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 static int __compat_sys_getsockopt(int fd, int level, int optname, 399 char __user *optval, 400 int __user *optlen) 401 { 402 int err; 403 struct socket *sock = sockfd_lookup(fd, &err); 404 405 if (sock) { 406 err = security_socket_getsockopt(sock, level, optname); 407 if (err) { 408 sockfd_put(sock); 409 return err; 410 } 411 412 if (level == SOL_SOCKET) 413 err = sock_getsockopt(sock, level, 414 optname, optval, optlen); 415 else if (sock->ops->compat_getsockopt) 416 err = sock->ops->compat_getsockopt(sock, level, 417 optname, optval, optlen); 418 else 419 err = sock->ops->getsockopt(sock, level, 420 optname, optval, optlen); 421 sockfd_put(sock); 422 } 423 return err; 424 } 425 426 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 427 char __user *, optval, int __user *, optlen) 428 { 429 return __compat_sys_getsockopt(fd, level, optname, optval, optlen); 430 } 431 432 struct compat_group_req { 433 __u32 gr_interface; 434 struct __kernel_sockaddr_storage gr_group 435 __aligned(4); 436 } __packed; 437 438 struct compat_group_source_req { 439 __u32 gsr_interface; 440 struct __kernel_sockaddr_storage gsr_group 441 __aligned(4); 442 struct __kernel_sockaddr_storage gsr_source 443 __aligned(4); 444 } __packed; 445 446 struct compat_group_filter { 447 __u32 gf_interface; 448 struct __kernel_sockaddr_storage gf_group 449 __aligned(4); 450 __u32 gf_fmode; 451 __u32 gf_numsrc; 452 struct __kernel_sockaddr_storage gf_slist[1] 453 __aligned(4); 454 } __packed; 455 456 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 457 sizeof(struct __kernel_sockaddr_storage)) 458 459 460 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 461 char __user *optval, unsigned int optlen, 462 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 463 { 464 char __user *koptval = optval; 465 int koptlen = optlen; 466 467 switch (optname) { 468 case MCAST_JOIN_GROUP: 469 case MCAST_LEAVE_GROUP: 470 { 471 struct compat_group_req __user *gr32 = (void __user *)optval; 472 struct group_req __user *kgr = 473 compat_alloc_user_space(sizeof(struct group_req)); 474 u32 interface; 475 476 if (!access_ok(gr32, sizeof(*gr32)) || 477 !access_ok(kgr, sizeof(struct group_req)) || 478 __get_user(interface, &gr32->gr_interface) || 479 __put_user(interface, &kgr->gr_interface) || 480 copy_in_user(&kgr->gr_group, &gr32->gr_group, 481 sizeof(kgr->gr_group))) 482 return -EFAULT; 483 koptval = (char __user *)kgr; 484 koptlen = sizeof(struct group_req); 485 break; 486 } 487 case MCAST_JOIN_SOURCE_GROUP: 488 case MCAST_LEAVE_SOURCE_GROUP: 489 case MCAST_BLOCK_SOURCE: 490 case MCAST_UNBLOCK_SOURCE: 491 { 492 struct compat_group_source_req __user *gsr32 = (void __user *)optval; 493 struct group_source_req __user *kgsr = compat_alloc_user_space( 494 sizeof(struct group_source_req)); 495 u32 interface; 496 497 if (!access_ok(gsr32, sizeof(*gsr32)) || 498 !access_ok(kgsr, 499 sizeof(struct group_source_req)) || 500 __get_user(interface, &gsr32->gsr_interface) || 501 __put_user(interface, &kgsr->gsr_interface) || 502 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 503 sizeof(kgsr->gsr_group)) || 504 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 505 sizeof(kgsr->gsr_source))) 506 return -EFAULT; 507 koptval = (char __user *)kgsr; 508 koptlen = sizeof(struct group_source_req); 509 break; 510 } 511 case MCAST_MSFILTER: 512 { 513 struct compat_group_filter __user *gf32 = (void __user *)optval; 514 struct group_filter __user *kgf; 515 u32 interface, fmode, numsrc; 516 517 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 518 __get_user(interface, &gf32->gf_interface) || 519 __get_user(fmode, &gf32->gf_fmode) || 520 __get_user(numsrc, &gf32->gf_numsrc)) 521 return -EFAULT; 522 koptlen = optlen + sizeof(struct group_filter) - 523 sizeof(struct compat_group_filter); 524 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 525 return -EINVAL; 526 kgf = compat_alloc_user_space(koptlen); 527 if (!access_ok(kgf, koptlen) || 528 __put_user(interface, &kgf->gf_interface) || 529 __put_user(fmode, &kgf->gf_fmode) || 530 __put_user(numsrc, &kgf->gf_numsrc) || 531 copy_in_user(&kgf->gf_group, &gf32->gf_group, 532 sizeof(kgf->gf_group)) || 533 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 534 numsrc * sizeof(kgf->gf_slist[0])))) 535 return -EFAULT; 536 koptval = (char __user *)kgf; 537 break; 538 } 539 540 default: 541 break; 542 } 543 return setsockopt(sock, level, optname, koptval, koptlen); 544 } 545 EXPORT_SYMBOL(compat_mc_setsockopt); 546 547 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 548 char __user *optval, int __user *optlen, 549 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 550 { 551 struct compat_group_filter __user *gf32 = (void __user *)optval; 552 struct group_filter __user *kgf; 553 int __user *koptlen; 554 u32 interface, fmode, numsrc; 555 int klen, ulen, err; 556 557 if (optname != MCAST_MSFILTER) 558 return getsockopt(sock, level, optname, optval, optlen); 559 560 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 561 if (!access_ok(optlen, sizeof(*optlen)) || 562 __get_user(ulen, optlen)) 563 return -EFAULT; 564 565 /* adjust len for pad */ 566 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 567 568 if (klen < GROUP_FILTER_SIZE(0)) 569 return -EINVAL; 570 571 if (!access_ok(koptlen, sizeof(*koptlen)) || 572 __put_user(klen, koptlen)) 573 return -EFAULT; 574 575 /* have to allow space for previous compat_alloc_user_space, too */ 576 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 577 578 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 579 __get_user(interface, &gf32->gf_interface) || 580 __get_user(fmode, &gf32->gf_fmode) || 581 __get_user(numsrc, &gf32->gf_numsrc) || 582 __put_user(interface, &kgf->gf_interface) || 583 __put_user(fmode, &kgf->gf_fmode) || 584 __put_user(numsrc, &kgf->gf_numsrc) || 585 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 586 return -EFAULT; 587 588 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 589 if (err) 590 return err; 591 592 if (!access_ok(koptlen, sizeof(*koptlen)) || 593 __get_user(klen, koptlen)) 594 return -EFAULT; 595 596 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 597 598 if (!access_ok(optlen, sizeof(*optlen)) || 599 __put_user(ulen, optlen)) 600 return -EFAULT; 601 602 if (!access_ok(kgf, klen) || 603 !access_ok(gf32, ulen) || 604 __get_user(interface, &kgf->gf_interface) || 605 __get_user(fmode, &kgf->gf_fmode) || 606 __get_user(numsrc, &kgf->gf_numsrc) || 607 __put_user(interface, &gf32->gf_interface) || 608 __put_user(fmode, &gf32->gf_fmode) || 609 __put_user(numsrc, &gf32->gf_numsrc)) 610 return -EFAULT; 611 if (numsrc) { 612 int copylen; 613 614 klen -= GROUP_FILTER_SIZE(0); 615 copylen = numsrc * sizeof(gf32->gf_slist[0]); 616 if (copylen > klen) 617 copylen = klen; 618 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 619 return -EFAULT; 620 } 621 return err; 622 } 623 EXPORT_SYMBOL(compat_mc_getsockopt); 624 625 626 /* Argument list sizes for compat_sys_socketcall */ 627 #define AL(x) ((x) * sizeof(u32)) 628 static unsigned char nas[21] = { 629 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 630 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 631 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 632 AL(4), AL(5), AL(4) 633 }; 634 #undef AL 635 636 static inline long __compat_sys_sendmsg(int fd, 637 struct compat_msghdr __user *msg, 638 unsigned int flags) 639 { 640 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, 641 flags | MSG_CMSG_COMPAT, false); 642 } 643 644 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, 645 unsigned int, flags) 646 { 647 return __compat_sys_sendmsg(fd, msg, flags); 648 } 649 650 static inline long __compat_sys_sendmmsg(int fd, 651 struct compat_mmsghdr __user *mmsg, 652 unsigned int vlen, unsigned int flags) 653 { 654 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 655 flags | MSG_CMSG_COMPAT, false); 656 } 657 658 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 659 unsigned int, vlen, unsigned int, flags) 660 { 661 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); 662 } 663 664 static inline long __compat_sys_recvmsg(int fd, 665 struct compat_msghdr __user *msg, 666 unsigned int flags) 667 { 668 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, 669 flags | MSG_CMSG_COMPAT, false); 670 } 671 672 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, 673 unsigned int, flags) 674 { 675 return __compat_sys_recvmsg(fd, msg, flags); 676 } 677 678 static inline long __compat_sys_recvfrom(int fd, void __user *buf, 679 compat_size_t len, unsigned int flags, 680 struct sockaddr __user *addr, 681 int __user *addrlen) 682 { 683 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, 684 addrlen); 685 } 686 687 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 688 { 689 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); 690 } 691 692 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 693 unsigned int, flags, struct sockaddr __user *, addr, 694 int __user *, addrlen) 695 { 696 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); 697 } 698 699 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg, 700 unsigned int, vlen, unsigned int, flags, 701 struct __kernel_timespec __user *, timeout) 702 { 703 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 704 flags | MSG_CMSG_COMPAT, timeout, NULL); 705 } 706 707 #ifdef CONFIG_COMPAT_32BIT_TIME 708 COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg, 709 unsigned int, vlen, unsigned int, flags, 710 struct old_timespec32 __user *, timeout) 711 { 712 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 713 flags | MSG_CMSG_COMPAT, NULL, timeout); 714 } 715 #endif 716 717 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 718 { 719 u32 a[AUDITSC_ARGS]; 720 unsigned int len; 721 u32 a0, a1; 722 int ret; 723 724 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 725 return -EINVAL; 726 len = nas[call]; 727 if (len > sizeof(a)) 728 return -EINVAL; 729 730 if (copy_from_user(a, args, len)) 731 return -EFAULT; 732 733 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 734 if (ret) 735 return ret; 736 737 a0 = a[0]; 738 a1 = a[1]; 739 740 switch (call) { 741 case SYS_SOCKET: 742 ret = __sys_socket(a0, a1, a[2]); 743 break; 744 case SYS_BIND: 745 ret = __sys_bind(a0, compat_ptr(a1), a[2]); 746 break; 747 case SYS_CONNECT: 748 ret = __sys_connect(a0, compat_ptr(a1), a[2]); 749 break; 750 case SYS_LISTEN: 751 ret = __sys_listen(a0, a1); 752 break; 753 case SYS_ACCEPT: 754 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 755 break; 756 case SYS_GETSOCKNAME: 757 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 758 break; 759 case SYS_GETPEERNAME: 760 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 761 break; 762 case SYS_SOCKETPAIR: 763 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 764 break; 765 case SYS_SEND: 766 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); 767 break; 768 case SYS_SENDTO: 769 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], 770 compat_ptr(a[4]), a[5]); 771 break; 772 case SYS_RECV: 773 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 774 NULL, NULL); 775 break; 776 case SYS_RECVFROM: 777 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 778 compat_ptr(a[4]), 779 compat_ptr(a[5])); 780 break; 781 case SYS_SHUTDOWN: 782 ret = __sys_shutdown(a0, a1); 783 break; 784 case SYS_SETSOCKOPT: 785 ret = __compat_sys_setsockopt(a0, a1, a[2], 786 compat_ptr(a[3]), a[4]); 787 break; 788 case SYS_GETSOCKOPT: 789 ret = __compat_sys_getsockopt(a0, a1, a[2], 790 compat_ptr(a[3]), 791 compat_ptr(a[4])); 792 break; 793 case SYS_SENDMSG: 794 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 795 break; 796 case SYS_SENDMMSG: 797 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 798 break; 799 case SYS_RECVMSG: 800 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 801 break; 802 case SYS_RECVMMSG: 803 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2], 804 a[3] | MSG_CMSG_COMPAT, NULL, 805 compat_ptr(a[4])); 806 break; 807 case SYS_ACCEPT4: 808 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 809 break; 810 default: 811 ret = -EINVAL; 812 break; 813 } 814 return ret; 815 } 816