compat.c revision 2def2ef2ae5f3990aabdbe8a755911902707d268
1/* 2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c. 3 * 4 * Copyright (C) 2000 VA Linux Co 5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> 6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> 7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) 9 * Copyright (C) 2000 Hewlett-Packard Co. 10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> 11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs 12 */ 13 14#include <linux/kernel.h> 15#include <linux/gfp.h> 16#include <linux/fs.h> 17#include <linux/types.h> 18#include <linux/file.h> 19#include <linux/icmpv6.h> 20#include <linux/socket.h> 21#include <linux/syscalls.h> 22#include <linux/filter.h> 23#include <linux/compat.h> 24#include <linux/security.h> 25#include <linux/export.h> 26 27#include <net/scm.h> 28#include <net/sock.h> 29#include <net/ip.h> 30#include <net/ipv6.h> 31#include <asm/uaccess.h> 32#include <net/compat.h> 33 34static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 35 struct compat_iovec __user *uiov32, 36 int niov) 37{ 38 int tot_len = 0; 39 40 while (niov > 0) { 41 compat_uptr_t buf; 42 compat_size_t len; 43 44 if (get_user(len, &uiov32->iov_len) || 45 get_user(buf, &uiov32->iov_base)) 46 return -EFAULT; 47 48 if (len > INT_MAX - tot_len) 49 len = INT_MAX - tot_len; 50 51 tot_len += len; 52 kiov->iov_base = compat_ptr(buf); 53 kiov->iov_len = (__kernel_size_t) len; 54 uiov32++; 55 kiov++; 56 niov--; 57 } 58 return tot_len; 59} 60 61int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 62{ 63 compat_uptr_t tmp1, tmp2, tmp3; 64 65 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 66 __get_user(tmp1, &umsg->msg_name) || 67 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 68 __get_user(tmp2, &umsg->msg_iov) || 69 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 70 __get_user(tmp3, &umsg->msg_control) || 71 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 72 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 73 return -EFAULT; 74 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 75 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 76 kmsg->msg_name = compat_ptr(tmp1); 77 kmsg->msg_iov = compat_ptr(tmp2); 78 kmsg->msg_control = compat_ptr(tmp3); 79 return 0; 80} 81 82/* I've named the args so it is easy to tell whose space the pointers are in. */ 83int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 84 struct sockaddr_storage *kern_address, int mode) 85{ 86 int tot_len; 87 88 if (kern_msg->msg_namelen) { 89 if (mode == VERIFY_READ) { 90 int err = move_addr_to_kernel(kern_msg->msg_name, 91 kern_msg->msg_namelen, 92 kern_address); 93 if (err < 0) 94 return err; 95 } 96 if (kern_msg->msg_name) 97 kern_msg->msg_name = kern_address; 98 } else 99 kern_msg->msg_name = NULL; 100 101 tot_len = iov_from_user_compat_to_kern(kern_iov, 102 (struct compat_iovec __user *)kern_msg->msg_iov, 103 kern_msg->msg_iovlen); 104 if (tot_len >= 0) 105 kern_msg->msg_iov = kern_iov; 106 107 return tot_len; 108} 109 110/* Bleech... */ 111#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 112 113#define CMSG_COMPAT_DATA(cmsg) \ 114 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 115#define CMSG_COMPAT_SPACE(len) \ 116 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 117#define CMSG_COMPAT_LEN(len) \ 118 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 119 120#define CMSG_COMPAT_FIRSTHDR(msg) \ 121 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 122 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 123 (struct compat_cmsghdr __user *)NULL) 124 125#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 126 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 127 (ucmlen) <= (unsigned long) \ 128 ((mhdr)->msg_controllen - \ 129 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 130 131static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 132 struct compat_cmsghdr __user *cmsg, int cmsg_len) 133{ 134 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 135 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 136 msg->msg_controllen) 137 return NULL; 138 return (struct compat_cmsghdr __user *)ptr; 139} 140 141/* There is a lot of hair here because the alignment rules (and 142 * thus placement) of cmsg headers and length are different for 143 * 32-bit apps. -DaveM 144 */ 145int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 146 unsigned char *stackbuf, int stackbuf_size) 147{ 148 struct compat_cmsghdr __user *ucmsg; 149 struct cmsghdr *kcmsg, *kcmsg_base; 150 compat_size_t ucmlen; 151 __kernel_size_t kcmlen, tmp; 152 int err = -EFAULT; 153 154 kcmlen = 0; 155 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 156 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 157 while (ucmsg != NULL) { 158 if (get_user(ucmlen, &ucmsg->cmsg_len)) 159 return -EFAULT; 160 161 /* Catch bogons. */ 162 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 163 return -EINVAL; 164 165 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 166 CMSG_ALIGN(sizeof(struct cmsghdr))); 167 tmp = CMSG_ALIGN(tmp); 168 kcmlen += tmp; 169 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 170 } 171 if (kcmlen == 0) 172 return -EINVAL; 173 174 /* The kcmlen holds the 64-bit version of the control length. 175 * It may not be modified as we do not stick it into the kmsg 176 * until we have successfully copied over all of the data 177 * from the user. 178 */ 179 if (kcmlen > stackbuf_size) 180 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 181 if (kcmsg == NULL) 182 return -ENOBUFS; 183 184 /* Now copy them over neatly. */ 185 memset(kcmsg, 0, kcmlen); 186 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 187 while (ucmsg != NULL) { 188 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 189 goto Efault; 190 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 191 goto Einval; 192 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 193 CMSG_ALIGN(sizeof(struct cmsghdr))); 194 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 195 goto Einval; 196 kcmsg->cmsg_len = tmp; 197 tmp = CMSG_ALIGN(tmp); 198 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 199 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 200 copy_from_user(CMSG_DATA(kcmsg), 201 CMSG_COMPAT_DATA(ucmsg), 202 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 203 goto Efault; 204 205 /* Advance. */ 206 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 207 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 208 } 209 210 /* Ok, looks like we made it. Hook it up and return success. */ 211 kmsg->msg_control = kcmsg_base; 212 kmsg->msg_controllen = kcmlen; 213 return 0; 214 215Einval: 216 err = -EINVAL; 217Efault: 218 if (kcmsg_base != (struct cmsghdr *)stackbuf) 219 sock_kfree_s(sk, kcmsg_base, kcmlen); 220 return err; 221} 222 223int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 224{ 225 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 226 struct compat_cmsghdr cmhdr; 227 struct compat_timeval ctv; 228 struct compat_timespec cts[3]; 229 int cmlen; 230 231 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 232 kmsg->msg_flags |= MSG_CTRUNC; 233 return 0; /* XXX: return error? check spec. */ 234 } 235 236 if (!COMPAT_USE_64BIT_TIME) { 237 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 238 struct timeval *tv = (struct timeval *)data; 239 ctv.tv_sec = tv->tv_sec; 240 ctv.tv_usec = tv->tv_usec; 241 data = &ctv; 242 len = sizeof(ctv); 243 } 244 if (level == SOL_SOCKET && 245 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 246 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 247 int i; 248 struct timespec *ts = (struct timespec *)data; 249 for (i = 0; i < count; i++) { 250 cts[i].tv_sec = ts[i].tv_sec; 251 cts[i].tv_nsec = ts[i].tv_nsec; 252 } 253 data = &cts; 254 len = sizeof(cts[0]) * count; 255 } 256 } 257 258 cmlen = CMSG_COMPAT_LEN(len); 259 if (kmsg->msg_controllen < cmlen) { 260 kmsg->msg_flags |= MSG_CTRUNC; 261 cmlen = kmsg->msg_controllen; 262 } 263 cmhdr.cmsg_level = level; 264 cmhdr.cmsg_type = type; 265 cmhdr.cmsg_len = cmlen; 266 267 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 268 return -EFAULT; 269 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 270 return -EFAULT; 271 cmlen = CMSG_COMPAT_SPACE(len); 272 if (kmsg->msg_controllen < cmlen) 273 cmlen = kmsg->msg_controllen; 274 kmsg->msg_control += cmlen; 275 kmsg->msg_controllen -= cmlen; 276 return 0; 277} 278 279void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 280{ 281 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 282 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 283 int fdnum = scm->fp->count; 284 struct file **fp = scm->fp->fp; 285 int __user *cmfptr; 286 int err = 0, i; 287 288 if (fdnum < fdmax) 289 fdmax = fdnum; 290 291 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 292 int new_fd; 293 err = security_file_receive(fp[i]); 294 if (err) 295 break; 296 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 297 ? O_CLOEXEC : 0); 298 if (err < 0) 299 break; 300 new_fd = err; 301 err = put_user(new_fd, cmfptr); 302 if (err) { 303 put_unused_fd(new_fd); 304 break; 305 } 306 /* Bump the usage count and install the file. */ 307 fd_install(new_fd, get_file(fp[i])); 308 } 309 310 if (i > 0) { 311 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 312 err = put_user(SOL_SOCKET, &cm->cmsg_level); 313 if (!err) 314 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 315 if (!err) 316 err = put_user(cmlen, &cm->cmsg_len); 317 if (!err) { 318 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 319 kmsg->msg_control += cmlen; 320 kmsg->msg_controllen -= cmlen; 321 } 322 } 323 if (i < fdnum) 324 kmsg->msg_flags |= MSG_CTRUNC; 325 326 /* 327 * All of the files that fit in the message have had their 328 * usage counts incremented, so we just free the list. 329 */ 330 __scm_destroy(scm); 331} 332 333static int do_set_attach_filter(struct socket *sock, int level, int optname, 334 char __user *optval, unsigned int optlen) 335{ 336 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 337 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 338 compat_uptr_t ptr; 339 u16 len; 340 341 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 342 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 343 __get_user(len, &fprog32->len) || 344 __get_user(ptr, &fprog32->filter) || 345 __put_user(len, &kfprog->len) || 346 __put_user(compat_ptr(ptr), &kfprog->filter)) 347 return -EFAULT; 348 349 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 350 sizeof(struct sock_fprog)); 351} 352 353static int do_set_sock_timeout(struct socket *sock, int level, 354 int optname, char __user *optval, unsigned int optlen) 355{ 356 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 357 struct timeval ktime; 358 mm_segment_t old_fs; 359 int err; 360 361 if (optlen < sizeof(*up)) 362 return -EINVAL; 363 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 364 __get_user(ktime.tv_sec, &up->tv_sec) || 365 __get_user(ktime.tv_usec, &up->tv_usec)) 366 return -EFAULT; 367 old_fs = get_fs(); 368 set_fs(KERNEL_DS); 369 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 370 set_fs(old_fs); 371 372 return err; 373} 374 375static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 376 char __user *optval, unsigned int optlen) 377{ 378 if (optname == SO_ATTACH_FILTER) 379 return do_set_attach_filter(sock, level, optname, 380 optval, optlen); 381 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 382 return do_set_sock_timeout(sock, level, optname, optval, optlen); 383 384 return sock_setsockopt(sock, level, optname, optval, optlen); 385} 386 387asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 388 char __user *optval, unsigned int optlen) 389{ 390 int err; 391 struct socket *sock = sockfd_lookup(fd, &err); 392 393 if (sock) { 394 err = security_socket_setsockopt(sock, level, optname); 395 if (err) { 396 sockfd_put(sock); 397 return err; 398 } 399 400 if (level == SOL_SOCKET) 401 err = compat_sock_setsockopt(sock, level, 402 optname, optval, optlen); 403 else if (sock->ops->compat_setsockopt) 404 err = sock->ops->compat_setsockopt(sock, level, 405 optname, optval, optlen); 406 else 407 err = sock->ops->setsockopt(sock, level, 408 optname, optval, optlen); 409 sockfd_put(sock); 410 } 411 return err; 412} 413 414static int do_get_sock_timeout(struct socket *sock, int level, int optname, 415 char __user *optval, int __user *optlen) 416{ 417 struct compat_timeval __user *up; 418 struct timeval ktime; 419 mm_segment_t old_fs; 420 int len, err; 421 422 up = (struct compat_timeval __user *) optval; 423 if (get_user(len, optlen)) 424 return -EFAULT; 425 if (len < sizeof(*up)) 426 return -EINVAL; 427 len = sizeof(ktime); 428 old_fs = get_fs(); 429 set_fs(KERNEL_DS); 430 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 431 set_fs(old_fs); 432 433 if (!err) { 434 if (put_user(sizeof(*up), optlen) || 435 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 436 __put_user(ktime.tv_sec, &up->tv_sec) || 437 __put_user(ktime.tv_usec, &up->tv_usec)) 438 err = -EFAULT; 439 } 440 return err; 441} 442 443static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 444 char __user *optval, int __user *optlen) 445{ 446 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 447 return do_get_sock_timeout(sock, level, optname, optval, optlen); 448 return sock_getsockopt(sock, level, optname, optval, optlen); 449} 450 451int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 452{ 453 struct compat_timeval __user *ctv; 454 int err; 455 struct timeval tv; 456 457 if (COMPAT_USE_64BIT_TIME) 458 return sock_get_timestamp(sk, userstamp); 459 460 ctv = (struct compat_timeval __user *) userstamp; 461 err = -ENOENT; 462 if (!sock_flag(sk, SOCK_TIMESTAMP)) 463 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 464 tv = ktime_to_timeval(sk->sk_stamp); 465 if (tv.tv_sec == -1) 466 return err; 467 if (tv.tv_sec == 0) { 468 sk->sk_stamp = ktime_get_real(); 469 tv = ktime_to_timeval(sk->sk_stamp); 470 } 471 err = 0; 472 if (put_user(tv.tv_sec, &ctv->tv_sec) || 473 put_user(tv.tv_usec, &ctv->tv_usec)) 474 err = -EFAULT; 475 return err; 476} 477EXPORT_SYMBOL(compat_sock_get_timestamp); 478 479int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 480{ 481 struct compat_timespec __user *ctv; 482 int err; 483 struct timespec ts; 484 485 if (COMPAT_USE_64BIT_TIME) 486 return sock_get_timestampns (sk, userstamp); 487 488 ctv = (struct compat_timespec __user *) userstamp; 489 err = -ENOENT; 490 if (!sock_flag(sk, SOCK_TIMESTAMP)) 491 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 492 ts = ktime_to_timespec(sk->sk_stamp); 493 if (ts.tv_sec == -1) 494 return err; 495 if (ts.tv_sec == 0) { 496 sk->sk_stamp = ktime_get_real(); 497 ts = ktime_to_timespec(sk->sk_stamp); 498 } 499 err = 0; 500 if (put_user(ts.tv_sec, &ctv->tv_sec) || 501 put_user(ts.tv_nsec, &ctv->tv_nsec)) 502 err = -EFAULT; 503 return err; 504} 505EXPORT_SYMBOL(compat_sock_get_timestampns); 506 507asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 508 char __user *optval, int __user *optlen) 509{ 510 int err; 511 struct socket *sock = sockfd_lookup(fd, &err); 512 513 if (sock) { 514 err = security_socket_getsockopt(sock, level, optname); 515 if (err) { 516 sockfd_put(sock); 517 return err; 518 } 519 520 if (level == SOL_SOCKET) 521 err = compat_sock_getsockopt(sock, level, 522 optname, optval, optlen); 523 else if (sock->ops->compat_getsockopt) 524 err = sock->ops->compat_getsockopt(sock, level, 525 optname, optval, optlen); 526 else 527 err = sock->ops->getsockopt(sock, level, 528 optname, optval, optlen); 529 sockfd_put(sock); 530 } 531 return err; 532} 533 534struct compat_group_req { 535 __u32 gr_interface; 536 struct __kernel_sockaddr_storage gr_group 537 __attribute__ ((aligned(4))); 538} __packed; 539 540struct compat_group_source_req { 541 __u32 gsr_interface; 542 struct __kernel_sockaddr_storage gsr_group 543 __attribute__ ((aligned(4))); 544 struct __kernel_sockaddr_storage gsr_source 545 __attribute__ ((aligned(4))); 546} __packed; 547 548struct compat_group_filter { 549 __u32 gf_interface; 550 struct __kernel_sockaddr_storage gf_group 551 __attribute__ ((aligned(4))); 552 __u32 gf_fmode; 553 __u32 gf_numsrc; 554 struct __kernel_sockaddr_storage gf_slist[1] 555 __attribute__ ((aligned(4))); 556} __packed; 557 558#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 559 sizeof(struct __kernel_sockaddr_storage)) 560 561 562int compat_mc_setsockopt(struct sock *sock, int level, int optname, 563 char __user *optval, unsigned int optlen, 564 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 565{ 566 char __user *koptval = optval; 567 int koptlen = optlen; 568 569 switch (optname) { 570 case MCAST_JOIN_GROUP: 571 case MCAST_LEAVE_GROUP: 572 { 573 struct compat_group_req __user *gr32 = (void *)optval; 574 struct group_req __user *kgr = 575 compat_alloc_user_space(sizeof(struct group_req)); 576 u32 interface; 577 578 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 579 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 580 __get_user(interface, &gr32->gr_interface) || 581 __put_user(interface, &kgr->gr_interface) || 582 copy_in_user(&kgr->gr_group, &gr32->gr_group, 583 sizeof(kgr->gr_group))) 584 return -EFAULT; 585 koptval = (char __user *)kgr; 586 koptlen = sizeof(struct group_req); 587 break; 588 } 589 case MCAST_JOIN_SOURCE_GROUP: 590 case MCAST_LEAVE_SOURCE_GROUP: 591 case MCAST_BLOCK_SOURCE: 592 case MCAST_UNBLOCK_SOURCE: 593 { 594 struct compat_group_source_req __user *gsr32 = (void *)optval; 595 struct group_source_req __user *kgsr = compat_alloc_user_space( 596 sizeof(struct group_source_req)); 597 u32 interface; 598 599 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 600 !access_ok(VERIFY_WRITE, kgsr, 601 sizeof(struct group_source_req)) || 602 __get_user(interface, &gsr32->gsr_interface) || 603 __put_user(interface, &kgsr->gsr_interface) || 604 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 605 sizeof(kgsr->gsr_group)) || 606 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 607 sizeof(kgsr->gsr_source))) 608 return -EFAULT; 609 koptval = (char __user *)kgsr; 610 koptlen = sizeof(struct group_source_req); 611 break; 612 } 613 case MCAST_MSFILTER: 614 { 615 struct compat_group_filter __user *gf32 = (void *)optval; 616 struct group_filter __user *kgf; 617 u32 interface, fmode, numsrc; 618 619 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 620 __get_user(interface, &gf32->gf_interface) || 621 __get_user(fmode, &gf32->gf_fmode) || 622 __get_user(numsrc, &gf32->gf_numsrc)) 623 return -EFAULT; 624 koptlen = optlen + sizeof(struct group_filter) - 625 sizeof(struct compat_group_filter); 626 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 627 return -EINVAL; 628 kgf = compat_alloc_user_space(koptlen); 629 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 630 __put_user(interface, &kgf->gf_interface) || 631 __put_user(fmode, &kgf->gf_fmode) || 632 __put_user(numsrc, &kgf->gf_numsrc) || 633 copy_in_user(&kgf->gf_group, &gf32->gf_group, 634 sizeof(kgf->gf_group)) || 635 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 636 numsrc * sizeof(kgf->gf_slist[0])))) 637 return -EFAULT; 638 koptval = (char __user *)kgf; 639 break; 640 } 641 642 default: 643 break; 644 } 645 return setsockopt(sock, level, optname, koptval, koptlen); 646} 647EXPORT_SYMBOL(compat_mc_setsockopt); 648 649int compat_mc_getsockopt(struct sock *sock, int level, int optname, 650 char __user *optval, int __user *optlen, 651 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 652{ 653 struct compat_group_filter __user *gf32 = (void *)optval; 654 struct group_filter __user *kgf; 655 int __user *koptlen; 656 u32 interface, fmode, numsrc; 657 int klen, ulen, err; 658 659 if (optname != MCAST_MSFILTER) 660 return getsockopt(sock, level, optname, optval, optlen); 661 662 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 663 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 664 __get_user(ulen, optlen)) 665 return -EFAULT; 666 667 /* adjust len for pad */ 668 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 669 670 if (klen < GROUP_FILTER_SIZE(0)) 671 return -EINVAL; 672 673 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 674 __put_user(klen, koptlen)) 675 return -EFAULT; 676 677 /* have to allow space for previous compat_alloc_user_space, too */ 678 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 679 680 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 681 __get_user(interface, &gf32->gf_interface) || 682 __get_user(fmode, &gf32->gf_fmode) || 683 __get_user(numsrc, &gf32->gf_numsrc) || 684 __put_user(interface, &kgf->gf_interface) || 685 __put_user(fmode, &kgf->gf_fmode) || 686 __put_user(numsrc, &kgf->gf_numsrc) || 687 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 688 return -EFAULT; 689 690 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 691 if (err) 692 return err; 693 694 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 695 __get_user(klen, koptlen)) 696 return -EFAULT; 697 698 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 699 700 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 701 __put_user(ulen, optlen)) 702 return -EFAULT; 703 704 if (!access_ok(VERIFY_READ, kgf, klen) || 705 !access_ok(VERIFY_WRITE, gf32, ulen) || 706 __get_user(interface, &kgf->gf_interface) || 707 __get_user(fmode, &kgf->gf_fmode) || 708 __get_user(numsrc, &kgf->gf_numsrc) || 709 __put_user(interface, &gf32->gf_interface) || 710 __put_user(fmode, &gf32->gf_fmode) || 711 __put_user(numsrc, &gf32->gf_numsrc)) 712 return -EFAULT; 713 if (numsrc) { 714 int copylen; 715 716 klen -= GROUP_FILTER_SIZE(0); 717 copylen = numsrc * sizeof(gf32->gf_slist[0]); 718 if (copylen > klen) 719 copylen = klen; 720 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 721 return -EFAULT; 722 } 723 return err; 724} 725EXPORT_SYMBOL(compat_mc_getsockopt); 726 727 728/* Argument list sizes for compat_sys_socketcall */ 729#define AL(x) ((x) * sizeof(u32)) 730static unsigned char nas[21] = { 731 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 732 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 733 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 734 AL(4), AL(5), AL(4) 735}; 736#undef AL 737 738asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 739{ 740 if (flags & MSG_CMSG_COMPAT) 741 return -EINVAL; 742 return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 743} 744 745asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, 746 unsigned int vlen, unsigned int flags) 747{ 748 if (flags & MSG_CMSG_COMPAT) 749 return -EINVAL; 750 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 751 flags | MSG_CMSG_COMPAT); 752} 753 754asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 755{ 756 if (flags & MSG_CMSG_COMPAT) 757 return -EINVAL; 758 return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 759} 760 761asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags) 762{ 763 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 764} 765 766asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len, 767 unsigned int flags, struct sockaddr __user *addr, 768 int __user *addrlen) 769{ 770 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 771} 772 773asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, 774 unsigned int vlen, unsigned int flags, 775 struct compat_timespec __user *timeout) 776{ 777 int datagrams; 778 struct timespec ktspec; 779 780 if (flags & MSG_CMSG_COMPAT) 781 return -EINVAL; 782 783 if (timeout == NULL) 784 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 785 flags | MSG_CMSG_COMPAT, NULL); 786 787 if (compat_get_timespec(&ktspec, timeout)) 788 return -EFAULT; 789 790 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 791 flags | MSG_CMSG_COMPAT, &ktspec); 792 if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) 793 datagrams = -EFAULT; 794 795 return datagrams; 796} 797 798asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 799{ 800 int ret; 801 u32 a[6]; 802 u32 a0, a1; 803 804 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 805 return -EINVAL; 806 if (copy_from_user(a, args, nas[call])) 807 return -EFAULT; 808 a0 = a[0]; 809 a1 = a[1]; 810 811 switch (call) { 812 case SYS_SOCKET: 813 ret = sys_socket(a0, a1, a[2]); 814 break; 815 case SYS_BIND: 816 ret = sys_bind(a0, compat_ptr(a1), a[2]); 817 break; 818 case SYS_CONNECT: 819 ret = sys_connect(a0, compat_ptr(a1), a[2]); 820 break; 821 case SYS_LISTEN: 822 ret = sys_listen(a0, a1); 823 break; 824 case SYS_ACCEPT: 825 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 826 break; 827 case SYS_GETSOCKNAME: 828 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 829 break; 830 case SYS_GETPEERNAME: 831 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 832 break; 833 case SYS_SOCKETPAIR: 834 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 835 break; 836 case SYS_SEND: 837 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 838 break; 839 case SYS_SENDTO: 840 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 841 break; 842 case SYS_RECV: 843 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 844 break; 845 case SYS_RECVFROM: 846 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 847 compat_ptr(a[4]), compat_ptr(a[5])); 848 break; 849 case SYS_SHUTDOWN: 850 ret = sys_shutdown(a0, a1); 851 break; 852 case SYS_SETSOCKOPT: 853 ret = compat_sys_setsockopt(a0, a1, a[2], 854 compat_ptr(a[3]), a[4]); 855 break; 856 case SYS_GETSOCKOPT: 857 ret = compat_sys_getsockopt(a0, a1, a[2], 858 compat_ptr(a[3]), compat_ptr(a[4])); 859 break; 860 case SYS_SENDMSG: 861 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 862 break; 863 case SYS_SENDMMSG: 864 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 865 break; 866 case SYS_RECVMSG: 867 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 868 break; 869 case SYS_RECVMMSG: 870 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 871 compat_ptr(a[4])); 872 break; 873 case SYS_ACCEPT4: 874 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 875 break; 876 default: 877 ret = -EINVAL; 878 break; 879 } 880 return ret; 881} 882