compat.c revision 92f37fd2ee805aa77925c1e64fd56088b46094fc
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/netfilter_ipv4/ip_tables.h> 24#include <linux/security.h> 25 26#include <net/scm.h> 27#include <net/sock.h> 28#include <asm/uaccess.h> 29#include <net/compat.h> 30 31static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 32 struct compat_iovec __user *uiov32, 33 int niov) 34{ 35 int tot_len = 0; 36 37 while (niov > 0) { 38 compat_uptr_t buf; 39 compat_size_t len; 40 41 if (get_user(len, &uiov32->iov_len) || 42 get_user(buf, &uiov32->iov_base)) { 43 tot_len = -EFAULT; 44 break; 45 } 46 tot_len += len; 47 kiov->iov_base = compat_ptr(buf); 48 kiov->iov_len = (__kernel_size_t) len; 49 uiov32++; 50 kiov++; 51 niov--; 52 } 53 return tot_len; 54} 55 56int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 57{ 58 compat_uptr_t tmp1, tmp2, tmp3; 59 60 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 61 __get_user(tmp1, &umsg->msg_name) || 62 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 63 __get_user(tmp2, &umsg->msg_iov) || 64 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 65 __get_user(tmp3, &umsg->msg_control) || 66 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 67 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 68 return -EFAULT; 69 kmsg->msg_name = compat_ptr(tmp1); 70 kmsg->msg_iov = compat_ptr(tmp2); 71 kmsg->msg_control = compat_ptr(tmp3); 72 return 0; 73} 74 75/* I've named the args so it is easy to tell whose space the pointers are in. */ 76int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 77 char *kern_address, int mode) 78{ 79 int tot_len; 80 81 if (kern_msg->msg_namelen) { 82 if (mode==VERIFY_READ) { 83 int err = move_addr_to_kernel(kern_msg->msg_name, 84 kern_msg->msg_namelen, 85 kern_address); 86 if (err < 0) 87 return err; 88 } 89 kern_msg->msg_name = kern_address; 90 } else 91 kern_msg->msg_name = NULL; 92 93 tot_len = iov_from_user_compat_to_kern(kern_iov, 94 (struct compat_iovec __user *)kern_msg->msg_iov, 95 kern_msg->msg_iovlen); 96 if (tot_len >= 0) 97 kern_msg->msg_iov = kern_iov; 98 99 return tot_len; 100} 101 102/* Bleech... */ 103#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 104 105#define CMSG_COMPAT_DATA(cmsg) \ 106 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 107#define CMSG_COMPAT_SPACE(len) \ 108 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 109#define CMSG_COMPAT_LEN(len) \ 110 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 111 112#define CMSG_COMPAT_FIRSTHDR(msg) \ 113 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 114 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 115 (struct compat_cmsghdr __user *)NULL) 116 117#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 118 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 119 (ucmlen) <= (unsigned long) \ 120 ((mhdr)->msg_controllen - \ 121 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 122 123static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 124 struct compat_cmsghdr __user *cmsg, int cmsg_len) 125{ 126 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 127 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 128 msg->msg_controllen) 129 return NULL; 130 return (struct compat_cmsghdr __user *)ptr; 131} 132 133/* There is a lot of hair here because the alignment rules (and 134 * thus placement) of cmsg headers and length are different for 135 * 32-bit apps. -DaveM 136 */ 137int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 138 unsigned char *stackbuf, int stackbuf_size) 139{ 140 struct compat_cmsghdr __user *ucmsg; 141 struct cmsghdr *kcmsg, *kcmsg_base; 142 compat_size_t ucmlen; 143 __kernel_size_t kcmlen, tmp; 144 int err = -EFAULT; 145 146 kcmlen = 0; 147 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 148 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 149 while (ucmsg != NULL) { 150 if (get_user(ucmlen, &ucmsg->cmsg_len)) 151 return -EFAULT; 152 153 /* Catch bogons. */ 154 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 155 return -EINVAL; 156 157 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 158 CMSG_ALIGN(sizeof(struct cmsghdr))); 159 tmp = CMSG_ALIGN(tmp); 160 kcmlen += tmp; 161 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 162 } 163 if (kcmlen == 0) 164 return -EINVAL; 165 166 /* The kcmlen holds the 64-bit version of the control length. 167 * It may not be modified as we do not stick it into the kmsg 168 * until we have successfully copied over all of the data 169 * from the user. 170 */ 171 if (kcmlen > stackbuf_size) 172 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 173 if (kcmsg == NULL) 174 return -ENOBUFS; 175 176 /* Now copy them over neatly. */ 177 memset(kcmsg, 0, kcmlen); 178 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 179 while (ucmsg != NULL) { 180 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 181 goto Efault; 182 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 183 goto Einval; 184 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 185 CMSG_ALIGN(sizeof(struct cmsghdr))); 186 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 187 goto Einval; 188 kcmsg->cmsg_len = tmp; 189 tmp = CMSG_ALIGN(tmp); 190 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 191 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 192 copy_from_user(CMSG_DATA(kcmsg), 193 CMSG_COMPAT_DATA(ucmsg), 194 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 195 goto Efault; 196 197 /* Advance. */ 198 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 199 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 200 } 201 202 /* Ok, looks like we made it. Hook it up and return success. */ 203 kmsg->msg_control = kcmsg_base; 204 kmsg->msg_controllen = kcmlen; 205 return 0; 206 207Einval: 208 err = -EINVAL; 209Efault: 210 if (kcmsg_base != (struct cmsghdr *)stackbuf) 211 sock_kfree_s(sk, kcmsg_base, kcmlen); 212 return err; 213} 214 215int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 216{ 217 struct compat_timeval ctv; 218 struct compat_timespec cts; 219 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 220 struct compat_cmsghdr cmhdr; 221 int cmlen; 222 223 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 224 kmsg->msg_flags |= MSG_CTRUNC; 225 return 0; /* XXX: return error? check spec. */ 226 } 227 228 if (level == SOL_SOCKET && type == SO_TIMESTAMP) { 229 struct timeval *tv = (struct timeval *)data; 230 ctv.tv_sec = tv->tv_sec; 231 ctv.tv_usec = tv->tv_usec; 232 data = &ctv; 233 len = sizeof(ctv); 234 } 235 if (level == SOL_SOCKET && type == SO_TIMESTAMPNS) { 236 struct timespec *ts = (struct timespec *)data; 237 cts.tv_sec = ts->tv_sec; 238 cts.tv_nsec = ts->tv_nsec; 239 data = &cts; 240 len = sizeof(cts); 241 } 242 243 cmlen = CMSG_COMPAT_LEN(len); 244 if (kmsg->msg_controllen < cmlen) { 245 kmsg->msg_flags |= MSG_CTRUNC; 246 cmlen = kmsg->msg_controllen; 247 } 248 cmhdr.cmsg_level = level; 249 cmhdr.cmsg_type = type; 250 cmhdr.cmsg_len = cmlen; 251 252 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 253 return -EFAULT; 254 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 255 return -EFAULT; 256 cmlen = CMSG_COMPAT_SPACE(len); 257 kmsg->msg_control += cmlen; 258 kmsg->msg_controllen -= cmlen; 259 return 0; 260} 261 262void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 263{ 264 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 265 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 266 int fdnum = scm->fp->count; 267 struct file **fp = scm->fp->fp; 268 int __user *cmfptr; 269 int err = 0, i; 270 271 if (fdnum < fdmax) 272 fdmax = fdnum; 273 274 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 275 int new_fd; 276 err = security_file_receive(fp[i]); 277 if (err) 278 break; 279 err = get_unused_fd(); 280 if (err < 0) 281 break; 282 new_fd = err; 283 err = put_user(new_fd, cmfptr); 284 if (err) { 285 put_unused_fd(new_fd); 286 break; 287 } 288 /* Bump the usage count and install the file. */ 289 get_file(fp[i]); 290 fd_install(new_fd, fp[i]); 291 } 292 293 if (i > 0) { 294 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 295 err = put_user(SOL_SOCKET, &cm->cmsg_level); 296 if (!err) 297 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 298 if (!err) 299 err = put_user(cmlen, &cm->cmsg_len); 300 if (!err) { 301 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 302 kmsg->msg_control += cmlen; 303 kmsg->msg_controllen -= cmlen; 304 } 305 } 306 if (i < fdnum) 307 kmsg->msg_flags |= MSG_CTRUNC; 308 309 /* 310 * All of the files that fit in the message have had their 311 * usage counts incremented, so we just free the list. 312 */ 313 __scm_destroy(scm); 314} 315 316/* 317 * For now, we assume that the compatibility and native version 318 * of struct ipt_entry are the same - sfr. FIXME 319 */ 320struct compat_ipt_replace { 321 char name[IPT_TABLE_MAXNAMELEN]; 322 u32 valid_hooks; 323 u32 num_entries; 324 u32 size; 325 u32 hook_entry[NF_IP_NUMHOOKS]; 326 u32 underflow[NF_IP_NUMHOOKS]; 327 u32 num_counters; 328 compat_uptr_t counters; /* struct ipt_counters * */ 329 struct ipt_entry entries[0]; 330}; 331 332static int do_netfilter_replace(int fd, int level, int optname, 333 char __user *optval, int optlen) 334{ 335 struct compat_ipt_replace __user *urepl; 336 struct ipt_replace __user *repl_nat; 337 char name[IPT_TABLE_MAXNAMELEN]; 338 u32 origsize, tmp32, num_counters; 339 unsigned int repl_nat_size; 340 int ret; 341 int i; 342 compat_uptr_t ucntrs; 343 344 urepl = (struct compat_ipt_replace __user *)optval; 345 if (get_user(origsize, &urepl->size)) 346 return -EFAULT; 347 348 /* Hack: Causes ipchains to give correct error msg --RR */ 349 if (optlen != sizeof(*urepl) + origsize) 350 return -ENOPROTOOPT; 351 352 /* XXX Assumes that size of ipt_entry is the same both in 353 * native and compat environments. 354 */ 355 repl_nat_size = sizeof(*repl_nat) + origsize; 356 repl_nat = compat_alloc_user_space(repl_nat_size); 357 358 ret = -EFAULT; 359 if (put_user(origsize, &repl_nat->size)) 360 goto out; 361 362 if (!access_ok(VERIFY_READ, urepl, optlen) || 363 !access_ok(VERIFY_WRITE, repl_nat, optlen)) 364 goto out; 365 366 if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) || 367 __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name))) 368 goto out; 369 370 if (__get_user(tmp32, &urepl->valid_hooks) || 371 __put_user(tmp32, &repl_nat->valid_hooks)) 372 goto out; 373 374 if (__get_user(tmp32, &urepl->num_entries) || 375 __put_user(tmp32, &repl_nat->num_entries)) 376 goto out; 377 378 if (__get_user(num_counters, &urepl->num_counters) || 379 __put_user(num_counters, &repl_nat->num_counters)) 380 goto out; 381 382 if (__get_user(ucntrs, &urepl->counters) || 383 __put_user(compat_ptr(ucntrs), &repl_nat->counters)) 384 goto out; 385 386 if (__copy_in_user(&repl_nat->entries[0], 387 &urepl->entries[0], 388 origsize)) 389 goto out; 390 391 for (i = 0; i < NF_IP_NUMHOOKS; i++) { 392 if (__get_user(tmp32, &urepl->hook_entry[i]) || 393 __put_user(tmp32, &repl_nat->hook_entry[i]) || 394 __get_user(tmp32, &urepl->underflow[i]) || 395 __put_user(tmp32, &repl_nat->underflow[i])) 396 goto out; 397 } 398 399 /* 400 * Since struct ipt_counters just contains two u_int64_t members 401 * we can just do the access_ok check here and pass the (converted) 402 * pointer into the standard syscall. We hope that the pointer is 403 * not misaligned ... 404 */ 405 if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs), 406 num_counters * sizeof(struct ipt_counters))) 407 goto out; 408 409 410 ret = sys_setsockopt(fd, level, optname, 411 (char __user *)repl_nat, repl_nat_size); 412 413out: 414 return ret; 415} 416 417/* 418 * A struct sock_filter is architecture independent. 419 */ 420struct compat_sock_fprog { 421 u16 len; 422 compat_uptr_t filter; /* struct sock_filter * */ 423}; 424 425static int do_set_attach_filter(struct socket *sock, int level, int optname, 426 char __user *optval, int optlen) 427{ 428 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 429 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 430 compat_uptr_t ptr; 431 u16 len; 432 433 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 434 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 435 __get_user(len, &fprog32->len) || 436 __get_user(ptr, &fprog32->filter) || 437 __put_user(len, &kfprog->len) || 438 __put_user(compat_ptr(ptr), &kfprog->filter)) 439 return -EFAULT; 440 441 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 442 sizeof(struct sock_fprog)); 443} 444 445static int do_set_sock_timeout(struct socket *sock, int level, 446 int optname, char __user *optval, int optlen) 447{ 448 struct compat_timeval __user *up = (struct compat_timeval __user *) optval; 449 struct timeval ktime; 450 mm_segment_t old_fs; 451 int err; 452 453 if (optlen < sizeof(*up)) 454 return -EINVAL; 455 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 456 __get_user(ktime.tv_sec, &up->tv_sec) || 457 __get_user(ktime.tv_usec, &up->tv_usec)) 458 return -EFAULT; 459 old_fs = get_fs(); 460 set_fs(KERNEL_DS); 461 err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime)); 462 set_fs(old_fs); 463 464 return err; 465} 466 467static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 468 char __user *optval, int optlen) 469{ 470 if (optname == SO_ATTACH_FILTER) 471 return do_set_attach_filter(sock, level, optname, 472 optval, optlen); 473 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 474 return do_set_sock_timeout(sock, level, optname, optval, optlen); 475 476 return sock_setsockopt(sock, level, optname, optval, optlen); 477} 478 479asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 480 char __user *optval, int optlen) 481{ 482 int err; 483 struct socket *sock; 484 485 if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE) 486 return do_netfilter_replace(fd, level, optname, 487 optval, optlen); 488 489 if (optlen < 0) 490 return -EINVAL; 491 492 if ((sock = sockfd_lookup(fd, &err))!=NULL) 493 { 494 err = security_socket_setsockopt(sock,level,optname); 495 if (err) { 496 sockfd_put(sock); 497 return err; 498 } 499 500 if (level == SOL_SOCKET) 501 err = compat_sock_setsockopt(sock, level, 502 optname, optval, optlen); 503 else if (sock->ops->compat_setsockopt) 504 err = sock->ops->compat_setsockopt(sock, level, 505 optname, optval, optlen); 506 else 507 err = sock->ops->setsockopt(sock, level, 508 optname, optval, optlen); 509 sockfd_put(sock); 510 } 511 return err; 512} 513 514static int do_get_sock_timeout(struct socket *sock, int level, int optname, 515 char __user *optval, int __user *optlen) 516{ 517 struct compat_timeval __user *up; 518 struct timeval ktime; 519 mm_segment_t old_fs; 520 int len, err; 521 522 up = (struct compat_timeval __user *) optval; 523 if (get_user(len, optlen)) 524 return -EFAULT; 525 if (len < sizeof(*up)) 526 return -EINVAL; 527 len = sizeof(ktime); 528 old_fs = get_fs(); 529 set_fs(KERNEL_DS); 530 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 531 set_fs(old_fs); 532 533 if (!err) { 534 if (put_user(sizeof(*up), optlen) || 535 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 536 __put_user(ktime.tv_sec, &up->tv_sec) || 537 __put_user(ktime.tv_usec, &up->tv_usec)) 538 err = -EFAULT; 539 } 540 return err; 541} 542 543static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 544 char __user *optval, int __user *optlen) 545{ 546 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 547 return do_get_sock_timeout(sock, level, optname, optval, optlen); 548 return sock_getsockopt(sock, level, optname, optval, optlen); 549} 550 551int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 552{ 553 struct compat_timeval __user *ctv = 554 (struct compat_timeval __user*) userstamp; 555 int err = -ENOENT; 556 struct timeval tv; 557 558 if (!sock_flag(sk, SOCK_TIMESTAMP)) 559 sock_enable_timestamp(sk); 560 tv = ktime_to_timeval(sk->sk_stamp); 561 if (tv.tv_sec == -1) 562 return err; 563 if (tv.tv_sec == 0) { 564 sk->sk_stamp = ktime_get_real(); 565 tv = ktime_to_timeval(sk->sk_stamp); 566 } 567 err = 0; 568 if (put_user(tv.tv_sec, &ctv->tv_sec) || 569 put_user(tv.tv_usec, &ctv->tv_usec)) 570 err = -EFAULT; 571 return err; 572} 573EXPORT_SYMBOL(compat_sock_get_timestamp); 574 575int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 576{ 577 struct compat_timespec __user *ctv = 578 (struct compat_timespec __user*) userstamp; 579 int err = -ENOENT; 580 struct timespec ts; 581 582 if (!sock_flag(sk, SOCK_TIMESTAMP)) 583 sock_enable_timestamp(sk); 584 ts = ktime_to_timespec(sk->sk_stamp); 585 if (ts.tv_sec == -1) 586 return err; 587 if (ts.tv_sec == 0) { 588 sk->sk_stamp = ktime_get_real(); 589 ts = ktime_to_timespec(sk->sk_stamp); 590 } 591 err = 0; 592 if (put_user(ts.tv_sec, &ctv->tv_sec) || 593 put_user(ts.tv_nsec, &ctv->tv_nsec)) 594 err = -EFAULT; 595 return err; 596} 597EXPORT_SYMBOL(compat_sock_get_timestampns); 598 599asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 600 char __user *optval, int __user *optlen) 601{ 602 int err; 603 struct socket *sock; 604 605 if ((sock = sockfd_lookup(fd, &err))!=NULL) 606 { 607 err = security_socket_getsockopt(sock, level, 608 optname); 609 if (err) { 610 sockfd_put(sock); 611 return err; 612 } 613 614 if (level == SOL_SOCKET) 615 err = compat_sock_getsockopt(sock, level, 616 optname, optval, optlen); 617 else if (sock->ops->compat_getsockopt) 618 err = sock->ops->compat_getsockopt(sock, level, 619 optname, optval, optlen); 620 else 621 err = sock->ops->getsockopt(sock, level, 622 optname, optval, optlen); 623 sockfd_put(sock); 624 } 625 return err; 626} 627/* Argument list sizes for compat_sys_socketcall */ 628#define AL(x) ((x) * sizeof(u32)) 629static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 630 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 631 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 632#undef AL 633 634asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 635{ 636 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 637} 638 639asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 640{ 641 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 642} 643 644asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 645{ 646 int ret; 647 u32 a[6]; 648 u32 a0, a1; 649 650 if (call < SYS_SOCKET || call > SYS_RECVMSG) 651 return -EINVAL; 652 if (copy_from_user(a, args, nas[call])) 653 return -EFAULT; 654 a0 = a[0]; 655 a1 = a[1]; 656 657 switch (call) { 658 case SYS_SOCKET: 659 ret = sys_socket(a0, a1, a[2]); 660 break; 661 case SYS_BIND: 662 ret = sys_bind(a0, compat_ptr(a1), a[2]); 663 break; 664 case SYS_CONNECT: 665 ret = sys_connect(a0, compat_ptr(a1), a[2]); 666 break; 667 case SYS_LISTEN: 668 ret = sys_listen(a0, a1); 669 break; 670 case SYS_ACCEPT: 671 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2])); 672 break; 673 case SYS_GETSOCKNAME: 674 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 675 break; 676 case SYS_GETPEERNAME: 677 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 678 break; 679 case SYS_SOCKETPAIR: 680 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 681 break; 682 case SYS_SEND: 683 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 684 break; 685 case SYS_SENDTO: 686 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 687 break; 688 case SYS_RECV: 689 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]); 690 break; 691 case SYS_RECVFROM: 692 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5])); 693 break; 694 case SYS_SHUTDOWN: 695 ret = sys_shutdown(a0,a1); 696 break; 697 case SYS_SETSOCKOPT: 698 ret = compat_sys_setsockopt(a0, a1, a[2], 699 compat_ptr(a[3]), a[4]); 700 break; 701 case SYS_GETSOCKOPT: 702 ret = compat_sys_getsockopt(a0, a1, a[2], 703 compat_ptr(a[3]), compat_ptr(a[4])); 704 break; 705 case SYS_SENDMSG: 706 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 707 break; 708 case SYS_RECVMSG: 709 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 710 break; 711 default: 712 ret = -EINVAL; 713 break; 714 } 715 return ret; 716} 717