compat.c revision d64d3873721cfe870d49d73c3744f06260779ce7
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/sched.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/netfilter_ipv4/ip_tables.h> 25#include <linux/security.h> 26 27#include <net/scm.h> 28#include <net/sock.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 char *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, 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; 145 146 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 kcmlen += tmp; 160 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 161 } 162 if(kcmlen == 0) 163 return -EINVAL; 164 165 /* The kcmlen holds the 64-bit version of the control length. 166 * It may not be modified as we do not stick it into the kmsg 167 * until we have successfully copied over all of the data 168 * from the user. 169 */ 170 if(kcmlen > stackbuf_size) 171 kcmsg_base = kcmsg = kmalloc(kcmlen, GFP_KERNEL); 172 if(kcmsg == NULL) 173 return -ENOBUFS; 174 175 /* Now copy them over neatly. */ 176 memset(kcmsg, 0, kcmlen); 177 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 178 while(ucmsg != NULL) { 179 __get_user(ucmlen, &ucmsg->cmsg_len); 180 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 181 CMSG_ALIGN(sizeof(struct cmsghdr))); 182 kcmsg->cmsg_len = tmp; 183 __get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level); 184 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type); 185 186 /* Copy over the data. */ 187 if(copy_from_user(CMSG_DATA(kcmsg), 188 CMSG_COMPAT_DATA(ucmsg), 189 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 190 goto out_free_efault; 191 192 /* Advance. */ 193 kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(tmp)); 194 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 195 } 196 197 /* Ok, looks like we made it. Hook it up and return success. */ 198 kmsg->msg_control = kcmsg_base; 199 kmsg->msg_controllen = kcmlen; 200 return 0; 201 202out_free_efault: 203 if(kcmsg_base != (struct cmsghdr *)stackbuf) 204 kfree(kcmsg_base); 205 return -EFAULT; 206} 207 208int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 209{ 210 struct compat_timeval ctv; 211 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 212 struct compat_cmsghdr cmhdr; 213 int cmlen; 214 215 if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 216 kmsg->msg_flags |= MSG_CTRUNC; 217 return 0; /* XXX: return error? check spec. */ 218 } 219 220 if (level == SOL_SOCKET && type == SO_TIMESTAMP) { 221 struct timeval *tv = (struct timeval *)data; 222 ctv.tv_sec = tv->tv_sec; 223 ctv.tv_usec = tv->tv_usec; 224 data = &ctv; 225 len = sizeof(struct compat_timeval); 226 } 227 228 cmlen = CMSG_COMPAT_LEN(len); 229 if(kmsg->msg_controllen < cmlen) { 230 kmsg->msg_flags |= MSG_CTRUNC; 231 cmlen = kmsg->msg_controllen; 232 } 233 cmhdr.cmsg_level = level; 234 cmhdr.cmsg_type = type; 235 cmhdr.cmsg_len = cmlen; 236 237 if(copy_to_user(cm, &cmhdr, sizeof cmhdr)) 238 return -EFAULT; 239 if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 240 return -EFAULT; 241 cmlen = CMSG_COMPAT_SPACE(len); 242 kmsg->msg_control += cmlen; 243 kmsg->msg_controllen -= cmlen; 244 return 0; 245} 246 247void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 248{ 249 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 250 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 251 int fdnum = scm->fp->count; 252 struct file **fp = scm->fp->fp; 253 int __user *cmfptr; 254 int err = 0, i; 255 256 if (fdnum < fdmax) 257 fdmax = fdnum; 258 259 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 260 int new_fd; 261 err = security_file_receive(fp[i]); 262 if (err) 263 break; 264 err = get_unused_fd(); 265 if (err < 0) 266 break; 267 new_fd = err; 268 err = put_user(new_fd, cmfptr); 269 if (err) { 270 put_unused_fd(new_fd); 271 break; 272 } 273 /* Bump the usage count and install the file. */ 274 get_file(fp[i]); 275 fd_install(new_fd, fp[i]); 276 } 277 278 if (i > 0) { 279 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 280 if (!err) 281 err = put_user(SOL_SOCKET, &cm->cmsg_level); 282 if (!err) 283 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 284 if (!err) 285 err = put_user(cmlen, &cm->cmsg_len); 286 if (!err) { 287 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 288 kmsg->msg_control += cmlen; 289 kmsg->msg_controllen -= cmlen; 290 } 291 } 292 if (i < fdnum) 293 kmsg->msg_flags |= MSG_CTRUNC; 294 295 /* 296 * All of the files that fit in the message have had their 297 * usage counts incremented, so we just free the list. 298 */ 299 __scm_destroy(scm); 300} 301 302/* 303 * For now, we assume that the compatibility and native version 304 * of struct ipt_entry are the same - sfr. FIXME 305 */ 306struct compat_ipt_replace { 307 char name[IPT_TABLE_MAXNAMELEN]; 308 u32 valid_hooks; 309 u32 num_entries; 310 u32 size; 311 u32 hook_entry[NF_IP_NUMHOOKS]; 312 u32 underflow[NF_IP_NUMHOOKS]; 313 u32 num_counters; 314 compat_uptr_t counters; /* struct ipt_counters * */ 315 struct ipt_entry entries[0]; 316}; 317 318static int do_netfilter_replace(int fd, int level, int optname, 319 char __user *optval, int optlen) 320{ 321 struct compat_ipt_replace __user *urepl; 322 struct ipt_replace __user *repl_nat; 323 char name[IPT_TABLE_MAXNAMELEN]; 324 u32 origsize, tmp32, num_counters; 325 unsigned int repl_nat_size; 326 int ret; 327 int i; 328 compat_uptr_t ucntrs; 329 330 urepl = (struct compat_ipt_replace __user *)optval; 331 if (get_user(origsize, &urepl->size)) 332 return -EFAULT; 333 334 /* Hack: Causes ipchains to give correct error msg --RR */ 335 if (optlen != sizeof(*urepl) + origsize) 336 return -ENOPROTOOPT; 337 338 /* XXX Assumes that size of ipt_entry is the same both in 339 * native and compat environments. 340 */ 341 repl_nat_size = sizeof(*repl_nat) + origsize; 342 repl_nat = compat_alloc_user_space(repl_nat_size); 343 344 ret = -EFAULT; 345 if (put_user(origsize, &repl_nat->size)) 346 goto out; 347 348 if (!access_ok(VERIFY_READ, urepl, optlen) || 349 !access_ok(VERIFY_WRITE, repl_nat, optlen)) 350 goto out; 351 352 if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) || 353 __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name))) 354 goto out; 355 356 if (__get_user(tmp32, &urepl->valid_hooks) || 357 __put_user(tmp32, &repl_nat->valid_hooks)) 358 goto out; 359 360 if (__get_user(tmp32, &urepl->num_entries) || 361 __put_user(tmp32, &repl_nat->num_entries)) 362 goto out; 363 364 if (__get_user(num_counters, &urepl->num_counters) || 365 __put_user(num_counters, &repl_nat->num_counters)) 366 goto out; 367 368 if (__get_user(ucntrs, &urepl->counters) || 369 __put_user(compat_ptr(ucntrs), &repl_nat->counters)) 370 goto out; 371 372 if (__copy_in_user(&repl_nat->entries[0], 373 &urepl->entries[0], 374 origsize)) 375 goto out; 376 377 for (i = 0; i < NF_IP_NUMHOOKS; i++) { 378 if (__get_user(tmp32, &urepl->hook_entry[i]) || 379 __put_user(tmp32, &repl_nat->hook_entry[i]) || 380 __get_user(tmp32, &urepl->underflow[i]) || 381 __put_user(tmp32, &repl_nat->underflow[i])) 382 goto out; 383 } 384 385 /* 386 * Since struct ipt_counters just contains two u_int64_t members 387 * we can just do the access_ok check here and pass the (converted) 388 * pointer into the standard syscall. We hope that the pointer is 389 * not misaligned ... 390 */ 391 if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs), 392 num_counters * sizeof(struct ipt_counters))) 393 goto out; 394 395 396 ret = sys_setsockopt(fd, level, optname, 397 (char __user *)repl_nat, repl_nat_size); 398 399out: 400 return ret; 401} 402 403/* 404 * A struct sock_filter is architecture independent. 405 */ 406struct compat_sock_fprog { 407 u16 len; 408 compat_uptr_t filter; /* struct sock_filter * */ 409}; 410 411static int do_set_attach_filter(int fd, int level, int optname, 412 char __user *optval, int optlen) 413{ 414 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 415 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 416 compat_uptr_t ptr; 417 u16 len; 418 419 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 420 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 421 __get_user(len, &fprog32->len) || 422 __get_user(ptr, &fprog32->filter) || 423 __put_user(len, &kfprog->len) || 424 __put_user(compat_ptr(ptr), &kfprog->filter)) 425 return -EFAULT; 426 427 return sys_setsockopt(fd, level, optname, (char __user *)kfprog, 428 sizeof(struct sock_fprog)); 429} 430 431static int do_set_sock_timeout(int fd, int level, int optname, char __user *optval, int optlen) 432{ 433 struct compat_timeval __user *up = (struct compat_timeval __user *) optval; 434 struct timeval ktime; 435 mm_segment_t old_fs; 436 int err; 437 438 if (optlen < sizeof(*up)) 439 return -EINVAL; 440 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 441 __get_user(ktime.tv_sec, &up->tv_sec) || 442 __get_user(ktime.tv_usec, &up->tv_usec)) 443 return -EFAULT; 444 old_fs = get_fs(); 445 set_fs(KERNEL_DS); 446 err = sys_setsockopt(fd, level, optname, (char *) &ktime, sizeof(ktime)); 447 set_fs(old_fs); 448 449 return err; 450} 451 452asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 453 char __user *optval, int optlen) 454{ 455 /* SO_SET_REPLACE seems to be the same in all levels */ 456 if (optname == IPT_SO_SET_REPLACE) 457 return do_netfilter_replace(fd, level, optname, 458 optval, optlen); 459 if (level == SOL_SOCKET && optname == SO_ATTACH_FILTER) 460 return do_set_attach_filter(fd, level, optname, 461 optval, optlen); 462 if (level == SOL_SOCKET && 463 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) 464 return do_set_sock_timeout(fd, level, optname, optval, optlen); 465 466 return sys_setsockopt(fd, level, optname, optval, optlen); 467} 468 469static int do_get_sock_timeout(int fd, int level, int optname, 470 char __user *optval, int __user *optlen) 471{ 472 struct compat_timeval __user *up; 473 struct timeval ktime; 474 mm_segment_t old_fs; 475 int len, err; 476 477 up = (struct compat_timeval __user *) optval; 478 if (get_user(len, optlen)) 479 return -EFAULT; 480 if (len < sizeof(*up)) 481 return -EINVAL; 482 len = sizeof(ktime); 483 old_fs = get_fs(); 484 set_fs(KERNEL_DS); 485 err = sys_getsockopt(fd, level, optname, (char *) &ktime, &len); 486 set_fs(old_fs); 487 488 if (!err) { 489 if (put_user(sizeof(*up), optlen) || 490 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 491 __put_user(ktime.tv_sec, &up->tv_sec) || 492 __put_user(ktime.tv_usec, &up->tv_usec)) 493 err = -EFAULT; 494 } 495 return err; 496} 497 498asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 499 char __user *optval, int __user *optlen) 500{ 501 if (level == SOL_SOCKET && 502 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) 503 return do_get_sock_timeout(fd, level, optname, optval, optlen); 504 return sys_getsockopt(fd, level, optname, optval, optlen); 505} 506 507/* Argument list sizes for compat_sys_socketcall */ 508#define AL(x) ((x) * sizeof(u32)) 509static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 510 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 511 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 512#undef AL 513 514asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 515{ 516 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 517} 518 519asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 520{ 521 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 522} 523 524asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 525{ 526 int ret; 527 u32 a[6]; 528 u32 a0, a1; 529 530 if (call < SYS_SOCKET || call > SYS_RECVMSG) 531 return -EINVAL; 532 if (copy_from_user(a, args, nas[call])) 533 return -EFAULT; 534 a0 = a[0]; 535 a1 = a[1]; 536 537 switch(call) { 538 case SYS_SOCKET: 539 ret = sys_socket(a0, a1, a[2]); 540 break; 541 case SYS_BIND: 542 ret = sys_bind(a0, compat_ptr(a1), a[2]); 543 break; 544 case SYS_CONNECT: 545 ret = sys_connect(a0, compat_ptr(a1), a[2]); 546 break; 547 case SYS_LISTEN: 548 ret = sys_listen(a0, a1); 549 break; 550 case SYS_ACCEPT: 551 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2])); 552 break; 553 case SYS_GETSOCKNAME: 554 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 555 break; 556 case SYS_GETPEERNAME: 557 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 558 break; 559 case SYS_SOCKETPAIR: 560 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 561 break; 562 case SYS_SEND: 563 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 564 break; 565 case SYS_SENDTO: 566 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 567 break; 568 case SYS_RECV: 569 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]); 570 break; 571 case SYS_RECVFROM: 572 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5])); 573 break; 574 case SYS_SHUTDOWN: 575 ret = sys_shutdown(a0,a1); 576 break; 577 case SYS_SETSOCKOPT: 578 ret = compat_sys_setsockopt(a0, a1, a[2], 579 compat_ptr(a[3]), a[4]); 580 break; 581 case SYS_GETSOCKOPT: 582 ret = compat_sys_getsockopt(a0, a1, a[2], 583 compat_ptr(a[3]), compat_ptr(a[4])); 584 break; 585 case SYS_SENDMSG: 586 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 587 break; 588 case SYS_RECVMSG: 589 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 590 break; 591 default: 592 ret = -EINVAL; 593 break; 594 } 595 return ret; 596} 597