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/export.h> 26 27 #include <net/scm.h> 28 #include <net/sock.h> 29 #include <net/ip.h> 30 #include <net/ipv6.h> 31 #include <asm/uaccess.h> 32 #include <net/compat.h> 33 34 int get_compat_msghdr(struct msghdr *kmsg, 35 struct compat_msghdr __user *umsg, 36 struct sockaddr __user **save_addr, 37 struct iovec **iov) 38 { 39 compat_uptr_t uaddr, uiov, tmp3; 40 compat_size_t nr_segs; 41 ssize_t err; 42 43 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 44 __get_user(uaddr, &umsg->msg_name) || 45 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 46 __get_user(uiov, &umsg->msg_iov) || 47 __get_user(nr_segs, &umsg->msg_iovlen) || 48 __get_user(tmp3, &umsg->msg_control) || 49 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 50 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 51 return -EFAULT; 52 53 if (!uaddr) 54 kmsg->msg_namelen = 0; 55 56 if (kmsg->msg_namelen < 0) 57 return -EINVAL; 58 59 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 60 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 61 kmsg->msg_control = compat_ptr(tmp3); 62 63 if (save_addr) 64 *save_addr = compat_ptr(uaddr); 65 66 if (uaddr && kmsg->msg_namelen) { 67 if (!save_addr) { 68 err = move_addr_to_kernel(compat_ptr(uaddr), 69 kmsg->msg_namelen, 70 kmsg->msg_name); 71 if (err < 0) 72 return err; 73 } 74 } else { 75 kmsg->msg_name = NULL; 76 kmsg->msg_namelen = 0; 77 } 78 79 if (nr_segs > UIO_MAXIOV) 80 return -EMSGSIZE; 81 82 kmsg->msg_iocb = NULL; 83 84 return compat_import_iovec(save_addr ? READ : WRITE, 85 compat_ptr(uiov), nr_segs, 86 UIO_FASTIOV, iov, &kmsg->msg_iter); 87 } 88 89 /* Bleech... */ 90 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 91 92 #define CMSG_COMPAT_DATA(cmsg) \ 93 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 94 #define CMSG_COMPAT_SPACE(len) \ 95 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 96 #define CMSG_COMPAT_LEN(len) \ 97 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 98 99 #define CMSG_COMPAT_FIRSTHDR(msg) \ 100 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 101 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 102 (struct compat_cmsghdr __user *)NULL) 103 104 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 105 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 106 (ucmlen) <= (unsigned long) \ 107 ((mhdr)->msg_controllen - \ 108 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 109 110 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 111 struct compat_cmsghdr __user *cmsg, int cmsg_len) 112 { 113 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 114 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 115 msg->msg_controllen) 116 return NULL; 117 return (struct compat_cmsghdr __user *)ptr; 118 } 119 120 /* There is a lot of hair here because the alignment rules (and 121 * thus placement) of cmsg headers and length are different for 122 * 32-bit apps. -DaveM 123 */ 124 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 125 unsigned char *stackbuf, int stackbuf_size) 126 { 127 struct compat_cmsghdr __user *ucmsg; 128 struct cmsghdr *kcmsg, *kcmsg_base; 129 compat_size_t ucmlen; 130 __kernel_size_t kcmlen, tmp; 131 int err = -EFAULT; 132 133 kcmlen = 0; 134 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 135 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 136 while (ucmsg != NULL) { 137 if (get_user(ucmlen, &ucmsg->cmsg_len)) 138 return -EFAULT; 139 140 /* Catch bogons. */ 141 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 142 return -EINVAL; 143 144 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 145 CMSG_ALIGN(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 - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 172 CMSG_ALIGN(sizeof(struct cmsghdr))); 173 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 174 goto Einval; 175 kcmsg->cmsg_len = tmp; 176 tmp = CMSG_ALIGN(tmp); 177 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 178 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 179 copy_from_user(CMSG_DATA(kcmsg), 180 CMSG_COMPAT_DATA(ucmsg), 181 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 182 goto Efault; 183 184 /* Advance. */ 185 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 186 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 187 } 188 189 /* Ok, looks like we made it. Hook it up and return success. */ 190 kmsg->msg_control = kcmsg_base; 191 kmsg->msg_controllen = kcmlen; 192 return 0; 193 194 Einval: 195 err = -EINVAL; 196 Efault: 197 if (kcmsg_base != (struct cmsghdr *)stackbuf) 198 sock_kfree_s(sk, kcmsg_base, kcmlen); 199 return err; 200 } 201 202 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 203 { 204 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 205 struct compat_cmsghdr cmhdr; 206 struct compat_timeval ctv; 207 struct compat_timespec cts[3]; 208 int cmlen; 209 210 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 211 kmsg->msg_flags |= MSG_CTRUNC; 212 return 0; /* XXX: return error? check spec. */ 213 } 214 215 if (!COMPAT_USE_64BIT_TIME) { 216 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 217 struct timeval *tv = (struct timeval *)data; 218 ctv.tv_sec = tv->tv_sec; 219 ctv.tv_usec = tv->tv_usec; 220 data = &ctv; 221 len = sizeof(ctv); 222 } 223 if (level == SOL_SOCKET && 224 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 225 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 226 int i; 227 struct timespec *ts = (struct timespec *)data; 228 for (i = 0; i < count; i++) { 229 cts[i].tv_sec = ts[i].tv_sec; 230 cts[i].tv_nsec = ts[i].tv_nsec; 231 } 232 data = &cts; 233 len = sizeof(cts[0]) * count; 234 } 235 } 236 237 cmlen = CMSG_COMPAT_LEN(len); 238 if (kmsg->msg_controllen < cmlen) { 239 kmsg->msg_flags |= MSG_CTRUNC; 240 cmlen = kmsg->msg_controllen; 241 } 242 cmhdr.cmsg_level = level; 243 cmhdr.cmsg_type = type; 244 cmhdr.cmsg_len = cmlen; 245 246 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 247 return -EFAULT; 248 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 249 return -EFAULT; 250 cmlen = CMSG_COMPAT_SPACE(len); 251 if (kmsg->msg_controllen < cmlen) 252 cmlen = kmsg->msg_controllen; 253 kmsg->msg_control += cmlen; 254 kmsg->msg_controllen -= cmlen; 255 return 0; 256 } 257 258 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 259 { 260 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 261 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 262 int fdnum = scm->fp->count; 263 struct file **fp = scm->fp->fp; 264 int __user *cmfptr; 265 int err = 0, i; 266 267 if (fdnum < fdmax) 268 fdmax = fdnum; 269 270 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 271 int new_fd; 272 err = security_file_receive(fp[i]); 273 if (err) 274 break; 275 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 276 ? O_CLOEXEC : 0); 277 if (err < 0) 278 break; 279 new_fd = err; 280 err = put_user(new_fd, cmfptr); 281 if (err) { 282 put_unused_fd(new_fd); 283 break; 284 } 285 /* Bump the usage count and install the file. */ 286 fd_install(new_fd, get_file(fp[i])); 287 } 288 289 if (i > 0) { 290 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 291 err = put_user(SOL_SOCKET, &cm->cmsg_level); 292 if (!err) 293 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 294 if (!err) 295 err = put_user(cmlen, &cm->cmsg_len); 296 if (!err) { 297 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 298 kmsg->msg_control += cmlen; 299 kmsg->msg_controllen -= cmlen; 300 } 301 } 302 if (i < fdnum) 303 kmsg->msg_flags |= MSG_CTRUNC; 304 305 /* 306 * All of the files that fit in the message have had their 307 * usage counts incremented, so we just free the list. 308 */ 309 __scm_destroy(scm); 310 } 311 312 static int do_set_attach_filter(struct socket *sock, int level, int optname, 313 char __user *optval, unsigned int optlen) 314 { 315 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 316 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 317 compat_uptr_t ptr; 318 u16 len; 319 320 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 321 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 322 __get_user(len, &fprog32->len) || 323 __get_user(ptr, &fprog32->filter) || 324 __put_user(len, &kfprog->len) || 325 __put_user(compat_ptr(ptr), &kfprog->filter)) 326 return -EFAULT; 327 328 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 329 sizeof(struct sock_fprog)); 330 } 331 332 static int do_set_sock_timeout(struct socket *sock, int level, 333 int optname, char __user *optval, unsigned int optlen) 334 { 335 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 336 struct timeval ktime; 337 mm_segment_t old_fs; 338 int err; 339 340 if (optlen < sizeof(*up)) 341 return -EINVAL; 342 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 343 __get_user(ktime.tv_sec, &up->tv_sec) || 344 __get_user(ktime.tv_usec, &up->tv_usec)) 345 return -EFAULT; 346 old_fs = get_fs(); 347 set_fs(KERNEL_DS); 348 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 349 set_fs(old_fs); 350 351 return err; 352 } 353 354 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 355 char __user *optval, unsigned int optlen) 356 { 357 if (optname == SO_ATTACH_FILTER) 358 return do_set_attach_filter(sock, level, optname, 359 optval, optlen); 360 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 361 return do_set_sock_timeout(sock, level, optname, optval, optlen); 362 363 return sock_setsockopt(sock, level, optname, optval, optlen); 364 } 365 366 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 367 char __user *, optval, unsigned int, optlen) 368 { 369 int err; 370 struct socket *sock = sockfd_lookup(fd, &err); 371 372 if (sock) { 373 err = security_socket_setsockopt(sock, level, optname); 374 if (err) { 375 sockfd_put(sock); 376 return err; 377 } 378 379 if (level == SOL_SOCKET) 380 err = compat_sock_setsockopt(sock, level, 381 optname, optval, optlen); 382 else if (sock->ops->compat_setsockopt) 383 err = sock->ops->compat_setsockopt(sock, level, 384 optname, optval, optlen); 385 else 386 err = sock->ops->setsockopt(sock, level, 387 optname, optval, optlen); 388 sockfd_put(sock); 389 } 390 return err; 391 } 392 393 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 394 char __user *optval, int __user *optlen) 395 { 396 struct compat_timeval __user *up; 397 struct timeval ktime; 398 mm_segment_t old_fs; 399 int len, err; 400 401 up = (struct compat_timeval __user *) optval; 402 if (get_user(len, optlen)) 403 return -EFAULT; 404 if (len < sizeof(*up)) 405 return -EINVAL; 406 len = sizeof(ktime); 407 old_fs = get_fs(); 408 set_fs(KERNEL_DS); 409 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 410 set_fs(old_fs); 411 412 if (!err) { 413 if (put_user(sizeof(*up), optlen) || 414 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 415 __put_user(ktime.tv_sec, &up->tv_sec) || 416 __put_user(ktime.tv_usec, &up->tv_usec)) 417 err = -EFAULT; 418 } 419 return err; 420 } 421 422 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 423 char __user *optval, int __user *optlen) 424 { 425 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 426 return do_get_sock_timeout(sock, level, optname, optval, optlen); 427 return sock_getsockopt(sock, level, optname, optval, optlen); 428 } 429 430 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 431 { 432 struct compat_timeval __user *ctv; 433 int err; 434 struct timeval tv; 435 436 if (COMPAT_USE_64BIT_TIME) 437 return sock_get_timestamp(sk, userstamp); 438 439 ctv = (struct compat_timeval __user *) userstamp; 440 err = -ENOENT; 441 if (!sock_flag(sk, SOCK_TIMESTAMP)) 442 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 443 tv = ktime_to_timeval(sk->sk_stamp); 444 if (tv.tv_sec == -1) 445 return err; 446 if (tv.tv_sec == 0) { 447 sk->sk_stamp = ktime_get_real(); 448 tv = ktime_to_timeval(sk->sk_stamp); 449 } 450 err = 0; 451 if (put_user(tv.tv_sec, &ctv->tv_sec) || 452 put_user(tv.tv_usec, &ctv->tv_usec)) 453 err = -EFAULT; 454 return err; 455 } 456 EXPORT_SYMBOL(compat_sock_get_timestamp); 457 458 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 459 { 460 struct compat_timespec __user *ctv; 461 int err; 462 struct timespec ts; 463 464 if (COMPAT_USE_64BIT_TIME) 465 return sock_get_timestampns (sk, userstamp); 466 467 ctv = (struct compat_timespec __user *) userstamp; 468 err = -ENOENT; 469 if (!sock_flag(sk, SOCK_TIMESTAMP)) 470 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 471 ts = ktime_to_timespec(sk->sk_stamp); 472 if (ts.tv_sec == -1) 473 return err; 474 if (ts.tv_sec == 0) { 475 sk->sk_stamp = ktime_get_real(); 476 ts = ktime_to_timespec(sk->sk_stamp); 477 } 478 err = 0; 479 if (put_user(ts.tv_sec, &ctv->tv_sec) || 480 put_user(ts.tv_nsec, &ctv->tv_nsec)) 481 err = -EFAULT; 482 return err; 483 } 484 EXPORT_SYMBOL(compat_sock_get_timestampns); 485 486 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 487 char __user *, optval, int __user *, optlen) 488 { 489 int err; 490 struct socket *sock = sockfd_lookup(fd, &err); 491 492 if (sock) { 493 err = security_socket_getsockopt(sock, level, optname); 494 if (err) { 495 sockfd_put(sock); 496 return err; 497 } 498 499 if (level == SOL_SOCKET) 500 err = compat_sock_getsockopt(sock, level, 501 optname, optval, optlen); 502 else if (sock->ops->compat_getsockopt) 503 err = sock->ops->compat_getsockopt(sock, level, 504 optname, optval, optlen); 505 else 506 err = sock->ops->getsockopt(sock, level, 507 optname, optval, optlen); 508 sockfd_put(sock); 509 } 510 return err; 511 } 512 513 struct compat_group_req { 514 __u32 gr_interface; 515 struct __kernel_sockaddr_storage gr_group 516 __aligned(4); 517 } __packed; 518 519 struct compat_group_source_req { 520 __u32 gsr_interface; 521 struct __kernel_sockaddr_storage gsr_group 522 __aligned(4); 523 struct __kernel_sockaddr_storage gsr_source 524 __aligned(4); 525 } __packed; 526 527 struct compat_group_filter { 528 __u32 gf_interface; 529 struct __kernel_sockaddr_storage gf_group 530 __aligned(4); 531 __u32 gf_fmode; 532 __u32 gf_numsrc; 533 struct __kernel_sockaddr_storage gf_slist[1] 534 __aligned(4); 535 } __packed; 536 537 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 538 sizeof(struct __kernel_sockaddr_storage)) 539 540 541 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 542 char __user *optval, unsigned int optlen, 543 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 544 { 545 char __user *koptval = optval; 546 int koptlen = optlen; 547 548 switch (optname) { 549 case MCAST_JOIN_GROUP: 550 case MCAST_LEAVE_GROUP: 551 { 552 struct compat_group_req __user *gr32 = (void *)optval; 553 struct group_req __user *kgr = 554 compat_alloc_user_space(sizeof(struct group_req)); 555 u32 interface; 556 557 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 558 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 559 __get_user(interface, &gr32->gr_interface) || 560 __put_user(interface, &kgr->gr_interface) || 561 copy_in_user(&kgr->gr_group, &gr32->gr_group, 562 sizeof(kgr->gr_group))) 563 return -EFAULT; 564 koptval = (char __user *)kgr; 565 koptlen = sizeof(struct group_req); 566 break; 567 } 568 case MCAST_JOIN_SOURCE_GROUP: 569 case MCAST_LEAVE_SOURCE_GROUP: 570 case MCAST_BLOCK_SOURCE: 571 case MCAST_UNBLOCK_SOURCE: 572 { 573 struct compat_group_source_req __user *gsr32 = (void *)optval; 574 struct group_source_req __user *kgsr = compat_alloc_user_space( 575 sizeof(struct group_source_req)); 576 u32 interface; 577 578 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 579 !access_ok(VERIFY_WRITE, kgsr, 580 sizeof(struct group_source_req)) || 581 __get_user(interface, &gsr32->gsr_interface) || 582 __put_user(interface, &kgsr->gsr_interface) || 583 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 584 sizeof(kgsr->gsr_group)) || 585 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 586 sizeof(kgsr->gsr_source))) 587 return -EFAULT; 588 koptval = (char __user *)kgsr; 589 koptlen = sizeof(struct group_source_req); 590 break; 591 } 592 case MCAST_MSFILTER: 593 { 594 struct compat_group_filter __user *gf32 = (void *)optval; 595 struct group_filter __user *kgf; 596 u32 interface, fmode, numsrc; 597 598 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 599 __get_user(interface, &gf32->gf_interface) || 600 __get_user(fmode, &gf32->gf_fmode) || 601 __get_user(numsrc, &gf32->gf_numsrc)) 602 return -EFAULT; 603 koptlen = optlen + sizeof(struct group_filter) - 604 sizeof(struct compat_group_filter); 605 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 606 return -EINVAL; 607 kgf = compat_alloc_user_space(koptlen); 608 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 609 __put_user(interface, &kgf->gf_interface) || 610 __put_user(fmode, &kgf->gf_fmode) || 611 __put_user(numsrc, &kgf->gf_numsrc) || 612 copy_in_user(&kgf->gf_group, &gf32->gf_group, 613 sizeof(kgf->gf_group)) || 614 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 615 numsrc * sizeof(kgf->gf_slist[0])))) 616 return -EFAULT; 617 koptval = (char __user *)kgf; 618 break; 619 } 620 621 default: 622 break; 623 } 624 return setsockopt(sock, level, optname, koptval, koptlen); 625 } 626 EXPORT_SYMBOL(compat_mc_setsockopt); 627 628 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 629 char __user *optval, int __user *optlen, 630 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 631 { 632 struct compat_group_filter __user *gf32 = (void *)optval; 633 struct group_filter __user *kgf; 634 int __user *koptlen; 635 u32 interface, fmode, numsrc; 636 int klen, ulen, err; 637 638 if (optname != MCAST_MSFILTER) 639 return getsockopt(sock, level, optname, optval, optlen); 640 641 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 642 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 643 __get_user(ulen, optlen)) 644 return -EFAULT; 645 646 /* adjust len for pad */ 647 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 648 649 if (klen < GROUP_FILTER_SIZE(0)) 650 return -EINVAL; 651 652 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 653 __put_user(klen, koptlen)) 654 return -EFAULT; 655 656 /* have to allow space for previous compat_alloc_user_space, too */ 657 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 658 659 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 660 __get_user(interface, &gf32->gf_interface) || 661 __get_user(fmode, &gf32->gf_fmode) || 662 __get_user(numsrc, &gf32->gf_numsrc) || 663 __put_user(interface, &kgf->gf_interface) || 664 __put_user(fmode, &kgf->gf_fmode) || 665 __put_user(numsrc, &kgf->gf_numsrc) || 666 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 667 return -EFAULT; 668 669 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 670 if (err) 671 return err; 672 673 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 674 __get_user(klen, koptlen)) 675 return -EFAULT; 676 677 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 678 679 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 680 __put_user(ulen, optlen)) 681 return -EFAULT; 682 683 if (!access_ok(VERIFY_READ, kgf, klen) || 684 !access_ok(VERIFY_WRITE, gf32, ulen) || 685 __get_user(interface, &kgf->gf_interface) || 686 __get_user(fmode, &kgf->gf_fmode) || 687 __get_user(numsrc, &kgf->gf_numsrc) || 688 __put_user(interface, &gf32->gf_interface) || 689 __put_user(fmode, &gf32->gf_fmode) || 690 __put_user(numsrc, &gf32->gf_numsrc)) 691 return -EFAULT; 692 if (numsrc) { 693 int copylen; 694 695 klen -= GROUP_FILTER_SIZE(0); 696 copylen = numsrc * sizeof(gf32->gf_slist[0]); 697 if (copylen > klen) 698 copylen = klen; 699 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 700 return -EFAULT; 701 } 702 return err; 703 } 704 EXPORT_SYMBOL(compat_mc_getsockopt); 705 706 707 /* Argument list sizes for compat_sys_socketcall */ 708 #define AL(x) ((x) * sizeof(u32)) 709 static unsigned char nas[21] = { 710 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 711 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 712 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 713 AL(4), AL(5), AL(4) 714 }; 715 #undef AL 716 717 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 718 { 719 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 720 } 721 722 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 723 unsigned int, vlen, unsigned int, flags) 724 { 725 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 726 flags | MSG_CMSG_COMPAT); 727 } 728 729 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 730 { 731 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 732 } 733 734 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 735 { 736 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 737 } 738 739 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 740 unsigned int, flags, struct sockaddr __user *, addr, 741 int __user *, addrlen) 742 { 743 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 744 } 745 746 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 747 unsigned int, vlen, unsigned int, flags, 748 struct compat_timespec __user *, timeout) 749 { 750 int datagrams; 751 struct timespec ktspec; 752 753 if (timeout == NULL) 754 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 755 flags | MSG_CMSG_COMPAT, NULL); 756 757 if (compat_get_timespec(&ktspec, timeout)) 758 return -EFAULT; 759 760 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 761 flags | MSG_CMSG_COMPAT, &ktspec); 762 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 763 datagrams = -EFAULT; 764 765 return datagrams; 766 } 767 768 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 769 { 770 int ret; 771 u32 a[6]; 772 u32 a0, a1; 773 774 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 775 return -EINVAL; 776 if (copy_from_user(a, args, nas[call])) 777 return -EFAULT; 778 a0 = a[0]; 779 a1 = a[1]; 780 781 switch (call) { 782 case SYS_SOCKET: 783 ret = sys_socket(a0, a1, a[2]); 784 break; 785 case SYS_BIND: 786 ret = sys_bind(a0, compat_ptr(a1), a[2]); 787 break; 788 case SYS_CONNECT: 789 ret = sys_connect(a0, compat_ptr(a1), a[2]); 790 break; 791 case SYS_LISTEN: 792 ret = sys_listen(a0, a1); 793 break; 794 case SYS_ACCEPT: 795 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 796 break; 797 case SYS_GETSOCKNAME: 798 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 799 break; 800 case SYS_GETPEERNAME: 801 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 802 break; 803 case SYS_SOCKETPAIR: 804 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 805 break; 806 case SYS_SEND: 807 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 808 break; 809 case SYS_SENDTO: 810 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 811 break; 812 case SYS_RECV: 813 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 814 break; 815 case SYS_RECVFROM: 816 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 817 compat_ptr(a[4]), compat_ptr(a[5])); 818 break; 819 case SYS_SHUTDOWN: 820 ret = sys_shutdown(a0, a1); 821 break; 822 case SYS_SETSOCKOPT: 823 ret = compat_sys_setsockopt(a0, a1, a[2], 824 compat_ptr(a[3]), a[4]); 825 break; 826 case SYS_GETSOCKOPT: 827 ret = compat_sys_getsockopt(a0, a1, a[2], 828 compat_ptr(a[3]), compat_ptr(a[4])); 829 break; 830 case SYS_SENDMSG: 831 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 832 break; 833 case SYS_SENDMMSG: 834 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 835 break; 836 case SYS_RECVMSG: 837 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 838 break; 839 case SYS_RECVMMSG: 840 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 841 compat_ptr(a[4])); 842 break; 843 case SYS_ACCEPT4: 844 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 845 break; 846 default: 847 ret = -EINVAL; 848 break; 849 } 850 return ret; 851 } 852