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 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))) 107 108 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 */ 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 } 207 208 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 } 263 264 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. */ 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); 337 338 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 } 350 351 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 } 372 373 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 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 381 return do_set_sock_timeout(sock, level, optname, optval, optlen); 382 383 return sock_setsockopt(sock, level, optname, optval, optlen); 384 } 385 386 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 387 char __user *, optval, unsigned int, optlen) 388 { 389 int err; 390 struct socket *sock = sockfd_lookup(fd, &err); 391 392 if (sock) { 393 err = security_socket_setsockopt(sock, level, optname); 394 if (err) { 395 sockfd_put(sock); 396 return err; 397 } 398 399 if (level == SOL_SOCKET) 400 err = compat_sock_setsockopt(sock, level, 401 optname, optval, optlen); 402 else if (sock->ops->compat_setsockopt) 403 err = sock->ops->compat_setsockopt(sock, level, 404 optname, optval, optlen); 405 else 406 err = sock->ops->setsockopt(sock, level, 407 optname, optval, optlen); 408 sockfd_put(sock); 409 } 410 return err; 411 } 412 413 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 414 char __user *optval, int __user *optlen) 415 { 416 struct compat_timeval __user *up; 417 struct timeval ktime; 418 mm_segment_t old_fs; 419 int len, err; 420 421 up = (struct compat_timeval __user *) optval; 422 if (get_user(len, optlen)) 423 return -EFAULT; 424 if (len < sizeof(*up)) 425 return -EINVAL; 426 len = sizeof(ktime); 427 old_fs = get_fs(); 428 set_fs(KERNEL_DS); 429 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 430 set_fs(old_fs); 431 432 if (!err) { 433 if (put_user(sizeof(*up), optlen) || 434 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 435 __put_user(ktime.tv_sec, &up->tv_sec) || 436 __put_user(ktime.tv_usec, &up->tv_usec)) 437 err = -EFAULT; 438 } 439 return err; 440 } 441 442 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 443 char __user *optval, int __user *optlen) 444 { 445 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 446 return do_get_sock_timeout(sock, level, optname, optval, optlen); 447 return sock_getsockopt(sock, level, optname, optval, optlen); 448 } 449 450 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 451 { 452 struct compat_timeval __user *ctv; 453 int err; 454 struct timeval tv; 455 456 if (COMPAT_USE_64BIT_TIME) 457 return sock_get_timestamp(sk, userstamp); 458 459 ctv = (struct compat_timeval __user *) userstamp; 460 err = -ENOENT; 461 if (!sock_flag(sk, SOCK_TIMESTAMP)) 462 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 463 tv = ktime_to_timeval(sk->sk_stamp); 464 if (tv.tv_sec == -1) 465 return err; 466 if (tv.tv_sec == 0) { 467 sk->sk_stamp = ktime_get_real(); 468 tv = ktime_to_timeval(sk->sk_stamp); 469 } 470 err = 0; 471 if (put_user(tv.tv_sec, &ctv->tv_sec) || 472 put_user(tv.tv_usec, &ctv->tv_usec)) 473 err = -EFAULT; 474 return err; 475 } 476 EXPORT_SYMBOL(compat_sock_get_timestamp); 477 478 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 479 { 480 struct compat_timespec __user *ctv; 481 int err; 482 struct timespec ts; 483 484 if (COMPAT_USE_64BIT_TIME) 485 return sock_get_timestampns (sk, userstamp); 486 487 ctv = (struct compat_timespec __user *) userstamp; 488 err = -ENOENT; 489 if (!sock_flag(sk, SOCK_TIMESTAMP)) 490 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 491 ts = ktime_to_timespec(sk->sk_stamp); 492 if (ts.tv_sec == -1) 493 return err; 494 if (ts.tv_sec == 0) { 495 sk->sk_stamp = ktime_get_real(); 496 ts = ktime_to_timespec(sk->sk_stamp); 497 } 498 err = 0; 499 if (put_user(ts.tv_sec, &ctv->tv_sec) || 500 put_user(ts.tv_nsec, &ctv->tv_nsec)) 501 err = -EFAULT; 502 return err; 503 } 504 EXPORT_SYMBOL(compat_sock_get_timestampns); 505 506 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 507 char __user *, optval, int __user *, optlen) 508 { 509 int err; 510 struct socket *sock = sockfd_lookup(fd, &err); 511 512 if (sock) { 513 err = security_socket_getsockopt(sock, level, optname); 514 if (err) { 515 sockfd_put(sock); 516 return err; 517 } 518 519 if (level == SOL_SOCKET) 520 err = compat_sock_getsockopt(sock, level, 521 optname, optval, optlen); 522 else if (sock->ops->compat_getsockopt) 523 err = sock->ops->compat_getsockopt(sock, level, 524 optname, optval, optlen); 525 else 526 err = sock->ops->getsockopt(sock, level, 527 optname, optval, optlen); 528 sockfd_put(sock); 529 } 530 return err; 531 } 532 533 struct compat_group_req { 534 __u32 gr_interface; 535 struct __kernel_sockaddr_storage gr_group 536 __aligned(4); 537 } __packed; 538 539 struct compat_group_source_req { 540 __u32 gsr_interface; 541 struct __kernel_sockaddr_storage gsr_group 542 __aligned(4); 543 struct __kernel_sockaddr_storage gsr_source 544 __aligned(4); 545 } __packed; 546 547 struct compat_group_filter { 548 __u32 gf_interface; 549 struct __kernel_sockaddr_storage gf_group 550 __aligned(4); 551 __u32 gf_fmode; 552 __u32 gf_numsrc; 553 struct __kernel_sockaddr_storage gf_slist[1] 554 __aligned(4); 555 } __packed; 556 557 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 558 sizeof(struct __kernel_sockaddr_storage)) 559 560 561 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 562 char __user *optval, unsigned int optlen, 563 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 564 { 565 char __user *koptval = optval; 566 int koptlen = optlen; 567 568 switch (optname) { 569 case MCAST_JOIN_GROUP: 570 case MCAST_LEAVE_GROUP: 571 { 572 struct compat_group_req __user *gr32 = (void *)optval; 573 struct group_req __user *kgr = 574 compat_alloc_user_space(sizeof(struct group_req)); 575 u32 interface; 576 577 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 578 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 579 __get_user(interface, &gr32->gr_interface) || 580 __put_user(interface, &kgr->gr_interface) || 581 copy_in_user(&kgr->gr_group, &gr32->gr_group, 582 sizeof(kgr->gr_group))) 583 return -EFAULT; 584 koptval = (char __user *)kgr; 585 koptlen = sizeof(struct group_req); 586 break; 587 } 588 case MCAST_JOIN_SOURCE_GROUP: 589 case MCAST_LEAVE_SOURCE_GROUP: 590 case MCAST_BLOCK_SOURCE: 591 case MCAST_UNBLOCK_SOURCE: 592 { 593 struct compat_group_source_req __user *gsr32 = (void *)optval; 594 struct group_source_req __user *kgsr = compat_alloc_user_space( 595 sizeof(struct group_source_req)); 596 u32 interface; 597 598 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 599 !access_ok(VERIFY_WRITE, kgsr, 600 sizeof(struct group_source_req)) || 601 __get_user(interface, &gsr32->gsr_interface) || 602 __put_user(interface, &kgsr->gsr_interface) || 603 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 604 sizeof(kgsr->gsr_group)) || 605 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 606 sizeof(kgsr->gsr_source))) 607 return -EFAULT; 608 koptval = (char __user *)kgsr; 609 koptlen = sizeof(struct group_source_req); 610 break; 611 } 612 case MCAST_MSFILTER: 613 { 614 struct compat_group_filter __user *gf32 = (void *)optval; 615 struct group_filter __user *kgf; 616 u32 interface, fmode, numsrc; 617 618 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 619 __get_user(interface, &gf32->gf_interface) || 620 __get_user(fmode, &gf32->gf_fmode) || 621 __get_user(numsrc, &gf32->gf_numsrc)) 622 return -EFAULT; 623 koptlen = optlen + sizeof(struct group_filter) - 624 sizeof(struct compat_group_filter); 625 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 626 return -EINVAL; 627 kgf = compat_alloc_user_space(koptlen); 628 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 629 __put_user(interface, &kgf->gf_interface) || 630 __put_user(fmode, &kgf->gf_fmode) || 631 __put_user(numsrc, &kgf->gf_numsrc) || 632 copy_in_user(&kgf->gf_group, &gf32->gf_group, 633 sizeof(kgf->gf_group)) || 634 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 635 numsrc * sizeof(kgf->gf_slist[0])))) 636 return -EFAULT; 637 koptval = (char __user *)kgf; 638 break; 639 } 640 641 default: 642 break; 643 } 644 return setsockopt(sock, level, optname, koptval, koptlen); 645 } 646 EXPORT_SYMBOL(compat_mc_setsockopt); 647 648 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 649 char __user *optval, int __user *optlen, 650 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 651 { 652 struct compat_group_filter __user *gf32 = (void *)optval; 653 struct group_filter __user *kgf; 654 int __user *koptlen; 655 u32 interface, fmode, numsrc; 656 int klen, ulen, err; 657 658 if (optname != MCAST_MSFILTER) 659 return getsockopt(sock, level, optname, optval, optlen); 660 661 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 662 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 663 __get_user(ulen, optlen)) 664 return -EFAULT; 665 666 /* adjust len for pad */ 667 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 668 669 if (klen < GROUP_FILTER_SIZE(0)) 670 return -EINVAL; 671 672 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 673 __put_user(klen, koptlen)) 674 return -EFAULT; 675 676 /* have to allow space for previous compat_alloc_user_space, too */ 677 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 678 679 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 680 __get_user(interface, &gf32->gf_interface) || 681 __get_user(fmode, &gf32->gf_fmode) || 682 __get_user(numsrc, &gf32->gf_numsrc) || 683 __put_user(interface, &kgf->gf_interface) || 684 __put_user(fmode, &kgf->gf_fmode) || 685 __put_user(numsrc, &kgf->gf_numsrc) || 686 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 687 return -EFAULT; 688 689 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 690 if (err) 691 return err; 692 693 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 694 __get_user(klen, koptlen)) 695 return -EFAULT; 696 697 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 698 699 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 700 __put_user(ulen, optlen)) 701 return -EFAULT; 702 703 if (!access_ok(VERIFY_READ, kgf, klen) || 704 !access_ok(VERIFY_WRITE, gf32, ulen) || 705 __get_user(interface, &kgf->gf_interface) || 706 __get_user(fmode, &kgf->gf_fmode) || 707 __get_user(numsrc, &kgf->gf_numsrc) || 708 __put_user(interface, &gf32->gf_interface) || 709 __put_user(fmode, &gf32->gf_fmode) || 710 __put_user(numsrc, &gf32->gf_numsrc)) 711 return -EFAULT; 712 if (numsrc) { 713 int copylen; 714 715 klen -= GROUP_FILTER_SIZE(0); 716 copylen = numsrc * sizeof(gf32->gf_slist[0]); 717 if (copylen > klen) 718 copylen = klen; 719 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 720 return -EFAULT; 721 } 722 return err; 723 } 724 EXPORT_SYMBOL(compat_mc_getsockopt); 725 726 727 /* Argument list sizes for compat_sys_socketcall */ 728 #define AL(x) ((x) * sizeof(u32)) 729 static unsigned char nas[21] = { 730 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 731 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 732 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 733 AL(4), AL(5), AL(4) 734 }; 735 #undef AL 736 737 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 738 { 739 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 740 } 741 742 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 743 unsigned int, vlen, unsigned int, flags) 744 { 745 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 746 flags | MSG_CMSG_COMPAT); 747 } 748 749 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 750 { 751 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 752 } 753 754 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 755 { 756 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 757 } 758 759 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 760 unsigned int, flags, struct sockaddr __user *, addr, 761 int __user *, addrlen) 762 { 763 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 764 } 765 766 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 767 unsigned int, vlen, unsigned int, flags, 768 struct compat_timespec __user *, timeout) 769 { 770 int datagrams; 771 struct timespec ktspec; 772 773 if (timeout == NULL) 774 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 775 flags | MSG_CMSG_COMPAT, NULL); 776 777 if (compat_get_timespec(&ktspec, timeout)) 778 return -EFAULT; 779 780 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 781 flags | MSG_CMSG_COMPAT, &ktspec); 782 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 783 datagrams = -EFAULT; 784 785 return datagrams; 786 } 787 788 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 789 { 790 u32 a[AUDITSC_ARGS]; 791 unsigned int len; 792 u32 a0, a1; 793 int ret; 794 795 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 796 return -EINVAL; 797 len = nas[call]; 798 if (len > sizeof(a)) 799 return -EINVAL; 800 801 if (copy_from_user(a, args, len)) 802 return -EFAULT; 803 804 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 805 if (ret) 806 return ret; 807 808 a0 = a[0]; 809 a1 = a[1]; 810 811 switch (call) { 812 case SYS_SOCKET: 813 ret = sys_socket(a0, a1, a[2]); 814 break; 815 case SYS_BIND: 816 ret = sys_bind(a0, compat_ptr(a1), a[2]); 817 break; 818 case SYS_CONNECT: 819 ret = sys_connect(a0, compat_ptr(a1), a[2]); 820 break; 821 case SYS_LISTEN: 822 ret = sys_listen(a0, a1); 823 break; 824 case SYS_ACCEPT: 825 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 826 break; 827 case SYS_GETSOCKNAME: 828 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 829 break; 830 case SYS_GETPEERNAME: 831 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 832 break; 833 case SYS_SOCKETPAIR: 834 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 835 break; 836 case SYS_SEND: 837 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 838 break; 839 case SYS_SENDTO: 840 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 841 break; 842 case SYS_RECV: 843 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 844 break; 845 case SYS_RECVFROM: 846 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 847 compat_ptr(a[4]), compat_ptr(a[5])); 848 break; 849 case SYS_SHUTDOWN: 850 ret = sys_shutdown(a0, a1); 851 break; 852 case SYS_SETSOCKOPT: 853 ret = compat_sys_setsockopt(a0, a1, a[2], 854 compat_ptr(a[3]), a[4]); 855 break; 856 case SYS_GETSOCKOPT: 857 ret = compat_sys_getsockopt(a0, a1, a[2], 858 compat_ptr(a[3]), compat_ptr(a[4])); 859 break; 860 case SYS_SENDMSG: 861 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 862 break; 863 case SYS_SENDMMSG: 864 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 865 break; 866 case SYS_RECVMSG: 867 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 868 break; 869 case SYS_RECVMMSG: 870 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 871 compat_ptr(a[4])); 872 break; 873 case SYS_ACCEPT4: 874 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 875 break; 876 default: 877 ret = -EINVAL; 878 break; 879 } 880 return ret; 881 } 882