1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include "opt_capsicum.h" 38 #include "opt_ktrace.h" 39 40 #define EXTERR_CATEGORY EXTERR_CAT_VFSSYSCALL 41 #include <sys/systm.h> 42 #ifdef COMPAT_FREEBSD11 43 #include <sys/abi_compat.h> 44 #endif 45 #include <sys/bio.h> 46 #include <sys/buf.h> 47 #include <sys/capsicum.h> 48 #include <sys/disk.h> 49 #include <sys/dirent.h> 50 #include <sys/exterrvar.h> 51 #include <sys/fcntl.h> 52 #include <sys/file.h> 53 #include <sys/filedesc.h> 54 #include <sys/filio.h> 55 #include <sys/jail.h> 56 #include <sys/kernel.h> 57 #ifdef KTRACE 58 #include <sys/ktrace.h> 59 #endif 60 #include <sys/limits.h> 61 #include <sys/linker.h> 62 #include <sys/malloc.h> 63 #include <sys/mount.h> 64 #include <sys/mutex.h> 65 #include <sys/namei.h> 66 #include <sys/priv.h> 67 #include <sys/proc.h> 68 #include <sys/rwlock.h> 69 #include <sys/sdt.h> 70 #include <sys/stat.h> 71 #include <sys/stdarg.h> 72 #include <sys/sx.h> 73 #include <sys/syscallsubr.h> 74 #include <sys/sysctl.h> 75 #include <sys/sysproto.h> 76 #include <sys/unistd.h> 77 #include <sys/vnode.h> 78 79 #include <security/audit/audit.h> 80 #include <security/mac/mac_framework.h> 81 82 #include <vm/vm.h> 83 #include <vm/vm_object.h> 84 #include <vm/vm_page.h> 85 #include <vm/vnode_pager.h> 86 #include <vm/uma.h> 87 88 #include <fs/devfs/devfs.h> 89 90 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 91 92 static int kern_chflagsat(struct thread *td, int fd, const char *path, 93 enum uio_seg pathseg, u_long flags, int atflag); 94 static int setfflags(struct thread *td, struct vnode *, u_long); 95 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 96 static int getutimens(const struct timespec *, enum uio_seg, 97 struct timespec *, int *); 98 static int setutimes(struct thread *td, struct vnode *, 99 const struct timespec *, int, int); 100 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 101 struct thread *td); 102 static int kern_fhlinkat(struct thread *td, int fd, const char *path, 103 enum uio_seg pathseg, fhandle_t *fhp); 104 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, 105 size_t count, struct thread *td); 106 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, 107 const char *path, enum uio_seg segflag); 108 109 uint64_t 110 at2cnpflags(u_int at_flags, u_int mask) 111 { 112 uint64_t res; 113 114 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) != 115 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)); 116 117 res = 0; 118 at_flags &= mask; 119 if ((at_flags & AT_RESOLVE_BENEATH) != 0) 120 res |= RBENEATH; 121 if ((at_flags & AT_SYMLINK_FOLLOW) != 0) 122 res |= FOLLOW; 123 /* NOFOLLOW is pseudo flag */ 124 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) { 125 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 126 FOLLOW; 127 } 128 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0) 129 res |= EMPTYPATH; 130 return (res); 131 } 132 133 int 134 kern_sync(struct thread *td) 135 { 136 struct mount *mp, *nmp; 137 int save; 138 139 mtx_lock(&mountlist_mtx); 140 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 141 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 142 nmp = TAILQ_NEXT(mp, mnt_list); 143 continue; 144 } 145 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 146 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 147 save = curthread_pflags_set(TDP_SYNCIO); 148 vfs_periodic(mp, MNT_NOWAIT); 149 VFS_SYNC(mp, MNT_NOWAIT); 150 curthread_pflags_restore(save); 151 vn_finished_write(mp); 152 } 153 mtx_lock(&mountlist_mtx); 154 nmp = TAILQ_NEXT(mp, mnt_list); 155 vfs_unbusy(mp); 156 } 157 mtx_unlock(&mountlist_mtx); 158 return (0); 159 } 160 161 /* 162 * Sync each mounted filesystem. 163 */ 164 #ifndef _SYS_SYSPROTO_H_ 165 struct sync_args { 166 int dummy; 167 }; 168 #endif 169 /* ARGSUSED */ 170 int 171 sys_sync(struct thread *td, struct sync_args *uap) 172 { 173 174 return (kern_sync(td)); 175 } 176 177 /* 178 * Change filesystem quotas. 179 */ 180 #ifndef _SYS_SYSPROTO_H_ 181 struct quotactl_args { 182 char *path; 183 int cmd; 184 int uid; 185 caddr_t arg; 186 }; 187 #endif 188 int 189 sys_quotactl(struct thread *td, struct quotactl_args *uap) 190 { 191 struct mount *mp; 192 struct nameidata nd; 193 int error; 194 bool mp_busy; 195 196 AUDIT_ARG_CMD(uap->cmd); 197 AUDIT_ARG_UID(uap->uid); 198 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 199 return (EPERM); 200 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 201 uap->path); 202 if ((error = namei(&nd)) != 0) 203 return (error); 204 NDFREE_PNBUF(&nd); 205 mp = nd.ni_vp->v_mount; 206 vfs_ref(mp); 207 vput(nd.ni_vp); 208 error = vfs_busy(mp, 0); 209 if (error != 0) { 210 vfs_rel(mp); 211 return (error); 212 } 213 mp_busy = true; 214 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, &mp_busy); 215 216 /* 217 * Since quota on/off operations typically need to open quota 218 * files, the implementation may need to unbusy the mount point 219 * before calling into namei. Otherwise, unmount might be 220 * started between two vfs_busy() invocations (first is ours, 221 * second is from mount point cross-walk code in lookup()), 222 * causing deadlock. 223 * 224 * Avoid unbusying mp if the implementation indicates it has 225 * already done so. 226 */ 227 if (mp_busy) 228 vfs_unbusy(mp); 229 vfs_rel(mp); 230 return (error); 231 } 232 233 /* 234 * Used by statfs conversion routines to scale the block size up if 235 * necessary so that all of the block counts are <= 'max_size'. Note 236 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 237 * value of 'n'. 238 */ 239 void 240 statfs_scale_blocks(struct statfs *sf, long max_size) 241 { 242 uint64_t count; 243 int shift; 244 245 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 246 247 /* 248 * Attempt to scale the block counts to give a more accurate 249 * overview to userland of the ratio of free space to used 250 * space. To do this, find the largest block count and compute 251 * a divisor that lets it fit into a signed integer <= max_size. 252 */ 253 if (sf->f_bavail < 0) 254 count = -sf->f_bavail; 255 else 256 count = sf->f_bavail; 257 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 258 if (count <= max_size) 259 return; 260 261 count >>= flsl(max_size); 262 shift = 0; 263 while (count > 0) { 264 shift++; 265 count >>=1; 266 } 267 268 sf->f_bsize <<= shift; 269 sf->f_blocks >>= shift; 270 sf->f_bfree >>= shift; 271 sf->f_bavail >>= shift; 272 } 273 274 static int 275 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 276 { 277 int error; 278 279 if (mp == NULL) 280 return (EBADF); 281 error = vfs_busy(mp, MBF_PCATCH); 282 vfs_rel(mp); 283 if (error != 0) 284 return (error); 285 #ifdef MAC 286 error = mac_mount_check_stat(td->td_ucred, mp); 287 if (error != 0) 288 goto out; 289 #endif 290 error = VFS_STATFS(mp, buf); 291 if (error != 0) 292 goto out; 293 if (priv_check_cred_vfs_generation(td->td_ucred)) 294 prison_enforce_statfs(td->td_ucred, mp, buf); 295 out: 296 vfs_unbusy(mp); 297 return (error); 298 } 299 300 /* 301 * Get filesystem statistics. 302 */ 303 #ifndef _SYS_SYSPROTO_H_ 304 struct statfs_args { 305 char *path; 306 struct statfs *buf; 307 }; 308 #endif 309 int 310 sys_statfs(struct thread *td, struct statfs_args *uap) 311 { 312 struct statfs *sfp; 313 int error; 314 315 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 316 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 317 if (error == 0) 318 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 319 free(sfp, M_STATFS); 320 return (error); 321 } 322 323 int 324 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg, 325 struct statfs *buf) 326 { 327 struct mount *mp; 328 struct nameidata nd; 329 int error; 330 331 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path); 332 error = namei(&nd); 333 if (error != 0) 334 return (error); 335 NDFREE_PNBUF(&nd); 336 mp = vfs_ref_from_vp(nd.ni_vp); 337 vrele(nd.ni_vp); 338 return (kern_do_statfs(td, mp, buf)); 339 } 340 341 /* 342 * Get filesystem statistics. 343 */ 344 #ifndef _SYS_SYSPROTO_H_ 345 struct fstatfs_args { 346 int fd; 347 struct statfs *buf; 348 }; 349 #endif 350 int 351 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 352 { 353 struct statfs *sfp; 354 int error; 355 356 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 357 error = kern_fstatfs(td, uap->fd, sfp); 358 if (error == 0) 359 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 360 free(sfp, M_STATFS); 361 return (error); 362 } 363 364 int 365 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 366 { 367 struct file *fp; 368 struct mount *mp; 369 struct vnode *vp; 370 int error; 371 372 AUDIT_ARG_FD(fd); 373 error = getvnode_path(td, fd, &cap_fstatfs_rights, NULL, &fp); 374 if (error != 0) 375 return (error); 376 vp = fp->f_vnode; 377 #ifdef AUDIT 378 if (AUDITING_TD(td)) { 379 vn_lock(vp, LK_SHARED | LK_RETRY); 380 AUDIT_ARG_VNODE1(vp); 381 VOP_UNLOCK(vp); 382 } 383 #endif 384 mp = vfs_ref_from_vp(vp); 385 fdrop(fp, td); 386 return (kern_do_statfs(td, mp, buf)); 387 } 388 389 /* 390 * Get statistics on all filesystems. 391 */ 392 #ifndef _SYS_SYSPROTO_H_ 393 struct getfsstat_args { 394 struct statfs *buf; 395 long bufsize; 396 int mode; 397 }; 398 #endif 399 int 400 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 401 { 402 size_t count; 403 int error; 404 405 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 406 return (EINVAL); 407 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 408 UIO_USERSPACE, uap->mode); 409 if (error == 0) 410 td->td_retval[0] = count; 411 return (error); 412 } 413 414 /* 415 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 416 * The caller is responsible for freeing memory which will be allocated 417 * in '*buf'. 418 */ 419 int 420 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 421 size_t *countp, enum uio_seg bufseg, int mode) 422 { 423 struct mount *mp, *nmp; 424 struct statfs *sfsp, *sp, *sptmp, *tofree; 425 size_t count, maxcount; 426 int error; 427 428 switch (mode) { 429 case MNT_WAIT: 430 case MNT_NOWAIT: 431 break; 432 default: 433 if (bufseg == UIO_SYSSPACE) 434 *buf = NULL; 435 return (EINVAL); 436 } 437 restart: 438 maxcount = bufsize / sizeof(struct statfs); 439 if (bufsize == 0) { 440 sfsp = NULL; 441 tofree = NULL; 442 } else if (bufseg == UIO_USERSPACE) { 443 sfsp = *buf; 444 tofree = NULL; 445 } else /* if (bufseg == UIO_SYSSPACE) */ { 446 count = 0; 447 mtx_lock(&mountlist_mtx); 448 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 449 count++; 450 } 451 mtx_unlock(&mountlist_mtx); 452 if (maxcount > count) 453 maxcount = count; 454 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 455 M_STATFS, M_WAITOK); 456 } 457 458 count = 0; 459 460 /* 461 * If there is no target buffer they only want the count. 462 * 463 * This could be TAILQ_FOREACH but it is open-coded to match the original 464 * code below. 465 */ 466 if (sfsp == NULL) { 467 mtx_lock(&mountlist_mtx); 468 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 469 if (prison_canseemount(td->td_ucred, mp) != 0) { 470 nmp = TAILQ_NEXT(mp, mnt_list); 471 continue; 472 } 473 #ifdef MAC 474 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 475 nmp = TAILQ_NEXT(mp, mnt_list); 476 continue; 477 } 478 #endif 479 count++; 480 nmp = TAILQ_NEXT(mp, mnt_list); 481 } 482 mtx_unlock(&mountlist_mtx); 483 *countp = count; 484 return (0); 485 } 486 487 /* 488 * They want the entire thing. 489 * 490 * Short-circuit the corner case of no room for anything, avoids 491 * relocking below. 492 */ 493 if (maxcount < 1) { 494 goto out; 495 } 496 497 mtx_lock(&mountlist_mtx); 498 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 499 if (prison_canseemount(td->td_ucred, mp) != 0) { 500 nmp = TAILQ_NEXT(mp, mnt_list); 501 continue; 502 } 503 #ifdef MAC 504 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 505 nmp = TAILQ_NEXT(mp, mnt_list); 506 continue; 507 } 508 #endif 509 if (mode == MNT_WAIT) { 510 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 511 /* 512 * If vfs_busy() failed, and MBF_NOWAIT 513 * wasn't passed, then the mp is gone. 514 * Furthermore, because of MBF_MNTLSTLOCK, 515 * the mountlist_mtx was dropped. We have 516 * no other choice than to start over. 517 */ 518 mtx_unlock(&mountlist_mtx); 519 free(tofree, M_STATFS); 520 goto restart; 521 } 522 } else { 523 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 524 nmp = TAILQ_NEXT(mp, mnt_list); 525 continue; 526 } 527 } 528 sp = &mp->mnt_stat; 529 /* 530 * If MNT_NOWAIT is specified, do not refresh 531 * the fsstat cache. 532 */ 533 if (mode != MNT_NOWAIT) { 534 error = VFS_STATFS(mp, sp); 535 if (error != 0) { 536 mtx_lock(&mountlist_mtx); 537 nmp = TAILQ_NEXT(mp, mnt_list); 538 vfs_unbusy(mp); 539 continue; 540 } 541 } 542 if (priv_check_cred_vfs_generation(td->td_ucred)) { 543 sptmp = malloc(sizeof(struct statfs), M_STATFS, 544 M_WAITOK); 545 *sptmp = *sp; 546 prison_enforce_statfs(td->td_ucred, mp, sptmp); 547 sp = sptmp; 548 } else 549 sptmp = NULL; 550 if (bufseg == UIO_SYSSPACE) { 551 bcopy(sp, sfsp, sizeof(*sp)); 552 free(sptmp, M_STATFS); 553 } else /* if (bufseg == UIO_USERSPACE) */ { 554 error = copyout(sp, sfsp, sizeof(*sp)); 555 free(sptmp, M_STATFS); 556 if (error != 0) { 557 vfs_unbusy(mp); 558 return (error); 559 } 560 } 561 sfsp++; 562 count++; 563 564 if (count == maxcount) { 565 vfs_unbusy(mp); 566 goto out; 567 } 568 569 mtx_lock(&mountlist_mtx); 570 nmp = TAILQ_NEXT(mp, mnt_list); 571 vfs_unbusy(mp); 572 } 573 mtx_unlock(&mountlist_mtx); 574 out: 575 *countp = count; 576 return (0); 577 } 578 579 #ifdef COMPAT_FREEBSD4 580 /* 581 * Get old format filesystem statistics. 582 */ 583 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 584 585 #ifndef _SYS_SYSPROTO_H_ 586 struct freebsd4_statfs_args { 587 char *path; 588 struct ostatfs *buf; 589 }; 590 #endif 591 int 592 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 593 { 594 struct ostatfs osb; 595 struct statfs *sfp; 596 int error; 597 598 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 599 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 600 if (error == 0) { 601 freebsd4_cvtstatfs(sfp, &osb); 602 error = copyout(&osb, uap->buf, sizeof(osb)); 603 } 604 free(sfp, M_STATFS); 605 return (error); 606 } 607 608 /* 609 * Get filesystem statistics. 610 */ 611 #ifndef _SYS_SYSPROTO_H_ 612 struct freebsd4_fstatfs_args { 613 int fd; 614 struct ostatfs *buf; 615 }; 616 #endif 617 int 618 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 619 { 620 struct ostatfs osb; 621 struct statfs *sfp; 622 int error; 623 624 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 625 error = kern_fstatfs(td, uap->fd, sfp); 626 if (error == 0) { 627 freebsd4_cvtstatfs(sfp, &osb); 628 error = copyout(&osb, uap->buf, sizeof(osb)); 629 } 630 free(sfp, M_STATFS); 631 return (error); 632 } 633 634 /* 635 * Get statistics on all filesystems. 636 */ 637 #ifndef _SYS_SYSPROTO_H_ 638 struct freebsd4_getfsstat_args { 639 struct ostatfs *buf; 640 long bufsize; 641 int mode; 642 }; 643 #endif 644 int 645 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 646 { 647 struct statfs *buf, *sp; 648 struct ostatfs osb; 649 size_t count, size; 650 int error; 651 652 if (uap->bufsize < 0) 653 return (EINVAL); 654 count = uap->bufsize / sizeof(struct ostatfs); 655 if (count > SIZE_MAX / sizeof(struct statfs)) 656 return (EINVAL); 657 size = count * sizeof(struct statfs); 658 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 659 uap->mode); 660 if (error == 0) 661 td->td_retval[0] = count; 662 if (size != 0) { 663 sp = buf; 664 while (count != 0 && error == 0) { 665 freebsd4_cvtstatfs(sp, &osb); 666 error = copyout(&osb, uap->buf, sizeof(osb)); 667 sp++; 668 uap->buf++; 669 count--; 670 } 671 free(buf, M_STATFS); 672 } 673 return (error); 674 } 675 676 /* 677 * Implement fstatfs() for (NFS) file handles. 678 */ 679 #ifndef _SYS_SYSPROTO_H_ 680 struct freebsd4_fhstatfs_args { 681 struct fhandle *u_fhp; 682 struct ostatfs *buf; 683 }; 684 #endif 685 int 686 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 687 { 688 struct ostatfs osb; 689 struct statfs *sfp; 690 fhandle_t fh; 691 int error; 692 693 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 694 if (error != 0) 695 return (error); 696 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 697 error = kern_fhstatfs(td, fh, sfp); 698 if (error == 0) { 699 freebsd4_cvtstatfs(sfp, &osb); 700 error = copyout(&osb, uap->buf, sizeof(osb)); 701 } 702 free(sfp, M_STATFS); 703 return (error); 704 } 705 706 /* 707 * Convert a new format statfs structure to an old format statfs structure. 708 */ 709 static void 710 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 711 { 712 713 statfs_scale_blocks(nsp, LONG_MAX); 714 bzero(osp, sizeof(*osp)); 715 osp->f_bsize = nsp->f_bsize; 716 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 717 osp->f_blocks = nsp->f_blocks; 718 osp->f_bfree = nsp->f_bfree; 719 osp->f_bavail = nsp->f_bavail; 720 osp->f_files = MIN(nsp->f_files, LONG_MAX); 721 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 722 osp->f_owner = nsp->f_owner; 723 osp->f_type = nsp->f_type; 724 osp->f_flags = nsp->f_flags; 725 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 726 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 727 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 728 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 729 strlcpy(osp->f_fstypename, nsp->f_fstypename, 730 MIN(MFSNAMELEN, OMFSNAMELEN)); 731 strlcpy(osp->f_mntonname, nsp->f_mntonname, 732 MIN(MNAMELEN, OMNAMELEN)); 733 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 734 MIN(MNAMELEN, OMNAMELEN)); 735 osp->f_fsid = nsp->f_fsid; 736 } 737 #endif /* COMPAT_FREEBSD4 */ 738 739 #if defined(COMPAT_FREEBSD11) 740 /* 741 * Get old format filesystem statistics. 742 */ 743 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 744 745 int 746 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 747 { 748 struct freebsd11_statfs osb; 749 struct statfs *sfp; 750 int error; 751 752 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 753 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 754 if (error == 0) { 755 freebsd11_cvtstatfs(sfp, &osb); 756 error = copyout(&osb, uap->buf, sizeof(osb)); 757 } 758 free(sfp, M_STATFS); 759 return (error); 760 } 761 762 /* 763 * Get filesystem statistics. 764 */ 765 int 766 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 767 { 768 struct freebsd11_statfs osb; 769 struct statfs *sfp; 770 int error; 771 772 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 773 error = kern_fstatfs(td, uap->fd, sfp); 774 if (error == 0) { 775 freebsd11_cvtstatfs(sfp, &osb); 776 error = copyout(&osb, uap->buf, sizeof(osb)); 777 } 778 free(sfp, M_STATFS); 779 return (error); 780 } 781 782 /* 783 * Get statistics on all filesystems. 784 */ 785 int 786 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 787 { 788 return (kern_freebsd11_getfsstat(td, uap->buf, uap->bufsize, uap->mode)); 789 } 790 791 int 792 kern_freebsd11_getfsstat(struct thread *td, struct freebsd11_statfs * ubuf, 793 long bufsize, int mode) 794 { 795 struct freebsd11_statfs osb; 796 struct statfs *buf, *sp; 797 size_t count, size; 798 int error; 799 800 if (bufsize < 0) 801 return (EINVAL); 802 803 count = bufsize / sizeof(struct ostatfs); 804 size = count * sizeof(struct statfs); 805 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, mode); 806 if (error == 0) 807 td->td_retval[0] = count; 808 if (size > 0) { 809 sp = buf; 810 while (count > 0 && error == 0) { 811 freebsd11_cvtstatfs(sp, &osb); 812 error = copyout(&osb, ubuf, sizeof(osb)); 813 sp++; 814 ubuf++; 815 count--; 816 } 817 free(buf, M_STATFS); 818 } 819 return (error); 820 } 821 822 /* 823 * Implement fstatfs() for (NFS) file handles. 824 */ 825 int 826 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 827 { 828 struct freebsd11_statfs osb; 829 struct statfs *sfp; 830 fhandle_t fh; 831 int error; 832 833 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 834 if (error) 835 return (error); 836 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 837 error = kern_fhstatfs(td, fh, sfp); 838 if (error == 0) { 839 freebsd11_cvtstatfs(sfp, &osb); 840 error = copyout(&osb, uap->buf, sizeof(osb)); 841 } 842 free(sfp, M_STATFS); 843 return (error); 844 } 845 846 /* 847 * Convert a new format statfs structure to an old format statfs structure. 848 */ 849 static void 850 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 851 { 852 853 bzero(osp, sizeof(*osp)); 854 osp->f_version = FREEBSD11_STATFS_VERSION; 855 osp->f_type = nsp->f_type; 856 osp->f_flags = nsp->f_flags; 857 osp->f_bsize = nsp->f_bsize; 858 osp->f_iosize = nsp->f_iosize; 859 osp->f_blocks = nsp->f_blocks; 860 osp->f_bfree = nsp->f_bfree; 861 osp->f_bavail = nsp->f_bavail; 862 osp->f_files = nsp->f_files; 863 osp->f_ffree = nsp->f_ffree; 864 osp->f_syncwrites = nsp->f_syncwrites; 865 osp->f_asyncwrites = nsp->f_asyncwrites; 866 osp->f_syncreads = nsp->f_syncreads; 867 osp->f_asyncreads = nsp->f_asyncreads; 868 osp->f_namemax = nsp->f_namemax; 869 osp->f_owner = nsp->f_owner; 870 osp->f_fsid = nsp->f_fsid; 871 strlcpy(osp->f_fstypename, nsp->f_fstypename, 872 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 873 strlcpy(osp->f_mntonname, nsp->f_mntonname, 874 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 875 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 876 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 877 } 878 #endif /* COMPAT_FREEBSD11 */ 879 880 /* 881 * Change current working directory to a given file descriptor. 882 */ 883 #ifndef _SYS_SYSPROTO_H_ 884 struct fchdir_args { 885 int fd; 886 }; 887 #endif 888 int 889 sys_fchdir(struct thread *td, struct fchdir_args *uap) 890 { 891 struct vnode *vp, *tdp; 892 struct mount *mp; 893 struct file *fp; 894 int error; 895 uint8_t fdflags; 896 897 AUDIT_ARG_FD(uap->fd); 898 error = getvnode_path(td, uap->fd, &cap_fchdir_rights, &fdflags, 899 &fp); 900 if (error != 0) 901 return (error); 902 if ((fdflags & UF_RESOLVE_BENEATH) != 0) { 903 fdrop(fp, td); 904 return (ENOTCAPABLE); 905 } 906 vp = fp->f_vnode; 907 vrefact(vp); 908 fdrop(fp, td); 909 vn_lock(vp, LK_SHARED | LK_RETRY); 910 AUDIT_ARG_VNODE1(vp); 911 error = change_dir(vp, td); 912 while (!error && (mp = vp->v_mountedhere) != NULL) { 913 if (vfs_busy(mp, 0)) 914 continue; 915 error = VFS_ROOT(mp, LK_SHARED, &tdp); 916 vfs_unbusy(mp); 917 if (error != 0) 918 break; 919 vput(vp); 920 vp = tdp; 921 } 922 if (error != 0) { 923 vput(vp); 924 return (error); 925 } 926 VOP_UNLOCK(vp); 927 pwd_chdir(td, vp); 928 return (0); 929 } 930 931 /* 932 * Change current working directory (``.''). 933 */ 934 #ifndef _SYS_SYSPROTO_H_ 935 struct chdir_args { 936 char *path; 937 }; 938 #endif 939 int 940 sys_chdir(struct thread *td, struct chdir_args *uap) 941 { 942 943 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 944 } 945 946 int 947 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg) 948 { 949 struct nameidata nd; 950 int error; 951 952 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 953 pathseg, path); 954 if ((error = namei(&nd)) != 0) 955 return (error); 956 if ((error = change_dir(nd.ni_vp, td)) != 0) { 957 vput(nd.ni_vp); 958 NDFREE_PNBUF(&nd); 959 return (error); 960 } 961 VOP_UNLOCK(nd.ni_vp); 962 NDFREE_PNBUF(&nd); 963 pwd_chdir(td, nd.ni_vp); 964 return (0); 965 } 966 967 static int unprivileged_chroot = 0; 968 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_chroot, CTLFLAG_RW, 969 &unprivileged_chroot, 0, 970 "Unprivileged processes can use chroot(2)"); 971 972 /* 973 * Takes locked vnode, unlocks it before returning. 974 */ 975 static int 976 kern_chroot(struct thread *td, struct vnode *vp) 977 { 978 struct proc *p; 979 int error; 980 981 error = priv_check(td, PRIV_VFS_CHROOT); 982 if (error != 0) { 983 p = td->td_proc; 984 if (unprivileged_chroot == 0) { 985 error = EXTERROR(EPERM, 986 "security.bsd.unprivileged_chroot sysctl not enabled"); 987 goto e_vunlock; 988 } 989 if ((p->p_flag2 & P2_NO_NEW_PRIVS) == 0) { 990 error = EXTERROR(EPERM, 991 "PROC_NO_NEW_PRIVS not enabled"); 992 goto e_vunlock; 993 } 994 } 995 996 error = change_dir(vp, td); 997 if (error != 0) 998 goto e_vunlock; 999 #ifdef MAC 1000 error = mac_vnode_check_chroot(td->td_ucred, vp); 1001 if (error != 0) 1002 goto e_vunlock; 1003 #endif 1004 VOP_UNLOCK(vp); 1005 error = pwd_chroot(td, vp); 1006 vrele(vp); 1007 return (error); 1008 e_vunlock: 1009 vput(vp); 1010 return (error); 1011 } 1012 1013 /* 1014 * Change notion of root (``/'') directory. 1015 */ 1016 #ifndef _SYS_SYSPROTO_H_ 1017 struct chroot_args { 1018 char *path; 1019 }; 1020 #endif 1021 int 1022 sys_chroot(struct thread *td, struct chroot_args *uap) 1023 { 1024 struct nameidata nd; 1025 int error; 1026 1027 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 1028 UIO_USERSPACE, uap->path); 1029 error = namei(&nd); 1030 if (error != 0) 1031 return (error); 1032 NDFREE_PNBUF(&nd); 1033 error = kern_chroot(td, nd.ni_vp); 1034 return (error); 1035 } 1036 1037 /* 1038 * Change notion of root directory to a given file descriptor. 1039 */ 1040 #ifndef _SYS_SYSPROTO_H_ 1041 struct fchroot_args { 1042 int fd; 1043 }; 1044 #endif 1045 int 1046 sys_fchroot(struct thread *td, struct fchroot_args *uap) 1047 { 1048 struct vnode *vp; 1049 struct file *fp; 1050 int error; 1051 uint8_t fdflags; 1052 1053 error = getvnode_path(td, uap->fd, &cap_fchroot_rights, &fdflags, &fp); 1054 if (error != 0) 1055 return (error); 1056 if ((fdflags & UF_RESOLVE_BENEATH) != 0) { 1057 fdrop(fp, td); 1058 return (ENOTCAPABLE); 1059 } 1060 vp = fp->f_vnode; 1061 vrefact(vp); 1062 fdrop(fp, td); 1063 vn_lock(vp, LK_SHARED | LK_RETRY); 1064 error = kern_chroot(td, vp); 1065 return (error); 1066 } 1067 1068 /* 1069 * Common routine for chroot and chdir. Callers must provide a locked vnode 1070 * instance. 1071 */ 1072 int 1073 change_dir(struct vnode *vp, struct thread *td) 1074 { 1075 #ifdef MAC 1076 int error; 1077 #endif 1078 1079 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 1080 if (vp->v_type != VDIR) 1081 return (ENOTDIR); 1082 #ifdef MAC 1083 error = mac_vnode_check_chdir(td->td_ucred, vp); 1084 if (error != 0) 1085 return (error); 1086 #endif 1087 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 1088 } 1089 1090 static __inline void 1091 flags_to_rights(int flags, cap_rights_t *rightsp) 1092 { 1093 if (flags & O_EXEC) { 1094 cap_rights_set_one(rightsp, CAP_FEXECVE); 1095 if (flags & O_PATH) 1096 return; 1097 } else { 1098 switch ((flags & O_ACCMODE)) { 1099 case O_RDONLY: 1100 cap_rights_set_one(rightsp, CAP_READ); 1101 break; 1102 case O_RDWR: 1103 cap_rights_set_one(rightsp, CAP_READ); 1104 /* FALLTHROUGH */ 1105 case O_WRONLY: 1106 cap_rights_set_one(rightsp, CAP_WRITE); 1107 if (!(flags & (O_APPEND | O_TRUNC))) 1108 cap_rights_set_one(rightsp, CAP_SEEK); 1109 break; 1110 } 1111 } 1112 1113 if (flags & O_CREAT) 1114 cap_rights_set_one(rightsp, CAP_CREATE); 1115 1116 if (flags & O_TRUNC) 1117 cap_rights_set_one(rightsp, CAP_FTRUNCATE); 1118 1119 if (flags & (O_SYNC | O_FSYNC | O_DSYNC)) 1120 cap_rights_set_one(rightsp, CAP_FSYNC); 1121 1122 if (flags & (O_EXLOCK | O_SHLOCK)) 1123 cap_rights_set_one(rightsp, CAP_FLOCK); 1124 } 1125 1126 /* 1127 * Check permissions, allocate an open file structure, and call the device 1128 * open routine if any. 1129 */ 1130 #ifndef _SYS_SYSPROTO_H_ 1131 struct open_args { 1132 char *path; 1133 int flags; 1134 int mode; 1135 }; 1136 #endif 1137 int 1138 sys_open(struct thread *td, struct open_args *uap) 1139 { 1140 1141 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1142 uap->flags, uap->mode)); 1143 } 1144 1145 #ifndef _SYS_SYSPROTO_H_ 1146 struct openat_args { 1147 int fd; 1148 char *path; 1149 int flag; 1150 int mode; 1151 }; 1152 #endif 1153 int 1154 sys_openat(struct thread *td, struct openat_args *uap) 1155 { 1156 1157 AUDIT_ARG_FD(uap->fd); 1158 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1159 uap->mode)); 1160 } 1161 1162 /* 1163 * Validate open(2) flags and convert access mode flags (O_RDONLY etc.) to their 1164 * in-kernel representations (FREAD etc.). 1165 */ 1166 static int 1167 openflags(int *flagsp) 1168 { 1169 int flags; 1170 1171 flags = *flagsp; 1172 if ((flags & ~FUSERALLOWED) != 0) 1173 return (EINVAL); 1174 1175 /* 1176 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1177 * may be specified. On the other hand, for O_PATH any mode 1178 * except O_EXEC is ignored. 1179 */ 1180 if ((flags & O_PATH) != 0) { 1181 flags &= ~O_ACCMODE; 1182 } else if ((flags & O_EXEC) != 0) { 1183 if ((flags & O_ACCMODE) != 0) 1184 return (EINVAL); 1185 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1186 return (EINVAL); 1187 } else { 1188 flags = FFLAGS(flags); 1189 } 1190 *flagsp = flags; 1191 return (0); 1192 } 1193 1194 static void 1195 finit_open(struct file *fp, struct vnode *vp, int flags) 1196 { 1197 /* 1198 * Store the vnode, for any f_type. Typically, the vnode use count is 1199 * decremented by a direct call to vnops.fo_close() for files that 1200 * switched type. 1201 */ 1202 fp->f_vnode = vp; 1203 1204 /* 1205 * If the file wasn't claimed by devfs or fifofs, bind it to the normal 1206 * vnode operations here. 1207 */ 1208 if (fp->f_ops == &badfileops) { 1209 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0, 1210 ("Unexpected fifo fp %p vp %p", fp, vp)); 1211 if ((flags & O_PATH) != 0) { 1212 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED), 1213 DTYPE_VNODE, NULL, &path_fileops); 1214 } else { 1215 finit_vnode(fp, flags, NULL, &vnops); 1216 } 1217 } 1218 } 1219 1220 /* 1221 * If fpp != NULL, opened file is not installed into the file 1222 * descriptor table, instead it is returned in *fpp. This is 1223 * incompatible with fdopen(), in which case we return EINVAL. 1224 */ 1225 static int 1226 openatfp(struct thread *td, int dirfd, const char *path, 1227 enum uio_seg pathseg, int flags, int mode, struct file **fpp) 1228 { 1229 struct proc *p; 1230 struct filedesc *fdp; 1231 struct pwddesc *pdp; 1232 struct file *fp; 1233 struct vnode *vp; 1234 struct filecaps *fcaps; 1235 struct nameidata nd; 1236 cap_rights_t rights; 1237 int cmode, error, indx; 1238 1239 indx = -1; 1240 p = td->td_proc; 1241 fdp = p->p_fd; 1242 pdp = p->p_pd; 1243 1244 AUDIT_ARG_FFLAGS(flags); 1245 AUDIT_ARG_MODE(mode); 1246 cap_rights_init_one(&rights, CAP_LOOKUP); 1247 flags_to_rights(flags, &rights); 1248 1249 error = openflags(&flags); 1250 if (error != 0) 1251 return (error); 1252 1253 /* 1254 * Allocate a file structure. The descriptor to reference it 1255 * is allocated and used by finstall_refed() below. 1256 */ 1257 error = falloc_noinstall(td, &fp); 1258 if (error != 0) 1259 return (error); 1260 /* Set the flags early so the finit in devfs can pick them up. */ 1261 fp->f_flag = flags & FMASK; 1262 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT; 1263 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | WANTIOCTLCAPS, 1264 pathseg, path, dirfd, &rights); 1265 td->td_dupfd = -1; /* XXX check for fdopen */ 1266 error = vn_open_cred(&nd, &flags, cmode, VN_OPEN_WANTIOCTLCAPS, 1267 td->td_ucred, fp); 1268 if (error != 0) { 1269 /* 1270 * If the vn_open replaced the method vector, something 1271 * wonderous happened deep below and we just pass it up 1272 * pretending we know what we do. 1273 */ 1274 if (error == ENXIO && fp->f_ops != &badfileops) { 1275 MPASS((flags & O_PATH) == 0); 1276 goto success; 1277 } 1278 1279 /* 1280 * Handle special fdopen() case. bleh. 1281 * 1282 * Don't do this for relative (capability) lookups; we don't 1283 * understand exactly what would happen, and we don't think 1284 * that it ever should. 1285 */ 1286 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 && 1287 (error == ENODEV || error == ENXIO) && 1288 td->td_dupfd >= 0) { 1289 MPASS(fpp == NULL); 1290 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1291 &indx); 1292 if (error == 0) 1293 goto success; 1294 } 1295 1296 goto bad; 1297 } 1298 td->td_dupfd = 0; 1299 NDFREE_PNBUF(&nd); 1300 vp = nd.ni_vp; 1301 1302 finit_open(fp, vp, flags); 1303 VOP_UNLOCK(vp); 1304 if (flags & O_TRUNC) { 1305 error = fo_truncate(fp, 0, td->td_ucred, td); 1306 if (error != 0) 1307 goto bad; 1308 } 1309 success: 1310 if (fpp != NULL) { 1311 MPASS(error == 0); 1312 NDFREE_IOCTLCAPS(&nd); 1313 *fpp = fp; 1314 return (0); 1315 } 1316 1317 /* 1318 * If we haven't already installed the FD (for dupfdopen), do so now. 1319 */ 1320 if (indx == -1) { 1321 #ifdef CAPABILITIES 1322 if ((nd.ni_resflags & NIRES_STRICTREL) != 0) 1323 fcaps = &nd.ni_filecaps; 1324 else 1325 #endif 1326 fcaps = NULL; 1327 if ((nd.ni_resflags & NIRES_BENEATH) != 0) 1328 flags |= O_RESOLVE_BENEATH; 1329 else 1330 flags &= ~O_RESOLVE_BENEATH; 1331 error = finstall_refed(td, fp, &indx, flags, fcaps); 1332 /* On success finstall_refed() consumes fcaps. */ 1333 if (error != 0) { 1334 goto bad; 1335 } 1336 } else { 1337 NDFREE_IOCTLCAPS(&nd); 1338 falloc_abort(td, fp); 1339 } 1340 1341 td->td_retval[0] = indx; 1342 return (0); 1343 bad: 1344 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1345 NDFREE_IOCTLCAPS(&nd); 1346 falloc_abort(td, fp); 1347 return (error); 1348 } 1349 1350 int 1351 kern_openat(struct thread *td, int dirfd, const char *path, 1352 enum uio_seg pathseg, int flags, int mode) 1353 { 1354 return (openatfp(td, dirfd, path, pathseg, flags, mode, NULL)); 1355 } 1356 1357 int 1358 kern_openatfp(struct thread *td, int dirfd, const char *path, 1359 enum uio_seg pathseg, int flags, int mode, struct file **fpp) 1360 { 1361 int error, old_dupfd; 1362 1363 old_dupfd = td->td_dupfd; 1364 td->td_dupfd = -1; 1365 error = openatfp(td, dirfd, path, pathseg, flags, mode, fpp); 1366 td->td_dupfd = old_dupfd; 1367 return (error); 1368 } 1369 1370 #ifdef COMPAT_43 1371 /* 1372 * Create a file. 1373 */ 1374 #ifndef _SYS_SYSPROTO_H_ 1375 struct ocreat_args { 1376 char *path; 1377 int mode; 1378 }; 1379 #endif 1380 int 1381 ocreat(struct thread *td, struct ocreat_args *uap) 1382 { 1383 1384 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1385 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1386 } 1387 #endif /* COMPAT_43 */ 1388 1389 /* 1390 * Create a special file. 1391 */ 1392 #ifndef _SYS_SYSPROTO_H_ 1393 struct mknodat_args { 1394 int fd; 1395 char *path; 1396 mode_t mode; 1397 dev_t dev; 1398 }; 1399 #endif 1400 int 1401 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1402 { 1403 1404 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1405 uap->dev)); 1406 } 1407 1408 #if defined(COMPAT_FREEBSD11) 1409 int 1410 freebsd11_mknod(struct thread *td, 1411 struct freebsd11_mknod_args *uap) 1412 { 1413 1414 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1415 uap->mode, uap->dev)); 1416 } 1417 1418 int 1419 freebsd11_mknodat(struct thread *td, 1420 struct freebsd11_mknodat_args *uap) 1421 { 1422 1423 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1424 uap->dev)); 1425 } 1426 #endif /* COMPAT_FREEBSD11 */ 1427 1428 int 1429 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1430 int mode, dev_t dev) 1431 { 1432 struct vnode *vp; 1433 struct mount *mp; 1434 struct vattr vattr; 1435 struct nameidata nd; 1436 int error, whiteout = 0; 1437 1438 AUDIT_ARG_MODE(mode); 1439 AUDIT_ARG_DEV(dev); 1440 switch (mode & S_IFMT) { 1441 case S_IFCHR: 1442 case S_IFBLK: 1443 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1444 if (error == 0 && dev == VNOVAL) 1445 error = EINVAL; 1446 break; 1447 case S_IFWHT: 1448 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1449 break; 1450 case S_IFIFO: 1451 if (dev == 0) 1452 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1453 /* FALLTHROUGH */ 1454 default: 1455 error = EINVAL; 1456 break; 1457 } 1458 if (error != 0) 1459 return (error); 1460 NDPREINIT(&nd); 1461 restart: 1462 bwillwrite(); 1463 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE, 1464 pathseg, path, fd, &cap_mknodat_rights); 1465 if ((error = namei(&nd)) != 0) 1466 return (error); 1467 vp = nd.ni_vp; 1468 if (vp != NULL) { 1469 NDFREE_PNBUF(&nd); 1470 if (vp == nd.ni_dvp) 1471 vrele(nd.ni_dvp); 1472 else 1473 vput(nd.ni_dvp); 1474 vrele(vp); 1475 return (EEXIST); 1476 } else if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 1477 NDFREE_PNBUF(&nd); 1478 vput(nd.ni_dvp); 1479 return (EINVAL); 1480 } else { 1481 VATTR_NULL(&vattr); 1482 vattr.va_mode = (mode & ALLPERMS) & 1483 ~td->td_proc->p_pd->pd_cmask; 1484 vattr.va_rdev = dev; 1485 whiteout = 0; 1486 1487 switch (mode & S_IFMT) { 1488 case S_IFCHR: 1489 vattr.va_type = VCHR; 1490 break; 1491 case S_IFBLK: 1492 vattr.va_type = VBLK; 1493 break; 1494 case S_IFWHT: 1495 whiteout = 1; 1496 break; 1497 default: 1498 panic("kern_mknod: invalid mode"); 1499 } 1500 } 1501 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1502 NDFREE_PNBUF(&nd); 1503 vput(nd.ni_dvp); 1504 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 1505 return (error); 1506 goto restart; 1507 } 1508 #ifdef MAC 1509 if (error == 0 && !whiteout) 1510 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1511 &nd.ni_cnd, &vattr); 1512 #endif 1513 if (error == 0) { 1514 if (whiteout) 1515 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1516 else { 1517 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1518 &nd.ni_cnd, &vattr); 1519 } 1520 } 1521 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL, 1522 true); 1523 vn_finished_write(mp); 1524 NDFREE_PNBUF(&nd); 1525 if (error == ERELOOKUP) 1526 goto restart; 1527 return (error); 1528 } 1529 1530 /* 1531 * Create a named pipe. 1532 */ 1533 #ifndef _SYS_SYSPROTO_H_ 1534 struct mkfifo_args { 1535 char *path; 1536 int mode; 1537 }; 1538 #endif 1539 int 1540 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1541 { 1542 1543 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1544 uap->mode)); 1545 } 1546 1547 #ifndef _SYS_SYSPROTO_H_ 1548 struct mkfifoat_args { 1549 int fd; 1550 char *path; 1551 mode_t mode; 1552 }; 1553 #endif 1554 int 1555 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1556 { 1557 1558 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1559 uap->mode)); 1560 } 1561 1562 int 1563 kern_mkfifoat(struct thread *td, int fd, const char *path, 1564 enum uio_seg pathseg, int mode) 1565 { 1566 struct mount *mp; 1567 struct vattr vattr; 1568 struct nameidata nd; 1569 int error; 1570 1571 AUDIT_ARG_MODE(mode); 1572 NDPREINIT(&nd); 1573 restart: 1574 bwillwrite(); 1575 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE, 1576 pathseg, path, fd, &cap_mkfifoat_rights); 1577 if ((error = namei(&nd)) != 0) 1578 return (error); 1579 if (nd.ni_vp != NULL) { 1580 NDFREE_PNBUF(&nd); 1581 if (nd.ni_vp == nd.ni_dvp) 1582 vrele(nd.ni_dvp); 1583 else 1584 vput(nd.ni_dvp); 1585 vrele(nd.ni_vp); 1586 return (EEXIST); 1587 } 1588 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 1589 NDFREE_PNBUF(&nd); 1590 vput(nd.ni_dvp); 1591 return (EINVAL); 1592 } 1593 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1594 NDFREE_PNBUF(&nd); 1595 vput(nd.ni_dvp); 1596 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 1597 return (error); 1598 goto restart; 1599 } 1600 VATTR_NULL(&vattr); 1601 vattr.va_type = VFIFO; 1602 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask; 1603 #ifdef MAC 1604 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1605 &vattr); 1606 if (error != 0) 1607 goto out; 1608 #endif 1609 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1610 #ifdef MAC 1611 out: 1612 #endif 1613 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1614 vn_finished_write(mp); 1615 NDFREE_PNBUF(&nd); 1616 if (error == ERELOOKUP) 1617 goto restart; 1618 return (error); 1619 } 1620 1621 /* 1622 * Make a hard file link. 1623 */ 1624 #ifndef _SYS_SYSPROTO_H_ 1625 struct link_args { 1626 char *path; 1627 char *link; 1628 }; 1629 #endif 1630 int 1631 sys_link(struct thread *td, struct link_args *uap) 1632 { 1633 1634 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1635 UIO_USERSPACE, AT_SYMLINK_FOLLOW)); 1636 } 1637 1638 #ifndef _SYS_SYSPROTO_H_ 1639 struct linkat_args { 1640 int fd1; 1641 char *path1; 1642 int fd2; 1643 char *path2; 1644 int flag; 1645 }; 1646 #endif 1647 int 1648 sys_linkat(struct thread *td, struct linkat_args *uap) 1649 { 1650 1651 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1652 UIO_USERSPACE, uap->flag)); 1653 } 1654 1655 int hardlink_check_uid = 0; 1656 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1657 &hardlink_check_uid, 0, 1658 "Unprivileged processes cannot create hard links to files owned by other " 1659 "users"); 1660 static int hardlink_check_gid = 0; 1661 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1662 &hardlink_check_gid, 0, 1663 "Unprivileged processes cannot create hard links to files owned by other " 1664 "groups"); 1665 1666 static int 1667 can_hardlink(struct vnode *vp, struct ucred *cred) 1668 { 1669 struct vattr va; 1670 int error; 1671 1672 if (!hardlink_check_uid && !hardlink_check_gid) 1673 return (0); 1674 1675 error = VOP_GETATTR(vp, &va, cred); 1676 if (error != 0) 1677 return (error); 1678 1679 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1680 error = priv_check_cred(cred, PRIV_VFS_LINK); 1681 if (error != 0) 1682 return (error); 1683 } 1684 1685 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1686 error = priv_check_cred(cred, PRIV_VFS_LINK); 1687 if (error != 0) 1688 return (error); 1689 } 1690 1691 return (0); 1692 } 1693 1694 int 1695 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1696 const char *path2, enum uio_seg segflag, int flag) 1697 { 1698 struct nameidata nd; 1699 int error; 1700 1701 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | 1702 AT_EMPTY_PATH)) != 0) 1703 return (EINVAL); 1704 1705 NDPREINIT(&nd); 1706 do { 1707 bwillwrite(); 1708 NDINIT_ATRIGHTS(&nd, LOOKUP, AUDITVNODE1 | at2cnpflags(flag, 1709 AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | AT_EMPTY_PATH), 1710 segflag, path1, fd1, &cap_linkat_source_rights); 1711 if ((error = namei(&nd)) != 0) 1712 return (error); 1713 NDFREE_PNBUF(&nd); 1714 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) { 1715 error = priv_check(td, PRIV_VFS_FHOPEN); 1716 if (error != 0) { 1717 vrele(nd.ni_vp); 1718 return (error); 1719 } 1720 } 1721 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1722 } while (error == EAGAIN || error == ERELOOKUP); 1723 return (error); 1724 } 1725 1726 static int 1727 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1728 enum uio_seg segflag) 1729 { 1730 struct nameidata nd; 1731 struct mount *mp; 1732 int error; 1733 1734 if (vp->v_type == VDIR) { 1735 vrele(vp); 1736 return (EPERM); /* POSIX */ 1737 } 1738 if ((vn_irflag_read(vp) & (VIRF_NAMEDDIR | VIRF_NAMEDATTR)) != 0) { 1739 vrele(vp); 1740 return (EINVAL); 1741 } 1742 NDINIT_ATRIGHTS(&nd, CREATE, 1743 LOCKPARENT | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1744 &cap_linkat_target_rights); 1745 if ((error = namei(&nd)) == 0) { 1746 if (nd.ni_vp != NULL) { 1747 NDFREE_PNBUF(&nd); 1748 if (nd.ni_dvp == nd.ni_vp) 1749 vrele(nd.ni_dvp); 1750 else 1751 vput(nd.ni_dvp); 1752 vrele(nd.ni_vp); 1753 vrele(vp); 1754 return (EEXIST); 1755 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1756 /* 1757 * Cross-device link. No need to recheck 1758 * vp->v_type, since it cannot change, except 1759 * to VBAD. 1760 */ 1761 NDFREE_PNBUF(&nd); 1762 vput(nd.ni_dvp); 1763 vrele(vp); 1764 return (EXDEV); 1765 } else if (vn_lock(vp, LK_EXCLUSIVE) == 0) { 1766 error = can_hardlink(vp, td->td_ucred); 1767 #ifdef MAC 1768 if (error == 0) 1769 error = mac_vnode_check_link(td->td_ucred, 1770 nd.ni_dvp, vp, &nd.ni_cnd); 1771 #endif 1772 if (error != 0) { 1773 vput(vp); 1774 vput(nd.ni_dvp); 1775 NDFREE_PNBUF(&nd); 1776 return (error); 1777 } 1778 error = vn_start_write(vp, &mp, V_NOWAIT); 1779 if (error != 0) { 1780 vput(vp); 1781 vput(nd.ni_dvp); 1782 NDFREE_PNBUF(&nd); 1783 error = vn_start_write(NULL, &mp, 1784 V_XSLEEP | V_PCATCH); 1785 if (error != 0) 1786 return (error); 1787 return (EAGAIN); 1788 } 1789 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1790 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true); 1791 vn_finished_write(mp); 1792 NDFREE_PNBUF(&nd); 1793 vp = NULL; 1794 } else { 1795 vput(nd.ni_dvp); 1796 NDFREE_PNBUF(&nd); 1797 vrele(vp); 1798 return (EAGAIN); 1799 } 1800 } 1801 if (vp != NULL) 1802 vrele(vp); 1803 return (error); 1804 } 1805 1806 /* 1807 * Make a symbolic link. 1808 */ 1809 #ifndef _SYS_SYSPROTO_H_ 1810 struct symlink_args { 1811 char *path; 1812 char *link; 1813 }; 1814 #endif 1815 int 1816 sys_symlink(struct thread *td, struct symlink_args *uap) 1817 { 1818 1819 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1820 UIO_USERSPACE)); 1821 } 1822 1823 #ifndef _SYS_SYSPROTO_H_ 1824 struct symlinkat_args { 1825 char *path; 1826 int fd; 1827 char *path2; 1828 }; 1829 #endif 1830 int 1831 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1832 { 1833 1834 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1835 UIO_USERSPACE)); 1836 } 1837 1838 int 1839 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1840 enum uio_seg segflg) 1841 { 1842 struct mount *mp; 1843 struct vattr vattr; 1844 const char *syspath; 1845 char *tmppath; 1846 struct nameidata nd; 1847 int error; 1848 1849 if (segflg == UIO_SYSSPACE) { 1850 syspath = path1; 1851 } else { 1852 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1853 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1854 goto out; 1855 syspath = tmppath; 1856 } 1857 AUDIT_ARG_TEXT(syspath); 1858 NDPREINIT(&nd); 1859 restart: 1860 bwillwrite(); 1861 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE, segflg, 1862 path2, fd, &cap_symlinkat_rights); 1863 if ((error = namei(&nd)) != 0) 1864 goto out; 1865 if (nd.ni_vp) { 1866 NDFREE_PNBUF(&nd); 1867 if (nd.ni_vp == nd.ni_dvp) 1868 vrele(nd.ni_dvp); 1869 else 1870 vput(nd.ni_dvp); 1871 vrele(nd.ni_vp); 1872 nd.ni_vp = NULL; 1873 error = EEXIST; 1874 goto out; 1875 } 1876 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1877 NDFREE_PNBUF(&nd); 1878 vput(nd.ni_dvp); 1879 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 1880 goto out; 1881 goto restart; 1882 } 1883 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 1884 error = EINVAL; 1885 goto out2; 1886 } 1887 VATTR_NULL(&vattr); 1888 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask; 1889 #ifdef MAC 1890 vattr.va_type = VLNK; 1891 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1892 &vattr); 1893 if (error != 0) 1894 goto out2; 1895 #endif 1896 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1897 out2: 1898 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1899 vn_finished_write(mp); 1900 NDFREE_PNBUF(&nd); 1901 if (error == ERELOOKUP) 1902 goto restart; 1903 out: 1904 if (segflg != UIO_SYSSPACE) 1905 uma_zfree(namei_zone, tmppath); 1906 return (error); 1907 } 1908 1909 /* 1910 * Delete a whiteout from the filesystem. 1911 */ 1912 #ifndef _SYS_SYSPROTO_H_ 1913 struct undelete_args { 1914 char *path; 1915 }; 1916 #endif 1917 int 1918 sys_undelete(struct thread *td, struct undelete_args *uap) 1919 { 1920 struct mount *mp; 1921 struct nameidata nd; 1922 int error; 1923 1924 NDPREINIT(&nd); 1925 restart: 1926 bwillwrite(); 1927 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1928 UIO_USERSPACE, uap->path); 1929 error = namei(&nd); 1930 if (error != 0) 1931 return (error); 1932 1933 if (nd.ni_vp != NULL || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1934 NDFREE_PNBUF(&nd); 1935 if (nd.ni_vp == nd.ni_dvp) 1936 vrele(nd.ni_dvp); 1937 else 1938 vput(nd.ni_dvp); 1939 if (nd.ni_vp) 1940 vrele(nd.ni_vp); 1941 return (EEXIST); 1942 } 1943 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1944 NDFREE_PNBUF(&nd); 1945 vput(nd.ni_dvp); 1946 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 1947 return (error); 1948 goto restart; 1949 } 1950 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1951 NDFREE_PNBUF(&nd); 1952 vput(nd.ni_dvp); 1953 vn_finished_write(mp); 1954 if (error == ERELOOKUP) 1955 goto restart; 1956 return (error); 1957 } 1958 1959 /* 1960 * Delete a name from the filesystem. 1961 */ 1962 #ifndef _SYS_SYSPROTO_H_ 1963 struct unlink_args { 1964 char *path; 1965 }; 1966 #endif 1967 int 1968 sys_unlink(struct thread *td, struct unlink_args *uap) 1969 { 1970 1971 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1972 0, 0)); 1973 } 1974 1975 static int 1976 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1977 int flags, enum uio_seg pathseg, ino_t oldinum) 1978 { 1979 1980 if ((flags & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0) 1981 return (EINVAL); 1982 1983 if ((flags & AT_REMOVEDIR) != 0) 1984 return (kern_frmdirat(td, dfd, path, fd, pathseg, 1985 flags & ~AT_REMOVEDIR)); 1986 1987 return (kern_funlinkat(td, dfd, path, fd, pathseg, flags, 0)); 1988 } 1989 1990 #ifndef _SYS_SYSPROTO_H_ 1991 struct unlinkat_args { 1992 int fd; 1993 char *path; 1994 int flag; 1995 }; 1996 #endif 1997 int 1998 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1999 { 2000 2001 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 2002 UIO_USERSPACE, 0)); 2003 } 2004 2005 #ifndef _SYS_SYSPROTO_H_ 2006 struct funlinkat_args { 2007 int dfd; 2008 const char *path; 2009 int fd; 2010 int flag; 2011 }; 2012 #endif 2013 int 2014 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 2015 { 2016 2017 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 2018 UIO_USERSPACE, 0)); 2019 } 2020 2021 int 2022 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 2023 enum uio_seg pathseg, int flag, ino_t oldinum) 2024 { 2025 struct mount *mp; 2026 struct file *fp; 2027 struct vnode *vp; 2028 struct nameidata nd; 2029 struct stat sb; 2030 int error; 2031 2032 fp = NULL; 2033 if (fd != FD_NONE) { 2034 error = getvnode_path(td, fd, &cap_no_rights, NULL, &fp); 2035 if (error != 0) 2036 return (error); 2037 } 2038 2039 NDPREINIT(&nd); 2040 restart: 2041 bwillwrite(); 2042 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 2043 at2cnpflags(flag, AT_RESOLVE_BENEATH), 2044 pathseg, path, dfd, &cap_unlinkat_rights); 2045 if ((error = namei(&nd)) != 0) { 2046 if (error == EINVAL) 2047 error = EPERM; 2048 goto fdout; 2049 } 2050 vp = nd.ni_vp; 2051 if (vp->v_type == VDIR && oldinum == 0) { 2052 error = EPERM; /* POSIX */ 2053 } else if (oldinum != 0 && 2054 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED)) == 0) && 2055 sb.st_ino != oldinum) { 2056 error = EIDRM; /* Identifier removed */ 2057 } else if (fp != NULL && fp->f_vnode != vp) { 2058 if (VN_IS_DOOMED(fp->f_vnode)) 2059 error = EBADF; 2060 else 2061 error = EDEADLK; 2062 } else { 2063 /* 2064 * The root of a mounted filesystem cannot be deleted. 2065 * 2066 * XXX: can this only be a VDIR case? 2067 */ 2068 if (vp->v_vflag & VV_ROOT) 2069 error = EBUSY; 2070 } 2071 if (error == 0) { 2072 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 2073 NDFREE_PNBUF(&nd); 2074 vput(nd.ni_dvp); 2075 if (vp == nd.ni_dvp) 2076 vrele(vp); 2077 else 2078 vput(vp); 2079 if ((error = vn_start_write(NULL, &mp, 2080 V_XSLEEP | V_PCATCH)) != 0) { 2081 goto fdout; 2082 } 2083 goto restart; 2084 } 2085 #ifdef MAC 2086 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 2087 &nd.ni_cnd); 2088 if (error != 0) 2089 goto out; 2090 #endif 2091 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 2092 #ifdef MAC 2093 out: 2094 #endif 2095 vn_finished_write(mp); 2096 } 2097 NDFREE_PNBUF(&nd); 2098 vput(nd.ni_dvp); 2099 if (vp == nd.ni_dvp) 2100 vrele(vp); 2101 else 2102 vput(vp); 2103 if (error == ERELOOKUP) 2104 goto restart; 2105 fdout: 2106 if (fp != NULL) 2107 fdrop(fp, td); 2108 return (error); 2109 } 2110 2111 /* 2112 * Reposition read/write file offset. 2113 */ 2114 #ifndef _SYS_SYSPROTO_H_ 2115 struct lseek_args { 2116 int fd; 2117 int pad; 2118 off_t offset; 2119 int whence; 2120 }; 2121 #endif 2122 int 2123 sys_lseek(struct thread *td, struct lseek_args *uap) 2124 { 2125 2126 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2127 } 2128 2129 int 2130 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 2131 { 2132 struct file *fp; 2133 int error; 2134 2135 AUDIT_ARG_FD(fd); 2136 error = fget(td, fd, &cap_seek_rights, &fp); 2137 if (error != 0) 2138 return (error); 2139 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 2140 fo_seek(fp, offset, whence, td) : ESPIPE; 2141 fdrop(fp, td); 2142 return (error); 2143 } 2144 2145 #if defined(COMPAT_43) 2146 /* 2147 * Reposition read/write file offset. 2148 */ 2149 #ifndef _SYS_SYSPROTO_H_ 2150 struct olseek_args { 2151 int fd; 2152 long offset; 2153 int whence; 2154 }; 2155 #endif 2156 int 2157 olseek(struct thread *td, struct olseek_args *uap) 2158 { 2159 2160 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2161 } 2162 #endif /* COMPAT_43 */ 2163 2164 #if defined(COMPAT_FREEBSD6) 2165 /* Version with the 'pad' argument */ 2166 int 2167 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 2168 { 2169 2170 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2171 } 2172 #endif 2173 2174 /* 2175 * Check access permissions using passed credentials. 2176 */ 2177 static int 2178 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 2179 struct thread *td) 2180 { 2181 accmode_t accmode; 2182 int error; 2183 2184 /* Flags == 0 means only check for existence. */ 2185 if (user_flags == 0) 2186 return (0); 2187 2188 accmode = 0; 2189 if (user_flags & R_OK) 2190 accmode |= VREAD; 2191 if (user_flags & W_OK) 2192 accmode |= VWRITE; 2193 if (user_flags & X_OK) 2194 accmode |= VEXEC; 2195 #ifdef MAC 2196 error = mac_vnode_check_access(cred, vp, accmode); 2197 if (error != 0) 2198 return (error); 2199 #endif 2200 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 2201 error = VOP_ACCESS(vp, accmode, cred, td); 2202 return (error); 2203 } 2204 2205 /* 2206 * Check access permissions using "real" credentials. 2207 */ 2208 #ifndef _SYS_SYSPROTO_H_ 2209 struct access_args { 2210 char *path; 2211 int amode; 2212 }; 2213 #endif 2214 int 2215 sys_access(struct thread *td, struct access_args *uap) 2216 { 2217 2218 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2219 0, uap->amode)); 2220 } 2221 2222 #ifndef _SYS_SYSPROTO_H_ 2223 struct faccessat_args { 2224 int dirfd; 2225 char *path; 2226 int amode; 2227 int flag; 2228 } 2229 #endif 2230 int 2231 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2232 { 2233 2234 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2235 uap->amode)); 2236 } 2237 2238 int 2239 kern_accessat(struct thread *td, int fd, const char *path, 2240 enum uio_seg pathseg, int flag, int amode) 2241 { 2242 struct ucred *cred, *usecred; 2243 struct vnode *vp; 2244 struct nameidata nd; 2245 int error; 2246 2247 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH | 2248 AT_SYMLINK_NOFOLLOW)) != 0) 2249 return (EINVAL); 2250 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2251 return (EINVAL); 2252 2253 /* 2254 * Create and modify a temporary credential instead of one that 2255 * is potentially shared (if we need one). 2256 */ 2257 cred = td->td_ucred; 2258 if ((flag & AT_EACCESS) == 0 && 2259 ((cred->cr_uid != cred->cr_ruid || 2260 cred->cr_rgid != cred->cr_gid))) { 2261 usecred = crdup(cred); 2262 usecred->cr_uid = cred->cr_ruid; 2263 usecred->cr_gid = cred->cr_rgid; 2264 td->td_ucred = usecred; 2265 } else 2266 usecred = cred; 2267 AUDIT_ARG_VALUE(amode); 2268 NDINIT_ATRIGHTS(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | 2269 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | AT_SYMLINK_NOFOLLOW | 2270 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights); 2271 if ((error = namei(&nd)) != 0) 2272 goto out; 2273 vp = nd.ni_vp; 2274 2275 error = vn_access(vp, amode, usecred, td); 2276 NDFREE_PNBUF(&nd); 2277 vput(vp); 2278 out: 2279 if (usecred != cred) { 2280 td->td_ucred = cred; 2281 crfree(usecred); 2282 } 2283 return (error); 2284 } 2285 2286 /* 2287 * Check access permissions using "effective" credentials. 2288 */ 2289 #ifndef _SYS_SYSPROTO_H_ 2290 struct eaccess_args { 2291 char *path; 2292 int amode; 2293 }; 2294 #endif 2295 int 2296 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2297 { 2298 2299 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2300 AT_EACCESS, uap->amode)); 2301 } 2302 2303 #if defined(COMPAT_43) 2304 /* 2305 * Get file status; this version follows links. 2306 */ 2307 #ifndef _SYS_SYSPROTO_H_ 2308 struct ostat_args { 2309 char *path; 2310 struct ostat *ub; 2311 }; 2312 #endif 2313 int 2314 ostat(struct thread *td, struct ostat_args *uap) 2315 { 2316 struct stat sb; 2317 struct ostat osb; 2318 int error; 2319 2320 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb); 2321 if (error != 0) 2322 return (error); 2323 cvtstat(&sb, &osb); 2324 return (copyout(&osb, uap->ub, sizeof (osb))); 2325 } 2326 2327 /* 2328 * Get file status; this version does not follow links. 2329 */ 2330 #ifndef _SYS_SYSPROTO_H_ 2331 struct olstat_args { 2332 char *path; 2333 struct ostat *ub; 2334 }; 2335 #endif 2336 int 2337 olstat(struct thread *td, struct olstat_args *uap) 2338 { 2339 struct stat sb; 2340 struct ostat osb; 2341 int error; 2342 2343 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2344 UIO_USERSPACE, &sb); 2345 if (error != 0) 2346 return (error); 2347 cvtstat(&sb, &osb); 2348 return (copyout(&osb, uap->ub, sizeof (osb))); 2349 } 2350 2351 /* 2352 * Convert from an old to a new stat structure. 2353 * XXX: many values are blindly truncated. 2354 */ 2355 void 2356 cvtstat(struct stat *st, struct ostat *ost) 2357 { 2358 2359 bzero(ost, sizeof(*ost)); 2360 ost->st_dev = st->st_dev; 2361 ost->st_ino = st->st_ino; 2362 ost->st_mode = st->st_mode; 2363 ost->st_nlink = st->st_nlink; 2364 ost->st_uid = st->st_uid; 2365 ost->st_gid = st->st_gid; 2366 ost->st_rdev = st->st_rdev; 2367 ost->st_size = MIN(st->st_size, INT32_MAX); 2368 ost->st_atim = st->st_atim; 2369 ost->st_mtim = st->st_mtim; 2370 ost->st_ctim = st->st_ctim; 2371 ost->st_blksize = st->st_blksize; 2372 ost->st_blocks = st->st_blocks; 2373 ost->st_flags = st->st_flags; 2374 ost->st_gen = st->st_gen; 2375 } 2376 #endif /* COMPAT_43 */ 2377 2378 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2379 int ino64_trunc_error; 2380 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2381 &ino64_trunc_error, 0, 2382 "Error on truncation of device, file or inode number, or link count"); 2383 2384 int 2385 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2386 { 2387 2388 ost->st_dev = st->st_dev; 2389 if (ost->st_dev != st->st_dev) { 2390 switch (ino64_trunc_error) { 2391 default: 2392 /* 2393 * Since dev_t is almost raw, don't clamp to the 2394 * maximum for case 2, but ignore the error. 2395 */ 2396 break; 2397 case 1: 2398 return (EOVERFLOW); 2399 } 2400 } 2401 ost->st_ino = st->st_ino; 2402 if (ost->st_ino != st->st_ino) { 2403 switch (ino64_trunc_error) { 2404 default: 2405 case 0: 2406 break; 2407 case 1: 2408 return (EOVERFLOW); 2409 case 2: 2410 ost->st_ino = UINT32_MAX; 2411 break; 2412 } 2413 } 2414 ost->st_mode = st->st_mode; 2415 ost->st_nlink = st->st_nlink; 2416 if (ost->st_nlink != st->st_nlink) { 2417 switch (ino64_trunc_error) { 2418 default: 2419 case 0: 2420 break; 2421 case 1: 2422 return (EOVERFLOW); 2423 case 2: 2424 ost->st_nlink = UINT16_MAX; 2425 break; 2426 } 2427 } 2428 ost->st_uid = st->st_uid; 2429 ost->st_gid = st->st_gid; 2430 ost->st_rdev = st->st_rdev; 2431 if (ost->st_rdev != st->st_rdev) { 2432 switch (ino64_trunc_error) { 2433 default: 2434 break; 2435 case 1: 2436 return (EOVERFLOW); 2437 } 2438 } 2439 ost->st_atim = st->st_atim; 2440 ost->st_mtim = st->st_mtim; 2441 ost->st_ctim = st->st_ctim; 2442 ost->st_size = st->st_size; 2443 ost->st_blocks = st->st_blocks; 2444 ost->st_blksize = st->st_blksize; 2445 ost->st_flags = st->st_flags; 2446 ost->st_gen = st->st_gen; 2447 ost->st_lspare = 0; 2448 ost->st_birthtim = st->st_birthtim; 2449 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2450 sizeof(*ost) - offsetof(struct freebsd11_stat, 2451 st_birthtim) - sizeof(ost->st_birthtim)); 2452 return (0); 2453 } 2454 2455 int 2456 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2457 { 2458 struct stat sb; 2459 struct freebsd11_stat osb; 2460 int error; 2461 2462 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb); 2463 if (error != 0) 2464 return (error); 2465 error = freebsd11_cvtstat(&sb, &osb); 2466 if (error == 0) 2467 error = copyout(&osb, uap->ub, sizeof(osb)); 2468 return (error); 2469 } 2470 2471 int 2472 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2473 { 2474 struct stat sb; 2475 struct freebsd11_stat osb; 2476 int error; 2477 2478 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2479 UIO_USERSPACE, &sb); 2480 if (error != 0) 2481 return (error); 2482 error = freebsd11_cvtstat(&sb, &osb); 2483 if (error == 0) 2484 error = copyout(&osb, uap->ub, sizeof(osb)); 2485 return (error); 2486 } 2487 2488 int 2489 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2490 { 2491 struct fhandle fh; 2492 struct stat sb; 2493 struct freebsd11_stat osb; 2494 int error; 2495 2496 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2497 if (error != 0) 2498 return (error); 2499 error = kern_fhstat(td, fh, &sb); 2500 if (error != 0) 2501 return (error); 2502 error = freebsd11_cvtstat(&sb, &osb); 2503 if (error == 0) 2504 error = copyout(&osb, uap->sb, sizeof(osb)); 2505 return (error); 2506 } 2507 2508 int 2509 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2510 { 2511 struct stat sb; 2512 struct freebsd11_stat osb; 2513 int error; 2514 2515 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2516 UIO_USERSPACE, &sb); 2517 if (error != 0) 2518 return (error); 2519 error = freebsd11_cvtstat(&sb, &osb); 2520 if (error == 0) 2521 error = copyout(&osb, uap->buf, sizeof(osb)); 2522 return (error); 2523 } 2524 #endif /* COMPAT_FREEBSD11 */ 2525 2526 /* 2527 * Get file status 2528 */ 2529 #ifndef _SYS_SYSPROTO_H_ 2530 struct fstatat_args { 2531 int fd; 2532 char *path; 2533 struct stat *buf; 2534 int flag; 2535 } 2536 #endif 2537 int 2538 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2539 { 2540 struct stat sb; 2541 int error; 2542 2543 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2544 UIO_USERSPACE, &sb); 2545 if (error == 0) 2546 error = copyout(&sb, uap->buf, sizeof (sb)); 2547 return (error); 2548 } 2549 2550 int 2551 kern_statat(struct thread *td, int flag, int fd, const char *path, 2552 enum uio_seg pathseg, struct stat *sbp) 2553 { 2554 struct nameidata nd; 2555 int error; 2556 2557 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2558 AT_EMPTY_PATH)) != 0) 2559 return (EINVAL); 2560 2561 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH | 2562 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF | 2563 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights); 2564 2565 if ((error = namei(&nd)) != 0) { 2566 if (error == ENOTDIR && 2567 (nd.ni_resflags & NIRES_EMPTYPATH) != 0) 2568 error = kern_fstat(td, fd, sbp); 2569 return (error); 2570 } 2571 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED); 2572 NDFREE_PNBUF(&nd); 2573 vput(nd.ni_vp); 2574 #ifdef __STAT_TIME_T_EXT 2575 sbp->st_atim_ext = 0; 2576 sbp->st_mtim_ext = 0; 2577 sbp->st_ctim_ext = 0; 2578 sbp->st_btim_ext = 0; 2579 #endif 2580 #ifdef KTRACE 2581 if (KTRPOINT(td, KTR_STRUCT)) 2582 ktrstat_error(sbp, error); 2583 #endif 2584 return (error); 2585 } 2586 2587 #if defined(COMPAT_FREEBSD11) 2588 /* 2589 * Implementation of the NetBSD [l]stat() functions. 2590 */ 2591 int 2592 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2593 { 2594 struct freebsd11_stat sb11; 2595 int error; 2596 2597 error = freebsd11_cvtstat(sb, &sb11); 2598 if (error != 0) 2599 return (error); 2600 2601 bzero(nsb, sizeof(*nsb)); 2602 CP(sb11, *nsb, st_dev); 2603 CP(sb11, *nsb, st_ino); 2604 CP(sb11, *nsb, st_mode); 2605 CP(sb11, *nsb, st_nlink); 2606 CP(sb11, *nsb, st_uid); 2607 CP(sb11, *nsb, st_gid); 2608 CP(sb11, *nsb, st_rdev); 2609 CP(sb11, *nsb, st_atim); 2610 CP(sb11, *nsb, st_mtim); 2611 CP(sb11, *nsb, st_ctim); 2612 CP(sb11, *nsb, st_size); 2613 CP(sb11, *nsb, st_blocks); 2614 CP(sb11, *nsb, st_blksize); 2615 CP(sb11, *nsb, st_flags); 2616 CP(sb11, *nsb, st_gen); 2617 CP(sb11, *nsb, st_birthtim); 2618 return (0); 2619 } 2620 2621 #ifndef _SYS_SYSPROTO_H_ 2622 struct freebsd11_nstat_args { 2623 char *path; 2624 struct nstat *ub; 2625 }; 2626 #endif 2627 int 2628 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2629 { 2630 struct stat sb; 2631 struct nstat nsb; 2632 int error; 2633 2634 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb); 2635 if (error != 0) 2636 return (error); 2637 error = freebsd11_cvtnstat(&sb, &nsb); 2638 if (error == 0) 2639 error = copyout(&nsb, uap->ub, sizeof (nsb)); 2640 return (error); 2641 } 2642 2643 /* 2644 * NetBSD lstat. Get file status; this version does not follow links. 2645 */ 2646 #ifndef _SYS_SYSPROTO_H_ 2647 struct freebsd11_nlstat_args { 2648 char *path; 2649 struct nstat *ub; 2650 }; 2651 #endif 2652 int 2653 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2654 { 2655 struct stat sb; 2656 struct nstat nsb; 2657 int error; 2658 2659 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2660 UIO_USERSPACE, &sb); 2661 if (error != 0) 2662 return (error); 2663 error = freebsd11_cvtnstat(&sb, &nsb); 2664 if (error == 0) 2665 error = copyout(&nsb, uap->ub, sizeof (nsb)); 2666 return (error); 2667 } 2668 #endif /* COMPAT_FREEBSD11 */ 2669 2670 /* 2671 * Get configurable pathname variables. 2672 */ 2673 #ifndef _SYS_SYSPROTO_H_ 2674 struct pathconf_args { 2675 char *path; 2676 int name; 2677 }; 2678 #endif 2679 int 2680 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2681 { 2682 long value; 2683 int error; 2684 2685 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2686 &value); 2687 if (error == 0) 2688 td->td_retval[0] = value; 2689 return (error); 2690 } 2691 2692 #ifndef _SYS_SYSPROTO_H_ 2693 struct lpathconf_args { 2694 char *path; 2695 int name; 2696 }; 2697 #endif 2698 int 2699 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2700 { 2701 long value; 2702 int error; 2703 2704 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2705 NOFOLLOW, &value); 2706 if (error == 0) 2707 td->td_retval[0] = value; 2708 return (error); 2709 } 2710 2711 int 2712 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2713 int name, u_long flags, long *valuep) 2714 { 2715 struct nameidata nd; 2716 int error; 2717 2718 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2719 pathseg, path); 2720 if ((error = namei(&nd)) != 0) 2721 return (error); 2722 NDFREE_PNBUF(&nd); 2723 2724 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2725 vput(nd.ni_vp); 2726 return (error); 2727 } 2728 2729 /* 2730 * Return target name of a symbolic link. 2731 */ 2732 #ifndef _SYS_SYSPROTO_H_ 2733 struct readlink_args { 2734 char *path; 2735 char *buf; 2736 size_t count; 2737 }; 2738 #endif 2739 int 2740 sys_readlink(struct thread *td, struct readlink_args *uap) 2741 { 2742 2743 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2744 uap->buf, UIO_USERSPACE, uap->count)); 2745 } 2746 #ifndef _SYS_SYSPROTO_H_ 2747 struct readlinkat_args { 2748 int fd; 2749 char *path; 2750 char *buf; 2751 size_t bufsize; 2752 }; 2753 #endif 2754 int 2755 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2756 { 2757 2758 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2759 uap->buf, UIO_USERSPACE, uap->bufsize)); 2760 } 2761 2762 int 2763 kern_readlinkat(struct thread *td, int fd, const char *path, 2764 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2765 { 2766 struct vnode *vp; 2767 struct nameidata nd; 2768 int error; 2769 2770 if (count > IOSIZE_MAX) 2771 return (EINVAL); 2772 2773 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | 2774 EMPTYPATH, pathseg, path, fd); 2775 2776 if ((error = namei(&nd)) != 0) 2777 return (error); 2778 NDFREE_PNBUF(&nd); 2779 vp = nd.ni_vp; 2780 2781 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2782 vput(vp); 2783 2784 return (error); 2785 } 2786 2787 /* 2788 * Helper function to readlink from a vnode 2789 */ 2790 static int 2791 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2792 struct thread *td) 2793 { 2794 struct iovec aiov; 2795 struct uio auio; 2796 int error; 2797 2798 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2799 #ifdef MAC 2800 error = mac_vnode_check_readlink(td->td_ucred, vp); 2801 if (error != 0) 2802 return (error); 2803 #endif 2804 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2805 return (EINVAL); 2806 2807 aiov.iov_base = buf; 2808 aiov.iov_len = count; 2809 auio.uio_iov = &aiov; 2810 auio.uio_iovcnt = 1; 2811 auio.uio_offset = 0; 2812 auio.uio_rw = UIO_READ; 2813 auio.uio_segflg = bufseg; 2814 auio.uio_td = td; 2815 auio.uio_resid = count; 2816 error = VOP_READLINK(vp, &auio, td->td_ucred); 2817 td->td_retval[0] = count - auio.uio_resid; 2818 return (error); 2819 } 2820 2821 /* 2822 * Common implementation code for chflags() and fchflags(). 2823 */ 2824 static int 2825 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2826 { 2827 struct mount *mp; 2828 struct vattr vattr; 2829 int error; 2830 2831 /* We can't support the value matching VNOVAL. */ 2832 if (flags == VNOVAL) 2833 return (EOPNOTSUPP); 2834 2835 /* 2836 * Prevent non-root users from setting flags on devices. When 2837 * a device is reused, users can retain ownership of the device 2838 * if they are allowed to set flags and programs assume that 2839 * chown can't fail when done as root. 2840 */ 2841 if (VN_ISDEV(vp)) { 2842 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2843 if (error != 0) 2844 return (error); 2845 } 2846 2847 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2848 return (error); 2849 VATTR_NULL(&vattr); 2850 vattr.va_flags = flags; 2851 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2852 #ifdef MAC 2853 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2854 if (error == 0) 2855 #endif 2856 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2857 VOP_UNLOCK(vp); 2858 vn_finished_write(mp); 2859 return (error); 2860 } 2861 2862 /* 2863 * Change flags of a file given a path name. 2864 */ 2865 #ifndef _SYS_SYSPROTO_H_ 2866 struct chflags_args { 2867 const char *path; 2868 u_long flags; 2869 }; 2870 #endif 2871 int 2872 sys_chflags(struct thread *td, struct chflags_args *uap) 2873 { 2874 2875 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2876 uap->flags, 0)); 2877 } 2878 2879 #ifndef _SYS_SYSPROTO_H_ 2880 struct chflagsat_args { 2881 int fd; 2882 const char *path; 2883 u_long flags; 2884 int atflag; 2885 } 2886 #endif 2887 int 2888 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2889 { 2890 2891 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2892 uap->flags, uap->atflag)); 2893 } 2894 2895 /* 2896 * Same as chflags() but doesn't follow symlinks. 2897 */ 2898 #ifndef _SYS_SYSPROTO_H_ 2899 struct lchflags_args { 2900 const char *path; 2901 u_long flags; 2902 }; 2903 #endif 2904 int 2905 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2906 { 2907 2908 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2909 uap->flags, AT_SYMLINK_NOFOLLOW)); 2910 } 2911 2912 static int 2913 kern_chflagsat(struct thread *td, int fd, const char *path, 2914 enum uio_seg pathseg, u_long flags, int atflag) 2915 { 2916 struct nameidata nd; 2917 int error; 2918 2919 if ((atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2920 AT_EMPTY_PATH)) != 0) 2921 return (EINVAL); 2922 2923 AUDIT_ARG_FFLAGS(flags); 2924 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW | 2925 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2926 fd, &cap_fchflags_rights); 2927 if ((error = namei(&nd)) != 0) 2928 return (error); 2929 NDFREE_PNBUF(&nd); 2930 error = setfflags(td, nd.ni_vp, flags); 2931 vrele(nd.ni_vp); 2932 return (error); 2933 } 2934 2935 /* 2936 * Change flags of a file given a file descriptor. 2937 */ 2938 #ifndef _SYS_SYSPROTO_H_ 2939 struct fchflags_args { 2940 int fd; 2941 u_long flags; 2942 }; 2943 #endif 2944 int 2945 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2946 { 2947 struct file *fp; 2948 int error; 2949 2950 AUDIT_ARG_FD(uap->fd); 2951 AUDIT_ARG_FFLAGS(uap->flags); 2952 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2953 &fp); 2954 if (error != 0) 2955 return (error); 2956 #ifdef AUDIT 2957 if (AUDITING_TD(td)) { 2958 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2959 AUDIT_ARG_VNODE1(fp->f_vnode); 2960 VOP_UNLOCK(fp->f_vnode); 2961 } 2962 #endif 2963 error = setfflags(td, fp->f_vnode, uap->flags); 2964 fdrop(fp, td); 2965 return (error); 2966 } 2967 2968 /* 2969 * Common implementation code for chmod(), lchmod() and fchmod(). 2970 */ 2971 int 2972 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2973 { 2974 struct mount *mp; 2975 struct vattr vattr; 2976 int error; 2977 2978 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2979 return (error); 2980 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2981 VATTR_NULL(&vattr); 2982 vattr.va_mode = mode & ALLPERMS; 2983 #ifdef MAC 2984 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2985 if (error == 0) 2986 #endif 2987 error = VOP_SETATTR(vp, &vattr, cred); 2988 VOP_UNLOCK(vp); 2989 vn_finished_write(mp); 2990 return (error); 2991 } 2992 2993 /* 2994 * Change mode of a file given path name. 2995 */ 2996 #ifndef _SYS_SYSPROTO_H_ 2997 struct chmod_args { 2998 char *path; 2999 int mode; 3000 }; 3001 #endif 3002 int 3003 sys_chmod(struct thread *td, struct chmod_args *uap) 3004 { 3005 3006 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3007 uap->mode, 0)); 3008 } 3009 3010 #ifndef _SYS_SYSPROTO_H_ 3011 struct fchmodat_args { 3012 int dirfd; 3013 char *path; 3014 mode_t mode; 3015 int flag; 3016 } 3017 #endif 3018 int 3019 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 3020 { 3021 3022 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 3023 uap->mode, uap->flag)); 3024 } 3025 3026 /* 3027 * Change mode of a file given path name (don't follow links.) 3028 */ 3029 #ifndef _SYS_SYSPROTO_H_ 3030 struct lchmod_args { 3031 char *path; 3032 int mode; 3033 }; 3034 #endif 3035 int 3036 sys_lchmod(struct thread *td, struct lchmod_args *uap) 3037 { 3038 3039 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3040 uap->mode, AT_SYMLINK_NOFOLLOW)); 3041 } 3042 3043 int 3044 kern_fchmodat(struct thread *td, int fd, const char *path, 3045 enum uio_seg pathseg, mode_t mode, int flag) 3046 { 3047 struct nameidata nd; 3048 int error; 3049 3050 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3051 AT_EMPTY_PATH)) != 0) 3052 return (EINVAL); 3053 3054 AUDIT_ARG_MODE(mode); 3055 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3056 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3057 fd, &cap_fchmod_rights); 3058 if ((error = namei(&nd)) != 0) 3059 return (error); 3060 NDFREE_PNBUF(&nd); 3061 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 3062 vrele(nd.ni_vp); 3063 return (error); 3064 } 3065 3066 /* 3067 * Change mode of a file given a file descriptor. 3068 */ 3069 #ifndef _SYS_SYSPROTO_H_ 3070 struct fchmod_args { 3071 int fd; 3072 int mode; 3073 }; 3074 #endif 3075 int 3076 sys_fchmod(struct thread *td, struct fchmod_args *uap) 3077 { 3078 struct file *fp; 3079 int error; 3080 3081 AUDIT_ARG_FD(uap->fd); 3082 AUDIT_ARG_MODE(uap->mode); 3083 3084 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 3085 if (error != 0) 3086 return (error); 3087 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 3088 fdrop(fp, td); 3089 return (error); 3090 } 3091 3092 /* 3093 * Common implementation for chown(), lchown(), and fchown() 3094 */ 3095 int 3096 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 3097 gid_t gid) 3098 { 3099 struct mount *mp; 3100 struct vattr vattr; 3101 int error; 3102 3103 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3104 return (error); 3105 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3106 VATTR_NULL(&vattr); 3107 vattr.va_uid = uid; 3108 vattr.va_gid = gid; 3109 #ifdef MAC 3110 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 3111 vattr.va_gid); 3112 if (error == 0) 3113 #endif 3114 error = VOP_SETATTR(vp, &vattr, cred); 3115 VOP_UNLOCK(vp); 3116 vn_finished_write(mp); 3117 return (error); 3118 } 3119 3120 /* 3121 * Set ownership given a path name. 3122 */ 3123 #ifndef _SYS_SYSPROTO_H_ 3124 struct chown_args { 3125 char *path; 3126 int uid; 3127 int gid; 3128 }; 3129 #endif 3130 int 3131 sys_chown(struct thread *td, struct chown_args *uap) 3132 { 3133 3134 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 3135 uap->gid, 0)); 3136 } 3137 3138 #ifndef _SYS_SYSPROTO_H_ 3139 struct fchownat_args { 3140 int fd; 3141 const char * path; 3142 uid_t uid; 3143 gid_t gid; 3144 int flag; 3145 }; 3146 #endif 3147 int 3148 sys_fchownat(struct thread *td, struct fchownat_args *uap) 3149 { 3150 3151 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 3152 uap->gid, uap->flag)); 3153 } 3154 3155 int 3156 kern_fchownat(struct thread *td, int fd, const char *path, 3157 enum uio_seg pathseg, int uid, int gid, int flag) 3158 { 3159 struct nameidata nd; 3160 int error; 3161 3162 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3163 AT_EMPTY_PATH)) != 0) 3164 return (EINVAL); 3165 3166 AUDIT_ARG_OWNER(uid, gid); 3167 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3168 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3169 fd, &cap_fchown_rights); 3170 3171 if ((error = namei(&nd)) != 0) 3172 return (error); 3173 NDFREE_PNBUF(&nd); 3174 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 3175 vrele(nd.ni_vp); 3176 return (error); 3177 } 3178 3179 /* 3180 * Set ownership given a path name, do not cross symlinks. 3181 */ 3182 #ifndef _SYS_SYSPROTO_H_ 3183 struct lchown_args { 3184 char *path; 3185 int uid; 3186 int gid; 3187 }; 3188 #endif 3189 int 3190 sys_lchown(struct thread *td, struct lchown_args *uap) 3191 { 3192 3193 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3194 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 3195 } 3196 3197 /* 3198 * Set ownership given a file descriptor. 3199 */ 3200 #ifndef _SYS_SYSPROTO_H_ 3201 struct fchown_args { 3202 int fd; 3203 int uid; 3204 int gid; 3205 }; 3206 #endif 3207 int 3208 sys_fchown(struct thread *td, struct fchown_args *uap) 3209 { 3210 struct file *fp; 3211 int error; 3212 3213 AUDIT_ARG_FD(uap->fd); 3214 AUDIT_ARG_OWNER(uap->uid, uap->gid); 3215 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 3216 if (error != 0) 3217 return (error); 3218 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 3219 fdrop(fp, td); 3220 return (error); 3221 } 3222 3223 /* 3224 * Common implementation code for utimes(), lutimes(), and futimes(). 3225 */ 3226 static int 3227 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 3228 struct timespec *tsp) 3229 { 3230 struct timeval tv[2]; 3231 const struct timeval *tvp; 3232 int error; 3233 3234 if (usrtvp == NULL) { 3235 vfs_timestamp(&tsp[0]); 3236 tsp[1] = tsp[0]; 3237 } else { 3238 if (tvpseg == UIO_SYSSPACE) { 3239 tvp = usrtvp; 3240 } else { 3241 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3242 return (error); 3243 tvp = tv; 3244 } 3245 3246 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3247 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3248 return (EINVAL); 3249 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3250 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3251 } 3252 return (0); 3253 } 3254 3255 /* 3256 * Common implementation code for futimens(), utimensat(). 3257 */ 3258 #define UTIMENS_NULL 0x1 3259 #define UTIMENS_EXIT 0x2 3260 static int 3261 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3262 struct timespec *tsp, int *retflags) 3263 { 3264 struct timespec tsnow; 3265 int error; 3266 3267 vfs_timestamp(&tsnow); 3268 *retflags = 0; 3269 if (usrtsp == NULL) { 3270 tsp[0] = tsnow; 3271 tsp[1] = tsnow; 3272 *retflags |= UTIMENS_NULL; 3273 return (0); 3274 } 3275 if (tspseg == UIO_SYSSPACE) { 3276 tsp[0] = usrtsp[0]; 3277 tsp[1] = usrtsp[1]; 3278 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3279 return (error); 3280 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3281 *retflags |= UTIMENS_EXIT; 3282 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3283 *retflags |= UTIMENS_NULL; 3284 if (tsp[0].tv_nsec == UTIME_OMIT) 3285 tsp[0].tv_sec = VNOVAL; 3286 else if (tsp[0].tv_nsec == UTIME_NOW) 3287 tsp[0] = tsnow; 3288 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3289 return (EINVAL); 3290 if (tsp[1].tv_nsec == UTIME_OMIT) 3291 tsp[1].tv_sec = VNOVAL; 3292 else if (tsp[1].tv_nsec == UTIME_NOW) 3293 tsp[1] = tsnow; 3294 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3295 return (EINVAL); 3296 3297 return (0); 3298 } 3299 3300 /* 3301 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3302 * and utimensat(). 3303 */ 3304 static int 3305 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3306 int numtimes, int nullflag) 3307 { 3308 struct mount *mp; 3309 struct vattr vattr; 3310 int error; 3311 bool setbirthtime; 3312 3313 setbirthtime = false; 3314 vattr.va_birthtime.tv_sec = VNOVAL; 3315 vattr.va_birthtime.tv_nsec = 0; 3316 3317 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3318 return (error); 3319 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3320 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred) == 0 && 3321 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3322 setbirthtime = true; 3323 VATTR_NULL(&vattr); 3324 vattr.va_atime = ts[0]; 3325 vattr.va_mtime = ts[1]; 3326 if (setbirthtime) 3327 vattr.va_birthtime = ts[1]; 3328 if (numtimes > 2) 3329 vattr.va_birthtime = ts[2]; 3330 if (nullflag) 3331 vattr.va_vaflags |= VA_UTIMES_NULL; 3332 #ifdef MAC 3333 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3334 vattr.va_mtime); 3335 #endif 3336 if (error == 0) 3337 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3338 VOP_UNLOCK(vp); 3339 vn_finished_write(mp); 3340 return (error); 3341 } 3342 3343 /* 3344 * Set the access and modification times of a file. 3345 */ 3346 #ifndef _SYS_SYSPROTO_H_ 3347 struct utimes_args { 3348 char *path; 3349 struct timeval *tptr; 3350 }; 3351 #endif 3352 int 3353 sys_utimes(struct thread *td, struct utimes_args *uap) 3354 { 3355 3356 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3357 uap->tptr, UIO_USERSPACE)); 3358 } 3359 3360 #ifndef _SYS_SYSPROTO_H_ 3361 struct futimesat_args { 3362 int fd; 3363 const char * path; 3364 const struct timeval * times; 3365 }; 3366 #endif 3367 int 3368 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3369 { 3370 3371 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3372 uap->times, UIO_USERSPACE)); 3373 } 3374 3375 int 3376 kern_utimesat(struct thread *td, int fd, const char *path, 3377 enum uio_seg pathseg, const struct timeval *tptr, enum uio_seg tptrseg) 3378 { 3379 struct nameidata nd; 3380 struct timespec ts[2]; 3381 int error; 3382 3383 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3384 return (error); 3385 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3386 &cap_futimes_rights); 3387 3388 if ((error = namei(&nd)) != 0) 3389 return (error); 3390 NDFREE_PNBUF(&nd); 3391 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3392 vrele(nd.ni_vp); 3393 return (error); 3394 } 3395 3396 /* 3397 * Set the access and modification times of a file. 3398 */ 3399 #ifndef _SYS_SYSPROTO_H_ 3400 struct lutimes_args { 3401 char *path; 3402 struct timeval *tptr; 3403 }; 3404 #endif 3405 int 3406 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3407 { 3408 3409 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3410 UIO_USERSPACE)); 3411 } 3412 3413 int 3414 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3415 const struct timeval *tptr, enum uio_seg tptrseg) 3416 { 3417 struct timespec ts[2]; 3418 struct nameidata nd; 3419 int error; 3420 3421 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3422 return (error); 3423 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path); 3424 if ((error = namei(&nd)) != 0) 3425 return (error); 3426 NDFREE_PNBUF(&nd); 3427 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3428 vrele(nd.ni_vp); 3429 return (error); 3430 } 3431 3432 /* 3433 * Set the access and modification times of a file. 3434 */ 3435 #ifndef _SYS_SYSPROTO_H_ 3436 struct futimes_args { 3437 int fd; 3438 struct timeval *tptr; 3439 }; 3440 #endif 3441 int 3442 sys_futimes(struct thread *td, struct futimes_args *uap) 3443 { 3444 3445 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3446 } 3447 3448 int 3449 kern_futimes(struct thread *td, int fd, const struct timeval *tptr, 3450 enum uio_seg tptrseg) 3451 { 3452 struct timespec ts[2]; 3453 struct file *fp; 3454 int error; 3455 3456 AUDIT_ARG_FD(fd); 3457 error = getutimes(tptr, tptrseg, ts); 3458 if (error != 0) 3459 return (error); 3460 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3461 if (error != 0) 3462 return (error); 3463 #ifdef AUDIT 3464 if (AUDITING_TD(td)) { 3465 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3466 AUDIT_ARG_VNODE1(fp->f_vnode); 3467 VOP_UNLOCK(fp->f_vnode); 3468 } 3469 #endif 3470 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3471 fdrop(fp, td); 3472 return (error); 3473 } 3474 3475 int 3476 sys_futimens(struct thread *td, struct futimens_args *uap) 3477 { 3478 3479 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3480 } 3481 3482 int 3483 kern_futimens(struct thread *td, int fd, const struct timespec *tptr, 3484 enum uio_seg tptrseg) 3485 { 3486 struct timespec ts[2]; 3487 struct file *fp; 3488 int error, flags; 3489 3490 AUDIT_ARG_FD(fd); 3491 error = getutimens(tptr, tptrseg, ts, &flags); 3492 if (error != 0) 3493 return (error); 3494 if (flags & UTIMENS_EXIT) 3495 return (0); 3496 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3497 if (error != 0) 3498 return (error); 3499 #ifdef AUDIT 3500 if (AUDITING_TD(td)) { 3501 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3502 AUDIT_ARG_VNODE1(fp->f_vnode); 3503 VOP_UNLOCK(fp->f_vnode); 3504 } 3505 #endif 3506 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3507 fdrop(fp, td); 3508 return (error); 3509 } 3510 3511 int 3512 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3513 { 3514 3515 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3516 uap->times, UIO_USERSPACE, uap->flag)); 3517 } 3518 3519 int 3520 kern_utimensat(struct thread *td, int fd, const char *path, 3521 enum uio_seg pathseg, const struct timespec *tptr, enum uio_seg tptrseg, 3522 int flag) 3523 { 3524 struct nameidata nd; 3525 struct timespec ts[2]; 3526 int error, flags; 3527 3528 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3529 AT_EMPTY_PATH)) != 0) 3530 return (EINVAL); 3531 3532 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3533 return (error); 3534 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3535 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, 3536 pathseg, path, fd, &cap_futimes_rights); 3537 if ((error = namei(&nd)) != 0) 3538 return (error); 3539 /* 3540 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3541 * POSIX states: 3542 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3543 * "Search permission is denied by a component of the path prefix." 3544 */ 3545 NDFREE_PNBUF(&nd); 3546 if ((flags & UTIMENS_EXIT) == 0) 3547 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3548 vrele(nd.ni_vp); 3549 return (error); 3550 } 3551 3552 /* 3553 * Truncate a file given its path name. 3554 */ 3555 #ifndef _SYS_SYSPROTO_H_ 3556 struct truncate_args { 3557 char *path; 3558 int pad; 3559 off_t length; 3560 }; 3561 #endif 3562 int 3563 sys_truncate(struct thread *td, struct truncate_args *uap) 3564 { 3565 3566 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3567 } 3568 3569 int 3570 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3571 off_t length) 3572 { 3573 struct mount *mp; 3574 struct vnode *vp; 3575 void *rl_cookie; 3576 struct nameidata nd; 3577 int error; 3578 3579 if (length < 0) 3580 return (EINVAL); 3581 NDPREINIT(&nd); 3582 retry: 3583 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path); 3584 if ((error = namei(&nd)) != 0) 3585 return (error); 3586 vp = nd.ni_vp; 3587 NDFREE_PNBUF(&nd); 3588 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3589 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3590 vn_rangelock_unlock(vp, rl_cookie); 3591 vrele(vp); 3592 return (error); 3593 } 3594 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3595 if (vp->v_type == VDIR) { 3596 error = EISDIR; 3597 goto out; 3598 } 3599 #ifdef MAC 3600 error = mac_vnode_check_write(td->td_ucred, NOCRED, vp); 3601 if (error != 0) 3602 goto out; 3603 #endif 3604 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td); 3605 if (error != 0) 3606 goto out; 3607 3608 error = vn_truncate_locked(vp, length, false, td->td_ucred); 3609 out: 3610 VOP_UNLOCK(vp); 3611 vn_finished_write(mp); 3612 vn_rangelock_unlock(vp, rl_cookie); 3613 vrele(vp); 3614 if (error == ERELOOKUP) 3615 goto retry; 3616 return (error); 3617 } 3618 3619 #if defined(COMPAT_43) 3620 /* 3621 * Truncate a file given its path name. 3622 */ 3623 #ifndef _SYS_SYSPROTO_H_ 3624 struct otruncate_args { 3625 char *path; 3626 long length; 3627 }; 3628 #endif 3629 int 3630 otruncate(struct thread *td, struct otruncate_args *uap) 3631 { 3632 3633 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3634 } 3635 #endif /* COMPAT_43 */ 3636 3637 #if defined(COMPAT_FREEBSD6) 3638 /* Versions with the pad argument */ 3639 int 3640 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3641 { 3642 3643 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3644 } 3645 3646 int 3647 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3648 { 3649 3650 return (kern_ftruncate(td, uap->fd, uap->length)); 3651 } 3652 #endif 3653 3654 int 3655 kern_fsync(struct thread *td, int fd, bool fullsync) 3656 { 3657 struct vnode *vp; 3658 struct mount *mp; 3659 struct file *fp; 3660 int error; 3661 3662 AUDIT_ARG_FD(fd); 3663 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3664 if (error != 0) 3665 return (error); 3666 vp = fp->f_vnode; 3667 #if 0 3668 if (!fullsync) 3669 /* XXXKIB: compete outstanding aio writes */; 3670 #endif 3671 retry: 3672 error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH); 3673 if (error != 0) 3674 goto drop; 3675 vn_lock(vp, vn_lktype_write(mp, vp) | LK_RETRY); 3676 AUDIT_ARG_VNODE1(vp); 3677 vnode_pager_clean_async(vp); 3678 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3679 VOP_UNLOCK(vp); 3680 vn_finished_write(mp); 3681 if (error == ERELOOKUP) 3682 goto retry; 3683 drop: 3684 fdrop(fp, td); 3685 return (error); 3686 } 3687 3688 /* 3689 * Sync an open file. 3690 */ 3691 #ifndef _SYS_SYSPROTO_H_ 3692 struct fsync_args { 3693 int fd; 3694 }; 3695 #endif 3696 int 3697 sys_fsync(struct thread *td, struct fsync_args *uap) 3698 { 3699 3700 return (kern_fsync(td, uap->fd, true)); 3701 } 3702 3703 int 3704 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3705 { 3706 3707 return (kern_fsync(td, uap->fd, false)); 3708 } 3709 3710 /* 3711 * Rename files. Source and destination must either both be directories, or 3712 * both not be directories. If target is a directory, it must be empty. 3713 */ 3714 #ifndef _SYS_SYSPROTO_H_ 3715 struct rename_args { 3716 char *from; 3717 char *to; 3718 }; 3719 #endif 3720 int 3721 sys_rename(struct thread *td, struct rename_args *uap) 3722 { 3723 3724 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3725 uap->to, UIO_USERSPACE, 0)); 3726 } 3727 3728 #ifndef _SYS_SYSPROTO_H_ 3729 struct renameat_args { 3730 int oldfd; 3731 char *old; 3732 int newfd; 3733 char *new; 3734 }; 3735 #endif 3736 int 3737 sys_renameat(struct thread *td, struct renameat_args *uap) 3738 { 3739 3740 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3741 UIO_USERSPACE, 0)); 3742 } 3743 3744 int 3745 sys_renameat2(struct thread *td, struct renameat2_args *uap) 3746 { 3747 3748 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3749 UIO_USERSPACE, uap->flags)); 3750 } 3751 3752 #ifdef MAC 3753 static int 3754 kern_renameat_mac(struct thread *td, int fromfd, const char *from, int tofd, 3755 const char *to, enum uio_seg pathseg, struct nameidata *fromnd, int op, 3756 int ndflags) 3757 { 3758 int error; 3759 3760 NDINIT_ATRIGHTS(fromnd, op, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3761 ndflags, pathseg, from, fromfd, &cap_renameat_source_rights); 3762 if ((error = namei(fromnd)) != 0) 3763 return (error); 3764 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp, 3765 fromnd->ni_vp, &fromnd->ni_cnd); 3766 VOP_UNLOCK(fromnd->ni_dvp); 3767 if (fromnd->ni_dvp != fromnd->ni_vp) 3768 VOP_UNLOCK(fromnd->ni_vp); 3769 if (error != 0) { 3770 NDFREE_PNBUF(fromnd); 3771 vrele(fromnd->ni_dvp); 3772 vrele(fromnd->ni_vp); 3773 } 3774 return (error); 3775 } 3776 #endif 3777 3778 int 3779 kern_renameat(struct thread *td, int fromfd, const char *from, int tofd, 3780 const char *to, enum uio_seg pathseg, u_int flags) 3781 { 3782 struct mount *mp, *tmp; 3783 struct vnode *tvp, *fvp, *tdvp; 3784 struct nameidata fromnd, tond; 3785 uint64_t tondflags; 3786 int error, fndflags, op; 3787 short irflag; 3788 bool exchange; 3789 3790 if ((flags & ~(AT_RENAME_NOREPLACE | AT_RENAME_EXCHANGE)) != 0) 3791 return (EINVAL); 3792 if ((flags & (AT_RENAME_NOREPLACE | AT_RENAME_EXCHANGE)) == 3793 (AT_RENAME_NOREPLACE | AT_RENAME_EXCHANGE)) 3794 return (EINVAL); 3795 if ((flags & AT_RENAME_EXCHANGE) != 0) { 3796 op = RENAME; 3797 exchange = true; 3798 } else { 3799 op = DELETE; 3800 exchange = false; 3801 } 3802 fndflags = 0; 3803 again: 3804 tmp = mp = NULL; 3805 bwillwrite(); 3806 #ifdef MAC 3807 if (mac_vnode_check_rename_from_enabled()) { 3808 error = kern_renameat_mac(td, fromfd, from, tofd, to, pathseg, 3809 &fromnd, op, fndflags); 3810 if (error != 0) 3811 return (error); 3812 } else { 3813 #endif 3814 NDINIT_ATRIGHTS(&fromnd, op, WANTPARENT | AUDITVNODE1 | fndflags, 3815 pathseg, from, fromfd, &cap_renameat_source_rights); 3816 if ((error = namei(&fromnd)) != 0) 3817 return (error); 3818 #ifdef MAC 3819 } 3820 #endif 3821 fvp = fromnd.ni_vp; 3822 if (fromnd.ni_dvp->v_type != VDIR) { 3823 NDFREE_PNBUF(&fromnd); 3824 vrele(fromnd.ni_dvp); 3825 if (fvp != NULL) 3826 vrele(fromnd.ni_vp); 3827 return (EBUSY); 3828 } 3829 if (exchange && fvp == NULL) { 3830 NDFREE_PNBUF(&fromnd); 3831 vrele(fromnd.ni_dvp); 3832 return (ENOENT); 3833 } 3834 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | AUDITVNODE2; 3835 if (fromnd.ni_vp->v_type == VDIR) 3836 tondflags |= WILLBEDIR; 3837 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, to, tofd, 3838 &cap_renameat_target_rights); 3839 if ((error = namei(&tond)) != 0) { 3840 /* Translate error code for rename("dir1", "dir2/."). */ 3841 if (error == EISDIR && fvp->v_type == VDIR) 3842 error = EINVAL; 3843 NDFREE_PNBUF(&fromnd); 3844 vrele(fromnd.ni_dvp); 3845 vrele(fvp); 3846 goto out1; 3847 } 3848 tdvp = tond.ni_dvp; 3849 tvp = tond.ni_vp; 3850 if (tdvp->v_type != VDIR) { 3851 /* 3852 * Rename of the root vnode of the mounted 3853 * filesystem. It is possible to get there with the 3854 * nullfs mount over the regular file. 3855 */ 3856 error = EBUSY; 3857 goto out; 3858 } 3859 if (tvp != NULL && (flags & AT_RENAME_NOREPLACE) != 0) { 3860 /* 3861 * Often filesystems need to relock the vnodes in 3862 * VOP_RENAME(), which opens a window for invalidation 3863 * of this check. Then, not all filesystems might 3864 * implement AT_RENAME_NOREPLACE. This leads to 3865 * situation where sometimes EOPNOTSUPP might be 3866 * returned from the VOP due to race, while most of 3867 * the time this check works. 3868 */ 3869 error = EEXIST; 3870 goto out; 3871 } 3872 if (exchange) { 3873 if (tvp == NULL) { 3874 error = ENOENT; 3875 goto out; 3876 } 3877 if (tvp->v_type == VDIR && fndflags == 0) { 3878 fndflags = WILLBEDIR; 3879 again2: 3880 NDFREE_PNBUF(&fromnd); 3881 vrele(fromnd.ni_dvp); 3882 vrele(fvp); 3883 NDFREE_PNBUF(&tond); 3884 VOP_VPUT_PAIR(tdvp, &tvp, true); 3885 error = sig_intr(); 3886 if (error != 0) 3887 goto out1; 3888 goto again; 3889 } 3890 if (tvp->v_type != VDIR && fndflags != 0) { 3891 fndflags = 0; 3892 goto again2; 3893 } 3894 } 3895 error = vn_start_write(fvp, &mp, V_NOWAIT); 3896 if (error != 0) { 3897 again1: 3898 NDFREE_PNBUF(&fromnd); 3899 NDFREE_PNBUF(&tond); 3900 if (tvp != NULL) 3901 vput(tvp); 3902 if (tdvp == tvp) 3903 vrele(tdvp); 3904 else 3905 vput(tdvp); 3906 vrele(fromnd.ni_dvp); 3907 vrele(fvp); 3908 if (tmp != NULL) { 3909 lockmgr(&tmp->mnt_renamelock, LK_EXCLUSIVE, NULL); 3910 lockmgr(&tmp->mnt_renamelock, LK_RELEASE, NULL); 3911 vfs_rel(tmp); 3912 tmp = NULL; 3913 } 3914 error = sig_intr(); 3915 if (error != 0) 3916 return (error); 3917 error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH); 3918 if (error != 0) 3919 return (error); 3920 goto again; 3921 } 3922 error = VOP_GETWRITEMOUNT(tdvp, &tmp); 3923 if (error != 0 || tmp == NULL) 3924 goto again1; 3925 error = lockmgr(&tmp->mnt_renamelock, LK_EXCLUSIVE | LK_NOWAIT, NULL); 3926 if (error != 0) { 3927 vn_finished_write(mp); 3928 goto again1; 3929 } 3930 irflag = vn_irflag_read(fvp); 3931 if (((irflag & VIRF_NAMEDATTR) != 0 && tdvp != fromnd.ni_dvp) || 3932 (irflag & VIRF_NAMEDDIR) != 0) { 3933 error = EINVAL; 3934 goto out; 3935 } 3936 if (tvp != NULL) { 3937 if (!exchange) { 3938 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3939 error = ENOTDIR; 3940 goto out; 3941 } else if (fvp->v_type != VDIR && 3942 tvp->v_type == VDIR) { 3943 error = EISDIR; 3944 goto out; 3945 } 3946 } 3947 #ifdef CAPABILITIES 3948 if (tofd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3949 /* 3950 * If the target already exists we require CAP_UNLINKAT 3951 * from 'tofd', when tofd was used for the lookup. 3952 */ 3953 error = cap_check(&tond.ni_filecaps.fc_rights, 3954 &cap_unlinkat_rights); 3955 if (error != 0) 3956 goto out; 3957 } 3958 #endif 3959 } 3960 if (fvp == tdvp) { 3961 error = EINVAL; 3962 goto out; 3963 } 3964 /* 3965 * If the source is the same as the destination (that is, if they 3966 * are links to the same vnode), then there is nothing to do. 3967 */ 3968 if (fvp == tvp) 3969 error = ERESTART; 3970 #ifdef MAC 3971 else 3972 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3973 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3974 #endif 3975 out: 3976 if (error == 0) { 3977 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3978 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd, flags); 3979 NDFREE_PNBUF(&fromnd); 3980 NDFREE_PNBUF(&tond); 3981 } else { 3982 NDFREE_PNBUF(&fromnd); 3983 NDFREE_PNBUF(&tond); 3984 if (tvp != NULL) 3985 vput(tvp); 3986 if (tdvp == tvp) 3987 vrele(tdvp); 3988 else 3989 vput(tdvp); 3990 vrele(fromnd.ni_dvp); 3991 vrele(fvp); 3992 } 3993 if (tmp != NULL) { 3994 lockmgr(&tmp->mnt_renamelock, LK_RELEASE, 0); 3995 vfs_rel(tmp); 3996 } 3997 if (mp != NULL) 3998 vn_finished_write(mp); 3999 out1: 4000 if (error == ERESTART) 4001 return (0); 4002 if (error == ERELOOKUP) { 4003 error = sig_intr(); 4004 if (error == 0) 4005 goto again; 4006 } 4007 return (error); 4008 } 4009 4010 /* 4011 * Make a directory file. 4012 */ 4013 #ifndef _SYS_SYSPROTO_H_ 4014 struct mkdir_args { 4015 char *path; 4016 int mode; 4017 }; 4018 #endif 4019 int 4020 sys_mkdir(struct thread *td, struct mkdir_args *uap) 4021 { 4022 4023 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 4024 uap->mode)); 4025 } 4026 4027 #ifndef _SYS_SYSPROTO_H_ 4028 struct mkdirat_args { 4029 int fd; 4030 char *path; 4031 mode_t mode; 4032 }; 4033 #endif 4034 int 4035 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 4036 { 4037 4038 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 4039 } 4040 4041 int 4042 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 4043 int mode) 4044 { 4045 struct mount *mp; 4046 struct vattr vattr; 4047 struct nameidata nd; 4048 int error; 4049 4050 AUDIT_ARG_MODE(mode); 4051 NDPREINIT(&nd); 4052 restart: 4053 bwillwrite(); 4054 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | 4055 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR, 4056 segflg, path, fd, &cap_mkdirat_rights); 4057 if ((error = namei(&nd)) != 0) 4058 return (error); 4059 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 4060 NDFREE_PNBUF(&nd); 4061 vput(nd.ni_dvp); 4062 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 4063 return (error); 4064 goto restart; 4065 } 4066 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 4067 error = EINVAL; 4068 goto out; 4069 } 4070 VATTR_NULL(&vattr); 4071 vattr.va_type = VDIR; 4072 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask; 4073 #ifdef MAC 4074 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 4075 &vattr); 4076 if (error != 0) 4077 goto out; 4078 #endif 4079 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 4080 out: 4081 NDFREE_PNBUF(&nd); 4082 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 4083 vn_finished_write(mp); 4084 if (error == ERELOOKUP) 4085 goto restart; 4086 return (error); 4087 } 4088 4089 /* 4090 * Remove a directory file. 4091 */ 4092 #ifndef _SYS_SYSPROTO_H_ 4093 struct rmdir_args { 4094 char *path; 4095 }; 4096 #endif 4097 int 4098 sys_rmdir(struct thread *td, struct rmdir_args *uap) 4099 { 4100 4101 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 4102 0)); 4103 } 4104 4105 int 4106 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 4107 enum uio_seg pathseg, int flag) 4108 { 4109 struct mount *mp; 4110 struct vnode *vp; 4111 struct file *fp; 4112 struct nameidata nd; 4113 cap_rights_t rights; 4114 int error; 4115 4116 fp = NULL; 4117 if (fd != FD_NONE) { 4118 error = getvnode(td, fd, cap_rights_init_one(&rights, 4119 CAP_LOOKUP), &fp); 4120 if (error != 0) 4121 return (error); 4122 } 4123 4124 NDPREINIT(&nd); 4125 restart: 4126 bwillwrite(); 4127 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 4128 at2cnpflags(flag, AT_RESOLVE_BENEATH), 4129 pathseg, path, dfd, &cap_unlinkat_rights); 4130 if ((error = namei(&nd)) != 0) 4131 goto fdout; 4132 vp = nd.ni_vp; 4133 if (vp->v_type != VDIR) { 4134 error = ENOTDIR; 4135 goto out; 4136 } 4137 /* 4138 * No rmdir "." please. 4139 */ 4140 if (nd.ni_dvp == vp) { 4141 error = EINVAL; 4142 goto out; 4143 } 4144 /* 4145 * The root of a mounted filesystem cannot be deleted. 4146 */ 4147 if (vp->v_vflag & VV_ROOT) { 4148 error = EBUSY; 4149 goto out; 4150 } 4151 4152 if (fp != NULL && fp->f_vnode != vp) { 4153 if (VN_IS_DOOMED(fp->f_vnode)) 4154 error = EBADF; 4155 else 4156 error = EDEADLK; 4157 goto out; 4158 } 4159 4160 #ifdef MAC 4161 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 4162 &nd.ni_cnd); 4163 if (error != 0) 4164 goto out; 4165 #endif 4166 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 4167 NDFREE_PNBUF(&nd); 4168 vput(vp); 4169 if (nd.ni_dvp == vp) 4170 vrele(nd.ni_dvp); 4171 else 4172 vput(nd.ni_dvp); 4173 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 4174 goto fdout; 4175 goto restart; 4176 } 4177 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 4178 vn_finished_write(mp); 4179 out: 4180 NDFREE_PNBUF(&nd); 4181 vput(vp); 4182 if (nd.ni_dvp == vp) 4183 vrele(nd.ni_dvp); 4184 else 4185 vput(nd.ni_dvp); 4186 if (error == ERELOOKUP) 4187 goto restart; 4188 fdout: 4189 if (fp != NULL) 4190 fdrop(fp, td); 4191 return (error); 4192 } 4193 4194 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 4195 int 4196 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 4197 long *basep, void (*func)(struct freebsd11_dirent *)) 4198 { 4199 struct freebsd11_dirent dstdp; 4200 struct dirent *dp, *edp; 4201 char *dirbuf; 4202 off_t base; 4203 ssize_t resid, ucount; 4204 int error; 4205 4206 /* XXX arbitrary sanity limit on `count'. */ 4207 count = min(count, 64 * 1024); 4208 4209 dirbuf = malloc(count, M_TEMP, M_WAITOK); 4210 4211 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 4212 UIO_SYSSPACE); 4213 if (error != 0) 4214 goto done; 4215 if (basep != NULL) 4216 *basep = base; 4217 4218 ucount = 0; 4219 for (dp = (struct dirent *)dirbuf, 4220 edp = (struct dirent *)&dirbuf[count - resid]; 4221 ucount < count && dp < edp; ) { 4222 if (dp->d_reclen == 0) 4223 break; 4224 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 4225 if (dp->d_namlen >= sizeof(dstdp.d_name)) 4226 continue; 4227 dstdp.d_type = dp->d_type; 4228 dstdp.d_namlen = dp->d_namlen; 4229 dstdp.d_fileno = dp->d_fileno; /* truncate */ 4230 if (dstdp.d_fileno != dp->d_fileno) { 4231 switch (ino64_trunc_error) { 4232 default: 4233 case 0: 4234 break; 4235 case 1: 4236 error = EOVERFLOW; 4237 goto done; 4238 case 2: 4239 dstdp.d_fileno = UINT32_MAX; 4240 break; 4241 } 4242 } 4243 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 4244 ((dp->d_namlen + 1 + 3) &~ 3); 4245 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 4246 bzero(dstdp.d_name + dstdp.d_namlen, 4247 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 4248 dstdp.d_namlen); 4249 MPASS(dstdp.d_reclen <= dp->d_reclen); 4250 MPASS(ucount + dstdp.d_reclen <= count); 4251 if (func != NULL) 4252 func(&dstdp); 4253 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 4254 if (error != 0) 4255 break; 4256 dp = (struct dirent *)((char *)dp + dp->d_reclen); 4257 ucount += dstdp.d_reclen; 4258 } 4259 4260 done: 4261 free(dirbuf, M_TEMP); 4262 if (error == 0) 4263 td->td_retval[0] = ucount; 4264 return (error); 4265 } 4266 #endif /* COMPAT */ 4267 4268 #ifdef COMPAT_43 4269 static void 4270 ogetdirentries_cvt(struct freebsd11_dirent *dp) 4271 { 4272 #if (BYTE_ORDER == LITTLE_ENDIAN) 4273 /* 4274 * The expected low byte of dp->d_namlen is our dp->d_type. 4275 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 4276 */ 4277 dp->d_type = dp->d_namlen; 4278 dp->d_namlen = 0; 4279 #else 4280 /* 4281 * The dp->d_type is the high byte of the expected dp->d_namlen, 4282 * so must be zero'ed. 4283 */ 4284 dp->d_type = 0; 4285 #endif 4286 } 4287 4288 /* 4289 * Read a block of directory entries in a filesystem independent format. 4290 */ 4291 #ifndef _SYS_SYSPROTO_H_ 4292 struct ogetdirentries_args { 4293 int fd; 4294 char *buf; 4295 u_int count; 4296 long *basep; 4297 }; 4298 #endif 4299 int 4300 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 4301 { 4302 long loff; 4303 int error; 4304 4305 error = kern_ogetdirentries(td, uap, &loff); 4306 if (error == 0) 4307 error = copyout(&loff, uap->basep, sizeof(long)); 4308 return (error); 4309 } 4310 4311 int 4312 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 4313 long *ploff) 4314 { 4315 long base; 4316 int error; 4317 4318 /* XXX arbitrary sanity limit on `count'. */ 4319 if (uap->count > 64 * 1024) 4320 return (EINVAL); 4321 4322 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4323 &base, ogetdirentries_cvt); 4324 4325 if (error == 0 && uap->basep != NULL) 4326 error = copyout(&base, uap->basep, sizeof(long)); 4327 4328 return (error); 4329 } 4330 #endif /* COMPAT_43 */ 4331 4332 #if defined(COMPAT_FREEBSD11) 4333 #ifndef _SYS_SYSPROTO_H_ 4334 struct freebsd11_getdirentries_args { 4335 int fd; 4336 char *buf; 4337 u_int count; 4338 long *basep; 4339 }; 4340 #endif 4341 int 4342 freebsd11_getdirentries(struct thread *td, 4343 struct freebsd11_getdirentries_args *uap) 4344 { 4345 long base; 4346 int error; 4347 4348 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4349 &base, NULL); 4350 4351 if (error == 0 && uap->basep != NULL) 4352 error = copyout(&base, uap->basep, sizeof(long)); 4353 return (error); 4354 } 4355 4356 int 4357 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 4358 { 4359 struct freebsd11_getdirentries_args ap; 4360 4361 ap.fd = uap->fd; 4362 ap.buf = uap->buf; 4363 ap.count = uap->count; 4364 ap.basep = NULL; 4365 return (freebsd11_getdirentries(td, &ap)); 4366 } 4367 #endif /* COMPAT_FREEBSD11 */ 4368 4369 /* 4370 * Read a block of directory entries in a filesystem independent format. 4371 */ 4372 int 4373 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4374 { 4375 off_t base; 4376 int error; 4377 4378 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4379 NULL, UIO_USERSPACE); 4380 if (error != 0) 4381 return (error); 4382 if (uap->basep != NULL) 4383 error = copyout(&base, uap->basep, sizeof(off_t)); 4384 return (error); 4385 } 4386 4387 int 4388 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4389 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4390 { 4391 struct vnode *vp; 4392 struct file *fp; 4393 struct uio auio; 4394 struct iovec aiov; 4395 off_t loff; 4396 int error, eofflag; 4397 off_t foffset; 4398 4399 AUDIT_ARG_FD(fd); 4400 if (count > IOSIZE_MAX) 4401 return (EINVAL); 4402 auio.uio_resid = count; 4403 error = getvnode(td, fd, &cap_read_rights, &fp); 4404 if (error != 0) 4405 return (error); 4406 if ((fp->f_flag & FREAD) == 0) { 4407 fdrop(fp, td); 4408 return (EBADF); 4409 } 4410 vp = fp->f_vnode; 4411 foffset = foffset_lock(fp, 0); 4412 unionread: 4413 if (__predict_false((vp->v_vflag & VV_UNLINKED) != 0)) { 4414 error = ENOENT; 4415 goto fail; 4416 } 4417 aiov.iov_base = buf; 4418 aiov.iov_len = count; 4419 auio.uio_iov = &aiov; 4420 auio.uio_iovcnt = 1; 4421 auio.uio_rw = UIO_READ; 4422 auio.uio_segflg = bufseg; 4423 auio.uio_td = td; 4424 vn_lock(vp, LK_SHARED | LK_RETRY); 4425 /* 4426 * We want to return ENOTDIR for anything that is not VDIR, but 4427 * not for VBAD, and we can't check for VBAD while the vnode is 4428 * unlocked. 4429 */ 4430 if (vp->v_type != VDIR) { 4431 if (vp->v_type == VBAD) 4432 error = EBADF; 4433 else 4434 error = ENOTDIR; 4435 VOP_UNLOCK(vp); 4436 goto fail; 4437 } 4438 AUDIT_ARG_VNODE1(vp); 4439 loff = auio.uio_offset = foffset; 4440 #ifdef MAC 4441 error = mac_vnode_check_readdir(td->td_ucred, vp); 4442 if (error == 0) 4443 #endif 4444 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4445 NULL); 4446 foffset = auio.uio_offset; 4447 if (error != 0) { 4448 VOP_UNLOCK(vp); 4449 goto fail; 4450 } 4451 if (count == auio.uio_resid && 4452 (vp->v_vflag & VV_ROOT) && 4453 (vp->v_mount->mnt_flag & MNT_UNION)) { 4454 struct vnode *tvp = vp; 4455 4456 vp = vp->v_mount->mnt_vnodecovered; 4457 vref(vp); 4458 fp->f_vnode = vp; 4459 foffset = 0; 4460 vput(tvp); 4461 goto unionread; 4462 } 4463 VOP_UNLOCK(vp); 4464 *basep = loff; 4465 if (residp != NULL) 4466 *residp = auio.uio_resid; 4467 td->td_retval[0] = count - auio.uio_resid; 4468 fail: 4469 foffset_unlock(fp, foffset, 0); 4470 fdrop(fp, td); 4471 return (error); 4472 } 4473 4474 /* 4475 * Set the mode mask for creation of filesystem nodes. 4476 */ 4477 #ifndef _SYS_SYSPROTO_H_ 4478 struct umask_args { 4479 int newmask; 4480 }; 4481 #endif 4482 int 4483 sys_umask(struct thread *td, struct umask_args *uap) 4484 { 4485 struct pwddesc *pdp; 4486 4487 pdp = td->td_proc->p_pd; 4488 PWDDESC_XLOCK(pdp); 4489 td->td_retval[0] = pdp->pd_cmask; 4490 pdp->pd_cmask = uap->newmask & ALLPERMS; 4491 PWDDESC_XUNLOCK(pdp); 4492 return (0); 4493 } 4494 4495 /* 4496 * Void all references to file by ripping underlying filesystem away from 4497 * vnode. 4498 */ 4499 #ifndef _SYS_SYSPROTO_H_ 4500 struct revoke_args { 4501 char *path; 4502 }; 4503 #endif 4504 int 4505 sys_revoke(struct thread *td, struct revoke_args *uap) 4506 { 4507 struct vnode *vp; 4508 struct vattr vattr; 4509 struct nameidata nd; 4510 int error; 4511 4512 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4513 uap->path); 4514 if ((error = namei(&nd)) != 0) 4515 return (error); 4516 vp = nd.ni_vp; 4517 NDFREE_PNBUF(&nd); 4518 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4519 error = EINVAL; 4520 goto out; 4521 } 4522 #ifdef MAC 4523 error = mac_vnode_check_revoke(td->td_ucred, vp); 4524 if (error != 0) 4525 goto out; 4526 #endif 4527 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4528 if (error != 0) 4529 goto out; 4530 if (td->td_ucred->cr_uid != vattr.va_uid) { 4531 error = priv_check(td, PRIV_VFS_ADMIN); 4532 if (error != 0) 4533 goto out; 4534 } 4535 if (devfs_usecount(vp) > 0) 4536 VOP_REVOKE(vp, REVOKEALL); 4537 out: 4538 vput(vp); 4539 return (error); 4540 } 4541 4542 /* 4543 * This variant of getvnode() allows O_PATH files. Caller should 4544 * ensure that returned file and vnode are only used for compatible 4545 * semantics. 4546 */ 4547 int 4548 getvnode_path(struct thread *td, int fd, const cap_rights_t *rightsp, 4549 uint8_t *flagsp, struct file **fpp) 4550 { 4551 struct file *fp; 4552 int error; 4553 4554 error = fget_unlocked_flags(td, fd, rightsp, flagsp, &fp); 4555 if (error != 0) 4556 return (error); 4557 4558 /* 4559 * The file could be not of the vnode type, or it may be not 4560 * yet fully initialized, in which case the f_vnode pointer 4561 * may be set, but f_ops is still badfileops. E.g., 4562 * devfs_open() transiently create such situation to 4563 * facilitate csw d_fdopen(). 4564 * 4565 * Dupfdopen() handling in kern_openat() installs the 4566 * half-baked file into the process descriptor table, allowing 4567 * other thread to dereference it. Guard against the race by 4568 * checking f_ops. 4569 */ 4570 if (__predict_false(fp->f_vnode == NULL || fp->f_ops == &badfileops)) { 4571 fdrop(fp, td); 4572 *fpp = NULL; 4573 return (EINVAL); 4574 } 4575 4576 *fpp = fp; 4577 return (0); 4578 } 4579 4580 /* 4581 * Convert a user file descriptor to a kernel file entry and check 4582 * that, if it is a capability, the correct rights are present. 4583 * A reference on the file entry is held upon returning. 4584 */ 4585 int 4586 getvnode(struct thread *td, int fd, const cap_rights_t *rightsp, 4587 struct file **fpp) 4588 { 4589 int error; 4590 4591 error = getvnode_path(td, fd, rightsp, NULL, fpp); 4592 if (__predict_false(error != 0)) 4593 return (error); 4594 4595 /* 4596 * Filter out O_PATH file descriptors, most getvnode() callers 4597 * do not call fo_ methods. 4598 */ 4599 if (__predict_false((*fpp)->f_ops == &path_fileops)) { 4600 fdrop(*fpp, td); 4601 *fpp = NULL; 4602 error = EBADF; 4603 } 4604 4605 return (error); 4606 } 4607 4608 /* 4609 * Get an (NFS) file handle. 4610 */ 4611 #ifndef _SYS_SYSPROTO_H_ 4612 struct lgetfh_args { 4613 char *fname; 4614 fhandle_t *fhp; 4615 }; 4616 #endif 4617 int 4618 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4619 { 4620 4621 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4622 UIO_USERSPACE, uap->fhp, UIO_USERSPACE)); 4623 } 4624 4625 #ifndef _SYS_SYSPROTO_H_ 4626 struct getfh_args { 4627 char *fname; 4628 fhandle_t *fhp; 4629 }; 4630 #endif 4631 int 4632 sys_getfh(struct thread *td, struct getfh_args *uap) 4633 { 4634 4635 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4636 uap->fhp, UIO_USERSPACE)); 4637 } 4638 4639 /* 4640 * syscall for the rpc.lockd to use to translate an open descriptor into 4641 * a NFS file handle. 4642 * 4643 * warning: do not remove the priv_check() call or this becomes one giant 4644 * security hole. 4645 */ 4646 #ifndef _SYS_SYSPROTO_H_ 4647 struct getfhat_args { 4648 int fd; 4649 char *path; 4650 fhandle_t *fhp; 4651 int flags; 4652 }; 4653 #endif 4654 int 4655 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4656 { 4657 4658 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4659 uap->fhp, UIO_USERSPACE)); 4660 } 4661 4662 int 4663 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4664 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg) 4665 { 4666 struct nameidata nd; 4667 fhandle_t fh; 4668 struct vnode *vp; 4669 int error; 4670 4671 if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4672 return (EINVAL); 4673 error = priv_check(td, PRIV_VFS_GETFH); 4674 if (error != 0) 4675 return (error); 4676 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4677 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4678 fd); 4679 error = namei(&nd); 4680 if (error != 0) 4681 return (error); 4682 NDFREE_PNBUF(&nd); 4683 vp = nd.ni_vp; 4684 bzero(&fh, sizeof(fh)); 4685 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4686 error = VOP_VPTOFH(vp, &fh.fh_fid); 4687 vput(vp); 4688 if (error == 0) { 4689 if (fhseg == UIO_USERSPACE) 4690 error = copyout(&fh, fhp, sizeof (fh)); 4691 else 4692 memcpy(fhp, &fh, sizeof(fh)); 4693 } 4694 return (error); 4695 } 4696 4697 #ifndef _SYS_SYSPROTO_H_ 4698 struct fhlink_args { 4699 fhandle_t *fhp; 4700 const char *to; 4701 }; 4702 #endif 4703 int 4704 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4705 { 4706 4707 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4708 } 4709 4710 #ifndef _SYS_SYSPROTO_H_ 4711 struct fhlinkat_args { 4712 fhandle_t *fhp; 4713 int tofd; 4714 const char *to; 4715 }; 4716 #endif 4717 int 4718 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4719 { 4720 4721 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4722 } 4723 4724 static int 4725 kern_fhlinkat(struct thread *td, int fd, const char *path, 4726 enum uio_seg pathseg, fhandle_t *fhp) 4727 { 4728 fhandle_t fh; 4729 struct mount *mp; 4730 struct vnode *vp; 4731 int error; 4732 4733 error = priv_check(td, PRIV_VFS_GETFH); 4734 if (error != 0) 4735 return (error); 4736 error = copyin(fhp, &fh, sizeof(fh)); 4737 if (error != 0) 4738 return (error); 4739 do { 4740 bwillwrite(); 4741 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4742 return (ESTALE); 4743 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4744 vfs_unbusy(mp); 4745 if (error != 0) 4746 return (error); 4747 VOP_UNLOCK(vp); 4748 error = kern_linkat_vp(td, vp, fd, path, pathseg); 4749 } while (error == EAGAIN || error == ERELOOKUP); 4750 return (error); 4751 } 4752 4753 #ifndef _SYS_SYSPROTO_H_ 4754 struct fhreadlink_args { 4755 fhandle_t *fhp; 4756 char *buf; 4757 size_t bufsize; 4758 }; 4759 #endif 4760 int 4761 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4762 { 4763 fhandle_t fh; 4764 struct mount *mp; 4765 struct vnode *vp; 4766 int error; 4767 4768 error = priv_check(td, PRIV_VFS_GETFH); 4769 if (error != 0) 4770 return (error); 4771 if (uap->bufsize > IOSIZE_MAX) 4772 return (EINVAL); 4773 error = copyin(uap->fhp, &fh, sizeof(fh)); 4774 if (error != 0) 4775 return (error); 4776 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4777 return (ESTALE); 4778 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4779 vfs_unbusy(mp); 4780 if (error != 0) 4781 return (error); 4782 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4783 vput(vp); 4784 return (error); 4785 } 4786 4787 /* 4788 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4789 * open descriptor. 4790 * 4791 * warning: do not remove the priv_check() call or this becomes one giant 4792 * security hole. 4793 */ 4794 #ifndef _SYS_SYSPROTO_H_ 4795 struct fhopen_args { 4796 const struct fhandle *u_fhp; 4797 int flags; 4798 }; 4799 #endif 4800 int 4801 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4802 { 4803 return (kern_fhopen(td, uap->u_fhp, uap->flags)); 4804 } 4805 4806 int 4807 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags) 4808 { 4809 struct mount *mp; 4810 struct vnode *vp; 4811 struct fhandle fhp; 4812 struct file *fp; 4813 int error, indx; 4814 bool named_attr; 4815 4816 error = priv_check(td, PRIV_VFS_FHOPEN); 4817 if (error != 0) 4818 return (error); 4819 4820 indx = -1; 4821 if ((flags & O_CREAT) != 0) 4822 return (EINVAL); 4823 error = openflags(&flags); 4824 if (error != 0) 4825 return (error); 4826 error = copyin(u_fhp, &fhp, sizeof(fhp)); 4827 if (error != 0) 4828 return (error); 4829 /* find the mount point */ 4830 mp = vfs_busyfs(&fhp.fh_fsid); 4831 if (mp == NULL) 4832 return (ESTALE); 4833 /* now give me my vnode, it gets returned to me locked */ 4834 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4835 vfs_unbusy(mp); 4836 if (error != 0) 4837 return (error); 4838 4839 /* 4840 * Check to see if the file handle refers to a named attribute 4841 * directory or attribute. If it does, the O_NAMEDATTR flag 4842 * must have been specified. 4843 */ 4844 named_attr = (vn_irflag_read(vp) & 4845 (VIRF_NAMEDDIR | VIRF_NAMEDATTR)) != 0; 4846 if ((named_attr && (flags & O_NAMEDATTR) == 0) || 4847 (!named_attr && (flags & O_NAMEDATTR) != 0)) { 4848 vput(vp); 4849 return (ENOATTR); 4850 } 4851 4852 error = falloc_noinstall(td, &fp); 4853 if (error != 0) { 4854 vput(vp); 4855 return (error); 4856 } 4857 /* Set the flags early so the finit in devfs can pick them up. */ 4858 fp->f_flag = flags & FMASK; 4859 4860 #ifdef INVARIANTS 4861 td->td_dupfd = -1; 4862 #endif 4863 error = vn_open_vnode(vp, flags, td->td_ucred, td, fp); 4864 if (error != 0) { 4865 KASSERT(fp->f_ops == &badfileops, 4866 ("VOP_OPEN in fhopen() set f_ops")); 4867 KASSERT(td->td_dupfd < 0, 4868 ("fhopen() encountered fdopen()")); 4869 4870 vput(vp); 4871 goto bad; 4872 } 4873 #ifdef INVARIANTS 4874 td->td_dupfd = 0; 4875 #endif 4876 finit_open(fp, vp, flags); 4877 VOP_UNLOCK(vp); 4878 if ((flags & O_TRUNC) != 0) { 4879 error = fo_truncate(fp, 0, td->td_ucred, td); 4880 if (error != 0) 4881 goto bad; 4882 } 4883 4884 error = finstall(td, fp, &indx, flags, NULL); 4885 bad: 4886 fdrop(fp, td); 4887 td->td_retval[0] = indx; 4888 return (error); 4889 } 4890 4891 /* 4892 * Stat an (NFS) file handle. 4893 */ 4894 #ifndef _SYS_SYSPROTO_H_ 4895 struct fhstat_args { 4896 struct fhandle *u_fhp; 4897 struct stat *sb; 4898 }; 4899 #endif 4900 int 4901 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4902 { 4903 struct stat sb; 4904 struct fhandle fh; 4905 int error; 4906 4907 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4908 if (error != 0) 4909 return (error); 4910 error = kern_fhstat(td, fh, &sb); 4911 if (error == 0) 4912 error = copyout(&sb, uap->sb, sizeof(sb)); 4913 return (error); 4914 } 4915 4916 int 4917 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4918 { 4919 struct mount *mp; 4920 struct vnode *vp; 4921 int error; 4922 4923 error = priv_check(td, PRIV_VFS_FHSTAT); 4924 if (error != 0) 4925 return (error); 4926 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4927 return (ESTALE); 4928 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4929 vfs_unbusy(mp); 4930 if (error != 0) 4931 return (error); 4932 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED); 4933 vput(vp); 4934 return (error); 4935 } 4936 4937 /* 4938 * Implement fstatfs() for (NFS) file handles. 4939 */ 4940 #ifndef _SYS_SYSPROTO_H_ 4941 struct fhstatfs_args { 4942 struct fhandle *u_fhp; 4943 struct statfs *buf; 4944 }; 4945 #endif 4946 int 4947 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4948 { 4949 struct statfs *sfp; 4950 fhandle_t fh; 4951 int error; 4952 4953 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4954 if (error != 0) 4955 return (error); 4956 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4957 error = kern_fhstatfs(td, fh, sfp); 4958 if (error == 0) 4959 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4960 free(sfp, M_STATFS); 4961 return (error); 4962 } 4963 4964 int 4965 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4966 { 4967 struct mount *mp; 4968 struct vnode *vp; 4969 int error; 4970 4971 error = priv_check(td, PRIV_VFS_FHSTATFS); 4972 if (error != 0) 4973 return (error); 4974 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4975 return (ESTALE); 4976 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4977 if (error != 0) { 4978 vfs_unbusy(mp); 4979 return (error); 4980 } 4981 vput(vp); 4982 error = prison_canseemount(td->td_ucred, mp); 4983 if (error != 0) 4984 goto out; 4985 #ifdef MAC 4986 error = mac_mount_check_stat(td->td_ucred, mp); 4987 if (error != 0) 4988 goto out; 4989 #endif 4990 error = VFS_STATFS(mp, buf); 4991 out: 4992 vfs_unbusy(mp); 4993 return (error); 4994 } 4995 4996 /* 4997 * Unlike madvise(2), we do not make a best effort to remember every 4998 * possible caching hint. Instead, we remember the last setting with 4999 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 5000 * region of any current setting. 5001 */ 5002 int 5003 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 5004 int advice) 5005 { 5006 struct fadvise_info *fa, *new; 5007 struct file *fp; 5008 struct vnode *vp; 5009 off_t end; 5010 int error; 5011 5012 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 5013 return (EINVAL); 5014 AUDIT_ARG_VALUE(advice); 5015 switch (advice) { 5016 case POSIX_FADV_SEQUENTIAL: 5017 case POSIX_FADV_RANDOM: 5018 case POSIX_FADV_NOREUSE: 5019 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 5020 break; 5021 case POSIX_FADV_NORMAL: 5022 case POSIX_FADV_WILLNEED: 5023 case POSIX_FADV_DONTNEED: 5024 new = NULL; 5025 break; 5026 default: 5027 return (EINVAL); 5028 } 5029 /* XXX: CAP_POSIX_FADVISE? */ 5030 AUDIT_ARG_FD(fd); 5031 error = fget(td, fd, &cap_no_rights, &fp); 5032 if (error != 0) 5033 goto out; 5034 AUDIT_ARG_FILE(td->td_proc, fp); 5035 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 5036 error = ESPIPE; 5037 goto out; 5038 } 5039 if (fp->f_type != DTYPE_VNODE) { 5040 error = ENODEV; 5041 goto out; 5042 } 5043 vp = fp->f_vnode; 5044 if (vp->v_type != VREG) { 5045 error = ENODEV; 5046 goto out; 5047 } 5048 if (len == 0) 5049 end = OFF_MAX; 5050 else 5051 end = offset + len - 1; 5052 switch (advice) { 5053 case POSIX_FADV_SEQUENTIAL: 5054 case POSIX_FADV_RANDOM: 5055 case POSIX_FADV_NOREUSE: 5056 /* 5057 * Try to merge any existing non-standard region with 5058 * this new region if possible, otherwise create a new 5059 * non-standard region for this request. 5060 */ 5061 mtx_pool_lock(mtxpool_sleep, fp); 5062 fa = fp->f_advice; 5063 if (fa != NULL && fa->fa_advice == advice && 5064 ((fa->fa_start <= end && fa->fa_end >= offset) || 5065 (end != OFF_MAX && fa->fa_start == end + 1) || 5066 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 5067 if (offset < fa->fa_start) 5068 fa->fa_start = offset; 5069 if (end > fa->fa_end) 5070 fa->fa_end = end; 5071 } else { 5072 new->fa_advice = advice; 5073 new->fa_start = offset; 5074 new->fa_end = end; 5075 fp->f_advice = new; 5076 new = fa; 5077 } 5078 mtx_pool_unlock(mtxpool_sleep, fp); 5079 break; 5080 case POSIX_FADV_NORMAL: 5081 /* 5082 * If a the "normal" region overlaps with an existing 5083 * non-standard region, trim or remove the 5084 * non-standard region. 5085 */ 5086 mtx_pool_lock(mtxpool_sleep, fp); 5087 fa = fp->f_advice; 5088 if (fa != NULL) { 5089 if (offset <= fa->fa_start && end >= fa->fa_end) { 5090 new = fa; 5091 fp->f_advice = NULL; 5092 } else if (offset <= fa->fa_start && 5093 end >= fa->fa_start) 5094 fa->fa_start = end + 1; 5095 else if (offset <= fa->fa_end && end >= fa->fa_end) 5096 fa->fa_end = offset - 1; 5097 else if (offset >= fa->fa_start && end <= fa->fa_end) { 5098 /* 5099 * If the "normal" region is a middle 5100 * portion of the existing 5101 * non-standard region, just remove 5102 * the whole thing rather than picking 5103 * one side or the other to 5104 * preserve. 5105 */ 5106 new = fa; 5107 fp->f_advice = NULL; 5108 } 5109 } 5110 mtx_pool_unlock(mtxpool_sleep, fp); 5111 break; 5112 case POSIX_FADV_WILLNEED: 5113 case POSIX_FADV_DONTNEED: 5114 error = VOP_ADVISE(vp, offset, end, advice); 5115 break; 5116 } 5117 out: 5118 if (fp != NULL) 5119 fdrop(fp, td); 5120 free(new, M_FADVISE); 5121 return (error); 5122 } 5123 5124 int 5125 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 5126 { 5127 int error; 5128 5129 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 5130 uap->advice); 5131 return (kern_posix_error(td, error)); 5132 } 5133 5134 int 5135 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 5136 off_t *outoffp, size_t len, unsigned int flags) 5137 { 5138 struct file *infp, *infp1, *outfp, *outfp1; 5139 struct vnode *invp, *outvp; 5140 int error; 5141 size_t retlen; 5142 void *rl_rcookie, *rl_wcookie; 5143 off_t inoff, outoff, savinoff, savoutoff; 5144 bool foffsets_locked, foffsets_set; 5145 5146 infp = outfp = NULL; 5147 rl_rcookie = rl_wcookie = NULL; 5148 foffsets_locked = false; 5149 foffsets_set = false; 5150 error = 0; 5151 retlen = 0; 5152 5153 if ((flags & ~COPY_FILE_RANGE_USERFLAGS) != 0) { 5154 error = EINVAL; 5155 goto out; 5156 } 5157 if (len > SSIZE_MAX) 5158 /* 5159 * Although the len argument is size_t, the return argument 5160 * is ssize_t (which is signed). Therefore a size that won't 5161 * fit in ssize_t can't be returned. 5162 */ 5163 len = SSIZE_MAX; 5164 5165 /* Get the file structures for the file descriptors. */ 5166 error = fget_read(td, infd, 5167 inoffp != NULL ? &cap_pread_rights : &cap_read_rights, &infp); 5168 if (error != 0) 5169 goto out; 5170 if (infp->f_ops == &badfileops) { 5171 error = EBADF; 5172 goto out; 5173 } 5174 if (infp->f_vnode == NULL) { 5175 error = EINVAL; 5176 goto out; 5177 } 5178 error = fget_write(td, outfd, 5179 outoffp != NULL ? &cap_pwrite_rights : &cap_write_rights, &outfp); 5180 if (error != 0) 5181 goto out; 5182 if (outfp->f_ops == &badfileops) { 5183 error = EBADF; 5184 goto out; 5185 } 5186 if (outfp->f_vnode == NULL) { 5187 error = EINVAL; 5188 goto out; 5189 } 5190 5191 /* 5192 * Figure out which file offsets we're reading from and writing to. 5193 * If the offsets come from the file descriptions, we need to lock them, 5194 * and locking both offsets requires a loop to avoid deadlocks. 5195 */ 5196 infp1 = outfp1 = NULL; 5197 if (inoffp != NULL) 5198 inoff = *inoffp; 5199 else 5200 infp1 = infp; 5201 if (outoffp != NULL) 5202 outoff = *outoffp; 5203 else 5204 outfp1 = outfp; 5205 if (infp1 != NULL || outfp1 != NULL) { 5206 if (infp1 == outfp1) { 5207 /* 5208 * Overlapping ranges are not allowed. A more thorough 5209 * check appears below, but we must not lock the same 5210 * offset twice. 5211 */ 5212 error = EINVAL; 5213 goto out; 5214 } 5215 foffset_lock_pair(infp1, &inoff, outfp1, &outoff, 0); 5216 foffsets_locked = true; 5217 } else { 5218 foffsets_set = true; 5219 } 5220 savinoff = inoff; 5221 savoutoff = outoff; 5222 5223 invp = infp->f_vnode; 5224 outvp = outfp->f_vnode; 5225 /* Sanity check the f_flag bits. */ 5226 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 5227 (infp->f_flag & FREAD) == 0) { 5228 error = EBADF; 5229 goto out; 5230 } 5231 5232 /* If len == 0, just return 0. */ 5233 if (len == 0) 5234 goto out; 5235 5236 /* 5237 * Make sure that the ranges we check and lock below are valid. Note 5238 * that len is clamped to SSIZE_MAX above. 5239 */ 5240 if (inoff < 0 || outoff < 0) { 5241 error = EINVAL; 5242 goto out; 5243 } 5244 5245 /* 5246 * If infp and outfp refer to the same file, the byte ranges cannot 5247 * overlap. 5248 */ 5249 if (invp == outvp) { 5250 if ((inoff <= outoff && inoff + len > outoff) || 5251 (inoff > outoff && outoff + len > inoff)) { 5252 error = EINVAL; 5253 goto out; 5254 } 5255 rangelock_may_recurse(&invp->v_rl); 5256 } 5257 5258 /* Range lock the byte ranges for both invp and outvp. */ 5259 for (;;) { 5260 rl_wcookie = vn_rangelock_wlock(outvp, outoff, outoff + len); 5261 rl_rcookie = vn_rangelock_tryrlock(invp, inoff, inoff + len); 5262 if (rl_rcookie != NULL) 5263 break; 5264 vn_rangelock_unlock(outvp, rl_wcookie); 5265 rl_rcookie = vn_rangelock_rlock(invp, inoff, inoff + len); 5266 vn_rangelock_unlock(invp, rl_rcookie); 5267 } 5268 5269 retlen = len; 5270 error = vn_copy_file_range(invp, &inoff, outvp, &outoff, &retlen, 5271 flags, infp->f_cred, outfp->f_cred, td); 5272 out: 5273 if (rl_rcookie != NULL) 5274 vn_rangelock_unlock(invp, rl_rcookie); 5275 if (rl_wcookie != NULL) 5276 vn_rangelock_unlock(outvp, rl_wcookie); 5277 if ((foffsets_locked || foffsets_set) && 5278 (error == EINTR || error == ERESTART)) { 5279 inoff = savinoff; 5280 outoff = savoutoff; 5281 } 5282 if (foffsets_locked) { 5283 if (inoffp == NULL) 5284 foffset_unlock(infp, inoff, 0); 5285 else 5286 *inoffp = inoff; 5287 if (outoffp == NULL) 5288 foffset_unlock(outfp, outoff, 0); 5289 else 5290 *outoffp = outoff; 5291 } else if (foffsets_set) { 5292 *inoffp = inoff; 5293 *outoffp = outoff; 5294 } 5295 if (outfp != NULL) 5296 fdrop(outfp, td); 5297 if (infp != NULL) 5298 fdrop(infp, td); 5299 td->td_retval[0] = retlen; 5300 return (error); 5301 } 5302 5303 int 5304 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 5305 { 5306 off_t inoff, outoff, *inoffp, *outoffp; 5307 int error; 5308 5309 inoffp = outoffp = NULL; 5310 if (uap->inoffp != NULL) { 5311 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 5312 if (error != 0) 5313 return (error); 5314 inoffp = &inoff; 5315 } 5316 if (uap->outoffp != NULL) { 5317 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 5318 if (error != 0) 5319 return (error); 5320 outoffp = &outoff; 5321 } 5322 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 5323 outoffp, uap->len, uap->flags); 5324 if (error == 0 && uap->inoffp != NULL) 5325 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 5326 if (error == 0 && uap->outoffp != NULL) 5327 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 5328 return (error); 5329 } 5330