vfs_syscalls.c revision 1.350.2.5
1 /* $NetBSD: vfs_syscalls.c,v 1.350.2.5 2009/08/19 18:48:18 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * (c) UNIX System Laboratories, Inc. 36 * All or some portions of this file are derived from material licensed 37 * to the University of California by American Telephone and Telegraph 38 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 39 * the permission of UNIX System Laboratories, Inc. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 66 */ 67 68 #include <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.350.2.5 2009/08/19 18:48:18 yamt Exp $"); 70 71 #ifdef _KERNEL_OPT 72 #include "opt_fileassoc.h" 73 #include "veriexec.h" 74 #endif 75 76 #include <sys/param.h> 77 #include <sys/systm.h> 78 #include <sys/namei.h> 79 #include <sys/filedesc.h> 80 #include <sys/kernel.h> 81 #include <sys/file.h> 82 #include <sys/stat.h> 83 #include <sys/vnode.h> 84 #include <sys/mount.h> 85 #include <sys/proc.h> 86 #include <sys/uio.h> 87 #include <sys/kmem.h> 88 #include <sys/dirent.h> 89 #include <sys/sysctl.h> 90 #include <sys/syscallargs.h> 91 #include <sys/vfs_syscalls.h> 92 #include <sys/ktrace.h> 93 #ifdef FILEASSOC 94 #include <sys/fileassoc.h> 95 #endif /* FILEASSOC */ 96 #include <sys/verified_exec.h> 97 #include <sys/kauth.h> 98 #include <sys/atomic.h> 99 #include <sys/module.h> 100 #include <sys/buf.h> 101 102 #include <miscfs/genfs/genfs.h> 103 #include <miscfs/syncfs/syncfs.h> 104 #include <miscfs/specfs/specdev.h> 105 106 #include <nfs/rpcv2.h> 107 #include <nfs/nfsproto.h> 108 #include <nfs/nfs.h> 109 #include <nfs/nfs_var.h> 110 111 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 112 113 static int change_flags(struct vnode *, u_long, struct lwp *); 114 static int change_mode(struct vnode *, int, struct lwp *l); 115 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); 116 117 void checkdirs(struct vnode *); 118 119 /* 120 * Virtual File System System Calls 121 */ 122 123 /* 124 * Mount a file system. 125 */ 126 127 /* 128 * This table is used to maintain compatibility with 4.3BSD 129 * and NetBSD 0.9 mount syscalls - and possibly other systems. 130 * Note, the order is important! 131 * 132 * Do not modify this table. It should only contain filesystems 133 * supported by NetBSD 0.9 and 4.3BSD. 134 */ 135 const char * const mountcompatnames[] = { 136 NULL, /* 0 = MOUNT_NONE */ 137 MOUNT_FFS, /* 1 = MOUNT_UFS */ 138 MOUNT_NFS, /* 2 */ 139 MOUNT_MFS, /* 3 */ 140 MOUNT_MSDOS, /* 4 */ 141 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 142 MOUNT_FDESC, /* 6 */ 143 MOUNT_KERNFS, /* 7 */ 144 NULL, /* 8 = MOUNT_DEVFS */ 145 MOUNT_AFS, /* 9 */ 146 }; 147 const int nmountcompatnames = sizeof(mountcompatnames) / 148 sizeof(mountcompatnames[0]); 149 150 static int 151 mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags, 152 void *data, size_t *data_len) 153 { 154 struct mount *mp; 155 int error = 0, saved_flags; 156 157 mp = vp->v_mount; 158 saved_flags = mp->mnt_flag; 159 160 /* We can operate only on VV_ROOT nodes. */ 161 if ((vp->v_vflag & VV_ROOT) == 0) { 162 error = EINVAL; 163 goto out; 164 } 165 166 /* 167 * We only allow the filesystem to be reloaded if it 168 * is currently mounted read-only. Additionally, we 169 * prevent read-write to read-only downgrades. 170 */ 171 if ((flags & (MNT_RELOAD | MNT_RDONLY)) != 0 && 172 (mp->mnt_flag & MNT_RDONLY) == 0) { 173 error = EOPNOTSUPP; /* Needs translation */ 174 goto out; 175 } 176 177 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 178 KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data); 179 if (error) 180 goto out; 181 182 if (vfs_busy(mp, NULL)) { 183 error = EPERM; 184 goto out; 185 } 186 187 mutex_enter(&mp->mnt_updating); 188 189 mp->mnt_flag &= ~MNT_OP_FLAGS; 190 mp->mnt_flag |= flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 191 192 /* 193 * Set the mount level flags. 194 */ 195 if (flags & MNT_RDONLY) 196 mp->mnt_flag |= MNT_RDONLY; 197 else if (mp->mnt_flag & MNT_RDONLY) 198 mp->mnt_iflag |= IMNT_WANTRDWR; 199 mp->mnt_flag &= 200 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 201 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 202 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 203 MNT_LOG); 204 mp->mnt_flag |= flags & 205 (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 206 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 207 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 208 MNT_LOG | MNT_IGNORE); 209 210 error = VFS_MOUNT(mp, path, data, data_len); 211 212 if (error && data != NULL) { 213 int error2; 214 215 /* 216 * Update failed; let's try and see if it was an 217 * export request. For compat with 3.0 and earlier. 218 */ 219 error2 = vfs_hooks_reexport(mp, path, data); 220 221 /* 222 * Only update error code if the export request was 223 * understood but some problem occurred while 224 * processing it. 225 */ 226 if (error2 != EJUSTRETURN) 227 error = error2; 228 } 229 230 if (mp->mnt_iflag & IMNT_WANTRDWR) 231 mp->mnt_flag &= ~MNT_RDONLY; 232 if (error) 233 mp->mnt_flag = saved_flags; 234 mp->mnt_flag &= ~MNT_OP_FLAGS; 235 mp->mnt_iflag &= ~IMNT_WANTRDWR; 236 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 237 if (mp->mnt_syncer == NULL) 238 error = vfs_allocate_syncvnode(mp); 239 } else { 240 if (mp->mnt_syncer != NULL) 241 vfs_deallocate_syncvnode(mp); 242 } 243 mutex_exit(&mp->mnt_updating); 244 vfs_unbusy(mp, false, NULL); 245 246 out: 247 return (error); 248 } 249 250 static int 251 mount_get_vfsops(const char *fstype, struct vfsops **vfsops) 252 { 253 char fstypename[sizeof(((struct statvfs *)NULL)->f_fstypename)]; 254 int error; 255 256 /* Copy file-system type from userspace. */ 257 error = copyinstr(fstype, fstypename, sizeof(fstypename), NULL); 258 if (error) { 259 /* 260 * Historically, filesystem types were identified by numbers. 261 * If we get an integer for the filesystem type instead of a 262 * string, we check to see if it matches one of the historic 263 * filesystem types. 264 */ 265 u_long fsindex = (u_long)fstype; 266 if (fsindex >= nmountcompatnames || 267 mountcompatnames[fsindex] == NULL) 268 return ENODEV; 269 strlcpy(fstypename, mountcompatnames[fsindex], 270 sizeof(fstypename)); 271 } 272 273 /* Accept `ufs' as an alias for `ffs', for compatibility. */ 274 if (strcmp(fstypename, "ufs") == 0) 275 fstypename[0] = 'f'; 276 277 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 278 return 0; 279 280 /* If we can autoload a vfs module, try again */ 281 mutex_enter(&module_lock); 282 (void)module_autoload(fstype, MODULE_CLASS_VFS); 283 mutex_exit(&module_lock); 284 285 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 286 return 0; 287 288 return ENODEV; 289 } 290 291 static int 292 mount_domount(struct lwp *l, struct vnode **vpp, struct vfsops *vfsops, 293 const char *path, int flags, void *data, size_t *data_len, u_int recurse) 294 { 295 struct mount *mp; 296 struct vnode *vp = *vpp; 297 struct vattr va; 298 int error; 299 300 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 301 KAUTH_REQ_SYSTEM_MOUNT_NEW, vp, KAUTH_ARG(flags), data); 302 if (error) 303 return error; 304 305 /* Can't make a non-dir a mount-point (from here anyway). */ 306 if (vp->v_type != VDIR) 307 return ENOTDIR; 308 309 /* 310 * If the user is not root, ensure that they own the directory 311 * onto which we are attempting to mount. 312 */ 313 if ((error = VOP_GETATTR(vp, &va, l->l_cred)) != 0 || 314 (va.va_uid != kauth_cred_geteuid(l->l_cred) && 315 (error = kauth_authorize_generic(l->l_cred, 316 KAUTH_GENERIC_ISSUSER, NULL)) != 0)) { 317 return error; 318 } 319 320 if (flags & MNT_EXPORTED) 321 return EINVAL; 322 323 if ((error = vinvalbuf(vp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 324 return error; 325 326 /* 327 * Check if a file-system is not already mounted on this vnode. 328 */ 329 if (vp->v_mountedhere != NULL) 330 return EBUSY; 331 332 if ((mp = vfs_mountalloc(vfsops, vp)) == NULL) 333 return ENOMEM; 334 335 mp->mnt_stat.f_owner = kauth_cred_geteuid(l->l_cred); 336 337 /* 338 * The underlying file system may refuse the mount for 339 * various reasons. Allow the user to force it to happen. 340 * 341 * Set the mount level flags. 342 */ 343 mp->mnt_flag = flags & 344 (MNT_FORCE | MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 345 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 346 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 347 MNT_LOG | MNT_IGNORE | MNT_RDONLY); 348 349 mutex_enter(&mp->mnt_updating); 350 error = VFS_MOUNT(mp, path, data, data_len); 351 mp->mnt_flag &= ~MNT_OP_FLAGS; 352 353 /* 354 * Put the new filesystem on the mount list after root. 355 */ 356 cache_purge(vp); 357 if (error != 0) { 358 vp->v_mountedhere = NULL; 359 mutex_exit(&mp->mnt_updating); 360 vfs_unbusy(mp, false, NULL); 361 vfs_destroy(mp); 362 return error; 363 } 364 365 mp->mnt_iflag &= ~IMNT_WANTRDWR; 366 mutex_enter(&mountlist_lock); 367 vp->v_mountedhere = mp; 368 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 369 mutex_exit(&mountlist_lock); 370 vn_restorerecurse(vp, recurse); 371 VOP_UNLOCK(vp, 0); 372 checkdirs(vp); 373 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 374 error = vfs_allocate_syncvnode(mp); 375 /* Hold an additional reference to the mount across VFS_START(). */ 376 mutex_exit(&mp->mnt_updating); 377 vfs_unbusy(mp, true, NULL); 378 (void) VFS_STATVFS(mp, &mp->mnt_stat); 379 error = VFS_START(mp, 0); 380 if (error) 381 vrele(vp); 382 /* Drop reference held for VFS_START(). */ 383 vfs_destroy(mp); 384 *vpp = NULL; 385 return error; 386 } 387 388 static int 389 mount_getargs(struct lwp *l, struct vnode *vp, const char *path, int flags, 390 void *data, size_t *data_len) 391 { 392 struct mount *mp; 393 int error; 394 395 /* If MNT_GETARGS is specified, it should be the only flag. */ 396 if (flags & ~MNT_GETARGS) 397 return EINVAL; 398 399 mp = vp->v_mount; 400 401 /* XXX: probably some notion of "can see" here if we want isolation. */ 402 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 403 KAUTH_REQ_SYSTEM_MOUNT_GET, mp, data, NULL); 404 if (error) 405 return error; 406 407 if ((vp->v_vflag & VV_ROOT) == 0) 408 return EINVAL; 409 410 if (vfs_busy(mp, NULL)) 411 return EPERM; 412 413 mutex_enter(&mp->mnt_updating); 414 mp->mnt_flag &= ~MNT_OP_FLAGS; 415 mp->mnt_flag |= MNT_GETARGS; 416 error = VFS_MOUNT(mp, path, data, data_len); 417 mp->mnt_flag &= ~MNT_OP_FLAGS; 418 mutex_exit(&mp->mnt_updating); 419 420 vfs_unbusy(mp, false, NULL); 421 return (error); 422 } 423 424 int 425 sys___mount50(struct lwp *l, const struct sys___mount50_args *uap, register_t *retval) 426 { 427 /* { 428 syscallarg(const char *) type; 429 syscallarg(const char *) path; 430 syscallarg(int) flags; 431 syscallarg(void *) data; 432 syscallarg(size_t) data_len; 433 } */ 434 435 return do_sys_mount(l, NULL, SCARG(uap, type), SCARG(uap, path), 436 SCARG(uap, flags), SCARG(uap, data), UIO_USERSPACE, 437 SCARG(uap, data_len), retval); 438 } 439 440 int 441 do_sys_mount(struct lwp *l, struct vfsops *vfsops, const char *type, 442 const char *path, int flags, void *data, enum uio_seg data_seg, 443 size_t data_len, register_t *retval) 444 { 445 struct vnode *vp; 446 void *data_buf = data; 447 u_int recurse; 448 int error; 449 450 /* 451 * Get vnode to be covered 452 */ 453 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 454 if (error != 0) 455 return (error); 456 457 /* 458 * A lookup in VFS_MOUNT might result in an attempt to 459 * lock this vnode again, so make the lock recursive. 460 */ 461 if (vfsops == NULL) { 462 if (flags & (MNT_GETARGS | MNT_UPDATE)) { 463 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 464 recurse = vn_setrecurse(vp); 465 vfsops = vp->v_mount->mnt_op; 466 } else { 467 /* 'type' is userspace */ 468 error = mount_get_vfsops(type, &vfsops); 469 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 470 recurse = vn_setrecurse(vp); 471 if (error != 0) 472 goto done; 473 } 474 } else { 475 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 476 recurse = vn_setrecurse(vp); 477 } 478 479 if (data != NULL && data_seg == UIO_USERSPACE) { 480 if (data_len == 0) { 481 /* No length supplied, use default for filesystem */ 482 data_len = vfsops->vfs_min_mount_data; 483 if (data_len > VFS_MAX_MOUNT_DATA) { 484 error = EINVAL; 485 goto done; 486 } 487 /* 488 * Hopefully a longer buffer won't make copyin() fail. 489 * For compatibility with 3.0 and earlier. 490 */ 491 if (flags & MNT_UPDATE 492 && data_len < sizeof (struct mnt_export_args30)) 493 data_len = sizeof (struct mnt_export_args30); 494 } 495 data_buf = kmem_alloc(data_len, KM_SLEEP); 496 497 /* NFS needs the buffer even for mnt_getargs .... */ 498 error = copyin(data, data_buf, data_len); 499 if (error != 0) 500 goto done; 501 } 502 503 if (flags & MNT_GETARGS) { 504 if (data_len == 0) { 505 error = EINVAL; 506 goto done; 507 } 508 error = mount_getargs(l, vp, path, flags, data_buf, &data_len); 509 if (error != 0) 510 goto done; 511 if (data_seg == UIO_USERSPACE) 512 error = copyout(data_buf, data, data_len); 513 *retval = data_len; 514 } else if (flags & MNT_UPDATE) { 515 error = mount_update(l, vp, path, flags, data_buf, &data_len); 516 } else { 517 /* Locking is handled internally in mount_domount(). */ 518 error = mount_domount(l, &vp, vfsops, path, flags, data_buf, 519 &data_len, recurse); 520 } 521 522 done: 523 if (vp != NULL) { 524 vn_restorerecurse(vp, recurse); 525 vput(vp); 526 } 527 if (data_buf != data) 528 kmem_free(data_buf, data_len); 529 return (error); 530 } 531 532 /* 533 * Scan all active processes to see if any of them have a current 534 * or root directory onto which the new filesystem has just been 535 * mounted. If so, replace them with the new mount point. 536 */ 537 void 538 checkdirs(struct vnode *olddp) 539 { 540 struct cwdinfo *cwdi; 541 struct vnode *newdp, *rele1, *rele2; 542 struct proc *p; 543 bool retry; 544 545 if (olddp->v_usecount == 1) 546 return; 547 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 548 panic("mount: lost mount"); 549 550 do { 551 retry = false; 552 mutex_enter(proc_lock); 553 PROCLIST_FOREACH(p, &allproc) { 554 if ((p->p_flag & PK_MARKER) != 0) 555 continue; 556 if ((cwdi = p->p_cwdi) == NULL) 557 continue; 558 /* 559 * Can't change to the old directory any more, 560 * so even if we see a stale value it's not a 561 * problem. 562 */ 563 if (cwdi->cwdi_cdir != olddp && 564 cwdi->cwdi_rdir != olddp) 565 continue; 566 retry = true; 567 rele1 = NULL; 568 rele2 = NULL; 569 atomic_inc_uint(&cwdi->cwdi_refcnt); 570 mutex_exit(proc_lock); 571 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 572 if (cwdi->cwdi_cdir == olddp) { 573 rele1 = cwdi->cwdi_cdir; 574 VREF(newdp); 575 cwdi->cwdi_cdir = newdp; 576 } 577 if (cwdi->cwdi_rdir == olddp) { 578 rele2 = cwdi->cwdi_rdir; 579 VREF(newdp); 580 cwdi->cwdi_rdir = newdp; 581 } 582 rw_exit(&cwdi->cwdi_lock); 583 cwdfree(cwdi); 584 if (rele1 != NULL) 585 vrele(rele1); 586 if (rele2 != NULL) 587 vrele(rele2); 588 mutex_enter(proc_lock); 589 break; 590 } 591 mutex_exit(proc_lock); 592 } while (retry); 593 594 if (rootvnode == olddp) { 595 vrele(rootvnode); 596 VREF(newdp); 597 rootvnode = newdp; 598 } 599 vput(newdp); 600 } 601 602 /* 603 * Unmount a file system. 604 * 605 * Note: unmount takes a path to the vnode mounted on as argument, 606 * not special file (as before). 607 */ 608 /* ARGSUSED */ 609 int 610 sys_unmount(struct lwp *l, const struct sys_unmount_args *uap, register_t *retval) 611 { 612 /* { 613 syscallarg(const char *) path; 614 syscallarg(int) flags; 615 } */ 616 struct vnode *vp; 617 struct mount *mp; 618 int error; 619 struct nameidata nd; 620 621 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 622 SCARG(uap, path)); 623 if ((error = namei(&nd)) != 0) 624 return (error); 625 vp = nd.ni_vp; 626 mp = vp->v_mount; 627 atomic_inc_uint(&mp->mnt_refcnt); 628 VOP_UNLOCK(vp, 0); 629 630 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 631 KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT, mp, NULL, NULL); 632 if (error) { 633 vrele(vp); 634 vfs_destroy(mp); 635 return (error); 636 } 637 638 /* 639 * Don't allow unmounting the root file system. 640 */ 641 if (mp->mnt_flag & MNT_ROOTFS) { 642 vrele(vp); 643 vfs_destroy(mp); 644 return (EINVAL); 645 } 646 647 /* 648 * Must be the root of the filesystem 649 */ 650 if ((vp->v_vflag & VV_ROOT) == 0) { 651 vrele(vp); 652 vfs_destroy(mp); 653 return (EINVAL); 654 } 655 656 vrele(vp); 657 error = dounmount(mp, SCARG(uap, flags), l); 658 vfs_destroy(mp); 659 return error; 660 } 661 662 /* 663 * Do the actual file system unmount. File system is assumed to have 664 * been locked by the caller. 665 * 666 * => Caller hold reference to the mount, explicitly for dounmount(). 667 */ 668 int 669 dounmount(struct mount *mp, int flags, struct lwp *l) 670 { 671 struct vnode *coveredvp; 672 int error; 673 int async; 674 int used_syncer; 675 676 #if NVERIEXEC > 0 677 error = veriexec_unmountchk(mp); 678 if (error) 679 return (error); 680 #endif /* NVERIEXEC > 0 */ 681 682 /* 683 * XXX Freeze syncer. Must do this before locking the 684 * mount point. See dounmount() for details. 685 */ 686 mutex_enter(&syncer_mutex); 687 rw_enter(&mp->mnt_unmounting, RW_WRITER); 688 if ((mp->mnt_iflag & IMNT_GONE) != 0) { 689 rw_exit(&mp->mnt_unmounting); 690 mutex_exit(&syncer_mutex); 691 return ENOENT; 692 } 693 694 used_syncer = (mp->mnt_syncer != NULL); 695 696 /* 697 * XXX Syncer must be frozen when we get here. This should really 698 * be done on a per-mountpoint basis, but the syncer doesn't work 699 * like that. 700 * 701 * The caller of dounmount() must acquire syncer_mutex because 702 * the syncer itself acquires locks in syncer_mutex -> vfs_busy 703 * order, and we must preserve that order to avoid deadlock. 704 * 705 * So, if the file system did not use the syncer, now is 706 * the time to release the syncer_mutex. 707 */ 708 if (used_syncer == 0) 709 mutex_exit(&syncer_mutex); 710 711 mp->mnt_iflag |= IMNT_UNMOUNT; 712 async = mp->mnt_flag & MNT_ASYNC; 713 mp->mnt_flag &= ~MNT_ASYNC; 714 cache_purgevfs(mp); /* remove cache entries for this file sys */ 715 if (mp->mnt_syncer != NULL) 716 vfs_deallocate_syncvnode(mp); 717 error = 0; 718 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 719 error = VFS_SYNC(mp, MNT_WAIT, l->l_cred); 720 } 721 vfs_scrubvnlist(mp); 722 if (error == 0 || (flags & MNT_FORCE)) 723 error = VFS_UNMOUNT(mp, flags); 724 if (error) { 725 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 726 (void) vfs_allocate_syncvnode(mp); 727 mp->mnt_iflag &= ~IMNT_UNMOUNT; 728 mp->mnt_flag |= async; 729 rw_exit(&mp->mnt_unmounting); 730 if (used_syncer) 731 mutex_exit(&syncer_mutex); 732 return (error); 733 } 734 vfs_scrubvnlist(mp); 735 mutex_enter(&mountlist_lock); 736 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) 737 coveredvp->v_mountedhere = NULL; 738 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 739 mp->mnt_iflag |= IMNT_GONE; 740 mutex_exit(&mountlist_lock); 741 if (TAILQ_FIRST(&mp->mnt_vnodelist) != NULL) 742 panic("unmount: dangling vnode"); 743 if (used_syncer) 744 mutex_exit(&syncer_mutex); 745 vfs_hooks_unmount(mp); 746 rw_exit(&mp->mnt_unmounting); 747 vfs_destroy(mp); /* reference from mount() */ 748 if (coveredvp != NULLVP) 749 vrele(coveredvp); 750 return (0); 751 } 752 753 /* 754 * Sync each mounted filesystem. 755 */ 756 #ifdef DEBUG 757 int syncprt = 0; 758 struct ctldebug debug0 = { "syncprt", &syncprt }; 759 #endif 760 761 /* ARGSUSED */ 762 int 763 sys_sync(struct lwp *l, const void *v, register_t *retval) 764 { 765 struct mount *mp, *nmp; 766 int asyncflag; 767 768 if (l == NULL) 769 l = &lwp0; 770 771 mutex_enter(&mountlist_lock); 772 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 773 mp = nmp) { 774 if (vfs_busy(mp, &nmp)) { 775 continue; 776 } 777 mutex_enter(&mp->mnt_updating); 778 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 779 asyncflag = mp->mnt_flag & MNT_ASYNC; 780 mp->mnt_flag &= ~MNT_ASYNC; 781 VFS_SYNC(mp, MNT_NOWAIT, l->l_cred); 782 if (asyncflag) 783 mp->mnt_flag |= MNT_ASYNC; 784 } 785 mutex_exit(&mp->mnt_updating); 786 vfs_unbusy(mp, false, &nmp); 787 } 788 mutex_exit(&mountlist_lock); 789 #ifdef DEBUG 790 if (syncprt) 791 vfs_bufstats(); 792 #endif /* DEBUG */ 793 return (0); 794 } 795 796 /* 797 * Change filesystem quotas. 798 */ 799 /* ARGSUSED */ 800 int 801 sys_quotactl(struct lwp *l, const struct sys_quotactl_args *uap, register_t *retval) 802 { 803 /* { 804 syscallarg(const char *) path; 805 syscallarg(int) cmd; 806 syscallarg(int) uid; 807 syscallarg(void *) arg; 808 } */ 809 struct mount *mp; 810 int error; 811 struct vnode *vp; 812 813 error = namei_simple_user(SCARG(uap, path), 814 NSM_FOLLOW_TRYEMULROOT, &vp); 815 if (error != 0) 816 return (error); 817 mp = vp->v_mount; 818 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 819 SCARG(uap, arg)); 820 vrele(vp); 821 return (error); 822 } 823 824 int 825 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 826 int root) 827 { 828 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 829 int error = 0; 830 831 /* 832 * If MNT_NOWAIT or MNT_LAZY is specified, do not 833 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 834 * overrides MNT_NOWAIT. 835 */ 836 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 837 (flags != MNT_WAIT && flags != 0)) { 838 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 839 goto done; 840 } 841 842 /* Get the filesystem stats now */ 843 memset(sp, 0, sizeof(*sp)); 844 if ((error = VFS_STATVFS(mp, sp)) != 0) { 845 return error; 846 } 847 848 if (cwdi->cwdi_rdir == NULL) 849 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 850 done: 851 if (cwdi->cwdi_rdir != NULL) { 852 size_t len; 853 char *bp; 854 char c; 855 char *path = PNBUF_GET(); 856 857 bp = path + MAXPATHLEN; 858 *--bp = '\0'; 859 rw_enter(&cwdi->cwdi_lock, RW_READER); 860 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 861 MAXPATHLEN / 2, 0, l); 862 rw_exit(&cwdi->cwdi_lock); 863 if (error) { 864 PNBUF_PUT(path); 865 return error; 866 } 867 len = strlen(bp); 868 if (len != 1) { 869 /* 870 * for mount points that are below our root, we can see 871 * them, so we fix up the pathname and return them. The 872 * rest we cannot see, so we don't allow viewing the 873 * data. 874 */ 875 if (strncmp(bp, sp->f_mntonname, len) == 0 && 876 ((c = sp->f_mntonname[len]) == '/' || c == '\0')) { 877 (void)strlcpy(sp->f_mntonname, 878 c == '\0' ? "/" : &sp->f_mntonname[len], 879 sizeof(sp->f_mntonname)); 880 } else { 881 if (root) 882 (void)strlcpy(sp->f_mntonname, "/", 883 sizeof(sp->f_mntonname)); 884 else 885 error = EPERM; 886 } 887 } 888 PNBUF_PUT(path); 889 } 890 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 891 return error; 892 } 893 894 /* 895 * Get filesystem statistics by path. 896 */ 897 int 898 do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb) 899 { 900 struct mount *mp; 901 int error; 902 struct vnode *vp; 903 904 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 905 if (error != 0) 906 return error; 907 mp = vp->v_mount; 908 error = dostatvfs(mp, sb, l, flags, 1); 909 vrele(vp); 910 return error; 911 } 912 913 /* ARGSUSED */ 914 int 915 sys_statvfs1(struct lwp *l, const struct sys_statvfs1_args *uap, register_t *retval) 916 { 917 /* { 918 syscallarg(const char *) path; 919 syscallarg(struct statvfs *) buf; 920 syscallarg(int) flags; 921 } */ 922 struct statvfs *sb; 923 int error; 924 925 sb = STATVFSBUF_GET(); 926 error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb); 927 if (error == 0) 928 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 929 STATVFSBUF_PUT(sb); 930 return error; 931 } 932 933 /* 934 * Get filesystem statistics by fd. 935 */ 936 int 937 do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb) 938 { 939 file_t *fp; 940 struct mount *mp; 941 int error; 942 943 /* fd_getvnode() will use the descriptor for us */ 944 if ((error = fd_getvnode(fd, &fp)) != 0) 945 return (error); 946 mp = ((struct vnode *)fp->f_data)->v_mount; 947 error = dostatvfs(mp, sb, curlwp, flags, 1); 948 fd_putfile(fd); 949 return error; 950 } 951 952 /* ARGSUSED */ 953 int 954 sys_fstatvfs1(struct lwp *l, const struct sys_fstatvfs1_args *uap, register_t *retval) 955 { 956 /* { 957 syscallarg(int) fd; 958 syscallarg(struct statvfs *) buf; 959 syscallarg(int) flags; 960 } */ 961 struct statvfs *sb; 962 int error; 963 964 sb = STATVFSBUF_GET(); 965 error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb); 966 if (error == 0) 967 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 968 STATVFSBUF_PUT(sb); 969 return error; 970 } 971 972 973 /* 974 * Get statistics on all filesystems. 975 */ 976 int 977 do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags, 978 int (*copyfn)(const void *, void *, size_t), size_t entry_sz, 979 register_t *retval) 980 { 981 int root = 0; 982 struct proc *p = l->l_proc; 983 struct mount *mp, *nmp; 984 struct statvfs *sb; 985 size_t count, maxcount; 986 int error = 0; 987 988 sb = STATVFSBUF_GET(); 989 maxcount = bufsize / entry_sz; 990 mutex_enter(&mountlist_lock); 991 count = 0; 992 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 993 mp = nmp) { 994 if (vfs_busy(mp, &nmp)) { 995 continue; 996 } 997 if (sfsp && count < maxcount) { 998 error = dostatvfs(mp, sb, l, flags, 0); 999 if (error) { 1000 vfs_unbusy(mp, false, &nmp); 1001 error = 0; 1002 continue; 1003 } 1004 error = copyfn(sb, sfsp, entry_sz); 1005 if (error) { 1006 vfs_unbusy(mp, false, NULL); 1007 goto out; 1008 } 1009 sfsp = (char *)sfsp + entry_sz; 1010 root |= strcmp(sb->f_mntonname, "/") == 0; 1011 } 1012 count++; 1013 vfs_unbusy(mp, false, &nmp); 1014 } 1015 mutex_exit(&mountlist_lock); 1016 1017 if (root == 0 && p->p_cwdi->cwdi_rdir) { 1018 /* 1019 * fake a root entry 1020 */ 1021 error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, 1022 sb, l, flags, 1); 1023 if (error != 0) 1024 goto out; 1025 if (sfsp) { 1026 error = copyfn(sb, sfsp, entry_sz); 1027 if (error != 0) 1028 goto out; 1029 } 1030 count++; 1031 } 1032 if (sfsp && count > maxcount) 1033 *retval = maxcount; 1034 else 1035 *retval = count; 1036 out: 1037 STATVFSBUF_PUT(sb); 1038 return error; 1039 } 1040 1041 int 1042 sys_getvfsstat(struct lwp *l, const struct sys_getvfsstat_args *uap, register_t *retval) 1043 { 1044 /* { 1045 syscallarg(struct statvfs *) buf; 1046 syscallarg(size_t) bufsize; 1047 syscallarg(int) flags; 1048 } */ 1049 1050 return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize), 1051 SCARG(uap, flags), copyout, sizeof (struct statvfs), retval); 1052 } 1053 1054 /* 1055 * Change current working directory to a given file descriptor. 1056 */ 1057 /* ARGSUSED */ 1058 int 1059 sys_fchdir(struct lwp *l, const struct sys_fchdir_args *uap, register_t *retval) 1060 { 1061 /* { 1062 syscallarg(int) fd; 1063 } */ 1064 struct proc *p = l->l_proc; 1065 struct cwdinfo *cwdi; 1066 struct vnode *vp, *tdp; 1067 struct mount *mp; 1068 file_t *fp; 1069 int error, fd; 1070 1071 /* fd_getvnode() will use the descriptor for us */ 1072 fd = SCARG(uap, fd); 1073 if ((error = fd_getvnode(fd, &fp)) != 0) 1074 return (error); 1075 vp = fp->f_data; 1076 1077 VREF(vp); 1078 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1079 if (vp->v_type != VDIR) 1080 error = ENOTDIR; 1081 else 1082 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1083 if (error) { 1084 vput(vp); 1085 goto out; 1086 } 1087 while ((mp = vp->v_mountedhere) != NULL) { 1088 error = vfs_busy(mp, NULL); 1089 vput(vp); 1090 if (error != 0) 1091 goto out; 1092 error = VFS_ROOT(mp, &tdp); 1093 vfs_unbusy(mp, false, NULL); 1094 if (error) 1095 goto out; 1096 vp = tdp; 1097 } 1098 VOP_UNLOCK(vp, 0); 1099 1100 /* 1101 * Disallow changing to a directory not under the process's 1102 * current root directory (if there is one). 1103 */ 1104 cwdi = p->p_cwdi; 1105 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1106 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 1107 vrele(vp); 1108 error = EPERM; /* operation not permitted */ 1109 } else { 1110 vrele(cwdi->cwdi_cdir); 1111 cwdi->cwdi_cdir = vp; 1112 } 1113 rw_exit(&cwdi->cwdi_lock); 1114 1115 out: 1116 fd_putfile(fd); 1117 return (error); 1118 } 1119 1120 /* 1121 * Change this process's notion of the root directory to a given file 1122 * descriptor. 1123 */ 1124 int 1125 sys_fchroot(struct lwp *l, const struct sys_fchroot_args *uap, register_t *retval) 1126 { 1127 struct proc *p = l->l_proc; 1128 struct vnode *vp; 1129 file_t *fp; 1130 int error, fd = SCARG(uap, fd); 1131 1132 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1133 KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) 1134 return error; 1135 /* fd_getvnode() will use the descriptor for us */ 1136 if ((error = fd_getvnode(fd, &fp)) != 0) 1137 return error; 1138 vp = fp->f_data; 1139 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1140 if (vp->v_type != VDIR) 1141 error = ENOTDIR; 1142 else 1143 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1144 VOP_UNLOCK(vp, 0); 1145 if (error) 1146 goto out; 1147 VREF(vp); 1148 1149 change_root(p->p_cwdi, vp, l); 1150 1151 out: 1152 fd_putfile(fd); 1153 return (error); 1154 } 1155 1156 /* 1157 * Change current working directory (``.''). 1158 */ 1159 /* ARGSUSED */ 1160 int 1161 sys_chdir(struct lwp *l, const struct sys_chdir_args *uap, register_t *retval) 1162 { 1163 /* { 1164 syscallarg(const char *) path; 1165 } */ 1166 struct proc *p = l->l_proc; 1167 struct cwdinfo *cwdi; 1168 int error; 1169 struct vnode *vp; 1170 1171 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1172 &vp, l)) != 0) 1173 return (error); 1174 cwdi = p->p_cwdi; 1175 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1176 vrele(cwdi->cwdi_cdir); 1177 cwdi->cwdi_cdir = vp; 1178 rw_exit(&cwdi->cwdi_lock); 1179 return (0); 1180 } 1181 1182 /* 1183 * Change notion of root (``/'') directory. 1184 */ 1185 /* ARGSUSED */ 1186 int 1187 sys_chroot(struct lwp *l, const struct sys_chroot_args *uap, register_t *retval) 1188 { 1189 /* { 1190 syscallarg(const char *) path; 1191 } */ 1192 struct proc *p = l->l_proc; 1193 int error; 1194 struct vnode *vp; 1195 1196 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1197 KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) 1198 return (error); 1199 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1200 &vp, l)) != 0) 1201 return (error); 1202 1203 change_root(p->p_cwdi, vp, l); 1204 1205 return (0); 1206 } 1207 1208 /* 1209 * Common routine for chroot and fchroot. 1210 * NB: callers need to properly authorize the change root operation. 1211 */ 1212 void 1213 change_root(struct cwdinfo *cwdi, struct vnode *vp, struct lwp *l) 1214 { 1215 1216 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1217 if (cwdi->cwdi_rdir != NULL) 1218 vrele(cwdi->cwdi_rdir); 1219 cwdi->cwdi_rdir = vp; 1220 1221 /* 1222 * Prevent escaping from chroot by putting the root under 1223 * the working directory. Silently chdir to / if we aren't 1224 * already there. 1225 */ 1226 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1227 /* 1228 * XXX would be more failsafe to change directory to a 1229 * deadfs node here instead 1230 */ 1231 vrele(cwdi->cwdi_cdir); 1232 VREF(vp); 1233 cwdi->cwdi_cdir = vp; 1234 } 1235 rw_exit(&cwdi->cwdi_lock); 1236 } 1237 1238 /* 1239 * Common routine for chroot and chdir. 1240 */ 1241 int 1242 chdir_lookup(const char *path, int where, struct vnode **vpp, struct lwp *l) 1243 { 1244 struct nameidata nd; 1245 int error; 1246 1247 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, where, 1248 path); 1249 if ((error = namei(&nd)) != 0) 1250 return (error); 1251 *vpp = nd.ni_vp; 1252 if ((*vpp)->v_type != VDIR) 1253 error = ENOTDIR; 1254 else 1255 error = VOP_ACCESS(*vpp, VEXEC, l->l_cred); 1256 1257 if (error) 1258 vput(*vpp); 1259 else 1260 VOP_UNLOCK(*vpp, 0); 1261 return (error); 1262 } 1263 1264 /* 1265 * Check permissions, allocate an open file structure, 1266 * and call the device open routine if any. 1267 */ 1268 int 1269 sys_open(struct lwp *l, const struct sys_open_args *uap, register_t *retval) 1270 { 1271 /* { 1272 syscallarg(const char *) path; 1273 syscallarg(int) flags; 1274 syscallarg(int) mode; 1275 } */ 1276 struct proc *p = l->l_proc; 1277 struct cwdinfo *cwdi = p->p_cwdi; 1278 file_t *fp; 1279 struct vnode *vp; 1280 int flags, cmode; 1281 int type, indx, error; 1282 struct flock lf; 1283 struct nameidata nd; 1284 1285 flags = FFLAGS(SCARG(uap, flags)); 1286 if ((flags & (FREAD | FWRITE)) == 0) 1287 return (EINVAL); 1288 if ((error = fd_allocfile(&fp, &indx)) != 0) 1289 return (error); 1290 /* We're going to read cwdi->cwdi_cmask unlocked here. */ 1291 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1292 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, 1293 SCARG(uap, path)); 1294 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1295 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1296 fd_abort(p, fp, indx); 1297 if ((error == EDUPFD || error == EMOVEFD) && 1298 l->l_dupfd >= 0 && /* XXX from fdopen */ 1299 (error = 1300 fd_dupopen(l->l_dupfd, &indx, flags, error)) == 0) { 1301 *retval = indx; 1302 return (0); 1303 } 1304 if (error == ERESTART) 1305 error = EINTR; 1306 return (error); 1307 } 1308 1309 l->l_dupfd = 0; 1310 vp = nd.ni_vp; 1311 fp->f_flag = flags & FMASK; 1312 fp->f_type = DTYPE_VNODE; 1313 fp->f_ops = &vnops; 1314 fp->f_data = vp; 1315 if (flags & (O_EXLOCK | O_SHLOCK)) { 1316 lf.l_whence = SEEK_SET; 1317 lf.l_start = 0; 1318 lf.l_len = 0; 1319 if (flags & O_EXLOCK) 1320 lf.l_type = F_WRLCK; 1321 else 1322 lf.l_type = F_RDLCK; 1323 type = F_FLOCK; 1324 if ((flags & FNONBLOCK) == 0) 1325 type |= F_WAIT; 1326 VOP_UNLOCK(vp, 0); 1327 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1328 if (error) { 1329 (void) vn_close(vp, fp->f_flag, fp->f_cred); 1330 fd_abort(p, fp, indx); 1331 return (error); 1332 } 1333 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1334 atomic_or_uint(&fp->f_flag, FHASLOCK); 1335 } 1336 VOP_UNLOCK(vp, 0); 1337 *retval = indx; 1338 fd_affix(p, fp, indx); 1339 return (0); 1340 } 1341 1342 static void 1343 vfs__fhfree(fhandle_t *fhp) 1344 { 1345 size_t fhsize; 1346 1347 if (fhp == NULL) { 1348 return; 1349 } 1350 fhsize = FHANDLE_SIZE(fhp); 1351 kmem_free(fhp, fhsize); 1352 } 1353 1354 /* 1355 * vfs_composefh: compose a filehandle. 1356 */ 1357 1358 int 1359 vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) 1360 { 1361 struct mount *mp; 1362 struct fid *fidp; 1363 int error; 1364 size_t needfhsize; 1365 size_t fidsize; 1366 1367 mp = vp->v_mount; 1368 fidp = NULL; 1369 if (*fh_size < FHANDLE_SIZE_MIN) { 1370 fidsize = 0; 1371 } else { 1372 fidsize = *fh_size - offsetof(fhandle_t, fh_fid); 1373 if (fhp != NULL) { 1374 memset(fhp, 0, *fh_size); 1375 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1376 fidp = &fhp->fh_fid; 1377 } 1378 } 1379 error = VFS_VPTOFH(vp, fidp, &fidsize); 1380 needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1381 if (error == 0 && *fh_size < needfhsize) { 1382 error = E2BIG; 1383 } 1384 *fh_size = needfhsize; 1385 return error; 1386 } 1387 1388 int 1389 vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) 1390 { 1391 struct mount *mp; 1392 fhandle_t *fhp; 1393 size_t fhsize; 1394 size_t fidsize; 1395 int error; 1396 1397 *fhpp = NULL; 1398 mp = vp->v_mount; 1399 fidsize = 0; 1400 error = VFS_VPTOFH(vp, NULL, &fidsize); 1401 KASSERT(error != 0); 1402 if (error != E2BIG) { 1403 goto out; 1404 } 1405 fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1406 fhp = kmem_zalloc(fhsize, KM_SLEEP); 1407 if (fhp == NULL) { 1408 error = ENOMEM; 1409 goto out; 1410 } 1411 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1412 error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); 1413 if (error == 0) { 1414 KASSERT((FHANDLE_SIZE(fhp) == fhsize && 1415 FHANDLE_FILEID(fhp)->fid_len == fidsize)); 1416 *fhpp = fhp; 1417 } else { 1418 kmem_free(fhp, fhsize); 1419 } 1420 out: 1421 return error; 1422 } 1423 1424 void 1425 vfs_composefh_free(fhandle_t *fhp) 1426 { 1427 1428 vfs__fhfree(fhp); 1429 } 1430 1431 /* 1432 * vfs_fhtovp: lookup a vnode by a filehandle. 1433 */ 1434 1435 int 1436 vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) 1437 { 1438 struct mount *mp; 1439 int error; 1440 1441 *vpp = NULL; 1442 mp = vfs_getvfs(FHANDLE_FSID(fhp)); 1443 if (mp == NULL) { 1444 error = ESTALE; 1445 goto out; 1446 } 1447 if (mp->mnt_op->vfs_fhtovp == NULL) { 1448 error = EOPNOTSUPP; 1449 goto out; 1450 } 1451 error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp); 1452 out: 1453 return error; 1454 } 1455 1456 /* 1457 * vfs_copyinfh_alloc: allocate and copyin a filehandle, given 1458 * the needed size. 1459 */ 1460 1461 int 1462 vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) 1463 { 1464 fhandle_t *fhp; 1465 int error; 1466 1467 *fhpp = NULL; 1468 if (fhsize > FHANDLE_SIZE_MAX) { 1469 return EINVAL; 1470 } 1471 if (fhsize < FHANDLE_SIZE_MIN) { 1472 return EINVAL; 1473 } 1474 again: 1475 fhp = kmem_alloc(fhsize, KM_SLEEP); 1476 if (fhp == NULL) { 1477 return ENOMEM; 1478 } 1479 error = copyin(ufhp, fhp, fhsize); 1480 if (error == 0) { 1481 /* XXX this check shouldn't be here */ 1482 if (FHANDLE_SIZE(fhp) == fhsize) { 1483 *fhpp = fhp; 1484 return 0; 1485 } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { 1486 /* 1487 * a kludge for nfsv2 padded handles. 1488 */ 1489 size_t sz; 1490 1491 sz = FHANDLE_SIZE(fhp); 1492 kmem_free(fhp, fhsize); 1493 fhsize = sz; 1494 goto again; 1495 } else { 1496 /* 1497 * userland told us wrong size. 1498 */ 1499 error = EINVAL; 1500 } 1501 } 1502 kmem_free(fhp, fhsize); 1503 return error; 1504 } 1505 1506 void 1507 vfs_copyinfh_free(fhandle_t *fhp) 1508 { 1509 1510 vfs__fhfree(fhp); 1511 } 1512 1513 /* 1514 * Get file handle system call 1515 */ 1516 int 1517 sys___getfh30(struct lwp *l, const struct sys___getfh30_args *uap, register_t *retval) 1518 { 1519 /* { 1520 syscallarg(char *) fname; 1521 syscallarg(fhandle_t *) fhp; 1522 syscallarg(size_t *) fh_size; 1523 } */ 1524 struct vnode *vp; 1525 fhandle_t *fh; 1526 int error; 1527 struct nameidata nd; 1528 size_t sz; 1529 size_t usz; 1530 1531 /* 1532 * Must be super user 1533 */ 1534 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1535 0, NULL, NULL, NULL); 1536 if (error) 1537 return (error); 1538 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 1539 SCARG(uap, fname)); 1540 error = namei(&nd); 1541 if (error) 1542 return (error); 1543 vp = nd.ni_vp; 1544 error = vfs_composefh_alloc(vp, &fh); 1545 vput(vp); 1546 if (error != 0) { 1547 goto out; 1548 } 1549 error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); 1550 if (error != 0) { 1551 goto out; 1552 } 1553 sz = FHANDLE_SIZE(fh); 1554 error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); 1555 if (error != 0) { 1556 goto out; 1557 } 1558 if (usz >= sz) { 1559 error = copyout(fh, SCARG(uap, fhp), sz); 1560 } else { 1561 error = E2BIG; 1562 } 1563 out: 1564 vfs_composefh_free(fh); 1565 return (error); 1566 } 1567 1568 /* 1569 * Open a file given a file handle. 1570 * 1571 * Check permissions, allocate an open file structure, 1572 * and call the device open routine if any. 1573 */ 1574 1575 int 1576 dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, 1577 register_t *retval) 1578 { 1579 file_t *fp; 1580 struct vnode *vp = NULL; 1581 kauth_cred_t cred = l->l_cred; 1582 file_t *nfp; 1583 int type, indx, error=0; 1584 struct flock lf; 1585 struct vattr va; 1586 fhandle_t *fh; 1587 int flags; 1588 proc_t *p; 1589 1590 p = curproc; 1591 1592 /* 1593 * Must be super user 1594 */ 1595 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1596 0, NULL, NULL, NULL))) 1597 return (error); 1598 1599 flags = FFLAGS(oflags); 1600 if ((flags & (FREAD | FWRITE)) == 0) 1601 return (EINVAL); 1602 if ((flags & O_CREAT)) 1603 return (EINVAL); 1604 if ((error = fd_allocfile(&nfp, &indx)) != 0) 1605 return (error); 1606 fp = nfp; 1607 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1608 if (error != 0) { 1609 goto bad; 1610 } 1611 error = vfs_fhtovp(fh, &vp); 1612 if (error != 0) { 1613 goto bad; 1614 } 1615 1616 /* Now do an effective vn_open */ 1617 1618 if (vp->v_type == VSOCK) { 1619 error = EOPNOTSUPP; 1620 goto bad; 1621 } 1622 error = vn_openchk(vp, cred, flags); 1623 if (error != 0) 1624 goto bad; 1625 if (flags & O_TRUNC) { 1626 VOP_UNLOCK(vp, 0); /* XXX */ 1627 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1628 VATTR_NULL(&va); 1629 va.va_size = 0; 1630 error = VOP_SETATTR(vp, &va, cred); 1631 if (error) 1632 goto bad; 1633 } 1634 if ((error = VOP_OPEN(vp, flags, cred)) != 0) 1635 goto bad; 1636 if (flags & FWRITE) { 1637 mutex_enter(&vp->v_interlock); 1638 vp->v_writecount++; 1639 mutex_exit(&vp->v_interlock); 1640 } 1641 1642 /* done with modified vn_open, now finish what sys_open does. */ 1643 1644 fp->f_flag = flags & FMASK; 1645 fp->f_type = DTYPE_VNODE; 1646 fp->f_ops = &vnops; 1647 fp->f_data = vp; 1648 if (flags & (O_EXLOCK | O_SHLOCK)) { 1649 lf.l_whence = SEEK_SET; 1650 lf.l_start = 0; 1651 lf.l_len = 0; 1652 if (flags & O_EXLOCK) 1653 lf.l_type = F_WRLCK; 1654 else 1655 lf.l_type = F_RDLCK; 1656 type = F_FLOCK; 1657 if ((flags & FNONBLOCK) == 0) 1658 type |= F_WAIT; 1659 VOP_UNLOCK(vp, 0); 1660 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1661 if (error) { 1662 (void) vn_close(vp, fp->f_flag, fp->f_cred); 1663 fd_abort(p, fp, indx); 1664 return (error); 1665 } 1666 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1667 atomic_or_uint(&fp->f_flag, FHASLOCK); 1668 } 1669 VOP_UNLOCK(vp, 0); 1670 *retval = indx; 1671 fd_affix(p, fp, indx); 1672 vfs_copyinfh_free(fh); 1673 return (0); 1674 1675 bad: 1676 fd_abort(p, fp, indx); 1677 if (vp != NULL) 1678 vput(vp); 1679 vfs_copyinfh_free(fh); 1680 return (error); 1681 } 1682 1683 int 1684 sys___fhopen40(struct lwp *l, const struct sys___fhopen40_args *uap, register_t *retval) 1685 { 1686 /* { 1687 syscallarg(const void *) fhp; 1688 syscallarg(size_t) fh_size; 1689 syscallarg(int) flags; 1690 } */ 1691 1692 return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), 1693 SCARG(uap, flags), retval); 1694 } 1695 1696 int 1697 do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb) 1698 { 1699 int error; 1700 fhandle_t *fh; 1701 struct vnode *vp; 1702 1703 /* 1704 * Must be super user 1705 */ 1706 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1707 0, NULL, NULL, NULL))) 1708 return (error); 1709 1710 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1711 if (error != 0) 1712 return error; 1713 1714 error = vfs_fhtovp(fh, &vp); 1715 vfs_copyinfh_free(fh); 1716 if (error != 0) 1717 return error; 1718 1719 error = vn_stat(vp, sb); 1720 vput(vp); 1721 return error; 1722 } 1723 1724 1725 /* ARGSUSED */ 1726 int 1727 sys___fhstat50(struct lwp *l, const struct sys___fhstat50_args *uap, register_t *retval) 1728 { 1729 /* { 1730 syscallarg(const void *) fhp; 1731 syscallarg(size_t) fh_size; 1732 syscallarg(struct stat *) sb; 1733 } */ 1734 struct stat sb; 1735 int error; 1736 1737 error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb); 1738 if (error) 1739 return error; 1740 return copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1741 } 1742 1743 int 1744 do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb, 1745 int flags) 1746 { 1747 fhandle_t *fh; 1748 struct mount *mp; 1749 struct vnode *vp; 1750 int error; 1751 1752 /* 1753 * Must be super user 1754 */ 1755 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1756 0, NULL, NULL, NULL))) 1757 return error; 1758 1759 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1760 if (error != 0) 1761 return error; 1762 1763 error = vfs_fhtovp(fh, &vp); 1764 vfs_copyinfh_free(fh); 1765 if (error != 0) 1766 return error; 1767 1768 mp = vp->v_mount; 1769 error = dostatvfs(mp, sb, l, flags, 1); 1770 vput(vp); 1771 return error; 1772 } 1773 1774 /* ARGSUSED */ 1775 int 1776 sys___fhstatvfs140(struct lwp *l, const struct sys___fhstatvfs140_args *uap, register_t *retval) 1777 { 1778 /* { 1779 syscallarg(const void *) fhp; 1780 syscallarg(size_t) fh_size; 1781 syscallarg(struct statvfs *) buf; 1782 syscallarg(int) flags; 1783 } */ 1784 struct statvfs *sb = STATVFSBUF_GET(); 1785 int error; 1786 1787 error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb, 1788 SCARG(uap, flags)); 1789 if (error == 0) 1790 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1791 STATVFSBUF_PUT(sb); 1792 return error; 1793 } 1794 1795 /* 1796 * Create a special file. 1797 */ 1798 /* ARGSUSED */ 1799 int 1800 sys___mknod50(struct lwp *l, const struct sys___mknod50_args *uap, 1801 register_t *retval) 1802 { 1803 /* { 1804 syscallarg(const char *) path; 1805 syscallarg(mode_t) mode; 1806 syscallarg(dev_t) dev; 1807 } */ 1808 return do_sys_mknod(l, SCARG(uap, path), SCARG(uap, mode), 1809 SCARG(uap, dev), retval, UIO_USERSPACE); 1810 } 1811 1812 int 1813 do_sys_mknod(struct lwp *l, const char *pathname, mode_t mode, dev_t dev, 1814 register_t *retval, enum uio_seg seg) 1815 { 1816 struct proc *p = l->l_proc; 1817 struct vnode *vp; 1818 struct vattr vattr; 1819 int error, optype; 1820 struct nameidata nd; 1821 char *path; 1822 const char *cpath; 1823 1824 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 1825 0, NULL, NULL, NULL)) != 0) 1826 return (error); 1827 1828 optype = VOP_MKNOD_DESCOFFSET; 1829 1830 VERIEXEC_PATH_GET(pathname, seg, cpath, path); 1831 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, seg, cpath); 1832 1833 if ((error = namei(&nd)) != 0) 1834 goto out; 1835 vp = nd.ni_vp; 1836 if (vp != NULL) 1837 error = EEXIST; 1838 else { 1839 VATTR_NULL(&vattr); 1840 /* We will read cwdi->cwdi_cmask unlocked. */ 1841 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1842 vattr.va_rdev = dev; 1843 1844 switch (mode & S_IFMT) { 1845 case S_IFMT: /* used by badsect to flag bad sectors */ 1846 vattr.va_type = VBAD; 1847 break; 1848 case S_IFCHR: 1849 vattr.va_type = VCHR; 1850 break; 1851 case S_IFBLK: 1852 vattr.va_type = VBLK; 1853 break; 1854 case S_IFWHT: 1855 optype = VOP_WHITEOUT_DESCOFFSET; 1856 break; 1857 case S_IFREG: 1858 #if NVERIEXEC > 0 1859 error = veriexec_openchk(l, nd.ni_vp, nd.ni_dirp, 1860 O_CREAT); 1861 #endif /* NVERIEXEC > 0 */ 1862 vattr.va_type = VREG; 1863 vattr.va_rdev = VNOVAL; 1864 optype = VOP_CREATE_DESCOFFSET; 1865 break; 1866 default: 1867 error = EINVAL; 1868 break; 1869 } 1870 } 1871 if (!error) { 1872 switch (optype) { 1873 case VOP_WHITEOUT_DESCOFFSET: 1874 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1875 if (error) 1876 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1877 vput(nd.ni_dvp); 1878 break; 1879 1880 case VOP_MKNOD_DESCOFFSET: 1881 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1882 &nd.ni_cnd, &vattr); 1883 if (error == 0) 1884 vput(nd.ni_vp); 1885 break; 1886 1887 case VOP_CREATE_DESCOFFSET: 1888 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, 1889 &nd.ni_cnd, &vattr); 1890 if (error == 0) 1891 vput(nd.ni_vp); 1892 break; 1893 } 1894 } else { 1895 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1896 if (nd.ni_dvp == vp) 1897 vrele(nd.ni_dvp); 1898 else 1899 vput(nd.ni_dvp); 1900 if (vp) 1901 vrele(vp); 1902 } 1903 out: 1904 VERIEXEC_PATH_PUT(path); 1905 return (error); 1906 } 1907 1908 /* 1909 * Create a named pipe. 1910 */ 1911 /* ARGSUSED */ 1912 int 1913 sys_mkfifo(struct lwp *l, const struct sys_mkfifo_args *uap, register_t *retval) 1914 { 1915 /* { 1916 syscallarg(const char *) path; 1917 syscallarg(int) mode; 1918 } */ 1919 struct proc *p = l->l_proc; 1920 struct vattr vattr; 1921 int error; 1922 struct nameidata nd; 1923 1924 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, 1925 SCARG(uap, path)); 1926 if ((error = namei(&nd)) != 0) 1927 return (error); 1928 if (nd.ni_vp != NULL) { 1929 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1930 if (nd.ni_dvp == nd.ni_vp) 1931 vrele(nd.ni_dvp); 1932 else 1933 vput(nd.ni_dvp); 1934 vrele(nd.ni_vp); 1935 return (EEXIST); 1936 } 1937 VATTR_NULL(&vattr); 1938 vattr.va_type = VFIFO; 1939 /* We will read cwdi->cwdi_cmask unlocked. */ 1940 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1941 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1942 if (error == 0) 1943 vput(nd.ni_vp); 1944 return (error); 1945 } 1946 1947 /* 1948 * Make a hard file link. 1949 */ 1950 /* ARGSUSED */ 1951 int 1952 sys_link(struct lwp *l, const struct sys_link_args *uap, register_t *retval) 1953 { 1954 /* { 1955 syscallarg(const char *) path; 1956 syscallarg(const char *) link; 1957 } */ 1958 struct vnode *vp; 1959 struct nameidata nd; 1960 int error; 1961 1962 error = namei_simple_user(SCARG(uap, path), 1963 NSM_FOLLOW_TRYEMULROOT, &vp); 1964 if (error != 0) 1965 return (error); 1966 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, 1967 SCARG(uap, link)); 1968 if ((error = namei(&nd)) != 0) 1969 goto out; 1970 if (nd.ni_vp) { 1971 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1972 if (nd.ni_dvp == nd.ni_vp) 1973 vrele(nd.ni_dvp); 1974 else 1975 vput(nd.ni_dvp); 1976 vrele(nd.ni_vp); 1977 error = EEXIST; 1978 goto out; 1979 } 1980 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1981 out: 1982 vrele(vp); 1983 return (error); 1984 } 1985 1986 /* 1987 * Make a symbolic link. 1988 */ 1989 /* ARGSUSED */ 1990 int 1991 sys_symlink(struct lwp *l, const struct sys_symlink_args *uap, register_t *retval) 1992 { 1993 /* { 1994 syscallarg(const char *) path; 1995 syscallarg(const char *) link; 1996 } */ 1997 struct proc *p = l->l_proc; 1998 struct vattr vattr; 1999 char *path; 2000 int error; 2001 struct nameidata nd; 2002 2003 path = PNBUF_GET(); 2004 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 2005 if (error) 2006 goto out; 2007 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, 2008 SCARG(uap, link)); 2009 if ((error = namei(&nd)) != 0) 2010 goto out; 2011 if (nd.ni_vp) { 2012 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2013 if (nd.ni_dvp == nd.ni_vp) 2014 vrele(nd.ni_dvp); 2015 else 2016 vput(nd.ni_dvp); 2017 vrele(nd.ni_vp); 2018 error = EEXIST; 2019 goto out; 2020 } 2021 VATTR_NULL(&vattr); 2022 vattr.va_type = VLNK; 2023 /* We will read cwdi->cwdi_cmask unlocked. */ 2024 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 2025 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 2026 if (error == 0) 2027 vput(nd.ni_vp); 2028 out: 2029 PNBUF_PUT(path); 2030 return (error); 2031 } 2032 2033 /* 2034 * Delete a whiteout from the filesystem. 2035 */ 2036 /* ARGSUSED */ 2037 int 2038 sys_undelete(struct lwp *l, const struct sys_undelete_args *uap, register_t *retval) 2039 { 2040 /* { 2041 syscallarg(const char *) path; 2042 } */ 2043 int error; 2044 struct nameidata nd; 2045 2046 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT, 2047 UIO_USERSPACE, SCARG(uap, path)); 2048 error = namei(&nd); 2049 if (error) 2050 return (error); 2051 2052 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 2053 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2054 if (nd.ni_dvp == nd.ni_vp) 2055 vrele(nd.ni_dvp); 2056 else 2057 vput(nd.ni_dvp); 2058 if (nd.ni_vp) 2059 vrele(nd.ni_vp); 2060 return (EEXIST); 2061 } 2062 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 2063 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2064 vput(nd.ni_dvp); 2065 return (error); 2066 } 2067 2068 /* 2069 * Delete a name from the filesystem. 2070 */ 2071 /* ARGSUSED */ 2072 int 2073 sys_unlink(struct lwp *l, const struct sys_unlink_args *uap, register_t *retval) 2074 { 2075 /* { 2076 syscallarg(const char *) path; 2077 } */ 2078 2079 return do_sys_unlink(SCARG(uap, path), UIO_USERSPACE); 2080 } 2081 2082 int 2083 do_sys_unlink(const char *arg, enum uio_seg seg) 2084 { 2085 struct vnode *vp; 2086 int error; 2087 struct nameidata nd; 2088 char *path; 2089 const char *cpath; 2090 2091 VERIEXEC_PATH_GET(arg, seg, cpath, path); 2092 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, seg, cpath); 2093 2094 if ((error = namei(&nd)) != 0) 2095 goto out; 2096 vp = nd.ni_vp; 2097 2098 /* 2099 * The root of a mounted filesystem cannot be deleted. 2100 */ 2101 if (vp->v_vflag & VV_ROOT) { 2102 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2103 if (nd.ni_dvp == vp) 2104 vrele(nd.ni_dvp); 2105 else 2106 vput(nd.ni_dvp); 2107 vput(vp); 2108 error = EBUSY; 2109 goto out; 2110 } 2111 2112 #if NVERIEXEC > 0 2113 /* Handle remove requests for veriexec entries. */ 2114 if ((error = veriexec_removechk(curlwp, nd.ni_vp, nd.ni_dirp)) != 0) { 2115 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2116 if (nd.ni_dvp == vp) 2117 vrele(nd.ni_dvp); 2118 else 2119 vput(nd.ni_dvp); 2120 vput(vp); 2121 goto out; 2122 } 2123 #endif /* NVERIEXEC > 0 */ 2124 2125 #ifdef FILEASSOC 2126 (void)fileassoc_file_delete(vp); 2127 #endif /* FILEASSOC */ 2128 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2129 out: 2130 VERIEXEC_PATH_PUT(path); 2131 return (error); 2132 } 2133 2134 /* 2135 * Reposition read/write file offset. 2136 */ 2137 int 2138 sys_lseek(struct lwp *l, const struct sys_lseek_args *uap, register_t *retval) 2139 { 2140 /* { 2141 syscallarg(int) fd; 2142 syscallarg(int) pad; 2143 syscallarg(off_t) offset; 2144 syscallarg(int) whence; 2145 } */ 2146 kauth_cred_t cred = l->l_cred; 2147 file_t *fp; 2148 struct vnode *vp; 2149 struct vattr vattr; 2150 off_t newoff; 2151 int error, fd; 2152 2153 fd = SCARG(uap, fd); 2154 2155 if ((fp = fd_getfile(fd)) == NULL) 2156 return (EBADF); 2157 2158 vp = fp->f_data; 2159 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2160 error = ESPIPE; 2161 goto out; 2162 } 2163 2164 switch (SCARG(uap, whence)) { 2165 case SEEK_CUR: 2166 newoff = fp->f_offset + SCARG(uap, offset); 2167 break; 2168 case SEEK_END: 2169 vn_lock(vp, LK_SHARED | LK_RETRY); 2170 error = VOP_GETATTR(vp, &vattr, cred); 2171 VOP_UNLOCK(vp, 0); 2172 if (error) { 2173 goto out; 2174 } 2175 newoff = SCARG(uap, offset) + vattr.va_size; 2176 break; 2177 case SEEK_SET: 2178 newoff = SCARG(uap, offset); 2179 break; 2180 default: 2181 error = EINVAL; 2182 goto out; 2183 } 2184 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) == 0) { 2185 *(off_t *)retval = fp->f_offset = newoff; 2186 } 2187 out: 2188 fd_putfile(fd); 2189 return (error); 2190 } 2191 2192 /* 2193 * Positional read system call. 2194 */ 2195 int 2196 sys_pread(struct lwp *l, const struct sys_pread_args *uap, register_t *retval) 2197 { 2198 /* { 2199 syscallarg(int) fd; 2200 syscallarg(void *) buf; 2201 syscallarg(size_t) nbyte; 2202 syscallarg(off_t) offset; 2203 } */ 2204 file_t *fp; 2205 struct vnode *vp; 2206 off_t offset; 2207 int error, fd = SCARG(uap, fd); 2208 2209 if ((fp = fd_getfile(fd)) == NULL) 2210 return (EBADF); 2211 2212 if ((fp->f_flag & FREAD) == 0) { 2213 fd_putfile(fd); 2214 return (EBADF); 2215 } 2216 2217 vp = fp->f_data; 2218 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2219 error = ESPIPE; 2220 goto out; 2221 } 2222 2223 offset = SCARG(uap, offset); 2224 2225 /* 2226 * XXX This works because no file systems actually 2227 * XXX take any action on the seek operation. 2228 */ 2229 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2230 goto out; 2231 2232 /* dofileread() will unuse the descriptor for us */ 2233 return (dofileread(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2234 &offset, 0, retval)); 2235 2236 out: 2237 fd_putfile(fd); 2238 return (error); 2239 } 2240 2241 /* 2242 * Positional scatter read system call. 2243 */ 2244 int 2245 sys_preadv(struct lwp *l, const struct sys_preadv_args *uap, register_t *retval) 2246 { 2247 /* { 2248 syscallarg(int) fd; 2249 syscallarg(const struct iovec *) iovp; 2250 syscallarg(int) iovcnt; 2251 syscallarg(off_t) offset; 2252 } */ 2253 off_t offset = SCARG(uap, offset); 2254 2255 return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp), 2256 SCARG(uap, iovcnt), &offset, 0, retval); 2257 } 2258 2259 /* 2260 * Positional write system call. 2261 */ 2262 int 2263 sys_pwrite(struct lwp *l, const struct sys_pwrite_args *uap, register_t *retval) 2264 { 2265 /* { 2266 syscallarg(int) fd; 2267 syscallarg(const void *) buf; 2268 syscallarg(size_t) nbyte; 2269 syscallarg(off_t) offset; 2270 } */ 2271 file_t *fp; 2272 struct vnode *vp; 2273 off_t offset; 2274 int error, fd = SCARG(uap, fd); 2275 2276 if ((fp = fd_getfile(fd)) == NULL) 2277 return (EBADF); 2278 2279 if ((fp->f_flag & FWRITE) == 0) { 2280 fd_putfile(fd); 2281 return (EBADF); 2282 } 2283 2284 vp = fp->f_data; 2285 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2286 error = ESPIPE; 2287 goto out; 2288 } 2289 2290 offset = SCARG(uap, offset); 2291 2292 /* 2293 * XXX This works because no file systems actually 2294 * XXX take any action on the seek operation. 2295 */ 2296 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2297 goto out; 2298 2299 /* dofilewrite() will unuse the descriptor for us */ 2300 return (dofilewrite(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2301 &offset, 0, retval)); 2302 2303 out: 2304 fd_putfile(fd); 2305 return (error); 2306 } 2307 2308 /* 2309 * Positional gather write system call. 2310 */ 2311 int 2312 sys_pwritev(struct lwp *l, const struct sys_pwritev_args *uap, register_t *retval) 2313 { 2314 /* { 2315 syscallarg(int) fd; 2316 syscallarg(const struct iovec *) iovp; 2317 syscallarg(int) iovcnt; 2318 syscallarg(off_t) offset; 2319 } */ 2320 off_t offset = SCARG(uap, offset); 2321 2322 return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp), 2323 SCARG(uap, iovcnt), &offset, 0, retval); 2324 } 2325 2326 /* 2327 * Check access permissions. 2328 */ 2329 int 2330 sys_access(struct lwp *l, const struct sys_access_args *uap, register_t *retval) 2331 { 2332 /* { 2333 syscallarg(const char *) path; 2334 syscallarg(int) flags; 2335 } */ 2336 kauth_cred_t cred; 2337 struct vnode *vp; 2338 int error, flags; 2339 struct nameidata nd; 2340 2341 cred = kauth_cred_dup(l->l_cred); 2342 kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); 2343 kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); 2344 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 2345 SCARG(uap, path)); 2346 /* Override default credentials */ 2347 nd.ni_cnd.cn_cred = cred; 2348 if ((error = namei(&nd)) != 0) 2349 goto out; 2350 vp = nd.ni_vp; 2351 2352 /* Flags == 0 means only check for existence. */ 2353 if (SCARG(uap, flags)) { 2354 flags = 0; 2355 if (SCARG(uap, flags) & R_OK) 2356 flags |= VREAD; 2357 if (SCARG(uap, flags) & W_OK) 2358 flags |= VWRITE; 2359 if (SCARG(uap, flags) & X_OK) 2360 flags |= VEXEC; 2361 2362 error = VOP_ACCESS(vp, flags, cred); 2363 if (!error && (flags & VWRITE)) 2364 error = vn_writechk(vp); 2365 } 2366 vput(vp); 2367 out: 2368 kauth_cred_free(cred); 2369 return (error); 2370 } 2371 2372 /* 2373 * Common code for all sys_stat functions, including compat versions. 2374 */ 2375 int 2376 do_sys_stat(const char *path, unsigned int nd_flags, struct stat *sb) 2377 { 2378 int error; 2379 struct nameidata nd; 2380 2381 NDINIT(&nd, LOOKUP, nd_flags | LOCKLEAF | TRYEMULROOT, 2382 UIO_USERSPACE, path); 2383 error = namei(&nd); 2384 if (error != 0) 2385 return error; 2386 error = vn_stat(nd.ni_vp, sb); 2387 vput(nd.ni_vp); 2388 return error; 2389 } 2390 2391 /* 2392 * Get file status; this version follows links. 2393 */ 2394 /* ARGSUSED */ 2395 int 2396 sys___stat50(struct lwp *l, const struct sys___stat50_args *uap, register_t *retval) 2397 { 2398 /* { 2399 syscallarg(const char *) path; 2400 syscallarg(struct stat *) ub; 2401 } */ 2402 struct stat sb; 2403 int error; 2404 2405 error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); 2406 if (error) 2407 return error; 2408 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2409 } 2410 2411 /* 2412 * Get file status; this version does not follow links. 2413 */ 2414 /* ARGSUSED */ 2415 int 2416 sys___lstat50(struct lwp *l, const struct sys___lstat50_args *uap, register_t *retval) 2417 { 2418 /* { 2419 syscallarg(const char *) path; 2420 syscallarg(struct stat *) ub; 2421 } */ 2422 struct stat sb; 2423 int error; 2424 2425 error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb); 2426 if (error) 2427 return error; 2428 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2429 } 2430 2431 /* 2432 * Get configurable pathname variables. 2433 */ 2434 /* ARGSUSED */ 2435 int 2436 sys_pathconf(struct lwp *l, const struct sys_pathconf_args *uap, register_t *retval) 2437 { 2438 /* { 2439 syscallarg(const char *) path; 2440 syscallarg(int) name; 2441 } */ 2442 int error; 2443 struct nameidata nd; 2444 2445 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 2446 SCARG(uap, path)); 2447 if ((error = namei(&nd)) != 0) 2448 return (error); 2449 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2450 vput(nd.ni_vp); 2451 return (error); 2452 } 2453 2454 /* 2455 * Return target name of a symbolic link. 2456 */ 2457 /* ARGSUSED */ 2458 int 2459 sys_readlink(struct lwp *l, const struct sys_readlink_args *uap, register_t *retval) 2460 { 2461 /* { 2462 syscallarg(const char *) path; 2463 syscallarg(char *) buf; 2464 syscallarg(size_t) count; 2465 } */ 2466 struct vnode *vp; 2467 struct iovec aiov; 2468 struct uio auio; 2469 int error; 2470 struct nameidata nd; 2471 2472 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 2473 SCARG(uap, path)); 2474 if ((error = namei(&nd)) != 0) 2475 return (error); 2476 vp = nd.ni_vp; 2477 if (vp->v_type != VLNK) 2478 error = EINVAL; 2479 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2480 (error = VOP_ACCESS(vp, VREAD, l->l_cred)) == 0) { 2481 aiov.iov_base = SCARG(uap, buf); 2482 aiov.iov_len = SCARG(uap, count); 2483 auio.uio_iov = &aiov; 2484 auio.uio_iovcnt = 1; 2485 auio.uio_offset = 0; 2486 auio.uio_rw = UIO_READ; 2487 KASSERT(l == curlwp); 2488 auio.uio_vmspace = l->l_proc->p_vmspace; 2489 auio.uio_resid = SCARG(uap, count); 2490 error = VOP_READLINK(vp, &auio, l->l_cred); 2491 } 2492 vput(vp); 2493 *retval = SCARG(uap, count) - auio.uio_resid; 2494 return (error); 2495 } 2496 2497 /* 2498 * Change flags of a file given a path name. 2499 */ 2500 /* ARGSUSED */ 2501 int 2502 sys_chflags(struct lwp *l, const struct sys_chflags_args *uap, register_t *retval) 2503 { 2504 /* { 2505 syscallarg(const char *) path; 2506 syscallarg(u_long) flags; 2507 } */ 2508 struct vnode *vp; 2509 int error; 2510 2511 error = namei_simple_user(SCARG(uap, path), 2512 NSM_FOLLOW_TRYEMULROOT, &vp); 2513 if (error != 0) 2514 return (error); 2515 error = change_flags(vp, SCARG(uap, flags), l); 2516 vput(vp); 2517 return (error); 2518 } 2519 2520 /* 2521 * Change flags of a file given a file descriptor. 2522 */ 2523 /* ARGSUSED */ 2524 int 2525 sys_fchflags(struct lwp *l, const struct sys_fchflags_args *uap, register_t *retval) 2526 { 2527 /* { 2528 syscallarg(int) fd; 2529 syscallarg(u_long) flags; 2530 } */ 2531 struct vnode *vp; 2532 file_t *fp; 2533 int error; 2534 2535 /* fd_getvnode() will use the descriptor for us */ 2536 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 2537 return (error); 2538 vp = fp->f_data; 2539 error = change_flags(vp, SCARG(uap, flags), l); 2540 VOP_UNLOCK(vp, 0); 2541 fd_putfile(SCARG(uap, fd)); 2542 return (error); 2543 } 2544 2545 /* 2546 * Change flags of a file given a path name; this version does 2547 * not follow links. 2548 */ 2549 int 2550 sys_lchflags(struct lwp *l, const struct sys_lchflags_args *uap, register_t *retval) 2551 { 2552 /* { 2553 syscallarg(const char *) path; 2554 syscallarg(u_long) flags; 2555 } */ 2556 struct vnode *vp; 2557 int error; 2558 2559 error = namei_simple_user(SCARG(uap, path), 2560 NSM_NOFOLLOW_TRYEMULROOT, &vp); 2561 if (error != 0) 2562 return (error); 2563 error = change_flags(vp, SCARG(uap, flags), l); 2564 vput(vp); 2565 return (error); 2566 } 2567 2568 /* 2569 * Common routine to change flags of a file. 2570 */ 2571 int 2572 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 2573 { 2574 struct vattr vattr; 2575 int error; 2576 2577 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2578 /* 2579 * Non-superusers cannot change the flags on devices, even if they 2580 * own them. 2581 */ 2582 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) { 2583 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) 2584 goto out; 2585 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2586 error = EINVAL; 2587 goto out; 2588 } 2589 } 2590 VATTR_NULL(&vattr); 2591 vattr.va_flags = flags; 2592 error = VOP_SETATTR(vp, &vattr, l->l_cred); 2593 out: 2594 return (error); 2595 } 2596 2597 /* 2598 * Change mode of a file given path name; this version follows links. 2599 */ 2600 /* ARGSUSED */ 2601 int 2602 sys_chmod(struct lwp *l, const struct sys_chmod_args *uap, register_t *retval) 2603 { 2604 /* { 2605 syscallarg(const char *) path; 2606 syscallarg(int) mode; 2607 } */ 2608 int error; 2609 struct vnode *vp; 2610 2611 error = namei_simple_user(SCARG(uap, path), 2612 NSM_FOLLOW_TRYEMULROOT, &vp); 2613 if (error != 0) 2614 return (error); 2615 2616 error = change_mode(vp, SCARG(uap, mode), l); 2617 2618 vrele(vp); 2619 return (error); 2620 } 2621 2622 /* 2623 * Change mode of a file given a file descriptor. 2624 */ 2625 /* ARGSUSED */ 2626 int 2627 sys_fchmod(struct lwp *l, const struct sys_fchmod_args *uap, register_t *retval) 2628 { 2629 /* { 2630 syscallarg(int) fd; 2631 syscallarg(int) mode; 2632 } */ 2633 file_t *fp; 2634 int error; 2635 2636 /* fd_getvnode() will use the descriptor for us */ 2637 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 2638 return (error); 2639 error = change_mode(fp->f_data, SCARG(uap, mode), l); 2640 fd_putfile(SCARG(uap, fd)); 2641 return (error); 2642 } 2643 2644 /* 2645 * Change mode of a file given path name; this version does not follow links. 2646 */ 2647 /* ARGSUSED */ 2648 int 2649 sys_lchmod(struct lwp *l, const struct sys_lchmod_args *uap, register_t *retval) 2650 { 2651 /* { 2652 syscallarg(const char *) path; 2653 syscallarg(int) mode; 2654 } */ 2655 int error; 2656 struct vnode *vp; 2657 2658 error = namei_simple_user(SCARG(uap, path), 2659 NSM_NOFOLLOW_TRYEMULROOT, &vp); 2660 if (error != 0) 2661 return (error); 2662 2663 error = change_mode(vp, SCARG(uap, mode), l); 2664 2665 vrele(vp); 2666 return (error); 2667 } 2668 2669 /* 2670 * Common routine to set mode given a vnode. 2671 */ 2672 static int 2673 change_mode(struct vnode *vp, int mode, struct lwp *l) 2674 { 2675 struct vattr vattr; 2676 int error; 2677 2678 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2679 VATTR_NULL(&vattr); 2680 vattr.va_mode = mode & ALLPERMS; 2681 error = VOP_SETATTR(vp, &vattr, l->l_cred); 2682 VOP_UNLOCK(vp, 0); 2683 return (error); 2684 } 2685 2686 /* 2687 * Set ownership given a path name; this version follows links. 2688 */ 2689 /* ARGSUSED */ 2690 int 2691 sys_chown(struct lwp *l, const struct sys_chown_args *uap, register_t *retval) 2692 { 2693 /* { 2694 syscallarg(const char *) path; 2695 syscallarg(uid_t) uid; 2696 syscallarg(gid_t) gid; 2697 } */ 2698 int error; 2699 struct vnode *vp; 2700 2701 error = namei_simple_user(SCARG(uap, path), 2702 NSM_FOLLOW_TRYEMULROOT, &vp); 2703 if (error != 0) 2704 return (error); 2705 2706 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 2707 2708 vrele(vp); 2709 return (error); 2710 } 2711 2712 /* 2713 * Set ownership given a path name; this version follows links. 2714 * Provides POSIX semantics. 2715 */ 2716 /* ARGSUSED */ 2717 int 2718 sys___posix_chown(struct lwp *l, const struct sys___posix_chown_args *uap, register_t *retval) 2719 { 2720 /* { 2721 syscallarg(const char *) path; 2722 syscallarg(uid_t) uid; 2723 syscallarg(gid_t) gid; 2724 } */ 2725 int error; 2726 struct vnode *vp; 2727 2728 error = namei_simple_user(SCARG(uap, path), 2729 NSM_FOLLOW_TRYEMULROOT, &vp); 2730 if (error != 0) 2731 return (error); 2732 2733 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 2734 2735 vrele(vp); 2736 return (error); 2737 } 2738 2739 /* 2740 * Set ownership given a file descriptor. 2741 */ 2742 /* ARGSUSED */ 2743 int 2744 sys_fchown(struct lwp *l, const struct sys_fchown_args *uap, register_t *retval) 2745 { 2746 /* { 2747 syscallarg(int) fd; 2748 syscallarg(uid_t) uid; 2749 syscallarg(gid_t) gid; 2750 } */ 2751 int error; 2752 file_t *fp; 2753 2754 /* fd_getvnode() will use the descriptor for us */ 2755 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 2756 return (error); 2757 error = change_owner(fp->f_data, SCARG(uap, uid), SCARG(uap, gid), 2758 l, 0); 2759 fd_putfile(SCARG(uap, fd)); 2760 return (error); 2761 } 2762 2763 /* 2764 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2765 */ 2766 /* ARGSUSED */ 2767 int 2768 sys___posix_fchown(struct lwp *l, const struct sys___posix_fchown_args *uap, register_t *retval) 2769 { 2770 /* { 2771 syscallarg(int) fd; 2772 syscallarg(uid_t) uid; 2773 syscallarg(gid_t) gid; 2774 } */ 2775 int error; 2776 file_t *fp; 2777 2778 /* fd_getvnode() will use the descriptor for us */ 2779 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 2780 return (error); 2781 error = change_owner(fp->f_data, SCARG(uap, uid), SCARG(uap, gid), 2782 l, 1); 2783 fd_putfile(SCARG(uap, fd)); 2784 return (error); 2785 } 2786 2787 /* 2788 * Set ownership given a path name; this version does not follow links. 2789 */ 2790 /* ARGSUSED */ 2791 int 2792 sys_lchown(struct lwp *l, const struct sys_lchown_args *uap, register_t *retval) 2793 { 2794 /* { 2795 syscallarg(const char *) path; 2796 syscallarg(uid_t) uid; 2797 syscallarg(gid_t) gid; 2798 } */ 2799 int error; 2800 struct vnode *vp; 2801 2802 error = namei_simple_user(SCARG(uap, path), 2803 NSM_NOFOLLOW_TRYEMULROOT, &vp); 2804 if (error != 0) 2805 return (error); 2806 2807 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 2808 2809 vrele(vp); 2810 return (error); 2811 } 2812 2813 /* 2814 * Set ownership given a path name; this version does not follow links. 2815 * Provides POSIX/XPG semantics. 2816 */ 2817 /* ARGSUSED */ 2818 int 2819 sys___posix_lchown(struct lwp *l, const struct sys___posix_lchown_args *uap, register_t *retval) 2820 { 2821 /* { 2822 syscallarg(const char *) path; 2823 syscallarg(uid_t) uid; 2824 syscallarg(gid_t) gid; 2825 } */ 2826 int error; 2827 struct vnode *vp; 2828 2829 error = namei_simple_user(SCARG(uap, path), 2830 NSM_NOFOLLOW_TRYEMULROOT, &vp); 2831 if (error != 0) 2832 return (error); 2833 2834 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 2835 2836 vrele(vp); 2837 return (error); 2838 } 2839 2840 /* 2841 * Common routine to set ownership given a vnode. 2842 */ 2843 static int 2844 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 2845 int posix_semantics) 2846 { 2847 struct vattr vattr; 2848 mode_t newmode; 2849 int error; 2850 2851 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2852 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) 2853 goto out; 2854 2855 #define CHANGED(x) ((int)(x) != -1) 2856 newmode = vattr.va_mode; 2857 if (posix_semantics) { 2858 /* 2859 * POSIX/XPG semantics: if the caller is not the super-user, 2860 * clear set-user-id and set-group-id bits. Both POSIX and 2861 * the XPG consider the behaviour for calls by the super-user 2862 * implementation-defined; we leave the set-user-id and set- 2863 * group-id settings intact in that case. 2864 */ 2865 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 2866 NULL) != 0) 2867 newmode &= ~(S_ISUID | S_ISGID); 2868 } else { 2869 /* 2870 * NetBSD semantics: when changing owner and/or group, 2871 * clear the respective bit(s). 2872 */ 2873 if (CHANGED(uid)) 2874 newmode &= ~S_ISUID; 2875 if (CHANGED(gid)) 2876 newmode &= ~S_ISGID; 2877 } 2878 /* Update va_mode iff altered. */ 2879 if (vattr.va_mode == newmode) 2880 newmode = VNOVAL; 2881 2882 VATTR_NULL(&vattr); 2883 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2884 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2885 vattr.va_mode = newmode; 2886 error = VOP_SETATTR(vp, &vattr, l->l_cred); 2887 #undef CHANGED 2888 2889 out: 2890 VOP_UNLOCK(vp, 0); 2891 return (error); 2892 } 2893 2894 /* 2895 * Set the access and modification times given a path name; this 2896 * version follows links. 2897 */ 2898 /* ARGSUSED */ 2899 int 2900 sys___utimes50(struct lwp *l, const struct sys___utimes50_args *uap, 2901 register_t *retval) 2902 { 2903 /* { 2904 syscallarg(const char *) path; 2905 syscallarg(const struct timeval *) tptr; 2906 } */ 2907 2908 return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, 2909 SCARG(uap, tptr), UIO_USERSPACE); 2910 } 2911 2912 /* 2913 * Set the access and modification times given a file descriptor. 2914 */ 2915 /* ARGSUSED */ 2916 int 2917 sys___futimes50(struct lwp *l, const struct sys___futimes50_args *uap, 2918 register_t *retval) 2919 { 2920 /* { 2921 syscallarg(int) fd; 2922 syscallarg(const struct timeval *) tptr; 2923 } */ 2924 int error; 2925 file_t *fp; 2926 2927 /* fd_getvnode() will use the descriptor for us */ 2928 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 2929 return (error); 2930 error = do_sys_utimes(l, fp->f_data, NULL, 0, SCARG(uap, tptr), 2931 UIO_USERSPACE); 2932 fd_putfile(SCARG(uap, fd)); 2933 return (error); 2934 } 2935 2936 /* 2937 * Set the access and modification times given a path name; this 2938 * version does not follow links. 2939 */ 2940 int 2941 sys___lutimes50(struct lwp *l, const struct sys___lutimes50_args *uap, 2942 register_t *retval) 2943 { 2944 /* { 2945 syscallarg(const char *) path; 2946 syscallarg(const struct timeval *) tptr; 2947 } */ 2948 2949 return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW, 2950 SCARG(uap, tptr), UIO_USERSPACE); 2951 } 2952 2953 /* 2954 * Common routine to set access and modification times given a vnode. 2955 */ 2956 int 2957 do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag, 2958 const struct timeval *tptr, enum uio_seg seg) 2959 { 2960 struct vattr vattr; 2961 int error, dorele = 0; 2962 namei_simple_flags_t sflags; 2963 2964 bool vanull, setbirthtime; 2965 struct timespec ts[2]; 2966 2967 /* 2968 * I have checked all callers and they pass either FOLLOW, 2969 * NOFOLLOW, or 0 (when they don't pass a path), and NOFOLLOW 2970 * is 0. More to the point, they don't pass anything else. 2971 * Let's keep it that way at least until the namei interfaces 2972 * are fully sanitized. 2973 */ 2974 KASSERT(flag == NOFOLLOW || flag == FOLLOW); 2975 sflags = (flag == FOLLOW) ? 2976 NSM_FOLLOW_TRYEMULROOT : NSM_NOFOLLOW_TRYEMULROOT; 2977 2978 if (tptr == NULL) { 2979 vanull = true; 2980 nanotime(&ts[0]); 2981 ts[1] = ts[0]; 2982 } else { 2983 struct timeval tv[2]; 2984 2985 vanull = false; 2986 if (seg != UIO_SYSSPACE) { 2987 error = copyin(tptr, tv, sizeof (tv)); 2988 if (error != 0) 2989 return error; 2990 tptr = tv; 2991 } 2992 TIMEVAL_TO_TIMESPEC(&tptr[0], &ts[0]); 2993 TIMEVAL_TO_TIMESPEC(&tptr[1], &ts[1]); 2994 } 2995 2996 if (vp == NULL) { 2997 /* note: SEG describes TPTR, not PATH; PATH is always user */ 2998 error = namei_simple_user(path, sflags, &vp); 2999 if (error != 0) 3000 return error; 3001 dorele = 1; 3002 } 3003 3004 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3005 setbirthtime = (VOP_GETATTR(vp, &vattr, l->l_cred) == 0 && 3006 timespeccmp(&ts[1], &vattr.va_birthtime, <)); 3007 VATTR_NULL(&vattr); 3008 vattr.va_atime = ts[0]; 3009 vattr.va_mtime = ts[1]; 3010 if (setbirthtime) 3011 vattr.va_birthtime = ts[1]; 3012 if (vanull) 3013 vattr.va_vaflags |= VA_UTIMES_NULL; 3014 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3015 VOP_UNLOCK(vp, 0); 3016 3017 if (dorele != 0) 3018 vrele(vp); 3019 3020 return error; 3021 } 3022 3023 /* 3024 * Truncate a file given its path name. 3025 */ 3026 /* ARGSUSED */ 3027 int 3028 sys_truncate(struct lwp *l, const struct sys_truncate_args *uap, register_t *retval) 3029 { 3030 /* { 3031 syscallarg(const char *) path; 3032 syscallarg(int) pad; 3033 syscallarg(off_t) length; 3034 } */ 3035 struct vnode *vp; 3036 struct vattr vattr; 3037 int error; 3038 3039 error = namei_simple_user(SCARG(uap, path), 3040 NSM_FOLLOW_TRYEMULROOT, &vp); 3041 if (error != 0) 3042 return (error); 3043 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3044 if (vp->v_type == VDIR) 3045 error = EISDIR; 3046 else if ((error = vn_writechk(vp)) == 0 && 3047 (error = VOP_ACCESS(vp, VWRITE, l->l_cred)) == 0) { 3048 VATTR_NULL(&vattr); 3049 vattr.va_size = SCARG(uap, length); 3050 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3051 } 3052 vput(vp); 3053 return (error); 3054 } 3055 3056 /* 3057 * Truncate a file given a file descriptor. 3058 */ 3059 /* ARGSUSED */ 3060 int 3061 sys_ftruncate(struct lwp *l, const struct sys_ftruncate_args *uap, register_t *retval) 3062 { 3063 /* { 3064 syscallarg(int) fd; 3065 syscallarg(int) pad; 3066 syscallarg(off_t) length; 3067 } */ 3068 struct vattr vattr; 3069 struct vnode *vp; 3070 file_t *fp; 3071 int error; 3072 3073 /* fd_getvnode() will use the descriptor for us */ 3074 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3075 return (error); 3076 if ((fp->f_flag & FWRITE) == 0) { 3077 error = EINVAL; 3078 goto out; 3079 } 3080 vp = fp->f_data; 3081 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3082 if (vp->v_type == VDIR) 3083 error = EISDIR; 3084 else if ((error = vn_writechk(vp)) == 0) { 3085 VATTR_NULL(&vattr); 3086 vattr.va_size = SCARG(uap, length); 3087 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 3088 } 3089 VOP_UNLOCK(vp, 0); 3090 out: 3091 fd_putfile(SCARG(uap, fd)); 3092 return (error); 3093 } 3094 3095 /* 3096 * Sync an open file. 3097 */ 3098 /* ARGSUSED */ 3099 int 3100 sys_fsync(struct lwp *l, const struct sys_fsync_args *uap, register_t *retval) 3101 { 3102 /* { 3103 syscallarg(int) fd; 3104 } */ 3105 struct vnode *vp; 3106 file_t *fp; 3107 int error; 3108 3109 /* fd_getvnode() will use the descriptor for us */ 3110 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3111 return (error); 3112 vp = fp->f_data; 3113 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3114 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0); 3115 VOP_UNLOCK(vp, 0); 3116 fd_putfile(SCARG(uap, fd)); 3117 return (error); 3118 } 3119 3120 /* 3121 * Sync a range of file data. API modeled after that found in AIX. 3122 * 3123 * FDATASYNC indicates that we need only save enough metadata to be able 3124 * to re-read the written data. Note we duplicate AIX's requirement that 3125 * the file be open for writing. 3126 */ 3127 /* ARGSUSED */ 3128 int 3129 sys_fsync_range(struct lwp *l, const struct sys_fsync_range_args *uap, register_t *retval) 3130 { 3131 /* { 3132 syscallarg(int) fd; 3133 syscallarg(int) flags; 3134 syscallarg(off_t) start; 3135 syscallarg(off_t) length; 3136 } */ 3137 struct vnode *vp; 3138 file_t *fp; 3139 int flags, nflags; 3140 off_t s, e, len; 3141 int error; 3142 3143 /* fd_getvnode() will use the descriptor for us */ 3144 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3145 return (error); 3146 3147 if ((fp->f_flag & FWRITE) == 0) { 3148 error = EBADF; 3149 goto out; 3150 } 3151 3152 flags = SCARG(uap, flags); 3153 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 3154 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 3155 error = EINVAL; 3156 goto out; 3157 } 3158 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 3159 if (flags & FDATASYNC) 3160 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 3161 else 3162 nflags = FSYNC_WAIT; 3163 if (flags & FDISKSYNC) 3164 nflags |= FSYNC_CACHE; 3165 3166 len = SCARG(uap, length); 3167 /* If length == 0, we do the whole file, and s = l = 0 will do that */ 3168 if (len) { 3169 s = SCARG(uap, start); 3170 e = s + len; 3171 if (e < s) { 3172 error = EINVAL; 3173 goto out; 3174 } 3175 } else { 3176 e = 0; 3177 s = 0; 3178 } 3179 3180 vp = fp->f_data; 3181 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3182 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e); 3183 VOP_UNLOCK(vp, 0); 3184 out: 3185 fd_putfile(SCARG(uap, fd)); 3186 return (error); 3187 } 3188 3189 /* 3190 * Sync the data of an open file. 3191 */ 3192 /* ARGSUSED */ 3193 int 3194 sys_fdatasync(struct lwp *l, const struct sys_fdatasync_args *uap, register_t *retval) 3195 { 3196 /* { 3197 syscallarg(int) fd; 3198 } */ 3199 struct vnode *vp; 3200 file_t *fp; 3201 int error; 3202 3203 /* fd_getvnode() will use the descriptor for us */ 3204 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3205 return (error); 3206 if ((fp->f_flag & FWRITE) == 0) { 3207 fd_putfile(SCARG(uap, fd)); 3208 return (EBADF); 3209 } 3210 vp = fp->f_data; 3211 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3212 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0); 3213 VOP_UNLOCK(vp, 0); 3214 fd_putfile(SCARG(uap, fd)); 3215 return (error); 3216 } 3217 3218 /* 3219 * Rename files, (standard) BSD semantics frontend. 3220 */ 3221 /* ARGSUSED */ 3222 int 3223 sys_rename(struct lwp *l, const struct sys_rename_args *uap, register_t *retval) 3224 { 3225 /* { 3226 syscallarg(const char *) from; 3227 syscallarg(const char *) to; 3228 } */ 3229 3230 return (do_sys_rename(SCARG(uap, from), SCARG(uap, to), UIO_USERSPACE, 0)); 3231 } 3232 3233 /* 3234 * Rename files, POSIX semantics frontend. 3235 */ 3236 /* ARGSUSED */ 3237 int 3238 sys___posix_rename(struct lwp *l, const struct sys___posix_rename_args *uap, register_t *retval) 3239 { 3240 /* { 3241 syscallarg(const char *) from; 3242 syscallarg(const char *) to; 3243 } */ 3244 3245 return (do_sys_rename(SCARG(uap, from), SCARG(uap, to), UIO_USERSPACE, 1)); 3246 } 3247 3248 /* 3249 * Rename files. Source and destination must either both be directories, 3250 * or both not be directories. If target is a directory, it must be empty. 3251 * If `from' and `to' refer to the same object, the value of the `retain' 3252 * argument is used to determine whether `from' will be 3253 * 3254 * (retain == 0) deleted unless `from' and `to' refer to the same 3255 * object in the file system's name space (BSD). 3256 * (retain == 1) always retained (POSIX). 3257 */ 3258 int 3259 do_sys_rename(const char *from, const char *to, enum uio_seg seg, int retain) 3260 { 3261 struct vnode *tvp, *fvp, *tdvp; 3262 struct nameidata fromnd, tond; 3263 struct mount *fs; 3264 struct lwp *l = curlwp; 3265 struct proc *p; 3266 uint32_t saveflag; 3267 int error; 3268 3269 NDINIT(&fromnd, DELETE, LOCKPARENT | SAVESTART | TRYEMULROOT, 3270 seg, from); 3271 if ((error = namei(&fromnd)) != 0) 3272 return (error); 3273 if (fromnd.ni_dvp != fromnd.ni_vp) 3274 VOP_UNLOCK(fromnd.ni_dvp, 0); 3275 fvp = fromnd.ni_vp; 3276 3277 fs = fvp->v_mount; 3278 error = VFS_RENAMELOCK_ENTER(fs); 3279 if (error) { 3280 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3281 vrele(fromnd.ni_dvp); 3282 vrele(fvp); 3283 goto out1; 3284 } 3285 3286 /* 3287 * close, partially, yet another race - ideally we should only 3288 * go as far as getting fromnd.ni_dvp before getting the per-fs 3289 * lock, and then continue to get fromnd.ni_vp, but we can't do 3290 * that with namei as it stands. 3291 * 3292 * This still won't prevent rmdir from nuking fromnd.ni_vp 3293 * under us. The real fix is to get the locks in the right 3294 * order and do the lookups in the right places, but that's a 3295 * major rototill. 3296 * 3297 * Preserve the SAVESTART in cn_flags, because who knows what 3298 * might happen if we don't. 3299 * 3300 * Note: this logic (as well as this whole function) is cloned 3301 * in nfs_serv.c. Proceed accordingly. 3302 */ 3303 vrele(fvp); 3304 if ((fromnd.ni_cnd.cn_namelen == 1 && 3305 fromnd.ni_cnd.cn_nameptr[0] == '.') || 3306 (fromnd.ni_cnd.cn_namelen == 2 && 3307 fromnd.ni_cnd.cn_nameptr[0] == '.' && 3308 fromnd.ni_cnd.cn_nameptr[1] == '.')) { 3309 error = EINVAL; 3310 VFS_RENAMELOCK_EXIT(fs); 3311 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3312 vrele(fromnd.ni_dvp); 3313 goto out1; 3314 } 3315 saveflag = fromnd.ni_cnd.cn_flags & SAVESTART; 3316 fromnd.ni_cnd.cn_flags &= ~SAVESTART; 3317 vn_lock(fromnd.ni_dvp, LK_EXCLUSIVE | LK_RETRY); 3318 error = relookup(fromnd.ni_dvp, &fromnd.ni_vp, &fromnd.ni_cnd); 3319 fromnd.ni_cnd.cn_flags |= saveflag; 3320 if (error) { 3321 VOP_UNLOCK(fromnd.ni_dvp, 0); 3322 VFS_RENAMELOCK_EXIT(fs); 3323 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3324 vrele(fromnd.ni_dvp); 3325 goto out1; 3326 } 3327 VOP_UNLOCK(fromnd.ni_vp, 0); 3328 if (fromnd.ni_dvp != fromnd.ni_vp) 3329 VOP_UNLOCK(fromnd.ni_dvp, 0); 3330 fvp = fromnd.ni_vp; 3331 3332 NDINIT(&tond, RENAME, 3333 LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | TRYEMULROOT 3334 | (fvp->v_type == VDIR ? CREATEDIR : 0), 3335 seg, to); 3336 if ((error = namei(&tond)) != 0) { 3337 VFS_RENAMELOCK_EXIT(fs); 3338 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3339 vrele(fromnd.ni_dvp); 3340 vrele(fvp); 3341 goto out1; 3342 } 3343 tdvp = tond.ni_dvp; 3344 tvp = tond.ni_vp; 3345 3346 if (tvp != NULL) { 3347 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3348 error = ENOTDIR; 3349 goto out; 3350 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3351 error = EISDIR; 3352 goto out; 3353 } 3354 } 3355 3356 if (fvp == tdvp) 3357 error = EINVAL; 3358 3359 /* 3360 * Source and destination refer to the same object. 3361 */ 3362 if (fvp == tvp) { 3363 if (retain) 3364 error = -1; 3365 else if (fromnd.ni_dvp == tdvp && 3366 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3367 !memcmp(fromnd.ni_cnd.cn_nameptr, 3368 tond.ni_cnd.cn_nameptr, 3369 fromnd.ni_cnd.cn_namelen)) 3370 error = -1; 3371 } 3372 3373 #if NVERIEXEC > 0 3374 if (!error) { 3375 char *f1, *f2; 3376 size_t f1_len; 3377 size_t f2_len; 3378 3379 f1_len = fromnd.ni_cnd.cn_namelen + 1; 3380 f1 = kmem_alloc(f1_len, KM_SLEEP); 3381 strlcpy(f1, fromnd.ni_cnd.cn_nameptr, f1_len); 3382 3383 f2_len = tond.ni_cnd.cn_namelen + 1; 3384 f2 = kmem_alloc(f2_len, KM_SLEEP); 3385 strlcpy(f2, tond.ni_cnd.cn_nameptr, f2_len); 3386 3387 error = veriexec_renamechk(l, fvp, f1, tvp, f2); 3388 3389 kmem_free(f1, f1_len); 3390 kmem_free(f2, f2_len); 3391 } 3392 #endif /* NVERIEXEC > 0 */ 3393 3394 out: 3395 p = l->l_proc; 3396 if (!error) { 3397 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3398 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3399 VFS_RENAMELOCK_EXIT(fs); 3400 } else { 3401 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3402 if (tdvp == tvp) 3403 vrele(tdvp); 3404 else 3405 vput(tdvp); 3406 if (tvp) 3407 vput(tvp); 3408 VFS_RENAMELOCK_EXIT(fs); 3409 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3410 vrele(fromnd.ni_dvp); 3411 vrele(fvp); 3412 } 3413 vrele(tond.ni_startdir); 3414 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3415 out1: 3416 if (fromnd.ni_startdir) 3417 vrele(fromnd.ni_startdir); 3418 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3419 return (error == -1 ? 0 : error); 3420 } 3421 3422 /* 3423 * Make a directory file. 3424 */ 3425 /* ARGSUSED */ 3426 int 3427 sys_mkdir(struct lwp *l, const struct sys_mkdir_args *uap, register_t *retval) 3428 { 3429 /* { 3430 syscallarg(const char *) path; 3431 syscallarg(int) mode; 3432 } */ 3433 3434 return do_sys_mkdir(SCARG(uap, path), SCARG(uap, mode), UIO_USERSPACE); 3435 } 3436 3437 int 3438 do_sys_mkdir(const char *path, mode_t mode, enum uio_seg seg) 3439 { 3440 struct proc *p = curlwp->l_proc; 3441 struct vnode *vp; 3442 struct vattr vattr; 3443 int error; 3444 struct nameidata nd; 3445 3446 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT, 3447 seg, path); 3448 if ((error = namei(&nd)) != 0) 3449 return (error); 3450 vp = nd.ni_vp; 3451 if (vp != NULL) { 3452 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3453 if (nd.ni_dvp == vp) 3454 vrele(nd.ni_dvp); 3455 else 3456 vput(nd.ni_dvp); 3457 vrele(vp); 3458 return (EEXIST); 3459 } 3460 VATTR_NULL(&vattr); 3461 vattr.va_type = VDIR; 3462 /* We will read cwdi->cwdi_cmask unlocked. */ 3463 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3464 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3465 if (!error) 3466 vput(nd.ni_vp); 3467 return (error); 3468 } 3469 3470 /* 3471 * Remove a directory file. 3472 */ 3473 /* ARGSUSED */ 3474 int 3475 sys_rmdir(struct lwp *l, const struct sys_rmdir_args *uap, register_t *retval) 3476 { 3477 /* { 3478 syscallarg(const char *) path; 3479 } */ 3480 struct vnode *vp; 3481 int error; 3482 struct nameidata nd; 3483 3484 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, 3485 SCARG(uap, path)); 3486 if ((error = namei(&nd)) != 0) 3487 return (error); 3488 vp = nd.ni_vp; 3489 if (vp->v_type != VDIR) { 3490 error = ENOTDIR; 3491 goto out; 3492 } 3493 /* 3494 * No rmdir "." please. 3495 */ 3496 if (nd.ni_dvp == vp) { 3497 error = EINVAL; 3498 goto out; 3499 } 3500 /* 3501 * The root of a mounted filesystem cannot be deleted. 3502 */ 3503 if ((vp->v_vflag & VV_ROOT) != 0 || vp->v_mountedhere != NULL) { 3504 error = EBUSY; 3505 goto out; 3506 } 3507 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3508 return (error); 3509 3510 out: 3511 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3512 if (nd.ni_dvp == vp) 3513 vrele(nd.ni_dvp); 3514 else 3515 vput(nd.ni_dvp); 3516 vput(vp); 3517 return (error); 3518 } 3519 3520 /* 3521 * Read a block of directory entries in a file system independent format. 3522 */ 3523 int 3524 sys___getdents30(struct lwp *l, const struct sys___getdents30_args *uap, register_t *retval) 3525 { 3526 /* { 3527 syscallarg(int) fd; 3528 syscallarg(char *) buf; 3529 syscallarg(size_t) count; 3530 } */ 3531 file_t *fp; 3532 int error, done; 3533 3534 /* fd_getvnode() will use the descriptor for us */ 3535 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3536 return (error); 3537 if ((fp->f_flag & FREAD) == 0) { 3538 error = EBADF; 3539 goto out; 3540 } 3541 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3542 SCARG(uap, count), &done, l, 0, 0); 3543 ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, buf), done, error); 3544 *retval = done; 3545 out: 3546 fd_putfile(SCARG(uap, fd)); 3547 return (error); 3548 } 3549 3550 /* 3551 * Set the mode mask for creation of filesystem nodes. 3552 */ 3553 int 3554 sys_umask(struct lwp *l, const struct sys_umask_args *uap, register_t *retval) 3555 { 3556 /* { 3557 syscallarg(mode_t) newmask; 3558 } */ 3559 struct proc *p = l->l_proc; 3560 struct cwdinfo *cwdi; 3561 3562 /* 3563 * cwdi->cwdi_cmask will be read unlocked elsewhere. What's 3564 * important is that we serialize changes to the mask. The 3565 * rw_exit() will issue a write memory barrier on our behalf, 3566 * and force the changes out to other CPUs (as it must use an 3567 * atomic operation, draining the local CPU's store buffers). 3568 */ 3569 cwdi = p->p_cwdi; 3570 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 3571 *retval = cwdi->cwdi_cmask; 3572 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3573 rw_exit(&cwdi->cwdi_lock); 3574 3575 return (0); 3576 } 3577 3578 int 3579 dorevoke(struct vnode *vp, kauth_cred_t cred) 3580 { 3581 struct vattr vattr; 3582 int error; 3583 3584 vn_lock(vp, LK_SHARED | LK_RETRY); 3585 error = VOP_GETATTR(vp, &vattr, cred); 3586 VOP_UNLOCK(vp, 0); 3587 if (error != 0) 3588 return error; 3589 if (kauth_cred_geteuid(cred) == vattr.va_uid || 3590 (error = kauth_authorize_generic(cred, 3591 KAUTH_GENERIC_ISSUSER, NULL)) == 0) 3592 VOP_REVOKE(vp, REVOKEALL); 3593 return (error); 3594 } 3595 3596 /* 3597 * Void all references to file by ripping underlying filesystem 3598 * away from vnode. 3599 */ 3600 /* ARGSUSED */ 3601 int 3602 sys_revoke(struct lwp *l, const struct sys_revoke_args *uap, register_t *retval) 3603 { 3604 /* { 3605 syscallarg(const char *) path; 3606 } */ 3607 struct vnode *vp; 3608 int error; 3609 3610 error = namei_simple_user(SCARG(uap, path), 3611 NSM_FOLLOW_TRYEMULROOT, &vp); 3612 if (error != 0) 3613 return (error); 3614 error = dorevoke(vp, l->l_cred); 3615 vrele(vp); 3616 return (error); 3617 } 3618
Indexes created Fri Oct 03 02:09:57 GMT 2025