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); 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 ((error = priv_check(td, PRIV_ROOT)) != 0) 912 return (error); 913 914 /* 915 * Argument length checks 916 */ 917 if (uap->ctllen < 0 || uap->ctllen > 1024) 918 return (EINVAL); 919 if (uap->buflen < 0 || uap->buflen > 16 * 1024) 920 return (EINVAL); 921 if (uap->path == NULL) 922 return (EINVAL); 923 924 /* 925 * Allocate the necessary buffers and copyin data 926 */ 927 path = objcache_get(namei_oc, M_WAITOK); 928 error = copyinstr(uap->path, path, MAXPATHLEN, NULL); 929 if (error) 930 goto done; 931 932 if (uap->ctllen) { 933 ctl = kmalloc(uap->ctllen + 1, M_TEMP, M_WAITOK|M_ZERO); 934 error = copyin(uap->ctl, ctl, uap->ctllen); 935 if (error) 936 goto done; 937 } 938 if (uap->buflen) 939 buf = kmalloc(uap->buflen + 1, M_TEMP, M_WAITOK|M_ZERO); 940 941 /* 942 * Validate the descriptor 943 */ 944 if (uap->fd >= 0) { 945 fp = holdfp(p->p_fd, uap->fd, -1); 946 if (fp == NULL) { 947 error = EBADF; 948 goto done; 949 } 950 } else { 951 fp = NULL; 952 } 953 954 /* 955 * Execute the internal kernel function and clean up. 956 */ 957 error = kern_mountctl(path, uap->op, fp, ctl, uap->ctllen, buf, uap->buflen, &uap->sysmsg_result); 958 if (fp) 959 fdrop(fp); 960 if (error == 0 && uap->sysmsg_result > 0) 961 error = copyout(buf, uap->buf, uap->sysmsg_result); 962 done: 963 if (path) 964 objcache_put(namei_oc, path); 965 if (ctl) 966 kfree(ctl, M_TEMP); 967 if (buf) 968 kfree(buf, M_TEMP); 969 return (error); 970 } 971 972 /* 973 * Execute a mount control operation by resolving the path to a mount point 974 * and calling vop_mountctl(). 975 * 976 * Use the mount point from the nch instead of the vnode so nullfs mounts 977 * can properly spike the VOP. 978 */ 979 int 980 kern_mountctl(const char *path, int op, struct file *fp, 981 const void *ctl, int ctllen, 982 void *buf, int buflen, int *res) 983 { 984 struct vnode *vp; 985 struct mount *mp; 986 struct nlookupdata nd; 987 int error; 988 989 *res = 0; 990 vp = NULL; 991 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW); 992 if (error == 0) 993 error = nlookup(&nd); 994 if (error == 0) 995 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 996 mp = nd.nl_nch.mount; 997 nlookup_done(&nd); 998 if (error) 999 return (error); 1000 1001 /* 1002 * Must be the root of the filesystem 1003 */ 1004 if ((vp->v_flag & (VROOT|VPFSROOT)) == 0) { 1005 vput(vp); 1006 return (EINVAL); 1007 } 1008 error = vop_mountctl(mp->mnt_vn_use_ops, op, fp, ctl, ctllen, 1009 buf, buflen, res); 1010 vput(vp); 1011 return (error); 1012 } 1013 1014 int 1015 kern_statfs(struct nlookupdata *nd, struct statfs *buf) 1016 { 1017 struct thread *td = curthread; 1018 struct proc *p = td->td_proc; 1019 struct mount *mp; 1020 struct statfs *sp; 1021 char *fullpath, *freepath; 1022 int error; 1023 1024 if ((error = nlookup(nd)) != 0) 1025 return (error); 1026 mp = nd->nl_nch.mount; 1027 sp = &mp->mnt_stat; 1028 if ((error = VFS_STATFS(mp, sp, nd->nl_cred)) != 0) 1029 return (error); 1030 1031 error = mount_path(p, mp, &fullpath, &freepath); 1032 if (error) 1033 return(error); 1034 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 1035 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 1036 kfree(freepath, M_TEMP); 1037 1038 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1039 bcopy(sp, buf, sizeof(*buf)); 1040 /* Only root should have access to the fsid's. */ 1041 if (priv_check(td, PRIV_ROOT)) 1042 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 1043 return (0); 1044 } 1045 1046 /* 1047 * statfs_args(char *path, struct statfs *buf) 1048 * 1049 * Get filesystem statistics. 1050 */ 1051 int 1052 sys_statfs(struct statfs_args *uap) 1053 { 1054 struct nlookupdata nd; 1055 struct statfs buf; 1056 int error; 1057 1058 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1059 if (error == 0) 1060 error = kern_statfs(&nd, &buf); 1061 nlookup_done(&nd); 1062 if (error == 0) 1063 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 1064 return (error); 1065 } 1066 1067 int 1068 kern_fstatfs(int fd, struct statfs *buf) 1069 { 1070 struct thread *td = curthread; 1071 struct proc *p = td->td_proc; 1072 struct file *fp; 1073 struct mount *mp; 1074 struct statfs *sp; 1075 char *fullpath, *freepath; 1076 int error; 1077 1078 KKASSERT(p); 1079 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 1080 return (error); 1081 mp = ((struct vnode *)fp->f_data)->v_mount; 1082 if (mp == NULL) { 1083 error = EBADF; 1084 goto done; 1085 } 1086 if (fp->f_cred == NULL) { 1087 error = EINVAL; 1088 goto done; 1089 } 1090 sp = &mp->mnt_stat; 1091 if ((error = VFS_STATFS(mp, sp, fp->f_cred)) != 0) 1092 goto done; 1093 1094 if ((error = mount_path(p, mp, &fullpath, &freepath)) != 0) 1095 goto done; 1096 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 1097 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 1098 kfree(freepath, M_TEMP); 1099 1100 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1101 bcopy(sp, buf, sizeof(*buf)); 1102 1103 /* Only root should have access to the fsid's. */ 1104 if (priv_check(td, PRIV_ROOT)) 1105 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 1106 error = 0; 1107 done: 1108 fdrop(fp); 1109 return (error); 1110 } 1111 1112 /* 1113 * fstatfs_args(int fd, struct statfs *buf) 1114 * 1115 * Get filesystem statistics. 1116 */ 1117 int 1118 sys_fstatfs(struct fstatfs_args *uap) 1119 { 1120 struct statfs buf; 1121 int error; 1122 1123 error = kern_fstatfs(uap->fd, &buf); 1124 1125 if (error == 0) 1126 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 1127 return (error); 1128 } 1129 1130 int 1131 kern_statvfs(struct nlookupdata *nd, struct statvfs *buf) 1132 { 1133 struct mount *mp; 1134 struct statvfs *sp; 1135 int error; 1136 1137 if ((error = nlookup(nd)) != 0) 1138 return (error); 1139 mp = nd->nl_nch.mount; 1140 sp = &mp->mnt_vstat; 1141 if ((error = VFS_STATVFS(mp, sp, nd->nl_cred)) != 0) 1142 return (error); 1143 1144 sp->f_flag = 0; 1145 if (mp->mnt_flag & MNT_RDONLY) 1146 sp->f_flag |= ST_RDONLY; 1147 if (mp->mnt_flag & MNT_NOSUID) 1148 sp->f_flag |= ST_NOSUID; 1149 bcopy(sp, buf, sizeof(*buf)); 1150 return (0); 1151 } 1152 1153 /* 1154 * statfs_args(char *path, struct statfs *buf) 1155 * 1156 * Get filesystem statistics. 1157 */ 1158 int 1159 sys_statvfs(struct statvfs_args *uap) 1160 { 1161 struct nlookupdata nd; 1162 struct statvfs buf; 1163 int error; 1164 1165 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1166 if (error == 0) 1167 error = kern_statvfs(&nd, &buf); 1168 nlookup_done(&nd); 1169 if (error == 0) 1170 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 1171 return (error); 1172 } 1173 1174 int 1175 kern_fstatvfs(int fd, struct statvfs *buf) 1176 { 1177 struct thread *td = curthread; 1178 struct proc *p = td->td_proc; 1179 struct file *fp; 1180 struct mount *mp; 1181 struct statvfs *sp; 1182 int error; 1183 1184 KKASSERT(p); 1185 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 1186 return (error); 1187 mp = ((struct vnode *)fp->f_data)->v_mount; 1188 if (mp == NULL) { 1189 error = EBADF; 1190 goto done; 1191 } 1192 if (fp->f_cred == NULL) { 1193 error = EINVAL; 1194 goto done; 1195 } 1196 sp = &mp->mnt_vstat; 1197 if ((error = VFS_STATVFS(mp, sp, fp->f_cred)) != 0) 1198 goto done; 1199 1200 sp->f_flag = 0; 1201 if (mp->mnt_flag & MNT_RDONLY) 1202 sp->f_flag |= ST_RDONLY; 1203 if (mp->mnt_flag & MNT_NOSUID) 1204 sp->f_flag |= ST_NOSUID; 1205 1206 bcopy(sp, buf, sizeof(*buf)); 1207 error = 0; 1208 done: 1209 fdrop(fp); 1210 return (error); 1211 } 1212 1213 /* 1214 * fstatfs_args(int fd, struct statfs *buf) 1215 * 1216 * Get filesystem statistics. 1217 */ 1218 int 1219 sys_fstatvfs(struct fstatvfs_args *uap) 1220 { 1221 struct statvfs buf; 1222 int error; 1223 1224 error = kern_fstatvfs(uap->fd, &buf); 1225 1226 if (error == 0) 1227 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 1228 return (error); 1229 } 1230 1231 /* 1232 * getfsstat_args(struct statfs *buf, long bufsize, int flags) 1233 * 1234 * Get statistics on all filesystems. 1235 */ 1236 1237 struct getfsstat_info { 1238 struct statfs *sfsp; 1239 long count; 1240 long maxcount; 1241 int error; 1242 int flags; 1243 struct proc *p; 1244 }; 1245 1246 static int getfsstat_callback(struct mount *, void *); 1247 1248 /* ARGSUSED */ 1249 int 1250 sys_getfsstat(struct getfsstat_args *uap) 1251 { 1252 struct thread *td = curthread; 1253 struct proc *p = td->td_proc; 1254 struct getfsstat_info info; 1255 1256 bzero(&info, sizeof(info)); 1257 1258 info.maxcount = uap->bufsize / sizeof(struct statfs); 1259 info.sfsp = uap->buf; 1260 info.count = 0; 1261 info.flags = uap->flags; 1262 info.p = p; 1263 1264 mountlist_scan(getfsstat_callback, &info, MNTSCAN_FORWARD); 1265 if (info.sfsp && info.count > info.maxcount) 1266 uap->sysmsg_result = info.maxcount; 1267 else 1268 uap->sysmsg_result = info.count; 1269 return (info.error); 1270 } 1271 1272 static int 1273 getfsstat_callback(struct mount *mp, void *data) 1274 { 1275 struct getfsstat_info *info = data; 1276 struct statfs *sp; 1277 char *freepath; 1278 char *fullpath; 1279 int error; 1280 1281 if (info->sfsp && info->count < info->maxcount) { 1282 if (info->p && !chroot_visible_mnt(mp, info->p)) 1283 return(0); 1284 sp = &mp->mnt_stat; 1285 1286 /* 1287 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1288 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY 1289 * overrides MNT_WAIT. 1290 */ 1291 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || 1292 (info->flags & MNT_WAIT)) && 1293 (error = VFS_STATFS(mp, sp, info->p->p_ucred))) { 1294 return(0); 1295 } 1296 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1297 1298 error = mount_path(info->p, mp, &fullpath, &freepath); 1299 if (error) { 1300 info->error = error; 1301 return(-1); 1302 } 1303 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 1304 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 1305 kfree(freepath, M_TEMP); 1306 1307 error = copyout(sp, info->sfsp, sizeof(*sp)); 1308 if (error) { 1309 info->error = error; 1310 return (-1); 1311 } 1312 ++info->sfsp; 1313 } 1314 info->count++; 1315 return(0); 1316 } 1317 1318 /* 1319 * getvfsstat_args(struct statfs *buf, struct statvfs *vbuf, 1320 long bufsize, int flags) 1321 * 1322 * Get statistics on all filesystems. 1323 */ 1324 1325 struct getvfsstat_info { 1326 struct statfs *sfsp; 1327 struct statvfs *vsfsp; 1328 long count; 1329 long maxcount; 1330 int error; 1331 int flags; 1332 struct proc *p; 1333 }; 1334 1335 static int getvfsstat_callback(struct mount *, void *); 1336 1337 /* ARGSUSED */ 1338 int 1339 sys_getvfsstat(struct getvfsstat_args *uap) 1340 { 1341 struct thread *td = curthread; 1342 struct proc *p = td->td_proc; 1343 struct getvfsstat_info info; 1344 1345 bzero(&info, sizeof(info)); 1346 1347 info.maxcount = uap->vbufsize / sizeof(struct statvfs); 1348 info.sfsp = uap->buf; 1349 info.vsfsp = uap->vbuf; 1350 info.count = 0; 1351 info.flags = uap->flags; 1352 info.p = p; 1353 1354 mountlist_scan(getvfsstat_callback, &info, MNTSCAN_FORWARD); 1355 if (info.vsfsp && info.count > info.maxcount) 1356 uap->sysmsg_result = info.maxcount; 1357 else 1358 uap->sysmsg_result = info.count; 1359 return (info.error); 1360 } 1361 1362 static int 1363 getvfsstat_callback(struct mount *mp, void *data) 1364 { 1365 struct getvfsstat_info *info = data; 1366 struct statfs *sp; 1367 struct statvfs *vsp; 1368 char *freepath; 1369 char *fullpath; 1370 int error; 1371 1372 if (info->vsfsp && info->count < info->maxcount) { 1373 if (info->p && !chroot_visible_mnt(mp, info->p)) 1374 return(0); 1375 sp = &mp->mnt_stat; 1376 vsp = &mp->mnt_vstat; 1377 1378 /* 1379 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1380 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY 1381 * overrides MNT_WAIT. 1382 */ 1383 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || 1384 (info->flags & MNT_WAIT)) && 1385 (error = VFS_STATFS(mp, sp, info->p->p_ucred))) { 1386 return(0); 1387 } 1388 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1389 1390 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || 1391 (info->flags & MNT_WAIT)) && 1392 (error = VFS_STATVFS(mp, vsp, info->p->p_ucred))) { 1393 return(0); 1394 } 1395 vsp->f_flag = 0; 1396 if (mp->mnt_flag & MNT_RDONLY) 1397 vsp->f_flag |= ST_RDONLY; 1398 if (mp->mnt_flag & MNT_NOSUID) 1399 vsp->f_flag |= ST_NOSUID; 1400 1401 error = mount_path(info->p, mp, &fullpath, &freepath); 1402 if (error) { 1403 info->error = error; 1404 return(-1); 1405 } 1406 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 1407 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 1408 kfree(freepath, M_TEMP); 1409 1410 error = copyout(sp, info->sfsp, sizeof(*sp)); 1411 if (error == 0) 1412 error = copyout(vsp, info->vsfsp, sizeof(*vsp)); 1413 if (error) { 1414 info->error = error; 1415 return (-1); 1416 } 1417 ++info->sfsp; 1418 ++info->vsfsp; 1419 } 1420 info->count++; 1421 return(0); 1422 } 1423 1424 1425 /* 1426 * fchdir_args(int fd) 1427 * 1428 * Change current working directory to a given file descriptor. 1429 */ 1430 /* ARGSUSED */ 1431 int 1432 sys_fchdir(struct fchdir_args *uap) 1433 { 1434 struct thread *td = curthread; 1435 struct proc *p = td->td_proc; 1436 struct filedesc *fdp = p->p_fd; 1437 struct vnode *vp, *ovp; 1438 struct mount *mp; 1439 struct file *fp; 1440 struct nchandle nch, onch, tnch; 1441 int error; 1442 1443 if ((error = holdvnode(fdp, uap->fd, &fp)) != 0) 1444 return (error); 1445 vp = (struct vnode *)fp->f_data; 1446 vref(vp); 1447 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1448 if (vp->v_type != VDIR || fp->f_nchandle.ncp == NULL) 1449 error = ENOTDIR; 1450 else 1451 error = VOP_ACCESS(vp, VEXEC, p->p_ucred); 1452 if (error) { 1453 vput(vp); 1454 fdrop(fp); 1455 return (error); 1456 } 1457 cache_copy(&fp->f_nchandle, &nch); 1458 1459 /* 1460 * If the ncp has become a mount point, traverse through 1461 * the mount point. 1462 */ 1463 1464 while (!error && (nch.ncp->nc_flag & NCF_ISMOUNTPT) && 1465 (mp = cache_findmount(&nch)) != NULL 1466 ) { 1467 error = nlookup_mp(mp, &tnch); 1468 if (error == 0) { 1469 cache_unlock(&tnch); /* leave ref intact */ 1470 vput(vp); 1471 vp = tnch.ncp->nc_vp; 1472 error = vget(vp, LK_SHARED); 1473 KKASSERT(error == 0); 1474 cache_drop(&nch); 1475 nch = tnch; 1476 } 1477 } 1478 if (error == 0) { 1479 ovp = fdp->fd_cdir; 1480 onch = fdp->fd_ncdir; 1481 vn_unlock(vp); /* leave ref intact */ 1482 fdp->fd_cdir = vp; 1483 fdp->fd_ncdir = nch; 1484 cache_drop(&onch); 1485 vrele(ovp); 1486 } else { 1487 cache_drop(&nch); 1488 vput(vp); 1489 } 1490 fdrop(fp); 1491 return (error); 1492 } 1493 1494 int 1495 kern_chdir(struct nlookupdata *nd) 1496 { 1497 struct thread *td = curthread; 1498 struct proc *p = td->td_proc; 1499 struct filedesc *fdp = p->p_fd; 1500 struct vnode *vp, *ovp; 1501 struct nchandle onch; 1502 int error; 1503 1504 if ((error = nlookup(nd)) != 0) 1505 return (error); 1506 if ((vp = nd->nl_nch.ncp->nc_vp) == NULL) 1507 return (ENOENT); 1508 if ((error = vget(vp, LK_SHARED)) != 0) 1509 return (error); 1510 1511 error = checkvp_chdir(vp, td); 1512 vn_unlock(vp); 1513 if (error == 0) { 1514 ovp = fdp->fd_cdir; 1515 onch = fdp->fd_ncdir; 1516 cache_unlock(&nd->nl_nch); /* leave reference intact */ 1517 fdp->fd_ncdir = nd->nl_nch; 1518 fdp->fd_cdir = vp; 1519 cache_drop(&onch); 1520 vrele(ovp); 1521 cache_zero(&nd->nl_nch); 1522 } else { 1523 vrele(vp); 1524 } 1525 return (error); 1526 } 1527 1528 /* 1529 * chdir_args(char *path) 1530 * 1531 * Change current working directory (``.''). 1532 */ 1533 int 1534 sys_chdir(struct chdir_args *uap) 1535 { 1536 struct nlookupdata nd; 1537 int error; 1538 1539 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1540 if (error == 0) 1541 error = kern_chdir(&nd); 1542 nlookup_done(&nd); 1543 return (error); 1544 } 1545 1546 /* 1547 * Helper function for raised chroot(2) security function: Refuse if 1548 * any filedescriptors are open directories. 1549 */ 1550 static int 1551 chroot_refuse_vdir_fds(struct filedesc *fdp) 1552 { 1553 struct vnode *vp; 1554 struct file *fp; 1555 int error; 1556 int fd; 1557 1558 for (fd = 0; fd < fdp->fd_nfiles ; fd++) { 1559 if ((error = holdvnode(fdp, fd, &fp)) != 0) 1560 continue; 1561 vp = (struct vnode *)fp->f_data; 1562 if (vp->v_type != VDIR) { 1563 fdrop(fp); 1564 continue; 1565 } 1566 fdrop(fp); 1567 return(EPERM); 1568 } 1569 return (0); 1570 } 1571 1572 /* 1573 * This sysctl determines if we will allow a process to chroot(2) if it 1574 * has a directory open: 1575 * 0: disallowed for all processes. 1576 * 1: allowed for processes that were not already chroot(2)'ed. 1577 * 2: allowed for all processes. 1578 */ 1579 1580 static int chroot_allow_open_directories = 1; 1581 1582 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, 1583 &chroot_allow_open_directories, 0, ""); 1584 1585 /* 1586 * chroot to the specified namecache entry. We obtain the vp from the 1587 * namecache data. The passed ncp must be locked and referenced and will 1588 * remain locked and referenced on return. 1589 */ 1590 int 1591 kern_chroot(struct nchandle *nch) 1592 { 1593 struct thread *td = curthread; 1594 struct proc *p = td->td_proc; 1595 struct filedesc *fdp = p->p_fd; 1596 struct vnode *vp; 1597 int error; 1598 1599 /* 1600 * Only root can chroot 1601 */ 1602 if ((error = priv_check_cred(p->p_ucred, PRIV_ROOT, PRISON_ROOT)) != 0) 1603 return (error); 1604 1605 /* 1606 * Disallow open directory descriptors (fchdir() breakouts). 1607 */ 1608 if (chroot_allow_open_directories == 0 || 1609 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { 1610 if ((error = chroot_refuse_vdir_fds(fdp)) != 0) 1611 return (error); 1612 } 1613 if ((vp = nch->ncp->nc_vp) == NULL) 1614 return (ENOENT); 1615 1616 if ((error = vget(vp, LK_SHARED)) != 0) 1617 return (error); 1618 1619 /* 1620 * Check the validity of vp as a directory to change to and 1621 * associate it with rdir/jdir. 1622 */ 1623 error = checkvp_chdir(vp, td); 1624 vn_unlock(vp); /* leave reference intact */ 1625 if (error == 0) { 1626 vrele(fdp->fd_rdir); 1627 fdp->fd_rdir = vp; /* reference inherited by fd_rdir */ 1628 cache_drop(&fdp->fd_nrdir); 1629 cache_copy(nch, &fdp->fd_nrdir); 1630 if (fdp->fd_jdir == NULL) { 1631 fdp->fd_jdir = vp; 1632 vref(fdp->fd_jdir); 1633 cache_copy(nch, &fdp->fd_njdir); 1634 } 1635 } else { 1636 vrele(vp); 1637 } 1638 return (error); 1639 } 1640 1641 /* 1642 * chroot_args(char *path) 1643 * 1644 * Change notion of root (``/'') directory. 1645 */ 1646 /* ARGSUSED */ 1647 int 1648 sys_chroot(struct chroot_args *uap) 1649 { 1650 struct thread *td = curthread; 1651 struct nlookupdata nd; 1652 int error; 1653 1654 KKASSERT(td->td_proc); 1655 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1656 if (error) { 1657 nlookup_done(&nd); 1658 return(error); 1659 } 1660 nd.nl_flags |= NLC_EXEC; 1661 error = nlookup(&nd); 1662 if (error == 0) 1663 error = kern_chroot(&nd.nl_nch); 1664 nlookup_done(&nd); 1665 return(error); 1666 } 1667 1668 /* 1669 * Common routine for chroot and chdir. Given a locked, referenced vnode, 1670 * determine whether it is legal to chdir to the vnode. The vnode's state 1671 * is not changed by this call. 1672 */ 1673 int 1674 checkvp_chdir(struct vnode *vp, struct thread *td) 1675 { 1676 int error; 1677 1678 if (vp->v_type != VDIR) 1679 error = ENOTDIR; 1680 else 1681 error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred); 1682 return (error); 1683 } 1684 1685 int 1686 kern_open(struct nlookupdata *nd, int oflags, int mode, int *res) 1687 { 1688 struct thread *td = curthread; 1689 struct proc *p = td->td_proc; 1690 struct lwp *lp = td->td_lwp; 1691 struct filedesc *fdp = p->p_fd; 1692 int cmode, flags; 1693 struct file *nfp; 1694 struct file *fp; 1695 struct vnode *vp; 1696 int type, indx, error; 1697 struct flock lf; 1698 1699 if ((oflags & O_ACCMODE) == O_ACCMODE) 1700 return (EINVAL); 1701 flags = FFLAGS(oflags); 1702 error = falloc(p, &nfp, NULL); 1703 if (error) 1704 return (error); 1705 fp = nfp; 1706 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; 1707 1708 /* 1709 * XXX p_dupfd is a real mess. It allows a device to return a 1710 * file descriptor to be duplicated rather then doing the open 1711 * itself. 1712 */ 1713 lp->lwp_dupfd = -1; 1714 1715 /* 1716 * Call vn_open() to do the lookup and assign the vnode to the 1717 * file pointer. vn_open() does not change the ref count on fp 1718 * and the vnode, on success, will be inherited by the file pointer 1719 * and unlocked. 1720 */ 1721 nd->nl_flags |= NLC_LOCKVP; 1722 error = vn_open(nd, fp, flags, cmode); 1723 nlookup_done(nd); 1724 if (error) { 1725 /* 1726 * handle special fdopen() case. bleh. dupfdopen() is 1727 * responsible for dropping the old contents of ofiles[indx] 1728 * if it succeeds. 1729 * 1730 * Note that fsetfd() will add a ref to fp which represents 1731 * the fd_files[] assignment. We must still drop our 1732 * reference. 1733 */ 1734 if ((error == ENODEV || error == ENXIO) && lp->lwp_dupfd >= 0) { 1735 if (fdalloc(p, 0, &indx) == 0) { 1736 error = dupfdopen(p, indx, lp->lwp_dupfd, flags, error); 1737 if (error == 0) { 1738 *res = indx; 1739 fdrop(fp); /* our ref */ 1740 return (0); 1741 } 1742 fsetfd(p, NULL, indx); 1743 } 1744 } 1745 fdrop(fp); /* our ref */ 1746 if (error == ERESTART) 1747 error = EINTR; 1748 return (error); 1749 } 1750 1751 /* 1752 * ref the vnode for ourselves so it can't be ripped out from under 1753 * is. XXX need an ND flag to request that the vnode be returned 1754 * anyway. 1755 * 1756 * Reserve a file descriptor but do not assign it until the open 1757 * succeeds. 1758 */ 1759 vp = (struct vnode *)fp->f_data; 1760 vref(vp); 1761 if ((error = fdalloc(p, 0, &indx)) != 0) { 1762 fdrop(fp); 1763 vrele(vp); 1764 return (error); 1765 } 1766 1767 /* 1768 * If no error occurs the vp will have been assigned to the file 1769 * pointer. 1770 */ 1771 lp->lwp_dupfd = 0; 1772 1773 if (flags & (O_EXLOCK | O_SHLOCK)) { 1774 lf.l_whence = SEEK_SET; 1775 lf.l_start = 0; 1776 lf.l_len = 0; 1777 if (flags & O_EXLOCK) 1778 lf.l_type = F_WRLCK; 1779 else 1780 lf.l_type = F_RDLCK; 1781 if (flags & FNONBLOCK) 1782 type = 0; 1783 else 1784 type = F_WAIT; 1785 1786 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { 1787 /* 1788 * lock request failed. Clean up the reserved 1789 * descriptor. 1790 */ 1791 vrele(vp); 1792 fsetfd(p, NULL, indx); 1793 fdrop(fp); 1794 return (error); 1795 } 1796 fp->f_flag |= FHASLOCK; 1797 } 1798 #if 0 1799 /* 1800 * Assert that all regular file vnodes were created with a object. 1801 */ 1802 KASSERT(vp->v_type != VREG || vp->v_object != NULL, 1803 ("open: regular file has no backing object after vn_open")); 1804 #endif 1805 1806 vrele(vp); 1807 1808 /* 1809 * release our private reference, leaving the one associated with the 1810 * descriptor table intact. 1811 */ 1812 fsetfd(p, fp, indx); 1813 fdrop(fp); 1814 *res = indx; 1815 return (0); 1816 } 1817 1818 /* 1819 * open_args(char *path, int flags, int mode) 1820 * 1821 * Check permissions, allocate an open file structure, 1822 * and call the device open routine if any. 1823 */ 1824 int 1825 sys_open(struct open_args *uap) 1826 { 1827 struct nlookupdata nd; 1828 int error; 1829 1830 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1831 if (error == 0) { 1832 error = kern_open(&nd, uap->flags, 1833 uap->mode, &uap->sysmsg_result); 1834 } 1835 nlookup_done(&nd); 1836 return (error); 1837 } 1838 1839 int 1840 kern_mknod(struct nlookupdata *nd, int mode, int rmajor, int rminor) 1841 { 1842 struct thread *td = curthread; 1843 struct proc *p = td->td_proc; 1844 struct vnode *vp; 1845 struct vattr vattr; 1846 int error; 1847 int whiteout = 0; 1848 1849 KKASSERT(p); 1850 1851 switch (mode & S_IFMT) { 1852 case S_IFCHR: 1853 case S_IFBLK: 1854 error = priv_check(td, PRIV_ROOT); 1855 break; 1856 default: 1857 error = priv_check_cred(p->p_ucred, PRIV_ROOT, PRISON_ROOT); 1858 break; 1859 } 1860 if (error) 1861 return (error); 1862 1863 bwillinode(1); 1864 nd->nl_flags |= NLC_CREATE | NLC_REFDVP; 1865 if ((error = nlookup(nd)) != 0) 1866 return (error); 1867 if (nd->nl_nch.ncp->nc_vp) 1868 return (EEXIST); 1869 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 1870 return (error); 1871 1872 VATTR_NULL(&vattr); 1873 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; 1874 vattr.va_rmajor = rmajor; 1875 vattr.va_rminor = rminor; 1876 whiteout = 0; 1877 1878 switch (mode & S_IFMT) { 1879 case S_IFMT: /* used by badsect to flag bad sectors */ 1880 vattr.va_type = VBAD; 1881 break; 1882 case S_IFCHR: 1883 vattr.va_type = VCHR; 1884 break; 1885 case S_IFBLK: 1886 vattr.va_type = VBLK; 1887 break; 1888 case S_IFWHT: 1889 whiteout = 1; 1890 break; 1891 case S_IFDIR: 1892 /* special directories support for HAMMER */ 1893 vattr.va_type = VDIR; 1894 break; 1895 default: 1896 error = EINVAL; 1897 break; 1898 } 1899 if (error == 0) { 1900 if (whiteout) { 1901 error = VOP_NWHITEOUT(&nd->nl_nch, nd->nl_dvp, 1902 nd->nl_cred, NAMEI_CREATE); 1903 } else { 1904 vp = NULL; 1905 error = VOP_NMKNOD(&nd->nl_nch, nd->nl_dvp, 1906 &vp, nd->nl_cred, &vattr); 1907 if (error == 0) 1908 vput(vp); 1909 } 1910 } 1911 return (error); 1912 } 1913 1914 /* 1915 * mknod_args(char *path, int mode, int dev) 1916 * 1917 * Create a special file. 1918 */ 1919 int 1920 sys_mknod(struct mknod_args *uap) 1921 { 1922 struct nlookupdata nd; 1923 int error; 1924 1925 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1926 if (error == 0) { 1927 error = kern_mknod(&nd, uap->mode, 1928 umajor(uap->dev), uminor(uap->dev)); 1929 } 1930 nlookup_done(&nd); 1931 return (error); 1932 } 1933 1934 int 1935 kern_mkfifo(struct nlookupdata *nd, int mode) 1936 { 1937 struct thread *td = curthread; 1938 struct proc *p = td->td_proc; 1939 struct vattr vattr; 1940 struct vnode *vp; 1941 int error; 1942 1943 bwillinode(1); 1944 1945 nd->nl_flags |= NLC_CREATE | NLC_REFDVP; 1946 if ((error = nlookup(nd)) != 0) 1947 return (error); 1948 if (nd->nl_nch.ncp->nc_vp) 1949 return (EEXIST); 1950 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 1951 return (error); 1952 1953 VATTR_NULL(&vattr); 1954 vattr.va_type = VFIFO; 1955 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; 1956 vp = NULL; 1957 error = VOP_NMKNOD(&nd->nl_nch, nd->nl_dvp, &vp, nd->nl_cred, &vattr); 1958 if (error == 0) 1959 vput(vp); 1960 return (error); 1961 } 1962 1963 /* 1964 * mkfifo_args(char *path, int mode) 1965 * 1966 * Create a named pipe. 1967 */ 1968 int 1969 sys_mkfifo(struct mkfifo_args *uap) 1970 { 1971 struct nlookupdata nd; 1972 int error; 1973 1974 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1975 if (error == 0) 1976 error = kern_mkfifo(&nd, uap->mode); 1977 nlookup_done(&nd); 1978 return (error); 1979 } 1980 1981 static int hardlink_check_uid = 0; 1982 SYSCTL_INT(_security, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1983 &hardlink_check_uid, 0, 1984 "Unprivileged processes cannot create hard links to files owned by other " 1985 "users"); 1986 static int hardlink_check_gid = 0; 1987 SYSCTL_INT(_security, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1988 &hardlink_check_gid, 0, 1989 "Unprivileged processes cannot create hard links to files owned by other " 1990 "groups"); 1991 1992 static int 1993 can_hardlink(struct vnode *vp, struct thread *td, struct ucred *cred) 1994 { 1995 struct vattr va; 1996 int error; 1997 1998 /* 1999 * Shortcut if disabled 2000 */ 2001 if (hardlink_check_uid == 0 && hardlink_check_gid == 0) 2002 return (0); 2003 2004 /* 2005 * root cred can always hardlink 2006 */ 2007 if (priv_check_cred(cred, PRIV_ROOT, PRISON_ROOT) == 0) 2008 return (0); 2009 2010 /* 2011 * Otherwise only if the originating file is owned by the 2012 * same user or group. Note that any group is allowed if 2013 * the file is owned by the caller. 2014 */ 2015 error = VOP_GETATTR(vp, &va); 2016 if (error != 0) 2017 return (error); 2018 2019 if (hardlink_check_uid) { 2020 if (cred->cr_uid != va.va_uid) 2021 return (EPERM); 2022 } 2023 2024 if (hardlink_check_gid) { 2025 if (cred->cr_uid != va.va_uid && !groupmember(va.va_gid, cred)) 2026 return (EPERM); 2027 } 2028 2029 return (0); 2030 } 2031 2032 int 2033 kern_link(struct nlookupdata *nd, struct nlookupdata *linknd) 2034 { 2035 struct thread *td = curthread; 2036 struct vnode *vp; 2037 int error; 2038 2039 /* 2040 * Lookup the source and obtained a locked vnode. 2041 * 2042 * You may only hardlink a file which you have write permission 2043 * on or which you own. 2044 * 2045 * XXX relookup on vget failure / race ? 2046 */ 2047 bwillinode(1); 2048 nd->nl_flags |= NLC_WRITE | NLC_OWN | NLC_HLINK; 2049 if ((error = nlookup(nd)) != 0) 2050 return (error); 2051 vp = nd->nl_nch.ncp->nc_vp; 2052 KKASSERT(vp != NULL); 2053 if (vp->v_type == VDIR) 2054 return (EPERM); /* POSIX */ 2055 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 2056 return (error); 2057 if ((error = vget(vp, LK_EXCLUSIVE)) != 0) 2058 return (error); 2059 2060 /* 2061 * Unlock the source so we can lookup the target without deadlocking 2062 * (XXX vp is locked already, possible other deadlock?). The target 2063 * must not exist. 2064 */ 2065 KKASSERT(nd->nl_flags & NLC_NCPISLOCKED); 2066 nd->nl_flags &= ~NLC_NCPISLOCKED; 2067 cache_unlock(&nd->nl_nch); 2068 2069 linknd->nl_flags |= NLC_CREATE | NLC_REFDVP; 2070 if ((error = nlookup(linknd)) != 0) { 2071 vput(vp); 2072 return (error); 2073 } 2074 if (linknd->nl_nch.ncp->nc_vp) { 2075 vput(vp); 2076 return (EEXIST); 2077 } 2078 2079 /* 2080 * Finally run the new API VOP. 2081 */ 2082 error = can_hardlink(vp, td, td->td_proc->p_ucred); 2083 if (error == 0) { 2084 error = VOP_NLINK(&linknd->nl_nch, linknd->nl_dvp, 2085 vp, linknd->nl_cred); 2086 } 2087 vput(vp); 2088 return (error); 2089 } 2090 2091 /* 2092 * link_args(char *path, char *link) 2093 * 2094 * Make a hard file link. 2095 */ 2096 int 2097 sys_link(struct link_args *uap) 2098 { 2099 struct nlookupdata nd, linknd; 2100 int error; 2101 2102 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2103 if (error == 0) { 2104 error = nlookup_init(&linknd, uap->link, UIO_USERSPACE, 0); 2105 if (error == 0) 2106 error = kern_link(&nd, &linknd); 2107 nlookup_done(&linknd); 2108 } 2109 nlookup_done(&nd); 2110 return (error); 2111 } 2112 2113 int 2114 kern_symlink(struct nlookupdata *nd, char *path, int mode) 2115 { 2116 struct vattr vattr; 2117 struct vnode *vp; 2118 struct vnode *dvp; 2119 int error; 2120 2121 bwillinode(1); 2122 nd->nl_flags |= NLC_CREATE | NLC_REFDVP; 2123 if ((error = nlookup(nd)) != 0) 2124 return (error); 2125 if (nd->nl_nch.ncp->nc_vp) 2126 return (EEXIST); 2127 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 2128 return (error); 2129 dvp = nd->nl_dvp; 2130 VATTR_NULL(&vattr); 2131 vattr.va_mode = mode; 2132 error = VOP_NSYMLINK(&nd->nl_nch, dvp, &vp, nd->nl_cred, &vattr, path); 2133 if (error == 0) 2134 vput(vp); 2135 return (error); 2136 } 2137 2138 /* 2139 * symlink(char *path, char *link) 2140 * 2141 * Make a symbolic link. 2142 */ 2143 int 2144 sys_symlink(struct symlink_args *uap) 2145 { 2146 struct thread *td = curthread; 2147 struct nlookupdata nd; 2148 char *path; 2149 int error; 2150 int mode; 2151 2152 path = objcache_get(namei_oc, M_WAITOK); 2153 error = copyinstr(uap->path, path, MAXPATHLEN, NULL); 2154 if (error == 0) { 2155 error = nlookup_init(&nd, uap->link, UIO_USERSPACE, 0); 2156 if (error == 0) { 2157 mode = ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask; 2158 error = kern_symlink(&nd, path, mode); 2159 } 2160 nlookup_done(&nd); 2161 } 2162 objcache_put(namei_oc, path); 2163 return (error); 2164 } 2165 2166 /* 2167 * undelete_args(char *path) 2168 * 2169 * Delete a whiteout from the filesystem. 2170 */ 2171 /* ARGSUSED */ 2172 int 2173 sys_undelete(struct undelete_args *uap) 2174 { 2175 struct nlookupdata nd; 2176 int error; 2177 2178 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2179 bwillinode(1); 2180 nd.nl_flags |= NLC_DELETE | NLC_REFDVP; 2181 if (error == 0) 2182 error = nlookup(&nd); 2183 if (error == 0) 2184 error = ncp_writechk(&nd.nl_nch); 2185 if (error == 0) { 2186 error = VOP_NWHITEOUT(&nd.nl_nch, nd.nl_dvp, nd.nl_cred, 2187 NAMEI_DELETE); 2188 } 2189 nlookup_done(&nd); 2190 return (error); 2191 } 2192 2193 int 2194 kern_unlink(struct nlookupdata *nd) 2195 { 2196 int error; 2197 2198 bwillinode(1); 2199 nd->nl_flags |= NLC_DELETE | NLC_REFDVP; 2200 if ((error = nlookup(nd)) != 0) 2201 return (error); 2202 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 2203 return (error); 2204 error = VOP_NREMOVE(&nd->nl_nch, nd->nl_dvp, nd->nl_cred); 2205 return (error); 2206 } 2207 2208 /* 2209 * unlink_args(char *path) 2210 * 2211 * Delete a name from the filesystem. 2212 */ 2213 int 2214 sys_unlink(struct unlink_args *uap) 2215 { 2216 struct nlookupdata nd; 2217 int error; 2218 2219 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2220 if (error == 0) 2221 error = kern_unlink(&nd); 2222 nlookup_done(&nd); 2223 return (error); 2224 } 2225 2226 int 2227 kern_lseek(int fd, off_t offset, int whence, off_t *res) 2228 { 2229 struct thread *td = curthread; 2230 struct proc *p = td->td_proc; 2231 struct file *fp; 2232 struct vnode *vp; 2233 struct vattr vattr; 2234 off_t new_offset; 2235 int error; 2236 2237 fp = holdfp(p->p_fd, fd, -1); 2238 if (fp == NULL) 2239 return (EBADF); 2240 if (fp->f_type != DTYPE_VNODE) { 2241 error = ESPIPE; 2242 goto done; 2243 } 2244 vp = (struct vnode *)fp->f_data; 2245 2246 switch (whence) { 2247 case L_INCR: 2248 new_offset = fp->f_offset + offset; 2249 error = 0; 2250 break; 2251 case L_XTND: 2252 error = VOP_GETATTR(vp, &vattr); 2253 new_offset = offset + vattr.va_size; 2254 break; 2255 case L_SET: 2256 new_offset = offset; 2257 error = 0; 2258 break; 2259 default: 2260 new_offset = 0; 2261 error = EINVAL; 2262 break; 2263 } 2264 2265 /* 2266 * Validate the seek position. Negative offsets are not allowed 2267 * for regular files, block specials, or directories. 2268 */ 2269 if (error == 0) { 2270 if (new_offset < 0 && 2271 (vp->v_type == VREG || vp->v_type == VDIR || 2272 vp->v_type == VCHR || vp->v_type == VBLK)) { 2273 error = EINVAL; 2274 } else { 2275 fp->f_offset = new_offset; 2276 } 2277 } 2278 *res = fp->f_offset; 2279 done: 2280 fdrop(fp); 2281 return (error); 2282 } 2283 2284 /* 2285 * lseek_args(int fd, int pad, off_t offset, int whence) 2286 * 2287 * Reposition read/write file offset. 2288 */ 2289 int 2290 sys_lseek(struct lseek_args *uap) 2291 { 2292 int error; 2293 2294 error = kern_lseek(uap->fd, uap->offset, uap->whence, 2295 &uap->sysmsg_offset); 2296 2297 return (error); 2298 } 2299 2300 int 2301 kern_access(struct nlookupdata *nd, int aflags) 2302 { 2303 struct vnode *vp; 2304 int error, flags; 2305 2306 if ((error = nlookup(nd)) != 0) 2307 return (error); 2308 retry: 2309 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &vp); 2310 if (error) 2311 return (error); 2312 2313 /* Flags == 0 means only check for existence. */ 2314 if (aflags) { 2315 flags = 0; 2316 if (aflags & R_OK) 2317 flags |= VREAD; 2318 if (aflags & W_OK) 2319 flags |= VWRITE; 2320 if (aflags & X_OK) 2321 flags |= VEXEC; 2322 if ((flags & VWRITE) == 0 || 2323 (error = vn_writechk(vp, &nd->nl_nch)) == 0) 2324 error = VOP_ACCESS(vp, flags, nd->nl_cred); 2325 2326 /* 2327 * If the file handle is stale we have to re-resolve the 2328 * entry. This is a hack at the moment. 2329 */ 2330 if (error == ESTALE) { 2331 vput(vp); 2332 cache_setunresolved(&nd->nl_nch); 2333 error = cache_resolve(&nd->nl_nch, nd->nl_cred); 2334 if (error == 0) { 2335 vp = NULL; 2336 goto retry; 2337 } 2338 return(error); 2339 } 2340 } 2341 vput(vp); 2342 return (error); 2343 } 2344 2345 /* 2346 * access_args(char *path, int flags) 2347 * 2348 * Check access permissions. 2349 */ 2350 int 2351 sys_access(struct access_args *uap) 2352 { 2353 struct nlookupdata nd; 2354 int error; 2355 2356 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2357 if (error == 0) 2358 error = kern_access(&nd, uap->flags); 2359 nlookup_done(&nd); 2360 return (error); 2361 } 2362 2363 int 2364 kern_stat(struct nlookupdata *nd, struct stat *st) 2365 { 2366 int error; 2367 struct vnode *vp; 2368 thread_t td; 2369 2370 if ((error = nlookup(nd)) != 0) 2371 return (error); 2372 again: 2373 if ((vp = nd->nl_nch.ncp->nc_vp) == NULL) 2374 return (ENOENT); 2375 2376 td = curthread; 2377 if ((error = vget(vp, LK_SHARED)) != 0) 2378 return (error); 2379 error = vn_stat(vp, st, nd->nl_cred); 2380 2381 /* 2382 * If the file handle is stale we have to re-resolve the entry. This 2383 * is a hack at the moment. 2384 */ 2385 if (error == ESTALE) { 2386 vput(vp); 2387 cache_setunresolved(&nd->nl_nch); 2388 error = cache_resolve(&nd->nl_nch, nd->nl_cred); 2389 if (error == 0) 2390 goto again; 2391 } else { 2392 vput(vp); 2393 } 2394 return (error); 2395 } 2396 2397 /* 2398 * stat_args(char *path, struct stat *ub) 2399 * 2400 * Get file status; this version follows links. 2401 */ 2402 int 2403 sys_stat(struct stat_args *uap) 2404 { 2405 struct nlookupdata nd; 2406 struct stat st; 2407 int error; 2408 2409 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2410 if (error == 0) { 2411 error = kern_stat(&nd, &st); 2412 if (error == 0) 2413 error = copyout(&st, uap->ub, sizeof(*uap->ub)); 2414 } 2415 nlookup_done(&nd); 2416 return (error); 2417 } 2418 2419 /* 2420 * lstat_args(char *path, struct stat *ub) 2421 * 2422 * Get file status; this version does not follow links. 2423 */ 2424 int 2425 sys_lstat(struct lstat_args *uap) 2426 { 2427 struct nlookupdata nd; 2428 struct stat st; 2429 int error; 2430 2431 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2432 if (error == 0) { 2433 error = kern_stat(&nd, &st); 2434 if (error == 0) 2435 error = copyout(&st, uap->ub, sizeof(*uap->ub)); 2436 } 2437 nlookup_done(&nd); 2438 return (error); 2439 } 2440 2441 /* 2442 * pathconf_Args(char *path, int name) 2443 * 2444 * Get configurable pathname variables. 2445 */ 2446 /* ARGSUSED */ 2447 int 2448 sys_pathconf(struct pathconf_args *uap) 2449 { 2450 struct nlookupdata nd; 2451 struct vnode *vp; 2452 int error; 2453 2454 vp = NULL; 2455 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2456 if (error == 0) 2457 error = nlookup(&nd); 2458 if (error == 0) 2459 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 2460 nlookup_done(&nd); 2461 if (error == 0) { 2462 error = VOP_PATHCONF(vp, uap->name, &uap->sysmsg_reg); 2463 vput(vp); 2464 } 2465 return (error); 2466 } 2467 2468 /* 2469 * XXX: daver 2470 * kern_readlink isn't properly split yet. There is a copyin burried 2471 * in VOP_READLINK(). 2472 */ 2473 int 2474 kern_readlink(struct nlookupdata *nd, char *buf, int count, int *res) 2475 { 2476 struct thread *td = curthread; 2477 struct proc *p = td->td_proc; 2478 struct vnode *vp; 2479 struct iovec aiov; 2480 struct uio auio; 2481 int error; 2482 2483 if ((error = nlookup(nd)) != 0) 2484 return (error); 2485 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &vp); 2486 if (error) 2487 return (error); 2488 if (vp->v_type != VLNK) { 2489 error = EINVAL; 2490 } else { 2491 aiov.iov_base = buf; 2492 aiov.iov_len = count; 2493 auio.uio_iov = &aiov; 2494 auio.uio_iovcnt = 1; 2495 auio.uio_offset = 0; 2496 auio.uio_rw = UIO_READ; 2497 auio.uio_segflg = UIO_USERSPACE; 2498 auio.uio_td = td; 2499 auio.uio_resid = count; 2500 error = VOP_READLINK(vp, &auio, p->p_ucred); 2501 } 2502 vput(vp); 2503 *res = count - auio.uio_resid; 2504 return (error); 2505 } 2506 2507 /* 2508 * readlink_args(char *path, char *buf, int count) 2509 * 2510 * Return target name of a symbolic link. 2511 */ 2512 int 2513 sys_readlink(struct readlink_args *uap) 2514 { 2515 struct nlookupdata nd; 2516 int error; 2517 2518 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2519 if (error == 0) { 2520 error = kern_readlink(&nd, uap->buf, uap->count, 2521 &uap->sysmsg_result); 2522 } 2523 nlookup_done(&nd); 2524 return (error); 2525 } 2526 2527 static int 2528 setfflags(struct vnode *vp, int flags) 2529 { 2530 struct thread *td = curthread; 2531 struct proc *p = td->td_proc; 2532 int error; 2533 struct vattr vattr; 2534 2535 /* 2536 * Prevent non-root users from setting flags on devices. When 2537 * a device is reused, users can retain ownership of the device 2538 * if they are allowed to set flags and programs assume that 2539 * chown can't fail when done as root. 2540 */ 2541 if ((vp->v_type == VCHR || vp->v_type == VBLK) && 2542 ((error = priv_check_cred(p->p_ucred, PRIV_ROOT, PRISON_ROOT)) != 0)) 2543 return (error); 2544 2545 /* 2546 * note: vget is required for any operation that might mod the vnode 2547 * so VINACTIVE is properly cleared. 2548 */ 2549 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { 2550 VATTR_NULL(&vattr); 2551 vattr.va_flags = flags; 2552 error = VOP_SETATTR(vp, &vattr, p->p_ucred); 2553 vput(vp); 2554 } 2555 return (error); 2556 } 2557 2558 /* 2559 * chflags(char *path, int flags) 2560 * 2561 * Change flags of a file given a path name. 2562 */ 2563 /* ARGSUSED */ 2564 int 2565 sys_chflags(struct chflags_args *uap) 2566 { 2567 struct nlookupdata nd; 2568 struct vnode *vp; 2569 int error; 2570 2571 vp = NULL; 2572 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2573 if (error == 0) 2574 error = nlookup(&nd); 2575 if (error == 0) 2576 error = ncp_writechk(&nd.nl_nch); 2577 if (error == 0) 2578 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp); 2579 nlookup_done(&nd); 2580 if (error == 0) { 2581 error = setfflags(vp, uap->flags); 2582 vrele(vp); 2583 } 2584 return (error); 2585 } 2586 2587 /* 2588 * lchflags(char *path, int flags) 2589 * 2590 * Change flags of a file given a path name, but don't follow symlinks. 2591 */ 2592 /* ARGSUSED */ 2593 int 2594 sys_lchflags(struct lchflags_args *uap) 2595 { 2596 struct nlookupdata nd; 2597 struct vnode *vp; 2598 int error; 2599 2600 vp = NULL; 2601 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2602 if (error == 0) 2603 error = nlookup(&nd); 2604 if (error == 0) 2605 error = ncp_writechk(&nd.nl_nch); 2606 if (error == 0) 2607 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp); 2608 nlookup_done(&nd); 2609 if (error == 0) { 2610 error = setfflags(vp, uap->flags); 2611 vrele(vp); 2612 } 2613 return (error); 2614 } 2615 2616 /* 2617 * fchflags_args(int fd, int flags) 2618 * 2619 * Change flags of a file given a file descriptor. 2620 */ 2621 /* ARGSUSED */ 2622 int 2623 sys_fchflags(struct fchflags_args *uap) 2624 { 2625 struct thread *td = curthread; 2626 struct proc *p = td->td_proc; 2627 struct file *fp; 2628 int error; 2629 2630 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) 2631 return (error); 2632 if (fp->f_nchandle.ncp) 2633 error = ncp_writechk(&fp->f_nchandle); 2634 if (error == 0) 2635 error = setfflags((struct vnode *) fp->f_data, uap->flags); 2636 fdrop(fp); 2637 return (error); 2638 } 2639 2640 static int 2641 setfmode(struct vnode *vp, int mode) 2642 { 2643 struct thread *td = curthread; 2644 struct proc *p = td->td_proc; 2645 int error; 2646 struct vattr vattr; 2647 2648 /* 2649 * note: vget is required for any operation that might mod the vnode 2650 * so VINACTIVE is properly cleared. 2651 */ 2652 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { 2653 VATTR_NULL(&vattr); 2654 vattr.va_mode = mode & ALLPERMS; 2655 error = VOP_SETATTR(vp, &vattr, p->p_ucred); 2656 vput(vp); 2657 } 2658 return error; 2659 } 2660 2661 int 2662 kern_chmod(struct nlookupdata *nd, int mode) 2663 { 2664 struct vnode *vp; 2665 int error; 2666 2667 if ((error = nlookup(nd)) != 0) 2668 return (error); 2669 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0) 2670 return (error); 2671 if ((error = ncp_writechk(&nd->nl_nch)) == 0) 2672 error = setfmode(vp, mode); 2673 vrele(vp); 2674 return (error); 2675 } 2676 2677 /* 2678 * chmod_args(char *path, int mode) 2679 * 2680 * Change mode of a file given path name. 2681 */ 2682 /* ARGSUSED */ 2683 int 2684 sys_chmod(struct chmod_args *uap) 2685 { 2686 struct nlookupdata nd; 2687 int error; 2688 2689 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2690 if (error == 0) 2691 error = kern_chmod(&nd, uap->mode); 2692 nlookup_done(&nd); 2693 return (error); 2694 } 2695 2696 /* 2697 * lchmod_args(char *path, int mode) 2698 * 2699 * Change mode of a file given path name (don't follow links.) 2700 */ 2701 /* ARGSUSED */ 2702 int 2703 sys_lchmod(struct lchmod_args *uap) 2704 { 2705 struct nlookupdata nd; 2706 int error; 2707 2708 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2709 if (error == 0) 2710 error = kern_chmod(&nd, uap->mode); 2711 nlookup_done(&nd); 2712 return (error); 2713 } 2714 2715 /* 2716 * fchmod_args(int fd, int mode) 2717 * 2718 * Change mode of a file given a file descriptor. 2719 */ 2720 /* ARGSUSED */ 2721 int 2722 sys_fchmod(struct fchmod_args *uap) 2723 { 2724 struct thread *td = curthread; 2725 struct proc *p = td->td_proc; 2726 struct file *fp; 2727 int error; 2728 2729 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) 2730 return (error); 2731 if (fp->f_nchandle.ncp) 2732 error = ncp_writechk(&fp->f_nchandle); 2733 if (error == 0) 2734 error = setfmode((struct vnode *)fp->f_data, uap->mode); 2735 fdrop(fp); 2736 return (error); 2737 } 2738 2739 static int 2740 setfown(struct vnode *vp, uid_t uid, gid_t gid) 2741 { 2742 struct thread *td = curthread; 2743 struct proc *p = td->td_proc; 2744 int error; 2745 struct vattr vattr; 2746 2747 /* 2748 * note: vget is required for any operation that might mod the vnode 2749 * so VINACTIVE is properly cleared. 2750 */ 2751 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { 2752 VATTR_NULL(&vattr); 2753 vattr.va_uid = uid; 2754 vattr.va_gid = gid; 2755 error = VOP_SETATTR(vp, &vattr, p->p_ucred); 2756 vput(vp); 2757 } 2758 return error; 2759 } 2760 2761 int 2762 kern_chown(struct nlookupdata *nd, int uid, int gid) 2763 { 2764 struct vnode *vp; 2765 int error; 2766 2767 if ((error = nlookup(nd)) != 0) 2768 return (error); 2769 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0) 2770 return (error); 2771 if ((error = ncp_writechk(&nd->nl_nch)) == 0) 2772 error = setfown(vp, uid, gid); 2773 vrele(vp); 2774 return (error); 2775 } 2776 2777 /* 2778 * chown(char *path, int uid, int gid) 2779 * 2780 * Set ownership given a path name. 2781 */ 2782 int 2783 sys_chown(struct chown_args *uap) 2784 { 2785 struct nlookupdata nd; 2786 int error; 2787 2788 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2789 if (error == 0) 2790 error = kern_chown(&nd, uap->uid, uap->gid); 2791 nlookup_done(&nd); 2792 return (error); 2793 } 2794 2795 /* 2796 * lchown_args(char *path, int uid, int gid) 2797 * 2798 * Set ownership given a path name, do not cross symlinks. 2799 */ 2800 int 2801 sys_lchown(struct lchown_args *uap) 2802 { 2803 struct nlookupdata nd; 2804 int error; 2805 2806 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2807 if (error == 0) 2808 error = kern_chown(&nd, uap->uid, uap->gid); 2809 nlookup_done(&nd); 2810 return (error); 2811 } 2812 2813 /* 2814 * fchown_args(int fd, int uid, int gid) 2815 * 2816 * Set ownership given a file descriptor. 2817 */ 2818 /* ARGSUSED */ 2819 int 2820 sys_fchown(struct fchown_args *uap) 2821 { 2822 struct thread *td = curthread; 2823 struct proc *p = td->td_proc; 2824 struct file *fp; 2825 int error; 2826 2827 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) 2828 return (error); 2829 if (fp->f_nchandle.ncp) 2830 error = ncp_writechk(&fp->f_nchandle); 2831 if (error == 0) 2832 error = setfown((struct vnode *)fp->f_data, uap->uid, uap->gid); 2833 fdrop(fp); 2834 return (error); 2835 } 2836 2837 static int 2838 getutimes(const struct timeval *tvp, struct timespec *tsp) 2839 { 2840 struct timeval tv[2]; 2841 2842 if (tvp == NULL) { 2843 microtime(&tv[0]); 2844 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); 2845 tsp[1] = tsp[0]; 2846 } else { 2847 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 2848 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 2849 } 2850 return 0; 2851 } 2852 2853 static int 2854 setutimes(struct vnode *vp, struct vattr *vattr, 2855 const struct timespec *ts, int nullflag) 2856 { 2857 struct thread *td = curthread; 2858 struct proc *p = td->td_proc; 2859 int error; 2860 2861 VATTR_NULL(vattr); 2862 vattr->va_atime = ts[0]; 2863 vattr->va_mtime = ts[1]; 2864 if (nullflag) 2865 vattr->va_vaflags |= VA_UTIMES_NULL; 2866 error = VOP_SETATTR(vp, vattr, p->p_ucred); 2867 2868 return error; 2869 } 2870 2871 int 2872 kern_utimes(struct nlookupdata *nd, struct timeval *tptr) 2873 { 2874 struct timespec ts[2]; 2875 struct vnode *vp; 2876 struct vattr vattr; 2877 int error; 2878 2879 if ((error = getutimes(tptr, ts)) != 0) 2880 return (error); 2881 2882 /* 2883 * NOTE: utimes() succeeds for the owner even if the file 2884 * is not user-writable. 2885 */ 2886 nd->nl_flags |= NLC_OWN | NLC_WRITE; 2887 2888 if ((error = nlookup(nd)) != 0) 2889 return (error); 2890 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 2891 return (error); 2892 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0) 2893 return (error); 2894 2895 /* 2896 * note: vget is required for any operation that might mod the vnode 2897 * so VINACTIVE is properly cleared. 2898 */ 2899 if ((error = vn_writechk(vp, &nd->nl_nch)) == 0) { 2900 error = vget(vp, LK_EXCLUSIVE); 2901 if (error == 0) { 2902 error = setutimes(vp, &vattr, ts, (tptr == NULL)); 2903 vput(vp); 2904 } 2905 } 2906 vrele(vp); 2907 return (error); 2908 } 2909 2910 /* 2911 * utimes_args(char *path, struct timeval *tptr) 2912 * 2913 * Set the access and modification times of a file. 2914 */ 2915 int 2916 sys_utimes(struct utimes_args *uap) 2917 { 2918 struct timeval tv[2]; 2919 struct nlookupdata nd; 2920 int error; 2921 2922 if (uap->tptr) { 2923 error = copyin(uap->tptr, tv, sizeof(tv)); 2924 if (error) 2925 return (error); 2926 } 2927 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2928 if (error == 0) 2929 error = kern_utimes(&nd, uap->tptr ? tv : NULL); 2930 nlookup_done(&nd); 2931 return (error); 2932 } 2933 2934 /* 2935 * lutimes_args(char *path, struct timeval *tptr) 2936 * 2937 * Set the access and modification times of a file. 2938 */ 2939 int 2940 sys_lutimes(struct lutimes_args *uap) 2941 { 2942 struct timeval tv[2]; 2943 struct nlookupdata nd; 2944 int error; 2945 2946 if (uap->tptr) { 2947 error = copyin(uap->tptr, tv, sizeof(tv)); 2948 if (error) 2949 return (error); 2950 } 2951 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2952 if (error == 0) 2953 error = kern_utimes(&nd, uap->tptr ? tv : NULL); 2954 nlookup_done(&nd); 2955 return (error); 2956 } 2957 2958 /* 2959 * Set utimes on a file descriptor. The creds used to open the 2960 * file are used to determine whether the operation is allowed 2961 * or not. 2962 */ 2963 int 2964 kern_futimes(int fd, struct timeval *tptr) 2965 { 2966 struct thread *td = curthread; 2967 struct proc *p = td->td_proc; 2968 struct timespec ts[2]; 2969 struct file *fp; 2970 struct vnode *vp; 2971 struct vattr vattr; 2972 int error; 2973 2974 error = getutimes(tptr, ts); 2975 if (error) 2976 return (error); 2977 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 2978 return (error); 2979 if (fp->f_nchandle.ncp) 2980 error = ncp_writechk(&fp->f_nchandle); 2981 if (error == 0) { 2982 vp = fp->f_data; 2983 error = vget(vp, LK_EXCLUSIVE); 2984 if (error == 0) { 2985 error = VOP_GETATTR(vp, &vattr); 2986 if (error == 0) { 2987 error = naccess_va(&vattr, NLC_OWN | NLC_WRITE, 2988 fp->f_cred); 2989 } 2990 if (error == 0) { 2991 error = setutimes(vp, &vattr, ts, 2992 (tptr == NULL)); 2993 } 2994 vput(vp); 2995 } 2996 } 2997 fdrop(fp); 2998 return (error); 2999 } 3000 3001 /* 3002 * futimes_args(int fd, struct timeval *tptr) 3003 * 3004 * Set the access and modification times of a file. 3005 */ 3006 int 3007 sys_futimes(struct futimes_args *uap) 3008 { 3009 struct timeval tv[2]; 3010 int error; 3011 3012 if (uap->tptr) { 3013 error = copyin(uap->tptr, tv, sizeof(tv)); 3014 if (error) 3015 return (error); 3016 } 3017 3018 error = kern_futimes(uap->fd, uap->tptr ? tv : NULL); 3019 3020 return (error); 3021 } 3022 3023 int 3024 kern_truncate(struct nlookupdata *nd, off_t length) 3025 { 3026 struct vnode *vp; 3027 struct vattr vattr; 3028 int error; 3029 3030 if (length < 0) 3031 return(EINVAL); 3032 nd->nl_flags |= NLC_WRITE | NLC_TRUNCATE; 3033 if ((error = nlookup(nd)) != 0) 3034 return (error); 3035 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 3036 return (error); 3037 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0) 3038 return (error); 3039 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) { 3040 vrele(vp); 3041 return (error); 3042 } 3043 if (vp->v_type == VDIR) { 3044 error = EISDIR; 3045 } else if ((error = vn_writechk(vp, &nd->nl_nch)) == 0) { 3046 VATTR_NULL(&vattr); 3047 vattr.va_size = length; 3048 error = VOP_SETATTR(vp, &vattr, nd->nl_cred); 3049 } 3050 vput(vp); 3051 return (error); 3052 } 3053 3054 /* 3055 * truncate(char *path, int pad, off_t length) 3056 * 3057 * Truncate a file given its path name. 3058 */ 3059 int 3060 sys_truncate(struct truncate_args *uap) 3061 { 3062 struct nlookupdata nd; 3063 int error; 3064 3065 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3066 if (error == 0) 3067 error = kern_truncate(&nd, uap->length); 3068 nlookup_done(&nd); 3069 return error; 3070 } 3071 3072 int 3073 kern_ftruncate(int fd, off_t length) 3074 { 3075 struct thread *td = curthread; 3076 struct proc *p = td->td_proc; 3077 struct vattr vattr; 3078 struct vnode *vp; 3079 struct file *fp; 3080 int error; 3081 3082 if (length < 0) 3083 return(EINVAL); 3084 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 3085 return (error); 3086 if (fp->f_nchandle.ncp) { 3087 error = ncp_writechk(&fp->f_nchandle); 3088 if (error) 3089 goto done; 3090 } 3091 if ((fp->f_flag & FWRITE) == 0) { 3092 error = EINVAL; 3093 goto done; 3094 } 3095 if (fp->f_flag & FAPPENDONLY) { /* inode was set s/uapnd */ 3096 error = EINVAL; 3097 goto done; 3098 } 3099 vp = (struct vnode *)fp->f_data; 3100 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3101 if (vp->v_type == VDIR) { 3102 error = EISDIR; 3103 } else if ((error = vn_writechk(vp, NULL)) == 0) { 3104 VATTR_NULL(&vattr); 3105 vattr.va_size = length; 3106 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 3107 } 3108 vn_unlock(vp); 3109 done: 3110 fdrop(fp); 3111 return (error); 3112 } 3113 3114 /* 3115 * ftruncate_args(int fd, int pad, off_t length) 3116 * 3117 * Truncate a file given a file descriptor. 3118 */ 3119 int 3120 sys_ftruncate(struct ftruncate_args *uap) 3121 { 3122 int error; 3123 3124 error = kern_ftruncate(uap->fd, uap->length); 3125 3126 return (error); 3127 } 3128 3129 /* 3130 * fsync(int fd) 3131 * 3132 * Sync an open file. 3133 */ 3134 /* ARGSUSED */ 3135 int 3136 sys_fsync(struct fsync_args *uap) 3137 { 3138 struct thread *td = curthread; 3139 struct proc *p = td->td_proc; 3140 struct vnode *vp; 3141 struct file *fp; 3142 vm_object_t obj; 3143 int error; 3144 3145 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) 3146 return (error); 3147 vp = (struct vnode *)fp->f_data; 3148 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3149 if ((obj = vp->v_object) != NULL) 3150 vm_object_page_clean(obj, 0, 0, 0); 3151 if ((error = VOP_FSYNC(vp, MNT_WAIT)) == 0 && vp->v_mount) 3152 error = buf_fsync(vp); 3153 vn_unlock(vp); 3154 fdrop(fp); 3155 return (error); 3156 } 3157 3158 int 3159 kern_rename(struct nlookupdata *fromnd, struct nlookupdata *tond) 3160 { 3161 struct nchandle fnchd; 3162 struct nchandle tnchd; 3163 struct namecache *ncp; 3164 struct vnode *fdvp; 3165 struct vnode *tdvp; 3166 struct mount *mp; 3167 int error; 3168 3169 bwillinode(1); 3170 fromnd->nl_flags |= NLC_REFDVP | NLC_RENAME_SRC; 3171 if ((error = nlookup(fromnd)) != 0) 3172 return (error); 3173 if ((fnchd.ncp = fromnd->nl_nch.ncp->nc_parent) == NULL) 3174 return (ENOENT); 3175 fnchd.mount = fromnd->nl_nch.mount; 3176 cache_hold(&fnchd); 3177 3178 /* 3179 * unlock the source nch so we can lookup the target nch without 3180 * deadlocking. The target may or may not exist so we do not check 3181 * for a target vp like kern_mkdir() and other creation functions do. 3182 * 3183 * The source and target directories are ref'd and rechecked after 3184 * everything is relocked to determine if the source or target file 3185 * has been renamed. 3186 */ 3187 KKASSERT(fromnd->nl_flags & NLC_NCPISLOCKED); 3188 fromnd->nl_flags &= ~NLC_NCPISLOCKED; 3189 cache_unlock(&fromnd->nl_nch); 3190 3191 tond->nl_flags |= NLC_RENAME_DST | NLC_REFDVP; 3192 if ((error = nlookup(tond)) != 0) { 3193 cache_drop(&fnchd); 3194 return (error); 3195 } 3196 if ((tnchd.ncp = tond->nl_nch.ncp->nc_parent) == NULL) { 3197 cache_drop(&fnchd); 3198 return (ENOENT); 3199 } 3200 tnchd.mount = tond->nl_nch.mount; 3201 cache_hold(&tnchd); 3202 3203 /* 3204 * If the source and target are the same there is nothing to do 3205 */ 3206 if (fromnd->nl_nch.ncp == tond->nl_nch.ncp) { 3207 cache_drop(&fnchd); 3208 cache_drop(&tnchd); 3209 return (0); 3210 } 3211 3212 /* 3213 * Mount points cannot be renamed or overwritten 3214 */ 3215 if ((fromnd->nl_nch.ncp->nc_flag | tond->nl_nch.ncp->nc_flag) & 3216 NCF_ISMOUNTPT 3217 ) { 3218 cache_drop(&fnchd); 3219 cache_drop(&tnchd); 3220 return (EINVAL); 3221 } 3222 3223 /* 3224 * relock the source ncp. NOTE AFTER RELOCKING: the source ncp 3225 * may have become invalid while it was unlocked, nc_vp and nc_mount 3226 * could be NULL. 3227 */ 3228 if (cache_lock_nonblock(&fromnd->nl_nch) == 0) { 3229 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred); 3230 } else if (fromnd->nl_nch.ncp > tond->nl_nch.ncp) { 3231 cache_lock(&fromnd->nl_nch); 3232 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred); 3233 } else { 3234 cache_unlock(&tond->nl_nch); 3235 cache_lock(&fromnd->nl_nch); 3236 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred); 3237 cache_lock(&tond->nl_nch); 3238 cache_resolve(&tond->nl_nch, tond->nl_cred); 3239 } 3240 fromnd->nl_flags |= NLC_NCPISLOCKED; 3241 3242 /* 3243 * make sure the parent directories linkages are the same 3244 */ 3245 if (fnchd.ncp != fromnd->nl_nch.ncp->nc_parent || 3246 tnchd.ncp != tond->nl_nch.ncp->nc_parent) { 3247 cache_drop(&fnchd); 3248 cache_drop(&tnchd); 3249 return (ENOENT); 3250 } 3251 3252 /* 3253 * Both the source and target must be within the same filesystem and 3254 * in the same filesystem as their parent directories within the 3255 * namecache topology. 3256 * 3257 * NOTE: fromnd's nc_mount or nc_vp could be NULL. 3258 */ 3259 mp = fnchd.mount; 3260 if (mp != tnchd.mount || mp != fromnd->nl_nch.mount || 3261 mp != tond->nl_nch.mount) { 3262 cache_drop(&fnchd); 3263 cache_drop(&tnchd); 3264 return (EXDEV); 3265 } 3266 3267 /* 3268 * Make sure the mount point is writable 3269 */ 3270 if ((error = ncp_writechk(&tond->nl_nch)) != 0) { 3271 cache_drop(&fnchd); 3272 cache_drop(&tnchd); 3273 return (error); 3274 } 3275 3276 /* 3277 * If the target exists and either the source or target is a directory, 3278 * then both must be directories. 3279 * 3280 * Due to relocking of the source, fromnd->nl_nch.ncp->nc_vp might h 3281 * have become NULL. 3282 */ 3283 if (tond->nl_nch.ncp->nc_vp) { 3284 if (fromnd->nl_nch.ncp->nc_vp == NULL) { 3285 error = ENOENT; 3286 } else if (fromnd->nl_nch.ncp->nc_vp->v_type == VDIR) { 3287 if (tond->nl_nch.ncp->nc_vp->v_type != VDIR) 3288 error = ENOTDIR; 3289 } else if (tond->nl_nch.ncp->nc_vp->v_type == VDIR) { 3290 error = EISDIR; 3291 } 3292 } 3293 3294 /* 3295 * You cannot rename a source into itself or a subdirectory of itself. 3296 * We check this by travsersing the target directory upwards looking 3297 * for a match against the source. 3298 */ 3299 if (error == 0) { 3300 for (ncp = tnchd.ncp; ncp; ncp = ncp->nc_parent) { 3301 if (fromnd->nl_nch.ncp == ncp) { 3302 error = EINVAL; 3303 break; 3304 } 3305 } 3306 } 3307 3308 cache_drop(&fnchd); 3309 cache_drop(&tnchd); 3310 3311 /* 3312 * Even though the namespaces are different, they may still represent 3313 * hardlinks to the same file. The filesystem might have a hard time 3314 * with this so we issue a NREMOVE of the source instead of a NRENAME 3315 * when we detect the situation. 3316 */ 3317 if (error == 0) { 3318 fdvp = fromnd->nl_dvp; 3319 tdvp = tond->nl_dvp; 3320 if (fdvp == NULL || tdvp == NULL) { 3321 error = EPERM; 3322 } else if (fromnd->nl_nch.ncp->nc_vp == tond->nl_nch.ncp->nc_vp) { 3323 error = VOP_NREMOVE(&fromnd->nl_nch, fdvp, 3324 fromnd->nl_cred); 3325 } else { 3326 error = VOP_NRENAME(&fromnd->nl_nch, &tond->nl_nch, 3327 fdvp, tdvp, tond->nl_cred); 3328 } 3329 } 3330 return (error); 3331 } 3332 3333 /* 3334 * rename_args(char *from, char *to) 3335 * 3336 * Rename files. Source and destination must either both be directories, 3337 * or both not be directories. If target is a directory, it must be empty. 3338 */ 3339 int 3340 sys_rename(struct rename_args *uap) 3341 { 3342 struct nlookupdata fromnd, tond; 3343 int error; 3344 3345 error = nlookup_init(&fromnd, uap->from, UIO_USERSPACE, 0); 3346 if (error == 0) { 3347 error = nlookup_init(&tond, uap->to, UIO_USERSPACE, 0); 3348 if (error == 0) 3349 error = kern_rename(&fromnd, &tond); 3350 nlookup_done(&tond); 3351 } 3352 nlookup_done(&fromnd); 3353 return (error); 3354 } 3355 3356 int 3357 kern_mkdir(struct nlookupdata *nd, int mode) 3358 { 3359 struct thread *td = curthread; 3360 struct proc *p = td->td_proc; 3361 struct vnode *vp; 3362 struct vattr vattr; 3363 int error; 3364 3365 bwillinode(1); 3366 nd->nl_flags |= NLC_WILLBEDIR | NLC_CREATE | NLC_REFDVP; 3367 if ((error = nlookup(nd)) != 0) 3368 return (error); 3369 3370 if (nd->nl_nch.ncp->nc_vp) 3371 return (EEXIST); 3372 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 3373 return (error); 3374 VATTR_NULL(&vattr); 3375 vattr.va_type = VDIR; 3376 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask; 3377 3378 vp = NULL; 3379 error = VOP_NMKDIR(&nd->nl_nch, nd->nl_dvp, &vp, p->p_ucred, &vattr); 3380 if (error == 0) 3381 vput(vp); 3382 return (error); 3383 } 3384 3385 /* 3386 * mkdir_args(char *path, int mode) 3387 * 3388 * Make a directory file. 3389 */ 3390 /* ARGSUSED */ 3391 int 3392 sys_mkdir(struct mkdir_args *uap) 3393 { 3394 struct nlookupdata nd; 3395 int error; 3396 3397 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 3398 if (error == 0) 3399 error = kern_mkdir(&nd, uap->mode); 3400 nlookup_done(&nd); 3401 return (error); 3402 } 3403 3404 int 3405 kern_rmdir(struct nlookupdata *nd) 3406 { 3407 int error; 3408 3409 bwillinode(1); 3410 nd->nl_flags |= NLC_DELETE | NLC_REFDVP; 3411 if ((error = nlookup(nd)) != 0) 3412 return (error); 3413 3414 /* 3415 * Do not allow directories representing mount points to be 3416 * deleted, even if empty. Check write perms on mount point 3417 * in case the vnode is aliased (aka nullfs). 3418 */ 3419 if (nd->nl_nch.ncp->nc_flag & (NCF_ISMOUNTPT)) 3420 return (EINVAL); 3421 if ((error = ncp_writechk(&nd->nl_nch)) != 0) 3422 return (error); 3423 error = VOP_NRMDIR(&nd->nl_nch, nd->nl_dvp, nd->nl_cred); 3424 return (error); 3425 } 3426 3427 /* 3428 * rmdir_args(char *path) 3429 * 3430 * Remove a directory file. 3431 */ 3432 /* ARGSUSED */ 3433 int 3434 sys_rmdir(struct rmdir_args *uap) 3435 { 3436 struct nlookupdata nd; 3437 int error; 3438 3439 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 3440 if (error == 0) 3441 error = kern_rmdir(&nd); 3442 nlookup_done(&nd); 3443 return (error); 3444 } 3445 3446 int 3447 kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res, 3448 enum uio_seg direction) 3449 { 3450 struct thread *td = curthread; 3451 struct proc *p = td->td_proc; 3452 struct vnode *vp; 3453 struct file *fp; 3454 struct uio auio; 3455 struct iovec aiov; 3456 off_t loff; 3457 int error, eofflag; 3458 3459 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) 3460 return (error); 3461 if ((fp->f_flag & FREAD) == 0) { 3462 error = EBADF; 3463 goto done; 3464 } 3465 vp = (struct vnode *)fp->f_data; 3466 unionread: 3467 if (vp->v_type != VDIR) { 3468 error = EINVAL; 3469 goto done; 3470 } 3471 aiov.iov_base = buf; 3472 aiov.iov_len = count; 3473 auio.uio_iov = &aiov; 3474 auio.uio_iovcnt = 1; 3475 auio.uio_rw = UIO_READ; 3476 auio.uio_segflg = direction; 3477 auio.uio_td = td; 3478 auio.uio_resid = count; 3479 loff = auio.uio_offset = fp->f_offset; 3480 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); 3481 fp->f_offset = auio.uio_offset; 3482 if (error) 3483 goto done; 3484 if (count == auio.uio_resid) { 3485 if (union_dircheckp) { 3486 error = union_dircheckp(td, &vp, fp); 3487 if (error == -1) 3488 goto unionread; 3489 if (error) 3490 goto done; 3491 } 3492 #if 0 3493 if ((vp->v_flag & VROOT) && 3494 (vp->v_mount->mnt_flag & MNT_UNION)) { 3495 struct vnode *tvp = vp; 3496 vp = vp->v_mount->mnt_vnodecovered; 3497 vref(vp); 3498 fp->f_data = vp; 3499 fp->f_offset = 0; 3500 vrele(tvp); 3501 goto unionread; 3502 } 3503 #endif 3504 } 3505 3506 /* 3507 * WARNING! *basep may not be wide enough to accomodate the 3508 * seek offset. XXX should we hack this to return the upper 32 bits 3509 * for offsets greater then 4G? 3510 */ 3511 if (basep) { 3512 *basep = (long)loff; 3513 } 3514 *res = count - auio.uio_resid; 3515 done: 3516 fdrop(fp); 3517 return (error); 3518 } 3519 3520 /* 3521 * getdirentries_args(int fd, char *buf, u_int conut, long *basep) 3522 * 3523 * Read a block of directory entries in a file system independent format. 3524 */ 3525 int 3526 sys_getdirentries(struct getdirentries_args *uap) 3527 { 3528 long base; 3529 int error; 3530 3531 error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base, 3532 &uap->sysmsg_result, UIO_USERSPACE); 3533 3534 if (error == 0 && uap->basep) 3535 error = copyout(&base, uap->basep, sizeof(*uap->basep)); 3536 return (error); 3537 } 3538 3539 /* 3540 * getdents_args(int fd, char *buf, size_t count) 3541 */ 3542 int 3543 sys_getdents(struct getdents_args *uap) 3544 { 3545 int error; 3546 3547 error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL, 3548 &uap->sysmsg_result, UIO_USERSPACE); 3549 3550 return (error); 3551 } 3552 3553 /* 3554 * umask(int newmask) 3555 * 3556 * Set the mode mask for creation of filesystem nodes. 3557 * 3558 * MP SAFE 3559 */ 3560 int 3561 sys_umask(struct umask_args *uap) 3562 { 3563 struct thread *td = curthread; 3564 struct proc *p = td->td_proc; 3565 struct filedesc *fdp; 3566 3567 fdp = p->p_fd; 3568 uap->sysmsg_result = fdp->fd_cmask; 3569 fdp->fd_cmask = uap->newmask & ALLPERMS; 3570 return (0); 3571 } 3572 3573 /* 3574 * revoke(char *path) 3575 * 3576 * Void all references to file by ripping underlying filesystem 3577 * away from vnode. 3578 */ 3579 /* ARGSUSED */ 3580 int 3581 sys_revoke(struct revoke_args *uap) 3582 { 3583 struct nlookupdata nd; 3584 struct vattr vattr; 3585 struct vnode *vp; 3586 struct ucred *cred; 3587 int error; 3588 3589 vp = NULL; 3590 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3591 if (error == 0) 3592 error = nlookup(&nd); 3593 if (error == 0) 3594 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp); 3595 cred = crhold(nd.nl_cred); 3596 nlookup_done(&nd); 3597 if (error == 0) { 3598 if (error == 0) 3599 error = VOP_GETATTR(vp, &vattr); 3600 if (error == 0 && cred->cr_uid != vattr.va_uid) 3601 error = priv_check_cred(cred, PRIV_ROOT, PRISON_ROOT); 3602 if (error == 0 && (vp->v_type == VCHR || vp->v_type == VBLK)) { 3603 if (count_udev(vp->v_umajor, vp->v_uminor) > 0) 3604 error = vrevoke(vp, cred); 3605 } else if (error == 0) { 3606 error = vrevoke(vp, cred); 3607 } 3608 vrele(vp); 3609 } 3610 if (cred) 3611 crfree(cred); 3612 return (error); 3613 } 3614 3615 /* 3616 * getfh_args(char *fname, fhandle_t *fhp) 3617 * 3618 * Get (NFS) file handle 3619 * 3620 * NOTE: We use the fsid of the covering mount, even if it is a nullfs 3621 * mount. This allows nullfs mounts to be explicitly exported. 3622 * 3623 * WARNING: nullfs mounts of HAMMER PFS ROOTs are safe. 3624 * 3625 * nullfs mounts of subdirectories are not safe. That is, it will 3626 * work, but you do not really have protection against access to 3627 * the related parent directories. 3628 */ 3629 int 3630 sys_getfh(struct getfh_args *uap) 3631 { 3632 struct thread *td = curthread; 3633 struct nlookupdata nd; 3634 fhandle_t fh; 3635 struct vnode *vp; 3636 struct mount *mp; 3637 int error; 3638 3639 /* 3640 * Must be super user 3641 */ 3642 if ((error = priv_check(td, PRIV_ROOT)) != 0) 3643 return (error); 3644 3645 vp = NULL; 3646 error = nlookup_init(&nd, uap->fname, UIO_USERSPACE, NLC_FOLLOW); 3647 if (error == 0) 3648 error = nlookup(&nd); 3649 if (error == 0) 3650 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 3651 mp = nd.nl_nch.mount; 3652 nlookup_done(&nd); 3653 if (error == 0) { 3654 bzero(&fh, sizeof(fh)); 3655 fh.fh_fsid = mp->mnt_stat.f_fsid; 3656 error = VFS_VPTOFH(vp, &fh.fh_fid); 3657 vput(vp); 3658 if (error == 0) 3659 error = copyout(&fh, uap->fhp, sizeof(fh)); 3660 } 3661 return (error); 3662 } 3663 3664 /* 3665 * fhopen_args(const struct fhandle *u_fhp, int flags) 3666 * 3667 * syscall for the rpc.lockd to use to translate a NFS file handle into 3668 * an open descriptor. 3669 * 3670 * warning: do not remove the priv_check() call or this becomes one giant 3671 * security hole. 3672 */ 3673 int 3674 sys_fhopen(struct fhopen_args *uap) 3675 { 3676 struct thread *td = curthread; 3677 struct proc *p = td->td_proc; 3678 struct mount *mp; 3679 struct vnode *vp; 3680 struct fhandle fhp; 3681 struct vattr vat; 3682 struct vattr *vap = &vat; 3683 struct flock lf; 3684 int fmode, mode, error, type; 3685 struct file *nfp; 3686 struct file *fp; 3687 int indx; 3688 3689 /* 3690 * Must be super user 3691 */ 3692 error = priv_check(td, PRIV_ROOT); 3693 if (error) 3694 return (error); 3695 3696 fmode = FFLAGS(uap->flags); 3697 /* why not allow a non-read/write open for our lockd? */ 3698 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 3699 return (EINVAL); 3700 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 3701 if (error) 3702 return(error); 3703 /* find the mount point */ 3704 mp = vfs_getvfs(&fhp.fh_fsid); 3705 if (mp == NULL) 3706 return (ESTALE); 3707 /* now give me my vnode, it gets returned to me locked */ 3708 error = VFS_FHTOVP(mp, NULL, &fhp.fh_fid, &vp); 3709 if (error) 3710 return (error); 3711 /* 3712 * from now on we have to make sure not 3713 * to forget about the vnode 3714 * any error that causes an abort must vput(vp) 3715 * just set error = err and 'goto bad;'. 3716 */ 3717 3718 /* 3719 * from vn_open 3720 */ 3721 if (vp->v_type == VLNK) { 3722 error = EMLINK; 3723 goto bad; 3724 } 3725 if (vp->v_type == VSOCK) { 3726 error = EOPNOTSUPP; 3727 goto bad; 3728 } 3729 mode = 0; 3730 if (fmode & (FWRITE | O_TRUNC)) { 3731 if (vp->v_type == VDIR) { 3732 error = EISDIR; 3733 goto bad; 3734 } 3735 error = vn_writechk(vp, NULL); 3736 if (error) 3737 goto bad; 3738 mode |= VWRITE; 3739 } 3740 if (fmode & FREAD) 3741 mode |= VREAD; 3742 if (mode) { 3743 error = VOP_ACCESS(vp, mode, p->p_ucred); 3744 if (error) 3745 goto bad; 3746 } 3747 if (fmode & O_TRUNC) { 3748 vn_unlock(vp); /* XXX */ 3749 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 3750 VATTR_NULL(vap); 3751 vap->va_size = 0; 3752 error = VOP_SETATTR(vp, vap, p->p_ucred); 3753 if (error) 3754 goto bad; 3755 } 3756 3757 /* 3758 * VOP_OPEN needs the file pointer so it can potentially override 3759 * it. 3760 * 3761 * WARNING! no f_nchandle will be associated when fhopen()ing a 3762 * directory. XXX 3763 */ 3764 if ((error = falloc(p, &nfp, &indx)) != 0) 3765 goto bad; 3766 fp = nfp; 3767 3768 error = VOP_OPEN(vp, fmode, p->p_ucred, fp); 3769 if (error) { 3770 /* 3771 * setting f_ops this way prevents VOP_CLOSE from being 3772 * called or fdrop() releasing the vp from v_data. Since 3773 * the VOP_OPEN failed we don't want to VOP_CLOSE. 3774 */ 3775 fp->f_ops = &badfileops; 3776 fp->f_data = NULL; 3777 goto bad_drop; 3778 } 3779 3780 /* 3781 * The fp is given its own reference, we still have our ref and lock. 3782 * 3783 * Assert that all regular files must be created with a VM object. 3784 */ 3785 if (vp->v_type == VREG && vp->v_object == NULL) { 3786 kprintf("fhopen: regular file did not have VM object: %p\n", vp); 3787 goto bad_drop; 3788 } 3789 3790 /* 3791 * The open was successful. Handle any locking requirements. 3792 */ 3793 if (fmode & (O_EXLOCK | O_SHLOCK)) { 3794 lf.l_whence = SEEK_SET; 3795 lf.l_start = 0; 3796 lf.l_len = 0; 3797 if (fmode & O_EXLOCK) 3798 lf.l_type = F_WRLCK; 3799 else 3800 lf.l_type = F_RDLCK; 3801 if (fmode & FNONBLOCK) 3802 type = 0; 3803 else 3804 type = F_WAIT; 3805 vn_unlock(vp); 3806 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { 3807 /* 3808 * release our private reference. 3809 */ 3810 fsetfd(p, NULL, indx); 3811 fdrop(fp); 3812 vrele(vp); 3813 return (error); 3814 } 3815 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3816 fp->f_flag |= FHASLOCK; 3817 } 3818 3819 /* 3820 * Clean up. Associate the file pointer with the previously 3821 * reserved descriptor and return it. 3822 */ 3823 vput(vp); 3824 fsetfd(p, fp, indx); 3825 fdrop(fp); 3826 uap->sysmsg_result = indx; 3827 return (0); 3828 3829 bad_drop: 3830 fsetfd(p, NULL, indx); 3831 fdrop(fp); 3832 bad: 3833 vput(vp); 3834 return (error); 3835 } 3836 3837 /* 3838 * fhstat_args(struct fhandle *u_fhp, struct stat *sb) 3839 */ 3840 int 3841 sys_fhstat(struct fhstat_args *uap) 3842 { 3843 struct thread *td = curthread; 3844 struct stat sb; 3845 fhandle_t fh; 3846 struct mount *mp; 3847 struct vnode *vp; 3848 int error; 3849 3850 /* 3851 * Must be super user 3852 */ 3853 error = priv_check(td, PRIV_ROOT); 3854 if (error) 3855 return (error); 3856 3857 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 3858 if (error) 3859 return (error); 3860 3861 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 3862 return (ESTALE); 3863 if ((error = VFS_FHTOVP(mp, NULL, &fh.fh_fid, &vp))) 3864 return (error); 3865 error = vn_stat(vp, &sb, td->td_proc->p_ucred); 3866 vput(vp); 3867 if (error) 3868 return (error); 3869 error = copyout(&sb, uap->sb, sizeof(sb)); 3870 return (error); 3871 } 3872 3873 /* 3874 * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf) 3875 */ 3876 int 3877 sys_fhstatfs(struct fhstatfs_args *uap) 3878 { 3879 struct thread *td = curthread; 3880 struct proc *p = td->td_proc; 3881 struct statfs *sp; 3882 struct mount *mp; 3883 struct vnode *vp; 3884 struct statfs sb; 3885 char *fullpath, *freepath; 3886 fhandle_t fh; 3887 int error; 3888 3889 /* 3890 * Must be super user 3891 */ 3892 if ((error = priv_check(td, PRIV_ROOT))) 3893 return (error); 3894 3895 if ((error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t))) != 0) 3896 return (error); 3897 3898 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 3899 return (ESTALE); 3900 3901 if (p != NULL && !chroot_visible_mnt(mp, p)) 3902 return (ESTALE); 3903 3904 if ((error = VFS_FHTOVP(mp, NULL, &fh.fh_fid, &vp))) 3905 return (error); 3906 mp = vp->v_mount; 3907 sp = &mp->mnt_stat; 3908 vput(vp); 3909 if ((error = VFS_STATFS(mp, sp, p->p_ucred)) != 0) 3910 return (error); 3911 3912 error = mount_path(p, mp, &fullpath, &freepath); 3913 if (error) 3914 return(error); 3915 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3916 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); 3917 kfree(freepath, M_TEMP); 3918 3919 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 3920 if (priv_check(td, PRIV_ROOT)) { 3921 bcopy(sp, &sb, sizeof(sb)); 3922 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 3923 sp = &sb; 3924 } 3925 return (copyout(sp, uap->buf, sizeof(*sp))); 3926 } 3927 3928 /* 3929 * fhstatvfs_args(struct fhandle *u_fhp, struct statvfs *buf) 3930 */ 3931 int 3932 sys_fhstatvfs(struct fhstatvfs_args *uap) 3933 { 3934 struct thread *td = curthread; 3935 struct proc *p = td->td_proc; 3936 struct statvfs *sp; 3937 struct mount *mp; 3938 struct vnode *vp; 3939 fhandle_t fh; 3940 int error; 3941 3942 /* 3943 * Must be super user 3944 */ 3945 if ((error = priv_check(td, PRIV_ROOT))) 3946 return (error); 3947 3948 if ((error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t))) != 0) 3949 return (error); 3950 3951 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 3952 return (ESTALE); 3953 3954 if (p != NULL && !chroot_visible_mnt(mp, p)) 3955 return (ESTALE); 3956 3957 if ((error = VFS_FHTOVP(mp, NULL, &fh.fh_fid, &vp))) 3958 return (error); 3959 mp = vp->v_mount; 3960 sp = &mp->mnt_vstat; 3961 vput(vp); 3962 if ((error = VFS_STATVFS(mp, sp, p->p_ucred)) != 0) 3963 return (error); 3964 3965 sp->f_flag = 0; 3966 if (mp->mnt_flag & MNT_RDONLY) 3967 sp->f_flag |= ST_RDONLY; 3968 if (mp->mnt_flag & MNT_NOSUID) 3969 sp->f_flag |= ST_NOSUID; 3970 3971 return (copyout(sp, uap->buf, sizeof(*sp))); 3972 } 3973 3974 3975 /* 3976 * Syscall to push extended attribute configuration information into the 3977 * VFS. Accepts a path, which it converts to a mountpoint, as well as 3978 * a command (int cmd), and attribute name and misc data. For now, the 3979 * attribute name is left in userspace for consumption by the VFS_op. 3980 * It will probably be changed to be copied into sysspace by the 3981 * syscall in the future, once issues with various consumers of the 3982 * attribute code have raised their hands. 3983 * 3984 * Currently this is used only by UFS Extended Attributes. 3985 */ 3986 int 3987 sys_extattrctl(struct extattrctl_args *uap) 3988 { 3989 struct nlookupdata nd; 3990 struct mount *mp; 3991 struct vnode *vp; 3992 int error; 3993 3994 vp = NULL; 3995 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3996 if (error == 0) 3997 error = nlookup(&nd); 3998 if (error == 0) { 3999 mp = nd.nl_nch.mount; 4000 error = VFS_EXTATTRCTL(mp, uap->cmd, 4001 uap->attrname, uap->arg, 4002 nd.nl_cred); 4003 } 4004 nlookup_done(&nd); 4005 return (error); 4006 } 4007 4008 /* 4009 * Syscall to set a named extended attribute on a file or directory. 4010 * Accepts attribute name, and a uio structure pointing to the data to set. 4011 * The uio is consumed in the style of writev(). The real work happens 4012 * in VOP_SETEXTATTR(). 4013 */ 4014 int 4015 sys_extattr_set_file(struct extattr_set_file_args *uap) 4016 { 4017 char attrname[EXTATTR_MAXNAMELEN]; 4018 struct iovec aiov[UIO_SMALLIOV]; 4019 struct iovec *needfree; 4020 struct nlookupdata nd; 4021 struct iovec *iov; 4022 struct vnode *vp; 4023 struct uio auio; 4024 u_int iovlen; 4025 u_int cnt; 4026 int error; 4027 int i; 4028 4029 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); 4030 if (error) 4031 return (error); 4032 4033 vp = NULL; 4034 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 4035 if (error == 0) 4036 error = nlookup(&nd); 4037 if (error == 0) 4038 error = ncp_writechk(&nd.nl_nch); 4039 if (error == 0) 4040 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 4041 if (error) { 4042 nlookup_done(&nd); 4043 return (error); 4044 } 4045 4046 needfree = NULL; 4047 iovlen = uap->iovcnt * sizeof(struct iovec); 4048 if (uap->iovcnt > UIO_SMALLIOV) { 4049 if (uap->iovcnt > UIO_MAXIOV) { 4050 error = EINVAL; 4051 goto done; 4052 } 4053 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 4054 needfree = iov; 4055 } else { 4056 iov = aiov; 4057 } 4058 auio.uio_iov = iov; 4059 auio.uio_iovcnt = uap->iovcnt; 4060 auio.uio_rw = UIO_WRITE; 4061 auio.uio_segflg = UIO_USERSPACE; 4062 auio.uio_td = nd.nl_td; 4063 auio.uio_offset = 0; 4064 if ((error = copyin(uap->iovp, iov, iovlen))) 4065 goto done; 4066 auio.uio_resid = 0; 4067 for (i = 0; i < uap->iovcnt; i++) { 4068 if (iov->iov_len > INT_MAX - auio.uio_resid) { 4069 error = EINVAL; 4070 goto done; 4071 } 4072 auio.uio_resid += iov->iov_len; 4073 iov++; 4074 } 4075 cnt = auio.uio_resid; 4076 error = VOP_SETEXTATTR(vp, attrname, &auio, nd.nl_cred); 4077 cnt -= auio.uio_resid; 4078 uap->sysmsg_result = cnt; 4079 done: 4080 vput(vp); 4081 nlookup_done(&nd); 4082 if (needfree) 4083 FREE(needfree, M_IOV); 4084 return (error); 4085 } 4086 4087 /* 4088 * Syscall to get a named extended attribute on a file or directory. 4089 * Accepts attribute name, and a uio structure pointing to a buffer for the 4090 * data. The uio is consumed in the style of readv(). The real work 4091 * happens in VOP_GETEXTATTR(); 4092 */ 4093 int 4094 sys_extattr_get_file(struct extattr_get_file_args *uap) 4095 { 4096 char attrname[EXTATTR_MAXNAMELEN]; 4097 struct iovec aiov[UIO_SMALLIOV]; 4098 struct iovec *needfree; 4099 struct nlookupdata nd; 4100 struct iovec *iov; 4101 struct vnode *vp; 4102 struct uio auio; 4103 u_int iovlen; 4104 u_int cnt; 4105 int error; 4106 int i; 4107 4108 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); 4109 if (error) 4110 return (error); 4111 4112 vp = NULL; 4113 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 4114 if (error == 0) 4115 error = nlookup(&nd); 4116 if (error == 0) 4117 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 4118 if (error) { 4119 nlookup_done(&nd); 4120 return (error); 4121 } 4122 4123 iovlen = uap->iovcnt * sizeof (struct iovec); 4124 needfree = NULL; 4125 if (uap->iovcnt > UIO_SMALLIOV) { 4126 if (uap->iovcnt > UIO_MAXIOV) { 4127 error = EINVAL; 4128 goto done; 4129 } 4130 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 4131 needfree = iov; 4132 } else { 4133 iov = aiov; 4134 } 4135 auio.uio_iov = iov; 4136 auio.uio_iovcnt = uap->iovcnt; 4137 auio.uio_rw = UIO_READ; 4138 auio.uio_segflg = UIO_USERSPACE; 4139 auio.uio_td = nd.nl_td; 4140 auio.uio_offset = 0; 4141 if ((error = copyin(uap->iovp, iov, iovlen))) 4142 goto done; 4143 auio.uio_resid = 0; 4144 for (i = 0; i < uap->iovcnt; i++) { 4145 if (iov->iov_len > INT_MAX - auio.uio_resid) { 4146 error = EINVAL; 4147 goto done; 4148 } 4149 auio.uio_resid += iov->iov_len; 4150 iov++; 4151 } 4152 cnt = auio.uio_resid; 4153 error = VOP_GETEXTATTR(vp, attrname, &auio, nd.nl_cred); 4154 cnt -= auio.uio_resid; 4155 uap->sysmsg_result = cnt; 4156 done: 4157 vput(vp); 4158 nlookup_done(&nd); 4159 if (needfree) 4160 FREE(needfree, M_IOV); 4161 return(error); 4162 } 4163 4164 /* 4165 * Syscall to delete a named extended attribute from a file or directory. 4166 * Accepts attribute name. The real work happens in VOP_SETEXTATTR(). 4167 */ 4168 int 4169 sys_extattr_delete_file(struct extattr_delete_file_args *uap) 4170 { 4171 char attrname[EXTATTR_MAXNAMELEN]; 4172 struct nlookupdata nd; 4173 struct vnode *vp; 4174 int error; 4175 4176 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); 4177 if (error) 4178 return(error); 4179 4180 vp = NULL; 4181 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 4182 if (error == 0) 4183 error = nlookup(&nd); 4184 if (error == 0) 4185 error = ncp_writechk(&nd.nl_nch); 4186 if (error == 0) 4187 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 4188 if (error) { 4189 nlookup_done(&nd); 4190 return (error); 4191 } 4192 4193 error = VOP_SETEXTATTR(vp, attrname, NULL, nd.nl_cred); 4194 vput(vp); 4195 nlookup_done(&nd); 4196 return(error); 4197 } 4198 4199 /* 4200 * Determine if the mount is visible to the process. 4201 */ 4202 static int 4203 chroot_visible_mnt(struct mount *mp, struct proc *p) 4204 { 4205 struct nchandle nch; 4206 4207 /* 4208 * Traverse from the mount point upwards. If we hit the process 4209 * root then the mount point is visible to the process. 4210 */ 4211 nch = mp->mnt_ncmountpt; 4212 while (nch.ncp) { 4213 if (nch.mount == p->p_fd->fd_nrdir.mount && 4214 nch.ncp == p->p_fd->fd_nrdir.ncp) { 4215 return(1); 4216 } 4217 if (nch.ncp == nch.mount->mnt_ncmountpt.ncp) { 4218 nch = nch.mount->mnt_ncmounton; 4219 } else { 4220 nch.ncp = nch.ncp->nc_parent; 4221 } 4222 } 4223 4224 /* 4225 * If the mount point is not visible to the process, but the 4226 * process root is in a subdirectory of the mount, return 4227 * TRUE anyway. 4228 */ 4229 if (p->p_fd->fd_nrdir.mount == mp) 4230 return(1); 4231 4232 return(0); 4233 } 4234 4235