vfs_syscalls.c revision 1.513.2.1
1 /* $NetBSD: vfs_syscalls.c,v 1.513.2.1 2017/05/11 02:58:40 pgoyette 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 1.513.2.1 2017/05/11 02:58:40 pgoyette 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> 110 111 #include <miscfs/genfs/genfs.h> 112 #include <miscfs/specfs/specdev.h> 113 114 #include <nfs/rpcv2.h> 115 #include <nfs/nfsproto.h> 116 #include <nfs/nfs.h> 117 #include <nfs/nfs_var.h> 118 119 /* XXX this shouldn't be here */ 120 #ifndef OFF_T_MAX 121 #define OFF_T_MAX __type_max(off_t) 122 #endif 123 124 static int change_flags(struct vnode *, u_long, struct lwp *); 125 static int change_mode(struct vnode *, int, struct lwp *); 126 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); 127 static int do_sys_openat(lwp_t *, int, const char *, int, int, int *); 128 static int do_sys_mkdirat(struct lwp *l, int, const char *, mode_t, 129 enum uio_seg); 130 static int do_sys_mkfifoat(struct lwp *, int, const char *, mode_t); 131 static int do_sys_symlinkat(struct lwp *, const char *, int, const char *, 132 enum uio_seg); 133 static int do_sys_renameat(struct lwp *l, int, const char *, int, const char *, 134 enum uio_seg, int); 135 static int do_sys_readlinkat(struct lwp *, int, const char *, char *, 136 size_t, register_t *); 137 static int do_sys_unlinkat(struct lwp *, int, const char *, int, enum uio_seg); 138 139 static int fd_nameiat(struct lwp *, int, struct nameidata *); 140 static int fd_nameiat_simple_user(struct lwp *, int, const char *, 141 namei_simple_flags_t, struct vnode **); 142 143 144 /* 145 * This table is used to maintain compatibility with 4.3BSD 146 * and NetBSD 0.9 mount syscalls - and possibly other systems. 147 * Note, the order is important! 148 * 149 * Do not modify this table. It should only contain filesystems 150 * supported by NetBSD 0.9 and 4.3BSD. 151 */ 152 const char * const mountcompatnames[] = { 153 NULL, /* 0 = MOUNT_NONE */ 154 MOUNT_FFS, /* 1 = MOUNT_UFS */ 155 MOUNT_NFS, /* 2 */ 156 MOUNT_MFS, /* 3 */ 157 MOUNT_MSDOS, /* 4 */ 158 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 159 MOUNT_FDESC, /* 6 */ 160 MOUNT_KERNFS, /* 7 */ 161 NULL, /* 8 = MOUNT_DEVFS */ 162 MOUNT_AFS, /* 9 */ 163 }; 164 165 const int nmountcompatnames = __arraycount(mountcompatnames); 166 167 static int 168 fd_nameiat(struct lwp *l, int fdat, struct nameidata *ndp) 169 { 170 file_t *dfp; 171 int error; 172 173 if (fdat != AT_FDCWD) { 174 if ((error = fd_getvnode(fdat, &dfp)) != 0) 175 goto out; 176 177 NDAT(ndp, dfp->f_vnode); 178 } 179 180 error = namei(ndp); 181 182 if (fdat != AT_FDCWD) 183 fd_putfile(fdat); 184 out: 185 return error; 186 } 187 188 static int 189 fd_nameiat_simple_user(struct lwp *l, int fdat, const char *path, 190 namei_simple_flags_t sflags, struct vnode **vp_ret) 191 { 192 file_t *dfp; 193 struct vnode *dvp; 194 int error; 195 196 if (fdat != AT_FDCWD) { 197 if ((error = fd_getvnode(fdat, &dfp)) != 0) 198 goto out; 199 200 dvp = dfp->f_vnode; 201 } else { 202 dvp = NULL; 203 } 204 205 error = nameiat_simple_user(dvp, path, sflags, vp_ret); 206 207 if (fdat != AT_FDCWD) 208 fd_putfile(fdat); 209 out: 210 return error; 211 } 212 213 static int 214 open_setfp(struct lwp *l, file_t *fp, struct vnode *vp, int indx, int flags) 215 { 216 int error; 217 218 fp->f_flag = flags & FMASK; 219 fp->f_type = DTYPE_VNODE; 220 fp->f_ops = &vnops; 221 fp->f_vnode = vp; 222 223 if (flags & (O_EXLOCK | O_SHLOCK)) { 224 struct flock lf; 225 int type; 226 227 lf.l_whence = SEEK_SET; 228 lf.l_start = 0; 229 lf.l_len = 0; 230 if (flags & O_EXLOCK) 231 lf.l_type = F_WRLCK; 232 else 233 lf.l_type = F_RDLCK; 234 type = F_FLOCK; 235 if ((flags & FNONBLOCK) == 0) 236 type |= F_WAIT; 237 VOP_UNLOCK(vp); 238 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 239 if (error) { 240 (void) vn_close(vp, fp->f_flag, fp->f_cred); 241 fd_abort(l->l_proc, fp, indx); 242 return error; 243 } 244 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 245 atomic_or_uint(&fp->f_flag, FHASLOCK); 246 } 247 if (flags & O_CLOEXEC) 248 fd_set_exclose(l, indx, true); 249 return 0; 250 } 251 252 static int 253 mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags, 254 void *data, size_t *data_len) 255 { 256 struct mount *mp; 257 int error = 0, saved_flags; 258 259 mp = vp->v_mount; 260 saved_flags = mp->mnt_flag; 261 262 /* We can operate only on VV_ROOT nodes. */ 263 if ((vp->v_vflag & VV_ROOT) == 0) { 264 error = EINVAL; 265 goto out; 266 } 267 268 /* 269 * We only allow the filesystem to be reloaded if it 270 * is currently mounted read-only. Additionally, we 271 * prevent read-write to read-only downgrades. 272 */ 273 if ((flags & (MNT_RELOAD | MNT_RDONLY)) != 0 && 274 (mp->mnt_flag & MNT_RDONLY) == 0 && 275 (mp->mnt_iflag & IMNT_CAN_RWTORO) == 0) { 276 error = EOPNOTSUPP; /* Needs translation */ 277 goto out; 278 } 279 280 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 281 KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data); 282 if (error) 283 goto out; 284 285 error = vfs_suspend(mp, 0); 286 if (error) 287 goto out; 288 289 mutex_enter(&mp->mnt_updating); 290 291 mp->mnt_flag &= ~MNT_OP_FLAGS; 292 mp->mnt_flag |= flags & MNT_OP_FLAGS; 293 294 /* 295 * Set the mount level flags. 296 */ 297 if ((flags & MNT_RDONLY) != (mp->mnt_flag & MNT_RDONLY)) { 298 if ((flags & MNT_RDONLY)) 299 mp->mnt_iflag |= IMNT_WANTRDONLY; 300 else 301 mp->mnt_iflag |= IMNT_WANTRDWR; 302 } 303 mp->mnt_flag &= ~MNT_BASIC_FLAGS; 304 mp->mnt_flag |= flags & MNT_BASIC_FLAGS; 305 if ((mp->mnt_iflag & IMNT_WANTRDONLY)) 306 mp->mnt_flag &= ~MNT_RDONLY; 307 308 error = VFS_MOUNT(mp, path, data, data_len); 309 310 if (error && data != NULL) { 311 int error2; 312 313 /* 314 * Update failed; let's try and see if it was an 315 * export request. For compat with 3.0 and earlier. 316 */ 317 error2 = vfs_hooks_reexport(mp, path, data); 318 319 /* 320 * Only update error code if the export request was 321 * understood but some problem occurred while 322 * processing it. 323 */ 324 if (error2 != EJUSTRETURN) 325 error = error2; 326 } 327 328 if (error == 0 && (mp->mnt_iflag & IMNT_WANTRDONLY)) 329 mp->mnt_flag |= MNT_RDONLY; 330 if (error) 331 mp->mnt_flag = saved_flags; 332 mp->mnt_flag &= ~MNT_OP_FLAGS; 333 mp->mnt_iflag &= ~(IMNT_WANTRDONLY | IMNT_WANTRDWR); 334 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 335 if ((mp->mnt_iflag & IMNT_ONWORKLIST) == 0) 336 vfs_syncer_add_to_worklist(mp); 337 } else { 338 if ((mp->mnt_iflag & IMNT_ONWORKLIST) != 0) 339 vfs_syncer_remove_from_worklist(mp); 340 } 341 mutex_exit(&mp->mnt_updating); 342 vfs_resume(mp); 343 344 if ((error == 0) && !(saved_flags & MNT_EXTATTR) && 345 (flags & MNT_EXTATTR)) { 346 if (VFS_EXTATTRCTL(mp, EXTATTR_CMD_START, 347 NULL, 0, NULL) != 0) { 348 printf("%s: failed to start extattr, error = %d", 349 mp->mnt_stat.f_mntonname, error); 350 mp->mnt_flag &= ~MNT_EXTATTR; 351 } 352 } 353 354 if ((error == 0) && (saved_flags & MNT_EXTATTR) && 355 !(flags & MNT_EXTATTR)) { 356 if (VFS_EXTATTRCTL(mp, EXTATTR_CMD_STOP, 357 NULL, 0, NULL) != 0) { 358 printf("%s: failed to stop extattr, error = %d", 359 mp->mnt_stat.f_mntonname, error); 360 mp->mnt_flag |= MNT_RDONLY; 361 } 362 } 363 out: 364 return (error); 365 } 366 367 static int 368 mount_get_vfsops(const char *fstype, enum uio_seg type_seg, 369 struct vfsops **vfsops) 370 { 371 char fstypename[sizeof(((struct statvfs *)NULL)->f_fstypename)]; 372 int error; 373 374 if (type_seg == UIO_USERSPACE) { 375 /* Copy file-system type from userspace. */ 376 error = copyinstr(fstype, fstypename, sizeof(fstypename), NULL); 377 } else { 378 error = copystr(fstype, fstypename, sizeof(fstypename), NULL); 379 KASSERT(error == 0); 380 } 381 382 if (error) { 383 /* 384 * Historically, filesystem types were identified by numbers. 385 * If we get an integer for the filesystem type instead of a 386 * string, we check to see if it matches one of the historic 387 * filesystem types. 388 */ 389 u_long fsindex = (u_long)fstype; 390 if (fsindex >= nmountcompatnames || 391 mountcompatnames[fsindex] == NULL) 392 return ENODEV; 393 strlcpy(fstypename, mountcompatnames[fsindex], 394 sizeof(fstypename)); 395 } 396 397 /* Accept `ufs' as an alias for `ffs', for compatibility. */ 398 if (strcmp(fstypename, "ufs") == 0) 399 fstypename[0] = 'f'; 400 401 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 402 return 0; 403 404 /* If we can autoload a vfs module, try again */ 405 (void)module_autoload(fstypename, MODULE_CLASS_VFS); 406 407 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 408 return 0; 409 410 return ENODEV; 411 } 412 413 static int 414 mount_getargs(struct lwp *l, struct vnode *vp, const char *path, int flags, 415 void *data, size_t *data_len) 416 { 417 struct mount *mp; 418 int error; 419 420 /* If MNT_GETARGS is specified, it should be the only flag. */ 421 if (flags & ~MNT_GETARGS) 422 return EINVAL; 423 424 mp = vp->v_mount; 425 426 /* XXX: probably some notion of "can see" here if we want isolation. */ 427 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 428 KAUTH_REQ_SYSTEM_MOUNT_GET, mp, data, NULL); 429 if (error) 430 return error; 431 432 if ((vp->v_vflag & VV_ROOT) == 0) 433 return EINVAL; 434 435 if (vfs_busy(mp)) 436 return EPERM; 437 438 mutex_enter(&mp->mnt_updating); 439 mp->mnt_flag &= ~MNT_OP_FLAGS; 440 mp->mnt_flag |= MNT_GETARGS; 441 error = VFS_MOUNT(mp, path, data, data_len); 442 mp->mnt_flag &= ~MNT_OP_FLAGS; 443 mutex_exit(&mp->mnt_updating); 444 445 vfs_unbusy(mp); 446 return (error); 447 } 448 449 int 450 sys___mount50(struct lwp *l, const struct sys___mount50_args *uap, register_t *retval) 451 { 452 /* { 453 syscallarg(const char *) type; 454 syscallarg(const char *) path; 455 syscallarg(int) flags; 456 syscallarg(void *) data; 457 syscallarg(size_t) data_len; 458 } */ 459 460 return do_sys_mount(l, SCARG(uap, type), UIO_USERSPACE, SCARG(uap, path), 461 SCARG(uap, flags), SCARG(uap, data), UIO_USERSPACE, 462 SCARG(uap, data_len), retval); 463 } 464 465 int 466 do_sys_mount(struct lwp *l, const char *type, enum uio_seg type_seg, 467 const char *path, int flags, void *data, enum uio_seg data_seg, 468 size_t data_len, register_t *retval) 469 { 470 struct vfsops *vfsops = NULL; /* XXX gcc4.8 */ 471 struct vnode *vp; 472 void *data_buf = data; 473 bool vfsopsrele = false; 474 size_t alloc_sz = 0; 475 int error; 476 477 /* 478 * Get vnode to be covered 479 */ 480 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 481 if (error != 0) { 482 vp = NULL; 483 goto done; 484 } 485 486 if (flags & (MNT_GETARGS | MNT_UPDATE)) { 487 vfsops = vp->v_mount->mnt_op; 488 } else { 489 /* 'type' is userspace */ 490 error = mount_get_vfsops(type, type_seg, &vfsops); 491 if (error != 0) 492 goto done; 493 vfsopsrele = true; 494 } 495 496 /* 497 * We allow data to be NULL, even for userspace. Some fs's don't need 498 * it. The others will handle NULL. 499 */ 500 if (data != NULL && data_seg == UIO_USERSPACE) { 501 if (data_len == 0) { 502 /* No length supplied, use default for filesystem */ 503 data_len = vfsops->vfs_min_mount_data; 504 505 /* 506 * Hopefully a longer buffer won't make copyin() fail. 507 * For compatibility with 3.0 and earlier. 508 */ 509 if (flags & MNT_UPDATE 510 && data_len < sizeof (struct mnt_export_args30)) 511 data_len = sizeof (struct mnt_export_args30); 512 } 513 if ((data_len == 0) || (data_len > VFS_MAX_MOUNT_DATA)) { 514 error = EINVAL; 515 goto done; 516 } 517 alloc_sz = data_len; 518 data_buf = kmem_alloc(alloc_sz, KM_SLEEP); 519 520 /* NFS needs the buffer even for mnt_getargs .... */ 521 error = copyin(data, data_buf, data_len); 522 if (error != 0) 523 goto done; 524 } 525 526 if (flags & MNT_GETARGS) { 527 if (data_len == 0) { 528 error = EINVAL; 529 goto done; 530 } 531 error = mount_getargs(l, vp, path, flags, data_buf, &data_len); 532 if (error != 0) 533 goto done; 534 if (data_seg == UIO_USERSPACE) 535 error = copyout(data_buf, data, data_len); 536 *retval = data_len; 537 } else if (flags & MNT_UPDATE) { 538 error = mount_update(l, vp, path, flags, data_buf, &data_len); 539 } else { 540 /* Locking is handled internally in mount_domount(). */ 541 KASSERT(vfsopsrele == true); 542 error = mount_domount(l, &vp, vfsops, path, flags, data_buf, 543 &data_len); 544 vfsopsrele = false; 545 } 546 547 done: 548 if (vfsopsrele) 549 vfs_delref(vfsops); 550 if (vp != NULL) { 551 vrele(vp); 552 } 553 if (data_buf != data) 554 kmem_free(data_buf, alloc_sz); 555 return (error); 556 } 557 558 /* 559 * Unmount a file system. 560 * 561 * Note: unmount takes a path to the vnode mounted on as argument, 562 * not special file (as before). 563 */ 564 /* ARGSUSED */ 565 int 566 sys_unmount(struct lwp *l, const struct sys_unmount_args *uap, register_t *retval) 567 { 568 /* { 569 syscallarg(const char *) path; 570 syscallarg(int) flags; 571 } */ 572 struct vnode *vp; 573 struct mount *mp; 574 int error; 575 struct pathbuf *pb; 576 struct nameidata nd; 577 578 error = pathbuf_copyin(SCARG(uap, path), &pb); 579 if (error) { 580 return error; 581 } 582 583 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, pb); 584 if ((error = namei(&nd)) != 0) { 585 pathbuf_destroy(pb); 586 return error; 587 } 588 vp = nd.ni_vp; 589 pathbuf_destroy(pb); 590 591 mp = vp->v_mount; 592 vfs_ref(mp); 593 VOP_UNLOCK(vp); 594 595 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 596 KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT, mp, NULL, NULL); 597 if (error) { 598 vrele(vp); 599 vfs_rele(mp); 600 return (error); 601 } 602 603 /* 604 * Don't allow unmounting the root file system. 605 */ 606 if (mp->mnt_flag & MNT_ROOTFS) { 607 vrele(vp); 608 vfs_rele(mp); 609 return (EINVAL); 610 } 611 612 /* 613 * Must be the root of the filesystem 614 */ 615 if ((vp->v_vflag & VV_ROOT) == 0) { 616 vrele(vp); 617 vfs_rele(mp); 618 return (EINVAL); 619 } 620 621 vrele(vp); 622 error = dounmount(mp, SCARG(uap, flags), l); 623 vfs_rele(mp); 624 return error; 625 } 626 627 /* 628 * Sync each mounted filesystem. 629 */ 630 #ifdef DEBUG 631 int syncprt = 0; 632 struct ctldebug debug0 = { "syncprt", &syncprt }; 633 #endif 634 635 void 636 do_sys_sync(struct lwp *l) 637 { 638 mount_iterator_t *iter; 639 struct mount *mp; 640 int asyncflag; 641 642 mountlist_iterator_init(&iter); 643 while ((mp = mountlist_iterator_next(iter)) != NULL) { 644 mutex_enter(&mp->mnt_updating); 645 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 646 asyncflag = mp->mnt_flag & MNT_ASYNC; 647 mp->mnt_flag &= ~MNT_ASYNC; 648 VFS_SYNC(mp, MNT_NOWAIT, l->l_cred); 649 if (asyncflag) 650 mp->mnt_flag |= MNT_ASYNC; 651 } 652 mutex_exit(&mp->mnt_updating); 653 } 654 mountlist_iterator_destroy(iter); 655 #ifdef DEBUG 656 if (syncprt) 657 vfs_bufstats(); 658 #endif /* DEBUG */ 659 } 660 661 /* ARGSUSED */ 662 int 663 sys_sync(struct lwp *l, const void *v, register_t *retval) 664 { 665 do_sys_sync(l); 666 return (0); 667 } 668 669 670 /* 671 * Access or change filesystem quotas. 672 * 673 * (this is really 14 different calls bundled into one) 674 */ 675 676 static int 677 do_sys_quotactl_stat(struct mount *mp, struct quotastat *info_u) 678 { 679 struct quotastat info_k; 680 int error; 681 682 /* ensure any padding bytes are cleared */ 683 memset(&info_k, 0, sizeof(info_k)); 684 685 error = vfs_quotactl_stat(mp, &info_k); 686 if (error) { 687 return error; 688 } 689 690 return copyout(&info_k, info_u, sizeof(info_k)); 691 } 692 693 static int 694 do_sys_quotactl_idtypestat(struct mount *mp, int idtype, 695 struct quotaidtypestat *info_u) 696 { 697 struct quotaidtypestat info_k; 698 int error; 699 700 /* ensure any padding bytes are cleared */ 701 memset(&info_k, 0, sizeof(info_k)); 702 703 error = vfs_quotactl_idtypestat(mp, idtype, &info_k); 704 if (error) { 705 return error; 706 } 707 708 return copyout(&info_k, info_u, sizeof(info_k)); 709 } 710 711 static int 712 do_sys_quotactl_objtypestat(struct mount *mp, int objtype, 713 struct quotaobjtypestat *info_u) 714 { 715 struct quotaobjtypestat info_k; 716 int error; 717 718 /* ensure any padding bytes are cleared */ 719 memset(&info_k, 0, sizeof(info_k)); 720 721 error = vfs_quotactl_objtypestat(mp, objtype, &info_k); 722 if (error) { 723 return error; 724 } 725 726 return copyout(&info_k, info_u, sizeof(info_k)); 727 } 728 729 static int 730 do_sys_quotactl_get(struct mount *mp, const struct quotakey *key_u, 731 struct quotaval *val_u) 732 { 733 struct quotakey key_k; 734 struct quotaval val_k; 735 int error; 736 737 /* ensure any padding bytes are cleared */ 738 memset(&val_k, 0, sizeof(val_k)); 739 740 error = copyin(key_u, &key_k, sizeof(key_k)); 741 if (error) { 742 return error; 743 } 744 745 error = vfs_quotactl_get(mp, &key_k, &val_k); 746 if (error) { 747 return error; 748 } 749 750 return copyout(&val_k, val_u, sizeof(val_k)); 751 } 752 753 static int 754 do_sys_quotactl_put(struct mount *mp, const struct quotakey *key_u, 755 const struct quotaval *val_u) 756 { 757 struct quotakey key_k; 758 struct quotaval val_k; 759 int error; 760 761 error = copyin(key_u, &key_k, sizeof(key_k)); 762 if (error) { 763 return error; 764 } 765 766 error = copyin(val_u, &val_k, sizeof(val_k)); 767 if (error) { 768 return error; 769 } 770 771 return vfs_quotactl_put(mp, &key_k, &val_k); 772 } 773 774 static int 775 do_sys_quotactl_del(struct mount *mp, const struct quotakey *key_u) 776 { 777 struct quotakey key_k; 778 int error; 779 780 error = copyin(key_u, &key_k, sizeof(key_k)); 781 if (error) { 782 return error; 783 } 784 785 return vfs_quotactl_del(mp, &key_k); 786 } 787 788 static int 789 do_sys_quotactl_cursoropen(struct mount *mp, struct quotakcursor *cursor_u) 790 { 791 struct quotakcursor cursor_k; 792 int error; 793 794 /* ensure any padding bytes are cleared */ 795 memset(&cursor_k, 0, sizeof(cursor_k)); 796 797 error = vfs_quotactl_cursoropen(mp, &cursor_k); 798 if (error) { 799 return error; 800 } 801 802 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 803 } 804 805 static int 806 do_sys_quotactl_cursorclose(struct mount *mp, struct quotakcursor *cursor_u) 807 { 808 struct quotakcursor cursor_k; 809 int error; 810 811 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 812 if (error) { 813 return error; 814 } 815 816 return vfs_quotactl_cursorclose(mp, &cursor_k); 817 } 818 819 static int 820 do_sys_quotactl_cursorskipidtype(struct mount *mp, 821 struct quotakcursor *cursor_u, int idtype) 822 { 823 struct quotakcursor cursor_k; 824 int error; 825 826 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 827 if (error) { 828 return error; 829 } 830 831 error = vfs_quotactl_cursorskipidtype(mp, &cursor_k, idtype); 832 if (error) { 833 return error; 834 } 835 836 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 837 } 838 839 static int 840 do_sys_quotactl_cursorget(struct mount *mp, struct quotakcursor *cursor_u, 841 struct quotakey *keys_u, struct quotaval *vals_u, unsigned maxnum, 842 unsigned *ret_u) 843 { 844 #define CGET_STACK_MAX 8 845 struct quotakcursor cursor_k; 846 struct quotakey stackkeys[CGET_STACK_MAX]; 847 struct quotaval stackvals[CGET_STACK_MAX]; 848 struct quotakey *keys_k; 849 struct quotaval *vals_k; 850 unsigned ret_k; 851 int error; 852 853 if (maxnum > 128) { 854 maxnum = 128; 855 } 856 857 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 858 if (error) { 859 return error; 860 } 861 862 if (maxnum <= CGET_STACK_MAX) { 863 keys_k = stackkeys; 864 vals_k = stackvals; 865 /* ensure any padding bytes are cleared */ 866 memset(keys_k, 0, maxnum * sizeof(keys_k[0])); 867 memset(vals_k, 0, maxnum * sizeof(vals_k[0])); 868 } else { 869 keys_k = kmem_zalloc(maxnum * sizeof(keys_k[0]), KM_SLEEP); 870 vals_k = kmem_zalloc(maxnum * sizeof(vals_k[0]), KM_SLEEP); 871 } 872 873 error = vfs_quotactl_cursorget(mp, &cursor_k, keys_k, vals_k, maxnum, 874 &ret_k); 875 if (error) { 876 goto fail; 877 } 878 879 error = copyout(keys_k, keys_u, ret_k * sizeof(keys_k[0])); 880 if (error) { 881 goto fail; 882 } 883 884 error = copyout(vals_k, vals_u, ret_k * sizeof(vals_k[0])); 885 if (error) { 886 goto fail; 887 } 888 889 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 890 if (error) { 891 goto fail; 892 } 893 894 /* do last to maximize the chance of being able to recover a failure */ 895 error = copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 896 897 fail: 898 if (keys_k != stackkeys) { 899 kmem_free(keys_k, maxnum * sizeof(keys_k[0])); 900 } 901 if (vals_k != stackvals) { 902 kmem_free(vals_k, maxnum * sizeof(vals_k[0])); 903 } 904 return error; 905 } 906 907 static int 908 do_sys_quotactl_cursoratend(struct mount *mp, struct quotakcursor *cursor_u, 909 int *ret_u) 910 { 911 struct quotakcursor cursor_k; 912 int ret_k; 913 int error; 914 915 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 916 if (error) { 917 return error; 918 } 919 920 error = vfs_quotactl_cursoratend(mp, &cursor_k, &ret_k); 921 if (error) { 922 return error; 923 } 924 925 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 926 if (error) { 927 return error; 928 } 929 930 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 931 } 932 933 static int 934 do_sys_quotactl_cursorrewind(struct mount *mp, struct quotakcursor *cursor_u) 935 { 936 struct quotakcursor cursor_k; 937 int error; 938 939 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 940 if (error) { 941 return error; 942 } 943 944 error = vfs_quotactl_cursorrewind(mp, &cursor_k); 945 if (error) { 946 return error; 947 } 948 949 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 950 } 951 952 static int 953 do_sys_quotactl_quotaon(struct mount *mp, int idtype, const char *path_u) 954 { 955 char *path_k; 956 int error; 957 958 /* XXX this should probably be a struct pathbuf */ 959 path_k = PNBUF_GET(); 960 error = copyin(path_u, path_k, PATH_MAX); 961 if (error) { 962 PNBUF_PUT(path_k); 963 return error; 964 } 965 966 error = vfs_quotactl_quotaon(mp, idtype, path_k); 967 968 PNBUF_PUT(path_k); 969 return error; 970 } 971 972 static int 973 do_sys_quotactl_quotaoff(struct mount *mp, int idtype) 974 { 975 return vfs_quotactl_quotaoff(mp, idtype); 976 } 977 978 int 979 do_sys_quotactl(const char *path_u, const struct quotactl_args *args) 980 { 981 struct mount *mp; 982 struct vnode *vp; 983 int error; 984 985 error = namei_simple_user(path_u, NSM_FOLLOW_TRYEMULROOT, &vp); 986 if (error != 0) 987 return (error); 988 mp = vp->v_mount; 989 990 switch (args->qc_op) { 991 case QUOTACTL_STAT: 992 error = do_sys_quotactl_stat(mp, args->u.stat.qc_info); 993 break; 994 case QUOTACTL_IDTYPESTAT: 995 error = do_sys_quotactl_idtypestat(mp, 996 args->u.idtypestat.qc_idtype, 997 args->u.idtypestat.qc_info); 998 break; 999 case QUOTACTL_OBJTYPESTAT: 1000 error = do_sys_quotactl_objtypestat(mp, 1001 args->u.objtypestat.qc_objtype, 1002 args->u.objtypestat.qc_info); 1003 break; 1004 case QUOTACTL_GET: 1005 error = do_sys_quotactl_get(mp, 1006 args->u.get.qc_key, 1007 args->u.get.qc_val); 1008 break; 1009 case QUOTACTL_PUT: 1010 error = do_sys_quotactl_put(mp, 1011 args->u.put.qc_key, 1012 args->u.put.qc_val); 1013 break; 1014 case QUOTACTL_DEL: 1015 error = do_sys_quotactl_del(mp, args->u.del.qc_key); 1016 break; 1017 case QUOTACTL_CURSOROPEN: 1018 error = do_sys_quotactl_cursoropen(mp, 1019 args->u.cursoropen.qc_cursor); 1020 break; 1021 case QUOTACTL_CURSORCLOSE: 1022 error = do_sys_quotactl_cursorclose(mp, 1023 args->u.cursorclose.qc_cursor); 1024 break; 1025 case QUOTACTL_CURSORSKIPIDTYPE: 1026 error = do_sys_quotactl_cursorskipidtype(mp, 1027 args->u.cursorskipidtype.qc_cursor, 1028 args->u.cursorskipidtype.qc_idtype); 1029 break; 1030 case QUOTACTL_CURSORGET: 1031 error = do_sys_quotactl_cursorget(mp, 1032 args->u.cursorget.qc_cursor, 1033 args->u.cursorget.qc_keys, 1034 args->u.cursorget.qc_vals, 1035 args->u.cursorget.qc_maxnum, 1036 args->u.cursorget.qc_ret); 1037 break; 1038 case QUOTACTL_CURSORATEND: 1039 error = do_sys_quotactl_cursoratend(mp, 1040 args->u.cursoratend.qc_cursor, 1041 args->u.cursoratend.qc_ret); 1042 break; 1043 case QUOTACTL_CURSORREWIND: 1044 error = do_sys_quotactl_cursorrewind(mp, 1045 args->u.cursorrewind.qc_cursor); 1046 break; 1047 case QUOTACTL_QUOTAON: 1048 error = do_sys_quotactl_quotaon(mp, 1049 args->u.quotaon.qc_idtype, 1050 args->u.quotaon.qc_quotafile); 1051 break; 1052 case QUOTACTL_QUOTAOFF: 1053 error = do_sys_quotactl_quotaoff(mp, 1054 args->u.quotaoff.qc_idtype); 1055 break; 1056 default: 1057 error = EINVAL; 1058 break; 1059 } 1060 1061 vrele(vp); 1062 return error; 1063 } 1064 1065 /* ARGSUSED */ 1066 int 1067 sys___quotactl(struct lwp *l, const struct sys___quotactl_args *uap, 1068 register_t *retval) 1069 { 1070 /* { 1071 syscallarg(const char *) path; 1072 syscallarg(struct quotactl_args *) args; 1073 } */ 1074 struct quotactl_args args; 1075 int error; 1076 1077 error = copyin(SCARG(uap, args), &args, sizeof(args)); 1078 if (error) { 1079 return error; 1080 } 1081 1082 return do_sys_quotactl(SCARG(uap, path), &args); 1083 } 1084 1085 int 1086 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 1087 int root) 1088 { 1089 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 1090 int error = 0; 1091 1092 /* 1093 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1094 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 1095 * overrides MNT_NOWAIT. 1096 */ 1097 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 1098 (flags != MNT_WAIT && flags != 0)) { 1099 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 1100 goto done; 1101 } 1102 1103 /* Get the filesystem stats now */ 1104 memset(sp, 0, sizeof(*sp)); 1105 if ((error = VFS_STATVFS(mp, sp)) != 0) { 1106 return error; 1107 } 1108 1109 if (cwdi->cwdi_rdir == NULL) 1110 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 1111 done: 1112 if (cwdi->cwdi_rdir != NULL) { 1113 size_t len; 1114 char *bp; 1115 char c; 1116 char *path = PNBUF_GET(); 1117 1118 bp = path + MAXPATHLEN; 1119 *--bp = '\0'; 1120 rw_enter(&cwdi->cwdi_lock, RW_READER); 1121 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 1122 MAXPATHLEN / 2, 0, l); 1123 rw_exit(&cwdi->cwdi_lock); 1124 if (error) { 1125 PNBUF_PUT(path); 1126 return error; 1127 } 1128 len = strlen(bp); 1129 if (len != 1) { 1130 /* 1131 * for mount points that are below our root, we can see 1132 * them, so we fix up the pathname and return them. The 1133 * rest we cannot see, so we don't allow viewing the 1134 * data. 1135 */ 1136 if (strncmp(bp, sp->f_mntonname, len) == 0 && 1137 ((c = sp->f_mntonname[len]) == '/' || c == '\0')) { 1138 (void)strlcpy(sp->f_mntonname, 1139 c == '\0' ? "/" : &sp->f_mntonname[len], 1140 sizeof(sp->f_mntonname)); 1141 } else { 1142 if (root) 1143 (void)strlcpy(sp->f_mntonname, "/", 1144 sizeof(sp->f_mntonname)); 1145 else 1146 error = EPERM; 1147 } 1148 } 1149 PNBUF_PUT(path); 1150 } 1151 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 1152 return error; 1153 } 1154 1155 /* 1156 * Get filesystem statistics by path. 1157 */ 1158 int 1159 do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb) 1160 { 1161 struct mount *mp; 1162 int error; 1163 struct vnode *vp; 1164 1165 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 1166 if (error != 0) 1167 return error; 1168 mp = vp->v_mount; 1169 error = dostatvfs(mp, sb, l, flags, 1); 1170 vrele(vp); 1171 return error; 1172 } 1173 1174 /* ARGSUSED */ 1175 int 1176 sys_statvfs1(struct lwp *l, const struct sys_statvfs1_args *uap, register_t *retval) 1177 { 1178 /* { 1179 syscallarg(const char *) path; 1180 syscallarg(struct statvfs *) buf; 1181 syscallarg(int) flags; 1182 } */ 1183 struct statvfs *sb; 1184 int error; 1185 1186 sb = STATVFSBUF_GET(); 1187 error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb); 1188 if (error == 0) 1189 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1190 STATVFSBUF_PUT(sb); 1191 return error; 1192 } 1193 1194 /* 1195 * Get filesystem statistics by fd. 1196 */ 1197 int 1198 do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb) 1199 { 1200 file_t *fp; 1201 struct mount *mp; 1202 int error; 1203 1204 /* fd_getvnode() will use the descriptor for us */ 1205 if ((error = fd_getvnode(fd, &fp)) != 0) 1206 return (error); 1207 mp = fp->f_vnode->v_mount; 1208 error = dostatvfs(mp, sb, curlwp, flags, 1); 1209 fd_putfile(fd); 1210 return error; 1211 } 1212 1213 /* ARGSUSED */ 1214 int 1215 sys_fstatvfs1(struct lwp *l, const struct sys_fstatvfs1_args *uap, register_t *retval) 1216 { 1217 /* { 1218 syscallarg(int) fd; 1219 syscallarg(struct statvfs *) buf; 1220 syscallarg(int) flags; 1221 } */ 1222 struct statvfs *sb; 1223 int error; 1224 1225 sb = STATVFSBUF_GET(); 1226 error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb); 1227 if (error == 0) 1228 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1229 STATVFSBUF_PUT(sb); 1230 return error; 1231 } 1232 1233 1234 /* 1235 * Get statistics on all filesystems. 1236 */ 1237 int 1238 do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags, 1239 int (*copyfn)(const void *, void *, size_t), size_t entry_sz, 1240 register_t *retval) 1241 { 1242 int root = 0; 1243 mount_iterator_t *iter; 1244 struct proc *p = l->l_proc; 1245 struct mount *mp; 1246 struct statvfs *sb; 1247 size_t count, maxcount; 1248 int error = 0; 1249 1250 sb = STATVFSBUF_GET(); 1251 maxcount = bufsize / entry_sz; 1252 count = 0; 1253 mountlist_iterator_init(&iter); 1254 while ((mp = mountlist_iterator_next(iter)) != NULL) { 1255 if (sfsp && count < maxcount) { 1256 error = dostatvfs(mp, sb, l, flags, 0); 1257 if (error) { 1258 error = 0; 1259 continue; 1260 } 1261 error = copyfn(sb, sfsp, entry_sz); 1262 if (error) 1263 goto out; 1264 sfsp = (char *)sfsp + entry_sz; 1265 root |= strcmp(sb->f_mntonname, "/") == 0; 1266 } 1267 count++; 1268 } 1269 1270 if (root == 0 && p->p_cwdi->cwdi_rdir) { 1271 /* 1272 * fake a root entry 1273 */ 1274 error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, 1275 sb, l, flags, 1); 1276 if (error != 0) 1277 goto out; 1278 if (sfsp) { 1279 error = copyfn(sb, sfsp, entry_sz); 1280 if (error != 0) 1281 goto out; 1282 } 1283 count++; 1284 } 1285 if (sfsp && count > maxcount) 1286 *retval = maxcount; 1287 else 1288 *retval = count; 1289 out: 1290 mountlist_iterator_destroy(iter); 1291 STATVFSBUF_PUT(sb); 1292 return error; 1293 } 1294 1295 int 1296 sys_getvfsstat(struct lwp *l, const struct sys_getvfsstat_args *uap, register_t *retval) 1297 { 1298 /* { 1299 syscallarg(struct statvfs *) buf; 1300 syscallarg(size_t) bufsize; 1301 syscallarg(int) flags; 1302 } */ 1303 1304 return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize), 1305 SCARG(uap, flags), copyout, sizeof (struct statvfs), retval); 1306 } 1307 1308 /* 1309 * Change current working directory to a given file descriptor. 1310 */ 1311 /* ARGSUSED */ 1312 int 1313 sys_fchdir(struct lwp *l, const struct sys_fchdir_args *uap, register_t *retval) 1314 { 1315 /* { 1316 syscallarg(int) fd; 1317 } */ 1318 struct proc *p = l->l_proc; 1319 struct cwdinfo *cwdi; 1320 struct vnode *vp, *tdp; 1321 struct mount *mp; 1322 file_t *fp; 1323 int error, fd; 1324 1325 /* fd_getvnode() will use the descriptor for us */ 1326 fd = SCARG(uap, fd); 1327 if ((error = fd_getvnode(fd, &fp)) != 0) 1328 return (error); 1329 vp = fp->f_vnode; 1330 1331 vref(vp); 1332 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1333 if (vp->v_type != VDIR) 1334 error = ENOTDIR; 1335 else 1336 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1337 if (error) { 1338 vput(vp); 1339 goto out; 1340 } 1341 while ((mp = vp->v_mountedhere) != NULL) { 1342 error = vfs_busy(mp); 1343 vput(vp); 1344 if (error != 0) 1345 goto out; 1346 error = VFS_ROOT(mp, &tdp); 1347 vfs_unbusy(mp); 1348 if (error) 1349 goto out; 1350 vp = tdp; 1351 } 1352 VOP_UNLOCK(vp); 1353 1354 /* 1355 * Disallow changing to a directory not under the process's 1356 * current root directory (if there is one). 1357 */ 1358 cwdi = p->p_cwdi; 1359 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1360 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 1361 vrele(vp); 1362 error = EPERM; /* operation not permitted */ 1363 } else { 1364 vrele(cwdi->cwdi_cdir); 1365 cwdi->cwdi_cdir = vp; 1366 } 1367 rw_exit(&cwdi->cwdi_lock); 1368 1369 out: 1370 fd_putfile(fd); 1371 return (error); 1372 } 1373 1374 /* 1375 * Change this process's notion of the root directory to a given file 1376 * descriptor. 1377 */ 1378 int 1379 sys_fchroot(struct lwp *l, const struct sys_fchroot_args *uap, register_t *retval) 1380 { 1381 struct proc *p = l->l_proc; 1382 struct vnode *vp; 1383 file_t *fp; 1384 int error, fd = SCARG(uap, fd); 1385 1386 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1387 KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) 1388 return error; 1389 /* fd_getvnode() will use the descriptor for us */ 1390 if ((error = fd_getvnode(fd, &fp)) != 0) 1391 return error; 1392 vp = fp->f_vnode; 1393 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1394 if (vp->v_type != VDIR) 1395 error = ENOTDIR; 1396 else 1397 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1398 VOP_UNLOCK(vp); 1399 if (error) 1400 goto out; 1401 vref(vp); 1402 1403 change_root(p->p_cwdi, vp, l); 1404 1405 out: 1406 fd_putfile(fd); 1407 return (error); 1408 } 1409 1410 /* 1411 * Change current working directory (``.''). 1412 */ 1413 /* ARGSUSED */ 1414 int 1415 sys_chdir(struct lwp *l, const struct sys_chdir_args *uap, register_t *retval) 1416 { 1417 /* { 1418 syscallarg(const char *) path; 1419 } */ 1420 struct proc *p = l->l_proc; 1421 struct cwdinfo *cwdi; 1422 int error; 1423 struct vnode *vp; 1424 1425 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1426 &vp, l)) != 0) 1427 return (error); 1428 cwdi = p->p_cwdi; 1429 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1430 vrele(cwdi->cwdi_cdir); 1431 cwdi->cwdi_cdir = vp; 1432 rw_exit(&cwdi->cwdi_lock); 1433 return (0); 1434 } 1435 1436 /* 1437 * Change notion of root (``/'') directory. 1438 */ 1439 /* ARGSUSED */ 1440 int 1441 sys_chroot(struct lwp *l, const struct sys_chroot_args *uap, register_t *retval) 1442 { 1443 /* { 1444 syscallarg(const char *) path; 1445 } */ 1446 struct proc *p = l->l_proc; 1447 int error; 1448 struct vnode *vp; 1449 1450 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1451 KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) 1452 return (error); 1453 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1454 &vp, l)) != 0) 1455 return (error); 1456 1457 change_root(p->p_cwdi, vp, l); 1458 1459 return (0); 1460 } 1461 1462 /* 1463 * Common routine for chroot and fchroot. 1464 * NB: callers need to properly authorize the change root operation. 1465 */ 1466 void 1467 change_root(struct cwdinfo *cwdi, struct vnode *vp, struct lwp *l) 1468 { 1469 struct proc *p = l->l_proc; 1470 kauth_cred_t ncred; 1471 1472 ncred = kauth_cred_alloc(); 1473 1474 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1475 if (cwdi->cwdi_rdir != NULL) 1476 vrele(cwdi->cwdi_rdir); 1477 cwdi->cwdi_rdir = vp; 1478 1479 /* 1480 * Prevent escaping from chroot by putting the root under 1481 * the working directory. Silently chdir to / if we aren't 1482 * already there. 1483 */ 1484 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1485 /* 1486 * XXX would be more failsafe to change directory to a 1487 * deadfs node here instead 1488 */ 1489 vrele(cwdi->cwdi_cdir); 1490 vref(vp); 1491 cwdi->cwdi_cdir = vp; 1492 } 1493 rw_exit(&cwdi->cwdi_lock); 1494 1495 /* Get a write lock on the process credential. */ 1496 proc_crmod_enter(); 1497 1498 kauth_cred_clone(p->p_cred, ncred); 1499 kauth_proc_chroot(ncred, p->p_cwdi); 1500 1501 /* Broadcast our credentials to the process and other LWPs. */ 1502 proc_crmod_leave(ncred, p->p_cred, true); 1503 } 1504 1505 /* 1506 * Common routine for chroot and chdir. 1507 * XXX "where" should be enum uio_seg 1508 */ 1509 int 1510 chdir_lookup(const char *path, int where, struct vnode **vpp, struct lwp *l) 1511 { 1512 struct pathbuf *pb; 1513 struct nameidata nd; 1514 int error; 1515 1516 error = pathbuf_maybe_copyin(path, where, &pb); 1517 if (error) { 1518 return error; 1519 } 1520 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1521 if ((error = namei(&nd)) != 0) { 1522 pathbuf_destroy(pb); 1523 return error; 1524 } 1525 *vpp = nd.ni_vp; 1526 pathbuf_destroy(pb); 1527 1528 if ((*vpp)->v_type != VDIR) 1529 error = ENOTDIR; 1530 else 1531 error = VOP_ACCESS(*vpp, VEXEC, l->l_cred); 1532 1533 if (error) 1534 vput(*vpp); 1535 else 1536 VOP_UNLOCK(*vpp); 1537 return (error); 1538 } 1539 1540 /* 1541 * Internals of sys_open - path has already been converted into a pathbuf 1542 * (so we can easily reuse this function from other parts of the kernel, 1543 * like posix_spawn post-processing). 1544 */ 1545 int 1546 do_open(lwp_t *l, struct vnode *dvp, struct pathbuf *pb, int open_flags, 1547 int open_mode, int *fd) 1548 { 1549 struct proc *p = l->l_proc; 1550 struct cwdinfo *cwdi = p->p_cwdi; 1551 file_t *fp; 1552 struct vnode *vp; 1553 int flags, cmode; 1554 int indx, error; 1555 struct nameidata nd; 1556 1557 if (open_flags & O_SEARCH) { 1558 open_flags &= ~(int)O_SEARCH; 1559 } 1560 1561 flags = FFLAGS(open_flags); 1562 if ((flags & (FREAD | FWRITE)) == 0) 1563 return EINVAL; 1564 1565 if ((error = fd_allocfile(&fp, &indx)) != 0) { 1566 return error; 1567 } 1568 1569 /* We're going to read cwdi->cwdi_cmask unlocked here. */ 1570 cmode = ((open_mode &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1571 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, pb); 1572 if (dvp != NULL) 1573 NDAT(&nd, dvp); 1574 1575 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1576 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1577 fd_abort(p, fp, indx); 1578 if ((error == EDUPFD || error == EMOVEFD) && 1579 l->l_dupfd >= 0 && /* XXX from fdopen */ 1580 (error = 1581 fd_dupopen(l->l_dupfd, &indx, flags, error)) == 0) { 1582 *fd = indx; 1583 return 0; 1584 } 1585 if (error == ERESTART) 1586 error = EINTR; 1587 return error; 1588 } 1589 1590 l->l_dupfd = 0; 1591 vp = nd.ni_vp; 1592 1593 if ((error = open_setfp(l, fp, vp, indx, flags))) 1594 return error; 1595 1596 VOP_UNLOCK(vp); 1597 *fd = indx; 1598 fd_affix(p, fp, indx); 1599 return 0; 1600 } 1601 1602 int 1603 fd_open(const char *path, int open_flags, int open_mode, int *fd) 1604 { 1605 struct pathbuf *pb; 1606 int error, oflags; 1607 1608 oflags = FFLAGS(open_flags); 1609 if ((oflags & (FREAD | FWRITE)) == 0) 1610 return EINVAL; 1611 1612 pb = pathbuf_create(path); 1613 if (pb == NULL) 1614 return ENOMEM; 1615 1616 error = do_open(curlwp, NULL, pb, open_flags, open_mode, fd); 1617 pathbuf_destroy(pb); 1618 1619 return error; 1620 } 1621 1622 /* 1623 * Check permissions, allocate an open file structure, 1624 * and call the device open routine if any. 1625 */ 1626 static int 1627 do_sys_openat(lwp_t *l, int fdat, const char *path, int flags, 1628 int mode, int *fd) 1629 { 1630 file_t *dfp = NULL; 1631 struct vnode *dvp = NULL; 1632 struct pathbuf *pb; 1633 int error; 1634 1635 #ifdef COMPAT_10 /* XXX: and perhaps later */ 1636 if (path == NULL) { 1637 pb = pathbuf_create("."); 1638 if (pb == NULL) 1639 return ENOMEM; 1640 } else 1641 #endif 1642 { 1643 error = pathbuf_copyin(path, &pb); 1644 if (error) 1645 return error; 1646 } 1647 1648 if (fdat != AT_FDCWD) { 1649 /* fd_getvnode() will use the descriptor for us */ 1650 if ((error = fd_getvnode(fdat, &dfp)) != 0) 1651 goto out; 1652 1653 dvp = dfp->f_vnode; 1654 } 1655 1656 error = do_open(l, dvp, pb, flags, mode, fd); 1657 1658 if (dfp != NULL) 1659 fd_putfile(fdat); 1660 out: 1661 pathbuf_destroy(pb); 1662 return error; 1663 } 1664 1665 int 1666 sys_open(struct lwp *l, const struct sys_open_args *uap, register_t *retval) 1667 { 1668 /* { 1669 syscallarg(const char *) path; 1670 syscallarg(int) flags; 1671 syscallarg(int) mode; 1672 } */ 1673 int error; 1674 int fd; 1675 1676 error = do_sys_openat(l, AT_FDCWD, SCARG(uap, path), 1677 SCARG(uap, flags), SCARG(uap, mode), &fd); 1678 1679 if (error == 0) 1680 *retval = fd; 1681 1682 return error; 1683 } 1684 1685 int 1686 sys_openat(struct lwp *l, const struct sys_openat_args *uap, register_t *retval) 1687 { 1688 /* { 1689 syscallarg(int) fd; 1690 syscallarg(const char *) path; 1691 syscallarg(int) oflags; 1692 syscallarg(int) mode; 1693 } */ 1694 int error; 1695 int fd; 1696 1697 error = do_sys_openat(l, SCARG(uap, fd), SCARG(uap, path), 1698 SCARG(uap, oflags), SCARG(uap, mode), &fd); 1699 1700 if (error == 0) 1701 *retval = fd; 1702 1703 return error; 1704 } 1705 1706 static void 1707 vfs__fhfree(fhandle_t *fhp) 1708 { 1709 size_t fhsize; 1710 1711 fhsize = FHANDLE_SIZE(fhp); 1712 kmem_free(fhp, fhsize); 1713 } 1714 1715 /* 1716 * vfs_composefh: compose a filehandle. 1717 */ 1718 1719 int 1720 vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) 1721 { 1722 struct mount *mp; 1723 struct fid *fidp; 1724 int error; 1725 size_t needfhsize; 1726 size_t fidsize; 1727 1728 mp = vp->v_mount; 1729 fidp = NULL; 1730 if (*fh_size < FHANDLE_SIZE_MIN) { 1731 fidsize = 0; 1732 } else { 1733 fidsize = *fh_size - offsetof(fhandle_t, fh_fid); 1734 if (fhp != NULL) { 1735 memset(fhp, 0, *fh_size); 1736 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1737 fidp = &fhp->fh_fid; 1738 } 1739 } 1740 error = VFS_VPTOFH(vp, fidp, &fidsize); 1741 needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1742 if (error == 0 && *fh_size < needfhsize) { 1743 error = E2BIG; 1744 } 1745 *fh_size = needfhsize; 1746 return error; 1747 } 1748 1749 int 1750 vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) 1751 { 1752 struct mount *mp; 1753 fhandle_t *fhp; 1754 size_t fhsize; 1755 size_t fidsize; 1756 int error; 1757 1758 mp = vp->v_mount; 1759 fidsize = 0; 1760 error = VFS_VPTOFH(vp, NULL, &fidsize); 1761 KASSERT(error != 0); 1762 if (error != E2BIG) { 1763 goto out; 1764 } 1765 fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1766 fhp = kmem_zalloc(fhsize, KM_SLEEP); 1767 if (fhp == NULL) { 1768 error = ENOMEM; 1769 goto out; 1770 } 1771 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1772 error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); 1773 if (error == 0) { 1774 KASSERT((FHANDLE_SIZE(fhp) == fhsize && 1775 FHANDLE_FILEID(fhp)->fid_len == fidsize)); 1776 *fhpp = fhp; 1777 } else { 1778 kmem_free(fhp, fhsize); 1779 } 1780 out: 1781 return error; 1782 } 1783 1784 void 1785 vfs_composefh_free(fhandle_t *fhp) 1786 { 1787 1788 vfs__fhfree(fhp); 1789 } 1790 1791 /* 1792 * vfs_fhtovp: lookup a vnode by a filehandle. 1793 */ 1794 1795 int 1796 vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) 1797 { 1798 struct mount *mp; 1799 int error; 1800 1801 *vpp = NULL; 1802 mp = vfs_getvfs(FHANDLE_FSID(fhp)); 1803 if (mp == NULL) { 1804 error = ESTALE; 1805 goto out; 1806 } 1807 if (mp->mnt_op->vfs_fhtovp == NULL) { 1808 error = EOPNOTSUPP; 1809 goto out; 1810 } 1811 error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp); 1812 out: 1813 return error; 1814 } 1815 1816 /* 1817 * vfs_copyinfh_alloc: allocate and copyin a filehandle, given 1818 * the needed size. 1819 */ 1820 1821 int 1822 vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) 1823 { 1824 fhandle_t *fhp; 1825 int error; 1826 1827 if (fhsize > FHANDLE_SIZE_MAX) { 1828 return EINVAL; 1829 } 1830 if (fhsize < FHANDLE_SIZE_MIN) { 1831 return EINVAL; 1832 } 1833 again: 1834 fhp = kmem_alloc(fhsize, KM_SLEEP); 1835 if (fhp == NULL) { 1836 return ENOMEM; 1837 } 1838 error = copyin(ufhp, fhp, fhsize); 1839 if (error == 0) { 1840 /* XXX this check shouldn't be here */ 1841 if (FHANDLE_SIZE(fhp) == fhsize) { 1842 *fhpp = fhp; 1843 return 0; 1844 } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { 1845 /* 1846 * a kludge for nfsv2 padded handles. 1847 */ 1848 size_t sz; 1849 1850 sz = FHANDLE_SIZE(fhp); 1851 kmem_free(fhp, fhsize); 1852 fhsize = sz; 1853 goto again; 1854 } else { 1855 /* 1856 * userland told us wrong size. 1857 */ 1858 error = EINVAL; 1859 } 1860 } 1861 kmem_free(fhp, fhsize); 1862 return error; 1863 } 1864 1865 void 1866 vfs_copyinfh_free(fhandle_t *fhp) 1867 { 1868 1869 vfs__fhfree(fhp); 1870 } 1871 1872 /* 1873 * Get file handle system call 1874 */ 1875 int 1876 sys___getfh30(struct lwp *l, const struct sys___getfh30_args *uap, register_t *retval) 1877 { 1878 /* { 1879 syscallarg(char *) fname; 1880 syscallarg(fhandle_t *) fhp; 1881 syscallarg(size_t *) fh_size; 1882 } */ 1883 struct vnode *vp; 1884 fhandle_t *fh; 1885 int error; 1886 struct pathbuf *pb; 1887 struct nameidata nd; 1888 size_t sz; 1889 size_t usz; 1890 1891 /* 1892 * Must be super user 1893 */ 1894 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1895 0, NULL, NULL, NULL); 1896 if (error) 1897 return (error); 1898 1899 error = pathbuf_copyin(SCARG(uap, fname), &pb); 1900 if (error) { 1901 return error; 1902 } 1903 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1904 error = namei(&nd); 1905 if (error) { 1906 pathbuf_destroy(pb); 1907 return error; 1908 } 1909 vp = nd.ni_vp; 1910 pathbuf_destroy(pb); 1911 1912 error = vfs_composefh_alloc(vp, &fh); 1913 vput(vp); 1914 if (error != 0) { 1915 return error; 1916 } 1917 error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); 1918 if (error != 0) { 1919 goto out; 1920 } 1921 sz = FHANDLE_SIZE(fh); 1922 error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); 1923 if (error != 0) { 1924 goto out; 1925 } 1926 if (usz >= sz) { 1927 error = copyout(fh, SCARG(uap, fhp), sz); 1928 } else { 1929 error = E2BIG; 1930 } 1931 out: 1932 vfs_composefh_free(fh); 1933 return (error); 1934 } 1935 1936 /* 1937 * Open a file given a file handle. 1938 * 1939 * Check permissions, allocate an open file structure, 1940 * and call the device open routine if any. 1941 */ 1942 1943 int 1944 dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, 1945 register_t *retval) 1946 { 1947 file_t *fp; 1948 struct vnode *vp = NULL; 1949 kauth_cred_t cred = l->l_cred; 1950 file_t *nfp; 1951 int indx, error; 1952 struct vattr va; 1953 fhandle_t *fh; 1954 int flags; 1955 proc_t *p; 1956 1957 p = curproc; 1958 1959 /* 1960 * Must be super user 1961 */ 1962 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1963 0, NULL, NULL, NULL))) 1964 return (error); 1965 1966 if (oflags & O_SEARCH) { 1967 oflags &= ~(int)O_SEARCH; 1968 } 1969 1970 flags = FFLAGS(oflags); 1971 if ((flags & (FREAD | FWRITE)) == 0) 1972 return (EINVAL); 1973 if ((flags & O_CREAT)) 1974 return (EINVAL); 1975 if ((error = fd_allocfile(&nfp, &indx)) != 0) 1976 return (error); 1977 fp = nfp; 1978 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1979 if (error != 0) { 1980 goto bad; 1981 } 1982 error = vfs_fhtovp(fh, &vp); 1983 vfs_copyinfh_free(fh); 1984 if (error != 0) { 1985 goto bad; 1986 } 1987 1988 /* Now do an effective vn_open */ 1989 1990 if (vp->v_type == VSOCK) { 1991 error = EOPNOTSUPP; 1992 goto bad; 1993 } 1994 error = vn_openchk(vp, cred, flags); 1995 if (error != 0) 1996 goto bad; 1997 if (flags & O_TRUNC) { 1998 VOP_UNLOCK(vp); /* XXX */ 1999 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 2000 vattr_null(&va); 2001 va.va_size = 0; 2002 error = VOP_SETATTR(vp, &va, cred); 2003 if (error) 2004 goto bad; 2005 } 2006 if ((error = VOP_OPEN(vp, flags, cred)) != 0) 2007 goto bad; 2008 if (flags & FWRITE) { 2009 mutex_enter(vp->v_interlock); 2010 vp->v_writecount++; 2011 mutex_exit(vp->v_interlock); 2012 } 2013 2014 /* done with modified vn_open, now finish what sys_open does. */ 2015 if ((error = open_setfp(l, fp, vp, indx, flags))) 2016 return error; 2017 2018 VOP_UNLOCK(vp); 2019 *retval = indx; 2020 fd_affix(p, fp, indx); 2021 return (0); 2022 2023 bad: 2024 fd_abort(p, fp, indx); 2025 if (vp != NULL) 2026 vput(vp); 2027 return (error); 2028 } 2029 2030 int 2031 sys___fhopen40(struct lwp *l, const struct sys___fhopen40_args *uap, register_t *retval) 2032 { 2033 /* { 2034 syscallarg(const void *) fhp; 2035 syscallarg(size_t) fh_size; 2036 syscallarg(int) flags; 2037 } */ 2038 2039 return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), 2040 SCARG(uap, flags), retval); 2041 } 2042 2043 int 2044 do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb) 2045 { 2046 int error; 2047 fhandle_t *fh; 2048 struct vnode *vp; 2049 2050 /* 2051 * Must be super user 2052 */ 2053 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2054 0, NULL, NULL, NULL))) 2055 return (error); 2056 2057 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2058 if (error != 0) 2059 return error; 2060 2061 error = vfs_fhtovp(fh, &vp); 2062 vfs_copyinfh_free(fh); 2063 if (error != 0) 2064 return error; 2065 2066 error = vn_stat(vp, sb); 2067 vput(vp); 2068 return error; 2069 } 2070 2071 2072 /* ARGSUSED */ 2073 int 2074 sys___fhstat50(struct lwp *l, const struct sys___fhstat50_args *uap, register_t *retval) 2075 { 2076 /* { 2077 syscallarg(const void *) fhp; 2078 syscallarg(size_t) fh_size; 2079 syscallarg(struct stat *) sb; 2080 } */ 2081 struct stat sb; 2082 int error; 2083 2084 error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb); 2085 if (error) 2086 return error; 2087 return copyout(&sb, SCARG(uap, sb), sizeof(sb)); 2088 } 2089 2090 int 2091 do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb, 2092 int flags) 2093 { 2094 fhandle_t *fh; 2095 struct mount *mp; 2096 struct vnode *vp; 2097 int error; 2098 2099 /* 2100 * Must be super user 2101 */ 2102 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2103 0, NULL, NULL, NULL))) 2104 return error; 2105 2106 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2107 if (error != 0) 2108 return error; 2109 2110 error = vfs_fhtovp(fh, &vp); 2111 vfs_copyinfh_free(fh); 2112 if (error != 0) 2113 return error; 2114 2115 mp = vp->v_mount; 2116 error = dostatvfs(mp, sb, l, flags, 1); 2117 vput(vp); 2118 return error; 2119 } 2120 2121 /* ARGSUSED */ 2122 int 2123 sys___fhstatvfs140(struct lwp *l, const struct sys___fhstatvfs140_args *uap, register_t *retval) 2124 { 2125 /* { 2126 syscallarg(const void *) fhp; 2127 syscallarg(size_t) fh_size; 2128 syscallarg(struct statvfs *) buf; 2129 syscallarg(int) flags; 2130 } */ 2131 struct statvfs *sb = STATVFSBUF_GET(); 2132 int error; 2133 2134 error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb, 2135 SCARG(uap, flags)); 2136 if (error == 0) 2137 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 2138 STATVFSBUF_PUT(sb); 2139 return error; 2140 } 2141 2142 /* 2143 * Create a special file. 2144 */ 2145 /* ARGSUSED */ 2146 int 2147 sys___mknod50(struct lwp *l, const struct sys___mknod50_args *uap, 2148 register_t *retval) 2149 { 2150 /* { 2151 syscallarg(const char *) path; 2152 syscallarg(mode_t) mode; 2153 syscallarg(dev_t) dev; 2154 } */ 2155 return do_sys_mknodat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap, mode), 2156 SCARG(uap, dev), retval, UIO_USERSPACE); 2157 } 2158 2159 int 2160 sys_mknodat(struct lwp *l, const struct sys_mknodat_args *uap, 2161 register_t *retval) 2162 { 2163 /* { 2164 syscallarg(int) fd; 2165 syscallarg(const char *) path; 2166 syscallarg(mode_t) mode; 2167 syscallarg(int) pad; 2168 syscallarg(dev_t) dev; 2169 } */ 2170 2171 return do_sys_mknodat(l, SCARG(uap, fd), SCARG(uap, path), 2172 SCARG(uap, mode), SCARG(uap, dev), retval, UIO_USERSPACE); 2173 } 2174 2175 int 2176 do_sys_mknod(struct lwp *l, const char *pathname, mode_t mode, dev_t dev, 2177 register_t *retval, enum uio_seg seg) 2178 { 2179 return do_sys_mknodat(l, AT_FDCWD, pathname, mode, dev, retval, seg); 2180 } 2181 2182 int 2183 do_sys_mknodat(struct lwp *l, int fdat, const char *pathname, mode_t mode, 2184 dev_t dev, register_t *retval, enum uio_seg seg) 2185 { 2186 struct proc *p = l->l_proc; 2187 struct vnode *vp; 2188 struct vattr vattr; 2189 int error, optype; 2190 struct pathbuf *pb; 2191 struct nameidata nd; 2192 const char *pathstring; 2193 2194 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 2195 0, NULL, NULL, NULL)) != 0) 2196 return (error); 2197 2198 optype = VOP_MKNOD_DESCOFFSET; 2199 2200 error = pathbuf_maybe_copyin(pathname, seg, &pb); 2201 if (error) { 2202 return error; 2203 } 2204 pathstring = pathbuf_stringcopy_get(pb); 2205 if (pathstring == NULL) { 2206 pathbuf_destroy(pb); 2207 return ENOMEM; 2208 } 2209 2210 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2211 2212 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2213 goto out; 2214 vp = nd.ni_vp; 2215 2216 if (vp != NULL) 2217 error = EEXIST; 2218 else { 2219 vattr_null(&vattr); 2220 /* We will read cwdi->cwdi_cmask unlocked. */ 2221 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2222 vattr.va_rdev = dev; 2223 2224 switch (mode & S_IFMT) { 2225 case S_IFMT: /* used by badsect to flag bad sectors */ 2226 vattr.va_type = VBAD; 2227 break; 2228 case S_IFCHR: 2229 vattr.va_type = VCHR; 2230 break; 2231 case S_IFBLK: 2232 vattr.va_type = VBLK; 2233 break; 2234 case S_IFWHT: 2235 optype = VOP_WHITEOUT_DESCOFFSET; 2236 break; 2237 case S_IFREG: 2238 #if NVERIEXEC > 0 2239 error = veriexec_openchk(l, nd.ni_vp, pathstring, 2240 O_CREAT); 2241 #endif /* NVERIEXEC > 0 */ 2242 vattr.va_type = VREG; 2243 vattr.va_rdev = VNOVAL; 2244 optype = VOP_CREATE_DESCOFFSET; 2245 break; 2246 default: 2247 error = EINVAL; 2248 break; 2249 } 2250 } 2251 if (error == 0 && optype == VOP_MKNOD_DESCOFFSET 2252 && vattr.va_rdev == VNOVAL) 2253 error = EINVAL; 2254 if (!error) { 2255 switch (optype) { 2256 case VOP_WHITEOUT_DESCOFFSET: 2257 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 2258 if (error) 2259 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2260 vput(nd.ni_dvp); 2261 break; 2262 2263 case VOP_MKNOD_DESCOFFSET: 2264 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 2265 &nd.ni_cnd, &vattr); 2266 if (error == 0) 2267 vrele(nd.ni_vp); 2268 vput(nd.ni_dvp); 2269 break; 2270 2271 case VOP_CREATE_DESCOFFSET: 2272 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, 2273 &nd.ni_cnd, &vattr); 2274 if (error == 0) 2275 vrele(nd.ni_vp); 2276 vput(nd.ni_dvp); 2277 break; 2278 } 2279 } else { 2280 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2281 if (nd.ni_dvp == vp) 2282 vrele(nd.ni_dvp); 2283 else 2284 vput(nd.ni_dvp); 2285 if (vp) 2286 vrele(vp); 2287 } 2288 out: 2289 pathbuf_stringcopy_put(pb, pathstring); 2290 pathbuf_destroy(pb); 2291 return (error); 2292 } 2293 2294 /* 2295 * Create a named pipe. 2296 */ 2297 /* ARGSUSED */ 2298 int 2299 sys_mkfifo(struct lwp *l, const struct sys_mkfifo_args *uap, register_t *retval) 2300 { 2301 /* { 2302 syscallarg(const char *) path; 2303 syscallarg(int) mode; 2304 } */ 2305 return do_sys_mkfifoat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap, mode)); 2306 } 2307 2308 int 2309 sys_mkfifoat(struct lwp *l, const struct sys_mkfifoat_args *uap, 2310 register_t *retval) 2311 { 2312 /* { 2313 syscallarg(int) fd; 2314 syscallarg(const char *) path; 2315 syscallarg(int) mode; 2316 } */ 2317 2318 return do_sys_mkfifoat(l, SCARG(uap, fd), SCARG(uap, path), 2319 SCARG(uap, mode)); 2320 } 2321 2322 static int 2323 do_sys_mkfifoat(struct lwp *l, int fdat, const char *path, mode_t mode) 2324 { 2325 struct proc *p = l->l_proc; 2326 struct vattr vattr; 2327 int error; 2328 struct pathbuf *pb; 2329 struct nameidata nd; 2330 2331 error = pathbuf_copyin(path, &pb); 2332 if (error) { 2333 return error; 2334 } 2335 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2336 2337 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 2338 pathbuf_destroy(pb); 2339 return error; 2340 } 2341 if (nd.ni_vp != NULL) { 2342 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2343 if (nd.ni_dvp == nd.ni_vp) 2344 vrele(nd.ni_dvp); 2345 else 2346 vput(nd.ni_dvp); 2347 vrele(nd.ni_vp); 2348 pathbuf_destroy(pb); 2349 return (EEXIST); 2350 } 2351 vattr_null(&vattr); 2352 vattr.va_type = VFIFO; 2353 /* We will read cwdi->cwdi_cmask unlocked. */ 2354 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2355 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2356 if (error == 0) 2357 vrele(nd.ni_vp); 2358 vput(nd.ni_dvp); 2359 pathbuf_destroy(pb); 2360 return (error); 2361 } 2362 2363 /* 2364 * Make a hard file link. 2365 */ 2366 /* ARGSUSED */ 2367 int 2368 do_sys_linkat(struct lwp *l, int fdpath, const char *path, int fdlink, 2369 const char *link, int follow, register_t *retval) 2370 { 2371 struct vnode *vp; 2372 struct pathbuf *linkpb; 2373 struct nameidata nd; 2374 namei_simple_flags_t ns_flags; 2375 int error; 2376 2377 if (follow & AT_SYMLINK_FOLLOW) 2378 ns_flags = NSM_FOLLOW_TRYEMULROOT; 2379 else 2380 ns_flags = NSM_NOFOLLOW_TRYEMULROOT; 2381 2382 error = fd_nameiat_simple_user(l, fdpath, path, ns_flags, &vp); 2383 if (error != 0) 2384 return (error); 2385 error = pathbuf_copyin(link, &linkpb); 2386 if (error) { 2387 goto out1; 2388 } 2389 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2390 if ((error = fd_nameiat(l, fdlink, &nd)) != 0) 2391 goto out2; 2392 if (nd.ni_vp) { 2393 error = EEXIST; 2394 goto abortop; 2395 } 2396 /* Prevent hard links on directories. */ 2397 if (vp->v_type == VDIR) { 2398 error = EPERM; 2399 goto abortop; 2400 } 2401 /* Prevent cross-mount operation. */ 2402 if (nd.ni_dvp->v_mount != vp->v_mount) { 2403 error = EXDEV; 2404 goto abortop; 2405 } 2406 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 2407 VOP_UNLOCK(nd.ni_dvp); 2408 vrele(nd.ni_dvp); 2409 out2: 2410 pathbuf_destroy(linkpb); 2411 out1: 2412 vrele(vp); 2413 return (error); 2414 abortop: 2415 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2416 if (nd.ni_dvp == nd.ni_vp) 2417 vrele(nd.ni_dvp); 2418 else 2419 vput(nd.ni_dvp); 2420 if (nd.ni_vp != NULL) 2421 vrele(nd.ni_vp); 2422 goto out2; 2423 } 2424 2425 int 2426 sys_link(struct lwp *l, const struct sys_link_args *uap, register_t *retval) 2427 { 2428 /* { 2429 syscallarg(const char *) path; 2430 syscallarg(const char *) link; 2431 } */ 2432 const char *path = SCARG(uap, path); 2433 const char *link = SCARG(uap, link); 2434 2435 return do_sys_linkat(l, AT_FDCWD, path, AT_FDCWD, link, 2436 AT_SYMLINK_FOLLOW, retval); 2437 } 2438 2439 int 2440 sys_linkat(struct lwp *l, const struct sys_linkat_args *uap, 2441 register_t *retval) 2442 { 2443 /* { 2444 syscallarg(int) fd1; 2445 syscallarg(const char *) name1; 2446 syscallarg(int) fd2; 2447 syscallarg(const char *) name2; 2448 syscallarg(int) flags; 2449 } */ 2450 int fd1 = SCARG(uap, fd1); 2451 const char *name1 = SCARG(uap, name1); 2452 int fd2 = SCARG(uap, fd2); 2453 const char *name2 = SCARG(uap, name2); 2454 int follow; 2455 2456 follow = SCARG(uap, flags) & AT_SYMLINK_FOLLOW; 2457 2458 return do_sys_linkat(l, fd1, name1, fd2, name2, follow, retval); 2459 } 2460 2461 2462 int 2463 do_sys_symlink(const char *patharg, const char *link, enum uio_seg seg) 2464 { 2465 return do_sys_symlinkat(NULL, patharg, AT_FDCWD, link, seg); 2466 } 2467 2468 static int 2469 do_sys_symlinkat(struct lwp *l, const char *patharg, int fdat, 2470 const char *link, enum uio_seg seg) 2471 { 2472 struct proc *p = curproc; 2473 struct vattr vattr; 2474 char *path; 2475 int error; 2476 struct pathbuf *linkpb; 2477 struct nameidata nd; 2478 2479 KASSERT(l != NULL || fdat == AT_FDCWD); 2480 2481 path = PNBUF_GET(); 2482 if (seg == UIO_USERSPACE) { 2483 if ((error = copyinstr(patharg, path, MAXPATHLEN, NULL)) != 0) 2484 goto out1; 2485 if ((error = pathbuf_copyin(link, &linkpb)) != 0) 2486 goto out1; 2487 } else { 2488 KASSERT(strlen(patharg) < MAXPATHLEN); 2489 strcpy(path, patharg); 2490 linkpb = pathbuf_create(link); 2491 if (linkpb == NULL) { 2492 error = ENOMEM; 2493 goto out1; 2494 } 2495 } 2496 ktrkuser("symlink-target", path, strlen(path)); 2497 2498 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2499 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2500 goto out2; 2501 if (nd.ni_vp) { 2502 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2503 if (nd.ni_dvp == nd.ni_vp) 2504 vrele(nd.ni_dvp); 2505 else 2506 vput(nd.ni_dvp); 2507 vrele(nd.ni_vp); 2508 error = EEXIST; 2509 goto out2; 2510 } 2511 vattr_null(&vattr); 2512 vattr.va_type = VLNK; 2513 /* We will read cwdi->cwdi_cmask unlocked. */ 2514 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 2515 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 2516 if (error == 0) 2517 vrele(nd.ni_vp); 2518 vput(nd.ni_dvp); 2519 out2: 2520 pathbuf_destroy(linkpb); 2521 out1: 2522 PNBUF_PUT(path); 2523 return (error); 2524 } 2525 2526 /* 2527 * Make a symbolic link. 2528 */ 2529 /* ARGSUSED */ 2530 int 2531 sys_symlink(struct lwp *l, const struct sys_symlink_args *uap, register_t *retval) 2532 { 2533 /* { 2534 syscallarg(const char *) path; 2535 syscallarg(const char *) link; 2536 } */ 2537 2538 return do_sys_symlinkat(l, SCARG(uap, path), AT_FDCWD, SCARG(uap, link), 2539 UIO_USERSPACE); 2540 } 2541 2542 int 2543 sys_symlinkat(struct lwp *l, const struct sys_symlinkat_args *uap, 2544 register_t *retval) 2545 { 2546 /* { 2547 syscallarg(const char *) path1; 2548 syscallarg(int) fd; 2549 syscallarg(const char *) path2; 2550 } */ 2551 2552 return do_sys_symlinkat(l, SCARG(uap, path1), SCARG(uap, fd), 2553 SCARG(uap, path2), UIO_USERSPACE); 2554 } 2555 2556 /* 2557 * Delete a whiteout from the filesystem. 2558 */ 2559 /* ARGSUSED */ 2560 int 2561 sys_undelete(struct lwp *l, const struct sys_undelete_args *uap, register_t *retval) 2562 { 2563 /* { 2564 syscallarg(const char *) path; 2565 } */ 2566 int error; 2567 struct pathbuf *pb; 2568 struct nameidata nd; 2569 2570 error = pathbuf_copyin(SCARG(uap, path), &pb); 2571 if (error) { 2572 return error; 2573 } 2574 2575 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT, pb); 2576 error = namei(&nd); 2577 if (error) { 2578 pathbuf_destroy(pb); 2579 return (error); 2580 } 2581 2582 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 2583 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2584 if (nd.ni_dvp == nd.ni_vp) 2585 vrele(nd.ni_dvp); 2586 else 2587 vput(nd.ni_dvp); 2588 if (nd.ni_vp) 2589 vrele(nd.ni_vp); 2590 pathbuf_destroy(pb); 2591 return (EEXIST); 2592 } 2593 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 2594 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2595 vput(nd.ni_dvp); 2596 pathbuf_destroy(pb); 2597 return (error); 2598 } 2599 2600 /* 2601 * Delete a name from the filesystem. 2602 */ 2603 /* ARGSUSED */ 2604 int 2605 sys_unlink(struct lwp *l, const struct sys_unlink_args *uap, register_t *retval) 2606 { 2607 /* { 2608 syscallarg(const char *) path; 2609 } */ 2610 2611 return do_sys_unlinkat(l, AT_FDCWD, SCARG(uap, path), 0, UIO_USERSPACE); 2612 } 2613 2614 int 2615 sys_unlinkat(struct lwp *l, const struct sys_unlinkat_args *uap, 2616 register_t *retval) 2617 { 2618 /* { 2619 syscallarg(int) fd; 2620 syscallarg(const char *) path; 2621 syscallarg(int) flag; 2622 } */ 2623 2624 return do_sys_unlinkat(l, SCARG(uap, fd), SCARG(uap, path), 2625 SCARG(uap, flag), UIO_USERSPACE); 2626 } 2627 2628 int 2629 do_sys_unlink(const char *arg, enum uio_seg seg) 2630 { 2631 return do_sys_unlinkat(NULL, AT_FDCWD, arg, 0, seg); 2632 } 2633 2634 static int 2635 do_sys_unlinkat(struct lwp *l, int fdat, const char *arg, int flags, 2636 enum uio_seg seg) 2637 { 2638 struct vnode *vp; 2639 int error; 2640 struct pathbuf *pb; 2641 struct nameidata nd; 2642 const char *pathstring; 2643 2644 KASSERT(l != NULL || fdat == AT_FDCWD); 2645 2646 error = pathbuf_maybe_copyin(arg, seg, &pb); 2647 if (error) { 2648 return error; 2649 } 2650 pathstring = pathbuf_stringcopy_get(pb); 2651 if (pathstring == NULL) { 2652 pathbuf_destroy(pb); 2653 return ENOMEM; 2654 } 2655 2656 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, pb); 2657 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2658 goto out; 2659 vp = nd.ni_vp; 2660 2661 /* 2662 * The root of a mounted filesystem cannot be deleted. 2663 */ 2664 if ((vp->v_vflag & VV_ROOT) != 0) { 2665 error = EBUSY; 2666 goto abort; 2667 } 2668 2669 if ((vp->v_type == VDIR) && (vp->v_mountedhere != NULL)) { 2670 error = EBUSY; 2671 goto abort; 2672 } 2673 2674 /* 2675 * No rmdir "." please. 2676 */ 2677 if (nd.ni_dvp == vp) { 2678 error = EINVAL; 2679 goto abort; 2680 } 2681 2682 /* 2683 * AT_REMOVEDIR is required to remove a directory 2684 */ 2685 if (vp->v_type == VDIR) { 2686 if (!(flags & AT_REMOVEDIR)) { 2687 error = EPERM; 2688 goto abort; 2689 } else { 2690 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2691 vput(nd.ni_dvp); 2692 goto out; 2693 } 2694 } 2695 2696 /* 2697 * Starting here we only deal with non directories. 2698 */ 2699 if (flags & AT_REMOVEDIR) { 2700 error = ENOTDIR; 2701 goto abort; 2702 } 2703 2704 #if NVERIEXEC > 0 2705 /* Handle remove requests for veriexec entries. */ 2706 if ((error = veriexec_removechk(curlwp, nd.ni_vp, pathstring)) != 0) { 2707 goto abort; 2708 } 2709 #endif /* NVERIEXEC > 0 */ 2710 2711 #ifdef FILEASSOC 2712 (void)fileassoc_file_delete(vp); 2713 #endif /* FILEASSOC */ 2714 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2715 vput(nd.ni_dvp); 2716 goto out; 2717 2718 abort: 2719 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2720 if (nd.ni_dvp == vp) 2721 vrele(nd.ni_dvp); 2722 else 2723 vput(nd.ni_dvp); 2724 vput(vp); 2725 2726 out: 2727 pathbuf_stringcopy_put(pb, pathstring); 2728 pathbuf_destroy(pb); 2729 return (error); 2730 } 2731 2732 /* 2733 * Reposition read/write file offset. 2734 */ 2735 int 2736 sys_lseek(struct lwp *l, const struct sys_lseek_args *uap, register_t *retval) 2737 { 2738 /* { 2739 syscallarg(int) fd; 2740 syscallarg(int) pad; 2741 syscallarg(off_t) offset; 2742 syscallarg(int) whence; 2743 } */ 2744 kauth_cred_t cred = l->l_cred; 2745 file_t *fp; 2746 struct vnode *vp; 2747 struct vattr vattr; 2748 off_t newoff; 2749 int error, fd; 2750 2751 fd = SCARG(uap, fd); 2752 2753 if ((fp = fd_getfile(fd)) == NULL) 2754 return (EBADF); 2755 2756 vp = fp->f_vnode; 2757 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2758 error = ESPIPE; 2759 goto out; 2760 } 2761 2762 vn_lock(vp, LK_SHARED | LK_RETRY); 2763 2764 switch (SCARG(uap, whence)) { 2765 case SEEK_CUR: 2766 newoff = fp->f_offset + SCARG(uap, offset); 2767 break; 2768 case SEEK_END: 2769 error = VOP_GETATTR(vp, &vattr, cred); 2770 if (error) { 2771 VOP_UNLOCK(vp); 2772 goto out; 2773 } 2774 newoff = SCARG(uap, offset) + vattr.va_size; 2775 break; 2776 case SEEK_SET: 2777 newoff = SCARG(uap, offset); 2778 break; 2779 default: 2780 error = EINVAL; 2781 VOP_UNLOCK(vp); 2782 goto out; 2783 } 2784 VOP_UNLOCK(vp); 2785 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) == 0) { 2786 *(off_t *)retval = fp->f_offset = newoff; 2787 } 2788 out: 2789 fd_putfile(fd); 2790 return (error); 2791 } 2792 2793 /* 2794 * Positional read system call. 2795 */ 2796 int 2797 sys_pread(struct lwp *l, const struct sys_pread_args *uap, register_t *retval) 2798 { 2799 /* { 2800 syscallarg(int) fd; 2801 syscallarg(void *) buf; 2802 syscallarg(size_t) nbyte; 2803 syscallarg(off_t) offset; 2804 } */ 2805 file_t *fp; 2806 struct vnode *vp; 2807 off_t offset; 2808 int error, fd = SCARG(uap, fd); 2809 2810 if ((fp = fd_getfile(fd)) == NULL) 2811 return (EBADF); 2812 2813 if ((fp->f_flag & FREAD) == 0) { 2814 fd_putfile(fd); 2815 return (EBADF); 2816 } 2817 2818 vp = fp->f_vnode; 2819 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2820 error = ESPIPE; 2821 goto out; 2822 } 2823 2824 offset = SCARG(uap, offset); 2825 2826 /* 2827 * XXX This works because no file systems actually 2828 * XXX take any action on the seek operation. 2829 */ 2830 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2831 goto out; 2832 2833 /* dofileread() will unuse the descriptor for us */ 2834 return (dofileread(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2835 &offset, 0, retval)); 2836 2837 out: 2838 fd_putfile(fd); 2839 return (error); 2840 } 2841 2842 /* 2843 * Positional scatter read system call. 2844 */ 2845 int 2846 sys_preadv(struct lwp *l, const struct sys_preadv_args *uap, register_t *retval) 2847 { 2848 /* { 2849 syscallarg(int) fd; 2850 syscallarg(const struct iovec *) iovp; 2851 syscallarg(int) iovcnt; 2852 syscallarg(off_t) offset; 2853 } */ 2854 off_t offset = SCARG(uap, offset); 2855 2856 return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp), 2857 SCARG(uap, iovcnt), &offset, 0, retval); 2858 } 2859 2860 /* 2861 * Positional write system call. 2862 */ 2863 int 2864 sys_pwrite(struct lwp *l, const struct sys_pwrite_args *uap, register_t *retval) 2865 { 2866 /* { 2867 syscallarg(int) fd; 2868 syscallarg(const void *) buf; 2869 syscallarg(size_t) nbyte; 2870 syscallarg(off_t) offset; 2871 } */ 2872 file_t *fp; 2873 struct vnode *vp; 2874 off_t offset; 2875 int error, fd = SCARG(uap, fd); 2876 2877 if ((fp = fd_getfile(fd)) == NULL) 2878 return (EBADF); 2879 2880 if ((fp->f_flag & FWRITE) == 0) { 2881 fd_putfile(fd); 2882 return (EBADF); 2883 } 2884 2885 vp = fp->f_vnode; 2886 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2887 error = ESPIPE; 2888 goto out; 2889 } 2890 2891 offset = SCARG(uap, offset); 2892 2893 /* 2894 * XXX This works because no file systems actually 2895 * XXX take any action on the seek operation. 2896 */ 2897 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2898 goto out; 2899 2900 /* dofilewrite() will unuse the descriptor for us */ 2901 return (dofilewrite(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2902 &offset, 0, retval)); 2903 2904 out: 2905 fd_putfile(fd); 2906 return (error); 2907 } 2908 2909 /* 2910 * Positional gather write system call. 2911 */ 2912 int 2913 sys_pwritev(struct lwp *l, const struct sys_pwritev_args *uap, register_t *retval) 2914 { 2915 /* { 2916 syscallarg(int) fd; 2917 syscallarg(const struct iovec *) iovp; 2918 syscallarg(int) iovcnt; 2919 syscallarg(off_t) offset; 2920 } */ 2921 off_t offset = SCARG(uap, offset); 2922 2923 return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp), 2924 SCARG(uap, iovcnt), &offset, 0, retval); 2925 } 2926 2927 /* 2928 * Check access permissions. 2929 */ 2930 int 2931 sys_access(struct lwp *l, const struct sys_access_args *uap, register_t *retval) 2932 { 2933 /* { 2934 syscallarg(const char *) path; 2935 syscallarg(int) flags; 2936 } */ 2937 2938 return do_sys_accessat(l, AT_FDCWD, SCARG(uap, path), 2939 SCARG(uap, flags), 0); 2940 } 2941 2942 int 2943 do_sys_accessat(struct lwp *l, int fdat, const char *path, 2944 int mode, int flags) 2945 { 2946 kauth_cred_t cred; 2947 struct vnode *vp; 2948 int error, nd_flag, vmode; 2949 struct pathbuf *pb; 2950 struct nameidata nd; 2951 2952 CTASSERT(F_OK == 0); 2953 if ((mode & ~(R_OK | W_OK | X_OK)) != 0) { 2954 /* nonsense mode */ 2955 return EINVAL; 2956 } 2957 2958 nd_flag = FOLLOW | LOCKLEAF | TRYEMULROOT; 2959 if (flags & AT_SYMLINK_NOFOLLOW) 2960 nd_flag &= ~FOLLOW; 2961 2962 error = pathbuf_copyin(path, &pb); 2963 if (error) 2964 return error; 2965 2966 NDINIT(&nd, LOOKUP, nd_flag, pb); 2967 2968 /* Override default credentials */ 2969 cred = kauth_cred_dup(l->l_cred); 2970 if (!(flags & AT_EACCESS)) { 2971 kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); 2972 kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); 2973 } 2974 nd.ni_cnd.cn_cred = cred; 2975 2976 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 2977 pathbuf_destroy(pb); 2978 goto out; 2979 } 2980 vp = nd.ni_vp; 2981 pathbuf_destroy(pb); 2982 2983 /* Flags == 0 means only check for existence. */ 2984 if (mode) { 2985 vmode = 0; 2986 if (mode & R_OK) 2987 vmode |= VREAD; 2988 if (mode & W_OK) 2989 vmode |= VWRITE; 2990 if (mode & X_OK) 2991 vmode |= VEXEC; 2992 2993 error = VOP_ACCESS(vp, vmode, cred); 2994 if (!error && (vmode & VWRITE)) 2995 error = vn_writechk(vp); 2996 } 2997 vput(vp); 2998 out: 2999 kauth_cred_free(cred); 3000 return (error); 3001 } 3002 3003 int 3004 sys_faccessat(struct lwp *l, const struct sys_faccessat_args *uap, 3005 register_t *retval) 3006 { 3007 /* { 3008 syscallarg(int) fd; 3009 syscallarg(const char *) path; 3010 syscallarg(int) amode; 3011 syscallarg(int) flag; 3012 } */ 3013 3014 return do_sys_accessat(l, SCARG(uap, fd), SCARG(uap, path), 3015 SCARG(uap, amode), SCARG(uap, flag)); 3016 } 3017 3018 /* 3019 * Common code for all sys_stat functions, including compat versions. 3020 */ 3021 int 3022 do_sys_stat(const char *userpath, unsigned int nd_flag, 3023 struct stat *sb) 3024 { 3025 return do_sys_statat(NULL, AT_FDCWD, userpath, nd_flag, sb); 3026 } 3027 3028 int 3029 do_sys_statat(struct lwp *l, int fdat, const char *userpath, 3030 unsigned int nd_flag, struct stat *sb) 3031 { 3032 int error; 3033 struct pathbuf *pb; 3034 struct nameidata nd; 3035 3036 KASSERT(l != NULL || fdat == AT_FDCWD); 3037 3038 error = pathbuf_copyin(userpath, &pb); 3039 if (error) { 3040 return error; 3041 } 3042 3043 NDINIT(&nd, LOOKUP, nd_flag | LOCKLEAF | TRYEMULROOT, pb); 3044 3045 error = fd_nameiat(l, fdat, &nd); 3046 if (error != 0) { 3047 pathbuf_destroy(pb); 3048 return error; 3049 } 3050 error = vn_stat(nd.ni_vp, sb); 3051 vput(nd.ni_vp); 3052 pathbuf_destroy(pb); 3053 return error; 3054 } 3055 3056 /* 3057 * Get file status; this version follows links. 3058 */ 3059 /* ARGSUSED */ 3060 int 3061 sys___stat50(struct lwp *l, const struct sys___stat50_args *uap, register_t *retval) 3062 { 3063 /* { 3064 syscallarg(const char *) path; 3065 syscallarg(struct stat *) ub; 3066 } */ 3067 struct stat sb; 3068 int error; 3069 3070 error = do_sys_statat(l, AT_FDCWD, SCARG(uap, path), FOLLOW, &sb); 3071 if (error) 3072 return error; 3073 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 3074 } 3075 3076 /* 3077 * Get file status; this version does not follow links. 3078 */ 3079 /* ARGSUSED */ 3080 int 3081 sys___lstat50(struct lwp *l, const struct sys___lstat50_args *uap, register_t *retval) 3082 { 3083 /* { 3084 syscallarg(const char *) path; 3085 syscallarg(struct stat *) ub; 3086 } */ 3087 struct stat sb; 3088 int error; 3089 3090 error = do_sys_statat(l, AT_FDCWD, SCARG(uap, path), NOFOLLOW, &sb); 3091 if (error) 3092 return error; 3093 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 3094 } 3095 3096 int 3097 sys_fstatat(struct lwp *l, const struct sys_fstatat_args *uap, 3098 register_t *retval) 3099 { 3100 /* { 3101 syscallarg(int) fd; 3102 syscallarg(const char *) path; 3103 syscallarg(struct stat *) buf; 3104 syscallarg(int) flag; 3105 } */ 3106 unsigned int nd_flag; 3107 struct stat sb; 3108 int error; 3109 3110 if (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) 3111 nd_flag = NOFOLLOW; 3112 else 3113 nd_flag = FOLLOW; 3114 3115 error = do_sys_statat(l, SCARG(uap, fd), SCARG(uap, path), nd_flag, 3116 &sb); 3117 if (error) 3118 return error; 3119 return copyout(&sb, SCARG(uap, buf), sizeof(sb)); 3120 } 3121 3122 /* 3123 * Get configurable pathname variables. 3124 */ 3125 /* ARGSUSED */ 3126 int 3127 sys_pathconf(struct lwp *l, const struct sys_pathconf_args *uap, register_t *retval) 3128 { 3129 /* { 3130 syscallarg(const char *) path; 3131 syscallarg(int) name; 3132 } */ 3133 int error; 3134 struct pathbuf *pb; 3135 struct nameidata nd; 3136 3137 error = pathbuf_copyin(SCARG(uap, path), &pb); 3138 if (error) { 3139 return error; 3140 } 3141 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 3142 if ((error = namei(&nd)) != 0) { 3143 pathbuf_destroy(pb); 3144 return (error); 3145 } 3146 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 3147 vput(nd.ni_vp); 3148 pathbuf_destroy(pb); 3149 return (error); 3150 } 3151 3152 /* 3153 * Return target name of a symbolic link. 3154 */ 3155 /* ARGSUSED */ 3156 int 3157 sys_readlink(struct lwp *l, const struct sys_readlink_args *uap, 3158 register_t *retval) 3159 { 3160 /* { 3161 syscallarg(const char *) path; 3162 syscallarg(char *) buf; 3163 syscallarg(size_t) count; 3164 } */ 3165 return do_sys_readlinkat(l, AT_FDCWD, SCARG(uap, path), 3166 SCARG(uap, buf), SCARG(uap, count), retval); 3167 } 3168 3169 static int 3170 do_sys_readlinkat(struct lwp *l, int fdat, const char *path, char *buf, 3171 size_t count, register_t *retval) 3172 { 3173 struct vnode *vp; 3174 struct iovec aiov; 3175 struct uio auio; 3176 int error; 3177 struct pathbuf *pb; 3178 struct nameidata nd; 3179 3180 error = pathbuf_copyin(path, &pb); 3181 if (error) { 3182 return error; 3183 } 3184 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, pb); 3185 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 3186 pathbuf_destroy(pb); 3187 return error; 3188 } 3189 vp = nd.ni_vp; 3190 pathbuf_destroy(pb); 3191 if (vp->v_type != VLNK) 3192 error = EINVAL; 3193 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 3194 (error = VOP_ACCESS(vp, VREAD, l->l_cred)) == 0) { 3195 aiov.iov_base = buf; 3196 aiov.iov_len = count; 3197 auio.uio_iov = &aiov; 3198 auio.uio_iovcnt = 1; 3199 auio.uio_offset = 0; 3200 auio.uio_rw = UIO_READ; 3201 KASSERT(l == curlwp); 3202 auio.uio_vmspace = l->l_proc->p_vmspace; 3203 auio.uio_resid = count; 3204 if ((error = VOP_READLINK(vp, &auio, l->l_cred)) == 0) 3205 *retval = count - auio.uio_resid; 3206 } 3207 vput(vp); 3208 return (error); 3209 } 3210 3211 int 3212 sys_readlinkat(struct lwp *l, const struct sys_readlinkat_args *uap, 3213 register_t *retval) 3214 { 3215 /* { 3216 syscallarg(int) fd; 3217 syscallarg(const char *) path; 3218 syscallarg(char *) buf; 3219 syscallarg(size_t) bufsize; 3220 } */ 3221 3222 return do_sys_readlinkat(l, SCARG(uap, fd), SCARG(uap, path), 3223 SCARG(uap, buf), SCARG(uap, bufsize), retval); 3224 } 3225 3226 /* 3227 * Change flags of a file given a path name. 3228 */ 3229 /* ARGSUSED */ 3230 int 3231 sys_chflags(struct lwp *l, const struct sys_chflags_args *uap, register_t *retval) 3232 { 3233 /* { 3234 syscallarg(const char *) path; 3235 syscallarg(u_long) flags; 3236 } */ 3237 struct vnode *vp; 3238 int error; 3239 3240 error = namei_simple_user(SCARG(uap, path), 3241 NSM_FOLLOW_TRYEMULROOT, &vp); 3242 if (error != 0) 3243 return (error); 3244 error = change_flags(vp, SCARG(uap, flags), l); 3245 vput(vp); 3246 return (error); 3247 } 3248 3249 /* 3250 * Change flags of a file given a file descriptor. 3251 */ 3252 /* ARGSUSED */ 3253 int 3254 sys_fchflags(struct lwp *l, const struct sys_fchflags_args *uap, register_t *retval) 3255 { 3256 /* { 3257 syscallarg(int) fd; 3258 syscallarg(u_long) flags; 3259 } */ 3260 struct vnode *vp; 3261 file_t *fp; 3262 int error; 3263 3264 /* fd_getvnode() will use the descriptor for us */ 3265 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3266 return (error); 3267 vp = fp->f_vnode; 3268 error = change_flags(vp, SCARG(uap, flags), l); 3269 VOP_UNLOCK(vp); 3270 fd_putfile(SCARG(uap, fd)); 3271 return (error); 3272 } 3273 3274 /* 3275 * Change flags of a file given a path name; this version does 3276 * not follow links. 3277 */ 3278 int 3279 sys_lchflags(struct lwp *l, const struct sys_lchflags_args *uap, register_t *retval) 3280 { 3281 /* { 3282 syscallarg(const char *) path; 3283 syscallarg(u_long) flags; 3284 } */ 3285 struct vnode *vp; 3286 int error; 3287 3288 error = namei_simple_user(SCARG(uap, path), 3289 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3290 if (error != 0) 3291 return (error); 3292 error = change_flags(vp, SCARG(uap, flags), l); 3293 vput(vp); 3294 return (error); 3295 } 3296 3297 /* 3298 * Common routine to change flags of a file. 3299 */ 3300 int 3301 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 3302 { 3303 struct vattr vattr; 3304 int error; 3305 3306 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3307 3308 vattr_null(&vattr); 3309 vattr.va_flags = flags; 3310 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3311 3312 return (error); 3313 } 3314 3315 /* 3316 * Change mode of a file given path name; this version follows links. 3317 */ 3318 /* ARGSUSED */ 3319 int 3320 sys_chmod(struct lwp *l, const struct sys_chmod_args *uap, register_t *retval) 3321 { 3322 /* { 3323 syscallarg(const char *) path; 3324 syscallarg(int) mode; 3325 } */ 3326 return do_sys_chmodat(l, AT_FDCWD, SCARG(uap, path), 3327 SCARG(uap, mode), 0); 3328 } 3329 3330 int 3331 do_sys_chmodat(struct lwp *l, int fdat, const char *path, int mode, int flags) 3332 { 3333 int error; 3334 struct vnode *vp; 3335 namei_simple_flags_t ns_flag; 3336 3337 if (flags & AT_SYMLINK_NOFOLLOW) 3338 ns_flag = NSM_NOFOLLOW_TRYEMULROOT; 3339 else 3340 ns_flag = NSM_FOLLOW_TRYEMULROOT; 3341 3342 error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp); 3343 if (error != 0) 3344 return error; 3345 3346 error = change_mode(vp, mode, l); 3347 3348 vrele(vp); 3349 3350 return (error); 3351 } 3352 3353 /* 3354 * Change mode of a file given a file descriptor. 3355 */ 3356 /* ARGSUSED */ 3357 int 3358 sys_fchmod(struct lwp *l, const struct sys_fchmod_args *uap, register_t *retval) 3359 { 3360 /* { 3361 syscallarg(int) fd; 3362 syscallarg(int) mode; 3363 } */ 3364 file_t *fp; 3365 int error; 3366 3367 /* fd_getvnode() will use the descriptor for us */ 3368 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3369 return (error); 3370 error = change_mode(fp->f_vnode, SCARG(uap, mode), l); 3371 fd_putfile(SCARG(uap, fd)); 3372 return (error); 3373 } 3374 3375 int 3376 sys_fchmodat(struct lwp *l, const struct sys_fchmodat_args *uap, 3377 register_t *retval) 3378 { 3379 /* { 3380 syscallarg(int) fd; 3381 syscallarg(const char *) path; 3382 syscallarg(int) mode; 3383 syscallarg(int) flag; 3384 } */ 3385 3386 return do_sys_chmodat(l, SCARG(uap, fd), SCARG(uap, path), 3387 SCARG(uap, mode), SCARG(uap, flag)); 3388 } 3389 3390 /* 3391 * Change mode of a file given path name; this version does not follow links. 3392 */ 3393 /* ARGSUSED */ 3394 int 3395 sys_lchmod(struct lwp *l, const struct sys_lchmod_args *uap, register_t *retval) 3396 { 3397 /* { 3398 syscallarg(const char *) path; 3399 syscallarg(int) mode; 3400 } */ 3401 int error; 3402 struct vnode *vp; 3403 3404 error = namei_simple_user(SCARG(uap, path), 3405 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3406 if (error != 0) 3407 return (error); 3408 3409 error = change_mode(vp, SCARG(uap, mode), l); 3410 3411 vrele(vp); 3412 return (error); 3413 } 3414 3415 /* 3416 * Common routine to set mode given a vnode. 3417 */ 3418 static int 3419 change_mode(struct vnode *vp, int mode, struct lwp *l) 3420 { 3421 struct vattr vattr; 3422 int error; 3423 3424 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3425 vattr_null(&vattr); 3426 vattr.va_mode = mode & ALLPERMS; 3427 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3428 VOP_UNLOCK(vp); 3429 return (error); 3430 } 3431 3432 /* 3433 * Set ownership given a path name; this version follows links. 3434 */ 3435 /* ARGSUSED */ 3436 int 3437 sys_chown(struct lwp *l, const struct sys_chown_args *uap, register_t *retval) 3438 { 3439 /* { 3440 syscallarg(const char *) path; 3441 syscallarg(uid_t) uid; 3442 syscallarg(gid_t) gid; 3443 } */ 3444 return do_sys_chownat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap,uid), 3445 SCARG(uap, gid), 0); 3446 } 3447 3448 int 3449 do_sys_chownat(struct lwp *l, int fdat, const char *path, uid_t uid, 3450 gid_t gid, int flags) 3451 { 3452 int error; 3453 struct vnode *vp; 3454 namei_simple_flags_t ns_flag; 3455 3456 if (flags & AT_SYMLINK_NOFOLLOW) 3457 ns_flag = NSM_NOFOLLOW_TRYEMULROOT; 3458 else 3459 ns_flag = NSM_FOLLOW_TRYEMULROOT; 3460 3461 error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp); 3462 if (error != 0) 3463 return error; 3464 3465 error = change_owner(vp, uid, gid, l, 0); 3466 3467 vrele(vp); 3468 3469 return (error); 3470 } 3471 3472 /* 3473 * Set ownership given a path name; this version follows links. 3474 * Provides POSIX semantics. 3475 */ 3476 /* ARGSUSED */ 3477 int 3478 sys___posix_chown(struct lwp *l, const struct sys___posix_chown_args *uap, register_t *retval) 3479 { 3480 /* { 3481 syscallarg(const char *) path; 3482 syscallarg(uid_t) uid; 3483 syscallarg(gid_t) gid; 3484 } */ 3485 int error; 3486 struct vnode *vp; 3487 3488 error = namei_simple_user(SCARG(uap, path), 3489 NSM_FOLLOW_TRYEMULROOT, &vp); 3490 if (error != 0) 3491 return (error); 3492 3493 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3494 3495 vrele(vp); 3496 return (error); 3497 } 3498 3499 /* 3500 * Set ownership given a file descriptor. 3501 */ 3502 /* ARGSUSED */ 3503 int 3504 sys_fchown(struct lwp *l, const struct sys_fchown_args *uap, register_t *retval) 3505 { 3506 /* { 3507 syscallarg(int) fd; 3508 syscallarg(uid_t) uid; 3509 syscallarg(gid_t) gid; 3510 } */ 3511 int error; 3512 file_t *fp; 3513 3514 /* fd_getvnode() will use the descriptor for us */ 3515 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3516 return (error); 3517 error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid), 3518 l, 0); 3519 fd_putfile(SCARG(uap, fd)); 3520 return (error); 3521 } 3522 3523 int 3524 sys_fchownat(struct lwp *l, const struct sys_fchownat_args *uap, 3525 register_t *retval) 3526 { 3527 /* { 3528 syscallarg(int) fd; 3529 syscallarg(const char *) path; 3530 syscallarg(uid_t) owner; 3531 syscallarg(gid_t) group; 3532 syscallarg(int) flag; 3533 } */ 3534 3535 return do_sys_chownat(l, SCARG(uap, fd), SCARG(uap, path), 3536 SCARG(uap, owner), SCARG(uap, group), 3537 SCARG(uap, flag)); 3538 } 3539 3540 /* 3541 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 3542 */ 3543 /* ARGSUSED */ 3544 int 3545 sys___posix_fchown(struct lwp *l, const struct sys___posix_fchown_args *uap, register_t *retval) 3546 { 3547 /* { 3548 syscallarg(int) fd; 3549 syscallarg(uid_t) uid; 3550 syscallarg(gid_t) gid; 3551 } */ 3552 int error; 3553 file_t *fp; 3554 3555 /* fd_getvnode() will use the descriptor for us */ 3556 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3557 return (error); 3558 error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid), 3559 l, 1); 3560 fd_putfile(SCARG(uap, fd)); 3561 return (error); 3562 } 3563 3564 /* 3565 * Set ownership given a path name; this version does not follow links. 3566 */ 3567 /* ARGSUSED */ 3568 int 3569 sys_lchown(struct lwp *l, const struct sys_lchown_args *uap, register_t *retval) 3570 { 3571 /* { 3572 syscallarg(const char *) path; 3573 syscallarg(uid_t) uid; 3574 syscallarg(gid_t) gid; 3575 } */ 3576 int error; 3577 struct vnode *vp; 3578 3579 error = namei_simple_user(SCARG(uap, path), 3580 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3581 if (error != 0) 3582 return (error); 3583 3584 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 3585 3586 vrele(vp); 3587 return (error); 3588 } 3589 3590 /* 3591 * Set ownership given a path name; this version does not follow links. 3592 * Provides POSIX/XPG semantics. 3593 */ 3594 /* ARGSUSED */ 3595 int 3596 sys___posix_lchown(struct lwp *l, const struct sys___posix_lchown_args *uap, register_t *retval) 3597 { 3598 /* { 3599 syscallarg(const char *) path; 3600 syscallarg(uid_t) uid; 3601 syscallarg(gid_t) gid; 3602 } */ 3603 int error; 3604 struct vnode *vp; 3605 3606 error = namei_simple_user(SCARG(uap, path), 3607 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3608 if (error != 0) 3609 return (error); 3610 3611 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3612 3613 vrele(vp); 3614 return (error); 3615 } 3616 3617 /* 3618 * Common routine to set ownership given a vnode. 3619 */ 3620 static int 3621 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 3622 int posix_semantics) 3623 { 3624 struct vattr vattr; 3625 mode_t newmode; 3626 int error; 3627 3628 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3629 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) 3630 goto out; 3631 3632 #define CHANGED(x) ((int)(x) != -1) 3633 newmode = vattr.va_mode; 3634 if (posix_semantics) { 3635 /* 3636 * POSIX/XPG semantics: if the caller is not the super-user, 3637 * clear set-user-id and set-group-id bits. Both POSIX and 3638 * the XPG consider the behaviour for calls by the super-user 3639 * implementation-defined; we leave the set-user-id and set- 3640 * group-id settings intact in that case. 3641 */ 3642 if (vattr.va_mode & S_ISUID) { 3643 if (kauth_authorize_vnode(l->l_cred, 3644 KAUTH_VNODE_RETAIN_SUID, vp, NULL, EPERM) != 0) 3645 newmode &= ~S_ISUID; 3646 } 3647 if (vattr.va_mode & S_ISGID) { 3648 if (kauth_authorize_vnode(l->l_cred, 3649 KAUTH_VNODE_RETAIN_SGID, vp, NULL, EPERM) != 0) 3650 newmode &= ~S_ISGID; 3651 } 3652 } else { 3653 /* 3654 * NetBSD semantics: when changing owner and/or group, 3655 * clear the respective bit(s). 3656 */ 3657 if (CHANGED(uid)) 3658 newmode &= ~S_ISUID; 3659 if (CHANGED(gid)) 3660 newmode &= ~S_ISGID; 3661 } 3662 /* Update va_mode iff altered. */ 3663 if (vattr.va_mode == newmode) 3664 newmode = VNOVAL; 3665 3666 vattr_null(&vattr); 3667 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 3668 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 3669 vattr.va_mode = newmode; 3670 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3671 #undef CHANGED 3672 3673 out: 3674 VOP_UNLOCK(vp); 3675 return (error); 3676 } 3677 3678 /* 3679 * Set the access and modification times given a path name; this 3680 * version follows links. 3681 */ 3682 /* ARGSUSED */ 3683 int 3684 sys___utimes50(struct lwp *l, const struct sys___utimes50_args *uap, 3685 register_t *retval) 3686 { 3687 /* { 3688 syscallarg(const char *) path; 3689 syscallarg(const struct timeval *) tptr; 3690 } */ 3691 3692 return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, 3693 SCARG(uap, tptr), UIO_USERSPACE); 3694 } 3695 3696 /* 3697 * Set the access and modification times given a file descriptor. 3698 */ 3699 /* ARGSUSED */ 3700 int 3701 sys___futimes50(struct lwp *l, const struct sys___futimes50_args *uap, 3702 register_t *retval) 3703 { 3704 /* { 3705 syscallarg(int) fd; 3706 syscallarg(const struct timeval *) tptr; 3707 } */ 3708 int error; 3709 file_t *fp; 3710 3711 /* fd_getvnode() will use the descriptor for us */ 3712 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3713 return (error); 3714 error = do_sys_utimes(l, fp->f_vnode, NULL, 0, SCARG(uap, tptr), 3715 UIO_USERSPACE); 3716 fd_putfile(SCARG(uap, fd)); 3717 return (error); 3718 } 3719 3720 int 3721 sys_futimens(struct lwp *l, const struct sys_futimens_args *uap, 3722 register_t *retval) 3723 { 3724 /* { 3725 syscallarg(int) fd; 3726 syscallarg(const struct timespec *) tptr; 3727 } */ 3728 int error; 3729 file_t *fp; 3730 3731 /* fd_getvnode() will use the descriptor for us */ 3732 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3733 return (error); 3734 error = do_sys_utimensat(l, AT_FDCWD, fp->f_vnode, NULL, 0, 3735 SCARG(uap, tptr), UIO_USERSPACE); 3736 fd_putfile(SCARG(uap, fd)); 3737 return (error); 3738 } 3739 3740 /* 3741 * Set the access and modification times given a path name; this 3742 * version does not follow links. 3743 */ 3744 int 3745 sys___lutimes50(struct lwp *l, const struct sys___lutimes50_args *uap, 3746 register_t *retval) 3747 { 3748 /* { 3749 syscallarg(const char *) path; 3750 syscallarg(const struct timeval *) tptr; 3751 } */ 3752 3753 return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW, 3754 SCARG(uap, tptr), UIO_USERSPACE); 3755 } 3756 3757 int 3758 sys_utimensat(struct lwp *l, const struct sys_utimensat_args *uap, 3759 register_t *retval) 3760 { 3761 /* { 3762 syscallarg(int) fd; 3763 syscallarg(const char *) path; 3764 syscallarg(const struct timespec *) tptr; 3765 syscallarg(int) flag; 3766 } */ 3767 int follow; 3768 const struct timespec *tptr; 3769 int error; 3770 3771 tptr = SCARG(uap, tptr); 3772 follow = (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 3773 3774 error = do_sys_utimensat(l, SCARG(uap, fd), NULL, 3775 SCARG(uap, path), follow, tptr, UIO_USERSPACE); 3776 3777 return error; 3778 } 3779 3780 /* 3781 * Common routine to set access and modification times given a vnode. 3782 */ 3783 int 3784 do_sys_utimens(struct lwp *l, struct vnode *vp, const char *path, int flag, 3785 const struct timespec *tptr, enum uio_seg seg) 3786 { 3787 return do_sys_utimensat(l, AT_FDCWD, vp, path, flag, tptr, seg); 3788 } 3789 3790 int 3791 do_sys_utimensat(struct lwp *l, int fdat, struct vnode *vp, 3792 const char *path, int flag, const struct timespec *tptr, enum uio_seg seg) 3793 { 3794 struct vattr vattr; 3795 int error, dorele = 0; 3796 namei_simple_flags_t sflags; 3797 bool vanull, setbirthtime; 3798 struct timespec ts[2]; 3799 3800 KASSERT(l != NULL || fdat == AT_FDCWD); 3801 3802 /* 3803 * I have checked all callers and they pass either FOLLOW, 3804 * NOFOLLOW, or 0 (when they don't pass a path), and NOFOLLOW 3805 * is 0. More to the point, they don't pass anything else. 3806 * Let's keep it that way at least until the namei interfaces 3807 * are fully sanitized. 3808 */ 3809 KASSERT(flag == NOFOLLOW || flag == FOLLOW); 3810 sflags = (flag == FOLLOW) ? 3811 NSM_FOLLOW_TRYEMULROOT : NSM_NOFOLLOW_TRYEMULROOT; 3812 3813 if (tptr == NULL) { 3814 vanull = true; 3815 nanotime(&ts[0]); 3816 ts[1] = ts[0]; 3817 } else { 3818 vanull = false; 3819 if (seg != UIO_SYSSPACE) { 3820 error = copyin(tptr, ts, sizeof (ts)); 3821 if (error != 0) 3822 return error; 3823 } else { 3824 ts[0] = tptr[0]; 3825 ts[1] = tptr[1]; 3826 } 3827 } 3828 3829 if (ts[0].tv_nsec == UTIME_NOW) { 3830 nanotime(&ts[0]); 3831 if (ts[1].tv_nsec == UTIME_NOW) { 3832 vanull = true; 3833 ts[1] = ts[0]; 3834 } 3835 } else if (ts[1].tv_nsec == UTIME_NOW) 3836 nanotime(&ts[1]); 3837 3838 if (vp == NULL) { 3839 /* note: SEG describes TPTR, not PATH; PATH is always user */ 3840 error = fd_nameiat_simple_user(l, fdat, path, sflags, &vp); 3841 if (error != 0) 3842 return error; 3843 dorele = 1; 3844 } 3845 3846 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3847 setbirthtime = (VOP_GETATTR(vp, &vattr, l->l_cred) == 0 && 3848 timespeccmp(&ts[1], &vattr.va_birthtime, <)); 3849 vattr_null(&vattr); 3850 3851 if (ts[0].tv_nsec != UTIME_OMIT) 3852 vattr.va_atime = ts[0]; 3853 3854 if (ts[1].tv_nsec != UTIME_OMIT) { 3855 vattr.va_mtime = ts[1]; 3856 if (setbirthtime) 3857 vattr.va_birthtime = ts[1]; 3858 } 3859 3860 if (vanull) 3861 vattr.va_vaflags |= VA_UTIMES_NULL; 3862 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3863 VOP_UNLOCK(vp); 3864 3865 if (dorele != 0) 3866 vrele(vp); 3867 3868 return error; 3869 } 3870 3871 int 3872 do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag, 3873 const struct timeval *tptr, enum uio_seg seg) 3874 { 3875 struct timespec ts[2]; 3876 struct timespec *tsptr = NULL; 3877 int error; 3878 3879 if (tptr != NULL) { 3880 struct timeval tv[2]; 3881 3882 if (seg != UIO_SYSSPACE) { 3883 error = copyin(tptr, tv, sizeof (tv)); 3884 if (error != 0) 3885 return error; 3886 tptr = tv; 3887 } 3888 3889 if ((tv[0].tv_usec == UTIME_NOW) || 3890 (tv[0].tv_usec == UTIME_OMIT)) 3891 ts[0].tv_nsec = tv[0].tv_usec; 3892 else 3893 TIMEVAL_TO_TIMESPEC(&tptr[0], &ts[0]); 3894 3895 if ((tv[1].tv_usec == UTIME_NOW) || 3896 (tv[1].tv_usec == UTIME_OMIT)) 3897 ts[1].tv_nsec = tv[1].tv_usec; 3898 else 3899 TIMEVAL_TO_TIMESPEC(&tptr[1], &ts[1]); 3900 3901 tsptr = &ts[0]; 3902 } 3903 3904 return do_sys_utimens(l, vp, path, flag, tsptr, UIO_SYSSPACE); 3905 } 3906 3907 /* 3908 * Truncate a file given its path name. 3909 */ 3910 /* ARGSUSED */ 3911 int 3912 sys_truncate(struct lwp *l, const struct sys_truncate_args *uap, register_t *retval) 3913 { 3914 /* { 3915 syscallarg(const char *) path; 3916 syscallarg(int) pad; 3917 syscallarg(off_t) length; 3918 } */ 3919 struct vnode *vp; 3920 struct vattr vattr; 3921 int error; 3922 3923 if (SCARG(uap, length) < 0) 3924 return EINVAL; 3925 3926 error = namei_simple_user(SCARG(uap, path), 3927 NSM_FOLLOW_TRYEMULROOT, &vp); 3928 if (error != 0) 3929 return (error); 3930 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3931 if (vp->v_type == VDIR) 3932 error = EISDIR; 3933 else if ((error = vn_writechk(vp)) == 0 && 3934 (error = VOP_ACCESS(vp, VWRITE, l->l_cred)) == 0) { 3935 vattr_null(&vattr); 3936 vattr.va_size = SCARG(uap, length); 3937 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3938 } 3939 vput(vp); 3940 return (error); 3941 } 3942 3943 /* 3944 * Truncate a file given a file descriptor. 3945 */ 3946 /* ARGSUSED */ 3947 int 3948 sys_ftruncate(struct lwp *l, const struct sys_ftruncate_args *uap, register_t *retval) 3949 { 3950 /* { 3951 syscallarg(int) fd; 3952 syscallarg(int) pad; 3953 syscallarg(off_t) length; 3954 } */ 3955 struct vattr vattr; 3956 struct vnode *vp; 3957 file_t *fp; 3958 int error; 3959 3960 if (SCARG(uap, length) < 0) 3961 return EINVAL; 3962 3963 /* fd_getvnode() will use the descriptor for us */ 3964 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3965 return (error); 3966 if ((fp->f_flag & FWRITE) == 0) { 3967 error = EINVAL; 3968 goto out; 3969 } 3970 vp = fp->f_vnode; 3971 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3972 if (vp->v_type == VDIR) 3973 error = EISDIR; 3974 else if ((error = vn_writechk(vp)) == 0) { 3975 vattr_null(&vattr); 3976 vattr.va_size = SCARG(uap, length); 3977 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 3978 } 3979 VOP_UNLOCK(vp); 3980 out: 3981 fd_putfile(SCARG(uap, fd)); 3982 return (error); 3983 } 3984 3985 /* 3986 * Sync an open file. 3987 */ 3988 /* ARGSUSED */ 3989 int 3990 sys_fsync(struct lwp *l, const struct sys_fsync_args *uap, register_t *retval) 3991 { 3992 /* { 3993 syscallarg(int) fd; 3994 } */ 3995 struct vnode *vp; 3996 file_t *fp; 3997 int error; 3998 3999 /* fd_getvnode() will use the descriptor for us */ 4000 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4001 return (error); 4002 vp = fp->f_vnode; 4003 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4004 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0); 4005 VOP_UNLOCK(vp); 4006 fd_putfile(SCARG(uap, fd)); 4007 return (error); 4008 } 4009 4010 /* 4011 * Sync a range of file data. API modeled after that found in AIX. 4012 * 4013 * FDATASYNC indicates that we need only save enough metadata to be able 4014 * to re-read the written data. Note we duplicate AIX's requirement that 4015 * the file be open for writing. 4016 */ 4017 /* ARGSUSED */ 4018 int 4019 sys_fsync_range(struct lwp *l, const struct sys_fsync_range_args *uap, register_t *retval) 4020 { 4021 /* { 4022 syscallarg(int) fd; 4023 syscallarg(int) flags; 4024 syscallarg(off_t) start; 4025 syscallarg(off_t) length; 4026 } */ 4027 struct vnode *vp; 4028 file_t *fp; 4029 int flags, nflags; 4030 off_t s, e, len; 4031 int error; 4032 4033 /* fd_getvnode() will use the descriptor for us */ 4034 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4035 return (error); 4036 4037 if ((fp->f_flag & FWRITE) == 0) { 4038 error = EBADF; 4039 goto out; 4040 } 4041 4042 flags = SCARG(uap, flags); 4043 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 4044 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 4045 error = EINVAL; 4046 goto out; 4047 } 4048 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 4049 if (flags & FDATASYNC) 4050 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 4051 else 4052 nflags = FSYNC_WAIT; 4053 if (flags & FDISKSYNC) 4054 nflags |= FSYNC_CACHE; 4055 4056 len = SCARG(uap, length); 4057 /* If length == 0, we do the whole file, and s = e = 0 will do that */ 4058 if (len) { 4059 s = SCARG(uap, start); 4060 e = s + len; 4061 if (e < s) { 4062 error = EINVAL; 4063 goto out; 4064 } 4065 } else { 4066 e = 0; 4067 s = 0; 4068 } 4069 4070 vp = fp->f_vnode; 4071 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4072 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e); 4073 VOP_UNLOCK(vp); 4074 out: 4075 fd_putfile(SCARG(uap, fd)); 4076 return (error); 4077 } 4078 4079 /* 4080 * Sync the data of an open file. 4081 */ 4082 /* ARGSUSED */ 4083 int 4084 sys_fdatasync(struct lwp *l, const struct sys_fdatasync_args *uap, register_t *retval) 4085 { 4086 /* { 4087 syscallarg(int) fd; 4088 } */ 4089 struct vnode *vp; 4090 file_t *fp; 4091 int error; 4092 4093 /* fd_getvnode() will use the descriptor for us */ 4094 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4095 return (error); 4096 if ((fp->f_flag & FWRITE) == 0) { 4097 fd_putfile(SCARG(uap, fd)); 4098 return (EBADF); 4099 } 4100 vp = fp->f_vnode; 4101 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4102 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0); 4103 VOP_UNLOCK(vp); 4104 fd_putfile(SCARG(uap, fd)); 4105 return (error); 4106 } 4107 4108 /* 4109 * Rename files, (standard) BSD semantics frontend. 4110 */ 4111 /* ARGSUSED */ 4112 int 4113 sys_rename(struct lwp *l, const struct sys_rename_args *uap, register_t *retval) 4114 { 4115 /* { 4116 syscallarg(const char *) from; 4117 syscallarg(const char *) to; 4118 } */ 4119 4120 return (do_sys_renameat(l, AT_FDCWD, SCARG(uap, from), AT_FDCWD, 4121 SCARG(uap, to), UIO_USERSPACE, 0)); 4122 } 4123 4124 int 4125 sys_renameat(struct lwp *l, const struct sys_renameat_args *uap, 4126 register_t *retval) 4127 { 4128 /* { 4129 syscallarg(int) fromfd; 4130 syscallarg(const char *) from; 4131 syscallarg(int) tofd; 4132 syscallarg(const char *) to; 4133 } */ 4134 4135 return (do_sys_renameat(l, SCARG(uap, fromfd), SCARG(uap, from), 4136 SCARG(uap, tofd), SCARG(uap, to), UIO_USERSPACE, 0)); 4137 } 4138 4139 /* 4140 * Rename files, POSIX semantics frontend. 4141 */ 4142 /* ARGSUSED */ 4143 int 4144 sys___posix_rename(struct lwp *l, const struct sys___posix_rename_args *uap, register_t *retval) 4145 { 4146 /* { 4147 syscallarg(const char *) from; 4148 syscallarg(const char *) to; 4149 } */ 4150 4151 return (do_sys_renameat(l, AT_FDCWD, SCARG(uap, from), AT_FDCWD, 4152 SCARG(uap, to), UIO_USERSPACE, 1)); 4153 } 4154 4155 /* 4156 * Rename files. Source and destination must either both be directories, 4157 * or both not be directories. If target is a directory, it must be empty. 4158 * If `from' and `to' refer to the same object, the value of the `retain' 4159 * argument is used to determine whether `from' will be 4160 * 4161 * (retain == 0) deleted unless `from' and `to' refer to the same 4162 * object in the file system's name space (BSD). 4163 * (retain == 1) always retained (POSIX). 4164 * 4165 * XXX Synchronize with nfsrv_rename in nfs_serv.c. 4166 */ 4167 int 4168 do_sys_rename(const char *from, const char *to, enum uio_seg seg, int retain) 4169 { 4170 return do_sys_renameat(NULL, AT_FDCWD, from, AT_FDCWD, to, seg, retain); 4171 } 4172 4173 static int 4174 do_sys_renameat(struct lwp *l, int fromfd, const char *from, int tofd, 4175 const char *to, enum uio_seg seg, int retain) 4176 { 4177 struct pathbuf *fpb, *tpb; 4178 struct nameidata fnd, tnd; 4179 struct vnode *fdvp, *fvp; 4180 struct vnode *tdvp, *tvp; 4181 struct mount *mp, *tmp; 4182 int error; 4183 4184 KASSERT(l != NULL || (fromfd == AT_FDCWD && tofd == AT_FDCWD)); 4185 4186 error = pathbuf_maybe_copyin(from, seg, &fpb); 4187 if (error) 4188 goto out0; 4189 KASSERT(fpb != NULL); 4190 4191 error = pathbuf_maybe_copyin(to, seg, &tpb); 4192 if (error) 4193 goto out1; 4194 KASSERT(tpb != NULL); 4195 4196 /* 4197 * Lookup from. 4198 * 4199 * XXX LOCKPARENT is wrong because we don't actually want it 4200 * locked yet, but (a) namei is insane, and (b) VOP_RENAME is 4201 * insane, so for the time being we need to leave it like this. 4202 */ 4203 NDINIT(&fnd, DELETE, (LOCKPARENT | TRYEMULROOT), fpb); 4204 if ((error = fd_nameiat(l, fromfd, &fnd)) != 0) 4205 goto out2; 4206 4207 /* 4208 * Pull out the important results of the lookup, fdvp and fvp. 4209 * Of course, fvp is bogus because we're about to unlock fdvp. 4210 */ 4211 fdvp = fnd.ni_dvp; 4212 fvp = fnd.ni_vp; 4213 KASSERT(fdvp != NULL); 4214 KASSERT(fvp != NULL); 4215 KASSERT((fdvp == fvp) || (VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE)); 4216 4217 /* 4218 * Make sure neither fdvp nor fvp is locked. 4219 */ 4220 if (fdvp != fvp) 4221 VOP_UNLOCK(fdvp); 4222 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4223 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4224 4225 /* 4226 * Reject renaming `.' and `..'. Can't do this until after 4227 * namei because we need namei's parsing to find the final 4228 * component name. (namei should just leave us with the final 4229 * component name and not look it up itself, but anyway...) 4230 * 4231 * This was here before because we used to relookup from 4232 * instead of to and relookup requires the caller to check 4233 * this, but now file systems may depend on this check, so we 4234 * must retain it until the file systems are all rototilled. 4235 */ 4236 if (((fnd.ni_cnd.cn_namelen == 1) && 4237 (fnd.ni_cnd.cn_nameptr[0] == '.')) || 4238 ((fnd.ni_cnd.cn_namelen == 2) && 4239 (fnd.ni_cnd.cn_nameptr[0] == '.') && 4240 (fnd.ni_cnd.cn_nameptr[1] == '.'))) { 4241 error = EINVAL; /* XXX EISDIR? */ 4242 goto abort0; 4243 } 4244 4245 /* 4246 * Lookup to. 4247 * 4248 * XXX LOCKPARENT is wrong, but...insanity, &c. Also, using 4249 * fvp here to decide whether to add CREATEDIR is a load of 4250 * bollocks because fvp might be the wrong node by now, since 4251 * fdvp is unlocked. 4252 * 4253 * XXX Why not pass CREATEDIR always? 4254 */ 4255 NDINIT(&tnd, RENAME, 4256 (LOCKPARENT | NOCACHE | TRYEMULROOT | 4257 ((fvp->v_type == VDIR)? CREATEDIR : 0)), 4258 tpb); 4259 if ((error = fd_nameiat(l, tofd, &tnd)) != 0) 4260 goto abort0; 4261 4262 /* 4263 * Pull out the important results of the lookup, tdvp and tvp. 4264 * Of course, tvp is bogus because we're about to unlock tdvp. 4265 */ 4266 tdvp = tnd.ni_dvp; 4267 tvp = tnd.ni_vp; 4268 KASSERT(tdvp != NULL); 4269 KASSERT((tdvp == tvp) || (VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE)); 4270 4271 /* 4272 * Make sure neither tdvp nor tvp is locked. 4273 */ 4274 if (tdvp != tvp) 4275 VOP_UNLOCK(tdvp); 4276 /* XXX KASSERT(VOP_ISLOCKED(tdvp) != LK_EXCLUSIVE); */ 4277 /* XXX KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) != LK_EXCLUSIVE)); */ 4278 4279 /* 4280 * Reject renaming onto `.' or `..'. relookup is unhappy with 4281 * these, which is why we must do this here. Once upon a time 4282 * we relooked up from instead of to, and consequently didn't 4283 * need this check, but now that we relookup to instead of 4284 * from, we need this; and we shall need it forever forward 4285 * until the VOP_RENAME protocol changes, because file systems 4286 * will no doubt begin to depend on this check. 4287 */ 4288 if ((tnd.ni_cnd.cn_namelen == 1) && (tnd.ni_cnd.cn_nameptr[0] == '.')) { 4289 error = EISDIR; 4290 goto abort1; 4291 } 4292 if ((tnd.ni_cnd.cn_namelen == 2) && 4293 (tnd.ni_cnd.cn_nameptr[0] == '.') && 4294 (tnd.ni_cnd.cn_nameptr[1] == '.')) { 4295 error = EINVAL; 4296 goto abort1; 4297 } 4298 4299 /* 4300 * Get the mount point. If the file system has been unmounted, 4301 * which it may be because we're not holding any vnode locks, 4302 * then v_mount will be NULL. We're not really supposed to 4303 * read v_mount without holding the vnode lock, but since we 4304 * have fdvp referenced, if fdvp->v_mount changes then at worst 4305 * it will be set to NULL, not changed to another mount point. 4306 * And, of course, since it is up to the file system to 4307 * determine the real lock order, we can't lock both fdvp and 4308 * tdvp at the same time. 4309 */ 4310 mp = fdvp->v_mount; 4311 if (mp == NULL) { 4312 error = ENOENT; 4313 goto abort1; 4314 } 4315 4316 /* 4317 * Make sure the mount points match. Again, although we don't 4318 * hold any vnode locks, the v_mount fields may change -- but 4319 * at worst they will change to NULL, so this will never become 4320 * a cross-device rename, because we hold vnode references. 4321 * 4322 * XXX Because nothing is locked and the compiler may reorder 4323 * things here, unmounting the file system at an inopportune 4324 * moment may cause rename to fail with EXDEV when it really 4325 * should fail with ENOENT. 4326 */ 4327 tmp = tdvp->v_mount; 4328 if (tmp == NULL) { 4329 error = ENOENT; 4330 goto abort1; 4331 } 4332 4333 if (mp != tmp) { 4334 error = EXDEV; 4335 goto abort1; 4336 } 4337 4338 /* 4339 * Take the vfs rename lock to avoid cross-directory screw cases. 4340 * Nothing is locked currently, so taking this lock is safe. 4341 */ 4342 error = VFS_RENAMELOCK_ENTER(mp); 4343 if (error) 4344 goto abort1; 4345 4346 /* 4347 * Now fdvp, fvp, tdvp, and (if nonnull) tvp are referenced, 4348 * and nothing is locked except for the vfs rename lock. 4349 * 4350 * The next step is a little rain dance to conform to the 4351 * insane lock protocol, even though it does nothing to ward 4352 * off race conditions. 4353 * 4354 * We need tdvp and tvp to be locked. However, because we have 4355 * unlocked tdvp in order to hold no locks while we take the 4356 * vfs rename lock, tvp may be wrong here, and we can't safely 4357 * lock it even if the sensible file systems will just unlock 4358 * it straight away. Consequently, we must lock tdvp and then 4359 * relookup tvp to get it locked. 4360 * 4361 * Finally, because the VOP_RENAME protocol is brain-damaged 4362 * and various file systems insanely depend on the semantics of 4363 * this brain damage, the lookup of to must be the last lookup 4364 * before VOP_RENAME. 4365 */ 4366 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 4367 error = relookup(tdvp, &tnd.ni_vp, &tnd.ni_cnd, 0); 4368 if (error) 4369 goto abort2; 4370 4371 /* 4372 * Drop the old tvp and pick up the new one -- which might be 4373 * the same, but that doesn't matter to us. After this, tdvp 4374 * and tvp should both be locked. 4375 */ 4376 if (tvp != NULL) 4377 vrele(tvp); 4378 tvp = tnd.ni_vp; 4379 KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 4380 KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 4381 4382 /* 4383 * The old do_sys_rename had various consistency checks here 4384 * involving fvp and tvp. fvp is bogus already here, and tvp 4385 * will become bogus soon in any sensible file system, so the 4386 * only purpose in putting these checks here is to give lip 4387 * service to these screw cases and to acknowledge that they 4388 * exist, not actually to handle them, but here you go 4389 * anyway... 4390 */ 4391 4392 /* 4393 * Acknowledge that directories and non-directories aren't 4394 * suposed to mix. 4395 */ 4396 if (tvp != NULL) { 4397 if ((fvp->v_type == VDIR) && (tvp->v_type != VDIR)) { 4398 error = ENOTDIR; 4399 goto abort3; 4400 } else if ((fvp->v_type != VDIR) && (tvp->v_type == VDIR)) { 4401 error = EISDIR; 4402 goto abort3; 4403 } 4404 } 4405 4406 /* 4407 * Acknowledge some random screw case, among the dozens that 4408 * might arise. 4409 */ 4410 if (fvp == tdvp) { 4411 error = EINVAL; 4412 goto abort3; 4413 } 4414 4415 /* 4416 * Acknowledge that POSIX has a wacky screw case. 4417 * 4418 * XXX Eventually the retain flag needs to be passed on to 4419 * VOP_RENAME. 4420 */ 4421 if (fvp == tvp) { 4422 if (retain) { 4423 error = 0; 4424 goto abort3; 4425 } else if ((fdvp == tdvp) && 4426 (fnd.ni_cnd.cn_namelen == tnd.ni_cnd.cn_namelen) && 4427 (0 == memcmp(fnd.ni_cnd.cn_nameptr, tnd.ni_cnd.cn_nameptr, 4428 fnd.ni_cnd.cn_namelen))) { 4429 error = 0; 4430 goto abort3; 4431 } 4432 } 4433 4434 /* 4435 * Make sure veriexec can screw us up. (But a race can screw 4436 * up veriexec, of course -- remember, fvp and (soon) tvp are 4437 * bogus.) 4438 */ 4439 #if NVERIEXEC > 0 4440 { 4441 char *f1, *f2; 4442 size_t f1_len; 4443 size_t f2_len; 4444 4445 f1_len = fnd.ni_cnd.cn_namelen + 1; 4446 f1 = kmem_alloc(f1_len, KM_SLEEP); 4447 strlcpy(f1, fnd.ni_cnd.cn_nameptr, f1_len); 4448 4449 f2_len = tnd.ni_cnd.cn_namelen + 1; 4450 f2 = kmem_alloc(f2_len, KM_SLEEP); 4451 strlcpy(f2, tnd.ni_cnd.cn_nameptr, f2_len); 4452 4453 error = veriexec_renamechk(curlwp, fvp, f1, tvp, f2); 4454 4455 kmem_free(f1, f1_len); 4456 kmem_free(f2, f2_len); 4457 4458 if (error) 4459 goto abort3; 4460 } 4461 #endif /* NVERIEXEC > 0 */ 4462 4463 /* 4464 * All ready. Incant the rename vop. 4465 */ 4466 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4467 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4468 KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 4469 KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 4470 error = VOP_RENAME(fdvp, fvp, &fnd.ni_cnd, tdvp, tvp, &tnd.ni_cnd); 4471 4472 /* 4473 * VOP_RENAME releases fdvp, fvp, tdvp, and tvp, and unlocks 4474 * tdvp and tvp. But we can't assert any of that. 4475 */ 4476 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4477 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4478 /* XXX KASSERT(VOP_ISLOCKED(tdvp) != LK_EXCLUSIVE); */ 4479 /* XXX KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) != LK_EXCLUSIVE)); */ 4480 4481 /* 4482 * So all we have left to do is to drop the rename lock and 4483 * destroy the pathbufs. 4484 */ 4485 VFS_RENAMELOCK_EXIT(mp); 4486 goto out2; 4487 4488 abort3: if ((tvp != NULL) && (tvp != tdvp)) 4489 VOP_UNLOCK(tvp); 4490 abort2: VOP_UNLOCK(tdvp); 4491 VFS_RENAMELOCK_EXIT(mp); 4492 abort1: VOP_ABORTOP(tdvp, &tnd.ni_cnd); 4493 vrele(tdvp); 4494 if (tvp != NULL) 4495 vrele(tvp); 4496 abort0: VOP_ABORTOP(fdvp, &fnd.ni_cnd); 4497 vrele(fdvp); 4498 vrele(fvp); 4499 out2: pathbuf_destroy(tpb); 4500 out1: pathbuf_destroy(fpb); 4501 out0: return error; 4502 } 4503 4504 /* 4505 * Make a directory file. 4506 */ 4507 /* ARGSUSED */ 4508 int 4509 sys_mkdir(struct lwp *l, const struct sys_mkdir_args *uap, register_t *retval) 4510 { 4511 /* { 4512 syscallarg(const char *) path; 4513 syscallarg(int) mode; 4514 } */ 4515 4516 return do_sys_mkdirat(l, AT_FDCWD, SCARG(uap, path), 4517 SCARG(uap, mode), UIO_USERSPACE); 4518 } 4519 4520 int 4521 sys_mkdirat(struct lwp *l, const struct sys_mkdirat_args *uap, 4522 register_t *retval) 4523 { 4524 /* { 4525 syscallarg(int) fd; 4526 syscallarg(const char *) path; 4527 syscallarg(int) mode; 4528 } */ 4529 4530 return do_sys_mkdirat(l, SCARG(uap, fd), SCARG(uap, path), 4531 SCARG(uap, mode), UIO_USERSPACE); 4532 } 4533 4534 4535 int 4536 do_sys_mkdir(const char *path, mode_t mode, enum uio_seg seg) 4537 { 4538 return do_sys_mkdirat(NULL, AT_FDCWD, path, mode, UIO_USERSPACE); 4539 } 4540 4541 static int 4542 do_sys_mkdirat(struct lwp *l, int fdat, const char *path, mode_t mode, 4543 enum uio_seg seg) 4544 { 4545 struct proc *p = curlwp->l_proc; 4546 struct vnode *vp; 4547 struct vattr vattr; 4548 int error; 4549 struct pathbuf *pb; 4550 struct nameidata nd; 4551 4552 KASSERT(l != NULL || fdat == AT_FDCWD); 4553 4554 /* XXX bollocks, should pass in a pathbuf */ 4555 error = pathbuf_maybe_copyin(path, seg, &pb); 4556 if (error) { 4557 return error; 4558 } 4559 4560 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT, pb); 4561 4562 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 4563 pathbuf_destroy(pb); 4564 return (error); 4565 } 4566 vp = nd.ni_vp; 4567 if (vp != NULL) { 4568 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 4569 if (nd.ni_dvp == vp) 4570 vrele(nd.ni_dvp); 4571 else 4572 vput(nd.ni_dvp); 4573 vrele(vp); 4574 pathbuf_destroy(pb); 4575 return (EEXIST); 4576 } 4577 vattr_null(&vattr); 4578 vattr.va_type = VDIR; 4579 /* We will read cwdi->cwdi_cmask unlocked. */ 4580 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 4581 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 4582 if (!error) 4583 vrele(nd.ni_vp); 4584 vput(nd.ni_dvp); 4585 pathbuf_destroy(pb); 4586 return (error); 4587 } 4588 4589 /* 4590 * Remove a directory file. 4591 */ 4592 /* ARGSUSED */ 4593 int 4594 sys_rmdir(struct lwp *l, const struct sys_rmdir_args *uap, register_t *retval) 4595 { 4596 return do_sys_unlinkat(l, AT_FDCWD, SCARG(uap, path), 4597 AT_REMOVEDIR, UIO_USERSPACE); 4598 } 4599 4600 /* 4601 * Read a block of directory entries in a file system independent format. 4602 */ 4603 int 4604 sys___getdents30(struct lwp *l, const struct sys___getdents30_args *uap, register_t *retval) 4605 { 4606 /* { 4607 syscallarg(int) fd; 4608 syscallarg(char *) buf; 4609 syscallarg(size_t) count; 4610 } */ 4611 file_t *fp; 4612 int error, done; 4613 4614 /* fd_getvnode() will use the descriptor for us */ 4615 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4616 return (error); 4617 if ((fp->f_flag & FREAD) == 0) { 4618 error = EBADF; 4619 goto out; 4620 } 4621 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 4622 SCARG(uap, count), &done, l, 0, 0); 4623 ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, buf), done, error); 4624 *retval = done; 4625 out: 4626 fd_putfile(SCARG(uap, fd)); 4627 return (error); 4628 } 4629 4630 /* 4631 * Set the mode mask for creation of filesystem nodes. 4632 */ 4633 int 4634 sys_umask(struct lwp *l, const struct sys_umask_args *uap, register_t *retval) 4635 { 4636 /* { 4637 syscallarg(mode_t) newmask; 4638 } */ 4639 struct proc *p = l->l_proc; 4640 struct cwdinfo *cwdi; 4641 4642 /* 4643 * cwdi->cwdi_cmask will be read unlocked elsewhere. What's 4644 * important is that we serialize changes to the mask. The 4645 * rw_exit() will issue a write memory barrier on our behalf, 4646 * and force the changes out to other CPUs (as it must use an 4647 * atomic operation, draining the local CPU's store buffers). 4648 */ 4649 cwdi = p->p_cwdi; 4650 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 4651 *retval = cwdi->cwdi_cmask; 4652 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 4653 rw_exit(&cwdi->cwdi_lock); 4654 4655 return (0); 4656 } 4657 4658 int 4659 dorevoke(struct vnode *vp, kauth_cred_t cred) 4660 { 4661 struct vattr vattr; 4662 int error, fs_decision; 4663 4664 vn_lock(vp, LK_SHARED | LK_RETRY); 4665 error = VOP_GETATTR(vp, &vattr, cred); 4666 VOP_UNLOCK(vp); 4667 if (error != 0) 4668 return error; 4669 fs_decision = (kauth_cred_geteuid(cred) == vattr.va_uid) ? 0 : EPERM; 4670 error = kauth_authorize_vnode(cred, KAUTH_VNODE_REVOKE, vp, NULL, 4671 fs_decision); 4672 if (!error) 4673 VOP_REVOKE(vp, REVOKEALL); 4674 return (error); 4675 } 4676 4677 /* 4678 * Void all references to file by ripping underlying filesystem 4679 * away from vnode. 4680 */ 4681 /* ARGSUSED */ 4682 int 4683 sys_revoke(struct lwp *l, const struct sys_revoke_args *uap, register_t *retval) 4684 { 4685 /* { 4686 syscallarg(const char *) path; 4687 } */ 4688 struct vnode *vp; 4689 int error; 4690 4691 error = namei_simple_user(SCARG(uap, path), 4692 NSM_FOLLOW_TRYEMULROOT, &vp); 4693 if (error != 0) 4694 return (error); 4695 error = dorevoke(vp, l->l_cred); 4696 vrele(vp); 4697 return (error); 4698 } 4699 4700 /* 4701 * Allocate backing store for a file, filling a hole without having to 4702 * explicitly write anything out. 4703 */ 4704 /* ARGSUSED */ 4705 int 4706 sys_posix_fallocate(struct lwp *l, const struct sys_posix_fallocate_args *uap, 4707 register_t *retval) 4708 { 4709 /* { 4710 syscallarg(int) fd; 4711 syscallarg(off_t) pos; 4712 syscallarg(off_t) len; 4713 } */ 4714 int fd; 4715 off_t pos, len; 4716 struct file *fp; 4717 struct vnode *vp; 4718 int error; 4719 4720 fd = SCARG(uap, fd); 4721 pos = SCARG(uap, pos); 4722 len = SCARG(uap, len); 4723 4724 if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) { 4725 *retval = EINVAL; 4726 return 0; 4727 } 4728 4729 error = fd_getvnode(fd, &fp); 4730 if (error) { 4731 *retval = error; 4732 return 0; 4733 } 4734 if ((fp->f_flag & FWRITE) == 0) { 4735 error = EBADF; 4736 goto fail; 4737 } 4738 vp = fp->f_vnode; 4739 4740 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4741 if (vp->v_type == VDIR) { 4742 error = EISDIR; 4743 } else { 4744 error = VOP_FALLOCATE(vp, pos, len); 4745 } 4746 VOP_UNLOCK(vp); 4747 4748 fail: 4749 fd_putfile(fd); 4750 *retval = error; 4751 return 0; 4752 } 4753 4754 /* 4755 * Deallocate backing store for a file, creating a hole. Also used for 4756 * invoking TRIM on disks. 4757 */ 4758 /* ARGSUSED */ 4759 int 4760 sys_fdiscard(struct lwp *l, const struct sys_fdiscard_args *uap, 4761 register_t *retval) 4762 { 4763 /* { 4764 syscallarg(int) fd; 4765 syscallarg(off_t) pos; 4766 syscallarg(off_t) len; 4767 } */ 4768 int fd; 4769 off_t pos, len; 4770 struct file *fp; 4771 struct vnode *vp; 4772 int error; 4773 4774 fd = SCARG(uap, fd); 4775 pos = SCARG(uap, pos); 4776 len = SCARG(uap, len); 4777 4778 if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) { 4779 return EINVAL; 4780 } 4781 4782 error = fd_getvnode(fd, &fp); 4783 if (error) { 4784 return error; 4785 } 4786 if ((fp->f_flag & FWRITE) == 0) { 4787 error = EBADF; 4788 goto fail; 4789 } 4790 vp = fp->f_vnode; 4791 4792 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4793 if (vp->v_type == VDIR) { 4794 error = EISDIR; 4795 } else { 4796 error = VOP_FDISCARD(vp, pos, len); 4797 } 4798 VOP_UNLOCK(vp); 4799 4800 fail: 4801 fd_putfile(fd); 4802 return error; 4803 } 4804
Indexes created Fri Oct 03 02:09:57 GMT 2025