1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #include "opt_capsicum.h" 39 #include "opt_ktrace.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #ifdef COMPAT_FREEBSD11 44 #include <sys/abi_compat.h> 45 #endif 46 #include <sys/bio.h> 47 #include <sys/buf.h> 48 #include <sys/capsicum.h> 49 #include <sys/disk.h> 50 #include <sys/malloc.h> 51 #include <sys/mount.h> 52 #include <sys/mutex.h> 53 #include <sys/sysproto.h> 54 #include <sys/namei.h> 55 #include <sys/filedesc.h> 56 #include <sys/kernel.h> 57 #include <sys/fcntl.h> 58 #include <sys/file.h> 59 #include <sys/filio.h> 60 #include <sys/limits.h> 61 #include <sys/linker.h> 62 #include <sys/rwlock.h> 63 #include <sys/sdt.h> 64 #include <sys/stat.h> 65 #include <sys/sx.h> 66 #include <sys/unistd.h> 67 #include <sys/vnode.h> 68 #include <sys/priv.h> 69 #include <sys/proc.h> 70 #include <sys/dirent.h> 71 #include <sys/jail.h> 72 #include <sys/syscallsubr.h> 73 #include <sys/sysctl.h> 74 #ifdef KTRACE 75 #include <sys/ktrace.h> 76 #endif 77 78 #include <machine/stdarg.h> 79 80 #include <security/audit/audit.h> 81 #include <security/mac/mac_framework.h> 82 83 #include <vm/vm.h> 84 #include <vm/vm_object.h> 85 #include <vm/vm_page.h> 86 #include <vm/vnode_pager.h> 87 #include <vm/uma.h> 88 89 #include <fs/devfs/devfs.h> 90 91 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 92 93 static int kern_chflagsat(struct thread *td, int fd, const char *path, 94 enum uio_seg pathseg, u_long flags, int atflag); 95 static int setfflags(struct thread *td, struct vnode *, u_long); 96 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 97 static int getutimens(const struct timespec *, enum uio_seg, 98 struct timespec *, int *); 99 static int setutimes(struct thread *td, struct vnode *, 100 const struct timespec *, int, int); 101 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 102 struct thread *td); 103 static int kern_fhlinkat(struct thread *td, int fd, const char *path, 104 enum uio_seg pathseg, fhandle_t *fhp); 105 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, 106 size_t count, struct thread *td); 107 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, 108 const char *path, enum uio_seg segflag); 109 110 uint64_t 111 at2cnpflags(u_int at_flags, u_int mask) 112 { 113 uint64_t res; 114 115 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) != 116 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)); 117 118 res = 0; 119 at_flags &= mask; 120 if ((at_flags & AT_RESOLVE_BENEATH) != 0) 121 res |= RBENEATH; 122 if ((at_flags & AT_SYMLINK_FOLLOW) != 0) 123 res |= FOLLOW; 124 /* NOFOLLOW is pseudo flag */ 125 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) { 126 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 127 FOLLOW; 128 } 129 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0) 130 res |= EMPTYPATH; 131 return (res); 132 } 133 134 int 135 kern_sync(struct thread *td) 136 { 137 struct mount *mp, *nmp; 138 int save; 139 140 mtx_lock(&mountlist_mtx); 141 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 142 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 143 nmp = TAILQ_NEXT(mp, mnt_list); 144 continue; 145 } 146 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 147 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 148 save = curthread_pflags_set(TDP_SYNCIO); 149 vfs_periodic(mp, MNT_NOWAIT); 150 VFS_SYNC(mp, MNT_NOWAIT); 151 curthread_pflags_restore(save); 152 vn_finished_write(mp); 153 } 154 mtx_lock(&mountlist_mtx); 155 nmp = TAILQ_NEXT(mp, mnt_list); 156 vfs_unbusy(mp); 157 } 158 mtx_unlock(&mountlist_mtx); 159 return (0); 160 } 161 162 /* 163 * Sync each mounted filesystem. 164 */ 165 #ifndef _SYS_SYSPROTO_H_ 166 struct sync_args { 167 int dummy; 168 }; 169 #endif 170 /* ARGSUSED */ 171 int 172 sys_sync(struct thread *td, struct sync_args *uap) 173 { 174 175 return (kern_sync(td)); 176 } 177 178 /* 179 * Change filesystem quotas. 180 */ 181 #ifndef _SYS_SYSPROTO_H_ 182 struct quotactl_args { 183 char *path; 184 int cmd; 185 int uid; 186 caddr_t arg; 187 }; 188 #endif 189 int 190 sys_quotactl(struct thread *td, struct quotactl_args *uap) 191 { 192 struct mount *mp; 193 struct nameidata nd; 194 int error; 195 bool mp_busy; 196 197 AUDIT_ARG_CMD(uap->cmd); 198 AUDIT_ARG_UID(uap->uid); 199 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 200 return (EPERM); 201 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 202 uap->path); 203 if ((error = namei(&nd)) != 0) 204 return (error); 205 NDFREE_PNBUF(&nd); 206 mp = nd.ni_vp->v_mount; 207 vfs_ref(mp); 208 vput(nd.ni_vp); 209 error = vfs_busy(mp, 0); 210 if (error != 0) { 211 vfs_rel(mp); 212 return (error); 213 } 214 mp_busy = true; 215 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, &mp_busy); 216 217 /* 218 * Since quota on/off operations typically need to open quota 219 * files, the implementation may need to unbusy the mount point 220 * before calling into namei. Otherwise, unmount might be 221 * started between two vfs_busy() invocations (first is ours, 222 * second is from mount point cross-walk code in lookup()), 223 * causing deadlock. 224 * 225 * Avoid unbusying mp if the implementation indicates it has 226 * already done so. 227 */ 228 if (mp_busy) 229 vfs_unbusy(mp); 230 vfs_rel(mp); 231 return (error); 232 } 233 234 /* 235 * Used by statfs conversion routines to scale the block size up if 236 * necessary so that all of the block counts are <= 'max_size'. Note 237 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 238 * value of 'n'. 239 */ 240 void 241 statfs_scale_blocks(struct statfs *sf, long max_size) 242 { 243 uint64_t count; 244 int shift; 245 246 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 247 248 /* 249 * Attempt to scale the block counts to give a more accurate 250 * overview to userland of the ratio of free space to used 251 * space. To do this, find the largest block count and compute 252 * a divisor that lets it fit into a signed integer <= max_size. 253 */ 254 if (sf->f_bavail < 0) 255 count = -sf->f_bavail; 256 else 257 count = sf->f_bavail; 258 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 259 if (count <= max_size) 260 return; 261 262 count >>= flsl(max_size); 263 shift = 0; 264 while (count > 0) { 265 shift++; 266 count >>=1; 267 } 268 269 sf->f_bsize <<= shift; 270 sf->f_blocks >>= shift; 271 sf->f_bfree >>= shift; 272 sf->f_bavail >>= shift; 273 } 274 275 static int 276 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 277 { 278 int error; 279 280 if (mp == NULL) 281 return (EBADF); 282 error = vfs_busy(mp, 0); 283 vfs_rel(mp); 284 if (error != 0) 285 return (error); 286 #ifdef MAC 287 error = mac_mount_check_stat(td->td_ucred, mp); 288 if (error != 0) 289 goto out; 290 #endif 291 error = VFS_STATFS(mp, buf); 292 if (error != 0) 293 goto out; 294 if (priv_check_cred_vfs_generation(td->td_ucred)) { 295 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 296 prison_enforce_statfs(td->td_ucred, mp, buf); 297 } 298 out: 299 vfs_unbusy(mp); 300 return (error); 301 } 302 303 /* 304 * Get filesystem statistics. 305 */ 306 #ifndef _SYS_SYSPROTO_H_ 307 struct statfs_args { 308 char *path; 309 struct statfs *buf; 310 }; 311 #endif 312 int 313 sys_statfs(struct thread *td, struct statfs_args *uap) 314 { 315 struct statfs *sfp; 316 int error; 317 318 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 319 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 320 if (error == 0) 321 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 322 free(sfp, M_STATFS); 323 return (error); 324 } 325 326 int 327 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg, 328 struct statfs *buf) 329 { 330 struct mount *mp; 331 struct nameidata nd; 332 int error; 333 334 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path); 335 error = namei(&nd); 336 if (error != 0) 337 return (error); 338 NDFREE_PNBUF(&nd); 339 mp = vfs_ref_from_vp(nd.ni_vp); 340 vrele(nd.ni_vp); 341 return (kern_do_statfs(td, mp, buf)); 342 } 343 344 /* 345 * Get filesystem statistics. 346 */ 347 #ifndef _SYS_SYSPROTO_H_ 348 struct fstatfs_args { 349 int fd; 350 struct statfs *buf; 351 }; 352 #endif 353 int 354 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 355 { 356 struct statfs *sfp; 357 int error; 358 359 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 360 error = kern_fstatfs(td, uap->fd, sfp); 361 if (error == 0) 362 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 363 free(sfp, M_STATFS); 364 return (error); 365 } 366 367 int 368 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 369 { 370 struct file *fp; 371 struct mount *mp; 372 struct vnode *vp; 373 int error; 374 375 AUDIT_ARG_FD(fd); 376 error = getvnode_path(td, fd, &cap_fstatfs_rights, &fp); 377 if (error != 0) 378 return (error); 379 vp = fp->f_vnode; 380 #ifdef AUDIT 381 if (AUDITING_TD(td)) { 382 vn_lock(vp, LK_SHARED | LK_RETRY); 383 AUDIT_ARG_VNODE1(vp); 384 VOP_UNLOCK(vp); 385 } 386 #endif 387 mp = vfs_ref_from_vp(vp); 388 fdrop(fp, td); 389 return (kern_do_statfs(td, mp, buf)); 390 } 391 392 /* 393 * Get statistics on all filesystems. 394 */ 395 #ifndef _SYS_SYSPROTO_H_ 396 struct getfsstat_args { 397 struct statfs *buf; 398 long bufsize; 399 int mode; 400 }; 401 #endif 402 int 403 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 404 { 405 size_t count; 406 int error; 407 408 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 409 return (EINVAL); 410 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 411 UIO_USERSPACE, uap->mode); 412 if (error == 0) 413 td->td_retval[0] = count; 414 return (error); 415 } 416 417 /* 418 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 419 * The caller is responsible for freeing memory which will be allocated 420 * in '*buf'. 421 */ 422 int 423 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 424 size_t *countp, enum uio_seg bufseg, int mode) 425 { 426 struct mount *mp, *nmp; 427 struct statfs *sfsp, *sp, *sptmp, *tofree; 428 size_t count, maxcount; 429 int error; 430 431 switch (mode) { 432 case MNT_WAIT: 433 case MNT_NOWAIT: 434 break; 435 default: 436 if (bufseg == UIO_SYSSPACE) 437 *buf = NULL; 438 return (EINVAL); 439 } 440 restart: 441 maxcount = bufsize / sizeof(struct statfs); 442 if (bufsize == 0) { 443 sfsp = NULL; 444 tofree = NULL; 445 } else if (bufseg == UIO_USERSPACE) { 446 sfsp = *buf; 447 tofree = NULL; 448 } else /* if (bufseg == UIO_SYSSPACE) */ { 449 count = 0; 450 mtx_lock(&mountlist_mtx); 451 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 452 count++; 453 } 454 mtx_unlock(&mountlist_mtx); 455 if (maxcount > count) 456 maxcount = count; 457 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 458 M_STATFS, M_WAITOK); 459 } 460 461 count = 0; 462 463 /* 464 * If there is no target buffer they only want the count. 465 * 466 * This could be TAILQ_FOREACH but it is open-coded to match the original 467 * code below. 468 */ 469 if (sfsp == NULL) { 470 mtx_lock(&mountlist_mtx); 471 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 472 if (prison_canseemount(td->td_ucred, mp) != 0) { 473 nmp = TAILQ_NEXT(mp, mnt_list); 474 continue; 475 } 476 #ifdef MAC 477 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 478 nmp = TAILQ_NEXT(mp, mnt_list); 479 continue; 480 } 481 #endif 482 count++; 483 nmp = TAILQ_NEXT(mp, mnt_list); 484 } 485 mtx_unlock(&mountlist_mtx); 486 *countp = count; 487 return (0); 488 } 489 490 /* 491 * They want the entire thing. 492 * 493 * Short-circuit the corner case of no room for anything, avoids 494 * relocking below. 495 */ 496 if (maxcount < 1) { 497 goto out; 498 } 499 500 mtx_lock(&mountlist_mtx); 501 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 502 if (prison_canseemount(td->td_ucred, mp) != 0) { 503 nmp = TAILQ_NEXT(mp, mnt_list); 504 continue; 505 } 506 #ifdef MAC 507 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 508 nmp = TAILQ_NEXT(mp, mnt_list); 509 continue; 510 } 511 #endif 512 if (mode == MNT_WAIT) { 513 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 514 /* 515 * If vfs_busy() failed, and MBF_NOWAIT 516 * wasn't passed, then the mp is gone. 517 * Furthermore, because of MBF_MNTLSTLOCK, 518 * the mountlist_mtx was dropped. We have 519 * no other choice than to start over. 520 */ 521 mtx_unlock(&mountlist_mtx); 522 free(tofree, M_STATFS); 523 goto restart; 524 } 525 } else { 526 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 527 nmp = TAILQ_NEXT(mp, mnt_list); 528 continue; 529 } 530 } 531 sp = &mp->mnt_stat; 532 /* 533 * If MNT_NOWAIT is specified, do not refresh 534 * the fsstat cache. 535 */ 536 if (mode != MNT_NOWAIT) { 537 error = VFS_STATFS(mp, sp); 538 if (error != 0) { 539 mtx_lock(&mountlist_mtx); 540 nmp = TAILQ_NEXT(mp, mnt_list); 541 vfs_unbusy(mp); 542 continue; 543 } 544 } 545 if (priv_check_cred_vfs_generation(td->td_ucred)) { 546 sptmp = malloc(sizeof(struct statfs), M_STATFS, 547 M_WAITOK); 548 *sptmp = *sp; 549 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 550 prison_enforce_statfs(td->td_ucred, mp, sptmp); 551 sp = sptmp; 552 } else 553 sptmp = NULL; 554 if (bufseg == UIO_SYSSPACE) { 555 bcopy(sp, sfsp, sizeof(*sp)); 556 free(sptmp, M_STATFS); 557 } else /* if (bufseg == UIO_USERSPACE) */ { 558 error = copyout(sp, sfsp, sizeof(*sp)); 559 free(sptmp, M_STATFS); 560 if (error != 0) { 561 vfs_unbusy(mp); 562 return (error); 563 } 564 } 565 sfsp++; 566 count++; 567 568 if (count == maxcount) { 569 vfs_unbusy(mp); 570 goto out; 571 } 572 573 mtx_lock(&mountlist_mtx); 574 nmp = TAILQ_NEXT(mp, mnt_list); 575 vfs_unbusy(mp); 576 } 577 mtx_unlock(&mountlist_mtx); 578 out: 579 *countp = count; 580 return (0); 581 } 582 583 #ifdef COMPAT_FREEBSD4 584 /* 585 * Get old format filesystem statistics. 586 */ 587 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 588 589 #ifndef _SYS_SYSPROTO_H_ 590 struct freebsd4_statfs_args { 591 char *path; 592 struct ostatfs *buf; 593 }; 594 #endif 595 int 596 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 597 { 598 struct ostatfs osb; 599 struct statfs *sfp; 600 int error; 601 602 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 603 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 604 if (error == 0) { 605 freebsd4_cvtstatfs(sfp, &osb); 606 error = copyout(&osb, uap->buf, sizeof(osb)); 607 } 608 free(sfp, M_STATFS); 609 return (error); 610 } 611 612 /* 613 * Get filesystem statistics. 614 */ 615 #ifndef _SYS_SYSPROTO_H_ 616 struct freebsd4_fstatfs_args { 617 int fd; 618 struct ostatfs *buf; 619 }; 620 #endif 621 int 622 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 623 { 624 struct ostatfs osb; 625 struct statfs *sfp; 626 int error; 627 628 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 629 error = kern_fstatfs(td, uap->fd, sfp); 630 if (error == 0) { 631 freebsd4_cvtstatfs(sfp, &osb); 632 error = copyout(&osb, uap->buf, sizeof(osb)); 633 } 634 free(sfp, M_STATFS); 635 return (error); 636 } 637 638 /* 639 * Get statistics on all filesystems. 640 */ 641 #ifndef _SYS_SYSPROTO_H_ 642 struct freebsd4_getfsstat_args { 643 struct ostatfs *buf; 644 long bufsize; 645 int mode; 646 }; 647 #endif 648 int 649 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 650 { 651 struct statfs *buf, *sp; 652 struct ostatfs osb; 653 size_t count, size; 654 int error; 655 656 if (uap->bufsize < 0) 657 return (EINVAL); 658 count = uap->bufsize / sizeof(struct ostatfs); 659 if (count > SIZE_MAX / sizeof(struct statfs)) 660 return (EINVAL); 661 size = count * sizeof(struct statfs); 662 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 663 uap->mode); 664 if (error == 0) 665 td->td_retval[0] = count; 666 if (size != 0) { 667 sp = buf; 668 while (count != 0 && error == 0) { 669 freebsd4_cvtstatfs(sp, &osb); 670 error = copyout(&osb, uap->buf, sizeof(osb)); 671 sp++; 672 uap->buf++; 673 count--; 674 } 675 free(buf, M_STATFS); 676 } 677 return (error); 678 } 679 680 /* 681 * Implement fstatfs() for (NFS) file handles. 682 */ 683 #ifndef _SYS_SYSPROTO_H_ 684 struct freebsd4_fhstatfs_args { 685 struct fhandle *u_fhp; 686 struct ostatfs *buf; 687 }; 688 #endif 689 int 690 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 691 { 692 struct ostatfs osb; 693 struct statfs *sfp; 694 fhandle_t fh; 695 int error; 696 697 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 698 if (error != 0) 699 return (error); 700 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 701 error = kern_fhstatfs(td, fh, sfp); 702 if (error == 0) { 703 freebsd4_cvtstatfs(sfp, &osb); 704 error = copyout(&osb, uap->buf, sizeof(osb)); 705 } 706 free(sfp, M_STATFS); 707 return (error); 708 } 709 710 /* 711 * Convert a new format statfs structure to an old format statfs structure. 712 */ 713 static void 714 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 715 { 716 717 statfs_scale_blocks(nsp, LONG_MAX); 718 bzero(osp, sizeof(*osp)); 719 osp->f_bsize = nsp->f_bsize; 720 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 721 osp->f_blocks = nsp->f_blocks; 722 osp->f_bfree = nsp->f_bfree; 723 osp->f_bavail = nsp->f_bavail; 724 osp->f_files = MIN(nsp->f_files, LONG_MAX); 725 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 726 osp->f_owner = nsp->f_owner; 727 osp->f_type = nsp->f_type; 728 osp->f_flags = nsp->f_flags; 729 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 730 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 731 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 732 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 733 strlcpy(osp->f_fstypename, nsp->f_fstypename, 734 MIN(MFSNAMELEN, OMFSNAMELEN)); 735 strlcpy(osp->f_mntonname, nsp->f_mntonname, 736 MIN(MNAMELEN, OMNAMELEN)); 737 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 738 MIN(MNAMELEN, OMNAMELEN)); 739 osp->f_fsid = nsp->f_fsid; 740 } 741 #endif /* COMPAT_FREEBSD4 */ 742 743 #if defined(COMPAT_FREEBSD11) 744 /* 745 * Get old format filesystem statistics. 746 */ 747 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 748 749 int 750 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 751 { 752 struct freebsd11_statfs osb; 753 struct statfs *sfp; 754 int error; 755 756 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 757 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 758 if (error == 0) { 759 freebsd11_cvtstatfs(sfp, &osb); 760 error = copyout(&osb, uap->buf, sizeof(osb)); 761 } 762 free(sfp, M_STATFS); 763 return (error); 764 } 765 766 /* 767 * Get filesystem statistics. 768 */ 769 int 770 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 771 { 772 struct freebsd11_statfs osb; 773 struct statfs *sfp; 774 int error; 775 776 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 777 error = kern_fstatfs(td, uap->fd, sfp); 778 if (error == 0) { 779 freebsd11_cvtstatfs(sfp, &osb); 780 error = copyout(&osb, uap->buf, sizeof(osb)); 781 } 782 free(sfp, M_STATFS); 783 return (error); 784 } 785 786 /* 787 * Get statistics on all filesystems. 788 */ 789 int 790 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 791 { 792 return (kern_freebsd11_getfsstat(td, uap->buf, uap->bufsize, uap->mode)); 793 } 794 795 int 796 kern_freebsd11_getfsstat(struct thread *td, struct freebsd11_statfs * ubuf, 797 long bufsize, int mode) 798 { 799 struct freebsd11_statfs osb; 800 struct statfs *buf, *sp; 801 size_t count, size; 802 int error; 803 804 if (bufsize < 0) 805 return (EINVAL); 806 807 count = bufsize / sizeof(struct ostatfs); 808 size = count * sizeof(struct statfs); 809 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, mode); 810 if (error == 0) 811 td->td_retval[0] = count; 812 if (size > 0) { 813 sp = buf; 814 while (count > 0 && error == 0) { 815 freebsd11_cvtstatfs(sp, &osb); 816 error = copyout(&osb, ubuf, sizeof(osb)); 817 sp++; 818 ubuf++; 819 count--; 820 } 821 free(buf, M_STATFS); 822 } 823 return (error); 824 } 825 826 /* 827 * Implement fstatfs() for (NFS) file handles. 828 */ 829 int 830 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 831 { 832 struct freebsd11_statfs osb; 833 struct statfs *sfp; 834 fhandle_t fh; 835 int error; 836 837 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 838 if (error) 839 return (error); 840 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 841 error = kern_fhstatfs(td, fh, sfp); 842 if (error == 0) { 843 freebsd11_cvtstatfs(sfp, &osb); 844 error = copyout(&osb, uap->buf, sizeof(osb)); 845 } 846 free(sfp, M_STATFS); 847 return (error); 848 } 849 850 /* 851 * Convert a new format statfs structure to an old format statfs structure. 852 */ 853 static void 854 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 855 { 856 857 bzero(osp, sizeof(*osp)); 858 osp->f_version = FREEBSD11_STATFS_VERSION; 859 osp->f_type = nsp->f_type; 860 osp->f_flags = nsp->f_flags; 861 osp->f_bsize = nsp->f_bsize; 862 osp->f_iosize = nsp->f_iosize; 863 osp->f_blocks = nsp->f_blocks; 864 osp->f_bfree = nsp->f_bfree; 865 osp->f_bavail = nsp->f_bavail; 866 osp->f_files = nsp->f_files; 867 osp->f_ffree = nsp->f_ffree; 868 osp->f_syncwrites = nsp->f_syncwrites; 869 osp->f_asyncwrites = nsp->f_asyncwrites; 870 osp->f_syncreads = nsp->f_syncreads; 871 osp->f_asyncreads = nsp->f_asyncreads; 872 osp->f_namemax = nsp->f_namemax; 873 osp->f_owner = nsp->f_owner; 874 osp->f_fsid = nsp->f_fsid; 875 strlcpy(osp->f_fstypename, nsp->f_fstypename, 876 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 877 strlcpy(osp->f_mntonname, nsp->f_mntonname, 878 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 879 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 880 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 881 } 882 #endif /* COMPAT_FREEBSD11 */ 883 884 /* 885 * Change current working directory to a given file descriptor. 886 */ 887 #ifndef _SYS_SYSPROTO_H_ 888 struct fchdir_args { 889 int fd; 890 }; 891 #endif 892 int 893 sys_fchdir(struct thread *td, struct fchdir_args *uap) 894 { 895 struct vnode *vp, *tdp; 896 struct mount *mp; 897 struct file *fp; 898 int error; 899 900 AUDIT_ARG_FD(uap->fd); 901 error = getvnode_path(td, uap->fd, &cap_fchdir_rights, 902 &fp); 903 if (error != 0) 904 return (error); 905 vp = fp->f_vnode; 906 vrefact(vp); 907 fdrop(fp, td); 908 vn_lock(vp, LK_SHARED | LK_RETRY); 909 AUDIT_ARG_VNODE1(vp); 910 error = change_dir(vp, td); 911 while (!error && (mp = vp->v_mountedhere) != NULL) { 912 if (vfs_busy(mp, 0)) 913 continue; 914 error = VFS_ROOT(mp, LK_SHARED, &tdp); 915 vfs_unbusy(mp); 916 if (error != 0) 917 break; 918 vput(vp); 919 vp = tdp; 920 } 921 if (error != 0) { 922 vput(vp); 923 return (error); 924 } 925 VOP_UNLOCK(vp); 926 pwd_chdir(td, vp); 927 return (0); 928 } 929 930 /* 931 * Change current working directory (``.''). 932 */ 933 #ifndef _SYS_SYSPROTO_H_ 934 struct chdir_args { 935 char *path; 936 }; 937 #endif 938 int 939 sys_chdir(struct thread *td, struct chdir_args *uap) 940 { 941 942 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 943 } 944 945 int 946 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg) 947 { 948 struct nameidata nd; 949 int error; 950 951 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 952 pathseg, path); 953 if ((error = namei(&nd)) != 0) 954 return (error); 955 if ((error = change_dir(nd.ni_vp, td)) != 0) { 956 vput(nd.ni_vp); 957 NDFREE_PNBUF(&nd); 958 return (error); 959 } 960 VOP_UNLOCK(nd.ni_vp); 961 NDFREE_PNBUF(&nd); 962 pwd_chdir(td, nd.ni_vp); 963 return (0); 964 } 965 966 static int unprivileged_chroot = 0; 967 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_chroot, CTLFLAG_RW, 968 &unprivileged_chroot, 0, 969 "Unprivileged processes can use chroot(2)"); 970 971 /* 972 * Takes locked vnode, unlocks it before returning. 973 */ 974 static int 975 kern_chroot(struct thread *td, struct vnode *vp) 976 { 977 struct proc *p; 978 int error; 979 980 error = priv_check(td, PRIV_VFS_CHROOT); 981 if (error != 0) { 982 p = td->td_proc; 983 PROC_LOCK(p); 984 if (unprivileged_chroot == 0 || 985 (p->p_flag2 & P2_NO_NEW_PRIVS) == 0) { 986 PROC_UNLOCK(p); 987 goto e_vunlock; 988 } 989 PROC_UNLOCK(p); 990 } 991 992 error = change_dir(vp, td); 993 if (error != 0) 994 goto e_vunlock; 995 #ifdef MAC 996 error = mac_vnode_check_chroot(td->td_ucred, vp); 997 if (error != 0) 998 goto e_vunlock; 999 #endif 1000 VOP_UNLOCK(vp); 1001 error = pwd_chroot(td, vp); 1002 vrele(vp); 1003 return (error); 1004 e_vunlock: 1005 vput(vp); 1006 return (error); 1007 } 1008 1009 /* 1010 * Change notion of root (``/'') directory. 1011 */ 1012 #ifndef _SYS_SYSPROTO_H_ 1013 struct chroot_args { 1014 char *path; 1015 }; 1016 #endif 1017 int 1018 sys_chroot(struct thread *td, struct chroot_args *uap) 1019 { 1020 struct nameidata nd; 1021 int error; 1022 1023 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 1024 UIO_USERSPACE, uap->path); 1025 error = namei(&nd); 1026 if (error != 0) 1027 return (error); 1028 NDFREE_PNBUF(&nd); 1029 error = kern_chroot(td, nd.ni_vp); 1030 return (error); 1031 } 1032 1033 /* 1034 * Change notion of root directory to a given file descriptor. 1035 */ 1036 #ifndef _SYS_SYSPROTO_H_ 1037 struct fchroot_args { 1038 int fd; 1039 }; 1040 #endif 1041 int 1042 sys_fchroot(struct thread *td, struct fchroot_args *uap) 1043 { 1044 struct vnode *vp; 1045 struct file *fp; 1046 int error; 1047 1048 error = getvnode_path(td, uap->fd, &cap_fchroot_rights, &fp); 1049 if (error != 0) 1050 return (error); 1051 vp = fp->f_vnode; 1052 vrefact(vp); 1053 fdrop(fp, td); 1054 vn_lock(vp, LK_SHARED | LK_RETRY); 1055 error = kern_chroot(td, vp); 1056 return (error); 1057 } 1058 1059 /* 1060 * Common routine for chroot and chdir. Callers must provide a locked vnode 1061 * instance. 1062 */ 1063 int 1064 change_dir(struct vnode *vp, struct thread *td) 1065 { 1066 #ifdef MAC 1067 int error; 1068 #endif 1069 1070 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 1071 if (vp->v_type != VDIR) 1072 return (ENOTDIR); 1073 #ifdef MAC 1074 error = mac_vnode_check_chdir(td->td_ucred, vp); 1075 if (error != 0) 1076 return (error); 1077 #endif 1078 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 1079 } 1080 1081 static __inline void 1082 flags_to_rights(int flags, cap_rights_t *rightsp) 1083 { 1084 if (flags & O_EXEC) { 1085 cap_rights_set_one(rightsp, CAP_FEXECVE); 1086 if (flags & O_PATH) 1087 return; 1088 } else { 1089 switch ((flags & O_ACCMODE)) { 1090 case O_RDONLY: 1091 cap_rights_set_one(rightsp, CAP_READ); 1092 break; 1093 case O_RDWR: 1094 cap_rights_set_one(rightsp, CAP_READ); 1095 /* FALLTHROUGH */ 1096 case O_WRONLY: 1097 cap_rights_set_one(rightsp, CAP_WRITE); 1098 if (!(flags & (O_APPEND | O_TRUNC))) 1099 cap_rights_set_one(rightsp, CAP_SEEK); 1100 break; 1101 } 1102 } 1103 1104 if (flags & O_CREAT) 1105 cap_rights_set_one(rightsp, CAP_CREATE); 1106 1107 if (flags & O_TRUNC) 1108 cap_rights_set_one(rightsp, CAP_FTRUNCATE); 1109 1110 if (flags & (O_SYNC | O_FSYNC)) 1111 cap_rights_set_one(rightsp, CAP_FSYNC); 1112 1113 if (flags & (O_EXLOCK | O_SHLOCK)) 1114 cap_rights_set_one(rightsp, CAP_FLOCK); 1115 } 1116 1117 /* 1118 * Check permissions, allocate an open file structure, and call the device 1119 * open routine if any. 1120 */ 1121 #ifndef _SYS_SYSPROTO_H_ 1122 struct open_args { 1123 char *path; 1124 int flags; 1125 int mode; 1126 }; 1127 #endif 1128 int 1129 sys_open(struct thread *td, struct open_args *uap) 1130 { 1131 1132 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1133 uap->flags, uap->mode)); 1134 } 1135 1136 #ifndef _SYS_SYSPROTO_H_ 1137 struct openat_args { 1138 int fd; 1139 char *path; 1140 int flag; 1141 int mode; 1142 }; 1143 #endif 1144 int 1145 sys_openat(struct thread *td, struct openat_args *uap) 1146 { 1147 1148 AUDIT_ARG_FD(uap->fd); 1149 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1150 uap->mode)); 1151 } 1152 1153 /* 1154 * Validate open(2) flags and convert access mode flags (O_RDONLY etc.) to their 1155 * in-kernel representations (FREAD etc.). 1156 */ 1157 static int 1158 openflags(int *flagsp) 1159 { 1160 int flags; 1161 1162 /* 1163 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1164 * may be specified. On the other hand, for O_PATH any mode 1165 * except O_EXEC is ignored. 1166 */ 1167 flags = *flagsp; 1168 if ((flags & O_PATH) != 0) { 1169 flags &= ~O_ACCMODE; 1170 } else if ((flags & O_EXEC) != 0) { 1171 if ((flags & O_ACCMODE) != 0) 1172 return (EINVAL); 1173 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1174 return (EINVAL); 1175 } else { 1176 flags = FFLAGS(flags); 1177 } 1178 *flagsp = flags; 1179 return (0); 1180 } 1181 1182 static void 1183 finit_open(struct file *fp, struct vnode *vp, int flags) 1184 { 1185 /* 1186 * Store the vnode, for any f_type. Typically, the vnode use count is 1187 * decremented by a direct call to vnops.fo_close() for files that 1188 * switched type. 1189 */ 1190 fp->f_vnode = vp; 1191 1192 /* 1193 * If the file wasn't claimed by devfs or fifofs, bind it to the normal 1194 * vnode operations here. 1195 */ 1196 if (fp->f_ops == &badfileops) { 1197 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0, 1198 ("Unexpected fifo fp %p vp %p", fp, vp)); 1199 if ((flags & O_PATH) != 0) { 1200 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED), 1201 DTYPE_VNODE, NULL, &path_fileops); 1202 } else { 1203 finit_vnode(fp, flags, NULL, &vnops); 1204 } 1205 } 1206 } 1207 1208 /* 1209 * If fpp != NULL, opened file is not installed into the file 1210 * descriptor table, instead it is returned in *fpp. This is 1211 * incompatible with fdopen(), in which case we return EINVAL. 1212 */ 1213 static int 1214 openatfp(struct thread *td, int dirfd, const char *path, 1215 enum uio_seg pathseg, int flags, int mode, struct file **fpp) 1216 { 1217 struct proc *p; 1218 struct filedesc *fdp; 1219 struct pwddesc *pdp; 1220 struct file *fp; 1221 struct vnode *vp; 1222 struct filecaps *fcaps; 1223 struct nameidata nd; 1224 cap_rights_t rights; 1225 int cmode, error, indx; 1226 1227 indx = -1; 1228 p = td->td_proc; 1229 fdp = p->p_fd; 1230 pdp = p->p_pd; 1231 1232 AUDIT_ARG_FFLAGS(flags); 1233 AUDIT_ARG_MODE(mode); 1234 cap_rights_init_one(&rights, CAP_LOOKUP); 1235 flags_to_rights(flags, &rights); 1236 1237 error = openflags(&flags); 1238 if (error != 0) 1239 return (error); 1240 1241 /* 1242 * Allocate a file structure. The descriptor to reference it 1243 * is allocated and used by finstall_refed() below. 1244 */ 1245 error = falloc_noinstall(td, &fp); 1246 if (error != 0) 1247 return (error); 1248 /* Set the flags early so the finit in devfs can pick them up. */ 1249 fp->f_flag = flags & FMASK; 1250 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT; 1251 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | WANTIOCTLCAPS, 1252 pathseg, path, dirfd, &rights); 1253 td->td_dupfd = -1; /* XXX check for fdopen */ 1254 error = vn_open_cred(&nd, &flags, cmode, VN_OPEN_WANTIOCTLCAPS, 1255 td->td_ucred, fp); 1256 if (error != 0) { 1257 /* 1258 * If the vn_open replaced the method vector, something 1259 * wonderous happened deep below and we just pass it up 1260 * pretending we know what we do. 1261 */ 1262 if (error == ENXIO && fp->f_ops != &badfileops) { 1263 MPASS((flags & O_PATH) == 0); 1264 goto success; 1265 } 1266 1267 /* 1268 * Handle special fdopen() case. bleh. 1269 * 1270 * Don't do this for relative (capability) lookups; we don't 1271 * understand exactly what would happen, and we don't think 1272 * that it ever should. 1273 */ 1274 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 && 1275 (error == ENODEV || error == ENXIO) && 1276 td->td_dupfd >= 0) { 1277 MPASS(fpp == NULL); 1278 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1279 &indx); 1280 if (error == 0) 1281 goto success; 1282 } 1283 1284 goto bad; 1285 } 1286 td->td_dupfd = 0; 1287 NDFREE_PNBUF(&nd); 1288 vp = nd.ni_vp; 1289 1290 finit_open(fp, vp, flags); 1291 VOP_UNLOCK(vp); 1292 if (flags & O_TRUNC) { 1293 error = fo_truncate(fp, 0, td->td_ucred, td); 1294 if (error != 0) 1295 goto bad; 1296 } 1297 success: 1298 if (fpp != NULL) { 1299 MPASS(error == 0); 1300 NDFREE_IOCTLCAPS(&nd); 1301 *fpp = fp; 1302 return (0); 1303 } 1304 1305 /* 1306 * If we haven't already installed the FD (for dupfdopen), do so now. 1307 */ 1308 if (indx == -1) { 1309 #ifdef CAPABILITIES 1310 if ((nd.ni_resflags & NIRES_STRICTREL) != 0) 1311 fcaps = &nd.ni_filecaps; 1312 else 1313 #endif 1314 fcaps = NULL; 1315 error = finstall_refed(td, fp, &indx, flags, fcaps); 1316 /* On success finstall_refed() consumes fcaps. */ 1317 if (error != 0) { 1318 goto bad; 1319 } 1320 } else { 1321 NDFREE_IOCTLCAPS(&nd); 1322 falloc_abort(td, fp); 1323 } 1324 1325 td->td_retval[0] = indx; 1326 return (0); 1327 bad: 1328 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1329 NDFREE_IOCTLCAPS(&nd); 1330 falloc_abort(td, fp); 1331 return (error); 1332 } 1333 1334 int 1335 kern_openat(struct thread *td, int dirfd, const char *path, 1336 enum uio_seg pathseg, int flags, int mode) 1337 { 1338 return (openatfp(td, dirfd, path, pathseg, flags, mode, NULL)); 1339 } 1340 1341 int 1342 kern_openatfp(struct thread *td, int dirfd, const char *path, 1343 enum uio_seg pathseg, int flags, int mode, struct file **fpp) 1344 { 1345 int error, old_dupfd; 1346 1347 old_dupfd = td->td_dupfd; 1348 td->td_dupfd = -1; 1349 error = openatfp(td, dirfd, path, pathseg, flags, mode, fpp); 1350 td->td_dupfd = old_dupfd; 1351 return (error); 1352 } 1353 1354 #ifdef COMPAT_43 1355 /* 1356 * Create a file. 1357 */ 1358 #ifndef _SYS_SYSPROTO_H_ 1359 struct ocreat_args { 1360 char *path; 1361 int mode; 1362 }; 1363 #endif 1364 int 1365 ocreat(struct thread *td, struct ocreat_args *uap) 1366 { 1367 1368 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1369 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1370 } 1371 #endif /* COMPAT_43 */ 1372 1373 /* 1374 * Create a special file. 1375 */ 1376 #ifndef _SYS_SYSPROTO_H_ 1377 struct mknodat_args { 1378 int fd; 1379 char *path; 1380 mode_t mode; 1381 dev_t dev; 1382 }; 1383 #endif 1384 int 1385 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1386 { 1387 1388 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1389 uap->dev)); 1390 } 1391 1392 #if defined(COMPAT_FREEBSD11) 1393 int 1394 freebsd11_mknod(struct thread *td, 1395 struct freebsd11_mknod_args *uap) 1396 { 1397 1398 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1399 uap->mode, uap->dev)); 1400 } 1401 1402 int 1403 freebsd11_mknodat(struct thread *td, 1404 struct freebsd11_mknodat_args *uap) 1405 { 1406 1407 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1408 uap->dev)); 1409 } 1410 #endif /* COMPAT_FREEBSD11 */ 1411 1412 int 1413 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1414 int mode, dev_t dev) 1415 { 1416 struct vnode *vp; 1417 struct mount *mp; 1418 struct vattr vattr; 1419 struct nameidata nd; 1420 int error, whiteout = 0; 1421 1422 AUDIT_ARG_MODE(mode); 1423 AUDIT_ARG_DEV(dev); 1424 switch (mode & S_IFMT) { 1425 case S_IFCHR: 1426 case S_IFBLK: 1427 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1428 if (error == 0 && dev == VNOVAL) 1429 error = EINVAL; 1430 break; 1431 case S_IFWHT: 1432 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1433 break; 1434 case S_IFIFO: 1435 if (dev == 0) 1436 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1437 /* FALLTHROUGH */ 1438 default: 1439 error = EINVAL; 1440 break; 1441 } 1442 if (error != 0) 1443 return (error); 1444 NDPREINIT(&nd); 1445 restart: 1446 bwillwrite(); 1447 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE, 1448 pathseg, path, fd, &cap_mknodat_rights); 1449 if ((error = namei(&nd)) != 0) 1450 return (error); 1451 vp = nd.ni_vp; 1452 if (vp != NULL) { 1453 NDFREE_PNBUF(&nd); 1454 if (vp == nd.ni_dvp) 1455 vrele(nd.ni_dvp); 1456 else 1457 vput(nd.ni_dvp); 1458 vrele(vp); 1459 return (EEXIST); 1460 } else if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 1461 NDFREE_PNBUF(&nd); 1462 vput(nd.ni_dvp); 1463 return (EINVAL); 1464 } else { 1465 VATTR_NULL(&vattr); 1466 vattr.va_mode = (mode & ALLPERMS) & 1467 ~td->td_proc->p_pd->pd_cmask; 1468 vattr.va_rdev = dev; 1469 whiteout = 0; 1470 1471 switch (mode & S_IFMT) { 1472 case S_IFCHR: 1473 vattr.va_type = VCHR; 1474 break; 1475 case S_IFBLK: 1476 vattr.va_type = VBLK; 1477 break; 1478 case S_IFWHT: 1479 whiteout = 1; 1480 break; 1481 default: 1482 panic("kern_mknod: invalid mode"); 1483 } 1484 } 1485 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1486 NDFREE_PNBUF(&nd); 1487 vput(nd.ni_dvp); 1488 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 1489 return (error); 1490 goto restart; 1491 } 1492 #ifdef MAC 1493 if (error == 0 && !whiteout) 1494 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1495 &nd.ni_cnd, &vattr); 1496 #endif 1497 if (error == 0) { 1498 if (whiteout) 1499 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1500 else { 1501 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1502 &nd.ni_cnd, &vattr); 1503 } 1504 } 1505 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL, 1506 true); 1507 vn_finished_write(mp); 1508 NDFREE_PNBUF(&nd); 1509 if (error == ERELOOKUP) 1510 goto restart; 1511 return (error); 1512 } 1513 1514 /* 1515 * Create a named pipe. 1516 */ 1517 #ifndef _SYS_SYSPROTO_H_ 1518 struct mkfifo_args { 1519 char *path; 1520 int mode; 1521 }; 1522 #endif 1523 int 1524 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1525 { 1526 1527 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1528 uap->mode)); 1529 } 1530 1531 #ifndef _SYS_SYSPROTO_H_ 1532 struct mkfifoat_args { 1533 int fd; 1534 char *path; 1535 mode_t mode; 1536 }; 1537 #endif 1538 int 1539 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1540 { 1541 1542 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1543 uap->mode)); 1544 } 1545 1546 int 1547 kern_mkfifoat(struct thread *td, int fd, const char *path, 1548 enum uio_seg pathseg, int mode) 1549 { 1550 struct mount *mp; 1551 struct vattr vattr; 1552 struct nameidata nd; 1553 int error; 1554 1555 AUDIT_ARG_MODE(mode); 1556 NDPREINIT(&nd); 1557 restart: 1558 bwillwrite(); 1559 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE, 1560 pathseg, path, fd, &cap_mkfifoat_rights); 1561 if ((error = namei(&nd)) != 0) 1562 return (error); 1563 if (nd.ni_vp != NULL) { 1564 NDFREE_PNBUF(&nd); 1565 if (nd.ni_vp == nd.ni_dvp) 1566 vrele(nd.ni_dvp); 1567 else 1568 vput(nd.ni_dvp); 1569 vrele(nd.ni_vp); 1570 return (EEXIST); 1571 } 1572 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 1573 NDFREE_PNBUF(&nd); 1574 vput(nd.ni_dvp); 1575 return (EINVAL); 1576 } 1577 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1578 NDFREE_PNBUF(&nd); 1579 vput(nd.ni_dvp); 1580 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 1581 return (error); 1582 goto restart; 1583 } 1584 VATTR_NULL(&vattr); 1585 vattr.va_type = VFIFO; 1586 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask; 1587 #ifdef MAC 1588 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1589 &vattr); 1590 if (error != 0) 1591 goto out; 1592 #endif 1593 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1594 #ifdef MAC 1595 out: 1596 #endif 1597 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1598 vn_finished_write(mp); 1599 NDFREE_PNBUF(&nd); 1600 if (error == ERELOOKUP) 1601 goto restart; 1602 return (error); 1603 } 1604 1605 /* 1606 * Make a hard file link. 1607 */ 1608 #ifndef _SYS_SYSPROTO_H_ 1609 struct link_args { 1610 char *path; 1611 char *link; 1612 }; 1613 #endif 1614 int 1615 sys_link(struct thread *td, struct link_args *uap) 1616 { 1617 1618 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1619 UIO_USERSPACE, AT_SYMLINK_FOLLOW)); 1620 } 1621 1622 #ifndef _SYS_SYSPROTO_H_ 1623 struct linkat_args { 1624 int fd1; 1625 char *path1; 1626 int fd2; 1627 char *path2; 1628 int flag; 1629 }; 1630 #endif 1631 int 1632 sys_linkat(struct thread *td, struct linkat_args *uap) 1633 { 1634 1635 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1636 UIO_USERSPACE, uap->flag)); 1637 } 1638 1639 int hardlink_check_uid = 0; 1640 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1641 &hardlink_check_uid, 0, 1642 "Unprivileged processes cannot create hard links to files owned by other " 1643 "users"); 1644 static int hardlink_check_gid = 0; 1645 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1646 &hardlink_check_gid, 0, 1647 "Unprivileged processes cannot create hard links to files owned by other " 1648 "groups"); 1649 1650 static int 1651 can_hardlink(struct vnode *vp, struct ucred *cred) 1652 { 1653 struct vattr va; 1654 int error; 1655 1656 if (!hardlink_check_uid && !hardlink_check_gid) 1657 return (0); 1658 1659 error = VOP_GETATTR(vp, &va, cred); 1660 if (error != 0) 1661 return (error); 1662 1663 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1664 error = priv_check_cred(cred, PRIV_VFS_LINK); 1665 if (error != 0) 1666 return (error); 1667 } 1668 1669 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1670 error = priv_check_cred(cred, PRIV_VFS_LINK); 1671 if (error != 0) 1672 return (error); 1673 } 1674 1675 return (0); 1676 } 1677 1678 int 1679 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1680 const char *path2, enum uio_seg segflag, int flag) 1681 { 1682 struct nameidata nd; 1683 int error; 1684 1685 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | 1686 AT_EMPTY_PATH)) != 0) 1687 return (EINVAL); 1688 1689 NDPREINIT(&nd); 1690 do { 1691 bwillwrite(); 1692 NDINIT_ATRIGHTS(&nd, LOOKUP, AUDITVNODE1 | at2cnpflags(flag, 1693 AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | AT_EMPTY_PATH), 1694 segflag, path1, fd1, &cap_linkat_source_rights); 1695 if ((error = namei(&nd)) != 0) 1696 return (error); 1697 NDFREE_PNBUF(&nd); 1698 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) { 1699 error = priv_check(td, PRIV_VFS_FHOPEN); 1700 if (error != 0) { 1701 vrele(nd.ni_vp); 1702 return (error); 1703 } 1704 } 1705 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1706 } while (error == EAGAIN || error == ERELOOKUP); 1707 return (error); 1708 } 1709 1710 static int 1711 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1712 enum uio_seg segflag) 1713 { 1714 struct nameidata nd; 1715 struct mount *mp; 1716 int error; 1717 1718 if (vp->v_type == VDIR) { 1719 vrele(vp); 1720 return (EPERM); /* POSIX */ 1721 } 1722 if ((vn_irflag_read(vp) & (VIRF_NAMEDDIR | VIRF_NAMEDATTR)) != 0) { 1723 vrele(vp); 1724 return (EINVAL); 1725 } 1726 NDINIT_ATRIGHTS(&nd, CREATE, 1727 LOCKPARENT | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1728 &cap_linkat_target_rights); 1729 if ((error = namei(&nd)) == 0) { 1730 if (nd.ni_vp != NULL) { 1731 NDFREE_PNBUF(&nd); 1732 if (nd.ni_dvp == nd.ni_vp) 1733 vrele(nd.ni_dvp); 1734 else 1735 vput(nd.ni_dvp); 1736 vrele(nd.ni_vp); 1737 vrele(vp); 1738 return (EEXIST); 1739 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1740 /* 1741 * Cross-device link. No need to recheck 1742 * vp->v_type, since it cannot change, except 1743 * to VBAD. 1744 */ 1745 NDFREE_PNBUF(&nd); 1746 vput(nd.ni_dvp); 1747 vrele(vp); 1748 return (EXDEV); 1749 } else if (vn_lock(vp, LK_EXCLUSIVE) == 0) { 1750 error = can_hardlink(vp, td->td_ucred); 1751 #ifdef MAC 1752 if (error == 0) 1753 error = mac_vnode_check_link(td->td_ucred, 1754 nd.ni_dvp, vp, &nd.ni_cnd); 1755 #endif 1756 if (error != 0) { 1757 vput(vp); 1758 vput(nd.ni_dvp); 1759 NDFREE_PNBUF(&nd); 1760 return (error); 1761 } 1762 error = vn_start_write(vp, &mp, V_NOWAIT); 1763 if (error != 0) { 1764 vput(vp); 1765 vput(nd.ni_dvp); 1766 NDFREE_PNBUF(&nd); 1767 error = vn_start_write(NULL, &mp, 1768 V_XSLEEP | V_PCATCH); 1769 if (error != 0) 1770 return (error); 1771 return (EAGAIN); 1772 } 1773 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1774 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true); 1775 vn_finished_write(mp); 1776 NDFREE_PNBUF(&nd); 1777 vp = NULL; 1778 } else { 1779 vput(nd.ni_dvp); 1780 NDFREE_PNBUF(&nd); 1781 vrele(vp); 1782 return (EAGAIN); 1783 } 1784 } 1785 if (vp != NULL) 1786 vrele(vp); 1787 return (error); 1788 } 1789 1790 /* 1791 * Make a symbolic link. 1792 */ 1793 #ifndef _SYS_SYSPROTO_H_ 1794 struct symlink_args { 1795 char *path; 1796 char *link; 1797 }; 1798 #endif 1799 int 1800 sys_symlink(struct thread *td, struct symlink_args *uap) 1801 { 1802 1803 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1804 UIO_USERSPACE)); 1805 } 1806 1807 #ifndef _SYS_SYSPROTO_H_ 1808 struct symlinkat_args { 1809 char *path; 1810 int fd; 1811 char *path2; 1812 }; 1813 #endif 1814 int 1815 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1816 { 1817 1818 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1819 UIO_USERSPACE)); 1820 } 1821 1822 int 1823 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1824 enum uio_seg segflg) 1825 { 1826 struct mount *mp; 1827 struct vattr vattr; 1828 const char *syspath; 1829 char *tmppath; 1830 struct nameidata nd; 1831 int error; 1832 1833 if (segflg == UIO_SYSSPACE) { 1834 syspath = path1; 1835 } else { 1836 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1837 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1838 goto out; 1839 syspath = tmppath; 1840 } 1841 AUDIT_ARG_TEXT(syspath); 1842 NDPREINIT(&nd); 1843 restart: 1844 bwillwrite(); 1845 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE, segflg, 1846 path2, fd, &cap_symlinkat_rights); 1847 if ((error = namei(&nd)) != 0) 1848 goto out; 1849 if (nd.ni_vp) { 1850 NDFREE_PNBUF(&nd); 1851 if (nd.ni_vp == nd.ni_dvp) 1852 vrele(nd.ni_dvp); 1853 else 1854 vput(nd.ni_dvp); 1855 vrele(nd.ni_vp); 1856 nd.ni_vp = NULL; 1857 error = EEXIST; 1858 goto out; 1859 } 1860 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1861 NDFREE_PNBUF(&nd); 1862 vput(nd.ni_dvp); 1863 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 1864 goto out; 1865 goto restart; 1866 } 1867 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 1868 error = EINVAL; 1869 goto out; 1870 } 1871 VATTR_NULL(&vattr); 1872 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask; 1873 #ifdef MAC 1874 vattr.va_type = VLNK; 1875 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1876 &vattr); 1877 if (error != 0) 1878 goto out2; 1879 #endif 1880 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1881 #ifdef MAC 1882 out2: 1883 #endif 1884 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1885 vn_finished_write(mp); 1886 NDFREE_PNBUF(&nd); 1887 if (error == ERELOOKUP) 1888 goto restart; 1889 out: 1890 if (segflg != UIO_SYSSPACE) 1891 uma_zfree(namei_zone, tmppath); 1892 return (error); 1893 } 1894 1895 /* 1896 * Delete a whiteout from the filesystem. 1897 */ 1898 #ifndef _SYS_SYSPROTO_H_ 1899 struct undelete_args { 1900 char *path; 1901 }; 1902 #endif 1903 int 1904 sys_undelete(struct thread *td, struct undelete_args *uap) 1905 { 1906 struct mount *mp; 1907 struct nameidata nd; 1908 int error; 1909 1910 NDPREINIT(&nd); 1911 restart: 1912 bwillwrite(); 1913 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1914 UIO_USERSPACE, uap->path); 1915 error = namei(&nd); 1916 if (error != 0) 1917 return (error); 1918 1919 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1920 NDFREE_PNBUF(&nd); 1921 if (nd.ni_vp == nd.ni_dvp) 1922 vrele(nd.ni_dvp); 1923 else 1924 vput(nd.ni_dvp); 1925 if (nd.ni_vp) 1926 vrele(nd.ni_vp); 1927 return (EEXIST); 1928 } 1929 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1930 NDFREE_PNBUF(&nd); 1931 vput(nd.ni_dvp); 1932 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 1933 return (error); 1934 goto restart; 1935 } 1936 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1937 NDFREE_PNBUF(&nd); 1938 vput(nd.ni_dvp); 1939 vn_finished_write(mp); 1940 if (error == ERELOOKUP) 1941 goto restart; 1942 return (error); 1943 } 1944 1945 /* 1946 * Delete a name from the filesystem. 1947 */ 1948 #ifndef _SYS_SYSPROTO_H_ 1949 struct unlink_args { 1950 char *path; 1951 }; 1952 #endif 1953 int 1954 sys_unlink(struct thread *td, struct unlink_args *uap) 1955 { 1956 1957 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1958 0, 0)); 1959 } 1960 1961 static int 1962 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1963 int flag, enum uio_seg pathseg, ino_t oldinum) 1964 { 1965 1966 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0) 1967 return (EINVAL); 1968 1969 if ((flag & AT_REMOVEDIR) != 0) 1970 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1971 1972 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1973 } 1974 1975 #ifndef _SYS_SYSPROTO_H_ 1976 struct unlinkat_args { 1977 int fd; 1978 char *path; 1979 int flag; 1980 }; 1981 #endif 1982 int 1983 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1984 { 1985 1986 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1987 UIO_USERSPACE, 0)); 1988 } 1989 1990 #ifndef _SYS_SYSPROTO_H_ 1991 struct funlinkat_args { 1992 int dfd; 1993 const char *path; 1994 int fd; 1995 int flag; 1996 }; 1997 #endif 1998 int 1999 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 2000 { 2001 2002 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 2003 UIO_USERSPACE, 0)); 2004 } 2005 2006 int 2007 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 2008 enum uio_seg pathseg, int flag, ino_t oldinum) 2009 { 2010 struct mount *mp; 2011 struct file *fp; 2012 struct vnode *vp; 2013 struct nameidata nd; 2014 struct stat sb; 2015 int error; 2016 2017 fp = NULL; 2018 if (fd != FD_NONE) { 2019 error = getvnode_path(td, fd, &cap_no_rights, &fp); 2020 if (error != 0) 2021 return (error); 2022 } 2023 2024 NDPREINIT(&nd); 2025 restart: 2026 bwillwrite(); 2027 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 2028 at2cnpflags(flag, AT_RESOLVE_BENEATH), 2029 pathseg, path, dfd, &cap_unlinkat_rights); 2030 if ((error = namei(&nd)) != 0) { 2031 if (error == EINVAL) 2032 error = EPERM; 2033 goto fdout; 2034 } 2035 vp = nd.ni_vp; 2036 if (vp->v_type == VDIR && oldinum == 0) { 2037 error = EPERM; /* POSIX */ 2038 } else if (oldinum != 0 && 2039 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED)) == 0) && 2040 sb.st_ino != oldinum) { 2041 error = EIDRM; /* Identifier removed */ 2042 } else if (fp != NULL && fp->f_vnode != vp) { 2043 if (VN_IS_DOOMED(fp->f_vnode)) 2044 error = EBADF; 2045 else 2046 error = EDEADLK; 2047 } else { 2048 /* 2049 * The root of a mounted filesystem cannot be deleted. 2050 * 2051 * XXX: can this only be a VDIR case? 2052 */ 2053 if (vp->v_vflag & VV_ROOT) 2054 error = EBUSY; 2055 } 2056 if (error == 0) { 2057 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 2058 NDFREE_PNBUF(&nd); 2059 vput(nd.ni_dvp); 2060 if (vp == nd.ni_dvp) 2061 vrele(vp); 2062 else 2063 vput(vp); 2064 if ((error = vn_start_write(NULL, &mp, 2065 V_XSLEEP | V_PCATCH)) != 0) { 2066 goto fdout; 2067 } 2068 goto restart; 2069 } 2070 #ifdef MAC 2071 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 2072 &nd.ni_cnd); 2073 if (error != 0) 2074 goto out; 2075 #endif 2076 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 2077 #ifdef MAC 2078 out: 2079 #endif 2080 vn_finished_write(mp); 2081 } 2082 NDFREE_PNBUF(&nd); 2083 vput(nd.ni_dvp); 2084 if (vp == nd.ni_dvp) 2085 vrele(vp); 2086 else 2087 vput(vp); 2088 if (error == ERELOOKUP) 2089 goto restart; 2090 fdout: 2091 if (fp != NULL) 2092 fdrop(fp, td); 2093 return (error); 2094 } 2095 2096 /* 2097 * Reposition read/write file offset. 2098 */ 2099 #ifndef _SYS_SYSPROTO_H_ 2100 struct lseek_args { 2101 int fd; 2102 int pad; 2103 off_t offset; 2104 int whence; 2105 }; 2106 #endif 2107 int 2108 sys_lseek(struct thread *td, struct lseek_args *uap) 2109 { 2110 2111 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2112 } 2113 2114 int 2115 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 2116 { 2117 struct file *fp; 2118 int error; 2119 2120 AUDIT_ARG_FD(fd); 2121 error = fget(td, fd, &cap_seek_rights, &fp); 2122 if (error != 0) 2123 return (error); 2124 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 2125 fo_seek(fp, offset, whence, td) : ESPIPE; 2126 fdrop(fp, td); 2127 return (error); 2128 } 2129 2130 #if defined(COMPAT_43) 2131 /* 2132 * Reposition read/write file offset. 2133 */ 2134 #ifndef _SYS_SYSPROTO_H_ 2135 struct olseek_args { 2136 int fd; 2137 long offset; 2138 int whence; 2139 }; 2140 #endif 2141 int 2142 olseek(struct thread *td, struct olseek_args *uap) 2143 { 2144 2145 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2146 } 2147 #endif /* COMPAT_43 */ 2148 2149 #if defined(COMPAT_FREEBSD6) 2150 /* Version with the 'pad' argument */ 2151 int 2152 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 2153 { 2154 2155 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2156 } 2157 #endif 2158 2159 /* 2160 * Check access permissions using passed credentials. 2161 */ 2162 static int 2163 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 2164 struct thread *td) 2165 { 2166 accmode_t accmode; 2167 int error; 2168 2169 /* Flags == 0 means only check for existence. */ 2170 if (user_flags == 0) 2171 return (0); 2172 2173 accmode = 0; 2174 if (user_flags & R_OK) 2175 accmode |= VREAD; 2176 if (user_flags & W_OK) 2177 accmode |= VWRITE; 2178 if (user_flags & X_OK) 2179 accmode |= VEXEC; 2180 #ifdef MAC 2181 error = mac_vnode_check_access(cred, vp, accmode); 2182 if (error != 0) 2183 return (error); 2184 #endif 2185 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 2186 error = VOP_ACCESS(vp, accmode, cred, td); 2187 return (error); 2188 } 2189 2190 /* 2191 * Check access permissions using "real" credentials. 2192 */ 2193 #ifndef _SYS_SYSPROTO_H_ 2194 struct access_args { 2195 char *path; 2196 int amode; 2197 }; 2198 #endif 2199 int 2200 sys_access(struct thread *td, struct access_args *uap) 2201 { 2202 2203 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2204 0, uap->amode)); 2205 } 2206 2207 #ifndef _SYS_SYSPROTO_H_ 2208 struct faccessat_args { 2209 int dirfd; 2210 char *path; 2211 int amode; 2212 int flag; 2213 } 2214 #endif 2215 int 2216 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2217 { 2218 2219 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2220 uap->amode)); 2221 } 2222 2223 int 2224 kern_accessat(struct thread *td, int fd, const char *path, 2225 enum uio_seg pathseg, int flag, int amode) 2226 { 2227 struct ucred *cred, *usecred; 2228 struct vnode *vp; 2229 struct nameidata nd; 2230 int error; 2231 2232 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH | 2233 AT_SYMLINK_NOFOLLOW)) != 0) 2234 return (EINVAL); 2235 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2236 return (EINVAL); 2237 2238 /* 2239 * Create and modify a temporary credential instead of one that 2240 * is potentially shared (if we need one). 2241 */ 2242 cred = td->td_ucred; 2243 if ((flag & AT_EACCESS) == 0 && 2244 ((cred->cr_uid != cred->cr_ruid || 2245 cred->cr_rgid != cred->cr_groups[0]))) { 2246 usecred = crdup(cred); 2247 usecred->cr_uid = cred->cr_ruid; 2248 usecred->cr_groups[0] = cred->cr_rgid; 2249 td->td_ucred = usecred; 2250 } else 2251 usecred = cred; 2252 AUDIT_ARG_VALUE(amode); 2253 NDINIT_ATRIGHTS(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | 2254 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | AT_SYMLINK_NOFOLLOW | 2255 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights); 2256 if ((error = namei(&nd)) != 0) 2257 goto out; 2258 vp = nd.ni_vp; 2259 2260 error = vn_access(vp, amode, usecred, td); 2261 NDFREE_PNBUF(&nd); 2262 vput(vp); 2263 out: 2264 if (usecred != cred) { 2265 td->td_ucred = cred; 2266 crfree(usecred); 2267 } 2268 return (error); 2269 } 2270 2271 /* 2272 * Check access permissions using "effective" credentials. 2273 */ 2274 #ifndef _SYS_SYSPROTO_H_ 2275 struct eaccess_args { 2276 char *path; 2277 int amode; 2278 }; 2279 #endif 2280 int 2281 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2282 { 2283 2284 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2285 AT_EACCESS, uap->amode)); 2286 } 2287 2288 #if defined(COMPAT_43) 2289 /* 2290 * Get file status; this version follows links. 2291 */ 2292 #ifndef _SYS_SYSPROTO_H_ 2293 struct ostat_args { 2294 char *path; 2295 struct ostat *ub; 2296 }; 2297 #endif 2298 int 2299 ostat(struct thread *td, struct ostat_args *uap) 2300 { 2301 struct stat sb; 2302 struct ostat osb; 2303 int error; 2304 2305 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb); 2306 if (error != 0) 2307 return (error); 2308 cvtstat(&sb, &osb); 2309 return (copyout(&osb, uap->ub, sizeof (osb))); 2310 } 2311 2312 /* 2313 * Get file status; this version does not follow links. 2314 */ 2315 #ifndef _SYS_SYSPROTO_H_ 2316 struct olstat_args { 2317 char *path; 2318 struct ostat *ub; 2319 }; 2320 #endif 2321 int 2322 olstat(struct thread *td, struct olstat_args *uap) 2323 { 2324 struct stat sb; 2325 struct ostat osb; 2326 int error; 2327 2328 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2329 UIO_USERSPACE, &sb); 2330 if (error != 0) 2331 return (error); 2332 cvtstat(&sb, &osb); 2333 return (copyout(&osb, uap->ub, sizeof (osb))); 2334 } 2335 2336 /* 2337 * Convert from an old to a new stat structure. 2338 * XXX: many values are blindly truncated. 2339 */ 2340 void 2341 cvtstat(struct stat *st, struct ostat *ost) 2342 { 2343 2344 bzero(ost, sizeof(*ost)); 2345 ost->st_dev = st->st_dev; 2346 ost->st_ino = st->st_ino; 2347 ost->st_mode = st->st_mode; 2348 ost->st_nlink = st->st_nlink; 2349 ost->st_uid = st->st_uid; 2350 ost->st_gid = st->st_gid; 2351 ost->st_rdev = st->st_rdev; 2352 ost->st_size = MIN(st->st_size, INT32_MAX); 2353 ost->st_atim = st->st_atim; 2354 ost->st_mtim = st->st_mtim; 2355 ost->st_ctim = st->st_ctim; 2356 ost->st_blksize = st->st_blksize; 2357 ost->st_blocks = st->st_blocks; 2358 ost->st_flags = st->st_flags; 2359 ost->st_gen = st->st_gen; 2360 } 2361 #endif /* COMPAT_43 */ 2362 2363 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2364 int ino64_trunc_error; 2365 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2366 &ino64_trunc_error, 0, 2367 "Error on truncation of device, file or inode number, or link count"); 2368 2369 int 2370 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2371 { 2372 2373 ost->st_dev = st->st_dev; 2374 if (ost->st_dev != st->st_dev) { 2375 switch (ino64_trunc_error) { 2376 default: 2377 /* 2378 * Since dev_t is almost raw, don't clamp to the 2379 * maximum for case 2, but ignore the error. 2380 */ 2381 break; 2382 case 1: 2383 return (EOVERFLOW); 2384 } 2385 } 2386 ost->st_ino = st->st_ino; 2387 if (ost->st_ino != st->st_ino) { 2388 switch (ino64_trunc_error) { 2389 default: 2390 case 0: 2391 break; 2392 case 1: 2393 return (EOVERFLOW); 2394 case 2: 2395 ost->st_ino = UINT32_MAX; 2396 break; 2397 } 2398 } 2399 ost->st_mode = st->st_mode; 2400 ost->st_nlink = st->st_nlink; 2401 if (ost->st_nlink != st->st_nlink) { 2402 switch (ino64_trunc_error) { 2403 default: 2404 case 0: 2405 break; 2406 case 1: 2407 return (EOVERFLOW); 2408 case 2: 2409 ost->st_nlink = UINT16_MAX; 2410 break; 2411 } 2412 } 2413 ost->st_uid = st->st_uid; 2414 ost->st_gid = st->st_gid; 2415 ost->st_rdev = st->st_rdev; 2416 if (ost->st_rdev != st->st_rdev) { 2417 switch (ino64_trunc_error) { 2418 default: 2419 break; 2420 case 1: 2421 return (EOVERFLOW); 2422 } 2423 } 2424 ost->st_atim = st->st_atim; 2425 ost->st_mtim = st->st_mtim; 2426 ost->st_ctim = st->st_ctim; 2427 ost->st_size = st->st_size; 2428 ost->st_blocks = st->st_blocks; 2429 ost->st_blksize = st->st_blksize; 2430 ost->st_flags = st->st_flags; 2431 ost->st_gen = st->st_gen; 2432 ost->st_lspare = 0; 2433 ost->st_birthtim = st->st_birthtim; 2434 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2435 sizeof(*ost) - offsetof(struct freebsd11_stat, 2436 st_birthtim) - sizeof(ost->st_birthtim)); 2437 return (0); 2438 } 2439 2440 int 2441 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2442 { 2443 struct stat sb; 2444 struct freebsd11_stat osb; 2445 int error; 2446 2447 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb); 2448 if (error != 0) 2449 return (error); 2450 error = freebsd11_cvtstat(&sb, &osb); 2451 if (error == 0) 2452 error = copyout(&osb, uap->ub, sizeof(osb)); 2453 return (error); 2454 } 2455 2456 int 2457 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2458 { 2459 struct stat sb; 2460 struct freebsd11_stat osb; 2461 int error; 2462 2463 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2464 UIO_USERSPACE, &sb); 2465 if (error != 0) 2466 return (error); 2467 error = freebsd11_cvtstat(&sb, &osb); 2468 if (error == 0) 2469 error = copyout(&osb, uap->ub, sizeof(osb)); 2470 return (error); 2471 } 2472 2473 int 2474 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2475 { 2476 struct fhandle fh; 2477 struct stat sb; 2478 struct freebsd11_stat osb; 2479 int error; 2480 2481 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2482 if (error != 0) 2483 return (error); 2484 error = kern_fhstat(td, fh, &sb); 2485 if (error != 0) 2486 return (error); 2487 error = freebsd11_cvtstat(&sb, &osb); 2488 if (error == 0) 2489 error = copyout(&osb, uap->sb, sizeof(osb)); 2490 return (error); 2491 } 2492 2493 int 2494 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2495 { 2496 struct stat sb; 2497 struct freebsd11_stat osb; 2498 int error; 2499 2500 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2501 UIO_USERSPACE, &sb); 2502 if (error != 0) 2503 return (error); 2504 error = freebsd11_cvtstat(&sb, &osb); 2505 if (error == 0) 2506 error = copyout(&osb, uap->buf, sizeof(osb)); 2507 return (error); 2508 } 2509 #endif /* COMPAT_FREEBSD11 */ 2510 2511 /* 2512 * Get file status 2513 */ 2514 #ifndef _SYS_SYSPROTO_H_ 2515 struct fstatat_args { 2516 int fd; 2517 char *path; 2518 struct stat *buf; 2519 int flag; 2520 } 2521 #endif 2522 int 2523 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2524 { 2525 struct stat sb; 2526 int error; 2527 2528 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2529 UIO_USERSPACE, &sb); 2530 if (error == 0) 2531 error = copyout(&sb, uap->buf, sizeof (sb)); 2532 return (error); 2533 } 2534 2535 int 2536 kern_statat(struct thread *td, int flag, int fd, const char *path, 2537 enum uio_seg pathseg, struct stat *sbp) 2538 { 2539 struct nameidata nd; 2540 int error; 2541 2542 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2543 AT_EMPTY_PATH)) != 0) 2544 return (EINVAL); 2545 2546 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH | 2547 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF | 2548 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights); 2549 2550 if ((error = namei(&nd)) != 0) { 2551 if (error == ENOTDIR && 2552 (nd.ni_resflags & NIRES_EMPTYPATH) != 0) 2553 error = kern_fstat(td, fd, sbp); 2554 return (error); 2555 } 2556 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED); 2557 NDFREE_PNBUF(&nd); 2558 vput(nd.ni_vp); 2559 #ifdef __STAT_TIME_T_EXT 2560 sbp->st_atim_ext = 0; 2561 sbp->st_mtim_ext = 0; 2562 sbp->st_ctim_ext = 0; 2563 sbp->st_btim_ext = 0; 2564 #endif 2565 #ifdef KTRACE 2566 if (KTRPOINT(td, KTR_STRUCT)) 2567 ktrstat_error(sbp, error); 2568 #endif 2569 return (error); 2570 } 2571 2572 #if defined(COMPAT_FREEBSD11) 2573 /* 2574 * Implementation of the NetBSD [l]stat() functions. 2575 */ 2576 int 2577 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2578 { 2579 struct freebsd11_stat sb11; 2580 int error; 2581 2582 error = freebsd11_cvtstat(sb, &sb11); 2583 if (error != 0) 2584 return (error); 2585 2586 bzero(nsb, sizeof(*nsb)); 2587 CP(sb11, *nsb, st_dev); 2588 CP(sb11, *nsb, st_ino); 2589 CP(sb11, *nsb, st_mode); 2590 CP(sb11, *nsb, st_nlink); 2591 CP(sb11, *nsb, st_uid); 2592 CP(sb11, *nsb, st_gid); 2593 CP(sb11, *nsb, st_rdev); 2594 CP(sb11, *nsb, st_atim); 2595 CP(sb11, *nsb, st_mtim); 2596 CP(sb11, *nsb, st_ctim); 2597 CP(sb11, *nsb, st_size); 2598 CP(sb11, *nsb, st_blocks); 2599 CP(sb11, *nsb, st_blksize); 2600 CP(sb11, *nsb, st_flags); 2601 CP(sb11, *nsb, st_gen); 2602 CP(sb11, *nsb, st_birthtim); 2603 return (0); 2604 } 2605 2606 #ifndef _SYS_SYSPROTO_H_ 2607 struct freebsd11_nstat_args { 2608 char *path; 2609 struct nstat *ub; 2610 }; 2611 #endif 2612 int 2613 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2614 { 2615 struct stat sb; 2616 struct nstat nsb; 2617 int error; 2618 2619 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb); 2620 if (error != 0) 2621 return (error); 2622 error = freebsd11_cvtnstat(&sb, &nsb); 2623 if (error == 0) 2624 error = copyout(&nsb, uap->ub, sizeof (nsb)); 2625 return (error); 2626 } 2627 2628 /* 2629 * NetBSD lstat. Get file status; this version does not follow links. 2630 */ 2631 #ifndef _SYS_SYSPROTO_H_ 2632 struct freebsd11_nlstat_args { 2633 char *path; 2634 struct nstat *ub; 2635 }; 2636 #endif 2637 int 2638 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2639 { 2640 struct stat sb; 2641 struct nstat nsb; 2642 int error; 2643 2644 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2645 UIO_USERSPACE, &sb); 2646 if (error != 0) 2647 return (error); 2648 error = freebsd11_cvtnstat(&sb, &nsb); 2649 if (error == 0) 2650 error = copyout(&nsb, uap->ub, sizeof (nsb)); 2651 return (error); 2652 } 2653 #endif /* COMPAT_FREEBSD11 */ 2654 2655 /* 2656 * Get configurable pathname variables. 2657 */ 2658 #ifndef _SYS_SYSPROTO_H_ 2659 struct pathconf_args { 2660 char *path; 2661 int name; 2662 }; 2663 #endif 2664 int 2665 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2666 { 2667 long value; 2668 int error; 2669 2670 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2671 &value); 2672 if (error == 0) 2673 td->td_retval[0] = value; 2674 return (error); 2675 } 2676 2677 #ifndef _SYS_SYSPROTO_H_ 2678 struct lpathconf_args { 2679 char *path; 2680 int name; 2681 }; 2682 #endif 2683 int 2684 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2685 { 2686 long value; 2687 int error; 2688 2689 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2690 NOFOLLOW, &value); 2691 if (error == 0) 2692 td->td_retval[0] = value; 2693 return (error); 2694 } 2695 2696 int 2697 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2698 int name, u_long flags, long *valuep) 2699 { 2700 struct nameidata nd; 2701 int error; 2702 2703 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2704 pathseg, path); 2705 if ((error = namei(&nd)) != 0) 2706 return (error); 2707 NDFREE_PNBUF(&nd); 2708 2709 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2710 vput(nd.ni_vp); 2711 return (error); 2712 } 2713 2714 /* 2715 * Return target name of a symbolic link. 2716 */ 2717 #ifndef _SYS_SYSPROTO_H_ 2718 struct readlink_args { 2719 char *path; 2720 char *buf; 2721 size_t count; 2722 }; 2723 #endif 2724 int 2725 sys_readlink(struct thread *td, struct readlink_args *uap) 2726 { 2727 2728 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2729 uap->buf, UIO_USERSPACE, uap->count)); 2730 } 2731 #ifndef _SYS_SYSPROTO_H_ 2732 struct readlinkat_args { 2733 int fd; 2734 char *path; 2735 char *buf; 2736 size_t bufsize; 2737 }; 2738 #endif 2739 int 2740 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2741 { 2742 2743 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2744 uap->buf, UIO_USERSPACE, uap->bufsize)); 2745 } 2746 2747 int 2748 kern_readlinkat(struct thread *td, int fd, const char *path, 2749 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2750 { 2751 struct vnode *vp; 2752 struct nameidata nd; 2753 int error; 2754 2755 if (count > IOSIZE_MAX) 2756 return (EINVAL); 2757 2758 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | 2759 EMPTYPATH, pathseg, path, fd); 2760 2761 if ((error = namei(&nd)) != 0) 2762 return (error); 2763 NDFREE_PNBUF(&nd); 2764 vp = nd.ni_vp; 2765 2766 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2767 vput(vp); 2768 2769 return (error); 2770 } 2771 2772 /* 2773 * Helper function to readlink from a vnode 2774 */ 2775 static int 2776 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2777 struct thread *td) 2778 { 2779 struct iovec aiov; 2780 struct uio auio; 2781 int error; 2782 2783 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2784 #ifdef MAC 2785 error = mac_vnode_check_readlink(td->td_ucred, vp); 2786 if (error != 0) 2787 return (error); 2788 #endif 2789 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2790 return (EINVAL); 2791 2792 aiov.iov_base = buf; 2793 aiov.iov_len = count; 2794 auio.uio_iov = &aiov; 2795 auio.uio_iovcnt = 1; 2796 auio.uio_offset = 0; 2797 auio.uio_rw = UIO_READ; 2798 auio.uio_segflg = bufseg; 2799 auio.uio_td = td; 2800 auio.uio_resid = count; 2801 error = VOP_READLINK(vp, &auio, td->td_ucred); 2802 td->td_retval[0] = count - auio.uio_resid; 2803 return (error); 2804 } 2805 2806 /* 2807 * Common implementation code for chflags() and fchflags(). 2808 */ 2809 static int 2810 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2811 { 2812 struct mount *mp; 2813 struct vattr vattr; 2814 int error; 2815 2816 /* We can't support the value matching VNOVAL. */ 2817 if (flags == VNOVAL) 2818 return (EOPNOTSUPP); 2819 2820 /* 2821 * Prevent non-root users from setting flags on devices. When 2822 * a device is reused, users can retain ownership of the device 2823 * if they are allowed to set flags and programs assume that 2824 * chown can't fail when done as root. 2825 */ 2826 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2827 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2828 if (error != 0) 2829 return (error); 2830 } 2831 2832 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2833 return (error); 2834 VATTR_NULL(&vattr); 2835 vattr.va_flags = flags; 2836 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2837 #ifdef MAC 2838 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2839 if (error == 0) 2840 #endif 2841 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2842 VOP_UNLOCK(vp); 2843 vn_finished_write(mp); 2844 return (error); 2845 } 2846 2847 /* 2848 * Change flags of a file given a path name. 2849 */ 2850 #ifndef _SYS_SYSPROTO_H_ 2851 struct chflags_args { 2852 const char *path; 2853 u_long flags; 2854 }; 2855 #endif 2856 int 2857 sys_chflags(struct thread *td, struct chflags_args *uap) 2858 { 2859 2860 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2861 uap->flags, 0)); 2862 } 2863 2864 #ifndef _SYS_SYSPROTO_H_ 2865 struct chflagsat_args { 2866 int fd; 2867 const char *path; 2868 u_long flags; 2869 int atflag; 2870 } 2871 #endif 2872 int 2873 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2874 { 2875 2876 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2877 uap->flags, uap->atflag)); 2878 } 2879 2880 /* 2881 * Same as chflags() but doesn't follow symlinks. 2882 */ 2883 #ifndef _SYS_SYSPROTO_H_ 2884 struct lchflags_args { 2885 const char *path; 2886 u_long flags; 2887 }; 2888 #endif 2889 int 2890 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2891 { 2892 2893 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2894 uap->flags, AT_SYMLINK_NOFOLLOW)); 2895 } 2896 2897 static int 2898 kern_chflagsat(struct thread *td, int fd, const char *path, 2899 enum uio_seg pathseg, u_long flags, int atflag) 2900 { 2901 struct nameidata nd; 2902 int error; 2903 2904 if ((atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2905 AT_EMPTY_PATH)) != 0) 2906 return (EINVAL); 2907 2908 AUDIT_ARG_FFLAGS(flags); 2909 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW | 2910 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2911 fd, &cap_fchflags_rights); 2912 if ((error = namei(&nd)) != 0) 2913 return (error); 2914 NDFREE_PNBUF(&nd); 2915 error = setfflags(td, nd.ni_vp, flags); 2916 vrele(nd.ni_vp); 2917 return (error); 2918 } 2919 2920 /* 2921 * Change flags of a file given a file descriptor. 2922 */ 2923 #ifndef _SYS_SYSPROTO_H_ 2924 struct fchflags_args { 2925 int fd; 2926 u_long flags; 2927 }; 2928 #endif 2929 int 2930 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2931 { 2932 struct file *fp; 2933 int error; 2934 2935 AUDIT_ARG_FD(uap->fd); 2936 AUDIT_ARG_FFLAGS(uap->flags); 2937 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2938 &fp); 2939 if (error != 0) 2940 return (error); 2941 #ifdef AUDIT 2942 if (AUDITING_TD(td)) { 2943 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2944 AUDIT_ARG_VNODE1(fp->f_vnode); 2945 VOP_UNLOCK(fp->f_vnode); 2946 } 2947 #endif 2948 error = setfflags(td, fp->f_vnode, uap->flags); 2949 fdrop(fp, td); 2950 return (error); 2951 } 2952 2953 /* 2954 * Common implementation code for chmod(), lchmod() and fchmod(). 2955 */ 2956 int 2957 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2958 { 2959 struct mount *mp; 2960 struct vattr vattr; 2961 int error; 2962 2963 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2964 return (error); 2965 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2966 VATTR_NULL(&vattr); 2967 vattr.va_mode = mode & ALLPERMS; 2968 #ifdef MAC 2969 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2970 if (error == 0) 2971 #endif 2972 error = VOP_SETATTR(vp, &vattr, cred); 2973 VOP_UNLOCK(vp); 2974 vn_finished_write(mp); 2975 return (error); 2976 } 2977 2978 /* 2979 * Change mode of a file given path name. 2980 */ 2981 #ifndef _SYS_SYSPROTO_H_ 2982 struct chmod_args { 2983 char *path; 2984 int mode; 2985 }; 2986 #endif 2987 int 2988 sys_chmod(struct thread *td, struct chmod_args *uap) 2989 { 2990 2991 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2992 uap->mode, 0)); 2993 } 2994 2995 #ifndef _SYS_SYSPROTO_H_ 2996 struct fchmodat_args { 2997 int dirfd; 2998 char *path; 2999 mode_t mode; 3000 int flag; 3001 } 3002 #endif 3003 int 3004 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 3005 { 3006 3007 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 3008 uap->mode, uap->flag)); 3009 } 3010 3011 /* 3012 * Change mode of a file given path name (don't follow links.) 3013 */ 3014 #ifndef _SYS_SYSPROTO_H_ 3015 struct lchmod_args { 3016 char *path; 3017 int mode; 3018 }; 3019 #endif 3020 int 3021 sys_lchmod(struct thread *td, struct lchmod_args *uap) 3022 { 3023 3024 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3025 uap->mode, AT_SYMLINK_NOFOLLOW)); 3026 } 3027 3028 int 3029 kern_fchmodat(struct thread *td, int fd, const char *path, 3030 enum uio_seg pathseg, mode_t mode, int flag) 3031 { 3032 struct nameidata nd; 3033 int error; 3034 3035 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3036 AT_EMPTY_PATH)) != 0) 3037 return (EINVAL); 3038 3039 AUDIT_ARG_MODE(mode); 3040 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3041 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3042 fd, &cap_fchmod_rights); 3043 if ((error = namei(&nd)) != 0) 3044 return (error); 3045 NDFREE_PNBUF(&nd); 3046 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 3047 vrele(nd.ni_vp); 3048 return (error); 3049 } 3050 3051 /* 3052 * Change mode of a file given a file descriptor. 3053 */ 3054 #ifndef _SYS_SYSPROTO_H_ 3055 struct fchmod_args { 3056 int fd; 3057 int mode; 3058 }; 3059 #endif 3060 int 3061 sys_fchmod(struct thread *td, struct fchmod_args *uap) 3062 { 3063 struct file *fp; 3064 int error; 3065 3066 AUDIT_ARG_FD(uap->fd); 3067 AUDIT_ARG_MODE(uap->mode); 3068 3069 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 3070 if (error != 0) 3071 return (error); 3072 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 3073 fdrop(fp, td); 3074 return (error); 3075 } 3076 3077 /* 3078 * Common implementation for chown(), lchown(), and fchown() 3079 */ 3080 int 3081 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 3082 gid_t gid) 3083 { 3084 struct mount *mp; 3085 struct vattr vattr; 3086 int error; 3087 3088 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3089 return (error); 3090 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3091 VATTR_NULL(&vattr); 3092 vattr.va_uid = uid; 3093 vattr.va_gid = gid; 3094 #ifdef MAC 3095 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 3096 vattr.va_gid); 3097 if (error == 0) 3098 #endif 3099 error = VOP_SETATTR(vp, &vattr, cred); 3100 VOP_UNLOCK(vp); 3101 vn_finished_write(mp); 3102 return (error); 3103 } 3104 3105 /* 3106 * Set ownership given a path name. 3107 */ 3108 #ifndef _SYS_SYSPROTO_H_ 3109 struct chown_args { 3110 char *path; 3111 int uid; 3112 int gid; 3113 }; 3114 #endif 3115 int 3116 sys_chown(struct thread *td, struct chown_args *uap) 3117 { 3118 3119 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 3120 uap->gid, 0)); 3121 } 3122 3123 #ifndef _SYS_SYSPROTO_H_ 3124 struct fchownat_args { 3125 int fd; 3126 const char * path; 3127 uid_t uid; 3128 gid_t gid; 3129 int flag; 3130 }; 3131 #endif 3132 int 3133 sys_fchownat(struct thread *td, struct fchownat_args *uap) 3134 { 3135 3136 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 3137 uap->gid, uap->flag)); 3138 } 3139 3140 int 3141 kern_fchownat(struct thread *td, int fd, const char *path, 3142 enum uio_seg pathseg, int uid, int gid, int flag) 3143 { 3144 struct nameidata nd; 3145 int error; 3146 3147 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3148 AT_EMPTY_PATH)) != 0) 3149 return (EINVAL); 3150 3151 AUDIT_ARG_OWNER(uid, gid); 3152 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3153 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3154 fd, &cap_fchown_rights); 3155 3156 if ((error = namei(&nd)) != 0) 3157 return (error); 3158 NDFREE_PNBUF(&nd); 3159 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 3160 vrele(nd.ni_vp); 3161 return (error); 3162 } 3163 3164 /* 3165 * Set ownership given a path name, do not cross symlinks. 3166 */ 3167 #ifndef _SYS_SYSPROTO_H_ 3168 struct lchown_args { 3169 char *path; 3170 int uid; 3171 int gid; 3172 }; 3173 #endif 3174 int 3175 sys_lchown(struct thread *td, struct lchown_args *uap) 3176 { 3177 3178 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3179 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 3180 } 3181 3182 /* 3183 * Set ownership given a file descriptor. 3184 */ 3185 #ifndef _SYS_SYSPROTO_H_ 3186 struct fchown_args { 3187 int fd; 3188 int uid; 3189 int gid; 3190 }; 3191 #endif 3192 int 3193 sys_fchown(struct thread *td, struct fchown_args *uap) 3194 { 3195 struct file *fp; 3196 int error; 3197 3198 AUDIT_ARG_FD(uap->fd); 3199 AUDIT_ARG_OWNER(uap->uid, uap->gid); 3200 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 3201 if (error != 0) 3202 return (error); 3203 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 3204 fdrop(fp, td); 3205 return (error); 3206 } 3207 3208 /* 3209 * Common implementation code for utimes(), lutimes(), and futimes(). 3210 */ 3211 static int 3212 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 3213 struct timespec *tsp) 3214 { 3215 struct timeval tv[2]; 3216 const struct timeval *tvp; 3217 int error; 3218 3219 if (usrtvp == NULL) { 3220 vfs_timestamp(&tsp[0]); 3221 tsp[1] = tsp[0]; 3222 } else { 3223 if (tvpseg == UIO_SYSSPACE) { 3224 tvp = usrtvp; 3225 } else { 3226 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3227 return (error); 3228 tvp = tv; 3229 } 3230 3231 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3232 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3233 return (EINVAL); 3234 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3235 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3236 } 3237 return (0); 3238 } 3239 3240 /* 3241 * Common implementation code for futimens(), utimensat(). 3242 */ 3243 #define UTIMENS_NULL 0x1 3244 #define UTIMENS_EXIT 0x2 3245 static int 3246 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3247 struct timespec *tsp, int *retflags) 3248 { 3249 struct timespec tsnow; 3250 int error; 3251 3252 vfs_timestamp(&tsnow); 3253 *retflags = 0; 3254 if (usrtsp == NULL) { 3255 tsp[0] = tsnow; 3256 tsp[1] = tsnow; 3257 *retflags |= UTIMENS_NULL; 3258 return (0); 3259 } 3260 if (tspseg == UIO_SYSSPACE) { 3261 tsp[0] = usrtsp[0]; 3262 tsp[1] = usrtsp[1]; 3263 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3264 return (error); 3265 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3266 *retflags |= UTIMENS_EXIT; 3267 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3268 *retflags |= UTIMENS_NULL; 3269 if (tsp[0].tv_nsec == UTIME_OMIT) 3270 tsp[0].tv_sec = VNOVAL; 3271 else if (tsp[0].tv_nsec == UTIME_NOW) 3272 tsp[0] = tsnow; 3273 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3274 return (EINVAL); 3275 if (tsp[1].tv_nsec == UTIME_OMIT) 3276 tsp[1].tv_sec = VNOVAL; 3277 else if (tsp[1].tv_nsec == UTIME_NOW) 3278 tsp[1] = tsnow; 3279 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3280 return (EINVAL); 3281 3282 return (0); 3283 } 3284 3285 /* 3286 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3287 * and utimensat(). 3288 */ 3289 static int 3290 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3291 int numtimes, int nullflag) 3292 { 3293 struct mount *mp; 3294 struct vattr vattr; 3295 int error; 3296 bool setbirthtime; 3297 3298 setbirthtime = false; 3299 vattr.va_birthtime.tv_sec = VNOVAL; 3300 vattr.va_birthtime.tv_nsec = 0; 3301 3302 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3303 return (error); 3304 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3305 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred) == 0 && 3306 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3307 setbirthtime = true; 3308 VATTR_NULL(&vattr); 3309 vattr.va_atime = ts[0]; 3310 vattr.va_mtime = ts[1]; 3311 if (setbirthtime) 3312 vattr.va_birthtime = ts[1]; 3313 if (numtimes > 2) 3314 vattr.va_birthtime = ts[2]; 3315 if (nullflag) 3316 vattr.va_vaflags |= VA_UTIMES_NULL; 3317 #ifdef MAC 3318 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3319 vattr.va_mtime); 3320 #endif 3321 if (error == 0) 3322 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3323 VOP_UNLOCK(vp); 3324 vn_finished_write(mp); 3325 return (error); 3326 } 3327 3328 /* 3329 * Set the access and modification times of a file. 3330 */ 3331 #ifndef _SYS_SYSPROTO_H_ 3332 struct utimes_args { 3333 char *path; 3334 struct timeval *tptr; 3335 }; 3336 #endif 3337 int 3338 sys_utimes(struct thread *td, struct utimes_args *uap) 3339 { 3340 3341 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3342 uap->tptr, UIO_USERSPACE)); 3343 } 3344 3345 #ifndef _SYS_SYSPROTO_H_ 3346 struct futimesat_args { 3347 int fd; 3348 const char * path; 3349 const struct timeval * times; 3350 }; 3351 #endif 3352 int 3353 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3354 { 3355 3356 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3357 uap->times, UIO_USERSPACE)); 3358 } 3359 3360 int 3361 kern_utimesat(struct thread *td, int fd, const char *path, 3362 enum uio_seg pathseg, const struct timeval *tptr, enum uio_seg tptrseg) 3363 { 3364 struct nameidata nd; 3365 struct timespec ts[2]; 3366 int error; 3367 3368 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3369 return (error); 3370 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3371 &cap_futimes_rights); 3372 3373 if ((error = namei(&nd)) != 0) 3374 return (error); 3375 NDFREE_PNBUF(&nd); 3376 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3377 vrele(nd.ni_vp); 3378 return (error); 3379 } 3380 3381 /* 3382 * Set the access and modification times of a file. 3383 */ 3384 #ifndef _SYS_SYSPROTO_H_ 3385 struct lutimes_args { 3386 char *path; 3387 struct timeval *tptr; 3388 }; 3389 #endif 3390 int 3391 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3392 { 3393 3394 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3395 UIO_USERSPACE)); 3396 } 3397 3398 int 3399 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3400 const struct timeval *tptr, enum uio_seg tptrseg) 3401 { 3402 struct timespec ts[2]; 3403 struct nameidata nd; 3404 int error; 3405 3406 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3407 return (error); 3408 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path); 3409 if ((error = namei(&nd)) != 0) 3410 return (error); 3411 NDFREE_PNBUF(&nd); 3412 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3413 vrele(nd.ni_vp); 3414 return (error); 3415 } 3416 3417 /* 3418 * Set the access and modification times of a file. 3419 */ 3420 #ifndef _SYS_SYSPROTO_H_ 3421 struct futimes_args { 3422 int fd; 3423 struct timeval *tptr; 3424 }; 3425 #endif 3426 int 3427 sys_futimes(struct thread *td, struct futimes_args *uap) 3428 { 3429 3430 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3431 } 3432 3433 int 3434 kern_futimes(struct thread *td, int fd, const struct timeval *tptr, 3435 enum uio_seg tptrseg) 3436 { 3437 struct timespec ts[2]; 3438 struct file *fp; 3439 int error; 3440 3441 AUDIT_ARG_FD(fd); 3442 error = getutimes(tptr, tptrseg, ts); 3443 if (error != 0) 3444 return (error); 3445 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3446 if (error != 0) 3447 return (error); 3448 #ifdef AUDIT 3449 if (AUDITING_TD(td)) { 3450 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3451 AUDIT_ARG_VNODE1(fp->f_vnode); 3452 VOP_UNLOCK(fp->f_vnode); 3453 } 3454 #endif 3455 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3456 fdrop(fp, td); 3457 return (error); 3458 } 3459 3460 int 3461 sys_futimens(struct thread *td, struct futimens_args *uap) 3462 { 3463 3464 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3465 } 3466 3467 int 3468 kern_futimens(struct thread *td, int fd, const struct timespec *tptr, 3469 enum uio_seg tptrseg) 3470 { 3471 struct timespec ts[2]; 3472 struct file *fp; 3473 int error, flags; 3474 3475 AUDIT_ARG_FD(fd); 3476 error = getutimens(tptr, tptrseg, ts, &flags); 3477 if (error != 0) 3478 return (error); 3479 if (flags & UTIMENS_EXIT) 3480 return (0); 3481 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3482 if (error != 0) 3483 return (error); 3484 #ifdef AUDIT 3485 if (AUDITING_TD(td)) { 3486 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3487 AUDIT_ARG_VNODE1(fp->f_vnode); 3488 VOP_UNLOCK(fp->f_vnode); 3489 } 3490 #endif 3491 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3492 fdrop(fp, td); 3493 return (error); 3494 } 3495 3496 int 3497 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3498 { 3499 3500 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3501 uap->times, UIO_USERSPACE, uap->flag)); 3502 } 3503 3504 int 3505 kern_utimensat(struct thread *td, int fd, const char *path, 3506 enum uio_seg pathseg, const struct timespec *tptr, enum uio_seg tptrseg, 3507 int flag) 3508 { 3509 struct nameidata nd; 3510 struct timespec ts[2]; 3511 int error, flags; 3512 3513 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3514 AT_EMPTY_PATH)) != 0) 3515 return (EINVAL); 3516 3517 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3518 return (error); 3519 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3520 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, 3521 pathseg, path, fd, &cap_futimes_rights); 3522 if ((error = namei(&nd)) != 0) 3523 return (error); 3524 /* 3525 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3526 * POSIX states: 3527 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3528 * "Search permission is denied by a component of the path prefix." 3529 */ 3530 NDFREE_PNBUF(&nd); 3531 if ((flags & UTIMENS_EXIT) == 0) 3532 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3533 vrele(nd.ni_vp); 3534 return (error); 3535 } 3536 3537 /* 3538 * Truncate a file given its path name. 3539 */ 3540 #ifndef _SYS_SYSPROTO_H_ 3541 struct truncate_args { 3542 char *path; 3543 int pad; 3544 off_t length; 3545 }; 3546 #endif 3547 int 3548 sys_truncate(struct thread *td, struct truncate_args *uap) 3549 { 3550 3551 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3552 } 3553 3554 int 3555 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3556 off_t length) 3557 { 3558 struct mount *mp; 3559 struct vnode *vp; 3560 void *rl_cookie; 3561 struct nameidata nd; 3562 int error; 3563 3564 if (length < 0) 3565 return (EINVAL); 3566 NDPREINIT(&nd); 3567 retry: 3568 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path); 3569 if ((error = namei(&nd)) != 0) 3570 return (error); 3571 vp = nd.ni_vp; 3572 NDFREE_PNBUF(&nd); 3573 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3574 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3575 vn_rangelock_unlock(vp, rl_cookie); 3576 vrele(vp); 3577 return (error); 3578 } 3579 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3580 if (vp->v_type == VDIR) { 3581 error = EISDIR; 3582 goto out; 3583 } 3584 #ifdef MAC 3585 error = mac_vnode_check_write(td->td_ucred, NOCRED, vp); 3586 if (error != 0) 3587 goto out; 3588 #endif 3589 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td); 3590 if (error != 0) 3591 goto out; 3592 3593 error = vn_truncate_locked(vp, length, false, td->td_ucred); 3594 out: 3595 VOP_UNLOCK(vp); 3596 vn_finished_write(mp); 3597 vn_rangelock_unlock(vp, rl_cookie); 3598 vrele(vp); 3599 if (error == ERELOOKUP) 3600 goto retry; 3601 return (error); 3602 } 3603 3604 #if defined(COMPAT_43) 3605 /* 3606 * Truncate a file given its path name. 3607 */ 3608 #ifndef _SYS_SYSPROTO_H_ 3609 struct otruncate_args { 3610 char *path; 3611 long length; 3612 }; 3613 #endif 3614 int 3615 otruncate(struct thread *td, struct otruncate_args *uap) 3616 { 3617 3618 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3619 } 3620 #endif /* COMPAT_43 */ 3621 3622 #if defined(COMPAT_FREEBSD6) 3623 /* Versions with the pad argument */ 3624 int 3625 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3626 { 3627 3628 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3629 } 3630 3631 int 3632 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3633 { 3634 3635 return (kern_ftruncate(td, uap->fd, uap->length)); 3636 } 3637 #endif 3638 3639 int 3640 kern_fsync(struct thread *td, int fd, bool fullsync) 3641 { 3642 struct vnode *vp; 3643 struct mount *mp; 3644 struct file *fp; 3645 int error; 3646 3647 AUDIT_ARG_FD(fd); 3648 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3649 if (error != 0) 3650 return (error); 3651 vp = fp->f_vnode; 3652 #if 0 3653 if (!fullsync) 3654 /* XXXKIB: compete outstanding aio writes */; 3655 #endif 3656 retry: 3657 error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH); 3658 if (error != 0) 3659 goto drop; 3660 vn_lock(vp, vn_lktype_write(mp, vp) | LK_RETRY); 3661 AUDIT_ARG_VNODE1(vp); 3662 vnode_pager_clean_async(vp); 3663 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3664 VOP_UNLOCK(vp); 3665 vn_finished_write(mp); 3666 if (error == ERELOOKUP) 3667 goto retry; 3668 drop: 3669 fdrop(fp, td); 3670 return (error); 3671 } 3672 3673 /* 3674 * Sync an open file. 3675 */ 3676 #ifndef _SYS_SYSPROTO_H_ 3677 struct fsync_args { 3678 int fd; 3679 }; 3680 #endif 3681 int 3682 sys_fsync(struct thread *td, struct fsync_args *uap) 3683 { 3684 3685 return (kern_fsync(td, uap->fd, true)); 3686 } 3687 3688 int 3689 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3690 { 3691 3692 return (kern_fsync(td, uap->fd, false)); 3693 } 3694 3695 /* 3696 * Rename files. Source and destination must either both be directories, or 3697 * both not be directories. If target is a directory, it must be empty. 3698 */ 3699 #ifndef _SYS_SYSPROTO_H_ 3700 struct rename_args { 3701 char *from; 3702 char *to; 3703 }; 3704 #endif 3705 int 3706 sys_rename(struct thread *td, struct rename_args *uap) 3707 { 3708 3709 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3710 uap->to, UIO_USERSPACE)); 3711 } 3712 3713 #ifndef _SYS_SYSPROTO_H_ 3714 struct renameat_args { 3715 int oldfd; 3716 char *old; 3717 int newfd; 3718 char *new; 3719 }; 3720 #endif 3721 int 3722 sys_renameat(struct thread *td, struct renameat_args *uap) 3723 { 3724 3725 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3726 UIO_USERSPACE)); 3727 } 3728 3729 #ifdef MAC 3730 static int 3731 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd, 3732 const char *new, enum uio_seg pathseg, struct nameidata *fromnd) 3733 { 3734 int error; 3735 3736 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, 3737 pathseg, old, oldfd, &cap_renameat_source_rights); 3738 if ((error = namei(fromnd)) != 0) 3739 return (error); 3740 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp, 3741 fromnd->ni_vp, &fromnd->ni_cnd); 3742 VOP_UNLOCK(fromnd->ni_dvp); 3743 if (fromnd->ni_dvp != fromnd->ni_vp) 3744 VOP_UNLOCK(fromnd->ni_vp); 3745 if (error != 0) { 3746 NDFREE_PNBUF(fromnd); 3747 vrele(fromnd->ni_dvp); 3748 vrele(fromnd->ni_vp); 3749 } 3750 return (error); 3751 } 3752 #endif 3753 3754 int 3755 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3756 const char *new, enum uio_seg pathseg) 3757 { 3758 struct mount *mp = NULL; 3759 struct vnode *tvp, *fvp, *tdvp; 3760 struct nameidata fromnd, tond; 3761 uint64_t tondflags; 3762 int error; 3763 short irflag; 3764 3765 again: 3766 bwillwrite(); 3767 #ifdef MAC 3768 if (mac_vnode_check_rename_from_enabled()) { 3769 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg, 3770 &fromnd); 3771 if (error != 0) 3772 return (error); 3773 } else { 3774 #endif 3775 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | AUDITVNODE1, 3776 pathseg, old, oldfd, &cap_renameat_source_rights); 3777 if ((error = namei(&fromnd)) != 0) 3778 return (error); 3779 #ifdef MAC 3780 } 3781 #endif 3782 fvp = fromnd.ni_vp; 3783 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | AUDITVNODE2; 3784 if (fromnd.ni_vp->v_type == VDIR) 3785 tondflags |= WILLBEDIR; 3786 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd, 3787 &cap_renameat_target_rights); 3788 if ((error = namei(&tond)) != 0) { 3789 /* Translate error code for rename("dir1", "dir2/."). */ 3790 if (error == EISDIR && fvp->v_type == VDIR) 3791 error = EINVAL; 3792 NDFREE_PNBUF(&fromnd); 3793 vrele(fromnd.ni_dvp); 3794 vrele(fvp); 3795 goto out1; 3796 } 3797 tdvp = tond.ni_dvp; 3798 tvp = tond.ni_vp; 3799 error = vn_start_write(fvp, &mp, V_NOWAIT); 3800 if (error != 0) { 3801 NDFREE_PNBUF(&fromnd); 3802 NDFREE_PNBUF(&tond); 3803 if (tvp != NULL) 3804 vput(tvp); 3805 if (tdvp == tvp) 3806 vrele(tdvp); 3807 else 3808 vput(tdvp); 3809 vrele(fromnd.ni_dvp); 3810 vrele(fvp); 3811 error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH); 3812 if (error != 0) 3813 return (error); 3814 goto again; 3815 } 3816 irflag = vn_irflag_read(fvp); 3817 if (((irflag & VIRF_NAMEDATTR) != 0 && tdvp != fromnd.ni_dvp) || 3818 (irflag & VIRF_NAMEDDIR) != 0) { 3819 error = EINVAL; 3820 goto out; 3821 } 3822 if (tvp != NULL) { 3823 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3824 error = ENOTDIR; 3825 goto out; 3826 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3827 error = EISDIR; 3828 goto out; 3829 } 3830 #ifdef CAPABILITIES 3831 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3832 /* 3833 * If the target already exists we require CAP_UNLINKAT 3834 * from 'newfd', when newfd was used for the lookup. 3835 */ 3836 error = cap_check(&tond.ni_filecaps.fc_rights, 3837 &cap_unlinkat_rights); 3838 if (error != 0) 3839 goto out; 3840 } 3841 #endif 3842 } 3843 if (fvp == tdvp) { 3844 error = EINVAL; 3845 goto out; 3846 } 3847 /* 3848 * If the source is the same as the destination (that is, if they 3849 * are links to the same vnode), then there is nothing to do. 3850 */ 3851 if (fvp == tvp) 3852 error = ERESTART; 3853 #ifdef MAC 3854 else 3855 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3856 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3857 #endif 3858 out: 3859 if (error == 0) { 3860 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3861 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3862 NDFREE_PNBUF(&fromnd); 3863 NDFREE_PNBUF(&tond); 3864 } else { 3865 NDFREE_PNBUF(&fromnd); 3866 NDFREE_PNBUF(&tond); 3867 if (tvp != NULL) 3868 vput(tvp); 3869 if (tdvp == tvp) 3870 vrele(tdvp); 3871 else 3872 vput(tdvp); 3873 vrele(fromnd.ni_dvp); 3874 vrele(fvp); 3875 } 3876 vn_finished_write(mp); 3877 out1: 3878 if (error == ERESTART) 3879 return (0); 3880 if (error == ERELOOKUP) 3881 goto again; 3882 return (error); 3883 } 3884 3885 /* 3886 * Make a directory file. 3887 */ 3888 #ifndef _SYS_SYSPROTO_H_ 3889 struct mkdir_args { 3890 char *path; 3891 int mode; 3892 }; 3893 #endif 3894 int 3895 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3896 { 3897 3898 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3899 uap->mode)); 3900 } 3901 3902 #ifndef _SYS_SYSPROTO_H_ 3903 struct mkdirat_args { 3904 int fd; 3905 char *path; 3906 mode_t mode; 3907 }; 3908 #endif 3909 int 3910 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3911 { 3912 3913 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3914 } 3915 3916 int 3917 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3918 int mode) 3919 { 3920 struct mount *mp; 3921 struct vattr vattr; 3922 struct nameidata nd; 3923 int error; 3924 3925 AUDIT_ARG_MODE(mode); 3926 NDPREINIT(&nd); 3927 restart: 3928 bwillwrite(); 3929 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | 3930 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR, 3931 segflg, path, fd, &cap_mkdirat_rights); 3932 if ((error = namei(&nd)) != 0) 3933 return (error); 3934 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3935 NDFREE_PNBUF(&nd); 3936 vput(nd.ni_dvp); 3937 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 3938 return (error); 3939 goto restart; 3940 } 3941 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) { 3942 error = EINVAL; 3943 goto out; 3944 } 3945 VATTR_NULL(&vattr); 3946 vattr.va_type = VDIR; 3947 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask; 3948 #ifdef MAC 3949 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3950 &vattr); 3951 if (error != 0) 3952 goto out; 3953 #endif 3954 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3955 out: 3956 NDFREE_PNBUF(&nd); 3957 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 3958 vn_finished_write(mp); 3959 if (error == ERELOOKUP) 3960 goto restart; 3961 return (error); 3962 } 3963 3964 /* 3965 * Remove a directory file. 3966 */ 3967 #ifndef _SYS_SYSPROTO_H_ 3968 struct rmdir_args { 3969 char *path; 3970 }; 3971 #endif 3972 int 3973 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3974 { 3975 3976 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3977 0)); 3978 } 3979 3980 int 3981 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3982 enum uio_seg pathseg, int flag) 3983 { 3984 struct mount *mp; 3985 struct vnode *vp; 3986 struct file *fp; 3987 struct nameidata nd; 3988 cap_rights_t rights; 3989 int error; 3990 3991 fp = NULL; 3992 if (fd != FD_NONE) { 3993 error = getvnode(td, fd, cap_rights_init_one(&rights, 3994 CAP_LOOKUP), &fp); 3995 if (error != 0) 3996 return (error); 3997 } 3998 3999 NDPREINIT(&nd); 4000 restart: 4001 bwillwrite(); 4002 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 4003 at2cnpflags(flag, AT_RESOLVE_BENEATH), 4004 pathseg, path, dfd, &cap_unlinkat_rights); 4005 if ((error = namei(&nd)) != 0) 4006 goto fdout; 4007 vp = nd.ni_vp; 4008 if (vp->v_type != VDIR) { 4009 error = ENOTDIR; 4010 goto out; 4011 } 4012 /* 4013 * No rmdir "." please. 4014 */ 4015 if (nd.ni_dvp == vp) { 4016 error = EINVAL; 4017 goto out; 4018 } 4019 /* 4020 * The root of a mounted filesystem cannot be deleted. 4021 */ 4022 if (vp->v_vflag & VV_ROOT) { 4023 error = EBUSY; 4024 goto out; 4025 } 4026 4027 if (fp != NULL && fp->f_vnode != vp) { 4028 if (VN_IS_DOOMED(fp->f_vnode)) 4029 error = EBADF; 4030 else 4031 error = EDEADLK; 4032 goto out; 4033 } 4034 4035 #ifdef MAC 4036 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 4037 &nd.ni_cnd); 4038 if (error != 0) 4039 goto out; 4040 #endif 4041 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 4042 NDFREE_PNBUF(&nd); 4043 vput(vp); 4044 if (nd.ni_dvp == vp) 4045 vrele(nd.ni_dvp); 4046 else 4047 vput(nd.ni_dvp); 4048 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0) 4049 goto fdout; 4050 goto restart; 4051 } 4052 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 4053 vn_finished_write(mp); 4054 out: 4055 NDFREE_PNBUF(&nd); 4056 vput(vp); 4057 if (nd.ni_dvp == vp) 4058 vrele(nd.ni_dvp); 4059 else 4060 vput(nd.ni_dvp); 4061 if (error == ERELOOKUP) 4062 goto restart; 4063 fdout: 4064 if (fp != NULL) 4065 fdrop(fp, td); 4066 return (error); 4067 } 4068 4069 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 4070 int 4071 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 4072 long *basep, void (*func)(struct freebsd11_dirent *)) 4073 { 4074 struct freebsd11_dirent dstdp; 4075 struct dirent *dp, *edp; 4076 char *dirbuf; 4077 off_t base; 4078 ssize_t resid, ucount; 4079 int error; 4080 4081 /* XXX arbitrary sanity limit on `count'. */ 4082 count = min(count, 64 * 1024); 4083 4084 dirbuf = malloc(count, M_TEMP, M_WAITOK); 4085 4086 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 4087 UIO_SYSSPACE); 4088 if (error != 0) 4089 goto done; 4090 if (basep != NULL) 4091 *basep = base; 4092 4093 ucount = 0; 4094 for (dp = (struct dirent *)dirbuf, 4095 edp = (struct dirent *)&dirbuf[count - resid]; 4096 ucount < count && dp < edp; ) { 4097 if (dp->d_reclen == 0) 4098 break; 4099 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 4100 if (dp->d_namlen >= sizeof(dstdp.d_name)) 4101 continue; 4102 dstdp.d_type = dp->d_type; 4103 dstdp.d_namlen = dp->d_namlen; 4104 dstdp.d_fileno = dp->d_fileno; /* truncate */ 4105 if (dstdp.d_fileno != dp->d_fileno) { 4106 switch (ino64_trunc_error) { 4107 default: 4108 case 0: 4109 break; 4110 case 1: 4111 error = EOVERFLOW; 4112 goto done; 4113 case 2: 4114 dstdp.d_fileno = UINT32_MAX; 4115 break; 4116 } 4117 } 4118 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 4119 ((dp->d_namlen + 1 + 3) &~ 3); 4120 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 4121 bzero(dstdp.d_name + dstdp.d_namlen, 4122 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 4123 dstdp.d_namlen); 4124 MPASS(dstdp.d_reclen <= dp->d_reclen); 4125 MPASS(ucount + dstdp.d_reclen <= count); 4126 if (func != NULL) 4127 func(&dstdp); 4128 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 4129 if (error != 0) 4130 break; 4131 dp = (struct dirent *)((char *)dp + dp->d_reclen); 4132 ucount += dstdp.d_reclen; 4133 } 4134 4135 done: 4136 free(dirbuf, M_TEMP); 4137 if (error == 0) 4138 td->td_retval[0] = ucount; 4139 return (error); 4140 } 4141 #endif /* COMPAT */ 4142 4143 #ifdef COMPAT_43 4144 static void 4145 ogetdirentries_cvt(struct freebsd11_dirent *dp) 4146 { 4147 #if (BYTE_ORDER == LITTLE_ENDIAN) 4148 /* 4149 * The expected low byte of dp->d_namlen is our dp->d_type. 4150 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 4151 */ 4152 dp->d_type = dp->d_namlen; 4153 dp->d_namlen = 0; 4154 #else 4155 /* 4156 * The dp->d_type is the high byte of the expected dp->d_namlen, 4157 * so must be zero'ed. 4158 */ 4159 dp->d_type = 0; 4160 #endif 4161 } 4162 4163 /* 4164 * Read a block of directory entries in a filesystem independent format. 4165 */ 4166 #ifndef _SYS_SYSPROTO_H_ 4167 struct ogetdirentries_args { 4168 int fd; 4169 char *buf; 4170 u_int count; 4171 long *basep; 4172 }; 4173 #endif 4174 int 4175 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 4176 { 4177 long loff; 4178 int error; 4179 4180 error = kern_ogetdirentries(td, uap, &loff); 4181 if (error == 0) 4182 error = copyout(&loff, uap->basep, sizeof(long)); 4183 return (error); 4184 } 4185 4186 int 4187 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 4188 long *ploff) 4189 { 4190 long base; 4191 int error; 4192 4193 /* XXX arbitrary sanity limit on `count'. */ 4194 if (uap->count > 64 * 1024) 4195 return (EINVAL); 4196 4197 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4198 &base, ogetdirentries_cvt); 4199 4200 if (error == 0 && uap->basep != NULL) 4201 error = copyout(&base, uap->basep, sizeof(long)); 4202 4203 return (error); 4204 } 4205 #endif /* COMPAT_43 */ 4206 4207 #if defined(COMPAT_FREEBSD11) 4208 #ifndef _SYS_SYSPROTO_H_ 4209 struct freebsd11_getdirentries_args { 4210 int fd; 4211 char *buf; 4212 u_int count; 4213 long *basep; 4214 }; 4215 #endif 4216 int 4217 freebsd11_getdirentries(struct thread *td, 4218 struct freebsd11_getdirentries_args *uap) 4219 { 4220 long base; 4221 int error; 4222 4223 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4224 &base, NULL); 4225 4226 if (error == 0 && uap->basep != NULL) 4227 error = copyout(&base, uap->basep, sizeof(long)); 4228 return (error); 4229 } 4230 4231 int 4232 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 4233 { 4234 struct freebsd11_getdirentries_args ap; 4235 4236 ap.fd = uap->fd; 4237 ap.buf = uap->buf; 4238 ap.count = uap->count; 4239 ap.basep = NULL; 4240 return (freebsd11_getdirentries(td, &ap)); 4241 } 4242 #endif /* COMPAT_FREEBSD11 */ 4243 4244 /* 4245 * Read a block of directory entries in a filesystem independent format. 4246 */ 4247 int 4248 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4249 { 4250 off_t base; 4251 int error; 4252 4253 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4254 NULL, UIO_USERSPACE); 4255 if (error != 0) 4256 return (error); 4257 if (uap->basep != NULL) 4258 error = copyout(&base, uap->basep, sizeof(off_t)); 4259 return (error); 4260 } 4261 4262 int 4263 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4264 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4265 { 4266 struct vnode *vp; 4267 struct file *fp; 4268 struct uio auio; 4269 struct iovec aiov; 4270 off_t loff; 4271 int error, eofflag; 4272 off_t foffset; 4273 4274 AUDIT_ARG_FD(fd); 4275 if (count > IOSIZE_MAX) 4276 return (EINVAL); 4277 auio.uio_resid = count; 4278 error = getvnode(td, fd, &cap_read_rights, &fp); 4279 if (error != 0) 4280 return (error); 4281 if ((fp->f_flag & FREAD) == 0) { 4282 fdrop(fp, td); 4283 return (EBADF); 4284 } 4285 vp = fp->f_vnode; 4286 foffset = foffset_lock(fp, 0); 4287 unionread: 4288 if (vp->v_type != VDIR) { 4289 error = EINVAL; 4290 goto fail; 4291 } 4292 if (__predict_false((vp->v_vflag & VV_UNLINKED) != 0)) { 4293 error = ENOENT; 4294 goto fail; 4295 } 4296 aiov.iov_base = buf; 4297 aiov.iov_len = count; 4298 auio.uio_iov = &aiov; 4299 auio.uio_iovcnt = 1; 4300 auio.uio_rw = UIO_READ; 4301 auio.uio_segflg = bufseg; 4302 auio.uio_td = td; 4303 vn_lock(vp, LK_SHARED | LK_RETRY); 4304 AUDIT_ARG_VNODE1(vp); 4305 loff = auio.uio_offset = foffset; 4306 #ifdef MAC 4307 error = mac_vnode_check_readdir(td->td_ucred, vp); 4308 if (error == 0) 4309 #endif 4310 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4311 NULL); 4312 foffset = auio.uio_offset; 4313 if (error != 0) { 4314 VOP_UNLOCK(vp); 4315 goto fail; 4316 } 4317 if (count == auio.uio_resid && 4318 (vp->v_vflag & VV_ROOT) && 4319 (vp->v_mount->mnt_flag & MNT_UNION)) { 4320 struct vnode *tvp = vp; 4321 4322 vp = vp->v_mount->mnt_vnodecovered; 4323 VREF(vp); 4324 fp->f_vnode = vp; 4325 foffset = 0; 4326 vput(tvp); 4327 goto unionread; 4328 } 4329 VOP_UNLOCK(vp); 4330 *basep = loff; 4331 if (residp != NULL) 4332 *residp = auio.uio_resid; 4333 td->td_retval[0] = count - auio.uio_resid; 4334 fail: 4335 foffset_unlock(fp, foffset, 0); 4336 fdrop(fp, td); 4337 return (error); 4338 } 4339 4340 /* 4341 * Set the mode mask for creation of filesystem nodes. 4342 */ 4343 #ifndef _SYS_SYSPROTO_H_ 4344 struct umask_args { 4345 int newmask; 4346 }; 4347 #endif 4348 int 4349 sys_umask(struct thread *td, struct umask_args *uap) 4350 { 4351 struct pwddesc *pdp; 4352 4353 pdp = td->td_proc->p_pd; 4354 PWDDESC_XLOCK(pdp); 4355 td->td_retval[0] = pdp->pd_cmask; 4356 pdp->pd_cmask = uap->newmask & ALLPERMS; 4357 PWDDESC_XUNLOCK(pdp); 4358 return (0); 4359 } 4360 4361 /* 4362 * Void all references to file by ripping underlying filesystem away from 4363 * vnode. 4364 */ 4365 #ifndef _SYS_SYSPROTO_H_ 4366 struct revoke_args { 4367 char *path; 4368 }; 4369 #endif 4370 int 4371 sys_revoke(struct thread *td, struct revoke_args *uap) 4372 { 4373 struct vnode *vp; 4374 struct vattr vattr; 4375 struct nameidata nd; 4376 int error; 4377 4378 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4379 uap->path); 4380 if ((error = namei(&nd)) != 0) 4381 return (error); 4382 vp = nd.ni_vp; 4383 NDFREE_PNBUF(&nd); 4384 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4385 error = EINVAL; 4386 goto out; 4387 } 4388 #ifdef MAC 4389 error = mac_vnode_check_revoke(td->td_ucred, vp); 4390 if (error != 0) 4391 goto out; 4392 #endif 4393 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4394 if (error != 0) 4395 goto out; 4396 if (td->td_ucred->cr_uid != vattr.va_uid) { 4397 error = priv_check(td, PRIV_VFS_ADMIN); 4398 if (error != 0) 4399 goto out; 4400 } 4401 if (devfs_usecount(vp) > 0) 4402 VOP_REVOKE(vp, REVOKEALL); 4403 out: 4404 vput(vp); 4405 return (error); 4406 } 4407 4408 /* 4409 * This variant of getvnode() allows O_PATH files. Caller should 4410 * ensure that returned file and vnode are only used for compatible 4411 * semantics. 4412 */ 4413 int 4414 getvnode_path(struct thread *td, int fd, cap_rights_t *rightsp, 4415 struct file **fpp) 4416 { 4417 struct file *fp; 4418 int error; 4419 4420 error = fget_unlocked(td, fd, rightsp, &fp); 4421 if (error != 0) 4422 return (error); 4423 4424 /* 4425 * The file could be not of the vnode type, or it may be not 4426 * yet fully initialized, in which case the f_vnode pointer 4427 * may be set, but f_ops is still badfileops. E.g., 4428 * devfs_open() transiently create such situation to 4429 * facilitate csw d_fdopen(). 4430 * 4431 * Dupfdopen() handling in kern_openat() installs the 4432 * half-baked file into the process descriptor table, allowing 4433 * other thread to dereference it. Guard against the race by 4434 * checking f_ops. 4435 */ 4436 if (__predict_false(fp->f_vnode == NULL || fp->f_ops == &badfileops)) { 4437 fdrop(fp, td); 4438 *fpp = NULL; 4439 return (EINVAL); 4440 } 4441 4442 *fpp = fp; 4443 return (0); 4444 } 4445 4446 /* 4447 * Convert a user file descriptor to a kernel file entry and check 4448 * that, if it is a capability, the correct rights are present. 4449 * A reference on the file entry is held upon returning. 4450 */ 4451 int 4452 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4453 { 4454 int error; 4455 4456 error = getvnode_path(td, fd, rightsp, fpp); 4457 if (__predict_false(error != 0)) 4458 return (error); 4459 4460 /* 4461 * Filter out O_PATH file descriptors, most getvnode() callers 4462 * do not call fo_ methods. 4463 */ 4464 if (__predict_false((*fpp)->f_ops == &path_fileops)) { 4465 fdrop(*fpp, td); 4466 *fpp = NULL; 4467 error = EBADF; 4468 } 4469 4470 return (error); 4471 } 4472 4473 /* 4474 * Get an (NFS) file handle. 4475 */ 4476 #ifndef _SYS_SYSPROTO_H_ 4477 struct lgetfh_args { 4478 char *fname; 4479 fhandle_t *fhp; 4480 }; 4481 #endif 4482 int 4483 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4484 { 4485 4486 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4487 UIO_USERSPACE, uap->fhp, UIO_USERSPACE)); 4488 } 4489 4490 #ifndef _SYS_SYSPROTO_H_ 4491 struct getfh_args { 4492 char *fname; 4493 fhandle_t *fhp; 4494 }; 4495 #endif 4496 int 4497 sys_getfh(struct thread *td, struct getfh_args *uap) 4498 { 4499 4500 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4501 uap->fhp, UIO_USERSPACE)); 4502 } 4503 4504 /* 4505 * syscall for the rpc.lockd to use to translate an open descriptor into 4506 * a NFS file handle. 4507 * 4508 * warning: do not remove the priv_check() call or this becomes one giant 4509 * security hole. 4510 */ 4511 #ifndef _SYS_SYSPROTO_H_ 4512 struct getfhat_args { 4513 int fd; 4514 char *path; 4515 fhandle_t *fhp; 4516 int flags; 4517 }; 4518 #endif 4519 int 4520 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4521 { 4522 4523 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4524 uap->fhp, UIO_USERSPACE)); 4525 } 4526 4527 int 4528 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4529 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg) 4530 { 4531 struct nameidata nd; 4532 fhandle_t fh; 4533 struct vnode *vp; 4534 int error; 4535 4536 if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4537 return (EINVAL); 4538 error = priv_check(td, PRIV_VFS_GETFH); 4539 if (error != 0) 4540 return (error); 4541 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4542 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4543 fd); 4544 error = namei(&nd); 4545 if (error != 0) 4546 return (error); 4547 NDFREE_PNBUF(&nd); 4548 vp = nd.ni_vp; 4549 bzero(&fh, sizeof(fh)); 4550 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4551 error = VOP_VPTOFH(vp, &fh.fh_fid); 4552 vput(vp); 4553 if (error == 0) { 4554 if (fhseg == UIO_USERSPACE) 4555 error = copyout(&fh, fhp, sizeof (fh)); 4556 else 4557 memcpy(fhp, &fh, sizeof(fh)); 4558 } 4559 return (error); 4560 } 4561 4562 #ifndef _SYS_SYSPROTO_H_ 4563 struct fhlink_args { 4564 fhandle_t *fhp; 4565 const char *to; 4566 }; 4567 #endif 4568 int 4569 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4570 { 4571 4572 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4573 } 4574 4575 #ifndef _SYS_SYSPROTO_H_ 4576 struct fhlinkat_args { 4577 fhandle_t *fhp; 4578 int tofd; 4579 const char *to; 4580 }; 4581 #endif 4582 int 4583 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4584 { 4585 4586 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4587 } 4588 4589 static int 4590 kern_fhlinkat(struct thread *td, int fd, const char *path, 4591 enum uio_seg pathseg, fhandle_t *fhp) 4592 { 4593 fhandle_t fh; 4594 struct mount *mp; 4595 struct vnode *vp; 4596 int error; 4597 4598 error = priv_check(td, PRIV_VFS_GETFH); 4599 if (error != 0) 4600 return (error); 4601 error = copyin(fhp, &fh, sizeof(fh)); 4602 if (error != 0) 4603 return (error); 4604 do { 4605 bwillwrite(); 4606 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4607 return (ESTALE); 4608 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4609 vfs_unbusy(mp); 4610 if (error != 0) 4611 return (error); 4612 VOP_UNLOCK(vp); 4613 error = kern_linkat_vp(td, vp, fd, path, pathseg); 4614 } while (error == EAGAIN || error == ERELOOKUP); 4615 return (error); 4616 } 4617 4618 #ifndef _SYS_SYSPROTO_H_ 4619 struct fhreadlink_args { 4620 fhandle_t *fhp; 4621 char *buf; 4622 size_t bufsize; 4623 }; 4624 #endif 4625 int 4626 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4627 { 4628 fhandle_t fh; 4629 struct mount *mp; 4630 struct vnode *vp; 4631 int error; 4632 4633 error = priv_check(td, PRIV_VFS_GETFH); 4634 if (error != 0) 4635 return (error); 4636 if (uap->bufsize > IOSIZE_MAX) 4637 return (EINVAL); 4638 error = copyin(uap->fhp, &fh, sizeof(fh)); 4639 if (error != 0) 4640 return (error); 4641 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4642 return (ESTALE); 4643 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4644 vfs_unbusy(mp); 4645 if (error != 0) 4646 return (error); 4647 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4648 vput(vp); 4649 return (error); 4650 } 4651 4652 /* 4653 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4654 * open descriptor. 4655 * 4656 * warning: do not remove the priv_check() call or this becomes one giant 4657 * security hole. 4658 */ 4659 #ifndef _SYS_SYSPROTO_H_ 4660 struct fhopen_args { 4661 const struct fhandle *u_fhp; 4662 int flags; 4663 }; 4664 #endif 4665 int 4666 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4667 { 4668 return (kern_fhopen(td, uap->u_fhp, uap->flags)); 4669 } 4670 4671 int 4672 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags) 4673 { 4674 struct mount *mp; 4675 struct vnode *vp; 4676 struct fhandle fhp; 4677 struct file *fp; 4678 int error, indx; 4679 bool named_attr; 4680 4681 error = priv_check(td, PRIV_VFS_FHOPEN); 4682 if (error != 0) 4683 return (error); 4684 4685 indx = -1; 4686 if ((flags & O_CREAT) != 0) 4687 return (EINVAL); 4688 error = openflags(&flags); 4689 if (error != 0) 4690 return (error); 4691 error = copyin(u_fhp, &fhp, sizeof(fhp)); 4692 if (error != 0) 4693 return (error); 4694 /* find the mount point */ 4695 mp = vfs_busyfs(&fhp.fh_fsid); 4696 if (mp == NULL) 4697 return (ESTALE); 4698 /* now give me my vnode, it gets returned to me locked */ 4699 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4700 vfs_unbusy(mp); 4701 if (error != 0) 4702 return (error); 4703 4704 /* 4705 * Check to see if the file handle refers to a named attribute 4706 * directory or attribute. If it does, the O_NAMEDATTR flag 4707 * must have been specified. 4708 */ 4709 named_attr = (vn_irflag_read(vp) & 4710 (VIRF_NAMEDDIR | VIRF_NAMEDATTR)) != 0; 4711 if ((named_attr && (flags & O_NAMEDATTR) == 0) || 4712 (!named_attr && (flags & O_NAMEDATTR) != 0)) { 4713 vput(vp); 4714 return (ENOATTR); 4715 } 4716 4717 error = falloc_noinstall(td, &fp); 4718 if (error != 0) { 4719 vput(vp); 4720 return (error); 4721 } 4722 /* Set the flags early so the finit in devfs can pick them up. */ 4723 fp->f_flag = flags & FMASK; 4724 4725 #ifdef INVARIANTS 4726 td->td_dupfd = -1; 4727 #endif 4728 error = vn_open_vnode(vp, flags, td->td_ucred, td, fp); 4729 if (error != 0) { 4730 KASSERT(fp->f_ops == &badfileops, 4731 ("VOP_OPEN in fhopen() set f_ops")); 4732 KASSERT(td->td_dupfd < 0, 4733 ("fhopen() encountered fdopen()")); 4734 4735 vput(vp); 4736 goto bad; 4737 } 4738 #ifdef INVARIANTS 4739 td->td_dupfd = 0; 4740 #endif 4741 finit_open(fp, vp, flags); 4742 VOP_UNLOCK(vp); 4743 if ((flags & O_TRUNC) != 0) { 4744 error = fo_truncate(fp, 0, td->td_ucred, td); 4745 if (error != 0) 4746 goto bad; 4747 } 4748 4749 error = finstall(td, fp, &indx, flags, NULL); 4750 bad: 4751 fdrop(fp, td); 4752 td->td_retval[0] = indx; 4753 return (error); 4754 } 4755 4756 /* 4757 * Stat an (NFS) file handle. 4758 */ 4759 #ifndef _SYS_SYSPROTO_H_ 4760 struct fhstat_args { 4761 struct fhandle *u_fhp; 4762 struct stat *sb; 4763 }; 4764 #endif 4765 int 4766 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4767 { 4768 struct stat sb; 4769 struct fhandle fh; 4770 int error; 4771 4772 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4773 if (error != 0) 4774 return (error); 4775 error = kern_fhstat(td, fh, &sb); 4776 if (error == 0) 4777 error = copyout(&sb, uap->sb, sizeof(sb)); 4778 return (error); 4779 } 4780 4781 int 4782 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4783 { 4784 struct mount *mp; 4785 struct vnode *vp; 4786 int error; 4787 4788 error = priv_check(td, PRIV_VFS_FHSTAT); 4789 if (error != 0) 4790 return (error); 4791 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4792 return (ESTALE); 4793 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4794 vfs_unbusy(mp); 4795 if (error != 0) 4796 return (error); 4797 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED); 4798 vput(vp); 4799 return (error); 4800 } 4801 4802 /* 4803 * Implement fstatfs() for (NFS) file handles. 4804 */ 4805 #ifndef _SYS_SYSPROTO_H_ 4806 struct fhstatfs_args { 4807 struct fhandle *u_fhp; 4808 struct statfs *buf; 4809 }; 4810 #endif 4811 int 4812 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4813 { 4814 struct statfs *sfp; 4815 fhandle_t fh; 4816 int error; 4817 4818 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4819 if (error != 0) 4820 return (error); 4821 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4822 error = kern_fhstatfs(td, fh, sfp); 4823 if (error == 0) 4824 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4825 free(sfp, M_STATFS); 4826 return (error); 4827 } 4828 4829 int 4830 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4831 { 4832 struct mount *mp; 4833 struct vnode *vp; 4834 int error; 4835 4836 error = priv_check(td, PRIV_VFS_FHSTATFS); 4837 if (error != 0) 4838 return (error); 4839 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4840 return (ESTALE); 4841 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4842 if (error != 0) { 4843 vfs_unbusy(mp); 4844 return (error); 4845 } 4846 vput(vp); 4847 error = prison_canseemount(td->td_ucred, mp); 4848 if (error != 0) 4849 goto out; 4850 #ifdef MAC 4851 error = mac_mount_check_stat(td->td_ucred, mp); 4852 if (error != 0) 4853 goto out; 4854 #endif 4855 error = VFS_STATFS(mp, buf); 4856 out: 4857 vfs_unbusy(mp); 4858 return (error); 4859 } 4860 4861 /* 4862 * Unlike madvise(2), we do not make a best effort to remember every 4863 * possible caching hint. Instead, we remember the last setting with 4864 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4865 * region of any current setting. 4866 */ 4867 int 4868 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4869 int advice) 4870 { 4871 struct fadvise_info *fa, *new; 4872 struct file *fp; 4873 struct vnode *vp; 4874 off_t end; 4875 int error; 4876 4877 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4878 return (EINVAL); 4879 AUDIT_ARG_VALUE(advice); 4880 switch (advice) { 4881 case POSIX_FADV_SEQUENTIAL: 4882 case POSIX_FADV_RANDOM: 4883 case POSIX_FADV_NOREUSE: 4884 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4885 break; 4886 case POSIX_FADV_NORMAL: 4887 case POSIX_FADV_WILLNEED: 4888 case POSIX_FADV_DONTNEED: 4889 new = NULL; 4890 break; 4891 default: 4892 return (EINVAL); 4893 } 4894 /* XXX: CAP_POSIX_FADVISE? */ 4895 AUDIT_ARG_FD(fd); 4896 error = fget(td, fd, &cap_no_rights, &fp); 4897 if (error != 0) 4898 goto out; 4899 AUDIT_ARG_FILE(td->td_proc, fp); 4900 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4901 error = ESPIPE; 4902 goto out; 4903 } 4904 if (fp->f_type != DTYPE_VNODE) { 4905 error = ENODEV; 4906 goto out; 4907 } 4908 vp = fp->f_vnode; 4909 if (vp->v_type != VREG) { 4910 error = ENODEV; 4911 goto out; 4912 } 4913 if (len == 0) 4914 end = OFF_MAX; 4915 else 4916 end = offset + len - 1; 4917 switch (advice) { 4918 case POSIX_FADV_SEQUENTIAL: 4919 case POSIX_FADV_RANDOM: 4920 case POSIX_FADV_NOREUSE: 4921 /* 4922 * Try to merge any existing non-standard region with 4923 * this new region if possible, otherwise create a new 4924 * non-standard region for this request. 4925 */ 4926 mtx_pool_lock(mtxpool_sleep, fp); 4927 fa = fp->f_advice; 4928 if (fa != NULL && fa->fa_advice == advice && 4929 ((fa->fa_start <= end && fa->fa_end >= offset) || 4930 (end != OFF_MAX && fa->fa_start == end + 1) || 4931 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4932 if (offset < fa->fa_start) 4933 fa->fa_start = offset; 4934 if (end > fa->fa_end) 4935 fa->fa_end = end; 4936 } else { 4937 new->fa_advice = advice; 4938 new->fa_start = offset; 4939 new->fa_end = end; 4940 fp->f_advice = new; 4941 new = fa; 4942 } 4943 mtx_pool_unlock(mtxpool_sleep, fp); 4944 break; 4945 case POSIX_FADV_NORMAL: 4946 /* 4947 * If a the "normal" region overlaps with an existing 4948 * non-standard region, trim or remove the 4949 * non-standard region. 4950 */ 4951 mtx_pool_lock(mtxpool_sleep, fp); 4952 fa = fp->f_advice; 4953 if (fa != NULL) { 4954 if (offset <= fa->fa_start && end >= fa->fa_end) { 4955 new = fa; 4956 fp->f_advice = NULL; 4957 } else if (offset <= fa->fa_start && 4958 end >= fa->fa_start) 4959 fa->fa_start = end + 1; 4960 else if (offset <= fa->fa_end && end >= fa->fa_end) 4961 fa->fa_end = offset - 1; 4962 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4963 /* 4964 * If the "normal" region is a middle 4965 * portion of the existing 4966 * non-standard region, just remove 4967 * the whole thing rather than picking 4968 * one side or the other to 4969 * preserve. 4970 */ 4971 new = fa; 4972 fp->f_advice = NULL; 4973 } 4974 } 4975 mtx_pool_unlock(mtxpool_sleep, fp); 4976 break; 4977 case POSIX_FADV_WILLNEED: 4978 case POSIX_FADV_DONTNEED: 4979 error = VOP_ADVISE(vp, offset, end, advice); 4980 break; 4981 } 4982 out: 4983 if (fp != NULL) 4984 fdrop(fp, td); 4985 free(new, M_FADVISE); 4986 return (error); 4987 } 4988 4989 int 4990 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4991 { 4992 int error; 4993 4994 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4995 uap->advice); 4996 return (kern_posix_error(td, error)); 4997 } 4998 4999 int 5000 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 5001 off_t *outoffp, size_t len, unsigned int flags) 5002 { 5003 struct file *infp, *infp1, *outfp, *outfp1; 5004 struct vnode *invp, *outvp; 5005 int error; 5006 size_t retlen; 5007 void *rl_rcookie, *rl_wcookie; 5008 off_t inoff, outoff, savinoff, savoutoff; 5009 bool foffsets_locked; 5010 5011 infp = outfp = NULL; 5012 rl_rcookie = rl_wcookie = NULL; 5013 foffsets_locked = false; 5014 error = 0; 5015 retlen = 0; 5016 5017 if (flags != 0) { 5018 error = EINVAL; 5019 goto out; 5020 } 5021 if (len > SSIZE_MAX) 5022 /* 5023 * Although the len argument is size_t, the return argument 5024 * is ssize_t (which is signed). Therefore a size that won't 5025 * fit in ssize_t can't be returned. 5026 */ 5027 len = SSIZE_MAX; 5028 5029 /* Get the file structures for the file descriptors. */ 5030 error = fget_read(td, infd, 5031 inoffp != NULL ? &cap_pread_rights : &cap_read_rights, &infp); 5032 if (error != 0) 5033 goto out; 5034 if (infp->f_ops == &badfileops) { 5035 error = EBADF; 5036 goto out; 5037 } 5038 if (infp->f_vnode == NULL) { 5039 error = EINVAL; 5040 goto out; 5041 } 5042 error = fget_write(td, outfd, 5043 outoffp != NULL ? &cap_pwrite_rights : &cap_write_rights, &outfp); 5044 if (error != 0) 5045 goto out; 5046 if (outfp->f_ops == &badfileops) { 5047 error = EBADF; 5048 goto out; 5049 } 5050 if (outfp->f_vnode == NULL) { 5051 error = EINVAL; 5052 goto out; 5053 } 5054 5055 /* 5056 * Figure out which file offsets we're reading from and writing to. 5057 * If the offsets come from the file descriptions, we need to lock them, 5058 * and locking both offsets requires a loop to avoid deadlocks. 5059 */ 5060 infp1 = outfp1 = NULL; 5061 if (inoffp != NULL) 5062 inoff = *inoffp; 5063 else 5064 infp1 = infp; 5065 if (outoffp != NULL) 5066 outoff = *outoffp; 5067 else 5068 outfp1 = outfp; 5069 if (infp1 != NULL || outfp1 != NULL) { 5070 if (infp1 == outfp1) { 5071 /* 5072 * Overlapping ranges are not allowed. A more thorough 5073 * check appears below, but we must not lock the same 5074 * offset twice. 5075 */ 5076 error = EINVAL; 5077 goto out; 5078 } 5079 foffset_lock_pair(infp1, &inoff, outfp1, &outoff, 0); 5080 foffsets_locked = true; 5081 } 5082 savinoff = inoff; 5083 savoutoff = outoff; 5084 5085 invp = infp->f_vnode; 5086 outvp = outfp->f_vnode; 5087 /* Sanity check the f_flag bits. */ 5088 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 5089 (infp->f_flag & FREAD) == 0) { 5090 error = EBADF; 5091 goto out; 5092 } 5093 5094 /* If len == 0, just return 0. */ 5095 if (len == 0) 5096 goto out; 5097 5098 /* 5099 * Make sure that the ranges we check and lock below are valid. Note 5100 * that len is clamped to SSIZE_MAX above. 5101 */ 5102 if (inoff < 0 || outoff < 0) { 5103 error = EINVAL; 5104 goto out; 5105 } 5106 5107 /* 5108 * If infp and outfp refer to the same file, the byte ranges cannot 5109 * overlap. 5110 */ 5111 if (invp == outvp) { 5112 if ((inoff <= outoff && inoff + len > outoff) || 5113 (inoff > outoff && outoff + len > inoff)) { 5114 error = EINVAL; 5115 goto out; 5116 } 5117 rangelock_may_recurse(&invp->v_rl); 5118 } 5119 5120 /* Range lock the byte ranges for both invp and outvp. */ 5121 for (;;) { 5122 rl_wcookie = vn_rangelock_wlock(outvp, outoff, outoff + len); 5123 rl_rcookie = vn_rangelock_tryrlock(invp, inoff, inoff + len); 5124 if (rl_rcookie != NULL) 5125 break; 5126 vn_rangelock_unlock(outvp, rl_wcookie); 5127 rl_rcookie = vn_rangelock_rlock(invp, inoff, inoff + len); 5128 vn_rangelock_unlock(invp, rl_rcookie); 5129 } 5130 5131 retlen = len; 5132 error = vn_copy_file_range(invp, &inoff, outvp, &outoff, &retlen, 5133 flags, infp->f_cred, outfp->f_cred, td); 5134 out: 5135 if (rl_rcookie != NULL) 5136 vn_rangelock_unlock(invp, rl_rcookie); 5137 if (rl_wcookie != NULL) 5138 vn_rangelock_unlock(outvp, rl_wcookie); 5139 if (foffsets_locked) { 5140 if (error == EINTR || error == ERESTART) { 5141 inoff = savinoff; 5142 outoff = savoutoff; 5143 } 5144 if (inoffp == NULL) 5145 foffset_unlock(infp, inoff, 0); 5146 else 5147 *inoffp = inoff; 5148 if (outoffp == NULL) 5149 foffset_unlock(outfp, outoff, 0); 5150 else 5151 *outoffp = outoff; 5152 } 5153 if (outfp != NULL) 5154 fdrop(outfp, td); 5155 if (infp != NULL) 5156 fdrop(infp, td); 5157 td->td_retval[0] = retlen; 5158 return (error); 5159 } 5160 5161 int 5162 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 5163 { 5164 off_t inoff, outoff, *inoffp, *outoffp; 5165 int error; 5166 5167 inoffp = outoffp = NULL; 5168 if (uap->inoffp != NULL) { 5169 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 5170 if (error != 0) 5171 return (error); 5172 inoffp = &inoff; 5173 } 5174 if (uap->outoffp != NULL) { 5175 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 5176 if (error != 0) 5177 return (error); 5178 outoffp = &outoff; 5179 } 5180 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 5181 outoffp, uap->len, uap->flags); 5182 if (error == 0 && uap->inoffp != NULL) 5183 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 5184 if (error == 0 && uap->outoffp != NULL) 5185 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 5186 return (error); 5187 } 5188