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