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 /* 189 * check the length of messages copied in is the same as the 190 * what we get from the first loop 191 */ 192 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen) 193 goto Einval; 194 195 /* Ok, looks like we made it. Hook it up and return success. */ 196 kmsg->msg_control = kcmsg_base; 197 kmsg->msg_controllen = kcmlen; 198 return 0; 199 200 Einval: 201 err = -EINVAL; 202 Efault: 203 if (kcmsg_base != (struct cmsghdr *)stackbuf) 204 sock_kfree_s(sk, kcmsg_base, kcmlen); 205 return err; 206 } 207 208 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 209 { 210 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 211 struct compat_cmsghdr cmhdr; 212 struct compat_timeval ctv; 213 struct compat_timespec cts[3]; 214 int cmlen; 215 216 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 217 kmsg->msg_flags |= MSG_CTRUNC; 218 return 0; /* XXX: return error? check spec. */ 219 } 220 221 if (!COMPAT_USE_64BIT_TIME) { 222 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 223 struct timeval *tv = (struct timeval *)data; 224 ctv.tv_sec = tv->tv_sec; 225 ctv.tv_usec = tv->tv_usec; 226 data = &ctv; 227 len = sizeof(ctv); 228 } 229 if (level == SOL_SOCKET && 230 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 231 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 232 int i; 233 struct timespec *ts = (struct timespec *)data; 234 for (i = 0; i < count; i++) { 235 cts[i].tv_sec = ts[i].tv_sec; 236 cts[i].tv_nsec = ts[i].tv_nsec; 237 } 238 data = &cts; 239 len = sizeof(cts[0]) * count; 240 } 241 } 242 243 cmlen = CMSG_COMPAT_LEN(len); 244 if (kmsg->msg_controllen < cmlen) { 245 kmsg->msg_flags |= MSG_CTRUNC; 246 cmlen = kmsg->msg_controllen; 247 } 248 cmhdr.cmsg_level = level; 249 cmhdr.cmsg_type = type; 250 cmhdr.cmsg_len = cmlen; 251 252 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 253 return -EFAULT; 254 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 255 return -EFAULT; 256 cmlen = CMSG_COMPAT_SPACE(len); 257 if (kmsg->msg_controllen < cmlen) 258 cmlen = kmsg->msg_controllen; 259 kmsg->msg_control += cmlen; 260 kmsg->msg_controllen -= cmlen; 261 return 0; 262 } 263 264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 265 { 266 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 267 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 268 int fdnum = scm->fp->count; 269 struct file **fp = scm->fp->fp; 270 int __user *cmfptr; 271 int err = 0, i; 272 273 if (fdnum < fdmax) 274 fdmax = fdnum; 275 276 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 277 int new_fd; 278 err = security_file_receive(fp[i]); 279 if (err) 280 break; 281 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 282 ? O_CLOEXEC : 0); 283 if (err < 0) 284 break; 285 new_fd = err; 286 err = put_user(new_fd, cmfptr); 287 if (err) { 288 put_unused_fd(new_fd); 289 break; 290 } 291 /* Bump the usage count and install the file. */ 292 fd_install(new_fd, get_file(fp[i])); 293 } 294 295 if (i > 0) { 296 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 297 err = put_user(SOL_SOCKET, &cm->cmsg_level); 298 if (!err) 299 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 300 if (!err) 301 err = put_user(cmlen, &cm->cmsg_len); 302 if (!err) { 303 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 304 kmsg->msg_control += cmlen; 305 kmsg->msg_controllen -= cmlen; 306 } 307 } 308 if (i < fdnum) 309 kmsg->msg_flags |= MSG_CTRUNC; 310 311 /* 312 * All of the files that fit in the message have had their 313 * usage counts incremented, so we just free the list. 314 */ 315 __scm_destroy(scm); 316 } 317 318 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 319 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 320 { 321 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 322 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 323 struct compat_sock_fprog f32; 324 struct sock_fprog f; 325 326 if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) 327 return NULL; 328 memset(&f, 0, sizeof(f)); 329 f.len = f32.len; 330 f.filter = compat_ptr(f32.filter); 331 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) 332 return NULL; 333 334 return kfprog; 335 } 336 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 337 338 static int do_set_attach_filter(struct socket *sock, int level, int optname, 339 char __user *optval, unsigned int optlen) 340 { 341 struct sock_fprog __user *kfprog; 342 343 kfprog = get_compat_bpf_fprog(optval); 344 if (!kfprog) 345 return -EFAULT; 346 347 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 348 sizeof(struct sock_fprog)); 349 } 350 351 static int do_set_sock_timeout(struct socket *sock, int level, 352 int optname, char __user *optval, unsigned int optlen) 353 { 354 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 355 struct timeval ktime; 356 mm_segment_t old_fs; 357 int err; 358 359 if (optlen < sizeof(*up)) 360 return -EINVAL; 361 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 362 __get_user(ktime.tv_sec, &up->tv_sec) || 363 __get_user(ktime.tv_usec, &up->tv_usec)) 364 return -EFAULT; 365 old_fs = get_fs(); 366 set_fs(KERNEL_DS); 367 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 368 set_fs(old_fs); 369 370 return err; 371 } 372 373 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 374 char __user *optval, unsigned int optlen) 375 { 376 if (optname == SO_ATTACH_FILTER || 377 optname == SO_ATTACH_REUSEPORT_CBPF) 378 return do_set_attach_filter(sock, level, optname, 379 optval, optlen); 380 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 381 return do_set_sock_timeout(sock, level, optname, optval, optlen); 382 383 return sock_setsockopt(sock, level, optname, optval, optlen); 384 } 385 386 static int __compat_sys_setsockopt(int fd, int level, int optname, 387 char __user *optval, unsigned int optlen) 388 { 389 int err; 390 struct socket *sock = sockfd_lookup(fd, &err); 391 392 if (sock) { 393 err = security_socket_setsockopt(sock, level, optname); 394 if (err) { 395 sockfd_put(sock); 396 return err; 397 } 398 399 if (level == SOL_SOCKET) 400 err = compat_sock_setsockopt(sock, level, 401 optname, optval, optlen); 402 else if (sock->ops->compat_setsockopt) 403 err = sock->ops->compat_setsockopt(sock, level, 404 optname, optval, optlen); 405 else 406 err = sock->ops->setsockopt(sock, level, 407 optname, optval, optlen); 408 sockfd_put(sock); 409 } 410 return err; 411 } 412 413 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 414 char __user *, optval, unsigned int, optlen) 415 { 416 return __compat_sys_setsockopt(fd, level, optname, optval, optlen); 417 } 418 419 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 420 char __user *optval, int __user *optlen) 421 { 422 struct compat_timeval __user *up; 423 struct timeval ktime; 424 mm_segment_t old_fs; 425 int len, err; 426 427 up = (struct compat_timeval __user *) optval; 428 if (get_user(len, optlen)) 429 return -EFAULT; 430 if (len < sizeof(*up)) 431 return -EINVAL; 432 len = sizeof(ktime); 433 old_fs = get_fs(); 434 set_fs(KERNEL_DS); 435 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 436 set_fs(old_fs); 437 438 if (!err) { 439 if (put_user(sizeof(*up), optlen) || 440 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 441 __put_user(ktime.tv_sec, &up->tv_sec) || 442 __put_user(ktime.tv_usec, &up->tv_usec)) 443 err = -EFAULT; 444 } 445 return err; 446 } 447 448 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 449 char __user *optval, int __user *optlen) 450 { 451 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 452 return do_get_sock_timeout(sock, level, optname, optval, optlen); 453 return sock_getsockopt(sock, level, optname, optval, optlen); 454 } 455 456 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 457 { 458 struct compat_timeval __user *ctv; 459 int err; 460 struct timeval tv; 461 462 if (COMPAT_USE_64BIT_TIME) 463 return sock_get_timestamp(sk, userstamp); 464 465 ctv = (struct compat_timeval __user *) userstamp; 466 err = -ENOENT; 467 if (!sock_flag(sk, SOCK_TIMESTAMP)) 468 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 469 tv = ktime_to_timeval(sk->sk_stamp); 470 if (tv.tv_sec == -1) 471 return err; 472 if (tv.tv_sec == 0) { 473 sk->sk_stamp = ktime_get_real(); 474 tv = ktime_to_timeval(sk->sk_stamp); 475 } 476 err = 0; 477 if (put_user(tv.tv_sec, &ctv->tv_sec) || 478 put_user(tv.tv_usec, &ctv->tv_usec)) 479 err = -EFAULT; 480 return err; 481 } 482 EXPORT_SYMBOL(compat_sock_get_timestamp); 483 484 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 485 { 486 struct compat_timespec __user *ctv; 487 int err; 488 struct timespec ts; 489 490 if (COMPAT_USE_64BIT_TIME) 491 return sock_get_timestampns (sk, userstamp); 492 493 ctv = (struct compat_timespec __user *) userstamp; 494 err = -ENOENT; 495 if (!sock_flag(sk, SOCK_TIMESTAMP)) 496 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 497 ts = ktime_to_timespec(sk->sk_stamp); 498 if (ts.tv_sec == -1) 499 return err; 500 if (ts.tv_sec == 0) { 501 sk->sk_stamp = ktime_get_real(); 502 ts = ktime_to_timespec(sk->sk_stamp); 503 } 504 err = 0; 505 if (put_user(ts.tv_sec, &ctv->tv_sec) || 506 put_user(ts.tv_nsec, &ctv->tv_nsec)) 507 err = -EFAULT; 508 return err; 509 } 510 EXPORT_SYMBOL(compat_sock_get_timestampns); 511 512 static int __compat_sys_getsockopt(int fd, int level, int optname, 513 char __user *optval, 514 int __user *optlen) 515 { 516 int err; 517 struct socket *sock = sockfd_lookup(fd, &err); 518 519 if (sock) { 520 err = security_socket_getsockopt(sock, level, optname); 521 if (err) { 522 sockfd_put(sock); 523 return err; 524 } 525 526 if (level == SOL_SOCKET) 527 err = compat_sock_getsockopt(sock, level, 528 optname, optval, optlen); 529 else if (sock->ops->compat_getsockopt) 530 err = sock->ops->compat_getsockopt(sock, level, 531 optname, optval, optlen); 532 else 533 err = sock->ops->getsockopt(sock, level, 534 optname, optval, optlen); 535 sockfd_put(sock); 536 } 537 return err; 538 } 539 540 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 541 char __user *, optval, int __user *, optlen) 542 { 543 return __compat_sys_getsockopt(fd, level, optname, optval, optlen); 544 } 545 546 struct compat_group_req { 547 __u32 gr_interface; 548 struct __kernel_sockaddr_storage gr_group 549 __aligned(4); 550 } __packed; 551 552 struct compat_group_source_req { 553 __u32 gsr_interface; 554 struct __kernel_sockaddr_storage gsr_group 555 __aligned(4); 556 struct __kernel_sockaddr_storage gsr_source 557 __aligned(4); 558 } __packed; 559 560 struct compat_group_filter { 561 __u32 gf_interface; 562 struct __kernel_sockaddr_storage gf_group 563 __aligned(4); 564 __u32 gf_fmode; 565 __u32 gf_numsrc; 566 struct __kernel_sockaddr_storage gf_slist[1] 567 __aligned(4); 568 } __packed; 569 570 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 571 sizeof(struct __kernel_sockaddr_storage)) 572 573 574 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 575 char __user *optval, unsigned int optlen, 576 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 577 { 578 char __user *koptval = optval; 579 int koptlen = optlen; 580 581 switch (optname) { 582 case MCAST_JOIN_GROUP: 583 case MCAST_LEAVE_GROUP: 584 { 585 struct compat_group_req __user *gr32 = (void *)optval; 586 struct group_req __user *kgr = 587 compat_alloc_user_space(sizeof(struct group_req)); 588 u32 interface; 589 590 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 591 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 592 __get_user(interface, &gr32->gr_interface) || 593 __put_user(interface, &kgr->gr_interface) || 594 copy_in_user(&kgr->gr_group, &gr32->gr_group, 595 sizeof(kgr->gr_group))) 596 return -EFAULT; 597 koptval = (char __user *)kgr; 598 koptlen = sizeof(struct group_req); 599 break; 600 } 601 case MCAST_JOIN_SOURCE_GROUP: 602 case MCAST_LEAVE_SOURCE_GROUP: 603 case MCAST_BLOCK_SOURCE: 604 case MCAST_UNBLOCK_SOURCE: 605 { 606 struct compat_group_source_req __user *gsr32 = (void *)optval; 607 struct group_source_req __user *kgsr = compat_alloc_user_space( 608 sizeof(struct group_source_req)); 609 u32 interface; 610 611 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 612 !access_ok(VERIFY_WRITE, kgsr, 613 sizeof(struct group_source_req)) || 614 __get_user(interface, &gsr32->gsr_interface) || 615 __put_user(interface, &kgsr->gsr_interface) || 616 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 617 sizeof(kgsr->gsr_group)) || 618 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 619 sizeof(kgsr->gsr_source))) 620 return -EFAULT; 621 koptval = (char __user *)kgsr; 622 koptlen = sizeof(struct group_source_req); 623 break; 624 } 625 case MCAST_MSFILTER: 626 { 627 struct compat_group_filter __user *gf32 = (void *)optval; 628 struct group_filter __user *kgf; 629 u32 interface, fmode, numsrc; 630 631 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 632 __get_user(interface, &gf32->gf_interface) || 633 __get_user(fmode, &gf32->gf_fmode) || 634 __get_user(numsrc, &gf32->gf_numsrc)) 635 return -EFAULT; 636 koptlen = optlen + sizeof(struct group_filter) - 637 sizeof(struct compat_group_filter); 638 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 639 return -EINVAL; 640 kgf = compat_alloc_user_space(koptlen); 641 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 642 __put_user(interface, &kgf->gf_interface) || 643 __put_user(fmode, &kgf->gf_fmode) || 644 __put_user(numsrc, &kgf->gf_numsrc) || 645 copy_in_user(&kgf->gf_group, &gf32->gf_group, 646 sizeof(kgf->gf_group)) || 647 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 648 numsrc * sizeof(kgf->gf_slist[0])))) 649 return -EFAULT; 650 koptval = (char __user *)kgf; 651 break; 652 } 653 654 default: 655 break; 656 } 657 return setsockopt(sock, level, optname, koptval, koptlen); 658 } 659 EXPORT_SYMBOL(compat_mc_setsockopt); 660 661 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 662 char __user *optval, int __user *optlen, 663 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 664 { 665 struct compat_group_filter __user *gf32 = (void *)optval; 666 struct group_filter __user *kgf; 667 int __user *koptlen; 668 u32 interface, fmode, numsrc; 669 int klen, ulen, err; 670 671 if (optname != MCAST_MSFILTER) 672 return getsockopt(sock, level, optname, optval, optlen); 673 674 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 675 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 676 __get_user(ulen, optlen)) 677 return -EFAULT; 678 679 /* adjust len for pad */ 680 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 681 682 if (klen < GROUP_FILTER_SIZE(0)) 683 return -EINVAL; 684 685 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 686 __put_user(klen, koptlen)) 687 return -EFAULT; 688 689 /* have to allow space for previous compat_alloc_user_space, too */ 690 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 691 692 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 693 __get_user(interface, &gf32->gf_interface) || 694 __get_user(fmode, &gf32->gf_fmode) || 695 __get_user(numsrc, &gf32->gf_numsrc) || 696 __put_user(interface, &kgf->gf_interface) || 697 __put_user(fmode, &kgf->gf_fmode) || 698 __put_user(numsrc, &kgf->gf_numsrc) || 699 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 700 return -EFAULT; 701 702 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 703 if (err) 704 return err; 705 706 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 707 __get_user(klen, koptlen)) 708 return -EFAULT; 709 710 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 711 712 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 713 __put_user(ulen, optlen)) 714 return -EFAULT; 715 716 if (!access_ok(VERIFY_READ, kgf, klen) || 717 !access_ok(VERIFY_WRITE, gf32, ulen) || 718 __get_user(interface, &kgf->gf_interface) || 719 __get_user(fmode, &kgf->gf_fmode) || 720 __get_user(numsrc, &kgf->gf_numsrc) || 721 __put_user(interface, &gf32->gf_interface) || 722 __put_user(fmode, &gf32->gf_fmode) || 723 __put_user(numsrc, &gf32->gf_numsrc)) 724 return -EFAULT; 725 if (numsrc) { 726 int copylen; 727 728 klen -= GROUP_FILTER_SIZE(0); 729 copylen = numsrc * sizeof(gf32->gf_slist[0]); 730 if (copylen > klen) 731 copylen = klen; 732 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 733 return -EFAULT; 734 } 735 return err; 736 } 737 EXPORT_SYMBOL(compat_mc_getsockopt); 738 739 740 /* Argument list sizes for compat_sys_socketcall */ 741 #define AL(x) ((x) * sizeof(u32)) 742 static unsigned char nas[21] = { 743 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 744 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 745 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 746 AL(4), AL(5), AL(4) 747 }; 748 #undef AL 749 750 static inline long __compat_sys_sendmsg(int fd, 751 struct compat_msghdr __user *msg, 752 unsigned int flags) 753 { 754 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, 755 flags | MSG_CMSG_COMPAT, false); 756 } 757 758 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, 759 unsigned int, flags) 760 { 761 return __compat_sys_sendmsg(fd, msg, flags); 762 } 763 764 static inline long __compat_sys_sendmmsg(int fd, 765 struct compat_mmsghdr __user *mmsg, 766 unsigned int vlen, unsigned int flags) 767 { 768 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 769 flags | MSG_CMSG_COMPAT, false); 770 } 771 772 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 773 unsigned int, vlen, unsigned int, flags) 774 { 775 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); 776 } 777 778 static inline long __compat_sys_recvmsg(int fd, 779 struct compat_msghdr __user *msg, 780 unsigned int flags) 781 { 782 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, 783 flags | MSG_CMSG_COMPAT, false); 784 } 785 786 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, 787 unsigned int, flags) 788 { 789 return __compat_sys_recvmsg(fd, msg, flags); 790 } 791 792 static inline long __compat_sys_recvfrom(int fd, void __user *buf, 793 compat_size_t len, unsigned int flags, 794 struct sockaddr __user *addr, 795 int __user *addrlen) 796 { 797 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, 798 addrlen); 799 } 800 801 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 802 { 803 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); 804 } 805 806 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 807 unsigned int, flags, struct sockaddr __user *, addr, 808 int __user *, addrlen) 809 { 810 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); 811 } 812 813 static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, 814 unsigned int vlen, unsigned int flags, 815 struct compat_timespec __user *timeout) 816 { 817 int datagrams; 818 struct timespec ktspec; 819 820 if (timeout == NULL) 821 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 822 flags | MSG_CMSG_COMPAT, NULL); 823 824 if (compat_get_timespec(&ktspec, timeout)) 825 return -EFAULT; 826 827 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 828 flags | MSG_CMSG_COMPAT, &ktspec); 829 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 830 datagrams = -EFAULT; 831 832 return datagrams; 833 } 834 835 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 836 unsigned int, vlen, unsigned int, flags, 837 struct compat_timespec __user *, timeout) 838 { 839 return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout); 840 } 841 842 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 843 { 844 u32 a[AUDITSC_ARGS]; 845 unsigned int len; 846 u32 a0, a1; 847 int ret; 848 849 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 850 return -EINVAL; 851 len = nas[call]; 852 if (len > sizeof(a)) 853 return -EINVAL; 854 855 if (copy_from_user(a, args, len)) 856 return -EFAULT; 857 858 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 859 if (ret) 860 return ret; 861 862 a0 = a[0]; 863 a1 = a[1]; 864 865 switch (call) { 866 case SYS_SOCKET: 867 ret = __sys_socket(a0, a1, a[2]); 868 break; 869 case SYS_BIND: 870 ret = __sys_bind(a0, compat_ptr(a1), a[2]); 871 break; 872 case SYS_CONNECT: 873 ret = __sys_connect(a0, compat_ptr(a1), a[2]); 874 break; 875 case SYS_LISTEN: 876 ret = __sys_listen(a0, a1); 877 break; 878 case SYS_ACCEPT: 879 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 880 break; 881 case SYS_GETSOCKNAME: 882 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 883 break; 884 case SYS_GETPEERNAME: 885 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 886 break; 887 case SYS_SOCKETPAIR: 888 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 889 break; 890 case SYS_SEND: 891 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); 892 break; 893 case SYS_SENDTO: 894 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], 895 compat_ptr(a[4]), a[5]); 896 break; 897 case SYS_RECV: 898 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 899 NULL, NULL); 900 break; 901 case SYS_RECVFROM: 902 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 903 compat_ptr(a[4]), 904 compat_ptr(a[5])); 905 break; 906 case SYS_SHUTDOWN: 907 ret = __sys_shutdown(a0, a1); 908 break; 909 case SYS_SETSOCKOPT: 910 ret = __compat_sys_setsockopt(a0, a1, a[2], 911 compat_ptr(a[3]), a[4]); 912 break; 913 case SYS_GETSOCKOPT: 914 ret = __compat_sys_getsockopt(a0, a1, a[2], 915 compat_ptr(a[3]), 916 compat_ptr(a[4])); 917 break; 918 case SYS_SENDMSG: 919 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 920 break; 921 case SYS_SENDMMSG: 922 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 923 break; 924 case SYS_RECVMSG: 925 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 926 break; 927 case SYS_RECVMMSG: 928 ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 929 compat_ptr(a[4])); 930 break; 931 case SYS_ACCEPT4: 932 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 933 break; 934 default: 935 ret = -EINVAL; 936 break; 937 } 938 return ret; 939 } 940