1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "opt_compat.h" 41 #include "opt_mac.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/bio.h> 46 #include <sys/buf.h> 47 #include <sys/sysent.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mutex.h> 51 #include <sys/sysproto.h> 52 #include <sys/namei.h> 53 #include <sys/filedesc.h> 54 #include <sys/kernel.h> 55 #include <sys/fcntl.h> 56 #include <sys/file.h> 57 #include <sys/filio.h> 58 #include <sys/limits.h> 59 #include <sys/linker.h> 60 #include <sys/stat.h> 61 #include <sys/sx.h> 62 #include <sys/unistd.h> 63 #include <sys/vnode.h> 64 #include <sys/priv.h> 65 #include <sys/proc.h> 66 #include <sys/dirent.h> 67 #include <sys/jail.h> 68 #include <sys/syscallsubr.h> 69 #include <sys/sysctl.h> 70 71 #include <machine/stdarg.h> 72 73 #include <security/audit/audit.h> 74 #include <security/mac/mac_framework.h> 75 76 #include <vm/vm.h> 77 #include <vm/vm_object.h> 78 #include <vm/vm_page.h> 79 #include <vm/uma.h> 80 81 static int chroot_refuse_vdir_fds(struct filedesc *fdp); 82 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 83 static int setfown(struct thread *td, struct vnode *, uid_t, gid_t); 84 static int setfmode(struct thread *td, struct vnode *, int); 85 static int setfflags(struct thread *td, struct vnode *, int); 86 static int setutimes(struct thread *td, struct vnode *, 87 const struct timespec *, int, int); 88 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 89 struct thread *td); 90 91 /* 92 * The module initialization routine for POSIX asynchronous I/O will 93 * set this to the version of AIO that it implements. (Zero means 94 * that it is not implemented.) This value is used here by pathconf() 95 * and in kern_descrip.c by fpathconf(). 96 */ 97 int async_io_version; 98 99 #ifdef DEBUG 100 static int syncprt = 0; 101 SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); 102 #endif 103 104 /* 105 * Sync each mounted filesystem. 106 */ 107 #ifndef _SYS_SYSPROTO_H_ 108 struct sync_args { 109 int dummy; 110 }; 111 #endif 112 /* ARGSUSED */ 113 int 114 sync(td, uap) 115 struct thread *td; 116 struct sync_args *uap; 117 { 118 struct mount *mp, *nmp; 119 int vfslocked; 120 121 mtx_lock(&mountlist_mtx); 122 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 123 if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) { 124 nmp = TAILQ_NEXT(mp, mnt_list); 125 continue; 126 } 127 vfslocked = VFS_LOCK_GIANT(mp); 128 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 129 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 130 MNT_ILOCK(mp); 131 mp->mnt_noasync++; 132 mp->mnt_kern_flag &= ~MNTK_ASYNC; 133 MNT_IUNLOCK(mp); 134 vfs_msync(mp, MNT_NOWAIT); 135 VFS_SYNC(mp, MNT_NOWAIT, td); 136 MNT_ILOCK(mp); 137 mp->mnt_noasync--; 138 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 139 mp->mnt_noasync == 0) 140 mp->mnt_kern_flag |= MNTK_ASYNC; 141 MNT_IUNLOCK(mp); 142 vn_finished_write(mp); 143 } 144 VFS_UNLOCK_GIANT(vfslocked); 145 mtx_lock(&mountlist_mtx); 146 nmp = TAILQ_NEXT(mp, mnt_list); 147 vfs_unbusy(mp, td); 148 } 149 mtx_unlock(&mountlist_mtx); 150 return (0); 151 } 152 153 /* XXX PRISON: could be per prison flag */ 154 static int prison_quotas; 155 #if 0 156 SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, ""); 157 #endif 158 159 /* 160 * Change filesystem quotas. 161 */ 162 #ifndef _SYS_SYSPROTO_H_ 163 struct quotactl_args { 164 char *path; 165 int cmd; 166 int uid; 167 caddr_t arg; 168 }; 169 #endif 170 int 171 quotactl(td, uap) 172 struct thread *td; 173 register struct quotactl_args /* { 174 char *path; 175 int cmd; 176 int uid; 177 caddr_t arg; 178 } */ *uap; 179 { 180 struct mount *mp; 181 int vfslocked; 182 int error; 183 struct nameidata nd; 184 185 AUDIT_ARG(cmd, uap->cmd); 186 AUDIT_ARG(uid, uap->uid); 187 if (jailed(td->td_ucred) && !prison_quotas) 188 return (EPERM); 189 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, 190 UIO_USERSPACE, uap->path, td); 191 if ((error = namei(&nd)) != 0) 192 return (error); 193 vfslocked = NDHASGIANT(&nd); 194 NDFREE(&nd, NDF_ONLY_PNBUF); 195 mp = nd.ni_vp->v_mount; 196 if ((error = vfs_busy(mp, 0, NULL, td))) { 197 vrele(nd.ni_vp); 198 VFS_UNLOCK_GIANT(vfslocked); 199 return (error); 200 } 201 vrele(nd.ni_vp); 202 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, td); 203 vfs_unbusy(mp, td); 204 VFS_UNLOCK_GIANT(vfslocked); 205 return (error); 206 } 207 208 /* 209 * Used by statfs conversion routines to scale the block size up if 210 * necessary so that all of the block counts are <= 'max_size'. Note 211 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 212 * value of 'n'. 213 */ 214 void 215 statfs_scale_blocks(struct statfs *sf, long max_size) 216 { 217 uint64_t count; 218 int shift; 219 220 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 221 222 /* 223 * Attempt to scale the block counts to give a more accurate 224 * overview to userland of the ratio of free space to used 225 * space. To do this, find the largest block count and compute 226 * a divisor that lets it fit into a signed integer <= max_size. 227 */ 228 if (sf->f_bavail < 0) 229 count = -sf->f_bavail; 230 else 231 count = sf->f_bavail; 232 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 233 if (count <= max_size) 234 return; 235 236 count >>= flsl(max_size); 237 shift = 0; 238 while (count > 0) { 239 shift++; 240 count >>=1; 241 } 242 243 sf->f_bsize <<= shift; 244 sf->f_blocks >>= shift; 245 sf->f_bfree >>= shift; 246 sf->f_bavail >>= shift; 247 } 248 249 /* 250 * Get filesystem statistics. 251 */ 252 #ifndef _SYS_SYSPROTO_H_ 253 struct statfs_args { 254 char *path; 255 struct statfs *buf; 256 }; 257 #endif 258 int 259 statfs(td, uap) 260 struct thread *td; 261 register struct statfs_args /* { 262 char *path; 263 struct statfs *buf; 264 } */ *uap; 265 { 266 struct statfs sf; 267 int error; 268 269 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf); 270 if (error == 0) 271 error = copyout(&sf, uap->buf, sizeof(sf)); 272 return (error); 273 } 274 275 int 276 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg, 277 struct statfs *buf) 278 { 279 struct mount *mp; 280 struct statfs *sp, sb; 281 int vfslocked; 282 int error; 283 struct nameidata nd; 284 285 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 286 pathseg, path, td); 287 error = namei(&nd); 288 if (error) 289 return (error); 290 vfslocked = NDHASGIANT(&nd); 291 mp = nd.ni_vp->v_mount; 292 vfs_ref(mp); 293 NDFREE(&nd, NDF_ONLY_PNBUF); 294 vput(nd.ni_vp); 295 #ifdef MAC 296 error = mac_mount_check_stat(td->td_ucred, mp); 297 if (error) 298 goto out; 299 #endif 300 /* 301 * Set these in case the underlying filesystem fails to do so. 302 */ 303 sp = &mp->mnt_stat; 304 sp->f_version = STATFS_VERSION; 305 sp->f_namemax = NAME_MAX; 306 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 307 error = VFS_STATFS(mp, sp, td); 308 if (error) 309 goto out; 310 if (priv_check(td, PRIV_VFS_GENERATION)) { 311 bcopy(sp, &sb, sizeof(sb)); 312 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 313 prison_enforce_statfs(td->td_ucred, mp, &sb); 314 sp = &sb; 315 } 316 *buf = *sp; 317 out: 318 vfs_rel(mp); 319 VFS_UNLOCK_GIANT(vfslocked); 320 if (mtx_owned(&Giant)) 321 printf("statfs(%d): %s: %d\n", vfslocked, path, error); 322 return (error); 323 } 324 325 /* 326 * Get filesystem statistics. 327 */ 328 #ifndef _SYS_SYSPROTO_H_ 329 struct fstatfs_args { 330 int fd; 331 struct statfs *buf; 332 }; 333 #endif 334 int 335 fstatfs(td, uap) 336 struct thread *td; 337 register struct fstatfs_args /* { 338 int fd; 339 struct statfs *buf; 340 } */ *uap; 341 { 342 struct statfs sf; 343 int error; 344 345 error = kern_fstatfs(td, uap->fd, &sf); 346 if (error == 0) 347 error = copyout(&sf, uap->buf, sizeof(sf)); 348 return (error); 349 } 350 351 int 352 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 353 { 354 struct file *fp; 355 struct mount *mp; 356 struct statfs *sp, sb; 357 int vfslocked; 358 struct vnode *vp; 359 int error; 360 361 AUDIT_ARG(fd, fd); 362 error = getvnode(td->td_proc->p_fd, fd, &fp); 363 if (error) 364 return (error); 365 vp = fp->f_vnode; 366 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 367 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 368 #ifdef AUDIT 369 AUDIT_ARG(vnode, vp, ARG_VNODE1); 370 #endif 371 mp = vp->v_mount; 372 if (mp) 373 vfs_ref(mp); 374 VOP_UNLOCK(vp, 0); 375 fdrop(fp, td); 376 if (vp->v_iflag & VI_DOOMED) { 377 error = EBADF; 378 goto out; 379 } 380 #ifdef MAC 381 error = mac_mount_check_stat(td->td_ucred, mp); 382 if (error) 383 goto out; 384 #endif 385 /* 386 * Set these in case the underlying filesystem fails to do so. 387 */ 388 sp = &mp->mnt_stat; 389 sp->f_version = STATFS_VERSION; 390 sp->f_namemax = NAME_MAX; 391 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 392 error = VFS_STATFS(mp, sp, td); 393 if (error) 394 goto out; 395 if (priv_check(td, PRIV_VFS_GENERATION)) { 396 bcopy(sp, &sb, sizeof(sb)); 397 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 398 prison_enforce_statfs(td->td_ucred, mp, &sb); 399 sp = &sb; 400 } 401 *buf = *sp; 402 out: 403 if (mp) 404 vfs_rel(mp); 405 VFS_UNLOCK_GIANT(vfslocked); 406 return (error); 407 } 408 409 /* 410 * Get statistics on all filesystems. 411 */ 412 #ifndef _SYS_SYSPROTO_H_ 413 struct getfsstat_args { 414 struct statfs *buf; 415 long bufsize; 416 int flags; 417 }; 418 #endif 419 int 420 getfsstat(td, uap) 421 struct thread *td; 422 register struct getfsstat_args /* { 423 struct statfs *buf; 424 long bufsize; 425 int flags; 426 } */ *uap; 427 { 428 429 return (kern_getfsstat(td, &uap->buf, uap->bufsize, UIO_USERSPACE, 430 uap->flags)); 431 } 432 433 /* 434 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 435 * The caller is responsible for freeing memory which will be allocated 436 * in '*buf'. 437 */ 438 int 439 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 440 enum uio_seg bufseg, int flags) 441 { 442 struct mount *mp, *nmp; 443 struct statfs *sfsp, *sp, sb; 444 size_t count, maxcount; 445 int vfslocked; 446 int error; 447 448 maxcount = bufsize / sizeof(struct statfs); 449 if (bufsize == 0) 450 sfsp = NULL; 451 else if (bufseg == UIO_USERSPACE) 452 sfsp = *buf; 453 else /* if (bufseg == UIO_SYSSPACE) */ { 454 count = 0; 455 mtx_lock(&mountlist_mtx); 456 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 457 count++; 458 } 459 mtx_unlock(&mountlist_mtx); 460 if (maxcount > count) 461 maxcount = count; 462 sfsp = *buf = malloc(maxcount * sizeof(struct statfs), M_TEMP, 463 M_WAITOK); 464 } 465 count = 0; 466 mtx_lock(&mountlist_mtx); 467 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 468 if (prison_canseemount(td->td_ucred, mp) != 0) { 469 nmp = TAILQ_NEXT(mp, mnt_list); 470 continue; 471 } 472 #ifdef MAC 473 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 474 nmp = TAILQ_NEXT(mp, mnt_list); 475 continue; 476 } 477 #endif 478 if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) { 479 nmp = TAILQ_NEXT(mp, mnt_list); 480 continue; 481 } 482 vfslocked = VFS_LOCK_GIANT(mp); 483 if (sfsp && count < maxcount) { 484 sp = &mp->mnt_stat; 485 /* 486 * Set these in case the underlying filesystem 487 * fails to do so. 488 */ 489 sp->f_version = STATFS_VERSION; 490 sp->f_namemax = NAME_MAX; 491 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 492 /* 493 * If MNT_NOWAIT or MNT_LAZY is specified, do not 494 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY 495 * overrides MNT_WAIT. 496 */ 497 if (((flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || 498 (flags & MNT_WAIT)) && 499 (error = VFS_STATFS(mp, sp, td))) { 500 VFS_UNLOCK_GIANT(vfslocked); 501 mtx_lock(&mountlist_mtx); 502 nmp = TAILQ_NEXT(mp, mnt_list); 503 vfs_unbusy(mp, td); 504 continue; 505 } 506 if (priv_check(td, PRIV_VFS_GENERATION)) { 507 bcopy(sp, &sb, sizeof(sb)); 508 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 509 prison_enforce_statfs(td->td_ucred, mp, &sb); 510 sp = &sb; 511 } 512 if (bufseg == UIO_SYSSPACE) 513 bcopy(sp, sfsp, sizeof(*sp)); 514 else /* if (bufseg == UIO_USERSPACE) */ { 515 error = copyout(sp, sfsp, sizeof(*sp)); 516 if (error) { 517 vfs_unbusy(mp, td); 518 VFS_UNLOCK_GIANT(vfslocked); 519 return (error); 520 } 521 } 522 sfsp++; 523 } 524 VFS_UNLOCK_GIANT(vfslocked); 525 count++; 526 mtx_lock(&mountlist_mtx); 527 nmp = TAILQ_NEXT(mp, mnt_list); 528 vfs_unbusy(mp, td); 529 } 530 mtx_unlock(&mountlist_mtx); 531 if (sfsp && count > maxcount) 532 td->td_retval[0] = maxcount; 533 else 534 td->td_retval[0] = count; 535 return (0); 536 } 537 538 #ifdef COMPAT_FREEBSD4 539 /* 540 * Get old format filesystem statistics. 541 */ 542 static void cvtstatfs(struct statfs *, struct ostatfs *); 543 544 #ifndef _SYS_SYSPROTO_H_ 545 struct freebsd4_statfs_args { 546 char *path; 547 struct ostatfs *buf; 548 }; 549 #endif 550 int 551 freebsd4_statfs(td, uap) 552 struct thread *td; 553 struct freebsd4_statfs_args /* { 554 char *path; 555 struct ostatfs *buf; 556 } */ *uap; 557 { 558 struct ostatfs osb; 559 struct statfs sf; 560 int error; 561 562 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf); 563 if (error) 564 return (error); 565 cvtstatfs(&sf, &osb); 566 return (copyout(&osb, uap->buf, sizeof(osb))); 567 } 568 569 /* 570 * Get filesystem statistics. 571 */ 572 #ifndef _SYS_SYSPROTO_H_ 573 struct freebsd4_fstatfs_args { 574 int fd; 575 struct ostatfs *buf; 576 }; 577 #endif 578 int 579 freebsd4_fstatfs(td, uap) 580 struct thread *td; 581 struct freebsd4_fstatfs_args /* { 582 int fd; 583 struct ostatfs *buf; 584 } */ *uap; 585 { 586 struct ostatfs osb; 587 struct statfs sf; 588 int error; 589 590 error = kern_fstatfs(td, uap->fd, &sf); 591 if (error) 592 return (error); 593 cvtstatfs(&sf, &osb); 594 return (copyout(&osb, uap->buf, sizeof(osb))); 595 } 596 597 /* 598 * Get statistics on all filesystems. 599 */ 600 #ifndef _SYS_SYSPROTO_H_ 601 struct freebsd4_getfsstat_args { 602 struct ostatfs *buf; 603 long bufsize; 604 int flags; 605 }; 606 #endif 607 int 608 freebsd4_getfsstat(td, uap) 609 struct thread *td; 610 register struct freebsd4_getfsstat_args /* { 611 struct ostatfs *buf; 612 long bufsize; 613 int flags; 614 } */ *uap; 615 { 616 struct statfs *buf, *sp; 617 struct ostatfs osb; 618 size_t count, size; 619 int error; 620 621 count = uap->bufsize / sizeof(struct ostatfs); 622 size = count * sizeof(struct statfs); 623 error = kern_getfsstat(td, &buf, size, UIO_SYSSPACE, uap->flags); 624 if (size > 0) { 625 count = td->td_retval[0]; 626 sp = buf; 627 while (count > 0 && error == 0) { 628 cvtstatfs(sp, &osb); 629 error = copyout(&osb, uap->buf, sizeof(osb)); 630 sp++; 631 uap->buf++; 632 count--; 633 } 634 free(buf, M_TEMP); 635 } 636 return (error); 637 } 638 639 /* 640 * Implement fstatfs() for (NFS) file handles. 641 */ 642 #ifndef _SYS_SYSPROTO_H_ 643 struct freebsd4_fhstatfs_args { 644 struct fhandle *u_fhp; 645 struct ostatfs *buf; 646 }; 647 #endif 648 int 649 freebsd4_fhstatfs(td, uap) 650 struct thread *td; 651 struct freebsd4_fhstatfs_args /* { 652 struct fhandle *u_fhp; 653 struct ostatfs *buf; 654 } */ *uap; 655 { 656 struct ostatfs osb; 657 struct statfs sf; 658 fhandle_t fh; 659 int error; 660 661 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 662 if (error) 663 return (error); 664 error = kern_fhstatfs(td, fh, &sf); 665 if (error) 666 return (error); 667 cvtstatfs(&sf, &osb); 668 return (copyout(&osb, uap->buf, sizeof(osb))); 669 } 670 671 /* 672 * Convert a new format statfs structure to an old format statfs structure. 673 */ 674 static void 675 cvtstatfs(nsp, osp) 676 struct statfs *nsp; 677 struct ostatfs *osp; 678 { 679 680 statfs_scale_blocks(nsp, LONG_MAX); 681 bzero(osp, sizeof(*osp)); 682 osp->f_bsize = nsp->f_bsize; 683 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 684 osp->f_blocks = nsp->f_blocks; 685 osp->f_bfree = nsp->f_bfree; 686 osp->f_bavail = nsp->f_bavail; 687 osp->f_files = MIN(nsp->f_files, LONG_MAX); 688 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 689 osp->f_owner = nsp->f_owner; 690 osp->f_type = nsp->f_type; 691 osp->f_flags = nsp->f_flags; 692 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 693 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 694 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 695 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 696 strlcpy(osp->f_fstypename, nsp->f_fstypename, 697 MIN(MFSNAMELEN, OMFSNAMELEN)); 698 strlcpy(osp->f_mntonname, nsp->f_mntonname, 699 MIN(MNAMELEN, OMNAMELEN)); 700 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 701 MIN(MNAMELEN, OMNAMELEN)); 702 osp->f_fsid = nsp->f_fsid; 703 } 704 #endif /* COMPAT_FREEBSD4 */ 705 706 /* 707 * Change current working directory to a given file descriptor. 708 */ 709 #ifndef _SYS_SYSPROTO_H_ 710 struct fchdir_args { 711 int fd; 712 }; 713 #endif 714 int 715 fchdir(td, uap) 716 struct thread *td; 717 struct fchdir_args /* { 718 int fd; 719 } */ *uap; 720 { 721 register struct filedesc *fdp = td->td_proc->p_fd; 722 struct vnode *vp, *tdp, *vpold; 723 struct mount *mp; 724 struct file *fp; 725 int vfslocked; 726 int error; 727 728 AUDIT_ARG(fd, uap->fd); 729 if ((error = getvnode(fdp, uap->fd, &fp)) != 0) 730 return (error); 731 vp = fp->f_vnode; 732 VREF(vp); 733 fdrop(fp, td); 734 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 735 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 736 AUDIT_ARG(vnode, vp, ARG_VNODE1); 737 error = change_dir(vp, td); 738 while (!error && (mp = vp->v_mountedhere) != NULL) { 739 int tvfslocked; 740 if (vfs_busy(mp, 0, 0, td)) 741 continue; 742 tvfslocked = VFS_LOCK_GIANT(mp); 743 error = VFS_ROOT(mp, LK_EXCLUSIVE, &tdp, td); 744 vfs_unbusy(mp, td); 745 if (error) { 746 VFS_UNLOCK_GIANT(tvfslocked); 747 break; 748 } 749 vput(vp); 750 VFS_UNLOCK_GIANT(vfslocked); 751 vp = tdp; 752 vfslocked = tvfslocked; 753 } 754 if (error) { 755 vput(vp); 756 VFS_UNLOCK_GIANT(vfslocked); 757 return (error); 758 } 759 VOP_UNLOCK(vp, 0); 760 VFS_UNLOCK_GIANT(vfslocked); 761 FILEDESC_XLOCK(fdp); 762 vpold = fdp->fd_cdir; 763 fdp->fd_cdir = vp; 764 FILEDESC_XUNLOCK(fdp); 765 vfslocked = VFS_LOCK_GIANT(vpold->v_mount); 766 vrele(vpold); 767 VFS_UNLOCK_GIANT(vfslocked); 768 return (0); 769 } 770 771 /* 772 * Change current working directory (``.''). 773 */ 774 #ifndef _SYS_SYSPROTO_H_ 775 struct chdir_args { 776 char *path; 777 }; 778 #endif 779 int 780 chdir(td, uap) 781 struct thread *td; 782 struct chdir_args /* { 783 char *path; 784 } */ *uap; 785 { 786 787 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 788 } 789 790 int 791 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg) 792 { 793 register struct filedesc *fdp = td->td_proc->p_fd; 794 int error; 795 struct nameidata nd; 796 struct vnode *vp; 797 int vfslocked; 798 799 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1 | MPSAFE, 800 pathseg, path, td); 801 if ((error = namei(&nd)) != 0) 802 return (error); 803 vfslocked = NDHASGIANT(&nd); 804 if ((error = change_dir(nd.ni_vp, td)) != 0) { 805 vput(nd.ni_vp); 806 VFS_UNLOCK_GIANT(vfslocked); 807 NDFREE(&nd, NDF_ONLY_PNBUF); 808 return (error); 809 } 810 VOP_UNLOCK(nd.ni_vp, 0); 811 VFS_UNLOCK_GIANT(vfslocked); 812 NDFREE(&nd, NDF_ONLY_PNBUF); 813 FILEDESC_XLOCK(fdp); 814 vp = fdp->fd_cdir; 815 fdp->fd_cdir = nd.ni_vp; 816 FILEDESC_XUNLOCK(fdp); 817 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 818 vrele(vp); 819 VFS_UNLOCK_GIANT(vfslocked); 820 return (0); 821 } 822 823 /* 824 * Helper function for raised chroot(2) security function: Refuse if 825 * any filedescriptors are open directories. 826 */ 827 static int 828 chroot_refuse_vdir_fds(fdp) 829 struct filedesc *fdp; 830 { 831 struct vnode *vp; 832 struct file *fp; 833 int fd; 834 835 FILEDESC_LOCK_ASSERT(fdp); 836 837 for (fd = 0; fd < fdp->fd_nfiles ; fd++) { 838 fp = fget_locked(fdp, fd); 839 if (fp == NULL) 840 continue; 841 if (fp->f_type == DTYPE_VNODE) { 842 vp = fp->f_vnode; 843 if (vp->v_type == VDIR) 844 return (EPERM); 845 } 846 } 847 return (0); 848 } 849 850 /* 851 * This sysctl determines if we will allow a process to chroot(2) if it 852 * has a directory open: 853 * 0: disallowed for all processes. 854 * 1: allowed for processes that were not already chroot(2)'ed. 855 * 2: allowed for all processes. 856 */ 857 858 static int chroot_allow_open_directories = 1; 859 860 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, 861 &chroot_allow_open_directories, 0, ""); 862 863 /* 864 * Change notion of root (``/'') directory. 865 */ 866 #ifndef _SYS_SYSPROTO_H_ 867 struct chroot_args { 868 char *path; 869 }; 870 #endif 871 int 872 chroot(td, uap) 873 struct thread *td; 874 struct chroot_args /* { 875 char *path; 876 } */ *uap; 877 { 878 int error; 879 struct nameidata nd; 880 int vfslocked; 881 882 error = priv_check(td, PRIV_VFS_CHROOT); 883 if (error) 884 return (error); 885 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 886 UIO_USERSPACE, uap->path, td); 887 error = namei(&nd); 888 if (error) 889 goto error; 890 vfslocked = NDHASGIANT(&nd); 891 if ((error = change_dir(nd.ni_vp, td)) != 0) 892 goto e_vunlock; 893 #ifdef MAC 894 if ((error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp))) 895 goto e_vunlock; 896 #endif 897 VOP_UNLOCK(nd.ni_vp, 0); 898 error = change_root(nd.ni_vp, td); 899 vrele(nd.ni_vp); 900 VFS_UNLOCK_GIANT(vfslocked); 901 NDFREE(&nd, NDF_ONLY_PNBUF); 902 return (error); 903 e_vunlock: 904 vput(nd.ni_vp); 905 VFS_UNLOCK_GIANT(vfslocked); 906 error: 907 NDFREE(&nd, NDF_ONLY_PNBUF); 908 return (error); 909 } 910 911 /* 912 * Common routine for chroot and chdir. Callers must provide a locked vnode 913 * instance. 914 */ 915 int 916 change_dir(vp, td) 917 struct vnode *vp; 918 struct thread *td; 919 { 920 int error; 921 922 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 923 if (vp->v_type != VDIR) 924 return (ENOTDIR); 925 #ifdef MAC 926 error = mac_vnode_check_chdir(td->td_ucred, vp); 927 if (error) 928 return (error); 929 #endif 930 error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td); 931 return (error); 932 } 933 934 /* 935 * Common routine for kern_chroot() and jail_attach(). The caller is 936 * responsible for invoking priv_check() and mac_vnode_check_chroot() to 937 * authorize this operation. 938 */ 939 int 940 change_root(vp, td) 941 struct vnode *vp; 942 struct thread *td; 943 { 944 struct filedesc *fdp; 945 struct vnode *oldvp; 946 int vfslocked; 947 int error; 948 949 VFS_ASSERT_GIANT(vp->v_mount); 950 fdp = td->td_proc->p_fd; 951 FILEDESC_XLOCK(fdp); 952 if (chroot_allow_open_directories == 0 || 953 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { 954 error = chroot_refuse_vdir_fds(fdp); 955 if (error) { 956 FILEDESC_XUNLOCK(fdp); 957 return (error); 958 } 959 } 960 oldvp = fdp->fd_rdir; 961 fdp->fd_rdir = vp; 962 VREF(fdp->fd_rdir); 963 if (!fdp->fd_jdir) { 964 fdp->fd_jdir = vp; 965 VREF(fdp->fd_jdir); 966 } 967 FILEDESC_XUNLOCK(fdp); 968 vfslocked = VFS_LOCK_GIANT(oldvp->v_mount); 969 vrele(oldvp); 970 VFS_UNLOCK_GIANT(vfslocked); 971 return (0); 972 } 973 974 /* 975 * Check permissions, allocate an open file structure, and call the device 976 * open routine if any. 977 */ 978 #ifndef _SYS_SYSPROTO_H_ 979 struct open_args { 980 char *path; 981 int flags; 982 int mode; 983 }; 984 #endif 985 int 986 open(td, uap) 987 struct thread *td; 988 register struct open_args /* { 989 char *path; 990 int flags; 991 int mode; 992 } */ *uap; 993 { 994 995 return kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode); 996 } 997 998 int 999 kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags, 1000 int mode) 1001 { 1002 struct proc *p = td->td_proc; 1003 struct filedesc *fdp = p->p_fd; 1004 struct file *fp; 1005 struct vnode *vp; 1006 struct vattr vat; 1007 struct mount *mp; 1008 int cmode; 1009 struct file *nfp; 1010 int type, indx, error; 1011 struct flock lf; 1012 struct nameidata nd; 1013 int vfslocked; 1014 1015 AUDIT_ARG(fflags, flags); 1016 AUDIT_ARG(mode, mode); 1017 if ((flags & O_ACCMODE) == O_ACCMODE) 1018 return (EINVAL); 1019 flags = FFLAGS(flags); 1020 error = falloc(td, &nfp, &indx); 1021 if (error) 1022 return (error); 1023 /* An extra reference on `nfp' has been held for us by falloc(). */ 1024 fp = nfp; 1025 /* Set the flags early so the finit in devfs can pick them up. */ 1026 fp->f_flag = flags & FMASK; 1027 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 1028 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | MPSAFE, pathseg, path, td); 1029 td->td_dupfd = -1; /* XXX check for fdopen */ 1030 error = vn_open(&nd, &flags, cmode, fp); 1031 if (error) { 1032 /* 1033 * If the vn_open replaced the method vector, something 1034 * wonderous happened deep below and we just pass it up 1035 * pretending we know what we do. 1036 */ 1037 if (error == ENXIO && fp->f_ops != &badfileops) { 1038 fdrop(fp, td); 1039 td->td_retval[0] = indx; 1040 return (0); 1041 } 1042 1043 /* 1044 * handle special fdopen() case. bleh. dupfdopen() is 1045 * responsible for dropping the old contents of ofiles[indx] 1046 * if it succeeds. 1047 */ 1048 if ((error == ENODEV || error == ENXIO) && 1049 td->td_dupfd >= 0 && /* XXX from fdopen */ 1050 (error = 1051 dupfdopen(td, fdp, indx, td->td_dupfd, flags, error)) == 0) { 1052 td->td_retval[0] = indx; 1053 fdrop(fp, td); 1054 return (0); 1055 } 1056 /* 1057 * Clean up the descriptor, but only if another thread hadn't 1058 * replaced or closed it. 1059 */ 1060 fdclose(fdp, fp, indx, td); 1061 fdrop(fp, td); 1062 1063 if (error == ERESTART) 1064 error = EINTR; 1065 return (error); 1066 } 1067 td->td_dupfd = 0; 1068 vfslocked = NDHASGIANT(&nd); 1069 NDFREE(&nd, NDF_ONLY_PNBUF); 1070 vp = nd.ni_vp; 1071 1072 fp->f_vnode = vp; /* XXX Does devfs need this? */ 1073 /* 1074 * If the file wasn't claimed by devfs bind it to the normal 1075 * vnode operations here. 1076 */ 1077 if (fp->f_ops == &badfileops) { 1078 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); 1079 fp->f_seqcount = 1; 1080 finit(fp, flags & FMASK, DTYPE_VNODE, vp, &vnops); 1081 } 1082 1083 VOP_UNLOCK(vp, 0); 1084 if (flags & (O_EXLOCK | O_SHLOCK)) { 1085 lf.l_whence = SEEK_SET; 1086 lf.l_start = 0; 1087 lf.l_len = 0; 1088 if (flags & O_EXLOCK) 1089 lf.l_type = F_WRLCK; 1090 else 1091 lf.l_type = F_RDLCK; 1092 type = F_FLOCK; 1093 if ((flags & FNONBLOCK) == 0) 1094 type |= F_WAIT; 1095 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, 1096 type)) != 0) 1097 goto bad; 1098 atomic_set_int(&fp->f_flag, FHASLOCK); 1099 } 1100 if (flags & O_TRUNC) { 1101 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 1102 goto bad; 1103 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 1104 VATTR_NULL(&vat); 1105 vat.va_size = 0; 1106 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1107 #ifdef MAC 1108 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp); 1109 if (error == 0) 1110 #endif 1111 error = VOP_SETATTR(vp, &vat, td->td_ucred, td); 1112 VOP_UNLOCK(vp, 0); 1113 vn_finished_write(mp); 1114 if (error) 1115 goto bad; 1116 } 1117 VFS_UNLOCK_GIANT(vfslocked); 1118 /* 1119 * Release our private reference, leaving the one associated with 1120 * the descriptor table intact. 1121 */ 1122 fdrop(fp, td); 1123 td->td_retval[0] = indx; 1124 return (0); 1125 bad: 1126 VFS_UNLOCK_GIANT(vfslocked); 1127 fdclose(fdp, fp, indx, td); 1128 fdrop(fp, td); 1129 return (error); 1130 } 1131 1132 #ifdef COMPAT_43 1133 /* 1134 * Create a file. 1135 */ 1136 #ifndef _SYS_SYSPROTO_H_ 1137 struct ocreat_args { 1138 char *path; 1139 int mode; 1140 }; 1141 #endif 1142 int 1143 ocreat(td, uap) 1144 struct thread *td; 1145 register struct ocreat_args /* { 1146 char *path; 1147 int mode; 1148 } */ *uap; 1149 { 1150 1151 return (kern_open(td, uap->path, UIO_USERSPACE, 1152 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1153 } 1154 #endif /* COMPAT_43 */ 1155 1156 /* 1157 * Create a special file. 1158 */ 1159 #ifndef _SYS_SYSPROTO_H_ 1160 struct mknod_args { 1161 char *path; 1162 int mode; 1163 int dev; 1164 }; 1165 #endif 1166 int 1167 mknod(td, uap) 1168 struct thread *td; 1169 register struct mknod_args /* { 1170 char *path; 1171 int mode; 1172 int dev; 1173 } */ *uap; 1174 { 1175 1176 return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev)); 1177 } 1178 1179 int 1180 kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode, 1181 int dev) 1182 { 1183 struct vnode *vp; 1184 struct mount *mp; 1185 struct vattr vattr; 1186 int error; 1187 int whiteout = 0; 1188 struct nameidata nd; 1189 int vfslocked; 1190 1191 AUDIT_ARG(mode, mode); 1192 AUDIT_ARG(dev, dev); 1193 switch (mode & S_IFMT) { 1194 case S_IFCHR: 1195 case S_IFBLK: 1196 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1197 break; 1198 case S_IFMT: 1199 error = priv_check(td, PRIV_VFS_MKNOD_BAD); 1200 break; 1201 case S_IFWHT: 1202 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1203 break; 1204 default: 1205 error = EINVAL; 1206 break; 1207 } 1208 if (error) 1209 return (error); 1210 restart: 1211 bwillwrite(); 1212 NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, 1213 pathseg, path, td); 1214 if ((error = namei(&nd)) != 0) 1215 return (error); 1216 vfslocked = NDHASGIANT(&nd); 1217 vp = nd.ni_vp; 1218 if (vp != NULL) { 1219 NDFREE(&nd, NDF_ONLY_PNBUF); 1220 if (vp == nd.ni_dvp) 1221 vrele(nd.ni_dvp); 1222 else 1223 vput(nd.ni_dvp); 1224 vrele(vp); 1225 VFS_UNLOCK_GIANT(vfslocked); 1226 return (EEXIST); 1227 } else { 1228 VATTR_NULL(&vattr); 1229 FILEDESC_SLOCK(td->td_proc->p_fd); 1230 vattr.va_mode = (mode & ALLPERMS) & 1231 ~td->td_proc->p_fd->fd_cmask; 1232 FILEDESC_SUNLOCK(td->td_proc->p_fd); 1233 vattr.va_rdev = dev; 1234 whiteout = 0; 1235 1236 switch (mode & S_IFMT) { 1237 case S_IFMT: /* used by badsect to flag bad sectors */ 1238 vattr.va_type = VBAD; 1239 break; 1240 case S_IFCHR: 1241 vattr.va_type = VCHR; 1242 break; 1243 case S_IFBLK: 1244 vattr.va_type = VBLK; 1245 break; 1246 case S_IFWHT: 1247 whiteout = 1; 1248 break; 1249 default: 1250 panic("kern_mknod: invalid mode"); 1251 } 1252 } 1253 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1254 NDFREE(&nd, NDF_ONLY_PNBUF); 1255 vput(nd.ni_dvp); 1256 VFS_UNLOCK_GIANT(vfslocked); 1257 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1258 return (error); 1259 goto restart; 1260 } 1261 #ifdef MAC 1262 if (error == 0 && !whiteout) 1263 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1264 &nd.ni_cnd, &vattr); 1265 #endif 1266 if (!error) { 1267 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1268 if (whiteout) 1269 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1270 else { 1271 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1272 &nd.ni_cnd, &vattr); 1273 if (error == 0) 1274 vput(nd.ni_vp); 1275 } 1276 } 1277 NDFREE(&nd, NDF_ONLY_PNBUF); 1278 vput(nd.ni_dvp); 1279 vn_finished_write(mp); 1280 VFS_UNLOCK_GIANT(vfslocked); 1281 return (error); 1282 } 1283 1284 /* 1285 * Create a named pipe. 1286 */ 1287 #ifndef _SYS_SYSPROTO_H_ 1288 struct mkfifo_args { 1289 char *path; 1290 int mode; 1291 }; 1292 #endif 1293 int 1294 mkfifo(td, uap) 1295 struct thread *td; 1296 register struct mkfifo_args /* { 1297 char *path; 1298 int mode; 1299 } */ *uap; 1300 { 1301 1302 return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode)); 1303 } 1304 1305 int 1306 kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode) 1307 { 1308 struct mount *mp; 1309 struct vattr vattr; 1310 int error; 1311 struct nameidata nd; 1312 int vfslocked; 1313 1314 AUDIT_ARG(mode, mode); 1315 restart: 1316 bwillwrite(); 1317 NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, 1318 pathseg, path, td); 1319 if ((error = namei(&nd)) != 0) 1320 return (error); 1321 vfslocked = NDHASGIANT(&nd); 1322 if (nd.ni_vp != NULL) { 1323 NDFREE(&nd, NDF_ONLY_PNBUF); 1324 if (nd.ni_vp == nd.ni_dvp) 1325 vrele(nd.ni_dvp); 1326 else 1327 vput(nd.ni_dvp); 1328 vrele(nd.ni_vp); 1329 VFS_UNLOCK_GIANT(vfslocked); 1330 return (EEXIST); 1331 } 1332 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1333 NDFREE(&nd, NDF_ONLY_PNBUF); 1334 vput(nd.ni_dvp); 1335 VFS_UNLOCK_GIANT(vfslocked); 1336 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1337 return (error); 1338 goto restart; 1339 } 1340 VATTR_NULL(&vattr); 1341 vattr.va_type = VFIFO; 1342 FILEDESC_SLOCK(td->td_proc->p_fd); 1343 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1344 FILEDESC_SUNLOCK(td->td_proc->p_fd); 1345 #ifdef MAC 1346 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1347 &vattr); 1348 if (error) 1349 goto out; 1350 #endif 1351 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1352 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1353 if (error == 0) 1354 vput(nd.ni_vp); 1355 #ifdef MAC 1356 out: 1357 #endif 1358 vput(nd.ni_dvp); 1359 vn_finished_write(mp); 1360 VFS_UNLOCK_GIANT(vfslocked); 1361 NDFREE(&nd, NDF_ONLY_PNBUF); 1362 return (error); 1363 } 1364 1365 /* 1366 * Make a hard file link. 1367 */ 1368 #ifndef _SYS_SYSPROTO_H_ 1369 struct link_args { 1370 char *path; 1371 char *link; 1372 }; 1373 #endif 1374 int 1375 link(td, uap) 1376 struct thread *td; 1377 register struct link_args /* { 1378 char *path; 1379 char *link; 1380 } */ *uap; 1381 { 1382 int error; 1383 1384 error = kern_link(td, uap->path, uap->link, UIO_USERSPACE); 1385 return (error); 1386 } 1387 1388 static int hardlink_check_uid = 0; 1389 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1390 &hardlink_check_uid, 0, 1391 "Unprivileged processes cannot create hard links to files owned by other " 1392 "users"); 1393 static int hardlink_check_gid = 0; 1394 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1395 &hardlink_check_gid, 0, 1396 "Unprivileged processes cannot create hard links to files owned by other " 1397 "groups"); 1398 1399 static int 1400 can_hardlink(struct vnode *vp, struct thread *td, struct ucred *cred) 1401 { 1402 struct vattr va; 1403 int error; 1404 1405 if (!hardlink_check_uid && !hardlink_check_gid) 1406 return (0); 1407 1408 error = VOP_GETATTR(vp, &va, cred, td); 1409 if (error != 0) 1410 return (error); 1411 1412 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1413 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1414 if (error) 1415 return (error); 1416 } 1417 1418 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1419 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1420 if (error) 1421 return (error); 1422 } 1423 1424 return (0); 1425 } 1426 1427 int 1428 kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg) 1429 { 1430 struct vnode *vp; 1431 struct mount *mp; 1432 struct nameidata nd; 1433 int vfslocked; 1434 int lvfslocked; 1435 int error; 1436 1437 bwillwrite(); 1438 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, segflg, path, td); 1439 if ((error = namei(&nd)) != 0) 1440 return (error); 1441 vfslocked = NDHASGIANT(&nd); 1442 NDFREE(&nd, NDF_ONLY_PNBUF); 1443 vp = nd.ni_vp; 1444 if (vp->v_type == VDIR) { 1445 vrele(vp); 1446 VFS_UNLOCK_GIANT(vfslocked); 1447 return (EPERM); /* POSIX */ 1448 } 1449 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 1450 vrele(vp); 1451 VFS_UNLOCK_GIANT(vfslocked); 1452 return (error); 1453 } 1454 NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE2, 1455 segflg, link, td); 1456 if ((error = namei(&nd)) == 0) { 1457 lvfslocked = NDHASGIANT(&nd); 1458 if (nd.ni_vp != NULL) { 1459 if (nd.ni_dvp == nd.ni_vp) 1460 vrele(nd.ni_dvp); 1461 else 1462 vput(nd.ni_dvp); 1463 vrele(nd.ni_vp); 1464 error = EEXIST; 1465 } else if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) 1466 == 0) { 1467 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1468 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 1469 error = can_hardlink(vp, td, td->td_ucred); 1470 if (error == 0) 1471 #ifdef MAC 1472 error = mac_vnode_check_link(td->td_ucred, 1473 nd.ni_dvp, vp, &nd.ni_cnd); 1474 if (error == 0) 1475 #endif 1476 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1477 VOP_UNLOCK(vp, 0); 1478 vput(nd.ni_dvp); 1479 } 1480 NDFREE(&nd, NDF_ONLY_PNBUF); 1481 VFS_UNLOCK_GIANT(lvfslocked); 1482 } 1483 vrele(vp); 1484 vn_finished_write(mp); 1485 VFS_UNLOCK_GIANT(vfslocked); 1486 return (error); 1487 } 1488 1489 /* 1490 * Make a symbolic link. 1491 */ 1492 #ifndef _SYS_SYSPROTO_H_ 1493 struct symlink_args { 1494 char *path; 1495 char *link; 1496 }; 1497 #endif 1498 int 1499 symlink(td, uap) 1500 struct thread *td; 1501 register struct symlink_args /* { 1502 char *path; 1503 char *link; 1504 } */ *uap; 1505 { 1506 1507 return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE)); 1508 } 1509 1510 int 1511 kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg) 1512 { 1513 struct mount *mp; 1514 struct vattr vattr; 1515 char *syspath; 1516 int error; 1517 struct nameidata nd; 1518 int vfslocked; 1519 1520 if (segflg == UIO_SYSSPACE) { 1521 syspath = path; 1522 } else { 1523 syspath = uma_zalloc(namei_zone, M_WAITOK); 1524 if ((error = copyinstr(path, syspath, MAXPATHLEN, NULL)) != 0) 1525 goto out; 1526 } 1527 AUDIT_ARG(text, syspath); 1528 restart: 1529 bwillwrite(); 1530 NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, 1531 segflg, link, td); 1532 if ((error = namei(&nd)) != 0) 1533 goto out; 1534 vfslocked = NDHASGIANT(&nd); 1535 if (nd.ni_vp) { 1536 NDFREE(&nd, NDF_ONLY_PNBUF); 1537 if (nd.ni_vp == nd.ni_dvp) 1538 vrele(nd.ni_dvp); 1539 else 1540 vput(nd.ni_dvp); 1541 vrele(nd.ni_vp); 1542 VFS_UNLOCK_GIANT(vfslocked); 1543 error = EEXIST; 1544 goto out; 1545 } 1546 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1547 NDFREE(&nd, NDF_ONLY_PNBUF); 1548 vput(nd.ni_dvp); 1549 VFS_UNLOCK_GIANT(vfslocked); 1550 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1551 goto out; 1552 goto restart; 1553 } 1554 VATTR_NULL(&vattr); 1555 FILEDESC_SLOCK(td->td_proc->p_fd); 1556 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1557 FILEDESC_SUNLOCK(td->td_proc->p_fd); 1558 #ifdef MAC 1559 vattr.va_type = VLNK; 1560 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1561 &vattr); 1562 if (error) 1563 goto out2; 1564 #endif 1565 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1566 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1567 if (error == 0) 1568 vput(nd.ni_vp); 1569 #ifdef MAC 1570 out2: 1571 #endif 1572 NDFREE(&nd, NDF_ONLY_PNBUF); 1573 vput(nd.ni_dvp); 1574 vn_finished_write(mp); 1575 VFS_UNLOCK_GIANT(vfslocked); 1576 out: 1577 if (segflg != UIO_SYSSPACE) 1578 uma_zfree(namei_zone, syspath); 1579 return (error); 1580 } 1581 1582 /* 1583 * Delete a whiteout from the filesystem. 1584 */ 1585 int 1586 undelete(td, uap) 1587 struct thread *td; 1588 register struct undelete_args /* { 1589 char *path; 1590 } */ *uap; 1591 { 1592 int error; 1593 struct mount *mp; 1594 struct nameidata nd; 1595 int vfslocked; 1596 1597 restart: 1598 bwillwrite(); 1599 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | MPSAFE | AUDITVNODE1, 1600 UIO_USERSPACE, uap->path, td); 1601 error = namei(&nd); 1602 if (error) 1603 return (error); 1604 vfslocked = NDHASGIANT(&nd); 1605 1606 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1607 NDFREE(&nd, NDF_ONLY_PNBUF); 1608 if (nd.ni_vp == nd.ni_dvp) 1609 vrele(nd.ni_dvp); 1610 else 1611 vput(nd.ni_dvp); 1612 if (nd.ni_vp) 1613 vrele(nd.ni_vp); 1614 VFS_UNLOCK_GIANT(vfslocked); 1615 return (EEXIST); 1616 } 1617 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1618 NDFREE(&nd, NDF_ONLY_PNBUF); 1619 vput(nd.ni_dvp); 1620 VFS_UNLOCK_GIANT(vfslocked); 1621 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1622 return (error); 1623 goto restart; 1624 } 1625 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1626 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1627 NDFREE(&nd, NDF_ONLY_PNBUF); 1628 vput(nd.ni_dvp); 1629 vn_finished_write(mp); 1630 VFS_UNLOCK_GIANT(vfslocked); 1631 return (error); 1632 } 1633 1634 /* 1635 * Delete a name from the filesystem. 1636 */ 1637 #ifndef _SYS_SYSPROTO_H_ 1638 struct unlink_args { 1639 char *path; 1640 }; 1641 #endif 1642 int 1643 unlink(td, uap) 1644 struct thread *td; 1645 struct unlink_args /* { 1646 char *path; 1647 } */ *uap; 1648 { 1649 int error; 1650 1651 error = kern_unlink(td, uap->path, UIO_USERSPACE); 1652 return (error); 1653 } 1654 1655 int 1656 kern_unlink(struct thread *td, char *path, enum uio_seg pathseg) 1657 { 1658 struct mount *mp; 1659 struct vnode *vp; 1660 int error; 1661 struct nameidata nd; 1662 int vfslocked; 1663 1664 restart: 1665 bwillwrite(); 1666 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | AUDITVNODE1, 1667 pathseg, path, td); 1668 if ((error = namei(&nd)) != 0) 1669 return (error == EINVAL ? EPERM : error); 1670 vfslocked = NDHASGIANT(&nd); 1671 vp = nd.ni_vp; 1672 if (vp->v_type == VDIR) 1673 error = EPERM; /* POSIX */ 1674 else { 1675 /* 1676 * The root of a mounted filesystem cannot be deleted. 1677 * 1678 * XXX: can this only be a VDIR case? 1679 */ 1680 if (vp->v_vflag & VV_ROOT) 1681 error = EBUSY; 1682 } 1683 if (error == 0) { 1684 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1685 NDFREE(&nd, NDF_ONLY_PNBUF); 1686 vput(nd.ni_dvp); 1687 if (vp == nd.ni_dvp) 1688 vrele(vp); 1689 else 1690 vput(vp); 1691 VFS_UNLOCK_GIANT(vfslocked); 1692 if ((error = vn_start_write(NULL, &mp, 1693 V_XSLEEP | PCATCH)) != 0) 1694 return (error); 1695 goto restart; 1696 } 1697 #ifdef MAC 1698 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1699 &nd.ni_cnd); 1700 if (error) 1701 goto out; 1702 #endif 1703 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1704 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1705 #ifdef MAC 1706 out: 1707 #endif 1708 vn_finished_write(mp); 1709 } 1710 NDFREE(&nd, NDF_ONLY_PNBUF); 1711 vput(nd.ni_dvp); 1712 if (vp == nd.ni_dvp) 1713 vrele(vp); 1714 else 1715 vput(vp); 1716 VFS_UNLOCK_GIANT(vfslocked); 1717 return (error); 1718 } 1719 1720 /* 1721 * Reposition read/write file offset. 1722 */ 1723 #ifndef _SYS_SYSPROTO_H_ 1724 struct lseek_args { 1725 int fd; 1726 int pad; 1727 off_t offset; 1728 int whence; 1729 }; 1730 #endif 1731 int 1732 lseek(td, uap) 1733 struct thread *td; 1734 register struct lseek_args /* { 1735 int fd; 1736 int pad; 1737 off_t offset; 1738 int whence; 1739 } */ *uap; 1740 { 1741 struct ucred *cred = td->td_ucred; 1742 struct file *fp; 1743 struct vnode *vp; 1744 struct vattr vattr; 1745 off_t offset; 1746 int error, noneg; 1747 int vfslocked; 1748 1749 if ((error = fget(td, uap->fd, &fp)) != 0) 1750 return (error); 1751 if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) { 1752 fdrop(fp, td); 1753 return (ESPIPE); 1754 } 1755 vp = fp->f_vnode; 1756 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 1757 noneg = (vp->v_type != VCHR); 1758 offset = uap->offset; 1759 switch (uap->whence) { 1760 case L_INCR: 1761 if (noneg && 1762 (fp->f_offset < 0 || 1763 (offset > 0 && fp->f_offset > OFF_MAX - offset))) { 1764 error = EOVERFLOW; 1765 break; 1766 } 1767 offset += fp->f_offset; 1768 break; 1769 case L_XTND: 1770 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1771 error = VOP_GETATTR(vp, &vattr, cred, td); 1772 VOP_UNLOCK(vp, 0); 1773 if (error) 1774 break; 1775 if (noneg && 1776 (vattr.va_size > OFF_MAX || 1777 (offset > 0 && vattr.va_size > OFF_MAX - offset))) { 1778 error = EOVERFLOW; 1779 break; 1780 } 1781 offset += vattr.va_size; 1782 break; 1783 case L_SET: 1784 break; 1785 case SEEK_DATA: 1786 error = fo_ioctl(fp, FIOSEEKDATA, &offset, cred, td); 1787 break; 1788 case SEEK_HOLE: 1789 error = fo_ioctl(fp, FIOSEEKHOLE, &offset, cred, td); 1790 break; 1791 default: 1792 error = EINVAL; 1793 } 1794 if (error == 0 && noneg && offset < 0) 1795 error = EINVAL; 1796 if (error != 0) 1797 goto drop; 1798 fp->f_offset = offset; 1799 *(off_t *)(td->td_retval) = fp->f_offset; 1800 drop: 1801 fdrop(fp, td); 1802 VFS_UNLOCK_GIANT(vfslocked); 1803 return (error); 1804 } 1805 1806 #if defined(COMPAT_43) 1807 /* 1808 * Reposition read/write file offset. 1809 */ 1810 #ifndef _SYS_SYSPROTO_H_ 1811 struct olseek_args { 1812 int fd; 1813 long offset; 1814 int whence; 1815 }; 1816 #endif 1817 int 1818 olseek(td, uap) 1819 struct thread *td; 1820 register struct olseek_args /* { 1821 int fd; 1822 long offset; 1823 int whence; 1824 } */ *uap; 1825 { 1826 struct lseek_args /* { 1827 int fd; 1828 int pad; 1829 off_t offset; 1830 int whence; 1831 } */ nuap; 1832 1833 nuap.fd = uap->fd; 1834 nuap.offset = uap->offset; 1835 nuap.whence = uap->whence; 1836 return (lseek(td, &nuap)); 1837 } 1838 #endif /* COMPAT_43 */ 1839 1840 /* Version with the 'pad' argument */ 1841 int 1842 freebsd6_lseek(td, uap) 1843 struct thread *td; 1844 register struct freebsd6_lseek_args *uap; 1845 { 1846 struct lseek_args ouap; 1847 1848 ouap.fd = uap->fd; 1849 ouap.offset = uap->offset; 1850 ouap.whence = uap->whence; 1851 return (lseek(td, &ouap)); 1852 } 1853 1854 /* 1855 * Check access permissions using passed credentials. 1856 */ 1857 static int 1858 vn_access(vp, user_flags, cred, td) 1859 struct vnode *vp; 1860 int user_flags; 1861 struct ucred *cred; 1862 struct thread *td; 1863 { 1864 int error, flags; 1865 1866 /* Flags == 0 means only check for existence. */ 1867 error = 0; 1868 if (user_flags) { 1869 flags = 0; 1870 if (user_flags & R_OK) 1871 flags |= VREAD; 1872 if (user_flags & W_OK) 1873 flags |= VWRITE; 1874 if (user_flags & X_OK) 1875 flags |= VEXEC; 1876 #ifdef MAC 1877 error = mac_vnode_check_access(cred, vp, flags); 1878 if (error) 1879 return (error); 1880 #endif 1881 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1882 error = VOP_ACCESS(vp, flags, cred, td); 1883 } 1884 return (error); 1885 } 1886 1887 /* 1888 * Check access permissions using "real" credentials. 1889 */ 1890 #ifndef _SYS_SYSPROTO_H_ 1891 struct access_args { 1892 char *path; 1893 int flags; 1894 }; 1895 #endif 1896 int 1897 access(td, uap) 1898 struct thread *td; 1899 register struct access_args /* { 1900 char *path; 1901 int flags; 1902 } */ *uap; 1903 { 1904 1905 return (kern_access(td, uap->path, UIO_USERSPACE, uap->flags)); 1906 } 1907 1908 int 1909 kern_access(struct thread *td, char *path, enum uio_seg pathseg, int flags) 1910 { 1911 struct ucred *cred, *tmpcred; 1912 register struct vnode *vp; 1913 struct nameidata nd; 1914 int vfslocked; 1915 int error; 1916 1917 /* 1918 * Create and modify a temporary credential instead of one that 1919 * is potentially shared. This could also mess up socket 1920 * buffer accounting which can run in an interrupt context. 1921 */ 1922 cred = td->td_ucred; 1923 tmpcred = crdup(cred); 1924 tmpcred->cr_uid = cred->cr_ruid; 1925 tmpcred->cr_groups[0] = cred->cr_rgid; 1926 td->td_ucred = tmpcred; 1927 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1928 pathseg, path, td); 1929 if ((error = namei(&nd)) != 0) 1930 goto out1; 1931 vfslocked = NDHASGIANT(&nd); 1932 vp = nd.ni_vp; 1933 1934 error = vn_access(vp, flags, tmpcred, td); 1935 NDFREE(&nd, NDF_ONLY_PNBUF); 1936 vput(vp); 1937 VFS_UNLOCK_GIANT(vfslocked); 1938 out1: 1939 td->td_ucred = cred; 1940 crfree(tmpcred); 1941 return (error); 1942 } 1943 1944 /* 1945 * Check access permissions using "effective" credentials. 1946 */ 1947 #ifndef _SYS_SYSPROTO_H_ 1948 struct eaccess_args { 1949 char *path; 1950 int flags; 1951 }; 1952 #endif 1953 int 1954 eaccess(td, uap) 1955 struct thread *td; 1956 register struct eaccess_args /* { 1957 char *path; 1958 int flags; 1959 } */ *uap; 1960 { 1961 1962 return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->flags)); 1963 } 1964 1965 int 1966 kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int flags) 1967 { 1968 struct nameidata nd; 1969 struct vnode *vp; 1970 int vfslocked; 1971 int error; 1972 1973 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1974 pathseg, path, td); 1975 if ((error = namei(&nd)) != 0) 1976 return (error); 1977 vp = nd.ni_vp; 1978 vfslocked = NDHASGIANT(&nd); 1979 error = vn_access(vp, flags, td->td_ucred, td); 1980 NDFREE(&nd, NDF_ONLY_PNBUF); 1981 vput(vp); 1982 VFS_UNLOCK_GIANT(vfslocked); 1983 return (error); 1984 } 1985 1986 #if defined(COMPAT_43) 1987 /* 1988 * Get file status; this version follows links. 1989 */ 1990 #ifndef _SYS_SYSPROTO_H_ 1991 struct ostat_args { 1992 char *path; 1993 struct ostat *ub; 1994 }; 1995 #endif 1996 int 1997 ostat(td, uap) 1998 struct thread *td; 1999 register struct ostat_args /* { 2000 char *path; 2001 struct ostat *ub; 2002 } */ *uap; 2003 { 2004 struct stat sb; 2005 struct ostat osb; 2006 int error; 2007 2008 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); 2009 if (error) 2010 return (error); 2011 cvtstat(&sb, &osb); 2012 error = copyout(&osb, uap->ub, sizeof (osb)); 2013 return (error); 2014 } 2015 2016 /* 2017 * Get file status; this version does not follow links. 2018 */ 2019 #ifndef _SYS_SYSPROTO_H_ 2020 struct olstat_args { 2021 char *path; 2022 struct ostat *ub; 2023 }; 2024 #endif 2025 int 2026 olstat(td, uap) 2027 struct thread *td; 2028 register struct olstat_args /* { 2029 char *path; 2030 struct ostat *ub; 2031 } */ *uap; 2032 { 2033 struct stat sb; 2034 struct ostat osb; 2035 int error; 2036 2037 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); 2038 if (error) 2039 return (error); 2040 cvtstat(&sb, &osb); 2041 error = copyout(&osb, uap->ub, sizeof (osb)); 2042 return (error); 2043 } 2044 2045 /* 2046 * Convert from an old to a new stat structure. 2047 */ 2048 void 2049 cvtstat(st, ost) 2050 struct stat *st; 2051 struct ostat *ost; 2052 { 2053 2054 ost->st_dev = st->st_dev; 2055 ost->st_ino = st->st_ino; 2056 ost->st_mode = st->st_mode; 2057 ost->st_nlink = st->st_nlink; 2058 ost->st_uid = st->st_uid; 2059 ost->st_gid = st->st_gid; 2060 ost->st_rdev = st->st_rdev; 2061 if (st->st_size < (quad_t)1 << 32) 2062 ost->st_size = st->st_size; 2063 else 2064 ost->st_size = -2; 2065 ost->st_atime = st->st_atime; 2066 ost->st_mtime = st->st_mtime; 2067 ost->st_ctime = st->st_ctime; 2068 ost->st_blksize = st->st_blksize; 2069 ost->st_blocks = st->st_blocks; 2070 ost->st_flags = st->st_flags; 2071 ost->st_gen = st->st_gen; 2072 } 2073 #endif /* COMPAT_43 */ 2074 2075 /* 2076 * Get file status; this version follows links. 2077 */ 2078 #ifndef _SYS_SYSPROTO_H_ 2079 struct stat_args { 2080 char *path; 2081 struct stat *ub; 2082 }; 2083 #endif 2084 int 2085 stat(td, uap) 2086 struct thread *td; 2087 register struct stat_args /* { 2088 char *path; 2089 struct stat *ub; 2090 } */ *uap; 2091 { 2092 struct stat sb; 2093 int error; 2094 2095 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); 2096 if (error == 0) 2097 error = copyout(&sb, uap->ub, sizeof (sb)); 2098 return (error); 2099 } 2100 2101 int 2102 kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp) 2103 { 2104 struct nameidata nd; 2105 struct stat sb; 2106 int error, vfslocked; 2107 2108 NDINIT(&nd, LOOKUP, 2109 FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1, 2110 pathseg, path, td); 2111 if ((error = namei(&nd)) != 0) 2112 return (error); 2113 vfslocked = NDHASGIANT(&nd); 2114 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 2115 NDFREE(&nd, NDF_ONLY_PNBUF); 2116 vput(nd.ni_vp); 2117 VFS_UNLOCK_GIANT(vfslocked); 2118 if (mtx_owned(&Giant)) 2119 printf("stat(%d): %s\n", vfslocked, path); 2120 if (error) 2121 return (error); 2122 *sbp = sb; 2123 return (0); 2124 } 2125 2126 /* 2127 * Get file status; this version does not follow links. 2128 */ 2129 #ifndef _SYS_SYSPROTO_H_ 2130 struct lstat_args { 2131 char *path; 2132 struct stat *ub; 2133 }; 2134 #endif 2135 int 2136 lstat(td, uap) 2137 struct thread *td; 2138 register struct lstat_args /* { 2139 char *path; 2140 struct stat *ub; 2141 } */ *uap; 2142 { 2143 struct stat sb; 2144 int error; 2145 2146 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); 2147 if (error == 0) 2148 error = copyout(&sb, uap->ub, sizeof (sb)); 2149 return (error); 2150 } 2151 2152 int 2153 kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp) 2154 { 2155 struct vnode *vp; 2156 struct stat sb; 2157 struct nameidata nd; 2158 int error, vfslocked; 2159 2160 NDINIT(&nd, LOOKUP, 2161 NOFOLLOW | LOCKLEAF | LOCKSHARED | MPSAFE | AUDITVNODE1, 2162 pathseg, path, td); 2163 if ((error = namei(&nd)) != 0) 2164 return (error); 2165 vfslocked = NDHASGIANT(&nd); 2166 vp = nd.ni_vp; 2167 error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td); 2168 NDFREE(&nd, NDF_ONLY_PNBUF); 2169 vput(vp); 2170 VFS_UNLOCK_GIANT(vfslocked); 2171 if (error) 2172 return (error); 2173 *sbp = sb; 2174 return (0); 2175 } 2176 2177 /* 2178 * Implementation of the NetBSD [l]stat() functions. 2179 */ 2180 void 2181 cvtnstat(sb, nsb) 2182 struct stat *sb; 2183 struct nstat *nsb; 2184 { 2185 bzero(nsb, sizeof *nsb); 2186 nsb->st_dev = sb->st_dev; 2187 nsb->st_ino = sb->st_ino; 2188 nsb->st_mode = sb->st_mode; 2189 nsb->st_nlink = sb->st_nlink; 2190 nsb->st_uid = sb->st_uid; 2191 nsb->st_gid = sb->st_gid; 2192 nsb->st_rdev = sb->st_rdev; 2193 nsb->st_atimespec = sb->st_atimespec; 2194 nsb->st_mtimespec = sb->st_mtimespec; 2195 nsb->st_ctimespec = sb->st_ctimespec; 2196 nsb->st_size = sb->st_size; 2197 nsb->st_blocks = sb->st_blocks; 2198 nsb->st_blksize = sb->st_blksize; 2199 nsb->st_flags = sb->st_flags; 2200 nsb->st_gen = sb->st_gen; 2201 nsb->st_birthtimespec = sb->st_birthtimespec; 2202 } 2203 2204 #ifndef _SYS_SYSPROTO_H_ 2205 struct nstat_args { 2206 char *path; 2207 struct nstat *ub; 2208 }; 2209 #endif 2210 int 2211 nstat(td, uap) 2212 struct thread *td; 2213 register struct nstat_args /* { 2214 char *path; 2215 struct nstat *ub; 2216 } */ *uap; 2217 { 2218 struct stat sb; 2219 struct nstat nsb; 2220 int error; 2221 2222 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); 2223 if (error) 2224 return (error); 2225 cvtnstat(&sb, &nsb); 2226 error = copyout(&nsb, uap->ub, sizeof (nsb)); 2227 return (error); 2228 } 2229 2230 /* 2231 * NetBSD lstat. Get file status; this version does not follow links. 2232 */ 2233 #ifndef _SYS_SYSPROTO_H_ 2234 struct lstat_args { 2235 char *path; 2236 struct stat *ub; 2237 }; 2238 #endif 2239 int 2240 nlstat(td, uap) 2241 struct thread *td; 2242 register struct nlstat_args /* { 2243 char *path; 2244 struct nstat *ub; 2245 } */ *uap; 2246 { 2247 struct stat sb; 2248 struct nstat nsb; 2249 int error; 2250 2251 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); 2252 if (error) 2253 return (error); 2254 cvtnstat(&sb, &nsb); 2255 error = copyout(&nsb, uap->ub, sizeof (nsb)); 2256 return (error); 2257 } 2258 2259 /* 2260 * Get configurable pathname variables. 2261 */ 2262 #ifndef _SYS_SYSPROTO_H_ 2263 struct pathconf_args { 2264 char *path; 2265 int name; 2266 }; 2267 #endif 2268 int 2269 pathconf(td, uap) 2270 struct thread *td; 2271 register struct pathconf_args /* { 2272 char *path; 2273 int name; 2274 } */ *uap; 2275 { 2276 2277 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name)); 2278 } 2279 2280 int 2281 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name) 2282 { 2283 struct nameidata nd; 2284 int error, vfslocked; 2285 2286 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 2287 pathseg, path, td); 2288 if ((error = namei(&nd)) != 0) 2289 return (error); 2290 vfslocked = NDHASGIANT(&nd); 2291 NDFREE(&nd, NDF_ONLY_PNBUF); 2292 2293 /* If asynchronous I/O is available, it works for all files. */ 2294 if (name == _PC_ASYNC_IO) 2295 td->td_retval[0] = async_io_version; 2296 else 2297 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval); 2298 vput(nd.ni_vp); 2299 VFS_UNLOCK_GIANT(vfslocked); 2300 return (error); 2301 } 2302 2303 /* 2304 * Return target name of a symbolic link. 2305 */ 2306 #ifndef _SYS_SYSPROTO_H_ 2307 struct readlink_args { 2308 char *path; 2309 char *buf; 2310 size_t count; 2311 }; 2312 #endif 2313 int 2314 readlink(td, uap) 2315 struct thread *td; 2316 register struct readlink_args /* { 2317 char *path; 2318 char *buf; 2319 size_t count; 2320 } */ *uap; 2321 { 2322 2323 return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf, 2324 UIO_USERSPACE, uap->count)); 2325 } 2326 2327 int 2328 kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf, 2329 enum uio_seg bufseg, size_t count) 2330 { 2331 register struct vnode *vp; 2332 struct iovec aiov; 2333 struct uio auio; 2334 int error; 2335 struct nameidata nd; 2336 int vfslocked; 2337 2338 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 2339 pathseg, path, td); 2340 if ((error = namei(&nd)) != 0) 2341 return (error); 2342 NDFREE(&nd, NDF_ONLY_PNBUF); 2343 vfslocked = NDHASGIANT(&nd); 2344 vp = nd.ni_vp; 2345 #ifdef MAC 2346 error = mac_vnode_check_readlink(td->td_ucred, vp); 2347 if (error) { 2348 vput(vp); 2349 VFS_UNLOCK_GIANT(vfslocked); 2350 return (error); 2351 } 2352 #endif 2353 if (vp->v_type != VLNK) 2354 error = EINVAL; 2355 else { 2356 aiov.iov_base = buf; 2357 aiov.iov_len = count; 2358 auio.uio_iov = &aiov; 2359 auio.uio_iovcnt = 1; 2360 auio.uio_offset = 0; 2361 auio.uio_rw = UIO_READ; 2362 auio.uio_segflg = bufseg; 2363 auio.uio_td = td; 2364 auio.uio_resid = count; 2365 error = VOP_READLINK(vp, &auio, td->td_ucred); 2366 } 2367 vput(vp); 2368 VFS_UNLOCK_GIANT(vfslocked); 2369 td->td_retval[0] = count - auio.uio_resid; 2370 return (error); 2371 } 2372 2373 /* 2374 * Common implementation code for chflags() and fchflags(). 2375 */ 2376 static int 2377 setfflags(td, vp, flags) 2378 struct thread *td; 2379 struct vnode *vp; 2380 int flags; 2381 { 2382 int error; 2383 struct mount *mp; 2384 struct vattr vattr; 2385 2386 /* 2387 * Prevent non-root users from setting flags on devices. When 2388 * a device is reused, users can retain ownership of the device 2389 * if they are allowed to set flags and programs assume that 2390 * chown can't fail when done as root. 2391 */ 2392 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2393 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2394 if (error) 2395 return (error); 2396 } 2397 2398 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2399 return (error); 2400 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2401 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2402 VATTR_NULL(&vattr); 2403 vattr.va_flags = flags; 2404 #ifdef MAC 2405 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2406 if (error == 0) 2407 #endif 2408 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 2409 VOP_UNLOCK(vp, 0); 2410 vn_finished_write(mp); 2411 return (error); 2412 } 2413 2414 /* 2415 * Change flags of a file given a path name. 2416 */ 2417 #ifndef _SYS_SYSPROTO_H_ 2418 struct chflags_args { 2419 char *path; 2420 int flags; 2421 }; 2422 #endif 2423 int 2424 chflags(td, uap) 2425 struct thread *td; 2426 register struct chflags_args /* { 2427 char *path; 2428 int flags; 2429 } */ *uap; 2430 { 2431 int error; 2432 struct nameidata nd; 2433 int vfslocked; 2434 2435 AUDIT_ARG(fflags, uap->flags); 2436 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE, 2437 uap->path, td); 2438 if ((error = namei(&nd)) != 0) 2439 return (error); 2440 NDFREE(&nd, NDF_ONLY_PNBUF); 2441 vfslocked = NDHASGIANT(&nd); 2442 error = setfflags(td, nd.ni_vp, uap->flags); 2443 vrele(nd.ni_vp); 2444 VFS_UNLOCK_GIANT(vfslocked); 2445 return (error); 2446 } 2447 2448 /* 2449 * Same as chflags() but doesn't follow symlinks. 2450 */ 2451 int 2452 lchflags(td, uap) 2453 struct thread *td; 2454 register struct lchflags_args /* { 2455 char *path; 2456 int flags; 2457 } */ *uap; 2458 { 2459 int error; 2460 struct nameidata nd; 2461 int vfslocked; 2462 2463 AUDIT_ARG(fflags, uap->flags); 2464 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE, 2465 uap->path, td); 2466 if ((error = namei(&nd)) != 0) 2467 return (error); 2468 vfslocked = NDHASGIANT(&nd); 2469 NDFREE(&nd, NDF_ONLY_PNBUF); 2470 error = setfflags(td, nd.ni_vp, uap->flags); 2471 vrele(nd.ni_vp); 2472 VFS_UNLOCK_GIANT(vfslocked); 2473 return (error); 2474 } 2475 2476 /* 2477 * Change flags of a file given a file descriptor. 2478 */ 2479 #ifndef _SYS_SYSPROTO_H_ 2480 struct fchflags_args { 2481 int fd; 2482 int flags; 2483 }; 2484 #endif 2485 int 2486 fchflags(td, uap) 2487 struct thread *td; 2488 register struct fchflags_args /* { 2489 int fd; 2490 int flags; 2491 } */ *uap; 2492 { 2493 struct file *fp; 2494 int vfslocked; 2495 int error; 2496 2497 AUDIT_ARG(fd, uap->fd); 2498 AUDIT_ARG(fflags, uap->flags); 2499 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 2500 return (error); 2501 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); 2502 #ifdef AUDIT 2503 vn_lock(fp->f_vnode, LK_EXCLUSIVE | LK_RETRY); 2504 AUDIT_ARG(vnode, fp->f_vnode, ARG_VNODE1); 2505 VOP_UNLOCK(fp->f_vnode, 0); 2506 #endif 2507 error = setfflags(td, fp->f_vnode, uap->flags); 2508 VFS_UNLOCK_GIANT(vfslocked); 2509 fdrop(fp, td); 2510 return (error); 2511 } 2512 2513 /* 2514 * Common implementation code for chmod(), lchmod() and fchmod(). 2515 */ 2516 static int 2517 setfmode(td, vp, mode) 2518 struct thread *td; 2519 struct vnode *vp; 2520 int mode; 2521 { 2522 int error; 2523 struct mount *mp; 2524 struct vattr vattr; 2525 2526 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2527 return (error); 2528 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2529 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2530 VATTR_NULL(&vattr); 2531 vattr.va_mode = mode & ALLPERMS; 2532 #ifdef MAC 2533 error = mac_vnode_check_setmode(td->td_ucred, vp, vattr.va_mode); 2534 if (error == 0) 2535 #endif 2536 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 2537 VOP_UNLOCK(vp, 0); 2538 vn_finished_write(mp); 2539 return (error); 2540 } 2541 2542 /* 2543 * Change mode of a file given path name. 2544 */ 2545 #ifndef _SYS_SYSPROTO_H_ 2546 struct chmod_args { 2547 char *path; 2548 int mode; 2549 }; 2550 #endif 2551 int 2552 chmod(td, uap) 2553 struct thread *td; 2554 register struct chmod_args /* { 2555 char *path; 2556 int mode; 2557 } */ *uap; 2558 { 2559 2560 return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode)); 2561 } 2562 2563 int 2564 kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode) 2565 { 2566 int error; 2567 struct nameidata nd; 2568 int vfslocked; 2569 2570 AUDIT_ARG(mode, mode); 2571 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); 2572 if ((error = namei(&nd)) != 0) 2573 return (error); 2574 vfslocked = NDHASGIANT(&nd); 2575 NDFREE(&nd, NDF_ONLY_PNBUF); 2576 error = setfmode(td, nd.ni_vp, mode); 2577 vrele(nd.ni_vp); 2578 VFS_UNLOCK_GIANT(vfslocked); 2579 return (error); 2580 } 2581 2582 /* 2583 * Change mode of a file given path name (don't follow links.) 2584 */ 2585 #ifndef _SYS_SYSPROTO_H_ 2586 struct lchmod_args { 2587 char *path; 2588 int mode; 2589 }; 2590 #endif 2591 int 2592 lchmod(td, uap) 2593 struct thread *td; 2594 register struct lchmod_args /* { 2595 char *path; 2596 int mode; 2597 } */ *uap; 2598 { 2599 int error; 2600 struct nameidata nd; 2601 int vfslocked; 2602 2603 AUDIT_ARG(mode, (mode_t)uap->mode); 2604 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE, 2605 uap->path, td); 2606 if ((error = namei(&nd)) != 0) 2607 return (error); 2608 vfslocked = NDHASGIANT(&nd); 2609 NDFREE(&nd, NDF_ONLY_PNBUF); 2610 error = setfmode(td, nd.ni_vp, uap->mode); 2611 vrele(nd.ni_vp); 2612 VFS_UNLOCK_GIANT(vfslocked); 2613 return (error); 2614 } 2615 2616 /* 2617 * Change mode of a file given a file descriptor. 2618 */ 2619 #ifndef _SYS_SYSPROTO_H_ 2620 struct fchmod_args { 2621 int fd; 2622 int mode; 2623 }; 2624 #endif 2625 int 2626 fchmod(td, uap) 2627 struct thread *td; 2628 register struct fchmod_args /* { 2629 int fd; 2630 int mode; 2631 } */ *uap; 2632 { 2633 struct file *fp; 2634 int vfslocked; 2635 int error; 2636 2637 AUDIT_ARG(fd, uap->fd); 2638 AUDIT_ARG(mode, uap->mode); 2639 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 2640 return (error); 2641 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); 2642 #ifdef AUDIT 2643 vn_lock(fp->f_vnode, LK_EXCLUSIVE | LK_RETRY); 2644 AUDIT_ARG(vnode, fp->f_vnode, ARG_VNODE1); 2645 VOP_UNLOCK(fp->f_vnode, 0); 2646 #endif 2647 error = setfmode(td, fp->f_vnode, uap->mode); 2648 VFS_UNLOCK_GIANT(vfslocked); 2649 fdrop(fp, td); 2650 return (error); 2651 } 2652 2653 /* 2654 * Common implementation for chown(), lchown(), and fchown() 2655 */ 2656 static int 2657 setfown(td, vp, uid, gid) 2658 struct thread *td; 2659 struct vnode *vp; 2660 uid_t uid; 2661 gid_t gid; 2662 { 2663 int error; 2664 struct mount *mp; 2665 struct vattr vattr; 2666 2667 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2668 return (error); 2669 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2670 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2671 VATTR_NULL(&vattr); 2672 vattr.va_uid = uid; 2673 vattr.va_gid = gid; 2674 #ifdef MAC 2675 error = mac_vnode_check_setowner(td->td_ucred, vp, vattr.va_uid, 2676 vattr.va_gid); 2677 if (error == 0) 2678 #endif 2679 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 2680 VOP_UNLOCK(vp, 0); 2681 vn_finished_write(mp); 2682 return (error); 2683 } 2684 2685 /* 2686 * Set ownership given a path name. 2687 */ 2688 #ifndef _SYS_SYSPROTO_H_ 2689 struct chown_args { 2690 char *path; 2691 int uid; 2692 int gid; 2693 }; 2694 #endif 2695 int 2696 chown(td, uap) 2697 struct thread *td; 2698 register struct chown_args /* { 2699 char *path; 2700 int uid; 2701 int gid; 2702 } */ *uap; 2703 { 2704 2705 return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid)); 2706 } 2707 2708 int 2709 kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid, 2710 int gid) 2711 { 2712 int error; 2713 struct nameidata nd; 2714 int vfslocked; 2715 2716 AUDIT_ARG(owner, uid, gid); 2717 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); 2718 if ((error = namei(&nd)) != 0) 2719 return (error); 2720 vfslocked = NDHASGIANT(&nd); 2721 NDFREE(&nd, NDF_ONLY_PNBUF); 2722 error = setfown(td, nd.ni_vp, uid, gid); 2723 vrele(nd.ni_vp); 2724 VFS_UNLOCK_GIANT(vfslocked); 2725 return (error); 2726 } 2727 2728 /* 2729 * Set ownership given a path name, do not cross symlinks. 2730 */ 2731 #ifndef _SYS_SYSPROTO_H_ 2732 struct lchown_args { 2733 char *path; 2734 int uid; 2735 int gid; 2736 }; 2737 #endif 2738 int 2739 lchown(td, uap) 2740 struct thread *td; 2741 register struct lchown_args /* { 2742 char *path; 2743 int uid; 2744 int gid; 2745 } */ *uap; 2746 { 2747 2748 return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid)); 2749 } 2750 2751 int 2752 kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid, 2753 int gid) 2754 { 2755 int error; 2756 struct nameidata nd; 2757 int vfslocked; 2758 2759 AUDIT_ARG(owner, uid, gid); 2760 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); 2761 if ((error = namei(&nd)) != 0) 2762 return (error); 2763 vfslocked = NDHASGIANT(&nd); 2764 NDFREE(&nd, NDF_ONLY_PNBUF); 2765 error = setfown(td, nd.ni_vp, uid, gid); 2766 vrele(nd.ni_vp); 2767 VFS_UNLOCK_GIANT(vfslocked); 2768 return (error); 2769 } 2770 2771 /* 2772 * Set ownership given a file descriptor. 2773 */ 2774 #ifndef _SYS_SYSPROTO_H_ 2775 struct fchown_args { 2776 int fd; 2777 int uid; 2778 int gid; 2779 }; 2780 #endif 2781 int 2782 fchown(td, uap) 2783 struct thread *td; 2784 register struct fchown_args /* { 2785 int fd; 2786 int uid; 2787 int gid; 2788 } */ *uap; 2789 { 2790 struct file *fp; 2791 int vfslocked; 2792 int error; 2793 2794 AUDIT_ARG(fd, uap->fd); 2795 AUDIT_ARG(owner, uap->uid, uap->gid); 2796 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 2797 return (error); 2798 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); 2799 #ifdef AUDIT 2800 vn_lock(fp->f_vnode, LK_EXCLUSIVE | LK_RETRY); 2801 AUDIT_ARG(vnode, fp->f_vnode, ARG_VNODE1); 2802 VOP_UNLOCK(fp->f_vnode, 0); 2803 #endif 2804 error = setfown(td, fp->f_vnode, uap->uid, uap->gid); 2805 VFS_UNLOCK_GIANT(vfslocked); 2806 fdrop(fp, td); 2807 return (error); 2808 } 2809 2810 /* 2811 * Common implementation code for utimes(), lutimes(), and futimes(). 2812 */ 2813 static int 2814 getutimes(usrtvp, tvpseg, tsp) 2815 const struct timeval *usrtvp; 2816 enum uio_seg tvpseg; 2817 struct timespec *tsp; 2818 { 2819 struct timeval tv[2]; 2820 const struct timeval *tvp; 2821 int error; 2822 2823 if (usrtvp == NULL) { 2824 microtime(&tv[0]); 2825 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); 2826 tsp[1] = tsp[0]; 2827 } else { 2828 if (tvpseg == UIO_SYSSPACE) { 2829 tvp = usrtvp; 2830 } else { 2831 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 2832 return (error); 2833 tvp = tv; 2834 } 2835 2836 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 2837 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 2838 return (EINVAL); 2839 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 2840 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 2841 } 2842 return (0); 2843 } 2844 2845 /* 2846 * Common implementation code for utimes(), lutimes(), and futimes(). 2847 */ 2848 static int 2849 setutimes(td, vp, ts, numtimes, nullflag) 2850 struct thread *td; 2851 struct vnode *vp; 2852 const struct timespec *ts; 2853 int numtimes; 2854 int nullflag; 2855 { 2856 int error, setbirthtime; 2857 struct mount *mp; 2858 struct vattr vattr; 2859 2860 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2861 return (error); 2862 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2863 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2864 setbirthtime = 0; 2865 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred, td) == 0 && 2866 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 2867 setbirthtime = 1; 2868 VATTR_NULL(&vattr); 2869 vattr.va_atime = ts[0]; 2870 vattr.va_mtime = ts[1]; 2871 if (setbirthtime) 2872 vattr.va_birthtime = ts[1]; 2873 if (numtimes > 2) 2874 vattr.va_birthtime = ts[2]; 2875 if (nullflag) 2876 vattr.va_vaflags |= VA_UTIMES_NULL; 2877 #ifdef MAC 2878 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 2879 vattr.va_mtime); 2880 #endif 2881 if (error == 0) 2882 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 2883 VOP_UNLOCK(vp, 0); 2884 vn_finished_write(mp); 2885 return (error); 2886 } 2887 2888 /* 2889 * Set the access and modification times of a file. 2890 */ 2891 #ifndef _SYS_SYSPROTO_H_ 2892 struct utimes_args { 2893 char *path; 2894 struct timeval *tptr; 2895 }; 2896 #endif 2897 int 2898 utimes(td, uap) 2899 struct thread *td; 2900 register struct utimes_args /* { 2901 char *path; 2902 struct timeval *tptr; 2903 } */ *uap; 2904 { 2905 2906 return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr, 2907 UIO_USERSPACE)); 2908 } 2909 2910 int 2911 kern_utimes(struct thread *td, char *path, enum uio_seg pathseg, 2912 struct timeval *tptr, enum uio_seg tptrseg) 2913 { 2914 struct timespec ts[2]; 2915 int error; 2916 struct nameidata nd; 2917 int vfslocked; 2918 2919 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 2920 return (error); 2921 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); 2922 if ((error = namei(&nd)) != 0) 2923 return (error); 2924 vfslocked = NDHASGIANT(&nd); 2925 NDFREE(&nd, NDF_ONLY_PNBUF); 2926 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 2927 vrele(nd.ni_vp); 2928 VFS_UNLOCK_GIANT(vfslocked); 2929 return (error); 2930 } 2931 2932 /* 2933 * Set the access and modification times of a file. 2934 */ 2935 #ifndef _SYS_SYSPROTO_H_ 2936 struct lutimes_args { 2937 char *path; 2938 struct timeval *tptr; 2939 }; 2940 #endif 2941 int 2942 lutimes(td, uap) 2943 struct thread *td; 2944 register struct lutimes_args /* { 2945 char *path; 2946 struct timeval *tptr; 2947 } */ *uap; 2948 { 2949 2950 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 2951 UIO_USERSPACE)); 2952 } 2953 2954 int 2955 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, 2956 struct timeval *tptr, enum uio_seg tptrseg) 2957 { 2958 struct timespec ts[2]; 2959 int error; 2960 struct nameidata nd; 2961 int vfslocked; 2962 2963 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 2964 return (error); 2965 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); 2966 if ((error = namei(&nd)) != 0) 2967 return (error); 2968 vfslocked = NDHASGIANT(&nd); 2969 NDFREE(&nd, NDF_ONLY_PNBUF); 2970 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 2971 vrele(nd.ni_vp); 2972 VFS_UNLOCK_GIANT(vfslocked); 2973 return (error); 2974 } 2975 2976 /* 2977 * Set the access and modification times of a file. 2978 */ 2979 #ifndef _SYS_SYSPROTO_H_ 2980 struct futimes_args { 2981 int fd; 2982 struct timeval *tptr; 2983 }; 2984 #endif 2985 int 2986 futimes(td, uap) 2987 struct thread *td; 2988 register struct futimes_args /* { 2989 int fd; 2990 struct timeval *tptr; 2991 } */ *uap; 2992 { 2993 2994 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 2995 } 2996 2997 int 2998 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 2999 enum uio_seg tptrseg) 3000 { 3001 struct timespec ts[2]; 3002 struct file *fp; 3003 int vfslocked; 3004 int error; 3005 3006 AUDIT_ARG(fd, fd); 3007 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3008 return (error); 3009 if ((error = getvnode(td->td_proc->p_fd, fd, &fp)) != 0) 3010 return (error); 3011 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); 3012 #ifdef AUDIT 3013 vn_lock(fp->f_vnode, LK_EXCLUSIVE | LK_RETRY); 3014 AUDIT_ARG(vnode, fp->f_vnode, ARG_VNODE1); 3015 VOP_UNLOCK(fp->f_vnode, 0); 3016 #endif 3017 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3018 VFS_UNLOCK_GIANT(vfslocked); 3019 fdrop(fp, td); 3020 return (error); 3021 } 3022 3023 /* 3024 * Truncate a file given its path name. 3025 */ 3026 #ifndef _SYS_SYSPROTO_H_ 3027 struct truncate_args { 3028 char *path; 3029 int pad; 3030 off_t length; 3031 }; 3032 #endif 3033 int 3034 truncate(td, uap) 3035 struct thread *td; 3036 register struct truncate_args /* { 3037 char *path; 3038 int pad; 3039 off_t length; 3040 } */ *uap; 3041 { 3042 3043 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3044 } 3045 3046 int 3047 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) 3048 { 3049 struct mount *mp; 3050 struct vnode *vp; 3051 struct vattr vattr; 3052 int error; 3053 struct nameidata nd; 3054 int vfslocked; 3055 3056 if (length < 0) 3057 return(EINVAL); 3058 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); 3059 if ((error = namei(&nd)) != 0) 3060 return (error); 3061 vfslocked = NDHASGIANT(&nd); 3062 vp = nd.ni_vp; 3063 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3064 vrele(vp); 3065 VFS_UNLOCK_GIANT(vfslocked); 3066 return (error); 3067 } 3068 NDFREE(&nd, NDF_ONLY_PNBUF); 3069 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 3070 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3071 if (vp->v_type == VDIR) 3072 error = EISDIR; 3073 #ifdef MAC 3074 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3075 } 3076 #endif 3077 else if ((error = vn_writechk(vp)) == 0 && 3078 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3079 VATTR_NULL(&vattr); 3080 vattr.va_size = length; 3081 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 3082 } 3083 vput(vp); 3084 vn_finished_write(mp); 3085 VFS_UNLOCK_GIANT(vfslocked); 3086 return (error); 3087 } 3088 3089 #if defined(COMPAT_43) 3090 /* 3091 * Truncate a file given its path name. 3092 */ 3093 #ifndef _SYS_SYSPROTO_H_ 3094 struct otruncate_args { 3095 char *path; 3096 long length; 3097 }; 3098 #endif 3099 int 3100 otruncate(td, uap) 3101 struct thread *td; 3102 register struct otruncate_args /* { 3103 char *path; 3104 long length; 3105 } */ *uap; 3106 { 3107 struct truncate_args /* { 3108 char *path; 3109 int pad; 3110 off_t length; 3111 } */ nuap; 3112 3113 nuap.path = uap->path; 3114 nuap.length = uap->length; 3115 return (truncate(td, &nuap)); 3116 } 3117 #endif /* COMPAT_43 */ 3118 3119 /* Versions with the pad argument */ 3120 int 3121 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3122 { 3123 struct truncate_args ouap; 3124 3125 ouap.path = uap->path; 3126 ouap.length = uap->length; 3127 return (truncate(td, &ouap)); 3128 } 3129 3130 int 3131 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3132 { 3133 struct ftruncate_args ouap; 3134 3135 ouap.fd = uap->fd; 3136 ouap.length = uap->length; 3137 return (ftruncate(td, &ouap)); 3138 } 3139 3140 /* 3141 * Sync an open file. 3142 */ 3143 #ifndef _SYS_SYSPROTO_H_ 3144 struct fsync_args { 3145 int fd; 3146 }; 3147 #endif 3148 int 3149 fsync(td, uap) 3150 struct thread *td; 3151 struct fsync_args /* { 3152 int fd; 3153 } */ *uap; 3154 { 3155 struct vnode *vp; 3156 struct mount *mp; 3157 struct file *fp; 3158 int vfslocked; 3159 int error; 3160 3161 AUDIT_ARG(fd, uap->fd); 3162 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 3163 return (error); 3164 vp = fp->f_vnode; 3165 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 3166 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3167 goto drop; 3168 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3169 AUDIT_ARG(vnode, vp, ARG_VNODE1); 3170 if (vp->v_object != NULL) { 3171 VM_OBJECT_LOCK(vp->v_object); 3172 vm_object_page_clean(vp->v_object, 0, 0, 0); 3173 VM_OBJECT_UNLOCK(vp->v_object); 3174 } 3175 error = VOP_FSYNC(vp, MNT_WAIT, td); 3176 3177 VOP_UNLOCK(vp, 0); 3178 vn_finished_write(mp); 3179 drop: 3180 VFS_UNLOCK_GIANT(vfslocked); 3181 fdrop(fp, td); 3182 return (error); 3183 } 3184 3185 /* 3186 * Rename files. Source and destination must either both be directories, or 3187 * both not be directories. If target is a directory, it must be empty. 3188 */ 3189 #ifndef _SYS_SYSPROTO_H_ 3190 struct rename_args { 3191 char *from; 3192 char *to; 3193 }; 3194 #endif 3195 int 3196 rename(td, uap) 3197 struct thread *td; 3198 register struct rename_args /* { 3199 char *from; 3200 char *to; 3201 } */ *uap; 3202 { 3203 3204 return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE)); 3205 } 3206 3207 int 3208 kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg) 3209 { 3210 struct mount *mp = NULL; 3211 struct vnode *tvp, *fvp, *tdvp; 3212 struct nameidata fromnd, tond; 3213 int tvfslocked; 3214 int fvfslocked; 3215 int error; 3216 3217 bwillwrite(); 3218 #ifdef MAC 3219 NDINIT(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | MPSAFE | 3220 AUDITVNODE1, pathseg, from, td); 3221 #else 3222 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART | MPSAFE | 3223 AUDITVNODE1, pathseg, from, td); 3224 #endif 3225 if ((error = namei(&fromnd)) != 0) 3226 return (error); 3227 fvfslocked = NDHASGIANT(&fromnd); 3228 tvfslocked = 0; 3229 #ifdef MAC 3230 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3231 fromnd.ni_vp, &fromnd.ni_cnd); 3232 VOP_UNLOCK(fromnd.ni_dvp, 0); 3233 if (fromnd.ni_dvp != fromnd.ni_vp) 3234 VOP_UNLOCK(fromnd.ni_vp, 0); 3235 #endif 3236 fvp = fromnd.ni_vp; 3237 if (error == 0) 3238 error = vn_start_write(fvp, &mp, V_WAIT | PCATCH); 3239 if (error != 0) { 3240 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3241 vrele(fromnd.ni_dvp); 3242 vrele(fvp); 3243 goto out1; 3244 } 3245 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | 3246 MPSAFE | AUDITVNODE2, pathseg, to, td); 3247 if (fromnd.ni_vp->v_type == VDIR) 3248 tond.ni_cnd.cn_flags |= WILLBEDIR; 3249 if ((error = namei(&tond)) != 0) { 3250 /* Translate error code for rename("dir1", "dir2/."). */ 3251 if (error == EISDIR && fvp->v_type == VDIR) 3252 error = EINVAL; 3253 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3254 vrele(fromnd.ni_dvp); 3255 vrele(fvp); 3256 vn_finished_write(mp); 3257 goto out1; 3258 } 3259 tvfslocked = NDHASGIANT(&tond); 3260 tdvp = tond.ni_dvp; 3261 tvp = tond.ni_vp; 3262 if (tvp != NULL) { 3263 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3264 error = ENOTDIR; 3265 goto out; 3266 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3267 error = EISDIR; 3268 goto out; 3269 } 3270 } 3271 if (fvp == tdvp) 3272 error = EINVAL; 3273 /* 3274 * If the source is the same as the destination (that is, if they 3275 * are links to the same vnode), then there is nothing to do. 3276 */ 3277 if (fvp == tvp) 3278 error = -1; 3279 #ifdef MAC 3280 else 3281 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3282 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3283 #endif 3284 out: 3285 if (!error) { 3286 VOP_LEASE(tdvp, td, td->td_ucred, LEASE_WRITE); 3287 if (fromnd.ni_dvp != tdvp) { 3288 VOP_LEASE(fromnd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 3289 } 3290 if (tvp) { 3291 VOP_LEASE(tvp, td, td->td_ucred, LEASE_WRITE); 3292 } 3293 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3294 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3295 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3296 NDFREE(&tond, NDF_ONLY_PNBUF); 3297 } else { 3298 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3299 NDFREE(&tond, NDF_ONLY_PNBUF); 3300 if (tvp) 3301 vput(tvp); 3302 if (tdvp == tvp) 3303 vrele(tdvp); 3304 else 3305 vput(tdvp); 3306 vrele(fromnd.ni_dvp); 3307 vrele(fvp); 3308 } 3309 vrele(tond.ni_startdir); 3310 vn_finished_write(mp); 3311 out1: 3312 if (fromnd.ni_startdir) 3313 vrele(fromnd.ni_startdir); 3314 VFS_UNLOCK_GIANT(fvfslocked); 3315 VFS_UNLOCK_GIANT(tvfslocked); 3316 if (error == -1) 3317 return (0); 3318 return (error); 3319 } 3320 3321 /* 3322 * Make a directory file. 3323 */ 3324 #ifndef _SYS_SYSPROTO_H_ 3325 struct mkdir_args { 3326 char *path; 3327 int mode; 3328 }; 3329 #endif 3330 int 3331 mkdir(td, uap) 3332 struct thread *td; 3333 register struct mkdir_args /* { 3334 char *path; 3335 int mode; 3336 } */ *uap; 3337 { 3338 3339 return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode)); 3340 } 3341 3342 int 3343 kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode) 3344 { 3345 struct mount *mp; 3346 struct vnode *vp; 3347 struct vattr vattr; 3348 int error; 3349 struct nameidata nd; 3350 int vfslocked; 3351 3352 AUDIT_ARG(mode, mode); 3353 restart: 3354 bwillwrite(); 3355 NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, 3356 segflg, path, td); 3357 nd.ni_cnd.cn_flags |= WILLBEDIR; 3358 if ((error = namei(&nd)) != 0) 3359 return (error); 3360 vfslocked = NDHASGIANT(&nd); 3361 vp = nd.ni_vp; 3362 if (vp != NULL) { 3363 NDFREE(&nd, NDF_ONLY_PNBUF); 3364 /* 3365 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3366 * the strange behaviour of leaving the vnode unlocked 3367 * if the target is the same vnode as the parent. 3368 */ 3369 if (vp == nd.ni_dvp) 3370 vrele(nd.ni_dvp); 3371 else 3372 vput(nd.ni_dvp); 3373 vrele(vp); 3374 VFS_UNLOCK_GIANT(vfslocked); 3375 return (EEXIST); 3376 } 3377 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3378 NDFREE(&nd, NDF_ONLY_PNBUF); 3379 vput(nd.ni_dvp); 3380 VFS_UNLOCK_GIANT(vfslocked); 3381 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3382 return (error); 3383 goto restart; 3384 } 3385 VATTR_NULL(&vattr); 3386 vattr.va_type = VDIR; 3387 FILEDESC_SLOCK(td->td_proc->p_fd); 3388 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3389 FILEDESC_SUNLOCK(td->td_proc->p_fd); 3390 #ifdef MAC 3391 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3392 &vattr); 3393 if (error) 3394 goto out; 3395 #endif 3396 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 3397 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3398 #ifdef MAC 3399 out: 3400 #endif 3401 NDFREE(&nd, NDF_ONLY_PNBUF); 3402 vput(nd.ni_dvp); 3403 if (!error) 3404 vput(nd.ni_vp); 3405 vn_finished_write(mp); 3406 VFS_UNLOCK_GIANT(vfslocked); 3407 return (error); 3408 } 3409 3410 /* 3411 * Remove a directory file. 3412 */ 3413 #ifndef _SYS_SYSPROTO_H_ 3414 struct rmdir_args { 3415 char *path; 3416 }; 3417 #endif 3418 int 3419 rmdir(td, uap) 3420 struct thread *td; 3421 struct rmdir_args /* { 3422 char *path; 3423 } */ *uap; 3424 { 3425 3426 return (kern_rmdir(td, uap->path, UIO_USERSPACE)); 3427 } 3428 3429 int 3430 kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg) 3431 { 3432 struct mount *mp; 3433 struct vnode *vp; 3434 int error; 3435 struct nameidata nd; 3436 int vfslocked; 3437 3438 restart: 3439 bwillwrite(); 3440 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | AUDITVNODE1, 3441 pathseg, path, td); 3442 if ((error = namei(&nd)) != 0) 3443 return (error); 3444 vfslocked = NDHASGIANT(&nd); 3445 vp = nd.ni_vp; 3446 if (vp->v_type != VDIR) { 3447 error = ENOTDIR; 3448 goto out; 3449 } 3450 /* 3451 * No rmdir "." please. 3452 */ 3453 if (nd.ni_dvp == vp) { 3454 error = EINVAL; 3455 goto out; 3456 } 3457 /* 3458 * The root of a mounted filesystem cannot be deleted. 3459 */ 3460 if (vp->v_vflag & VV_ROOT) { 3461 error = EBUSY; 3462 goto out; 3463 } 3464 #ifdef MAC 3465 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3466 &nd.ni_cnd); 3467 if (error) 3468 goto out; 3469 #endif 3470 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3471 NDFREE(&nd, NDF_ONLY_PNBUF); 3472 vput(vp); 3473 if (nd.ni_dvp == vp) 3474 vrele(nd.ni_dvp); 3475 else 3476 vput(nd.ni_dvp); 3477 VFS_UNLOCK_GIANT(vfslocked); 3478 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3479 return (error); 3480 goto restart; 3481 } 3482 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 3483 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 3484 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3485 vn_finished_write(mp); 3486 out: 3487 NDFREE(&nd, NDF_ONLY_PNBUF); 3488 vput(vp); 3489 if (nd.ni_dvp == vp) 3490 vrele(nd.ni_dvp); 3491 else 3492 vput(nd.ni_dvp); 3493 VFS_UNLOCK_GIANT(vfslocked); 3494 return (error); 3495 } 3496 3497 #ifdef COMPAT_43 3498 /* 3499 * Read a block of directory entries in a filesystem independent format. 3500 */ 3501 #ifndef _SYS_SYSPROTO_H_ 3502 struct ogetdirentries_args { 3503 int fd; 3504 char *buf; 3505 u_int count; 3506 long *basep; 3507 }; 3508 #endif 3509 int 3510 ogetdirentries(td, uap) 3511 struct thread *td; 3512 register struct ogetdirentries_args /* { 3513 int fd; 3514 char *buf; 3515 u_int count; 3516 long *basep; 3517 } */ *uap; 3518 { 3519 struct vnode *vp; 3520 struct file *fp; 3521 struct uio auio, kuio; 3522 struct iovec aiov, kiov; 3523 struct dirent *dp, *edp; 3524 caddr_t dirbuf; 3525 int error, eofflag, readcnt, vfslocked; 3526 long loff; 3527 3528 /* XXX arbitrary sanity limit on `count'. */ 3529 if (uap->count > 64 * 1024) 3530 return (EINVAL); 3531 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 3532 return (error); 3533 if ((fp->f_flag & FREAD) == 0) { 3534 fdrop(fp, td); 3535 return (EBADF); 3536 } 3537 vp = fp->f_vnode; 3538 unionread: 3539 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 3540 if (vp->v_type != VDIR) { 3541 VFS_UNLOCK_GIANT(vfslocked); 3542 fdrop(fp, td); 3543 return (EINVAL); 3544 } 3545 aiov.iov_base = uap->buf; 3546 aiov.iov_len = uap->count; 3547 auio.uio_iov = &aiov; 3548 auio.uio_iovcnt = 1; 3549 auio.uio_rw = UIO_READ; 3550 auio.uio_segflg = UIO_USERSPACE; 3551 auio.uio_td = td; 3552 auio.uio_resid = uap->count; 3553 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3554 loff = auio.uio_offset = fp->f_offset; 3555 #ifdef MAC 3556 error = mac_vnode_check_readdir(td->td_ucred, vp); 3557 if (error) { 3558 VOP_UNLOCK(vp, 0); 3559 VFS_UNLOCK_GIANT(vfslocked); 3560 fdrop(fp, td); 3561 return (error); 3562 } 3563 #endif 3564 # if (BYTE_ORDER != LITTLE_ENDIAN) 3565 if (vp->v_mount->mnt_maxsymlinklen <= 0) { 3566 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 3567 NULL, NULL); 3568 fp->f_offset = auio.uio_offset; 3569 } else 3570 # endif 3571 { 3572 kuio = auio; 3573 kuio.uio_iov = &kiov; 3574 kuio.uio_segflg = UIO_SYSSPACE; 3575 kiov.iov_len = uap->count; 3576 MALLOC(dirbuf, caddr_t, uap->count, M_TEMP, M_WAITOK); 3577 kiov.iov_base = dirbuf; 3578 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 3579 NULL, NULL); 3580 fp->f_offset = kuio.uio_offset; 3581 if (error == 0) { 3582 readcnt = uap->count - kuio.uio_resid; 3583 edp = (struct dirent *)&dirbuf[readcnt]; 3584 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 3585 # if (BYTE_ORDER == LITTLE_ENDIAN) 3586 /* 3587 * The expected low byte of 3588 * dp->d_namlen is our dp->d_type. 3589 * The high MBZ byte of dp->d_namlen 3590 * is our dp->d_namlen. 3591 */ 3592 dp->d_type = dp->d_namlen; 3593 dp->d_namlen = 0; 3594 # else 3595 /* 3596 * The dp->d_type is the high byte 3597 * of the expected dp->d_namlen, 3598 * so must be zero'ed. 3599 */ 3600 dp->d_type = 0; 3601 # endif 3602 if (dp->d_reclen > 0) { 3603 dp = (struct dirent *) 3604 ((char *)dp + dp->d_reclen); 3605 } else { 3606 error = EIO; 3607 break; 3608 } 3609 } 3610 if (dp >= edp) 3611 error = uiomove(dirbuf, readcnt, &auio); 3612 } 3613 FREE(dirbuf, M_TEMP); 3614 } 3615 if (error) { 3616 VOP_UNLOCK(vp, 0); 3617 VFS_UNLOCK_GIANT(vfslocked); 3618 fdrop(fp, td); 3619 return (error); 3620 } 3621 if (uap->count == auio.uio_resid && 3622 (vp->v_vflag & VV_ROOT) && 3623 (vp->v_mount->mnt_flag & MNT_UNION)) { 3624 struct vnode *tvp = vp; 3625 vp = vp->v_mount->mnt_vnodecovered; 3626 VREF(vp); 3627 fp->f_vnode = vp; 3628 fp->f_data = vp; 3629 fp->f_offset = 0; 3630 vput(tvp); 3631 VFS_UNLOCK_GIANT(vfslocked); 3632 goto unionread; 3633 } 3634 VOP_UNLOCK(vp, 0); 3635 VFS_UNLOCK_GIANT(vfslocked); 3636 error = copyout(&loff, uap->basep, sizeof(long)); 3637 fdrop(fp, td); 3638 td->td_retval[0] = uap->count - auio.uio_resid; 3639 return (error); 3640 } 3641 #endif /* COMPAT_43 */ 3642 3643 /* 3644 * Read a block of directory entries in a filesystem independent format. 3645 */ 3646 #ifndef _SYS_SYSPROTO_H_ 3647 struct getdirentries_args { 3648 int fd; 3649 char *buf; 3650 u_int count; 3651 long *basep; 3652 }; 3653 #endif 3654 int 3655 getdirentries(td, uap) 3656 struct thread *td; 3657 register struct getdirentries_args /* { 3658 int fd; 3659 char *buf; 3660 u_int count; 3661 long *basep; 3662 } */ *uap; 3663 { 3664 struct vnode *vp; 3665 struct file *fp; 3666 struct uio auio; 3667 struct iovec aiov; 3668 int vfslocked; 3669 long loff; 3670 int error, eofflag; 3671 3672 AUDIT_ARG(fd, uap->fd); 3673 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 3674 return (error); 3675 if ((fp->f_flag & FREAD) == 0) { 3676 fdrop(fp, td); 3677 return (EBADF); 3678 } 3679 vp = fp->f_vnode; 3680 unionread: 3681 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 3682 if (vp->v_type != VDIR) { 3683 VFS_UNLOCK_GIANT(vfslocked); 3684 error = EINVAL; 3685 goto fail; 3686 } 3687 aiov.iov_base = uap->buf; 3688 aiov.iov_len = uap->count; 3689 auio.uio_iov = &aiov; 3690 auio.uio_iovcnt = 1; 3691 auio.uio_rw = UIO_READ; 3692 auio.uio_segflg = UIO_USERSPACE; 3693 auio.uio_td = td; 3694 auio.uio_resid = uap->count; 3695 /* vn_lock(vp, LK_SHARED | LK_RETRY); */ 3696 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3697 AUDIT_ARG(vnode, vp, ARG_VNODE1); 3698 loff = auio.uio_offset = fp->f_offset; 3699 #ifdef MAC 3700 error = mac_vnode_check_readdir(td->td_ucred, vp); 3701 if (error == 0) 3702 #endif 3703 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 3704 NULL); 3705 fp->f_offset = auio.uio_offset; 3706 if (error) { 3707 VOP_UNLOCK(vp, 0); 3708 VFS_UNLOCK_GIANT(vfslocked); 3709 goto fail; 3710 } 3711 if (uap->count == auio.uio_resid && 3712 (vp->v_vflag & VV_ROOT) && 3713 (vp->v_mount->mnt_flag & MNT_UNION)) { 3714 struct vnode *tvp = vp; 3715 vp = vp->v_mount->mnt_vnodecovered; 3716 VREF(vp); 3717 fp->f_vnode = vp; 3718 fp->f_data = vp; 3719 fp->f_offset = 0; 3720 vput(tvp); 3721 VFS_UNLOCK_GIANT(vfslocked); 3722 goto unionread; 3723 } 3724 VOP_UNLOCK(vp, 0); 3725 VFS_UNLOCK_GIANT(vfslocked); 3726 if (uap->basep != NULL) { 3727 error = copyout(&loff, uap->basep, sizeof(long)); 3728 } 3729 td->td_retval[0] = uap->count - auio.uio_resid; 3730 fail: 3731 fdrop(fp, td); 3732 return (error); 3733 } 3734 3735 #ifndef _SYS_SYSPROTO_H_ 3736 struct getdents_args { 3737 int fd; 3738 char *buf; 3739 size_t count; 3740 }; 3741 #endif 3742 int 3743 getdents(td, uap) 3744 struct thread *td; 3745 register struct getdents_args /* { 3746 int fd; 3747 char *buf; 3748 u_int count; 3749 } */ *uap; 3750 { 3751 struct getdirentries_args ap; 3752 ap.fd = uap->fd; 3753 ap.buf = uap->buf; 3754 ap.count = uap->count; 3755 ap.basep = NULL; 3756 return (getdirentries(td, &ap)); 3757 } 3758 3759 /* 3760 * Set the mode mask for creation of filesystem nodes. 3761 */ 3762 #ifndef _SYS_SYSPROTO_H_ 3763 struct umask_args { 3764 int newmask; 3765 }; 3766 #endif 3767 int 3768 umask(td, uap) 3769 struct thread *td; 3770 struct umask_args /* { 3771 int newmask; 3772 } */ *uap; 3773 { 3774 register struct filedesc *fdp; 3775 3776 FILEDESC_XLOCK(td->td_proc->p_fd); 3777 fdp = td->td_proc->p_fd; 3778 td->td_retval[0] = fdp->fd_cmask; 3779 fdp->fd_cmask = uap->newmask & ALLPERMS; 3780 FILEDESC_XUNLOCK(td->td_proc->p_fd); 3781 return (0); 3782 } 3783 3784 /* 3785 * Void all references to file by ripping underlying filesystem away from 3786 * vnode. 3787 */ 3788 #ifndef _SYS_SYSPROTO_H_ 3789 struct revoke_args { 3790 char *path; 3791 }; 3792 #endif 3793 int 3794 revoke(td, uap) 3795 struct thread *td; 3796 register struct revoke_args /* { 3797 char *path; 3798 } */ *uap; 3799 { 3800 struct vnode *vp; 3801 struct vattr vattr; 3802 int error; 3803 struct nameidata nd; 3804 int vfslocked; 3805 3806 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 3807 UIO_USERSPACE, uap->path, td); 3808 if ((error = namei(&nd)) != 0) 3809 return (error); 3810 vfslocked = NDHASGIANT(&nd); 3811 vp = nd.ni_vp; 3812 NDFREE(&nd, NDF_ONLY_PNBUF); 3813 if (vp->v_type != VCHR) { 3814 error = EINVAL; 3815 goto out; 3816 } 3817 #ifdef MAC 3818 error = mac_vnode_check_revoke(td->td_ucred, vp); 3819 if (error) 3820 goto out; 3821 #endif 3822 error = VOP_GETATTR(vp, &vattr, td->td_ucred, td); 3823 if (error) 3824 goto out; 3825 if (td->td_ucred->cr_uid != vattr.va_uid) { 3826 error = priv_check(td, PRIV_VFS_ADMIN); 3827 if (error) 3828 goto out; 3829 } 3830 if (vcount(vp) > 1) 3831 VOP_REVOKE(vp, REVOKEALL); 3832 out: 3833 vput(vp); 3834 VFS_UNLOCK_GIANT(vfslocked); 3835 return (error); 3836 } 3837 3838 /* 3839 * Convert a user file descriptor to a kernel file entry. 3840 * A reference on the file entry is held upon returning. 3841 */ 3842 int 3843 getvnode(fdp, fd, fpp) 3844 struct filedesc *fdp; 3845 int fd; 3846 struct file **fpp; 3847 { 3848 int error; 3849 struct file *fp; 3850 3851 fp = NULL; 3852 if (fdp == NULL) 3853 error = EBADF; 3854 else { 3855 FILEDESC_SLOCK(fdp); 3856 if ((u_int)fd >= fdp->fd_nfiles || 3857 (fp = fdp->fd_ofiles[fd]) == NULL) 3858 error = EBADF; 3859 else if (fp->f_vnode == NULL) { 3860 fp = NULL; 3861 error = EINVAL; 3862 } else { 3863 fhold(fp); 3864 error = 0; 3865 } 3866 FILEDESC_SUNLOCK(fdp); 3867 } 3868 *fpp = fp; 3869 return (error); 3870 } 3871 3872 /* 3873 * Get an (NFS) file handle. 3874 */ 3875 #ifndef _SYS_SYSPROTO_H_ 3876 struct lgetfh_args { 3877 char *fname; 3878 fhandle_t *fhp; 3879 }; 3880 #endif 3881 int 3882 lgetfh(td, uap) 3883 struct thread *td; 3884 register struct lgetfh_args *uap; 3885 { 3886 struct nameidata nd; 3887 fhandle_t fh; 3888 register struct vnode *vp; 3889 int vfslocked; 3890 int error; 3891 3892 error = priv_check(td, PRIV_VFS_GETFH); 3893 if (error) 3894 return (error); 3895 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 3896 UIO_USERSPACE, uap->fname, td); 3897 error = namei(&nd); 3898 if (error) 3899 return (error); 3900 vfslocked = NDHASGIANT(&nd); 3901 NDFREE(&nd, NDF_ONLY_PNBUF); 3902 vp = nd.ni_vp; 3903 bzero(&fh, sizeof(fh)); 3904 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 3905 error = VOP_VPTOFH(vp, &fh.fh_fid); 3906 vput(vp); 3907 VFS_UNLOCK_GIANT(vfslocked); 3908 if (error) 3909 return (error); 3910 error = copyout(&fh, uap->fhp, sizeof (fh)); 3911 return (error); 3912 } 3913 3914 #ifndef _SYS_SYSPROTO_H_ 3915 struct getfh_args { 3916 char *fname; 3917 fhandle_t *fhp; 3918 }; 3919 #endif 3920 int 3921 getfh(td, uap) 3922 struct thread *td; 3923 register struct getfh_args *uap; 3924 { 3925 struct nameidata nd; 3926 fhandle_t fh; 3927 register struct vnode *vp; 3928 int vfslocked; 3929 int error; 3930 3931 error = priv_check(td, PRIV_VFS_GETFH); 3932 if (error) 3933 return (error); 3934 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 3935 UIO_USERSPACE, uap->fname, td); 3936 error = namei(&nd); 3937 if (error) 3938 return (error); 3939 vfslocked = NDHASGIANT(&nd); 3940 NDFREE(&nd, NDF_ONLY_PNBUF); 3941 vp = nd.ni_vp; 3942 bzero(&fh, sizeof(fh)); 3943 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 3944 error = VOP_VPTOFH(vp, &fh.fh_fid); 3945 vput(vp); 3946 VFS_UNLOCK_GIANT(vfslocked); 3947 if (error) 3948 return (error); 3949 error = copyout(&fh, uap->fhp, sizeof (fh)); 3950 return (error); 3951 } 3952 3953 /* 3954 * syscall for the rpc.lockd to use to translate a NFS file handle into an 3955 * open descriptor. 3956 * 3957 * warning: do not remove the priv_check() call or this becomes one giant 3958 * security hole. 3959 */ 3960 #ifndef _SYS_SYSPROTO_H_ 3961 struct fhopen_args { 3962 const struct fhandle *u_fhp; 3963 int flags; 3964 }; 3965 #endif 3966 int 3967 fhopen(td, uap) 3968 struct thread *td; 3969 struct fhopen_args /* { 3970 const struct fhandle *u_fhp; 3971 int flags; 3972 } */ *uap; 3973 { 3974 struct proc *p = td->td_proc; 3975 struct mount *mp; 3976 struct vnode *vp; 3977 struct fhandle fhp; 3978 struct vattr vat; 3979 struct vattr *vap = &vat; 3980 struct flock lf; 3981 struct file *fp; 3982 register struct filedesc *fdp = p->p_fd; 3983 int fmode, mode, error, type; 3984 struct file *nfp; 3985 int vfslocked; 3986 int indx; 3987 3988 error = priv_check(td, PRIV_VFS_FHOPEN); 3989 if (error) 3990 return (error); 3991 fmode = FFLAGS(uap->flags); 3992 /* why not allow a non-read/write open for our lockd? */ 3993 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 3994 return (EINVAL); 3995 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 3996 if (error) 3997 return(error); 3998 /* find the mount point */ 3999 mp = vfs_getvfs(&fhp.fh_fsid); 4000 if (mp == NULL) 4001 return (ESTALE); 4002 vfslocked = VFS_LOCK_GIANT(mp); 4003 /* now give me my vnode, it gets returned to me locked */ 4004 error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp); 4005 if (error) 4006 goto out; 4007 /* 4008 * from now on we have to make sure not 4009 * to forget about the vnode 4010 * any error that causes an abort must vput(vp) 4011 * just set error = err and 'goto bad;'. 4012 */ 4013 4014 /* 4015 * from vn_open 4016 */ 4017 if (vp->v_type == VLNK) { 4018 error = EMLINK; 4019 goto bad; 4020 } 4021 if (vp->v_type == VSOCK) { 4022 error = EOPNOTSUPP; 4023 goto bad; 4024 } 4025 mode = 0; 4026 if (fmode & (FWRITE | O_TRUNC)) { 4027 if (vp->v_type == VDIR) { 4028 error = EISDIR; 4029 goto bad; 4030 } 4031 error = vn_writechk(vp); 4032 if (error) 4033 goto bad; 4034 mode |= VWRITE; 4035 } 4036 if (fmode & FREAD) 4037 mode |= VREAD; 4038 if (fmode & O_APPEND) 4039 mode |= VAPPEND; 4040 #ifdef MAC 4041 error = mac_vnode_check_open(td->td_ucred, vp, mode); 4042 if (error) 4043 goto bad; 4044 #endif 4045 if (mode) { 4046 error = VOP_ACCESS(vp, mode, td->td_ucred, td); 4047 if (error) 4048 goto bad; 4049 } 4050 if (fmode & O_TRUNC) { 4051 VOP_UNLOCK(vp, 0); /* XXX */ 4052 if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) { 4053 vrele(vp); 4054 goto out; 4055 } 4056 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 4057 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 4058 #ifdef MAC 4059 /* 4060 * We don't yet have fp->f_cred, so use td->td_ucred, which 4061 * should be right. 4062 */ 4063 error = mac_vnode_check_write(td->td_ucred, td->td_ucred, vp); 4064 if (error == 0) { 4065 #endif 4066 VATTR_NULL(vap); 4067 vap->va_size = 0; 4068 error = VOP_SETATTR(vp, vap, td->td_ucred, td); 4069 #ifdef MAC 4070 } 4071 #endif 4072 vn_finished_write(mp); 4073 if (error) 4074 goto bad; 4075 } 4076 error = VOP_OPEN(vp, fmode, td->td_ucred, td, NULL); 4077 if (error) 4078 goto bad; 4079 4080 if (fmode & FWRITE) 4081 vp->v_writecount++; 4082 4083 /* 4084 * end of vn_open code 4085 */ 4086 4087 if ((error = falloc(td, &nfp, &indx)) != 0) { 4088 if (fmode & FWRITE) 4089 vp->v_writecount--; 4090 goto bad; 4091 } 4092 /* An extra reference on `nfp' has been held for us by falloc(). */ 4093 fp = nfp; 4094 nfp->f_vnode = vp; 4095 finit(nfp, fmode & FMASK, DTYPE_VNODE, vp, &vnops); 4096 if (fmode & (O_EXLOCK | O_SHLOCK)) { 4097 lf.l_whence = SEEK_SET; 4098 lf.l_start = 0; 4099 lf.l_len = 0; 4100 if (fmode & O_EXLOCK) 4101 lf.l_type = F_WRLCK; 4102 else 4103 lf.l_type = F_RDLCK; 4104 type = F_FLOCK; 4105 if ((fmode & FNONBLOCK) == 0) 4106 type |= F_WAIT; 4107 VOP_UNLOCK(vp, 0); 4108 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, 4109 type)) != 0) { 4110 /* 4111 * The lock request failed. Normally close the 4112 * descriptor but handle the case where someone might 4113 * have dup()d or close()d it when we weren't looking. 4114 */ 4115 fdclose(fdp, fp, indx, td); 4116 4117 /* 4118 * release our private reference 4119 */ 4120 fdrop(fp, td); 4121 goto out; 4122 } 4123 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4124 atomic_set_int(&fp->f_flag, FHASLOCK); 4125 } 4126 4127 VOP_UNLOCK(vp, 0); 4128 fdrop(fp, td); 4129 vfs_rel(mp); 4130 VFS_UNLOCK_GIANT(vfslocked); 4131 td->td_retval[0] = indx; 4132 return (0); 4133 4134 bad: 4135 vput(vp); 4136 out: 4137 vfs_rel(mp); 4138 VFS_UNLOCK_GIANT(vfslocked); 4139 return (error); 4140 } 4141 4142 /* 4143 * Stat an (NFS) file handle. 4144 */ 4145 #ifndef _SYS_SYSPROTO_H_ 4146 struct fhstat_args { 4147 struct fhandle *u_fhp; 4148 struct stat *sb; 4149 }; 4150 #endif 4151 int 4152 fhstat(td, uap) 4153 struct thread *td; 4154 register struct fhstat_args /* { 4155 struct fhandle *u_fhp; 4156 struct stat *sb; 4157 } */ *uap; 4158 { 4159 struct stat sb; 4160 fhandle_t fh; 4161 struct mount *mp; 4162 struct vnode *vp; 4163 int vfslocked; 4164 int error; 4165 4166 error = priv_check(td, PRIV_VFS_FHSTAT); 4167 if (error) 4168 return (error); 4169 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4170 if (error) 4171 return (error); 4172 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 4173 return (ESTALE); 4174 vfslocked = VFS_LOCK_GIANT(mp); 4175 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) { 4176 vfs_rel(mp); 4177 VFS_UNLOCK_GIANT(vfslocked); 4178 return (error); 4179 } 4180 error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td); 4181 vput(vp); 4182 vfs_rel(mp); 4183 VFS_UNLOCK_GIANT(vfslocked); 4184 if (error) 4185 return (error); 4186 error = copyout(&sb, uap->sb, sizeof(sb)); 4187 return (error); 4188 } 4189 4190 /* 4191 * Implement fstatfs() for (NFS) file handles. 4192 */ 4193 #ifndef _SYS_SYSPROTO_H_ 4194 struct fhstatfs_args { 4195 struct fhandle *u_fhp; 4196 struct statfs *buf; 4197 }; 4198 #endif 4199 int 4200 fhstatfs(td, uap) 4201 struct thread *td; 4202 struct fhstatfs_args /* { 4203 struct fhandle *u_fhp; 4204 struct statfs *buf; 4205 } */ *uap; 4206 { 4207 struct statfs sf; 4208 fhandle_t fh; 4209 int error; 4210 4211 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4212 if (error) 4213 return (error); 4214 error = kern_fhstatfs(td, fh, &sf); 4215 if (error) 4216 return (error); 4217 return (copyout(&sf, uap->buf, sizeof(sf))); 4218 } 4219 4220 int 4221 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4222 { 4223 struct statfs *sp; 4224 struct mount *mp; 4225 struct vnode *vp; 4226 int vfslocked; 4227 int error; 4228 4229 error = priv_check(td, PRIV_VFS_FHSTATFS); 4230 if (error) 4231 return (error); 4232 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 4233 return (ESTALE); 4234 vfslocked = VFS_LOCK_GIANT(mp); 4235 error = VFS_FHTOVP(mp, &fh.fh_fid, &vp); 4236 if (error) { 4237 VFS_UNLOCK_GIANT(vfslocked); 4238 vfs_rel(mp); 4239 return (error); 4240 } 4241 vput(vp); 4242 error = prison_canseemount(td->td_ucred, mp); 4243 if (error) 4244 goto out; 4245 #ifdef MAC 4246 error = mac_mount_check_stat(td->td_ucred, mp); 4247 if (error) 4248 goto out; 4249 #endif 4250 /* 4251 * Set these in case the underlying filesystem fails to do so. 4252 */ 4253 sp = &mp->mnt_stat; 4254 sp->f_version = STATFS_VERSION; 4255 sp->f_namemax = NAME_MAX; 4256 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 4257 error = VFS_STATFS(mp, sp, td); 4258 if (error == 0) 4259 *buf = *sp; 4260 out: 4261 vfs_rel(mp); 4262 VFS_UNLOCK_GIANT(vfslocked); 4263 return (error); 4264 } 4265