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 (fvp->v_type == VDIR && 3873 ((fromnd.ni_resflags | tond.ni_resflags) & NIRES_BENEATH) != 0) { 3874 /* 3875 * We must not rename a directory relative to FD_RESOLVE_BENEATH 3876 * descriptors. 3877 */ 3878 error = ENOTCAPABLE; 3879 goto out; 3880 } 3881 if (exchange) { 3882 if (tvp == NULL) { 3883 error = ENOENT; 3884 goto out; 3885 } 3886 if (tvp->v_type == VDIR && fndflags == 0) { 3887 fndflags = WILLBEDIR; 3888 again2: 3889 NDFREE_PNBUF(&fromnd); 3890 vrele(fromnd.ni_dvp); 3891 vrele(fvp); 3892 NDFREE_PNBUF(&tond); 3893 VOP_VPUT_PAIR(tdvp, &tvp, true); 3894 error = sig_intr(); 3895 if (error != 0) 3896 goto out1; 3897 goto again; 3898 } 3899 if (tvp->v_type != VDIR && fndflags != 0) { 3900 fndflags = 0; 3901 goto again2; 3902 } 3903 } 3904 error = vn_start_write(fvp, &mp, V_NOWAIT); 3905 if (error != 0) { 3906 again1: 3907 NDFREE_PNBUF(&fromnd); 3908 NDFREE_PNBUF(&tond); 3909 if (tvp != NULL) 3910 vput(tvp); 3911 if (tdvp == tvp) 3912 vrele(tdvp); 3913 else 3914 vput(tdvp); 3915 vrele(fromnd.ni_dvp); 3916 vrele(fvp); 3917 if (tmp != NULL) { 3918 lockmgr(&tmp->mnt_renamelock, LK_EXCLUSIVE, NULL); 3919 lockmgr(&tmp->mnt_renamelock, LK_RELEASE, NULL); 3920 vfs_rel(tmp); 3921 tmp = NULL; 3922 } 3923 error = sig_intr(); 3924 if (error != 0) 3925 return (error); 3926 error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH); 3927 if (error != 0) 3928 return (error); 3929 goto again; 3930 } 3931 error = VOP_GETWRITEMOUNT(tdvp, &tmp); 3932 if (error != 0 || tmp == NULL) 3933 goto again1; 3934 error = lockmgr(&tmp->mnt_renamelock, LK_EXCLUSIVE | LK_NOWAIT, NULL); 3935 if (error != 0) { 3936 vn_finished_write(mp); 3937 goto again1; 3938 } 3939 irflag = vn_irflag_read(fvp); 3940 if (((irflag & VIRF_NAMEDATTR) != 0 && tdvp != fromnd.ni_dvp) || 3941 (irflag & VIRF_NAMEDDIR) != 0) { 3942 error = EINVAL; 3943 goto out; 3944 } 3945 if (tvp != NULL) { 3946 if (!exchange) { 3947 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3948 error = ENOTDIR; 3949 goto out; 3950 } else if (fvp->v_type != VDIR && 3951 tvp->v_type == VDIR) { 3952 error = EISDIR; 3953 goto out; 3954 } 3955 } 3956 #ifdef CAPABILITIES 3957 if (tofd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3958 /* 3959 * If the target already exists we require CAP_UNLINKAT 3960 * from 'tofd', when tofd was used for the lookup. 3961 */ 3962 error = cap_check(&tond.ni_filecaps.fc_rights, 3963 &cap_unlinkat_rights); 3964 if (error != 0) 3965 goto out; 3966 } 3967 #endif 3968 } 3969 if (fvp == tdvp) { 3970 error = EINVAL; 3971 goto out; 3972 } 3973 /* 3974 * If the source is the same as the destination (that is, if they 3975 * are links to the same vnode), then there is nothing to do. 3976 */ 3977 if (fvp == tvp) 3978 error = ERESTART; 3979 #ifdef MAC 3980 else 3981 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3982 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3983 #endif 3984 out: 3985 if (error == 0) { 3986 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3987 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd, flags); 3988 NDFREE_PNBUF(&fromnd); 3989 NDFREE_PNBUF(&tond); 3990 } else { 3991 NDFREE_PNBUF(&fromnd); 3992 NDFREE_PNBUF(&tond); 3993 if (tvp != NULL) 3994 vput(tvp); 3995 if (tdvp == tvp) 3996 vrele(tdvp); 3997 else 3998 vput(tdvp); 3999 vrele(fromnd.ni_dvp); 4000 vrele(fvp); 4001 } 4002 if (tmp != NULL) { 4003 lockmgr(&tmp->mnt_renamelock, LK_RELEASE, 0); 4004 vfs_rel(tmp); 4005 } 4006 if (mp != NULL) 4007 vn_finished_write(mp); 4008 out1: 4009 if (error == ERESTART) 4010 return (0); 4011 if (error == ERELOOKUP) { 4012 error = sig_intr(); 4013 if (error == 0) 4014 goto again; 4015 } 4016 return (error); 4017 } 4018 4019 /* 4020 * Make a directory file. 4021 */ 4022 #ifndef _SYS_SYSPROTO_H_ 4023 struct mkdir_args { 4024 char *path; 4025 int mode; 4026 }; 4027 #endif 4028 int 4029 sys_mkdir(struct thread *td, struct mkdir_args *uap) 4030 { 4031 4032 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 4033 uap->mode)); 4034 } 4035 4036 #ifndef _SYS_SYSPROTO_H_ 4037 struct mkdirat_args { 4038 int fd; 4039 char *path; 4040 mode_t mode; 4041 }; 4042 #endif 4043 int 4044 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 4045 { 4046 4047 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 4048 } 4049 4050 int 4051 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 4052 int mode) 4053 { 4054 struct mount *mp; 4055 struct vattr vattr; 4056 struct nameidata nd; 4057 int error; 4058 4059 AUDIT_ARG_MODE(mode); 4060 NDPREINIT(&nd); 4061 restart: 4062 bwillwrite(); 4063 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | 4064 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR, 4065 segflg, path, fd, &cap_mkdirat_rights); 4066 if ((error = namei(&nd)) != 0) 4067 return (error); 4068 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 4069 NDFREE_PNBUF(&nd); 4070 vput(nd.ni_dvp); 4071 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 4072 return (error); 4073 goto restart; 4074 } 4075 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 4076 error = EINVAL; 4077 goto out; 4078 } 4079 VATTR_NULL(&vattr); 4080 vattr.va_type = VDIR; 4081 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask; 4082 #ifdef MAC 4083 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 4084 &vattr); 4085 if (error != 0) 4086 goto out; 4087 #endif 4088 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 4089 out: 4090 NDFREE_PNBUF(&nd); 4091 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 4092 vn_finished_write(mp); 4093 if (error == ERELOOKUP) 4094 goto restart; 4095 return (error); 4096 } 4097 4098 /* 4099 * Remove a directory file. 4100 */ 4101 #ifndef _SYS_SYSPROTO_H_ 4102 struct rmdir_args { 4103 char *path; 4104 }; 4105 #endif 4106 int 4107 sys_rmdir(struct thread *td, struct rmdir_args *uap) 4108 { 4109 4110 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 4111 0)); 4112 } 4113 4114 int 4115 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 4116 enum uio_seg pathseg, int flag) 4117 { 4118 struct mount *mp; 4119 struct vnode *vp; 4120 struct file *fp; 4121 struct nameidata nd; 4122 cap_rights_t rights; 4123 int error; 4124 4125 fp = NULL; 4126 if (fd != FD_NONE) { 4127 error = getvnode(td, fd, cap_rights_init_one(&rights, 4128 CAP_LOOKUP), &fp); 4129 if (error != 0) 4130 return (error); 4131 } 4132 4133 NDPREINIT(&nd); 4134 restart: 4135 bwillwrite(); 4136 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 4137 at2cnpflags(flag, AT_RESOLVE_BENEATH), 4138 pathseg, path, dfd, &cap_unlinkat_rights); 4139 if ((error = namei(&nd)) != 0) 4140 goto fdout; 4141 vp = nd.ni_vp; 4142 if (vp->v_type != VDIR) { 4143 error = ENOTDIR; 4144 goto out; 4145 } 4146 /* 4147 * No rmdir "." please. 4148 */ 4149 if (nd.ni_dvp == vp) { 4150 error = EINVAL; 4151 goto out; 4152 } 4153 /* 4154 * The root of a mounted filesystem cannot be deleted. 4155 */ 4156 if (vp->v_vflag & VV_ROOT) { 4157 error = EBUSY; 4158 goto out; 4159 } 4160 4161 if (fp != NULL && fp->f_vnode != vp) { 4162 if (VN_IS_DOOMED(fp->f_vnode)) 4163 error = EBADF; 4164 else 4165 error = EDEADLK; 4166 goto out; 4167 } 4168 4169 #ifdef MAC 4170 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 4171 &nd.ni_cnd); 4172 if (error != 0) 4173 goto out; 4174 #endif 4175 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 4176 NDFREE_PNBUF(&nd); 4177 vput(vp); 4178 if (nd.ni_dvp == vp) 4179 vrele(nd.ni_dvp); 4180 else 4181 vput(nd.ni_dvp); 4182 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 4183 goto fdout; 4184 goto restart; 4185 } 4186 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 4187 vn_finished_write(mp); 4188 out: 4189 NDFREE_PNBUF(&nd); 4190 vput(vp); 4191 if (nd.ni_dvp == vp) 4192 vrele(nd.ni_dvp); 4193 else 4194 vput(nd.ni_dvp); 4195 if (error == ERELOOKUP) 4196 goto restart; 4197 fdout: 4198 if (fp != NULL) 4199 fdrop(fp, td); 4200 return (error); 4201 } 4202 4203 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 4204 int 4205 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 4206 long *basep, void (*func)(struct freebsd11_dirent *)) 4207 { 4208 struct freebsd11_dirent dstdp; 4209 struct dirent *dp, *edp; 4210 char *dirbuf; 4211 off_t base; 4212 ssize_t resid, ucount; 4213 int error; 4214 4215 /* XXX arbitrary sanity limit on `count'. */ 4216 count = min(count, 64 * 1024); 4217 4218 dirbuf = malloc(count, M_TEMP, M_WAITOK); 4219 4220 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 4221 UIO_SYSSPACE); 4222 if (error != 0) 4223 goto done; 4224 if (basep != NULL) 4225 *basep = base; 4226 4227 ucount = 0; 4228 for (dp = (struct dirent *)dirbuf, 4229 edp = (struct dirent *)&dirbuf[count - resid]; 4230 ucount < count && dp < edp; ) { 4231 if (dp->d_reclen == 0) 4232 break; 4233 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 4234 if (dp->d_namlen >= sizeof(dstdp.d_name)) 4235 continue; 4236 dstdp.d_type = dp->d_type; 4237 dstdp.d_namlen = dp->d_namlen; 4238 dstdp.d_fileno = dp->d_fileno; /* truncate */ 4239 if (dstdp.d_fileno != dp->d_fileno) { 4240 switch (ino64_trunc_error) { 4241 default: 4242 case 0: 4243 break; 4244 case 1: 4245 error = EOVERFLOW; 4246 goto done; 4247 case 2: 4248 dstdp.d_fileno = UINT32_MAX; 4249 break; 4250 } 4251 } 4252 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 4253 ((dp->d_namlen + 1 + 3) &~ 3); 4254 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 4255 bzero(dstdp.d_name + dstdp.d_namlen, 4256 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 4257 dstdp.d_namlen); 4258 MPASS(dstdp.d_reclen <= dp->d_reclen); 4259 MPASS(ucount + dstdp.d_reclen <= count); 4260 if (func != NULL) 4261 func(&dstdp); 4262 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 4263 if (error != 0) 4264 break; 4265 dp = (struct dirent *)((char *)dp + dp->d_reclen); 4266 ucount += dstdp.d_reclen; 4267 } 4268 4269 done: 4270 free(dirbuf, M_TEMP); 4271 if (error == 0) 4272 td->td_retval[0] = ucount; 4273 return (error); 4274 } 4275 #endif /* COMPAT */ 4276 4277 #ifdef COMPAT_43 4278 static void 4279 ogetdirentries_cvt(struct freebsd11_dirent *dp) 4280 { 4281 #if (BYTE_ORDER == LITTLE_ENDIAN) 4282 /* 4283 * The expected low byte of dp->d_namlen is our dp->d_type. 4284 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 4285 */ 4286 dp->d_type = dp->d_namlen; 4287 dp->d_namlen = 0; 4288 #else 4289 /* 4290 * The dp->d_type is the high byte of the expected dp->d_namlen, 4291 * so must be zero'ed. 4292 */ 4293 dp->d_type = 0; 4294 #endif 4295 } 4296 4297 /* 4298 * Read a block of directory entries in a filesystem independent format. 4299 */ 4300 #ifndef _SYS_SYSPROTO_H_ 4301 struct ogetdirentries_args { 4302 int fd; 4303 char *buf; 4304 u_int count; 4305 long *basep; 4306 }; 4307 #endif 4308 int 4309 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 4310 { 4311 long loff; 4312 int error; 4313 4314 error = kern_ogetdirentries(td, uap, &loff); 4315 if (error == 0) 4316 error = copyout(&loff, uap->basep, sizeof(long)); 4317 return (error); 4318 } 4319 4320 int 4321 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 4322 long *ploff) 4323 { 4324 long base; 4325 int error; 4326 4327 /* XXX arbitrary sanity limit on `count'. */ 4328 if (uap->count > 64 * 1024) 4329 return (EINVAL); 4330 4331 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4332 &base, ogetdirentries_cvt); 4333 4334 if (error == 0 && uap->basep != NULL) 4335 error = copyout(&base, uap->basep, sizeof(long)); 4336 4337 return (error); 4338 } 4339 #endif /* COMPAT_43 */ 4340 4341 #if defined(COMPAT_FREEBSD11) 4342 #ifndef _SYS_SYSPROTO_H_ 4343 struct freebsd11_getdirentries_args { 4344 int fd; 4345 char *buf; 4346 u_int count; 4347 long *basep; 4348 }; 4349 #endif 4350 int 4351 freebsd11_getdirentries(struct thread *td, 4352 struct freebsd11_getdirentries_args *uap) 4353 { 4354 long base; 4355 int error; 4356 4357 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4358 &base, NULL); 4359 4360 if (error == 0 && uap->basep != NULL) 4361 error = copyout(&base, uap->basep, sizeof(long)); 4362 return (error); 4363 } 4364 4365 int 4366 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 4367 { 4368 struct freebsd11_getdirentries_args ap; 4369 4370 ap.fd = uap->fd; 4371 ap.buf = uap->buf; 4372 ap.count = uap->count; 4373 ap.basep = NULL; 4374 return (freebsd11_getdirentries(td, &ap)); 4375 } 4376 #endif /* COMPAT_FREEBSD11 */ 4377 4378 /* 4379 * Read a block of directory entries in a filesystem independent format. 4380 */ 4381 int 4382 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4383 { 4384 off_t base; 4385 int error; 4386 4387 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4388 NULL, UIO_USERSPACE); 4389 if (error != 0) 4390 return (error); 4391 if (uap->basep != NULL) 4392 error = copyout(&base, uap->basep, sizeof(off_t)); 4393 return (error); 4394 } 4395 4396 int 4397 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4398 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4399 { 4400 struct vnode *vp; 4401 struct file *fp; 4402 struct uio auio; 4403 struct iovec aiov; 4404 off_t loff; 4405 int error, eofflag; 4406 off_t foffset; 4407 4408 AUDIT_ARG_FD(fd); 4409 if (count > IOSIZE_MAX) 4410 return (EINVAL); 4411 auio.uio_resid = count; 4412 error = getvnode(td, fd, &cap_read_rights, &fp); 4413 if (error != 0) 4414 return (error); 4415 if ((fp->f_flag & FREAD) == 0) { 4416 fdrop(fp, td); 4417 return (EBADF); 4418 } 4419 vp = fp->f_vnode; 4420 foffset = foffset_lock(fp, 0); 4421 unionread: 4422 if (__predict_false((vp->v_vflag & VV_UNLINKED) != 0)) { 4423 error = ENOENT; 4424 goto fail; 4425 } 4426 aiov.iov_base = buf; 4427 aiov.iov_len = count; 4428 auio.uio_iov = &aiov; 4429 auio.uio_iovcnt = 1; 4430 auio.uio_rw = UIO_READ; 4431 auio.uio_segflg = bufseg; 4432 auio.uio_td = td; 4433 vn_lock(vp, LK_SHARED | LK_RETRY); 4434 /* 4435 * We want to return ENOTDIR for anything that is not VDIR, but 4436 * not for VBAD, and we can't check for VBAD while the vnode is 4437 * unlocked. 4438 */ 4439 if (vp->v_type != VDIR) { 4440 if (vp->v_type == VBAD) 4441 error = EBADF; 4442 else 4443 error = ENOTDIR; 4444 VOP_UNLOCK(vp); 4445 goto fail; 4446 } 4447 AUDIT_ARG_VNODE1(vp); 4448 loff = auio.uio_offset = foffset; 4449 #ifdef MAC 4450 error = mac_vnode_check_readdir(td->td_ucred, vp); 4451 if (error == 0) 4452 #endif 4453 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4454 NULL); 4455 foffset = auio.uio_offset; 4456 if (error != 0) { 4457 VOP_UNLOCK(vp); 4458 goto fail; 4459 } 4460 if (count == auio.uio_resid && 4461 (vp->v_vflag & VV_ROOT) && 4462 (vp->v_mount->mnt_flag & MNT_UNION)) { 4463 struct vnode *tvp = vp; 4464 4465 vp = vp->v_mount->mnt_vnodecovered; 4466 vref(vp); 4467 fp->f_vnode = vp; 4468 foffset = 0; 4469 vput(tvp); 4470 goto unionread; 4471 } 4472 VOP_UNLOCK(vp); 4473 *basep = loff; 4474 if (residp != NULL) 4475 *residp = auio.uio_resid; 4476 td->td_retval[0] = count - auio.uio_resid; 4477 fail: 4478 foffset_unlock(fp, foffset, 0); 4479 fdrop(fp, td); 4480 return (error); 4481 } 4482 4483 /* 4484 * Set the mode mask for creation of filesystem nodes. 4485 */ 4486 #ifndef _SYS_SYSPROTO_H_ 4487 struct umask_args { 4488 int newmask; 4489 }; 4490 #endif 4491 int 4492 sys_umask(struct thread *td, struct umask_args *uap) 4493 { 4494 struct pwddesc *pdp; 4495 4496 pdp = td->td_proc->p_pd; 4497 PWDDESC_XLOCK(pdp); 4498 td->td_retval[0] = pdp->pd_cmask; 4499 pdp->pd_cmask = uap->newmask & ALLPERMS; 4500 PWDDESC_XUNLOCK(pdp); 4501 return (0); 4502 } 4503 4504 /* 4505 * Void all references to file by ripping underlying filesystem away from 4506 * vnode. 4507 */ 4508 #ifndef _SYS_SYSPROTO_H_ 4509 struct revoke_args { 4510 char *path; 4511 }; 4512 #endif 4513 int 4514 sys_revoke(struct thread *td, struct revoke_args *uap) 4515 { 4516 struct vnode *vp; 4517 struct vattr vattr; 4518 struct nameidata nd; 4519 int error; 4520 4521 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4522 uap->path); 4523 if ((error = namei(&nd)) != 0) 4524 return (error); 4525 vp = nd.ni_vp; 4526 NDFREE_PNBUF(&nd); 4527 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4528 error = EINVAL; 4529 goto out; 4530 } 4531 #ifdef MAC 4532 error = mac_vnode_check_revoke(td->td_ucred, vp); 4533 if (error != 0) 4534 goto out; 4535 #endif 4536 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4537 if (error != 0) 4538 goto out; 4539 if (td->td_ucred->cr_uid != vattr.va_uid) { 4540 error = priv_check(td, PRIV_VFS_ADMIN); 4541 if (error != 0) 4542 goto out; 4543 } 4544 if (devfs_usecount(vp) > 0) 4545 VOP_REVOKE(vp, REVOKEALL); 4546 out: 4547 vput(vp); 4548 return (error); 4549 } 4550 4551 /* 4552 * This variant of getvnode() allows O_PATH files. Caller should 4553 * ensure that returned file and vnode are only used for compatible 4554 * semantics. 4555 */ 4556 int 4557 getvnode_path(struct thread *td, int fd, const cap_rights_t *rightsp, 4558 uint8_t *flagsp, struct file **fpp) 4559 { 4560 struct file *fp; 4561 int error; 4562 4563 error = fget_unlocked_flags(td, fd, rightsp, flagsp, &fp); 4564 if (error != 0) 4565 return (error); 4566 4567 /* 4568 * The file could be not of the vnode type, or it may be not 4569 * yet fully initialized, in which case the f_vnode pointer 4570 * may be set, but f_ops is still badfileops. E.g., 4571 * devfs_open() transiently create such situation to 4572 * facilitate csw d_fdopen(). 4573 * 4574 * Dupfdopen() handling in kern_openat() installs the 4575 * half-baked file into the process descriptor table, allowing 4576 * other thread to dereference it. Guard against the race by 4577 * checking f_ops. 4578 */ 4579 if (__predict_false(fp->f_vnode == NULL || fp->f_ops == &badfileops)) { 4580 fdrop(fp, td); 4581 *fpp = NULL; 4582 return (EINVAL); 4583 } 4584 4585 *fpp = fp; 4586 return (0); 4587 } 4588 4589 /* 4590 * Convert a user file descriptor to a kernel file entry and check 4591 * that, if it is a capability, the correct rights are present. 4592 * A reference on the file entry is held upon returning. 4593 */ 4594 int 4595 getvnode(struct thread *td, int fd, const cap_rights_t *rightsp, 4596 struct file **fpp) 4597 { 4598 int error; 4599 4600 error = getvnode_path(td, fd, rightsp, NULL, fpp); 4601 if (__predict_false(error != 0)) 4602 return (error); 4603 4604 /* 4605 * Filter out O_PATH file descriptors, most getvnode() callers 4606 * do not call fo_ methods. 4607 */ 4608 if (__predict_false((*fpp)->f_ops == &path_fileops)) { 4609 fdrop(*fpp, td); 4610 *fpp = NULL; 4611 error = EBADF; 4612 } 4613 4614 return (error); 4615 } 4616 4617 /* 4618 * Get an (NFS) file handle. 4619 */ 4620 #ifndef _SYS_SYSPROTO_H_ 4621 struct lgetfh_args { 4622 char *fname; 4623 fhandle_t *fhp; 4624 }; 4625 #endif 4626 int 4627 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4628 { 4629 4630 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4631 UIO_USERSPACE, uap->fhp, UIO_USERSPACE)); 4632 } 4633 4634 #ifndef _SYS_SYSPROTO_H_ 4635 struct getfh_args { 4636 char *fname; 4637 fhandle_t *fhp; 4638 }; 4639 #endif 4640 int 4641 sys_getfh(struct thread *td, struct getfh_args *uap) 4642 { 4643 4644 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4645 uap->fhp, UIO_USERSPACE)); 4646 } 4647 4648 /* 4649 * syscall for the rpc.lockd to use to translate an open descriptor into 4650 * a NFS file handle. 4651 * 4652 * warning: do not remove the priv_check() call or this becomes one giant 4653 * security hole. 4654 */ 4655 #ifndef _SYS_SYSPROTO_H_ 4656 struct getfhat_args { 4657 int fd; 4658 char *path; 4659 fhandle_t *fhp; 4660 int flags; 4661 }; 4662 #endif 4663 int 4664 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4665 { 4666 4667 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4668 uap->fhp, UIO_USERSPACE)); 4669 } 4670 4671 int 4672 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4673 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg) 4674 { 4675 struct nameidata nd; 4676 fhandle_t fh; 4677 struct vnode *vp; 4678 int error; 4679 4680 if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4681 return (EINVAL); 4682 error = priv_check(td, PRIV_VFS_GETFH); 4683 if (error != 0) 4684 return (error); 4685 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4686 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4687 fd); 4688 error = namei(&nd); 4689 if (error != 0) 4690 return (error); 4691 NDFREE_PNBUF(&nd); 4692 vp = nd.ni_vp; 4693 bzero(&fh, sizeof(fh)); 4694 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4695 error = VOP_VPTOFH(vp, &fh.fh_fid); 4696 vput(vp); 4697 if (error == 0) { 4698 if (fhseg == UIO_USERSPACE) 4699 error = copyout(&fh, fhp, sizeof (fh)); 4700 else 4701 memcpy(fhp, &fh, sizeof(fh)); 4702 } 4703 return (error); 4704 } 4705 4706 #ifndef _SYS_SYSPROTO_H_ 4707 struct fhlink_args { 4708 fhandle_t *fhp; 4709 const char *to; 4710 }; 4711 #endif 4712 int 4713 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4714 { 4715 4716 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4717 } 4718 4719 #ifndef _SYS_SYSPROTO_H_ 4720 struct fhlinkat_args { 4721 fhandle_t *fhp; 4722 int tofd; 4723 const char *to; 4724 }; 4725 #endif 4726 int 4727 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4728 { 4729 4730 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4731 } 4732 4733 static int 4734 kern_fhlinkat(struct thread *td, int fd, const char *path, 4735 enum uio_seg pathseg, fhandle_t *fhp) 4736 { 4737 fhandle_t fh; 4738 struct mount *mp; 4739 struct vnode *vp; 4740 int error; 4741 4742 error = priv_check(td, PRIV_VFS_GETFH); 4743 if (error != 0) 4744 return (error); 4745 error = copyin(fhp, &fh, sizeof(fh)); 4746 if (error != 0) 4747 return (error); 4748 do { 4749 bwillwrite(); 4750 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4751 return (ESTALE); 4752 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4753 vfs_unbusy(mp); 4754 if (error != 0) 4755 return (error); 4756 VOP_UNLOCK(vp); 4757 error = kern_linkat_vp(td, vp, fd, path, pathseg); 4758 } while (error == EAGAIN || error == ERELOOKUP); 4759 return (error); 4760 } 4761 4762 #ifndef _SYS_SYSPROTO_H_ 4763 struct fhreadlink_args { 4764 fhandle_t *fhp; 4765 char *buf; 4766 size_t bufsize; 4767 }; 4768 #endif 4769 int 4770 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4771 { 4772 fhandle_t fh; 4773 struct mount *mp; 4774 struct vnode *vp; 4775 int error; 4776 4777 error = priv_check(td, PRIV_VFS_GETFH); 4778 if (error != 0) 4779 return (error); 4780 if (uap->bufsize > IOSIZE_MAX) 4781 return (EINVAL); 4782 error = copyin(uap->fhp, &fh, sizeof(fh)); 4783 if (error != 0) 4784 return (error); 4785 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4786 return (ESTALE); 4787 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4788 vfs_unbusy(mp); 4789 if (error != 0) 4790 return (error); 4791 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4792 vput(vp); 4793 return (error); 4794 } 4795 4796 /* 4797 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4798 * open descriptor. 4799 * 4800 * warning: do not remove the priv_check() call or this becomes one giant 4801 * security hole. 4802 */ 4803 #ifndef _SYS_SYSPROTO_H_ 4804 struct fhopen_args { 4805 const struct fhandle *u_fhp; 4806 int flags; 4807 }; 4808 #endif 4809 int 4810 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4811 { 4812 return (kern_fhopen(td, uap->u_fhp, uap->flags)); 4813 } 4814 4815 int 4816 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags) 4817 { 4818 struct mount *mp; 4819 struct vnode *vp; 4820 struct fhandle fhp; 4821 struct file *fp; 4822 int error, indx; 4823 bool named_attr; 4824 4825 error = priv_check(td, PRIV_VFS_FHOPEN); 4826 if (error != 0) 4827 return (error); 4828 4829 indx = -1; 4830 if ((flags & O_CREAT) != 0) 4831 return (EINVAL); 4832 error = openflags(&flags); 4833 if (error != 0) 4834 return (error); 4835 error = copyin(u_fhp, &fhp, sizeof(fhp)); 4836 if (error != 0) 4837 return (error); 4838 /* find the mount point */ 4839 mp = vfs_busyfs(&fhp.fh_fsid); 4840 if (mp == NULL) 4841 return (ESTALE); 4842 /* now give me my vnode, it gets returned to me locked */ 4843 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4844 vfs_unbusy(mp); 4845 if (error != 0) 4846 return (error); 4847 4848 /* 4849 * Check to see if the file handle refers to a named attribute 4850 * directory or attribute. If it does, the O_NAMEDATTR flag 4851 * must have been specified. 4852 */ 4853 named_attr = (vn_irflag_read(vp) & 4854 (VIRF_NAMEDDIR | VIRF_NAMEDATTR)) != 0; 4855 if ((named_attr && (flags & O_NAMEDATTR) == 0) || 4856 (!named_attr && (flags & O_NAMEDATTR) != 0)) { 4857 vput(vp); 4858 return (ENOATTR); 4859 } 4860 4861 error = falloc_noinstall(td, &fp); 4862 if (error != 0) { 4863 vput(vp); 4864 return (error); 4865 } 4866 /* Set the flags early so the finit in devfs can pick them up. */ 4867 fp->f_flag = flags & FMASK; 4868 4869 #ifdef INVARIANTS 4870 td->td_dupfd = -1; 4871 #endif 4872 error = vn_open_vnode(vp, flags, td->td_ucred, td, fp); 4873 if (error != 0) { 4874 KASSERT(fp->f_ops == &badfileops, 4875 ("VOP_OPEN in fhopen() set f_ops")); 4876 KASSERT(td->td_dupfd < 0, 4877 ("fhopen() encountered fdopen()")); 4878 4879 vput(vp); 4880 goto bad; 4881 } 4882 #ifdef INVARIANTS 4883 td->td_dupfd = 0; 4884 #endif 4885 finit_open(fp, vp, flags); 4886 VOP_UNLOCK(vp); 4887 if ((flags & O_TRUNC) != 0) { 4888 error = fo_truncate(fp, 0, td->td_ucred, td); 4889 if (error != 0) 4890 goto bad; 4891 } 4892 4893 error = finstall(td, fp, &indx, flags, NULL); 4894 bad: 4895 fdrop(fp, td); 4896 td->td_retval[0] = indx; 4897 return (error); 4898 } 4899 4900 /* 4901 * Stat an (NFS) file handle. 4902 */ 4903 #ifndef _SYS_SYSPROTO_H_ 4904 struct fhstat_args { 4905 struct fhandle *u_fhp; 4906 struct stat *sb; 4907 }; 4908 #endif 4909 int 4910 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4911 { 4912 struct stat sb; 4913 struct fhandle fh; 4914 int error; 4915 4916 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4917 if (error != 0) 4918 return (error); 4919 error = kern_fhstat(td, fh, &sb); 4920 if (error == 0) 4921 error = copyout(&sb, uap->sb, sizeof(sb)); 4922 return (error); 4923 } 4924 4925 int 4926 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4927 { 4928 struct mount *mp; 4929 struct vnode *vp; 4930 int error; 4931 4932 error = priv_check(td, PRIV_VFS_FHSTAT); 4933 if (error != 0) 4934 return (error); 4935 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4936 return (ESTALE); 4937 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4938 vfs_unbusy(mp); 4939 if (error != 0) 4940 return (error); 4941 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED); 4942 vput(vp); 4943 return (error); 4944 } 4945 4946 /* 4947 * Implement fstatfs() for (NFS) file handles. 4948 */ 4949 #ifndef _SYS_SYSPROTO_H_ 4950 struct fhstatfs_args { 4951 struct fhandle *u_fhp; 4952 struct statfs *buf; 4953 }; 4954 #endif 4955 int 4956 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4957 { 4958 struct statfs *sfp; 4959 fhandle_t fh; 4960 int error; 4961 4962 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4963 if (error != 0) 4964 return (error); 4965 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4966 error = kern_fhstatfs(td, fh, sfp); 4967 if (error == 0) 4968 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4969 free(sfp, M_STATFS); 4970 return (error); 4971 } 4972 4973 int 4974 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4975 { 4976 struct mount *mp; 4977 struct vnode *vp; 4978 int error; 4979 4980 error = priv_check(td, PRIV_VFS_FHSTATFS); 4981 if (error != 0) 4982 return (error); 4983 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4984 return (ESTALE); 4985 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4986 if (error != 0) { 4987 vfs_unbusy(mp); 4988 return (error); 4989 } 4990 vput(vp); 4991 error = prison_canseemount(td->td_ucred, mp); 4992 if (error != 0) 4993 goto out; 4994 #ifdef MAC 4995 error = mac_mount_check_stat(td->td_ucred, mp); 4996 if (error != 0) 4997 goto out; 4998 #endif 4999 error = VFS_STATFS(mp, buf); 5000 out: 5001 vfs_unbusy(mp); 5002 return (error); 5003 } 5004 5005 /* 5006 * Unlike madvise(2), we do not make a best effort to remember every 5007 * possible caching hint. Instead, we remember the last setting with 5008 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 5009 * region of any current setting. 5010 */ 5011 int 5012 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 5013 int advice) 5014 { 5015 struct fadvise_info *fa, *new; 5016 struct file *fp; 5017 struct vnode *vp; 5018 off_t end; 5019 int error; 5020 5021 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 5022 return (EINVAL); 5023 AUDIT_ARG_VALUE(advice); 5024 switch (advice) { 5025 case POSIX_FADV_SEQUENTIAL: 5026 case POSIX_FADV_RANDOM: 5027 case POSIX_FADV_NOREUSE: 5028 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 5029 break; 5030 case POSIX_FADV_NORMAL: 5031 case POSIX_FADV_WILLNEED: 5032 case POSIX_FADV_DONTNEED: 5033 new = NULL; 5034 break; 5035 default: 5036 return (EINVAL); 5037 } 5038 /* XXX: CAP_POSIX_FADVISE? */ 5039 AUDIT_ARG_FD(fd); 5040 error = fget(td, fd, &cap_no_rights, &fp); 5041 if (error != 0) 5042 goto out; 5043 AUDIT_ARG_FILE(td->td_proc, fp); 5044 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 5045 error = ESPIPE; 5046 goto out; 5047 } 5048 if (fp->f_type != DTYPE_VNODE) { 5049 error = ENODEV; 5050 goto out; 5051 } 5052 vp = fp->f_vnode; 5053 if (vp->v_type != VREG) { 5054 error = ENODEV; 5055 goto out; 5056 } 5057 if (len == 0) 5058 end = OFF_MAX; 5059 else 5060 end = offset + len - 1; 5061 switch (advice) { 5062 case POSIX_FADV_SEQUENTIAL: 5063 case POSIX_FADV_RANDOM: 5064 case POSIX_FADV_NOREUSE: 5065 /* 5066 * Try to merge any existing non-standard region with 5067 * this new region if possible, otherwise create a new 5068 * non-standard region for this request. 5069 */ 5070 mtx_pool_lock(mtxpool_sleep, fp); 5071 fa = fp->f_advice; 5072 if (fa != NULL && fa->fa_advice == advice && 5073 ((fa->fa_start <= end && fa->fa_end >= offset) || 5074 (end != OFF_MAX && fa->fa_start == end + 1) || 5075 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 5076 if (offset < fa->fa_start) 5077 fa->fa_start = offset; 5078 if (end > fa->fa_end) 5079 fa->fa_end = end; 5080 } else { 5081 new->fa_advice = advice; 5082 new->fa_start = offset; 5083 new->fa_end = end; 5084 fp->f_advice = new; 5085 new = fa; 5086 } 5087 mtx_pool_unlock(mtxpool_sleep, fp); 5088 break; 5089 case POSIX_FADV_NORMAL: 5090 /* 5091 * If a the "normal" region overlaps with an existing 5092 * non-standard region, trim or remove the 5093 * non-standard region. 5094 */ 5095 mtx_pool_lock(mtxpool_sleep, fp); 5096 fa = fp->f_advice; 5097 if (fa != NULL) { 5098 if (offset <= fa->fa_start && end >= fa->fa_end) { 5099 new = fa; 5100 fp->f_advice = NULL; 5101 } else if (offset <= fa->fa_start && 5102 end >= fa->fa_start) 5103 fa->fa_start = end + 1; 5104 else if (offset <= fa->fa_end && end >= fa->fa_end) 5105 fa->fa_end = offset - 1; 5106 else if (offset >= fa->fa_start && end <= fa->fa_end) { 5107 /* 5108 * If the "normal" region is a middle 5109 * portion of the existing 5110 * non-standard region, just remove 5111 * the whole thing rather than picking 5112 * one side or the other to 5113 * preserve. 5114 */ 5115 new = fa; 5116 fp->f_advice = NULL; 5117 } 5118 } 5119 mtx_pool_unlock(mtxpool_sleep, fp); 5120 break; 5121 case POSIX_FADV_WILLNEED: 5122 case POSIX_FADV_DONTNEED: 5123 error = VOP_ADVISE(vp, offset, end, advice); 5124 break; 5125 } 5126 out: 5127 if (fp != NULL) 5128 fdrop(fp, td); 5129 free(new, M_FADVISE); 5130 return (error); 5131 } 5132 5133 int 5134 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 5135 { 5136 int error; 5137 5138 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 5139 uap->advice); 5140 return (kern_posix_error(td, error)); 5141 } 5142 5143 int 5144 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 5145 off_t *outoffp, size_t len, unsigned int flags) 5146 { 5147 struct file *infp, *infp1, *outfp, *outfp1; 5148 struct vnode *invp, *outvp; 5149 int error; 5150 size_t retlen; 5151 void *rl_rcookie, *rl_wcookie; 5152 off_t inoff, outoff, savinoff, savoutoff; 5153 bool foffsets_locked, foffsets_set; 5154 5155 infp = outfp = NULL; 5156 rl_rcookie = rl_wcookie = NULL; 5157 foffsets_locked = false; 5158 foffsets_set = false; 5159 error = 0; 5160 retlen = 0; 5161 5162 if ((flags & ~COPY_FILE_RANGE_USERFLAGS) != 0) { 5163 error = EINVAL; 5164 goto out; 5165 } 5166 if (len > SSIZE_MAX) 5167 /* 5168 * Although the len argument is size_t, the return argument 5169 * is ssize_t (which is signed). Therefore a size that won't 5170 * fit in ssize_t can't be returned. 5171 */ 5172 len = SSIZE_MAX; 5173 5174 /* Get the file structures for the file descriptors. */ 5175 error = fget_read(td, infd, 5176 inoffp != NULL ? &cap_pread_rights : &cap_read_rights, &infp); 5177 if (error != 0) 5178 goto out; 5179 if (infp->f_ops == &badfileops) { 5180 error = EBADF; 5181 goto out; 5182 } 5183 if (infp->f_vnode == NULL) { 5184 error = EINVAL; 5185 goto out; 5186 } 5187 error = fget_write(td, outfd, 5188 outoffp != NULL ? &cap_pwrite_rights : &cap_write_rights, &outfp); 5189 if (error != 0) 5190 goto out; 5191 if (outfp->f_ops == &badfileops) { 5192 error = EBADF; 5193 goto out; 5194 } 5195 if (outfp->f_vnode == NULL) { 5196 error = EINVAL; 5197 goto out; 5198 } 5199 5200 /* 5201 * Figure out which file offsets we're reading from and writing to. 5202 * If the offsets come from the file descriptions, we need to lock them, 5203 * and locking both offsets requires a loop to avoid deadlocks. 5204 */ 5205 infp1 = outfp1 = NULL; 5206 if (inoffp != NULL) 5207 inoff = *inoffp; 5208 else 5209 infp1 = infp; 5210 if (outoffp != NULL) 5211 outoff = *outoffp; 5212 else 5213 outfp1 = outfp; 5214 if (infp1 != NULL || outfp1 != NULL) { 5215 if (infp1 == outfp1) { 5216 /* 5217 * Overlapping ranges are not allowed. A more thorough 5218 * check appears below, but we must not lock the same 5219 * offset twice. 5220 */ 5221 error = EINVAL; 5222 goto out; 5223 } 5224 foffset_lock_pair(infp1, &inoff, outfp1, &outoff, 0); 5225 foffsets_locked = true; 5226 } else { 5227 foffsets_set = true; 5228 } 5229 savinoff = inoff; 5230 savoutoff = outoff; 5231 5232 invp = infp->f_vnode; 5233 outvp = outfp->f_vnode; 5234 /* Sanity check the f_flag bits. */ 5235 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 5236 (infp->f_flag & FREAD) == 0) { 5237 error = EBADF; 5238 goto out; 5239 } 5240 5241 /* If len == 0, just return 0. */ 5242 if (len == 0) 5243 goto out; 5244 5245 /* 5246 * Make sure that the ranges we check and lock below are valid. Note 5247 * that len is clamped to SSIZE_MAX above. 5248 */ 5249 if (inoff < 0 || outoff < 0) { 5250 error = EINVAL; 5251 goto out; 5252 } 5253 5254 /* 5255 * If infp and outfp refer to the same file, the byte ranges cannot 5256 * overlap. 5257 */ 5258 if (invp == outvp) { 5259 if ((inoff <= outoff && inoff + len > outoff) || 5260 (inoff > outoff && outoff + len > inoff)) { 5261 error = EINVAL; 5262 goto out; 5263 } 5264 rangelock_may_recurse(&invp->v_rl); 5265 } 5266 5267 /* Range lock the byte ranges for both invp and outvp. */ 5268 for (;;) { 5269 rl_wcookie = vn_rangelock_wlock(outvp, outoff, outoff + len); 5270 rl_rcookie = vn_rangelock_tryrlock(invp, inoff, inoff + len); 5271 if (rl_rcookie != NULL) 5272 break; 5273 vn_rangelock_unlock(outvp, rl_wcookie); 5274 rl_rcookie = vn_rangelock_rlock(invp, inoff, inoff + len); 5275 vn_rangelock_unlock(invp, rl_rcookie); 5276 } 5277 5278 retlen = len; 5279 error = vn_copy_file_range(invp, &inoff, outvp, &outoff, &retlen, 5280 flags, infp->f_cred, outfp->f_cred, td); 5281 out: 5282 if (rl_rcookie != NULL) 5283 vn_rangelock_unlock(invp, rl_rcookie); 5284 if (rl_wcookie != NULL) 5285 vn_rangelock_unlock(outvp, rl_wcookie); 5286 if ((foffsets_locked || foffsets_set) && 5287 (error == EINTR || error == ERESTART)) { 5288 inoff = savinoff; 5289 outoff = savoutoff; 5290 } 5291 if (foffsets_locked) { 5292 if (inoffp == NULL) 5293 foffset_unlock(infp, inoff, 0); 5294 else 5295 *inoffp = inoff; 5296 if (outoffp == NULL) 5297 foffset_unlock(outfp, outoff, 0); 5298 else 5299 *outoffp = outoff; 5300 } else if (foffsets_set) { 5301 *inoffp = inoff; 5302 *outoffp = outoff; 5303 } 5304 if (outfp != NULL) 5305 fdrop(outfp, td); 5306 if (infp != NULL) 5307 fdrop(infp, td); 5308 td->td_retval[0] = retlen; 5309 return (error); 5310 } 5311 5312 int 5313 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 5314 { 5315 off_t inoff, outoff, *inoffp, *outoffp; 5316 int error; 5317 5318 inoffp = outoffp = NULL; 5319 if (uap->inoffp != NULL) { 5320 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 5321 if (error != 0) 5322 return (error); 5323 inoffp = &inoff; 5324 } 5325 if (uap->outoffp != NULL) { 5326 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 5327 if (error != 0) 5328 return (error); 5329 outoffp = &outoff; 5330 } 5331 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 5332 outoffp, uap->len, uap->flags); 5333 if (error == 0 && uap->inoffp != NULL) 5334 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 5335 if (error == 0 && uap->outoffp != NULL) 5336 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 5337 return (error); 5338 } 5339