vfs_syscalls.c revision 1.457
1 /* $NetBSD: vfs_syscalls.c,v 1.457 2012/06/27 12:28:28 cheusov 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 /* 69 * Virtual File System System Calls 70 */ 71 72 #include <sys/cdefs.h> 73 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.457 2012/06/27 12:28:28 cheusov Exp $"); 74 75 #ifdef _KERNEL_OPT 76 #include "opt_fileassoc.h" 77 #include "veriexec.h" 78 #endif 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/namei.h> 83 #include <sys/filedesc.h> 84 #include <sys/kernel.h> 85 #include <sys/file.h> 86 #include <sys/fcntl.h> 87 #include <sys/stat.h> 88 #include <sys/vnode.h> 89 #include <sys/mount.h> 90 #include <sys/proc.h> 91 #include <sys/uio.h> 92 #include <sys/kmem.h> 93 #include <sys/dirent.h> 94 #include <sys/sysctl.h> 95 #include <sys/syscallargs.h> 96 #include <sys/vfs_syscalls.h> 97 #include <sys/quota.h> 98 #include <sys/quotactl.h> 99 #include <sys/ktrace.h> 100 #ifdef FILEASSOC 101 #include <sys/fileassoc.h> 102 #endif /* FILEASSOC */ 103 #include <sys/extattr.h> 104 #include <sys/verified_exec.h> 105 #include <sys/kauth.h> 106 #include <sys/atomic.h> 107 #include <sys/module.h> 108 #include <sys/buf.h> 109 110 #include <miscfs/genfs/genfs.h> 111 #include <miscfs/syncfs/syncfs.h> 112 #include <miscfs/specfs/specdev.h> 113 114 #include <nfs/rpcv2.h> 115 #include <nfs/nfsproto.h> 116 #include <nfs/nfs.h> 117 #include <nfs/nfs_var.h> 118 119 static int change_flags(struct vnode *, u_long, struct lwp *); 120 static int change_mode(struct vnode *, int, struct lwp *l); 121 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); 122 static int do_open(lwp_t *, struct pathbuf *, int, int, int *); 123 124 /* 125 * This table is used to maintain compatibility with 4.3BSD 126 * and NetBSD 0.9 mount syscalls - and possibly other systems. 127 * Note, the order is important! 128 * 129 * Do not modify this table. It should only contain filesystems 130 * supported by NetBSD 0.9 and 4.3BSD. 131 */ 132 const char * const mountcompatnames[] = { 133 NULL, /* 0 = MOUNT_NONE */ 134 MOUNT_FFS, /* 1 = MOUNT_UFS */ 135 MOUNT_NFS, /* 2 */ 136 MOUNT_MFS, /* 3 */ 137 MOUNT_MSDOS, /* 4 */ 138 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 139 MOUNT_FDESC, /* 6 */ 140 MOUNT_KERNFS, /* 7 */ 141 NULL, /* 8 = MOUNT_DEVFS */ 142 MOUNT_AFS, /* 9 */ 143 }; 144 145 const int nmountcompatnames = __arraycount(mountcompatnames); 146 147 static int 148 open_setfp(struct lwp *l, file_t *fp, struct vnode *vp, int indx, int flags) 149 { 150 int error; 151 152 fp->f_flag = flags & FMASK; 153 fp->f_type = DTYPE_VNODE; 154 fp->f_ops = &vnops; 155 fp->f_data = vp; 156 157 if (flags & (O_EXLOCK | O_SHLOCK)) { 158 struct flock lf; 159 int type; 160 161 lf.l_whence = SEEK_SET; 162 lf.l_start = 0; 163 lf.l_len = 0; 164 if (flags & O_EXLOCK) 165 lf.l_type = F_WRLCK; 166 else 167 lf.l_type = F_RDLCK; 168 type = F_FLOCK; 169 if ((flags & FNONBLOCK) == 0) 170 type |= F_WAIT; 171 VOP_UNLOCK(vp); 172 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 173 if (error) { 174 (void) vn_close(vp, fp->f_flag, fp->f_cred); 175 fd_abort(l->l_proc, fp, indx); 176 return error; 177 } 178 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 179 atomic_or_uint(&fp->f_flag, FHASLOCK); 180 } 181 if (flags & O_CLOEXEC) 182 fd_set_exclose(l, indx, true); 183 return 0; 184 } 185 186 static int 187 mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags, 188 void *data, size_t *data_len) 189 { 190 struct mount *mp; 191 int error = 0, saved_flags; 192 193 mp = vp->v_mount; 194 saved_flags = mp->mnt_flag; 195 196 /* We can operate only on VV_ROOT nodes. */ 197 if ((vp->v_vflag & VV_ROOT) == 0) { 198 error = EINVAL; 199 goto out; 200 } 201 202 /* 203 * We only allow the filesystem to be reloaded if it 204 * is currently mounted read-only. Additionally, we 205 * prevent read-write to read-only downgrades. 206 */ 207 if ((flags & (MNT_RELOAD | MNT_RDONLY)) != 0 && 208 (mp->mnt_flag & MNT_RDONLY) == 0 && 209 (mp->mnt_iflag & IMNT_CAN_RWTORO) == 0) { 210 error = EOPNOTSUPP; /* Needs translation */ 211 goto out; 212 } 213 214 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 215 KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data); 216 if (error) 217 goto out; 218 219 if (vfs_busy(mp, NULL)) { 220 error = EPERM; 221 goto out; 222 } 223 224 mutex_enter(&mp->mnt_updating); 225 226 mp->mnt_flag &= ~MNT_OP_FLAGS; 227 mp->mnt_flag |= flags & MNT_OP_FLAGS; 228 229 /* 230 * Set the mount level flags. 231 */ 232 if (flags & MNT_RDONLY) 233 mp->mnt_flag |= MNT_RDONLY; 234 else if (mp->mnt_flag & MNT_RDONLY) 235 mp->mnt_iflag |= IMNT_WANTRDWR; 236 mp->mnt_flag &= ~MNT_BASIC_FLAGS; 237 mp->mnt_flag |= flags & MNT_BASIC_FLAGS; 238 error = VFS_MOUNT(mp, path, data, data_len); 239 240 if (error && data != NULL) { 241 int error2; 242 243 /* 244 * Update failed; let's try and see if it was an 245 * export request. For compat with 3.0 and earlier. 246 */ 247 error2 = vfs_hooks_reexport(mp, path, data); 248 249 /* 250 * Only update error code if the export request was 251 * understood but some problem occurred while 252 * processing it. 253 */ 254 if (error2 != EJUSTRETURN) 255 error = error2; 256 } 257 258 if (mp->mnt_iflag & IMNT_WANTRDWR) 259 mp->mnt_flag &= ~MNT_RDONLY; 260 if (error) 261 mp->mnt_flag = saved_flags; 262 mp->mnt_flag &= ~MNT_OP_FLAGS; 263 mp->mnt_iflag &= ~IMNT_WANTRDWR; 264 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 265 if (mp->mnt_syncer == NULL) 266 error = vfs_allocate_syncvnode(mp); 267 } else { 268 if (mp->mnt_syncer != NULL) 269 vfs_deallocate_syncvnode(mp); 270 } 271 mutex_exit(&mp->mnt_updating); 272 vfs_unbusy(mp, false, NULL); 273 274 if ((error == 0) && !(saved_flags & MNT_EXTATTR) && 275 (flags & MNT_EXTATTR)) { 276 if (VFS_EXTATTRCTL(mp, EXTATTR_CMD_START, 277 NULL, 0, NULL) != 0) { 278 printf("%s: failed to start extattr, error = %d", 279 mp->mnt_stat.f_mntonname, error); 280 mp->mnt_flag &= ~MNT_EXTATTR; 281 } 282 } 283 284 if ((error == 0) && (saved_flags & MNT_EXTATTR) && 285 !(flags & MNT_EXTATTR)) { 286 if (VFS_EXTATTRCTL(mp, EXTATTR_CMD_STOP, 287 NULL, 0, NULL) != 0) { 288 printf("%s: failed to stop extattr, error = %d", 289 mp->mnt_stat.f_mntonname, error); 290 mp->mnt_flag |= MNT_RDONLY; 291 } 292 } 293 out: 294 return (error); 295 } 296 297 static int 298 mount_get_vfsops(const char *fstype, struct vfsops **vfsops) 299 { 300 char fstypename[sizeof(((struct statvfs *)NULL)->f_fstypename)]; 301 int error; 302 303 /* Copy file-system type from userspace. */ 304 error = copyinstr(fstype, fstypename, sizeof(fstypename), NULL); 305 if (error) { 306 /* 307 * Historically, filesystem types were identified by numbers. 308 * If we get an integer for the filesystem type instead of a 309 * string, we check to see if it matches one of the historic 310 * filesystem types. 311 */ 312 u_long fsindex = (u_long)fstype; 313 if (fsindex >= nmountcompatnames || 314 mountcompatnames[fsindex] == NULL) 315 return ENODEV; 316 strlcpy(fstypename, mountcompatnames[fsindex], 317 sizeof(fstypename)); 318 } 319 320 /* Accept `ufs' as an alias for `ffs', for compatibility. */ 321 if (strcmp(fstypename, "ufs") == 0) 322 fstypename[0] = 'f'; 323 324 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 325 return 0; 326 327 /* If we can autoload a vfs module, try again */ 328 (void)module_autoload(fstypename, MODULE_CLASS_VFS); 329 330 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 331 return 0; 332 333 return ENODEV; 334 } 335 336 static int 337 mount_getargs(struct lwp *l, struct vnode *vp, const char *path, int flags, 338 void *data, size_t *data_len) 339 { 340 struct mount *mp; 341 int error; 342 343 /* If MNT_GETARGS is specified, it should be the only flag. */ 344 if (flags & ~MNT_GETARGS) 345 return EINVAL; 346 347 mp = vp->v_mount; 348 349 /* XXX: probably some notion of "can see" here if we want isolation. */ 350 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 351 KAUTH_REQ_SYSTEM_MOUNT_GET, mp, data, NULL); 352 if (error) 353 return error; 354 355 if ((vp->v_vflag & VV_ROOT) == 0) 356 return EINVAL; 357 358 if (vfs_busy(mp, NULL)) 359 return EPERM; 360 361 mutex_enter(&mp->mnt_updating); 362 mp->mnt_flag &= ~MNT_OP_FLAGS; 363 mp->mnt_flag |= MNT_GETARGS; 364 error = VFS_MOUNT(mp, path, data, data_len); 365 mp->mnt_flag &= ~MNT_OP_FLAGS; 366 mutex_exit(&mp->mnt_updating); 367 368 vfs_unbusy(mp, false, NULL); 369 return (error); 370 } 371 372 int 373 sys___mount50(struct lwp *l, const struct sys___mount50_args *uap, register_t *retval) 374 { 375 /* { 376 syscallarg(const char *) type; 377 syscallarg(const char *) path; 378 syscallarg(int) flags; 379 syscallarg(void *) data; 380 syscallarg(size_t) data_len; 381 } */ 382 383 return do_sys_mount(l, NULL, SCARG(uap, type), SCARG(uap, path), 384 SCARG(uap, flags), SCARG(uap, data), UIO_USERSPACE, 385 SCARG(uap, data_len), retval); 386 } 387 388 int 389 do_sys_mount(struct lwp *l, struct vfsops *vfsops, const char *type, 390 const char *path, int flags, void *data, enum uio_seg data_seg, 391 size_t data_len, register_t *retval) 392 { 393 struct vnode *vp; 394 void *data_buf = data; 395 bool vfsopsrele = false; 396 int error; 397 398 /* XXX: The calling convention of this routine is totally bizarre */ 399 if (vfsops) 400 vfsopsrele = true; 401 402 /* 403 * Get vnode to be covered 404 */ 405 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 406 if (error != 0) { 407 vp = NULL; 408 goto done; 409 } 410 411 if (vfsops == NULL) { 412 if (flags & (MNT_GETARGS | MNT_UPDATE)) { 413 vfsops = vp->v_mount->mnt_op; 414 } else { 415 /* 'type' is userspace */ 416 error = mount_get_vfsops(type, &vfsops); 417 if (error != 0) 418 goto done; 419 vfsopsrele = true; 420 } 421 } 422 423 if (data != NULL && data_seg == UIO_USERSPACE) { 424 if (data_len == 0) { 425 /* No length supplied, use default for filesystem */ 426 data_len = vfsops->vfs_min_mount_data; 427 if (data_len > VFS_MAX_MOUNT_DATA) { 428 error = EINVAL; 429 goto done; 430 } 431 /* 432 * Hopefully a longer buffer won't make copyin() fail. 433 * For compatibility with 3.0 and earlier. 434 */ 435 if (flags & MNT_UPDATE 436 && data_len < sizeof (struct mnt_export_args30)) 437 data_len = sizeof (struct mnt_export_args30); 438 } 439 data_buf = kmem_alloc(data_len, KM_SLEEP); 440 441 /* NFS needs the buffer even for mnt_getargs .... */ 442 error = copyin(data, data_buf, data_len); 443 if (error != 0) 444 goto done; 445 } 446 447 if (flags & MNT_GETARGS) { 448 if (data_len == 0) { 449 error = EINVAL; 450 goto done; 451 } 452 error = mount_getargs(l, vp, path, flags, data_buf, &data_len); 453 if (error != 0) 454 goto done; 455 if (data_seg == UIO_USERSPACE) 456 error = copyout(data_buf, data, data_len); 457 *retval = data_len; 458 } else if (flags & MNT_UPDATE) { 459 error = mount_update(l, vp, path, flags, data_buf, &data_len); 460 } else { 461 /* Locking is handled internally in mount_domount(). */ 462 KASSERT(vfsopsrele == true); 463 error = mount_domount(l, &vp, vfsops, path, flags, data_buf, 464 &data_len); 465 vfsopsrele = false; 466 } 467 468 done: 469 if (vfsopsrele) 470 vfs_delref(vfsops); 471 if (vp != NULL) { 472 vrele(vp); 473 } 474 if (data_buf != data) 475 kmem_free(data_buf, data_len); 476 return (error); 477 } 478 479 /* 480 * Unmount a file system. 481 * 482 * Note: unmount takes a path to the vnode mounted on as argument, 483 * not special file (as before). 484 */ 485 /* ARGSUSED */ 486 int 487 sys_unmount(struct lwp *l, const struct sys_unmount_args *uap, register_t *retval) 488 { 489 /* { 490 syscallarg(const char *) path; 491 syscallarg(int) flags; 492 } */ 493 struct vnode *vp; 494 struct mount *mp; 495 int error; 496 struct pathbuf *pb; 497 struct nameidata nd; 498 499 error = pathbuf_copyin(SCARG(uap, path), &pb); 500 if (error) { 501 return error; 502 } 503 504 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 505 if ((error = namei(&nd)) != 0) { 506 pathbuf_destroy(pb); 507 return error; 508 } 509 vp = nd.ni_vp; 510 pathbuf_destroy(pb); 511 512 mp = vp->v_mount; 513 atomic_inc_uint(&mp->mnt_refcnt); 514 VOP_UNLOCK(vp); 515 516 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 517 KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT, mp, NULL, NULL); 518 if (error) { 519 vrele(vp); 520 vfs_destroy(mp); 521 return (error); 522 } 523 524 /* 525 * Don't allow unmounting the root file system. 526 */ 527 if (mp->mnt_flag & MNT_ROOTFS) { 528 vrele(vp); 529 vfs_destroy(mp); 530 return (EINVAL); 531 } 532 533 /* 534 * Must be the root of the filesystem 535 */ 536 if ((vp->v_vflag & VV_ROOT) == 0) { 537 vrele(vp); 538 vfs_destroy(mp); 539 return (EINVAL); 540 } 541 542 vrele(vp); 543 error = dounmount(mp, SCARG(uap, flags), l); 544 vfs_destroy(mp); 545 return error; 546 } 547 548 /* 549 * Sync each mounted filesystem. 550 */ 551 #ifdef DEBUG 552 int syncprt = 0; 553 struct ctldebug debug0 = { "syncprt", &syncprt }; 554 #endif 555 556 void 557 do_sys_sync(struct lwp *l) 558 { 559 struct mount *mp, *nmp; 560 int asyncflag; 561 562 mutex_enter(&mountlist_lock); 563 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 564 mp = nmp) { 565 if (vfs_busy(mp, &nmp)) { 566 continue; 567 } 568 mutex_enter(&mp->mnt_updating); 569 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 570 asyncflag = mp->mnt_flag & MNT_ASYNC; 571 mp->mnt_flag &= ~MNT_ASYNC; 572 VFS_SYNC(mp, MNT_NOWAIT, l->l_cred); 573 if (asyncflag) 574 mp->mnt_flag |= MNT_ASYNC; 575 } 576 mutex_exit(&mp->mnt_updating); 577 vfs_unbusy(mp, false, &nmp); 578 } 579 mutex_exit(&mountlist_lock); 580 #ifdef DEBUG 581 if (syncprt) 582 vfs_bufstats(); 583 #endif /* DEBUG */ 584 } 585 586 /* ARGSUSED */ 587 int 588 sys_sync(struct lwp *l, const void *v, register_t *retval) 589 { 590 do_sys_sync(l); 591 return (0); 592 } 593 594 595 /* 596 * Access or change filesystem quotas. 597 * 598 * (this is really 14 different calls bundled into one) 599 */ 600 601 static int 602 do_sys_quotactl_stat(struct mount *mp, struct quotastat *info_u) 603 { 604 struct quotastat info_k; 605 int error; 606 607 /* ensure any padding bytes are cleared */ 608 memset(&info_k, 0, sizeof(info_k)); 609 610 error = vfs_quotactl_stat(mp, &info_k); 611 if (error) { 612 return error; 613 } 614 615 return copyout(&info_k, info_u, sizeof(info_k)); 616 } 617 618 static int 619 do_sys_quotactl_idtypestat(struct mount *mp, int idtype, 620 struct quotaidtypestat *info_u) 621 { 622 struct quotaidtypestat info_k; 623 int error; 624 625 /* ensure any padding bytes are cleared */ 626 memset(&info_k, 0, sizeof(info_k)); 627 628 error = vfs_quotactl_idtypestat(mp, idtype, &info_k); 629 if (error) { 630 return error; 631 } 632 633 return copyout(&info_k, info_u, sizeof(info_k)); 634 } 635 636 static int 637 do_sys_quotactl_objtypestat(struct mount *mp, int objtype, 638 struct quotaobjtypestat *info_u) 639 { 640 struct quotaobjtypestat info_k; 641 int error; 642 643 /* ensure any padding bytes are cleared */ 644 memset(&info_k, 0, sizeof(info_k)); 645 646 error = vfs_quotactl_objtypestat(mp, objtype, &info_k); 647 if (error) { 648 return error; 649 } 650 651 return copyout(&info_k, info_u, sizeof(info_k)); 652 } 653 654 static int 655 do_sys_quotactl_get(struct mount *mp, const struct quotakey *key_u, 656 struct quotaval *val_u) 657 { 658 struct quotakey key_k; 659 struct quotaval val_k; 660 int error; 661 662 /* ensure any padding bytes are cleared */ 663 memset(&val_k, 0, sizeof(val_k)); 664 665 error = copyin(key_u, &key_k, sizeof(key_k)); 666 if (error) { 667 return error; 668 } 669 670 error = vfs_quotactl_get(mp, &key_k, &val_k); 671 if (error) { 672 return error; 673 } 674 675 return copyout(&val_k, val_u, sizeof(val_k)); 676 } 677 678 static int 679 do_sys_quotactl_put(struct mount *mp, const struct quotakey *key_u, 680 const struct quotaval *val_u) 681 { 682 struct quotakey key_k; 683 struct quotaval val_k; 684 int error; 685 686 error = copyin(key_u, &key_k, sizeof(key_k)); 687 if (error) { 688 return error; 689 } 690 691 error = copyin(val_u, &val_k, sizeof(val_k)); 692 if (error) { 693 return error; 694 } 695 696 return vfs_quotactl_put(mp, &key_k, &val_k); 697 } 698 699 static int 700 do_sys_quotactl_delete(struct mount *mp, const struct quotakey *key_u) 701 { 702 struct quotakey key_k; 703 int error; 704 705 error = copyin(key_u, &key_k, sizeof(key_k)); 706 if (error) { 707 return error; 708 } 709 710 return vfs_quotactl_delete(mp, &key_k); 711 } 712 713 static int 714 do_sys_quotactl_cursoropen(struct mount *mp, struct quotakcursor *cursor_u) 715 { 716 struct quotakcursor cursor_k; 717 int error; 718 719 /* ensure any padding bytes are cleared */ 720 memset(&cursor_k, 0, sizeof(cursor_k)); 721 722 error = vfs_quotactl_cursoropen(mp, &cursor_k); 723 if (error) { 724 return error; 725 } 726 727 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 728 } 729 730 static int 731 do_sys_quotactl_cursorclose(struct mount *mp, struct quotakcursor *cursor_u) 732 { 733 struct quotakcursor cursor_k; 734 int error; 735 736 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 737 if (error) { 738 return error; 739 } 740 741 return vfs_quotactl_cursorclose(mp, &cursor_k); 742 } 743 744 static int 745 do_sys_quotactl_cursorskipidtype(struct mount *mp, 746 struct quotakcursor *cursor_u, int idtype) 747 { 748 struct quotakcursor cursor_k; 749 int error; 750 751 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 752 if (error) { 753 return error; 754 } 755 756 error = vfs_quotactl_cursorskipidtype(mp, &cursor_k, idtype); 757 if (error) { 758 return error; 759 } 760 761 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 762 } 763 764 static int 765 do_sys_quotactl_cursorget(struct mount *mp, struct quotakcursor *cursor_u, 766 struct quotakey *keys_u, struct quotaval *vals_u, unsigned maxnum, 767 unsigned *ret_u) 768 { 769 #define CGET_STACK_MAX 8 770 struct quotakcursor cursor_k; 771 struct quotakey stackkeys[CGET_STACK_MAX]; 772 struct quotaval stackvals[CGET_STACK_MAX]; 773 struct quotakey *keys_k; 774 struct quotaval *vals_k; 775 unsigned ret_k; 776 int error; 777 778 if (maxnum > 128) { 779 maxnum = 128; 780 } 781 782 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 783 if (error) { 784 return error; 785 } 786 787 if (maxnum <= CGET_STACK_MAX) { 788 keys_k = stackkeys; 789 vals_k = stackvals; 790 /* ensure any padding bytes are cleared */ 791 memset(keys_k, 0, maxnum * sizeof(keys_k[0])); 792 memset(vals_k, 0, maxnum * sizeof(vals_k[0])); 793 } else { 794 keys_k = kmem_zalloc(maxnum * sizeof(keys_k[0]), KM_SLEEP); 795 vals_k = kmem_zalloc(maxnum * sizeof(vals_k[0]), KM_SLEEP); 796 } 797 798 error = vfs_quotactl_cursorget(mp, &cursor_k, keys_k, vals_k, maxnum, 799 &ret_k); 800 if (error) { 801 goto fail; 802 } 803 804 error = copyout(keys_k, keys_u, ret_k * sizeof(keys_k[0])); 805 if (error) { 806 goto fail; 807 } 808 809 error = copyout(vals_k, vals_u, ret_k * sizeof(vals_k[0])); 810 if (error) { 811 goto fail; 812 } 813 814 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 815 if (error) { 816 goto fail; 817 } 818 819 /* do last to maximize the chance of being able to recover a failure */ 820 error = copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 821 822 fail: 823 if (keys_k != stackkeys) { 824 kmem_free(keys_k, maxnum * sizeof(keys_k[0])); 825 } 826 if (vals_k != stackvals) { 827 kmem_free(vals_k, maxnum * sizeof(vals_k[0])); 828 } 829 return error; 830 } 831 832 static int 833 do_sys_quotactl_cursoratend(struct mount *mp, struct quotakcursor *cursor_u, 834 int *ret_u) 835 { 836 struct quotakcursor cursor_k; 837 int ret_k; 838 int error; 839 840 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 841 if (error) { 842 return error; 843 } 844 845 error = vfs_quotactl_cursoratend(mp, &cursor_k, &ret_k); 846 if (error) { 847 return error; 848 } 849 850 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 851 if (error) { 852 return error; 853 } 854 855 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 856 } 857 858 static int 859 do_sys_quotactl_cursorrewind(struct mount *mp, struct quotakcursor *cursor_u) 860 { 861 struct quotakcursor cursor_k; 862 int error; 863 864 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 865 if (error) { 866 return error; 867 } 868 869 error = vfs_quotactl_cursorrewind(mp, &cursor_k); 870 if (error) { 871 return error; 872 } 873 874 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 875 } 876 877 static int 878 do_sys_quotactl_quotaon(struct mount *mp, int idtype, const char *path_u) 879 { 880 char *path_k; 881 int error; 882 883 /* XXX this should probably be a struct pathbuf */ 884 path_k = PNBUF_GET(); 885 error = copyin(path_u, path_k, PATH_MAX); 886 if (error) { 887 PNBUF_PUT(path_k); 888 return error; 889 } 890 891 error = vfs_quotactl_quotaon(mp, idtype, path_k); 892 893 PNBUF_PUT(path_k); 894 return error; 895 } 896 897 static int 898 do_sys_quotactl_quotaoff(struct mount *mp, int idtype) 899 { 900 return vfs_quotactl_quotaoff(mp, idtype); 901 } 902 903 int 904 do_sys_quotactl(const char *path_u, const struct quotactl_args *args) 905 { 906 struct mount *mp; 907 struct vnode *vp; 908 int error; 909 910 error = namei_simple_user(path_u, NSM_FOLLOW_TRYEMULROOT, &vp); 911 if (error != 0) 912 return (error); 913 mp = vp->v_mount; 914 915 switch (args->qc_op) { 916 case QUOTACTL_STAT: 917 error = do_sys_quotactl_stat(mp, args->u.stat.qc_info); 918 break; 919 case QUOTACTL_IDTYPESTAT: 920 error = do_sys_quotactl_idtypestat(mp, 921 args->u.idtypestat.qc_idtype, 922 args->u.idtypestat.qc_info); 923 break; 924 case QUOTACTL_OBJTYPESTAT: 925 error = do_sys_quotactl_objtypestat(mp, 926 args->u.objtypestat.qc_objtype, 927 args->u.objtypestat.qc_info); 928 break; 929 case QUOTACTL_GET: 930 error = do_sys_quotactl_get(mp, 931 args->u.get.qc_key, 932 args->u.get.qc_val); 933 break; 934 case QUOTACTL_PUT: 935 error = do_sys_quotactl_put(mp, 936 args->u.put.qc_key, 937 args->u.put.qc_val); 938 break; 939 case QUOTACTL_DELETE: 940 error = do_sys_quotactl_delete(mp, args->u.delete.qc_key); 941 break; 942 case QUOTACTL_CURSOROPEN: 943 error = do_sys_quotactl_cursoropen(mp, 944 args->u.cursoropen.qc_cursor); 945 break; 946 case QUOTACTL_CURSORCLOSE: 947 error = do_sys_quotactl_cursorclose(mp, 948 args->u.cursorclose.qc_cursor); 949 break; 950 case QUOTACTL_CURSORSKIPIDTYPE: 951 error = do_sys_quotactl_cursorskipidtype(mp, 952 args->u.cursorskipidtype.qc_cursor, 953 args->u.cursorskipidtype.qc_idtype); 954 break; 955 case QUOTACTL_CURSORGET: 956 error = do_sys_quotactl_cursorget(mp, 957 args->u.cursorget.qc_cursor, 958 args->u.cursorget.qc_keys, 959 args->u.cursorget.qc_vals, 960 args->u.cursorget.qc_maxnum, 961 args->u.cursorget.qc_ret); 962 break; 963 case QUOTACTL_CURSORATEND: 964 error = do_sys_quotactl_cursoratend(mp, 965 args->u.cursoratend.qc_cursor, 966 args->u.cursoratend.qc_ret); 967 break; 968 case QUOTACTL_CURSORREWIND: 969 error = do_sys_quotactl_cursorrewind(mp, 970 args->u.cursorrewind.qc_cursor); 971 break; 972 case QUOTACTL_QUOTAON: 973 error = do_sys_quotactl_quotaon(mp, 974 args->u.quotaon.qc_idtype, 975 args->u.quotaon.qc_quotafile); 976 break; 977 case QUOTACTL_QUOTAOFF: 978 error = do_sys_quotactl_quotaoff(mp, 979 args->u.quotaoff.qc_idtype); 980 break; 981 default: 982 error = EINVAL; 983 break; 984 } 985 986 vrele(vp); 987 return error; 988 } 989 990 /* ARGSUSED */ 991 int 992 sys___quotactl(struct lwp *l, const struct sys___quotactl_args *uap, 993 register_t *retval) 994 { 995 /* { 996 syscallarg(const char *) path; 997 syscallarg(struct quotactl_args *) args; 998 } */ 999 struct quotactl_args args; 1000 int error; 1001 1002 error = copyin(SCARG(uap, args), &args, sizeof(args)); 1003 if (error) { 1004 return error; 1005 } 1006 1007 return do_sys_quotactl(SCARG(uap, path), &args); 1008 } 1009 1010 int 1011 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 1012 int root) 1013 { 1014 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 1015 int error = 0; 1016 1017 /* 1018 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1019 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 1020 * overrides MNT_NOWAIT. 1021 */ 1022 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 1023 (flags != MNT_WAIT && flags != 0)) { 1024 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 1025 goto done; 1026 } 1027 1028 /* Get the filesystem stats now */ 1029 memset(sp, 0, sizeof(*sp)); 1030 if ((error = VFS_STATVFS(mp, sp)) != 0) { 1031 return error; 1032 } 1033 1034 if (cwdi->cwdi_rdir == NULL) 1035 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 1036 done: 1037 if (cwdi->cwdi_rdir != NULL) { 1038 size_t len; 1039 char *bp; 1040 char c; 1041 char *path = PNBUF_GET(); 1042 1043 bp = path + MAXPATHLEN; 1044 *--bp = '\0'; 1045 rw_enter(&cwdi->cwdi_lock, RW_READER); 1046 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 1047 MAXPATHLEN / 2, 0, l); 1048 rw_exit(&cwdi->cwdi_lock); 1049 if (error) { 1050 PNBUF_PUT(path); 1051 return error; 1052 } 1053 len = strlen(bp); 1054 if (len != 1) { 1055 /* 1056 * for mount points that are below our root, we can see 1057 * them, so we fix up the pathname and return them. The 1058 * rest we cannot see, so we don't allow viewing the 1059 * data. 1060 */ 1061 if (strncmp(bp, sp->f_mntonname, len) == 0 && 1062 ((c = sp->f_mntonname[len]) == '/' || c == '\0')) { 1063 (void)strlcpy(sp->f_mntonname, 1064 c == '\0' ? "/" : &sp->f_mntonname[len], 1065 sizeof(sp->f_mntonname)); 1066 } else { 1067 if (root) 1068 (void)strlcpy(sp->f_mntonname, "/", 1069 sizeof(sp->f_mntonname)); 1070 else 1071 error = EPERM; 1072 } 1073 } 1074 PNBUF_PUT(path); 1075 } 1076 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 1077 return error; 1078 } 1079 1080 /* 1081 * Get filesystem statistics by path. 1082 */ 1083 int 1084 do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb) 1085 { 1086 struct mount *mp; 1087 int error; 1088 struct vnode *vp; 1089 1090 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 1091 if (error != 0) 1092 return error; 1093 mp = vp->v_mount; 1094 error = dostatvfs(mp, sb, l, flags, 1); 1095 vrele(vp); 1096 return error; 1097 } 1098 1099 /* ARGSUSED */ 1100 int 1101 sys_statvfs1(struct lwp *l, const struct sys_statvfs1_args *uap, register_t *retval) 1102 { 1103 /* { 1104 syscallarg(const char *) path; 1105 syscallarg(struct statvfs *) buf; 1106 syscallarg(int) flags; 1107 } */ 1108 struct statvfs *sb; 1109 int error; 1110 1111 sb = STATVFSBUF_GET(); 1112 error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb); 1113 if (error == 0) 1114 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1115 STATVFSBUF_PUT(sb); 1116 return error; 1117 } 1118 1119 /* 1120 * Get filesystem statistics by fd. 1121 */ 1122 int 1123 do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb) 1124 { 1125 file_t *fp; 1126 struct mount *mp; 1127 int error; 1128 1129 /* fd_getvnode() will use the descriptor for us */ 1130 if ((error = fd_getvnode(fd, &fp)) != 0) 1131 return (error); 1132 mp = ((struct vnode *)fp->f_data)->v_mount; 1133 error = dostatvfs(mp, sb, curlwp, flags, 1); 1134 fd_putfile(fd); 1135 return error; 1136 } 1137 1138 /* ARGSUSED */ 1139 int 1140 sys_fstatvfs1(struct lwp *l, const struct sys_fstatvfs1_args *uap, register_t *retval) 1141 { 1142 /* { 1143 syscallarg(int) fd; 1144 syscallarg(struct statvfs *) buf; 1145 syscallarg(int) flags; 1146 } */ 1147 struct statvfs *sb; 1148 int error; 1149 1150 sb = STATVFSBUF_GET(); 1151 error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb); 1152 if (error == 0) 1153 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1154 STATVFSBUF_PUT(sb); 1155 return error; 1156 } 1157 1158 1159 /* 1160 * Get statistics on all filesystems. 1161 */ 1162 int 1163 do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags, 1164 int (*copyfn)(const void *, void *, size_t), size_t entry_sz, 1165 register_t *retval) 1166 { 1167 int root = 0; 1168 struct proc *p = l->l_proc; 1169 struct mount *mp, *nmp; 1170 struct statvfs *sb; 1171 size_t count, maxcount; 1172 int error = 0; 1173 1174 sb = STATVFSBUF_GET(); 1175 maxcount = bufsize / entry_sz; 1176 mutex_enter(&mountlist_lock); 1177 count = 0; 1178 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 1179 mp = nmp) { 1180 if (vfs_busy(mp, &nmp)) { 1181 continue; 1182 } 1183 if (sfsp && count < maxcount) { 1184 error = dostatvfs(mp, sb, l, flags, 0); 1185 if (error) { 1186 vfs_unbusy(mp, false, &nmp); 1187 error = 0; 1188 continue; 1189 } 1190 error = copyfn(sb, sfsp, entry_sz); 1191 if (error) { 1192 vfs_unbusy(mp, false, NULL); 1193 goto out; 1194 } 1195 sfsp = (char *)sfsp + entry_sz; 1196 root |= strcmp(sb->f_mntonname, "/") == 0; 1197 } 1198 count++; 1199 vfs_unbusy(mp, false, &nmp); 1200 } 1201 mutex_exit(&mountlist_lock); 1202 1203 if (root == 0 && p->p_cwdi->cwdi_rdir) { 1204 /* 1205 * fake a root entry 1206 */ 1207 error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, 1208 sb, l, flags, 1); 1209 if (error != 0) 1210 goto out; 1211 if (sfsp) { 1212 error = copyfn(sb, sfsp, entry_sz); 1213 if (error != 0) 1214 goto out; 1215 } 1216 count++; 1217 } 1218 if (sfsp && count > maxcount) 1219 *retval = maxcount; 1220 else 1221 *retval = count; 1222 out: 1223 STATVFSBUF_PUT(sb); 1224 return error; 1225 } 1226 1227 int 1228 sys_getvfsstat(struct lwp *l, const struct sys_getvfsstat_args *uap, register_t *retval) 1229 { 1230 /* { 1231 syscallarg(struct statvfs *) buf; 1232 syscallarg(size_t) bufsize; 1233 syscallarg(int) flags; 1234 } */ 1235 1236 return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize), 1237 SCARG(uap, flags), copyout, sizeof (struct statvfs), retval); 1238 } 1239 1240 /* 1241 * Change current working directory to a given file descriptor. 1242 */ 1243 /* ARGSUSED */ 1244 int 1245 sys_fchdir(struct lwp *l, const struct sys_fchdir_args *uap, register_t *retval) 1246 { 1247 /* { 1248 syscallarg(int) fd; 1249 } */ 1250 struct proc *p = l->l_proc; 1251 struct cwdinfo *cwdi; 1252 struct vnode *vp, *tdp; 1253 struct mount *mp; 1254 file_t *fp; 1255 int error, fd; 1256 1257 /* fd_getvnode() will use the descriptor for us */ 1258 fd = SCARG(uap, fd); 1259 if ((error = fd_getvnode(fd, &fp)) != 0) 1260 return (error); 1261 vp = fp->f_data; 1262 1263 vref(vp); 1264 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1265 if (vp->v_type != VDIR) 1266 error = ENOTDIR; 1267 else 1268 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1269 if (error) { 1270 vput(vp); 1271 goto out; 1272 } 1273 while ((mp = vp->v_mountedhere) != NULL) { 1274 error = vfs_busy(mp, NULL); 1275 vput(vp); 1276 if (error != 0) 1277 goto out; 1278 error = VFS_ROOT(mp, &tdp); 1279 vfs_unbusy(mp, false, NULL); 1280 if (error) 1281 goto out; 1282 vp = tdp; 1283 } 1284 VOP_UNLOCK(vp); 1285 1286 /* 1287 * Disallow changing to a directory not under the process's 1288 * current root directory (if there is one). 1289 */ 1290 cwdi = p->p_cwdi; 1291 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1292 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 1293 vrele(vp); 1294 error = EPERM; /* operation not permitted */ 1295 } else { 1296 vrele(cwdi->cwdi_cdir); 1297 cwdi->cwdi_cdir = vp; 1298 } 1299 rw_exit(&cwdi->cwdi_lock); 1300 1301 out: 1302 fd_putfile(fd); 1303 return (error); 1304 } 1305 1306 /* 1307 * Change this process's notion of the root directory to a given file 1308 * descriptor. 1309 */ 1310 int 1311 sys_fchroot(struct lwp *l, const struct sys_fchroot_args *uap, register_t *retval) 1312 { 1313 struct proc *p = l->l_proc; 1314 struct vnode *vp; 1315 file_t *fp; 1316 int error, fd = SCARG(uap, fd); 1317 1318 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1319 KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) 1320 return error; 1321 /* fd_getvnode() will use the descriptor for us */ 1322 if ((error = fd_getvnode(fd, &fp)) != 0) 1323 return error; 1324 vp = fp->f_data; 1325 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1326 if (vp->v_type != VDIR) 1327 error = ENOTDIR; 1328 else 1329 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1330 VOP_UNLOCK(vp); 1331 if (error) 1332 goto out; 1333 vref(vp); 1334 1335 change_root(p->p_cwdi, vp, l); 1336 1337 out: 1338 fd_putfile(fd); 1339 return (error); 1340 } 1341 1342 /* 1343 * Change current working directory (``.''). 1344 */ 1345 /* ARGSUSED */ 1346 int 1347 sys_chdir(struct lwp *l, const struct sys_chdir_args *uap, register_t *retval) 1348 { 1349 /* { 1350 syscallarg(const char *) path; 1351 } */ 1352 struct proc *p = l->l_proc; 1353 struct cwdinfo *cwdi; 1354 int error; 1355 struct vnode *vp; 1356 1357 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1358 &vp, l)) != 0) 1359 return (error); 1360 cwdi = p->p_cwdi; 1361 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1362 vrele(cwdi->cwdi_cdir); 1363 cwdi->cwdi_cdir = vp; 1364 rw_exit(&cwdi->cwdi_lock); 1365 return (0); 1366 } 1367 1368 /* 1369 * Change notion of root (``/'') directory. 1370 */ 1371 /* ARGSUSED */ 1372 int 1373 sys_chroot(struct lwp *l, const struct sys_chroot_args *uap, register_t *retval) 1374 { 1375 /* { 1376 syscallarg(const char *) path; 1377 } */ 1378 struct proc *p = l->l_proc; 1379 int error; 1380 struct vnode *vp; 1381 1382 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1383 KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) 1384 return (error); 1385 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1386 &vp, l)) != 0) 1387 return (error); 1388 1389 change_root(p->p_cwdi, vp, l); 1390 1391 return (0); 1392 } 1393 1394 /* 1395 * Common routine for chroot and fchroot. 1396 * NB: callers need to properly authorize the change root operation. 1397 */ 1398 void 1399 change_root(struct cwdinfo *cwdi, struct vnode *vp, struct lwp *l) 1400 { 1401 struct proc *p = l->l_proc; 1402 kauth_cred_t ncred; 1403 1404 ncred = kauth_cred_alloc(); 1405 1406 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1407 if (cwdi->cwdi_rdir != NULL) 1408 vrele(cwdi->cwdi_rdir); 1409 cwdi->cwdi_rdir = vp; 1410 1411 /* 1412 * Prevent escaping from chroot by putting the root under 1413 * the working directory. Silently chdir to / if we aren't 1414 * already there. 1415 */ 1416 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1417 /* 1418 * XXX would be more failsafe to change directory to a 1419 * deadfs node here instead 1420 */ 1421 vrele(cwdi->cwdi_cdir); 1422 vref(vp); 1423 cwdi->cwdi_cdir = vp; 1424 } 1425 rw_exit(&cwdi->cwdi_lock); 1426 1427 /* Get a write lock on the process credential. */ 1428 proc_crmod_enter(); 1429 1430 kauth_cred_clone(p->p_cred, ncred); 1431 kauth_proc_chroot(ncred, p->p_cwdi); 1432 1433 /* Broadcast our credentials to the process and other LWPs. */ 1434 proc_crmod_leave(ncred, p->p_cred, true); 1435 } 1436 1437 /* 1438 * Common routine for chroot and chdir. 1439 * XXX "where" should be enum uio_seg 1440 */ 1441 int 1442 chdir_lookup(const char *path, int where, struct vnode **vpp, struct lwp *l) 1443 { 1444 struct pathbuf *pb; 1445 struct nameidata nd; 1446 int error; 1447 1448 error = pathbuf_maybe_copyin(path, where, &pb); 1449 if (error) { 1450 return error; 1451 } 1452 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1453 if ((error = namei(&nd)) != 0) { 1454 pathbuf_destroy(pb); 1455 return error; 1456 } 1457 *vpp = nd.ni_vp; 1458 pathbuf_destroy(pb); 1459 1460 if ((*vpp)->v_type != VDIR) 1461 error = ENOTDIR; 1462 else 1463 error = VOP_ACCESS(*vpp, VEXEC, l->l_cred); 1464 1465 if (error) 1466 vput(*vpp); 1467 else 1468 VOP_UNLOCK(*vpp); 1469 return (error); 1470 } 1471 1472 /* 1473 * Internals of sys_open - path has already been converted into a pathbuf 1474 * (so we can easily reuse this function from other parts of the kernel, 1475 * like posix_spawn post-processing). 1476 */ 1477 static int 1478 do_open(lwp_t *l, struct pathbuf *pb, int open_flags, int open_mode, int *fd) 1479 { 1480 struct proc *p = l->l_proc; 1481 struct cwdinfo *cwdi = p->p_cwdi; 1482 file_t *fp; 1483 struct vnode *vp; 1484 int flags, cmode; 1485 int indx, error; 1486 struct nameidata nd; 1487 1488 flags = FFLAGS(open_flags); 1489 if ((flags & (FREAD | FWRITE)) == 0) 1490 return EINVAL; 1491 1492 if ((error = fd_allocfile(&fp, &indx)) != 0) { 1493 return error; 1494 } 1495 1496 /* We're going to read cwdi->cwdi_cmask unlocked here. */ 1497 cmode = ((open_mode &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1498 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, pb); 1499 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1500 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1501 fd_abort(p, fp, indx); 1502 if ((error == EDUPFD || error == EMOVEFD) && 1503 l->l_dupfd >= 0 && /* XXX from fdopen */ 1504 (error = 1505 fd_dupopen(l->l_dupfd, &indx, flags, error)) == 0) { 1506 *fd = indx; 1507 return 0; 1508 } 1509 if (error == ERESTART) 1510 error = EINTR; 1511 return error; 1512 } 1513 1514 l->l_dupfd = 0; 1515 vp = nd.ni_vp; 1516 1517 if ((error = open_setfp(l, fp, vp, indx, flags))) 1518 return error; 1519 1520 VOP_UNLOCK(vp); 1521 *fd = indx; 1522 fd_affix(p, fp, indx); 1523 return 0; 1524 } 1525 1526 int 1527 fd_open(const char *path, int open_flags, int open_mode, int *fd) 1528 { 1529 struct pathbuf *pb; 1530 int error, oflags; 1531 1532 oflags = FFLAGS(open_flags); 1533 if ((oflags & (FREAD | FWRITE)) == 0) 1534 return EINVAL; 1535 1536 pb = pathbuf_create(path); 1537 if (pb == NULL) 1538 return ENOMEM; 1539 1540 error = do_open(curlwp, pb, open_flags, open_mode, fd); 1541 pathbuf_destroy(pb); 1542 1543 return error; 1544 } 1545 1546 /* 1547 * Check permissions, allocate an open file structure, 1548 * and call the device open routine if any. 1549 */ 1550 int 1551 sys_open(struct lwp *l, const struct sys_open_args *uap, register_t *retval) 1552 { 1553 /* { 1554 syscallarg(const char *) path; 1555 syscallarg(int) flags; 1556 syscallarg(int) mode; 1557 } */ 1558 struct pathbuf *pb; 1559 int result, flags, error; 1560 1561 flags = FFLAGS(SCARG(uap, flags)); 1562 if ((flags & (FREAD | FWRITE)) == 0) 1563 return EINVAL; 1564 1565 error = pathbuf_copyin(SCARG(uap, path), &pb); 1566 if (error) 1567 return error; 1568 1569 error = do_open(l, pb, SCARG(uap, flags), SCARG(uap, mode), &result); 1570 pathbuf_destroy(pb); 1571 1572 *retval = result; 1573 return error; 1574 } 1575 1576 int 1577 sys_openat(struct lwp *l, const struct sys_openat_args *uap, register_t *retval) 1578 { 1579 /* { 1580 syscallarg(int) fd; 1581 syscallarg(const char *) path; 1582 syscallarg(int) flags; 1583 syscallarg(int) mode; 1584 } */ 1585 1586 return ENOSYS; 1587 } 1588 1589 static void 1590 vfs__fhfree(fhandle_t *fhp) 1591 { 1592 size_t fhsize; 1593 1594 if (fhp == NULL) { 1595 return; 1596 } 1597 fhsize = FHANDLE_SIZE(fhp); 1598 kmem_free(fhp, fhsize); 1599 } 1600 1601 /* 1602 * vfs_composefh: compose a filehandle. 1603 */ 1604 1605 int 1606 vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) 1607 { 1608 struct mount *mp; 1609 struct fid *fidp; 1610 int error; 1611 size_t needfhsize; 1612 size_t fidsize; 1613 1614 mp = vp->v_mount; 1615 fidp = NULL; 1616 if (*fh_size < FHANDLE_SIZE_MIN) { 1617 fidsize = 0; 1618 } else { 1619 fidsize = *fh_size - offsetof(fhandle_t, fh_fid); 1620 if (fhp != NULL) { 1621 memset(fhp, 0, *fh_size); 1622 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1623 fidp = &fhp->fh_fid; 1624 } 1625 } 1626 error = VFS_VPTOFH(vp, fidp, &fidsize); 1627 needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1628 if (error == 0 && *fh_size < needfhsize) { 1629 error = E2BIG; 1630 } 1631 *fh_size = needfhsize; 1632 return error; 1633 } 1634 1635 int 1636 vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) 1637 { 1638 struct mount *mp; 1639 fhandle_t *fhp; 1640 size_t fhsize; 1641 size_t fidsize; 1642 int error; 1643 1644 *fhpp = NULL; 1645 mp = vp->v_mount; 1646 fidsize = 0; 1647 error = VFS_VPTOFH(vp, NULL, &fidsize); 1648 KASSERT(error != 0); 1649 if (error != E2BIG) { 1650 goto out; 1651 } 1652 fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1653 fhp = kmem_zalloc(fhsize, KM_SLEEP); 1654 if (fhp == NULL) { 1655 error = ENOMEM; 1656 goto out; 1657 } 1658 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1659 error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); 1660 if (error == 0) { 1661 KASSERT((FHANDLE_SIZE(fhp) == fhsize && 1662 FHANDLE_FILEID(fhp)->fid_len == fidsize)); 1663 *fhpp = fhp; 1664 } else { 1665 kmem_free(fhp, fhsize); 1666 } 1667 out: 1668 return error; 1669 } 1670 1671 void 1672 vfs_composefh_free(fhandle_t *fhp) 1673 { 1674 1675 vfs__fhfree(fhp); 1676 } 1677 1678 /* 1679 * vfs_fhtovp: lookup a vnode by a filehandle. 1680 */ 1681 1682 int 1683 vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) 1684 { 1685 struct mount *mp; 1686 int error; 1687 1688 *vpp = NULL; 1689 mp = vfs_getvfs(FHANDLE_FSID(fhp)); 1690 if (mp == NULL) { 1691 error = ESTALE; 1692 goto out; 1693 } 1694 if (mp->mnt_op->vfs_fhtovp == NULL) { 1695 error = EOPNOTSUPP; 1696 goto out; 1697 } 1698 error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp); 1699 out: 1700 return error; 1701 } 1702 1703 /* 1704 * vfs_copyinfh_alloc: allocate and copyin a filehandle, given 1705 * the needed size. 1706 */ 1707 1708 int 1709 vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) 1710 { 1711 fhandle_t *fhp; 1712 int error; 1713 1714 *fhpp = NULL; 1715 if (fhsize > FHANDLE_SIZE_MAX) { 1716 return EINVAL; 1717 } 1718 if (fhsize < FHANDLE_SIZE_MIN) { 1719 return EINVAL; 1720 } 1721 again: 1722 fhp = kmem_alloc(fhsize, KM_SLEEP); 1723 if (fhp == NULL) { 1724 return ENOMEM; 1725 } 1726 error = copyin(ufhp, fhp, fhsize); 1727 if (error == 0) { 1728 /* XXX this check shouldn't be here */ 1729 if (FHANDLE_SIZE(fhp) == fhsize) { 1730 *fhpp = fhp; 1731 return 0; 1732 } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { 1733 /* 1734 * a kludge for nfsv2 padded handles. 1735 */ 1736 size_t sz; 1737 1738 sz = FHANDLE_SIZE(fhp); 1739 kmem_free(fhp, fhsize); 1740 fhsize = sz; 1741 goto again; 1742 } else { 1743 /* 1744 * userland told us wrong size. 1745 */ 1746 error = EINVAL; 1747 } 1748 } 1749 kmem_free(fhp, fhsize); 1750 return error; 1751 } 1752 1753 void 1754 vfs_copyinfh_free(fhandle_t *fhp) 1755 { 1756 1757 vfs__fhfree(fhp); 1758 } 1759 1760 /* 1761 * Get file handle system call 1762 */ 1763 int 1764 sys___getfh30(struct lwp *l, const struct sys___getfh30_args *uap, register_t *retval) 1765 { 1766 /* { 1767 syscallarg(char *) fname; 1768 syscallarg(fhandle_t *) fhp; 1769 syscallarg(size_t *) fh_size; 1770 } */ 1771 struct vnode *vp; 1772 fhandle_t *fh; 1773 int error; 1774 struct pathbuf *pb; 1775 struct nameidata nd; 1776 size_t sz; 1777 size_t usz; 1778 1779 /* 1780 * Must be super user 1781 */ 1782 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1783 0, NULL, NULL, NULL); 1784 if (error) 1785 return (error); 1786 1787 error = pathbuf_copyin(SCARG(uap, fname), &pb); 1788 if (error) { 1789 return error; 1790 } 1791 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1792 error = namei(&nd); 1793 if (error) { 1794 pathbuf_destroy(pb); 1795 return error; 1796 } 1797 vp = nd.ni_vp; 1798 pathbuf_destroy(pb); 1799 1800 error = vfs_composefh_alloc(vp, &fh); 1801 vput(vp); 1802 if (error != 0) { 1803 goto out; 1804 } 1805 error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); 1806 if (error != 0) { 1807 goto out; 1808 } 1809 sz = FHANDLE_SIZE(fh); 1810 error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); 1811 if (error != 0) { 1812 goto out; 1813 } 1814 if (usz >= sz) { 1815 error = copyout(fh, SCARG(uap, fhp), sz); 1816 } else { 1817 error = E2BIG; 1818 } 1819 out: 1820 vfs_composefh_free(fh); 1821 return (error); 1822 } 1823 1824 /* 1825 * Open a file given a file handle. 1826 * 1827 * Check permissions, allocate an open file structure, 1828 * and call the device open routine if any. 1829 */ 1830 1831 int 1832 dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, 1833 register_t *retval) 1834 { 1835 file_t *fp; 1836 struct vnode *vp = NULL; 1837 kauth_cred_t cred = l->l_cred; 1838 file_t *nfp; 1839 int indx, error = 0; 1840 struct vattr va; 1841 fhandle_t *fh; 1842 int flags; 1843 proc_t *p; 1844 1845 p = curproc; 1846 1847 /* 1848 * Must be super user 1849 */ 1850 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1851 0, NULL, NULL, NULL))) 1852 return (error); 1853 1854 flags = FFLAGS(oflags); 1855 if ((flags & (FREAD | FWRITE)) == 0) 1856 return (EINVAL); 1857 if ((flags & O_CREAT)) 1858 return (EINVAL); 1859 if ((error = fd_allocfile(&nfp, &indx)) != 0) 1860 return (error); 1861 fp = nfp; 1862 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1863 if (error != 0) { 1864 goto bad; 1865 } 1866 error = vfs_fhtovp(fh, &vp); 1867 if (error != 0) { 1868 goto bad; 1869 } 1870 1871 /* Now do an effective vn_open */ 1872 1873 if (vp->v_type == VSOCK) { 1874 error = EOPNOTSUPP; 1875 goto bad; 1876 } 1877 error = vn_openchk(vp, cred, flags); 1878 if (error != 0) 1879 goto bad; 1880 if (flags & O_TRUNC) { 1881 VOP_UNLOCK(vp); /* XXX */ 1882 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1883 vattr_null(&va); 1884 va.va_size = 0; 1885 error = VOP_SETATTR(vp, &va, cred); 1886 if (error) 1887 goto bad; 1888 } 1889 if ((error = VOP_OPEN(vp, flags, cred)) != 0) 1890 goto bad; 1891 if (flags & FWRITE) { 1892 mutex_enter(vp->v_interlock); 1893 vp->v_writecount++; 1894 mutex_exit(vp->v_interlock); 1895 } 1896 1897 /* done with modified vn_open, now finish what sys_open does. */ 1898 if ((error = open_setfp(l, fp, vp, indx, flags))) 1899 return error; 1900 1901 VOP_UNLOCK(vp); 1902 *retval = indx; 1903 fd_affix(p, fp, indx); 1904 vfs_copyinfh_free(fh); 1905 return (0); 1906 1907 bad: 1908 fd_abort(p, fp, indx); 1909 if (vp != NULL) 1910 vput(vp); 1911 vfs_copyinfh_free(fh); 1912 return (error); 1913 } 1914 1915 int 1916 sys___fhopen40(struct lwp *l, const struct sys___fhopen40_args *uap, register_t *retval) 1917 { 1918 /* { 1919 syscallarg(const void *) fhp; 1920 syscallarg(size_t) fh_size; 1921 syscallarg(int) flags; 1922 } */ 1923 1924 return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), 1925 SCARG(uap, flags), retval); 1926 } 1927 1928 int 1929 do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb) 1930 { 1931 int error; 1932 fhandle_t *fh; 1933 struct vnode *vp; 1934 1935 /* 1936 * Must be super user 1937 */ 1938 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1939 0, NULL, NULL, NULL))) 1940 return (error); 1941 1942 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1943 if (error != 0) 1944 return error; 1945 1946 error = vfs_fhtovp(fh, &vp); 1947 vfs_copyinfh_free(fh); 1948 if (error != 0) 1949 return error; 1950 1951 error = vn_stat(vp, sb); 1952 vput(vp); 1953 return error; 1954 } 1955 1956 1957 /* ARGSUSED */ 1958 int 1959 sys___fhstat50(struct lwp *l, const struct sys___fhstat50_args *uap, register_t *retval) 1960 { 1961 /* { 1962 syscallarg(const void *) fhp; 1963 syscallarg(size_t) fh_size; 1964 syscallarg(struct stat *) sb; 1965 } */ 1966 struct stat sb; 1967 int error; 1968 1969 error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb); 1970 if (error) 1971 return error; 1972 return copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1973 } 1974 1975 int 1976 do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb, 1977 int flags) 1978 { 1979 fhandle_t *fh; 1980 struct mount *mp; 1981 struct vnode *vp; 1982 int error; 1983 1984 /* 1985 * Must be super user 1986 */ 1987 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1988 0, NULL, NULL, NULL))) 1989 return error; 1990 1991 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1992 if (error != 0) 1993 return error; 1994 1995 error = vfs_fhtovp(fh, &vp); 1996 vfs_copyinfh_free(fh); 1997 if (error != 0) 1998 return error; 1999 2000 mp = vp->v_mount; 2001 error = dostatvfs(mp, sb, l, flags, 1); 2002 vput(vp); 2003 return error; 2004 } 2005 2006 /* ARGSUSED */ 2007 int 2008 sys___fhstatvfs140(struct lwp *l, const struct sys___fhstatvfs140_args *uap, register_t *retval) 2009 { 2010 /* { 2011 syscallarg(const void *) fhp; 2012 syscallarg(size_t) fh_size; 2013 syscallarg(struct statvfs *) buf; 2014 syscallarg(int) flags; 2015 } */ 2016 struct statvfs *sb = STATVFSBUF_GET(); 2017 int error; 2018 2019 error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb, 2020 SCARG(uap, flags)); 2021 if (error == 0) 2022 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 2023 STATVFSBUF_PUT(sb); 2024 return error; 2025 } 2026 2027 /* 2028 * Create a special file. 2029 */ 2030 /* ARGSUSED */ 2031 int 2032 sys___mknod50(struct lwp *l, const struct sys___mknod50_args *uap, 2033 register_t *retval) 2034 { 2035 /* { 2036 syscallarg(const char *) path; 2037 syscallarg(mode_t) mode; 2038 syscallarg(dev_t) dev; 2039 } */ 2040 return do_sys_mknod(l, SCARG(uap, path), SCARG(uap, mode), 2041 SCARG(uap, dev), retval, UIO_USERSPACE); 2042 } 2043 2044 int 2045 sys_mknodat(struct lwp *l, const struct sys_mknodat_args *uap, 2046 register_t *retval) 2047 { 2048 /* { 2049 syscallarg(int) fd; 2050 syscallarg(const char *) path; 2051 syscallarg(mode_t) mode; 2052 syscallarg(uint32_t) dev; 2053 } */ 2054 2055 return ENOSYS; 2056 } 2057 2058 int 2059 do_sys_mknod(struct lwp *l, const char *pathname, mode_t mode, dev_t dev, 2060 register_t *retval, enum uio_seg seg) 2061 { 2062 struct proc *p = l->l_proc; 2063 struct vnode *vp; 2064 struct vattr vattr; 2065 int error, optype; 2066 struct pathbuf *pb; 2067 struct nameidata nd; 2068 const char *pathstring; 2069 2070 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 2071 0, NULL, NULL, NULL)) != 0) 2072 return (error); 2073 2074 optype = VOP_MKNOD_DESCOFFSET; 2075 2076 error = pathbuf_maybe_copyin(pathname, seg, &pb); 2077 if (error) { 2078 return error; 2079 } 2080 pathstring = pathbuf_stringcopy_get(pb); 2081 if (pathstring == NULL) { 2082 pathbuf_destroy(pb); 2083 return ENOMEM; 2084 } 2085 2086 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2087 if ((error = namei(&nd)) != 0) 2088 goto out; 2089 vp = nd.ni_vp; 2090 2091 if (vp != NULL) 2092 error = EEXIST; 2093 else { 2094 vattr_null(&vattr); 2095 /* We will read cwdi->cwdi_cmask unlocked. */ 2096 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2097 vattr.va_rdev = dev; 2098 2099 switch (mode & S_IFMT) { 2100 case S_IFMT: /* used by badsect to flag bad sectors */ 2101 vattr.va_type = VBAD; 2102 break; 2103 case S_IFCHR: 2104 vattr.va_type = VCHR; 2105 break; 2106 case S_IFBLK: 2107 vattr.va_type = VBLK; 2108 break; 2109 case S_IFWHT: 2110 optype = VOP_WHITEOUT_DESCOFFSET; 2111 break; 2112 case S_IFREG: 2113 #if NVERIEXEC > 0 2114 error = veriexec_openchk(l, nd.ni_vp, pathstring, 2115 O_CREAT); 2116 #endif /* NVERIEXEC > 0 */ 2117 vattr.va_type = VREG; 2118 vattr.va_rdev = VNOVAL; 2119 optype = VOP_CREATE_DESCOFFSET; 2120 break; 2121 default: 2122 error = EINVAL; 2123 break; 2124 } 2125 } 2126 if (error == 0 && optype == VOP_MKNOD_DESCOFFSET 2127 && vattr.va_rdev == VNOVAL) 2128 error = EINVAL; 2129 if (!error) { 2130 switch (optype) { 2131 case VOP_WHITEOUT_DESCOFFSET: 2132 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 2133 if (error) 2134 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2135 vput(nd.ni_dvp); 2136 break; 2137 2138 case VOP_MKNOD_DESCOFFSET: 2139 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 2140 &nd.ni_cnd, &vattr); 2141 if (error == 0) 2142 vput(nd.ni_vp); 2143 break; 2144 2145 case VOP_CREATE_DESCOFFSET: 2146 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, 2147 &nd.ni_cnd, &vattr); 2148 if (error == 0) 2149 vput(nd.ni_vp); 2150 break; 2151 } 2152 } else { 2153 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2154 if (nd.ni_dvp == vp) 2155 vrele(nd.ni_dvp); 2156 else 2157 vput(nd.ni_dvp); 2158 if (vp) 2159 vrele(vp); 2160 } 2161 out: 2162 pathbuf_stringcopy_put(pb, pathstring); 2163 pathbuf_destroy(pb); 2164 return (error); 2165 } 2166 2167 /* 2168 * Create a named pipe. 2169 */ 2170 /* ARGSUSED */ 2171 int 2172 sys_mkfifo(struct lwp *l, const struct sys_mkfifo_args *uap, register_t *retval) 2173 { 2174 /* { 2175 syscallarg(const char *) path; 2176 syscallarg(int) mode; 2177 } */ 2178 struct proc *p = l->l_proc; 2179 struct vattr vattr; 2180 int error; 2181 struct pathbuf *pb; 2182 struct nameidata nd; 2183 2184 error = pathbuf_copyin(SCARG(uap, path), &pb); 2185 if (error) { 2186 return error; 2187 } 2188 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2189 if ((error = namei(&nd)) != 0) { 2190 pathbuf_destroy(pb); 2191 return error; 2192 } 2193 if (nd.ni_vp != NULL) { 2194 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2195 if (nd.ni_dvp == nd.ni_vp) 2196 vrele(nd.ni_dvp); 2197 else 2198 vput(nd.ni_dvp); 2199 vrele(nd.ni_vp); 2200 pathbuf_destroy(pb); 2201 return (EEXIST); 2202 } 2203 vattr_null(&vattr); 2204 vattr.va_type = VFIFO; 2205 /* We will read cwdi->cwdi_cmask unlocked. */ 2206 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2207 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2208 if (error == 0) 2209 vput(nd.ni_vp); 2210 pathbuf_destroy(pb); 2211 return (error); 2212 } 2213 2214 int 2215 sys_mkfifoat(struct lwp *l, const struct sys_mkfifoat_args *uap, 2216 register_t *retval) 2217 { 2218 /* { 2219 syscallarg(int) fd; 2220 syscallarg(const char *) path; 2221 syscallarg(int) mode; 2222 } */ 2223 2224 return ENOSYS; 2225 } 2226 /* 2227 * Make a hard file link. 2228 */ 2229 /* ARGSUSED */ 2230 static int 2231 do_sys_link(struct lwp *l, const char *path, const char *link, 2232 int follow, register_t *retval) 2233 { 2234 struct vnode *vp; 2235 struct pathbuf *linkpb; 2236 struct nameidata nd; 2237 namei_simple_flags_t namei_simple_flags; 2238 int error; 2239 2240 if (follow) 2241 namei_simple_flags = NSM_FOLLOW_TRYEMULROOT; 2242 else 2243 namei_simple_flags = NSM_NOFOLLOW_TRYEMULROOT; 2244 2245 error = namei_simple_user(path, namei_simple_flags, &vp); 2246 if (error != 0) 2247 return (error); 2248 error = pathbuf_copyin(link, &linkpb); 2249 if (error) { 2250 goto out1; 2251 } 2252 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2253 if ((error = namei(&nd)) != 0) 2254 goto out2; 2255 if (nd.ni_vp) { 2256 error = EEXIST; 2257 goto abortop; 2258 } 2259 /* Prevent hard links on directories. */ 2260 if (vp->v_type == VDIR) { 2261 error = EPERM; 2262 goto abortop; 2263 } 2264 /* Prevent cross-mount operation. */ 2265 if (nd.ni_dvp->v_mount != vp->v_mount) { 2266 error = EXDEV; 2267 goto abortop; 2268 } 2269 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 2270 out2: 2271 pathbuf_destroy(linkpb); 2272 out1: 2273 vrele(vp); 2274 return (error); 2275 abortop: 2276 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2277 if (nd.ni_dvp == nd.ni_vp) 2278 vrele(nd.ni_dvp); 2279 else 2280 vput(nd.ni_dvp); 2281 if (nd.ni_vp != NULL) 2282 vrele(nd.ni_vp); 2283 goto out2; 2284 } 2285 2286 int 2287 sys_link(struct lwp *l, const struct sys_link_args *uap, register_t *retval) 2288 { 2289 /* { 2290 syscallarg(const char *) path; 2291 syscallarg(const char *) link; 2292 } */ 2293 const char *path = SCARG(uap, path); 2294 const char *link = SCARG(uap, link); 2295 2296 return do_sys_link(l, path, link, 1, retval); 2297 } 2298 2299 int 2300 sys_linkat(struct lwp *l, const struct sys_linkat_args *uap, 2301 register_t *retval) 2302 { 2303 /* { 2304 syscallarg(int) fd1; 2305 syscallarg(const char *) name1; 2306 syscallarg(int) fd2; 2307 syscallarg(const char *) name2; 2308 syscallarg(int) flags; 2309 } */ 2310 const char *name1 = SCARG(uap, name1); 2311 const char *name2 = SCARG(uap, name2); 2312 int follow; 2313 2314 /* 2315 * Specified fd1 and fd2 are not yet implemented 2316 */ 2317 if ((SCARG(uap, fd1) != AT_FDCWD) || (SCARG(uap, fd2) != AT_FDCWD)) 2318 return ENOSYS; 2319 2320 follow = SCARG(uap, flags) & AT_SYMLINK_FOLLOW; 2321 2322 return do_sys_link(l, name1, name2, follow, retval); 2323 } 2324 2325 2326 int 2327 do_sys_symlink(const char *patharg, const char *link, enum uio_seg seg) 2328 { 2329 struct proc *p = curproc; 2330 struct vattr vattr; 2331 char *path; 2332 int error; 2333 struct pathbuf *linkpb; 2334 struct nameidata nd; 2335 2336 path = PNBUF_GET(); 2337 if (seg == UIO_USERSPACE) { 2338 if ((error = copyinstr(patharg, path, MAXPATHLEN, NULL)) != 0) 2339 goto out1; 2340 if ((error = pathbuf_copyin(link, &linkpb)) != 0) 2341 goto out1; 2342 } else { 2343 KASSERT(strlen(patharg) < MAXPATHLEN); 2344 strcpy(path, patharg); 2345 linkpb = pathbuf_create(link); 2346 if (linkpb == NULL) { 2347 error = ENOMEM; 2348 goto out1; 2349 } 2350 } 2351 ktrkuser("symlink-target", path, strlen(path)); 2352 2353 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2354 if ((error = namei(&nd)) != 0) 2355 goto out2; 2356 if (nd.ni_vp) { 2357 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2358 if (nd.ni_dvp == nd.ni_vp) 2359 vrele(nd.ni_dvp); 2360 else 2361 vput(nd.ni_dvp); 2362 vrele(nd.ni_vp); 2363 error = EEXIST; 2364 goto out2; 2365 } 2366 vattr_null(&vattr); 2367 vattr.va_type = VLNK; 2368 /* We will read cwdi->cwdi_cmask unlocked. */ 2369 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 2370 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 2371 if (error == 0) 2372 vput(nd.ni_vp); 2373 out2: 2374 pathbuf_destroy(linkpb); 2375 out1: 2376 PNBUF_PUT(path); 2377 return (error); 2378 } 2379 2380 /* 2381 * Make a symbolic link. 2382 */ 2383 /* ARGSUSED */ 2384 int 2385 sys_symlink(struct lwp *l, const struct sys_symlink_args *uap, register_t *retval) 2386 { 2387 /* { 2388 syscallarg(const char *) path; 2389 syscallarg(const char *) link; 2390 } */ 2391 2392 return do_sys_symlink(SCARG(uap, path), SCARG(uap, link), 2393 UIO_USERSPACE); 2394 } 2395 2396 int 2397 sys_symlinkat(struct lwp *l, const struct sys_symlinkat_args *uap, 2398 register_t *retval) 2399 { 2400 /* { 2401 syscallarg(int) fd; 2402 syscallarg(const char *) path; 2403 syscallarg(const char *) link; 2404 } */ 2405 2406 return ENOSYS; 2407 } 2408 2409 /* 2410 * Delete a whiteout from the filesystem. 2411 */ 2412 /* ARGSUSED */ 2413 int 2414 sys_undelete(struct lwp *l, const struct sys_undelete_args *uap, register_t *retval) 2415 { 2416 /* { 2417 syscallarg(const char *) path; 2418 } */ 2419 int error; 2420 struct pathbuf *pb; 2421 struct nameidata nd; 2422 2423 error = pathbuf_copyin(SCARG(uap, path), &pb); 2424 if (error) { 2425 return error; 2426 } 2427 2428 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT, pb); 2429 error = namei(&nd); 2430 if (error) { 2431 pathbuf_destroy(pb); 2432 return (error); 2433 } 2434 2435 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 2436 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2437 if (nd.ni_dvp == nd.ni_vp) 2438 vrele(nd.ni_dvp); 2439 else 2440 vput(nd.ni_dvp); 2441 if (nd.ni_vp) 2442 vrele(nd.ni_vp); 2443 pathbuf_destroy(pb); 2444 return (EEXIST); 2445 } 2446 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 2447 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2448 vput(nd.ni_dvp); 2449 pathbuf_destroy(pb); 2450 return (error); 2451 } 2452 2453 /* 2454 * Delete a name from the filesystem. 2455 */ 2456 /* ARGSUSED */ 2457 int 2458 sys_unlink(struct lwp *l, const struct sys_unlink_args *uap, register_t *retval) 2459 { 2460 /* { 2461 syscallarg(const char *) path; 2462 } */ 2463 2464 return do_sys_unlink(SCARG(uap, path), UIO_USERSPACE); 2465 } 2466 2467 int 2468 sys_unlinkat(struct lwp *l, const struct sys_unlinkat_args *uap, 2469 register_t *retval) 2470 { 2471 /* { 2472 syscallarg(int) fd; 2473 syscallarg(const char *) path; 2474 } */ 2475 2476 return ENOSYS; 2477 } 2478 2479 int 2480 do_sys_unlink(const char *arg, enum uio_seg seg) 2481 { 2482 struct vnode *vp; 2483 int error; 2484 struct pathbuf *pb; 2485 struct nameidata nd; 2486 const char *pathstring; 2487 2488 error = pathbuf_maybe_copyin(arg, seg, &pb); 2489 if (error) { 2490 return error; 2491 } 2492 pathstring = pathbuf_stringcopy_get(pb); 2493 if (pathstring == NULL) { 2494 pathbuf_destroy(pb); 2495 return ENOMEM; 2496 } 2497 2498 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, pb); 2499 if ((error = namei(&nd)) != 0) 2500 goto out; 2501 vp = nd.ni_vp; 2502 2503 /* 2504 * The root of a mounted filesystem cannot be deleted. 2505 */ 2506 if (vp->v_vflag & VV_ROOT) { 2507 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2508 if (nd.ni_dvp == vp) 2509 vrele(nd.ni_dvp); 2510 else 2511 vput(nd.ni_dvp); 2512 vput(vp); 2513 error = EBUSY; 2514 goto out; 2515 } 2516 2517 #if NVERIEXEC > 0 2518 /* Handle remove requests for veriexec entries. */ 2519 if ((error = veriexec_removechk(curlwp, nd.ni_vp, pathstring)) != 0) { 2520 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2521 if (nd.ni_dvp == vp) 2522 vrele(nd.ni_dvp); 2523 else 2524 vput(nd.ni_dvp); 2525 vput(vp); 2526 goto out; 2527 } 2528 #endif /* NVERIEXEC > 0 */ 2529 2530 #ifdef FILEASSOC 2531 (void)fileassoc_file_delete(vp); 2532 #endif /* FILEASSOC */ 2533 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2534 out: 2535 pathbuf_stringcopy_put(pb, pathstring); 2536 pathbuf_destroy(pb); 2537 return (error); 2538 } 2539 2540 /* 2541 * Reposition read/write file offset. 2542 */ 2543 int 2544 sys_lseek(struct lwp *l, const struct sys_lseek_args *uap, register_t *retval) 2545 { 2546 /* { 2547 syscallarg(int) fd; 2548 syscallarg(int) pad; 2549 syscallarg(off_t) offset; 2550 syscallarg(int) whence; 2551 } */ 2552 kauth_cred_t cred = l->l_cred; 2553 file_t *fp; 2554 struct vnode *vp; 2555 struct vattr vattr; 2556 off_t newoff; 2557 int error, fd; 2558 2559 fd = SCARG(uap, fd); 2560 2561 if ((fp = fd_getfile(fd)) == NULL) 2562 return (EBADF); 2563 2564 vp = fp->f_data; 2565 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2566 error = ESPIPE; 2567 goto out; 2568 } 2569 2570 switch (SCARG(uap, whence)) { 2571 case SEEK_CUR: 2572 newoff = fp->f_offset + SCARG(uap, offset); 2573 break; 2574 case SEEK_END: 2575 vn_lock(vp, LK_SHARED | LK_RETRY); 2576 error = VOP_GETATTR(vp, &vattr, cred); 2577 VOP_UNLOCK(vp); 2578 if (error) { 2579 goto out; 2580 } 2581 newoff = SCARG(uap, offset) + vattr.va_size; 2582 break; 2583 case SEEK_SET: 2584 newoff = SCARG(uap, offset); 2585 break; 2586 default: 2587 error = EINVAL; 2588 goto out; 2589 } 2590 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) == 0) { 2591 *(off_t *)retval = fp->f_offset = newoff; 2592 } 2593 out: 2594 fd_putfile(fd); 2595 return (error); 2596 } 2597 2598 /* 2599 * Positional read system call. 2600 */ 2601 int 2602 sys_pread(struct lwp *l, const struct sys_pread_args *uap, register_t *retval) 2603 { 2604 /* { 2605 syscallarg(int) fd; 2606 syscallarg(void *) buf; 2607 syscallarg(size_t) nbyte; 2608 syscallarg(off_t) offset; 2609 } */ 2610 file_t *fp; 2611 struct vnode *vp; 2612 off_t offset; 2613 int error, fd = SCARG(uap, fd); 2614 2615 if ((fp = fd_getfile(fd)) == NULL) 2616 return (EBADF); 2617 2618 if ((fp->f_flag & FREAD) == 0) { 2619 fd_putfile(fd); 2620 return (EBADF); 2621 } 2622 2623 vp = fp->f_data; 2624 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2625 error = ESPIPE; 2626 goto out; 2627 } 2628 2629 offset = SCARG(uap, offset); 2630 2631 /* 2632 * XXX This works because no file systems actually 2633 * XXX take any action on the seek operation. 2634 */ 2635 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2636 goto out; 2637 2638 /* dofileread() will unuse the descriptor for us */ 2639 return (dofileread(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2640 &offset, 0, retval)); 2641 2642 out: 2643 fd_putfile(fd); 2644 return (error); 2645 } 2646 2647 /* 2648 * Positional scatter read system call. 2649 */ 2650 int 2651 sys_preadv(struct lwp *l, const struct sys_preadv_args *uap, register_t *retval) 2652 { 2653 /* { 2654 syscallarg(int) fd; 2655 syscallarg(const struct iovec *) iovp; 2656 syscallarg(int) iovcnt; 2657 syscallarg(off_t) offset; 2658 } */ 2659 off_t offset = SCARG(uap, offset); 2660 2661 return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp), 2662 SCARG(uap, iovcnt), &offset, 0, retval); 2663 } 2664 2665 /* 2666 * Positional write system call. 2667 */ 2668 int 2669 sys_pwrite(struct lwp *l, const struct sys_pwrite_args *uap, register_t *retval) 2670 { 2671 /* { 2672 syscallarg(int) fd; 2673 syscallarg(const void *) buf; 2674 syscallarg(size_t) nbyte; 2675 syscallarg(off_t) offset; 2676 } */ 2677 file_t *fp; 2678 struct vnode *vp; 2679 off_t offset; 2680 int error, fd = SCARG(uap, fd); 2681 2682 if ((fp = fd_getfile(fd)) == NULL) 2683 return (EBADF); 2684 2685 if ((fp->f_flag & FWRITE) == 0) { 2686 fd_putfile(fd); 2687 return (EBADF); 2688 } 2689 2690 vp = fp->f_data; 2691 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2692 error = ESPIPE; 2693 goto out; 2694 } 2695 2696 offset = SCARG(uap, offset); 2697 2698 /* 2699 * XXX This works because no file systems actually 2700 * XXX take any action on the seek operation. 2701 */ 2702 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2703 goto out; 2704 2705 /* dofilewrite() will unuse the descriptor for us */ 2706 return (dofilewrite(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2707 &offset, 0, retval)); 2708 2709 out: 2710 fd_putfile(fd); 2711 return (error); 2712 } 2713 2714 /* 2715 * Positional gather write system call. 2716 */ 2717 int 2718 sys_pwritev(struct lwp *l, const struct sys_pwritev_args *uap, register_t *retval) 2719 { 2720 /* { 2721 syscallarg(int) fd; 2722 syscallarg(const struct iovec *) iovp; 2723 syscallarg(int) iovcnt; 2724 syscallarg(off_t) offset; 2725 } */ 2726 off_t offset = SCARG(uap, offset); 2727 2728 return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp), 2729 SCARG(uap, iovcnt), &offset, 0, retval); 2730 } 2731 2732 /* 2733 * Check access permissions. 2734 */ 2735 int 2736 sys_access(struct lwp *l, const struct sys_access_args *uap, register_t *retval) 2737 { 2738 /* { 2739 syscallarg(const char *) path; 2740 syscallarg(int) flags; 2741 } */ 2742 kauth_cred_t cred; 2743 struct vnode *vp; 2744 int error, flags; 2745 struct pathbuf *pb; 2746 struct nameidata nd; 2747 2748 CTASSERT(F_OK == 0); 2749 if ((SCARG(uap, flags) & ~(R_OK | W_OK | X_OK)) != 0) { 2750 /* nonsense flags */ 2751 return EINVAL; 2752 } 2753 2754 error = pathbuf_copyin(SCARG(uap, path), &pb); 2755 if (error) { 2756 return error; 2757 } 2758 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 2759 2760 /* Override default credentials */ 2761 cred = kauth_cred_dup(l->l_cred); 2762 kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); 2763 kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); 2764 nd.ni_cnd.cn_cred = cred; 2765 2766 if ((error = namei(&nd)) != 0) { 2767 pathbuf_destroy(pb); 2768 goto out; 2769 } 2770 vp = nd.ni_vp; 2771 pathbuf_destroy(pb); 2772 2773 /* Flags == 0 means only check for existence. */ 2774 if (SCARG(uap, flags)) { 2775 flags = 0; 2776 if (SCARG(uap, flags) & R_OK) 2777 flags |= VREAD; 2778 if (SCARG(uap, flags) & W_OK) 2779 flags |= VWRITE; 2780 if (SCARG(uap, flags) & X_OK) 2781 flags |= VEXEC; 2782 2783 error = VOP_ACCESS(vp, flags, cred); 2784 if (!error && (flags & VWRITE)) 2785 error = vn_writechk(vp); 2786 } 2787 vput(vp); 2788 out: 2789 kauth_cred_free(cred); 2790 return (error); 2791 } 2792 2793 int 2794 sys_faccessat(struct lwp *l, const struct sys_faccessat_args *uap, 2795 register_t *retval) 2796 { 2797 /* { 2798 syscallarg(int) fd; 2799 syscallarg(const char *) path; 2800 syscallarg(int) amode; 2801 syscallarg(int) flag; 2802 } */ 2803 2804 return ENOSYS; 2805 } 2806 2807 /* 2808 * Common code for all sys_stat functions, including compat versions. 2809 */ 2810 int 2811 do_sys_stat(const char *userpath, unsigned int nd_flags, struct stat *sb) 2812 { 2813 int error; 2814 struct pathbuf *pb; 2815 struct nameidata nd; 2816 2817 error = pathbuf_copyin(userpath, &pb); 2818 if (error) { 2819 return error; 2820 } 2821 NDINIT(&nd, LOOKUP, nd_flags | LOCKLEAF | TRYEMULROOT, pb); 2822 error = namei(&nd); 2823 if (error != 0) { 2824 pathbuf_destroy(pb); 2825 return error; 2826 } 2827 error = vn_stat(nd.ni_vp, sb); 2828 vput(nd.ni_vp); 2829 pathbuf_destroy(pb); 2830 return error; 2831 } 2832 2833 /* 2834 * Get file status; this version follows links. 2835 */ 2836 /* ARGSUSED */ 2837 int 2838 sys___stat50(struct lwp *l, const struct sys___stat50_args *uap, register_t *retval) 2839 { 2840 /* { 2841 syscallarg(const char *) path; 2842 syscallarg(struct stat *) ub; 2843 } */ 2844 struct stat sb; 2845 int error; 2846 2847 error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); 2848 if (error) 2849 return error; 2850 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2851 } 2852 2853 /* 2854 * Get file status; this version does not follow links. 2855 */ 2856 /* ARGSUSED */ 2857 int 2858 sys___lstat50(struct lwp *l, const struct sys___lstat50_args *uap, register_t *retval) 2859 { 2860 /* { 2861 syscallarg(const char *) path; 2862 syscallarg(struct stat *) ub; 2863 } */ 2864 struct stat sb; 2865 int error; 2866 2867 error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb); 2868 if (error) 2869 return error; 2870 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2871 } 2872 2873 int 2874 sys_fstatat(struct lwp *l, const struct sys_fstatat_args *uap, 2875 register_t *retval) 2876 { 2877 /* { 2878 syscallarg(int) fd; 2879 syscallarg(const char *) path; 2880 syscallarg(struct stat *) ub; 2881 syscallarg(int) flag; 2882 } */ 2883 2884 return ENOSYS; 2885 } 2886 /* 2887 * Get configurable pathname variables. 2888 */ 2889 /* ARGSUSED */ 2890 int 2891 sys_pathconf(struct lwp *l, const struct sys_pathconf_args *uap, register_t *retval) 2892 { 2893 /* { 2894 syscallarg(const char *) path; 2895 syscallarg(int) name; 2896 } */ 2897 int error; 2898 struct pathbuf *pb; 2899 struct nameidata nd; 2900 2901 error = pathbuf_copyin(SCARG(uap, path), &pb); 2902 if (error) { 2903 return error; 2904 } 2905 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 2906 if ((error = namei(&nd)) != 0) { 2907 pathbuf_destroy(pb); 2908 return (error); 2909 } 2910 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2911 vput(nd.ni_vp); 2912 pathbuf_destroy(pb); 2913 return (error); 2914 } 2915 2916 /* 2917 * Return target name of a symbolic link. 2918 */ 2919 /* ARGSUSED */ 2920 int 2921 sys_readlink(struct lwp *l, const struct sys_readlink_args *uap, register_t *retval) 2922 { 2923 /* { 2924 syscallarg(const char *) path; 2925 syscallarg(char *) buf; 2926 syscallarg(size_t) count; 2927 } */ 2928 struct vnode *vp; 2929 struct iovec aiov; 2930 struct uio auio; 2931 int error; 2932 struct pathbuf *pb; 2933 struct nameidata nd; 2934 2935 error = pathbuf_copyin(SCARG(uap, path), &pb); 2936 if (error) { 2937 return error; 2938 } 2939 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, pb); 2940 if ((error = namei(&nd)) != 0) { 2941 pathbuf_destroy(pb); 2942 return error; 2943 } 2944 vp = nd.ni_vp; 2945 pathbuf_destroy(pb); 2946 if (vp->v_type != VLNK) 2947 error = EINVAL; 2948 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2949 (error = VOP_ACCESS(vp, VREAD, l->l_cred)) == 0) { 2950 aiov.iov_base = SCARG(uap, buf); 2951 aiov.iov_len = SCARG(uap, count); 2952 auio.uio_iov = &aiov; 2953 auio.uio_iovcnt = 1; 2954 auio.uio_offset = 0; 2955 auio.uio_rw = UIO_READ; 2956 KASSERT(l == curlwp); 2957 auio.uio_vmspace = l->l_proc->p_vmspace; 2958 auio.uio_resid = SCARG(uap, count); 2959 error = VOP_READLINK(vp, &auio, l->l_cred); 2960 } 2961 vput(vp); 2962 *retval = SCARG(uap, count) - auio.uio_resid; 2963 return (error); 2964 } 2965 2966 int 2967 sys_readlinkat(struct lwp *l, const struct sys_readlinkat_args *uap, 2968 register_t *retval) 2969 { 2970 /* { 2971 syscallarg(int) fd; 2972 syscallarg(const char *) path; 2973 syscallarg(char *) buf; 2974 syscallarg(size_t) count; 2975 } */ 2976 2977 return ENOSYS; 2978 } 2979 2980 /* 2981 * Change flags of a file given a path name. 2982 */ 2983 /* ARGSUSED */ 2984 int 2985 sys_chflags(struct lwp *l, const struct sys_chflags_args *uap, register_t *retval) 2986 { 2987 /* { 2988 syscallarg(const char *) path; 2989 syscallarg(u_long) flags; 2990 } */ 2991 struct vnode *vp; 2992 int error; 2993 2994 error = namei_simple_user(SCARG(uap, path), 2995 NSM_FOLLOW_TRYEMULROOT, &vp); 2996 if (error != 0) 2997 return (error); 2998 error = change_flags(vp, SCARG(uap, flags), l); 2999 vput(vp); 3000 return (error); 3001 } 3002 3003 /* 3004 * Change flags of a file given a file descriptor. 3005 */ 3006 /* ARGSUSED */ 3007 int 3008 sys_fchflags(struct lwp *l, const struct sys_fchflags_args *uap, register_t *retval) 3009 { 3010 /* { 3011 syscallarg(int) fd; 3012 syscallarg(u_long) flags; 3013 } */ 3014 struct vnode *vp; 3015 file_t *fp; 3016 int error; 3017 3018 /* fd_getvnode() will use the descriptor for us */ 3019 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3020 return (error); 3021 vp = fp->f_data; 3022 error = change_flags(vp, SCARG(uap, flags), l); 3023 VOP_UNLOCK(vp); 3024 fd_putfile(SCARG(uap, fd)); 3025 return (error); 3026 } 3027 3028 /* 3029 * Change flags of a file given a path name; this version does 3030 * not follow links. 3031 */ 3032 int 3033 sys_lchflags(struct lwp *l, const struct sys_lchflags_args *uap, register_t *retval) 3034 { 3035 /* { 3036 syscallarg(const char *) path; 3037 syscallarg(u_long) flags; 3038 } */ 3039 struct vnode *vp; 3040 int error; 3041 3042 error = namei_simple_user(SCARG(uap, path), 3043 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3044 if (error != 0) 3045 return (error); 3046 error = change_flags(vp, SCARG(uap, flags), l); 3047 vput(vp); 3048 return (error); 3049 } 3050 3051 /* 3052 * Common routine to change flags of a file. 3053 */ 3054 int 3055 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 3056 { 3057 struct vattr vattr; 3058 int error; 3059 3060 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3061 3062 vattr_null(&vattr); 3063 vattr.va_flags = flags; 3064 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3065 3066 return (error); 3067 } 3068 3069 /* 3070 * Change mode of a file given path name; this version follows links. 3071 */ 3072 /* ARGSUSED */ 3073 int 3074 sys_chmod(struct lwp *l, const struct sys_chmod_args *uap, register_t *retval) 3075 { 3076 /* { 3077 syscallarg(const char *) path; 3078 syscallarg(int) mode; 3079 } */ 3080 int error; 3081 struct vnode *vp; 3082 3083 error = namei_simple_user(SCARG(uap, path), 3084 NSM_FOLLOW_TRYEMULROOT, &vp); 3085 if (error != 0) 3086 return (error); 3087 3088 error = change_mode(vp, SCARG(uap, mode), l); 3089 3090 vrele(vp); 3091 return (error); 3092 } 3093 3094 /* 3095 * Change mode of a file given a file descriptor. 3096 */ 3097 /* ARGSUSED */ 3098 int 3099 sys_fchmod(struct lwp *l, const struct sys_fchmod_args *uap, register_t *retval) 3100 { 3101 /* { 3102 syscallarg(int) fd; 3103 syscallarg(int) mode; 3104 } */ 3105 file_t *fp; 3106 int error; 3107 3108 /* fd_getvnode() will use the descriptor for us */ 3109 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3110 return (error); 3111 error = change_mode(fp->f_data, SCARG(uap, mode), l); 3112 fd_putfile(SCARG(uap, fd)); 3113 return (error); 3114 } 3115 3116 int 3117 sys_fchmodat(struct lwp *l, const struct sys_fchmodat_args *uap, 3118 register_t *retval) 3119 { 3120 /* { 3121 syscallarg(int) fd; 3122 syscallarg(const char *) path; 3123 syscallarg(int) mode; 3124 syscallarg(int) flag; 3125 } */ 3126 3127 return ENOSYS; 3128 } 3129 3130 /* 3131 * Change mode of a file given path name; this version does not follow links. 3132 */ 3133 /* ARGSUSED */ 3134 int 3135 sys_lchmod(struct lwp *l, const struct sys_lchmod_args *uap, register_t *retval) 3136 { 3137 /* { 3138 syscallarg(const char *) path; 3139 syscallarg(int) mode; 3140 } */ 3141 int error; 3142 struct vnode *vp; 3143 3144 error = namei_simple_user(SCARG(uap, path), 3145 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3146 if (error != 0) 3147 return (error); 3148 3149 error = change_mode(vp, SCARG(uap, mode), l); 3150 3151 vrele(vp); 3152 return (error); 3153 } 3154 3155 /* 3156 * Common routine to set mode given a vnode. 3157 */ 3158 static int 3159 change_mode(struct vnode *vp, int mode, struct lwp *l) 3160 { 3161 struct vattr vattr; 3162 int error; 3163 3164 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3165 vattr_null(&vattr); 3166 vattr.va_mode = mode & ALLPERMS; 3167 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3168 VOP_UNLOCK(vp); 3169 return (error); 3170 } 3171 3172 /* 3173 * Set ownership given a path name; this version follows links. 3174 */ 3175 /* ARGSUSED */ 3176 int 3177 sys_chown(struct lwp *l, const struct sys_chown_args *uap, register_t *retval) 3178 { 3179 /* { 3180 syscallarg(const char *) path; 3181 syscallarg(uid_t) uid; 3182 syscallarg(gid_t) gid; 3183 } */ 3184 int error; 3185 struct vnode *vp; 3186 3187 error = namei_simple_user(SCARG(uap, path), 3188 NSM_FOLLOW_TRYEMULROOT, &vp); 3189 if (error != 0) 3190 return (error); 3191 3192 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 3193 3194 vrele(vp); 3195 return (error); 3196 } 3197 3198 /* 3199 * Set ownership given a path name; this version follows links. 3200 * Provides POSIX semantics. 3201 */ 3202 /* ARGSUSED */ 3203 int 3204 sys___posix_chown(struct lwp *l, const struct sys___posix_chown_args *uap, register_t *retval) 3205 { 3206 /* { 3207 syscallarg(const char *) path; 3208 syscallarg(uid_t) uid; 3209 syscallarg(gid_t) gid; 3210 } */ 3211 int error; 3212 struct vnode *vp; 3213 3214 error = namei_simple_user(SCARG(uap, path), 3215 NSM_FOLLOW_TRYEMULROOT, &vp); 3216 if (error != 0) 3217 return (error); 3218 3219 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3220 3221 vrele(vp); 3222 return (error); 3223 } 3224 3225 /* 3226 * Set ownership given a file descriptor. 3227 */ 3228 /* ARGSUSED */ 3229 int 3230 sys_fchown(struct lwp *l, const struct sys_fchown_args *uap, register_t *retval) 3231 { 3232 /* { 3233 syscallarg(int) fd; 3234 syscallarg(uid_t) uid; 3235 syscallarg(gid_t) gid; 3236 } */ 3237 int error; 3238 file_t *fp; 3239 3240 /* fd_getvnode() will use the descriptor for us */ 3241 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3242 return (error); 3243 error = change_owner(fp->f_data, SCARG(uap, uid), SCARG(uap, gid), 3244 l, 0); 3245 fd_putfile(SCARG(uap, fd)); 3246 return (error); 3247 } 3248 3249 int 3250 sys_fchownat(struct lwp *l, const struct sys_fchownat_args *uap, 3251 register_t *retval) 3252 { 3253 /* { 3254 syscallarg(int) fd; 3255 syscallarg(const char *) path; 3256 syscallarg(uid_t) uid; 3257 syscallarg(gid_t) gid; 3258 syscallarg(int) flag; 3259 } */ 3260 3261 return ENOSYS; 3262 } 3263 3264 /* 3265 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 3266 */ 3267 /* ARGSUSED */ 3268 int 3269 sys___posix_fchown(struct lwp *l, const struct sys___posix_fchown_args *uap, register_t *retval) 3270 { 3271 /* { 3272 syscallarg(int) fd; 3273 syscallarg(uid_t) uid; 3274 syscallarg(gid_t) gid; 3275 } */ 3276 int error; 3277 file_t *fp; 3278 3279 /* fd_getvnode() will use the descriptor for us */ 3280 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3281 return (error); 3282 error = change_owner(fp->f_data, SCARG(uap, uid), SCARG(uap, gid), 3283 l, 1); 3284 fd_putfile(SCARG(uap, fd)); 3285 return (error); 3286 } 3287 3288 /* 3289 * Set ownership given a path name; this version does not follow links. 3290 */ 3291 /* ARGSUSED */ 3292 int 3293 sys_lchown(struct lwp *l, const struct sys_lchown_args *uap, register_t *retval) 3294 { 3295 /* { 3296 syscallarg(const char *) path; 3297 syscallarg(uid_t) uid; 3298 syscallarg(gid_t) gid; 3299 } */ 3300 int error; 3301 struct vnode *vp; 3302 3303 error = namei_simple_user(SCARG(uap, path), 3304 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3305 if (error != 0) 3306 return (error); 3307 3308 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 3309 3310 vrele(vp); 3311 return (error); 3312 } 3313 3314 /* 3315 * Set ownership given a path name; this version does not follow links. 3316 * Provides POSIX/XPG semantics. 3317 */ 3318 /* ARGSUSED */ 3319 int 3320 sys___posix_lchown(struct lwp *l, const struct sys___posix_lchown_args *uap, register_t *retval) 3321 { 3322 /* { 3323 syscallarg(const char *) path; 3324 syscallarg(uid_t) uid; 3325 syscallarg(gid_t) gid; 3326 } */ 3327 int error; 3328 struct vnode *vp; 3329 3330 error = namei_simple_user(SCARG(uap, path), 3331 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3332 if (error != 0) 3333 return (error); 3334 3335 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3336 3337 vrele(vp); 3338 return (error); 3339 } 3340 3341 /* 3342 * Common routine to set ownership given a vnode. 3343 */ 3344 static int 3345 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 3346 int posix_semantics) 3347 { 3348 struct vattr vattr; 3349 mode_t newmode; 3350 int error; 3351 3352 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3353 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) 3354 goto out; 3355 3356 #define CHANGED(x) ((int)(x) != -1) 3357 newmode = vattr.va_mode; 3358 if (posix_semantics) { 3359 /* 3360 * POSIX/XPG semantics: if the caller is not the super-user, 3361 * clear set-user-id and set-group-id bits. Both POSIX and 3362 * the XPG consider the behaviour for calls by the super-user 3363 * implementation-defined; we leave the set-user-id and set- 3364 * group-id settings intact in that case. 3365 */ 3366 if (vattr.va_mode & S_ISUID) { 3367 if (kauth_authorize_vnode(l->l_cred, 3368 KAUTH_VNODE_RETAIN_SUID, vp, NULL, EPERM) != 0) 3369 newmode &= ~S_ISUID; 3370 } 3371 if (vattr.va_mode & S_ISGID) { 3372 if (kauth_authorize_vnode(l->l_cred, 3373 KAUTH_VNODE_RETAIN_SGID, vp, NULL, EPERM) != 0) 3374 newmode &= ~S_ISGID; 3375 } 3376 } else { 3377 /* 3378 * NetBSD semantics: when changing owner and/or group, 3379 * clear the respective bit(s). 3380 */ 3381 if (CHANGED(uid)) 3382 newmode &= ~S_ISUID; 3383 if (CHANGED(gid)) 3384 newmode &= ~S_ISGID; 3385 } 3386 /* Update va_mode iff altered. */ 3387 if (vattr.va_mode == newmode) 3388 newmode = VNOVAL; 3389 3390 vattr_null(&vattr); 3391 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 3392 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 3393 vattr.va_mode = newmode; 3394 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3395 #undef CHANGED 3396 3397 out: 3398 VOP_UNLOCK(vp); 3399 return (error); 3400 } 3401 3402 /* 3403 * Set the access and modification times given a path name; this 3404 * version follows links. 3405 */ 3406 /* ARGSUSED */ 3407 int 3408 sys___utimes50(struct lwp *l, const struct sys___utimes50_args *uap, 3409 register_t *retval) 3410 { 3411 /* { 3412 syscallarg(const char *) path; 3413 syscallarg(const struct timeval *) tptr; 3414 } */ 3415 3416 return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, 3417 SCARG(uap, tptr), UIO_USERSPACE); 3418 } 3419 3420 /* 3421 * Set the access and modification times given a file descriptor. 3422 */ 3423 /* ARGSUSED */ 3424 int 3425 sys___futimes50(struct lwp *l, const struct sys___futimes50_args *uap, 3426 register_t *retval) 3427 { 3428 /* { 3429 syscallarg(int) fd; 3430 syscallarg(const struct timeval *) tptr; 3431 } */ 3432 int error; 3433 file_t *fp; 3434 3435 /* fd_getvnode() will use the descriptor for us */ 3436 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3437 return (error); 3438 error = do_sys_utimes(l, fp->f_data, NULL, 0, SCARG(uap, tptr), 3439 UIO_USERSPACE); 3440 fd_putfile(SCARG(uap, fd)); 3441 return (error); 3442 } 3443 3444 int 3445 sys_futimens(struct lwp *l, const struct sys_futimens_args *uap, 3446 register_t *retval) 3447 { 3448 /* { 3449 syscallarg(int) fd; 3450 syscallarg(const struct timespec *) tptr; 3451 } */ 3452 int error; 3453 file_t *fp; 3454 3455 /* fd_getvnode() will use the descriptor for us */ 3456 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3457 return (error); 3458 error = do_sys_utimens(l, fp->f_data, NULL, 0, SCARG(uap, tptr), 3459 UIO_USERSPACE); 3460 fd_putfile(SCARG(uap, fd)); 3461 return (error); 3462 } 3463 3464 /* 3465 * Set the access and modification times given a path name; this 3466 * version does not follow links. 3467 */ 3468 int 3469 sys___lutimes50(struct lwp *l, const struct sys___lutimes50_args *uap, 3470 register_t *retval) 3471 { 3472 /* { 3473 syscallarg(const char *) path; 3474 syscallarg(const struct timeval *) tptr; 3475 } */ 3476 3477 return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW, 3478 SCARG(uap, tptr), UIO_USERSPACE); 3479 } 3480 3481 int 3482 sys_utimensat(struct lwp *l, const struct sys_utimensat_args *uap, 3483 register_t *retval) 3484 { 3485 /* { 3486 syscallarg(int) fd; 3487 syscallarg(const char *) path; 3488 syscallarg(const struct timespec *) tptr; 3489 syscallarg(int) flag; 3490 } */ 3491 int follow; 3492 const struct timespec *tptr; 3493 3494 /* 3495 * Specified fd is not yet implemented 3496 */ 3497 if (SCARG(uap, fd) != AT_FDCWD) 3498 return ENOSYS; 3499 3500 tptr = SCARG(uap, tptr); 3501 follow = (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 3502 3503 return do_sys_utimens(l, NULL, SCARG(uap, path), follow, 3504 tptr, UIO_USERSPACE); 3505 } 3506 3507 /* 3508 * Common routine to set access and modification times given a vnode. 3509 */ 3510 int 3511 do_sys_utimens(struct lwp *l, struct vnode *vp, const char *path, int flag, 3512 const struct timespec *tptr, enum uio_seg seg) 3513 { 3514 struct vattr vattr; 3515 int error, dorele = 0; 3516 namei_simple_flags_t sflags; 3517 3518 bool vanull, setbirthtime; 3519 struct timespec ts[2]; 3520 3521 /* 3522 * I have checked all callers and they pass either FOLLOW, 3523 * NOFOLLOW, or 0 (when they don't pass a path), and NOFOLLOW 3524 * is 0. More to the point, they don't pass anything else. 3525 * Let's keep it that way at least until the namei interfaces 3526 * are fully sanitized. 3527 */ 3528 KASSERT(flag == NOFOLLOW || flag == FOLLOW); 3529 sflags = (flag == FOLLOW) ? 3530 NSM_FOLLOW_TRYEMULROOT : NSM_NOFOLLOW_TRYEMULROOT; 3531 3532 if (tptr == NULL) { 3533 vanull = true; 3534 nanotime(&ts[0]); 3535 ts[1] = ts[0]; 3536 } else { 3537 vanull = false; 3538 if (seg != UIO_SYSSPACE) { 3539 error = copyin(tptr, ts, sizeof (ts)); 3540 if (error != 0) 3541 return error; 3542 } else { 3543 ts[0] = tptr[0]; 3544 ts[1] = tptr[1]; 3545 } 3546 } 3547 3548 if (ts[0].tv_nsec == UTIME_NOW) { 3549 nanotime(&ts[0]); 3550 if (ts[1].tv_nsec == UTIME_NOW) { 3551 vanull = true; 3552 ts[1] = ts[0]; 3553 } 3554 } else if (ts[1].tv_nsec == UTIME_NOW) 3555 nanotime(&ts[1]); 3556 3557 if (vp == NULL) { 3558 /* note: SEG describes TPTR, not PATH; PATH is always user */ 3559 error = namei_simple_user(path, sflags, &vp); 3560 if (error != 0) 3561 return error; 3562 dorele = 1; 3563 } 3564 3565 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3566 setbirthtime = (VOP_GETATTR(vp, &vattr, l->l_cred) == 0 && 3567 timespeccmp(&ts[1], &vattr.va_birthtime, <)); 3568 vattr_null(&vattr); 3569 3570 if (ts[0].tv_nsec != UTIME_OMIT) 3571 vattr.va_atime = ts[0]; 3572 3573 if (ts[1].tv_nsec != UTIME_OMIT) { 3574 vattr.va_mtime = ts[1]; 3575 if (setbirthtime) 3576 vattr.va_birthtime = ts[1]; 3577 } 3578 3579 if (vanull) 3580 vattr.va_vaflags |= VA_UTIMES_NULL; 3581 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3582 VOP_UNLOCK(vp); 3583 3584 if (dorele != 0) 3585 vrele(vp); 3586 3587 return error; 3588 } 3589 3590 int 3591 do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag, 3592 const struct timeval *tptr, enum uio_seg seg) 3593 { 3594 struct timespec ts[2]; 3595 struct timespec *tsptr = NULL; 3596 int error; 3597 3598 if (tptr != NULL) { 3599 struct timeval tv[2]; 3600 3601 if (seg != UIO_SYSSPACE) { 3602 error = copyin(tptr, tv, sizeof (tv)); 3603 if (error != 0) 3604 return error; 3605 tptr = tv; 3606 } 3607 3608 if ((tv[0].tv_usec == UTIME_NOW) || 3609 (tv[0].tv_usec == UTIME_OMIT)) 3610 ts[0].tv_nsec = tv[0].tv_usec; 3611 else 3612 TIMEVAL_TO_TIMESPEC(&tptr[0], &ts[0]); 3613 3614 if ((tv[1].tv_usec == UTIME_NOW) || 3615 (tv[1].tv_usec == UTIME_OMIT)) 3616 ts[1].tv_nsec = tv[1].tv_usec; 3617 else 3618 TIMEVAL_TO_TIMESPEC(&tptr[1], &ts[1]); 3619 3620 tsptr = &ts[0]; 3621 } 3622 3623 return do_sys_utimens(l, vp, path, flag, tsptr, UIO_SYSSPACE); 3624 } 3625 3626 /* 3627 * Truncate a file given its path name. 3628 */ 3629 /* ARGSUSED */ 3630 int 3631 sys_truncate(struct lwp *l, const struct sys_truncate_args *uap, register_t *retval) 3632 { 3633 /* { 3634 syscallarg(const char *) path; 3635 syscallarg(int) pad; 3636 syscallarg(off_t) length; 3637 } */ 3638 struct vnode *vp; 3639 struct vattr vattr; 3640 int error; 3641 3642 error = namei_simple_user(SCARG(uap, path), 3643 NSM_FOLLOW_TRYEMULROOT, &vp); 3644 if (error != 0) 3645 return (error); 3646 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3647 if (vp->v_type == VDIR) 3648 error = EISDIR; 3649 else if ((error = vn_writechk(vp)) == 0 && 3650 (error = VOP_ACCESS(vp, VWRITE, l->l_cred)) == 0) { 3651 vattr_null(&vattr); 3652 vattr.va_size = SCARG(uap, length); 3653 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3654 } 3655 vput(vp); 3656 return (error); 3657 } 3658 3659 /* 3660 * Truncate a file given a file descriptor. 3661 */ 3662 /* ARGSUSED */ 3663 int 3664 sys_ftruncate(struct lwp *l, const struct sys_ftruncate_args *uap, register_t *retval) 3665 { 3666 /* { 3667 syscallarg(int) fd; 3668 syscallarg(int) pad; 3669 syscallarg(off_t) length; 3670 } */ 3671 struct vattr vattr; 3672 struct vnode *vp; 3673 file_t *fp; 3674 int error; 3675 3676 /* fd_getvnode() will use the descriptor for us */ 3677 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3678 return (error); 3679 if ((fp->f_flag & FWRITE) == 0) { 3680 error = EINVAL; 3681 goto out; 3682 } 3683 vp = fp->f_data; 3684 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3685 if (vp->v_type == VDIR) 3686 error = EISDIR; 3687 else if ((error = vn_writechk(vp)) == 0) { 3688 vattr_null(&vattr); 3689 vattr.va_size = SCARG(uap, length); 3690 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 3691 } 3692 VOP_UNLOCK(vp); 3693 out: 3694 fd_putfile(SCARG(uap, fd)); 3695 return (error); 3696 } 3697 3698 /* 3699 * Sync an open file. 3700 */ 3701 /* ARGSUSED */ 3702 int 3703 sys_fsync(struct lwp *l, const struct sys_fsync_args *uap, register_t *retval) 3704 { 3705 /* { 3706 syscallarg(int) fd; 3707 } */ 3708 struct vnode *vp; 3709 file_t *fp; 3710 int error; 3711 3712 /* fd_getvnode() will use the descriptor for us */ 3713 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3714 return (error); 3715 vp = fp->f_data; 3716 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3717 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0); 3718 VOP_UNLOCK(vp); 3719 fd_putfile(SCARG(uap, fd)); 3720 return (error); 3721 } 3722 3723 /* 3724 * Sync a range of file data. API modeled after that found in AIX. 3725 * 3726 * FDATASYNC indicates that we need only save enough metadata to be able 3727 * to re-read the written data. Note we duplicate AIX's requirement that 3728 * the file be open for writing. 3729 */ 3730 /* ARGSUSED */ 3731 int 3732 sys_fsync_range(struct lwp *l, const struct sys_fsync_range_args *uap, register_t *retval) 3733 { 3734 /* { 3735 syscallarg(int) fd; 3736 syscallarg(int) flags; 3737 syscallarg(off_t) start; 3738 syscallarg(off_t) length; 3739 } */ 3740 struct vnode *vp; 3741 file_t *fp; 3742 int flags, nflags; 3743 off_t s, e, len; 3744 int error; 3745 3746 /* fd_getvnode() will use the descriptor for us */ 3747 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3748 return (error); 3749 3750 if ((fp->f_flag & FWRITE) == 0) { 3751 error = EBADF; 3752 goto out; 3753 } 3754 3755 flags = SCARG(uap, flags); 3756 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 3757 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 3758 error = EINVAL; 3759 goto out; 3760 } 3761 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 3762 if (flags & FDATASYNC) 3763 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 3764 else 3765 nflags = FSYNC_WAIT; 3766 if (flags & FDISKSYNC) 3767 nflags |= FSYNC_CACHE; 3768 3769 len = SCARG(uap, length); 3770 /* If length == 0, we do the whole file, and s = e = 0 will do that */ 3771 if (len) { 3772 s = SCARG(uap, start); 3773 e = s + len; 3774 if (e < s) { 3775 error = EINVAL; 3776 goto out; 3777 } 3778 } else { 3779 e = 0; 3780 s = 0; 3781 } 3782 3783 vp = fp->f_data; 3784 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3785 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e); 3786 VOP_UNLOCK(vp); 3787 out: 3788 fd_putfile(SCARG(uap, fd)); 3789 return (error); 3790 } 3791 3792 /* 3793 * Sync the data of an open file. 3794 */ 3795 /* ARGSUSED */ 3796 int 3797 sys_fdatasync(struct lwp *l, const struct sys_fdatasync_args *uap, register_t *retval) 3798 { 3799 /* { 3800 syscallarg(int) fd; 3801 } */ 3802 struct vnode *vp; 3803 file_t *fp; 3804 int error; 3805 3806 /* fd_getvnode() will use the descriptor for us */ 3807 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3808 return (error); 3809 if ((fp->f_flag & FWRITE) == 0) { 3810 fd_putfile(SCARG(uap, fd)); 3811 return (EBADF); 3812 } 3813 vp = fp->f_data; 3814 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3815 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0); 3816 VOP_UNLOCK(vp); 3817 fd_putfile(SCARG(uap, fd)); 3818 return (error); 3819 } 3820 3821 /* 3822 * Rename files, (standard) BSD semantics frontend. 3823 */ 3824 /* ARGSUSED */ 3825 int 3826 sys_rename(struct lwp *l, const struct sys_rename_args *uap, register_t *retval) 3827 { 3828 /* { 3829 syscallarg(const char *) from; 3830 syscallarg(const char *) to; 3831 } */ 3832 3833 return (do_sys_rename(SCARG(uap, from), SCARG(uap, to), UIO_USERSPACE, 0)); 3834 } 3835 3836 int 3837 sys_renameat(struct lwp *l, const struct sys_renameat_args *uap, 3838 register_t *retval) 3839 { 3840 /* { 3841 syscallarg(int) fromfd; 3842 syscallarg(const char *) from; 3843 syscallarg(int) tofd; 3844 syscallarg(const char *) to; 3845 } */ 3846 3847 return ENOSYS; 3848 } 3849 3850 /* 3851 * Rename files, POSIX semantics frontend. 3852 */ 3853 /* ARGSUSED */ 3854 int 3855 sys___posix_rename(struct lwp *l, const struct sys___posix_rename_args *uap, register_t *retval) 3856 { 3857 /* { 3858 syscallarg(const char *) from; 3859 syscallarg(const char *) to; 3860 } */ 3861 3862 return (do_sys_rename(SCARG(uap, from), SCARG(uap, to), UIO_USERSPACE, 1)); 3863 } 3864 3865 /* 3866 * Rename files. Source and destination must either both be directories, 3867 * or both not be directories. If target is a directory, it must be empty. 3868 * If `from' and `to' refer to the same object, the value of the `retain' 3869 * argument is used to determine whether `from' will be 3870 * 3871 * (retain == 0) deleted unless `from' and `to' refer to the same 3872 * object in the file system's name space (BSD). 3873 * (retain == 1) always retained (POSIX). 3874 */ 3875 int 3876 do_sys_rename(const char *from, const char *to, enum uio_seg seg, int retain) 3877 { 3878 struct vnode *tvp, *fvp, *tdvp; 3879 struct pathbuf *frompb, *topb; 3880 struct nameidata fromnd, tond; 3881 struct mount *fs; 3882 int error; 3883 3884 error = pathbuf_maybe_copyin(from, seg, &frompb); 3885 if (error) { 3886 return error; 3887 } 3888 error = pathbuf_maybe_copyin(to, seg, &topb); 3889 if (error) { 3890 pathbuf_destroy(frompb); 3891 return error; 3892 } 3893 3894 NDINIT(&fromnd, DELETE, LOCKPARENT | TRYEMULROOT | INRENAME, 3895 frompb); 3896 if ((error = namei(&fromnd)) != 0) { 3897 pathbuf_destroy(frompb); 3898 pathbuf_destroy(topb); 3899 return (error); 3900 } 3901 if (fromnd.ni_dvp != fromnd.ni_vp) 3902 VOP_UNLOCK(fromnd.ni_dvp); 3903 fvp = fromnd.ni_vp; 3904 3905 fs = fvp->v_mount; 3906 error = VFS_RENAMELOCK_ENTER(fs); 3907 if (error) { 3908 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3909 vrele(fromnd.ni_dvp); 3910 vrele(fvp); 3911 goto out1; 3912 } 3913 3914 /* 3915 * close, partially, yet another race - ideally we should only 3916 * go as far as getting fromnd.ni_dvp before getting the per-fs 3917 * lock, and then continue to get fromnd.ni_vp, but we can't do 3918 * that with namei as it stands. 3919 * 3920 * This still won't prevent rmdir from nuking fromnd.ni_vp 3921 * under us. The real fix is to get the locks in the right 3922 * order and do the lookups in the right places, but that's a 3923 * major rototill. 3924 * 3925 * Note: this logic (as well as this whole function) is cloned 3926 * in nfs_serv.c. Proceed accordingly. 3927 */ 3928 vrele(fvp); 3929 if ((fromnd.ni_cnd.cn_namelen == 1 && 3930 fromnd.ni_cnd.cn_nameptr[0] == '.') || 3931 (fromnd.ni_cnd.cn_namelen == 2 && 3932 fromnd.ni_cnd.cn_nameptr[0] == '.' && 3933 fromnd.ni_cnd.cn_nameptr[1] == '.')) { 3934 error = EINVAL; 3935 VFS_RENAMELOCK_EXIT(fs); 3936 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3937 vrele(fromnd.ni_dvp); 3938 goto out1; 3939 } 3940 vn_lock(fromnd.ni_dvp, LK_EXCLUSIVE | LK_RETRY); 3941 error = relookup(fromnd.ni_dvp, &fromnd.ni_vp, &fromnd.ni_cnd, 0); 3942 if (error) { 3943 VOP_UNLOCK(fromnd.ni_dvp); 3944 VFS_RENAMELOCK_EXIT(fs); 3945 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3946 vrele(fromnd.ni_dvp); 3947 goto out1; 3948 } 3949 VOP_UNLOCK(fromnd.ni_vp); 3950 if (fromnd.ni_dvp != fromnd.ni_vp) 3951 VOP_UNLOCK(fromnd.ni_dvp); 3952 fvp = fromnd.ni_vp; 3953 3954 NDINIT(&tond, RENAME, 3955 LOCKPARENT | LOCKLEAF | NOCACHE | TRYEMULROOT 3956 | INRENAME | (fvp->v_type == VDIR ? CREATEDIR : 0), 3957 topb); 3958 if ((error = namei(&tond)) != 0) { 3959 VFS_RENAMELOCK_EXIT(fs); 3960 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3961 vrele(fromnd.ni_dvp); 3962 vrele(fvp); 3963 goto out1; 3964 } 3965 tdvp = tond.ni_dvp; 3966 tvp = tond.ni_vp; 3967 3968 if (tvp != NULL) { 3969 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3970 error = ENOTDIR; 3971 goto out; 3972 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3973 error = EISDIR; 3974 goto out; 3975 } 3976 } 3977 3978 if (fvp == tdvp) 3979 error = EINVAL; 3980 3981 /* 3982 * Source and destination refer to the same object. 3983 */ 3984 if (fvp == tvp) { 3985 if (retain) 3986 error = -1; 3987 else if (fromnd.ni_dvp == tdvp && 3988 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3989 !memcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 3990 fromnd.ni_cnd.cn_namelen)) 3991 error = -1; 3992 } 3993 /* 3994 * Prevent cross-mount operation. 3995 */ 3996 if (error == 0) { 3997 if (tond.ni_dvp->v_mount != fromnd.ni_dvp->v_mount) { 3998 error = EXDEV; 3999 } 4000 } 4001 #if NVERIEXEC > 0 4002 if (!error) { 4003 char *f1, *f2; 4004 size_t f1_len; 4005 size_t f2_len; 4006 4007 f1_len = fromnd.ni_cnd.cn_namelen + 1; 4008 f1 = kmem_alloc(f1_len, KM_SLEEP); 4009 strlcpy(f1, fromnd.ni_cnd.cn_nameptr, f1_len); 4010 4011 f2_len = tond.ni_cnd.cn_namelen + 1; 4012 f2 = kmem_alloc(f2_len, KM_SLEEP); 4013 strlcpy(f2, tond.ni_cnd.cn_nameptr, f2_len); 4014 4015 error = veriexec_renamechk(curlwp, fvp, f1, tvp, f2); 4016 4017 kmem_free(f1, f1_len); 4018 kmem_free(f2, f2_len); 4019 } 4020 #endif /* NVERIEXEC > 0 */ 4021 4022 out: 4023 if (!error) { 4024 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 4025 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 4026 VFS_RENAMELOCK_EXIT(fs); 4027 } else { 4028 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 4029 if (tdvp == tvp) 4030 vrele(tdvp); 4031 else 4032 vput(tdvp); 4033 if (tvp) 4034 vput(tvp); 4035 VFS_RENAMELOCK_EXIT(fs); 4036 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 4037 vrele(fromnd.ni_dvp); 4038 vrele(fvp); 4039 } 4040 out1: 4041 pathbuf_destroy(frompb); 4042 pathbuf_destroy(topb); 4043 return (error == -1 ? 0 : error); 4044 } 4045 4046 /* 4047 * Make a directory file. 4048 */ 4049 /* ARGSUSED */ 4050 int 4051 sys_mkdir(struct lwp *l, const struct sys_mkdir_args *uap, register_t *retval) 4052 { 4053 /* { 4054 syscallarg(const char *) path; 4055 syscallarg(int) mode; 4056 } */ 4057 4058 return do_sys_mkdir(SCARG(uap, path), SCARG(uap, mode), UIO_USERSPACE); 4059 } 4060 4061 int 4062 sys_mkdirat(struct lwp *l, const struct sys_mkdirat_args *uap, 4063 register_t *retval) 4064 { 4065 /* { 4066 syscallarg(int) fd; 4067 syscallarg(const char *) path; 4068 syscallarg(int) mode; 4069 } */ 4070 4071 return ENOSYS; 4072 } 4073 4074 4075 int 4076 do_sys_mkdir(const char *path, mode_t mode, enum uio_seg seg) 4077 { 4078 struct proc *p = curlwp->l_proc; 4079 struct vnode *vp; 4080 struct vattr vattr; 4081 int error; 4082 struct pathbuf *pb; 4083 struct nameidata nd; 4084 4085 /* XXX bollocks, should pass in a pathbuf */ 4086 error = pathbuf_maybe_copyin(path, seg, &pb); 4087 if (error) { 4088 return error; 4089 } 4090 4091 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT, pb); 4092 if ((error = namei(&nd)) != 0) { 4093 pathbuf_destroy(pb); 4094 return (error); 4095 } 4096 vp = nd.ni_vp; 4097 if (vp != NULL) { 4098 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 4099 if (nd.ni_dvp == vp) 4100 vrele(nd.ni_dvp); 4101 else 4102 vput(nd.ni_dvp); 4103 vrele(vp); 4104 pathbuf_destroy(pb); 4105 return (EEXIST); 4106 } 4107 vattr_null(&vattr); 4108 vattr.va_type = VDIR; 4109 /* We will read cwdi->cwdi_cmask unlocked. */ 4110 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 4111 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 4112 if (!error) 4113 vput(nd.ni_vp); 4114 pathbuf_destroy(pb); 4115 return (error); 4116 } 4117 4118 /* 4119 * Remove a directory file. 4120 */ 4121 /* ARGSUSED */ 4122 int 4123 sys_rmdir(struct lwp *l, const struct sys_rmdir_args *uap, register_t *retval) 4124 { 4125 /* { 4126 syscallarg(const char *) path; 4127 } */ 4128 struct vnode *vp; 4129 int error; 4130 struct pathbuf *pb; 4131 struct nameidata nd; 4132 4133 error = pathbuf_copyin(SCARG(uap, path), &pb); 4134 if (error) { 4135 return error; 4136 } 4137 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, pb); 4138 if ((error = namei(&nd)) != 0) { 4139 pathbuf_destroy(pb); 4140 return error; 4141 } 4142 vp = nd.ni_vp; 4143 if (vp->v_type != VDIR) { 4144 error = ENOTDIR; 4145 goto out; 4146 } 4147 /* 4148 * No rmdir "." please. 4149 */ 4150 if (nd.ni_dvp == vp) { 4151 error = EINVAL; 4152 goto out; 4153 } 4154 /* 4155 * The root of a mounted filesystem cannot be deleted. 4156 */ 4157 if ((vp->v_vflag & VV_ROOT) != 0 || vp->v_mountedhere != NULL) { 4158 error = EBUSY; 4159 goto out; 4160 } 4161 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 4162 pathbuf_destroy(pb); 4163 return (error); 4164 4165 out: 4166 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 4167 if (nd.ni_dvp == vp) 4168 vrele(nd.ni_dvp); 4169 else 4170 vput(nd.ni_dvp); 4171 vput(vp); 4172 pathbuf_destroy(pb); 4173 return (error); 4174 } 4175 4176 /* 4177 * Read a block of directory entries in a file system independent format. 4178 */ 4179 int 4180 sys___getdents30(struct lwp *l, const struct sys___getdents30_args *uap, register_t *retval) 4181 { 4182 /* { 4183 syscallarg(int) fd; 4184 syscallarg(char *) buf; 4185 syscallarg(size_t) count; 4186 } */ 4187 file_t *fp; 4188 int error, done; 4189 4190 /* fd_getvnode() will use the descriptor for us */ 4191 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4192 return (error); 4193 if ((fp->f_flag & FREAD) == 0) { 4194 error = EBADF; 4195 goto out; 4196 } 4197 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 4198 SCARG(uap, count), &done, l, 0, 0); 4199 ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, buf), done, error); 4200 *retval = done; 4201 out: 4202 fd_putfile(SCARG(uap, fd)); 4203 return (error); 4204 } 4205 4206 /* 4207 * Set the mode mask for creation of filesystem nodes. 4208 */ 4209 int 4210 sys_umask(struct lwp *l, const struct sys_umask_args *uap, register_t *retval) 4211 { 4212 /* { 4213 syscallarg(mode_t) newmask; 4214 } */ 4215 struct proc *p = l->l_proc; 4216 struct cwdinfo *cwdi; 4217 4218 /* 4219 * cwdi->cwdi_cmask will be read unlocked elsewhere. What's 4220 * important is that we serialize changes to the mask. The 4221 * rw_exit() will issue a write memory barrier on our behalf, 4222 * and force the changes out to other CPUs (as it must use an 4223 * atomic operation, draining the local CPU's store buffers). 4224 */ 4225 cwdi = p->p_cwdi; 4226 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 4227 *retval = cwdi->cwdi_cmask; 4228 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 4229 rw_exit(&cwdi->cwdi_lock); 4230 4231 return (0); 4232 } 4233 4234 int 4235 dorevoke(struct vnode *vp, kauth_cred_t cred) 4236 { 4237 struct vattr vattr; 4238 int error, fs_decision; 4239 4240 vn_lock(vp, LK_SHARED | LK_RETRY); 4241 error = VOP_GETATTR(vp, &vattr, cred); 4242 VOP_UNLOCK(vp); 4243 if (error != 0) 4244 return error; 4245 fs_decision = (kauth_cred_geteuid(cred) == vattr.va_uid) ? 0 : EPERM; 4246 error = kauth_authorize_vnode(cred, KAUTH_VNODE_REVOKE, vp, NULL, 4247 fs_decision); 4248 if (!error) 4249 VOP_REVOKE(vp, REVOKEALL); 4250 return (error); 4251 } 4252 4253 /* 4254 * Void all references to file by ripping underlying filesystem 4255 * away from vnode. 4256 */ 4257 /* ARGSUSED */ 4258 int 4259 sys_revoke(struct lwp *l, const struct sys_revoke_args *uap, register_t *retval) 4260 { 4261 /* { 4262 syscallarg(const char *) path; 4263 } */ 4264 struct vnode *vp; 4265 int error; 4266 4267 error = namei_simple_user(SCARG(uap, path), 4268 NSM_FOLLOW_TRYEMULROOT, &vp); 4269 if (error != 0) 4270 return (error); 4271 error = dorevoke(vp, l->l_cred); 4272 vrele(vp); 4273 return (error); 4274 } 4275
Indexes created Fri Sep 26 08:10:20 GMT 2025