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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 39 * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $ 40 * $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.135 2008/11/11 00:55:49 pavalos Exp $ 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/buf.h> 46 #include <sys/conf.h> 47 #include <sys/sysent.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mountctl.h> 51 #include <sys/sysproto.h> 52 #include <sys/filedesc.h> 53 #include <sys/kernel.h> 54 #include <sys/fcntl.h> 55 #include <sys/file.h> 56 #include <sys/linker.h> 57 #include <sys/stat.h> 58 #include <sys/unistd.h> 59 #include <sys/vnode.h> 60 #include <sys/proc.h> 61 #include <sys/priv.h> 62 #include <sys/jail.h> 63 #include <sys/namei.h> 64 #include <sys/nlookup.h> 65 #include <sys/dirent.h> 66 #include <sys/extattr.h> 67 #include <sys/spinlock.h> 68 #include <sys/kern_syscall.h> 69 #include <sys/objcache.h> 70 #include <sys/sysctl.h> 71 72 #include <sys/buf2.h> 73 #include <sys/file2.h> 74 #include <sys/spinlock2.h> 75 76 #include <vm/vm.h> 77 #include <vm/vm_object.h> 78 #include <vm/vm_page.h> 79 80 #include <machine/limits.h> 81 #include <machine/stdarg.h> 82 83 #include <vfs/union/union.h> 84 85 static void mount_warning(struct mount *mp, const char *ctl, ...); 86 static int mount_path(struct proc *p, struct mount *mp, char **rb, char **fb); 87 static int checkvp_chdir (struct vnode *vn, struct thread *td); 88 static void checkdirs (struct nchandle *old_nch, struct nchandle *new_nch); 89 static int chroot_refuse_vdir_fds (struct filedesc *fdp); 90 static int chroot_visible_mnt(struct mount *mp, struct proc *p); 91 static int getutimes (const struct timeval *, struct timespec *); 92 static int setfown (struct vnode *, uid_t, gid_t); 93 static int setfmode (struct vnode *, int); 94 static int setfflags (struct vnode *, int); 95 static int setutimes (struct vnode *, struct vattr *, 96 const struct timespec *, int); 97 static int usermount = 0; /* if 1, non-root can mount fs. */ 98 99 int (*union_dircheckp) (struct thread *, struct vnode **, struct file *); 100 101 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, ""); 102 103 /* 104 * Virtual File System System Calls 105 */ 106 107 /* 108 * Mount a file system. 109 */ 110 /* 111 * mount_args(char *type, char *path, int flags, caddr_t data) 112 */ 113 /* ARGSUSED */ 114 int 115 sys_mount(struct mount_args *uap) 116 { 117 struct thread *td = curthread; 118 struct proc *p = td->td_proc; 119 struct vnode *vp; 120 struct nchandle nch; 121 struct mount *mp; 122 struct vfsconf *vfsp; 123 int error, flag = 0, flag2 = 0; 124 int hasmount; 125 struct vattr va; 126 struct nlookupdata nd; 127 char fstypename[MFSNAMELEN]; 128 struct ucred *cred = p->p_ucred; 129 130 KKASSERT(p); 131 if (jailed(cred)) 132 return (EPERM); 133 if (usermount == 0 && (error = priv_check(td, PRIV_ROOT))) 134 return (error); 135 /* 136 * Do not allow NFS export by non-root users. 137 */ 138 if (uap->flags & MNT_EXPORTED) { 139 error = priv_check(td, PRIV_ROOT); 140 if (error) 141 return (error); 142 } 143 /* 144 * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users 145 */ 146 if (priv_check(td, PRIV_ROOT)) 147 uap->flags |= MNT_NOSUID | MNT_NODEV; 148 149 /* 150 * Lookup the requested path and extract the nch and vnode. 151 */ 152 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 153 if (error == 0) { 154 if ((error = nlookup(&nd)) == 0) { 155 if (nd.nl_nch.ncp->nc_vp == NULL) 156 error = ENOENT; 157 } 158 } 159 if (error) { 160 nlookup_done(&nd); 161 return (error); 162 } 163 164 /* 165 * Extract the locked+refd ncp and cleanup the nd structure 166 */ 167 nch = nd.nl_nch; 168 cache_zero(&nd.nl_nch); 169 nlookup_done(&nd); 170 171 if ((nch.ncp->nc_flag & NCF_ISMOUNTPT) && cache_findmount(&nch)) 172 hasmount = 1; 173 else 174 hasmount = 0; 175 176 177 /* 178 * now we have the locked ref'd nch and unreferenced vnode. 179 */ 180 vp = nch.ncp->nc_vp; 181 if ((error = vget(vp, LK_EXCLUSIVE)) != 0) { 182 cache_put(&nch); 183 return (error); 184 } 185 cache_unlock(&nch); 186 187 /* 188 * Now we have an unlocked ref'd nch and a locked ref'd vp 189 */ 190 if (uap->flags & MNT_UPDATE) { 191 if ((vp->v_flag & (VROOT|VPFSROOT)) == 0) { 192 cache_drop(&nch); 193 vput(vp); 194 return (EINVAL); 195 } 196 mp = vp->v_mount; 197 flag = mp->mnt_flag; 198 flag2 = mp->mnt_kern_flag; 199 /* 200 * We only allow the filesystem to be reloaded if it 201 * is currently mounted read-only. 202 */ 203 if ((uap->flags & MNT_RELOAD) && 204 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 205 cache_drop(&nch); 206 vput(vp); 207 return (EOPNOTSUPP); /* Needs translation */ 208 } 209 /* 210 * Only root, or the user that did the original mount is 211 * permitted to update it. 212 */ 213 if (mp->mnt_stat.f_owner != cred->cr_uid && 214 (error = priv_check(td, PRIV_ROOT))) { 215 cache_drop(&nch); 216 vput(vp); 217 return (error); 218 } 219 if (vfs_busy(mp, LK_NOWAIT)) { 220 cache_drop(&nch); 221 vput(vp); 222 return (EBUSY); 223 } 224 if ((vp->v_flag & VMOUNT) != 0 || hasmount) { 225 cache_drop(&nch); 226 vfs_unbusy(mp); 227 vput(vp); 228 return (EBUSY); 229 } 230 vp->v_flag |= VMOUNT; 231 mp->mnt_flag |= 232 uap->flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 233 vn_unlock(vp); 234 goto update; 235 } 236 /* 237 * If the user is not root, ensure that they own the directory 238 * onto which we are attempting to mount. 239 */ 240 if ((error = VOP_GETATTR(vp, &va)) || 241 (va.va_uid != cred->cr_uid && (error = priv_check(td, PRIV_ROOT)))) { 242 cache_drop(&nch); 243 vput(vp); 244 return (error); 245 } 246 if ((error = vinvalbuf(vp, V_SAVE, 0, 0)) != 0) { 247 cache_drop(&nch); 248 vput(vp); 249 return (error); 250 } 251 if (vp->v_type != VDIR) { 252 cache_drop(&nch); 253 vput(vp); 254 return (ENOTDIR); 255 } 256 if (vp->v_mount->mnt_kern_flag & MNTK_NOSTKMNT) { 257 cache_drop(&nch); 258 vput(vp); 259 return (EPERM); 260 } 261 if ((error = copyinstr(uap->type, fstypename, MFSNAMELEN, NULL)) != 0) { 262 cache_drop(&nch); 263 vput(vp); 264 return (error); 265 } 266 vfsp = vfsconf_find_by_name(fstypename); 267 if (vfsp == NULL) { 268 linker_file_t lf; 269 270 /* Only load modules for root (very important!) */ 271 if ((error = priv_check(td, PRIV_ROOT)) != 0) { 272 cache_drop(&nch); 273 vput(vp); 274 return error; 275 } 276 error = linker_load_file(fstypename, &lf, 0); 277 if (error || lf == NULL) { 278 cache_drop(&nch); 279 vput(vp); 280 if (lf == NULL) 281 error = ENODEV; 282 return error; 283 } 284 lf->userrefs++; 285 /* lookup again, see if the VFS was loaded */ 286 vfsp = vfsconf_find_by_name(fstypename); 287 if (vfsp == NULL) { 288 lf->userrefs--; 289 linker_file_unload(lf); 290 cache_drop(&nch); 291 vput(vp); 292 return (ENODEV); 293 } 294 } 295 if ((vp->v_flag & VMOUNT) != 0 || hasmount) { 296 cache_drop(&nch); 297 vput(vp); 298 return (EBUSY); 299 } 300 vp->v_flag |= VMOUNT; 301 302 /* 303 * Allocate and initialize the filesystem. 304 */ 305 mp = kmalloc(sizeof(struct mount), M_MOUNT, M_ZERO|M_WAITOK); 306 TAILQ_INIT(&mp->mnt_nvnodelist); 307 TAILQ_INIT(&mp->mnt_reservedvnlist); 308 TAILQ_INIT(&mp->mnt_jlist); 309 mp->mnt_nvnodelistsize = 0; 310 lockinit(&mp->mnt_lock, "vfslock", 0, 0); 311 vfs_busy(mp, LK_NOWAIT); 312 mp->mnt_op = vfsp->vfc_vfsops; 313 mp->mnt_vfc = vfsp; 314 vfsp->vfc_refcount++; 315 mp->mnt_stat.f_type = vfsp->vfc_typenum; 316 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 317 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 318 mp->mnt_stat.f_owner = cred->cr_uid; 319 mp->mnt_iosize_max = DFLTPHYS; 320 vn_unlock(vp); 321 update: 322 /* 323 * Set the mount level flags. 324 */ 325 if (uap->flags & MNT_RDONLY) 326 mp->mnt_flag |= MNT_RDONLY; 327 else if (mp->mnt_flag & MNT_RDONLY) 328 mp->mnt_kern_flag |= MNTK_WANTRDWR; 329 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 330 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME | 331 MNT_NOSYMFOLLOW | MNT_IGNORE | 332 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); 333 mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC | 334 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE | 335 MNT_NOSYMFOLLOW | MNT_IGNORE | 336 MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); 337 /* 338 * Mount the filesystem. 339 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 340 * get. 341 */ 342 error = VFS_MOUNT(mp, uap->path, uap->data, cred); 343 if (mp->mnt_flag & MNT_UPDATE) { 344 if (mp->mnt_kern_flag & MNTK_WANTRDWR) 345 mp->mnt_flag &= ~MNT_RDONLY; 346 mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE); 347 mp->mnt_kern_flag &=~ MNTK_WANTRDWR; 348 if (error) { 349 mp->mnt_flag = flag; 350 mp->mnt_kern_flag = flag2; 351 } 352 vfs_unbusy(mp); 353 vp->v_flag &= ~VMOUNT; 354 vrele(vp); 355 cache_drop(&nch); 356 return (error); 357 } 358 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 359 /* 360 * Put the new filesystem on the mount list after root. The mount 361 * point gets its own mnt_ncmountpt (unless the VFS already set one 362 * up) which represents the root of the mount. The lookup code 363 * detects the mount point going forward and checks the root of 364 * the mount going backwards. 365 * 366 * It is not necessary to invalidate or purge the vnode underneath 367 * because elements under the mount will be given their own glue 368 * namecache record. 369 */ 370 if (!error) { 371 if (mp->mnt_ncmountpt.ncp == NULL) { 372 /* 373 * allocate, then unlock, but leave the ref intact 374 */ 375 cache_allocroot(&mp->mnt_ncmountpt, mp, NULL); 376 cache_unlock(&mp->mnt_ncmountpt); 377 } 378 mp->mnt_ncmounton = nch; /* inherits ref */ 379 nch.ncp->nc_flag |= NCF_ISMOUNTPT; 380 381 /* XXX get the root of the fs and cache_setvp(mnt_ncmountpt...) */ 382 vp->v_flag &= ~VMOUNT; 383 mountlist_insert(mp, MNTINS_LAST); 384 vn_unlock(vp); 385 checkdirs(&mp->mnt_ncmounton, &mp->mnt_ncmountpt); 386 error = vfs_allocate_syncvnode(mp); 387 vfs_unbusy(mp); 388 error = VFS_START(mp, 0); 389 vrele(vp); 390 } else { 391 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops); 392 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops); 393 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops); 394 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops); 395 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops); 396 vp->v_flag &= ~VMOUNT; 397 mp->mnt_vfc->vfc_refcount--; 398 vfs_unbusy(mp); 399 kfree(mp, M_MOUNT); 400 cache_drop(&nch); 401 vput(vp); 402 } 403 return (error); 404 } 405 406 /* 407 * Scan all active processes to see if any of them have a current 408 * or root directory onto which the new filesystem has just been 409 * mounted. If so, replace them with the new mount point. 410 * 411 * The passed ncp is ref'd and locked (from the mount code) and 412 * must be associated with the vnode representing the root of the 413 * mount point. 414 */ 415 struct checkdirs_info { 416 struct nchandle old_nch; 417 struct nchandle new_nch; 418 struct vnode *old_vp; 419 struct vnode *new_vp; 420 }; 421 422 static int checkdirs_callback(struct proc *p, void *data); 423 424 static void 425 checkdirs(struct nchandle *old_nch, struct nchandle *new_nch) 426 { 427 struct checkdirs_info info; 428 struct vnode *olddp; 429 struct vnode *newdp; 430 struct mount *mp; 431 432 /* 433 * If the old mount point's vnode has a usecount of 1, it is not 434 * being held as a descriptor anywhere. 435 */ 436 olddp = old_nch->ncp->nc_vp; 437 if (olddp == NULL || olddp->v_sysref.refcnt == 1) 438 return; 439 440 /* 441 * Force the root vnode of the new mount point to be resolved 442 * so we can update any matching processes. 443 */ 444 mp = new_nch->mount; 445 if (VFS_ROOT(mp, &newdp)) 446 panic("mount: lost mount"); 447 cache_setunresolved(new_nch); 448 cache_setvp(new_nch, newdp); 449 450 /* 451 * Special handling of the root node 452 */ 453 if (rootvnode == olddp) { 454 vref(newdp); 455 vfs_cache_setroot(newdp, cache_hold(new_nch)); 456 } 457 458 /* 459 * Pass newdp separately so the callback does not have to access 460 * it via new_nch->ncp->nc_vp. 461 */ 462 info.old_nch = *old_nch; 463 info.new_nch = *new_nch; 464 info.new_vp = newdp; 465 allproc_scan(checkdirs_callback, &info); 466 vput(newdp); 467 } 468 469 /* 470 * NOTE: callback is not MP safe because the scanned process's filedesc 471 * structure can be ripped out from under us, amoung other things. 472 */ 473 static int 474 checkdirs_callback(struct proc *p, void *data) 475 { 476 struct checkdirs_info *info = data; 477 struct filedesc *fdp; 478 struct nchandle ncdrop1; 479 struct nchandle ncdrop2; 480 struct vnode *vprele1; 481 struct vnode *vprele2; 482 483 if ((fdp = p->p_fd) != NULL) { 484 cache_zero(&ncdrop1); 485 cache_zero(&ncdrop2); 486 vprele1 = NULL; 487 vprele2 = NULL; 488 489 /* 490 * MPUNSAFE - XXX fdp can be pulled out from under a 491 * foreign process. 492 * 493 * A shared filedesc is ok, we don't have to copy it 494 * because we are making this change globally. 495 */ 496 spin_lock_wr(&fdp->fd_spin); 497 if (fdp->fd_ncdir.mount == info->old_nch.mount && 498 fdp->fd_ncdir.ncp == info->old_nch.ncp) { 499 vprele1 = fdp->fd_cdir; 500 vref(info->new_vp); 501 fdp->fd_cdir = info->new_vp; 502 ncdrop1 = fdp->fd_ncdir; 503 cache_copy(&info->new_nch, &fdp->fd_ncdir); 504 } 505 if (fdp->fd_nrdir.mount == info->old_nch.mount && 506 fdp->fd_nrdir.ncp == info->old_nch.ncp) { 507 vprele2 = fdp->fd_rdir; 508 vref(info->new_vp); 509 fdp->fd_rdir = info->new_vp; 510 ncdrop2 = fdp->fd_nrdir; 511 cache_copy(&info->new_nch, &fdp->fd_nrdir); 512 } 513 spin_unlock_wr(&fdp->fd_spin); 514 if (ncdrop1.ncp) 515 cache_drop(&ncdrop1); 516 if (ncdrop2.ncp) 517 cache_drop(&ncdrop2); 518 if (vprele1) 519 vrele(vprele1); 520 if (vprele2) 521 vrele(vprele2); 522 } 523 return(0); 524 } 525 526 /* 527 * Unmount a file system. 528 * 529 * Note: unmount takes a path to the vnode mounted on as argument, 530 * not special file (as before). 531 */ 532 /* 533 * umount_args(char *path, int flags) 534 */ 535 /* ARGSUSED */ 536 int 537 sys_unmount(struct unmount_args *uap) 538 { 539 struct thread *td = curthread; 540 struct proc *p = td->td_proc; 541 struct mount *mp = NULL; 542 int error; 543 struct nlookupdata nd; 544 545 KKASSERT(p); 546 if (p->p_ucred->cr_prison != NULL) 547 return (EPERM); 548 if (usermount == 0 && (error = priv_check(td, PRIV_ROOT))) 549 return (error); 550 551 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 552 if (error == 0) 553 error = nlookup(&nd); 554 if (error) 555 goto out; 556 557 mp = nd.nl_nch.mount; 558 559 /* 560 * Only root, or the user that did the original mount is 561 * permitted to unmount this filesystem. 562 */ 563 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 564 (error = priv_check(td, PRIV_ROOT))) 565 goto out; 566 567 /* 568 * Don't allow unmounting the root file system. 569 */ 570 if (mp->mnt_flag & MNT_ROOTFS) { 571 error = EINVAL; 572 goto out; 573 } 574 575 /* 576 * Must be the root of the filesystem 577 */ 578 if (nd.nl_nch.ncp != mp->mnt_ncmountpt.ncp) { 579 error = EINVAL; 580 goto out; 581 } 582 583 out: 584 nlookup_done(&nd); 585 if (error) 586 return (error); 587 return (dounmount(mp, uap->flags)); 588 } 589 590 /* 591 * Do the actual file system unmount. 592 */ 593 static int 594 dounmount_interlock(struct mount *mp) 595 { 596 if (mp->mnt_kern_flag & MNTK_UNMOUNT) 597 return (EBUSY); 598 mp->mnt_kern_flag |= MNTK_UNMOUNT; 599 return(0); 600 } 601 602 int 603 dounmount(struct mount *mp, int flags) 604 { 605 struct namecache *ncp; 606 struct nchandle nch; 607 struct vnode *vp; 608 int error; 609 int async_flag; 610 int lflags; 611 int freeok = 1; 612 613 /* 614 * Exclusive access for unmounting purposes 615 */ 616 if ((error = mountlist_interlock(dounmount_interlock, mp)) != 0) 617 return (error); 618 619 /* 620 * Allow filesystems to detect that a forced unmount is in progress. 621 */ 622 if (flags & MNT_FORCE) 623 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 624 lflags = LK_EXCLUSIVE | ((flags & MNT_FORCE) ? 0 : LK_NOWAIT); 625 error = lockmgr(&mp->mnt_lock, lflags); 626 if (error) { 627 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 628 if (mp->mnt_kern_flag & MNTK_MWAIT) 629 wakeup(mp); 630 return (error); 631 } 632 633 if (mp->mnt_flag & MNT_EXPUBLIC) 634 vfs_setpublicfs(NULL, NULL, NULL); 635 636 vfs_msync(mp, MNT_WAIT); 637 async_flag = mp->mnt_flag & MNT_ASYNC; 638 mp->mnt_flag &=~ MNT_ASYNC; 639 640 /* 641 * If this filesystem isn't aliasing other filesystems, 642 * try to invalidate any remaining namecache entries and 643 * check the count afterwords. 644 */ 645 if ((mp->mnt_kern_flag & MNTK_NCALIASED) == 0) { 646 cache_lock(&mp->mnt_ncmountpt); 647 cache_inval(&mp->mnt_ncmountpt, CINV_DESTROY|CINV_CHILDREN); 648 cache_unlock(&mp->mnt_ncmountpt); 649 650 if ((ncp = mp->mnt_ncmountpt.ncp) != NULL && 651 (ncp->nc_refs != 1 || TAILQ_FIRST(&ncp->nc_list))) { 652 653 if ((flags & MNT_FORCE) == 0) { 654 error = EBUSY; 655 mount_warning(mp, "Cannot unmount: " 656 "%d namecache " 657 "references still " 658 "present", 659 ncp->nc_refs - 1); 660 } else { 661 mount_warning(mp, "Forced unmount: " 662 "%d namecache " 663 "references still " 664 "present", 665 ncp->nc_refs - 1); 666 freeok = 0; 667 } 668 } 669 } 670 671 /* 672 * nchandle records ref the mount structure. Expect a count of 1 673 * (our mount->mnt_ncmountpt). 674 */ 675 if (mp->mnt_refs != 1) { 676 if ((flags & MNT_FORCE) == 0) { 677 mount_warning(mp, "Cannot unmount: " 678 "%d process references still " 679 "present", mp->mnt_refs); 680 error = EBUSY; 681 } else { 682 mount_warning(mp, "Forced unmount: " 683 "%d process references still " 684 "present", mp->mnt_refs); 685 freeok = 0; 686 } 687 } 688 689 /* 690 * Decomission our special mnt_syncer vnode. This also stops 691 * the vnlru code. If we are unable to unmount we recommission 692 * the vnode. 693 */ 694 if (error == 0) { 695 if ((vp = mp->mnt_syncer) != NULL) { 696 mp->mnt_syncer = NULL; 697 vrele(vp); 698 } 699 if (((mp->mnt_flag & MNT_RDONLY) || 700 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || 701 (flags & MNT_FORCE)) { 702 error = VFS_UNMOUNT(mp, flags); 703 } 704 } 705 if (error) { 706 if (mp->mnt_syncer == NULL) 707 vfs_allocate_syncvnode(mp); 708 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 709 mp->mnt_flag |= async_flag; 710 lockmgr(&mp->mnt_lock, LK_RELEASE); 711 if (mp->mnt_kern_flag & MNTK_MWAIT) 712 wakeup(mp); 713 return (error); 714 } 715 /* 716 * Clean up any journals still associated with the mount after 717 * filesystem activity has ceased. 718 */ 719 journal_remove_all_journals(mp, 720 ((flags & MNT_FORCE) ? MC_JOURNAL_STOP_IMM : 0)); 721 722 mountlist_remove(mp); 723 724 /* 725 * Remove any installed vnode ops here so the individual VFSs don't 726 * have to. 727 */ 728 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops); 729 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops); 730 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops); 731 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops); 732 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops); 733 734 if (mp->mnt_ncmountpt.ncp != NULL) { 735 nch = mp->mnt_ncmountpt; 736 cache_zero(&mp->mnt_ncmountpt); 737 cache_clrmountpt(&nch); 738 cache_drop(&nch); 739 } 740 if (mp->mnt_ncmounton.ncp != NULL) { 741 nch = mp->mnt_ncmounton; 742 cache_zero(&mp->mnt_ncmounton); 743 cache_clrmountpt(&nch); 744 cache_drop(&nch); 745 } 746 747 mp->mnt_vfc->vfc_refcount--; 748 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) 749 panic("unmount: dangling vnode"); 750 lockmgr(&mp->mnt_lock, LK_RELEASE); 751 if (mp->mnt_kern_flag & MNTK_MWAIT) 752 wakeup(mp); 753 if (freeok) 754 kfree(mp, M_MOUNT); 755 return (0); 756 } 757 758 static 759 void 760 mount_warning(struct mount *mp, const char *ctl, ...) 761 { 762 char *ptr; 763 char *buf; 764 __va_list va; 765 766 __va_start(va, ctl); 767 if (cache_fullpath(NULL, &mp->mnt_ncmounton, &ptr, &buf) == 0) { 768 kprintf("unmount(%s): ", ptr); 769 kvprintf(ctl, va); 770 kprintf("\n"); 771 kfree(buf, M_TEMP); 772 } else { 773 kprintf("unmount(%p", mp); 774 if (mp->mnt_ncmounton.ncp && mp->mnt_ncmounton.ncp->nc_name) 775 kprintf(",%s", mp->mnt_ncmounton.ncp->nc_name); 776 kprintf("): "); 777 kvprintf(ctl, va); 778 kprintf("\n"); 779 } 780 __va_end(va); 781 } 782 783 /* 784 * Shim cache_fullpath() to handle the case where a process is chrooted into 785 * a subdirectory of a mount. In this case if the root mount matches the 786 * process root directory's mount we have to specify the process's root 787 * directory instead of the mount point, because the mount point might 788 * be above the root directory. 789 */ 790 static 791 int 792 mount_path(struct proc *p, struct mount *mp, char **rb, char **fb) 793 { 794 struct nchandle *nch; 795 796 if (p && p->p_fd->fd_nrdir.mount == mp) 797 nch = &p->p_fd->fd_nrdir; 798 else 799 nch = &mp->mnt_ncmountpt; 800 return(cache_fullpath(p, nch, rb, fb)); 801 } 802 803 /* 804 * Sync each mounted filesystem. 805 */ 806 807 #ifdef DEBUG 808 static int syncprt = 0; 809 SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); 810 #endif /* DEBUG */ 811 812 static int sync_callback(struct mount *mp, void *data); 813 814 /* ARGSUSED */ 815 int 816 sys_sync(struct sync_args *uap) 817 { 818 mountlist_scan(sync_callback, NULL, MNTSCAN_FORWARD); 819 #ifdef DEBUG 820 /* 821 * print out buffer pool stat information on each sync() call. 822 */ 823 if (syncprt) 824 vfs_bufstats(); 825 #endif /* DEBUG */ 826 return (0); 827 } 828 829 static 830 int 831 sync_callback(struct mount *mp, void *data __unused) 832 { 833 int asyncflag; 834 835 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 836 asyncflag = mp->mnt_flag & MNT_ASYNC; 837 mp->mnt_flag &= ~MNT_ASYNC; 838 vfs_msync(mp, MNT_NOWAIT); 839 VFS_SYNC(mp, MNT_NOWAIT); 840 mp->mnt_flag |= asyncflag; 841 } 842 return(0); 843 } 844 845 /* XXX PRISON: could be per prison flag */ 846 static int prison_quotas; 847 #if 0 848 SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, ""); 849 #endif 850 851 /* 852 * quotactl_args(char *path, int fcmd, int uid, caddr_t arg) 853 * 854 * Change filesystem quotas. 855 */ 856 /* ARGSUSED */ 857 int 858 sys_quotactl(struct quotactl_args *uap) 859 { 860 struct nlookupdata nd; 861 struct thread *td; 862 struct proc *p; 863 struct mount *mp; 864 int error; 865 866 td = curthread; 867 p = td->td_proc; 868 if (p->p_ucred->cr_prison && !prison_quotas) 869 return (EPERM); 870 871 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 872 if (error == 0) 873 error = nlookup(&nd); 874 if (error == 0) { 875 mp = nd.nl_nch.mount; 876 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, 877 uap->arg, nd.nl_cred); 878 } 879 nlookup_done(&nd); 880 return (error); 881 } 882 883 /* 884 * mountctl(char *path, int op, int fd, const void *ctl, int ctllen, 885 * void *buf, int buflen) 886 * 887 * This function operates on a mount point and executes the specified 888 * operation using the specified control data, and possibly returns data. 889 * 890 * The actual number of bytes stored in the result buffer is returned, 0 891 * if none, otherwise an error is returned. 892 */ 893 /* ARGSUSED */ 894 int 895 sys_mountctl(struct mountctl_args *uap) 896 { 897 struct thread *td = curthread; 898 struct proc *p = td->td_proc; 899 struct file *fp; 900 void *ctl = NULL; 901 void *buf = NULL; 902 char *path = NULL; 903 int error; 904 905 /* 906 * Sanity and permissions checks. We must be root. 907 */ 908 KKASSERT(p); 909 if (p->p_ucred->cr_prison != NULL) 910 return (EPERM); 911 if ((uap->op != MOUNTCTL_MOUNTFLAGS) && 912 (error = priv_check(td, PRIV_ROOT)) != 0) 913 return (error); 914 915 /* 916 * Argument length checks 917 */ 918 if (uap->ctllen < 0 || uap->ctllen > 1024) 919 return (EINVAL); 920 if (uap->buflen < 0 || uap->buflen > 16 * 1024) 921 return (EINVAL); 922 if (uap->path == NULL) 923 return (EINVAL); 924 925 /* 926 * Allocate the necessary buffers and copyin data 927 */ 928 path = objcache_get(namei_oc, M_WAITOK); 929 error = copyinstr(uap->path, path, MAXPATHLEN, NULL); 930 if (error) 931 goto done; 932 933 if (uap->ctllen) { 934 ctl = kmalloc(uap->ctllen + 1, M_TEMP, M_WAITOK|M_ZERO); 935 error = copyin(uap->ctl, ctl, uap->ctllen); 936 if (error) 937 goto done; 938 } 939 if (uap->buflen) 940 buf = kmalloc(uap->buflen + 1, M_TEMP, M_WAITOK|M_ZERO); 941 942 /* 943 * Validate the descriptor 944 */ 945 if (uap->fd >= 0) { 946 fp = holdfp(p->p_fd, uap->fd, -1); 947 if (fp == NULL) { 948 error = EBADF; 949 goto done; 950 } 951 } else { 952 fp = NULL; 953 } 954 955 /* 956 * Execute the internal kernel function and clean up. 957 */ 958 error = kern_mountctl(path, uap->op, fp, ctl, uap->ctllen, buf, uap->buflen, &uap->sysmsg_result); 959 if (fp) 960 fdrop(fp); 961 if (error == 0 && uap->sysmsg_result > 0) 962 error = copyout(buf, uap->buf, uap->sysmsg_result); 963 done: 964 if (path) 965 objcache_put(namei_oc, path); 966 if (ctl) 967 kfree(ctl, M_TEMP); 968 if (buf) 969 kfree(buf, M_TEMP); 970 return (error); 971 } 972 973 /* 974 * Execute a mount control operation by resolving the path to a mount point 975 * and calling vop_mountctl(). 976 * 977 * Use the mount point from the nch instead of the vnode so nullfs mounts 978 * can properly spike the VOP. 979 */ 980 int 981 kern_mountctl(const char *path, int op, struct file *fp, 982 const void *ctl, int ctllen, 983 void *buf, int buflen, int *res) 984 { 985 struct vnode *vp; 986 struct mount *mp; 987 struct nlookupdata nd; 988 int error; 989 990 *res = 0; 991 vp = NULL; 992 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW); 993 if (error == 0) 994 error = nlookup(&nd); 995 if (error == 0) 996 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 997 mp = nd.nl_nch.mount; 998 nlookup_done(&nd); 999 if (error) 1000 return (error); 1001 vn_unlock(vp); 1002 1003 /* 1004 * Must be the root of the filesystem 1005 */ 1006 if ((vp->v_flag & (VROOT|VPFSROOT)) == 0) { 1007 vrele(vp); 1008 return (EINVAL); 1009 } 1010 error = vop_mountctl(mp->mnt_vn_use_ops, op, fp, ctl, ctllen, 1011 buf, buflen, res); 1012 vrele(vp); 1013 return (error); 1014 } 1015 1016 int 1017 kern_statfs(struct nlookupdata *nd, struct statfs *buf) 1018 { 1019 struct thread *td = curthread; 1020 struct proc *p = td->td_proc; 1021 struct mount *mp; 1022 struct statfs *sp; 1023 char *fullpath, *freepath; 1024 int error; 1025 1026 if ((error = nlookup(nd)) != 0) 1027 return (error); 1028 mp = nd->nl_nch.mount; 1029 sp = &mp->mnt_stat; 1030 if ((error = VFS_STATFS(mp, sp, nd->nl_cred)) != 0) 1031 return (error); 1032 1033 error = mount_path(p, mp, &fullpath, &freepath); 1034 if (error) 1035 return(error); 1036 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 1037 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 1038 kfree(freepath, M_TEMP); 1039 1040 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1041 bcopy(sp, buf, sizeof(*buf)); 1042 /* Only root should have access to the fsid's. */ 1043 if (priv_check(td, PRIV_ROOT)) 1044 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 1045 return (0); 1046 } 1047 1048 /* 1049 * statfs_args(char *path, struct statfs *buf) 1050 * 1051 * Get filesystem statistics. 1052 */ 1053 int 1054 sys_statfs(struct statfs_args *uap) 1055 { 1056 struct nlookupdata nd; 1057 struct statfs buf; 1058 int error; 1059 1060 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1061 if (error == 0) 1062 error = kern_statfs(&nd, &buf); 1063 nlookup_done(&nd); 1064 if (error == 0) 1065 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 1066 return (error); 1067 } 1068 1069 int 1070 kern_fstatfs(int fd, struct statfs *buf) 1071 { 1072 struct thread *td = curthread; 1073 struct proc *p = td->td_proc; 1074 struct file *fp; 1075 struct mount *mp; 1076 struct statfs *sp; 1077 char *fullpath, *freepath; 1078 int error; 1079 1080 KKASSERT(p); 1081 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 1082 return (error); 1083 mp = ((struct vnode *)fp->f_data)->v_mount; 1084 if (mp == NULL) { 1085 error = EBADF; 1086 goto done; 1087 } 1088 if (fp->f_cred == NULL) { 1089 error = EINVAL; 1090 goto done; 1091 } 1092 sp = &mp->mnt_stat; 1093 if ((error = VFS_STATFS(mp, sp, fp->f_cred)) != 0) 1094 goto done; 1095 1096 if ((error = mount_path(p, mp, &fullpath, &freepath)) != 0) 1097 goto done; 1098 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 1099 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 1100 kfree(freepath, M_TEMP); 1101 1102 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1103 bcopy(sp, buf, sizeof(*buf)); 1104 1105 /* Only root should have access to the fsid's. */ 1106 if (priv_check(td, PRIV_ROOT)) 1107 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 1108 error = 0; 1109 done: 1110 fdrop(fp); 1111 return (error); 1112 } 1113 1114 /* 1115 * fstatfs_args(int fd, struct statfs *buf) 1116 * 1117 * Get filesystem statistics. 1118 */ 1119 int 1120 sys_fstatfs(struct fstatfs_args *uap) 1121 { 1122 struct statfs buf; 1123 int error; 1124 1125 error = kern_fstatfs(uap->fd, &buf); 1126 1127 if (error == 0) 1128 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 1129 return (error); 1130 } 1131 1132 int 1133 kern_statvfs(struct nlookupdata *nd, struct statvfs *buf) 1134 { 1135 struct mount *mp; 1136 struct statvfs *sp; 1137 int error; 1138 1139 if ((error = nlookup(nd)) != 0) 1140 return (error); 1141 mp = nd->nl_nch.mount; 1142 sp = &mp->mnt_vstat; 1143 if ((error = VFS_STATVFS(mp, sp, nd->nl_cred)) != 0) 1144 return (error); 1145 1146 sp->f_flag = 0; 1147 if (mp->mnt_flag & MNT_RDONLY) 1148 sp->f_flag |= ST_RDONLY; 1149 if (mp->mnt_flag & MNT_NOSUID) 1150 sp->f_flag |= ST_NOSUID; 1151 bcopy(sp, buf, sizeof(*buf)); 1152 return (0); 1153 } 1154 1155 /* 1156 * statfs_args(char *path, struct statfs *buf) 1157 * 1158 * Get filesystem statistics. 1159 */ 1160 int 1161 sys_statvfs(struct statvfs_args *uap) 1162 { 1163 struct nlookupdata nd; 1164 struct statvfs buf; 1165 int error; 1166 1167 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1168 if (error == 0) 1169 error = kern_statvfs(&nd, &buf); 1170 nlookup_done(&nd); 1171 if (error == 0) 1172 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 1173 return (error); 1174 } 1175 1176 int 1177 kern_fstatvfs(int fd, struct statvfs *buf) 1178 { 1179 struct thread *td = curthread; 1180 struct proc *p = td->td_proc; 1181 struct file *fp; 1182 struct mount *mp; 1183 struct statvfs *sp; 1184 int error; 1185 1186 KKASSERT(p); 1187 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 1188 return (error); 1189 mp = ((struct vnode *)fp->f_data)->v_mount; 1190 if (mp == NULL) { 1191 error = EBADF; 1192 goto done; 1193 } 1194 if (fp->f_cred == NULL) { 1195 error = EINVAL; 1196 goto done; 1197 } 1198 sp = &mp->mnt_vstat; 1199 if ((error = VFS_STATVFS(mp, sp, fp->f_cred)) != 0) 1200 goto done; 1201 1202 sp->f_flag = 0; 1203 if (mp->mnt_flag & MNT_RDONLY) 1204 sp->f_flag |= ST_RDONLY; 1205 if (mp->mnt_flag & MNT_NOSUID) 1206 sp->f_flag |= ST_NOSUID; 1207 1208 bcopy(sp, buf, sizeof(*buf)); 1209 error = 0; 1210 done: 1211 fdrop(fp); 1212 return (error); 1213 } 1214 1215 /* 1216 * fstatfs_args(int fd, struct statfs *buf) 1217 * 1218 * Get filesystem statistics. 1219 */ 1220 int 1221 sys_fstatvfs(struct fstatvfs_args *uap) 1222 { 1223 struct statvfs buf; 1224 int error; 1225 1226 error = kern_fstatvfs(uap->fd, &buf); 1227 1228 if (error == 0) 1229 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 1230 return (error); 1231 } 1232 1233 /* 1234 * getfsstat_args(struct statfs *buf, long bufsize, int flags) 1235 * 1236 * Get statistics on all filesystems. 1237 */ 1238 1239 struct getfsstat_info { 1240 struct statfs *sfsp; 1241 long count; 1242 long maxcount; 1243 int error; 1244 int flags; 1245 struct proc *p; 1246 }; 1247 1248 static int getfsstat_callback(struct mount *, void *); 1249 1250 /* ARGSUSED */ 1251 int 1252 sys_getfsstat(struct getfsstat_args *uap) 1253 { 1254 struct thread *td = curthread; 1255 struct proc *p = td->td_proc; 1256 struct getfsstat_info info; 1257 1258 bzero(&info, sizeof(info)); 1259 1260 info.maxcount = uap->bufsize / sizeof(struct statfs); 1261 info.sfsp = uap->buf; 1262 info.count = 0; 1263 info.flags = uap->flags; 1264 info.p = p; 1265 1266 mountlist_scan(getfsstat_callback, &info, MNTSCAN_FORWARD); 1267 if (info.sfsp && info.count > info.maxcount) 1268 uap->sysmsg_result = info.maxcount; 1269 else 1270 uap->sysmsg_result = info.count; 1271 return (info.error); 1272 } 1273 1274 static int 1275 getfsstat_callback(struct mount *mp, void *data) 1276 { 1277 struct getfsstat_info *info = data; 1278 struct statfs *sp; 1279 char *freepath; 1280 char *fullpath; 1281 int error; 1282 1283 if (info->sfsp && info->count < info->maxcount) { 1284 if (info->p && !chroot_visible_mnt(mp, info->p)) 1285 return(0); 1286 sp = &mp->mnt_stat; 1287 1288 /* 1289 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1290 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY 1291 * overrides MNT_WAIT. 1292 */ 1293 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || 1294 (info->flags & MNT_WAIT)) && 1295 (error = VFS_STATFS(mp, sp, info->p->p_ucred))) { 1296 return(0); 1297 } 1298 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1299 1300 error = mount_path(info->p, mp, &fullpath, &freepath); 1301 if (error) { 1302 info->error = error; 1303 return(-1); 1304 } 1305 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 1306 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 1307 kfree(freepath, M_TEMP); 1308 1309 error = copyout(sp, info->sfsp, sizeof(*sp)); 1310 if (error) { 1311 info->error = error; 1312 return (-1); 1313 } 1314 ++info->sfsp; 1315 } 1316 info->count++; 1317 return(0); 1318 } 1319 1320 /* 1321 * getvfsstat_args(struct statfs *buf, struct statvfs *vbuf, 1322 long bufsize, int flags) 1323 * 1324 * Get statistics on all filesystems. 1325 */ 1326 1327 struct getvfsstat_info { 1328 struct statfs *sfsp; 1329 struct statvfs *vsfsp; 1330 long count; 1331 long maxcount; 1332 int error; 1333 int flags; 1334 struct proc *p; 1335 }; 1336 1337 static int getvfsstat_callback(struct mount *, void *); 1338 1339 /* ARGSUSED */ 1340 int 1341 sys_getvfsstat(struct getvfsstat_args *uap) 1342 { 1343 struct thread *td = curthread; 1344 struct proc *p = td->td_proc; 1345 struct getvfsstat_info info; 1346 1347 bzero(&info, sizeof(info)); 1348 1349 info.maxcount = uap->vbufsize / sizeof(struct statvfs); 1350 info.sfsp = uap->buf; 1351 info.vsfsp = uap->vbuf; 1352 info.count = 0; 1353 info.flags = uap->flags; 1354 info.p = p; 1355 1356 mountlist_scan(getvfsstat_callback, &info, MNTSCAN_FORWARD); 1357 if (info.vsfsp && info.count > info.maxcount) 1358 uap->sysmsg_result = info.maxcount; 1359 else 1360 uap->sysmsg_result = info.count; 1361 return (info.error); 1362 } 1363 1364 static int 1365 getvfsstat_callback(struct mount *mp, void *data) 1366 { 1367 struct getvfsstat_info *info = data; 1368 struct statfs *sp; 1369 struct statvfs *vsp; 1370 char *freepath; 1371 char *fullpath; 1372 int error; 1373 1374 if (info->vsfsp && info->count < info->maxcount) { 1375 if (info->p && !chroot_visible_mnt(mp, info->p)) 1376 return(0); 1377 sp = &mp->mnt_stat; 1378 vsp = &mp->mnt_vstat; 1379 1380 /* 1381 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1382 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY 1383 * overrides MNT_WAIT. 1384 */ 1385 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || 1386 (info->flags & MNT_WAIT)) && 1387 (error = VFS_STATFS(mp, sp, info->p->p_ucred))) { 1388 return(0); 1389 } 1390 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1391 1392 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || 1393 (info->flags & MNT_WAIT)) && 1394 (error = VFS_STATVFS(mp, vsp, info->p->p_ucred))) { 1395 return(0); 1396 } 1397 vsp->f_flag = 0; 1398 if (mp->mnt_flag & MNT_RDONLY) 1399 vsp->f_flag |= ST_RDONLY; 1400 if (mp->mnt_flag & MNT_NOSUID) 1401 vsp->f_flag |= ST_NOSUID; 1402 1403 error = mount_path(info->p, mp, &fullpath, &freepath); 1404 if (error) { 1405 info->error = error; 1406 return(-1); 1407 } 1408 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 1409 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 1410 kfree(freepath, M_TEMP); 1411 1412 error = copyout(sp, info->sfsp, sizeof(*sp)); 1413 if (error == 0) 1414 error = copyout(vsp, info->vsfsp, sizeof(*vsp)); 1415 if (error) { 1416 info->error = error; 1417 return (-1); 1418 } 1419 ++info->sfsp; 1420 ++info->vsfsp; 1421 } 1422 info->count++; 1423 return(0); 1424 } 1425 1426 1427 /* 1428 * fchdir_args(int fd) 1429 * 1430 * Change current working directory to a given file descriptor. 1431 */ 1432 /* ARGSUSED */ 1433 int 1434 sys_fchdir(struct fchdir_args *uap) 1435 { 1436 struct thread *td = curthread; 1437 struct proc *p = td->td_proc; 1438 struct filedesc *fdp = p->p_fd; 1439 struct vnode *vp, *ovp; 1440 struct mount *mp; 1441 struct file *fp; 1442 struct nchandle nch, onch, tnch; 1443 int error; 1444 1445 if ((error = holdvnode(fdp, uap->fd, &fp)) != 0) 1446 return (error); 1447 vp = (struct vnode *)fp->f_data; 1448 vref(vp); 1449 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1450 if (vp->v_type != VDIR || fp->f_nchandle.ncp == NULL) 1451 error = ENOTDIR; 1452 else 1453 error = VOP_ACCESS(vp, VEXEC, p->p_ucred); 1454 if (error) { 1455 vput(vp); 1456 fdrop(fp); 1457 return (error); 1458 } 1459 cache_copy(&fp->f_nchandle, &nch); 1460 1461 /* 1462 * If the ncp has become a mount point, traverse through 1463 * the mount point. 1464 */ 1465 1466 while (!error && (nch.ncp->nc_flag & NCF_ISMOUNTPT) && 1467 (mp = cache_findmount(&nch)) != NULL 1468 ) { 1469 error = nlookup_mp(mp, &tnch); 1470 if (error == 0) { 1471 cache_unlock(&tnch); /* leave ref intact */ 1472 vput(vp); 1473 vp = tnch.ncp->nc_vp; 1474 error = vget(vp, LK_SHARED); 1475 KKASSERT(error == 0); 1476 cache_drop(&nch); 1477 nch = tnch; 1478 } 1479 } 1480 if (error == 0) { 1481 ovp = fdp->fd_cdir; 1482 onch = fdp->fd_ncdir; 1483 vn_unlock(vp); /* leave ref intact */ 1484 fdp->fd_cdir = vp; 1485 fdp->fd_ncdir = nch; 1486 cache_drop(&onch); 1487 vrele(ovp); 1488 } else { 1489 cache_drop(&nch); 1490 vput(vp); 1491 } 1492 fdrop(fp); 1493 return (error); 1494 } 1495 1496 int 1497 kern_chdir(struct nlookupdata *nd) 1498 { 1499 struct thread *td = curthread; 1500 struct proc *p = td->td_proc; 1501 struct filedesc *fdp = p->p_fd; 1502 struct vnode *vp, *ovp; 1503 struct nchandle onch; 1504 int error; 1505 1506 if ((error = nlookup(nd)) != 0) 1507 return (error); 1508 if ((vp = nd->nl_nch.ncp->nc_vp) == NULL) 1509 return (ENOENT); 1510 if ((error = vget(vp, LK_SHARED)) != 0) 1511 return (error); 1512 1513 error = checkvp_chdir(vp, td); 1514 vn_unlock(vp); 1515 if (error == 0) { 1516 ovp = fdp->fd_cdir; 1517 onch = fdp->fd_ncdir; 1518 cache_unlock(&nd->nl_nch); /* leave reference intact */ 1519 fdp->fd_ncdir = nd->nl_nch; 1520 fdp->fd_cdir = vp; 1521 cache_drop(&onch); 1522 vrele(ovp); 1523 cache_zero(&nd->nl_nch); 1524 } else { 1525 vrele(vp); 1526 } 1527 return (error); 1528 } 1529 1530 /* 1531 * chdir_args(char *path) 1532 * 1533 * Change current working directory (``.''). 1534 */ 1535 int 1536 sys_chdir(struct chdir_args *uap) 1537 { 1538 struct nlookupdata nd; 1539 int error; 1540 1541 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1542 if (error == 0) 1543 error = kern_chdir(&nd); 1544 nlookup_done(&nd); 1545 return (error); 1546 } 1547 1548 /* 1549 * Helper function for raised chroot(2) security function: Refuse if 1550 * any filedescriptors are open directories. 1551 */ 1552 static int 1553 chroot_refuse_vdir_fds(struct filedesc *fdp) 1554 { 1555 struct vnode *vp; 1556 struct file *fp; 1557 int error; 1558 int fd; 1559 1560 for (fd = 0; fd < fdp->fd_nfiles ; fd++) { 1561 if ((error = holdvnode(fdp, fd, &fp)) != 0) 1562 continue; 1563 vp = (struct vnode *)fp->f_data; 1564 if (vp->v_type != VDIR) { 1565 fdrop(fp); 1566 continue; 1567 } 1568 fdrop(fp); 1569 return(EPERM); 1570 } 1571 return (0); 1572 } 1573 1574 /* 1575 * This sysctl determines if we will allow a process to chroot(2) if it 1576 * has a directory open: 1577 * 0: disallowed for all processes. 1578 * 1: allowed for processes that were not already chroot(2)'ed. 1579 * 2: allowed for all processes. 1580 */ 1581 1582 static int chroot_allow_open_directories = 1; 1583 1584 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, 1585 &chroot_allow_open_directories, 0, ""); 1586 1587 /* 1588 * chroot to the specified namecache entry. We obtain the vp from the 1589 * namecache data. The passed ncp must be locked and referenced and will 1590 * remain locked and referenced on return. 1591 */ 1592 int 1593 kern_chroot(struct nchandle *nch) 1594 { 1595 struct thread *td = curthread; 1596 struct proc *p = td->td_proc; 1597 struct filedesc *fdp = p->p_fd; 1598 struct vnode *vp; 1599 int error; 1600 1601 /* 1602 * Only privileged user can chroot 1603 */ 1604 error = priv_check_cred(p->p_ucred, PRIV_VFS_CHROOT, 0); 1605 if (error) 1606 return (error); 1607 1608 /* 1609 * Disallow open directory descriptors (fchdir() breakouts). 1610 */ 1611 if (chroot_allow_open_directories == 0 || 1612 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { 1613 if ((error = chroot_refuse_vdir_fds(fdp)) != 0) 1614 return (error); 1615 } 1616 if ((vp = nch->ncp->nc_vp) == NULL) 1617 return (ENOENT); 1618 1619 if ((error = vget(vp, LK_SHARED)) != 0) 1620 return (error); 1621 1622 /* 1623 * Check the validity of vp as a directory to change to and 1624 * associate it with rdir/jdir. 1625 */ 1626 error = checkvp_chdir(vp, td); 1627 vn_unlock(vp); /* leave reference intact */ 1628 if (error == 0) { 1629 vrele(fdp->fd_rdir); 1630 fdp->fd_rdir = vp; /* reference inherited by fd_rdir */ 1631 cache_drop(&fdp->fd_nrdir); 1632 cache_copy(nch, &fdp->fd_nrdir); 1633 if (fdp->fd_jdir == NULL) { 1634 fdp->fd_jdir = vp; 1635 vref(fdp->fd_jdir); 1636 cache_copy(nch, &fdp->fd_njdir); 1637 } 1638 } else { 1639 vrele(vp); 1640 } 1641 return (error); 1642 } 1643 1644 /* 1645 * chroot_args(char *path) 1646 * 1647 * Change notion of root (``/'') directory. 1648 */ 1649 /* ARGSUSED */ 1650 int 1651 sys_chroot(struct chroot_args *uap) 1652 { 1653 struct thread *td = curthread; 1654 struct nlookupdata nd; 1655 int error; 1656 1657 KKASSERT(td->td_proc); 1658 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1659 if (error) { 1660 nlookup_done(&nd); 1661 return(error); 1662 } 1663 nd.nl_flags |= NLC_EXEC; 1664 error = nlookup(&nd); 1665 if (error == 0) 1666 error = kern_chroot(&nd.nl_nch); 1667 nlookup_done(&nd); 1668 return(error); 1669 } 1670 1671 /* 1672 * Common routine for chroot and chdir. Given a locked, referenced vnode, 1673 * determine whether it is legal to chdir to the vnode. The vnode's state 1674 * is not changed by this call. 1675 */ 1676 int 1677 checkvp_chdir(struct vnode *vp, struct thread *td) 1678 { 1679 int error; 1680 1681 if (vp->v_type != VDIR) 1682 error = ENOTDIR; 1683 else 1684 error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred); 1685 return (error); 1686 } 1687 1688 int 1689 kern_open(struct nlookupdata *nd, int oflags, int mode, int *res) 1690 { 1691 struct thread *td = curthread; 1692 struct proc *p = td->td_proc; 1693 struct lwp *lp = td->td_lwp; 1694 struct filedesc *fdp = p->p_fd; 1695 int cmode, flags; 1696 struct file *nfp; 1697 struct file *fp; 1698 struct vnode *vp; 1699 int type, indx, error; 1700 struct flock lf; 1701 1702 if ((oflags & O_ACCMODE) == O_ACCMODE) 1703 return (EINVAL); 1704 flags = FFLAGS(oflags); 1705 error = falloc(p, &nfp, NULL); 1706 if (error) 1707 return (error); 1708 fp = nfp; 1709 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; 1710 1711 /* 1712 * XXX p_dupfd is a real mess. It allows a device to return a 1713 * file descriptor to be duplicated rather then doing the open 1714 * itself. 1715 */ 1716 lp->lwp_dupfd = -1; 1717 1718 /* 1719 * Call vn_open() to do the lookup and assign the vnode to the 1720 * file pointer. vn_open() does not change the ref count on fp 1721 * and the vnode, on success, will be inherited by the file pointer 1722 * and unlocked. 1723 */ 1724 nd->nl_flags |= NLC_LOCKVP; 1725 error = vn_open(nd, fp, flags, cmode); 1726 nlookup_done(nd); 1727 if (error) { 1728 /* 1729 * handle special fdopen() case. bleh. dupfdopen() is 1730 * responsible for dropping the old contents of ofiles[indx] 1731 * if it succeeds. 1732 * 1733 * Note that fsetfd() will add a ref to fp which represents 1734 * the fd_files[] assignment. We must still drop our 1735 * reference. 1736 */ 1737 if ((error == ENODEV || error == ENXIO) && lp->lwp_dupfd >= 0) { 1738 if (fdalloc(p, 0, &indx) == 0) { 1739 error = dupfdopen(p, indx, lp->lwp_dupfd, flags, error); 1740 if (error == 0) { 1741 *res = indx; 1742 fdrop(fp); /* our ref */ 1743 return (0); 1744 } 1745 fsetfd(p, NULL, indx); 1746 } 1747 } 1748 fdrop(fp); /* our ref */ 1749 if (error == ERESTART) 1750 error = EINTR; 1751 return (error); 1752 } 1753 1754 /* 1755 * ref the vnode for ourselves so it can't be ripped out from under 1756 * is. XXX need an ND flag to request that the vnode be returned 1757 * anyway. 1758 * 1759 * Reserve a file descriptor but do not assign it until the open 1760 * succeeds. 1761 */ 1762 vp = (struct vnode *)fp->f_data; 1763 vref(vp); 1764 if ((error = fdalloc(p, 0, &indx)) != 0) { 1765 fdrop(fp); 1766 vrele(vp); 1767 return (error); 1768 } 1769 1770 /* 1771 * If no error occurs the vp will have been assigned to the file 1772 * pointer. 1773 */ 1774 lp->lwp_dupfd = 0; 1775 1776 if (flags & (O_EXLOCK | O_SHLOCK)) { 1777 lf.l_whence = SEEK_SET; 1778 lf.l_start = 0; 1779 lf.l_len = 0; 1780 if (flags & O_EXLOCK) 1781 lf.l_type = F_WRLCK; 1782 else 1783 lf.l_type = F_RDLCK; 1784 if (flags & FNONBLOCK) 1785 type = 0; 1786 else 1787 type = F_WAIT; 1788 1789 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { 1790 /* 1791 * lock request failed. Clean up the reserved 1792 * descriptor. 1793 */ 1794 vrele(vp); 1795 fsetfd(p, NULL, indx); 1796 fdrop(fp); 1797 return (error); 1798 } 1799 fp->f_flag |= FHASLOCK; 1800 } 1801 #if 0 1802 /* 1803 * Assert that all regular file vnodes were created with a object. 1804 */ 1805 KASSERT(vp->v_type != VREG || vp->v_object != NULL, 1806 ("open: regular file has no backing object after vn_open")); 1807 #endif 1808 1809 vrele(vp); 1810 1811 /* 1812 * release our private reference, leaving the one associated with the 1813 * descriptor table intact. 1814 */ 1815 fsetfd(p, fp, indx); 1816 fdrop(fp); 1817 *res = indx; 1818 return (0); 1819 } 1820 1821 /* 1822 * open_args(char *path, int flags, int mode) 1823 * 1824 * Check permissions, allocate an open file structure, 1825 * and call the device open routine if any. 1826 */ 1827 int 1828 sys_open(struct open_args *uap) 1829 { 1830 struct nlookupdata nd; 1831 int error; 1832 1833 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1834 if (error == 0) { 1835 error = kern_open(&nd, uap->flags, 1836 uap->mode, &uap->sysmsg_result); 1837 } 1838 nlookup_done(&nd); 1839 return (error); 1840 } 1841 1842 /* 1843 * openat_args(int fd, char *path, int flags, int mode) 1844 */ 1845 int 1846 sys_openat(struct openat_args *uap) 1847 { 1848 struct nlookupdata nd; 1849 int error; 1850 struct file *fp; 1851 1852 error = nlookup_init_at(&nd, &fp, uap->fd, uap->path, UIO_USERSPACE, 0); 1853 if (error == 0) { 1854 error = kern_open(&nd, uap->flags, uap->mode, 1855 &uap->sysmsg_result); 1856 } 1857 nlookup_done_at(&nd, fp); 1858 return (error); 1859 } 1860 1861 int 1862 kern_mknod(struct nlookupdata *nd, int mode, int rmajor, int rminor) 1863 { 1864 struct thread *td = curthread; 1865 struct proc *p = td->td_proc; 1866 struct vnode *vp; 1867 struct vattr vattr; 1868 int error; 1869 int whiteout = 0; 1870 1871 KKASSERT(p); 1872 1873 VATTR_NULL(&vattr); 1874 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; 1875 vattr.va_rmajor = rmajor; 1876 vattr.va_rminor = rminor; 1877 1878 switch (mode & S_IFMT) { 1879 case S_IFMT: /* used by badsect to flag bad sectors */ 1880 error = priv_check_cred(p->p_ucred, PRIV_VFS_MKNOD_BAD, 0); 1881 vattr.va_type = VBAD; 1882 break; 1883 case S_IFCHR: 1884 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1885 vattr.va_type = VCHR; 1886 break; 1887 case S_IFBLK: 1888 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1889 vattr.va_type = VBLK; 1890 break; 1891 case S_IFWHT: 1892 error = priv_check_cred(p->p_ucred, PRIV_VFS_MKNOD_WHT, 0); 1893 whiteout = 1; 1894 break; 1895 case S_IFDIR: /* special directories support for HAMMER */ 1896 error = priv_check_cred(p->p_ucred, PRIV_VFS_MKNOD_DIR, 0); 1897 vattr.va_type = VDIR; 1898 break; 1899 default: 1900 error = EINVAL; 1901 break; 1902 } 1903 1904 if (error) 1905 return (error); 1906 1907 bwillinode(1); 1908 nd->nl_flags |= NLC_CREATE | NLC_REFDVP; 1909 if ((error = nlookup(nd)) != 0) 1910 return (error); 1911 if (nd->nl_nch.ncp->nc_vp) 1912 return (EEXIST); 1913 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 1914 return (error); 1915 1916 if (whiteout) { 1917 error = VOP_NWHITEOUT(&nd->nl_nch, nd->nl_dvp, 1918 nd->nl_cred, NAMEI_CREATE); 1919 } else { 1920 vp = NULL; 1921 error = VOP_NMKNOD(&nd->nl_nch, nd->nl_dvp, 1922 &vp, nd->nl_cred, &vattr); 1923 if (error == 0) 1924 vput(vp); 1925 } 1926 return (error); 1927 } 1928 1929 /* 1930 * mknod_args(char *path, int mode, int dev) 1931 * 1932 * Create a special file. 1933 */ 1934 int 1935 sys_mknod(struct mknod_args *uap) 1936 { 1937 struct nlookupdata nd; 1938 int error; 1939 1940 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1941 if (error == 0) { 1942 error = kern_mknod(&nd, uap->mode, 1943 umajor(uap->dev), uminor(uap->dev)); 1944 } 1945 nlookup_done(&nd); 1946 return (error); 1947 } 1948 1949 int 1950 kern_mkfifo(struct nlookupdata *nd, int mode) 1951 { 1952 struct thread *td = curthread; 1953 struct proc *p = td->td_proc; 1954 struct vattr vattr; 1955 struct vnode *vp; 1956 int error; 1957 1958 bwillinode(1); 1959 1960 nd->nl_flags |= NLC_CREATE | NLC_REFDVP; 1961 if ((error = nlookup(nd)) != 0) 1962 return (error); 1963 if (nd->nl_nch.ncp->nc_vp) 1964 return (EEXIST); 1965 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 1966 return (error); 1967 1968 VATTR_NULL(&vattr); 1969 vattr.va_type = VFIFO; 1970 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; 1971 vp = NULL; 1972 error = VOP_NMKNOD(&nd->nl_nch, nd->nl_dvp, &vp, nd->nl_cred, &vattr); 1973 if (error == 0) 1974 vput(vp); 1975 return (error); 1976 } 1977 1978 /* 1979 * mkfifo_args(char *path, int mode) 1980 * 1981 * Create a named pipe. 1982 */ 1983 int 1984 sys_mkfifo(struct mkfifo_args *uap) 1985 { 1986 struct nlookupdata nd; 1987 int error; 1988 1989 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1990 if (error == 0) 1991 error = kern_mkfifo(&nd, uap->mode); 1992 nlookup_done(&nd); 1993 return (error); 1994 } 1995 1996 static int hardlink_check_uid = 0; 1997 SYSCTL_INT(_security, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1998 &hardlink_check_uid, 0, 1999 "Unprivileged processes cannot create hard links to files owned by other " 2000 "users"); 2001 static int hardlink_check_gid = 0; 2002 SYSCTL_INT(_security, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 2003 &hardlink_check_gid, 0, 2004 "Unprivileged processes cannot create hard links to files owned by other " 2005 "groups"); 2006 2007 static int 2008 can_hardlink(struct vnode *vp, struct thread *td, struct ucred *cred) 2009 { 2010 struct vattr va; 2011 int error; 2012 2013 /* 2014 * Shortcut if disabled 2015 */ 2016 if (hardlink_check_uid == 0 && hardlink_check_gid == 0) 2017 return (0); 2018 2019 /* 2020 * Privileged user can always hardlink 2021 */ 2022 if (priv_check_cred(cred, PRIV_VFS_LINK, 0) == 0) 2023 return (0); 2024 2025 /* 2026 * Otherwise only if the originating file is owned by the 2027 * same user or group. Note that any group is allowed if 2028 * the file is owned by the caller. 2029 */ 2030 error = VOP_GETATTR(vp, &va); 2031 if (error != 0) 2032 return (error); 2033 2034 if (hardlink_check_uid) { 2035 if (cred->cr_uid != va.va_uid) 2036 return (EPERM); 2037 } 2038 2039 if (hardlink_check_gid) { 2040 if (cred->cr_uid != va.va_uid && !groupmember(va.va_gid, cred)) 2041 return (EPERM); 2042 } 2043 2044 return (0); 2045 } 2046 2047 int 2048 kern_link(struct nlookupdata *nd, struct nlookupdata *linknd) 2049 { 2050 struct thread *td = curthread; 2051 struct vnode *vp; 2052 int error; 2053 2054 /* 2055 * Lookup the source and obtained a locked vnode. 2056 * 2057 * You may only hardlink a file which you have write permission 2058 * on or which you own. 2059 * 2060 * XXX relookup on vget failure / race ? 2061 */ 2062 bwillinode(1); 2063 nd->nl_flags |= NLC_WRITE | NLC_OWN | NLC_HLINK; 2064 if ((error = nlookup(nd)) != 0) 2065 return (error); 2066 vp = nd->nl_nch.ncp->nc_vp; 2067 KKASSERT(vp != NULL); 2068 if (vp->v_type == VDIR) 2069 return (EPERM); /* POSIX */ 2070 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 2071 return (error); 2072 if ((error = vget(vp, LK_EXCLUSIVE)) != 0) 2073 return (error); 2074 2075 /* 2076 * Unlock the source so we can lookup the target without deadlocking 2077 * (XXX vp is locked already, possible other deadlock?). The target 2078 * must not exist. 2079 */ 2080 KKASSERT(nd->nl_flags & NLC_NCPISLOCKED); 2081 nd->nl_flags &= ~NLC_NCPISLOCKED; 2082 cache_unlock(&nd->nl_nch); 2083 2084 linknd->nl_flags |= NLC_CREATE | NLC_REFDVP; 2085 if ((error = nlookup(linknd)) != 0) { 2086 vput(vp); 2087 return (error); 2088 } 2089 if (linknd->nl_nch.ncp->nc_vp) { 2090 vput(vp); 2091 return (EEXIST); 2092 } 2093 2094 /* 2095 * Finally run the new API VOP. 2096 */ 2097 error = can_hardlink(vp, td, td->td_proc->p_ucred); 2098 if (error == 0) { 2099 error = VOP_NLINK(&linknd->nl_nch, linknd->nl_dvp, 2100 vp, linknd->nl_cred); 2101 } 2102 vput(vp); 2103 return (error); 2104 } 2105 2106 /* 2107 * link_args(char *path, char *link) 2108 * 2109 * Make a hard file link. 2110 */ 2111 int 2112 sys_link(struct link_args *uap) 2113 { 2114 struct nlookupdata nd, linknd; 2115 int error; 2116 2117 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2118 if (error == 0) { 2119 error = nlookup_init(&linknd, uap->link, UIO_USERSPACE, 0); 2120 if (error == 0) 2121 error = kern_link(&nd, &linknd); 2122 nlookup_done(&linknd); 2123 } 2124 nlookup_done(&nd); 2125 return (error); 2126 } 2127 2128 int 2129 kern_symlink(struct nlookupdata *nd, char *path, int mode) 2130 { 2131 struct vattr vattr; 2132 struct vnode *vp; 2133 struct vnode *dvp; 2134 int error; 2135 2136 bwillinode(1); 2137 nd->nl_flags |= NLC_CREATE | NLC_REFDVP; 2138 if ((error = nlookup(nd)) != 0) 2139 return (error); 2140 if (nd->nl_nch.ncp->nc_vp) 2141 return (EEXIST); 2142 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 2143 return (error); 2144 dvp = nd->nl_dvp; 2145 VATTR_NULL(&vattr); 2146 vattr.va_mode = mode; 2147 error = VOP_NSYMLINK(&nd->nl_nch, dvp, &vp, nd->nl_cred, &vattr, path); 2148 if (error == 0) 2149 vput(vp); 2150 return (error); 2151 } 2152 2153 /* 2154 * symlink(char *path, char *link) 2155 * 2156 * Make a symbolic link. 2157 */ 2158 int 2159 sys_symlink(struct symlink_args *uap) 2160 { 2161 struct thread *td = curthread; 2162 struct nlookupdata nd; 2163 char *path; 2164 int error; 2165 int mode; 2166 2167 path = objcache_get(namei_oc, M_WAITOK); 2168 error = copyinstr(uap->path, path, MAXPATHLEN, NULL); 2169 if (error == 0) { 2170 error = nlookup_init(&nd, uap->link, UIO_USERSPACE, 0); 2171 if (error == 0) { 2172 mode = ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask; 2173 error = kern_symlink(&nd, path, mode); 2174 } 2175 nlookup_done(&nd); 2176 } 2177 objcache_put(namei_oc, path); 2178 return (error); 2179 } 2180 2181 /* 2182 * undelete_args(char *path) 2183 * 2184 * Delete a whiteout from the filesystem. 2185 */ 2186 /* ARGSUSED */ 2187 int 2188 sys_undelete(struct undelete_args *uap) 2189 { 2190 struct nlookupdata nd; 2191 int error; 2192 2193 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2194 bwillinode(1); 2195 nd.nl_flags |= NLC_DELETE | NLC_REFDVP; 2196 if (error == 0) 2197 error = nlookup(&nd); 2198 if (error == 0) 2199 error = ncp_writechk(&nd.nl_nch); 2200 if (error == 0) { 2201 error = VOP_NWHITEOUT(&nd.nl_nch, nd.nl_dvp, nd.nl_cred, 2202 NAMEI_DELETE); 2203 } 2204 nlookup_done(&nd); 2205 return (error); 2206 } 2207 2208 int 2209 kern_unlink(struct nlookupdata *nd) 2210 { 2211 int error; 2212 2213 bwillinode(1); 2214 nd->nl_flags |= NLC_DELETE | NLC_REFDVP; 2215 if ((error = nlookup(nd)) != 0) 2216 return (error); 2217 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 2218 return (error); 2219 error = VOP_NREMOVE(&nd->nl_nch, nd->nl_dvp, nd->nl_cred); 2220 return (error); 2221 } 2222 2223 /* 2224 * unlink_args(char *path) 2225 * 2226 * Delete a name from the filesystem. 2227 */ 2228 int 2229 sys_unlink(struct unlink_args *uap) 2230 { 2231 struct nlookupdata nd; 2232 int error; 2233 2234 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2235 if (error == 0) 2236 error = kern_unlink(&nd); 2237 nlookup_done(&nd); 2238 return (error); 2239 } 2240 2241 2242 /* 2243 * unlinkat_args(int fd, char *path, int flags) 2244 * 2245 * Delete the file or directory entry pointed to by fd/path. 2246 */ 2247 int 2248 sys_unlinkat(struct unlinkat_args *uap) 2249 { 2250 struct nlookupdata nd; 2251 struct file *fp; 2252 int error; 2253 2254 if (uap->flags & ~AT_REMOVEDIR) 2255 return (EINVAL); 2256 2257 error = nlookup_init_at(&nd, &fp, uap->fd, uap->path, UIO_USERSPACE, 0); 2258 if (error == 0) { 2259 if (uap->flags & AT_REMOVEDIR) 2260 error = kern_rmdir(&nd); 2261 else 2262 error = kern_unlink(&nd); 2263 } 2264 nlookup_done_at(&nd, fp); 2265 return (error); 2266 } 2267 2268 int 2269 kern_lseek(int fd, off_t offset, int whence, off_t *res) 2270 { 2271 struct thread *td = curthread; 2272 struct proc *p = td->td_proc; 2273 struct file *fp; 2274 struct vnode *vp; 2275 struct vattr vattr; 2276 off_t new_offset; 2277 int error; 2278 2279 fp = holdfp(p->p_fd, fd, -1); 2280 if (fp == NULL) 2281 return (EBADF); 2282 if (fp->f_type != DTYPE_VNODE) { 2283 error = ESPIPE; 2284 goto done; 2285 } 2286 vp = (struct vnode *)fp->f_data; 2287 2288 switch (whence) { 2289 case L_INCR: 2290 new_offset = fp->f_offset + offset; 2291 error = 0; 2292 break; 2293 case L_XTND: 2294 error = VOP_GETATTR(vp, &vattr); 2295 new_offset = offset + vattr.va_size; 2296 break; 2297 case L_SET: 2298 new_offset = offset; 2299 error = 0; 2300 break; 2301 default: 2302 new_offset = 0; 2303 error = EINVAL; 2304 break; 2305 } 2306 2307 /* 2308 * Validate the seek position. Negative offsets are not allowed 2309 * for regular files or directories. 2310 * 2311 * Normally we would also not want to allow negative offsets for 2312 * character and block-special devices. However kvm addresses 2313 * on 64 bit architectures might appear to be negative and must 2314 * be allowed. 2315 */ 2316 if (error == 0) { 2317 if (new_offset < 0 && 2318 (vp->v_type == VREG || vp->v_type == VDIR)) { 2319 error = EINVAL; 2320 } else { 2321 fp->f_offset = new_offset; 2322 } 2323 } 2324 *res = fp->f_offset; 2325 done: 2326 fdrop(fp); 2327 return (error); 2328 } 2329 2330 /* 2331 * lseek_args(int fd, int pad, off_t offset, int whence) 2332 * 2333 * Reposition read/write file offset. 2334 */ 2335 int 2336 sys_lseek(struct lseek_args *uap) 2337 { 2338 int error; 2339 2340 error = kern_lseek(uap->fd, uap->offset, uap->whence, 2341 &uap->sysmsg_offset); 2342 2343 return (error); 2344 } 2345 2346 /* 2347 * Check if current process can access given file. amode is a bitmask of *_OK 2348 * access bits. flags is a bitmask of AT_* flags. 2349 */ 2350 int 2351 kern_access(struct nlookupdata *nd, int amode, int flags) 2352 { 2353 struct vnode *vp; 2354 int error, mode; 2355 2356 if (flags & ~AT_EACCESS) 2357 return (EINVAL); 2358 if ((error = nlookup(nd)) != 0) 2359 return (error); 2360 retry: 2361 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &vp); 2362 if (error) 2363 return (error); 2364 2365 /* Flags == 0 means only check for existence. */ 2366 if (amode) { 2367 mode = 0; 2368 if (amode & R_OK) 2369 mode |= VREAD; 2370 if (amode & W_OK) 2371 mode |= VWRITE; 2372 if (amode & X_OK) 2373 mode |= VEXEC; 2374 if ((mode & VWRITE) == 0 || 2375 (error = vn_writechk(vp, &nd->nl_nch)) == 0) 2376 error = VOP_ACCESS_FLAGS(vp, mode, flags, nd->nl_cred); 2377 2378 /* 2379 * If the file handle is stale we have to re-resolve the 2380 * entry. This is a hack at the moment. 2381 */ 2382 if (error == ESTALE) { 2383 vput(vp); 2384 cache_setunresolved(&nd->nl_nch); 2385 error = cache_resolve(&nd->nl_nch, nd->nl_cred); 2386 if (error == 0) { 2387 vp = NULL; 2388 goto retry; 2389 } 2390 return(error); 2391 } 2392 } 2393 vput(vp); 2394 return (error); 2395 } 2396 2397 /* 2398 * access_args(char *path, int flags) 2399 * 2400 * Check access permissions. 2401 */ 2402 int 2403 sys_access(struct access_args *uap) 2404 { 2405 struct nlookupdata nd; 2406 int error; 2407 2408 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2409 if (error == 0) 2410 error = kern_access(&nd, uap->flags, 0); 2411 nlookup_done(&nd); 2412 return (error); 2413 } 2414 2415 2416 /* 2417 * faccessat_args(int fd, char *path, int amode, int flags) 2418 * 2419 * Check access permissions. 2420 */ 2421 int 2422 sys_faccessat(struct faccessat_args *uap) 2423 { 2424 struct nlookupdata nd; 2425 struct file *fp; 2426 int error; 2427 2428 error = nlookup_init_at(&nd, &fp, uap->fd, uap->path, UIO_USERSPACE, 2429 NLC_FOLLOW); 2430 if (error == 0) 2431 error = kern_access(&nd, uap->amode, uap->flags); 2432 nlookup_done_at(&nd, fp); 2433 return (error); 2434 } 2435 2436 2437 int 2438 kern_stat(struct nlookupdata *nd, struct stat *st) 2439 { 2440 int error; 2441 struct vnode *vp; 2442 thread_t td; 2443 2444 if ((error = nlookup(nd)) != 0) 2445 return (error); 2446 again: 2447 if ((vp = nd->nl_nch.ncp->nc_vp) == NULL) 2448 return (ENOENT); 2449 2450 td = curthread; 2451 if ((error = vget(vp, LK_SHARED)) != 0) 2452 return (error); 2453 error = vn_stat(vp, st, nd->nl_cred); 2454 2455 /* 2456 * If the file handle is stale we have to re-resolve the entry. This 2457 * is a hack at the moment. 2458 */ 2459 if (error == ESTALE) { 2460 vput(vp); 2461 cache_setunresolved(&nd->nl_nch); 2462 error = cache_resolve(&nd->nl_nch, nd->nl_cred); 2463 if (error == 0) 2464 goto again; 2465 } else { 2466 vput(vp); 2467 } 2468 return (error); 2469 } 2470 2471 /* 2472 * stat_args(char *path, struct stat *ub) 2473 * 2474 * Get file status; this version follows links. 2475 */ 2476 int 2477 sys_stat(struct stat_args *uap) 2478 { 2479 struct nlookupdata nd; 2480 struct stat st; 2481 int error; 2482 2483 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2484 if (error == 0) { 2485 error = kern_stat(&nd, &st); 2486 if (error == 0) 2487 error = copyout(&st, uap->ub, sizeof(*uap->ub)); 2488 } 2489 nlookup_done(&nd); 2490 return (error); 2491 } 2492 2493 /* 2494 * lstat_args(char *path, struct stat *ub) 2495 * 2496 * Get file status; this version does not follow links. 2497 */ 2498 int 2499 sys_lstat(struct lstat_args *uap) 2500 { 2501 struct nlookupdata nd; 2502 struct stat st; 2503 int error; 2504 2505 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2506 if (error == 0) { 2507 error = kern_stat(&nd, &st); 2508 if (error == 0) 2509 error = copyout(&st, uap->ub, sizeof(*uap->ub)); 2510 } 2511 nlookup_done(&nd); 2512 return (error); 2513 } 2514 2515 /* 2516 * fstatat_args(int fd, char *path, struct stat *sb, int flags) 2517 * 2518 * Get status of file pointed to by fd/path. 2519 */ 2520 int 2521 sys_fstatat(struct fstatat_args *uap) 2522 { 2523 struct nlookupdata nd; 2524 struct stat st; 2525 int error; 2526 int flags; 2527 struct file *fp; 2528 2529 if (uap->flags & ~AT_SYMLINK_NOFOLLOW) 2530 return (EINVAL); 2531 2532 flags = (uap->flags & AT_SYMLINK_NOFOLLOW) ? 0 : NLC_FOLLOW; 2533 2534 error = nlookup_init_at(&nd, &fp, uap->fd, uap->path, 2535 UIO_USERSPACE, flags); 2536 if (error == 0) { 2537 error = kern_stat(&nd, &st); 2538 if (error == 0) 2539 error = copyout(&st, uap->sb, sizeof(*uap->sb)); 2540 } 2541 nlookup_done_at(&nd, fp); 2542 return (error); 2543 } 2544 2545 /* 2546 * pathconf_Args(char *path, int name) 2547 * 2548 * Get configurable pathname variables. 2549 */ 2550 /* ARGSUSED */ 2551 int 2552 sys_pathconf(struct pathconf_args *uap) 2553 { 2554 struct nlookupdata nd; 2555 struct vnode *vp; 2556 int error; 2557 2558 vp = NULL; 2559 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2560 if (error == 0) 2561 error = nlookup(&nd); 2562 if (error == 0) 2563 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 2564 nlookup_done(&nd); 2565 if (error == 0) { 2566 error = VOP_PATHCONF(vp, uap->name, &uap->sysmsg_reg); 2567 vput(vp); 2568 } 2569 return (error); 2570 } 2571 2572 /* 2573 * XXX: daver 2574 * kern_readlink isn't properly split yet. There is a copyin burried 2575 * in VOP_READLINK(). 2576 */ 2577 int 2578 kern_readlink(struct nlookupdata *nd, char *buf, int count, int *res) 2579 { 2580 struct thread *td = curthread; 2581 struct proc *p = td->td_proc; 2582 struct vnode *vp; 2583 struct iovec aiov; 2584 struct uio auio; 2585 int error; 2586 2587 if ((error = nlookup(nd)) != 0) 2588 return (error); 2589 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &vp); 2590 if (error) 2591 return (error); 2592 if (vp->v_type != VLNK) { 2593 error = EINVAL; 2594 } else { 2595 aiov.iov_base = buf; 2596 aiov.iov_len = count; 2597 auio.uio_iov = &aiov; 2598 auio.uio_iovcnt = 1; 2599 auio.uio_offset = 0; 2600 auio.uio_rw = UIO_READ; 2601 auio.uio_segflg = UIO_USERSPACE; 2602 auio.uio_td = td; 2603 auio.uio_resid = count; 2604 error = VOP_READLINK(vp, &auio, p->p_ucred); 2605 } 2606 vput(vp); 2607 *res = count - auio.uio_resid; 2608 return (error); 2609 } 2610 2611 /* 2612 * readlink_args(char *path, char *buf, int count) 2613 * 2614 * Return target name of a symbolic link. 2615 */ 2616 int 2617 sys_readlink(struct readlink_args *uap) 2618 { 2619 struct nlookupdata nd; 2620 int error; 2621 2622 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2623 if (error == 0) { 2624 error = kern_readlink(&nd, uap->buf, uap->count, 2625 &uap->sysmsg_result); 2626 } 2627 nlookup_done(&nd); 2628 return (error); 2629 } 2630 2631 static int 2632 setfflags(struct vnode *vp, int flags) 2633 { 2634 struct thread *td = curthread; 2635 struct proc *p = td->td_proc; 2636 int error; 2637 struct vattr vattr; 2638 2639 /* 2640 * Prevent non-root users from setting flags on devices. When 2641 * a device is reused, users can retain ownership of the device 2642 * if they are allowed to set flags and programs assume that 2643 * chown can't fail when done as root. 2644 */ 2645 if ((vp->v_type == VCHR || vp->v_type == VBLK) && 2646 ((error = priv_check_cred(p->p_ucred, PRIV_VFS_CHFLAGS_DEV, 0)) != 0)) 2647 return (error); 2648 2649 /* 2650 * note: vget is required for any operation that might mod the vnode 2651 * so VINACTIVE is properly cleared. 2652 */ 2653 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { 2654 VATTR_NULL(&vattr); 2655 vattr.va_flags = flags; 2656 error = VOP_SETATTR(vp, &vattr, p->p_ucred); 2657 vput(vp); 2658 } 2659 return (error); 2660 } 2661 2662 /* 2663 * chflags(char *path, int flags) 2664 * 2665 * Change flags of a file given a path name. 2666 */ 2667 /* ARGSUSED */ 2668 int 2669 sys_chflags(struct chflags_args *uap) 2670 { 2671 struct nlookupdata nd; 2672 struct vnode *vp; 2673 int error; 2674 2675 vp = NULL; 2676 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2677 if (error == 0) 2678 error = nlookup(&nd); 2679 if (error == 0) 2680 error = ncp_writechk(&nd.nl_nch); 2681 if (error == 0) 2682 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp); 2683 nlookup_done(&nd); 2684 if (error == 0) { 2685 error = setfflags(vp, uap->flags); 2686 vrele(vp); 2687 } 2688 return (error); 2689 } 2690 2691 /* 2692 * lchflags(char *path, int flags) 2693 * 2694 * Change flags of a file given a path name, but don't follow symlinks. 2695 */ 2696 /* ARGSUSED */ 2697 int 2698 sys_lchflags(struct lchflags_args *uap) 2699 { 2700 struct nlookupdata nd; 2701 struct vnode *vp; 2702 int error; 2703 2704 vp = NULL; 2705 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2706 if (error == 0) 2707 error = nlookup(&nd); 2708 if (error == 0) 2709 error = ncp_writechk(&nd.nl_nch); 2710 if (error == 0) 2711 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp); 2712 nlookup_done(&nd); 2713 if (error == 0) { 2714 error = setfflags(vp, uap->flags); 2715 vrele(vp); 2716 } 2717 return (error); 2718 } 2719 2720 /* 2721 * fchflags_args(int fd, int flags) 2722 * 2723 * Change flags of a file given a file descriptor. 2724 */ 2725 /* ARGSUSED */ 2726 int 2727 sys_fchflags(struct fchflags_args *uap) 2728 { 2729 struct thread *td = curthread; 2730 struct proc *p = td->td_proc; 2731 struct file *fp; 2732 int error; 2733 2734 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) 2735 return (error); 2736 if (fp->f_nchandle.ncp) 2737 error = ncp_writechk(&fp->f_nchandle); 2738 if (error == 0) 2739 error = setfflags((struct vnode *) fp->f_data, uap->flags); 2740 fdrop(fp); 2741 return (error); 2742 } 2743 2744 static int 2745 setfmode(struct vnode *vp, int mode) 2746 { 2747 struct thread *td = curthread; 2748 struct proc *p = td->td_proc; 2749 int error; 2750 struct vattr vattr; 2751 2752 /* 2753 * note: vget is required for any operation that might mod the vnode 2754 * so VINACTIVE is properly cleared. 2755 */ 2756 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { 2757 VATTR_NULL(&vattr); 2758 vattr.va_mode = mode & ALLPERMS; 2759 error = VOP_SETATTR(vp, &vattr, p->p_ucred); 2760 vput(vp); 2761 } 2762 return error; 2763 } 2764 2765 int 2766 kern_chmod(struct nlookupdata *nd, int mode) 2767 { 2768 struct vnode *vp; 2769 int error; 2770 2771 if ((error = nlookup(nd)) != 0) 2772 return (error); 2773 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0) 2774 return (error); 2775 if ((error = ncp_writechk(&nd->nl_nch)) == 0) 2776 error = setfmode(vp, mode); 2777 vrele(vp); 2778 return (error); 2779 } 2780 2781 /* 2782 * chmod_args(char *path, int mode) 2783 * 2784 * Change mode of a file given path name. 2785 */ 2786 /* ARGSUSED */ 2787 int 2788 sys_chmod(struct chmod_args *uap) 2789 { 2790 struct nlookupdata nd; 2791 int error; 2792 2793 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2794 if (error == 0) 2795 error = kern_chmod(&nd, uap->mode); 2796 nlookup_done(&nd); 2797 return (error); 2798 } 2799 2800 /* 2801 * lchmod_args(char *path, int mode) 2802 * 2803 * Change mode of a file given path name (don't follow links.) 2804 */ 2805 /* ARGSUSED */ 2806 int 2807 sys_lchmod(struct lchmod_args *uap) 2808 { 2809 struct nlookupdata nd; 2810 int error; 2811 2812 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2813 if (error == 0) 2814 error = kern_chmod(&nd, uap->mode); 2815 nlookup_done(&nd); 2816 return (error); 2817 } 2818 2819 /* 2820 * fchmod_args(int fd, int mode) 2821 * 2822 * Change mode of a file given a file descriptor. 2823 */ 2824 /* ARGSUSED */ 2825 int 2826 sys_fchmod(struct fchmod_args *uap) 2827 { 2828 struct thread *td = curthread; 2829 struct proc *p = td->td_proc; 2830 struct file *fp; 2831 int error; 2832 2833 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) 2834 return (error); 2835 if (fp->f_nchandle.ncp) 2836 error = ncp_writechk(&fp->f_nchandle); 2837 if (error == 0) 2838 error = setfmode((struct vnode *)fp->f_data, uap->mode); 2839 fdrop(fp); 2840 return (error); 2841 } 2842 2843 /* 2844 * fchmodat_args(char *path, int mode) 2845 * 2846 * Change mode of a file pointed to by fd/path. 2847 */ 2848 int 2849 sys_fchmodat(struct fchmodat_args *uap) 2850 { 2851 struct nlookupdata nd; 2852 struct file *fp; 2853 int error; 2854 int flags; 2855 2856 if (uap->flags & ~AT_SYMLINK_NOFOLLOW) 2857 return (EINVAL); 2858 flags = (uap->flags & AT_SYMLINK_NOFOLLOW) ? 0 : NLC_FOLLOW; 2859 2860 error = nlookup_init_at(&nd, &fp, uap->fd, uap->path, 2861 UIO_USERSPACE, flags); 2862 if (error == 0) 2863 error = kern_chmod(&nd, uap->mode); 2864 nlookup_done_at(&nd, fp); 2865 return (error); 2866 } 2867 2868 static int 2869 setfown(struct vnode *vp, uid_t uid, gid_t gid) 2870 { 2871 struct thread *td = curthread; 2872 struct proc *p = td->td_proc; 2873 int error; 2874 struct vattr vattr; 2875 2876 /* 2877 * note: vget is required for any operation that might mod the vnode 2878 * so VINACTIVE is properly cleared. 2879 */ 2880 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { 2881 VATTR_NULL(&vattr); 2882 vattr.va_uid = uid; 2883 vattr.va_gid = gid; 2884 error = VOP_SETATTR(vp, &vattr, p->p_ucred); 2885 vput(vp); 2886 } 2887 return error; 2888 } 2889 2890 int 2891 kern_chown(struct nlookupdata *nd, int uid, int gid) 2892 { 2893 struct vnode *vp; 2894 int error; 2895 2896 if ((error = nlookup(nd)) != 0) 2897 return (error); 2898 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0) 2899 return (error); 2900 if ((error = ncp_writechk(&nd->nl_nch)) == 0) 2901 error = setfown(vp, uid, gid); 2902 vrele(vp); 2903 return (error); 2904 } 2905 2906 /* 2907 * chown(char *path, int uid, int gid) 2908 * 2909 * Set ownership given a path name. 2910 */ 2911 int 2912 sys_chown(struct chown_args *uap) 2913 { 2914 struct nlookupdata nd; 2915 int error; 2916 2917 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2918 if (error == 0) 2919 error = kern_chown(&nd, uap->uid, uap->gid); 2920 nlookup_done(&nd); 2921 return (error); 2922 } 2923 2924 /* 2925 * lchown_args(char *path, int uid, int gid) 2926 * 2927 * Set ownership given a path name, do not cross symlinks. 2928 */ 2929 int 2930 sys_lchown(struct lchown_args *uap) 2931 { 2932 struct nlookupdata nd; 2933 int error; 2934 2935 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2936 if (error == 0) 2937 error = kern_chown(&nd, uap->uid, uap->gid); 2938 nlookup_done(&nd); 2939 return (error); 2940 } 2941 2942 /* 2943 * fchown_args(int fd, int uid, int gid) 2944 * 2945 * Set ownership given a file descriptor. 2946 */ 2947 /* ARGSUSED */ 2948 int 2949 sys_fchown(struct fchown_args *uap) 2950 { 2951 struct thread *td = curthread; 2952 struct proc *p = td->td_proc; 2953 struct file *fp; 2954 int error; 2955 2956 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) 2957 return (error); 2958 if (fp->f_nchandle.ncp) 2959 error = ncp_writechk(&fp->f_nchandle); 2960 if (error == 0) 2961 error = setfown((struct vnode *)fp->f_data, uap->uid, uap->gid); 2962 fdrop(fp); 2963 return (error); 2964 } 2965 2966 /* 2967 * fchownat(int fd, char *path, int uid, int gid, int flags) 2968 * 2969 * Set ownership of file pointed to by fd/path. 2970 */ 2971 int 2972 sys_fchownat(struct fchownat_args *uap) 2973 { 2974 struct nlookupdata nd; 2975 struct file *fp; 2976 int error; 2977 int flags; 2978 2979 if (uap->flags & ~AT_SYMLINK_NOFOLLOW) 2980 return (EINVAL); 2981 flags = (uap->flags & AT_SYMLINK_NOFOLLOW) ? 0 : NLC_FOLLOW; 2982 2983 error = nlookup_init_at(&nd, &fp, uap->fd, uap->path, 2984 UIO_USERSPACE, flags); 2985 if (error == 0) 2986 error = kern_chown(&nd, uap->uid, uap->gid); 2987 nlookup_done_at(&nd, fp); 2988 return (error); 2989 } 2990 2991 2992 static int 2993 getutimes(const struct timeval *tvp, struct timespec *tsp) 2994 { 2995 struct timeval tv[2]; 2996 2997 if (tvp == NULL) { 2998 microtime(&tv[0]); 2999 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); 3000 tsp[1] = tsp[0]; 3001 } else { 3002 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3003 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3004 } 3005 return 0; 3006 } 3007 3008 static int 3009 setutimes(struct vnode *vp, struct vattr *vattr, 3010 const struct timespec *ts, int nullflag) 3011 { 3012 struct thread *td = curthread; 3013 struct proc *p = td->td_proc; 3014 int error; 3015 3016 VATTR_NULL(vattr); 3017 vattr->va_atime = ts[0]; 3018 vattr->va_mtime = ts[1]; 3019 if (nullflag) 3020 vattr->va_vaflags |= VA_UTIMES_NULL; 3021 error = VOP_SETATTR(vp, vattr, p->p_ucred); 3022 3023 return error; 3024 } 3025 3026 int 3027 kern_utimes(struct nlookupdata *nd, struct timeval *tptr) 3028 { 3029 struct timespec ts[2]; 3030 struct vnode *vp; 3031 struct vattr vattr; 3032 int error; 3033 3034 if ((error = getutimes(tptr, ts)) != 0) 3035 return (error); 3036 3037 /* 3038 * NOTE: utimes() succeeds for the owner even if the file 3039 * is not user-writable. 3040 */ 3041 nd->nl_flags |= NLC_OWN | NLC_WRITE; 3042 3043 if ((error = nlookup(nd)) != 0) 3044 return (error); 3045 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 3046 return (error); 3047 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0) 3048 return (error); 3049 3050 /* 3051 * note: vget is required for any operation that might mod the vnode 3052 * so VINACTIVE is properly cleared. 3053 */ 3054 if ((error = vn_writechk(vp, &nd->nl_nch)) == 0) { 3055 error = vget(vp, LK_EXCLUSIVE); 3056 if (error == 0) { 3057 error = setutimes(vp, &vattr, ts, (tptr == NULL)); 3058 vput(vp); 3059 } 3060 } 3061 vrele(vp); 3062 return (error); 3063 } 3064 3065 /* 3066 * utimes_args(char *path, struct timeval *tptr) 3067 * 3068 * Set the access and modification times of a file. 3069 */ 3070 int 3071 sys_utimes(struct utimes_args *uap) 3072 { 3073 struct timeval tv[2]; 3074 struct nlookupdata nd; 3075 int error; 3076 3077 if (uap->tptr) { 3078 error = copyin(uap->tptr, tv, sizeof(tv)); 3079 if (error) 3080 return (error); 3081 } 3082 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3083 if (error == 0) 3084 error = kern_utimes(&nd, uap->tptr ? tv : NULL); 3085 nlookup_done(&nd); 3086 return (error); 3087 } 3088 3089 /* 3090 * lutimes_args(char *path, struct timeval *tptr) 3091 * 3092 * Set the access and modification times of a file. 3093 */ 3094 int 3095 sys_lutimes(struct lutimes_args *uap) 3096 { 3097 struct timeval tv[2]; 3098 struct nlookupdata nd; 3099 int error; 3100 3101 if (uap->tptr) { 3102 error = copyin(uap->tptr, tv, sizeof(tv)); 3103 if (error) 3104 return (error); 3105 } 3106 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 3107 if (error == 0) 3108 error = kern_utimes(&nd, uap->tptr ? tv : NULL); 3109 nlookup_done(&nd); 3110 return (error); 3111 } 3112 3113 /* 3114 * Set utimes on a file descriptor. The creds used to open the 3115 * file are used to determine whether the operation is allowed 3116 * or not. 3117 */ 3118 int 3119 kern_futimes(int fd, struct timeval *tptr) 3120 { 3121 struct thread *td = curthread; 3122 struct proc *p = td->td_proc; 3123 struct timespec ts[2]; 3124 struct file *fp; 3125 struct vnode *vp; 3126 struct vattr vattr; 3127 int error; 3128 3129 error = getutimes(tptr, ts); 3130 if (error) 3131 return (error); 3132 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 3133 return (error); 3134 if (fp->f_nchandle.ncp) 3135 error = ncp_writechk(&fp->f_nchandle); 3136 if (error == 0) { 3137 vp = fp->f_data; 3138 error = vget(vp, LK_EXCLUSIVE); 3139 if (error == 0) { 3140 error = VOP_GETATTR(vp, &vattr); 3141 if (error == 0) { 3142 error = naccess_va(&vattr, NLC_OWN | NLC_WRITE, 3143 fp->f_cred); 3144 } 3145 if (error == 0) { 3146 error = setutimes(vp, &vattr, ts, 3147 (tptr == NULL)); 3148 } 3149 vput(vp); 3150 } 3151 } 3152 fdrop(fp); 3153 return (error); 3154 } 3155 3156 /* 3157 * futimes_args(int fd, struct timeval *tptr) 3158 * 3159 * Set the access and modification times of a file. 3160 */ 3161 int 3162 sys_futimes(struct futimes_args *uap) 3163 { 3164 struct timeval tv[2]; 3165 int error; 3166 3167 if (uap->tptr) { 3168 error = copyin(uap->tptr, tv, sizeof(tv)); 3169 if (error) 3170 return (error); 3171 } 3172 3173 error = kern_futimes(uap->fd, uap->tptr ? tv : NULL); 3174 3175 return (error); 3176 } 3177 3178 int 3179 kern_truncate(struct nlookupdata *nd, off_t length) 3180 { 3181 struct vnode *vp; 3182 struct vattr vattr; 3183 int error; 3184 3185 if (length < 0) 3186 return(EINVAL); 3187 nd->nl_flags |= NLC_WRITE | NLC_TRUNCATE; 3188 if ((error = nlookup(nd)) != 0) 3189 return (error); 3190 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 3191 return (error); 3192 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0) 3193 return (error); 3194 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) { 3195 vrele(vp); 3196 return (error); 3197 } 3198 if (vp->v_type == VDIR) { 3199 error = EISDIR; 3200 } else if ((error = vn_writechk(vp, &nd->nl_nch)) == 0) { 3201 VATTR_NULL(&vattr); 3202 vattr.va_size = length; 3203 error = VOP_SETATTR(vp, &vattr, nd->nl_cred); 3204 } 3205 vput(vp); 3206 return (error); 3207 } 3208 3209 /* 3210 * truncate(char *path, int pad, off_t length) 3211 * 3212 * Truncate a file given its path name. 3213 */ 3214 int 3215 sys_truncate(struct truncate_args *uap) 3216 { 3217 struct nlookupdata nd; 3218 int error; 3219 3220 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3221 if (error == 0) 3222 error = kern_truncate(&nd, uap->length); 3223 nlookup_done(&nd); 3224 return error; 3225 } 3226 3227 int 3228 kern_ftruncate(int fd, off_t length) 3229 { 3230 struct thread *td = curthread; 3231 struct proc *p = td->td_proc; 3232 struct vattr vattr; 3233 struct vnode *vp; 3234 struct file *fp; 3235 int error; 3236 3237 if (length < 0) 3238 return(EINVAL); 3239 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 3240 return (error); 3241 if (fp->f_nchandle.ncp) { 3242 error = ncp_writechk(&fp->f_nchandle); 3243 if (error) 3244 goto done; 3245 } 3246 if ((fp->f_flag & FWRITE) == 0) { 3247 error = EINVAL; 3248 goto done; 3249 } 3250 if (fp->f_flag & FAPPENDONLY) { /* inode was set s/uapnd */ 3251 error = EINVAL; 3252 goto done; 3253 } 3254 vp = (struct vnode *)fp->f_data; 3255 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3256 if (vp->v_type == VDIR) { 3257 error = EISDIR; 3258 } else if ((error = vn_writechk(vp, NULL)) == 0) { 3259 VATTR_NULL(&vattr); 3260 vattr.va_size = length; 3261 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 3262 } 3263 vn_unlock(vp); 3264 done: 3265 fdrop(fp); 3266 return (error); 3267 } 3268 3269 /* 3270 * ftruncate_args(int fd, int pad, off_t length) 3271 * 3272 * Truncate a file given a file descriptor. 3273 */ 3274 int 3275 sys_ftruncate(struct ftruncate_args *uap) 3276 { 3277 int error; 3278 3279 error = kern_ftruncate(uap->fd, uap->length); 3280 3281 return (error); 3282 } 3283 3284 /* 3285 * fsync(int fd) 3286 * 3287 * Sync an open file. 3288 */ 3289 /* ARGSUSED */ 3290 int 3291 sys_fsync(struct fsync_args *uap) 3292 { 3293 struct thread *td = curthread; 3294 struct proc *p = td->td_proc; 3295 struct vnode *vp; 3296 struct file *fp; 3297 vm_object_t obj; 3298 int error; 3299 3300 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) 3301 return (error); 3302 vp = (struct vnode *)fp->f_data; 3303 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3304 if ((obj = vp->v_object) != NULL) 3305 vm_object_page_clean(obj, 0, 0, 0); 3306 error = VOP_FSYNC(vp, MNT_WAIT, VOP_FSYNC_SYSCALL); 3307 if (error == 0 && vp->v_mount) 3308 error = buf_fsync(vp); 3309 vn_unlock(vp); 3310 fdrop(fp); 3311 return (error); 3312 } 3313 3314 int 3315 kern_rename(struct nlookupdata *fromnd, struct nlookupdata *tond) 3316 { 3317 struct nchandle fnchd; 3318 struct nchandle tnchd; 3319 struct namecache *ncp; 3320 struct vnode *fdvp; 3321 struct vnode *tdvp; 3322 struct mount *mp; 3323 int error; 3324 3325 bwillinode(1); 3326 fromnd->nl_flags |= NLC_REFDVP | NLC_RENAME_SRC; 3327 if ((error = nlookup(fromnd)) != 0) 3328 return (error); 3329 if ((fnchd.ncp = fromnd->nl_nch.ncp->nc_parent) == NULL) 3330 return (ENOENT); 3331 fnchd.mount = fromnd->nl_nch.mount; 3332 cache_hold(&fnchd); 3333 3334 /* 3335 * unlock the source nch so we can lookup the target nch without 3336 * deadlocking. The target may or may not exist so we do not check 3337 * for a target vp like kern_mkdir() and other creation functions do. 3338 * 3339 * The source and target directories are ref'd and rechecked after 3340 * everything is relocked to determine if the source or target file 3341 * has been renamed. 3342 */ 3343 KKASSERT(fromnd->nl_flags & NLC_NCPISLOCKED); 3344 fromnd->nl_flags &= ~NLC_NCPISLOCKED; 3345 cache_unlock(&fromnd->nl_nch); 3346 3347 tond->nl_flags |= NLC_RENAME_DST | NLC_REFDVP; 3348 if ((error = nlookup(tond)) != 0) { 3349 cache_drop(&fnchd); 3350 return (error); 3351 } 3352 if ((tnchd.ncp = tond->nl_nch.ncp->nc_parent) == NULL) { 3353 cache_drop(&fnchd); 3354 return (ENOENT); 3355 } 3356 tnchd.mount = tond->nl_nch.mount; 3357 cache_hold(&tnchd); 3358 3359 /* 3360 * If the source and target are the same there is nothing to do 3361 */ 3362 if (fromnd->nl_nch.ncp == tond->nl_nch.ncp) { 3363 cache_drop(&fnchd); 3364 cache_drop(&tnchd); 3365 return (0); 3366 } 3367 3368 /* 3369 * Mount points cannot be renamed or overwritten 3370 */ 3371 if ((fromnd->nl_nch.ncp->nc_flag | tond->nl_nch.ncp->nc_flag) & 3372 NCF_ISMOUNTPT 3373 ) { 3374 cache_drop(&fnchd); 3375 cache_drop(&tnchd); 3376 return (EINVAL); 3377 } 3378 3379 /* 3380 * relock the source ncp. NOTE AFTER RELOCKING: the source ncp 3381 * may have become invalid while it was unlocked, nc_vp and nc_mount 3382 * could be NULL. 3383 */ 3384 if (cache_lock_nonblock(&fromnd->nl_nch) == 0) { 3385 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred); 3386 } else if (fromnd->nl_nch.ncp > tond->nl_nch.ncp) { 3387 cache_lock(&fromnd->nl_nch); 3388 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred); 3389 } else { 3390 cache_unlock(&tond->nl_nch); 3391 cache_lock(&fromnd->nl_nch); 3392 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred); 3393 cache_lock(&tond->nl_nch); 3394 cache_resolve(&tond->nl_nch, tond->nl_cred); 3395 } 3396 fromnd->nl_flags |= NLC_NCPISLOCKED; 3397 3398 /* 3399 * make sure the parent directories linkages are the same 3400 */ 3401 if (fnchd.ncp != fromnd->nl_nch.ncp->nc_parent || 3402 tnchd.ncp != tond->nl_nch.ncp->nc_parent) { 3403 cache_drop(&fnchd); 3404 cache_drop(&tnchd); 3405 return (ENOENT); 3406 } 3407 3408 /* 3409 * Both the source and target must be within the same filesystem and 3410 * in the same filesystem as their parent directories within the 3411 * namecache topology. 3412 * 3413 * NOTE: fromnd's nc_mount or nc_vp could be NULL. 3414 */ 3415 mp = fnchd.mount; 3416 if (mp != tnchd.mount || mp != fromnd->nl_nch.mount || 3417 mp != tond->nl_nch.mount) { 3418 cache_drop(&fnchd); 3419 cache_drop(&tnchd); 3420 return (EXDEV); 3421 } 3422 3423 /* 3424 * Make sure the mount point is writable 3425 */ 3426 if ((error = ncp_writechk(&tond->nl_nch)) != 0) { 3427 cache_drop(&fnchd); 3428 cache_drop(&tnchd); 3429 return (error); 3430 } 3431 3432 /* 3433 * If the target exists and either the source or target is a directory, 3434 * then both must be directories. 3435 * 3436 * Due to relocking of the source, fromnd->nl_nch.ncp->nc_vp might h 3437 * have become NULL. 3438 */ 3439 if (tond->nl_nch.ncp->nc_vp) { 3440 if (fromnd->nl_nch.ncp->nc_vp == NULL) { 3441 error = ENOENT; 3442 } else if (fromnd->nl_nch.ncp->nc_vp->v_type == VDIR) { 3443 if (tond->nl_nch.ncp->nc_vp->v_type != VDIR) 3444 error = ENOTDIR; 3445 } else if (tond->nl_nch.ncp->nc_vp->v_type == VDIR) { 3446 error = EISDIR; 3447 } 3448 } 3449 3450 /* 3451 * You cannot rename a source into itself or a subdirectory of itself. 3452 * We check this by travsersing the target directory upwards looking 3453 * for a match against the source. 3454 */ 3455 if (error == 0) { 3456 for (ncp = tnchd.ncp; ncp; ncp = ncp->nc_parent) { 3457 if (fromnd->nl_nch.ncp == ncp) { 3458 error = EINVAL; 3459 break; 3460 } 3461 } 3462 } 3463 3464 cache_drop(&fnchd); 3465 cache_drop(&tnchd); 3466 3467 /* 3468 * Even though the namespaces are different, they may still represent 3469 * hardlinks to the same file. The filesystem might have a hard time 3470 * with this so we issue a NREMOVE of the source instead of a NRENAME 3471 * when we detect the situation. 3472 */ 3473 if (error == 0) { 3474 fdvp = fromnd->nl_dvp; 3475 tdvp = tond->nl_dvp; 3476 if (fdvp == NULL || tdvp == NULL) { 3477 error = EPERM; 3478 } else if (fromnd->nl_nch.ncp->nc_vp == tond->nl_nch.ncp->nc_vp) { 3479 error = VOP_NREMOVE(&fromnd->nl_nch, fdvp, 3480 fromnd->nl_cred); 3481 } else { 3482 error = VOP_NRENAME(&fromnd->nl_nch, &tond->nl_nch, 3483 fdvp, tdvp, tond->nl_cred); 3484 } 3485 } 3486 return (error); 3487 } 3488 3489 /* 3490 * rename_args(char *from, char *to) 3491 * 3492 * Rename files. Source and destination must either both be directories, 3493 * or both not be directories. If target is a directory, it must be empty. 3494 */ 3495 int 3496 sys_rename(struct rename_args *uap) 3497 { 3498 struct nlookupdata fromnd, tond; 3499 int error; 3500 3501 error = nlookup_init(&fromnd, uap->from, UIO_USERSPACE, 0); 3502 if (error == 0) { 3503 error = nlookup_init(&tond, uap->to, UIO_USERSPACE, 0); 3504 if (error == 0) 3505 error = kern_rename(&fromnd, &tond); 3506 nlookup_done(&tond); 3507 } 3508 nlookup_done(&fromnd); 3509 return (error); 3510 } 3511 3512 int 3513 kern_mkdir(struct nlookupdata *nd, int mode) 3514 { 3515 struct thread *td = curthread; 3516 struct proc *p = td->td_proc; 3517 struct vnode *vp; 3518 struct vattr vattr; 3519 int error; 3520 3521 bwillinode(1); 3522 nd->nl_flags |= NLC_WILLBEDIR | NLC_CREATE | NLC_REFDVP; 3523 if ((error = nlookup(nd)) != 0) 3524 return (error); 3525 3526 if (nd->nl_nch.ncp->nc_vp) 3527 return (EEXIST); 3528 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 3529 return (error); 3530 VATTR_NULL(&vattr); 3531 vattr.va_type = VDIR; 3532 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask; 3533 3534 vp = NULL; 3535 error = VOP_NMKDIR(&nd->nl_nch, nd->nl_dvp, &vp, p->p_ucred, &vattr); 3536 if (error == 0) 3537 vput(vp); 3538 return (error); 3539 } 3540 3541 /* 3542 * mkdir_args(char *path, int mode) 3543 * 3544 * Make a directory file. 3545 */ 3546 /* ARGSUSED */ 3547 int 3548 sys_mkdir(struct mkdir_args *uap) 3549 { 3550 struct nlookupdata nd; 3551 int error; 3552 3553 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 3554 if (error == 0) 3555 error = kern_mkdir(&nd, uap->mode); 3556 nlookup_done(&nd); 3557 return (error); 3558 } 3559 3560 int 3561 kern_rmdir(struct nlookupdata *nd) 3562 { 3563 int error; 3564 3565 bwillinode(1); 3566 nd->nl_flags |= NLC_DELETE | NLC_REFDVP; 3567 if ((error = nlookup(nd)) != 0) 3568 return (error); 3569 3570 /* 3571 * Do not allow directories representing mount points to be 3572 * deleted, even if empty. Check write perms on mount point 3573 * in case the vnode is aliased (aka nullfs). 3574 */ 3575 if (nd->nl_nch.ncp->nc_flag & (NCF_ISMOUNTPT)) 3576 return (EINVAL); 3577 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 3578 return (error); 3579 error = VOP_NRMDIR(&nd->nl_nch, nd->nl_dvp, nd->nl_cred); 3580 return (error); 3581 } 3582 3583 /* 3584 * rmdir_args(char *path) 3585 * 3586 * Remove a directory file. 3587 */ 3588 /* ARGSUSED */ 3589 int 3590 sys_rmdir(struct rmdir_args *uap) 3591 { 3592 struct nlookupdata nd; 3593 int error; 3594 3595 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 3596 if (error == 0) 3597 error = kern_rmdir(&nd); 3598 nlookup_done(&nd); 3599 return (error); 3600 } 3601 3602 int 3603 kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res, 3604 enum uio_seg direction) 3605 { 3606 struct thread *td = curthread; 3607 struct proc *p = td->td_proc; 3608 struct vnode *vp; 3609 struct file *fp; 3610 struct uio auio; 3611 struct iovec aiov; 3612 off_t loff; 3613 int error, eofflag; 3614 3615 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 3616 return (error); 3617 if ((fp->f_flag & FREAD) == 0) { 3618 error = EBADF; 3619 goto done; 3620 } 3621 vp = (struct vnode *)fp->f_data; 3622 unionread: 3623 if (vp->v_type != VDIR) { 3624 error = EINVAL; 3625 goto done; 3626 } 3627 aiov.iov_base = buf; 3628 aiov.iov_len = count; 3629 auio.uio_iov = &aiov; 3630 auio.uio_iovcnt = 1; 3631 auio.uio_rw = UIO_READ; 3632 auio.uio_segflg = direction; 3633 auio.uio_td = td; 3634 auio.uio_resid = count; 3635 loff = auio.uio_offset = fp->f_offset; 3636 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); 3637 fp->f_offset = auio.uio_offset; 3638 if (error) 3639 goto done; 3640 if (count == auio.uio_resid) { 3641 if (union_dircheckp) { 3642 error = union_dircheckp(td, &vp, fp); 3643 if (error == -1) 3644 goto unionread; 3645 if (error) 3646 goto done; 3647 } 3648 #if 0 3649 if ((vp->v_flag & VROOT) && 3650 (vp->v_mount->mnt_flag & MNT_UNION)) { 3651 struct vnode *tvp = vp; 3652 vp = vp->v_mount->mnt_vnodecovered; 3653 vref(vp); 3654 fp->f_data = vp; 3655 fp->f_offset = 0; 3656 vrele(tvp); 3657 goto unionread; 3658 } 3659 #endif 3660 } 3661 3662 /* 3663 * WARNING! *basep may not be wide enough to accomodate the 3664 * seek offset. XXX should we hack this to return the upper 32 bits 3665 * for offsets greater then 4G? 3666 */ 3667 if (basep) { 3668 *basep = (long)loff; 3669 } 3670 *res = count - auio.uio_resid; 3671 done: 3672 fdrop(fp); 3673 return (error); 3674 } 3675 3676 /* 3677 * getdirentries_args(int fd, char *buf, u_int conut, long *basep) 3678 * 3679 * Read a block of directory entries in a file system independent format. 3680 */ 3681 int 3682 sys_getdirentries(struct getdirentries_args *uap) 3683 { 3684 long base; 3685 int error; 3686 3687 error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base, 3688 &uap->sysmsg_result, UIO_USERSPACE); 3689 3690 if (error == 0 && uap->basep) 3691 error = copyout(&base, uap->basep, sizeof(*uap->basep)); 3692 return (error); 3693 } 3694 3695 /* 3696 * getdents_args(int fd, char *buf, size_t count) 3697 */ 3698 int 3699 sys_getdents(struct getdents_args *uap) 3700 { 3701 int error; 3702 3703 error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL, 3704 &uap->sysmsg_result, UIO_USERSPACE); 3705 3706 return (error); 3707 } 3708 3709 /* 3710 * umask(int newmask) 3711 * 3712 * Set the mode mask for creation of filesystem nodes. 3713 * 3714 * MP SAFE 3715 */ 3716 int 3717 sys_umask(struct umask_args *uap) 3718 { 3719 struct thread *td = curthread; 3720 struct proc *p = td->td_proc; 3721 struct filedesc *fdp; 3722 3723 fdp = p->p_fd; 3724 uap->sysmsg_result = fdp->fd_cmask; 3725 fdp->fd_cmask = uap->newmask & ALLPERMS; 3726 return (0); 3727 } 3728 3729 /* 3730 * revoke(char *path) 3731 * 3732 * Void all references to file by ripping underlying filesystem 3733 * away from vnode. 3734 */ 3735 /* ARGSUSED */ 3736 int 3737 sys_revoke(struct revoke_args *uap) 3738 { 3739 struct nlookupdata nd; 3740 struct vattr vattr; 3741 struct vnode *vp; 3742 struct ucred *cred; 3743 int error; 3744 3745 vp = NULL; 3746 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3747 if (error == 0) 3748 error = nlookup(&nd); 3749 if (error == 0) 3750 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp); 3751 cred = crhold(nd.nl_cred); 3752 nlookup_done(&nd); 3753 if (error == 0) { 3754 if (error == 0) 3755 error = VOP_GETATTR(vp, &vattr); 3756 if (error == 0 && cred->cr_uid != vattr.va_uid) 3757 error = priv_check_cred(cred, PRIV_VFS_REVOKE, 0); 3758 if (error == 0 && (vp->v_type == VCHR || vp->v_type == VBLK)) { 3759 if (vcount(vp) > 0) 3760 error = vrevoke(vp, cred); 3761 } else if (error == 0) { 3762 error = vrevoke(vp, cred); 3763 } 3764 vrele(vp); 3765 } 3766 if (cred) 3767 crfree(cred); 3768 return (error); 3769 } 3770 3771 /* 3772 * getfh_args(char *fname, fhandle_t *fhp) 3773 * 3774 * Get (NFS) file handle 3775 * 3776 * NOTE: We use the fsid of the covering mount, even if it is a nullfs 3777 * mount. This allows nullfs mounts to be explicitly exported. 3778 * 3779 * WARNING: nullfs mounts of HAMMER PFS ROOTs are safe. 3780 * 3781 * nullfs mounts of subdirectories are not safe. That is, it will 3782 * work, but you do not really have protection against access to 3783 * the related parent directories. 3784 */ 3785 int 3786 sys_getfh(struct getfh_args *uap) 3787 { 3788 struct thread *td = curthread; 3789 struct nlookupdata nd; 3790 fhandle_t fh; 3791 struct vnode *vp; 3792 struct mount *mp; 3793 int error; 3794 3795 /* 3796 * Must be super user 3797 */ 3798 if ((error = priv_check(td, PRIV_ROOT)) != 0) 3799 return (error); 3800 3801 vp = NULL; 3802 error = nlookup_init(&nd, uap->fname, UIO_USERSPACE, NLC_FOLLOW); 3803 if (error == 0) 3804 error = nlookup(&nd); 3805 if (error == 0) 3806 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 3807 mp = nd.nl_nch.mount; 3808 nlookup_done(&nd); 3809 if (error == 0) { 3810 bzero(&fh, sizeof(fh)); 3811 fh.fh_fsid = mp->mnt_stat.f_fsid; 3812 error = VFS_VPTOFH(vp, &fh.fh_fid); 3813 vput(vp); 3814 if (error == 0) 3815 error = copyout(&fh, uap->fhp, sizeof(fh)); 3816 } 3817 return (error); 3818 } 3819 3820 /* 3821 * fhopen_args(const struct fhandle *u_fhp, int flags) 3822 * 3823 * syscall for the rpc.lockd to use to translate a NFS file handle into 3824 * an open descriptor. 3825 * 3826 * warning: do not remove the priv_check() call or this becomes one giant 3827 * security hole. 3828 */ 3829 int 3830 sys_fhopen(struct fhopen_args *uap) 3831 { 3832 struct thread *td = curthread; 3833 struct proc *p = td->td_proc; 3834 struct mount *mp; 3835 struct vnode *vp; 3836 struct fhandle fhp; 3837 struct vattr vat; 3838 struct vattr *vap = &vat; 3839 struct flock lf; 3840 int fmode, mode, error, type; 3841 struct file *nfp; 3842 struct file *fp; 3843 int indx; 3844 3845 /* 3846 * Must be super user 3847 */ 3848 error = priv_check(td, PRIV_ROOT); 3849 if (error) 3850 return (error); 3851 3852 fmode = FFLAGS(uap->flags); 3853 /* why not allow a non-read/write open for our lockd? */ 3854 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 3855 return (EINVAL); 3856 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 3857 if (error) 3858 return(error); 3859 /* find the mount point */ 3860 mp = vfs_getvfs(&fhp.fh_fsid); 3861 if (mp == NULL) 3862 return (ESTALE); 3863 /* now give me my vnode, it gets returned to me locked */ 3864 error = VFS_FHTOVP(mp, NULL, &fhp.fh_fid, &vp); 3865 if (error) 3866 return (error); 3867 /* 3868 * from now on we have to make sure not 3869 * to forget about the vnode 3870 * any error that causes an abort must vput(vp) 3871 * just set error = err and 'goto bad;'. 3872 */ 3873 3874 /* 3875 * from vn_open 3876 */ 3877 if (vp->v_type == VLNK) { 3878 error = EMLINK; 3879 goto bad; 3880 } 3881 if (vp->v_type == VSOCK) { 3882 error = EOPNOTSUPP; 3883 goto bad; 3884 } 3885 mode = 0; 3886 if (fmode & (FWRITE | O_TRUNC)) { 3887 if (vp->v_type == VDIR) { 3888 error = EISDIR; 3889 goto bad; 3890 } 3891 error = vn_writechk(vp, NULL); 3892 if (error) 3893 goto bad; 3894 mode |= VWRITE; 3895 } 3896 if (fmode & FREAD) 3897 mode |= VREAD; 3898 if (mode) { 3899 error = VOP_ACCESS(vp, mode, p->p_ucred); 3900 if (error) 3901 goto bad; 3902 } 3903 if (fmode & O_TRUNC) { 3904 vn_unlock(vp); /* XXX */ 3905 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 3906 VATTR_NULL(vap); 3907 vap->va_size = 0; 3908 error = VOP_SETATTR(vp, vap, p->p_ucred); 3909 if (error) 3910 goto bad; 3911 } 3912 3913 /* 3914 * VOP_OPEN needs the file pointer so it can potentially override 3915 * it. 3916 * 3917 * WARNING! no f_nchandle will be associated when fhopen()ing a 3918 * directory. XXX 3919 */ 3920 if ((error = falloc(p, &nfp, &indx)) != 0) 3921 goto bad; 3922 fp = nfp; 3923 3924 error = VOP_OPEN(vp, fmode, p->p_ucred, fp); 3925 if (error) { 3926 /* 3927 * setting f_ops this way prevents VOP_CLOSE from being 3928 * called or fdrop() releasing the vp from v_data. Since 3929 * the VOP_OPEN failed we don't want to VOP_CLOSE. 3930 */ 3931 fp->f_ops = &badfileops; 3932 fp->f_data = NULL; 3933 goto bad_drop; 3934 } 3935 3936 /* 3937 * The fp is given its own reference, we still have our ref and lock. 3938 * 3939 * Assert that all regular files must be created with a VM object. 3940 */ 3941 if (vp->v_type == VREG && vp->v_object == NULL) { 3942 kprintf("fhopen: regular file did not have VM object: %p\n", vp); 3943 goto bad_drop; 3944 } 3945 3946 /* 3947 * The open was successful. Handle any locking requirements. 3948 */ 3949 if (fmode & (O_EXLOCK | O_SHLOCK)) { 3950 lf.l_whence = SEEK_SET; 3951 lf.l_start = 0; 3952 lf.l_len = 0; 3953 if (fmode & O_EXLOCK) 3954 lf.l_type = F_WRLCK; 3955 else 3956 lf.l_type = F_RDLCK; 3957 if (fmode & FNONBLOCK) 3958 type = 0; 3959 else 3960 type = F_WAIT; 3961 vn_unlock(vp); 3962 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { 3963 /* 3964 * release our private reference. 3965 */ 3966 fsetfd(p, NULL, indx); 3967 fdrop(fp); 3968 vrele(vp); 3969 return (error); 3970 } 3971 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3972 fp->f_flag |= FHASLOCK; 3973 } 3974 3975 /* 3976 * Clean up. Associate the file pointer with the previously 3977 * reserved descriptor and return it. 3978 */ 3979 vput(vp); 3980 fsetfd(p, fp, indx); 3981 fdrop(fp); 3982 uap->sysmsg_result = indx; 3983 return (0); 3984 3985 bad_drop: 3986 fsetfd(p, NULL, indx); 3987 fdrop(fp); 3988 bad: 3989 vput(vp); 3990 return (error); 3991 } 3992 3993 /* 3994 * fhstat_args(struct fhandle *u_fhp, struct stat *sb) 3995 */ 3996 int 3997 sys_fhstat(struct fhstat_args *uap) 3998 { 3999 struct thread *td = curthread; 4000 struct stat sb; 4001 fhandle_t fh; 4002 struct mount *mp; 4003 struct vnode *vp; 4004 int error; 4005 4006 /* 4007 * Must be super user 4008 */ 4009 error = priv_check(td, PRIV_ROOT); 4010 if (error) 4011 return (error); 4012 4013 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4014 if (error) 4015 return (error); 4016 4017 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 4018 return (ESTALE); 4019 if ((error = VFS_FHTOVP(mp, NULL, &fh.fh_fid, &vp))) 4020 return (error); 4021 error = vn_stat(vp, &sb, td->td_proc->p_ucred); 4022 vput(vp); 4023 if (error) 4024 return (error); 4025 error = copyout(&sb, uap->sb, sizeof(sb)); 4026 return (error); 4027 } 4028 4029 /* 4030 * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf) 4031 */ 4032 int 4033 sys_fhstatfs(struct fhstatfs_args *uap) 4034 { 4035 struct thread *td = curthread; 4036 struct proc *p = td->td_proc; 4037 struct statfs *sp; 4038 struct mount *mp; 4039 struct vnode *vp; 4040 struct statfs sb; 4041 char *fullpath, *freepath; 4042 fhandle_t fh; 4043 int error; 4044 4045 /* 4046 * Must be super user 4047 */ 4048 if ((error = priv_check(td, PRIV_ROOT))) 4049 return (error); 4050 4051 if ((error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t))) != 0) 4052 return (error); 4053 4054 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 4055 return (ESTALE); 4056 4057 if (p != NULL && !chroot_visible_mnt(mp, p)) 4058 return (ESTALE); 4059 4060 if ((error = VFS_FHTOVP(mp, NULL, &fh.fh_fid, &vp))) 4061 return (error); 4062 mp = vp->v_mount; 4063 sp = &mp->mnt_stat; 4064 vput(vp); 4065 if ((error = VFS_STATFS(mp, sp, p->p_ucred)) != 0) 4066 return (error); 4067 4068 error = mount_path(p, mp, &fullpath, &freepath); 4069 if (error) 4070 return(error); 4071 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 4072 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 4073 kfree(freepath, M_TEMP); 4074 4075 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 4076 if (priv_check(td, PRIV_ROOT)) { 4077 bcopy(sp, &sb, sizeof(sb)); 4078 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 4079 sp = &sb; 4080 } 4081 return (copyout(sp, uap->buf, sizeof(*sp))); 4082 } 4083 4084 /* 4085 * fhstatvfs_args(struct fhandle *u_fhp, struct statvfs *buf) 4086 */ 4087 int 4088 sys_fhstatvfs(struct fhstatvfs_args *uap) 4089 { 4090 struct thread *td = curthread; 4091 struct proc *p = td->td_proc; 4092 struct statvfs *sp; 4093 struct mount *mp; 4094 struct vnode *vp; 4095 fhandle_t fh; 4096 int error; 4097 4098 /* 4099 * Must be super user 4100 */ 4101 if ((error = priv_check(td, PRIV_ROOT))) 4102 return (error); 4103 4104 if ((error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t))) != 0) 4105 return (error); 4106 4107 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 4108 return (ESTALE); 4109 4110 if (p != NULL && !chroot_visible_mnt(mp, p)) 4111 return (ESTALE); 4112 4113 if ((error = VFS_FHTOVP(mp, NULL, &fh.fh_fid, &vp))) 4114 return (error); 4115 mp = vp->v_mount; 4116 sp = &mp->mnt_vstat; 4117 vput(vp); 4118 if ((error = VFS_STATVFS(mp, sp, p->p_ucred)) != 0) 4119 return (error); 4120 4121 sp->f_flag = 0; 4122 if (mp->mnt_flag & MNT_RDONLY) 4123 sp->f_flag |= ST_RDONLY; 4124 if (mp->mnt_flag & MNT_NOSUID) 4125 sp->f_flag |= ST_NOSUID; 4126 4127 return (copyout(sp, uap->buf, sizeof(*sp))); 4128 } 4129 4130 4131 /* 4132 * Syscall to push extended attribute configuration information into the 4133 * VFS. Accepts a path, which it converts to a mountpoint, as well as 4134 * a command (int cmd), and attribute name and misc data. For now, the 4135 * attribute name is left in userspace for consumption by the VFS_op. 4136 * It will probably be changed to be copied into sysspace by the 4137 * syscall in the future, once issues with various consumers of the 4138 * attribute code have raised their hands. 4139 * 4140 * Currently this is used only by UFS Extended Attributes. 4141 */ 4142 int 4143 sys_extattrctl(struct extattrctl_args *uap) 4144 { 4145 struct nlookupdata nd; 4146 struct mount *mp; 4147 struct vnode *vp; 4148 int error; 4149 4150 vp = NULL; 4151 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 4152 if (error == 0) 4153 error = nlookup(&nd); 4154 if (error == 0) { 4155 mp = nd.nl_nch.mount; 4156 error = VFS_EXTATTRCTL(mp, uap->cmd, 4157 uap->attrname, uap->arg, 4158 nd.nl_cred); 4159 } 4160 nlookup_done(&nd); 4161 return (error); 4162 } 4163 4164 /* 4165 * Syscall to set a named extended attribute on a file or directory. 4166 * Accepts attribute name, and a uio structure pointing to the data to set. 4167 * The uio is consumed in the style of writev(). The real work happens 4168 * in VOP_SETEXTATTR(). 4169 */ 4170 int 4171 sys_extattr_set_file(struct extattr_set_file_args *uap) 4172 { 4173 char attrname[EXTATTR_MAXNAMELEN]; 4174 struct iovec aiov[UIO_SMALLIOV]; 4175 struct iovec *needfree; 4176 struct nlookupdata nd; 4177 struct iovec *iov; 4178 struct vnode *vp; 4179 struct uio auio; 4180 u_int iovlen; 4181 u_int cnt; 4182 int error; 4183 int i; 4184 4185 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); 4186 if (error) 4187 return (error); 4188 4189 vp = NULL; 4190 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 4191 if (error == 0) 4192 error = nlookup(&nd); 4193 if (error == 0) 4194 error = ncp_writechk(&nd.nl_nch); 4195 if (error == 0) 4196 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 4197 if (error) { 4198 nlookup_done(&nd); 4199 return (error); 4200 } 4201 4202 needfree = NULL; 4203 iovlen = uap->iovcnt * sizeof(struct iovec); 4204 if (uap->iovcnt > UIO_SMALLIOV) { 4205 if (uap->iovcnt > UIO_MAXIOV) { 4206 error = EINVAL; 4207 goto done; 4208 } 4209 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 4210 needfree = iov; 4211 } else { 4212 iov = aiov; 4213 } 4214 auio.uio_iov = iov; 4215 auio.uio_iovcnt = uap->iovcnt; 4216 auio.uio_rw = UIO_WRITE; 4217 auio.uio_segflg = UIO_USERSPACE; 4218 auio.uio_td = nd.nl_td; 4219 auio.uio_offset = 0; 4220 if ((error = copyin(uap->iovp, iov, iovlen))) 4221 goto done; 4222 auio.uio_resid = 0; 4223 for (i = 0; i < uap->iovcnt; i++) { 4224 if (iov->iov_len > LONG_MAX - auio.uio_resid) { 4225 error = EINVAL; 4226 goto done; 4227 } 4228 auio.uio_resid += iov->iov_len; 4229 iov++; 4230 } 4231 cnt = auio.uio_resid; 4232 error = VOP_SETEXTATTR(vp, attrname, &auio, nd.nl_cred); 4233 cnt -= auio.uio_resid; 4234 uap->sysmsg_result = cnt; 4235 done: 4236 vput(vp); 4237 nlookup_done(&nd); 4238 if (needfree) 4239 FREE(needfree, M_IOV); 4240 return (error); 4241 } 4242 4243 /* 4244 * Syscall to get a named extended attribute on a file or directory. 4245 * Accepts attribute name, and a uio structure pointing to a buffer for the 4246 * data. The uio is consumed in the style of readv(). The real work 4247 * happens in VOP_GETEXTATTR(); 4248 */ 4249 int 4250 sys_extattr_get_file(struct extattr_get_file_args *uap) 4251 { 4252 char attrname[EXTATTR_MAXNAMELEN]; 4253 struct iovec aiov[UIO_SMALLIOV]; 4254 struct iovec *needfree; 4255 struct nlookupdata nd; 4256 struct iovec *iov; 4257 struct vnode *vp; 4258 struct uio auio; 4259 u_int iovlen; 4260 u_int cnt; 4261 int error; 4262 int i; 4263 4264 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); 4265 if (error) 4266 return (error); 4267 4268 vp = NULL; 4269 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 4270 if (error == 0) 4271 error = nlookup(&nd); 4272 if (error == 0) 4273 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 4274 if (error) { 4275 nlookup_done(&nd); 4276 return (error); 4277 } 4278 4279 iovlen = uap->iovcnt * sizeof (struct iovec); 4280 needfree = NULL; 4281 if (uap->iovcnt > UIO_SMALLIOV) { 4282 if (uap->iovcnt > UIO_MAXIOV) { 4283 error = EINVAL; 4284 goto done; 4285 } 4286 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 4287 needfree = iov; 4288 } else { 4289 iov = aiov; 4290 } 4291 auio.uio_iov = iov; 4292 auio.uio_iovcnt = uap->iovcnt; 4293 auio.uio_rw = UIO_READ; 4294 auio.uio_segflg = UIO_USERSPACE; 4295 auio.uio_td = nd.nl_td; 4296 auio.uio_offset = 0; 4297 if ((error = copyin(uap->iovp, iov, iovlen))) 4298 goto done; 4299 auio.uio_resid = 0; 4300 for (i = 0; i < uap->iovcnt; i++) { 4301 if (iov->iov_len > LONG_MAX - auio.uio_resid) { 4302 error = EINVAL; 4303 goto done; 4304 } 4305 auio.uio_resid += iov->iov_len; 4306 iov++; 4307 } 4308 cnt = auio.uio_resid; 4309 error = VOP_GETEXTATTR(vp, attrname, &auio, nd.nl_cred); 4310 cnt -= auio.uio_resid; 4311 uap->sysmsg_result = cnt; 4312 done: 4313 vput(vp); 4314 nlookup_done(&nd); 4315 if (needfree) 4316 FREE(needfree, M_IOV); 4317 return(error); 4318 } 4319 4320 /* 4321 * Syscall to delete a named extended attribute from a file or directory. 4322 * Accepts attribute name. The real work happens in VOP_SETEXTATTR(). 4323 */ 4324 int 4325 sys_extattr_delete_file(struct extattr_delete_file_args *uap) 4326 { 4327 char attrname[EXTATTR_MAXNAMELEN]; 4328 struct nlookupdata nd; 4329 struct vnode *vp; 4330 int error; 4331 4332 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); 4333 if (error) 4334 return(error); 4335 4336 vp = NULL; 4337 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 4338 if (error == 0) 4339 error = nlookup(&nd); 4340 if (error == 0) 4341 error = ncp_writechk(&nd.nl_nch); 4342 if (error == 0) 4343 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 4344 if (error) { 4345 nlookup_done(&nd); 4346 return (error); 4347 } 4348 4349 error = VOP_SETEXTATTR(vp, attrname, NULL, nd.nl_cred); 4350 vput(vp); 4351 nlookup_done(&nd); 4352 return(error); 4353 } 4354 4355 /* 4356 * Determine if the mount is visible to the process. 4357 */ 4358 static int 4359 chroot_visible_mnt(struct mount *mp, struct proc *p) 4360 { 4361 struct nchandle nch; 4362 4363 /* 4364 * Traverse from the mount point upwards. If we hit the process 4365 * root then the mount point is visible to the process. 4366 */ 4367 nch = mp->mnt_ncmountpt; 4368 while (nch.ncp) { 4369 if (nch.mount == p->p_fd->fd_nrdir.mount && 4370 nch.ncp == p->p_fd->fd_nrdir.ncp) { 4371 return(1); 4372 } 4373 if (nch.ncp == nch.mount->mnt_ncmountpt.ncp) { 4374 nch = nch.mount->mnt_ncmounton; 4375 } else { 4376 nch.ncp = nch.ncp->nc_parent; 4377 } 4378 } 4379 4380 /* 4381 * If the mount point is not visible to the process, but the 4382 * process root is in a subdirectory of the mount, return 4383 * TRUE anyway. 4384 */ 4385 if (p->p_fd->fd_nrdir.mount == mp) 4386 return(1); 4387 4388 return(0); 4389 } 4390 4391