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 = sockfd_lookup(fd, &err); 366 367 if (sock) { 368 err = security_socket_setsockopt(sock, level, optname); 369 if (err) { 370 sockfd_put(sock); 371 return err; 372 } 373 374 if (level == SOL_SOCKET) 375 err = compat_sock_setsockopt(sock, level, 376 optname, optval, optlen); 377 else if (sock->ops->compat_setsockopt) 378 err = sock->ops->compat_setsockopt(sock, level, 379 optname, optval, optlen); 380 else 381 err = sock->ops->setsockopt(sock, level, 382 optname, optval, optlen); 383 sockfd_put(sock); 384 } 385 return err; 386 } 387 388 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 389 char __user *, optval, unsigned int, optlen) 390 { 391 return __compat_sys_setsockopt(fd, level, optname, optval, optlen); 392 } 393 394 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 395 { 396 struct compat_timeval __user *ctv; 397 int err; 398 struct timeval tv; 399 400 if (COMPAT_USE_64BIT_TIME) 401 return sock_get_timestamp(sk, userstamp); 402 403 ctv = (struct compat_timeval __user *) userstamp; 404 err = -ENOENT; 405 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 406 tv = ktime_to_timeval(sock_read_timestamp(sk)); 407 408 if (tv.tv_sec == -1) 409 return err; 410 if (tv.tv_sec == 0) { 411 ktime_t kt = ktime_get_real(); 412 sock_write_timestamp(sk, kt); 413 tv = ktime_to_timeval(kt); 414 } 415 err = 0; 416 if (put_user(tv.tv_sec, &ctv->tv_sec) || 417 put_user(tv.tv_usec, &ctv->tv_usec)) 418 err = -EFAULT; 419 return err; 420 } 421 EXPORT_SYMBOL(compat_sock_get_timestamp); 422 423 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 424 { 425 struct compat_timespec __user *ctv; 426 int err; 427 struct timespec ts; 428 429 if (COMPAT_USE_64BIT_TIME) 430 return sock_get_timestampns (sk, userstamp); 431 432 ctv = (struct compat_timespec __user *) userstamp; 433 err = -ENOENT; 434 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 435 ts = ktime_to_timespec(sock_read_timestamp(sk)); 436 if (ts.tv_sec == -1) 437 return err; 438 if (ts.tv_sec == 0) { 439 ktime_t kt = ktime_get_real(); 440 sock_write_timestamp(sk, kt); 441 ts = ktime_to_timespec(kt); 442 } 443 err = 0; 444 if (put_user(ts.tv_sec, &ctv->tv_sec) || 445 put_user(ts.tv_nsec, &ctv->tv_nsec)) 446 err = -EFAULT; 447 return err; 448 } 449 EXPORT_SYMBOL(compat_sock_get_timestampns); 450 451 static int __compat_sys_getsockopt(int fd, int level, int optname, 452 char __user *optval, 453 int __user *optlen) 454 { 455 int err; 456 struct socket *sock = sockfd_lookup(fd, &err); 457 458 if (sock) { 459 err = security_socket_getsockopt(sock, level, optname); 460 if (err) { 461 sockfd_put(sock); 462 return err; 463 } 464 465 if (level == SOL_SOCKET) 466 err = sock_getsockopt(sock, level, 467 optname, optval, optlen); 468 else if (sock->ops->compat_getsockopt) 469 err = sock->ops->compat_getsockopt(sock, level, 470 optname, optval, optlen); 471 else 472 err = sock->ops->getsockopt(sock, level, 473 optname, optval, optlen); 474 sockfd_put(sock); 475 } 476 return err; 477 } 478 479 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 480 char __user *, optval, int __user *, optlen) 481 { 482 return __compat_sys_getsockopt(fd, level, optname, optval, optlen); 483 } 484 485 struct compat_group_req { 486 __u32 gr_interface; 487 struct __kernel_sockaddr_storage gr_group 488 __aligned(4); 489 } __packed; 490 491 struct compat_group_source_req { 492 __u32 gsr_interface; 493 struct __kernel_sockaddr_storage gsr_group 494 __aligned(4); 495 struct __kernel_sockaddr_storage gsr_source 496 __aligned(4); 497 } __packed; 498 499 struct compat_group_filter { 500 __u32 gf_interface; 501 struct __kernel_sockaddr_storage gf_group 502 __aligned(4); 503 __u32 gf_fmode; 504 __u32 gf_numsrc; 505 struct __kernel_sockaddr_storage gf_slist[1] 506 __aligned(4); 507 } __packed; 508 509 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 510 sizeof(struct __kernel_sockaddr_storage)) 511 512 513 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 514 char __user *optval, unsigned int optlen, 515 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 516 { 517 char __user *koptval = optval; 518 int koptlen = optlen; 519 520 switch (optname) { 521 case MCAST_JOIN_GROUP: 522 case MCAST_LEAVE_GROUP: 523 { 524 struct compat_group_req __user *gr32 = (void *)optval; 525 struct group_req __user *kgr = 526 compat_alloc_user_space(sizeof(struct group_req)); 527 u32 interface; 528 529 if (!access_ok(gr32, sizeof(*gr32)) || 530 !access_ok(kgr, sizeof(struct group_req)) || 531 __get_user(interface, &gr32->gr_interface) || 532 __put_user(interface, &kgr->gr_interface) || 533 copy_in_user(&kgr->gr_group, &gr32->gr_group, 534 sizeof(kgr->gr_group))) 535 return -EFAULT; 536 koptval = (char __user *)kgr; 537 koptlen = sizeof(struct group_req); 538 break; 539 } 540 case MCAST_JOIN_SOURCE_GROUP: 541 case MCAST_LEAVE_SOURCE_GROUP: 542 case MCAST_BLOCK_SOURCE: 543 case MCAST_UNBLOCK_SOURCE: 544 { 545 struct compat_group_source_req __user *gsr32 = (void *)optval; 546 struct group_source_req __user *kgsr = compat_alloc_user_space( 547 sizeof(struct group_source_req)); 548 u32 interface; 549 550 if (!access_ok(gsr32, sizeof(*gsr32)) || 551 !access_ok(kgsr, 552 sizeof(struct group_source_req)) || 553 __get_user(interface, &gsr32->gsr_interface) || 554 __put_user(interface, &kgsr->gsr_interface) || 555 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 556 sizeof(kgsr->gsr_group)) || 557 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 558 sizeof(kgsr->gsr_source))) 559 return -EFAULT; 560 koptval = (char __user *)kgsr; 561 koptlen = sizeof(struct group_source_req); 562 break; 563 } 564 case MCAST_MSFILTER: 565 { 566 struct compat_group_filter __user *gf32 = (void *)optval; 567 struct group_filter __user *kgf; 568 u32 interface, fmode, numsrc; 569 570 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 571 __get_user(interface, &gf32->gf_interface) || 572 __get_user(fmode, &gf32->gf_fmode) || 573 __get_user(numsrc, &gf32->gf_numsrc)) 574 return -EFAULT; 575 koptlen = optlen + sizeof(struct group_filter) - 576 sizeof(struct compat_group_filter); 577 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 578 return -EINVAL; 579 kgf = compat_alloc_user_space(koptlen); 580 if (!access_ok(kgf, koptlen) || 581 __put_user(interface, &kgf->gf_interface) || 582 __put_user(fmode, &kgf->gf_fmode) || 583 __put_user(numsrc, &kgf->gf_numsrc) || 584 copy_in_user(&kgf->gf_group, &gf32->gf_group, 585 sizeof(kgf->gf_group)) || 586 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 587 numsrc * sizeof(kgf->gf_slist[0])))) 588 return -EFAULT; 589 koptval = (char __user *)kgf; 590 break; 591 } 592 593 default: 594 break; 595 } 596 return setsockopt(sock, level, optname, koptval, koptlen); 597 } 598 EXPORT_SYMBOL(compat_mc_setsockopt); 599 600 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 601 char __user *optval, int __user *optlen, 602 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 603 { 604 struct compat_group_filter __user *gf32 = (void *)optval; 605 struct group_filter __user *kgf; 606 int __user *koptlen; 607 u32 interface, fmode, numsrc; 608 int klen, ulen, err; 609 610 if (optname != MCAST_MSFILTER) 611 return getsockopt(sock, level, optname, optval, optlen); 612 613 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 614 if (!access_ok(optlen, sizeof(*optlen)) || 615 __get_user(ulen, optlen)) 616 return -EFAULT; 617 618 /* adjust len for pad */ 619 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 620 621 if (klen < GROUP_FILTER_SIZE(0)) 622 return -EINVAL; 623 624 if (!access_ok(koptlen, sizeof(*koptlen)) || 625 __put_user(klen, koptlen)) 626 return -EFAULT; 627 628 /* have to allow space for previous compat_alloc_user_space, too */ 629 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 630 631 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 632 __get_user(interface, &gf32->gf_interface) || 633 __get_user(fmode, &gf32->gf_fmode) || 634 __get_user(numsrc, &gf32->gf_numsrc) || 635 __put_user(interface, &kgf->gf_interface) || 636 __put_user(fmode, &kgf->gf_fmode) || 637 __put_user(numsrc, &kgf->gf_numsrc) || 638 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 639 return -EFAULT; 640 641 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 642 if (err) 643 return err; 644 645 if (!access_ok(koptlen, sizeof(*koptlen)) || 646 __get_user(klen, koptlen)) 647 return -EFAULT; 648 649 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 650 651 if (!access_ok(optlen, sizeof(*optlen)) || 652 __put_user(ulen, optlen)) 653 return -EFAULT; 654 655 if (!access_ok(kgf, klen) || 656 !access_ok(gf32, ulen) || 657 __get_user(interface, &kgf->gf_interface) || 658 __get_user(fmode, &kgf->gf_fmode) || 659 __get_user(numsrc, &kgf->gf_numsrc) || 660 __put_user(interface, &gf32->gf_interface) || 661 __put_user(fmode, &gf32->gf_fmode) || 662 __put_user(numsrc, &gf32->gf_numsrc)) 663 return -EFAULT; 664 if (numsrc) { 665 int copylen; 666 667 klen -= GROUP_FILTER_SIZE(0); 668 copylen = numsrc * sizeof(gf32->gf_slist[0]); 669 if (copylen > klen) 670 copylen = klen; 671 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 672 return -EFAULT; 673 } 674 return err; 675 } 676 EXPORT_SYMBOL(compat_mc_getsockopt); 677 678 679 /* Argument list sizes for compat_sys_socketcall */ 680 #define AL(x) ((x) * sizeof(u32)) 681 static unsigned char nas[21] = { 682 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 683 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 684 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 685 AL(4), AL(5), AL(4) 686 }; 687 #undef AL 688 689 static inline long __compat_sys_sendmsg(int fd, 690 struct compat_msghdr __user *msg, 691 unsigned int flags) 692 { 693 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, 694 flags | MSG_CMSG_COMPAT, false); 695 } 696 697 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, 698 unsigned int, flags) 699 { 700 return __compat_sys_sendmsg(fd, msg, flags); 701 } 702 703 static inline long __compat_sys_sendmmsg(int fd, 704 struct compat_mmsghdr __user *mmsg, 705 unsigned int vlen, unsigned int flags) 706 { 707 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 708 flags | MSG_CMSG_COMPAT, false); 709 } 710 711 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 712 unsigned int, vlen, unsigned int, flags) 713 { 714 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); 715 } 716 717 static inline long __compat_sys_recvmsg(int fd, 718 struct compat_msghdr __user *msg, 719 unsigned int flags) 720 { 721 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, 722 flags | MSG_CMSG_COMPAT, false); 723 } 724 725 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, 726 unsigned int, flags) 727 { 728 return __compat_sys_recvmsg(fd, msg, flags); 729 } 730 731 static inline long __compat_sys_recvfrom(int fd, void __user *buf, 732 compat_size_t len, unsigned int flags, 733 struct sockaddr __user *addr, 734 int __user *addrlen) 735 { 736 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, 737 addrlen); 738 } 739 740 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 741 { 742 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); 743 } 744 745 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 746 unsigned int, flags, struct sockaddr __user *, addr, 747 int __user *, addrlen) 748 { 749 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); 750 } 751 752 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg, 753 unsigned int, vlen, unsigned int, flags, 754 struct __kernel_timespec __user *, timeout) 755 { 756 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 757 flags | MSG_CMSG_COMPAT, timeout, NULL); 758 } 759 760 #ifdef CONFIG_COMPAT_32BIT_TIME 761 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 762 unsigned int, vlen, unsigned int, flags, 763 struct old_timespec32 __user *, timeout) 764 { 765 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 766 flags | MSG_CMSG_COMPAT, NULL, timeout); 767 } 768 #endif 769 770 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 771 { 772 u32 a[AUDITSC_ARGS]; 773 unsigned int len; 774 u32 a0, a1; 775 int ret; 776 777 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 778 return -EINVAL; 779 len = nas[call]; 780 if (len > sizeof(a)) 781 return -EINVAL; 782 783 if (copy_from_user(a, args, len)) 784 return -EFAULT; 785 786 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 787 if (ret) 788 return ret; 789 790 a0 = a[0]; 791 a1 = a[1]; 792 793 switch (call) { 794 case SYS_SOCKET: 795 ret = __sys_socket(a0, a1, a[2]); 796 break; 797 case SYS_BIND: 798 ret = __sys_bind(a0, compat_ptr(a1), a[2]); 799 break; 800 case SYS_CONNECT: 801 ret = __sys_connect(a0, compat_ptr(a1), a[2]); 802 break; 803 case SYS_LISTEN: 804 ret = __sys_listen(a0, a1); 805 break; 806 case SYS_ACCEPT: 807 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 808 break; 809 case SYS_GETSOCKNAME: 810 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 811 break; 812 case SYS_GETPEERNAME: 813 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 814 break; 815 case SYS_SOCKETPAIR: 816 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 817 break; 818 case SYS_SEND: 819 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); 820 break; 821 case SYS_SENDTO: 822 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], 823 compat_ptr(a[4]), a[5]); 824 break; 825 case SYS_RECV: 826 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 827 NULL, NULL); 828 break; 829 case SYS_RECVFROM: 830 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 831 compat_ptr(a[4]), 832 compat_ptr(a[5])); 833 break; 834 case SYS_SHUTDOWN: 835 ret = __sys_shutdown(a0, a1); 836 break; 837 case SYS_SETSOCKOPT: 838 ret = __compat_sys_setsockopt(a0, a1, a[2], 839 compat_ptr(a[3]), a[4]); 840 break; 841 case SYS_GETSOCKOPT: 842 ret = __compat_sys_getsockopt(a0, a1, a[2], 843 compat_ptr(a[3]), 844 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 = __sys_recvmmsg(a0, compat_ptr(a1), a[2], 857 a[3] | MSG_CMSG_COMPAT, NULL, 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