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