compat.c revision 20d4947353be60e909e6b1a79d241457edd6833f
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/fs.h> 16#include <linux/types.h> 17#include <linux/file.h> 18#include <linux/icmpv6.h> 19#include <linux/socket.h> 20#include <linux/syscalls.h> 21#include <linux/filter.h> 22#include <linux/compat.h> 23#include <linux/security.h> 24 25#include <net/scm.h> 26#include <net/sock.h> 27#include <net/ip.h> 28#include <net/ipv6.h> 29#include <asm/uaccess.h> 30#include <net/compat.h> 31 32static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 33 struct compat_iovec __user *uiov32, 34 int niov) 35{ 36 int tot_len = 0; 37 38 while (niov > 0) { 39 compat_uptr_t buf; 40 compat_size_t len; 41 42 if (get_user(len, &uiov32->iov_len) || 43 get_user(buf, &uiov32->iov_base)) { 44 tot_len = -EFAULT; 45 break; 46 } 47 tot_len += len; 48 kiov->iov_base = compat_ptr(buf); 49 kiov->iov_len = (__kernel_size_t) len; 50 uiov32++; 51 kiov++; 52 niov--; 53 } 54 return tot_len; 55} 56 57int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 58{ 59 compat_uptr_t tmp1, tmp2, tmp3; 60 61 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 62 __get_user(tmp1, &umsg->msg_name) || 63 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 64 __get_user(tmp2, &umsg->msg_iov) || 65 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 66 __get_user(tmp3, &umsg->msg_control) || 67 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 68 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 69 return -EFAULT; 70 kmsg->msg_name = compat_ptr(tmp1); 71 kmsg->msg_iov = compat_ptr(tmp2); 72 kmsg->msg_control = compat_ptr(tmp3); 73 return 0; 74} 75 76/* I've named the args so it is easy to tell whose space the pointers are in. */ 77int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 78 struct sockaddr *kern_address, int mode) 79{ 80 int tot_len; 81 82 if (kern_msg->msg_namelen) { 83 if (mode==VERIFY_READ) { 84 int err = move_addr_to_kernel(kern_msg->msg_name, 85 kern_msg->msg_namelen, 86 kern_address); 87 if (err < 0) 88 return err; 89 } 90 kern_msg->msg_name = kern_address; 91 } else 92 kern_msg->msg_name = NULL; 93 94 tot_len = iov_from_user_compat_to_kern(kern_iov, 95 (struct compat_iovec __user *)kern_msg->msg_iov, 96 kern_msg->msg_iovlen); 97 if (tot_len >= 0) 98 kern_msg->msg_iov = kern_iov; 99 100 return tot_len; 101} 102 103/* Bleech... */ 104#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 105 106#define CMSG_COMPAT_DATA(cmsg) \ 107 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 108#define CMSG_COMPAT_SPACE(len) \ 109 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 110#define CMSG_COMPAT_LEN(len) \ 111 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 112 113#define CMSG_COMPAT_FIRSTHDR(msg) \ 114 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 115 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 116 (struct compat_cmsghdr __user *)NULL) 117 118#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 119 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 120 (ucmlen) <= (unsigned long) \ 121 ((mhdr)->msg_controllen - \ 122 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 123 124static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 125 struct compat_cmsghdr __user *cmsg, int cmsg_len) 126{ 127 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 128 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 129 msg->msg_controllen) 130 return NULL; 131 return (struct compat_cmsghdr __user *)ptr; 132} 133 134/* There is a lot of hair here because the alignment rules (and 135 * thus placement) of cmsg headers and length are different for 136 * 32-bit apps. -DaveM 137 */ 138int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 139 unsigned char *stackbuf, int stackbuf_size) 140{ 141 struct compat_cmsghdr __user *ucmsg; 142 struct cmsghdr *kcmsg, *kcmsg_base; 143 compat_size_t ucmlen; 144 __kernel_size_t kcmlen, tmp; 145 int err = -EFAULT; 146 147 kcmlen = 0; 148 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 149 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 150 while (ucmsg != NULL) { 151 if (get_user(ucmlen, &ucmsg->cmsg_len)) 152 return -EFAULT; 153 154 /* Catch bogons. */ 155 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 156 return -EINVAL; 157 158 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 159 CMSG_ALIGN(sizeof(struct cmsghdr))); 160 tmp = CMSG_ALIGN(tmp); 161 kcmlen += tmp; 162 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 163 } 164 if (kcmlen == 0) 165 return -EINVAL; 166 167 /* The kcmlen holds the 64-bit version of the control length. 168 * It may not be modified as we do not stick it into the kmsg 169 * until we have successfully copied over all of the data 170 * from the user. 171 */ 172 if (kcmlen > stackbuf_size) 173 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 174 if (kcmsg == NULL) 175 return -ENOBUFS; 176 177 /* Now copy them over neatly. */ 178 memset(kcmsg, 0, kcmlen); 179 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 180 while (ucmsg != NULL) { 181 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 182 goto Efault; 183 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 184 goto Einval; 185 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 186 CMSG_ALIGN(sizeof(struct cmsghdr))); 187 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 188 goto Einval; 189 kcmsg->cmsg_len = tmp; 190 tmp = CMSG_ALIGN(tmp); 191 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 192 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 193 copy_from_user(CMSG_DATA(kcmsg), 194 CMSG_COMPAT_DATA(ucmsg), 195 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 196 goto Efault; 197 198 /* Advance. */ 199 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 200 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 201 } 202 203 /* Ok, looks like we made it. Hook it up and return success. */ 204 kmsg->msg_control = kcmsg_base; 205 kmsg->msg_controllen = kcmlen; 206 return 0; 207 208Einval: 209 err = -EINVAL; 210Efault: 211 if (kcmsg_base != (struct cmsghdr *)stackbuf) 212 sock_kfree_s(sk, kcmsg_base, kcmlen); 213 return err; 214} 215 216int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 217{ 218 struct compat_timeval ctv; 219 struct compat_timespec cts[3]; 220 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 221 struct compat_cmsghdr cmhdr; 222 int cmlen; 223 224 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 225 kmsg->msg_flags |= MSG_CTRUNC; 226 return 0; /* XXX: return error? check spec. */ 227 } 228 229 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 230 struct timeval *tv = (struct timeval *)data; 231 ctv.tv_sec = tv->tv_sec; 232 ctv.tv_usec = tv->tv_usec; 233 data = &ctv; 234 len = sizeof(ctv); 235 } 236 if (level == SOL_SOCKET && 237 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 238 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 239 int i; 240 struct timespec *ts = (struct timespec *)data; 241 for (i = 0; i < count; i++) { 242 cts[i].tv_sec = ts[i].tv_sec; 243 cts[i].tv_nsec = ts[i].tv_nsec; 244 } 245 data = &cts; 246 len = sizeof(cts[0]) * count; 247 } 248 249 cmlen = CMSG_COMPAT_LEN(len); 250 if (kmsg->msg_controllen < cmlen) { 251 kmsg->msg_flags |= MSG_CTRUNC; 252 cmlen = kmsg->msg_controllen; 253 } 254 cmhdr.cmsg_level = level; 255 cmhdr.cmsg_type = type; 256 cmhdr.cmsg_len = cmlen; 257 258 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 259 return -EFAULT; 260 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 261 return -EFAULT; 262 cmlen = CMSG_COMPAT_SPACE(len); 263 if (kmsg->msg_controllen < cmlen) 264 cmlen = kmsg->msg_controllen; 265 kmsg->msg_control += cmlen; 266 kmsg->msg_controllen -= cmlen; 267 return 0; 268} 269 270void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 271{ 272 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 273 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 274 int fdnum = scm->fp->count; 275 struct file **fp = scm->fp->fp; 276 int __user *cmfptr; 277 int err = 0, i; 278 279 if (fdnum < fdmax) 280 fdmax = fdnum; 281 282 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 283 int new_fd; 284 err = security_file_receive(fp[i]); 285 if (err) 286 break; 287 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 288 ? O_CLOEXEC : 0); 289 if (err < 0) 290 break; 291 new_fd = err; 292 err = put_user(new_fd, cmfptr); 293 if (err) { 294 put_unused_fd(new_fd); 295 break; 296 } 297 /* Bump the usage count and install the file. */ 298 get_file(fp[i]); 299 fd_install(new_fd, fp[i]); 300 } 301 302 if (i > 0) { 303 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 304 err = put_user(SOL_SOCKET, &cm->cmsg_level); 305 if (!err) 306 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 307 if (!err) 308 err = put_user(cmlen, &cm->cmsg_len); 309 if (!err) { 310 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 311 kmsg->msg_control += cmlen; 312 kmsg->msg_controllen -= cmlen; 313 } 314 } 315 if (i < fdnum) 316 kmsg->msg_flags |= MSG_CTRUNC; 317 318 /* 319 * All of the files that fit in the message have had their 320 * usage counts incremented, so we just free the list. 321 */ 322 __scm_destroy(scm); 323} 324 325/* 326 * A struct sock_filter is architecture independent. 327 */ 328struct compat_sock_fprog { 329 u16 len; 330 compat_uptr_t filter; /* struct sock_filter * */ 331}; 332 333static int do_set_attach_filter(struct socket *sock, int level, int optname, 334 char __user *optval, 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, 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, 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, int optlen) 389{ 390 int err; 391 struct socket *sock; 392 393 if (optlen < 0) 394 return -EINVAL; 395 396 if ((sock = sockfd_lookup(fd, &err))!=NULL) 397 { 398 err = security_socket_setsockopt(sock,level,optname); 399 if (err) { 400 sockfd_put(sock); 401 return err; 402 } 403 404 if (level == SOL_SOCKET) 405 err = compat_sock_setsockopt(sock, level, 406 optname, optval, optlen); 407 else if (sock->ops->compat_setsockopt) 408 err = sock->ops->compat_setsockopt(sock, level, 409 optname, optval, optlen); 410 else 411 err = sock->ops->setsockopt(sock, level, 412 optname, optval, optlen); 413 sockfd_put(sock); 414 } 415 return err; 416} 417 418static int do_get_sock_timeout(struct socket *sock, int level, int optname, 419 char __user *optval, int __user *optlen) 420{ 421 struct compat_timeval __user *up; 422 struct timeval ktime; 423 mm_segment_t old_fs; 424 int len, err; 425 426 up = (struct compat_timeval __user *) optval; 427 if (get_user(len, optlen)) 428 return -EFAULT; 429 if (len < sizeof(*up)) 430 return -EINVAL; 431 len = sizeof(ktime); 432 old_fs = get_fs(); 433 set_fs(KERNEL_DS); 434 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 435 set_fs(old_fs); 436 437 if (!err) { 438 if (put_user(sizeof(*up), optlen) || 439 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 440 __put_user(ktime.tv_sec, &up->tv_sec) || 441 __put_user(ktime.tv_usec, &up->tv_usec)) 442 err = -EFAULT; 443 } 444 return err; 445} 446 447static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 448 char __user *optval, int __user *optlen) 449{ 450 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 451 return do_get_sock_timeout(sock, level, optname, optval, optlen); 452 return sock_getsockopt(sock, level, optname, optval, optlen); 453} 454 455int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 456{ 457 struct compat_timeval __user *ctv = 458 (struct compat_timeval __user*) userstamp; 459 int err = -ENOENT; 460 struct timeval tv; 461 462 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 (struct compat_timespec __user*) userstamp; 483 int err = -ENOENT; 484 struct timespec ts; 485 486 if (!sock_flag(sk, SOCK_TIMESTAMP)) 487 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 488 ts = ktime_to_timespec(sk->sk_stamp); 489 if (ts.tv_sec == -1) 490 return err; 491 if (ts.tv_sec == 0) { 492 sk->sk_stamp = ktime_get_real(); 493 ts = ktime_to_timespec(sk->sk_stamp); 494 } 495 err = 0; 496 if (put_user(ts.tv_sec, &ctv->tv_sec) || 497 put_user(ts.tv_nsec, &ctv->tv_nsec)) 498 err = -EFAULT; 499 return err; 500} 501EXPORT_SYMBOL(compat_sock_get_timestampns); 502 503asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 504 char __user *optval, int __user *optlen) 505{ 506 int err; 507 struct socket *sock; 508 509 if ((sock = sockfd_lookup(fd, &err))!=NULL) 510 { 511 err = security_socket_getsockopt(sock, level, 512 optname); 513 if (err) { 514 sockfd_put(sock); 515 return err; 516 } 517 518 if (level == SOL_SOCKET) 519 err = compat_sock_getsockopt(sock, level, 520 optname, optval, optlen); 521 else if (sock->ops->compat_getsockopt) 522 err = sock->ops->compat_getsockopt(sock, level, 523 optname, optval, optlen); 524 else 525 err = sock->ops->getsockopt(sock, level, 526 optname, optval, optlen); 527 sockfd_put(sock); 528 } 529 return err; 530} 531 532struct compat_group_req { 533 __u32 gr_interface; 534 struct __kernel_sockaddr_storage gr_group 535 __attribute__ ((aligned(4))); 536} __attribute__ ((packed)); 537 538struct compat_group_source_req { 539 __u32 gsr_interface; 540 struct __kernel_sockaddr_storage gsr_group 541 __attribute__ ((aligned(4))); 542 struct __kernel_sockaddr_storage gsr_source 543 __attribute__ ((aligned(4))); 544} __attribute__ ((packed)); 545 546struct compat_group_filter { 547 __u32 gf_interface; 548 struct __kernel_sockaddr_storage gf_group 549 __attribute__ ((aligned(4))); 550 __u32 gf_fmode; 551 __u32 gf_numsrc; 552 struct __kernel_sockaddr_storage gf_slist[1] 553 __attribute__ ((aligned(4))); 554} __attribute__ ((packed)); 555 556#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 557 sizeof(struct __kernel_sockaddr_storage)) 558 559 560int compat_mc_setsockopt(struct sock *sock, int level, int optname, 561 char __user *optval, int optlen, 562 int (*setsockopt)(struct sock *,int,int,char __user *,int)) 563{ 564 char __user *koptval = optval; 565 int koptlen = optlen; 566 567 switch (optname) { 568 case MCAST_JOIN_GROUP: 569 case MCAST_LEAVE_GROUP: 570 { 571 struct compat_group_req __user *gr32 = (void *)optval; 572 struct group_req __user *kgr = 573 compat_alloc_user_space(sizeof(struct group_req)); 574 u32 interface; 575 576 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 577 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 578 __get_user(interface, &gr32->gr_interface) || 579 __put_user(interface, &kgr->gr_interface) || 580 copy_in_user(&kgr->gr_group, &gr32->gr_group, 581 sizeof(kgr->gr_group))) 582 return -EFAULT; 583 koptval = (char __user *)kgr; 584 koptlen = sizeof(struct group_req); 585 break; 586 } 587 case MCAST_JOIN_SOURCE_GROUP: 588 case MCAST_LEAVE_SOURCE_GROUP: 589 case MCAST_BLOCK_SOURCE: 590 case MCAST_UNBLOCK_SOURCE: 591 { 592 struct compat_group_source_req __user *gsr32 = (void *)optval; 593 struct group_source_req __user *kgsr = compat_alloc_user_space( 594 sizeof(struct group_source_req)); 595 u32 interface; 596 597 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 598 !access_ok(VERIFY_WRITE, kgsr, 599 sizeof(struct group_source_req)) || 600 __get_user(interface, &gsr32->gsr_interface) || 601 __put_user(interface, &kgsr->gsr_interface) || 602 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 603 sizeof(kgsr->gsr_group)) || 604 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 605 sizeof(kgsr->gsr_source))) 606 return -EFAULT; 607 koptval = (char __user *)kgsr; 608 koptlen = sizeof(struct group_source_req); 609 break; 610 } 611 case MCAST_MSFILTER: 612 { 613 struct compat_group_filter __user *gf32 = (void *)optval; 614 struct group_filter __user *kgf; 615 u32 interface, fmode, numsrc; 616 617 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 618 __get_user(interface, &gf32->gf_interface) || 619 __get_user(fmode, &gf32->gf_fmode) || 620 __get_user(numsrc, &gf32->gf_numsrc)) 621 return -EFAULT; 622 koptlen = optlen + sizeof(struct group_filter) - 623 sizeof(struct compat_group_filter); 624 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 625 return -EINVAL; 626 kgf = compat_alloc_user_space(koptlen); 627 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 628 __put_user(interface, &kgf->gf_interface) || 629 __put_user(fmode, &kgf->gf_fmode) || 630 __put_user(numsrc, &kgf->gf_numsrc) || 631 copy_in_user(&kgf->gf_group, &gf32->gf_group, 632 sizeof(kgf->gf_group)) || 633 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 634 numsrc * sizeof(kgf->gf_slist[0])))) 635 return -EFAULT; 636 koptval = (char __user *)kgf; 637 break; 638 } 639 640 default: 641 break; 642 } 643 return setsockopt(sock, level, optname, koptval, koptlen); 644} 645 646EXPORT_SYMBOL(compat_mc_setsockopt); 647 648int compat_mc_getsockopt(struct sock *sock, int level, int optname, 649 char __user *optval, int __user *optlen, 650 int (*getsockopt)(struct sock *,int,int,char __user *,int __user *)) 651{ 652 struct compat_group_filter __user *gf32 = (void *)optval; 653 struct group_filter __user *kgf; 654 int __user *koptlen; 655 u32 interface, fmode, numsrc; 656 int klen, ulen, err; 657 658 if (optname != MCAST_MSFILTER) 659 return getsockopt(sock, level, optname, optval, optlen); 660 661 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 662 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 663 __get_user(ulen, optlen)) 664 return -EFAULT; 665 666 /* adjust len for pad */ 667 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 668 669 if (klen < GROUP_FILTER_SIZE(0)) 670 return -EINVAL; 671 672 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 673 __put_user(klen, koptlen)) 674 return -EFAULT; 675 676 /* have to allow space for previous compat_alloc_user_space, too */ 677 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 678 679 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 680 __get_user(interface, &gf32->gf_interface) || 681 __get_user(fmode, &gf32->gf_fmode) || 682 __get_user(numsrc, &gf32->gf_numsrc) || 683 __put_user(interface, &kgf->gf_interface) || 684 __put_user(fmode, &kgf->gf_fmode) || 685 __put_user(numsrc, &kgf->gf_numsrc) || 686 copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group))) 687 return -EFAULT; 688 689 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 690 if (err) 691 return err; 692 693 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 694 __get_user(klen, koptlen)) 695 return -EFAULT; 696 697 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 698 699 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 700 __put_user(ulen, optlen)) 701 return -EFAULT; 702 703 if (!access_ok(VERIFY_READ, kgf, klen) || 704 !access_ok(VERIFY_WRITE, gf32, ulen) || 705 __get_user(interface, &kgf->gf_interface) || 706 __get_user(fmode, &kgf->gf_fmode) || 707 __get_user(numsrc, &kgf->gf_numsrc) || 708 __put_user(interface, &gf32->gf_interface) || 709 __put_user(fmode, &gf32->gf_fmode) || 710 __put_user(numsrc, &gf32->gf_numsrc)) 711 return -EFAULT; 712 if (numsrc) { 713 int copylen; 714 715 klen -= GROUP_FILTER_SIZE(0); 716 copylen = numsrc * sizeof(gf32->gf_slist[0]); 717 if (copylen > klen) 718 copylen = klen; 719 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 720 return -EFAULT; 721 } 722 return err; 723} 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[19]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 731 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 732 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3), 733 AL(4)}; 734#undef AL 735 736asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 737{ 738 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 739} 740 741asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 742{ 743 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 744} 745 746asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 747{ 748 int ret; 749 u32 a[6]; 750 u32 a0, a1; 751 752 if (call < SYS_SOCKET || call > SYS_ACCEPT4) 753 return -EINVAL; 754 if (copy_from_user(a, args, nas[call])) 755 return -EFAULT; 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_send(a0, compat_ptr(a1), a[2], a[3]); 786 break; 787 case SYS_SENDTO: 788 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 789 break; 790 case SYS_RECV: 791 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]); 792 break; 793 case SYS_RECVFROM: 794 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5])); 795 break; 796 case SYS_SHUTDOWN: 797 ret = sys_shutdown(a0,a1); 798 break; 799 case SYS_SETSOCKOPT: 800 ret = compat_sys_setsockopt(a0, a1, a[2], 801 compat_ptr(a[3]), a[4]); 802 break; 803 case SYS_GETSOCKOPT: 804 ret = compat_sys_getsockopt(a0, a1, a[2], 805 compat_ptr(a[3]), compat_ptr(a[4])); 806 break; 807 case SYS_SENDMSG: 808 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 809 break; 810 case SYS_RECVMSG: 811 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 812 break; 813 case SYS_ACCEPT4: 814 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 815 break; 816 default: 817 ret = -EINVAL; 818 break; 819 } 820 return ret; 821} 822