vfs_syscalls.c revision 1.549.4.1
1 /* $NetBSD: vfs_syscalls.c,v 1.549.4.1 2021/08/01 22:42:39 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2009, 2019, 2020 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 1.549.4.1 2021/08/01 22:42:39 thorpej 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/fstrans.h> 91 #include <sys/proc.h> 92 #include <sys/uio.h> 93 #include <sys/kmem.h> 94 #include <sys/dirent.h> 95 #include <sys/sysctl.h> 96 #include <sys/syscallargs.h> 97 #include <sys/vfs_syscalls.h> 98 #include <sys/quota.h> 99 #include <sys/quotactl.h> 100 #include <sys/ktrace.h> 101 #ifdef FILEASSOC 102 #include <sys/fileassoc.h> 103 #endif /* FILEASSOC */ 104 #include <sys/extattr.h> 105 #include <sys/verified_exec.h> 106 #include <sys/kauth.h> 107 #include <sys/atomic.h> 108 #include <sys/module.h> 109 #include <sys/buf.h> 110 #include <sys/event.h> 111 #include <sys/compat_stub.h> 112 113 #include <miscfs/genfs/genfs.h> 114 #include <miscfs/specfs/specdev.h> 115 116 #include <nfs/rpcv2.h> 117 #include <nfs/nfsproto.h> 118 #include <nfs/nfs.h> 119 #include <nfs/nfs_var.h> 120 121 /* XXX this shouldn't be here */ 122 #ifndef OFF_T_MAX 123 #define OFF_T_MAX __type_max(off_t) 124 #endif 125 126 static int change_flags(struct vnode *, u_long, struct lwp *); 127 static int change_mode(struct vnode *, int, struct lwp *); 128 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); 129 static int do_sys_openat(lwp_t *, int, const char *, int, int, int *); 130 static int do_sys_mkdirat(struct lwp *l, int, const char *, mode_t, 131 enum uio_seg); 132 static int do_sys_mkfifoat(struct lwp *, int, const char *, mode_t); 133 static int do_sys_symlinkat(struct lwp *, const char *, int, const char *, 134 enum uio_seg); 135 static int do_sys_renameat(struct lwp *l, int, const char *, int, const char *, 136 enum uio_seg, int); 137 static int do_sys_readlinkat(struct lwp *, int, const char *, char *, 138 size_t, register_t *); 139 static int do_sys_unlinkat(struct lwp *, int, const char *, int, enum uio_seg); 140 141 static int fd_nameiat(struct lwp *, int, struct nameidata *); 142 static int fd_nameiat_simple_user(struct lwp *, int, const char *, 143 namei_simple_flags_t, struct vnode **); 144 145 /* 146 * This table is used to maintain compatibility with 4.3BSD 147 * and NetBSD 0.9 mount syscalls - and possibly other systems. 148 * Note, the order is important! 149 * 150 * Do not modify this table. It should only contain filesystems 151 * supported by NetBSD 0.9 and 4.3BSD. 152 */ 153 const char * const mountcompatnames[] = { 154 NULL, /* 0 = MOUNT_NONE */ 155 MOUNT_FFS, /* 1 = MOUNT_UFS */ 156 MOUNT_NFS, /* 2 */ 157 MOUNT_MFS, /* 3 */ 158 MOUNT_MSDOS, /* 4 */ 159 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 160 MOUNT_FDESC, /* 6 */ 161 MOUNT_KERNFS, /* 7 */ 162 NULL, /* 8 = MOUNT_DEVFS */ 163 MOUNT_AFS, /* 9 */ 164 }; 165 166 const u_int nmountcompatnames = __arraycount(mountcompatnames); 167 168 static int 169 fd_nameiat(struct lwp *l, int fdat, struct nameidata *ndp) 170 { 171 file_t *dfp; 172 int error; 173 174 if (fdat != AT_FDCWD) { 175 if ((error = fd_getvnode(fdat, &dfp)) != 0) 176 goto out; 177 178 NDAT(ndp, dfp->f_vnode); 179 } 180 181 error = namei(ndp); 182 183 if (fdat != AT_FDCWD) 184 fd_putfile(fdat); 185 out: 186 return error; 187 } 188 189 static int 190 fd_nameiat_simple_user(struct lwp *l, int fdat, const char *path, 191 namei_simple_flags_t sflags, struct vnode **vp_ret) 192 { 193 file_t *dfp; 194 struct vnode *dvp; 195 int error; 196 197 if (fdat != AT_FDCWD) { 198 if ((error = fd_getvnode(fdat, &dfp)) != 0) 199 goto out; 200 201 dvp = dfp->f_vnode; 202 } else { 203 dvp = NULL; 204 } 205 206 error = nameiat_simple_user(dvp, path, sflags, vp_ret); 207 208 if (fdat != AT_FDCWD) 209 fd_putfile(fdat); 210 out: 211 return error; 212 } 213 214 static int 215 open_setfp(struct lwp *l, file_t *fp, struct vnode *vp, int indx, int flags) 216 { 217 int error; 218 219 fp->f_flag = flags & FMASK; 220 fp->f_type = DTYPE_VNODE; 221 fp->f_ops = &vnops; 222 fp->f_vnode = vp; 223 224 if (flags & (O_EXLOCK | O_SHLOCK)) { 225 struct flock lf; 226 int type; 227 228 lf.l_whence = SEEK_SET; 229 lf.l_start = 0; 230 lf.l_len = 0; 231 if (flags & O_EXLOCK) 232 lf.l_type = F_WRLCK; 233 else 234 lf.l_type = F_RDLCK; 235 type = F_FLOCK; 236 if ((flags & FNONBLOCK) == 0) 237 type |= F_WAIT; 238 VOP_UNLOCK(vp); 239 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 240 if (error) { 241 (void) vn_close(vp, fp->f_flag, fp->f_cred); 242 fd_abort(l->l_proc, fp, indx); 243 return error; 244 } 245 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 246 atomic_or_uint(&fp->f_flag, FHASLOCK); 247 } 248 if (flags & O_CLOEXEC) 249 fd_set_exclose(l, indx, true); 250 return 0; 251 } 252 253 static int 254 mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags, 255 void *data, size_t *data_len) 256 { 257 struct mount *mp; 258 int error = 0, saved_flags; 259 260 mp = vp->v_mount; 261 saved_flags = mp->mnt_flag; 262 263 /* We can operate only on VV_ROOT nodes. */ 264 if ((vp->v_vflag & VV_ROOT) == 0) { 265 error = EINVAL; 266 goto out; 267 } 268 269 /* 270 * We only allow the filesystem to be reloaded if it 271 * is currently mounted read-only. Additionally, we 272 * prevent read-write to read-only downgrades. 273 */ 274 if ((flags & (MNT_RELOAD | MNT_RDONLY)) != 0 && 275 (mp->mnt_flag & MNT_RDONLY) == 0 && 276 (mp->mnt_iflag & IMNT_CAN_RWTORO) == 0) { 277 error = EOPNOTSUPP; /* Needs translation */ 278 goto out; 279 } 280 281 /* 282 * Enabling MNT_UNION requires a covered mountpoint and 283 * must not happen on the root mount. 284 */ 285 if ((flags & MNT_UNION) != 0 && mp->mnt_vnodecovered == NULLVP) { 286 error = EOPNOTSUPP; 287 goto out; 288 } 289 290 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 291 KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data); 292 if (error) 293 goto out; 294 295 error = vfs_suspend(mp, 0); 296 if (error) 297 goto out; 298 299 mutex_enter(mp->mnt_updating); 300 301 mp->mnt_flag &= ~MNT_OP_FLAGS; 302 mp->mnt_flag |= flags & MNT_OP_FLAGS; 303 304 /* 305 * Set the mount level flags. 306 */ 307 if ((flags & MNT_RDONLY) != (mp->mnt_flag & MNT_RDONLY)) { 308 if ((flags & MNT_RDONLY)) 309 mp->mnt_iflag |= IMNT_WANTRDONLY; 310 else 311 mp->mnt_iflag |= IMNT_WANTRDWR; 312 } 313 mp->mnt_flag &= ~MNT_BASIC_FLAGS; 314 mp->mnt_flag |= flags & MNT_BASIC_FLAGS; 315 if ((mp->mnt_iflag & IMNT_WANTRDONLY)) 316 mp->mnt_flag &= ~MNT_RDONLY; 317 318 error = VFS_MOUNT(mp, path, data, data_len); 319 320 if (error && data != NULL) { 321 int error2; 322 323 /* 324 * Update failed; let's try and see if it was an 325 * export request. For compat with 3.0 and earlier. 326 */ 327 error2 = vfs_hooks_reexport(mp, path, data); 328 329 /* 330 * Only update error code if the export request was 331 * understood but some problem occurred while 332 * processing it. 333 */ 334 if (error2 != EJUSTRETURN) 335 error = error2; 336 } 337 338 if (error == 0 && (mp->mnt_iflag & IMNT_WANTRDONLY)) 339 mp->mnt_flag |= MNT_RDONLY; 340 if (error) 341 mp->mnt_flag = saved_flags; 342 mp->mnt_flag &= ~MNT_OP_FLAGS; 343 mp->mnt_iflag &= ~(IMNT_WANTRDONLY | IMNT_WANTRDWR); 344 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 345 if ((mp->mnt_iflag & IMNT_ONWORKLIST) == 0) 346 vfs_syncer_add_to_worklist(mp); 347 } else { 348 if ((mp->mnt_iflag & IMNT_ONWORKLIST) != 0) 349 vfs_syncer_remove_from_worklist(mp); 350 } 351 mutex_exit(mp->mnt_updating); 352 vfs_resume(mp); 353 354 if ((error == 0) && !(saved_flags & MNT_EXTATTR) && 355 (flags & MNT_EXTATTR)) { 356 if (VFS_EXTATTRCTL(mp, EXTATTR_CMD_START, 357 NULL, 0, NULL) != 0) { 358 printf("%s: failed to start extattr, error = %d", 359 mp->mnt_stat.f_mntonname, error); 360 mp->mnt_flag &= ~MNT_EXTATTR; 361 } 362 } 363 364 if ((error == 0) && (saved_flags & MNT_EXTATTR) && 365 !(flags & MNT_EXTATTR)) { 366 if (VFS_EXTATTRCTL(mp, EXTATTR_CMD_STOP, 367 NULL, 0, NULL) != 0) { 368 printf("%s: failed to stop extattr, error = %d", 369 mp->mnt_stat.f_mntonname, error); 370 mp->mnt_flag |= MNT_RDONLY; 371 } 372 } 373 out: 374 return (error); 375 } 376 377 static int 378 mount_get_vfsops(const char *fstype, enum uio_seg type_seg, 379 struct vfsops **vfsops) 380 { 381 char fstypename[sizeof(((struct statvfs *)NULL)->f_fstypename)]; 382 int error; 383 384 if (type_seg == UIO_USERSPACE) { 385 /* Copy file-system type from userspace. */ 386 error = copyinstr(fstype, fstypename, sizeof(fstypename), NULL); 387 } else { 388 error = copystr(fstype, fstypename, sizeof(fstypename), NULL); 389 KASSERT(error == 0); 390 } 391 392 if (error) { 393 /* 394 * Historically, filesystem types were identified by numbers. 395 * If we get an integer for the filesystem type instead of a 396 * string, we check to see if it matches one of the historic 397 * filesystem types. 398 */ 399 u_long fsindex = (u_long)fstype; 400 if (fsindex >= nmountcompatnames || 401 mountcompatnames[fsindex] == NULL) 402 return ENODEV; 403 strlcpy(fstypename, mountcompatnames[fsindex], 404 sizeof(fstypename)); 405 } 406 407 /* Accept `ufs' as an alias for `ffs', for compatibility. */ 408 if (strcmp(fstypename, "ufs") == 0) 409 fstypename[0] = 'f'; 410 411 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 412 return 0; 413 414 /* If we can autoload a vfs module, try again */ 415 (void)module_autoload(fstypename, MODULE_CLASS_VFS); 416 417 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 418 return 0; 419 420 return ENODEV; 421 } 422 423 static int 424 mount_getargs(struct lwp *l, struct vnode *vp, const char *path, int flags, 425 void *data, size_t *data_len) 426 { 427 struct mount *mp; 428 int error; 429 430 /* If MNT_GETARGS is specified, it should be the only flag. */ 431 if (flags & ~MNT_GETARGS) 432 return EINVAL; 433 434 mp = vp->v_mount; 435 436 /* XXX: probably some notion of "can see" here if we want isolation. */ 437 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 438 KAUTH_REQ_SYSTEM_MOUNT_GET, mp, data, NULL); 439 if (error) 440 return error; 441 442 if ((vp->v_vflag & VV_ROOT) == 0) 443 return EINVAL; 444 445 if (vfs_busy(mp)) 446 return EPERM; 447 448 mutex_enter(mp->mnt_updating); 449 mp->mnt_flag &= ~MNT_OP_FLAGS; 450 mp->mnt_flag |= MNT_GETARGS; 451 error = VFS_MOUNT(mp, path, data, data_len); 452 mp->mnt_flag &= ~MNT_OP_FLAGS; 453 mutex_exit(mp->mnt_updating); 454 455 vfs_unbusy(mp); 456 return (error); 457 } 458 459 int 460 sys___mount50(struct lwp *l, const struct sys___mount50_args *uap, register_t *retval) 461 { 462 /* { 463 syscallarg(const char *) type; 464 syscallarg(const char *) path; 465 syscallarg(int) flags; 466 syscallarg(void *) data; 467 syscallarg(size_t) data_len; 468 } */ 469 470 return do_sys_mount(l, SCARG(uap, type), UIO_USERSPACE, SCARG(uap, path), 471 SCARG(uap, flags), SCARG(uap, data), UIO_USERSPACE, 472 SCARG(uap, data_len), retval); 473 } 474 475 int 476 do_sys_mount(struct lwp *l, const char *type, enum uio_seg type_seg, 477 const char *path, int flags, void *data, enum uio_seg data_seg, 478 size_t data_len, register_t *retval) 479 { 480 struct vfsops *vfsops = NULL; /* XXX gcc4.8 */ 481 struct vnode *vp; 482 void *data_buf = data; 483 bool vfsopsrele = false; 484 size_t alloc_sz = 0; 485 int error; 486 487 /* 488 * Get vnode to be covered 489 */ 490 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 491 if (error != 0) { 492 vp = NULL; 493 goto done; 494 } 495 496 if (flags & (MNT_GETARGS | MNT_UPDATE)) { 497 vfsops = vp->v_mount->mnt_op; 498 } else { 499 /* 'type' is userspace */ 500 error = mount_get_vfsops(type, type_seg, &vfsops); 501 if (error != 0) 502 goto done; 503 vfsopsrele = true; 504 } 505 506 /* 507 * We allow data to be NULL, even for userspace. Some fs's don't need 508 * it. The others will handle NULL. 509 */ 510 if (data != NULL && data_seg == UIO_USERSPACE) { 511 if (data_len == 0) { 512 /* No length supplied, use default for filesystem */ 513 data_len = vfsops->vfs_min_mount_data; 514 515 /* 516 * Hopefully a longer buffer won't make copyin() fail. 517 * For compatibility with 3.0 and earlier. 518 */ 519 if (flags & MNT_UPDATE 520 && data_len < sizeof (struct mnt_export_args30)) 521 data_len = sizeof (struct mnt_export_args30); 522 } 523 if ((data_len == 0) || (data_len > VFS_MAX_MOUNT_DATA)) { 524 error = EINVAL; 525 goto done; 526 } 527 alloc_sz = data_len; 528 data_buf = kmem_alloc(alloc_sz, KM_SLEEP); 529 530 /* NFS needs the buffer even for mnt_getargs .... */ 531 error = copyin(data, data_buf, data_len); 532 if (error != 0) 533 goto done; 534 } 535 536 if (flags & MNT_GETARGS) { 537 if (data_len == 0) { 538 error = EINVAL; 539 goto done; 540 } 541 error = mount_getargs(l, vp, path, flags, data_buf, &data_len); 542 if (error != 0) 543 goto done; 544 if (data_seg == UIO_USERSPACE) 545 error = copyout(data_buf, data, data_len); 546 *retval = data_len; 547 } else if (flags & MNT_UPDATE) { 548 error = mount_update(l, vp, path, flags, data_buf, &data_len); 549 } else { 550 /* Locking is handled internally in mount_domount(). */ 551 KASSERT(vfsopsrele == true); 552 error = mount_domount(l, &vp, vfsops, path, flags, data_buf, 553 &data_len); 554 vfsopsrele = false; 555 } 556 if (!error) 557 KNOTE(&fs_klist, VQ_MOUNT); 558 559 done: 560 if (vfsopsrele) 561 vfs_delref(vfsops); 562 if (vp != NULL) { 563 vrele(vp); 564 } 565 if (data_buf != data) 566 kmem_free(data_buf, alloc_sz); 567 return (error); 568 } 569 570 /* 571 * Unmount a file system. 572 * 573 * Note: unmount takes a path to the vnode mounted on as argument, 574 * not special file (as before). 575 */ 576 /* ARGSUSED */ 577 int 578 sys_unmount(struct lwp *l, const struct sys_unmount_args *uap, register_t *retval) 579 { 580 /* { 581 syscallarg(const char *) path; 582 syscallarg(int) flags; 583 } */ 584 struct vnode *vp; 585 struct mount *mp; 586 int error; 587 struct pathbuf *pb; 588 struct nameidata nd; 589 590 error = pathbuf_copyin(SCARG(uap, path), &pb); 591 if (error) { 592 return error; 593 } 594 595 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, pb); 596 if ((error = namei(&nd)) != 0) { 597 pathbuf_destroy(pb); 598 return error; 599 } 600 vp = nd.ni_vp; 601 pathbuf_destroy(pb); 602 603 mp = vp->v_mount; 604 vfs_ref(mp); 605 VOP_UNLOCK(vp); 606 607 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 608 KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT, mp, NULL, NULL); 609 if (error) { 610 vrele(vp); 611 vfs_rele(mp); 612 return (error); 613 } 614 615 /* 616 * Don't allow unmounting the root file system. 617 */ 618 if (mp->mnt_flag & MNT_ROOTFS) { 619 vrele(vp); 620 vfs_rele(mp); 621 return (EINVAL); 622 } 623 624 /* 625 * Must be the root of the filesystem 626 */ 627 if ((vp->v_vflag & VV_ROOT) == 0) { 628 vrele(vp); 629 vfs_rele(mp); 630 return (EINVAL); 631 } 632 633 vrele(vp); 634 error = dounmount(mp, SCARG(uap, flags), l); 635 vfs_rele(mp); 636 if (!error) 637 KNOTE(&fs_klist, VQ_UNMOUNT); 638 return error; 639 } 640 641 /* 642 * Sync each mounted filesystem. 643 */ 644 #ifdef DEBUG 645 int syncprt = 0; 646 struct ctldebug debug0 = { "syncprt", &syncprt }; 647 #endif 648 649 void 650 do_sys_sync(struct lwp *l) 651 { 652 mount_iterator_t *iter; 653 struct mount *mp; 654 int asyncflag; 655 656 mountlist_iterator_init(&iter); 657 while ((mp = mountlist_iterator_next(iter)) != NULL) { 658 mutex_enter(mp->mnt_updating); 659 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 660 asyncflag = mp->mnt_flag & MNT_ASYNC; 661 mp->mnt_flag &= ~MNT_ASYNC; 662 VFS_SYNC(mp, MNT_NOWAIT, l->l_cred); 663 if (asyncflag) 664 mp->mnt_flag |= MNT_ASYNC; 665 } 666 mutex_exit(mp->mnt_updating); 667 } 668 mountlist_iterator_destroy(iter); 669 #ifdef DEBUG 670 if (syncprt) 671 vfs_bufstats(); 672 #endif /* DEBUG */ 673 } 674 675 static bool 676 sync_vnode_filter(void *cookie, vnode_t *vp) 677 { 678 679 if (vp->v_numoutput > 0) { 680 ++*(int *)cookie; 681 } 682 return false; 683 } 684 685 int 686 vfs_syncwait(void) 687 { 688 int nbusy, nbusy_prev, iter; 689 struct vnode_iterator *vniter; 690 mount_iterator_t *mpiter; 691 struct mount *mp; 692 693 for (nbusy_prev = 0, iter = 0; iter < 20;) { 694 nbusy = 0; 695 mountlist_iterator_init(&mpiter); 696 while ((mp = mountlist_iterator_next(mpiter)) != NULL) { 697 vnode_t *vp __diagused; 698 vfs_vnode_iterator_init(mp, &vniter); 699 vp = vfs_vnode_iterator_next(vniter, 700 sync_vnode_filter, &nbusy); 701 KASSERT(vp == NULL); 702 vfs_vnode_iterator_destroy(vniter); 703 } 704 mountlist_iterator_destroy(mpiter); 705 706 if (nbusy == 0) 707 break; 708 if (nbusy_prev == 0) 709 nbusy_prev = nbusy; 710 printf("%d ", nbusy); 711 kpause("syncwait", false, MAX(1, hz / 25 * iter), NULL); 712 if (nbusy >= nbusy_prev) /* we didn't flush anything */ 713 iter++; 714 else 715 nbusy_prev = nbusy; 716 } 717 718 if (nbusy) { 719 #if defined(DEBUG) || defined(DEBUG_HALT_BUSY) 720 printf("giving up\nPrinting vnodes for busy buffers\n"); 721 mountlist_iterator_init(&mpiter); 722 while ((mp = mountlist_iterator_next(mpiter)) != NULL) { 723 vnode_t *vp; 724 vfs_vnode_iterator_init(mp, &vniter); 725 vp = vfs_vnode_iterator_next(vniter, 726 NULL, NULL); 727 mutex_enter(vp->v_interlock); 728 if (vp->v_numoutput > 0) 729 vprint(NULL, vp); 730 mutex_exit(vp->v_interlock); 731 vrele(vp); 732 vfs_vnode_iterator_destroy(vniter); 733 } 734 mountlist_iterator_destroy(mpiter); 735 #endif 736 } 737 738 return nbusy; 739 } 740 741 /* ARGSUSED */ 742 int 743 sys_sync(struct lwp *l, const void *v, register_t *retval) 744 { 745 do_sys_sync(l); 746 return (0); 747 } 748 749 750 /* 751 * Access or change filesystem quotas. 752 * 753 * (this is really 14 different calls bundled into one) 754 */ 755 756 static int 757 do_sys_quotactl_stat(struct mount *mp, struct quotastat *info_u) 758 { 759 struct quotastat info_k; 760 int error; 761 762 /* ensure any padding bytes are cleared */ 763 memset(&info_k, 0, sizeof(info_k)); 764 765 error = vfs_quotactl_stat(mp, &info_k); 766 if (error) { 767 return error; 768 } 769 770 return copyout(&info_k, info_u, sizeof(info_k)); 771 } 772 773 static int 774 do_sys_quotactl_idtypestat(struct mount *mp, int idtype, 775 struct quotaidtypestat *info_u) 776 { 777 struct quotaidtypestat info_k; 778 int error; 779 780 /* ensure any padding bytes are cleared */ 781 memset(&info_k, 0, sizeof(info_k)); 782 783 error = vfs_quotactl_idtypestat(mp, idtype, &info_k); 784 if (error) { 785 return error; 786 } 787 788 return copyout(&info_k, info_u, sizeof(info_k)); 789 } 790 791 static int 792 do_sys_quotactl_objtypestat(struct mount *mp, int objtype, 793 struct quotaobjtypestat *info_u) 794 { 795 struct quotaobjtypestat info_k; 796 int error; 797 798 /* ensure any padding bytes are cleared */ 799 memset(&info_k, 0, sizeof(info_k)); 800 801 error = vfs_quotactl_objtypestat(mp, objtype, &info_k); 802 if (error) { 803 return error; 804 } 805 806 return copyout(&info_k, info_u, sizeof(info_k)); 807 } 808 809 static int 810 do_sys_quotactl_get(struct mount *mp, const struct quotakey *key_u, 811 struct quotaval *val_u) 812 { 813 struct quotakey key_k; 814 struct quotaval val_k; 815 int error; 816 817 /* ensure any padding bytes are cleared */ 818 memset(&val_k, 0, sizeof(val_k)); 819 820 error = copyin(key_u, &key_k, sizeof(key_k)); 821 if (error) { 822 return error; 823 } 824 825 error = vfs_quotactl_get(mp, &key_k, &val_k); 826 if (error) { 827 return error; 828 } 829 830 return copyout(&val_k, val_u, sizeof(val_k)); 831 } 832 833 static int 834 do_sys_quotactl_put(struct mount *mp, const struct quotakey *key_u, 835 const struct quotaval *val_u) 836 { 837 struct quotakey key_k; 838 struct quotaval val_k; 839 int error; 840 841 error = copyin(key_u, &key_k, sizeof(key_k)); 842 if (error) { 843 return error; 844 } 845 846 error = copyin(val_u, &val_k, sizeof(val_k)); 847 if (error) { 848 return error; 849 } 850 851 return vfs_quotactl_put(mp, &key_k, &val_k); 852 } 853 854 static int 855 do_sys_quotactl_del(struct mount *mp, const struct quotakey *key_u) 856 { 857 struct quotakey key_k; 858 int error; 859 860 error = copyin(key_u, &key_k, sizeof(key_k)); 861 if (error) { 862 return error; 863 } 864 865 return vfs_quotactl_del(mp, &key_k); 866 } 867 868 static int 869 do_sys_quotactl_cursoropen(struct mount *mp, struct quotakcursor *cursor_u) 870 { 871 struct quotakcursor cursor_k; 872 int error; 873 874 /* ensure any padding bytes are cleared */ 875 memset(&cursor_k, 0, sizeof(cursor_k)); 876 877 error = vfs_quotactl_cursoropen(mp, &cursor_k); 878 if (error) { 879 return error; 880 } 881 882 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 883 } 884 885 static int 886 do_sys_quotactl_cursorclose(struct mount *mp, struct quotakcursor *cursor_u) 887 { 888 struct quotakcursor cursor_k; 889 int error; 890 891 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 892 if (error) { 893 return error; 894 } 895 896 return vfs_quotactl_cursorclose(mp, &cursor_k); 897 } 898 899 static int 900 do_sys_quotactl_cursorskipidtype(struct mount *mp, 901 struct quotakcursor *cursor_u, int idtype) 902 { 903 struct quotakcursor cursor_k; 904 int error; 905 906 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 907 if (error) { 908 return error; 909 } 910 911 error = vfs_quotactl_cursorskipidtype(mp, &cursor_k, idtype); 912 if (error) { 913 return error; 914 } 915 916 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 917 } 918 919 static int 920 do_sys_quotactl_cursorget(struct mount *mp, struct quotakcursor *cursor_u, 921 struct quotakey *keys_u, struct quotaval *vals_u, unsigned maxnum, 922 unsigned *ret_u) 923 { 924 #define CGET_STACK_MAX 8 925 struct quotakcursor cursor_k; 926 struct quotakey stackkeys[CGET_STACK_MAX]; 927 struct quotaval stackvals[CGET_STACK_MAX]; 928 struct quotakey *keys_k; 929 struct quotaval *vals_k; 930 unsigned ret_k; 931 int error; 932 933 if (maxnum > 128) { 934 maxnum = 128; 935 } 936 937 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 938 if (error) { 939 return error; 940 } 941 942 if (maxnum <= CGET_STACK_MAX) { 943 keys_k = stackkeys; 944 vals_k = stackvals; 945 /* ensure any padding bytes are cleared */ 946 memset(keys_k, 0, maxnum * sizeof(keys_k[0])); 947 memset(vals_k, 0, maxnum * sizeof(vals_k[0])); 948 } else { 949 keys_k = kmem_zalloc(maxnum * sizeof(keys_k[0]), KM_SLEEP); 950 vals_k = kmem_zalloc(maxnum * sizeof(vals_k[0]), KM_SLEEP); 951 } 952 953 error = vfs_quotactl_cursorget(mp, &cursor_k, keys_k, vals_k, maxnum, 954 &ret_k); 955 if (error) { 956 goto fail; 957 } 958 959 error = copyout(keys_k, keys_u, ret_k * sizeof(keys_k[0])); 960 if (error) { 961 goto fail; 962 } 963 964 error = copyout(vals_k, vals_u, ret_k * sizeof(vals_k[0])); 965 if (error) { 966 goto fail; 967 } 968 969 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 970 if (error) { 971 goto fail; 972 } 973 974 /* do last to maximize the chance of being able to recover a failure */ 975 error = copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 976 977 fail: 978 if (keys_k != stackkeys) { 979 kmem_free(keys_k, maxnum * sizeof(keys_k[0])); 980 } 981 if (vals_k != stackvals) { 982 kmem_free(vals_k, maxnum * sizeof(vals_k[0])); 983 } 984 return error; 985 } 986 987 static int 988 do_sys_quotactl_cursoratend(struct mount *mp, struct quotakcursor *cursor_u, 989 int *ret_u) 990 { 991 struct quotakcursor cursor_k; 992 int ret_k; 993 int error; 994 995 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 996 if (error) { 997 return error; 998 } 999 1000 error = vfs_quotactl_cursoratend(mp, &cursor_k, &ret_k); 1001 if (error) { 1002 return error; 1003 } 1004 1005 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 1006 if (error) { 1007 return error; 1008 } 1009 1010 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 1011 } 1012 1013 static int 1014 do_sys_quotactl_cursorrewind(struct mount *mp, struct quotakcursor *cursor_u) 1015 { 1016 struct quotakcursor cursor_k; 1017 int error; 1018 1019 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 1020 if (error) { 1021 return error; 1022 } 1023 1024 error = vfs_quotactl_cursorrewind(mp, &cursor_k); 1025 if (error) { 1026 return error; 1027 } 1028 1029 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 1030 } 1031 1032 static int 1033 do_sys_quotactl_quotaon(struct mount *mp, int idtype, const char *path_u) 1034 { 1035 char *path_k; 1036 int error; 1037 1038 /* XXX this should probably be a struct pathbuf */ 1039 path_k = PNBUF_GET(); 1040 error = copyin(path_u, path_k, PATH_MAX); 1041 if (error) { 1042 PNBUF_PUT(path_k); 1043 return error; 1044 } 1045 1046 error = vfs_quotactl_quotaon(mp, idtype, path_k); 1047 1048 PNBUF_PUT(path_k); 1049 return error; 1050 } 1051 1052 static int 1053 do_sys_quotactl_quotaoff(struct mount *mp, int idtype) 1054 { 1055 return vfs_quotactl_quotaoff(mp, idtype); 1056 } 1057 1058 int 1059 do_sys_quotactl(const char *path_u, const struct quotactl_args *args) 1060 { 1061 struct mount *mp; 1062 struct vnode *vp; 1063 int error; 1064 1065 error = namei_simple_user(path_u, NSM_FOLLOW_TRYEMULROOT, &vp); 1066 if (error != 0) 1067 return (error); 1068 mp = vp->v_mount; 1069 1070 switch (args->qc_op) { 1071 case QUOTACTL_STAT: 1072 error = do_sys_quotactl_stat(mp, args->u.stat.qc_info); 1073 break; 1074 case QUOTACTL_IDTYPESTAT: 1075 error = do_sys_quotactl_idtypestat(mp, 1076 args->u.idtypestat.qc_idtype, 1077 args->u.idtypestat.qc_info); 1078 break; 1079 case QUOTACTL_OBJTYPESTAT: 1080 error = do_sys_quotactl_objtypestat(mp, 1081 args->u.objtypestat.qc_objtype, 1082 args->u.objtypestat.qc_info); 1083 break; 1084 case QUOTACTL_GET: 1085 error = do_sys_quotactl_get(mp, 1086 args->u.get.qc_key, 1087 args->u.get.qc_val); 1088 break; 1089 case QUOTACTL_PUT: 1090 error = do_sys_quotactl_put(mp, 1091 args->u.put.qc_key, 1092 args->u.put.qc_val); 1093 break; 1094 case QUOTACTL_DEL: 1095 error = do_sys_quotactl_del(mp, args->u.del.qc_key); 1096 break; 1097 case QUOTACTL_CURSOROPEN: 1098 error = do_sys_quotactl_cursoropen(mp, 1099 args->u.cursoropen.qc_cursor); 1100 break; 1101 case QUOTACTL_CURSORCLOSE: 1102 error = do_sys_quotactl_cursorclose(mp, 1103 args->u.cursorclose.qc_cursor); 1104 break; 1105 case QUOTACTL_CURSORSKIPIDTYPE: 1106 error = do_sys_quotactl_cursorskipidtype(mp, 1107 args->u.cursorskipidtype.qc_cursor, 1108 args->u.cursorskipidtype.qc_idtype); 1109 break; 1110 case QUOTACTL_CURSORGET: 1111 error = do_sys_quotactl_cursorget(mp, 1112 args->u.cursorget.qc_cursor, 1113 args->u.cursorget.qc_keys, 1114 args->u.cursorget.qc_vals, 1115 args->u.cursorget.qc_maxnum, 1116 args->u.cursorget.qc_ret); 1117 break; 1118 case QUOTACTL_CURSORATEND: 1119 error = do_sys_quotactl_cursoratend(mp, 1120 args->u.cursoratend.qc_cursor, 1121 args->u.cursoratend.qc_ret); 1122 break; 1123 case QUOTACTL_CURSORREWIND: 1124 error = do_sys_quotactl_cursorrewind(mp, 1125 args->u.cursorrewind.qc_cursor); 1126 break; 1127 case QUOTACTL_QUOTAON: 1128 error = do_sys_quotactl_quotaon(mp, 1129 args->u.quotaon.qc_idtype, 1130 args->u.quotaon.qc_quotafile); 1131 break; 1132 case QUOTACTL_QUOTAOFF: 1133 error = do_sys_quotactl_quotaoff(mp, 1134 args->u.quotaoff.qc_idtype); 1135 break; 1136 default: 1137 error = EINVAL; 1138 break; 1139 } 1140 1141 vrele(vp); 1142 return error; 1143 } 1144 1145 /* ARGSUSED */ 1146 int 1147 sys___quotactl(struct lwp *l, const struct sys___quotactl_args *uap, 1148 register_t *retval) 1149 { 1150 /* { 1151 syscallarg(const char *) path; 1152 syscallarg(struct quotactl_args *) args; 1153 } */ 1154 struct quotactl_args args; 1155 int error; 1156 1157 error = copyin(SCARG(uap, args), &args, sizeof(args)); 1158 if (error) { 1159 return error; 1160 } 1161 1162 return do_sys_quotactl(SCARG(uap, path), &args); 1163 } 1164 1165 int 1166 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 1167 int root) 1168 { 1169 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 1170 bool chrooted; 1171 int error = 0; 1172 1173 KASSERT(l == curlwp); 1174 1175 /* 1176 * This is safe unlocked. cwdi_rdir never goes non-NULL -> NULL, 1177 * since it would imply chroots can be escaped. Just make sure this 1178 * routine is self-consistent. 1179 */ 1180 chrooted = (atomic_load_relaxed(&cwdi->cwdi_rdir) != NULL); 1181 1182 /* 1183 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1184 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 1185 * overrides MNT_NOWAIT. 1186 */ 1187 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 1188 (flags != MNT_WAIT && flags != 0)) { 1189 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 1190 } else { 1191 /* Get the filesystem stats now */ 1192 memset(sp, 0, sizeof(*sp)); 1193 if ((error = VFS_STATVFS(mp, sp)) != 0) 1194 return error; 1195 if (!chrooted) 1196 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 1197 } 1198 1199 if (chrooted) { 1200 size_t len; 1201 char *bp; 1202 char c; 1203 char *path = PNBUF_GET(); 1204 1205 bp = path + MAXPATHLEN; 1206 *--bp = '\0'; 1207 rw_enter(&cwdi->cwdi_lock, RW_READER); 1208 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 1209 MAXPATHLEN / 2, 0, l); 1210 rw_exit(&cwdi->cwdi_lock); 1211 if (error) { 1212 PNBUF_PUT(path); 1213 return error; 1214 } 1215 len = strlen(bp); 1216 if (len != 1) { 1217 /* 1218 * for mount points that are below our root, we can see 1219 * them, so we fix up the pathname and return them. The 1220 * rest we cannot see, so we don't allow viewing the 1221 * data. 1222 */ 1223 if (strncmp(bp, sp->f_mntonname, len) == 0 && 1224 ((c = sp->f_mntonname[len]) == '/' || c == '\0')) { 1225 (void)strlcpy(sp->f_mntonname, 1226 c == '\0' ? "/" : &sp->f_mntonname[len], 1227 sizeof(sp->f_mntonname)); 1228 } else { 1229 if (root) 1230 (void)strlcpy(sp->f_mntonname, "/", 1231 sizeof(sp->f_mntonname)); 1232 else 1233 error = EPERM; 1234 } 1235 } 1236 PNBUF_PUT(path); 1237 } 1238 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 1239 return error; 1240 } 1241 1242 /* 1243 * Get filesystem statistics by path. 1244 */ 1245 int 1246 do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb) 1247 { 1248 struct mount *mp; 1249 int error; 1250 struct vnode *vp; 1251 1252 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 1253 if (error != 0) 1254 return error; 1255 mp = vp->v_mount; 1256 error = dostatvfs(mp, sb, l, flags, 1); 1257 vrele(vp); 1258 return error; 1259 } 1260 1261 /* ARGSUSED */ 1262 int 1263 sys___statvfs190(struct lwp *l, const struct sys___statvfs190_args *uap, register_t *retval) 1264 { 1265 /* { 1266 syscallarg(const char *) path; 1267 syscallarg(struct statvfs *) buf; 1268 syscallarg(int) flags; 1269 } */ 1270 struct statvfs *sb; 1271 int error; 1272 1273 sb = STATVFSBUF_GET(); 1274 error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb); 1275 if (error == 0) 1276 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1277 STATVFSBUF_PUT(sb); 1278 return error; 1279 } 1280 1281 /* 1282 * Get filesystem statistics by fd. 1283 */ 1284 int 1285 do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb) 1286 { 1287 file_t *fp; 1288 struct mount *mp; 1289 int error; 1290 1291 /* fd_getvnode() will use the descriptor for us */ 1292 if ((error = fd_getvnode(fd, &fp)) != 0) 1293 return (error); 1294 mp = fp->f_vnode->v_mount; 1295 error = dostatvfs(mp, sb, curlwp, flags, 1); 1296 fd_putfile(fd); 1297 return error; 1298 } 1299 1300 /* ARGSUSED */ 1301 int 1302 sys___fstatvfs190(struct lwp *l, const struct sys___fstatvfs190_args *uap, register_t *retval) 1303 { 1304 /* { 1305 syscallarg(int) fd; 1306 syscallarg(struct statvfs *) buf; 1307 syscallarg(int) flags; 1308 } */ 1309 struct statvfs *sb; 1310 int error; 1311 1312 sb = STATVFSBUF_GET(); 1313 error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb); 1314 if (error == 0) 1315 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1316 STATVFSBUF_PUT(sb); 1317 return error; 1318 } 1319 1320 1321 /* 1322 * Get statistics on all filesystems. 1323 */ 1324 int 1325 do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags, 1326 int (*copyfn)(const void *, void *, size_t), size_t entry_sz, 1327 register_t *retval) 1328 { 1329 int root = 0; 1330 mount_iterator_t *iter; 1331 struct proc *p = l->l_proc; 1332 struct mount *mp; 1333 struct statvfs *sb; 1334 size_t count, maxcount; 1335 int error = 0; 1336 1337 sb = STATVFSBUF_GET(); 1338 maxcount = bufsize / entry_sz; 1339 count = 0; 1340 mountlist_iterator_init(&iter); 1341 while ((mp = mountlist_iterator_next(iter)) != NULL) { 1342 if (sfsp && count < maxcount) { 1343 error = dostatvfs(mp, sb, l, flags, 0); 1344 if (error) { 1345 error = 0; 1346 continue; 1347 } 1348 error = copyfn(sb, sfsp, entry_sz); 1349 if (error) 1350 goto out; 1351 sfsp = (char *)sfsp + entry_sz; 1352 root |= strcmp(sb->f_mntonname, "/") == 0; 1353 } 1354 count++; 1355 } 1356 1357 if (root == 0 && p->p_cwdi->cwdi_rdir) { 1358 /* 1359 * fake a root entry 1360 */ 1361 error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, 1362 sb, l, flags, 1); 1363 if (error != 0) 1364 goto out; 1365 if (sfsp) { 1366 error = copyfn(sb, sfsp, entry_sz); 1367 if (error != 0) 1368 goto out; 1369 } 1370 count++; 1371 } 1372 if (sfsp && count > maxcount) 1373 *retval = maxcount; 1374 else 1375 *retval = count; 1376 out: 1377 mountlist_iterator_destroy(iter); 1378 STATVFSBUF_PUT(sb); 1379 return error; 1380 } 1381 1382 int 1383 sys___getvfsstat90(struct lwp *l, const struct sys___getvfsstat90_args *uap, 1384 register_t *retval) 1385 { 1386 /* { 1387 syscallarg(struct statvfs *) buf; 1388 syscallarg(size_t) bufsize; 1389 syscallarg(int) flags; 1390 } */ 1391 1392 return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize), 1393 SCARG(uap, flags), copyout, sizeof (struct statvfs), retval); 1394 } 1395 1396 /* 1397 * Change current working directory to a given file descriptor. 1398 */ 1399 /* ARGSUSED */ 1400 int 1401 sys_fchdir(struct lwp *l, const struct sys_fchdir_args *uap, register_t *retval) 1402 { 1403 /* { 1404 syscallarg(int) fd; 1405 } */ 1406 struct proc *p = l->l_proc; 1407 struct cwdinfo *cwdi; 1408 struct vnode *vp, *tdp; 1409 struct mount *mp; 1410 file_t *fp; 1411 int error, fd; 1412 1413 /* fd_getvnode() will use the descriptor for us */ 1414 fd = SCARG(uap, fd); 1415 if ((error = fd_getvnode(fd, &fp)) != 0) 1416 return (error); 1417 vp = fp->f_vnode; 1418 1419 vref(vp); 1420 vn_lock(vp, LK_SHARED | LK_RETRY); 1421 if (vp->v_type != VDIR) 1422 error = ENOTDIR; 1423 else 1424 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1425 if (error) { 1426 vput(vp); 1427 goto out; 1428 } 1429 while ((mp = vp->v_mountedhere) != NULL) { 1430 error = vfs_busy(mp); 1431 vput(vp); 1432 if (error != 0) 1433 goto out; 1434 error = VFS_ROOT(mp, LK_SHARED, &tdp); 1435 vfs_unbusy(mp); 1436 if (error) 1437 goto out; 1438 vp = tdp; 1439 } 1440 VOP_UNLOCK(vp); 1441 1442 /* 1443 * Disallow changing to a directory not under the process's 1444 * current root directory (if there is one). 1445 */ 1446 cwdi = p->p_cwdi; 1447 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1448 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 1449 vrele(vp); 1450 error = EPERM; /* operation not permitted */ 1451 } else { 1452 vrele(cwdi->cwdi_cdir); 1453 cwdi->cwdi_cdir = vp; 1454 } 1455 rw_exit(&cwdi->cwdi_lock); 1456 1457 out: 1458 fd_putfile(fd); 1459 return (error); 1460 } 1461 1462 /* 1463 * Change this process's notion of the root directory to a given file 1464 * descriptor. 1465 */ 1466 int 1467 sys_fchroot(struct lwp *l, const struct sys_fchroot_args *uap, register_t *retval) 1468 { 1469 struct vnode *vp; 1470 file_t *fp; 1471 int error, fd = SCARG(uap, fd); 1472 1473 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1474 KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) 1475 return error; 1476 /* fd_getvnode() will use the descriptor for us */ 1477 if ((error = fd_getvnode(fd, &fp)) != 0) 1478 return error; 1479 vp = fp->f_vnode; 1480 vn_lock(vp, LK_SHARED | LK_RETRY); 1481 if (vp->v_type != VDIR) 1482 error = ENOTDIR; 1483 else 1484 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1485 VOP_UNLOCK(vp); 1486 if (error) 1487 goto out; 1488 vref(vp); 1489 change_root(vp); 1490 1491 out: 1492 fd_putfile(fd); 1493 return (error); 1494 } 1495 1496 /* 1497 * Change current working directory (``.''). 1498 */ 1499 /* ARGSUSED */ 1500 int 1501 sys_chdir(struct lwp *l, const struct sys_chdir_args *uap, register_t *retval) 1502 { 1503 /* { 1504 syscallarg(const char *) path; 1505 } */ 1506 struct proc *p = l->l_proc; 1507 struct cwdinfo *cwdi; 1508 int error; 1509 struct vnode *vp; 1510 1511 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1512 &vp, l)) != 0) 1513 return (error); 1514 cwdi = p->p_cwdi; 1515 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1516 vrele(cwdi->cwdi_cdir); 1517 cwdi->cwdi_cdir = vp; 1518 rw_exit(&cwdi->cwdi_lock); 1519 return (0); 1520 } 1521 1522 /* 1523 * Change notion of root (``/'') directory. 1524 */ 1525 /* ARGSUSED */ 1526 int 1527 sys_chroot(struct lwp *l, const struct sys_chroot_args *uap, register_t *retval) 1528 { 1529 /* { 1530 syscallarg(const char *) path; 1531 } */ 1532 int error; 1533 struct vnode *vp; 1534 1535 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1536 KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) 1537 return (error); 1538 1539 error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, &vp, l); 1540 if (error == 0) 1541 change_root(vp); 1542 return error; 1543 } 1544 1545 /* 1546 * Common routine for chroot and fchroot. 1547 * NB: callers need to properly authorize the change root operation. 1548 */ 1549 void 1550 change_root(struct vnode *vp) 1551 { 1552 kauth_cred_t ncred; 1553 struct lwp *l = curlwp; 1554 struct proc *p = l->l_proc; 1555 struct cwdinfo *cwdi = p->p_cwdi; 1556 1557 ncred = kauth_cred_alloc(); 1558 1559 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1560 if (cwdi->cwdi_rdir != NULL) 1561 vrele(cwdi->cwdi_rdir); 1562 cwdi->cwdi_rdir = vp; 1563 1564 /* 1565 * Prevent escaping from chroot by putting the root under 1566 * the working directory. Silently chdir to / if we aren't 1567 * already there. 1568 */ 1569 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1570 /* 1571 * XXX would be more failsafe to change directory to a 1572 * deadfs node here instead 1573 */ 1574 vrele(cwdi->cwdi_cdir); 1575 vref(vp); 1576 cwdi->cwdi_cdir = vp; 1577 } 1578 rw_exit(&cwdi->cwdi_lock); 1579 1580 /* Get a write lock on the process credential. */ 1581 proc_crmod_enter(); 1582 1583 kauth_cred_clone(p->p_cred, ncred); 1584 kauth_proc_chroot(ncred, p->p_cwdi); 1585 1586 /* Broadcast our credentials to the process and other LWPs. */ 1587 proc_crmod_leave(ncred, p->p_cred, true); 1588 } 1589 1590 /* 1591 * Common routine for chroot and chdir. 1592 * XXX "where" should be enum uio_seg 1593 */ 1594 int 1595 chdir_lookup(const char *path, int where, struct vnode **vpp, struct lwp *l) 1596 { 1597 struct pathbuf *pb; 1598 struct nameidata nd; 1599 int error; 1600 1601 error = pathbuf_maybe_copyin(path, where, &pb); 1602 if (error) { 1603 return error; 1604 } 1605 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | LOCKSHARED | TRYEMULROOT, pb); 1606 if ((error = namei(&nd)) != 0) { 1607 pathbuf_destroy(pb); 1608 return error; 1609 } 1610 *vpp = nd.ni_vp; 1611 pathbuf_destroy(pb); 1612 1613 if ((*vpp)->v_type != VDIR) 1614 error = ENOTDIR; 1615 else 1616 error = VOP_ACCESS(*vpp, VEXEC, l->l_cred); 1617 1618 if (error) 1619 vput(*vpp); 1620 else 1621 VOP_UNLOCK(*vpp); 1622 return (error); 1623 } 1624 1625 /* 1626 * Internals of sys_open - path has already been converted into a pathbuf 1627 * (so we can easily reuse this function from other parts of the kernel, 1628 * like posix_spawn post-processing). 1629 */ 1630 int 1631 do_open(lwp_t *l, struct vnode *dvp, struct pathbuf *pb, int open_flags, 1632 int open_mode, int *fd) 1633 { 1634 struct proc *p = l->l_proc; 1635 struct cwdinfo *cwdi = p->p_cwdi; 1636 file_t *fp; 1637 struct vnode *vp; 1638 int dupfd; 1639 bool dupfd_move; 1640 int flags, cmode; 1641 int indx, error; 1642 1643 if (open_flags & O_SEARCH) { 1644 open_flags &= ~(int)O_SEARCH; 1645 } 1646 1647 /* 1648 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1649 * may be specified. 1650 */ 1651 if ((open_flags & O_EXEC) && (open_flags & O_ACCMODE)) 1652 return EINVAL; 1653 1654 flags = FFLAGS(open_flags); 1655 if ((flags & (FREAD | FWRITE)) == 0) 1656 return EINVAL; 1657 1658 if ((error = fd_allocfile(&fp, &indx)) != 0) { 1659 return error; 1660 } 1661 1662 /* We're going to read cwdi->cwdi_cmask unlocked here. */ 1663 cmode = ((open_mode &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1664 1665 error = vn_open(dvp, pb, TRYEMULROOT, flags, cmode, 1666 &vp, &dupfd_move, &dupfd); 1667 if (error != 0) { 1668 fd_abort(p, fp, indx); 1669 if (error == ERESTART) 1670 error = EINTR; 1671 return error; 1672 } 1673 1674 if (vp == NULL) { 1675 fd_abort(p, fp, indx); 1676 error = fd_dupopen(dupfd, dupfd_move, flags, &indx); 1677 if (error) 1678 return error; 1679 *fd = indx; 1680 } else { 1681 error = open_setfp(l, fp, vp, indx, flags); 1682 if (error) 1683 return error; 1684 VOP_UNLOCK(vp); 1685 *fd = indx; 1686 fd_affix(p, fp, indx); 1687 } 1688 1689 return 0; 1690 } 1691 1692 int 1693 fd_open(const char *path, int open_flags, int open_mode, int *fd) 1694 { 1695 struct pathbuf *pb; 1696 int error, oflags; 1697 1698 oflags = FFLAGS(open_flags); 1699 if ((oflags & (FREAD | FWRITE)) == 0) 1700 return EINVAL; 1701 1702 pb = pathbuf_create(path); 1703 if (pb == NULL) 1704 return ENOMEM; 1705 1706 error = do_open(curlwp, NULL, pb, open_flags, open_mode, fd); 1707 pathbuf_destroy(pb); 1708 1709 return error; 1710 } 1711 1712 static int 1713 do_sys_openat(lwp_t *l, int fdat, const char *path, int flags, 1714 int mode, int *fd) 1715 { 1716 file_t *dfp = NULL; 1717 struct vnode *dvp = NULL; 1718 struct pathbuf *pb; 1719 const char *pathstring = NULL; 1720 int error; 1721 1722 if (path == NULL) { 1723 MODULE_HOOK_CALL(vfs_openat_10_hook, (&pb), enosys(), error); 1724 if (error == ENOSYS) 1725 goto no_compat; 1726 if (error) 1727 return error; 1728 } else { 1729 no_compat: 1730 error = pathbuf_copyin(path, &pb); 1731 if (error) 1732 return error; 1733 } 1734 1735 pathstring = pathbuf_stringcopy_get(pb); 1736 1737 /* 1738 * fdat is ignored if: 1739 * 1) if fdat is AT_FDCWD, which means use current directory as base. 1740 * 2) if path is absolute, then fdat is useless. 1741 */ 1742 if (fdat != AT_FDCWD && pathstring[0] != '/') { 1743 /* fd_getvnode() will use the descriptor for us */ 1744 if ((error = fd_getvnode(fdat, &dfp)) != 0) 1745 goto out; 1746 1747 dvp = dfp->f_vnode; 1748 } 1749 1750 error = do_open(l, dvp, pb, flags, mode, fd); 1751 1752 if (dfp != NULL) 1753 fd_putfile(fdat); 1754 out: 1755 pathbuf_stringcopy_put(pb, pathstring); 1756 pathbuf_destroy(pb); 1757 return error; 1758 } 1759 1760 int 1761 sys_open(struct lwp *l, const struct sys_open_args *uap, register_t *retval) 1762 { 1763 /* { 1764 syscallarg(const char *) path; 1765 syscallarg(int) flags; 1766 syscallarg(int) mode; 1767 } */ 1768 int error; 1769 int fd; 1770 1771 error = do_sys_openat(l, AT_FDCWD, SCARG(uap, path), 1772 SCARG(uap, flags), SCARG(uap, mode), &fd); 1773 1774 if (error == 0) 1775 *retval = fd; 1776 1777 return error; 1778 } 1779 1780 int 1781 sys_openat(struct lwp *l, const struct sys_openat_args *uap, register_t *retval) 1782 { 1783 /* { 1784 syscallarg(int) fd; 1785 syscallarg(const char *) path; 1786 syscallarg(int) oflags; 1787 syscallarg(int) mode; 1788 } */ 1789 int error; 1790 int fd; 1791 1792 error = do_sys_openat(l, SCARG(uap, fd), SCARG(uap, path), 1793 SCARG(uap, oflags), SCARG(uap, mode), &fd); 1794 1795 if (error == 0) 1796 *retval = fd; 1797 1798 return error; 1799 } 1800 1801 static void 1802 vfs__fhfree(fhandle_t *fhp) 1803 { 1804 size_t fhsize; 1805 1806 fhsize = FHANDLE_SIZE(fhp); 1807 kmem_free(fhp, fhsize); 1808 } 1809 1810 /* 1811 * vfs_composefh: compose a filehandle. 1812 */ 1813 1814 int 1815 vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) 1816 { 1817 struct mount *mp; 1818 struct fid *fidp; 1819 int error; 1820 size_t needfhsize; 1821 size_t fidsize; 1822 1823 mp = vp->v_mount; 1824 fidp = NULL; 1825 if (*fh_size < FHANDLE_SIZE_MIN) { 1826 fidsize = 0; 1827 } else { 1828 fidsize = *fh_size - offsetof(fhandle_t, fh_fid); 1829 if (fhp != NULL) { 1830 memset(fhp, 0, *fh_size); 1831 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1832 fidp = &fhp->fh_fid; 1833 } 1834 } 1835 error = VFS_VPTOFH(vp, fidp, &fidsize); 1836 needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1837 if (error == 0 && *fh_size < needfhsize) { 1838 error = E2BIG; 1839 } 1840 *fh_size = needfhsize; 1841 return error; 1842 } 1843 1844 int 1845 vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) 1846 { 1847 struct mount *mp; 1848 fhandle_t *fhp; 1849 size_t fhsize; 1850 size_t fidsize; 1851 int error; 1852 1853 mp = vp->v_mount; 1854 fidsize = 0; 1855 error = VFS_VPTOFH(vp, NULL, &fidsize); 1856 KASSERT(error != 0); 1857 if (error != E2BIG) { 1858 goto out; 1859 } 1860 fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1861 fhp = kmem_zalloc(fhsize, KM_SLEEP); 1862 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1863 error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); 1864 if (error == 0) { 1865 KASSERT((FHANDLE_SIZE(fhp) == fhsize && 1866 FHANDLE_FILEID(fhp)->fid_len == fidsize)); 1867 *fhpp = fhp; 1868 } else { 1869 kmem_free(fhp, fhsize); 1870 } 1871 out: 1872 return error; 1873 } 1874 1875 void 1876 vfs_composefh_free(fhandle_t *fhp) 1877 { 1878 1879 vfs__fhfree(fhp); 1880 } 1881 1882 /* 1883 * vfs_fhtovp: lookup a vnode by a filehandle. 1884 */ 1885 1886 int 1887 vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) 1888 { 1889 struct mount *mp; 1890 int error; 1891 1892 *vpp = NULL; 1893 mp = vfs_getvfs(FHANDLE_FSID(fhp)); 1894 if (mp == NULL) { 1895 error = ESTALE; 1896 goto out; 1897 } 1898 if (mp->mnt_op->vfs_fhtovp == NULL) { 1899 error = EOPNOTSUPP; 1900 goto out; 1901 } 1902 error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), LK_EXCLUSIVE, vpp); 1903 out: 1904 return error; 1905 } 1906 1907 /* 1908 * vfs_copyinfh_alloc: allocate and copyin a filehandle, given 1909 * the needed size. 1910 */ 1911 1912 int 1913 vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) 1914 { 1915 fhandle_t *fhp; 1916 int error; 1917 1918 if (fhsize > FHANDLE_SIZE_MAX) { 1919 return EINVAL; 1920 } 1921 if (fhsize < FHANDLE_SIZE_MIN) { 1922 return EINVAL; 1923 } 1924 again: 1925 fhp = kmem_alloc(fhsize, KM_SLEEP); 1926 error = copyin(ufhp, fhp, fhsize); 1927 if (error == 0) { 1928 /* XXX this check shouldn't be here */ 1929 if (FHANDLE_SIZE(fhp) == fhsize) { 1930 *fhpp = fhp; 1931 return 0; 1932 } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { 1933 /* 1934 * a kludge for nfsv2 padded handles. 1935 */ 1936 size_t sz; 1937 1938 sz = FHANDLE_SIZE(fhp); 1939 kmem_free(fhp, fhsize); 1940 fhsize = sz; 1941 goto again; 1942 } else { 1943 /* 1944 * userland told us wrong size. 1945 */ 1946 error = EINVAL; 1947 } 1948 } 1949 kmem_free(fhp, fhsize); 1950 return error; 1951 } 1952 1953 void 1954 vfs_copyinfh_free(fhandle_t *fhp) 1955 { 1956 1957 vfs__fhfree(fhp); 1958 } 1959 1960 /* 1961 * Get file handle system call 1962 */ 1963 int 1964 sys___getfh30(struct lwp *l, const struct sys___getfh30_args *uap, register_t *retval) 1965 { 1966 /* { 1967 syscallarg(char *) fname; 1968 syscallarg(fhandle_t *) fhp; 1969 syscallarg(size_t *) fh_size; 1970 } */ 1971 struct vnode *vp; 1972 fhandle_t *fh; 1973 int error; 1974 struct pathbuf *pb; 1975 struct nameidata nd; 1976 size_t sz; 1977 size_t usz; 1978 1979 /* 1980 * Must be super user 1981 */ 1982 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1983 0, NULL, NULL, NULL); 1984 if (error) 1985 return (error); 1986 1987 error = pathbuf_copyin(SCARG(uap, fname), &pb); 1988 if (error) { 1989 return error; 1990 } 1991 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1992 error = namei(&nd); 1993 if (error) { 1994 pathbuf_destroy(pb); 1995 return error; 1996 } 1997 vp = nd.ni_vp; 1998 pathbuf_destroy(pb); 1999 2000 error = vfs_composefh_alloc(vp, &fh); 2001 vput(vp); 2002 if (error != 0) { 2003 return error; 2004 } 2005 error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); 2006 if (error != 0) { 2007 goto out; 2008 } 2009 sz = FHANDLE_SIZE(fh); 2010 error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); 2011 if (error != 0) { 2012 goto out; 2013 } 2014 if (usz >= sz) { 2015 error = copyout(fh, SCARG(uap, fhp), sz); 2016 } else { 2017 error = E2BIG; 2018 } 2019 out: 2020 vfs_composefh_free(fh); 2021 return (error); 2022 } 2023 2024 /* 2025 * Open a file given a file handle. 2026 * 2027 * Check permissions, allocate an open file structure, 2028 * and call the device open routine if any. 2029 */ 2030 2031 int 2032 dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, 2033 register_t *retval) 2034 { 2035 file_t *fp; 2036 struct vnode *vp = NULL; 2037 kauth_cred_t cred = l->l_cred; 2038 file_t *nfp; 2039 int indx, error; 2040 struct vattr va; 2041 fhandle_t *fh; 2042 int flags; 2043 proc_t *p; 2044 2045 p = curproc; 2046 2047 /* 2048 * Must be super user 2049 */ 2050 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2051 0, NULL, NULL, NULL))) 2052 return (error); 2053 2054 if (oflags & O_SEARCH) { 2055 oflags &= ~(int)O_SEARCH; 2056 } 2057 2058 flags = FFLAGS(oflags); 2059 if ((flags & (FREAD | FWRITE)) == 0) 2060 return (EINVAL); 2061 if ((flags & O_CREAT)) 2062 return (EINVAL); 2063 if ((error = fd_allocfile(&nfp, &indx)) != 0) 2064 return (error); 2065 fp = nfp; 2066 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2067 if (error != 0) { 2068 goto bad; 2069 } 2070 error = vfs_fhtovp(fh, &vp); 2071 vfs_copyinfh_free(fh); 2072 if (error != 0) { 2073 goto bad; 2074 } 2075 2076 /* Now do an effective vn_open */ 2077 2078 if (vp->v_type == VSOCK) { 2079 error = EOPNOTSUPP; 2080 goto bad; 2081 } 2082 error = vn_openchk(vp, cred, flags); 2083 if (error != 0) 2084 goto bad; 2085 if (flags & O_TRUNC) { 2086 VOP_UNLOCK(vp); /* XXX */ 2087 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 2088 vattr_null(&va); 2089 va.va_size = 0; 2090 error = VOP_SETATTR(vp, &va, cred); 2091 if (error) 2092 goto bad; 2093 } 2094 if ((error = VOP_OPEN(vp, flags, cred)) != 0) 2095 goto bad; 2096 if (flags & FWRITE) { 2097 mutex_enter(vp->v_interlock); 2098 vp->v_writecount++; 2099 mutex_exit(vp->v_interlock); 2100 } 2101 2102 /* done with modified vn_open, now finish what sys_open does. */ 2103 if ((error = open_setfp(l, fp, vp, indx, flags))) 2104 return error; 2105 2106 VOP_UNLOCK(vp); 2107 *retval = indx; 2108 fd_affix(p, fp, indx); 2109 return (0); 2110 2111 bad: 2112 fd_abort(p, fp, indx); 2113 if (vp != NULL) 2114 vput(vp); 2115 if (error == EDUPFD || error == EMOVEFD) { 2116 /* XXX should probably close curlwp->l_dupfd */ 2117 error = EOPNOTSUPP; 2118 } 2119 return (error); 2120 } 2121 2122 int 2123 sys___fhopen40(struct lwp *l, const struct sys___fhopen40_args *uap, register_t *retval) 2124 { 2125 /* { 2126 syscallarg(const void *) fhp; 2127 syscallarg(size_t) fh_size; 2128 syscallarg(int) flags; 2129 } */ 2130 2131 return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), 2132 SCARG(uap, flags), retval); 2133 } 2134 2135 int 2136 do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb) 2137 { 2138 int error; 2139 fhandle_t *fh; 2140 struct vnode *vp; 2141 2142 /* 2143 * Must be super user 2144 */ 2145 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2146 0, NULL, NULL, NULL))) 2147 return (error); 2148 2149 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2150 if (error != 0) 2151 return error; 2152 2153 error = vfs_fhtovp(fh, &vp); 2154 vfs_copyinfh_free(fh); 2155 if (error != 0) 2156 return error; 2157 2158 error = vn_stat(vp, sb); 2159 vput(vp); 2160 return error; 2161 } 2162 2163 2164 /* ARGSUSED */ 2165 int 2166 sys___fhstat50(struct lwp *l, const struct sys___fhstat50_args *uap, register_t *retval) 2167 { 2168 /* { 2169 syscallarg(const void *) fhp; 2170 syscallarg(size_t) fh_size; 2171 syscallarg(struct stat *) sb; 2172 } */ 2173 struct stat sb; 2174 int error; 2175 2176 error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb); 2177 if (error) 2178 return error; 2179 return copyout(&sb, SCARG(uap, sb), sizeof(sb)); 2180 } 2181 2182 int 2183 do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb, 2184 int flags) 2185 { 2186 fhandle_t *fh; 2187 struct mount *mp; 2188 struct vnode *vp; 2189 int error; 2190 2191 /* 2192 * Must be super user 2193 */ 2194 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2195 0, NULL, NULL, NULL))) 2196 return error; 2197 2198 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2199 if (error != 0) 2200 return error; 2201 2202 error = vfs_fhtovp(fh, &vp); 2203 vfs_copyinfh_free(fh); 2204 if (error != 0) 2205 return error; 2206 2207 mp = vp->v_mount; 2208 error = dostatvfs(mp, sb, l, flags, 1); 2209 vput(vp); 2210 return error; 2211 } 2212 2213 /* ARGSUSED */ 2214 int 2215 sys___fhstatvfs190(struct lwp *l, const struct sys___fhstatvfs190_args *uap, register_t *retval) 2216 { 2217 /* { 2218 syscallarg(const void *) fhp; 2219 syscallarg(size_t) fh_size; 2220 syscallarg(struct statvfs *) buf; 2221 syscallarg(int) flags; 2222 } */ 2223 struct statvfs *sb = STATVFSBUF_GET(); 2224 int error; 2225 2226 error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb, 2227 SCARG(uap, flags)); 2228 if (error == 0) 2229 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 2230 STATVFSBUF_PUT(sb); 2231 return error; 2232 } 2233 2234 int 2235 do_posix_mknodat(struct lwp *l, int fdat, const char *pathname, mode_t mode, 2236 dev_t dev) 2237 { 2238 2239 /* 2240 * The POSIX mknod(2) call is an alias for mkfifo(2) for S_IFIFO 2241 * in mode and dev=0. 2242 * 2243 * In all the other cases it's implementation defined behavior. 2244 */ 2245 2246 if ((mode & S_IFIFO) && dev == 0) 2247 return do_sys_mkfifoat(l, fdat, pathname, mode); 2248 else 2249 return do_sys_mknodat(l, fdat, pathname, mode, dev, 2250 UIO_USERSPACE); 2251 } 2252 2253 /* 2254 * Create a special file. 2255 */ 2256 /* ARGSUSED */ 2257 int 2258 sys___mknod50(struct lwp *l, const struct sys___mknod50_args *uap, 2259 register_t *retval) 2260 { 2261 /* { 2262 syscallarg(const char *) path; 2263 syscallarg(mode_t) mode; 2264 syscallarg(dev_t) dev; 2265 } */ 2266 return do_posix_mknodat(l, AT_FDCWD, SCARG(uap, path), 2267 SCARG(uap, mode), SCARG(uap, dev)); 2268 } 2269 2270 int 2271 sys_mknodat(struct lwp *l, const struct sys_mknodat_args *uap, 2272 register_t *retval) 2273 { 2274 /* { 2275 syscallarg(int) fd; 2276 syscallarg(const char *) path; 2277 syscallarg(mode_t) mode; 2278 syscallarg(int) pad; 2279 syscallarg(dev_t) dev; 2280 } */ 2281 2282 return do_posix_mknodat(l, SCARG(uap, fd), SCARG(uap, path), 2283 SCARG(uap, mode), SCARG(uap, dev)); 2284 } 2285 2286 int 2287 do_sys_mknod(struct lwp *l, const char *pathname, mode_t mode, dev_t dev, 2288 enum uio_seg seg) 2289 { 2290 return do_sys_mknodat(l, AT_FDCWD, pathname, mode, dev, seg); 2291 } 2292 2293 int 2294 do_sys_mknodat(struct lwp *l, int fdat, const char *pathname, mode_t mode, 2295 dev_t dev, enum uio_seg seg) 2296 { 2297 struct proc *p = l->l_proc; 2298 struct vnode *vp; 2299 struct vattr vattr; 2300 int error, optype; 2301 struct pathbuf *pb; 2302 struct nameidata nd; 2303 const char *pathstring; 2304 2305 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 2306 0, NULL, NULL, NULL)) != 0) 2307 return (error); 2308 2309 optype = VOP_MKNOD_DESCOFFSET; 2310 2311 error = pathbuf_maybe_copyin(pathname, seg, &pb); 2312 if (error) { 2313 return error; 2314 } 2315 pathstring = pathbuf_stringcopy_get(pb); 2316 if (pathstring == NULL) { 2317 pathbuf_destroy(pb); 2318 return ENOMEM; 2319 } 2320 2321 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2322 2323 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2324 goto out; 2325 vp = nd.ni_vp; 2326 2327 if (vp != NULL) 2328 error = EEXIST; 2329 else { 2330 vattr_null(&vattr); 2331 /* We will read cwdi->cwdi_cmask unlocked. */ 2332 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2333 vattr.va_rdev = dev; 2334 2335 switch (mode & S_IFMT) { 2336 case S_IFMT: /* used by badsect to flag bad sectors */ 2337 vattr.va_type = VBAD; 2338 break; 2339 case S_IFCHR: 2340 vattr.va_type = VCHR; 2341 break; 2342 case S_IFBLK: 2343 vattr.va_type = VBLK; 2344 break; 2345 case S_IFWHT: 2346 optype = VOP_WHITEOUT_DESCOFFSET; 2347 break; 2348 case S_IFREG: 2349 #if NVERIEXEC > 0 2350 error = veriexec_openchk(l, nd.ni_vp, pathstring, 2351 O_CREAT); 2352 #endif /* NVERIEXEC > 0 */ 2353 vattr.va_type = VREG; 2354 vattr.va_rdev = VNOVAL; 2355 optype = VOP_CREATE_DESCOFFSET; 2356 break; 2357 default: 2358 error = EINVAL; 2359 break; 2360 } 2361 2362 if (error == 0 && optype == VOP_MKNOD_DESCOFFSET && 2363 vattr.va_rdev == VNOVAL) 2364 error = EINVAL; 2365 } 2366 2367 if (!error) { 2368 switch (optype) { 2369 case VOP_WHITEOUT_DESCOFFSET: 2370 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 2371 if (error) 2372 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2373 vput(nd.ni_dvp); 2374 break; 2375 2376 case VOP_MKNOD_DESCOFFSET: 2377 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 2378 &nd.ni_cnd, &vattr); 2379 if (error == 0) 2380 vrele(nd.ni_vp); 2381 vput(nd.ni_dvp); 2382 break; 2383 2384 case VOP_CREATE_DESCOFFSET: 2385 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, 2386 &nd.ni_cnd, &vattr); 2387 if (error == 0) 2388 vrele(nd.ni_vp); 2389 vput(nd.ni_dvp); 2390 break; 2391 } 2392 } else { 2393 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2394 if (nd.ni_dvp == vp) 2395 vrele(nd.ni_dvp); 2396 else 2397 vput(nd.ni_dvp); 2398 if (vp) 2399 vrele(vp); 2400 } 2401 out: 2402 pathbuf_stringcopy_put(pb, pathstring); 2403 pathbuf_destroy(pb); 2404 return (error); 2405 } 2406 2407 /* 2408 * Create a named pipe. 2409 */ 2410 /* ARGSUSED */ 2411 int 2412 sys_mkfifo(struct lwp *l, const struct sys_mkfifo_args *uap, register_t *retval) 2413 { 2414 /* { 2415 syscallarg(const char *) path; 2416 syscallarg(int) mode; 2417 } */ 2418 return do_sys_mkfifoat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap, mode)); 2419 } 2420 2421 int 2422 sys_mkfifoat(struct lwp *l, const struct sys_mkfifoat_args *uap, 2423 register_t *retval) 2424 { 2425 /* { 2426 syscallarg(int) fd; 2427 syscallarg(const char *) path; 2428 syscallarg(int) mode; 2429 } */ 2430 2431 return do_sys_mkfifoat(l, SCARG(uap, fd), SCARG(uap, path), 2432 SCARG(uap, mode)); 2433 } 2434 2435 static int 2436 do_sys_mkfifoat(struct lwp *l, int fdat, const char *path, mode_t mode) 2437 { 2438 struct proc *p = l->l_proc; 2439 struct vattr vattr; 2440 int error; 2441 struct pathbuf *pb; 2442 struct nameidata nd; 2443 2444 error = pathbuf_copyin(path, &pb); 2445 if (error) { 2446 return error; 2447 } 2448 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2449 2450 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 2451 pathbuf_destroy(pb); 2452 return error; 2453 } 2454 if (nd.ni_vp != NULL) { 2455 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2456 if (nd.ni_dvp == nd.ni_vp) 2457 vrele(nd.ni_dvp); 2458 else 2459 vput(nd.ni_dvp); 2460 vrele(nd.ni_vp); 2461 pathbuf_destroy(pb); 2462 return (EEXIST); 2463 } 2464 vattr_null(&vattr); 2465 vattr.va_type = VFIFO; 2466 /* We will read cwdi->cwdi_cmask unlocked. */ 2467 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2468 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2469 if (error == 0) 2470 vrele(nd.ni_vp); 2471 vput(nd.ni_dvp); 2472 pathbuf_destroy(pb); 2473 return (error); 2474 } 2475 2476 /* 2477 * Make a hard file link. 2478 */ 2479 /* ARGSUSED */ 2480 int 2481 do_sys_linkat(struct lwp *l, int fdpath, const char *path, int fdlink, 2482 const char *link, int follow, register_t *retval) 2483 { 2484 struct vnode *vp; 2485 struct pathbuf *linkpb; 2486 struct nameidata nd; 2487 namei_simple_flags_t ns_flags; 2488 int error; 2489 2490 if (follow & AT_SYMLINK_FOLLOW) 2491 ns_flags = NSM_FOLLOW_TRYEMULROOT; 2492 else 2493 ns_flags = NSM_NOFOLLOW_TRYEMULROOT; 2494 2495 error = fd_nameiat_simple_user(l, fdpath, path, ns_flags, &vp); 2496 if (error != 0) 2497 return (error); 2498 error = pathbuf_copyin(link, &linkpb); 2499 if (error) { 2500 goto out1; 2501 } 2502 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2503 if ((error = fd_nameiat(l, fdlink, &nd)) != 0) 2504 goto out2; 2505 if (nd.ni_vp) { 2506 error = EEXIST; 2507 goto abortop; 2508 } 2509 /* Prevent hard links on directories. */ 2510 if (vp->v_type == VDIR) { 2511 error = EPERM; 2512 goto abortop; 2513 } 2514 /* Prevent cross-mount operation. */ 2515 if (nd.ni_dvp->v_mount != vp->v_mount) { 2516 error = EXDEV; 2517 goto abortop; 2518 } 2519 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 2520 VOP_UNLOCK(nd.ni_dvp); 2521 vrele(nd.ni_dvp); 2522 out2: 2523 pathbuf_destroy(linkpb); 2524 out1: 2525 vrele(vp); 2526 return (error); 2527 abortop: 2528 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2529 if (nd.ni_dvp == nd.ni_vp) 2530 vrele(nd.ni_dvp); 2531 else 2532 vput(nd.ni_dvp); 2533 if (nd.ni_vp != NULL) 2534 vrele(nd.ni_vp); 2535 goto out2; 2536 } 2537 2538 int 2539 sys_link(struct lwp *l, const struct sys_link_args *uap, register_t *retval) 2540 { 2541 /* { 2542 syscallarg(const char *) path; 2543 syscallarg(const char *) link; 2544 } */ 2545 const char *path = SCARG(uap, path); 2546 const char *link = SCARG(uap, link); 2547 2548 return do_sys_linkat(l, AT_FDCWD, path, AT_FDCWD, link, 2549 AT_SYMLINK_FOLLOW, retval); 2550 } 2551 2552 int 2553 sys_linkat(struct lwp *l, const struct sys_linkat_args *uap, 2554 register_t *retval) 2555 { 2556 /* { 2557 syscallarg(int) fd1; 2558 syscallarg(const char *) name1; 2559 syscallarg(int) fd2; 2560 syscallarg(const char *) name2; 2561 syscallarg(int) flags; 2562 } */ 2563 int fd1 = SCARG(uap, fd1); 2564 const char *name1 = SCARG(uap, name1); 2565 int fd2 = SCARG(uap, fd2); 2566 const char *name2 = SCARG(uap, name2); 2567 int follow; 2568 2569 follow = SCARG(uap, flags) & AT_SYMLINK_FOLLOW; 2570 2571 return do_sys_linkat(l, fd1, name1, fd2, name2, follow, retval); 2572 } 2573 2574 2575 int 2576 do_sys_symlink(const char *patharg, const char *link, enum uio_seg seg) 2577 { 2578 return do_sys_symlinkat(NULL, patharg, AT_FDCWD, link, seg); 2579 } 2580 2581 static int 2582 do_sys_symlinkat(struct lwp *l, const char *patharg, int fdat, 2583 const char *link, enum uio_seg seg) 2584 { 2585 struct proc *p = curproc; 2586 struct vattr vattr; 2587 char *path; 2588 int error; 2589 size_t len; 2590 struct pathbuf *linkpb; 2591 struct nameidata nd; 2592 2593 KASSERT(l != NULL || fdat == AT_FDCWD); 2594 2595 path = PNBUF_GET(); 2596 if (seg == UIO_USERSPACE) { 2597 if ((error = copyinstr(patharg, path, MAXPATHLEN, &len)) != 0) 2598 goto out1; 2599 if ((error = pathbuf_copyin(link, &linkpb)) != 0) 2600 goto out1; 2601 } else { 2602 len = strlen(patharg) + 1; 2603 KASSERT(len <= MAXPATHLEN); 2604 memcpy(path, patharg, len); 2605 linkpb = pathbuf_create(link); 2606 if (linkpb == NULL) { 2607 error = ENOMEM; 2608 goto out1; 2609 } 2610 } 2611 ktrkuser("symlink-target", path, len - 1); 2612 2613 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2614 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2615 goto out2; 2616 if (nd.ni_vp) { 2617 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2618 if (nd.ni_dvp == nd.ni_vp) 2619 vrele(nd.ni_dvp); 2620 else 2621 vput(nd.ni_dvp); 2622 vrele(nd.ni_vp); 2623 error = EEXIST; 2624 goto out2; 2625 } 2626 vattr_null(&vattr); 2627 vattr.va_type = VLNK; 2628 /* We will read cwdi->cwdi_cmask unlocked. */ 2629 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 2630 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 2631 if (error == 0) 2632 vrele(nd.ni_vp); 2633 vput(nd.ni_dvp); 2634 out2: 2635 pathbuf_destroy(linkpb); 2636 out1: 2637 PNBUF_PUT(path); 2638 return (error); 2639 } 2640 2641 /* 2642 * Make a symbolic link. 2643 */ 2644 /* ARGSUSED */ 2645 int 2646 sys_symlink(struct lwp *l, const struct sys_symlink_args *uap, register_t *retval) 2647 { 2648 /* { 2649 syscallarg(const char *) path; 2650 syscallarg(const char *) link; 2651 } */ 2652 2653 return do_sys_symlinkat(l, SCARG(uap, path), AT_FDCWD, SCARG(uap, link), 2654 UIO_USERSPACE); 2655 } 2656 2657 int 2658 sys_symlinkat(struct lwp *l, const struct sys_symlinkat_args *uap, 2659 register_t *retval) 2660 { 2661 /* { 2662 syscallarg(const char *) path1; 2663 syscallarg(int) fd; 2664 syscallarg(const char *) path2; 2665 } */ 2666 2667 return do_sys_symlinkat(l, SCARG(uap, path1), SCARG(uap, fd), 2668 SCARG(uap, path2), UIO_USERSPACE); 2669 } 2670 2671 /* 2672 * Delete a whiteout from the filesystem. 2673 */ 2674 /* ARGSUSED */ 2675 int 2676 sys_undelete(struct lwp *l, const struct sys_undelete_args *uap, register_t *retval) 2677 { 2678 /* { 2679 syscallarg(const char *) path; 2680 } */ 2681 int error; 2682 struct pathbuf *pb; 2683 struct nameidata nd; 2684 2685 error = pathbuf_copyin(SCARG(uap, path), &pb); 2686 if (error) { 2687 return error; 2688 } 2689 2690 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT, pb); 2691 error = namei(&nd); 2692 if (error) { 2693 pathbuf_destroy(pb); 2694 return (error); 2695 } 2696 2697 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 2698 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2699 if (nd.ni_dvp == nd.ni_vp) 2700 vrele(nd.ni_dvp); 2701 else 2702 vput(nd.ni_dvp); 2703 if (nd.ni_vp) 2704 vrele(nd.ni_vp); 2705 pathbuf_destroy(pb); 2706 return (EEXIST); 2707 } 2708 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 2709 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2710 vput(nd.ni_dvp); 2711 pathbuf_destroy(pb); 2712 return (error); 2713 } 2714 2715 /* 2716 * Delete a name from the filesystem. 2717 */ 2718 /* ARGSUSED */ 2719 int 2720 sys_unlink(struct lwp *l, const struct sys_unlink_args *uap, register_t *retval) 2721 { 2722 /* { 2723 syscallarg(const char *) path; 2724 } */ 2725 2726 return do_sys_unlinkat(l, AT_FDCWD, SCARG(uap, path), 0, UIO_USERSPACE); 2727 } 2728 2729 int 2730 sys_unlinkat(struct lwp *l, const struct sys_unlinkat_args *uap, 2731 register_t *retval) 2732 { 2733 /* { 2734 syscallarg(int) fd; 2735 syscallarg(const char *) path; 2736 syscallarg(int) flag; 2737 } */ 2738 2739 return do_sys_unlinkat(l, SCARG(uap, fd), SCARG(uap, path), 2740 SCARG(uap, flag), UIO_USERSPACE); 2741 } 2742 2743 int 2744 do_sys_unlink(const char *arg, enum uio_seg seg) 2745 { 2746 return do_sys_unlinkat(NULL, AT_FDCWD, arg, 0, seg); 2747 } 2748 2749 static int 2750 do_sys_unlinkat(struct lwp *l, int fdat, const char *arg, int flags, 2751 enum uio_seg seg) 2752 { 2753 struct vnode *vp; 2754 int error; 2755 struct pathbuf *pb; 2756 struct nameidata nd; 2757 const char *pathstring; 2758 2759 KASSERT(l != NULL || fdat == AT_FDCWD); 2760 2761 error = pathbuf_maybe_copyin(arg, seg, &pb); 2762 if (error) { 2763 return error; 2764 } 2765 pathstring = pathbuf_stringcopy_get(pb); 2766 if (pathstring == NULL) { 2767 pathbuf_destroy(pb); 2768 return ENOMEM; 2769 } 2770 2771 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, pb); 2772 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2773 goto out; 2774 vp = nd.ni_vp; 2775 2776 /* 2777 * The root of a mounted filesystem cannot be deleted. 2778 */ 2779 if ((vp->v_vflag & VV_ROOT) != 0) { 2780 error = EBUSY; 2781 goto abort; 2782 } 2783 2784 if ((vp->v_type == VDIR) && (vp->v_mountedhere != NULL)) { 2785 error = EBUSY; 2786 goto abort; 2787 } 2788 2789 /* 2790 * No rmdir "." please. 2791 */ 2792 if (nd.ni_dvp == vp) { 2793 error = EINVAL; 2794 goto abort; 2795 } 2796 2797 /* 2798 * AT_REMOVEDIR is required to remove a directory 2799 */ 2800 if (vp->v_type == VDIR) { 2801 if (!(flags & AT_REMOVEDIR)) { 2802 error = EPERM; 2803 goto abort; 2804 } else { 2805 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2806 vput(nd.ni_dvp); 2807 goto out; 2808 } 2809 } 2810 2811 /* 2812 * Starting here we only deal with non directories. 2813 */ 2814 if (flags & AT_REMOVEDIR) { 2815 error = ENOTDIR; 2816 goto abort; 2817 } 2818 2819 #if NVERIEXEC > 0 2820 /* Handle remove requests for veriexec entries. */ 2821 if ((error = veriexec_removechk(curlwp, nd.ni_vp, pathstring)) != 0) { 2822 goto abort; 2823 } 2824 #endif /* NVERIEXEC > 0 */ 2825 2826 #ifdef FILEASSOC 2827 (void)fileassoc_file_delete(vp); 2828 #endif /* FILEASSOC */ 2829 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2830 vput(nd.ni_dvp); 2831 goto out; 2832 2833 abort: 2834 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2835 if (nd.ni_dvp == vp) 2836 vrele(nd.ni_dvp); 2837 else 2838 vput(nd.ni_dvp); 2839 vput(vp); 2840 2841 out: 2842 pathbuf_stringcopy_put(pb, pathstring); 2843 pathbuf_destroy(pb); 2844 return (error); 2845 } 2846 2847 /* 2848 * Reposition read/write file offset. 2849 */ 2850 int 2851 sys_lseek(struct lwp *l, const struct sys_lseek_args *uap, register_t *retval) 2852 { 2853 /* { 2854 syscallarg(int) fd; 2855 syscallarg(int) pad; 2856 syscallarg(off_t) offset; 2857 syscallarg(int) whence; 2858 } */ 2859 kauth_cred_t cred = l->l_cred; 2860 file_t *fp; 2861 struct vnode *vp; 2862 struct vattr vattr; 2863 off_t newoff; 2864 int error, fd; 2865 2866 fd = SCARG(uap, fd); 2867 2868 if ((fp = fd_getfile(fd)) == NULL) 2869 return (EBADF); 2870 2871 vp = fp->f_vnode; 2872 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2873 error = ESPIPE; 2874 goto out; 2875 } 2876 2877 vn_lock(vp, LK_SHARED | LK_RETRY); 2878 2879 switch (SCARG(uap, whence)) { 2880 case SEEK_CUR: 2881 newoff = fp->f_offset + SCARG(uap, offset); 2882 break; 2883 case SEEK_END: 2884 error = VOP_GETATTR(vp, &vattr, cred); 2885 if (error) { 2886 VOP_UNLOCK(vp); 2887 goto out; 2888 } 2889 newoff = SCARG(uap, offset) + vattr.va_size; 2890 break; 2891 case SEEK_SET: 2892 newoff = SCARG(uap, offset); 2893 break; 2894 default: 2895 error = EINVAL; 2896 VOP_UNLOCK(vp); 2897 goto out; 2898 } 2899 VOP_UNLOCK(vp); 2900 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) == 0) { 2901 *(off_t *)retval = fp->f_offset = newoff; 2902 } 2903 out: 2904 fd_putfile(fd); 2905 return (error); 2906 } 2907 2908 /* 2909 * Positional read system call. 2910 */ 2911 int 2912 sys_pread(struct lwp *l, const struct sys_pread_args *uap, register_t *retval) 2913 { 2914 /* { 2915 syscallarg(int) fd; 2916 syscallarg(void *) buf; 2917 syscallarg(size_t) nbyte; 2918 syscallarg(off_t) offset; 2919 } */ 2920 file_t *fp; 2921 struct vnode *vp; 2922 off_t offset; 2923 int error, fd = SCARG(uap, fd); 2924 2925 if ((fp = fd_getfile(fd)) == NULL) 2926 return (EBADF); 2927 2928 if ((fp->f_flag & FREAD) == 0) { 2929 fd_putfile(fd); 2930 return (EBADF); 2931 } 2932 2933 vp = fp->f_vnode; 2934 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2935 error = ESPIPE; 2936 goto out; 2937 } 2938 2939 offset = SCARG(uap, offset); 2940 2941 /* 2942 * XXX This works because no file systems actually 2943 * XXX take any action on the seek operation. 2944 */ 2945 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2946 goto out; 2947 2948 /* dofileread() will unuse the descriptor for us */ 2949 return (dofileread(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2950 &offset, 0, retval)); 2951 2952 out: 2953 fd_putfile(fd); 2954 return (error); 2955 } 2956 2957 /* 2958 * Positional scatter read system call. 2959 */ 2960 int 2961 sys_preadv(struct lwp *l, const struct sys_preadv_args *uap, register_t *retval) 2962 { 2963 /* { 2964 syscallarg(int) fd; 2965 syscallarg(const struct iovec *) iovp; 2966 syscallarg(int) iovcnt; 2967 syscallarg(off_t) offset; 2968 } */ 2969 off_t offset = SCARG(uap, offset); 2970 2971 return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp), 2972 SCARG(uap, iovcnt), &offset, 0, retval); 2973 } 2974 2975 /* 2976 * Positional write system call. 2977 */ 2978 int 2979 sys_pwrite(struct lwp *l, const struct sys_pwrite_args *uap, register_t *retval) 2980 { 2981 /* { 2982 syscallarg(int) fd; 2983 syscallarg(const void *) buf; 2984 syscallarg(size_t) nbyte; 2985 syscallarg(off_t) offset; 2986 } */ 2987 file_t *fp; 2988 struct vnode *vp; 2989 off_t offset; 2990 int error, fd = SCARG(uap, fd); 2991 2992 if ((fp = fd_getfile(fd)) == NULL) 2993 return (EBADF); 2994 2995 if ((fp->f_flag & FWRITE) == 0) { 2996 fd_putfile(fd); 2997 return (EBADF); 2998 } 2999 3000 vp = fp->f_vnode; 3001 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 3002 error = ESPIPE; 3003 goto out; 3004 } 3005 3006 offset = SCARG(uap, offset); 3007 3008 /* 3009 * XXX This works because no file systems actually 3010 * XXX take any action on the seek operation. 3011 */ 3012 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 3013 goto out; 3014 3015 /* dofilewrite() will unuse the descriptor for us */ 3016 return (dofilewrite(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 3017 &offset, 0, retval)); 3018 3019 out: 3020 fd_putfile(fd); 3021 return (error); 3022 } 3023 3024 /* 3025 * Positional gather write system call. 3026 */ 3027 int 3028 sys_pwritev(struct lwp *l, const struct sys_pwritev_args *uap, register_t *retval) 3029 { 3030 /* { 3031 syscallarg(int) fd; 3032 syscallarg(const struct iovec *) iovp; 3033 syscallarg(int) iovcnt; 3034 syscallarg(off_t) offset; 3035 } */ 3036 off_t offset = SCARG(uap, offset); 3037 3038 return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp), 3039 SCARG(uap, iovcnt), &offset, 0, retval); 3040 } 3041 3042 /* 3043 * Check access permissions. 3044 */ 3045 int 3046 sys_access(struct lwp *l, const struct sys_access_args *uap, register_t *retval) 3047 { 3048 /* { 3049 syscallarg(const char *) path; 3050 syscallarg(int) flags; 3051 } */ 3052 3053 return do_sys_accessat(l, AT_FDCWD, SCARG(uap, path), 3054 SCARG(uap, flags), 0); 3055 } 3056 3057 int 3058 do_sys_accessat(struct lwp *l, int fdat, const char *path, 3059 int mode, int flags) 3060 { 3061 kauth_cred_t cred; 3062 struct vnode *vp; 3063 int error, nd_flag, vmode; 3064 struct pathbuf *pb; 3065 struct nameidata nd; 3066 3067 CTASSERT(F_OK == 0); 3068 if ((mode & ~(R_OK | W_OK | X_OK)) != 0) { 3069 /* nonsense mode */ 3070 return EINVAL; 3071 } 3072 3073 nd_flag = FOLLOW | LOCKLEAF | LOCKSHARED | TRYEMULROOT; 3074 if (flags & AT_SYMLINK_NOFOLLOW) 3075 nd_flag &= ~FOLLOW; 3076 3077 error = pathbuf_copyin(path, &pb); 3078 if (error) 3079 return error; 3080 3081 NDINIT(&nd, LOOKUP, nd_flag, pb); 3082 3083 /* Override default credentials */ 3084 cred = kauth_cred_dup(l->l_cred); 3085 if (!(flags & AT_EACCESS)) { 3086 kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); 3087 kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); 3088 } 3089 nd.ni_cnd.cn_cred = cred; 3090 3091 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 3092 pathbuf_destroy(pb); 3093 goto out; 3094 } 3095 vp = nd.ni_vp; 3096 pathbuf_destroy(pb); 3097 3098 /* Flags == 0 means only check for existence. */ 3099 if (mode) { 3100 vmode = 0; 3101 if (mode & R_OK) 3102 vmode |= VREAD; 3103 if (mode & W_OK) 3104 vmode |= VWRITE; 3105 if (mode & X_OK) 3106 vmode |= VEXEC; 3107 3108 error = VOP_ACCESS(vp, vmode, cred); 3109 if (!error && (vmode & VWRITE)) 3110 error = vn_writechk(vp); 3111 } 3112 vput(vp); 3113 out: 3114 kauth_cred_free(cred); 3115 return (error); 3116 } 3117 3118 int 3119 sys_faccessat(struct lwp *l, const struct sys_faccessat_args *uap, 3120 register_t *retval) 3121 { 3122 /* { 3123 syscallarg(int) fd; 3124 syscallarg(const char *) path; 3125 syscallarg(int) amode; 3126 syscallarg(int) flag; 3127 } */ 3128 3129 return do_sys_accessat(l, SCARG(uap, fd), SCARG(uap, path), 3130 SCARG(uap, amode), SCARG(uap, flag)); 3131 } 3132 3133 /* 3134 * Common code for all sys_stat functions, including compat versions. 3135 */ 3136 int 3137 do_sys_stat(const char *userpath, unsigned int nd_flag, 3138 struct stat *sb) 3139 { 3140 return do_sys_statat(NULL, AT_FDCWD, userpath, nd_flag, sb); 3141 } 3142 3143 int 3144 do_sys_statat(struct lwp *l, int fdat, const char *userpath, 3145 unsigned int nd_flag, struct stat *sb) 3146 { 3147 int error; 3148 struct pathbuf *pb; 3149 struct nameidata nd; 3150 3151 KASSERT(l != NULL || fdat == AT_FDCWD); 3152 3153 error = pathbuf_copyin(userpath, &pb); 3154 if (error) { 3155 return error; 3156 } 3157 3158 NDINIT(&nd, LOOKUP, nd_flag | LOCKLEAF | TRYEMULROOT, pb); 3159 3160 error = fd_nameiat(l, fdat, &nd); 3161 if (error != 0) { 3162 pathbuf_destroy(pb); 3163 return error; 3164 } 3165 error = vn_stat(nd.ni_vp, sb); 3166 vput(nd.ni_vp); 3167 pathbuf_destroy(pb); 3168 return error; 3169 } 3170 3171 /* 3172 * Get file status; this version follows links. 3173 */ 3174 /* ARGSUSED */ 3175 int 3176 sys___stat50(struct lwp *l, const struct sys___stat50_args *uap, register_t *retval) 3177 { 3178 /* { 3179 syscallarg(const char *) path; 3180 syscallarg(struct stat *) ub; 3181 } */ 3182 struct stat sb; 3183 int error; 3184 3185 error = do_sys_statat(l, AT_FDCWD, SCARG(uap, path), FOLLOW, &sb); 3186 if (error) 3187 return error; 3188 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 3189 } 3190 3191 /* 3192 * Get file status; this version does not follow links. 3193 */ 3194 /* ARGSUSED */ 3195 int 3196 sys___lstat50(struct lwp *l, const struct sys___lstat50_args *uap, register_t *retval) 3197 { 3198 /* { 3199 syscallarg(const char *) path; 3200 syscallarg(struct stat *) ub; 3201 } */ 3202 struct stat sb; 3203 int error; 3204 3205 error = do_sys_statat(l, AT_FDCWD, SCARG(uap, path), NOFOLLOW, &sb); 3206 if (error) 3207 return error; 3208 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 3209 } 3210 3211 int 3212 sys_fstatat(struct lwp *l, const struct sys_fstatat_args *uap, 3213 register_t *retval) 3214 { 3215 /* { 3216 syscallarg(int) fd; 3217 syscallarg(const char *) path; 3218 syscallarg(struct stat *) buf; 3219 syscallarg(int) flag; 3220 } */ 3221 unsigned int nd_flag; 3222 struct stat sb; 3223 int error; 3224 3225 if (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) 3226 nd_flag = NOFOLLOW; 3227 else 3228 nd_flag = FOLLOW; 3229 3230 error = do_sys_statat(l, SCARG(uap, fd), SCARG(uap, path), nd_flag, 3231 &sb); 3232 if (error) 3233 return error; 3234 return copyout(&sb, SCARG(uap, buf), sizeof(sb)); 3235 } 3236 3237 static int 3238 kern_pathconf(register_t *retval, const char *path, int name, int flag) 3239 { 3240 int error; 3241 struct pathbuf *pb; 3242 struct nameidata nd; 3243 3244 error = pathbuf_copyin(path, &pb); 3245 if (error) { 3246 return error; 3247 } 3248 NDINIT(&nd, LOOKUP, flag | LOCKLEAF | TRYEMULROOT, pb); 3249 if ((error = namei(&nd)) != 0) { 3250 pathbuf_destroy(pb); 3251 return error; 3252 } 3253 error = VOP_PATHCONF(nd.ni_vp, name, retval); 3254 vput(nd.ni_vp); 3255 pathbuf_destroy(pb); 3256 return error; 3257 } 3258 3259 /* 3260 * Get configurable pathname variables. 3261 */ 3262 /* ARGSUSED */ 3263 int 3264 sys_pathconf(struct lwp *l, const struct sys_pathconf_args *uap, 3265 register_t *retval) 3266 { 3267 /* { 3268 syscallarg(const char *) path; 3269 syscallarg(int) name; 3270 } */ 3271 return kern_pathconf(retval, SCARG(uap, path), SCARG(uap, name), 3272 FOLLOW); 3273 } 3274 3275 /* ARGSUSED */ 3276 int 3277 sys_lpathconf(struct lwp *l, const struct sys_lpathconf_args *uap, 3278 register_t *retval) 3279 { 3280 /* { 3281 syscallarg(const char *) path; 3282 syscallarg(int) name; 3283 } */ 3284 return kern_pathconf(retval, SCARG(uap, path), SCARG(uap, name), 3285 NOFOLLOW); 3286 } 3287 3288 /* 3289 * Return target name of a symbolic link. 3290 */ 3291 /* ARGSUSED */ 3292 int 3293 sys_readlink(struct lwp *l, const struct sys_readlink_args *uap, 3294 register_t *retval) 3295 { 3296 /* { 3297 syscallarg(const char *) path; 3298 syscallarg(char *) buf; 3299 syscallarg(size_t) count; 3300 } */ 3301 return do_sys_readlinkat(l, AT_FDCWD, SCARG(uap, path), 3302 SCARG(uap, buf), SCARG(uap, count), retval); 3303 } 3304 3305 static int 3306 do_sys_readlinkat(struct lwp *l, int fdat, const char *path, char *buf, 3307 size_t count, register_t *retval) 3308 { 3309 struct vnode *vp; 3310 struct iovec aiov; 3311 struct uio auio; 3312 int error; 3313 struct pathbuf *pb; 3314 struct nameidata nd; 3315 3316 error = pathbuf_copyin(path, &pb); 3317 if (error) { 3318 return error; 3319 } 3320 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKSHARED | TRYEMULROOT, pb); 3321 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 3322 pathbuf_destroy(pb); 3323 return error; 3324 } 3325 vp = nd.ni_vp; 3326 pathbuf_destroy(pb); 3327 if (vp->v_type != VLNK) 3328 error = EINVAL; 3329 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 3330 (error = VOP_ACCESS(vp, VREAD, l->l_cred)) == 0) { 3331 aiov.iov_base = buf; 3332 aiov.iov_len = count; 3333 auio.uio_iov = &aiov; 3334 auio.uio_iovcnt = 1; 3335 auio.uio_offset = 0; 3336 auio.uio_rw = UIO_READ; 3337 KASSERT(l == curlwp); 3338 auio.uio_vmspace = l->l_proc->p_vmspace; 3339 auio.uio_resid = count; 3340 if ((error = VOP_READLINK(vp, &auio, l->l_cred)) == 0) 3341 *retval = count - auio.uio_resid; 3342 } 3343 vput(vp); 3344 return (error); 3345 } 3346 3347 int 3348 sys_readlinkat(struct lwp *l, const struct sys_readlinkat_args *uap, 3349 register_t *retval) 3350 { 3351 /* { 3352 syscallarg(int) fd; 3353 syscallarg(const char *) path; 3354 syscallarg(char *) buf; 3355 syscallarg(size_t) bufsize; 3356 } */ 3357 3358 return do_sys_readlinkat(l, SCARG(uap, fd), SCARG(uap, path), 3359 SCARG(uap, buf), SCARG(uap, bufsize), retval); 3360 } 3361 3362 /* 3363 * Change flags of a file given a path name. 3364 */ 3365 /* ARGSUSED */ 3366 int 3367 sys_chflags(struct lwp *l, const struct sys_chflags_args *uap, register_t *retval) 3368 { 3369 /* { 3370 syscallarg(const char *) path; 3371 syscallarg(u_long) flags; 3372 } */ 3373 struct vnode *vp; 3374 int error; 3375 3376 error = namei_simple_user(SCARG(uap, path), 3377 NSM_FOLLOW_TRYEMULROOT, &vp); 3378 if (error != 0) 3379 return (error); 3380 error = change_flags(vp, SCARG(uap, flags), l); 3381 vput(vp); 3382 return (error); 3383 } 3384 3385 /* 3386 * Change flags of a file given a file descriptor. 3387 */ 3388 /* ARGSUSED */ 3389 int 3390 sys_fchflags(struct lwp *l, const struct sys_fchflags_args *uap, register_t *retval) 3391 { 3392 /* { 3393 syscallarg(int) fd; 3394 syscallarg(u_long) flags; 3395 } */ 3396 struct vnode *vp; 3397 file_t *fp; 3398 int error; 3399 3400 /* fd_getvnode() will use the descriptor for us */ 3401 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3402 return (error); 3403 vp = fp->f_vnode; 3404 error = change_flags(vp, SCARG(uap, flags), l); 3405 VOP_UNLOCK(vp); 3406 fd_putfile(SCARG(uap, fd)); 3407 return (error); 3408 } 3409 3410 /* 3411 * Change flags of a file given a path name; this version does 3412 * not follow links. 3413 */ 3414 int 3415 sys_lchflags(struct lwp *l, const struct sys_lchflags_args *uap, register_t *retval) 3416 { 3417 /* { 3418 syscallarg(const char *) path; 3419 syscallarg(u_long) flags; 3420 } */ 3421 struct vnode *vp; 3422 int error; 3423 3424 error = namei_simple_user(SCARG(uap, path), 3425 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3426 if (error != 0) 3427 return (error); 3428 error = change_flags(vp, SCARG(uap, flags), l); 3429 vput(vp); 3430 return (error); 3431 } 3432 3433 /* 3434 * Common routine to change flags of a file. 3435 */ 3436 int 3437 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 3438 { 3439 struct vattr vattr; 3440 int error; 3441 3442 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3443 3444 vattr_null(&vattr); 3445 vattr.va_flags = flags; 3446 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3447 3448 return (error); 3449 } 3450 3451 /* 3452 * Change mode of a file given path name; this version follows links. 3453 */ 3454 /* ARGSUSED */ 3455 int 3456 sys_chmod(struct lwp *l, const struct sys_chmod_args *uap, register_t *retval) 3457 { 3458 /* { 3459 syscallarg(const char *) path; 3460 syscallarg(int) mode; 3461 } */ 3462 return do_sys_chmodat(l, AT_FDCWD, SCARG(uap, path), 3463 SCARG(uap, mode), 0); 3464 } 3465 3466 int 3467 do_sys_chmodat(struct lwp *l, int fdat, const char *path, int mode, int flags) 3468 { 3469 int error; 3470 struct vnode *vp; 3471 namei_simple_flags_t ns_flag; 3472 3473 if (flags & AT_SYMLINK_NOFOLLOW) 3474 ns_flag = NSM_NOFOLLOW_TRYEMULROOT; 3475 else 3476 ns_flag = NSM_FOLLOW_TRYEMULROOT; 3477 3478 error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp); 3479 if (error != 0) 3480 return error; 3481 3482 error = change_mode(vp, mode, l); 3483 3484 vrele(vp); 3485 3486 return (error); 3487 } 3488 3489 /* 3490 * Change mode of a file given a file descriptor. 3491 */ 3492 /* ARGSUSED */ 3493 int 3494 sys_fchmod(struct lwp *l, const struct sys_fchmod_args *uap, register_t *retval) 3495 { 3496 /* { 3497 syscallarg(int) fd; 3498 syscallarg(int) mode; 3499 } */ 3500 file_t *fp; 3501 int error; 3502 3503 /* fd_getvnode() will use the descriptor for us */ 3504 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3505 return (error); 3506 error = change_mode(fp->f_vnode, SCARG(uap, mode), l); 3507 fd_putfile(SCARG(uap, fd)); 3508 return (error); 3509 } 3510 3511 int 3512 sys_fchmodat(struct lwp *l, const struct sys_fchmodat_args *uap, 3513 register_t *retval) 3514 { 3515 /* { 3516 syscallarg(int) fd; 3517 syscallarg(const char *) path; 3518 syscallarg(int) mode; 3519 syscallarg(int) flag; 3520 } */ 3521 3522 return do_sys_chmodat(l, SCARG(uap, fd), SCARG(uap, path), 3523 SCARG(uap, mode), SCARG(uap, flag)); 3524 } 3525 3526 /* 3527 * Change mode of a file given path name; this version does not follow links. 3528 */ 3529 /* ARGSUSED */ 3530 int 3531 sys_lchmod(struct lwp *l, const struct sys_lchmod_args *uap, register_t *retval) 3532 { 3533 /* { 3534 syscallarg(const char *) path; 3535 syscallarg(int) mode; 3536 } */ 3537 int error; 3538 struct vnode *vp; 3539 3540 error = namei_simple_user(SCARG(uap, path), 3541 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3542 if (error != 0) 3543 return (error); 3544 3545 error = change_mode(vp, SCARG(uap, mode), l); 3546 3547 vrele(vp); 3548 return (error); 3549 } 3550 3551 /* 3552 * Common routine to set mode given a vnode. 3553 */ 3554 static int 3555 change_mode(struct vnode *vp, int mode, struct lwp *l) 3556 { 3557 struct vattr vattr; 3558 int error; 3559 3560 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3561 vattr_null(&vattr); 3562 vattr.va_mode = mode & ALLPERMS; 3563 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3564 VOP_UNLOCK(vp); 3565 return (error); 3566 } 3567 3568 /* 3569 * Set ownership given a path name; this version follows links. 3570 */ 3571 /* ARGSUSED */ 3572 int 3573 sys_chown(struct lwp *l, const struct sys_chown_args *uap, register_t *retval) 3574 { 3575 /* { 3576 syscallarg(const char *) path; 3577 syscallarg(uid_t) uid; 3578 syscallarg(gid_t) gid; 3579 } */ 3580 return do_sys_chownat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap,uid), 3581 SCARG(uap, gid), 0); 3582 } 3583 3584 int 3585 do_sys_chownat(struct lwp *l, int fdat, const char *path, uid_t uid, 3586 gid_t gid, int flags) 3587 { 3588 int error; 3589 struct vnode *vp; 3590 namei_simple_flags_t ns_flag; 3591 3592 if (flags & AT_SYMLINK_NOFOLLOW) 3593 ns_flag = NSM_NOFOLLOW_TRYEMULROOT; 3594 else 3595 ns_flag = NSM_FOLLOW_TRYEMULROOT; 3596 3597 error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp); 3598 if (error != 0) 3599 return error; 3600 3601 error = change_owner(vp, uid, gid, l, 0); 3602 3603 vrele(vp); 3604 3605 return (error); 3606 } 3607 3608 /* 3609 * Set ownership given a path name; this version follows links. 3610 * Provides POSIX semantics. 3611 */ 3612 /* ARGSUSED */ 3613 int 3614 sys___posix_chown(struct lwp *l, const struct sys___posix_chown_args *uap, register_t *retval) 3615 { 3616 /* { 3617 syscallarg(const char *) path; 3618 syscallarg(uid_t) uid; 3619 syscallarg(gid_t) gid; 3620 } */ 3621 int error; 3622 struct vnode *vp; 3623 3624 error = namei_simple_user(SCARG(uap, path), 3625 NSM_FOLLOW_TRYEMULROOT, &vp); 3626 if (error != 0) 3627 return (error); 3628 3629 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3630 3631 vrele(vp); 3632 return (error); 3633 } 3634 3635 /* 3636 * Set ownership given a file descriptor. 3637 */ 3638 /* ARGSUSED */ 3639 int 3640 sys_fchown(struct lwp *l, const struct sys_fchown_args *uap, register_t *retval) 3641 { 3642 /* { 3643 syscallarg(int) fd; 3644 syscallarg(uid_t) uid; 3645 syscallarg(gid_t) gid; 3646 } */ 3647 int error; 3648 file_t *fp; 3649 3650 /* fd_getvnode() will use the descriptor for us */ 3651 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3652 return (error); 3653 error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid), 3654 l, 0); 3655 fd_putfile(SCARG(uap, fd)); 3656 return (error); 3657 } 3658 3659 int 3660 sys_fchownat(struct lwp *l, const struct sys_fchownat_args *uap, 3661 register_t *retval) 3662 { 3663 /* { 3664 syscallarg(int) fd; 3665 syscallarg(const char *) path; 3666 syscallarg(uid_t) owner; 3667 syscallarg(gid_t) group; 3668 syscallarg(int) flag; 3669 } */ 3670 3671 return do_sys_chownat(l, SCARG(uap, fd), SCARG(uap, path), 3672 SCARG(uap, owner), SCARG(uap, group), 3673 SCARG(uap, flag)); 3674 } 3675 3676 /* 3677 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 3678 */ 3679 /* ARGSUSED */ 3680 int 3681 sys___posix_fchown(struct lwp *l, const struct sys___posix_fchown_args *uap, register_t *retval) 3682 { 3683 /* { 3684 syscallarg(int) fd; 3685 syscallarg(uid_t) uid; 3686 syscallarg(gid_t) gid; 3687 } */ 3688 int error; 3689 file_t *fp; 3690 3691 /* fd_getvnode() will use the descriptor for us */ 3692 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3693 return (error); 3694 error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid), 3695 l, 1); 3696 fd_putfile(SCARG(uap, fd)); 3697 return (error); 3698 } 3699 3700 /* 3701 * Set ownership given a path name; this version does not follow links. 3702 */ 3703 /* ARGSUSED */ 3704 int 3705 sys_lchown(struct lwp *l, const struct sys_lchown_args *uap, register_t *retval) 3706 { 3707 /* { 3708 syscallarg(const char *) path; 3709 syscallarg(uid_t) uid; 3710 syscallarg(gid_t) gid; 3711 } */ 3712 int error; 3713 struct vnode *vp; 3714 3715 error = namei_simple_user(SCARG(uap, path), 3716 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3717 if (error != 0) 3718 return (error); 3719 3720 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 3721 3722 vrele(vp); 3723 return (error); 3724 } 3725 3726 /* 3727 * Set ownership given a path name; this version does not follow links. 3728 * Provides POSIX/XPG semantics. 3729 */ 3730 /* ARGSUSED */ 3731 int 3732 sys___posix_lchown(struct lwp *l, const struct sys___posix_lchown_args *uap, register_t *retval) 3733 { 3734 /* { 3735 syscallarg(const char *) path; 3736 syscallarg(uid_t) uid; 3737 syscallarg(gid_t) gid; 3738 } */ 3739 int error; 3740 struct vnode *vp; 3741 3742 error = namei_simple_user(SCARG(uap, path), 3743 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3744 if (error != 0) 3745 return (error); 3746 3747 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3748 3749 vrele(vp); 3750 return (error); 3751 } 3752 3753 /* 3754 * Common routine to set ownership given a vnode. 3755 */ 3756 static int 3757 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 3758 int posix_semantics) 3759 { 3760 struct vattr vattr; 3761 mode_t newmode; 3762 int error; 3763 3764 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3765 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) 3766 goto out; 3767 3768 #define CHANGED(x) ((int)(x) != -1) 3769 newmode = vattr.va_mode; 3770 if (posix_semantics) { 3771 /* 3772 * POSIX/XPG semantics: if the caller is not the super-user, 3773 * clear set-user-id and set-group-id bits. Both POSIX and 3774 * the XPG consider the behaviour for calls by the super-user 3775 * implementation-defined; we leave the set-user-id and set- 3776 * group-id settings intact in that case. 3777 */ 3778 if (vattr.va_mode & S_ISUID) { 3779 if (kauth_authorize_vnode(l->l_cred, 3780 KAUTH_VNODE_RETAIN_SUID, vp, NULL, EPERM) != 0) 3781 newmode &= ~S_ISUID; 3782 } 3783 if (vattr.va_mode & S_ISGID) { 3784 if (kauth_authorize_vnode(l->l_cred, 3785 KAUTH_VNODE_RETAIN_SGID, vp, NULL, EPERM) != 0) 3786 newmode &= ~S_ISGID; 3787 } 3788 } else { 3789 /* 3790 * NetBSD semantics: when changing owner and/or group, 3791 * clear the respective bit(s). 3792 */ 3793 if (CHANGED(uid)) 3794 newmode &= ~S_ISUID; 3795 if (CHANGED(gid)) 3796 newmode &= ~S_ISGID; 3797 } 3798 /* Update va_mode iff altered. */ 3799 if (vattr.va_mode == newmode) 3800 newmode = VNOVAL; 3801 3802 vattr_null(&vattr); 3803 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 3804 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 3805 vattr.va_mode = newmode; 3806 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3807 #undef CHANGED 3808 3809 out: 3810 VOP_UNLOCK(vp); 3811 return (error); 3812 } 3813 3814 /* 3815 * Set the access and modification times given a path name; this 3816 * version follows links. 3817 */ 3818 /* ARGSUSED */ 3819 int 3820 sys___utimes50(struct lwp *l, const struct sys___utimes50_args *uap, 3821 register_t *retval) 3822 { 3823 /* { 3824 syscallarg(const char *) path; 3825 syscallarg(const struct timeval *) tptr; 3826 } */ 3827 3828 return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, 3829 SCARG(uap, tptr), UIO_USERSPACE); 3830 } 3831 3832 /* 3833 * Set the access and modification times given a file descriptor. 3834 */ 3835 /* ARGSUSED */ 3836 int 3837 sys___futimes50(struct lwp *l, const struct sys___futimes50_args *uap, 3838 register_t *retval) 3839 { 3840 /* { 3841 syscallarg(int) fd; 3842 syscallarg(const struct timeval *) tptr; 3843 } */ 3844 int error; 3845 file_t *fp; 3846 3847 /* fd_getvnode() will use the descriptor for us */ 3848 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3849 return (error); 3850 error = do_sys_utimes(l, fp->f_vnode, NULL, 0, SCARG(uap, tptr), 3851 UIO_USERSPACE); 3852 fd_putfile(SCARG(uap, fd)); 3853 return (error); 3854 } 3855 3856 int 3857 sys_futimens(struct lwp *l, const struct sys_futimens_args *uap, 3858 register_t *retval) 3859 { 3860 /* { 3861 syscallarg(int) fd; 3862 syscallarg(const struct timespec *) tptr; 3863 } */ 3864 int error; 3865 file_t *fp; 3866 3867 /* fd_getvnode() will use the descriptor for us */ 3868 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3869 return (error); 3870 error = do_sys_utimensat(l, AT_FDCWD, fp->f_vnode, NULL, 0, 3871 SCARG(uap, tptr), UIO_USERSPACE); 3872 fd_putfile(SCARG(uap, fd)); 3873 return (error); 3874 } 3875 3876 /* 3877 * Set the access and modification times given a path name; this 3878 * version does not follow links. 3879 */ 3880 int 3881 sys___lutimes50(struct lwp *l, const struct sys___lutimes50_args *uap, 3882 register_t *retval) 3883 { 3884 /* { 3885 syscallarg(const char *) path; 3886 syscallarg(const struct timeval *) tptr; 3887 } */ 3888 3889 return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW, 3890 SCARG(uap, tptr), UIO_USERSPACE); 3891 } 3892 3893 int 3894 sys_utimensat(struct lwp *l, const struct sys_utimensat_args *uap, 3895 register_t *retval) 3896 { 3897 /* { 3898 syscallarg(int) fd; 3899 syscallarg(const char *) path; 3900 syscallarg(const struct timespec *) tptr; 3901 syscallarg(int) flag; 3902 } */ 3903 int follow; 3904 const struct timespec *tptr; 3905 int error; 3906 3907 tptr = SCARG(uap, tptr); 3908 follow = (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 3909 3910 error = do_sys_utimensat(l, SCARG(uap, fd), NULL, 3911 SCARG(uap, path), follow, tptr, UIO_USERSPACE); 3912 3913 return error; 3914 } 3915 3916 /* 3917 * Common routine to set access and modification times given a vnode. 3918 */ 3919 int 3920 do_sys_utimens(struct lwp *l, struct vnode *vp, const char *path, int flag, 3921 const struct timespec *tptr, enum uio_seg seg) 3922 { 3923 return do_sys_utimensat(l, AT_FDCWD, vp, path, flag, tptr, seg); 3924 } 3925 3926 int 3927 do_sys_utimensat(struct lwp *l, int fdat, struct vnode *vp, 3928 const char *path, int flag, const struct timespec *tptr, enum uio_seg seg) 3929 { 3930 struct vattr vattr; 3931 int error, dorele = 0; 3932 namei_simple_flags_t sflags; 3933 bool vanull, setbirthtime; 3934 struct timespec ts[2]; 3935 3936 KASSERT(l != NULL || fdat == AT_FDCWD); 3937 3938 /* 3939 * I have checked all callers and they pass either FOLLOW, 3940 * NOFOLLOW, or 0 (when they don't pass a path), and NOFOLLOW 3941 * is 0. More to the point, they don't pass anything else. 3942 * Let's keep it that way at least until the namei interfaces 3943 * are fully sanitized. 3944 */ 3945 KASSERT(flag == NOFOLLOW || flag == FOLLOW); 3946 sflags = (flag == FOLLOW) ? 3947 NSM_FOLLOW_TRYEMULROOT : NSM_NOFOLLOW_TRYEMULROOT; 3948 3949 if (tptr == NULL) { 3950 vanull = true; 3951 nanotime(&ts[0]); 3952 ts[1] = ts[0]; 3953 } else { 3954 vanull = false; 3955 if (seg != UIO_SYSSPACE) { 3956 error = copyin(tptr, ts, sizeof (ts)); 3957 if (error != 0) 3958 return error; 3959 } else { 3960 ts[0] = tptr[0]; 3961 ts[1] = tptr[1]; 3962 } 3963 } 3964 3965 if (ts[0].tv_nsec == UTIME_NOW) { 3966 nanotime(&ts[0]); 3967 if (ts[1].tv_nsec == UTIME_NOW) { 3968 vanull = true; 3969 ts[1] = ts[0]; 3970 } 3971 } else if (ts[1].tv_nsec == UTIME_NOW) 3972 nanotime(&ts[1]); 3973 3974 if (vp == NULL) { 3975 /* note: SEG describes TPTR, not PATH; PATH is always user */ 3976 error = fd_nameiat_simple_user(l, fdat, path, sflags, &vp); 3977 if (error != 0) 3978 return error; 3979 dorele = 1; 3980 } 3981 3982 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3983 setbirthtime = (VOP_GETATTR(vp, &vattr, l->l_cred) == 0 && 3984 timespeccmp(&ts[1], &vattr.va_birthtime, <)); 3985 vattr_null(&vattr); 3986 3987 if (ts[0].tv_nsec != UTIME_OMIT) 3988 vattr.va_atime = ts[0]; 3989 3990 if (ts[1].tv_nsec != UTIME_OMIT) { 3991 vattr.va_mtime = ts[1]; 3992 if (setbirthtime) 3993 vattr.va_birthtime = ts[1]; 3994 } 3995 3996 if (vanull) 3997 vattr.va_vaflags |= VA_UTIMES_NULL; 3998 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3999 VOP_UNLOCK(vp); 4000 4001 if (dorele != 0) 4002 vrele(vp); 4003 4004 return error; 4005 } 4006 4007 int 4008 do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag, 4009 const struct timeval *tptr, enum uio_seg seg) 4010 { 4011 struct timespec ts[2]; 4012 struct timespec *tsptr = NULL; 4013 int error; 4014 4015 if (tptr != NULL) { 4016 struct timeval tv[2]; 4017 4018 if (seg != UIO_SYSSPACE) { 4019 error = copyin(tptr, tv, sizeof(tv)); 4020 if (error != 0) 4021 return error; 4022 tptr = tv; 4023 } 4024 4025 if ((tptr[0].tv_usec == UTIME_NOW) || 4026 (tptr[0].tv_usec == UTIME_OMIT)) 4027 ts[0].tv_nsec = tptr[0].tv_usec; 4028 else { 4029 if (tptr[0].tv_usec < 0 || tptr[0].tv_usec >= 1000000) 4030 return EINVAL; 4031 4032 TIMEVAL_TO_TIMESPEC(&tptr[0], &ts[0]); 4033 } 4034 4035 if ((tptr[1].tv_usec == UTIME_NOW) || 4036 (tptr[1].tv_usec == UTIME_OMIT)) 4037 ts[1].tv_nsec = tptr[1].tv_usec; 4038 else { 4039 if (tptr[1].tv_usec < 0 || tptr[1].tv_usec >= 1000000) 4040 return EINVAL; 4041 4042 TIMEVAL_TO_TIMESPEC(&tptr[1], &ts[1]); 4043 } 4044 4045 tsptr = &ts[0]; 4046 } 4047 4048 return do_sys_utimens(l, vp, path, flag, tsptr, UIO_SYSSPACE); 4049 } 4050 4051 /* 4052 * Truncate a file given its path name. 4053 */ 4054 /* ARGSUSED */ 4055 int 4056 sys_truncate(struct lwp *l, const struct sys_truncate_args *uap, register_t *retval) 4057 { 4058 /* { 4059 syscallarg(const char *) path; 4060 syscallarg(int) pad; 4061 syscallarg(off_t) length; 4062 } */ 4063 struct vnode *vp; 4064 struct vattr vattr; 4065 int error; 4066 4067 if (SCARG(uap, length) < 0) 4068 return EINVAL; 4069 4070 error = namei_simple_user(SCARG(uap, path), 4071 NSM_FOLLOW_TRYEMULROOT, &vp); 4072 if (error != 0) 4073 return (error); 4074 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4075 if (vp->v_type == VDIR) 4076 error = EISDIR; 4077 else if ((error = vn_writechk(vp)) == 0 && 4078 (error = VOP_ACCESS(vp, VWRITE, l->l_cred)) == 0) { 4079 vattr_null(&vattr); 4080 vattr.va_size = SCARG(uap, length); 4081 error = VOP_SETATTR(vp, &vattr, l->l_cred); 4082 } 4083 vput(vp); 4084 return (error); 4085 } 4086 4087 /* 4088 * Truncate a file given a file descriptor. 4089 */ 4090 /* ARGSUSED */ 4091 int 4092 sys_ftruncate(struct lwp *l, const struct sys_ftruncate_args *uap, register_t *retval) 4093 { 4094 /* { 4095 syscallarg(int) fd; 4096 syscallarg(int) pad; 4097 syscallarg(off_t) length; 4098 } */ 4099 struct vattr vattr; 4100 struct vnode *vp; 4101 file_t *fp; 4102 int error; 4103 4104 if (SCARG(uap, length) < 0) 4105 return EINVAL; 4106 4107 /* fd_getvnode() will use the descriptor for us */ 4108 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4109 return (error); 4110 if ((fp->f_flag & FWRITE) == 0) { 4111 error = EINVAL; 4112 goto out; 4113 } 4114 vp = fp->f_vnode; 4115 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4116 if (vp->v_type == VDIR) 4117 error = EISDIR; 4118 else if ((error = vn_writechk(vp)) == 0) { 4119 vattr_null(&vattr); 4120 vattr.va_size = SCARG(uap, length); 4121 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 4122 } 4123 VOP_UNLOCK(vp); 4124 out: 4125 fd_putfile(SCARG(uap, fd)); 4126 return (error); 4127 } 4128 4129 /* 4130 * Sync an open file. 4131 */ 4132 /* ARGSUSED */ 4133 int 4134 sys_fsync(struct lwp *l, const struct sys_fsync_args *uap, register_t *retval) 4135 { 4136 /* { 4137 syscallarg(int) fd; 4138 } */ 4139 struct vnode *vp; 4140 file_t *fp; 4141 int error; 4142 4143 /* fd_getvnode() will use the descriptor for us */ 4144 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4145 return (error); 4146 vp = fp->f_vnode; 4147 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4148 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0); 4149 VOP_UNLOCK(vp); 4150 fd_putfile(SCARG(uap, fd)); 4151 return (error); 4152 } 4153 4154 /* 4155 * Sync a range of file data. API modeled after that found in AIX. 4156 * 4157 * FDATASYNC indicates that we need only save enough metadata to be able 4158 * to re-read the written data. 4159 */ 4160 /* ARGSUSED */ 4161 int 4162 sys_fsync_range(struct lwp *l, const struct sys_fsync_range_args *uap, register_t *retval) 4163 { 4164 /* { 4165 syscallarg(int) fd; 4166 syscallarg(int) flags; 4167 syscallarg(off_t) start; 4168 syscallarg(off_t) length; 4169 } */ 4170 struct vnode *vp; 4171 file_t *fp; 4172 int flags, nflags; 4173 off_t s, e, len; 4174 int error; 4175 4176 /* fd_getvnode() will use the descriptor for us */ 4177 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4178 return (error); 4179 4180 if ((fp->f_flag & FWRITE) == 0) { 4181 error = EBADF; 4182 goto out; 4183 } 4184 4185 flags = SCARG(uap, flags); 4186 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 4187 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 4188 error = EINVAL; 4189 goto out; 4190 } 4191 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 4192 if (flags & FDATASYNC) 4193 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 4194 else 4195 nflags = FSYNC_WAIT; 4196 if (flags & FDISKSYNC) 4197 nflags |= FSYNC_CACHE; 4198 4199 len = SCARG(uap, length); 4200 /* If length == 0, we do the whole file, and s = e = 0 will do that */ 4201 if (len) { 4202 s = SCARG(uap, start); 4203 if (s < 0 || len < 0 || len > OFF_T_MAX - s) { 4204 error = EINVAL; 4205 goto out; 4206 } 4207 e = s + len; 4208 KASSERT(s <= e); 4209 } else { 4210 e = 0; 4211 s = 0; 4212 } 4213 4214 vp = fp->f_vnode; 4215 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4216 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e); 4217 VOP_UNLOCK(vp); 4218 out: 4219 fd_putfile(SCARG(uap, fd)); 4220 return (error); 4221 } 4222 4223 /* 4224 * Sync the data of an open file. 4225 */ 4226 /* ARGSUSED */ 4227 int 4228 sys_fdatasync(struct lwp *l, const struct sys_fdatasync_args *uap, register_t *retval) 4229 { 4230 /* { 4231 syscallarg(int) fd; 4232 } */ 4233 struct vnode *vp; 4234 file_t *fp; 4235 int error; 4236 4237 /* fd_getvnode() will use the descriptor for us */ 4238 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4239 return (error); 4240 vp = fp->f_vnode; 4241 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4242 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0); 4243 VOP_UNLOCK(vp); 4244 fd_putfile(SCARG(uap, fd)); 4245 return (error); 4246 } 4247 4248 /* 4249 * Rename files, (standard) BSD semantics frontend. 4250 */ 4251 /* ARGSUSED */ 4252 int 4253 sys_rename(struct lwp *l, const struct sys_rename_args *uap, register_t *retval) 4254 { 4255 /* { 4256 syscallarg(const char *) from; 4257 syscallarg(const char *) to; 4258 } */ 4259 4260 return (do_sys_renameat(l, AT_FDCWD, SCARG(uap, from), AT_FDCWD, 4261 SCARG(uap, to), UIO_USERSPACE, 0)); 4262 } 4263 4264 int 4265 sys_renameat(struct lwp *l, const struct sys_renameat_args *uap, 4266 register_t *retval) 4267 { 4268 /* { 4269 syscallarg(int) fromfd; 4270 syscallarg(const char *) from; 4271 syscallarg(int) tofd; 4272 syscallarg(const char *) to; 4273 } */ 4274 4275 return (do_sys_renameat(l, SCARG(uap, fromfd), SCARG(uap, from), 4276 SCARG(uap, tofd), SCARG(uap, to), UIO_USERSPACE, 0)); 4277 } 4278 4279 /* 4280 * Rename files, POSIX semantics frontend. 4281 */ 4282 /* ARGSUSED */ 4283 int 4284 sys___posix_rename(struct lwp *l, const struct sys___posix_rename_args *uap, register_t *retval) 4285 { 4286 /* { 4287 syscallarg(const char *) from; 4288 syscallarg(const char *) to; 4289 } */ 4290 4291 return (do_sys_renameat(l, AT_FDCWD, SCARG(uap, from), AT_FDCWD, 4292 SCARG(uap, to), UIO_USERSPACE, 1)); 4293 } 4294 4295 /* 4296 * Rename files. Source and destination must either both be directories, 4297 * or both not be directories. If target is a directory, it must be empty. 4298 * If `from' and `to' refer to the same object, the value of the `retain' 4299 * argument is used to determine whether `from' will be 4300 * 4301 * (retain == 0) deleted unless `from' and `to' refer to the same 4302 * object in the file system's name space (BSD). 4303 * (retain == 1) always retained (POSIX). 4304 * 4305 * XXX Synchronize with nfsrv_rename in nfs_serv.c. 4306 */ 4307 int 4308 do_sys_rename(const char *from, const char *to, enum uio_seg seg, int retain) 4309 { 4310 return do_sys_renameat(NULL, AT_FDCWD, from, AT_FDCWD, to, seg, retain); 4311 } 4312 4313 static int 4314 do_sys_renameat(struct lwp *l, int fromfd, const char *from, int tofd, 4315 const char *to, enum uio_seg seg, int retain) 4316 { 4317 struct pathbuf *fpb, *tpb; 4318 struct nameidata fnd, tnd; 4319 struct vnode *fdvp, *fvp; 4320 struct vnode *tdvp, *tvp; 4321 struct mount *mp, *tmp; 4322 int error; 4323 4324 KASSERT(l != NULL || (fromfd == AT_FDCWD && tofd == AT_FDCWD)); 4325 4326 error = pathbuf_maybe_copyin(from, seg, &fpb); 4327 if (error) 4328 goto out0; 4329 KASSERT(fpb != NULL); 4330 4331 error = pathbuf_maybe_copyin(to, seg, &tpb); 4332 if (error) 4333 goto out1; 4334 KASSERT(tpb != NULL); 4335 4336 /* 4337 * Lookup from. 4338 * 4339 * XXX LOCKPARENT is wrong because we don't actually want it 4340 * locked yet, but (a) namei is insane, and (b) VOP_RENAME is 4341 * insane, so for the time being we need to leave it like this. 4342 */ 4343 NDINIT(&fnd, DELETE, (LOCKPARENT | TRYEMULROOT), fpb); 4344 if ((error = fd_nameiat(l, fromfd, &fnd)) != 0) 4345 goto out2; 4346 4347 /* 4348 * Pull out the important results of the lookup, fdvp and fvp. 4349 * Of course, fvp is bogus because we're about to unlock fdvp. 4350 */ 4351 fdvp = fnd.ni_dvp; 4352 fvp = fnd.ni_vp; 4353 mp = fdvp->v_mount; 4354 KASSERT(fdvp != NULL); 4355 KASSERT(fvp != NULL); 4356 KASSERT((fdvp == fvp) || (VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE)); 4357 /* 4358 * Bracket the operation with fstrans_start()/fstrans_done(). 4359 * 4360 * Inside the bracket this file system cannot be unmounted so 4361 * a vnode on this file system cannot change its v_mount. 4362 * A vnode on another file system may still change to dead mount. 4363 */ 4364 fstrans_start(mp); 4365 4366 /* 4367 * Make sure neither fdvp nor fvp is locked. 4368 */ 4369 if (fdvp != fvp) 4370 VOP_UNLOCK(fdvp); 4371 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4372 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4373 4374 /* 4375 * Reject renaming `.' and `..'. Can't do this until after 4376 * namei because we need namei's parsing to find the final 4377 * component name. (namei should just leave us with the final 4378 * component name and not look it up itself, but anyway...) 4379 * 4380 * This was here before because we used to relookup from 4381 * instead of to and relookup requires the caller to check 4382 * this, but now file systems may depend on this check, so we 4383 * must retain it until the file systems are all rototilled. 4384 */ 4385 if (((fnd.ni_cnd.cn_namelen == 1) && 4386 (fnd.ni_cnd.cn_nameptr[0] == '.')) || 4387 ((fnd.ni_cnd.cn_namelen == 2) && 4388 (fnd.ni_cnd.cn_nameptr[0] == '.') && 4389 (fnd.ni_cnd.cn_nameptr[1] == '.'))) { 4390 error = EINVAL; /* XXX EISDIR? */ 4391 goto abort0; 4392 } 4393 4394 /* 4395 * Lookup to. 4396 * 4397 * XXX LOCKPARENT is wrong, but...insanity, &c. Also, using 4398 * fvp here to decide whether to add CREATEDIR is a load of 4399 * bollocks because fvp might be the wrong node by now, since 4400 * fdvp is unlocked. 4401 * 4402 * XXX Why not pass CREATEDIR always? 4403 */ 4404 NDINIT(&tnd, RENAME, 4405 (LOCKPARENT | NOCACHE | TRYEMULROOT | 4406 ((fvp->v_type == VDIR)? CREATEDIR : 0)), 4407 tpb); 4408 if ((error = fd_nameiat(l, tofd, &tnd)) != 0) 4409 goto abort0; 4410 4411 /* 4412 * Pull out the important results of the lookup, tdvp and tvp. 4413 * Of course, tvp is bogus because we're about to unlock tdvp. 4414 */ 4415 tdvp = tnd.ni_dvp; 4416 tvp = tnd.ni_vp; 4417 KASSERT(tdvp != NULL); 4418 KASSERT((tdvp == tvp) || (VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE)); 4419 4420 if (fvp->v_type == VDIR) 4421 tnd.ni_cnd.cn_flags |= WILLBEDIR; 4422 /* 4423 * Make sure neither tdvp nor tvp is locked. 4424 */ 4425 if (tdvp != tvp) 4426 VOP_UNLOCK(tdvp); 4427 /* XXX KASSERT(VOP_ISLOCKED(tdvp) != LK_EXCLUSIVE); */ 4428 /* XXX KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) != LK_EXCLUSIVE)); */ 4429 4430 /* 4431 * Reject renaming onto `.' or `..'. relookup is unhappy with 4432 * these, which is why we must do this here. Once upon a time 4433 * we relooked up from instead of to, and consequently didn't 4434 * need this check, but now that we relookup to instead of 4435 * from, we need this; and we shall need it forever forward 4436 * until the VOP_RENAME protocol changes, because file systems 4437 * will no doubt begin to depend on this check. 4438 */ 4439 if ((tnd.ni_cnd.cn_namelen == 1) && (tnd.ni_cnd.cn_nameptr[0] == '.')) { 4440 error = EISDIR; 4441 goto abort1; 4442 } 4443 if ((tnd.ni_cnd.cn_namelen == 2) && 4444 (tnd.ni_cnd.cn_nameptr[0] == '.') && 4445 (tnd.ni_cnd.cn_nameptr[1] == '.')) { 4446 error = EINVAL; 4447 goto abort1; 4448 } 4449 4450 /* 4451 * Make sure the mount points match. Although we don't hold 4452 * any vnode locks, the v_mount on fdvp file system are stable. 4453 * 4454 * Unmounting another file system at an inopportune moment may 4455 * cause tdvp to disappear and change its v_mount to dead. 4456 * 4457 * So in either case different v_mount means cross-device rename. 4458 */ 4459 KASSERT(mp != NULL); 4460 tmp = tdvp->v_mount; 4461 4462 if (mp != tmp) { 4463 error = EXDEV; 4464 goto abort1; 4465 } 4466 4467 /* 4468 * Take the vfs rename lock to avoid cross-directory screw cases. 4469 * Nothing is locked currently, so taking this lock is safe. 4470 */ 4471 error = VFS_RENAMELOCK_ENTER(mp); 4472 if (error) 4473 goto abort1; 4474 4475 /* 4476 * Now fdvp, fvp, tdvp, and (if nonnull) tvp are referenced, 4477 * and nothing is locked except for the vfs rename lock. 4478 * 4479 * The next step is a little rain dance to conform to the 4480 * insane lock protocol, even though it does nothing to ward 4481 * off race conditions. 4482 * 4483 * We need tdvp and tvp to be locked. However, because we have 4484 * unlocked tdvp in order to hold no locks while we take the 4485 * vfs rename lock, tvp may be wrong here, and we can't safely 4486 * lock it even if the sensible file systems will just unlock 4487 * it straight away. Consequently, we must lock tdvp and then 4488 * relookup tvp to get it locked. 4489 * 4490 * Finally, because the VOP_RENAME protocol is brain-damaged 4491 * and various file systems insanely depend on the semantics of 4492 * this brain damage, the lookup of to must be the last lookup 4493 * before VOP_RENAME. 4494 */ 4495 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 4496 error = relookup(tdvp, &tnd.ni_vp, &tnd.ni_cnd, 0); 4497 if (error) 4498 goto abort2; 4499 4500 /* 4501 * Drop the old tvp and pick up the new one -- which might be 4502 * the same, but that doesn't matter to us. After this, tdvp 4503 * and tvp should both be locked. 4504 */ 4505 if (tvp != NULL) 4506 vrele(tvp); 4507 tvp = tnd.ni_vp; 4508 KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 4509 KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 4510 4511 /* 4512 * The old do_sys_rename had various consistency checks here 4513 * involving fvp and tvp. fvp is bogus already here, and tvp 4514 * will become bogus soon in any sensible file system, so the 4515 * only purpose in putting these checks here is to give lip 4516 * service to these screw cases and to acknowledge that they 4517 * exist, not actually to handle them, but here you go 4518 * anyway... 4519 */ 4520 4521 /* 4522 * Acknowledge that directories and non-directories aren't 4523 * suposed to mix. 4524 */ 4525 if (tvp != NULL) { 4526 if ((fvp->v_type == VDIR) && (tvp->v_type != VDIR)) { 4527 error = ENOTDIR; 4528 goto abort3; 4529 } else if ((fvp->v_type != VDIR) && (tvp->v_type == VDIR)) { 4530 error = EISDIR; 4531 goto abort3; 4532 } 4533 } 4534 4535 /* 4536 * Acknowledge some random screw case, among the dozens that 4537 * might arise. 4538 */ 4539 if (fvp == tdvp) { 4540 error = EINVAL; 4541 goto abort3; 4542 } 4543 4544 /* 4545 * Acknowledge that POSIX has a wacky screw case. 4546 * 4547 * XXX Eventually the retain flag needs to be passed on to 4548 * VOP_RENAME. 4549 */ 4550 if (fvp == tvp) { 4551 if (retain) { 4552 error = 0; 4553 goto abort3; 4554 } else if ((fdvp == tdvp) && 4555 (fnd.ni_cnd.cn_namelen == tnd.ni_cnd.cn_namelen) && 4556 (0 == memcmp(fnd.ni_cnd.cn_nameptr, tnd.ni_cnd.cn_nameptr, 4557 fnd.ni_cnd.cn_namelen))) { 4558 error = 0; 4559 goto abort3; 4560 } 4561 } 4562 4563 /* 4564 * Make sure veriexec can screw us up. (But a race can screw 4565 * up veriexec, of course -- remember, fvp and (soon) tvp are 4566 * bogus.) 4567 */ 4568 #if NVERIEXEC > 0 4569 { 4570 char *f1, *f2; 4571 size_t f1_len; 4572 size_t f2_len; 4573 4574 f1_len = fnd.ni_cnd.cn_namelen + 1; 4575 f1 = kmem_alloc(f1_len, KM_SLEEP); 4576 strlcpy(f1, fnd.ni_cnd.cn_nameptr, f1_len); 4577 4578 f2_len = tnd.ni_cnd.cn_namelen + 1; 4579 f2 = kmem_alloc(f2_len, KM_SLEEP); 4580 strlcpy(f2, tnd.ni_cnd.cn_nameptr, f2_len); 4581 4582 error = veriexec_renamechk(curlwp, fvp, f1, tvp, f2); 4583 4584 kmem_free(f1, f1_len); 4585 kmem_free(f2, f2_len); 4586 4587 if (error) 4588 goto abort3; 4589 } 4590 #endif /* NVERIEXEC > 0 */ 4591 4592 /* 4593 * All ready. Incant the rename vop. 4594 */ 4595 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4596 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4597 KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 4598 KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 4599 error = VOP_RENAME(fdvp, fvp, &fnd.ni_cnd, tdvp, tvp, &tnd.ni_cnd); 4600 4601 /* 4602 * VOP_RENAME releases fdvp, fvp, tdvp, and tvp, and unlocks 4603 * tdvp and tvp. But we can't assert any of that. 4604 */ 4605 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4606 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4607 /* XXX KASSERT(VOP_ISLOCKED(tdvp) != LK_EXCLUSIVE); */ 4608 /* XXX KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) != LK_EXCLUSIVE)); */ 4609 4610 /* 4611 * So all we have left to do is to drop the rename lock and 4612 * destroy the pathbufs. 4613 */ 4614 VFS_RENAMELOCK_EXIT(mp); 4615 fstrans_done(mp); 4616 goto out2; 4617 4618 abort3: if ((tvp != NULL) && (tvp != tdvp)) 4619 VOP_UNLOCK(tvp); 4620 abort2: VOP_UNLOCK(tdvp); 4621 VFS_RENAMELOCK_EXIT(mp); 4622 abort1: VOP_ABORTOP(tdvp, &tnd.ni_cnd); 4623 vrele(tdvp); 4624 if (tvp != NULL) 4625 vrele(tvp); 4626 abort0: VOP_ABORTOP(fdvp, &fnd.ni_cnd); 4627 vrele(fdvp); 4628 vrele(fvp); 4629 fstrans_done(mp); 4630 out2: pathbuf_destroy(tpb); 4631 out1: pathbuf_destroy(fpb); 4632 out0: return error; 4633 } 4634 4635 /* 4636 * Make a directory file. 4637 */ 4638 /* ARGSUSED */ 4639 int 4640 sys_mkdir(struct lwp *l, const struct sys_mkdir_args *uap, register_t *retval) 4641 { 4642 /* { 4643 syscallarg(const char *) path; 4644 syscallarg(int) mode; 4645 } */ 4646 4647 return do_sys_mkdirat(l, AT_FDCWD, SCARG(uap, path), 4648 SCARG(uap, mode), UIO_USERSPACE); 4649 } 4650 4651 int 4652 sys_mkdirat(struct lwp *l, const struct sys_mkdirat_args *uap, 4653 register_t *retval) 4654 { 4655 /* { 4656 syscallarg(int) fd; 4657 syscallarg(const char *) path; 4658 syscallarg(int) mode; 4659 } */ 4660 4661 return do_sys_mkdirat(l, SCARG(uap, fd), SCARG(uap, path), 4662 SCARG(uap, mode), UIO_USERSPACE); 4663 } 4664 4665 4666 int 4667 do_sys_mkdir(const char *path, mode_t mode, enum uio_seg seg) 4668 { 4669 return do_sys_mkdirat(NULL, AT_FDCWD, path, mode, seg); 4670 } 4671 4672 static int 4673 do_sys_mkdirat(struct lwp *l, int fdat, const char *path, mode_t mode, 4674 enum uio_seg seg) 4675 { 4676 struct proc *p = curlwp->l_proc; 4677 struct vnode *vp; 4678 struct vattr vattr; 4679 int error; 4680 struct pathbuf *pb; 4681 struct nameidata nd; 4682 4683 KASSERT(l != NULL || fdat == AT_FDCWD); 4684 4685 /* XXX bollocks, should pass in a pathbuf */ 4686 error = pathbuf_maybe_copyin(path, seg, &pb); 4687 if (error) { 4688 return error; 4689 } 4690 4691 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT, pb); 4692 4693 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 4694 pathbuf_destroy(pb); 4695 return (error); 4696 } 4697 vp = nd.ni_vp; 4698 if (vp != NULL) { 4699 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 4700 if (nd.ni_dvp == vp) 4701 vrele(nd.ni_dvp); 4702 else 4703 vput(nd.ni_dvp); 4704 vrele(vp); 4705 pathbuf_destroy(pb); 4706 return (EEXIST); 4707 } 4708 vattr_null(&vattr); 4709 vattr.va_type = VDIR; 4710 /* We will read cwdi->cwdi_cmask unlocked. */ 4711 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 4712 nd.ni_cnd.cn_flags |= WILLBEDIR; 4713 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 4714 if (!error) 4715 vrele(nd.ni_vp); 4716 vput(nd.ni_dvp); 4717 pathbuf_destroy(pb); 4718 return (error); 4719 } 4720 4721 /* 4722 * Remove a directory file. 4723 */ 4724 /* ARGSUSED */ 4725 int 4726 sys_rmdir(struct lwp *l, const struct sys_rmdir_args *uap, register_t *retval) 4727 { 4728 return do_sys_unlinkat(l, AT_FDCWD, SCARG(uap, path), 4729 AT_REMOVEDIR, UIO_USERSPACE); 4730 } 4731 4732 /* 4733 * Read a block of directory entries in a file system independent format. 4734 */ 4735 int 4736 sys___getdents30(struct lwp *l, const struct sys___getdents30_args *uap, register_t *retval) 4737 { 4738 /* { 4739 syscallarg(int) fd; 4740 syscallarg(char *) buf; 4741 syscallarg(size_t) count; 4742 } */ 4743 file_t *fp; 4744 int error, done; 4745 4746 /* fd_getvnode() will use the descriptor for us */ 4747 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4748 return (error); 4749 if ((fp->f_flag & FREAD) == 0) { 4750 error = EBADF; 4751 goto out; 4752 } 4753 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 4754 SCARG(uap, count), &done, l, 0, 0); 4755 ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, buf), done, error); 4756 *retval = done; 4757 out: 4758 fd_putfile(SCARG(uap, fd)); 4759 return (error); 4760 } 4761 4762 /* 4763 * Set the mode mask for creation of filesystem nodes. 4764 */ 4765 int 4766 sys_umask(struct lwp *l, const struct sys_umask_args *uap, register_t *retval) 4767 { 4768 /* { 4769 syscallarg(mode_t) newmask; 4770 } */ 4771 4772 /* 4773 * cwdi->cwdi_cmask will be read unlocked elsewhere, and no kind of 4774 * serialization with those reads is required. It's important to 4775 * return a coherent answer for the caller of umask() though, and 4776 * the atomic operation accomplishes that. 4777 */ 4778 *retval = atomic_swap_uint(&curproc->p_cwdi->cwdi_cmask, 4779 SCARG(uap, newmask) & ALLPERMS); 4780 4781 return (0); 4782 } 4783 4784 int 4785 dorevoke(struct vnode *vp, kauth_cred_t cred) 4786 { 4787 struct vattr vattr; 4788 int error, fs_decision; 4789 4790 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4791 error = VOP_GETATTR(vp, &vattr, cred); 4792 VOP_UNLOCK(vp); 4793 if (error != 0) 4794 return error; 4795 fs_decision = (kauth_cred_geteuid(cred) == vattr.va_uid) ? 0 : EPERM; 4796 error = kauth_authorize_vnode(cred, KAUTH_VNODE_REVOKE, vp, NULL, 4797 fs_decision); 4798 if (!error) 4799 VOP_REVOKE(vp, REVOKEALL); 4800 return (error); 4801 } 4802 4803 /* 4804 * Void all references to file by ripping underlying filesystem 4805 * away from vnode. 4806 */ 4807 /* ARGSUSED */ 4808 int 4809 sys_revoke(struct lwp *l, const struct sys_revoke_args *uap, register_t *retval) 4810 { 4811 /* { 4812 syscallarg(const char *) path; 4813 } */ 4814 struct vnode *vp; 4815 int error; 4816 4817 error = namei_simple_user(SCARG(uap, path), 4818 NSM_FOLLOW_TRYEMULROOT, &vp); 4819 if (error != 0) 4820 return (error); 4821 error = dorevoke(vp, l->l_cred); 4822 vrele(vp); 4823 return (error); 4824 } 4825 4826 /* 4827 * Allocate backing store for a file, filling a hole without having to 4828 * explicitly write anything out. 4829 */ 4830 /* ARGSUSED */ 4831 int 4832 sys_posix_fallocate(struct lwp *l, const struct sys_posix_fallocate_args *uap, 4833 register_t *retval) 4834 { 4835 /* { 4836 syscallarg(int) fd; 4837 syscallarg(off_t) pos; 4838 syscallarg(off_t) len; 4839 } */ 4840 int fd; 4841 off_t pos, len; 4842 struct file *fp; 4843 struct vnode *vp; 4844 int error; 4845 4846 fd = SCARG(uap, fd); 4847 pos = SCARG(uap, pos); 4848 len = SCARG(uap, len); 4849 4850 if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) { 4851 *retval = EINVAL; 4852 return 0; 4853 } 4854 4855 error = fd_getvnode(fd, &fp); 4856 if (error) { 4857 *retval = error; 4858 return 0; 4859 } 4860 if ((fp->f_flag & FWRITE) == 0) { 4861 error = EBADF; 4862 goto fail; 4863 } 4864 vp = fp->f_vnode; 4865 4866 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4867 if (vp->v_type == VDIR) { 4868 error = EISDIR; 4869 } else { 4870 error = VOP_FALLOCATE(vp, pos, len); 4871 } 4872 VOP_UNLOCK(vp); 4873 4874 fail: 4875 fd_putfile(fd); 4876 *retval = error; 4877 return 0; 4878 } 4879 4880 /* 4881 * Deallocate backing store for a file, creating a hole. Also used for 4882 * invoking TRIM on disks. 4883 */ 4884 /* ARGSUSED */ 4885 int 4886 sys_fdiscard(struct lwp *l, const struct sys_fdiscard_args *uap, 4887 register_t *retval) 4888 { 4889 /* { 4890 syscallarg(int) fd; 4891 syscallarg(off_t) pos; 4892 syscallarg(off_t) len; 4893 } */ 4894 int fd; 4895 off_t pos, len; 4896 struct file *fp; 4897 struct vnode *vp; 4898 int error; 4899 4900 fd = SCARG(uap, fd); 4901 pos = SCARG(uap, pos); 4902 len = SCARG(uap, len); 4903 4904 if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) { 4905 return EINVAL; 4906 } 4907 4908 error = fd_getvnode(fd, &fp); 4909 if (error) { 4910 return error; 4911 } 4912 if ((fp->f_flag & FWRITE) == 0) { 4913 error = EBADF; 4914 goto fail; 4915 } 4916 vp = fp->f_vnode; 4917 4918 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4919 if (vp->v_type == VDIR) { 4920 error = EISDIR; 4921 } else { 4922 error = VOP_FDISCARD(vp, pos, len); 4923 } 4924 VOP_UNLOCK(vp); 4925 4926 fail: 4927 fd_putfile(fd); 4928 return error; 4929 } 4930
Indexes created Fri Oct 03 02:09:57 GMT 2025