compat.c revision 60c2ffd3d2cf12008747d920ae118df119006003
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, 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; 392 393 if ((sock = sockfd_lookup(fd, &err))!=NULL) 394 { 395 err = security_socket_setsockopt(sock,level,optname); 396 if (err) { 397 sockfd_put(sock); 398 return err; 399 } 400 401 if (level == SOL_SOCKET) 402 err = compat_sock_setsockopt(sock, level, 403 optname, optval, optlen); 404 else if (sock->ops->compat_setsockopt) 405 err = sock->ops->compat_setsockopt(sock, level, 406 optname, optval, optlen); 407 else 408 err = sock->ops->setsockopt(sock, level, 409 optname, optval, optlen); 410 sockfd_put(sock); 411 } 412 return err; 413} 414 415static int do_get_sock_timeout(struct socket *sock, int level, int optname, 416 char __user *optval, int __user *optlen) 417{ 418 struct compat_timeval __user *up; 419 struct timeval ktime; 420 mm_segment_t old_fs; 421 int len, err; 422 423 up = (struct compat_timeval __user *) optval; 424 if (get_user(len, optlen)) 425 return -EFAULT; 426 if (len < sizeof(*up)) 427 return -EINVAL; 428 len = sizeof(ktime); 429 old_fs = get_fs(); 430 set_fs(KERNEL_DS); 431 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 432 set_fs(old_fs); 433 434 if (!err) { 435 if (put_user(sizeof(*up), optlen) || 436 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 437 __put_user(ktime.tv_sec, &up->tv_sec) || 438 __put_user(ktime.tv_usec, &up->tv_usec)) 439 err = -EFAULT; 440 } 441 return err; 442} 443 444static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 445 char __user *optval, int __user *optlen) 446{ 447 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 448 return do_get_sock_timeout(sock, level, optname, optval, optlen); 449 return sock_getsockopt(sock, level, optname, optval, optlen); 450} 451 452int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 453{ 454 struct compat_timeval __user *ctv = 455 (struct compat_timeval __user*) userstamp; 456 int err = -ENOENT; 457 struct timeval tv; 458 459 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 (struct compat_timespec __user*) userstamp; 480 int err = -ENOENT; 481 struct timespec ts; 482 483 if (!sock_flag(sk, SOCK_TIMESTAMP)) 484 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 485 ts = ktime_to_timespec(sk->sk_stamp); 486 if (ts.tv_sec == -1) 487 return err; 488 if (ts.tv_sec == 0) { 489 sk->sk_stamp = ktime_get_real(); 490 ts = ktime_to_timespec(sk->sk_stamp); 491 } 492 err = 0; 493 if (put_user(ts.tv_sec, &ctv->tv_sec) || 494 put_user(ts.tv_nsec, &ctv->tv_nsec)) 495 err = -EFAULT; 496 return err; 497} 498EXPORT_SYMBOL(compat_sock_get_timestampns); 499 500asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 501 char __user *optval, int __user *optlen) 502{ 503 int err; 504 struct socket *sock; 505 506 if ((sock = sockfd_lookup(fd, &err))!=NULL) 507 { 508 err = security_socket_getsockopt(sock, level, 509 optname); 510 if (err) { 511 sockfd_put(sock); 512 return err; 513 } 514 515 if (level == SOL_SOCKET) 516 err = compat_sock_getsockopt(sock, level, 517 optname, optval, optlen); 518 else if (sock->ops->compat_getsockopt) 519 err = sock->ops->compat_getsockopt(sock, level, 520 optname, optval, optlen); 521 else 522 err = sock->ops->getsockopt(sock, level, 523 optname, optval, optlen); 524 sockfd_put(sock); 525 } 526 return err; 527} 528 529struct compat_group_req { 530 __u32 gr_interface; 531 struct __kernel_sockaddr_storage gr_group 532 __attribute__ ((aligned(4))); 533} __attribute__ ((packed)); 534 535struct compat_group_source_req { 536 __u32 gsr_interface; 537 struct __kernel_sockaddr_storage gsr_group 538 __attribute__ ((aligned(4))); 539 struct __kernel_sockaddr_storage gsr_source 540 __attribute__ ((aligned(4))); 541} __attribute__ ((packed)); 542 543struct compat_group_filter { 544 __u32 gf_interface; 545 struct __kernel_sockaddr_storage gf_group 546 __attribute__ ((aligned(4))); 547 __u32 gf_fmode; 548 __u32 gf_numsrc; 549 struct __kernel_sockaddr_storage gf_slist[1] 550 __attribute__ ((aligned(4))); 551} __attribute__ ((packed)); 552 553#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ 554 sizeof(struct __kernel_sockaddr_storage)) 555 556 557int compat_mc_setsockopt(struct sock *sock, int level, int optname, 558 char __user *optval, unsigned int optlen, 559 int (*setsockopt)(struct sock *,int,int,char __user *,unsigned int)) 560{ 561 char __user *koptval = optval; 562 int koptlen = optlen; 563 564 switch (optname) { 565 case MCAST_JOIN_GROUP: 566 case MCAST_LEAVE_GROUP: 567 { 568 struct compat_group_req __user *gr32 = (void *)optval; 569 struct group_req __user *kgr = 570 compat_alloc_user_space(sizeof(struct group_req)); 571 u32 interface; 572 573 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || 574 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || 575 __get_user(interface, &gr32->gr_interface) || 576 __put_user(interface, &kgr->gr_interface) || 577 copy_in_user(&kgr->gr_group, &gr32->gr_group, 578 sizeof(kgr->gr_group))) 579 return -EFAULT; 580 koptval = (char __user *)kgr; 581 koptlen = sizeof(struct group_req); 582 break; 583 } 584 case MCAST_JOIN_SOURCE_GROUP: 585 case MCAST_LEAVE_SOURCE_GROUP: 586 case MCAST_BLOCK_SOURCE: 587 case MCAST_UNBLOCK_SOURCE: 588 { 589 struct compat_group_source_req __user *gsr32 = (void *)optval; 590 struct group_source_req __user *kgsr = compat_alloc_user_space( 591 sizeof(struct group_source_req)); 592 u32 interface; 593 594 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || 595 !access_ok(VERIFY_WRITE, kgsr, 596 sizeof(struct group_source_req)) || 597 __get_user(interface, &gsr32->gsr_interface) || 598 __put_user(interface, &kgsr->gsr_interface) || 599 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, 600 sizeof(kgsr->gsr_group)) || 601 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, 602 sizeof(kgsr->gsr_source))) 603 return -EFAULT; 604 koptval = (char __user *)kgsr; 605 koptlen = sizeof(struct group_source_req); 606 break; 607 } 608 case MCAST_MSFILTER: 609 { 610 struct compat_group_filter __user *gf32 = (void *)optval; 611 struct group_filter __user *kgf; 612 u32 interface, fmode, numsrc; 613 614 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 615 __get_user(interface, &gf32->gf_interface) || 616 __get_user(fmode, &gf32->gf_fmode) || 617 __get_user(numsrc, &gf32->gf_numsrc)) 618 return -EFAULT; 619 koptlen = optlen + sizeof(struct group_filter) - 620 sizeof(struct compat_group_filter); 621 if (koptlen < GROUP_FILTER_SIZE(numsrc)) 622 return -EINVAL; 623 kgf = compat_alloc_user_space(koptlen); 624 if (!access_ok(VERIFY_WRITE, kgf, koptlen) || 625 __put_user(interface, &kgf->gf_interface) || 626 __put_user(fmode, &kgf->gf_fmode) || 627 __put_user(numsrc, &kgf->gf_numsrc) || 628 copy_in_user(&kgf->gf_group, &gf32->gf_group, 629 sizeof(kgf->gf_group)) || 630 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, 631 numsrc * sizeof(kgf->gf_slist[0])))) 632 return -EFAULT; 633 koptval = (char __user *)kgf; 634 break; 635 } 636 637 default: 638 break; 639 } 640 return setsockopt(sock, level, optname, koptval, koptlen); 641} 642 643EXPORT_SYMBOL(compat_mc_setsockopt); 644 645int compat_mc_getsockopt(struct sock *sock, int level, int optname, 646 char __user *optval, int __user *optlen, 647 int (*getsockopt)(struct sock *,int,int,char __user *,int __user *)) 648{ 649 struct compat_group_filter __user *gf32 = (void *)optval; 650 struct group_filter __user *kgf; 651 int __user *koptlen; 652 u32 interface, fmode, numsrc; 653 int klen, ulen, err; 654 655 if (optname != MCAST_MSFILTER) 656 return getsockopt(sock, level, optname, optval, optlen); 657 658 koptlen = compat_alloc_user_space(sizeof(*koptlen)); 659 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || 660 __get_user(ulen, optlen)) 661 return -EFAULT; 662 663 /* adjust len for pad */ 664 klen = ulen + sizeof(*kgf) - sizeof(*gf32); 665 666 if (klen < GROUP_FILTER_SIZE(0)) 667 return -EINVAL; 668 669 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || 670 __put_user(klen, koptlen)) 671 return -EFAULT; 672 673 /* have to allow space for previous compat_alloc_user_space, too */ 674 kgf = compat_alloc_user_space(klen+sizeof(*optlen)); 675 676 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || 677 __get_user(interface, &gf32->gf_interface) || 678 __get_user(fmode, &gf32->gf_fmode) || 679 __get_user(numsrc, &gf32->gf_numsrc) || 680 __put_user(interface, &kgf->gf_interface) || 681 __put_user(fmode, &kgf->gf_fmode) || 682 __put_user(numsrc, &kgf->gf_numsrc) || 683 copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group))) 684 return -EFAULT; 685 686 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); 687 if (err) 688 return err; 689 690 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || 691 __get_user(klen, koptlen)) 692 return -EFAULT; 693 694 ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); 695 696 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || 697 __put_user(ulen, optlen)) 698 return -EFAULT; 699 700 if (!access_ok(VERIFY_READ, kgf, klen) || 701 !access_ok(VERIFY_WRITE, gf32, ulen) || 702 __get_user(interface, &kgf->gf_interface) || 703 __get_user(fmode, &kgf->gf_fmode) || 704 __get_user(numsrc, &kgf->gf_numsrc) || 705 __put_user(interface, &gf32->gf_interface) || 706 __put_user(fmode, &gf32->gf_fmode) || 707 __put_user(numsrc, &gf32->gf_numsrc)) 708 return -EFAULT; 709 if (numsrc) { 710 int copylen; 711 712 klen -= GROUP_FILTER_SIZE(0); 713 copylen = numsrc * sizeof(gf32->gf_slist[0]); 714 if (copylen > klen) 715 copylen = klen; 716 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) 717 return -EFAULT; 718 } 719 return err; 720} 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[20]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 728 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 729 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3), 730 AL(4),AL(5)}; 731#undef AL 732 733asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 734{ 735 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 736} 737 738asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 739{ 740 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 741} 742 743asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags) 744{ 745 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT); 746} 747 748asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len, 749 unsigned flags, struct sockaddr __user *addr, 750 int __user *addrlen) 751{ 752 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen); 753} 754 755asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, 756 unsigned vlen, unsigned int flags, 757 struct compat_timespec __user *timeout) 758{ 759 int datagrams; 760 struct timespec ktspec; 761 762 if (timeout == NULL) 763 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 764 flags | MSG_CMSG_COMPAT, NULL); 765 766 if (get_user(ktspec.tv_sec, &timeout->tv_sec) || 767 get_user(ktspec.tv_nsec, &timeout->tv_nsec)) 768 return -EFAULT; 769 770 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, 771 flags | MSG_CMSG_COMPAT, &ktspec); 772 if (datagrams > 0 && 773 (put_user(ktspec.tv_sec, &timeout->tv_sec) || 774 put_user(ktspec.tv_nsec, &timeout->tv_nsec))) 775 datagrams = -EFAULT; 776 777 return datagrams; 778} 779 780asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 781{ 782 int ret; 783 u32 a[6]; 784 u32 a0, a1; 785 786 if (call < SYS_SOCKET || call > SYS_RECVMMSG) 787 return -EINVAL; 788 if (copy_from_user(a, args, nas[call])) 789 return -EFAULT; 790 a0 = a[0]; 791 a1 = a[1]; 792 793 switch (call) { 794 case SYS_SOCKET: 795 ret = sys_socket(a0, a1, a[2]); 796 break; 797 case SYS_BIND: 798 ret = sys_bind(a0, compat_ptr(a1), a[2]); 799 break; 800 case SYS_CONNECT: 801 ret = sys_connect(a0, compat_ptr(a1), a[2]); 802 break; 803 case SYS_LISTEN: 804 ret = sys_listen(a0, a1); 805 break; 806 case SYS_ACCEPT: 807 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); 808 break; 809 case SYS_GETSOCKNAME: 810 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 811 break; 812 case SYS_GETPEERNAME: 813 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 814 break; 815 case SYS_SOCKETPAIR: 816 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 817 break; 818 case SYS_SEND: 819 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 820 break; 821 case SYS_SENDTO: 822 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 823 break; 824 case SYS_RECV: 825 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]); 826 break; 827 case SYS_RECVFROM: 828 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], 829 compat_ptr(a[4]), compat_ptr(a[5])); 830 break; 831 case SYS_SHUTDOWN: 832 ret = sys_shutdown(a0,a1); 833 break; 834 case SYS_SETSOCKOPT: 835 ret = compat_sys_setsockopt(a0, a1, a[2], 836 compat_ptr(a[3]), a[4]); 837 break; 838 case SYS_GETSOCKOPT: 839 ret = compat_sys_getsockopt(a0, a1, a[2], 840 compat_ptr(a[3]), compat_ptr(a[4])); 841 break; 842 case SYS_SENDMSG: 843 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 844 break; 845 case SYS_RECVMSG: 846 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 847 break; 848 case SYS_RECVMMSG: 849 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], 850 compat_ptr(a[4])); 851 break; 852 case SYS_ACCEPT4: 853 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); 854 break; 855 default: 856 ret = -EINVAL; 857 break; 858 } 859 return ret; 860} 861