1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include "opt_capsicum.h" 43 #include "opt_ktrace.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/capsicum.h> 50 #include <sys/disk.h> 51 #include <sys/sysent.h> 52 #include <sys/malloc.h> 53 #include <sys/mount.h> 54 #include <sys/mutex.h> 55 #include <sys/sysproto.h> 56 #include <sys/namei.h> 57 #include <sys/filedesc.h> 58 #include <sys/kernel.h> 59 #include <sys/fcntl.h> 60 #include <sys/file.h> 61 #include <sys/filio.h> 62 #include <sys/limits.h> 63 #include <sys/linker.h> 64 #include <sys/rwlock.h> 65 #include <sys/sdt.h> 66 #include <sys/stat.h> 67 #include <sys/sx.h> 68 #include <sys/unistd.h> 69 #include <sys/vnode.h> 70 #include <sys/priv.h> 71 #include <sys/proc.h> 72 #include <sys/dirent.h> 73 #include <sys/jail.h> 74 #include <sys/syscallsubr.h> 75 #include <sys/sysctl.h> 76 #ifdef KTRACE 77 #include <sys/ktrace.h> 78 #endif 79 80 #include <machine/stdarg.h> 81 82 #include <security/audit/audit.h> 83 #include <security/mac/mac_framework.h> 84 85 #include <vm/vm.h> 86 #include <vm/vm_object.h> 87 #include <vm/vm_page.h> 88 #include <vm/uma.h> 89 90 #include <fs/devfs/devfs.h> 91 92 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 93 94 static int kern_chflagsat(struct thread *td, int fd, const char *path, 95 enum uio_seg pathseg, u_long flags, int atflag); 96 static int setfflags(struct thread *td, struct vnode *, u_long); 97 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 98 static int getutimens(const struct timespec *, enum uio_seg, 99 struct timespec *, int *); 100 static int setutimes(struct thread *td, struct vnode *, 101 const struct timespec *, int, int); 102 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 103 struct thread *td); 104 static int kern_fhlinkat(struct thread *td, int fd, const char *path, 105 enum uio_seg pathseg, fhandle_t *fhp); 106 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, 107 size_t count, struct thread *td); 108 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, 109 const char *path, enum uio_seg segflag); 110 111 static uint64_t 112 at2cnpflags(u_int at_flags, u_int mask) 113 { 114 u_int64_t res; 115 116 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) != 117 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)); 118 119 res = 0; 120 at_flags &= mask; 121 if ((at_flags & AT_RESOLVE_BENEATH) != 0) 122 res |= RBENEATH; 123 if ((at_flags & AT_SYMLINK_FOLLOW) != 0) 124 res |= FOLLOW; 125 /* NOFOLLOW is pseudo flag */ 126 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) { 127 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 128 FOLLOW; 129 } 130 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0) 131 res |= EMPTYPATH; 132 return (res); 133 } 134 135 int 136 kern_sync(struct thread *td) 137 { 138 struct mount *mp, *nmp; 139 int save; 140 141 mtx_lock(&mountlist_mtx); 142 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 143 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 144 nmp = TAILQ_NEXT(mp, mnt_list); 145 continue; 146 } 147 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 148 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 149 save = curthread_pflags_set(TDP_SYNCIO); 150 vfs_periodic(mp, MNT_NOWAIT); 151 VFS_SYNC(mp, MNT_NOWAIT); 152 curthread_pflags_restore(save); 153 vn_finished_write(mp); 154 } 155 mtx_lock(&mountlist_mtx); 156 nmp = TAILQ_NEXT(mp, mnt_list); 157 vfs_unbusy(mp); 158 } 159 mtx_unlock(&mountlist_mtx); 160 return (0); 161 } 162 163 /* 164 * Sync each mounted filesystem. 165 */ 166 #ifndef _SYS_SYSPROTO_H_ 167 struct sync_args { 168 int dummy; 169 }; 170 #endif 171 /* ARGSUSED */ 172 int 173 sys_sync(struct thread *td, struct sync_args *uap) 174 { 175 176 return (kern_sync(td)); 177 } 178 179 /* 180 * Change filesystem quotas. 181 */ 182 #ifndef _SYS_SYSPROTO_H_ 183 struct quotactl_args { 184 char *path; 185 int cmd; 186 int uid; 187 caddr_t arg; 188 }; 189 #endif 190 int 191 sys_quotactl(struct thread *td, struct quotactl_args *uap) 192 { 193 struct mount *mp; 194 struct nameidata nd; 195 int error; 196 bool mp_busy; 197 198 AUDIT_ARG_CMD(uap->cmd); 199 AUDIT_ARG_UID(uap->uid); 200 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 201 return (EPERM); 202 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 203 uap->path, td); 204 if ((error = namei(&nd)) != 0) 205 return (error); 206 NDFREE(&nd, NDF_ONLY_PNBUF); 207 mp = nd.ni_vp->v_mount; 208 vfs_ref(mp); 209 vput(nd.ni_vp); 210 error = vfs_busy(mp, 0); 211 if (error != 0) { 212 vfs_rel(mp); 213 return (error); 214 } 215 mp_busy = true; 216 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, &mp_busy); 217 218 /* 219 * Since quota on/off operations typically need to open quota 220 * files, the implementation may need to unbusy the mount point 221 * before calling into namei. Otherwise, unmount might be 222 * started between two vfs_busy() invocations (first is ours, 223 * second is from mount point cross-walk code in lookup()), 224 * causing deadlock. 225 * 226 * Avoid unbusying mp if the implementation indicates it has 227 * already done so. 228 */ 229 if (mp_busy) 230 vfs_unbusy(mp); 231 vfs_rel(mp); 232 return (error); 233 } 234 235 /* 236 * Used by statfs conversion routines to scale the block size up if 237 * necessary so that all of the block counts are <= 'max_size'. Note 238 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 239 * value of 'n'. 240 */ 241 void 242 statfs_scale_blocks(struct statfs *sf, long max_size) 243 { 244 uint64_t count; 245 int shift; 246 247 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 248 249 /* 250 * Attempt to scale the block counts to give a more accurate 251 * overview to userland of the ratio of free space to used 252 * space. To do this, find the largest block count and compute 253 * a divisor that lets it fit into a signed integer <= max_size. 254 */ 255 if (sf->f_bavail < 0) 256 count = -sf->f_bavail; 257 else 258 count = sf->f_bavail; 259 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 260 if (count <= max_size) 261 return; 262 263 count >>= flsl(max_size); 264 shift = 0; 265 while (count > 0) { 266 shift++; 267 count >>=1; 268 } 269 270 sf->f_bsize <<= shift; 271 sf->f_blocks >>= shift; 272 sf->f_bfree >>= shift; 273 sf->f_bavail >>= shift; 274 } 275 276 static int 277 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 278 { 279 int error; 280 281 if (mp == NULL) 282 return (EBADF); 283 error = vfs_busy(mp, 0); 284 vfs_rel(mp); 285 if (error != 0) 286 return (error); 287 #ifdef MAC 288 error = mac_mount_check_stat(td->td_ucred, mp); 289 if (error != 0) 290 goto out; 291 #endif 292 error = VFS_STATFS(mp, buf); 293 if (error != 0) 294 goto out; 295 if (priv_check_cred_vfs_generation(td->td_ucred)) { 296 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 297 prison_enforce_statfs(td->td_ucred, mp, buf); 298 } 299 out: 300 vfs_unbusy(mp); 301 return (error); 302 } 303 304 /* 305 * Get filesystem statistics. 306 */ 307 #ifndef _SYS_SYSPROTO_H_ 308 struct statfs_args { 309 char *path; 310 struct statfs *buf; 311 }; 312 #endif 313 int 314 sys_statfs(struct thread *td, struct statfs_args *uap) 315 { 316 struct statfs *sfp; 317 int error; 318 319 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 320 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 321 if (error == 0) 322 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 323 free(sfp, M_STATFS); 324 return (error); 325 } 326 327 int 328 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg, 329 struct statfs *buf) 330 { 331 struct mount *mp; 332 struct nameidata nd; 333 int error; 334 335 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 336 error = namei(&nd); 337 if (error != 0) 338 return (error); 339 mp = vfs_ref_from_vp(nd.ni_vp); 340 NDFREE_NOTHING(&nd); 341 vrele(nd.ni_vp); 342 return (kern_do_statfs(td, mp, buf)); 343 } 344 345 /* 346 * Get filesystem statistics. 347 */ 348 #ifndef _SYS_SYSPROTO_H_ 349 struct fstatfs_args { 350 int fd; 351 struct statfs *buf; 352 }; 353 #endif 354 int 355 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 356 { 357 struct statfs *sfp; 358 int error; 359 360 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 361 error = kern_fstatfs(td, uap->fd, sfp); 362 if (error == 0) 363 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 364 free(sfp, M_STATFS); 365 return (error); 366 } 367 368 int 369 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 370 { 371 struct file *fp; 372 struct mount *mp; 373 struct vnode *vp; 374 int error; 375 376 AUDIT_ARG_FD(fd); 377 error = getvnode_path(td, fd, &cap_fstatfs_rights, &fp); 378 if (error != 0) 379 return (error); 380 vp = fp->f_vnode; 381 #ifdef AUDIT 382 if (AUDITING_TD(td)) { 383 vn_lock(vp, LK_SHARED | LK_RETRY); 384 AUDIT_ARG_VNODE1(vp); 385 VOP_UNLOCK(vp); 386 } 387 #endif 388 mp = vfs_ref_from_vp(vp); 389 fdrop(fp, td); 390 return (kern_do_statfs(td, mp, buf)); 391 } 392 393 /* 394 * Get statistics on all filesystems. 395 */ 396 #ifndef _SYS_SYSPROTO_H_ 397 struct getfsstat_args { 398 struct statfs *buf; 399 long bufsize; 400 int mode; 401 }; 402 #endif 403 int 404 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 405 { 406 size_t count; 407 int error; 408 409 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 410 return (EINVAL); 411 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 412 UIO_USERSPACE, uap->mode); 413 if (error == 0) 414 td->td_retval[0] = count; 415 return (error); 416 } 417 418 /* 419 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 420 * The caller is responsible for freeing memory which will be allocated 421 * in '*buf'. 422 */ 423 int 424 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 425 size_t *countp, enum uio_seg bufseg, int mode) 426 { 427 struct mount *mp, *nmp; 428 struct statfs *sfsp, *sp, *sptmp, *tofree; 429 size_t count, maxcount; 430 int error; 431 432 switch (mode) { 433 case MNT_WAIT: 434 case MNT_NOWAIT: 435 break; 436 default: 437 if (bufseg == UIO_SYSSPACE) 438 *buf = NULL; 439 return (EINVAL); 440 } 441 restart: 442 maxcount = bufsize / sizeof(struct statfs); 443 if (bufsize == 0) { 444 sfsp = NULL; 445 tofree = NULL; 446 } else if (bufseg == UIO_USERSPACE) { 447 sfsp = *buf; 448 tofree = NULL; 449 } else /* if (bufseg == UIO_SYSSPACE) */ { 450 count = 0; 451 mtx_lock(&mountlist_mtx); 452 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 453 count++; 454 } 455 mtx_unlock(&mountlist_mtx); 456 if (maxcount > count) 457 maxcount = count; 458 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 459 M_STATFS, M_WAITOK); 460 } 461 462 count = 0; 463 464 /* 465 * If there is no target buffer they only want the count. 466 * 467 * This could be TAILQ_FOREACH but it is open-coded to match the original 468 * code below. 469 */ 470 if (sfsp == NULL) { 471 mtx_lock(&mountlist_mtx); 472 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 473 if (prison_canseemount(td->td_ucred, mp) != 0) { 474 nmp = TAILQ_NEXT(mp, mnt_list); 475 continue; 476 } 477 #ifdef MAC 478 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 479 nmp = TAILQ_NEXT(mp, mnt_list); 480 continue; 481 } 482 #endif 483 count++; 484 nmp = TAILQ_NEXT(mp, mnt_list); 485 } 486 mtx_unlock(&mountlist_mtx); 487 *countp = count; 488 return (0); 489 } 490 491 /* 492 * They want the entire thing. 493 * 494 * Short-circuit the corner case of no room for anything, avoids 495 * relocking below. 496 */ 497 if (maxcount < 1) { 498 goto out; 499 } 500 501 mtx_lock(&mountlist_mtx); 502 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 503 if (prison_canseemount(td->td_ucred, mp) != 0) { 504 nmp = TAILQ_NEXT(mp, mnt_list); 505 continue; 506 } 507 #ifdef MAC 508 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 509 nmp = TAILQ_NEXT(mp, mnt_list); 510 continue; 511 } 512 #endif 513 if (mode == MNT_WAIT) { 514 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 515 /* 516 * If vfs_busy() failed, and MBF_NOWAIT 517 * wasn't passed, then the mp is gone. 518 * Furthermore, because of MBF_MNTLSTLOCK, 519 * the mountlist_mtx was dropped. We have 520 * no other choice than to start over. 521 */ 522 mtx_unlock(&mountlist_mtx); 523 free(tofree, M_STATFS); 524 goto restart; 525 } 526 } else { 527 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 528 nmp = TAILQ_NEXT(mp, mnt_list); 529 continue; 530 } 531 } 532 sp = &mp->mnt_stat; 533 /* 534 * If MNT_NOWAIT is specified, do not refresh 535 * the fsstat cache. 536 */ 537 if (mode != MNT_NOWAIT) { 538 error = VFS_STATFS(mp, sp); 539 if (error != 0) { 540 mtx_lock(&mountlist_mtx); 541 nmp = TAILQ_NEXT(mp, mnt_list); 542 vfs_unbusy(mp); 543 continue; 544 } 545 } 546 if (priv_check_cred_vfs_generation(td->td_ucred)) { 547 sptmp = malloc(sizeof(struct statfs), M_STATFS, 548 M_WAITOK); 549 *sptmp = *sp; 550 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 551 prison_enforce_statfs(td->td_ucred, mp, sptmp); 552 sp = sptmp; 553 } else 554 sptmp = NULL; 555 if (bufseg == UIO_SYSSPACE) { 556 bcopy(sp, sfsp, sizeof(*sp)); 557 free(sptmp, M_STATFS); 558 } else /* if (bufseg == UIO_USERSPACE) */ { 559 error = copyout(sp, sfsp, sizeof(*sp)); 560 free(sptmp, M_STATFS); 561 if (error != 0) { 562 vfs_unbusy(mp); 563 return (error); 564 } 565 } 566 sfsp++; 567 count++; 568 569 if (count == maxcount) { 570 vfs_unbusy(mp); 571 goto out; 572 } 573 574 mtx_lock(&mountlist_mtx); 575 nmp = TAILQ_NEXT(mp, mnt_list); 576 vfs_unbusy(mp); 577 } 578 mtx_unlock(&mountlist_mtx); 579 out: 580 *countp = count; 581 return (0); 582 } 583 584 #ifdef COMPAT_FREEBSD4 585 /* 586 * Get old format filesystem statistics. 587 */ 588 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 589 590 #ifndef _SYS_SYSPROTO_H_ 591 struct freebsd4_statfs_args { 592 char *path; 593 struct ostatfs *buf; 594 }; 595 #endif 596 int 597 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 598 { 599 struct ostatfs osb; 600 struct statfs *sfp; 601 int error; 602 603 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 604 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 605 if (error == 0) { 606 freebsd4_cvtstatfs(sfp, &osb); 607 error = copyout(&osb, uap->buf, sizeof(osb)); 608 } 609 free(sfp, M_STATFS); 610 return (error); 611 } 612 613 /* 614 * Get filesystem statistics. 615 */ 616 #ifndef _SYS_SYSPROTO_H_ 617 struct freebsd4_fstatfs_args { 618 int fd; 619 struct ostatfs *buf; 620 }; 621 #endif 622 int 623 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 624 { 625 struct ostatfs osb; 626 struct statfs *sfp; 627 int error; 628 629 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 630 error = kern_fstatfs(td, uap->fd, sfp); 631 if (error == 0) { 632 freebsd4_cvtstatfs(sfp, &osb); 633 error = copyout(&osb, uap->buf, sizeof(osb)); 634 } 635 free(sfp, M_STATFS); 636 return (error); 637 } 638 639 /* 640 * Get statistics on all filesystems. 641 */ 642 #ifndef _SYS_SYSPROTO_H_ 643 struct freebsd4_getfsstat_args { 644 struct ostatfs *buf; 645 long bufsize; 646 int mode; 647 }; 648 #endif 649 int 650 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 651 { 652 struct statfs *buf, *sp; 653 struct ostatfs osb; 654 size_t count, size; 655 int error; 656 657 if (uap->bufsize < 0) 658 return (EINVAL); 659 count = uap->bufsize / sizeof(struct ostatfs); 660 if (count > SIZE_MAX / sizeof(struct statfs)) 661 return (EINVAL); 662 size = count * sizeof(struct statfs); 663 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 664 uap->mode); 665 if (error == 0) 666 td->td_retval[0] = count; 667 if (size != 0) { 668 sp = buf; 669 while (count != 0 && error == 0) { 670 freebsd4_cvtstatfs(sp, &osb); 671 error = copyout(&osb, uap->buf, sizeof(osb)); 672 sp++; 673 uap->buf++; 674 count--; 675 } 676 free(buf, M_STATFS); 677 } 678 return (error); 679 } 680 681 /* 682 * Implement fstatfs() for (NFS) file handles. 683 */ 684 #ifndef _SYS_SYSPROTO_H_ 685 struct freebsd4_fhstatfs_args { 686 struct fhandle *u_fhp; 687 struct ostatfs *buf; 688 }; 689 #endif 690 int 691 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 692 { 693 struct ostatfs osb; 694 struct statfs *sfp; 695 fhandle_t fh; 696 int error; 697 698 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 699 if (error != 0) 700 return (error); 701 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 702 error = kern_fhstatfs(td, fh, sfp); 703 if (error == 0) { 704 freebsd4_cvtstatfs(sfp, &osb); 705 error = copyout(&osb, uap->buf, sizeof(osb)); 706 } 707 free(sfp, M_STATFS); 708 return (error); 709 } 710 711 /* 712 * Convert a new format statfs structure to an old format statfs structure. 713 */ 714 static void 715 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 716 { 717 718 statfs_scale_blocks(nsp, LONG_MAX); 719 bzero(osp, sizeof(*osp)); 720 osp->f_bsize = nsp->f_bsize; 721 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 722 osp->f_blocks = nsp->f_blocks; 723 osp->f_bfree = nsp->f_bfree; 724 osp->f_bavail = nsp->f_bavail; 725 osp->f_files = MIN(nsp->f_files, LONG_MAX); 726 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 727 osp->f_owner = nsp->f_owner; 728 osp->f_type = nsp->f_type; 729 osp->f_flags = nsp->f_flags; 730 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 731 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 732 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 733 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 734 strlcpy(osp->f_fstypename, nsp->f_fstypename, 735 MIN(MFSNAMELEN, OMFSNAMELEN)); 736 strlcpy(osp->f_mntonname, nsp->f_mntonname, 737 MIN(MNAMELEN, OMNAMELEN)); 738 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 739 MIN(MNAMELEN, OMNAMELEN)); 740 osp->f_fsid = nsp->f_fsid; 741 } 742 #endif /* COMPAT_FREEBSD4 */ 743 744 #if defined(COMPAT_FREEBSD11) 745 /* 746 * Get old format filesystem statistics. 747 */ 748 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 749 750 int 751 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 752 { 753 struct freebsd11_statfs osb; 754 struct statfs *sfp; 755 int error; 756 757 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 758 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 759 if (error == 0) { 760 freebsd11_cvtstatfs(sfp, &osb); 761 error = copyout(&osb, uap->buf, sizeof(osb)); 762 } 763 free(sfp, M_STATFS); 764 return (error); 765 } 766 767 /* 768 * Get filesystem statistics. 769 */ 770 int 771 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 772 { 773 struct freebsd11_statfs osb; 774 struct statfs *sfp; 775 int error; 776 777 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 778 error = kern_fstatfs(td, uap->fd, sfp); 779 if (error == 0) { 780 freebsd11_cvtstatfs(sfp, &osb); 781 error = copyout(&osb, uap->buf, sizeof(osb)); 782 } 783 free(sfp, M_STATFS); 784 return (error); 785 } 786 787 /* 788 * Get statistics on all filesystems. 789 */ 790 int 791 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 792 { 793 return (kern_freebsd11_getfsstat(td, uap->buf, uap->bufsize, uap->mode)); 794 } 795 796 int 797 kern_freebsd11_getfsstat(struct thread *td, struct freebsd11_statfs * ubuf, 798 long bufsize, int mode) 799 { 800 struct freebsd11_statfs osb; 801 struct statfs *buf, *sp; 802 size_t count, size; 803 int error; 804 805 if (bufsize < 0) 806 return (EINVAL); 807 808 count = bufsize / sizeof(struct ostatfs); 809 size = count * sizeof(struct statfs); 810 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, mode); 811 if (error == 0) 812 td->td_retval[0] = count; 813 if (size > 0) { 814 sp = buf; 815 while (count > 0 && error == 0) { 816 freebsd11_cvtstatfs(sp, &osb); 817 error = copyout(&osb, ubuf, sizeof(osb)); 818 sp++; 819 ubuf++; 820 count--; 821 } 822 free(buf, M_STATFS); 823 } 824 return (error); 825 } 826 827 /* 828 * Implement fstatfs() for (NFS) file handles. 829 */ 830 int 831 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 832 { 833 struct freebsd11_statfs osb; 834 struct statfs *sfp; 835 fhandle_t fh; 836 int error; 837 838 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 839 if (error) 840 return (error); 841 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 842 error = kern_fhstatfs(td, fh, sfp); 843 if (error == 0) { 844 freebsd11_cvtstatfs(sfp, &osb); 845 error = copyout(&osb, uap->buf, sizeof(osb)); 846 } 847 free(sfp, M_STATFS); 848 return (error); 849 } 850 851 /* 852 * Convert a new format statfs structure to an old format statfs structure. 853 */ 854 static void 855 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 856 { 857 858 bzero(osp, sizeof(*osp)); 859 osp->f_version = FREEBSD11_STATFS_VERSION; 860 osp->f_type = nsp->f_type; 861 osp->f_flags = nsp->f_flags; 862 osp->f_bsize = nsp->f_bsize; 863 osp->f_iosize = nsp->f_iosize; 864 osp->f_blocks = nsp->f_blocks; 865 osp->f_bfree = nsp->f_bfree; 866 osp->f_bavail = nsp->f_bavail; 867 osp->f_files = nsp->f_files; 868 osp->f_ffree = nsp->f_ffree; 869 osp->f_syncwrites = nsp->f_syncwrites; 870 osp->f_asyncwrites = nsp->f_asyncwrites; 871 osp->f_syncreads = nsp->f_syncreads; 872 osp->f_asyncreads = nsp->f_asyncreads; 873 osp->f_namemax = nsp->f_namemax; 874 osp->f_owner = nsp->f_owner; 875 osp->f_fsid = nsp->f_fsid; 876 strlcpy(osp->f_fstypename, nsp->f_fstypename, 877 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 878 strlcpy(osp->f_mntonname, nsp->f_mntonname, 879 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 880 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 881 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 882 } 883 #endif /* COMPAT_FREEBSD11 */ 884 885 /* 886 * Change current working directory to a given file descriptor. 887 */ 888 #ifndef _SYS_SYSPROTO_H_ 889 struct fchdir_args { 890 int fd; 891 }; 892 #endif 893 int 894 sys_fchdir(struct thread *td, struct fchdir_args *uap) 895 { 896 struct vnode *vp, *tdp; 897 struct mount *mp; 898 struct file *fp; 899 int error; 900 901 AUDIT_ARG_FD(uap->fd); 902 error = getvnode_path(td, uap->fd, &cap_fchdir_rights, 903 &fp); 904 if (error != 0) 905 return (error); 906 vp = fp->f_vnode; 907 vref(vp); 908 fdrop(fp, td); 909 vn_lock(vp, LK_SHARED | LK_RETRY); 910 AUDIT_ARG_VNODE1(vp); 911 error = change_dir(vp, td); 912 while (!error && (mp = vp->v_mountedhere) != NULL) { 913 if (vfs_busy(mp, 0)) 914 continue; 915 error = VFS_ROOT(mp, LK_SHARED, &tdp); 916 vfs_unbusy(mp); 917 if (error != 0) 918 break; 919 vput(vp); 920 vp = tdp; 921 } 922 if (error != 0) { 923 vput(vp); 924 return (error); 925 } 926 VOP_UNLOCK(vp); 927 pwd_chdir(td, vp); 928 return (0); 929 } 930 931 /* 932 * Change current working directory (``.''). 933 */ 934 #ifndef _SYS_SYSPROTO_H_ 935 struct chdir_args { 936 char *path; 937 }; 938 #endif 939 int 940 sys_chdir(struct thread *td, struct chdir_args *uap) 941 { 942 943 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 944 } 945 946 int 947 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg) 948 { 949 struct nameidata nd; 950 int error; 951 952 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 953 pathseg, path, td); 954 if ((error = namei(&nd)) != 0) 955 return (error); 956 if ((error = change_dir(nd.ni_vp, td)) != 0) { 957 vput(nd.ni_vp); 958 NDFREE_NOTHING(&nd); 959 return (error); 960 } 961 VOP_UNLOCK(nd.ni_vp); 962 NDFREE_NOTHING(&nd); 963 pwd_chdir(td, nd.ni_vp); 964 return (0); 965 } 966 967 static int unprivileged_chroot = 0; 968 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_chroot, CTLFLAG_RW, 969 &unprivileged_chroot, 0, 970 "Unprivileged processes can use chroot(2)"); 971 /* 972 * Change notion of root (``/'') directory. 973 */ 974 #ifndef _SYS_SYSPROTO_H_ 975 struct chroot_args { 976 char *path; 977 }; 978 #endif 979 int 980 sys_chroot(struct thread *td, struct chroot_args *uap) 981 { 982 struct nameidata nd; 983 struct proc *p; 984 int error; 985 986 error = priv_check(td, PRIV_VFS_CHROOT); 987 if (error != 0) { 988 p = td->td_proc; 989 PROC_LOCK(p); 990 if (unprivileged_chroot == 0 || 991 (p->p_flag2 & P2_NO_NEW_PRIVS) == 0) { 992 PROC_UNLOCK(p); 993 return (error); 994 } 995 PROC_UNLOCK(p); 996 } 997 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 998 UIO_USERSPACE, uap->path, td); 999 error = namei(&nd); 1000 if (error != 0) 1001 goto error; 1002 error = change_dir(nd.ni_vp, td); 1003 if (error != 0) 1004 goto e_vunlock; 1005 #ifdef MAC 1006 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 1007 if (error != 0) 1008 goto e_vunlock; 1009 #endif 1010 VOP_UNLOCK(nd.ni_vp); 1011 error = pwd_chroot(td, nd.ni_vp); 1012 vrele(nd.ni_vp); 1013 NDFREE_NOTHING(&nd); 1014 return (error); 1015 e_vunlock: 1016 vput(nd.ni_vp); 1017 error: 1018 NDFREE_NOTHING(&nd); 1019 return (error); 1020 } 1021 1022 /* 1023 * Common routine for chroot and chdir. Callers must provide a locked vnode 1024 * instance. 1025 */ 1026 int 1027 change_dir(struct vnode *vp, struct thread *td) 1028 { 1029 #ifdef MAC 1030 int error; 1031 #endif 1032 1033 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 1034 if (vp->v_type != VDIR) 1035 return (ENOTDIR); 1036 #ifdef MAC 1037 error = mac_vnode_check_chdir(td->td_ucred, vp); 1038 if (error != 0) 1039 return (error); 1040 #endif 1041 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 1042 } 1043 1044 static __inline void 1045 flags_to_rights(int flags, cap_rights_t *rightsp) 1046 { 1047 if (flags & O_EXEC) { 1048 cap_rights_set_one(rightsp, CAP_FEXECVE); 1049 if (flags & O_PATH) 1050 return; 1051 } else { 1052 switch ((flags & O_ACCMODE)) { 1053 case O_RDONLY: 1054 cap_rights_set_one(rightsp, CAP_READ); 1055 break; 1056 case O_RDWR: 1057 cap_rights_set_one(rightsp, CAP_READ); 1058 /* FALLTHROUGH */ 1059 case O_WRONLY: 1060 cap_rights_set_one(rightsp, CAP_WRITE); 1061 if (!(flags & (O_APPEND | O_TRUNC))) 1062 cap_rights_set_one(rightsp, CAP_SEEK); 1063 break; 1064 } 1065 } 1066 1067 if (flags & O_CREAT) 1068 cap_rights_set_one(rightsp, CAP_CREATE); 1069 1070 if (flags & O_TRUNC) 1071 cap_rights_set_one(rightsp, CAP_FTRUNCATE); 1072 1073 if (flags & (O_SYNC | O_FSYNC)) 1074 cap_rights_set_one(rightsp, CAP_FSYNC); 1075 1076 if (flags & (O_EXLOCK | O_SHLOCK)) 1077 cap_rights_set_one(rightsp, CAP_FLOCK); 1078 } 1079 1080 /* 1081 * Check permissions, allocate an open file structure, and call the device 1082 * open routine if any. 1083 */ 1084 #ifndef _SYS_SYSPROTO_H_ 1085 struct open_args { 1086 char *path; 1087 int flags; 1088 int mode; 1089 }; 1090 #endif 1091 int 1092 sys_open(struct thread *td, struct open_args *uap) 1093 { 1094 1095 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1096 uap->flags, uap->mode)); 1097 } 1098 1099 #ifndef _SYS_SYSPROTO_H_ 1100 struct openat_args { 1101 int fd; 1102 char *path; 1103 int flag; 1104 int mode; 1105 }; 1106 #endif 1107 int 1108 sys_openat(struct thread *td, struct openat_args *uap) 1109 { 1110 1111 AUDIT_ARG_FD(uap->fd); 1112 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1113 uap->mode)); 1114 } 1115 1116 int 1117 kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1118 int flags, int mode) 1119 { 1120 struct proc *p = td->td_proc; 1121 struct filedesc *fdp; 1122 struct pwddesc *pdp; 1123 struct file *fp; 1124 struct vnode *vp; 1125 struct nameidata nd; 1126 cap_rights_t rights; 1127 int cmode, error, indx; 1128 1129 indx = -1; 1130 fdp = p->p_fd; 1131 pdp = p->p_pd; 1132 1133 AUDIT_ARG_FFLAGS(flags); 1134 AUDIT_ARG_MODE(mode); 1135 cap_rights_init_one(&rights, CAP_LOOKUP); 1136 flags_to_rights(flags, &rights); 1137 1138 /* 1139 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1140 * may be specified. On the other hand, for O_PATH any mode 1141 * except O_EXEC is ignored. 1142 */ 1143 if ((flags & O_PATH) != 0) { 1144 flags &= ~(O_CREAT | O_ACCMODE); 1145 } else if ((flags & O_EXEC) != 0) { 1146 if (flags & O_ACCMODE) 1147 return (EINVAL); 1148 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1149 return (EINVAL); 1150 } else { 1151 flags = FFLAGS(flags); 1152 } 1153 1154 /* 1155 * Allocate a file structure. The descriptor to reference it 1156 * is allocated and used by finstall_refed() below. 1157 */ 1158 error = falloc_noinstall(td, &fp); 1159 if (error != 0) 1160 return (error); 1161 /* Set the flags early so the finit in devfs can pick them up. */ 1162 fp->f_flag = flags & FMASK; 1163 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT; 1164 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1165 &rights, td); 1166 td->td_dupfd = -1; /* XXX check for fdopen */ 1167 error = vn_open(&nd, &flags, cmode, fp); 1168 if (error != 0) { 1169 /* 1170 * If the vn_open replaced the method vector, something 1171 * wonderous happened deep below and we just pass it up 1172 * pretending we know what we do. 1173 */ 1174 if (error == ENXIO && fp->f_ops != &badfileops) { 1175 MPASS((flags & O_PATH) == 0); 1176 goto success; 1177 } 1178 1179 /* 1180 * Handle special fdopen() case. bleh. 1181 * 1182 * Don't do this for relative (capability) lookups; we don't 1183 * understand exactly what would happen, and we don't think 1184 * that it ever should. 1185 */ 1186 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 && 1187 (error == ENODEV || error == ENXIO) && 1188 td->td_dupfd >= 0) { 1189 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1190 &indx); 1191 if (error == 0) 1192 goto success; 1193 } 1194 1195 goto bad; 1196 } 1197 td->td_dupfd = 0; 1198 NDFREE(&nd, NDF_ONLY_PNBUF); 1199 vp = nd.ni_vp; 1200 1201 /* 1202 * Store the vnode, for any f_type. Typically, the vnode use 1203 * count is decremented by direct call to vn_closefile() for 1204 * files that switched type in the cdevsw fdopen() method. 1205 */ 1206 fp->f_vnode = vp; 1207 1208 /* 1209 * If the file wasn't claimed by devfs bind it to the normal 1210 * vnode operations here. 1211 */ 1212 if (fp->f_ops == &badfileops) { 1213 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0, 1214 ("Unexpected fifo fp %p vp %p", fp, vp)); 1215 if ((flags & O_PATH) != 0) { 1216 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED), 1217 DTYPE_VNODE, NULL, &path_fileops); 1218 vhold(vp); 1219 vunref(vp); 1220 } else { 1221 finit_vnode(fp, flags, NULL, &vnops); 1222 } 1223 } 1224 1225 VOP_UNLOCK(vp); 1226 if (flags & O_TRUNC) { 1227 error = fo_truncate(fp, 0, td->td_ucred, td); 1228 if (error != 0) 1229 goto bad; 1230 } 1231 success: 1232 /* 1233 * If we haven't already installed the FD (for dupfdopen), do so now. 1234 */ 1235 if (indx == -1) { 1236 struct filecaps *fcaps; 1237 1238 #ifdef CAPABILITIES 1239 if ((nd.ni_resflags & NIRES_STRICTREL) != 0) 1240 fcaps = &nd.ni_filecaps; 1241 else 1242 #endif 1243 fcaps = NULL; 1244 error = finstall_refed(td, fp, &indx, flags, fcaps); 1245 /* On success finstall_refed() consumes fcaps. */ 1246 if (error != 0) { 1247 filecaps_free(&nd.ni_filecaps); 1248 goto bad; 1249 } 1250 } else { 1251 filecaps_free(&nd.ni_filecaps); 1252 falloc_abort(td, fp); 1253 } 1254 1255 td->td_retval[0] = indx; 1256 return (0); 1257 bad: 1258 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1259 falloc_abort(td, fp); 1260 return (error); 1261 } 1262 1263 #ifdef COMPAT_43 1264 /* 1265 * Create a file. 1266 */ 1267 #ifndef _SYS_SYSPROTO_H_ 1268 struct ocreat_args { 1269 char *path; 1270 int mode; 1271 }; 1272 #endif 1273 int 1274 ocreat(struct thread *td, struct ocreat_args *uap) 1275 { 1276 1277 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1278 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1279 } 1280 #endif /* COMPAT_43 */ 1281 1282 /* 1283 * Create a special file. 1284 */ 1285 #ifndef _SYS_SYSPROTO_H_ 1286 struct mknodat_args { 1287 int fd; 1288 char *path; 1289 mode_t mode; 1290 dev_t dev; 1291 }; 1292 #endif 1293 int 1294 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1295 { 1296 1297 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1298 uap->dev)); 1299 } 1300 1301 #if defined(COMPAT_FREEBSD11) 1302 int 1303 freebsd11_mknod(struct thread *td, 1304 struct freebsd11_mknod_args *uap) 1305 { 1306 1307 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1308 uap->mode, uap->dev)); 1309 } 1310 1311 int 1312 freebsd11_mknodat(struct thread *td, 1313 struct freebsd11_mknodat_args *uap) 1314 { 1315 1316 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1317 uap->dev)); 1318 } 1319 #endif /* COMPAT_FREEBSD11 */ 1320 1321 int 1322 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1323 int mode, dev_t dev) 1324 { 1325 struct vnode *vp; 1326 struct mount *mp; 1327 struct vattr vattr; 1328 struct nameidata nd; 1329 int error, whiteout = 0; 1330 1331 AUDIT_ARG_MODE(mode); 1332 AUDIT_ARG_DEV(dev); 1333 switch (mode & S_IFMT) { 1334 case S_IFCHR: 1335 case S_IFBLK: 1336 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1337 if (error == 0 && dev == VNOVAL) 1338 error = EINVAL; 1339 break; 1340 case S_IFWHT: 1341 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1342 break; 1343 case S_IFIFO: 1344 if (dev == 0) 1345 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1346 /* FALLTHROUGH */ 1347 default: 1348 error = EINVAL; 1349 break; 1350 } 1351 if (error != 0) 1352 return (error); 1353 NDPREINIT(&nd); 1354 restart: 1355 bwillwrite(); 1356 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1357 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1358 td); 1359 if ((error = namei(&nd)) != 0) 1360 return (error); 1361 vp = nd.ni_vp; 1362 if (vp != NULL) { 1363 NDFREE(&nd, NDF_ONLY_PNBUF); 1364 if (vp == nd.ni_dvp) 1365 vrele(nd.ni_dvp); 1366 else 1367 vput(nd.ni_dvp); 1368 vrele(vp); 1369 return (EEXIST); 1370 } else { 1371 VATTR_NULL(&vattr); 1372 vattr.va_mode = (mode & ALLPERMS) & 1373 ~td->td_proc->p_pd->pd_cmask; 1374 vattr.va_rdev = dev; 1375 whiteout = 0; 1376 1377 switch (mode & S_IFMT) { 1378 case S_IFCHR: 1379 vattr.va_type = VCHR; 1380 break; 1381 case S_IFBLK: 1382 vattr.va_type = VBLK; 1383 break; 1384 case S_IFWHT: 1385 whiteout = 1; 1386 break; 1387 default: 1388 panic("kern_mknod: invalid mode"); 1389 } 1390 } 1391 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1392 NDFREE(&nd, NDF_ONLY_PNBUF); 1393 vput(nd.ni_dvp); 1394 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1395 return (error); 1396 goto restart; 1397 } 1398 #ifdef MAC 1399 if (error == 0 && !whiteout) 1400 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1401 &nd.ni_cnd, &vattr); 1402 #endif 1403 if (error == 0) { 1404 if (whiteout) 1405 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1406 else { 1407 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1408 &nd.ni_cnd, &vattr); 1409 } 1410 } 1411 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL, 1412 true); 1413 vn_finished_write(mp); 1414 NDFREE(&nd, NDF_ONLY_PNBUF); 1415 if (error == ERELOOKUP) 1416 goto restart; 1417 return (error); 1418 } 1419 1420 /* 1421 * Create a named pipe. 1422 */ 1423 #ifndef _SYS_SYSPROTO_H_ 1424 struct mkfifo_args { 1425 char *path; 1426 int mode; 1427 }; 1428 #endif 1429 int 1430 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1431 { 1432 1433 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1434 uap->mode)); 1435 } 1436 1437 #ifndef _SYS_SYSPROTO_H_ 1438 struct mkfifoat_args { 1439 int fd; 1440 char *path; 1441 mode_t mode; 1442 }; 1443 #endif 1444 int 1445 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1446 { 1447 1448 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1449 uap->mode)); 1450 } 1451 1452 int 1453 kern_mkfifoat(struct thread *td, int fd, const char *path, 1454 enum uio_seg pathseg, int mode) 1455 { 1456 struct mount *mp; 1457 struct vattr vattr; 1458 struct nameidata nd; 1459 int error; 1460 1461 AUDIT_ARG_MODE(mode); 1462 NDPREINIT(&nd); 1463 restart: 1464 bwillwrite(); 1465 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1466 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1467 td); 1468 if ((error = namei(&nd)) != 0) 1469 return (error); 1470 if (nd.ni_vp != NULL) { 1471 NDFREE(&nd, NDF_ONLY_PNBUF); 1472 if (nd.ni_vp == nd.ni_dvp) 1473 vrele(nd.ni_dvp); 1474 else 1475 vput(nd.ni_dvp); 1476 vrele(nd.ni_vp); 1477 return (EEXIST); 1478 } 1479 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1480 NDFREE(&nd, NDF_ONLY_PNBUF); 1481 vput(nd.ni_dvp); 1482 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1483 return (error); 1484 goto restart; 1485 } 1486 VATTR_NULL(&vattr); 1487 vattr.va_type = VFIFO; 1488 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask; 1489 #ifdef MAC 1490 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1491 &vattr); 1492 if (error != 0) 1493 goto out; 1494 #endif 1495 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1496 #ifdef MAC 1497 out: 1498 #endif 1499 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1500 vn_finished_write(mp); 1501 NDFREE(&nd, NDF_ONLY_PNBUF); 1502 if (error == ERELOOKUP) 1503 goto restart; 1504 return (error); 1505 } 1506 1507 /* 1508 * Make a hard file link. 1509 */ 1510 #ifndef _SYS_SYSPROTO_H_ 1511 struct link_args { 1512 char *path; 1513 char *link; 1514 }; 1515 #endif 1516 int 1517 sys_link(struct thread *td, struct link_args *uap) 1518 { 1519 1520 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1521 UIO_USERSPACE, AT_SYMLINK_FOLLOW)); 1522 } 1523 1524 #ifndef _SYS_SYSPROTO_H_ 1525 struct linkat_args { 1526 int fd1; 1527 char *path1; 1528 int fd2; 1529 char *path2; 1530 int flag; 1531 }; 1532 #endif 1533 int 1534 sys_linkat(struct thread *td, struct linkat_args *uap) 1535 { 1536 1537 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1538 UIO_USERSPACE, uap->flag)); 1539 } 1540 1541 int hardlink_check_uid = 0; 1542 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1543 &hardlink_check_uid, 0, 1544 "Unprivileged processes cannot create hard links to files owned by other " 1545 "users"); 1546 static int hardlink_check_gid = 0; 1547 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1548 &hardlink_check_gid, 0, 1549 "Unprivileged processes cannot create hard links to files owned by other " 1550 "groups"); 1551 1552 static int 1553 can_hardlink(struct vnode *vp, struct ucred *cred) 1554 { 1555 struct vattr va; 1556 int error; 1557 1558 if (!hardlink_check_uid && !hardlink_check_gid) 1559 return (0); 1560 1561 error = VOP_GETATTR(vp, &va, cred); 1562 if (error != 0) 1563 return (error); 1564 1565 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1566 error = priv_check_cred(cred, PRIV_VFS_LINK); 1567 if (error != 0) 1568 return (error); 1569 } 1570 1571 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1572 error = priv_check_cred(cred, PRIV_VFS_LINK); 1573 if (error != 0) 1574 return (error); 1575 } 1576 1577 return (0); 1578 } 1579 1580 int 1581 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1582 const char *path2, enum uio_seg segflag, int flag) 1583 { 1584 struct nameidata nd; 1585 int error; 1586 1587 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | 1588 AT_EMPTY_PATH)) != 0) 1589 return (EINVAL); 1590 1591 NDPREINIT(&nd); 1592 do { 1593 bwillwrite(); 1594 NDINIT_ATRIGHTS(&nd, LOOKUP, AUDITVNODE1 | at2cnpflags(flag, 1595 AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | AT_EMPTY_PATH), 1596 segflag, path1, fd1, &cap_linkat_source_rights, td); 1597 if ((error = namei(&nd)) != 0) 1598 return (error); 1599 NDFREE(&nd, NDF_ONLY_PNBUF); 1600 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) { 1601 error = priv_check(td, PRIV_VFS_FHOPEN); 1602 if (error != 0) { 1603 vrele(nd.ni_vp); 1604 return (error); 1605 } 1606 } 1607 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1608 } while (error == EAGAIN || error == ERELOOKUP); 1609 return (error); 1610 } 1611 1612 static int 1613 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1614 enum uio_seg segflag) 1615 { 1616 struct nameidata nd; 1617 struct mount *mp; 1618 int error; 1619 1620 if (vp->v_type == VDIR) { 1621 vrele(vp); 1622 return (EPERM); /* POSIX */ 1623 } 1624 NDINIT_ATRIGHTS(&nd, CREATE, 1625 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1626 &cap_linkat_target_rights, td); 1627 if ((error = namei(&nd)) == 0) { 1628 if (nd.ni_vp != NULL) { 1629 NDFREE(&nd, NDF_ONLY_PNBUF); 1630 if (nd.ni_dvp == nd.ni_vp) 1631 vrele(nd.ni_dvp); 1632 else 1633 vput(nd.ni_dvp); 1634 vrele(nd.ni_vp); 1635 vrele(vp); 1636 return (EEXIST); 1637 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1638 /* 1639 * Cross-device link. No need to recheck 1640 * vp->v_type, since it cannot change, except 1641 * to VBAD. 1642 */ 1643 NDFREE(&nd, NDF_ONLY_PNBUF); 1644 vput(nd.ni_dvp); 1645 vrele(vp); 1646 return (EXDEV); 1647 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1648 error = can_hardlink(vp, td->td_ucred); 1649 #ifdef MAC 1650 if (error == 0) 1651 error = mac_vnode_check_link(td->td_ucred, 1652 nd.ni_dvp, vp, &nd.ni_cnd); 1653 #endif 1654 if (error != 0) { 1655 vput(vp); 1656 vput(nd.ni_dvp); 1657 NDFREE(&nd, NDF_ONLY_PNBUF); 1658 return (error); 1659 } 1660 error = vn_start_write(vp, &mp, V_NOWAIT); 1661 if (error != 0) { 1662 vput(vp); 1663 vput(nd.ni_dvp); 1664 NDFREE(&nd, NDF_ONLY_PNBUF); 1665 error = vn_start_write(NULL, &mp, 1666 V_XSLEEP | PCATCH); 1667 if (error != 0) 1668 return (error); 1669 return (EAGAIN); 1670 } 1671 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1672 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true); 1673 vn_finished_write(mp); 1674 NDFREE(&nd, NDF_ONLY_PNBUF); 1675 vp = NULL; 1676 } else { 1677 vput(nd.ni_dvp); 1678 NDFREE(&nd, NDF_ONLY_PNBUF); 1679 vrele(vp); 1680 return (EAGAIN); 1681 } 1682 } 1683 if (vp != NULL) 1684 vrele(vp); 1685 return (error); 1686 } 1687 1688 /* 1689 * Make a symbolic link. 1690 */ 1691 #ifndef _SYS_SYSPROTO_H_ 1692 struct symlink_args { 1693 char *path; 1694 char *link; 1695 }; 1696 #endif 1697 int 1698 sys_symlink(struct thread *td, struct symlink_args *uap) 1699 { 1700 1701 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1702 UIO_USERSPACE)); 1703 } 1704 1705 #ifndef _SYS_SYSPROTO_H_ 1706 struct symlinkat_args { 1707 char *path; 1708 int fd; 1709 char *path2; 1710 }; 1711 #endif 1712 int 1713 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1714 { 1715 1716 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1717 UIO_USERSPACE)); 1718 } 1719 1720 int 1721 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1722 enum uio_seg segflg) 1723 { 1724 struct mount *mp; 1725 struct vattr vattr; 1726 const char *syspath; 1727 char *tmppath; 1728 struct nameidata nd; 1729 int error; 1730 1731 if (segflg == UIO_SYSSPACE) { 1732 syspath = path1; 1733 } else { 1734 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1735 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1736 goto out; 1737 syspath = tmppath; 1738 } 1739 AUDIT_ARG_TEXT(syspath); 1740 NDPREINIT(&nd); 1741 restart: 1742 bwillwrite(); 1743 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1744 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1745 td); 1746 if ((error = namei(&nd)) != 0) 1747 goto out; 1748 if (nd.ni_vp) { 1749 NDFREE(&nd, NDF_ONLY_PNBUF); 1750 if (nd.ni_vp == nd.ni_dvp) 1751 vrele(nd.ni_dvp); 1752 else 1753 vput(nd.ni_dvp); 1754 vrele(nd.ni_vp); 1755 nd.ni_vp = NULL; 1756 error = EEXIST; 1757 goto out; 1758 } 1759 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1760 NDFREE(&nd, NDF_ONLY_PNBUF); 1761 vput(nd.ni_dvp); 1762 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1763 goto out; 1764 goto restart; 1765 } 1766 VATTR_NULL(&vattr); 1767 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask; 1768 #ifdef MAC 1769 vattr.va_type = VLNK; 1770 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1771 &vattr); 1772 if (error != 0) 1773 goto out2; 1774 #endif 1775 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1776 #ifdef MAC 1777 out2: 1778 #endif 1779 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1780 vn_finished_write(mp); 1781 NDFREE(&nd, NDF_ONLY_PNBUF); 1782 if (error == ERELOOKUP) 1783 goto restart; 1784 out: 1785 if (segflg != UIO_SYSSPACE) 1786 uma_zfree(namei_zone, tmppath); 1787 return (error); 1788 } 1789 1790 /* 1791 * Delete a whiteout from the filesystem. 1792 */ 1793 #ifndef _SYS_SYSPROTO_H_ 1794 struct undelete_args { 1795 char *path; 1796 }; 1797 #endif 1798 int 1799 sys_undelete(struct thread *td, struct undelete_args *uap) 1800 { 1801 struct mount *mp; 1802 struct nameidata nd; 1803 int error; 1804 1805 NDPREINIT(&nd); 1806 restart: 1807 bwillwrite(); 1808 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1809 UIO_USERSPACE, uap->path, td); 1810 error = namei(&nd); 1811 if (error != 0) 1812 return (error); 1813 1814 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1815 NDFREE(&nd, NDF_ONLY_PNBUF); 1816 if (nd.ni_vp == nd.ni_dvp) 1817 vrele(nd.ni_dvp); 1818 else 1819 vput(nd.ni_dvp); 1820 if (nd.ni_vp) 1821 vrele(nd.ni_vp); 1822 return (EEXIST); 1823 } 1824 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1825 NDFREE(&nd, NDF_ONLY_PNBUF); 1826 vput(nd.ni_dvp); 1827 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1828 return (error); 1829 goto restart; 1830 } 1831 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1832 NDFREE(&nd, NDF_ONLY_PNBUF); 1833 vput(nd.ni_dvp); 1834 vn_finished_write(mp); 1835 if (error == ERELOOKUP) 1836 goto restart; 1837 return (error); 1838 } 1839 1840 /* 1841 * Delete a name from the filesystem. 1842 */ 1843 #ifndef _SYS_SYSPROTO_H_ 1844 struct unlink_args { 1845 char *path; 1846 }; 1847 #endif 1848 int 1849 sys_unlink(struct thread *td, struct unlink_args *uap) 1850 { 1851 1852 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1853 0, 0)); 1854 } 1855 1856 static int 1857 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1858 int flag, enum uio_seg pathseg, ino_t oldinum) 1859 { 1860 1861 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0) 1862 return (EINVAL); 1863 1864 if ((flag & AT_REMOVEDIR) != 0) 1865 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1866 1867 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1868 } 1869 1870 #ifndef _SYS_SYSPROTO_H_ 1871 struct unlinkat_args { 1872 int fd; 1873 char *path; 1874 int flag; 1875 }; 1876 #endif 1877 int 1878 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1879 { 1880 1881 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1882 UIO_USERSPACE, 0)); 1883 } 1884 1885 #ifndef _SYS_SYSPROTO_H_ 1886 struct funlinkat_args { 1887 int dfd; 1888 const char *path; 1889 int fd; 1890 int flag; 1891 }; 1892 #endif 1893 int 1894 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 1895 { 1896 1897 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 1898 UIO_USERSPACE, 0)); 1899 } 1900 1901 int 1902 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 1903 enum uio_seg pathseg, int flag, ino_t oldinum) 1904 { 1905 struct mount *mp; 1906 struct file *fp; 1907 struct vnode *vp; 1908 struct nameidata nd; 1909 struct stat sb; 1910 int error; 1911 1912 fp = NULL; 1913 if (fd != FD_NONE) { 1914 error = getvnode_path(td, fd, &cap_no_rights, &fp); 1915 if (error != 0) 1916 return (error); 1917 } 1918 1919 NDPREINIT(&nd); 1920 restart: 1921 bwillwrite(); 1922 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1923 at2cnpflags(flag, AT_RESOLVE_BENEATH), 1924 pathseg, path, dfd, &cap_unlinkat_rights, td); 1925 if ((error = namei(&nd)) != 0) { 1926 if (error == EINVAL) 1927 error = EPERM; 1928 goto fdout; 1929 } 1930 vp = nd.ni_vp; 1931 if (vp->v_type == VDIR && oldinum == 0) { 1932 error = EPERM; /* POSIX */ 1933 } else if (oldinum != 0 && 1934 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED)) == 0) && 1935 sb.st_ino != oldinum) { 1936 error = EIDRM; /* Identifier removed */ 1937 } else if (fp != NULL && fp->f_vnode != vp) { 1938 if (VN_IS_DOOMED(fp->f_vnode)) 1939 error = EBADF; 1940 else 1941 error = EDEADLK; 1942 } else { 1943 /* 1944 * The root of a mounted filesystem cannot be deleted. 1945 * 1946 * XXX: can this only be a VDIR case? 1947 */ 1948 if (vp->v_vflag & VV_ROOT) 1949 error = EBUSY; 1950 } 1951 if (error == 0) { 1952 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1953 NDFREE(&nd, NDF_ONLY_PNBUF); 1954 vput(nd.ni_dvp); 1955 if (vp == nd.ni_dvp) 1956 vrele(vp); 1957 else 1958 vput(vp); 1959 if ((error = vn_start_write(NULL, &mp, 1960 V_XSLEEP | PCATCH)) != 0) { 1961 goto fdout; 1962 } 1963 goto restart; 1964 } 1965 #ifdef MAC 1966 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1967 &nd.ni_cnd); 1968 if (error != 0) 1969 goto out; 1970 #endif 1971 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1972 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1973 #ifdef MAC 1974 out: 1975 #endif 1976 vn_finished_write(mp); 1977 } 1978 NDFREE(&nd, NDF_ONLY_PNBUF); 1979 vput(nd.ni_dvp); 1980 if (vp == nd.ni_dvp) 1981 vrele(vp); 1982 else 1983 vput(vp); 1984 if (error == ERELOOKUP) 1985 goto restart; 1986 fdout: 1987 if (fp != NULL) 1988 fdrop(fp, td); 1989 return (error); 1990 } 1991 1992 /* 1993 * Reposition read/write file offset. 1994 */ 1995 #ifndef _SYS_SYSPROTO_H_ 1996 struct lseek_args { 1997 int fd; 1998 int pad; 1999 off_t offset; 2000 int whence; 2001 }; 2002 #endif 2003 int 2004 sys_lseek(struct thread *td, struct lseek_args *uap) 2005 { 2006 2007 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2008 } 2009 2010 int 2011 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 2012 { 2013 struct file *fp; 2014 int error; 2015 2016 AUDIT_ARG_FD(fd); 2017 error = fget(td, fd, &cap_seek_rights, &fp); 2018 if (error != 0) 2019 return (error); 2020 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 2021 fo_seek(fp, offset, whence, td) : ESPIPE; 2022 fdrop(fp, td); 2023 return (error); 2024 } 2025 2026 #if defined(COMPAT_43) 2027 /* 2028 * Reposition read/write file offset. 2029 */ 2030 #ifndef _SYS_SYSPROTO_H_ 2031 struct olseek_args { 2032 int fd; 2033 long offset; 2034 int whence; 2035 }; 2036 #endif 2037 int 2038 olseek(struct thread *td, struct olseek_args *uap) 2039 { 2040 2041 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2042 } 2043 #endif /* COMPAT_43 */ 2044 2045 #if defined(COMPAT_FREEBSD6) 2046 /* Version with the 'pad' argument */ 2047 int 2048 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 2049 { 2050 2051 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2052 } 2053 #endif 2054 2055 /* 2056 * Check access permissions using passed credentials. 2057 */ 2058 static int 2059 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 2060 struct thread *td) 2061 { 2062 accmode_t accmode; 2063 int error; 2064 2065 /* Flags == 0 means only check for existence. */ 2066 if (user_flags == 0) 2067 return (0); 2068 2069 accmode = 0; 2070 if (user_flags & R_OK) 2071 accmode |= VREAD; 2072 if (user_flags & W_OK) 2073 accmode |= VWRITE; 2074 if (user_flags & X_OK) 2075 accmode |= VEXEC; 2076 #ifdef MAC 2077 error = mac_vnode_check_access(cred, vp, accmode); 2078 if (error != 0) 2079 return (error); 2080 #endif 2081 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 2082 error = VOP_ACCESS(vp, accmode, cred, td); 2083 return (error); 2084 } 2085 2086 /* 2087 * Check access permissions using "real" credentials. 2088 */ 2089 #ifndef _SYS_SYSPROTO_H_ 2090 struct access_args { 2091 char *path; 2092 int amode; 2093 }; 2094 #endif 2095 int 2096 sys_access(struct thread *td, struct access_args *uap) 2097 { 2098 2099 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2100 0, uap->amode)); 2101 } 2102 2103 #ifndef _SYS_SYSPROTO_H_ 2104 struct faccessat_args { 2105 int dirfd; 2106 char *path; 2107 int amode; 2108 int flag; 2109 } 2110 #endif 2111 int 2112 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2113 { 2114 2115 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2116 uap->amode)); 2117 } 2118 2119 int 2120 kern_accessat(struct thread *td, int fd, const char *path, 2121 enum uio_seg pathseg, int flag, int amode) 2122 { 2123 struct ucred *cred, *usecred; 2124 struct vnode *vp; 2125 struct nameidata nd; 2126 int error; 2127 2128 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH)) != 0) 2129 return (EINVAL); 2130 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2131 return (EINVAL); 2132 2133 /* 2134 * Create and modify a temporary credential instead of one that 2135 * is potentially shared (if we need one). 2136 */ 2137 cred = td->td_ucred; 2138 if ((flag & AT_EACCESS) == 0 && 2139 ((cred->cr_uid != cred->cr_ruid || 2140 cred->cr_rgid != cred->cr_groups[0]))) { 2141 usecred = crdup(cred); 2142 usecred->cr_uid = cred->cr_ruid; 2143 usecred->cr_groups[0] = cred->cr_rgid; 2144 td->td_ucred = usecred; 2145 } else 2146 usecred = cred; 2147 AUDIT_ARG_VALUE(amode); 2148 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2149 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | 2150 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights, td); 2151 if ((error = namei(&nd)) != 0) 2152 goto out; 2153 vp = nd.ni_vp; 2154 2155 error = vn_access(vp, amode, usecred, td); 2156 NDFREE_NOTHING(&nd); 2157 vput(vp); 2158 out: 2159 if (usecred != cred) { 2160 td->td_ucred = cred; 2161 crfree(usecred); 2162 } 2163 return (error); 2164 } 2165 2166 /* 2167 * Check access permissions using "effective" credentials. 2168 */ 2169 #ifndef _SYS_SYSPROTO_H_ 2170 struct eaccess_args { 2171 char *path; 2172 int amode; 2173 }; 2174 #endif 2175 int 2176 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2177 { 2178 2179 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2180 AT_EACCESS, uap->amode)); 2181 } 2182 2183 #if defined(COMPAT_43) 2184 /* 2185 * Get file status; this version follows links. 2186 */ 2187 #ifndef _SYS_SYSPROTO_H_ 2188 struct ostat_args { 2189 char *path; 2190 struct ostat *ub; 2191 }; 2192 #endif 2193 int 2194 ostat(struct thread *td, struct ostat_args *uap) 2195 { 2196 struct stat sb; 2197 struct ostat osb; 2198 int error; 2199 2200 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2201 &sb, NULL); 2202 if (error != 0) 2203 return (error); 2204 cvtstat(&sb, &osb); 2205 return (copyout(&osb, uap->ub, sizeof (osb))); 2206 } 2207 2208 /* 2209 * Get file status; this version does not follow links. 2210 */ 2211 #ifndef _SYS_SYSPROTO_H_ 2212 struct olstat_args { 2213 char *path; 2214 struct ostat *ub; 2215 }; 2216 #endif 2217 int 2218 olstat(struct thread *td, struct olstat_args *uap) 2219 { 2220 struct stat sb; 2221 struct ostat osb; 2222 int error; 2223 2224 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2225 UIO_USERSPACE, &sb, NULL); 2226 if (error != 0) 2227 return (error); 2228 cvtstat(&sb, &osb); 2229 return (copyout(&osb, uap->ub, sizeof (osb))); 2230 } 2231 2232 /* 2233 * Convert from an old to a new stat structure. 2234 * XXX: many values are blindly truncated. 2235 */ 2236 void 2237 cvtstat(struct stat *st, struct ostat *ost) 2238 { 2239 2240 bzero(ost, sizeof(*ost)); 2241 ost->st_dev = st->st_dev; 2242 ost->st_ino = st->st_ino; 2243 ost->st_mode = st->st_mode; 2244 ost->st_nlink = st->st_nlink; 2245 ost->st_uid = st->st_uid; 2246 ost->st_gid = st->st_gid; 2247 ost->st_rdev = st->st_rdev; 2248 ost->st_size = MIN(st->st_size, INT32_MAX); 2249 ost->st_atim = st->st_atim; 2250 ost->st_mtim = st->st_mtim; 2251 ost->st_ctim = st->st_ctim; 2252 ost->st_blksize = st->st_blksize; 2253 ost->st_blocks = st->st_blocks; 2254 ost->st_flags = st->st_flags; 2255 ost->st_gen = st->st_gen; 2256 } 2257 #endif /* COMPAT_43 */ 2258 2259 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2260 int ino64_trunc_error; 2261 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2262 &ino64_trunc_error, 0, 2263 "Error on truncation of device, file or inode number, or link count"); 2264 2265 int 2266 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2267 { 2268 2269 ost->st_dev = st->st_dev; 2270 if (ost->st_dev != st->st_dev) { 2271 switch (ino64_trunc_error) { 2272 default: 2273 /* 2274 * Since dev_t is almost raw, don't clamp to the 2275 * maximum for case 2, but ignore the error. 2276 */ 2277 break; 2278 case 1: 2279 return (EOVERFLOW); 2280 } 2281 } 2282 ost->st_ino = st->st_ino; 2283 if (ost->st_ino != st->st_ino) { 2284 switch (ino64_trunc_error) { 2285 default: 2286 case 0: 2287 break; 2288 case 1: 2289 return (EOVERFLOW); 2290 case 2: 2291 ost->st_ino = UINT32_MAX; 2292 break; 2293 } 2294 } 2295 ost->st_mode = st->st_mode; 2296 ost->st_nlink = st->st_nlink; 2297 if (ost->st_nlink != st->st_nlink) { 2298 switch (ino64_trunc_error) { 2299 default: 2300 case 0: 2301 break; 2302 case 1: 2303 return (EOVERFLOW); 2304 case 2: 2305 ost->st_nlink = UINT16_MAX; 2306 break; 2307 } 2308 } 2309 ost->st_uid = st->st_uid; 2310 ost->st_gid = st->st_gid; 2311 ost->st_rdev = st->st_rdev; 2312 if (ost->st_rdev != st->st_rdev) { 2313 switch (ino64_trunc_error) { 2314 default: 2315 break; 2316 case 1: 2317 return (EOVERFLOW); 2318 } 2319 } 2320 ost->st_atim = st->st_atim; 2321 ost->st_mtim = st->st_mtim; 2322 ost->st_ctim = st->st_ctim; 2323 ost->st_size = st->st_size; 2324 ost->st_blocks = st->st_blocks; 2325 ost->st_blksize = st->st_blksize; 2326 ost->st_flags = st->st_flags; 2327 ost->st_gen = st->st_gen; 2328 ost->st_lspare = 0; 2329 ost->st_birthtim = st->st_birthtim; 2330 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2331 sizeof(*ost) - offsetof(struct freebsd11_stat, 2332 st_birthtim) - sizeof(ost->st_birthtim)); 2333 return (0); 2334 } 2335 2336 int 2337 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2338 { 2339 struct stat sb; 2340 struct freebsd11_stat osb; 2341 int error; 2342 2343 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2344 &sb, NULL); 2345 if (error != 0) 2346 return (error); 2347 error = freebsd11_cvtstat(&sb, &osb); 2348 if (error == 0) 2349 error = copyout(&osb, uap->ub, sizeof(osb)); 2350 return (error); 2351 } 2352 2353 int 2354 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2355 { 2356 struct stat sb; 2357 struct freebsd11_stat osb; 2358 int error; 2359 2360 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2361 UIO_USERSPACE, &sb, NULL); 2362 if (error != 0) 2363 return (error); 2364 error = freebsd11_cvtstat(&sb, &osb); 2365 if (error == 0) 2366 error = copyout(&osb, uap->ub, sizeof(osb)); 2367 return (error); 2368 } 2369 2370 int 2371 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2372 { 2373 struct fhandle fh; 2374 struct stat sb; 2375 struct freebsd11_stat osb; 2376 int error; 2377 2378 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2379 if (error != 0) 2380 return (error); 2381 error = kern_fhstat(td, fh, &sb); 2382 if (error != 0) 2383 return (error); 2384 error = freebsd11_cvtstat(&sb, &osb); 2385 if (error == 0) 2386 error = copyout(&osb, uap->sb, sizeof(osb)); 2387 return (error); 2388 } 2389 2390 int 2391 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2392 { 2393 struct stat sb; 2394 struct freebsd11_stat osb; 2395 int error; 2396 2397 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2398 UIO_USERSPACE, &sb, NULL); 2399 if (error != 0) 2400 return (error); 2401 error = freebsd11_cvtstat(&sb, &osb); 2402 if (error == 0) 2403 error = copyout(&osb, uap->buf, sizeof(osb)); 2404 return (error); 2405 } 2406 #endif /* COMPAT_FREEBSD11 */ 2407 2408 /* 2409 * Get file status 2410 */ 2411 #ifndef _SYS_SYSPROTO_H_ 2412 struct fstatat_args { 2413 int fd; 2414 char *path; 2415 struct stat *buf; 2416 int flag; 2417 } 2418 #endif 2419 int 2420 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2421 { 2422 struct stat sb; 2423 int error; 2424 2425 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2426 UIO_USERSPACE, &sb, NULL); 2427 if (error == 0) 2428 error = copyout(&sb, uap->buf, sizeof (sb)); 2429 return (error); 2430 } 2431 2432 int 2433 kern_statat(struct thread *td, int flag, int fd, const char *path, 2434 enum uio_seg pathseg, struct stat *sbp, 2435 void (*hook)(struct vnode *vp, struct stat *sbp)) 2436 { 2437 struct nameidata nd; 2438 int error; 2439 2440 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2441 AT_EMPTY_PATH)) != 0) 2442 return (EINVAL); 2443 2444 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH | 2445 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF | 2446 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, td); 2447 2448 if ((error = namei(&nd)) != 0) { 2449 if (error == ENOTDIR && 2450 (nd.ni_resflags & NIRES_EMPTYPATH) != 0) 2451 error = kern_fstat(td, fd, sbp); 2452 return (error); 2453 } 2454 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED); 2455 if (error == 0) { 2456 if (__predict_false(hook != NULL)) 2457 hook(nd.ni_vp, sbp); 2458 } 2459 NDFREE_NOTHING(&nd); 2460 vput(nd.ni_vp); 2461 #ifdef __STAT_TIME_T_EXT 2462 sbp->st_atim_ext = 0; 2463 sbp->st_mtim_ext = 0; 2464 sbp->st_ctim_ext = 0; 2465 sbp->st_btim_ext = 0; 2466 #endif 2467 #ifdef KTRACE 2468 if (KTRPOINT(td, KTR_STRUCT)) 2469 ktrstat_error(sbp, error); 2470 #endif 2471 return (error); 2472 } 2473 2474 #if defined(COMPAT_FREEBSD11) 2475 /* 2476 * Implementation of the NetBSD [l]stat() functions. 2477 */ 2478 void 2479 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2480 { 2481 2482 bzero(nsb, sizeof(*nsb)); 2483 nsb->st_dev = sb->st_dev; 2484 nsb->st_ino = sb->st_ino; 2485 nsb->st_mode = sb->st_mode; 2486 nsb->st_nlink = sb->st_nlink; 2487 nsb->st_uid = sb->st_uid; 2488 nsb->st_gid = sb->st_gid; 2489 nsb->st_rdev = sb->st_rdev; 2490 nsb->st_atim = sb->st_atim; 2491 nsb->st_mtim = sb->st_mtim; 2492 nsb->st_ctim = sb->st_ctim; 2493 nsb->st_size = sb->st_size; 2494 nsb->st_blocks = sb->st_blocks; 2495 nsb->st_blksize = sb->st_blksize; 2496 nsb->st_flags = sb->st_flags; 2497 nsb->st_gen = sb->st_gen; 2498 nsb->st_birthtim = sb->st_birthtim; 2499 } 2500 2501 #ifndef _SYS_SYSPROTO_H_ 2502 struct freebsd11_nstat_args { 2503 char *path; 2504 struct nstat *ub; 2505 }; 2506 #endif 2507 int 2508 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2509 { 2510 struct stat sb; 2511 struct nstat nsb; 2512 int error; 2513 2514 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2515 &sb, NULL); 2516 if (error != 0) 2517 return (error); 2518 freebsd11_cvtnstat(&sb, &nsb); 2519 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2520 } 2521 2522 /* 2523 * NetBSD lstat. Get file status; this version does not follow links. 2524 */ 2525 #ifndef _SYS_SYSPROTO_H_ 2526 struct freebsd11_nlstat_args { 2527 char *path; 2528 struct nstat *ub; 2529 }; 2530 #endif 2531 int 2532 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2533 { 2534 struct stat sb; 2535 struct nstat nsb; 2536 int error; 2537 2538 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2539 UIO_USERSPACE, &sb, NULL); 2540 if (error != 0) 2541 return (error); 2542 freebsd11_cvtnstat(&sb, &nsb); 2543 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2544 } 2545 #endif /* COMPAT_FREEBSD11 */ 2546 2547 /* 2548 * Get configurable pathname variables. 2549 */ 2550 #ifndef _SYS_SYSPROTO_H_ 2551 struct pathconf_args { 2552 char *path; 2553 int name; 2554 }; 2555 #endif 2556 int 2557 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2558 { 2559 long value; 2560 int error; 2561 2562 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2563 &value); 2564 if (error == 0) 2565 td->td_retval[0] = value; 2566 return (error); 2567 } 2568 2569 #ifndef _SYS_SYSPROTO_H_ 2570 struct lpathconf_args { 2571 char *path; 2572 int name; 2573 }; 2574 #endif 2575 int 2576 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2577 { 2578 long value; 2579 int error; 2580 2581 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2582 NOFOLLOW, &value); 2583 if (error == 0) 2584 td->td_retval[0] = value; 2585 return (error); 2586 } 2587 2588 int 2589 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2590 int name, u_long flags, long *valuep) 2591 { 2592 struct nameidata nd; 2593 int error; 2594 2595 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2596 pathseg, path, td); 2597 if ((error = namei(&nd)) != 0) 2598 return (error); 2599 NDFREE_NOTHING(&nd); 2600 2601 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2602 vput(nd.ni_vp); 2603 return (error); 2604 } 2605 2606 /* 2607 * Return target name of a symbolic link. 2608 */ 2609 #ifndef _SYS_SYSPROTO_H_ 2610 struct readlink_args { 2611 char *path; 2612 char *buf; 2613 size_t count; 2614 }; 2615 #endif 2616 int 2617 sys_readlink(struct thread *td, struct readlink_args *uap) 2618 { 2619 2620 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2621 uap->buf, UIO_USERSPACE, uap->count)); 2622 } 2623 #ifndef _SYS_SYSPROTO_H_ 2624 struct readlinkat_args { 2625 int fd; 2626 char *path; 2627 char *buf; 2628 size_t bufsize; 2629 }; 2630 #endif 2631 int 2632 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2633 { 2634 2635 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2636 uap->buf, UIO_USERSPACE, uap->bufsize)); 2637 } 2638 2639 int 2640 kern_readlinkat(struct thread *td, int fd, const char *path, 2641 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2642 { 2643 struct vnode *vp; 2644 struct nameidata nd; 2645 int error; 2646 2647 if (count > IOSIZE_MAX) 2648 return (EINVAL); 2649 2650 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | 2651 EMPTYPATH, pathseg, path, fd, td); 2652 2653 if ((error = namei(&nd)) != 0) 2654 return (error); 2655 NDFREE_NOTHING(&nd); 2656 vp = nd.ni_vp; 2657 2658 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2659 vput(vp); 2660 2661 return (error); 2662 } 2663 2664 /* 2665 * Helper function to readlink from a vnode 2666 */ 2667 static int 2668 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2669 struct thread *td) 2670 { 2671 struct iovec aiov; 2672 struct uio auio; 2673 int error; 2674 2675 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2676 #ifdef MAC 2677 error = mac_vnode_check_readlink(td->td_ucred, vp); 2678 if (error != 0) 2679 return (error); 2680 #endif 2681 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2682 return (EINVAL); 2683 2684 aiov.iov_base = buf; 2685 aiov.iov_len = count; 2686 auio.uio_iov = &aiov; 2687 auio.uio_iovcnt = 1; 2688 auio.uio_offset = 0; 2689 auio.uio_rw = UIO_READ; 2690 auio.uio_segflg = bufseg; 2691 auio.uio_td = td; 2692 auio.uio_resid = count; 2693 error = VOP_READLINK(vp, &auio, td->td_ucred); 2694 td->td_retval[0] = count - auio.uio_resid; 2695 return (error); 2696 } 2697 2698 /* 2699 * Common implementation code for chflags() and fchflags(). 2700 */ 2701 static int 2702 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2703 { 2704 struct mount *mp; 2705 struct vattr vattr; 2706 int error; 2707 2708 /* We can't support the value matching VNOVAL. */ 2709 if (flags == VNOVAL) 2710 return (EOPNOTSUPP); 2711 2712 /* 2713 * Prevent non-root users from setting flags on devices. When 2714 * a device is reused, users can retain ownership of the device 2715 * if they are allowed to set flags and programs assume that 2716 * chown can't fail when done as root. 2717 */ 2718 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2719 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2720 if (error != 0) 2721 return (error); 2722 } 2723 2724 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2725 return (error); 2726 VATTR_NULL(&vattr); 2727 vattr.va_flags = flags; 2728 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2729 #ifdef MAC 2730 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2731 if (error == 0) 2732 #endif 2733 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2734 VOP_UNLOCK(vp); 2735 vn_finished_write(mp); 2736 return (error); 2737 } 2738 2739 /* 2740 * Change flags of a file given a path name. 2741 */ 2742 #ifndef _SYS_SYSPROTO_H_ 2743 struct chflags_args { 2744 const char *path; 2745 u_long flags; 2746 }; 2747 #endif 2748 int 2749 sys_chflags(struct thread *td, struct chflags_args *uap) 2750 { 2751 2752 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2753 uap->flags, 0)); 2754 } 2755 2756 #ifndef _SYS_SYSPROTO_H_ 2757 struct chflagsat_args { 2758 int fd; 2759 const char *path; 2760 u_long flags; 2761 int atflag; 2762 } 2763 #endif 2764 int 2765 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2766 { 2767 2768 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2769 uap->flags, uap->atflag)); 2770 } 2771 2772 /* 2773 * Same as chflags() but doesn't follow symlinks. 2774 */ 2775 #ifndef _SYS_SYSPROTO_H_ 2776 struct lchflags_args { 2777 const char *path; 2778 u_long flags; 2779 }; 2780 #endif 2781 int 2782 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2783 { 2784 2785 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2786 uap->flags, AT_SYMLINK_NOFOLLOW)); 2787 } 2788 2789 static int 2790 kern_chflagsat(struct thread *td, int fd, const char *path, 2791 enum uio_seg pathseg, u_long flags, int atflag) 2792 { 2793 struct nameidata nd; 2794 int error; 2795 2796 if ((atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2797 AT_EMPTY_PATH)) != 0) 2798 return (EINVAL); 2799 2800 AUDIT_ARG_FFLAGS(flags); 2801 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW | 2802 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2803 fd, &cap_fchflags_rights, td); 2804 if ((error = namei(&nd)) != 0) 2805 return (error); 2806 NDFREE_NOTHING(&nd); 2807 error = setfflags(td, nd.ni_vp, flags); 2808 vrele(nd.ni_vp); 2809 return (error); 2810 } 2811 2812 /* 2813 * Change flags of a file given a file descriptor. 2814 */ 2815 #ifndef _SYS_SYSPROTO_H_ 2816 struct fchflags_args { 2817 int fd; 2818 u_long flags; 2819 }; 2820 #endif 2821 int 2822 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2823 { 2824 struct file *fp; 2825 int error; 2826 2827 AUDIT_ARG_FD(uap->fd); 2828 AUDIT_ARG_FFLAGS(uap->flags); 2829 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2830 &fp); 2831 if (error != 0) 2832 return (error); 2833 #ifdef AUDIT 2834 if (AUDITING_TD(td)) { 2835 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2836 AUDIT_ARG_VNODE1(fp->f_vnode); 2837 VOP_UNLOCK(fp->f_vnode); 2838 } 2839 #endif 2840 error = setfflags(td, fp->f_vnode, uap->flags); 2841 fdrop(fp, td); 2842 return (error); 2843 } 2844 2845 /* 2846 * Common implementation code for chmod(), lchmod() and fchmod(). 2847 */ 2848 int 2849 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2850 { 2851 struct mount *mp; 2852 struct vattr vattr; 2853 int error; 2854 2855 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2856 return (error); 2857 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2858 VATTR_NULL(&vattr); 2859 vattr.va_mode = mode & ALLPERMS; 2860 #ifdef MAC 2861 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2862 if (error == 0) 2863 #endif 2864 error = VOP_SETATTR(vp, &vattr, cred); 2865 VOP_UNLOCK(vp); 2866 vn_finished_write(mp); 2867 return (error); 2868 } 2869 2870 /* 2871 * Change mode of a file given path name. 2872 */ 2873 #ifndef _SYS_SYSPROTO_H_ 2874 struct chmod_args { 2875 char *path; 2876 int mode; 2877 }; 2878 #endif 2879 int 2880 sys_chmod(struct thread *td, struct chmod_args *uap) 2881 { 2882 2883 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2884 uap->mode, 0)); 2885 } 2886 2887 #ifndef _SYS_SYSPROTO_H_ 2888 struct fchmodat_args { 2889 int dirfd; 2890 char *path; 2891 mode_t mode; 2892 int flag; 2893 } 2894 #endif 2895 int 2896 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2897 { 2898 2899 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2900 uap->mode, uap->flag)); 2901 } 2902 2903 /* 2904 * Change mode of a file given path name (don't follow links.) 2905 */ 2906 #ifndef _SYS_SYSPROTO_H_ 2907 struct lchmod_args { 2908 char *path; 2909 int mode; 2910 }; 2911 #endif 2912 int 2913 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2914 { 2915 2916 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2917 uap->mode, AT_SYMLINK_NOFOLLOW)); 2918 } 2919 2920 int 2921 kern_fchmodat(struct thread *td, int fd, const char *path, 2922 enum uio_seg pathseg, mode_t mode, int flag) 2923 { 2924 struct nameidata nd; 2925 int error; 2926 2927 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2928 AT_EMPTY_PATH)) != 0) 2929 return (EINVAL); 2930 2931 AUDIT_ARG_MODE(mode); 2932 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 2933 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2934 fd, &cap_fchmod_rights, td); 2935 if ((error = namei(&nd)) != 0) 2936 return (error); 2937 NDFREE_NOTHING(&nd); 2938 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2939 vrele(nd.ni_vp); 2940 return (error); 2941 } 2942 2943 /* 2944 * Change mode of a file given a file descriptor. 2945 */ 2946 #ifndef _SYS_SYSPROTO_H_ 2947 struct fchmod_args { 2948 int fd; 2949 int mode; 2950 }; 2951 #endif 2952 int 2953 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2954 { 2955 struct file *fp; 2956 int error; 2957 2958 AUDIT_ARG_FD(uap->fd); 2959 AUDIT_ARG_MODE(uap->mode); 2960 2961 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2962 if (error != 0) 2963 return (error); 2964 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2965 fdrop(fp, td); 2966 return (error); 2967 } 2968 2969 /* 2970 * Common implementation for chown(), lchown(), and fchown() 2971 */ 2972 int 2973 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2974 gid_t gid) 2975 { 2976 struct mount *mp; 2977 struct vattr vattr; 2978 int error; 2979 2980 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2981 return (error); 2982 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2983 VATTR_NULL(&vattr); 2984 vattr.va_uid = uid; 2985 vattr.va_gid = gid; 2986 #ifdef MAC 2987 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2988 vattr.va_gid); 2989 if (error == 0) 2990 #endif 2991 error = VOP_SETATTR(vp, &vattr, cred); 2992 VOP_UNLOCK(vp); 2993 vn_finished_write(mp); 2994 return (error); 2995 } 2996 2997 /* 2998 * Set ownership given a path name. 2999 */ 3000 #ifndef _SYS_SYSPROTO_H_ 3001 struct chown_args { 3002 char *path; 3003 int uid; 3004 int gid; 3005 }; 3006 #endif 3007 int 3008 sys_chown(struct thread *td, struct chown_args *uap) 3009 { 3010 3011 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 3012 uap->gid, 0)); 3013 } 3014 3015 #ifndef _SYS_SYSPROTO_H_ 3016 struct fchownat_args { 3017 int fd; 3018 const char * path; 3019 uid_t uid; 3020 gid_t gid; 3021 int flag; 3022 }; 3023 #endif 3024 int 3025 sys_fchownat(struct thread *td, struct fchownat_args *uap) 3026 { 3027 3028 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 3029 uap->gid, uap->flag)); 3030 } 3031 3032 int 3033 kern_fchownat(struct thread *td, int fd, const char *path, 3034 enum uio_seg pathseg, int uid, int gid, int flag) 3035 { 3036 struct nameidata nd; 3037 int error; 3038 3039 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3040 AT_EMPTY_PATH)) != 0) 3041 return (EINVAL); 3042 3043 AUDIT_ARG_OWNER(uid, gid); 3044 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3045 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3046 fd, &cap_fchown_rights, td); 3047 3048 if ((error = namei(&nd)) != 0) 3049 return (error); 3050 NDFREE_NOTHING(&nd); 3051 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 3052 vrele(nd.ni_vp); 3053 return (error); 3054 } 3055 3056 /* 3057 * Set ownership given a path name, do not cross symlinks. 3058 */ 3059 #ifndef _SYS_SYSPROTO_H_ 3060 struct lchown_args { 3061 char *path; 3062 int uid; 3063 int gid; 3064 }; 3065 #endif 3066 int 3067 sys_lchown(struct thread *td, struct lchown_args *uap) 3068 { 3069 3070 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3071 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 3072 } 3073 3074 /* 3075 * Set ownership given a file descriptor. 3076 */ 3077 #ifndef _SYS_SYSPROTO_H_ 3078 struct fchown_args { 3079 int fd; 3080 int uid; 3081 int gid; 3082 }; 3083 #endif 3084 int 3085 sys_fchown(struct thread *td, struct fchown_args *uap) 3086 { 3087 struct file *fp; 3088 int error; 3089 3090 AUDIT_ARG_FD(uap->fd); 3091 AUDIT_ARG_OWNER(uap->uid, uap->gid); 3092 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 3093 if (error != 0) 3094 return (error); 3095 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 3096 fdrop(fp, td); 3097 return (error); 3098 } 3099 3100 /* 3101 * Common implementation code for utimes(), lutimes(), and futimes(). 3102 */ 3103 static int 3104 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 3105 struct timespec *tsp) 3106 { 3107 struct timeval tv[2]; 3108 const struct timeval *tvp; 3109 int error; 3110 3111 if (usrtvp == NULL) { 3112 vfs_timestamp(&tsp[0]); 3113 tsp[1] = tsp[0]; 3114 } else { 3115 if (tvpseg == UIO_SYSSPACE) { 3116 tvp = usrtvp; 3117 } else { 3118 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3119 return (error); 3120 tvp = tv; 3121 } 3122 3123 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3124 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3125 return (EINVAL); 3126 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3127 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3128 } 3129 return (0); 3130 } 3131 3132 /* 3133 * Common implementation code for futimens(), utimensat(). 3134 */ 3135 #define UTIMENS_NULL 0x1 3136 #define UTIMENS_EXIT 0x2 3137 static int 3138 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3139 struct timespec *tsp, int *retflags) 3140 { 3141 struct timespec tsnow; 3142 int error; 3143 3144 vfs_timestamp(&tsnow); 3145 *retflags = 0; 3146 if (usrtsp == NULL) { 3147 tsp[0] = tsnow; 3148 tsp[1] = tsnow; 3149 *retflags |= UTIMENS_NULL; 3150 return (0); 3151 } 3152 if (tspseg == UIO_SYSSPACE) { 3153 tsp[0] = usrtsp[0]; 3154 tsp[1] = usrtsp[1]; 3155 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3156 return (error); 3157 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3158 *retflags |= UTIMENS_EXIT; 3159 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3160 *retflags |= UTIMENS_NULL; 3161 if (tsp[0].tv_nsec == UTIME_OMIT) 3162 tsp[0].tv_sec = VNOVAL; 3163 else if (tsp[0].tv_nsec == UTIME_NOW) 3164 tsp[0] = tsnow; 3165 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3166 return (EINVAL); 3167 if (tsp[1].tv_nsec == UTIME_OMIT) 3168 tsp[1].tv_sec = VNOVAL; 3169 else if (tsp[1].tv_nsec == UTIME_NOW) 3170 tsp[1] = tsnow; 3171 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3172 return (EINVAL); 3173 3174 return (0); 3175 } 3176 3177 /* 3178 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3179 * and utimensat(). 3180 */ 3181 static int 3182 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3183 int numtimes, int nullflag) 3184 { 3185 struct mount *mp; 3186 struct vattr vattr; 3187 int error; 3188 bool setbirthtime; 3189 3190 setbirthtime = false; 3191 vattr.va_birthtime.tv_sec = VNOVAL; 3192 vattr.va_birthtime.tv_nsec = 0; 3193 3194 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3195 return (error); 3196 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3197 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred) == 0 && 3198 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3199 setbirthtime = true; 3200 VATTR_NULL(&vattr); 3201 vattr.va_atime = ts[0]; 3202 vattr.va_mtime = ts[1]; 3203 if (setbirthtime) 3204 vattr.va_birthtime = ts[1]; 3205 if (numtimes > 2) 3206 vattr.va_birthtime = ts[2]; 3207 if (nullflag) 3208 vattr.va_vaflags |= VA_UTIMES_NULL; 3209 #ifdef MAC 3210 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3211 vattr.va_mtime); 3212 #endif 3213 if (error == 0) 3214 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3215 VOP_UNLOCK(vp); 3216 vn_finished_write(mp); 3217 return (error); 3218 } 3219 3220 /* 3221 * Set the access and modification times of a file. 3222 */ 3223 #ifndef _SYS_SYSPROTO_H_ 3224 struct utimes_args { 3225 char *path; 3226 struct timeval *tptr; 3227 }; 3228 #endif 3229 int 3230 sys_utimes(struct thread *td, struct utimes_args *uap) 3231 { 3232 3233 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3234 uap->tptr, UIO_USERSPACE)); 3235 } 3236 3237 #ifndef _SYS_SYSPROTO_H_ 3238 struct futimesat_args { 3239 int fd; 3240 const char * path; 3241 const struct timeval * times; 3242 }; 3243 #endif 3244 int 3245 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3246 { 3247 3248 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3249 uap->times, UIO_USERSPACE)); 3250 } 3251 3252 int 3253 kern_utimesat(struct thread *td, int fd, const char *path, 3254 enum uio_seg pathseg, const struct timeval *tptr, enum uio_seg tptrseg) 3255 { 3256 struct nameidata nd; 3257 struct timespec ts[2]; 3258 int error; 3259 3260 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3261 return (error); 3262 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3263 &cap_futimes_rights, td); 3264 3265 if ((error = namei(&nd)) != 0) 3266 return (error); 3267 NDFREE_NOTHING(&nd); 3268 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3269 vrele(nd.ni_vp); 3270 return (error); 3271 } 3272 3273 /* 3274 * Set the access and modification times of a file. 3275 */ 3276 #ifndef _SYS_SYSPROTO_H_ 3277 struct lutimes_args { 3278 char *path; 3279 struct timeval *tptr; 3280 }; 3281 #endif 3282 int 3283 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3284 { 3285 3286 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3287 UIO_USERSPACE)); 3288 } 3289 3290 int 3291 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3292 const struct timeval *tptr, enum uio_seg tptrseg) 3293 { 3294 struct timespec ts[2]; 3295 struct nameidata nd; 3296 int error; 3297 3298 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3299 return (error); 3300 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3301 if ((error = namei(&nd)) != 0) 3302 return (error); 3303 NDFREE_NOTHING(&nd); 3304 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3305 vrele(nd.ni_vp); 3306 return (error); 3307 } 3308 3309 /* 3310 * Set the access and modification times of a file. 3311 */ 3312 #ifndef _SYS_SYSPROTO_H_ 3313 struct futimes_args { 3314 int fd; 3315 struct timeval *tptr; 3316 }; 3317 #endif 3318 int 3319 sys_futimes(struct thread *td, struct futimes_args *uap) 3320 { 3321 3322 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3323 } 3324 3325 int 3326 kern_futimes(struct thread *td, int fd, const struct timeval *tptr, 3327 enum uio_seg tptrseg) 3328 { 3329 struct timespec ts[2]; 3330 struct file *fp; 3331 int error; 3332 3333 AUDIT_ARG_FD(fd); 3334 error = getutimes(tptr, tptrseg, ts); 3335 if (error != 0) 3336 return (error); 3337 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3338 if (error != 0) 3339 return (error); 3340 #ifdef AUDIT 3341 if (AUDITING_TD(td)) { 3342 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3343 AUDIT_ARG_VNODE1(fp->f_vnode); 3344 VOP_UNLOCK(fp->f_vnode); 3345 } 3346 #endif 3347 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3348 fdrop(fp, td); 3349 return (error); 3350 } 3351 3352 int 3353 sys_futimens(struct thread *td, struct futimens_args *uap) 3354 { 3355 3356 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3357 } 3358 3359 int 3360 kern_futimens(struct thread *td, int fd, const struct timespec *tptr, 3361 enum uio_seg tptrseg) 3362 { 3363 struct timespec ts[2]; 3364 struct file *fp; 3365 int error, flags; 3366 3367 AUDIT_ARG_FD(fd); 3368 error = getutimens(tptr, tptrseg, ts, &flags); 3369 if (error != 0) 3370 return (error); 3371 if (flags & UTIMENS_EXIT) 3372 return (0); 3373 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3374 if (error != 0) 3375 return (error); 3376 #ifdef AUDIT 3377 if (AUDITING_TD(td)) { 3378 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3379 AUDIT_ARG_VNODE1(fp->f_vnode); 3380 VOP_UNLOCK(fp->f_vnode); 3381 } 3382 #endif 3383 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3384 fdrop(fp, td); 3385 return (error); 3386 } 3387 3388 int 3389 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3390 { 3391 3392 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3393 uap->times, UIO_USERSPACE, uap->flag)); 3394 } 3395 3396 int 3397 kern_utimensat(struct thread *td, int fd, const char *path, 3398 enum uio_seg pathseg, const struct timespec *tptr, enum uio_seg tptrseg, 3399 int flag) 3400 { 3401 struct nameidata nd; 3402 struct timespec ts[2]; 3403 int error, flags; 3404 3405 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3406 AT_EMPTY_PATH)) != 0) 3407 return (EINVAL); 3408 3409 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3410 return (error); 3411 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3412 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, 3413 pathseg, path, fd, &cap_futimes_rights, td); 3414 if ((error = namei(&nd)) != 0) 3415 return (error); 3416 /* 3417 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3418 * POSIX states: 3419 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3420 * "Search permission is denied by a component of the path prefix." 3421 */ 3422 NDFREE_NOTHING(&nd); 3423 if ((flags & UTIMENS_EXIT) == 0) 3424 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3425 vrele(nd.ni_vp); 3426 return (error); 3427 } 3428 3429 /* 3430 * Truncate a file given its path name. 3431 */ 3432 #ifndef _SYS_SYSPROTO_H_ 3433 struct truncate_args { 3434 char *path; 3435 int pad; 3436 off_t length; 3437 }; 3438 #endif 3439 int 3440 sys_truncate(struct thread *td, struct truncate_args *uap) 3441 { 3442 3443 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3444 } 3445 3446 int 3447 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3448 off_t length) 3449 { 3450 struct mount *mp; 3451 struct vnode *vp; 3452 void *rl_cookie; 3453 struct vattr vattr; 3454 struct nameidata nd; 3455 int error; 3456 3457 if (length < 0) 3458 return (EINVAL); 3459 NDPREINIT(&nd); 3460 retry: 3461 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3462 if ((error = namei(&nd)) != 0) 3463 return (error); 3464 vp = nd.ni_vp; 3465 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3466 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3467 vn_rangelock_unlock(vp, rl_cookie); 3468 vrele(vp); 3469 return (error); 3470 } 3471 NDFREE(&nd, NDF_ONLY_PNBUF); 3472 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3473 if (vp->v_type == VDIR) 3474 error = EISDIR; 3475 #ifdef MAC 3476 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3477 } 3478 #endif 3479 else if ((error = vn_writechk(vp)) == 0 && 3480 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3481 VATTR_NULL(&vattr); 3482 vattr.va_size = length; 3483 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3484 } 3485 VOP_UNLOCK(vp); 3486 vn_finished_write(mp); 3487 vn_rangelock_unlock(vp, rl_cookie); 3488 vrele(vp); 3489 if (error == ERELOOKUP) 3490 goto retry; 3491 return (error); 3492 } 3493 3494 #if defined(COMPAT_43) 3495 /* 3496 * Truncate a file given its path name. 3497 */ 3498 #ifndef _SYS_SYSPROTO_H_ 3499 struct otruncate_args { 3500 char *path; 3501 long length; 3502 }; 3503 #endif 3504 int 3505 otruncate(struct thread *td, struct otruncate_args *uap) 3506 { 3507 3508 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3509 } 3510 #endif /* COMPAT_43 */ 3511 3512 #if defined(COMPAT_FREEBSD6) 3513 /* Versions with the pad argument */ 3514 int 3515 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3516 { 3517 3518 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3519 } 3520 3521 int 3522 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3523 { 3524 3525 return (kern_ftruncate(td, uap->fd, uap->length)); 3526 } 3527 #endif 3528 3529 int 3530 kern_fsync(struct thread *td, int fd, bool fullsync) 3531 { 3532 struct vnode *vp; 3533 struct mount *mp; 3534 struct file *fp; 3535 int error; 3536 3537 AUDIT_ARG_FD(fd); 3538 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3539 if (error != 0) 3540 return (error); 3541 vp = fp->f_vnode; 3542 #if 0 3543 if (!fullsync) 3544 /* XXXKIB: compete outstanding aio writes */; 3545 #endif 3546 retry: 3547 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3548 if (error != 0) 3549 goto drop; 3550 vn_lock(vp, vn_lktype_write(mp, vp) | LK_RETRY); 3551 AUDIT_ARG_VNODE1(vp); 3552 if (vp->v_object != NULL) { 3553 VM_OBJECT_WLOCK(vp->v_object); 3554 vm_object_page_clean(vp->v_object, 0, 0, 0); 3555 VM_OBJECT_WUNLOCK(vp->v_object); 3556 } 3557 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3558 VOP_UNLOCK(vp); 3559 vn_finished_write(mp); 3560 if (error == ERELOOKUP) 3561 goto retry; 3562 drop: 3563 fdrop(fp, td); 3564 return (error); 3565 } 3566 3567 /* 3568 * Sync an open file. 3569 */ 3570 #ifndef _SYS_SYSPROTO_H_ 3571 struct fsync_args { 3572 int fd; 3573 }; 3574 #endif 3575 int 3576 sys_fsync(struct thread *td, struct fsync_args *uap) 3577 { 3578 3579 return (kern_fsync(td, uap->fd, true)); 3580 } 3581 3582 int 3583 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3584 { 3585 3586 return (kern_fsync(td, uap->fd, false)); 3587 } 3588 3589 /* 3590 * Rename files. Source and destination must either both be directories, or 3591 * both not be directories. If target is a directory, it must be empty. 3592 */ 3593 #ifndef _SYS_SYSPROTO_H_ 3594 struct rename_args { 3595 char *from; 3596 char *to; 3597 }; 3598 #endif 3599 int 3600 sys_rename(struct thread *td, struct rename_args *uap) 3601 { 3602 3603 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3604 uap->to, UIO_USERSPACE)); 3605 } 3606 3607 #ifndef _SYS_SYSPROTO_H_ 3608 struct renameat_args { 3609 int oldfd; 3610 char *old; 3611 int newfd; 3612 char *new; 3613 }; 3614 #endif 3615 int 3616 sys_renameat(struct thread *td, struct renameat_args *uap) 3617 { 3618 3619 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3620 UIO_USERSPACE)); 3621 } 3622 3623 #ifdef MAC 3624 static int 3625 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd, 3626 const char *new, enum uio_seg pathseg, struct nameidata *fromnd) 3627 { 3628 int error; 3629 3630 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3631 AUDITVNODE1, pathseg, old, oldfd, &cap_renameat_source_rights, td); 3632 if ((error = namei(fromnd)) != 0) 3633 return (error); 3634 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp, 3635 fromnd->ni_vp, &fromnd->ni_cnd); 3636 VOP_UNLOCK(fromnd->ni_dvp); 3637 if (fromnd->ni_dvp != fromnd->ni_vp) 3638 VOP_UNLOCK(fromnd->ni_vp); 3639 if (error != 0) { 3640 NDFREE(fromnd, NDF_ONLY_PNBUF); 3641 vrele(fromnd->ni_dvp); 3642 vrele(fromnd->ni_vp); 3643 if (fromnd->ni_startdir) 3644 vrele(fromnd->ni_startdir); 3645 } 3646 return (error); 3647 } 3648 #endif 3649 3650 int 3651 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3652 const char *new, enum uio_seg pathseg) 3653 { 3654 struct mount *mp = NULL; 3655 struct vnode *tvp, *fvp, *tdvp; 3656 struct nameidata fromnd, tond; 3657 u_int64_t tondflags; 3658 int error; 3659 3660 again: 3661 bwillwrite(); 3662 #ifdef MAC 3663 if (mac_vnode_check_rename_from_enabled()) { 3664 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg, 3665 &fromnd); 3666 if (error != 0) 3667 return (error); 3668 } else { 3669 #endif 3670 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3671 pathseg, old, oldfd, &cap_renameat_source_rights, td); 3672 if ((error = namei(&fromnd)) != 0) 3673 return (error); 3674 #ifdef MAC 3675 } 3676 #endif 3677 fvp = fromnd.ni_vp; 3678 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | AUDITVNODE2; 3679 if (fromnd.ni_vp->v_type == VDIR) 3680 tondflags |= WILLBEDIR; 3681 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd, 3682 &cap_renameat_target_rights, td); 3683 if ((error = namei(&tond)) != 0) { 3684 /* Translate error code for rename("dir1", "dir2/."). */ 3685 if (error == EISDIR && fvp->v_type == VDIR) 3686 error = EINVAL; 3687 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3688 vrele(fromnd.ni_dvp); 3689 vrele(fvp); 3690 goto out1; 3691 } 3692 tdvp = tond.ni_dvp; 3693 tvp = tond.ni_vp; 3694 error = vn_start_write(fvp, &mp, V_NOWAIT); 3695 if (error != 0) { 3696 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3697 NDFREE(&tond, NDF_ONLY_PNBUF); 3698 if (tvp != NULL) 3699 vput(tvp); 3700 if (tdvp == tvp) 3701 vrele(tdvp); 3702 else 3703 vput(tdvp); 3704 vrele(fromnd.ni_dvp); 3705 vrele(fvp); 3706 vrele(tond.ni_startdir); 3707 if (fromnd.ni_startdir != NULL) 3708 vrele(fromnd.ni_startdir); 3709 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3710 if (error != 0) 3711 return (error); 3712 goto again; 3713 } 3714 if (tvp != NULL) { 3715 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3716 error = ENOTDIR; 3717 goto out; 3718 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3719 error = EISDIR; 3720 goto out; 3721 } 3722 #ifdef CAPABILITIES 3723 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3724 /* 3725 * If the target already exists we require CAP_UNLINKAT 3726 * from 'newfd', when newfd was used for the lookup. 3727 */ 3728 error = cap_check(&tond.ni_filecaps.fc_rights, 3729 &cap_unlinkat_rights); 3730 if (error != 0) 3731 goto out; 3732 } 3733 #endif 3734 } 3735 if (fvp == tdvp) { 3736 error = EINVAL; 3737 goto out; 3738 } 3739 /* 3740 * If the source is the same as the destination (that is, if they 3741 * are links to the same vnode), then there is nothing to do. 3742 */ 3743 if (fvp == tvp) 3744 error = ERESTART; 3745 #ifdef MAC 3746 else 3747 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3748 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3749 #endif 3750 out: 3751 if (error == 0) { 3752 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3753 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3754 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3755 NDFREE(&tond, NDF_ONLY_PNBUF); 3756 } else { 3757 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3758 NDFREE(&tond, NDF_ONLY_PNBUF); 3759 if (tvp != NULL) 3760 vput(tvp); 3761 if (tdvp == tvp) 3762 vrele(tdvp); 3763 else 3764 vput(tdvp); 3765 vrele(fromnd.ni_dvp); 3766 vrele(fvp); 3767 } 3768 vrele(tond.ni_startdir); 3769 vn_finished_write(mp); 3770 out1: 3771 if (fromnd.ni_startdir) 3772 vrele(fromnd.ni_startdir); 3773 if (error == ERESTART) 3774 return (0); 3775 if (error == ERELOOKUP) 3776 goto again; 3777 return (error); 3778 } 3779 3780 /* 3781 * Make a directory file. 3782 */ 3783 #ifndef _SYS_SYSPROTO_H_ 3784 struct mkdir_args { 3785 char *path; 3786 int mode; 3787 }; 3788 #endif 3789 int 3790 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3791 { 3792 3793 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3794 uap->mode)); 3795 } 3796 3797 #ifndef _SYS_SYSPROTO_H_ 3798 struct mkdirat_args { 3799 int fd; 3800 char *path; 3801 mode_t mode; 3802 }; 3803 #endif 3804 int 3805 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3806 { 3807 3808 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3809 } 3810 3811 int 3812 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3813 int mode) 3814 { 3815 struct mount *mp; 3816 struct vattr vattr; 3817 struct nameidata nd; 3818 int error; 3819 3820 AUDIT_ARG_MODE(mode); 3821 NDPREINIT(&nd); 3822 restart: 3823 bwillwrite(); 3824 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3825 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR, 3826 segflg, path, fd, &cap_mkdirat_rights, td); 3827 if ((error = namei(&nd)) != 0) 3828 return (error); 3829 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3830 NDFREE(&nd, NDF_ONLY_PNBUF); 3831 vput(nd.ni_dvp); 3832 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3833 return (error); 3834 goto restart; 3835 } 3836 VATTR_NULL(&vattr); 3837 vattr.va_type = VDIR; 3838 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask; 3839 #ifdef MAC 3840 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3841 &vattr); 3842 if (error != 0) 3843 goto out; 3844 #endif 3845 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3846 #ifdef MAC 3847 out: 3848 #endif 3849 NDFREE(&nd, NDF_ONLY_PNBUF); 3850 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 3851 vn_finished_write(mp); 3852 if (error == ERELOOKUP) 3853 goto restart; 3854 return (error); 3855 } 3856 3857 /* 3858 * Remove a directory file. 3859 */ 3860 #ifndef _SYS_SYSPROTO_H_ 3861 struct rmdir_args { 3862 char *path; 3863 }; 3864 #endif 3865 int 3866 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3867 { 3868 3869 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3870 0)); 3871 } 3872 3873 int 3874 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3875 enum uio_seg pathseg, int flag) 3876 { 3877 struct mount *mp; 3878 struct vnode *vp; 3879 struct file *fp; 3880 struct nameidata nd; 3881 cap_rights_t rights; 3882 int error; 3883 3884 fp = NULL; 3885 if (fd != FD_NONE) { 3886 error = getvnode(td, fd, cap_rights_init_one(&rights, 3887 CAP_LOOKUP), &fp); 3888 if (error != 0) 3889 return (error); 3890 } 3891 3892 NDPREINIT(&nd); 3893 restart: 3894 bwillwrite(); 3895 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3896 at2cnpflags(flag, AT_RESOLVE_BENEATH), 3897 pathseg, path, dfd, &cap_unlinkat_rights, td); 3898 if ((error = namei(&nd)) != 0) 3899 goto fdout; 3900 vp = nd.ni_vp; 3901 if (vp->v_type != VDIR) { 3902 error = ENOTDIR; 3903 goto out; 3904 } 3905 /* 3906 * No rmdir "." please. 3907 */ 3908 if (nd.ni_dvp == vp) { 3909 error = EINVAL; 3910 goto out; 3911 } 3912 /* 3913 * The root of a mounted filesystem cannot be deleted. 3914 */ 3915 if (vp->v_vflag & VV_ROOT) { 3916 error = EBUSY; 3917 goto out; 3918 } 3919 3920 if (fp != NULL && fp->f_vnode != vp) { 3921 if (VN_IS_DOOMED(fp->f_vnode)) 3922 error = EBADF; 3923 else 3924 error = EDEADLK; 3925 goto out; 3926 } 3927 3928 #ifdef MAC 3929 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3930 &nd.ni_cnd); 3931 if (error != 0) 3932 goto out; 3933 #endif 3934 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3935 NDFREE(&nd, NDF_ONLY_PNBUF); 3936 vput(vp); 3937 if (nd.ni_dvp == vp) 3938 vrele(nd.ni_dvp); 3939 else 3940 vput(nd.ni_dvp); 3941 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3942 goto fdout; 3943 goto restart; 3944 } 3945 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3946 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3947 vn_finished_write(mp); 3948 out: 3949 NDFREE(&nd, NDF_ONLY_PNBUF); 3950 vput(vp); 3951 if (nd.ni_dvp == vp) 3952 vrele(nd.ni_dvp); 3953 else 3954 vput(nd.ni_dvp); 3955 if (error == ERELOOKUP) 3956 goto restart; 3957 fdout: 3958 if (fp != NULL) 3959 fdrop(fp, td); 3960 return (error); 3961 } 3962 3963 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3964 int 3965 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3966 long *basep, void (*func)(struct freebsd11_dirent *)) 3967 { 3968 struct freebsd11_dirent dstdp; 3969 struct dirent *dp, *edp; 3970 char *dirbuf; 3971 off_t base; 3972 ssize_t resid, ucount; 3973 int error; 3974 3975 /* XXX arbitrary sanity limit on `count'. */ 3976 count = min(count, 64 * 1024); 3977 3978 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3979 3980 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3981 UIO_SYSSPACE); 3982 if (error != 0) 3983 goto done; 3984 if (basep != NULL) 3985 *basep = base; 3986 3987 ucount = 0; 3988 for (dp = (struct dirent *)dirbuf, 3989 edp = (struct dirent *)&dirbuf[count - resid]; 3990 ucount < count && dp < edp; ) { 3991 if (dp->d_reclen == 0) 3992 break; 3993 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3994 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3995 continue; 3996 dstdp.d_type = dp->d_type; 3997 dstdp.d_namlen = dp->d_namlen; 3998 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3999 if (dstdp.d_fileno != dp->d_fileno) { 4000 switch (ino64_trunc_error) { 4001 default: 4002 case 0: 4003 break; 4004 case 1: 4005 error = EOVERFLOW; 4006 goto done; 4007 case 2: 4008 dstdp.d_fileno = UINT32_MAX; 4009 break; 4010 } 4011 } 4012 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 4013 ((dp->d_namlen + 1 + 3) &~ 3); 4014 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 4015 bzero(dstdp.d_name + dstdp.d_namlen, 4016 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 4017 dstdp.d_namlen); 4018 MPASS(dstdp.d_reclen <= dp->d_reclen); 4019 MPASS(ucount + dstdp.d_reclen <= count); 4020 if (func != NULL) 4021 func(&dstdp); 4022 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 4023 if (error != 0) 4024 break; 4025 dp = (struct dirent *)((char *)dp + dp->d_reclen); 4026 ucount += dstdp.d_reclen; 4027 } 4028 4029 done: 4030 free(dirbuf, M_TEMP); 4031 if (error == 0) 4032 td->td_retval[0] = ucount; 4033 return (error); 4034 } 4035 #endif /* COMPAT */ 4036 4037 #ifdef COMPAT_43 4038 static void 4039 ogetdirentries_cvt(struct freebsd11_dirent *dp) 4040 { 4041 #if (BYTE_ORDER == LITTLE_ENDIAN) 4042 /* 4043 * The expected low byte of dp->d_namlen is our dp->d_type. 4044 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 4045 */ 4046 dp->d_type = dp->d_namlen; 4047 dp->d_namlen = 0; 4048 #else 4049 /* 4050 * The dp->d_type is the high byte of the expected dp->d_namlen, 4051 * so must be zero'ed. 4052 */ 4053 dp->d_type = 0; 4054 #endif 4055 } 4056 4057 /* 4058 * Read a block of directory entries in a filesystem independent format. 4059 */ 4060 #ifndef _SYS_SYSPROTO_H_ 4061 struct ogetdirentries_args { 4062 int fd; 4063 char *buf; 4064 u_int count; 4065 long *basep; 4066 }; 4067 #endif 4068 int 4069 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 4070 { 4071 long loff; 4072 int error; 4073 4074 error = kern_ogetdirentries(td, uap, &loff); 4075 if (error == 0) 4076 error = copyout(&loff, uap->basep, sizeof(long)); 4077 return (error); 4078 } 4079 4080 int 4081 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 4082 long *ploff) 4083 { 4084 long base; 4085 int error; 4086 4087 /* XXX arbitrary sanity limit on `count'. */ 4088 if (uap->count > 64 * 1024) 4089 return (EINVAL); 4090 4091 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4092 &base, ogetdirentries_cvt); 4093 4094 if (error == 0 && uap->basep != NULL) 4095 error = copyout(&base, uap->basep, sizeof(long)); 4096 4097 return (error); 4098 } 4099 #endif /* COMPAT_43 */ 4100 4101 #if defined(COMPAT_FREEBSD11) 4102 #ifndef _SYS_SYSPROTO_H_ 4103 struct freebsd11_getdirentries_args { 4104 int fd; 4105 char *buf; 4106 u_int count; 4107 long *basep; 4108 }; 4109 #endif 4110 int 4111 freebsd11_getdirentries(struct thread *td, 4112 struct freebsd11_getdirentries_args *uap) 4113 { 4114 long base; 4115 int error; 4116 4117 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4118 &base, NULL); 4119 4120 if (error == 0 && uap->basep != NULL) 4121 error = copyout(&base, uap->basep, sizeof(long)); 4122 return (error); 4123 } 4124 4125 int 4126 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 4127 { 4128 struct freebsd11_getdirentries_args ap; 4129 4130 ap.fd = uap->fd; 4131 ap.buf = uap->buf; 4132 ap.count = uap->count; 4133 ap.basep = NULL; 4134 return (freebsd11_getdirentries(td, &ap)); 4135 } 4136 #endif /* COMPAT_FREEBSD11 */ 4137 4138 /* 4139 * Read a block of directory entries in a filesystem independent format. 4140 */ 4141 int 4142 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4143 { 4144 off_t base; 4145 int error; 4146 4147 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4148 NULL, UIO_USERSPACE); 4149 if (error != 0) 4150 return (error); 4151 if (uap->basep != NULL) 4152 error = copyout(&base, uap->basep, sizeof(off_t)); 4153 return (error); 4154 } 4155 4156 int 4157 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4158 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4159 { 4160 struct vnode *vp; 4161 struct file *fp; 4162 struct uio auio; 4163 struct iovec aiov; 4164 off_t loff; 4165 int error, eofflag; 4166 off_t foffset; 4167 4168 AUDIT_ARG_FD(fd); 4169 if (count > IOSIZE_MAX) 4170 return (EINVAL); 4171 auio.uio_resid = count; 4172 error = getvnode(td, fd, &cap_read_rights, &fp); 4173 if (error != 0) 4174 return (error); 4175 if ((fp->f_flag & FREAD) == 0) { 4176 fdrop(fp, td); 4177 return (EBADF); 4178 } 4179 vp = fp->f_vnode; 4180 foffset = foffset_lock(fp, 0); 4181 unionread: 4182 if (vp->v_type != VDIR) { 4183 error = EINVAL; 4184 goto fail; 4185 } 4186 aiov.iov_base = buf; 4187 aiov.iov_len = count; 4188 auio.uio_iov = &aiov; 4189 auio.uio_iovcnt = 1; 4190 auio.uio_rw = UIO_READ; 4191 auio.uio_segflg = bufseg; 4192 auio.uio_td = td; 4193 vn_lock(vp, LK_SHARED | LK_RETRY); 4194 AUDIT_ARG_VNODE1(vp); 4195 loff = auio.uio_offset = foffset; 4196 #ifdef MAC 4197 error = mac_vnode_check_readdir(td->td_ucred, vp); 4198 if (error == 0) 4199 #endif 4200 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4201 NULL); 4202 foffset = auio.uio_offset; 4203 if (error != 0) { 4204 VOP_UNLOCK(vp); 4205 goto fail; 4206 } 4207 if (count == auio.uio_resid && 4208 (vp->v_vflag & VV_ROOT) && 4209 (vp->v_mount->mnt_flag & MNT_UNION)) { 4210 struct vnode *tvp = vp; 4211 4212 vp = vp->v_mount->mnt_vnodecovered; 4213 VREF(vp); 4214 fp->f_vnode = vp; 4215 foffset = 0; 4216 vput(tvp); 4217 goto unionread; 4218 } 4219 VOP_UNLOCK(vp); 4220 *basep = loff; 4221 if (residp != NULL) 4222 *residp = auio.uio_resid; 4223 td->td_retval[0] = count - auio.uio_resid; 4224 fail: 4225 foffset_unlock(fp, foffset, 0); 4226 fdrop(fp, td); 4227 return (error); 4228 } 4229 4230 /* 4231 * Set the mode mask for creation of filesystem nodes. 4232 */ 4233 #ifndef _SYS_SYSPROTO_H_ 4234 struct umask_args { 4235 int newmask; 4236 }; 4237 #endif 4238 int 4239 sys_umask(struct thread *td, struct umask_args *uap) 4240 { 4241 struct pwddesc *pdp; 4242 4243 pdp = td->td_proc->p_pd; 4244 PWDDESC_XLOCK(pdp); 4245 td->td_retval[0] = pdp->pd_cmask; 4246 pdp->pd_cmask = uap->newmask & ALLPERMS; 4247 PWDDESC_XUNLOCK(pdp); 4248 return (0); 4249 } 4250 4251 /* 4252 * Void all references to file by ripping underlying filesystem away from 4253 * vnode. 4254 */ 4255 #ifndef _SYS_SYSPROTO_H_ 4256 struct revoke_args { 4257 char *path; 4258 }; 4259 #endif 4260 int 4261 sys_revoke(struct thread *td, struct revoke_args *uap) 4262 { 4263 struct vnode *vp; 4264 struct vattr vattr; 4265 struct nameidata nd; 4266 int error; 4267 4268 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4269 uap->path, td); 4270 if ((error = namei(&nd)) != 0) 4271 return (error); 4272 vp = nd.ni_vp; 4273 NDFREE_NOTHING(&nd); 4274 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4275 error = EINVAL; 4276 goto out; 4277 } 4278 #ifdef MAC 4279 error = mac_vnode_check_revoke(td->td_ucred, vp); 4280 if (error != 0) 4281 goto out; 4282 #endif 4283 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4284 if (error != 0) 4285 goto out; 4286 if (td->td_ucred->cr_uid != vattr.va_uid) { 4287 error = priv_check(td, PRIV_VFS_ADMIN); 4288 if (error != 0) 4289 goto out; 4290 } 4291 if (devfs_usecount(vp) > 0) 4292 VOP_REVOKE(vp, REVOKEALL); 4293 out: 4294 vput(vp); 4295 return (error); 4296 } 4297 4298 /* 4299 * This variant of getvnode() allows O_PATH files. Caller should 4300 * ensure that returned file and vnode are only used for compatible 4301 * semantics. 4302 */ 4303 int 4304 getvnode_path(struct thread *td, int fd, cap_rights_t *rightsp, 4305 struct file **fpp) 4306 { 4307 struct file *fp; 4308 int error; 4309 4310 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp); 4311 if (error != 0) 4312 return (error); 4313 4314 /* 4315 * The file could be not of the vnode type, or it may be not 4316 * yet fully initialized, in which case the f_vnode pointer 4317 * may be set, but f_ops is still badfileops. E.g., 4318 * devfs_open() transiently create such situation to 4319 * facilitate csw d_fdopen(). 4320 * 4321 * Dupfdopen() handling in kern_openat() installs the 4322 * half-baked file into the process descriptor table, allowing 4323 * other thread to dereference it. Guard against the race by 4324 * checking f_ops. 4325 */ 4326 if (__predict_false(fp->f_vnode == NULL || fp->f_ops == &badfileops)) { 4327 fdrop(fp, td); 4328 return (EINVAL); 4329 } 4330 4331 *fpp = fp; 4332 return (0); 4333 } 4334 4335 /* 4336 * Convert a user file descriptor to a kernel file entry and check 4337 * that, if it is a capability, the correct rights are present. 4338 * A reference on the file entry is held upon returning. 4339 */ 4340 int 4341 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4342 { 4343 int error; 4344 4345 error = getvnode_path(td, fd, rightsp, fpp); 4346 if (__predict_false(error != 0)) 4347 return (error); 4348 4349 /* 4350 * Filter out O_PATH file descriptors, most getvnode() callers 4351 * do not call fo_ methods. 4352 */ 4353 if (__predict_false((*fpp)->f_ops == &path_fileops)) { 4354 fdrop(*fpp, td); 4355 error = EBADF; 4356 } 4357 4358 return (error); 4359 } 4360 4361 /* 4362 * Get an (NFS) file handle. 4363 */ 4364 #ifndef _SYS_SYSPROTO_H_ 4365 struct lgetfh_args { 4366 char *fname; 4367 fhandle_t *fhp; 4368 }; 4369 #endif 4370 int 4371 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4372 { 4373 4374 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4375 UIO_USERSPACE, uap->fhp, UIO_USERSPACE)); 4376 } 4377 4378 #ifndef _SYS_SYSPROTO_H_ 4379 struct getfh_args { 4380 char *fname; 4381 fhandle_t *fhp; 4382 }; 4383 #endif 4384 int 4385 sys_getfh(struct thread *td, struct getfh_args *uap) 4386 { 4387 4388 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4389 uap->fhp, UIO_USERSPACE)); 4390 } 4391 4392 /* 4393 * syscall for the rpc.lockd to use to translate an open descriptor into 4394 * a NFS file handle. 4395 * 4396 * warning: do not remove the priv_check() call or this becomes one giant 4397 * security hole. 4398 */ 4399 #ifndef _SYS_SYSPROTO_H_ 4400 struct getfhat_args { 4401 int fd; 4402 char *path; 4403 fhandle_t *fhp; 4404 int flags; 4405 }; 4406 #endif 4407 int 4408 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4409 { 4410 4411 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4412 uap->fhp, UIO_USERSPACE)); 4413 } 4414 4415 int 4416 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4417 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg) 4418 { 4419 struct nameidata nd; 4420 fhandle_t fh; 4421 struct vnode *vp; 4422 int error; 4423 4424 if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4425 return (EINVAL); 4426 error = priv_check(td, PRIV_VFS_GETFH); 4427 if (error != 0) 4428 return (error); 4429 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4430 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4431 fd, td); 4432 error = namei(&nd); 4433 if (error != 0) 4434 return (error); 4435 NDFREE_NOTHING(&nd); 4436 vp = nd.ni_vp; 4437 bzero(&fh, sizeof(fh)); 4438 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4439 error = VOP_VPTOFH(vp, &fh.fh_fid); 4440 vput(vp); 4441 if (error == 0) { 4442 if (fhseg == UIO_USERSPACE) 4443 error = copyout(&fh, fhp, sizeof (fh)); 4444 else 4445 memcpy(fhp, &fh, sizeof(fh)); 4446 } 4447 return (error); 4448 } 4449 4450 #ifndef _SYS_SYSPROTO_H_ 4451 struct fhlink_args { 4452 fhandle_t *fhp; 4453 const char *to; 4454 }; 4455 #endif 4456 int 4457 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4458 { 4459 4460 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4461 } 4462 4463 #ifndef _SYS_SYSPROTO_H_ 4464 struct fhlinkat_args { 4465 fhandle_t *fhp; 4466 int tofd; 4467 const char *to; 4468 }; 4469 #endif 4470 int 4471 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4472 { 4473 4474 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4475 } 4476 4477 static int 4478 kern_fhlinkat(struct thread *td, int fd, const char *path, 4479 enum uio_seg pathseg, fhandle_t *fhp) 4480 { 4481 fhandle_t fh; 4482 struct mount *mp; 4483 struct vnode *vp; 4484 int error; 4485 4486 error = priv_check(td, PRIV_VFS_GETFH); 4487 if (error != 0) 4488 return (error); 4489 error = copyin(fhp, &fh, sizeof(fh)); 4490 if (error != 0) 4491 return (error); 4492 do { 4493 bwillwrite(); 4494 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4495 return (ESTALE); 4496 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4497 vfs_unbusy(mp); 4498 if (error != 0) 4499 return (error); 4500 VOP_UNLOCK(vp); 4501 error = kern_linkat_vp(td, vp, fd, path, pathseg); 4502 } while (error == EAGAIN || error == ERELOOKUP); 4503 return (error); 4504 } 4505 4506 #ifndef _SYS_SYSPROTO_H_ 4507 struct fhreadlink_args { 4508 fhandle_t *fhp; 4509 char *buf; 4510 size_t bufsize; 4511 }; 4512 #endif 4513 int 4514 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4515 { 4516 fhandle_t fh; 4517 struct mount *mp; 4518 struct vnode *vp; 4519 int error; 4520 4521 error = priv_check(td, PRIV_VFS_GETFH); 4522 if (error != 0) 4523 return (error); 4524 if (uap->bufsize > IOSIZE_MAX) 4525 return (EINVAL); 4526 error = copyin(uap->fhp, &fh, sizeof(fh)); 4527 if (error != 0) 4528 return (error); 4529 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4530 return (ESTALE); 4531 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4532 vfs_unbusy(mp); 4533 if (error != 0) 4534 return (error); 4535 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4536 vput(vp); 4537 return (error); 4538 } 4539 4540 /* 4541 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4542 * open descriptor. 4543 * 4544 * warning: do not remove the priv_check() call or this becomes one giant 4545 * security hole. 4546 */ 4547 #ifndef _SYS_SYSPROTO_H_ 4548 struct fhopen_args { 4549 const struct fhandle *u_fhp; 4550 int flags; 4551 }; 4552 #endif 4553 int 4554 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4555 { 4556 return (kern_fhopen(td, uap->u_fhp, uap->flags)); 4557 } 4558 4559 int 4560 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags) 4561 { 4562 struct mount *mp; 4563 struct vnode *vp; 4564 struct fhandle fhp; 4565 struct file *fp; 4566 int fmode, error; 4567 int indx; 4568 4569 error = priv_check(td, PRIV_VFS_FHOPEN); 4570 if (error != 0) 4571 return (error); 4572 indx = -1; 4573 fmode = FFLAGS(flags); 4574 /* why not allow a non-read/write open for our lockd? */ 4575 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4576 return (EINVAL); 4577 error = copyin(u_fhp, &fhp, sizeof(fhp)); 4578 if (error != 0) 4579 return(error); 4580 /* find the mount point */ 4581 mp = vfs_busyfs(&fhp.fh_fsid); 4582 if (mp == NULL) 4583 return (ESTALE); 4584 /* now give me my vnode, it gets returned to me locked */ 4585 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4586 vfs_unbusy(mp); 4587 if (error != 0) 4588 return (error); 4589 4590 error = falloc_noinstall(td, &fp); 4591 if (error != 0) { 4592 vput(vp); 4593 return (error); 4594 } 4595 /* 4596 * An extra reference on `fp' has been held for us by 4597 * falloc_noinstall(). 4598 */ 4599 4600 #ifdef INVARIANTS 4601 td->td_dupfd = -1; 4602 #endif 4603 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4604 if (error != 0) { 4605 KASSERT(fp->f_ops == &badfileops, 4606 ("VOP_OPEN in fhopen() set f_ops")); 4607 KASSERT(td->td_dupfd < 0, 4608 ("fhopen() encountered fdopen()")); 4609 4610 vput(vp); 4611 goto bad; 4612 } 4613 #ifdef INVARIANTS 4614 td->td_dupfd = 0; 4615 #endif 4616 fp->f_vnode = vp; 4617 finit_vnode(fp, fmode, NULL, &vnops); 4618 VOP_UNLOCK(vp); 4619 if ((fmode & O_TRUNC) != 0) { 4620 error = fo_truncate(fp, 0, td->td_ucred, td); 4621 if (error != 0) 4622 goto bad; 4623 } 4624 4625 error = finstall(td, fp, &indx, fmode, NULL); 4626 bad: 4627 fdrop(fp, td); 4628 td->td_retval[0] = indx; 4629 return (error); 4630 } 4631 4632 /* 4633 * Stat an (NFS) file handle. 4634 */ 4635 #ifndef _SYS_SYSPROTO_H_ 4636 struct fhstat_args { 4637 struct fhandle *u_fhp; 4638 struct stat *sb; 4639 }; 4640 #endif 4641 int 4642 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4643 { 4644 struct stat sb; 4645 struct fhandle fh; 4646 int error; 4647 4648 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4649 if (error != 0) 4650 return (error); 4651 error = kern_fhstat(td, fh, &sb); 4652 if (error == 0) 4653 error = copyout(&sb, uap->sb, sizeof(sb)); 4654 return (error); 4655 } 4656 4657 int 4658 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4659 { 4660 struct mount *mp; 4661 struct vnode *vp; 4662 int error; 4663 4664 error = priv_check(td, PRIV_VFS_FHSTAT); 4665 if (error != 0) 4666 return (error); 4667 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4668 return (ESTALE); 4669 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4670 vfs_unbusy(mp); 4671 if (error != 0) 4672 return (error); 4673 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED); 4674 vput(vp); 4675 return (error); 4676 } 4677 4678 /* 4679 * Implement fstatfs() for (NFS) file handles. 4680 */ 4681 #ifndef _SYS_SYSPROTO_H_ 4682 struct fhstatfs_args { 4683 struct fhandle *u_fhp; 4684 struct statfs *buf; 4685 }; 4686 #endif 4687 int 4688 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4689 { 4690 struct statfs *sfp; 4691 fhandle_t fh; 4692 int error; 4693 4694 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4695 if (error != 0) 4696 return (error); 4697 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4698 error = kern_fhstatfs(td, fh, sfp); 4699 if (error == 0) 4700 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4701 free(sfp, M_STATFS); 4702 return (error); 4703 } 4704 4705 int 4706 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4707 { 4708 struct mount *mp; 4709 struct vnode *vp; 4710 int error; 4711 4712 error = priv_check(td, PRIV_VFS_FHSTATFS); 4713 if (error != 0) 4714 return (error); 4715 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4716 return (ESTALE); 4717 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4718 if (error != 0) { 4719 vfs_unbusy(mp); 4720 return (error); 4721 } 4722 vput(vp); 4723 error = prison_canseemount(td->td_ucred, mp); 4724 if (error != 0) 4725 goto out; 4726 #ifdef MAC 4727 error = mac_mount_check_stat(td->td_ucred, mp); 4728 if (error != 0) 4729 goto out; 4730 #endif 4731 error = VFS_STATFS(mp, buf); 4732 out: 4733 vfs_unbusy(mp); 4734 return (error); 4735 } 4736 4737 /* 4738 * Unlike madvise(2), we do not make a best effort to remember every 4739 * possible caching hint. Instead, we remember the last setting with 4740 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4741 * region of any current setting. 4742 */ 4743 int 4744 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4745 int advice) 4746 { 4747 struct fadvise_info *fa, *new; 4748 struct file *fp; 4749 struct vnode *vp; 4750 off_t end; 4751 int error; 4752 4753 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4754 return (EINVAL); 4755 AUDIT_ARG_VALUE(advice); 4756 switch (advice) { 4757 case POSIX_FADV_SEQUENTIAL: 4758 case POSIX_FADV_RANDOM: 4759 case POSIX_FADV_NOREUSE: 4760 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4761 break; 4762 case POSIX_FADV_NORMAL: 4763 case POSIX_FADV_WILLNEED: 4764 case POSIX_FADV_DONTNEED: 4765 new = NULL; 4766 break; 4767 default: 4768 return (EINVAL); 4769 } 4770 /* XXX: CAP_POSIX_FADVISE? */ 4771 AUDIT_ARG_FD(fd); 4772 error = fget(td, fd, &cap_no_rights, &fp); 4773 if (error != 0) 4774 goto out; 4775 AUDIT_ARG_FILE(td->td_proc, fp); 4776 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4777 error = ESPIPE; 4778 goto out; 4779 } 4780 if (fp->f_type != DTYPE_VNODE) { 4781 error = ENODEV; 4782 goto out; 4783 } 4784 vp = fp->f_vnode; 4785 if (vp->v_type != VREG) { 4786 error = ENODEV; 4787 goto out; 4788 } 4789 if (len == 0) 4790 end = OFF_MAX; 4791 else 4792 end = offset + len - 1; 4793 switch (advice) { 4794 case POSIX_FADV_SEQUENTIAL: 4795 case POSIX_FADV_RANDOM: 4796 case POSIX_FADV_NOREUSE: 4797 /* 4798 * Try to merge any existing non-standard region with 4799 * this new region if possible, otherwise create a new 4800 * non-standard region for this request. 4801 */ 4802 mtx_pool_lock(mtxpool_sleep, fp); 4803 fa = fp->f_advice; 4804 if (fa != NULL && fa->fa_advice == advice && 4805 ((fa->fa_start <= end && fa->fa_end >= offset) || 4806 (end != OFF_MAX && fa->fa_start == end + 1) || 4807 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4808 if (offset < fa->fa_start) 4809 fa->fa_start = offset; 4810 if (end > fa->fa_end) 4811 fa->fa_end = end; 4812 } else { 4813 new->fa_advice = advice; 4814 new->fa_start = offset; 4815 new->fa_end = end; 4816 fp->f_advice = new; 4817 new = fa; 4818 } 4819 mtx_pool_unlock(mtxpool_sleep, fp); 4820 break; 4821 case POSIX_FADV_NORMAL: 4822 /* 4823 * If a the "normal" region overlaps with an existing 4824 * non-standard region, trim or remove the 4825 * non-standard region. 4826 */ 4827 mtx_pool_lock(mtxpool_sleep, fp); 4828 fa = fp->f_advice; 4829 if (fa != NULL) { 4830 if (offset <= fa->fa_start && end >= fa->fa_end) { 4831 new = fa; 4832 fp->f_advice = NULL; 4833 } else if (offset <= fa->fa_start && 4834 end >= fa->fa_start) 4835 fa->fa_start = end + 1; 4836 else if (offset <= fa->fa_end && end >= fa->fa_end) 4837 fa->fa_end = offset - 1; 4838 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4839 /* 4840 * If the "normal" region is a middle 4841 * portion of the existing 4842 * non-standard region, just remove 4843 * the whole thing rather than picking 4844 * one side or the other to 4845 * preserve. 4846 */ 4847 new = fa; 4848 fp->f_advice = NULL; 4849 } 4850 } 4851 mtx_pool_unlock(mtxpool_sleep, fp); 4852 break; 4853 case POSIX_FADV_WILLNEED: 4854 case POSIX_FADV_DONTNEED: 4855 error = VOP_ADVISE(vp, offset, end, advice); 4856 break; 4857 } 4858 out: 4859 if (fp != NULL) 4860 fdrop(fp, td); 4861 free(new, M_FADVISE); 4862 return (error); 4863 } 4864 4865 int 4866 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4867 { 4868 int error; 4869 4870 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4871 uap->advice); 4872 return (kern_posix_error(td, error)); 4873 } 4874 4875 int 4876 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 4877 off_t *outoffp, size_t len, unsigned int flags) 4878 { 4879 struct file *infp, *outfp; 4880 struct vnode *invp, *outvp; 4881 int error; 4882 size_t retlen; 4883 void *rl_rcookie, *rl_wcookie; 4884 off_t savinoff, savoutoff; 4885 4886 infp = outfp = NULL; 4887 rl_rcookie = rl_wcookie = NULL; 4888 savinoff = -1; 4889 error = 0; 4890 retlen = 0; 4891 4892 if (flags != 0) { 4893 error = EINVAL; 4894 goto out; 4895 } 4896 if (len > SSIZE_MAX) 4897 /* 4898 * Although the len argument is size_t, the return argument 4899 * is ssize_t (which is signed). Therefore a size that won't 4900 * fit in ssize_t can't be returned. 4901 */ 4902 len = SSIZE_MAX; 4903 4904 /* Get the file structures for the file descriptors. */ 4905 error = fget_read(td, infd, &cap_read_rights, &infp); 4906 if (error != 0) 4907 goto out; 4908 if (infp->f_ops == &badfileops) { 4909 error = EBADF; 4910 goto out; 4911 } 4912 if (infp->f_vnode == NULL) { 4913 error = EINVAL; 4914 goto out; 4915 } 4916 error = fget_write(td, outfd, &cap_write_rights, &outfp); 4917 if (error != 0) 4918 goto out; 4919 if (outfp->f_ops == &badfileops) { 4920 error = EBADF; 4921 goto out; 4922 } 4923 if (outfp->f_vnode == NULL) { 4924 error = EINVAL; 4925 goto out; 4926 } 4927 4928 /* Set the offset pointers to the correct place. */ 4929 if (inoffp == NULL) 4930 inoffp = &infp->f_offset; 4931 if (outoffp == NULL) 4932 outoffp = &outfp->f_offset; 4933 savinoff = *inoffp; 4934 savoutoff = *outoffp; 4935 4936 invp = infp->f_vnode; 4937 outvp = outfp->f_vnode; 4938 /* Sanity check the f_flag bits. */ 4939 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 4940 (infp->f_flag & FREAD) == 0) { 4941 error = EBADF; 4942 goto out; 4943 } 4944 4945 /* If len == 0, just return 0. */ 4946 if (len == 0) 4947 goto out; 4948 4949 /* 4950 * If infp and outfp refer to the same file, the byte ranges cannot 4951 * overlap. 4952 */ 4953 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len > 4954 savoutoff) || (savinoff > savoutoff && savoutoff + len > 4955 savinoff))) { 4956 error = EINVAL; 4957 goto out; 4958 } 4959 4960 /* Range lock the byte ranges for both invp and outvp. */ 4961 for (;;) { 4962 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp + 4963 len); 4964 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp + 4965 len); 4966 if (rl_rcookie != NULL) 4967 break; 4968 vn_rangelock_unlock(outvp, rl_wcookie); 4969 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len); 4970 vn_rangelock_unlock(invp, rl_rcookie); 4971 } 4972 4973 retlen = len; 4974 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen, 4975 flags, infp->f_cred, outfp->f_cred, td); 4976 out: 4977 if (rl_rcookie != NULL) 4978 vn_rangelock_unlock(invp, rl_rcookie); 4979 if (rl_wcookie != NULL) 4980 vn_rangelock_unlock(outvp, rl_wcookie); 4981 if (savinoff != -1 && (error == EINTR || error == ERESTART)) { 4982 *inoffp = savinoff; 4983 *outoffp = savoutoff; 4984 } 4985 if (outfp != NULL) 4986 fdrop(outfp, td); 4987 if (infp != NULL) 4988 fdrop(infp, td); 4989 td->td_retval[0] = retlen; 4990 return (error); 4991 } 4992 4993 int 4994 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 4995 { 4996 off_t inoff, outoff, *inoffp, *outoffp; 4997 int error; 4998 4999 inoffp = outoffp = NULL; 5000 if (uap->inoffp != NULL) { 5001 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 5002 if (error != 0) 5003 return (error); 5004 inoffp = &inoff; 5005 } 5006 if (uap->outoffp != NULL) { 5007 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 5008 if (error != 0) 5009 return (error); 5010 outoffp = &outoff; 5011 } 5012 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 5013 outoffp, uap->len, uap->flags); 5014 if (error == 0 && uap->inoffp != NULL) 5015 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 5016 if (error == 0 && uap->outoffp != NULL) 5017 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 5018 return (error); 5019 } 5020