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 kmsg->msg_name = compat_ptr(tmp1); 75 kmsg->msg_iov = compat_ptr(tmp2); 76 kmsg->msg_control = compat_ptr(tmp3); 77 return 0; 78 } 79 80 /* I've named the args so it is easy to tell whose space the pointers are in. */ 81 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 82 struct sockaddr *kern_address, int mode) 83 { 84 int tot_len; 85 86 if (kern_msg->msg_namelen) { 87 if (mode == VERIFY_READ) { 88 int err = move_addr_to_kernel(kern_msg->msg_name, 89 kern_msg->msg_namelen, 90 kern_address); 91 if (err < 0) 92 return err; 93 } 94 kern_msg->msg_name = kern_address; 95 } else 96 kern_msg->msg_name = NULL; 97 98 tot_len = iov_from_user_compat_to_kern(kern_iov, 99 (struct compat_iovec __user *)kern_msg->msg_iov, 100 kern_msg->msg_iovlen); 101 if (tot_len >= 0) 102 kern_msg->msg_iov = kern_iov; 103 104 return tot_len; 105 } 106 107 /* Bleech... */ 108 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 109 110 #define CMSG_COMPAT_DATA(cmsg) \ 111 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 112 #define CMSG_COMPAT_SPACE(len) \ 113 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 114 #define CMSG_COMPAT_LEN(len) \ 115 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 116 117 #define CMSG_COMPAT_FIRSTHDR(msg) \ 118 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 119 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 120 (struct compat_cmsghdr __user *)NULL) 121 122 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 123 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 124 (ucmlen) <= (unsigned long) \ 125 ((mhdr)->msg_controllen - \ 126 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 127 128 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 129 struct compat_cmsghdr __user *cmsg, int cmsg_len) 130 { 131 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 132 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 133 msg->msg_controllen) 134 return NULL; 135 return (struct compat_cmsghdr __user *)ptr; 136 } 137 138 /* There is a lot of hair here because the alignment rules (and 139 * thus placement) of cmsg headers and length are different for 140 * 32-bit apps. -DaveM 141 */ 142 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 143 unsigned char *stackbuf, int stackbuf_size) 144 { 145 struct compat_cmsghdr __user *ucmsg; 146 struct cmsghdr *kcmsg, *kcmsg_base; 147 compat_size_t ucmlen; 148 __kernel_size_t kcmlen, tmp; 149 int err = -EFAULT; 150 151 kcmlen = 0; 152 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 153 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 154 while (ucmsg != NULL) { 155 if (get_user(ucmlen, &ucmsg->cmsg_len)) 156 return -EFAULT; 157 158 /* Catch bogons. */ 159 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 160 return -EINVAL; 161 162 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 163 CMSG_ALIGN(sizeof(struct cmsghdr))); 164 tmp = CMSG_ALIGN(tmp); 165 kcmlen += tmp; 166 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 167 } 168 if (kcmlen == 0) 169 return -EINVAL; 170 171 /* The kcmlen holds the 64-bit version of the control length. 172 * It may not be modified as we do not stick it into the kmsg 173 * until we have successfully copied over all of the data 174 * from the user. 175 */ 176 if (kcmlen > stackbuf_size) 177 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 178 if (kcmsg == NULL) 179 return -ENOBUFS; 180 181 /* Now copy them over neatly. */ 182 memset(kcmsg, 0, kcmlen); 183 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 184 while (ucmsg != NULL) { 185 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 186 goto Efault; 187 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 188 goto Einval; 189 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 190 CMSG_ALIGN(sizeof(struct cmsghdr))); 191 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 192 goto Einval; 193 kcmsg->cmsg_len = tmp; 194 tmp = CMSG_ALIGN(tmp); 195 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 196 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 197 copy_from_user(CMSG_DATA(kcmsg), 198 CMSG_COMPAT_DATA(ucmsg), 199 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 200 goto Efault; 201 202 /* Advance. */ 203 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 204 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 205 } 206 207 /* Ok, looks like we made it. Hook it up and return success. */ 208 kmsg->msg_control = kcmsg_base; 209 kmsg->msg_controllen = kcmlen; 210 return 0; 211 212 Einval: 213 err = -EINVAL; 214 Efault: 215 if (kcmsg_base != (struct cmsghdr *)stackbuf) 216 sock_kfree_s(sk, kcmsg_base, kcmlen); 217 return err; 218 } 219 220 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 221 { 222 struct compat_timeval ctv; 223 struct compat_timespec cts[3]; 224 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 225 struct compat_cmsghdr cmhdr; 226 int cmlen; 227 228 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 229 kmsg->msg_flags |= MSG_CTRUNC; 230 return 0; /* XXX: return error? check spec. */ 231 } 232 233 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 234 struct timeval *tv = (struct timeval *)data; 235 ctv.tv_sec = tv->tv_sec; 236 ctv.tv_usec = tv->tv_usec; 237 data = &ctv; 238 len = sizeof(ctv); 239 } 240 if (level == SOL_SOCKET && 241 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 242 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 243 int i; 244 struct timespec *ts = (struct timespec *)data; 245 for (i = 0; i < count; i++) { 246 cts[i].tv_sec = ts[i].tv_sec; 247 cts[i].tv_nsec = ts[i].tv_nsec; 248 } 249 data = &cts; 250 len = sizeof(cts[0]) * count; 251 } 252 253 cmlen = CMSG_COMPAT_LEN(len); 254 if (kmsg->msg_controllen < cmlen) { 255 kmsg->msg_flags |= MSG_CTRUNC; 256 cmlen = kmsg->msg_controllen; 257 } 258 cmhdr.cmsg_level = level; 259 cmhdr.cmsg_type = type; 260 cmhdr.cmsg_len = cmlen; 261 262 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 263 return -EFAULT; 264 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 265 return -EFAULT; 266 cmlen = CMSG_COMPAT_SPACE(len); 267 if (kmsg->msg_controllen < cmlen) 268 cmlen = kmsg->msg_controllen; 269 kmsg->msg_control += cmlen; 270 kmsg->msg_controllen -= cmlen; 271 return 0; 272 } 273 274 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 275 { 276 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 277 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 278 int fdnum = scm->fp->count; 279 struct file **fp = scm->fp->fp; 280 int __user *cmfptr; 281 int err = 0, i; 282 283 if (fdnum < fdmax) 284 fdmax = fdnum; 285 286 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 287 int new_fd; 288 err = security_file_receive(fp[i]); 289 if (err) 290 break; 291 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 292 ? O_CLOEXEC : 0); 293 if (err < 0) 294 break; 295 new_fd = err; 296 err = put_user(new_fd, cmfptr); 297 if (err) { 298 put_unused_fd(new_fd); 299 break; 300 } 301 /* Bump the usage count and install the file. */ 302 get_file(fp[i]); 303 fd_install(new_fd, fp[i]); 304 } 305 306 if (i > 0) { 307 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 308 err = put_user(SOL_SOCKET, &cm->cmsg_level); 309 if (!err) 310 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 311 if (!err) 312 err = put_user(cmlen, &cm->cmsg_len); 313 if (!err) { 314 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 315 kmsg->msg_control += cmlen; 316 kmsg->msg_controllen -= cmlen; 317 } 318 } 319 if (i < fdnum) 320 kmsg->msg_flags |= MSG_CTRUNC; 321 322 /* 323 * All of the files that fit in the message have had their 324 * usage counts incremented, so we just free the list. 325 */ 326 __scm_destroy(scm); 327 } 328 329 /* 330 * A struct sock_filter is architecture independent. 331 */ 332 struct compat_sock_fprog { 333 u16 len; 334 compat_uptr_t filter; /* struct sock_filter * */ 335 }; 336 337 static int do_set_attach_filter(struct socket *sock, int level, int optname, 338 char __user *optval, unsigned int optlen) 339 { 340 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 341 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 342 compat_uptr_t ptr; 343 u16 len; 344 345 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 346 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 347 __get_user(len, &fprog32->len) || 348 __get_user(ptr, &fprog32->filter) || 349 __put_user(len, &kfprog->len) || 350 __put_user(compat_ptr(ptr), &kfprog->filter)) 351 return -EFAULT; 352 353 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 354 sizeof(struct sock_fprog)); 355 } 356 357 static int do_set_sock_timeout(struct socket *sock, int level, 358 int optname, char __user *optval, unsigned int optlen) 359 { 360 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 361 struct timeval ktime; 362 mm_segment_t old_fs; 363 int err; 364 365 if (optlen < sizeof(*up)) 366 return -EINVAL; 367 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 368 __get_user(ktime.tv_sec, &up->tv_sec) || 369 __get_user(ktime.tv_usec, &up->tv_usec)) 370 return -EFAULT; 371 old_fs = get_fs(); 372 set_fs(KERNEL_DS); 373 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 374 set_fs(old_fs); 375 376 return err; 377 } 378 379 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 380 char __user *optval, unsigned int optlen) 381 { 382 if (optname == SO_ATTACH_FILTER) 383 return do_set_attach_filter(sock, level, optname, 384 optval, optlen); 385 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 386 return do_set_sock_timeout(sock, level, optname, optval, optlen); 387 388 return sock_setsockopt(sock, level, optname, optval, optlen); 389 } 390 391 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 392 char __user *optval, unsigned int optlen) 393 { 394 int err; 395 struct socket *sock = sockfd_lookup(fd, &err); 396 397 if (sock) { 398 err = security_socket_setsockopt(sock, level, optname); 399 if (err) { 400 sockfd_put(sock); 401 return err; 402 } 403 404 if (level == SOL_SOCKET) 405 err = compat_sock_setsockopt(sock, level, 406 optname, optval, optlen); 407 else if (sock->ops->compat_setsockopt) 408 err = sock->ops->compat_setsockopt(sock, level, 409 optname, optval, optlen); 410 else 411 err = sock->ops->setsockopt(sock, level, 412 optname, optval, optlen); 413 sockfd_put(sock); 414 } 415 return err; 416 } 417 418 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 419 char __user *optval, int __user *optlen) 420 { 421 struct compat_timeval __user *up; 422 struct timeval ktime; 423 mm_segment_t old_fs; 424 int len, err; 425 426 up = (struct compat_timeval __user *) optval; 427 if (get_user(len, optlen)) 428 return -EFAULT; 429 if (len < sizeof(*up)) 430 return -EINVAL; 431 len = sizeof(ktime); 432 old_fs = get_fs(); 433 set_fs(KERNEL_DS); 434 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 435 set_fs(old_fs); 436 437 if (!err) { 438 if (put_user(sizeof(*up), optlen) || 439 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 440 __put_user(ktime.tv_sec, &up->tv_sec) || 441 __put_user(ktime.tv_usec, &up->tv_usec)) 442 err = -EFAULT; 443 } 444 return err; 445 } 446 447 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 448 char __user *optval, int __user *optlen) 449 { 450 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 451 return do_get_sock_timeout(sock, level, optname, optval, optlen); 452 return sock_getsockopt(sock, level, optname, optval, optlen); 453 } 454 455 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 456 { 457 struct compat_timeval __user *ctv = 458 (struct compat_timeval __user *) userstamp; 459 int err = -ENOENT; 460 struct timeval tv; 461 462 if (!sock_flag(sk, SOCK_TIMESTAMP)) 463 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 464 tv = ktime_to_timeval(sk->sk_stamp); 465 if (tv.tv_sec == -1) 466 return err; 467 if (tv.tv_sec == 0) { 468 sk->sk_stamp = ktime_get_real(); 469 tv = ktime_to_timeval(sk->sk_stamp); 470 } 471 err = 0; 472 if (put_user(tv.tv_sec, &ctv->tv_sec) || 473 put_user(tv.tv_usec, &ctv->tv_usec)) 474 err = -EFAULT; 475 return err; 476 } 477 EXPORT_SYMBOL(compat_sock_get_timestamp); 478 479 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 480 { 481 struct compat_timespec __user *ctv = 482 (struct compat_timespec __user *) userstamp; 483 int err = -ENOENT; 484 struct timespec ts; 485 486 if (!sock_flag(sk, SOCK_TIMESTAMP)) 487 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 488 ts = ktime_to_timespec(sk->sk_stamp); 489 if (ts.tv_sec == -1) 490 return err; 491 if (ts.tv_sec == 0) { 492 sk->sk_stamp = ktime_get_real(); 493 ts = ktime_to_timespec(sk->sk_stamp); 494 } 495 err = 0; 496 if (put_user(ts.tv_sec, &ctv->tv_sec) || 497 put_user(ts.tv_nsec, &ctv->tv_nsec)) 498 err = -EFAULT; 499 return err; 500 } 501 EXPORT_SYMBOL(compat_sock_get_timestampns); 502 503 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 504 char __user *optval, int __user *optlen) 505 { 506 int err; 507 struct socket *sock = sockfd_lookup(fd, &err); 508 509 if (sock) { 510 err = security_socket_getsockopt(sock, level, optname); 511 if (err) { 512 sockfd_put(sock); 513 return err; 514 } 515 516 if (level == SOL_SOCKET) 517 err = compat_sock_getsockopt(sock, level, 518 optname, optval, optlen); 519 else if (sock->ops->compat_getsockopt) 520 err = sock->ops->compat_getsockopt(sock, level, 521 optname, optval, optlen); 522 else 523 err = sock->ops->getsockopt(sock, level, 524 optname, optval, optlen); 525 sockfd_put(sock); 526 } 527 return err; 528 } 529 530 struct compat_group_req { 531 __u32 gr_interface; 532 struct __kernel_sockaddr_storage gr_group 533 __attribute__ ((aligned(4))); 534 } __packed; 535 536 struct compat_group_source_req { 537 __u32 gsr_interface; 538 struct __kernel_sockaddr_storage gsr_group 539 __attribute__ ((aligned(4))); 540 struct __kernel_sockaddr_storage gsr_source 541 __attribute__ ((aligned(4))); 542 } __packed; 543 544 struct compat_group_filter { 545 __u32 gf_interface; 546 struct __kernel_sockaddr_storage gf_group 547 __attribute__ ((aligned(4))); 548 __u32 gf_fmode; 549 __u32 gf_numsrc; 550 struct __kernel_sockaddr_storage gf_slist[1] 551 __attribute__ ((aligned(4))); 552 } __packed; 553 554 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 555 sizeof(struct __kernel_sockaddr_storage)) 556 557 558 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 559 char __user *optval, unsigned int optlen, 560 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 561 { 562 char __user *koptval = optval; 563 int koptlen = optlen; 564 565 switch (optname) { 566 case MCAST_JOIN_GROUP: 567 case MCAST_LEAVE_GROUP: 568 { 569 struct compat_group_req __user *gr32 = (void *)optval; 570 struct group_req __user *kgr = 571 compat_alloc_user_space(sizeof(struct group_req)); 572 u32 interface; 573 574 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 575 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 576 __get_user(interface, &gr32->gr_interface) || 577 __put_user(interface, &kgr->gr_interface) || 578 copy_in_user(&kgr->gr_group, &gr32->gr_group, 579 sizeof(kgr->gr_group))) 580 return -EFAULT; 581 koptval = (char __user *)kgr; 582 koptlen = sizeof(struct group_req); 583 break; 584 } 585 case MCAST_JOIN_SOURCE_GROUP: 586 case MCAST_LEAVE_SOURCE_GROUP: 587 case MCAST_BLOCK_SOURCE: 588 case MCAST_UNBLOCK_SOURCE: 589 { 590 struct compat_group_source_req __user *gsr32 = (void *)optval; 591 struct group_source_req __user *kgsr = compat_alloc_user_space( 592 sizeof(struct group_source_req)); 593 u32 interface; 594 595 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 596 !access_ok(VERIFY_WRITE, kgsr, 597 sizeof(struct group_source_req)) || 598 __get_user(interface, &gsr32->gsr_interface) || 599 __put_user(interface, &kgsr->gsr_interface) || 600 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 601 sizeof(kgsr->gsr_group)) || 602 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 603 sizeof(kgsr->gsr_source))) 604 return -EFAULT; 605 koptval = (char __user *)kgsr; 606 koptlen = sizeof(struct group_source_req); 607 break; 608 } 609 case MCAST_MSFILTER: 610 { 611 struct compat_group_filter __user *gf32 = (void *)optval; 612 struct group_filter __user *kgf; 613 u32 interface, fmode, numsrc; 614 615 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 616 __get_user(interface, &gf32->gf_interface) || 617 __get_user(fmode, &gf32->gf_fmode) || 618 __get_user(numsrc, &gf32->gf_numsrc)) 619 return -EFAULT; 620 koptlen = optlen + sizeof(struct group_filter) - 621 sizeof(struct compat_group_filter); 622 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 623 return -EINVAL; 624 kgf = compat_alloc_user_space(koptlen); 625 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 626 __put_user(interface, &kgf->gf_interface) || 627 __put_user(fmode, &kgf->gf_fmode) || 628 __put_user(numsrc, &kgf->gf_numsrc) || 629 copy_in_user(&kgf->gf_group, &gf32->gf_group, 630 sizeof(kgf->gf_group)) || 631 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 632 numsrc * sizeof(kgf->gf_slist[0])))) 633 return -EFAULT; 634 koptval = (char __user *)kgf; 635 break; 636 } 637 638 default: 639 break; 640 } 641 return setsockopt(sock, level, optname, koptval, koptlen); 642 } 643 EXPORT_SYMBOL(compat_mc_setsockopt); 644 645 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 646 char __user *optval, int __user *optlen, 647 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 648 { 649 struct compat_group_filter __user *gf32 = (void *)optval; 650 struct group_filter __user *kgf; 651 int __user *koptlen; 652 u32 interface, fmode, numsrc; 653 int klen, ulen, err; 654 655 if (optname != MCAST_MSFILTER) 656 return getsockopt(sock, level, optname, optval, optlen); 657 658 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 659 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 660 __get_user(ulen, optlen)) 661 return -EFAULT; 662 663 /* adjust len for pad */ 664 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 665 666 if (klen < GROUP_FILTER_SIZE(0)) 667 return -EINVAL; 668 669 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 670 __put_user(klen, koptlen)) 671 return -EFAULT; 672 673 /* have to allow space for previous compat_alloc_user_space, too */ 674 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 675 676 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 677 __get_user(interface, &gf32->gf_interface) || 678 __get_user(fmode, &gf32->gf_fmode) || 679 __get_user(numsrc, &gf32->gf_numsrc) || 680 __put_user(interface, &kgf->gf_interface) || 681 __put_user(fmode, &kgf->gf_fmode) || 682 __put_user(numsrc, &kgf->gf_numsrc) || 683 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 684 return -EFAULT; 685 686 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 687 if (err) 688 return err; 689 690 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 691 __get_user(klen, koptlen)) 692 return -EFAULT; 693 694 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 695 696 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 697 __put_user(ulen, optlen)) 698 return -EFAULT; 699 700 if (!access_ok(VERIFY_READ, kgf, klen) || 701 !access_ok(VERIFY_WRITE, gf32, ulen) || 702 __get_user(interface, &kgf->gf_interface) || 703 __get_user(fmode, &kgf->gf_fmode) || 704 __get_user(numsrc, &kgf->gf_numsrc) || 705 __put_user(interface, &gf32->gf_interface) || 706 __put_user(fmode, &gf32->gf_fmode) || 707 __put_user(numsrc, &gf32->gf_numsrc)) 708 return -EFAULT; 709 if (numsrc) { 710 int copylen; 711 712 klen -= GROUP_FILTER_SIZE(0); 713 copylen = numsrc * sizeof(gf32->gf_slist[0]); 714 if (copylen > klen) 715 copylen = klen; 716 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 717 return -EFAULT; 718 } 719 return err; 720 } 721 EXPORT_SYMBOL(compat_mc_getsockopt); 722 723 724 /* Argument list sizes for compat_sys_socketcall */ 725 #define AL(x) ((x) * sizeof(u32)) 726 static unsigned char nas[21] = { 727 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 728 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 729 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 730 AL(4), AL(5), AL(4) 731 }; 732 #undef AL 733 734 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 735 { 736 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 737 } 738 739 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, 740 unsigned vlen, unsigned int flags) 741 { 742 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 743 flags | MSG_CMSG_COMPAT); 744 } 745 746 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 747 { 748 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 749 } 750 751 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags) 752 { 753 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 754 } 755 756 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len, 757 unsigned flags, struct sockaddr __user *addr, 758 int __user *addrlen) 759 { 760 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 761 } 762 763 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, 764 unsigned vlen, unsigned int flags, 765 struct compat_timespec __user *timeout) 766 { 767 int datagrams; 768 struct timespec ktspec; 769 770 if (timeout == NULL) 771 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 772 flags | MSG_CMSG_COMPAT, NULL); 773 774 if (get_compat_timespec(&ktspec, timeout)) 775 return -EFAULT; 776 777 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 778 flags | MSG_CMSG_COMPAT, &ktspec); 779 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout)) 780 datagrams = -EFAULT; 781 782 return datagrams; 783 } 784 785 asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 786 { 787 int ret; 788 u32 a[6]; 789 u32 a0, a1; 790 791 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 792 return -EINVAL; 793 if (copy_from_user(a, args, nas[call])) 794 return -EFAULT; 795 a0 = a[0]; 796 a1 = a[1]; 797 798 switch (call) { 799 case SYS_SOCKET: 800 ret = sys_socket(a0, a1, a[2]); 801 break; 802 case SYS_BIND: 803 ret = sys_bind(a0, compat_ptr(a1), a[2]); 804 break; 805 case SYS_CONNECT: 806 ret = sys_connect(a0, compat_ptr(a1), a[2]); 807 break; 808 case SYS_LISTEN: 809 ret = sys_listen(a0, a1); 810 break; 811 case SYS_ACCEPT: 812 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 813 break; 814 case SYS_GETSOCKNAME: 815 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 816 break; 817 case SYS_GETPEERNAME: 818 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 819 break; 820 case SYS_SOCKETPAIR: 821 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 822 break; 823 case SYS_SEND: 824 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 825 break; 826 case SYS_SENDTO: 827 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 828 break; 829 case SYS_RECV: 830 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 831 break; 832 case SYS_RECVFROM: 833 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 834 compat_ptr(a[4]), compat_ptr(a[5])); 835 break; 836 case SYS_SHUTDOWN: 837 ret = sys_shutdown(a0, a1); 838 break; 839 case SYS_SETSOCKOPT: 840 ret = compat_sys_setsockopt(a0, a1, a[2], 841 compat_ptr(a[3]), a[4]); 842 break; 843 case SYS_GETSOCKOPT: 844 ret = compat_sys_getsockopt(a0, a1, a[2], 845 compat_ptr(a[3]), compat_ptr(a[4])); 846 break; 847 case SYS_SENDMSG: 848 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 849 break; 850 case SYS_SENDMMSG: 851 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 852 break; 853 case SYS_RECVMSG: 854 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 855 break; 856 case SYS_RECVMMSG: 857 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 858 compat_ptr(a[4])); 859 break; 860 case SYS_ACCEPT4: 861 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 862 break; 863 default: 864 ret = -EINVAL; 865 break; 866 } 867 return ret; 868 } 869