1 /* 2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c. 3 * 4 * Copyright (C) 2000 VA Linux Co 5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> 6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> 7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) 9 * Copyright (C) 2000 Hewlett-Packard Co. 10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> 11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/gfp.h> 16 #include <linux/fs.h> 17 #include <linux/types.h> 18 #include <linux/file.h> 19 #include <linux/icmpv6.h> 20 #include <linux/socket.h> 21 #include <linux/syscalls.h> 22 #include <linux/filter.h> 23 #include <linux/compat.h> 24 #include <linux/security.h> 25 #include <linux/audit.h> 26 #include <linux/export.h> 27 28 #include <net/scm.h> 29 #include <net/sock.h> 30 #include <net/ip.h> 31 #include <net/ipv6.h> 32 #include <linux/uaccess.h> 33 #include <net/compat.h> 34 35 int get_compat_msghdr(struct msghdr *kmsg, 36 struct compat_msghdr __user *umsg, 37 struct sockaddr __user **save_addr, 38 struct iovec **iov) 39 { 40 struct compat_msghdr msg; 41 ssize_t err; 42 43 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 44 return -EFAULT; 45 46 kmsg->msg_flags = msg.msg_flags; 47 kmsg->msg_namelen = msg.msg_namelen; 48 49 if (!msg.msg_name) 50 kmsg->msg_namelen = 0; 51 52 if (kmsg->msg_namelen < 0) 53 return -EINVAL; 54 55 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 56 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 57 58 kmsg->msg_control = compat_ptr(msg.msg_control); 59 kmsg->msg_controllen = msg.msg_controllen; 60 61 if (save_addr) 62 *save_addr = compat_ptr(msg.msg_name); 63 64 if (msg.msg_name && kmsg->msg_namelen) { 65 if (!save_addr) { 66 err = move_addr_to_kernel(compat_ptr(msg.msg_name), 67 kmsg->msg_namelen, 68 kmsg->msg_name); 69 if (err < 0) 70 return err; 71 } 72 } else { 73 kmsg->msg_name = NULL; 74 kmsg->msg_namelen = 0; 75 } 76 77 if (msg.msg_iovlen > UIO_MAXIOV) 78 return -EMSGSIZE; 79 80 kmsg->msg_iocb = NULL; 81 82 return compat_import_iovec(save_addr ? READ : WRITE, 83 compat_ptr(msg.msg_iov), msg.msg_iovlen, 84 UIO_FASTIOV, iov, &kmsg->msg_iter); 85 } 86 87 /* Bleech... */ 88 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 89 90 #define CMSG_COMPAT_DATA(cmsg) \ 91 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr))) 92 #define CMSG_COMPAT_SPACE(len) \ 93 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) 94 #define CMSG_COMPAT_LEN(len) \ 95 (sizeof(struct compat_cmsghdr) + (len)) 96 97 #define CMSG_COMPAT_FIRSTHDR(msg) \ 98 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 99 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 100 (struct compat_cmsghdr __user *)NULL) 101 102 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 103 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 104 (ucmlen) <= (unsigned long) \ 105 ((mhdr)->msg_controllen - \ 106 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 107 108 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 109 struct compat_cmsghdr __user *cmsg, int cmsg_len) 110 { 111 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 112 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 113 msg->msg_controllen) 114 return NULL; 115 return (struct compat_cmsghdr __user *)ptr; 116 } 117 118 /* There is a lot of hair here because the alignment rules (and 119 * thus placement) of cmsg headers and length are different for 120 * 32-bit apps. -DaveM 121 */ 122 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 123 unsigned char *stackbuf, int stackbuf_size) 124 { 125 struct compat_cmsghdr __user *ucmsg; 126 struct cmsghdr *kcmsg, *kcmsg_base; 127 compat_size_t ucmlen; 128 __kernel_size_t kcmlen, tmp; 129 int err = -EFAULT; 130 131 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != 132 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); 133 134 kcmlen = 0; 135 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 136 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 137 while (ucmsg != NULL) { 138 if (get_user(ucmlen, &ucmsg->cmsg_len)) 139 return -EFAULT; 140 141 /* Catch bogons. */ 142 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 143 return -EINVAL; 144 145 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 146 tmp = CMSG_ALIGN(tmp); 147 kcmlen += tmp; 148 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 149 } 150 if (kcmlen == 0) 151 return -EINVAL; 152 153 /* The kcmlen holds the 64-bit version of the control length. 154 * It may not be modified as we do not stick it into the kmsg 155 * until we have successfully copied over all of the data 156 * from the user. 157 */ 158 if (kcmlen > stackbuf_size) 159 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 160 if (kcmsg == NULL) 161 return -ENOBUFS; 162 163 /* Now copy them over neatly. */ 164 memset(kcmsg, 0, kcmlen); 165 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 166 while (ucmsg != NULL) { 167 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 168 goto Efault; 169 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 170 goto Einval; 171 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 172 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 173 goto Einval; 174 kcmsg->cmsg_len = tmp; 175 tmp = CMSG_ALIGN(tmp); 176 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 177 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 178 copy_from_user(CMSG_DATA(kcmsg), 179 CMSG_COMPAT_DATA(ucmsg), 180 (ucmlen - sizeof(*ucmsg)))) 181 goto Efault; 182 183 /* Advance. */ 184 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 185 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 186 } 187 188 /* 189 * check the length of messages copied in is the same as the 190 * what we get from the first loop 191 */ 192 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen) 193 goto Einval; 194 195 /* Ok, looks like we made it. Hook it up and return success. */ 196 kmsg->msg_control = kcmsg_base; 197 kmsg->msg_controllen = kcmlen; 198 return 0; 199 200 Einval: 201 err = -EINVAL; 202 Efault: 203 if (kcmsg_base != (struct cmsghdr *)stackbuf) 204 sock_kfree_s(sk, kcmsg_base, kcmlen); 205 return err; 206 } 207 208 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 209 { 210 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 211 struct compat_cmsghdr cmhdr; 212 struct old_timeval32 ctv; 213 struct old_timespec32 cts[3]; 214 int cmlen; 215 216 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 217 kmsg->msg_flags |= MSG_CTRUNC; 218 return 0; /* XXX: return error? check spec. */ 219 } 220 221 if (!COMPAT_USE_64BIT_TIME) { 222 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) { 223 struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data; 224 ctv.tv_sec = tv->tv_sec; 225 ctv.tv_usec = tv->tv_usec; 226 data = &ctv; 227 len = sizeof(ctv); 228 } 229 if (level == SOL_SOCKET && 230 (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) { 231 int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3; 232 int i; 233 struct timespec *ts = (struct timespec *)data; 234 for (i = 0; i < count; i++) { 235 cts[i].tv_sec = ts[i].tv_sec; 236 cts[i].tv_nsec = ts[i].tv_nsec; 237 } 238 data = &cts; 239 len = sizeof(cts[0]) * count; 240 } 241 } 242 243 cmlen = CMSG_COMPAT_LEN(len); 244 if (kmsg->msg_controllen < cmlen) { 245 kmsg->msg_flags |= MSG_CTRUNC; 246 cmlen = kmsg->msg_controllen; 247 } 248 cmhdr.cmsg_level = level; 249 cmhdr.cmsg_type = type; 250 cmhdr.cmsg_len = cmlen; 251 252 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 253 return -EFAULT; 254 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 255 return -EFAULT; 256 cmlen = CMSG_COMPAT_SPACE(len); 257 if (kmsg->msg_controllen < cmlen) 258 cmlen = kmsg->msg_controllen; 259 kmsg->msg_control += cmlen; 260 kmsg->msg_controllen -= cmlen; 261 return 0; 262 } 263 264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 265 { 266 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 267 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 268 int fdnum = scm->fp->count; 269 struct file **fp = scm->fp->fp; 270 int __user *cmfptr; 271 int err = 0, i; 272 273 if (fdnum < fdmax) 274 fdmax = fdnum; 275 276 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 277 int new_fd; 278 err = security_file_receive(fp[i]); 279 if (err) 280 break; 281 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 282 ? O_CLOEXEC : 0); 283 if (err < 0) 284 break; 285 new_fd = err; 286 err = put_user(new_fd, cmfptr); 287 if (err) { 288 put_unused_fd(new_fd); 289 break; 290 } 291 /* Bump the usage count and install the file. */ 292 fd_install(new_fd, get_file(fp[i])); 293 } 294 295 if (i > 0) { 296 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 297 err = put_user(SOL_SOCKET, &cm->cmsg_level); 298 if (!err) 299 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 300 if (!err) 301 err = put_user(cmlen, &cm->cmsg_len); 302 if (!err) { 303 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 304 kmsg->msg_control += cmlen; 305 kmsg->msg_controllen -= cmlen; 306 } 307 } 308 if (i < fdnum) 309 kmsg->msg_flags |= MSG_CTRUNC; 310 311 /* 312 * All of the files that fit in the message have had their 313 * usage counts incremented, so we just free the list. 314 */ 315 __scm_destroy(scm); 316 } 317 318 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 319 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 320 { 321 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 322 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 323 struct compat_sock_fprog f32; 324 struct sock_fprog f; 325 326 if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) 327 return NULL; 328 memset(&f, 0, sizeof(f)); 329 f.len = f32.len; 330 f.filter = compat_ptr(f32.filter); 331 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) 332 return NULL; 333 334 return kfprog; 335 } 336 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 337 338 static int do_set_attach_filter(struct socket *sock, int level, int optname, 339 char __user *optval, unsigned int optlen) 340 { 341 struct sock_fprog __user *kfprog; 342 343 kfprog = get_compat_bpf_fprog(optval); 344 if (!kfprog) 345 return -EFAULT; 346 347 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 348 sizeof(struct sock_fprog)); 349 } 350 351 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 352 char __user *optval, unsigned int optlen) 353 { 354 if (optname == SO_ATTACH_FILTER || 355 optname == SO_ATTACH_REUSEPORT_CBPF) 356 return do_set_attach_filter(sock, level, optname, 357 optval, optlen); 358 return sock_setsockopt(sock, level, optname, optval, optlen); 359 } 360 361 static int __compat_sys_setsockopt(int fd, int level, int optname, 362 char __user *optval, unsigned int optlen) 363 { 364 int err; 365 struct socket *sock; 366 367 if (optlen > INT_MAX) 368 return -EINVAL; 369 370 sock = sockfd_lookup(fd, &err); 371 if (sock) { 372 err = security_socket_setsockopt(sock, level, optname); 373 if (err) { 374 sockfd_put(sock); 375 return err; 376 } 377 378 if (level == SOL_SOCKET) 379 err = compat_sock_setsockopt(sock, level, 380 optname, optval, optlen); 381 else if (sock->ops->compat_setsockopt) 382 err = sock->ops->compat_setsockopt(sock, level, 383 optname, optval, optlen); 384 else 385 err = sock->ops->setsockopt(sock, level, 386 optname, optval, optlen); 387 sockfd_put(sock); 388 } 389 return err; 390 } 391 392 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 393 char __user *, optval, unsigned int, optlen) 394 { 395 return __compat_sys_setsockopt(fd, level, optname, optval, optlen); 396 } 397 398 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 399 { 400 struct compat_timeval __user *ctv; 401 int err; 402 struct timeval tv; 403 404 if (COMPAT_USE_64BIT_TIME) 405 return sock_get_timestamp(sk, userstamp); 406 407 ctv = (struct compat_timeval __user *) userstamp; 408 err = -ENOENT; 409 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 410 tv = ktime_to_timeval(sock_read_timestamp(sk)); 411 412 if (tv.tv_sec == -1) 413 return err; 414 if (tv.tv_sec == 0) { 415 ktime_t kt = ktime_get_real(); 416 sock_write_timestamp(sk, kt); 417 tv = ktime_to_timeval(kt); 418 } 419 err = 0; 420 if (put_user(tv.tv_sec, &ctv->tv_sec) || 421 put_user(tv.tv_usec, &ctv->tv_usec)) 422 err = -EFAULT; 423 return err; 424 } 425 EXPORT_SYMBOL(compat_sock_get_timestamp); 426 427 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 428 { 429 struct compat_timespec __user *ctv; 430 int err; 431 struct timespec ts; 432 433 if (COMPAT_USE_64BIT_TIME) 434 return sock_get_timestampns (sk, userstamp); 435 436 ctv = (struct compat_timespec __user *) userstamp; 437 err = -ENOENT; 438 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 439 ts = ktime_to_timespec(sock_read_timestamp(sk)); 440 if (ts.tv_sec == -1) 441 return err; 442 if (ts.tv_sec == 0) { 443 ktime_t kt = ktime_get_real(); 444 sock_write_timestamp(sk, kt); 445 ts = ktime_to_timespec(kt); 446 } 447 err = 0; 448 if (put_user(ts.tv_sec, &ctv->tv_sec) || 449 put_user(ts.tv_nsec, &ctv->tv_nsec)) 450 err = -EFAULT; 451 return err; 452 } 453 EXPORT_SYMBOL(compat_sock_get_timestampns); 454 455 static int __compat_sys_getsockopt(int fd, int level, int optname, 456 char __user *optval, 457 int __user *optlen) 458 { 459 int err; 460 struct socket *sock = sockfd_lookup(fd, &err); 461 462 if (sock) { 463 err = security_socket_getsockopt(sock, level, optname); 464 if (err) { 465 sockfd_put(sock); 466 return err; 467 } 468 469 if (level == SOL_SOCKET) 470 err = sock_getsockopt(sock, level, 471 optname, optval, optlen); 472 else if (sock->ops->compat_getsockopt) 473 err = sock->ops->compat_getsockopt(sock, level, 474 optname, optval, optlen); 475 else 476 err = sock->ops->getsockopt(sock, level, 477 optname, optval, optlen); 478 sockfd_put(sock); 479 } 480 return err; 481 } 482 483 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 484 char __user *, optval, int __user *, optlen) 485 { 486 return __compat_sys_getsockopt(fd, level, optname, optval, optlen); 487 } 488 489 struct compat_group_req { 490 __u32 gr_interface; 491 struct __kernel_sockaddr_storage gr_group 492 __aligned(4); 493 } __packed; 494 495 struct compat_group_source_req { 496 __u32 gsr_interface; 497 struct __kernel_sockaddr_storage gsr_group 498 __aligned(4); 499 struct __kernel_sockaddr_storage gsr_source 500 __aligned(4); 501 } __packed; 502 503 struct compat_group_filter { 504 __u32 gf_interface; 505 struct __kernel_sockaddr_storage gf_group 506 __aligned(4); 507 __u32 gf_fmode; 508 __u32 gf_numsrc; 509 struct __kernel_sockaddr_storage gf_slist[1] 510 __aligned(4); 511 } __packed; 512 513 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 514 sizeof(struct __kernel_sockaddr_storage)) 515 516 517 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 518 char __user *optval, unsigned int optlen, 519 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 520 { 521 char __user *koptval = optval; 522 int koptlen = optlen; 523 524 switch (optname) { 525 case MCAST_JOIN_GROUP: 526 case MCAST_LEAVE_GROUP: 527 { 528 struct compat_group_req __user *gr32 = (void __user *)optval; 529 struct group_req __user *kgr = 530 compat_alloc_user_space(sizeof(struct group_req)); 531 u32 interface; 532 533 if (!access_ok(gr32, sizeof(*gr32)) || 534 !access_ok(kgr, sizeof(struct group_req)) || 535 __get_user(interface, &gr32->gr_interface) || 536 __put_user(interface, &kgr->gr_interface) || 537 copy_in_user(&kgr->gr_group, &gr32->gr_group, 538 sizeof(kgr->gr_group))) 539 return -EFAULT; 540 koptval = (char __user *)kgr; 541 koptlen = sizeof(struct group_req); 542 break; 543 } 544 case MCAST_JOIN_SOURCE_GROUP: 545 case MCAST_LEAVE_SOURCE_GROUP: 546 case MCAST_BLOCK_SOURCE: 547 case MCAST_UNBLOCK_SOURCE: 548 { 549 struct compat_group_source_req __user *gsr32 = (void __user *)optval; 550 struct group_source_req __user *kgsr = compat_alloc_user_space( 551 sizeof(struct group_source_req)); 552 u32 interface; 553 554 if (!access_ok(gsr32, sizeof(*gsr32)) || 555 !access_ok(kgsr, 556 sizeof(struct group_source_req)) || 557 __get_user(interface, &gsr32->gsr_interface) || 558 __put_user(interface, &kgsr->gsr_interface) || 559 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 560 sizeof(kgsr->gsr_group)) || 561 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 562 sizeof(kgsr->gsr_source))) 563 return -EFAULT; 564 koptval = (char __user *)kgsr; 565 koptlen = sizeof(struct group_source_req); 566 break; 567 } 568 case MCAST_MSFILTER: 569 { 570 struct compat_group_filter __user *gf32 = (void __user *)optval; 571 struct group_filter __user *kgf; 572 u32 interface, fmode, numsrc; 573 574 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 575 __get_user(interface, &gf32->gf_interface) || 576 __get_user(fmode, &gf32->gf_fmode) || 577 __get_user(numsrc, &gf32->gf_numsrc)) 578 return -EFAULT; 579 koptlen = optlen + sizeof(struct group_filter) - 580 sizeof(struct compat_group_filter); 581 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 582 return -EINVAL; 583 kgf = compat_alloc_user_space(koptlen); 584 if (!access_ok(kgf, koptlen) || 585 __put_user(interface, &kgf->gf_interface) || 586 __put_user(fmode, &kgf->gf_fmode) || 587 __put_user(numsrc, &kgf->gf_numsrc) || 588 copy_in_user(&kgf->gf_group, &gf32->gf_group, 589 sizeof(kgf->gf_group)) || 590 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 591 numsrc * sizeof(kgf->gf_slist[0])))) 592 return -EFAULT; 593 koptval = (char __user *)kgf; 594 break; 595 } 596 597 default: 598 break; 599 } 600 return setsockopt(sock, level, optname, koptval, koptlen); 601 } 602 EXPORT_SYMBOL(compat_mc_setsockopt); 603 604 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 605 char __user *optval, int __user *optlen, 606 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 607 { 608 struct compat_group_filter __user *gf32 = (void __user *)optval; 609 struct group_filter __user *kgf; 610 int __user *koptlen; 611 u32 interface, fmode, numsrc; 612 int klen, ulen, err; 613 614 if (optname != MCAST_MSFILTER) 615 return getsockopt(sock, level, optname, optval, optlen); 616 617 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 618 if (!access_ok(optlen, sizeof(*optlen)) || 619 __get_user(ulen, optlen)) 620 return -EFAULT; 621 622 /* adjust len for pad */ 623 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 624 625 if (klen < GROUP_FILTER_SIZE(0)) 626 return -EINVAL; 627 628 if (!access_ok(koptlen, sizeof(*koptlen)) || 629 __put_user(klen, koptlen)) 630 return -EFAULT; 631 632 /* have to allow space for previous compat_alloc_user_space, too */ 633 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 634 635 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 636 __get_user(interface, &gf32->gf_interface) || 637 __get_user(fmode, &gf32->gf_fmode) || 638 __get_user(numsrc, &gf32->gf_numsrc) || 639 __put_user(interface, &kgf->gf_interface) || 640 __put_user(fmode, &kgf->gf_fmode) || 641 __put_user(numsrc, &kgf->gf_numsrc) || 642 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 643 return -EFAULT; 644 645 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 646 if (err) 647 return err; 648 649 if (!access_ok(koptlen, sizeof(*koptlen)) || 650 __get_user(klen, koptlen)) 651 return -EFAULT; 652 653 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 654 655 if (!access_ok(optlen, sizeof(*optlen)) || 656 __put_user(ulen, optlen)) 657 return -EFAULT; 658 659 if (!access_ok(kgf, klen) || 660 !access_ok(gf32, ulen) || 661 __get_user(interface, &kgf->gf_interface) || 662 __get_user(fmode, &kgf->gf_fmode) || 663 __get_user(numsrc, &kgf->gf_numsrc) || 664 __put_user(interface, &gf32->gf_interface) || 665 __put_user(fmode, &gf32->gf_fmode) || 666 __put_user(numsrc, &gf32->gf_numsrc)) 667 return -EFAULT; 668 if (numsrc) { 669 int copylen; 670 671 klen -= GROUP_FILTER_SIZE(0); 672 copylen = numsrc * sizeof(gf32->gf_slist[0]); 673 if (copylen > klen) 674 copylen = klen; 675 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 676 return -EFAULT; 677 } 678 return err; 679 } 680 EXPORT_SYMBOL(compat_mc_getsockopt); 681 682 683 /* Argument list sizes for compat_sys_socketcall */ 684 #define AL(x) ((x) * sizeof(u32)) 685 static unsigned char nas[21] = { 686 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 687 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 688 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 689 AL(4), AL(5), AL(4) 690 }; 691 #undef AL 692 693 static inline long __compat_sys_sendmsg(int fd, 694 struct compat_msghdr __user *msg, 695 unsigned int flags) 696 { 697 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, 698 flags | MSG_CMSG_COMPAT, false); 699 } 700 701 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, 702 unsigned int, flags) 703 { 704 return __compat_sys_sendmsg(fd, msg, flags); 705 } 706 707 static inline long __compat_sys_sendmmsg(int fd, 708 struct compat_mmsghdr __user *mmsg, 709 unsigned int vlen, unsigned int flags) 710 { 711 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 712 flags | MSG_CMSG_COMPAT, false); 713 } 714 715 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 716 unsigned int, vlen, unsigned int, flags) 717 { 718 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); 719 } 720 721 static inline long __compat_sys_recvmsg(int fd, 722 struct compat_msghdr __user *msg, 723 unsigned int flags) 724 { 725 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, 726 flags | MSG_CMSG_COMPAT, false); 727 } 728 729 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, 730 unsigned int, flags) 731 { 732 return __compat_sys_recvmsg(fd, msg, flags); 733 } 734 735 static inline long __compat_sys_recvfrom(int fd, void __user *buf, 736 compat_size_t len, unsigned int flags, 737 struct sockaddr __user *addr, 738 int __user *addrlen) 739 { 740 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, 741 addrlen); 742 } 743 744 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 745 { 746 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); 747 } 748 749 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 750 unsigned int, flags, struct sockaddr __user *, addr, 751 int __user *, addrlen) 752 { 753 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); 754 } 755 756 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg, 757 unsigned int, vlen, unsigned int, flags, 758 struct __kernel_timespec __user *, timeout) 759 { 760 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 761 flags | MSG_CMSG_COMPAT, timeout, NULL); 762 } 763 764 #ifdef CONFIG_COMPAT_32BIT_TIME 765 COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg, 766 unsigned int, vlen, unsigned int, flags, 767 struct old_timespec32 __user *, timeout) 768 { 769 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 770 flags | MSG_CMSG_COMPAT, NULL, timeout); 771 } 772 #endif 773 774 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 775 { 776 u32 a[AUDITSC_ARGS]; 777 unsigned int len; 778 u32 a0, a1; 779 int ret; 780 781 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 782 return -EINVAL; 783 len = nas[call]; 784 if (len > sizeof(a)) 785 return -EINVAL; 786 787 if (copy_from_user(a, args, len)) 788 return -EFAULT; 789 790 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 791 if (ret) 792 return ret; 793 794 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_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); 824 break; 825 case SYS_SENDTO: 826 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], 827 compat_ptr(a[4]), a[5]); 828 break; 829 case SYS_RECV: 830 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 831 NULL, NULL); 832 break; 833 case SYS_RECVFROM: 834 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 835 compat_ptr(a[4]), 836 compat_ptr(a[5])); 837 break; 838 case SYS_SHUTDOWN: 839 ret = __sys_shutdown(a0, a1); 840 break; 841 case SYS_SETSOCKOPT: 842 ret = __compat_sys_setsockopt(a0, a1, a[2], 843 compat_ptr(a[3]), a[4]); 844 break; 845 case SYS_GETSOCKOPT: 846 ret = __compat_sys_getsockopt(a0, a1, a[2], 847 compat_ptr(a[3]), 848 compat_ptr(a[4])); 849 break; 850 case SYS_SENDMSG: 851 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 852 break; 853 case SYS_SENDMMSG: 854 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 855 break; 856 case SYS_RECVMSG: 857 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 858 break; 859 case SYS_RECVMMSG: 860 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2], 861 a[3] | MSG_CMSG_COMPAT, NULL, 862 compat_ptr(a[4])); 863 break; 864 case SYS_ACCEPT4: 865 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 866 break; 867 default: 868 ret = -EINVAL; 869 break; 870 } 871 return ret; 872 } 873