1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include "opt_capsicum.h" 43 #include "opt_ktrace.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/capsicum.h> 50 #include <sys/disk.h> 51 #include <sys/sysent.h> 52 #include <sys/malloc.h> 53 #include <sys/mount.h> 54 #include <sys/mutex.h> 55 #include <sys/sysproto.h> 56 #include <sys/namei.h> 57 #include <sys/filedesc.h> 58 #include <sys/kernel.h> 59 #include <sys/fcntl.h> 60 #include <sys/file.h> 61 #include <sys/filio.h> 62 #include <sys/limits.h> 63 #include <sys/linker.h> 64 #include <sys/rwlock.h> 65 #include <sys/sdt.h> 66 #include <sys/stat.h> 67 #include <sys/sx.h> 68 #include <sys/unistd.h> 69 #include <sys/vnode.h> 70 #include <sys/priv.h> 71 #include <sys/proc.h> 72 #include <sys/dirent.h> 73 #include <sys/jail.h> 74 #include <sys/syscallsubr.h> 75 #include <sys/sysctl.h> 76 #ifdef KTRACE 77 #include <sys/ktrace.h> 78 #endif 79 80 #include <machine/stdarg.h> 81 82 #include <security/audit/audit.h> 83 #include <security/mac/mac_framework.h> 84 85 #include <vm/vm.h> 86 #include <vm/vm_object.h> 87 #include <vm/vm_page.h> 88 #include <vm/uma.h> 89 90 #include <fs/devfs/devfs.h> 91 92 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 93 94 static int kern_chflagsat(struct thread *td, int fd, const char *path, 95 enum uio_seg pathseg, u_long flags, int atflag); 96 static int setfflags(struct thread *td, struct vnode *, u_long); 97 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 98 static int getutimens(const struct timespec *, enum uio_seg, 99 struct timespec *, int *); 100 static int setutimes(struct thread *td, struct vnode *, 101 const struct timespec *, int, int); 102 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 103 struct thread *td); 104 static int kern_fhlinkat(struct thread *td, int fd, const char *path, 105 enum uio_seg pathseg, fhandle_t *fhp); 106 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, 107 size_t count, struct thread *td); 108 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, 109 const char *path, enum uio_seg segflag); 110 111 static uint64_t 112 at2cnpflags(u_int at_flags, u_int mask) 113 { 114 u_int64_t res; 115 116 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) != 117 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)); 118 119 res = 0; 120 at_flags &= mask; 121 if ((at_flags & AT_RESOLVE_BENEATH) != 0) 122 res |= RBENEATH; 123 if ((at_flags & AT_SYMLINK_FOLLOW) != 0) 124 res |= FOLLOW; 125 /* NOFOLLOW is pseudo flag */ 126 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) { 127 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 128 FOLLOW; 129 } 130 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0) 131 res |= EMPTYPATH; 132 return (res); 133 } 134 135 int 136 kern_sync(struct thread *td) 137 { 138 struct mount *mp, *nmp; 139 int save; 140 141 mtx_lock(&mountlist_mtx); 142 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 143 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 144 nmp = TAILQ_NEXT(mp, mnt_list); 145 continue; 146 } 147 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 148 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 149 save = curthread_pflags_set(TDP_SYNCIO); 150 vfs_periodic(mp, MNT_NOWAIT); 151 VFS_SYNC(mp, MNT_NOWAIT); 152 curthread_pflags_restore(save); 153 vn_finished_write(mp); 154 } 155 mtx_lock(&mountlist_mtx); 156 nmp = TAILQ_NEXT(mp, mnt_list); 157 vfs_unbusy(mp); 158 } 159 mtx_unlock(&mountlist_mtx); 160 return (0); 161 } 162 163 /* 164 * Sync each mounted filesystem. 165 */ 166 #ifndef _SYS_SYSPROTO_H_ 167 struct sync_args { 168 int dummy; 169 }; 170 #endif 171 /* ARGSUSED */ 172 int 173 sys_sync(struct thread *td, struct sync_args *uap) 174 { 175 176 return (kern_sync(td)); 177 } 178 179 /* 180 * Change filesystem quotas. 181 */ 182 #ifndef _SYS_SYSPROTO_H_ 183 struct quotactl_args { 184 char *path; 185 int cmd; 186 int uid; 187 caddr_t arg; 188 }; 189 #endif 190 int 191 sys_quotactl(struct thread *td, struct quotactl_args *uap) 192 { 193 struct mount *mp; 194 struct nameidata nd; 195 int error; 196 bool mp_busy; 197 198 AUDIT_ARG_CMD(uap->cmd); 199 AUDIT_ARG_UID(uap->uid); 200 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 201 return (EPERM); 202 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 203 uap->path, td); 204 if ((error = namei(&nd)) != 0) 205 return (error); 206 NDFREE(&nd, NDF_ONLY_PNBUF); 207 mp = nd.ni_vp->v_mount; 208 vfs_ref(mp); 209 vput(nd.ni_vp); 210 error = vfs_busy(mp, 0); 211 if (error != 0) { 212 vfs_rel(mp); 213 return (error); 214 } 215 mp_busy = true; 216 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, &mp_busy); 217 218 /* 219 * Since quota on/off operations typically need to open quota 220 * files, the implementation may need to unbusy the mount point 221 * before calling into namei. Otherwise, unmount might be 222 * started between two vfs_busy() invocations (first is ours, 223 * second is from mount point cross-walk code in lookup()), 224 * causing deadlock. 225 * 226 * Avoid unbusying mp if the implementation indicates it has 227 * already done so. 228 */ 229 if (mp_busy) 230 vfs_unbusy(mp); 231 vfs_rel(mp); 232 return (error); 233 } 234 235 /* 236 * Used by statfs conversion routines to scale the block size up if 237 * necessary so that all of the block counts are <= 'max_size'. Note 238 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 239 * value of 'n'. 240 */ 241 void 242 statfs_scale_blocks(struct statfs *sf, long max_size) 243 { 244 uint64_t count; 245 int shift; 246 247 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 248 249 /* 250 * Attempt to scale the block counts to give a more accurate 251 * overview to userland of the ratio of free space to used 252 * space. To do this, find the largest block count and compute 253 * a divisor that lets it fit into a signed integer <= max_size. 254 */ 255 if (sf->f_bavail < 0) 256 count = -sf->f_bavail; 257 else 258 count = sf->f_bavail; 259 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 260 if (count <= max_size) 261 return; 262 263 count >>= flsl(max_size); 264 shift = 0; 265 while (count > 0) { 266 shift++; 267 count >>=1; 268 } 269 270 sf->f_bsize <<= shift; 271 sf->f_blocks >>= shift; 272 sf->f_bfree >>= shift; 273 sf->f_bavail >>= shift; 274 } 275 276 static int 277 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 278 { 279 int error; 280 281 if (mp == NULL) 282 return (EBADF); 283 error = vfs_busy(mp, 0); 284 vfs_rel(mp); 285 if (error != 0) 286 return (error); 287 #ifdef MAC 288 error = mac_mount_check_stat(td->td_ucred, mp); 289 if (error != 0) 290 goto out; 291 #endif 292 error = VFS_STATFS(mp, buf); 293 if (error != 0) 294 goto out; 295 if (priv_check_cred_vfs_generation(td->td_ucred)) { 296 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 297 prison_enforce_statfs(td->td_ucred, mp, buf); 298 } 299 out: 300 vfs_unbusy(mp); 301 return (error); 302 } 303 304 /* 305 * Get filesystem statistics. 306 */ 307 #ifndef _SYS_SYSPROTO_H_ 308 struct statfs_args { 309 char *path; 310 struct statfs *buf; 311 }; 312 #endif 313 int 314 sys_statfs(struct thread *td, struct statfs_args *uap) 315 { 316 struct statfs *sfp; 317 int error; 318 319 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 320 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 321 if (error == 0) 322 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 323 free(sfp, M_STATFS); 324 return (error); 325 } 326 327 int 328 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg, 329 struct statfs *buf) 330 { 331 struct mount *mp; 332 struct nameidata nd; 333 int error; 334 335 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 336 error = namei(&nd); 337 if (error != 0) 338 return (error); 339 mp = vfs_ref_from_vp(nd.ni_vp); 340 NDFREE_NOTHING(&nd); 341 vrele(nd.ni_vp); 342 return (kern_do_statfs(td, mp, buf)); 343 } 344 345 /* 346 * Get filesystem statistics. 347 */ 348 #ifndef _SYS_SYSPROTO_H_ 349 struct fstatfs_args { 350 int fd; 351 struct statfs *buf; 352 }; 353 #endif 354 int 355 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 356 { 357 struct statfs *sfp; 358 int error; 359 360 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 361 error = kern_fstatfs(td, uap->fd, sfp); 362 if (error == 0) 363 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 364 free(sfp, M_STATFS); 365 return (error); 366 } 367 368 int 369 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 370 { 371 struct file *fp; 372 struct mount *mp; 373 struct vnode *vp; 374 int error; 375 376 AUDIT_ARG_FD(fd); 377 error = getvnode_path(td, fd, &cap_fstatfs_rights, &fp); 378 if (error != 0) 379 return (error); 380 vp = fp->f_vnode; 381 #ifdef AUDIT 382 if (AUDITING_TD(td)) { 383 vn_lock(vp, LK_SHARED | LK_RETRY); 384 AUDIT_ARG_VNODE1(vp); 385 VOP_UNLOCK(vp); 386 } 387 #endif 388 mp = vfs_ref_from_vp(vp); 389 fdrop(fp, td); 390 return (kern_do_statfs(td, mp, buf)); 391 } 392 393 /* 394 * Get statistics on all filesystems. 395 */ 396 #ifndef _SYS_SYSPROTO_H_ 397 struct getfsstat_args { 398 struct statfs *buf; 399 long bufsize; 400 int mode; 401 }; 402 #endif 403 int 404 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 405 { 406 size_t count; 407 int error; 408 409 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 410 return (EINVAL); 411 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 412 UIO_USERSPACE, uap->mode); 413 if (error == 0) 414 td->td_retval[0] = count; 415 return (error); 416 } 417 418 /* 419 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 420 * The caller is responsible for freeing memory which will be allocated 421 * in '*buf'. 422 */ 423 int 424 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 425 size_t *countp, enum uio_seg bufseg, int mode) 426 { 427 struct mount *mp, *nmp; 428 struct statfs *sfsp, *sp, *sptmp, *tofree; 429 size_t count, maxcount; 430 int error; 431 432 switch (mode) { 433 case MNT_WAIT: 434 case MNT_NOWAIT: 435 break; 436 default: 437 if (bufseg == UIO_SYSSPACE) 438 *buf = NULL; 439 return (EINVAL); 440 } 441 restart: 442 maxcount = bufsize / sizeof(struct statfs); 443 if (bufsize == 0) { 444 sfsp = NULL; 445 tofree = NULL; 446 } else if (bufseg == UIO_USERSPACE) { 447 sfsp = *buf; 448 tofree = NULL; 449 } else /* if (bufseg == UIO_SYSSPACE) */ { 450 count = 0; 451 mtx_lock(&mountlist_mtx); 452 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 453 count++; 454 } 455 mtx_unlock(&mountlist_mtx); 456 if (maxcount > count) 457 maxcount = count; 458 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 459 M_STATFS, M_WAITOK); 460 } 461 462 count = 0; 463 464 /* 465 * If there is no target buffer they only want the count. 466 * 467 * This could be TAILQ_FOREACH but it is open-coded to match the original 468 * code below. 469 */ 470 if (sfsp == NULL) { 471 mtx_lock(&mountlist_mtx); 472 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 473 if (prison_canseemount(td->td_ucred, mp) != 0) { 474 nmp = TAILQ_NEXT(mp, mnt_list); 475 continue; 476 } 477 #ifdef MAC 478 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 479 nmp = TAILQ_NEXT(mp, mnt_list); 480 continue; 481 } 482 #endif 483 count++; 484 nmp = TAILQ_NEXT(mp, mnt_list); 485 } 486 mtx_unlock(&mountlist_mtx); 487 *countp = count; 488 return (0); 489 } 490 491 /* 492 * They want the entire thing. 493 * 494 * Short-circuit the corner case of no room for anything, avoids 495 * relocking below. 496 */ 497 if (maxcount < 1) { 498 goto out; 499 } 500 501 mtx_lock(&mountlist_mtx); 502 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 503 if (prison_canseemount(td->td_ucred, mp) != 0) { 504 nmp = TAILQ_NEXT(mp, mnt_list); 505 continue; 506 } 507 #ifdef MAC 508 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 509 nmp = TAILQ_NEXT(mp, mnt_list); 510 continue; 511 } 512 #endif 513 if (mode == MNT_WAIT) { 514 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 515 /* 516 * If vfs_busy() failed, and MBF_NOWAIT 517 * wasn't passed, then the mp is gone. 518 * Furthermore, because of MBF_MNTLSTLOCK, 519 * the mountlist_mtx was dropped. We have 520 * no other choice than to start over. 521 */ 522 mtx_unlock(&mountlist_mtx); 523 free(tofree, M_STATFS); 524 goto restart; 525 } 526 } else { 527 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 528 nmp = TAILQ_NEXT(mp, mnt_list); 529 continue; 530 } 531 } 532 sp = &mp->mnt_stat; 533 /* 534 * If MNT_NOWAIT is specified, do not refresh 535 * the fsstat cache. 536 */ 537 if (mode != MNT_NOWAIT) { 538 error = VFS_STATFS(mp, sp); 539 if (error != 0) { 540 mtx_lock(&mountlist_mtx); 541 nmp = TAILQ_NEXT(mp, mnt_list); 542 vfs_unbusy(mp); 543 continue; 544 } 545 } 546 if (priv_check_cred_vfs_generation(td->td_ucred)) { 547 sptmp = malloc(sizeof(struct statfs), M_STATFS, 548 M_WAITOK); 549 *sptmp = *sp; 550 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 551 prison_enforce_statfs(td->td_ucred, mp, sptmp); 552 sp = sptmp; 553 } else 554 sptmp = NULL; 555 if (bufseg == UIO_SYSSPACE) { 556 bcopy(sp, sfsp, sizeof(*sp)); 557 free(sptmp, M_STATFS); 558 } else /* if (bufseg == UIO_USERSPACE) */ { 559 error = copyout(sp, sfsp, sizeof(*sp)); 560 free(sptmp, M_STATFS); 561 if (error != 0) { 562 vfs_unbusy(mp); 563 return (error); 564 } 565 } 566 sfsp++; 567 count++; 568 569 if (count == maxcount) { 570 vfs_unbusy(mp); 571 goto out; 572 } 573 574 mtx_lock(&mountlist_mtx); 575 nmp = TAILQ_NEXT(mp, mnt_list); 576 vfs_unbusy(mp); 577 } 578 mtx_unlock(&mountlist_mtx); 579 out: 580 *countp = count; 581 return (0); 582 } 583 584 #ifdef COMPAT_FREEBSD4 585 /* 586 * Get old format filesystem statistics. 587 */ 588 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 589 590 #ifndef _SYS_SYSPROTO_H_ 591 struct freebsd4_statfs_args { 592 char *path; 593 struct ostatfs *buf; 594 }; 595 #endif 596 int 597 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 598 { 599 struct ostatfs osb; 600 struct statfs *sfp; 601 int error; 602 603 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 604 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 605 if (error == 0) { 606 freebsd4_cvtstatfs(sfp, &osb); 607 error = copyout(&osb, uap->buf, sizeof(osb)); 608 } 609 free(sfp, M_STATFS); 610 return (error); 611 } 612 613 /* 614 * Get filesystem statistics. 615 */ 616 #ifndef _SYS_SYSPROTO_H_ 617 struct freebsd4_fstatfs_args { 618 int fd; 619 struct ostatfs *buf; 620 }; 621 #endif 622 int 623 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 624 { 625 struct ostatfs osb; 626 struct statfs *sfp; 627 int error; 628 629 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 630 error = kern_fstatfs(td, uap->fd, sfp); 631 if (error == 0) { 632 freebsd4_cvtstatfs(sfp, &osb); 633 error = copyout(&osb, uap->buf, sizeof(osb)); 634 } 635 free(sfp, M_STATFS); 636 return (error); 637 } 638 639 /* 640 * Get statistics on all filesystems. 641 */ 642 #ifndef _SYS_SYSPROTO_H_ 643 struct freebsd4_getfsstat_args { 644 struct ostatfs *buf; 645 long bufsize; 646 int mode; 647 }; 648 #endif 649 int 650 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 651 { 652 struct statfs *buf, *sp; 653 struct ostatfs osb; 654 size_t count, size; 655 int error; 656 657 if (uap->bufsize < 0) 658 return (EINVAL); 659 count = uap->bufsize / sizeof(struct ostatfs); 660 if (count > SIZE_MAX / sizeof(struct statfs)) 661 return (EINVAL); 662 size = count * sizeof(struct statfs); 663 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 664 uap->mode); 665 if (error == 0) 666 td->td_retval[0] = count; 667 if (size != 0) { 668 sp = buf; 669 while (count != 0 && error == 0) { 670 freebsd4_cvtstatfs(sp, &osb); 671 error = copyout(&osb, uap->buf, sizeof(osb)); 672 sp++; 673 uap->buf++; 674 count--; 675 } 676 free(buf, M_STATFS); 677 } 678 return (error); 679 } 680 681 /* 682 * Implement fstatfs() for (NFS) file handles. 683 */ 684 #ifndef _SYS_SYSPROTO_H_ 685 struct freebsd4_fhstatfs_args { 686 struct fhandle *u_fhp; 687 struct ostatfs *buf; 688 }; 689 #endif 690 int 691 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 692 { 693 struct ostatfs osb; 694 struct statfs *sfp; 695 fhandle_t fh; 696 int error; 697 698 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 699 if (error != 0) 700 return (error); 701 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 702 error = kern_fhstatfs(td, fh, sfp); 703 if (error == 0) { 704 freebsd4_cvtstatfs(sfp, &osb); 705 error = copyout(&osb, uap->buf, sizeof(osb)); 706 } 707 free(sfp, M_STATFS); 708 return (error); 709 } 710 711 /* 712 * Convert a new format statfs structure to an old format statfs structure. 713 */ 714 static void 715 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 716 { 717 718 statfs_scale_blocks(nsp, LONG_MAX); 719 bzero(osp, sizeof(*osp)); 720 osp->f_bsize = nsp->f_bsize; 721 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 722 osp->f_blocks = nsp->f_blocks; 723 osp->f_bfree = nsp->f_bfree; 724 osp->f_bavail = nsp->f_bavail; 725 osp->f_files = MIN(nsp->f_files, LONG_MAX); 726 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 727 osp->f_owner = nsp->f_owner; 728 osp->f_type = nsp->f_type; 729 osp->f_flags = nsp->f_flags; 730 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 731 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 732 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 733 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 734 strlcpy(osp->f_fstypename, nsp->f_fstypename, 735 MIN(MFSNAMELEN, OMFSNAMELEN)); 736 strlcpy(osp->f_mntonname, nsp->f_mntonname, 737 MIN(MNAMELEN, OMNAMELEN)); 738 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 739 MIN(MNAMELEN, OMNAMELEN)); 740 osp->f_fsid = nsp->f_fsid; 741 } 742 #endif /* COMPAT_FREEBSD4 */ 743 744 #if defined(COMPAT_FREEBSD11) 745 /* 746 * Get old format filesystem statistics. 747 */ 748 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 749 750 int 751 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 752 { 753 struct freebsd11_statfs osb; 754 struct statfs *sfp; 755 int error; 756 757 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 758 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 759 if (error == 0) { 760 freebsd11_cvtstatfs(sfp, &osb); 761 error = copyout(&osb, uap->buf, sizeof(osb)); 762 } 763 free(sfp, M_STATFS); 764 return (error); 765 } 766 767 /* 768 * Get filesystem statistics. 769 */ 770 int 771 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 772 { 773 struct freebsd11_statfs osb; 774 struct statfs *sfp; 775 int error; 776 777 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 778 error = kern_fstatfs(td, uap->fd, sfp); 779 if (error == 0) { 780 freebsd11_cvtstatfs(sfp, &osb); 781 error = copyout(&osb, uap->buf, sizeof(osb)); 782 } 783 free(sfp, M_STATFS); 784 return (error); 785 } 786 787 /* 788 * Get statistics on all filesystems. 789 */ 790 int 791 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 792 { 793 struct freebsd11_statfs osb; 794 struct statfs *buf, *sp; 795 size_t count, size; 796 int error; 797 798 count = uap->bufsize / sizeof(struct ostatfs); 799 size = count * sizeof(struct statfs); 800 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 801 uap->mode); 802 if (error == 0) 803 td->td_retval[0] = count; 804 if (size > 0) { 805 sp = buf; 806 while (count > 0 && error == 0) { 807 freebsd11_cvtstatfs(sp, &osb); 808 error = copyout(&osb, uap->buf, sizeof(osb)); 809 sp++; 810 uap->buf++; 811 count--; 812 } 813 free(buf, M_STATFS); 814 } 815 return (error); 816 } 817 818 /* 819 * Implement fstatfs() for (NFS) file handles. 820 */ 821 int 822 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 823 { 824 struct freebsd11_statfs osb; 825 struct statfs *sfp; 826 fhandle_t fh; 827 int error; 828 829 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 830 if (error) 831 return (error); 832 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 833 error = kern_fhstatfs(td, fh, sfp); 834 if (error == 0) { 835 freebsd11_cvtstatfs(sfp, &osb); 836 error = copyout(&osb, uap->buf, sizeof(osb)); 837 } 838 free(sfp, M_STATFS); 839 return (error); 840 } 841 842 /* 843 * Convert a new format statfs structure to an old format statfs structure. 844 */ 845 static void 846 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 847 { 848 849 bzero(osp, sizeof(*osp)); 850 osp->f_version = FREEBSD11_STATFS_VERSION; 851 osp->f_type = nsp->f_type; 852 osp->f_flags = nsp->f_flags; 853 osp->f_bsize = nsp->f_bsize; 854 osp->f_iosize = nsp->f_iosize; 855 osp->f_blocks = nsp->f_blocks; 856 osp->f_bfree = nsp->f_bfree; 857 osp->f_bavail = nsp->f_bavail; 858 osp->f_files = nsp->f_files; 859 osp->f_ffree = nsp->f_ffree; 860 osp->f_syncwrites = nsp->f_syncwrites; 861 osp->f_asyncwrites = nsp->f_asyncwrites; 862 osp->f_syncreads = nsp->f_syncreads; 863 osp->f_asyncreads = nsp->f_asyncreads; 864 osp->f_namemax = nsp->f_namemax; 865 osp->f_owner = nsp->f_owner; 866 osp->f_fsid = nsp->f_fsid; 867 strlcpy(osp->f_fstypename, nsp->f_fstypename, 868 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 869 strlcpy(osp->f_mntonname, nsp->f_mntonname, 870 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 871 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 872 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 873 } 874 #endif /* COMPAT_FREEBSD11 */ 875 876 /* 877 * Change current working directory to a given file descriptor. 878 */ 879 #ifndef _SYS_SYSPROTO_H_ 880 struct fchdir_args { 881 int fd; 882 }; 883 #endif 884 int 885 sys_fchdir(struct thread *td, struct fchdir_args *uap) 886 { 887 struct vnode *vp, *tdp; 888 struct mount *mp; 889 struct file *fp; 890 int error; 891 892 AUDIT_ARG_FD(uap->fd); 893 error = getvnode_path(td, uap->fd, &cap_fchdir_rights, 894 &fp); 895 if (error != 0) 896 return (error); 897 vp = fp->f_vnode; 898 vref(vp); 899 fdrop(fp, td); 900 vn_lock(vp, LK_SHARED | LK_RETRY); 901 AUDIT_ARG_VNODE1(vp); 902 error = change_dir(vp, td); 903 while (!error && (mp = vp->v_mountedhere) != NULL) { 904 if (vfs_busy(mp, 0)) 905 continue; 906 error = VFS_ROOT(mp, LK_SHARED, &tdp); 907 vfs_unbusy(mp); 908 if (error != 0) 909 break; 910 vput(vp); 911 vp = tdp; 912 } 913 if (error != 0) { 914 vput(vp); 915 return (error); 916 } 917 VOP_UNLOCK(vp); 918 pwd_chdir(td, vp); 919 return (0); 920 } 921 922 /* 923 * Change current working directory (``.''). 924 */ 925 #ifndef _SYS_SYSPROTO_H_ 926 struct chdir_args { 927 char *path; 928 }; 929 #endif 930 int 931 sys_chdir(struct thread *td, struct chdir_args *uap) 932 { 933 934 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 935 } 936 937 int 938 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg) 939 { 940 struct nameidata nd; 941 int error; 942 943 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 944 pathseg, path, td); 945 if ((error = namei(&nd)) != 0) 946 return (error); 947 if ((error = change_dir(nd.ni_vp, td)) != 0) { 948 vput(nd.ni_vp); 949 NDFREE_NOTHING(&nd); 950 return (error); 951 } 952 VOP_UNLOCK(nd.ni_vp); 953 NDFREE_NOTHING(&nd); 954 pwd_chdir(td, nd.ni_vp); 955 return (0); 956 } 957 958 static int unprivileged_chroot = 0; 959 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_chroot, CTLFLAG_RW, 960 &unprivileged_chroot, 0, 961 "Unprivileged processes can use chroot(2)"); 962 /* 963 * Change notion of root (``/'') directory. 964 */ 965 #ifndef _SYS_SYSPROTO_H_ 966 struct chroot_args { 967 char *path; 968 }; 969 #endif 970 int 971 sys_chroot(struct thread *td, struct chroot_args *uap) 972 { 973 struct nameidata nd; 974 struct proc *p; 975 int error; 976 977 error = priv_check(td, PRIV_VFS_CHROOT); 978 if (error != 0) { 979 p = td->td_proc; 980 PROC_LOCK(p); 981 if (unprivileged_chroot == 0 || 982 (p->p_flag2 & P2_NO_NEW_PRIVS) == 0) { 983 PROC_UNLOCK(p); 984 return (error); 985 } 986 PROC_UNLOCK(p); 987 } 988 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 989 UIO_USERSPACE, uap->path, td); 990 error = namei(&nd); 991 if (error != 0) 992 goto error; 993 error = change_dir(nd.ni_vp, td); 994 if (error != 0) 995 goto e_vunlock; 996 #ifdef MAC 997 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 998 if (error != 0) 999 goto e_vunlock; 1000 #endif 1001 VOP_UNLOCK(nd.ni_vp); 1002 error = pwd_chroot(td, nd.ni_vp); 1003 vrele(nd.ni_vp); 1004 NDFREE_NOTHING(&nd); 1005 return (error); 1006 e_vunlock: 1007 vput(nd.ni_vp); 1008 error: 1009 NDFREE_NOTHING(&nd); 1010 return (error); 1011 } 1012 1013 /* 1014 * Common routine for chroot and chdir. Callers must provide a locked vnode 1015 * instance. 1016 */ 1017 int 1018 change_dir(struct vnode *vp, struct thread *td) 1019 { 1020 #ifdef MAC 1021 int error; 1022 #endif 1023 1024 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 1025 if (vp->v_type != VDIR) 1026 return (ENOTDIR); 1027 #ifdef MAC 1028 error = mac_vnode_check_chdir(td->td_ucred, vp); 1029 if (error != 0) 1030 return (error); 1031 #endif 1032 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 1033 } 1034 1035 static __inline void 1036 flags_to_rights(int flags, cap_rights_t *rightsp) 1037 { 1038 if (flags & O_EXEC) { 1039 cap_rights_set_one(rightsp, CAP_FEXECVE); 1040 if (flags & O_PATH) 1041 return; 1042 } else { 1043 switch ((flags & O_ACCMODE)) { 1044 case O_RDONLY: 1045 cap_rights_set_one(rightsp, CAP_READ); 1046 break; 1047 case O_RDWR: 1048 cap_rights_set_one(rightsp, CAP_READ); 1049 /* FALLTHROUGH */ 1050 case O_WRONLY: 1051 cap_rights_set_one(rightsp, CAP_WRITE); 1052 if (!(flags & (O_APPEND | O_TRUNC))) 1053 cap_rights_set_one(rightsp, CAP_SEEK); 1054 break; 1055 } 1056 } 1057 1058 if (flags & O_CREAT) 1059 cap_rights_set_one(rightsp, CAP_CREATE); 1060 1061 if (flags & O_TRUNC) 1062 cap_rights_set_one(rightsp, CAP_FTRUNCATE); 1063 1064 if (flags & (O_SYNC | O_FSYNC)) 1065 cap_rights_set_one(rightsp, CAP_FSYNC); 1066 1067 if (flags & (O_EXLOCK | O_SHLOCK)) 1068 cap_rights_set_one(rightsp, CAP_FLOCK); 1069 } 1070 1071 /* 1072 * Check permissions, allocate an open file structure, and call the device 1073 * open routine if any. 1074 */ 1075 #ifndef _SYS_SYSPROTO_H_ 1076 struct open_args { 1077 char *path; 1078 int flags; 1079 int mode; 1080 }; 1081 #endif 1082 int 1083 sys_open(struct thread *td, struct open_args *uap) 1084 { 1085 1086 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1087 uap->flags, uap->mode)); 1088 } 1089 1090 #ifndef _SYS_SYSPROTO_H_ 1091 struct openat_args { 1092 int fd; 1093 char *path; 1094 int flag; 1095 int mode; 1096 }; 1097 #endif 1098 int 1099 sys_openat(struct thread *td, struct openat_args *uap) 1100 { 1101 1102 AUDIT_ARG_FD(uap->fd); 1103 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1104 uap->mode)); 1105 } 1106 1107 int 1108 kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1109 int flags, int mode) 1110 { 1111 struct proc *p = td->td_proc; 1112 struct filedesc *fdp; 1113 struct pwddesc *pdp; 1114 struct file *fp; 1115 struct vnode *vp; 1116 struct nameidata nd; 1117 cap_rights_t rights; 1118 int cmode, error, indx; 1119 1120 indx = -1; 1121 fdp = p->p_fd; 1122 pdp = p->p_pd; 1123 1124 AUDIT_ARG_FFLAGS(flags); 1125 AUDIT_ARG_MODE(mode); 1126 cap_rights_init_one(&rights, CAP_LOOKUP); 1127 flags_to_rights(flags, &rights); 1128 1129 /* 1130 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1131 * may be specified. On the other hand, for O_PATH any mode 1132 * except O_EXEC is ignored. 1133 */ 1134 if ((flags & O_PATH) != 0) { 1135 flags &= ~(O_CREAT | O_ACCMODE); 1136 } else if ((flags & O_EXEC) != 0) { 1137 if (flags & O_ACCMODE) 1138 return (EINVAL); 1139 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1140 return (EINVAL); 1141 } else { 1142 flags = FFLAGS(flags); 1143 } 1144 1145 /* 1146 * Allocate a file structure. The descriptor to reference it 1147 * is allocated and used by finstall_refed() below. 1148 */ 1149 error = falloc_noinstall(td, &fp); 1150 if (error != 0) 1151 return (error); 1152 /* Set the flags early so the finit in devfs can pick them up. */ 1153 fp->f_flag = flags & FMASK; 1154 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT; 1155 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1156 &rights, td); 1157 td->td_dupfd = -1; /* XXX check for fdopen */ 1158 error = vn_open(&nd, &flags, cmode, fp); 1159 if (error != 0) { 1160 /* 1161 * If the vn_open replaced the method vector, something 1162 * wonderous happened deep below and we just pass it up 1163 * pretending we know what we do. 1164 */ 1165 if (error == ENXIO && fp->f_ops != &badfileops) { 1166 MPASS((flags & O_PATH) == 0); 1167 goto success; 1168 } 1169 1170 /* 1171 * Handle special fdopen() case. bleh. 1172 * 1173 * Don't do this for relative (capability) lookups; we don't 1174 * understand exactly what would happen, and we don't think 1175 * that it ever should. 1176 */ 1177 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 && 1178 (error == ENODEV || error == ENXIO) && 1179 td->td_dupfd >= 0) { 1180 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1181 &indx); 1182 if (error == 0) 1183 goto success; 1184 } 1185 1186 goto bad; 1187 } 1188 td->td_dupfd = 0; 1189 NDFREE(&nd, NDF_ONLY_PNBUF); 1190 vp = nd.ni_vp; 1191 1192 /* 1193 * Store the vnode, for any f_type. Typically, the vnode use 1194 * count is decremented by direct call to vn_closefile() for 1195 * files that switched type in the cdevsw fdopen() method. 1196 */ 1197 fp->f_vnode = vp; 1198 1199 /* 1200 * If the file wasn't claimed by devfs bind it to the normal 1201 * vnode operations here. 1202 */ 1203 if (fp->f_ops == &badfileops) { 1204 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0, 1205 ("Unexpected fifo fp %p vp %p", fp, vp)); 1206 if ((flags & O_PATH) != 0) { 1207 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED), 1208 DTYPE_VNODE, NULL, &path_fileops); 1209 vhold(vp); 1210 vunref(vp); 1211 } else { 1212 finit_vnode(fp, flags, NULL, &vnops); 1213 } 1214 } 1215 1216 VOP_UNLOCK(vp); 1217 if (flags & O_TRUNC) { 1218 error = fo_truncate(fp, 0, td->td_ucred, td); 1219 if (error != 0) 1220 goto bad; 1221 } 1222 success: 1223 /* 1224 * If we haven't already installed the FD (for dupfdopen), do so now. 1225 */ 1226 if (indx == -1) { 1227 struct filecaps *fcaps; 1228 1229 #ifdef CAPABILITIES 1230 if ((nd.ni_resflags & NIRES_STRICTREL) != 0) 1231 fcaps = &nd.ni_filecaps; 1232 else 1233 #endif 1234 fcaps = NULL; 1235 error = finstall_refed(td, fp, &indx, flags, fcaps); 1236 /* On success finstall_refed() consumes fcaps. */ 1237 if (error != 0) { 1238 filecaps_free(&nd.ni_filecaps); 1239 goto bad; 1240 } 1241 } else { 1242 filecaps_free(&nd.ni_filecaps); 1243 falloc_abort(td, fp); 1244 } 1245 1246 td->td_retval[0] = indx; 1247 return (0); 1248 bad: 1249 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1250 falloc_abort(td, fp); 1251 return (error); 1252 } 1253 1254 #ifdef COMPAT_43 1255 /* 1256 * Create a file. 1257 */ 1258 #ifndef _SYS_SYSPROTO_H_ 1259 struct ocreat_args { 1260 char *path; 1261 int mode; 1262 }; 1263 #endif 1264 int 1265 ocreat(struct thread *td, struct ocreat_args *uap) 1266 { 1267 1268 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1269 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1270 } 1271 #endif /* COMPAT_43 */ 1272 1273 /* 1274 * Create a special file. 1275 */ 1276 #ifndef _SYS_SYSPROTO_H_ 1277 struct mknodat_args { 1278 int fd; 1279 char *path; 1280 mode_t mode; 1281 dev_t dev; 1282 }; 1283 #endif 1284 int 1285 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1286 { 1287 1288 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1289 uap->dev)); 1290 } 1291 1292 #if defined(COMPAT_FREEBSD11) 1293 int 1294 freebsd11_mknod(struct thread *td, 1295 struct freebsd11_mknod_args *uap) 1296 { 1297 1298 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1299 uap->mode, uap->dev)); 1300 } 1301 1302 int 1303 freebsd11_mknodat(struct thread *td, 1304 struct freebsd11_mknodat_args *uap) 1305 { 1306 1307 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1308 uap->dev)); 1309 } 1310 #endif /* COMPAT_FREEBSD11 */ 1311 1312 int 1313 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1314 int mode, dev_t dev) 1315 { 1316 struct vnode *vp; 1317 struct mount *mp; 1318 struct vattr vattr; 1319 struct nameidata nd; 1320 int error, whiteout = 0; 1321 1322 AUDIT_ARG_MODE(mode); 1323 AUDIT_ARG_DEV(dev); 1324 switch (mode & S_IFMT) { 1325 case S_IFCHR: 1326 case S_IFBLK: 1327 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1328 if (error == 0 && dev == VNOVAL) 1329 error = EINVAL; 1330 break; 1331 case S_IFWHT: 1332 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1333 break; 1334 case S_IFIFO: 1335 if (dev == 0) 1336 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1337 /* FALLTHROUGH */ 1338 default: 1339 error = EINVAL; 1340 break; 1341 } 1342 if (error != 0) 1343 return (error); 1344 NDPREINIT(&nd); 1345 restart: 1346 bwillwrite(); 1347 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1348 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1349 td); 1350 if ((error = namei(&nd)) != 0) 1351 return (error); 1352 vp = nd.ni_vp; 1353 if (vp != NULL) { 1354 NDFREE(&nd, NDF_ONLY_PNBUF); 1355 if (vp == nd.ni_dvp) 1356 vrele(nd.ni_dvp); 1357 else 1358 vput(nd.ni_dvp); 1359 vrele(vp); 1360 return (EEXIST); 1361 } else { 1362 VATTR_NULL(&vattr); 1363 vattr.va_mode = (mode & ALLPERMS) & 1364 ~td->td_proc->p_pd->pd_cmask; 1365 vattr.va_rdev = dev; 1366 whiteout = 0; 1367 1368 switch (mode & S_IFMT) { 1369 case S_IFCHR: 1370 vattr.va_type = VCHR; 1371 break; 1372 case S_IFBLK: 1373 vattr.va_type = VBLK; 1374 break; 1375 case S_IFWHT: 1376 whiteout = 1; 1377 break; 1378 default: 1379 panic("kern_mknod: invalid mode"); 1380 } 1381 } 1382 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1383 NDFREE(&nd, NDF_ONLY_PNBUF); 1384 vput(nd.ni_dvp); 1385 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1386 return (error); 1387 goto restart; 1388 } 1389 #ifdef MAC 1390 if (error == 0 && !whiteout) 1391 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1392 &nd.ni_cnd, &vattr); 1393 #endif 1394 if (error == 0) { 1395 if (whiteout) 1396 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1397 else { 1398 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1399 &nd.ni_cnd, &vattr); 1400 } 1401 } 1402 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL, 1403 true); 1404 vn_finished_write(mp); 1405 NDFREE(&nd, NDF_ONLY_PNBUF); 1406 if (error == ERELOOKUP) 1407 goto restart; 1408 return (error); 1409 } 1410 1411 /* 1412 * Create a named pipe. 1413 */ 1414 #ifndef _SYS_SYSPROTO_H_ 1415 struct mkfifo_args { 1416 char *path; 1417 int mode; 1418 }; 1419 #endif 1420 int 1421 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1422 { 1423 1424 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1425 uap->mode)); 1426 } 1427 1428 #ifndef _SYS_SYSPROTO_H_ 1429 struct mkfifoat_args { 1430 int fd; 1431 char *path; 1432 mode_t mode; 1433 }; 1434 #endif 1435 int 1436 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1437 { 1438 1439 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1440 uap->mode)); 1441 } 1442 1443 int 1444 kern_mkfifoat(struct thread *td, int fd, const char *path, 1445 enum uio_seg pathseg, int mode) 1446 { 1447 struct mount *mp; 1448 struct vattr vattr; 1449 struct nameidata nd; 1450 int error; 1451 1452 AUDIT_ARG_MODE(mode); 1453 NDPREINIT(&nd); 1454 restart: 1455 bwillwrite(); 1456 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1457 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1458 td); 1459 if ((error = namei(&nd)) != 0) 1460 return (error); 1461 if (nd.ni_vp != NULL) { 1462 NDFREE(&nd, NDF_ONLY_PNBUF); 1463 if (nd.ni_vp == nd.ni_dvp) 1464 vrele(nd.ni_dvp); 1465 else 1466 vput(nd.ni_dvp); 1467 vrele(nd.ni_vp); 1468 return (EEXIST); 1469 } 1470 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1471 NDFREE(&nd, NDF_ONLY_PNBUF); 1472 vput(nd.ni_dvp); 1473 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1474 return (error); 1475 goto restart; 1476 } 1477 VATTR_NULL(&vattr); 1478 vattr.va_type = VFIFO; 1479 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask; 1480 #ifdef MAC 1481 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1482 &vattr); 1483 if (error != 0) 1484 goto out; 1485 #endif 1486 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1487 #ifdef MAC 1488 out: 1489 #endif 1490 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1491 vn_finished_write(mp); 1492 NDFREE(&nd, NDF_ONLY_PNBUF); 1493 if (error == ERELOOKUP) 1494 goto restart; 1495 return (error); 1496 } 1497 1498 /* 1499 * Make a hard file link. 1500 */ 1501 #ifndef _SYS_SYSPROTO_H_ 1502 struct link_args { 1503 char *path; 1504 char *link; 1505 }; 1506 #endif 1507 int 1508 sys_link(struct thread *td, struct link_args *uap) 1509 { 1510 1511 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1512 UIO_USERSPACE, AT_SYMLINK_FOLLOW)); 1513 } 1514 1515 #ifndef _SYS_SYSPROTO_H_ 1516 struct linkat_args { 1517 int fd1; 1518 char *path1; 1519 int fd2; 1520 char *path2; 1521 int flag; 1522 }; 1523 #endif 1524 int 1525 sys_linkat(struct thread *td, struct linkat_args *uap) 1526 { 1527 int flag; 1528 1529 flag = uap->flag; 1530 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | 1531 AT_EMPTY_PATH)) != 0) 1532 return (EINVAL); 1533 1534 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1535 UIO_USERSPACE, flag)); 1536 } 1537 1538 int hardlink_check_uid = 0; 1539 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1540 &hardlink_check_uid, 0, 1541 "Unprivileged processes cannot create hard links to files owned by other " 1542 "users"); 1543 static int hardlink_check_gid = 0; 1544 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1545 &hardlink_check_gid, 0, 1546 "Unprivileged processes cannot create hard links to files owned by other " 1547 "groups"); 1548 1549 static int 1550 can_hardlink(struct vnode *vp, struct ucred *cred) 1551 { 1552 struct vattr va; 1553 int error; 1554 1555 if (!hardlink_check_uid && !hardlink_check_gid) 1556 return (0); 1557 1558 error = VOP_GETATTR(vp, &va, cred); 1559 if (error != 0) 1560 return (error); 1561 1562 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1563 error = priv_check_cred(cred, PRIV_VFS_LINK); 1564 if (error != 0) 1565 return (error); 1566 } 1567 1568 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1569 error = priv_check_cred(cred, PRIV_VFS_LINK); 1570 if (error != 0) 1571 return (error); 1572 } 1573 1574 return (0); 1575 } 1576 1577 int 1578 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1579 const char *path2, enum uio_seg segflag, int flag) 1580 { 1581 struct nameidata nd; 1582 int error; 1583 1584 NDPREINIT(&nd); 1585 do { 1586 bwillwrite(); 1587 NDINIT_ATRIGHTS(&nd, LOOKUP, AUDITVNODE1 | at2cnpflags(flag, 1588 AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | AT_EMPTY_PATH), 1589 segflag, path1, fd1, &cap_linkat_source_rights, td); 1590 if ((error = namei(&nd)) != 0) 1591 return (error); 1592 NDFREE(&nd, NDF_ONLY_PNBUF); 1593 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) { 1594 error = priv_check(td, PRIV_VFS_FHOPEN); 1595 if (error != 0) { 1596 vrele(nd.ni_vp); 1597 return (error); 1598 } 1599 } 1600 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1601 } while (error == EAGAIN || error == ERELOOKUP); 1602 return (error); 1603 } 1604 1605 static int 1606 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1607 enum uio_seg segflag) 1608 { 1609 struct nameidata nd; 1610 struct mount *mp; 1611 int error; 1612 1613 if (vp->v_type == VDIR) { 1614 vrele(vp); 1615 return (EPERM); /* POSIX */ 1616 } 1617 NDINIT_ATRIGHTS(&nd, CREATE, 1618 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1619 &cap_linkat_target_rights, td); 1620 if ((error = namei(&nd)) == 0) { 1621 if (nd.ni_vp != NULL) { 1622 NDFREE(&nd, NDF_ONLY_PNBUF); 1623 if (nd.ni_dvp == nd.ni_vp) 1624 vrele(nd.ni_dvp); 1625 else 1626 vput(nd.ni_dvp); 1627 vrele(nd.ni_vp); 1628 vrele(vp); 1629 return (EEXIST); 1630 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1631 /* 1632 * Cross-device link. No need to recheck 1633 * vp->v_type, since it cannot change, except 1634 * to VBAD. 1635 */ 1636 NDFREE(&nd, NDF_ONLY_PNBUF); 1637 vput(nd.ni_dvp); 1638 vrele(vp); 1639 return (EXDEV); 1640 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1641 error = can_hardlink(vp, td->td_ucred); 1642 #ifdef MAC 1643 if (error == 0) 1644 error = mac_vnode_check_link(td->td_ucred, 1645 nd.ni_dvp, vp, &nd.ni_cnd); 1646 #endif 1647 if (error != 0) { 1648 vput(vp); 1649 vput(nd.ni_dvp); 1650 NDFREE(&nd, NDF_ONLY_PNBUF); 1651 return (error); 1652 } 1653 error = vn_start_write(vp, &mp, V_NOWAIT); 1654 if (error != 0) { 1655 vput(vp); 1656 vput(nd.ni_dvp); 1657 NDFREE(&nd, NDF_ONLY_PNBUF); 1658 error = vn_start_write(NULL, &mp, 1659 V_XSLEEP | PCATCH); 1660 if (error != 0) 1661 return (error); 1662 return (EAGAIN); 1663 } 1664 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1665 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true); 1666 vn_finished_write(mp); 1667 NDFREE(&nd, NDF_ONLY_PNBUF); 1668 vp = NULL; 1669 } else { 1670 vput(nd.ni_dvp); 1671 NDFREE(&nd, NDF_ONLY_PNBUF); 1672 vrele(vp); 1673 return (EAGAIN); 1674 } 1675 } 1676 if (vp != NULL) 1677 vrele(vp); 1678 return (error); 1679 } 1680 1681 /* 1682 * Make a symbolic link. 1683 */ 1684 #ifndef _SYS_SYSPROTO_H_ 1685 struct symlink_args { 1686 char *path; 1687 char *link; 1688 }; 1689 #endif 1690 int 1691 sys_symlink(struct thread *td, struct symlink_args *uap) 1692 { 1693 1694 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1695 UIO_USERSPACE)); 1696 } 1697 1698 #ifndef _SYS_SYSPROTO_H_ 1699 struct symlinkat_args { 1700 char *path; 1701 int fd; 1702 char *path2; 1703 }; 1704 #endif 1705 int 1706 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1707 { 1708 1709 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1710 UIO_USERSPACE)); 1711 } 1712 1713 int 1714 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1715 enum uio_seg segflg) 1716 { 1717 struct mount *mp; 1718 struct vattr vattr; 1719 const char *syspath; 1720 char *tmppath; 1721 struct nameidata nd; 1722 int error; 1723 1724 if (segflg == UIO_SYSSPACE) { 1725 syspath = path1; 1726 } else { 1727 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1728 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1729 goto out; 1730 syspath = tmppath; 1731 } 1732 AUDIT_ARG_TEXT(syspath); 1733 NDPREINIT(&nd); 1734 restart: 1735 bwillwrite(); 1736 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1737 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1738 td); 1739 if ((error = namei(&nd)) != 0) 1740 goto out; 1741 if (nd.ni_vp) { 1742 NDFREE(&nd, NDF_ONLY_PNBUF); 1743 if (nd.ni_vp == nd.ni_dvp) 1744 vrele(nd.ni_dvp); 1745 else 1746 vput(nd.ni_dvp); 1747 vrele(nd.ni_vp); 1748 nd.ni_vp = NULL; 1749 error = EEXIST; 1750 goto out; 1751 } 1752 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1753 NDFREE(&nd, NDF_ONLY_PNBUF); 1754 vput(nd.ni_dvp); 1755 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1756 goto out; 1757 goto restart; 1758 } 1759 VATTR_NULL(&vattr); 1760 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask; 1761 #ifdef MAC 1762 vattr.va_type = VLNK; 1763 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1764 &vattr); 1765 if (error != 0) 1766 goto out2; 1767 #endif 1768 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1769 #ifdef MAC 1770 out2: 1771 #endif 1772 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1773 vn_finished_write(mp); 1774 NDFREE(&nd, NDF_ONLY_PNBUF); 1775 if (error == ERELOOKUP) 1776 goto restart; 1777 out: 1778 if (segflg != UIO_SYSSPACE) 1779 uma_zfree(namei_zone, tmppath); 1780 return (error); 1781 } 1782 1783 /* 1784 * Delete a whiteout from the filesystem. 1785 */ 1786 #ifndef _SYS_SYSPROTO_H_ 1787 struct undelete_args { 1788 char *path; 1789 }; 1790 #endif 1791 int 1792 sys_undelete(struct thread *td, struct undelete_args *uap) 1793 { 1794 struct mount *mp; 1795 struct nameidata nd; 1796 int error; 1797 1798 NDPREINIT(&nd); 1799 restart: 1800 bwillwrite(); 1801 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1802 UIO_USERSPACE, uap->path, td); 1803 error = namei(&nd); 1804 if (error != 0) 1805 return (error); 1806 1807 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1808 NDFREE(&nd, NDF_ONLY_PNBUF); 1809 if (nd.ni_vp == nd.ni_dvp) 1810 vrele(nd.ni_dvp); 1811 else 1812 vput(nd.ni_dvp); 1813 if (nd.ni_vp) 1814 vrele(nd.ni_vp); 1815 return (EEXIST); 1816 } 1817 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1818 NDFREE(&nd, NDF_ONLY_PNBUF); 1819 vput(nd.ni_dvp); 1820 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1821 return (error); 1822 goto restart; 1823 } 1824 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1825 NDFREE(&nd, NDF_ONLY_PNBUF); 1826 vput(nd.ni_dvp); 1827 vn_finished_write(mp); 1828 if (error == ERELOOKUP) 1829 goto restart; 1830 return (error); 1831 } 1832 1833 /* 1834 * Delete a name from the filesystem. 1835 */ 1836 #ifndef _SYS_SYSPROTO_H_ 1837 struct unlink_args { 1838 char *path; 1839 }; 1840 #endif 1841 int 1842 sys_unlink(struct thread *td, struct unlink_args *uap) 1843 { 1844 1845 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1846 0, 0)); 1847 } 1848 1849 static int 1850 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1851 int flag, enum uio_seg pathseg, ino_t oldinum) 1852 { 1853 1854 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0) 1855 return (EINVAL); 1856 1857 if ((flag & AT_REMOVEDIR) != 0) 1858 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1859 1860 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1861 } 1862 1863 #ifndef _SYS_SYSPROTO_H_ 1864 struct unlinkat_args { 1865 int fd; 1866 char *path; 1867 int flag; 1868 }; 1869 #endif 1870 int 1871 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1872 { 1873 1874 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1875 UIO_USERSPACE, 0)); 1876 } 1877 1878 #ifndef _SYS_SYSPROTO_H_ 1879 struct funlinkat_args { 1880 int dfd; 1881 const char *path; 1882 int fd; 1883 int flag; 1884 }; 1885 #endif 1886 int 1887 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 1888 { 1889 1890 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 1891 UIO_USERSPACE, 0)); 1892 } 1893 1894 int 1895 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 1896 enum uio_seg pathseg, int flag, ino_t oldinum) 1897 { 1898 struct mount *mp; 1899 struct file *fp; 1900 struct vnode *vp; 1901 struct nameidata nd; 1902 struct stat sb; 1903 int error; 1904 1905 fp = NULL; 1906 if (fd != FD_NONE) { 1907 error = getvnode_path(td, fd, &cap_no_rights, &fp); 1908 if (error != 0) 1909 return (error); 1910 } 1911 1912 NDPREINIT(&nd); 1913 restart: 1914 bwillwrite(); 1915 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1916 at2cnpflags(flag, AT_RESOLVE_BENEATH), 1917 pathseg, path, dfd, &cap_unlinkat_rights, td); 1918 if ((error = namei(&nd)) != 0) { 1919 if (error == EINVAL) 1920 error = EPERM; 1921 goto fdout; 1922 } 1923 vp = nd.ni_vp; 1924 if (vp->v_type == VDIR && oldinum == 0) { 1925 error = EPERM; /* POSIX */ 1926 } else if (oldinum != 0 && 1927 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1928 sb.st_ino != oldinum) { 1929 error = EIDRM; /* Identifier removed */ 1930 } else if (fp != NULL && fp->f_vnode != vp) { 1931 if (VN_IS_DOOMED(fp->f_vnode)) 1932 error = EBADF; 1933 else 1934 error = EDEADLK; 1935 } else { 1936 /* 1937 * The root of a mounted filesystem cannot be deleted. 1938 * 1939 * XXX: can this only be a VDIR case? 1940 */ 1941 if (vp->v_vflag & VV_ROOT) 1942 error = EBUSY; 1943 } 1944 if (error == 0) { 1945 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1946 NDFREE(&nd, NDF_ONLY_PNBUF); 1947 vput(nd.ni_dvp); 1948 if (vp == nd.ni_dvp) 1949 vrele(vp); 1950 else 1951 vput(vp); 1952 if ((error = vn_start_write(NULL, &mp, 1953 V_XSLEEP | PCATCH)) != 0) { 1954 goto fdout; 1955 } 1956 goto restart; 1957 } 1958 #ifdef MAC 1959 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1960 &nd.ni_cnd); 1961 if (error != 0) 1962 goto out; 1963 #endif 1964 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1965 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1966 #ifdef MAC 1967 out: 1968 #endif 1969 vn_finished_write(mp); 1970 } 1971 NDFREE(&nd, NDF_ONLY_PNBUF); 1972 vput(nd.ni_dvp); 1973 if (vp == nd.ni_dvp) 1974 vrele(vp); 1975 else 1976 vput(vp); 1977 if (error == ERELOOKUP) 1978 goto restart; 1979 fdout: 1980 if (fp != NULL) 1981 fdrop(fp, td); 1982 return (error); 1983 } 1984 1985 /* 1986 * Reposition read/write file offset. 1987 */ 1988 #ifndef _SYS_SYSPROTO_H_ 1989 struct lseek_args { 1990 int fd; 1991 int pad; 1992 off_t offset; 1993 int whence; 1994 }; 1995 #endif 1996 int 1997 sys_lseek(struct thread *td, struct lseek_args *uap) 1998 { 1999 2000 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2001 } 2002 2003 int 2004 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 2005 { 2006 struct file *fp; 2007 int error; 2008 2009 AUDIT_ARG_FD(fd); 2010 error = fget(td, fd, &cap_seek_rights, &fp); 2011 if (error != 0) 2012 return (error); 2013 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 2014 fo_seek(fp, offset, whence, td) : ESPIPE; 2015 fdrop(fp, td); 2016 return (error); 2017 } 2018 2019 #if defined(COMPAT_43) 2020 /* 2021 * Reposition read/write file offset. 2022 */ 2023 #ifndef _SYS_SYSPROTO_H_ 2024 struct olseek_args { 2025 int fd; 2026 long offset; 2027 int whence; 2028 }; 2029 #endif 2030 int 2031 olseek(struct thread *td, struct olseek_args *uap) 2032 { 2033 2034 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2035 } 2036 #endif /* COMPAT_43 */ 2037 2038 #if defined(COMPAT_FREEBSD6) 2039 /* Version with the 'pad' argument */ 2040 int 2041 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 2042 { 2043 2044 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2045 } 2046 #endif 2047 2048 /* 2049 * Check access permissions using passed credentials. 2050 */ 2051 static int 2052 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 2053 struct thread *td) 2054 { 2055 accmode_t accmode; 2056 int error; 2057 2058 /* Flags == 0 means only check for existence. */ 2059 if (user_flags == 0) 2060 return (0); 2061 2062 accmode = 0; 2063 if (user_flags & R_OK) 2064 accmode |= VREAD; 2065 if (user_flags & W_OK) 2066 accmode |= VWRITE; 2067 if (user_flags & X_OK) 2068 accmode |= VEXEC; 2069 #ifdef MAC 2070 error = mac_vnode_check_access(cred, vp, accmode); 2071 if (error != 0) 2072 return (error); 2073 #endif 2074 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 2075 error = VOP_ACCESS(vp, accmode, cred, td); 2076 return (error); 2077 } 2078 2079 /* 2080 * Check access permissions using "real" credentials. 2081 */ 2082 #ifndef _SYS_SYSPROTO_H_ 2083 struct access_args { 2084 char *path; 2085 int amode; 2086 }; 2087 #endif 2088 int 2089 sys_access(struct thread *td, struct access_args *uap) 2090 { 2091 2092 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2093 0, uap->amode)); 2094 } 2095 2096 #ifndef _SYS_SYSPROTO_H_ 2097 struct faccessat_args { 2098 int dirfd; 2099 char *path; 2100 int amode; 2101 int flag; 2102 } 2103 #endif 2104 int 2105 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2106 { 2107 2108 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2109 uap->amode)); 2110 } 2111 2112 int 2113 kern_accessat(struct thread *td, int fd, const char *path, 2114 enum uio_seg pathseg, int flag, int amode) 2115 { 2116 struct ucred *cred, *usecred; 2117 struct vnode *vp; 2118 struct nameidata nd; 2119 int error; 2120 2121 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH)) != 0) 2122 return (EINVAL); 2123 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2124 return (EINVAL); 2125 2126 /* 2127 * Create and modify a temporary credential instead of one that 2128 * is potentially shared (if we need one). 2129 */ 2130 cred = td->td_ucred; 2131 if ((flag & AT_EACCESS) == 0 && 2132 ((cred->cr_uid != cred->cr_ruid || 2133 cred->cr_rgid != cred->cr_groups[0]))) { 2134 usecred = crdup(cred); 2135 usecred->cr_uid = cred->cr_ruid; 2136 usecred->cr_groups[0] = cred->cr_rgid; 2137 td->td_ucred = usecred; 2138 } else 2139 usecred = cred; 2140 AUDIT_ARG_VALUE(amode); 2141 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2142 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | 2143 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights, td); 2144 if ((error = namei(&nd)) != 0) 2145 goto out; 2146 vp = nd.ni_vp; 2147 2148 error = vn_access(vp, amode, usecred, td); 2149 NDFREE_NOTHING(&nd); 2150 vput(vp); 2151 out: 2152 if (usecred != cred) { 2153 td->td_ucred = cred; 2154 crfree(usecred); 2155 } 2156 return (error); 2157 } 2158 2159 /* 2160 * Check access permissions using "effective" credentials. 2161 */ 2162 #ifndef _SYS_SYSPROTO_H_ 2163 struct eaccess_args { 2164 char *path; 2165 int amode; 2166 }; 2167 #endif 2168 int 2169 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2170 { 2171 2172 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2173 AT_EACCESS, uap->amode)); 2174 } 2175 2176 #if defined(COMPAT_43) 2177 /* 2178 * Get file status; this version follows links. 2179 */ 2180 #ifndef _SYS_SYSPROTO_H_ 2181 struct ostat_args { 2182 char *path; 2183 struct ostat *ub; 2184 }; 2185 #endif 2186 int 2187 ostat(struct thread *td, struct ostat_args *uap) 2188 { 2189 struct stat sb; 2190 struct ostat osb; 2191 int error; 2192 2193 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2194 &sb, NULL); 2195 if (error != 0) 2196 return (error); 2197 cvtstat(&sb, &osb); 2198 return (copyout(&osb, uap->ub, sizeof (osb))); 2199 } 2200 2201 /* 2202 * Get file status; this version does not follow links. 2203 */ 2204 #ifndef _SYS_SYSPROTO_H_ 2205 struct olstat_args { 2206 char *path; 2207 struct ostat *ub; 2208 }; 2209 #endif 2210 int 2211 olstat(struct thread *td, struct olstat_args *uap) 2212 { 2213 struct stat sb; 2214 struct ostat osb; 2215 int error; 2216 2217 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2218 UIO_USERSPACE, &sb, NULL); 2219 if (error != 0) 2220 return (error); 2221 cvtstat(&sb, &osb); 2222 return (copyout(&osb, uap->ub, sizeof (osb))); 2223 } 2224 2225 /* 2226 * Convert from an old to a new stat structure. 2227 * XXX: many values are blindly truncated. 2228 */ 2229 void 2230 cvtstat(struct stat *st, struct ostat *ost) 2231 { 2232 2233 bzero(ost, sizeof(*ost)); 2234 ost->st_dev = st->st_dev; 2235 ost->st_ino = st->st_ino; 2236 ost->st_mode = st->st_mode; 2237 ost->st_nlink = st->st_nlink; 2238 ost->st_uid = st->st_uid; 2239 ost->st_gid = st->st_gid; 2240 ost->st_rdev = st->st_rdev; 2241 ost->st_size = MIN(st->st_size, INT32_MAX); 2242 ost->st_atim = st->st_atim; 2243 ost->st_mtim = st->st_mtim; 2244 ost->st_ctim = st->st_ctim; 2245 ost->st_blksize = st->st_blksize; 2246 ost->st_blocks = st->st_blocks; 2247 ost->st_flags = st->st_flags; 2248 ost->st_gen = st->st_gen; 2249 } 2250 #endif /* COMPAT_43 */ 2251 2252 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2253 int ino64_trunc_error; 2254 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2255 &ino64_trunc_error, 0, 2256 "Error on truncation of device, file or inode number, or link count"); 2257 2258 int 2259 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2260 { 2261 2262 ost->st_dev = st->st_dev; 2263 if (ost->st_dev != st->st_dev) { 2264 switch (ino64_trunc_error) { 2265 default: 2266 /* 2267 * Since dev_t is almost raw, don't clamp to the 2268 * maximum for case 2, but ignore the error. 2269 */ 2270 break; 2271 case 1: 2272 return (EOVERFLOW); 2273 } 2274 } 2275 ost->st_ino = st->st_ino; 2276 if (ost->st_ino != st->st_ino) { 2277 switch (ino64_trunc_error) { 2278 default: 2279 case 0: 2280 break; 2281 case 1: 2282 return (EOVERFLOW); 2283 case 2: 2284 ost->st_ino = UINT32_MAX; 2285 break; 2286 } 2287 } 2288 ost->st_mode = st->st_mode; 2289 ost->st_nlink = st->st_nlink; 2290 if (ost->st_nlink != st->st_nlink) { 2291 switch (ino64_trunc_error) { 2292 default: 2293 case 0: 2294 break; 2295 case 1: 2296 return (EOVERFLOW); 2297 case 2: 2298 ost->st_nlink = UINT16_MAX; 2299 break; 2300 } 2301 } 2302 ost->st_uid = st->st_uid; 2303 ost->st_gid = st->st_gid; 2304 ost->st_rdev = st->st_rdev; 2305 if (ost->st_rdev != st->st_rdev) { 2306 switch (ino64_trunc_error) { 2307 default: 2308 break; 2309 case 1: 2310 return (EOVERFLOW); 2311 } 2312 } 2313 ost->st_atim = st->st_atim; 2314 ost->st_mtim = st->st_mtim; 2315 ost->st_ctim = st->st_ctim; 2316 ost->st_size = st->st_size; 2317 ost->st_blocks = st->st_blocks; 2318 ost->st_blksize = st->st_blksize; 2319 ost->st_flags = st->st_flags; 2320 ost->st_gen = st->st_gen; 2321 ost->st_lspare = 0; 2322 ost->st_birthtim = st->st_birthtim; 2323 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2324 sizeof(*ost) - offsetof(struct freebsd11_stat, 2325 st_birthtim) - sizeof(ost->st_birthtim)); 2326 return (0); 2327 } 2328 2329 int 2330 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2331 { 2332 struct stat sb; 2333 struct freebsd11_stat osb; 2334 int error; 2335 2336 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2337 &sb, NULL); 2338 if (error != 0) 2339 return (error); 2340 error = freebsd11_cvtstat(&sb, &osb); 2341 if (error == 0) 2342 error = copyout(&osb, uap->ub, sizeof(osb)); 2343 return (error); 2344 } 2345 2346 int 2347 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2348 { 2349 struct stat sb; 2350 struct freebsd11_stat osb; 2351 int error; 2352 2353 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2354 UIO_USERSPACE, &sb, NULL); 2355 if (error != 0) 2356 return (error); 2357 error = freebsd11_cvtstat(&sb, &osb); 2358 if (error == 0) 2359 error = copyout(&osb, uap->ub, sizeof(osb)); 2360 return (error); 2361 } 2362 2363 int 2364 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2365 { 2366 struct fhandle fh; 2367 struct stat sb; 2368 struct freebsd11_stat osb; 2369 int error; 2370 2371 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2372 if (error != 0) 2373 return (error); 2374 error = kern_fhstat(td, fh, &sb); 2375 if (error != 0) 2376 return (error); 2377 error = freebsd11_cvtstat(&sb, &osb); 2378 if (error == 0) 2379 error = copyout(&osb, uap->sb, sizeof(osb)); 2380 return (error); 2381 } 2382 2383 int 2384 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2385 { 2386 struct stat sb; 2387 struct freebsd11_stat osb; 2388 int error; 2389 2390 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2391 UIO_USERSPACE, &sb, NULL); 2392 if (error != 0) 2393 return (error); 2394 error = freebsd11_cvtstat(&sb, &osb); 2395 if (error == 0) 2396 error = copyout(&osb, uap->buf, sizeof(osb)); 2397 return (error); 2398 } 2399 #endif /* COMPAT_FREEBSD11 */ 2400 2401 /* 2402 * Get file status 2403 */ 2404 #ifndef _SYS_SYSPROTO_H_ 2405 struct fstatat_args { 2406 int fd; 2407 char *path; 2408 struct stat *buf; 2409 int flag; 2410 } 2411 #endif 2412 int 2413 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2414 { 2415 struct stat sb; 2416 int error; 2417 2418 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2419 UIO_USERSPACE, &sb, NULL); 2420 if (error == 0) 2421 error = copyout(&sb, uap->buf, sizeof (sb)); 2422 return (error); 2423 } 2424 2425 int 2426 kern_statat(struct thread *td, int flag, int fd, const char *path, 2427 enum uio_seg pathseg, struct stat *sbp, 2428 void (*hook)(struct vnode *vp, struct stat *sbp)) 2429 { 2430 struct nameidata nd; 2431 int error; 2432 2433 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2434 AT_EMPTY_PATH)) != 0) 2435 return (EINVAL); 2436 2437 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH | 2438 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF | 2439 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, td); 2440 2441 if ((error = namei(&nd)) != 0) { 2442 if (error == ENOTDIR && 2443 (nd.ni_resflags & NIRES_EMPTYPATH) != 0) 2444 error = kern_fstat(td, fd, sbp); 2445 return (error); 2446 } 2447 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED, td); 2448 if (error == 0) { 2449 if (__predict_false(hook != NULL)) 2450 hook(nd.ni_vp, sbp); 2451 } 2452 NDFREE_NOTHING(&nd); 2453 vput(nd.ni_vp); 2454 #ifdef __STAT_TIME_T_EXT 2455 sbp->st_atim_ext = 0; 2456 sbp->st_mtim_ext = 0; 2457 sbp->st_ctim_ext = 0; 2458 sbp->st_btim_ext = 0; 2459 #endif 2460 #ifdef KTRACE 2461 if (KTRPOINT(td, KTR_STRUCT)) 2462 ktrstat_error(sbp, error); 2463 #endif 2464 return (error); 2465 } 2466 2467 #if defined(COMPAT_FREEBSD11) 2468 /* 2469 * Implementation of the NetBSD [l]stat() functions. 2470 */ 2471 void 2472 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2473 { 2474 2475 bzero(nsb, sizeof(*nsb)); 2476 nsb->st_dev = sb->st_dev; 2477 nsb->st_ino = sb->st_ino; 2478 nsb->st_mode = sb->st_mode; 2479 nsb->st_nlink = sb->st_nlink; 2480 nsb->st_uid = sb->st_uid; 2481 nsb->st_gid = sb->st_gid; 2482 nsb->st_rdev = sb->st_rdev; 2483 nsb->st_atim = sb->st_atim; 2484 nsb->st_mtim = sb->st_mtim; 2485 nsb->st_ctim = sb->st_ctim; 2486 nsb->st_size = sb->st_size; 2487 nsb->st_blocks = sb->st_blocks; 2488 nsb->st_blksize = sb->st_blksize; 2489 nsb->st_flags = sb->st_flags; 2490 nsb->st_gen = sb->st_gen; 2491 nsb->st_birthtim = sb->st_birthtim; 2492 } 2493 2494 #ifndef _SYS_SYSPROTO_H_ 2495 struct freebsd11_nstat_args { 2496 char *path; 2497 struct nstat *ub; 2498 }; 2499 #endif 2500 int 2501 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2502 { 2503 struct stat sb; 2504 struct nstat nsb; 2505 int error; 2506 2507 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2508 &sb, NULL); 2509 if (error != 0) 2510 return (error); 2511 freebsd11_cvtnstat(&sb, &nsb); 2512 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2513 } 2514 2515 /* 2516 * NetBSD lstat. Get file status; this version does not follow links. 2517 */ 2518 #ifndef _SYS_SYSPROTO_H_ 2519 struct freebsd11_nlstat_args { 2520 char *path; 2521 struct nstat *ub; 2522 }; 2523 #endif 2524 int 2525 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2526 { 2527 struct stat sb; 2528 struct nstat nsb; 2529 int error; 2530 2531 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2532 UIO_USERSPACE, &sb, NULL); 2533 if (error != 0) 2534 return (error); 2535 freebsd11_cvtnstat(&sb, &nsb); 2536 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2537 } 2538 #endif /* COMPAT_FREEBSD11 */ 2539 2540 /* 2541 * Get configurable pathname variables. 2542 */ 2543 #ifndef _SYS_SYSPROTO_H_ 2544 struct pathconf_args { 2545 char *path; 2546 int name; 2547 }; 2548 #endif 2549 int 2550 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2551 { 2552 long value; 2553 int error; 2554 2555 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2556 &value); 2557 if (error == 0) 2558 td->td_retval[0] = value; 2559 return (error); 2560 } 2561 2562 #ifndef _SYS_SYSPROTO_H_ 2563 struct lpathconf_args { 2564 char *path; 2565 int name; 2566 }; 2567 #endif 2568 int 2569 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2570 { 2571 long value; 2572 int error; 2573 2574 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2575 NOFOLLOW, &value); 2576 if (error == 0) 2577 td->td_retval[0] = value; 2578 return (error); 2579 } 2580 2581 int 2582 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2583 int name, u_long flags, long *valuep) 2584 { 2585 struct nameidata nd; 2586 int error; 2587 2588 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2589 pathseg, path, td); 2590 if ((error = namei(&nd)) != 0) 2591 return (error); 2592 NDFREE_NOTHING(&nd); 2593 2594 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2595 vput(nd.ni_vp); 2596 return (error); 2597 } 2598 2599 /* 2600 * Return target name of a symbolic link. 2601 */ 2602 #ifndef _SYS_SYSPROTO_H_ 2603 struct readlink_args { 2604 char *path; 2605 char *buf; 2606 size_t count; 2607 }; 2608 #endif 2609 int 2610 sys_readlink(struct thread *td, struct readlink_args *uap) 2611 { 2612 2613 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2614 uap->buf, UIO_USERSPACE, uap->count)); 2615 } 2616 #ifndef _SYS_SYSPROTO_H_ 2617 struct readlinkat_args { 2618 int fd; 2619 char *path; 2620 char *buf; 2621 size_t bufsize; 2622 }; 2623 #endif 2624 int 2625 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2626 { 2627 2628 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2629 uap->buf, UIO_USERSPACE, uap->bufsize)); 2630 } 2631 2632 int 2633 kern_readlinkat(struct thread *td, int fd, const char *path, 2634 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2635 { 2636 struct vnode *vp; 2637 struct nameidata nd; 2638 int error; 2639 2640 if (count > IOSIZE_MAX) 2641 return (EINVAL); 2642 2643 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2644 pathseg, path, fd, td); 2645 2646 if ((error = namei(&nd)) != 0) 2647 return (error); 2648 NDFREE_NOTHING(&nd); 2649 vp = nd.ni_vp; 2650 2651 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2652 vput(vp); 2653 2654 return (error); 2655 } 2656 2657 /* 2658 * Helper function to readlink from a vnode 2659 */ 2660 static int 2661 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2662 struct thread *td) 2663 { 2664 struct iovec aiov; 2665 struct uio auio; 2666 int error; 2667 2668 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2669 #ifdef MAC 2670 error = mac_vnode_check_readlink(td->td_ucred, vp); 2671 if (error != 0) 2672 return (error); 2673 #endif 2674 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2675 return (EINVAL); 2676 2677 aiov.iov_base = buf; 2678 aiov.iov_len = count; 2679 auio.uio_iov = &aiov; 2680 auio.uio_iovcnt = 1; 2681 auio.uio_offset = 0; 2682 auio.uio_rw = UIO_READ; 2683 auio.uio_segflg = bufseg; 2684 auio.uio_td = td; 2685 auio.uio_resid = count; 2686 error = VOP_READLINK(vp, &auio, td->td_ucred); 2687 td->td_retval[0] = count - auio.uio_resid; 2688 return (error); 2689 } 2690 2691 /* 2692 * Common implementation code for chflags() and fchflags(). 2693 */ 2694 static int 2695 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2696 { 2697 struct mount *mp; 2698 struct vattr vattr; 2699 int error; 2700 2701 /* We can't support the value matching VNOVAL. */ 2702 if (flags == VNOVAL) 2703 return (EOPNOTSUPP); 2704 2705 /* 2706 * Prevent non-root users from setting flags on devices. When 2707 * a device is reused, users can retain ownership of the device 2708 * if they are allowed to set flags and programs assume that 2709 * chown can't fail when done as root. 2710 */ 2711 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2712 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2713 if (error != 0) 2714 return (error); 2715 } 2716 2717 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2718 return (error); 2719 VATTR_NULL(&vattr); 2720 vattr.va_flags = flags; 2721 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2722 #ifdef MAC 2723 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2724 if (error == 0) 2725 #endif 2726 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2727 VOP_UNLOCK(vp); 2728 vn_finished_write(mp); 2729 return (error); 2730 } 2731 2732 /* 2733 * Change flags of a file given a path name. 2734 */ 2735 #ifndef _SYS_SYSPROTO_H_ 2736 struct chflags_args { 2737 const char *path; 2738 u_long flags; 2739 }; 2740 #endif 2741 int 2742 sys_chflags(struct thread *td, struct chflags_args *uap) 2743 { 2744 2745 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2746 uap->flags, 0)); 2747 } 2748 2749 #ifndef _SYS_SYSPROTO_H_ 2750 struct chflagsat_args { 2751 int fd; 2752 const char *path; 2753 u_long flags; 2754 int atflag; 2755 } 2756 #endif 2757 int 2758 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2759 { 2760 2761 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2762 AT_EMPTY_PATH)) != 0) 2763 return (EINVAL); 2764 2765 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2766 uap->flags, uap->atflag)); 2767 } 2768 2769 /* 2770 * Same as chflags() but doesn't follow symlinks. 2771 */ 2772 #ifndef _SYS_SYSPROTO_H_ 2773 struct lchflags_args { 2774 const char *path; 2775 u_long flags; 2776 }; 2777 #endif 2778 int 2779 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2780 { 2781 2782 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2783 uap->flags, AT_SYMLINK_NOFOLLOW)); 2784 } 2785 2786 static int 2787 kern_chflagsat(struct thread *td, int fd, const char *path, 2788 enum uio_seg pathseg, u_long flags, int atflag) 2789 { 2790 struct nameidata nd; 2791 int error; 2792 2793 AUDIT_ARG_FFLAGS(flags); 2794 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW | 2795 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2796 fd, &cap_fchflags_rights, td); 2797 if ((error = namei(&nd)) != 0) 2798 return (error); 2799 NDFREE_NOTHING(&nd); 2800 error = setfflags(td, nd.ni_vp, flags); 2801 vrele(nd.ni_vp); 2802 return (error); 2803 } 2804 2805 /* 2806 * Change flags of a file given a file descriptor. 2807 */ 2808 #ifndef _SYS_SYSPROTO_H_ 2809 struct fchflags_args { 2810 int fd; 2811 u_long flags; 2812 }; 2813 #endif 2814 int 2815 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2816 { 2817 struct file *fp; 2818 int error; 2819 2820 AUDIT_ARG_FD(uap->fd); 2821 AUDIT_ARG_FFLAGS(uap->flags); 2822 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2823 &fp); 2824 if (error != 0) 2825 return (error); 2826 #ifdef AUDIT 2827 if (AUDITING_TD(td)) { 2828 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2829 AUDIT_ARG_VNODE1(fp->f_vnode); 2830 VOP_UNLOCK(fp->f_vnode); 2831 } 2832 #endif 2833 error = setfflags(td, fp->f_vnode, uap->flags); 2834 fdrop(fp, td); 2835 return (error); 2836 } 2837 2838 /* 2839 * Common implementation code for chmod(), lchmod() and fchmod(). 2840 */ 2841 int 2842 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2843 { 2844 struct mount *mp; 2845 struct vattr vattr; 2846 int error; 2847 2848 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2849 return (error); 2850 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2851 VATTR_NULL(&vattr); 2852 vattr.va_mode = mode & ALLPERMS; 2853 #ifdef MAC 2854 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2855 if (error == 0) 2856 #endif 2857 error = VOP_SETATTR(vp, &vattr, cred); 2858 VOP_UNLOCK(vp); 2859 vn_finished_write(mp); 2860 return (error); 2861 } 2862 2863 /* 2864 * Change mode of a file given path name. 2865 */ 2866 #ifndef _SYS_SYSPROTO_H_ 2867 struct chmod_args { 2868 char *path; 2869 int mode; 2870 }; 2871 #endif 2872 int 2873 sys_chmod(struct thread *td, struct chmod_args *uap) 2874 { 2875 2876 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2877 uap->mode, 0)); 2878 } 2879 2880 #ifndef _SYS_SYSPROTO_H_ 2881 struct fchmodat_args { 2882 int dirfd; 2883 char *path; 2884 mode_t mode; 2885 int flag; 2886 } 2887 #endif 2888 int 2889 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2890 { 2891 2892 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2893 AT_EMPTY_PATH)) != 0) 2894 return (EINVAL); 2895 2896 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2897 uap->mode, uap->flag)); 2898 } 2899 2900 /* 2901 * Change mode of a file given path name (don't follow links.) 2902 */ 2903 #ifndef _SYS_SYSPROTO_H_ 2904 struct lchmod_args { 2905 char *path; 2906 int mode; 2907 }; 2908 #endif 2909 int 2910 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2911 { 2912 2913 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2914 uap->mode, AT_SYMLINK_NOFOLLOW)); 2915 } 2916 2917 int 2918 kern_fchmodat(struct thread *td, int fd, const char *path, 2919 enum uio_seg pathseg, mode_t mode, int flag) 2920 { 2921 struct nameidata nd; 2922 int error; 2923 2924 AUDIT_ARG_MODE(mode); 2925 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 2926 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2927 fd, &cap_fchmod_rights, td); 2928 if ((error = namei(&nd)) != 0) 2929 return (error); 2930 NDFREE_NOTHING(&nd); 2931 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2932 vrele(nd.ni_vp); 2933 return (error); 2934 } 2935 2936 /* 2937 * Change mode of a file given a file descriptor. 2938 */ 2939 #ifndef _SYS_SYSPROTO_H_ 2940 struct fchmod_args { 2941 int fd; 2942 int mode; 2943 }; 2944 #endif 2945 int 2946 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2947 { 2948 struct file *fp; 2949 int error; 2950 2951 AUDIT_ARG_FD(uap->fd); 2952 AUDIT_ARG_MODE(uap->mode); 2953 2954 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2955 if (error != 0) 2956 return (error); 2957 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2958 fdrop(fp, td); 2959 return (error); 2960 } 2961 2962 /* 2963 * Common implementation for chown(), lchown(), and fchown() 2964 */ 2965 int 2966 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2967 gid_t gid) 2968 { 2969 struct mount *mp; 2970 struct vattr vattr; 2971 int error; 2972 2973 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2974 return (error); 2975 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2976 VATTR_NULL(&vattr); 2977 vattr.va_uid = uid; 2978 vattr.va_gid = gid; 2979 #ifdef MAC 2980 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2981 vattr.va_gid); 2982 if (error == 0) 2983 #endif 2984 error = VOP_SETATTR(vp, &vattr, cred); 2985 VOP_UNLOCK(vp); 2986 vn_finished_write(mp); 2987 return (error); 2988 } 2989 2990 /* 2991 * Set ownership given a path name. 2992 */ 2993 #ifndef _SYS_SYSPROTO_H_ 2994 struct chown_args { 2995 char *path; 2996 int uid; 2997 int gid; 2998 }; 2999 #endif 3000 int 3001 sys_chown(struct thread *td, struct chown_args *uap) 3002 { 3003 3004 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 3005 uap->gid, 0)); 3006 } 3007 3008 #ifndef _SYS_SYSPROTO_H_ 3009 struct fchownat_args { 3010 int fd; 3011 const char * path; 3012 uid_t uid; 3013 gid_t gid; 3014 int flag; 3015 }; 3016 #endif 3017 int 3018 sys_fchownat(struct thread *td, struct fchownat_args *uap) 3019 { 3020 3021 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3022 AT_EMPTY_PATH)) != 0) 3023 return (EINVAL); 3024 3025 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 3026 uap->gid, uap->flag)); 3027 } 3028 3029 int 3030 kern_fchownat(struct thread *td, int fd, const char *path, 3031 enum uio_seg pathseg, int uid, int gid, int flag) 3032 { 3033 struct nameidata nd; 3034 int error; 3035 3036 AUDIT_ARG_OWNER(uid, gid); 3037 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3038 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3039 fd, &cap_fchown_rights, td); 3040 3041 if ((error = namei(&nd)) != 0) 3042 return (error); 3043 NDFREE_NOTHING(&nd); 3044 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 3045 vrele(nd.ni_vp); 3046 return (error); 3047 } 3048 3049 /* 3050 * Set ownership given a path name, do not cross symlinks. 3051 */ 3052 #ifndef _SYS_SYSPROTO_H_ 3053 struct lchown_args { 3054 char *path; 3055 int uid; 3056 int gid; 3057 }; 3058 #endif 3059 int 3060 sys_lchown(struct thread *td, struct lchown_args *uap) 3061 { 3062 3063 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3064 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 3065 } 3066 3067 /* 3068 * Set ownership given a file descriptor. 3069 */ 3070 #ifndef _SYS_SYSPROTO_H_ 3071 struct fchown_args { 3072 int fd; 3073 int uid; 3074 int gid; 3075 }; 3076 #endif 3077 int 3078 sys_fchown(struct thread *td, struct fchown_args *uap) 3079 { 3080 struct file *fp; 3081 int error; 3082 3083 AUDIT_ARG_FD(uap->fd); 3084 AUDIT_ARG_OWNER(uap->uid, uap->gid); 3085 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 3086 if (error != 0) 3087 return (error); 3088 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 3089 fdrop(fp, td); 3090 return (error); 3091 } 3092 3093 /* 3094 * Common implementation code for utimes(), lutimes(), and futimes(). 3095 */ 3096 static int 3097 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 3098 struct timespec *tsp) 3099 { 3100 struct timeval tv[2]; 3101 const struct timeval *tvp; 3102 int error; 3103 3104 if (usrtvp == NULL) { 3105 vfs_timestamp(&tsp[0]); 3106 tsp[1] = tsp[0]; 3107 } else { 3108 if (tvpseg == UIO_SYSSPACE) { 3109 tvp = usrtvp; 3110 } else { 3111 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3112 return (error); 3113 tvp = tv; 3114 } 3115 3116 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3117 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3118 return (EINVAL); 3119 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3120 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3121 } 3122 return (0); 3123 } 3124 3125 /* 3126 * Common implementation code for futimens(), utimensat(). 3127 */ 3128 #define UTIMENS_NULL 0x1 3129 #define UTIMENS_EXIT 0x2 3130 static int 3131 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3132 struct timespec *tsp, int *retflags) 3133 { 3134 struct timespec tsnow; 3135 int error; 3136 3137 vfs_timestamp(&tsnow); 3138 *retflags = 0; 3139 if (usrtsp == NULL) { 3140 tsp[0] = tsnow; 3141 tsp[1] = tsnow; 3142 *retflags |= UTIMENS_NULL; 3143 return (0); 3144 } 3145 if (tspseg == UIO_SYSSPACE) { 3146 tsp[0] = usrtsp[0]; 3147 tsp[1] = usrtsp[1]; 3148 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3149 return (error); 3150 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3151 *retflags |= UTIMENS_EXIT; 3152 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3153 *retflags |= UTIMENS_NULL; 3154 if (tsp[0].tv_nsec == UTIME_OMIT) 3155 tsp[0].tv_sec = VNOVAL; 3156 else if (tsp[0].tv_nsec == UTIME_NOW) 3157 tsp[0] = tsnow; 3158 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3159 return (EINVAL); 3160 if (tsp[1].tv_nsec == UTIME_OMIT) 3161 tsp[1].tv_sec = VNOVAL; 3162 else if (tsp[1].tv_nsec == UTIME_NOW) 3163 tsp[1] = tsnow; 3164 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3165 return (EINVAL); 3166 3167 return (0); 3168 } 3169 3170 /* 3171 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3172 * and utimensat(). 3173 */ 3174 static int 3175 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3176 int numtimes, int nullflag) 3177 { 3178 struct mount *mp; 3179 struct vattr vattr; 3180 int error; 3181 bool setbirthtime; 3182 3183 setbirthtime = false; 3184 vattr.va_birthtime.tv_sec = VNOVAL; 3185 vattr.va_birthtime.tv_nsec = 0; 3186 3187 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3188 return (error); 3189 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3190 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred) == 0 && 3191 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3192 setbirthtime = true; 3193 VATTR_NULL(&vattr); 3194 vattr.va_atime = ts[0]; 3195 vattr.va_mtime = ts[1]; 3196 if (setbirthtime) 3197 vattr.va_birthtime = ts[1]; 3198 if (numtimes > 2) 3199 vattr.va_birthtime = ts[2]; 3200 if (nullflag) 3201 vattr.va_vaflags |= VA_UTIMES_NULL; 3202 #ifdef MAC 3203 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3204 vattr.va_mtime); 3205 #endif 3206 if (error == 0) 3207 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3208 VOP_UNLOCK(vp); 3209 vn_finished_write(mp); 3210 return (error); 3211 } 3212 3213 /* 3214 * Set the access and modification times of a file. 3215 */ 3216 #ifndef _SYS_SYSPROTO_H_ 3217 struct utimes_args { 3218 char *path; 3219 struct timeval *tptr; 3220 }; 3221 #endif 3222 int 3223 sys_utimes(struct thread *td, struct utimes_args *uap) 3224 { 3225 3226 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3227 uap->tptr, UIO_USERSPACE)); 3228 } 3229 3230 #ifndef _SYS_SYSPROTO_H_ 3231 struct futimesat_args { 3232 int fd; 3233 const char * path; 3234 const struct timeval * times; 3235 }; 3236 #endif 3237 int 3238 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3239 { 3240 3241 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3242 uap->times, UIO_USERSPACE)); 3243 } 3244 3245 int 3246 kern_utimesat(struct thread *td, int fd, const char *path, 3247 enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) 3248 { 3249 struct nameidata nd; 3250 struct timespec ts[2]; 3251 int error; 3252 3253 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3254 return (error); 3255 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3256 &cap_futimes_rights, td); 3257 3258 if ((error = namei(&nd)) != 0) 3259 return (error); 3260 NDFREE_NOTHING(&nd); 3261 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3262 vrele(nd.ni_vp); 3263 return (error); 3264 } 3265 3266 /* 3267 * Set the access and modification times of a file. 3268 */ 3269 #ifndef _SYS_SYSPROTO_H_ 3270 struct lutimes_args { 3271 char *path; 3272 struct timeval *tptr; 3273 }; 3274 #endif 3275 int 3276 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3277 { 3278 3279 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3280 UIO_USERSPACE)); 3281 } 3282 3283 int 3284 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3285 struct timeval *tptr, enum uio_seg tptrseg) 3286 { 3287 struct timespec ts[2]; 3288 struct nameidata nd; 3289 int error; 3290 3291 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3292 return (error); 3293 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3294 if ((error = namei(&nd)) != 0) 3295 return (error); 3296 NDFREE_NOTHING(&nd); 3297 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3298 vrele(nd.ni_vp); 3299 return (error); 3300 } 3301 3302 /* 3303 * Set the access and modification times of a file. 3304 */ 3305 #ifndef _SYS_SYSPROTO_H_ 3306 struct futimes_args { 3307 int fd; 3308 struct timeval *tptr; 3309 }; 3310 #endif 3311 int 3312 sys_futimes(struct thread *td, struct futimes_args *uap) 3313 { 3314 3315 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3316 } 3317 3318 int 3319 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3320 enum uio_seg tptrseg) 3321 { 3322 struct timespec ts[2]; 3323 struct file *fp; 3324 int error; 3325 3326 AUDIT_ARG_FD(fd); 3327 error = getutimes(tptr, tptrseg, ts); 3328 if (error != 0) 3329 return (error); 3330 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3331 if (error != 0) 3332 return (error); 3333 #ifdef AUDIT 3334 if (AUDITING_TD(td)) { 3335 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3336 AUDIT_ARG_VNODE1(fp->f_vnode); 3337 VOP_UNLOCK(fp->f_vnode); 3338 } 3339 #endif 3340 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3341 fdrop(fp, td); 3342 return (error); 3343 } 3344 3345 int 3346 sys_futimens(struct thread *td, struct futimens_args *uap) 3347 { 3348 3349 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3350 } 3351 3352 int 3353 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3354 enum uio_seg tptrseg) 3355 { 3356 struct timespec ts[2]; 3357 struct file *fp; 3358 int error, flags; 3359 3360 AUDIT_ARG_FD(fd); 3361 error = getutimens(tptr, tptrseg, ts, &flags); 3362 if (error != 0) 3363 return (error); 3364 if (flags & UTIMENS_EXIT) 3365 return (0); 3366 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3367 if (error != 0) 3368 return (error); 3369 #ifdef AUDIT 3370 if (AUDITING_TD(td)) { 3371 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3372 AUDIT_ARG_VNODE1(fp->f_vnode); 3373 VOP_UNLOCK(fp->f_vnode); 3374 } 3375 #endif 3376 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3377 fdrop(fp, td); 3378 return (error); 3379 } 3380 3381 int 3382 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3383 { 3384 3385 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3386 uap->times, UIO_USERSPACE, uap->flag)); 3387 } 3388 3389 int 3390 kern_utimensat(struct thread *td, int fd, const char *path, 3391 enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg, 3392 int flag) 3393 { 3394 struct nameidata nd; 3395 struct timespec ts[2]; 3396 int error, flags; 3397 3398 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3399 AT_EMPTY_PATH)) != 0) 3400 return (EINVAL); 3401 3402 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3403 return (error); 3404 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3405 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, 3406 pathseg, path, fd, &cap_futimes_rights, td); 3407 if ((error = namei(&nd)) != 0) 3408 return (error); 3409 /* 3410 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3411 * POSIX states: 3412 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3413 * "Search permission is denied by a component of the path prefix." 3414 */ 3415 NDFREE_NOTHING(&nd); 3416 if ((flags & UTIMENS_EXIT) == 0) 3417 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3418 vrele(nd.ni_vp); 3419 return (error); 3420 } 3421 3422 /* 3423 * Truncate a file given its path name. 3424 */ 3425 #ifndef _SYS_SYSPROTO_H_ 3426 struct truncate_args { 3427 char *path; 3428 int pad; 3429 off_t length; 3430 }; 3431 #endif 3432 int 3433 sys_truncate(struct thread *td, struct truncate_args *uap) 3434 { 3435 3436 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3437 } 3438 3439 int 3440 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3441 off_t length) 3442 { 3443 struct mount *mp; 3444 struct vnode *vp; 3445 void *rl_cookie; 3446 struct vattr vattr; 3447 struct nameidata nd; 3448 int error; 3449 3450 if (length < 0) 3451 return (EINVAL); 3452 NDPREINIT(&nd); 3453 retry: 3454 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3455 if ((error = namei(&nd)) != 0) 3456 return (error); 3457 vp = nd.ni_vp; 3458 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3459 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3460 vn_rangelock_unlock(vp, rl_cookie); 3461 vrele(vp); 3462 return (error); 3463 } 3464 NDFREE(&nd, NDF_ONLY_PNBUF); 3465 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3466 if (vp->v_type == VDIR) 3467 error = EISDIR; 3468 #ifdef MAC 3469 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3470 } 3471 #endif 3472 else if ((error = vn_writechk(vp)) == 0 && 3473 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3474 VATTR_NULL(&vattr); 3475 vattr.va_size = length; 3476 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3477 } 3478 VOP_UNLOCK(vp); 3479 vn_finished_write(mp); 3480 vn_rangelock_unlock(vp, rl_cookie); 3481 vrele(vp); 3482 if (error == ERELOOKUP) 3483 goto retry; 3484 return (error); 3485 } 3486 3487 #if defined(COMPAT_43) 3488 /* 3489 * Truncate a file given its path name. 3490 */ 3491 #ifndef _SYS_SYSPROTO_H_ 3492 struct otruncate_args { 3493 char *path; 3494 long length; 3495 }; 3496 #endif 3497 int 3498 otruncate(struct thread *td, struct otruncate_args *uap) 3499 { 3500 3501 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3502 } 3503 #endif /* COMPAT_43 */ 3504 3505 #if defined(COMPAT_FREEBSD6) 3506 /* Versions with the pad argument */ 3507 int 3508 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3509 { 3510 3511 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3512 } 3513 3514 int 3515 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3516 { 3517 3518 return (kern_ftruncate(td, uap->fd, uap->length)); 3519 } 3520 #endif 3521 3522 int 3523 kern_fsync(struct thread *td, int fd, bool fullsync) 3524 { 3525 struct vnode *vp; 3526 struct mount *mp; 3527 struct file *fp; 3528 int error; 3529 3530 AUDIT_ARG_FD(fd); 3531 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3532 if (error != 0) 3533 return (error); 3534 vp = fp->f_vnode; 3535 #if 0 3536 if (!fullsync) 3537 /* XXXKIB: compete outstanding aio writes */; 3538 #endif 3539 retry: 3540 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3541 if (error != 0) 3542 goto drop; 3543 vn_lock(vp, vn_lktype_write(mp, vp) | LK_RETRY); 3544 AUDIT_ARG_VNODE1(vp); 3545 if (vp->v_object != NULL) { 3546 VM_OBJECT_WLOCK(vp->v_object); 3547 vm_object_page_clean(vp->v_object, 0, 0, 0); 3548 VM_OBJECT_WUNLOCK(vp->v_object); 3549 } 3550 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3551 VOP_UNLOCK(vp); 3552 vn_finished_write(mp); 3553 if (error == ERELOOKUP) 3554 goto retry; 3555 drop: 3556 fdrop(fp, td); 3557 return (error); 3558 } 3559 3560 /* 3561 * Sync an open file. 3562 */ 3563 #ifndef _SYS_SYSPROTO_H_ 3564 struct fsync_args { 3565 int fd; 3566 }; 3567 #endif 3568 int 3569 sys_fsync(struct thread *td, struct fsync_args *uap) 3570 { 3571 3572 return (kern_fsync(td, uap->fd, true)); 3573 } 3574 3575 int 3576 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3577 { 3578 3579 return (kern_fsync(td, uap->fd, false)); 3580 } 3581 3582 /* 3583 * Rename files. Source and destination must either both be directories, or 3584 * both not be directories. If target is a directory, it must be empty. 3585 */ 3586 #ifndef _SYS_SYSPROTO_H_ 3587 struct rename_args { 3588 char *from; 3589 char *to; 3590 }; 3591 #endif 3592 int 3593 sys_rename(struct thread *td, struct rename_args *uap) 3594 { 3595 3596 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3597 uap->to, UIO_USERSPACE)); 3598 } 3599 3600 #ifndef _SYS_SYSPROTO_H_ 3601 struct renameat_args { 3602 int oldfd; 3603 char *old; 3604 int newfd; 3605 char *new; 3606 }; 3607 #endif 3608 int 3609 sys_renameat(struct thread *td, struct renameat_args *uap) 3610 { 3611 3612 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3613 UIO_USERSPACE)); 3614 } 3615 3616 #ifdef MAC 3617 static int 3618 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd, 3619 const char *new, enum uio_seg pathseg, struct nameidata *fromnd) 3620 { 3621 int error; 3622 3623 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3624 AUDITVNODE1, pathseg, old, oldfd, &cap_renameat_source_rights, td); 3625 if ((error = namei(fromnd)) != 0) 3626 return (error); 3627 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp, 3628 fromnd->ni_vp, &fromnd->ni_cnd); 3629 VOP_UNLOCK(fromnd->ni_dvp); 3630 if (fromnd->ni_dvp != fromnd->ni_vp) 3631 VOP_UNLOCK(fromnd->ni_vp); 3632 if (error != 0) { 3633 NDFREE(fromnd, NDF_ONLY_PNBUF); 3634 vrele(fromnd->ni_dvp); 3635 vrele(fromnd->ni_vp); 3636 if (fromnd->ni_startdir) 3637 vrele(fromnd->ni_startdir); 3638 } 3639 return (error); 3640 } 3641 #endif 3642 3643 int 3644 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3645 const char *new, enum uio_seg pathseg) 3646 { 3647 struct mount *mp = NULL; 3648 struct vnode *tvp, *fvp, *tdvp; 3649 struct nameidata fromnd, tond; 3650 u_int64_t tondflags; 3651 int error; 3652 3653 again: 3654 bwillwrite(); 3655 #ifdef MAC 3656 if (mac_vnode_check_rename_from_enabled()) { 3657 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg, 3658 &fromnd); 3659 if (error != 0) 3660 return (error); 3661 } else { 3662 #endif 3663 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3664 pathseg, old, oldfd, &cap_renameat_source_rights, td); 3665 if ((error = namei(&fromnd)) != 0) 3666 return (error); 3667 #ifdef MAC 3668 } 3669 #endif 3670 fvp = fromnd.ni_vp; 3671 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | AUDITVNODE2; 3672 if (fromnd.ni_vp->v_type == VDIR) 3673 tondflags |= WILLBEDIR; 3674 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd, 3675 &cap_renameat_target_rights, td); 3676 if ((error = namei(&tond)) != 0) { 3677 /* Translate error code for rename("dir1", "dir2/."). */ 3678 if (error == EISDIR && fvp->v_type == VDIR) 3679 error = EINVAL; 3680 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3681 vrele(fromnd.ni_dvp); 3682 vrele(fvp); 3683 goto out1; 3684 } 3685 tdvp = tond.ni_dvp; 3686 tvp = tond.ni_vp; 3687 error = vn_start_write(fvp, &mp, V_NOWAIT); 3688 if (error != 0) { 3689 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3690 NDFREE(&tond, NDF_ONLY_PNBUF); 3691 if (tvp != NULL) 3692 vput(tvp); 3693 if (tdvp == tvp) 3694 vrele(tdvp); 3695 else 3696 vput(tdvp); 3697 vrele(fromnd.ni_dvp); 3698 vrele(fvp); 3699 vrele(tond.ni_startdir); 3700 if (fromnd.ni_startdir != NULL) 3701 vrele(fromnd.ni_startdir); 3702 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3703 if (error != 0) 3704 return (error); 3705 goto again; 3706 } 3707 if (tvp != NULL) { 3708 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3709 error = ENOTDIR; 3710 goto out; 3711 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3712 error = EISDIR; 3713 goto out; 3714 } 3715 #ifdef CAPABILITIES 3716 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3717 /* 3718 * If the target already exists we require CAP_UNLINKAT 3719 * from 'newfd', when newfd was used for the lookup. 3720 */ 3721 error = cap_check(&tond.ni_filecaps.fc_rights, 3722 &cap_unlinkat_rights); 3723 if (error != 0) 3724 goto out; 3725 } 3726 #endif 3727 } 3728 if (fvp == tdvp) { 3729 error = EINVAL; 3730 goto out; 3731 } 3732 /* 3733 * If the source is the same as the destination (that is, if they 3734 * are links to the same vnode), then there is nothing to do. 3735 */ 3736 if (fvp == tvp) 3737 error = ERESTART; 3738 #ifdef MAC 3739 else 3740 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3741 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3742 #endif 3743 out: 3744 if (error == 0) { 3745 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3746 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3747 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3748 NDFREE(&tond, NDF_ONLY_PNBUF); 3749 } else { 3750 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3751 NDFREE(&tond, NDF_ONLY_PNBUF); 3752 if (tvp != NULL) 3753 vput(tvp); 3754 if (tdvp == tvp) 3755 vrele(tdvp); 3756 else 3757 vput(tdvp); 3758 vrele(fromnd.ni_dvp); 3759 vrele(fvp); 3760 } 3761 vrele(tond.ni_startdir); 3762 vn_finished_write(mp); 3763 out1: 3764 if (fromnd.ni_startdir) 3765 vrele(fromnd.ni_startdir); 3766 if (error == ERESTART) 3767 return (0); 3768 if (error == ERELOOKUP) 3769 goto again; 3770 return (error); 3771 } 3772 3773 /* 3774 * Make a directory file. 3775 */ 3776 #ifndef _SYS_SYSPROTO_H_ 3777 struct mkdir_args { 3778 char *path; 3779 int mode; 3780 }; 3781 #endif 3782 int 3783 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3784 { 3785 3786 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3787 uap->mode)); 3788 } 3789 3790 #ifndef _SYS_SYSPROTO_H_ 3791 struct mkdirat_args { 3792 int fd; 3793 char *path; 3794 mode_t mode; 3795 }; 3796 #endif 3797 int 3798 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3799 { 3800 3801 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3802 } 3803 3804 int 3805 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3806 int mode) 3807 { 3808 struct mount *mp; 3809 struct vattr vattr; 3810 struct nameidata nd; 3811 int error; 3812 3813 AUDIT_ARG_MODE(mode); 3814 NDPREINIT(&nd); 3815 restart: 3816 bwillwrite(); 3817 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3818 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR, 3819 segflg, path, fd, &cap_mkdirat_rights, td); 3820 if ((error = namei(&nd)) != 0) 3821 return (error); 3822 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3823 NDFREE(&nd, NDF_ONLY_PNBUF); 3824 vput(nd.ni_dvp); 3825 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3826 return (error); 3827 goto restart; 3828 } 3829 VATTR_NULL(&vattr); 3830 vattr.va_type = VDIR; 3831 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask; 3832 #ifdef MAC 3833 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3834 &vattr); 3835 if (error != 0) 3836 goto out; 3837 #endif 3838 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3839 #ifdef MAC 3840 out: 3841 #endif 3842 NDFREE(&nd, NDF_ONLY_PNBUF); 3843 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 3844 vn_finished_write(mp); 3845 if (error == ERELOOKUP) 3846 goto restart; 3847 return (error); 3848 } 3849 3850 /* 3851 * Remove a directory file. 3852 */ 3853 #ifndef _SYS_SYSPROTO_H_ 3854 struct rmdir_args { 3855 char *path; 3856 }; 3857 #endif 3858 int 3859 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3860 { 3861 3862 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3863 0)); 3864 } 3865 3866 int 3867 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3868 enum uio_seg pathseg, int flag) 3869 { 3870 struct mount *mp; 3871 struct vnode *vp; 3872 struct file *fp; 3873 struct nameidata nd; 3874 cap_rights_t rights; 3875 int error; 3876 3877 fp = NULL; 3878 if (fd != FD_NONE) { 3879 error = getvnode(td, fd, cap_rights_init_one(&rights, 3880 CAP_LOOKUP), &fp); 3881 if (error != 0) 3882 return (error); 3883 } 3884 3885 NDPREINIT(&nd); 3886 restart: 3887 bwillwrite(); 3888 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3889 at2cnpflags(flag, AT_RESOLVE_BENEATH), 3890 pathseg, path, dfd, &cap_unlinkat_rights, td); 3891 if ((error = namei(&nd)) != 0) 3892 goto fdout; 3893 vp = nd.ni_vp; 3894 if (vp->v_type != VDIR) { 3895 error = ENOTDIR; 3896 goto out; 3897 } 3898 /* 3899 * No rmdir "." please. 3900 */ 3901 if (nd.ni_dvp == vp) { 3902 error = EINVAL; 3903 goto out; 3904 } 3905 /* 3906 * The root of a mounted filesystem cannot be deleted. 3907 */ 3908 if (vp->v_vflag & VV_ROOT) { 3909 error = EBUSY; 3910 goto out; 3911 } 3912 3913 if (fp != NULL && fp->f_vnode != vp) { 3914 if (VN_IS_DOOMED(fp->f_vnode)) 3915 error = EBADF; 3916 else 3917 error = EDEADLK; 3918 goto out; 3919 } 3920 3921 #ifdef MAC 3922 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3923 &nd.ni_cnd); 3924 if (error != 0) 3925 goto out; 3926 #endif 3927 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3928 NDFREE(&nd, NDF_ONLY_PNBUF); 3929 vput(vp); 3930 if (nd.ni_dvp == vp) 3931 vrele(nd.ni_dvp); 3932 else 3933 vput(nd.ni_dvp); 3934 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3935 goto fdout; 3936 goto restart; 3937 } 3938 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3939 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3940 vn_finished_write(mp); 3941 out: 3942 NDFREE(&nd, NDF_ONLY_PNBUF); 3943 vput(vp); 3944 if (nd.ni_dvp == vp) 3945 vrele(nd.ni_dvp); 3946 else 3947 vput(nd.ni_dvp); 3948 if (error == ERELOOKUP) 3949 goto restart; 3950 fdout: 3951 if (fp != NULL) 3952 fdrop(fp, td); 3953 return (error); 3954 } 3955 3956 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3957 int 3958 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3959 long *basep, void (*func)(struct freebsd11_dirent *)) 3960 { 3961 struct freebsd11_dirent dstdp; 3962 struct dirent *dp, *edp; 3963 char *dirbuf; 3964 off_t base; 3965 ssize_t resid, ucount; 3966 int error; 3967 3968 /* XXX arbitrary sanity limit on `count'. */ 3969 count = min(count, 64 * 1024); 3970 3971 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3972 3973 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3974 UIO_SYSSPACE); 3975 if (error != 0) 3976 goto done; 3977 if (basep != NULL) 3978 *basep = base; 3979 3980 ucount = 0; 3981 for (dp = (struct dirent *)dirbuf, 3982 edp = (struct dirent *)&dirbuf[count - resid]; 3983 ucount < count && dp < edp; ) { 3984 if (dp->d_reclen == 0) 3985 break; 3986 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3987 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3988 continue; 3989 dstdp.d_type = dp->d_type; 3990 dstdp.d_namlen = dp->d_namlen; 3991 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3992 if (dstdp.d_fileno != dp->d_fileno) { 3993 switch (ino64_trunc_error) { 3994 default: 3995 case 0: 3996 break; 3997 case 1: 3998 error = EOVERFLOW; 3999 goto done; 4000 case 2: 4001 dstdp.d_fileno = UINT32_MAX; 4002 break; 4003 } 4004 } 4005 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 4006 ((dp->d_namlen + 1 + 3) &~ 3); 4007 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 4008 bzero(dstdp.d_name + dstdp.d_namlen, 4009 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 4010 dstdp.d_namlen); 4011 MPASS(dstdp.d_reclen <= dp->d_reclen); 4012 MPASS(ucount + dstdp.d_reclen <= count); 4013 if (func != NULL) 4014 func(&dstdp); 4015 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 4016 if (error != 0) 4017 break; 4018 dp = (struct dirent *)((char *)dp + dp->d_reclen); 4019 ucount += dstdp.d_reclen; 4020 } 4021 4022 done: 4023 free(dirbuf, M_TEMP); 4024 if (error == 0) 4025 td->td_retval[0] = ucount; 4026 return (error); 4027 } 4028 #endif /* COMPAT */ 4029 4030 #ifdef COMPAT_43 4031 static void 4032 ogetdirentries_cvt(struct freebsd11_dirent *dp) 4033 { 4034 #if (BYTE_ORDER == LITTLE_ENDIAN) 4035 /* 4036 * The expected low byte of dp->d_namlen is our dp->d_type. 4037 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 4038 */ 4039 dp->d_type = dp->d_namlen; 4040 dp->d_namlen = 0; 4041 #else 4042 /* 4043 * The dp->d_type is the high byte of the expected dp->d_namlen, 4044 * so must be zero'ed. 4045 */ 4046 dp->d_type = 0; 4047 #endif 4048 } 4049 4050 /* 4051 * Read a block of directory entries in a filesystem independent format. 4052 */ 4053 #ifndef _SYS_SYSPROTO_H_ 4054 struct ogetdirentries_args { 4055 int fd; 4056 char *buf; 4057 u_int count; 4058 long *basep; 4059 }; 4060 #endif 4061 int 4062 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 4063 { 4064 long loff; 4065 int error; 4066 4067 error = kern_ogetdirentries(td, uap, &loff); 4068 if (error == 0) 4069 error = copyout(&loff, uap->basep, sizeof(long)); 4070 return (error); 4071 } 4072 4073 int 4074 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 4075 long *ploff) 4076 { 4077 long base; 4078 int error; 4079 4080 /* XXX arbitrary sanity limit on `count'. */ 4081 if (uap->count > 64 * 1024) 4082 return (EINVAL); 4083 4084 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4085 &base, ogetdirentries_cvt); 4086 4087 if (error == 0 && uap->basep != NULL) 4088 error = copyout(&base, uap->basep, sizeof(long)); 4089 4090 return (error); 4091 } 4092 #endif /* COMPAT_43 */ 4093 4094 #if defined(COMPAT_FREEBSD11) 4095 #ifndef _SYS_SYSPROTO_H_ 4096 struct freebsd11_getdirentries_args { 4097 int fd; 4098 char *buf; 4099 u_int count; 4100 long *basep; 4101 }; 4102 #endif 4103 int 4104 freebsd11_getdirentries(struct thread *td, 4105 struct freebsd11_getdirentries_args *uap) 4106 { 4107 long base; 4108 int error; 4109 4110 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4111 &base, NULL); 4112 4113 if (error == 0 && uap->basep != NULL) 4114 error = copyout(&base, uap->basep, sizeof(long)); 4115 return (error); 4116 } 4117 4118 int 4119 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 4120 { 4121 struct freebsd11_getdirentries_args ap; 4122 4123 ap.fd = uap->fd; 4124 ap.buf = uap->buf; 4125 ap.count = uap->count; 4126 ap.basep = NULL; 4127 return (freebsd11_getdirentries(td, &ap)); 4128 } 4129 #endif /* COMPAT_FREEBSD11 */ 4130 4131 /* 4132 * Read a block of directory entries in a filesystem independent format. 4133 */ 4134 int 4135 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4136 { 4137 off_t base; 4138 int error; 4139 4140 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4141 NULL, UIO_USERSPACE); 4142 if (error != 0) 4143 return (error); 4144 if (uap->basep != NULL) 4145 error = copyout(&base, uap->basep, sizeof(off_t)); 4146 return (error); 4147 } 4148 4149 int 4150 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4151 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4152 { 4153 struct vnode *vp; 4154 struct file *fp; 4155 struct uio auio; 4156 struct iovec aiov; 4157 off_t loff; 4158 int error, eofflag; 4159 off_t foffset; 4160 4161 AUDIT_ARG_FD(fd); 4162 if (count > IOSIZE_MAX) 4163 return (EINVAL); 4164 auio.uio_resid = count; 4165 error = getvnode(td, fd, &cap_read_rights, &fp); 4166 if (error != 0) 4167 return (error); 4168 if ((fp->f_flag & FREAD) == 0) { 4169 fdrop(fp, td); 4170 return (EBADF); 4171 } 4172 vp = fp->f_vnode; 4173 foffset = foffset_lock(fp, 0); 4174 unionread: 4175 if (vp->v_type != VDIR) { 4176 error = EINVAL; 4177 goto fail; 4178 } 4179 aiov.iov_base = buf; 4180 aiov.iov_len = count; 4181 auio.uio_iov = &aiov; 4182 auio.uio_iovcnt = 1; 4183 auio.uio_rw = UIO_READ; 4184 auio.uio_segflg = bufseg; 4185 auio.uio_td = td; 4186 vn_lock(vp, LK_SHARED | LK_RETRY); 4187 AUDIT_ARG_VNODE1(vp); 4188 loff = auio.uio_offset = foffset; 4189 #ifdef MAC 4190 error = mac_vnode_check_readdir(td->td_ucred, vp); 4191 if (error == 0) 4192 #endif 4193 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4194 NULL); 4195 foffset = auio.uio_offset; 4196 if (error != 0) { 4197 VOP_UNLOCK(vp); 4198 goto fail; 4199 } 4200 if (count == auio.uio_resid && 4201 (vp->v_vflag & VV_ROOT) && 4202 (vp->v_mount->mnt_flag & MNT_UNION)) { 4203 struct vnode *tvp = vp; 4204 4205 vp = vp->v_mount->mnt_vnodecovered; 4206 VREF(vp); 4207 fp->f_vnode = vp; 4208 foffset = 0; 4209 vput(tvp); 4210 goto unionread; 4211 } 4212 VOP_UNLOCK(vp); 4213 *basep = loff; 4214 if (residp != NULL) 4215 *residp = auio.uio_resid; 4216 td->td_retval[0] = count - auio.uio_resid; 4217 fail: 4218 foffset_unlock(fp, foffset, 0); 4219 fdrop(fp, td); 4220 return (error); 4221 } 4222 4223 /* 4224 * Set the mode mask for creation of filesystem nodes. 4225 */ 4226 #ifndef _SYS_SYSPROTO_H_ 4227 struct umask_args { 4228 int newmask; 4229 }; 4230 #endif 4231 int 4232 sys_umask(struct thread *td, struct umask_args *uap) 4233 { 4234 struct pwddesc *pdp; 4235 4236 pdp = td->td_proc->p_pd; 4237 PWDDESC_XLOCK(pdp); 4238 td->td_retval[0] = pdp->pd_cmask; 4239 pdp->pd_cmask = uap->newmask & ALLPERMS; 4240 PWDDESC_XUNLOCK(pdp); 4241 return (0); 4242 } 4243 4244 /* 4245 * Void all references to file by ripping underlying filesystem away from 4246 * vnode. 4247 */ 4248 #ifndef _SYS_SYSPROTO_H_ 4249 struct revoke_args { 4250 char *path; 4251 }; 4252 #endif 4253 int 4254 sys_revoke(struct thread *td, struct revoke_args *uap) 4255 { 4256 struct vnode *vp; 4257 struct vattr vattr; 4258 struct nameidata nd; 4259 int error; 4260 4261 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4262 uap->path, td); 4263 if ((error = namei(&nd)) != 0) 4264 return (error); 4265 vp = nd.ni_vp; 4266 NDFREE_NOTHING(&nd); 4267 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4268 error = EINVAL; 4269 goto out; 4270 } 4271 #ifdef MAC 4272 error = mac_vnode_check_revoke(td->td_ucred, vp); 4273 if (error != 0) 4274 goto out; 4275 #endif 4276 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4277 if (error != 0) 4278 goto out; 4279 if (td->td_ucred->cr_uid != vattr.va_uid) { 4280 error = priv_check(td, PRIV_VFS_ADMIN); 4281 if (error != 0) 4282 goto out; 4283 } 4284 if (devfs_usecount(vp) > 0) 4285 VOP_REVOKE(vp, REVOKEALL); 4286 out: 4287 vput(vp); 4288 return (error); 4289 } 4290 4291 /* 4292 * This variant of getvnode() allows O_PATH files. Caller should 4293 * ensure that returned file and vnode are only used for compatible 4294 * semantics. 4295 */ 4296 int 4297 getvnode_path(struct thread *td, int fd, cap_rights_t *rightsp, 4298 struct file **fpp) 4299 { 4300 struct file *fp; 4301 int error; 4302 4303 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp); 4304 if (error != 0) 4305 return (error); 4306 4307 /* 4308 * The file could be not of the vnode type, or it may be not 4309 * yet fully initialized, in which case the f_vnode pointer 4310 * may be set, but f_ops is still badfileops. E.g., 4311 * devfs_open() transiently create such situation to 4312 * facilitate csw d_fdopen(). 4313 * 4314 * Dupfdopen() handling in kern_openat() installs the 4315 * half-baked file into the process descriptor table, allowing 4316 * other thread to dereference it. Guard against the race by 4317 * checking f_ops. 4318 */ 4319 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4320 fdrop(fp, td); 4321 return (EINVAL); 4322 } 4323 4324 *fpp = fp; 4325 return (0); 4326 } 4327 4328 /* 4329 * Convert a user file descriptor to a kernel file entry and check 4330 * that, if it is a capability, the correct rights are present. 4331 * A reference on the file entry is held upon returning. 4332 */ 4333 int 4334 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4335 { 4336 int error; 4337 4338 error = getvnode_path(td, fd, rightsp, fpp); 4339 4340 /* 4341 * Filter out O_PATH file descriptors, most getvnode() callers 4342 * do not call fo_ methods. 4343 */ 4344 if (error == 0 && (*fpp)->f_ops == &path_fileops) { 4345 fdrop(*fpp, td); 4346 error = EBADF; 4347 } 4348 4349 return (error); 4350 } 4351 4352 /* 4353 * Get an (NFS) file handle. 4354 */ 4355 #ifndef _SYS_SYSPROTO_H_ 4356 struct lgetfh_args { 4357 char *fname; 4358 fhandle_t *fhp; 4359 }; 4360 #endif 4361 int 4362 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4363 { 4364 4365 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4366 UIO_USERSPACE, uap->fhp, UIO_USERSPACE)); 4367 } 4368 4369 #ifndef _SYS_SYSPROTO_H_ 4370 struct getfh_args { 4371 char *fname; 4372 fhandle_t *fhp; 4373 }; 4374 #endif 4375 int 4376 sys_getfh(struct thread *td, struct getfh_args *uap) 4377 { 4378 4379 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4380 uap->fhp, UIO_USERSPACE)); 4381 } 4382 4383 /* 4384 * syscall for the rpc.lockd to use to translate an open descriptor into 4385 * a NFS file handle. 4386 * 4387 * warning: do not remove the priv_check() call or this becomes one giant 4388 * security hole. 4389 */ 4390 #ifndef _SYS_SYSPROTO_H_ 4391 struct getfhat_args { 4392 int fd; 4393 char *path; 4394 fhandle_t *fhp; 4395 int flags; 4396 }; 4397 #endif 4398 int 4399 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4400 { 4401 4402 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4403 return (EINVAL); 4404 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4405 uap->fhp, UIO_USERSPACE)); 4406 } 4407 4408 int 4409 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4410 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg) 4411 { 4412 struct nameidata nd; 4413 fhandle_t fh; 4414 struct vnode *vp; 4415 int error; 4416 4417 error = priv_check(td, PRIV_VFS_GETFH); 4418 if (error != 0) 4419 return (error); 4420 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4421 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4422 fd, td); 4423 error = namei(&nd); 4424 if (error != 0) 4425 return (error); 4426 NDFREE_NOTHING(&nd); 4427 vp = nd.ni_vp; 4428 bzero(&fh, sizeof(fh)); 4429 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4430 error = VOP_VPTOFH(vp, &fh.fh_fid); 4431 vput(vp); 4432 if (error == 0) { 4433 if (fhseg == UIO_USERSPACE) 4434 error = copyout(&fh, fhp, sizeof (fh)); 4435 else 4436 memcpy(fhp, &fh, sizeof(fh)); 4437 } 4438 return (error); 4439 } 4440 4441 #ifndef _SYS_SYSPROTO_H_ 4442 struct fhlink_args { 4443 fhandle_t *fhp; 4444 const char *to; 4445 }; 4446 #endif 4447 int 4448 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4449 { 4450 4451 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4452 } 4453 4454 #ifndef _SYS_SYSPROTO_H_ 4455 struct fhlinkat_args { 4456 fhandle_t *fhp; 4457 int tofd; 4458 const char *to; 4459 }; 4460 #endif 4461 int 4462 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4463 { 4464 4465 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4466 } 4467 4468 static int 4469 kern_fhlinkat(struct thread *td, int fd, const char *path, 4470 enum uio_seg pathseg, fhandle_t *fhp) 4471 { 4472 fhandle_t fh; 4473 struct mount *mp; 4474 struct vnode *vp; 4475 int error; 4476 4477 error = priv_check(td, PRIV_VFS_GETFH); 4478 if (error != 0) 4479 return (error); 4480 error = copyin(fhp, &fh, sizeof(fh)); 4481 if (error != 0) 4482 return (error); 4483 do { 4484 bwillwrite(); 4485 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4486 return (ESTALE); 4487 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4488 vfs_unbusy(mp); 4489 if (error != 0) 4490 return (error); 4491 VOP_UNLOCK(vp); 4492 error = kern_linkat_vp(td, vp, fd, path, pathseg); 4493 } while (error == EAGAIN || error == ERELOOKUP); 4494 return (error); 4495 } 4496 4497 #ifndef _SYS_SYSPROTO_H_ 4498 struct fhreadlink_args { 4499 fhandle_t *fhp; 4500 char *buf; 4501 size_t bufsize; 4502 }; 4503 #endif 4504 int 4505 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4506 { 4507 fhandle_t fh; 4508 struct mount *mp; 4509 struct vnode *vp; 4510 int error; 4511 4512 error = priv_check(td, PRIV_VFS_GETFH); 4513 if (error != 0) 4514 return (error); 4515 if (uap->bufsize > IOSIZE_MAX) 4516 return (EINVAL); 4517 error = copyin(uap->fhp, &fh, sizeof(fh)); 4518 if (error != 0) 4519 return (error); 4520 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4521 return (ESTALE); 4522 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4523 vfs_unbusy(mp); 4524 if (error != 0) 4525 return (error); 4526 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4527 vput(vp); 4528 return (error); 4529 } 4530 4531 /* 4532 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4533 * open descriptor. 4534 * 4535 * warning: do not remove the priv_check() call or this becomes one giant 4536 * security hole. 4537 */ 4538 #ifndef _SYS_SYSPROTO_H_ 4539 struct fhopen_args { 4540 const struct fhandle *u_fhp; 4541 int flags; 4542 }; 4543 #endif 4544 int 4545 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4546 { 4547 return (kern_fhopen(td, uap->u_fhp, uap->flags)); 4548 } 4549 4550 int 4551 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags) 4552 { 4553 struct mount *mp; 4554 struct vnode *vp; 4555 struct fhandle fhp; 4556 struct file *fp; 4557 int fmode, error; 4558 int indx; 4559 4560 error = priv_check(td, PRIV_VFS_FHOPEN); 4561 if (error != 0) 4562 return (error); 4563 indx = -1; 4564 fmode = FFLAGS(flags); 4565 /* why not allow a non-read/write open for our lockd? */ 4566 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4567 return (EINVAL); 4568 error = copyin(u_fhp, &fhp, sizeof(fhp)); 4569 if (error != 0) 4570 return(error); 4571 /* find the mount point */ 4572 mp = vfs_busyfs(&fhp.fh_fsid); 4573 if (mp == NULL) 4574 return (ESTALE); 4575 /* now give me my vnode, it gets returned to me locked */ 4576 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4577 vfs_unbusy(mp); 4578 if (error != 0) 4579 return (error); 4580 4581 error = falloc_noinstall(td, &fp); 4582 if (error != 0) { 4583 vput(vp); 4584 return (error); 4585 } 4586 /* 4587 * An extra reference on `fp' has been held for us by 4588 * falloc_noinstall(). 4589 */ 4590 4591 #ifdef INVARIANTS 4592 td->td_dupfd = -1; 4593 #endif 4594 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4595 if (error != 0) { 4596 KASSERT(fp->f_ops == &badfileops, 4597 ("VOP_OPEN in fhopen() set f_ops")); 4598 KASSERT(td->td_dupfd < 0, 4599 ("fhopen() encountered fdopen()")); 4600 4601 vput(vp); 4602 goto bad; 4603 } 4604 #ifdef INVARIANTS 4605 td->td_dupfd = 0; 4606 #endif 4607 fp->f_vnode = vp; 4608 finit_vnode(fp, fmode, NULL, &vnops); 4609 VOP_UNLOCK(vp); 4610 if ((fmode & O_TRUNC) != 0) { 4611 error = fo_truncate(fp, 0, td->td_ucred, td); 4612 if (error != 0) 4613 goto bad; 4614 } 4615 4616 error = finstall(td, fp, &indx, fmode, NULL); 4617 bad: 4618 fdrop(fp, td); 4619 td->td_retval[0] = indx; 4620 return (error); 4621 } 4622 4623 /* 4624 * Stat an (NFS) file handle. 4625 */ 4626 #ifndef _SYS_SYSPROTO_H_ 4627 struct fhstat_args { 4628 struct fhandle *u_fhp; 4629 struct stat *sb; 4630 }; 4631 #endif 4632 int 4633 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4634 { 4635 struct stat sb; 4636 struct fhandle fh; 4637 int error; 4638 4639 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4640 if (error != 0) 4641 return (error); 4642 error = kern_fhstat(td, fh, &sb); 4643 if (error == 0) 4644 error = copyout(&sb, uap->sb, sizeof(sb)); 4645 return (error); 4646 } 4647 4648 int 4649 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4650 { 4651 struct mount *mp; 4652 struct vnode *vp; 4653 int error; 4654 4655 error = priv_check(td, PRIV_VFS_FHSTAT); 4656 if (error != 0) 4657 return (error); 4658 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4659 return (ESTALE); 4660 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4661 vfs_unbusy(mp); 4662 if (error != 0) 4663 return (error); 4664 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED, td); 4665 vput(vp); 4666 return (error); 4667 } 4668 4669 /* 4670 * Implement fstatfs() for (NFS) file handles. 4671 */ 4672 #ifndef _SYS_SYSPROTO_H_ 4673 struct fhstatfs_args { 4674 struct fhandle *u_fhp; 4675 struct statfs *buf; 4676 }; 4677 #endif 4678 int 4679 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4680 { 4681 struct statfs *sfp; 4682 fhandle_t fh; 4683 int error; 4684 4685 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4686 if (error != 0) 4687 return (error); 4688 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4689 error = kern_fhstatfs(td, fh, sfp); 4690 if (error == 0) 4691 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4692 free(sfp, M_STATFS); 4693 return (error); 4694 } 4695 4696 int 4697 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4698 { 4699 struct mount *mp; 4700 struct vnode *vp; 4701 int error; 4702 4703 error = priv_check(td, PRIV_VFS_FHSTATFS); 4704 if (error != 0) 4705 return (error); 4706 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4707 return (ESTALE); 4708 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4709 if (error != 0) { 4710 vfs_unbusy(mp); 4711 return (error); 4712 } 4713 vput(vp); 4714 error = prison_canseemount(td->td_ucred, mp); 4715 if (error != 0) 4716 goto out; 4717 #ifdef MAC 4718 error = mac_mount_check_stat(td->td_ucred, mp); 4719 if (error != 0) 4720 goto out; 4721 #endif 4722 error = VFS_STATFS(mp, buf); 4723 out: 4724 vfs_unbusy(mp); 4725 return (error); 4726 } 4727 4728 /* 4729 * Unlike madvise(2), we do not make a best effort to remember every 4730 * possible caching hint. Instead, we remember the last setting with 4731 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4732 * region of any current setting. 4733 */ 4734 int 4735 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4736 int advice) 4737 { 4738 struct fadvise_info *fa, *new; 4739 struct file *fp; 4740 struct vnode *vp; 4741 off_t end; 4742 int error; 4743 4744 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4745 return (EINVAL); 4746 AUDIT_ARG_VALUE(advice); 4747 switch (advice) { 4748 case POSIX_FADV_SEQUENTIAL: 4749 case POSIX_FADV_RANDOM: 4750 case POSIX_FADV_NOREUSE: 4751 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4752 break; 4753 case POSIX_FADV_NORMAL: 4754 case POSIX_FADV_WILLNEED: 4755 case POSIX_FADV_DONTNEED: 4756 new = NULL; 4757 break; 4758 default: 4759 return (EINVAL); 4760 } 4761 /* XXX: CAP_POSIX_FADVISE? */ 4762 AUDIT_ARG_FD(fd); 4763 error = fget(td, fd, &cap_no_rights, &fp); 4764 if (error != 0) 4765 goto out; 4766 AUDIT_ARG_FILE(td->td_proc, fp); 4767 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4768 error = ESPIPE; 4769 goto out; 4770 } 4771 if (fp->f_type != DTYPE_VNODE) { 4772 error = ENODEV; 4773 goto out; 4774 } 4775 vp = fp->f_vnode; 4776 if (vp->v_type != VREG) { 4777 error = ENODEV; 4778 goto out; 4779 } 4780 if (len == 0) 4781 end = OFF_MAX; 4782 else 4783 end = offset + len - 1; 4784 switch (advice) { 4785 case POSIX_FADV_SEQUENTIAL: 4786 case POSIX_FADV_RANDOM: 4787 case POSIX_FADV_NOREUSE: 4788 /* 4789 * Try to merge any existing non-standard region with 4790 * this new region if possible, otherwise create a new 4791 * non-standard region for this request. 4792 */ 4793 mtx_pool_lock(mtxpool_sleep, fp); 4794 fa = fp->f_advice; 4795 if (fa != NULL && fa->fa_advice == advice && 4796 ((fa->fa_start <= end && fa->fa_end >= offset) || 4797 (end != OFF_MAX && fa->fa_start == end + 1) || 4798 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4799 if (offset < fa->fa_start) 4800 fa->fa_start = offset; 4801 if (end > fa->fa_end) 4802 fa->fa_end = end; 4803 } else { 4804 new->fa_advice = advice; 4805 new->fa_start = offset; 4806 new->fa_end = end; 4807 fp->f_advice = new; 4808 new = fa; 4809 } 4810 mtx_pool_unlock(mtxpool_sleep, fp); 4811 break; 4812 case POSIX_FADV_NORMAL: 4813 /* 4814 * If a the "normal" region overlaps with an existing 4815 * non-standard region, trim or remove the 4816 * non-standard region. 4817 */ 4818 mtx_pool_lock(mtxpool_sleep, fp); 4819 fa = fp->f_advice; 4820 if (fa != NULL) { 4821 if (offset <= fa->fa_start && end >= fa->fa_end) { 4822 new = fa; 4823 fp->f_advice = NULL; 4824 } else if (offset <= fa->fa_start && 4825 end >= fa->fa_start) 4826 fa->fa_start = end + 1; 4827 else if (offset <= fa->fa_end && end >= fa->fa_end) 4828 fa->fa_end = offset - 1; 4829 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4830 /* 4831 * If the "normal" region is a middle 4832 * portion of the existing 4833 * non-standard region, just remove 4834 * the whole thing rather than picking 4835 * one side or the other to 4836 * preserve. 4837 */ 4838 new = fa; 4839 fp->f_advice = NULL; 4840 } 4841 } 4842 mtx_pool_unlock(mtxpool_sleep, fp); 4843 break; 4844 case POSIX_FADV_WILLNEED: 4845 case POSIX_FADV_DONTNEED: 4846 error = VOP_ADVISE(vp, offset, end, advice); 4847 break; 4848 } 4849 out: 4850 if (fp != NULL) 4851 fdrop(fp, td); 4852 free(new, M_FADVISE); 4853 return (error); 4854 } 4855 4856 int 4857 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4858 { 4859 int error; 4860 4861 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4862 uap->advice); 4863 return (kern_posix_error(td, error)); 4864 } 4865 4866 int 4867 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 4868 off_t *outoffp, size_t len, unsigned int flags) 4869 { 4870 struct file *infp, *outfp; 4871 struct vnode *invp, *outvp; 4872 int error; 4873 size_t retlen; 4874 void *rl_rcookie, *rl_wcookie; 4875 off_t savinoff, savoutoff; 4876 4877 infp = outfp = NULL; 4878 rl_rcookie = rl_wcookie = NULL; 4879 savinoff = -1; 4880 error = 0; 4881 retlen = 0; 4882 4883 if (flags != 0) { 4884 error = EINVAL; 4885 goto out; 4886 } 4887 if (len > SSIZE_MAX) 4888 /* 4889 * Although the len argument is size_t, the return argument 4890 * is ssize_t (which is signed). Therefore a size that won't 4891 * fit in ssize_t can't be returned. 4892 */ 4893 len = SSIZE_MAX; 4894 4895 /* Get the file structures for the file descriptors. */ 4896 error = fget_read(td, infd, &cap_read_rights, &infp); 4897 if (error != 0) 4898 goto out; 4899 if (infp->f_ops == &badfileops) { 4900 error = EBADF; 4901 goto out; 4902 } 4903 if (infp->f_vnode == NULL) { 4904 error = EINVAL; 4905 goto out; 4906 } 4907 error = fget_write(td, outfd, &cap_write_rights, &outfp); 4908 if (error != 0) 4909 goto out; 4910 if (outfp->f_ops == &badfileops) { 4911 error = EBADF; 4912 goto out; 4913 } 4914 if (outfp->f_vnode == NULL) { 4915 error = EINVAL; 4916 goto out; 4917 } 4918 4919 /* Set the offset pointers to the correct place. */ 4920 if (inoffp == NULL) 4921 inoffp = &infp->f_offset; 4922 if (outoffp == NULL) 4923 outoffp = &outfp->f_offset; 4924 savinoff = *inoffp; 4925 savoutoff = *outoffp; 4926 4927 invp = infp->f_vnode; 4928 outvp = outfp->f_vnode; 4929 /* Sanity check the f_flag bits. */ 4930 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 4931 (infp->f_flag & FREAD) == 0) { 4932 error = EBADF; 4933 goto out; 4934 } 4935 4936 /* If len == 0, just return 0. */ 4937 if (len == 0) 4938 goto out; 4939 4940 /* 4941 * If infp and outfp refer to the same file, the byte ranges cannot 4942 * overlap. 4943 */ 4944 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len > 4945 savoutoff) || (savinoff > savoutoff && savoutoff + len > 4946 savinoff))) { 4947 error = EINVAL; 4948 goto out; 4949 } 4950 4951 /* Range lock the byte ranges for both invp and outvp. */ 4952 for (;;) { 4953 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp + 4954 len); 4955 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp + 4956 len); 4957 if (rl_rcookie != NULL) 4958 break; 4959 vn_rangelock_unlock(outvp, rl_wcookie); 4960 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len); 4961 vn_rangelock_unlock(invp, rl_rcookie); 4962 } 4963 4964 retlen = len; 4965 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen, 4966 flags, infp->f_cred, outfp->f_cred, td); 4967 out: 4968 if (rl_rcookie != NULL) 4969 vn_rangelock_unlock(invp, rl_rcookie); 4970 if (rl_wcookie != NULL) 4971 vn_rangelock_unlock(outvp, rl_wcookie); 4972 if (savinoff != -1 && (error == EINTR || error == ERESTART)) { 4973 *inoffp = savinoff; 4974 *outoffp = savoutoff; 4975 } 4976 if (outfp != NULL) 4977 fdrop(outfp, td); 4978 if (infp != NULL) 4979 fdrop(infp, td); 4980 td->td_retval[0] = retlen; 4981 return (error); 4982 } 4983 4984 int 4985 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 4986 { 4987 off_t inoff, outoff, *inoffp, *outoffp; 4988 int error; 4989 4990 inoffp = outoffp = NULL; 4991 if (uap->inoffp != NULL) { 4992 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 4993 if (error != 0) 4994 return (error); 4995 inoffp = &inoff; 4996 } 4997 if (uap->outoffp != NULL) { 4998 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 4999 if (error != 0) 5000 return (error); 5001 outoffp = &outoff; 5002 } 5003 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 5004 outoffp, uap->len, uap->flags); 5005 if (error == 0 && uap->inoffp != NULL) 5006 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 5007 if (error == 0 && uap->outoffp != NULL) 5008 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 5009 return (error); 5010 } 5011