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_capsicum.h" 41 #include "opt_compat.h" 42 #include "opt_kdtrace.h" 43 #include "opt_ktrace.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/capability.h> 50 #include <sys/disk.h> 51 #include <sys/sysent.h> 52 #include <sys/malloc.h> 53 #include <sys/mount.h> 54 #include <sys/mutex.h> 55 #include <sys/sysproto.h> 56 #include <sys/namei.h> 57 #include <sys/filedesc.h> 58 #include <sys/kernel.h> 59 #include <sys/fcntl.h> 60 #include <sys/file.h> 61 #include <sys/filio.h> 62 #include <sys/limits.h> 63 #include <sys/linker.h> 64 #include <sys/sdt.h> 65 #include <sys/stat.h> 66 #include <sys/sx.h> 67 #include <sys/unistd.h> 68 #include <sys/vnode.h> 69 #include <sys/priv.h> 70 #include <sys/proc.h> 71 #include <sys/dirent.h> 72 #include <sys/jail.h> 73 #include <sys/syscallsubr.h> 74 #include <sys/sysctl.h> 75 #ifdef KTRACE 76 #include <sys/ktrace.h> 77 #endif 78 79 #include <machine/stdarg.h> 80 81 #include <security/audit/audit.h> 82 #include <security/mac/mac_framework.h> 83 84 #include <vm/vm.h> 85 #include <vm/vm_object.h> 86 #include <vm/vm_page.h> 87 #include <vm/uma.h> 88 89 static MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 90 91 SDT_PROVIDER_DEFINE(vfs); 92 SDT_PROBE_DEFINE(vfs, , stat, mode, mode); 93 SDT_PROBE_ARGTYPE(vfs, , stat, mode, 0, "char *"); 94 SDT_PROBE_ARGTYPE(vfs, , stat, mode, 1, "int"); 95 SDT_PROBE_DEFINE(vfs, , stat, reg, reg); 96 SDT_PROBE_ARGTYPE(vfs, , stat, reg, 0, "char *"); 97 SDT_PROBE_ARGTYPE(vfs, , stat, reg, 1, "int"); 98 99 static int chroot_refuse_vdir_fds(struct filedesc *fdp); 100 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 101 static int setfflags(struct thread *td, struct vnode *, int); 102 static int setutimes(struct thread *td, struct vnode *, 103 const struct timespec *, int, int); 104 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 105 struct thread *td); 106 107 /* 108 * The module initialization routine for POSIX asynchronous I/O will 109 * set this to the version of AIO that it implements. (Zero means 110 * that it is not implemented.) This value is used here by pathconf() 111 * and in kern_descrip.c by fpathconf(). 112 */ 113 int async_io_version; 114 115 #ifdef DEBUG 116 static int syncprt = 0; 117 SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); 118 #endif 119 120 /* 121 * Sync each mounted filesystem. 122 */ 123 #ifndef _SYS_SYSPROTO_H_ 124 struct sync_args { 125 int dummy; 126 }; 127 #endif 128 /* ARGSUSED */ 129 int 130 sys_sync(td, uap) 131 struct thread *td; 132 struct sync_args *uap; 133 { 134 struct mount *mp, *nmp; 135 int vfslocked; 136 137 mtx_lock(&mountlist_mtx); 138 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 139 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 140 nmp = TAILQ_NEXT(mp, mnt_list); 141 continue; 142 } 143 vfslocked = VFS_LOCK_GIANT(mp); 144 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 145 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 146 MNT_ILOCK(mp); 147 mp->mnt_noasync++; 148 mp->mnt_kern_flag &= ~MNTK_ASYNC; 149 MNT_IUNLOCK(mp); 150 vfs_msync(mp, MNT_NOWAIT); 151 VFS_SYNC(mp, MNT_NOWAIT); 152 MNT_ILOCK(mp); 153 mp->mnt_noasync--; 154 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 155 mp->mnt_noasync == 0) 156 mp->mnt_kern_flag |= MNTK_ASYNC; 157 MNT_IUNLOCK(mp); 158 vn_finished_write(mp); 159 } 160 VFS_UNLOCK_GIANT(vfslocked); 161 mtx_lock(&mountlist_mtx); 162 nmp = TAILQ_NEXT(mp, mnt_list); 163 vfs_unbusy(mp); 164 } 165 mtx_unlock(&mountlist_mtx); 166 return (0); 167 } 168 169 /* 170 * Change filesystem quotas. 171 */ 172 #ifndef _SYS_SYSPROTO_H_ 173 struct quotactl_args { 174 char *path; 175 int cmd; 176 int uid; 177 caddr_t arg; 178 }; 179 #endif 180 int 181 sys_quotactl(td, uap) 182 struct thread *td; 183 register struct quotactl_args /* { 184 char *path; 185 int cmd; 186 int uid; 187 caddr_t arg; 188 } */ *uap; 189 { 190 struct mount *mp; 191 int vfslocked; 192 int error; 193 struct nameidata nd; 194 195 AUDIT_ARG_CMD(uap->cmd); 196 AUDIT_ARG_UID(uap->uid); 197 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 198 return (EPERM); 199 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 200 UIO_USERSPACE, uap->path, td); 201 if ((error = namei(&nd)) != 0) 202 return (error); 203 vfslocked = NDHASGIANT(&nd); 204 NDFREE(&nd, NDF_ONLY_PNBUF); 205 mp = nd.ni_vp->v_mount; 206 vfs_ref(mp); 207 vput(nd.ni_vp); 208 error = vfs_busy(mp, 0); 209 vfs_rel(mp); 210 if (error) { 211 VFS_UNLOCK_GIANT(vfslocked); 212 return (error); 213 } 214 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); 215 vfs_unbusy(mp); 216 VFS_UNLOCK_GIANT(vfslocked); 217 return (error); 218 } 219 220 /* 221 * Used by statfs conversion routines to scale the block size up if 222 * necessary so that all of the block counts are <= 'max_size'. Note 223 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 224 * value of 'n'. 225 */ 226 void 227 statfs_scale_blocks(struct statfs *sf, long max_size) 228 { 229 uint64_t count; 230 int shift; 231 232 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 233 234 /* 235 * Attempt to scale the block counts to give a more accurate 236 * overview to userland of the ratio of free space to used 237 * space. To do this, find the largest block count and compute 238 * a divisor that lets it fit into a signed integer <= max_size. 239 */ 240 if (sf->f_bavail < 0) 241 count = -sf->f_bavail; 242 else 243 count = sf->f_bavail; 244 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 245 if (count <= max_size) 246 return; 247 248 count >>= flsl(max_size); 249 shift = 0; 250 while (count > 0) { 251 shift++; 252 count >>=1; 253 } 254 255 sf->f_bsize <<= shift; 256 sf->f_blocks >>= shift; 257 sf->f_bfree >>= shift; 258 sf->f_bavail >>= shift; 259 } 260 261 /* 262 * Get filesystem statistics. 263 */ 264 #ifndef _SYS_SYSPROTO_H_ 265 struct statfs_args { 266 char *path; 267 struct statfs *buf; 268 }; 269 #endif 270 int 271 sys_statfs(td, uap) 272 struct thread *td; 273 register struct statfs_args /* { 274 char *path; 275 struct statfs *buf; 276 } */ *uap; 277 { 278 struct statfs sf; 279 int error; 280 281 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf); 282 if (error == 0) 283 error = copyout(&sf, uap->buf, sizeof(sf)); 284 return (error); 285 } 286 287 int 288 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg, 289 struct statfs *buf) 290 { 291 struct mount *mp; 292 struct statfs *sp, sb; 293 int vfslocked; 294 int error; 295 struct nameidata nd; 296 297 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | 298 AUDITVNODE1, pathseg, path, td); 299 error = namei(&nd); 300 if (error) 301 return (error); 302 vfslocked = NDHASGIANT(&nd); 303 mp = nd.ni_vp->v_mount; 304 vfs_ref(mp); 305 NDFREE(&nd, NDF_ONLY_PNBUF); 306 vput(nd.ni_vp); 307 error = vfs_busy(mp, 0); 308 vfs_rel(mp); 309 if (error) { 310 VFS_UNLOCK_GIANT(vfslocked); 311 return (error); 312 } 313 #ifdef MAC 314 error = mac_mount_check_stat(td->td_ucred, mp); 315 if (error) 316 goto out; 317 #endif 318 /* 319 * Set these in case the underlying filesystem fails to do so. 320 */ 321 sp = &mp->mnt_stat; 322 sp->f_version = STATFS_VERSION; 323 sp->f_namemax = NAME_MAX; 324 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 325 error = VFS_STATFS(mp, sp); 326 if (error) 327 goto out; 328 if (priv_check(td, PRIV_VFS_GENERATION)) { 329 bcopy(sp, &sb, sizeof(sb)); 330 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 331 prison_enforce_statfs(td->td_ucred, mp, &sb); 332 sp = &sb; 333 } 334 *buf = *sp; 335 out: 336 vfs_unbusy(mp); 337 VFS_UNLOCK_GIANT(vfslocked); 338 return (error); 339 } 340 341 /* 342 * Get filesystem statistics. 343 */ 344 #ifndef _SYS_SYSPROTO_H_ 345 struct fstatfs_args { 346 int fd; 347 struct statfs *buf; 348 }; 349 #endif 350 int 351 sys_fstatfs(td, uap) 352 struct thread *td; 353 register struct fstatfs_args /* { 354 int fd; 355 struct statfs *buf; 356 } */ *uap; 357 { 358 struct statfs sf; 359 int error; 360 361 error = kern_fstatfs(td, uap->fd, &sf); 362 if (error == 0) 363 error = copyout(&sf, uap->buf, sizeof(sf)); 364 return (error); 365 } 366 367 int 368 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 369 { 370 struct file *fp; 371 struct mount *mp; 372 struct statfs *sp, sb; 373 int vfslocked; 374 struct vnode *vp; 375 int error; 376 377 AUDIT_ARG_FD(fd); 378 error = getvnode(td->td_proc->p_fd, fd, CAP_FSTATFS, &fp); 379 if (error) 380 return (error); 381 vp = fp->f_vnode; 382 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 383 vn_lock(vp, LK_SHARED | LK_RETRY); 384 #ifdef AUDIT 385 AUDIT_ARG_VNODE1(vp); 386 #endif 387 mp = vp->v_mount; 388 if (mp) 389 vfs_ref(mp); 390 VOP_UNLOCK(vp, 0); 391 fdrop(fp, td); 392 if (mp == NULL) { 393 error = EBADF; 394 goto out; 395 } 396 error = vfs_busy(mp, 0); 397 vfs_rel(mp); 398 if (error) { 399 VFS_UNLOCK_GIANT(vfslocked); 400 return (error); 401 } 402 #ifdef MAC 403 error = mac_mount_check_stat(td->td_ucred, mp); 404 if (error) 405 goto out; 406 #endif 407 /* 408 * Set these in case the underlying filesystem fails to do so. 409 */ 410 sp = &mp->mnt_stat; 411 sp->f_version = STATFS_VERSION; 412 sp->f_namemax = NAME_MAX; 413 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 414 error = VFS_STATFS(mp, sp); 415 if (error) 416 goto out; 417 if (priv_check(td, PRIV_VFS_GENERATION)) { 418 bcopy(sp, &sb, sizeof(sb)); 419 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 420 prison_enforce_statfs(td->td_ucred, mp, &sb); 421 sp = &sb; 422 } 423 *buf = *sp; 424 out: 425 if (mp) 426 vfs_unbusy(mp); 427 VFS_UNLOCK_GIANT(vfslocked); 428 return (error); 429 } 430 431 /* 432 * Get statistics on all filesystems. 433 */ 434 #ifndef _SYS_SYSPROTO_H_ 435 struct getfsstat_args { 436 struct statfs *buf; 437 long bufsize; 438 int flags; 439 }; 440 #endif 441 int 442 sys_getfsstat(td, uap) 443 struct thread *td; 444 register struct getfsstat_args /* { 445 struct statfs *buf; 446 long bufsize; 447 int flags; 448 } */ *uap; 449 { 450 451 return (kern_getfsstat(td, &uap->buf, uap->bufsize, UIO_USERSPACE, 452 uap->flags)); 453 } 454 455 /* 456 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 457 * The caller is responsible for freeing memory which will be allocated 458 * in '*buf'. 459 */ 460 int 461 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 462 enum uio_seg bufseg, int flags) 463 { 464 struct mount *mp, *nmp; 465 struct statfs *sfsp, *sp, sb; 466 size_t count, maxcount; 467 int vfslocked; 468 int error; 469 470 maxcount = bufsize / sizeof(struct statfs); 471 if (bufsize == 0) 472 sfsp = NULL; 473 else if (bufseg == UIO_USERSPACE) 474 sfsp = *buf; 475 else /* if (bufseg == UIO_SYSSPACE) */ { 476 count = 0; 477 mtx_lock(&mountlist_mtx); 478 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 479 count++; 480 } 481 mtx_unlock(&mountlist_mtx); 482 if (maxcount > count) 483 maxcount = count; 484 sfsp = *buf = malloc(maxcount * sizeof(struct statfs), M_TEMP, 485 M_WAITOK); 486 } 487 count = 0; 488 mtx_lock(&mountlist_mtx); 489 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 490 if (prison_canseemount(td->td_ucred, mp) != 0) { 491 nmp = TAILQ_NEXT(mp, mnt_list); 492 continue; 493 } 494 #ifdef MAC 495 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 496 nmp = TAILQ_NEXT(mp, mnt_list); 497 continue; 498 } 499 #endif 500 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 501 nmp = TAILQ_NEXT(mp, mnt_list); 502 continue; 503 } 504 vfslocked = VFS_LOCK_GIANT(mp); 505 if (sfsp && count < maxcount) { 506 sp = &mp->mnt_stat; 507 /* 508 * Set these in case the underlying filesystem 509 * fails to do so. 510 */ 511 sp->f_version = STATFS_VERSION; 512 sp->f_namemax = NAME_MAX; 513 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 514 /* 515 * If MNT_NOWAIT or MNT_LAZY is specified, do not 516 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY 517 * overrides MNT_WAIT. 518 */ 519 if (((flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || 520 (flags & MNT_WAIT)) && 521 (error = VFS_STATFS(mp, sp))) { 522 VFS_UNLOCK_GIANT(vfslocked); 523 mtx_lock(&mountlist_mtx); 524 nmp = TAILQ_NEXT(mp, mnt_list); 525 vfs_unbusy(mp); 526 continue; 527 } 528 if (priv_check(td, PRIV_VFS_GENERATION)) { 529 bcopy(sp, &sb, sizeof(sb)); 530 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 531 prison_enforce_statfs(td->td_ucred, mp, &sb); 532 sp = &sb; 533 } 534 if (bufseg == UIO_SYSSPACE) 535 bcopy(sp, sfsp, sizeof(*sp)); 536 else /* if (bufseg == UIO_USERSPACE) */ { 537 error = copyout(sp, sfsp, sizeof(*sp)); 538 if (error) { 539 vfs_unbusy(mp); 540 VFS_UNLOCK_GIANT(vfslocked); 541 return (error); 542 } 543 } 544 sfsp++; 545 } 546 VFS_UNLOCK_GIANT(vfslocked); 547 count++; 548 mtx_lock(&mountlist_mtx); 549 nmp = TAILQ_NEXT(mp, mnt_list); 550 vfs_unbusy(mp); 551 } 552 mtx_unlock(&mountlist_mtx); 553 if (sfsp && count > maxcount) 554 td->td_retval[0] = maxcount; 555 else 556 td->td_retval[0] = count; 557 return (0); 558 } 559 560 #ifdef COMPAT_FREEBSD4 561 /* 562 * Get old format filesystem statistics. 563 */ 564 static void cvtstatfs(struct statfs *, struct ostatfs *); 565 566 #ifndef _SYS_SYSPROTO_H_ 567 struct freebsd4_statfs_args { 568 char *path; 569 struct ostatfs *buf; 570 }; 571 #endif 572 int 573 freebsd4_statfs(td, uap) 574 struct thread *td; 575 struct freebsd4_statfs_args /* { 576 char *path; 577 struct ostatfs *buf; 578 } */ *uap; 579 { 580 struct ostatfs osb; 581 struct statfs sf; 582 int error; 583 584 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf); 585 if (error) 586 return (error); 587 cvtstatfs(&sf, &osb); 588 return (copyout(&osb, uap->buf, sizeof(osb))); 589 } 590 591 /* 592 * Get filesystem statistics. 593 */ 594 #ifndef _SYS_SYSPROTO_H_ 595 struct freebsd4_fstatfs_args { 596 int fd; 597 struct ostatfs *buf; 598 }; 599 #endif 600 int 601 freebsd4_fstatfs(td, uap) 602 struct thread *td; 603 struct freebsd4_fstatfs_args /* { 604 int fd; 605 struct ostatfs *buf; 606 } */ *uap; 607 { 608 struct ostatfs osb; 609 struct statfs sf; 610 int error; 611 612 error = kern_fstatfs(td, uap->fd, &sf); 613 if (error) 614 return (error); 615 cvtstatfs(&sf, &osb); 616 return (copyout(&osb, uap->buf, sizeof(osb))); 617 } 618 619 /* 620 * Get statistics on all filesystems. 621 */ 622 #ifndef _SYS_SYSPROTO_H_ 623 struct freebsd4_getfsstat_args { 624 struct ostatfs *buf; 625 long bufsize; 626 int flags; 627 }; 628 #endif 629 int 630 freebsd4_getfsstat(td, uap) 631 struct thread *td; 632 register struct freebsd4_getfsstat_args /* { 633 struct ostatfs *buf; 634 long bufsize; 635 int flags; 636 } */ *uap; 637 { 638 struct statfs *buf, *sp; 639 struct ostatfs osb; 640 size_t count, size; 641 int error; 642 643 count = uap->bufsize / sizeof(struct ostatfs); 644 size = count * sizeof(struct statfs); 645 error = kern_getfsstat(td, &buf, size, UIO_SYSSPACE, uap->flags); 646 if (size > 0) { 647 count = td->td_retval[0]; 648 sp = buf; 649 while (count > 0 && error == 0) { 650 cvtstatfs(sp, &osb); 651 error = copyout(&osb, uap->buf, sizeof(osb)); 652 sp++; 653 uap->buf++; 654 count--; 655 } 656 free(buf, M_TEMP); 657 } 658 return (error); 659 } 660 661 /* 662 * Implement fstatfs() for (NFS) file handles. 663 */ 664 #ifndef _SYS_SYSPROTO_H_ 665 struct freebsd4_fhstatfs_args { 666 struct fhandle *u_fhp; 667 struct ostatfs *buf; 668 }; 669 #endif 670 int 671 freebsd4_fhstatfs(td, uap) 672 struct thread *td; 673 struct freebsd4_fhstatfs_args /* { 674 struct fhandle *u_fhp; 675 struct ostatfs *buf; 676 } */ *uap; 677 { 678 struct ostatfs osb; 679 struct statfs sf; 680 fhandle_t fh; 681 int error; 682 683 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 684 if (error) 685 return (error); 686 error = kern_fhstatfs(td, fh, &sf); 687 if (error) 688 return (error); 689 cvtstatfs(&sf, &osb); 690 return (copyout(&osb, uap->buf, sizeof(osb))); 691 } 692 693 /* 694 * Convert a new format statfs structure to an old format statfs structure. 695 */ 696 static void 697 cvtstatfs(nsp, osp) 698 struct statfs *nsp; 699 struct ostatfs *osp; 700 { 701 702 statfs_scale_blocks(nsp, LONG_MAX); 703 bzero(osp, sizeof(*osp)); 704 osp->f_bsize = nsp->f_bsize; 705 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 706 osp->f_blocks = nsp->f_blocks; 707 osp->f_bfree = nsp->f_bfree; 708 osp->f_bavail = nsp->f_bavail; 709 osp->f_files = MIN(nsp->f_files, LONG_MAX); 710 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 711 osp->f_owner = nsp->f_owner; 712 osp->f_type = nsp->f_type; 713 osp->f_flags = nsp->f_flags; 714 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 715 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 716 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 717 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 718 strlcpy(osp->f_fstypename, nsp->f_fstypename, 719 MIN(MFSNAMELEN, OMFSNAMELEN)); 720 strlcpy(osp->f_mntonname, nsp->f_mntonname, 721 MIN(MNAMELEN, OMNAMELEN)); 722 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 723 MIN(MNAMELEN, OMNAMELEN)); 724 osp->f_fsid = nsp->f_fsid; 725 } 726 #endif /* COMPAT_FREEBSD4 */ 727 728 /* 729 * Change current working directory to a given file descriptor. 730 */ 731 #ifndef _SYS_SYSPROTO_H_ 732 struct fchdir_args { 733 int fd; 734 }; 735 #endif 736 int 737 sys_fchdir(td, uap) 738 struct thread *td; 739 struct fchdir_args /* { 740 int fd; 741 } */ *uap; 742 { 743 register struct filedesc *fdp = td->td_proc->p_fd; 744 struct vnode *vp, *tdp, *vpold; 745 struct mount *mp; 746 struct file *fp; 747 int vfslocked; 748 int error; 749 750 AUDIT_ARG_FD(uap->fd); 751 if ((error = getvnode(fdp, uap->fd, CAP_FCHDIR, &fp)) != 0) 752 return (error); 753 vp = fp->f_vnode; 754 VREF(vp); 755 fdrop(fp, td); 756 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 757 vn_lock(vp, LK_SHARED | LK_RETRY); 758 AUDIT_ARG_VNODE1(vp); 759 error = change_dir(vp, td); 760 while (!error && (mp = vp->v_mountedhere) != NULL) { 761 int tvfslocked; 762 if (vfs_busy(mp, 0)) 763 continue; 764 tvfslocked = VFS_LOCK_GIANT(mp); 765 error = VFS_ROOT(mp, LK_SHARED, &tdp); 766 vfs_unbusy(mp); 767 if (error) { 768 VFS_UNLOCK_GIANT(tvfslocked); 769 break; 770 } 771 vput(vp); 772 VFS_UNLOCK_GIANT(vfslocked); 773 vp = tdp; 774 vfslocked = tvfslocked; 775 } 776 if (error) { 777 vput(vp); 778 VFS_UNLOCK_GIANT(vfslocked); 779 return (error); 780 } 781 VOP_UNLOCK(vp, 0); 782 VFS_UNLOCK_GIANT(vfslocked); 783 FILEDESC_XLOCK(fdp); 784 vpold = fdp->fd_cdir; 785 fdp->fd_cdir = vp; 786 FILEDESC_XUNLOCK(fdp); 787 vfslocked = VFS_LOCK_GIANT(vpold->v_mount); 788 vrele(vpold); 789 VFS_UNLOCK_GIANT(vfslocked); 790 return (0); 791 } 792 793 /* 794 * Change current working directory (``.''). 795 */ 796 #ifndef _SYS_SYSPROTO_H_ 797 struct chdir_args { 798 char *path; 799 }; 800 #endif 801 int 802 sys_chdir(td, uap) 803 struct thread *td; 804 struct chdir_args /* { 805 char *path; 806 } */ *uap; 807 { 808 809 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 810 } 811 812 int 813 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg) 814 { 815 register struct filedesc *fdp = td->td_proc->p_fd; 816 int error; 817 struct nameidata nd; 818 struct vnode *vp; 819 int vfslocked; 820 821 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | 822 MPSAFE, pathseg, path, td); 823 if ((error = namei(&nd)) != 0) 824 return (error); 825 vfslocked = NDHASGIANT(&nd); 826 if ((error = change_dir(nd.ni_vp, td)) != 0) { 827 vput(nd.ni_vp); 828 VFS_UNLOCK_GIANT(vfslocked); 829 NDFREE(&nd, NDF_ONLY_PNBUF); 830 return (error); 831 } 832 VOP_UNLOCK(nd.ni_vp, 0); 833 VFS_UNLOCK_GIANT(vfslocked); 834 NDFREE(&nd, NDF_ONLY_PNBUF); 835 FILEDESC_XLOCK(fdp); 836 vp = fdp->fd_cdir; 837 fdp->fd_cdir = nd.ni_vp; 838 FILEDESC_XUNLOCK(fdp); 839 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 840 vrele(vp); 841 VFS_UNLOCK_GIANT(vfslocked); 842 return (0); 843 } 844 845 /* 846 * Helper function for raised chroot(2) security function: Refuse if 847 * any filedescriptors are open directories. 848 */ 849 static int 850 chroot_refuse_vdir_fds(fdp) 851 struct filedesc *fdp; 852 { 853 struct vnode *vp; 854 struct file *fp; 855 int fd; 856 857 FILEDESC_LOCK_ASSERT(fdp); 858 859 for (fd = 0; fd < fdp->fd_nfiles ; fd++) { 860 fp = fget_locked(fdp, fd); 861 if (fp == NULL) 862 continue; 863 if (fp->f_type == DTYPE_VNODE) { 864 vp = fp->f_vnode; 865 if (vp->v_type == VDIR) 866 return (EPERM); 867 } 868 } 869 return (0); 870 } 871 872 /* 873 * This sysctl determines if we will allow a process to chroot(2) if it 874 * has a directory open: 875 * 0: disallowed for all processes. 876 * 1: allowed for processes that were not already chroot(2)'ed. 877 * 2: allowed for all processes. 878 */ 879 880 static int chroot_allow_open_directories = 1; 881 882 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, 883 &chroot_allow_open_directories, 0, 884 "Allow a process to chroot(2) if it has a directory open"); 885 886 /* 887 * Change notion of root (``/'') directory. 888 */ 889 #ifndef _SYS_SYSPROTO_H_ 890 struct chroot_args { 891 char *path; 892 }; 893 #endif 894 int 895 sys_chroot(td, uap) 896 struct thread *td; 897 struct chroot_args /* { 898 char *path; 899 } */ *uap; 900 { 901 int error; 902 struct nameidata nd; 903 int vfslocked; 904 905 error = priv_check(td, PRIV_VFS_CHROOT); 906 if (error) 907 return (error); 908 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | 909 AUDITVNODE1, UIO_USERSPACE, uap->path, td); 910 error = namei(&nd); 911 if (error) 912 goto error; 913 vfslocked = NDHASGIANT(&nd); 914 if ((error = change_dir(nd.ni_vp, td)) != 0) 915 goto e_vunlock; 916 #ifdef MAC 917 if ((error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp))) 918 goto e_vunlock; 919 #endif 920 VOP_UNLOCK(nd.ni_vp, 0); 921 error = change_root(nd.ni_vp, td); 922 vrele(nd.ni_vp); 923 VFS_UNLOCK_GIANT(vfslocked); 924 NDFREE(&nd, NDF_ONLY_PNBUF); 925 return (error); 926 e_vunlock: 927 vput(nd.ni_vp); 928 VFS_UNLOCK_GIANT(vfslocked); 929 error: 930 NDFREE(&nd, NDF_ONLY_PNBUF); 931 return (error); 932 } 933 934 /* 935 * Common routine for chroot and chdir. Callers must provide a locked vnode 936 * instance. 937 */ 938 int 939 change_dir(vp, td) 940 struct vnode *vp; 941 struct thread *td; 942 { 943 int error; 944 945 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 946 if (vp->v_type != VDIR) 947 return (ENOTDIR); 948 #ifdef MAC 949 error = mac_vnode_check_chdir(td->td_ucred, vp); 950 if (error) 951 return (error); 952 #endif 953 error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td); 954 return (error); 955 } 956 957 /* 958 * Common routine for kern_chroot() and jail_attach(). The caller is 959 * responsible for invoking priv_check() and mac_vnode_check_chroot() to 960 * authorize this operation. 961 */ 962 int 963 change_root(vp, td) 964 struct vnode *vp; 965 struct thread *td; 966 { 967 struct filedesc *fdp; 968 struct vnode *oldvp; 969 int vfslocked; 970 int error; 971 972 VFS_ASSERT_GIANT(vp->v_mount); 973 fdp = td->td_proc->p_fd; 974 FILEDESC_XLOCK(fdp); 975 if (chroot_allow_open_directories == 0 || 976 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { 977 error = chroot_refuse_vdir_fds(fdp); 978 if (error) { 979 FILEDESC_XUNLOCK(fdp); 980 return (error); 981 } 982 } 983 oldvp = fdp->fd_rdir; 984 fdp->fd_rdir = vp; 985 VREF(fdp->fd_rdir); 986 if (!fdp->fd_jdir) { 987 fdp->fd_jdir = vp; 988 VREF(fdp->fd_jdir); 989 } 990 FILEDESC_XUNLOCK(fdp); 991 vfslocked = VFS_LOCK_GIANT(oldvp->v_mount); 992 vrele(oldvp); 993 VFS_UNLOCK_GIANT(vfslocked); 994 return (0); 995 } 996 997 static __inline cap_rights_t 998 flags_to_rights(int flags) 999 { 1000 cap_rights_t rights = 0; 1001 1002 switch ((flags & O_ACCMODE)) { 1003 case O_RDONLY: 1004 rights |= CAP_READ; 1005 break; 1006 1007 case O_RDWR: 1008 rights |= CAP_READ; 1009 /* fall through */ 1010 1011 case O_WRONLY: 1012 rights |= CAP_WRITE; 1013 break; 1014 1015 case O_EXEC: 1016 rights |= CAP_FEXECVE; 1017 break; 1018 } 1019 1020 if (flags & O_CREAT) 1021 rights |= CAP_CREATE; 1022 1023 if (flags & O_TRUNC) 1024 rights |= CAP_FTRUNCATE; 1025 1026 if ((flags & O_EXLOCK) || (flags & O_SHLOCK)) 1027 rights |= CAP_FLOCK; 1028 1029 return (rights); 1030 } 1031 1032 /* 1033 * Check permissions, allocate an open file structure, and call the device 1034 * open routine if any. 1035 */ 1036 #ifndef _SYS_SYSPROTO_H_ 1037 struct open_args { 1038 char *path; 1039 int flags; 1040 int mode; 1041 }; 1042 #endif 1043 int 1044 sys_open(td, uap) 1045 struct thread *td; 1046 register struct open_args /* { 1047 char *path; 1048 int flags; 1049 int mode; 1050 } */ *uap; 1051 { 1052 1053 return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode)); 1054 } 1055 1056 #ifndef _SYS_SYSPROTO_H_ 1057 struct openat_args { 1058 int fd; 1059 char *path; 1060 int flag; 1061 int mode; 1062 }; 1063 #endif 1064 int 1065 sys_openat(struct thread *td, struct openat_args *uap) 1066 { 1067 1068 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1069 uap->mode)); 1070 } 1071 1072 int 1073 kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags, 1074 int mode) 1075 { 1076 1077 return (kern_openat(td, AT_FDCWD, path, pathseg, flags, mode)); 1078 } 1079 1080 int 1081 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1082 int flags, int mode) 1083 { 1084 struct proc *p = td->td_proc; 1085 struct filedesc *fdp = p->p_fd; 1086 struct file *fp; 1087 struct vnode *vp; 1088 int cmode; 1089 struct file *nfp; 1090 int type, indx = -1, error, error_open; 1091 struct flock lf; 1092 struct nameidata nd; 1093 int vfslocked; 1094 cap_rights_t rights_needed = CAP_LOOKUP; 1095 1096 AUDIT_ARG_FFLAGS(flags); 1097 AUDIT_ARG_MODE(mode); 1098 /* XXX: audit dirfd */ 1099 rights_needed |= flags_to_rights(flags); 1100 /* 1101 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1102 * may be specified. 1103 */ 1104 if (flags & O_EXEC) { 1105 if (flags & O_ACCMODE) 1106 return (EINVAL); 1107 } else if ((flags & O_ACCMODE) == O_ACCMODE) 1108 return (EINVAL); 1109 else 1110 flags = FFLAGS(flags); 1111 1112 /* 1113 * allocate the file descriptor, but don't install a descriptor yet 1114 */ 1115 error = falloc_noinstall(td, &nfp); 1116 if (error) 1117 return (error); 1118 /* An extra reference on `nfp' has been held for us by falloc_noinstall(). */ 1119 fp = nfp; 1120 /* Set the flags early so the finit in devfs can pick them up. */ 1121 fp->f_flag = flags & FMASK; 1122 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 1123 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | MPSAFE, pathseg, 1124 path, fd, rights_needed, td); 1125 td->td_dupfd = -1; /* XXX check for fdopen */ 1126 error = vn_open(&nd, &flags, cmode, fp); 1127 if (error) { 1128 /* 1129 * If the vn_open replaced the method vector, something 1130 * wonderous happened deep below and we just pass it up 1131 * pretending we know what we do. 1132 */ 1133 if (error == ENXIO && fp->f_ops != &badfileops) 1134 goto success; 1135 1136 /* 1137 * handle special fdopen() case. bleh. dupfdopen() is 1138 * responsible for dropping the old contents of ofiles[indx] 1139 * if it succeeds. 1140 * 1141 * Don't do this for relative (capability) lookups; we don't 1142 * understand exactly what would happen, and we don't think 1143 * that it ever should. 1144 */ 1145 if ((nd.ni_strictrelative == 0) && 1146 (error == ENODEV || error == ENXIO) && 1147 (td->td_dupfd >= 0)) { 1148 /* XXX from fdopen */ 1149 error_open = error; 1150 if ((error = finstall(td, fp, &indx, flags)) != 0) 1151 goto bad_unlocked; 1152 if ((error = dupfdopen(td, fdp, indx, td->td_dupfd, 1153 flags, error_open)) == 0) 1154 goto success; 1155 } 1156 /* 1157 * Clean up the descriptor, but only if another thread hadn't 1158 * replaced or closed it. 1159 */ 1160 if (indx != -1) 1161 fdclose(fdp, fp, indx, td); 1162 fdrop(fp, td); 1163 1164 if (error == ERESTART) 1165 error = EINTR; 1166 return (error); 1167 } 1168 td->td_dupfd = 0; 1169 vfslocked = NDHASGIANT(&nd); 1170 NDFREE(&nd, NDF_ONLY_PNBUF); 1171 vp = nd.ni_vp; 1172 1173 /* 1174 * Store the vnode, for any f_type. Typically, the vnode use 1175 * count is decremented by direct call to vn_closefile() for 1176 * files that switched type in the cdevsw fdopen() method. 1177 */ 1178 fp->f_vnode = vp; 1179 /* 1180 * If the file wasn't claimed by devfs bind it to the normal 1181 * vnode operations here. 1182 */ 1183 if (fp->f_ops == &badfileops) { 1184 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); 1185 fp->f_seqcount = 1; 1186 finit(fp, flags & FMASK, DTYPE_VNODE, vp, &vnops); 1187 } 1188 1189 VOP_UNLOCK(vp, 0); 1190 if (fp->f_type == DTYPE_VNODE && (flags & (O_EXLOCK | O_SHLOCK)) != 0) { 1191 lf.l_whence = SEEK_SET; 1192 lf.l_start = 0; 1193 lf.l_len = 0; 1194 if (flags & O_EXLOCK) 1195 lf.l_type = F_WRLCK; 1196 else 1197 lf.l_type = F_RDLCK; 1198 type = F_FLOCK; 1199 if ((flags & FNONBLOCK) == 0) 1200 type |= F_WAIT; 1201 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, 1202 type)) != 0) 1203 goto bad; 1204 atomic_set_int(&fp->f_flag, FHASLOCK); 1205 } 1206 if (flags & O_TRUNC) { 1207 error = fo_truncate(fp, 0, td->td_ucred, td); 1208 if (error) 1209 goto bad; 1210 } 1211 VFS_UNLOCK_GIANT(vfslocked); 1212 success: 1213 /* 1214 * If we haven't already installed the FD (for dupfdopen), do so now. 1215 */ 1216 if (indx == -1) { 1217 #ifdef CAPABILITIES 1218 if (nd.ni_strictrelative == 1) { 1219 /* 1220 * We are doing a strict relative lookup; wrap the 1221 * result in a capability. 1222 */ 1223 if ((error = kern_capwrap(td, fp, nd.ni_baserights, 1224 &indx)) != 0) 1225 goto bad_unlocked; 1226 } else 1227 #endif 1228 if ((error = finstall(td, fp, &indx, flags)) != 0) 1229 goto bad_unlocked; 1230 1231 } 1232 1233 /* 1234 * Release our private reference, leaving the one associated with 1235 * the descriptor table intact. 1236 */ 1237 fdrop(fp, td); 1238 td->td_retval[0] = indx; 1239 return (0); 1240 bad: 1241 VFS_UNLOCK_GIANT(vfslocked); 1242 bad_unlocked: 1243 if (indx != -1) 1244 fdclose(fdp, fp, indx, td); 1245 fdrop(fp, td); 1246 td->td_retval[0] = -1; 1247 return (error); 1248 } 1249 1250 #ifdef COMPAT_43 1251 /* 1252 * Create a file. 1253 */ 1254 #ifndef _SYS_SYSPROTO_H_ 1255 struct ocreat_args { 1256 char *path; 1257 int mode; 1258 }; 1259 #endif 1260 int 1261 ocreat(td, uap) 1262 struct thread *td; 1263 register struct ocreat_args /* { 1264 char *path; 1265 int mode; 1266 } */ *uap; 1267 { 1268 1269 return (kern_open(td, uap->path, UIO_USERSPACE, 1270 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1271 } 1272 #endif /* COMPAT_43 */ 1273 1274 /* 1275 * Create a special file. 1276 */ 1277 #ifndef _SYS_SYSPROTO_H_ 1278 struct mknod_args { 1279 char *path; 1280 int mode; 1281 int dev; 1282 }; 1283 #endif 1284 int 1285 sys_mknod(td, uap) 1286 struct thread *td; 1287 register struct mknod_args /* { 1288 char *path; 1289 int mode; 1290 int dev; 1291 } */ *uap; 1292 { 1293 1294 return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev)); 1295 } 1296 1297 #ifndef _SYS_SYSPROTO_H_ 1298 struct mknodat_args { 1299 int fd; 1300 char *path; 1301 mode_t mode; 1302 dev_t dev; 1303 }; 1304 #endif 1305 int 1306 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1307 { 1308 1309 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1310 uap->dev)); 1311 } 1312 1313 int 1314 kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode, 1315 int dev) 1316 { 1317 1318 return (kern_mknodat(td, AT_FDCWD, path, pathseg, mode, dev)); 1319 } 1320 1321 int 1322 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1323 int mode, int dev) 1324 { 1325 struct vnode *vp; 1326 struct mount *mp; 1327 struct vattr vattr; 1328 int error; 1329 int whiteout = 0; 1330 struct nameidata nd; 1331 int vfslocked; 1332 1333 AUDIT_ARG_MODE(mode); 1334 AUDIT_ARG_DEV(dev); 1335 switch (mode & S_IFMT) { 1336 case S_IFCHR: 1337 case S_IFBLK: 1338 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1339 break; 1340 case S_IFMT: 1341 error = priv_check(td, PRIV_VFS_MKNOD_BAD); 1342 break; 1343 case S_IFWHT: 1344 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1345 break; 1346 case S_IFIFO: 1347 if (dev == 0) 1348 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1349 /* FALLTHROUGH */ 1350 default: 1351 error = EINVAL; 1352 break; 1353 } 1354 if (error) 1355 return (error); 1356 restart: 1357 bwillwrite(); 1358 NDINIT_ATRIGHTS(&nd, CREATE, 1359 LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, pathseg, path, fd, 1360 CAP_MKFIFO, td); 1361 if ((error = namei(&nd)) != 0) 1362 return (error); 1363 vfslocked = NDHASGIANT(&nd); 1364 vp = nd.ni_vp; 1365 if (vp != NULL) { 1366 NDFREE(&nd, NDF_ONLY_PNBUF); 1367 if (vp == nd.ni_dvp) 1368 vrele(nd.ni_dvp); 1369 else 1370 vput(nd.ni_dvp); 1371 vrele(vp); 1372 VFS_UNLOCK_GIANT(vfslocked); 1373 return (EEXIST); 1374 } else { 1375 VATTR_NULL(&vattr); 1376 vattr.va_mode = (mode & ALLPERMS) & 1377 ~td->td_proc->p_fd->fd_cmask; 1378 vattr.va_rdev = dev; 1379 whiteout = 0; 1380 1381 switch (mode & S_IFMT) { 1382 case S_IFMT: /* used by badsect to flag bad sectors */ 1383 vattr.va_type = VBAD; 1384 break; 1385 case S_IFCHR: 1386 vattr.va_type = VCHR; 1387 break; 1388 case S_IFBLK: 1389 vattr.va_type = VBLK; 1390 break; 1391 case S_IFWHT: 1392 whiteout = 1; 1393 break; 1394 default: 1395 panic("kern_mknod: invalid mode"); 1396 } 1397 } 1398 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1399 NDFREE(&nd, NDF_ONLY_PNBUF); 1400 vput(nd.ni_dvp); 1401 VFS_UNLOCK_GIANT(vfslocked); 1402 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1403 return (error); 1404 goto restart; 1405 } 1406 #ifdef MAC 1407 if (error == 0 && !whiteout) 1408 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1409 &nd.ni_cnd, &vattr); 1410 #endif 1411 if (!error) { 1412 if (whiteout) 1413 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1414 else { 1415 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1416 &nd.ni_cnd, &vattr); 1417 if (error == 0) 1418 vput(nd.ni_vp); 1419 } 1420 } 1421 NDFREE(&nd, NDF_ONLY_PNBUF); 1422 vput(nd.ni_dvp); 1423 vn_finished_write(mp); 1424 VFS_UNLOCK_GIANT(vfslocked); 1425 return (error); 1426 } 1427 1428 /* 1429 * Create a named pipe. 1430 */ 1431 #ifndef _SYS_SYSPROTO_H_ 1432 struct mkfifo_args { 1433 char *path; 1434 int mode; 1435 }; 1436 #endif 1437 int 1438 sys_mkfifo(td, uap) 1439 struct thread *td; 1440 register struct mkfifo_args /* { 1441 char *path; 1442 int mode; 1443 } */ *uap; 1444 { 1445 1446 return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode)); 1447 } 1448 1449 #ifndef _SYS_SYSPROTO_H_ 1450 struct mkfifoat_args { 1451 int fd; 1452 char *path; 1453 mode_t mode; 1454 }; 1455 #endif 1456 int 1457 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1458 { 1459 1460 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1461 uap->mode)); 1462 } 1463 1464 int 1465 kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode) 1466 { 1467 1468 return (kern_mkfifoat(td, AT_FDCWD, path, pathseg, mode)); 1469 } 1470 1471 int 1472 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1473 int mode) 1474 { 1475 struct mount *mp; 1476 struct vattr vattr; 1477 int error; 1478 struct nameidata nd; 1479 int vfslocked; 1480 1481 AUDIT_ARG_MODE(mode); 1482 restart: 1483 bwillwrite(); 1484 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, 1485 pathseg, path, fd, td); 1486 if ((error = namei(&nd)) != 0) 1487 return (error); 1488 vfslocked = NDHASGIANT(&nd); 1489 if (nd.ni_vp != NULL) { 1490 NDFREE(&nd, NDF_ONLY_PNBUF); 1491 if (nd.ni_vp == nd.ni_dvp) 1492 vrele(nd.ni_dvp); 1493 else 1494 vput(nd.ni_dvp); 1495 vrele(nd.ni_vp); 1496 VFS_UNLOCK_GIANT(vfslocked); 1497 return (EEXIST); 1498 } 1499 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1500 NDFREE(&nd, NDF_ONLY_PNBUF); 1501 vput(nd.ni_dvp); 1502 VFS_UNLOCK_GIANT(vfslocked); 1503 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1504 return (error); 1505 goto restart; 1506 } 1507 VATTR_NULL(&vattr); 1508 vattr.va_type = VFIFO; 1509 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1510 #ifdef MAC 1511 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1512 &vattr); 1513 if (error) 1514 goto out; 1515 #endif 1516 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1517 if (error == 0) 1518 vput(nd.ni_vp); 1519 #ifdef MAC 1520 out: 1521 #endif 1522 vput(nd.ni_dvp); 1523 vn_finished_write(mp); 1524 VFS_UNLOCK_GIANT(vfslocked); 1525 NDFREE(&nd, NDF_ONLY_PNBUF); 1526 return (error); 1527 } 1528 1529 /* 1530 * Make a hard file link. 1531 */ 1532 #ifndef _SYS_SYSPROTO_H_ 1533 struct link_args { 1534 char *path; 1535 char *link; 1536 }; 1537 #endif 1538 int 1539 sys_link(td, uap) 1540 struct thread *td; 1541 register struct link_args /* { 1542 char *path; 1543 char *link; 1544 } */ *uap; 1545 { 1546 1547 return (kern_link(td, uap->path, uap->link, UIO_USERSPACE)); 1548 } 1549 1550 #ifndef _SYS_SYSPROTO_H_ 1551 struct linkat_args { 1552 int fd1; 1553 char *path1; 1554 int fd2; 1555 char *path2; 1556 int flag; 1557 }; 1558 #endif 1559 int 1560 sys_linkat(struct thread *td, struct linkat_args *uap) 1561 { 1562 int flag; 1563 1564 flag = uap->flag; 1565 if (flag & ~AT_SYMLINK_FOLLOW) 1566 return (EINVAL); 1567 1568 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1569 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW)); 1570 } 1571 1572 int hardlink_check_uid = 0; 1573 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1574 &hardlink_check_uid, 0, 1575 "Unprivileged processes cannot create hard links to files owned by other " 1576 "users"); 1577 static int hardlink_check_gid = 0; 1578 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1579 &hardlink_check_gid, 0, 1580 "Unprivileged processes cannot create hard links to files owned by other " 1581 "groups"); 1582 1583 static int 1584 can_hardlink(struct vnode *vp, struct ucred *cred) 1585 { 1586 struct vattr va; 1587 int error; 1588 1589 if (!hardlink_check_uid && !hardlink_check_gid) 1590 return (0); 1591 1592 error = VOP_GETATTR(vp, &va, cred); 1593 if (error != 0) 1594 return (error); 1595 1596 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1597 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1598 if (error) 1599 return (error); 1600 } 1601 1602 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1603 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1604 if (error) 1605 return (error); 1606 } 1607 1608 return (0); 1609 } 1610 1611 int 1612 kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg) 1613 { 1614 1615 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, path,link, segflg, FOLLOW)); 1616 } 1617 1618 int 1619 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2, 1620 enum uio_seg segflg, int follow) 1621 { 1622 struct vnode *vp; 1623 struct mount *mp; 1624 struct nameidata nd; 1625 int vfslocked; 1626 int lvfslocked; 1627 int error; 1628 1629 bwillwrite(); 1630 NDINIT_AT(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, segflg, path1, 1631 fd1, td); 1632 1633 if ((error = namei(&nd)) != 0) 1634 return (error); 1635 vfslocked = NDHASGIANT(&nd); 1636 NDFREE(&nd, NDF_ONLY_PNBUF); 1637 vp = nd.ni_vp; 1638 if (vp->v_type == VDIR) { 1639 vrele(vp); 1640 VFS_UNLOCK_GIANT(vfslocked); 1641 return (EPERM); /* POSIX */ 1642 } 1643 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 1644 vrele(vp); 1645 VFS_UNLOCK_GIANT(vfslocked); 1646 return (error); 1647 } 1648 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE2, 1649 segflg, path2, fd2, td); 1650 if ((error = namei(&nd)) == 0) { 1651 lvfslocked = NDHASGIANT(&nd); 1652 if (nd.ni_vp != NULL) { 1653 if (nd.ni_dvp == nd.ni_vp) 1654 vrele(nd.ni_dvp); 1655 else 1656 vput(nd.ni_dvp); 1657 vrele(nd.ni_vp); 1658 error = EEXIST; 1659 } else if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) 1660 == 0) { 1661 error = can_hardlink(vp, td->td_ucred); 1662 if (error == 0) 1663 #ifdef MAC 1664 error = mac_vnode_check_link(td->td_ucred, 1665 nd.ni_dvp, vp, &nd.ni_cnd); 1666 if (error == 0) 1667 #endif 1668 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1669 VOP_UNLOCK(vp, 0); 1670 vput(nd.ni_dvp); 1671 } 1672 NDFREE(&nd, NDF_ONLY_PNBUF); 1673 VFS_UNLOCK_GIANT(lvfslocked); 1674 } 1675 vrele(vp); 1676 vn_finished_write(mp); 1677 VFS_UNLOCK_GIANT(vfslocked); 1678 return (error); 1679 } 1680 1681 /* 1682 * Make a symbolic link. 1683 */ 1684 #ifndef _SYS_SYSPROTO_H_ 1685 struct symlink_args { 1686 char *path; 1687 char *link; 1688 }; 1689 #endif 1690 int 1691 sys_symlink(td, uap) 1692 struct thread *td; 1693 register struct symlink_args /* { 1694 char *path; 1695 char *link; 1696 } */ *uap; 1697 { 1698 1699 return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE)); 1700 } 1701 1702 #ifndef _SYS_SYSPROTO_H_ 1703 struct symlinkat_args { 1704 char *path; 1705 int fd; 1706 char *path2; 1707 }; 1708 #endif 1709 int 1710 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1711 { 1712 1713 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1714 UIO_USERSPACE)); 1715 } 1716 1717 int 1718 kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg) 1719 { 1720 1721 return (kern_symlinkat(td, path, AT_FDCWD, link, segflg)); 1722 } 1723 1724 int 1725 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2, 1726 enum uio_seg segflg) 1727 { 1728 struct mount *mp; 1729 struct vattr vattr; 1730 char *syspath; 1731 int error; 1732 struct nameidata nd; 1733 int vfslocked; 1734 1735 if (segflg == UIO_SYSSPACE) { 1736 syspath = path1; 1737 } else { 1738 syspath = uma_zalloc(namei_zone, M_WAITOK); 1739 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0) 1740 goto out; 1741 } 1742 AUDIT_ARG_TEXT(syspath); 1743 restart: 1744 bwillwrite(); 1745 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, 1746 segflg, path2, fd, td); 1747 if ((error = namei(&nd)) != 0) 1748 goto out; 1749 vfslocked = NDHASGIANT(&nd); 1750 if (nd.ni_vp) { 1751 NDFREE(&nd, NDF_ONLY_PNBUF); 1752 if (nd.ni_vp == nd.ni_dvp) 1753 vrele(nd.ni_dvp); 1754 else 1755 vput(nd.ni_dvp); 1756 vrele(nd.ni_vp); 1757 VFS_UNLOCK_GIANT(vfslocked); 1758 error = EEXIST; 1759 goto out; 1760 } 1761 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1762 NDFREE(&nd, NDF_ONLY_PNBUF); 1763 vput(nd.ni_dvp); 1764 VFS_UNLOCK_GIANT(vfslocked); 1765 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1766 goto out; 1767 goto restart; 1768 } 1769 VATTR_NULL(&vattr); 1770 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1771 #ifdef MAC 1772 vattr.va_type = VLNK; 1773 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1774 &vattr); 1775 if (error) 1776 goto out2; 1777 #endif 1778 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1779 if (error == 0) 1780 vput(nd.ni_vp); 1781 #ifdef MAC 1782 out2: 1783 #endif 1784 NDFREE(&nd, NDF_ONLY_PNBUF); 1785 vput(nd.ni_dvp); 1786 vn_finished_write(mp); 1787 VFS_UNLOCK_GIANT(vfslocked); 1788 out: 1789 if (segflg != UIO_SYSSPACE) 1790 uma_zfree(namei_zone, syspath); 1791 return (error); 1792 } 1793 1794 /* 1795 * Delete a whiteout from the filesystem. 1796 */ 1797 int 1798 sys_undelete(td, uap) 1799 struct thread *td; 1800 register struct undelete_args /* { 1801 char *path; 1802 } */ *uap; 1803 { 1804 int error; 1805 struct mount *mp; 1806 struct nameidata nd; 1807 int vfslocked; 1808 1809 restart: 1810 bwillwrite(); 1811 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | MPSAFE | AUDITVNODE1, 1812 UIO_USERSPACE, uap->path, td); 1813 error = namei(&nd); 1814 if (error) 1815 return (error); 1816 vfslocked = NDHASGIANT(&nd); 1817 1818 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1819 NDFREE(&nd, NDF_ONLY_PNBUF); 1820 if (nd.ni_vp == nd.ni_dvp) 1821 vrele(nd.ni_dvp); 1822 else 1823 vput(nd.ni_dvp); 1824 if (nd.ni_vp) 1825 vrele(nd.ni_vp); 1826 VFS_UNLOCK_GIANT(vfslocked); 1827 return (EEXIST); 1828 } 1829 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1830 NDFREE(&nd, NDF_ONLY_PNBUF); 1831 vput(nd.ni_dvp); 1832 VFS_UNLOCK_GIANT(vfslocked); 1833 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1834 return (error); 1835 goto restart; 1836 } 1837 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1838 NDFREE(&nd, NDF_ONLY_PNBUF); 1839 vput(nd.ni_dvp); 1840 vn_finished_write(mp); 1841 VFS_UNLOCK_GIANT(vfslocked); 1842 return (error); 1843 } 1844 1845 /* 1846 * Delete a name from the filesystem. 1847 */ 1848 #ifndef _SYS_SYSPROTO_H_ 1849 struct unlink_args { 1850 char *path; 1851 }; 1852 #endif 1853 int 1854 sys_unlink(td, uap) 1855 struct thread *td; 1856 struct unlink_args /* { 1857 char *path; 1858 } */ *uap; 1859 { 1860 1861 return (kern_unlink(td, uap->path, UIO_USERSPACE)); 1862 } 1863 1864 #ifndef _SYS_SYSPROTO_H_ 1865 struct unlinkat_args { 1866 int fd; 1867 char *path; 1868 int flag; 1869 }; 1870 #endif 1871 int 1872 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1873 { 1874 int flag = uap->flag; 1875 int fd = uap->fd; 1876 char *path = uap->path; 1877 1878 if (flag & ~AT_REMOVEDIR) 1879 return (EINVAL); 1880 1881 if (flag & AT_REMOVEDIR) 1882 return (kern_rmdirat(td, fd, path, UIO_USERSPACE)); 1883 else 1884 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0)); 1885 } 1886 1887 int 1888 kern_unlink(struct thread *td, char *path, enum uio_seg pathseg) 1889 { 1890 1891 return (kern_unlinkat(td, AT_FDCWD, path, pathseg, 0)); 1892 } 1893 1894 int 1895 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1896 ino_t oldinum) 1897 { 1898 struct mount *mp; 1899 struct vnode *vp; 1900 int error; 1901 struct nameidata nd; 1902 struct stat sb; 1903 int vfslocked; 1904 1905 restart: 1906 bwillwrite(); 1907 NDINIT_AT(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | AUDITVNODE1, 1908 pathseg, path, fd, td); 1909 if ((error = namei(&nd)) != 0) 1910 return (error == EINVAL ? EPERM : error); 1911 vfslocked = NDHASGIANT(&nd); 1912 vp = nd.ni_vp; 1913 if (vp->v_type == VDIR && oldinum == 0) { 1914 error = EPERM; /* POSIX */ 1915 } else if (oldinum != 0 && 1916 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1917 sb.st_ino != oldinum) { 1918 error = EIDRM; /* Identifier removed */ 1919 } else { 1920 /* 1921 * The root of a mounted filesystem cannot be deleted. 1922 * 1923 * XXX: can this only be a VDIR case? 1924 */ 1925 if (vp->v_vflag & VV_ROOT) 1926 error = EBUSY; 1927 } 1928 if (error == 0) { 1929 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1930 NDFREE(&nd, NDF_ONLY_PNBUF); 1931 vput(nd.ni_dvp); 1932 if (vp == nd.ni_dvp) 1933 vrele(vp); 1934 else 1935 vput(vp); 1936 VFS_UNLOCK_GIANT(vfslocked); 1937 if ((error = vn_start_write(NULL, &mp, 1938 V_XSLEEP | PCATCH)) != 0) 1939 return (error); 1940 goto restart; 1941 } 1942 #ifdef MAC 1943 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1944 &nd.ni_cnd); 1945 if (error) 1946 goto out; 1947 #endif 1948 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1949 #ifdef MAC 1950 out: 1951 #endif 1952 vn_finished_write(mp); 1953 } 1954 NDFREE(&nd, NDF_ONLY_PNBUF); 1955 vput(nd.ni_dvp); 1956 if (vp == nd.ni_dvp) 1957 vrele(vp); 1958 else 1959 vput(vp); 1960 VFS_UNLOCK_GIANT(vfslocked); 1961 return (error); 1962 } 1963 1964 /* 1965 * Reposition read/write file offset. 1966 */ 1967 #ifndef _SYS_SYSPROTO_H_ 1968 struct lseek_args { 1969 int fd; 1970 int pad; 1971 off_t offset; 1972 int whence; 1973 }; 1974 #endif 1975 int 1976 sys_lseek(td, uap) 1977 struct thread *td; 1978 register struct lseek_args /* { 1979 int fd; 1980 int pad; 1981 off_t offset; 1982 int whence; 1983 } */ *uap; 1984 { 1985 struct ucred *cred = td->td_ucred; 1986 struct file *fp; 1987 struct vnode *vp; 1988 struct vattr vattr; 1989 off_t offset, size; 1990 int error, noneg; 1991 int vfslocked; 1992 1993 AUDIT_ARG_FD(uap->fd); 1994 if ((error = fget(td, uap->fd, CAP_SEEK, &fp)) != 0) 1995 return (error); 1996 if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) { 1997 fdrop(fp, td); 1998 return (ESPIPE); 1999 } 2000 vp = fp->f_vnode; 2001 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 2002 noneg = (vp->v_type != VCHR); 2003 offset = uap->offset; 2004 switch (uap->whence) { 2005 case L_INCR: 2006 if (noneg && 2007 (fp->f_offset < 0 || 2008 (offset > 0 && fp->f_offset > OFF_MAX - offset))) { 2009 error = EOVERFLOW; 2010 break; 2011 } 2012 offset += fp->f_offset; 2013 break; 2014 case L_XTND: 2015 vn_lock(vp, LK_SHARED | LK_RETRY); 2016 error = VOP_GETATTR(vp, &vattr, cred); 2017 VOP_UNLOCK(vp, 0); 2018 if (error) 2019 break; 2020 2021 /* 2022 * If the file references a disk device, then fetch 2023 * the media size and use that to determine the ending 2024 * offset. 2025 */ 2026 if (vattr.va_size == 0 && vp->v_type == VCHR && 2027 fo_ioctl(fp, DIOCGMEDIASIZE, &size, cred, td) == 0) 2028 vattr.va_size = size; 2029 if (noneg && 2030 (vattr.va_size > OFF_MAX || 2031 (offset > 0 && vattr.va_size > OFF_MAX - offset))) { 2032 error = EOVERFLOW; 2033 break; 2034 } 2035 offset += vattr.va_size; 2036 break; 2037 case L_SET: 2038 break; 2039 case SEEK_DATA: 2040 error = fo_ioctl(fp, FIOSEEKDATA, &offset, cred, td); 2041 break; 2042 case SEEK_HOLE: 2043 error = fo_ioctl(fp, FIOSEEKHOLE, &offset, cred, td); 2044 break; 2045 default: 2046 error = EINVAL; 2047 } 2048 if (error == 0 && noneg && offset < 0) 2049 error = EINVAL; 2050 if (error != 0) 2051 goto drop; 2052 fp->f_offset = offset; 2053 *(off_t *)(td->td_retval) = fp->f_offset; 2054 drop: 2055 fdrop(fp, td); 2056 VFS_UNLOCK_GIANT(vfslocked); 2057 return (error); 2058 } 2059 2060 #if defined(COMPAT_43) 2061 /* 2062 * Reposition read/write file offset. 2063 */ 2064 #ifndef _SYS_SYSPROTO_H_ 2065 struct olseek_args { 2066 int fd; 2067 long offset; 2068 int whence; 2069 }; 2070 #endif 2071 int 2072 olseek(td, uap) 2073 struct thread *td; 2074 register struct olseek_args /* { 2075 int fd; 2076 long offset; 2077 int whence; 2078 } */ *uap; 2079 { 2080 struct lseek_args /* { 2081 int fd; 2082 int pad; 2083 off_t offset; 2084 int whence; 2085 } */ nuap; 2086 2087 nuap.fd = uap->fd; 2088 nuap.offset = uap->offset; 2089 nuap.whence = uap->whence; 2090 return (sys_lseek(td, &nuap)); 2091 } 2092 #endif /* COMPAT_43 */ 2093 2094 /* Version with the 'pad' argument */ 2095 int 2096 freebsd6_lseek(td, uap) 2097 struct thread *td; 2098 register struct freebsd6_lseek_args *uap; 2099 { 2100 struct lseek_args ouap; 2101 2102 ouap.fd = uap->fd; 2103 ouap.offset = uap->offset; 2104 ouap.whence = uap->whence; 2105 return (sys_lseek(td, &ouap)); 2106 } 2107 2108 /* 2109 * Check access permissions using passed credentials. 2110 */ 2111 static int 2112 vn_access(vp, user_flags, cred, td) 2113 struct vnode *vp; 2114 int user_flags; 2115 struct ucred *cred; 2116 struct thread *td; 2117 { 2118 int error; 2119 accmode_t accmode; 2120 2121 /* Flags == 0 means only check for existence. */ 2122 error = 0; 2123 if (user_flags) { 2124 accmode = 0; 2125 if (user_flags & R_OK) 2126 accmode |= VREAD; 2127 if (user_flags & W_OK) 2128 accmode |= VWRITE; 2129 if (user_flags & X_OK) 2130 accmode |= VEXEC; 2131 #ifdef MAC 2132 error = mac_vnode_check_access(cred, vp, accmode); 2133 if (error) 2134 return (error); 2135 #endif 2136 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 2137 error = VOP_ACCESS(vp, accmode, cred, td); 2138 } 2139 return (error); 2140 } 2141 2142 /* 2143 * Check access permissions using "real" credentials. 2144 */ 2145 #ifndef _SYS_SYSPROTO_H_ 2146 struct access_args { 2147 char *path; 2148 int amode; 2149 }; 2150 #endif 2151 int 2152 sys_access(td, uap) 2153 struct thread *td; 2154 register struct access_args /* { 2155 char *path; 2156 int amode; 2157 } */ *uap; 2158 { 2159 2160 return (kern_access(td, uap->path, UIO_USERSPACE, uap->amode)); 2161 } 2162 2163 #ifndef _SYS_SYSPROTO_H_ 2164 struct faccessat_args { 2165 int dirfd; 2166 char *path; 2167 int amode; 2168 int flag; 2169 } 2170 #endif 2171 int 2172 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2173 { 2174 2175 if (uap->flag & ~AT_EACCESS) 2176 return (EINVAL); 2177 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2178 uap->amode)); 2179 } 2180 2181 int 2182 kern_access(struct thread *td, char *path, enum uio_seg pathseg, int amode) 2183 { 2184 2185 return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, amode)); 2186 } 2187 2188 int 2189 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2190 int flag, int amode) 2191 { 2192 struct ucred *cred, *tmpcred; 2193 struct vnode *vp; 2194 struct nameidata nd; 2195 int vfslocked; 2196 int error; 2197 2198 /* 2199 * Create and modify a temporary credential instead of one that 2200 * is potentially shared. 2201 */ 2202 if (!(flag & AT_EACCESS)) { 2203 cred = td->td_ucred; 2204 tmpcred = crdup(cred); 2205 tmpcred->cr_uid = cred->cr_ruid; 2206 tmpcred->cr_groups[0] = cred->cr_rgid; 2207 td->td_ucred = tmpcred; 2208 } else 2209 cred = tmpcred = td->td_ucred; 2210 AUDIT_ARG_VALUE(amode); 2211 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | 2212 AUDITVNODE1, pathseg, path, fd, CAP_FSTAT, td); 2213 if ((error = namei(&nd)) != 0) 2214 goto out1; 2215 vfslocked = NDHASGIANT(&nd); 2216 vp = nd.ni_vp; 2217 2218 error = vn_access(vp, amode, tmpcred, td); 2219 NDFREE(&nd, NDF_ONLY_PNBUF); 2220 vput(vp); 2221 VFS_UNLOCK_GIANT(vfslocked); 2222 out1: 2223 if (!(flag & AT_EACCESS)) { 2224 td->td_ucred = cred; 2225 crfree(tmpcred); 2226 } 2227 return (error); 2228 } 2229 2230 /* 2231 * Check access permissions using "effective" credentials. 2232 */ 2233 #ifndef _SYS_SYSPROTO_H_ 2234 struct eaccess_args { 2235 char *path; 2236 int amode; 2237 }; 2238 #endif 2239 int 2240 sys_eaccess(td, uap) 2241 struct thread *td; 2242 register struct eaccess_args /* { 2243 char *path; 2244 int amode; 2245 } */ *uap; 2246 { 2247 2248 return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->amode)); 2249 } 2250 2251 int 2252 kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int amode) 2253 { 2254 2255 return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, amode)); 2256 } 2257 2258 #if defined(COMPAT_43) 2259 /* 2260 * Get file status; this version follows links. 2261 */ 2262 #ifndef _SYS_SYSPROTO_H_ 2263 struct ostat_args { 2264 char *path; 2265 struct ostat *ub; 2266 }; 2267 #endif 2268 int 2269 ostat(td, uap) 2270 struct thread *td; 2271 register struct ostat_args /* { 2272 char *path; 2273 struct ostat *ub; 2274 } */ *uap; 2275 { 2276 struct stat sb; 2277 struct ostat osb; 2278 int error; 2279 2280 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); 2281 if (error) 2282 return (error); 2283 cvtstat(&sb, &osb); 2284 error = copyout(&osb, uap->ub, sizeof (osb)); 2285 return (error); 2286 } 2287 2288 /* 2289 * Get file status; this version does not follow links. 2290 */ 2291 #ifndef _SYS_SYSPROTO_H_ 2292 struct olstat_args { 2293 char *path; 2294 struct ostat *ub; 2295 }; 2296 #endif 2297 int 2298 olstat(td, uap) 2299 struct thread *td; 2300 register struct olstat_args /* { 2301 char *path; 2302 struct ostat *ub; 2303 } */ *uap; 2304 { 2305 struct stat sb; 2306 struct ostat osb; 2307 int error; 2308 2309 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); 2310 if (error) 2311 return (error); 2312 cvtstat(&sb, &osb); 2313 error = copyout(&osb, uap->ub, sizeof (osb)); 2314 return (error); 2315 } 2316 2317 /* 2318 * Convert from an old to a new stat structure. 2319 */ 2320 void 2321 cvtstat(st, ost) 2322 struct stat *st; 2323 struct ostat *ost; 2324 { 2325 2326 ost->st_dev = st->st_dev; 2327 ost->st_ino = st->st_ino; 2328 ost->st_mode = st->st_mode; 2329 ost->st_nlink = st->st_nlink; 2330 ost->st_uid = st->st_uid; 2331 ost->st_gid = st->st_gid; 2332 ost->st_rdev = st->st_rdev; 2333 if (st->st_size < (quad_t)1 << 32) 2334 ost->st_size = st->st_size; 2335 else 2336 ost->st_size = -2; 2337 ost->st_atim = st->st_atim; 2338 ost->st_mtim = st->st_mtim; 2339 ost->st_ctim = st->st_ctim; 2340 ost->st_blksize = st->st_blksize; 2341 ost->st_blocks = st->st_blocks; 2342 ost->st_flags = st->st_flags; 2343 ost->st_gen = st->st_gen; 2344 } 2345 #endif /* COMPAT_43 */ 2346 2347 /* 2348 * Get file status; this version follows links. 2349 */ 2350 #ifndef _SYS_SYSPROTO_H_ 2351 struct stat_args { 2352 char *path; 2353 struct stat *ub; 2354 }; 2355 #endif 2356 int 2357 sys_stat(td, uap) 2358 struct thread *td; 2359 register struct stat_args /* { 2360 char *path; 2361 struct stat *ub; 2362 } */ *uap; 2363 { 2364 struct stat sb; 2365 int error; 2366 2367 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); 2368 if (error == 0) 2369 error = copyout(&sb, uap->ub, sizeof (sb)); 2370 return (error); 2371 } 2372 2373 #ifndef _SYS_SYSPROTO_H_ 2374 struct fstatat_args { 2375 int fd; 2376 char *path; 2377 struct stat *buf; 2378 int flag; 2379 } 2380 #endif 2381 int 2382 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2383 { 2384 struct stat sb; 2385 int error; 2386 2387 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2388 UIO_USERSPACE, &sb); 2389 if (error == 0) 2390 error = copyout(&sb, uap->buf, sizeof (sb)); 2391 return (error); 2392 } 2393 2394 int 2395 kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp) 2396 { 2397 2398 return (kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp)); 2399 } 2400 2401 int 2402 kern_statat(struct thread *td, int flag, int fd, char *path, 2403 enum uio_seg pathseg, struct stat *sbp) 2404 { 2405 2406 return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, NULL)); 2407 } 2408 2409 int 2410 kern_statat_vnhook(struct thread *td, int flag, int fd, char *path, 2411 enum uio_seg pathseg, struct stat *sbp, 2412 void (*hook)(struct vnode *vp, struct stat *sbp)) 2413 { 2414 struct nameidata nd; 2415 struct stat sb; 2416 int error, vfslocked; 2417 2418 if (flag & ~AT_SYMLINK_NOFOLLOW) 2419 return (EINVAL); 2420 2421 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 2422 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | MPSAFE, pathseg, 2423 path, fd, CAP_FSTAT, td); 2424 2425 if ((error = namei(&nd)) != 0) 2426 return (error); 2427 vfslocked = NDHASGIANT(&nd); 2428 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 2429 if (!error) { 2430 SDT_PROBE(vfs, , stat, mode, path, sb.st_mode, 0, 0, 0); 2431 if (S_ISREG(sb.st_mode)) 2432 SDT_PROBE(vfs, , stat, reg, path, pathseg, 0, 0, 0); 2433 if (__predict_false(hook != NULL)) 2434 hook(nd.ni_vp, &sb); 2435 } 2436 NDFREE(&nd, NDF_ONLY_PNBUF); 2437 vput(nd.ni_vp); 2438 VFS_UNLOCK_GIANT(vfslocked); 2439 if (error) 2440 return (error); 2441 *sbp = sb; 2442 #ifdef KTRACE 2443 if (KTRPOINT(td, KTR_STRUCT)) 2444 ktrstat(&sb); 2445 #endif 2446 return (0); 2447 } 2448 2449 /* 2450 * Get file status; this version does not follow links. 2451 */ 2452 #ifndef _SYS_SYSPROTO_H_ 2453 struct lstat_args { 2454 char *path; 2455 struct stat *ub; 2456 }; 2457 #endif 2458 int 2459 sys_lstat(td, uap) 2460 struct thread *td; 2461 register struct lstat_args /* { 2462 char *path; 2463 struct stat *ub; 2464 } */ *uap; 2465 { 2466 struct stat sb; 2467 int error; 2468 2469 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); 2470 if (error == 0) 2471 error = copyout(&sb, uap->ub, sizeof (sb)); 2472 return (error); 2473 } 2474 2475 int 2476 kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp) 2477 { 2478 2479 return (kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, pathseg, 2480 sbp)); 2481 } 2482 2483 /* 2484 * Implementation of the NetBSD [l]stat() functions. 2485 */ 2486 void 2487 cvtnstat(sb, nsb) 2488 struct stat *sb; 2489 struct nstat *nsb; 2490 { 2491 bzero(nsb, sizeof *nsb); 2492 nsb->st_dev = sb->st_dev; 2493 nsb->st_ino = sb->st_ino; 2494 nsb->st_mode = sb->st_mode; 2495 nsb->st_nlink = sb->st_nlink; 2496 nsb->st_uid = sb->st_uid; 2497 nsb->st_gid = sb->st_gid; 2498 nsb->st_rdev = sb->st_rdev; 2499 nsb->st_atim = sb->st_atim; 2500 nsb->st_mtim = sb->st_mtim; 2501 nsb->st_ctim = sb->st_ctim; 2502 nsb->st_size = sb->st_size; 2503 nsb->st_blocks = sb->st_blocks; 2504 nsb->st_blksize = sb->st_blksize; 2505 nsb->st_flags = sb->st_flags; 2506 nsb->st_gen = sb->st_gen; 2507 nsb->st_birthtim = sb->st_birthtim; 2508 } 2509 2510 #ifndef _SYS_SYSPROTO_H_ 2511 struct nstat_args { 2512 char *path; 2513 struct nstat *ub; 2514 }; 2515 #endif 2516 int 2517 sys_nstat(td, uap) 2518 struct thread *td; 2519 register struct nstat_args /* { 2520 char *path; 2521 struct nstat *ub; 2522 } */ *uap; 2523 { 2524 struct stat sb; 2525 struct nstat nsb; 2526 int error; 2527 2528 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); 2529 if (error) 2530 return (error); 2531 cvtnstat(&sb, &nsb); 2532 error = copyout(&nsb, uap->ub, sizeof (nsb)); 2533 return (error); 2534 } 2535 2536 /* 2537 * NetBSD lstat. Get file status; this version does not follow links. 2538 */ 2539 #ifndef _SYS_SYSPROTO_H_ 2540 struct lstat_args { 2541 char *path; 2542 struct stat *ub; 2543 }; 2544 #endif 2545 int 2546 sys_nlstat(td, uap) 2547 struct thread *td; 2548 register struct nlstat_args /* { 2549 char *path; 2550 struct nstat *ub; 2551 } */ *uap; 2552 { 2553 struct stat sb; 2554 struct nstat nsb; 2555 int error; 2556 2557 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); 2558 if (error) 2559 return (error); 2560 cvtnstat(&sb, &nsb); 2561 error = copyout(&nsb, uap->ub, sizeof (nsb)); 2562 return (error); 2563 } 2564 2565 /* 2566 * Get configurable pathname variables. 2567 */ 2568 #ifndef _SYS_SYSPROTO_H_ 2569 struct pathconf_args { 2570 char *path; 2571 int name; 2572 }; 2573 #endif 2574 int 2575 sys_pathconf(td, uap) 2576 struct thread *td; 2577 register struct pathconf_args /* { 2578 char *path; 2579 int name; 2580 } */ *uap; 2581 { 2582 2583 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW)); 2584 } 2585 2586 #ifndef _SYS_SYSPROTO_H_ 2587 struct lpathconf_args { 2588 char *path; 2589 int name; 2590 }; 2591 #endif 2592 int 2593 sys_lpathconf(td, uap) 2594 struct thread *td; 2595 register struct lpathconf_args /* { 2596 char *path; 2597 int name; 2598 } */ *uap; 2599 { 2600 2601 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, NOFOLLOW)); 2602 } 2603 2604 int 2605 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name, 2606 u_long flags) 2607 { 2608 struct nameidata nd; 2609 int error, vfslocked; 2610 2611 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1 | 2612 flags, pathseg, path, td); 2613 if ((error = namei(&nd)) != 0) 2614 return (error); 2615 vfslocked = NDHASGIANT(&nd); 2616 NDFREE(&nd, NDF_ONLY_PNBUF); 2617 2618 /* If asynchronous I/O is available, it works for all files. */ 2619 if (name == _PC_ASYNC_IO) 2620 td->td_retval[0] = async_io_version; 2621 else 2622 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval); 2623 vput(nd.ni_vp); 2624 VFS_UNLOCK_GIANT(vfslocked); 2625 return (error); 2626 } 2627 2628 /* 2629 * Return target name of a symbolic link. 2630 */ 2631 #ifndef _SYS_SYSPROTO_H_ 2632 struct readlink_args { 2633 char *path; 2634 char *buf; 2635 size_t count; 2636 }; 2637 #endif 2638 int 2639 sys_readlink(td, uap) 2640 struct thread *td; 2641 register struct readlink_args /* { 2642 char *path; 2643 char *buf; 2644 size_t count; 2645 } */ *uap; 2646 { 2647 2648 return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf, 2649 UIO_USERSPACE, uap->count)); 2650 } 2651 #ifndef _SYS_SYSPROTO_H_ 2652 struct readlinkat_args { 2653 int fd; 2654 char *path; 2655 char *buf; 2656 size_t bufsize; 2657 }; 2658 #endif 2659 int 2660 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2661 { 2662 2663 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2664 uap->buf, UIO_USERSPACE, uap->bufsize)); 2665 } 2666 2667 int 2668 kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf, 2669 enum uio_seg bufseg, size_t count) 2670 { 2671 2672 return (kern_readlinkat(td, AT_FDCWD, path, pathseg, buf, bufseg, 2673 count)); 2674 } 2675 2676 int 2677 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2678 char *buf, enum uio_seg bufseg, size_t count) 2679 { 2680 struct vnode *vp; 2681 struct iovec aiov; 2682 struct uio auio; 2683 int error; 2684 struct nameidata nd; 2685 int vfslocked; 2686 2687 if (count > INT_MAX) 2688 return (EINVAL); 2689 2690 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | 2691 AUDITVNODE1, pathseg, path, fd, td); 2692 2693 if ((error = namei(&nd)) != 0) 2694 return (error); 2695 NDFREE(&nd, NDF_ONLY_PNBUF); 2696 vfslocked = NDHASGIANT(&nd); 2697 vp = nd.ni_vp; 2698 #ifdef MAC 2699 error = mac_vnode_check_readlink(td->td_ucred, vp); 2700 if (error) { 2701 vput(vp); 2702 VFS_UNLOCK_GIANT(vfslocked); 2703 return (error); 2704 } 2705 #endif 2706 if (vp->v_type != VLNK) 2707 error = EINVAL; 2708 else { 2709 aiov.iov_base = buf; 2710 aiov.iov_len = count; 2711 auio.uio_iov = &aiov; 2712 auio.uio_iovcnt = 1; 2713 auio.uio_offset = 0; 2714 auio.uio_rw = UIO_READ; 2715 auio.uio_segflg = bufseg; 2716 auio.uio_td = td; 2717 auio.uio_resid = count; 2718 error = VOP_READLINK(vp, &auio, td->td_ucred); 2719 } 2720 vput(vp); 2721 VFS_UNLOCK_GIANT(vfslocked); 2722 td->td_retval[0] = count - auio.uio_resid; 2723 return (error); 2724 } 2725 2726 /* 2727 * Common implementation code for chflags() and fchflags(). 2728 */ 2729 static int 2730 setfflags(td, vp, flags) 2731 struct thread *td; 2732 struct vnode *vp; 2733 int flags; 2734 { 2735 int error; 2736 struct mount *mp; 2737 struct vattr vattr; 2738 2739 /* 2740 * Prevent non-root users from setting flags on devices. When 2741 * a device is reused, users can retain ownership of the device 2742 * if they are allowed to set flags and programs assume that 2743 * chown can't fail when done as root. 2744 */ 2745 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2746 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2747 if (error) 2748 return (error); 2749 } 2750 2751 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2752 return (error); 2753 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2754 VATTR_NULL(&vattr); 2755 vattr.va_flags = flags; 2756 #ifdef MAC 2757 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2758 if (error == 0) 2759 #endif 2760 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2761 VOP_UNLOCK(vp, 0); 2762 vn_finished_write(mp); 2763 return (error); 2764 } 2765 2766 /* 2767 * Change flags of a file given a path name. 2768 */ 2769 #ifndef _SYS_SYSPROTO_H_ 2770 struct chflags_args { 2771 char *path; 2772 int flags; 2773 }; 2774 #endif 2775 int 2776 sys_chflags(td, uap) 2777 struct thread *td; 2778 register struct chflags_args /* { 2779 char *path; 2780 int flags; 2781 } */ *uap; 2782 { 2783 int error; 2784 struct nameidata nd; 2785 int vfslocked; 2786 2787 AUDIT_ARG_FFLAGS(uap->flags); 2788 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE, 2789 uap->path, td); 2790 if ((error = namei(&nd)) != 0) 2791 return (error); 2792 NDFREE(&nd, NDF_ONLY_PNBUF); 2793 vfslocked = NDHASGIANT(&nd); 2794 error = setfflags(td, nd.ni_vp, uap->flags); 2795 vrele(nd.ni_vp); 2796 VFS_UNLOCK_GIANT(vfslocked); 2797 return (error); 2798 } 2799 2800 /* 2801 * Same as chflags() but doesn't follow symlinks. 2802 */ 2803 int 2804 sys_lchflags(td, uap) 2805 struct thread *td; 2806 register struct lchflags_args /* { 2807 char *path; 2808 int flags; 2809 } */ *uap; 2810 { 2811 int error; 2812 struct nameidata nd; 2813 int vfslocked; 2814 2815 AUDIT_ARG_FFLAGS(uap->flags); 2816 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE, 2817 uap->path, td); 2818 if ((error = namei(&nd)) != 0) 2819 return (error); 2820 vfslocked = NDHASGIANT(&nd); 2821 NDFREE(&nd, NDF_ONLY_PNBUF); 2822 error = setfflags(td, nd.ni_vp, uap->flags); 2823 vrele(nd.ni_vp); 2824 VFS_UNLOCK_GIANT(vfslocked); 2825 return (error); 2826 } 2827 2828 /* 2829 * Change flags of a file given a file descriptor. 2830 */ 2831 #ifndef _SYS_SYSPROTO_H_ 2832 struct fchflags_args { 2833 int fd; 2834 int flags; 2835 }; 2836 #endif 2837 int 2838 sys_fchflags(td, uap) 2839 struct thread *td; 2840 register struct fchflags_args /* { 2841 int fd; 2842 int flags; 2843 } */ *uap; 2844 { 2845 struct file *fp; 2846 int vfslocked; 2847 int error; 2848 2849 AUDIT_ARG_FD(uap->fd); 2850 AUDIT_ARG_FFLAGS(uap->flags); 2851 if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_FCHFLAGS, 2852 &fp)) != 0) 2853 return (error); 2854 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); 2855 #ifdef AUDIT 2856 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2857 AUDIT_ARG_VNODE1(fp->f_vnode); 2858 VOP_UNLOCK(fp->f_vnode, 0); 2859 #endif 2860 error = setfflags(td, fp->f_vnode, uap->flags); 2861 VFS_UNLOCK_GIANT(vfslocked); 2862 fdrop(fp, td); 2863 return (error); 2864 } 2865 2866 /* 2867 * Common implementation code for chmod(), lchmod() and fchmod(). 2868 */ 2869 int 2870 setfmode(td, cred, vp, mode) 2871 struct thread *td; 2872 struct ucred *cred; 2873 struct vnode *vp; 2874 int mode; 2875 { 2876 int error; 2877 struct mount *mp; 2878 struct vattr vattr; 2879 2880 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2881 return (error); 2882 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2883 VATTR_NULL(&vattr); 2884 vattr.va_mode = mode & ALLPERMS; 2885 #ifdef MAC 2886 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2887 if (error == 0) 2888 #endif 2889 error = VOP_SETATTR(vp, &vattr, cred); 2890 VOP_UNLOCK(vp, 0); 2891 vn_finished_write(mp); 2892 return (error); 2893 } 2894 2895 /* 2896 * Change mode of a file given path name. 2897 */ 2898 #ifndef _SYS_SYSPROTO_H_ 2899 struct chmod_args { 2900 char *path; 2901 int mode; 2902 }; 2903 #endif 2904 int 2905 sys_chmod(td, uap) 2906 struct thread *td; 2907 register struct chmod_args /* { 2908 char *path; 2909 int mode; 2910 } */ *uap; 2911 { 2912 2913 return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode)); 2914 } 2915 2916 #ifndef _SYS_SYSPROTO_H_ 2917 struct fchmodat_args { 2918 int dirfd; 2919 char *path; 2920 mode_t mode; 2921 int flag; 2922 } 2923 #endif 2924 int 2925 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2926 { 2927 int flag = uap->flag; 2928 int fd = uap->fd; 2929 char *path = uap->path; 2930 mode_t mode = uap->mode; 2931 2932 if (flag & ~AT_SYMLINK_NOFOLLOW) 2933 return (EINVAL); 2934 2935 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag)); 2936 } 2937 2938 int 2939 kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode) 2940 { 2941 2942 return (kern_fchmodat(td, AT_FDCWD, path, pathseg, mode, 0)); 2943 } 2944 2945 /* 2946 * Change mode of a file given path name (don't follow links.) 2947 */ 2948 #ifndef _SYS_SYSPROTO_H_ 2949 struct lchmod_args { 2950 char *path; 2951 int mode; 2952 }; 2953 #endif 2954 int 2955 sys_lchmod(td, uap) 2956 struct thread *td; 2957 register struct lchmod_args /* { 2958 char *path; 2959 int mode; 2960 } */ *uap; 2961 { 2962 2963 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2964 uap->mode, AT_SYMLINK_NOFOLLOW)); 2965 } 2966 2967 2968 int 2969 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2970 mode_t mode, int flag) 2971 { 2972 int error; 2973 struct nameidata nd; 2974 int vfslocked; 2975 int follow; 2976 2977 AUDIT_ARG_MODE(mode); 2978 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2979 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, pathseg, 2980 path, fd, CAP_FCHMOD, td); 2981 if ((error = namei(&nd)) != 0) 2982 return (error); 2983 vfslocked = NDHASGIANT(&nd); 2984 NDFREE(&nd, NDF_ONLY_PNBUF); 2985 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2986 vrele(nd.ni_vp); 2987 VFS_UNLOCK_GIANT(vfslocked); 2988 return (error); 2989 } 2990 2991 /* 2992 * Change mode of a file given a file descriptor. 2993 */ 2994 #ifndef _SYS_SYSPROTO_H_ 2995 struct fchmod_args { 2996 int fd; 2997 int mode; 2998 }; 2999 #endif 3000 int 3001 sys_fchmod(struct thread *td, struct fchmod_args *uap) 3002 { 3003 struct file *fp; 3004 int error; 3005 3006 AUDIT_ARG_FD(uap->fd); 3007 AUDIT_ARG_MODE(uap->mode); 3008 3009 error = fget(td, uap->fd, CAP_FCHMOD, &fp); 3010 if (error != 0) 3011 return (error); 3012 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 3013 fdrop(fp, td); 3014 return (error); 3015 } 3016 3017 /* 3018 * Common implementation for chown(), lchown(), and fchown() 3019 */ 3020 int 3021 setfown(td, cred, vp, uid, gid) 3022 struct thread *td; 3023 struct ucred *cred; 3024 struct vnode *vp; 3025 uid_t uid; 3026 gid_t gid; 3027 { 3028 int error; 3029 struct mount *mp; 3030 struct vattr vattr; 3031 3032 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3033 return (error); 3034 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3035 VATTR_NULL(&vattr); 3036 vattr.va_uid = uid; 3037 vattr.va_gid = gid; 3038 #ifdef MAC 3039 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 3040 vattr.va_gid); 3041 if (error == 0) 3042 #endif 3043 error = VOP_SETATTR(vp, &vattr, cred); 3044 VOP_UNLOCK(vp, 0); 3045 vn_finished_write(mp); 3046 return (error); 3047 } 3048 3049 /* 3050 * Set ownership given a path name. 3051 */ 3052 #ifndef _SYS_SYSPROTO_H_ 3053 struct chown_args { 3054 char *path; 3055 int uid; 3056 int gid; 3057 }; 3058 #endif 3059 int 3060 sys_chown(td, uap) 3061 struct thread *td; 3062 register struct chown_args /* { 3063 char *path; 3064 int uid; 3065 int gid; 3066 } */ *uap; 3067 { 3068 3069 return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid)); 3070 } 3071 3072 #ifndef _SYS_SYSPROTO_H_ 3073 struct fchownat_args { 3074 int fd; 3075 const char * path; 3076 uid_t uid; 3077 gid_t gid; 3078 int flag; 3079 }; 3080 #endif 3081 int 3082 sys_fchownat(struct thread *td, struct fchownat_args *uap) 3083 { 3084 int flag; 3085 3086 flag = uap->flag; 3087 if (flag & ~AT_SYMLINK_NOFOLLOW) 3088 return (EINVAL); 3089 3090 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 3091 uap->gid, uap->flag)); 3092 } 3093 3094 int 3095 kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid, 3096 int gid) 3097 { 3098 3099 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 0)); 3100 } 3101 3102 int 3103 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3104 int uid, int gid, int flag) 3105 { 3106 struct nameidata nd; 3107 int error, vfslocked, follow; 3108 3109 AUDIT_ARG_OWNER(uid, gid); 3110 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 3111 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, pathseg, 3112 path, fd, CAP_FCHOWN, td); 3113 3114 if ((error = namei(&nd)) != 0) 3115 return (error); 3116 vfslocked = NDHASGIANT(&nd); 3117 NDFREE(&nd, NDF_ONLY_PNBUF); 3118 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 3119 vrele(nd.ni_vp); 3120 VFS_UNLOCK_GIANT(vfslocked); 3121 return (error); 3122 } 3123 3124 /* 3125 * Set ownership given a path name, do not cross symlinks. 3126 */ 3127 #ifndef _SYS_SYSPROTO_H_ 3128 struct lchown_args { 3129 char *path; 3130 int uid; 3131 int gid; 3132 }; 3133 #endif 3134 int 3135 sys_lchown(td, uap) 3136 struct thread *td; 3137 register struct lchown_args /* { 3138 char *path; 3139 int uid; 3140 int gid; 3141 } */ *uap; 3142 { 3143 3144 return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid)); 3145 } 3146 3147 int 3148 kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid, 3149 int gid) 3150 { 3151 3152 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 3153 AT_SYMLINK_NOFOLLOW)); 3154 } 3155 3156 /* 3157 * Set ownership given a file descriptor. 3158 */ 3159 #ifndef _SYS_SYSPROTO_H_ 3160 struct fchown_args { 3161 int fd; 3162 int uid; 3163 int gid; 3164 }; 3165 #endif 3166 int 3167 sys_fchown(td, uap) 3168 struct thread *td; 3169 register struct fchown_args /* { 3170 int fd; 3171 int uid; 3172 int gid; 3173 } */ *uap; 3174 { 3175 struct file *fp; 3176 int error; 3177 3178 AUDIT_ARG_FD(uap->fd); 3179 AUDIT_ARG_OWNER(uap->uid, uap->gid); 3180 error = fget(td, uap->fd, CAP_FCHOWN, &fp); 3181 if (error != 0) 3182 return (error); 3183 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 3184 fdrop(fp, td); 3185 return (error); 3186 } 3187 3188 /* 3189 * Common implementation code for utimes(), lutimes(), and futimes(). 3190 */ 3191 static int 3192 getutimes(usrtvp, tvpseg, tsp) 3193 const struct timeval *usrtvp; 3194 enum uio_seg tvpseg; 3195 struct timespec *tsp; 3196 { 3197 struct timeval tv[2]; 3198 const struct timeval *tvp; 3199 int error; 3200 3201 if (usrtvp == NULL) { 3202 vfs_timestamp(&tsp[0]); 3203 tsp[1] = tsp[0]; 3204 } else { 3205 if (tvpseg == UIO_SYSSPACE) { 3206 tvp = usrtvp; 3207 } else { 3208 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3209 return (error); 3210 tvp = tv; 3211 } 3212 3213 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3214 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3215 return (EINVAL); 3216 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3217 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3218 } 3219 return (0); 3220 } 3221 3222 /* 3223 * Common implementation code for utimes(), lutimes(), and futimes(). 3224 */ 3225 static int 3226 setutimes(td, vp, ts, numtimes, nullflag) 3227 struct thread *td; 3228 struct vnode *vp; 3229 const struct timespec *ts; 3230 int numtimes; 3231 int nullflag; 3232 { 3233 int error, setbirthtime; 3234 struct mount *mp; 3235 struct vattr vattr; 3236 3237 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3238 return (error); 3239 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3240 setbirthtime = 0; 3241 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3242 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3243 setbirthtime = 1; 3244 VATTR_NULL(&vattr); 3245 vattr.va_atime = ts[0]; 3246 vattr.va_mtime = ts[1]; 3247 if (setbirthtime) 3248 vattr.va_birthtime = ts[1]; 3249 if (numtimes > 2) 3250 vattr.va_birthtime = ts[2]; 3251 if (nullflag) 3252 vattr.va_vaflags |= VA_UTIMES_NULL; 3253 #ifdef MAC 3254 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3255 vattr.va_mtime); 3256 #endif 3257 if (error == 0) 3258 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3259 VOP_UNLOCK(vp, 0); 3260 vn_finished_write(mp); 3261 return (error); 3262 } 3263 3264 /* 3265 * Set the access and modification times of a file. 3266 */ 3267 #ifndef _SYS_SYSPROTO_H_ 3268 struct utimes_args { 3269 char *path; 3270 struct timeval *tptr; 3271 }; 3272 #endif 3273 int 3274 sys_utimes(td, uap) 3275 struct thread *td; 3276 register struct utimes_args /* { 3277 char *path; 3278 struct timeval *tptr; 3279 } */ *uap; 3280 { 3281 3282 return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3283 UIO_USERSPACE)); 3284 } 3285 3286 #ifndef _SYS_SYSPROTO_H_ 3287 struct futimesat_args { 3288 int fd; 3289 const char * path; 3290 const struct timeval * times; 3291 }; 3292 #endif 3293 int 3294 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3295 { 3296 3297 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3298 uap->times, UIO_USERSPACE)); 3299 } 3300 3301 int 3302 kern_utimes(struct thread *td, char *path, enum uio_seg pathseg, 3303 struct timeval *tptr, enum uio_seg tptrseg) 3304 { 3305 3306 return (kern_utimesat(td, AT_FDCWD, path, pathseg, tptr, tptrseg)); 3307 } 3308 3309 int 3310 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3311 struct timeval *tptr, enum uio_seg tptrseg) 3312 { 3313 struct nameidata nd; 3314 struct timespec ts[2]; 3315 int error, vfslocked; 3316 3317 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3318 return (error); 3319 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, 3320 path, fd, CAP_FUTIMES, td); 3321 3322 if ((error = namei(&nd)) != 0) 3323 return (error); 3324 vfslocked = NDHASGIANT(&nd); 3325 NDFREE(&nd, NDF_ONLY_PNBUF); 3326 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3327 vrele(nd.ni_vp); 3328 VFS_UNLOCK_GIANT(vfslocked); 3329 return (error); 3330 } 3331 3332 /* 3333 * Set the access and modification times of a file. 3334 */ 3335 #ifndef _SYS_SYSPROTO_H_ 3336 struct lutimes_args { 3337 char *path; 3338 struct timeval *tptr; 3339 }; 3340 #endif 3341 int 3342 sys_lutimes(td, uap) 3343 struct thread *td; 3344 register struct lutimes_args /* { 3345 char *path; 3346 struct timeval *tptr; 3347 } */ *uap; 3348 { 3349 3350 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3351 UIO_USERSPACE)); 3352 } 3353 3354 int 3355 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, 3356 struct timeval *tptr, enum uio_seg tptrseg) 3357 { 3358 struct timespec ts[2]; 3359 int error; 3360 struct nameidata nd; 3361 int vfslocked; 3362 3363 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3364 return (error); 3365 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); 3366 if ((error = namei(&nd)) != 0) 3367 return (error); 3368 vfslocked = NDHASGIANT(&nd); 3369 NDFREE(&nd, NDF_ONLY_PNBUF); 3370 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3371 vrele(nd.ni_vp); 3372 VFS_UNLOCK_GIANT(vfslocked); 3373 return (error); 3374 } 3375 3376 /* 3377 * Set the access and modification times of a file. 3378 */ 3379 #ifndef _SYS_SYSPROTO_H_ 3380 struct futimes_args { 3381 int fd; 3382 struct timeval *tptr; 3383 }; 3384 #endif 3385 int 3386 sys_futimes(td, uap) 3387 struct thread *td; 3388 register struct futimes_args /* { 3389 int fd; 3390 struct timeval *tptr; 3391 } */ *uap; 3392 { 3393 3394 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3395 } 3396 3397 int 3398 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3399 enum uio_seg tptrseg) 3400 { 3401 struct timespec ts[2]; 3402 struct file *fp; 3403 int vfslocked; 3404 int error; 3405 3406 AUDIT_ARG_FD(fd); 3407 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3408 return (error); 3409 if ((error = getvnode(td->td_proc->p_fd, fd, CAP_FUTIMES, &fp)) 3410 != 0) 3411 return (error); 3412 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); 3413 #ifdef AUDIT 3414 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3415 AUDIT_ARG_VNODE1(fp->f_vnode); 3416 VOP_UNLOCK(fp->f_vnode, 0); 3417 #endif 3418 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3419 VFS_UNLOCK_GIANT(vfslocked); 3420 fdrop(fp, td); 3421 return (error); 3422 } 3423 3424 /* 3425 * Truncate a file given its path name. 3426 */ 3427 #ifndef _SYS_SYSPROTO_H_ 3428 struct truncate_args { 3429 char *path; 3430 int pad; 3431 off_t length; 3432 }; 3433 #endif 3434 int 3435 sys_truncate(td, uap) 3436 struct thread *td; 3437 register struct truncate_args /* { 3438 char *path; 3439 int pad; 3440 off_t length; 3441 } */ *uap; 3442 { 3443 3444 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3445 } 3446 3447 int 3448 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) 3449 { 3450 struct mount *mp; 3451 struct vnode *vp; 3452 struct vattr vattr; 3453 int error; 3454 struct nameidata nd; 3455 int vfslocked; 3456 3457 if (length < 0) 3458 return(EINVAL); 3459 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); 3460 if ((error = namei(&nd)) != 0) 3461 return (error); 3462 vfslocked = NDHASGIANT(&nd); 3463 vp = nd.ni_vp; 3464 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3465 vrele(vp); 3466 VFS_UNLOCK_GIANT(vfslocked); 3467 return (error); 3468 } 3469 NDFREE(&nd, NDF_ONLY_PNBUF); 3470 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3471 if (vp->v_type == VDIR) 3472 error = EISDIR; 3473 #ifdef MAC 3474 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3475 } 3476 #endif 3477 else if ((error = vn_writechk(vp)) == 0 && 3478 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3479 VATTR_NULL(&vattr); 3480 vattr.va_size = length; 3481 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3482 } 3483 vput(vp); 3484 vn_finished_write(mp); 3485 VFS_UNLOCK_GIANT(vfslocked); 3486 return (error); 3487 } 3488 3489 #if defined(COMPAT_43) 3490 /* 3491 * Truncate a file given its path name. 3492 */ 3493 #ifndef _SYS_SYSPROTO_H_ 3494 struct otruncate_args { 3495 char *path; 3496 long length; 3497 }; 3498 #endif 3499 int 3500 otruncate(td, uap) 3501 struct thread *td; 3502 register struct otruncate_args /* { 3503 char *path; 3504 long length; 3505 } */ *uap; 3506 { 3507 struct truncate_args /* { 3508 char *path; 3509 int pad; 3510 off_t length; 3511 } */ nuap; 3512 3513 nuap.path = uap->path; 3514 nuap.length = uap->length; 3515 return (sys_truncate(td, &nuap)); 3516 } 3517 #endif /* COMPAT_43 */ 3518 3519 /* Versions with the pad argument */ 3520 int 3521 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3522 { 3523 struct truncate_args ouap; 3524 3525 ouap.path = uap->path; 3526 ouap.length = uap->length; 3527 return (sys_truncate(td, &ouap)); 3528 } 3529 3530 int 3531 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3532 { 3533 struct ftruncate_args ouap; 3534 3535 ouap.fd = uap->fd; 3536 ouap.length = uap->length; 3537 return (sys_ftruncate(td, &ouap)); 3538 } 3539 3540 /* 3541 * Sync an open file. 3542 */ 3543 #ifndef _SYS_SYSPROTO_H_ 3544 struct fsync_args { 3545 int fd; 3546 }; 3547 #endif 3548 int 3549 sys_fsync(td, uap) 3550 struct thread *td; 3551 struct fsync_args /* { 3552 int fd; 3553 } */ *uap; 3554 { 3555 struct vnode *vp; 3556 struct mount *mp; 3557 struct file *fp; 3558 int vfslocked; 3559 int error, lock_flags; 3560 3561 AUDIT_ARG_FD(uap->fd); 3562 if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_FSYNC, 3563 &fp)) != 0) 3564 return (error); 3565 vp = fp->f_vnode; 3566 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 3567 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3568 goto drop; 3569 if (MNT_SHARED_WRITES(mp) || 3570 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3571 lock_flags = LK_SHARED; 3572 } else { 3573 lock_flags = LK_EXCLUSIVE; 3574 } 3575 vn_lock(vp, lock_flags | LK_RETRY); 3576 AUDIT_ARG_VNODE1(vp); 3577 if (vp->v_object != NULL) { 3578 VM_OBJECT_LOCK(vp->v_object); 3579 vm_object_page_clean(vp->v_object, 0, 0, 0); 3580 VM_OBJECT_UNLOCK(vp->v_object); 3581 } 3582 error = VOP_FSYNC(vp, MNT_WAIT, td); 3583 3584 VOP_UNLOCK(vp, 0); 3585 vn_finished_write(mp); 3586 drop: 3587 VFS_UNLOCK_GIANT(vfslocked); 3588 fdrop(fp, td); 3589 return (error); 3590 } 3591 3592 /* 3593 * Rename files. Source and destination must either both be directories, or 3594 * both not be directories. If target is a directory, it must be empty. 3595 */ 3596 #ifndef _SYS_SYSPROTO_H_ 3597 struct rename_args { 3598 char *from; 3599 char *to; 3600 }; 3601 #endif 3602 int 3603 sys_rename(td, uap) 3604 struct thread *td; 3605 register struct rename_args /* { 3606 char *from; 3607 char *to; 3608 } */ *uap; 3609 { 3610 3611 return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE)); 3612 } 3613 3614 #ifndef _SYS_SYSPROTO_H_ 3615 struct renameat_args { 3616 int oldfd; 3617 char *old; 3618 int newfd; 3619 char *new; 3620 }; 3621 #endif 3622 int 3623 sys_renameat(struct thread *td, struct renameat_args *uap) 3624 { 3625 3626 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3627 UIO_USERSPACE)); 3628 } 3629 3630 int 3631 kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg) 3632 { 3633 3634 return (kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, pathseg)); 3635 } 3636 3637 int 3638 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new, 3639 enum uio_seg pathseg) 3640 { 3641 struct mount *mp = NULL; 3642 struct vnode *tvp, *fvp, *tdvp; 3643 struct nameidata fromnd, tond; 3644 int tvfslocked; 3645 int fvfslocked; 3646 int error; 3647 3648 bwillwrite(); 3649 #ifdef MAC 3650 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3651 MPSAFE | AUDITVNODE1, pathseg, old, oldfd, CAP_DELETE, td); 3652 #else 3653 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | MPSAFE | 3654 AUDITVNODE1, pathseg, old, oldfd, CAP_DELETE, td); 3655 #endif 3656 3657 if ((error = namei(&fromnd)) != 0) 3658 return (error); 3659 fvfslocked = NDHASGIANT(&fromnd); 3660 tvfslocked = 0; 3661 #ifdef MAC 3662 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3663 fromnd.ni_vp, &fromnd.ni_cnd); 3664 VOP_UNLOCK(fromnd.ni_dvp, 0); 3665 if (fromnd.ni_dvp != fromnd.ni_vp) 3666 VOP_UNLOCK(fromnd.ni_vp, 0); 3667 #endif 3668 fvp = fromnd.ni_vp; 3669 if (error == 0) 3670 error = vn_start_write(fvp, &mp, V_WAIT | PCATCH); 3671 if (error != 0) { 3672 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3673 vrele(fromnd.ni_dvp); 3674 vrele(fvp); 3675 goto out1; 3676 } 3677 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3678 SAVESTART | MPSAFE | AUDITVNODE2, pathseg, new, newfd, CAP_CREATE, 3679 td); 3680 if (fromnd.ni_vp->v_type == VDIR) 3681 tond.ni_cnd.cn_flags |= WILLBEDIR; 3682 if ((error = namei(&tond)) != 0) { 3683 /* Translate error code for rename("dir1", "dir2/."). */ 3684 if (error == EISDIR && fvp->v_type == VDIR) 3685 error = EINVAL; 3686 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3687 vrele(fromnd.ni_dvp); 3688 vrele(fvp); 3689 vn_finished_write(mp); 3690 goto out1; 3691 } 3692 tvfslocked = NDHASGIANT(&tond); 3693 tdvp = tond.ni_dvp; 3694 tvp = tond.ni_vp; 3695 if (tvp != NULL) { 3696 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3697 error = ENOTDIR; 3698 goto out; 3699 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3700 error = EISDIR; 3701 goto out; 3702 } 3703 } 3704 if (fvp == tdvp) { 3705 error = EINVAL; 3706 goto out; 3707 } 3708 /* 3709 * If the source is the same as the destination (that is, if they 3710 * are links to the same vnode), then there is nothing to do. 3711 */ 3712 if (fvp == tvp) 3713 error = -1; 3714 #ifdef MAC 3715 else 3716 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3717 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3718 #endif 3719 out: 3720 if (!error) { 3721 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3722 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3723 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3724 NDFREE(&tond, NDF_ONLY_PNBUF); 3725 } else { 3726 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3727 NDFREE(&tond, NDF_ONLY_PNBUF); 3728 if (tvp) 3729 vput(tvp); 3730 if (tdvp == tvp) 3731 vrele(tdvp); 3732 else 3733 vput(tdvp); 3734 vrele(fromnd.ni_dvp); 3735 vrele(fvp); 3736 } 3737 vrele(tond.ni_startdir); 3738 vn_finished_write(mp); 3739 out1: 3740 if (fromnd.ni_startdir) 3741 vrele(fromnd.ni_startdir); 3742 VFS_UNLOCK_GIANT(fvfslocked); 3743 VFS_UNLOCK_GIANT(tvfslocked); 3744 if (error == -1) 3745 return (0); 3746 return (error); 3747 } 3748 3749 /* 3750 * Make a directory file. 3751 */ 3752 #ifndef _SYS_SYSPROTO_H_ 3753 struct mkdir_args { 3754 char *path; 3755 int mode; 3756 }; 3757 #endif 3758 int 3759 sys_mkdir(td, uap) 3760 struct thread *td; 3761 register struct mkdir_args /* { 3762 char *path; 3763 int mode; 3764 } */ *uap; 3765 { 3766 3767 return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode)); 3768 } 3769 3770 #ifndef _SYS_SYSPROTO_H_ 3771 struct mkdirat_args { 3772 int fd; 3773 char *path; 3774 mode_t mode; 3775 }; 3776 #endif 3777 int 3778 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3779 { 3780 3781 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3782 } 3783 3784 int 3785 kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode) 3786 { 3787 3788 return (kern_mkdirat(td, AT_FDCWD, path, segflg, mode)); 3789 } 3790 3791 int 3792 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg, 3793 int mode) 3794 { 3795 struct mount *mp; 3796 struct vnode *vp; 3797 struct vattr vattr; 3798 int error; 3799 struct nameidata nd; 3800 int vfslocked; 3801 3802 AUDIT_ARG_MODE(mode); 3803 restart: 3804 bwillwrite(); 3805 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | 3806 AUDITVNODE1, segflg, path, fd, CAP_MKDIR, td); 3807 nd.ni_cnd.cn_flags |= WILLBEDIR; 3808 if ((error = namei(&nd)) != 0) 3809 return (error); 3810 vfslocked = NDHASGIANT(&nd); 3811 vp = nd.ni_vp; 3812 if (vp != NULL) { 3813 NDFREE(&nd, NDF_ONLY_PNBUF); 3814 /* 3815 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3816 * the strange behaviour of leaving the vnode unlocked 3817 * if the target is the same vnode as the parent. 3818 */ 3819 if (vp == nd.ni_dvp) 3820 vrele(nd.ni_dvp); 3821 else 3822 vput(nd.ni_dvp); 3823 vrele(vp); 3824 VFS_UNLOCK_GIANT(vfslocked); 3825 return (EEXIST); 3826 } 3827 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3828 NDFREE(&nd, NDF_ONLY_PNBUF); 3829 vput(nd.ni_dvp); 3830 VFS_UNLOCK_GIANT(vfslocked); 3831 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3832 return (error); 3833 goto restart; 3834 } 3835 VATTR_NULL(&vattr); 3836 vattr.va_type = VDIR; 3837 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3838 #ifdef MAC 3839 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3840 &vattr); 3841 if (error) 3842 goto out; 3843 #endif 3844 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3845 #ifdef MAC 3846 out: 3847 #endif 3848 NDFREE(&nd, NDF_ONLY_PNBUF); 3849 vput(nd.ni_dvp); 3850 if (!error) 3851 vput(nd.ni_vp); 3852 vn_finished_write(mp); 3853 VFS_UNLOCK_GIANT(vfslocked); 3854 return (error); 3855 } 3856 3857 /* 3858 * Remove a directory file. 3859 */ 3860 #ifndef _SYS_SYSPROTO_H_ 3861 struct rmdir_args { 3862 char *path; 3863 }; 3864 #endif 3865 int 3866 sys_rmdir(td, uap) 3867 struct thread *td; 3868 struct rmdir_args /* { 3869 char *path; 3870 } */ *uap; 3871 { 3872 3873 return (kern_rmdir(td, uap->path, UIO_USERSPACE)); 3874 } 3875 3876 int 3877 kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg) 3878 { 3879 3880 return (kern_rmdirat(td, AT_FDCWD, path, pathseg)); 3881 } 3882 3883 int 3884 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg) 3885 { 3886 struct mount *mp; 3887 struct vnode *vp; 3888 int error; 3889 struct nameidata nd; 3890 int vfslocked; 3891 3892 restart: 3893 bwillwrite(); 3894 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | 3895 AUDITVNODE1, pathseg, path, fd, CAP_RMDIR, td); 3896 if ((error = namei(&nd)) != 0) 3897 return (error); 3898 vfslocked = NDHASGIANT(&nd); 3899 vp = nd.ni_vp; 3900 if (vp->v_type != VDIR) { 3901 error = ENOTDIR; 3902 goto out; 3903 } 3904 /* 3905 * No rmdir "." please. 3906 */ 3907 if (nd.ni_dvp == vp) { 3908 error = EINVAL; 3909 goto out; 3910 } 3911 /* 3912 * The root of a mounted filesystem cannot be deleted. 3913 */ 3914 if (vp->v_vflag & VV_ROOT) { 3915 error = EBUSY; 3916 goto out; 3917 } 3918 #ifdef MAC 3919 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3920 &nd.ni_cnd); 3921 if (error) 3922 goto out; 3923 #endif 3924 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3925 NDFREE(&nd, NDF_ONLY_PNBUF); 3926 vput(vp); 3927 if (nd.ni_dvp == vp) 3928 vrele(nd.ni_dvp); 3929 else 3930 vput(nd.ni_dvp); 3931 VFS_UNLOCK_GIANT(vfslocked); 3932 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3933 return (error); 3934 goto restart; 3935 } 3936 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3937 vn_finished_write(mp); 3938 out: 3939 NDFREE(&nd, NDF_ONLY_PNBUF); 3940 vput(vp); 3941 if (nd.ni_dvp == vp) 3942 vrele(nd.ni_dvp); 3943 else 3944 vput(nd.ni_dvp); 3945 VFS_UNLOCK_GIANT(vfslocked); 3946 return (error); 3947 } 3948 3949 #ifdef COMPAT_43 3950 /* 3951 * Read a block of directory entries in a filesystem independent format. 3952 */ 3953 #ifndef _SYS_SYSPROTO_H_ 3954 struct ogetdirentries_args { 3955 int fd; 3956 char *buf; 3957 u_int count; 3958 long *basep; 3959 }; 3960 #endif 3961 int 3962 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3963 { 3964 long loff; 3965 int error; 3966 3967 error = kern_ogetdirentries(td, uap, &loff); 3968 if (error == 0) 3969 error = copyout(&loff, uap->basep, sizeof(long)); 3970 return (error); 3971 } 3972 3973 int 3974 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3975 long *ploff) 3976 { 3977 struct vnode *vp; 3978 struct file *fp; 3979 struct uio auio, kuio; 3980 struct iovec aiov, kiov; 3981 struct dirent *dp, *edp; 3982 caddr_t dirbuf; 3983 int error, eofflag, readcnt, vfslocked; 3984 long loff; 3985 3986 /* XXX arbitrary sanity limit on `count'. */ 3987 if (uap->count > 64 * 1024) 3988 return (EINVAL); 3989 if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_READ, 3990 &fp)) != 0) 3991 return (error); 3992 if ((fp->f_flag & FREAD) == 0) { 3993 fdrop(fp, td); 3994 return (EBADF); 3995 } 3996 vp = fp->f_vnode; 3997 unionread: 3998 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 3999 if (vp->v_type != VDIR) { 4000 VFS_UNLOCK_GIANT(vfslocked); 4001 fdrop(fp, td); 4002 return (EINVAL); 4003 } 4004 aiov.iov_base = uap->buf; 4005 aiov.iov_len = uap->count; 4006 auio.uio_iov = &aiov; 4007 auio.uio_iovcnt = 1; 4008 auio.uio_rw = UIO_READ; 4009 auio.uio_segflg = UIO_USERSPACE; 4010 auio.uio_td = td; 4011 auio.uio_resid = uap->count; 4012 vn_lock(vp, LK_SHARED | LK_RETRY); 4013 loff = auio.uio_offset = fp->f_offset; 4014 #ifdef MAC 4015 error = mac_vnode_check_readdir(td->td_ucred, vp); 4016 if (error) { 4017 VOP_UNLOCK(vp, 0); 4018 VFS_UNLOCK_GIANT(vfslocked); 4019 fdrop(fp, td); 4020 return (error); 4021 } 4022 #endif 4023 # if (BYTE_ORDER != LITTLE_ENDIAN) 4024 if (vp->v_mount->mnt_maxsymlinklen <= 0) { 4025 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 4026 NULL, NULL); 4027 fp->f_offset = auio.uio_offset; 4028 } else 4029 # endif 4030 { 4031 kuio = auio; 4032 kuio.uio_iov = &kiov; 4033 kuio.uio_segflg = UIO_SYSSPACE; 4034 kiov.iov_len = uap->count; 4035 dirbuf = malloc(uap->count, M_TEMP, M_WAITOK); 4036 kiov.iov_base = dirbuf; 4037 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 4038 NULL, NULL); 4039 fp->f_offset = kuio.uio_offset; 4040 if (error == 0) { 4041 readcnt = uap->count - kuio.uio_resid; 4042 edp = (struct dirent *)&dirbuf[readcnt]; 4043 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 4044 # if (BYTE_ORDER == LITTLE_ENDIAN) 4045 /* 4046 * The expected low byte of 4047 * dp->d_namlen is our dp->d_type. 4048 * The high MBZ byte of dp->d_namlen 4049 * is our dp->d_namlen. 4050 */ 4051 dp->d_type = dp->d_namlen; 4052 dp->d_namlen = 0; 4053 # else 4054 /* 4055 * The dp->d_type is the high byte 4056 * of the expected dp->d_namlen, 4057 * so must be zero'ed. 4058 */ 4059 dp->d_type = 0; 4060 # endif 4061 if (dp->d_reclen > 0) { 4062 dp = (struct dirent *) 4063 ((char *)dp + dp->d_reclen); 4064 } else { 4065 error = EIO; 4066 break; 4067 } 4068 } 4069 if (dp >= edp) 4070 error = uiomove(dirbuf, readcnt, &auio); 4071 } 4072 free(dirbuf, M_TEMP); 4073 } 4074 if (error) { 4075 VOP_UNLOCK(vp, 0); 4076 VFS_UNLOCK_GIANT(vfslocked); 4077 fdrop(fp, td); 4078 return (error); 4079 } 4080 if (uap->count == auio.uio_resid && 4081 (vp->v_vflag & VV_ROOT) && 4082 (vp->v_mount->mnt_flag & MNT_UNION)) { 4083 struct vnode *tvp = vp; 4084 vp = vp->v_mount->mnt_vnodecovered; 4085 VREF(vp); 4086 fp->f_vnode = vp; 4087 fp->f_data = vp; 4088 fp->f_offset = 0; 4089 vput(tvp); 4090 VFS_UNLOCK_GIANT(vfslocked); 4091 goto unionread; 4092 } 4093 VOP_UNLOCK(vp, 0); 4094 VFS_UNLOCK_GIANT(vfslocked); 4095 fdrop(fp, td); 4096 td->td_retval[0] = uap->count - auio.uio_resid; 4097 if (error == 0) 4098 *ploff = loff; 4099 return (error); 4100 } 4101 #endif /* COMPAT_43 */ 4102 4103 /* 4104 * Read a block of directory entries in a filesystem independent format. 4105 */ 4106 #ifndef _SYS_SYSPROTO_H_ 4107 struct getdirentries_args { 4108 int fd; 4109 char *buf; 4110 u_int count; 4111 long *basep; 4112 }; 4113 #endif 4114 int 4115 sys_getdirentries(td, uap) 4116 struct thread *td; 4117 register struct getdirentries_args /* { 4118 int fd; 4119 char *buf; 4120 u_int count; 4121 long *basep; 4122 } */ *uap; 4123 { 4124 long base; 4125 int error; 4126 4127 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base); 4128 if (error) 4129 return (error); 4130 if (uap->basep != NULL) 4131 error = copyout(&base, uap->basep, sizeof(long)); 4132 return (error); 4133 } 4134 4135 int 4136 kern_getdirentries(struct thread *td, int fd, char *buf, u_int count, 4137 long *basep) 4138 { 4139 struct vnode *vp; 4140 struct file *fp; 4141 struct uio auio; 4142 struct iovec aiov; 4143 int vfslocked; 4144 long loff; 4145 int error, eofflag; 4146 4147 AUDIT_ARG_FD(fd); 4148 if (count > INT_MAX) 4149 return (EINVAL); 4150 if ((error = getvnode(td->td_proc->p_fd, fd, CAP_READ | CAP_SEEK, 4151 &fp)) != 0) 4152 return (error); 4153 if ((fp->f_flag & FREAD) == 0) { 4154 fdrop(fp, td); 4155 return (EBADF); 4156 } 4157 vp = fp->f_vnode; 4158 unionread: 4159 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 4160 if (vp->v_type != VDIR) { 4161 VFS_UNLOCK_GIANT(vfslocked); 4162 error = EINVAL; 4163 goto fail; 4164 } 4165 aiov.iov_base = buf; 4166 aiov.iov_len = count; 4167 auio.uio_iov = &aiov; 4168 auio.uio_iovcnt = 1; 4169 auio.uio_rw = UIO_READ; 4170 auio.uio_segflg = UIO_USERSPACE; 4171 auio.uio_td = td; 4172 auio.uio_resid = count; 4173 vn_lock(vp, LK_SHARED | LK_RETRY); 4174 AUDIT_ARG_VNODE1(vp); 4175 loff = auio.uio_offset = fp->f_offset; 4176 #ifdef MAC 4177 error = mac_vnode_check_readdir(td->td_ucred, vp); 4178 if (error == 0) 4179 #endif 4180 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4181 NULL); 4182 fp->f_offset = auio.uio_offset; 4183 if (error) { 4184 VOP_UNLOCK(vp, 0); 4185 VFS_UNLOCK_GIANT(vfslocked); 4186 goto fail; 4187 } 4188 if (count == auio.uio_resid && 4189 (vp->v_vflag & VV_ROOT) && 4190 (vp->v_mount->mnt_flag & MNT_UNION)) { 4191 struct vnode *tvp = vp; 4192 vp = vp->v_mount->mnt_vnodecovered; 4193 VREF(vp); 4194 fp->f_vnode = vp; 4195 fp->f_data = vp; 4196 fp->f_offset = 0; 4197 vput(tvp); 4198 VFS_UNLOCK_GIANT(vfslocked); 4199 goto unionread; 4200 } 4201 VOP_UNLOCK(vp, 0); 4202 VFS_UNLOCK_GIANT(vfslocked); 4203 *basep = loff; 4204 td->td_retval[0] = count - auio.uio_resid; 4205 fail: 4206 fdrop(fp, td); 4207 return (error); 4208 } 4209 4210 #ifndef _SYS_SYSPROTO_H_ 4211 struct getdents_args { 4212 int fd; 4213 char *buf; 4214 size_t count; 4215 }; 4216 #endif 4217 int 4218 sys_getdents(td, uap) 4219 struct thread *td; 4220 register struct getdents_args /* { 4221 int fd; 4222 char *buf; 4223 u_int count; 4224 } */ *uap; 4225 { 4226 struct getdirentries_args ap; 4227 ap.fd = uap->fd; 4228 ap.buf = uap->buf; 4229 ap.count = uap->count; 4230 ap.basep = NULL; 4231 return (sys_getdirentries(td, &ap)); 4232 } 4233 4234 /* 4235 * Set the mode mask for creation of filesystem nodes. 4236 */ 4237 #ifndef _SYS_SYSPROTO_H_ 4238 struct umask_args { 4239 int newmask; 4240 }; 4241 #endif 4242 int 4243 sys_umask(td, uap) 4244 struct thread *td; 4245 struct umask_args /* { 4246 int newmask; 4247 } */ *uap; 4248 { 4249 register struct filedesc *fdp; 4250 4251 FILEDESC_XLOCK(td->td_proc->p_fd); 4252 fdp = td->td_proc->p_fd; 4253 td->td_retval[0] = fdp->fd_cmask; 4254 fdp->fd_cmask = uap->newmask & ALLPERMS; 4255 FILEDESC_XUNLOCK(td->td_proc->p_fd); 4256 return (0); 4257 } 4258 4259 /* 4260 * Void all references to file by ripping underlying filesystem away from 4261 * vnode. 4262 */ 4263 #ifndef _SYS_SYSPROTO_H_ 4264 struct revoke_args { 4265 char *path; 4266 }; 4267 #endif 4268 int 4269 sys_revoke(td, uap) 4270 struct thread *td; 4271 register struct revoke_args /* { 4272 char *path; 4273 } */ *uap; 4274 { 4275 struct vnode *vp; 4276 struct vattr vattr; 4277 int error; 4278 struct nameidata nd; 4279 int vfslocked; 4280 4281 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 4282 UIO_USERSPACE, uap->path, td); 4283 if ((error = namei(&nd)) != 0) 4284 return (error); 4285 vfslocked = NDHASGIANT(&nd); 4286 vp = nd.ni_vp; 4287 NDFREE(&nd, NDF_ONLY_PNBUF); 4288 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4289 error = EINVAL; 4290 goto out; 4291 } 4292 #ifdef MAC 4293 error = mac_vnode_check_revoke(td->td_ucred, vp); 4294 if (error) 4295 goto out; 4296 #endif 4297 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4298 if (error) 4299 goto out; 4300 if (td->td_ucred->cr_uid != vattr.va_uid) { 4301 error = priv_check(td, PRIV_VFS_ADMIN); 4302 if (error) 4303 goto out; 4304 } 4305 if (vcount(vp) > 1) 4306 VOP_REVOKE(vp, REVOKEALL); 4307 out: 4308 vput(vp); 4309 VFS_UNLOCK_GIANT(vfslocked); 4310 return (error); 4311 } 4312 4313 /* 4314 * Convert a user file descriptor to a kernel file entry and check that, if it 4315 * is a capability, the correct rights are present. A reference on the file 4316 * entry is held upon returning. 4317 */ 4318 int 4319 getvnode(struct filedesc *fdp, int fd, cap_rights_t rights, 4320 struct file **fpp) 4321 { 4322 struct file *fp; 4323 #ifdef CAPABILITIES 4324 struct file *fp_fromcap; 4325 #endif 4326 int error; 4327 4328 error = 0; 4329 fp = NULL; 4330 if ((fdp == NULL) || (fp = fget_unlocked(fdp, fd)) == NULL) 4331 return (EBADF); 4332 #ifdef CAPABILITIES 4333 /* 4334 * If the file descriptor is for a capability, test rights and use the 4335 * file descriptor referenced by the capability. 4336 */ 4337 error = cap_funwrap(fp, rights, &fp_fromcap); 4338 if (error) { 4339 fdrop(fp, curthread); 4340 return (error); 4341 } 4342 if (fp != fp_fromcap) { 4343 fhold(fp_fromcap); 4344 fdrop(fp, curthread); 4345 fp = fp_fromcap; 4346 } 4347 #endif /* CAPABILITIES */ 4348 4349 /* 4350 * The file could be not of the vnode type, or it may be not 4351 * yet fully initialized, in which case the f_vnode pointer 4352 * may be set, but f_ops is still badfileops. E.g., 4353 * devfs_open() transiently create such situation to 4354 * facilitate csw d_fdopen(). 4355 * 4356 * Dupfdopen() handling in kern_openat() installs the 4357 * half-baked file into the process descriptor table, allowing 4358 * other thread to dereference it. Guard against the race by 4359 * checking f_ops. 4360 */ 4361 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4362 fdrop(fp, curthread); 4363 return (EINVAL); 4364 } 4365 *fpp = fp; 4366 return (0); 4367 } 4368 4369 4370 /* 4371 * Get an (NFS) file handle. 4372 */ 4373 #ifndef _SYS_SYSPROTO_H_ 4374 struct lgetfh_args { 4375 char *fname; 4376 fhandle_t *fhp; 4377 }; 4378 #endif 4379 int 4380 sys_lgetfh(td, uap) 4381 struct thread *td; 4382 register struct lgetfh_args *uap; 4383 { 4384 struct nameidata nd; 4385 fhandle_t fh; 4386 register struct vnode *vp; 4387 int vfslocked; 4388 int error; 4389 4390 error = priv_check(td, PRIV_VFS_GETFH); 4391 if (error) 4392 return (error); 4393 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 4394 UIO_USERSPACE, uap->fname, td); 4395 error = namei(&nd); 4396 if (error) 4397 return (error); 4398 vfslocked = NDHASGIANT(&nd); 4399 NDFREE(&nd, NDF_ONLY_PNBUF); 4400 vp = nd.ni_vp; 4401 bzero(&fh, sizeof(fh)); 4402 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4403 error = VOP_VPTOFH(vp, &fh.fh_fid); 4404 vput(vp); 4405 VFS_UNLOCK_GIANT(vfslocked); 4406 if (error) 4407 return (error); 4408 error = copyout(&fh, uap->fhp, sizeof (fh)); 4409 return (error); 4410 } 4411 4412 #ifndef _SYS_SYSPROTO_H_ 4413 struct getfh_args { 4414 char *fname; 4415 fhandle_t *fhp; 4416 }; 4417 #endif 4418 int 4419 sys_getfh(td, uap) 4420 struct thread *td; 4421 register struct getfh_args *uap; 4422 { 4423 struct nameidata nd; 4424 fhandle_t fh; 4425 register struct vnode *vp; 4426 int vfslocked; 4427 int error; 4428 4429 error = priv_check(td, PRIV_VFS_GETFH); 4430 if (error) 4431 return (error); 4432 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 4433 UIO_USERSPACE, uap->fname, td); 4434 error = namei(&nd); 4435 if (error) 4436 return (error); 4437 vfslocked = NDHASGIANT(&nd); 4438 NDFREE(&nd, NDF_ONLY_PNBUF); 4439 vp = nd.ni_vp; 4440 bzero(&fh, sizeof(fh)); 4441 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4442 error = VOP_VPTOFH(vp, &fh.fh_fid); 4443 vput(vp); 4444 VFS_UNLOCK_GIANT(vfslocked); 4445 if (error) 4446 return (error); 4447 error = copyout(&fh, uap->fhp, sizeof (fh)); 4448 return (error); 4449 } 4450 4451 /* 4452 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4453 * open descriptor. 4454 * 4455 * warning: do not remove the priv_check() call or this becomes one giant 4456 * security hole. 4457 */ 4458 #ifndef _SYS_SYSPROTO_H_ 4459 struct fhopen_args { 4460 const struct fhandle *u_fhp; 4461 int flags; 4462 }; 4463 #endif 4464 int 4465 sys_fhopen(td, uap) 4466 struct thread *td; 4467 struct fhopen_args /* { 4468 const struct fhandle *u_fhp; 4469 int flags; 4470 } */ *uap; 4471 { 4472 struct proc *p = td->td_proc; 4473 struct mount *mp; 4474 struct vnode *vp; 4475 struct fhandle fhp; 4476 struct vattr vat; 4477 struct vattr *vap = &vat; 4478 struct flock lf; 4479 struct file *fp; 4480 register struct filedesc *fdp = p->p_fd; 4481 int fmode, error, type; 4482 accmode_t accmode; 4483 struct file *nfp; 4484 int vfslocked; 4485 int indx; 4486 4487 error = priv_check(td, PRIV_VFS_FHOPEN); 4488 if (error) 4489 return (error); 4490 fmode = FFLAGS(uap->flags); 4491 /* why not allow a non-read/write open for our lockd? */ 4492 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4493 return (EINVAL); 4494 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4495 if (error) 4496 return(error); 4497 /* find the mount point */ 4498 mp = vfs_busyfs(&fhp.fh_fsid); 4499 if (mp == NULL) 4500 return (ESTALE); 4501 vfslocked = VFS_LOCK_GIANT(mp); 4502 /* now give me my vnode, it gets returned to me locked */ 4503 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4504 vfs_unbusy(mp); 4505 if (error) 4506 goto out; 4507 /* 4508 * from now on we have to make sure not 4509 * to forget about the vnode 4510 * any error that causes an abort must vput(vp) 4511 * just set error = err and 'goto bad;'. 4512 */ 4513 4514 /* 4515 * from vn_open 4516 */ 4517 if (vp->v_type == VLNK) { 4518 error = EMLINK; 4519 goto bad; 4520 } 4521 if (vp->v_type == VSOCK) { 4522 error = EOPNOTSUPP; 4523 goto bad; 4524 } 4525 if (vp->v_type != VDIR && fmode & O_DIRECTORY) { 4526 error = ENOTDIR; 4527 goto bad; 4528 } 4529 accmode = 0; 4530 if (fmode & (FWRITE | O_TRUNC)) { 4531 if (vp->v_type == VDIR) { 4532 error = EISDIR; 4533 goto bad; 4534 } 4535 error = vn_writechk(vp); 4536 if (error) 4537 goto bad; 4538 accmode |= VWRITE; 4539 } 4540 if (fmode & FREAD) 4541 accmode |= VREAD; 4542 if ((fmode & O_APPEND) && (fmode & FWRITE)) 4543 accmode |= VAPPEND; 4544 #ifdef MAC 4545 error = mac_vnode_check_open(td->td_ucred, vp, accmode); 4546 if (error) 4547 goto bad; 4548 #endif 4549 if (accmode) { 4550 error = VOP_ACCESS(vp, accmode, td->td_ucred, td); 4551 if (error) 4552 goto bad; 4553 } 4554 if (fmode & O_TRUNC) { 4555 vfs_ref(mp); 4556 VOP_UNLOCK(vp, 0); /* XXX */ 4557 if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) { 4558 vrele(vp); 4559 vfs_rel(mp); 4560 goto out; 4561 } 4562 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 4563 vfs_rel(mp); 4564 #ifdef MAC 4565 /* 4566 * We don't yet have fp->f_cred, so use td->td_ucred, which 4567 * should be right. 4568 */ 4569 error = mac_vnode_check_write(td->td_ucred, td->td_ucred, vp); 4570 if (error == 0) { 4571 #endif 4572 VATTR_NULL(vap); 4573 vap->va_size = 0; 4574 error = VOP_SETATTR(vp, vap, td->td_ucred); 4575 #ifdef MAC 4576 } 4577 #endif 4578 vn_finished_write(mp); 4579 if (error) 4580 goto bad; 4581 } 4582 error = VOP_OPEN(vp, fmode, td->td_ucred, td, NULL); 4583 if (error) 4584 goto bad; 4585 4586 if (fmode & FWRITE) 4587 vp->v_writecount++; 4588 4589 /* 4590 * end of vn_open code 4591 */ 4592 4593 if ((error = falloc(td, &nfp, &indx, fmode)) != 0) { 4594 if (fmode & FWRITE) 4595 vp->v_writecount--; 4596 goto bad; 4597 } 4598 /* An extra reference on `nfp' has been held for us by falloc(). */ 4599 fp = nfp; 4600 nfp->f_vnode = vp; 4601 finit(nfp, fmode & FMASK, DTYPE_VNODE, vp, &vnops); 4602 if (fmode & (O_EXLOCK | O_SHLOCK)) { 4603 lf.l_whence = SEEK_SET; 4604 lf.l_start = 0; 4605 lf.l_len = 0; 4606 if (fmode & O_EXLOCK) 4607 lf.l_type = F_WRLCK; 4608 else 4609 lf.l_type = F_RDLCK; 4610 type = F_FLOCK; 4611 if ((fmode & FNONBLOCK) == 0) 4612 type |= F_WAIT; 4613 VOP_UNLOCK(vp, 0); 4614 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, 4615 type)) != 0) { 4616 /* 4617 * The lock request failed. Normally close the 4618 * descriptor but handle the case where someone might 4619 * have dup()d or close()d it when we weren't looking. 4620 */ 4621 fdclose(fdp, fp, indx, td); 4622 4623 /* 4624 * release our private reference 4625 */ 4626 fdrop(fp, td); 4627 goto out; 4628 } 4629 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4630 atomic_set_int(&fp->f_flag, FHASLOCK); 4631 } 4632 4633 VOP_UNLOCK(vp, 0); 4634 fdrop(fp, td); 4635 VFS_UNLOCK_GIANT(vfslocked); 4636 td->td_retval[0] = indx; 4637 return (0); 4638 4639 bad: 4640 vput(vp); 4641 out: 4642 VFS_UNLOCK_GIANT(vfslocked); 4643 return (error); 4644 } 4645 4646 /* 4647 * Stat an (NFS) file handle. 4648 */ 4649 #ifndef _SYS_SYSPROTO_H_ 4650 struct fhstat_args { 4651 struct fhandle *u_fhp; 4652 struct stat *sb; 4653 }; 4654 #endif 4655 int 4656 sys_fhstat(td, uap) 4657 struct thread *td; 4658 register struct fhstat_args /* { 4659 struct fhandle *u_fhp; 4660 struct stat *sb; 4661 } */ *uap; 4662 { 4663 struct stat sb; 4664 fhandle_t fh; 4665 struct mount *mp; 4666 struct vnode *vp; 4667 int vfslocked; 4668 int error; 4669 4670 error = priv_check(td, PRIV_VFS_FHSTAT); 4671 if (error) 4672 return (error); 4673 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4674 if (error) 4675 return (error); 4676 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4677 return (ESTALE); 4678 vfslocked = VFS_LOCK_GIANT(mp); 4679 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4680 vfs_unbusy(mp); 4681 if (error) { 4682 VFS_UNLOCK_GIANT(vfslocked); 4683 return (error); 4684 } 4685 error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td); 4686 vput(vp); 4687 VFS_UNLOCK_GIANT(vfslocked); 4688 if (error) 4689 return (error); 4690 error = copyout(&sb, uap->sb, sizeof(sb)); 4691 return (error); 4692 } 4693 4694 /* 4695 * Implement fstatfs() for (NFS) file handles. 4696 */ 4697 #ifndef _SYS_SYSPROTO_H_ 4698 struct fhstatfs_args { 4699 struct fhandle *u_fhp; 4700 struct statfs *buf; 4701 }; 4702 #endif 4703 int 4704 sys_fhstatfs(td, uap) 4705 struct thread *td; 4706 struct fhstatfs_args /* { 4707 struct fhandle *u_fhp; 4708 struct statfs *buf; 4709 } */ *uap; 4710 { 4711 struct statfs sf; 4712 fhandle_t fh; 4713 int error; 4714 4715 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4716 if (error) 4717 return (error); 4718 error = kern_fhstatfs(td, fh, &sf); 4719 if (error) 4720 return (error); 4721 return (copyout(&sf, uap->buf, sizeof(sf))); 4722 } 4723 4724 int 4725 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4726 { 4727 struct statfs *sp; 4728 struct mount *mp; 4729 struct vnode *vp; 4730 int vfslocked; 4731 int error; 4732 4733 error = priv_check(td, PRIV_VFS_FHSTATFS); 4734 if (error) 4735 return (error); 4736 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4737 return (ESTALE); 4738 vfslocked = VFS_LOCK_GIANT(mp); 4739 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4740 if (error) { 4741 vfs_unbusy(mp); 4742 VFS_UNLOCK_GIANT(vfslocked); 4743 return (error); 4744 } 4745 vput(vp); 4746 error = prison_canseemount(td->td_ucred, mp); 4747 if (error) 4748 goto out; 4749 #ifdef MAC 4750 error = mac_mount_check_stat(td->td_ucred, mp); 4751 if (error) 4752 goto out; 4753 #endif 4754 /* 4755 * Set these in case the underlying filesystem fails to do so. 4756 */ 4757 sp = &mp->mnt_stat; 4758 sp->f_version = STATFS_VERSION; 4759 sp->f_namemax = NAME_MAX; 4760 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 4761 error = VFS_STATFS(mp, sp); 4762 if (error == 0) 4763 *buf = *sp; 4764 out: 4765 vfs_unbusy(mp); 4766 VFS_UNLOCK_GIANT(vfslocked); 4767 return (error); 4768 } 4769 4770 int 4771 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len) 4772 { 4773 struct file *fp; 4774 struct mount *mp; 4775 struct vnode *vp; 4776 off_t olen, ooffset; 4777 int error, vfslocked; 4778 4779 fp = NULL; 4780 vfslocked = 0; 4781 error = fget(td, fd, CAP_WRITE, &fp); 4782 if (error != 0) 4783 goto out; 4784 4785 switch (fp->f_type) { 4786 case DTYPE_VNODE: 4787 break; 4788 case DTYPE_PIPE: 4789 case DTYPE_FIFO: 4790 error = ESPIPE; 4791 goto out; 4792 default: 4793 error = ENODEV; 4794 goto out; 4795 } 4796 if ((fp->f_flag & FWRITE) == 0) { 4797 error = EBADF; 4798 goto out; 4799 } 4800 vp = fp->f_vnode; 4801 if (vp->v_type != VREG) { 4802 error = ENODEV; 4803 goto out; 4804 } 4805 if (offset < 0 || len <= 0) { 4806 error = EINVAL; 4807 goto out; 4808 } 4809 /* Check for wrap. */ 4810 if (offset > OFF_MAX - len) { 4811 error = EFBIG; 4812 goto out; 4813 } 4814 4815 /* Allocating blocks may take a long time, so iterate. */ 4816 for (;;) { 4817 olen = len; 4818 ooffset = offset; 4819 4820 bwillwrite(); 4821 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 4822 mp = NULL; 4823 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 4824 if (error != 0) { 4825 VFS_UNLOCK_GIANT(vfslocked); 4826 break; 4827 } 4828 error = vn_lock(vp, LK_EXCLUSIVE); 4829 if (error != 0) { 4830 vn_finished_write(mp); 4831 VFS_UNLOCK_GIANT(vfslocked); 4832 break; 4833 } 4834 #ifdef MAC 4835 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp); 4836 if (error == 0) 4837 #endif 4838 error = VOP_ALLOCATE(vp, &offset, &len); 4839 VOP_UNLOCK(vp, 0); 4840 vn_finished_write(mp); 4841 VFS_UNLOCK_GIANT(vfslocked); 4842 4843 if (olen + ooffset != offset + len) { 4844 panic("offset + len changed from %jx/%jx to %jx/%jx", 4845 ooffset, olen, offset, len); 4846 } 4847 if (error != 0 || len == 0) 4848 break; 4849 KASSERT(olen > len, ("Iteration did not make progress?")); 4850 maybe_yield(); 4851 } 4852 out: 4853 if (fp != NULL) 4854 fdrop(fp, td); 4855 return (error); 4856 } 4857 4858 int 4859 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap) 4860 { 4861 4862 return (kern_posix_fallocate(td, uap->fd, uap->offset, uap->len)); 4863 } 4864 4865 /* 4866 * Unlike madvise(2), we do not make a best effort to remember every 4867 * possible caching hint. Instead, we remember the last setting with 4868 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4869 * region of any current setting. 4870 */ 4871 int 4872 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4873 int advice) 4874 { 4875 struct fadvise_info *fa, *new; 4876 struct file *fp; 4877 struct vnode *vp; 4878 off_t end; 4879 int error; 4880 4881 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4882 return (EINVAL); 4883 switch (advice) { 4884 case POSIX_FADV_SEQUENTIAL: 4885 case POSIX_FADV_RANDOM: 4886 case POSIX_FADV_NOREUSE: 4887 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4888 break; 4889 case POSIX_FADV_NORMAL: 4890 case POSIX_FADV_WILLNEED: 4891 case POSIX_FADV_DONTNEED: 4892 new = NULL; 4893 break; 4894 default: 4895 return (EINVAL); 4896 } 4897 /* XXX: CAP_POSIX_FADVISE? */ 4898 error = fget(td, fd, 0, &fp); 4899 if (error != 0) 4900 goto out; 4901 4902 switch (fp->f_type) { 4903 case DTYPE_VNODE: 4904 break; 4905 case DTYPE_PIPE: 4906 case DTYPE_FIFO: 4907 error = ESPIPE; 4908 goto out; 4909 default: 4910 error = ENODEV; 4911 goto out; 4912 } 4913 vp = fp->f_vnode; 4914 if (vp->v_type != VREG) { 4915 error = ENODEV; 4916 goto out; 4917 } 4918 if (len == 0) 4919 end = OFF_MAX; 4920 else 4921 end = offset + len - 1; 4922 switch (advice) { 4923 case POSIX_FADV_SEQUENTIAL: 4924 case POSIX_FADV_RANDOM: 4925 case POSIX_FADV_NOREUSE: 4926 /* 4927 * Try to merge any existing non-standard region with 4928 * this new region if possible, otherwise create a new 4929 * non-standard region for this request. 4930 */ 4931 mtx_pool_lock(mtxpool_sleep, fp); 4932 fa = fp->f_advice; 4933 if (fa != NULL && fa->fa_advice == advice && 4934 ((fa->fa_start <= end && fa->fa_end >= offset) || 4935 (end != OFF_MAX && fa->fa_start == end + 1) || 4936 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4937 if (offset < fa->fa_start) 4938 fa->fa_start = offset; 4939 if (end > fa->fa_end) 4940 fa->fa_end = end; 4941 } else { 4942 new->fa_advice = advice; 4943 new->fa_start = offset; 4944 new->fa_end = end; 4945 fp->f_advice = new; 4946 new = fa; 4947 } 4948 mtx_pool_unlock(mtxpool_sleep, fp); 4949 break; 4950 case POSIX_FADV_NORMAL: 4951 /* 4952 * If a the "normal" region overlaps with an existing 4953 * non-standard region, trim or remove the 4954 * non-standard region. 4955 */ 4956 mtx_pool_lock(mtxpool_sleep, fp); 4957 fa = fp->f_advice; 4958 if (fa != NULL) { 4959 if (offset <= fa->fa_start && end >= fa->fa_end) { 4960 new = fa; 4961 fp->f_advice = NULL; 4962 } else if (offset <= fa->fa_start && 4963 end >= fa->fa_start) 4964 fa->fa_start = end + 1; 4965 else if (offset <= fa->fa_end && end >= fa->fa_end) 4966 fa->fa_end = offset - 1; 4967 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4968 /* 4969 * If the "normal" region is a middle 4970 * portion of the existing 4971 * non-standard region, just remove 4972 * the whole thing rather than picking 4973 * one side or the other to 4974 * preserve. 4975 */ 4976 new = fa; 4977 fp->f_advice = NULL; 4978 } 4979 } 4980 mtx_pool_unlock(mtxpool_sleep, fp); 4981 break; 4982 case POSIX_FADV_WILLNEED: 4983 case POSIX_FADV_DONTNEED: 4984 error = VOP_ADVISE(vp, offset, end, advice); 4985 break; 4986 } 4987 out: 4988 if (fp != NULL) 4989 fdrop(fp, td); 4990 free(new, M_FADVISE); 4991 return (error); 4992 } 4993 4994 int 4995 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4996 { 4997 4998 return (kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4999 uap->advice)); 5000 } 5001