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 struct iovec **iov) 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 83 err = compat_import_iovec(save_addr ? READ : WRITE, 84 compat_ptr(msg.msg_iov), msg.msg_iovlen, 85 UIO_FASTIOV, iov, &kmsg->msg_iter); 86 return err < 0 ? err : 0; 87 } 88 89 /* Bleech... */ 90 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 91 92 #define CMSG_COMPAT_DATA(cmsg) \ 93 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr))) 94 #define CMSG_COMPAT_SPACE(len) \ 95 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) 96 #define CMSG_COMPAT_LEN(len) \ 97 (sizeof(struct compat_cmsghdr) + (len)) 98 99 #define CMSG_COMPAT_FIRSTHDR(msg) \ 100 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 101 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 102 (struct compat_cmsghdr __user *)NULL) 103 104 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 105 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 106 (ucmlen) <= (unsigned long) \ 107 ((mhdr)->msg_controllen - \ 108 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 109 110 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 111 struct compat_cmsghdr __user *cmsg, int cmsg_len) 112 { 113 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 114 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 115 msg->msg_controllen) 116 return NULL; 117 return (struct compat_cmsghdr __user *)ptr; 118 } 119 120 /* There is a lot of hair here because the alignment rules (and 121 * thus placement) of cmsg headers and length are different for 122 * 32-bit apps. -DaveM 123 */ 124 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 125 unsigned char *stackbuf, int stackbuf_size) 126 { 127 struct compat_cmsghdr __user *ucmsg; 128 struct cmsghdr *kcmsg, *kcmsg_base; 129 compat_size_t ucmlen; 130 __kernel_size_t kcmlen, tmp; 131 int err = -EFAULT; 132 133 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != 134 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); 135 136 kcmlen = 0; 137 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 138 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 139 while (ucmsg != NULL) { 140 if (get_user(ucmlen, &ucmsg->cmsg_len)) 141 return -EFAULT; 142 143 /* Catch bogons. */ 144 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 145 return -EINVAL; 146 147 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 148 tmp = CMSG_ALIGN(tmp); 149 kcmlen += tmp; 150 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 151 } 152 if (kcmlen == 0) 153 return -EINVAL; 154 155 /* The kcmlen holds the 64-bit version of the control length. 156 * It may not be modified as we do not stick it into the kmsg 157 * until we have successfully copied over all of the data 158 * from the user. 159 */ 160 if (kcmlen > stackbuf_size) 161 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 162 if (kcmsg == NULL) 163 return -ENOBUFS; 164 165 /* Now copy them over neatly. */ 166 memset(kcmsg, 0, kcmlen); 167 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 168 while (ucmsg != NULL) { 169 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 170 goto Efault; 171 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 172 goto Einval; 173 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 174 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 175 goto Einval; 176 kcmsg->cmsg_len = tmp; 177 tmp = CMSG_ALIGN(tmp); 178 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 179 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 180 copy_from_user(CMSG_DATA(kcmsg), 181 CMSG_COMPAT_DATA(ucmsg), 182 (ucmlen - sizeof(*ucmsg)))) 183 goto Efault; 184 185 /* Advance. */ 186 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 187 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 188 } 189 190 /* 191 * check the length of messages copied in is the same as the 192 * what we get from the first loop 193 */ 194 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen) 195 goto Einval; 196 197 /* Ok, looks like we made it. Hook it up and return success. */ 198 kmsg->msg_control = kcmsg_base; 199 kmsg->msg_controllen = kcmlen; 200 return 0; 201 202 Einval: 203 err = -EINVAL; 204 Efault: 205 if (kcmsg_base != (struct cmsghdr *)stackbuf) 206 sock_kfree_s(sk, kcmsg_base, kcmlen); 207 return err; 208 } 209 210 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 211 { 212 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 213 struct compat_cmsghdr cmhdr; 214 struct old_timeval32 ctv; 215 struct old_timespec32 cts[3]; 216 int cmlen; 217 218 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 219 kmsg->msg_flags |= MSG_CTRUNC; 220 return 0; /* XXX: return error? check spec. */ 221 } 222 223 if (!COMPAT_USE_64BIT_TIME) { 224 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) { 225 struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data; 226 ctv.tv_sec = tv->tv_sec; 227 ctv.tv_usec = tv->tv_usec; 228 data = &ctv; 229 len = sizeof(ctv); 230 } 231 if (level == SOL_SOCKET && 232 (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) { 233 int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3; 234 int i; 235 struct timespec *ts = (struct timespec *)data; 236 for (i = 0; i < count; i++) { 237 cts[i].tv_sec = ts[i].tv_sec; 238 cts[i].tv_nsec = ts[i].tv_nsec; 239 } 240 data = &cts; 241 len = sizeof(cts[0]) * count; 242 } 243 } 244 245 cmlen = CMSG_COMPAT_LEN(len); 246 if (kmsg->msg_controllen < cmlen) { 247 kmsg->msg_flags |= MSG_CTRUNC; 248 cmlen = kmsg->msg_controllen; 249 } 250 cmhdr.cmsg_level = level; 251 cmhdr.cmsg_type = type; 252 cmhdr.cmsg_len = cmlen; 253 254 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 255 return -EFAULT; 256 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 257 return -EFAULT; 258 cmlen = CMSG_COMPAT_SPACE(len); 259 if (kmsg->msg_controllen < cmlen) 260 cmlen = kmsg->msg_controllen; 261 kmsg->msg_control += cmlen; 262 kmsg->msg_controllen -= cmlen; 263 return 0; 264 } 265 266 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 267 { 268 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 269 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 270 int fdnum = scm->fp->count; 271 struct file **fp = scm->fp->fp; 272 int __user *cmfptr; 273 int err = 0, i; 274 275 if (fdnum < fdmax) 276 fdmax = fdnum; 277 278 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 279 int new_fd; 280 err = security_file_receive(fp[i]); 281 if (err) 282 break; 283 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 284 ? O_CLOEXEC : 0); 285 if (err < 0) 286 break; 287 new_fd = err; 288 err = put_user(new_fd, cmfptr); 289 if (err) { 290 put_unused_fd(new_fd); 291 break; 292 } 293 /* Bump the usage count and install the file. */ 294 fd_install(new_fd, get_file(fp[i])); 295 } 296 297 if (i > 0) { 298 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 299 err = put_user(SOL_SOCKET, &cm->cmsg_level); 300 if (!err) 301 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 302 if (!err) 303 err = put_user(cmlen, &cm->cmsg_len); 304 if (!err) { 305 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 306 kmsg->msg_control += cmlen; 307 kmsg->msg_controllen -= cmlen; 308 } 309 } 310 if (i < fdnum) 311 kmsg->msg_flags |= MSG_CTRUNC; 312 313 /* 314 * All of the files that fit in the message have had their 315 * usage counts incremented, so we just free the list. 316 */ 317 __scm_destroy(scm); 318 } 319 320 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 321 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 322 { 323 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 324 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 325 struct compat_sock_fprog f32; 326 struct sock_fprog f; 327 328 if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) 329 return NULL; 330 memset(&f, 0, sizeof(f)); 331 f.len = f32.len; 332 f.filter = compat_ptr(f32.filter); 333 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) 334 return NULL; 335 336 return kfprog; 337 } 338 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 339 340 static int do_set_attach_filter(struct socket *sock, int level, int optname, 341 char __user *optval, unsigned int optlen) 342 { 343 struct sock_fprog __user *kfprog; 344 345 kfprog = get_compat_bpf_fprog(optval); 346 if (!kfprog) 347 return -EFAULT; 348 349 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 350 sizeof(struct sock_fprog)); 351 } 352 353 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 354 char __user *optval, unsigned int optlen) 355 { 356 if (optname == SO_ATTACH_FILTER || 357 optname == SO_ATTACH_REUSEPORT_CBPF) 358 return do_set_attach_filter(sock, level, optname, 359 optval, optlen); 360 return sock_setsockopt(sock, level, optname, optval, optlen); 361 } 362 363 static int __compat_sys_setsockopt(int fd, int level, int optname, 364 char __user *optval, unsigned int optlen) 365 { 366 int err; 367 struct socket *sock; 368 369 if (optlen > INT_MAX) 370 return -EINVAL; 371 372 sock = sockfd_lookup(fd, &err); 373 if (sock) { 374 err = security_socket_setsockopt(sock, level, optname); 375 if (err) { 376 sockfd_put(sock); 377 return err; 378 } 379 380 if (level == SOL_SOCKET) 381 err = compat_sock_setsockopt(sock, level, 382 optname, optval, optlen); 383 else if (sock->ops->compat_setsockopt) 384 err = sock->ops->compat_setsockopt(sock, level, 385 optname, optval, optlen); 386 else 387 err = sock->ops->setsockopt(sock, level, 388 optname, optval, optlen); 389 sockfd_put(sock); 390 } 391 return err; 392 } 393 394 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 395 char __user *, optval, unsigned int, optlen) 396 { 397 return __compat_sys_setsockopt(fd, level, optname, optval, optlen); 398 } 399 400 static int __compat_sys_getsockopt(int fd, int level, int optname, 401 char __user *optval, 402 int __user *optlen) 403 { 404 int err; 405 struct socket *sock = sockfd_lookup(fd, &err); 406 407 if (sock) { 408 err = security_socket_getsockopt(sock, level, optname); 409 if (err) { 410 sockfd_put(sock); 411 return err; 412 } 413 414 if (level == SOL_SOCKET) 415 err = sock_getsockopt(sock, level, 416 optname, optval, optlen); 417 else if (sock->ops->compat_getsockopt) 418 err = sock->ops->compat_getsockopt(sock, level, 419 optname, optval, optlen); 420 else 421 err = sock->ops->getsockopt(sock, level, 422 optname, optval, optlen); 423 sockfd_put(sock); 424 } 425 return err; 426 } 427 428 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 429 char __user *, optval, int __user *, optlen) 430 { 431 return __compat_sys_getsockopt(fd, level, optname, optval, optlen); 432 } 433 434 struct compat_group_req { 435 __u32 gr_interface; 436 struct __kernel_sockaddr_storage gr_group 437 __aligned(4); 438 } __packed; 439 440 struct compat_group_source_req { 441 __u32 gsr_interface; 442 struct __kernel_sockaddr_storage gsr_group 443 __aligned(4); 444 struct __kernel_sockaddr_storage gsr_source 445 __aligned(4); 446 } __packed; 447 448 struct compat_group_filter { 449 __u32 gf_interface; 450 struct __kernel_sockaddr_storage gf_group 451 __aligned(4); 452 __u32 gf_fmode; 453 __u32 gf_numsrc; 454 struct __kernel_sockaddr_storage gf_slist[1] 455 __aligned(4); 456 } __packed; 457 458 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 459 sizeof(struct __kernel_sockaddr_storage)) 460 461 462 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 463 char __user *optval, unsigned int optlen, 464 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 465 { 466 char __user *koptval = optval; 467 int koptlen = optlen; 468 469 switch (optname) { 470 case MCAST_JOIN_GROUP: 471 case MCAST_LEAVE_GROUP: 472 { 473 struct compat_group_req __user *gr32 = (void __user *)optval; 474 struct group_req __user *kgr = 475 compat_alloc_user_space(sizeof(struct group_req)); 476 u32 interface; 477 478 if (!access_ok(gr32, sizeof(*gr32)) || 479 !access_ok(kgr, sizeof(struct group_req)) || 480 __get_user(interface, &gr32->gr_interface) || 481 __put_user(interface, &kgr->gr_interface) || 482 copy_in_user(&kgr->gr_group, &gr32->gr_group, 483 sizeof(kgr->gr_group))) 484 return -EFAULT; 485 koptval = (char __user *)kgr; 486 koptlen = sizeof(struct group_req); 487 break; 488 } 489 case MCAST_JOIN_SOURCE_GROUP: 490 case MCAST_LEAVE_SOURCE_GROUP: 491 case MCAST_BLOCK_SOURCE: 492 case MCAST_UNBLOCK_SOURCE: 493 { 494 struct compat_group_source_req __user *gsr32 = (void __user *)optval; 495 struct group_source_req __user *kgsr = compat_alloc_user_space( 496 sizeof(struct group_source_req)); 497 u32 interface; 498 499 if (!access_ok(gsr32, sizeof(*gsr32)) || 500 !access_ok(kgsr, 501 sizeof(struct group_source_req)) || 502 __get_user(interface, &gsr32->gsr_interface) || 503 __put_user(interface, &kgsr->gsr_interface) || 504 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 505 sizeof(kgsr->gsr_group)) || 506 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 507 sizeof(kgsr->gsr_source))) 508 return -EFAULT; 509 koptval = (char __user *)kgsr; 510 koptlen = sizeof(struct group_source_req); 511 break; 512 } 513 case MCAST_MSFILTER: 514 { 515 struct compat_group_filter __user *gf32 = (void __user *)optval; 516 struct group_filter __user *kgf; 517 u32 interface, fmode, numsrc; 518 519 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 520 __get_user(interface, &gf32->gf_interface) || 521 __get_user(fmode, &gf32->gf_fmode) || 522 __get_user(numsrc, &gf32->gf_numsrc)) 523 return -EFAULT; 524 koptlen = optlen + sizeof(struct group_filter) - 525 sizeof(struct compat_group_filter); 526 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 527 return -EINVAL; 528 kgf = compat_alloc_user_space(koptlen); 529 if (!access_ok(kgf, koptlen) || 530 __put_user(interface, &kgf->gf_interface) || 531 __put_user(fmode, &kgf->gf_fmode) || 532 __put_user(numsrc, &kgf->gf_numsrc) || 533 copy_in_user(&kgf->gf_group, &gf32->gf_group, 534 sizeof(kgf->gf_group)) || 535 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 536 numsrc * sizeof(kgf->gf_slist[0])))) 537 return -EFAULT; 538 koptval = (char __user *)kgf; 539 break; 540 } 541 542 default: 543 break; 544 } 545 return setsockopt(sock, level, optname, koptval, koptlen); 546 } 547 EXPORT_SYMBOL(compat_mc_setsockopt); 548 549 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 550 char __user *optval, int __user *optlen, 551 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 552 { 553 struct compat_group_filter __user *gf32 = (void __user *)optval; 554 struct group_filter __user *kgf; 555 int __user *koptlen; 556 u32 interface, fmode, numsrc; 557 int klen, ulen, err; 558 559 if (optname != MCAST_MSFILTER) 560 return getsockopt(sock, level, optname, optval, optlen); 561 562 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 563 if (!access_ok(optlen, sizeof(*optlen)) || 564 __get_user(ulen, optlen)) 565 return -EFAULT; 566 567 /* adjust len for pad */ 568 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 569 570 if (klen < GROUP_FILTER_SIZE(0)) 571 return -EINVAL; 572 573 if (!access_ok(koptlen, sizeof(*koptlen)) || 574 __put_user(klen, koptlen)) 575 return -EFAULT; 576 577 /* have to allow space for previous compat_alloc_user_space, too */ 578 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 579 580 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 581 __get_user(interface, &gf32->gf_interface) || 582 __get_user(fmode, &gf32->gf_fmode) || 583 __get_user(numsrc, &gf32->gf_numsrc) || 584 __put_user(interface, &kgf->gf_interface) || 585 __put_user(fmode, &kgf->gf_fmode) || 586 __put_user(numsrc, &kgf->gf_numsrc) || 587 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 588 return -EFAULT; 589 590 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 591 if (err) 592 return err; 593 594 if (!access_ok(koptlen, sizeof(*koptlen)) || 595 __get_user(klen, koptlen)) 596 return -EFAULT; 597 598 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 599 600 if (!access_ok(optlen, sizeof(*optlen)) || 601 __put_user(ulen, optlen)) 602 return -EFAULT; 603 604 if (!access_ok(kgf, klen) || 605 !access_ok(gf32, ulen) || 606 __get_user(interface, &kgf->gf_interface) || 607 __get_user(fmode, &kgf->gf_fmode) || 608 __get_user(numsrc, &kgf->gf_numsrc) || 609 __put_user(interface, &gf32->gf_interface) || 610 __put_user(fmode, &gf32->gf_fmode) || 611 __put_user(numsrc, &gf32->gf_numsrc)) 612 return -EFAULT; 613 if (numsrc) { 614 int copylen; 615 616 klen -= GROUP_FILTER_SIZE(0); 617 copylen = numsrc * sizeof(gf32->gf_slist[0]); 618 if (copylen > klen) 619 copylen = klen; 620 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 621 return -EFAULT; 622 } 623 return err; 624 } 625 EXPORT_SYMBOL(compat_mc_getsockopt); 626 627 628 /* Argument list sizes for compat_sys_socketcall */ 629 #define AL(x) ((x) * sizeof(u32)) 630 static unsigned char nas[21] = { 631 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 632 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 633 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 634 AL(4), AL(5), AL(4) 635 }; 636 #undef AL 637 638 static inline long __compat_sys_sendmsg(int fd, 639 struct compat_msghdr __user *msg, 640 unsigned int flags) 641 { 642 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, 643 flags | MSG_CMSG_COMPAT, false); 644 } 645 646 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, 647 unsigned int, flags) 648 { 649 return __compat_sys_sendmsg(fd, msg, flags); 650 } 651 652 static inline long __compat_sys_sendmmsg(int fd, 653 struct compat_mmsghdr __user *mmsg, 654 unsigned int vlen, unsigned int flags) 655 { 656 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 657 flags | MSG_CMSG_COMPAT, false); 658 } 659 660 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 661 unsigned int, vlen, unsigned int, flags) 662 { 663 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); 664 } 665 666 static inline long __compat_sys_recvmsg(int fd, 667 struct compat_msghdr __user *msg, 668 unsigned int flags) 669 { 670 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, 671 flags | MSG_CMSG_COMPAT, false); 672 } 673 674 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, 675 unsigned int, flags) 676 { 677 return __compat_sys_recvmsg(fd, msg, flags); 678 } 679 680 static inline long __compat_sys_recvfrom(int fd, void __user *buf, 681 compat_size_t len, unsigned int flags, 682 struct sockaddr __user *addr, 683 int __user *addrlen) 684 { 685 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, 686 addrlen); 687 } 688 689 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 690 { 691 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); 692 } 693 694 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 695 unsigned int, flags, struct sockaddr __user *, addr, 696 int __user *, addrlen) 697 { 698 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); 699 } 700 701 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg, 702 unsigned int, vlen, unsigned int, flags, 703 struct __kernel_timespec __user *, timeout) 704 { 705 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 706 flags | MSG_CMSG_COMPAT, timeout, NULL); 707 } 708 709 #ifdef CONFIG_COMPAT_32BIT_TIME 710 COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg, 711 unsigned int, vlen, unsigned int, flags, 712 struct old_timespec32 __user *, timeout) 713 { 714 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 715 flags | MSG_CMSG_COMPAT, NULL, timeout); 716 } 717 #endif 718 719 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 720 { 721 u32 a[AUDITSC_ARGS]; 722 unsigned int len; 723 u32 a0, a1; 724 int ret; 725 726 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 727 return -EINVAL; 728 len = nas[call]; 729 if (len > sizeof(a)) 730 return -EINVAL; 731 732 if (copy_from_user(a, args, len)) 733 return -EFAULT; 734 735 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 736 if (ret) 737 return ret; 738 739 a0 = a[0]; 740 a1 = a[1]; 741 742 switch (call) { 743 case SYS_SOCKET: 744 ret = __sys_socket(a0, a1, a[2]); 745 break; 746 case SYS_BIND: 747 ret = __sys_bind(a0, compat_ptr(a1), a[2]); 748 break; 749 case SYS_CONNECT: 750 ret = __sys_connect(a0, compat_ptr(a1), a[2]); 751 break; 752 case SYS_LISTEN: 753 ret = __sys_listen(a0, a1); 754 break; 755 case SYS_ACCEPT: 756 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 757 break; 758 case SYS_GETSOCKNAME: 759 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 760 break; 761 case SYS_GETPEERNAME: 762 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 763 break; 764 case SYS_SOCKETPAIR: 765 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 766 break; 767 case SYS_SEND: 768 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); 769 break; 770 case SYS_SENDTO: 771 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], 772 compat_ptr(a[4]), a[5]); 773 break; 774 case SYS_RECV: 775 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 776 NULL, NULL); 777 break; 778 case SYS_RECVFROM: 779 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 780 compat_ptr(a[4]), 781 compat_ptr(a[5])); 782 break; 783 case SYS_SHUTDOWN: 784 ret = __sys_shutdown(a0, a1); 785 break; 786 case SYS_SETSOCKOPT: 787 ret = __compat_sys_setsockopt(a0, a1, a[2], 788 compat_ptr(a[3]), a[4]); 789 break; 790 case SYS_GETSOCKOPT: 791 ret = __compat_sys_getsockopt(a0, a1, a[2], 792 compat_ptr(a[3]), 793 compat_ptr(a[4])); 794 break; 795 case SYS_SENDMSG: 796 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 797 break; 798 case SYS_SENDMMSG: 799 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 800 break; 801 case SYS_RECVMSG: 802 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 803 break; 804 case SYS_RECVMMSG: 805 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2], 806 a[3] | MSG_CMSG_COMPAT, NULL, 807 compat_ptr(a[4])); 808 break; 809 case SYS_ACCEPT4: 810 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 811 break; 812 default: 813 ret = -EINVAL; 814 break; 815 } 816 return ret; 817 } 818