vfs_syscalls.c revision 1.533
1 /* $NetBSD: vfs_syscalls.c,v 1.533 2019/07/06 14:37:24 maxv Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * (c) UNIX System Laboratories, Inc. 36 * All or some portions of this file are derived from material licensed 37 * to the University of California by American Telephone and Telegraph 38 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 39 * the permission of UNIX System Laboratories, Inc. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 66 */ 67 68 /* 69 * Virtual File System System Calls 70 */ 71 72 #include <sys/cdefs.h> 73 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.533 2019/07/06 14:37:24 maxv 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 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 /* ARGSUSED */ 676 int 677 sys_sync(struct lwp *l, const void *v, register_t *retval) 678 { 679 do_sys_sync(l); 680 return (0); 681 } 682 683 684 /* 685 * Access or change filesystem quotas. 686 * 687 * (this is really 14 different calls bundled into one) 688 */ 689 690 static int 691 do_sys_quotactl_stat(struct mount *mp, struct quotastat *info_u) 692 { 693 struct quotastat info_k; 694 int error; 695 696 /* ensure any padding bytes are cleared */ 697 memset(&info_k, 0, sizeof(info_k)); 698 699 error = vfs_quotactl_stat(mp, &info_k); 700 if (error) { 701 return error; 702 } 703 704 return copyout(&info_k, info_u, sizeof(info_k)); 705 } 706 707 static int 708 do_sys_quotactl_idtypestat(struct mount *mp, int idtype, 709 struct quotaidtypestat *info_u) 710 { 711 struct quotaidtypestat info_k; 712 int error; 713 714 /* ensure any padding bytes are cleared */ 715 memset(&info_k, 0, sizeof(info_k)); 716 717 error = vfs_quotactl_idtypestat(mp, idtype, &info_k); 718 if (error) { 719 return error; 720 } 721 722 return copyout(&info_k, info_u, sizeof(info_k)); 723 } 724 725 static int 726 do_sys_quotactl_objtypestat(struct mount *mp, int objtype, 727 struct quotaobjtypestat *info_u) 728 { 729 struct quotaobjtypestat info_k; 730 int error; 731 732 /* ensure any padding bytes are cleared */ 733 memset(&info_k, 0, sizeof(info_k)); 734 735 error = vfs_quotactl_objtypestat(mp, objtype, &info_k); 736 if (error) { 737 return error; 738 } 739 740 return copyout(&info_k, info_u, sizeof(info_k)); 741 } 742 743 static int 744 do_sys_quotactl_get(struct mount *mp, const struct quotakey *key_u, 745 struct quotaval *val_u) 746 { 747 struct quotakey key_k; 748 struct quotaval val_k; 749 int error; 750 751 /* ensure any padding bytes are cleared */ 752 memset(&val_k, 0, sizeof(val_k)); 753 754 error = copyin(key_u, &key_k, sizeof(key_k)); 755 if (error) { 756 return error; 757 } 758 759 error = vfs_quotactl_get(mp, &key_k, &val_k); 760 if (error) { 761 return error; 762 } 763 764 return copyout(&val_k, val_u, sizeof(val_k)); 765 } 766 767 static int 768 do_sys_quotactl_put(struct mount *mp, const struct quotakey *key_u, 769 const struct quotaval *val_u) 770 { 771 struct quotakey key_k; 772 struct quotaval val_k; 773 int error; 774 775 error = copyin(key_u, &key_k, sizeof(key_k)); 776 if (error) { 777 return error; 778 } 779 780 error = copyin(val_u, &val_k, sizeof(val_k)); 781 if (error) { 782 return error; 783 } 784 785 return vfs_quotactl_put(mp, &key_k, &val_k); 786 } 787 788 static int 789 do_sys_quotactl_del(struct mount *mp, const struct quotakey *key_u) 790 { 791 struct quotakey key_k; 792 int error; 793 794 error = copyin(key_u, &key_k, sizeof(key_k)); 795 if (error) { 796 return error; 797 } 798 799 return vfs_quotactl_del(mp, &key_k); 800 } 801 802 static int 803 do_sys_quotactl_cursoropen(struct mount *mp, struct quotakcursor *cursor_u) 804 { 805 struct quotakcursor cursor_k; 806 int error; 807 808 /* ensure any padding bytes are cleared */ 809 memset(&cursor_k, 0, sizeof(cursor_k)); 810 811 error = vfs_quotactl_cursoropen(mp, &cursor_k); 812 if (error) { 813 return error; 814 } 815 816 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 817 } 818 819 static int 820 do_sys_quotactl_cursorclose(struct mount *mp, struct quotakcursor *cursor_u) 821 { 822 struct quotakcursor cursor_k; 823 int error; 824 825 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 826 if (error) { 827 return error; 828 } 829 830 return vfs_quotactl_cursorclose(mp, &cursor_k); 831 } 832 833 static int 834 do_sys_quotactl_cursorskipidtype(struct mount *mp, 835 struct quotakcursor *cursor_u, int idtype) 836 { 837 struct quotakcursor cursor_k; 838 int error; 839 840 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 841 if (error) { 842 return error; 843 } 844 845 error = vfs_quotactl_cursorskipidtype(mp, &cursor_k, idtype); 846 if (error) { 847 return error; 848 } 849 850 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 851 } 852 853 static int 854 do_sys_quotactl_cursorget(struct mount *mp, struct quotakcursor *cursor_u, 855 struct quotakey *keys_u, struct quotaval *vals_u, unsigned maxnum, 856 unsigned *ret_u) 857 { 858 #define CGET_STACK_MAX 8 859 struct quotakcursor cursor_k; 860 struct quotakey stackkeys[CGET_STACK_MAX]; 861 struct quotaval stackvals[CGET_STACK_MAX]; 862 struct quotakey *keys_k; 863 struct quotaval *vals_k; 864 unsigned ret_k; 865 int error; 866 867 if (maxnum > 128) { 868 maxnum = 128; 869 } 870 871 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 872 if (error) { 873 return error; 874 } 875 876 if (maxnum <= CGET_STACK_MAX) { 877 keys_k = stackkeys; 878 vals_k = stackvals; 879 /* ensure any padding bytes are cleared */ 880 memset(keys_k, 0, maxnum * sizeof(keys_k[0])); 881 memset(vals_k, 0, maxnum * sizeof(vals_k[0])); 882 } else { 883 keys_k = kmem_zalloc(maxnum * sizeof(keys_k[0]), KM_SLEEP); 884 vals_k = kmem_zalloc(maxnum * sizeof(vals_k[0]), KM_SLEEP); 885 } 886 887 error = vfs_quotactl_cursorget(mp, &cursor_k, keys_k, vals_k, maxnum, 888 &ret_k); 889 if (error) { 890 goto fail; 891 } 892 893 error = copyout(keys_k, keys_u, ret_k * sizeof(keys_k[0])); 894 if (error) { 895 goto fail; 896 } 897 898 error = copyout(vals_k, vals_u, ret_k * sizeof(vals_k[0])); 899 if (error) { 900 goto fail; 901 } 902 903 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 904 if (error) { 905 goto fail; 906 } 907 908 /* do last to maximize the chance of being able to recover a failure */ 909 error = copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 910 911 fail: 912 if (keys_k != stackkeys) { 913 kmem_free(keys_k, maxnum * sizeof(keys_k[0])); 914 } 915 if (vals_k != stackvals) { 916 kmem_free(vals_k, maxnum * sizeof(vals_k[0])); 917 } 918 return error; 919 } 920 921 static int 922 do_sys_quotactl_cursoratend(struct mount *mp, struct quotakcursor *cursor_u, 923 int *ret_u) 924 { 925 struct quotakcursor cursor_k; 926 int ret_k; 927 int error; 928 929 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 930 if (error) { 931 return error; 932 } 933 934 error = vfs_quotactl_cursoratend(mp, &cursor_k, &ret_k); 935 if (error) { 936 return error; 937 } 938 939 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 940 if (error) { 941 return error; 942 } 943 944 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 945 } 946 947 static int 948 do_sys_quotactl_cursorrewind(struct mount *mp, struct quotakcursor *cursor_u) 949 { 950 struct quotakcursor cursor_k; 951 int error; 952 953 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 954 if (error) { 955 return error; 956 } 957 958 error = vfs_quotactl_cursorrewind(mp, &cursor_k); 959 if (error) { 960 return error; 961 } 962 963 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 964 } 965 966 static int 967 do_sys_quotactl_quotaon(struct mount *mp, int idtype, const char *path_u) 968 { 969 char *path_k; 970 int error; 971 972 /* XXX this should probably be a struct pathbuf */ 973 path_k = PNBUF_GET(); 974 error = copyin(path_u, path_k, PATH_MAX); 975 if (error) { 976 PNBUF_PUT(path_k); 977 return error; 978 } 979 980 error = vfs_quotactl_quotaon(mp, idtype, path_k); 981 982 PNBUF_PUT(path_k); 983 return error; 984 } 985 986 static int 987 do_sys_quotactl_quotaoff(struct mount *mp, int idtype) 988 { 989 return vfs_quotactl_quotaoff(mp, idtype); 990 } 991 992 int 993 do_sys_quotactl(const char *path_u, const struct quotactl_args *args) 994 { 995 struct mount *mp; 996 struct vnode *vp; 997 int error; 998 999 error = namei_simple_user(path_u, NSM_FOLLOW_TRYEMULROOT, &vp); 1000 if (error != 0) 1001 return (error); 1002 mp = vp->v_mount; 1003 1004 switch (args->qc_op) { 1005 case QUOTACTL_STAT: 1006 error = do_sys_quotactl_stat(mp, args->u.stat.qc_info); 1007 break; 1008 case QUOTACTL_IDTYPESTAT: 1009 error = do_sys_quotactl_idtypestat(mp, 1010 args->u.idtypestat.qc_idtype, 1011 args->u.idtypestat.qc_info); 1012 break; 1013 case QUOTACTL_OBJTYPESTAT: 1014 error = do_sys_quotactl_objtypestat(mp, 1015 args->u.objtypestat.qc_objtype, 1016 args->u.objtypestat.qc_info); 1017 break; 1018 case QUOTACTL_GET: 1019 error = do_sys_quotactl_get(mp, 1020 args->u.get.qc_key, 1021 args->u.get.qc_val); 1022 break; 1023 case QUOTACTL_PUT: 1024 error = do_sys_quotactl_put(mp, 1025 args->u.put.qc_key, 1026 args->u.put.qc_val); 1027 break; 1028 case QUOTACTL_DEL: 1029 error = do_sys_quotactl_del(mp, args->u.del.qc_key); 1030 break; 1031 case QUOTACTL_CURSOROPEN: 1032 error = do_sys_quotactl_cursoropen(mp, 1033 args->u.cursoropen.qc_cursor); 1034 break; 1035 case QUOTACTL_CURSORCLOSE: 1036 error = do_sys_quotactl_cursorclose(mp, 1037 args->u.cursorclose.qc_cursor); 1038 break; 1039 case QUOTACTL_CURSORSKIPIDTYPE: 1040 error = do_sys_quotactl_cursorskipidtype(mp, 1041 args->u.cursorskipidtype.qc_cursor, 1042 args->u.cursorskipidtype.qc_idtype); 1043 break; 1044 case QUOTACTL_CURSORGET: 1045 error = do_sys_quotactl_cursorget(mp, 1046 args->u.cursorget.qc_cursor, 1047 args->u.cursorget.qc_keys, 1048 args->u.cursorget.qc_vals, 1049 args->u.cursorget.qc_maxnum, 1050 args->u.cursorget.qc_ret); 1051 break; 1052 case QUOTACTL_CURSORATEND: 1053 error = do_sys_quotactl_cursoratend(mp, 1054 args->u.cursoratend.qc_cursor, 1055 args->u.cursoratend.qc_ret); 1056 break; 1057 case QUOTACTL_CURSORREWIND: 1058 error = do_sys_quotactl_cursorrewind(mp, 1059 args->u.cursorrewind.qc_cursor); 1060 break; 1061 case QUOTACTL_QUOTAON: 1062 error = do_sys_quotactl_quotaon(mp, 1063 args->u.quotaon.qc_idtype, 1064 args->u.quotaon.qc_quotafile); 1065 break; 1066 case QUOTACTL_QUOTAOFF: 1067 error = do_sys_quotactl_quotaoff(mp, 1068 args->u.quotaoff.qc_idtype); 1069 break; 1070 default: 1071 error = EINVAL; 1072 break; 1073 } 1074 1075 vrele(vp); 1076 return error; 1077 } 1078 1079 /* ARGSUSED */ 1080 int 1081 sys___quotactl(struct lwp *l, const struct sys___quotactl_args *uap, 1082 register_t *retval) 1083 { 1084 /* { 1085 syscallarg(const char *) path; 1086 syscallarg(struct quotactl_args *) args; 1087 } */ 1088 struct quotactl_args args; 1089 int error; 1090 1091 error = copyin(SCARG(uap, args), &args, sizeof(args)); 1092 if (error) { 1093 return error; 1094 } 1095 1096 return do_sys_quotactl(SCARG(uap, path), &args); 1097 } 1098 1099 int 1100 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 1101 int root) 1102 { 1103 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 1104 int error = 0; 1105 1106 /* 1107 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1108 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 1109 * overrides MNT_NOWAIT. 1110 */ 1111 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 1112 (flags != MNT_WAIT && flags != 0)) { 1113 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 1114 goto done; 1115 } 1116 1117 /* Get the filesystem stats now */ 1118 memset(sp, 0, sizeof(*sp)); 1119 if ((error = VFS_STATVFS(mp, sp)) != 0) { 1120 return error; 1121 } 1122 1123 if (cwdi->cwdi_rdir == NULL) 1124 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 1125 done: 1126 if (cwdi->cwdi_rdir != NULL) { 1127 size_t len; 1128 char *bp; 1129 char c; 1130 char *path = PNBUF_GET(); 1131 1132 bp = path + MAXPATHLEN; 1133 *--bp = '\0'; 1134 rw_enter(&cwdi->cwdi_lock, RW_READER); 1135 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 1136 MAXPATHLEN / 2, 0, l); 1137 rw_exit(&cwdi->cwdi_lock); 1138 if (error) { 1139 PNBUF_PUT(path); 1140 return error; 1141 } 1142 len = strlen(bp); 1143 if (len != 1) { 1144 /* 1145 * for mount points that are below our root, we can see 1146 * them, so we fix up the pathname and return them. The 1147 * rest we cannot see, so we don't allow viewing the 1148 * data. 1149 */ 1150 if (strncmp(bp, sp->f_mntonname, len) == 0 && 1151 ((c = sp->f_mntonname[len]) == '/' || c == '\0')) { 1152 (void)strlcpy(sp->f_mntonname, 1153 c == '\0' ? "/" : &sp->f_mntonname[len], 1154 sizeof(sp->f_mntonname)); 1155 } else { 1156 if (root) 1157 (void)strlcpy(sp->f_mntonname, "/", 1158 sizeof(sp->f_mntonname)); 1159 else 1160 error = EPERM; 1161 } 1162 } 1163 PNBUF_PUT(path); 1164 } 1165 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 1166 return error; 1167 } 1168 1169 /* 1170 * Get filesystem statistics by path. 1171 */ 1172 int 1173 do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb) 1174 { 1175 struct mount *mp; 1176 int error; 1177 struct vnode *vp; 1178 1179 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 1180 if (error != 0) 1181 return error; 1182 mp = vp->v_mount; 1183 error = dostatvfs(mp, sb, l, flags, 1); 1184 vrele(vp); 1185 return error; 1186 } 1187 1188 /* ARGSUSED */ 1189 int 1190 sys_statvfs1(struct lwp *l, const struct sys_statvfs1_args *uap, register_t *retval) 1191 { 1192 /* { 1193 syscallarg(const char *) path; 1194 syscallarg(struct statvfs *) buf; 1195 syscallarg(int) flags; 1196 } */ 1197 struct statvfs *sb; 1198 int error; 1199 1200 sb = STATVFSBUF_GET(); 1201 error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb); 1202 if (error == 0) 1203 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1204 STATVFSBUF_PUT(sb); 1205 return error; 1206 } 1207 1208 /* 1209 * Get filesystem statistics by fd. 1210 */ 1211 int 1212 do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb) 1213 { 1214 file_t *fp; 1215 struct mount *mp; 1216 int error; 1217 1218 /* fd_getvnode() will use the descriptor for us */ 1219 if ((error = fd_getvnode(fd, &fp)) != 0) 1220 return (error); 1221 mp = fp->f_vnode->v_mount; 1222 error = dostatvfs(mp, sb, curlwp, flags, 1); 1223 fd_putfile(fd); 1224 return error; 1225 } 1226 1227 /* ARGSUSED */ 1228 int 1229 sys_fstatvfs1(struct lwp *l, const struct sys_fstatvfs1_args *uap, register_t *retval) 1230 { 1231 /* { 1232 syscallarg(int) fd; 1233 syscallarg(struct statvfs *) buf; 1234 syscallarg(int) flags; 1235 } */ 1236 struct statvfs *sb; 1237 int error; 1238 1239 sb = STATVFSBUF_GET(); 1240 error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb); 1241 if (error == 0) 1242 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1243 STATVFSBUF_PUT(sb); 1244 return error; 1245 } 1246 1247 1248 /* 1249 * Get statistics on all filesystems. 1250 */ 1251 int 1252 do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags, 1253 int (*copyfn)(const void *, void *, size_t), size_t entry_sz, 1254 register_t *retval) 1255 { 1256 int root = 0; 1257 mount_iterator_t *iter; 1258 struct proc *p = l->l_proc; 1259 struct mount *mp; 1260 struct statvfs *sb; 1261 size_t count, maxcount; 1262 int error = 0; 1263 1264 sb = STATVFSBUF_GET(); 1265 maxcount = bufsize / entry_sz; 1266 count = 0; 1267 mountlist_iterator_init(&iter); 1268 while ((mp = mountlist_iterator_next(iter)) != NULL) { 1269 if (sfsp && count < maxcount) { 1270 error = dostatvfs(mp, sb, l, flags, 0); 1271 if (error) { 1272 error = 0; 1273 continue; 1274 } 1275 error = copyfn(sb, sfsp, entry_sz); 1276 if (error) 1277 goto out; 1278 sfsp = (char *)sfsp + entry_sz; 1279 root |= strcmp(sb->f_mntonname, "/") == 0; 1280 } 1281 count++; 1282 } 1283 1284 if (root == 0 && p->p_cwdi->cwdi_rdir) { 1285 /* 1286 * fake a root entry 1287 */ 1288 error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, 1289 sb, l, flags, 1); 1290 if (error != 0) 1291 goto out; 1292 if (sfsp) { 1293 error = copyfn(sb, sfsp, entry_sz); 1294 if (error != 0) 1295 goto out; 1296 } 1297 count++; 1298 } 1299 if (sfsp && count > maxcount) 1300 *retval = maxcount; 1301 else 1302 *retval = count; 1303 out: 1304 mountlist_iterator_destroy(iter); 1305 STATVFSBUF_PUT(sb); 1306 return error; 1307 } 1308 1309 int 1310 sys_getvfsstat(struct lwp *l, const struct sys_getvfsstat_args *uap, register_t *retval) 1311 { 1312 /* { 1313 syscallarg(struct statvfs *) buf; 1314 syscallarg(size_t) bufsize; 1315 syscallarg(int) flags; 1316 } */ 1317 1318 return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize), 1319 SCARG(uap, flags), copyout, sizeof (struct statvfs), retval); 1320 } 1321 1322 /* 1323 * Change current working directory to a given file descriptor. 1324 */ 1325 /* ARGSUSED */ 1326 int 1327 sys_fchdir(struct lwp *l, const struct sys_fchdir_args *uap, register_t *retval) 1328 { 1329 /* { 1330 syscallarg(int) fd; 1331 } */ 1332 struct proc *p = l->l_proc; 1333 struct cwdinfo *cwdi; 1334 struct vnode *vp, *tdp; 1335 struct mount *mp; 1336 file_t *fp; 1337 int error, fd; 1338 1339 /* fd_getvnode() will use the descriptor for us */ 1340 fd = SCARG(uap, fd); 1341 if ((error = fd_getvnode(fd, &fp)) != 0) 1342 return (error); 1343 vp = fp->f_vnode; 1344 1345 vref(vp); 1346 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1347 if (vp->v_type != VDIR) 1348 error = ENOTDIR; 1349 else 1350 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1351 if (error) { 1352 vput(vp); 1353 goto out; 1354 } 1355 while ((mp = vp->v_mountedhere) != NULL) { 1356 error = vfs_busy(mp); 1357 vput(vp); 1358 if (error != 0) 1359 goto out; 1360 error = VFS_ROOT(mp, &tdp); 1361 vfs_unbusy(mp); 1362 if (error) 1363 goto out; 1364 vp = tdp; 1365 } 1366 VOP_UNLOCK(vp); 1367 1368 /* 1369 * Disallow changing to a directory not under the process's 1370 * current root directory (if there is one). 1371 */ 1372 cwdi = p->p_cwdi; 1373 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1374 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 1375 vrele(vp); 1376 error = EPERM; /* operation not permitted */ 1377 } else { 1378 vrele(cwdi->cwdi_cdir); 1379 cwdi->cwdi_cdir = vp; 1380 } 1381 rw_exit(&cwdi->cwdi_lock); 1382 1383 out: 1384 fd_putfile(fd); 1385 return (error); 1386 } 1387 1388 /* 1389 * Change this process's notion of the root directory to a given file 1390 * descriptor. 1391 */ 1392 int 1393 sys_fchroot(struct lwp *l, const struct sys_fchroot_args *uap, register_t *retval) 1394 { 1395 struct proc *p = l->l_proc; 1396 struct vnode *vp; 1397 file_t *fp; 1398 int error, fd = SCARG(uap, fd); 1399 1400 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1401 KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) 1402 return error; 1403 /* fd_getvnode() will use the descriptor for us */ 1404 if ((error = fd_getvnode(fd, &fp)) != 0) 1405 return error; 1406 vp = fp->f_vnode; 1407 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1408 if (vp->v_type != VDIR) 1409 error = ENOTDIR; 1410 else 1411 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1412 VOP_UNLOCK(vp); 1413 if (error) 1414 goto out; 1415 vref(vp); 1416 1417 change_root(p->p_cwdi, vp, l); 1418 1419 out: 1420 fd_putfile(fd); 1421 return (error); 1422 } 1423 1424 /* 1425 * Change current working directory (``.''). 1426 */ 1427 /* ARGSUSED */ 1428 int 1429 sys_chdir(struct lwp *l, const struct sys_chdir_args *uap, register_t *retval) 1430 { 1431 /* { 1432 syscallarg(const char *) path; 1433 } */ 1434 struct proc *p = l->l_proc; 1435 struct cwdinfo *cwdi; 1436 int error; 1437 struct vnode *vp; 1438 1439 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1440 &vp, l)) != 0) 1441 return (error); 1442 cwdi = p->p_cwdi; 1443 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1444 vrele(cwdi->cwdi_cdir); 1445 cwdi->cwdi_cdir = vp; 1446 rw_exit(&cwdi->cwdi_lock); 1447 return (0); 1448 } 1449 1450 /* 1451 * Change notion of root (``/'') directory. 1452 */ 1453 /* ARGSUSED */ 1454 int 1455 sys_chroot(struct lwp *l, const struct sys_chroot_args *uap, register_t *retval) 1456 { 1457 /* { 1458 syscallarg(const char *) path; 1459 } */ 1460 struct proc *p = l->l_proc; 1461 int error; 1462 struct vnode *vp; 1463 1464 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1465 KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) 1466 return (error); 1467 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1468 &vp, l)) != 0) 1469 return (error); 1470 1471 change_root(p->p_cwdi, vp, l); 1472 1473 return (0); 1474 } 1475 1476 /* 1477 * Common routine for chroot and fchroot. 1478 * NB: callers need to properly authorize the change root operation. 1479 */ 1480 void 1481 change_root(struct cwdinfo *cwdi, struct vnode *vp, struct lwp *l) 1482 { 1483 struct proc *p = l->l_proc; 1484 kauth_cred_t ncred; 1485 1486 ncred = kauth_cred_alloc(); 1487 1488 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1489 if (cwdi->cwdi_rdir != NULL) 1490 vrele(cwdi->cwdi_rdir); 1491 cwdi->cwdi_rdir = vp; 1492 1493 /* 1494 * Prevent escaping from chroot by putting the root under 1495 * the working directory. Silently chdir to / if we aren't 1496 * already there. 1497 */ 1498 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1499 /* 1500 * XXX would be more failsafe to change directory to a 1501 * deadfs node here instead 1502 */ 1503 vrele(cwdi->cwdi_cdir); 1504 vref(vp); 1505 cwdi->cwdi_cdir = vp; 1506 } 1507 rw_exit(&cwdi->cwdi_lock); 1508 1509 /* Get a write lock on the process credential. */ 1510 proc_crmod_enter(); 1511 1512 kauth_cred_clone(p->p_cred, ncred); 1513 kauth_proc_chroot(ncred, p->p_cwdi); 1514 1515 /* Broadcast our credentials to the process and other LWPs. */ 1516 proc_crmod_leave(ncred, p->p_cred, true); 1517 } 1518 1519 /* 1520 * Common routine for chroot and chdir. 1521 * XXX "where" should be enum uio_seg 1522 */ 1523 int 1524 chdir_lookup(const char *path, int where, struct vnode **vpp, struct lwp *l) 1525 { 1526 struct pathbuf *pb; 1527 struct nameidata nd; 1528 int error; 1529 1530 error = pathbuf_maybe_copyin(path, where, &pb); 1531 if (error) { 1532 return error; 1533 } 1534 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1535 if ((error = namei(&nd)) != 0) { 1536 pathbuf_destroy(pb); 1537 return error; 1538 } 1539 *vpp = nd.ni_vp; 1540 pathbuf_destroy(pb); 1541 1542 if ((*vpp)->v_type != VDIR) 1543 error = ENOTDIR; 1544 else 1545 error = VOP_ACCESS(*vpp, VEXEC, l->l_cred); 1546 1547 if (error) 1548 vput(*vpp); 1549 else 1550 VOP_UNLOCK(*vpp); 1551 return (error); 1552 } 1553 1554 /* 1555 * Internals of sys_open - path has already been converted into a pathbuf 1556 * (so we can easily reuse this function from other parts of the kernel, 1557 * like posix_spawn post-processing). 1558 */ 1559 int 1560 do_open(lwp_t *l, struct vnode *dvp, struct pathbuf *pb, int open_flags, 1561 int open_mode, int *fd) 1562 { 1563 struct proc *p = l->l_proc; 1564 struct cwdinfo *cwdi = p->p_cwdi; 1565 file_t *fp; 1566 struct vnode *vp; 1567 int flags, cmode; 1568 int indx, error; 1569 struct nameidata nd; 1570 1571 if (open_flags & O_SEARCH) { 1572 open_flags &= ~(int)O_SEARCH; 1573 } 1574 1575 flags = FFLAGS(open_flags); 1576 if ((flags & (FREAD | FWRITE)) == 0) 1577 return EINVAL; 1578 1579 if ((error = fd_allocfile(&fp, &indx)) != 0) { 1580 return error; 1581 } 1582 1583 /* We're going to read cwdi->cwdi_cmask unlocked here. */ 1584 cmode = ((open_mode &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1585 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, pb); 1586 if (dvp != NULL) 1587 NDAT(&nd, dvp); 1588 1589 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1590 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1591 fd_abort(p, fp, indx); 1592 if ((error == EDUPFD || error == EMOVEFD) && 1593 l->l_dupfd >= 0 && /* XXX from fdopen */ 1594 (error = 1595 fd_dupopen(l->l_dupfd, &indx, flags, error)) == 0) { 1596 *fd = indx; 1597 return 0; 1598 } 1599 if (error == ERESTART) 1600 error = EINTR; 1601 return error; 1602 } 1603 1604 l->l_dupfd = 0; 1605 vp = nd.ni_vp; 1606 1607 if ((error = open_setfp(l, fp, vp, indx, flags))) 1608 return error; 1609 1610 VOP_UNLOCK(vp); 1611 *fd = indx; 1612 fd_affix(p, fp, indx); 1613 return 0; 1614 } 1615 1616 int 1617 fd_open(const char *path, int open_flags, int open_mode, int *fd) 1618 { 1619 struct pathbuf *pb; 1620 int error, oflags; 1621 1622 oflags = FFLAGS(open_flags); 1623 if ((oflags & (FREAD | FWRITE)) == 0) 1624 return EINVAL; 1625 1626 pb = pathbuf_create(path); 1627 if (pb == NULL) 1628 return ENOMEM; 1629 1630 error = do_open(curlwp, NULL, pb, open_flags, open_mode, fd); 1631 pathbuf_destroy(pb); 1632 1633 return error; 1634 } 1635 1636 static int 1637 do_sys_openat(lwp_t *l, int fdat, const char *path, int flags, 1638 int mode, int *fd) 1639 { 1640 file_t *dfp = NULL; 1641 struct vnode *dvp = NULL; 1642 struct pathbuf *pb; 1643 const char *pathstring = NULL; 1644 int error; 1645 1646 if (path == NULL) { 1647 MODULE_HOOK_CALL(vfs_openat_10_hook, (&pb), enosys(), error); 1648 if (error == ENOSYS) 1649 goto no_compat; 1650 if (error) 1651 return error; 1652 } else { 1653 no_compat: 1654 error = pathbuf_copyin(path, &pb); 1655 if (error) 1656 return error; 1657 } 1658 1659 pathstring = pathbuf_stringcopy_get(pb); 1660 1661 /* 1662 * fdat is ignored if: 1663 * 1) if fdat is AT_FDCWD, which means use current directory as base. 1664 * 2) if path is absolute, then fdat is useless. 1665 */ 1666 if (fdat != AT_FDCWD && pathstring[0] != '/') { 1667 /* fd_getvnode() will use the descriptor for us */ 1668 if ((error = fd_getvnode(fdat, &dfp)) != 0) 1669 goto out; 1670 1671 dvp = dfp->f_vnode; 1672 } 1673 1674 error = do_open(l, dvp, pb, flags, mode, fd); 1675 1676 if (dfp != NULL) 1677 fd_putfile(fdat); 1678 out: 1679 pathbuf_stringcopy_put(pb, pathstring); 1680 pathbuf_destroy(pb); 1681 return error; 1682 } 1683 1684 int 1685 sys_open(struct lwp *l, const struct sys_open_args *uap, register_t *retval) 1686 { 1687 /* { 1688 syscallarg(const char *) path; 1689 syscallarg(int) flags; 1690 syscallarg(int) mode; 1691 } */ 1692 int error; 1693 int fd; 1694 1695 error = do_sys_openat(l, AT_FDCWD, SCARG(uap, path), 1696 SCARG(uap, flags), SCARG(uap, mode), &fd); 1697 1698 if (error == 0) 1699 *retval = fd; 1700 1701 return error; 1702 } 1703 1704 int 1705 sys_openat(struct lwp *l, const struct sys_openat_args *uap, register_t *retval) 1706 { 1707 /* { 1708 syscallarg(int) fd; 1709 syscallarg(const char *) path; 1710 syscallarg(int) oflags; 1711 syscallarg(int) mode; 1712 } */ 1713 int error; 1714 int fd; 1715 1716 error = do_sys_openat(l, SCARG(uap, fd), SCARG(uap, path), 1717 SCARG(uap, oflags), SCARG(uap, mode), &fd); 1718 1719 if (error == 0) 1720 *retval = fd; 1721 1722 return error; 1723 } 1724 1725 static void 1726 vfs__fhfree(fhandle_t *fhp) 1727 { 1728 size_t fhsize; 1729 1730 fhsize = FHANDLE_SIZE(fhp); 1731 kmem_free(fhp, fhsize); 1732 } 1733 1734 /* 1735 * vfs_composefh: compose a filehandle. 1736 */ 1737 1738 int 1739 vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) 1740 { 1741 struct mount *mp; 1742 struct fid *fidp; 1743 int error; 1744 size_t needfhsize; 1745 size_t fidsize; 1746 1747 mp = vp->v_mount; 1748 fidp = NULL; 1749 if (*fh_size < FHANDLE_SIZE_MIN) { 1750 fidsize = 0; 1751 } else { 1752 fidsize = *fh_size - offsetof(fhandle_t, fh_fid); 1753 if (fhp != NULL) { 1754 memset(fhp, 0, *fh_size); 1755 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1756 fidp = &fhp->fh_fid; 1757 } 1758 } 1759 error = VFS_VPTOFH(vp, fidp, &fidsize); 1760 needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1761 if (error == 0 && *fh_size < needfhsize) { 1762 error = E2BIG; 1763 } 1764 *fh_size = needfhsize; 1765 return error; 1766 } 1767 1768 int 1769 vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) 1770 { 1771 struct mount *mp; 1772 fhandle_t *fhp; 1773 size_t fhsize; 1774 size_t fidsize; 1775 int error; 1776 1777 mp = vp->v_mount; 1778 fidsize = 0; 1779 error = VFS_VPTOFH(vp, NULL, &fidsize); 1780 KASSERT(error != 0); 1781 if (error != E2BIG) { 1782 goto out; 1783 } 1784 fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1785 fhp = kmem_zalloc(fhsize, KM_SLEEP); 1786 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1787 error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); 1788 if (error == 0) { 1789 KASSERT((FHANDLE_SIZE(fhp) == fhsize && 1790 FHANDLE_FILEID(fhp)->fid_len == fidsize)); 1791 *fhpp = fhp; 1792 } else { 1793 kmem_free(fhp, fhsize); 1794 } 1795 out: 1796 return error; 1797 } 1798 1799 void 1800 vfs_composefh_free(fhandle_t *fhp) 1801 { 1802 1803 vfs__fhfree(fhp); 1804 } 1805 1806 /* 1807 * vfs_fhtovp: lookup a vnode by a filehandle. 1808 */ 1809 1810 int 1811 vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) 1812 { 1813 struct mount *mp; 1814 int error; 1815 1816 *vpp = NULL; 1817 mp = vfs_getvfs(FHANDLE_FSID(fhp)); 1818 if (mp == NULL) { 1819 error = ESTALE; 1820 goto out; 1821 } 1822 if (mp->mnt_op->vfs_fhtovp == NULL) { 1823 error = EOPNOTSUPP; 1824 goto out; 1825 } 1826 error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp); 1827 out: 1828 return error; 1829 } 1830 1831 /* 1832 * vfs_copyinfh_alloc: allocate and copyin a filehandle, given 1833 * the needed size. 1834 */ 1835 1836 int 1837 vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) 1838 { 1839 fhandle_t *fhp; 1840 int error; 1841 1842 if (fhsize > FHANDLE_SIZE_MAX) { 1843 return EINVAL; 1844 } 1845 if (fhsize < FHANDLE_SIZE_MIN) { 1846 return EINVAL; 1847 } 1848 again: 1849 fhp = kmem_alloc(fhsize, KM_SLEEP); 1850 error = copyin(ufhp, fhp, fhsize); 1851 if (error == 0) { 1852 /* XXX this check shouldn't be here */ 1853 if (FHANDLE_SIZE(fhp) == fhsize) { 1854 *fhpp = fhp; 1855 return 0; 1856 } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { 1857 /* 1858 * a kludge for nfsv2 padded handles. 1859 */ 1860 size_t sz; 1861 1862 sz = FHANDLE_SIZE(fhp); 1863 kmem_free(fhp, fhsize); 1864 fhsize = sz; 1865 goto again; 1866 } else { 1867 /* 1868 * userland told us wrong size. 1869 */ 1870 error = EINVAL; 1871 } 1872 } 1873 kmem_free(fhp, fhsize); 1874 return error; 1875 } 1876 1877 void 1878 vfs_copyinfh_free(fhandle_t *fhp) 1879 { 1880 1881 vfs__fhfree(fhp); 1882 } 1883 1884 /* 1885 * Get file handle system call 1886 */ 1887 int 1888 sys___getfh30(struct lwp *l, const struct sys___getfh30_args *uap, register_t *retval) 1889 { 1890 /* { 1891 syscallarg(char *) fname; 1892 syscallarg(fhandle_t *) fhp; 1893 syscallarg(size_t *) fh_size; 1894 } */ 1895 struct vnode *vp; 1896 fhandle_t *fh; 1897 int error; 1898 struct pathbuf *pb; 1899 struct nameidata nd; 1900 size_t sz; 1901 size_t usz; 1902 1903 /* 1904 * Must be super user 1905 */ 1906 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1907 0, NULL, NULL, NULL); 1908 if (error) 1909 return (error); 1910 1911 error = pathbuf_copyin(SCARG(uap, fname), &pb); 1912 if (error) { 1913 return error; 1914 } 1915 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1916 error = namei(&nd); 1917 if (error) { 1918 pathbuf_destroy(pb); 1919 return error; 1920 } 1921 vp = nd.ni_vp; 1922 pathbuf_destroy(pb); 1923 1924 error = vfs_composefh_alloc(vp, &fh); 1925 vput(vp); 1926 if (error != 0) { 1927 return error; 1928 } 1929 error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); 1930 if (error != 0) { 1931 goto out; 1932 } 1933 sz = FHANDLE_SIZE(fh); 1934 error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); 1935 if (error != 0) { 1936 goto out; 1937 } 1938 if (usz >= sz) { 1939 error = copyout(fh, SCARG(uap, fhp), sz); 1940 } else { 1941 error = E2BIG; 1942 } 1943 out: 1944 vfs_composefh_free(fh); 1945 return (error); 1946 } 1947 1948 /* 1949 * Open a file given a file handle. 1950 * 1951 * Check permissions, allocate an open file structure, 1952 * and call the device open routine if any. 1953 */ 1954 1955 int 1956 dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, 1957 register_t *retval) 1958 { 1959 file_t *fp; 1960 struct vnode *vp = NULL; 1961 kauth_cred_t cred = l->l_cred; 1962 file_t *nfp; 1963 int indx, error; 1964 struct vattr va; 1965 fhandle_t *fh; 1966 int flags; 1967 proc_t *p; 1968 1969 p = curproc; 1970 1971 /* 1972 * Must be super user 1973 */ 1974 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1975 0, NULL, NULL, NULL))) 1976 return (error); 1977 1978 if (oflags & O_SEARCH) { 1979 oflags &= ~(int)O_SEARCH; 1980 } 1981 1982 flags = FFLAGS(oflags); 1983 if ((flags & (FREAD | FWRITE)) == 0) 1984 return (EINVAL); 1985 if ((flags & O_CREAT)) 1986 return (EINVAL); 1987 if ((error = fd_allocfile(&nfp, &indx)) != 0) 1988 return (error); 1989 fp = nfp; 1990 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1991 if (error != 0) { 1992 goto bad; 1993 } 1994 error = vfs_fhtovp(fh, &vp); 1995 vfs_copyinfh_free(fh); 1996 if (error != 0) { 1997 goto bad; 1998 } 1999 2000 /* Now do an effective vn_open */ 2001 2002 if (vp->v_type == VSOCK) { 2003 error = EOPNOTSUPP; 2004 goto bad; 2005 } 2006 error = vn_openchk(vp, cred, flags); 2007 if (error != 0) 2008 goto bad; 2009 if (flags & O_TRUNC) { 2010 VOP_UNLOCK(vp); /* XXX */ 2011 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 2012 vattr_null(&va); 2013 va.va_size = 0; 2014 error = VOP_SETATTR(vp, &va, cred); 2015 if (error) 2016 goto bad; 2017 } 2018 if ((error = VOP_OPEN(vp, flags, cred)) != 0) 2019 goto bad; 2020 if (flags & FWRITE) { 2021 mutex_enter(vp->v_interlock); 2022 vp->v_writecount++; 2023 mutex_exit(vp->v_interlock); 2024 } 2025 2026 /* done with modified vn_open, now finish what sys_open does. */ 2027 if ((error = open_setfp(l, fp, vp, indx, flags))) 2028 return error; 2029 2030 VOP_UNLOCK(vp); 2031 *retval = indx; 2032 fd_affix(p, fp, indx); 2033 return (0); 2034 2035 bad: 2036 fd_abort(p, fp, indx); 2037 if (vp != NULL) 2038 vput(vp); 2039 return (error); 2040 } 2041 2042 int 2043 sys___fhopen40(struct lwp *l, const struct sys___fhopen40_args *uap, register_t *retval) 2044 { 2045 /* { 2046 syscallarg(const void *) fhp; 2047 syscallarg(size_t) fh_size; 2048 syscallarg(int) flags; 2049 } */ 2050 2051 return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), 2052 SCARG(uap, flags), retval); 2053 } 2054 2055 int 2056 do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb) 2057 { 2058 int error; 2059 fhandle_t *fh; 2060 struct vnode *vp; 2061 2062 /* 2063 * Must be super user 2064 */ 2065 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2066 0, NULL, NULL, NULL))) 2067 return (error); 2068 2069 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2070 if (error != 0) 2071 return error; 2072 2073 error = vfs_fhtovp(fh, &vp); 2074 vfs_copyinfh_free(fh); 2075 if (error != 0) 2076 return error; 2077 2078 error = vn_stat(vp, sb); 2079 vput(vp); 2080 return error; 2081 } 2082 2083 2084 /* ARGSUSED */ 2085 int 2086 sys___fhstat50(struct lwp *l, const struct sys___fhstat50_args *uap, register_t *retval) 2087 { 2088 /* { 2089 syscallarg(const void *) fhp; 2090 syscallarg(size_t) fh_size; 2091 syscallarg(struct stat *) sb; 2092 } */ 2093 struct stat sb; 2094 int error; 2095 2096 error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb); 2097 if (error) 2098 return error; 2099 return copyout(&sb, SCARG(uap, sb), sizeof(sb)); 2100 } 2101 2102 int 2103 do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb, 2104 int flags) 2105 { 2106 fhandle_t *fh; 2107 struct mount *mp; 2108 struct vnode *vp; 2109 int error; 2110 2111 /* 2112 * Must be super user 2113 */ 2114 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2115 0, NULL, NULL, NULL))) 2116 return error; 2117 2118 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2119 if (error != 0) 2120 return error; 2121 2122 error = vfs_fhtovp(fh, &vp); 2123 vfs_copyinfh_free(fh); 2124 if (error != 0) 2125 return error; 2126 2127 mp = vp->v_mount; 2128 error = dostatvfs(mp, sb, l, flags, 1); 2129 vput(vp); 2130 return error; 2131 } 2132 2133 /* ARGSUSED */ 2134 int 2135 sys___fhstatvfs140(struct lwp *l, const struct sys___fhstatvfs140_args *uap, register_t *retval) 2136 { 2137 /* { 2138 syscallarg(const void *) fhp; 2139 syscallarg(size_t) fh_size; 2140 syscallarg(struct statvfs *) buf; 2141 syscallarg(int) flags; 2142 } */ 2143 struct statvfs *sb = STATVFSBUF_GET(); 2144 int error; 2145 2146 error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb, 2147 SCARG(uap, flags)); 2148 if (error == 0) 2149 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 2150 STATVFSBUF_PUT(sb); 2151 return error; 2152 } 2153 2154 int 2155 do_posix_mknodat(struct lwp *l, int fdat, const char *pathname, mode_t mode, 2156 dev_t dev) 2157 { 2158 2159 /* 2160 * The POSIX mknod(2) call is an alias for mkfifo(2) for S_IFIFO 2161 * in mode and dev=0. 2162 * 2163 * In all the other cases it's implementation defined behavior. 2164 */ 2165 2166 if ((mode & S_IFIFO) && dev == 0) 2167 return do_sys_mkfifoat(l, fdat, pathname, mode); 2168 else 2169 return do_sys_mknodat(l, fdat, pathname, mode, dev, 2170 UIO_USERSPACE); 2171 } 2172 2173 /* 2174 * Create a special file. 2175 */ 2176 /* ARGSUSED */ 2177 int 2178 sys___mknod50(struct lwp *l, const struct sys___mknod50_args *uap, 2179 register_t *retval) 2180 { 2181 /* { 2182 syscallarg(const char *) path; 2183 syscallarg(mode_t) mode; 2184 syscallarg(dev_t) dev; 2185 } */ 2186 return do_posix_mknodat(l, AT_FDCWD, SCARG(uap, path), 2187 SCARG(uap, mode), SCARG(uap, dev)); 2188 } 2189 2190 int 2191 sys_mknodat(struct lwp *l, const struct sys_mknodat_args *uap, 2192 register_t *retval) 2193 { 2194 /* { 2195 syscallarg(int) fd; 2196 syscallarg(const char *) path; 2197 syscallarg(mode_t) mode; 2198 syscallarg(int) pad; 2199 syscallarg(dev_t) dev; 2200 } */ 2201 2202 return do_posix_mknodat(l, SCARG(uap, fd), SCARG(uap, path), 2203 SCARG(uap, mode), SCARG(uap, dev)); 2204 } 2205 2206 int 2207 do_sys_mknod(struct lwp *l, const char *pathname, mode_t mode, dev_t dev, 2208 enum uio_seg seg) 2209 { 2210 return do_sys_mknodat(l, AT_FDCWD, pathname, mode, dev, seg); 2211 } 2212 2213 int 2214 do_sys_mknodat(struct lwp *l, int fdat, const char *pathname, mode_t mode, 2215 dev_t dev, enum uio_seg seg) 2216 { 2217 struct proc *p = l->l_proc; 2218 struct vnode *vp; 2219 struct vattr vattr; 2220 int error, optype; 2221 struct pathbuf *pb; 2222 struct nameidata nd; 2223 const char *pathstring; 2224 2225 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 2226 0, NULL, NULL, NULL)) != 0) 2227 return (error); 2228 2229 optype = VOP_MKNOD_DESCOFFSET; 2230 2231 error = pathbuf_maybe_copyin(pathname, seg, &pb); 2232 if (error) { 2233 return error; 2234 } 2235 pathstring = pathbuf_stringcopy_get(pb); 2236 if (pathstring == NULL) { 2237 pathbuf_destroy(pb); 2238 return ENOMEM; 2239 } 2240 2241 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2242 2243 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2244 goto out; 2245 vp = nd.ni_vp; 2246 2247 if (vp != NULL) 2248 error = EEXIST; 2249 else { 2250 vattr_null(&vattr); 2251 /* We will read cwdi->cwdi_cmask unlocked. */ 2252 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2253 vattr.va_rdev = dev; 2254 2255 switch (mode & S_IFMT) { 2256 case S_IFMT: /* used by badsect to flag bad sectors */ 2257 vattr.va_type = VBAD; 2258 break; 2259 case S_IFCHR: 2260 vattr.va_type = VCHR; 2261 break; 2262 case S_IFBLK: 2263 vattr.va_type = VBLK; 2264 break; 2265 case S_IFWHT: 2266 optype = VOP_WHITEOUT_DESCOFFSET; 2267 break; 2268 case S_IFREG: 2269 #if NVERIEXEC > 0 2270 error = veriexec_openchk(l, nd.ni_vp, pathstring, 2271 O_CREAT); 2272 #endif /* NVERIEXEC > 0 */ 2273 vattr.va_type = VREG; 2274 vattr.va_rdev = VNOVAL; 2275 optype = VOP_CREATE_DESCOFFSET; 2276 break; 2277 default: 2278 error = EINVAL; 2279 break; 2280 } 2281 } 2282 if (error == 0 && optype == VOP_MKNOD_DESCOFFSET 2283 && vattr.va_rdev == VNOVAL) 2284 error = EINVAL; 2285 if (!error) { 2286 switch (optype) { 2287 case VOP_WHITEOUT_DESCOFFSET: 2288 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 2289 if (error) 2290 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2291 vput(nd.ni_dvp); 2292 break; 2293 2294 case VOP_MKNOD_DESCOFFSET: 2295 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 2296 &nd.ni_cnd, &vattr); 2297 if (error == 0) 2298 vrele(nd.ni_vp); 2299 vput(nd.ni_dvp); 2300 break; 2301 2302 case VOP_CREATE_DESCOFFSET: 2303 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, 2304 &nd.ni_cnd, &vattr); 2305 if (error == 0) 2306 vrele(nd.ni_vp); 2307 vput(nd.ni_dvp); 2308 break; 2309 } 2310 } else { 2311 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2312 if (nd.ni_dvp == vp) 2313 vrele(nd.ni_dvp); 2314 else 2315 vput(nd.ni_dvp); 2316 if (vp) 2317 vrele(vp); 2318 } 2319 out: 2320 pathbuf_stringcopy_put(pb, pathstring); 2321 pathbuf_destroy(pb); 2322 return (error); 2323 } 2324 2325 /* 2326 * Create a named pipe. 2327 */ 2328 /* ARGSUSED */ 2329 int 2330 sys_mkfifo(struct lwp *l, const struct sys_mkfifo_args *uap, register_t *retval) 2331 { 2332 /* { 2333 syscallarg(const char *) path; 2334 syscallarg(int) mode; 2335 } */ 2336 return do_sys_mkfifoat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap, mode)); 2337 } 2338 2339 int 2340 sys_mkfifoat(struct lwp *l, const struct sys_mkfifoat_args *uap, 2341 register_t *retval) 2342 { 2343 /* { 2344 syscallarg(int) fd; 2345 syscallarg(const char *) path; 2346 syscallarg(int) mode; 2347 } */ 2348 2349 return do_sys_mkfifoat(l, SCARG(uap, fd), SCARG(uap, path), 2350 SCARG(uap, mode)); 2351 } 2352 2353 static int 2354 do_sys_mkfifoat(struct lwp *l, int fdat, const char *path, mode_t mode) 2355 { 2356 struct proc *p = l->l_proc; 2357 struct vattr vattr; 2358 int error; 2359 struct pathbuf *pb; 2360 struct nameidata nd; 2361 2362 error = pathbuf_copyin(path, &pb); 2363 if (error) { 2364 return error; 2365 } 2366 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2367 2368 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 2369 pathbuf_destroy(pb); 2370 return error; 2371 } 2372 if (nd.ni_vp != NULL) { 2373 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2374 if (nd.ni_dvp == nd.ni_vp) 2375 vrele(nd.ni_dvp); 2376 else 2377 vput(nd.ni_dvp); 2378 vrele(nd.ni_vp); 2379 pathbuf_destroy(pb); 2380 return (EEXIST); 2381 } 2382 vattr_null(&vattr); 2383 vattr.va_type = VFIFO; 2384 /* We will read cwdi->cwdi_cmask unlocked. */ 2385 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2386 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2387 if (error == 0) 2388 vrele(nd.ni_vp); 2389 vput(nd.ni_dvp); 2390 pathbuf_destroy(pb); 2391 return (error); 2392 } 2393 2394 /* 2395 * Make a hard file link. 2396 */ 2397 /* ARGSUSED */ 2398 int 2399 do_sys_linkat(struct lwp *l, int fdpath, const char *path, int fdlink, 2400 const char *link, int follow, register_t *retval) 2401 { 2402 struct vnode *vp; 2403 struct pathbuf *linkpb; 2404 struct nameidata nd; 2405 namei_simple_flags_t ns_flags; 2406 int error; 2407 2408 if (follow & AT_SYMLINK_FOLLOW) 2409 ns_flags = NSM_FOLLOW_TRYEMULROOT; 2410 else 2411 ns_flags = NSM_NOFOLLOW_TRYEMULROOT; 2412 2413 error = fd_nameiat_simple_user(l, fdpath, path, ns_flags, &vp); 2414 if (error != 0) 2415 return (error); 2416 error = pathbuf_copyin(link, &linkpb); 2417 if (error) { 2418 goto out1; 2419 } 2420 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2421 if ((error = fd_nameiat(l, fdlink, &nd)) != 0) 2422 goto out2; 2423 if (nd.ni_vp) { 2424 error = EEXIST; 2425 goto abortop; 2426 } 2427 /* Prevent hard links on directories. */ 2428 if (vp->v_type == VDIR) { 2429 error = EPERM; 2430 goto abortop; 2431 } 2432 /* Prevent cross-mount operation. */ 2433 if (nd.ni_dvp->v_mount != vp->v_mount) { 2434 error = EXDEV; 2435 goto abortop; 2436 } 2437 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 2438 VOP_UNLOCK(nd.ni_dvp); 2439 vrele(nd.ni_dvp); 2440 out2: 2441 pathbuf_destroy(linkpb); 2442 out1: 2443 vrele(vp); 2444 return (error); 2445 abortop: 2446 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2447 if (nd.ni_dvp == nd.ni_vp) 2448 vrele(nd.ni_dvp); 2449 else 2450 vput(nd.ni_dvp); 2451 if (nd.ni_vp != NULL) 2452 vrele(nd.ni_vp); 2453 goto out2; 2454 } 2455 2456 int 2457 sys_link(struct lwp *l, const struct sys_link_args *uap, register_t *retval) 2458 { 2459 /* { 2460 syscallarg(const char *) path; 2461 syscallarg(const char *) link; 2462 } */ 2463 const char *path = SCARG(uap, path); 2464 const char *link = SCARG(uap, link); 2465 2466 return do_sys_linkat(l, AT_FDCWD, path, AT_FDCWD, link, 2467 AT_SYMLINK_FOLLOW, retval); 2468 } 2469 2470 int 2471 sys_linkat(struct lwp *l, const struct sys_linkat_args *uap, 2472 register_t *retval) 2473 { 2474 /* { 2475 syscallarg(int) fd1; 2476 syscallarg(const char *) name1; 2477 syscallarg(int) fd2; 2478 syscallarg(const char *) name2; 2479 syscallarg(int) flags; 2480 } */ 2481 int fd1 = SCARG(uap, fd1); 2482 const char *name1 = SCARG(uap, name1); 2483 int fd2 = SCARG(uap, fd2); 2484 const char *name2 = SCARG(uap, name2); 2485 int follow; 2486 2487 follow = SCARG(uap, flags) & AT_SYMLINK_FOLLOW; 2488 2489 return do_sys_linkat(l, fd1, name1, fd2, name2, follow, retval); 2490 } 2491 2492 2493 int 2494 do_sys_symlink(const char *patharg, const char *link, enum uio_seg seg) 2495 { 2496 return do_sys_symlinkat(NULL, patharg, AT_FDCWD, link, seg); 2497 } 2498 2499 static int 2500 do_sys_symlinkat(struct lwp *l, const char *patharg, int fdat, 2501 const char *link, enum uio_seg seg) 2502 { 2503 struct proc *p = curproc; 2504 struct vattr vattr; 2505 char *path; 2506 int error; 2507 size_t len; 2508 struct pathbuf *linkpb; 2509 struct nameidata nd; 2510 2511 KASSERT(l != NULL || fdat == AT_FDCWD); 2512 2513 path = PNBUF_GET(); 2514 if (seg == UIO_USERSPACE) { 2515 if ((error = copyinstr(patharg, path, MAXPATHLEN, &len)) != 0) 2516 goto out1; 2517 if ((error = pathbuf_copyin(link, &linkpb)) != 0) 2518 goto out1; 2519 } else { 2520 len = strlen(patharg) + 1; 2521 KASSERT(len <= MAXPATHLEN); 2522 memcpy(path, patharg, len); 2523 linkpb = pathbuf_create(link); 2524 if (linkpb == NULL) { 2525 error = ENOMEM; 2526 goto out1; 2527 } 2528 } 2529 ktrkuser("symlink-target", path, len - 1); 2530 2531 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2532 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2533 goto out2; 2534 if (nd.ni_vp) { 2535 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2536 if (nd.ni_dvp == nd.ni_vp) 2537 vrele(nd.ni_dvp); 2538 else 2539 vput(nd.ni_dvp); 2540 vrele(nd.ni_vp); 2541 error = EEXIST; 2542 goto out2; 2543 } 2544 vattr_null(&vattr); 2545 vattr.va_type = VLNK; 2546 /* We will read cwdi->cwdi_cmask unlocked. */ 2547 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 2548 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 2549 if (error == 0) 2550 vrele(nd.ni_vp); 2551 vput(nd.ni_dvp); 2552 out2: 2553 pathbuf_destroy(linkpb); 2554 out1: 2555 PNBUF_PUT(path); 2556 return (error); 2557 } 2558 2559 /* 2560 * Make a symbolic link. 2561 */ 2562 /* ARGSUSED */ 2563 int 2564 sys_symlink(struct lwp *l, const struct sys_symlink_args *uap, register_t *retval) 2565 { 2566 /* { 2567 syscallarg(const char *) path; 2568 syscallarg(const char *) link; 2569 } */ 2570 2571 return do_sys_symlinkat(l, SCARG(uap, path), AT_FDCWD, SCARG(uap, link), 2572 UIO_USERSPACE); 2573 } 2574 2575 int 2576 sys_symlinkat(struct lwp *l, const struct sys_symlinkat_args *uap, 2577 register_t *retval) 2578 { 2579 /* { 2580 syscallarg(const char *) path1; 2581 syscallarg(int) fd; 2582 syscallarg(const char *) path2; 2583 } */ 2584 2585 return do_sys_symlinkat(l, SCARG(uap, path1), SCARG(uap, fd), 2586 SCARG(uap, path2), UIO_USERSPACE); 2587 } 2588 2589 /* 2590 * Delete a whiteout from the filesystem. 2591 */ 2592 /* ARGSUSED */ 2593 int 2594 sys_undelete(struct lwp *l, const struct sys_undelete_args *uap, register_t *retval) 2595 { 2596 /* { 2597 syscallarg(const char *) path; 2598 } */ 2599 int error; 2600 struct pathbuf *pb; 2601 struct nameidata nd; 2602 2603 error = pathbuf_copyin(SCARG(uap, path), &pb); 2604 if (error) { 2605 return error; 2606 } 2607 2608 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT, pb); 2609 error = namei(&nd); 2610 if (error) { 2611 pathbuf_destroy(pb); 2612 return (error); 2613 } 2614 2615 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 2616 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2617 if (nd.ni_dvp == nd.ni_vp) 2618 vrele(nd.ni_dvp); 2619 else 2620 vput(nd.ni_dvp); 2621 if (nd.ni_vp) 2622 vrele(nd.ni_vp); 2623 pathbuf_destroy(pb); 2624 return (EEXIST); 2625 } 2626 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 2627 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2628 vput(nd.ni_dvp); 2629 pathbuf_destroy(pb); 2630 return (error); 2631 } 2632 2633 /* 2634 * Delete a name from the filesystem. 2635 */ 2636 /* ARGSUSED */ 2637 int 2638 sys_unlink(struct lwp *l, const struct sys_unlink_args *uap, register_t *retval) 2639 { 2640 /* { 2641 syscallarg(const char *) path; 2642 } */ 2643 2644 return do_sys_unlinkat(l, AT_FDCWD, SCARG(uap, path), 0, UIO_USERSPACE); 2645 } 2646 2647 int 2648 sys_unlinkat(struct lwp *l, const struct sys_unlinkat_args *uap, 2649 register_t *retval) 2650 { 2651 /* { 2652 syscallarg(int) fd; 2653 syscallarg(const char *) path; 2654 syscallarg(int) flag; 2655 } */ 2656 2657 return do_sys_unlinkat(l, SCARG(uap, fd), SCARG(uap, path), 2658 SCARG(uap, flag), UIO_USERSPACE); 2659 } 2660 2661 int 2662 do_sys_unlink(const char *arg, enum uio_seg seg) 2663 { 2664 return do_sys_unlinkat(NULL, AT_FDCWD, arg, 0, seg); 2665 } 2666 2667 static int 2668 do_sys_unlinkat(struct lwp *l, int fdat, const char *arg, int flags, 2669 enum uio_seg seg) 2670 { 2671 struct vnode *vp; 2672 int error; 2673 struct pathbuf *pb; 2674 struct nameidata nd; 2675 const char *pathstring; 2676 2677 KASSERT(l != NULL || fdat == AT_FDCWD); 2678 2679 error = pathbuf_maybe_copyin(arg, seg, &pb); 2680 if (error) { 2681 return error; 2682 } 2683 pathstring = pathbuf_stringcopy_get(pb); 2684 if (pathstring == NULL) { 2685 pathbuf_destroy(pb); 2686 return ENOMEM; 2687 } 2688 2689 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, pb); 2690 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2691 goto out; 2692 vp = nd.ni_vp; 2693 2694 /* 2695 * The root of a mounted filesystem cannot be deleted. 2696 */ 2697 if ((vp->v_vflag & VV_ROOT) != 0) { 2698 error = EBUSY; 2699 goto abort; 2700 } 2701 2702 if ((vp->v_type == VDIR) && (vp->v_mountedhere != NULL)) { 2703 error = EBUSY; 2704 goto abort; 2705 } 2706 2707 /* 2708 * No rmdir "." please. 2709 */ 2710 if (nd.ni_dvp == vp) { 2711 error = EINVAL; 2712 goto abort; 2713 } 2714 2715 /* 2716 * AT_REMOVEDIR is required to remove a directory 2717 */ 2718 if (vp->v_type == VDIR) { 2719 if (!(flags & AT_REMOVEDIR)) { 2720 error = EPERM; 2721 goto abort; 2722 } else { 2723 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2724 vput(nd.ni_dvp); 2725 goto out; 2726 } 2727 } 2728 2729 /* 2730 * Starting here we only deal with non directories. 2731 */ 2732 if (flags & AT_REMOVEDIR) { 2733 error = ENOTDIR; 2734 goto abort; 2735 } 2736 2737 #if NVERIEXEC > 0 2738 /* Handle remove requests for veriexec entries. */ 2739 if ((error = veriexec_removechk(curlwp, nd.ni_vp, pathstring)) != 0) { 2740 goto abort; 2741 } 2742 #endif /* NVERIEXEC > 0 */ 2743 2744 #ifdef FILEASSOC 2745 (void)fileassoc_file_delete(vp); 2746 #endif /* FILEASSOC */ 2747 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2748 vput(nd.ni_dvp); 2749 goto out; 2750 2751 abort: 2752 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2753 if (nd.ni_dvp == vp) 2754 vrele(nd.ni_dvp); 2755 else 2756 vput(nd.ni_dvp); 2757 vput(vp); 2758 2759 out: 2760 pathbuf_stringcopy_put(pb, pathstring); 2761 pathbuf_destroy(pb); 2762 return (error); 2763 } 2764 2765 /* 2766 * Reposition read/write file offset. 2767 */ 2768 int 2769 sys_lseek(struct lwp *l, const struct sys_lseek_args *uap, register_t *retval) 2770 { 2771 /* { 2772 syscallarg(int) fd; 2773 syscallarg(int) pad; 2774 syscallarg(off_t) offset; 2775 syscallarg(int) whence; 2776 } */ 2777 kauth_cred_t cred = l->l_cred; 2778 file_t *fp; 2779 struct vnode *vp; 2780 struct vattr vattr; 2781 off_t newoff; 2782 int error, fd; 2783 2784 fd = SCARG(uap, fd); 2785 2786 if ((fp = fd_getfile(fd)) == NULL) 2787 return (EBADF); 2788 2789 vp = fp->f_vnode; 2790 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2791 error = ESPIPE; 2792 goto out; 2793 } 2794 2795 vn_lock(vp, LK_SHARED | LK_RETRY); 2796 2797 switch (SCARG(uap, whence)) { 2798 case SEEK_CUR: 2799 newoff = fp->f_offset + SCARG(uap, offset); 2800 break; 2801 case SEEK_END: 2802 error = VOP_GETATTR(vp, &vattr, cred); 2803 if (error) { 2804 VOP_UNLOCK(vp); 2805 goto out; 2806 } 2807 newoff = SCARG(uap, offset) + vattr.va_size; 2808 break; 2809 case SEEK_SET: 2810 newoff = SCARG(uap, offset); 2811 break; 2812 default: 2813 error = EINVAL; 2814 VOP_UNLOCK(vp); 2815 goto out; 2816 } 2817 VOP_UNLOCK(vp); 2818 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) == 0) { 2819 *(off_t *)retval = fp->f_offset = newoff; 2820 } 2821 out: 2822 fd_putfile(fd); 2823 return (error); 2824 } 2825 2826 /* 2827 * Positional read system call. 2828 */ 2829 int 2830 sys_pread(struct lwp *l, const struct sys_pread_args *uap, register_t *retval) 2831 { 2832 /* { 2833 syscallarg(int) fd; 2834 syscallarg(void *) buf; 2835 syscallarg(size_t) nbyte; 2836 syscallarg(off_t) offset; 2837 } */ 2838 file_t *fp; 2839 struct vnode *vp; 2840 off_t offset; 2841 int error, fd = SCARG(uap, fd); 2842 2843 if ((fp = fd_getfile(fd)) == NULL) 2844 return (EBADF); 2845 2846 if ((fp->f_flag & FREAD) == 0) { 2847 fd_putfile(fd); 2848 return (EBADF); 2849 } 2850 2851 vp = fp->f_vnode; 2852 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2853 error = ESPIPE; 2854 goto out; 2855 } 2856 2857 offset = SCARG(uap, offset); 2858 2859 /* 2860 * XXX This works because no file systems actually 2861 * XXX take any action on the seek operation. 2862 */ 2863 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2864 goto out; 2865 2866 /* dofileread() will unuse the descriptor for us */ 2867 return (dofileread(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2868 &offset, 0, retval)); 2869 2870 out: 2871 fd_putfile(fd); 2872 return (error); 2873 } 2874 2875 /* 2876 * Positional scatter read system call. 2877 */ 2878 int 2879 sys_preadv(struct lwp *l, const struct sys_preadv_args *uap, register_t *retval) 2880 { 2881 /* { 2882 syscallarg(int) fd; 2883 syscallarg(const struct iovec *) iovp; 2884 syscallarg(int) iovcnt; 2885 syscallarg(off_t) offset; 2886 } */ 2887 off_t offset = SCARG(uap, offset); 2888 2889 return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp), 2890 SCARG(uap, iovcnt), &offset, 0, retval); 2891 } 2892 2893 /* 2894 * Positional write system call. 2895 */ 2896 int 2897 sys_pwrite(struct lwp *l, const struct sys_pwrite_args *uap, register_t *retval) 2898 { 2899 /* { 2900 syscallarg(int) fd; 2901 syscallarg(const void *) buf; 2902 syscallarg(size_t) nbyte; 2903 syscallarg(off_t) offset; 2904 } */ 2905 file_t *fp; 2906 struct vnode *vp; 2907 off_t offset; 2908 int error, fd = SCARG(uap, fd); 2909 2910 if ((fp = fd_getfile(fd)) == NULL) 2911 return (EBADF); 2912 2913 if ((fp->f_flag & FWRITE) == 0) { 2914 fd_putfile(fd); 2915 return (EBADF); 2916 } 2917 2918 vp = fp->f_vnode; 2919 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2920 error = ESPIPE; 2921 goto out; 2922 } 2923 2924 offset = SCARG(uap, offset); 2925 2926 /* 2927 * XXX This works because no file systems actually 2928 * XXX take any action on the seek operation. 2929 */ 2930 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2931 goto out; 2932 2933 /* dofilewrite() will unuse the descriptor for us */ 2934 return (dofilewrite(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2935 &offset, 0, retval)); 2936 2937 out: 2938 fd_putfile(fd); 2939 return (error); 2940 } 2941 2942 /* 2943 * Positional gather write system call. 2944 */ 2945 int 2946 sys_pwritev(struct lwp *l, const struct sys_pwritev_args *uap, register_t *retval) 2947 { 2948 /* { 2949 syscallarg(int) fd; 2950 syscallarg(const struct iovec *) iovp; 2951 syscallarg(int) iovcnt; 2952 syscallarg(off_t) offset; 2953 } */ 2954 off_t offset = SCARG(uap, offset); 2955 2956 return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp), 2957 SCARG(uap, iovcnt), &offset, 0, retval); 2958 } 2959 2960 /* 2961 * Check access permissions. 2962 */ 2963 int 2964 sys_access(struct lwp *l, const struct sys_access_args *uap, register_t *retval) 2965 { 2966 /* { 2967 syscallarg(const char *) path; 2968 syscallarg(int) flags; 2969 } */ 2970 2971 return do_sys_accessat(l, AT_FDCWD, SCARG(uap, path), 2972 SCARG(uap, flags), 0); 2973 } 2974 2975 int 2976 do_sys_accessat(struct lwp *l, int fdat, const char *path, 2977 int mode, int flags) 2978 { 2979 kauth_cred_t cred; 2980 struct vnode *vp; 2981 int error, nd_flag, vmode; 2982 struct pathbuf *pb; 2983 struct nameidata nd; 2984 2985 CTASSERT(F_OK == 0); 2986 if ((mode & ~(R_OK | W_OK | X_OK)) != 0) { 2987 /* nonsense mode */ 2988 return EINVAL; 2989 } 2990 2991 nd_flag = FOLLOW | LOCKLEAF | TRYEMULROOT; 2992 if (flags & AT_SYMLINK_NOFOLLOW) 2993 nd_flag &= ~FOLLOW; 2994 2995 error = pathbuf_copyin(path, &pb); 2996 if (error) 2997 return error; 2998 2999 NDINIT(&nd, LOOKUP, nd_flag, pb); 3000 3001 /* Override default credentials */ 3002 cred = kauth_cred_dup(l->l_cred); 3003 if (!(flags & AT_EACCESS)) { 3004 kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); 3005 kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); 3006 } 3007 nd.ni_cnd.cn_cred = cred; 3008 3009 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 3010 pathbuf_destroy(pb); 3011 goto out; 3012 } 3013 vp = nd.ni_vp; 3014 pathbuf_destroy(pb); 3015 3016 /* Flags == 0 means only check for existence. */ 3017 if (mode) { 3018 vmode = 0; 3019 if (mode & R_OK) 3020 vmode |= VREAD; 3021 if (mode & W_OK) 3022 vmode |= VWRITE; 3023 if (mode & X_OK) 3024 vmode |= VEXEC; 3025 3026 error = VOP_ACCESS(vp, vmode, cred); 3027 if (!error && (vmode & VWRITE)) 3028 error = vn_writechk(vp); 3029 } 3030 vput(vp); 3031 out: 3032 kauth_cred_free(cred); 3033 return (error); 3034 } 3035 3036 int 3037 sys_faccessat(struct lwp *l, const struct sys_faccessat_args *uap, 3038 register_t *retval) 3039 { 3040 /* { 3041 syscallarg(int) fd; 3042 syscallarg(const char *) path; 3043 syscallarg(int) amode; 3044 syscallarg(int) flag; 3045 } */ 3046 3047 return do_sys_accessat(l, SCARG(uap, fd), SCARG(uap, path), 3048 SCARG(uap, amode), SCARG(uap, flag)); 3049 } 3050 3051 /* 3052 * Common code for all sys_stat functions, including compat versions. 3053 */ 3054 int 3055 do_sys_stat(const char *userpath, unsigned int nd_flag, 3056 struct stat *sb) 3057 { 3058 return do_sys_statat(NULL, AT_FDCWD, userpath, nd_flag, sb); 3059 } 3060 3061 int 3062 do_sys_statat(struct lwp *l, int fdat, const char *userpath, 3063 unsigned int nd_flag, struct stat *sb) 3064 { 3065 int error; 3066 struct pathbuf *pb; 3067 struct nameidata nd; 3068 3069 KASSERT(l != NULL || fdat == AT_FDCWD); 3070 3071 error = pathbuf_copyin(userpath, &pb); 3072 if (error) { 3073 return error; 3074 } 3075 3076 NDINIT(&nd, LOOKUP, nd_flag | LOCKLEAF | TRYEMULROOT, pb); 3077 3078 error = fd_nameiat(l, fdat, &nd); 3079 if (error != 0) { 3080 pathbuf_destroy(pb); 3081 return error; 3082 } 3083 error = vn_stat(nd.ni_vp, sb); 3084 vput(nd.ni_vp); 3085 pathbuf_destroy(pb); 3086 return error; 3087 } 3088 3089 /* 3090 * Get file status; this version follows links. 3091 */ 3092 /* ARGSUSED */ 3093 int 3094 sys___stat50(struct lwp *l, const struct sys___stat50_args *uap, register_t *retval) 3095 { 3096 /* { 3097 syscallarg(const char *) path; 3098 syscallarg(struct stat *) ub; 3099 } */ 3100 struct stat sb; 3101 int error; 3102 3103 error = do_sys_statat(l, AT_FDCWD, SCARG(uap, path), FOLLOW, &sb); 3104 if (error) 3105 return error; 3106 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 3107 } 3108 3109 /* 3110 * Get file status; this version does not follow links. 3111 */ 3112 /* ARGSUSED */ 3113 int 3114 sys___lstat50(struct lwp *l, const struct sys___lstat50_args *uap, register_t *retval) 3115 { 3116 /* { 3117 syscallarg(const char *) path; 3118 syscallarg(struct stat *) ub; 3119 } */ 3120 struct stat sb; 3121 int error; 3122 3123 error = do_sys_statat(l, AT_FDCWD, SCARG(uap, path), NOFOLLOW, &sb); 3124 if (error) 3125 return error; 3126 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 3127 } 3128 3129 int 3130 sys_fstatat(struct lwp *l, const struct sys_fstatat_args *uap, 3131 register_t *retval) 3132 { 3133 /* { 3134 syscallarg(int) fd; 3135 syscallarg(const char *) path; 3136 syscallarg(struct stat *) buf; 3137 syscallarg(int) flag; 3138 } */ 3139 unsigned int nd_flag; 3140 struct stat sb; 3141 int error; 3142 3143 if (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) 3144 nd_flag = NOFOLLOW; 3145 else 3146 nd_flag = FOLLOW; 3147 3148 error = do_sys_statat(l, SCARG(uap, fd), SCARG(uap, path), nd_flag, 3149 &sb); 3150 if (error) 3151 return error; 3152 return copyout(&sb, SCARG(uap, buf), sizeof(sb)); 3153 } 3154 3155 /* 3156 * Get configurable pathname variables. 3157 */ 3158 /* ARGSUSED */ 3159 int 3160 sys_pathconf(struct lwp *l, const struct sys_pathconf_args *uap, register_t *retval) 3161 { 3162 /* { 3163 syscallarg(const char *) path; 3164 syscallarg(int) name; 3165 } */ 3166 int error; 3167 struct pathbuf *pb; 3168 struct nameidata nd; 3169 3170 error = pathbuf_copyin(SCARG(uap, path), &pb); 3171 if (error) { 3172 return error; 3173 } 3174 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 3175 if ((error = namei(&nd)) != 0) { 3176 pathbuf_destroy(pb); 3177 return (error); 3178 } 3179 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 3180 vput(nd.ni_vp); 3181 pathbuf_destroy(pb); 3182 return (error); 3183 } 3184 3185 /* 3186 * Return target name of a symbolic link. 3187 */ 3188 /* ARGSUSED */ 3189 int 3190 sys_readlink(struct lwp *l, const struct sys_readlink_args *uap, 3191 register_t *retval) 3192 { 3193 /* { 3194 syscallarg(const char *) path; 3195 syscallarg(char *) buf; 3196 syscallarg(size_t) count; 3197 } */ 3198 return do_sys_readlinkat(l, AT_FDCWD, SCARG(uap, path), 3199 SCARG(uap, buf), SCARG(uap, count), retval); 3200 } 3201 3202 static int 3203 do_sys_readlinkat(struct lwp *l, int fdat, const char *path, char *buf, 3204 size_t count, register_t *retval) 3205 { 3206 struct vnode *vp; 3207 struct iovec aiov; 3208 struct uio auio; 3209 int error; 3210 struct pathbuf *pb; 3211 struct nameidata nd; 3212 3213 error = pathbuf_copyin(path, &pb); 3214 if (error) { 3215 return error; 3216 } 3217 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, pb); 3218 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 3219 pathbuf_destroy(pb); 3220 return error; 3221 } 3222 vp = nd.ni_vp; 3223 pathbuf_destroy(pb); 3224 if (vp->v_type != VLNK) 3225 error = EINVAL; 3226 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 3227 (error = VOP_ACCESS(vp, VREAD, l->l_cred)) == 0) { 3228 aiov.iov_base = buf; 3229 aiov.iov_len = count; 3230 auio.uio_iov = &aiov; 3231 auio.uio_iovcnt = 1; 3232 auio.uio_offset = 0; 3233 auio.uio_rw = UIO_READ; 3234 KASSERT(l == curlwp); 3235 auio.uio_vmspace = l->l_proc->p_vmspace; 3236 auio.uio_resid = count; 3237 if ((error = VOP_READLINK(vp, &auio, l->l_cred)) == 0) 3238 *retval = count - auio.uio_resid; 3239 } 3240 vput(vp); 3241 return (error); 3242 } 3243 3244 int 3245 sys_readlinkat(struct lwp *l, const struct sys_readlinkat_args *uap, 3246 register_t *retval) 3247 { 3248 /* { 3249 syscallarg(int) fd; 3250 syscallarg(const char *) path; 3251 syscallarg(char *) buf; 3252 syscallarg(size_t) bufsize; 3253 } */ 3254 3255 return do_sys_readlinkat(l, SCARG(uap, fd), SCARG(uap, path), 3256 SCARG(uap, buf), SCARG(uap, bufsize), retval); 3257 } 3258 3259 /* 3260 * Change flags of a file given a path name. 3261 */ 3262 /* ARGSUSED */ 3263 int 3264 sys_chflags(struct lwp *l, const struct sys_chflags_args *uap, register_t *retval) 3265 { 3266 /* { 3267 syscallarg(const char *) path; 3268 syscallarg(u_long) flags; 3269 } */ 3270 struct vnode *vp; 3271 int error; 3272 3273 error = namei_simple_user(SCARG(uap, path), 3274 NSM_FOLLOW_TRYEMULROOT, &vp); 3275 if (error != 0) 3276 return (error); 3277 error = change_flags(vp, SCARG(uap, flags), l); 3278 vput(vp); 3279 return (error); 3280 } 3281 3282 /* 3283 * Change flags of a file given a file descriptor. 3284 */ 3285 /* ARGSUSED */ 3286 int 3287 sys_fchflags(struct lwp *l, const struct sys_fchflags_args *uap, register_t *retval) 3288 { 3289 /* { 3290 syscallarg(int) fd; 3291 syscallarg(u_long) flags; 3292 } */ 3293 struct vnode *vp; 3294 file_t *fp; 3295 int error; 3296 3297 /* fd_getvnode() will use the descriptor for us */ 3298 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3299 return (error); 3300 vp = fp->f_vnode; 3301 error = change_flags(vp, SCARG(uap, flags), l); 3302 VOP_UNLOCK(vp); 3303 fd_putfile(SCARG(uap, fd)); 3304 return (error); 3305 } 3306 3307 /* 3308 * Change flags of a file given a path name; this version does 3309 * not follow links. 3310 */ 3311 int 3312 sys_lchflags(struct lwp *l, const struct sys_lchflags_args *uap, register_t *retval) 3313 { 3314 /* { 3315 syscallarg(const char *) path; 3316 syscallarg(u_long) flags; 3317 } */ 3318 struct vnode *vp; 3319 int error; 3320 3321 error = namei_simple_user(SCARG(uap, path), 3322 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3323 if (error != 0) 3324 return (error); 3325 error = change_flags(vp, SCARG(uap, flags), l); 3326 vput(vp); 3327 return (error); 3328 } 3329 3330 /* 3331 * Common routine to change flags of a file. 3332 */ 3333 int 3334 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 3335 { 3336 struct vattr vattr; 3337 int error; 3338 3339 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3340 3341 vattr_null(&vattr); 3342 vattr.va_flags = flags; 3343 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3344 3345 return (error); 3346 } 3347 3348 /* 3349 * Change mode of a file given path name; this version follows links. 3350 */ 3351 /* ARGSUSED */ 3352 int 3353 sys_chmod(struct lwp *l, const struct sys_chmod_args *uap, register_t *retval) 3354 { 3355 /* { 3356 syscallarg(const char *) path; 3357 syscallarg(int) mode; 3358 } */ 3359 return do_sys_chmodat(l, AT_FDCWD, SCARG(uap, path), 3360 SCARG(uap, mode), 0); 3361 } 3362 3363 int 3364 do_sys_chmodat(struct lwp *l, int fdat, const char *path, int mode, int flags) 3365 { 3366 int error; 3367 struct vnode *vp; 3368 namei_simple_flags_t ns_flag; 3369 3370 if (flags & AT_SYMLINK_NOFOLLOW) 3371 ns_flag = NSM_NOFOLLOW_TRYEMULROOT; 3372 else 3373 ns_flag = NSM_FOLLOW_TRYEMULROOT; 3374 3375 error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp); 3376 if (error != 0) 3377 return error; 3378 3379 error = change_mode(vp, mode, l); 3380 3381 vrele(vp); 3382 3383 return (error); 3384 } 3385 3386 /* 3387 * Change mode of a file given a file descriptor. 3388 */ 3389 /* ARGSUSED */ 3390 int 3391 sys_fchmod(struct lwp *l, const struct sys_fchmod_args *uap, register_t *retval) 3392 { 3393 /* { 3394 syscallarg(int) fd; 3395 syscallarg(int) mode; 3396 } */ 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 error = change_mode(fp->f_vnode, SCARG(uap, mode), l); 3404 fd_putfile(SCARG(uap, fd)); 3405 return (error); 3406 } 3407 3408 int 3409 sys_fchmodat(struct lwp *l, const struct sys_fchmodat_args *uap, 3410 register_t *retval) 3411 { 3412 /* { 3413 syscallarg(int) fd; 3414 syscallarg(const char *) path; 3415 syscallarg(int) mode; 3416 syscallarg(int) flag; 3417 } */ 3418 3419 return do_sys_chmodat(l, SCARG(uap, fd), SCARG(uap, path), 3420 SCARG(uap, mode), SCARG(uap, flag)); 3421 } 3422 3423 /* 3424 * Change mode of a file given path name; this version does not follow links. 3425 */ 3426 /* ARGSUSED */ 3427 int 3428 sys_lchmod(struct lwp *l, const struct sys_lchmod_args *uap, register_t *retval) 3429 { 3430 /* { 3431 syscallarg(const char *) path; 3432 syscallarg(int) mode; 3433 } */ 3434 int error; 3435 struct vnode *vp; 3436 3437 error = namei_simple_user(SCARG(uap, path), 3438 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3439 if (error != 0) 3440 return (error); 3441 3442 error = change_mode(vp, SCARG(uap, mode), l); 3443 3444 vrele(vp); 3445 return (error); 3446 } 3447 3448 /* 3449 * Common routine to set mode given a vnode. 3450 */ 3451 static int 3452 change_mode(struct vnode *vp, int mode, struct lwp *l) 3453 { 3454 struct vattr vattr; 3455 int error; 3456 3457 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3458 vattr_null(&vattr); 3459 vattr.va_mode = mode & ALLPERMS; 3460 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3461 VOP_UNLOCK(vp); 3462 return (error); 3463 } 3464 3465 /* 3466 * Set ownership given a path name; this version follows links. 3467 */ 3468 /* ARGSUSED */ 3469 int 3470 sys_chown(struct lwp *l, const struct sys_chown_args *uap, register_t *retval) 3471 { 3472 /* { 3473 syscallarg(const char *) path; 3474 syscallarg(uid_t) uid; 3475 syscallarg(gid_t) gid; 3476 } */ 3477 return do_sys_chownat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap,uid), 3478 SCARG(uap, gid), 0); 3479 } 3480 3481 int 3482 do_sys_chownat(struct lwp *l, int fdat, const char *path, uid_t uid, 3483 gid_t gid, int flags) 3484 { 3485 int error; 3486 struct vnode *vp; 3487 namei_simple_flags_t ns_flag; 3488 3489 if (flags & AT_SYMLINK_NOFOLLOW) 3490 ns_flag = NSM_NOFOLLOW_TRYEMULROOT; 3491 else 3492 ns_flag = NSM_FOLLOW_TRYEMULROOT; 3493 3494 error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp); 3495 if (error != 0) 3496 return error; 3497 3498 error = change_owner(vp, uid, gid, l, 0); 3499 3500 vrele(vp); 3501 3502 return (error); 3503 } 3504 3505 /* 3506 * Set ownership given a path name; this version follows links. 3507 * Provides POSIX semantics. 3508 */ 3509 /* ARGSUSED */ 3510 int 3511 sys___posix_chown(struct lwp *l, const struct sys___posix_chown_args *uap, register_t *retval) 3512 { 3513 /* { 3514 syscallarg(const char *) path; 3515 syscallarg(uid_t) uid; 3516 syscallarg(gid_t) gid; 3517 } */ 3518 int error; 3519 struct vnode *vp; 3520 3521 error = namei_simple_user(SCARG(uap, path), 3522 NSM_FOLLOW_TRYEMULROOT, &vp); 3523 if (error != 0) 3524 return (error); 3525 3526 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3527 3528 vrele(vp); 3529 return (error); 3530 } 3531 3532 /* 3533 * Set ownership given a file descriptor. 3534 */ 3535 /* ARGSUSED */ 3536 int 3537 sys_fchown(struct lwp *l, const struct sys_fchown_args *uap, register_t *retval) 3538 { 3539 /* { 3540 syscallarg(int) fd; 3541 syscallarg(uid_t) uid; 3542 syscallarg(gid_t) gid; 3543 } */ 3544 int error; 3545 file_t *fp; 3546 3547 /* fd_getvnode() will use the descriptor for us */ 3548 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3549 return (error); 3550 error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid), 3551 l, 0); 3552 fd_putfile(SCARG(uap, fd)); 3553 return (error); 3554 } 3555 3556 int 3557 sys_fchownat(struct lwp *l, const struct sys_fchownat_args *uap, 3558 register_t *retval) 3559 { 3560 /* { 3561 syscallarg(int) fd; 3562 syscallarg(const char *) path; 3563 syscallarg(uid_t) owner; 3564 syscallarg(gid_t) group; 3565 syscallarg(int) flag; 3566 } */ 3567 3568 return do_sys_chownat(l, SCARG(uap, fd), SCARG(uap, path), 3569 SCARG(uap, owner), SCARG(uap, group), 3570 SCARG(uap, flag)); 3571 } 3572 3573 /* 3574 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 3575 */ 3576 /* ARGSUSED */ 3577 int 3578 sys___posix_fchown(struct lwp *l, const struct sys___posix_fchown_args *uap, register_t *retval) 3579 { 3580 /* { 3581 syscallarg(int) fd; 3582 syscallarg(uid_t) uid; 3583 syscallarg(gid_t) gid; 3584 } */ 3585 int error; 3586 file_t *fp; 3587 3588 /* fd_getvnode() will use the descriptor for us */ 3589 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3590 return (error); 3591 error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid), 3592 l, 1); 3593 fd_putfile(SCARG(uap, fd)); 3594 return (error); 3595 } 3596 3597 /* 3598 * Set ownership given a path name; this version does not follow links. 3599 */ 3600 /* ARGSUSED */ 3601 int 3602 sys_lchown(struct lwp *l, const struct sys_lchown_args *uap, register_t *retval) 3603 { 3604 /* { 3605 syscallarg(const char *) path; 3606 syscallarg(uid_t) uid; 3607 syscallarg(gid_t) gid; 3608 } */ 3609 int error; 3610 struct vnode *vp; 3611 3612 error = namei_simple_user(SCARG(uap, path), 3613 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3614 if (error != 0) 3615 return (error); 3616 3617 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 3618 3619 vrele(vp); 3620 return (error); 3621 } 3622 3623 /* 3624 * Set ownership given a path name; this version does not follow links. 3625 * Provides POSIX/XPG semantics. 3626 */ 3627 /* ARGSUSED */ 3628 int 3629 sys___posix_lchown(struct lwp *l, const struct sys___posix_lchown_args *uap, register_t *retval) 3630 { 3631 /* { 3632 syscallarg(const char *) path; 3633 syscallarg(uid_t) uid; 3634 syscallarg(gid_t) gid; 3635 } */ 3636 int error; 3637 struct vnode *vp; 3638 3639 error = namei_simple_user(SCARG(uap, path), 3640 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3641 if (error != 0) 3642 return (error); 3643 3644 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3645 3646 vrele(vp); 3647 return (error); 3648 } 3649 3650 /* 3651 * Common routine to set ownership given a vnode. 3652 */ 3653 static int 3654 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 3655 int posix_semantics) 3656 { 3657 struct vattr vattr; 3658 mode_t newmode; 3659 int error; 3660 3661 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3662 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) 3663 goto out; 3664 3665 #define CHANGED(x) ((int)(x) != -1) 3666 newmode = vattr.va_mode; 3667 if (posix_semantics) { 3668 /* 3669 * POSIX/XPG semantics: if the caller is not the super-user, 3670 * clear set-user-id and set-group-id bits. Both POSIX and 3671 * the XPG consider the behaviour for calls by the super-user 3672 * implementation-defined; we leave the set-user-id and set- 3673 * group-id settings intact in that case. 3674 */ 3675 if (vattr.va_mode & S_ISUID) { 3676 if (kauth_authorize_vnode(l->l_cred, 3677 KAUTH_VNODE_RETAIN_SUID, vp, NULL, EPERM) != 0) 3678 newmode &= ~S_ISUID; 3679 } 3680 if (vattr.va_mode & S_ISGID) { 3681 if (kauth_authorize_vnode(l->l_cred, 3682 KAUTH_VNODE_RETAIN_SGID, vp, NULL, EPERM) != 0) 3683 newmode &= ~S_ISGID; 3684 } 3685 } else { 3686 /* 3687 * NetBSD semantics: when changing owner and/or group, 3688 * clear the respective bit(s). 3689 */ 3690 if (CHANGED(uid)) 3691 newmode &= ~S_ISUID; 3692 if (CHANGED(gid)) 3693 newmode &= ~S_ISGID; 3694 } 3695 /* Update va_mode iff altered. */ 3696 if (vattr.va_mode == newmode) 3697 newmode = VNOVAL; 3698 3699 vattr_null(&vattr); 3700 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 3701 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 3702 vattr.va_mode = newmode; 3703 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3704 #undef CHANGED 3705 3706 out: 3707 VOP_UNLOCK(vp); 3708 return (error); 3709 } 3710 3711 /* 3712 * Set the access and modification times given a path name; this 3713 * version follows links. 3714 */ 3715 /* ARGSUSED */ 3716 int 3717 sys___utimes50(struct lwp *l, const struct sys___utimes50_args *uap, 3718 register_t *retval) 3719 { 3720 /* { 3721 syscallarg(const char *) path; 3722 syscallarg(const struct timeval *) tptr; 3723 } */ 3724 3725 return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, 3726 SCARG(uap, tptr), UIO_USERSPACE); 3727 } 3728 3729 /* 3730 * Set the access and modification times given a file descriptor. 3731 */ 3732 /* ARGSUSED */ 3733 int 3734 sys___futimes50(struct lwp *l, const struct sys___futimes50_args *uap, 3735 register_t *retval) 3736 { 3737 /* { 3738 syscallarg(int) fd; 3739 syscallarg(const struct timeval *) tptr; 3740 } */ 3741 int error; 3742 file_t *fp; 3743 3744 /* fd_getvnode() will use the descriptor for us */ 3745 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3746 return (error); 3747 error = do_sys_utimes(l, fp->f_vnode, NULL, 0, SCARG(uap, tptr), 3748 UIO_USERSPACE); 3749 fd_putfile(SCARG(uap, fd)); 3750 return (error); 3751 } 3752 3753 int 3754 sys_futimens(struct lwp *l, const struct sys_futimens_args *uap, 3755 register_t *retval) 3756 { 3757 /* { 3758 syscallarg(int) fd; 3759 syscallarg(const struct timespec *) tptr; 3760 } */ 3761 int error; 3762 file_t *fp; 3763 3764 /* fd_getvnode() will use the descriptor for us */ 3765 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3766 return (error); 3767 error = do_sys_utimensat(l, AT_FDCWD, fp->f_vnode, NULL, 0, 3768 SCARG(uap, tptr), UIO_USERSPACE); 3769 fd_putfile(SCARG(uap, fd)); 3770 return (error); 3771 } 3772 3773 /* 3774 * Set the access and modification times given a path name; this 3775 * version does not follow links. 3776 */ 3777 int 3778 sys___lutimes50(struct lwp *l, const struct sys___lutimes50_args *uap, 3779 register_t *retval) 3780 { 3781 /* { 3782 syscallarg(const char *) path; 3783 syscallarg(const struct timeval *) tptr; 3784 } */ 3785 3786 return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW, 3787 SCARG(uap, tptr), UIO_USERSPACE); 3788 } 3789 3790 int 3791 sys_utimensat(struct lwp *l, const struct sys_utimensat_args *uap, 3792 register_t *retval) 3793 { 3794 /* { 3795 syscallarg(int) fd; 3796 syscallarg(const char *) path; 3797 syscallarg(const struct timespec *) tptr; 3798 syscallarg(int) flag; 3799 } */ 3800 int follow; 3801 const struct timespec *tptr; 3802 int error; 3803 3804 tptr = SCARG(uap, tptr); 3805 follow = (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 3806 3807 error = do_sys_utimensat(l, SCARG(uap, fd), NULL, 3808 SCARG(uap, path), follow, tptr, UIO_USERSPACE); 3809 3810 return error; 3811 } 3812 3813 /* 3814 * Common routine to set access and modification times given a vnode. 3815 */ 3816 int 3817 do_sys_utimens(struct lwp *l, struct vnode *vp, const char *path, int flag, 3818 const struct timespec *tptr, enum uio_seg seg) 3819 { 3820 return do_sys_utimensat(l, AT_FDCWD, vp, path, flag, tptr, seg); 3821 } 3822 3823 int 3824 do_sys_utimensat(struct lwp *l, int fdat, struct vnode *vp, 3825 const char *path, int flag, const struct timespec *tptr, enum uio_seg seg) 3826 { 3827 struct vattr vattr; 3828 int error, dorele = 0; 3829 namei_simple_flags_t sflags; 3830 bool vanull, setbirthtime; 3831 struct timespec ts[2]; 3832 3833 KASSERT(l != NULL || fdat == AT_FDCWD); 3834 3835 /* 3836 * I have checked all callers and they pass either FOLLOW, 3837 * NOFOLLOW, or 0 (when they don't pass a path), and NOFOLLOW 3838 * is 0. More to the point, they don't pass anything else. 3839 * Let's keep it that way at least until the namei interfaces 3840 * are fully sanitized. 3841 */ 3842 KASSERT(flag == NOFOLLOW || flag == FOLLOW); 3843 sflags = (flag == FOLLOW) ? 3844 NSM_FOLLOW_TRYEMULROOT : NSM_NOFOLLOW_TRYEMULROOT; 3845 3846 if (tptr == NULL) { 3847 vanull = true; 3848 nanotime(&ts[0]); 3849 ts[1] = ts[0]; 3850 } else { 3851 vanull = false; 3852 if (seg != UIO_SYSSPACE) { 3853 error = copyin(tptr, ts, sizeof (ts)); 3854 if (error != 0) 3855 return error; 3856 } else { 3857 ts[0] = tptr[0]; 3858 ts[1] = tptr[1]; 3859 } 3860 } 3861 3862 if (ts[0].tv_nsec == UTIME_NOW) { 3863 nanotime(&ts[0]); 3864 if (ts[1].tv_nsec == UTIME_NOW) { 3865 vanull = true; 3866 ts[1] = ts[0]; 3867 } 3868 } else if (ts[1].tv_nsec == UTIME_NOW) 3869 nanotime(&ts[1]); 3870 3871 if (vp == NULL) { 3872 /* note: SEG describes TPTR, not PATH; PATH is always user */ 3873 error = fd_nameiat_simple_user(l, fdat, path, sflags, &vp); 3874 if (error != 0) 3875 return error; 3876 dorele = 1; 3877 } 3878 3879 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3880 setbirthtime = (VOP_GETATTR(vp, &vattr, l->l_cred) == 0 && 3881 timespeccmp(&ts[1], &vattr.va_birthtime, <)); 3882 vattr_null(&vattr); 3883 3884 if (ts[0].tv_nsec != UTIME_OMIT) 3885 vattr.va_atime = ts[0]; 3886 3887 if (ts[1].tv_nsec != UTIME_OMIT) { 3888 vattr.va_mtime = ts[1]; 3889 if (setbirthtime) 3890 vattr.va_birthtime = ts[1]; 3891 } 3892 3893 if (vanull) 3894 vattr.va_vaflags |= VA_UTIMES_NULL; 3895 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3896 VOP_UNLOCK(vp); 3897 3898 if (dorele != 0) 3899 vrele(vp); 3900 3901 return error; 3902 } 3903 3904 int 3905 do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag, 3906 const struct timeval *tptr, enum uio_seg seg) 3907 { 3908 struct timespec ts[2]; 3909 struct timespec *tsptr = NULL; 3910 int error; 3911 3912 if (tptr != NULL) { 3913 struct timeval tv[2]; 3914 3915 if (seg != UIO_SYSSPACE) { 3916 error = copyin(tptr, tv, sizeof(tv)); 3917 if (error != 0) 3918 return error; 3919 tptr = tv; 3920 } 3921 3922 if ((tptr[0].tv_usec == UTIME_NOW) || 3923 (tptr[0].tv_usec == UTIME_OMIT)) 3924 ts[0].tv_nsec = tptr[0].tv_usec; 3925 else 3926 TIMEVAL_TO_TIMESPEC(&tptr[0], &ts[0]); 3927 3928 if ((tptr[1].tv_usec == UTIME_NOW) || 3929 (tptr[1].tv_usec == UTIME_OMIT)) 3930 ts[1].tv_nsec = tptr[1].tv_usec; 3931 else 3932 TIMEVAL_TO_TIMESPEC(&tptr[1], &ts[1]); 3933 3934 tsptr = &ts[0]; 3935 } 3936 3937 return do_sys_utimens(l, vp, path, flag, tsptr, UIO_SYSSPACE); 3938 } 3939 3940 /* 3941 * Truncate a file given its path name. 3942 */ 3943 /* ARGSUSED */ 3944 int 3945 sys_truncate(struct lwp *l, const struct sys_truncate_args *uap, register_t *retval) 3946 { 3947 /* { 3948 syscallarg(const char *) path; 3949 syscallarg(int) pad; 3950 syscallarg(off_t) length; 3951 } */ 3952 struct vnode *vp; 3953 struct vattr vattr; 3954 int error; 3955 3956 if (SCARG(uap, length) < 0) 3957 return EINVAL; 3958 3959 error = namei_simple_user(SCARG(uap, path), 3960 NSM_FOLLOW_TRYEMULROOT, &vp); 3961 if (error != 0) 3962 return (error); 3963 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3964 if (vp->v_type == VDIR) 3965 error = EISDIR; 3966 else if ((error = vn_writechk(vp)) == 0 && 3967 (error = VOP_ACCESS(vp, VWRITE, l->l_cred)) == 0) { 3968 vattr_null(&vattr); 3969 vattr.va_size = SCARG(uap, length); 3970 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3971 } 3972 vput(vp); 3973 return (error); 3974 } 3975 3976 /* 3977 * Truncate a file given a file descriptor. 3978 */ 3979 /* ARGSUSED */ 3980 int 3981 sys_ftruncate(struct lwp *l, const struct sys_ftruncate_args *uap, register_t *retval) 3982 { 3983 /* { 3984 syscallarg(int) fd; 3985 syscallarg(int) pad; 3986 syscallarg(off_t) length; 3987 } */ 3988 struct vattr vattr; 3989 struct vnode *vp; 3990 file_t *fp; 3991 int error; 3992 3993 if (SCARG(uap, length) < 0) 3994 return EINVAL; 3995 3996 /* fd_getvnode() will use the descriptor for us */ 3997 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3998 return (error); 3999 if ((fp->f_flag & FWRITE) == 0) { 4000 error = EINVAL; 4001 goto out; 4002 } 4003 vp = fp->f_vnode; 4004 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4005 if (vp->v_type == VDIR) 4006 error = EISDIR; 4007 else if ((error = vn_writechk(vp)) == 0) { 4008 vattr_null(&vattr); 4009 vattr.va_size = SCARG(uap, length); 4010 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 4011 } 4012 VOP_UNLOCK(vp); 4013 out: 4014 fd_putfile(SCARG(uap, fd)); 4015 return (error); 4016 } 4017 4018 /* 4019 * Sync an open file. 4020 */ 4021 /* ARGSUSED */ 4022 int 4023 sys_fsync(struct lwp *l, const struct sys_fsync_args *uap, register_t *retval) 4024 { 4025 /* { 4026 syscallarg(int) fd; 4027 } */ 4028 struct vnode *vp; 4029 file_t *fp; 4030 int error; 4031 4032 /* fd_getvnode() will use the descriptor for us */ 4033 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4034 return (error); 4035 vp = fp->f_vnode; 4036 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4037 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0); 4038 VOP_UNLOCK(vp); 4039 fd_putfile(SCARG(uap, fd)); 4040 return (error); 4041 } 4042 4043 /* 4044 * Sync a range of file data. API modeled after that found in AIX. 4045 * 4046 * FDATASYNC indicates that we need only save enough metadata to be able 4047 * to re-read the written data. Note we duplicate AIX's requirement that 4048 * the file be open for writing. 4049 */ 4050 /* ARGSUSED */ 4051 int 4052 sys_fsync_range(struct lwp *l, const struct sys_fsync_range_args *uap, register_t *retval) 4053 { 4054 /* { 4055 syscallarg(int) fd; 4056 syscallarg(int) flags; 4057 syscallarg(off_t) start; 4058 syscallarg(off_t) length; 4059 } */ 4060 struct vnode *vp; 4061 file_t *fp; 4062 int flags, nflags; 4063 off_t s, e, len; 4064 int error; 4065 4066 /* fd_getvnode() will use the descriptor for us */ 4067 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4068 return (error); 4069 4070 if ((fp->f_flag & FWRITE) == 0) { 4071 error = EBADF; 4072 goto out; 4073 } 4074 4075 flags = SCARG(uap, flags); 4076 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 4077 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 4078 error = EINVAL; 4079 goto out; 4080 } 4081 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 4082 if (flags & FDATASYNC) 4083 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 4084 else 4085 nflags = FSYNC_WAIT; 4086 if (flags & FDISKSYNC) 4087 nflags |= FSYNC_CACHE; 4088 4089 len = SCARG(uap, length); 4090 /* If length == 0, we do the whole file, and s = e = 0 will do that */ 4091 if (len) { 4092 s = SCARG(uap, start); 4093 e = s + len; 4094 if (e < s) { 4095 error = EINVAL; 4096 goto out; 4097 } 4098 } else { 4099 e = 0; 4100 s = 0; 4101 } 4102 4103 vp = fp->f_vnode; 4104 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4105 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e); 4106 VOP_UNLOCK(vp); 4107 out: 4108 fd_putfile(SCARG(uap, fd)); 4109 return (error); 4110 } 4111 4112 /* 4113 * Sync the data of an open file. 4114 */ 4115 /* ARGSUSED */ 4116 int 4117 sys_fdatasync(struct lwp *l, const struct sys_fdatasync_args *uap, register_t *retval) 4118 { 4119 /* { 4120 syscallarg(int) fd; 4121 } */ 4122 struct vnode *vp; 4123 file_t *fp; 4124 int error; 4125 4126 /* fd_getvnode() will use the descriptor for us */ 4127 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4128 return (error); 4129 if ((fp->f_flag & FWRITE) == 0) { 4130 fd_putfile(SCARG(uap, fd)); 4131 return (EBADF); 4132 } 4133 vp = fp->f_vnode; 4134 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4135 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0); 4136 VOP_UNLOCK(vp); 4137 fd_putfile(SCARG(uap, fd)); 4138 return (error); 4139 } 4140 4141 /* 4142 * Rename files, (standard) BSD semantics frontend. 4143 */ 4144 /* ARGSUSED */ 4145 int 4146 sys_rename(struct lwp *l, const struct sys_rename_args *uap, register_t *retval) 4147 { 4148 /* { 4149 syscallarg(const char *) from; 4150 syscallarg(const char *) to; 4151 } */ 4152 4153 return (do_sys_renameat(l, AT_FDCWD, SCARG(uap, from), AT_FDCWD, 4154 SCARG(uap, to), UIO_USERSPACE, 0)); 4155 } 4156 4157 int 4158 sys_renameat(struct lwp *l, const struct sys_renameat_args *uap, 4159 register_t *retval) 4160 { 4161 /* { 4162 syscallarg(int) fromfd; 4163 syscallarg(const char *) from; 4164 syscallarg(int) tofd; 4165 syscallarg(const char *) to; 4166 } */ 4167 4168 return (do_sys_renameat(l, SCARG(uap, fromfd), SCARG(uap, from), 4169 SCARG(uap, tofd), SCARG(uap, to), UIO_USERSPACE, 0)); 4170 } 4171 4172 /* 4173 * Rename files, POSIX semantics frontend. 4174 */ 4175 /* ARGSUSED */ 4176 int 4177 sys___posix_rename(struct lwp *l, const struct sys___posix_rename_args *uap, register_t *retval) 4178 { 4179 /* { 4180 syscallarg(const char *) from; 4181 syscallarg(const char *) to; 4182 } */ 4183 4184 return (do_sys_renameat(l, AT_FDCWD, SCARG(uap, from), AT_FDCWD, 4185 SCARG(uap, to), UIO_USERSPACE, 1)); 4186 } 4187 4188 /* 4189 * Rename files. Source and destination must either both be directories, 4190 * or both not be directories. If target is a directory, it must be empty. 4191 * If `from' and `to' refer to the same object, the value of the `retain' 4192 * argument is used to determine whether `from' will be 4193 * 4194 * (retain == 0) deleted unless `from' and `to' refer to the same 4195 * object in the file system's name space (BSD). 4196 * (retain == 1) always retained (POSIX). 4197 * 4198 * XXX Synchronize with nfsrv_rename in nfs_serv.c. 4199 */ 4200 int 4201 do_sys_rename(const char *from, const char *to, enum uio_seg seg, int retain) 4202 { 4203 return do_sys_renameat(NULL, AT_FDCWD, from, AT_FDCWD, to, seg, retain); 4204 } 4205 4206 static int 4207 do_sys_renameat(struct lwp *l, int fromfd, const char *from, int tofd, 4208 const char *to, enum uio_seg seg, int retain) 4209 { 4210 struct pathbuf *fpb, *tpb; 4211 struct nameidata fnd, tnd; 4212 struct vnode *fdvp, *fvp; 4213 struct vnode *tdvp, *tvp; 4214 struct mount *mp, *tmp; 4215 int error; 4216 4217 KASSERT(l != NULL || (fromfd == AT_FDCWD && tofd == AT_FDCWD)); 4218 4219 error = pathbuf_maybe_copyin(from, seg, &fpb); 4220 if (error) 4221 goto out0; 4222 KASSERT(fpb != NULL); 4223 4224 error = pathbuf_maybe_copyin(to, seg, &tpb); 4225 if (error) 4226 goto out1; 4227 KASSERT(tpb != NULL); 4228 4229 /* 4230 * Lookup from. 4231 * 4232 * XXX LOCKPARENT is wrong because we don't actually want it 4233 * locked yet, but (a) namei is insane, and (b) VOP_RENAME is 4234 * insane, so for the time being we need to leave it like this. 4235 */ 4236 NDINIT(&fnd, DELETE, (LOCKPARENT | TRYEMULROOT), fpb); 4237 if ((error = fd_nameiat(l, fromfd, &fnd)) != 0) 4238 goto out2; 4239 4240 /* 4241 * Pull out the important results of the lookup, fdvp and fvp. 4242 * Of course, fvp is bogus because we're about to unlock fdvp. 4243 */ 4244 fdvp = fnd.ni_dvp; 4245 fvp = fnd.ni_vp; 4246 mp = fdvp->v_mount; 4247 KASSERT(fdvp != NULL); 4248 KASSERT(fvp != NULL); 4249 KASSERT((fdvp == fvp) || (VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE)); 4250 /* 4251 * Bracket the operation with fstrans_start()/fstrans_done(). 4252 * 4253 * Inside the bracket this file system cannot be unmounted so 4254 * a vnode on this file system cannot change its v_mount. 4255 * A vnode on another file system may still change to dead mount. 4256 */ 4257 fstrans_start(mp); 4258 4259 /* 4260 * Make sure neither fdvp nor fvp is locked. 4261 */ 4262 if (fdvp != fvp) 4263 VOP_UNLOCK(fdvp); 4264 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4265 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4266 4267 /* 4268 * Reject renaming `.' and `..'. Can't do this until after 4269 * namei because we need namei's parsing to find the final 4270 * component name. (namei should just leave us with the final 4271 * component name and not look it up itself, but anyway...) 4272 * 4273 * This was here before because we used to relookup from 4274 * instead of to and relookup requires the caller to check 4275 * this, but now file systems may depend on this check, so we 4276 * must retain it until the file systems are all rototilled. 4277 */ 4278 if (((fnd.ni_cnd.cn_namelen == 1) && 4279 (fnd.ni_cnd.cn_nameptr[0] == '.')) || 4280 ((fnd.ni_cnd.cn_namelen == 2) && 4281 (fnd.ni_cnd.cn_nameptr[0] == '.') && 4282 (fnd.ni_cnd.cn_nameptr[1] == '.'))) { 4283 error = EINVAL; /* XXX EISDIR? */ 4284 goto abort0; 4285 } 4286 4287 /* 4288 * Lookup to. 4289 * 4290 * XXX LOCKPARENT is wrong, but...insanity, &c. Also, using 4291 * fvp here to decide whether to add CREATEDIR is a load of 4292 * bollocks because fvp might be the wrong node by now, since 4293 * fdvp is unlocked. 4294 * 4295 * XXX Why not pass CREATEDIR always? 4296 */ 4297 NDINIT(&tnd, RENAME, 4298 (LOCKPARENT | NOCACHE | TRYEMULROOT | 4299 ((fvp->v_type == VDIR)? CREATEDIR : 0)), 4300 tpb); 4301 if ((error = fd_nameiat(l, tofd, &tnd)) != 0) 4302 goto abort0; 4303 4304 /* 4305 * Pull out the important results of the lookup, tdvp and tvp. 4306 * Of course, tvp is bogus because we're about to unlock tdvp. 4307 */ 4308 tdvp = tnd.ni_dvp; 4309 tvp = tnd.ni_vp; 4310 KASSERT(tdvp != NULL); 4311 KASSERT((tdvp == tvp) || (VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE)); 4312 4313 /* 4314 * Make sure neither tdvp nor tvp is locked. 4315 */ 4316 if (tdvp != tvp) 4317 VOP_UNLOCK(tdvp); 4318 /* XXX KASSERT(VOP_ISLOCKED(tdvp) != LK_EXCLUSIVE); */ 4319 /* XXX KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) != LK_EXCLUSIVE)); */ 4320 4321 /* 4322 * Reject renaming onto `.' or `..'. relookup is unhappy with 4323 * these, which is why we must do this here. Once upon a time 4324 * we relooked up from instead of to, and consequently didn't 4325 * need this check, but now that we relookup to instead of 4326 * from, we need this; and we shall need it forever forward 4327 * until the VOP_RENAME protocol changes, because file systems 4328 * will no doubt begin to depend on this check. 4329 */ 4330 if ((tnd.ni_cnd.cn_namelen == 1) && (tnd.ni_cnd.cn_nameptr[0] == '.')) { 4331 error = EISDIR; 4332 goto abort1; 4333 } 4334 if ((tnd.ni_cnd.cn_namelen == 2) && 4335 (tnd.ni_cnd.cn_nameptr[0] == '.') && 4336 (tnd.ni_cnd.cn_nameptr[1] == '.')) { 4337 error = EINVAL; 4338 goto abort1; 4339 } 4340 4341 /* 4342 * Make sure the mount points match. Although we don't hold 4343 * any vnode locks, the v_mount on fdvp file system are stable. 4344 * 4345 * Unmounting another file system at an inopportune moment may 4346 * cause tdvp to disappear and change its v_mount to dead. 4347 * 4348 * So in either case different v_mount means cross-device rename. 4349 */ 4350 KASSERT(mp != NULL); 4351 tmp = tdvp->v_mount; 4352 4353 if (mp != tmp) { 4354 error = EXDEV; 4355 goto abort1; 4356 } 4357 4358 /* 4359 * Take the vfs rename lock to avoid cross-directory screw cases. 4360 * Nothing is locked currently, so taking this lock is safe. 4361 */ 4362 error = VFS_RENAMELOCK_ENTER(mp); 4363 if (error) 4364 goto abort1; 4365 4366 /* 4367 * Now fdvp, fvp, tdvp, and (if nonnull) tvp are referenced, 4368 * and nothing is locked except for the vfs rename lock. 4369 * 4370 * The next step is a little rain dance to conform to the 4371 * insane lock protocol, even though it does nothing to ward 4372 * off race conditions. 4373 * 4374 * We need tdvp and tvp to be locked. However, because we have 4375 * unlocked tdvp in order to hold no locks while we take the 4376 * vfs rename lock, tvp may be wrong here, and we can't safely 4377 * lock it even if the sensible file systems will just unlock 4378 * it straight away. Consequently, we must lock tdvp and then 4379 * relookup tvp to get it locked. 4380 * 4381 * Finally, because the VOP_RENAME protocol is brain-damaged 4382 * and various file systems insanely depend on the semantics of 4383 * this brain damage, the lookup of to must be the last lookup 4384 * before VOP_RENAME. 4385 */ 4386 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 4387 error = relookup(tdvp, &tnd.ni_vp, &tnd.ni_cnd, 0); 4388 if (error) 4389 goto abort2; 4390 4391 /* 4392 * Drop the old tvp and pick up the new one -- which might be 4393 * the same, but that doesn't matter to us. After this, tdvp 4394 * and tvp should both be locked. 4395 */ 4396 if (tvp != NULL) 4397 vrele(tvp); 4398 tvp = tnd.ni_vp; 4399 KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 4400 KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 4401 4402 /* 4403 * The old do_sys_rename had various consistency checks here 4404 * involving fvp and tvp. fvp is bogus already here, and tvp 4405 * will become bogus soon in any sensible file system, so the 4406 * only purpose in putting these checks here is to give lip 4407 * service to these screw cases and to acknowledge that they 4408 * exist, not actually to handle them, but here you go 4409 * anyway... 4410 */ 4411 4412 /* 4413 * Acknowledge that directories and non-directories aren't 4414 * suposed to mix. 4415 */ 4416 if (tvp != NULL) { 4417 if ((fvp->v_type == VDIR) && (tvp->v_type != VDIR)) { 4418 error = ENOTDIR; 4419 goto abort3; 4420 } else if ((fvp->v_type != VDIR) && (tvp->v_type == VDIR)) { 4421 error = EISDIR; 4422 goto abort3; 4423 } 4424 } 4425 4426 /* 4427 * Acknowledge some random screw case, among the dozens that 4428 * might arise. 4429 */ 4430 if (fvp == tdvp) { 4431 error = EINVAL; 4432 goto abort3; 4433 } 4434 4435 /* 4436 * Acknowledge that POSIX has a wacky screw case. 4437 * 4438 * XXX Eventually the retain flag needs to be passed on to 4439 * VOP_RENAME. 4440 */ 4441 if (fvp == tvp) { 4442 if (retain) { 4443 error = 0; 4444 goto abort3; 4445 } else if ((fdvp == tdvp) && 4446 (fnd.ni_cnd.cn_namelen == tnd.ni_cnd.cn_namelen) && 4447 (0 == memcmp(fnd.ni_cnd.cn_nameptr, tnd.ni_cnd.cn_nameptr, 4448 fnd.ni_cnd.cn_namelen))) { 4449 error = 0; 4450 goto abort3; 4451 } 4452 } 4453 4454 /* 4455 * Make sure veriexec can screw us up. (But a race can screw 4456 * up veriexec, of course -- remember, fvp and (soon) tvp are 4457 * bogus.) 4458 */ 4459 #if NVERIEXEC > 0 4460 { 4461 char *f1, *f2; 4462 size_t f1_len; 4463 size_t f2_len; 4464 4465 f1_len = fnd.ni_cnd.cn_namelen + 1; 4466 f1 = kmem_alloc(f1_len, KM_SLEEP); 4467 strlcpy(f1, fnd.ni_cnd.cn_nameptr, f1_len); 4468 4469 f2_len = tnd.ni_cnd.cn_namelen + 1; 4470 f2 = kmem_alloc(f2_len, KM_SLEEP); 4471 strlcpy(f2, tnd.ni_cnd.cn_nameptr, f2_len); 4472 4473 error = veriexec_renamechk(curlwp, fvp, f1, tvp, f2); 4474 4475 kmem_free(f1, f1_len); 4476 kmem_free(f2, f2_len); 4477 4478 if (error) 4479 goto abort3; 4480 } 4481 #endif /* NVERIEXEC > 0 */ 4482 4483 /* 4484 * All ready. Incant the rename vop. 4485 */ 4486 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4487 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4488 KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 4489 KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 4490 error = VOP_RENAME(fdvp, fvp, &fnd.ni_cnd, tdvp, tvp, &tnd.ni_cnd); 4491 4492 /* 4493 * VOP_RENAME releases fdvp, fvp, tdvp, and tvp, and unlocks 4494 * tdvp and tvp. But we can't assert any of that. 4495 */ 4496 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4497 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4498 /* XXX KASSERT(VOP_ISLOCKED(tdvp) != LK_EXCLUSIVE); */ 4499 /* XXX KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) != LK_EXCLUSIVE)); */ 4500 4501 /* 4502 * So all we have left to do is to drop the rename lock and 4503 * destroy the pathbufs. 4504 */ 4505 VFS_RENAMELOCK_EXIT(mp); 4506 fstrans_done(mp); 4507 goto out2; 4508 4509 abort3: if ((tvp != NULL) && (tvp != tdvp)) 4510 VOP_UNLOCK(tvp); 4511 abort2: VOP_UNLOCK(tdvp); 4512 VFS_RENAMELOCK_EXIT(mp); 4513 abort1: VOP_ABORTOP(tdvp, &tnd.ni_cnd); 4514 vrele(tdvp); 4515 if (tvp != NULL) 4516 vrele(tvp); 4517 abort0: VOP_ABORTOP(fdvp, &fnd.ni_cnd); 4518 vrele(fdvp); 4519 vrele(fvp); 4520 fstrans_done(mp); 4521 out2: pathbuf_destroy(tpb); 4522 out1: pathbuf_destroy(fpb); 4523 out0: return error; 4524 } 4525 4526 /* 4527 * Make a directory file. 4528 */ 4529 /* ARGSUSED */ 4530 int 4531 sys_mkdir(struct lwp *l, const struct sys_mkdir_args *uap, register_t *retval) 4532 { 4533 /* { 4534 syscallarg(const char *) path; 4535 syscallarg(int) mode; 4536 } */ 4537 4538 return do_sys_mkdirat(l, AT_FDCWD, SCARG(uap, path), 4539 SCARG(uap, mode), UIO_USERSPACE); 4540 } 4541 4542 int 4543 sys_mkdirat(struct lwp *l, const struct sys_mkdirat_args *uap, 4544 register_t *retval) 4545 { 4546 /* { 4547 syscallarg(int) fd; 4548 syscallarg(const char *) path; 4549 syscallarg(int) mode; 4550 } */ 4551 4552 return do_sys_mkdirat(l, SCARG(uap, fd), SCARG(uap, path), 4553 SCARG(uap, mode), UIO_USERSPACE); 4554 } 4555 4556 4557 int 4558 do_sys_mkdir(const char *path, mode_t mode, enum uio_seg seg) 4559 { 4560 return do_sys_mkdirat(NULL, AT_FDCWD, path, mode, seg); 4561 } 4562 4563 static int 4564 do_sys_mkdirat(struct lwp *l, int fdat, const char *path, mode_t mode, 4565 enum uio_seg seg) 4566 { 4567 struct proc *p = curlwp->l_proc; 4568 struct vnode *vp; 4569 struct vattr vattr; 4570 int error; 4571 struct pathbuf *pb; 4572 struct nameidata nd; 4573 4574 KASSERT(l != NULL || fdat == AT_FDCWD); 4575 4576 /* XXX bollocks, should pass in a pathbuf */ 4577 error = pathbuf_maybe_copyin(path, seg, &pb); 4578 if (error) { 4579 return error; 4580 } 4581 4582 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT, pb); 4583 4584 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 4585 pathbuf_destroy(pb); 4586 return (error); 4587 } 4588 vp = nd.ni_vp; 4589 if (vp != NULL) { 4590 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 4591 if (nd.ni_dvp == vp) 4592 vrele(nd.ni_dvp); 4593 else 4594 vput(nd.ni_dvp); 4595 vrele(vp); 4596 pathbuf_destroy(pb); 4597 return (EEXIST); 4598 } 4599 vattr_null(&vattr); 4600 vattr.va_type = VDIR; 4601 /* We will read cwdi->cwdi_cmask unlocked. */ 4602 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 4603 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 4604 if (!error) 4605 vrele(nd.ni_vp); 4606 vput(nd.ni_dvp); 4607 pathbuf_destroy(pb); 4608 return (error); 4609 } 4610 4611 /* 4612 * Remove a directory file. 4613 */ 4614 /* ARGSUSED */ 4615 int 4616 sys_rmdir(struct lwp *l, const struct sys_rmdir_args *uap, register_t *retval) 4617 { 4618 return do_sys_unlinkat(l, AT_FDCWD, SCARG(uap, path), 4619 AT_REMOVEDIR, UIO_USERSPACE); 4620 } 4621 4622 /* 4623 * Read a block of directory entries in a file system independent format. 4624 */ 4625 int 4626 sys___getdents30(struct lwp *l, const struct sys___getdents30_args *uap, register_t *retval) 4627 { 4628 /* { 4629 syscallarg(int) fd; 4630 syscallarg(char *) buf; 4631 syscallarg(size_t) count; 4632 } */ 4633 file_t *fp; 4634 int error, done; 4635 4636 /* fd_getvnode() will use the descriptor for us */ 4637 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4638 return (error); 4639 if ((fp->f_flag & FREAD) == 0) { 4640 error = EBADF; 4641 goto out; 4642 } 4643 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 4644 SCARG(uap, count), &done, l, 0, 0); 4645 ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, buf), done, error); 4646 *retval = done; 4647 out: 4648 fd_putfile(SCARG(uap, fd)); 4649 return (error); 4650 } 4651 4652 /* 4653 * Set the mode mask for creation of filesystem nodes. 4654 */ 4655 int 4656 sys_umask(struct lwp *l, const struct sys_umask_args *uap, register_t *retval) 4657 { 4658 /* { 4659 syscallarg(mode_t) newmask; 4660 } */ 4661 struct proc *p = l->l_proc; 4662 struct cwdinfo *cwdi; 4663 4664 /* 4665 * cwdi->cwdi_cmask will be read unlocked elsewhere. What's 4666 * important is that we serialize changes to the mask. The 4667 * rw_exit() will issue a write memory barrier on our behalf, 4668 * and force the changes out to other CPUs (as it must use an 4669 * atomic operation, draining the local CPU's store buffers). 4670 */ 4671 cwdi = p->p_cwdi; 4672 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 4673 *retval = cwdi->cwdi_cmask; 4674 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 4675 rw_exit(&cwdi->cwdi_lock); 4676 4677 return (0); 4678 } 4679 4680 int 4681 dorevoke(struct vnode *vp, kauth_cred_t cred) 4682 { 4683 struct vattr vattr; 4684 int error, fs_decision; 4685 4686 vn_lock(vp, LK_SHARED | LK_RETRY); 4687 error = VOP_GETATTR(vp, &vattr, cred); 4688 VOP_UNLOCK(vp); 4689 if (error != 0) 4690 return error; 4691 fs_decision = (kauth_cred_geteuid(cred) == vattr.va_uid) ? 0 : EPERM; 4692 error = kauth_authorize_vnode(cred, KAUTH_VNODE_REVOKE, vp, NULL, 4693 fs_decision); 4694 if (!error) 4695 VOP_REVOKE(vp, REVOKEALL); 4696 return (error); 4697 } 4698 4699 /* 4700 * Void all references to file by ripping underlying filesystem 4701 * away from vnode. 4702 */ 4703 /* ARGSUSED */ 4704 int 4705 sys_revoke(struct lwp *l, const struct sys_revoke_args *uap, register_t *retval) 4706 { 4707 /* { 4708 syscallarg(const char *) path; 4709 } */ 4710 struct vnode *vp; 4711 int error; 4712 4713 error = namei_simple_user(SCARG(uap, path), 4714 NSM_FOLLOW_TRYEMULROOT, &vp); 4715 if (error != 0) 4716 return (error); 4717 error = dorevoke(vp, l->l_cred); 4718 vrele(vp); 4719 return (error); 4720 } 4721 4722 /* 4723 * Allocate backing store for a file, filling a hole without having to 4724 * explicitly write anything out. 4725 */ 4726 /* ARGSUSED */ 4727 int 4728 sys_posix_fallocate(struct lwp *l, const struct sys_posix_fallocate_args *uap, 4729 register_t *retval) 4730 { 4731 /* { 4732 syscallarg(int) fd; 4733 syscallarg(off_t) pos; 4734 syscallarg(off_t) len; 4735 } */ 4736 int fd; 4737 off_t pos, len; 4738 struct file *fp; 4739 struct vnode *vp; 4740 int error; 4741 4742 fd = SCARG(uap, fd); 4743 pos = SCARG(uap, pos); 4744 len = SCARG(uap, len); 4745 4746 if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) { 4747 *retval = EINVAL; 4748 return 0; 4749 } 4750 4751 error = fd_getvnode(fd, &fp); 4752 if (error) { 4753 *retval = error; 4754 return 0; 4755 } 4756 if ((fp->f_flag & FWRITE) == 0) { 4757 error = EBADF; 4758 goto fail; 4759 } 4760 vp = fp->f_vnode; 4761 4762 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4763 if (vp->v_type == VDIR) { 4764 error = EISDIR; 4765 } else { 4766 error = VOP_FALLOCATE(vp, pos, len); 4767 } 4768 VOP_UNLOCK(vp); 4769 4770 fail: 4771 fd_putfile(fd); 4772 *retval = error; 4773 return 0; 4774 } 4775 4776 /* 4777 * Deallocate backing store for a file, creating a hole. Also used for 4778 * invoking TRIM on disks. 4779 */ 4780 /* ARGSUSED */ 4781 int 4782 sys_fdiscard(struct lwp *l, const struct sys_fdiscard_args *uap, 4783 register_t *retval) 4784 { 4785 /* { 4786 syscallarg(int) fd; 4787 syscallarg(off_t) pos; 4788 syscallarg(off_t) len; 4789 } */ 4790 int fd; 4791 off_t pos, len; 4792 struct file *fp; 4793 struct vnode *vp; 4794 int error; 4795 4796 fd = SCARG(uap, fd); 4797 pos = SCARG(uap, pos); 4798 len = SCARG(uap, len); 4799 4800 if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) { 4801 return EINVAL; 4802 } 4803 4804 error = fd_getvnode(fd, &fp); 4805 if (error) { 4806 return error; 4807 } 4808 if ((fp->f_flag & FWRITE) == 0) { 4809 error = EBADF; 4810 goto fail; 4811 } 4812 vp = fp->f_vnode; 4813 4814 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4815 if (vp->v_type == VDIR) { 4816 error = EISDIR; 4817 } else { 4818 error = VOP_FDISCARD(vp, pos, len); 4819 } 4820 VOP_UNLOCK(vp); 4821 4822 fail: 4823 fd_putfile(fd); 4824 return error; 4825 } 4826
Indexes created Fri Sep 26 20:09:58 GMT 2025