compat.c revision a7526eb5d06b0084ef12d7b168d008fcf516caab
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 kmsg->msg_name = compat_ptr(tmp1); 75 kmsg->msg_iov = compat_ptr(tmp2); 76 kmsg->msg_control = compat_ptr(tmp3); 77 return 0; 78} 79 80/* I've named the args so it is easy to tell whose space the pointers are in. */ 81int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 82 struct sockaddr_storage *kern_address, int mode) 83{ 84 int tot_len; 85 86 if (kern_msg->msg_namelen) { 87 if (mode == VERIFY_READ) { 88 int err = move_addr_to_kernel(kern_msg->msg_name, 89 kern_msg->msg_namelen, 90 kern_address); 91 if (err < 0) 92 return err; 93 } 94 kern_msg->msg_name = kern_address; 95 } else 96 kern_msg->msg_name = NULL; 97 98 tot_len = iov_from_user_compat_to_kern(kern_iov, 99 (struct compat_iovec __user *)kern_msg->msg_iov, 100 kern_msg->msg_iovlen); 101 if (tot_len >= 0) 102 kern_msg->msg_iov = kern_iov; 103 104 return tot_len; 105} 106 107/* Bleech... */ 108#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 109 110#define CMSG_COMPAT_DATA(cmsg) \ 111 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 112#define CMSG_COMPAT_SPACE(len) \ 113 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 114#define CMSG_COMPAT_LEN(len) \ 115 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 116 117#define CMSG_COMPAT_FIRSTHDR(msg) \ 118 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 119 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 120 (struct compat_cmsghdr __user *)NULL) 121 122#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 123 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 124 (ucmlen) <= (unsigned long) \ 125 ((mhdr)->msg_controllen - \ 126 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 127 128static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 129 struct compat_cmsghdr __user *cmsg, int cmsg_len) 130{ 131 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 132 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 133 msg->msg_controllen) 134 return NULL; 135 return (struct compat_cmsghdr __user *)ptr; 136} 137 138/* There is a lot of hair here because the alignment rules (and 139 * thus placement) of cmsg headers and length are different for 140 * 32-bit apps. -DaveM 141 */ 142int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 143 unsigned char *stackbuf, int stackbuf_size) 144{ 145 struct compat_cmsghdr __user *ucmsg; 146 struct cmsghdr *kcmsg, *kcmsg_base; 147 compat_size_t ucmlen; 148 __kernel_size_t kcmlen, tmp; 149 int err = -EFAULT; 150 151 kcmlen = 0; 152 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 153 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 154 while (ucmsg != NULL) { 155 if (get_user(ucmlen, &ucmsg->cmsg_len)) 156 return -EFAULT; 157 158 /* Catch bogons. */ 159 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 160 return -EINVAL; 161 162 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 163 CMSG_ALIGN(sizeof(struct cmsghdr))); 164 tmp = CMSG_ALIGN(tmp); 165 kcmlen += tmp; 166 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 167 } 168 if (kcmlen == 0) 169 return -EINVAL; 170 171 /* The kcmlen holds the 64-bit version of the control length. 172 * It may not be modified as we do not stick it into the kmsg 173 * until we have successfully copied over all of the data 174 * from the user. 175 */ 176 if (kcmlen > stackbuf_size) 177 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 178 if (kcmsg == NULL) 179 return -ENOBUFS; 180 181 /* Now copy them over neatly. */ 182 memset(kcmsg, 0, kcmlen); 183 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 184 while (ucmsg != NULL) { 185 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 186 goto Efault; 187 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 188 goto Einval; 189 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 190 CMSG_ALIGN(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 - CMSG_COMPAT_ALIGN(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 /* Ok, looks like we made it. Hook it up and return success. */ 208 kmsg->msg_control = kcmsg_base; 209 kmsg->msg_controllen = kcmlen; 210 return 0; 211 212Einval: 213 err = -EINVAL; 214Efault: 215 if (kcmsg_base != (struct cmsghdr *)stackbuf) 216 sock_kfree_s(sk, kcmsg_base, kcmlen); 217 return err; 218} 219 220int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 221{ 222 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 223 struct compat_cmsghdr cmhdr; 224 struct compat_timeval ctv; 225 struct compat_timespec cts[3]; 226 int cmlen; 227 228 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 229 kmsg->msg_flags |= MSG_CTRUNC; 230 return 0; /* XXX: return error? check spec. */ 231 } 232 233 if (!COMPAT_USE_64BIT_TIME) { 234 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { 235 struct timeval *tv = (struct timeval *)data; 236 ctv.tv_sec = tv->tv_sec; 237 ctv.tv_usec = tv->tv_usec; 238 data = &ctv; 239 len = sizeof(ctv); 240 } 241 if (level == SOL_SOCKET && 242 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { 243 int count = type == SCM_TIMESTAMPNS ? 1 : 3; 244 int i; 245 struct timespec *ts = (struct timespec *)data; 246 for (i = 0; i < count; i++) { 247 cts[i].tv_sec = ts[i].tv_sec; 248 cts[i].tv_nsec = ts[i].tv_nsec; 249 } 250 data = &cts; 251 len = sizeof(cts[0]) * count; 252 } 253 } 254 255 cmlen = CMSG_COMPAT_LEN(len); 256 if (kmsg->msg_controllen < cmlen) { 257 kmsg->msg_flags |= MSG_CTRUNC; 258 cmlen = kmsg->msg_controllen; 259 } 260 cmhdr.cmsg_level = level; 261 cmhdr.cmsg_type = type; 262 cmhdr.cmsg_len = cmlen; 263 264 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 265 return -EFAULT; 266 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 267 return -EFAULT; 268 cmlen = CMSG_COMPAT_SPACE(len); 269 if (kmsg->msg_controllen < cmlen) 270 cmlen = kmsg->msg_controllen; 271 kmsg->msg_control += cmlen; 272 kmsg->msg_controllen -= cmlen; 273 return 0; 274} 275 276void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 277{ 278 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 279 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 280 int fdnum = scm->fp->count; 281 struct file **fp = scm->fp->fp; 282 int __user *cmfptr; 283 int err = 0, i; 284 285 if (fdnum < fdmax) 286 fdmax = fdnum; 287 288 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 289 int new_fd; 290 err = security_file_receive(fp[i]); 291 if (err) 292 break; 293 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 294 ? O_CLOEXEC : 0); 295 if (err < 0) 296 break; 297 new_fd = err; 298 err = put_user(new_fd, cmfptr); 299 if (err) { 300 put_unused_fd(new_fd); 301 break; 302 } 303 /* Bump the usage count and install the file. */ 304 fd_install(new_fd, get_file(fp[i])); 305 } 306 307 if (i > 0) { 308 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 309 err = put_user(SOL_SOCKET, &cm->cmsg_level); 310 if (!err) 311 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 312 if (!err) 313 err = put_user(cmlen, &cm->cmsg_len); 314 if (!err) { 315 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 316 kmsg->msg_control += cmlen; 317 kmsg->msg_controllen -= cmlen; 318 } 319 } 320 if (i < fdnum) 321 kmsg->msg_flags |= MSG_CTRUNC; 322 323 /* 324 * All of the files that fit in the message have had their 325 * usage counts incremented, so we just free the list. 326 */ 327 __scm_destroy(scm); 328} 329 330static int do_set_attach_filter(struct socket *sock, int level, int optname, 331 char __user *optval, unsigned int optlen) 332{ 333 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 334 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 335 compat_uptr_t ptr; 336 u16 len; 337 338 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 339 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 340 __get_user(len, &fprog32->len) || 341 __get_user(ptr, &fprog32->filter) || 342 __put_user(len, &kfprog->len) || 343 __put_user(compat_ptr(ptr), &kfprog->filter)) 344 return -EFAULT; 345 346 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 347 sizeof(struct sock_fprog)); 348} 349 350static int do_set_sock_timeout(struct socket *sock, int level, 351 int optname, char __user *optval, unsigned int optlen) 352{ 353 struct compat_timeval __user *up = (struct compat_timeval __user *)optval; 354 struct timeval ktime; 355 mm_segment_t old_fs; 356 int err; 357 358 if (optlen < sizeof(*up)) 359 return -EINVAL; 360 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 361 __get_user(ktime.tv_sec, &up->tv_sec) || 362 __get_user(ktime.tv_usec, &up->tv_usec)) 363 return -EFAULT; 364 old_fs = get_fs(); 365 set_fs(KERNEL_DS); 366 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); 367 set_fs(old_fs); 368 369 return err; 370} 371 372static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 373 char __user *optval, unsigned int optlen) 374{ 375 if (optname == SO_ATTACH_FILTER) 376 return do_set_attach_filter(sock, level, optname, 377 optval, optlen); 378 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 379 return do_set_sock_timeout(sock, level, optname, optval, optlen); 380 381 return sock_setsockopt(sock, level, optname, optval, optlen); 382} 383 384asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 385 char __user *optval, unsigned int optlen) 386{ 387 int err; 388 struct socket *sock = sockfd_lookup(fd, &err); 389 390 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 411static int do_get_sock_timeout(struct socket *sock, int level, int optname, 412 char __user *optval, int __user *optlen) 413{ 414 struct compat_timeval __user *up; 415 struct timeval ktime; 416 mm_segment_t old_fs; 417 int len, err; 418 419 up = (struct compat_timeval __user *) optval; 420 if (get_user(len, optlen)) 421 return -EFAULT; 422 if (len < sizeof(*up)) 423 return -EINVAL; 424 len = sizeof(ktime); 425 old_fs = get_fs(); 426 set_fs(KERNEL_DS); 427 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 428 set_fs(old_fs); 429 430 if (!err) { 431 if (put_user(sizeof(*up), optlen) || 432 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 433 __put_user(ktime.tv_sec, &up->tv_sec) || 434 __put_user(ktime.tv_usec, &up->tv_usec)) 435 err = -EFAULT; 436 } 437 return err; 438} 439 440static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 441 char __user *optval, int __user *optlen) 442{ 443 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 444 return do_get_sock_timeout(sock, level, optname, optval, optlen); 445 return sock_getsockopt(sock, level, optname, optval, optlen); 446} 447 448int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 449{ 450 struct compat_timeval __user *ctv; 451 int err; 452 struct timeval tv; 453 454 if (COMPAT_USE_64BIT_TIME) 455 return sock_get_timestamp(sk, userstamp); 456 457 ctv = (struct compat_timeval __user *) userstamp; 458 err = -ENOENT; 459 if (!sock_flag(sk, SOCK_TIMESTAMP)) 460 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 461 tv = ktime_to_timeval(sk->sk_stamp); 462 if (tv.tv_sec == -1) 463 return err; 464 if (tv.tv_sec == 0) { 465 sk->sk_stamp = ktime_get_real(); 466 tv = ktime_to_timeval(sk->sk_stamp); 467 } 468 err = 0; 469 if (put_user(tv.tv_sec, &ctv->tv_sec) || 470 put_user(tv.tv_usec, &ctv->tv_usec)) 471 err = -EFAULT; 472 return err; 473} 474EXPORT_SYMBOL(compat_sock_get_timestamp); 475 476int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 477{ 478 struct compat_timespec __user *ctv; 479 int err; 480 struct timespec ts; 481 482 if (COMPAT_USE_64BIT_TIME) 483 return sock_get_timestampns (sk, userstamp); 484 485 ctv = (struct compat_timespec __user *) userstamp; 486 err = -ENOENT; 487 if (!sock_flag(sk, SOCK_TIMESTAMP)) 488 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 489 ts = ktime_to_timespec(sk->sk_stamp); 490 if (ts.tv_sec == -1) 491 return err; 492 if (ts.tv_sec == 0) { 493 sk->sk_stamp = ktime_get_real(); 494 ts = ktime_to_timespec(sk->sk_stamp); 495 } 496 err = 0; 497 if (put_user(ts.tv_sec, &ctv->tv_sec) || 498 put_user(ts.tv_nsec, &ctv->tv_nsec)) 499 err = -EFAULT; 500 return err; 501} 502EXPORT_SYMBOL(compat_sock_get_timestampns); 503 504asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 505 char __user *optval, int __user *optlen) 506{ 507 int err; 508 struct socket *sock = sockfd_lookup(fd, &err); 509 510 if (sock) { 511 err = security_socket_getsockopt(sock, level, optname); 512 if (err) { 513 sockfd_put(sock); 514 return err; 515 } 516 517 if (level == SOL_SOCKET) 518 err = compat_sock_getsockopt(sock, level, 519 optname, optval, optlen); 520 else if (sock->ops->compat_getsockopt) 521 err = sock->ops->compat_getsockopt(sock, level, 522 optname, optval, optlen); 523 else 524 err = sock->ops->getsockopt(sock, level, 525 optname, optval, optlen); 526 sockfd_put(sock); 527 } 528 return err; 529} 530 531struct compat_group_req { 532 __u32 gr_interface; 533 struct __kernel_sockaddr_storage gr_group 534 __attribute__ ((aligned(4))); 535} __packed; 536 537struct compat_group_source_req { 538 __u32 gsr_interface; 539 struct __kernel_sockaddr_storage gsr_group 540 __attribute__ ((aligned(4))); 541 struct __kernel_sockaddr_storage gsr_source 542 __attribute__ ((aligned(4))); 543} __packed; 544 545struct compat_group_filter { 546 __u32 gf_interface; 547 struct __kernel_sockaddr_storage gf_group 548 __attribute__ ((aligned(4))); 549 __u32 gf_fmode; 550 __u32 gf_numsrc; 551 struct __kernel_sockaddr_storage gf_slist[1] 552 __attribute__ ((aligned(4))); 553} __packed; 554 555#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 556 sizeof(struct __kernel_sockaddr_storage)) 557 558 559int compat_mc_setsockopt(struct sock *sock, int level, int optname, 560 char __user *optval, unsigned int optlen, 561 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) 562{ 563 char __user *koptval = optval; 564 int koptlen = optlen; 565 566 switch (optname) { 567 case MCAST_JOIN_GROUP: 568 case MCAST_LEAVE_GROUP: 569 { 570 struct compat_group_req __user *gr32 = (void *)optval; 571 struct group_req __user *kgr = 572 compat_alloc_user_space(sizeof(struct group_req)); 573 u32 interface; 574 575 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 576 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 577 __get_user(interface, &gr32->gr_interface) || 578 __put_user(interface, &kgr->gr_interface) || 579 copy_in_user(&kgr->gr_group, &gr32->gr_group, 580 sizeof(kgr->gr_group))) 581 return -EFAULT; 582 koptval = (char __user *)kgr; 583 koptlen = sizeof(struct group_req); 584 break; 585 } 586 case MCAST_JOIN_SOURCE_GROUP: 587 case MCAST_LEAVE_SOURCE_GROUP: 588 case MCAST_BLOCK_SOURCE: 589 case MCAST_UNBLOCK_SOURCE: 590 { 591 struct compat_group_source_req __user *gsr32 = (void *)optval; 592 struct group_source_req __user *kgsr = compat_alloc_user_space( 593 sizeof(struct group_source_req)); 594 u32 interface; 595 596 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 597 !access_ok(VERIFY_WRITE, kgsr, 598 sizeof(struct group_source_req)) || 599 __get_user(interface, &gsr32->gsr_interface) || 600 __put_user(interface, &kgsr->gsr_interface) || 601 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 602 sizeof(kgsr->gsr_group)) || 603 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 604 sizeof(kgsr->gsr_source))) 605 return -EFAULT; 606 koptval = (char __user *)kgsr; 607 koptlen = sizeof(struct group_source_req); 608 break; 609 } 610 case MCAST_MSFILTER: 611 { 612 struct compat_group_filter __user *gf32 = (void *)optval; 613 struct group_filter __user *kgf; 614 u32 interface, fmode, numsrc; 615 616 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 617 __get_user(interface, &gf32->gf_interface) || 618 __get_user(fmode, &gf32->gf_fmode) || 619 __get_user(numsrc, &gf32->gf_numsrc)) 620 return -EFAULT; 621 koptlen = optlen + sizeof(struct group_filter) - 622 sizeof(struct compat_group_filter); 623 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 624 return -EINVAL; 625 kgf = compat_alloc_user_space(koptlen); 626 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 627 __put_user(interface, &kgf->gf_interface) || 628 __put_user(fmode, &kgf->gf_fmode) || 629 __put_user(numsrc, &kgf->gf_numsrc) || 630 copy_in_user(&kgf->gf_group, &gf32->gf_group, 631 sizeof(kgf->gf_group)) || 632 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 633 numsrc * sizeof(kgf->gf_slist[0])))) 634 return -EFAULT; 635 koptval = (char __user *)kgf; 636 break; 637 } 638 639 default: 640 break; 641 } 642 return setsockopt(sock, level, optname, koptval, koptlen); 643} 644EXPORT_SYMBOL(compat_mc_setsockopt); 645 646int compat_mc_getsockopt(struct sock *sock, int level, int optname, 647 char __user *optval, int __user *optlen, 648 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) 649{ 650 struct compat_group_filter __user *gf32 = (void *)optval; 651 struct group_filter __user *kgf; 652 int __user *koptlen; 653 u32 interface, fmode, numsrc; 654 int klen, ulen, err; 655 656 if (optname != MCAST_MSFILTER) 657 return getsockopt(sock, level, optname, optval, optlen); 658 659 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 660 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 661 __get_user(ulen, optlen)) 662 return -EFAULT; 663 664 /* adjust len for pad */ 665 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 666 667 if (klen < GROUP_FILTER_SIZE(0)) 668 return -EINVAL; 669 670 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 671 __put_user(klen, koptlen)) 672 return -EFAULT; 673 674 /* have to allow space for previous compat_alloc_user_space, too */ 675 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 676 677 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 678 __get_user(interface, &gf32->gf_interface) || 679 __get_user(fmode, &gf32->gf_fmode) || 680 __get_user(numsrc, &gf32->gf_numsrc) || 681 __put_user(interface, &kgf->gf_interface) || 682 __put_user(fmode, &kgf->gf_fmode) || 683 __put_user(numsrc, &kgf->gf_numsrc) || 684 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) 685 return -EFAULT; 686 687 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 688 if (err) 689 return err; 690 691 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 692 __get_user(klen, koptlen)) 693 return -EFAULT; 694 695 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 696 697 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 698 __put_user(ulen, optlen)) 699 return -EFAULT; 700 701 if (!access_ok(VERIFY_READ, kgf, klen) || 702 !access_ok(VERIFY_WRITE, gf32, ulen) || 703 __get_user(interface, &kgf->gf_interface) || 704 __get_user(fmode, &kgf->gf_fmode) || 705 __get_user(numsrc, &kgf->gf_numsrc) || 706 __put_user(interface, &gf32->gf_interface) || 707 __put_user(fmode, &gf32->gf_fmode) || 708 __put_user(numsrc, &gf32->gf_numsrc)) 709 return -EFAULT; 710 if (numsrc) { 711 int copylen; 712 713 klen -= GROUP_FILTER_SIZE(0); 714 copylen = numsrc * sizeof(gf32->gf_slist[0]); 715 if (copylen > klen) 716 copylen = klen; 717 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 718 return -EFAULT; 719 } 720 return err; 721} 722EXPORT_SYMBOL(compat_mc_getsockopt); 723 724 725/* Argument list sizes for compat_sys_socketcall */ 726#define AL(x) ((x) * sizeof(u32)) 727static unsigned char nas[21] = { 728 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 729 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 730 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 731 AL(4), AL(5), AL(4) 732}; 733#undef AL 734 735asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 736{ 737 if (flags & MSG_CMSG_COMPAT) 738 return -EINVAL; 739 return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 740} 741 742asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, 743 unsigned int vlen, unsigned int flags) 744{ 745 if (flags & MSG_CMSG_COMPAT) 746 return -EINVAL; 747 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 748 flags | MSG_CMSG_COMPAT); 749} 750 751asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 752{ 753 if (flags & MSG_CMSG_COMPAT) 754 return -EINVAL; 755 return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 756} 757 758asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags) 759{ 760 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 761} 762 763asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len, 764 unsigned int flags, struct sockaddr __user *addr, 765 int __user *addrlen) 766{ 767 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 768} 769 770asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, 771 unsigned int vlen, unsigned int flags, 772 struct compat_timespec __user *timeout) 773{ 774 int datagrams; 775 struct timespec ktspec; 776 777 if (flags & MSG_CMSG_COMPAT) 778 return -EINVAL; 779 780 if (COMPAT_USE_64BIT_TIME) 781 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 782 flags | MSG_CMSG_COMPAT, 783 (struct timespec *) timeout); 784 785 if (timeout == NULL) 786 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 787 flags | MSG_CMSG_COMPAT, NULL); 788 789 if (get_compat_timespec(&ktspec, timeout)) 790 return -EFAULT; 791 792 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 793 flags | MSG_CMSG_COMPAT, &ktspec); 794 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout)) 795 datagrams = -EFAULT; 796 797 return datagrams; 798} 799 800asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 801{ 802 int ret; 803 u32 a[6]; 804 u32 a0, a1; 805 806 if (call < SYS_SOCKET || call > SYS_SENDMMSG) 807 return -EINVAL; 808 if (copy_from_user(a, args, nas[call])) 809 return -EFAULT; 810 a0 = a[0]; 811 a1 = a[1]; 812 813 switch (call) { 814 case SYS_SOCKET: 815 ret = sys_socket(a0, a1, a[2]); 816 break; 817 case SYS_BIND: 818 ret = sys_bind(a0, compat_ptr(a1), a[2]); 819 break; 820 case SYS_CONNECT: 821 ret = sys_connect(a0, compat_ptr(a1), a[2]); 822 break; 823 case SYS_LISTEN: 824 ret = sys_listen(a0, a1); 825 break; 826 case SYS_ACCEPT: 827 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 828 break; 829 case SYS_GETSOCKNAME: 830 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 831 break; 832 case SYS_GETPEERNAME: 833 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 834 break; 835 case SYS_SOCKETPAIR: 836 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 837 break; 838 case SYS_SEND: 839 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 840 break; 841 case SYS_SENDTO: 842 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 843 break; 844 case SYS_RECV: 845 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 846 break; 847 case SYS_RECVFROM: 848 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 849 compat_ptr(a[4]), compat_ptr(a[5])); 850 break; 851 case SYS_SHUTDOWN: 852 ret = sys_shutdown(a0, a1); 853 break; 854 case SYS_SETSOCKOPT: 855 ret = compat_sys_setsockopt(a0, a1, a[2], 856 compat_ptr(a[3]), a[4]); 857 break; 858 case SYS_GETSOCKOPT: 859 ret = compat_sys_getsockopt(a0, a1, a[2], 860 compat_ptr(a[3]), compat_ptr(a[4])); 861 break; 862 case SYS_SENDMSG: 863 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 864 break; 865 case SYS_SENDMMSG: 866 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); 867 break; 868 case SYS_RECVMSG: 869 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 870 break; 871 case SYS_RECVMMSG: 872 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 873 compat_ptr(a[4])); 874 break; 875 case SYS_ACCEPT4: 876 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 877 break; 878 default: 879 ret = -EINVAL; 880 break; 881 } 882 return ret; 883} 884