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