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 <linux/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) + sizeof(struct compat_cmsghdr))) 94 #define CMSG_COMPAT_SPACE(len) \ 95 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) 96 #define CMSG_COMPAT_LEN(len) \ 97 (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 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != 134 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); 135 136 kcmlen = 0; 137 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 138 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 139 while (ucmsg != NULL) { 140 if (get_user(ucmlen, &ucmsg->cmsg_len)) 141 return -EFAULT; 142 143 /* Catch bogons. */ 144 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 145 return -EINVAL; 146 147 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 148 tmp = CMSG_ALIGN(tmp); 149 kcmlen += tmp; 150 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 151 } 152 if (kcmlen == 0) 153 return -EINVAL; 154 155 /* The kcmlen holds the 64-bit version of the control length. 156 * It may not be modified as we do not stick it into the kmsg 157 * until we have successfully copied over all of the data 158 * from the user. 159 */ 160 if (kcmlen > stackbuf_size) 161 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 162 if (kcmsg == NULL) 163 return -ENOBUFS; 164 165 /* Now copy them over neatly. */ 166 memset(kcmsg, 0, kcmlen); 167 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 168 while (ucmsg != NULL) { 169 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 170 goto Efault; 171 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 172 goto Einval; 173 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 174 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 175 goto Einval; 176 kcmsg->cmsg_len = tmp; 177 tmp = CMSG_ALIGN(tmp); 178 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 179 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 180 copy_from_user(CMSG_DATA(kcmsg), 181 CMSG_COMPAT_DATA(ucmsg), 182 (ucmlen - sizeof(*ucmsg)))) 183 goto Efault; 184 185 /* Advance. */ 186 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 187 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 188 } 189 190 /* Ok, looks like we made it. Hook it up and return success. */ 191 kmsg->msg_control = kcmsg_base; 192 kmsg->msg_controllen = kcmlen; 193 return 0; 194 195 Einval: 196 err = -EINVAL; 197 Efault: 198 if (kcmsg_base != (struct cmsghdr *)stackbuf) 199 sock_kfree_s(sk, kcmsg_base, kcmlen); 200 return err; 201 } 202 203 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 204 { 205 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 206 struct compat_cmsghdr cmhdr; 207 struct compat_timeval ctv; 208 struct compat_timespec cts[3]; 209 int cmlen; 210 211 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 212 kmsg->msg_flags |= MSG_CTRUNC; 213 return 0; /* XXX: return error? check spec. */ 214 } 215 216 if (!COMPAT_USE_64BIT_TIME) { 217 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 218 struct timeval *tv = (struct timeval *)data; 219 ctv.tv_sec = tv->tv_sec; 220 ctv.tv_usec = tv->tv_usec; 221 data = &ctv; 222 len = sizeof(ctv); 223 } 224 if (level == SOL_SOCKET && 225 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 226 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 227 int i; 228 struct timespec *ts = (struct timespec *)data; 229 for (i = 0; i < count; i++) { 230 cts[i].tv_sec = ts[i].tv_sec; 231 cts[i].tv_nsec = ts[i].tv_nsec; 232 } 233 data = &cts; 234 len = sizeof(cts[0]) * count; 235 } 236 } 237 238 cmlen = CMSG_COMPAT_LEN(len); 239 if (kmsg->msg_controllen < cmlen) { 240 kmsg->msg_flags |= MSG_CTRUNC; 241 cmlen = kmsg->msg_controllen; 242 } 243 cmhdr.cmsg_level = level; 244 cmhdr.cmsg_type = type; 245 cmhdr.cmsg_len = cmlen; 246 247 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 248 return -EFAULT; 249 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 250 return -EFAULT; 251 cmlen = CMSG_COMPAT_SPACE(len); 252 if (kmsg->msg_controllen < cmlen) 253 cmlen = kmsg->msg_controllen; 254 kmsg->msg_control += cmlen; 255 kmsg->msg_controllen -= cmlen; 256 return 0; 257 } 258 259 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 260 { 261 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 262 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 263 int fdnum = scm->fp->count; 264 struct file **fp = scm->fp->fp; 265 int __user *cmfptr; 266 int err = 0, i; 267 268 if (fdnum < fdmax) 269 fdmax = fdnum; 270 271 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 272 int new_fd; 273 err = security_file_receive(fp[i]); 274 if (err) 275 break; 276 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 277 ? O_CLOEXEC : 0); 278 if (err < 0) 279 break; 280 new_fd = err; 281 err = put_user(new_fd, cmfptr); 282 if (err) { 283 put_unused_fd(new_fd); 284 break; 285 } 286 /* Bump the usage count and install the file. */ 287 fd_install(new_fd, get_file(fp[i])); 288 } 289 290 if (i > 0) { 291 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 292 err = put_user(SOL_SOCKET, &cm->cmsg_level); 293 if (!err) 294 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 295 if (!err) 296 err = put_user(cmlen, &cm->cmsg_len); 297 if (!err) { 298 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 299 kmsg->msg_control += cmlen; 300 kmsg->msg_controllen -= cmlen; 301 } 302 } 303 if (i < fdnum) 304 kmsg->msg_flags |= MSG_CTRUNC; 305 306 /* 307 * All of the files that fit in the message have had their 308 * usage counts incremented, so we just free the list. 309 */ 310 __scm_destroy(scm); 311 } 312 313 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 314 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 315 { 316 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 317 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 318 compat_uptr_t ptr; 319 u16 len; 320 321 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 322 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 323 __get_user(len, &fprog32->len) || 324 __get_user(ptr, &fprog32->filter) || 325 __put_user(len, &kfprog->len) || 326 __put_user(compat_ptr(ptr), &kfprog->filter)) 327 return NULL; 328 329 return kfprog; 330 } 331 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 332 333 static int do_set_attach_filter(struct socket *sock, int level, int optname, 334 char __user *optval, unsigned int optlen) 335 { 336 struct sock_fprog __user *kfprog; 337 338 kfprog = get_compat_bpf_fprog(optval); 339 if (!kfprog) 340 return -EFAULT; 341 342 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 343 sizeof(struct sock_fprog)); 344 } 345 346 static int do_set_sock_timeout(struct socket *sock, int level, 347 int optname, char __user *optval, unsigned int optlen) 348 { 349 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 350 struct timeval ktime; 351 mm_segment_t old_fs; 352 int err; 353 354 if (optlen < sizeof(*up)) 355 return -EINVAL; 356 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 357 __get_user(ktime.tv_sec, &up->tv_sec) || 358 __get_user(ktime.tv_usec, &up->tv_usec)) 359 return -EFAULT; 360 old_fs = get_fs(); 361 set_fs(KERNEL_DS); 362 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 363 set_fs(old_fs); 364 365 return err; 366 } 367 368 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 369 char __user *optval, unsigned int optlen) 370 { 371 if (optname == SO_ATTACH_FILTER || 372 optname == SO_ATTACH_REUSEPORT_CBPF) 373 return do_set_attach_filter(sock, level, optname, 374 optval, optlen); 375 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 376 return do_set_sock_timeout(sock, level, optname, optval, optlen); 377 378 return sock_setsockopt(sock, level, optname, optval, optlen); 379 } 380 381 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 382 char __user *, optval, unsigned int, optlen) 383 { 384 int err; 385 struct socket *sock = sockfd_lookup(fd, &err); 386 387 if (sock) { 388 err = security_socket_setsockopt(sock, level, optname); 389 if (err) { 390 sockfd_put(sock); 391 return err; 392 } 393 394 if (level == SOL_SOCKET) 395 err = compat_sock_setsockopt(sock, level, 396 optname, optval, optlen); 397 else if (sock->ops->compat_setsockopt) 398 err = sock->ops->compat_setsockopt(sock, level, 399 optname, optval, optlen); 400 else 401 err = sock->ops->setsockopt(sock, level, 402 optname, optval, optlen); 403 sockfd_put(sock); 404 } 405 return err; 406 } 407 408 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 409 char __user *optval, int __user *optlen) 410 { 411 struct compat_timeval __user *up; 412 struct timeval ktime; 413 mm_segment_t old_fs; 414 int len, err; 415 416 up = (struct compat_timeval __user *) optval; 417 if (get_user(len, optlen)) 418 return -EFAULT; 419 if (len < sizeof(*up)) 420 return -EINVAL; 421 len = sizeof(ktime); 422 old_fs = get_fs(); 423 set_fs(KERNEL_DS); 424 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 425 set_fs(old_fs); 426 427 if (!err) { 428 if (put_user(sizeof(*up), optlen) || 429 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 430 __put_user(ktime.tv_sec, &up->tv_sec) || 431 __put_user(ktime.tv_usec, &up->tv_usec)) 432 err = -EFAULT; 433 } 434 return err; 435 } 436 437 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 438 char __user *optval, int __user *optlen) 439 { 440 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 441 return do_get_sock_timeout(sock, level, optname, optval, optlen); 442 return sock_getsockopt(sock, level, optname, optval, optlen); 443 } 444 445 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 446 { 447 struct compat_timeval __user *ctv; 448 int err; 449 struct timeval tv; 450 451 if (COMPAT_USE_64BIT_TIME) 452 return sock_get_timestamp(sk, userstamp); 453 454 ctv = (struct compat_timeval __user *) userstamp; 455 err = -ENOENT; 456 if (!sock_flag(sk, SOCK_TIMESTAMP)) 457 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 458 tv = ktime_to_timeval(sk->sk_stamp); 459 if (tv.tv_sec == -1) 460 return err; 461 if (tv.tv_sec == 0) { 462 sk->sk_stamp = ktime_get_real(); 463 tv = ktime_to_timeval(sk->sk_stamp); 464 } 465 err = 0; 466 if (put_user(tv.tv_sec, &ctv->tv_sec) || 467 put_user(tv.tv_usec, &ctv->tv_usec)) 468 err = -EFAULT; 469 return err; 470 } 471 EXPORT_SYMBOL(compat_sock_get_timestamp); 472 473 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 474 { 475 struct compat_timespec __user *ctv; 476 int err; 477 struct timespec ts; 478 479 if (COMPAT_USE_64BIT_TIME) 480 return sock_get_timestampns (sk, userstamp); 481 482 ctv = (struct compat_timespec __user *) userstamp; 483 err = -ENOENT; 484 if (!sock_flag(sk, SOCK_TIMESTAMP)) 485 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 486 ts = ktime_to_timespec(sk->sk_stamp); 487 if (ts.tv_sec == -1) 488 return err; 489 if (ts.tv_sec == 0) { 490 sk->sk_stamp = ktime_get_real(); 491 ts = ktime_to_timespec(sk->sk_stamp); 492 } 493 err = 0; 494 if (put_user(ts.tv_sec, &ctv->tv_sec) || 495 put_user(ts.tv_nsec, &ctv->tv_nsec)) 496 err = -EFAULT; 497 return err; 498 } 499 EXPORT_SYMBOL(compat_sock_get_timestampns); 500 501 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 502 char __user *, optval, int __user *, optlen) 503 { 504 int err; 505 struct socket *sock = sockfd_lookup(fd, &err); 506 507 if (sock) { 508 err = security_socket_getsockopt(sock, level, optname); 509 if (err) { 510 sockfd_put(sock); 511 return err; 512 } 513 514 if (level == SOL_SOCKET) 515 err = compat_sock_getsockopt(sock, level, 516 optname, optval, optlen); 517 else if (sock->ops->compat_getsockopt) 518 err = sock->ops->compat_getsockopt(sock, level, 519 optname, optval, optlen); 520 else 521 err = sock->ops->getsockopt(sock, level, 522 optname, optval, optlen); 523 sockfd_put(sock); 524 } 525 return err; 526 } 527 528 struct compat_group_req { 529 __u32 gr_interface; 530 struct __kernel_sockaddr_storage gr_group 531 __aligned(4); 532 } __packed; 533 534 struct compat_group_source_req { 535 __u32 gsr_interface; 536 struct __kernel_sockaddr_storage gsr_group 537 __aligned(4); 538 struct __kernel_sockaddr_storage gsr_source 539 __aligned(4); 540 } __packed; 541 542 struct compat_group_filter { 543 __u32 gf_interface; 544 struct __kernel_sockaddr_storage gf_group 545 __aligned(4); 546 __u32 gf_fmode; 547 __u32 gf_numsrc; 548 struct __kernel_sockaddr_storage gf_slist[1] 549 __aligned(4); 550 } __packed; 551 552 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 553 sizeof(struct __kernel_sockaddr_storage)) 554 555 556 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 557 char __user *optval, unsigned int optlen, 558 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 559 { 560 char __user *koptval = optval; 561 int koptlen = optlen; 562 563 switch (optname) { 564 case MCAST_JOIN_GROUP: 565 case MCAST_LEAVE_GROUP: 566 { 567 struct compat_group_req __user *gr32 = (void *)optval; 568 struct group_req __user *kgr = 569 compat_alloc_user_space(sizeof(struct group_req)); 570 u32 interface; 571 572 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 573 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 574 __get_user(interface, &gr32->gr_interface) || 575 __put_user(interface, &kgr->gr_interface) || 576 copy_in_user(&kgr->gr_group, &gr32->gr_group, 577 sizeof(kgr->gr_group))) 578 return -EFAULT; 579 koptval = (char __user *)kgr; 580 koptlen = sizeof(struct group_req); 581 break; 582 } 583 case MCAST_JOIN_SOURCE_GROUP: 584 case MCAST_LEAVE_SOURCE_GROUP: 585 case MCAST_BLOCK_SOURCE: 586 case MCAST_UNBLOCK_SOURCE: 587 { 588 struct compat_group_source_req __user *gsr32 = (void *)optval; 589 struct group_source_req __user *kgsr = compat_alloc_user_space( 590 sizeof(struct group_source_req)); 591 u32 interface; 592 593 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 594 !access_ok(VERIFY_WRITE, kgsr, 595 sizeof(struct group_source_req)) || 596 __get_user(interface, &gsr32->gsr_interface) || 597 __put_user(interface, &kgsr->gsr_interface) || 598 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 599 sizeof(kgsr->gsr_group)) || 600 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 601 sizeof(kgsr->gsr_source))) 602 return -EFAULT; 603 koptval = (char __user *)kgsr; 604 koptlen = sizeof(struct group_source_req); 605 break; 606 } 607 case MCAST_MSFILTER: 608 { 609 struct compat_group_filter __user *gf32 = (void *)optval; 610 struct group_filter __user *kgf; 611 u32 interface, fmode, numsrc; 612 613 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 614 __get_user(interface, &gf32->gf_interface) || 615 __get_user(fmode, &gf32->gf_fmode) || 616 __get_user(numsrc, &gf32->gf_numsrc)) 617 return -EFAULT; 618 koptlen = optlen + sizeof(struct group_filter) - 619 sizeof(struct compat_group_filter); 620 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 621 return -EINVAL; 622 kgf = compat_alloc_user_space(koptlen); 623 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 624 __put_user(interface, &kgf->gf_interface) || 625 __put_user(fmode, &kgf->gf_fmode) || 626 __put_user(numsrc, &kgf->gf_numsrc) || 627 copy_in_user(&kgf->gf_group, &gf32->gf_group, 628 sizeof(kgf->gf_group)) || 629 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 630 numsrc * sizeof(kgf->gf_slist[0])))) 631 return -EFAULT; 632 koptval = (char __user *)kgf; 633 break; 634 } 635 636 default: 637 break; 638 } 639 return setsockopt(sock, level, optname, koptval, koptlen); 640 } 641 EXPORT_SYMBOL(compat_mc_setsockopt); 642 643 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 644 char __user *optval, int __user *optlen, 645 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 646 { 647 struct compat_group_filter __user *gf32 = (void *)optval; 648 struct group_filter __user *kgf; 649 int __user *koptlen; 650 u32 interface, fmode, numsrc; 651 int klen, ulen, err; 652 653 if (optname != MCAST_MSFILTER) 654 return getsockopt(sock, level, optname, optval, optlen); 655 656 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 657 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 658 __get_user(ulen, optlen)) 659 return -EFAULT; 660 661 /* adjust len for pad */ 662 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 663 664 if (klen < GROUP_FILTER_SIZE(0)) 665 return -EINVAL; 666 667 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 668 __put_user(klen, koptlen)) 669 return -EFAULT; 670 671 /* have to allow space for previous compat_alloc_user_space, too */ 672 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 673 674 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 675 __get_user(interface, &gf32->gf_interface) || 676 __get_user(fmode, &gf32->gf_fmode) || 677 __get_user(numsrc, &gf32->gf_numsrc) || 678 __put_user(interface, &kgf->gf_interface) || 679 __put_user(fmode, &kgf->gf_fmode) || 680 __put_user(numsrc, &kgf->gf_numsrc) || 681 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 682 return -EFAULT; 683 684 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 685 if (err) 686 return err; 687 688 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 689 __get_user(klen, koptlen)) 690 return -EFAULT; 691 692 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 693 694 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 695 __put_user(ulen, optlen)) 696 return -EFAULT; 697 698 if (!access_ok(VERIFY_READ, kgf, klen) || 699 !access_ok(VERIFY_WRITE, gf32, ulen) || 700 __get_user(interface, &kgf->gf_interface) || 701 __get_user(fmode, &kgf->gf_fmode) || 702 __get_user(numsrc, &kgf->gf_numsrc) || 703 __put_user(interface, &gf32->gf_interface) || 704 __put_user(fmode, &gf32->gf_fmode) || 705 __put_user(numsrc, &gf32->gf_numsrc)) 706 return -EFAULT; 707 if (numsrc) { 708 int copylen; 709 710 klen -= GROUP_FILTER_SIZE(0); 711 copylen = numsrc * sizeof(gf32->gf_slist[0]); 712 if (copylen > klen) 713 copylen = klen; 714 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 715 return -EFAULT; 716 } 717 return err; 718 } 719 EXPORT_SYMBOL(compat_mc_getsockopt); 720 721 722 /* Argument list sizes for compat_sys_socketcall */ 723 #define AL(x) ((x) * sizeof(u32)) 724 static unsigned char nas[21] = { 725 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 726 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 727 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 728 AL(4), AL(5), AL(4) 729 }; 730 #undef AL 731 732 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 733 { 734 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 735 } 736 737 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 738 unsigned int, vlen, unsigned int, flags) 739 { 740 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 741 flags | MSG_CMSG_COMPAT); 742 } 743 744 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 745 { 746 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 747 } 748 749 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 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, 755 unsigned int, flags, struct sockaddr __user *, addr, 756 int __user *, addrlen) 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, 762 unsigned int, vlen, unsigned int, flags, 763 struct compat_timespec __user *, timeout) 764 { 765 int datagrams; 766 struct timespec ktspec; 767 768 if (timeout == NULL) 769 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 770 flags | MSG_CMSG_COMPAT, NULL); 771 772 if (compat_get_timespec(&ktspec, timeout)) 773 return -EFAULT; 774 775 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 776 flags | MSG_CMSG_COMPAT, &ktspec); 777 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 778 datagrams = -EFAULT; 779 780 return datagrams; 781 } 782 783 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 784 { 785 int ret; 786 u32 a[6]; 787 u32 a0, a1; 788 789 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 790 return -EINVAL; 791 if (copy_from_user(a, args, nas[call])) 792 return -EFAULT; 793 a0 = a[0]; 794 a1 = a[1]; 795 796 switch (call) { 797 case SYS_SOCKET: 798 ret = sys_socket(a0, a1, a[2]); 799 break; 800 case SYS_BIND: 801 ret = sys_bind(a0, compat_ptr(a1), a[2]); 802 break; 803 case SYS_CONNECT: 804 ret = sys_connect(a0, compat_ptr(a1), a[2]); 805 break; 806 case SYS_LISTEN: 807 ret = sys_listen(a0, a1); 808 break; 809 case SYS_ACCEPT: 810 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 811 break; 812 case SYS_GETSOCKNAME: 813 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 814 break; 815 case SYS_GETPEERNAME: 816 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 817 break; 818 case SYS_SOCKETPAIR: 819 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 820 break; 821 case SYS_SEND: 822 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 823 break; 824 case SYS_SENDTO: 825 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 826 break; 827 case SYS_RECV: 828 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 829 break; 830 case SYS_RECVFROM: 831 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 832 compat_ptr(a[4]), compat_ptr(a[5])); 833 break; 834 case SYS_SHUTDOWN: 835 ret = sys_shutdown(a0, a1); 836 break; 837 case SYS_SETSOCKOPT: 838 ret = compat_sys_setsockopt(a0, a1, a[2], 839 compat_ptr(a[3]), a[4]); 840 break; 841 case SYS_GETSOCKOPT: 842 ret = compat_sys_getsockopt(a0, a1, a[2], 843 compat_ptr(a[3]), compat_ptr(a[4])); 844 break; 845 case SYS_SENDMSG: 846 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 847 break; 848 case SYS_SENDMMSG: 849 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 850 break; 851 case SYS_RECVMSG: 852 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 853 break; 854 case SYS_RECVMMSG: 855 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 856 compat_ptr(a[4])); 857 break; 858 case SYS_ACCEPT4: 859 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 860 break; 861 default: 862 ret = -EINVAL; 863 break; 864 } 865 return ret; 866 } 867