• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
get_compat_msghdr(struct msghdr * kmsg,struct compat_msghdr __user * umsg,struct sockaddr __user ** save_addr,struct iovec ** iov)35 int get_compat_msghdr(struct msghdr *kmsg,
36 		      struct compat_msghdr __user *umsg,
37 		      struct sockaddr __user **save_addr,
38 		      struct iovec **iov)
39 {
40 	struct compat_msghdr msg;
41 	ssize_t err;
42 
43 	if (copy_from_user(&msg, umsg, sizeof(*umsg)))
44 		return -EFAULT;
45 
46 	kmsg->msg_flags = msg.msg_flags;
47 	kmsg->msg_namelen = msg.msg_namelen;
48 
49 	if (!msg.msg_name)
50 		kmsg->msg_namelen = 0;
51 
52 	if (kmsg->msg_namelen < 0)
53 		return -EINVAL;
54 
55 	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
56 		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
57 
58 	kmsg->msg_control = compat_ptr(msg.msg_control);
59 	kmsg->msg_controllen = msg.msg_controllen;
60 
61 	if (save_addr)
62 		*save_addr = compat_ptr(msg.msg_name);
63 
64 	if (msg.msg_name && kmsg->msg_namelen) {
65 		if (!save_addr) {
66 			err = move_addr_to_kernel(compat_ptr(msg.msg_name),
67 						  kmsg->msg_namelen,
68 						  kmsg->msg_name);
69 			if (err < 0)
70 				return err;
71 		}
72 	} else {
73 		kmsg->msg_name = NULL;
74 		kmsg->msg_namelen = 0;
75 	}
76 
77 	if (msg.msg_iovlen > UIO_MAXIOV)
78 		return -EMSGSIZE;
79 
80 	kmsg->msg_iocb = NULL;
81 
82 	return compat_import_iovec(save_addr ? READ : WRITE,
83 				   compat_ptr(msg.msg_iov), msg.msg_iovlen,
84 				   UIO_FASTIOV, iov, &kmsg->msg_iter);
85 }
86 
87 /* Bleech... */
88 #define CMSG_COMPAT_ALIGN(len)	ALIGN((len), sizeof(s32))
89 
90 #define CMSG_COMPAT_DATA(cmsg)				\
91 	((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
92 #define CMSG_COMPAT_SPACE(len)				\
93 	(sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
94 #define CMSG_COMPAT_LEN(len)				\
95 	(sizeof(struct compat_cmsghdr) + (len))
96 
97 #define CMSG_COMPAT_FIRSTHDR(msg)			\
98 	(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?	\
99 	 (struct compat_cmsghdr __user *)((msg)->msg_control) :		\
100 	 (struct compat_cmsghdr __user *)NULL)
101 
102 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
103 	((ucmlen) >= sizeof(struct compat_cmsghdr) && \
104 	 (ucmlen) <= (unsigned long) \
105 	 ((mhdr)->msg_controllen - \
106 	  ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
107 
cmsg_compat_nxthdr(struct msghdr * msg,struct compat_cmsghdr __user * cmsg,int cmsg_len)108 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
109 		struct compat_cmsghdr __user *cmsg, int cmsg_len)
110 {
111 	char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
112 	if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
113 			msg->msg_controllen)
114 		return NULL;
115 	return (struct compat_cmsghdr __user *)ptr;
116 }
117 
118 /* There is a lot of hair here because the alignment rules (and
119  * thus placement) of cmsg headers and length are different for
120  * 32-bit apps.  -DaveM
121  */
cmsghdr_from_user_compat_to_kern(struct msghdr * kmsg,struct sock * sk,unsigned char * stackbuf,int stackbuf_size)122 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
123 			       unsigned char *stackbuf, int stackbuf_size)
124 {
125 	struct compat_cmsghdr __user *ucmsg;
126 	struct cmsghdr *kcmsg, *kcmsg_base;
127 	compat_size_t ucmlen;
128 	__kernel_size_t kcmlen, tmp;
129 	int err = -EFAULT;
130 
131 	BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
132 		     CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
133 
134 	kcmlen = 0;
135 	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
136 	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
137 	while (ucmsg != NULL) {
138 		if (get_user(ucmlen, &ucmsg->cmsg_len))
139 			return -EFAULT;
140 
141 		/* Catch bogons. */
142 		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
143 			return -EINVAL;
144 
145 		tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
146 		tmp = CMSG_ALIGN(tmp);
147 		kcmlen += tmp;
148 		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
149 	}
150 	if (kcmlen == 0)
151 		return -EINVAL;
152 
153 	/* The kcmlen holds the 64-bit version of the control length.
154 	 * It may not be modified as we do not stick it into the kmsg
155 	 * until we have successfully copied over all of the data
156 	 * from the user.
157 	 */
158 	if (kcmlen > stackbuf_size)
159 		kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
160 	if (kcmsg == NULL)
161 		return -ENOBUFS;
162 
163 	/* Now copy them over neatly. */
164 	memset(kcmsg, 0, kcmlen);
165 	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
166 	while (ucmsg != NULL) {
167 		if (__get_user(ucmlen, &ucmsg->cmsg_len))
168 			goto Efault;
169 		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
170 			goto Einval;
171 		tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
172 		if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
173 			goto Einval;
174 		kcmsg->cmsg_len = tmp;
175 		tmp = CMSG_ALIGN(tmp);
176 		if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
177 		    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
178 		    copy_from_user(CMSG_DATA(kcmsg),
179 				   CMSG_COMPAT_DATA(ucmsg),
180 				   (ucmlen - sizeof(*ucmsg))))
181 			goto Efault;
182 
183 		/* Advance. */
184 		kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
185 		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
186 	}
187 
188 	/*
189 	 * check the length of messages copied in is the same as the
190 	 * what we get from the first loop
191 	 */
192 	if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
193 		goto Einval;
194 
195 	/* Ok, looks like we made it.  Hook it up and return success. */
196 	kmsg->msg_control = kcmsg_base;
197 	kmsg->msg_controllen = kcmlen;
198 	return 0;
199 
200 Einval:
201 	err = -EINVAL;
202 Efault:
203 	if (kcmsg_base != (struct cmsghdr *)stackbuf)
204 		sock_kfree_s(sk, kcmsg_base, kcmlen);
205 	return err;
206 }
207 
put_cmsg_compat(struct msghdr * kmsg,int level,int type,int len,void * data)208 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
209 {
210 	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
211 	struct compat_cmsghdr cmhdr;
212 	struct compat_timeval ctv;
213 	struct compat_timespec cts[3];
214 	int cmlen;
215 
216 	if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
217 		kmsg->msg_flags |= MSG_CTRUNC;
218 		return 0; /* XXX: return error? check spec. */
219 	}
220 
221 	if (!COMPAT_USE_64BIT_TIME) {
222 		if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
223 			struct timeval *tv = (struct timeval *)data;
224 			ctv.tv_sec = tv->tv_sec;
225 			ctv.tv_usec = tv->tv_usec;
226 			data = &ctv;
227 			len = sizeof(ctv);
228 		}
229 		if (level == SOL_SOCKET &&
230 		    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
231 			int count = type == SCM_TIMESTAMPNS ? 1 : 3;
232 			int i;
233 			struct timespec *ts = (struct timespec *)data;
234 			for (i = 0; i < count; i++) {
235 				cts[i].tv_sec = ts[i].tv_sec;
236 				cts[i].tv_nsec = ts[i].tv_nsec;
237 			}
238 			data = &cts;
239 			len = sizeof(cts[0]) * count;
240 		}
241 	}
242 
243 	cmlen = CMSG_COMPAT_LEN(len);
244 	if (kmsg->msg_controllen < cmlen) {
245 		kmsg->msg_flags |= MSG_CTRUNC;
246 		cmlen = kmsg->msg_controllen;
247 	}
248 	cmhdr.cmsg_level = level;
249 	cmhdr.cmsg_type = type;
250 	cmhdr.cmsg_len = cmlen;
251 
252 	if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
253 		return -EFAULT;
254 	if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
255 		return -EFAULT;
256 	cmlen = CMSG_COMPAT_SPACE(len);
257 	if (kmsg->msg_controllen < cmlen)
258 		cmlen = kmsg->msg_controllen;
259 	kmsg->msg_control += cmlen;
260 	kmsg->msg_controllen -= cmlen;
261 	return 0;
262 }
263 
scm_detach_fds_compat(struct msghdr * kmsg,struct scm_cookie * scm)264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
265 {
266 	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
267 	int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
268 	int fdnum = scm->fp->count;
269 	struct file **fp = scm->fp->fp;
270 	int __user *cmfptr;
271 	int err = 0, i;
272 
273 	if (fdnum < fdmax)
274 		fdmax = fdnum;
275 
276 	for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
277 		int new_fd;
278 		err = security_file_receive(fp[i]);
279 		if (err)
280 			break;
281 		err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
282 					  ? O_CLOEXEC : 0);
283 		if (err < 0)
284 			break;
285 		new_fd = err;
286 		err = put_user(new_fd, cmfptr);
287 		if (err) {
288 			put_unused_fd(new_fd);
289 			break;
290 		}
291 		/* Bump the usage count and install the file. */
292 		fd_install(new_fd, get_file(fp[i]));
293 	}
294 
295 	if (i > 0) {
296 		int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
297 		err = put_user(SOL_SOCKET, &cm->cmsg_level);
298 		if (!err)
299 			err = put_user(SCM_RIGHTS, &cm->cmsg_type);
300 		if (!err)
301 			err = put_user(cmlen, &cm->cmsg_len);
302 		if (!err) {
303 			cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
304 			kmsg->msg_control += cmlen;
305 			kmsg->msg_controllen -= cmlen;
306 		}
307 	}
308 	if (i < fdnum)
309 		kmsg->msg_flags |= MSG_CTRUNC;
310 
311 	/*
312 	 * All of the files that fit in the message have had their
313 	 * usage counts incremented, so we just free the list.
314 	 */
315 	__scm_destroy(scm);
316 }
317 
318 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
get_compat_bpf_fprog(char __user * optval)319 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
320 {
321 	struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
322 	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
323 	struct compat_sock_fprog f32;
324 	struct sock_fprog f;
325 
326 	if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
327 		return NULL;
328 	memset(&f, 0, sizeof(f));
329 	f.len = f32.len;
330 	f.filter = compat_ptr(f32.filter);
331 	if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
332 		return NULL;
333 
334 	return kfprog;
335 }
336 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
337 
do_set_attach_filter(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)338 static int do_set_attach_filter(struct socket *sock, int level, int optname,
339 				char __user *optval, unsigned int optlen)
340 {
341 	struct sock_fprog __user *kfprog;
342 
343 	kfprog = get_compat_bpf_fprog(optval);
344 	if (!kfprog)
345 		return -EFAULT;
346 
347 	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
348 			      sizeof(struct sock_fprog));
349 }
350 
do_set_sock_timeout(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)351 static int do_set_sock_timeout(struct socket *sock, int level,
352 		int optname, char __user *optval, unsigned int optlen)
353 {
354 	struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
355 	struct timeval ktime;
356 	mm_segment_t old_fs;
357 	int err;
358 
359 	if (optlen < sizeof(*up))
360 		return -EINVAL;
361 	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
362 	    __get_user(ktime.tv_sec, &up->tv_sec) ||
363 	    __get_user(ktime.tv_usec, &up->tv_usec))
364 		return -EFAULT;
365 	old_fs = get_fs();
366 	set_fs(KERNEL_DS);
367 	err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
368 	set_fs(old_fs);
369 
370 	return err;
371 }
372 
compat_sock_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)373 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
374 				char __user *optval, unsigned int optlen)
375 {
376 	if (optname == SO_ATTACH_FILTER ||
377 	    optname == SO_ATTACH_REUSEPORT_CBPF)
378 		return do_set_attach_filter(sock, level, optname,
379 					    optval, optlen);
380 	if (!COMPAT_USE_64BIT_TIME &&
381 	    (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
382 		return do_set_sock_timeout(sock, level, optname, optval, optlen);
383 
384 	return sock_setsockopt(sock, level, optname, optval, optlen);
385 }
386 
COMPAT_SYSCALL_DEFINE5(setsockopt,int,fd,int,level,int,optname,char __user *,optval,unsigned int,optlen)387 COMPAT_SYSCALL_DEFINE5(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 
do_get_sock_timeout(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)414 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
415 		char __user *optval, int __user *optlen)
416 {
417 	struct compat_timeval __user *up;
418 	struct timeval ktime;
419 	mm_segment_t old_fs;
420 	int len, err;
421 
422 	up = (struct compat_timeval __user *) optval;
423 	if (get_user(len, optlen))
424 		return -EFAULT;
425 	if (len < sizeof(*up))
426 		return -EINVAL;
427 	len = sizeof(ktime);
428 	old_fs = get_fs();
429 	set_fs(KERNEL_DS);
430 	err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
431 	set_fs(old_fs);
432 
433 	if (!err) {
434 		if (put_user(sizeof(*up), optlen) ||
435 		    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
436 		    __put_user(ktime.tv_sec, &up->tv_sec) ||
437 		    __put_user(ktime.tv_usec, &up->tv_usec))
438 			err = -EFAULT;
439 	}
440 	return err;
441 }
442 
compat_sock_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)443 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
444 				char __user *optval, int __user *optlen)
445 {
446 	if (!COMPAT_USE_64BIT_TIME &&
447 	    (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
448 		return do_get_sock_timeout(sock, level, optname, optval, optlen);
449 	return sock_getsockopt(sock, level, optname, optval, optlen);
450 }
451 
compat_sock_get_timestamp(struct sock * sk,struct timeval __user * userstamp)452 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
453 {
454 	struct compat_timeval __user *ctv;
455 	int err;
456 	struct timeval tv;
457 
458 	if (COMPAT_USE_64BIT_TIME)
459 		return sock_get_timestamp(sk, userstamp);
460 
461 	ctv = (struct compat_timeval __user *) userstamp;
462 	err = -ENOENT;
463 	if (!sock_flag(sk, SOCK_TIMESTAMP))
464 		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
465 	tv = ktime_to_timeval(sock_read_timestamp(sk));
466 
467 	if (tv.tv_sec == -1)
468 		return err;
469 	if (tv.tv_sec == 0) {
470 		ktime_t kt = ktime_get_real();
471 		sock_write_timestamp(sk, kt);
472 		tv = ktime_to_timeval(kt);
473 	}
474 	err = 0;
475 	if (put_user(tv.tv_sec, &ctv->tv_sec) ||
476 			put_user(tv.tv_usec, &ctv->tv_usec))
477 		err = -EFAULT;
478 	return err;
479 }
480 EXPORT_SYMBOL(compat_sock_get_timestamp);
481 
compat_sock_get_timestampns(struct sock * sk,struct timespec __user * userstamp)482 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
483 {
484 	struct compat_timespec __user *ctv;
485 	int err;
486 	struct timespec ts;
487 
488 	if (COMPAT_USE_64BIT_TIME)
489 		return sock_get_timestampns (sk, userstamp);
490 
491 	ctv = (struct compat_timespec __user *) userstamp;
492 	err = -ENOENT;
493 	if (!sock_flag(sk, SOCK_TIMESTAMP))
494 		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
495 	ts = ktime_to_timespec(sock_read_timestamp(sk));
496 	if (ts.tv_sec == -1)
497 		return err;
498 	if (ts.tv_sec == 0) {
499 		ktime_t kt = ktime_get_real();
500 		sock_write_timestamp(sk, kt);
501 		ts = ktime_to_timespec(kt);
502 	}
503 	err = 0;
504 	if (put_user(ts.tv_sec, &ctv->tv_sec) ||
505 			put_user(ts.tv_nsec, &ctv->tv_nsec))
506 		err = -EFAULT;
507 	return err;
508 }
509 EXPORT_SYMBOL(compat_sock_get_timestampns);
510 
COMPAT_SYSCALL_DEFINE5(getsockopt,int,fd,int,level,int,optname,char __user *,optval,int __user *,optlen)511 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
512 		       char __user *, optval, int __user *, optlen)
513 {
514 	int err;
515 	struct socket *sock = sockfd_lookup(fd, &err);
516 
517 	if (sock) {
518 		err = security_socket_getsockopt(sock, level, optname);
519 		if (err) {
520 			sockfd_put(sock);
521 			return err;
522 		}
523 
524 		if (level == SOL_SOCKET)
525 			err = compat_sock_getsockopt(sock, level,
526 					optname, optval, optlen);
527 		else if (sock->ops->compat_getsockopt)
528 			err = sock->ops->compat_getsockopt(sock, level,
529 					optname, optval, optlen);
530 		else
531 			err = sock->ops->getsockopt(sock, level,
532 					optname, optval, optlen);
533 		sockfd_put(sock);
534 	}
535 	return err;
536 }
537 
538 struct compat_group_req {
539 	__u32				 gr_interface;
540 	struct __kernel_sockaddr_storage gr_group
541 		__aligned(4);
542 } __packed;
543 
544 struct compat_group_source_req {
545 	__u32				 gsr_interface;
546 	struct __kernel_sockaddr_storage gsr_group
547 		__aligned(4);
548 	struct __kernel_sockaddr_storage gsr_source
549 		__aligned(4);
550 } __packed;
551 
552 struct compat_group_filter {
553 	__u32				 gf_interface;
554 	struct __kernel_sockaddr_storage gf_group
555 		__aligned(4);
556 	__u32				 gf_fmode;
557 	__u32				 gf_numsrc;
558 	struct __kernel_sockaddr_storage gf_slist[1]
559 		__aligned(4);
560 } __packed;
561 
562 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
563 			sizeof(struct __kernel_sockaddr_storage))
564 
565 
compat_mc_setsockopt(struct sock * sock,int level,int optname,char __user * optval,unsigned int optlen,int (* setsockopt)(struct sock *,int,int,char __user *,unsigned int))566 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
567 	char __user *optval, unsigned int optlen,
568 	int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
569 {
570 	char __user	*koptval = optval;
571 	int		koptlen = optlen;
572 
573 	switch (optname) {
574 	case MCAST_JOIN_GROUP:
575 	case MCAST_LEAVE_GROUP:
576 	{
577 		struct compat_group_req __user *gr32 = (void *)optval;
578 		struct group_req __user *kgr =
579 			compat_alloc_user_space(sizeof(struct group_req));
580 		u32 interface;
581 
582 		if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
583 		    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
584 		    __get_user(interface, &gr32->gr_interface) ||
585 		    __put_user(interface, &kgr->gr_interface) ||
586 		    copy_in_user(&kgr->gr_group, &gr32->gr_group,
587 				sizeof(kgr->gr_group)))
588 			return -EFAULT;
589 		koptval = (char __user *)kgr;
590 		koptlen = sizeof(struct group_req);
591 		break;
592 	}
593 	case MCAST_JOIN_SOURCE_GROUP:
594 	case MCAST_LEAVE_SOURCE_GROUP:
595 	case MCAST_BLOCK_SOURCE:
596 	case MCAST_UNBLOCK_SOURCE:
597 	{
598 		struct compat_group_source_req __user *gsr32 = (void *)optval;
599 		struct group_source_req __user *kgsr = compat_alloc_user_space(
600 			sizeof(struct group_source_req));
601 		u32 interface;
602 
603 		if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
604 		    !access_ok(VERIFY_WRITE, kgsr,
605 			sizeof(struct group_source_req)) ||
606 		    __get_user(interface, &gsr32->gsr_interface) ||
607 		    __put_user(interface, &kgsr->gsr_interface) ||
608 		    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
609 				sizeof(kgsr->gsr_group)) ||
610 		    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
611 				sizeof(kgsr->gsr_source)))
612 			return -EFAULT;
613 		koptval = (char __user *)kgsr;
614 		koptlen = sizeof(struct group_source_req);
615 		break;
616 	}
617 	case MCAST_MSFILTER:
618 	{
619 		struct compat_group_filter __user *gf32 = (void *)optval;
620 		struct group_filter __user *kgf;
621 		u32 interface, fmode, numsrc;
622 
623 		if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
624 		    __get_user(interface, &gf32->gf_interface) ||
625 		    __get_user(fmode, &gf32->gf_fmode) ||
626 		    __get_user(numsrc, &gf32->gf_numsrc))
627 			return -EFAULT;
628 		koptlen = optlen + sizeof(struct group_filter) -
629 				sizeof(struct compat_group_filter);
630 		if (koptlen < GROUP_FILTER_SIZE(numsrc))
631 			return -EINVAL;
632 		kgf = compat_alloc_user_space(koptlen);
633 		if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
634 		    __put_user(interface, &kgf->gf_interface) ||
635 		    __put_user(fmode, &kgf->gf_fmode) ||
636 		    __put_user(numsrc, &kgf->gf_numsrc) ||
637 		    copy_in_user(&kgf->gf_group, &gf32->gf_group,
638 				sizeof(kgf->gf_group)) ||
639 		    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
640 				numsrc * sizeof(kgf->gf_slist[0]))))
641 			return -EFAULT;
642 		koptval = (char __user *)kgf;
643 		break;
644 	}
645 
646 	default:
647 		break;
648 	}
649 	return setsockopt(sock, level, optname, koptval, koptlen);
650 }
651 EXPORT_SYMBOL(compat_mc_setsockopt);
652 
compat_mc_getsockopt(struct sock * sock,int level,int optname,char __user * optval,int __user * optlen,int (* getsockopt)(struct sock *,int,int,char __user *,int __user *))653 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
654 	char __user *optval, int __user *optlen,
655 	int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
656 {
657 	struct compat_group_filter __user *gf32 = (void *)optval;
658 	struct group_filter __user *kgf;
659 	int __user	*koptlen;
660 	u32 interface, fmode, numsrc;
661 	int klen, ulen, err;
662 
663 	if (optname != MCAST_MSFILTER)
664 		return getsockopt(sock, level, optname, optval, optlen);
665 
666 	koptlen = compat_alloc_user_space(sizeof(*koptlen));
667 	if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
668 	    __get_user(ulen, optlen))
669 		return -EFAULT;
670 
671 	/* adjust len for pad */
672 	klen = ulen + sizeof(*kgf) - sizeof(*gf32);
673 
674 	if (klen < GROUP_FILTER_SIZE(0))
675 		return -EINVAL;
676 
677 	if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
678 	    __put_user(klen, koptlen))
679 		return -EFAULT;
680 
681 	/* have to allow space for previous compat_alloc_user_space, too */
682 	kgf = compat_alloc_user_space(klen+sizeof(*optlen));
683 
684 	if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
685 	    __get_user(interface, &gf32->gf_interface) ||
686 	    __get_user(fmode, &gf32->gf_fmode) ||
687 	    __get_user(numsrc, &gf32->gf_numsrc) ||
688 	    __put_user(interface, &kgf->gf_interface) ||
689 	    __put_user(fmode, &kgf->gf_fmode) ||
690 	    __put_user(numsrc, &kgf->gf_numsrc) ||
691 	    copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
692 		return -EFAULT;
693 
694 	err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
695 	if (err)
696 		return err;
697 
698 	if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
699 	    __get_user(klen, koptlen))
700 		return -EFAULT;
701 
702 	ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
703 
704 	if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
705 	    __put_user(ulen, optlen))
706 		return -EFAULT;
707 
708 	if (!access_ok(VERIFY_READ, kgf, klen) ||
709 	    !access_ok(VERIFY_WRITE, gf32, ulen) ||
710 	    __get_user(interface, &kgf->gf_interface) ||
711 	    __get_user(fmode, &kgf->gf_fmode) ||
712 	    __get_user(numsrc, &kgf->gf_numsrc) ||
713 	    __put_user(interface, &gf32->gf_interface) ||
714 	    __put_user(fmode, &gf32->gf_fmode) ||
715 	    __put_user(numsrc, &gf32->gf_numsrc))
716 		return -EFAULT;
717 	if (numsrc) {
718 		int copylen;
719 
720 		klen -= GROUP_FILTER_SIZE(0);
721 		copylen = numsrc * sizeof(gf32->gf_slist[0]);
722 		if (copylen > klen)
723 			copylen = klen;
724 		if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
725 			return -EFAULT;
726 	}
727 	return err;
728 }
729 EXPORT_SYMBOL(compat_mc_getsockopt);
730 
731 
732 /* Argument list sizes for compat_sys_socketcall */
733 #define AL(x) ((x) * sizeof(u32))
734 static unsigned char nas[21] = {
735 	AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
736 	AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
737 	AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
738 	AL(4), AL(5), AL(4)
739 };
740 #undef AL
741 
COMPAT_SYSCALL_DEFINE3(sendmsg,int,fd,struct compat_msghdr __user *,msg,unsigned int,flags)742 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
743 {
744 	return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
745 }
746 
COMPAT_SYSCALL_DEFINE4(sendmmsg,int,fd,struct compat_mmsghdr __user *,mmsg,unsigned int,vlen,unsigned int,flags)747 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
748 		       unsigned int, vlen, unsigned int, flags)
749 {
750 	return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
751 			      flags | MSG_CMSG_COMPAT);
752 }
753 
COMPAT_SYSCALL_DEFINE3(recvmsg,int,fd,struct compat_msghdr __user *,msg,unsigned int,flags)754 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
755 {
756 	return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
757 }
758 
COMPAT_SYSCALL_DEFINE4(recv,int,fd,void __user *,buf,compat_size_t,len,unsigned int,flags)759 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
760 {
761 	return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
762 }
763 
COMPAT_SYSCALL_DEFINE6(recvfrom,int,fd,void __user *,buf,compat_size_t,len,unsigned int,flags,struct sockaddr __user *,addr,int __user *,addrlen)764 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
765 		       unsigned int, flags, struct sockaddr __user *, addr,
766 		       int __user *, addrlen)
767 {
768 	return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
769 }
770 
COMPAT_SYSCALL_DEFINE5(recvmmsg,int,fd,struct compat_mmsghdr __user *,mmsg,unsigned int,vlen,unsigned int,flags,struct compat_timespec __user *,timeout)771 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
772 		       unsigned int, vlen, unsigned int, flags,
773 		       struct compat_timespec __user *, timeout)
774 {
775 	int datagrams;
776 	struct timespec ktspec;
777 
778 	if (timeout == NULL)
779 		return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
780 				      flags | MSG_CMSG_COMPAT, NULL);
781 
782 	if (compat_get_timespec(&ktspec, timeout))
783 		return -EFAULT;
784 
785 	datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
786 				   flags | MSG_CMSG_COMPAT, &ktspec);
787 	if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
788 		datagrams = -EFAULT;
789 
790 	return datagrams;
791 }
792 
COMPAT_SYSCALL_DEFINE2(socketcall,int,call,u32 __user *,args)793 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
794 {
795 	u32 a[AUDITSC_ARGS];
796 	unsigned int len;
797 	u32 a0, a1;
798 	int ret;
799 
800 	if (call < SYS_SOCKET || call > SYS_SENDMMSG)
801 		return -EINVAL;
802 	len = nas[call];
803 	if (len > sizeof(a))
804 		return -EINVAL;
805 
806 	if (copy_from_user(a, args, len))
807 		return -EFAULT;
808 
809 	ret = audit_socketcall_compat(len / sizeof(a[0]), a);
810 	if (ret)
811 		return ret;
812 
813 	a0 = a[0];
814 	a1 = a[1];
815 
816 	switch (call) {
817 	case SYS_SOCKET:
818 		ret = sys_socket(a0, a1, a[2]);
819 		break;
820 	case SYS_BIND:
821 		ret = sys_bind(a0, compat_ptr(a1), a[2]);
822 		break;
823 	case SYS_CONNECT:
824 		ret = sys_connect(a0, compat_ptr(a1), a[2]);
825 		break;
826 	case SYS_LISTEN:
827 		ret = sys_listen(a0, a1);
828 		break;
829 	case SYS_ACCEPT:
830 		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
831 		break;
832 	case SYS_GETSOCKNAME:
833 		ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
834 		break;
835 	case SYS_GETPEERNAME:
836 		ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
837 		break;
838 	case SYS_SOCKETPAIR:
839 		ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
840 		break;
841 	case SYS_SEND:
842 		ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
843 		break;
844 	case SYS_SENDTO:
845 		ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
846 		break;
847 	case SYS_RECV:
848 		ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
849 		break;
850 	case SYS_RECVFROM:
851 		ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
852 					  compat_ptr(a[4]), compat_ptr(a[5]));
853 		break;
854 	case SYS_SHUTDOWN:
855 		ret = sys_shutdown(a0, a1);
856 		break;
857 	case SYS_SETSOCKOPT:
858 		ret = compat_sys_setsockopt(a0, a1, a[2],
859 				compat_ptr(a[3]), a[4]);
860 		break;
861 	case SYS_GETSOCKOPT:
862 		ret = compat_sys_getsockopt(a0, a1, a[2],
863 				compat_ptr(a[3]), compat_ptr(a[4]));
864 		break;
865 	case SYS_SENDMSG:
866 		ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
867 		break;
868 	case SYS_SENDMMSG:
869 		ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
870 		break;
871 	case SYS_RECVMSG:
872 		ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
873 		break;
874 	case SYS_RECVMMSG:
875 		ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
876 					  compat_ptr(a[4]));
877 		break;
878 	case SYS_ACCEPT4:
879 		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
880 		break;
881 	default:
882 		ret = -EINVAL;
883 		break;
884 	}
885 	return ret;
886 }
887