vfs_syscalls.c revision 1.319
1 /* $NetBSD: vfs_syscalls.c,v 1.319 2007/06/16 20:48:04 dsl Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.319 2007/06/16 20:48:04 dsl Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 #include "opt_compat_43.h" 44 #include "opt_fileassoc.h" 45 #include "opt_ktrace.h" 46 #include "fss.h" 47 #include "veriexec.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/namei.h> 52 #include <sys/filedesc.h> 53 #include <sys/kernel.h> 54 #include <sys/file.h> 55 #include <sys/stat.h> 56 #include <sys/vnode.h> 57 #include <sys/mount.h> 58 #include <sys/proc.h> 59 #include <sys/uio.h> 60 #include <sys/malloc.h> 61 #include <sys/kmem.h> 62 #include <sys/dirent.h> 63 #include <sys/sysctl.h> 64 #include <sys/syscallargs.h> 65 #include <sys/vfs_syscalls.h> 66 #ifdef KTRACE 67 #include <sys/ktrace.h> 68 #endif 69 #ifdef FILEASSOC 70 #include <sys/fileassoc.h> 71 #endif /* FILEASSOC */ 72 #include <sys/verified_exec.h> 73 #include <sys/kauth.h> 74 75 #include <miscfs/genfs/genfs.h> 76 #include <miscfs/syncfs/syncfs.h> 77 78 #ifdef COMPAT_30 79 #include "opt_nfsserver.h" 80 #include <nfs/rpcv2.h> 81 #endif 82 #include <nfs/nfsproto.h> 83 #ifdef COMPAT_30 84 #include <nfs/nfs.h> 85 #include <nfs/nfs_var.h> 86 #endif 87 88 #if NFSS > 0 89 #include <dev/fssvar.h> 90 #endif 91 92 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 93 94 static int change_dir(struct nameidata *, struct lwp *); 95 static int change_flags(struct vnode *, u_long, struct lwp *); 96 static int change_mode(struct vnode *, int, struct lwp *l); 97 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); 98 static int rename_files(const char *, const char *, struct lwp *, int); 99 100 void checkdirs(struct vnode *); 101 102 int dovfsusermount = 0; 103 104 /* 105 * Virtual File System System Calls 106 */ 107 108 /* 109 * Mount a file system. 110 */ 111 112 #if defined(COMPAT_09) || defined(COMPAT_43) 113 /* 114 * This table is used to maintain compatibility with 4.3BSD 115 * and NetBSD 0.9 mount syscalls. Note, the order is important! 116 * 117 * Do not modify this table. It should only contain filesystems 118 * supported by NetBSD 0.9 and 4.3BSD. 119 */ 120 const char * const mountcompatnames[] = { 121 NULL, /* 0 = MOUNT_NONE */ 122 MOUNT_FFS, /* 1 = MOUNT_UFS */ 123 MOUNT_NFS, /* 2 */ 124 MOUNT_MFS, /* 3 */ 125 MOUNT_MSDOS, /* 4 */ 126 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 127 MOUNT_FDESC, /* 6 */ 128 MOUNT_KERNFS, /* 7 */ 129 NULL, /* 8 = MOUNT_DEVFS */ 130 MOUNT_AFS, /* 9 */ 131 }; 132 const int nmountcompatnames = sizeof(mountcompatnames) / 133 sizeof(mountcompatnames[0]); 134 #endif /* COMPAT_09 || COMPAT_43 */ 135 136 static int 137 mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags, 138 void *data, struct nameidata *ndp) 139 { 140 struct mount *mp; 141 int error = 0, saved_flags; 142 143 mp = vp->v_mount; 144 saved_flags = mp->mnt_flag; 145 146 /* We can operate only on VROOT nodes. */ 147 if ((vp->v_flag & VROOT) == 0) { 148 error = EINVAL; 149 goto out; 150 } 151 152 /* 153 * We only allow the filesystem to be reloaded if it 154 * is currently mounted read-only. 155 */ 156 if (flags & MNT_RELOAD && !(mp->mnt_flag & MNT_RDONLY)) { 157 error = EOPNOTSUPP; /* Needs translation */ 158 goto out; 159 } 160 161 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 162 KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data); 163 if (error) 164 goto out; 165 166 if (vfs_busy(mp, LK_NOWAIT, 0)) { 167 error = EPERM; 168 goto out; 169 } 170 171 mp->mnt_flag &= ~MNT_OP_FLAGS; 172 mp->mnt_flag |= flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 173 174 /* 175 * Set the mount level flags. 176 */ 177 if (flags & MNT_RDONLY) 178 mp->mnt_flag |= MNT_RDONLY; 179 else if (mp->mnt_flag & MNT_RDONLY) 180 mp->mnt_iflag |= IMNT_WANTRDWR; 181 mp->mnt_flag &= 182 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 183 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 184 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 185 mp->mnt_flag |= flags & 186 (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 187 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 188 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 189 MNT_IGNORE); 190 191 error = VFS_MOUNT(mp, path, data, ndp, l); 192 193 #if defined(COMPAT_30) && defined(NFSSERVER) 194 if (error) { 195 int error2; 196 197 /* Update failed; let's try and see if it was an 198 * export request. */ 199 error2 = nfs_update_exports_30(mp, path, data, l); 200 201 /* Only update error code if the export request was 202 * understood but some problem occurred while 203 * processing it. */ 204 if (error2 != EJUSTRETURN) 205 error = error2; 206 } 207 #endif 208 if (mp->mnt_iflag & IMNT_WANTRDWR) 209 mp->mnt_flag &= ~MNT_RDONLY; 210 if (error) 211 mp->mnt_flag = saved_flags; 212 mp->mnt_flag &= ~MNT_OP_FLAGS; 213 mp->mnt_iflag &= ~IMNT_WANTRDWR; 214 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 215 if (mp->mnt_syncer == NULL) 216 error = vfs_allocate_syncvnode(mp); 217 } else { 218 if (mp->mnt_syncer != NULL) 219 vfs_deallocate_syncvnode(mp); 220 } 221 vfs_unbusy(mp); 222 223 out: 224 return (error); 225 } 226 227 static int 228 mount_domount(struct lwp *l, struct vnode *vp, const char *fstype, 229 const char *path, int flags, void *data, struct nameidata *ndp) 230 { 231 struct mount *mp = NULL; 232 struct vattr va; 233 char fstypename[MFSNAMELEN]; 234 int error; 235 236 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 237 KAUTH_REQ_SYSTEM_MOUNT_NEW, vp, KAUTH_ARG(flags), data); 238 if (error) { 239 vput(vp); 240 goto out; 241 } 242 243 /* Can't make a non-dir a mount-point (from here anyway). */ 244 if (vp->v_type != VDIR) { 245 error = ENOTDIR; 246 vput(vp); 247 goto out; 248 } 249 250 /* 251 * If the user is not root, ensure that they own the directory 252 * onto which we are attempting to mount. 253 */ 254 if ((error = VOP_GETATTR(vp, &va, l->l_cred, l)) != 0 || 255 (va.va_uid != kauth_cred_geteuid(l->l_cred) && 256 (error = kauth_authorize_generic(l->l_cred, 257 KAUTH_GENERIC_ISSUSER, NULL)) != 0)) { 258 vput(vp); 259 goto out; 260 } 261 262 if (flags & MNT_EXPORTED) { 263 error = EINVAL; 264 vput(vp); 265 goto out; 266 } 267 268 /* 269 * Copy file-system type from userspace. 270 */ 271 error = copyinstr(fstype, fstypename, MFSNAMELEN, NULL); 272 if (error) { 273 #if defined(COMPAT_09) || defined(COMPAT_43) 274 /* 275 * Historically, filesystem types were identified by numbers. 276 * If we get an integer for the filesystem type instead of a 277 * string, we check to see if it matches one of the historic 278 * filesystem types. 279 */ 280 u_long fsindex = (u_long)fstype; 281 if (fsindex >= nmountcompatnames || 282 mountcompatnames[fsindex] == NULL) { 283 error = ENODEV; 284 vput(vp); 285 goto out; 286 } 287 strlcpy(fstypename, mountcompatnames[fsindex], sizeof(fstypename)); 288 #else 289 vput(vp); 290 goto out; 291 #endif 292 } 293 294 #ifdef COMPAT_10 295 /* Accept `ufs' as an alias for `ffs'. */ 296 if (strncmp(fstypename, "ufs", MFSNAMELEN) == 0) 297 strlcpy(fstypename, "ffs", sizeof(fstypename)); 298 #endif 299 300 if ((error = vinvalbuf(vp, V_SAVE, l->l_cred, l, 0, 0)) != 0) { 301 vput(vp); 302 goto out; 303 } 304 305 /* 306 * Check if a file-system is not already mounted on this vnode. 307 */ 308 if (vp->v_mountedhere != NULL) { 309 error = EBUSY; 310 vput(vp); 311 goto out; 312 } 313 314 mp = malloc(sizeof(*mp), M_MOUNT, M_WAITOK|M_ZERO); 315 316 if ((mp->mnt_op = vfs_getopsbyname(fstypename)) == NULL) { 317 free(mp, M_MOUNT); 318 error = ENODEV; 319 vput(vp); 320 goto out; 321 } 322 323 TAILQ_INIT(&mp->mnt_vnodelist); 324 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 325 simple_lock_init(&mp->mnt_slock); 326 (void)vfs_busy(mp, LK_NOWAIT, 0); 327 328 mp->mnt_op->vfs_refcount++; 329 mp->mnt_vnodecovered = vp; 330 mp->mnt_stat.f_owner = kauth_cred_geteuid(l->l_cred); 331 mp->mnt_unmounter = NULL; 332 mount_initspecific(mp); 333 334 /* 335 * The underlying file system may refuse the mount for 336 * various reasons. Allow the user to force it to happen. 337 * 338 * Set the mount level flags. 339 */ 340 mp->mnt_flag = flags & 341 (MNT_FORCE | MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 342 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 343 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 344 MNT_IGNORE | MNT_RDONLY); 345 346 error = VFS_MOUNT(mp, path, data, ndp, l); 347 mp->mnt_flag &= ~MNT_OP_FLAGS; 348 349 /* 350 * Put the new filesystem on the mount list after root. 351 */ 352 cache_purge(vp); 353 if (!error) { 354 mp->mnt_iflag &= ~IMNT_WANTRDWR; 355 vp->v_mountedhere = mp; 356 simple_lock(&mountlist_slock); 357 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 358 simple_unlock(&mountlist_slock); 359 VOP_UNLOCK(vp, 0); 360 checkdirs(vp); 361 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 362 error = vfs_allocate_syncvnode(mp); 363 vfs_unbusy(mp); 364 (void) VFS_STATVFS(mp, &mp->mnt_stat, l); 365 error = VFS_START(mp, 0, l); 366 if (error) 367 vrele(vp); 368 } else { 369 vp->v_mountedhere = NULL; 370 mp->mnt_op->vfs_refcount--; 371 vfs_unbusy(mp); 372 free(mp, M_MOUNT); 373 vput(vp); 374 } 375 376 out: 377 return (error); 378 } 379 380 static int 381 mount_getargs(struct lwp *l, struct vnode *vp, const char *path, int flags, 382 void *data, struct nameidata *ndp) 383 { 384 struct mount *mp; 385 int error; 386 387 /* If MNT_GETARGS is specified, it should be the only flag. */ 388 if (flags & ~MNT_GETARGS) { 389 error = EINVAL; 390 goto out; 391 } 392 393 mp = vp->v_mount; 394 395 /* XXX: probably some notion of "can see" here if we want isolation. */ 396 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 397 KAUTH_REQ_SYSTEM_MOUNT_GET, mp, data, NULL); 398 if (error) 399 goto out; 400 401 if ((vp->v_flag & VROOT) == 0) { 402 error = EINVAL; 403 goto out; 404 } 405 406 if (vfs_busy(mp, LK_NOWAIT, 0)) { 407 error = EPERM; 408 goto out; 409 } 410 411 mp->mnt_flag &= ~MNT_OP_FLAGS; 412 mp->mnt_flag |= MNT_GETARGS; 413 error = VFS_MOUNT(mp, path, data, ndp, l); 414 mp->mnt_flag &= ~MNT_OP_FLAGS; 415 416 vfs_unbusy(mp); 417 out: 418 return (error); 419 } 420 421 /* ARGSUSED */ 422 int 423 sys_mount(struct lwp *l, void *v, register_t *retval) 424 { 425 struct sys_mount_args /* { 426 syscallarg(const char *) type; 427 syscallarg(const char *) path; 428 syscallarg(int) flags; 429 syscallarg(void *) data; 430 } */ *uap = v; 431 struct vnode *vp; 432 struct nameidata nd; 433 int error; 434 435 /* 436 * Get vnode to be covered 437 */ 438 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, 439 SCARG(uap, path), l); 440 if ((error = namei(&nd)) != 0) 441 return (error); 442 vp = nd.ni_vp; 443 444 /* 445 * A lookup in VFS_MOUNT might result in an attempt to 446 * lock this vnode again, so make the lock recursive. 447 */ 448 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 449 450 if (SCARG(uap, flags) & MNT_GETARGS) { 451 error = mount_getargs(l, vp, SCARG(uap, path), 452 SCARG(uap, flags), SCARG(uap, data), &nd); 453 vput(vp); 454 } else if (SCARG(uap, flags) & MNT_UPDATE) { 455 error = mount_update(l, vp, SCARG(uap, path), 456 SCARG(uap, flags), SCARG(uap, data), &nd); 457 vput(vp); 458 } else { 459 /* Locking is handled internally in mount_domount(). */ 460 error = mount_domount(l, vp, SCARG(uap, type), 461 SCARG(uap, path), SCARG(uap, flags), SCARG(uap, data), &nd); 462 } 463 464 return (error); 465 } 466 467 /* 468 * Scan all active processes to see if any of them have a current 469 * or root directory onto which the new filesystem has just been 470 * mounted. If so, replace them with the new mount point. 471 */ 472 void 473 checkdirs(struct vnode *olddp) 474 { 475 struct cwdinfo *cwdi; 476 struct vnode *newdp; 477 struct proc *p; 478 479 if (olddp->v_usecount == 1) 480 return; 481 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 482 panic("mount: lost mount"); 483 mutex_enter(&proclist_lock); 484 PROCLIST_FOREACH(p, &allproc) { 485 cwdi = p->p_cwdi; 486 if (!cwdi) 487 continue; 488 if (cwdi->cwdi_cdir == olddp) { 489 vrele(cwdi->cwdi_cdir); 490 VREF(newdp); 491 cwdi->cwdi_cdir = newdp; 492 } 493 if (cwdi->cwdi_rdir == olddp) { 494 vrele(cwdi->cwdi_rdir); 495 VREF(newdp); 496 cwdi->cwdi_rdir = newdp; 497 } 498 } 499 mutex_exit(&proclist_lock); 500 if (rootvnode == olddp) { 501 vrele(rootvnode); 502 VREF(newdp); 503 rootvnode = newdp; 504 } 505 vput(newdp); 506 } 507 508 /* 509 * Unmount a file system. 510 * 511 * Note: unmount takes a path to the vnode mounted on as argument, 512 * not special file (as before). 513 */ 514 /* ARGSUSED */ 515 int 516 sys_unmount(struct lwp *l, void *v, register_t *retval) 517 { 518 struct sys_unmount_args /* { 519 syscallarg(const char *) path; 520 syscallarg(int) flags; 521 } */ *uap = v; 522 struct vnode *vp; 523 struct mount *mp; 524 int error; 525 struct nameidata nd; 526 527 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 528 SCARG(uap, path), l); 529 if ((error = namei(&nd)) != 0) 530 return (error); 531 vp = nd.ni_vp; 532 mp = vp->v_mount; 533 534 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 535 KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT, mp, NULL, NULL); 536 if (error) { 537 vput(vp); 538 return (error); 539 } 540 541 /* 542 * Don't allow unmounting the root file system. 543 */ 544 if (mp->mnt_flag & MNT_ROOTFS) { 545 vput(vp); 546 return (EINVAL); 547 } 548 549 /* 550 * Must be the root of the filesystem 551 */ 552 if ((vp->v_flag & VROOT) == 0) { 553 vput(vp); 554 return (EINVAL); 555 } 556 vput(vp); 557 558 /* 559 * XXX Freeze syncer. Must do this before locking the 560 * mount point. See dounmount() for details. 561 */ 562 mutex_enter(&syncer_mutex); 563 564 if (vfs_busy(mp, 0, 0)) { 565 mutex_exit(&syncer_mutex); 566 return (EBUSY); 567 } 568 569 return (dounmount(mp, SCARG(uap, flags), l)); 570 } 571 572 /* 573 * Do the actual file system unmount. File system is assumed to have been 574 * marked busy by the caller. 575 */ 576 int 577 dounmount(struct mount *mp, int flags, struct lwp *l) 578 { 579 struct vnode *coveredvp; 580 int error; 581 int async; 582 int used_syncer; 583 584 #if NVERIEXEC > 0 585 error = veriexec_unmountchk(mp); 586 if (error) 587 return (error); 588 #endif /* NVERIEXEC > 0 */ 589 590 simple_lock(&mountlist_slock); 591 vfs_unbusy(mp); 592 used_syncer = (mp->mnt_syncer != NULL); 593 594 /* 595 * XXX Syncer must be frozen when we get here. This should really 596 * be done on a per-mountpoint basis, but especially the softdep 597 * code possibly called from the syncer doesn't exactly work on a 598 * per-mountpoint basis, so the softdep code would become a maze 599 * of vfs_busy() calls. 600 * 601 * The caller of dounmount() must acquire syncer_mutex because 602 * the syncer itself acquires locks in syncer_mutex -> vfs_busy 603 * order, and we must preserve that order to avoid deadlock. 604 * 605 * So, if the file system did not use the syncer, now is 606 * the time to release the syncer_mutex. 607 */ 608 if (used_syncer == 0) 609 mutex_exit(&syncer_mutex); 610 611 mp->mnt_iflag |= IMNT_UNMOUNT; 612 mp->mnt_unmounter = l; 613 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 614 615 async = mp->mnt_flag & MNT_ASYNC; 616 mp->mnt_flag &= ~MNT_ASYNC; 617 cache_purgevfs(mp); /* remove cache entries for this file sys */ 618 if (mp->mnt_syncer != NULL) 619 vfs_deallocate_syncvnode(mp); 620 error = 0; 621 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 622 #if NFSS > 0 623 error = fss_umount_hook(mp, (flags & MNT_FORCE)); 624 #endif 625 if (error == 0) 626 error = VFS_SYNC(mp, MNT_WAIT, l->l_cred, l); 627 } 628 if (error == 0 || (flags & MNT_FORCE)) 629 error = VFS_UNMOUNT(mp, flags, l); 630 if (error) { 631 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 632 (void) vfs_allocate_syncvnode(mp); 633 simple_lock(&mountlist_slock); 634 mp->mnt_iflag &= ~IMNT_UNMOUNT; 635 mp->mnt_unmounter = NULL; 636 mp->mnt_flag |= async; 637 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 638 &mountlist_slock); 639 if (used_syncer) 640 mutex_exit(&syncer_mutex); 641 simple_lock(&mp->mnt_slock); 642 while (mp->mnt_wcnt > 0) { 643 wakeup(mp); 644 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 645 0, &mp->mnt_slock); 646 } 647 simple_unlock(&mp->mnt_slock); 648 return (error); 649 } 650 simple_lock(&mountlist_slock); 651 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 652 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) 653 coveredvp->v_mountedhere = NULL; 654 mp->mnt_op->vfs_refcount--; 655 if (TAILQ_FIRST(&mp->mnt_vnodelist) != NULL) 656 panic("unmount: dangling vnode"); 657 mp->mnt_iflag |= IMNT_GONE; 658 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 659 if (coveredvp != NULLVP) 660 vrele(coveredvp); 661 mount_finispecific(mp); 662 if (used_syncer) 663 mutex_exit(&syncer_mutex); 664 simple_lock(&mp->mnt_slock); 665 while (mp->mnt_wcnt > 0) { 666 wakeup(mp); 667 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0, &mp->mnt_slock); 668 } 669 simple_unlock(&mp->mnt_slock); 670 vfs_hooks_unmount(mp); 671 free(mp, M_MOUNT); 672 return (0); 673 } 674 675 /* 676 * Sync each mounted filesystem. 677 */ 678 #ifdef DEBUG 679 int syncprt = 0; 680 struct ctldebug debug0 = { "syncprt", &syncprt }; 681 #endif 682 683 /* ARGSUSED */ 684 int 685 sys_sync(struct lwp *l, void *v, register_t *retval) 686 { 687 struct mount *mp, *nmp; 688 int asyncflag; 689 690 if (l == NULL) 691 l = &lwp0; 692 693 simple_lock(&mountlist_slock); 694 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 695 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 696 nmp = mp->mnt_list.cqe_prev; 697 continue; 698 } 699 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 700 asyncflag = mp->mnt_flag & MNT_ASYNC; 701 mp->mnt_flag &= ~MNT_ASYNC; 702 VFS_SYNC(mp, MNT_NOWAIT, l->l_cred, l); 703 if (asyncflag) 704 mp->mnt_flag |= MNT_ASYNC; 705 } 706 simple_lock(&mountlist_slock); 707 nmp = mp->mnt_list.cqe_prev; 708 vfs_unbusy(mp); 709 710 } 711 simple_unlock(&mountlist_slock); 712 #ifdef DEBUG 713 if (syncprt) 714 vfs_bufstats(); 715 #endif /* DEBUG */ 716 return (0); 717 } 718 719 /* 720 * Change filesystem quotas. 721 */ 722 /* ARGSUSED */ 723 int 724 sys_quotactl(struct lwp *l, void *v, register_t *retval) 725 { 726 struct sys_quotactl_args /* { 727 syscallarg(const char *) path; 728 syscallarg(int) cmd; 729 syscallarg(int) uid; 730 syscallarg(void *) arg; 731 } */ *uap = v; 732 struct mount *mp; 733 int error; 734 struct nameidata nd; 735 736 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 737 if ((error = namei(&nd)) != 0) 738 return (error); 739 mp = nd.ni_vp->v_mount; 740 vrele(nd.ni_vp); 741 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 742 SCARG(uap, arg), l); 743 return (error); 744 } 745 746 int 747 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 748 int root) 749 { 750 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 751 int error = 0; 752 753 /* 754 * If MNT_NOWAIT or MNT_LAZY is specified, do not 755 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 756 * overrides MNT_NOWAIT. 757 */ 758 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 759 (flags != MNT_WAIT && flags != 0)) { 760 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 761 goto done; 762 } 763 764 /* Get the filesystem stats now */ 765 memset(sp, 0, sizeof(*sp)); 766 if ((error = VFS_STATVFS(mp, sp, l)) != 0) { 767 return error; 768 } 769 770 if (cwdi->cwdi_rdir == NULL) 771 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 772 done: 773 if (cwdi->cwdi_rdir != NULL) { 774 size_t len; 775 char *bp; 776 char *path = PNBUF_GET(); 777 778 bp = path + MAXPATHLEN; 779 *--bp = '\0'; 780 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 781 MAXPATHLEN / 2, 0, l); 782 if (error) { 783 PNBUF_PUT(path); 784 return error; 785 } 786 len = strlen(bp); 787 /* 788 * for mount points that are below our root, we can see 789 * them, so we fix up the pathname and return them. The 790 * rest we cannot see, so we don't allow viewing the 791 * data. 792 */ 793 if (strncmp(bp, sp->f_mntonname, len) == 0) { 794 strlcpy(sp->f_mntonname, &sp->f_mntonname[len], 795 sizeof(sp->f_mntonname)); 796 if (sp->f_mntonname[0] == '\0') 797 (void)strlcpy(sp->f_mntonname, "/", 798 sizeof(sp->f_mntonname)); 799 } else { 800 if (root) 801 (void)strlcpy(sp->f_mntonname, "/", 802 sizeof(sp->f_mntonname)); 803 else 804 error = EPERM; 805 } 806 PNBUF_PUT(path); 807 } 808 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 809 return error; 810 } 811 812 /* 813 * Get filesystem statistics by path. 814 */ 815 int 816 do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb) 817 { 818 struct mount *mp; 819 int error; 820 struct nameidata nd; 821 822 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, path, l); 823 if ((error = namei(&nd)) != 0) 824 return error; 825 mp = nd.ni_vp->v_mount; 826 error = dostatvfs(mp, sb, l, flags, 1); 827 vrele(nd.ni_vp); 828 return error; 829 } 830 831 /* ARGSUSED */ 832 int 833 sys_statvfs1(struct lwp *l, void *v, register_t *retval) 834 { 835 struct sys_statvfs1_args /* { 836 syscallarg(const char *) path; 837 syscallarg(struct statvfs *) buf; 838 syscallarg(int) flags; 839 } */ *uap = v; 840 struct statvfs *sb; 841 int error; 842 843 sb = STATVFSBUF_GET(); 844 error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb); 845 if (error == 0) 846 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 847 STATVFSBUF_PUT(sb); 848 return error; 849 } 850 851 /* 852 * Get filesystem statistics by fd. 853 */ 854 int 855 do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb) 856 { 857 struct proc *p = l->l_proc; 858 struct file *fp; 859 struct mount *mp; 860 int error; 861 862 /* getvnode() will use the descriptor for us */ 863 if ((error = getvnode(p->p_fd, fd, &fp)) != 0) 864 return (error); 865 mp = ((struct vnode *)fp->f_data)->v_mount; 866 error = dostatvfs(mp, sb, l, flags, 1); 867 FILE_UNUSE(fp, l); 868 return error; 869 } 870 871 /* ARGSUSED */ 872 int 873 sys_fstatvfs1(struct lwp *l, void *v, register_t *retval) 874 { 875 struct sys_fstatvfs1_args /* { 876 syscallarg(int) fd; 877 syscallarg(struct statvfs *) buf; 878 syscallarg(int) flags; 879 } */ *uap = v; 880 struct statvfs *sb; 881 int error; 882 883 sb = STATVFSBUF_GET(); 884 error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb); 885 if (error == 0) 886 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 887 STATVFSBUF_PUT(sb); 888 return error; 889 } 890 891 892 /* 893 * Get statistics on all filesystems. 894 */ 895 int 896 do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags, 897 int (*copyfn)(const void *, void *, size_t), size_t entry_sz, 898 register_t *retval) 899 { 900 int root = 0; 901 struct proc *p = l->l_proc; 902 struct mount *mp, *nmp; 903 struct statvfs *sb; 904 size_t count, maxcount; 905 int error = 0; 906 907 sb = STATVFSBUF_GET(); 908 maxcount = bufsize / entry_sz; 909 simple_lock(&mountlist_slock); 910 count = 0; 911 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 912 mp = nmp) { 913 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 914 nmp = CIRCLEQ_NEXT(mp, mnt_list); 915 continue; 916 } 917 if (sfsp && count < maxcount) { 918 error = dostatvfs(mp, sb, l, flags, 0); 919 if (error) { 920 simple_lock(&mountlist_slock); 921 nmp = CIRCLEQ_NEXT(mp, mnt_list); 922 vfs_unbusy(mp); 923 continue; 924 } 925 error = copyfn(sb, sfsp, entry_sz); 926 if (error) { 927 vfs_unbusy(mp); 928 goto out; 929 } 930 sfsp = (char *)sfsp + entry_sz; 931 root |= strcmp(sb->f_mntonname, "/") == 0; 932 } 933 count++; 934 simple_lock(&mountlist_slock); 935 nmp = CIRCLEQ_NEXT(mp, mnt_list); 936 vfs_unbusy(mp); 937 } 938 simple_unlock(&mountlist_slock); 939 if (root == 0 && p->p_cwdi->cwdi_rdir) { 940 /* 941 * fake a root entry 942 */ 943 error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, sb, l, flags, 1); 944 if (error != 0) 945 goto out; 946 if (sfsp) 947 error = copyfn(sb, sfsp, entry_sz); 948 count++; 949 } 950 if (sfsp && count > maxcount) 951 *retval = maxcount; 952 else 953 *retval = count; 954 out: 955 STATVFSBUF_PUT(sb); 956 return error; 957 } 958 959 int 960 sys_getvfsstat(struct lwp *l, void *v, register_t *retval) 961 { 962 struct sys_getvfsstat_args /* { 963 syscallarg(struct statvfs *) buf; 964 syscallarg(size_t) bufsize; 965 syscallarg(int) flags; 966 } */ *uap = v; 967 968 return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize), 969 SCARG(uap, flags), copyout, sizeof (struct statvfs), retval); 970 } 971 972 /* 973 * Change current working directory to a given file descriptor. 974 */ 975 /* ARGSUSED */ 976 int 977 sys_fchdir(struct lwp *l, void *v, register_t *retval) 978 { 979 struct sys_fchdir_args /* { 980 syscallarg(int) fd; 981 } */ *uap = v; 982 struct proc *p = l->l_proc; 983 struct filedesc *fdp = p->p_fd; 984 struct cwdinfo *cwdi = p->p_cwdi; 985 struct vnode *vp, *tdp; 986 struct mount *mp; 987 struct file *fp; 988 int error; 989 990 /* getvnode() will use the descriptor for us */ 991 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 992 return (error); 993 vp = (struct vnode *)fp->f_data; 994 995 VREF(vp); 996 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 997 if (vp->v_type != VDIR) 998 error = ENOTDIR; 999 else 1000 error = VOP_ACCESS(vp, VEXEC, l->l_cred, l); 1001 if (error) { 1002 vput(vp); 1003 goto out; 1004 } 1005 while ((mp = vp->v_mountedhere) != NULL) { 1006 if (vfs_busy(mp, 0, 0)) 1007 continue; 1008 1009 vput(vp); 1010 error = VFS_ROOT(mp, &tdp); 1011 vfs_unbusy(mp); 1012 if (error) 1013 goto out; 1014 vp = tdp; 1015 } 1016 VOP_UNLOCK(vp, 0); 1017 1018 /* 1019 * Disallow changing to a directory not under the process's 1020 * current root directory (if there is one). 1021 */ 1022 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 1023 vrele(vp); 1024 error = EPERM; /* operation not permitted */ 1025 goto out; 1026 } 1027 1028 vrele(cwdi->cwdi_cdir); 1029 cwdi->cwdi_cdir = vp; 1030 out: 1031 FILE_UNUSE(fp, l); 1032 return (error); 1033 } 1034 1035 /* 1036 * Change this process's notion of the root directory to a given file 1037 * descriptor. 1038 */ 1039 int 1040 sys_fchroot(struct lwp *l, void *v, register_t *retval) 1041 { 1042 struct sys_fchroot_args *uap = v; 1043 struct proc *p = l->l_proc; 1044 struct filedesc *fdp = p->p_fd; 1045 struct cwdinfo *cwdi = p->p_cwdi; 1046 struct vnode *vp; 1047 struct file *fp; 1048 int error; 1049 1050 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1051 KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) 1052 return error; 1053 /* getvnode() will use the descriptor for us */ 1054 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 1055 return error; 1056 vp = (struct vnode *) fp->f_data; 1057 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1058 if (vp->v_type != VDIR) 1059 error = ENOTDIR; 1060 else 1061 error = VOP_ACCESS(vp, VEXEC, l->l_cred, l); 1062 VOP_UNLOCK(vp, 0); 1063 if (error) 1064 goto out; 1065 VREF(vp); 1066 1067 /* 1068 * Prevent escaping from chroot by putting the root under 1069 * the working directory. Silently chdir to / if we aren't 1070 * already there. 1071 */ 1072 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1073 /* 1074 * XXX would be more failsafe to change directory to a 1075 * deadfs node here instead 1076 */ 1077 vrele(cwdi->cwdi_cdir); 1078 VREF(vp); 1079 cwdi->cwdi_cdir = vp; 1080 } 1081 1082 if (cwdi->cwdi_rdir != NULL) 1083 vrele(cwdi->cwdi_rdir); 1084 cwdi->cwdi_rdir = vp; 1085 out: 1086 FILE_UNUSE(fp, l); 1087 return (error); 1088 } 1089 1090 /* 1091 * Change current working directory (``.''). 1092 */ 1093 /* ARGSUSED */ 1094 int 1095 sys_chdir(struct lwp *l, void *v, register_t *retval) 1096 { 1097 struct sys_chdir_args /* { 1098 syscallarg(const char *) path; 1099 } */ *uap = v; 1100 struct proc *p = l->l_proc; 1101 struct cwdinfo *cwdi = p->p_cwdi; 1102 int error; 1103 struct nameidata nd; 1104 1105 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 1106 SCARG(uap, path), l); 1107 if ((error = change_dir(&nd, l)) != 0) 1108 return (error); 1109 vrele(cwdi->cwdi_cdir); 1110 cwdi->cwdi_cdir = nd.ni_vp; 1111 return (0); 1112 } 1113 1114 /* 1115 * Change notion of root (``/'') directory. 1116 */ 1117 /* ARGSUSED */ 1118 int 1119 sys_chroot(struct lwp *l, void *v, register_t *retval) 1120 { 1121 struct sys_chroot_args /* { 1122 syscallarg(const char *) path; 1123 } */ *uap = v; 1124 struct proc *p = l->l_proc; 1125 struct cwdinfo *cwdi = p->p_cwdi; 1126 struct vnode *vp; 1127 int error; 1128 struct nameidata nd; 1129 1130 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1131 KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) 1132 return (error); 1133 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 1134 SCARG(uap, path), l); 1135 if ((error = change_dir(&nd, l)) != 0) 1136 return (error); 1137 if (cwdi->cwdi_rdir != NULL) 1138 vrele(cwdi->cwdi_rdir); 1139 vp = nd.ni_vp; 1140 cwdi->cwdi_rdir = vp; 1141 1142 /* 1143 * Prevent escaping from chroot by putting the root under 1144 * the working directory. Silently chdir to / if we aren't 1145 * already there. 1146 */ 1147 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1148 /* 1149 * XXX would be more failsafe to change directory to a 1150 * deadfs node here instead 1151 */ 1152 vrele(cwdi->cwdi_cdir); 1153 VREF(vp); 1154 cwdi->cwdi_cdir = vp; 1155 } 1156 1157 return (0); 1158 } 1159 1160 /* 1161 * Common routine for chroot and chdir. 1162 */ 1163 static int 1164 change_dir(struct nameidata *ndp, struct lwp *l) 1165 { 1166 struct vnode *vp; 1167 int error; 1168 1169 if ((error = namei(ndp)) != 0) 1170 return (error); 1171 vp = ndp->ni_vp; 1172 if (vp->v_type != VDIR) 1173 error = ENOTDIR; 1174 else 1175 error = VOP_ACCESS(vp, VEXEC, l->l_cred, l); 1176 1177 if (error) 1178 vput(vp); 1179 else 1180 VOP_UNLOCK(vp, 0); 1181 return (error); 1182 } 1183 1184 /* 1185 * Check permissions, allocate an open file structure, 1186 * and call the device open routine if any. 1187 */ 1188 int 1189 sys_open(struct lwp *l, void *v, register_t *retval) 1190 { 1191 struct sys_open_args /* { 1192 syscallarg(const char *) path; 1193 syscallarg(int) flags; 1194 syscallarg(int) mode; 1195 } */ *uap = v; 1196 struct proc *p = l->l_proc; 1197 struct cwdinfo *cwdi = p->p_cwdi; 1198 struct filedesc *fdp = p->p_fd; 1199 struct file *fp; 1200 struct vnode *vp; 1201 int flags, cmode; 1202 int type, indx, error; 1203 struct flock lf; 1204 struct nameidata nd; 1205 1206 flags = FFLAGS(SCARG(uap, flags)); 1207 if ((flags & (FREAD | FWRITE)) == 0) 1208 return (EINVAL); 1209 /* falloc() will use the file descriptor for us */ 1210 if ((error = falloc(l, &fp, &indx)) != 0) 1211 return (error); 1212 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1213 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 1214 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1215 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1216 FILE_UNUSE(fp, l); 1217 fdp->fd_ofiles[indx] = NULL; 1218 ffree(fp); 1219 if ((error == EDUPFD || error == EMOVEFD) && 1220 l->l_dupfd >= 0 && /* XXX from fdopen */ 1221 (error = 1222 dupfdopen(l, indx, l->l_dupfd, flags, error)) == 0) { 1223 *retval = indx; 1224 return (0); 1225 } 1226 if (error == ERESTART) 1227 error = EINTR; 1228 fdremove(fdp, indx); 1229 return (error); 1230 } 1231 l->l_dupfd = 0; 1232 vp = nd.ni_vp; 1233 fp->f_flag = flags & FMASK; 1234 fp->f_type = DTYPE_VNODE; 1235 fp->f_ops = &vnops; 1236 fp->f_data = vp; 1237 if (flags & (O_EXLOCK | O_SHLOCK)) { 1238 lf.l_whence = SEEK_SET; 1239 lf.l_start = 0; 1240 lf.l_len = 0; 1241 if (flags & O_EXLOCK) 1242 lf.l_type = F_WRLCK; 1243 else 1244 lf.l_type = F_RDLCK; 1245 type = F_FLOCK; 1246 if ((flags & FNONBLOCK) == 0) 1247 type |= F_WAIT; 1248 VOP_UNLOCK(vp, 0); 1249 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1250 if (error) { 1251 (void) vn_close(vp, fp->f_flag, fp->f_cred, l); 1252 FILE_UNUSE(fp, l); 1253 ffree(fp); 1254 fdremove(fdp, indx); 1255 return (error); 1256 } 1257 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1258 fp->f_flag |= FHASLOCK; 1259 } 1260 VOP_UNLOCK(vp, 0); 1261 *retval = indx; 1262 FILE_SET_MATURE(fp); 1263 FILE_UNUSE(fp, l); 1264 return (0); 1265 } 1266 1267 static void 1268 vfs__fhfree(fhandle_t *fhp) 1269 { 1270 size_t fhsize; 1271 1272 if (fhp == NULL) { 1273 return; 1274 } 1275 fhsize = FHANDLE_SIZE(fhp); 1276 kmem_free(fhp, fhsize); 1277 } 1278 1279 /* 1280 * vfs_composefh: compose a filehandle. 1281 */ 1282 1283 int 1284 vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) 1285 { 1286 struct mount *mp; 1287 struct fid *fidp; 1288 int error; 1289 size_t needfhsize; 1290 size_t fidsize; 1291 1292 mp = vp->v_mount; 1293 fidp = NULL; 1294 if (*fh_size < FHANDLE_SIZE_MIN) { 1295 fidsize = 0; 1296 } else { 1297 fidsize = *fh_size - offsetof(fhandle_t, fh_fid); 1298 if (fhp != NULL) { 1299 memset(fhp, 0, *fh_size); 1300 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1301 fidp = &fhp->fh_fid; 1302 } 1303 } 1304 error = VFS_VPTOFH(vp, fidp, &fidsize); 1305 needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1306 if (error == 0 && *fh_size < needfhsize) { 1307 error = E2BIG; 1308 } 1309 *fh_size = needfhsize; 1310 return error; 1311 } 1312 1313 int 1314 vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) 1315 { 1316 struct mount *mp; 1317 fhandle_t *fhp; 1318 size_t fhsize; 1319 size_t fidsize; 1320 int error; 1321 1322 *fhpp = NULL; 1323 mp = vp->v_mount; 1324 fidsize = 0; 1325 error = VFS_VPTOFH(vp, NULL, &fidsize); 1326 KASSERT(error != 0); 1327 if (error != E2BIG) { 1328 goto out; 1329 } 1330 fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1331 fhp = kmem_zalloc(fhsize, KM_SLEEP); 1332 if (fhp == NULL) { 1333 error = ENOMEM; 1334 goto out; 1335 } 1336 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1337 error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); 1338 if (error == 0) { 1339 KASSERT((FHANDLE_SIZE(fhp) == fhsize && 1340 FHANDLE_FILEID(fhp)->fid_len == fidsize)); 1341 *fhpp = fhp; 1342 } else { 1343 kmem_free(fhp, fhsize); 1344 } 1345 out: 1346 return error; 1347 } 1348 1349 void 1350 vfs_composefh_free(fhandle_t *fhp) 1351 { 1352 1353 vfs__fhfree(fhp); 1354 } 1355 1356 /* 1357 * vfs_fhtovp: lookup a vnode by a filehandle. 1358 */ 1359 1360 int 1361 vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) 1362 { 1363 struct mount *mp; 1364 int error; 1365 1366 *vpp = NULL; 1367 mp = vfs_getvfs(FHANDLE_FSID(fhp)); 1368 if (mp == NULL) { 1369 error = ESTALE; 1370 goto out; 1371 } 1372 if (mp->mnt_op->vfs_fhtovp == NULL) { 1373 error = EOPNOTSUPP; 1374 goto out; 1375 } 1376 error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp); 1377 out: 1378 return error; 1379 } 1380 1381 /* 1382 * vfs_copyinfh_alloc: allocate and copyin a filehandle, given 1383 * the needed size. 1384 */ 1385 1386 int 1387 vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) 1388 { 1389 fhandle_t *fhp; 1390 int error; 1391 1392 *fhpp = NULL; 1393 if (fhsize > FHANDLE_SIZE_MAX) { 1394 return EINVAL; 1395 } 1396 if (fhsize < FHANDLE_SIZE_MIN) { 1397 return EINVAL; 1398 } 1399 again: 1400 fhp = kmem_alloc(fhsize, KM_SLEEP); 1401 if (fhp == NULL) { 1402 return ENOMEM; 1403 } 1404 error = copyin(ufhp, fhp, fhsize); 1405 if (error == 0) { 1406 /* XXX this check shouldn't be here */ 1407 if (FHANDLE_SIZE(fhp) == fhsize) { 1408 *fhpp = fhp; 1409 return 0; 1410 } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { 1411 /* 1412 * a kludge for nfsv2 padded handles. 1413 */ 1414 size_t sz; 1415 1416 sz = FHANDLE_SIZE(fhp); 1417 kmem_free(fhp, fhsize); 1418 fhsize = sz; 1419 goto again; 1420 } else { 1421 /* 1422 * userland told us wrong size. 1423 */ 1424 error = EINVAL; 1425 } 1426 } 1427 kmem_free(fhp, fhsize); 1428 return error; 1429 } 1430 1431 void 1432 vfs_copyinfh_free(fhandle_t *fhp) 1433 { 1434 1435 vfs__fhfree(fhp); 1436 } 1437 1438 /* 1439 * Get file handle system call 1440 */ 1441 int 1442 sys___getfh30(struct lwp *l, void *v, register_t *retval) 1443 { 1444 struct sys___getfh30_args /* { 1445 syscallarg(char *) fname; 1446 syscallarg(fhandle_t *) fhp; 1447 syscallarg(size_t *) fh_size; 1448 } */ *uap = v; 1449 struct vnode *vp; 1450 fhandle_t *fh; 1451 int error; 1452 struct nameidata nd; 1453 size_t sz; 1454 size_t usz; 1455 1456 /* 1457 * Must be super user 1458 */ 1459 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1460 0, NULL, NULL, NULL); 1461 if (error) 1462 return (error); 1463 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 1464 SCARG(uap, fname), l); 1465 error = namei(&nd); 1466 if (error) 1467 return (error); 1468 vp = nd.ni_vp; 1469 error = vfs_composefh_alloc(vp, &fh); 1470 vput(vp); 1471 if (error != 0) { 1472 goto out; 1473 } 1474 error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); 1475 if (error != 0) { 1476 goto out; 1477 } 1478 sz = FHANDLE_SIZE(fh); 1479 error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); 1480 if (error != 0) { 1481 goto out; 1482 } 1483 if (usz >= sz) { 1484 error = copyout(fh, SCARG(uap, fhp), sz); 1485 } else { 1486 error = E2BIG; 1487 } 1488 out: 1489 vfs_composefh_free(fh); 1490 return (error); 1491 } 1492 1493 /* 1494 * Open a file given a file handle. 1495 * 1496 * Check permissions, allocate an open file structure, 1497 * and call the device open routine if any. 1498 */ 1499 1500 int 1501 dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, 1502 register_t *retval) 1503 { 1504 struct filedesc *fdp = l->l_proc->p_fd; 1505 struct file *fp; 1506 struct vnode *vp = NULL; 1507 kauth_cred_t cred = l->l_cred; 1508 struct file *nfp; 1509 int type, indx, error=0; 1510 struct flock lf; 1511 struct vattr va; 1512 fhandle_t *fh; 1513 int flags; 1514 1515 /* 1516 * Must be super user 1517 */ 1518 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1519 0, NULL, NULL, NULL))) 1520 return (error); 1521 1522 flags = FFLAGS(oflags); 1523 if ((flags & (FREAD | FWRITE)) == 0) 1524 return (EINVAL); 1525 if ((flags & O_CREAT)) 1526 return (EINVAL); 1527 /* falloc() will use the file descriptor for us */ 1528 if ((error = falloc(l, &nfp, &indx)) != 0) 1529 return (error); 1530 fp = nfp; 1531 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1532 if (error != 0) { 1533 goto bad; 1534 } 1535 error = vfs_fhtovp(fh, &vp); 1536 if (error != 0) { 1537 goto bad; 1538 } 1539 1540 /* Now do an effective vn_open */ 1541 1542 if (vp->v_type == VSOCK) { 1543 error = EOPNOTSUPP; 1544 goto bad; 1545 } 1546 if (flags & FREAD) { 1547 if ((error = VOP_ACCESS(vp, VREAD, cred, l)) != 0) 1548 goto bad; 1549 } 1550 if (flags & (FWRITE | O_TRUNC)) { 1551 if (vp->v_type == VDIR) { 1552 error = EISDIR; 1553 goto bad; 1554 } 1555 if ((error = vn_writechk(vp)) != 0 || 1556 (error = VOP_ACCESS(vp, VWRITE, cred, l)) != 0) 1557 goto bad; 1558 } 1559 if (flags & O_TRUNC) { 1560 VOP_UNLOCK(vp, 0); /* XXX */ 1561 VOP_LEASE(vp, l, cred, LEASE_WRITE); 1562 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1563 VATTR_NULL(&va); 1564 va.va_size = 0; 1565 error = VOP_SETATTR(vp, &va, cred, l); 1566 if (error) 1567 goto bad; 1568 } 1569 if ((error = VOP_OPEN(vp, flags, cred, l)) != 0) 1570 goto bad; 1571 if (vp->v_type == VREG && 1572 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1573 error = EIO; 1574 goto bad; 1575 } 1576 if (flags & FWRITE) 1577 vp->v_writecount++; 1578 1579 /* done with modified vn_open, now finish what sys_open does. */ 1580 1581 fp->f_flag = flags & FMASK; 1582 fp->f_type = DTYPE_VNODE; 1583 fp->f_ops = &vnops; 1584 fp->f_data = vp; 1585 if (flags & (O_EXLOCK | O_SHLOCK)) { 1586 lf.l_whence = SEEK_SET; 1587 lf.l_start = 0; 1588 lf.l_len = 0; 1589 if (flags & O_EXLOCK) 1590 lf.l_type = F_WRLCK; 1591 else 1592 lf.l_type = F_RDLCK; 1593 type = F_FLOCK; 1594 if ((flags & FNONBLOCK) == 0) 1595 type |= F_WAIT; 1596 VOP_UNLOCK(vp, 0); 1597 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1598 if (error) { 1599 (void) vn_close(vp, fp->f_flag, fp->f_cred, l); 1600 FILE_UNUSE(fp, l); 1601 ffree(fp); 1602 fdremove(fdp, indx); 1603 return (error); 1604 } 1605 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1606 fp->f_flag |= FHASLOCK; 1607 } 1608 VOP_UNLOCK(vp, 0); 1609 *retval = indx; 1610 FILE_SET_MATURE(fp); 1611 FILE_UNUSE(fp, l); 1612 vfs_copyinfh_free(fh); 1613 return (0); 1614 1615 bad: 1616 FILE_UNUSE(fp, l); 1617 ffree(fp); 1618 fdremove(fdp, indx); 1619 if (vp != NULL) 1620 vput(vp); 1621 vfs_copyinfh_free(fh); 1622 return (error); 1623 } 1624 1625 int 1626 sys___fhopen40(struct lwp *l, void *v, register_t *retval) 1627 { 1628 struct sys___fhopen40_args /* { 1629 syscallarg(const void *) fhp; 1630 syscallarg(size_t) fh_size; 1631 syscallarg(int) flags; 1632 } */ *uap = v; 1633 1634 return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), 1635 SCARG(uap, flags), retval); 1636 } 1637 1638 int 1639 do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb) 1640 { 1641 int error; 1642 fhandle_t *fh; 1643 struct vnode *vp; 1644 1645 /* 1646 * Must be super user 1647 */ 1648 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1649 0, NULL, NULL, NULL))) 1650 return (error); 1651 1652 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1653 if (error != 0) 1654 return error; 1655 1656 error = vfs_fhtovp(fh, &vp); 1657 vfs_copyinfh_free(fh); 1658 if (error != 0) 1659 return error; 1660 1661 error = vn_stat(vp, sb, l); 1662 vput(vp); 1663 return error; 1664 } 1665 1666 1667 /* ARGSUSED */ 1668 int 1669 sys___fhstat40(struct lwp *l, void *v, register_t *retval) 1670 { 1671 struct sys___fhstat40_args /* { 1672 syscallarg(const void *) fhp; 1673 syscallarg(size_t) fh_size; 1674 syscallarg(struct stat *) sb; 1675 } */ *uap = v; 1676 struct stat sb; 1677 int error; 1678 1679 error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb); 1680 if (error) 1681 return error; 1682 return copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1683 } 1684 1685 int 1686 do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb, 1687 int flags) 1688 { 1689 fhandle_t *fh; 1690 struct mount *mp; 1691 struct vnode *vp; 1692 int error; 1693 1694 /* 1695 * Must be super user 1696 */ 1697 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1698 0, NULL, NULL, NULL))) 1699 return error; 1700 1701 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1702 if (error != 0) 1703 return error; 1704 1705 error = vfs_fhtovp(fh, &vp); 1706 vfs_copyinfh_free(fh); 1707 if (error != 0) 1708 return error; 1709 1710 mp = vp->v_mount; 1711 error = dostatvfs(mp, sb, l, flags, 1); 1712 vput(vp); 1713 return error; 1714 } 1715 1716 /* ARGSUSED */ 1717 int 1718 sys___fhstatvfs140(struct lwp *l, void *v, register_t *retval) 1719 { 1720 struct sys___fhstatvfs140_args /* { 1721 syscallarg(const void *) fhp; 1722 syscallarg(size_t) fh_size; 1723 syscallarg(struct statvfs *) buf; 1724 syscallarg(int) flags; 1725 } */ *uap = v; 1726 struct statvfs *sb = STATVFSBUF_GET(); 1727 int error; 1728 1729 error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb, 1730 SCARG(uap, flags)); 1731 if (error == 0) 1732 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1733 STATVFSBUF_PUT(sb); 1734 return error; 1735 } 1736 1737 /* 1738 * Create a special file. 1739 */ 1740 /* ARGSUSED */ 1741 int 1742 sys_mknod(struct lwp *l, void *v, register_t *retval) 1743 { 1744 struct sys_mknod_args /* { 1745 syscallarg(const char *) path; 1746 syscallarg(int) mode; 1747 syscallarg(int) dev; 1748 } */ *uap = v; 1749 struct proc *p = l->l_proc; 1750 struct vnode *vp; 1751 struct vattr vattr; 1752 int error, optype; 1753 struct nameidata nd; 1754 char *path; 1755 const char *cpath; 1756 enum uio_seg seg = UIO_USERSPACE; 1757 1758 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 1759 0, NULL, NULL, NULL)) != 0) 1760 return (error); 1761 1762 optype = VOP_MKNOD_DESCOFFSET; 1763 1764 VERIEXEC_PATH_GET(SCARG(uap, path), seg, cpath, path); 1765 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, seg, cpath, l); 1766 1767 if ((error = namei(&nd)) != 0) 1768 goto out; 1769 vp = nd.ni_vp; 1770 if (vp != NULL) 1771 error = EEXIST; 1772 else { 1773 VATTR_NULL(&vattr); 1774 vattr.va_mode = 1775 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1776 vattr.va_rdev = SCARG(uap, dev); 1777 1778 switch (SCARG(uap, mode) & S_IFMT) { 1779 case S_IFMT: /* used by badsect to flag bad sectors */ 1780 vattr.va_type = VBAD; 1781 break; 1782 case S_IFCHR: 1783 vattr.va_type = VCHR; 1784 break; 1785 case S_IFBLK: 1786 vattr.va_type = VBLK; 1787 break; 1788 case S_IFWHT: 1789 optype = VOP_WHITEOUT_DESCOFFSET; 1790 break; 1791 case S_IFREG: 1792 #if NVERIEXEC > 0 1793 error = veriexec_openchk(l, nd.ni_vp, nd.ni_dirp, 1794 O_CREAT); 1795 #endif /* NVERIEXEC > 0 */ 1796 vattr.va_type = VREG; 1797 vattr.va_rdev = VNOVAL; 1798 optype = VOP_CREATE_DESCOFFSET; 1799 break; 1800 default: 1801 error = EINVAL; 1802 break; 1803 } 1804 } 1805 if (!error) { 1806 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1807 switch (optype) { 1808 case VOP_WHITEOUT_DESCOFFSET: 1809 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1810 if (error) 1811 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1812 vput(nd.ni_dvp); 1813 break; 1814 1815 case VOP_MKNOD_DESCOFFSET: 1816 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1817 &nd.ni_cnd, &vattr); 1818 if (error == 0) 1819 vput(nd.ni_vp); 1820 break; 1821 1822 case VOP_CREATE_DESCOFFSET: 1823 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, 1824 &nd.ni_cnd, &vattr); 1825 if (error == 0) 1826 vput(nd.ni_vp); 1827 break; 1828 } 1829 } else { 1830 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1831 if (nd.ni_dvp == vp) 1832 vrele(nd.ni_dvp); 1833 else 1834 vput(nd.ni_dvp); 1835 if (vp) 1836 vrele(vp); 1837 } 1838 out: 1839 VERIEXEC_PATH_PUT(path); 1840 return (error); 1841 } 1842 1843 /* 1844 * Create a named pipe. 1845 */ 1846 /* ARGSUSED */ 1847 int 1848 sys_mkfifo(struct lwp *l, void *v, register_t *retval) 1849 { 1850 struct sys_mkfifo_args /* { 1851 syscallarg(const char *) path; 1852 syscallarg(int) mode; 1853 } */ *uap = v; 1854 struct proc *p = l->l_proc; 1855 struct vattr vattr; 1856 int error; 1857 struct nameidata nd; 1858 1859 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 1860 if ((error = namei(&nd)) != 0) 1861 return (error); 1862 if (nd.ni_vp != NULL) { 1863 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1864 if (nd.ni_dvp == nd.ni_vp) 1865 vrele(nd.ni_dvp); 1866 else 1867 vput(nd.ni_dvp); 1868 vrele(nd.ni_vp); 1869 return (EEXIST); 1870 } 1871 VATTR_NULL(&vattr); 1872 vattr.va_type = VFIFO; 1873 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1874 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1875 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1876 if (error == 0) 1877 vput(nd.ni_vp); 1878 return (error); 1879 } 1880 1881 /* 1882 * Make a hard file link. 1883 */ 1884 /* ARGSUSED */ 1885 int 1886 sys_link(struct lwp *l, void *v, register_t *retval) 1887 { 1888 struct sys_link_args /* { 1889 syscallarg(const char *) path; 1890 syscallarg(const char *) link; 1891 } */ *uap = v; 1892 struct vnode *vp; 1893 struct nameidata nd; 1894 int error; 1895 1896 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 1897 if ((error = namei(&nd)) != 0) 1898 return (error); 1899 vp = nd.ni_vp; 1900 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, link), l); 1901 if ((error = namei(&nd)) != 0) 1902 goto out; 1903 if (nd.ni_vp) { 1904 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1905 if (nd.ni_dvp == nd.ni_vp) 1906 vrele(nd.ni_dvp); 1907 else 1908 vput(nd.ni_dvp); 1909 vrele(nd.ni_vp); 1910 error = EEXIST; 1911 goto out; 1912 } 1913 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1914 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 1915 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1916 out: 1917 vrele(vp); 1918 return (error); 1919 } 1920 1921 /* 1922 * Make a symbolic link. 1923 */ 1924 /* ARGSUSED */ 1925 int 1926 sys_symlink(struct lwp *l, void *v, register_t *retval) 1927 { 1928 struct sys_symlink_args /* { 1929 syscallarg(const char *) path; 1930 syscallarg(const char *) link; 1931 } */ *uap = v; 1932 struct proc *p = l->l_proc; 1933 struct vattr vattr; 1934 char *path; 1935 int error; 1936 struct nameidata nd; 1937 1938 path = PNBUF_GET(); 1939 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1940 if (error) 1941 goto out; 1942 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, link), l); 1943 if ((error = namei(&nd)) != 0) 1944 goto out; 1945 if (nd.ni_vp) { 1946 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1947 if (nd.ni_dvp == nd.ni_vp) 1948 vrele(nd.ni_dvp); 1949 else 1950 vput(nd.ni_dvp); 1951 vrele(nd.ni_vp); 1952 error = EEXIST; 1953 goto out; 1954 } 1955 VATTR_NULL(&vattr); 1956 vattr.va_type = VLNK; 1957 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1958 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1959 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1960 if (error == 0) 1961 vput(nd.ni_vp); 1962 out: 1963 PNBUF_PUT(path); 1964 return (error); 1965 } 1966 1967 /* 1968 * Delete a whiteout from the filesystem. 1969 */ 1970 /* ARGSUSED */ 1971 int 1972 sys_undelete(struct lwp *l, void *v, register_t *retval) 1973 { 1974 struct sys_undelete_args /* { 1975 syscallarg(const char *) path; 1976 } */ *uap = v; 1977 int error; 1978 struct nameidata nd; 1979 1980 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT, UIO_USERSPACE, 1981 SCARG(uap, path), l); 1982 error = namei(&nd); 1983 if (error) 1984 return (error); 1985 1986 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1987 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1988 if (nd.ni_dvp == nd.ni_vp) 1989 vrele(nd.ni_dvp); 1990 else 1991 vput(nd.ni_dvp); 1992 if (nd.ni_vp) 1993 vrele(nd.ni_vp); 1994 return (EEXIST); 1995 } 1996 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1997 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1998 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1999 vput(nd.ni_dvp); 2000 return (error); 2001 } 2002 2003 /* 2004 * Delete a name from the filesystem. 2005 */ 2006 /* ARGSUSED */ 2007 int 2008 sys_unlink(struct lwp *l, void *v, register_t *retval) 2009 { 2010 struct sys_unlink_args /* { 2011 syscallarg(const char *) path; 2012 } */ *uap = v; 2013 struct vnode *vp; 2014 int error; 2015 struct nameidata nd; 2016 char *path; 2017 const char *cpath; 2018 enum uio_seg seg = UIO_USERSPACE; 2019 2020 VERIEXEC_PATH_GET(SCARG(uap, path), seg, cpath, path); 2021 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, seg, cpath, l); 2022 2023 if ((error = namei(&nd)) != 0) 2024 goto out; 2025 vp = nd.ni_vp; 2026 2027 /* 2028 * The root of a mounted filesystem cannot be deleted. 2029 */ 2030 if (vp->v_flag & VROOT) { 2031 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2032 if (nd.ni_dvp == vp) 2033 vrele(nd.ni_dvp); 2034 else 2035 vput(nd.ni_dvp); 2036 vput(vp); 2037 error = EBUSY; 2038 goto out; 2039 } 2040 2041 #if NVERIEXEC > 0 2042 /* Handle remove requests for veriexec entries. */ 2043 if ((error = veriexec_removechk(l, nd.ni_vp, nd.ni_dirp)) != 0) { 2044 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2045 if (nd.ni_dvp == vp) 2046 vrele(nd.ni_dvp); 2047 else 2048 vput(nd.ni_dvp); 2049 vput(vp); 2050 goto out; 2051 } 2052 #endif /* NVERIEXEC > 0 */ 2053 2054 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 2055 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2056 #ifdef FILEASSOC 2057 (void)fileassoc_file_delete(vp); 2058 #endif /* FILEASSOC */ 2059 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2060 out: 2061 VERIEXEC_PATH_PUT(path); 2062 return (error); 2063 } 2064 2065 /* 2066 * Reposition read/write file offset. 2067 */ 2068 int 2069 sys_lseek(struct lwp *l, void *v, register_t *retval) 2070 { 2071 struct sys_lseek_args /* { 2072 syscallarg(int) fd; 2073 syscallarg(int) pad; 2074 syscallarg(off_t) offset; 2075 syscallarg(int) whence; 2076 } */ *uap = v; 2077 struct proc *p = l->l_proc; 2078 kauth_cred_t cred = l->l_cred; 2079 struct filedesc *fdp = p->p_fd; 2080 struct file *fp; 2081 struct vnode *vp; 2082 struct vattr vattr; 2083 off_t newoff; 2084 int error; 2085 2086 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 2087 return (EBADF); 2088 2089 FILE_USE(fp); 2090 2091 vp = (struct vnode *)fp->f_data; 2092 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2093 error = ESPIPE; 2094 goto out; 2095 } 2096 2097 switch (SCARG(uap, whence)) { 2098 case SEEK_CUR: 2099 newoff = fp->f_offset + SCARG(uap, offset); 2100 break; 2101 case SEEK_END: 2102 error = VOP_GETATTR(vp, &vattr, cred, l); 2103 if (error) 2104 goto out; 2105 newoff = SCARG(uap, offset) + vattr.va_size; 2106 break; 2107 case SEEK_SET: 2108 newoff = SCARG(uap, offset); 2109 break; 2110 default: 2111 error = EINVAL; 2112 goto out; 2113 } 2114 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 2115 goto out; 2116 2117 *(off_t *)retval = fp->f_offset = newoff; 2118 out: 2119 FILE_UNUSE(fp, l); 2120 return (error); 2121 } 2122 2123 /* 2124 * Positional read system call. 2125 */ 2126 int 2127 sys_pread(struct lwp *l, void *v, register_t *retval) 2128 { 2129 struct sys_pread_args /* { 2130 syscallarg(int) fd; 2131 syscallarg(void *) buf; 2132 syscallarg(size_t) nbyte; 2133 syscallarg(off_t) offset; 2134 } */ *uap = v; 2135 struct proc *p = l->l_proc; 2136 struct filedesc *fdp = p->p_fd; 2137 struct file *fp; 2138 struct vnode *vp; 2139 off_t offset; 2140 int error, fd = SCARG(uap, fd); 2141 2142 if ((fp = fd_getfile(fdp, fd)) == NULL) 2143 return (EBADF); 2144 2145 if ((fp->f_flag & FREAD) == 0) { 2146 simple_unlock(&fp->f_slock); 2147 return (EBADF); 2148 } 2149 2150 FILE_USE(fp); 2151 2152 vp = (struct vnode *)fp->f_data; 2153 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2154 error = ESPIPE; 2155 goto out; 2156 } 2157 2158 offset = SCARG(uap, offset); 2159 2160 /* 2161 * XXX This works because no file systems actually 2162 * XXX take any action on the seek operation. 2163 */ 2164 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2165 goto out; 2166 2167 /* dofileread() will unuse the descriptor for us */ 2168 return (dofileread(l, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2169 &offset, 0, retval)); 2170 2171 out: 2172 FILE_UNUSE(fp, l); 2173 return (error); 2174 } 2175 2176 /* 2177 * Positional scatter read system call. 2178 */ 2179 int 2180 sys_preadv(struct lwp *l, void *v, register_t *retval) 2181 { 2182 struct sys_preadv_args /* { 2183 syscallarg(int) fd; 2184 syscallarg(const struct iovec *) iovp; 2185 syscallarg(int) iovcnt; 2186 syscallarg(off_t) offset; 2187 } */ *uap = v; 2188 2189 return do_filereadv(l, SCARG(uap, fd), SCARG(uap, iovp), 2190 SCARG(uap, iovcnt), &SCARG(uap, offset), 0, retval); 2191 } 2192 2193 /* 2194 * Positional write system call. 2195 */ 2196 int 2197 sys_pwrite(struct lwp *l, void *v, register_t *retval) 2198 { 2199 struct sys_pwrite_args /* { 2200 syscallarg(int) fd; 2201 syscallarg(const void *) buf; 2202 syscallarg(size_t) nbyte; 2203 syscallarg(off_t) offset; 2204 } */ *uap = v; 2205 struct proc *p = l->l_proc; 2206 struct filedesc *fdp = p->p_fd; 2207 struct file *fp; 2208 struct vnode *vp; 2209 off_t offset; 2210 int error, fd = SCARG(uap, fd); 2211 2212 if ((fp = fd_getfile(fdp, fd)) == NULL) 2213 return (EBADF); 2214 2215 if ((fp->f_flag & FWRITE) == 0) { 2216 simple_unlock(&fp->f_slock); 2217 return (EBADF); 2218 } 2219 2220 FILE_USE(fp); 2221 2222 vp = (struct vnode *)fp->f_data; 2223 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2224 error = ESPIPE; 2225 goto out; 2226 } 2227 2228 offset = SCARG(uap, offset); 2229 2230 /* 2231 * XXX This works because no file systems actually 2232 * XXX take any action on the seek operation. 2233 */ 2234 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2235 goto out; 2236 2237 /* dofilewrite() will unuse the descriptor for us */ 2238 return (dofilewrite(l, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2239 &offset, 0, retval)); 2240 2241 out: 2242 FILE_UNUSE(fp, l); 2243 return (error); 2244 } 2245 2246 /* 2247 * Positional gather write system call. 2248 */ 2249 int 2250 sys_pwritev(struct lwp *l, void *v, register_t *retval) 2251 { 2252 struct sys_pwritev_args /* { 2253 syscallarg(int) fd; 2254 syscallarg(const struct iovec *) iovp; 2255 syscallarg(int) iovcnt; 2256 syscallarg(off_t) offset; 2257 } */ *uap = v; 2258 2259 return do_filewritev(l, SCARG(uap, fd), SCARG(uap, iovp), 2260 SCARG(uap, iovcnt), &SCARG(uap, offset), 0, retval); 2261 } 2262 2263 /* 2264 * Check access permissions. 2265 */ 2266 int 2267 sys_access(struct lwp *l, void *v, register_t *retval) 2268 { 2269 struct sys_access_args /* { 2270 syscallarg(const char *) path; 2271 syscallarg(int) flags; 2272 } */ *uap = v; 2273 kauth_cred_t cred; 2274 struct vnode *vp; 2275 int error, flags; 2276 struct nameidata nd; 2277 2278 cred = kauth_cred_dup(l->l_cred); 2279 kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); 2280 kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); 2281 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 2282 SCARG(uap, path), l); 2283 /* Override default credentials */ 2284 nd.ni_cnd.cn_cred = cred; 2285 if ((error = namei(&nd)) != 0) 2286 goto out; 2287 vp = nd.ni_vp; 2288 2289 /* Flags == 0 means only check for existence. */ 2290 if (SCARG(uap, flags)) { 2291 flags = 0; 2292 if (SCARG(uap, flags) & R_OK) 2293 flags |= VREAD; 2294 if (SCARG(uap, flags) & W_OK) 2295 flags |= VWRITE; 2296 if (SCARG(uap, flags) & X_OK) 2297 flags |= VEXEC; 2298 2299 error = VOP_ACCESS(vp, flags, cred, l); 2300 if (!error && (flags & VWRITE)) 2301 error = vn_writechk(vp); 2302 } 2303 vput(vp); 2304 out: 2305 kauth_cred_free(cred); 2306 return (error); 2307 } 2308 2309 /* 2310 * Common code for all sys_stat functions, including compat versions. 2311 */ 2312 int 2313 do_sys_stat(struct lwp *l, const char *path, unsigned int nd_flags, 2314 struct stat *sb) 2315 { 2316 int error; 2317 struct nameidata nd; 2318 2319 NDINIT(&nd, LOOKUP, nd_flags | LOCKLEAF | TRYEMULROOT , UIO_USERSPACE, path, l); 2320 error = namei(&nd); 2321 if (error != 0) 2322 return error; 2323 error = vn_stat(nd.ni_vp, sb, l); 2324 vput(nd.ni_vp); 2325 return error; 2326 } 2327 2328 /* 2329 * Get file status; this version follows links. 2330 */ 2331 /* ARGSUSED */ 2332 int 2333 sys___stat30(struct lwp *l, void *v, register_t *retval) 2334 { 2335 struct sys___stat30_args /* { 2336 syscallarg(const char *) path; 2337 syscallarg(struct stat *) ub; 2338 } */ *uap = v; 2339 struct stat sb; 2340 int error; 2341 2342 error = do_sys_stat(l, SCARG(uap, path), FOLLOW, &sb); 2343 if (error) 2344 return error; 2345 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2346 } 2347 2348 /* 2349 * Get file status; this version does not follow links. 2350 */ 2351 /* ARGSUSED */ 2352 int 2353 sys___lstat30(struct lwp *l, void *v, register_t *retval) 2354 { 2355 struct sys___lstat30_args /* { 2356 syscallarg(const char *) path; 2357 syscallarg(struct stat *) ub; 2358 } */ *uap = v; 2359 struct stat sb; 2360 int error; 2361 2362 error = do_sys_stat(l, SCARG(uap, path), NOFOLLOW, &sb); 2363 if (error) 2364 return error; 2365 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2366 } 2367 2368 /* 2369 * Get configurable pathname variables. 2370 */ 2371 /* ARGSUSED */ 2372 int 2373 sys_pathconf(struct lwp *l, void *v, register_t *retval) 2374 { 2375 struct sys_pathconf_args /* { 2376 syscallarg(const char *) path; 2377 syscallarg(int) name; 2378 } */ *uap = v; 2379 int error; 2380 struct nameidata nd; 2381 2382 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 2383 SCARG(uap, path), l); 2384 if ((error = namei(&nd)) != 0) 2385 return (error); 2386 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2387 vput(nd.ni_vp); 2388 return (error); 2389 } 2390 2391 /* 2392 * Return target name of a symbolic link. 2393 */ 2394 /* ARGSUSED */ 2395 int 2396 sys_readlink(struct lwp *l, void *v, register_t *retval) 2397 { 2398 struct sys_readlink_args /* { 2399 syscallarg(const char *) path; 2400 syscallarg(char *) buf; 2401 syscallarg(size_t) count; 2402 } */ *uap = v; 2403 struct vnode *vp; 2404 struct iovec aiov; 2405 struct uio auio; 2406 int error; 2407 struct nameidata nd; 2408 2409 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 2410 SCARG(uap, path), l); 2411 if ((error = namei(&nd)) != 0) 2412 return (error); 2413 vp = nd.ni_vp; 2414 if (vp->v_type != VLNK) 2415 error = EINVAL; 2416 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2417 (error = VOP_ACCESS(vp, VREAD, l->l_cred, l)) == 0) { 2418 aiov.iov_base = SCARG(uap, buf); 2419 aiov.iov_len = SCARG(uap, count); 2420 auio.uio_iov = &aiov; 2421 auio.uio_iovcnt = 1; 2422 auio.uio_offset = 0; 2423 auio.uio_rw = UIO_READ; 2424 KASSERT(l == curlwp); 2425 auio.uio_vmspace = l->l_proc->p_vmspace; 2426 auio.uio_resid = SCARG(uap, count); 2427 error = VOP_READLINK(vp, &auio, l->l_cred); 2428 } 2429 vput(vp); 2430 *retval = SCARG(uap, count) - auio.uio_resid; 2431 return (error); 2432 } 2433 2434 /* 2435 * Change flags of a file given a path name. 2436 */ 2437 /* ARGSUSED */ 2438 int 2439 sys_chflags(struct lwp *l, void *v, register_t *retval) 2440 { 2441 struct sys_chflags_args /* { 2442 syscallarg(const char *) path; 2443 syscallarg(u_long) flags; 2444 } */ *uap = v; 2445 struct vnode *vp; 2446 int error; 2447 struct nameidata nd; 2448 2449 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2450 if ((error = namei(&nd)) != 0) 2451 return (error); 2452 vp = nd.ni_vp; 2453 error = change_flags(vp, SCARG(uap, flags), l); 2454 vput(vp); 2455 return (error); 2456 } 2457 2458 /* 2459 * Change flags of a file given a file descriptor. 2460 */ 2461 /* ARGSUSED */ 2462 int 2463 sys_fchflags(struct lwp *l, void *v, register_t *retval) 2464 { 2465 struct sys_fchflags_args /* { 2466 syscallarg(int) fd; 2467 syscallarg(u_long) flags; 2468 } */ *uap = v; 2469 struct proc *p = l->l_proc; 2470 struct vnode *vp; 2471 struct file *fp; 2472 int error; 2473 2474 /* getvnode() will use the descriptor for us */ 2475 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2476 return (error); 2477 vp = (struct vnode *)fp->f_data; 2478 error = change_flags(vp, SCARG(uap, flags), l); 2479 VOP_UNLOCK(vp, 0); 2480 FILE_UNUSE(fp, l); 2481 return (error); 2482 } 2483 2484 /* 2485 * Change flags of a file given a path name; this version does 2486 * not follow links. 2487 */ 2488 int 2489 sys_lchflags(struct lwp *l, void *v, register_t *retval) 2490 { 2491 struct sys_lchflags_args /* { 2492 syscallarg(const char *) path; 2493 syscallarg(u_long) flags; 2494 } */ *uap = v; 2495 struct vnode *vp; 2496 int error; 2497 struct nameidata nd; 2498 2499 NDINIT(&nd, LOOKUP, NOFOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2500 if ((error = namei(&nd)) != 0) 2501 return (error); 2502 vp = nd.ni_vp; 2503 error = change_flags(vp, SCARG(uap, flags), l); 2504 vput(vp); 2505 return (error); 2506 } 2507 2508 /* 2509 * Common routine to change flags of a file. 2510 */ 2511 int 2512 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 2513 { 2514 struct vattr vattr; 2515 int error; 2516 2517 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2518 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2519 /* 2520 * Non-superusers cannot change the flags on devices, even if they 2521 * own them. 2522 */ 2523 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) { 2524 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred, l)) != 0) 2525 goto out; 2526 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2527 error = EINVAL; 2528 goto out; 2529 } 2530 } 2531 VATTR_NULL(&vattr); 2532 vattr.va_flags = flags; 2533 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 2534 out: 2535 return (error); 2536 } 2537 2538 /* 2539 * Change mode of a file given path name; this version follows links. 2540 */ 2541 /* ARGSUSED */ 2542 int 2543 sys_chmod(struct lwp *l, void *v, register_t *retval) 2544 { 2545 struct sys_chmod_args /* { 2546 syscallarg(const char *) path; 2547 syscallarg(int) mode; 2548 } */ *uap = v; 2549 int error; 2550 struct nameidata nd; 2551 2552 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2553 if ((error = namei(&nd)) != 0) 2554 return (error); 2555 2556 error = change_mode(nd.ni_vp, SCARG(uap, mode), l); 2557 2558 vrele(nd.ni_vp); 2559 return (error); 2560 } 2561 2562 /* 2563 * Change mode of a file given a file descriptor. 2564 */ 2565 /* ARGSUSED */ 2566 int 2567 sys_fchmod(struct lwp *l, void *v, register_t *retval) 2568 { 2569 struct sys_fchmod_args /* { 2570 syscallarg(int) fd; 2571 syscallarg(int) mode; 2572 } */ *uap = v; 2573 struct proc *p = l->l_proc; 2574 struct file *fp; 2575 int error; 2576 2577 /* getvnode() will use the descriptor for us */ 2578 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2579 return (error); 2580 2581 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), l); 2582 FILE_UNUSE(fp, l); 2583 return (error); 2584 } 2585 2586 /* 2587 * Change mode of a file given path name; this version does not follow links. 2588 */ 2589 /* ARGSUSED */ 2590 int 2591 sys_lchmod(struct lwp *l, void *v, register_t *retval) 2592 { 2593 struct sys_lchmod_args /* { 2594 syscallarg(const char *) path; 2595 syscallarg(int) mode; 2596 } */ *uap = v; 2597 int error; 2598 struct nameidata nd; 2599 2600 NDINIT(&nd, LOOKUP, NOFOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2601 if ((error = namei(&nd)) != 0) 2602 return (error); 2603 2604 error = change_mode(nd.ni_vp, SCARG(uap, mode), l); 2605 2606 vrele(nd.ni_vp); 2607 return (error); 2608 } 2609 2610 /* 2611 * Common routine to set mode given a vnode. 2612 */ 2613 static int 2614 change_mode(struct vnode *vp, int mode, struct lwp *l) 2615 { 2616 struct vattr vattr; 2617 int error; 2618 2619 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2620 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2621 VATTR_NULL(&vattr); 2622 vattr.va_mode = mode & ALLPERMS; 2623 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 2624 VOP_UNLOCK(vp, 0); 2625 return (error); 2626 } 2627 2628 /* 2629 * Set ownership given a path name; this version follows links. 2630 */ 2631 /* ARGSUSED */ 2632 int 2633 sys_chown(struct lwp *l, void *v, register_t *retval) 2634 { 2635 struct sys_chown_args /* { 2636 syscallarg(const char *) path; 2637 syscallarg(uid_t) uid; 2638 syscallarg(gid_t) gid; 2639 } */ *uap = v; 2640 int error; 2641 struct nameidata nd; 2642 2643 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2644 if ((error = namei(&nd)) != 0) 2645 return (error); 2646 2647 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 2648 2649 vrele(nd.ni_vp); 2650 return (error); 2651 } 2652 2653 /* 2654 * Set ownership given a path name; this version follows links. 2655 * Provides POSIX semantics. 2656 */ 2657 /* ARGSUSED */ 2658 int 2659 sys___posix_chown(struct lwp *l, void *v, register_t *retval) 2660 { 2661 struct sys_chown_args /* { 2662 syscallarg(const char *) path; 2663 syscallarg(uid_t) uid; 2664 syscallarg(gid_t) gid; 2665 } */ *uap = v; 2666 int error; 2667 struct nameidata nd; 2668 2669 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2670 if ((error = namei(&nd)) != 0) 2671 return (error); 2672 2673 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 2674 2675 vrele(nd.ni_vp); 2676 return (error); 2677 } 2678 2679 /* 2680 * Set ownership given a file descriptor. 2681 */ 2682 /* ARGSUSED */ 2683 int 2684 sys_fchown(struct lwp *l, void *v, register_t *retval) 2685 { 2686 struct sys_fchown_args /* { 2687 syscallarg(int) fd; 2688 syscallarg(uid_t) uid; 2689 syscallarg(gid_t) gid; 2690 } */ *uap = v; 2691 struct proc *p = l->l_proc; 2692 int error; 2693 struct file *fp; 2694 2695 /* getvnode() will use the descriptor for us */ 2696 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2697 return (error); 2698 2699 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2700 SCARG(uap, gid), l, 0); 2701 FILE_UNUSE(fp, l); 2702 return (error); 2703 } 2704 2705 /* 2706 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2707 */ 2708 /* ARGSUSED */ 2709 int 2710 sys___posix_fchown(struct lwp *l, void *v, register_t *retval) 2711 { 2712 struct sys_fchown_args /* { 2713 syscallarg(int) fd; 2714 syscallarg(uid_t) uid; 2715 syscallarg(gid_t) gid; 2716 } */ *uap = v; 2717 struct proc *p = l->l_proc; 2718 int error; 2719 struct file *fp; 2720 2721 /* getvnode() will use the descriptor for us */ 2722 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2723 return (error); 2724 2725 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2726 SCARG(uap, gid), l, 1); 2727 FILE_UNUSE(fp, l); 2728 return (error); 2729 } 2730 2731 /* 2732 * Set ownership given a path name; this version does not follow links. 2733 */ 2734 /* ARGSUSED */ 2735 int 2736 sys_lchown(struct lwp *l, void *v, register_t *retval) 2737 { 2738 struct sys_lchown_args /* { 2739 syscallarg(const char *) path; 2740 syscallarg(uid_t) uid; 2741 syscallarg(gid_t) gid; 2742 } */ *uap = v; 2743 int error; 2744 struct nameidata nd; 2745 2746 NDINIT(&nd, LOOKUP, NOFOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2747 if ((error = namei(&nd)) != 0) 2748 return (error); 2749 2750 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 2751 2752 vrele(nd.ni_vp); 2753 return (error); 2754 } 2755 2756 /* 2757 * Set ownership given a path name; this version does not follow links. 2758 * Provides POSIX/XPG semantics. 2759 */ 2760 /* ARGSUSED */ 2761 int 2762 sys___posix_lchown(struct lwp *l, void *v, register_t *retval) 2763 { 2764 struct sys_lchown_args /* { 2765 syscallarg(const char *) path; 2766 syscallarg(uid_t) uid; 2767 syscallarg(gid_t) gid; 2768 } */ *uap = v; 2769 int error; 2770 struct nameidata nd; 2771 2772 NDINIT(&nd, LOOKUP, NOFOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2773 if ((error = namei(&nd)) != 0) 2774 return (error); 2775 2776 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 2777 2778 vrele(nd.ni_vp); 2779 return (error); 2780 } 2781 2782 /* 2783 * Common routine to set ownership given a vnode. 2784 */ 2785 static int 2786 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 2787 int posix_semantics) 2788 { 2789 struct vattr vattr; 2790 mode_t newmode; 2791 int error; 2792 2793 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2794 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2795 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred, l)) != 0) 2796 goto out; 2797 2798 #define CHANGED(x) ((int)(x) != -1) 2799 newmode = vattr.va_mode; 2800 if (posix_semantics) { 2801 /* 2802 * POSIX/XPG semantics: if the caller is not the super-user, 2803 * clear set-user-id and set-group-id bits. Both POSIX and 2804 * the XPG consider the behaviour for calls by the super-user 2805 * implementation-defined; we leave the set-user-id and set- 2806 * group-id settings intact in that case. 2807 */ 2808 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 2809 NULL) != 0) 2810 newmode &= ~(S_ISUID | S_ISGID); 2811 } else { 2812 /* 2813 * NetBSD semantics: when changing owner and/or group, 2814 * clear the respective bit(s). 2815 */ 2816 if (CHANGED(uid)) 2817 newmode &= ~S_ISUID; 2818 if (CHANGED(gid)) 2819 newmode &= ~S_ISGID; 2820 } 2821 /* Update va_mode iff altered. */ 2822 if (vattr.va_mode == newmode) 2823 newmode = VNOVAL; 2824 2825 VATTR_NULL(&vattr); 2826 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2827 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2828 vattr.va_mode = newmode; 2829 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 2830 #undef CHANGED 2831 2832 out: 2833 VOP_UNLOCK(vp, 0); 2834 return (error); 2835 } 2836 2837 /* 2838 * Set the access and modification times given a path name; this 2839 * version follows links. 2840 */ 2841 /* ARGSUSED */ 2842 int 2843 sys_utimes(struct lwp *l, void *v, register_t *retval) 2844 { 2845 struct sys_utimes_args /* { 2846 syscallarg(const char *) path; 2847 syscallarg(const struct timeval *) tptr; 2848 } */ *uap = v; 2849 2850 return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, 2851 SCARG(uap, tptr), UIO_USERSPACE); 2852 } 2853 2854 /* 2855 * Set the access and modification times given a file descriptor. 2856 */ 2857 /* ARGSUSED */ 2858 int 2859 sys_futimes(struct lwp *l, void *v, register_t *retval) 2860 { 2861 struct sys_futimes_args /* { 2862 syscallarg(int) fd; 2863 syscallarg(const struct timeval *) tptr; 2864 } */ *uap = v; 2865 int error; 2866 struct file *fp; 2867 2868 /* getvnode() will use the descriptor for us */ 2869 if ((error = getvnode(l->l_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 2870 return (error); 2871 2872 error = do_sys_utimes(l, fp->f_data, NULL, 0, 2873 SCARG(uap, tptr), UIO_USERSPACE); 2874 2875 FILE_UNUSE(fp, l); 2876 return (error); 2877 } 2878 2879 /* 2880 * Set the access and modification times given a path name; this 2881 * version does not follow links. 2882 */ 2883 int 2884 sys_lutimes(struct lwp *l, void *v, register_t *retval) 2885 { 2886 struct sys_lutimes_args /* { 2887 syscallarg(const char *) path; 2888 syscallarg(const struct timeval *) tptr; 2889 } */ *uap = v; 2890 2891 return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW, 2892 SCARG(uap, tptr), UIO_USERSPACE); 2893 } 2894 2895 /* 2896 * Common routine to set access and modification times given a vnode. 2897 */ 2898 int 2899 do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag, 2900 const struct timeval *tptr, enum uio_seg seg) 2901 { 2902 struct vattr vattr; 2903 struct nameidata nd; 2904 int error; 2905 2906 VATTR_NULL(&vattr); 2907 if (tptr == NULL) { 2908 nanotime(&vattr.va_atime); 2909 vattr.va_mtime = vattr.va_atime; 2910 vattr.va_vaflags |= VA_UTIMES_NULL; 2911 } else { 2912 struct timeval tv[2]; 2913 2914 if (seg != UIO_SYSSPACE) { 2915 error = copyin(tptr, &tv, sizeof (tv)); 2916 if (error != 0) 2917 return error; 2918 tptr = tv; 2919 } 2920 TIMEVAL_TO_TIMESPEC(tptr, &vattr.va_atime); 2921 TIMEVAL_TO_TIMESPEC(tptr + 1, &vattr.va_mtime); 2922 } 2923 2924 if (vp == NULL) { 2925 NDINIT(&nd, LOOKUP, flag | TRYEMULROOT, UIO_USERSPACE, path, l); 2926 if ((error = namei(&nd)) != 0) 2927 return (error); 2928 vp = nd.ni_vp; 2929 } else 2930 nd.ni_vp = NULL; 2931 2932 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2933 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2934 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 2935 VOP_UNLOCK(vp, 0); 2936 2937 if (nd.ni_vp != NULL) 2938 vrele(nd.ni_vp); 2939 2940 return (error); 2941 } 2942 2943 /* 2944 * Truncate a file given its path name. 2945 */ 2946 /* ARGSUSED */ 2947 int 2948 sys_truncate(struct lwp *l, void *v, register_t *retval) 2949 { 2950 struct sys_truncate_args /* { 2951 syscallarg(const char *) path; 2952 syscallarg(int) pad; 2953 syscallarg(off_t) length; 2954 } */ *uap = v; 2955 struct vnode *vp; 2956 struct vattr vattr; 2957 int error; 2958 struct nameidata nd; 2959 2960 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 2961 if ((error = namei(&nd)) != 0) 2962 return (error); 2963 vp = nd.ni_vp; 2964 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2965 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2966 if (vp->v_type == VDIR) 2967 error = EISDIR; 2968 else if ((error = vn_writechk(vp)) == 0 && 2969 (error = VOP_ACCESS(vp, VWRITE, l->l_cred, l)) == 0) { 2970 VATTR_NULL(&vattr); 2971 vattr.va_size = SCARG(uap, length); 2972 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 2973 } 2974 vput(vp); 2975 return (error); 2976 } 2977 2978 /* 2979 * Truncate a file given a file descriptor. 2980 */ 2981 /* ARGSUSED */ 2982 int 2983 sys_ftruncate(struct lwp *l, void *v, register_t *retval) 2984 { 2985 struct sys_ftruncate_args /* { 2986 syscallarg(int) fd; 2987 syscallarg(int) pad; 2988 syscallarg(off_t) length; 2989 } */ *uap = v; 2990 struct proc *p = l->l_proc; 2991 struct vattr vattr; 2992 struct vnode *vp; 2993 struct file *fp; 2994 int error; 2995 2996 /* getvnode() will use the descriptor for us */ 2997 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2998 return (error); 2999 if ((fp->f_flag & FWRITE) == 0) { 3000 error = EINVAL; 3001 goto out; 3002 } 3003 vp = (struct vnode *)fp->f_data; 3004 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 3005 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3006 if (vp->v_type == VDIR) 3007 error = EISDIR; 3008 else if ((error = vn_writechk(vp)) == 0) { 3009 VATTR_NULL(&vattr); 3010 vattr.va_size = SCARG(uap, length); 3011 error = VOP_SETATTR(vp, &vattr, fp->f_cred, l); 3012 } 3013 VOP_UNLOCK(vp, 0); 3014 out: 3015 FILE_UNUSE(fp, l); 3016 return (error); 3017 } 3018 3019 /* 3020 * Sync an open file. 3021 */ 3022 /* ARGSUSED */ 3023 int 3024 sys_fsync(struct lwp *l, void *v, register_t *retval) 3025 { 3026 struct sys_fsync_args /* { 3027 syscallarg(int) fd; 3028 } */ *uap = v; 3029 struct proc *p = l->l_proc; 3030 struct vnode *vp; 3031 struct file *fp; 3032 int error; 3033 3034 /* getvnode() will use the descriptor for us */ 3035 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3036 return (error); 3037 vp = (struct vnode *)fp->f_data; 3038 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3039 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, l); 3040 if (error == 0 && bioops.io_fsync != NULL && 3041 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3042 (*bioops.io_fsync)(vp, 0); 3043 VOP_UNLOCK(vp, 0); 3044 FILE_UNUSE(fp, l); 3045 return (error); 3046 } 3047 3048 /* 3049 * Sync a range of file data. API modeled after that found in AIX. 3050 * 3051 * FDATASYNC indicates that we need only save enough metadata to be able 3052 * to re-read the written data. Note we duplicate AIX's requirement that 3053 * the file be open for writing. 3054 */ 3055 /* ARGSUSED */ 3056 int 3057 sys_fsync_range(struct lwp *l, void *v, register_t *retval) 3058 { 3059 struct sys_fsync_range_args /* { 3060 syscallarg(int) fd; 3061 syscallarg(int) flags; 3062 syscallarg(off_t) start; 3063 syscallarg(off_t) length; 3064 } */ *uap = v; 3065 struct proc *p = l->l_proc; 3066 struct vnode *vp; 3067 struct file *fp; 3068 int flags, nflags; 3069 off_t s, e, len; 3070 int error; 3071 3072 /* getvnode() will use the descriptor for us */ 3073 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3074 return (error); 3075 3076 if ((fp->f_flag & FWRITE) == 0) { 3077 error = EBADF; 3078 goto out; 3079 } 3080 3081 flags = SCARG(uap, flags); 3082 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 3083 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 3084 error = EINVAL; 3085 goto out; 3086 } 3087 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 3088 if (flags & FDATASYNC) 3089 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 3090 else 3091 nflags = FSYNC_WAIT; 3092 if (flags & FDISKSYNC) 3093 nflags |= FSYNC_CACHE; 3094 3095 len = SCARG(uap, length); 3096 /* If length == 0, we do the whole file, and s = l = 0 will do that */ 3097 if (len) { 3098 s = SCARG(uap, start); 3099 e = s + len; 3100 if (e < s) { 3101 error = EINVAL; 3102 goto out; 3103 } 3104 } else { 3105 e = 0; 3106 s = 0; 3107 } 3108 3109 vp = (struct vnode *)fp->f_data; 3110 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3111 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e, l); 3112 3113 if (error == 0 && bioops.io_fsync != NULL && 3114 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3115 (*bioops.io_fsync)(vp, nflags); 3116 3117 VOP_UNLOCK(vp, 0); 3118 out: 3119 FILE_UNUSE(fp, l); 3120 return (error); 3121 } 3122 3123 /* 3124 * Sync the data of an open file. 3125 */ 3126 /* ARGSUSED */ 3127 int 3128 sys_fdatasync(struct lwp *l, void *v, register_t *retval) 3129 { 3130 struct sys_fdatasync_args /* { 3131 syscallarg(int) fd; 3132 } */ *uap = v; 3133 struct proc *p = l->l_proc; 3134 struct vnode *vp; 3135 struct file *fp; 3136 int error; 3137 3138 /* getvnode() will use the descriptor for us */ 3139 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3140 return (error); 3141 if ((fp->f_flag & FWRITE) == 0) { 3142 FILE_UNUSE(fp, l); 3143 return (EBADF); 3144 } 3145 vp = (struct vnode *)fp->f_data; 3146 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3147 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, l); 3148 VOP_UNLOCK(vp, 0); 3149 FILE_UNUSE(fp, l); 3150 return (error); 3151 } 3152 3153 /* 3154 * Rename files, (standard) BSD semantics frontend. 3155 */ 3156 /* ARGSUSED */ 3157 int 3158 sys_rename(struct lwp *l, void *v, register_t *retval) 3159 { 3160 struct sys_rename_args /* { 3161 syscallarg(const char *) from; 3162 syscallarg(const char *) to; 3163 } */ *uap = v; 3164 3165 return (rename_files(SCARG(uap, from), SCARG(uap, to), l, 0)); 3166 } 3167 3168 /* 3169 * Rename files, POSIX semantics frontend. 3170 */ 3171 /* ARGSUSED */ 3172 int 3173 sys___posix_rename(struct lwp *l, void *v, register_t *retval) 3174 { 3175 struct sys___posix_rename_args /* { 3176 syscallarg(const char *) from; 3177 syscallarg(const char *) to; 3178 } */ *uap = v; 3179 3180 return (rename_files(SCARG(uap, from), SCARG(uap, to), l, 1)); 3181 } 3182 3183 /* 3184 * Rename files. Source and destination must either both be directories, 3185 * or both not be directories. If target is a directory, it must be empty. 3186 * If `from' and `to' refer to the same object, the value of the `retain' 3187 * argument is used to determine whether `from' will be 3188 * 3189 * (retain == 0) deleted unless `from' and `to' refer to the same 3190 * object in the file system's name space (BSD). 3191 * (retain == 1) always retained (POSIX). 3192 */ 3193 static int 3194 rename_files(const char *from, const char *to, struct lwp *l, int retain) 3195 { 3196 struct vnode *tvp, *fvp, *tdvp; 3197 struct nameidata fromnd, tond; 3198 struct proc *p; 3199 int error; 3200 3201 NDINIT(&fromnd, DELETE, LOCKPARENT | SAVESTART | TRYEMULROOT, UIO_USERSPACE, 3202 from, l); 3203 if ((error = namei(&fromnd)) != 0) 3204 return (error); 3205 if (fromnd.ni_dvp != fromnd.ni_vp) 3206 VOP_UNLOCK(fromnd.ni_dvp, 0); 3207 fvp = fromnd.ni_vp; 3208 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | TRYEMULROOT | 3209 (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, l); 3210 if ((error = namei(&tond)) != 0) { 3211 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3212 vrele(fromnd.ni_dvp); 3213 vrele(fvp); 3214 goto out1; 3215 } 3216 tdvp = tond.ni_dvp; 3217 tvp = tond.ni_vp; 3218 3219 if (tvp != NULL) { 3220 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3221 error = ENOTDIR; 3222 goto out; 3223 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3224 error = EISDIR; 3225 goto out; 3226 } 3227 } 3228 3229 if (fvp == tdvp) 3230 error = EINVAL; 3231 3232 /* 3233 * Source and destination refer to the same object. 3234 */ 3235 if (fvp == tvp) { 3236 if (retain) 3237 error = -1; 3238 else if (fromnd.ni_dvp == tdvp && 3239 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3240 !memcmp(fromnd.ni_cnd.cn_nameptr, 3241 tond.ni_cnd.cn_nameptr, 3242 fromnd.ni_cnd.cn_namelen)) 3243 error = -1; 3244 } 3245 3246 #if NVERIEXEC > 0 3247 if (!error) { 3248 char *f1, *f2; 3249 3250 f1 = malloc(fromnd.ni_cnd.cn_namelen + 1, M_TEMP, M_WAITOK); 3251 strlcpy(f1, fromnd.ni_cnd.cn_nameptr, fromnd.ni_cnd.cn_namelen); 3252 3253 f2 = malloc(tond.ni_cnd.cn_namelen + 1, M_TEMP, M_WAITOK); 3254 strlcpy(f2, tond.ni_cnd.cn_nameptr, tond.ni_cnd.cn_namelen); 3255 3256 error = veriexec_renamechk(l, fvp, f1, tvp, f2); 3257 3258 free(f1, M_TEMP); 3259 free(f2, M_TEMP); 3260 } 3261 #endif /* NVERIEXEC > 0 */ 3262 3263 out: 3264 p = l->l_proc; 3265 if (!error) { 3266 VOP_LEASE(tdvp, l, l->l_cred, LEASE_WRITE); 3267 if (fromnd.ni_dvp != tdvp) 3268 VOP_LEASE(fromnd.ni_dvp, l, l->l_cred, LEASE_WRITE); 3269 if (tvp) { 3270 VOP_LEASE(tvp, l, l->l_cred, LEASE_WRITE); 3271 } 3272 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3273 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3274 } else { 3275 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3276 if (tdvp == tvp) 3277 vrele(tdvp); 3278 else 3279 vput(tdvp); 3280 if (tvp) 3281 vput(tvp); 3282 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3283 vrele(fromnd.ni_dvp); 3284 vrele(fvp); 3285 } 3286 vrele(tond.ni_startdir); 3287 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3288 out1: 3289 if (fromnd.ni_startdir) 3290 vrele(fromnd.ni_startdir); 3291 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3292 return (error == -1 ? 0 : error); 3293 } 3294 3295 /* 3296 * Make a directory file. 3297 */ 3298 /* ARGSUSED */ 3299 int 3300 sys_mkdir(struct lwp *l, void *v, register_t *retval) 3301 { 3302 struct sys_mkdir_args /* { 3303 syscallarg(const char *) path; 3304 syscallarg(int) mode; 3305 } */ *uap = v; 3306 struct proc *p = l->l_proc; 3307 struct vnode *vp; 3308 struct vattr vattr; 3309 int error; 3310 struct nameidata nd; 3311 3312 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT, UIO_USERSPACE, 3313 SCARG(uap, path), l); 3314 if ((error = namei(&nd)) != 0) 3315 return (error); 3316 vp = nd.ni_vp; 3317 if (vp != NULL) { 3318 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3319 if (nd.ni_dvp == vp) 3320 vrele(nd.ni_dvp); 3321 else 3322 vput(nd.ni_dvp); 3323 vrele(vp); 3324 return (EEXIST); 3325 } 3326 VATTR_NULL(&vattr); 3327 vattr.va_type = VDIR; 3328 vattr.va_mode = 3329 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3330 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 3331 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3332 if (!error) 3333 vput(nd.ni_vp); 3334 return (error); 3335 } 3336 3337 /* 3338 * Remove a directory file. 3339 */ 3340 /* ARGSUSED */ 3341 int 3342 sys_rmdir(struct lwp *l, void *v, register_t *retval) 3343 { 3344 struct sys_rmdir_args /* { 3345 syscallarg(const char *) path; 3346 } */ *uap = v; 3347 struct vnode *vp; 3348 int error; 3349 struct nameidata nd; 3350 3351 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 3352 SCARG(uap, path), l); 3353 if ((error = namei(&nd)) != 0) 3354 return (error); 3355 vp = nd.ni_vp; 3356 if (vp->v_type != VDIR) { 3357 error = ENOTDIR; 3358 goto out; 3359 } 3360 /* 3361 * No rmdir "." please. 3362 */ 3363 if (nd.ni_dvp == vp) { 3364 error = EINVAL; 3365 goto out; 3366 } 3367 /* 3368 * The root of a mounted filesystem cannot be deleted. 3369 */ 3370 if (vp->v_flag & VROOT) { 3371 error = EBUSY; 3372 goto out; 3373 } 3374 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 3375 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 3376 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3377 return (error); 3378 3379 out: 3380 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3381 if (nd.ni_dvp == vp) 3382 vrele(nd.ni_dvp); 3383 else 3384 vput(nd.ni_dvp); 3385 vput(vp); 3386 return (error); 3387 } 3388 3389 /* 3390 * Read a block of directory entries in a file system independent format. 3391 */ 3392 int 3393 sys___getdents30(struct lwp *l, void *v, register_t *retval) 3394 { 3395 struct sys___getdents30_args /* { 3396 syscallarg(int) fd; 3397 syscallarg(char *) buf; 3398 syscallarg(size_t) count; 3399 } */ *uap = v; 3400 struct proc *p = l->l_proc; 3401 struct file *fp; 3402 int error, done; 3403 3404 /* getvnode() will use the descriptor for us */ 3405 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3406 return (error); 3407 if ((fp->f_flag & FREAD) == 0) { 3408 error = EBADF; 3409 goto out; 3410 } 3411 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3412 SCARG(uap, count), &done, l, 0, 0); 3413 #ifdef KTRACE 3414 if (!error && KTRPOINT(p, KTR_GENIO)) { 3415 struct iovec iov; 3416 iov.iov_base = SCARG(uap, buf); 3417 iov.iov_len = done; 3418 ktrgenio(l, SCARG(uap, fd), UIO_READ, &iov, done, 0); 3419 } 3420 #endif 3421 *retval = done; 3422 out: 3423 FILE_UNUSE(fp, l); 3424 return (error); 3425 } 3426 3427 /* 3428 * Set the mode mask for creation of filesystem nodes. 3429 */ 3430 int 3431 sys_umask(struct lwp *l, void *v, register_t *retval) 3432 { 3433 struct sys_umask_args /* { 3434 syscallarg(mode_t) newmask; 3435 } */ *uap = v; 3436 struct proc *p = l->l_proc; 3437 struct cwdinfo *cwdi; 3438 3439 cwdi = p->p_cwdi; 3440 *retval = cwdi->cwdi_cmask; 3441 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3442 return (0); 3443 } 3444 3445 /* 3446 * Void all references to file by ripping underlying filesystem 3447 * away from vnode. 3448 */ 3449 /* ARGSUSED */ 3450 int 3451 sys_revoke(struct lwp *l, void *v, register_t *retval) 3452 { 3453 struct sys_revoke_args /* { 3454 syscallarg(const char *) path; 3455 } */ *uap = v; 3456 struct vnode *vp; 3457 struct vattr vattr; 3458 int error; 3459 struct nameidata nd; 3460 3461 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 3462 if ((error = namei(&nd)) != 0) 3463 return (error); 3464 vp = nd.ni_vp; 3465 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred, l)) != 0) 3466 goto out; 3467 if (kauth_cred_geteuid(l->l_cred) != vattr.va_uid && 3468 (error = kauth_authorize_generic(l->l_cred, 3469 KAUTH_GENERIC_ISSUSER, NULL)) != 0) 3470 goto out; 3471 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3472 VOP_REVOKE(vp, REVOKEALL); 3473 out: 3474 vrele(vp); 3475 return (error); 3476 } 3477 3478 /* 3479 * Convert a user file descriptor to a kernel file entry. 3480 */ 3481 int 3482 getvnode(struct filedesc *fdp, int fd, struct file **fpp) 3483 { 3484 struct vnode *vp; 3485 struct file *fp; 3486 3487 if ((fp = fd_getfile(fdp, fd)) == NULL) 3488 return (EBADF); 3489 3490 FILE_USE(fp); 3491 3492 if (fp->f_type != DTYPE_VNODE) { 3493 FILE_UNUSE(fp, NULL); 3494 return (EINVAL); 3495 } 3496 3497 vp = (struct vnode *)fp->f_data; 3498 if (vp->v_type == VBAD) { 3499 FILE_UNUSE(fp, NULL); 3500 return (EBADF); 3501 } 3502 3503 *fpp = fp; 3504 return (0); 3505 } 3506
Indexes created Thu Sep 25 16:09:42 GMT 2025