vfs_syscalls.c revision 1.533.2.2
1 /* $NetBSD: vfs_syscalls.c,v 1.533.2.2 2023/03/07 20:01:06 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * (c) UNIX System Laboratories, Inc. 36 * All or some portions of this file are derived from material licensed 37 * to the University of California by American Telephone and Telegraph 38 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 39 * the permission of UNIX System Laboratories, Inc. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 66 */ 67 68 /* 69 * Virtual File System System Calls 70 */ 71 72 #include <sys/cdefs.h> 73 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.533.2.2 2023/03/07 20:01:06 martin Exp $"); 74 75 #ifdef _KERNEL_OPT 76 #include "opt_fileassoc.h" 77 #include "veriexec.h" 78 #endif 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/namei.h> 83 #include <sys/filedesc.h> 84 #include <sys/kernel.h> 85 #include <sys/file.h> 86 #include <sys/fcntl.h> 87 #include <sys/stat.h> 88 #include <sys/vnode.h> 89 #include <sys/mount.h> 90 #include <sys/fstrans.h> 91 #include <sys/proc.h> 92 #include <sys/uio.h> 93 #include <sys/kmem.h> 94 #include <sys/dirent.h> 95 #include <sys/sysctl.h> 96 #include <sys/syscallargs.h> 97 #include <sys/vfs_syscalls.h> 98 #include <sys/quota.h> 99 #include <sys/quotactl.h> 100 #include <sys/ktrace.h> 101 #ifdef FILEASSOC 102 #include <sys/fileassoc.h> 103 #endif /* FILEASSOC */ 104 #include <sys/extattr.h> 105 #include <sys/verified_exec.h> 106 #include <sys/kauth.h> 107 #include <sys/atomic.h> 108 #include <sys/module.h> 109 #include <sys/buf.h> 110 #include <sys/event.h> 111 #include <sys/compat_stub.h> 112 113 #include <miscfs/genfs/genfs.h> 114 #include <miscfs/specfs/specdev.h> 115 116 #include <nfs/rpcv2.h> 117 #include <nfs/nfsproto.h> 118 #include <nfs/nfs.h> 119 #include <nfs/nfs_var.h> 120 121 /* XXX this shouldn't be here */ 122 #ifndef OFF_T_MAX 123 #define OFF_T_MAX __type_max(off_t) 124 #endif 125 126 static int change_flags(struct vnode *, u_long, struct lwp *); 127 static int change_mode(struct vnode *, int, struct lwp *); 128 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); 129 static int do_sys_openat(lwp_t *, int, const char *, int, int, int *); 130 static int do_sys_mkdirat(struct lwp *l, int, const char *, mode_t, 131 enum uio_seg); 132 static int do_sys_mkfifoat(struct lwp *, int, const char *, mode_t); 133 static int do_sys_symlinkat(struct lwp *, const char *, int, const char *, 134 enum uio_seg); 135 static int do_sys_renameat(struct lwp *l, int, const char *, int, const char *, 136 enum uio_seg, int); 137 static int do_sys_readlinkat(struct lwp *, int, const char *, char *, 138 size_t, register_t *); 139 static int do_sys_unlinkat(struct lwp *, int, const char *, int, enum uio_seg); 140 141 static int fd_nameiat(struct lwp *, int, struct nameidata *); 142 static int fd_nameiat_simple_user(struct lwp *, int, const char *, 143 namei_simple_flags_t, struct vnode **); 144 145 /* 146 * This table is used to maintain compatibility with 4.3BSD 147 * and NetBSD 0.9 mount syscalls - and possibly other systems. 148 * Note, the order is important! 149 * 150 * Do not modify this table. It should only contain filesystems 151 * supported by NetBSD 0.9 and 4.3BSD. 152 */ 153 const char * const mountcompatnames[] = { 154 NULL, /* 0 = MOUNT_NONE */ 155 MOUNT_FFS, /* 1 = MOUNT_UFS */ 156 MOUNT_NFS, /* 2 */ 157 MOUNT_MFS, /* 3 */ 158 MOUNT_MSDOS, /* 4 */ 159 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 160 MOUNT_FDESC, /* 6 */ 161 MOUNT_KERNFS, /* 7 */ 162 NULL, /* 8 = MOUNT_DEVFS */ 163 MOUNT_AFS, /* 9 */ 164 }; 165 166 const int nmountcompatnames = __arraycount(mountcompatnames); 167 168 static int 169 fd_nameiat(struct lwp *l, int fdat, struct nameidata *ndp) 170 { 171 file_t *dfp; 172 int error; 173 174 if (fdat != AT_FDCWD) { 175 if ((error = fd_getvnode(fdat, &dfp)) != 0) 176 goto out; 177 178 NDAT(ndp, dfp->f_vnode); 179 } 180 181 error = namei(ndp); 182 183 if (fdat != AT_FDCWD) 184 fd_putfile(fdat); 185 out: 186 return error; 187 } 188 189 static int 190 fd_nameiat_simple_user(struct lwp *l, int fdat, const char *path, 191 namei_simple_flags_t sflags, struct vnode **vp_ret) 192 { 193 file_t *dfp; 194 struct vnode *dvp; 195 int error; 196 197 if (fdat != AT_FDCWD) { 198 if ((error = fd_getvnode(fdat, &dfp)) != 0) 199 goto out; 200 201 dvp = dfp->f_vnode; 202 } else { 203 dvp = NULL; 204 } 205 206 error = nameiat_simple_user(dvp, path, sflags, vp_ret); 207 208 if (fdat != AT_FDCWD) 209 fd_putfile(fdat); 210 out: 211 return error; 212 } 213 214 static int 215 open_setfp(struct lwp *l, file_t *fp, struct vnode *vp, int indx, int flags) 216 { 217 int error; 218 219 fp->f_flag = flags & FMASK; 220 fp->f_type = DTYPE_VNODE; 221 fp->f_ops = &vnops; 222 fp->f_vnode = vp; 223 224 if (flags & (O_EXLOCK | O_SHLOCK)) { 225 struct flock lf; 226 int type; 227 228 lf.l_whence = SEEK_SET; 229 lf.l_start = 0; 230 lf.l_len = 0; 231 if (flags & O_EXLOCK) 232 lf.l_type = F_WRLCK; 233 else 234 lf.l_type = F_RDLCK; 235 type = F_FLOCK; 236 if ((flags & FNONBLOCK) == 0) 237 type |= F_WAIT; 238 VOP_UNLOCK(vp); 239 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 240 if (error) { 241 (void) vn_close(vp, fp->f_flag, fp->f_cred); 242 fd_abort(l->l_proc, fp, indx); 243 return error; 244 } 245 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 246 atomic_or_uint(&fp->f_flag, FHASLOCK); 247 } 248 if (flags & O_CLOEXEC) 249 fd_set_exclose(l, indx, true); 250 return 0; 251 } 252 253 static int 254 mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags, 255 void *data, size_t *data_len) 256 { 257 struct mount *mp; 258 int error = 0, saved_flags; 259 260 mp = vp->v_mount; 261 saved_flags = mp->mnt_flag; 262 263 /* We can operate only on VV_ROOT nodes. */ 264 if ((vp->v_vflag & VV_ROOT) == 0) { 265 error = EINVAL; 266 goto out; 267 } 268 269 /* 270 * We only allow the filesystem to be reloaded if it 271 * is currently mounted read-only. Additionally, we 272 * prevent read-write to read-only downgrades. 273 */ 274 if ((flags & (MNT_RELOAD | MNT_RDONLY)) != 0 && 275 (mp->mnt_flag & MNT_RDONLY) == 0 && 276 (mp->mnt_iflag & IMNT_CAN_RWTORO) == 0) { 277 error = EOPNOTSUPP; /* Needs translation */ 278 goto out; 279 } 280 281 /* 282 * Enabling MNT_UNION requires a covered mountpoint and 283 * must not happen on the root mount. 284 */ 285 if ((flags & MNT_UNION) != 0 && mp->mnt_vnodecovered == NULLVP) { 286 error = EOPNOTSUPP; 287 goto out; 288 } 289 290 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 291 KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data); 292 if (error) 293 goto out; 294 295 error = vfs_suspend(mp, 0); 296 if (error) 297 goto out; 298 299 mutex_enter(&mp->mnt_updating); 300 301 mp->mnt_flag &= ~MNT_OP_FLAGS; 302 mp->mnt_flag |= flags & MNT_OP_FLAGS; 303 304 /* 305 * Set the mount level flags. 306 */ 307 if ((flags & MNT_RDONLY) != (mp->mnt_flag & MNT_RDONLY)) { 308 if ((flags & MNT_RDONLY)) 309 mp->mnt_iflag |= IMNT_WANTRDONLY; 310 else 311 mp->mnt_iflag |= IMNT_WANTRDWR; 312 } 313 mp->mnt_flag &= ~MNT_BASIC_FLAGS; 314 mp->mnt_flag |= flags & MNT_BASIC_FLAGS; 315 if ((mp->mnt_iflag & IMNT_WANTRDONLY)) 316 mp->mnt_flag &= ~MNT_RDONLY; 317 318 error = VFS_MOUNT(mp, path, data, data_len); 319 320 if (error && data != NULL) { 321 int error2; 322 323 /* 324 * Update failed; let's try and see if it was an 325 * export request. For compat with 3.0 and earlier. 326 */ 327 error2 = vfs_hooks_reexport(mp, path, data); 328 329 /* 330 * Only update error code if the export request was 331 * understood but some problem occurred while 332 * processing it. 333 */ 334 if (error2 != EJUSTRETURN) 335 error = error2; 336 } 337 338 if (error == 0 && (mp->mnt_iflag & IMNT_WANTRDONLY)) 339 mp->mnt_flag |= MNT_RDONLY; 340 if (error) 341 mp->mnt_flag = saved_flags; 342 mp->mnt_flag &= ~MNT_OP_FLAGS; 343 mp->mnt_iflag &= ~(IMNT_WANTRDONLY | IMNT_WANTRDWR); 344 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 345 if ((mp->mnt_iflag & IMNT_ONWORKLIST) == 0) 346 vfs_syncer_add_to_worklist(mp); 347 } else { 348 if ((mp->mnt_iflag & IMNT_ONWORKLIST) != 0) 349 vfs_syncer_remove_from_worklist(mp); 350 } 351 mutex_exit(&mp->mnt_updating); 352 vfs_resume(mp); 353 354 if ((error == 0) && !(saved_flags & MNT_EXTATTR) && 355 (flags & MNT_EXTATTR)) { 356 if (VFS_EXTATTRCTL(mp, EXTATTR_CMD_START, 357 NULL, 0, NULL) != 0) { 358 printf("%s: failed to start extattr, error = %d", 359 mp->mnt_stat.f_mntonname, error); 360 mp->mnt_flag &= ~MNT_EXTATTR; 361 } 362 } 363 364 if ((error == 0) && (saved_flags & MNT_EXTATTR) && 365 !(flags & MNT_EXTATTR)) { 366 if (VFS_EXTATTRCTL(mp, EXTATTR_CMD_STOP, 367 NULL, 0, NULL) != 0) { 368 printf("%s: failed to stop extattr, error = %d", 369 mp->mnt_stat.f_mntonname, error); 370 mp->mnt_flag |= MNT_RDONLY; 371 } 372 } 373 out: 374 return (error); 375 } 376 377 static int 378 mount_get_vfsops(const char *fstype, enum uio_seg type_seg, 379 struct vfsops **vfsops) 380 { 381 char fstypename[sizeof(((struct statvfs *)NULL)->f_fstypename)]; 382 int error; 383 384 if (type_seg == UIO_USERSPACE) { 385 /* Copy file-system type from userspace. */ 386 error = copyinstr(fstype, fstypename, sizeof(fstypename), NULL); 387 } else { 388 error = copystr(fstype, fstypename, sizeof(fstypename), NULL); 389 KASSERT(error == 0); 390 } 391 392 if (error) { 393 /* 394 * Historically, filesystem types were identified by numbers. 395 * If we get an integer for the filesystem type instead of a 396 * string, we check to see if it matches one of the historic 397 * filesystem types. 398 */ 399 u_long fsindex = (u_long)fstype; 400 if (fsindex >= nmountcompatnames || 401 mountcompatnames[fsindex] == NULL) 402 return ENODEV; 403 strlcpy(fstypename, mountcompatnames[fsindex], 404 sizeof(fstypename)); 405 } 406 407 /* Accept `ufs' as an alias for `ffs', for compatibility. */ 408 if (strcmp(fstypename, "ufs") == 0) 409 fstypename[0] = 'f'; 410 411 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 412 return 0; 413 414 /* If we can autoload a vfs module, try again */ 415 (void)module_autoload(fstypename, MODULE_CLASS_VFS); 416 417 if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) 418 return 0; 419 420 return ENODEV; 421 } 422 423 static int 424 mount_getargs(struct lwp *l, struct vnode *vp, const char *path, int flags, 425 void *data, size_t *data_len) 426 { 427 struct mount *mp; 428 int error; 429 430 /* If MNT_GETARGS is specified, it should be the only flag. */ 431 if (flags & ~MNT_GETARGS) 432 return EINVAL; 433 434 mp = vp->v_mount; 435 436 /* XXX: probably some notion of "can see" here if we want isolation. */ 437 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 438 KAUTH_REQ_SYSTEM_MOUNT_GET, mp, data, NULL); 439 if (error) 440 return error; 441 442 if ((vp->v_vflag & VV_ROOT) == 0) 443 return EINVAL; 444 445 if (vfs_busy(mp)) 446 return EPERM; 447 448 mutex_enter(&mp->mnt_updating); 449 mp->mnt_flag &= ~MNT_OP_FLAGS; 450 mp->mnt_flag |= MNT_GETARGS; 451 error = VFS_MOUNT(mp, path, data, data_len); 452 mp->mnt_flag &= ~MNT_OP_FLAGS; 453 mutex_exit(&mp->mnt_updating); 454 455 vfs_unbusy(mp); 456 return (error); 457 } 458 459 int 460 sys___mount50(struct lwp *l, const struct sys___mount50_args *uap, register_t *retval) 461 { 462 /* { 463 syscallarg(const char *) type; 464 syscallarg(const char *) path; 465 syscallarg(int) flags; 466 syscallarg(void *) data; 467 syscallarg(size_t) data_len; 468 } */ 469 470 return do_sys_mount(l, SCARG(uap, type), UIO_USERSPACE, SCARG(uap, path), 471 SCARG(uap, flags), SCARG(uap, data), UIO_USERSPACE, 472 SCARG(uap, data_len), retval); 473 } 474 475 int 476 do_sys_mount(struct lwp *l, const char *type, enum uio_seg type_seg, 477 const char *path, int flags, void *data, enum uio_seg data_seg, 478 size_t data_len, register_t *retval) 479 { 480 struct vfsops *vfsops = NULL; /* XXX gcc4.8 */ 481 struct vnode *vp; 482 void *data_buf = data; 483 bool vfsopsrele = false; 484 size_t alloc_sz = 0; 485 int error; 486 487 /* 488 * Get vnode to be covered 489 */ 490 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 491 if (error != 0) { 492 vp = NULL; 493 goto done; 494 } 495 496 if (flags & (MNT_GETARGS | MNT_UPDATE)) { 497 vfsops = vp->v_mount->mnt_op; 498 } else { 499 /* 'type' is userspace */ 500 error = mount_get_vfsops(type, type_seg, &vfsops); 501 if (error != 0) 502 goto done; 503 vfsopsrele = true; 504 } 505 506 /* 507 * We allow data to be NULL, even for userspace. Some fs's don't need 508 * it. The others will handle NULL. 509 */ 510 if (data != NULL && data_seg == UIO_USERSPACE) { 511 if (data_len == 0) { 512 /* No length supplied, use default for filesystem */ 513 data_len = vfsops->vfs_min_mount_data; 514 515 /* 516 * Hopefully a longer buffer won't make copyin() fail. 517 * For compatibility with 3.0 and earlier. 518 */ 519 if (flags & MNT_UPDATE 520 && data_len < sizeof (struct mnt_export_args30)) 521 data_len = sizeof (struct mnt_export_args30); 522 } 523 if ((data_len == 0) || (data_len > VFS_MAX_MOUNT_DATA)) { 524 error = EINVAL; 525 goto done; 526 } 527 alloc_sz = data_len; 528 data_buf = kmem_alloc(alloc_sz, KM_SLEEP); 529 530 /* NFS needs the buffer even for mnt_getargs .... */ 531 error = copyin(data, data_buf, data_len); 532 if (error != 0) 533 goto done; 534 } 535 536 if (flags & MNT_GETARGS) { 537 if (data_len == 0) { 538 error = EINVAL; 539 goto done; 540 } 541 error = mount_getargs(l, vp, path, flags, data_buf, &data_len); 542 if (error != 0) 543 goto done; 544 if (data_seg == UIO_USERSPACE) 545 error = copyout(data_buf, data, data_len); 546 *retval = data_len; 547 } else if (flags & MNT_UPDATE) { 548 error = mount_update(l, vp, path, flags, data_buf, &data_len); 549 } else { 550 /* Locking is handled internally in mount_domount(). */ 551 KASSERT(vfsopsrele == true); 552 error = mount_domount(l, &vp, vfsops, path, flags, data_buf, 553 &data_len); 554 vfsopsrele = false; 555 } 556 if (!error) 557 KNOTE(&fs_klist, VQ_MOUNT); 558 559 done: 560 if (vfsopsrele) 561 vfs_delref(vfsops); 562 if (vp != NULL) { 563 vrele(vp); 564 } 565 if (data_buf != data) 566 kmem_free(data_buf, alloc_sz); 567 return (error); 568 } 569 570 /* 571 * Unmount a file system. 572 * 573 * Note: unmount takes a path to the vnode mounted on as argument, 574 * not special file (as before). 575 */ 576 /* ARGSUSED */ 577 int 578 sys_unmount(struct lwp *l, const struct sys_unmount_args *uap, register_t *retval) 579 { 580 /* { 581 syscallarg(const char *) path; 582 syscallarg(int) flags; 583 } */ 584 struct vnode *vp; 585 struct mount *mp; 586 int error; 587 struct pathbuf *pb; 588 struct nameidata nd; 589 590 error = pathbuf_copyin(SCARG(uap, path), &pb); 591 if (error) { 592 return error; 593 } 594 595 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, pb); 596 if ((error = namei(&nd)) != 0) { 597 pathbuf_destroy(pb); 598 return error; 599 } 600 vp = nd.ni_vp; 601 pathbuf_destroy(pb); 602 603 mp = vp->v_mount; 604 vfs_ref(mp); 605 VOP_UNLOCK(vp); 606 607 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 608 KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT, mp, NULL, NULL); 609 if (error) { 610 vrele(vp); 611 vfs_rele(mp); 612 return (error); 613 } 614 615 /* 616 * Don't allow unmounting the root file system. 617 */ 618 if (mp->mnt_flag & MNT_ROOTFS) { 619 vrele(vp); 620 vfs_rele(mp); 621 return (EINVAL); 622 } 623 624 /* 625 * Must be the root of the filesystem 626 */ 627 if ((vp->v_vflag & VV_ROOT) == 0) { 628 vrele(vp); 629 vfs_rele(mp); 630 return (EINVAL); 631 } 632 633 vrele(vp); 634 error = dounmount(mp, SCARG(uap, flags), l); 635 vfs_rele(mp); 636 if (!error) 637 KNOTE(&fs_klist, VQ_UNMOUNT); 638 return error; 639 } 640 641 /* 642 * Sync each mounted filesystem. 643 */ 644 #ifdef DEBUG 645 int syncprt = 0; 646 struct ctldebug debug0 = { "syncprt", &syncprt }; 647 #endif 648 649 void 650 do_sys_sync(struct lwp *l) 651 { 652 mount_iterator_t *iter; 653 struct mount *mp; 654 int asyncflag; 655 656 mountlist_iterator_init(&iter); 657 while ((mp = mountlist_iterator_next(iter)) != NULL) { 658 mutex_enter(&mp->mnt_updating); 659 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 660 asyncflag = mp->mnt_flag & MNT_ASYNC; 661 mp->mnt_flag &= ~MNT_ASYNC; 662 VFS_SYNC(mp, MNT_NOWAIT, l->l_cred); 663 if (asyncflag) 664 mp->mnt_flag |= MNT_ASYNC; 665 } 666 mutex_exit(&mp->mnt_updating); 667 } 668 mountlist_iterator_destroy(iter); 669 #ifdef DEBUG 670 if (syncprt) 671 vfs_bufstats(); 672 #endif /* DEBUG */ 673 } 674 675 /* ARGSUSED */ 676 int 677 sys_sync(struct lwp *l, const void *v, register_t *retval) 678 { 679 do_sys_sync(l); 680 return (0); 681 } 682 683 684 /* 685 * Access or change filesystem quotas. 686 * 687 * (this is really 14 different calls bundled into one) 688 */ 689 690 static int 691 do_sys_quotactl_stat(struct mount *mp, struct quotastat *info_u) 692 { 693 struct quotastat info_k; 694 int error; 695 696 /* ensure any padding bytes are cleared */ 697 memset(&info_k, 0, sizeof(info_k)); 698 699 error = vfs_quotactl_stat(mp, &info_k); 700 if (error) { 701 return error; 702 } 703 704 return copyout(&info_k, info_u, sizeof(info_k)); 705 } 706 707 static int 708 do_sys_quotactl_idtypestat(struct mount *mp, int idtype, 709 struct quotaidtypestat *info_u) 710 { 711 struct quotaidtypestat info_k; 712 int error; 713 714 /* ensure any padding bytes are cleared */ 715 memset(&info_k, 0, sizeof(info_k)); 716 717 error = vfs_quotactl_idtypestat(mp, idtype, &info_k); 718 if (error) { 719 return error; 720 } 721 722 return copyout(&info_k, info_u, sizeof(info_k)); 723 } 724 725 static int 726 do_sys_quotactl_objtypestat(struct mount *mp, int objtype, 727 struct quotaobjtypestat *info_u) 728 { 729 struct quotaobjtypestat info_k; 730 int error; 731 732 /* ensure any padding bytes are cleared */ 733 memset(&info_k, 0, sizeof(info_k)); 734 735 error = vfs_quotactl_objtypestat(mp, objtype, &info_k); 736 if (error) { 737 return error; 738 } 739 740 return copyout(&info_k, info_u, sizeof(info_k)); 741 } 742 743 static int 744 do_sys_quotactl_get(struct mount *mp, const struct quotakey *key_u, 745 struct quotaval *val_u) 746 { 747 struct quotakey key_k; 748 struct quotaval val_k; 749 int error; 750 751 /* ensure any padding bytes are cleared */ 752 memset(&val_k, 0, sizeof(val_k)); 753 754 error = copyin(key_u, &key_k, sizeof(key_k)); 755 if (error) { 756 return error; 757 } 758 759 error = vfs_quotactl_get(mp, &key_k, &val_k); 760 if (error) { 761 return error; 762 } 763 764 return copyout(&val_k, val_u, sizeof(val_k)); 765 } 766 767 static int 768 do_sys_quotactl_put(struct mount *mp, const struct quotakey *key_u, 769 const struct quotaval *val_u) 770 { 771 struct quotakey key_k; 772 struct quotaval val_k; 773 int error; 774 775 error = copyin(key_u, &key_k, sizeof(key_k)); 776 if (error) { 777 return error; 778 } 779 780 error = copyin(val_u, &val_k, sizeof(val_k)); 781 if (error) { 782 return error; 783 } 784 785 return vfs_quotactl_put(mp, &key_k, &val_k); 786 } 787 788 static int 789 do_sys_quotactl_del(struct mount *mp, const struct quotakey *key_u) 790 { 791 struct quotakey key_k; 792 int error; 793 794 error = copyin(key_u, &key_k, sizeof(key_k)); 795 if (error) { 796 return error; 797 } 798 799 return vfs_quotactl_del(mp, &key_k); 800 } 801 802 static int 803 do_sys_quotactl_cursoropen(struct mount *mp, struct quotakcursor *cursor_u) 804 { 805 struct quotakcursor cursor_k; 806 int error; 807 808 /* ensure any padding bytes are cleared */ 809 memset(&cursor_k, 0, sizeof(cursor_k)); 810 811 error = vfs_quotactl_cursoropen(mp, &cursor_k); 812 if (error) { 813 return error; 814 } 815 816 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 817 } 818 819 static int 820 do_sys_quotactl_cursorclose(struct mount *mp, struct quotakcursor *cursor_u) 821 { 822 struct quotakcursor cursor_k; 823 int error; 824 825 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 826 if (error) { 827 return error; 828 } 829 830 return vfs_quotactl_cursorclose(mp, &cursor_k); 831 } 832 833 static int 834 do_sys_quotactl_cursorskipidtype(struct mount *mp, 835 struct quotakcursor *cursor_u, int idtype) 836 { 837 struct quotakcursor cursor_k; 838 int error; 839 840 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 841 if (error) { 842 return error; 843 } 844 845 error = vfs_quotactl_cursorskipidtype(mp, &cursor_k, idtype); 846 if (error) { 847 return error; 848 } 849 850 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 851 } 852 853 static int 854 do_sys_quotactl_cursorget(struct mount *mp, struct quotakcursor *cursor_u, 855 struct quotakey *keys_u, struct quotaval *vals_u, unsigned maxnum, 856 unsigned *ret_u) 857 { 858 #define CGET_STACK_MAX 8 859 struct quotakcursor cursor_k; 860 struct quotakey stackkeys[CGET_STACK_MAX]; 861 struct quotaval stackvals[CGET_STACK_MAX]; 862 struct quotakey *keys_k; 863 struct quotaval *vals_k; 864 unsigned ret_k; 865 int error; 866 867 if (maxnum > 128) { 868 maxnum = 128; 869 } 870 871 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 872 if (error) { 873 return error; 874 } 875 876 if (maxnum <= CGET_STACK_MAX) { 877 keys_k = stackkeys; 878 vals_k = stackvals; 879 /* ensure any padding bytes are cleared */ 880 memset(keys_k, 0, maxnum * sizeof(keys_k[0])); 881 memset(vals_k, 0, maxnum * sizeof(vals_k[0])); 882 } else { 883 keys_k = kmem_zalloc(maxnum * sizeof(keys_k[0]), KM_SLEEP); 884 vals_k = kmem_zalloc(maxnum * sizeof(vals_k[0]), KM_SLEEP); 885 } 886 887 error = vfs_quotactl_cursorget(mp, &cursor_k, keys_k, vals_k, maxnum, 888 &ret_k); 889 if (error) { 890 goto fail; 891 } 892 893 error = copyout(keys_k, keys_u, ret_k * sizeof(keys_k[0])); 894 if (error) { 895 goto fail; 896 } 897 898 error = copyout(vals_k, vals_u, ret_k * sizeof(vals_k[0])); 899 if (error) { 900 goto fail; 901 } 902 903 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 904 if (error) { 905 goto fail; 906 } 907 908 /* do last to maximize the chance of being able to recover a failure */ 909 error = copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 910 911 fail: 912 if (keys_k != stackkeys) { 913 kmem_free(keys_k, maxnum * sizeof(keys_k[0])); 914 } 915 if (vals_k != stackvals) { 916 kmem_free(vals_k, maxnum * sizeof(vals_k[0])); 917 } 918 return error; 919 } 920 921 static int 922 do_sys_quotactl_cursoratend(struct mount *mp, struct quotakcursor *cursor_u, 923 int *ret_u) 924 { 925 struct quotakcursor cursor_k; 926 int ret_k; 927 int error; 928 929 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 930 if (error) { 931 return error; 932 } 933 934 error = vfs_quotactl_cursoratend(mp, &cursor_k, &ret_k); 935 if (error) { 936 return error; 937 } 938 939 error = copyout(&ret_k, ret_u, sizeof(ret_k)); 940 if (error) { 941 return error; 942 } 943 944 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 945 } 946 947 static int 948 do_sys_quotactl_cursorrewind(struct mount *mp, struct quotakcursor *cursor_u) 949 { 950 struct quotakcursor cursor_k; 951 int error; 952 953 error = copyin(cursor_u, &cursor_k, sizeof(cursor_k)); 954 if (error) { 955 return error; 956 } 957 958 error = vfs_quotactl_cursorrewind(mp, &cursor_k); 959 if (error) { 960 return error; 961 } 962 963 return copyout(&cursor_k, cursor_u, sizeof(cursor_k)); 964 } 965 966 static int 967 do_sys_quotactl_quotaon(struct mount *mp, int idtype, const char *path_u) 968 { 969 char *path_k; 970 int error; 971 972 /* XXX this should probably be a struct pathbuf */ 973 path_k = PNBUF_GET(); 974 error = copyin(path_u, path_k, PATH_MAX); 975 if (error) { 976 PNBUF_PUT(path_k); 977 return error; 978 } 979 980 error = vfs_quotactl_quotaon(mp, idtype, path_k); 981 982 PNBUF_PUT(path_k); 983 return error; 984 } 985 986 static int 987 do_sys_quotactl_quotaoff(struct mount *mp, int idtype) 988 { 989 return vfs_quotactl_quotaoff(mp, idtype); 990 } 991 992 int 993 do_sys_quotactl(const char *path_u, const struct quotactl_args *args) 994 { 995 struct mount *mp; 996 struct vnode *vp; 997 int error; 998 999 error = namei_simple_user(path_u, NSM_FOLLOW_TRYEMULROOT, &vp); 1000 if (error != 0) 1001 return (error); 1002 mp = vp->v_mount; 1003 1004 switch (args->qc_op) { 1005 case QUOTACTL_STAT: 1006 error = do_sys_quotactl_stat(mp, args->u.stat.qc_info); 1007 break; 1008 case QUOTACTL_IDTYPESTAT: 1009 error = do_sys_quotactl_idtypestat(mp, 1010 args->u.idtypestat.qc_idtype, 1011 args->u.idtypestat.qc_info); 1012 break; 1013 case QUOTACTL_OBJTYPESTAT: 1014 error = do_sys_quotactl_objtypestat(mp, 1015 args->u.objtypestat.qc_objtype, 1016 args->u.objtypestat.qc_info); 1017 break; 1018 case QUOTACTL_GET: 1019 error = do_sys_quotactl_get(mp, 1020 args->u.get.qc_key, 1021 args->u.get.qc_val); 1022 break; 1023 case QUOTACTL_PUT: 1024 error = do_sys_quotactl_put(mp, 1025 args->u.put.qc_key, 1026 args->u.put.qc_val); 1027 break; 1028 case QUOTACTL_DEL: 1029 error = do_sys_quotactl_del(mp, args->u.del.qc_key); 1030 break; 1031 case QUOTACTL_CURSOROPEN: 1032 error = do_sys_quotactl_cursoropen(mp, 1033 args->u.cursoropen.qc_cursor); 1034 break; 1035 case QUOTACTL_CURSORCLOSE: 1036 error = do_sys_quotactl_cursorclose(mp, 1037 args->u.cursorclose.qc_cursor); 1038 break; 1039 case QUOTACTL_CURSORSKIPIDTYPE: 1040 error = do_sys_quotactl_cursorskipidtype(mp, 1041 args->u.cursorskipidtype.qc_cursor, 1042 args->u.cursorskipidtype.qc_idtype); 1043 break; 1044 case QUOTACTL_CURSORGET: 1045 error = do_sys_quotactl_cursorget(mp, 1046 args->u.cursorget.qc_cursor, 1047 args->u.cursorget.qc_keys, 1048 args->u.cursorget.qc_vals, 1049 args->u.cursorget.qc_maxnum, 1050 args->u.cursorget.qc_ret); 1051 break; 1052 case QUOTACTL_CURSORATEND: 1053 error = do_sys_quotactl_cursoratend(mp, 1054 args->u.cursoratend.qc_cursor, 1055 args->u.cursoratend.qc_ret); 1056 break; 1057 case QUOTACTL_CURSORREWIND: 1058 error = do_sys_quotactl_cursorrewind(mp, 1059 args->u.cursorrewind.qc_cursor); 1060 break; 1061 case QUOTACTL_QUOTAON: 1062 error = do_sys_quotactl_quotaon(mp, 1063 args->u.quotaon.qc_idtype, 1064 args->u.quotaon.qc_quotafile); 1065 break; 1066 case QUOTACTL_QUOTAOFF: 1067 error = do_sys_quotactl_quotaoff(mp, 1068 args->u.quotaoff.qc_idtype); 1069 break; 1070 default: 1071 error = EINVAL; 1072 break; 1073 } 1074 1075 vrele(vp); 1076 return error; 1077 } 1078 1079 /* ARGSUSED */ 1080 int 1081 sys___quotactl(struct lwp *l, const struct sys___quotactl_args *uap, 1082 register_t *retval) 1083 { 1084 /* { 1085 syscallarg(const char *) path; 1086 syscallarg(struct quotactl_args *) args; 1087 } */ 1088 struct quotactl_args args; 1089 int error; 1090 1091 error = copyin(SCARG(uap, args), &args, sizeof(args)); 1092 if (error) { 1093 return error; 1094 } 1095 1096 return do_sys_quotactl(SCARG(uap, path), &args); 1097 } 1098 1099 int 1100 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 1101 int root) 1102 { 1103 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 1104 int error = 0; 1105 1106 /* 1107 * If MNT_NOWAIT or MNT_LAZY is specified, do not 1108 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 1109 * overrides MNT_NOWAIT. 1110 */ 1111 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 1112 (flags != MNT_WAIT && flags != 0)) { 1113 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 1114 goto done; 1115 } 1116 1117 /* Get the filesystem stats now */ 1118 memset(sp, 0, sizeof(*sp)); 1119 if ((error = VFS_STATVFS(mp, sp)) != 0) { 1120 return error; 1121 } 1122 1123 if (cwdi->cwdi_rdir == NULL) 1124 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 1125 done: 1126 if (cwdi->cwdi_rdir != NULL) { 1127 size_t len; 1128 char *bp; 1129 char c; 1130 char *path = PNBUF_GET(); 1131 1132 bp = path + MAXPATHLEN; 1133 *--bp = '\0'; 1134 rw_enter(&cwdi->cwdi_lock, RW_READER); 1135 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 1136 MAXPATHLEN / 2, 0, l); 1137 rw_exit(&cwdi->cwdi_lock); 1138 if (error) { 1139 PNBUF_PUT(path); 1140 return error; 1141 } 1142 len = strlen(bp); 1143 if (len != 1) { 1144 /* 1145 * for mount points that are below our root, we can see 1146 * them, so we fix up the pathname and return them. The 1147 * rest we cannot see, so we don't allow viewing the 1148 * data. 1149 */ 1150 if (strncmp(bp, sp->f_mntonname, len) == 0 && 1151 ((c = sp->f_mntonname[len]) == '/' || c == '\0')) { 1152 (void)strlcpy(sp->f_mntonname, 1153 c == '\0' ? "/" : &sp->f_mntonname[len], 1154 sizeof(sp->f_mntonname)); 1155 } else { 1156 if (root) 1157 (void)strlcpy(sp->f_mntonname, "/", 1158 sizeof(sp->f_mntonname)); 1159 else 1160 error = EPERM; 1161 } 1162 } 1163 PNBUF_PUT(path); 1164 } 1165 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 1166 return error; 1167 } 1168 1169 /* 1170 * Get filesystem statistics by path. 1171 */ 1172 int 1173 do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb) 1174 { 1175 struct mount *mp; 1176 int error; 1177 struct vnode *vp; 1178 1179 error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp); 1180 if (error != 0) 1181 return error; 1182 mp = vp->v_mount; 1183 error = dostatvfs(mp, sb, l, flags, 1); 1184 vrele(vp); 1185 return error; 1186 } 1187 1188 /* ARGSUSED */ 1189 int 1190 sys_statvfs1(struct lwp *l, const struct sys_statvfs1_args *uap, register_t *retval) 1191 { 1192 /* { 1193 syscallarg(const char *) path; 1194 syscallarg(struct statvfs *) buf; 1195 syscallarg(int) flags; 1196 } */ 1197 struct statvfs *sb; 1198 int error; 1199 1200 sb = STATVFSBUF_GET(); 1201 error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb); 1202 if (error == 0) 1203 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1204 STATVFSBUF_PUT(sb); 1205 return error; 1206 } 1207 1208 /* 1209 * Get filesystem statistics by fd. 1210 */ 1211 int 1212 do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb) 1213 { 1214 file_t *fp; 1215 struct mount *mp; 1216 int error; 1217 1218 /* fd_getvnode() will use the descriptor for us */ 1219 if ((error = fd_getvnode(fd, &fp)) != 0) 1220 return (error); 1221 mp = fp->f_vnode->v_mount; 1222 error = dostatvfs(mp, sb, curlwp, flags, 1); 1223 fd_putfile(fd); 1224 return error; 1225 } 1226 1227 /* ARGSUSED */ 1228 int 1229 sys_fstatvfs1(struct lwp *l, const struct sys_fstatvfs1_args *uap, register_t *retval) 1230 { 1231 /* { 1232 syscallarg(int) fd; 1233 syscallarg(struct statvfs *) buf; 1234 syscallarg(int) flags; 1235 } */ 1236 struct statvfs *sb; 1237 int error; 1238 1239 sb = STATVFSBUF_GET(); 1240 error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb); 1241 if (error == 0) 1242 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 1243 STATVFSBUF_PUT(sb); 1244 return error; 1245 } 1246 1247 1248 /* 1249 * Get statistics on all filesystems. 1250 */ 1251 int 1252 do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags, 1253 int (*copyfn)(const void *, void *, size_t), size_t entry_sz, 1254 register_t *retval) 1255 { 1256 int root = 0; 1257 mount_iterator_t *iter; 1258 struct proc *p = l->l_proc; 1259 struct mount *mp; 1260 struct statvfs *sb; 1261 size_t count, maxcount; 1262 int error = 0; 1263 1264 sb = STATVFSBUF_GET(); 1265 maxcount = bufsize / entry_sz; 1266 count = 0; 1267 mountlist_iterator_init(&iter); 1268 while ((mp = mountlist_iterator_next(iter)) != NULL) { 1269 if (sfsp && count < maxcount) { 1270 error = dostatvfs(mp, sb, l, flags, 0); 1271 if (error) { 1272 error = 0; 1273 continue; 1274 } 1275 error = copyfn(sb, sfsp, entry_sz); 1276 if (error) 1277 goto out; 1278 sfsp = (char *)sfsp + entry_sz; 1279 root |= strcmp(sb->f_mntonname, "/") == 0; 1280 } 1281 count++; 1282 } 1283 1284 if (root == 0 && p->p_cwdi->cwdi_rdir) { 1285 /* 1286 * fake a root entry 1287 */ 1288 error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, 1289 sb, l, flags, 1); 1290 if (error != 0) 1291 goto out; 1292 if (sfsp) { 1293 error = copyfn(sb, sfsp, entry_sz); 1294 if (error != 0) 1295 goto out; 1296 } 1297 count++; 1298 } 1299 if (sfsp && count > maxcount) 1300 *retval = maxcount; 1301 else 1302 *retval = count; 1303 out: 1304 mountlist_iterator_destroy(iter); 1305 STATVFSBUF_PUT(sb); 1306 return error; 1307 } 1308 1309 int 1310 sys_getvfsstat(struct lwp *l, const struct sys_getvfsstat_args *uap, register_t *retval) 1311 { 1312 /* { 1313 syscallarg(struct statvfs *) buf; 1314 syscallarg(size_t) bufsize; 1315 syscallarg(int) flags; 1316 } */ 1317 1318 return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize), 1319 SCARG(uap, flags), copyout, sizeof (struct statvfs), retval); 1320 } 1321 1322 /* 1323 * Change current working directory to a given file descriptor. 1324 */ 1325 /* ARGSUSED */ 1326 int 1327 sys_fchdir(struct lwp *l, const struct sys_fchdir_args *uap, register_t *retval) 1328 { 1329 /* { 1330 syscallarg(int) fd; 1331 } */ 1332 struct proc *p = l->l_proc; 1333 struct cwdinfo *cwdi; 1334 struct vnode *vp, *tdp; 1335 struct mount *mp; 1336 file_t *fp; 1337 int error, fd; 1338 1339 /* fd_getvnode() will use the descriptor for us */ 1340 fd = SCARG(uap, fd); 1341 if ((error = fd_getvnode(fd, &fp)) != 0) 1342 return (error); 1343 vp = fp->f_vnode; 1344 1345 vref(vp); 1346 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1347 if (vp->v_type != VDIR) 1348 error = ENOTDIR; 1349 else 1350 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1351 if (error) { 1352 vput(vp); 1353 goto out; 1354 } 1355 while ((mp = vp->v_mountedhere) != NULL) { 1356 error = vfs_busy(mp); 1357 vput(vp); 1358 if (error != 0) 1359 goto out; 1360 error = VFS_ROOT(mp, &tdp); 1361 vfs_unbusy(mp); 1362 if (error) 1363 goto out; 1364 vp = tdp; 1365 } 1366 VOP_UNLOCK(vp); 1367 1368 /* 1369 * Disallow changing to a directory not under the process's 1370 * current root directory (if there is one). 1371 */ 1372 cwdi = p->p_cwdi; 1373 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1374 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 1375 vrele(vp); 1376 error = EPERM; /* operation not permitted */ 1377 } else { 1378 vrele(cwdi->cwdi_cdir); 1379 cwdi->cwdi_cdir = vp; 1380 } 1381 rw_exit(&cwdi->cwdi_lock); 1382 1383 out: 1384 fd_putfile(fd); 1385 return (error); 1386 } 1387 1388 /* 1389 * Change this process's notion of the root directory to a given file 1390 * descriptor. 1391 */ 1392 int 1393 sys_fchroot(struct lwp *l, const struct sys_fchroot_args *uap, register_t *retval) 1394 { 1395 struct proc *p = l->l_proc; 1396 struct vnode *vp; 1397 file_t *fp; 1398 int error, fd = SCARG(uap, fd); 1399 1400 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1401 KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) 1402 return error; 1403 /* fd_getvnode() will use the descriptor for us */ 1404 if ((error = fd_getvnode(fd, &fp)) != 0) 1405 return error; 1406 vp = fp->f_vnode; 1407 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1408 if (vp->v_type != VDIR) 1409 error = ENOTDIR; 1410 else 1411 error = VOP_ACCESS(vp, VEXEC, l->l_cred); 1412 VOP_UNLOCK(vp); 1413 if (error) 1414 goto out; 1415 vref(vp); 1416 1417 change_root(p->p_cwdi, vp, l); 1418 1419 out: 1420 fd_putfile(fd); 1421 return (error); 1422 } 1423 1424 /* 1425 * Change current working directory (``.''). 1426 */ 1427 /* ARGSUSED */ 1428 int 1429 sys_chdir(struct lwp *l, const struct sys_chdir_args *uap, register_t *retval) 1430 { 1431 /* { 1432 syscallarg(const char *) path; 1433 } */ 1434 struct proc *p = l->l_proc; 1435 struct cwdinfo *cwdi; 1436 int error; 1437 struct vnode *vp; 1438 1439 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1440 &vp, l)) != 0) 1441 return (error); 1442 cwdi = p->p_cwdi; 1443 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1444 vrele(cwdi->cwdi_cdir); 1445 cwdi->cwdi_cdir = vp; 1446 rw_exit(&cwdi->cwdi_lock); 1447 return (0); 1448 } 1449 1450 /* 1451 * Change notion of root (``/'') directory. 1452 */ 1453 /* ARGSUSED */ 1454 int 1455 sys_chroot(struct lwp *l, const struct sys_chroot_args *uap, register_t *retval) 1456 { 1457 /* { 1458 syscallarg(const char *) path; 1459 } */ 1460 struct proc *p = l->l_proc; 1461 int error; 1462 struct vnode *vp; 1463 1464 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1465 KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) 1466 return (error); 1467 if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE, 1468 &vp, l)) != 0) 1469 return (error); 1470 1471 change_root(p->p_cwdi, vp, l); 1472 1473 return (0); 1474 } 1475 1476 /* 1477 * Common routine for chroot and fchroot. 1478 * NB: callers need to properly authorize the change root operation. 1479 */ 1480 void 1481 change_root(struct cwdinfo *cwdi, struct vnode *vp, struct lwp *l) 1482 { 1483 struct proc *p = l->l_proc; 1484 kauth_cred_t ncred; 1485 1486 ncred = kauth_cred_alloc(); 1487 1488 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 1489 if (cwdi->cwdi_rdir != NULL) 1490 vrele(cwdi->cwdi_rdir); 1491 cwdi->cwdi_rdir = vp; 1492 1493 /* 1494 * Prevent escaping from chroot by putting the root under 1495 * the working directory. Silently chdir to / if we aren't 1496 * already there. 1497 */ 1498 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1499 /* 1500 * XXX would be more failsafe to change directory to a 1501 * deadfs node here instead 1502 */ 1503 vrele(cwdi->cwdi_cdir); 1504 vref(vp); 1505 cwdi->cwdi_cdir = vp; 1506 } 1507 rw_exit(&cwdi->cwdi_lock); 1508 1509 /* Get a write lock on the process credential. */ 1510 proc_crmod_enter(); 1511 1512 kauth_cred_clone(p->p_cred, ncred); 1513 kauth_proc_chroot(ncred, p->p_cwdi); 1514 1515 /* Broadcast our credentials to the process and other LWPs. */ 1516 proc_crmod_leave(ncred, p->p_cred, true); 1517 } 1518 1519 /* 1520 * Common routine for chroot and chdir. 1521 * XXX "where" should be enum uio_seg 1522 */ 1523 int 1524 chdir_lookup(const char *path, int where, struct vnode **vpp, struct lwp *l) 1525 { 1526 struct pathbuf *pb; 1527 struct nameidata nd; 1528 int error; 1529 1530 error = pathbuf_maybe_copyin(path, where, &pb); 1531 if (error) { 1532 return error; 1533 } 1534 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1535 if ((error = namei(&nd)) != 0) { 1536 pathbuf_destroy(pb); 1537 return error; 1538 } 1539 *vpp = nd.ni_vp; 1540 pathbuf_destroy(pb); 1541 1542 if ((*vpp)->v_type != VDIR) 1543 error = ENOTDIR; 1544 else 1545 error = VOP_ACCESS(*vpp, VEXEC, l->l_cred); 1546 1547 if (error) 1548 vput(*vpp); 1549 else 1550 VOP_UNLOCK(*vpp); 1551 return (error); 1552 } 1553 1554 /* 1555 * Internals of sys_open - path has already been converted into a pathbuf 1556 * (so we can easily reuse this function from other parts of the kernel, 1557 * like posix_spawn post-processing). 1558 */ 1559 int 1560 do_open(lwp_t *l, struct vnode *dvp, struct pathbuf *pb, int open_flags, 1561 int open_mode, int *fd) 1562 { 1563 struct proc *p = l->l_proc; 1564 struct cwdinfo *cwdi = p->p_cwdi; 1565 file_t *fp; 1566 struct vnode *vp; 1567 int flags, cmode; 1568 int indx, error; 1569 struct nameidata nd; 1570 1571 if (open_flags & O_SEARCH) { 1572 open_flags &= ~(int)O_SEARCH; 1573 } 1574 1575 flags = FFLAGS(open_flags); 1576 if ((flags & (FREAD | FWRITE)) == 0) 1577 return EINVAL; 1578 1579 if ((error = fd_allocfile(&fp, &indx)) != 0) { 1580 return error; 1581 } 1582 1583 /* We're going to read cwdi->cwdi_cmask unlocked here. */ 1584 cmode = ((open_mode &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1585 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, pb); 1586 if (dvp != NULL) 1587 NDAT(&nd, dvp); 1588 1589 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1590 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1591 fd_abort(p, fp, indx); 1592 if ((error == EDUPFD || error == EMOVEFD) && 1593 l->l_dupfd >= 0 && /* XXX from fdopen */ 1594 (error = 1595 fd_dupopen(l->l_dupfd, &indx, flags, error)) == 0) { 1596 *fd = indx; 1597 return 0; 1598 } 1599 return error; 1600 } 1601 1602 l->l_dupfd = 0; 1603 vp = nd.ni_vp; 1604 1605 if ((error = open_setfp(l, fp, vp, indx, flags))) 1606 return error; 1607 1608 VOP_UNLOCK(vp); 1609 *fd = indx; 1610 fd_affix(p, fp, indx); 1611 return 0; 1612 } 1613 1614 int 1615 fd_open(const char *path, int open_flags, int open_mode, int *fd) 1616 { 1617 struct pathbuf *pb; 1618 int error, oflags; 1619 1620 oflags = FFLAGS(open_flags); 1621 if ((oflags & (FREAD | FWRITE)) == 0) 1622 return EINVAL; 1623 1624 pb = pathbuf_create(path); 1625 if (pb == NULL) 1626 return ENOMEM; 1627 1628 error = do_open(curlwp, NULL, pb, open_flags, open_mode, fd); 1629 pathbuf_destroy(pb); 1630 1631 return error; 1632 } 1633 1634 static int 1635 do_sys_openat(lwp_t *l, int fdat, const char *path, int flags, 1636 int mode, int *fd) 1637 { 1638 file_t *dfp = NULL; 1639 struct vnode *dvp = NULL; 1640 struct pathbuf *pb; 1641 const char *pathstring = NULL; 1642 int error; 1643 1644 if (path == NULL) { 1645 MODULE_HOOK_CALL(vfs_openat_10_hook, (&pb), enosys(), error); 1646 if (error == ENOSYS) 1647 goto no_compat; 1648 if (error) 1649 return error; 1650 } else { 1651 no_compat: 1652 error = pathbuf_copyin(path, &pb); 1653 if (error) 1654 return error; 1655 } 1656 1657 pathstring = pathbuf_stringcopy_get(pb); 1658 1659 /* 1660 * fdat is ignored if: 1661 * 1) if fdat is AT_FDCWD, which means use current directory as base. 1662 * 2) if path is absolute, then fdat is useless. 1663 */ 1664 if (fdat != AT_FDCWD && pathstring[0] != '/') { 1665 /* fd_getvnode() will use the descriptor for us */ 1666 if ((error = fd_getvnode(fdat, &dfp)) != 0) 1667 goto out; 1668 1669 dvp = dfp->f_vnode; 1670 } 1671 1672 error = do_open(l, dvp, pb, flags, mode, fd); 1673 1674 if (dfp != NULL) 1675 fd_putfile(fdat); 1676 out: 1677 pathbuf_stringcopy_put(pb, pathstring); 1678 pathbuf_destroy(pb); 1679 return error; 1680 } 1681 1682 int 1683 sys_open(struct lwp *l, const struct sys_open_args *uap, register_t *retval) 1684 { 1685 /* { 1686 syscallarg(const char *) path; 1687 syscallarg(int) flags; 1688 syscallarg(int) mode; 1689 } */ 1690 int error; 1691 int fd; 1692 1693 error = do_sys_openat(l, AT_FDCWD, SCARG(uap, path), 1694 SCARG(uap, flags), SCARG(uap, mode), &fd); 1695 1696 if (error == 0) 1697 *retval = fd; 1698 1699 return error; 1700 } 1701 1702 int 1703 sys_openat(struct lwp *l, const struct sys_openat_args *uap, register_t *retval) 1704 { 1705 /* { 1706 syscallarg(int) fd; 1707 syscallarg(const char *) path; 1708 syscallarg(int) oflags; 1709 syscallarg(int) mode; 1710 } */ 1711 int error; 1712 int fd; 1713 1714 error = do_sys_openat(l, SCARG(uap, fd), SCARG(uap, path), 1715 SCARG(uap, oflags), SCARG(uap, mode), &fd); 1716 1717 if (error == 0) 1718 *retval = fd; 1719 1720 return error; 1721 } 1722 1723 static void 1724 vfs__fhfree(fhandle_t *fhp) 1725 { 1726 size_t fhsize; 1727 1728 fhsize = FHANDLE_SIZE(fhp); 1729 kmem_free(fhp, fhsize); 1730 } 1731 1732 /* 1733 * vfs_composefh: compose a filehandle. 1734 */ 1735 1736 int 1737 vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) 1738 { 1739 struct mount *mp; 1740 struct fid *fidp; 1741 int error; 1742 size_t needfhsize; 1743 size_t fidsize; 1744 1745 mp = vp->v_mount; 1746 fidp = NULL; 1747 if (*fh_size < FHANDLE_SIZE_MIN) { 1748 fidsize = 0; 1749 } else { 1750 fidsize = *fh_size - offsetof(fhandle_t, fh_fid); 1751 if (fhp != NULL) { 1752 memset(fhp, 0, *fh_size); 1753 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1754 fidp = &fhp->fh_fid; 1755 } 1756 } 1757 error = VFS_VPTOFH(vp, fidp, &fidsize); 1758 needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1759 if (error == 0 && *fh_size < needfhsize) { 1760 error = E2BIG; 1761 } 1762 *fh_size = needfhsize; 1763 return error; 1764 } 1765 1766 int 1767 vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) 1768 { 1769 struct mount *mp; 1770 fhandle_t *fhp; 1771 size_t fhsize; 1772 size_t fidsize; 1773 int error; 1774 1775 mp = vp->v_mount; 1776 fidsize = 0; 1777 error = VFS_VPTOFH(vp, NULL, &fidsize); 1778 KASSERT(error != 0); 1779 if (error != E2BIG) { 1780 goto out; 1781 } 1782 fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1783 fhp = kmem_zalloc(fhsize, KM_SLEEP); 1784 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1785 error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); 1786 if (error == 0) { 1787 KASSERT((FHANDLE_SIZE(fhp) == fhsize && 1788 FHANDLE_FILEID(fhp)->fid_len == fidsize)); 1789 *fhpp = fhp; 1790 } else { 1791 kmem_free(fhp, fhsize); 1792 } 1793 out: 1794 return error; 1795 } 1796 1797 void 1798 vfs_composefh_free(fhandle_t *fhp) 1799 { 1800 1801 vfs__fhfree(fhp); 1802 } 1803 1804 /* 1805 * vfs_fhtovp: lookup a vnode by a filehandle. 1806 */ 1807 1808 int 1809 vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) 1810 { 1811 struct mount *mp; 1812 int error; 1813 1814 *vpp = NULL; 1815 mp = vfs_getvfs(FHANDLE_FSID(fhp)); 1816 if (mp == NULL) { 1817 error = ESTALE; 1818 goto out; 1819 } 1820 if (mp->mnt_op->vfs_fhtovp == NULL) { 1821 error = EOPNOTSUPP; 1822 goto out; 1823 } 1824 error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp); 1825 out: 1826 return error; 1827 } 1828 1829 /* 1830 * vfs_copyinfh_alloc: allocate and copyin a filehandle, given 1831 * the needed size. 1832 */ 1833 1834 int 1835 vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) 1836 { 1837 fhandle_t *fhp; 1838 int error; 1839 1840 if (fhsize > FHANDLE_SIZE_MAX) { 1841 return EINVAL; 1842 } 1843 if (fhsize < FHANDLE_SIZE_MIN) { 1844 return EINVAL; 1845 } 1846 again: 1847 fhp = kmem_alloc(fhsize, KM_SLEEP); 1848 error = copyin(ufhp, fhp, fhsize); 1849 if (error == 0) { 1850 /* XXX this check shouldn't be here */ 1851 if (FHANDLE_SIZE(fhp) == fhsize) { 1852 *fhpp = fhp; 1853 return 0; 1854 } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { 1855 /* 1856 * a kludge for nfsv2 padded handles. 1857 */ 1858 size_t sz; 1859 1860 sz = FHANDLE_SIZE(fhp); 1861 kmem_free(fhp, fhsize); 1862 fhsize = sz; 1863 goto again; 1864 } else { 1865 /* 1866 * userland told us wrong size. 1867 */ 1868 error = EINVAL; 1869 } 1870 } 1871 kmem_free(fhp, fhsize); 1872 return error; 1873 } 1874 1875 void 1876 vfs_copyinfh_free(fhandle_t *fhp) 1877 { 1878 1879 vfs__fhfree(fhp); 1880 } 1881 1882 /* 1883 * Get file handle system call 1884 */ 1885 int 1886 sys___getfh30(struct lwp *l, const struct sys___getfh30_args *uap, register_t *retval) 1887 { 1888 /* { 1889 syscallarg(char *) fname; 1890 syscallarg(fhandle_t *) fhp; 1891 syscallarg(size_t *) fh_size; 1892 } */ 1893 struct vnode *vp; 1894 fhandle_t *fh; 1895 int error; 1896 struct pathbuf *pb; 1897 struct nameidata nd; 1898 size_t sz; 1899 size_t usz; 1900 1901 /* 1902 * Must be super user 1903 */ 1904 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1905 0, NULL, NULL, NULL); 1906 if (error) 1907 return (error); 1908 1909 error = pathbuf_copyin(SCARG(uap, fname), &pb); 1910 if (error) { 1911 return error; 1912 } 1913 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 1914 error = namei(&nd); 1915 if (error) { 1916 pathbuf_destroy(pb); 1917 return error; 1918 } 1919 vp = nd.ni_vp; 1920 pathbuf_destroy(pb); 1921 1922 error = vfs_composefh_alloc(vp, &fh); 1923 vput(vp); 1924 if (error != 0) { 1925 return error; 1926 } 1927 error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); 1928 if (error != 0) { 1929 goto out; 1930 } 1931 sz = FHANDLE_SIZE(fh); 1932 error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); 1933 if (error != 0) { 1934 goto out; 1935 } 1936 if (usz >= sz) { 1937 error = copyout(fh, SCARG(uap, fhp), sz); 1938 } else { 1939 error = E2BIG; 1940 } 1941 out: 1942 vfs_composefh_free(fh); 1943 return (error); 1944 } 1945 1946 /* 1947 * Open a file given a file handle. 1948 * 1949 * Check permissions, allocate an open file structure, 1950 * and call the device open routine if any. 1951 */ 1952 1953 int 1954 dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, 1955 register_t *retval) 1956 { 1957 file_t *fp; 1958 struct vnode *vp = NULL; 1959 kauth_cred_t cred = l->l_cred; 1960 file_t *nfp; 1961 int indx, error; 1962 struct vattr va; 1963 fhandle_t *fh; 1964 int flags; 1965 proc_t *p; 1966 1967 p = curproc; 1968 1969 /* 1970 * Must be super user 1971 */ 1972 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1973 0, NULL, NULL, NULL))) 1974 return (error); 1975 1976 if (oflags & O_SEARCH) { 1977 oflags &= ~(int)O_SEARCH; 1978 } 1979 1980 flags = FFLAGS(oflags); 1981 if ((flags & (FREAD | FWRITE)) == 0) 1982 return (EINVAL); 1983 if ((flags & O_CREAT)) 1984 return (EINVAL); 1985 if ((error = fd_allocfile(&nfp, &indx)) != 0) 1986 return (error); 1987 fp = nfp; 1988 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1989 if (error != 0) { 1990 goto bad; 1991 } 1992 error = vfs_fhtovp(fh, &vp); 1993 vfs_copyinfh_free(fh); 1994 if (error != 0) { 1995 goto bad; 1996 } 1997 1998 /* Now do an effective vn_open */ 1999 2000 if (vp->v_type == VSOCK) { 2001 error = EOPNOTSUPP; 2002 goto bad; 2003 } 2004 error = vn_openchk(vp, cred, flags); 2005 if (error != 0) 2006 goto bad; 2007 if (flags & O_TRUNC) { 2008 VOP_UNLOCK(vp); /* XXX */ 2009 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 2010 vattr_null(&va); 2011 va.va_size = 0; 2012 error = VOP_SETATTR(vp, &va, cred); 2013 if (error) 2014 goto bad; 2015 } 2016 if ((error = VOP_OPEN(vp, flags, cred)) != 0) 2017 goto bad; 2018 if (flags & FWRITE) { 2019 mutex_enter(vp->v_interlock); 2020 vp->v_writecount++; 2021 mutex_exit(vp->v_interlock); 2022 } 2023 2024 /* done with modified vn_open, now finish what sys_open does. */ 2025 if ((error = open_setfp(l, fp, vp, indx, flags))) 2026 return error; 2027 2028 VOP_UNLOCK(vp); 2029 *retval = indx; 2030 fd_affix(p, fp, indx); 2031 return (0); 2032 2033 bad: 2034 fd_abort(p, fp, indx); 2035 if (vp != NULL) 2036 vput(vp); 2037 return (error); 2038 } 2039 2040 int 2041 sys___fhopen40(struct lwp *l, const struct sys___fhopen40_args *uap, register_t *retval) 2042 { 2043 /* { 2044 syscallarg(const void *) fhp; 2045 syscallarg(size_t) fh_size; 2046 syscallarg(int) flags; 2047 } */ 2048 2049 return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), 2050 SCARG(uap, flags), retval); 2051 } 2052 2053 int 2054 do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb) 2055 { 2056 int error; 2057 fhandle_t *fh; 2058 struct vnode *vp; 2059 2060 /* 2061 * Must be super user 2062 */ 2063 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2064 0, NULL, NULL, NULL))) 2065 return (error); 2066 2067 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2068 if (error != 0) 2069 return error; 2070 2071 error = vfs_fhtovp(fh, &vp); 2072 vfs_copyinfh_free(fh); 2073 if (error != 0) 2074 return error; 2075 2076 error = vn_stat(vp, sb); 2077 vput(vp); 2078 return error; 2079 } 2080 2081 2082 /* ARGSUSED */ 2083 int 2084 sys___fhstat50(struct lwp *l, const struct sys___fhstat50_args *uap, register_t *retval) 2085 { 2086 /* { 2087 syscallarg(const void *) fhp; 2088 syscallarg(size_t) fh_size; 2089 syscallarg(struct stat *) sb; 2090 } */ 2091 struct stat sb; 2092 int error; 2093 2094 error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb); 2095 if (error) 2096 return error; 2097 return copyout(&sb, SCARG(uap, sb), sizeof(sb)); 2098 } 2099 2100 int 2101 do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb, 2102 int flags) 2103 { 2104 fhandle_t *fh; 2105 struct mount *mp; 2106 struct vnode *vp; 2107 int error; 2108 2109 /* 2110 * Must be super user 2111 */ 2112 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 2113 0, NULL, NULL, NULL))) 2114 return error; 2115 2116 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 2117 if (error != 0) 2118 return error; 2119 2120 error = vfs_fhtovp(fh, &vp); 2121 vfs_copyinfh_free(fh); 2122 if (error != 0) 2123 return error; 2124 2125 mp = vp->v_mount; 2126 error = dostatvfs(mp, sb, l, flags, 1); 2127 vput(vp); 2128 return error; 2129 } 2130 2131 /* ARGSUSED */ 2132 int 2133 sys___fhstatvfs140(struct lwp *l, const struct sys___fhstatvfs140_args *uap, register_t *retval) 2134 { 2135 /* { 2136 syscallarg(const void *) fhp; 2137 syscallarg(size_t) fh_size; 2138 syscallarg(struct statvfs *) buf; 2139 syscallarg(int) flags; 2140 } */ 2141 struct statvfs *sb = STATVFSBUF_GET(); 2142 int error; 2143 2144 error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb, 2145 SCARG(uap, flags)); 2146 if (error == 0) 2147 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 2148 STATVFSBUF_PUT(sb); 2149 return error; 2150 } 2151 2152 int 2153 do_posix_mknodat(struct lwp *l, int fdat, const char *pathname, mode_t mode, 2154 dev_t dev) 2155 { 2156 2157 /* 2158 * The POSIX mknod(2) call is an alias for mkfifo(2) for S_IFIFO 2159 * in mode and dev=0. 2160 * 2161 * In all the other cases it's implementation defined behavior. 2162 */ 2163 2164 if ((mode & S_IFIFO) && dev == 0) 2165 return do_sys_mkfifoat(l, fdat, pathname, mode); 2166 else 2167 return do_sys_mknodat(l, fdat, pathname, mode, dev, 2168 UIO_USERSPACE); 2169 } 2170 2171 /* 2172 * Create a special file. 2173 */ 2174 /* ARGSUSED */ 2175 int 2176 sys___mknod50(struct lwp *l, const struct sys___mknod50_args *uap, 2177 register_t *retval) 2178 { 2179 /* { 2180 syscallarg(const char *) path; 2181 syscallarg(mode_t) mode; 2182 syscallarg(dev_t) dev; 2183 } */ 2184 return do_posix_mknodat(l, AT_FDCWD, SCARG(uap, path), 2185 SCARG(uap, mode), SCARG(uap, dev)); 2186 } 2187 2188 int 2189 sys_mknodat(struct lwp *l, const struct sys_mknodat_args *uap, 2190 register_t *retval) 2191 { 2192 /* { 2193 syscallarg(int) fd; 2194 syscallarg(const char *) path; 2195 syscallarg(mode_t) mode; 2196 syscallarg(int) pad; 2197 syscallarg(dev_t) dev; 2198 } */ 2199 2200 return do_posix_mknodat(l, SCARG(uap, fd), SCARG(uap, path), 2201 SCARG(uap, mode), SCARG(uap, dev)); 2202 } 2203 2204 int 2205 do_sys_mknod(struct lwp *l, const char *pathname, mode_t mode, dev_t dev, 2206 enum uio_seg seg) 2207 { 2208 return do_sys_mknodat(l, AT_FDCWD, pathname, mode, dev, seg); 2209 } 2210 2211 int 2212 do_sys_mknodat(struct lwp *l, int fdat, const char *pathname, mode_t mode, 2213 dev_t dev, enum uio_seg seg) 2214 { 2215 struct proc *p = l->l_proc; 2216 struct vnode *vp; 2217 struct vattr vattr; 2218 int error, optype; 2219 struct pathbuf *pb; 2220 struct nameidata nd; 2221 const char *pathstring; 2222 2223 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 2224 0, NULL, NULL, NULL)) != 0) 2225 return (error); 2226 2227 optype = VOP_MKNOD_DESCOFFSET; 2228 2229 error = pathbuf_maybe_copyin(pathname, seg, &pb); 2230 if (error) { 2231 return error; 2232 } 2233 pathstring = pathbuf_stringcopy_get(pb); 2234 if (pathstring == NULL) { 2235 pathbuf_destroy(pb); 2236 return ENOMEM; 2237 } 2238 2239 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2240 2241 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2242 goto out; 2243 vp = nd.ni_vp; 2244 2245 if (vp != NULL) 2246 error = EEXIST; 2247 else { 2248 vattr_null(&vattr); 2249 /* We will read cwdi->cwdi_cmask unlocked. */ 2250 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2251 vattr.va_rdev = dev; 2252 2253 switch (mode & S_IFMT) { 2254 case S_IFMT: /* used by badsect to flag bad sectors */ 2255 vattr.va_type = VBAD; 2256 break; 2257 case S_IFCHR: 2258 vattr.va_type = VCHR; 2259 break; 2260 case S_IFBLK: 2261 vattr.va_type = VBLK; 2262 break; 2263 case S_IFWHT: 2264 optype = VOP_WHITEOUT_DESCOFFSET; 2265 break; 2266 case S_IFREG: 2267 #if NVERIEXEC > 0 2268 error = veriexec_openchk(l, nd.ni_vp, pathstring, 2269 O_CREAT); 2270 #endif /* NVERIEXEC > 0 */ 2271 vattr.va_type = VREG; 2272 vattr.va_rdev = VNOVAL; 2273 optype = VOP_CREATE_DESCOFFSET; 2274 break; 2275 default: 2276 error = EINVAL; 2277 break; 2278 } 2279 } 2280 if (error == 0 && optype == VOP_MKNOD_DESCOFFSET 2281 && vattr.va_rdev == VNOVAL) 2282 error = EINVAL; 2283 if (!error) { 2284 switch (optype) { 2285 case VOP_WHITEOUT_DESCOFFSET: 2286 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 2287 if (error) 2288 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2289 vput(nd.ni_dvp); 2290 break; 2291 2292 case VOP_MKNOD_DESCOFFSET: 2293 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 2294 &nd.ni_cnd, &vattr); 2295 if (error == 0) 2296 vrele(nd.ni_vp); 2297 vput(nd.ni_dvp); 2298 break; 2299 2300 case VOP_CREATE_DESCOFFSET: 2301 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, 2302 &nd.ni_cnd, &vattr); 2303 if (error == 0) 2304 vrele(nd.ni_vp); 2305 vput(nd.ni_dvp); 2306 break; 2307 } 2308 } else { 2309 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2310 if (nd.ni_dvp == vp) 2311 vrele(nd.ni_dvp); 2312 else 2313 vput(nd.ni_dvp); 2314 if (vp) 2315 vrele(vp); 2316 } 2317 out: 2318 pathbuf_stringcopy_put(pb, pathstring); 2319 pathbuf_destroy(pb); 2320 return (error); 2321 } 2322 2323 /* 2324 * Create a named pipe. 2325 */ 2326 /* ARGSUSED */ 2327 int 2328 sys_mkfifo(struct lwp *l, const struct sys_mkfifo_args *uap, register_t *retval) 2329 { 2330 /* { 2331 syscallarg(const char *) path; 2332 syscallarg(int) mode; 2333 } */ 2334 return do_sys_mkfifoat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap, mode)); 2335 } 2336 2337 int 2338 sys_mkfifoat(struct lwp *l, const struct sys_mkfifoat_args *uap, 2339 register_t *retval) 2340 { 2341 /* { 2342 syscallarg(int) fd; 2343 syscallarg(const char *) path; 2344 syscallarg(int) mode; 2345 } */ 2346 2347 return do_sys_mkfifoat(l, SCARG(uap, fd), SCARG(uap, path), 2348 SCARG(uap, mode)); 2349 } 2350 2351 static int 2352 do_sys_mkfifoat(struct lwp *l, int fdat, const char *path, mode_t mode) 2353 { 2354 struct proc *p = l->l_proc; 2355 struct vattr vattr; 2356 int error; 2357 struct pathbuf *pb; 2358 struct nameidata nd; 2359 2360 error = pathbuf_copyin(path, &pb); 2361 if (error) { 2362 return error; 2363 } 2364 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, pb); 2365 2366 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 2367 pathbuf_destroy(pb); 2368 return error; 2369 } 2370 if (nd.ni_vp != NULL) { 2371 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2372 if (nd.ni_dvp == nd.ni_vp) 2373 vrele(nd.ni_dvp); 2374 else 2375 vput(nd.ni_dvp); 2376 vrele(nd.ni_vp); 2377 pathbuf_destroy(pb); 2378 return (EEXIST); 2379 } 2380 vattr_null(&vattr); 2381 vattr.va_type = VFIFO; 2382 /* We will read cwdi->cwdi_cmask unlocked. */ 2383 vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 2384 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2385 if (error == 0) 2386 vrele(nd.ni_vp); 2387 vput(nd.ni_dvp); 2388 pathbuf_destroy(pb); 2389 return (error); 2390 } 2391 2392 /* 2393 * Make a hard file link. 2394 */ 2395 /* ARGSUSED */ 2396 int 2397 do_sys_linkat(struct lwp *l, int fdpath, const char *path, int fdlink, 2398 const char *link, int follow, register_t *retval) 2399 { 2400 struct vnode *vp; 2401 struct pathbuf *linkpb; 2402 struct nameidata nd; 2403 namei_simple_flags_t ns_flags; 2404 int error; 2405 2406 if (follow & AT_SYMLINK_FOLLOW) 2407 ns_flags = NSM_FOLLOW_TRYEMULROOT; 2408 else 2409 ns_flags = NSM_NOFOLLOW_TRYEMULROOT; 2410 2411 error = fd_nameiat_simple_user(l, fdpath, path, ns_flags, &vp); 2412 if (error != 0) 2413 return (error); 2414 error = pathbuf_copyin(link, &linkpb); 2415 if (error) { 2416 goto out1; 2417 } 2418 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2419 if ((error = fd_nameiat(l, fdlink, &nd)) != 0) 2420 goto out2; 2421 if (nd.ni_vp) { 2422 error = EEXIST; 2423 goto abortop; 2424 } 2425 /* Prevent hard links on directories. */ 2426 if (vp->v_type == VDIR) { 2427 error = EPERM; 2428 goto abortop; 2429 } 2430 /* Prevent cross-mount operation. */ 2431 if (nd.ni_dvp->v_mount != vp->v_mount) { 2432 error = EXDEV; 2433 goto abortop; 2434 } 2435 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 2436 VOP_UNLOCK(nd.ni_dvp); 2437 vrele(nd.ni_dvp); 2438 out2: 2439 pathbuf_destroy(linkpb); 2440 out1: 2441 vrele(vp); 2442 return (error); 2443 abortop: 2444 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2445 if (nd.ni_dvp == nd.ni_vp) 2446 vrele(nd.ni_dvp); 2447 else 2448 vput(nd.ni_dvp); 2449 if (nd.ni_vp != NULL) 2450 vrele(nd.ni_vp); 2451 goto out2; 2452 } 2453 2454 int 2455 sys_link(struct lwp *l, const struct sys_link_args *uap, register_t *retval) 2456 { 2457 /* { 2458 syscallarg(const char *) path; 2459 syscallarg(const char *) link; 2460 } */ 2461 const char *path = SCARG(uap, path); 2462 const char *link = SCARG(uap, link); 2463 2464 return do_sys_linkat(l, AT_FDCWD, path, AT_FDCWD, link, 2465 AT_SYMLINK_FOLLOW, retval); 2466 } 2467 2468 int 2469 sys_linkat(struct lwp *l, const struct sys_linkat_args *uap, 2470 register_t *retval) 2471 { 2472 /* { 2473 syscallarg(int) fd1; 2474 syscallarg(const char *) name1; 2475 syscallarg(int) fd2; 2476 syscallarg(const char *) name2; 2477 syscallarg(int) flags; 2478 } */ 2479 int fd1 = SCARG(uap, fd1); 2480 const char *name1 = SCARG(uap, name1); 2481 int fd2 = SCARG(uap, fd2); 2482 const char *name2 = SCARG(uap, name2); 2483 int follow; 2484 2485 follow = SCARG(uap, flags) & AT_SYMLINK_FOLLOW; 2486 2487 return do_sys_linkat(l, fd1, name1, fd2, name2, follow, retval); 2488 } 2489 2490 2491 int 2492 do_sys_symlink(const char *patharg, const char *link, enum uio_seg seg) 2493 { 2494 return do_sys_symlinkat(NULL, patharg, AT_FDCWD, link, seg); 2495 } 2496 2497 static int 2498 do_sys_symlinkat(struct lwp *l, const char *patharg, int fdat, 2499 const char *link, enum uio_seg seg) 2500 { 2501 struct proc *p = curproc; 2502 struct vattr vattr; 2503 char *path; 2504 int error; 2505 size_t len; 2506 struct pathbuf *linkpb; 2507 struct nameidata nd; 2508 2509 KASSERT(l != NULL || fdat == AT_FDCWD); 2510 2511 path = PNBUF_GET(); 2512 if (seg == UIO_USERSPACE) { 2513 if ((error = copyinstr(patharg, path, MAXPATHLEN, &len)) != 0) 2514 goto out1; 2515 if ((error = pathbuf_copyin(link, &linkpb)) != 0) 2516 goto out1; 2517 } else { 2518 len = strlen(patharg) + 1; 2519 KASSERT(len <= MAXPATHLEN); 2520 memcpy(path, patharg, len); 2521 linkpb = pathbuf_create(link); 2522 if (linkpb == NULL) { 2523 error = ENOMEM; 2524 goto out1; 2525 } 2526 } 2527 ktrkuser("symlink-target", path, len - 1); 2528 2529 NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, linkpb); 2530 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2531 goto out2; 2532 if (nd.ni_vp) { 2533 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2534 if (nd.ni_dvp == nd.ni_vp) 2535 vrele(nd.ni_dvp); 2536 else 2537 vput(nd.ni_dvp); 2538 vrele(nd.ni_vp); 2539 error = EEXIST; 2540 goto out2; 2541 } 2542 vattr_null(&vattr); 2543 vattr.va_type = VLNK; 2544 /* We will read cwdi->cwdi_cmask unlocked. */ 2545 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 2546 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 2547 if (error == 0) 2548 vrele(nd.ni_vp); 2549 vput(nd.ni_dvp); 2550 out2: 2551 pathbuf_destroy(linkpb); 2552 out1: 2553 PNBUF_PUT(path); 2554 return (error); 2555 } 2556 2557 /* 2558 * Make a symbolic link. 2559 */ 2560 /* ARGSUSED */ 2561 int 2562 sys_symlink(struct lwp *l, const struct sys_symlink_args *uap, register_t *retval) 2563 { 2564 /* { 2565 syscallarg(const char *) path; 2566 syscallarg(const char *) link; 2567 } */ 2568 2569 return do_sys_symlinkat(l, SCARG(uap, path), AT_FDCWD, SCARG(uap, link), 2570 UIO_USERSPACE); 2571 } 2572 2573 int 2574 sys_symlinkat(struct lwp *l, const struct sys_symlinkat_args *uap, 2575 register_t *retval) 2576 { 2577 /* { 2578 syscallarg(const char *) path1; 2579 syscallarg(int) fd; 2580 syscallarg(const char *) path2; 2581 } */ 2582 2583 return do_sys_symlinkat(l, SCARG(uap, path1), SCARG(uap, fd), 2584 SCARG(uap, path2), UIO_USERSPACE); 2585 } 2586 2587 /* 2588 * Delete a whiteout from the filesystem. 2589 */ 2590 /* ARGSUSED */ 2591 int 2592 sys_undelete(struct lwp *l, const struct sys_undelete_args *uap, register_t *retval) 2593 { 2594 /* { 2595 syscallarg(const char *) path; 2596 } */ 2597 int error; 2598 struct pathbuf *pb; 2599 struct nameidata nd; 2600 2601 error = pathbuf_copyin(SCARG(uap, path), &pb); 2602 if (error) { 2603 return error; 2604 } 2605 2606 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT, pb); 2607 error = namei(&nd); 2608 if (error) { 2609 pathbuf_destroy(pb); 2610 return (error); 2611 } 2612 2613 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 2614 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2615 if (nd.ni_dvp == nd.ni_vp) 2616 vrele(nd.ni_dvp); 2617 else 2618 vput(nd.ni_dvp); 2619 if (nd.ni_vp) 2620 vrele(nd.ni_vp); 2621 pathbuf_destroy(pb); 2622 return (EEXIST); 2623 } 2624 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 2625 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2626 vput(nd.ni_dvp); 2627 pathbuf_destroy(pb); 2628 return (error); 2629 } 2630 2631 /* 2632 * Delete a name from the filesystem. 2633 */ 2634 /* ARGSUSED */ 2635 int 2636 sys_unlink(struct lwp *l, const struct sys_unlink_args *uap, register_t *retval) 2637 { 2638 /* { 2639 syscallarg(const char *) path; 2640 } */ 2641 2642 return do_sys_unlinkat(l, AT_FDCWD, SCARG(uap, path), 0, UIO_USERSPACE); 2643 } 2644 2645 int 2646 sys_unlinkat(struct lwp *l, const struct sys_unlinkat_args *uap, 2647 register_t *retval) 2648 { 2649 /* { 2650 syscallarg(int) fd; 2651 syscallarg(const char *) path; 2652 syscallarg(int) flag; 2653 } */ 2654 2655 return do_sys_unlinkat(l, SCARG(uap, fd), SCARG(uap, path), 2656 SCARG(uap, flag), UIO_USERSPACE); 2657 } 2658 2659 int 2660 do_sys_unlink(const char *arg, enum uio_seg seg) 2661 { 2662 return do_sys_unlinkat(NULL, AT_FDCWD, arg, 0, seg); 2663 } 2664 2665 static int 2666 do_sys_unlinkat(struct lwp *l, int fdat, const char *arg, int flags, 2667 enum uio_seg seg) 2668 { 2669 struct vnode *vp; 2670 int error; 2671 struct pathbuf *pb; 2672 struct nameidata nd; 2673 const char *pathstring; 2674 2675 KASSERT(l != NULL || fdat == AT_FDCWD); 2676 2677 error = pathbuf_maybe_copyin(arg, seg, &pb); 2678 if (error) { 2679 return error; 2680 } 2681 pathstring = pathbuf_stringcopy_get(pb); 2682 if (pathstring == NULL) { 2683 pathbuf_destroy(pb); 2684 return ENOMEM; 2685 } 2686 2687 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, pb); 2688 if ((error = fd_nameiat(l, fdat, &nd)) != 0) 2689 goto out; 2690 vp = nd.ni_vp; 2691 2692 /* 2693 * The root of a mounted filesystem cannot be deleted. 2694 */ 2695 if ((vp->v_vflag & VV_ROOT) != 0) { 2696 error = EBUSY; 2697 goto abort; 2698 } 2699 2700 if ((vp->v_type == VDIR) && (vp->v_mountedhere != NULL)) { 2701 error = EBUSY; 2702 goto abort; 2703 } 2704 2705 /* 2706 * No rmdir "." please. 2707 */ 2708 if (nd.ni_dvp == vp) { 2709 error = EINVAL; 2710 goto abort; 2711 } 2712 2713 /* 2714 * AT_REMOVEDIR is required to remove a directory 2715 */ 2716 if (vp->v_type == VDIR) { 2717 if (!(flags & AT_REMOVEDIR)) { 2718 error = EPERM; 2719 goto abort; 2720 } else { 2721 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2722 vput(nd.ni_dvp); 2723 goto out; 2724 } 2725 } 2726 2727 /* 2728 * Starting here we only deal with non directories. 2729 */ 2730 if (flags & AT_REMOVEDIR) { 2731 error = ENOTDIR; 2732 goto abort; 2733 } 2734 2735 #if NVERIEXEC > 0 2736 /* Handle remove requests for veriexec entries. */ 2737 if ((error = veriexec_removechk(curlwp, nd.ni_vp, pathstring)) != 0) { 2738 goto abort; 2739 } 2740 #endif /* NVERIEXEC > 0 */ 2741 2742 #ifdef FILEASSOC 2743 (void)fileassoc_file_delete(vp); 2744 #endif /* FILEASSOC */ 2745 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2746 vput(nd.ni_dvp); 2747 goto out; 2748 2749 abort: 2750 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2751 if (nd.ni_dvp == vp) 2752 vrele(nd.ni_dvp); 2753 else 2754 vput(nd.ni_dvp); 2755 vput(vp); 2756 2757 out: 2758 pathbuf_stringcopy_put(pb, pathstring); 2759 pathbuf_destroy(pb); 2760 return (error); 2761 } 2762 2763 /* 2764 * Reposition read/write file offset. 2765 */ 2766 int 2767 sys_lseek(struct lwp *l, const struct sys_lseek_args *uap, register_t *retval) 2768 { 2769 /* { 2770 syscallarg(int) fd; 2771 syscallarg(int) pad; 2772 syscallarg(off_t) offset; 2773 syscallarg(int) whence; 2774 } */ 2775 kauth_cred_t cred = l->l_cred; 2776 file_t *fp; 2777 struct vnode *vp; 2778 struct vattr vattr; 2779 off_t newoff; 2780 int error, fd; 2781 2782 fd = SCARG(uap, fd); 2783 2784 if ((fp = fd_getfile(fd)) == NULL) 2785 return (EBADF); 2786 2787 vp = fp->f_vnode; 2788 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2789 error = ESPIPE; 2790 goto out; 2791 } 2792 2793 vn_lock(vp, LK_SHARED | LK_RETRY); 2794 2795 switch (SCARG(uap, whence)) { 2796 case SEEK_CUR: 2797 newoff = fp->f_offset + SCARG(uap, offset); 2798 break; 2799 case SEEK_END: 2800 error = VOP_GETATTR(vp, &vattr, cred); 2801 if (error) { 2802 VOP_UNLOCK(vp); 2803 goto out; 2804 } 2805 newoff = SCARG(uap, offset) + vattr.va_size; 2806 break; 2807 case SEEK_SET: 2808 newoff = SCARG(uap, offset); 2809 break; 2810 default: 2811 error = EINVAL; 2812 VOP_UNLOCK(vp); 2813 goto out; 2814 } 2815 VOP_UNLOCK(vp); 2816 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) == 0) { 2817 *(off_t *)retval = fp->f_offset = newoff; 2818 } 2819 out: 2820 fd_putfile(fd); 2821 return (error); 2822 } 2823 2824 /* 2825 * Positional read system call. 2826 */ 2827 int 2828 sys_pread(struct lwp *l, const struct sys_pread_args *uap, register_t *retval) 2829 { 2830 /* { 2831 syscallarg(int) fd; 2832 syscallarg(void *) buf; 2833 syscallarg(size_t) nbyte; 2834 syscallarg(off_t) offset; 2835 } */ 2836 file_t *fp; 2837 struct vnode *vp; 2838 off_t offset; 2839 int error, fd = SCARG(uap, fd); 2840 2841 if ((fp = fd_getfile(fd)) == NULL) 2842 return (EBADF); 2843 2844 if ((fp->f_flag & FREAD) == 0) { 2845 fd_putfile(fd); 2846 return (EBADF); 2847 } 2848 2849 vp = fp->f_vnode; 2850 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2851 error = ESPIPE; 2852 goto out; 2853 } 2854 2855 offset = SCARG(uap, offset); 2856 2857 /* 2858 * XXX This works because no file systems actually 2859 * XXX take any action on the seek operation. 2860 */ 2861 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2862 goto out; 2863 2864 /* dofileread() will unuse the descriptor for us */ 2865 return (dofileread(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2866 &offset, 0, retval)); 2867 2868 out: 2869 fd_putfile(fd); 2870 return (error); 2871 } 2872 2873 /* 2874 * Positional scatter read system call. 2875 */ 2876 int 2877 sys_preadv(struct lwp *l, const struct sys_preadv_args *uap, register_t *retval) 2878 { 2879 /* { 2880 syscallarg(int) fd; 2881 syscallarg(const struct iovec *) iovp; 2882 syscallarg(int) iovcnt; 2883 syscallarg(off_t) offset; 2884 } */ 2885 off_t offset = SCARG(uap, offset); 2886 2887 return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp), 2888 SCARG(uap, iovcnt), &offset, 0, retval); 2889 } 2890 2891 /* 2892 * Positional write system call. 2893 */ 2894 int 2895 sys_pwrite(struct lwp *l, const struct sys_pwrite_args *uap, register_t *retval) 2896 { 2897 /* { 2898 syscallarg(int) fd; 2899 syscallarg(const void *) buf; 2900 syscallarg(size_t) nbyte; 2901 syscallarg(off_t) offset; 2902 } */ 2903 file_t *fp; 2904 struct vnode *vp; 2905 off_t offset; 2906 int error, fd = SCARG(uap, fd); 2907 2908 if ((fp = fd_getfile(fd)) == NULL) 2909 return (EBADF); 2910 2911 if ((fp->f_flag & FWRITE) == 0) { 2912 fd_putfile(fd); 2913 return (EBADF); 2914 } 2915 2916 vp = fp->f_vnode; 2917 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2918 error = ESPIPE; 2919 goto out; 2920 } 2921 2922 offset = SCARG(uap, offset); 2923 2924 /* 2925 * XXX This works because no file systems actually 2926 * XXX take any action on the seek operation. 2927 */ 2928 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2929 goto out; 2930 2931 /* dofilewrite() will unuse the descriptor for us */ 2932 return (dofilewrite(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2933 &offset, 0, retval)); 2934 2935 out: 2936 fd_putfile(fd); 2937 return (error); 2938 } 2939 2940 /* 2941 * Positional gather write system call. 2942 */ 2943 int 2944 sys_pwritev(struct lwp *l, const struct sys_pwritev_args *uap, register_t *retval) 2945 { 2946 /* { 2947 syscallarg(int) fd; 2948 syscallarg(const struct iovec *) iovp; 2949 syscallarg(int) iovcnt; 2950 syscallarg(off_t) offset; 2951 } */ 2952 off_t offset = SCARG(uap, offset); 2953 2954 return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp), 2955 SCARG(uap, iovcnt), &offset, 0, retval); 2956 } 2957 2958 /* 2959 * Check access permissions. 2960 */ 2961 int 2962 sys_access(struct lwp *l, const struct sys_access_args *uap, register_t *retval) 2963 { 2964 /* { 2965 syscallarg(const char *) path; 2966 syscallarg(int) flags; 2967 } */ 2968 2969 return do_sys_accessat(l, AT_FDCWD, SCARG(uap, path), 2970 SCARG(uap, flags), 0); 2971 } 2972 2973 int 2974 do_sys_accessat(struct lwp *l, int fdat, const char *path, 2975 int mode, int flags) 2976 { 2977 kauth_cred_t cred; 2978 struct vnode *vp; 2979 int error, nd_flag, vmode; 2980 struct pathbuf *pb; 2981 struct nameidata nd; 2982 2983 CTASSERT(F_OK == 0); 2984 if ((mode & ~(R_OK | W_OK | X_OK)) != 0) { 2985 /* nonsense mode */ 2986 return EINVAL; 2987 } 2988 2989 nd_flag = FOLLOW | LOCKLEAF | TRYEMULROOT; 2990 if (flags & AT_SYMLINK_NOFOLLOW) 2991 nd_flag &= ~FOLLOW; 2992 2993 error = pathbuf_copyin(path, &pb); 2994 if (error) 2995 return error; 2996 2997 NDINIT(&nd, LOOKUP, nd_flag, pb); 2998 2999 /* Override default credentials */ 3000 cred = kauth_cred_dup(l->l_cred); 3001 if (!(flags & AT_EACCESS)) { 3002 kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); 3003 kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); 3004 } 3005 nd.ni_cnd.cn_cred = cred; 3006 3007 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 3008 pathbuf_destroy(pb); 3009 goto out; 3010 } 3011 vp = nd.ni_vp; 3012 pathbuf_destroy(pb); 3013 3014 /* Flags == 0 means only check for existence. */ 3015 if (mode) { 3016 vmode = 0; 3017 if (mode & R_OK) 3018 vmode |= VREAD; 3019 if (mode & W_OK) 3020 vmode |= VWRITE; 3021 if (mode & X_OK) 3022 vmode |= VEXEC; 3023 3024 error = VOP_ACCESS(vp, vmode, cred); 3025 if (!error && (vmode & VWRITE)) 3026 error = vn_writechk(vp); 3027 } 3028 vput(vp); 3029 out: 3030 kauth_cred_free(cred); 3031 return (error); 3032 } 3033 3034 int 3035 sys_faccessat(struct lwp *l, const struct sys_faccessat_args *uap, 3036 register_t *retval) 3037 { 3038 /* { 3039 syscallarg(int) fd; 3040 syscallarg(const char *) path; 3041 syscallarg(int) amode; 3042 syscallarg(int) flag; 3043 } */ 3044 3045 return do_sys_accessat(l, SCARG(uap, fd), SCARG(uap, path), 3046 SCARG(uap, amode), SCARG(uap, flag)); 3047 } 3048 3049 /* 3050 * Common code for all sys_stat functions, including compat versions. 3051 */ 3052 int 3053 do_sys_stat(const char *userpath, unsigned int nd_flag, 3054 struct stat *sb) 3055 { 3056 return do_sys_statat(NULL, AT_FDCWD, userpath, nd_flag, sb); 3057 } 3058 3059 int 3060 do_sys_statat(struct lwp *l, int fdat, const char *userpath, 3061 unsigned int nd_flag, struct stat *sb) 3062 { 3063 int error; 3064 struct pathbuf *pb; 3065 struct nameidata nd; 3066 3067 KASSERT(l != NULL || fdat == AT_FDCWD); 3068 3069 error = pathbuf_copyin(userpath, &pb); 3070 if (error) { 3071 return error; 3072 } 3073 3074 NDINIT(&nd, LOOKUP, nd_flag | LOCKLEAF | TRYEMULROOT, pb); 3075 3076 error = fd_nameiat(l, fdat, &nd); 3077 if (error != 0) { 3078 pathbuf_destroy(pb); 3079 return error; 3080 } 3081 error = vn_stat(nd.ni_vp, sb); 3082 vput(nd.ni_vp); 3083 pathbuf_destroy(pb); 3084 return error; 3085 } 3086 3087 /* 3088 * Get file status; this version follows links. 3089 */ 3090 /* ARGSUSED */ 3091 int 3092 sys___stat50(struct lwp *l, const struct sys___stat50_args *uap, register_t *retval) 3093 { 3094 /* { 3095 syscallarg(const char *) path; 3096 syscallarg(struct stat *) ub; 3097 } */ 3098 struct stat sb; 3099 int error; 3100 3101 error = do_sys_statat(l, AT_FDCWD, SCARG(uap, path), FOLLOW, &sb); 3102 if (error) 3103 return error; 3104 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 3105 } 3106 3107 /* 3108 * Get file status; this version does not follow links. 3109 */ 3110 /* ARGSUSED */ 3111 int 3112 sys___lstat50(struct lwp *l, const struct sys___lstat50_args *uap, register_t *retval) 3113 { 3114 /* { 3115 syscallarg(const char *) path; 3116 syscallarg(struct stat *) ub; 3117 } */ 3118 struct stat sb; 3119 int error; 3120 3121 error = do_sys_statat(l, AT_FDCWD, SCARG(uap, path), NOFOLLOW, &sb); 3122 if (error) 3123 return error; 3124 return copyout(&sb, SCARG(uap, ub), sizeof(sb)); 3125 } 3126 3127 int 3128 sys_fstatat(struct lwp *l, const struct sys_fstatat_args *uap, 3129 register_t *retval) 3130 { 3131 /* { 3132 syscallarg(int) fd; 3133 syscallarg(const char *) path; 3134 syscallarg(struct stat *) buf; 3135 syscallarg(int) flag; 3136 } */ 3137 unsigned int nd_flag; 3138 struct stat sb; 3139 int error; 3140 3141 if (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) 3142 nd_flag = NOFOLLOW; 3143 else 3144 nd_flag = FOLLOW; 3145 3146 error = do_sys_statat(l, SCARG(uap, fd), SCARG(uap, path), nd_flag, 3147 &sb); 3148 if (error) 3149 return error; 3150 return copyout(&sb, SCARG(uap, buf), sizeof(sb)); 3151 } 3152 3153 /* 3154 * Get configurable pathname variables. 3155 */ 3156 /* ARGSUSED */ 3157 int 3158 sys_pathconf(struct lwp *l, const struct sys_pathconf_args *uap, register_t *retval) 3159 { 3160 /* { 3161 syscallarg(const char *) path; 3162 syscallarg(int) name; 3163 } */ 3164 int error; 3165 struct pathbuf *pb; 3166 struct nameidata nd; 3167 3168 error = pathbuf_copyin(SCARG(uap, path), &pb); 3169 if (error) { 3170 return error; 3171 } 3172 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 3173 if ((error = namei(&nd)) != 0) { 3174 pathbuf_destroy(pb); 3175 return (error); 3176 } 3177 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 3178 vput(nd.ni_vp); 3179 pathbuf_destroy(pb); 3180 return (error); 3181 } 3182 3183 /* 3184 * Return target name of a symbolic link. 3185 */ 3186 /* ARGSUSED */ 3187 int 3188 sys_readlink(struct lwp *l, const struct sys_readlink_args *uap, 3189 register_t *retval) 3190 { 3191 /* { 3192 syscallarg(const char *) path; 3193 syscallarg(char *) buf; 3194 syscallarg(size_t) count; 3195 } */ 3196 return do_sys_readlinkat(l, AT_FDCWD, SCARG(uap, path), 3197 SCARG(uap, buf), SCARG(uap, count), retval); 3198 } 3199 3200 static int 3201 do_sys_readlinkat(struct lwp *l, int fdat, const char *path, char *buf, 3202 size_t count, register_t *retval) 3203 { 3204 struct vnode *vp; 3205 struct iovec aiov; 3206 struct uio auio; 3207 int error; 3208 struct pathbuf *pb; 3209 struct nameidata nd; 3210 3211 error = pathbuf_copyin(path, &pb); 3212 if (error) { 3213 return error; 3214 } 3215 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, pb); 3216 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 3217 pathbuf_destroy(pb); 3218 return error; 3219 } 3220 vp = nd.ni_vp; 3221 pathbuf_destroy(pb); 3222 if (vp->v_type != VLNK) 3223 error = EINVAL; 3224 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 3225 (error = VOP_ACCESS(vp, VREAD, l->l_cred)) == 0) { 3226 aiov.iov_base = buf; 3227 aiov.iov_len = count; 3228 auio.uio_iov = &aiov; 3229 auio.uio_iovcnt = 1; 3230 auio.uio_offset = 0; 3231 auio.uio_rw = UIO_READ; 3232 KASSERT(l == curlwp); 3233 auio.uio_vmspace = l->l_proc->p_vmspace; 3234 auio.uio_resid = count; 3235 if ((error = VOP_READLINK(vp, &auio, l->l_cred)) == 0) 3236 *retval = count - auio.uio_resid; 3237 } 3238 vput(vp); 3239 return (error); 3240 } 3241 3242 int 3243 sys_readlinkat(struct lwp *l, const struct sys_readlinkat_args *uap, 3244 register_t *retval) 3245 { 3246 /* { 3247 syscallarg(int) fd; 3248 syscallarg(const char *) path; 3249 syscallarg(char *) buf; 3250 syscallarg(size_t) bufsize; 3251 } */ 3252 3253 return do_sys_readlinkat(l, SCARG(uap, fd), SCARG(uap, path), 3254 SCARG(uap, buf), SCARG(uap, bufsize), retval); 3255 } 3256 3257 /* 3258 * Change flags of a file given a path name. 3259 */ 3260 /* ARGSUSED */ 3261 int 3262 sys_chflags(struct lwp *l, const struct sys_chflags_args *uap, register_t *retval) 3263 { 3264 /* { 3265 syscallarg(const char *) path; 3266 syscallarg(u_long) flags; 3267 } */ 3268 struct vnode *vp; 3269 int error; 3270 3271 error = namei_simple_user(SCARG(uap, path), 3272 NSM_FOLLOW_TRYEMULROOT, &vp); 3273 if (error != 0) 3274 return (error); 3275 error = change_flags(vp, SCARG(uap, flags), l); 3276 vput(vp); 3277 return (error); 3278 } 3279 3280 /* 3281 * Change flags of a file given a file descriptor. 3282 */ 3283 /* ARGSUSED */ 3284 int 3285 sys_fchflags(struct lwp *l, const struct sys_fchflags_args *uap, register_t *retval) 3286 { 3287 /* { 3288 syscallarg(int) fd; 3289 syscallarg(u_long) flags; 3290 } */ 3291 struct vnode *vp; 3292 file_t *fp; 3293 int error; 3294 3295 /* fd_getvnode() will use the descriptor for us */ 3296 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3297 return (error); 3298 vp = fp->f_vnode; 3299 error = change_flags(vp, SCARG(uap, flags), l); 3300 VOP_UNLOCK(vp); 3301 fd_putfile(SCARG(uap, fd)); 3302 return (error); 3303 } 3304 3305 /* 3306 * Change flags of a file given a path name; this version does 3307 * not follow links. 3308 */ 3309 int 3310 sys_lchflags(struct lwp *l, const struct sys_lchflags_args *uap, register_t *retval) 3311 { 3312 /* { 3313 syscallarg(const char *) path; 3314 syscallarg(u_long) flags; 3315 } */ 3316 struct vnode *vp; 3317 int error; 3318 3319 error = namei_simple_user(SCARG(uap, path), 3320 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3321 if (error != 0) 3322 return (error); 3323 error = change_flags(vp, SCARG(uap, flags), l); 3324 vput(vp); 3325 return (error); 3326 } 3327 3328 /* 3329 * Common routine to change flags of a file. 3330 */ 3331 int 3332 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 3333 { 3334 struct vattr vattr; 3335 int error; 3336 3337 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3338 3339 vattr_null(&vattr); 3340 vattr.va_flags = flags; 3341 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3342 3343 return (error); 3344 } 3345 3346 /* 3347 * Change mode of a file given path name; this version follows links. 3348 */ 3349 /* ARGSUSED */ 3350 int 3351 sys_chmod(struct lwp *l, const struct sys_chmod_args *uap, register_t *retval) 3352 { 3353 /* { 3354 syscallarg(const char *) path; 3355 syscallarg(int) mode; 3356 } */ 3357 return do_sys_chmodat(l, AT_FDCWD, SCARG(uap, path), 3358 SCARG(uap, mode), 0); 3359 } 3360 3361 int 3362 do_sys_chmodat(struct lwp *l, int fdat, const char *path, int mode, int flags) 3363 { 3364 int error; 3365 struct vnode *vp; 3366 namei_simple_flags_t ns_flag; 3367 3368 if (flags & AT_SYMLINK_NOFOLLOW) 3369 ns_flag = NSM_NOFOLLOW_TRYEMULROOT; 3370 else 3371 ns_flag = NSM_FOLLOW_TRYEMULROOT; 3372 3373 error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp); 3374 if (error != 0) 3375 return error; 3376 3377 error = change_mode(vp, mode, l); 3378 3379 vrele(vp); 3380 3381 return (error); 3382 } 3383 3384 /* 3385 * Change mode of a file given a file descriptor. 3386 */ 3387 /* ARGSUSED */ 3388 int 3389 sys_fchmod(struct lwp *l, const struct sys_fchmod_args *uap, register_t *retval) 3390 { 3391 /* { 3392 syscallarg(int) fd; 3393 syscallarg(int) mode; 3394 } */ 3395 file_t *fp; 3396 int error; 3397 3398 /* fd_getvnode() will use the descriptor for us */ 3399 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3400 return (error); 3401 error = change_mode(fp->f_vnode, SCARG(uap, mode), l); 3402 fd_putfile(SCARG(uap, fd)); 3403 return (error); 3404 } 3405 3406 int 3407 sys_fchmodat(struct lwp *l, const struct sys_fchmodat_args *uap, 3408 register_t *retval) 3409 { 3410 /* { 3411 syscallarg(int) fd; 3412 syscallarg(const char *) path; 3413 syscallarg(int) mode; 3414 syscallarg(int) flag; 3415 } */ 3416 3417 return do_sys_chmodat(l, SCARG(uap, fd), SCARG(uap, path), 3418 SCARG(uap, mode), SCARG(uap, flag)); 3419 } 3420 3421 /* 3422 * Change mode of a file given path name; this version does not follow links. 3423 */ 3424 /* ARGSUSED */ 3425 int 3426 sys_lchmod(struct lwp *l, const struct sys_lchmod_args *uap, register_t *retval) 3427 { 3428 /* { 3429 syscallarg(const char *) path; 3430 syscallarg(int) mode; 3431 } */ 3432 int error; 3433 struct vnode *vp; 3434 3435 error = namei_simple_user(SCARG(uap, path), 3436 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3437 if (error != 0) 3438 return (error); 3439 3440 error = change_mode(vp, SCARG(uap, mode), l); 3441 3442 vrele(vp); 3443 return (error); 3444 } 3445 3446 /* 3447 * Common routine to set mode given a vnode. 3448 */ 3449 static int 3450 change_mode(struct vnode *vp, int mode, struct lwp *l) 3451 { 3452 struct vattr vattr; 3453 int error; 3454 3455 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3456 vattr_null(&vattr); 3457 vattr.va_mode = mode & ALLPERMS; 3458 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3459 VOP_UNLOCK(vp); 3460 return (error); 3461 } 3462 3463 /* 3464 * Set ownership given a path name; this version follows links. 3465 */ 3466 /* ARGSUSED */ 3467 int 3468 sys_chown(struct lwp *l, const struct sys_chown_args *uap, register_t *retval) 3469 { 3470 /* { 3471 syscallarg(const char *) path; 3472 syscallarg(uid_t) uid; 3473 syscallarg(gid_t) gid; 3474 } */ 3475 return do_sys_chownat(l, AT_FDCWD, SCARG(uap, path), SCARG(uap,uid), 3476 SCARG(uap, gid), 0); 3477 } 3478 3479 int 3480 do_sys_chownat(struct lwp *l, int fdat, const char *path, uid_t uid, 3481 gid_t gid, int flags) 3482 { 3483 int error; 3484 struct vnode *vp; 3485 namei_simple_flags_t ns_flag; 3486 3487 if (flags & AT_SYMLINK_NOFOLLOW) 3488 ns_flag = NSM_NOFOLLOW_TRYEMULROOT; 3489 else 3490 ns_flag = NSM_FOLLOW_TRYEMULROOT; 3491 3492 error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp); 3493 if (error != 0) 3494 return error; 3495 3496 error = change_owner(vp, uid, gid, l, 0); 3497 3498 vrele(vp); 3499 3500 return (error); 3501 } 3502 3503 /* 3504 * Set ownership given a path name; this version follows links. 3505 * Provides POSIX semantics. 3506 */ 3507 /* ARGSUSED */ 3508 int 3509 sys___posix_chown(struct lwp *l, const struct sys___posix_chown_args *uap, register_t *retval) 3510 { 3511 /* { 3512 syscallarg(const char *) path; 3513 syscallarg(uid_t) uid; 3514 syscallarg(gid_t) gid; 3515 } */ 3516 int error; 3517 struct vnode *vp; 3518 3519 error = namei_simple_user(SCARG(uap, path), 3520 NSM_FOLLOW_TRYEMULROOT, &vp); 3521 if (error != 0) 3522 return (error); 3523 3524 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3525 3526 vrele(vp); 3527 return (error); 3528 } 3529 3530 /* 3531 * Set ownership given a file descriptor. 3532 */ 3533 /* ARGSUSED */ 3534 int 3535 sys_fchown(struct lwp *l, const struct sys_fchown_args *uap, register_t *retval) 3536 { 3537 /* { 3538 syscallarg(int) fd; 3539 syscallarg(uid_t) uid; 3540 syscallarg(gid_t) gid; 3541 } */ 3542 int error; 3543 file_t *fp; 3544 3545 /* fd_getvnode() will use the descriptor for us */ 3546 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3547 return (error); 3548 error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid), 3549 l, 0); 3550 fd_putfile(SCARG(uap, fd)); 3551 return (error); 3552 } 3553 3554 int 3555 sys_fchownat(struct lwp *l, const struct sys_fchownat_args *uap, 3556 register_t *retval) 3557 { 3558 /* { 3559 syscallarg(int) fd; 3560 syscallarg(const char *) path; 3561 syscallarg(uid_t) owner; 3562 syscallarg(gid_t) group; 3563 syscallarg(int) flag; 3564 } */ 3565 3566 return do_sys_chownat(l, SCARG(uap, fd), SCARG(uap, path), 3567 SCARG(uap, owner), SCARG(uap, group), 3568 SCARG(uap, flag)); 3569 } 3570 3571 /* 3572 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 3573 */ 3574 /* ARGSUSED */ 3575 int 3576 sys___posix_fchown(struct lwp *l, const struct sys___posix_fchown_args *uap, register_t *retval) 3577 { 3578 /* { 3579 syscallarg(int) fd; 3580 syscallarg(uid_t) uid; 3581 syscallarg(gid_t) gid; 3582 } */ 3583 int error; 3584 file_t *fp; 3585 3586 /* fd_getvnode() will use the descriptor for us */ 3587 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3588 return (error); 3589 error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid), 3590 l, 1); 3591 fd_putfile(SCARG(uap, fd)); 3592 return (error); 3593 } 3594 3595 /* 3596 * Set ownership given a path name; this version does not follow links. 3597 */ 3598 /* ARGSUSED */ 3599 int 3600 sys_lchown(struct lwp *l, const struct sys_lchown_args *uap, register_t *retval) 3601 { 3602 /* { 3603 syscallarg(const char *) path; 3604 syscallarg(uid_t) uid; 3605 syscallarg(gid_t) gid; 3606 } */ 3607 int error; 3608 struct vnode *vp; 3609 3610 error = namei_simple_user(SCARG(uap, path), 3611 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3612 if (error != 0) 3613 return (error); 3614 3615 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 3616 3617 vrele(vp); 3618 return (error); 3619 } 3620 3621 /* 3622 * Set ownership given a path name; this version does not follow links. 3623 * Provides POSIX/XPG semantics. 3624 */ 3625 /* ARGSUSED */ 3626 int 3627 sys___posix_lchown(struct lwp *l, const struct sys___posix_lchown_args *uap, register_t *retval) 3628 { 3629 /* { 3630 syscallarg(const char *) path; 3631 syscallarg(uid_t) uid; 3632 syscallarg(gid_t) gid; 3633 } */ 3634 int error; 3635 struct vnode *vp; 3636 3637 error = namei_simple_user(SCARG(uap, path), 3638 NSM_NOFOLLOW_TRYEMULROOT, &vp); 3639 if (error != 0) 3640 return (error); 3641 3642 error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 3643 3644 vrele(vp); 3645 return (error); 3646 } 3647 3648 /* 3649 * Common routine to set ownership given a vnode. 3650 */ 3651 static int 3652 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 3653 int posix_semantics) 3654 { 3655 struct vattr vattr; 3656 mode_t newmode; 3657 int error; 3658 3659 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3660 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) 3661 goto out; 3662 3663 #define CHANGED(x) ((int)(x) != -1) 3664 newmode = vattr.va_mode; 3665 if (posix_semantics) { 3666 /* 3667 * POSIX/XPG semantics: if the caller is not the super-user, 3668 * clear set-user-id and set-group-id bits. Both POSIX and 3669 * the XPG consider the behaviour for calls by the super-user 3670 * implementation-defined; we leave the set-user-id and set- 3671 * group-id settings intact in that case. 3672 */ 3673 if (vattr.va_mode & S_ISUID) { 3674 if (kauth_authorize_vnode(l->l_cred, 3675 KAUTH_VNODE_RETAIN_SUID, vp, NULL, EPERM) != 0) 3676 newmode &= ~S_ISUID; 3677 } 3678 if (vattr.va_mode & S_ISGID) { 3679 if (kauth_authorize_vnode(l->l_cred, 3680 KAUTH_VNODE_RETAIN_SGID, vp, NULL, EPERM) != 0) 3681 newmode &= ~S_ISGID; 3682 } 3683 } else { 3684 /* 3685 * NetBSD semantics: when changing owner and/or group, 3686 * clear the respective bit(s). 3687 */ 3688 if (CHANGED(uid)) 3689 newmode &= ~S_ISUID; 3690 if (CHANGED(gid)) 3691 newmode &= ~S_ISGID; 3692 } 3693 /* Update va_mode iff altered. */ 3694 if (vattr.va_mode == newmode) 3695 newmode = VNOVAL; 3696 3697 vattr_null(&vattr); 3698 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 3699 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 3700 vattr.va_mode = newmode; 3701 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3702 #undef CHANGED 3703 3704 out: 3705 VOP_UNLOCK(vp); 3706 return (error); 3707 } 3708 3709 /* 3710 * Set the access and modification times given a path name; this 3711 * version follows links. 3712 */ 3713 /* ARGSUSED */ 3714 int 3715 sys___utimes50(struct lwp *l, const struct sys___utimes50_args *uap, 3716 register_t *retval) 3717 { 3718 /* { 3719 syscallarg(const char *) path; 3720 syscallarg(const struct timeval *) tptr; 3721 } */ 3722 3723 return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, 3724 SCARG(uap, tptr), UIO_USERSPACE); 3725 } 3726 3727 /* 3728 * Set the access and modification times given a file descriptor. 3729 */ 3730 /* ARGSUSED */ 3731 int 3732 sys___futimes50(struct lwp *l, const struct sys___futimes50_args *uap, 3733 register_t *retval) 3734 { 3735 /* { 3736 syscallarg(int) fd; 3737 syscallarg(const struct timeval *) tptr; 3738 } */ 3739 int error; 3740 file_t *fp; 3741 3742 /* fd_getvnode() will use the descriptor for us */ 3743 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3744 return (error); 3745 error = do_sys_utimes(l, fp->f_vnode, NULL, 0, SCARG(uap, tptr), 3746 UIO_USERSPACE); 3747 fd_putfile(SCARG(uap, fd)); 3748 return (error); 3749 } 3750 3751 int 3752 sys_futimens(struct lwp *l, const struct sys_futimens_args *uap, 3753 register_t *retval) 3754 { 3755 /* { 3756 syscallarg(int) fd; 3757 syscallarg(const struct timespec *) tptr; 3758 } */ 3759 int error; 3760 file_t *fp; 3761 3762 /* fd_getvnode() will use the descriptor for us */ 3763 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3764 return (error); 3765 error = do_sys_utimensat(l, AT_FDCWD, fp->f_vnode, NULL, 0, 3766 SCARG(uap, tptr), UIO_USERSPACE); 3767 fd_putfile(SCARG(uap, fd)); 3768 return (error); 3769 } 3770 3771 /* 3772 * Set the access and modification times given a path name; this 3773 * version does not follow links. 3774 */ 3775 int 3776 sys___lutimes50(struct lwp *l, const struct sys___lutimes50_args *uap, 3777 register_t *retval) 3778 { 3779 /* { 3780 syscallarg(const char *) path; 3781 syscallarg(const struct timeval *) tptr; 3782 } */ 3783 3784 return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW, 3785 SCARG(uap, tptr), UIO_USERSPACE); 3786 } 3787 3788 int 3789 sys_utimensat(struct lwp *l, const struct sys_utimensat_args *uap, 3790 register_t *retval) 3791 { 3792 /* { 3793 syscallarg(int) fd; 3794 syscallarg(const char *) path; 3795 syscallarg(const struct timespec *) tptr; 3796 syscallarg(int) flag; 3797 } */ 3798 int follow; 3799 const struct timespec *tptr; 3800 int error; 3801 3802 tptr = SCARG(uap, tptr); 3803 follow = (SCARG(uap, flag) & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 3804 3805 error = do_sys_utimensat(l, SCARG(uap, fd), NULL, 3806 SCARG(uap, path), follow, tptr, UIO_USERSPACE); 3807 3808 return error; 3809 } 3810 3811 /* 3812 * Common routine to set access and modification times given a vnode. 3813 */ 3814 int 3815 do_sys_utimens(struct lwp *l, struct vnode *vp, const char *path, int flag, 3816 const struct timespec *tptr, enum uio_seg seg) 3817 { 3818 return do_sys_utimensat(l, AT_FDCWD, vp, path, flag, tptr, seg); 3819 } 3820 3821 int 3822 do_sys_utimensat(struct lwp *l, int fdat, struct vnode *vp, 3823 const char *path, int flag, const struct timespec *tptr, enum uio_seg seg) 3824 { 3825 struct vattr vattr; 3826 int error, dorele = 0; 3827 namei_simple_flags_t sflags; 3828 bool vanull, setbirthtime; 3829 struct timespec ts[2]; 3830 3831 KASSERT(l != NULL || fdat == AT_FDCWD); 3832 3833 /* 3834 * I have checked all callers and they pass either FOLLOW, 3835 * NOFOLLOW, or 0 (when they don't pass a path), and NOFOLLOW 3836 * is 0. More to the point, they don't pass anything else. 3837 * Let's keep it that way at least until the namei interfaces 3838 * are fully sanitized. 3839 */ 3840 KASSERT(flag == NOFOLLOW || flag == FOLLOW); 3841 sflags = (flag == FOLLOW) ? 3842 NSM_FOLLOW_TRYEMULROOT : NSM_NOFOLLOW_TRYEMULROOT; 3843 3844 if (tptr == NULL) { 3845 vanull = true; 3846 nanotime(&ts[0]); 3847 ts[1] = ts[0]; 3848 } else { 3849 vanull = false; 3850 if (seg != UIO_SYSSPACE) { 3851 error = copyin(tptr, ts, sizeof (ts)); 3852 if (error != 0) 3853 return error; 3854 } else { 3855 ts[0] = tptr[0]; 3856 ts[1] = tptr[1]; 3857 } 3858 } 3859 3860 if (ts[0].tv_nsec == UTIME_NOW) { 3861 nanotime(&ts[0]); 3862 if (ts[1].tv_nsec == UTIME_NOW) { 3863 vanull = true; 3864 ts[1] = ts[0]; 3865 } 3866 } else if (ts[1].tv_nsec == UTIME_NOW) 3867 nanotime(&ts[1]); 3868 3869 if (vp == NULL) { 3870 /* note: SEG describes TPTR, not PATH; PATH is always user */ 3871 error = fd_nameiat_simple_user(l, fdat, path, sflags, &vp); 3872 if (error != 0) 3873 return error; 3874 dorele = 1; 3875 } 3876 3877 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3878 setbirthtime = (VOP_GETATTR(vp, &vattr, l->l_cred) == 0 && 3879 timespeccmp(&ts[1], &vattr.va_birthtime, <)); 3880 vattr_null(&vattr); 3881 3882 if (ts[0].tv_nsec != UTIME_OMIT) 3883 vattr.va_atime = ts[0]; 3884 3885 if (ts[1].tv_nsec != UTIME_OMIT) { 3886 vattr.va_mtime = ts[1]; 3887 if (setbirthtime) 3888 vattr.va_birthtime = ts[1]; 3889 } 3890 3891 if (vanull) 3892 vattr.va_vaflags |= VA_UTIMES_NULL; 3893 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3894 VOP_UNLOCK(vp); 3895 3896 if (dorele != 0) 3897 vrele(vp); 3898 3899 return error; 3900 } 3901 3902 int 3903 do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag, 3904 const struct timeval *tptr, enum uio_seg seg) 3905 { 3906 struct timespec ts[2]; 3907 struct timespec *tsptr = NULL; 3908 int error; 3909 3910 if (tptr != NULL) { 3911 struct timeval tv[2]; 3912 3913 if (seg != UIO_SYSSPACE) { 3914 error = copyin(tptr, tv, sizeof(tv)); 3915 if (error != 0) 3916 return error; 3917 tptr = tv; 3918 } 3919 3920 if ((tptr[0].tv_usec == UTIME_NOW) || 3921 (tptr[0].tv_usec == UTIME_OMIT)) 3922 ts[0].tv_nsec = tptr[0].tv_usec; 3923 else 3924 TIMEVAL_TO_TIMESPEC(&tptr[0], &ts[0]); 3925 3926 if ((tptr[1].tv_usec == UTIME_NOW) || 3927 (tptr[1].tv_usec == UTIME_OMIT)) 3928 ts[1].tv_nsec = tptr[1].tv_usec; 3929 else 3930 TIMEVAL_TO_TIMESPEC(&tptr[1], &ts[1]); 3931 3932 tsptr = &ts[0]; 3933 } 3934 3935 return do_sys_utimens(l, vp, path, flag, tsptr, UIO_SYSSPACE); 3936 } 3937 3938 /* 3939 * Truncate a file given its path name. 3940 */ 3941 /* ARGSUSED */ 3942 int 3943 sys_truncate(struct lwp *l, const struct sys_truncate_args *uap, register_t *retval) 3944 { 3945 /* { 3946 syscallarg(const char *) path; 3947 syscallarg(int) pad; 3948 syscallarg(off_t) length; 3949 } */ 3950 struct vnode *vp; 3951 struct vattr vattr; 3952 int error; 3953 3954 if (SCARG(uap, length) < 0) 3955 return EINVAL; 3956 3957 error = namei_simple_user(SCARG(uap, path), 3958 NSM_FOLLOW_TRYEMULROOT, &vp); 3959 if (error != 0) 3960 return (error); 3961 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3962 if (vp->v_type == VDIR) 3963 error = EISDIR; 3964 else if ((error = vn_writechk(vp)) == 0 && 3965 (error = VOP_ACCESS(vp, VWRITE, l->l_cred)) == 0) { 3966 vattr_null(&vattr); 3967 vattr.va_size = SCARG(uap, length); 3968 error = VOP_SETATTR(vp, &vattr, l->l_cred); 3969 } 3970 vput(vp); 3971 return (error); 3972 } 3973 3974 /* 3975 * Truncate a file given a file descriptor. 3976 */ 3977 /* ARGSUSED */ 3978 int 3979 sys_ftruncate(struct lwp *l, const struct sys_ftruncate_args *uap, register_t *retval) 3980 { 3981 /* { 3982 syscallarg(int) fd; 3983 syscallarg(int) pad; 3984 syscallarg(off_t) length; 3985 } */ 3986 struct vattr vattr; 3987 struct vnode *vp; 3988 file_t *fp; 3989 int error; 3990 3991 if (SCARG(uap, length) < 0) 3992 return EINVAL; 3993 3994 /* fd_getvnode() will use the descriptor for us */ 3995 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 3996 return (error); 3997 if ((fp->f_flag & FWRITE) == 0) { 3998 error = EINVAL; 3999 goto out; 4000 } 4001 vp = fp->f_vnode; 4002 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4003 if (vp->v_type == VDIR) 4004 error = EISDIR; 4005 else if ((error = vn_writechk(vp)) == 0) { 4006 vattr_null(&vattr); 4007 vattr.va_size = SCARG(uap, length); 4008 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 4009 } 4010 VOP_UNLOCK(vp); 4011 out: 4012 fd_putfile(SCARG(uap, fd)); 4013 return (error); 4014 } 4015 4016 /* 4017 * Sync an open file. 4018 */ 4019 /* ARGSUSED */ 4020 int 4021 sys_fsync(struct lwp *l, const struct sys_fsync_args *uap, register_t *retval) 4022 { 4023 /* { 4024 syscallarg(int) fd; 4025 } */ 4026 struct vnode *vp; 4027 file_t *fp; 4028 int error; 4029 4030 /* fd_getvnode() will use the descriptor for us */ 4031 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4032 return (error); 4033 vp = fp->f_vnode; 4034 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4035 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0); 4036 VOP_UNLOCK(vp); 4037 fd_putfile(SCARG(uap, fd)); 4038 return (error); 4039 } 4040 4041 /* 4042 * Sync a range of file data. API modeled after that found in AIX. 4043 * 4044 * FDATASYNC indicates that we need only save enough metadata to be able 4045 * to re-read the written data. 4046 */ 4047 /* ARGSUSED */ 4048 int 4049 sys_fsync_range(struct lwp *l, const struct sys_fsync_range_args *uap, register_t *retval) 4050 { 4051 /* { 4052 syscallarg(int) fd; 4053 syscallarg(int) flags; 4054 syscallarg(off_t) start; 4055 syscallarg(off_t) length; 4056 } */ 4057 struct vnode *vp; 4058 file_t *fp; 4059 int flags, nflags; 4060 off_t s, e, len; 4061 int error; 4062 4063 /* fd_getvnode() will use the descriptor for us */ 4064 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4065 return (error); 4066 4067 if ((fp->f_flag & FWRITE) == 0) { 4068 error = EBADF; 4069 goto out; 4070 } 4071 4072 flags = SCARG(uap, flags); 4073 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 4074 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 4075 error = EINVAL; 4076 goto out; 4077 } 4078 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 4079 if (flags & FDATASYNC) 4080 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 4081 else 4082 nflags = FSYNC_WAIT; 4083 if (flags & FDISKSYNC) 4084 nflags |= FSYNC_CACHE; 4085 4086 len = SCARG(uap, length); 4087 /* If length == 0, we do the whole file, and s = e = 0 will do that */ 4088 if (len) { 4089 s = SCARG(uap, start); 4090 e = s + len; 4091 if (e < s) { 4092 error = EINVAL; 4093 goto out; 4094 } 4095 } else { 4096 e = 0; 4097 s = 0; 4098 } 4099 4100 vp = fp->f_vnode; 4101 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4102 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e); 4103 VOP_UNLOCK(vp); 4104 out: 4105 fd_putfile(SCARG(uap, fd)); 4106 return (error); 4107 } 4108 4109 /* 4110 * Sync the data of an open file. 4111 */ 4112 /* ARGSUSED */ 4113 int 4114 sys_fdatasync(struct lwp *l, const struct sys_fdatasync_args *uap, register_t *retval) 4115 { 4116 /* { 4117 syscallarg(int) fd; 4118 } */ 4119 struct vnode *vp; 4120 file_t *fp; 4121 int error; 4122 4123 /* fd_getvnode() will use the descriptor for us */ 4124 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4125 return (error); 4126 vp = fp->f_vnode; 4127 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4128 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0); 4129 VOP_UNLOCK(vp); 4130 fd_putfile(SCARG(uap, fd)); 4131 return (error); 4132 } 4133 4134 /* 4135 * Rename files, (standard) BSD semantics frontend. 4136 */ 4137 /* ARGSUSED */ 4138 int 4139 sys_rename(struct lwp *l, const struct sys_rename_args *uap, register_t *retval) 4140 { 4141 /* { 4142 syscallarg(const char *) from; 4143 syscallarg(const char *) to; 4144 } */ 4145 4146 return (do_sys_renameat(l, AT_FDCWD, SCARG(uap, from), AT_FDCWD, 4147 SCARG(uap, to), UIO_USERSPACE, 0)); 4148 } 4149 4150 int 4151 sys_renameat(struct lwp *l, const struct sys_renameat_args *uap, 4152 register_t *retval) 4153 { 4154 /* { 4155 syscallarg(int) fromfd; 4156 syscallarg(const char *) from; 4157 syscallarg(int) tofd; 4158 syscallarg(const char *) to; 4159 } */ 4160 4161 return (do_sys_renameat(l, SCARG(uap, fromfd), SCARG(uap, from), 4162 SCARG(uap, tofd), SCARG(uap, to), UIO_USERSPACE, 0)); 4163 } 4164 4165 /* 4166 * Rename files, POSIX semantics frontend. 4167 */ 4168 /* ARGSUSED */ 4169 int 4170 sys___posix_rename(struct lwp *l, const struct sys___posix_rename_args *uap, register_t *retval) 4171 { 4172 /* { 4173 syscallarg(const char *) from; 4174 syscallarg(const char *) to; 4175 } */ 4176 4177 return (do_sys_renameat(l, AT_FDCWD, SCARG(uap, from), AT_FDCWD, 4178 SCARG(uap, to), UIO_USERSPACE, 1)); 4179 } 4180 4181 /* 4182 * Rename files. Source and destination must either both be directories, 4183 * or both not be directories. If target is a directory, it must be empty. 4184 * If `from' and `to' refer to the same object, the value of the `retain' 4185 * argument is used to determine whether `from' will be 4186 * 4187 * (retain == 0) deleted unless `from' and `to' refer to the same 4188 * object in the file system's name space (BSD). 4189 * (retain == 1) always retained (POSIX). 4190 * 4191 * XXX Synchronize with nfsrv_rename in nfs_serv.c. 4192 */ 4193 int 4194 do_sys_rename(const char *from, const char *to, enum uio_seg seg, int retain) 4195 { 4196 return do_sys_renameat(NULL, AT_FDCWD, from, AT_FDCWD, to, seg, retain); 4197 } 4198 4199 static int 4200 do_sys_renameat(struct lwp *l, int fromfd, const char *from, int tofd, 4201 const char *to, enum uio_seg seg, int retain) 4202 { 4203 struct pathbuf *fpb, *tpb; 4204 struct nameidata fnd, tnd; 4205 struct vnode *fdvp, *fvp; 4206 struct vnode *tdvp, *tvp; 4207 struct mount *mp, *tmp; 4208 int error; 4209 4210 KASSERT(l != NULL || (fromfd == AT_FDCWD && tofd == AT_FDCWD)); 4211 4212 error = pathbuf_maybe_copyin(from, seg, &fpb); 4213 if (error) 4214 goto out0; 4215 KASSERT(fpb != NULL); 4216 4217 error = pathbuf_maybe_copyin(to, seg, &tpb); 4218 if (error) 4219 goto out1; 4220 KASSERT(tpb != NULL); 4221 4222 /* 4223 * Lookup from. 4224 * 4225 * XXX LOCKPARENT is wrong because we don't actually want it 4226 * locked yet, but (a) namei is insane, and (b) VOP_RENAME is 4227 * insane, so for the time being we need to leave it like this. 4228 */ 4229 NDINIT(&fnd, DELETE, (LOCKPARENT | TRYEMULROOT), fpb); 4230 if ((error = fd_nameiat(l, fromfd, &fnd)) != 0) 4231 goto out2; 4232 4233 /* 4234 * Pull out the important results of the lookup, fdvp and fvp. 4235 * Of course, fvp is bogus because we're about to unlock fdvp. 4236 */ 4237 fdvp = fnd.ni_dvp; 4238 fvp = fnd.ni_vp; 4239 mp = fdvp->v_mount; 4240 KASSERT(fdvp != NULL); 4241 KASSERT(fvp != NULL); 4242 KASSERT((fdvp == fvp) || (VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE)); 4243 /* 4244 * Bracket the operation with fstrans_start()/fstrans_done(). 4245 * 4246 * Inside the bracket this file system cannot be unmounted so 4247 * a vnode on this file system cannot change its v_mount. 4248 * A vnode on another file system may still change to dead mount. 4249 */ 4250 fstrans_start(mp); 4251 4252 /* 4253 * Make sure neither fdvp nor fvp is locked. 4254 */ 4255 if (fdvp != fvp) 4256 VOP_UNLOCK(fdvp); 4257 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4258 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4259 4260 /* 4261 * Reject renaming `.' and `..'. Can't do this until after 4262 * namei because we need namei's parsing to find the final 4263 * component name. (namei should just leave us with the final 4264 * component name and not look it up itself, but anyway...) 4265 * 4266 * This was here before because we used to relookup from 4267 * instead of to and relookup requires the caller to check 4268 * this, but now file systems may depend on this check, so we 4269 * must retain it until the file systems are all rototilled. 4270 */ 4271 if (((fnd.ni_cnd.cn_namelen == 1) && 4272 (fnd.ni_cnd.cn_nameptr[0] == '.')) || 4273 ((fnd.ni_cnd.cn_namelen == 2) && 4274 (fnd.ni_cnd.cn_nameptr[0] == '.') && 4275 (fnd.ni_cnd.cn_nameptr[1] == '.'))) { 4276 error = EINVAL; /* XXX EISDIR? */ 4277 goto abort0; 4278 } 4279 4280 /* 4281 * Lookup to. 4282 * 4283 * XXX LOCKPARENT is wrong, but...insanity, &c. Also, using 4284 * fvp here to decide whether to add CREATEDIR is a load of 4285 * bollocks because fvp might be the wrong node by now, since 4286 * fdvp is unlocked. 4287 * 4288 * XXX Why not pass CREATEDIR always? 4289 */ 4290 NDINIT(&tnd, RENAME, 4291 (LOCKPARENT | NOCACHE | TRYEMULROOT | 4292 ((fvp->v_type == VDIR)? CREATEDIR : 0)), 4293 tpb); 4294 if ((error = fd_nameiat(l, tofd, &tnd)) != 0) 4295 goto abort0; 4296 4297 /* 4298 * Pull out the important results of the lookup, tdvp and tvp. 4299 * Of course, tvp is bogus because we're about to unlock tdvp. 4300 */ 4301 tdvp = tnd.ni_dvp; 4302 tvp = tnd.ni_vp; 4303 KASSERT(tdvp != NULL); 4304 KASSERT((tdvp == tvp) || (VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE)); 4305 4306 /* 4307 * Make sure neither tdvp nor tvp is locked. 4308 */ 4309 if (tdvp != tvp) 4310 VOP_UNLOCK(tdvp); 4311 /* XXX KASSERT(VOP_ISLOCKED(tdvp) != LK_EXCLUSIVE); */ 4312 /* XXX KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) != LK_EXCLUSIVE)); */ 4313 4314 /* 4315 * Reject renaming onto `.' or `..'. relookup is unhappy with 4316 * these, which is why we must do this here. Once upon a time 4317 * we relooked up from instead of to, and consequently didn't 4318 * need this check, but now that we relookup to instead of 4319 * from, we need this; and we shall need it forever forward 4320 * until the VOP_RENAME protocol changes, because file systems 4321 * will no doubt begin to depend on this check. 4322 */ 4323 if ((tnd.ni_cnd.cn_namelen == 1) && (tnd.ni_cnd.cn_nameptr[0] == '.')) { 4324 error = EISDIR; 4325 goto abort1; 4326 } 4327 if ((tnd.ni_cnd.cn_namelen == 2) && 4328 (tnd.ni_cnd.cn_nameptr[0] == '.') && 4329 (tnd.ni_cnd.cn_nameptr[1] == '.')) { 4330 error = EINVAL; 4331 goto abort1; 4332 } 4333 4334 /* 4335 * Make sure the mount points match. Although we don't hold 4336 * any vnode locks, the v_mount on fdvp file system are stable. 4337 * 4338 * Unmounting another file system at an inopportune moment may 4339 * cause tdvp to disappear and change its v_mount to dead. 4340 * 4341 * So in either case different v_mount means cross-device rename. 4342 */ 4343 KASSERT(mp != NULL); 4344 tmp = tdvp->v_mount; 4345 4346 if (mp != tmp) { 4347 error = EXDEV; 4348 goto abort1; 4349 } 4350 4351 /* 4352 * Take the vfs rename lock to avoid cross-directory screw cases. 4353 * Nothing is locked currently, so taking this lock is safe. 4354 */ 4355 error = VFS_RENAMELOCK_ENTER(mp); 4356 if (error) 4357 goto abort1; 4358 4359 /* 4360 * Now fdvp, fvp, tdvp, and (if nonnull) tvp are referenced, 4361 * and nothing is locked except for the vfs rename lock. 4362 * 4363 * The next step is a little rain dance to conform to the 4364 * insane lock protocol, even though it does nothing to ward 4365 * off race conditions. 4366 * 4367 * We need tdvp and tvp to be locked. However, because we have 4368 * unlocked tdvp in order to hold no locks while we take the 4369 * vfs rename lock, tvp may be wrong here, and we can't safely 4370 * lock it even if the sensible file systems will just unlock 4371 * it straight away. Consequently, we must lock tdvp and then 4372 * relookup tvp to get it locked. 4373 * 4374 * Finally, because the VOP_RENAME protocol is brain-damaged 4375 * and various file systems insanely depend on the semantics of 4376 * this brain damage, the lookup of to must be the last lookup 4377 * before VOP_RENAME. 4378 */ 4379 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 4380 error = relookup(tdvp, &tnd.ni_vp, &tnd.ni_cnd, 0); 4381 if (error) 4382 goto abort2; 4383 4384 /* 4385 * Drop the old tvp and pick up the new one -- which might be 4386 * the same, but that doesn't matter to us. After this, tdvp 4387 * and tvp should both be locked. 4388 */ 4389 if (tvp != NULL) 4390 vrele(tvp); 4391 tvp = tnd.ni_vp; 4392 KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 4393 KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 4394 4395 /* 4396 * The old do_sys_rename had various consistency checks here 4397 * involving fvp and tvp. fvp is bogus already here, and tvp 4398 * will become bogus soon in any sensible file system, so the 4399 * only purpose in putting these checks here is to give lip 4400 * service to these screw cases and to acknowledge that they 4401 * exist, not actually to handle them, but here you go 4402 * anyway... 4403 */ 4404 4405 /* 4406 * Acknowledge that directories and non-directories aren't 4407 * suposed to mix. 4408 */ 4409 if (tvp != NULL) { 4410 if ((fvp->v_type == VDIR) && (tvp->v_type != VDIR)) { 4411 error = ENOTDIR; 4412 goto abort3; 4413 } else if ((fvp->v_type != VDIR) && (tvp->v_type == VDIR)) { 4414 error = EISDIR; 4415 goto abort3; 4416 } 4417 } 4418 4419 /* 4420 * Acknowledge some random screw case, among the dozens that 4421 * might arise. 4422 */ 4423 if (fvp == tdvp) { 4424 error = EINVAL; 4425 goto abort3; 4426 } 4427 4428 /* 4429 * Acknowledge that POSIX has a wacky screw case. 4430 * 4431 * XXX Eventually the retain flag needs to be passed on to 4432 * VOP_RENAME. 4433 */ 4434 if (fvp == tvp) { 4435 if (retain) { 4436 error = 0; 4437 goto abort3; 4438 } else if ((fdvp == tdvp) && 4439 (fnd.ni_cnd.cn_namelen == tnd.ni_cnd.cn_namelen) && 4440 (0 == memcmp(fnd.ni_cnd.cn_nameptr, tnd.ni_cnd.cn_nameptr, 4441 fnd.ni_cnd.cn_namelen))) { 4442 error = 0; 4443 goto abort3; 4444 } 4445 } 4446 4447 /* 4448 * Make sure veriexec can screw us up. (But a race can screw 4449 * up veriexec, of course -- remember, fvp and (soon) tvp are 4450 * bogus.) 4451 */ 4452 #if NVERIEXEC > 0 4453 { 4454 char *f1, *f2; 4455 size_t f1_len; 4456 size_t f2_len; 4457 4458 f1_len = fnd.ni_cnd.cn_namelen + 1; 4459 f1 = kmem_alloc(f1_len, KM_SLEEP); 4460 strlcpy(f1, fnd.ni_cnd.cn_nameptr, f1_len); 4461 4462 f2_len = tnd.ni_cnd.cn_namelen + 1; 4463 f2 = kmem_alloc(f2_len, KM_SLEEP); 4464 strlcpy(f2, tnd.ni_cnd.cn_nameptr, f2_len); 4465 4466 error = veriexec_renamechk(curlwp, fvp, f1, tvp, f2); 4467 4468 kmem_free(f1, f1_len); 4469 kmem_free(f2, f2_len); 4470 4471 if (error) 4472 goto abort3; 4473 } 4474 #endif /* NVERIEXEC > 0 */ 4475 4476 /* 4477 * All ready. Incant the rename vop. 4478 */ 4479 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4480 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4481 KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 4482 KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 4483 error = VOP_RENAME(fdvp, fvp, &fnd.ni_cnd, tdvp, tvp, &tnd.ni_cnd); 4484 4485 /* 4486 * VOP_RENAME releases fdvp, fvp, tdvp, and tvp, and unlocks 4487 * tdvp and tvp. But we can't assert any of that. 4488 */ 4489 /* XXX KASSERT(VOP_ISLOCKED(fdvp) != LK_EXCLUSIVE); */ 4490 /* XXX KASSERT(VOP_ISLOCKED(fvp) != LK_EXCLUSIVE); */ 4491 /* XXX KASSERT(VOP_ISLOCKED(tdvp) != LK_EXCLUSIVE); */ 4492 /* XXX KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) != LK_EXCLUSIVE)); */ 4493 4494 /* 4495 * So all we have left to do is to drop the rename lock and 4496 * destroy the pathbufs. 4497 */ 4498 VFS_RENAMELOCK_EXIT(mp); 4499 fstrans_done(mp); 4500 goto out2; 4501 4502 abort3: if ((tvp != NULL) && (tvp != tdvp)) 4503 VOP_UNLOCK(tvp); 4504 abort2: VOP_UNLOCK(tdvp); 4505 VFS_RENAMELOCK_EXIT(mp); 4506 abort1: VOP_ABORTOP(tdvp, &tnd.ni_cnd); 4507 vrele(tdvp); 4508 if (tvp != NULL) 4509 vrele(tvp); 4510 abort0: VOP_ABORTOP(fdvp, &fnd.ni_cnd); 4511 vrele(fdvp); 4512 vrele(fvp); 4513 fstrans_done(mp); 4514 out2: pathbuf_destroy(tpb); 4515 out1: pathbuf_destroy(fpb); 4516 out0: return error; 4517 } 4518 4519 /* 4520 * Make a directory file. 4521 */ 4522 /* ARGSUSED */ 4523 int 4524 sys_mkdir(struct lwp *l, const struct sys_mkdir_args *uap, register_t *retval) 4525 { 4526 /* { 4527 syscallarg(const char *) path; 4528 syscallarg(int) mode; 4529 } */ 4530 4531 return do_sys_mkdirat(l, AT_FDCWD, SCARG(uap, path), 4532 SCARG(uap, mode), UIO_USERSPACE); 4533 } 4534 4535 int 4536 sys_mkdirat(struct lwp *l, const struct sys_mkdirat_args *uap, 4537 register_t *retval) 4538 { 4539 /* { 4540 syscallarg(int) fd; 4541 syscallarg(const char *) path; 4542 syscallarg(int) mode; 4543 } */ 4544 4545 return do_sys_mkdirat(l, SCARG(uap, fd), SCARG(uap, path), 4546 SCARG(uap, mode), UIO_USERSPACE); 4547 } 4548 4549 4550 int 4551 do_sys_mkdir(const char *path, mode_t mode, enum uio_seg seg) 4552 { 4553 return do_sys_mkdirat(NULL, AT_FDCWD, path, mode, seg); 4554 } 4555 4556 static int 4557 do_sys_mkdirat(struct lwp *l, int fdat, const char *path, mode_t mode, 4558 enum uio_seg seg) 4559 { 4560 struct proc *p = curlwp->l_proc; 4561 struct vnode *vp; 4562 struct vattr vattr; 4563 int error; 4564 struct pathbuf *pb; 4565 struct nameidata nd; 4566 4567 KASSERT(l != NULL || fdat == AT_FDCWD); 4568 4569 /* XXX bollocks, should pass in a pathbuf */ 4570 error = pathbuf_maybe_copyin(path, seg, &pb); 4571 if (error) { 4572 return error; 4573 } 4574 4575 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT, pb); 4576 4577 if ((error = fd_nameiat(l, fdat, &nd)) != 0) { 4578 pathbuf_destroy(pb); 4579 return (error); 4580 } 4581 vp = nd.ni_vp; 4582 if (vp != NULL) { 4583 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 4584 if (nd.ni_dvp == vp) 4585 vrele(nd.ni_dvp); 4586 else 4587 vput(nd.ni_dvp); 4588 vrele(vp); 4589 pathbuf_destroy(pb); 4590 return (EEXIST); 4591 } 4592 vattr_null(&vattr); 4593 vattr.va_type = VDIR; 4594 /* We will read cwdi->cwdi_cmask unlocked. */ 4595 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 4596 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 4597 if (!error) 4598 vrele(nd.ni_vp); 4599 vput(nd.ni_dvp); 4600 pathbuf_destroy(pb); 4601 return (error); 4602 } 4603 4604 /* 4605 * Remove a directory file. 4606 */ 4607 /* ARGSUSED */ 4608 int 4609 sys_rmdir(struct lwp *l, const struct sys_rmdir_args *uap, register_t *retval) 4610 { 4611 return do_sys_unlinkat(l, AT_FDCWD, SCARG(uap, path), 4612 AT_REMOVEDIR, UIO_USERSPACE); 4613 } 4614 4615 /* 4616 * Read a block of directory entries in a file system independent format. 4617 */ 4618 int 4619 sys___getdents30(struct lwp *l, const struct sys___getdents30_args *uap, register_t *retval) 4620 { 4621 /* { 4622 syscallarg(int) fd; 4623 syscallarg(char *) buf; 4624 syscallarg(size_t) count; 4625 } */ 4626 file_t *fp; 4627 int error, done; 4628 4629 /* fd_getvnode() will use the descriptor for us */ 4630 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 4631 return (error); 4632 if ((fp->f_flag & FREAD) == 0) { 4633 error = EBADF; 4634 goto out; 4635 } 4636 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 4637 SCARG(uap, count), &done, l, 0, 0); 4638 ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, buf), done, error); 4639 *retval = done; 4640 out: 4641 fd_putfile(SCARG(uap, fd)); 4642 return (error); 4643 } 4644 4645 /* 4646 * Set the mode mask for creation of filesystem nodes. 4647 */ 4648 int 4649 sys_umask(struct lwp *l, const struct sys_umask_args *uap, register_t *retval) 4650 { 4651 /* { 4652 syscallarg(mode_t) newmask; 4653 } */ 4654 struct proc *p = l->l_proc; 4655 struct cwdinfo *cwdi; 4656 4657 /* 4658 * cwdi->cwdi_cmask will be read unlocked elsewhere. What's 4659 * important is that we serialize changes to the mask. The 4660 * rw_exit() will issue a write memory barrier on our behalf, 4661 * and force the changes out to other CPUs (as it must use an 4662 * atomic operation, draining the local CPU's store buffers). 4663 */ 4664 cwdi = p->p_cwdi; 4665 rw_enter(&cwdi->cwdi_lock, RW_WRITER); 4666 *retval = cwdi->cwdi_cmask; 4667 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 4668 rw_exit(&cwdi->cwdi_lock); 4669 4670 return (0); 4671 } 4672 4673 int 4674 dorevoke(struct vnode *vp, kauth_cred_t cred) 4675 { 4676 struct vattr vattr; 4677 int error, fs_decision; 4678 4679 vn_lock(vp, LK_SHARED | LK_RETRY); 4680 error = VOP_GETATTR(vp, &vattr, cred); 4681 VOP_UNLOCK(vp); 4682 if (error != 0) 4683 return error; 4684 fs_decision = (kauth_cred_geteuid(cred) == vattr.va_uid) ? 0 : EPERM; 4685 error = kauth_authorize_vnode(cred, KAUTH_VNODE_REVOKE, vp, NULL, 4686 fs_decision); 4687 if (!error) 4688 VOP_REVOKE(vp, REVOKEALL); 4689 return (error); 4690 } 4691 4692 /* 4693 * Void all references to file by ripping underlying filesystem 4694 * away from vnode. 4695 */ 4696 /* ARGSUSED */ 4697 int 4698 sys_revoke(struct lwp *l, const struct sys_revoke_args *uap, register_t *retval) 4699 { 4700 /* { 4701 syscallarg(const char *) path; 4702 } */ 4703 struct vnode *vp; 4704 int error; 4705 4706 error = namei_simple_user(SCARG(uap, path), 4707 NSM_FOLLOW_TRYEMULROOT, &vp); 4708 if (error != 0) 4709 return (error); 4710 error = dorevoke(vp, l->l_cred); 4711 vrele(vp); 4712 return (error); 4713 } 4714 4715 /* 4716 * Allocate backing store for a file, filling a hole without having to 4717 * explicitly write anything out. 4718 */ 4719 /* ARGSUSED */ 4720 int 4721 sys_posix_fallocate(struct lwp *l, const struct sys_posix_fallocate_args *uap, 4722 register_t *retval) 4723 { 4724 /* { 4725 syscallarg(int) fd; 4726 syscallarg(off_t) pos; 4727 syscallarg(off_t) len; 4728 } */ 4729 int fd; 4730 off_t pos, len; 4731 struct file *fp; 4732 struct vnode *vp; 4733 int error; 4734 4735 fd = SCARG(uap, fd); 4736 pos = SCARG(uap, pos); 4737 len = SCARG(uap, len); 4738 4739 if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) { 4740 *retval = EINVAL; 4741 return 0; 4742 } 4743 4744 error = fd_getvnode(fd, &fp); 4745 if (error) { 4746 *retval = error; 4747 return 0; 4748 } 4749 if ((fp->f_flag & FWRITE) == 0) { 4750 error = EBADF; 4751 goto fail; 4752 } 4753 vp = fp->f_vnode; 4754 4755 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4756 if (vp->v_type == VDIR) { 4757 error = EISDIR; 4758 } else { 4759 error = VOP_FALLOCATE(vp, pos, len); 4760 } 4761 VOP_UNLOCK(vp); 4762 4763 fail: 4764 fd_putfile(fd); 4765 *retval = error; 4766 return 0; 4767 } 4768 4769 /* 4770 * Deallocate backing store for a file, creating a hole. Also used for 4771 * invoking TRIM on disks. 4772 */ 4773 /* ARGSUSED */ 4774 int 4775 sys_fdiscard(struct lwp *l, const struct sys_fdiscard_args *uap, 4776 register_t *retval) 4777 { 4778 /* { 4779 syscallarg(int) fd; 4780 syscallarg(off_t) pos; 4781 syscallarg(off_t) len; 4782 } */ 4783 int fd; 4784 off_t pos, len; 4785 struct file *fp; 4786 struct vnode *vp; 4787 int error; 4788 4789 fd = SCARG(uap, fd); 4790 pos = SCARG(uap, pos); 4791 len = SCARG(uap, len); 4792 4793 if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) { 4794 return EINVAL; 4795 } 4796 4797 error = fd_getvnode(fd, &fp); 4798 if (error) { 4799 return error; 4800 } 4801 if ((fp->f_flag & FWRITE) == 0) { 4802 error = EBADF; 4803 goto fail; 4804 } 4805 vp = fp->f_vnode; 4806 4807 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4808 if (vp->v_type == VDIR) { 4809 error = EISDIR; 4810 } else { 4811 error = VOP_FDISCARD(vp, pos, len); 4812 } 4813 VOP_UNLOCK(vp); 4814 4815 fail: 4816 fd_putfile(fd); 4817 return error; 4818 } 4819
Indexes created Fri Oct 03 02:09:57 GMT 2025