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 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include "opt_capsicum.h" 43 #include "opt_ktrace.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/capsicum.h> 50 #include <sys/disk.h> 51 #include <sys/sysent.h> 52 #include <sys/malloc.h> 53 #include <sys/mount.h> 54 #include <sys/mutex.h> 55 #include <sys/sysproto.h> 56 #include <sys/namei.h> 57 #include <sys/filedesc.h> 58 #include <sys/kernel.h> 59 #include <sys/fcntl.h> 60 #include <sys/file.h> 61 #include <sys/filio.h> 62 #include <sys/limits.h> 63 #include <sys/linker.h> 64 #include <sys/rwlock.h> 65 #include <sys/sdt.h> 66 #include <sys/stat.h> 67 #include <sys/sx.h> 68 #include <sys/unistd.h> 69 #include <sys/vnode.h> 70 #include <sys/priv.h> 71 #include <sys/proc.h> 72 #include <sys/dirent.h> 73 #include <sys/jail.h> 74 #include <sys/syscallsubr.h> 75 #include <sys/sysctl.h> 76 #ifdef KTRACE 77 #include <sys/ktrace.h> 78 #endif 79 80 #include <machine/stdarg.h> 81 82 #include <security/audit/audit.h> 83 #include <security/mac/mac_framework.h> 84 85 #include <vm/vm.h> 86 #include <vm/vm_object.h> 87 #include <vm/vm_page.h> 88 #include <vm/uma.h> 89 90 #include <fs/devfs/devfs.h> 91 92 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 93 94 static int kern_chflagsat(struct thread *td, int fd, const char *path, 95 enum uio_seg pathseg, u_long flags, int atflag); 96 static int setfflags(struct thread *td, struct vnode *, u_long); 97 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 98 static int getutimens(const struct timespec *, enum uio_seg, 99 struct timespec *, int *); 100 static int setutimes(struct thread *td, struct vnode *, 101 const struct timespec *, int, int); 102 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 103 struct thread *td); 104 static int kern_fhlinkat(struct thread *td, int fd, const char *path, 105 enum uio_seg pathseg, fhandle_t *fhp); 106 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, 107 size_t count, struct thread *td); 108 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, 109 const char *path, enum uio_seg segflag); 110 111 static uint64_t 112 at2cnpflags(u_int at_flags, u_int mask) 113 { 114 u_int64_t res; 115 116 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) != 117 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)); 118 119 res = 0; 120 at_flags &= mask; 121 if ((at_flags & AT_RESOLVE_BENEATH) != 0) 122 res |= RBENEATH; 123 if ((at_flags & AT_SYMLINK_FOLLOW) != 0) 124 res |= FOLLOW; 125 /* NOFOLLOW is pseudo flag */ 126 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) { 127 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 128 FOLLOW; 129 } 130 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0) 131 res |= EMPTYPATH; 132 return (res); 133 } 134 135 int 136 kern_sync(struct thread *td) 137 { 138 struct mount *mp, *nmp; 139 int save; 140 141 mtx_lock(&mountlist_mtx); 142 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 143 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 144 nmp = TAILQ_NEXT(mp, mnt_list); 145 continue; 146 } 147 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 148 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 149 save = curthread_pflags_set(TDP_SYNCIO); 150 vfs_periodic(mp, MNT_NOWAIT); 151 VFS_SYNC(mp, MNT_NOWAIT); 152 curthread_pflags_restore(save); 153 vn_finished_write(mp); 154 } 155 mtx_lock(&mountlist_mtx); 156 nmp = TAILQ_NEXT(mp, mnt_list); 157 vfs_unbusy(mp); 158 } 159 mtx_unlock(&mountlist_mtx); 160 return (0); 161 } 162 163 /* 164 * Sync each mounted filesystem. 165 */ 166 #ifndef _SYS_SYSPROTO_H_ 167 struct sync_args { 168 int dummy; 169 }; 170 #endif 171 /* ARGSUSED */ 172 int 173 sys_sync(struct thread *td, struct sync_args *uap) 174 { 175 176 return (kern_sync(td)); 177 } 178 179 /* 180 * Change filesystem quotas. 181 */ 182 #ifndef _SYS_SYSPROTO_H_ 183 struct quotactl_args { 184 char *path; 185 int cmd; 186 int uid; 187 caddr_t arg; 188 }; 189 #endif 190 int 191 sys_quotactl(struct thread *td, struct quotactl_args *uap) 192 { 193 struct mount *mp; 194 struct nameidata nd; 195 int error; 196 bool mp_busy; 197 198 AUDIT_ARG_CMD(uap->cmd); 199 AUDIT_ARG_UID(uap->uid); 200 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 201 return (EPERM); 202 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 203 uap->path, td); 204 if ((error = namei(&nd)) != 0) 205 return (error); 206 NDFREE(&nd, NDF_ONLY_PNBUF); 207 mp = nd.ni_vp->v_mount; 208 vfs_ref(mp); 209 vput(nd.ni_vp); 210 error = vfs_busy(mp, 0); 211 if (error != 0) { 212 vfs_rel(mp); 213 return (error); 214 } 215 mp_busy = true; 216 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, &mp_busy); 217 218 /* 219 * Since quota on/off operations typically need to open quota 220 * files, the implementation may need to unbusy the mount point 221 * before calling into namei. Otherwise, unmount might be 222 * started between two vfs_busy() invocations (first is ours, 223 * second is from mount point cross-walk code in lookup()), 224 * causing deadlock. 225 * 226 * Avoid unbusying mp if the implementation indicates it has 227 * already done so. 228 */ 229 if (mp_busy) 230 vfs_unbusy(mp); 231 vfs_rel(mp); 232 return (error); 233 } 234 235 /* 236 * Used by statfs conversion routines to scale the block size up if 237 * necessary so that all of the block counts are <= 'max_size'. Note 238 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 239 * value of 'n'. 240 */ 241 void 242 statfs_scale_blocks(struct statfs *sf, long max_size) 243 { 244 uint64_t count; 245 int shift; 246 247 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 248 249 /* 250 * Attempt to scale the block counts to give a more accurate 251 * overview to userland of the ratio of free space to used 252 * space. To do this, find the largest block count and compute 253 * a divisor that lets it fit into a signed integer <= max_size. 254 */ 255 if (sf->f_bavail < 0) 256 count = -sf->f_bavail; 257 else 258 count = sf->f_bavail; 259 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 260 if (count <= max_size) 261 return; 262 263 count >>= flsl(max_size); 264 shift = 0; 265 while (count > 0) { 266 shift++; 267 count >>=1; 268 } 269 270 sf->f_bsize <<= shift; 271 sf->f_blocks >>= shift; 272 sf->f_bfree >>= shift; 273 sf->f_bavail >>= shift; 274 } 275 276 static int 277 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 278 { 279 int error; 280 281 if (mp == NULL) 282 return (EBADF); 283 error = vfs_busy(mp, 0); 284 vfs_rel(mp); 285 if (error != 0) 286 return (error); 287 #ifdef MAC 288 error = mac_mount_check_stat(td->td_ucred, mp); 289 if (error != 0) 290 goto out; 291 #endif 292 error = VFS_STATFS(mp, buf); 293 if (error != 0) 294 goto out; 295 if (priv_check_cred_vfs_generation(td->td_ucred)) { 296 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 297 prison_enforce_statfs(td->td_ucred, mp, buf); 298 } 299 out: 300 vfs_unbusy(mp); 301 return (error); 302 } 303 304 /* 305 * Get filesystem statistics. 306 */ 307 #ifndef _SYS_SYSPROTO_H_ 308 struct statfs_args { 309 char *path; 310 struct statfs *buf; 311 }; 312 #endif 313 int 314 sys_statfs(struct thread *td, struct statfs_args *uap) 315 { 316 struct statfs *sfp; 317 int error; 318 319 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 320 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 321 if (error == 0) 322 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 323 free(sfp, M_STATFS); 324 return (error); 325 } 326 327 int 328 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg, 329 struct statfs *buf) 330 { 331 struct mount *mp; 332 struct nameidata nd; 333 int error; 334 335 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 336 error = namei(&nd); 337 if (error != 0) 338 return (error); 339 mp = vfs_ref_from_vp(nd.ni_vp); 340 NDFREE_NOTHING(&nd); 341 vrele(nd.ni_vp); 342 return (kern_do_statfs(td, mp, buf)); 343 } 344 345 /* 346 * Get filesystem statistics. 347 */ 348 #ifndef _SYS_SYSPROTO_H_ 349 struct fstatfs_args { 350 int fd; 351 struct statfs *buf; 352 }; 353 #endif 354 int 355 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 356 { 357 struct statfs *sfp; 358 int error; 359 360 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 361 error = kern_fstatfs(td, uap->fd, sfp); 362 if (error == 0) 363 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 364 free(sfp, M_STATFS); 365 return (error); 366 } 367 368 int 369 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 370 { 371 struct file *fp; 372 struct mount *mp; 373 struct vnode *vp; 374 int error; 375 376 AUDIT_ARG_FD(fd); 377 error = getvnode_path(td, fd, &cap_fstatfs_rights, &fp); 378 if (error != 0) 379 return (error); 380 vp = fp->f_vnode; 381 #ifdef AUDIT 382 if (AUDITING_TD(td)) { 383 vn_lock(vp, LK_SHARED | LK_RETRY); 384 AUDIT_ARG_VNODE1(vp); 385 VOP_UNLOCK(vp); 386 } 387 #endif 388 mp = vfs_ref_from_vp(vp); 389 fdrop(fp, td); 390 return (kern_do_statfs(td, mp, buf)); 391 } 392 393 /* 394 * Get statistics on all filesystems. 395 */ 396 #ifndef _SYS_SYSPROTO_H_ 397 struct getfsstat_args { 398 struct statfs *buf; 399 long bufsize; 400 int mode; 401 }; 402 #endif 403 int 404 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 405 { 406 size_t count; 407 int error; 408 409 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 410 return (EINVAL); 411 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 412 UIO_USERSPACE, uap->mode); 413 if (error == 0) 414 td->td_retval[0] = count; 415 return (error); 416 } 417 418 /* 419 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 420 * The caller is responsible for freeing memory which will be allocated 421 * in '*buf'. 422 */ 423 int 424 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 425 size_t *countp, enum uio_seg bufseg, int mode) 426 { 427 struct mount *mp, *nmp; 428 struct statfs *sfsp, *sp, *sptmp, *tofree; 429 size_t count, maxcount; 430 int error; 431 432 switch (mode) { 433 case MNT_WAIT: 434 case MNT_NOWAIT: 435 break; 436 default: 437 if (bufseg == UIO_SYSSPACE) 438 *buf = NULL; 439 return (EINVAL); 440 } 441 restart: 442 maxcount = bufsize / sizeof(struct statfs); 443 if (bufsize == 0) { 444 sfsp = NULL; 445 tofree = NULL; 446 } else if (bufseg == UIO_USERSPACE) { 447 sfsp = *buf; 448 tofree = NULL; 449 } else /* if (bufseg == UIO_SYSSPACE) */ { 450 count = 0; 451 mtx_lock(&mountlist_mtx); 452 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 453 count++; 454 } 455 mtx_unlock(&mountlist_mtx); 456 if (maxcount > count) 457 maxcount = count; 458 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 459 M_STATFS, M_WAITOK); 460 } 461 462 count = 0; 463 464 /* 465 * If there is no target buffer they only want the count. 466 * 467 * This could be TAILQ_FOREACH but it is open-coded to match the original 468 * code below. 469 */ 470 if (sfsp == NULL) { 471 mtx_lock(&mountlist_mtx); 472 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 473 if (prison_canseemount(td->td_ucred, mp) != 0) { 474 nmp = TAILQ_NEXT(mp, mnt_list); 475 continue; 476 } 477 #ifdef MAC 478 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 479 nmp = TAILQ_NEXT(mp, mnt_list); 480 continue; 481 } 482 #endif 483 count++; 484 nmp = TAILQ_NEXT(mp, mnt_list); 485 } 486 mtx_unlock(&mountlist_mtx); 487 *countp = count; 488 return (0); 489 } 490 491 /* 492 * They want the entire thing. 493 * 494 * Short-circuit the corner case of no room for anything, avoids 495 * relocking below. 496 */ 497 if (maxcount < 1) { 498 goto out; 499 } 500 501 mtx_lock(&mountlist_mtx); 502 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 503 if (prison_canseemount(td->td_ucred, mp) != 0) { 504 nmp = TAILQ_NEXT(mp, mnt_list); 505 continue; 506 } 507 #ifdef MAC 508 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 509 nmp = TAILQ_NEXT(mp, mnt_list); 510 continue; 511 } 512 #endif 513 if (mode == MNT_WAIT) { 514 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 515 /* 516 * If vfs_busy() failed, and MBF_NOWAIT 517 * wasn't passed, then the mp is gone. 518 * Furthermore, because of MBF_MNTLSTLOCK, 519 * the mountlist_mtx was dropped. We have 520 * no other choice than to start over. 521 */ 522 mtx_unlock(&mountlist_mtx); 523 free(tofree, M_STATFS); 524 goto restart; 525 } 526 } else { 527 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 528 nmp = TAILQ_NEXT(mp, mnt_list); 529 continue; 530 } 531 } 532 sp = &mp->mnt_stat; 533 /* 534 * If MNT_NOWAIT is specified, do not refresh 535 * the fsstat cache. 536 */ 537 if (mode != MNT_NOWAIT) { 538 error = VFS_STATFS(mp, sp); 539 if (error != 0) { 540 mtx_lock(&mountlist_mtx); 541 nmp = TAILQ_NEXT(mp, mnt_list); 542 vfs_unbusy(mp); 543 continue; 544 } 545 } 546 if (priv_check_cred_vfs_generation(td->td_ucred)) { 547 sptmp = malloc(sizeof(struct statfs), M_STATFS, 548 M_WAITOK); 549 *sptmp = *sp; 550 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 551 prison_enforce_statfs(td->td_ucred, mp, sptmp); 552 sp = sptmp; 553 } else 554 sptmp = NULL; 555 if (bufseg == UIO_SYSSPACE) { 556 bcopy(sp, sfsp, sizeof(*sp)); 557 free(sptmp, M_STATFS); 558 } else /* if (bufseg == UIO_USERSPACE) */ { 559 error = copyout(sp, sfsp, sizeof(*sp)); 560 free(sptmp, M_STATFS); 561 if (error != 0) { 562 vfs_unbusy(mp); 563 return (error); 564 } 565 } 566 sfsp++; 567 count++; 568 569 if (count == maxcount) { 570 vfs_unbusy(mp); 571 goto out; 572 } 573 574 mtx_lock(&mountlist_mtx); 575 nmp = TAILQ_NEXT(mp, mnt_list); 576 vfs_unbusy(mp); 577 } 578 mtx_unlock(&mountlist_mtx); 579 out: 580 *countp = count; 581 return (0); 582 } 583 584 #ifdef COMPAT_FREEBSD4 585 /* 586 * Get old format filesystem statistics. 587 */ 588 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 589 590 #ifndef _SYS_SYSPROTO_H_ 591 struct freebsd4_statfs_args { 592 char *path; 593 struct ostatfs *buf; 594 }; 595 #endif 596 int 597 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 598 { 599 struct ostatfs osb; 600 struct statfs *sfp; 601 int error; 602 603 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 604 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 605 if (error == 0) { 606 freebsd4_cvtstatfs(sfp, &osb); 607 error = copyout(&osb, uap->buf, sizeof(osb)); 608 } 609 free(sfp, M_STATFS); 610 return (error); 611 } 612 613 /* 614 * Get filesystem statistics. 615 */ 616 #ifndef _SYS_SYSPROTO_H_ 617 struct freebsd4_fstatfs_args { 618 int fd; 619 struct ostatfs *buf; 620 }; 621 #endif 622 int 623 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 624 { 625 struct ostatfs osb; 626 struct statfs *sfp; 627 int error; 628 629 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 630 error = kern_fstatfs(td, uap->fd, sfp); 631 if (error == 0) { 632 freebsd4_cvtstatfs(sfp, &osb); 633 error = copyout(&osb, uap->buf, sizeof(osb)); 634 } 635 free(sfp, M_STATFS); 636 return (error); 637 } 638 639 /* 640 * Get statistics on all filesystems. 641 */ 642 #ifndef _SYS_SYSPROTO_H_ 643 struct freebsd4_getfsstat_args { 644 struct ostatfs *buf; 645 long bufsize; 646 int mode; 647 }; 648 #endif 649 int 650 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 651 { 652 struct statfs *buf, *sp; 653 struct ostatfs osb; 654 size_t count, size; 655 int error; 656 657 if (uap->bufsize < 0) 658 return (EINVAL); 659 count = uap->bufsize / sizeof(struct ostatfs); 660 if (count > SIZE_MAX / sizeof(struct statfs)) 661 return (EINVAL); 662 size = count * sizeof(struct statfs); 663 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 664 uap->mode); 665 if (error == 0) 666 td->td_retval[0] = count; 667 if (size != 0) { 668 sp = buf; 669 while (count != 0 && error == 0) { 670 freebsd4_cvtstatfs(sp, &osb); 671 error = copyout(&osb, uap->buf, sizeof(osb)); 672 sp++; 673 uap->buf++; 674 count--; 675 } 676 free(buf, M_STATFS); 677 } 678 return (error); 679 } 680 681 /* 682 * Implement fstatfs() for (NFS) file handles. 683 */ 684 #ifndef _SYS_SYSPROTO_H_ 685 struct freebsd4_fhstatfs_args { 686 struct fhandle *u_fhp; 687 struct ostatfs *buf; 688 }; 689 #endif 690 int 691 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 692 { 693 struct ostatfs osb; 694 struct statfs *sfp; 695 fhandle_t fh; 696 int error; 697 698 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 699 if (error != 0) 700 return (error); 701 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 702 error = kern_fhstatfs(td, fh, sfp); 703 if (error == 0) { 704 freebsd4_cvtstatfs(sfp, &osb); 705 error = copyout(&osb, uap->buf, sizeof(osb)); 706 } 707 free(sfp, M_STATFS); 708 return (error); 709 } 710 711 /* 712 * Convert a new format statfs structure to an old format statfs structure. 713 */ 714 static void 715 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 716 { 717 718 statfs_scale_blocks(nsp, LONG_MAX); 719 bzero(osp, sizeof(*osp)); 720 osp->f_bsize = nsp->f_bsize; 721 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 722 osp->f_blocks = nsp->f_blocks; 723 osp->f_bfree = nsp->f_bfree; 724 osp->f_bavail = nsp->f_bavail; 725 osp->f_files = MIN(nsp->f_files, LONG_MAX); 726 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 727 osp->f_owner = nsp->f_owner; 728 osp->f_type = nsp->f_type; 729 osp->f_flags = nsp->f_flags; 730 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 731 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 732 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 733 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 734 strlcpy(osp->f_fstypename, nsp->f_fstypename, 735 MIN(MFSNAMELEN, OMFSNAMELEN)); 736 strlcpy(osp->f_mntonname, nsp->f_mntonname, 737 MIN(MNAMELEN, OMNAMELEN)); 738 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 739 MIN(MNAMELEN, OMNAMELEN)); 740 osp->f_fsid = nsp->f_fsid; 741 } 742 #endif /* COMPAT_FREEBSD4 */ 743 744 #if defined(COMPAT_FREEBSD11) 745 /* 746 * Get old format filesystem statistics. 747 */ 748 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 749 750 int 751 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 752 { 753 struct freebsd11_statfs osb; 754 struct statfs *sfp; 755 int error; 756 757 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 758 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 759 if (error == 0) { 760 freebsd11_cvtstatfs(sfp, &osb); 761 error = copyout(&osb, uap->buf, sizeof(osb)); 762 } 763 free(sfp, M_STATFS); 764 return (error); 765 } 766 767 /* 768 * Get filesystem statistics. 769 */ 770 int 771 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 772 { 773 struct freebsd11_statfs osb; 774 struct statfs *sfp; 775 int error; 776 777 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 778 error = kern_fstatfs(td, uap->fd, sfp); 779 if (error == 0) { 780 freebsd11_cvtstatfs(sfp, &osb); 781 error = copyout(&osb, uap->buf, sizeof(osb)); 782 } 783 free(sfp, M_STATFS); 784 return (error); 785 } 786 787 /* 788 * Get statistics on all filesystems. 789 */ 790 int 791 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 792 { 793 struct freebsd11_statfs osb; 794 struct statfs *buf, *sp; 795 size_t count, size; 796 int error; 797 798 count = uap->bufsize / sizeof(struct ostatfs); 799 size = count * sizeof(struct statfs); 800 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 801 uap->mode); 802 if (error == 0) 803 td->td_retval[0] = count; 804 if (size > 0) { 805 sp = buf; 806 while (count > 0 && error == 0) { 807 freebsd11_cvtstatfs(sp, &osb); 808 error = copyout(&osb, uap->buf, sizeof(osb)); 809 sp++; 810 uap->buf++; 811 count--; 812 } 813 free(buf, M_STATFS); 814 } 815 return (error); 816 } 817 818 /* 819 * Implement fstatfs() for (NFS) file handles. 820 */ 821 int 822 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 823 { 824 struct freebsd11_statfs osb; 825 struct statfs *sfp; 826 fhandle_t fh; 827 int error; 828 829 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 830 if (error) 831 return (error); 832 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 833 error = kern_fhstatfs(td, fh, sfp); 834 if (error == 0) { 835 freebsd11_cvtstatfs(sfp, &osb); 836 error = copyout(&osb, uap->buf, sizeof(osb)); 837 } 838 free(sfp, M_STATFS); 839 return (error); 840 } 841 842 /* 843 * Convert a new format statfs structure to an old format statfs structure. 844 */ 845 static void 846 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 847 { 848 849 bzero(osp, sizeof(*osp)); 850 osp->f_version = FREEBSD11_STATFS_VERSION; 851 osp->f_type = nsp->f_type; 852 osp->f_flags = nsp->f_flags; 853 osp->f_bsize = nsp->f_bsize; 854 osp->f_iosize = nsp->f_iosize; 855 osp->f_blocks = nsp->f_blocks; 856 osp->f_bfree = nsp->f_bfree; 857 osp->f_bavail = nsp->f_bavail; 858 osp->f_files = nsp->f_files; 859 osp->f_ffree = nsp->f_ffree; 860 osp->f_syncwrites = nsp->f_syncwrites; 861 osp->f_asyncwrites = nsp->f_asyncwrites; 862 osp->f_syncreads = nsp->f_syncreads; 863 osp->f_asyncreads = nsp->f_asyncreads; 864 osp->f_namemax = nsp->f_namemax; 865 osp->f_owner = nsp->f_owner; 866 osp->f_fsid = nsp->f_fsid; 867 strlcpy(osp->f_fstypename, nsp->f_fstypename, 868 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 869 strlcpy(osp->f_mntonname, nsp->f_mntonname, 870 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 871 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 872 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 873 } 874 #endif /* COMPAT_FREEBSD11 */ 875 876 /* 877 * Change current working directory to a given file descriptor. 878 */ 879 #ifndef _SYS_SYSPROTO_H_ 880 struct fchdir_args { 881 int fd; 882 }; 883 #endif 884 int 885 sys_fchdir(struct thread *td, struct fchdir_args *uap) 886 { 887 struct vnode *vp, *tdp; 888 struct mount *mp; 889 struct file *fp; 890 int error; 891 892 AUDIT_ARG_FD(uap->fd); 893 error = getvnode_path(td, uap->fd, &cap_fchdir_rights, 894 &fp); 895 if (error != 0) 896 return (error); 897 vp = fp->f_vnode; 898 vref(vp); 899 fdrop(fp, td); 900 vn_lock(vp, LK_SHARED | LK_RETRY); 901 AUDIT_ARG_VNODE1(vp); 902 error = change_dir(vp, td); 903 while (!error && (mp = vp->v_mountedhere) != NULL) { 904 if (vfs_busy(mp, 0)) 905 continue; 906 error = VFS_ROOT(mp, LK_SHARED, &tdp); 907 vfs_unbusy(mp); 908 if (error != 0) 909 break; 910 vput(vp); 911 vp = tdp; 912 } 913 if (error != 0) { 914 vput(vp); 915 return (error); 916 } 917 VOP_UNLOCK(vp); 918 pwd_chdir(td, vp); 919 return (0); 920 } 921 922 /* 923 * Change current working directory (``.''). 924 */ 925 #ifndef _SYS_SYSPROTO_H_ 926 struct chdir_args { 927 char *path; 928 }; 929 #endif 930 int 931 sys_chdir(struct thread *td, struct chdir_args *uap) 932 { 933 934 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 935 } 936 937 int 938 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg) 939 { 940 struct nameidata nd; 941 int error; 942 943 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 944 pathseg, path, td); 945 if ((error = namei(&nd)) != 0) 946 return (error); 947 if ((error = change_dir(nd.ni_vp, td)) != 0) { 948 vput(nd.ni_vp); 949 NDFREE_NOTHING(&nd); 950 return (error); 951 } 952 VOP_UNLOCK(nd.ni_vp); 953 NDFREE_NOTHING(&nd); 954 pwd_chdir(td, nd.ni_vp); 955 return (0); 956 } 957 958 /* 959 * Change notion of root (``/'') directory. 960 */ 961 #ifndef _SYS_SYSPROTO_H_ 962 struct chroot_args { 963 char *path; 964 }; 965 #endif 966 int 967 sys_chroot(struct thread *td, struct chroot_args *uap) 968 { 969 struct nameidata nd; 970 int error; 971 972 error = priv_check(td, PRIV_VFS_CHROOT); 973 if (error != 0) 974 return (error); 975 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 976 UIO_USERSPACE, uap->path, td); 977 error = namei(&nd); 978 if (error != 0) 979 goto error; 980 error = change_dir(nd.ni_vp, td); 981 if (error != 0) 982 goto e_vunlock; 983 #ifdef MAC 984 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 985 if (error != 0) 986 goto e_vunlock; 987 #endif 988 VOP_UNLOCK(nd.ni_vp); 989 error = pwd_chroot(td, nd.ni_vp); 990 vrele(nd.ni_vp); 991 NDFREE_NOTHING(&nd); 992 return (error); 993 e_vunlock: 994 vput(nd.ni_vp); 995 error: 996 NDFREE_NOTHING(&nd); 997 return (error); 998 } 999 1000 /* 1001 * Common routine for chroot and chdir. Callers must provide a locked vnode 1002 * instance. 1003 */ 1004 int 1005 change_dir(struct vnode *vp, struct thread *td) 1006 { 1007 #ifdef MAC 1008 int error; 1009 #endif 1010 1011 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 1012 if (vp->v_type != VDIR) 1013 return (ENOTDIR); 1014 #ifdef MAC 1015 error = mac_vnode_check_chdir(td->td_ucred, vp); 1016 if (error != 0) 1017 return (error); 1018 #endif 1019 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 1020 } 1021 1022 static __inline void 1023 flags_to_rights(int flags, cap_rights_t *rightsp) 1024 { 1025 if (flags & O_EXEC) { 1026 cap_rights_set_one(rightsp, CAP_FEXECVE); 1027 if (flags & O_PATH) 1028 return; 1029 } else { 1030 switch ((flags & O_ACCMODE)) { 1031 case O_RDONLY: 1032 cap_rights_set_one(rightsp, CAP_READ); 1033 break; 1034 case O_RDWR: 1035 cap_rights_set_one(rightsp, CAP_READ); 1036 /* FALLTHROUGH */ 1037 case O_WRONLY: 1038 cap_rights_set_one(rightsp, CAP_WRITE); 1039 if (!(flags & (O_APPEND | O_TRUNC))) 1040 cap_rights_set_one(rightsp, CAP_SEEK); 1041 break; 1042 } 1043 } 1044 1045 if (flags & O_CREAT) 1046 cap_rights_set_one(rightsp, CAP_CREATE); 1047 1048 if (flags & O_TRUNC) 1049 cap_rights_set_one(rightsp, CAP_FTRUNCATE); 1050 1051 if (flags & (O_SYNC | O_FSYNC)) 1052 cap_rights_set_one(rightsp, CAP_FSYNC); 1053 1054 if (flags & (O_EXLOCK | O_SHLOCK)) 1055 cap_rights_set_one(rightsp, CAP_FLOCK); 1056 } 1057 1058 /* 1059 * Check permissions, allocate an open file structure, and call the device 1060 * open routine if any. 1061 */ 1062 #ifndef _SYS_SYSPROTO_H_ 1063 struct open_args { 1064 char *path; 1065 int flags; 1066 int mode; 1067 }; 1068 #endif 1069 int 1070 sys_open(struct thread *td, struct open_args *uap) 1071 { 1072 1073 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1074 uap->flags, uap->mode)); 1075 } 1076 1077 #ifndef _SYS_SYSPROTO_H_ 1078 struct openat_args { 1079 int fd; 1080 char *path; 1081 int flag; 1082 int mode; 1083 }; 1084 #endif 1085 int 1086 sys_openat(struct thread *td, struct openat_args *uap) 1087 { 1088 1089 AUDIT_ARG_FD(uap->fd); 1090 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1091 uap->mode)); 1092 } 1093 1094 int 1095 kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1096 int flags, int mode) 1097 { 1098 struct proc *p = td->td_proc; 1099 struct filedesc *fdp; 1100 struct pwddesc *pdp; 1101 struct file *fp; 1102 struct vnode *vp; 1103 struct nameidata nd; 1104 cap_rights_t rights; 1105 int cmode, error, indx; 1106 1107 indx = -1; 1108 fdp = p->p_fd; 1109 pdp = p->p_pd; 1110 1111 AUDIT_ARG_FFLAGS(flags); 1112 AUDIT_ARG_MODE(mode); 1113 cap_rights_init_one(&rights, CAP_LOOKUP); 1114 flags_to_rights(flags, &rights); 1115 1116 /* 1117 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1118 * may be specified. On the other hand, for O_PATH any mode 1119 * except O_EXEC is ignored. 1120 */ 1121 if ((flags & O_PATH) != 0) { 1122 flags &= ~(O_CREAT | O_ACCMODE); 1123 } else if ((flags & O_EXEC) != 0) { 1124 if (flags & O_ACCMODE) 1125 return (EINVAL); 1126 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1127 return (EINVAL); 1128 } else { 1129 flags = FFLAGS(flags); 1130 } 1131 1132 /* 1133 * Allocate a file structure. The descriptor to reference it 1134 * is allocated and used by finstall_refed() below. 1135 */ 1136 error = falloc_noinstall(td, &fp); 1137 if (error != 0) 1138 return (error); 1139 /* Set the flags early so the finit in devfs can pick them up. */ 1140 fp->f_flag = flags & FMASK; 1141 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT; 1142 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1143 &rights, td); 1144 td->td_dupfd = -1; /* XXX check for fdopen */ 1145 error = vn_open(&nd, &flags, cmode, fp); 1146 if (error != 0) { 1147 /* 1148 * If the vn_open replaced the method vector, something 1149 * wonderous happened deep below and we just pass it up 1150 * pretending we know what we do. 1151 */ 1152 if (error == ENXIO && fp->f_ops != &badfileops) { 1153 MPASS((flags & O_PATH) == 0); 1154 goto success; 1155 } 1156 1157 /* 1158 * Handle special fdopen() case. bleh. 1159 * 1160 * Don't do this for relative (capability) lookups; we don't 1161 * understand exactly what would happen, and we don't think 1162 * that it ever should. 1163 */ 1164 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 && 1165 (error == ENODEV || error == ENXIO) && 1166 td->td_dupfd >= 0) { 1167 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1168 &indx); 1169 if (error == 0) 1170 goto success; 1171 } 1172 1173 goto bad; 1174 } 1175 td->td_dupfd = 0; 1176 NDFREE(&nd, NDF_ONLY_PNBUF); 1177 vp = nd.ni_vp; 1178 1179 /* 1180 * Store the vnode, for any f_type. Typically, the vnode use 1181 * count is decremented by direct call to vn_closefile() for 1182 * files that switched type in the cdevsw fdopen() method. 1183 */ 1184 fp->f_vnode = vp; 1185 1186 /* 1187 * If the file wasn't claimed by devfs bind it to the normal 1188 * vnode operations here. 1189 */ 1190 if (fp->f_ops == &badfileops) { 1191 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0, 1192 ("Unexpected fifo fp %p vp %p", fp, vp)); 1193 if ((flags & O_PATH) != 0) { 1194 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED), 1195 DTYPE_VNODE, NULL, &path_fileops); 1196 vhold(vp); 1197 vunref(vp); 1198 } else { 1199 finit_vnode(fp, flags, NULL, &vnops); 1200 } 1201 } 1202 1203 VOP_UNLOCK(vp); 1204 if (flags & O_TRUNC) { 1205 error = fo_truncate(fp, 0, td->td_ucred, td); 1206 if (error != 0) 1207 goto bad; 1208 } 1209 success: 1210 /* 1211 * If we haven't already installed the FD (for dupfdopen), do so now. 1212 */ 1213 if (indx == -1) { 1214 struct filecaps *fcaps; 1215 1216 #ifdef CAPABILITIES 1217 if ((nd.ni_resflags & NIRES_STRICTREL) != 0) 1218 fcaps = &nd.ni_filecaps; 1219 else 1220 #endif 1221 fcaps = NULL; 1222 error = finstall_refed(td, fp, &indx, flags, fcaps); 1223 /* On success finstall_refed() consumes fcaps. */ 1224 if (error != 0) { 1225 filecaps_free(&nd.ni_filecaps); 1226 goto bad; 1227 } 1228 } else { 1229 filecaps_free(&nd.ni_filecaps); 1230 falloc_abort(td, fp); 1231 } 1232 1233 td->td_retval[0] = indx; 1234 return (0); 1235 bad: 1236 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1237 falloc_abort(td, fp); 1238 return (error); 1239 } 1240 1241 #ifdef COMPAT_43 1242 /* 1243 * Create a file. 1244 */ 1245 #ifndef _SYS_SYSPROTO_H_ 1246 struct ocreat_args { 1247 char *path; 1248 int mode; 1249 }; 1250 #endif 1251 int 1252 ocreat(struct thread *td, struct ocreat_args *uap) 1253 { 1254 1255 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1256 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1257 } 1258 #endif /* COMPAT_43 */ 1259 1260 /* 1261 * Create a special file. 1262 */ 1263 #ifndef _SYS_SYSPROTO_H_ 1264 struct mknodat_args { 1265 int fd; 1266 char *path; 1267 mode_t mode; 1268 dev_t dev; 1269 }; 1270 #endif 1271 int 1272 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1273 { 1274 1275 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1276 uap->dev)); 1277 } 1278 1279 #if defined(COMPAT_FREEBSD11) 1280 int 1281 freebsd11_mknod(struct thread *td, 1282 struct freebsd11_mknod_args *uap) 1283 { 1284 1285 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1286 uap->mode, uap->dev)); 1287 } 1288 1289 int 1290 freebsd11_mknodat(struct thread *td, 1291 struct freebsd11_mknodat_args *uap) 1292 { 1293 1294 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1295 uap->dev)); 1296 } 1297 #endif /* COMPAT_FREEBSD11 */ 1298 1299 int 1300 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1301 int mode, dev_t dev) 1302 { 1303 struct vnode *vp; 1304 struct mount *mp; 1305 struct vattr vattr; 1306 struct nameidata nd; 1307 int error, whiteout = 0; 1308 1309 AUDIT_ARG_MODE(mode); 1310 AUDIT_ARG_DEV(dev); 1311 switch (mode & S_IFMT) { 1312 case S_IFCHR: 1313 case S_IFBLK: 1314 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1315 if (error == 0 && dev == VNOVAL) 1316 error = EINVAL; 1317 break; 1318 case S_IFWHT: 1319 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1320 break; 1321 case S_IFIFO: 1322 if (dev == 0) 1323 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1324 /* FALLTHROUGH */ 1325 default: 1326 error = EINVAL; 1327 break; 1328 } 1329 if (error != 0) 1330 return (error); 1331 NDPREINIT(&nd); 1332 restart: 1333 bwillwrite(); 1334 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1335 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1336 td); 1337 if ((error = namei(&nd)) != 0) 1338 return (error); 1339 vp = nd.ni_vp; 1340 if (vp != NULL) { 1341 NDFREE(&nd, NDF_ONLY_PNBUF); 1342 if (vp == nd.ni_dvp) 1343 vrele(nd.ni_dvp); 1344 else 1345 vput(nd.ni_dvp); 1346 vrele(vp); 1347 return (EEXIST); 1348 } else { 1349 VATTR_NULL(&vattr); 1350 vattr.va_mode = (mode & ALLPERMS) & 1351 ~td->td_proc->p_pd->pd_cmask; 1352 vattr.va_rdev = dev; 1353 whiteout = 0; 1354 1355 switch (mode & S_IFMT) { 1356 case S_IFCHR: 1357 vattr.va_type = VCHR; 1358 break; 1359 case S_IFBLK: 1360 vattr.va_type = VBLK; 1361 break; 1362 case S_IFWHT: 1363 whiteout = 1; 1364 break; 1365 default: 1366 panic("kern_mknod: invalid mode"); 1367 } 1368 } 1369 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1370 NDFREE(&nd, NDF_ONLY_PNBUF); 1371 vput(nd.ni_dvp); 1372 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1373 return (error); 1374 goto restart; 1375 } 1376 #ifdef MAC 1377 if (error == 0 && !whiteout) 1378 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1379 &nd.ni_cnd, &vattr); 1380 #endif 1381 if (error == 0) { 1382 if (whiteout) 1383 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1384 else { 1385 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1386 &nd.ni_cnd, &vattr); 1387 } 1388 } 1389 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL, 1390 true); 1391 vn_finished_write(mp); 1392 NDFREE(&nd, NDF_ONLY_PNBUF); 1393 if (error == ERELOOKUP) 1394 goto restart; 1395 return (error); 1396 } 1397 1398 /* 1399 * Create a named pipe. 1400 */ 1401 #ifndef _SYS_SYSPROTO_H_ 1402 struct mkfifo_args { 1403 char *path; 1404 int mode; 1405 }; 1406 #endif 1407 int 1408 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1409 { 1410 1411 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1412 uap->mode)); 1413 } 1414 1415 #ifndef _SYS_SYSPROTO_H_ 1416 struct mkfifoat_args { 1417 int fd; 1418 char *path; 1419 mode_t mode; 1420 }; 1421 #endif 1422 int 1423 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1424 { 1425 1426 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1427 uap->mode)); 1428 } 1429 1430 int 1431 kern_mkfifoat(struct thread *td, int fd, const char *path, 1432 enum uio_seg pathseg, int mode) 1433 { 1434 struct mount *mp; 1435 struct vattr vattr; 1436 struct nameidata nd; 1437 int error; 1438 1439 AUDIT_ARG_MODE(mode); 1440 NDPREINIT(&nd); 1441 restart: 1442 bwillwrite(); 1443 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1444 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1445 td); 1446 if ((error = namei(&nd)) != 0) 1447 return (error); 1448 if (nd.ni_vp != NULL) { 1449 NDFREE(&nd, NDF_ONLY_PNBUF); 1450 if (nd.ni_vp == nd.ni_dvp) 1451 vrele(nd.ni_dvp); 1452 else 1453 vput(nd.ni_dvp); 1454 vrele(nd.ni_vp); 1455 return (EEXIST); 1456 } 1457 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1458 NDFREE(&nd, NDF_ONLY_PNBUF); 1459 vput(nd.ni_dvp); 1460 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1461 return (error); 1462 goto restart; 1463 } 1464 VATTR_NULL(&vattr); 1465 vattr.va_type = VFIFO; 1466 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask; 1467 #ifdef MAC 1468 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1469 &vattr); 1470 if (error != 0) 1471 goto out; 1472 #endif 1473 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1474 #ifdef MAC 1475 out: 1476 #endif 1477 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1478 vn_finished_write(mp); 1479 NDFREE(&nd, NDF_ONLY_PNBUF); 1480 if (error == ERELOOKUP) 1481 goto restart; 1482 return (error); 1483 } 1484 1485 /* 1486 * Make a hard file link. 1487 */ 1488 #ifndef _SYS_SYSPROTO_H_ 1489 struct link_args { 1490 char *path; 1491 char *link; 1492 }; 1493 #endif 1494 int 1495 sys_link(struct thread *td, struct link_args *uap) 1496 { 1497 1498 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1499 UIO_USERSPACE, AT_SYMLINK_FOLLOW)); 1500 } 1501 1502 #ifndef _SYS_SYSPROTO_H_ 1503 struct linkat_args { 1504 int fd1; 1505 char *path1; 1506 int fd2; 1507 char *path2; 1508 int flag; 1509 }; 1510 #endif 1511 int 1512 sys_linkat(struct thread *td, struct linkat_args *uap) 1513 { 1514 int flag; 1515 1516 flag = uap->flag; 1517 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | 1518 AT_EMPTY_PATH)) != 0) 1519 return (EINVAL); 1520 1521 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1522 UIO_USERSPACE, flag)); 1523 } 1524 1525 int hardlink_check_uid = 0; 1526 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1527 &hardlink_check_uid, 0, 1528 "Unprivileged processes cannot create hard links to files owned by other " 1529 "users"); 1530 static int hardlink_check_gid = 0; 1531 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1532 &hardlink_check_gid, 0, 1533 "Unprivileged processes cannot create hard links to files owned by other " 1534 "groups"); 1535 1536 static int 1537 can_hardlink(struct vnode *vp, struct ucred *cred) 1538 { 1539 struct vattr va; 1540 int error; 1541 1542 if (!hardlink_check_uid && !hardlink_check_gid) 1543 return (0); 1544 1545 error = VOP_GETATTR(vp, &va, cred); 1546 if (error != 0) 1547 return (error); 1548 1549 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1550 error = priv_check_cred(cred, PRIV_VFS_LINK); 1551 if (error != 0) 1552 return (error); 1553 } 1554 1555 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1556 error = priv_check_cred(cred, PRIV_VFS_LINK); 1557 if (error != 0) 1558 return (error); 1559 } 1560 1561 return (0); 1562 } 1563 1564 int 1565 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1566 const char *path2, enum uio_seg segflag, int flag) 1567 { 1568 struct nameidata nd; 1569 int error; 1570 1571 NDPREINIT(&nd); 1572 do { 1573 bwillwrite(); 1574 NDINIT_ATRIGHTS(&nd, LOOKUP, AUDITVNODE1 | at2cnpflags(flag, 1575 AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | AT_EMPTY_PATH), 1576 segflag, path1, fd1, &cap_linkat_source_rights, td); 1577 if ((error = namei(&nd)) != 0) 1578 return (error); 1579 NDFREE(&nd, NDF_ONLY_PNBUF); 1580 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) { 1581 error = priv_check(td, PRIV_VFS_FHOPEN); 1582 if (error != 0) { 1583 vrele(nd.ni_vp); 1584 return (error); 1585 } 1586 } 1587 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1588 } while (error == EAGAIN || error == ERELOOKUP); 1589 return (error); 1590 } 1591 1592 static int 1593 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1594 enum uio_seg segflag) 1595 { 1596 struct nameidata nd; 1597 struct mount *mp; 1598 int error; 1599 1600 if (vp->v_type == VDIR) { 1601 vrele(vp); 1602 return (EPERM); /* POSIX */ 1603 } 1604 NDINIT_ATRIGHTS(&nd, CREATE, 1605 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1606 &cap_linkat_target_rights, td); 1607 if ((error = namei(&nd)) == 0) { 1608 if (nd.ni_vp != NULL) { 1609 NDFREE(&nd, NDF_ONLY_PNBUF); 1610 if (nd.ni_dvp == nd.ni_vp) 1611 vrele(nd.ni_dvp); 1612 else 1613 vput(nd.ni_dvp); 1614 vrele(nd.ni_vp); 1615 vrele(vp); 1616 return (EEXIST); 1617 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1618 /* 1619 * Cross-device link. No need to recheck 1620 * vp->v_type, since it cannot change, except 1621 * to VBAD. 1622 */ 1623 NDFREE(&nd, NDF_ONLY_PNBUF); 1624 vput(nd.ni_dvp); 1625 vrele(vp); 1626 return (EXDEV); 1627 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1628 error = can_hardlink(vp, td->td_ucred); 1629 #ifdef MAC 1630 if (error == 0) 1631 error = mac_vnode_check_link(td->td_ucred, 1632 nd.ni_dvp, vp, &nd.ni_cnd); 1633 #endif 1634 if (error != 0) { 1635 vput(vp); 1636 vput(nd.ni_dvp); 1637 NDFREE(&nd, NDF_ONLY_PNBUF); 1638 return (error); 1639 } 1640 error = vn_start_write(vp, &mp, V_NOWAIT); 1641 if (error != 0) { 1642 vput(vp); 1643 vput(nd.ni_dvp); 1644 NDFREE(&nd, NDF_ONLY_PNBUF); 1645 error = vn_start_write(NULL, &mp, 1646 V_XSLEEP | PCATCH); 1647 if (error != 0) 1648 return (error); 1649 return (EAGAIN); 1650 } 1651 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1652 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true); 1653 vn_finished_write(mp); 1654 NDFREE(&nd, NDF_ONLY_PNBUF); 1655 vp = NULL; 1656 } else { 1657 vput(nd.ni_dvp); 1658 NDFREE(&nd, NDF_ONLY_PNBUF); 1659 vrele(vp); 1660 return (EAGAIN); 1661 } 1662 } 1663 if (vp != NULL) 1664 vrele(vp); 1665 return (error); 1666 } 1667 1668 /* 1669 * Make a symbolic link. 1670 */ 1671 #ifndef _SYS_SYSPROTO_H_ 1672 struct symlink_args { 1673 char *path; 1674 char *link; 1675 }; 1676 #endif 1677 int 1678 sys_symlink(struct thread *td, struct symlink_args *uap) 1679 { 1680 1681 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1682 UIO_USERSPACE)); 1683 } 1684 1685 #ifndef _SYS_SYSPROTO_H_ 1686 struct symlinkat_args { 1687 char *path; 1688 int fd; 1689 char *path2; 1690 }; 1691 #endif 1692 int 1693 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1694 { 1695 1696 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1697 UIO_USERSPACE)); 1698 } 1699 1700 int 1701 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1702 enum uio_seg segflg) 1703 { 1704 struct mount *mp; 1705 struct vattr vattr; 1706 const char *syspath; 1707 char *tmppath; 1708 struct nameidata nd; 1709 int error; 1710 1711 if (segflg == UIO_SYSSPACE) { 1712 syspath = path1; 1713 } else { 1714 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1715 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1716 goto out; 1717 syspath = tmppath; 1718 } 1719 AUDIT_ARG_TEXT(syspath); 1720 NDPREINIT(&nd); 1721 restart: 1722 bwillwrite(); 1723 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1724 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1725 td); 1726 if ((error = namei(&nd)) != 0) 1727 goto out; 1728 if (nd.ni_vp) { 1729 NDFREE(&nd, NDF_ONLY_PNBUF); 1730 if (nd.ni_vp == nd.ni_dvp) 1731 vrele(nd.ni_dvp); 1732 else 1733 vput(nd.ni_dvp); 1734 vrele(nd.ni_vp); 1735 nd.ni_vp = NULL; 1736 error = EEXIST; 1737 goto out; 1738 } 1739 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1740 NDFREE(&nd, NDF_ONLY_PNBUF); 1741 vput(nd.ni_dvp); 1742 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1743 goto out; 1744 goto restart; 1745 } 1746 VATTR_NULL(&vattr); 1747 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask; 1748 #ifdef MAC 1749 vattr.va_type = VLNK; 1750 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1751 &vattr); 1752 if (error != 0) 1753 goto out2; 1754 #endif 1755 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1756 #ifdef MAC 1757 out2: 1758 #endif 1759 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1760 vn_finished_write(mp); 1761 NDFREE(&nd, NDF_ONLY_PNBUF); 1762 if (error == ERELOOKUP) 1763 goto restart; 1764 out: 1765 if (segflg != UIO_SYSSPACE) 1766 uma_zfree(namei_zone, tmppath); 1767 return (error); 1768 } 1769 1770 /* 1771 * Delete a whiteout from the filesystem. 1772 */ 1773 #ifndef _SYS_SYSPROTO_H_ 1774 struct undelete_args { 1775 char *path; 1776 }; 1777 #endif 1778 int 1779 sys_undelete(struct thread *td, struct undelete_args *uap) 1780 { 1781 struct mount *mp; 1782 struct nameidata nd; 1783 int error; 1784 1785 NDPREINIT(&nd); 1786 restart: 1787 bwillwrite(); 1788 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1789 UIO_USERSPACE, uap->path, td); 1790 error = namei(&nd); 1791 if (error != 0) 1792 return (error); 1793 1794 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1795 NDFREE(&nd, NDF_ONLY_PNBUF); 1796 if (nd.ni_vp == nd.ni_dvp) 1797 vrele(nd.ni_dvp); 1798 else 1799 vput(nd.ni_dvp); 1800 if (nd.ni_vp) 1801 vrele(nd.ni_vp); 1802 return (EEXIST); 1803 } 1804 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1805 NDFREE(&nd, NDF_ONLY_PNBUF); 1806 vput(nd.ni_dvp); 1807 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1808 return (error); 1809 goto restart; 1810 } 1811 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1812 NDFREE(&nd, NDF_ONLY_PNBUF); 1813 vput(nd.ni_dvp); 1814 vn_finished_write(mp); 1815 if (error == ERELOOKUP) 1816 goto restart; 1817 return (error); 1818 } 1819 1820 /* 1821 * Delete a name from the filesystem. 1822 */ 1823 #ifndef _SYS_SYSPROTO_H_ 1824 struct unlink_args { 1825 char *path; 1826 }; 1827 #endif 1828 int 1829 sys_unlink(struct thread *td, struct unlink_args *uap) 1830 { 1831 1832 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1833 0, 0)); 1834 } 1835 1836 static int 1837 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1838 int flag, enum uio_seg pathseg, ino_t oldinum) 1839 { 1840 1841 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0) 1842 return (EINVAL); 1843 1844 if ((flag & AT_REMOVEDIR) != 0) 1845 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1846 1847 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1848 } 1849 1850 #ifndef _SYS_SYSPROTO_H_ 1851 struct unlinkat_args { 1852 int fd; 1853 char *path; 1854 int flag; 1855 }; 1856 #endif 1857 int 1858 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1859 { 1860 1861 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1862 UIO_USERSPACE, 0)); 1863 } 1864 1865 #ifndef _SYS_SYSPROTO_H_ 1866 struct funlinkat_args { 1867 int dfd; 1868 const char *path; 1869 int fd; 1870 int flag; 1871 }; 1872 #endif 1873 int 1874 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 1875 { 1876 1877 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 1878 UIO_USERSPACE, 0)); 1879 } 1880 1881 int 1882 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 1883 enum uio_seg pathseg, int flag, ino_t oldinum) 1884 { 1885 struct mount *mp; 1886 struct file *fp; 1887 struct vnode *vp; 1888 struct nameidata nd; 1889 struct stat sb; 1890 int error; 1891 1892 fp = NULL; 1893 if (fd != FD_NONE) { 1894 error = getvnode_path(td, fd, &cap_no_rights, &fp); 1895 if (error != 0) 1896 return (error); 1897 } 1898 1899 NDPREINIT(&nd); 1900 restart: 1901 bwillwrite(); 1902 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1903 at2cnpflags(flag, AT_RESOLVE_BENEATH), 1904 pathseg, path, dfd, &cap_unlinkat_rights, td); 1905 if ((error = namei(&nd)) != 0) { 1906 if (error == EINVAL) 1907 error = EPERM; 1908 goto fdout; 1909 } 1910 vp = nd.ni_vp; 1911 if (vp->v_type == VDIR && oldinum == 0) { 1912 error = EPERM; /* POSIX */ 1913 } else if (oldinum != 0 && 1914 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1915 sb.st_ino != oldinum) { 1916 error = EIDRM; /* Identifier removed */ 1917 } else if (fp != NULL && fp->f_vnode != vp) { 1918 if (VN_IS_DOOMED(fp->f_vnode)) 1919 error = EBADF; 1920 else 1921 error = EDEADLK; 1922 } else { 1923 /* 1924 * The root of a mounted filesystem cannot be deleted. 1925 * 1926 * XXX: can this only be a VDIR case? 1927 */ 1928 if (vp->v_vflag & VV_ROOT) 1929 error = EBUSY; 1930 } 1931 if (error == 0) { 1932 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1933 NDFREE(&nd, NDF_ONLY_PNBUF); 1934 vput(nd.ni_dvp); 1935 if (vp == nd.ni_dvp) 1936 vrele(vp); 1937 else 1938 vput(vp); 1939 if ((error = vn_start_write(NULL, &mp, 1940 V_XSLEEP | PCATCH)) != 0) { 1941 goto fdout; 1942 } 1943 goto restart; 1944 } 1945 #ifdef MAC 1946 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1947 &nd.ni_cnd); 1948 if (error != 0) 1949 goto out; 1950 #endif 1951 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1952 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1953 #ifdef MAC 1954 out: 1955 #endif 1956 vn_finished_write(mp); 1957 } 1958 NDFREE(&nd, NDF_ONLY_PNBUF); 1959 vput(nd.ni_dvp); 1960 if (vp == nd.ni_dvp) 1961 vrele(vp); 1962 else 1963 vput(vp); 1964 if (error == ERELOOKUP) 1965 goto restart; 1966 fdout: 1967 if (fp != NULL) 1968 fdrop(fp, td); 1969 return (error); 1970 } 1971 1972 /* 1973 * Reposition read/write file offset. 1974 */ 1975 #ifndef _SYS_SYSPROTO_H_ 1976 struct lseek_args { 1977 int fd; 1978 int pad; 1979 off_t offset; 1980 int whence; 1981 }; 1982 #endif 1983 int 1984 sys_lseek(struct thread *td, struct lseek_args *uap) 1985 { 1986 1987 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1988 } 1989 1990 int 1991 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1992 { 1993 struct file *fp; 1994 int error; 1995 1996 AUDIT_ARG_FD(fd); 1997 error = fget(td, fd, &cap_seek_rights, &fp); 1998 if (error != 0) 1999 return (error); 2000 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 2001 fo_seek(fp, offset, whence, td) : ESPIPE; 2002 fdrop(fp, td); 2003 return (error); 2004 } 2005 2006 #if defined(COMPAT_43) 2007 /* 2008 * Reposition read/write file offset. 2009 */ 2010 #ifndef _SYS_SYSPROTO_H_ 2011 struct olseek_args { 2012 int fd; 2013 long offset; 2014 int whence; 2015 }; 2016 #endif 2017 int 2018 olseek(struct thread *td, struct olseek_args *uap) 2019 { 2020 2021 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2022 } 2023 #endif /* COMPAT_43 */ 2024 2025 #if defined(COMPAT_FREEBSD6) 2026 /* Version with the 'pad' argument */ 2027 int 2028 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 2029 { 2030 2031 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2032 } 2033 #endif 2034 2035 /* 2036 * Check access permissions using passed credentials. 2037 */ 2038 static int 2039 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 2040 struct thread *td) 2041 { 2042 accmode_t accmode; 2043 int error; 2044 2045 /* Flags == 0 means only check for existence. */ 2046 if (user_flags == 0) 2047 return (0); 2048 2049 accmode = 0; 2050 if (user_flags & R_OK) 2051 accmode |= VREAD; 2052 if (user_flags & W_OK) 2053 accmode |= VWRITE; 2054 if (user_flags & X_OK) 2055 accmode |= VEXEC; 2056 #ifdef MAC 2057 error = mac_vnode_check_access(cred, vp, accmode); 2058 if (error != 0) 2059 return (error); 2060 #endif 2061 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 2062 error = VOP_ACCESS(vp, accmode, cred, td); 2063 return (error); 2064 } 2065 2066 /* 2067 * Check access permissions using "real" credentials. 2068 */ 2069 #ifndef _SYS_SYSPROTO_H_ 2070 struct access_args { 2071 char *path; 2072 int amode; 2073 }; 2074 #endif 2075 int 2076 sys_access(struct thread *td, struct access_args *uap) 2077 { 2078 2079 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2080 0, uap->amode)); 2081 } 2082 2083 #ifndef _SYS_SYSPROTO_H_ 2084 struct faccessat_args { 2085 int dirfd; 2086 char *path; 2087 int amode; 2088 int flag; 2089 } 2090 #endif 2091 int 2092 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2093 { 2094 2095 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2096 uap->amode)); 2097 } 2098 2099 int 2100 kern_accessat(struct thread *td, int fd, const char *path, 2101 enum uio_seg pathseg, int flag, int amode) 2102 { 2103 struct ucred *cred, *usecred; 2104 struct vnode *vp; 2105 struct nameidata nd; 2106 int error; 2107 2108 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH)) != 0) 2109 return (EINVAL); 2110 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2111 return (EINVAL); 2112 2113 /* 2114 * Create and modify a temporary credential instead of one that 2115 * is potentially shared (if we need one). 2116 */ 2117 cred = td->td_ucred; 2118 if ((flag & AT_EACCESS) == 0 && 2119 ((cred->cr_uid != cred->cr_ruid || 2120 cred->cr_rgid != cred->cr_groups[0]))) { 2121 usecred = crdup(cred); 2122 usecred->cr_uid = cred->cr_ruid; 2123 usecred->cr_groups[0] = cred->cr_rgid; 2124 td->td_ucred = usecred; 2125 } else 2126 usecred = cred; 2127 AUDIT_ARG_VALUE(amode); 2128 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2129 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | 2130 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights, td); 2131 if ((error = namei(&nd)) != 0) 2132 goto out; 2133 vp = nd.ni_vp; 2134 2135 error = vn_access(vp, amode, usecred, td); 2136 NDFREE_NOTHING(&nd); 2137 vput(vp); 2138 out: 2139 if (usecred != cred) { 2140 td->td_ucred = cred; 2141 crfree(usecred); 2142 } 2143 return (error); 2144 } 2145 2146 /* 2147 * Check access permissions using "effective" credentials. 2148 */ 2149 #ifndef _SYS_SYSPROTO_H_ 2150 struct eaccess_args { 2151 char *path; 2152 int amode; 2153 }; 2154 #endif 2155 int 2156 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2157 { 2158 2159 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2160 AT_EACCESS, uap->amode)); 2161 } 2162 2163 #if defined(COMPAT_43) 2164 /* 2165 * Get file status; this version follows links. 2166 */ 2167 #ifndef _SYS_SYSPROTO_H_ 2168 struct ostat_args { 2169 char *path; 2170 struct ostat *ub; 2171 }; 2172 #endif 2173 int 2174 ostat(struct thread *td, struct ostat_args *uap) 2175 { 2176 struct stat sb; 2177 struct ostat osb; 2178 int error; 2179 2180 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2181 &sb, NULL); 2182 if (error != 0) 2183 return (error); 2184 cvtstat(&sb, &osb); 2185 return (copyout(&osb, uap->ub, sizeof (osb))); 2186 } 2187 2188 /* 2189 * Get file status; this version does not follow links. 2190 */ 2191 #ifndef _SYS_SYSPROTO_H_ 2192 struct olstat_args { 2193 char *path; 2194 struct ostat *ub; 2195 }; 2196 #endif 2197 int 2198 olstat(struct thread *td, struct olstat_args *uap) 2199 { 2200 struct stat sb; 2201 struct ostat osb; 2202 int error; 2203 2204 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2205 UIO_USERSPACE, &sb, NULL); 2206 if (error != 0) 2207 return (error); 2208 cvtstat(&sb, &osb); 2209 return (copyout(&osb, uap->ub, sizeof (osb))); 2210 } 2211 2212 /* 2213 * Convert from an old to a new stat structure. 2214 * XXX: many values are blindly truncated. 2215 */ 2216 void 2217 cvtstat(struct stat *st, struct ostat *ost) 2218 { 2219 2220 bzero(ost, sizeof(*ost)); 2221 ost->st_dev = st->st_dev; 2222 ost->st_ino = st->st_ino; 2223 ost->st_mode = st->st_mode; 2224 ost->st_nlink = st->st_nlink; 2225 ost->st_uid = st->st_uid; 2226 ost->st_gid = st->st_gid; 2227 ost->st_rdev = st->st_rdev; 2228 ost->st_size = MIN(st->st_size, INT32_MAX); 2229 ost->st_atim = st->st_atim; 2230 ost->st_mtim = st->st_mtim; 2231 ost->st_ctim = st->st_ctim; 2232 ost->st_blksize = st->st_blksize; 2233 ost->st_blocks = st->st_blocks; 2234 ost->st_flags = st->st_flags; 2235 ost->st_gen = st->st_gen; 2236 } 2237 #endif /* COMPAT_43 */ 2238 2239 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2240 int ino64_trunc_error; 2241 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2242 &ino64_trunc_error, 0, 2243 "Error on truncation of device, file or inode number, or link count"); 2244 2245 int 2246 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2247 { 2248 2249 ost->st_dev = st->st_dev; 2250 if (ost->st_dev != st->st_dev) { 2251 switch (ino64_trunc_error) { 2252 default: 2253 /* 2254 * Since dev_t is almost raw, don't clamp to the 2255 * maximum for case 2, but ignore the error. 2256 */ 2257 break; 2258 case 1: 2259 return (EOVERFLOW); 2260 } 2261 } 2262 ost->st_ino = st->st_ino; 2263 if (ost->st_ino != st->st_ino) { 2264 switch (ino64_trunc_error) { 2265 default: 2266 case 0: 2267 break; 2268 case 1: 2269 return (EOVERFLOW); 2270 case 2: 2271 ost->st_ino = UINT32_MAX; 2272 break; 2273 } 2274 } 2275 ost->st_mode = st->st_mode; 2276 ost->st_nlink = st->st_nlink; 2277 if (ost->st_nlink != st->st_nlink) { 2278 switch (ino64_trunc_error) { 2279 default: 2280 case 0: 2281 break; 2282 case 1: 2283 return (EOVERFLOW); 2284 case 2: 2285 ost->st_nlink = UINT16_MAX; 2286 break; 2287 } 2288 } 2289 ost->st_uid = st->st_uid; 2290 ost->st_gid = st->st_gid; 2291 ost->st_rdev = st->st_rdev; 2292 if (ost->st_rdev != st->st_rdev) { 2293 switch (ino64_trunc_error) { 2294 default: 2295 break; 2296 case 1: 2297 return (EOVERFLOW); 2298 } 2299 } 2300 ost->st_atim = st->st_atim; 2301 ost->st_mtim = st->st_mtim; 2302 ost->st_ctim = st->st_ctim; 2303 ost->st_size = st->st_size; 2304 ost->st_blocks = st->st_blocks; 2305 ost->st_blksize = st->st_blksize; 2306 ost->st_flags = st->st_flags; 2307 ost->st_gen = st->st_gen; 2308 ost->st_lspare = 0; 2309 ost->st_birthtim = st->st_birthtim; 2310 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2311 sizeof(*ost) - offsetof(struct freebsd11_stat, 2312 st_birthtim) - sizeof(ost->st_birthtim)); 2313 return (0); 2314 } 2315 2316 int 2317 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2318 { 2319 struct stat sb; 2320 struct freebsd11_stat osb; 2321 int error; 2322 2323 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2324 &sb, NULL); 2325 if (error != 0) 2326 return (error); 2327 error = freebsd11_cvtstat(&sb, &osb); 2328 if (error == 0) 2329 error = copyout(&osb, uap->ub, sizeof(osb)); 2330 return (error); 2331 } 2332 2333 int 2334 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2335 { 2336 struct stat sb; 2337 struct freebsd11_stat osb; 2338 int error; 2339 2340 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2341 UIO_USERSPACE, &sb, NULL); 2342 if (error != 0) 2343 return (error); 2344 error = freebsd11_cvtstat(&sb, &osb); 2345 if (error == 0) 2346 error = copyout(&osb, uap->ub, sizeof(osb)); 2347 return (error); 2348 } 2349 2350 int 2351 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2352 { 2353 struct fhandle fh; 2354 struct stat sb; 2355 struct freebsd11_stat osb; 2356 int error; 2357 2358 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2359 if (error != 0) 2360 return (error); 2361 error = kern_fhstat(td, fh, &sb); 2362 if (error != 0) 2363 return (error); 2364 error = freebsd11_cvtstat(&sb, &osb); 2365 if (error == 0) 2366 error = copyout(&osb, uap->sb, sizeof(osb)); 2367 return (error); 2368 } 2369 2370 int 2371 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2372 { 2373 struct stat sb; 2374 struct freebsd11_stat osb; 2375 int error; 2376 2377 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2378 UIO_USERSPACE, &sb, NULL); 2379 if (error != 0) 2380 return (error); 2381 error = freebsd11_cvtstat(&sb, &osb); 2382 if (error == 0) 2383 error = copyout(&osb, uap->buf, sizeof(osb)); 2384 return (error); 2385 } 2386 #endif /* COMPAT_FREEBSD11 */ 2387 2388 /* 2389 * Get file status 2390 */ 2391 #ifndef _SYS_SYSPROTO_H_ 2392 struct fstatat_args { 2393 int fd; 2394 char *path; 2395 struct stat *buf; 2396 int flag; 2397 } 2398 #endif 2399 int 2400 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2401 { 2402 struct stat sb; 2403 int error; 2404 2405 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2406 UIO_USERSPACE, &sb, NULL); 2407 if (error == 0) 2408 error = copyout(&sb, uap->buf, sizeof (sb)); 2409 return (error); 2410 } 2411 2412 int 2413 kern_statat(struct thread *td, int flag, int fd, const char *path, 2414 enum uio_seg pathseg, struct stat *sbp, 2415 void (*hook)(struct vnode *vp, struct stat *sbp)) 2416 { 2417 struct nameidata nd; 2418 int error; 2419 2420 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2421 AT_EMPTY_PATH)) != 0) 2422 return (EINVAL); 2423 2424 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH | 2425 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF | 2426 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, td); 2427 2428 if ((error = namei(&nd)) != 0) 2429 return (error); 2430 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED, td); 2431 if (error == 0) { 2432 if (__predict_false(hook != NULL)) 2433 hook(nd.ni_vp, sbp); 2434 } 2435 NDFREE_NOTHING(&nd); 2436 vput(nd.ni_vp); 2437 #ifdef __STAT_TIME_T_EXT 2438 sbp->st_atim_ext = 0; 2439 sbp->st_mtim_ext = 0; 2440 sbp->st_ctim_ext = 0; 2441 sbp->st_btim_ext = 0; 2442 #endif 2443 #ifdef KTRACE 2444 if (KTRPOINT(td, KTR_STRUCT)) 2445 ktrstat_error(sbp, error); 2446 #endif 2447 return (error); 2448 } 2449 2450 #if defined(COMPAT_FREEBSD11) 2451 /* 2452 * Implementation of the NetBSD [l]stat() functions. 2453 */ 2454 void 2455 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2456 { 2457 2458 bzero(nsb, sizeof(*nsb)); 2459 nsb->st_dev = sb->st_dev; 2460 nsb->st_ino = sb->st_ino; 2461 nsb->st_mode = sb->st_mode; 2462 nsb->st_nlink = sb->st_nlink; 2463 nsb->st_uid = sb->st_uid; 2464 nsb->st_gid = sb->st_gid; 2465 nsb->st_rdev = sb->st_rdev; 2466 nsb->st_atim = sb->st_atim; 2467 nsb->st_mtim = sb->st_mtim; 2468 nsb->st_ctim = sb->st_ctim; 2469 nsb->st_size = sb->st_size; 2470 nsb->st_blocks = sb->st_blocks; 2471 nsb->st_blksize = sb->st_blksize; 2472 nsb->st_flags = sb->st_flags; 2473 nsb->st_gen = sb->st_gen; 2474 nsb->st_birthtim = sb->st_birthtim; 2475 } 2476 2477 #ifndef _SYS_SYSPROTO_H_ 2478 struct freebsd11_nstat_args { 2479 char *path; 2480 struct nstat *ub; 2481 }; 2482 #endif 2483 int 2484 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2485 { 2486 struct stat sb; 2487 struct nstat nsb; 2488 int error; 2489 2490 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2491 &sb, NULL); 2492 if (error != 0) 2493 return (error); 2494 freebsd11_cvtnstat(&sb, &nsb); 2495 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2496 } 2497 2498 /* 2499 * NetBSD lstat. Get file status; this version does not follow links. 2500 */ 2501 #ifndef _SYS_SYSPROTO_H_ 2502 struct freebsd11_nlstat_args { 2503 char *path; 2504 struct nstat *ub; 2505 }; 2506 #endif 2507 int 2508 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2509 { 2510 struct stat sb; 2511 struct nstat nsb; 2512 int error; 2513 2514 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2515 UIO_USERSPACE, &sb, NULL); 2516 if (error != 0) 2517 return (error); 2518 freebsd11_cvtnstat(&sb, &nsb); 2519 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2520 } 2521 #endif /* COMPAT_FREEBSD11 */ 2522 2523 /* 2524 * Get configurable pathname variables. 2525 */ 2526 #ifndef _SYS_SYSPROTO_H_ 2527 struct pathconf_args { 2528 char *path; 2529 int name; 2530 }; 2531 #endif 2532 int 2533 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2534 { 2535 long value; 2536 int error; 2537 2538 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2539 &value); 2540 if (error == 0) 2541 td->td_retval[0] = value; 2542 return (error); 2543 } 2544 2545 #ifndef _SYS_SYSPROTO_H_ 2546 struct lpathconf_args { 2547 char *path; 2548 int name; 2549 }; 2550 #endif 2551 int 2552 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2553 { 2554 long value; 2555 int error; 2556 2557 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2558 NOFOLLOW, &value); 2559 if (error == 0) 2560 td->td_retval[0] = value; 2561 return (error); 2562 } 2563 2564 int 2565 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2566 int name, u_long flags, long *valuep) 2567 { 2568 struct nameidata nd; 2569 int error; 2570 2571 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2572 pathseg, path, td); 2573 if ((error = namei(&nd)) != 0) 2574 return (error); 2575 NDFREE_NOTHING(&nd); 2576 2577 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2578 vput(nd.ni_vp); 2579 return (error); 2580 } 2581 2582 /* 2583 * Return target name of a symbolic link. 2584 */ 2585 #ifndef _SYS_SYSPROTO_H_ 2586 struct readlink_args { 2587 char *path; 2588 char *buf; 2589 size_t count; 2590 }; 2591 #endif 2592 int 2593 sys_readlink(struct thread *td, struct readlink_args *uap) 2594 { 2595 2596 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2597 uap->buf, UIO_USERSPACE, uap->count)); 2598 } 2599 #ifndef _SYS_SYSPROTO_H_ 2600 struct readlinkat_args { 2601 int fd; 2602 char *path; 2603 char *buf; 2604 size_t bufsize; 2605 }; 2606 #endif 2607 int 2608 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2609 { 2610 2611 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2612 uap->buf, UIO_USERSPACE, uap->bufsize)); 2613 } 2614 2615 int 2616 kern_readlinkat(struct thread *td, int fd, const char *path, 2617 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2618 { 2619 struct vnode *vp; 2620 struct nameidata nd; 2621 int error; 2622 2623 if (count > IOSIZE_MAX) 2624 return (EINVAL); 2625 2626 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2627 pathseg, path, fd, td); 2628 2629 if ((error = namei(&nd)) != 0) 2630 return (error); 2631 NDFREE_NOTHING(&nd); 2632 vp = nd.ni_vp; 2633 2634 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2635 vput(vp); 2636 2637 return (error); 2638 } 2639 2640 /* 2641 * Helper function to readlink from a vnode 2642 */ 2643 static int 2644 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2645 struct thread *td) 2646 { 2647 struct iovec aiov; 2648 struct uio auio; 2649 int error; 2650 2651 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2652 #ifdef MAC 2653 error = mac_vnode_check_readlink(td->td_ucred, vp); 2654 if (error != 0) 2655 return (error); 2656 #endif 2657 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2658 return (EINVAL); 2659 2660 aiov.iov_base = buf; 2661 aiov.iov_len = count; 2662 auio.uio_iov = &aiov; 2663 auio.uio_iovcnt = 1; 2664 auio.uio_offset = 0; 2665 auio.uio_rw = UIO_READ; 2666 auio.uio_segflg = bufseg; 2667 auio.uio_td = td; 2668 auio.uio_resid = count; 2669 error = VOP_READLINK(vp, &auio, td->td_ucred); 2670 td->td_retval[0] = count - auio.uio_resid; 2671 return (error); 2672 } 2673 2674 /* 2675 * Common implementation code for chflags() and fchflags(). 2676 */ 2677 static int 2678 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2679 { 2680 struct mount *mp; 2681 struct vattr vattr; 2682 int error; 2683 2684 /* We can't support the value matching VNOVAL. */ 2685 if (flags == VNOVAL) 2686 return (EOPNOTSUPP); 2687 2688 /* 2689 * Prevent non-root users from setting flags on devices. When 2690 * a device is reused, users can retain ownership of the device 2691 * if they are allowed to set flags and programs assume that 2692 * chown can't fail when done as root. 2693 */ 2694 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2695 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2696 if (error != 0) 2697 return (error); 2698 } 2699 2700 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2701 return (error); 2702 VATTR_NULL(&vattr); 2703 vattr.va_flags = flags; 2704 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2705 #ifdef MAC 2706 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2707 if (error == 0) 2708 #endif 2709 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2710 VOP_UNLOCK(vp); 2711 vn_finished_write(mp); 2712 return (error); 2713 } 2714 2715 /* 2716 * Change flags of a file given a path name. 2717 */ 2718 #ifndef _SYS_SYSPROTO_H_ 2719 struct chflags_args { 2720 const char *path; 2721 u_long flags; 2722 }; 2723 #endif 2724 int 2725 sys_chflags(struct thread *td, struct chflags_args *uap) 2726 { 2727 2728 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2729 uap->flags, 0)); 2730 } 2731 2732 #ifndef _SYS_SYSPROTO_H_ 2733 struct chflagsat_args { 2734 int fd; 2735 const char *path; 2736 u_long flags; 2737 int atflag; 2738 } 2739 #endif 2740 int 2741 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2742 { 2743 2744 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2745 AT_EMPTY_PATH)) != 0) 2746 return (EINVAL); 2747 2748 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2749 uap->flags, uap->atflag)); 2750 } 2751 2752 /* 2753 * Same as chflags() but doesn't follow symlinks. 2754 */ 2755 #ifndef _SYS_SYSPROTO_H_ 2756 struct lchflags_args { 2757 const char *path; 2758 u_long flags; 2759 }; 2760 #endif 2761 int 2762 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2763 { 2764 2765 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2766 uap->flags, AT_SYMLINK_NOFOLLOW)); 2767 } 2768 2769 static int 2770 kern_chflagsat(struct thread *td, int fd, const char *path, 2771 enum uio_seg pathseg, u_long flags, int atflag) 2772 { 2773 struct nameidata nd; 2774 int error; 2775 2776 AUDIT_ARG_FFLAGS(flags); 2777 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW | 2778 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2779 fd, &cap_fchflags_rights, td); 2780 if ((error = namei(&nd)) != 0) 2781 return (error); 2782 NDFREE_NOTHING(&nd); 2783 error = setfflags(td, nd.ni_vp, flags); 2784 vrele(nd.ni_vp); 2785 return (error); 2786 } 2787 2788 /* 2789 * Change flags of a file given a file descriptor. 2790 */ 2791 #ifndef _SYS_SYSPROTO_H_ 2792 struct fchflags_args { 2793 int fd; 2794 u_long flags; 2795 }; 2796 #endif 2797 int 2798 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2799 { 2800 struct file *fp; 2801 int error; 2802 2803 AUDIT_ARG_FD(uap->fd); 2804 AUDIT_ARG_FFLAGS(uap->flags); 2805 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2806 &fp); 2807 if (error != 0) 2808 return (error); 2809 #ifdef AUDIT 2810 if (AUDITING_TD(td)) { 2811 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2812 AUDIT_ARG_VNODE1(fp->f_vnode); 2813 VOP_UNLOCK(fp->f_vnode); 2814 } 2815 #endif 2816 error = setfflags(td, fp->f_vnode, uap->flags); 2817 fdrop(fp, td); 2818 return (error); 2819 } 2820 2821 /* 2822 * Common implementation code for chmod(), lchmod() and fchmod(). 2823 */ 2824 int 2825 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2826 { 2827 struct mount *mp; 2828 struct vattr vattr; 2829 int error; 2830 2831 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2832 return (error); 2833 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2834 VATTR_NULL(&vattr); 2835 vattr.va_mode = mode & ALLPERMS; 2836 #ifdef MAC 2837 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2838 if (error == 0) 2839 #endif 2840 error = VOP_SETATTR(vp, &vattr, cred); 2841 VOP_UNLOCK(vp); 2842 vn_finished_write(mp); 2843 return (error); 2844 } 2845 2846 /* 2847 * Change mode of a file given path name. 2848 */ 2849 #ifndef _SYS_SYSPROTO_H_ 2850 struct chmod_args { 2851 char *path; 2852 int mode; 2853 }; 2854 #endif 2855 int 2856 sys_chmod(struct thread *td, struct chmod_args *uap) 2857 { 2858 2859 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2860 uap->mode, 0)); 2861 } 2862 2863 #ifndef _SYS_SYSPROTO_H_ 2864 struct fchmodat_args { 2865 int dirfd; 2866 char *path; 2867 mode_t mode; 2868 int flag; 2869 } 2870 #endif 2871 int 2872 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2873 { 2874 2875 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2876 AT_EMPTY_PATH)) != 0) 2877 return (EINVAL); 2878 2879 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2880 uap->mode, uap->flag)); 2881 } 2882 2883 /* 2884 * Change mode of a file given path name (don't follow links.) 2885 */ 2886 #ifndef _SYS_SYSPROTO_H_ 2887 struct lchmod_args { 2888 char *path; 2889 int mode; 2890 }; 2891 #endif 2892 int 2893 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2894 { 2895 2896 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2897 uap->mode, AT_SYMLINK_NOFOLLOW)); 2898 } 2899 2900 int 2901 kern_fchmodat(struct thread *td, int fd, const char *path, 2902 enum uio_seg pathseg, mode_t mode, int flag) 2903 { 2904 struct nameidata nd; 2905 int error; 2906 2907 AUDIT_ARG_MODE(mode); 2908 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 2909 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2910 fd, &cap_fchmod_rights, td); 2911 if ((error = namei(&nd)) != 0) 2912 return (error); 2913 NDFREE_NOTHING(&nd); 2914 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2915 vrele(nd.ni_vp); 2916 return (error); 2917 } 2918 2919 /* 2920 * Change mode of a file given a file descriptor. 2921 */ 2922 #ifndef _SYS_SYSPROTO_H_ 2923 struct fchmod_args { 2924 int fd; 2925 int mode; 2926 }; 2927 #endif 2928 int 2929 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2930 { 2931 struct file *fp; 2932 int error; 2933 2934 AUDIT_ARG_FD(uap->fd); 2935 AUDIT_ARG_MODE(uap->mode); 2936 2937 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2938 if (error != 0) 2939 return (error); 2940 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2941 fdrop(fp, td); 2942 return (error); 2943 } 2944 2945 /* 2946 * Common implementation for chown(), lchown(), and fchown() 2947 */ 2948 int 2949 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2950 gid_t gid) 2951 { 2952 struct mount *mp; 2953 struct vattr vattr; 2954 int error; 2955 2956 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2957 return (error); 2958 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2959 VATTR_NULL(&vattr); 2960 vattr.va_uid = uid; 2961 vattr.va_gid = gid; 2962 #ifdef MAC 2963 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2964 vattr.va_gid); 2965 if (error == 0) 2966 #endif 2967 error = VOP_SETATTR(vp, &vattr, cred); 2968 VOP_UNLOCK(vp); 2969 vn_finished_write(mp); 2970 return (error); 2971 } 2972 2973 /* 2974 * Set ownership given a path name. 2975 */ 2976 #ifndef _SYS_SYSPROTO_H_ 2977 struct chown_args { 2978 char *path; 2979 int uid; 2980 int gid; 2981 }; 2982 #endif 2983 int 2984 sys_chown(struct thread *td, struct chown_args *uap) 2985 { 2986 2987 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2988 uap->gid, 0)); 2989 } 2990 2991 #ifndef _SYS_SYSPROTO_H_ 2992 struct fchownat_args { 2993 int fd; 2994 const char * path; 2995 uid_t uid; 2996 gid_t gid; 2997 int flag; 2998 }; 2999 #endif 3000 int 3001 sys_fchownat(struct thread *td, struct fchownat_args *uap) 3002 { 3003 3004 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3005 AT_EMPTY_PATH)) != 0) 3006 return (EINVAL); 3007 3008 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 3009 uap->gid, uap->flag)); 3010 } 3011 3012 int 3013 kern_fchownat(struct thread *td, int fd, const char *path, 3014 enum uio_seg pathseg, int uid, int gid, int flag) 3015 { 3016 struct nameidata nd; 3017 int error; 3018 3019 AUDIT_ARG_OWNER(uid, gid); 3020 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3021 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3022 fd, &cap_fchown_rights, td); 3023 3024 if ((error = namei(&nd)) != 0) 3025 return (error); 3026 NDFREE_NOTHING(&nd); 3027 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 3028 vrele(nd.ni_vp); 3029 return (error); 3030 } 3031 3032 /* 3033 * Set ownership given a path name, do not cross symlinks. 3034 */ 3035 #ifndef _SYS_SYSPROTO_H_ 3036 struct lchown_args { 3037 char *path; 3038 int uid; 3039 int gid; 3040 }; 3041 #endif 3042 int 3043 sys_lchown(struct thread *td, struct lchown_args *uap) 3044 { 3045 3046 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3047 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 3048 } 3049 3050 /* 3051 * Set ownership given a file descriptor. 3052 */ 3053 #ifndef _SYS_SYSPROTO_H_ 3054 struct fchown_args { 3055 int fd; 3056 int uid; 3057 int gid; 3058 }; 3059 #endif 3060 int 3061 sys_fchown(struct thread *td, struct fchown_args *uap) 3062 { 3063 struct file *fp; 3064 int error; 3065 3066 AUDIT_ARG_FD(uap->fd); 3067 AUDIT_ARG_OWNER(uap->uid, uap->gid); 3068 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 3069 if (error != 0) 3070 return (error); 3071 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 3072 fdrop(fp, td); 3073 return (error); 3074 } 3075 3076 /* 3077 * Common implementation code for utimes(), lutimes(), and futimes(). 3078 */ 3079 static int 3080 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 3081 struct timespec *tsp) 3082 { 3083 struct timeval tv[2]; 3084 const struct timeval *tvp; 3085 int error; 3086 3087 if (usrtvp == NULL) { 3088 vfs_timestamp(&tsp[0]); 3089 tsp[1] = tsp[0]; 3090 } else { 3091 if (tvpseg == UIO_SYSSPACE) { 3092 tvp = usrtvp; 3093 } else { 3094 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3095 return (error); 3096 tvp = tv; 3097 } 3098 3099 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3100 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3101 return (EINVAL); 3102 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3103 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3104 } 3105 return (0); 3106 } 3107 3108 /* 3109 * Common implementation code for futimens(), utimensat(). 3110 */ 3111 #define UTIMENS_NULL 0x1 3112 #define UTIMENS_EXIT 0x2 3113 static int 3114 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3115 struct timespec *tsp, int *retflags) 3116 { 3117 struct timespec tsnow; 3118 int error; 3119 3120 vfs_timestamp(&tsnow); 3121 *retflags = 0; 3122 if (usrtsp == NULL) { 3123 tsp[0] = tsnow; 3124 tsp[1] = tsnow; 3125 *retflags |= UTIMENS_NULL; 3126 return (0); 3127 } 3128 if (tspseg == UIO_SYSSPACE) { 3129 tsp[0] = usrtsp[0]; 3130 tsp[1] = usrtsp[1]; 3131 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3132 return (error); 3133 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3134 *retflags |= UTIMENS_EXIT; 3135 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3136 *retflags |= UTIMENS_NULL; 3137 if (tsp[0].tv_nsec == UTIME_OMIT) 3138 tsp[0].tv_sec = VNOVAL; 3139 else if (tsp[0].tv_nsec == UTIME_NOW) 3140 tsp[0] = tsnow; 3141 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3142 return (EINVAL); 3143 if (tsp[1].tv_nsec == UTIME_OMIT) 3144 tsp[1].tv_sec = VNOVAL; 3145 else if (tsp[1].tv_nsec == UTIME_NOW) 3146 tsp[1] = tsnow; 3147 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3148 return (EINVAL); 3149 3150 return (0); 3151 } 3152 3153 /* 3154 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3155 * and utimensat(). 3156 */ 3157 static int 3158 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3159 int numtimes, int nullflag) 3160 { 3161 struct mount *mp; 3162 struct vattr vattr; 3163 int error, setbirthtime; 3164 3165 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3166 return (error); 3167 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3168 setbirthtime = 0; 3169 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3170 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3171 setbirthtime = 1; 3172 VATTR_NULL(&vattr); 3173 vattr.va_atime = ts[0]; 3174 vattr.va_mtime = ts[1]; 3175 if (setbirthtime) 3176 vattr.va_birthtime = ts[1]; 3177 if (numtimes > 2) 3178 vattr.va_birthtime = ts[2]; 3179 if (nullflag) 3180 vattr.va_vaflags |= VA_UTIMES_NULL; 3181 #ifdef MAC 3182 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3183 vattr.va_mtime); 3184 #endif 3185 if (error == 0) 3186 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3187 VOP_UNLOCK(vp); 3188 vn_finished_write(mp); 3189 return (error); 3190 } 3191 3192 /* 3193 * Set the access and modification times of a file. 3194 */ 3195 #ifndef _SYS_SYSPROTO_H_ 3196 struct utimes_args { 3197 char *path; 3198 struct timeval *tptr; 3199 }; 3200 #endif 3201 int 3202 sys_utimes(struct thread *td, struct utimes_args *uap) 3203 { 3204 3205 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3206 uap->tptr, UIO_USERSPACE)); 3207 } 3208 3209 #ifndef _SYS_SYSPROTO_H_ 3210 struct futimesat_args { 3211 int fd; 3212 const char * path; 3213 const struct timeval * times; 3214 }; 3215 #endif 3216 int 3217 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3218 { 3219 3220 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3221 uap->times, UIO_USERSPACE)); 3222 } 3223 3224 int 3225 kern_utimesat(struct thread *td, int fd, const char *path, 3226 enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) 3227 { 3228 struct nameidata nd; 3229 struct timespec ts[2]; 3230 int error; 3231 3232 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3233 return (error); 3234 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3235 &cap_futimes_rights, td); 3236 3237 if ((error = namei(&nd)) != 0) 3238 return (error); 3239 NDFREE_NOTHING(&nd); 3240 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3241 vrele(nd.ni_vp); 3242 return (error); 3243 } 3244 3245 /* 3246 * Set the access and modification times of a file. 3247 */ 3248 #ifndef _SYS_SYSPROTO_H_ 3249 struct lutimes_args { 3250 char *path; 3251 struct timeval *tptr; 3252 }; 3253 #endif 3254 int 3255 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3256 { 3257 3258 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3259 UIO_USERSPACE)); 3260 } 3261 3262 int 3263 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3264 struct timeval *tptr, enum uio_seg tptrseg) 3265 { 3266 struct timespec ts[2]; 3267 struct nameidata nd; 3268 int error; 3269 3270 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3271 return (error); 3272 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3273 if ((error = namei(&nd)) != 0) 3274 return (error); 3275 NDFREE_NOTHING(&nd); 3276 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3277 vrele(nd.ni_vp); 3278 return (error); 3279 } 3280 3281 /* 3282 * Set the access and modification times of a file. 3283 */ 3284 #ifndef _SYS_SYSPROTO_H_ 3285 struct futimes_args { 3286 int fd; 3287 struct timeval *tptr; 3288 }; 3289 #endif 3290 int 3291 sys_futimes(struct thread *td, struct futimes_args *uap) 3292 { 3293 3294 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3295 } 3296 3297 int 3298 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3299 enum uio_seg tptrseg) 3300 { 3301 struct timespec ts[2]; 3302 struct file *fp; 3303 int error; 3304 3305 AUDIT_ARG_FD(fd); 3306 error = getutimes(tptr, tptrseg, ts); 3307 if (error != 0) 3308 return (error); 3309 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3310 if (error != 0) 3311 return (error); 3312 #ifdef AUDIT 3313 if (AUDITING_TD(td)) { 3314 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3315 AUDIT_ARG_VNODE1(fp->f_vnode); 3316 VOP_UNLOCK(fp->f_vnode); 3317 } 3318 #endif 3319 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3320 fdrop(fp, td); 3321 return (error); 3322 } 3323 3324 int 3325 sys_futimens(struct thread *td, struct futimens_args *uap) 3326 { 3327 3328 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3329 } 3330 3331 int 3332 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3333 enum uio_seg tptrseg) 3334 { 3335 struct timespec ts[2]; 3336 struct file *fp; 3337 int error, flags; 3338 3339 AUDIT_ARG_FD(fd); 3340 error = getutimens(tptr, tptrseg, ts, &flags); 3341 if (error != 0) 3342 return (error); 3343 if (flags & UTIMENS_EXIT) 3344 return (0); 3345 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3346 if (error != 0) 3347 return (error); 3348 #ifdef AUDIT 3349 if (AUDITING_TD(td)) { 3350 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3351 AUDIT_ARG_VNODE1(fp->f_vnode); 3352 VOP_UNLOCK(fp->f_vnode); 3353 } 3354 #endif 3355 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3356 fdrop(fp, td); 3357 return (error); 3358 } 3359 3360 int 3361 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3362 { 3363 3364 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3365 uap->times, UIO_USERSPACE, uap->flag)); 3366 } 3367 3368 int 3369 kern_utimensat(struct thread *td, int fd, const char *path, 3370 enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg, 3371 int flag) 3372 { 3373 struct nameidata nd; 3374 struct timespec ts[2]; 3375 int error, flags; 3376 3377 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3378 AT_EMPTY_PATH)) != 0) 3379 return (EINVAL); 3380 3381 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3382 return (error); 3383 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3384 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, 3385 pathseg, path, fd, &cap_futimes_rights, td); 3386 if ((error = namei(&nd)) != 0) 3387 return (error); 3388 /* 3389 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3390 * POSIX states: 3391 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3392 * "Search permission is denied by a component of the path prefix." 3393 */ 3394 NDFREE_NOTHING(&nd); 3395 if ((flags & UTIMENS_EXIT) == 0) 3396 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3397 vrele(nd.ni_vp); 3398 return (error); 3399 } 3400 3401 /* 3402 * Truncate a file given its path name. 3403 */ 3404 #ifndef _SYS_SYSPROTO_H_ 3405 struct truncate_args { 3406 char *path; 3407 int pad; 3408 off_t length; 3409 }; 3410 #endif 3411 int 3412 sys_truncate(struct thread *td, struct truncate_args *uap) 3413 { 3414 3415 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3416 } 3417 3418 int 3419 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3420 off_t length) 3421 { 3422 struct mount *mp; 3423 struct vnode *vp; 3424 void *rl_cookie; 3425 struct vattr vattr; 3426 struct nameidata nd; 3427 int error; 3428 3429 if (length < 0) 3430 return (EINVAL); 3431 NDPREINIT(&nd); 3432 retry: 3433 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3434 if ((error = namei(&nd)) != 0) 3435 return (error); 3436 vp = nd.ni_vp; 3437 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3438 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3439 vn_rangelock_unlock(vp, rl_cookie); 3440 vrele(vp); 3441 return (error); 3442 } 3443 NDFREE(&nd, NDF_ONLY_PNBUF); 3444 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3445 if (vp->v_type == VDIR) 3446 error = EISDIR; 3447 #ifdef MAC 3448 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3449 } 3450 #endif 3451 else if ((error = vn_writechk(vp)) == 0 && 3452 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3453 VATTR_NULL(&vattr); 3454 vattr.va_size = length; 3455 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3456 } 3457 VOP_UNLOCK(vp); 3458 vn_finished_write(mp); 3459 vn_rangelock_unlock(vp, rl_cookie); 3460 vrele(vp); 3461 if (error == ERELOOKUP) 3462 goto retry; 3463 return (error); 3464 } 3465 3466 #if defined(COMPAT_43) 3467 /* 3468 * Truncate a file given its path name. 3469 */ 3470 #ifndef _SYS_SYSPROTO_H_ 3471 struct otruncate_args { 3472 char *path; 3473 long length; 3474 }; 3475 #endif 3476 int 3477 otruncate(struct thread *td, struct otruncate_args *uap) 3478 { 3479 3480 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3481 } 3482 #endif /* COMPAT_43 */ 3483 3484 #if defined(COMPAT_FREEBSD6) 3485 /* Versions with the pad argument */ 3486 int 3487 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3488 { 3489 3490 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3491 } 3492 3493 int 3494 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3495 { 3496 3497 return (kern_ftruncate(td, uap->fd, uap->length)); 3498 } 3499 #endif 3500 3501 int 3502 kern_fsync(struct thread *td, int fd, bool fullsync) 3503 { 3504 struct vnode *vp; 3505 struct mount *mp; 3506 struct file *fp; 3507 int error, lock_flags; 3508 3509 AUDIT_ARG_FD(fd); 3510 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3511 if (error != 0) 3512 return (error); 3513 vp = fp->f_vnode; 3514 #if 0 3515 if (!fullsync) 3516 /* XXXKIB: compete outstanding aio writes */; 3517 #endif 3518 retry: 3519 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3520 if (error != 0) 3521 goto drop; 3522 if (MNT_SHARED_WRITES(mp) || 3523 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3524 lock_flags = LK_SHARED; 3525 } else { 3526 lock_flags = LK_EXCLUSIVE; 3527 } 3528 vn_lock(vp, lock_flags | LK_RETRY); 3529 AUDIT_ARG_VNODE1(vp); 3530 if (vp->v_object != NULL) { 3531 VM_OBJECT_WLOCK(vp->v_object); 3532 vm_object_page_clean(vp->v_object, 0, 0, 0); 3533 VM_OBJECT_WUNLOCK(vp->v_object); 3534 } 3535 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3536 VOP_UNLOCK(vp); 3537 vn_finished_write(mp); 3538 if (error == ERELOOKUP) 3539 goto retry; 3540 drop: 3541 fdrop(fp, td); 3542 return (error); 3543 } 3544 3545 /* 3546 * Sync an open file. 3547 */ 3548 #ifndef _SYS_SYSPROTO_H_ 3549 struct fsync_args { 3550 int fd; 3551 }; 3552 #endif 3553 int 3554 sys_fsync(struct thread *td, struct fsync_args *uap) 3555 { 3556 3557 return (kern_fsync(td, uap->fd, true)); 3558 } 3559 3560 int 3561 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3562 { 3563 3564 return (kern_fsync(td, uap->fd, false)); 3565 } 3566 3567 /* 3568 * Rename files. Source and destination must either both be directories, or 3569 * both not be directories. If target is a directory, it must be empty. 3570 */ 3571 #ifndef _SYS_SYSPROTO_H_ 3572 struct rename_args { 3573 char *from; 3574 char *to; 3575 }; 3576 #endif 3577 int 3578 sys_rename(struct thread *td, struct rename_args *uap) 3579 { 3580 3581 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3582 uap->to, UIO_USERSPACE)); 3583 } 3584 3585 #ifndef _SYS_SYSPROTO_H_ 3586 struct renameat_args { 3587 int oldfd; 3588 char *old; 3589 int newfd; 3590 char *new; 3591 }; 3592 #endif 3593 int 3594 sys_renameat(struct thread *td, struct renameat_args *uap) 3595 { 3596 3597 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3598 UIO_USERSPACE)); 3599 } 3600 3601 #ifdef MAC 3602 static int 3603 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd, 3604 const char *new, enum uio_seg pathseg, struct nameidata *fromnd) 3605 { 3606 int error; 3607 3608 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3609 AUDITVNODE1, pathseg, old, oldfd, &cap_renameat_source_rights, td); 3610 if ((error = namei(fromnd)) != 0) 3611 return (error); 3612 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp, 3613 fromnd->ni_vp, &fromnd->ni_cnd); 3614 VOP_UNLOCK(fromnd->ni_dvp); 3615 if (fromnd->ni_dvp != fromnd->ni_vp) 3616 VOP_UNLOCK(fromnd->ni_vp); 3617 if (error != 0) { 3618 NDFREE(fromnd, NDF_ONLY_PNBUF); 3619 vrele(fromnd->ni_dvp); 3620 vrele(fromnd->ni_vp); 3621 if (fromnd->ni_startdir) 3622 vrele(fromnd->ni_startdir); 3623 } 3624 return (error); 3625 } 3626 #endif 3627 3628 int 3629 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3630 const char *new, enum uio_seg pathseg) 3631 { 3632 struct mount *mp = NULL; 3633 struct vnode *tvp, *fvp, *tdvp; 3634 struct nameidata fromnd, tond; 3635 u_int64_t tondflags; 3636 int error; 3637 3638 again: 3639 bwillwrite(); 3640 #ifdef MAC 3641 if (mac_vnode_check_rename_from_enabled()) { 3642 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg, 3643 &fromnd); 3644 if (error != 0) 3645 return (error); 3646 } else { 3647 #endif 3648 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3649 pathseg, old, oldfd, &cap_renameat_source_rights, td); 3650 if ((error = namei(&fromnd)) != 0) 3651 return (error); 3652 #ifdef MAC 3653 } 3654 #endif 3655 fvp = fromnd.ni_vp; 3656 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | AUDITVNODE2; 3657 if (fromnd.ni_vp->v_type == VDIR) 3658 tondflags |= WILLBEDIR; 3659 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd, 3660 &cap_renameat_target_rights, td); 3661 if ((error = namei(&tond)) != 0) { 3662 /* Translate error code for rename("dir1", "dir2/."). */ 3663 if (error == EISDIR && fvp->v_type == VDIR) 3664 error = EINVAL; 3665 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3666 vrele(fromnd.ni_dvp); 3667 vrele(fvp); 3668 goto out1; 3669 } 3670 tdvp = tond.ni_dvp; 3671 tvp = tond.ni_vp; 3672 error = vn_start_write(fvp, &mp, V_NOWAIT); 3673 if (error != 0) { 3674 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3675 NDFREE(&tond, NDF_ONLY_PNBUF); 3676 if (tvp != NULL) 3677 vput(tvp); 3678 if (tdvp == tvp) 3679 vrele(tdvp); 3680 else 3681 vput(tdvp); 3682 vrele(fromnd.ni_dvp); 3683 vrele(fvp); 3684 vrele(tond.ni_startdir); 3685 if (fromnd.ni_startdir != NULL) 3686 vrele(fromnd.ni_startdir); 3687 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3688 if (error != 0) 3689 return (error); 3690 goto again; 3691 } 3692 if (tvp != NULL) { 3693 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3694 error = ENOTDIR; 3695 goto out; 3696 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3697 error = EISDIR; 3698 goto out; 3699 } 3700 #ifdef CAPABILITIES 3701 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3702 /* 3703 * If the target already exists we require CAP_UNLINKAT 3704 * from 'newfd', when newfd was used for the lookup. 3705 */ 3706 error = cap_check(&tond.ni_filecaps.fc_rights, 3707 &cap_unlinkat_rights); 3708 if (error != 0) 3709 goto out; 3710 } 3711 #endif 3712 } 3713 if (fvp == tdvp) { 3714 error = EINVAL; 3715 goto out; 3716 } 3717 /* 3718 * If the source is the same as the destination (that is, if they 3719 * are links to the same vnode), then there is nothing to do. 3720 */ 3721 if (fvp == tvp) 3722 error = ERESTART; 3723 #ifdef MAC 3724 else 3725 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3726 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3727 #endif 3728 out: 3729 if (error == 0) { 3730 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3731 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3732 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3733 NDFREE(&tond, NDF_ONLY_PNBUF); 3734 } else { 3735 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3736 NDFREE(&tond, NDF_ONLY_PNBUF); 3737 if (tvp != NULL) 3738 vput(tvp); 3739 if (tdvp == tvp) 3740 vrele(tdvp); 3741 else 3742 vput(tdvp); 3743 vrele(fromnd.ni_dvp); 3744 vrele(fvp); 3745 } 3746 vrele(tond.ni_startdir); 3747 vn_finished_write(mp); 3748 out1: 3749 if (fromnd.ni_startdir) 3750 vrele(fromnd.ni_startdir); 3751 if (error == ERESTART) 3752 return (0); 3753 if (error == ERELOOKUP) 3754 goto again; 3755 return (error); 3756 } 3757 3758 /* 3759 * Make a directory file. 3760 */ 3761 #ifndef _SYS_SYSPROTO_H_ 3762 struct mkdir_args { 3763 char *path; 3764 int mode; 3765 }; 3766 #endif 3767 int 3768 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3769 { 3770 3771 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3772 uap->mode)); 3773 } 3774 3775 #ifndef _SYS_SYSPROTO_H_ 3776 struct mkdirat_args { 3777 int fd; 3778 char *path; 3779 mode_t mode; 3780 }; 3781 #endif 3782 int 3783 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3784 { 3785 3786 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3787 } 3788 3789 int 3790 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3791 int mode) 3792 { 3793 struct mount *mp; 3794 struct vattr vattr; 3795 struct nameidata nd; 3796 int error; 3797 3798 AUDIT_ARG_MODE(mode); 3799 NDPREINIT(&nd); 3800 restart: 3801 bwillwrite(); 3802 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3803 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR, 3804 segflg, path, fd, &cap_mkdirat_rights, td); 3805 if ((error = namei(&nd)) != 0) 3806 return (error); 3807 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3808 NDFREE(&nd, NDF_ONLY_PNBUF); 3809 vput(nd.ni_dvp); 3810 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3811 return (error); 3812 goto restart; 3813 } 3814 VATTR_NULL(&vattr); 3815 vattr.va_type = VDIR; 3816 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask; 3817 #ifdef MAC 3818 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3819 &vattr); 3820 if (error != 0) 3821 goto out; 3822 #endif 3823 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3824 #ifdef MAC 3825 out: 3826 #endif 3827 NDFREE(&nd, NDF_ONLY_PNBUF); 3828 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 3829 vn_finished_write(mp); 3830 if (error == ERELOOKUP) 3831 goto restart; 3832 return (error); 3833 } 3834 3835 /* 3836 * Remove a directory file. 3837 */ 3838 #ifndef _SYS_SYSPROTO_H_ 3839 struct rmdir_args { 3840 char *path; 3841 }; 3842 #endif 3843 int 3844 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3845 { 3846 3847 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3848 0)); 3849 } 3850 3851 int 3852 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3853 enum uio_seg pathseg, int flag) 3854 { 3855 struct mount *mp; 3856 struct vnode *vp; 3857 struct file *fp; 3858 struct nameidata nd; 3859 cap_rights_t rights; 3860 int error; 3861 3862 fp = NULL; 3863 if (fd != FD_NONE) { 3864 error = getvnode(td, fd, cap_rights_init_one(&rights, 3865 CAP_LOOKUP), &fp); 3866 if (error != 0) 3867 return (error); 3868 } 3869 3870 NDPREINIT(&nd); 3871 restart: 3872 bwillwrite(); 3873 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3874 at2cnpflags(flag, AT_RESOLVE_BENEATH), 3875 pathseg, path, dfd, &cap_unlinkat_rights, td); 3876 if ((error = namei(&nd)) != 0) 3877 goto fdout; 3878 vp = nd.ni_vp; 3879 if (vp->v_type != VDIR) { 3880 error = ENOTDIR; 3881 goto out; 3882 } 3883 /* 3884 * No rmdir "." please. 3885 */ 3886 if (nd.ni_dvp == vp) { 3887 error = EINVAL; 3888 goto out; 3889 } 3890 /* 3891 * The root of a mounted filesystem cannot be deleted. 3892 */ 3893 if (vp->v_vflag & VV_ROOT) { 3894 error = EBUSY; 3895 goto out; 3896 } 3897 3898 if (fp != NULL && fp->f_vnode != vp) { 3899 if (VN_IS_DOOMED(fp->f_vnode)) 3900 error = EBADF; 3901 else 3902 error = EDEADLK; 3903 goto out; 3904 } 3905 3906 #ifdef MAC 3907 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3908 &nd.ni_cnd); 3909 if (error != 0) 3910 goto out; 3911 #endif 3912 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3913 NDFREE(&nd, NDF_ONLY_PNBUF); 3914 vput(vp); 3915 if (nd.ni_dvp == vp) 3916 vrele(nd.ni_dvp); 3917 else 3918 vput(nd.ni_dvp); 3919 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3920 goto fdout; 3921 goto restart; 3922 } 3923 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3924 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3925 vn_finished_write(mp); 3926 out: 3927 NDFREE(&nd, NDF_ONLY_PNBUF); 3928 vput(vp); 3929 if (nd.ni_dvp == vp) 3930 vrele(nd.ni_dvp); 3931 else 3932 vput(nd.ni_dvp); 3933 if (error == ERELOOKUP) 3934 goto restart; 3935 fdout: 3936 if (fp != NULL) 3937 fdrop(fp, td); 3938 return (error); 3939 } 3940 3941 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3942 int 3943 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3944 long *basep, void (*func)(struct freebsd11_dirent *)) 3945 { 3946 struct freebsd11_dirent dstdp; 3947 struct dirent *dp, *edp; 3948 char *dirbuf; 3949 off_t base; 3950 ssize_t resid, ucount; 3951 int error; 3952 3953 /* XXX arbitrary sanity limit on `count'. */ 3954 count = min(count, 64 * 1024); 3955 3956 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3957 3958 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3959 UIO_SYSSPACE); 3960 if (error != 0) 3961 goto done; 3962 if (basep != NULL) 3963 *basep = base; 3964 3965 ucount = 0; 3966 for (dp = (struct dirent *)dirbuf, 3967 edp = (struct dirent *)&dirbuf[count - resid]; 3968 ucount < count && dp < edp; ) { 3969 if (dp->d_reclen == 0) 3970 break; 3971 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3972 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3973 continue; 3974 dstdp.d_type = dp->d_type; 3975 dstdp.d_namlen = dp->d_namlen; 3976 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3977 if (dstdp.d_fileno != dp->d_fileno) { 3978 switch (ino64_trunc_error) { 3979 default: 3980 case 0: 3981 break; 3982 case 1: 3983 error = EOVERFLOW; 3984 goto done; 3985 case 2: 3986 dstdp.d_fileno = UINT32_MAX; 3987 break; 3988 } 3989 } 3990 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3991 ((dp->d_namlen + 1 + 3) &~ 3); 3992 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3993 bzero(dstdp.d_name + dstdp.d_namlen, 3994 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3995 dstdp.d_namlen); 3996 MPASS(dstdp.d_reclen <= dp->d_reclen); 3997 MPASS(ucount + dstdp.d_reclen <= count); 3998 if (func != NULL) 3999 func(&dstdp); 4000 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 4001 if (error != 0) 4002 break; 4003 dp = (struct dirent *)((char *)dp + dp->d_reclen); 4004 ucount += dstdp.d_reclen; 4005 } 4006 4007 done: 4008 free(dirbuf, M_TEMP); 4009 if (error == 0) 4010 td->td_retval[0] = ucount; 4011 return (error); 4012 } 4013 #endif /* COMPAT */ 4014 4015 #ifdef COMPAT_43 4016 static void 4017 ogetdirentries_cvt(struct freebsd11_dirent *dp) 4018 { 4019 #if (BYTE_ORDER == LITTLE_ENDIAN) 4020 /* 4021 * The expected low byte of dp->d_namlen is our dp->d_type. 4022 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 4023 */ 4024 dp->d_type = dp->d_namlen; 4025 dp->d_namlen = 0; 4026 #else 4027 /* 4028 * The dp->d_type is the high byte of the expected dp->d_namlen, 4029 * so must be zero'ed. 4030 */ 4031 dp->d_type = 0; 4032 #endif 4033 } 4034 4035 /* 4036 * Read a block of directory entries in a filesystem independent format. 4037 */ 4038 #ifndef _SYS_SYSPROTO_H_ 4039 struct ogetdirentries_args { 4040 int fd; 4041 char *buf; 4042 u_int count; 4043 long *basep; 4044 }; 4045 #endif 4046 int 4047 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 4048 { 4049 long loff; 4050 int error; 4051 4052 error = kern_ogetdirentries(td, uap, &loff); 4053 if (error == 0) 4054 error = copyout(&loff, uap->basep, sizeof(long)); 4055 return (error); 4056 } 4057 4058 int 4059 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 4060 long *ploff) 4061 { 4062 long base; 4063 int error; 4064 4065 /* XXX arbitrary sanity limit on `count'. */ 4066 if (uap->count > 64 * 1024) 4067 return (EINVAL); 4068 4069 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4070 &base, ogetdirentries_cvt); 4071 4072 if (error == 0 && uap->basep != NULL) 4073 error = copyout(&base, uap->basep, sizeof(long)); 4074 4075 return (error); 4076 } 4077 #endif /* COMPAT_43 */ 4078 4079 #if defined(COMPAT_FREEBSD11) 4080 #ifndef _SYS_SYSPROTO_H_ 4081 struct freebsd11_getdirentries_args { 4082 int fd; 4083 char *buf; 4084 u_int count; 4085 long *basep; 4086 }; 4087 #endif 4088 int 4089 freebsd11_getdirentries(struct thread *td, 4090 struct freebsd11_getdirentries_args *uap) 4091 { 4092 long base; 4093 int error; 4094 4095 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4096 &base, NULL); 4097 4098 if (error == 0 && uap->basep != NULL) 4099 error = copyout(&base, uap->basep, sizeof(long)); 4100 return (error); 4101 } 4102 4103 int 4104 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 4105 { 4106 struct freebsd11_getdirentries_args ap; 4107 4108 ap.fd = uap->fd; 4109 ap.buf = uap->buf; 4110 ap.count = uap->count; 4111 ap.basep = NULL; 4112 return (freebsd11_getdirentries(td, &ap)); 4113 } 4114 #endif /* COMPAT_FREEBSD11 */ 4115 4116 /* 4117 * Read a block of directory entries in a filesystem independent format. 4118 */ 4119 int 4120 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4121 { 4122 off_t base; 4123 int error; 4124 4125 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4126 NULL, UIO_USERSPACE); 4127 if (error != 0) 4128 return (error); 4129 if (uap->basep != NULL) 4130 error = copyout(&base, uap->basep, sizeof(off_t)); 4131 return (error); 4132 } 4133 4134 int 4135 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4136 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4137 { 4138 struct vnode *vp; 4139 struct file *fp; 4140 struct uio auio; 4141 struct iovec aiov; 4142 off_t loff; 4143 int error, eofflag; 4144 off_t foffset; 4145 4146 AUDIT_ARG_FD(fd); 4147 if (count > IOSIZE_MAX) 4148 return (EINVAL); 4149 auio.uio_resid = count; 4150 error = getvnode(td, fd, &cap_read_rights, &fp); 4151 if (error != 0) 4152 return (error); 4153 if ((fp->f_flag & FREAD) == 0) { 4154 fdrop(fp, td); 4155 return (EBADF); 4156 } 4157 vp = fp->f_vnode; 4158 foffset = foffset_lock(fp, 0); 4159 unionread: 4160 if (vp->v_type != VDIR) { 4161 error = EINVAL; 4162 goto fail; 4163 } 4164 aiov.iov_base = buf; 4165 aiov.iov_len = count; 4166 auio.uio_iov = &aiov; 4167 auio.uio_iovcnt = 1; 4168 auio.uio_rw = UIO_READ; 4169 auio.uio_segflg = bufseg; 4170 auio.uio_td = td; 4171 vn_lock(vp, LK_SHARED | LK_RETRY); 4172 AUDIT_ARG_VNODE1(vp); 4173 loff = auio.uio_offset = foffset; 4174 #ifdef MAC 4175 error = mac_vnode_check_readdir(td->td_ucred, vp); 4176 if (error == 0) 4177 #endif 4178 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4179 NULL); 4180 foffset = auio.uio_offset; 4181 if (error != 0) { 4182 VOP_UNLOCK(vp); 4183 goto fail; 4184 } 4185 if (count == auio.uio_resid && 4186 (vp->v_vflag & VV_ROOT) && 4187 (vp->v_mount->mnt_flag & MNT_UNION)) { 4188 struct vnode *tvp = vp; 4189 4190 vp = vp->v_mount->mnt_vnodecovered; 4191 VREF(vp); 4192 fp->f_vnode = vp; 4193 foffset = 0; 4194 vput(tvp); 4195 goto unionread; 4196 } 4197 VOP_UNLOCK(vp); 4198 *basep = loff; 4199 if (residp != NULL) 4200 *residp = auio.uio_resid; 4201 td->td_retval[0] = count - auio.uio_resid; 4202 fail: 4203 foffset_unlock(fp, foffset, 0); 4204 fdrop(fp, td); 4205 return (error); 4206 } 4207 4208 /* 4209 * Set the mode mask for creation of filesystem nodes. 4210 */ 4211 #ifndef _SYS_SYSPROTO_H_ 4212 struct umask_args { 4213 int newmask; 4214 }; 4215 #endif 4216 int 4217 sys_umask(struct thread *td, struct umask_args *uap) 4218 { 4219 struct pwddesc *pdp; 4220 4221 pdp = td->td_proc->p_pd; 4222 PWDDESC_XLOCK(pdp); 4223 td->td_retval[0] = pdp->pd_cmask; 4224 pdp->pd_cmask = uap->newmask & ALLPERMS; 4225 PWDDESC_XUNLOCK(pdp); 4226 return (0); 4227 } 4228 4229 /* 4230 * Void all references to file by ripping underlying filesystem away from 4231 * vnode. 4232 */ 4233 #ifndef _SYS_SYSPROTO_H_ 4234 struct revoke_args { 4235 char *path; 4236 }; 4237 #endif 4238 int 4239 sys_revoke(struct thread *td, struct revoke_args *uap) 4240 { 4241 struct vnode *vp; 4242 struct vattr vattr; 4243 struct nameidata nd; 4244 int error; 4245 4246 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4247 uap->path, td); 4248 if ((error = namei(&nd)) != 0) 4249 return (error); 4250 vp = nd.ni_vp; 4251 NDFREE_NOTHING(&nd); 4252 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4253 error = EINVAL; 4254 goto out; 4255 } 4256 #ifdef MAC 4257 error = mac_vnode_check_revoke(td->td_ucred, vp); 4258 if (error != 0) 4259 goto out; 4260 #endif 4261 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4262 if (error != 0) 4263 goto out; 4264 if (td->td_ucred->cr_uid != vattr.va_uid) { 4265 error = priv_check(td, PRIV_VFS_ADMIN); 4266 if (error != 0) 4267 goto out; 4268 } 4269 if (devfs_usecount(vp) > 0) 4270 VOP_REVOKE(vp, REVOKEALL); 4271 out: 4272 vput(vp); 4273 return (error); 4274 } 4275 4276 /* 4277 * This variant of getvnode() allows O_PATH files. Caller should 4278 * ensure that returned file and vnode are only used for compatible 4279 * semantics. 4280 */ 4281 int 4282 getvnode_path(struct thread *td, int fd, cap_rights_t *rightsp, 4283 struct file **fpp) 4284 { 4285 struct file *fp; 4286 int error; 4287 4288 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp); 4289 if (error != 0) 4290 return (error); 4291 4292 /* 4293 * The file could be not of the vnode type, or it may be not 4294 * yet fully initialized, in which case the f_vnode pointer 4295 * may be set, but f_ops is still badfileops. E.g., 4296 * devfs_open() transiently create such situation to 4297 * facilitate csw d_fdopen(). 4298 * 4299 * Dupfdopen() handling in kern_openat() installs the 4300 * half-baked file into the process descriptor table, allowing 4301 * other thread to dereference it. Guard against the race by 4302 * checking f_ops. 4303 */ 4304 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4305 fdrop(fp, td); 4306 return (EINVAL); 4307 } 4308 4309 *fpp = fp; 4310 return (0); 4311 } 4312 4313 /* 4314 * Convert a user file descriptor to a kernel file entry and check 4315 * that, if it is a capability, the correct rights are present. 4316 * A reference on the file entry is held upon returning. 4317 */ 4318 int 4319 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4320 { 4321 int error; 4322 4323 error = getvnode_path(td, fd, rightsp, fpp); 4324 4325 /* 4326 * Filter out O_PATH file descriptors, most getvnode() callers 4327 * do not call fo_ methods. 4328 */ 4329 if (error == 0 && (*fpp)->f_ops == &path_fileops) { 4330 fdrop(*fpp, td); 4331 error = EBADF; 4332 } 4333 4334 return (error); 4335 } 4336 4337 /* 4338 * Get an (NFS) file handle. 4339 */ 4340 #ifndef _SYS_SYSPROTO_H_ 4341 struct lgetfh_args { 4342 char *fname; 4343 fhandle_t *fhp; 4344 }; 4345 #endif 4346 int 4347 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4348 { 4349 4350 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4351 UIO_USERSPACE, uap->fhp, UIO_USERSPACE)); 4352 } 4353 4354 #ifndef _SYS_SYSPROTO_H_ 4355 struct getfh_args { 4356 char *fname; 4357 fhandle_t *fhp; 4358 }; 4359 #endif 4360 int 4361 sys_getfh(struct thread *td, struct getfh_args *uap) 4362 { 4363 4364 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4365 uap->fhp, UIO_USERSPACE)); 4366 } 4367 4368 /* 4369 * syscall for the rpc.lockd to use to translate an open descriptor into 4370 * a NFS file handle. 4371 * 4372 * warning: do not remove the priv_check() call or this becomes one giant 4373 * security hole. 4374 */ 4375 #ifndef _SYS_SYSPROTO_H_ 4376 struct getfhat_args { 4377 int fd; 4378 char *path; 4379 fhandle_t *fhp; 4380 int flags; 4381 }; 4382 #endif 4383 int 4384 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4385 { 4386 4387 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4388 return (EINVAL); 4389 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4390 uap->fhp, UIO_USERSPACE)); 4391 } 4392 4393 int 4394 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4395 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg) 4396 { 4397 struct nameidata nd; 4398 fhandle_t fh; 4399 struct vnode *vp; 4400 int error; 4401 4402 error = priv_check(td, PRIV_VFS_GETFH); 4403 if (error != 0) 4404 return (error); 4405 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4406 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4407 fd, td); 4408 error = namei(&nd); 4409 if (error != 0) 4410 return (error); 4411 NDFREE_NOTHING(&nd); 4412 vp = nd.ni_vp; 4413 bzero(&fh, sizeof(fh)); 4414 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4415 error = VOP_VPTOFH(vp, &fh.fh_fid); 4416 vput(vp); 4417 if (error == 0) { 4418 if (fhseg == UIO_USERSPACE) 4419 error = copyout(&fh, fhp, sizeof (fh)); 4420 else 4421 memcpy(fhp, &fh, sizeof(fh)); 4422 } 4423 return (error); 4424 } 4425 4426 #ifndef _SYS_SYSPROTO_H_ 4427 struct fhlink_args { 4428 fhandle_t *fhp; 4429 const char *to; 4430 }; 4431 #endif 4432 int 4433 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4434 { 4435 4436 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4437 } 4438 4439 #ifndef _SYS_SYSPROTO_H_ 4440 struct fhlinkat_args { 4441 fhandle_t *fhp; 4442 int tofd; 4443 const char *to; 4444 }; 4445 #endif 4446 int 4447 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4448 { 4449 4450 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4451 } 4452 4453 static int 4454 kern_fhlinkat(struct thread *td, int fd, const char *path, 4455 enum uio_seg pathseg, fhandle_t *fhp) 4456 { 4457 fhandle_t fh; 4458 struct mount *mp; 4459 struct vnode *vp; 4460 int error; 4461 4462 error = priv_check(td, PRIV_VFS_GETFH); 4463 if (error != 0) 4464 return (error); 4465 error = copyin(fhp, &fh, sizeof(fh)); 4466 if (error != 0) 4467 return (error); 4468 do { 4469 bwillwrite(); 4470 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4471 return (ESTALE); 4472 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4473 vfs_unbusy(mp); 4474 if (error != 0) 4475 return (error); 4476 VOP_UNLOCK(vp); 4477 error = kern_linkat_vp(td, vp, fd, path, pathseg); 4478 } while (error == EAGAIN || error == ERELOOKUP); 4479 return (error); 4480 } 4481 4482 #ifndef _SYS_SYSPROTO_H_ 4483 struct fhreadlink_args { 4484 fhandle_t *fhp; 4485 char *buf; 4486 size_t bufsize; 4487 }; 4488 #endif 4489 int 4490 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4491 { 4492 fhandle_t fh; 4493 struct mount *mp; 4494 struct vnode *vp; 4495 int error; 4496 4497 error = priv_check(td, PRIV_VFS_GETFH); 4498 if (error != 0) 4499 return (error); 4500 if (uap->bufsize > IOSIZE_MAX) 4501 return (EINVAL); 4502 error = copyin(uap->fhp, &fh, sizeof(fh)); 4503 if (error != 0) 4504 return (error); 4505 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4506 return (ESTALE); 4507 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4508 vfs_unbusy(mp); 4509 if (error != 0) 4510 return (error); 4511 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4512 vput(vp); 4513 return (error); 4514 } 4515 4516 /* 4517 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4518 * open descriptor. 4519 * 4520 * warning: do not remove the priv_check() call or this becomes one giant 4521 * security hole. 4522 */ 4523 #ifndef _SYS_SYSPROTO_H_ 4524 struct fhopen_args { 4525 const struct fhandle *u_fhp; 4526 int flags; 4527 }; 4528 #endif 4529 int 4530 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4531 { 4532 return (kern_fhopen(td, uap->u_fhp, uap->flags)); 4533 } 4534 4535 int 4536 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags) 4537 { 4538 struct mount *mp; 4539 struct vnode *vp; 4540 struct fhandle fhp; 4541 struct file *fp; 4542 int fmode, error; 4543 int indx; 4544 4545 error = priv_check(td, PRIV_VFS_FHOPEN); 4546 if (error != 0) 4547 return (error); 4548 indx = -1; 4549 fmode = FFLAGS(flags); 4550 /* why not allow a non-read/write open for our lockd? */ 4551 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4552 return (EINVAL); 4553 error = copyin(u_fhp, &fhp, sizeof(fhp)); 4554 if (error != 0) 4555 return(error); 4556 /* find the mount point */ 4557 mp = vfs_busyfs(&fhp.fh_fsid); 4558 if (mp == NULL) 4559 return (ESTALE); 4560 /* now give me my vnode, it gets returned to me locked */ 4561 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4562 vfs_unbusy(mp); 4563 if (error != 0) 4564 return (error); 4565 4566 error = falloc_noinstall(td, &fp); 4567 if (error != 0) { 4568 vput(vp); 4569 return (error); 4570 } 4571 /* 4572 * An extra reference on `fp' has been held for us by 4573 * falloc_noinstall(). 4574 */ 4575 4576 #ifdef INVARIANTS 4577 td->td_dupfd = -1; 4578 #endif 4579 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4580 if (error != 0) { 4581 KASSERT(fp->f_ops == &badfileops, 4582 ("VOP_OPEN in fhopen() set f_ops")); 4583 KASSERT(td->td_dupfd < 0, 4584 ("fhopen() encountered fdopen()")); 4585 4586 vput(vp); 4587 goto bad; 4588 } 4589 #ifdef INVARIANTS 4590 td->td_dupfd = 0; 4591 #endif 4592 fp->f_vnode = vp; 4593 finit_vnode(fp, fmode, NULL, &vnops); 4594 VOP_UNLOCK(vp); 4595 if ((fmode & O_TRUNC) != 0) { 4596 error = fo_truncate(fp, 0, td->td_ucred, td); 4597 if (error != 0) 4598 goto bad; 4599 } 4600 4601 error = finstall(td, fp, &indx, fmode, NULL); 4602 bad: 4603 fdrop(fp, td); 4604 td->td_retval[0] = indx; 4605 return (error); 4606 } 4607 4608 /* 4609 * Stat an (NFS) file handle. 4610 */ 4611 #ifndef _SYS_SYSPROTO_H_ 4612 struct fhstat_args { 4613 struct fhandle *u_fhp; 4614 struct stat *sb; 4615 }; 4616 #endif 4617 int 4618 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4619 { 4620 struct stat sb; 4621 struct fhandle fh; 4622 int error; 4623 4624 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4625 if (error != 0) 4626 return (error); 4627 error = kern_fhstat(td, fh, &sb); 4628 if (error == 0) 4629 error = copyout(&sb, uap->sb, sizeof(sb)); 4630 return (error); 4631 } 4632 4633 int 4634 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4635 { 4636 struct mount *mp; 4637 struct vnode *vp; 4638 int error; 4639 4640 error = priv_check(td, PRIV_VFS_FHSTAT); 4641 if (error != 0) 4642 return (error); 4643 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4644 return (ESTALE); 4645 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4646 vfs_unbusy(mp); 4647 if (error != 0) 4648 return (error); 4649 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED, td); 4650 vput(vp); 4651 return (error); 4652 } 4653 4654 /* 4655 * Implement fstatfs() for (NFS) file handles. 4656 */ 4657 #ifndef _SYS_SYSPROTO_H_ 4658 struct fhstatfs_args { 4659 struct fhandle *u_fhp; 4660 struct statfs *buf; 4661 }; 4662 #endif 4663 int 4664 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4665 { 4666 struct statfs *sfp; 4667 fhandle_t fh; 4668 int error; 4669 4670 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4671 if (error != 0) 4672 return (error); 4673 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4674 error = kern_fhstatfs(td, fh, sfp); 4675 if (error == 0) 4676 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4677 free(sfp, M_STATFS); 4678 return (error); 4679 } 4680 4681 int 4682 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4683 { 4684 struct mount *mp; 4685 struct vnode *vp; 4686 int error; 4687 4688 error = priv_check(td, PRIV_VFS_FHSTATFS); 4689 if (error != 0) 4690 return (error); 4691 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4692 return (ESTALE); 4693 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4694 if (error != 0) { 4695 vfs_unbusy(mp); 4696 return (error); 4697 } 4698 vput(vp); 4699 error = prison_canseemount(td->td_ucred, mp); 4700 if (error != 0) 4701 goto out; 4702 #ifdef MAC 4703 error = mac_mount_check_stat(td->td_ucred, mp); 4704 if (error != 0) 4705 goto out; 4706 #endif 4707 error = VFS_STATFS(mp, buf); 4708 out: 4709 vfs_unbusy(mp); 4710 return (error); 4711 } 4712 4713 /* 4714 * Unlike madvise(2), we do not make a best effort to remember every 4715 * possible caching hint. Instead, we remember the last setting with 4716 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4717 * region of any current setting. 4718 */ 4719 int 4720 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4721 int advice) 4722 { 4723 struct fadvise_info *fa, *new; 4724 struct file *fp; 4725 struct vnode *vp; 4726 off_t end; 4727 int error; 4728 4729 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4730 return (EINVAL); 4731 AUDIT_ARG_VALUE(advice); 4732 switch (advice) { 4733 case POSIX_FADV_SEQUENTIAL: 4734 case POSIX_FADV_RANDOM: 4735 case POSIX_FADV_NOREUSE: 4736 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4737 break; 4738 case POSIX_FADV_NORMAL: 4739 case POSIX_FADV_WILLNEED: 4740 case POSIX_FADV_DONTNEED: 4741 new = NULL; 4742 break; 4743 default: 4744 return (EINVAL); 4745 } 4746 /* XXX: CAP_POSIX_FADVISE? */ 4747 AUDIT_ARG_FD(fd); 4748 error = fget(td, fd, &cap_no_rights, &fp); 4749 if (error != 0) 4750 goto out; 4751 AUDIT_ARG_FILE(td->td_proc, fp); 4752 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4753 error = ESPIPE; 4754 goto out; 4755 } 4756 if (fp->f_type != DTYPE_VNODE) { 4757 error = ENODEV; 4758 goto out; 4759 } 4760 vp = fp->f_vnode; 4761 if (vp->v_type != VREG) { 4762 error = ENODEV; 4763 goto out; 4764 } 4765 if (len == 0) 4766 end = OFF_MAX; 4767 else 4768 end = offset + len - 1; 4769 switch (advice) { 4770 case POSIX_FADV_SEQUENTIAL: 4771 case POSIX_FADV_RANDOM: 4772 case POSIX_FADV_NOREUSE: 4773 /* 4774 * Try to merge any existing non-standard region with 4775 * this new region if possible, otherwise create a new 4776 * non-standard region for this request. 4777 */ 4778 mtx_pool_lock(mtxpool_sleep, fp); 4779 fa = fp->f_advice; 4780 if (fa != NULL && fa->fa_advice == advice && 4781 ((fa->fa_start <= end && fa->fa_end >= offset) || 4782 (end != OFF_MAX && fa->fa_start == end + 1) || 4783 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4784 if (offset < fa->fa_start) 4785 fa->fa_start = offset; 4786 if (end > fa->fa_end) 4787 fa->fa_end = end; 4788 } else { 4789 new->fa_advice = advice; 4790 new->fa_start = offset; 4791 new->fa_end = end; 4792 fp->f_advice = new; 4793 new = fa; 4794 } 4795 mtx_pool_unlock(mtxpool_sleep, fp); 4796 break; 4797 case POSIX_FADV_NORMAL: 4798 /* 4799 * If a the "normal" region overlaps with an existing 4800 * non-standard region, trim or remove the 4801 * non-standard region. 4802 */ 4803 mtx_pool_lock(mtxpool_sleep, fp); 4804 fa = fp->f_advice; 4805 if (fa != NULL) { 4806 if (offset <= fa->fa_start && end >= fa->fa_end) { 4807 new = fa; 4808 fp->f_advice = NULL; 4809 } else if (offset <= fa->fa_start && 4810 end >= fa->fa_start) 4811 fa->fa_start = end + 1; 4812 else if (offset <= fa->fa_end && end >= fa->fa_end) 4813 fa->fa_end = offset - 1; 4814 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4815 /* 4816 * If the "normal" region is a middle 4817 * portion of the existing 4818 * non-standard region, just remove 4819 * the whole thing rather than picking 4820 * one side or the other to 4821 * preserve. 4822 */ 4823 new = fa; 4824 fp->f_advice = NULL; 4825 } 4826 } 4827 mtx_pool_unlock(mtxpool_sleep, fp); 4828 break; 4829 case POSIX_FADV_WILLNEED: 4830 case POSIX_FADV_DONTNEED: 4831 error = VOP_ADVISE(vp, offset, end, advice); 4832 break; 4833 } 4834 out: 4835 if (fp != NULL) 4836 fdrop(fp, td); 4837 free(new, M_FADVISE); 4838 return (error); 4839 } 4840 4841 int 4842 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4843 { 4844 int error; 4845 4846 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4847 uap->advice); 4848 return (kern_posix_error(td, error)); 4849 } 4850 4851 int 4852 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 4853 off_t *outoffp, size_t len, unsigned int flags) 4854 { 4855 struct file *infp, *outfp; 4856 struct vnode *invp, *outvp; 4857 int error; 4858 size_t retlen; 4859 void *rl_rcookie, *rl_wcookie; 4860 off_t savinoff, savoutoff; 4861 4862 infp = outfp = NULL; 4863 rl_rcookie = rl_wcookie = NULL; 4864 savinoff = -1; 4865 error = 0; 4866 retlen = 0; 4867 4868 if (flags != 0) { 4869 error = EINVAL; 4870 goto out; 4871 } 4872 if (len > SSIZE_MAX) 4873 /* 4874 * Although the len argument is size_t, the return argument 4875 * is ssize_t (which is signed). Therefore a size that won't 4876 * fit in ssize_t can't be returned. 4877 */ 4878 len = SSIZE_MAX; 4879 4880 /* Get the file structures for the file descriptors. */ 4881 error = fget_read(td, infd, &cap_read_rights, &infp); 4882 if (error != 0) 4883 goto out; 4884 if (infp->f_ops == &badfileops) { 4885 error = EBADF; 4886 goto out; 4887 } 4888 if (infp->f_vnode == NULL) { 4889 error = EINVAL; 4890 goto out; 4891 } 4892 error = fget_write(td, outfd, &cap_write_rights, &outfp); 4893 if (error != 0) 4894 goto out; 4895 if (outfp->f_ops == &badfileops) { 4896 error = EBADF; 4897 goto out; 4898 } 4899 if (outfp->f_vnode == NULL) { 4900 error = EINVAL; 4901 goto out; 4902 } 4903 4904 /* Set the offset pointers to the correct place. */ 4905 if (inoffp == NULL) 4906 inoffp = &infp->f_offset; 4907 if (outoffp == NULL) 4908 outoffp = &outfp->f_offset; 4909 savinoff = *inoffp; 4910 savoutoff = *outoffp; 4911 4912 invp = infp->f_vnode; 4913 outvp = outfp->f_vnode; 4914 /* Sanity check the f_flag bits. */ 4915 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 4916 (infp->f_flag & FREAD) == 0) { 4917 error = EBADF; 4918 goto out; 4919 } 4920 4921 /* If len == 0, just return 0. */ 4922 if (len == 0) 4923 goto out; 4924 4925 /* 4926 * If infp and outfp refer to the same file, the byte ranges cannot 4927 * overlap. 4928 */ 4929 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len > 4930 savoutoff) || (savinoff > savoutoff && savoutoff + len > 4931 savinoff))) { 4932 error = EINVAL; 4933 goto out; 4934 } 4935 4936 /* Range lock the byte ranges for both invp and outvp. */ 4937 for (;;) { 4938 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp + 4939 len); 4940 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp + 4941 len); 4942 if (rl_rcookie != NULL) 4943 break; 4944 vn_rangelock_unlock(outvp, rl_wcookie); 4945 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len); 4946 vn_rangelock_unlock(invp, rl_rcookie); 4947 } 4948 4949 retlen = len; 4950 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen, 4951 flags, infp->f_cred, outfp->f_cred, td); 4952 out: 4953 if (rl_rcookie != NULL) 4954 vn_rangelock_unlock(invp, rl_rcookie); 4955 if (rl_wcookie != NULL) 4956 vn_rangelock_unlock(outvp, rl_wcookie); 4957 if (savinoff != -1 && (error == EINTR || error == ERESTART)) { 4958 *inoffp = savinoff; 4959 *outoffp = savoutoff; 4960 } 4961 if (outfp != NULL) 4962 fdrop(outfp, td); 4963 if (infp != NULL) 4964 fdrop(infp, td); 4965 td->td_retval[0] = retlen; 4966 return (error); 4967 } 4968 4969 int 4970 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 4971 { 4972 off_t inoff, outoff, *inoffp, *outoffp; 4973 int error; 4974 4975 inoffp = outoffp = NULL; 4976 if (uap->inoffp != NULL) { 4977 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 4978 if (error != 0) 4979 return (error); 4980 inoffp = &inoff; 4981 } 4982 if (uap->outoffp != NULL) { 4983 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 4984 if (error != 0) 4985 return (error); 4986 outoffp = &outoff; 4987 } 4988 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 4989 outoffp, uap->len, uap->flags); 4990 if (error == 0 && uap->inoffp != NULL) 4991 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 4992 if (error == 0 && uap->outoffp != NULL) 4993 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 4994 return (error); 4995 } 4996