compat.c 24.2 KB
Newer Older
1
/*
L
Linus Torvalds 已提交
2 3 4 5 6 7 8 9 10
 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
 *
 * Copyright (C) 2000		VA Linux Co
 * Copyright (C) 2000		Don Dugger <n0ano@valinux.com>
 * Copyright (C) 1999 		Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 1997,1998 	Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 		David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 2000		Hewlett-Packard Co.
 * Copyright (C) 2000		David Mosberger-Tang <davidm@hpl.hp.com>
11
 * Copyright (C) 2000,2001	Andi Kleen, SuSE Labs
L
Linus Torvalds 已提交
12 13 14
 */

#include <linux/kernel.h>
15
#include <linux/gfp.h>
L
Linus Torvalds 已提交
16 17 18 19 20 21 22 23 24
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/file.h>
#include <linux/icmpv6.h>
#include <linux/socket.h>
#include <linux/syscalls.h>
#include <linux/filter.h>
#include <linux/compat.h>
#include <linux/security.h>
25
#include <linux/audit.h>
26
#include <linux/export.h>
L
Linus Torvalds 已提交
27 28 29

#include <net/scm.h>
#include <net/sock.h>
30 31
#include <net/ip.h>
#include <net/ipv6.h>
32
#include <linux/uaccess.h>
L
Linus Torvalds 已提交
33 34
#include <net/compat.h>

35 36 37 38
int get_compat_msghdr(struct msghdr *kmsg,
		      struct compat_msghdr __user *umsg,
		      struct sockaddr __user **save_addr,
		      struct iovec **iov)
L
Linus Torvalds 已提交
39
{
40
	struct compat_msghdr msg;
41
	ssize_t err;
L
Linus Torvalds 已提交
42

43
	if (copy_from_user(&msg, umsg, sizeof(*umsg)))
L
Linus Torvalds 已提交
44
		return -EFAULT;
45

46 47 48 49
	kmsg->msg_flags = msg.msg_flags;
	kmsg->msg_namelen = msg.msg_namelen;

	if (!msg.msg_name)
50 51 52 53 54
		kmsg->msg_namelen = 0;

	if (kmsg->msg_namelen < 0)
		return -EINVAL;

55
	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
56
		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
57 58 59

	kmsg->msg_control = compat_ptr(msg.msg_control);
	kmsg->msg_controllen = msg.msg_controllen;
L
Linus Torvalds 已提交
60

61
	if (save_addr)
62
		*save_addr = compat_ptr(msg.msg_name);
L
Linus Torvalds 已提交
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 68
						  kmsg->msg_namelen,
						  kmsg->msg_name);
69
			if (err < 0)
L
Linus Torvalds 已提交
70 71
				return err;
		}
72
	} else {
73 74
		kmsg->msg_name = NULL;
		kmsg->msg_namelen = 0;
75
	}
L
Linus Torvalds 已提交
76

77
	if (msg.msg_iovlen > UIO_MAXIOV)
78 79
		return -EMSGSIZE;

80 81
	kmsg->msg_iocb = NULL;

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);
L
Linus Torvalds 已提交
85 86 87 88 89 90
}

/* Bleech... */
#define CMSG_COMPAT_ALIGN(len)	ALIGN((len), sizeof(s32))

#define CMSG_COMPAT_DATA(cmsg)				\
91
	((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
L
Linus Torvalds 已提交
92
#define CMSG_COMPAT_SPACE(len)				\
93
	(sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
L
Linus Torvalds 已提交
94
#define CMSG_COMPAT_LEN(len)				\
95
	(sizeof(struct compat_cmsghdr) + (len))
L
Linus Torvalds 已提交
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121

#define CMSG_COMPAT_FIRSTHDR(msg)			\
	(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?	\
	 (struct compat_cmsghdr __user *)((msg)->msg_control) :		\
	 (struct compat_cmsghdr __user *)NULL)

#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
	((ucmlen) >= sizeof(struct compat_cmsghdr) && \
	 (ucmlen) <= (unsigned long) \
	 ((mhdr)->msg_controllen - \
	  ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))

static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
		struct compat_cmsghdr __user *cmsg, int cmsg_len)
{
	char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
	if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
			msg->msg_controllen)
		return NULL;
	return (struct compat_cmsghdr __user *)ptr;
}

/* There is a lot of hair here because the alignment rules (and
 * thus placement) of cmsg headers and length are different for
 * 32-bit apps.  -DaveM
 */
A
Al Viro 已提交
122
int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
L
Linus Torvalds 已提交
123 124 125 126 127 128
			       unsigned char *stackbuf, int stackbuf_size)
{
	struct compat_cmsghdr __user *ucmsg;
	struct cmsghdr *kcmsg, *kcmsg_base;
	compat_size_t ucmlen;
	__kernel_size_t kcmlen, tmp;
A
Al Viro 已提交
129
	int err = -EFAULT;
L
Linus Torvalds 已提交
130

131 132 133
	BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
		     CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));

L
Linus Torvalds 已提交
134 135 136
	kcmlen = 0;
	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
137 138
	while (ucmsg != NULL) {
		if (get_user(ucmlen, &ucmsg->cmsg_len))
L
Linus Torvalds 已提交
139 140 141 142 143 144
			return -EFAULT;

		/* Catch bogons. */
		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
			return -EINVAL;

145
		tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
A
Al Viro 已提交
146
		tmp = CMSG_ALIGN(tmp);
L
Linus Torvalds 已提交
147 148 149
		kcmlen += tmp;
		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
	}
150
	if (kcmlen == 0)
L
Linus Torvalds 已提交
151 152 153 154 155 156 157
		return -EINVAL;

	/* The kcmlen holds the 64-bit version of the control length.
	 * It may not be modified as we do not stick it into the kmsg
	 * until we have successfully copied over all of the data
	 * from the user.
	 */
A
Al Viro 已提交
158 159 160
	if (kcmlen > stackbuf_size)
		kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
	if (kcmsg == NULL)
L
Linus Torvalds 已提交
161 162 163 164 165
		return -ENOBUFS;

	/* Now copy them over neatly. */
	memset(kcmsg, 0, kcmlen);
	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
166
	while (ucmsg != NULL) {
A
Al Viro 已提交
167 168 169 170
		if (__get_user(ucmlen, &ucmsg->cmsg_len))
			goto Efault;
		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
			goto Einval;
171
		tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
A
Al Viro 已提交
172 173
		if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
			goto Einval;
L
Linus Torvalds 已提交
174
		kcmsg->cmsg_len = tmp;
A
Al Viro 已提交
175 176 177 178 179
		tmp = CMSG_ALIGN(tmp);
		if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
		    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
		    copy_from_user(CMSG_DATA(kcmsg),
				   CMSG_COMPAT_DATA(ucmsg),
180
				   (ucmlen - sizeof(*ucmsg))))
A
Al Viro 已提交
181
			goto Efault;
L
Linus Torvalds 已提交
182 183

		/* Advance. */
A
Al Viro 已提交
184
		kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
L
Linus Torvalds 已提交
185 186 187 188 189 190 191 192
		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
	}

	/* Ok, looks like we made it.  Hook it up and return success. */
	kmsg->msg_control = kcmsg_base;
	kmsg->msg_controllen = kcmlen;
	return 0;

A
Al Viro 已提交
193 194 195 196 197 198
Einval:
	err = -EINVAL;
Efault:
	if (kcmsg_base != (struct cmsghdr *)stackbuf)
		sock_kfree_s(sk, kcmsg_base, kcmlen);
	return err;
L
Linus Torvalds 已提交
199 200 201 202 203 204
}

int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
{
	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
	struct compat_cmsghdr cmhdr;
205 206
	struct compat_timeval ctv;
	struct compat_timespec cts[3];
L
Linus Torvalds 已提交
207 208
	int cmlen;

209
	if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
L
Linus Torvalds 已提交
210 211 212 213
		kmsg->msg_flags |= MSG_CTRUNC;
		return 0; /* XXX: return error? check spec. */
	}

214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232
	if (!COMPAT_USE_64BIT_TIME) {
		if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
			struct timeval *tv = (struct timeval *)data;
			ctv.tv_sec = tv->tv_sec;
			ctv.tv_usec = tv->tv_usec;
			data = &ctv;
			len = sizeof(ctv);
		}
		if (level == SOL_SOCKET &&
		    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
			int count = type == SCM_TIMESTAMPNS ? 1 : 3;
			int i;
			struct timespec *ts = (struct timespec *)data;
			for (i = 0; i < count; i++) {
				cts[i].tv_sec = ts[i].tv_sec;
				cts[i].tv_nsec = ts[i].tv_nsec;
			}
			data = &cts;
			len = sizeof(cts[0]) * count;
233
		}
234 235
	}

L
Linus Torvalds 已提交
236
	cmlen = CMSG_COMPAT_LEN(len);
237
	if (kmsg->msg_controllen < cmlen) {
L
Linus Torvalds 已提交
238 239 240 241 242 243 244
		kmsg->msg_flags |= MSG_CTRUNC;
		cmlen = kmsg->msg_controllen;
	}
	cmhdr.cmsg_level = level;
	cmhdr.cmsg_type = type;
	cmhdr.cmsg_len = cmlen;

245
	if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
L
Linus Torvalds 已提交
246
		return -EFAULT;
247
	if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
L
Linus Torvalds 已提交
248 249
		return -EFAULT;
	cmlen = CMSG_COMPAT_SPACE(len);
250 251
	if (kmsg->msg_controllen < cmlen)
		cmlen = kmsg->msg_controllen;
L
Linus Torvalds 已提交
252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
	kmsg->msg_control += cmlen;
	kmsg->msg_controllen -= cmlen;
	return 0;
}

void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
{
	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
	int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
	int fdnum = scm->fp->count;
	struct file **fp = scm->fp->fp;
	int __user *cmfptr;
	int err = 0, i;

	if (fdnum < fdmax)
		fdmax = fdnum;

	for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
		int new_fd;
		err = security_file_receive(fp[i]);
		if (err)
			break;
U
Ulrich Drepper 已提交
274 275
		err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
					  ? O_CLOEXEC : 0);
L
Linus Torvalds 已提交
276 277 278 279 280 281 282 283 284
		if (err < 0)
			break;
		new_fd = err;
		err = put_user(new_fd, cmfptr);
		if (err) {
			put_unused_fd(new_fd);
			break;
		}
		/* Bump the usage count and install the file. */
A
Al Viro 已提交
285
		fd_install(new_fd, get_file(fp[i]));
L
Linus Torvalds 已提交
286 287 288 289
	}

	if (i > 0) {
		int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
290
		err = put_user(SOL_SOCKET, &cm->cmsg_level);
L
Linus Torvalds 已提交
291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310
		if (!err)
			err = put_user(SCM_RIGHTS, &cm->cmsg_type);
		if (!err)
			err = put_user(cmlen, &cm->cmsg_len);
		if (!err) {
			cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
			kmsg->msg_control += cmlen;
			kmsg->msg_controllen -= cmlen;
		}
	}
	if (i < fdnum)
		kmsg->msg_flags |= MSG_CTRUNC;

	/*
	 * All of the files that fit in the message have had their
	 * usage counts incremented, so we just free the list.
	 */
	__scm_destroy(scm);
}

311 312
/* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
L
Linus Torvalds 已提交
313 314
{
	struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
315
	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
L
Linus Torvalds 已提交
316 317 318 319 320 321 322 323 324
	compat_uptr_t ptr;
	u16 len;

	if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
	    !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
	    __get_user(len, &fprog32->len) ||
	    __get_user(ptr, &fprog32->filter) ||
	    __put_user(len, &kfprog->len) ||
	    __put_user(compat_ptr(ptr), &kfprog->filter))
325 326 327 328 329 330 331 332 333 334 335 336 337
		return NULL;

	return kfprog;
}
EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);

static int do_set_attach_filter(struct socket *sock, int level, int optname,
				char __user *optval, unsigned int optlen)
{
	struct sock_fprog __user *kfprog;

	kfprog = get_compat_bpf_fprog(optval);
	if (!kfprog)
L
Linus Torvalds 已提交
338 339
		return -EFAULT;

340
	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
L
Linus Torvalds 已提交
341 342 343
			      sizeof(struct sock_fprog));
}

344
static int do_set_sock_timeout(struct socket *sock, int level,
345
		int optname, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
346
{
347
	struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
L
Linus Torvalds 已提交
348 349 350 351 352 353 354 355 356 357 358 359
	struct timeval ktime;
	mm_segment_t old_fs;
	int err;

	if (optlen < sizeof(*up))
		return -EINVAL;
	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
	    __get_user(ktime.tv_sec, &up->tv_sec) ||
	    __get_user(ktime.tv_usec, &up->tv_usec))
		return -EFAULT;
	old_fs = get_fs();
	set_fs(KERNEL_DS);
360
	err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
L
Linus Torvalds 已提交
361 362 363 364 365
	set_fs(old_fs);

	return err;
}

366
static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
367
				char __user *optval, unsigned int optlen)
368
{
369 370
	if (optname == SO_ATTACH_FILTER ||
	    optname == SO_ATTACH_REUSEPORT_CBPF)
371 372 373 374 375 376 377 378
		return do_set_attach_filter(sock, level, optname,
					    optval, optlen);
	if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
		return do_set_sock_timeout(sock, level, optname, optval, optlen);

	return sock_setsockopt(sock, level, optname, optval, optlen);
}

379 380
COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
		       char __user *, optval, unsigned int, optlen)
L
Linus Torvalds 已提交
381
{
382
	int err;
383
	struct socket *sock = sockfd_lookup(fd, &err);
384

385 386
	if (sock) {
		err = security_socket_setsockopt(sock, level, optname);
387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403
		if (err) {
			sockfd_put(sock);
			return err;
		}

		if (level == SOL_SOCKET)
			err = compat_sock_setsockopt(sock, level,
					optname, optval, optlen);
		else if (sock->ops->compat_setsockopt)
			err = sock->ops->compat_setsockopt(sock, level,
					optname, optval, optlen);
		else
			err = sock->ops->setsockopt(sock, level,
					optname, optval, optlen);
		sockfd_put(sock);
	}
	return err;
L
Linus Torvalds 已提交
404 405
}

406
static int do_get_sock_timeout(struct socket *sock, int level, int optname,
L
Linus Torvalds 已提交
407 408 409 410 411 412 413 414 415 416 417 418 419 420 421
		char __user *optval, int __user *optlen)
{
	struct compat_timeval __user *up;
	struct timeval ktime;
	mm_segment_t old_fs;
	int len, err;

	up = (struct compat_timeval __user *) optval;
	if (get_user(len, optlen))
		return -EFAULT;
	if (len < sizeof(*up))
		return -EINVAL;
	len = sizeof(ktime);
	old_fs = get_fs();
	set_fs(KERNEL_DS);
422
	err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
L
Linus Torvalds 已提交
423 424 425 426 427 428 429 430 431 432 433 434
	set_fs(old_fs);

	if (!err) {
		if (put_user(sizeof(*up), optlen) ||
		    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
		    __put_user(ktime.tv_sec, &up->tv_sec) ||
		    __put_user(ktime.tv_usec, &up->tv_usec))
			err = -EFAULT;
	}
	return err;
}

435
static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
L
Linus Torvalds 已提交
436 437
				char __user *optval, int __user *optlen)
{
438 439 440
	if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
		return do_get_sock_timeout(sock, level, optname, optval, optlen);
	return sock_getsockopt(sock, level, optname, optval, optlen);
L
Linus Torvalds 已提交
441 442
}

443 444
int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
{
445 446
	struct compat_timeval __user *ctv;
	int err;
447
	struct timeval tv;
448

449 450 451 452 453
	if (COMPAT_USE_64BIT_TIME)
		return sock_get_timestamp(sk, userstamp);

	ctv = (struct compat_timeval __user *) userstamp;
	err = -ENOENT;
454
	if (!sock_flag(sk, SOCK_TIMESTAMP))
455
		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
456 457
	tv = ktime_to_timeval(sk->sk_stamp);
	if (tv.tv_sec == -1)
458
		return err;
459 460 461 462 463 464 465
	if (tv.tv_sec == 0) {
		sk->sk_stamp = ktime_get_real();
		tv = ktime_to_timeval(sk->sk_stamp);
	}
	err = 0;
	if (put_user(tv.tv_sec, &ctv->tv_sec) ||
			put_user(tv.tv_usec, &ctv->tv_usec))
466 467 468 469 470
		err = -EFAULT;
	return err;
}
EXPORT_SYMBOL(compat_sock_get_timestamp);

471 472
int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
{
473 474
	struct compat_timespec __user *ctv;
	int err;
475 476
	struct timespec ts;

477 478 479 480 481
	if (COMPAT_USE_64BIT_TIME)
		return sock_get_timestampns (sk, userstamp);

	ctv = (struct compat_timespec __user *) userstamp;
	err = -ENOENT;
482
	if (!sock_flag(sk, SOCK_TIMESTAMP))
483
		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
484 485 486 487 488 489 490 491 492 493 494 495 496 497 498
	ts = ktime_to_timespec(sk->sk_stamp);
	if (ts.tv_sec == -1)
		return err;
	if (ts.tv_sec == 0) {
		sk->sk_stamp = ktime_get_real();
		ts = ktime_to_timespec(sk->sk_stamp);
	}
	err = 0;
	if (put_user(ts.tv_sec, &ctv->tv_sec) ||
			put_user(ts.tv_nsec, &ctv->tv_nsec))
		err = -EFAULT;
	return err;
}
EXPORT_SYMBOL(compat_sock_get_timestampns);

499 500
COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
		       char __user *, optval, int __user *, optlen)
501 502
{
	int err;
503
	struct socket *sock = sockfd_lookup(fd, &err);
504

505 506
	if (sock) {
		err = security_socket_getsockopt(sock, level, optname);
507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524
		if (err) {
			sockfd_put(sock);
			return err;
		}

		if (level == SOL_SOCKET)
			err = compat_sock_getsockopt(sock, level,
					optname, optval, optlen);
		else if (sock->ops->compat_getsockopt)
			err = sock->ops->compat_getsockopt(sock, level,
					optname, optval, optlen);
		else
			err = sock->ops->getsockopt(sock, level,
					optname, optval, optlen);
		sockfd_put(sock);
	}
	return err;
}
525 526 527 528

struct compat_group_req {
	__u32				 gr_interface;
	struct __kernel_sockaddr_storage gr_group
529
		__aligned(4);
E
Eric Dumazet 已提交
530
} __packed;
531 532 533 534

struct compat_group_source_req {
	__u32				 gsr_interface;
	struct __kernel_sockaddr_storage gsr_group
535
		__aligned(4);
536
	struct __kernel_sockaddr_storage gsr_source
537
		__aligned(4);
E
Eric Dumazet 已提交
538
} __packed;
539 540 541 542

struct compat_group_filter {
	__u32				 gf_interface;
	struct __kernel_sockaddr_storage gf_group
543
		__aligned(4);
544 545 546
	__u32				 gf_fmode;
	__u32				 gf_numsrc;
	struct __kernel_sockaddr_storage gf_slist[1]
547
		__aligned(4);
E
Eric Dumazet 已提交
548
} __packed;
549

550 551 552
#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
			sizeof(struct __kernel_sockaddr_storage))

553 554

int compat_mc_setsockopt(struct sock *sock, int level, int optname,
555
	char __user *optval, unsigned int optlen,
556
	int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586
{
	char __user	*koptval = optval;
	int		koptlen = optlen;

	switch (optname) {
	case MCAST_JOIN_GROUP:
	case MCAST_LEAVE_GROUP:
	{
		struct compat_group_req __user *gr32 = (void *)optval;
		struct group_req __user *kgr =
			compat_alloc_user_space(sizeof(struct group_req));
		u32 interface;

		if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
		    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
		    __get_user(interface, &gr32->gr_interface) ||
		    __put_user(interface, &kgr->gr_interface) ||
		    copy_in_user(&kgr->gr_group, &gr32->gr_group,
				sizeof(kgr->gr_group)))
			return -EFAULT;
		koptval = (char __user *)kgr;
		koptlen = sizeof(struct group_req);
		break;
	}
	case MCAST_JOIN_SOURCE_GROUP:
	case MCAST_LEAVE_SOURCE_GROUP:
	case MCAST_BLOCK_SOURCE:
	case MCAST_UNBLOCK_SOURCE:
	{
		struct compat_group_source_req __user *gsr32 = (void *)optval;
587
		struct group_source_req __user *kgsr = compat_alloc_user_space(
588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607
			sizeof(struct group_source_req));
		u32 interface;

		if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
		    !access_ok(VERIFY_WRITE, kgsr,
			sizeof(struct group_source_req)) ||
		    __get_user(interface, &gsr32->gsr_interface) ||
		    __put_user(interface, &kgsr->gsr_interface) ||
		    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
				sizeof(kgsr->gsr_group)) ||
		    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
				sizeof(kgsr->gsr_source)))
			return -EFAULT;
		koptval = (char __user *)kgsr;
		koptlen = sizeof(struct group_source_req);
		break;
	}
	case MCAST_MSFILTER:
	{
		struct compat_group_filter __user *gf32 = (void *)optval;
608
		struct group_filter __user *kgf;
609 610
		u32 interface, fmode, numsrc;

611
		if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626
		    __get_user(interface, &gf32->gf_interface) ||
		    __get_user(fmode, &gf32->gf_fmode) ||
		    __get_user(numsrc, &gf32->gf_numsrc))
			return -EFAULT;
		koptlen = optlen + sizeof(struct group_filter) -
				sizeof(struct compat_group_filter);
		if (koptlen < GROUP_FILTER_SIZE(numsrc))
			return -EINVAL;
		kgf = compat_alloc_user_space(koptlen);
		if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
		    __put_user(interface, &kgf->gf_interface) ||
		    __put_user(fmode, &kgf->gf_fmode) ||
		    __put_user(numsrc, &kgf->gf_numsrc) ||
		    copy_in_user(&kgf->gf_group, &gf32->gf_group,
				sizeof(kgf->gf_group)) ||
627
		    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
628 629 630 631 632 633 634 635 636 637 638 639 640
				numsrc * sizeof(kgf->gf_slist[0]))))
			return -EFAULT;
		koptval = (char __user *)kgf;
		break;
	}

	default:
		break;
	}
	return setsockopt(sock, level, optname, koptval, koptlen);
}
EXPORT_SYMBOL(compat_mc_setsockopt);

641 642
int compat_mc_getsockopt(struct sock *sock, int level, int optname,
	char __user *optval, int __user *optlen,
643
	int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
{
	struct compat_group_filter __user *gf32 = (void *)optval;
	struct group_filter __user *kgf;
	int __user	*koptlen;
	u32 interface, fmode, numsrc;
	int klen, ulen, err;

	if (optname != MCAST_MSFILTER)
		return getsockopt(sock, level, optname, optval, optlen);

	koptlen = compat_alloc_user_space(sizeof(*koptlen));
	if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
	    __get_user(ulen, optlen))
		return -EFAULT;

	/* adjust len for pad */
	klen = ulen + sizeof(*kgf) - sizeof(*gf32);

	if (klen < GROUP_FILTER_SIZE(0))
		return -EINVAL;

	if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
	    __put_user(klen, koptlen))
		return -EFAULT;

	/* have to allow space for previous compat_alloc_user_space, too */
	kgf = compat_alloc_user_space(klen+sizeof(*optlen));

	if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
	    __get_user(interface, &gf32->gf_interface) ||
	    __get_user(fmode, &gf32->gf_fmode) ||
	    __get_user(numsrc, &gf32->gf_numsrc) ||
	    __put_user(interface, &kgf->gf_interface) ||
	    __put_user(fmode, &kgf->gf_fmode) ||
	    __put_user(numsrc, &kgf->gf_numsrc) ||
679
	    copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
		return -EFAULT;

	err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
	if (err)
		return err;

	if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
	    __get_user(klen, koptlen))
		return -EFAULT;

	ulen = klen - (sizeof(*kgf)-sizeof(*gf32));

	if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
	    __put_user(ulen, optlen))
		return -EFAULT;

	if (!access_ok(VERIFY_READ, kgf, klen) ||
	    !access_ok(VERIFY_WRITE, gf32, ulen) ||
	    __get_user(interface, &kgf->gf_interface) ||
	    __get_user(fmode, &kgf->gf_fmode) ||
	    __get_user(numsrc, &kgf->gf_numsrc) ||
	    __put_user(interface, &gf32->gf_interface) ||
	    __put_user(fmode, &gf32->gf_fmode) ||
	    __put_user(numsrc, &gf32->gf_numsrc))
		return -EFAULT;
	if (numsrc) {
		int copylen;

		klen -= GROUP_FILTER_SIZE(0);
		copylen = numsrc * sizeof(gf32->gf_slist[0]);
		if (copylen > klen)
			copylen = klen;
712
		if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
713 714 715 716 717 718
			return -EFAULT;
	}
	return err;
}
EXPORT_SYMBOL(compat_mc_getsockopt);

719

L
Linus Torvalds 已提交
720 721
/* Argument list sizes for compat_sys_socketcall */
#define AL(x) ((x) * sizeof(u32))
722
static unsigned char nas[21] = {
723 724 725
	AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
	AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
	AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
726
	AL(4), AL(5), AL(4)
727
};
L
Linus Torvalds 已提交
728 729
#undef AL

730
COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
L
Linus Torvalds 已提交
731
{
732
	return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
L
Linus Torvalds 已提交
733 734
}

735 736
COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
		       unsigned int, vlen, unsigned int, flags)
737 738 739 740 741
{
	return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
			      flags | MSG_CMSG_COMPAT);
}

742
COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
L
Linus Torvalds 已提交
743
{
744
	return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
L
Linus Torvalds 已提交
745 746
}

747
COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
748 749 750 751
{
	return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
}

752 753 754
COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
		       unsigned int, flags, struct sockaddr __user *, addr,
		       int __user *, addrlen)
755 756 757 758
{
	return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
}

759 760 761
COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
		       unsigned int, vlen, unsigned int, flags,
		       struct compat_timespec __user *, timeout)
762 763 764 765
{
	int datagrams;
	struct timespec ktspec;

766 767 768 769
	if (timeout == NULL)
		return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
				      flags | MSG_CMSG_COMPAT, NULL);

770
	if (compat_get_timespec(&ktspec, timeout))
771 772 773 774
		return -EFAULT;

	datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
				   flags | MSG_CMSG_COMPAT, &ktspec);
775
	if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
776 777 778 779 780
		datagrams = -EFAULT;

	return datagrams;
}

781
COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
L
Linus Torvalds 已提交
782
{
783 784
	u32 a[AUDITSC_ARGS];
	unsigned int len;
L
Linus Torvalds 已提交
785
	u32 a0, a1;
786
	int ret;
787

788
	if (call < SYS_SOCKET || call > SYS_SENDMMSG)
L
Linus Torvalds 已提交
789
		return -EINVAL;
790 791 792 793 794
	len = nas[call];
	if (len > sizeof(a))
		return -EINVAL;

	if (copy_from_user(a, args, len))
L
Linus Torvalds 已提交
795
		return -EFAULT;
796 797 798 799 800

	ret = audit_socketcall_compat(len / sizeof(a[0]), a);
	if (ret)
		return ret;

L
Linus Torvalds 已提交
801 802
	a0 = a[0];
	a1 = a[1];
803

804
	switch (call) {
L
Linus Torvalds 已提交
805 806 807 808 809 810 811 812 813 814 815 816 817
	case SYS_SOCKET:
		ret = sys_socket(a0, a1, a[2]);
		break;
	case SYS_BIND:
		ret = sys_bind(a0, compat_ptr(a1), a[2]);
		break;
	case SYS_CONNECT:
		ret = sys_connect(a0, compat_ptr(a1), a[2]);
		break;
	case SYS_LISTEN:
		ret = sys_listen(a0, a1);
		break;
	case SYS_ACCEPT:
U
Ulrich Drepper 已提交
818
		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
L
Linus Torvalds 已提交
819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
		break;
	case SYS_GETSOCKNAME:
		ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
		break;
	case SYS_GETPEERNAME:
		ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
		break;
	case SYS_SOCKETPAIR:
		ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
		break;
	case SYS_SEND:
		ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
		break;
	case SYS_SENDTO:
		ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
		break;
	case SYS_RECV:
836
		ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
L
Linus Torvalds 已提交
837 838
		break;
	case SYS_RECVFROM:
839 840
		ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
					  compat_ptr(a[4]), compat_ptr(a[5]));
L
Linus Torvalds 已提交
841 842
		break;
	case SYS_SHUTDOWN:
843
		ret = sys_shutdown(a0, a1);
L
Linus Torvalds 已提交
844 845 846 847 848 849 850 851 852 853 854 855
		break;
	case SYS_SETSOCKOPT:
		ret = compat_sys_setsockopt(a0, a1, a[2],
				compat_ptr(a[3]), a[4]);
		break;
	case SYS_GETSOCKOPT:
		ret = compat_sys_getsockopt(a0, a1, a[2],
				compat_ptr(a[3]), compat_ptr(a[4]));
		break;
	case SYS_SENDMSG:
		ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
		break;
856 857 858
	case SYS_SENDMMSG:
		ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
		break;
L
Linus Torvalds 已提交
859 860 861
	case SYS_RECVMSG:
		ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
		break;
862 863 864 865
	case SYS_RECVMMSG:
		ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
					  compat_ptr(a[4]));
		break;
U
Ulrich Drepper 已提交
866 867
	case SYS_ACCEPT4:
		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
U
Ulrich Drepper 已提交
868
		break;
L
Linus Torvalds 已提交
869 870 871 872 873 874
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}