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