Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_syscalls.c
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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_RESOLVE_BENEATH) != 0) 124 res |= RBENEATH; 125 if ((at_flags & AT_SYMLINK_FOLLOW) != 0) 126 res |= FOLLOW; 127 /* NOFOLLOW is pseudo flag */ 128 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) { 129 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 130 FOLLOW; 131 } 132 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0) 133 res |= EMPTYPATH; 134 return (res); 135 } 136 137 int 138 kern_sync(struct thread *td) 139 { 140 struct mount *mp, *nmp; 141 int save; 142 143 mtx_lock(&mountlist_mtx); 144 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 145 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 146 nmp = TAILQ_NEXT(mp, mnt_list); 147 continue; 148 } 149 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 150 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 151 save = curthread_pflags_set(TDP_SYNCIO); 152 vfs_periodic(mp, MNT_NOWAIT); 153 VFS_SYNC(mp, MNT_NOWAIT); 154 curthread_pflags_restore(save); 155 vn_finished_write(mp); 156 } 157 mtx_lock(&mountlist_mtx); 158 nmp = TAILQ_NEXT(mp, mnt_list); 159 vfs_unbusy(mp); 160 } 161 mtx_unlock(&mountlist_mtx); 162 return (0); 163 } 164 165 /* 166 * Sync each mounted filesystem. 167 */ 168 #ifndef _SYS_SYSPROTO_H_ 169 struct sync_args { 170 int dummy; 171 }; 172 #endif 173 /* ARGSUSED */ 174 int 175 sys_sync(struct thread *td, struct sync_args *uap) 176 { 177 178 return (kern_sync(td)); 179 } 180 181 /* 182 * Change filesystem quotas. 183 */ 184 #ifndef _SYS_SYSPROTO_H_ 185 struct quotactl_args { 186 char *path; 187 int cmd; 188 int uid; 189 caddr_t arg; 190 }; 191 #endif 192 int 193 sys_quotactl(struct thread *td, struct quotactl_args *uap) 194 { 195 struct mount *mp; 196 struct nameidata nd; 197 int error; 198 199 AUDIT_ARG_CMD(uap->cmd); 200 AUDIT_ARG_UID(uap->uid); 201 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 202 return (EPERM); 203 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 204 uap->path, td); 205 if ((error = namei(&nd)) != 0) 206 return (error); 207 NDFREE(&nd, NDF_ONLY_PNBUF); 208 mp = nd.ni_vp->v_mount; 209 vfs_ref(mp); 210 vput(nd.ni_vp); 211 error = vfs_busy(mp, 0); 212 if (error != 0) { 213 vfs_rel(mp); 214 return (error); 215 } 216 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); 217 218 /* 219 * Since quota on operation typically needs to open quota 220 * file, the Q_QUOTAON handler needs to unbusy the mount point 221 * before calling into namei. Otherwise, unmount might be 222 * started between two vfs_busy() invocations (first is our, 223 * second is from mount point cross-walk code in lookup()), 224 * causing deadlock. 225 * 226 * Require that Q_QUOTAON handles the vfs_busy() reference on 227 * its own, always returning with ubusied mount point. 228 */ 229 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON && 230 (uap->cmd >> SUBCMDSHIFT) != Q_QUOTAOFF) 231 vfs_unbusy(mp); 232 vfs_rel(mp); 233 return (error); 234 } 235 236 /* 237 * Used by statfs conversion routines to scale the block size up if 238 * necessary so that all of the block counts are <= 'max_size'. Note 239 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 240 * value of 'n'. 241 */ 242 void 243 statfs_scale_blocks(struct statfs *sf, long max_size) 244 { 245 uint64_t count; 246 int shift; 247 248 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 249 250 /* 251 * Attempt to scale the block counts to give a more accurate 252 * overview to userland of the ratio of free space to used 253 * space. To do this, find the largest block count and compute 254 * a divisor that lets it fit into a signed integer <= max_size. 255 */ 256 if (sf->f_bavail < 0) 257 count = -sf->f_bavail; 258 else 259 count = sf->f_bavail; 260 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 261 if (count <= max_size) 262 return; 263 264 count >>= flsl(max_size); 265 shift = 0; 266 while (count > 0) { 267 shift++; 268 count >>=1; 269 } 270 271 sf->f_bsize <<= shift; 272 sf->f_blocks >>= shift; 273 sf->f_bfree >>= shift; 274 sf->f_bavail >>= shift; 275 } 276 277 static int 278 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 279 { 280 int error; 281 282 if (mp == NULL) 283 return (EBADF); 284 error = vfs_busy(mp, 0); 285 vfs_rel(mp); 286 if (error != 0) 287 return (error); 288 #ifdef MAC 289 error = mac_mount_check_stat(td->td_ucred, mp); 290 if (error != 0) 291 goto out; 292 #endif 293 error = VFS_STATFS(mp, buf); 294 if (error != 0) 295 goto out; 296 if (priv_check_cred_vfs_generation(td->td_ucred)) { 297 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 298 prison_enforce_statfs(td->td_ucred, mp, buf); 299 } 300 out: 301 vfs_unbusy(mp); 302 return (error); 303 } 304 305 /* 306 * Get filesystem statistics. 307 */ 308 #ifndef _SYS_SYSPROTO_H_ 309 struct statfs_args { 310 char *path; 311 struct statfs *buf; 312 }; 313 #endif 314 int 315 sys_statfs(struct thread *td, struct statfs_args *uap) 316 { 317 struct statfs *sfp; 318 int error; 319 320 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 321 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 322 if (error == 0) 323 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 324 free(sfp, M_STATFS); 325 return (error); 326 } 327 328 int 329 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg, 330 struct statfs *buf) 331 { 332 struct mount *mp; 333 struct nameidata nd; 334 int error; 335 336 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 337 error = namei(&nd); 338 if (error != 0) 339 return (error); 340 mp = vfs_ref_from_vp(nd.ni_vp); 341 NDFREE_NOTHING(&nd); 342 vrele(nd.ni_vp); 343 return (kern_do_statfs(td, mp, buf)); 344 } 345 346 /* 347 * Get filesystem statistics. 348 */ 349 #ifndef _SYS_SYSPROTO_H_ 350 struct fstatfs_args { 351 int fd; 352 struct statfs *buf; 353 }; 354 #endif 355 int 356 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 357 { 358 struct statfs *sfp; 359 int error; 360 361 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 362 error = kern_fstatfs(td, uap->fd, sfp); 363 if (error == 0) 364 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 365 free(sfp, M_STATFS); 366 return (error); 367 } 368 369 int 370 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 371 { 372 struct file *fp; 373 struct mount *mp; 374 struct vnode *vp; 375 int error; 376 377 AUDIT_ARG_FD(fd); 378 error = getvnode_path(td, fd, &cap_fstatfs_rights, &fp); 379 if (error != 0) 380 return (error); 381 vp = fp->f_vnode; 382 #ifdef AUDIT 383 if (AUDITING_TD(td)) { 384 vn_lock(vp, LK_SHARED | LK_RETRY); 385 AUDIT_ARG_VNODE1(vp); 386 VOP_UNLOCK(vp); 387 } 388 #endif 389 mp = vfs_ref_from_vp(vp); 390 fdrop(fp, td); 391 return (kern_do_statfs(td, mp, buf)); 392 } 393 394 /* 395 * Get statistics on all filesystems. 396 */ 397 #ifndef _SYS_SYSPROTO_H_ 398 struct getfsstat_args { 399 struct statfs *buf; 400 long bufsize; 401 int mode; 402 }; 403 #endif 404 int 405 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 406 { 407 size_t count; 408 int error; 409 410 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 411 return (EINVAL); 412 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 413 UIO_USERSPACE, uap->mode); 414 if (error == 0) 415 td->td_retval[0] = count; 416 return (error); 417 } 418 419 /* 420 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 421 * The caller is responsible for freeing memory which will be allocated 422 * in '*buf'. 423 */ 424 int 425 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 426 size_t *countp, enum uio_seg bufseg, int mode) 427 { 428 struct mount *mp, *nmp; 429 struct statfs *sfsp, *sp, *sptmp, *tofree; 430 size_t count, maxcount; 431 int error; 432 433 switch (mode) { 434 case MNT_WAIT: 435 case MNT_NOWAIT: 436 break; 437 default: 438 if (bufseg == UIO_SYSSPACE) 439 *buf = NULL; 440 return (EINVAL); 441 } 442 restart: 443 maxcount = bufsize / sizeof(struct statfs); 444 if (bufsize == 0) { 445 sfsp = NULL; 446 tofree = NULL; 447 } else if (bufseg == UIO_USERSPACE) { 448 sfsp = *buf; 449 tofree = NULL; 450 } else /* if (bufseg == UIO_SYSSPACE) */ { 451 count = 0; 452 mtx_lock(&mountlist_mtx); 453 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 454 count++; 455 } 456 mtx_unlock(&mountlist_mtx); 457 if (maxcount > count) 458 maxcount = count; 459 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 460 M_STATFS, M_WAITOK); 461 } 462 463 count = 0; 464 465 /* 466 * If there is no target buffer they only want the count. 467 * 468 * This could be TAILQ_FOREACH but it is open-coded to match the original 469 * code below. 470 */ 471 if (sfsp == NULL) { 472 mtx_lock(&mountlist_mtx); 473 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 474 if (prison_canseemount(td->td_ucred, mp) != 0) { 475 nmp = TAILQ_NEXT(mp, mnt_list); 476 continue; 477 } 478 #ifdef MAC 479 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 480 nmp = TAILQ_NEXT(mp, mnt_list); 481 continue; 482 } 483 #endif 484 count++; 485 nmp = TAILQ_NEXT(mp, mnt_list); 486 } 487 mtx_unlock(&mountlist_mtx); 488 *countp = count; 489 return (0); 490 } 491 492 /* 493 * They want the entire thing. 494 * 495 * Short-circuit the corner case of no room for anything, avoids 496 * relocking below. 497 */ 498 if (maxcount < 1) { 499 goto out; 500 } 501 502 mtx_lock(&mountlist_mtx); 503 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 504 if (prison_canseemount(td->td_ucred, mp) != 0) { 505 nmp = TAILQ_NEXT(mp, mnt_list); 506 continue; 507 } 508 #ifdef MAC 509 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 510 nmp = TAILQ_NEXT(mp, mnt_list); 511 continue; 512 } 513 #endif 514 if (mode == MNT_WAIT) { 515 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 516 /* 517 * If vfs_busy() failed, and MBF_NOWAIT 518 * wasn't passed, then the mp is gone. 519 * Furthermore, because of MBF_MNTLSTLOCK, 520 * the mountlist_mtx was dropped. We have 521 * no other choice than to start over. 522 */ 523 mtx_unlock(&mountlist_mtx); 524 free(tofree, M_STATFS); 525 goto restart; 526 } 527 } else { 528 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 529 nmp = TAILQ_NEXT(mp, mnt_list); 530 continue; 531 } 532 } 533 sp = &mp->mnt_stat; 534 /* 535 * If MNT_NOWAIT is specified, do not refresh 536 * the fsstat cache. 537 */ 538 if (mode != MNT_NOWAIT) { 539 error = VFS_STATFS(mp, sp); 540 if (error != 0) { 541 mtx_lock(&mountlist_mtx); 542 nmp = TAILQ_NEXT(mp, mnt_list); 543 vfs_unbusy(mp); 544 continue; 545 } 546 } 547 if (priv_check_cred_vfs_generation(td->td_ucred)) { 548 sptmp = malloc(sizeof(struct statfs), M_STATFS, 549 M_WAITOK); 550 *sptmp = *sp; 551 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 552 prison_enforce_statfs(td->td_ucred, mp, sptmp); 553 sp = sptmp; 554 } else 555 sptmp = NULL; 556 if (bufseg == UIO_SYSSPACE) { 557 bcopy(sp, sfsp, sizeof(*sp)); 558 free(sptmp, M_STATFS); 559 } else /* if (bufseg == UIO_USERSPACE) */ { 560 error = copyout(sp, sfsp, sizeof(*sp)); 561 free(sptmp, M_STATFS); 562 if (error != 0) { 563 vfs_unbusy(mp); 564 return (error); 565 } 566 } 567 sfsp++; 568 count++; 569 570 if (count == maxcount) { 571 vfs_unbusy(mp); 572 goto out; 573 } 574 575 mtx_lock(&mountlist_mtx); 576 nmp = TAILQ_NEXT(mp, mnt_list); 577 vfs_unbusy(mp); 578 } 579 mtx_unlock(&mountlist_mtx); 580 out: 581 *countp = count; 582 return (0); 583 } 584 585 #ifdef COMPAT_FREEBSD4 586 /* 587 * Get old format filesystem statistics. 588 */ 589 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 590 591 #ifndef _SYS_SYSPROTO_H_ 592 struct freebsd4_statfs_args { 593 char *path; 594 struct ostatfs *buf; 595 }; 596 #endif 597 int 598 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 599 { 600 struct ostatfs osb; 601 struct statfs *sfp; 602 int error; 603 604 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 605 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 606 if (error == 0) { 607 freebsd4_cvtstatfs(sfp, &osb); 608 error = copyout(&osb, uap->buf, sizeof(osb)); 609 } 610 free(sfp, M_STATFS); 611 return (error); 612 } 613 614 /* 615 * Get filesystem statistics. 616 */ 617 #ifndef _SYS_SYSPROTO_H_ 618 struct freebsd4_fstatfs_args { 619 int fd; 620 struct ostatfs *buf; 621 }; 622 #endif 623 int 624 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 625 { 626 struct ostatfs osb; 627 struct statfs *sfp; 628 int error; 629 630 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 631 error = kern_fstatfs(td, uap->fd, sfp); 632 if (error == 0) { 633 freebsd4_cvtstatfs(sfp, &osb); 634 error = copyout(&osb, uap->buf, sizeof(osb)); 635 } 636 free(sfp, M_STATFS); 637 return (error); 638 } 639 640 /* 641 * Get statistics on all filesystems. 642 */ 643 #ifndef _SYS_SYSPROTO_H_ 644 struct freebsd4_getfsstat_args { 645 struct ostatfs *buf; 646 long bufsize; 647 int mode; 648 }; 649 #endif 650 int 651 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 652 { 653 struct statfs *buf, *sp; 654 struct ostatfs osb; 655 size_t count, size; 656 int error; 657 658 if (uap->bufsize < 0) 659 return (EINVAL); 660 count = uap->bufsize / sizeof(struct ostatfs); 661 if (count > SIZE_MAX / sizeof(struct statfs)) 662 return (EINVAL); 663 size = count * sizeof(struct statfs); 664 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 665 uap->mode); 666 if (error == 0) 667 td->td_retval[0] = count; 668 if (size != 0) { 669 sp = buf; 670 while (count != 0 && error == 0) { 671 freebsd4_cvtstatfs(sp, &osb); 672 error = copyout(&osb, uap->buf, sizeof(osb)); 673 sp++; 674 uap->buf++; 675 count--; 676 } 677 free(buf, M_STATFS); 678 } 679 return (error); 680 } 681 682 /* 683 * Implement fstatfs() for (NFS) file handles. 684 */ 685 #ifndef _SYS_SYSPROTO_H_ 686 struct freebsd4_fhstatfs_args { 687 struct fhandle *u_fhp; 688 struct ostatfs *buf; 689 }; 690 #endif 691 int 692 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 693 { 694 struct ostatfs osb; 695 struct statfs *sfp; 696 fhandle_t fh; 697 int error; 698 699 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 700 if (error != 0) 701 return (error); 702 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 703 error = kern_fhstatfs(td, fh, sfp); 704 if (error == 0) { 705 freebsd4_cvtstatfs(sfp, &osb); 706 error = copyout(&osb, uap->buf, sizeof(osb)); 707 } 708 free(sfp, M_STATFS); 709 return (error); 710 } 711 712 /* 713 * Convert a new format statfs structure to an old format statfs structure. 714 */ 715 static void 716 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 717 { 718 719 statfs_scale_blocks(nsp, LONG_MAX); 720 bzero(osp, sizeof(*osp)); 721 osp->f_bsize = nsp->f_bsize; 722 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 723 osp->f_blocks = nsp->f_blocks; 724 osp->f_bfree = nsp->f_bfree; 725 osp->f_bavail = nsp->f_bavail; 726 osp->f_files = MIN(nsp->f_files, LONG_MAX); 727 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 728 osp->f_owner = nsp->f_owner; 729 osp->f_type = nsp->f_type; 730 osp->f_flags = nsp->f_flags; 731 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 732 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 733 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 734 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 735 strlcpy(osp->f_fstypename, nsp->f_fstypename, 736 MIN(MFSNAMELEN, OMFSNAMELEN)); 737 strlcpy(osp->f_mntonname, nsp->f_mntonname, 738 MIN(MNAMELEN, OMNAMELEN)); 739 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 740 MIN(MNAMELEN, OMNAMELEN)); 741 osp->f_fsid = nsp->f_fsid; 742 } 743 #endif /* COMPAT_FREEBSD4 */ 744 745 #if defined(COMPAT_FREEBSD11) 746 /* 747 * Get old format filesystem statistics. 748 */ 749 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 750 751 int 752 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 753 { 754 struct freebsd11_statfs osb; 755 struct statfs *sfp; 756 int error; 757 758 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 759 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 760 if (error == 0) { 761 freebsd11_cvtstatfs(sfp, &osb); 762 error = copyout(&osb, uap->buf, sizeof(osb)); 763 } 764 free(sfp, M_STATFS); 765 return (error); 766 } 767 768 /* 769 * Get filesystem statistics. 770 */ 771 int 772 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 773 { 774 struct freebsd11_statfs osb; 775 struct statfs *sfp; 776 int error; 777 778 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 779 error = kern_fstatfs(td, uap->fd, sfp); 780 if (error == 0) { 781 freebsd11_cvtstatfs(sfp, &osb); 782 error = copyout(&osb, uap->buf, sizeof(osb)); 783 } 784 free(sfp, M_STATFS); 785 return (error); 786 } 787 788 /* 789 * Get statistics on all filesystems. 790 */ 791 int 792 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 793 { 794 struct freebsd11_statfs osb; 795 struct statfs *buf, *sp; 796 size_t count, size; 797 int error; 798 799 count = uap->bufsize / sizeof(struct ostatfs); 800 size = count * sizeof(struct statfs); 801 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 802 uap->mode); 803 if (error == 0) 804 td->td_retval[0] = count; 805 if (size > 0) { 806 sp = buf; 807 while (count > 0 && error == 0) { 808 freebsd11_cvtstatfs(sp, &osb); 809 error = copyout(&osb, uap->buf, sizeof(osb)); 810 sp++; 811 uap->buf++; 812 count--; 813 } 814 free(buf, M_STATFS); 815 } 816 return (error); 817 } 818 819 /* 820 * Implement fstatfs() for (NFS) file handles. 821 */ 822 int 823 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 824 { 825 struct freebsd11_statfs osb; 826 struct statfs *sfp; 827 fhandle_t fh; 828 int error; 829 830 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 831 if (error) 832 return (error); 833 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 834 error = kern_fhstatfs(td, fh, sfp); 835 if (error == 0) { 836 freebsd11_cvtstatfs(sfp, &osb); 837 error = copyout(&osb, uap->buf, sizeof(osb)); 838 } 839 free(sfp, M_STATFS); 840 return (error); 841 } 842 843 /* 844 * Convert a new format statfs structure to an old format statfs structure. 845 */ 846 static void 847 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 848 { 849 850 bzero(osp, sizeof(*osp)); 851 osp->f_version = FREEBSD11_STATFS_VERSION; 852 osp->f_type = nsp->f_type; 853 osp->f_flags = nsp->f_flags; 854 osp->f_bsize = nsp->f_bsize; 855 osp->f_iosize = nsp->f_iosize; 856 osp->f_blocks = nsp->f_blocks; 857 osp->f_bfree = nsp->f_bfree; 858 osp->f_bavail = nsp->f_bavail; 859 osp->f_files = nsp->f_files; 860 osp->f_ffree = nsp->f_ffree; 861 osp->f_syncwrites = nsp->f_syncwrites; 862 osp->f_asyncwrites = nsp->f_asyncwrites; 863 osp->f_syncreads = nsp->f_syncreads; 864 osp->f_asyncreads = nsp->f_asyncreads; 865 osp->f_namemax = nsp->f_namemax; 866 osp->f_owner = nsp->f_owner; 867 osp->f_fsid = nsp->f_fsid; 868 strlcpy(osp->f_fstypename, nsp->f_fstypename, 869 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 870 strlcpy(osp->f_mntonname, nsp->f_mntonname, 871 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 872 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 873 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 874 } 875 #endif /* COMPAT_FREEBSD11 */ 876 877 /* 878 * Change current working directory to a given file descriptor. 879 */ 880 #ifndef _SYS_SYSPROTO_H_ 881 struct fchdir_args { 882 int fd; 883 }; 884 #endif 885 int 886 sys_fchdir(struct thread *td, struct fchdir_args *uap) 887 { 888 struct vnode *vp, *tdp; 889 struct mount *mp; 890 struct file *fp; 891 int error; 892 893 AUDIT_ARG_FD(uap->fd); 894 error = getvnode_path(td, uap->fd, &cap_fchdir_rights, 895 &fp); 896 if (error != 0) 897 return (error); 898 vp = fp->f_vnode; 899 vref(vp); 900 fdrop(fp, td); 901 vn_lock(vp, LK_SHARED | LK_RETRY); 902 AUDIT_ARG_VNODE1(vp); 903 error = change_dir(vp, td); 904 while (!error && (mp = vp->v_mountedhere) != NULL) { 905 if (vfs_busy(mp, 0)) 906 continue; 907 error = VFS_ROOT(mp, LK_SHARED, &tdp); 908 vfs_unbusy(mp); 909 if (error != 0) 910 break; 911 vput(vp); 912 vp = tdp; 913 } 914 if (error != 0) { 915 vput(vp); 916 return (error); 917 } 918 VOP_UNLOCK(vp); 919 pwd_chdir(td, vp); 920 return (0); 921 } 922 923 /* 924 * Change current working directory (``.''). 925 */ 926 #ifndef _SYS_SYSPROTO_H_ 927 struct chdir_args { 928 char *path; 929 }; 930 #endif 931 int 932 sys_chdir(struct thread *td, struct chdir_args *uap) 933 { 934 935 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 936 } 937 938 int 939 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg) 940 { 941 struct nameidata nd; 942 int error; 943 944 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 945 pathseg, path, td); 946 if ((error = namei(&nd)) != 0) 947 return (error); 948 if ((error = change_dir(nd.ni_vp, td)) != 0) { 949 vput(nd.ni_vp); 950 NDFREE_NOTHING(&nd); 951 return (error); 952 } 953 VOP_UNLOCK(nd.ni_vp); 954 NDFREE_NOTHING(&nd); 955 pwd_chdir(td, nd.ni_vp); 956 return (0); 957 } 958 959 /* 960 * Change notion of root (``/'') directory. 961 */ 962 #ifndef _SYS_SYSPROTO_H_ 963 struct chroot_args { 964 char *path; 965 }; 966 #endif 967 int 968 sys_chroot(struct thread *td, struct chroot_args *uap) 969 { 970 struct nameidata nd; 971 int error; 972 973 error = priv_check(td, PRIV_VFS_CHROOT); 974 if (error != 0) 975 return (error); 976 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 977 UIO_USERSPACE, uap->path, td); 978 error = namei(&nd); 979 if (error != 0) 980 goto error; 981 error = change_dir(nd.ni_vp, td); 982 if (error != 0) 983 goto e_vunlock; 984 #ifdef MAC 985 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 986 if (error != 0) 987 goto e_vunlock; 988 #endif 989 VOP_UNLOCK(nd.ni_vp); 990 error = pwd_chroot(td, nd.ni_vp); 991 vrele(nd.ni_vp); 992 NDFREE_NOTHING(&nd); 993 return (error); 994 e_vunlock: 995 vput(nd.ni_vp); 996 error: 997 NDFREE_NOTHING(&nd); 998 return (error); 999 } 1000 1001 /* 1002 * Common routine for chroot and chdir. Callers must provide a locked vnode 1003 * instance. 1004 */ 1005 int 1006 change_dir(struct vnode *vp, struct thread *td) 1007 { 1008 #ifdef MAC 1009 int error; 1010 #endif 1011 1012 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 1013 if (vp->v_type != VDIR) 1014 return (ENOTDIR); 1015 #ifdef MAC 1016 error = mac_vnode_check_chdir(td->td_ucred, vp); 1017 if (error != 0) 1018 return (error); 1019 #endif 1020 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 1021 } 1022 1023 static __inline void 1024 flags_to_rights(int flags, cap_rights_t *rightsp) 1025 { 1026 if (flags & O_EXEC) { 1027 cap_rights_set_one(rightsp, CAP_FEXECVE); 1028 if (flags & O_PATH) 1029 return; 1030 } else { 1031 switch ((flags & O_ACCMODE)) { 1032 case O_RDONLY: 1033 cap_rights_set_one(rightsp, CAP_READ); 1034 break; 1035 case O_RDWR: 1036 cap_rights_set_one(rightsp, CAP_READ); 1037 /* FALLTHROUGH */ 1038 case O_WRONLY: 1039 cap_rights_set_one(rightsp, CAP_WRITE); 1040 if (!(flags & (O_APPEND | O_TRUNC))) 1041 cap_rights_set_one(rightsp, CAP_SEEK); 1042 break; 1043 } 1044 } 1045 1046 if (flags & O_CREAT) 1047 cap_rights_set_one(rightsp, CAP_CREATE); 1048 1049 if (flags & O_TRUNC) 1050 cap_rights_set_one(rightsp, CAP_FTRUNCATE); 1051 1052 if (flags & (O_SYNC | O_FSYNC)) 1053 cap_rights_set_one(rightsp, CAP_FSYNC); 1054 1055 if (flags & (O_EXLOCK | O_SHLOCK)) 1056 cap_rights_set_one(rightsp, CAP_FLOCK); 1057 } 1058 1059 /* 1060 * Check permissions, allocate an open file structure, and call the device 1061 * open routine if any. 1062 */ 1063 #ifndef _SYS_SYSPROTO_H_ 1064 struct open_args { 1065 char *path; 1066 int flags; 1067 int mode; 1068 }; 1069 #endif 1070 int 1071 sys_open(struct thread *td, struct open_args *uap) 1072 { 1073 1074 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1075 uap->flags, uap->mode)); 1076 } 1077 1078 #ifndef _SYS_SYSPROTO_H_ 1079 struct openat_args { 1080 int fd; 1081 char *path; 1082 int flag; 1083 int mode; 1084 }; 1085 #endif 1086 int 1087 sys_openat(struct thread *td, struct openat_args *uap) 1088 { 1089 1090 AUDIT_ARG_FD(uap->fd); 1091 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1092 uap->mode)); 1093 } 1094 1095 int 1096 kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1097 int flags, int mode) 1098 { 1099 struct proc *p = td->td_proc; 1100 struct filedesc *fdp; 1101 struct pwddesc *pdp; 1102 struct file *fp; 1103 struct vnode *vp; 1104 struct nameidata nd; 1105 cap_rights_t rights; 1106 int cmode, error, indx; 1107 1108 indx = -1; 1109 fdp = p->p_fd; 1110 pdp = p->p_pd; 1111 1112 AUDIT_ARG_FFLAGS(flags); 1113 AUDIT_ARG_MODE(mode); 1114 cap_rights_init_one(&rights, CAP_LOOKUP); 1115 flags_to_rights(flags, &rights); 1116 1117 /* 1118 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1119 * may be specified. On the other hand, for O_PATH any mode 1120 * except O_EXEC is ignored. 1121 */ 1122 if ((flags & O_PATH) != 0) { 1123 flags &= ~(O_CREAT | O_ACCMODE); 1124 } else if ((flags & O_EXEC) != 0) { 1125 if (flags & O_ACCMODE) 1126 return (EINVAL); 1127 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1128 return (EINVAL); 1129 } else { 1130 flags = FFLAGS(flags); 1131 } 1132 1133 /* 1134 * Allocate a file structure. The descriptor to reference it 1135 * is allocated and used by finstall_refed() below. 1136 */ 1137 error = falloc_noinstall(td, &fp); 1138 if (error != 0) 1139 return (error); 1140 /* Set the flags early so the finit in devfs can pick them up. */ 1141 fp->f_flag = flags & FMASK; 1142 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT; 1143 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1144 &rights, td); 1145 td->td_dupfd = -1; /* XXX check for fdopen */ 1146 error = vn_open(&nd, &flags, cmode, fp); 1147 if (error != 0) { 1148 /* 1149 * If the vn_open replaced the method vector, something 1150 * wonderous happened deep below and we just pass it up 1151 * pretending we know what we do. 1152 */ 1153 if (error == ENXIO && fp->f_ops != &badfileops) { 1154 MPASS((flags & O_PATH) == 0); 1155 goto success; 1156 } 1157 1158 /* 1159 * Handle special fdopen() case. bleh. 1160 * 1161 * Don't do this for relative (capability) lookups; we don't 1162 * understand exactly what would happen, and we don't think 1163 * that it ever should. 1164 */ 1165 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 && 1166 (error == ENODEV || error == ENXIO) && 1167 td->td_dupfd >= 0) { 1168 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1169 &indx); 1170 if (error == 0) 1171 goto success; 1172 } 1173 1174 goto bad; 1175 } 1176 td->td_dupfd = 0; 1177 NDFREE(&nd, NDF_ONLY_PNBUF); 1178 vp = nd.ni_vp; 1179 1180 /* 1181 * Store the vnode, for any f_type. Typically, the vnode use 1182 * count is decremented by direct call to vn_closefile() for 1183 * files that switched type in the cdevsw fdopen() method. 1184 */ 1185 fp->f_vnode = vp; 1186 1187 /* 1188 * If the file wasn't claimed by devfs bind it to the normal 1189 * vnode operations here. 1190 */ 1191 if (fp->f_ops == &badfileops) { 1192 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0, 1193 ("Unexpected fifo fp %p vp %p", fp, vp)); 1194 if ((flags & O_PATH) != 0) { 1195 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED), 1196 DTYPE_VNODE, NULL, &path_fileops); 1197 vhold(vp); 1198 vunref(vp); 1199 } else { 1200 finit_vnode(fp, flags, NULL, &vnops); 1201 } 1202 } 1203 1204 VOP_UNLOCK(vp); 1205 if (flags & O_TRUNC) { 1206 error = fo_truncate(fp, 0, td->td_ucred, td); 1207 if (error != 0) 1208 goto bad; 1209 } 1210 success: 1211 /* 1212 * If we haven't already installed the FD (for dupfdopen), do so now. 1213 */ 1214 if (indx == -1) { 1215 struct filecaps *fcaps; 1216 1217 #ifdef CAPABILITIES 1218 if ((nd.ni_resflags & NIRES_STRICTREL) != 0) 1219 fcaps = &nd.ni_filecaps; 1220 else 1221 #endif 1222 fcaps = NULL; 1223 error = finstall_refed(td, fp, &indx, flags, fcaps); 1224 /* On success finstall_refed() consumes fcaps. */ 1225 if (error != 0) { 1226 filecaps_free(&nd.ni_filecaps); 1227 goto bad; 1228 } 1229 } else { 1230 filecaps_free(&nd.ni_filecaps); 1231 falloc_abort(td, fp); 1232 } 1233 1234 td->td_retval[0] = indx; 1235 return (0); 1236 bad: 1237 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1238 falloc_abort(td, fp); 1239 return (error); 1240 } 1241 1242 #ifdef COMPAT_43 1243 /* 1244 * Create a file. 1245 */ 1246 #ifndef _SYS_SYSPROTO_H_ 1247 struct ocreat_args { 1248 char *path; 1249 int mode; 1250 }; 1251 #endif 1252 int 1253 ocreat(struct thread *td, struct ocreat_args *uap) 1254 { 1255 1256 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1257 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1258 } 1259 #endif /* COMPAT_43 */ 1260 1261 /* 1262 * Create a special file. 1263 */ 1264 #ifndef _SYS_SYSPROTO_H_ 1265 struct mknodat_args { 1266 int fd; 1267 char *path; 1268 mode_t mode; 1269 dev_t dev; 1270 }; 1271 #endif 1272 int 1273 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1274 { 1275 1276 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1277 uap->dev)); 1278 } 1279 1280 #if defined(COMPAT_FREEBSD11) 1281 int 1282 freebsd11_mknod(struct thread *td, 1283 struct freebsd11_mknod_args *uap) 1284 { 1285 1286 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1287 uap->mode, uap->dev)); 1288 } 1289 1290 int 1291 freebsd11_mknodat(struct thread *td, 1292 struct freebsd11_mknodat_args *uap) 1293 { 1294 1295 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1296 uap->dev)); 1297 } 1298 #endif /* COMPAT_FREEBSD11 */ 1299 1300 int 1301 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1302 int mode, dev_t dev) 1303 { 1304 struct vnode *vp; 1305 struct mount *mp; 1306 struct vattr vattr; 1307 struct nameidata nd; 1308 int error, whiteout = 0; 1309 1310 AUDIT_ARG_MODE(mode); 1311 AUDIT_ARG_DEV(dev); 1312 switch (mode & S_IFMT) { 1313 case S_IFCHR: 1314 case S_IFBLK: 1315 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1316 if (error == 0 && dev == VNOVAL) 1317 error = EINVAL; 1318 break; 1319 case S_IFWHT: 1320 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1321 break; 1322 case S_IFIFO: 1323 if (dev == 0) 1324 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1325 /* FALLTHROUGH */ 1326 default: 1327 error = EINVAL; 1328 break; 1329 } 1330 if (error != 0) 1331 return (error); 1332 NDPREINIT(&nd); 1333 restart: 1334 bwillwrite(); 1335 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1336 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1337 td); 1338 if ((error = namei(&nd)) != 0) 1339 return (error); 1340 vp = nd.ni_vp; 1341 if (vp != NULL) { 1342 NDFREE(&nd, NDF_ONLY_PNBUF); 1343 if (vp == nd.ni_dvp) 1344 vrele(nd.ni_dvp); 1345 else 1346 vput(nd.ni_dvp); 1347 vrele(vp); 1348 return (EEXIST); 1349 } else { 1350 VATTR_NULL(&vattr); 1351 vattr.va_mode = (mode & ALLPERMS) & 1352 ~td->td_proc->p_pd->pd_cmask; 1353 vattr.va_rdev = dev; 1354 whiteout = 0; 1355 1356 switch (mode & S_IFMT) { 1357 case S_IFCHR: 1358 vattr.va_type = VCHR; 1359 break; 1360 case S_IFBLK: 1361 vattr.va_type = VBLK; 1362 break; 1363 case S_IFWHT: 1364 whiteout = 1; 1365 break; 1366 default: 1367 panic("kern_mknod: invalid mode"); 1368 } 1369 } 1370 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1371 NDFREE(&nd, NDF_ONLY_PNBUF); 1372 vput(nd.ni_dvp); 1373 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1374 return (error); 1375 goto restart; 1376 } 1377 #ifdef MAC 1378 if (error == 0 && !whiteout) 1379 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1380 &nd.ni_cnd, &vattr); 1381 #endif 1382 if (error == 0) { 1383 if (whiteout) 1384 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1385 else { 1386 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1387 &nd.ni_cnd, &vattr); 1388 } 1389 } 1390 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL, 1391 true); 1392 vn_finished_write(mp); 1393 NDFREE(&nd, NDF_ONLY_PNBUF); 1394 if (error == ERELOOKUP) 1395 goto restart; 1396 return (error); 1397 } 1398 1399 /* 1400 * Create a named pipe. 1401 */ 1402 #ifndef _SYS_SYSPROTO_H_ 1403 struct mkfifo_args { 1404 char *path; 1405 int mode; 1406 }; 1407 #endif 1408 int 1409 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1410 { 1411 1412 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1413 uap->mode)); 1414 } 1415 1416 #ifndef _SYS_SYSPROTO_H_ 1417 struct mkfifoat_args { 1418 int fd; 1419 char *path; 1420 mode_t mode; 1421 }; 1422 #endif 1423 int 1424 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1425 { 1426 1427 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1428 uap->mode)); 1429 } 1430 1431 int 1432 kern_mkfifoat(struct thread *td, int fd, const char *path, 1433 enum uio_seg pathseg, int mode) 1434 { 1435 struct mount *mp; 1436 struct vattr vattr; 1437 struct nameidata nd; 1438 int error; 1439 1440 AUDIT_ARG_MODE(mode); 1441 NDPREINIT(&nd); 1442 restart: 1443 bwillwrite(); 1444 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1445 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1446 td); 1447 if ((error = namei(&nd)) != 0) 1448 return (error); 1449 if (nd.ni_vp != NULL) { 1450 NDFREE(&nd, NDF_ONLY_PNBUF); 1451 if (nd.ni_vp == nd.ni_dvp) 1452 vrele(nd.ni_dvp); 1453 else 1454 vput(nd.ni_dvp); 1455 vrele(nd.ni_vp); 1456 return (EEXIST); 1457 } 1458 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1459 NDFREE(&nd, NDF_ONLY_PNBUF); 1460 vput(nd.ni_dvp); 1461 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1462 return (error); 1463 goto restart; 1464 } 1465 VATTR_NULL(&vattr); 1466 vattr.va_type = VFIFO; 1467 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask; 1468 #ifdef MAC 1469 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1470 &vattr); 1471 if (error != 0) 1472 goto out; 1473 #endif 1474 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1475 #ifdef MAC 1476 out: 1477 #endif 1478 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1479 vn_finished_write(mp); 1480 NDFREE(&nd, NDF_ONLY_PNBUF); 1481 if (error == ERELOOKUP) 1482 goto restart; 1483 return (error); 1484 } 1485 1486 /* 1487 * Make a hard file link. 1488 */ 1489 #ifndef _SYS_SYSPROTO_H_ 1490 struct link_args { 1491 char *path; 1492 char *link; 1493 }; 1494 #endif 1495 int 1496 sys_link(struct thread *td, struct link_args *uap) 1497 { 1498 1499 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1500 UIO_USERSPACE, FOLLOW)); 1501 } 1502 1503 #ifndef _SYS_SYSPROTO_H_ 1504 struct linkat_args { 1505 int fd1; 1506 char *path1; 1507 int fd2; 1508 char *path2; 1509 int flag; 1510 }; 1511 #endif 1512 int 1513 sys_linkat(struct thread *td, struct linkat_args *uap) 1514 { 1515 int flag; 1516 1517 flag = uap->flag; 1518 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | 1519 AT_EMPTY_PATH)) != 0) 1520 return (EINVAL); 1521 1522 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1523 UIO_USERSPACE, at2cnpflags(flag, AT_SYMLINK_FOLLOW | 1524 AT_RESOLVE_BENEATH | AT_EMPTY_PATH))); 1525 } 1526 1527 int hardlink_check_uid = 0; 1528 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1529 &hardlink_check_uid, 0, 1530 "Unprivileged processes cannot create hard links to files owned by other " 1531 "users"); 1532 static int hardlink_check_gid = 0; 1533 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1534 &hardlink_check_gid, 0, 1535 "Unprivileged processes cannot create hard links to files owned by other " 1536 "groups"); 1537 1538 static int 1539 can_hardlink(struct vnode *vp, struct ucred *cred) 1540 { 1541 struct vattr va; 1542 int error; 1543 1544 if (!hardlink_check_uid && !hardlink_check_gid) 1545 return (0); 1546 1547 error = VOP_GETATTR(vp, &va, cred); 1548 if (error != 0) 1549 return (error); 1550 1551 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1552 error = priv_check_cred(cred, PRIV_VFS_LINK); 1553 if (error != 0) 1554 return (error); 1555 } 1556 1557 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1558 error = priv_check_cred(cred, PRIV_VFS_LINK); 1559 if (error != 0) 1560 return (error); 1561 } 1562 1563 return (0); 1564 } 1565 1566 int 1567 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1568 const char *path2, enum uio_seg segflag, int follow) 1569 { 1570 struct nameidata nd; 1571 int error; 1572 1573 NDPREINIT(&nd); 1574 do { 1575 bwillwrite(); 1576 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag, 1577 path1, fd1, &cap_linkat_source_rights, td); 1578 if ((error = namei(&nd)) != 0) 1579 return (error); 1580 NDFREE(&nd, NDF_ONLY_PNBUF); 1581 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) { 1582 error = priv_check(td, PRIV_VFS_FHOPEN); 1583 if (error != 0) { 1584 vrele(nd.ni_vp); 1585 return (error); 1586 } 1587 } 1588 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1589 } while (error == EAGAIN || error == ERELOOKUP); 1590 return (error); 1591 } 1592 1593 static int 1594 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1595 enum uio_seg segflag) 1596 { 1597 struct nameidata nd; 1598 struct mount *mp; 1599 int error; 1600 1601 if (vp->v_type == VDIR) { 1602 vrele(vp); 1603 return (EPERM); /* POSIX */ 1604 } 1605 NDINIT_ATRIGHTS(&nd, CREATE, 1606 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1607 &cap_linkat_target_rights, td); 1608 if ((error = namei(&nd)) == 0) { 1609 if (nd.ni_vp != NULL) { 1610 NDFREE(&nd, NDF_ONLY_PNBUF); 1611 if (nd.ni_dvp == nd.ni_vp) 1612 vrele(nd.ni_dvp); 1613 else 1614 vput(nd.ni_dvp); 1615 vrele(nd.ni_vp); 1616 vrele(vp); 1617 return (EEXIST); 1618 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1619 /* 1620 * Cross-device link. No need to recheck 1621 * vp->v_type, since it cannot change, except 1622 * to VBAD. 1623 */ 1624 NDFREE(&nd, NDF_ONLY_PNBUF); 1625 vput(nd.ni_dvp); 1626 vrele(vp); 1627 return (EXDEV); 1628 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1629 error = can_hardlink(vp, td->td_ucred); 1630 #ifdef MAC 1631 if (error == 0) 1632 error = mac_vnode_check_link(td->td_ucred, 1633 nd.ni_dvp, vp, &nd.ni_cnd); 1634 #endif 1635 if (error != 0) { 1636 vput(vp); 1637 vput(nd.ni_dvp); 1638 NDFREE(&nd, NDF_ONLY_PNBUF); 1639 return (error); 1640 } 1641 error = vn_start_write(vp, &mp, V_NOWAIT); 1642 if (error != 0) { 1643 vput(vp); 1644 vput(nd.ni_dvp); 1645 NDFREE(&nd, NDF_ONLY_PNBUF); 1646 error = vn_start_write(NULL, &mp, 1647 V_XSLEEP | PCATCH); 1648 if (error != 0) 1649 return (error); 1650 return (EAGAIN); 1651 } 1652 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1653 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true); 1654 vn_finished_write(mp); 1655 NDFREE(&nd, NDF_ONLY_PNBUF); 1656 vp = NULL; 1657 } else { 1658 vput(nd.ni_dvp); 1659 NDFREE(&nd, NDF_ONLY_PNBUF); 1660 vrele(vp); 1661 return (EAGAIN); 1662 } 1663 } 1664 if (vp != NULL) 1665 vrele(vp); 1666 return (error); 1667 } 1668 1669 /* 1670 * Make a symbolic link. 1671 */ 1672 #ifndef _SYS_SYSPROTO_H_ 1673 struct symlink_args { 1674 char *path; 1675 char *link; 1676 }; 1677 #endif 1678 int 1679 sys_symlink(struct thread *td, struct symlink_args *uap) 1680 { 1681 1682 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1683 UIO_USERSPACE)); 1684 } 1685 1686 #ifndef _SYS_SYSPROTO_H_ 1687 struct symlinkat_args { 1688 char *path; 1689 int fd; 1690 char *path2; 1691 }; 1692 #endif 1693 int 1694 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1695 { 1696 1697 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1698 UIO_USERSPACE)); 1699 } 1700 1701 int 1702 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1703 enum uio_seg segflg) 1704 { 1705 struct mount *mp; 1706 struct vattr vattr; 1707 const char *syspath; 1708 char *tmppath; 1709 struct nameidata nd; 1710 int error; 1711 1712 if (segflg == UIO_SYSSPACE) { 1713 syspath = path1; 1714 } else { 1715 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1716 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1717 goto out; 1718 syspath = tmppath; 1719 } 1720 AUDIT_ARG_TEXT(syspath); 1721 NDPREINIT(&nd); 1722 restart: 1723 bwillwrite(); 1724 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1725 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1726 td); 1727 if ((error = namei(&nd)) != 0) 1728 goto out; 1729 if (nd.ni_vp) { 1730 NDFREE(&nd, NDF_ONLY_PNBUF); 1731 if (nd.ni_vp == nd.ni_dvp) 1732 vrele(nd.ni_dvp); 1733 else 1734 vput(nd.ni_dvp); 1735 vrele(nd.ni_vp); 1736 nd.ni_vp = NULL; 1737 error = EEXIST; 1738 goto out; 1739 } 1740 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1741 NDFREE(&nd, NDF_ONLY_PNBUF); 1742 vput(nd.ni_dvp); 1743 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1744 goto out; 1745 goto restart; 1746 } 1747 VATTR_NULL(&vattr); 1748 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask; 1749 #ifdef MAC 1750 vattr.va_type = VLNK; 1751 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1752 &vattr); 1753 if (error != 0) 1754 goto out2; 1755 #endif 1756 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1757 #ifdef MAC 1758 out2: 1759 #endif 1760 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 1761 vn_finished_write(mp); 1762 NDFREE(&nd, NDF_ONLY_PNBUF); 1763 if (error == ERELOOKUP) 1764 goto restart; 1765 out: 1766 if (segflg != UIO_SYSSPACE) 1767 uma_zfree(namei_zone, tmppath); 1768 return (error); 1769 } 1770 1771 /* 1772 * Delete a whiteout from the filesystem. 1773 */ 1774 #ifndef _SYS_SYSPROTO_H_ 1775 struct undelete_args { 1776 char *path; 1777 }; 1778 #endif 1779 int 1780 sys_undelete(struct thread *td, struct undelete_args *uap) 1781 { 1782 struct mount *mp; 1783 struct nameidata nd; 1784 int error; 1785 1786 NDPREINIT(&nd); 1787 restart: 1788 bwillwrite(); 1789 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1790 UIO_USERSPACE, uap->path, td); 1791 error = namei(&nd); 1792 if (error != 0) 1793 return (error); 1794 1795 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1796 NDFREE(&nd, NDF_ONLY_PNBUF); 1797 if (nd.ni_vp == nd.ni_dvp) 1798 vrele(nd.ni_dvp); 1799 else 1800 vput(nd.ni_dvp); 1801 if (nd.ni_vp) 1802 vrele(nd.ni_vp); 1803 return (EEXIST); 1804 } 1805 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1806 NDFREE(&nd, NDF_ONLY_PNBUF); 1807 vput(nd.ni_dvp); 1808 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1809 return (error); 1810 goto restart; 1811 } 1812 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1813 NDFREE(&nd, NDF_ONLY_PNBUF); 1814 vput(nd.ni_dvp); 1815 vn_finished_write(mp); 1816 if (error == ERELOOKUP) 1817 goto restart; 1818 return (error); 1819 } 1820 1821 /* 1822 * Delete a name from the filesystem. 1823 */ 1824 #ifndef _SYS_SYSPROTO_H_ 1825 struct unlink_args { 1826 char *path; 1827 }; 1828 #endif 1829 int 1830 sys_unlink(struct thread *td, struct unlink_args *uap) 1831 { 1832 1833 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1834 0, 0)); 1835 } 1836 1837 static int 1838 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1839 int flag, enum uio_seg pathseg, ino_t oldinum) 1840 { 1841 1842 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0) 1843 return (EINVAL); 1844 1845 if ((flag & AT_REMOVEDIR) != 0) 1846 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1847 1848 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1849 } 1850 1851 #ifndef _SYS_SYSPROTO_H_ 1852 struct unlinkat_args { 1853 int fd; 1854 char *path; 1855 int flag; 1856 }; 1857 #endif 1858 int 1859 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1860 { 1861 1862 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1863 UIO_USERSPACE, 0)); 1864 } 1865 1866 #ifndef _SYS_SYSPROTO_H_ 1867 struct funlinkat_args { 1868 int dfd; 1869 const char *path; 1870 int fd; 1871 int flag; 1872 }; 1873 #endif 1874 int 1875 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 1876 { 1877 1878 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 1879 UIO_USERSPACE, 0)); 1880 } 1881 1882 int 1883 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 1884 enum uio_seg pathseg, int flag, ino_t oldinum) 1885 { 1886 struct mount *mp; 1887 struct file *fp; 1888 struct vnode *vp; 1889 struct nameidata nd; 1890 struct stat sb; 1891 int error; 1892 1893 fp = NULL; 1894 if (fd != FD_NONE) { 1895 error = getvnode_path(td, fd, &cap_no_rights, &fp); 1896 if (error != 0) 1897 return (error); 1898 } 1899 1900 NDPREINIT(&nd); 1901 restart: 1902 bwillwrite(); 1903 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1904 at2cnpflags(flag, AT_RESOLVE_BENEATH), 1905 pathseg, path, dfd, &cap_unlinkat_rights, td); 1906 if ((error = namei(&nd)) != 0) { 1907 if (error == EINVAL) 1908 error = EPERM; 1909 goto fdout; 1910 } 1911 vp = nd.ni_vp; 1912 if (vp->v_type == VDIR && oldinum == 0) { 1913 error = EPERM; /* POSIX */ 1914 } else if (oldinum != 0 && 1915 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1916 sb.st_ino != oldinum) { 1917 error = EIDRM; /* Identifier removed */ 1918 } else if (fp != NULL && fp->f_vnode != vp) { 1919 if (VN_IS_DOOMED(fp->f_vnode)) 1920 error = EBADF; 1921 else 1922 error = EDEADLK; 1923 } else { 1924 /* 1925 * The root of a mounted filesystem cannot be deleted. 1926 * 1927 * XXX: can this only be a VDIR case? 1928 */ 1929 if (vp->v_vflag & VV_ROOT) 1930 error = EBUSY; 1931 } 1932 if (error == 0) { 1933 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1934 NDFREE(&nd, NDF_ONLY_PNBUF); 1935 vput(nd.ni_dvp); 1936 if (vp == nd.ni_dvp) 1937 vrele(vp); 1938 else 1939 vput(vp); 1940 if ((error = vn_start_write(NULL, &mp, 1941 V_XSLEEP | PCATCH)) != 0) { 1942 goto fdout; 1943 } 1944 goto restart; 1945 } 1946 #ifdef MAC 1947 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1948 &nd.ni_cnd); 1949 if (error != 0) 1950 goto out; 1951 #endif 1952 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1953 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1954 #ifdef MAC 1955 out: 1956 #endif 1957 vn_finished_write(mp); 1958 } 1959 NDFREE(&nd, NDF_ONLY_PNBUF); 1960 vput(nd.ni_dvp); 1961 if (vp == nd.ni_dvp) 1962 vrele(vp); 1963 else 1964 vput(vp); 1965 if (error == ERELOOKUP) 1966 goto restart; 1967 fdout: 1968 if (fp != NULL) 1969 fdrop(fp, td); 1970 return (error); 1971 } 1972 1973 /* 1974 * Reposition read/write file offset. 1975 */ 1976 #ifndef _SYS_SYSPROTO_H_ 1977 struct lseek_args { 1978 int fd; 1979 int pad; 1980 off_t offset; 1981 int whence; 1982 }; 1983 #endif 1984 int 1985 sys_lseek(struct thread *td, struct lseek_args *uap) 1986 { 1987 1988 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1989 } 1990 1991 int 1992 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1993 { 1994 struct file *fp; 1995 int error; 1996 1997 AUDIT_ARG_FD(fd); 1998 error = fget(td, fd, &cap_seek_rights, &fp); 1999 if (error != 0) 2000 return (error); 2001 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 2002 fo_seek(fp, offset, whence, td) : ESPIPE; 2003 fdrop(fp, td); 2004 return (error); 2005 } 2006 2007 #if defined(COMPAT_43) 2008 /* 2009 * Reposition read/write file offset. 2010 */ 2011 #ifndef _SYS_SYSPROTO_H_ 2012 struct olseek_args { 2013 int fd; 2014 long offset; 2015 int whence; 2016 }; 2017 #endif 2018 int 2019 olseek(struct thread *td, struct olseek_args *uap) 2020 { 2021 2022 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2023 } 2024 #endif /* COMPAT_43 */ 2025 2026 #if defined(COMPAT_FREEBSD6) 2027 /* Version with the 'pad' argument */ 2028 int 2029 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 2030 { 2031 2032 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 2033 } 2034 #endif 2035 2036 /* 2037 * Check access permissions using passed credentials. 2038 */ 2039 static int 2040 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 2041 struct thread *td) 2042 { 2043 accmode_t accmode; 2044 int error; 2045 2046 /* Flags == 0 means only check for existence. */ 2047 if (user_flags == 0) 2048 return (0); 2049 2050 accmode = 0; 2051 if (user_flags & R_OK) 2052 accmode |= VREAD; 2053 if (user_flags & W_OK) 2054 accmode |= VWRITE; 2055 if (user_flags & X_OK) 2056 accmode |= VEXEC; 2057 #ifdef MAC 2058 error = mac_vnode_check_access(cred, vp, accmode); 2059 if (error != 0) 2060 return (error); 2061 #endif 2062 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 2063 error = VOP_ACCESS(vp, accmode, cred, td); 2064 return (error); 2065 } 2066 2067 /* 2068 * Check access permissions using "real" credentials. 2069 */ 2070 #ifndef _SYS_SYSPROTO_H_ 2071 struct access_args { 2072 char *path; 2073 int amode; 2074 }; 2075 #endif 2076 int 2077 sys_access(struct thread *td, struct access_args *uap) 2078 { 2079 2080 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2081 0, uap->amode)); 2082 } 2083 2084 #ifndef _SYS_SYSPROTO_H_ 2085 struct faccessat_args { 2086 int dirfd; 2087 char *path; 2088 int amode; 2089 int flag; 2090 } 2091 #endif 2092 int 2093 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2094 { 2095 2096 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2097 uap->amode)); 2098 } 2099 2100 int 2101 kern_accessat(struct thread *td, int fd, const char *path, 2102 enum uio_seg pathseg, int flag, int amode) 2103 { 2104 struct ucred *cred, *usecred; 2105 struct vnode *vp; 2106 struct nameidata nd; 2107 int error; 2108 2109 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH)) != 0) 2110 return (EINVAL); 2111 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2112 return (EINVAL); 2113 2114 /* 2115 * Create and modify a temporary credential instead of one that 2116 * is potentially shared (if we need one). 2117 */ 2118 cred = td->td_ucred; 2119 if ((flag & AT_EACCESS) == 0 && 2120 ((cred->cr_uid != cred->cr_ruid || 2121 cred->cr_rgid != cred->cr_groups[0]))) { 2122 usecred = crdup(cred); 2123 usecred->cr_uid = cred->cr_ruid; 2124 usecred->cr_groups[0] = cred->cr_rgid; 2125 td->td_ucred = usecred; 2126 } else 2127 usecred = cred; 2128 AUDIT_ARG_VALUE(amode); 2129 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2130 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | 2131 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights, td); 2132 if ((error = namei(&nd)) != 0) 2133 goto out; 2134 vp = nd.ni_vp; 2135 2136 error = vn_access(vp, amode, usecred, td); 2137 NDFREE_NOTHING(&nd); 2138 vput(vp); 2139 out: 2140 if (usecred != cred) { 2141 td->td_ucred = cred; 2142 crfree(usecred); 2143 } 2144 return (error); 2145 } 2146 2147 /* 2148 * Check access permissions using "effective" credentials. 2149 */ 2150 #ifndef _SYS_SYSPROTO_H_ 2151 struct eaccess_args { 2152 char *path; 2153 int amode; 2154 }; 2155 #endif 2156 int 2157 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2158 { 2159 2160 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2161 AT_EACCESS, uap->amode)); 2162 } 2163 2164 #if defined(COMPAT_43) 2165 /* 2166 * Get file status; this version follows links. 2167 */ 2168 #ifndef _SYS_SYSPROTO_H_ 2169 struct ostat_args { 2170 char *path; 2171 struct ostat *ub; 2172 }; 2173 #endif 2174 int 2175 ostat(struct thread *td, struct ostat_args *uap) 2176 { 2177 struct stat sb; 2178 struct ostat osb; 2179 int error; 2180 2181 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2182 &sb, NULL); 2183 if (error != 0) 2184 return (error); 2185 cvtstat(&sb, &osb); 2186 return (copyout(&osb, uap->ub, sizeof (osb))); 2187 } 2188 2189 /* 2190 * Get file status; this version does not follow links. 2191 */ 2192 #ifndef _SYS_SYSPROTO_H_ 2193 struct olstat_args { 2194 char *path; 2195 struct ostat *ub; 2196 }; 2197 #endif 2198 int 2199 olstat(struct thread *td, struct olstat_args *uap) 2200 { 2201 struct stat sb; 2202 struct ostat osb; 2203 int error; 2204 2205 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2206 UIO_USERSPACE, &sb, NULL); 2207 if (error != 0) 2208 return (error); 2209 cvtstat(&sb, &osb); 2210 return (copyout(&osb, uap->ub, sizeof (osb))); 2211 } 2212 2213 /* 2214 * Convert from an old to a new stat structure. 2215 * XXX: many values are blindly truncated. 2216 */ 2217 void 2218 cvtstat(struct stat *st, struct ostat *ost) 2219 { 2220 2221 bzero(ost, sizeof(*ost)); 2222 ost->st_dev = st->st_dev; 2223 ost->st_ino = st->st_ino; 2224 ost->st_mode = st->st_mode; 2225 ost->st_nlink = st->st_nlink; 2226 ost->st_uid = st->st_uid; 2227 ost->st_gid = st->st_gid; 2228 ost->st_rdev = st->st_rdev; 2229 ost->st_size = MIN(st->st_size, INT32_MAX); 2230 ost->st_atim = st->st_atim; 2231 ost->st_mtim = st->st_mtim; 2232 ost->st_ctim = st->st_ctim; 2233 ost->st_blksize = st->st_blksize; 2234 ost->st_blocks = st->st_blocks; 2235 ost->st_flags = st->st_flags; 2236 ost->st_gen = st->st_gen; 2237 } 2238 #endif /* COMPAT_43 */ 2239 2240 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2241 int ino64_trunc_error; 2242 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2243 &ino64_trunc_error, 0, 2244 "Error on truncation of device, file or inode number, or link count"); 2245 2246 int 2247 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2248 { 2249 2250 ost->st_dev = st->st_dev; 2251 if (ost->st_dev != st->st_dev) { 2252 switch (ino64_trunc_error) { 2253 default: 2254 /* 2255 * Since dev_t is almost raw, don't clamp to the 2256 * maximum for case 2, but ignore the error. 2257 */ 2258 break; 2259 case 1: 2260 return (EOVERFLOW); 2261 } 2262 } 2263 ost->st_ino = st->st_ino; 2264 if (ost->st_ino != st->st_ino) { 2265 switch (ino64_trunc_error) { 2266 default: 2267 case 0: 2268 break; 2269 case 1: 2270 return (EOVERFLOW); 2271 case 2: 2272 ost->st_ino = UINT32_MAX; 2273 break; 2274 } 2275 } 2276 ost->st_mode = st->st_mode; 2277 ost->st_nlink = st->st_nlink; 2278 if (ost->st_nlink != st->st_nlink) { 2279 switch (ino64_trunc_error) { 2280 default: 2281 case 0: 2282 break; 2283 case 1: 2284 return (EOVERFLOW); 2285 case 2: 2286 ost->st_nlink = UINT16_MAX; 2287 break; 2288 } 2289 } 2290 ost->st_uid = st->st_uid; 2291 ost->st_gid = st->st_gid; 2292 ost->st_rdev = st->st_rdev; 2293 if (ost->st_rdev != st->st_rdev) { 2294 switch (ino64_trunc_error) { 2295 default: 2296 break; 2297 case 1: 2298 return (EOVERFLOW); 2299 } 2300 } 2301 ost->st_atim = st->st_atim; 2302 ost->st_mtim = st->st_mtim; 2303 ost->st_ctim = st->st_ctim; 2304 ost->st_size = st->st_size; 2305 ost->st_blocks = st->st_blocks; 2306 ost->st_blksize = st->st_blksize; 2307 ost->st_flags = st->st_flags; 2308 ost->st_gen = st->st_gen; 2309 ost->st_lspare = 0; 2310 ost->st_birthtim = st->st_birthtim; 2311 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2312 sizeof(*ost) - offsetof(struct freebsd11_stat, 2313 st_birthtim) - sizeof(ost->st_birthtim)); 2314 return (0); 2315 } 2316 2317 int 2318 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2319 { 2320 struct stat sb; 2321 struct freebsd11_stat osb; 2322 int error; 2323 2324 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2325 &sb, NULL); 2326 if (error != 0) 2327 return (error); 2328 error = freebsd11_cvtstat(&sb, &osb); 2329 if (error == 0) 2330 error = copyout(&osb, uap->ub, sizeof(osb)); 2331 return (error); 2332 } 2333 2334 int 2335 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2336 { 2337 struct stat sb; 2338 struct freebsd11_stat osb; 2339 int error; 2340 2341 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2342 UIO_USERSPACE, &sb, NULL); 2343 if (error != 0) 2344 return (error); 2345 error = freebsd11_cvtstat(&sb, &osb); 2346 if (error == 0) 2347 error = copyout(&osb, uap->ub, sizeof(osb)); 2348 return (error); 2349 } 2350 2351 int 2352 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2353 { 2354 struct fhandle fh; 2355 struct stat sb; 2356 struct freebsd11_stat osb; 2357 int error; 2358 2359 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2360 if (error != 0) 2361 return (error); 2362 error = kern_fhstat(td, fh, &sb); 2363 if (error != 0) 2364 return (error); 2365 error = freebsd11_cvtstat(&sb, &osb); 2366 if (error == 0) 2367 error = copyout(&osb, uap->sb, sizeof(osb)); 2368 return (error); 2369 } 2370 2371 int 2372 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2373 { 2374 struct stat sb; 2375 struct freebsd11_stat osb; 2376 int error; 2377 2378 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2379 UIO_USERSPACE, &sb, NULL); 2380 if (error != 0) 2381 return (error); 2382 error = freebsd11_cvtstat(&sb, &osb); 2383 if (error == 0) 2384 error = copyout(&osb, uap->buf, sizeof(osb)); 2385 return (error); 2386 } 2387 #endif /* COMPAT_FREEBSD11 */ 2388 2389 /* 2390 * Get file status 2391 */ 2392 #ifndef _SYS_SYSPROTO_H_ 2393 struct fstatat_args { 2394 int fd; 2395 char *path; 2396 struct stat *buf; 2397 int flag; 2398 } 2399 #endif 2400 int 2401 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2402 { 2403 struct stat sb; 2404 int error; 2405 2406 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2407 UIO_USERSPACE, &sb, NULL); 2408 if (error == 0) 2409 error = copyout(&sb, uap->buf, sizeof (sb)); 2410 return (error); 2411 } 2412 2413 int 2414 kern_statat(struct thread *td, int flag, int fd, const char *path, 2415 enum uio_seg pathseg, struct stat *sbp, 2416 void (*hook)(struct vnode *vp, struct stat *sbp)) 2417 { 2418 struct nameidata nd; 2419 int error; 2420 2421 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2422 AT_EMPTY_PATH)) != 0) 2423 return (EINVAL); 2424 2425 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH | 2426 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF | 2427 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, td); 2428 2429 if ((error = namei(&nd)) != 0) { 2430 if (error == ENOTDIR && 2431 (nd.ni_resflags & NIRES_EMPTYPATH) != 0) 2432 error = kern_fstat(td, fd, sbp); 2433 return (error); 2434 } 2435 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED, td); 2436 if (error == 0) { 2437 if (__predict_false(hook != NULL)) 2438 hook(nd.ni_vp, sbp); 2439 } 2440 NDFREE_NOTHING(&nd); 2441 vput(nd.ni_vp); 2442 #ifdef __STAT_TIME_T_EXT 2443 sbp->st_atim_ext = 0; 2444 sbp->st_mtim_ext = 0; 2445 sbp->st_ctim_ext = 0; 2446 sbp->st_btim_ext = 0; 2447 #endif 2448 #ifdef KTRACE 2449 if (KTRPOINT(td, KTR_STRUCT)) 2450 ktrstat_error(sbp, error); 2451 #endif 2452 return (error); 2453 } 2454 2455 #if defined(COMPAT_FREEBSD11) 2456 /* 2457 * Implementation of the NetBSD [l]stat() functions. 2458 */ 2459 void 2460 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2461 { 2462 2463 bzero(nsb, sizeof(*nsb)); 2464 nsb->st_dev = sb->st_dev; 2465 nsb->st_ino = sb->st_ino; 2466 nsb->st_mode = sb->st_mode; 2467 nsb->st_nlink = sb->st_nlink; 2468 nsb->st_uid = sb->st_uid; 2469 nsb->st_gid = sb->st_gid; 2470 nsb->st_rdev = sb->st_rdev; 2471 nsb->st_atim = sb->st_atim; 2472 nsb->st_mtim = sb->st_mtim; 2473 nsb->st_ctim = sb->st_ctim; 2474 nsb->st_size = sb->st_size; 2475 nsb->st_blocks = sb->st_blocks; 2476 nsb->st_blksize = sb->st_blksize; 2477 nsb->st_flags = sb->st_flags; 2478 nsb->st_gen = sb->st_gen; 2479 nsb->st_birthtim = sb->st_birthtim; 2480 } 2481 2482 #ifndef _SYS_SYSPROTO_H_ 2483 struct freebsd11_nstat_args { 2484 char *path; 2485 struct nstat *ub; 2486 }; 2487 #endif 2488 int 2489 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2490 { 2491 struct stat sb; 2492 struct nstat nsb; 2493 int error; 2494 2495 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2496 &sb, NULL); 2497 if (error != 0) 2498 return (error); 2499 freebsd11_cvtnstat(&sb, &nsb); 2500 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2501 } 2502 2503 /* 2504 * NetBSD lstat. Get file status; this version does not follow links. 2505 */ 2506 #ifndef _SYS_SYSPROTO_H_ 2507 struct freebsd11_nlstat_args { 2508 char *path; 2509 struct nstat *ub; 2510 }; 2511 #endif 2512 int 2513 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2514 { 2515 struct stat sb; 2516 struct nstat nsb; 2517 int error; 2518 2519 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2520 UIO_USERSPACE, &sb, NULL); 2521 if (error != 0) 2522 return (error); 2523 freebsd11_cvtnstat(&sb, &nsb); 2524 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2525 } 2526 #endif /* COMPAT_FREEBSD11 */ 2527 2528 /* 2529 * Get configurable pathname variables. 2530 */ 2531 #ifndef _SYS_SYSPROTO_H_ 2532 struct pathconf_args { 2533 char *path; 2534 int name; 2535 }; 2536 #endif 2537 int 2538 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2539 { 2540 long value; 2541 int error; 2542 2543 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2544 &value); 2545 if (error == 0) 2546 td->td_retval[0] = value; 2547 return (error); 2548 } 2549 2550 #ifndef _SYS_SYSPROTO_H_ 2551 struct lpathconf_args { 2552 char *path; 2553 int name; 2554 }; 2555 #endif 2556 int 2557 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2558 { 2559 long value; 2560 int error; 2561 2562 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2563 NOFOLLOW, &value); 2564 if (error == 0) 2565 td->td_retval[0] = value; 2566 return (error); 2567 } 2568 2569 int 2570 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2571 int name, u_long flags, long *valuep) 2572 { 2573 struct nameidata nd; 2574 int error; 2575 2576 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2577 pathseg, path, td); 2578 if ((error = namei(&nd)) != 0) 2579 return (error); 2580 NDFREE_NOTHING(&nd); 2581 2582 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2583 vput(nd.ni_vp); 2584 return (error); 2585 } 2586 2587 /* 2588 * Return target name of a symbolic link. 2589 */ 2590 #ifndef _SYS_SYSPROTO_H_ 2591 struct readlink_args { 2592 char *path; 2593 char *buf; 2594 size_t count; 2595 }; 2596 #endif 2597 int 2598 sys_readlink(struct thread *td, struct readlink_args *uap) 2599 { 2600 2601 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2602 uap->buf, UIO_USERSPACE, uap->count)); 2603 } 2604 #ifndef _SYS_SYSPROTO_H_ 2605 struct readlinkat_args { 2606 int fd; 2607 char *path; 2608 char *buf; 2609 size_t bufsize; 2610 }; 2611 #endif 2612 int 2613 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2614 { 2615 2616 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2617 uap->buf, UIO_USERSPACE, uap->bufsize)); 2618 } 2619 2620 int 2621 kern_readlinkat(struct thread *td, int fd, const char *path, 2622 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2623 { 2624 struct vnode *vp; 2625 struct nameidata nd; 2626 int error; 2627 2628 if (count > IOSIZE_MAX) 2629 return (EINVAL); 2630 2631 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | 2632 EMPTYPATH, pathseg, path, fd, td); 2633 2634 if ((error = namei(&nd)) != 0) 2635 return (error); 2636 NDFREE_NOTHING(&nd); 2637 vp = nd.ni_vp; 2638 2639 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2640 vput(vp); 2641 2642 return (error); 2643 } 2644 2645 /* 2646 * Helper function to readlink from a vnode 2647 */ 2648 static int 2649 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2650 struct thread *td) 2651 { 2652 struct iovec aiov; 2653 struct uio auio; 2654 int error; 2655 2656 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2657 #ifdef MAC 2658 error = mac_vnode_check_readlink(td->td_ucred, vp); 2659 if (error != 0) 2660 return (error); 2661 #endif 2662 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2663 return (EINVAL); 2664 2665 aiov.iov_base = buf; 2666 aiov.iov_len = count; 2667 auio.uio_iov = &aiov; 2668 auio.uio_iovcnt = 1; 2669 auio.uio_offset = 0; 2670 auio.uio_rw = UIO_READ; 2671 auio.uio_segflg = bufseg; 2672 auio.uio_td = td; 2673 auio.uio_resid = count; 2674 error = VOP_READLINK(vp, &auio, td->td_ucred); 2675 td->td_retval[0] = count - auio.uio_resid; 2676 return (error); 2677 } 2678 2679 /* 2680 * Common implementation code for chflags() and fchflags(). 2681 */ 2682 static int 2683 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2684 { 2685 struct mount *mp; 2686 struct vattr vattr; 2687 int error; 2688 2689 /* We can't support the value matching VNOVAL. */ 2690 if (flags == VNOVAL) 2691 return (EOPNOTSUPP); 2692 2693 /* 2694 * Prevent non-root users from setting flags on devices. When 2695 * a device is reused, users can retain ownership of the device 2696 * if they are allowed to set flags and programs assume that 2697 * chown can't fail when done as root. 2698 */ 2699 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2700 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2701 if (error != 0) 2702 return (error); 2703 } 2704 2705 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2706 return (error); 2707 VATTR_NULL(&vattr); 2708 vattr.va_flags = flags; 2709 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2710 #ifdef MAC 2711 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2712 if (error == 0) 2713 #endif 2714 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2715 VOP_UNLOCK(vp); 2716 vn_finished_write(mp); 2717 return (error); 2718 } 2719 2720 /* 2721 * Change flags of a file given a path name. 2722 */ 2723 #ifndef _SYS_SYSPROTO_H_ 2724 struct chflags_args { 2725 const char *path; 2726 u_long flags; 2727 }; 2728 #endif 2729 int 2730 sys_chflags(struct thread *td, struct chflags_args *uap) 2731 { 2732 2733 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2734 uap->flags, 0)); 2735 } 2736 2737 #ifndef _SYS_SYSPROTO_H_ 2738 struct chflagsat_args { 2739 int fd; 2740 const char *path; 2741 u_long flags; 2742 int atflag; 2743 } 2744 #endif 2745 int 2746 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2747 { 2748 2749 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2750 AT_EMPTY_PATH)) != 0) 2751 return (EINVAL); 2752 2753 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2754 uap->flags, uap->atflag)); 2755 } 2756 2757 /* 2758 * Same as chflags() but doesn't follow symlinks. 2759 */ 2760 #ifndef _SYS_SYSPROTO_H_ 2761 struct lchflags_args { 2762 const char *path; 2763 u_long flags; 2764 }; 2765 #endif 2766 int 2767 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2768 { 2769 2770 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2771 uap->flags, AT_SYMLINK_NOFOLLOW)); 2772 } 2773 2774 static int 2775 kern_chflagsat(struct thread *td, int fd, const char *path, 2776 enum uio_seg pathseg, u_long flags, int atflag) 2777 { 2778 struct nameidata nd; 2779 int error; 2780 2781 AUDIT_ARG_FFLAGS(flags); 2782 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW | 2783 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2784 fd, &cap_fchflags_rights, td); 2785 if ((error = namei(&nd)) != 0) 2786 return (error); 2787 NDFREE_NOTHING(&nd); 2788 error = setfflags(td, nd.ni_vp, flags); 2789 vrele(nd.ni_vp); 2790 return (error); 2791 } 2792 2793 /* 2794 * Change flags of a file given a file descriptor. 2795 */ 2796 #ifndef _SYS_SYSPROTO_H_ 2797 struct fchflags_args { 2798 int fd; 2799 u_long flags; 2800 }; 2801 #endif 2802 int 2803 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2804 { 2805 struct file *fp; 2806 int error; 2807 2808 AUDIT_ARG_FD(uap->fd); 2809 AUDIT_ARG_FFLAGS(uap->flags); 2810 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2811 &fp); 2812 if (error != 0) 2813 return (error); 2814 #ifdef AUDIT 2815 if (AUDITING_TD(td)) { 2816 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2817 AUDIT_ARG_VNODE1(fp->f_vnode); 2818 VOP_UNLOCK(fp->f_vnode); 2819 } 2820 #endif 2821 error = setfflags(td, fp->f_vnode, uap->flags); 2822 fdrop(fp, td); 2823 return (error); 2824 } 2825 2826 /* 2827 * Common implementation code for chmod(), lchmod() and fchmod(). 2828 */ 2829 int 2830 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2831 { 2832 struct mount *mp; 2833 struct vattr vattr; 2834 int error; 2835 2836 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2837 return (error); 2838 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2839 VATTR_NULL(&vattr); 2840 vattr.va_mode = mode & ALLPERMS; 2841 #ifdef MAC 2842 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2843 if (error == 0) 2844 #endif 2845 error = VOP_SETATTR(vp, &vattr, cred); 2846 VOP_UNLOCK(vp); 2847 vn_finished_write(mp); 2848 return (error); 2849 } 2850 2851 /* 2852 * Change mode of a file given path name. 2853 */ 2854 #ifndef _SYS_SYSPROTO_H_ 2855 struct chmod_args { 2856 char *path; 2857 int mode; 2858 }; 2859 #endif 2860 int 2861 sys_chmod(struct thread *td, struct chmod_args *uap) 2862 { 2863 2864 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2865 uap->mode, 0)); 2866 } 2867 2868 #ifndef _SYS_SYSPROTO_H_ 2869 struct fchmodat_args { 2870 int dirfd; 2871 char *path; 2872 mode_t mode; 2873 int flag; 2874 } 2875 #endif 2876 int 2877 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2878 { 2879 2880 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 2881 AT_EMPTY_PATH)) != 0) 2882 return (EINVAL); 2883 2884 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2885 uap->mode, uap->flag)); 2886 } 2887 2888 /* 2889 * Change mode of a file given path name (don't follow links.) 2890 */ 2891 #ifndef _SYS_SYSPROTO_H_ 2892 struct lchmod_args { 2893 char *path; 2894 int mode; 2895 }; 2896 #endif 2897 int 2898 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2899 { 2900 2901 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2902 uap->mode, AT_SYMLINK_NOFOLLOW)); 2903 } 2904 2905 int 2906 kern_fchmodat(struct thread *td, int fd, const char *path, 2907 enum uio_seg pathseg, mode_t mode, int flag) 2908 { 2909 struct nameidata nd; 2910 int error; 2911 2912 AUDIT_ARG_MODE(mode); 2913 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 2914 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 2915 fd, &cap_fchmod_rights, td); 2916 if ((error = namei(&nd)) != 0) 2917 return (error); 2918 NDFREE_NOTHING(&nd); 2919 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2920 vrele(nd.ni_vp); 2921 return (error); 2922 } 2923 2924 /* 2925 * Change mode of a file given a file descriptor. 2926 */ 2927 #ifndef _SYS_SYSPROTO_H_ 2928 struct fchmod_args { 2929 int fd; 2930 int mode; 2931 }; 2932 #endif 2933 int 2934 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2935 { 2936 struct file *fp; 2937 int error; 2938 2939 AUDIT_ARG_FD(uap->fd); 2940 AUDIT_ARG_MODE(uap->mode); 2941 2942 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2943 if (error != 0) 2944 return (error); 2945 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2946 fdrop(fp, td); 2947 return (error); 2948 } 2949 2950 /* 2951 * Common implementation for chown(), lchown(), and fchown() 2952 */ 2953 int 2954 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2955 gid_t gid) 2956 { 2957 struct mount *mp; 2958 struct vattr vattr; 2959 int error; 2960 2961 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2962 return (error); 2963 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2964 VATTR_NULL(&vattr); 2965 vattr.va_uid = uid; 2966 vattr.va_gid = gid; 2967 #ifdef MAC 2968 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2969 vattr.va_gid); 2970 if (error == 0) 2971 #endif 2972 error = VOP_SETATTR(vp, &vattr, cred); 2973 VOP_UNLOCK(vp); 2974 vn_finished_write(mp); 2975 return (error); 2976 } 2977 2978 /* 2979 * Set ownership given a path name. 2980 */ 2981 #ifndef _SYS_SYSPROTO_H_ 2982 struct chown_args { 2983 char *path; 2984 int uid; 2985 int gid; 2986 }; 2987 #endif 2988 int 2989 sys_chown(struct thread *td, struct chown_args *uap) 2990 { 2991 2992 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2993 uap->gid, 0)); 2994 } 2995 2996 #ifndef _SYS_SYSPROTO_H_ 2997 struct fchownat_args { 2998 int fd; 2999 const char * path; 3000 uid_t uid; 3001 gid_t gid; 3002 int flag; 3003 }; 3004 #endif 3005 int 3006 sys_fchownat(struct thread *td, struct fchownat_args *uap) 3007 { 3008 3009 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3010 AT_EMPTY_PATH)) != 0) 3011 return (EINVAL); 3012 3013 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 3014 uap->gid, uap->flag)); 3015 } 3016 3017 int 3018 kern_fchownat(struct thread *td, int fd, const char *path, 3019 enum uio_seg pathseg, int uid, int gid, int flag) 3020 { 3021 struct nameidata nd; 3022 int error; 3023 3024 AUDIT_ARG_OWNER(uid, gid); 3025 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3026 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path, 3027 fd, &cap_fchown_rights, td); 3028 3029 if ((error = namei(&nd)) != 0) 3030 return (error); 3031 NDFREE_NOTHING(&nd); 3032 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 3033 vrele(nd.ni_vp); 3034 return (error); 3035 } 3036 3037 /* 3038 * Set ownership given a path name, do not cross symlinks. 3039 */ 3040 #ifndef _SYS_SYSPROTO_H_ 3041 struct lchown_args { 3042 char *path; 3043 int uid; 3044 int gid; 3045 }; 3046 #endif 3047 int 3048 sys_lchown(struct thread *td, struct lchown_args *uap) 3049 { 3050 3051 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3052 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 3053 } 3054 3055 /* 3056 * Set ownership given a file descriptor. 3057 */ 3058 #ifndef _SYS_SYSPROTO_H_ 3059 struct fchown_args { 3060 int fd; 3061 int uid; 3062 int gid; 3063 }; 3064 #endif 3065 int 3066 sys_fchown(struct thread *td, struct fchown_args *uap) 3067 { 3068 struct file *fp; 3069 int error; 3070 3071 AUDIT_ARG_FD(uap->fd); 3072 AUDIT_ARG_OWNER(uap->uid, uap->gid); 3073 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 3074 if (error != 0) 3075 return (error); 3076 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 3077 fdrop(fp, td); 3078 return (error); 3079 } 3080 3081 /* 3082 * Common implementation code for utimes(), lutimes(), and futimes(). 3083 */ 3084 static int 3085 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 3086 struct timespec *tsp) 3087 { 3088 struct timeval tv[2]; 3089 const struct timeval *tvp; 3090 int error; 3091 3092 if (usrtvp == NULL) { 3093 vfs_timestamp(&tsp[0]); 3094 tsp[1] = tsp[0]; 3095 } else { 3096 if (tvpseg == UIO_SYSSPACE) { 3097 tvp = usrtvp; 3098 } else { 3099 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3100 return (error); 3101 tvp = tv; 3102 } 3103 3104 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3105 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3106 return (EINVAL); 3107 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3108 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3109 } 3110 return (0); 3111 } 3112 3113 /* 3114 * Common implementation code for futimens(), utimensat(). 3115 */ 3116 #define UTIMENS_NULL 0x1 3117 #define UTIMENS_EXIT 0x2 3118 static int 3119 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3120 struct timespec *tsp, int *retflags) 3121 { 3122 struct timespec tsnow; 3123 int error; 3124 3125 vfs_timestamp(&tsnow); 3126 *retflags = 0; 3127 if (usrtsp == NULL) { 3128 tsp[0] = tsnow; 3129 tsp[1] = tsnow; 3130 *retflags |= UTIMENS_NULL; 3131 return (0); 3132 } 3133 if (tspseg == UIO_SYSSPACE) { 3134 tsp[0] = usrtsp[0]; 3135 tsp[1] = usrtsp[1]; 3136 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3137 return (error); 3138 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3139 *retflags |= UTIMENS_EXIT; 3140 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3141 *retflags |= UTIMENS_NULL; 3142 if (tsp[0].tv_nsec == UTIME_OMIT) 3143 tsp[0].tv_sec = VNOVAL; 3144 else if (tsp[0].tv_nsec == UTIME_NOW) 3145 tsp[0] = tsnow; 3146 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3147 return (EINVAL); 3148 if (tsp[1].tv_nsec == UTIME_OMIT) 3149 tsp[1].tv_sec = VNOVAL; 3150 else if (tsp[1].tv_nsec == UTIME_NOW) 3151 tsp[1] = tsnow; 3152 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3153 return (EINVAL); 3154 3155 return (0); 3156 } 3157 3158 /* 3159 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3160 * and utimensat(). 3161 */ 3162 static int 3163 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3164 int numtimes, int nullflag) 3165 { 3166 struct mount *mp; 3167 struct vattr vattr; 3168 int error; 3169 bool setbirthtime; 3170 3171 setbirthtime = false; 3172 vattr.va_birthtime.tv_sec = VNOVAL; 3173 vattr.va_birthtime.tv_nsec = 0; 3174 3175 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3176 return (error); 3177 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3178 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred) == 0 && 3179 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3180 setbirthtime = true; 3181 VATTR_NULL(&vattr); 3182 vattr.va_atime = ts[0]; 3183 vattr.va_mtime = ts[1]; 3184 if (setbirthtime) 3185 vattr.va_birthtime = ts[1]; 3186 if (numtimes > 2) 3187 vattr.va_birthtime = ts[2]; 3188 if (nullflag) 3189 vattr.va_vaflags |= VA_UTIMES_NULL; 3190 #ifdef MAC 3191 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3192 vattr.va_mtime); 3193 #endif 3194 if (error == 0) 3195 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3196 VOP_UNLOCK(vp); 3197 vn_finished_write(mp); 3198 return (error); 3199 } 3200 3201 /* 3202 * Set the access and modification times of a file. 3203 */ 3204 #ifndef _SYS_SYSPROTO_H_ 3205 struct utimes_args { 3206 char *path; 3207 struct timeval *tptr; 3208 }; 3209 #endif 3210 int 3211 sys_utimes(struct thread *td, struct utimes_args *uap) 3212 { 3213 3214 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3215 uap->tptr, UIO_USERSPACE)); 3216 } 3217 3218 #ifndef _SYS_SYSPROTO_H_ 3219 struct futimesat_args { 3220 int fd; 3221 const char * path; 3222 const struct timeval * times; 3223 }; 3224 #endif 3225 int 3226 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3227 { 3228 3229 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3230 uap->times, UIO_USERSPACE)); 3231 } 3232 3233 int 3234 kern_utimesat(struct thread *td, int fd, const char *path, 3235 enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) 3236 { 3237 struct nameidata nd; 3238 struct timespec ts[2]; 3239 int error; 3240 3241 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3242 return (error); 3243 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3244 &cap_futimes_rights, td); 3245 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 lutimes_args { 3259 char *path; 3260 struct timeval *tptr; 3261 }; 3262 #endif 3263 int 3264 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3265 { 3266 3267 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3268 UIO_USERSPACE)); 3269 } 3270 3271 int 3272 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3273 struct timeval *tptr, enum uio_seg tptrseg) 3274 { 3275 struct timespec ts[2]; 3276 struct nameidata nd; 3277 int error; 3278 3279 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3280 return (error); 3281 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3282 if ((error = namei(&nd)) != 0) 3283 return (error); 3284 NDFREE_NOTHING(&nd); 3285 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3286 vrele(nd.ni_vp); 3287 return (error); 3288 } 3289 3290 /* 3291 * Set the access and modification times of a file. 3292 */ 3293 #ifndef _SYS_SYSPROTO_H_ 3294 struct futimes_args { 3295 int fd; 3296 struct timeval *tptr; 3297 }; 3298 #endif 3299 int 3300 sys_futimes(struct thread *td, struct futimes_args *uap) 3301 { 3302 3303 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3304 } 3305 3306 int 3307 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3308 enum uio_seg tptrseg) 3309 { 3310 struct timespec ts[2]; 3311 struct file *fp; 3312 int error; 3313 3314 AUDIT_ARG_FD(fd); 3315 error = getutimes(tptr, tptrseg, ts); 3316 if (error != 0) 3317 return (error); 3318 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3319 if (error != 0) 3320 return (error); 3321 #ifdef AUDIT 3322 if (AUDITING_TD(td)) { 3323 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3324 AUDIT_ARG_VNODE1(fp->f_vnode); 3325 VOP_UNLOCK(fp->f_vnode); 3326 } 3327 #endif 3328 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3329 fdrop(fp, td); 3330 return (error); 3331 } 3332 3333 int 3334 sys_futimens(struct thread *td, struct futimens_args *uap) 3335 { 3336 3337 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3338 } 3339 3340 int 3341 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3342 enum uio_seg tptrseg) 3343 { 3344 struct timespec ts[2]; 3345 struct file *fp; 3346 int error, flags; 3347 3348 AUDIT_ARG_FD(fd); 3349 error = getutimens(tptr, tptrseg, ts, &flags); 3350 if (error != 0) 3351 return (error); 3352 if (flags & UTIMENS_EXIT) 3353 return (0); 3354 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3355 if (error != 0) 3356 return (error); 3357 #ifdef AUDIT 3358 if (AUDITING_TD(td)) { 3359 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3360 AUDIT_ARG_VNODE1(fp->f_vnode); 3361 VOP_UNLOCK(fp->f_vnode); 3362 } 3363 #endif 3364 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3365 fdrop(fp, td); 3366 return (error); 3367 } 3368 3369 int 3370 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3371 { 3372 3373 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3374 uap->times, UIO_USERSPACE, uap->flag)); 3375 } 3376 3377 int 3378 kern_utimensat(struct thread *td, int fd, const char *path, 3379 enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg, 3380 int flag) 3381 { 3382 struct nameidata nd; 3383 struct timespec ts[2]; 3384 int error, flags; 3385 3386 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH | 3387 AT_EMPTY_PATH)) != 0) 3388 return (EINVAL); 3389 3390 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3391 return (error); 3392 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3393 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, 3394 pathseg, path, fd, &cap_futimes_rights, td); 3395 if ((error = namei(&nd)) != 0) 3396 return (error); 3397 /* 3398 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3399 * POSIX states: 3400 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3401 * "Search permission is denied by a component of the path prefix." 3402 */ 3403 NDFREE_NOTHING(&nd); 3404 if ((flags & UTIMENS_EXIT) == 0) 3405 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3406 vrele(nd.ni_vp); 3407 return (error); 3408 } 3409 3410 /* 3411 * Truncate a file given its path name. 3412 */ 3413 #ifndef _SYS_SYSPROTO_H_ 3414 struct truncate_args { 3415 char *path; 3416 int pad; 3417 off_t length; 3418 }; 3419 #endif 3420 int 3421 sys_truncate(struct thread *td, struct truncate_args *uap) 3422 { 3423 3424 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3425 } 3426 3427 int 3428 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3429 off_t length) 3430 { 3431 struct mount *mp; 3432 struct vnode *vp; 3433 void *rl_cookie; 3434 struct vattr vattr; 3435 struct nameidata nd; 3436 int error; 3437 3438 if (length < 0) 3439 return (EINVAL); 3440 NDPREINIT(&nd); 3441 retry: 3442 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3443 if ((error = namei(&nd)) != 0) 3444 return (error); 3445 vp = nd.ni_vp; 3446 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3447 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3448 vn_rangelock_unlock(vp, rl_cookie); 3449 vrele(vp); 3450 return (error); 3451 } 3452 NDFREE(&nd, NDF_ONLY_PNBUF); 3453 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3454 if (vp->v_type == VDIR) 3455 error = EISDIR; 3456 #ifdef MAC 3457 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3458 } 3459 #endif 3460 else if ((error = vn_writechk(vp)) == 0 && 3461 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3462 VATTR_NULL(&vattr); 3463 vattr.va_size = length; 3464 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3465 } 3466 VOP_UNLOCK(vp); 3467 vn_finished_write(mp); 3468 vn_rangelock_unlock(vp, rl_cookie); 3469 vrele(vp); 3470 if (error == ERELOOKUP) 3471 goto retry; 3472 return (error); 3473 } 3474 3475 #if defined(COMPAT_43) 3476 /* 3477 * Truncate a file given its path name. 3478 */ 3479 #ifndef _SYS_SYSPROTO_H_ 3480 struct otruncate_args { 3481 char *path; 3482 long length; 3483 }; 3484 #endif 3485 int 3486 otruncate(struct thread *td, struct otruncate_args *uap) 3487 { 3488 3489 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3490 } 3491 #endif /* COMPAT_43 */ 3492 3493 #if defined(COMPAT_FREEBSD6) 3494 /* Versions with the pad argument */ 3495 int 3496 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3497 { 3498 3499 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3500 } 3501 3502 int 3503 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3504 { 3505 3506 return (kern_ftruncate(td, uap->fd, uap->length)); 3507 } 3508 #endif 3509 3510 int 3511 kern_fsync(struct thread *td, int fd, bool fullsync) 3512 { 3513 struct vnode *vp; 3514 struct mount *mp; 3515 struct file *fp; 3516 int error; 3517 3518 AUDIT_ARG_FD(fd); 3519 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3520 if (error != 0) 3521 return (error); 3522 vp = fp->f_vnode; 3523 #if 0 3524 if (!fullsync) 3525 /* XXXKIB: compete outstanding aio writes */; 3526 #endif 3527 retry: 3528 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3529 if (error != 0) 3530 goto drop; 3531 vn_lock(vp, vn_lktype_write(mp, vp) | LK_RETRY); 3532 AUDIT_ARG_VNODE1(vp); 3533 if (vp->v_object != NULL) { 3534 VM_OBJECT_WLOCK(vp->v_object); 3535 vm_object_page_clean(vp->v_object, 0, 0, 0); 3536 VM_OBJECT_WUNLOCK(vp->v_object); 3537 } 3538 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3539 VOP_UNLOCK(vp); 3540 vn_finished_write(mp); 3541 if (error == ERELOOKUP) 3542 goto retry; 3543 drop: 3544 fdrop(fp, td); 3545 return (error); 3546 } 3547 3548 /* 3549 * Sync an open file. 3550 */ 3551 #ifndef _SYS_SYSPROTO_H_ 3552 struct fsync_args { 3553 int fd; 3554 }; 3555 #endif 3556 int 3557 sys_fsync(struct thread *td, struct fsync_args *uap) 3558 { 3559 3560 return (kern_fsync(td, uap->fd, true)); 3561 } 3562 3563 int 3564 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3565 { 3566 3567 return (kern_fsync(td, uap->fd, false)); 3568 } 3569 3570 /* 3571 * Rename files. Source and destination must either both be directories, or 3572 * both not be directories. If target is a directory, it must be empty. 3573 */ 3574 #ifndef _SYS_SYSPROTO_H_ 3575 struct rename_args { 3576 char *from; 3577 char *to; 3578 }; 3579 #endif 3580 int 3581 sys_rename(struct thread *td, struct rename_args *uap) 3582 { 3583 3584 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3585 uap->to, UIO_USERSPACE)); 3586 } 3587 3588 #ifndef _SYS_SYSPROTO_H_ 3589 struct renameat_args { 3590 int oldfd; 3591 char *old; 3592 int newfd; 3593 char *new; 3594 }; 3595 #endif 3596 int 3597 sys_renameat(struct thread *td, struct renameat_args *uap) 3598 { 3599 3600 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3601 UIO_USERSPACE)); 3602 } 3603 3604 #ifdef MAC 3605 static int 3606 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd, 3607 const char *new, enum uio_seg pathseg, struct nameidata *fromnd) 3608 { 3609 int error; 3610 3611 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3612 AUDITVNODE1, pathseg, old, oldfd, &cap_renameat_source_rights, td); 3613 if ((error = namei(fromnd)) != 0) 3614 return (error); 3615 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp, 3616 fromnd->ni_vp, &fromnd->ni_cnd); 3617 VOP_UNLOCK(fromnd->ni_dvp); 3618 if (fromnd->ni_dvp != fromnd->ni_vp) 3619 VOP_UNLOCK(fromnd->ni_vp); 3620 if (error != 0) { 3621 NDFREE(fromnd, NDF_ONLY_PNBUF); 3622 vrele(fromnd->ni_dvp); 3623 vrele(fromnd->ni_vp); 3624 if (fromnd->ni_startdir) 3625 vrele(fromnd->ni_startdir); 3626 } 3627 return (error); 3628 } 3629 #endif 3630 3631 int 3632 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3633 const char *new, enum uio_seg pathseg) 3634 { 3635 struct mount *mp = NULL; 3636 struct vnode *tvp, *fvp, *tdvp; 3637 struct nameidata fromnd, tond; 3638 u_int64_t tondflags; 3639 int error; 3640 3641 again: 3642 bwillwrite(); 3643 #ifdef MAC 3644 if (mac_vnode_check_rename_from_enabled()) { 3645 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg, 3646 &fromnd); 3647 if (error != 0) 3648 return (error); 3649 } else { 3650 #endif 3651 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3652 pathseg, old, oldfd, &cap_renameat_source_rights, td); 3653 if ((error = namei(&fromnd)) != 0) 3654 return (error); 3655 #ifdef MAC 3656 } 3657 #endif 3658 fvp = fromnd.ni_vp; 3659 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | AUDITVNODE2; 3660 if (fromnd.ni_vp->v_type == VDIR) 3661 tondflags |= WILLBEDIR; 3662 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd, 3663 &cap_renameat_target_rights, td); 3664 if ((error = namei(&tond)) != 0) { 3665 /* Translate error code for rename("dir1", "dir2/."). */ 3666 if (error == EISDIR && fvp->v_type == VDIR) 3667 error = EINVAL; 3668 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3669 vrele(fromnd.ni_dvp); 3670 vrele(fvp); 3671 goto out1; 3672 } 3673 tdvp = tond.ni_dvp; 3674 tvp = tond.ni_vp; 3675 error = vn_start_write(fvp, &mp, V_NOWAIT); 3676 if (error != 0) { 3677 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3678 NDFREE(&tond, NDF_ONLY_PNBUF); 3679 if (tvp != NULL) 3680 vput(tvp); 3681 if (tdvp == tvp) 3682 vrele(tdvp); 3683 else 3684 vput(tdvp); 3685 vrele(fromnd.ni_dvp); 3686 vrele(fvp); 3687 vrele(tond.ni_startdir); 3688 if (fromnd.ni_startdir != NULL) 3689 vrele(fromnd.ni_startdir); 3690 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3691 if (error != 0) 3692 return (error); 3693 goto again; 3694 } 3695 if (tvp != NULL) { 3696 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3697 error = ENOTDIR; 3698 goto out; 3699 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3700 error = EISDIR; 3701 goto out; 3702 } 3703 #ifdef CAPABILITIES 3704 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3705 /* 3706 * If the target already exists we require CAP_UNLINKAT 3707 * from 'newfd', when newfd was used for the lookup. 3708 */ 3709 error = cap_check(&tond.ni_filecaps.fc_rights, 3710 &cap_unlinkat_rights); 3711 if (error != 0) 3712 goto out; 3713 } 3714 #endif 3715 } 3716 if (fvp == tdvp) { 3717 error = EINVAL; 3718 goto out; 3719 } 3720 /* 3721 * If the source is the same as the destination (that is, if they 3722 * are links to the same vnode), then there is nothing to do. 3723 */ 3724 if (fvp == tvp) 3725 error = ERESTART; 3726 #ifdef MAC 3727 else 3728 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3729 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3730 #endif 3731 out: 3732 if (error == 0) { 3733 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3734 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3735 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3736 NDFREE(&tond, NDF_ONLY_PNBUF); 3737 } else { 3738 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3739 NDFREE(&tond, NDF_ONLY_PNBUF); 3740 if (tvp != NULL) 3741 vput(tvp); 3742 if (tdvp == tvp) 3743 vrele(tdvp); 3744 else 3745 vput(tdvp); 3746 vrele(fromnd.ni_dvp); 3747 vrele(fvp); 3748 } 3749 vrele(tond.ni_startdir); 3750 vn_finished_write(mp); 3751 out1: 3752 if (fromnd.ni_startdir) 3753 vrele(fromnd.ni_startdir); 3754 if (error == ERESTART) 3755 return (0); 3756 if (error == ERELOOKUP) 3757 goto again; 3758 return (error); 3759 } 3760 3761 /* 3762 * Make a directory file. 3763 */ 3764 #ifndef _SYS_SYSPROTO_H_ 3765 struct mkdir_args { 3766 char *path; 3767 int mode; 3768 }; 3769 #endif 3770 int 3771 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3772 { 3773 3774 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3775 uap->mode)); 3776 } 3777 3778 #ifndef _SYS_SYSPROTO_H_ 3779 struct mkdirat_args { 3780 int fd; 3781 char *path; 3782 mode_t mode; 3783 }; 3784 #endif 3785 int 3786 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3787 { 3788 3789 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3790 } 3791 3792 int 3793 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3794 int mode) 3795 { 3796 struct mount *mp; 3797 struct vattr vattr; 3798 struct nameidata nd; 3799 int error; 3800 3801 AUDIT_ARG_MODE(mode); 3802 NDPREINIT(&nd); 3803 restart: 3804 bwillwrite(); 3805 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3806 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR, 3807 segflg, path, fd, &cap_mkdirat_rights, td); 3808 if ((error = namei(&nd)) != 0) 3809 return (error); 3810 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3811 NDFREE(&nd, NDF_ONLY_PNBUF); 3812 vput(nd.ni_dvp); 3813 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3814 return (error); 3815 goto restart; 3816 } 3817 VATTR_NULL(&vattr); 3818 vattr.va_type = VDIR; 3819 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask; 3820 #ifdef MAC 3821 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3822 &vattr); 3823 if (error != 0) 3824 goto out; 3825 #endif 3826 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3827 #ifdef MAC 3828 out: 3829 #endif 3830 NDFREE(&nd, NDF_ONLY_PNBUF); 3831 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true); 3832 vn_finished_write(mp); 3833 if (error == ERELOOKUP) 3834 goto restart; 3835 return (error); 3836 } 3837 3838 /* 3839 * Remove a directory file. 3840 */ 3841 #ifndef _SYS_SYSPROTO_H_ 3842 struct rmdir_args { 3843 char *path; 3844 }; 3845 #endif 3846 int 3847 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3848 { 3849 3850 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3851 0)); 3852 } 3853 3854 int 3855 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3856 enum uio_seg pathseg, int flag) 3857 { 3858 struct mount *mp; 3859 struct vnode *vp; 3860 struct file *fp; 3861 struct nameidata nd; 3862 cap_rights_t rights; 3863 int error; 3864 3865 fp = NULL; 3866 if (fd != FD_NONE) { 3867 error = getvnode(td, fd, cap_rights_init_one(&rights, 3868 CAP_LOOKUP), &fp); 3869 if (error != 0) 3870 return (error); 3871 } 3872 3873 NDPREINIT(&nd); 3874 restart: 3875 bwillwrite(); 3876 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3877 at2cnpflags(flag, AT_RESOLVE_BENEATH), 3878 pathseg, path, dfd, &cap_unlinkat_rights, td); 3879 if ((error = namei(&nd)) != 0) 3880 goto fdout; 3881 vp = nd.ni_vp; 3882 if (vp->v_type != VDIR) { 3883 error = ENOTDIR; 3884 goto out; 3885 } 3886 /* 3887 * No rmdir "." please. 3888 */ 3889 if (nd.ni_dvp == vp) { 3890 error = EINVAL; 3891 goto out; 3892 } 3893 /* 3894 * The root of a mounted filesystem cannot be deleted. 3895 */ 3896 if (vp->v_vflag & VV_ROOT) { 3897 error = EBUSY; 3898 goto out; 3899 } 3900 3901 if (fp != NULL && fp->f_vnode != vp) { 3902 if (VN_IS_DOOMED(fp->f_vnode)) 3903 error = EBADF; 3904 else 3905 error = EDEADLK; 3906 goto out; 3907 } 3908 3909 #ifdef MAC 3910 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3911 &nd.ni_cnd); 3912 if (error != 0) 3913 goto out; 3914 #endif 3915 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3916 NDFREE(&nd, NDF_ONLY_PNBUF); 3917 vput(vp); 3918 if (nd.ni_dvp == vp) 3919 vrele(nd.ni_dvp); 3920 else 3921 vput(nd.ni_dvp); 3922 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3923 goto fdout; 3924 goto restart; 3925 } 3926 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3927 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3928 vn_finished_write(mp); 3929 out: 3930 NDFREE(&nd, NDF_ONLY_PNBUF); 3931 vput(vp); 3932 if (nd.ni_dvp == vp) 3933 vrele(nd.ni_dvp); 3934 else 3935 vput(nd.ni_dvp); 3936 if (error == ERELOOKUP) 3937 goto restart; 3938 fdout: 3939 if (fp != NULL) 3940 fdrop(fp, td); 3941 return (error); 3942 } 3943 3944 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3945 int 3946 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3947 long *basep, void (*func)(struct freebsd11_dirent *)) 3948 { 3949 struct freebsd11_dirent dstdp; 3950 struct dirent *dp, *edp; 3951 char *dirbuf; 3952 off_t base; 3953 ssize_t resid, ucount; 3954 int error; 3955 3956 /* XXX arbitrary sanity limit on `count'. */ 3957 count = min(count, 64 * 1024); 3958 3959 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3960 3961 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3962 UIO_SYSSPACE); 3963 if (error != 0) 3964 goto done; 3965 if (basep != NULL) 3966 *basep = base; 3967 3968 ucount = 0; 3969 for (dp = (struct dirent *)dirbuf, 3970 edp = (struct dirent *)&dirbuf[count - resid]; 3971 ucount < count && dp < edp; ) { 3972 if (dp->d_reclen == 0) 3973 break; 3974 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3975 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3976 continue; 3977 dstdp.d_type = dp->d_type; 3978 dstdp.d_namlen = dp->d_namlen; 3979 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3980 if (dstdp.d_fileno != dp->d_fileno) { 3981 switch (ino64_trunc_error) { 3982 default: 3983 case 0: 3984 break; 3985 case 1: 3986 error = EOVERFLOW; 3987 goto done; 3988 case 2: 3989 dstdp.d_fileno = UINT32_MAX; 3990 break; 3991 } 3992 } 3993 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3994 ((dp->d_namlen + 1 + 3) &~ 3); 3995 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3996 bzero(dstdp.d_name + dstdp.d_namlen, 3997 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3998 dstdp.d_namlen); 3999 MPASS(dstdp.d_reclen <= dp->d_reclen); 4000 MPASS(ucount + dstdp.d_reclen <= count); 4001 if (func != NULL) 4002 func(&dstdp); 4003 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 4004 if (error != 0) 4005 break; 4006 dp = (struct dirent *)((char *)dp + dp->d_reclen); 4007 ucount += dstdp.d_reclen; 4008 } 4009 4010 done: 4011 free(dirbuf, M_TEMP); 4012 if (error == 0) 4013 td->td_retval[0] = ucount; 4014 return (error); 4015 } 4016 #endif /* COMPAT */ 4017 4018 #ifdef COMPAT_43 4019 static void 4020 ogetdirentries_cvt(struct freebsd11_dirent *dp) 4021 { 4022 #if (BYTE_ORDER == LITTLE_ENDIAN) 4023 /* 4024 * The expected low byte of dp->d_namlen is our dp->d_type. 4025 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 4026 */ 4027 dp->d_type = dp->d_namlen; 4028 dp->d_namlen = 0; 4029 #else 4030 /* 4031 * The dp->d_type is the high byte of the expected dp->d_namlen, 4032 * so must be zero'ed. 4033 */ 4034 dp->d_type = 0; 4035 #endif 4036 } 4037 4038 /* 4039 * Read a block of directory entries in a filesystem independent format. 4040 */ 4041 #ifndef _SYS_SYSPROTO_H_ 4042 struct ogetdirentries_args { 4043 int fd; 4044 char *buf; 4045 u_int count; 4046 long *basep; 4047 }; 4048 #endif 4049 int 4050 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 4051 { 4052 long loff; 4053 int error; 4054 4055 error = kern_ogetdirentries(td, uap, &loff); 4056 if (error == 0) 4057 error = copyout(&loff, uap->basep, sizeof(long)); 4058 return (error); 4059 } 4060 4061 int 4062 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 4063 long *ploff) 4064 { 4065 long base; 4066 int error; 4067 4068 /* XXX arbitrary sanity limit on `count'. */ 4069 if (uap->count > 64 * 1024) 4070 return (EINVAL); 4071 4072 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4073 &base, ogetdirentries_cvt); 4074 4075 if (error == 0 && uap->basep != NULL) 4076 error = copyout(&base, uap->basep, sizeof(long)); 4077 4078 return (error); 4079 } 4080 #endif /* COMPAT_43 */ 4081 4082 #if defined(COMPAT_FREEBSD11) 4083 #ifndef _SYS_SYSPROTO_H_ 4084 struct freebsd11_getdirentries_args { 4085 int fd; 4086 char *buf; 4087 u_int count; 4088 long *basep; 4089 }; 4090 #endif 4091 int 4092 freebsd11_getdirentries(struct thread *td, 4093 struct freebsd11_getdirentries_args *uap) 4094 { 4095 long base; 4096 int error; 4097 4098 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 4099 &base, NULL); 4100 4101 if (error == 0 && uap->basep != NULL) 4102 error = copyout(&base, uap->basep, sizeof(long)); 4103 return (error); 4104 } 4105 4106 int 4107 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 4108 { 4109 struct freebsd11_getdirentries_args ap; 4110 4111 ap.fd = uap->fd; 4112 ap.buf = uap->buf; 4113 ap.count = uap->count; 4114 ap.basep = NULL; 4115 return (freebsd11_getdirentries(td, &ap)); 4116 } 4117 #endif /* COMPAT_FREEBSD11 */ 4118 4119 /* 4120 * Read a block of directory entries in a filesystem independent format. 4121 */ 4122 int 4123 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4124 { 4125 off_t base; 4126 int error; 4127 4128 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4129 NULL, UIO_USERSPACE); 4130 if (error != 0) 4131 return (error); 4132 if (uap->basep != NULL) 4133 error = copyout(&base, uap->basep, sizeof(off_t)); 4134 return (error); 4135 } 4136 4137 int 4138 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4139 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4140 { 4141 struct vnode *vp; 4142 struct file *fp; 4143 struct uio auio; 4144 struct iovec aiov; 4145 off_t loff; 4146 int error, eofflag; 4147 off_t foffset; 4148 4149 AUDIT_ARG_FD(fd); 4150 if (count > IOSIZE_MAX) 4151 return (EINVAL); 4152 auio.uio_resid = count; 4153 error = getvnode(td, fd, &cap_read_rights, &fp); 4154 if (error != 0) 4155 return (error); 4156 if ((fp->f_flag & FREAD) == 0) { 4157 fdrop(fp, td); 4158 return (EBADF); 4159 } 4160 vp = fp->f_vnode; 4161 foffset = foffset_lock(fp, 0); 4162 unionread: 4163 if (vp->v_type != VDIR) { 4164 error = EINVAL; 4165 goto fail; 4166 } 4167 aiov.iov_base = buf; 4168 aiov.iov_len = count; 4169 auio.uio_iov = &aiov; 4170 auio.uio_iovcnt = 1; 4171 auio.uio_rw = UIO_READ; 4172 auio.uio_segflg = bufseg; 4173 auio.uio_td = td; 4174 vn_lock(vp, LK_SHARED | LK_RETRY); 4175 AUDIT_ARG_VNODE1(vp); 4176 loff = auio.uio_offset = foffset; 4177 #ifdef MAC 4178 error = mac_vnode_check_readdir(td->td_ucred, vp); 4179 if (error == 0) 4180 #endif 4181 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4182 NULL); 4183 foffset = auio.uio_offset; 4184 if (error != 0) { 4185 VOP_UNLOCK(vp); 4186 goto fail; 4187 } 4188 if (count == auio.uio_resid && 4189 (vp->v_vflag & VV_ROOT) && 4190 (vp->v_mount->mnt_flag & MNT_UNION)) { 4191 struct vnode *tvp = vp; 4192 4193 vp = vp->v_mount->mnt_vnodecovered; 4194 VREF(vp); 4195 fp->f_vnode = vp; 4196 foffset = 0; 4197 vput(tvp); 4198 goto unionread; 4199 } 4200 VOP_UNLOCK(vp); 4201 *basep = loff; 4202 if (residp != NULL) 4203 *residp = auio.uio_resid; 4204 td->td_retval[0] = count - auio.uio_resid; 4205 fail: 4206 foffset_unlock(fp, foffset, 0); 4207 fdrop(fp, td); 4208 return (error); 4209 } 4210 4211 /* 4212 * Set the mode mask for creation of filesystem nodes. 4213 */ 4214 #ifndef _SYS_SYSPROTO_H_ 4215 struct umask_args { 4216 int newmask; 4217 }; 4218 #endif 4219 int 4220 sys_umask(struct thread *td, struct umask_args *uap) 4221 { 4222 struct pwddesc *pdp; 4223 4224 pdp = td->td_proc->p_pd; 4225 PWDDESC_XLOCK(pdp); 4226 td->td_retval[0] = pdp->pd_cmask; 4227 pdp->pd_cmask = uap->newmask & ALLPERMS; 4228 PWDDESC_XUNLOCK(pdp); 4229 return (0); 4230 } 4231 4232 /* 4233 * Void all references to file by ripping underlying filesystem away from 4234 * vnode. 4235 */ 4236 #ifndef _SYS_SYSPROTO_H_ 4237 struct revoke_args { 4238 char *path; 4239 }; 4240 #endif 4241 int 4242 sys_revoke(struct thread *td, struct revoke_args *uap) 4243 { 4244 struct vnode *vp; 4245 struct vattr vattr; 4246 struct nameidata nd; 4247 int error; 4248 4249 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4250 uap->path, td); 4251 if ((error = namei(&nd)) != 0) 4252 return (error); 4253 vp = nd.ni_vp; 4254 NDFREE_NOTHING(&nd); 4255 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4256 error = EINVAL; 4257 goto out; 4258 } 4259 #ifdef MAC 4260 error = mac_vnode_check_revoke(td->td_ucred, vp); 4261 if (error != 0) 4262 goto out; 4263 #endif 4264 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4265 if (error != 0) 4266 goto out; 4267 if (td->td_ucred->cr_uid != vattr.va_uid) { 4268 error = priv_check(td, PRIV_VFS_ADMIN); 4269 if (error != 0) 4270 goto out; 4271 } 4272 if (devfs_usecount(vp) > 0) 4273 VOP_REVOKE(vp, REVOKEALL); 4274 out: 4275 vput(vp); 4276 return (error); 4277 } 4278 4279 /* 4280 * This variant of getvnode() allows O_PATH files. Caller should 4281 * ensure that returned file and vnode are only used for compatible 4282 * semantics. 4283 */ 4284 int 4285 getvnode_path(struct thread *td, int fd, cap_rights_t *rightsp, 4286 struct file **fpp) 4287 { 4288 struct file *fp; 4289 int error; 4290 4291 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp); 4292 if (error != 0) 4293 return (error); 4294 4295 /* 4296 * The file could be not of the vnode type, or it may be not 4297 * yet fully initialized, in which case the f_vnode pointer 4298 * may be set, but f_ops is still badfileops. E.g., 4299 * devfs_open() transiently create such situation to 4300 * facilitate csw d_fdopen(). 4301 * 4302 * Dupfdopen() handling in kern_openat() installs the 4303 * half-baked file into the process descriptor table, allowing 4304 * other thread to dereference it. Guard against the race by 4305 * checking f_ops. 4306 */ 4307 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4308 fdrop(fp, td); 4309 return (EINVAL); 4310 } 4311 4312 *fpp = fp; 4313 return (0); 4314 } 4315 4316 /* 4317 * Convert a user file descriptor to a kernel file entry and check 4318 * that, if it is a capability, the correct rights are present. 4319 * A reference on the file entry is held upon returning. 4320 */ 4321 int 4322 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4323 { 4324 int error; 4325 4326 error = getvnode_path(td, fd, rightsp, fpp); 4327 4328 /* 4329 * Filter out O_PATH file descriptors, most getvnode() callers 4330 * do not call fo_ methods. 4331 */ 4332 if (error == 0 && (*fpp)->f_ops == &path_fileops) { 4333 fdrop(*fpp, td); 4334 error = EBADF; 4335 } 4336 4337 return (error); 4338 } 4339 4340 /* 4341 * Get an (NFS) file handle. 4342 */ 4343 #ifndef _SYS_SYSPROTO_H_ 4344 struct lgetfh_args { 4345 char *fname; 4346 fhandle_t *fhp; 4347 }; 4348 #endif 4349 int 4350 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4351 { 4352 4353 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4354 UIO_USERSPACE, uap->fhp, UIO_USERSPACE)); 4355 } 4356 4357 #ifndef _SYS_SYSPROTO_H_ 4358 struct getfh_args { 4359 char *fname; 4360 fhandle_t *fhp; 4361 }; 4362 #endif 4363 int 4364 sys_getfh(struct thread *td, struct getfh_args *uap) 4365 { 4366 4367 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4368 uap->fhp, UIO_USERSPACE)); 4369 } 4370 4371 /* 4372 * syscall for the rpc.lockd to use to translate an open descriptor into 4373 * a NFS file handle. 4374 * 4375 * warning: do not remove the priv_check() call or this becomes one giant 4376 * security hole. 4377 */ 4378 #ifndef _SYS_SYSPROTO_H_ 4379 struct getfhat_args { 4380 int fd; 4381 char *path; 4382 fhandle_t *fhp; 4383 int flags; 4384 }; 4385 #endif 4386 int 4387 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4388 { 4389 4390 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4391 return (EINVAL); 4392 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4393 uap->fhp, UIO_USERSPACE)); 4394 } 4395 4396 int 4397 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4398 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg) 4399 { 4400 struct nameidata nd; 4401 fhandle_t fh; 4402 struct vnode *vp; 4403 int error; 4404 4405 error = priv_check(td, PRIV_VFS_GETFH); 4406 if (error != 0) 4407 return (error); 4408 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4409 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4410 fd, td); 4411 error = namei(&nd); 4412 if (error != 0) 4413 return (error); 4414 NDFREE_NOTHING(&nd); 4415 vp = nd.ni_vp; 4416 bzero(&fh, sizeof(fh)); 4417 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4418 error = VOP_VPTOFH(vp, &fh.fh_fid); 4419 vput(vp); 4420 if (error == 0) { 4421 if (fhseg == UIO_USERSPACE) 4422 error = copyout(&fh, fhp, sizeof (fh)); 4423 else 4424 memcpy(fhp, &fh, sizeof(fh)); 4425 } 4426 return (error); 4427 } 4428 4429 #ifndef _SYS_SYSPROTO_H_ 4430 struct fhlink_args { 4431 fhandle_t *fhp; 4432 const char *to; 4433 }; 4434 #endif 4435 int 4436 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4437 { 4438 4439 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4440 } 4441 4442 #ifndef _SYS_SYSPROTO_H_ 4443 struct fhlinkat_args { 4444 fhandle_t *fhp; 4445 int tofd; 4446 const char *to; 4447 }; 4448 #endif 4449 int 4450 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4451 { 4452 4453 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4454 } 4455 4456 static int 4457 kern_fhlinkat(struct thread *td, int fd, const char *path, 4458 enum uio_seg pathseg, fhandle_t *fhp) 4459 { 4460 fhandle_t fh; 4461 struct mount *mp; 4462 struct vnode *vp; 4463 int error; 4464 4465 error = priv_check(td, PRIV_VFS_GETFH); 4466 if (error != 0) 4467 return (error); 4468 error = copyin(fhp, &fh, sizeof(fh)); 4469 if (error != 0) 4470 return (error); 4471 do { 4472 bwillwrite(); 4473 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4474 return (ESTALE); 4475 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4476 vfs_unbusy(mp); 4477 if (error != 0) 4478 return (error); 4479 VOP_UNLOCK(vp); 4480 error = kern_linkat_vp(td, vp, fd, path, pathseg); 4481 } while (error == EAGAIN || error == ERELOOKUP); 4482 return (error); 4483 } 4484 4485 #ifndef _SYS_SYSPROTO_H_ 4486 struct fhreadlink_args { 4487 fhandle_t *fhp; 4488 char *buf; 4489 size_t bufsize; 4490 }; 4491 #endif 4492 int 4493 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4494 { 4495 fhandle_t fh; 4496 struct mount *mp; 4497 struct vnode *vp; 4498 int error; 4499 4500 error = priv_check(td, PRIV_VFS_GETFH); 4501 if (error != 0) 4502 return (error); 4503 if (uap->bufsize > IOSIZE_MAX) 4504 return (EINVAL); 4505 error = copyin(uap->fhp, &fh, sizeof(fh)); 4506 if (error != 0) 4507 return (error); 4508 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4509 return (ESTALE); 4510 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4511 vfs_unbusy(mp); 4512 if (error != 0) 4513 return (error); 4514 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4515 vput(vp); 4516 return (error); 4517 } 4518 4519 /* 4520 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4521 * open descriptor. 4522 * 4523 * warning: do not remove the priv_check() call or this becomes one giant 4524 * security hole. 4525 */ 4526 #ifndef _SYS_SYSPROTO_H_ 4527 struct fhopen_args { 4528 const struct fhandle *u_fhp; 4529 int flags; 4530 }; 4531 #endif 4532 int 4533 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4534 { 4535 return (kern_fhopen(td, uap->u_fhp, uap->flags)); 4536 } 4537 4538 int 4539 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags) 4540 { 4541 struct mount *mp; 4542 struct vnode *vp; 4543 struct fhandle fhp; 4544 struct file *fp; 4545 int fmode, error; 4546 int indx; 4547 4548 error = priv_check(td, PRIV_VFS_FHOPEN); 4549 if (error != 0) 4550 return (error); 4551 indx = -1; 4552 fmode = FFLAGS(flags); 4553 /* why not allow a non-read/write open for our lockd? */ 4554 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4555 return (EINVAL); 4556 error = copyin(u_fhp, &fhp, sizeof(fhp)); 4557 if (error != 0) 4558 return(error); 4559 /* find the mount point */ 4560 mp = vfs_busyfs(&fhp.fh_fsid); 4561 if (mp == NULL) 4562 return (ESTALE); 4563 /* now give me my vnode, it gets returned to me locked */ 4564 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4565 vfs_unbusy(mp); 4566 if (error != 0) 4567 return (error); 4568 4569 error = falloc_noinstall(td, &fp); 4570 if (error != 0) { 4571 vput(vp); 4572 return (error); 4573 } 4574 /* 4575 * An extra reference on `fp' has been held for us by 4576 * falloc_noinstall(). 4577 */ 4578 4579 #ifdef INVARIANTS 4580 td->td_dupfd = -1; 4581 #endif 4582 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4583 if (error != 0) { 4584 KASSERT(fp->f_ops == &badfileops, 4585 ("VOP_OPEN in fhopen() set f_ops")); 4586 KASSERT(td->td_dupfd < 0, 4587 ("fhopen() encountered fdopen()")); 4588 4589 vput(vp); 4590 goto bad; 4591 } 4592 #ifdef INVARIANTS 4593 td->td_dupfd = 0; 4594 #endif 4595 fp->f_vnode = vp; 4596 finit_vnode(fp, fmode, NULL, &vnops); 4597 VOP_UNLOCK(vp); 4598 if ((fmode & O_TRUNC) != 0) { 4599 error = fo_truncate(fp, 0, td->td_ucred, td); 4600 if (error != 0) 4601 goto bad; 4602 } 4603 4604 error = finstall(td, fp, &indx, fmode, NULL); 4605 bad: 4606 fdrop(fp, td); 4607 td->td_retval[0] = indx; 4608 return (error); 4609 } 4610 4611 /* 4612 * Stat an (NFS) file handle. 4613 */ 4614 #ifndef _SYS_SYSPROTO_H_ 4615 struct fhstat_args { 4616 struct fhandle *u_fhp; 4617 struct stat *sb; 4618 }; 4619 #endif 4620 int 4621 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4622 { 4623 struct stat sb; 4624 struct fhandle fh; 4625 int error; 4626 4627 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4628 if (error != 0) 4629 return (error); 4630 error = kern_fhstat(td, fh, &sb); 4631 if (error == 0) 4632 error = copyout(&sb, uap->sb, sizeof(sb)); 4633 return (error); 4634 } 4635 4636 int 4637 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4638 { 4639 struct mount *mp; 4640 struct vnode *vp; 4641 int error; 4642 4643 error = priv_check(td, PRIV_VFS_FHSTAT); 4644 if (error != 0) 4645 return (error); 4646 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4647 return (ESTALE); 4648 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4649 vfs_unbusy(mp); 4650 if (error != 0) 4651 return (error); 4652 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED, td); 4653 vput(vp); 4654 return (error); 4655 } 4656 4657 /* 4658 * Implement fstatfs() for (NFS) file handles. 4659 */ 4660 #ifndef _SYS_SYSPROTO_H_ 4661 struct fhstatfs_args { 4662 struct fhandle *u_fhp; 4663 struct statfs *buf; 4664 }; 4665 #endif 4666 int 4667 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4668 { 4669 struct statfs *sfp; 4670 fhandle_t fh; 4671 int error; 4672 4673 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4674 if (error != 0) 4675 return (error); 4676 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4677 error = kern_fhstatfs(td, fh, sfp); 4678 if (error == 0) 4679 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4680 free(sfp, M_STATFS); 4681 return (error); 4682 } 4683 4684 int 4685 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4686 { 4687 struct mount *mp; 4688 struct vnode *vp; 4689 int error; 4690 4691 error = priv_check(td, PRIV_VFS_FHSTATFS); 4692 if (error != 0) 4693 return (error); 4694 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4695 return (ESTALE); 4696 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4697 if (error != 0) { 4698 vfs_unbusy(mp); 4699 return (error); 4700 } 4701 vput(vp); 4702 error = prison_canseemount(td->td_ucred, mp); 4703 if (error != 0) 4704 goto out; 4705 #ifdef MAC 4706 error = mac_mount_check_stat(td->td_ucred, mp); 4707 if (error != 0) 4708 goto out; 4709 #endif 4710 error = VFS_STATFS(mp, buf); 4711 out: 4712 vfs_unbusy(mp); 4713 return (error); 4714 } 4715 4716 /* 4717 * Unlike madvise(2), we do not make a best effort to remember every 4718 * possible caching hint. Instead, we remember the last setting with 4719 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4720 * region of any current setting. 4721 */ 4722 int 4723 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4724 int advice) 4725 { 4726 struct fadvise_info *fa, *new; 4727 struct file *fp; 4728 struct vnode *vp; 4729 off_t end; 4730 int error; 4731 4732 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4733 return (EINVAL); 4734 AUDIT_ARG_VALUE(advice); 4735 switch (advice) { 4736 case POSIX_FADV_SEQUENTIAL: 4737 case POSIX_FADV_RANDOM: 4738 case POSIX_FADV_NOREUSE: 4739 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4740 break; 4741 case POSIX_FADV_NORMAL: 4742 case POSIX_FADV_WILLNEED: 4743 case POSIX_FADV_DONTNEED: 4744 new = NULL; 4745 break; 4746 default: 4747 return (EINVAL); 4748 } 4749 /* XXX: CAP_POSIX_FADVISE? */ 4750 AUDIT_ARG_FD(fd); 4751 error = fget(td, fd, &cap_no_rights, &fp); 4752 if (error != 0) 4753 goto out; 4754 AUDIT_ARG_FILE(td->td_proc, fp); 4755 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4756 error = ESPIPE; 4757 goto out; 4758 } 4759 if (fp->f_type != DTYPE_VNODE) { 4760 error = ENODEV; 4761 goto out; 4762 } 4763 vp = fp->f_vnode; 4764 if (vp->v_type != VREG) { 4765 error = ENODEV; 4766 goto out; 4767 } 4768 if (len == 0) 4769 end = OFF_MAX; 4770 else 4771 end = offset + len - 1; 4772 switch (advice) { 4773 case POSIX_FADV_SEQUENTIAL: 4774 case POSIX_FADV_RANDOM: 4775 case POSIX_FADV_NOREUSE: 4776 /* 4777 * Try to merge any existing non-standard region with 4778 * this new region if possible, otherwise create a new 4779 * non-standard region for this request. 4780 */ 4781 mtx_pool_lock(mtxpool_sleep, fp); 4782 fa = fp->f_advice; 4783 if (fa != NULL && fa->fa_advice == advice && 4784 ((fa->fa_start <= end && fa->fa_end >= offset) || 4785 (end != OFF_MAX && fa->fa_start == end + 1) || 4786 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4787 if (offset < fa->fa_start) 4788 fa->fa_start = offset; 4789 if (end > fa->fa_end) 4790 fa->fa_end = end; 4791 } else { 4792 new->fa_advice = advice; 4793 new->fa_start = offset; 4794 new->fa_end = end; 4795 fp->f_advice = new; 4796 new = fa; 4797 } 4798 mtx_pool_unlock(mtxpool_sleep, fp); 4799 break; 4800 case POSIX_FADV_NORMAL: 4801 /* 4802 * If a the "normal" region overlaps with an existing 4803 * non-standard region, trim or remove the 4804 * non-standard region. 4805 */ 4806 mtx_pool_lock(mtxpool_sleep, fp); 4807 fa = fp->f_advice; 4808 if (fa != NULL) { 4809 if (offset <= fa->fa_start && end >= fa->fa_end) { 4810 new = fa; 4811 fp->f_advice = NULL; 4812 } else if (offset <= fa->fa_start && 4813 end >= fa->fa_start) 4814 fa->fa_start = end + 1; 4815 else if (offset <= fa->fa_end && end >= fa->fa_end) 4816 fa->fa_end = offset - 1; 4817 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4818 /* 4819 * If the "normal" region is a middle 4820 * portion of the existing 4821 * non-standard region, just remove 4822 * the whole thing rather than picking 4823 * one side or the other to 4824 * preserve. 4825 */ 4826 new = fa; 4827 fp->f_advice = NULL; 4828 } 4829 } 4830 mtx_pool_unlock(mtxpool_sleep, fp); 4831 break; 4832 case POSIX_FADV_WILLNEED: 4833 case POSIX_FADV_DONTNEED: 4834 error = VOP_ADVISE(vp, offset, end, advice); 4835 break; 4836 } 4837 out: 4838 if (fp != NULL) 4839 fdrop(fp, td); 4840 free(new, M_FADVISE); 4841 return (error); 4842 } 4843 4844 int 4845 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4846 { 4847 int error; 4848 4849 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4850 uap->advice); 4851 return (kern_posix_error(td, error)); 4852 } 4853 4854 int 4855 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 4856 off_t *outoffp, size_t len, unsigned int flags) 4857 { 4858 struct file *infp, *outfp; 4859 struct vnode *invp, *outvp; 4860 int error; 4861 size_t retlen; 4862 void *rl_rcookie, *rl_wcookie; 4863 off_t savinoff, savoutoff; 4864 4865 infp = outfp = NULL; 4866 rl_rcookie = rl_wcookie = NULL; 4867 savinoff = -1; 4868 error = 0; 4869 retlen = 0; 4870 4871 if (flags != 0) { 4872 error = EINVAL; 4873 goto out; 4874 } 4875 if (len > SSIZE_MAX) 4876 /* 4877 * Although the len argument is size_t, the return argument 4878 * is ssize_t (which is signed). Therefore a size that won't 4879 * fit in ssize_t can't be returned. 4880 */ 4881 len = SSIZE_MAX; 4882 4883 /* Get the file structures for the file descriptors. */ 4884 error = fget_read(td, infd, &cap_read_rights, &infp); 4885 if (error != 0) 4886 goto out; 4887 if (infp->f_ops == &badfileops) { 4888 error = EBADF; 4889 goto out; 4890 } 4891 if (infp->f_vnode == NULL) { 4892 error = EINVAL; 4893 goto out; 4894 } 4895 error = fget_write(td, outfd, &cap_write_rights, &outfp); 4896 if (error != 0) 4897 goto out; 4898 if (outfp->f_ops == &badfileops) { 4899 error = EBADF; 4900 goto out; 4901 } 4902 if (outfp->f_vnode == NULL) { 4903 error = EINVAL; 4904 goto out; 4905 } 4906 4907 /* Set the offset pointers to the correct place. */ 4908 if (inoffp == NULL) 4909 inoffp = &infp->f_offset; 4910 if (outoffp == NULL) 4911 outoffp = &outfp->f_offset; 4912 savinoff = *inoffp; 4913 savoutoff = *outoffp; 4914 4915 invp = infp->f_vnode; 4916 outvp = outfp->f_vnode; 4917 /* Sanity check the f_flag bits. */ 4918 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 4919 (infp->f_flag & FREAD) == 0) { 4920 error = EBADF; 4921 goto out; 4922 } 4923 4924 /* If len == 0, just return 0. */ 4925 if (len == 0) 4926 goto out; 4927 4928 /* 4929 * If infp and outfp refer to the same file, the byte ranges cannot 4930 * overlap. 4931 */ 4932 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len > 4933 savoutoff) || (savinoff > savoutoff && savoutoff + len > 4934 savinoff))) { 4935 error = EINVAL; 4936 goto out; 4937 } 4938 4939 /* Range lock the byte ranges for both invp and outvp. */ 4940 for (;;) { 4941 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp + 4942 len); 4943 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp + 4944 len); 4945 if (rl_rcookie != NULL) 4946 break; 4947 vn_rangelock_unlock(outvp, rl_wcookie); 4948 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len); 4949 vn_rangelock_unlock(invp, rl_rcookie); 4950 } 4951 4952 retlen = len; 4953 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen, 4954 flags, infp->f_cred, outfp->f_cred, td); 4955 out: 4956 if (rl_rcookie != NULL) 4957 vn_rangelock_unlock(invp, rl_rcookie); 4958 if (rl_wcookie != NULL) 4959 vn_rangelock_unlock(outvp, rl_wcookie); 4960 if (savinoff != -1 && (error == EINTR || error == ERESTART)) { 4961 *inoffp = savinoff; 4962 *outoffp = savoutoff; 4963 } 4964 if (outfp != NULL) 4965 fdrop(outfp, td); 4966 if (infp != NULL) 4967 fdrop(infp, td); 4968 td->td_retval[0] = retlen; 4969 return (error); 4970 } 4971 4972 int 4973 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 4974 { 4975 off_t inoff, outoff, *inoffp, *outoffp; 4976 int error; 4977 4978 inoffp = outoffp = NULL; 4979 if (uap->inoffp != NULL) { 4980 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 4981 if (error != 0) 4982 return (error); 4983 inoffp = &inoff; 4984 } 4985 if (uap->outoffp != NULL) { 4986 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 4987 if (error != 0) 4988 return (error); 4989 outoffp = &outoff; 4990 } 4991 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 4992 outoffp, uap->len, uap->flags); 4993 if (error == 0 && uap->inoffp != NULL) 4994 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 4995 if (error == 0 && uap->outoffp != NULL) 4996 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 4997 return (error); 4998 }
Cache object: 640354bfbf8ffbbd6a57e8dabbe3efeb
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