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 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 313 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 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 NULL; 327 328 return kfprog; 329 } 330 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 331 332 static int do_set_attach_filter(struct socket *sock, int level, int optname, 333 char __user *optval, unsigned int optlen) 334 { 335 struct sock_fprog __user *kfprog; 336 337 kfprog = get_compat_bpf_fprog(optval); 338 if (!kfprog) 339 return -EFAULT; 340 341 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 342 sizeof(struct sock_fprog)); 343 } 344 345 static int do_set_sock_timeout(struct socket *sock, int level, 346 int optname, char __user *optval, unsigned int optlen) 347 { 348 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 349 struct timeval ktime; 350 mm_segment_t old_fs; 351 int err; 352 353 if (optlen < sizeof(*up)) 354 return -EINVAL; 355 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 356 __get_user(ktime.tv_sec, &up->tv_sec) || 357 __get_user(ktime.tv_usec, &up->tv_usec)) 358 return -EFAULT; 359 old_fs = get_fs(); 360 set_fs(KERNEL_DS); 361 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 362 set_fs(old_fs); 363 364 return err; 365 } 366 367 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 368 char __user *optval, unsigned int optlen) 369 { 370 if (optname == SO_ATTACH_FILTER || 371 optname == SO_ATTACH_REUSEPORT_CBPF) 372 return do_set_attach_filter(sock, level, optname, 373 optval, optlen); 374 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 375 return do_set_sock_timeout(sock, level, optname, optval, optlen); 376 377 return sock_setsockopt(sock, level, optname, optval, optlen); 378 } 379 380 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 381 char __user *, optval, unsigned int, optlen) 382 { 383 int err; 384 struct socket *sock = sockfd_lookup(fd, &err); 385 386 if (sock) { 387 err = security_socket_setsockopt(sock, level, optname); 388 if (err) { 389 sockfd_put(sock); 390 return err; 391 } 392 393 if (level == SOL_SOCKET) 394 err = compat_sock_setsockopt(sock, level, 395 optname, optval, optlen); 396 else if (sock->ops->compat_setsockopt) 397 err = sock->ops->compat_setsockopt(sock, level, 398 optname, optval, optlen); 399 else 400 err = sock->ops->setsockopt(sock, level, 401 optname, optval, optlen); 402 sockfd_put(sock); 403 } 404 return err; 405 } 406 407 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 408 char __user *optval, int __user *optlen) 409 { 410 struct compat_timeval __user *up; 411 struct timeval ktime; 412 mm_segment_t old_fs; 413 int len, err; 414 415 up = (struct compat_timeval __user *) optval; 416 if (get_user(len, optlen)) 417 return -EFAULT; 418 if (len < sizeof(*up)) 419 return -EINVAL; 420 len = sizeof(ktime); 421 old_fs = get_fs(); 422 set_fs(KERNEL_DS); 423 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 424 set_fs(old_fs); 425 426 if (!err) { 427 if (put_user(sizeof(*up), optlen) || 428 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 429 __put_user(ktime.tv_sec, &up->tv_sec) || 430 __put_user(ktime.tv_usec, &up->tv_usec)) 431 err = -EFAULT; 432 } 433 return err; 434 } 435 436 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 437 char __user *optval, int __user *optlen) 438 { 439 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 440 return do_get_sock_timeout(sock, level, optname, optval, optlen); 441 return sock_getsockopt(sock, level, optname, optval, optlen); 442 } 443 444 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 445 { 446 struct compat_timeval __user *ctv; 447 int err; 448 struct timeval tv; 449 450 if (COMPAT_USE_64BIT_TIME) 451 return sock_get_timestamp(sk, userstamp); 452 453 ctv = (struct compat_timeval __user *) userstamp; 454 err = -ENOENT; 455 if (!sock_flag(sk, SOCK_TIMESTAMP)) 456 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 457 tv = ktime_to_timeval(sk->sk_stamp); 458 if (tv.tv_sec == -1) 459 return err; 460 if (tv.tv_sec == 0) { 461 sk->sk_stamp = ktime_get_real(); 462 tv = ktime_to_timeval(sk->sk_stamp); 463 } 464 err = 0; 465 if (put_user(tv.tv_sec, &ctv->tv_sec) || 466 put_user(tv.tv_usec, &ctv->tv_usec)) 467 err = -EFAULT; 468 return err; 469 } 470 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; 475 int err; 476 struct timespec ts; 477 478 if (COMPAT_USE_64BIT_TIME) 479 return sock_get_timestampns (sk, userstamp); 480 481 ctv = (struct compat_timespec __user *) userstamp; 482 err = -ENOENT; 483 if (!sock_flag(sk, SOCK_TIMESTAMP)) 484 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 485 ts = ktime_to_timespec(sk->sk_stamp); 486 if (ts.tv_sec == -1) 487 return err; 488 if (ts.tv_sec == 0) { 489 sk->sk_stamp = ktime_get_real(); 490 ts = ktime_to_timespec(sk->sk_stamp); 491 } 492 err = 0; 493 if (put_user(ts.tv_sec, &ctv->tv_sec) || 494 put_user(ts.tv_nsec, &ctv->tv_nsec)) 495 err = -EFAULT; 496 return err; 497 } 498 EXPORT_SYMBOL(compat_sock_get_timestampns); 499 500 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 501 char __user *, optval, int __user *, optlen) 502 { 503 int err; 504 struct socket *sock = sockfd_lookup(fd, &err); 505 506 if (sock) { 507 err = security_socket_getsockopt(sock, level, optname); 508 if (err) { 509 sockfd_put(sock); 510 return err; 511 } 512 513 if (level == SOL_SOCKET) 514 err = compat_sock_getsockopt(sock, level, 515 optname, optval, optlen); 516 else if (sock->ops->compat_getsockopt) 517 err = sock->ops->compat_getsockopt(sock, level, 518 optname, optval, optlen); 519 else 520 err = sock->ops->getsockopt(sock, level, 521 optname, optval, optlen); 522 sockfd_put(sock); 523 } 524 return err; 525 } 526 527 struct compat_group_req { 528 __u32 gr_interface; 529 struct __kernel_sockaddr_storage gr_group 530 __aligned(4); 531 } __packed; 532 533 struct compat_group_source_req { 534 __u32 gsr_interface; 535 struct __kernel_sockaddr_storage gsr_group 536 __aligned(4); 537 struct __kernel_sockaddr_storage gsr_source 538 __aligned(4); 539 } __packed; 540 541 struct compat_group_filter { 542 __u32 gf_interface; 543 struct __kernel_sockaddr_storage gf_group 544 __aligned(4); 545 __u32 gf_fmode; 546 __u32 gf_numsrc; 547 struct __kernel_sockaddr_storage gf_slist[1] 548 __aligned(4); 549 } __packed; 550 551 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 552 sizeof(struct __kernel_sockaddr_storage)) 553 554 555 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 556 char __user *optval, unsigned int optlen, 557 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 558 { 559 char __user *koptval = optval; 560 int koptlen = optlen; 561 562 switch (optname) { 563 case MCAST_JOIN_GROUP: 564 case MCAST_LEAVE_GROUP: 565 { 566 struct compat_group_req __user *gr32 = (void *)optval; 567 struct group_req __user *kgr = 568 compat_alloc_user_space(sizeof(struct group_req)); 569 u32 interface; 570 571 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 572 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 573 __get_user(interface, &gr32->gr_interface) || 574 __put_user(interface, &kgr->gr_interface) || 575 copy_in_user(&kgr->gr_group, &gr32->gr_group, 576 sizeof(kgr->gr_group))) 577 return -EFAULT; 578 koptval = (char __user *)kgr; 579 koptlen = sizeof(struct group_req); 580 break; 581 } 582 case MCAST_JOIN_SOURCE_GROUP: 583 case MCAST_LEAVE_SOURCE_GROUP: 584 case MCAST_BLOCK_SOURCE: 585 case MCAST_UNBLOCK_SOURCE: 586 { 587 struct compat_group_source_req __user *gsr32 = (void *)optval; 588 struct group_source_req __user *kgsr = compat_alloc_user_space( 589 sizeof(struct group_source_req)); 590 u32 interface; 591 592 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 593 !access_ok(VERIFY_WRITE, kgsr, 594 sizeof(struct group_source_req)) || 595 __get_user(interface, &gsr32->gsr_interface) || 596 __put_user(interface, &kgsr->gsr_interface) || 597 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 598 sizeof(kgsr->gsr_group)) || 599 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 600 sizeof(kgsr->gsr_source))) 601 return -EFAULT; 602 koptval = (char __user *)kgsr; 603 koptlen = sizeof(struct group_source_req); 604 break; 605 } 606 case MCAST_MSFILTER: 607 { 608 struct compat_group_filter __user *gf32 = (void *)optval; 609 struct group_filter __user *kgf; 610 u32 interface, fmode, numsrc; 611 612 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 613 __get_user(interface, &gf32->gf_interface) || 614 __get_user(fmode, &gf32->gf_fmode) || 615 __get_user(numsrc, &gf32->gf_numsrc)) 616 return -EFAULT; 617 koptlen = optlen + sizeof(struct group_filter) - 618 sizeof(struct compat_group_filter); 619 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 620 return -EINVAL; 621 kgf = compat_alloc_user_space(koptlen); 622 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 623 __put_user(interface, &kgf->gf_interface) || 624 __put_user(fmode, &kgf->gf_fmode) || 625 __put_user(numsrc, &kgf->gf_numsrc) || 626 copy_in_user(&kgf->gf_group, &gf32->gf_group, 627 sizeof(kgf->gf_group)) || 628 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 629 numsrc * sizeof(kgf->gf_slist[0])))) 630 return -EFAULT; 631 koptval = (char __user *)kgf; 632 break; 633 } 634 635 default: 636 break; 637 } 638 return setsockopt(sock, level, optname, koptval, koptlen); 639 } 640 EXPORT_SYMBOL(compat_mc_setsockopt); 641 642 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 643 char __user *optval, int __user *optlen, 644 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 645 { 646 struct compat_group_filter __user *gf32 = (void *)optval; 647 struct group_filter __user *kgf; 648 int __user *koptlen; 649 u32 interface, fmode, numsrc; 650 int klen, ulen, err; 651 652 if (optname != MCAST_MSFILTER) 653 return getsockopt(sock, level, optname, optval, optlen); 654 655 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 656 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 657 __get_user(ulen, optlen)) 658 return -EFAULT; 659 660 /* adjust len for pad */ 661 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 662 663 if (klen < GROUP_FILTER_SIZE(0)) 664 return -EINVAL; 665 666 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 667 __put_user(klen, koptlen)) 668 return -EFAULT; 669 670 /* have to allow space for previous compat_alloc_user_space, too */ 671 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 672 673 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 674 __get_user(interface, &gf32->gf_interface) || 675 __get_user(fmode, &gf32->gf_fmode) || 676 __get_user(numsrc, &gf32->gf_numsrc) || 677 __put_user(interface, &kgf->gf_interface) || 678 __put_user(fmode, &kgf->gf_fmode) || 679 __put_user(numsrc, &kgf->gf_numsrc) || 680 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 681 return -EFAULT; 682 683 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 684 if (err) 685 return err; 686 687 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 688 __get_user(klen, koptlen)) 689 return -EFAULT; 690 691 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 692 693 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 694 __put_user(ulen, optlen)) 695 return -EFAULT; 696 697 if (!access_ok(VERIFY_READ, kgf, klen) || 698 !access_ok(VERIFY_WRITE, gf32, ulen) || 699 __get_user(interface, &kgf->gf_interface) || 700 __get_user(fmode, &kgf->gf_fmode) || 701 __get_user(numsrc, &kgf->gf_numsrc) || 702 __put_user(interface, &gf32->gf_interface) || 703 __put_user(fmode, &gf32->gf_fmode) || 704 __put_user(numsrc, &gf32->gf_numsrc)) 705 return -EFAULT; 706 if (numsrc) { 707 int copylen; 708 709 klen -= GROUP_FILTER_SIZE(0); 710 copylen = numsrc * sizeof(gf32->gf_slist[0]); 711 if (copylen > klen) 712 copylen = klen; 713 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 714 return -EFAULT; 715 } 716 return err; 717 } 718 EXPORT_SYMBOL(compat_mc_getsockopt); 719 720 721 /* Argument list sizes for compat_sys_socketcall */ 722 #define AL(x) ((x) * sizeof(u32)) 723 static unsigned char nas[21] = { 724 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 725 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 726 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 727 AL(4), AL(5), AL(4) 728 }; 729 #undef AL 730 731 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 732 { 733 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 734 } 735 736 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 737 unsigned int, vlen, unsigned int, flags) 738 { 739 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 740 flags | MSG_CMSG_COMPAT); 741 } 742 743 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 744 { 745 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 746 } 747 748 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 749 { 750 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 751 } 752 753 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 754 unsigned int, flags, struct sockaddr __user *, addr, 755 int __user *, addrlen) 756 { 757 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 758 } 759 760 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 761 unsigned int, vlen, unsigned int, flags, 762 struct compat_timespec __user *, timeout) 763 { 764 int datagrams; 765 struct timespec ktspec; 766 767 if (timeout == NULL) 768 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 769 flags | MSG_CMSG_COMPAT, NULL); 770 771 if (compat_get_timespec(&ktspec, timeout)) 772 return -EFAULT; 773 774 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 775 flags | MSG_CMSG_COMPAT, &ktspec); 776 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 777 datagrams = -EFAULT; 778 779 return datagrams; 780 } 781 782 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 783 { 784 int ret; 785 u32 a[6]; 786 u32 a0, a1; 787 788 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 789 return -EINVAL; 790 if (copy_from_user(a, args, nas[call])) 791 return -EFAULT; 792 a0 = a[0]; 793 a1 = a[1]; 794 795 switch (call) { 796 case SYS_SOCKET: 797 ret = sys_socket(a0, a1, a[2]); 798 break; 799 case SYS_BIND: 800 ret = sys_bind(a0, compat_ptr(a1), a[2]); 801 break; 802 case SYS_CONNECT: 803 ret = sys_connect(a0, compat_ptr(a1), a[2]); 804 break; 805 case SYS_LISTEN: 806 ret = sys_listen(a0, a1); 807 break; 808 case SYS_ACCEPT: 809 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 810 break; 811 case SYS_GETSOCKNAME: 812 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 813 break; 814 case SYS_GETPEERNAME: 815 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 816 break; 817 case SYS_SOCKETPAIR: 818 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 819 break; 820 case SYS_SEND: 821 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 822 break; 823 case SYS_SENDTO: 824 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 825 break; 826 case SYS_RECV: 827 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 828 break; 829 case SYS_RECVFROM: 830 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 831 compat_ptr(a[4]), compat_ptr(a[5])); 832 break; 833 case SYS_SHUTDOWN: 834 ret = sys_shutdown(a0, a1); 835 break; 836 case SYS_SETSOCKOPT: 837 ret = compat_sys_setsockopt(a0, a1, a[2], 838 compat_ptr(a[3]), a[4]); 839 break; 840 case SYS_GETSOCKOPT: 841 ret = compat_sys_getsockopt(a0, a1, a[2], 842 compat_ptr(a[3]), compat_ptr(a[4])); 843 break; 844 case SYS_SENDMSG: 845 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 846 break; 847 case SYS_SENDMMSG: 848 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 849 break; 850 case SYS_RECVMSG: 851 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 852 break; 853 case SYS_RECVMMSG: 854 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 855 compat_ptr(a[4])); 856 break; 857 case SYS_ACCEPT4: 858 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 859 break; 860 default: 861 ret = -EINVAL; 862 break; 863 } 864 return ret; 865 } 866