1 /* 2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c. 3 * 4 * Copyright (C) 2000 VA Linux Co 5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> 6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> 7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) 9 * Copyright (C) 2000 Hewlett-Packard Co. 10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> 11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/gfp.h> 16 #include <linux/fs.h> 17 #include <linux/types.h> 18 #include <linux/file.h> 19 #include <linux/icmpv6.h> 20 #include <linux/socket.h> 21 #include <linux/syscalls.h> 22 #include <linux/filter.h> 23 #include <linux/compat.h> 24 #include <linux/security.h> 25 #include <linux/audit.h> 26 #include <linux/export.h> 27 28 #include <net/scm.h> 29 #include <net/sock.h> 30 #include <net/ip.h> 31 #include <net/ipv6.h> 32 #include <linux/uaccess.h> 33 #include <net/compat.h> 34 35 int get_compat_msghdr(struct msghdr *kmsg, 36 struct compat_msghdr __user *umsg, 37 struct sockaddr __user **save_addr, 38 struct iovec **iov) 39 { 40 struct compat_msghdr msg; 41 ssize_t err; 42 43 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 44 return -EFAULT; 45 46 kmsg->msg_flags = msg.msg_flags; 47 kmsg->msg_namelen = msg.msg_namelen; 48 49 if (!msg.msg_name) 50 kmsg->msg_namelen = 0; 51 52 if (kmsg->msg_namelen < 0) 53 return -EINVAL; 54 55 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 56 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 57 58 kmsg->msg_control = compat_ptr(msg.msg_control); 59 kmsg->msg_controllen = msg.msg_controllen; 60 61 if (save_addr) 62 *save_addr = compat_ptr(msg.msg_name); 63 64 if (msg.msg_name && kmsg->msg_namelen) { 65 if (!save_addr) { 66 err = move_addr_to_kernel(compat_ptr(msg.msg_name), 67 kmsg->msg_namelen, 68 kmsg->msg_name); 69 if (err < 0) 70 return err; 71 } 72 } else { 73 kmsg->msg_name = NULL; 74 kmsg->msg_namelen = 0; 75 } 76 77 if (msg.msg_iovlen > UIO_MAXIOV) 78 return -EMSGSIZE; 79 80 kmsg->msg_iocb = NULL; 81 82 return compat_import_iovec(save_addr ? READ : WRITE, 83 compat_ptr(msg.msg_iov), msg.msg_iovlen, 84 UIO_FASTIOV, iov, &kmsg->msg_iter); 85 } 86 87 /* Bleech... */ 88 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 89 90 #define CMSG_COMPAT_DATA(cmsg) \ 91 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr))) 92 #define CMSG_COMPAT_SPACE(len) \ 93 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) 94 #define CMSG_COMPAT_LEN(len) \ 95 (sizeof(struct compat_cmsghdr) + (len)) 96 97 #define CMSG_COMPAT_FIRSTHDR(msg) \ 98 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 99 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 100 (struct compat_cmsghdr __user *)NULL) 101 102 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 103 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 104 (ucmlen) <= (unsigned long) \ 105 ((mhdr)->msg_controllen - \ 106 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 107 108 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 109 struct compat_cmsghdr __user *cmsg, int cmsg_len) 110 { 111 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 112 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 113 msg->msg_controllen) 114 return NULL; 115 return (struct compat_cmsghdr __user *)ptr; 116 } 117 118 /* There is a lot of hair here because the alignment rules (and 119 * thus placement) of cmsg headers and length are different for 120 * 32-bit apps. -DaveM 121 */ 122 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 123 unsigned char *stackbuf, int stackbuf_size) 124 { 125 struct compat_cmsghdr __user *ucmsg; 126 struct cmsghdr *kcmsg, *kcmsg_base; 127 compat_size_t ucmlen; 128 __kernel_size_t kcmlen, tmp; 129 int err = -EFAULT; 130 131 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != 132 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); 133 134 kcmlen = 0; 135 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 136 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 137 while (ucmsg != NULL) { 138 if (get_user(ucmlen, &ucmsg->cmsg_len)) 139 return -EFAULT; 140 141 /* Catch bogons. */ 142 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 143 return -EINVAL; 144 145 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 146 tmp = CMSG_ALIGN(tmp); 147 kcmlen += tmp; 148 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 149 } 150 if (kcmlen == 0) 151 return -EINVAL; 152 153 /* The kcmlen holds the 64-bit version of the control length. 154 * It may not be modified as we do not stick it into the kmsg 155 * until we have successfully copied over all of the data 156 * from the user. 157 */ 158 if (kcmlen > stackbuf_size) 159 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 160 if (kcmsg == NULL) 161 return -ENOBUFS; 162 163 /* Now copy them over neatly. */ 164 memset(kcmsg, 0, kcmlen); 165 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 166 while (ucmsg != NULL) { 167 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 168 goto Efault; 169 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 170 goto Einval; 171 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 172 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 173 goto Einval; 174 kcmsg->cmsg_len = tmp; 175 tmp = CMSG_ALIGN(tmp); 176 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 177 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 178 copy_from_user(CMSG_DATA(kcmsg), 179 CMSG_COMPAT_DATA(ucmsg), 180 (ucmlen - sizeof(*ucmsg)))) 181 goto Efault; 182 183 /* Advance. */ 184 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 185 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 186 } 187 188 /* Ok, looks like we made it. Hook it up and return success. */ 189 kmsg->msg_control = kcmsg_base; 190 kmsg->msg_controllen = kcmlen; 191 return 0; 192 193 Einval: 194 err = -EINVAL; 195 Efault: 196 if (kcmsg_base != (struct cmsghdr *)stackbuf) 197 sock_kfree_s(sk, kcmsg_base, kcmlen); 198 return err; 199 } 200 201 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 202 { 203 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 204 struct compat_cmsghdr cmhdr; 205 struct compat_timeval ctv; 206 struct compat_timespec cts[3]; 207 int cmlen; 208 209 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 210 kmsg->msg_flags |= MSG_CTRUNC; 211 return 0; /* XXX: return error? check spec. */ 212 } 213 214 if (!COMPAT_USE_64BIT_TIME) { 215 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 216 struct timeval *tv = (struct timeval *)data; 217 ctv.tv_sec = tv->tv_sec; 218 ctv.tv_usec = tv->tv_usec; 219 data = &ctv; 220 len = sizeof(ctv); 221 } 222 if (level == SOL_SOCKET && 223 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 224 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 225 int i; 226 struct timespec *ts = (struct timespec *)data; 227 for (i = 0; i < count; i++) { 228 cts[i].tv_sec = ts[i].tv_sec; 229 cts[i].tv_nsec = ts[i].tv_nsec; 230 } 231 data = &cts; 232 len = sizeof(cts[0]) * count; 233 } 234 } 235 236 cmlen = CMSG_COMPAT_LEN(len); 237 if (kmsg->msg_controllen < cmlen) { 238 kmsg->msg_flags |= MSG_CTRUNC; 239 cmlen = kmsg->msg_controllen; 240 } 241 cmhdr.cmsg_level = level; 242 cmhdr.cmsg_type = type; 243 cmhdr.cmsg_len = cmlen; 244 245 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 246 return -EFAULT; 247 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 248 return -EFAULT; 249 cmlen = CMSG_COMPAT_SPACE(len); 250 if (kmsg->msg_controllen < cmlen) 251 cmlen = kmsg->msg_controllen; 252 kmsg->msg_control += cmlen; 253 kmsg->msg_controllen -= cmlen; 254 return 0; 255 } 256 257 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 258 { 259 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 260 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 261 int fdnum = scm->fp->count; 262 struct file **fp = scm->fp->fp; 263 int __user *cmfptr; 264 int err = 0, i; 265 266 if (fdnum < fdmax) 267 fdmax = fdnum; 268 269 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 270 int new_fd; 271 err = security_file_receive(fp[i]); 272 if (err) 273 break; 274 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 275 ? O_CLOEXEC : 0); 276 if (err < 0) 277 break; 278 new_fd = err; 279 err = put_user(new_fd, cmfptr); 280 if (err) { 281 put_unused_fd(new_fd); 282 break; 283 } 284 /* Bump the usage count and install the file. */ 285 fd_install(new_fd, get_file(fp[i])); 286 } 287 288 if (i > 0) { 289 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 290 err = put_user(SOL_SOCKET, &cm->cmsg_level); 291 if (!err) 292 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 293 if (!err) 294 err = put_user(cmlen, &cm->cmsg_len); 295 if (!err) { 296 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 297 kmsg->msg_control += cmlen; 298 kmsg->msg_controllen -= cmlen; 299 } 300 } 301 if (i < fdnum) 302 kmsg->msg_flags |= MSG_CTRUNC; 303 304 /* 305 * All of the files that fit in the message have had their 306 * usage counts incremented, so we just free the list. 307 */ 308 __scm_destroy(scm); 309 } 310 311 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 312 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 313 { 314 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 315 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 316 struct compat_sock_fprog f32; 317 struct sock_fprog f; 318 319 if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) 320 return NULL; 321 memset(&f, 0, sizeof(f)); 322 f.len = f32.len; 323 f.filter = compat_ptr(f32.filter); 324 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) 325 return NULL; 326 327 return kfprog; 328 } 329 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 330 331 static int do_set_attach_filter(struct socket *sock, int level, int optname, 332 char __user *optval, unsigned int optlen) 333 { 334 struct sock_fprog __user *kfprog; 335 336 kfprog = get_compat_bpf_fprog(optval); 337 if (!kfprog) 338 return -EFAULT; 339 340 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 341 sizeof(struct sock_fprog)); 342 } 343 344 static int do_set_sock_timeout(struct socket *sock, int level, 345 int optname, char __user *optval, unsigned int optlen) 346 { 347 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 348 struct timeval ktime; 349 mm_segment_t old_fs; 350 int err; 351 352 if (optlen < sizeof(*up)) 353 return -EINVAL; 354 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 355 __get_user(ktime.tv_sec, &up->tv_sec) || 356 __get_user(ktime.tv_usec, &up->tv_usec)) 357 return -EFAULT; 358 old_fs = get_fs(); 359 set_fs(KERNEL_DS); 360 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 361 set_fs(old_fs); 362 363 return err; 364 } 365 366 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 367 char __user *optval, unsigned int optlen) 368 { 369 if (optname == SO_ATTACH_FILTER || 370 optname == SO_ATTACH_REUSEPORT_CBPF) 371 return do_set_attach_filter(sock, level, optname, 372 optval, optlen); 373 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 374 return do_set_sock_timeout(sock, level, optname, optval, optlen); 375 376 return sock_setsockopt(sock, level, optname, optval, optlen); 377 } 378 379 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 380 char __user *, optval, unsigned int, optlen) 381 { 382 int err; 383 struct socket *sock = sockfd_lookup(fd, &err); 384 385 if (sock) { 386 err = security_socket_setsockopt(sock, level, optname); 387 if (err) { 388 sockfd_put(sock); 389 return err; 390 } 391 392 if (level == SOL_SOCKET) 393 err = compat_sock_setsockopt(sock, level, 394 optname, optval, optlen); 395 else if (sock->ops->compat_setsockopt) 396 err = sock->ops->compat_setsockopt(sock, level, 397 optname, optval, optlen); 398 else 399 err = sock->ops->setsockopt(sock, level, 400 optname, optval, optlen); 401 sockfd_put(sock); 402 } 403 return err; 404 } 405 406 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 407 char __user *optval, int __user *optlen) 408 { 409 struct compat_timeval __user *up; 410 struct timeval ktime; 411 mm_segment_t old_fs; 412 int len, err; 413 414 up = (struct compat_timeval __user *) optval; 415 if (get_user(len, optlen)) 416 return -EFAULT; 417 if (len < sizeof(*up)) 418 return -EINVAL; 419 len = sizeof(ktime); 420 old_fs = get_fs(); 421 set_fs(KERNEL_DS); 422 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 423 set_fs(old_fs); 424 425 if (!err) { 426 if (put_user(sizeof(*up), optlen) || 427 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 428 __put_user(ktime.tv_sec, &up->tv_sec) || 429 __put_user(ktime.tv_usec, &up->tv_usec)) 430 err = -EFAULT; 431 } 432 return err; 433 } 434 435 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 436 char __user *optval, int __user *optlen) 437 { 438 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 439 return do_get_sock_timeout(sock, level, optname, optval, optlen); 440 return sock_getsockopt(sock, level, optname, optval, optlen); 441 } 442 443 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 444 { 445 struct compat_timeval __user *ctv; 446 int err; 447 struct timeval tv; 448 449 if (COMPAT_USE_64BIT_TIME) 450 return sock_get_timestamp(sk, userstamp); 451 452 ctv = (struct compat_timeval __user *) userstamp; 453 err = -ENOENT; 454 if (!sock_flag(sk, SOCK_TIMESTAMP)) 455 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 456 tv = ktime_to_timeval(sk->sk_stamp); 457 if (tv.tv_sec == -1) 458 return err; 459 if (tv.tv_sec == 0) { 460 sk->sk_stamp = ktime_get_real(); 461 tv = ktime_to_timeval(sk->sk_stamp); 462 } 463 err = 0; 464 if (put_user(tv.tv_sec, &ctv->tv_sec) || 465 put_user(tv.tv_usec, &ctv->tv_usec)) 466 err = -EFAULT; 467 return err; 468 } 469 EXPORT_SYMBOL(compat_sock_get_timestamp); 470 471 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 472 { 473 struct compat_timespec __user *ctv; 474 int err; 475 struct timespec ts; 476 477 if (COMPAT_USE_64BIT_TIME) 478 return sock_get_timestampns (sk, userstamp); 479 480 ctv = (struct compat_timespec __user *) userstamp; 481 err = -ENOENT; 482 if (!sock_flag(sk, SOCK_TIMESTAMP)) 483 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 484 ts = ktime_to_timespec(sk->sk_stamp); 485 if (ts.tv_sec == -1) 486 return err; 487 if (ts.tv_sec == 0) { 488 sk->sk_stamp = ktime_get_real(); 489 ts = ktime_to_timespec(sk->sk_stamp); 490 } 491 err = 0; 492 if (put_user(ts.tv_sec, &ctv->tv_sec) || 493 put_user(ts.tv_nsec, &ctv->tv_nsec)) 494 err = -EFAULT; 495 return err; 496 } 497 EXPORT_SYMBOL(compat_sock_get_timestampns); 498 499 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 500 char __user *, optval, int __user *, optlen) 501 { 502 int err; 503 struct socket *sock = sockfd_lookup(fd, &err); 504 505 if (sock) { 506 err = security_socket_getsockopt(sock, level, optname); 507 if (err) { 508 sockfd_put(sock); 509 return err; 510 } 511 512 if (level == SOL_SOCKET) 513 err = compat_sock_getsockopt(sock, level, 514 optname, optval, optlen); 515 else if (sock->ops->compat_getsockopt) 516 err = sock->ops->compat_getsockopt(sock, level, 517 optname, optval, optlen); 518 else 519 err = sock->ops->getsockopt(sock, level, 520 optname, optval, optlen); 521 sockfd_put(sock); 522 } 523 return err; 524 } 525 526 struct compat_group_req { 527 __u32 gr_interface; 528 struct __kernel_sockaddr_storage gr_group 529 __aligned(4); 530 } __packed; 531 532 struct compat_group_source_req { 533 __u32 gsr_interface; 534 struct __kernel_sockaddr_storage gsr_group 535 __aligned(4); 536 struct __kernel_sockaddr_storage gsr_source 537 __aligned(4); 538 } __packed; 539 540 struct compat_group_filter { 541 __u32 gf_interface; 542 struct __kernel_sockaddr_storage gf_group 543 __aligned(4); 544 __u32 gf_fmode; 545 __u32 gf_numsrc; 546 struct __kernel_sockaddr_storage gf_slist[1] 547 __aligned(4); 548 } __packed; 549 550 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 551 sizeof(struct __kernel_sockaddr_storage)) 552 553 554 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 555 char __user *optval, unsigned int optlen, 556 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 557 { 558 char __user *koptval = optval; 559 int koptlen = optlen; 560 561 switch (optname) { 562 case MCAST_JOIN_GROUP: 563 case MCAST_LEAVE_GROUP: 564 { 565 struct compat_group_req __user *gr32 = (void *)optval; 566 struct group_req __user *kgr = 567 compat_alloc_user_space(sizeof(struct group_req)); 568 u32 interface; 569 570 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 571 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 572 __get_user(interface, &gr32->gr_interface) || 573 __put_user(interface, &kgr->gr_interface) || 574 copy_in_user(&kgr->gr_group, &gr32->gr_group, 575 sizeof(kgr->gr_group))) 576 return -EFAULT; 577 koptval = (char __user *)kgr; 578 koptlen = sizeof(struct group_req); 579 break; 580 } 581 case MCAST_JOIN_SOURCE_GROUP: 582 case MCAST_LEAVE_SOURCE_GROUP: 583 case MCAST_BLOCK_SOURCE: 584 case MCAST_UNBLOCK_SOURCE: 585 { 586 struct compat_group_source_req __user *gsr32 = (void *)optval; 587 struct group_source_req __user *kgsr = compat_alloc_user_space( 588 sizeof(struct group_source_req)); 589 u32 interface; 590 591 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 592 !access_ok(VERIFY_WRITE, kgsr, 593 sizeof(struct group_source_req)) || 594 __get_user(interface, &gsr32->gsr_interface) || 595 __put_user(interface, &kgsr->gsr_interface) || 596 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 597 sizeof(kgsr->gsr_group)) || 598 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 599 sizeof(kgsr->gsr_source))) 600 return -EFAULT; 601 koptval = (char __user *)kgsr; 602 koptlen = sizeof(struct group_source_req); 603 break; 604 } 605 case MCAST_MSFILTER: 606 { 607 struct compat_group_filter __user *gf32 = (void *)optval; 608 struct group_filter __user *kgf; 609 u32 interface, fmode, numsrc; 610 611 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 612 __get_user(interface, &gf32->gf_interface) || 613 __get_user(fmode, &gf32->gf_fmode) || 614 __get_user(numsrc, &gf32->gf_numsrc)) 615 return -EFAULT; 616 koptlen = optlen + sizeof(struct group_filter) - 617 sizeof(struct compat_group_filter); 618 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 619 return -EINVAL; 620 kgf = compat_alloc_user_space(koptlen); 621 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 622 __put_user(interface, &kgf->gf_interface) || 623 __put_user(fmode, &kgf->gf_fmode) || 624 __put_user(numsrc, &kgf->gf_numsrc) || 625 copy_in_user(&kgf->gf_group, &gf32->gf_group, 626 sizeof(kgf->gf_group)) || 627 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 628 numsrc * sizeof(kgf->gf_slist[0])))) 629 return -EFAULT; 630 koptval = (char __user *)kgf; 631 break; 632 } 633 634 default: 635 break; 636 } 637 return setsockopt(sock, level, optname, koptval, koptlen); 638 } 639 EXPORT_SYMBOL(compat_mc_setsockopt); 640 641 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 642 char __user *optval, int __user *optlen, 643 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 644 { 645 struct compat_group_filter __user *gf32 = (void *)optval; 646 struct group_filter __user *kgf; 647 int __user *koptlen; 648 u32 interface, fmode, numsrc; 649 int klen, ulen, err; 650 651 if (optname != MCAST_MSFILTER) 652 return getsockopt(sock, level, optname, optval, optlen); 653 654 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 655 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 656 __get_user(ulen, optlen)) 657 return -EFAULT; 658 659 /* adjust len for pad */ 660 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 661 662 if (klen < GROUP_FILTER_SIZE(0)) 663 return -EINVAL; 664 665 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 666 __put_user(klen, koptlen)) 667 return -EFAULT; 668 669 /* have to allow space for previous compat_alloc_user_space, too */ 670 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 671 672 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 673 __get_user(interface, &gf32->gf_interface) || 674 __get_user(fmode, &gf32->gf_fmode) || 675 __get_user(numsrc, &gf32->gf_numsrc) || 676 __put_user(interface, &kgf->gf_interface) || 677 __put_user(fmode, &kgf->gf_fmode) || 678 __put_user(numsrc, &kgf->gf_numsrc) || 679 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 680 return -EFAULT; 681 682 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 683 if (err) 684 return err; 685 686 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 687 __get_user(klen, koptlen)) 688 return -EFAULT; 689 690 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 691 692 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 693 __put_user(ulen, optlen)) 694 return -EFAULT; 695 696 if (!access_ok(VERIFY_READ, kgf, klen) || 697 !access_ok(VERIFY_WRITE, gf32, ulen) || 698 __get_user(interface, &kgf->gf_interface) || 699 __get_user(fmode, &kgf->gf_fmode) || 700 __get_user(numsrc, &kgf->gf_numsrc) || 701 __put_user(interface, &gf32->gf_interface) || 702 __put_user(fmode, &gf32->gf_fmode) || 703 __put_user(numsrc, &gf32->gf_numsrc)) 704 return -EFAULT; 705 if (numsrc) { 706 int copylen; 707 708 klen -= GROUP_FILTER_SIZE(0); 709 copylen = numsrc * sizeof(gf32->gf_slist[0]); 710 if (copylen > klen) 711 copylen = klen; 712 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 713 return -EFAULT; 714 } 715 return err; 716 } 717 EXPORT_SYMBOL(compat_mc_getsockopt); 718 719 720 /* Argument list sizes for compat_sys_socketcall */ 721 #define AL(x) ((x) * sizeof(u32)) 722 static unsigned char nas[21] = { 723 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 724 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 725 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 726 AL(4), AL(5), AL(4) 727 }; 728 #undef AL 729 730 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 731 { 732 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 733 } 734 735 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 736 unsigned int, vlen, unsigned int, flags) 737 { 738 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 739 flags | MSG_CMSG_COMPAT); 740 } 741 742 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 743 { 744 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 745 } 746 747 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 748 { 749 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 750 } 751 752 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 753 unsigned int, flags, struct sockaddr __user *, addr, 754 int __user *, addrlen) 755 { 756 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 757 } 758 759 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 760 unsigned int, vlen, unsigned int, flags, 761 struct compat_timespec __user *, timeout) 762 { 763 int datagrams; 764 struct timespec ktspec; 765 766 if (timeout == NULL) 767 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 768 flags | MSG_CMSG_COMPAT, NULL); 769 770 if (compat_get_timespec(&ktspec, timeout)) 771 return -EFAULT; 772 773 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 774 flags | MSG_CMSG_COMPAT, &ktspec); 775 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 776 datagrams = -EFAULT; 777 778 return datagrams; 779 } 780 781 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 782 { 783 u32 a[AUDITSC_ARGS]; 784 unsigned int len; 785 u32 a0, a1; 786 int ret; 787 788 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 789 return -EINVAL; 790 len = nas[call]; 791 if (len > sizeof(a)) 792 return -EINVAL; 793 794 if (copy_from_user(a, args, len)) 795 return -EFAULT; 796 797 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 798 if (ret) 799 return ret; 800 801 a0 = a[0]; 802 a1 = a[1]; 803 804 switch (call) { 805 case SYS_SOCKET: 806 ret = sys_socket(a0, a1, a[2]); 807 break; 808 case SYS_BIND: 809 ret = sys_bind(a0, compat_ptr(a1), a[2]); 810 break; 811 case SYS_CONNECT: 812 ret = sys_connect(a0, compat_ptr(a1), a[2]); 813 break; 814 case SYS_LISTEN: 815 ret = sys_listen(a0, a1); 816 break; 817 case SYS_ACCEPT: 818 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 819 break; 820 case SYS_GETSOCKNAME: 821 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 822 break; 823 case SYS_GETPEERNAME: 824 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 825 break; 826 case SYS_SOCKETPAIR: 827 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 828 break; 829 case SYS_SEND: 830 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 831 break; 832 case SYS_SENDTO: 833 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 834 break; 835 case SYS_RECV: 836 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 837 break; 838 case SYS_RECVFROM: 839 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 840 compat_ptr(a[4]), compat_ptr(a[5])); 841 break; 842 case SYS_SHUTDOWN: 843 ret = sys_shutdown(a0, a1); 844 break; 845 case SYS_SETSOCKOPT: 846 ret = compat_sys_setsockopt(a0, a1, a[2], 847 compat_ptr(a[3]), a[4]); 848 break; 849 case SYS_GETSOCKOPT: 850 ret = compat_sys_getsockopt(a0, a1, a[2], 851 compat_ptr(a[3]), compat_ptr(a[4])); 852 break; 853 case SYS_SENDMSG: 854 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 855 break; 856 case SYS_SENDMMSG: 857 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 858 break; 859 case SYS_RECVMSG: 860 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 861 break; 862 case SYS_RECVMMSG: 863 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 864 compat_ptr(a[4])); 865 break; 866 case SYS_ACCEPT4: 867 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 868 break; 869 default: 870 ret = -EINVAL; 871 break; 872 } 873 return ret; 874 } 875