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 compat_uptr_t uaddr, uiov, tmp3; 41 compat_size_t nr_segs; 42 ssize_t err; 43 44 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 45 __get_user(uaddr, &umsg->msg_name) || 46 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 47 __get_user(uiov, &umsg->msg_iov) || 48 __get_user(nr_segs, &umsg->msg_iovlen) || 49 __get_user(tmp3, &umsg->msg_control) || 50 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 51 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 52 return -EFAULT; 53 54 if (!uaddr) 55 kmsg->msg_namelen = 0; 56 57 if (kmsg->msg_namelen < 0) 58 return -EINVAL; 59 60 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 61 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 62 kmsg->msg_control = compat_ptr(tmp3); 63 64 if (save_addr) 65 *save_addr = compat_ptr(uaddr); 66 67 if (uaddr && kmsg->msg_namelen) { 68 if (!save_addr) { 69 err = move_addr_to_kernel(compat_ptr(uaddr), 70 kmsg->msg_namelen, 71 kmsg->msg_name); 72 if (err < 0) 73 return err; 74 } 75 } else { 76 kmsg->msg_name = NULL; 77 kmsg->msg_namelen = 0; 78 } 79 80 if (nr_segs > UIO_MAXIOV) 81 return -EMSGSIZE; 82 83 kmsg->msg_iocb = NULL; 84 85 return compat_import_iovec(save_addr ? READ : WRITE, 86 compat_ptr(uiov), nr_segs, 87 UIO_FASTIOV, iov, &kmsg->msg_iter); 88 } 89 90 /* Bleech... */ 91 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 92 93 #define CMSG_COMPAT_DATA(cmsg) \ 94 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr))) 95 #define CMSG_COMPAT_SPACE(len) \ 96 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) 97 #define CMSG_COMPAT_LEN(len) \ 98 (sizeof(struct compat_cmsghdr) + (len)) 99 100 #define CMSG_COMPAT_FIRSTHDR(msg) \ 101 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 102 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 103 (struct compat_cmsghdr __user *)NULL) 104 105 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 106 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 107 (ucmlen) <= (unsigned long) \ 108 ((mhdr)->msg_controllen - \ 109 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 110 111 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 112 struct compat_cmsghdr __user *cmsg, int cmsg_len) 113 { 114 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 115 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 116 msg->msg_controllen) 117 return NULL; 118 return (struct compat_cmsghdr __user *)ptr; 119 } 120 121 /* There is a lot of hair here because the alignment rules (and 122 * thus placement) of cmsg headers and length are different for 123 * 32-bit apps. -DaveM 124 */ 125 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 126 unsigned char *stackbuf, int stackbuf_size) 127 { 128 struct compat_cmsghdr __user *ucmsg; 129 struct cmsghdr *kcmsg, *kcmsg_base; 130 compat_size_t ucmlen; 131 __kernel_size_t kcmlen, tmp; 132 int err = -EFAULT; 133 134 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != 135 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); 136 137 kcmlen = 0; 138 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 139 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 140 while (ucmsg != NULL) { 141 if (get_user(ucmlen, &ucmsg->cmsg_len)) 142 return -EFAULT; 143 144 /* Catch bogons. */ 145 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 146 return -EINVAL; 147 148 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 149 tmp = CMSG_ALIGN(tmp); 150 kcmlen += tmp; 151 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 152 } 153 if (kcmlen == 0) 154 return -EINVAL; 155 156 /* The kcmlen holds the 64-bit version of the control length. 157 * It may not be modified as we do not stick it into the kmsg 158 * until we have successfully copied over all of the data 159 * from the user. 160 */ 161 if (kcmlen > stackbuf_size) 162 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 163 if (kcmsg == NULL) 164 return -ENOBUFS; 165 166 /* Now copy them over neatly. */ 167 memset(kcmsg, 0, kcmlen); 168 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 169 while (ucmsg != NULL) { 170 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 171 goto Efault; 172 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 173 goto Einval; 174 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 175 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 176 goto Einval; 177 kcmsg->cmsg_len = tmp; 178 tmp = CMSG_ALIGN(tmp); 179 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 180 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 181 copy_from_user(CMSG_DATA(kcmsg), 182 CMSG_COMPAT_DATA(ucmsg), 183 (ucmlen - sizeof(*ucmsg)))) 184 goto Efault; 185 186 /* Advance. */ 187 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 188 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 189 } 190 191 /* Ok, looks like we made it. Hook it up and return success. */ 192 kmsg->msg_control = kcmsg_base; 193 kmsg->msg_controllen = kcmlen; 194 return 0; 195 196 Einval: 197 err = -EINVAL; 198 Efault: 199 if (kcmsg_base != (struct cmsghdr *)stackbuf) 200 sock_kfree_s(sk, kcmsg_base, kcmlen); 201 return err; 202 } 203 204 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 205 { 206 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 207 struct compat_cmsghdr cmhdr; 208 struct compat_timeval ctv; 209 struct compat_timespec cts[3]; 210 int cmlen; 211 212 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 213 kmsg->msg_flags |= MSG_CTRUNC; 214 return 0; /* XXX: return error? check spec. */ 215 } 216 217 if (!COMPAT_USE_64BIT_TIME) { 218 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 219 struct timeval *tv = (struct timeval *)data; 220 ctv.tv_sec = tv->tv_sec; 221 ctv.tv_usec = tv->tv_usec; 222 data = &ctv; 223 len = sizeof(ctv); 224 } 225 if (level == SOL_SOCKET && 226 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 227 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 228 int i; 229 struct timespec *ts = (struct timespec *)data; 230 for (i = 0; i < count; i++) { 231 cts[i].tv_sec = ts[i].tv_sec; 232 cts[i].tv_nsec = ts[i].tv_nsec; 233 } 234 data = &cts; 235 len = sizeof(cts[0]) * count; 236 } 237 } 238 239 cmlen = CMSG_COMPAT_LEN(len); 240 if (kmsg->msg_controllen < cmlen) { 241 kmsg->msg_flags |= MSG_CTRUNC; 242 cmlen = kmsg->msg_controllen; 243 } 244 cmhdr.cmsg_level = level; 245 cmhdr.cmsg_type = type; 246 cmhdr.cmsg_len = cmlen; 247 248 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 249 return -EFAULT; 250 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 251 return -EFAULT; 252 cmlen = CMSG_COMPAT_SPACE(len); 253 if (kmsg->msg_controllen < cmlen) 254 cmlen = kmsg->msg_controllen; 255 kmsg->msg_control += cmlen; 256 kmsg->msg_controllen -= cmlen; 257 return 0; 258 } 259 260 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 261 { 262 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 263 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 264 int fdnum = scm->fp->count; 265 struct file **fp = scm->fp->fp; 266 int __user *cmfptr; 267 int err = 0, i; 268 269 if (fdnum < fdmax) 270 fdmax = fdnum; 271 272 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 273 int new_fd; 274 err = security_file_receive(fp[i]); 275 if (err) 276 break; 277 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 278 ? O_CLOEXEC : 0); 279 if (err < 0) 280 break; 281 new_fd = err; 282 err = put_user(new_fd, cmfptr); 283 if (err) { 284 put_unused_fd(new_fd); 285 break; 286 } 287 /* Bump the usage count and install the file. */ 288 fd_install(new_fd, get_file(fp[i])); 289 } 290 291 if (i > 0) { 292 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 293 err = put_user(SOL_SOCKET, &cm->cmsg_level); 294 if (!err) 295 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 296 if (!err) 297 err = put_user(cmlen, &cm->cmsg_len); 298 if (!err) { 299 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 300 kmsg->msg_control += cmlen; 301 kmsg->msg_controllen -= cmlen; 302 } 303 } 304 if (i < fdnum) 305 kmsg->msg_flags |= MSG_CTRUNC; 306 307 /* 308 * All of the files that fit in the message have had their 309 * usage counts incremented, so we just free the list. 310 */ 311 __scm_destroy(scm); 312 } 313 314 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 315 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 316 { 317 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 318 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 319 compat_uptr_t ptr; 320 u16 len; 321 322 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 323 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 324 __get_user(len, &fprog32->len) || 325 __get_user(ptr, &fprog32->filter) || 326 __put_user(len, &kfprog->len) || 327 __put_user(compat_ptr(ptr), &kfprog->filter)) 328 return NULL; 329 330 return kfprog; 331 } 332 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 333 334 static int do_set_attach_filter(struct socket *sock, int level, int optname, 335 char __user *optval, unsigned int optlen) 336 { 337 struct sock_fprog __user *kfprog; 338 339 kfprog = get_compat_bpf_fprog(optval); 340 if (!kfprog) 341 return -EFAULT; 342 343 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 344 sizeof(struct sock_fprog)); 345 } 346 347 static int do_set_sock_timeout(struct socket *sock, int level, 348 int optname, char __user *optval, unsigned int optlen) 349 { 350 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 351 struct timeval ktime; 352 mm_segment_t old_fs; 353 int err; 354 355 if (optlen < sizeof(*up)) 356 return -EINVAL; 357 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 358 __get_user(ktime.tv_sec, &up->tv_sec) || 359 __get_user(ktime.tv_usec, &up->tv_usec)) 360 return -EFAULT; 361 old_fs = get_fs(); 362 set_fs(KERNEL_DS); 363 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 364 set_fs(old_fs); 365 366 return err; 367 } 368 369 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 370 char __user *optval, unsigned int optlen) 371 { 372 if (optname == SO_ATTACH_FILTER || 373 optname == SO_ATTACH_REUSEPORT_CBPF) 374 return do_set_attach_filter(sock, level, optname, 375 optval, optlen); 376 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 377 return do_set_sock_timeout(sock, level, optname, optval, optlen); 378 379 return sock_setsockopt(sock, level, optname, optval, optlen); 380 } 381 382 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 383 char __user *, optval, unsigned int, optlen) 384 { 385 int err; 386 struct socket *sock = sockfd_lookup(fd, &err); 387 388 if (sock) { 389 err = security_socket_setsockopt(sock, level, optname); 390 if (err) { 391 sockfd_put(sock); 392 return err; 393 } 394 395 if (level == SOL_SOCKET) 396 err = compat_sock_setsockopt(sock, level, 397 optname, optval, optlen); 398 else if (sock->ops->compat_setsockopt) 399 err = sock->ops->compat_setsockopt(sock, level, 400 optname, optval, optlen); 401 else 402 err = sock->ops->setsockopt(sock, level, 403 optname, optval, optlen); 404 sockfd_put(sock); 405 } 406 return err; 407 } 408 409 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 410 char __user *optval, int __user *optlen) 411 { 412 struct compat_timeval __user *up; 413 struct timeval ktime; 414 mm_segment_t old_fs; 415 int len, err; 416 417 up = (struct compat_timeval __user *) optval; 418 if (get_user(len, optlen)) 419 return -EFAULT; 420 if (len < sizeof(*up)) 421 return -EINVAL; 422 len = sizeof(ktime); 423 old_fs = get_fs(); 424 set_fs(KERNEL_DS); 425 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 426 set_fs(old_fs); 427 428 if (!err) { 429 if (put_user(sizeof(*up), optlen) || 430 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 431 __put_user(ktime.tv_sec, &up->tv_sec) || 432 __put_user(ktime.tv_usec, &up->tv_usec)) 433 err = -EFAULT; 434 } 435 return err; 436 } 437 438 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 439 char __user *optval, int __user *optlen) 440 { 441 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 442 return do_get_sock_timeout(sock, level, optname, optval, optlen); 443 return sock_getsockopt(sock, level, optname, optval, optlen); 444 } 445 446 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 447 { 448 struct compat_timeval __user *ctv; 449 int err; 450 struct timeval tv; 451 452 if (COMPAT_USE_64BIT_TIME) 453 return sock_get_timestamp(sk, userstamp); 454 455 ctv = (struct compat_timeval __user *) userstamp; 456 err = -ENOENT; 457 if (!sock_flag(sk, SOCK_TIMESTAMP)) 458 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 459 tv = ktime_to_timeval(sk->sk_stamp); 460 if (tv.tv_sec == -1) 461 return err; 462 if (tv.tv_sec == 0) { 463 sk->sk_stamp = ktime_get_real(); 464 tv = ktime_to_timeval(sk->sk_stamp); 465 } 466 err = 0; 467 if (put_user(tv.tv_sec, &ctv->tv_sec) || 468 put_user(tv.tv_usec, &ctv->tv_usec)) 469 err = -EFAULT; 470 return err; 471 } 472 EXPORT_SYMBOL(compat_sock_get_timestamp); 473 474 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 475 { 476 struct compat_timespec __user *ctv; 477 int err; 478 struct timespec ts; 479 480 if (COMPAT_USE_64BIT_TIME) 481 return sock_get_timestampns (sk, userstamp); 482 483 ctv = (struct compat_timespec __user *) userstamp; 484 err = -ENOENT; 485 if (!sock_flag(sk, SOCK_TIMESTAMP)) 486 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 487 ts = ktime_to_timespec(sk->sk_stamp); 488 if (ts.tv_sec == -1) 489 return err; 490 if (ts.tv_sec == 0) { 491 sk->sk_stamp = ktime_get_real(); 492 ts = ktime_to_timespec(sk->sk_stamp); 493 } 494 err = 0; 495 if (put_user(ts.tv_sec, &ctv->tv_sec) || 496 put_user(ts.tv_nsec, &ctv->tv_nsec)) 497 err = -EFAULT; 498 return err; 499 } 500 EXPORT_SYMBOL(compat_sock_get_timestampns); 501 502 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 503 char __user *, optval, int __user *, optlen) 504 { 505 int err; 506 struct socket *sock = sockfd_lookup(fd, &err); 507 508 if (sock) { 509 err = security_socket_getsockopt(sock, level, optname); 510 if (err) { 511 sockfd_put(sock); 512 return err; 513 } 514 515 if (level == SOL_SOCKET) 516 err = compat_sock_getsockopt(sock, level, 517 optname, optval, optlen); 518 else if (sock->ops->compat_getsockopt) 519 err = sock->ops->compat_getsockopt(sock, level, 520 optname, optval, optlen); 521 else 522 err = sock->ops->getsockopt(sock, level, 523 optname, optval, optlen); 524 sockfd_put(sock); 525 } 526 return err; 527 } 528 529 struct compat_group_req { 530 __u32 gr_interface; 531 struct __kernel_sockaddr_storage gr_group 532 __aligned(4); 533 } __packed; 534 535 struct compat_group_source_req { 536 __u32 gsr_interface; 537 struct __kernel_sockaddr_storage gsr_group 538 __aligned(4); 539 struct __kernel_sockaddr_storage gsr_source 540 __aligned(4); 541 } __packed; 542 543 struct compat_group_filter { 544 __u32 gf_interface; 545 struct __kernel_sockaddr_storage gf_group 546 __aligned(4); 547 __u32 gf_fmode; 548 __u32 gf_numsrc; 549 struct __kernel_sockaddr_storage gf_slist[1] 550 __aligned(4); 551 } __packed; 552 553 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 554 sizeof(struct __kernel_sockaddr_storage)) 555 556 557 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 558 char __user *optval, unsigned int optlen, 559 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 560 { 561 char __user *koptval = optval; 562 int koptlen = optlen; 563 564 switch (optname) { 565 case MCAST_JOIN_GROUP: 566 case MCAST_LEAVE_GROUP: 567 { 568 struct compat_group_req __user *gr32 = (void *)optval; 569 struct group_req __user *kgr = 570 compat_alloc_user_space(sizeof(struct group_req)); 571 u32 interface; 572 573 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 574 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 575 __get_user(interface, &gr32->gr_interface) || 576 __put_user(interface, &kgr->gr_interface) || 577 copy_in_user(&kgr->gr_group, &gr32->gr_group, 578 sizeof(kgr->gr_group))) 579 return -EFAULT; 580 koptval = (char __user *)kgr; 581 koptlen = sizeof(struct group_req); 582 break; 583 } 584 case MCAST_JOIN_SOURCE_GROUP: 585 case MCAST_LEAVE_SOURCE_GROUP: 586 case MCAST_BLOCK_SOURCE: 587 case MCAST_UNBLOCK_SOURCE: 588 { 589 struct compat_group_source_req __user *gsr32 = (void *)optval; 590 struct group_source_req __user *kgsr = compat_alloc_user_space( 591 sizeof(struct group_source_req)); 592 u32 interface; 593 594 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 595 !access_ok(VERIFY_WRITE, kgsr, 596 sizeof(struct group_source_req)) || 597 __get_user(interface, &gsr32->gsr_interface) || 598 __put_user(interface, &kgsr->gsr_interface) || 599 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 600 sizeof(kgsr->gsr_group)) || 601 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 602 sizeof(kgsr->gsr_source))) 603 return -EFAULT; 604 koptval = (char __user *)kgsr; 605 koptlen = sizeof(struct group_source_req); 606 break; 607 } 608 case MCAST_MSFILTER: 609 { 610 struct compat_group_filter __user *gf32 = (void *)optval; 611 struct group_filter __user *kgf; 612 u32 interface, fmode, numsrc; 613 614 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 615 __get_user(interface, &gf32->gf_interface) || 616 __get_user(fmode, &gf32->gf_fmode) || 617 __get_user(numsrc, &gf32->gf_numsrc)) 618 return -EFAULT; 619 koptlen = optlen + sizeof(struct group_filter) - 620 sizeof(struct compat_group_filter); 621 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 622 return -EINVAL; 623 kgf = compat_alloc_user_space(koptlen); 624 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 625 __put_user(interface, &kgf->gf_interface) || 626 __put_user(fmode, &kgf->gf_fmode) || 627 __put_user(numsrc, &kgf->gf_numsrc) || 628 copy_in_user(&kgf->gf_group, &gf32->gf_group, 629 sizeof(kgf->gf_group)) || 630 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 631 numsrc * sizeof(kgf->gf_slist[0])))) 632 return -EFAULT; 633 koptval = (char __user *)kgf; 634 break; 635 } 636 637 default: 638 break; 639 } 640 return setsockopt(sock, level, optname, koptval, koptlen); 641 } 642 EXPORT_SYMBOL(compat_mc_setsockopt); 643 644 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 645 char __user *optval, int __user *optlen, 646 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 647 { 648 struct compat_group_filter __user *gf32 = (void *)optval; 649 struct group_filter __user *kgf; 650 int __user *koptlen; 651 u32 interface, fmode, numsrc; 652 int klen, ulen, err; 653 654 if (optname != MCAST_MSFILTER) 655 return getsockopt(sock, level, optname, optval, optlen); 656 657 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 658 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 659 __get_user(ulen, optlen)) 660 return -EFAULT; 661 662 /* adjust len for pad */ 663 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 664 665 if (klen < GROUP_FILTER_SIZE(0)) 666 return -EINVAL; 667 668 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 669 __put_user(klen, koptlen)) 670 return -EFAULT; 671 672 /* have to allow space for previous compat_alloc_user_space, too */ 673 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 674 675 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 676 __get_user(interface, &gf32->gf_interface) || 677 __get_user(fmode, &gf32->gf_fmode) || 678 __get_user(numsrc, &gf32->gf_numsrc) || 679 __put_user(interface, &kgf->gf_interface) || 680 __put_user(fmode, &kgf->gf_fmode) || 681 __put_user(numsrc, &kgf->gf_numsrc) || 682 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 683 return -EFAULT; 684 685 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 686 if (err) 687 return err; 688 689 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 690 __get_user(klen, koptlen)) 691 return -EFAULT; 692 693 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 694 695 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 696 __put_user(ulen, optlen)) 697 return -EFAULT; 698 699 if (!access_ok(VERIFY_READ, kgf, klen) || 700 !access_ok(VERIFY_WRITE, gf32, ulen) || 701 __get_user(interface, &kgf->gf_interface) || 702 __get_user(fmode, &kgf->gf_fmode) || 703 __get_user(numsrc, &kgf->gf_numsrc) || 704 __put_user(interface, &gf32->gf_interface) || 705 __put_user(fmode, &gf32->gf_fmode) || 706 __put_user(numsrc, &gf32->gf_numsrc)) 707 return -EFAULT; 708 if (numsrc) { 709 int copylen; 710 711 klen -= GROUP_FILTER_SIZE(0); 712 copylen = numsrc * sizeof(gf32->gf_slist[0]); 713 if (copylen > klen) 714 copylen = klen; 715 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 716 return -EFAULT; 717 } 718 return err; 719 } 720 EXPORT_SYMBOL(compat_mc_getsockopt); 721 722 723 /* Argument list sizes for compat_sys_socketcall */ 724 #define AL(x) ((x) * sizeof(u32)) 725 static unsigned char nas[21] = { 726 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 727 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 728 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 729 AL(4), AL(5), AL(4) 730 }; 731 #undef AL 732 733 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 734 { 735 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 736 } 737 738 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 739 unsigned int, vlen, unsigned int, flags) 740 { 741 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 742 flags | MSG_CMSG_COMPAT); 743 } 744 745 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 746 { 747 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 748 } 749 750 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 751 { 752 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 753 } 754 755 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 756 unsigned int, flags, struct sockaddr __user *, addr, 757 int __user *, addrlen) 758 { 759 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 760 } 761 762 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 763 unsigned int, vlen, unsigned int, flags, 764 struct compat_timespec __user *, timeout) 765 { 766 int datagrams; 767 struct timespec ktspec; 768 769 if (timeout == NULL) 770 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 771 flags | MSG_CMSG_COMPAT, NULL); 772 773 if (compat_get_timespec(&ktspec, timeout)) 774 return -EFAULT; 775 776 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 777 flags | MSG_CMSG_COMPAT, &ktspec); 778 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 779 datagrams = -EFAULT; 780 781 return datagrams; 782 } 783 784 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 785 { 786 u32 a[AUDITSC_ARGS]; 787 unsigned int len; 788 u32 a0, a1; 789 int ret; 790 791 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 792 return -EINVAL; 793 len = nas[call]; 794 if (len > sizeof(a)) 795 return -EINVAL; 796 797 if (copy_from_user(a, args, len)) 798 return -EFAULT; 799 800 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 801 if (ret) 802 return ret; 803 804 a0 = a[0]; 805 a1 = a[1]; 806 807 switch (call) { 808 case SYS_SOCKET: 809 ret = sys_socket(a0, a1, a[2]); 810 break; 811 case SYS_BIND: 812 ret = sys_bind(a0, compat_ptr(a1), a[2]); 813 break; 814 case SYS_CONNECT: 815 ret = sys_connect(a0, compat_ptr(a1), a[2]); 816 break; 817 case SYS_LISTEN: 818 ret = sys_listen(a0, a1); 819 break; 820 case SYS_ACCEPT: 821 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 822 break; 823 case SYS_GETSOCKNAME: 824 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 825 break; 826 case SYS_GETPEERNAME: 827 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 828 break; 829 case SYS_SOCKETPAIR: 830 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 831 break; 832 case SYS_SEND: 833 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 834 break; 835 case SYS_SENDTO: 836 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 837 break; 838 case SYS_RECV: 839 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 840 break; 841 case SYS_RECVFROM: 842 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 843 compat_ptr(a[4]), compat_ptr(a[5])); 844 break; 845 case SYS_SHUTDOWN: 846 ret = sys_shutdown(a0, a1); 847 break; 848 case SYS_SETSOCKOPT: 849 ret = compat_sys_setsockopt(a0, a1, a[2], 850 compat_ptr(a[3]), a[4]); 851 break; 852 case SYS_GETSOCKOPT: 853 ret = compat_sys_getsockopt(a0, a1, a[2], 854 compat_ptr(a[3]), compat_ptr(a[4])); 855 break; 856 case SYS_SENDMSG: 857 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 858 break; 859 case SYS_SENDMMSG: 860 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 861 break; 862 case SYS_RECVMSG: 863 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 864 break; 865 case SYS_RECVMMSG: 866 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 867 compat_ptr(a[4])); 868 break; 869 case SYS_ACCEPT4: 870 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 871 break; 872 default: 873 ret = -EINVAL; 874 break; 875 } 876 return ret; 877 } 878