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 (!COMPAT_USE_64BIT_TIME && 381 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) 382 return do_set_sock_timeout(sock, level, optname, optval, optlen); 383 384 return sock_setsockopt(sock, level, optname, optval, optlen); 385 } 386 387 static int __compat_sys_setsockopt(int fd, int level, int optname, 388 char __user *optval, unsigned int optlen) 389 { 390 int err; 391 struct socket *sock = sockfd_lookup(fd, &err); 392 393 if (sock) { 394 err = security_socket_setsockopt(sock, level, optname); 395 if (err) { 396 sockfd_put(sock); 397 return err; 398 } 399 400 if (level == SOL_SOCKET) 401 err = compat_sock_setsockopt(sock, level, 402 optname, optval, optlen); 403 else if (sock->ops->compat_setsockopt) 404 err = sock->ops->compat_setsockopt(sock, level, 405 optname, optval, optlen); 406 else 407 err = sock->ops->setsockopt(sock, level, 408 optname, optval, optlen); 409 sockfd_put(sock); 410 } 411 return err; 412 } 413 414 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 415 char __user *, optval, unsigned int, optlen) 416 { 417 return __compat_sys_setsockopt(fd, level, optname, optval, optlen); 418 } 419 420 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 421 char __user *optval, int __user *optlen) 422 { 423 struct compat_timeval __user *up; 424 struct timeval ktime; 425 mm_segment_t old_fs; 426 int len, err; 427 428 up = (struct compat_timeval __user *) optval; 429 if (get_user(len, optlen)) 430 return -EFAULT; 431 if (len < sizeof(*up)) 432 return -EINVAL; 433 len = sizeof(ktime); 434 old_fs = get_fs(); 435 set_fs(KERNEL_DS); 436 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 437 set_fs(old_fs); 438 439 if (!err) { 440 if (put_user(sizeof(*up), optlen) || 441 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 442 __put_user(ktime.tv_sec, &up->tv_sec) || 443 __put_user(ktime.tv_usec, &up->tv_usec)) 444 err = -EFAULT; 445 } 446 return err; 447 } 448 449 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 450 char __user *optval, int __user *optlen) 451 { 452 if (!COMPAT_USE_64BIT_TIME && 453 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) 454 return do_get_sock_timeout(sock, level, optname, optval, optlen); 455 return sock_getsockopt(sock, level, optname, optval, optlen); 456 } 457 458 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 459 { 460 struct compat_timeval __user *ctv; 461 int err; 462 struct timeval tv; 463 464 if (COMPAT_USE_64BIT_TIME) 465 return sock_get_timestamp(sk, userstamp); 466 467 ctv = (struct compat_timeval __user *) userstamp; 468 err = -ENOENT; 469 if (!sock_flag(sk, SOCK_TIMESTAMP)) 470 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 471 tv = ktime_to_timeval(sk->sk_stamp); 472 if (tv.tv_sec == -1) 473 return err; 474 if (tv.tv_sec == 0) { 475 sk->sk_stamp = ktime_get_real(); 476 tv = ktime_to_timeval(sk->sk_stamp); 477 } 478 err = 0; 479 if (put_user(tv.tv_sec, &ctv->tv_sec) || 480 put_user(tv.tv_usec, &ctv->tv_usec)) 481 err = -EFAULT; 482 return err; 483 } 484 EXPORT_SYMBOL(compat_sock_get_timestamp); 485 486 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 487 { 488 struct compat_timespec __user *ctv; 489 int err; 490 struct timespec ts; 491 492 if (COMPAT_USE_64BIT_TIME) 493 return sock_get_timestampns (sk, userstamp); 494 495 ctv = (struct compat_timespec __user *) userstamp; 496 err = -ENOENT; 497 if (!sock_flag(sk, SOCK_TIMESTAMP)) 498 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 499 ts = ktime_to_timespec(sk->sk_stamp); 500 if (ts.tv_sec == -1) 501 return err; 502 if (ts.tv_sec == 0) { 503 sk->sk_stamp = ktime_get_real(); 504 ts = ktime_to_timespec(sk->sk_stamp); 505 } 506 err = 0; 507 if (put_user(ts.tv_sec, &ctv->tv_sec) || 508 put_user(ts.tv_nsec, &ctv->tv_nsec)) 509 err = -EFAULT; 510 return err; 511 } 512 EXPORT_SYMBOL(compat_sock_get_timestampns); 513 514 static int __compat_sys_getsockopt(int fd, int level, int optname, 515 char __user *optval, 516 int __user *optlen) 517 { 518 int err; 519 struct socket *sock = sockfd_lookup(fd, &err); 520 521 if (sock) { 522 err = security_socket_getsockopt(sock, level, optname); 523 if (err) { 524 sockfd_put(sock); 525 return err; 526 } 527 528 if (level == SOL_SOCKET) 529 err = compat_sock_getsockopt(sock, level, 530 optname, optval, optlen); 531 else if (sock->ops->compat_getsockopt) 532 err = sock->ops->compat_getsockopt(sock, level, 533 optname, optval, optlen); 534 else 535 err = sock->ops->getsockopt(sock, level, 536 optname, optval, optlen); 537 sockfd_put(sock); 538 } 539 return err; 540 } 541 542 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 543 char __user *, optval, int __user *, optlen) 544 { 545 return __compat_sys_getsockopt(fd, level, optname, optval, optlen); 546 } 547 548 struct compat_group_req { 549 __u32 gr_interface; 550 struct __kernel_sockaddr_storage gr_group 551 __aligned(4); 552 } __packed; 553 554 struct compat_group_source_req { 555 __u32 gsr_interface; 556 struct __kernel_sockaddr_storage gsr_group 557 __aligned(4); 558 struct __kernel_sockaddr_storage gsr_source 559 __aligned(4); 560 } __packed; 561 562 struct compat_group_filter { 563 __u32 gf_interface; 564 struct __kernel_sockaddr_storage gf_group 565 __aligned(4); 566 __u32 gf_fmode; 567 __u32 gf_numsrc; 568 struct __kernel_sockaddr_storage gf_slist[1] 569 __aligned(4); 570 } __packed; 571 572 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 573 sizeof(struct __kernel_sockaddr_storage)) 574 575 576 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 577 char __user *optval, unsigned int optlen, 578 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 579 { 580 char __user *koptval = optval; 581 int koptlen = optlen; 582 583 switch (optname) { 584 case MCAST_JOIN_GROUP: 585 case MCAST_LEAVE_GROUP: 586 { 587 struct compat_group_req __user *gr32 = (void *)optval; 588 struct group_req __user *kgr = 589 compat_alloc_user_space(sizeof(struct group_req)); 590 u32 interface; 591 592 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 593 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 594 __get_user(interface, &gr32->gr_interface) || 595 __put_user(interface, &kgr->gr_interface) || 596 copy_in_user(&kgr->gr_group, &gr32->gr_group, 597 sizeof(kgr->gr_group))) 598 return -EFAULT; 599 koptval = (char __user *)kgr; 600 koptlen = sizeof(struct group_req); 601 break; 602 } 603 case MCAST_JOIN_SOURCE_GROUP: 604 case MCAST_LEAVE_SOURCE_GROUP: 605 case MCAST_BLOCK_SOURCE: 606 case MCAST_UNBLOCK_SOURCE: 607 { 608 struct compat_group_source_req __user *gsr32 = (void *)optval; 609 struct group_source_req __user *kgsr = compat_alloc_user_space( 610 sizeof(struct group_source_req)); 611 u32 interface; 612 613 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 614 !access_ok(VERIFY_WRITE, kgsr, 615 sizeof(struct group_source_req)) || 616 __get_user(interface, &gsr32->gsr_interface) || 617 __put_user(interface, &kgsr->gsr_interface) || 618 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 619 sizeof(kgsr->gsr_group)) || 620 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 621 sizeof(kgsr->gsr_source))) 622 return -EFAULT; 623 koptval = (char __user *)kgsr; 624 koptlen = sizeof(struct group_source_req); 625 break; 626 } 627 case MCAST_MSFILTER: 628 { 629 struct compat_group_filter __user *gf32 = (void *)optval; 630 struct group_filter __user *kgf; 631 u32 interface, fmode, numsrc; 632 633 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 634 __get_user(interface, &gf32->gf_interface) || 635 __get_user(fmode, &gf32->gf_fmode) || 636 __get_user(numsrc, &gf32->gf_numsrc)) 637 return -EFAULT; 638 koptlen = optlen + sizeof(struct group_filter) - 639 sizeof(struct compat_group_filter); 640 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 641 return -EINVAL; 642 kgf = compat_alloc_user_space(koptlen); 643 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 644 __put_user(interface, &kgf->gf_interface) || 645 __put_user(fmode, &kgf->gf_fmode) || 646 __put_user(numsrc, &kgf->gf_numsrc) || 647 copy_in_user(&kgf->gf_group, &gf32->gf_group, 648 sizeof(kgf->gf_group)) || 649 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 650 numsrc * sizeof(kgf->gf_slist[0])))) 651 return -EFAULT; 652 koptval = (char __user *)kgf; 653 break; 654 } 655 656 default: 657 break; 658 } 659 return setsockopt(sock, level, optname, koptval, koptlen); 660 } 661 EXPORT_SYMBOL(compat_mc_setsockopt); 662 663 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 664 char __user *optval, int __user *optlen, 665 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 666 { 667 struct compat_group_filter __user *gf32 = (void *)optval; 668 struct group_filter __user *kgf; 669 int __user *koptlen; 670 u32 interface, fmode, numsrc; 671 int klen, ulen, err; 672 673 if (optname != MCAST_MSFILTER) 674 return getsockopt(sock, level, optname, optval, optlen); 675 676 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 677 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 678 __get_user(ulen, optlen)) 679 return -EFAULT; 680 681 /* adjust len for pad */ 682 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 683 684 if (klen < GROUP_FILTER_SIZE(0)) 685 return -EINVAL; 686 687 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 688 __put_user(klen, koptlen)) 689 return -EFAULT; 690 691 /* have to allow space for previous compat_alloc_user_space, too */ 692 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 693 694 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 695 __get_user(interface, &gf32->gf_interface) || 696 __get_user(fmode, &gf32->gf_fmode) || 697 __get_user(numsrc, &gf32->gf_numsrc) || 698 __put_user(interface, &kgf->gf_interface) || 699 __put_user(fmode, &kgf->gf_fmode) || 700 __put_user(numsrc, &kgf->gf_numsrc) || 701 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 702 return -EFAULT; 703 704 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 705 if (err) 706 return err; 707 708 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 709 __get_user(klen, koptlen)) 710 return -EFAULT; 711 712 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 713 714 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 715 __put_user(ulen, optlen)) 716 return -EFAULT; 717 718 if (!access_ok(VERIFY_READ, kgf, klen) || 719 !access_ok(VERIFY_WRITE, gf32, ulen) || 720 __get_user(interface, &kgf->gf_interface) || 721 __get_user(fmode, &kgf->gf_fmode) || 722 __get_user(numsrc, &kgf->gf_numsrc) || 723 __put_user(interface, &gf32->gf_interface) || 724 __put_user(fmode, &gf32->gf_fmode) || 725 __put_user(numsrc, &gf32->gf_numsrc)) 726 return -EFAULT; 727 if (numsrc) { 728 int copylen; 729 730 klen -= GROUP_FILTER_SIZE(0); 731 copylen = numsrc * sizeof(gf32->gf_slist[0]); 732 if (copylen > klen) 733 copylen = klen; 734 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 735 return -EFAULT; 736 } 737 return err; 738 } 739 EXPORT_SYMBOL(compat_mc_getsockopt); 740 741 742 /* Argument list sizes for compat_sys_socketcall */ 743 #define AL(x) ((x) * sizeof(u32)) 744 static unsigned char nas[21] = { 745 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 746 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 747 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 748 AL(4), AL(5), AL(4) 749 }; 750 #undef AL 751 752 static inline long __compat_sys_sendmsg(int fd, 753 struct compat_msghdr __user *msg, 754 unsigned int flags) 755 { 756 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, 757 flags | MSG_CMSG_COMPAT, false); 758 } 759 760 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, 761 unsigned int, flags) 762 { 763 return __compat_sys_sendmsg(fd, msg, flags); 764 } 765 766 static inline long __compat_sys_sendmmsg(int fd, 767 struct compat_mmsghdr __user *mmsg, 768 unsigned int vlen, unsigned int flags) 769 { 770 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 771 flags | MSG_CMSG_COMPAT, false); 772 } 773 774 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 775 unsigned int, vlen, unsigned int, flags) 776 { 777 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); 778 } 779 780 static inline long __compat_sys_recvmsg(int fd, 781 struct compat_msghdr __user *msg, 782 unsigned int flags) 783 { 784 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, 785 flags | MSG_CMSG_COMPAT, false); 786 } 787 788 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, 789 unsigned int, flags) 790 { 791 return __compat_sys_recvmsg(fd, msg, flags); 792 } 793 794 static inline long __compat_sys_recvfrom(int fd, void __user *buf, 795 compat_size_t len, unsigned int flags, 796 struct sockaddr __user *addr, 797 int __user *addrlen) 798 { 799 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, 800 addrlen); 801 } 802 803 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 804 { 805 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); 806 } 807 808 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 809 unsigned int, flags, struct sockaddr __user *, addr, 810 int __user *, addrlen) 811 { 812 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); 813 } 814 815 static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, 816 unsigned int vlen, unsigned int flags, 817 struct compat_timespec __user *timeout) 818 { 819 int datagrams; 820 struct timespec ktspec; 821 822 if (timeout == NULL) 823 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 824 flags | MSG_CMSG_COMPAT, NULL); 825 826 if (compat_get_timespec(&ktspec, timeout)) 827 return -EFAULT; 828 829 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 830 flags | MSG_CMSG_COMPAT, &ktspec); 831 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 832 datagrams = -EFAULT; 833 834 return datagrams; 835 } 836 837 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 838 unsigned int, vlen, unsigned int, flags, 839 struct compat_timespec __user *, timeout) 840 { 841 return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout); 842 } 843 844 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 845 { 846 u32 a[AUDITSC_ARGS]; 847 unsigned int len; 848 u32 a0, a1; 849 int ret; 850 851 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 852 return -EINVAL; 853 len = nas[call]; 854 if (len > sizeof(a)) 855 return -EINVAL; 856 857 if (copy_from_user(a, args, len)) 858 return -EFAULT; 859 860 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 861 if (ret) 862 return ret; 863 864 a0 = a[0]; 865 a1 = a[1]; 866 867 switch (call) { 868 case SYS_SOCKET: 869 ret = __sys_socket(a0, a1, a[2]); 870 break; 871 case SYS_BIND: 872 ret = __sys_bind(a0, compat_ptr(a1), a[2]); 873 break; 874 case SYS_CONNECT: 875 ret = __sys_connect(a0, compat_ptr(a1), a[2]); 876 break; 877 case SYS_LISTEN: 878 ret = __sys_listen(a0, a1); 879 break; 880 case SYS_ACCEPT: 881 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 882 break; 883 case SYS_GETSOCKNAME: 884 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 885 break; 886 case SYS_GETPEERNAME: 887 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 888 break; 889 case SYS_SOCKETPAIR: 890 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 891 break; 892 case SYS_SEND: 893 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); 894 break; 895 case SYS_SENDTO: 896 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], 897 compat_ptr(a[4]), a[5]); 898 break; 899 case SYS_RECV: 900 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 901 NULL, NULL); 902 break; 903 case SYS_RECVFROM: 904 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 905 compat_ptr(a[4]), 906 compat_ptr(a[5])); 907 break; 908 case SYS_SHUTDOWN: 909 ret = __sys_shutdown(a0, a1); 910 break; 911 case SYS_SETSOCKOPT: 912 ret = __compat_sys_setsockopt(a0, a1, a[2], 913 compat_ptr(a[3]), a[4]); 914 break; 915 case SYS_GETSOCKOPT: 916 ret = __compat_sys_getsockopt(a0, a1, a[2], 917 compat_ptr(a[3]), 918 compat_ptr(a[4])); 919 break; 920 case SYS_SENDMSG: 921 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 922 break; 923 case SYS_SENDMMSG: 924 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 925 break; 926 case SYS_RECVMSG: 927 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 928 break; 929 case SYS_RECVMMSG: 930 ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 931 compat_ptr(a[4])); 932 break; 933 case SYS_ACCEPT4: 934 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 935 break; 936 default: 937 ret = -EINVAL; 938 break; 939 } 940 return ret; 941 } 942