 cts[3];
234 0 : int cmlen;
235 :
236 0 : if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
237 0 : kmsg->msg_flags |= MSG_CTRUNC;
238 0 : return 0; /* XXX: return error? check spec. */
239 : }
240 :
241 0 : if (!COMPAT_USE_64BIT_TIME) {
242 0 : if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) {
243 0 : struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data;
244 0 : ctv.tv_sec = tv->tv_sec;
245 0 : ctv.tv_usec = tv->tv_usec;
246 0 : data = &ctv;
247 0 : len = sizeof(ctv);
248 : }
249 0 : if (level == SOL_SOCKET &&
250 0 : (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) {
251 0 : int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3;
252 0 : int i;
253 0 : struct __kernel_old_timespec *ts = data;
254 0 : for (i = 0; i < count; i++) {
255 0 : cts[i].tv_sec = ts[i].tv_sec;
256 0 : cts[i].tv_nsec = ts[i].tv_nsec;
257 : }
258 0 : data = &cts;
259 0 : len = sizeof(cts[0]) * count;
260 : }
261 : }
262 :
263 0 : cmlen = CMSG_COMPAT_LEN(len);
264 0 : if (kmsg->msg_controllen < cmlen) {
265 0 : kmsg->msg_flags |= MSG_CTRUNC;
266 0 : cmlen = kmsg->msg_controllen;
267 : }
268 0 : cmhdr.cmsg_level = level;
269 0 : cmhdr.cmsg_type = type;
270 0 : cmhdr.cmsg_len = cmlen;
271 :
272 0 : if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
273 : return -EFAULT;
274 0 : if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
275 : return -EFAULT;
276 0 : cmlen = CMSG_COMPAT_SPACE(len);
277 0 : if (kmsg->msg_controllen < cmlen)
278 0 : cmlen = kmsg->msg_controllen;
279 0 : kmsg->msg_control += cmlen;
280 0 : kmsg->msg_controllen -= cmlen;
281 0 : return 0;
282 : }
283 :
284 0 : static int scm_max_fds_compat(struct msghdr *msg)
285 : {
286 0 : if (msg->msg_controllen <= sizeof(struct compat_cmsghdr))
287 : return 0;
288 0 : return (msg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
289 : }
290 :
291 0 : void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
292 : {
293 0 : struct compat_cmsghdr __user *cm =
294 : (struct compat_cmsghdr __user *)msg->msg_control;
295 0 : unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
296 0 : int fdmax = min_t(int, scm_max_fds_compat(msg), scm->fp->count);
297 0 : int __user *cmsg_data = CMSG_COMPAT_DATA(cm);
298 0 : int err = 0, i;
299 :
300 0 : for (i = 0; i < fdmax; i++) {
301 0 : err = receive_fd_user(scm->fp->fp[i], cmsg_data + i, o_flags);
302 0 : if (err < 0)
303 : break;
304 : }
305 :
306 0 : if (i > 0) {
307 0 : int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
308 :
309 0 : err = put_user(SOL_SOCKET, &cm->cmsg_level);
310 0 : if (!err)
311 0 : err = put_user(SCM_RIGHTS, &cm->cmsg_type);
312 0 : if (!err)
313 0 : err = put_user(cmlen, &cm->cmsg_len);
314 0 : if (!err) {
315 0 : cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
316 0 : if (msg->msg_controllen < cmlen)
317 0 : cmlen = msg->msg_controllen;
318 0 : msg->msg_control += cmlen;
319 0 : msg->msg_controllen -= cmlen;
320 : }
321 : }
322 :
323 0 : if (i < scm->fp->count || (scm->fp->count && fdmax <= 0))
324 0 : 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 0 : __scm_destroy(scm);
331 0 : }
332 :
333 : /* Argument list sizes for compat_sys_socketcall */
334 : #define AL(x) ((x) * sizeof(u32))
335 : static 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 :
343 0 : static inline long __compat_sys_sendmsg(int fd,
344 : struct compat_msghdr __user *msg,
345 : unsigned int flags)
346 : {
347 0 : return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
348 : flags | MSG_CMSG_COMPAT, false);
349 : }
350 :
351 0 : COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
352 : unsigned int, flags)
353 : {
354 0 : return __compat_sys_sendmsg(fd, msg, flags);
355 : }
356 :
357 0 : static inline long __compat_sys_sendmmsg(int fd,
358 : struct compat_mmsghdr __user *mmsg,
359 : unsigned int vlen, unsigned int flags)
360 : {
361 0 : return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
362 : flags | MSG_CMSG_COMPAT, false);
363 : }
364 :
365 0 : COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
366 : unsigned int, vlen, unsigned int, flags)
367 : {
368 0 : return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
369 : }
370 :
371 0 : static inline long __compat_sys_recvmsg(int fd,
372 : struct compat_msghdr __user *msg,
373 : unsigned int flags)
374 : {
375 0 : return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
376 : flags | MSG_CMSG_COMPAT, false);
377 : }
378 :
379 0 : COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
380 : unsigned int, flags)
381 : {
382 0 : return __compat_sys_recvmsg(fd, msg, flags);
383 : }
384 :
385 0 : static 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 0 : return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
391 : addrlen);
392 : }
393 :
394 0 : COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
395 : {
396 0 : return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
397 : }
398 :
399 0 : COMPAT_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 0 : return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
404 : }
405 :
406 0 : COMPAT_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 0 : return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
411 : flags | MSG_CMSG_COMPAT, timeout, NULL);
412 : }
413 :
414 : #ifdef CONFIG_COMPAT_32BIT_TIME
415 : COMPAT_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 :
424 0 : COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
425 : {
426 0 : u32 a[AUDITSC_ARGS];
427 0 : unsigned int len;
428 0 : u32 a0, a1;
429 0 : int ret;
430 :
431 0 : if (call < SYS_SOCKET || call > SYS_SENDMMSG)
432 : return -EINVAL;
433 0 : len = nas[call];
434 0 : if (len > sizeof(a))
435 : return -EINVAL;
436 :
437 0 : if (copy_from_user(a, args, len))
438 : return -EFAULT;
439 :
440 0 : ret = audit_socketcall_compat(len / sizeof(a[0]), a);
441 0 : if (ret)
442 : return ret;
443 :
444 0 : a0 = a[0];
445 0 : a1 = a[1];
446 :
447 0 : switch (call) {
448 0 : case SYS_SOCKET:
449 0 : ret = __sys_socket(a0, a1, a[2]);
450 0 : break;
451 0 : case SYS_BIND:
452 0 : ret = __sys_bind(a0, compat_ptr(a1), a[2]);
453 0 : break;
454 0 : case SYS_CONNECT:
455 0 : ret = __sys_connect(a0, compat_ptr(a1), a[2]);
456 0 : break;
457 0 : case SYS_LISTEN:
458 0 : ret = __sys_listen(a0, a1);
459 0 : break;
460 0 : case SYS_ACCEPT:
461 0 : ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
462 0 : break;
463 0 : case SYS_GETSOCKNAME:
464 0 : ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
465 0 : break;
466 0 : case SYS_GETPEERNAME:
467 0 : ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
468 0 : break;
469 0 : case SYS_SOCKETPAIR:
470 0 : ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
471 0 : break;
472 0 : case SYS_SEND:
473 0 : ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
474 0 : break;
475 0 : case SYS_SENDTO:
476 0 : ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
477 0 : compat_ptr(a[4]), a[5]);
478 0 : break;
479 0 : case SYS_RECV:
480 0 : ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
481 : NULL, NULL);
482 0 : break;
483 0 : case SYS_RECVFROM:
484 0 : ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
485 0 : compat_ptr(a[4]),
486 0 : compat_ptr(a[5]));
487 0 : break;
488 0 : case SYS_SHUTDOWN:
489 0 : ret = __sys_shutdown(a0, a1);
490 0 : break;
491 0 : case SYS_SETSOCKOPT:
492 0 : ret = __sys_setsockopt(a0, a1, a[2], compat_ptr(a[3]), a[4]);
493 0 : break;
494 0 : case SYS_GETSOCKOPT:
495 0 : ret = __sys_getsockopt(a0, a1, a[2], compat_ptr(a[3]),
496 0 : compat_ptr(a[4]));
497 0 : break;
498 0 : case SYS_SENDMSG:
499 0 : ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
500 0 : break;
501 0 : case SYS_SENDMMSG:
502 0 : ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
503 0 : break;
504 0 : case SYS_RECVMSG:
505 0 : ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
506 0 : break;
507 0 : case SYS_RECVMMSG:
508 0 : ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2],
509 0 : a[3] | MSG_CMSG_COMPAT, NULL,
510 0 : compat_ptr(a[4]));
511 0 : break;
512 0 : case SYS_ACCEPT4:
513 0 : ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
514 0 : break;
515 : default:
516 : ret = -EINVAL;
517 : break;
518 : }
519 0 : return ret;
520 : }
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