1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c. 4 * 5 * Copyright (C) 2000 VA Linux Co 6 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> 7 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> 8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) 10 * Copyright (C) 2000 Hewlett-Packard Co. 11 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> 12 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/gfp.h> 17 #include <linux/fs.h> 18 #include <linux/types.h> 19 #include <linux/file.h> 20 #include <linux/icmpv6.h> 21 #include <linux/socket.h> 22 #include <linux/syscalls.h> 23 #include <linux/filter.h> 24 #include <linux/compat.h> 25 #include <linux/security.h> 26 #include <linux/audit.h> 27 #include <linux/export.h> 28 29 #include <net/scm.h> 30 #include <net/sock.h> 31 #include <net/ip.h> 32 #include <net/ipv6.h> 33 #include <linux/uaccess.h> 34 #include <net/compat.h> 35 36 int __get_compat_msghdr(struct msghdr *kmsg, 37 struct compat_msghdr __user *umsg, 38 struct sockaddr __user **save_addr, 39 compat_uptr_t *ptr, compat_size_t *len) 40 { 41 struct compat_msghdr msg; 42 ssize_t err; 43 44 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 45 return -EFAULT; 46 47 kmsg->msg_flags = msg.msg_flags; 48 kmsg->msg_namelen = msg.msg_namelen; 49 50 if (!msg.msg_name) 51 kmsg->msg_namelen = 0; 52 53 if (kmsg->msg_namelen < 0) 54 return -EINVAL; 55 56 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 57 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 58 59 kmsg->msg_control = compat_ptr(msg.msg_control); 60 kmsg->msg_controllen = msg.msg_controllen; 61 62 if (save_addr) 63 *save_addr = compat_ptr(msg.msg_name); 64 65 if (msg.msg_name && kmsg->msg_namelen) { 66 if (!save_addr) { 67 err = move_addr_to_kernel(compat_ptr(msg.msg_name), 68 kmsg->msg_namelen, 69 kmsg->msg_name); 70 if (err < 0) 71 return err; 72 } 73 } else { 74 kmsg->msg_name = NULL; 75 kmsg->msg_namelen = 0; 76 } 77 78 if (msg.msg_iovlen > UIO_MAXIOV) 79 return -EMSGSIZE; 80 81 kmsg->msg_iocb = NULL; 82 *ptr = msg.msg_iov; 83 *len = msg.msg_iovlen; 84 return 0; 85 } 86 87 int get_compat_msghdr(struct msghdr *kmsg, 88 struct compat_msghdr __user *umsg, 89 struct sockaddr __user **save_addr, 90 struct iovec **iov) 91 { 92 compat_uptr_t ptr; 93 compat_size_t len; 94 ssize_t err; 95 96 err = __get_compat_msghdr(kmsg, umsg, save_addr, &ptr, &len); 97 if (err) 98 return err; 99 100 err = compat_import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), 101 len, UIO_FASTIOV, iov, &kmsg->msg_iter); 102 return err < 0 ? err : 0; 103 } 104 105 /* Bleech... */ 106 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 107 108 #define CMSG_COMPAT_DATA(cmsg) \ 109 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr))) 110 #define CMSG_COMPAT_SPACE(len) \ 111 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) 112 #define CMSG_COMPAT_LEN(len) \ 113 (sizeof(struct compat_cmsghdr) + (len)) 114 115 #define CMSG_COMPAT_FIRSTHDR(msg) \ 116 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 117 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 118 (struct compat_cmsghdr __user *)NULL) 119 120 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 121 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 122 (ucmlen) <= (unsigned long) \ 123 ((mhdr)->msg_controllen - \ 124 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 125 126 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 127 struct compat_cmsghdr __user *cmsg, int cmsg_len) 128 { 129 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 130 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 131 msg->msg_controllen) 132 return NULL; 133 return (struct compat_cmsghdr __user *)ptr; 134 } 135 136 /* There is a lot of hair here because the alignment rules (and 137 * thus placement) of cmsg headers and length are different for 138 * 32-bit apps. -DaveM 139 */ 140 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 141 unsigned char *stackbuf, int stackbuf_size) 142 { 143 struct compat_cmsghdr __user *ucmsg; 144 struct cmsghdr *kcmsg, *kcmsg_base; 145 compat_size_t ucmlen; 146 __kernel_size_t kcmlen, tmp; 147 int err = -EFAULT; 148 149 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != 150 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); 151 152 kcmlen = 0; 153 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 154 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 155 while (ucmsg != NULL) { 156 if (get_user(ucmlen, &ucmsg->cmsg_len)) 157 return -EFAULT; 158 159 /* Catch bogons. */ 160 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 161 return -EINVAL; 162 163 tmp = ((ucmlen - sizeof(*ucmsg)) + 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 - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 190 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 191 goto Einval; 192 kcmsg->cmsg_len = tmp; 193 tmp = CMSG_ALIGN(tmp); 194 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 195 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 196 copy_from_user(CMSG_DATA(kcmsg), 197 CMSG_COMPAT_DATA(ucmsg), 198 (ucmlen - sizeof(*ucmsg)))) 199 goto Efault; 200 201 /* Advance. */ 202 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 203 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 204 } 205 206 /* 207 * check the length of messages copied in is the same as the 208 * what we get from the first loop 209 */ 210 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen) 211 goto Einval; 212 213 /* Ok, looks like we made it. Hook it up and return success. */ 214 kmsg->msg_control = kcmsg_base; 215 kmsg->msg_controllen = kcmlen; 216 return 0; 217 218 Einval: 219 err = -EINVAL; 220 Efault: 221 if (kcmsg_base != (struct cmsghdr *)stackbuf) 222 sock_kfree_s(sk, kcmsg_base, kcmlen); 223 return err; 224 } 225 226 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 227 { 228 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 229 struct compat_cmsghdr cmhdr; 230 struct old_timeval32 ctv; 231 struct old_timespec32 cts[3]; 232 int cmlen; 233 234 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 235 kmsg->msg_flags |= MSG_CTRUNC; 236 return 0; /* XXX: return error? check spec. */ 237 } 238 239 if (!COMPAT_USE_64BIT_TIME) { 240 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) { 241 struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data; 242 ctv.tv_sec = tv->tv_sec; 243 ctv.tv_usec = tv->tv_usec; 244 data = &ctv; 245 len = sizeof(ctv); 246 } 247 if (level == SOL_SOCKET && 248 (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) { 249 int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3; 250 int i; 251 struct __kernel_old_timespec *ts = data; 252 for (i = 0; i < count; i++) { 253 cts[i].tv_sec = ts[i].tv_sec; 254 cts[i].tv_nsec = ts[i].tv_nsec; 255 } 256 data = &cts; 257 len = sizeof(cts[0]) * count; 258 } 259 } 260 261 cmlen = CMSG_COMPAT_LEN(len); 262 if (kmsg->msg_controllen < cmlen) { 263 kmsg->msg_flags |= MSG_CTRUNC; 264 cmlen = kmsg->msg_controllen; 265 } 266 cmhdr.cmsg_level = level; 267 cmhdr.cmsg_type = type; 268 cmhdr.cmsg_len = cmlen; 269 270 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 271 return -EFAULT; 272 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 273 return -EFAULT; 274 cmlen = CMSG_COMPAT_SPACE(len); 275 if (kmsg->msg_controllen < cmlen) 276 cmlen = kmsg->msg_controllen; 277 kmsg->msg_control += cmlen; 278 kmsg->msg_controllen -= cmlen; 279 return 0; 280 } 281 282 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 283 { 284 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 285 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 286 int fdnum = scm->fp->count; 287 struct file **fp = scm->fp->fp; 288 int __user *cmfptr; 289 int err = 0, i; 290 291 if (fdnum < fdmax) 292 fdmax = fdnum; 293 294 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 295 int new_fd; 296 err = security_file_receive(fp[i]); 297 if (err) 298 break; 299 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 300 ? O_CLOEXEC : 0); 301 if (err < 0) 302 break; 303 new_fd = err; 304 err = put_user(new_fd, cmfptr); 305 if (err) { 306 put_unused_fd(new_fd); 307 break; 308 } 309 /* Bump the usage count and install the file. */ 310 fd_install(new_fd, get_file(fp[i])); 311 } 312 313 if (i > 0) { 314 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 315 err = put_user(SOL_SOCKET, &cm->cmsg_level); 316 if (!err) 317 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 318 if (!err) 319 err = put_user(cmlen, &cm->cmsg_len); 320 if (!err) { 321 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 322 kmsg->msg_control += cmlen; 323 kmsg->msg_controllen -= cmlen; 324 } 325 } 326 if (i < fdnum) 327 kmsg->msg_flags |= MSG_CTRUNC; 328 329 /* 330 * All of the files that fit in the message have had their 331 * usage counts incremented, so we just free the list. 332 */ 333 __scm_destroy(scm); 334 } 335 336 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 337 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 338 { 339 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 340 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 341 struct compat_sock_fprog f32; 342 struct sock_fprog f; 343 344 if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) 345 return NULL; 346 memset(&f, 0, sizeof(f)); 347 f.len = f32.len; 348 f.filter = compat_ptr(f32.filter); 349 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) 350 return NULL; 351 352 return kfprog; 353 } 354 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 355 356 static int do_set_attach_filter(struct socket *sock, int level, int optname, 357 char __user *optval, unsigned int optlen) 358 { 359 struct sock_fprog __user *kfprog; 360 361 kfprog = get_compat_bpf_fprog(optval); 362 if (!kfprog) 363 return -EFAULT; 364 365 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 366 sizeof(struct sock_fprog)); 367 } 368 369 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 370 char __user *optval, unsigned int optlen) 371 { 372 if (optname == SO_ATTACH_FILTER || 373 optname == SO_ATTACH_REUSEPORT_CBPF) 374 return do_set_attach_filter(sock, level, optname, 375 optval, optlen); 376 return sock_setsockopt(sock, level, optname, optval, optlen); 377 } 378 379 static int __compat_sys_setsockopt(int fd, int level, int optname, 380 char __user *optval, unsigned int optlen) 381 { 382 int err; 383 struct socket *sock; 384 385 if (optlen > INT_MAX) 386 return -EINVAL; 387 388 sock = sockfd_lookup(fd, &err); 389 if (sock) { 390 err = security_socket_setsockopt(sock, level, optname); 391 if (err) { 392 sockfd_put(sock); 393 return err; 394 } 395 396 if (level == SOL_SOCKET) 397 err = compat_sock_setsockopt(sock, level, 398 optname, optval, optlen); 399 else if (sock->ops->compat_setsockopt) 400 err = sock->ops->compat_setsockopt(sock, level, 401 optname, optval, optlen); 402 else 403 err = sock->ops->setsockopt(sock, level, 404 optname, optval, optlen); 405 sockfd_put(sock); 406 } 407 return err; 408 } 409 410 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 411 char __user *, optval, unsigned int, optlen) 412 { 413 return __compat_sys_setsockopt(fd, level, optname, optval, optlen); 414 } 415 416 static int __compat_sys_getsockopt(int fd, int level, int optname, 417 char __user *optval, 418 int __user *optlen) 419 { 420 int err; 421 struct socket *sock = sockfd_lookup(fd, &err); 422 423 if (sock) { 424 err = security_socket_getsockopt(sock, level, optname); 425 if (err) { 426 sockfd_put(sock); 427 return err; 428 } 429 430 if (level == SOL_SOCKET) 431 err = sock_getsockopt(sock, level, 432 optname, optval, optlen); 433 else if (sock->ops->compat_getsockopt) 434 err = sock->ops->compat_getsockopt(sock, level, 435 optname, optval, optlen); 436 else 437 err = sock->ops->getsockopt(sock, level, 438 optname, optval, optlen); 439 sockfd_put(sock); 440 } 441 return err; 442 } 443 444 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 445 char __user *, optval, int __user *, optlen) 446 { 447 return __compat_sys_getsockopt(fd, level, optname, optval, optlen); 448 } 449 450 struct compat_group_req { 451 __u32 gr_interface; 452 struct __kernel_sockaddr_storage gr_group 453 __aligned(4); 454 } __packed; 455 456 struct compat_group_source_req { 457 __u32 gsr_interface; 458 struct __kernel_sockaddr_storage gsr_group 459 __aligned(4); 460 struct __kernel_sockaddr_storage gsr_source 461 __aligned(4); 462 } __packed; 463 464 struct compat_group_filter { 465 __u32 gf_interface; 466 struct __kernel_sockaddr_storage gf_group 467 __aligned(4); 468 __u32 gf_fmode; 469 __u32 gf_numsrc; 470 struct __kernel_sockaddr_storage gf_slist[1] 471 __aligned(4); 472 } __packed; 473 474 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 475 sizeof(struct __kernel_sockaddr_storage)) 476 477 478 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 479 char __user *optval, unsigned int optlen, 480 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 481 { 482 char __user *koptval = optval; 483 int koptlen = optlen; 484 485 switch (optname) { 486 case MCAST_JOIN_GROUP: 487 case MCAST_LEAVE_GROUP: 488 { 489 struct compat_group_req __user *gr32 = (void __user *)optval; 490 struct group_req __user *kgr = 491 compat_alloc_user_space(sizeof(struct group_req)); 492 u32 interface; 493 494 if (!access_ok(gr32, sizeof(*gr32)) || 495 !access_ok(kgr, sizeof(struct group_req)) || 496 __get_user(interface, &gr32->gr_interface) || 497 __put_user(interface, &kgr->gr_interface) || 498 copy_in_user(&kgr->gr_group, &gr32->gr_group, 499 sizeof(kgr->gr_group))) 500 return -EFAULT; 501 koptval = (char __user *)kgr; 502 koptlen = sizeof(struct group_req); 503 break; 504 } 505 case MCAST_JOIN_SOURCE_GROUP: 506 case MCAST_LEAVE_SOURCE_GROUP: 507 case MCAST_BLOCK_SOURCE: 508 case MCAST_UNBLOCK_SOURCE: 509 { 510 struct compat_group_source_req __user *gsr32 = (void __user *)optval; 511 struct group_source_req __user *kgsr = compat_alloc_user_space( 512 sizeof(struct group_source_req)); 513 u32 interface; 514 515 if (!access_ok(gsr32, sizeof(*gsr32)) || 516 !access_ok(kgsr, 517 sizeof(struct group_source_req)) || 518 __get_user(interface, &gsr32->gsr_interface) || 519 __put_user(interface, &kgsr->gsr_interface) || 520 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 521 sizeof(kgsr->gsr_group)) || 522 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 523 sizeof(kgsr->gsr_source))) 524 return -EFAULT; 525 koptval = (char __user *)kgsr; 526 koptlen = sizeof(struct group_source_req); 527 break; 528 } 529 case MCAST_MSFILTER: 530 { 531 struct compat_group_filter __user *gf32 = (void __user *)optval; 532 struct group_filter __user *kgf; 533 u32 interface, fmode, numsrc; 534 535 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 536 __get_user(interface, &gf32->gf_interface) || 537 __get_user(fmode, &gf32->gf_fmode) || 538 __get_user(numsrc, &gf32->gf_numsrc)) 539 return -EFAULT; 540 koptlen = optlen + sizeof(struct group_filter) - 541 sizeof(struct compat_group_filter); 542 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 543 return -EINVAL; 544 kgf = compat_alloc_user_space(koptlen); 545 if (!access_ok(kgf, koptlen) || 546 __put_user(interface, &kgf->gf_interface) || 547 __put_user(fmode, &kgf->gf_fmode) || 548 __put_user(numsrc, &kgf->gf_numsrc) || 549 copy_in_user(&kgf->gf_group, &gf32->gf_group, 550 sizeof(kgf->gf_group)) || 551 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 552 numsrc * sizeof(kgf->gf_slist[0])))) 553 return -EFAULT; 554 koptval = (char __user *)kgf; 555 break; 556 } 557 558 default: 559 break; 560 } 561 return setsockopt(sock, level, optname, koptval, koptlen); 562 } 563 EXPORT_SYMBOL(compat_mc_setsockopt); 564 565 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 566 char __user *optval, int __user *optlen, 567 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 568 { 569 struct compat_group_filter __user *gf32 = (void __user *)optval; 570 struct group_filter __user *kgf; 571 int __user *koptlen; 572 u32 interface, fmode, numsrc; 573 int klen, ulen, err; 574 575 if (optname != MCAST_MSFILTER) 576 return getsockopt(sock, level, optname, optval, optlen); 577 578 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 579 if (!access_ok(optlen, sizeof(*optlen)) || 580 __get_user(ulen, optlen)) 581 return -EFAULT; 582 583 /* adjust len for pad */ 584 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 585 586 if (klen < GROUP_FILTER_SIZE(0)) 587 return -EINVAL; 588 589 if (!access_ok(koptlen, sizeof(*koptlen)) || 590 __put_user(klen, koptlen)) 591 return -EFAULT; 592 593 /* have to allow space for previous compat_alloc_user_space, too */ 594 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 595 596 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 597 __get_user(interface, &gf32->gf_interface) || 598 __get_user(fmode, &gf32->gf_fmode) || 599 __get_user(numsrc, &gf32->gf_numsrc) || 600 __put_user(interface, &kgf->gf_interface) || 601 __put_user(fmode, &kgf->gf_fmode) || 602 __put_user(numsrc, &kgf->gf_numsrc) || 603 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 604 return -EFAULT; 605 606 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 607 if (err) 608 return err; 609 610 if (!access_ok(koptlen, sizeof(*koptlen)) || 611 __get_user(klen, koptlen)) 612 return -EFAULT; 613 614 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 615 616 if (!access_ok(optlen, sizeof(*optlen)) || 617 __put_user(ulen, optlen)) 618 return -EFAULT; 619 620 if (!access_ok(kgf, klen) || 621 !access_ok(gf32, ulen) || 622 __get_user(interface, &kgf->gf_interface) || 623 __get_user(fmode, &kgf->gf_fmode) || 624 __get_user(numsrc, &kgf->gf_numsrc) || 625 __put_user(interface, &gf32->gf_interface) || 626 __put_user(fmode, &gf32->gf_fmode) || 627 __put_user(numsrc, &gf32->gf_numsrc)) 628 return -EFAULT; 629 if (numsrc) { 630 int copylen; 631 632 klen -= GROUP_FILTER_SIZE(0); 633 copylen = numsrc * sizeof(gf32->gf_slist[0]); 634 if (copylen > klen) 635 copylen = klen; 636 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 637 return -EFAULT; 638 } 639 return err; 640 } 641 EXPORT_SYMBOL(compat_mc_getsockopt); 642 643 644 /* Argument list sizes for compat_sys_socketcall */ 645 #define AL(x) ((x) * sizeof(u32)) 646 static unsigned char nas[21] = { 647 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 648 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 649 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 650 AL(4), AL(5), AL(4) 651 }; 652 #undef AL 653 654 static inline long __compat_sys_sendmsg(int fd, 655 struct compat_msghdr __user *msg, 656 unsigned int flags) 657 { 658 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, 659 flags | MSG_CMSG_COMPAT, false); 660 } 661 662 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, 663 unsigned int, flags) 664 { 665 return __compat_sys_sendmsg(fd, msg, flags); 666 } 667 668 static inline long __compat_sys_sendmmsg(int fd, 669 struct compat_mmsghdr __user *mmsg, 670 unsigned int vlen, unsigned int flags) 671 { 672 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 673 flags | MSG_CMSG_COMPAT, false); 674 } 675 676 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 677 unsigned int, vlen, unsigned int, flags) 678 { 679 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); 680 } 681 682 static inline long __compat_sys_recvmsg(int fd, 683 struct compat_msghdr __user *msg, 684 unsigned int flags) 685 { 686 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, 687 flags | MSG_CMSG_COMPAT, false); 688 } 689 690 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, 691 unsigned int, flags) 692 { 693 return __compat_sys_recvmsg(fd, msg, flags); 694 } 695 696 static inline long __compat_sys_recvfrom(int fd, void __user *buf, 697 compat_size_t len, unsigned int flags, 698 struct sockaddr __user *addr, 699 int __user *addrlen) 700 { 701 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, 702 addrlen); 703 } 704 705 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 706 { 707 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); 708 } 709 710 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 711 unsigned int, flags, struct sockaddr __user *, addr, 712 int __user *, addrlen) 713 { 714 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); 715 } 716 717 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg, 718 unsigned int, vlen, unsigned int, flags, 719 struct __kernel_timespec __user *, timeout) 720 { 721 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 722 flags | MSG_CMSG_COMPAT, timeout, NULL); 723 } 724 725 #ifdef CONFIG_COMPAT_32BIT_TIME 726 COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg, 727 unsigned int, vlen, unsigned int, flags, 728 struct old_timespec32 __user *, timeout) 729 { 730 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 731 flags | MSG_CMSG_COMPAT, NULL, timeout); 732 } 733 #endif 734 735 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 736 { 737 u32 a[AUDITSC_ARGS]; 738 unsigned int len; 739 u32 a0, a1; 740 int ret; 741 742 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 743 return -EINVAL; 744 len = nas[call]; 745 if (len > sizeof(a)) 746 return -EINVAL; 747 748 if (copy_from_user(a, args, len)) 749 return -EFAULT; 750 751 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 752 if (ret) 753 return ret; 754 755 a0 = a[0]; 756 a1 = a[1]; 757 758 switch (call) { 759 case SYS_SOCKET: 760 ret = __sys_socket(a0, a1, a[2]); 761 break; 762 case SYS_BIND: 763 ret = __sys_bind(a0, compat_ptr(a1), a[2]); 764 break; 765 case SYS_CONNECT: 766 ret = __sys_connect(a0, compat_ptr(a1), a[2]); 767 break; 768 case SYS_LISTEN: 769 ret = __sys_listen(a0, a1); 770 break; 771 case SYS_ACCEPT: 772 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 773 break; 774 case SYS_GETSOCKNAME: 775 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 776 break; 777 case SYS_GETPEERNAME: 778 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 779 break; 780 case SYS_SOCKETPAIR: 781 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 782 break; 783 case SYS_SEND: 784 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); 785 break; 786 case SYS_SENDTO: 787 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], 788 compat_ptr(a[4]), a[5]); 789 break; 790 case SYS_RECV: 791 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 792 NULL, NULL); 793 break; 794 case SYS_RECVFROM: 795 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 796 compat_ptr(a[4]), 797 compat_ptr(a[5])); 798 break; 799 case SYS_SHUTDOWN: 800 ret = __sys_shutdown(a0, a1); 801 break; 802 case SYS_SETSOCKOPT: 803 ret = __compat_sys_setsockopt(a0, a1, a[2], 804 compat_ptr(a[3]), a[4]); 805 break; 806 case SYS_GETSOCKOPT: 807 ret = __compat_sys_getsockopt(a0, a1, a[2], 808 compat_ptr(a[3]), 809 compat_ptr(a[4])); 810 break; 811 case SYS_SENDMSG: 812 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 813 break; 814 case SYS_SENDMMSG: 815 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 816 break; 817 case SYS_RECVMSG: 818 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 819 break; 820 case SYS_RECVMMSG: 821 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2], 822 a[3] | MSG_CMSG_COMPAT, NULL, 823 compat_ptr(a[4])); 824 break; 825 case SYS_ACCEPT4: 826 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 827 break; 828 default: 829 ret = -EINVAL; 830 break; 831 } 832 return ret; 833 } 834