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