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