1 /* 2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c. 3 * 4 * Copyright (C) 2000 VA Linux Co 5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> 6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> 7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) 9 * Copyright (C) 2000 Hewlett-Packard Co. 10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> 11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/gfp.h> 16 #include <linux/fs.h> 17 #include <linux/types.h> 18 #include <linux/file.h> 19 #include <linux/icmpv6.h> 20 #include <linux/socket.h> 21 #include <linux/syscalls.h> 22 #include <linux/filter.h> 23 #include <linux/compat.h> 24 #include <linux/security.h> 25 #include <linux/export.h> 26 27 #include <net/scm.h> 28 #include <net/sock.h> 29 #include <net/ip.h> 30 #include <net/ipv6.h> 31 #include <asm/uaccess.h> 32 #include <net/compat.h> 33 34 static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 35 struct compat_iovec __user *uiov32, 36 int niov) 37 { 38 int tot_len = 0; 39 40 while (niov > 0) { 41 compat_uptr_t buf; 42 compat_size_t len; 43 44 if (get_user(len, &uiov32->iov_len) || 45 get_user(buf, &uiov32->iov_base)) 46 return -EFAULT; 47 48 if (len > INT_MAX - tot_len) 49 len = INT_MAX - tot_len; 50 51 tot_len += len; 52 kiov->iov_base = compat_ptr(buf); 53 kiov->iov_len = (__kernel_size_t) len; 54 uiov32++; 55 kiov++; 56 niov--; 57 } 58 return tot_len; 59 } 60 61 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 62 { 63 compat_uptr_t tmp1, tmp2, tmp3; 64 65 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 66 __get_user(tmp1, &umsg->msg_name) || 67 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 68 __get_user(tmp2, &umsg->msg_iov) || 69 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 70 __get_user(tmp3, &umsg->msg_control) || 71 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 72 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 73 return -EFAULT; 74 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 75 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 76 kmsg->msg_name = compat_ptr(tmp1); 77 kmsg->msg_iov = compat_ptr(tmp2); 78 kmsg->msg_control = compat_ptr(tmp3); 79 return 0; 80 } 81 82 /* I've named the args so it is easy to tell whose space the pointers are in. */ 83 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 84 struct sockaddr_storage *kern_address, int mode) 85 { 86 int tot_len; 87 88 if (kern_msg->msg_name && kern_msg->msg_namelen) { 89 if (mode == VERIFY_READ) { 90 int err = move_addr_to_kernel(kern_msg->msg_name, 91 kern_msg->msg_namelen, 92 kern_address); 93 if (err < 0) 94 return err; 95 } 96 kern_msg->msg_name = kern_address; 97 } else { 98 kern_msg->msg_name = NULL; 99 kern_msg->msg_namelen = 0; 100 } 101 102 tot_len = iov_from_user_compat_to_kern(kern_iov, 103 (struct compat_iovec __user *)kern_msg->msg_iov, 104 kern_msg->msg_iovlen); 105 if (tot_len >= 0) 106 kern_msg->msg_iov = kern_iov; 107 108 return tot_len; 109 } 110 111 /* Bleech... */ 112 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 113 114 #define CMSG_COMPAT_DATA(cmsg) \ 115 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 116 #define CMSG_COMPAT_SPACE(len) \ 117 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 118 #define CMSG_COMPAT_LEN(len) \ 119 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 120 121 #define CMSG_COMPAT_FIRSTHDR(msg) \ 122 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 123 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 124 (struct compat_cmsghdr __user *)NULL) 125 126 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 127 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 128 (ucmlen) <= (unsigned long) \ 129 ((mhdr)->msg_controllen - \ 130 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 131 132 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 133 struct compat_cmsghdr __user *cmsg, int cmsg_len) 134 { 135 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 136 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 137 msg->msg_controllen) 138 return NULL; 139 return (struct compat_cmsghdr __user *)ptr; 140 } 141 142 /* There is a lot of hair here because the alignment rules (and 143 * thus placement) of cmsg headers and length are different for 144 * 32-bit apps. -DaveM 145 */ 146 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 147 unsigned char *stackbuf, int stackbuf_size) 148 { 149 struct compat_cmsghdr __user *ucmsg; 150 struct cmsghdr *kcmsg, *kcmsg_base; 151 compat_size_t ucmlen; 152 __kernel_size_t kcmlen, tmp; 153 int err = -EFAULT; 154 155 kcmlen = 0; 156 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 157 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 158 while (ucmsg != NULL) { 159 if (get_user(ucmlen, &ucmsg->cmsg_len)) 160 return -EFAULT; 161 162 /* Catch bogons. */ 163 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 164 return -EINVAL; 165 166 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 167 CMSG_ALIGN(sizeof(struct cmsghdr))); 168 tmp = CMSG_ALIGN(tmp); 169 kcmlen += tmp; 170 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 171 } 172 if (kcmlen == 0) 173 return -EINVAL; 174 175 /* The kcmlen holds the 64-bit version of the control length. 176 * It may not be modified as we do not stick it into the kmsg 177 * until we have successfully copied over all of the data 178 * from the user. 179 */ 180 if (kcmlen > stackbuf_size) 181 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 182 if (kcmsg == NULL) 183 return -ENOBUFS; 184 185 /* Now copy them over neatly. */ 186 memset(kcmsg, 0, kcmlen); 187 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 188 while (ucmsg != NULL) { 189 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 190 goto Efault; 191 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 192 goto Einval; 193 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 194 CMSG_ALIGN(sizeof(struct cmsghdr))); 195 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 196 goto Einval; 197 kcmsg->cmsg_len = tmp; 198 tmp = CMSG_ALIGN(tmp); 199 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 200 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 201 copy_from_user(CMSG_DATA(kcmsg), 202 CMSG_COMPAT_DATA(ucmsg), 203 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 204 goto Efault; 205 206 /* Advance. */ 207 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 208 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 209 } 210 211 /* Ok, looks like we made it. Hook it up and return success. */ 212 kmsg->msg_control = kcmsg_base; 213 kmsg->msg_controllen = kcmlen; 214 return 0; 215 216 Einval: 217 err = -EINVAL; 218 Efault: 219 if (kcmsg_base != (struct cmsghdr *)stackbuf) 220 sock_kfree_s(sk, kcmsg_base, kcmlen); 221 return err; 222 } 223 224 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 225 { 226 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 227 struct compat_cmsghdr cmhdr; 228 struct compat_timeval ctv; 229 struct compat_timespec cts[3]; 230 int cmlen; 231 232 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 233 kmsg->msg_flags |= MSG_CTRUNC; 234 return 0; /* XXX: return error? check spec. */ 235 } 236 237 if (!COMPAT_USE_64BIT_TIME) { 238 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 239 struct timeval *tv = (struct timeval *)data; 240 ctv.tv_sec = tv->tv_sec; 241 ctv.tv_usec = tv->tv_usec; 242 data = &ctv; 243 len = sizeof(ctv); 244 } 245 if (level == SOL_SOCKET && 246 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 247 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 248 int i; 249 struct timespec *ts = (struct timespec *)data; 250 for (i = 0; i < count; i++) { 251 cts[i].tv_sec = ts[i].tv_sec; 252 cts[i].tv_nsec = ts[i].tv_nsec; 253 } 254 data = &cts; 255 len = sizeof(cts[0]) * count; 256 } 257 } 258 259 cmlen = CMSG_COMPAT_LEN(len); 260 if (kmsg->msg_controllen < cmlen) { 261 kmsg->msg_flags |= MSG_CTRUNC; 262 cmlen = kmsg->msg_controllen; 263 } 264 cmhdr.cmsg_level = level; 265 cmhdr.cmsg_type = type; 266 cmhdr.cmsg_len = cmlen; 267 268 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 269 return -EFAULT; 270 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 271 return -EFAULT; 272 cmlen = CMSG_COMPAT_SPACE(len); 273 if (kmsg->msg_controllen < cmlen) 274 cmlen = kmsg->msg_controllen; 275 kmsg->msg_control += cmlen; 276 kmsg->msg_controllen -= cmlen; 277 return 0; 278 } 279 280 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 281 { 282 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 283 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 284 int fdnum = scm->fp->count; 285 struct file **fp = scm->fp->fp; 286 int __user *cmfptr; 287 int err = 0, i; 288 289 if (fdnum < fdmax) 290 fdmax = fdnum; 291 292 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 293 int new_fd; 294 err = security_file_receive(fp[i]); 295 if (err) 296 break; 297 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 298 ? O_CLOEXEC : 0); 299 if (err < 0) 300 break; 301 new_fd = err; 302 err = put_user(new_fd, cmfptr); 303 if (err) { 304 put_unused_fd(new_fd); 305 break; 306 } 307 /* Bump the usage count and install the file. */ 308 fd_install(new_fd, get_file(fp[i])); 309 } 310 311 if (i > 0) { 312 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 313 err = put_user(SOL_SOCKET, &cm->cmsg_level); 314 if (!err) 315 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 316 if (!err) 317 err = put_user(cmlen, &cm->cmsg_len); 318 if (!err) { 319 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 320 kmsg->msg_control += cmlen; 321 kmsg->msg_controllen -= cmlen; 322 } 323 } 324 if (i < fdnum) 325 kmsg->msg_flags |= MSG_CTRUNC; 326 327 /* 328 * All of the files that fit in the message have had their 329 * usage counts incremented, so we just free the list. 330 */ 331 __scm_destroy(scm); 332 } 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 compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 338 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 339 compat_uptr_t ptr; 340 u16 len; 341 342 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 343 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 344 __get_user(len, &fprog32->len) || 345 __get_user(ptr, &fprog32->filter) || 346 __put_user(len, &kfprog->len) || 347 __put_user(compat_ptr(ptr), &kfprog->filter)) 348 return -EFAULT; 349 350 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 351 sizeof(struct sock_fprog)); 352 } 353 354 static int do_set_sock_timeout(struct socket *sock, int level, 355 int optname, char __user *optval, unsigned int optlen) 356 { 357 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 358 struct timeval ktime; 359 mm_segment_t old_fs; 360 int err; 361 362 if (optlen < sizeof(*up)) 363 return -EINVAL; 364 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 365 __get_user(ktime.tv_sec, &up->tv_sec) || 366 __get_user(ktime.tv_usec, &up->tv_usec)) 367 return -EFAULT; 368 old_fs = get_fs(); 369 set_fs(KERNEL_DS); 370 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 371 set_fs(old_fs); 372 373 return err; 374 } 375 376 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 377 char __user *optval, unsigned int optlen) 378 { 379 if (optname == SO_ATTACH_FILTER) 380 return do_set_attach_filter(sock, level, optname, 381 optval, optlen); 382 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 383 return do_set_sock_timeout(sock, level, optname, optval, optlen); 384 385 return sock_setsockopt(sock, level, optname, optval, optlen); 386 } 387 388 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 389 char __user *, optval, unsigned int, optlen) 390 { 391 int err; 392 struct socket *sock = sockfd_lookup(fd, &err); 393 394 if (sock) { 395 err = security_socket_setsockopt(sock, level, optname); 396 if (err) { 397 sockfd_put(sock); 398 return err; 399 } 400 401 if (level == SOL_SOCKET) 402 err = compat_sock_setsockopt(sock, level, 403 optname, optval, optlen); 404 else if (sock->ops->compat_setsockopt) 405 err = sock->ops->compat_setsockopt(sock, level, 406 optname, optval, optlen); 407 else 408 err = sock->ops->setsockopt(sock, level, 409 optname, optval, optlen); 410 sockfd_put(sock); 411 } 412 return err; 413 } 414 415 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 416 char __user *optval, int __user *optlen) 417 { 418 struct compat_timeval __user *up; 419 struct timeval ktime; 420 mm_segment_t old_fs; 421 int len, err; 422 423 up = (struct compat_timeval __user *) optval; 424 if (get_user(len, optlen)) 425 return -EFAULT; 426 if (len < sizeof(*up)) 427 return -EINVAL; 428 len = sizeof(ktime); 429 old_fs = get_fs(); 430 set_fs(KERNEL_DS); 431 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 432 set_fs(old_fs); 433 434 if (!err) { 435 if (put_user(sizeof(*up), optlen) || 436 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 437 __put_user(ktime.tv_sec, &up->tv_sec) || 438 __put_user(ktime.tv_usec, &up->tv_usec)) 439 err = -EFAULT; 440 } 441 return err; 442 } 443 444 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 445 char __user *optval, int __user *optlen) 446 { 447 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 448 return do_get_sock_timeout(sock, level, optname, optval, optlen); 449 return sock_getsockopt(sock, level, optname, optval, optlen); 450 } 451 452 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 453 { 454 struct compat_timeval __user *ctv; 455 int err; 456 struct timeval tv; 457 458 if (COMPAT_USE_64BIT_TIME) 459 return sock_get_timestamp(sk, userstamp); 460 461 ctv = (struct compat_timeval __user *) userstamp; 462 err = -ENOENT; 463 if (!sock_flag(sk, SOCK_TIMESTAMP)) 464 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 465 tv = ktime_to_timeval(sk->sk_stamp); 466 if (tv.tv_sec == -1) 467 return err; 468 if (tv.tv_sec == 0) { 469 sk->sk_stamp = ktime_get_real(); 470 tv = ktime_to_timeval(sk->sk_stamp); 471 } 472 err = 0; 473 if (put_user(tv.tv_sec, &ctv->tv_sec) || 474 put_user(tv.tv_usec, &ctv->tv_usec)) 475 err = -EFAULT; 476 return err; 477 } 478 EXPORT_SYMBOL(compat_sock_get_timestamp); 479 480 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 481 { 482 struct compat_timespec __user *ctv; 483 int err; 484 struct timespec ts; 485 486 if (COMPAT_USE_64BIT_TIME) 487 return sock_get_timestampns (sk, userstamp); 488 489 ctv = (struct compat_timespec __user *) userstamp; 490 err = -ENOENT; 491 if (!sock_flag(sk, SOCK_TIMESTAMP)) 492 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 493 ts = ktime_to_timespec(sk->sk_stamp); 494 if (ts.tv_sec == -1) 495 return err; 496 if (ts.tv_sec == 0) { 497 sk->sk_stamp = ktime_get_real(); 498 ts = ktime_to_timespec(sk->sk_stamp); 499 } 500 err = 0; 501 if (put_user(ts.tv_sec, &ctv->tv_sec) || 502 put_user(ts.tv_nsec, &ctv->tv_nsec)) 503 err = -EFAULT; 504 return err; 505 } 506 EXPORT_SYMBOL(compat_sock_get_timestampns); 507 508 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 509 char __user *, optval, int __user *, optlen) 510 { 511 int err; 512 struct socket *sock = sockfd_lookup(fd, &err); 513 514 if (sock) { 515 err = security_socket_getsockopt(sock, level, optname); 516 if (err) { 517 sockfd_put(sock); 518 return err; 519 } 520 521 if (level == SOL_SOCKET) 522 err = compat_sock_getsockopt(sock, level, 523 optname, optval, optlen); 524 else if (sock->ops->compat_getsockopt) 525 err = sock->ops->compat_getsockopt(sock, level, 526 optname, optval, optlen); 527 else 528 err = sock->ops->getsockopt(sock, level, 529 optname, optval, optlen); 530 sockfd_put(sock); 531 } 532 return err; 533 } 534 535 struct compat_group_req { 536 __u32 gr_interface; 537 struct __kernel_sockaddr_storage gr_group 538 __attribute__ ((aligned(4))); 539 } __packed; 540 541 struct compat_group_source_req { 542 __u32 gsr_interface; 543 struct __kernel_sockaddr_storage gsr_group 544 __attribute__ ((aligned(4))); 545 struct __kernel_sockaddr_storage gsr_source 546 __attribute__ ((aligned(4))); 547 } __packed; 548 549 struct compat_group_filter { 550 __u32 gf_interface; 551 struct __kernel_sockaddr_storage gf_group 552 __attribute__ ((aligned(4))); 553 __u32 gf_fmode; 554 __u32 gf_numsrc; 555 struct __kernel_sockaddr_storage gf_slist[1] 556 __attribute__ ((aligned(4))); 557 } __packed; 558 559 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 560 sizeof(struct __kernel_sockaddr_storage)) 561 562 563 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 564 char __user *optval, unsigned int optlen, 565 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 566 { 567 char __user *koptval = optval; 568 int koptlen = optlen; 569 570 switch (optname) { 571 case MCAST_JOIN_GROUP: 572 case MCAST_LEAVE_GROUP: 573 { 574 struct compat_group_req __user *gr32 = (void *)optval; 575 struct group_req __user *kgr = 576 compat_alloc_user_space(sizeof(struct group_req)); 577 u32 interface; 578 579 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 580 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 581 __get_user(interface, &gr32->gr_interface) || 582 __put_user(interface, &kgr->gr_interface) || 583 copy_in_user(&kgr->gr_group, &gr32->gr_group, 584 sizeof(kgr->gr_group))) 585 return -EFAULT; 586 koptval = (char __user *)kgr; 587 koptlen = sizeof(struct group_req); 588 break; 589 } 590 case MCAST_JOIN_SOURCE_GROUP: 591 case MCAST_LEAVE_SOURCE_GROUP: 592 case MCAST_BLOCK_SOURCE: 593 case MCAST_UNBLOCK_SOURCE: 594 { 595 struct compat_group_source_req __user *gsr32 = (void *)optval; 596 struct group_source_req __user *kgsr = compat_alloc_user_space( 597 sizeof(struct group_source_req)); 598 u32 interface; 599 600 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 601 !access_ok(VERIFY_WRITE, kgsr, 602 sizeof(struct group_source_req)) || 603 __get_user(interface, &gsr32->gsr_interface) || 604 __put_user(interface, &kgsr->gsr_interface) || 605 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 606 sizeof(kgsr->gsr_group)) || 607 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 608 sizeof(kgsr->gsr_source))) 609 return -EFAULT; 610 koptval = (char __user *)kgsr; 611 koptlen = sizeof(struct group_source_req); 612 break; 613 } 614 case MCAST_MSFILTER: 615 { 616 struct compat_group_filter __user *gf32 = (void *)optval; 617 struct group_filter __user *kgf; 618 u32 interface, fmode, numsrc; 619 620 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 621 __get_user(interface, &gf32->gf_interface) || 622 __get_user(fmode, &gf32->gf_fmode) || 623 __get_user(numsrc, &gf32->gf_numsrc)) 624 return -EFAULT; 625 koptlen = optlen + sizeof(struct group_filter) - 626 sizeof(struct compat_group_filter); 627 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 628 return -EINVAL; 629 kgf = compat_alloc_user_space(koptlen); 630 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 631 __put_user(interface, &kgf->gf_interface) || 632 __put_user(fmode, &kgf->gf_fmode) || 633 __put_user(numsrc, &kgf->gf_numsrc) || 634 copy_in_user(&kgf->gf_group, &gf32->gf_group, 635 sizeof(kgf->gf_group)) || 636 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 637 numsrc * sizeof(kgf->gf_slist[0])))) 638 return -EFAULT; 639 koptval = (char __user *)kgf; 640 break; 641 } 642 643 default: 644 break; 645 } 646 return setsockopt(sock, level, optname, koptval, koptlen); 647 } 648 EXPORT_SYMBOL(compat_mc_setsockopt); 649 650 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 651 char __user *optval, int __user *optlen, 652 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 653 { 654 struct compat_group_filter __user *gf32 = (void *)optval; 655 struct group_filter __user *kgf; 656 int __user *koptlen; 657 u32 interface, fmode, numsrc; 658 int klen, ulen, err; 659 660 if (optname != MCAST_MSFILTER) 661 return getsockopt(sock, level, optname, optval, optlen); 662 663 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 664 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 665 __get_user(ulen, optlen)) 666 return -EFAULT; 667 668 /* adjust len for pad */ 669 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 670 671 if (klen < GROUP_FILTER_SIZE(0)) 672 return -EINVAL; 673 674 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 675 __put_user(klen, koptlen)) 676 return -EFAULT; 677 678 /* have to allow space for previous compat_alloc_user_space, too */ 679 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 680 681 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 682 __get_user(interface, &gf32->gf_interface) || 683 __get_user(fmode, &gf32->gf_fmode) || 684 __get_user(numsrc, &gf32->gf_numsrc) || 685 __put_user(interface, &kgf->gf_interface) || 686 __put_user(fmode, &kgf->gf_fmode) || 687 __put_user(numsrc, &kgf->gf_numsrc) || 688 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 689 return -EFAULT; 690 691 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 692 if (err) 693 return err; 694 695 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 696 __get_user(klen, koptlen)) 697 return -EFAULT; 698 699 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 700 701 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 702 __put_user(ulen, optlen)) 703 return -EFAULT; 704 705 if (!access_ok(VERIFY_READ, kgf, klen) || 706 !access_ok(VERIFY_WRITE, gf32, ulen) || 707 __get_user(interface, &kgf->gf_interface) || 708 __get_user(fmode, &kgf->gf_fmode) || 709 __get_user(numsrc, &kgf->gf_numsrc) || 710 __put_user(interface, &gf32->gf_interface) || 711 __put_user(fmode, &gf32->gf_fmode) || 712 __put_user(numsrc, &gf32->gf_numsrc)) 713 return -EFAULT; 714 if (numsrc) { 715 int copylen; 716 717 klen -= GROUP_FILTER_SIZE(0); 718 copylen = numsrc * sizeof(gf32->gf_slist[0]); 719 if (copylen > klen) 720 copylen = klen; 721 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 722 return -EFAULT; 723 } 724 return err; 725 } 726 EXPORT_SYMBOL(compat_mc_getsockopt); 727 728 729 /* Argument list sizes for compat_sys_socketcall */ 730 #define AL(x) ((x) * sizeof(u32)) 731 static unsigned char nas[21] = { 732 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 733 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 734 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 735 AL(4), AL(5), AL(4) 736 }; 737 #undef AL 738 739 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 740 { 741 if (flags & MSG_CMSG_COMPAT) 742 return -EINVAL; 743 return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 744 } 745 746 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 747 unsigned int, vlen, unsigned int, flags) 748 { 749 if (flags & MSG_CMSG_COMPAT) 750 return -EINVAL; 751 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 752 flags | MSG_CMSG_COMPAT); 753 } 754 755 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) 756 { 757 if (flags & MSG_CMSG_COMPAT) 758 return -EINVAL; 759 return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 760 } 761 762 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 763 { 764 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 765 } 766 767 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 768 unsigned int, flags, struct sockaddr __user *, addr, 769 int __user *, addrlen) 770 { 771 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 772 } 773 774 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 775 unsigned int, vlen, unsigned int, flags, 776 struct compat_timespec __user *, timeout) 777 { 778 int datagrams; 779 struct timespec ktspec; 780 781 if (flags & MSG_CMSG_COMPAT) 782 return -EINVAL; 783 784 if (timeout == NULL) 785 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 786 flags | MSG_CMSG_COMPAT, NULL); 787 788 if (compat_get_timespec(&ktspec, timeout)) 789 return -EFAULT; 790 791 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 792 flags | MSG_CMSG_COMPAT, &ktspec); 793 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 794 datagrams = -EFAULT; 795 796 return datagrams; 797 } 798 799 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 800 { 801 int ret; 802 u32 a[6]; 803 u32 a0, a1; 804 805 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 806 return -EINVAL; 807 if (copy_from_user(a, args, nas[call])) 808 return -EFAULT; 809 a0 = a[0]; 810 a1 = a[1]; 811 812 switch (call) { 813 case SYS_SOCKET: 814 ret = sys_socket(a0, a1, a[2]); 815 break; 816 case SYS_BIND: 817 ret = sys_bind(a0, compat_ptr(a1), a[2]); 818 break; 819 case SYS_CONNECT: 820 ret = sys_connect(a0, compat_ptr(a1), a[2]); 821 break; 822 case SYS_LISTEN: 823 ret = sys_listen(a0, a1); 824 break; 825 case SYS_ACCEPT: 826 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 827 break; 828 case SYS_GETSOCKNAME: 829 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 830 break; 831 case SYS_GETPEERNAME: 832 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 833 break; 834 case SYS_SOCKETPAIR: 835 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 836 break; 837 case SYS_SEND: 838 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 839 break; 840 case SYS_SENDTO: 841 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 842 break; 843 case SYS_RECV: 844 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 845 break; 846 case SYS_RECVFROM: 847 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 848 compat_ptr(a[4]), compat_ptr(a[5])); 849 break; 850 case SYS_SHUTDOWN: 851 ret = sys_shutdown(a0, a1); 852 break; 853 case SYS_SETSOCKOPT: 854 ret = compat_sys_setsockopt(a0, a1, a[2], 855 compat_ptr(a[3]), a[4]); 856 break; 857 case SYS_GETSOCKOPT: 858 ret = compat_sys_getsockopt(a0, a1, a[2], 859 compat_ptr(a[3]), compat_ptr(a[4])); 860 break; 861 case SYS_SENDMSG: 862 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 863 break; 864 case SYS_SENDMMSG: 865 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 866 break; 867 case SYS_RECVMSG: 868 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 869 break; 870 case SYS_RECVMMSG: 871 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 872 compat_ptr(a[4])); 873 break; 874 case SYS_ACCEPT4: 875 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 876 break; 877 default: 878 ret = -EINVAL; 879 break; 880 } 881 return ret; 882 } 883