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 26 #include <net/scm.h> 27 #include <net/sock.h> 28 #include <net/ip.h> 29 #include <net/ipv6.h> 30 #include <asm/uaccess.h> 31 #include <net/compat.h> 32 33 static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 34 struct compat_iovec __user *uiov32, 35 int niov) 36 { 37 int tot_len = 0; 38 39 while (niov > 0) { 40 compat_uptr_t buf; 41 compat_size_t len; 42 43 if (get_user(len, &uiov32->iov_len) || 44 get_user(buf, &uiov32->iov_base)) 45 return -EFAULT; 46 47 if (len > INT_MAX - tot_len) 48 len = INT_MAX - tot_len; 49 50 tot_len += len; 51 kiov->iov_base = compat_ptr(buf); 52 kiov->iov_len = (__kernel_size_t) len; 53 uiov32++; 54 kiov++; 55 niov--; 56 } 57 return tot_len; 58 } 59 60 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 61 { 62 compat_uptr_t tmp1, tmp2, tmp3; 63 64 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 65 __get_user(tmp1, &umsg->msg_name) || 66 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 67 __get_user(tmp2, &umsg->msg_iov) || 68 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 69 __get_user(tmp3, &umsg->msg_control) || 70 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 71 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 72 return -EFAULT; 73 kmsg->msg_name = compat_ptr(tmp1); 74 kmsg->msg_iov = compat_ptr(tmp2); 75 kmsg->msg_control = compat_ptr(tmp3); 76 return 0; 77 } 78 79 /* I've named the args so it is easy to tell whose space the pointers are in. */ 80 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 81 struct sockaddr *kern_address, int mode) 82 { 83 int tot_len; 84 85 if (kern_msg->msg_namelen) { 86 if (mode == VERIFY_READ) { 87 int err = move_addr_to_kernel(kern_msg->msg_name, 88 kern_msg->msg_namelen, 89 kern_address); 90 if (err < 0) 91 return err; 92 } 93 kern_msg->msg_name = kern_address; 94 } else 95 kern_msg->msg_name = NULL; 96 97 tot_len = iov_from_user_compat_to_kern(kern_iov, 98 (struct compat_iovec __user *)kern_msg->msg_iov, 99 kern_msg->msg_iovlen); 100 if (tot_len >= 0) 101 kern_msg->msg_iov = kern_iov; 102 103 return tot_len; 104 } 105 106 /* Bleech... */ 107 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 108 109 #define CMSG_COMPAT_DATA(cmsg) \ 110 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 111 #define CMSG_COMPAT_SPACE(len) \ 112 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 113 #define CMSG_COMPAT_LEN(len) \ 114 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 115 116 #define CMSG_COMPAT_FIRSTHDR(msg) \ 117 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 118 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 119 (struct compat_cmsghdr __user *)NULL) 120 121 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 122 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 123 (ucmlen) <= (unsigned long) \ 124 ((mhdr)->msg_controllen - \ 125 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 126 127 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 128 struct compat_cmsghdr __user *cmsg, int cmsg_len) 129 { 130 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 131 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 132 msg->msg_controllen) 133 return NULL; 134 return (struct compat_cmsghdr __user *)ptr; 135 } 136 137 /* There is a lot of hair here because the alignment rules (and 138 * thus placement) of cmsg headers and length are different for 139 * 32-bit apps. -DaveM 140 */ 141 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 142 unsigned char *stackbuf, int stackbuf_size) 143 { 144 struct compat_cmsghdr __user *ucmsg; 145 struct cmsghdr *kcmsg, *kcmsg_base; 146 compat_size_t ucmlen; 147 __kernel_size_t kcmlen, tmp; 148 int err = -EFAULT; 149 150 kcmlen = 0; 151 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 152 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 153 while (ucmsg != NULL) { 154 if (get_user(ucmlen, &ucmsg->cmsg_len)) 155 return -EFAULT; 156 157 /* Catch bogons. */ 158 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 159 return -EINVAL; 160 161 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 162 CMSG_ALIGN(sizeof(struct cmsghdr))); 163 tmp = CMSG_ALIGN(tmp); 164 kcmlen += tmp; 165 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 166 } 167 if (kcmlen == 0) 168 return -EINVAL; 169 170 /* The kcmlen holds the 64-bit version of the control length. 171 * It may not be modified as we do not stick it into the kmsg 172 * until we have successfully copied over all of the data 173 * from the user. 174 */ 175 if (kcmlen > stackbuf_size) 176 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 177 if (kcmsg == NULL) 178 return -ENOBUFS; 179 180 /* Now copy them over neatly. */ 181 memset(kcmsg, 0, kcmlen); 182 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 183 while (ucmsg != NULL) { 184 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 185 goto Efault; 186 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 187 goto Einval; 188 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 189 CMSG_ALIGN(sizeof(struct cmsghdr))); 190 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 191 goto Einval; 192 kcmsg->cmsg_len = tmp; 193 tmp = CMSG_ALIGN(tmp); 194 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 195 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 196 copy_from_user(CMSG_DATA(kcmsg), 197 CMSG_COMPAT_DATA(ucmsg), 198 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 199 goto Efault; 200 201 /* Advance. */ 202 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 203 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 204 } 205 206 /* Ok, looks like we made it. Hook it up and return success. */ 207 kmsg->msg_control = kcmsg_base; 208 kmsg->msg_controllen = kcmlen; 209 return 0; 210 211 Einval: 212 err = -EINVAL; 213 Efault: 214 if (kcmsg_base != (struct cmsghdr *)stackbuf) 215 sock_kfree_s(sk, kcmsg_base, kcmlen); 216 return err; 217 } 218 219 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 220 { 221 struct compat_timeval ctv; 222 struct compat_timespec cts[3]; 223 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 224 struct compat_cmsghdr cmhdr; 225 int cmlen; 226 227 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 228 kmsg->msg_flags |= MSG_CTRUNC; 229 return 0; /* XXX: return error? check spec. */ 230 } 231 232 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 233 struct timeval *tv = (struct timeval *)data; 234 ctv.tv_sec = tv->tv_sec; 235 ctv.tv_usec = tv->tv_usec; 236 data = &ctv; 237 len = sizeof(ctv); 238 } 239 if (level == SOL_SOCKET && 240 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 241 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 242 int i; 243 struct timespec *ts = (struct timespec *)data; 244 for (i = 0; i < count; i++) { 245 cts[i].tv_sec = ts[i].tv_sec; 246 cts[i].tv_nsec = ts[i].tv_nsec; 247 } 248 data = &cts; 249 len = sizeof(cts[0]) * count; 250 } 251 252 cmlen = CMSG_COMPAT_LEN(len); 253 if (kmsg->msg_controllen < cmlen) { 254 kmsg->msg_flags |= MSG_CTRUNC; 255 cmlen = kmsg->msg_controllen; 256 } 257 cmhdr.cmsg_level = level; 258 cmhdr.cmsg_type = type; 259 cmhdr.cmsg_len = cmlen; 260 261 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 262 return -EFAULT; 263 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 264 return -EFAULT; 265 cmlen = CMSG_COMPAT_SPACE(len); 266 if (kmsg->msg_controllen < cmlen) 267 cmlen = kmsg->msg_controllen; 268 kmsg->msg_control += cmlen; 269 kmsg->msg_controllen -= cmlen; 270 return 0; 271 } 272 273 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 274 { 275 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 276 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 277 int fdnum = scm->fp->count; 278 struct file **fp = scm->fp->fp; 279 int __user *cmfptr; 280 int err = 0, i; 281 282 if (fdnum < fdmax) 283 fdmax = fdnum; 284 285 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 286 int new_fd; 287 err = security_file_receive(fp[i]); 288 if (err) 289 break; 290 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 291 ? O_CLOEXEC : 0); 292 if (err < 0) 293 break; 294 new_fd = err; 295 err = put_user(new_fd, cmfptr); 296 if (err) { 297 put_unused_fd(new_fd); 298 break; 299 } 300 /* Bump the usage count and install the file. */ 301 get_file(fp[i]); 302 fd_install(new_fd, fp[i]); 303 } 304 305 if (i > 0) { 306 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 307 err = put_user(SOL_SOCKET, &cm->cmsg_level); 308 if (!err) 309 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 310 if (!err) 311 err = put_user(cmlen, &cm->cmsg_len); 312 if (!err) { 313 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 314 kmsg->msg_control += cmlen; 315 kmsg->msg_controllen -= cmlen; 316 } 317 } 318 if (i < fdnum) 319 kmsg->msg_flags |= MSG_CTRUNC; 320 321 /* 322 * All of the files that fit in the message have had their 323 * usage counts incremented, so we just free the list. 324 */ 325 __scm_destroy(scm); 326 } 327 328 /* 329 * A struct sock_filter is architecture independent. 330 */ 331 struct compat_sock_fprog { 332 u16 len; 333 compat_uptr_t filter; /* struct sock_filter * */ 334 }; 335 336 static int do_set_attach_filter(struct socket *sock, int level, int optname, 337 char __user *optval, unsigned int optlen) 338 { 339 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 340 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 341 compat_uptr_t ptr; 342 u16 len; 343 344 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 345 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 346 __get_user(len, &fprog32->len) || 347 __get_user(ptr, &fprog32->filter) || 348 __put_user(len, &kfprog->len) || 349 __put_user(compat_ptr(ptr), &kfprog->filter)) 350 return -EFAULT; 351 352 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 353 sizeof(struct sock_fprog)); 354 } 355 356 static int do_set_sock_timeout(struct socket *sock, int level, 357 int optname, char __user *optval, unsigned int optlen) 358 { 359 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 360 struct timeval ktime; 361 mm_segment_t old_fs; 362 int err; 363 364 if (optlen < sizeof(*up)) 365 return -EINVAL; 366 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 367 __get_user(ktime.tv_sec, &up->tv_sec) || 368 __get_user(ktime.tv_usec, &up->tv_usec)) 369 return -EFAULT; 370 old_fs = get_fs(); 371 set_fs(KERNEL_DS); 372 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 373 set_fs(old_fs); 374 375 return err; 376 } 377 378 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 379 char __user *optval, unsigned int optlen) 380 { 381 if (optname == SO_ATTACH_FILTER) 382 return do_set_attach_filter(sock, level, optname, 383 optval, optlen); 384 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 385 return do_set_sock_timeout(sock, level, optname, optval, optlen); 386 387 return sock_setsockopt(sock, level, optname, optval, optlen); 388 } 389 390 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 391 char __user *optval, unsigned int optlen) 392 { 393 int err; 394 struct socket *sock = sockfd_lookup(fd, &err); 395 396 if (sock) { 397 err = security_socket_setsockopt(sock, level, optname); 398 if (err) { 399 sockfd_put(sock); 400 return err; 401 } 402 403 if (level == SOL_SOCKET) 404 err = compat_sock_setsockopt(sock, level, 405 optname, optval, optlen); 406 else if (sock->ops->compat_setsockopt) 407 err = sock->ops->compat_setsockopt(sock, level, 408 optname, optval, optlen); 409 else 410 err = sock->ops->setsockopt(sock, level, 411 optname, optval, optlen); 412 sockfd_put(sock); 413 } 414 return err; 415 } 416 417 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 418 char __user *optval, int __user *optlen) 419 { 420 struct compat_timeval __user *up; 421 struct timeval ktime; 422 mm_segment_t old_fs; 423 int len, err; 424 425 up = (struct compat_timeval __user *) optval; 426 if (get_user(len, optlen)) 427 return -EFAULT; 428 if (len < sizeof(*up)) 429 return -EINVAL; 430 len = sizeof(ktime); 431 old_fs = get_fs(); 432 set_fs(KERNEL_DS); 433 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 434 set_fs(old_fs); 435 436 if (!err) { 437 if (put_user(sizeof(*up), optlen) || 438 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 439 __put_user(ktime.tv_sec, &up->tv_sec) || 440 __put_user(ktime.tv_usec, &up->tv_usec)) 441 err = -EFAULT; 442 } 443 return err; 444 } 445 446 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 447 char __user *optval, int __user *optlen) 448 { 449 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 450 return do_get_sock_timeout(sock, level, optname, optval, optlen); 451 return sock_getsockopt(sock, level, optname, optval, optlen); 452 } 453 454 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 455 { 456 struct compat_timeval __user *ctv = 457 (struct compat_timeval __user *) userstamp; 458 int err = -ENOENT; 459 struct timeval tv; 460 461 if (!sock_flag(sk, SOCK_TIMESTAMP)) 462 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 463 tv = ktime_to_timeval(sk->sk_stamp); 464 if (tv.tv_sec == -1) 465 return err; 466 if (tv.tv_sec == 0) { 467 sk->sk_stamp = ktime_get_real(); 468 tv = ktime_to_timeval(sk->sk_stamp); 469 } 470 err = 0; 471 if (put_user(tv.tv_sec, &ctv->tv_sec) || 472 put_user(tv.tv_usec, &ctv->tv_usec)) 473 err = -EFAULT; 474 return err; 475 } 476 EXPORT_SYMBOL(compat_sock_get_timestamp); 477 478 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 479 { 480 struct compat_timespec __user *ctv = 481 (struct compat_timespec __user *) userstamp; 482 int err = -ENOENT; 483 struct timespec ts; 484 485 if (!sock_flag(sk, SOCK_TIMESTAMP)) 486 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 487 ts = ktime_to_timespec(sk->sk_stamp); 488 if (ts.tv_sec == -1) 489 return err; 490 if (ts.tv_sec == 0) { 491 sk->sk_stamp = ktime_get_real(); 492 ts = ktime_to_timespec(sk->sk_stamp); 493 } 494 err = 0; 495 if (put_user(ts.tv_sec, &ctv->tv_sec) || 496 put_user(ts.tv_nsec, &ctv->tv_nsec)) 497 err = -EFAULT; 498 return err; 499 } 500 EXPORT_SYMBOL(compat_sock_get_timestampns); 501 502 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 503 char __user *optval, int __user *optlen) 504 { 505 int err; 506 struct socket *sock = sockfd_lookup(fd, &err); 507 508 if (sock) { 509 err = security_socket_getsockopt(sock, level, optname); 510 if (err) { 511 sockfd_put(sock); 512 return err; 513 } 514 515 if (level == SOL_SOCKET) 516 err = compat_sock_getsockopt(sock, level, 517 optname, optval, optlen); 518 else if (sock->ops->compat_getsockopt) 519 err = sock->ops->compat_getsockopt(sock, level, 520 optname, optval, optlen); 521 else 522 err = sock->ops->getsockopt(sock, level, 523 optname, optval, optlen); 524 sockfd_put(sock); 525 } 526 return err; 527 } 528 529 struct compat_group_req { 530 __u32 gr_interface; 531 struct __kernel_sockaddr_storage gr_group 532 __attribute__ ((aligned(4))); 533 } __packed; 534 535 struct compat_group_source_req { 536 __u32 gsr_interface; 537 struct __kernel_sockaddr_storage gsr_group 538 __attribute__ ((aligned(4))); 539 struct __kernel_sockaddr_storage gsr_source 540 __attribute__ ((aligned(4))); 541 } __packed; 542 543 struct compat_group_filter { 544 __u32 gf_interface; 545 struct __kernel_sockaddr_storage gf_group 546 __attribute__ ((aligned(4))); 547 __u32 gf_fmode; 548 __u32 gf_numsrc; 549 struct __kernel_sockaddr_storage gf_slist[1] 550 __attribute__ ((aligned(4))); 551 } __packed; 552 553 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 554 sizeof(struct __kernel_sockaddr_storage)) 555 556 557 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 558 char __user *optval, unsigned int optlen, 559 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 560 { 561 char __user *koptval = optval; 562 int koptlen = optlen; 563 564 switch (optname) { 565 case MCAST_JOIN_GROUP: 566 case MCAST_LEAVE_GROUP: 567 { 568 struct compat_group_req __user *gr32 = (void *)optval; 569 struct group_req __user *kgr = 570 compat_alloc_user_space(sizeof(struct group_req)); 571 u32 interface; 572 573 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 574 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 575 __get_user(interface, &gr32->gr_interface) || 576 __put_user(interface, &kgr->gr_interface) || 577 copy_in_user(&kgr->gr_group, &gr32->gr_group, 578 sizeof(kgr->gr_group))) 579 return -EFAULT; 580 koptval = (char __user *)kgr; 581 koptlen = sizeof(struct group_req); 582 break; 583 } 584 case MCAST_JOIN_SOURCE_GROUP: 585 case MCAST_LEAVE_SOURCE_GROUP: 586 case MCAST_BLOCK_SOURCE: 587 case MCAST_UNBLOCK_SOURCE: 588 { 589 struct compat_group_source_req __user *gsr32 = (void *)optval; 590 struct group_source_req __user *kgsr = compat_alloc_user_space( 591 sizeof(struct group_source_req)); 592 u32 interface; 593 594 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 595 !access_ok(VERIFY_WRITE, kgsr, 596 sizeof(struct group_source_req)) || 597 __get_user(interface, &gsr32->gsr_interface) || 598 __put_user(interface, &kgsr->gsr_interface) || 599 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 600 sizeof(kgsr->gsr_group)) || 601 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 602 sizeof(kgsr->gsr_source))) 603 return -EFAULT; 604 koptval = (char __user *)kgsr; 605 koptlen = sizeof(struct group_source_req); 606 break; 607 } 608 case MCAST_MSFILTER: 609 { 610 struct compat_group_filter __user *gf32 = (void *)optval; 611 struct group_filter __user *kgf; 612 u32 interface, fmode, numsrc; 613 614 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 615 __get_user(interface, &gf32->gf_interface) || 616 __get_user(fmode, &gf32->gf_fmode) || 617 __get_user(numsrc, &gf32->gf_numsrc)) 618 return -EFAULT; 619 koptlen = optlen + sizeof(struct group_filter) - 620 sizeof(struct compat_group_filter); 621 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 622 return -EINVAL; 623 kgf = compat_alloc_user_space(koptlen); 624 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 625 __put_user(interface, &kgf->gf_interface) || 626 __put_user(fmode, &kgf->gf_fmode) || 627 __put_user(numsrc, &kgf->gf_numsrc) || 628 copy_in_user(&kgf->gf_group, &gf32->gf_group, 629 sizeof(kgf->gf_group)) || 630 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 631 numsrc * sizeof(kgf->gf_slist[0])))) 632 return -EFAULT; 633 koptval = (char __user *)kgf; 634 break; 635 } 636 637 default: 638 break; 639 } 640 return setsockopt(sock, level, optname, koptval, koptlen); 641 } 642 EXPORT_SYMBOL(compat_mc_setsockopt); 643 644 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 645 char __user *optval, int __user *optlen, 646 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 647 { 648 struct compat_group_filter __user *gf32 = (void *)optval; 649 struct group_filter __user *kgf; 650 int __user *koptlen; 651 u32 interface, fmode, numsrc; 652 int klen, ulen, err; 653 654 if (optname != MCAST_MSFILTER) 655 return getsockopt(sock, level, optname, optval, optlen); 656 657 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 658 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 659 __get_user(ulen, optlen)) 660 return -EFAULT; 661 662 /* adjust len for pad */ 663 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 664 665 if (klen < GROUP_FILTER_SIZE(0)) 666 return -EINVAL; 667 668 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 669 __put_user(klen, koptlen)) 670 return -EFAULT; 671 672 /* have to allow space for previous compat_alloc_user_space, too */ 673 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 674 675 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 676 __get_user(interface, &gf32->gf_interface) || 677 __get_user(fmode, &gf32->gf_fmode) || 678 __get_user(numsrc, &gf32->gf_numsrc) || 679 __put_user(interface, &kgf->gf_interface) || 680 __put_user(fmode, &kgf->gf_fmode) || 681 __put_user(numsrc, &kgf->gf_numsrc) || 682 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 683 return -EFAULT; 684 685 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 686 if (err) 687 return err; 688 689 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 690 __get_user(klen, koptlen)) 691 return -EFAULT; 692 693 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 694 695 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 696 __put_user(ulen, optlen)) 697 return -EFAULT; 698 699 if (!access_ok(VERIFY_READ, kgf, klen) || 700 !access_ok(VERIFY_WRITE, gf32, ulen) || 701 __get_user(interface, &kgf->gf_interface) || 702 __get_user(fmode, &kgf->gf_fmode) || 703 __get_user(numsrc, &kgf->gf_numsrc) || 704 __put_user(interface, &gf32->gf_interface) || 705 __put_user(fmode, &gf32->gf_fmode) || 706 __put_user(numsrc, &gf32->gf_numsrc)) 707 return -EFAULT; 708 if (numsrc) { 709 int copylen; 710 711 klen -= GROUP_FILTER_SIZE(0); 712 copylen = numsrc * sizeof(gf32->gf_slist[0]); 713 if (copylen > klen) 714 copylen = klen; 715 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 716 return -EFAULT; 717 } 718 return err; 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[21] = { 726 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 727 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 728 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 729 AL(4), AL(5), AL(4) 730 }; 731 #undef AL 732 733 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 734 { 735 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 736 } 737 738 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, 739 unsigned vlen, unsigned int flags) 740 { 741 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 742 flags | MSG_CMSG_COMPAT); 743 } 744 745 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 746 { 747 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 748 } 749 750 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags) 751 { 752 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 753 } 754 755 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len, 756 unsigned flags, struct sockaddr __user *addr, 757 int __user *addrlen) 758 { 759 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 760 } 761 762 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, 763 unsigned vlen, unsigned int flags, 764 struct compat_timespec __user *timeout) 765 { 766 int datagrams; 767 struct timespec ktspec; 768 769 if (timeout == NULL) 770 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 771 flags | MSG_CMSG_COMPAT, NULL); 772 773 if (get_compat_timespec(&ktspec, timeout)) 774 return -EFAULT; 775 776 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 777 flags | MSG_CMSG_COMPAT, &ktspec); 778 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout)) 779 datagrams = -EFAULT; 780 781 return datagrams; 782 } 783 784 asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 785 { 786 int ret; 787 u32 a[6]; 788 u32 a0, a1; 789 790 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 791 return -EINVAL; 792 if (copy_from_user(a, args, nas[call])) 793 return -EFAULT; 794 a0 = a[0]; 795 a1 = a[1]; 796 797 switch (call) { 798 case SYS_SOCKET: 799 ret = sys_socket(a0, a1, a[2]); 800 break; 801 case SYS_BIND: 802 ret = sys_bind(a0, compat_ptr(a1), a[2]); 803 break; 804 case SYS_CONNECT: 805 ret = sys_connect(a0, compat_ptr(a1), a[2]); 806 break; 807 case SYS_LISTEN: 808 ret = sys_listen(a0, a1); 809 break; 810 case SYS_ACCEPT: 811 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 812 break; 813 case SYS_GETSOCKNAME: 814 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 815 break; 816 case SYS_GETPEERNAME: 817 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 818 break; 819 case SYS_SOCKETPAIR: 820 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 821 break; 822 case SYS_SEND: 823 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 824 break; 825 case SYS_SENDTO: 826 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 827 break; 828 case SYS_RECV: 829 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 830 break; 831 case SYS_RECVFROM: 832 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 833 compat_ptr(a[4]), compat_ptr(a[5])); 834 break; 835 case SYS_SHUTDOWN: 836 ret = sys_shutdown(a0, a1); 837 break; 838 case SYS_SETSOCKOPT: 839 ret = compat_sys_setsockopt(a0, a1, a[2], 840 compat_ptr(a[3]), a[4]); 841 break; 842 case SYS_GETSOCKOPT: 843 ret = compat_sys_getsockopt(a0, a1, a[2], 844 compat_ptr(a[3]), compat_ptr(a[4])); 845 break; 846 case SYS_SENDMSG: 847 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 848 break; 849 case SYS_SENDMMSG: 850 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 851 break; 852 case SYS_RECVMSG: 853 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 854 break; 855 case SYS_RECVMMSG: 856 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 857 compat_ptr(a[4])); 858 break; 859 case SYS_ACCEPT4: 860 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 861 break; 862 default: 863 ret = -EINVAL; 864 break; 865 } 866 return ret; 867 } 868