1/*- 2 * Copyright (c) 1998 Mark Newton 3 * Copyright (c) 1994, 1997 Christos Zoulas. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christos Zoulas. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD$"); 34 35#include <sys/param.h> 36#include <sys/capability.h> 37#include <sys/systm.h> 38#include <sys/file.h> 39#include <sys/filedesc.h> 40/*#include <sys/ioctl.h>*/ 41#include <sys/lock.h> 42#include <sys/malloc.h> 43#include <sys/mount.h> 44#include <sys/mutex.h> 45#include <sys/namei.h> 46#include <sys/priv.h> 47#include <sys/proc.h> 48#include <sys/stat.h> 49#include <sys/syscallsubr.h> 50#include <sys/unistd.h> 51#include <sys/vnode.h> 52 53#include <sys/sysproto.h> 54 55#include <compat/svr4/svr4.h> 56#include <compat/svr4/svr4_types.h> 57#include <compat/svr4/svr4_signal.h> 58#include <compat/svr4/svr4_proto.h> 59#include <compat/svr4/svr4_util.h> 60#include <compat/svr4/svr4_fcntl.h> 61 62#include <security/mac/mac_framework.h> 63 64static int svr4_to_bsd_flags(int); 65static u_long svr4_to_bsd_cmd(u_long); 66static int fd_revoke(struct thread *, int); 67static int fd_truncate(struct thread *, int, struct flock *); 68static int bsd_to_svr4_flags(int); 69static void bsd_to_svr4_flock(struct flock *, struct svr4_flock *); 70static void svr4_to_bsd_flock(struct svr4_flock *, struct flock *); 71static void bsd_to_svr4_flock64(struct flock *, struct svr4_flock64 *); 72static void svr4_to_bsd_flock64(struct svr4_flock64 *, struct flock *); 73 74static u_long 75svr4_to_bsd_cmd(cmd) 76 u_long cmd; 77{ 78 switch (cmd) { 79 case SVR4_F_DUPFD: 80 return F_DUPFD; 81 case SVR4_F_DUP2FD: 82 return F_DUP2FD; 83 case SVR4_F_GETFD: 84 return F_GETFD; 85 case SVR4_F_SETFD: 86 return F_SETFD; 87 case SVR4_F_GETFL: 88 return F_GETFL; 89 case SVR4_F_SETFL: 90 return F_SETFL; 91 case SVR4_F_GETLK: 92 return F_GETLK; 93 case SVR4_F_SETLK: 94 return F_SETLK; 95 case SVR4_F_SETLKW: 96 return F_SETLKW; 97 default: 98 return -1; 99 } 100} 101 102static int 103svr4_to_bsd_flags(l) 104 int l; 105{ 106 int r = 0; 107 r |= (l & SVR4_O_RDONLY) ? O_RDONLY : 0; 108 r |= (l & SVR4_O_WRONLY) ? O_WRONLY : 0; 109 r |= (l & SVR4_O_RDWR) ? O_RDWR : 0; 110 r |= (l & SVR4_O_NDELAY) ? O_NONBLOCK : 0; 111 r |= (l & SVR4_O_APPEND) ? O_APPEND : 0; 112 r |= (l & SVR4_O_SYNC) ? O_FSYNC : 0; 113 r |= (l & SVR4_O_NONBLOCK) ? O_NONBLOCK : 0; 114 r |= (l & SVR4_O_PRIV) ? O_EXLOCK : 0; 115 r |= (l & SVR4_O_CREAT) ? O_CREAT : 0; 116 r |= (l & SVR4_O_TRUNC) ? O_TRUNC : 0; 117 r |= (l & SVR4_O_EXCL) ? O_EXCL : 0; 118 r |= (l & SVR4_O_NOCTTY) ? O_NOCTTY : 0; 119 return r; 120} 121 122static int 123bsd_to_svr4_flags(l) 124 int l; 125{ 126 int r = 0; 127 r |= (l & O_RDONLY) ? SVR4_O_RDONLY : 0; 128 r |= (l & O_WRONLY) ? SVR4_O_WRONLY : 0; 129 r |= (l & O_RDWR) ? SVR4_O_RDWR : 0; 130 r |= (l & O_NDELAY) ? SVR4_O_NONBLOCK : 0; 131 r |= (l & O_APPEND) ? SVR4_O_APPEND : 0; 132 r |= (l & O_FSYNC) ? SVR4_O_SYNC : 0; 133 r |= (l & O_NONBLOCK) ? SVR4_O_NONBLOCK : 0; 134 r |= (l & O_EXLOCK) ? SVR4_O_PRIV : 0; 135 r |= (l & O_CREAT) ? SVR4_O_CREAT : 0; 136 r |= (l & O_TRUNC) ? SVR4_O_TRUNC : 0; 137 r |= (l & O_EXCL) ? SVR4_O_EXCL : 0; 138 r |= (l & O_NOCTTY) ? SVR4_O_NOCTTY : 0; 139 return r; 140} 141 142 143static void 144bsd_to_svr4_flock(iflp, oflp) 145 struct flock *iflp; 146 struct svr4_flock *oflp; 147{ 148 switch (iflp->l_type) { 149 case F_RDLCK: 150 oflp->l_type = SVR4_F_RDLCK; 151 break; 152 case F_WRLCK: 153 oflp->l_type = SVR4_F_WRLCK; 154 break; 155 case F_UNLCK: 156 oflp->l_type = SVR4_F_UNLCK; 157 break; 158 default: 159 oflp->l_type = -1; 160 break; 161 } 162 163 oflp->l_whence = (short) iflp->l_whence; 164 oflp->l_start = (svr4_off_t) iflp->l_start; 165 oflp->l_len = (svr4_off_t) iflp->l_len; 166 oflp->l_sysid = 0; 167 oflp->l_pid = (svr4_pid_t) iflp->l_pid; 168} 169 170 171static void 172svr4_to_bsd_flock(iflp, oflp) 173 struct svr4_flock *iflp; 174 struct flock *oflp; 175{ 176 switch (iflp->l_type) { 177 case SVR4_F_RDLCK: 178 oflp->l_type = F_RDLCK; 179 break; 180 case SVR4_F_WRLCK: 181 oflp->l_type = F_WRLCK; 182 break; 183 case SVR4_F_UNLCK: 184 oflp->l_type = F_UNLCK; 185 break; 186 default: 187 oflp->l_type = -1; 188 break; 189 } 190 191 oflp->l_whence = iflp->l_whence; 192 oflp->l_start = (off_t) iflp->l_start; 193 oflp->l_len = (off_t) iflp->l_len; 194 oflp->l_pid = (pid_t) iflp->l_pid; 195 oflp->l_sysid = iflp->l_sysid; 196} 197 198static void 199bsd_to_svr4_flock64(iflp, oflp) 200 struct flock *iflp; 201 struct svr4_flock64 *oflp; 202{ 203 switch (iflp->l_type) { 204 case F_RDLCK: 205 oflp->l_type = SVR4_F_RDLCK; 206 break; 207 case F_WRLCK: 208 oflp->l_type = SVR4_F_WRLCK; 209 break; 210 case F_UNLCK: 211 oflp->l_type = SVR4_F_UNLCK; 212 break; 213 default: 214 oflp->l_type = -1; 215 break; 216 } 217 218 oflp->l_whence = (short) iflp->l_whence; 219 oflp->l_start = (svr4_off64_t) iflp->l_start; 220 oflp->l_len = (svr4_off64_t) iflp->l_len; 221 oflp->l_sysid = iflp->l_sysid; 222 oflp->l_pid = (svr4_pid_t) iflp->l_pid; 223} 224 225 226static void 227svr4_to_bsd_flock64(iflp, oflp) 228 struct svr4_flock64 *iflp; 229 struct flock *oflp; 230{ 231 switch (iflp->l_type) { 232 case SVR4_F_RDLCK: 233 oflp->l_type = F_RDLCK; 234 break; 235 case SVR4_F_WRLCK: 236 oflp->l_type = F_WRLCK; 237 break; 238 case SVR4_F_UNLCK: 239 oflp->l_type = F_UNLCK; 240 break; 241 default: 242 oflp->l_type = -1; 243 break; 244 } 245 246 oflp->l_whence = iflp->l_whence; 247 oflp->l_start = (off_t) iflp->l_start; 248 oflp->l_len = (off_t) iflp->l_len; 249 oflp->l_pid = (pid_t) iflp->l_pid; 250 251} 252 253 254static int 255fd_revoke(td, fd) 256 struct thread *td; 257 int fd; 258{ 259 struct vnode *vp; 260 struct mount *mp; 261 struct vattr vattr; 262 int error, *retval; 263 264 retval = td->td_retval; 265 /* 266 * If we ever want to support Capsicum on SVR4 processes (unlikely) 267 * or FreeBSD grows a native frevoke() (more likely), we will need a 268 * CAP_REVOKE here. 269 * 270 * In the meantime, use CAP_MASK_VALID: if a SVR4 process wants to 271 * do an frevoke(), it needs to do it on either a regular file 272 * descriptor or a fully-privileged capability (which is effectively 273 * the same as a non-capability-restricted file descriptor). 274 */ 275 if ((error = fgetvp(td, fd, CAP_MASK_VALID, &vp)) != 0) 276 return (error); 277 278 if (vp->v_type != VCHR && vp->v_type != VBLK) { 279 error = EINVAL; 280 goto out; 281 } 282 283#ifdef MAC 284 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 285 error = mac_vnode_check_revoke(td->td_ucred, vp); 286 VOP_UNLOCK(vp, 0); 287 if (error) 288 goto out; 289#endif 290 291 if ((error = VOP_GETATTR(vp, &vattr, td->td_ucred)) != 0) 292 goto out; 293 294 if (td->td_ucred->cr_uid != vattr.va_uid && 295 (error = priv_check(td, PRIV_VFS_ADMIN)) != 0) 296 goto out; 297 298 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 299 goto out; 300 if (vcount(vp) > 1) 301 VOP_REVOKE(vp, REVOKEALL); 302 vn_finished_write(mp); 303out: 304 vrele(vp); 305 return error; 306} 307 308 309static int 310fd_truncate(td, fd, flp) 311 struct thread *td; 312 int fd; 313 struct flock *flp; 314{ 315 off_t start, length; 316 struct file *fp; 317 struct vnode *vp; 318 struct vattr vattr; 319 int error, *retval; 320 struct ftruncate_args ft; 321 322 retval = td->td_retval; 323 324 /* 325 * We only support truncating the file. 326 */ 327 if ((error = fget(td, fd, CAP_FTRUNCATE, &fp)) != 0) 328 return (error); 329 330 vp = fp->f_vnode; 331 332 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 333 fdrop(fp, td); 334 return ESPIPE; 335 } 336 337 if ((error = VOP_GETATTR(vp, &vattr, td->td_ucred)) != 0) { 338 fdrop(fp, td); 339 return error; 340 } 341 342 length = vattr.va_size; 343 344 switch (flp->l_whence) { 345 case SEEK_CUR: 346 start = fp->f_offset + flp->l_start; 347 break; 348 349 case SEEK_END: 350 start = flp->l_start + length; 351 break; 352 353 case SEEK_SET: 354 start = flp->l_start; 355 break; 356 357 default: 358 fdrop(fp, td); 359 return EINVAL; 360 } 361 362 if (start + flp->l_len < length) { 363 /* We don't support free'ing in the middle of the file */ 364 fdrop(fp, td); 365 return EINVAL; 366 } 367 368 ft.fd = fd; 369 ft.length = start; 370 371 error = sys_ftruncate(td, &ft); 372 373 fdrop(fp, td); 374 return (error); 375} 376 377int 378svr4_sys_open(td, uap) 379 struct thread *td; 380 struct svr4_sys_open_args *uap; 381{ 382 struct proc *p = td->td_proc; 383 char *newpath; 384 int bsd_flags, error, retval; 385 386 CHECKALTEXIST(td, uap->path, &newpath); 387 388 bsd_flags = svr4_to_bsd_flags(uap->flags); 389 error = kern_open(td, newpath, UIO_SYSSPACE, bsd_flags, uap->mode); 390 free(newpath, M_TEMP); 391 392 if (error) { 393 /* uprintf("svr4_open(%s, 0x%0x, 0%o): %d\n", uap->path, 394 uap->flags, uap->mode, error);*/ 395 return error; 396 } 397 398 retval = td->td_retval[0]; 399 400 PROC_LOCK(p); 401 if (!(bsd_flags & O_NOCTTY) && SESS_LEADER(p) && 402 !(p->p_flag & P_CONTROLT)) { 403#if defined(NOTYET) 404 struct file *fp; 405 406 error = fget(td, retval, CAP_IOCTL, &fp); 407 PROC_UNLOCK(p); 408 /* 409 * we may have lost a race the above open() and 410 * another thread issuing a close() 411 */ 412 if (error) 413 return (EBADF); /* XXX: correct errno? */ 414 /* ignore any error, just give it a try */ 415 if (fp->f_type == DTYPE_VNODE) 416 fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0, td->td_ucred, 417 td); 418 fdrop(fp, td); 419 } else { 420 PROC_UNLOCK(p); 421 } 422#else 423 } 424 PROC_UNLOCK(p); 425#endif 426 return error; 427} 428 429int 430svr4_sys_open64(td, uap) 431 struct thread *td; 432 struct svr4_sys_open64_args *uap; 433{ 434 return svr4_sys_open(td, (struct svr4_sys_open_args *)uap); 435} 436 437int 438svr4_sys_creat(td, uap) 439 struct thread *td; 440 struct svr4_sys_creat_args *uap; 441{ 442 char *newpath; 443 int error; 444 445 CHECKALTEXIST(td, uap->path, &newpath); 446 447 error = kern_open(td, newpath, UIO_SYSSPACE, O_WRONLY | O_CREAT | 448 O_TRUNC, uap->mode); 449 free(newpath, M_TEMP); 450 return (error); 451} 452 453int 454svr4_sys_creat64(td, uap) 455 struct thread *td; 456 struct svr4_sys_creat64_args *uap; 457{ 458 return svr4_sys_creat(td, (struct svr4_sys_creat_args *)uap); 459} 460 461int 462svr4_sys_llseek(td, uap) 463 struct thread *td; 464 struct svr4_sys_llseek_args *uap; 465{ 466 struct lseek_args ap; 467 468 ap.fd = uap->fd; 469 470#if BYTE_ORDER == BIG_ENDIAN 471 ap.offset = (((u_int64_t) uap->offset1) << 32) | 472 uap->offset2; 473#else 474 ap.offset = (((u_int64_t) uap->offset2) << 32) | 475 uap->offset1; 476#endif 477 ap.whence = uap->whence; 478 479 return sys_lseek(td, &ap); 480} 481 482int 483svr4_sys_access(td, uap) 484 struct thread *td; 485 struct svr4_sys_access_args *uap; 486{ 487 char *newpath; 488 int error; 489 490 CHECKALTEXIST(td, uap->path, &newpath); 491 error = kern_access(td, newpath, UIO_SYSSPACE, uap->flags); 492 free(newpath, M_TEMP); 493 return (error); 494} 495 496#if defined(NOTYET) 497int 498svr4_sys_pread(td, uap) 499 struct thread *td; 500 struct svr4_sys_pread_args *uap; 501{ 502 struct pread_args pra; 503 504 /* 505 * Just translate the args structure and call the NetBSD 506 * pread(2) system call (offset type is 64-bit in NetBSD). 507 */ 508 pra.fd = uap->fd; 509 pra.buf = uap->buf; 510 pra.nbyte = uap->nbyte; 511 pra.offset = uap->off; 512 513 return pread(td, &pra); 514} 515#endif 516 517#if defined(NOTYET) 518int 519svr4_sys_pread64(td, v, retval) 520 struct thread *td; 521 void *v; 522 register_t *retval; 523{ 524 525 struct svr4_sys_pread64_args *uap = v; 526 struct sys_pread_args pra; 527 528 /* 529 * Just translate the args structure and call the NetBSD 530 * pread(2) system call (offset type is 64-bit in NetBSD). 531 */ 532 pra.fd = uap->fd; 533 pra.buf = uap->buf; 534 pra.nbyte = uap->nbyte; 535 pra.offset = uap->off; 536 537 return (sys_pread(td, &pra, retval)); 538} 539#endif /* NOTYET */ 540 541#if defined(NOTYET) 542int 543svr4_sys_pwrite(td, uap) 544 struct thread *td; 545 struct svr4_sys_pwrite_args *uap; 546{ 547 struct pwrite_args pwa; 548 549 /* 550 * Just translate the args structure and call the NetBSD 551 * pwrite(2) system call (offset type is 64-bit in NetBSD). 552 */ 553 pwa.fd = uap->fd; 554 pwa.buf = uap->buf; 555 pwa.nbyte = uap->nbyte; 556 pwa.offset = uap->off; 557 558 return pwrite(td, &pwa); 559} 560#endif 561 562#if defined(NOTYET) 563int 564svr4_sys_pwrite64(td, v, retval) 565 struct thread *td; 566 void *v; 567 register_t *retval; 568{ 569 struct svr4_sys_pwrite64_args *uap = v; 570 struct sys_pwrite_args pwa; 571 572 /* 573 * Just translate the args structure and call the NetBSD 574 * pwrite(2) system call (offset type is 64-bit in NetBSD). 575 */ 576 pwa.fd = uap->fd; 577 pwa.buf = uap->buf; 578 pwa.nbyte = uap->nbyte; 579 pwa.offset = uap->off; 580 581 return (sys_pwrite(td, &pwa, retval)); 582} 583#endif /* NOTYET */ 584 585int 586svr4_sys_fcntl(td, uap) 587 struct thread *td; 588 struct svr4_sys_fcntl_args *uap; 589{ 590 int cmd, error, *retval; 591 592 retval = td->td_retval; 593 594 cmd = svr4_to_bsd_cmd(uap->cmd); 595 596 switch (cmd) { 597 case F_DUPFD: 598 case F_DUP2FD: 599 case F_GETFD: 600 case F_SETFD: 601 return (kern_fcntl(td, uap->fd, cmd, (intptr_t)uap->arg)); 602 603 case F_GETFL: 604 error = kern_fcntl(td, uap->fd, cmd, (intptr_t)uap->arg); 605 if (error) 606 return (error); 607 *retval = bsd_to_svr4_flags(*retval); 608 return (error); 609 610 case F_SETFL: 611 { 612 /* 613 * we must save the O_ASYNC flag, as that is 614 * handled by ioctl(_, I_SETSIG, _) emulation. 615 */ 616 int flags; 617 618 DPRINTF(("Setting flags %p\n", uap->arg)); 619 620 error = kern_fcntl(td, uap->fd, F_GETFL, 0); 621 if (error) 622 return (error); 623 flags = *retval; 624 flags &= O_ASYNC; 625 flags |= svr4_to_bsd_flags((u_long) uap->arg); 626 return (kern_fcntl(td, uap->fd, F_SETFL, flags)); 627 } 628 629 case F_GETLK: 630 case F_SETLK: 631 case F_SETLKW: 632 { 633 struct svr4_flock ifl; 634 struct flock fl; 635 636 error = copyin(uap->arg, &ifl, sizeof (ifl)); 637 if (error) 638 return (error); 639 640 svr4_to_bsd_flock(&ifl, &fl); 641 642 error = kern_fcntl(td, uap->fd, cmd, (intptr_t)&fl); 643 if (error || cmd != F_GETLK) 644 return (error); 645 646 bsd_to_svr4_flock(&fl, &ifl); 647 648 return (copyout(&ifl, uap->arg, sizeof (ifl))); 649 } 650 case -1: 651 switch (uap->cmd) { 652 case SVR4_F_FREESP: 653 { 654 struct svr4_flock ifl; 655 struct flock fl; 656 657 error = copyin(uap->arg, &ifl, 658 sizeof ifl); 659 if (error) 660 return error; 661 svr4_to_bsd_flock(&ifl, &fl); 662 return fd_truncate(td, uap->fd, &fl); 663 } 664 665 case SVR4_F_GETLK64: 666 case SVR4_F_SETLK64: 667 case SVR4_F_SETLKW64: 668 { 669 struct svr4_flock64 ifl; 670 struct flock fl; 671 672 switch (uap->cmd) { 673 case SVR4_F_GETLK64: 674 cmd = F_GETLK; 675 break; 676 case SVR4_F_SETLK64: 677 cmd = F_SETLK; 678 break; 679 case SVR4_F_SETLKW64: 680 cmd = F_SETLKW; 681 break; 682 } 683 error = copyin(uap->arg, &ifl, 684 sizeof (ifl)); 685 if (error) 686 return (error); 687 688 svr4_to_bsd_flock64(&ifl, &fl); 689 690 error = kern_fcntl(td, uap->fd, cmd, 691 (intptr_t)&fl); 692 if (error || cmd != F_GETLK) 693 return (error); 694 695 bsd_to_svr4_flock64(&fl, &ifl); 696 697 return (copyout(&ifl, uap->arg, 698 sizeof (ifl))); 699 } 700 701 case SVR4_F_FREESP64: 702 { 703 struct svr4_flock64 ifl; 704 struct flock fl; 705 706 error = copyin(uap->arg, &ifl, 707 sizeof ifl); 708 if (error) 709 return error; 710 svr4_to_bsd_flock64(&ifl, &fl); 711 return fd_truncate(td, uap->fd, &fl); 712 } 713 714 case SVR4_F_REVOKE: 715 return fd_revoke(td, uap->fd); 716 717 default: 718 return ENOSYS; 719 } 720 721 default: 722 return ENOSYS; 723 } 724} 725