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