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_is_user = true; 60 kmsg->msg_control_user = compat_ptr(msg.msg_control); 61 kmsg->msg_controllen = msg.msg_controllen; 62 63 if (save_addr) 64 *save_addr = compat_ptr(msg.msg_name); 65 66 if (msg.msg_name && kmsg->msg_namelen) { 67 if (!save_addr) { 68 err = move_addr_to_kernel(compat_ptr(msg.msg_name), 69 kmsg->msg_namelen, 70 kmsg->msg_name); 71 if (err < 0) 72 return err; 73 } 74 } else { 75 kmsg->msg_name = NULL; 76 kmsg->msg_namelen = 0; 77 } 78 79 if (msg.msg_iovlen > UIO_MAXIOV) 80 return -EMSGSIZE; 81 82 kmsg->msg_iocb = NULL; 83 *ptr = msg.msg_iov; 84 *len = msg.msg_iovlen; 85 return 0; 86 } 87 88 int get_compat_msghdr(struct msghdr *kmsg, 89 struct compat_msghdr __user *umsg, 90 struct sockaddr __user **save_addr, 91 struct iovec **iov) 92 { 93 compat_uptr_t ptr; 94 compat_size_t len; 95 ssize_t err; 96 97 err = __get_compat_msghdr(kmsg, umsg, save_addr, &ptr, &len); 98 if (err) 99 return err; 100 101 err = compat_import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), 102 len, UIO_FASTIOV, iov, &kmsg->msg_iter); 103 return err < 0 ? err : 0; 104 } 105 106 /* Bleech... */ 107 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 108 109 #define CMSG_COMPAT_DATA(cmsg) \ 110 ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr))) 111 #define CMSG_COMPAT_SPACE(len) \ 112 (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) 113 #define CMSG_COMPAT_LEN(len) \ 114 (sizeof(struct compat_cmsghdr) + (len)) 115 116 #define CMSG_COMPAT_FIRSTHDR(msg) \ 117 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 118 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 119 (struct compat_cmsghdr __user *)NULL) 120 121 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 122 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 123 (ucmlen) <= (unsigned long) \ 124 ((mhdr)->msg_controllen - \ 125 ((char __user *)(ucmsg) - (char __user *)(mhdr)->msg_control_user))) 126 127 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 128 struct compat_cmsghdr __user *cmsg, int cmsg_len) 129 { 130 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 131 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 132 msg->msg_controllen) 133 return NULL; 134 return (struct compat_cmsghdr __user *)ptr; 135 } 136 137 /* There is a lot of hair here because the alignment rules (and 138 * thus placement) of cmsg headers and length are different for 139 * 32-bit apps. -DaveM 140 */ 141 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 142 unsigned char *stackbuf, int stackbuf_size) 143 { 144 struct compat_cmsghdr __user *ucmsg; 145 struct cmsghdr *kcmsg, *kcmsg_base; 146 compat_size_t ucmlen; 147 __kernel_size_t kcmlen, tmp; 148 int err = -EFAULT; 149 150 BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != 151 CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); 152 153 kcmlen = 0; 154 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 155 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 156 while (ucmsg != NULL) { 157 if (get_user(ucmlen, &ucmsg->cmsg_len)) 158 return -EFAULT; 159 160 /* Catch bogons. */ 161 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 162 return -EINVAL; 163 164 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 165 tmp = CMSG_ALIGN(tmp); 166 kcmlen += tmp; 167 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 168 } 169 if (kcmlen == 0) 170 return -EINVAL; 171 172 /* The kcmlen holds the 64-bit version of the control length. 173 * It may not be modified as we do not stick it into the kmsg 174 * until we have successfully copied over all of the data 175 * from the user. 176 */ 177 if (kcmlen > stackbuf_size) 178 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 179 if (kcmsg == NULL) 180 return -ENOBUFS; 181 182 /* Now copy them over neatly. */ 183 memset(kcmsg, 0, kcmlen); 184 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 185 while (ucmsg != NULL) { 186 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 187 goto Efault; 188 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 189 goto Einval; 190 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); 191 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 192 goto Einval; 193 kcmsg->cmsg_len = tmp; 194 tmp = CMSG_ALIGN(tmp); 195 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 196 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 197 copy_from_user(CMSG_DATA(kcmsg), 198 CMSG_COMPAT_DATA(ucmsg), 199 (ucmlen - sizeof(*ucmsg)))) 200 goto Efault; 201 202 /* Advance. */ 203 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 204 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 205 } 206 207 /* 208 * check the length of messages copied in is the same as the 209 * what we get from the first loop 210 */ 211 if ((char *)kcmsg - (char *)kcmsg_base != kcmlen) 212 goto Einval; 213 214 /* Ok, looks like we made it. Hook it up and return success. */ 215 kmsg->msg_control = kcmsg_base; 216 kmsg->msg_controllen = kcmlen; 217 return 0; 218 219 Einval: 220 err = -EINVAL; 221 Efault: 222 if (kcmsg_base != (struct cmsghdr *)stackbuf) 223 sock_kfree_s(sk, kcmsg_base, kcmlen); 224 return err; 225 } 226 227 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 228 { 229 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 230 struct compat_cmsghdr cmhdr; 231 struct old_timeval32 ctv; 232 struct old_timespec32 cts[3]; 233 int cmlen; 234 235 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 236 kmsg->msg_flags |= MSG_CTRUNC; 237 return 0; /* XXX: return error? check spec. */ 238 } 239 240 if (!COMPAT_USE_64BIT_TIME) { 241 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) { 242 struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data; 243 ctv.tv_sec = tv->tv_sec; 244 ctv.tv_usec = tv->tv_usec; 245 data = &ctv; 246 len = sizeof(ctv); 247 } 248 if (level == SOL_SOCKET && 249 (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) { 250 int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3; 251 int i; 252 struct __kernel_old_timespec *ts = data; 253 for (i = 0; i < count; i++) { 254 cts[i].tv_sec = ts[i].tv_sec; 255 cts[i].tv_nsec = ts[i].tv_nsec; 256 } 257 data = &cts; 258 len = sizeof(cts[0]) * count; 259 } 260 } 261 262 cmlen = CMSG_COMPAT_LEN(len); 263 if (kmsg->msg_controllen < cmlen) { 264 kmsg->msg_flags |= MSG_CTRUNC; 265 cmlen = kmsg->msg_controllen; 266 } 267 cmhdr.cmsg_level = level; 268 cmhdr.cmsg_type = type; 269 cmhdr.cmsg_len = cmlen; 270 271 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 272 return -EFAULT; 273 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 274 return -EFAULT; 275 cmlen = CMSG_COMPAT_SPACE(len); 276 if (kmsg->msg_controllen < cmlen) 277 cmlen = kmsg->msg_controllen; 278 kmsg->msg_control += cmlen; 279 kmsg->msg_controllen -= cmlen; 280 return 0; 281 } 282 283 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 284 { 285 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 286 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 287 int fdnum = scm->fp->count; 288 struct file **fp = scm->fp->fp; 289 int __user *cmfptr; 290 int err = 0, i; 291 292 if (fdnum < fdmax) 293 fdmax = fdnum; 294 295 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 296 int new_fd; 297 err = security_file_receive(fp[i]); 298 if (err) 299 break; 300 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 301 ? O_CLOEXEC : 0); 302 if (err < 0) 303 break; 304 new_fd = err; 305 err = put_user(new_fd, cmfptr); 306 if (err) { 307 put_unused_fd(new_fd); 308 break; 309 } 310 /* Bump the usage count and install the file. */ 311 fd_install(new_fd, get_file(fp[i])); 312 } 313 314 if (i > 0) { 315 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 316 err = put_user(SOL_SOCKET, &cm->cmsg_level); 317 if (!err) 318 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 319 if (!err) 320 err = put_user(cmlen, &cm->cmsg_len); 321 if (!err) { 322 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 323 kmsg->msg_control += cmlen; 324 kmsg->msg_controllen -= cmlen; 325 } 326 } 327 if (i < fdnum) 328 kmsg->msg_flags |= MSG_CTRUNC; 329 330 /* 331 * All of the files that fit in the message have had their 332 * usage counts incremented, so we just free the list. 333 */ 334 __scm_destroy(scm); 335 } 336 337 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ 338 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) 339 { 340 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 341 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 342 struct compat_sock_fprog f32; 343 struct sock_fprog f; 344 345 if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) 346 return NULL; 347 memset(&f, 0, sizeof(f)); 348 f.len = f32.len; 349 f.filter = compat_ptr(f32.filter); 350 if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) 351 return NULL; 352 353 return kfprog; 354 } 355 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); 356 357 static int do_set_attach_filter(struct socket *sock, int level, int optname, 358 char __user *optval, unsigned int optlen) 359 { 360 struct sock_fprog __user *kfprog; 361 362 kfprog = get_compat_bpf_fprog(optval); 363 if (!kfprog) 364 return -EFAULT; 365 366 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 367 sizeof(struct sock_fprog)); 368 } 369 370 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 371 char __user *optval, unsigned int optlen) 372 { 373 if (optname == SO_ATTACH_FILTER || 374 optname == SO_ATTACH_REUSEPORT_CBPF) 375 return do_set_attach_filter(sock, level, optname, 376 optval, optlen); 377 return sock_setsockopt(sock, level, optname, optval, optlen); 378 } 379 380 static int __compat_sys_setsockopt(int fd, int level, int optname, 381 char __user *optval, unsigned int optlen) 382 { 383 int err; 384 struct socket *sock; 385 386 if (optlen > INT_MAX) 387 return -EINVAL; 388 389 sock = sockfd_lookup(fd, &err); 390 if (sock) { 391 err = security_socket_setsockopt(sock, level, optname); 392 if (err) { 393 sockfd_put(sock); 394 return err; 395 } 396 397 if (level == SOL_SOCKET) 398 err = compat_sock_setsockopt(sock, level, 399 optname, optval, optlen); 400 else if (sock->ops->compat_setsockopt) 401 err = sock->ops->compat_setsockopt(sock, level, 402 optname, optval, optlen); 403 else 404 err = sock->ops->setsockopt(sock, level, 405 optname, optval, optlen); 406 sockfd_put(sock); 407 } 408 return err; 409 } 410 411 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 412 char __user *, optval, unsigned int, optlen) 413 { 414 return __compat_sys_setsockopt(fd, level, optname, optval, optlen); 415 } 416 417 static int __compat_sys_getsockopt(int fd, int level, int optname, 418 char __user *optval, 419 int __user *optlen) 420 { 421 int err; 422 struct socket *sock = sockfd_lookup(fd, &err); 423 424 if (sock) { 425 err = security_socket_getsockopt(sock, level, optname); 426 if (err) { 427 sockfd_put(sock); 428 return err; 429 } 430 431 if (level == SOL_SOCKET) 432 err = sock_getsockopt(sock, level, 433 optname, optval, optlen); 434 else if (sock->ops->compat_getsockopt) 435 err = sock->ops->compat_getsockopt(sock, level, 436 optname, optval, optlen); 437 else 438 err = sock->ops->getsockopt(sock, level, 439 optname, optval, optlen); 440 sockfd_put(sock); 441 } 442 return err; 443 } 444 445 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 446 char __user *, optval, int __user *, optlen) 447 { 448 return __compat_sys_getsockopt(fd, level, optname, optval, optlen); 449 } 450 451 struct compat_group_req { 452 __u32 gr_interface; 453 struct __kernel_sockaddr_storage gr_group 454 __aligned(4); 455 } __packed; 456 457 struct compat_group_source_req { 458 __u32 gsr_interface; 459 struct __kernel_sockaddr_storage gsr_group 460 __aligned(4); 461 struct __kernel_sockaddr_storage gsr_source 462 __aligned(4); 463 } __packed; 464 465 struct compat_group_filter { 466 __u32 gf_interface; 467 struct __kernel_sockaddr_storage gf_group 468 __aligned(4); 469 __u32 gf_fmode; 470 __u32 gf_numsrc; 471 struct __kernel_sockaddr_storage gf_slist[1] 472 __aligned(4); 473 } __packed; 474 475 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 476 sizeof(struct __kernel_sockaddr_storage)) 477 478 479 int compat_mc_setsockopt(struct sock *sock, int level, int optname, 480 char __user *optval, unsigned int optlen, 481 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 482 { 483 char __user *koptval = optval; 484 int koptlen = optlen; 485 486 switch (optname) { 487 case MCAST_JOIN_GROUP: 488 case MCAST_LEAVE_GROUP: 489 { 490 struct compat_group_req __user *gr32 = (void __user *)optval; 491 struct group_req __user *kgr = 492 compat_alloc_user_space(sizeof(struct group_req)); 493 u32 interface; 494 495 if (!access_ok(gr32, sizeof(*gr32)) || 496 !access_ok(kgr, sizeof(struct group_req)) || 497 __get_user(interface, &gr32->gr_interface) || 498 __put_user(interface, &kgr->gr_interface) || 499 copy_in_user(&kgr->gr_group, &gr32->gr_group, 500 sizeof(kgr->gr_group))) 501 return -EFAULT; 502 koptval = (char __user *)kgr; 503 koptlen = sizeof(struct group_req); 504 break; 505 } 506 case MCAST_JOIN_SOURCE_GROUP: 507 case MCAST_LEAVE_SOURCE_GROUP: 508 case MCAST_BLOCK_SOURCE: 509 case MCAST_UNBLOCK_SOURCE: 510 { 511 struct compat_group_source_req __user *gsr32 = (void __user *)optval; 512 struct group_source_req __user *kgsr = compat_alloc_user_space( 513 sizeof(struct group_source_req)); 514 u32 interface; 515 516 if (!access_ok(gsr32, sizeof(*gsr32)) || 517 !access_ok(kgsr, 518 sizeof(struct group_source_req)) || 519 __get_user(interface, &gsr32->gsr_interface) || 520 __put_user(interface, &kgsr->gsr_interface) || 521 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 522 sizeof(kgsr->gsr_group)) || 523 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 524 sizeof(kgsr->gsr_source))) 525 return -EFAULT; 526 koptval = (char __user *)kgsr; 527 koptlen = sizeof(struct group_source_req); 528 break; 529 } 530 case MCAST_MSFILTER: 531 { 532 struct compat_group_filter __user *gf32 = (void __user *)optval; 533 struct group_filter __user *kgf; 534 u32 interface, fmode, numsrc; 535 536 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 537 __get_user(interface, &gf32->gf_interface) || 538 __get_user(fmode, &gf32->gf_fmode) || 539 __get_user(numsrc, &gf32->gf_numsrc)) 540 return -EFAULT; 541 koptlen = optlen + sizeof(struct group_filter) - 542 sizeof(struct compat_group_filter); 543 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 544 return -EINVAL; 545 kgf = compat_alloc_user_space(koptlen); 546 if (!access_ok(kgf, koptlen) || 547 __put_user(interface, &kgf->gf_interface) || 548 __put_user(fmode, &kgf->gf_fmode) || 549 __put_user(numsrc, &kgf->gf_numsrc) || 550 copy_in_user(&kgf->gf_group, &gf32->gf_group, 551 sizeof(kgf->gf_group)) || 552 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 553 numsrc * sizeof(kgf->gf_slist[0])))) 554 return -EFAULT; 555 koptval = (char __user *)kgf; 556 break; 557 } 558 559 default: 560 break; 561 } 562 return setsockopt(sock, level, optname, koptval, koptlen); 563 } 564 EXPORT_SYMBOL(compat_mc_setsockopt); 565 566 int compat_mc_getsockopt(struct sock *sock, int level, int optname, 567 char __user *optval, int __user *optlen, 568 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 569 { 570 struct compat_group_filter __user *gf32 = (void __user *)optval; 571 struct group_filter __user *kgf; 572 int __user *koptlen; 573 u32 interface, fmode, numsrc; 574 int klen, ulen, err; 575 576 if (optname != MCAST_MSFILTER) 577 return getsockopt(sock, level, optname, optval, optlen); 578 579 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 580 if (!access_ok(optlen, sizeof(*optlen)) || 581 __get_user(ulen, optlen)) 582 return -EFAULT; 583 584 /* adjust len for pad */ 585 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 586 587 if (klen < GROUP_FILTER_SIZE(0)) 588 return -EINVAL; 589 590 if (!access_ok(koptlen, sizeof(*koptlen)) || 591 __put_user(klen, koptlen)) 592 return -EFAULT; 593 594 /* have to allow space for previous compat_alloc_user_space, too */ 595 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 596 597 if (!access_ok(gf32, __COMPAT_GF0_SIZE) || 598 __get_user(interface, &gf32->gf_interface) || 599 __get_user(fmode, &gf32->gf_fmode) || 600 __get_user(numsrc, &gf32->gf_numsrc) || 601 __put_user(interface, &kgf->gf_interface) || 602 __put_user(fmode, &kgf->gf_fmode) || 603 __put_user(numsrc, &kgf->gf_numsrc) || 604 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 605 return -EFAULT; 606 607 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 608 if (err) 609 return err; 610 611 if (!access_ok(koptlen, sizeof(*koptlen)) || 612 __get_user(klen, koptlen)) 613 return -EFAULT; 614 615 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 616 617 if (!access_ok(optlen, sizeof(*optlen)) || 618 __put_user(ulen, optlen)) 619 return -EFAULT; 620 621 if (!access_ok(kgf, klen) || 622 !access_ok(gf32, ulen) || 623 __get_user(interface, &kgf->gf_interface) || 624 __get_user(fmode, &kgf->gf_fmode) || 625 __get_user(numsrc, &kgf->gf_numsrc) || 626 __put_user(interface, &gf32->gf_interface) || 627 __put_user(fmode, &gf32->gf_fmode) || 628 __put_user(numsrc, &gf32->gf_numsrc)) 629 return -EFAULT; 630 if (numsrc) { 631 int copylen; 632 633 klen -= GROUP_FILTER_SIZE(0); 634 copylen = numsrc * sizeof(gf32->gf_slist[0]); 635 if (copylen > klen) 636 copylen = klen; 637 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 638 return -EFAULT; 639 } 640 return err; 641 } 642 EXPORT_SYMBOL(compat_mc_getsockopt); 643 644 645 /* Argument list sizes for compat_sys_socketcall */ 646 #define AL(x) ((x) * sizeof(u32)) 647 static unsigned char nas[21] = { 648 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 649 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 650 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 651 AL(4), AL(5), AL(4) 652 }; 653 #undef AL 654 655 static inline long __compat_sys_sendmsg(int fd, 656 struct compat_msghdr __user *msg, 657 unsigned int flags) 658 { 659 return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, 660 flags | MSG_CMSG_COMPAT, false); 661 } 662 663 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, 664 unsigned int, flags) 665 { 666 return __compat_sys_sendmsg(fd, msg, flags); 667 } 668 669 static inline long __compat_sys_sendmmsg(int fd, 670 struct compat_mmsghdr __user *mmsg, 671 unsigned int vlen, unsigned int flags) 672 { 673 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 674 flags | MSG_CMSG_COMPAT, false); 675 } 676 677 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, 678 unsigned int, vlen, unsigned int, flags) 679 { 680 return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); 681 } 682 683 static inline long __compat_sys_recvmsg(int fd, 684 struct compat_msghdr __user *msg, 685 unsigned int flags) 686 { 687 return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, 688 flags | MSG_CMSG_COMPAT, false); 689 } 690 691 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, 692 unsigned int, flags) 693 { 694 return __compat_sys_recvmsg(fd, msg, flags); 695 } 696 697 static inline long __compat_sys_recvfrom(int fd, void __user *buf, 698 compat_size_t len, unsigned int flags, 699 struct sockaddr __user *addr, 700 int __user *addrlen) 701 { 702 return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, 703 addrlen); 704 } 705 706 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) 707 { 708 return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); 709 } 710 711 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, 712 unsigned int, flags, struct sockaddr __user *, addr, 713 int __user *, addrlen) 714 { 715 return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); 716 } 717 718 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg, 719 unsigned int, vlen, unsigned int, flags, 720 struct __kernel_timespec __user *, timeout) 721 { 722 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 723 flags | MSG_CMSG_COMPAT, timeout, NULL); 724 } 725 726 #ifdef CONFIG_COMPAT_32BIT_TIME 727 COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg, 728 unsigned int, vlen, unsigned int, flags, 729 struct old_timespec32 __user *, timeout) 730 { 731 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 732 flags | MSG_CMSG_COMPAT, NULL, timeout); 733 } 734 #endif 735 736 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) 737 { 738 u32 a[AUDITSC_ARGS]; 739 unsigned int len; 740 u32 a0, a1; 741 int ret; 742 743 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 744 return -EINVAL; 745 len = nas[call]; 746 if (len > sizeof(a)) 747 return -EINVAL; 748 749 if (copy_from_user(a, args, len)) 750 return -EFAULT; 751 752 ret = audit_socketcall_compat(len / sizeof(a[0]), a); 753 if (ret) 754 return ret; 755 756 a0 = a[0]; 757 a1 = a[1]; 758 759 switch (call) { 760 case SYS_SOCKET: 761 ret = __sys_socket(a0, a1, a[2]); 762 break; 763 case SYS_BIND: 764 ret = __sys_bind(a0, compat_ptr(a1), a[2]); 765 break; 766 case SYS_CONNECT: 767 ret = __sys_connect(a0, compat_ptr(a1), a[2]); 768 break; 769 case SYS_LISTEN: 770 ret = __sys_listen(a0, a1); 771 break; 772 case SYS_ACCEPT: 773 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 774 break; 775 case SYS_GETSOCKNAME: 776 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 777 break; 778 case SYS_GETPEERNAME: 779 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 780 break; 781 case SYS_SOCKETPAIR: 782 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 783 break; 784 case SYS_SEND: 785 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); 786 break; 787 case SYS_SENDTO: 788 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], 789 compat_ptr(a[4]), a[5]); 790 break; 791 case SYS_RECV: 792 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 793 NULL, NULL); 794 break; 795 case SYS_RECVFROM: 796 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 797 compat_ptr(a[4]), 798 compat_ptr(a[5])); 799 break; 800 case SYS_SHUTDOWN: 801 ret = __sys_shutdown(a0, a1); 802 break; 803 case SYS_SETSOCKOPT: 804 ret = __compat_sys_setsockopt(a0, a1, a[2], 805 compat_ptr(a[3]), a[4]); 806 break; 807 case SYS_GETSOCKOPT: 808 ret = __compat_sys_getsockopt(a0, a1, a[2], 809 compat_ptr(a[3]), 810 compat_ptr(a[4])); 811 break; 812 case SYS_SENDMSG: 813 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 814 break; 815 case SYS_SENDMMSG: 816 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 817 break; 818 case SYS_RECVMSG: 819 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 820 break; 821 case SYS_RECVMMSG: 822 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2], 823 a[3] | MSG_CMSG_COMPAT, NULL, 824 compat_ptr(a[4])); 825 break; 826 case SYS_ACCEPT4: 827 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 828 break; 829 default: 830 ret = -EINVAL; 831 break; 832 } 833 return ret; 834 } 835