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/fs.h> 16 #include <linux/types.h> 17 #include <linux/file.h> 18 #include <linux/icmpv6.h> 19 #include <linux/socket.h> 20 #include <linux/syscalls.h> 21 #include <linux/filter.h> 22 #include <linux/compat.h> 23 #include <linux/security.h> 24 25 #include <net/scm.h> 26 #include <net/sock.h> 27 #include <net/ip.h> 28 #include <net/ipv6.h> 29 #include <asm/uaccess.h> 30 #include <net/compat.h> 31 32 static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 33 struct compat_iovec __user *uiov32, 34 int niov) 35 { 36 int tot_len = 0; 37 38 while (niov > 0) { 39 compat_uptr_t buf; 40 compat_size_t len; 41 42 if (get_user(len, &uiov32->iov_len) || 43 get_user(buf, &uiov32->iov_base)) { 44 tot_len = -EFAULT; 45 break; 46 } 47 tot_len += len; 48 kiov->iov_base = compat_ptr(buf); 49 kiov->iov_len = (__kernel_size_t) len; 50 uiov32++; 51 kiov++; 52 niov--; 53 } 54 return tot_len; 55 } 56 57 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 58 { 59 compat_uptr_t tmp1, tmp2, tmp3; 60 61 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 62 __get_user(tmp1, &umsg->msg_name) || 63 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 64 __get_user(tmp2, &umsg->msg_iov) || 65 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 66 __get_user(tmp3, &umsg->msg_control) || 67 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 68 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 69 return -EFAULT; 70 kmsg->msg_name = compat_ptr(tmp1); 71 kmsg->msg_iov = compat_ptr(tmp2); 72 kmsg->msg_control = compat_ptr(tmp3); 73 return 0; 74 } 75 76 /* I've named the args so it is easy to tell whose space the pointers are in. */ 77 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 78 char *kern_address, int mode) 79 { 80 int tot_len; 81 82 if (kern_msg->msg_namelen) { 83 if (mode==VERIFY_READ) { 84 int err = move_addr_to_kernel(kern_msg->msg_name, 85 kern_msg->msg_namelen, 86 kern_address); 87 if (err < 0) 88 return err; 89 } 90 kern_msg->msg_name = kern_address; 91 } else 92 kern_msg->msg_name = NULL; 93 94 tot_len = iov_from_user_compat_to_kern(kern_iov, 95 (struct compat_iovec __user *)kern_msg->msg_iov, 96 kern_msg->msg_iovlen); 97 if (tot_len >= 0) 98 kern_msg->msg_iov = kern_iov; 99 100 return tot_len; 101 } 102 103 /* Bleech... */ 104 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 105 106 #define CMSG_COMPAT_DATA(cmsg) \ 107 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 108 #define CMSG_COMPAT_SPACE(len) \ 109 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 110 #define CMSG_COMPAT_LEN(len) \ 111 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 112 113 #define CMSG_COMPAT_FIRSTHDR(msg) \ 114 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 115 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 116 (struct compat_cmsghdr __user *)NULL) 117 118 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 119 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 120 (ucmlen) <= (unsigned long) \ 121 ((mhdr)->msg_controllen - \ 122 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 123 124 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 125 struct compat_cmsghdr __user *cmsg, int cmsg_len) 126 { 127 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 128 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 129 msg->msg_controllen) 130 return NULL; 131 return (struct compat_cmsghdr __user *)ptr; 132 } 133 134 /* There is a lot of hair here because the alignment rules (and 135 * thus placement) of cmsg headers and length are different for 136 * 32-bit apps. -DaveM 137 */ 138 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 139 unsigned char *stackbuf, int stackbuf_size) 140 { 141 struct compat_cmsghdr __user *ucmsg; 142 struct cmsghdr *kcmsg, *kcmsg_base; 143 compat_size_t ucmlen; 144 __kernel_size_t kcmlen, tmp; 145 int err = -EFAULT; 146 147 kcmlen = 0; 148 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 149 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 150 while (ucmsg != NULL) { 151 if (get_user(ucmlen, &ucmsg->cmsg_len)) 152 return -EFAULT; 153 154 /* Catch bogons. */ 155 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 156 return -EINVAL; 157 158 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 159 CMSG_ALIGN(sizeof(struct cmsghdr))); 160 tmp = CMSG_ALIGN(tmp); 161 kcmlen += tmp; 162 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 163 } 164 if (kcmlen == 0) 165 return -EINVAL; 166 167 /* The kcmlen holds the 64-bit version of the control length. 168 * It may not be modified as we do not stick it into the kmsg 169 * until we have successfully copied over all of the data 170 * from the user. 171 */ 172 if (kcmlen > stackbuf_size) 173 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 174 if (kcmsg == NULL) 175 return -ENOBUFS; 176 177 /* Now copy them over neatly. */ 178 memset(kcmsg, 0, kcmlen); 179 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 180 while (ucmsg != NULL) { 181 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 182 goto Efault; 183 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 184 goto Einval; 185 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 186 CMSG_ALIGN(sizeof(struct cmsghdr))); 187 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 188 goto Einval; 189 kcmsg->cmsg_len = tmp; 190 tmp = CMSG_ALIGN(tmp); 191 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 192 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 193 copy_from_user(CMSG_DATA(kcmsg), 194 CMSG_COMPAT_DATA(ucmsg), 195 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 196 goto Efault; 197 198 /* Advance. */ 199 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 200 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 201 } 202 203 /* Ok, looks like we made it. Hook it up and return success. */ 204 kmsg->msg_control = kcmsg_base; 205 kmsg->msg_controllen = kcmlen; 206 return 0; 207 208 Einval: 209 err = -EINVAL; 210 Efault: 211 if (kcmsg_base != (struct cmsghdr *)stackbuf) 212 sock_kfree_s(sk, kcmsg_base, kcmlen); 213 return err; 214 } 215 216 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 217 { 218 struct compat_timeval ctv; 219 struct compat_timespec cts; 220 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 221 struct compat_cmsghdr cmhdr; 222 int cmlen; 223 224 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 225 kmsg->msg_flags |= MSG_CTRUNC; 226 return 0; /* XXX: return error? check spec. */ 227 } 228 229 if (level == SOL_SOCKET && type == SO_TIMESTAMP) { 230 struct timeval *tv = (struct timeval *)data; 231 ctv.tv_sec = tv->tv_sec; 232 ctv.tv_usec = tv->tv_usec; 233 data = &ctv; 234 len = sizeof(ctv); 235 } 236 if (level == SOL_SOCKET && type == SO_TIMESTAMPNS) { 237 struct timespec *ts = (struct timespec *)data; 238 cts.tv_sec = ts->tv_sec; 239 cts.tv_nsec = ts->tv_nsec; 240 data = &cts; 241 len = sizeof(cts); 242 } 243 244 cmlen = CMSG_COMPAT_LEN(len); 245 if (kmsg->msg_controllen < cmlen) { 246 kmsg->msg_flags |= MSG_CTRUNC; 247 cmlen = kmsg->msg_controllen; 248 } 249 cmhdr.cmsg_level = level; 250 cmhdr.cmsg_type = type; 251 cmhdr.cmsg_len = cmlen; 252 253 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 254 return -EFAULT; 255 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 256 return -EFAULT; 257 cmlen = CMSG_COMPAT_SPACE(len); 258 if (kmsg->msg_controllen < cmlen) 259 cmlen = kmsg->msg_controllen; 260 kmsg->msg_control += cmlen; 261 kmsg->msg_controllen -= cmlen; 262 return 0; 263 } 264 265 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 266 { 267 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 268 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 269 int fdnum = scm->fp->count; 270 struct file **fp = scm->fp->fp; 271 int __user *cmfptr; 272 int err = 0, i; 273 274 if (fdnum < fdmax) 275 fdmax = fdnum; 276 277 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 278 int new_fd; 279 err = security_file_receive(fp[i]); 280 if (err) 281 break; 282 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 283 ? O_CLOEXEC : 0); 284 if (err < 0) 285 break; 286 new_fd = err; 287 err = put_user(new_fd, cmfptr); 288 if (err) { 289 put_unused_fd(new_fd); 290 break; 291 } 292 /* Bump the usage count and install the file. */ 293 get_file(fp[i]); 294 fd_install(new_fd, fp[i]); 295 } 296 297 if (i > 0) { 298 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 299 err = put_user(SOL_SOCKET, &cm->cmsg_level); 300 if (!err) 301 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 302 if (!err) 303 err = put_user(cmlen, &cm->cmsg_len); 304 if (!err) { 305 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 306 kmsg->msg_control += cmlen; 307 kmsg->msg_controllen -= cmlen; 308 } 309 } 310 if (i < fdnum) 311 kmsg->msg_flags |= MSG_CTRUNC; 312 313 /* 314 * All of the files that fit in the message have had their 315 * usage counts incremented, so we just free the list. 316 */ 317 __scm_destroy(scm); 318 } 319 320 /* 321 * A struct sock_filter is architecture independent. 322 */ 323 struct compat_sock_fprog { 324 u16 len; 325 compat_uptr_t filter; /* struct sock_filter * */ 326 }; 327 328 static int do_set_attach_filter(struct socket *sock, int level, int optname, 329 char __user *optval, int optlen) 330 { 331 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 332 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 333 compat_uptr_t ptr; 334 u16 len; 335 336 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 337 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 338 __get_user(len, &fprog32->len) || 339 __get_user(ptr, &fprog32->filter) || 340 __put_user(len, &kfprog->len) || 341 __put_user(compat_ptr(ptr), &kfprog->filter)) 342 return -EFAULT; 343 344 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 345 sizeof(struct sock_fprog)); 346 } 347 348 static int do_set_sock_timeout(struct socket *sock, int level, 349 int optname, char __user *optval, int optlen) 350 { 351 struct compat_timeval __user *up = (struct compat_timeval __user *) optval; 352 struct timeval ktime; 353 mm_segment_t old_fs; 354 int err; 355 356 if (optlen < sizeof(*up)) 357 return -EINVAL; 358 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 359 __get_user(ktime.tv_sec, &up->tv_sec) || 360 __get_user(ktime.tv_usec, &up->tv_usec)) 361 return -EFAULT; 362 old_fs = get_fs(); 363 set_fs(KERNEL_DS); 364 err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime)); 365 set_fs(old_fs); 366 367 return err; 368 } 369 370 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 371 char __user *optval, int optlen) 372 { 373 if (optname == SO_ATTACH_FILTER) 374 return do_set_attach_filter(sock, level, optname, 375 optval, optlen); 376 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 377 return do_set_sock_timeout(sock, level, optname, optval, optlen); 378 379 return sock_setsockopt(sock, level, optname, optval, optlen); 380 } 381 382 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 383 char __user *optval, int optlen) 384 { 385 int err; 386 struct socket *sock; 387 388 if (optlen < 0) 389 return -EINVAL; 390 391 if ((sock = sockfd_lookup(fd, &err))!=NULL) 392 { 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 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 414 char __user *optval, int __user *optlen) 415 { 416 struct compat_timeval __user *up; 417 struct timeval ktime; 418 mm_segment_t old_fs; 419 int len, err; 420 421 up = (struct compat_timeval __user *) optval; 422 if (get_user(len, optlen)) 423 return -EFAULT; 424 if (len < sizeof(*up)) 425 return -EINVAL; 426 len = sizeof(ktime); 427 old_fs = get_fs(); 428 set_fs(KERNEL_DS); 429 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 430 set_fs(old_fs); 431 432 if (!err) { 433 if (put_user(sizeof(*up), optlen) || 434 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 435 __put_user(ktime.tv_sec, &up->tv_sec) || 436 __put_user(ktime.tv_usec, &up->tv_usec)) 437 err = -EFAULT; 438 } 439 return err; 440 } 441 442 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 443 char __user *optval, int __user *optlen) 444 { 445 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 446 return do_get_sock_timeout(sock, level, optname, optval, optlen); 447 return sock_getsockopt(sock, level, optname, optval, optlen); 448 } 449 450 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 451 { 452 struct compat_timeval __user *ctv = 453 (struct compat_timeval __user*) userstamp; 454 int err = -ENOENT; 455 struct timeval tv; 456 457 if (!sock_flag(sk, SOCK_TIMESTAMP)) 458 sock_enable_timestamp(sk); 459 tv = ktime_to_timeval(sk->sk_stamp); 460 if (tv.tv_sec == -1) 461 return err; 462 if (tv.tv_sec == 0) { 463 sk->sk_stamp = ktime_get_real(); 464 tv = ktime_to_timeval(sk->sk_stamp); 465 } 466 err = 0; 467 if (put_user(tv.tv_sec, &ctv->tv_sec) || 468 put_user(tv.tv_usec, &ctv->tv_usec)) 469 err = -EFAULT; 470 return err; 471 } 472 EXPORT_SYMBOL(compat_sock_get_timestamp); 473 474 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 475 { 476 struct compat_timespec __user *ctv = 477 (struct compat_timespec __user*) userstamp; 478 int err = -ENOENT; 479 struct timespec ts; 480 481 if (!sock_flag(sk, SOCK_TIMESTAMP)) 482 sock_enable_timestamp(sk); 483 ts = ktime_to_timespec(sk->sk_stamp); 484 if (ts.tv_sec == -1) 485 return err; 486 if (ts.tv_sec == 0) { 487 sk->sk_stamp = ktime_get_real(); 488 ts = ktime_to_timespec(sk->sk_stamp); 489 } 490 err = 0; 491 if (put_user(ts.tv_sec, &ctv->tv_sec) || 492 put_user(ts.tv_nsec, &ctv->tv_nsec)) 493 err = -EFAULT; 494 return err; 495 } 496 EXPORT_SYMBOL(compat_sock_get_timestampns); 497 498 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 499 char __user *optval, int __user *optlen) 500 { 501 int err; 502 struct socket *sock; 503 504 if ((sock = sockfd_lookup(fd, &err))!=NULL) 505 { 506 err = security_socket_getsockopt(sock, level, 507 optname); 508 if (err) { 509 sockfd_put(sock); 510 return err; 511 } 512 513 if (level == SOL_SOCKET) 514 err = compat_sock_getsockopt(sock, level, 515 optname, optval, optlen); 516 else if (sock->ops->compat_getsockopt) 517 err = sock->ops->compat_getsockopt(sock, level, 518 optname, optval, optlen); 519 else 520 err = sock->ops->getsockopt(sock, level, 521 optname, optval, optlen); 522 sockfd_put(sock); 523 } 524 return err; 525 } 526 527 struct compat_group_req { 528 __u32 gr_interface; 529 struct __kernel_sockaddr_storage gr_group 530 __attribute__ ((aligned(4))); 531 } __attribute__ ((packed)); 532 533 struct compat_group_source_req { 534 __u32 gsr_interface; 535 struct __kernel_sockaddr_storage gsr_group 536 __attribute__ ((aligned(4))); 537 struct __kernel_sockaddr_storage gsr_source 538 __attribute__ ((aligned(4))); 539 } __attribute__ ((packed)); 540 541 struct compat_group_filter { 542 __u32 gf_interface; 543 struct __kernel_sockaddr_storage gf_group 544 __attribute__ ((aligned(4))); 545 __u32 gf_fmode; 546 __u32 gf_numsrc; 547 struct __kernel_sockaddr_storage gf_slist[1] 548 __attribute__ ((aligned(4))); 549 } __attribute__ ((packed)); 550 551 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 552 sizeof(struct __kernel_sockaddr_storage)) 553 554 555 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 556 char __user *optval, int optlen, 557 int (*setsockopt)(struct sock *,int,int,char __user *,int)) 558 { 559 char __user *koptval = optval; 560 int koptlen = optlen; 561 562 switch (optname) { 563 case MCAST_JOIN_GROUP: 564 case MCAST_LEAVE_GROUP: 565 { 566 struct compat_group_req __user *gr32 = (void *)optval; 567 struct group_req __user *kgr = 568 compat_alloc_user_space(sizeof(struct group_req)); 569 u32 interface; 570 571 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 572 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 573 __get_user(interface, &gr32->gr_interface) || 574 __put_user(interface, &kgr->gr_interface) || 575 copy_in_user(&kgr->gr_group, &gr32->gr_group, 576 sizeof(kgr->gr_group))) 577 return -EFAULT; 578 koptval = (char __user *)kgr; 579 koptlen = sizeof(struct group_req); 580 break; 581 } 582 case MCAST_JOIN_SOURCE_GROUP: 583 case MCAST_LEAVE_SOURCE_GROUP: 584 case MCAST_BLOCK_SOURCE: 585 case MCAST_UNBLOCK_SOURCE: 586 { 587 struct compat_group_source_req __user *gsr32 = (void *)optval; 588 struct group_source_req __user *kgsr = compat_alloc_user_space( 589 sizeof(struct group_source_req)); 590 u32 interface; 591 592 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 593 !access_ok(VERIFY_WRITE, kgsr, 594 sizeof(struct group_source_req)) || 595 __get_user(interface, &gsr32->gsr_interface) || 596 __put_user(interface, &kgsr->gsr_interface) || 597 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 598 sizeof(kgsr->gsr_group)) || 599 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 600 sizeof(kgsr->gsr_source))) 601 return -EFAULT; 602 koptval = (char __user *)kgsr; 603 koptlen = sizeof(struct group_source_req); 604 break; 605 } 606 case MCAST_MSFILTER: 607 { 608 struct compat_group_filter __user *gf32 = (void *)optval; 609 struct group_filter __user *kgf; 610 u32 interface, fmode, numsrc; 611 612 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 613 __get_user(interface, &gf32->gf_interface) || 614 __get_user(fmode, &gf32->gf_fmode) || 615 __get_user(numsrc, &gf32->gf_numsrc)) 616 return -EFAULT; 617 koptlen = optlen + sizeof(struct group_filter) - 618 sizeof(struct compat_group_filter); 619 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 620 return -EINVAL; 621 kgf = compat_alloc_user_space(koptlen); 622 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 623 __put_user(interface, &kgf->gf_interface) || 624 __put_user(fmode, &kgf->gf_fmode) || 625 __put_user(numsrc, &kgf->gf_numsrc) || 626 copy_in_user(&kgf->gf_group, &gf32->gf_group, 627 sizeof(kgf->gf_group)) || 628 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 629 numsrc * sizeof(kgf->gf_slist[0])))) 630 return -EFAULT; 631 koptval = (char __user *)kgf; 632 break; 633 } 634 635 default: 636 break; 637 } 638 return setsockopt(sock, level, optname, koptval, koptlen); 639 } 640 641 EXPORT_SYMBOL(compat_mc_setsockopt); 642 643 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 644 char __user *optval, int __user *optlen, 645 int (*getsockopt)(struct sock *,int,int,char __user *,int __user *)) 646 { 647 struct compat_group_filter __user *gf32 = (void *)optval; 648 struct group_filter __user *kgf; 649 int __user *koptlen; 650 u32 interface, fmode, numsrc; 651 int klen, ulen, err; 652 653 if (optname != MCAST_MSFILTER) 654 return getsockopt(sock, level, optname, optval, optlen); 655 656 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 657 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 658 __get_user(ulen, optlen)) 659 return -EFAULT; 660 661 /* adjust len for pad */ 662 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 663 664 if (klen < GROUP_FILTER_SIZE(0)) 665 return -EINVAL; 666 667 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 668 __put_user(klen, koptlen)) 669 return -EFAULT; 670 671 /* have to allow space for previous compat_alloc_user_space, too */ 672 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 673 674 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 675 __get_user(interface, &gf32->gf_interface) || 676 __get_user(fmode, &gf32->gf_fmode) || 677 __get_user(numsrc, &gf32->gf_numsrc) || 678 __put_user(interface, &kgf->gf_interface) || 679 __put_user(fmode, &kgf->gf_fmode) || 680 __put_user(numsrc, &kgf->gf_numsrc) || 681 copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group))) 682 return -EFAULT; 683 684 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 685 if (err) 686 return err; 687 688 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 689 __get_user(klen, koptlen)) 690 return -EFAULT; 691 692 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 693 694 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 695 __put_user(ulen, optlen)) 696 return -EFAULT; 697 698 if (!access_ok(VERIFY_READ, kgf, klen) || 699 !access_ok(VERIFY_WRITE, gf32, ulen) || 700 __get_user(interface, &kgf->gf_interface) || 701 __get_user(fmode, &kgf->gf_fmode) || 702 __get_user(numsrc, &kgf->gf_numsrc) || 703 __put_user(interface, &gf32->gf_interface) || 704 __put_user(fmode, &gf32->gf_fmode) || 705 __put_user(numsrc, &gf32->gf_numsrc)) 706 return -EFAULT; 707 if (numsrc) { 708 int copylen; 709 710 klen -= GROUP_FILTER_SIZE(0); 711 copylen = numsrc * sizeof(gf32->gf_slist[0]); 712 if (copylen > klen) 713 copylen = klen; 714 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 715 return -EFAULT; 716 } 717 return err; 718 } 719 720 EXPORT_SYMBOL(compat_mc_getsockopt); 721 722 723 /* Argument list sizes for compat_sys_socketcall */ 724 #define AL(x) ((x) * sizeof(u32)) 725 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 726 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 727 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 728 #undef AL 729 730 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 731 { 732 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 733 } 734 735 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 736 { 737 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 738 } 739 740 asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 741 { 742 int ret; 743 u32 a[6]; 744 u32 a0, a1; 745 746 if (call < SYS_SOCKET || call > SYS_RECVMSG) 747 return -EINVAL; 748 if (copy_from_user(a, args, nas[call])) 749 return -EFAULT; 750 a0 = a[0]; 751 a1 = a[1]; 752 753 switch (call) { 754 case SYS_SOCKET: 755 ret = sys_socket(a0, a1, a[2]); 756 break; 757 case SYS_BIND: 758 ret = sys_bind(a0, compat_ptr(a1), a[2]); 759 break; 760 case SYS_CONNECT: 761 ret = sys_connect(a0, compat_ptr(a1), a[2]); 762 break; 763 case SYS_LISTEN: 764 ret = sys_listen(a0, a1); 765 break; 766 case SYS_ACCEPT: 767 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2])); 768 break; 769 case SYS_GETSOCKNAME: 770 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 771 break; 772 case SYS_GETPEERNAME: 773 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 774 break; 775 case SYS_SOCKETPAIR: 776 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 777 break; 778 case SYS_SEND: 779 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 780 break; 781 case SYS_SENDTO: 782 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 783 break; 784 case SYS_RECV: 785 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]); 786 break; 787 case SYS_RECVFROM: 788 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5])); 789 break; 790 case SYS_SHUTDOWN: 791 ret = sys_shutdown(a0,a1); 792 break; 793 case SYS_SETSOCKOPT: 794 ret = compat_sys_setsockopt(a0, a1, a[2], 795 compat_ptr(a[3]), a[4]); 796 break; 797 case SYS_GETSOCKOPT: 798 ret = compat_sys_getsockopt(a0, a1, a[2], 799 compat_ptr(a[3]), compat_ptr(a[4])); 800 break; 801 case SYS_SENDMSG: 802 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 803 break; 804 case SYS_RECVMSG: 805 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 806 break; 807 default: 808 ret = -EINVAL; 809 break; 810 } 811 return ret; 812 } 813