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, AT_SYMLINK_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, flag)); 1522 } 1523 1524 int hardlink_check_uid = 0; 1525 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1526 &hardlink_check_uid, 0, 1527 "Unprivileged processes cannot create hard links to files owned by other " 1528 "users"); 1529 static int hardlink_check_gid = 0; 1530 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1531 &hardlink_check_gid, 0, 1532 "Unprivileged processes cannot create hard links to files owned by other " 1533 "groups"); 1534 1535 static int 1536 can_hardlink(struct vnode *vp, struct ucred *cred) 1537 { 1538 struct vattr va; 1539 int error; 1540 1541 if (!hardlink_check_uid && !hardlink_check_gid) 1542 return (0); 1543 1544 error = VOP_GETATTR(vp, &va, cred); 1545 if (error != 0) 1546 return (error); 1547 1548 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1549 error = priv_check_cred(cred, PRIV_VFS_LINK); 1550 if (error != 0) 1551 return (error); 1552 } 1553 1554 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1555 error = priv_check_cred(cred, PRIV_VFS_LINK); 1556 if (error != 0) 1557 return (error); 1558 } 1559 1560 return (0); 1561 } 1562 1563 int 1564 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1565 const char *path2, enum uio_seg segflag, int flag) 1566 { 1567 struct nameidata nd; 1568 int error; 1569 1570 do { 1571 bwillwrite(); 1572 NDINIT_ATRIGHTS(&nd, LOOKUP, AUDITVNODE1 | at2cnpflags(flag, 1573 AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | AT_EMPTY_PATH), 1574 segflag, path1, fd1, &cap_linkat_source_rights, td); 1575 if ((error = namei(&nd)) != 0) 1576 return (error); 1577 NDFREE(&nd, NDF_ONLY_PNBUF); 1578 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) { 1579 error = priv_check(td, PRIV_VFS_FHOPEN); 1580 if (error != 0) { 1581 vrele(nd.ni_vp); 1582 return (error); 1583 } 1584 } 1585 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1586 } while (error == EAGAIN || error == ERELOOKUP); 1587 return (error); 1588 } 1589 1590 static int 1591 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1592 enum uio_seg segflag) 1593 { 1594 struct nameidata nd; 1595 struct mount *mp; 1596 int error; 1597 1598 if (vp->v_type == VDIR) { 1599 vrele(vp); 1600 return (EPERM); /* POSIX */ 1601 } 1602 NDINIT_ATRIGHTS(&nd, CREATE, 1603 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1604 &cap_linkat_target_rights, td); 1605 if ((error = namei(&nd)) == 0) { 1606 if (nd.ni_vp != NULL) { 1607 NDFREE(&nd, NDF_ONLY_PNBUF); 1608 if (nd.ni_dvp == nd.ni_vp) 1609 vrele(nd.ni_dvp); 1610 else 1611 vput(nd.ni_dvp); 1612 vrele(nd.ni_vp); 1613 vrele(vp); 1614 return (EEXIST); 1615 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1616 /* 1617 * Cross-device link. No need to recheck 1618 * vp->v_type, since it cannot change, except 1619 * to VBAD. 1620 */ 1621 NDFREE(&nd, NDF_ONLY_PNBUF); 1622 vput(nd.ni_dvp); 1623 vrele(vp); 1624 return (EXDEV); 1625 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1626 error = can_hardlink(vp, td->td_ucred); 1627 #ifdef MAC 1628 if (error == 0) 1629 error = mac_vnode_check_link(td->td_ucred, 1630 nd.ni_dvp, vp, &nd.ni_cnd); 1631 #endif 1632 if (error != 0) { 1633 vput(vp); 1634 vput(nd.ni_dvp); 1635 NDFREE(&nd, NDF_ONLY_PNBUF); 1636 return (error); 1637 } 1638 error = vn_start_write(vp, &mp, V_NOWAIT); 1639 if (error != 0) { 1640 vput(vp); 1641 vput(nd.ni_dvp); 1642 NDFREE(&nd, NDF_ONLY_PNBUF); 1643 error = vn_start_write(NULL, &mp, 1644 V_XSLEEP | PCATCH); 1645 if (error != 0) 1646 return (error); 1647 return (EAGAIN); 1648 } 1649 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1650 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true); 1651 vn_finished_write(mp); 1652 NDFREE(&nd, NDF_ONLY_PNBUF); 1653 vp = NULL; 1654 } else { 1655 vput(nd.ni_dvp); 1656 NDFREE(&nd, NDF_ONLY_PNBUF); 1657 vrele(vp); 1658 return (EAGAIN); 1659 } 1660 } 1661 if (vp != NULL) 1662 vrele(vp); 1663 return (error); 1664 } 1665 1666 /* 1667 * Make a symbolic link. 1668 */ 1669 #ifndef _SYS_SYSPROTO_H_ 1670 struct symlink_args { 1671 char *path; 1672 char *link; 1673 }; 1674 #endif 1675 int 1676 sys_symlink(struct thread *td, struct symlink_args *uap) 1677 { 1678 1679 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1680 UIO_USERSPACE)); 1681 } 1682 1683 #ifndef _SYS_SYSPROTO_H_ 1684 struct symlinkat_args { 1685 char *path; 1686 int fd; 1687 char *path2; 1688 }; 1689 #endif 1690 int 1691 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1692 { 1693 1694 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1695 UIO_USERSPACE)); 1696 } 1697 1698 int 1699 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1700 enum uio_seg segflg) 1701 { 1702 struct mount *mp; 1703 struct vattr vattr; 1704 const char *syspath; 1705 char *tmppath; 1706 struct nameidata nd; 1707 int error; 1708 1709 if (segflg == UIO_SYSSPACE) { 1710 syspath = path1; 1711 } else { 1712 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1713 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1714 goto out; 1715 syspath = tmppath; 1716 } 1717 AUDIT_ARG_TEXT(syspath); 1718 restart: 1719 bwillwrite(); 1720 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1721 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1722 td); 1723 if ((error = namei(&nd)) != 0) 1724 goto out; 1725 if (nd.ni_vp) { 1726 NDFREE(&nd, NDF_ONLY_PNBUF); 1727 if (nd.ni_vp == nd.ni_dvp) 1728 vrele(nd.ni_dvp); 1729 else 1730 vput(nd.ni_dvp); 1731 vrele(nd.ni_vp); 1732 nd.ni_vp = NULL; 1733 error = EEXIST; 1734 goto out; 1735 } 1736 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1737 NDFREE(&nd, NDF_ONLY_PNBUF); 1738 vput(nd.ni_dvp); 1739 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1740 goto out; 1741 goto restart; 1742 } 1743 VATTR_NULL(&vattr); 1744 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask; 1745 #ifdef MAC 1746 vattr.va_type = VLNK; 1747 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1748 &vattr); 1749 if (error != 0) 1750 goto out2; 1751 #endif 1752 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1753 #ifdef MAC 1754 out2: 1755 #endif 1756 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1757 vn_finished_write(mp); 1758 NDFREE(&nd, NDF_ONLY_PNBUF); 1759 if (error == ERELOOKUP) 1760 goto restart; 1761 out: 1762 if (segflg != UIO_SYSSPACE) 1763 uma_zfree(namei_zone, tmppath); 1764 return (error); 1765 } 1766 1767 /* 1768 * Delete a whiteout from the filesystem. 1769 */ 1770 #ifndef _SYS_SYSPROTO_H_ 1771 struct undelete_args { 1772 char *path; 1773 }; 1774 #endif 1775 int 1776 sys_undelete(struct thread *td, struct undelete_args *uap) 1777 { 1778 struct mount *mp; 1779 struct nameidata nd; 1780 int error; 1781 1782 restart: 1783 bwillwrite(); 1784 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1785 UIO_USERSPACE, uap->path, td); 1786 error = namei(&nd); 1787 if (error != 0) 1788 return (error); 1789 1790 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1791 NDFREE(&nd, NDF_ONLY_PNBUF); 1792 if (nd.ni_vp == nd.ni_dvp) 1793 vrele(nd.ni_dvp); 1794 else 1795 vput(nd.ni_dvp); 1796 if (nd.ni_vp) 1797 vrele(nd.ni_vp); 1798 return (EEXIST); 1799 } 1800 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1801 NDFREE(&nd, NDF_ONLY_PNBUF); 1802 vput(nd.ni_dvp); 1803 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1804 return (error); 1805 goto restart; 1806 } 1807 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1808 NDFREE(&nd, NDF_ONLY_PNBUF); 1809 vput(nd.ni_dvp); 1810 vn_finished_write(mp); 1811 if (error == ERELOOKUP) 1812 goto restart; 1813 return (error); 1814 } 1815 1816 /* 1817 * Delete a name from the filesystem. 1818 */ 1819 #ifndef _SYS_SYSPROTO_H_ 1820 struct unlink_args { 1821 char *path; 1822 }; 1823 #endif 1824 int 1825 sys_unlink(struct thread *td, struct unlink_args *uap) 1826 { 1827 1828 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1829 0, 0)); 1830 } 1831 1832 static int 1833 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1834 int flag, enum uio_seg pathseg, ino_t oldinum) 1835 { 1836 1837 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0) 1838 return (EINVAL); 1839 1840 if ((flag & AT_REMOVEDIR) != 0) 1841 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1842 1843 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1844 } 1845 1846 #ifndef _SYS_SYSPROTO_H_ 1847 struct unlinkat_args { 1848 int fd; 1849 char *path; 1850 int flag; 1851 }; 1852 #endif 1853 int 1854 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1855 { 1856 1857 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1858 UIO_USERSPACE, 0)); 1859 } 1860 1861 #ifndef _SYS_SYSPROTO_H_ 1862 struct funlinkat_args { 1863 int dfd; 1864 const char *path; 1865 int fd; 1866 int flag; 1867 }; 1868 #endif 1869 int 1870 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 1871 { 1872 1873 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 1874 UIO_USERSPACE, 0)); 1875 } 1876 1877 int 1878 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 1879 enum uio_seg pathseg, int flag, ino_t oldinum) 1880 { 1881 struct mount *mp; 1882 struct file *fp; 1883 struct vnode *vp; 1884 struct nameidata nd; 1885 struct stat sb; 1886 int error; 1887 1888 fp = NULL; 1889 if (fd != FD_NONE) { 1890 error = getvnode_path(td, fd, &cap_no_rights, &fp); 1891 if (error != 0) 1892 return (error); 1893 } 1894 1895 restart: 1896 bwillwrite(); 1897 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1898 at2cnpflags(flag, AT_RESOLVE_BENEATH), 1899 pathseg, path, dfd, &cap_unlinkat_rights, td); 1900 if ((error = namei(&nd)) != 0) { 1901 if (error == EINVAL) 1902 error = EPERM; 1903 goto fdout; 1904 } 1905 vp = nd.ni_vp; 1906 if (vp->v_type == VDIR && oldinum == 0) { 1907 error = EPERM; /* POSIX */ 1908 } else if (oldinum != 0 && 1909 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1910 sb.st_ino != oldinum) { 1911 error = EIDRM; /* Identifier removed */ 1912 } else if (fp != NULL && fp->f_vnode != vp) { 1913 if (VN_IS_DOOMED(fp->f_vnode)) 1914 error = EBADF; 1915 else 1916 error = EDEADLK; 1917 } else { 1918 /* 1919 * The root of a mounted filesystem cannot be deleted. 1920 * 1921 * XXX: can this only be a VDIR case? 1922 */ 1923 if (vp->v_vflag & VV_ROOT) 1924 error = EBUSY; 1925 } 1926 if (error == 0) { 1927 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1928 NDFREE(&nd, NDF_ONLY_PNBUF); 1929 vput(nd.ni_dvp); 1930 if (vp == nd.ni_dvp) 1931 vrele(vp); 1932 else 1933 vput(vp); 1934 if ((error = vn_start_write(NULL, &mp, 1935 V_XSLEEP | PCATCH)) != 0) { 1936 goto fdout; 1937 } 1938 goto restart; 1939 } 1940 #ifdef MAC 1941 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1942 &nd.ni_cnd); 1943 if (error != 0) 1944 goto out; 1945 #endif 1946 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1947 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1948 #ifdef MAC 1949 out: 1950 #endif 1951 vn_finished_write(mp); 1952 } 1953 NDFREE(&nd, NDF_ONLY_PNBUF); 1954 vput(nd.ni_dvp); 1955 if (vp == nd.ni_dvp) 1956 vrele(vp); 1957 else 1958 vput(vp); 1959 if (error == ERELOOKUP) 1960 goto restart; 1961 fdout: 1962 if (fp != NULL) 1963 fdrop(fp, td); 1964 return (error); 1965 } 1966 1967 /* 1968 * Reposition read/write file offset. 1969 */ 1970 #ifndef _SYS_SYSPROTO_H_ 1971 struct lseek_args { 1972 int fd; 1973 int pad; 1974 off_t offset; 1975 int whence; 1976 }; 1977 #endif 1978 int 1979 sys_lseek(struct thread *td, struct lseek_args *uap) 1980 { 1981 1982 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1983 } 1984 1985 int 1986 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1987 { 1988 struct file *fp; 1989 int error; 1990 1991 AUDIT_ARG_FD(fd); 1992 error = fget(td, fd, &cap_seek_rights, &fp); 1993 if (error != 0) 1994 return (error); 1995 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1996 fo_seek(fp, offset, whence, td) : ESPIPE; 1997 fdrop(fp, td); 1998 return (error); 1999 } 2000 2001 #if defined(COMPAT_43) 2002 /* 2003 * Reposition read/write file offset. 2004 */ 2005 #ifndef _SYS_SYSPROTO_H_ 2006 struct olseek_args { 2007 int fd; 2008 long offset; 2009 int whence; 2010 }; 2011 #endif 2012 int 2013 olseek(struct thread *td, struct olseek_args *uap) 2014 { 2015 2016 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2017 } 2018 #endif /* COMPAT_43 */ 2019 2020 #if defined(COMPAT_FREEBSD6) 2021 /* Version with the 'pad' argument */ 2022 int 2023 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 2024 { 2025 2026 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2027 } 2028 #endif 2029 2030 /* 2031 * Check access permissions using passed credentials. 2032 */ 2033 static int 2034 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 2035 struct thread *td) 2036 { 2037 accmode_t accmode; 2038 int error; 2039 2040 /* Flags == 0 means only check for existence. */ 2041 if (user_flags == 0) 2042 return (0); 2043 2044 accmode = 0; 2045 if (user_flags & R_OK) 2046 accmode |= VREAD; 2047 if (user_flags & W_OK) 2048 accmode |= VWRITE; 2049 if (user_flags & X_OK) 2050 accmode |= VEXEC; 2051 #ifdef MAC 2052 error = mac_vnode_check_access(cred, vp, accmode); 2053 if (error != 0) 2054 return (error); 2055 #endif 2056 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 2057 error = VOP_ACCESS(vp, accmode, cred, td); 2058 return (error); 2059 } 2060 2061 /* 2062 * Check access permissions using "real" credentials. 2063 */ 2064 #ifndef _SYS_SYSPROTO_H_ 2065 struct access_args { 2066 char *path; 2067 int amode; 2068 }; 2069 #endif 2070 int 2071 sys_access(struct thread *td, struct access_args *uap) 2072 { 2073 2074 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2075 0, uap->amode)); 2076 } 2077 2078 #ifndef _SYS_SYSPROTO_H_ 2079 struct faccessat_args { 2080 int dirfd; 2081 char *path; 2082 int amode; 2083 int flag; 2084 } 2085 #endif 2086 int 2087 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2088 { 2089 2090 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2091 uap->amode)); 2092 } 2093 2094 int 2095 kern_accessat(struct thread *td, int fd, const char *path, 2096 enum uio_seg pathseg, int flag, int amode) 2097 { 2098 struct ucred *cred, *usecred; 2099 struct vnode *vp; 2100 struct nameidata nd; 2101 int error; 2102 2103 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH)) != 0) 2104 return (EINVAL); 2105 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2106 return (EINVAL); 2107 2108 /* 2109 * Create and modify a temporary credential instead of one that 2110 * is potentially shared (if we need one). 2111 */ 2112 cred = td->td_ucred; 2113 if ((flag & AT_EACCESS) == 0 && 2114 ((cred->cr_uid != cred->cr_ruid || 2115 cred->cr_rgid != cred->cr_groups[0]))) { 2116 usecred = crdup(cred); 2117 usecred->cr_uid = cred->cr_ruid; 2118 usecred->cr_groups[0] = cred->cr_rgid; 2119 td->td_ucred = usecred; 2120 } else 2121 usecred = cred; 2122 AUDIT_ARG_VALUE(amode); 2123 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2124 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | 2125 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights, td); 2126 if ((error = namei(&nd)) != 0) 2127 goto out; 2128 vp = nd.ni_vp; 2129 2130 error = vn_access(vp, amode, usecred, td); 2131 NDFREE_NOTHING(&nd); 2132 vput(vp); 2133 out: 2134 if (usecred != cred) { 2135 td->td_ucred = cred; 2136 crfree(usecred); 2137 } 2138 return (error); 2139 } 2140 2141 /* 2142 * Check access permissions using "effective" credentials. 2143 */ 2144 #ifndef _SYS_SYSPROTO_H_ 2145 struct eaccess_args { 2146 char *path; 2147 int amode; 2148 }; 2149 #endif 2150 int 2151 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2152 { 2153 2154 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2155 AT_EACCESS, uap->amode)); 2156 } 2157 2158 #if defined(COMPAT_43) 2159 /* 2160 * Get file status; this version follows links. 2161 */ 2162 #ifndef _SYS_SYSPROTO_H_ 2163 struct ostat_args { 2164 char *path; 2165 struct ostat *ub; 2166 }; 2167 #endif 2168 int 2169 ostat(struct thread *td, struct ostat_args *uap) 2170 { 2171 struct stat sb; 2172 struct ostat osb; 2173 int error; 2174 2175 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2176 &sb, NULL); 2177 if (error != 0) 2178 return (error); 2179 cvtstat(&sb, &osb); 2180 return (copyout(&osb, uap->ub, sizeof (osb))); 2181 } 2182 2183 /* 2184 * Get file status; this version does not follow links. 2185 */ 2186 #ifndef _SYS_SYSPROTO_H_ 2187 struct olstat_args { 2188 char *path; 2189 struct ostat *ub; 2190 }; 2191 #endif 2192 int 2193 olstat(struct thread *td, struct olstat_args *uap) 2194 { 2195 struct stat sb; 2196 struct ostat osb; 2197 int error; 2198 2199 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2200 UIO_USERSPACE, &sb, NULL); 2201 if (error != 0) 2202 return (error); 2203 cvtstat(&sb, &osb); 2204 return (copyout(&osb, uap->ub, sizeof (osb))); 2205 } 2206 2207 /* 2208 * Convert from an old to a new stat structure. 2209 * XXX: many values are blindly truncated. 2210 */ 2211 void 2212 cvtstat(struct stat *st, struct ostat *ost) 2213 { 2214 2215 bzero(ost, sizeof(*ost)); 2216 ost->st_dev = st->st_dev; 2217 ost->st_ino = st->st_ino; 2218 ost->st_mode = st->st_mode; 2219 ost->st_nlink = st->st_nlink; 2220 ost->st_uid = st->st_uid; 2221 ost->st_gid = st->st_gid; 2222 ost->st_rdev = st->st_rdev; 2223 ost->st_size = MIN(st->st_size, INT32_MAX); 2224 ost->st_atim = st->st_atim; 2225 ost->st_mtim = st->st_mtim; 2226 ost->st_ctim = st->st_ctim; 2227 ost->st_blksize = st->st_blksize; 2228 ost->st_blocks = st->st_blocks; 2229 ost->st_flags = st->st_flags; 2230 ost->st_gen = st->st_gen; 2231 } 2232 #endif /* COMPAT_43 */ 2233 2234 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2235 int ino64_trunc_error; 2236 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2237 &ino64_trunc_error, 0, 2238 "Error on truncation of device, file or inode number, or link count"); 2239 2240 int 2241 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2242 { 2243 2244 ost->st_dev = st->st_dev; 2245 if (ost->st_dev != st->st_dev) { 2246 switch (ino64_trunc_error) { 2247 default: 2248 /* 2249 * Since dev_t is almost raw, don't clamp to the 2250 * maximum for case 2, but ignore the error. 2251 */ 2252 break; 2253 case 1: 2254 return (EOVERFLOW); 2255 } 2256 } 2257 ost->st_ino = st->st_ino; 2258 if (ost->st_ino != st->st_ino) { 2259 switch (ino64_trunc_error) { 2260 default: 2261 case 0: 2262 break; 2263 case 1: 2264 return (EOVERFLOW); 2265 case 2: 2266 ost->st_ino = UINT32_MAX; 2267 break; 2268 } 2269 } 2270 ost->st_mode = st->st_mode; 2271 ost->st_nlink = st->st_nlink; 2272 if (ost->st_nlink != st->st_nlink) { 2273 switch (ino64_trunc_error) { 2274 default: 2275 case 0: 2276 break; 2277 case 1: 2278 return (EOVERFLOW); 2279 case 2: 2280 ost->st_nlink = UINT16_MAX; 2281 break; 2282 } 2283 } 2284 ost->st_uid = st->st_uid; 2285 ost->st_gid = st->st_gid; 2286 ost->st_rdev = st->st_rdev; 2287 if (ost->st_rdev != st->st_rdev) { 2288 switch (ino64_trunc_error) { 2289 default: 2290 break; 2291 case 1: 2292 return (EOVERFLOW); 2293 } 2294 } 2295 ost->st_atim = st->st_atim; 2296 ost->st_mtim = st->st_mtim; 2297 ost->st_ctim = st->st_ctim; 2298 ost->st_size = st->st_size; 2299 ost->st_blocks = st->st_blocks; 2300 ost->st_blksize = st->st_blksize; 2301 ost->st_flags = st->st_flags; 2302 ost->st_gen = st->st_gen; 2303 ost->st_lspare = 0; 2304 ost->st_birthtim = st->st_birthtim; 2305 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2306 sizeof(*ost) - offsetof(struct freebsd11_stat, 2307 st_birthtim) - sizeof(ost->st_birthtim)); 2308 return (0); 2309 } 2310 2311 int 2312 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2313 { 2314 struct stat sb; 2315 struct freebsd11_stat osb; 2316 int error; 2317 2318 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2319 &sb, NULL); 2320 if (error != 0) 2321 return (error); 2322 error = freebsd11_cvtstat(&sb, &osb); 2323 if (error == 0) 2324 error = copyout(&osb, uap->ub, sizeof(osb)); 2325 return (error); 2326 } 2327 2328 int 2329 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2330 { 2331 struct stat sb; 2332 struct freebsd11_stat osb; 2333 int error; 2334 2335 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2336 UIO_USERSPACE, &sb, NULL); 2337 if (error != 0) 2338 return (error); 2339 error = freebsd11_cvtstat(&sb, &osb); 2340 if (error == 0) 2341 error = copyout(&osb, uap->ub, sizeof(osb)); 2342 return (error); 2343 } 2344 2345 int 2346 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2347 { 2348 struct fhandle fh; 2349 struct stat sb; 2350 struct freebsd11_stat osb; 2351 int error; 2352 2353 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2354 if (error != 0) 2355 return (error); 2356 error = kern_fhstat(td, fh, &sb); 2357 if (error != 0) 2358 return (error); 2359 error = freebsd11_cvtstat(&sb, &osb); 2360 if (error == 0) 2361 error = copyout(&osb, uap->sb, sizeof(osb)); 2362 return (error); 2363 } 2364 2365 int 2366 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2367 { 2368 struct stat sb; 2369 struct freebsd11_stat osb; 2370 int error; 2371 2372 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2373 UIO_USERSPACE, &sb, NULL); 2374 if (error != 0) 2375 return (error); 2376 error = freebsd11_cvtstat(&sb, &osb); 2377 if (error == 0) 2378 error = copyout(&osb, uap->buf, sizeof(osb)); 2379 return (error); 2380 } 2381 #endif /* COMPAT_FREEBSD11 */ 2382 2383 /* 2384 * Get file status 2385 */ 2386 #ifndef _SYS_SYSPROTO_H_ 2387 struct fstatat_args { 2388 int fd; 2389 char *path; 2390 struct stat *buf; 2391 int flag; 2392 } 2393 #endif 2394 int 2395 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2396 { 2397 struct stat sb; 2398 int error; 2399 2400 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2401 UIO_USERSPACE, &sb, NULL); 2402 if (error == 0) 2403 error = copyout(&sb, uap->buf, sizeof (sb)); 2404 return (error); 2405 } 2406 2407 int 2408 kern_statat(struct thread *td, int flag, int fd, const char *path, 2409 enum uio_seg pathseg, struct stat *sbp, 2410 void (*hook)(struct vnode *vp, struct stat *sbp)) 2411 { 2412 struct nameidata nd; 2413 int error; 2414 2415 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2416 AT_EMPTY_PATH)) != 0) 2417 return (EINVAL); 2418 2419 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH | 2420 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF | 2421 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, td); 2422 2423 if ((error = namei(&nd)) != 0) 2424 return (error); 2425 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED, td); 2426 if (error == 0) { 2427 if (__predict_false(hook != NULL)) 2428 hook(nd.ni_vp, sbp); 2429 } 2430 NDFREE_NOTHING(&nd); 2431 vput(nd.ni_vp); 2432 #ifdef __STAT_TIME_T_EXT 2433 sbp->st_atim_ext = 0; 2434 sbp->st_mtim_ext = 0; 2435 sbp->st_ctim_ext = 0; 2436 sbp->st_btim_ext = 0; 2437 #endif 2438 #ifdef KTRACE 2439 if (KTRPOINT(td, KTR_STRUCT)) 2440 ktrstat_error(sbp, error); 2441 #endif 2442 return (error); 2443 } 2444 2445 #if defined(COMPAT_FREEBSD11) 2446 /* 2447 * Implementation of the NetBSD [l]stat() functions. 2448 */ 2449 void 2450 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2451 { 2452 2453 bzero(nsb, sizeof(*nsb)); 2454 nsb->st_dev = sb->st_dev; 2455 nsb->st_ino = sb->st_ino; 2456 nsb->st_mode = sb->st_mode; 2457 nsb->st_nlink = sb->st_nlink; 2458 nsb->st_uid = sb->st_uid; 2459 nsb->st_gid = sb->st_gid; 2460 nsb->st_rdev = sb->st_rdev; 2461 nsb->st_atim = sb->st_atim; 2462 nsb->st_mtim = sb->st_mtim; 2463 nsb->st_ctim = sb->st_ctim; 2464 nsb->st_size = sb->st_size; 2465 nsb->st_blocks = sb->st_blocks; 2466 nsb->st_blksize = sb->st_blksize; 2467 nsb->st_flags = sb->st_flags; 2468 nsb->st_gen = sb->st_gen; 2469 nsb->st_birthtim = sb->st_birthtim; 2470 } 2471 2472 #ifndef _SYS_SYSPROTO_H_ 2473 struct freebsd11_nstat_args { 2474 char *path; 2475 struct nstat *ub; 2476 }; 2477 #endif 2478 int 2479 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2480 { 2481 struct stat sb; 2482 struct nstat nsb; 2483 int error; 2484 2485 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2486 &sb, NULL); 2487 if (error != 0) 2488 return (error); 2489 freebsd11_cvtnstat(&sb, &nsb); 2490 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2491 } 2492 2493 /* 2494 * NetBSD lstat. Get file status; this version does not follow links. 2495 */ 2496 #ifndef _SYS_SYSPROTO_H_ 2497 struct freebsd11_nlstat_args { 2498 char *path; 2499 struct nstat *ub; 2500 }; 2501 #endif 2502 int 2503 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2504 { 2505 struct stat sb; 2506 struct nstat nsb; 2507 int error; 2508 2509 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2510 UIO_USERSPACE, &sb, NULL); 2511 if (error != 0) 2512 return (error); 2513 freebsd11_cvtnstat(&sb, &nsb); 2514 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2515 } 2516 #endif /* COMPAT_FREEBSD11 */ 2517 2518 /* 2519 * Get configurable pathname variables. 2520 */ 2521 #ifndef _SYS_SYSPROTO_H_ 2522 struct pathconf_args { 2523 char *path; 2524 int name; 2525 }; 2526 #endif 2527 int 2528 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2529 { 2530 long value; 2531 int error; 2532 2533 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2534 &value); 2535 if (error == 0) 2536 td->td_retval[0] = value; 2537 return (error); 2538 } 2539 2540 #ifndef _SYS_SYSPROTO_H_ 2541 struct lpathconf_args { 2542 char *path; 2543 int name; 2544 }; 2545 #endif 2546 int 2547 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2548 { 2549 long value; 2550 int error; 2551 2552 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2553 NOFOLLOW, &value); 2554 if (error == 0) 2555 td->td_retval[0] = value; 2556 return (error); 2557 } 2558 2559 int 2560 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2561 int name, u_long flags, long *valuep) 2562 { 2563 struct nameidata nd; 2564 int error; 2565 2566 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2567 pathseg, path, td); 2568 if ((error = namei(&nd)) != 0) 2569 return (error); 2570 NDFREE_NOTHING(&nd); 2571 2572 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2573 vput(nd.ni_vp); 2574 return (error); 2575 } 2576 2577 /* 2578 * Return target name of a symbolic link. 2579 */ 2580 #ifndef _SYS_SYSPROTO_H_ 2581 struct readlink_args { 2582 char *path; 2583 char *buf; 2584 size_t count; 2585 }; 2586 #endif 2587 int 2588 sys_readlink(struct thread *td, struct readlink_args *uap) 2589 { 2590 2591 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2592 uap->buf, UIO_USERSPACE, uap->count)); 2593 } 2594 #ifndef _SYS_SYSPROTO_H_ 2595 struct readlinkat_args { 2596 int fd; 2597 char *path; 2598 char *buf; 2599 size_t bufsize; 2600 }; 2601 #endif 2602 int 2603 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2604 { 2605 2606 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2607 uap->buf, UIO_USERSPACE, uap->bufsize)); 2608 } 2609 2610 int 2611 kern_readlinkat(struct thread *td, int fd, const char *path, 2612 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2613 { 2614 struct vnode *vp; 2615 struct nameidata nd; 2616 int error; 2617 2618 if (count > IOSIZE_MAX) 2619 return (EINVAL); 2620 2621 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2622 pathseg, path, fd, td); 2623 2624 if ((error = namei(&nd)) != 0) 2625 return (error); 2626 NDFREE_NOTHING(&nd); 2627 vp = nd.ni_vp; 2628 2629 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2630 vput(vp); 2631 2632 return (error); 2633 } 2634 2635 /* 2636 * Helper function to readlink from a vnode 2637 */ 2638 static int 2639 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2640 struct thread *td) 2641 { 2642 struct iovec aiov; 2643 struct uio auio; 2644 int error; 2645 2646 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2647 #ifdef MAC 2648 error = mac_vnode_check_readlink(td->td_ucred, vp); 2649 if (error != 0) 2650 return (error); 2651 #endif 2652 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2653 return (EINVAL); 2654 2655 aiov.iov_base = buf; 2656 aiov.iov_len = count; 2657 auio.uio_iov = &aiov; 2658 auio.uio_iovcnt = 1; 2659 auio.uio_offset = 0; 2660 auio.uio_rw = UIO_READ; 2661 auio.uio_segflg = bufseg; 2662 auio.uio_td = td; 2663 auio.uio_resid = count; 2664 error = VOP_READLINK(vp, &auio, td->td_ucred); 2665 td->td_retval[0] = count - auio.uio_resid; 2666 return (error); 2667 } 2668 2669 /* 2670 * Common implementation code for chflags() and fchflags(). 2671 */ 2672 static int 2673 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2674 { 2675 struct mount *mp; 2676 struct vattr vattr; 2677 int error; 2678 2679 /* We can't support the value matching VNOVAL. */ 2680 if (flags == VNOVAL) 2681 return (EOPNOTSUPP); 2682 2683 /* 2684 * Prevent non-root users from setting flags on devices. When 2685 * a device is reused, users can retain ownership of the device 2686 * if they are allowed to set flags and programs assume that 2687 * chown can't fail when done as root. 2688 */ 2689 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2690 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2691 if (error != 0) 2692 return (error); 2693 } 2694 2695 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2696 return (error); 2697 VATTR_NULL(&vattr); 2698 vattr.va_flags = flags; 2699 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2700 #ifdef MAC 2701 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2702 if (error == 0) 2703 #endif 2704 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2705 VOP_UNLOCK(vp); 2706 vn_finished_write(mp); 2707 return (error); 2708 } 2709 2710 /* 2711 * Change flags of a file given a path name. 2712 */ 2713 #ifndef _SYS_SYSPROTO_H_ 2714 struct chflags_args { 2715 const char *path; 2716 u_long flags; 2717 }; 2718 #endif 2719 int 2720 sys_chflags(struct thread *td, struct chflags_args *uap) 2721 { 2722 2723 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2724 uap->flags, 0)); 2725 } 2726 2727 #ifndef _SYS_SYSPROTO_H_ 2728 struct chflagsat_args { 2729 int fd; 2730 const char *path; 2731 u_long flags; 2732 int atflag; 2733 } 2734 #endif 2735 int 2736 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2737 { 2738 2739 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2740 AT_EMPTY_PATH)) != 0) 2741 return (EINVAL); 2742 2743 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2744 uap->flags, uap->atflag)); 2745 } 2746 2747 /* 2748 * Same as chflags() but doesn't follow symlinks. 2749 */ 2750 #ifndef _SYS_SYSPROTO_H_ 2751 struct lchflags_args { 2752 const char *path; 2753 u_long flags; 2754 }; 2755 #endif 2756 int 2757 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2758 { 2759 2760 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2761 uap->flags, AT_SYMLINK_NOFOLLOW)); 2762 } 2763 2764 static int 2765 kern_chflagsat(struct thread *td, int fd, const char *path, 2766 enum uio_seg pathseg, u_long flags, int atflag) 2767 { 2768 struct nameidata nd; 2769 int error; 2770 2771 AUDIT_ARG_FFLAGS(flags); 2772 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW | 2773 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2774 fd, &cap_fchflags_rights, td); 2775 if ((error = namei(&nd)) != 0) 2776 return (error); 2777 NDFREE_NOTHING(&nd); 2778 error = setfflags(td, nd.ni_vp, flags); 2779 vrele(nd.ni_vp); 2780 return (error); 2781 } 2782 2783 /* 2784 * Change flags of a file given a file descriptor. 2785 */ 2786 #ifndef _SYS_SYSPROTO_H_ 2787 struct fchflags_args { 2788 int fd; 2789 u_long flags; 2790 }; 2791 #endif 2792 int 2793 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2794 { 2795 struct file *fp; 2796 int error; 2797 2798 AUDIT_ARG_FD(uap->fd); 2799 AUDIT_ARG_FFLAGS(uap->flags); 2800 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2801 &fp); 2802 if (error != 0) 2803 return (error); 2804 #ifdef AUDIT 2805 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2806 AUDIT_ARG_VNODE1(fp->f_vnode); 2807 VOP_UNLOCK(fp->f_vnode); 2808 #endif 2809 error = setfflags(td, fp->f_vnode, uap->flags); 2810 fdrop(fp, td); 2811 return (error); 2812 } 2813 2814 /* 2815 * Common implementation code for chmod(), lchmod() and fchmod(). 2816 */ 2817 int 2818 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2819 { 2820 struct mount *mp; 2821 struct vattr vattr; 2822 int error; 2823 2824 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2825 return (error); 2826 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2827 VATTR_NULL(&vattr); 2828 vattr.va_mode = mode & ALLPERMS; 2829 #ifdef MAC 2830 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2831 if (error == 0) 2832 #endif 2833 error = VOP_SETATTR(vp, &vattr, cred); 2834 VOP_UNLOCK(vp); 2835 vn_finished_write(mp); 2836 return (error); 2837 } 2838 2839 /* 2840 * Change mode of a file given path name. 2841 */ 2842 #ifndef _SYS_SYSPROTO_H_ 2843 struct chmod_args { 2844 char *path; 2845 int mode; 2846 }; 2847 #endif 2848 int 2849 sys_chmod(struct thread *td, struct chmod_args *uap) 2850 { 2851 2852 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2853 uap->mode, 0)); 2854 } 2855 2856 #ifndef _SYS_SYSPROTO_H_ 2857 struct fchmodat_args { 2858 int dirfd; 2859 char *path; 2860 mode_t mode; 2861 int flag; 2862 } 2863 #endif 2864 int 2865 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2866 { 2867 2868 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2869 AT_EMPTY_PATH)) != 0) 2870 return (EINVAL); 2871 2872 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2873 uap->mode, uap->flag)); 2874 } 2875 2876 /* 2877 * Change mode of a file given path name (don't follow links.) 2878 */ 2879 #ifndef _SYS_SYSPROTO_H_ 2880 struct lchmod_args { 2881 char *path; 2882 int mode; 2883 }; 2884 #endif 2885 int 2886 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2887 { 2888 2889 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2890 uap->mode, AT_SYMLINK_NOFOLLOW)); 2891 } 2892 2893 int 2894 kern_fchmodat(struct thread *td, int fd, const char *path, 2895 enum uio_seg pathseg, mode_t mode, int flag) 2896 { 2897 struct nameidata nd; 2898 int error; 2899 2900 AUDIT_ARG_MODE(mode); 2901 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 2902 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2903 fd, &cap_fchmod_rights, td); 2904 if ((error = namei(&nd)) != 0) 2905 return (error); 2906 NDFREE_NOTHING(&nd); 2907 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2908 vrele(nd.ni_vp); 2909 return (error); 2910 } 2911 2912 /* 2913 * Change mode of a file given a file descriptor. 2914 */ 2915 #ifndef _SYS_SYSPROTO_H_ 2916 struct fchmod_args { 2917 int fd; 2918 int mode; 2919 }; 2920 #endif 2921 int 2922 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2923 { 2924 struct file *fp; 2925 int error; 2926 2927 AUDIT_ARG_FD(uap->fd); 2928 AUDIT_ARG_MODE(uap->mode); 2929 2930 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2931 if (error != 0) 2932 return (error); 2933 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2934 fdrop(fp, td); 2935 return (error); 2936 } 2937 2938 /* 2939 * Common implementation for chown(), lchown(), and fchown() 2940 */ 2941 int 2942 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2943 gid_t gid) 2944 { 2945 struct mount *mp; 2946 struct vattr vattr; 2947 int error; 2948 2949 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2950 return (error); 2951 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2952 VATTR_NULL(&vattr); 2953 vattr.va_uid = uid; 2954 vattr.va_gid = gid; 2955 #ifdef MAC 2956 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2957 vattr.va_gid); 2958 if (error == 0) 2959 #endif 2960 error = VOP_SETATTR(vp, &vattr, cred); 2961 VOP_UNLOCK(vp); 2962 vn_finished_write(mp); 2963 return (error); 2964 } 2965 2966 /* 2967 * Set ownership given a path name. 2968 */ 2969 #ifndef _SYS_SYSPROTO_H_ 2970 struct chown_args { 2971 char *path; 2972 int uid; 2973 int gid; 2974 }; 2975 #endif 2976 int 2977 sys_chown(struct thread *td, struct chown_args *uap) 2978 { 2979 2980 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2981 uap->gid, 0)); 2982 } 2983 2984 #ifndef _SYS_SYSPROTO_H_ 2985 struct fchownat_args { 2986 int fd; 2987 const char * path; 2988 uid_t uid; 2989 gid_t gid; 2990 int flag; 2991 }; 2992 #endif 2993 int 2994 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2995 { 2996 2997 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2998 AT_EMPTY_PATH)) != 0) 2999 return (EINVAL); 3000 3001 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 3002 uap->gid, uap->flag)); 3003 } 3004 3005 int 3006 kern_fchownat(struct thread *td, int fd, const char *path, 3007 enum uio_seg pathseg, int uid, int gid, int flag) 3008 { 3009 struct nameidata nd; 3010 int error; 3011 3012 AUDIT_ARG_OWNER(uid, gid); 3013 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3014 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3015 fd, &cap_fchown_rights, td); 3016 3017 if ((error = namei(&nd)) != 0) 3018 return (error); 3019 NDFREE_NOTHING(&nd); 3020 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 3021 vrele(nd.ni_vp); 3022 return (error); 3023 } 3024 3025 /* 3026 * Set ownership given a path name, do not cross symlinks. 3027 */ 3028 #ifndef _SYS_SYSPROTO_H_ 3029 struct lchown_args { 3030 char *path; 3031 int uid; 3032 int gid; 3033 }; 3034 #endif 3035 int 3036 sys_lchown(struct thread *td, struct lchown_args *uap) 3037 { 3038 3039 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3040 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 3041 } 3042 3043 /* 3044 * Set ownership given a file descriptor. 3045 */ 3046 #ifndef _SYS_SYSPROTO_H_ 3047 struct fchown_args { 3048 int fd; 3049 int uid; 3050 int gid; 3051 }; 3052 #endif 3053 int 3054 sys_fchown(struct thread *td, struct fchown_args *uap) 3055 { 3056 struct file *fp; 3057 int error; 3058 3059 AUDIT_ARG_FD(uap->fd); 3060 AUDIT_ARG_OWNER(uap->uid, uap->gid); 3061 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 3062 if (error != 0) 3063 return (error); 3064 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 3065 fdrop(fp, td); 3066 return (error); 3067 } 3068 3069 /* 3070 * Common implementation code for utimes(), lutimes(), and futimes(). 3071 */ 3072 static int 3073 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 3074 struct timespec *tsp) 3075 { 3076 struct timeval tv[2]; 3077 const struct timeval *tvp; 3078 int error; 3079 3080 if (usrtvp == NULL) { 3081 vfs_timestamp(&tsp[0]); 3082 tsp[1] = tsp[0]; 3083 } else { 3084 if (tvpseg == UIO_SYSSPACE) { 3085 tvp = usrtvp; 3086 } else { 3087 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3088 return (error); 3089 tvp = tv; 3090 } 3091 3092 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3093 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3094 return (EINVAL); 3095 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3096 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3097 } 3098 return (0); 3099 } 3100 3101 /* 3102 * Common implementation code for futimens(), utimensat(). 3103 */ 3104 #define UTIMENS_NULL 0x1 3105 #define UTIMENS_EXIT 0x2 3106 static int 3107 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3108 struct timespec *tsp, int *retflags) 3109 { 3110 struct timespec tsnow; 3111 int error; 3112 3113 vfs_timestamp(&tsnow); 3114 *retflags = 0; 3115 if (usrtsp == NULL) { 3116 tsp[0] = tsnow; 3117 tsp[1] = tsnow; 3118 *retflags |= UTIMENS_NULL; 3119 return (0); 3120 } 3121 if (tspseg == UIO_SYSSPACE) { 3122 tsp[0] = usrtsp[0]; 3123 tsp[1] = usrtsp[1]; 3124 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3125 return (error); 3126 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3127 *retflags |= UTIMENS_EXIT; 3128 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3129 *retflags |= UTIMENS_NULL; 3130 if (tsp[0].tv_nsec == UTIME_OMIT) 3131 tsp[0].tv_sec = VNOVAL; 3132 else if (tsp[0].tv_nsec == UTIME_NOW) 3133 tsp[0] = tsnow; 3134 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3135 return (EINVAL); 3136 if (tsp[1].tv_nsec == UTIME_OMIT) 3137 tsp[1].tv_sec = VNOVAL; 3138 else if (tsp[1].tv_nsec == UTIME_NOW) 3139 tsp[1] = tsnow; 3140 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3141 return (EINVAL); 3142 3143 return (0); 3144 } 3145 3146 /* 3147 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3148 * and utimensat(). 3149 */ 3150 static int 3151 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3152 int numtimes, int nullflag) 3153 { 3154 struct mount *mp; 3155 struct vattr vattr; 3156 int error, setbirthtime; 3157 3158 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3159 return (error); 3160 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3161 setbirthtime = 0; 3162 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3163 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3164 setbirthtime = 1; 3165 VATTR_NULL(&vattr); 3166 vattr.va_atime = ts[0]; 3167 vattr.va_mtime = ts[1]; 3168 if (setbirthtime) 3169 vattr.va_birthtime = ts[1]; 3170 if (numtimes > 2) 3171 vattr.va_birthtime = ts[2]; 3172 if (nullflag) 3173 vattr.va_vaflags |= VA_UTIMES_NULL; 3174 #ifdef MAC 3175 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3176 vattr.va_mtime); 3177 #endif 3178 if (error == 0) 3179 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3180 VOP_UNLOCK(vp); 3181 vn_finished_write(mp); 3182 return (error); 3183 } 3184 3185 /* 3186 * Set the access and modification times of a file. 3187 */ 3188 #ifndef _SYS_SYSPROTO_H_ 3189 struct utimes_args { 3190 char *path; 3191 struct timeval *tptr; 3192 }; 3193 #endif 3194 int 3195 sys_utimes(struct thread *td, struct utimes_args *uap) 3196 { 3197 3198 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3199 uap->tptr, UIO_USERSPACE)); 3200 } 3201 3202 #ifndef _SYS_SYSPROTO_H_ 3203 struct futimesat_args { 3204 int fd; 3205 const char * path; 3206 const struct timeval * times; 3207 }; 3208 #endif 3209 int 3210 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3211 { 3212 3213 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3214 uap->times, UIO_USERSPACE)); 3215 } 3216 3217 int 3218 kern_utimesat(struct thread *td, int fd, const char *path, 3219 enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) 3220 { 3221 struct nameidata nd; 3222 struct timespec ts[2]; 3223 int error; 3224 3225 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3226 return (error); 3227 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3228 &cap_futimes_rights, td); 3229 3230 if ((error = namei(&nd)) != 0) 3231 return (error); 3232 NDFREE_NOTHING(&nd); 3233 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3234 vrele(nd.ni_vp); 3235 return (error); 3236 } 3237 3238 /* 3239 * Set the access and modification times of a file. 3240 */ 3241 #ifndef _SYS_SYSPROTO_H_ 3242 struct lutimes_args { 3243 char *path; 3244 struct timeval *tptr; 3245 }; 3246 #endif 3247 int 3248 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3249 { 3250 3251 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3252 UIO_USERSPACE)); 3253 } 3254 3255 int 3256 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3257 struct timeval *tptr, enum uio_seg tptrseg) 3258 { 3259 struct timespec ts[2]; 3260 struct nameidata nd; 3261 int error; 3262 3263 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3264 return (error); 3265 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3266 if ((error = namei(&nd)) != 0) 3267 return (error); 3268 NDFREE_NOTHING(&nd); 3269 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3270 vrele(nd.ni_vp); 3271 return (error); 3272 } 3273 3274 /* 3275 * Set the access and modification times of a file. 3276 */ 3277 #ifndef _SYS_SYSPROTO_H_ 3278 struct futimes_args { 3279 int fd; 3280 struct timeval *tptr; 3281 }; 3282 #endif 3283 int 3284 sys_futimes(struct thread *td, struct futimes_args *uap) 3285 { 3286 3287 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3288 } 3289 3290 int 3291 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3292 enum uio_seg tptrseg) 3293 { 3294 struct timespec ts[2]; 3295 struct file *fp; 3296 int error; 3297 3298 AUDIT_ARG_FD(fd); 3299 error = getutimes(tptr, tptrseg, ts); 3300 if (error != 0) 3301 return (error); 3302 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3303 if (error != 0) 3304 return (error); 3305 #ifdef AUDIT 3306 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3307 AUDIT_ARG_VNODE1(fp->f_vnode); 3308 VOP_UNLOCK(fp->f_vnode); 3309 #endif 3310 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3311 fdrop(fp, td); 3312 return (error); 3313 } 3314 3315 int 3316 sys_futimens(struct thread *td, struct futimens_args *uap) 3317 { 3318 3319 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3320 } 3321 3322 int 3323 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3324 enum uio_seg tptrseg) 3325 { 3326 struct timespec ts[2]; 3327 struct file *fp; 3328 int error, flags; 3329 3330 AUDIT_ARG_FD(fd); 3331 error = getutimens(tptr, tptrseg, ts, &flags); 3332 if (error != 0) 3333 return (error); 3334 if (flags & UTIMENS_EXIT) 3335 return (0); 3336 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3337 if (error != 0) 3338 return (error); 3339 #ifdef AUDIT 3340 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3341 AUDIT_ARG_VNODE1(fp->f_vnode); 3342 VOP_UNLOCK(fp->f_vnode); 3343 #endif 3344 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3345 fdrop(fp, td); 3346 return (error); 3347 } 3348 3349 int 3350 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3351 { 3352 3353 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3354 uap->times, UIO_USERSPACE, uap->flag)); 3355 } 3356 3357 int 3358 kern_utimensat(struct thread *td, int fd, const char *path, 3359 enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg, 3360 int flag) 3361 { 3362 struct nameidata nd; 3363 struct timespec ts[2]; 3364 int error, flags; 3365 3366 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3367 AT_EMPTY_PATH)) != 0) 3368 return (EINVAL); 3369 3370 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3371 return (error); 3372 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3373 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, 3374 pathseg, path, fd, &cap_futimes_rights, td); 3375 if ((error = namei(&nd)) != 0) 3376 return (error); 3377 /* 3378 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3379 * POSIX states: 3380 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3381 * "Search permission is denied by a component of the path prefix." 3382 */ 3383 NDFREE_NOTHING(&nd); 3384 if ((flags & UTIMENS_EXIT) == 0) 3385 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3386 vrele(nd.ni_vp); 3387 return (error); 3388 } 3389 3390 /* 3391 * Truncate a file given its path name. 3392 */ 3393 #ifndef _SYS_SYSPROTO_H_ 3394 struct truncate_args { 3395 char *path; 3396 int pad; 3397 off_t length; 3398 }; 3399 #endif 3400 int 3401 sys_truncate(struct thread *td, struct truncate_args *uap) 3402 { 3403 3404 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3405 } 3406 3407 int 3408 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3409 off_t length) 3410 { 3411 struct mount *mp; 3412 struct vnode *vp; 3413 void *rl_cookie; 3414 struct vattr vattr; 3415 struct nameidata nd; 3416 int error; 3417 3418 if (length < 0) 3419 return (EINVAL); 3420 retry: 3421 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3422 if ((error = namei(&nd)) != 0) 3423 return (error); 3424 vp = nd.ni_vp; 3425 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3426 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3427 vn_rangelock_unlock(vp, rl_cookie); 3428 vrele(vp); 3429 return (error); 3430 } 3431 NDFREE(&nd, NDF_ONLY_PNBUF); 3432 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3433 if (vp->v_type == VDIR) 3434 error = EISDIR; 3435 #ifdef MAC 3436 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3437 } 3438 #endif 3439 else if ((error = vn_writechk(vp)) == 0 && 3440 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3441 VATTR_NULL(&vattr); 3442 vattr.va_size = length; 3443 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3444 } 3445 VOP_UNLOCK(vp); 3446 vn_finished_write(mp); 3447 vn_rangelock_unlock(vp, rl_cookie); 3448 vrele(vp); 3449 if (error == ERELOOKUP) 3450 goto retry; 3451 return (error); 3452 } 3453 3454 #if defined(COMPAT_43) 3455 /* 3456 * Truncate a file given its path name. 3457 */ 3458 #ifndef _SYS_SYSPROTO_H_ 3459 struct otruncate_args { 3460 char *path; 3461 long length; 3462 }; 3463 #endif 3464 int 3465 otruncate(struct thread *td, struct otruncate_args *uap) 3466 { 3467 3468 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3469 } 3470 #endif /* COMPAT_43 */ 3471 3472 #if defined(COMPAT_FREEBSD6) 3473 /* Versions with the pad argument */ 3474 int 3475 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3476 { 3477 3478 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3479 } 3480 3481 int 3482 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3483 { 3484 3485 return (kern_ftruncate(td, uap->fd, uap->length)); 3486 } 3487 #endif 3488 3489 int 3490 kern_fsync(struct thread *td, int fd, bool fullsync) 3491 { 3492 struct vnode *vp; 3493 struct mount *mp; 3494 struct file *fp; 3495 int error, lock_flags; 3496 3497 AUDIT_ARG_FD(fd); 3498 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3499 if (error != 0) 3500 return (error); 3501 vp = fp->f_vnode; 3502 #if 0 3503 if (!fullsync) 3504 /* XXXKIB: compete outstanding aio writes */; 3505 #endif 3506 retry: 3507 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3508 if (error != 0) 3509 goto drop; 3510 if (MNT_SHARED_WRITES(mp) || 3511 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3512 lock_flags = LK_SHARED; 3513 } else { 3514 lock_flags = LK_EXCLUSIVE; 3515 } 3516 vn_lock(vp, lock_flags | LK_RETRY); 3517 AUDIT_ARG_VNODE1(vp); 3518 if (vp->v_object != NULL) { 3519 VM_OBJECT_WLOCK(vp->v_object); 3520 vm_object_page_clean(vp->v_object, 0, 0, 0); 3521 VM_OBJECT_WUNLOCK(vp->v_object); 3522 } 3523 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3524 VOP_UNLOCK(vp); 3525 vn_finished_write(mp); 3526 if (error == ERELOOKUP) 3527 goto retry; 3528 drop: 3529 fdrop(fp, td); 3530 return (error); 3531 } 3532 3533 /* 3534 * Sync an open file. 3535 */ 3536 #ifndef _SYS_SYSPROTO_H_ 3537 struct fsync_args { 3538 int fd; 3539 }; 3540 #endif 3541 int 3542 sys_fsync(struct thread *td, struct fsync_args *uap) 3543 { 3544 3545 return (kern_fsync(td, uap->fd, true)); 3546 } 3547 3548 int 3549 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3550 { 3551 3552 return (kern_fsync(td, uap->fd, false)); 3553 } 3554 3555 /* 3556 * Rename files. Source and destination must either both be directories, or 3557 * both not be directories. If target is a directory, it must be empty. 3558 */ 3559 #ifndef _SYS_SYSPROTO_H_ 3560 struct rename_args { 3561 char *from; 3562 char *to; 3563 }; 3564 #endif 3565 int 3566 sys_rename(struct thread *td, struct rename_args *uap) 3567 { 3568 3569 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3570 uap->to, UIO_USERSPACE)); 3571 } 3572 3573 #ifndef _SYS_SYSPROTO_H_ 3574 struct renameat_args { 3575 int oldfd; 3576 char *old; 3577 int newfd; 3578 char *new; 3579 }; 3580 #endif 3581 int 3582 sys_renameat(struct thread *td, struct renameat_args *uap) 3583 { 3584 3585 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3586 UIO_USERSPACE)); 3587 } 3588 3589 #ifdef MAC 3590 static int 3591 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd, 3592 const char *new, enum uio_seg pathseg, struct nameidata *fromnd) 3593 { 3594 int error; 3595 3596 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3597 AUDITVNODE1, pathseg, old, oldfd, &cap_renameat_source_rights, td); 3598 if ((error = namei(fromnd)) != 0) 3599 return (error); 3600 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp, 3601 fromnd->ni_vp, &fromnd->ni_cnd); 3602 VOP_UNLOCK(fromnd->ni_dvp); 3603 if (fromnd->ni_dvp != fromnd->ni_vp) 3604 VOP_UNLOCK(fromnd->ni_vp); 3605 if (error != 0) { 3606 NDFREE(fromnd, NDF_ONLY_PNBUF); 3607 vrele(fromnd->ni_dvp); 3608 vrele(fromnd->ni_vp); 3609 if (fromnd->ni_startdir) 3610 vrele(fromnd->ni_startdir); 3611 } 3612 return (error); 3613 } 3614 #endif 3615 3616 int 3617 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3618 const char *new, enum uio_seg pathseg) 3619 { 3620 struct mount *mp = NULL; 3621 struct vnode *tvp, *fvp, *tdvp; 3622 struct nameidata fromnd, tond; 3623 u_int64_t tondflags; 3624 int error; 3625 3626 again: 3627 bwillwrite(); 3628 #ifdef MAC 3629 if (mac_vnode_check_rename_from_enabled()) { 3630 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg, 3631 &fromnd); 3632 if (error != 0) 3633 return (error); 3634 } else { 3635 #endif 3636 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3637 pathseg, old, oldfd, &cap_renameat_source_rights, td); 3638 if ((error = namei(&fromnd)) != 0) 3639 return (error); 3640 #ifdef MAC 3641 } 3642 #endif 3643 fvp = fromnd.ni_vp; 3644 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | AUDITVNODE2; 3645 if (fromnd.ni_vp->v_type == VDIR) 3646 tondflags |= WILLBEDIR; 3647 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd, 3648 &cap_renameat_target_rights, td); 3649 if ((error = namei(&tond)) != 0) { 3650 /* Translate error code for rename("dir1", "dir2/."). */ 3651 if (error == EISDIR && fvp->v_type == VDIR) 3652 error = EINVAL; 3653 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3654 vrele(fromnd.ni_dvp); 3655 vrele(fvp); 3656 goto out1; 3657 } 3658 tdvp = tond.ni_dvp; 3659 tvp = tond.ni_vp; 3660 error = vn_start_write(fvp, &mp, V_NOWAIT); 3661 if (error != 0) { 3662 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3663 NDFREE(&tond, NDF_ONLY_PNBUF); 3664 if (tvp != NULL) 3665 vput(tvp); 3666 if (tdvp == tvp) 3667 vrele(tdvp); 3668 else 3669 vput(tdvp); 3670 vrele(fromnd.ni_dvp); 3671 vrele(fvp); 3672 vrele(tond.ni_startdir); 3673 if (fromnd.ni_startdir != NULL) 3674 vrele(fromnd.ni_startdir); 3675 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3676 if (error != 0) 3677 return (error); 3678 goto again; 3679 } 3680 if (tvp != NULL) { 3681 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3682 error = ENOTDIR; 3683 goto out; 3684 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3685 error = EISDIR; 3686 goto out; 3687 } 3688 #ifdef CAPABILITIES 3689 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3690 /* 3691 * If the target already exists we require CAP_UNLINKAT 3692 * from 'newfd', when newfd was used for the lookup. 3693 */ 3694 error = cap_check(&tond.ni_filecaps.fc_rights, 3695 &cap_unlinkat_rights); 3696 if (error != 0) 3697 goto out; 3698 } 3699 #endif 3700 } 3701 if (fvp == tdvp) { 3702 error = EINVAL; 3703 goto out; 3704 } 3705 /* 3706 * If the source is the same as the destination (that is, if they 3707 * are links to the same vnode), then there is nothing to do. 3708 */ 3709 if (fvp == tvp) 3710 error = ERESTART; 3711 #ifdef MAC 3712 else 3713 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3714 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3715 #endif 3716 out: 3717 if (error == 0) { 3718 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3719 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3720 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3721 NDFREE(&tond, NDF_ONLY_PNBUF); 3722 } else { 3723 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3724 NDFREE(&tond, NDF_ONLY_PNBUF); 3725 if (tvp != NULL) 3726 vput(tvp); 3727 if (tdvp == tvp) 3728 vrele(tdvp); 3729 else 3730 vput(tdvp); 3731 vrele(fromnd.ni_dvp); 3732 vrele(fvp); 3733 } 3734 vrele(tond.ni_startdir); 3735 vn_finished_write(mp); 3736 out1: 3737 if (fromnd.ni_startdir) 3738 vrele(fromnd.ni_startdir); 3739 if (error == ERESTART) 3740 return (0); 3741 if (error == ERELOOKUP) 3742 goto again; 3743 return (error); 3744 } 3745 3746 /* 3747 * Make a directory file. 3748 */ 3749 #ifndef _SYS_SYSPROTO_H_ 3750 struct mkdir_args { 3751 char *path; 3752 int mode; 3753 }; 3754 #endif 3755 int 3756 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3757 { 3758 3759 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3760 uap->mode)); 3761 } 3762 3763 #ifndef _SYS_SYSPROTO_H_ 3764 struct mkdirat_args { 3765 int fd; 3766 char *path; 3767 mode_t mode; 3768 }; 3769 #endif 3770 int 3771 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3772 { 3773 3774 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3775 } 3776 3777 int 3778 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3779 int mode) 3780 { 3781 struct mount *mp; 3782 struct vattr vattr; 3783 struct nameidata nd; 3784 int error; 3785 3786 AUDIT_ARG_MODE(mode); 3787 restart: 3788 bwillwrite(); 3789 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3790 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR, 3791 segflg, path, fd, &cap_mkdirat_rights, td); 3792 if ((error = namei(&nd)) != 0) 3793 return (error); 3794 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3795 NDFREE(&nd, NDF_ONLY_PNBUF); 3796 vput(nd.ni_dvp); 3797 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3798 return (error); 3799 goto restart; 3800 } 3801 VATTR_NULL(&vattr); 3802 vattr.va_type = VDIR; 3803 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask; 3804 #ifdef MAC 3805 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3806 &vattr); 3807 if (error != 0) 3808 goto out; 3809 #endif 3810 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3811 #ifdef MAC 3812 out: 3813 #endif 3814 NDFREE(&nd, NDF_ONLY_PNBUF); 3815 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 3816 vn_finished_write(mp); 3817 if (error == ERELOOKUP) 3818 goto restart; 3819 return (error); 3820 } 3821 3822 /* 3823 * Remove a directory file. 3824 */ 3825 #ifndef _SYS_SYSPROTO_H_ 3826 struct rmdir_args { 3827 char *path; 3828 }; 3829 #endif 3830 int 3831 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3832 { 3833 3834 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3835 0)); 3836 } 3837 3838 int 3839 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3840 enum uio_seg pathseg, int flag) 3841 { 3842 struct mount *mp; 3843 struct vnode *vp; 3844 struct file *fp; 3845 struct nameidata nd; 3846 cap_rights_t rights; 3847 int error; 3848 3849 fp = NULL; 3850 if (fd != FD_NONE) { 3851 error = getvnode(td, fd, cap_rights_init_one(&rights, 3852 CAP_LOOKUP), &fp); 3853 if (error != 0) 3854 return (error); 3855 } 3856 3857 restart: 3858 bwillwrite(); 3859 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3860 at2cnpflags(flag, AT_RESOLVE_BENEATH), 3861 pathseg, path, dfd, &cap_unlinkat_rights, td); 3862 if ((error = namei(&nd)) != 0) 3863 goto fdout; 3864 vp = nd.ni_vp; 3865 if (vp->v_type != VDIR) { 3866 error = ENOTDIR; 3867 goto out; 3868 } 3869 /* 3870 * No rmdir "." please. 3871 */ 3872 if (nd.ni_dvp == vp) { 3873 error = EINVAL; 3874 goto out; 3875 } 3876 /* 3877 * The root of a mounted filesystem cannot be deleted. 3878 */ 3879 if (vp->v_vflag & VV_ROOT) { 3880 error = EBUSY; 3881 goto out; 3882 } 3883 3884 if (fp != NULL && fp->f_vnode != vp) { 3885 if (VN_IS_DOOMED(fp->f_vnode)) 3886 error = EBADF; 3887 else 3888 error = EDEADLK; 3889 goto out; 3890 } 3891 3892 #ifdef MAC 3893 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3894 &nd.ni_cnd); 3895 if (error != 0) 3896 goto out; 3897 #endif 3898 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3899 NDFREE(&nd, NDF_ONLY_PNBUF); 3900 vput(vp); 3901 if (nd.ni_dvp == vp) 3902 vrele(nd.ni_dvp); 3903 else 3904 vput(nd.ni_dvp); 3905 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3906 goto fdout; 3907 goto restart; 3908 } 3909 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3910 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3911 vn_finished_write(mp); 3912 out: 3913 NDFREE(&nd, NDF_ONLY_PNBUF); 3914 vput(vp); 3915 if (nd.ni_dvp == vp) 3916 vrele(nd.ni_dvp); 3917 else 3918 vput(nd.ni_dvp); 3919 if (error == ERELOOKUP) 3920 goto restart; 3921 fdout: 3922 if (fp != NULL) 3923 fdrop(fp, td); 3924 return (error); 3925 } 3926 3927 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3928 int 3929 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3930 long *basep, void (*func)(struct freebsd11_dirent *)) 3931 { 3932 struct freebsd11_dirent dstdp; 3933 struct dirent *dp, *edp; 3934 char *dirbuf; 3935 off_t base; 3936 ssize_t resid, ucount; 3937 int error; 3938 3939 /* XXX arbitrary sanity limit on `count'. */ 3940 count = min(count, 64 * 1024); 3941 3942 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3943 3944 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3945 UIO_SYSSPACE); 3946 if (error != 0) 3947 goto done; 3948 if (basep != NULL) 3949 *basep = base; 3950 3951 ucount = 0; 3952 for (dp = (struct dirent *)dirbuf, 3953 edp = (struct dirent *)&dirbuf[count - resid]; 3954 ucount < count && dp < edp; ) { 3955 if (dp->d_reclen == 0) 3956 break; 3957 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3958 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3959 continue; 3960 dstdp.d_type = dp->d_type; 3961 dstdp.d_namlen = dp->d_namlen; 3962 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3963 if (dstdp.d_fileno != dp->d_fileno) { 3964 switch (ino64_trunc_error) { 3965 default: 3966 case 0: 3967 break; 3968 case 1: 3969 error = EOVERFLOW; 3970 goto done; 3971 case 2: 3972 dstdp.d_fileno = UINT32_MAX; 3973 break; 3974 } 3975 } 3976 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3977 ((dp->d_namlen + 1 + 3) &~ 3); 3978 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3979 bzero(dstdp.d_name + dstdp.d_namlen, 3980 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3981 dstdp.d_namlen); 3982 MPASS(dstdp.d_reclen <= dp->d_reclen); 3983 MPASS(ucount + dstdp.d_reclen <= count); 3984 if (func != NULL) 3985 func(&dstdp); 3986 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3987 if (error != 0) 3988 break; 3989 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3990 ucount += dstdp.d_reclen; 3991 } 3992 3993 done: 3994 free(dirbuf, M_TEMP); 3995 if (error == 0) 3996 td->td_retval[0] = ucount; 3997 return (error); 3998 } 3999 #endif /* COMPAT */ 4000 4001 #ifdef COMPAT_43 4002 static void 4003 ogetdirentries_cvt(struct freebsd11_dirent *dp) 4004 { 4005 #if (BYTE_ORDER == LITTLE_ENDIAN) 4006 /* 4007 * The expected low byte of dp->d_namlen is our dp->d_type. 4008 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 4009 */ 4010 dp->d_type = dp->d_namlen; 4011 dp->d_namlen = 0; 4012 #else 4013 /* 4014 * The dp->d_type is the high byte of the expected dp->d_namlen, 4015 * so must be zero'ed. 4016 */ 4017 dp->d_type = 0; 4018 #endif 4019 } 4020 4021 /* 4022 * Read a block of directory entries in a filesystem independent format. 4023 */ 4024 #ifndef _SYS_SYSPROTO_H_ 4025 struct ogetdirentries_args { 4026 int fd; 4027 char *buf; 4028 u_int count; 4029 long *basep; 4030 }; 4031 #endif 4032 int 4033 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 4034 { 4035 long loff; 4036 int error; 4037 4038 error = kern_ogetdirentries(td, uap, &loff); 4039 if (error == 0) 4040 error = copyout(&loff, uap->basep, sizeof(long)); 4041 return (error); 4042 } 4043 4044 int 4045 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 4046 long *ploff) 4047 { 4048 long base; 4049 int error; 4050 4051 /* XXX arbitrary sanity limit on `count'. */ 4052 if (uap->count > 64 * 1024) 4053 return (EINVAL); 4054 4055 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4056 &base, ogetdirentries_cvt); 4057 4058 if (error == 0 && uap->basep != NULL) 4059 error = copyout(&base, uap->basep, sizeof(long)); 4060 4061 return (error); 4062 } 4063 #endif /* COMPAT_43 */ 4064 4065 #if defined(COMPAT_FREEBSD11) 4066 #ifndef _SYS_SYSPROTO_H_ 4067 struct freebsd11_getdirentries_args { 4068 int fd; 4069 char *buf; 4070 u_int count; 4071 long *basep; 4072 }; 4073 #endif 4074 int 4075 freebsd11_getdirentries(struct thread *td, 4076 struct freebsd11_getdirentries_args *uap) 4077 { 4078 long base; 4079 int error; 4080 4081 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4082 &base, NULL); 4083 4084 if (error == 0 && uap->basep != NULL) 4085 error = copyout(&base, uap->basep, sizeof(long)); 4086 return (error); 4087 } 4088 4089 int 4090 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 4091 { 4092 struct freebsd11_getdirentries_args ap; 4093 4094 ap.fd = uap->fd; 4095 ap.buf = uap->buf; 4096 ap.count = uap->count; 4097 ap.basep = NULL; 4098 return (freebsd11_getdirentries(td, &ap)); 4099 } 4100 #endif /* COMPAT_FREEBSD11 */ 4101 4102 /* 4103 * Read a block of directory entries in a filesystem independent format. 4104 */ 4105 int 4106 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4107 { 4108 off_t base; 4109 int error; 4110 4111 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4112 NULL, UIO_USERSPACE); 4113 if (error != 0) 4114 return (error); 4115 if (uap->basep != NULL) 4116 error = copyout(&base, uap->basep, sizeof(off_t)); 4117 return (error); 4118 } 4119 4120 int 4121 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4122 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4123 { 4124 struct vnode *vp; 4125 struct file *fp; 4126 struct uio auio; 4127 struct iovec aiov; 4128 off_t loff; 4129 int error, eofflag; 4130 off_t foffset; 4131 4132 AUDIT_ARG_FD(fd); 4133 if (count > IOSIZE_MAX) 4134 return (EINVAL); 4135 auio.uio_resid = count; 4136 error = getvnode(td, fd, &cap_read_rights, &fp); 4137 if (error != 0) 4138 return (error); 4139 if ((fp->f_flag & FREAD) == 0) { 4140 fdrop(fp, td); 4141 return (EBADF); 4142 } 4143 vp = fp->f_vnode; 4144 foffset = foffset_lock(fp, 0); 4145 unionread: 4146 if (vp->v_type != VDIR) { 4147 error = EINVAL; 4148 goto fail; 4149 } 4150 aiov.iov_base = buf; 4151 aiov.iov_len = count; 4152 auio.uio_iov = &aiov; 4153 auio.uio_iovcnt = 1; 4154 auio.uio_rw = UIO_READ; 4155 auio.uio_segflg = bufseg; 4156 auio.uio_td = td; 4157 vn_lock(vp, LK_SHARED | LK_RETRY); 4158 AUDIT_ARG_VNODE1(vp); 4159 loff = auio.uio_offset = foffset; 4160 #ifdef MAC 4161 error = mac_vnode_check_readdir(td->td_ucred, vp); 4162 if (error == 0) 4163 #endif 4164 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4165 NULL); 4166 foffset = auio.uio_offset; 4167 if (error != 0) { 4168 VOP_UNLOCK(vp); 4169 goto fail; 4170 } 4171 if (count == auio.uio_resid && 4172 (vp->v_vflag & VV_ROOT) && 4173 (vp->v_mount->mnt_flag & MNT_UNION)) { 4174 struct vnode *tvp = vp; 4175 4176 vp = vp->v_mount->mnt_vnodecovered; 4177 VREF(vp); 4178 fp->f_vnode = vp; 4179 foffset = 0; 4180 vput(tvp); 4181 goto unionread; 4182 } 4183 VOP_UNLOCK(vp); 4184 *basep = loff; 4185 if (residp != NULL) 4186 *residp = auio.uio_resid; 4187 td->td_retval[0] = count - auio.uio_resid; 4188 fail: 4189 foffset_unlock(fp, foffset, 0); 4190 fdrop(fp, td); 4191 return (error); 4192 } 4193 4194 /* 4195 * Set the mode mask for creation of filesystem nodes. 4196 */ 4197 #ifndef _SYS_SYSPROTO_H_ 4198 struct umask_args { 4199 int newmask; 4200 }; 4201 #endif 4202 int 4203 sys_umask(struct thread *td, struct umask_args *uap) 4204 { 4205 struct pwddesc *pdp; 4206 4207 pdp = td->td_proc->p_pd; 4208 PWDDESC_XLOCK(pdp); 4209 td->td_retval[0] = pdp->pd_cmask; 4210 pdp->pd_cmask = uap->newmask & ALLPERMS; 4211 PWDDESC_XUNLOCK(pdp); 4212 return (0); 4213 } 4214 4215 /* 4216 * Void all references to file by ripping underlying filesystem away from 4217 * vnode. 4218 */ 4219 #ifndef _SYS_SYSPROTO_H_ 4220 struct revoke_args { 4221 char *path; 4222 }; 4223 #endif 4224 int 4225 sys_revoke(struct thread *td, struct revoke_args *uap) 4226 { 4227 struct vnode *vp; 4228 struct vattr vattr; 4229 struct nameidata nd; 4230 int error; 4231 4232 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4233 uap->path, td); 4234 if ((error = namei(&nd)) != 0) 4235 return (error); 4236 vp = nd.ni_vp; 4237 NDFREE_NOTHING(&nd); 4238 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4239 error = EINVAL; 4240 goto out; 4241 } 4242 #ifdef MAC 4243 error = mac_vnode_check_revoke(td->td_ucred, vp); 4244 if (error != 0) 4245 goto out; 4246 #endif 4247 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4248 if (error != 0) 4249 goto out; 4250 if (td->td_ucred->cr_uid != vattr.va_uid) { 4251 error = priv_check(td, PRIV_VFS_ADMIN); 4252 if (error != 0) 4253 goto out; 4254 } 4255 if (devfs_usecount(vp) > 0) 4256 VOP_REVOKE(vp, REVOKEALL); 4257 out: 4258 vput(vp); 4259 return (error); 4260 } 4261 4262 /* 4263 * This variant of getvnode() allows O_PATH files. Caller should 4264 * ensure that returned file and vnode are only used for compatible 4265 * semantics. 4266 */ 4267 int 4268 getvnode_path(struct thread *td, int fd, cap_rights_t *rightsp, 4269 struct file **fpp) 4270 { 4271 struct file *fp; 4272 int error; 4273 4274 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp); 4275 if (error != 0) 4276 return (error); 4277 4278 /* 4279 * The file could be not of the vnode type, or it may be not 4280 * yet fully initialized, in which case the f_vnode pointer 4281 * may be set, but f_ops is still badfileops. E.g., 4282 * devfs_open() transiently create such situation to 4283 * facilitate csw d_fdopen(). 4284 * 4285 * Dupfdopen() handling in kern_openat() installs the 4286 * half-baked file into the process descriptor table, allowing 4287 * other thread to dereference it. Guard against the race by 4288 * checking f_ops. 4289 */ 4290 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4291 fdrop(fp, td); 4292 return (EINVAL); 4293 } 4294 4295 *fpp = fp; 4296 return (0); 4297 } 4298 4299 /* 4300 * Convert a user file descriptor to a kernel file entry and check 4301 * that, if it is a capability, the correct rights are present. 4302 * A reference on the file entry is held upon returning. 4303 */ 4304 int 4305 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4306 { 4307 int error; 4308 4309 error = getvnode_path(td, fd, rightsp, fpp); 4310 4311 /* 4312 * Filter out O_PATH file descriptors, most getvnode() callers 4313 * do not call fo_ methods. 4314 */ 4315 if (error == 0 && (*fpp)->f_ops == &path_fileops) { 4316 fdrop(*fpp, td); 4317 error = EBADF; 4318 } 4319 4320 return (error); 4321 } 4322 4323 /* 4324 * Get an (NFS) file handle. 4325 */ 4326 #ifndef _SYS_SYSPROTO_H_ 4327 struct lgetfh_args { 4328 char *fname; 4329 fhandle_t *fhp; 4330 }; 4331 #endif 4332 int 4333 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4334 { 4335 4336 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4337 UIO_USERSPACE, uap->fhp, UIO_USERSPACE)); 4338 } 4339 4340 #ifndef _SYS_SYSPROTO_H_ 4341 struct getfh_args { 4342 char *fname; 4343 fhandle_t *fhp; 4344 }; 4345 #endif 4346 int 4347 sys_getfh(struct thread *td, struct getfh_args *uap) 4348 { 4349 4350 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4351 uap->fhp, UIO_USERSPACE)); 4352 } 4353 4354 /* 4355 * syscall for the rpc.lockd to use to translate an open descriptor into 4356 * a NFS file handle. 4357 * 4358 * warning: do not remove the priv_check() call or this becomes one giant 4359 * security hole. 4360 */ 4361 #ifndef _SYS_SYSPROTO_H_ 4362 struct getfhat_args { 4363 int fd; 4364 char *path; 4365 fhandle_t *fhp; 4366 int flags; 4367 }; 4368 #endif 4369 int 4370 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4371 { 4372 4373 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4374 return (EINVAL); 4375 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4376 uap->fhp, UIO_USERSPACE)); 4377 } 4378 4379 int 4380 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4381 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg) 4382 { 4383 struct nameidata nd; 4384 fhandle_t fh; 4385 struct vnode *vp; 4386 int error; 4387 4388 error = priv_check(td, PRIV_VFS_GETFH); 4389 if (error != 0) 4390 return (error); 4391 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4392 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4393 fd, td); 4394 error = namei(&nd); 4395 if (error != 0) 4396 return (error); 4397 NDFREE_NOTHING(&nd); 4398 vp = nd.ni_vp; 4399 bzero(&fh, sizeof(fh)); 4400 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4401 error = VOP_VPTOFH(vp, &fh.fh_fid); 4402 vput(vp); 4403 if (error == 0) { 4404 if (fhseg == UIO_USERSPACE) 4405 error = copyout(&fh, fhp, sizeof (fh)); 4406 else 4407 memcpy(fhp, &fh, sizeof(fh)); 4408 } 4409 return (error); 4410 } 4411 4412 #ifndef _SYS_SYSPROTO_H_ 4413 struct fhlink_args { 4414 fhandle_t *fhp; 4415 const char *to; 4416 }; 4417 #endif 4418 int 4419 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4420 { 4421 4422 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4423 } 4424 4425 #ifndef _SYS_SYSPROTO_H_ 4426 struct fhlinkat_args { 4427 fhandle_t *fhp; 4428 int tofd; 4429 const char *to; 4430 }; 4431 #endif 4432 int 4433 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4434 { 4435 4436 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4437 } 4438 4439 static int 4440 kern_fhlinkat(struct thread *td, int fd, const char *path, 4441 enum uio_seg pathseg, fhandle_t *fhp) 4442 { 4443 fhandle_t fh; 4444 struct mount *mp; 4445 struct vnode *vp; 4446 int error; 4447 4448 error = priv_check(td, PRIV_VFS_GETFH); 4449 if (error != 0) 4450 return (error); 4451 error = copyin(fhp, &fh, sizeof(fh)); 4452 if (error != 0) 4453 return (error); 4454 do { 4455 bwillwrite(); 4456 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4457 return (ESTALE); 4458 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4459 vfs_unbusy(mp); 4460 if (error != 0) 4461 return (error); 4462 VOP_UNLOCK(vp); 4463 error = kern_linkat_vp(td, vp, fd, path, pathseg); 4464 } while (error == EAGAIN || error == ERELOOKUP); 4465 return (error); 4466 } 4467 4468 #ifndef _SYS_SYSPROTO_H_ 4469 struct fhreadlink_args { 4470 fhandle_t *fhp; 4471 char *buf; 4472 size_t bufsize; 4473 }; 4474 #endif 4475 int 4476 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4477 { 4478 fhandle_t fh; 4479 struct mount *mp; 4480 struct vnode *vp; 4481 int error; 4482 4483 error = priv_check(td, PRIV_VFS_GETFH); 4484 if (error != 0) 4485 return (error); 4486 if (uap->bufsize > IOSIZE_MAX) 4487 return (EINVAL); 4488 error = copyin(uap->fhp, &fh, sizeof(fh)); 4489 if (error != 0) 4490 return (error); 4491 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4492 return (ESTALE); 4493 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4494 vfs_unbusy(mp); 4495 if (error != 0) 4496 return (error); 4497 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4498 vput(vp); 4499 return (error); 4500 } 4501 4502 /* 4503 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4504 * open descriptor. 4505 * 4506 * warning: do not remove the priv_check() call or this becomes one giant 4507 * security hole. 4508 */ 4509 #ifndef _SYS_SYSPROTO_H_ 4510 struct fhopen_args { 4511 const struct fhandle *u_fhp; 4512 int flags; 4513 }; 4514 #endif 4515 int 4516 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4517 { 4518 return (kern_fhopen(td, uap->u_fhp, uap->flags)); 4519 } 4520 4521 int 4522 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags) 4523 { 4524 struct mount *mp; 4525 struct vnode *vp; 4526 struct fhandle fhp; 4527 struct file *fp; 4528 int fmode, error; 4529 int indx; 4530 4531 error = priv_check(td, PRIV_VFS_FHOPEN); 4532 if (error != 0) 4533 return (error); 4534 indx = -1; 4535 fmode = FFLAGS(flags); 4536 /* why not allow a non-read/write open for our lockd? */ 4537 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4538 return (EINVAL); 4539 error = copyin(u_fhp, &fhp, sizeof(fhp)); 4540 if (error != 0) 4541 return(error); 4542 /* find the mount point */ 4543 mp = vfs_busyfs(&fhp.fh_fsid); 4544 if (mp == NULL) 4545 return (ESTALE); 4546 /* now give me my vnode, it gets returned to me locked */ 4547 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4548 vfs_unbusy(mp); 4549 if (error != 0) 4550 return (error); 4551 4552 error = falloc_noinstall(td, &fp); 4553 if (error != 0) { 4554 vput(vp); 4555 return (error); 4556 } 4557 /* 4558 * An extra reference on `fp' has been held for us by 4559 * falloc_noinstall(). 4560 */ 4561 4562 #ifdef INVARIANTS 4563 td->td_dupfd = -1; 4564 #endif 4565 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4566 if (error != 0) { 4567 KASSERT(fp->f_ops == &badfileops, 4568 ("VOP_OPEN in fhopen() set f_ops")); 4569 KASSERT(td->td_dupfd < 0, 4570 ("fhopen() encountered fdopen()")); 4571 4572 vput(vp); 4573 goto bad; 4574 } 4575 #ifdef INVARIANTS 4576 td->td_dupfd = 0; 4577 #endif 4578 fp->f_vnode = vp; 4579 finit_vnode(fp, fmode, NULL, &vnops); 4580 VOP_UNLOCK(vp); 4581 if ((fmode & O_TRUNC) != 0) { 4582 error = fo_truncate(fp, 0, td->td_ucred, td); 4583 if (error != 0) 4584 goto bad; 4585 } 4586 4587 error = finstall(td, fp, &indx, fmode, NULL); 4588 bad: 4589 fdrop(fp, td); 4590 td->td_retval[0] = indx; 4591 return (error); 4592 } 4593 4594 /* 4595 * Stat an (NFS) file handle. 4596 */ 4597 #ifndef _SYS_SYSPROTO_H_ 4598 struct fhstat_args { 4599 struct fhandle *u_fhp; 4600 struct stat *sb; 4601 }; 4602 #endif 4603 int 4604 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4605 { 4606 struct stat sb; 4607 struct fhandle fh; 4608 int error; 4609 4610 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4611 if (error != 0) 4612 return (error); 4613 error = kern_fhstat(td, fh, &sb); 4614 if (error == 0) 4615 error = copyout(&sb, uap->sb, sizeof(sb)); 4616 return (error); 4617 } 4618 4619 int 4620 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4621 { 4622 struct mount *mp; 4623 struct vnode *vp; 4624 int error; 4625 4626 error = priv_check(td, PRIV_VFS_FHSTAT); 4627 if (error != 0) 4628 return (error); 4629 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4630 return (ESTALE); 4631 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4632 vfs_unbusy(mp); 4633 if (error != 0) 4634 return (error); 4635 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED, td); 4636 vput(vp); 4637 return (error); 4638 } 4639 4640 /* 4641 * Implement fstatfs() for (NFS) file handles. 4642 */ 4643 #ifndef _SYS_SYSPROTO_H_ 4644 struct fhstatfs_args { 4645 struct fhandle *u_fhp; 4646 struct statfs *buf; 4647 }; 4648 #endif 4649 int 4650 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4651 { 4652 struct statfs *sfp; 4653 fhandle_t fh; 4654 int error; 4655 4656 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4657 if (error != 0) 4658 return (error); 4659 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4660 error = kern_fhstatfs(td, fh, sfp); 4661 if (error == 0) 4662 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4663 free(sfp, M_STATFS); 4664 return (error); 4665 } 4666 4667 int 4668 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4669 { 4670 struct mount *mp; 4671 struct vnode *vp; 4672 int error; 4673 4674 error = priv_check(td, PRIV_VFS_FHSTATFS); 4675 if (error != 0) 4676 return (error); 4677 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4678 return (ESTALE); 4679 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4680 if (error != 0) { 4681 vfs_unbusy(mp); 4682 return (error); 4683 } 4684 vput(vp); 4685 error = prison_canseemount(td->td_ucred, mp); 4686 if (error != 0) 4687 goto out; 4688 #ifdef MAC 4689 error = mac_mount_check_stat(td->td_ucred, mp); 4690 if (error != 0) 4691 goto out; 4692 #endif 4693 error = VFS_STATFS(mp, buf); 4694 out: 4695 vfs_unbusy(mp); 4696 return (error); 4697 } 4698 4699 /* 4700 * Unlike madvise(2), we do not make a best effort to remember every 4701 * possible caching hint. Instead, we remember the last setting with 4702 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4703 * region of any current setting. 4704 */ 4705 int 4706 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4707 int advice) 4708 { 4709 struct fadvise_info *fa, *new; 4710 struct file *fp; 4711 struct vnode *vp; 4712 off_t end; 4713 int error; 4714 4715 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4716 return (EINVAL); 4717 AUDIT_ARG_VALUE(advice); 4718 switch (advice) { 4719 case POSIX_FADV_SEQUENTIAL: 4720 case POSIX_FADV_RANDOM: 4721 case POSIX_FADV_NOREUSE: 4722 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4723 break; 4724 case POSIX_FADV_NORMAL: 4725 case POSIX_FADV_WILLNEED: 4726 case POSIX_FADV_DONTNEED: 4727 new = NULL; 4728 break; 4729 default: 4730 return (EINVAL); 4731 } 4732 /* XXX: CAP_POSIX_FADVISE? */ 4733 AUDIT_ARG_FD(fd); 4734 error = fget(td, fd, &cap_no_rights, &fp); 4735 if (error != 0) 4736 goto out; 4737 AUDIT_ARG_FILE(td->td_proc, fp); 4738 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4739 error = ESPIPE; 4740 goto out; 4741 } 4742 if (fp->f_type != DTYPE_VNODE) { 4743 error = ENODEV; 4744 goto out; 4745 } 4746 vp = fp->f_vnode; 4747 if (vp->v_type != VREG) { 4748 error = ENODEV; 4749 goto out; 4750 } 4751 if (len == 0) 4752 end = OFF_MAX; 4753 else 4754 end = offset + len - 1; 4755 switch (advice) { 4756 case POSIX_FADV_SEQUENTIAL: 4757 case POSIX_FADV_RANDOM: 4758 case POSIX_FADV_NOREUSE: 4759 /* 4760 * Try to merge any existing non-standard region with 4761 * this new region if possible, otherwise create a new 4762 * non-standard region for this request. 4763 */ 4764 mtx_pool_lock(mtxpool_sleep, fp); 4765 fa = fp->f_advice; 4766 if (fa != NULL && fa->fa_advice == advice && 4767 ((fa->fa_start <= end && fa->fa_end >= offset) || 4768 (end != OFF_MAX && fa->fa_start == end + 1) || 4769 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4770 if (offset < fa->fa_start) 4771 fa->fa_start = offset; 4772 if (end > fa->fa_end) 4773 fa->fa_end = end; 4774 } else { 4775 new->fa_advice = advice; 4776 new->fa_start = offset; 4777 new->fa_end = end; 4778 fp->f_advice = new; 4779 new = fa; 4780 } 4781 mtx_pool_unlock(mtxpool_sleep, fp); 4782 break; 4783 case POSIX_FADV_NORMAL: 4784 /* 4785 * If a the "normal" region overlaps with an existing 4786 * non-standard region, trim or remove the 4787 * non-standard region. 4788 */ 4789 mtx_pool_lock(mtxpool_sleep, fp); 4790 fa = fp->f_advice; 4791 if (fa != NULL) { 4792 if (offset <= fa->fa_start && end >= fa->fa_end) { 4793 new = fa; 4794 fp->f_advice = NULL; 4795 } else if (offset <= fa->fa_start && 4796 end >= fa->fa_start) 4797 fa->fa_start = end + 1; 4798 else if (offset <= fa->fa_end && end >= fa->fa_end) 4799 fa->fa_end = offset - 1; 4800 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4801 /* 4802 * If the "normal" region is a middle 4803 * portion of the existing 4804 * non-standard region, just remove 4805 * the whole thing rather than picking 4806 * one side or the other to 4807 * preserve. 4808 */ 4809 new = fa; 4810 fp->f_advice = NULL; 4811 } 4812 } 4813 mtx_pool_unlock(mtxpool_sleep, fp); 4814 break; 4815 case POSIX_FADV_WILLNEED: 4816 case POSIX_FADV_DONTNEED: 4817 error = VOP_ADVISE(vp, offset, end, advice); 4818 break; 4819 } 4820 out: 4821 if (fp != NULL) 4822 fdrop(fp, td); 4823 free(new, M_FADVISE); 4824 return (error); 4825 } 4826 4827 int 4828 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4829 { 4830 int error; 4831 4832 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4833 uap->advice); 4834 return (kern_posix_error(td, error)); 4835 } 4836 4837 int 4838 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 4839 off_t *outoffp, size_t len, unsigned int flags) 4840 { 4841 struct file *infp, *outfp; 4842 struct vnode *invp, *outvp; 4843 int error; 4844 size_t retlen; 4845 void *rl_rcookie, *rl_wcookie; 4846 off_t savinoff, savoutoff; 4847 4848 infp = outfp = NULL; 4849 rl_rcookie = rl_wcookie = NULL; 4850 savinoff = -1; 4851 error = 0; 4852 retlen = 0; 4853 4854 if (flags != 0) { 4855 error = EINVAL; 4856 goto out; 4857 } 4858 if (len > SSIZE_MAX) 4859 /* 4860 * Although the len argument is size_t, the return argument 4861 * is ssize_t (which is signed). Therefore a size that won't 4862 * fit in ssize_t can't be returned. 4863 */ 4864 len = SSIZE_MAX; 4865 4866 /* Get the file structures for the file descriptors. */ 4867 error = fget_read(td, infd, &cap_read_rights, &infp); 4868 if (error != 0) 4869 goto out; 4870 if (infp->f_ops == &badfileops) { 4871 error = EBADF; 4872 goto out; 4873 } 4874 if (infp->f_vnode == NULL) { 4875 error = EINVAL; 4876 goto out; 4877 } 4878 error = fget_write(td, outfd, &cap_write_rights, &outfp); 4879 if (error != 0) 4880 goto out; 4881 if (outfp->f_ops == &badfileops) { 4882 error = EBADF; 4883 goto out; 4884 } 4885 if (outfp->f_vnode == NULL) { 4886 error = EINVAL; 4887 goto out; 4888 } 4889 4890 /* Set the offset pointers to the correct place. */ 4891 if (inoffp == NULL) 4892 inoffp = &infp->f_offset; 4893 if (outoffp == NULL) 4894 outoffp = &outfp->f_offset; 4895 savinoff = *inoffp; 4896 savoutoff = *outoffp; 4897 4898 invp = infp->f_vnode; 4899 outvp = outfp->f_vnode; 4900 /* Sanity check the f_flag bits. */ 4901 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 4902 (infp->f_flag & FREAD) == 0) { 4903 error = EBADF; 4904 goto out; 4905 } 4906 4907 /* If len == 0, just return 0. */ 4908 if (len == 0) 4909 goto out; 4910 4911 /* 4912 * If infp and outfp refer to the same file, the byte ranges cannot 4913 * overlap. 4914 */ 4915 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len > 4916 savoutoff) || (savinoff > savoutoff && savoutoff + len > 4917 savinoff))) { 4918 error = EINVAL; 4919 goto out; 4920 } 4921 4922 /* Range lock the byte ranges for both invp and outvp. */ 4923 for (;;) { 4924 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp + 4925 len); 4926 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp + 4927 len); 4928 if (rl_rcookie != NULL) 4929 break; 4930 vn_rangelock_unlock(outvp, rl_wcookie); 4931 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len); 4932 vn_rangelock_unlock(invp, rl_rcookie); 4933 } 4934 4935 retlen = len; 4936 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen, 4937 flags, infp->f_cred, outfp->f_cred, td); 4938 out: 4939 if (rl_rcookie != NULL) 4940 vn_rangelock_unlock(invp, rl_rcookie); 4941 if (rl_wcookie != NULL) 4942 vn_rangelock_unlock(outvp, rl_wcookie); 4943 if (savinoff != -1 && (error == EINTR || error == ERESTART)) { 4944 *inoffp = savinoff; 4945 *outoffp = savoutoff; 4946 } 4947 if (outfp != NULL) 4948 fdrop(outfp, td); 4949 if (infp != NULL) 4950 fdrop(infp, td); 4951 td->td_retval[0] = retlen; 4952 return (error); 4953 } 4954 4955 int 4956 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 4957 { 4958 off_t inoff, outoff, *inoffp, *outoffp; 4959 int error; 4960 4961 inoffp = outoffp = NULL; 4962 if (uap->inoffp != NULL) { 4963 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 4964 if (error != 0) 4965 return (error); 4966 inoffp = &inoff; 4967 } 4968 if (uap->outoffp != NULL) { 4969 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 4970 if (error != 0) 4971 return (error); 4972 outoffp = &outoff; 4973 } 4974 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 4975 outoffp, uap->len, uap->flags); 4976 if (error == 0 && uap->inoffp != NULL) 4977 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 4978 if (error == 0 && uap->outoffp != NULL) 4979 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 4980 return (error); 4981 } 4982