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 <ufs/ufs/quota.h> 91 92 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 93 94 SDT_PROVIDER_DEFINE(vfs); 95 SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int"); 96 SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int"); 97 98 static int kern_chflagsat(struct thread *td, int fd, const char *path, 99 enum uio_seg pathseg, u_long flags, int atflag); 100 static int setfflags(struct thread *td, struct vnode *, u_long); 101 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 102 static int getutimens(const struct timespec *, enum uio_seg, 103 struct timespec *, int *); 104 static int setutimes(struct thread *td, struct vnode *, 105 const struct timespec *, int, int); 106 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 107 struct thread *td); 108 static int kern_fhlinkat(struct thread *td, int fd, const char *path, 109 enum uio_seg pathseg, fhandle_t *fhp); 110 static int kern_getfhat(struct thread *td, int flags, int fd, 111 const char *path, enum uio_seg pathseg, fhandle_t *fhp); 112 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, 113 size_t count, struct thread *td); 114 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, 115 const char *path, enum uio_seg segflag); 116 117 int 118 kern_sync(struct thread *td) 119 { 120 struct mount *mp, *nmp; 121 int save; 122 123 mtx_lock(&mountlist_mtx); 124 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 125 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 126 nmp = TAILQ_NEXT(mp, mnt_list); 127 continue; 128 } 129 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 130 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 131 save = curthread_pflags_set(TDP_SYNCIO); 132 vfs_periodic(mp, MNT_NOWAIT); 133 VFS_SYNC(mp, MNT_NOWAIT); 134 curthread_pflags_restore(save); 135 vn_finished_write(mp); 136 } 137 mtx_lock(&mountlist_mtx); 138 nmp = TAILQ_NEXT(mp, mnt_list); 139 vfs_unbusy(mp); 140 } 141 mtx_unlock(&mountlist_mtx); 142 return (0); 143 } 144 145 /* 146 * Sync each mounted filesystem. 147 */ 148 #ifndef _SYS_SYSPROTO_H_ 149 struct sync_args { 150 int dummy; 151 }; 152 #endif 153 /* ARGSUSED */ 154 int 155 sys_sync(struct thread *td, struct sync_args *uap) 156 { 157 158 return (kern_sync(td)); 159 } 160 161 /* 162 * Change filesystem quotas. 163 */ 164 #ifndef _SYS_SYSPROTO_H_ 165 struct quotactl_args { 166 char *path; 167 int cmd; 168 int uid; 169 caddr_t arg; 170 }; 171 #endif 172 int 173 sys_quotactl(struct thread *td, struct quotactl_args *uap) 174 { 175 struct mount *mp; 176 struct nameidata nd; 177 int error; 178 179 AUDIT_ARG_CMD(uap->cmd); 180 AUDIT_ARG_UID(uap->uid); 181 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 182 return (EPERM); 183 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 184 uap->path, td); 185 if ((error = namei(&nd)) != 0) 186 return (error); 187 NDFREE(&nd, NDF_ONLY_PNBUF); 188 mp = nd.ni_vp->v_mount; 189 vfs_ref(mp); 190 vput(nd.ni_vp); 191 error = vfs_busy(mp, 0); 192 vfs_rel(mp); 193 if (error != 0) 194 return (error); 195 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); 196 197 /* 198 * Since quota on operation typically needs to open quota 199 * file, the Q_QUOTAON handler needs to unbusy the mount point 200 * before calling into namei. Otherwise, unmount might be 201 * started between two vfs_busy() invocations (first is our, 202 * second is from mount point cross-walk code in lookup()), 203 * causing deadlock. 204 * 205 * Require that Q_QUOTAON handles the vfs_busy() reference on 206 * its own, always returning with ubusied mount point. 207 */ 208 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON && 209 (uap->cmd >> SUBCMDSHIFT) != Q_QUOTAOFF) 210 vfs_unbusy(mp); 211 return (error); 212 } 213 214 /* 215 * Used by statfs conversion routines to scale the block size up if 216 * necessary so that all of the block counts are <= 'max_size'. Note 217 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 218 * value of 'n'. 219 */ 220 void 221 statfs_scale_blocks(struct statfs *sf, long max_size) 222 { 223 uint64_t count; 224 int shift; 225 226 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 227 228 /* 229 * Attempt to scale the block counts to give a more accurate 230 * overview to userland of the ratio of free space to used 231 * space. To do this, find the largest block count and compute 232 * a divisor that lets it fit into a signed integer <= max_size. 233 */ 234 if (sf->f_bavail < 0) 235 count = -sf->f_bavail; 236 else 237 count = sf->f_bavail; 238 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 239 if (count <= max_size) 240 return; 241 242 count >>= flsl(max_size); 243 shift = 0; 244 while (count > 0) { 245 shift++; 246 count >>=1; 247 } 248 249 sf->f_bsize <<= shift; 250 sf->f_blocks >>= shift; 251 sf->f_bfree >>= shift; 252 sf->f_bavail >>= shift; 253 } 254 255 static int 256 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 257 { 258 int error; 259 260 if (mp == NULL) 261 return (EBADF); 262 error = vfs_busy(mp, 0); 263 vfs_rel(mp); 264 if (error != 0) 265 return (error); 266 #ifdef MAC 267 error = mac_mount_check_stat(td->td_ucred, mp); 268 if (error != 0) 269 goto out; 270 #endif 271 error = VFS_STATFS(mp, buf); 272 if (error != 0) 273 goto out; 274 if (priv_check(td, PRIV_VFS_GENERATION)) { 275 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 276 prison_enforce_statfs(td->td_ucred, mp, buf); 277 } 278 out: 279 vfs_unbusy(mp); 280 return (error); 281 } 282 283 /* 284 * Get filesystem statistics. 285 */ 286 #ifndef _SYS_SYSPROTO_H_ 287 struct statfs_args { 288 char *path; 289 struct statfs *buf; 290 }; 291 #endif 292 int 293 sys_statfs(struct thread *td, struct statfs_args *uap) 294 { 295 struct statfs *sfp; 296 int error; 297 298 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 299 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 300 if (error == 0) 301 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 302 free(sfp, M_STATFS); 303 return (error); 304 } 305 306 int 307 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg, 308 struct statfs *buf) 309 { 310 struct mount *mp; 311 struct nameidata nd; 312 int error; 313 314 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 315 pathseg, path, td); 316 error = namei(&nd); 317 if (error != 0) 318 return (error); 319 mp = nd.ni_vp->v_mount; 320 vfs_ref(mp); 321 NDFREE(&nd, NDF_ONLY_PNBUF); 322 vput(nd.ni_vp); 323 return (kern_do_statfs(td, mp, buf)); 324 } 325 326 /* 327 * Get filesystem statistics. 328 */ 329 #ifndef _SYS_SYSPROTO_H_ 330 struct fstatfs_args { 331 int fd; 332 struct statfs *buf; 333 }; 334 #endif 335 int 336 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 337 { 338 struct statfs *sfp; 339 int error; 340 341 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 342 error = kern_fstatfs(td, uap->fd, sfp); 343 if (error == 0) 344 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 345 free(sfp, M_STATFS); 346 return (error); 347 } 348 349 int 350 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 351 { 352 struct file *fp; 353 struct mount *mp; 354 struct vnode *vp; 355 int error; 356 357 AUDIT_ARG_FD(fd); 358 error = getvnode(td, fd, &cap_fstatfs_rights, &fp); 359 if (error != 0) 360 return (error); 361 vp = fp->f_vnode; 362 vn_lock(vp, LK_SHARED | LK_RETRY); 363 #ifdef AUDIT 364 AUDIT_ARG_VNODE1(vp); 365 #endif 366 mp = vp->v_mount; 367 if (mp != NULL) 368 vfs_ref(mp); 369 VOP_UNLOCK(vp); 370 fdrop(fp, td); 371 return (kern_do_statfs(td, mp, buf)); 372 } 373 374 /* 375 * Get statistics on all filesystems. 376 */ 377 #ifndef _SYS_SYSPROTO_H_ 378 struct getfsstat_args { 379 struct statfs *buf; 380 long bufsize; 381 int mode; 382 }; 383 #endif 384 int 385 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 386 { 387 size_t count; 388 int error; 389 390 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 391 return (EINVAL); 392 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 393 UIO_USERSPACE, uap->mode); 394 if (error == 0) 395 td->td_retval[0] = count; 396 return (error); 397 } 398 399 /* 400 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 401 * The caller is responsible for freeing memory which will be allocated 402 * in '*buf'. 403 */ 404 int 405 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 406 size_t *countp, enum uio_seg bufseg, int mode) 407 { 408 struct mount *mp, *nmp; 409 struct statfs *sfsp, *sp, *sptmp, *tofree; 410 size_t count, maxcount; 411 int error; 412 413 switch (mode) { 414 case MNT_WAIT: 415 case MNT_NOWAIT: 416 break; 417 default: 418 if (bufseg == UIO_SYSSPACE) 419 *buf = NULL; 420 return (EINVAL); 421 } 422 restart: 423 maxcount = bufsize / sizeof(struct statfs); 424 if (bufsize == 0) { 425 sfsp = NULL; 426 tofree = NULL; 427 } else if (bufseg == UIO_USERSPACE) { 428 sfsp = *buf; 429 tofree = NULL; 430 } else /* if (bufseg == UIO_SYSSPACE) */ { 431 count = 0; 432 mtx_lock(&mountlist_mtx); 433 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 434 count++; 435 } 436 mtx_unlock(&mountlist_mtx); 437 if (maxcount > count) 438 maxcount = count; 439 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 440 M_STATFS, M_WAITOK); 441 } 442 count = 0; 443 mtx_lock(&mountlist_mtx); 444 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 445 if (prison_canseemount(td->td_ucred, mp) != 0) { 446 nmp = TAILQ_NEXT(mp, mnt_list); 447 continue; 448 } 449 #ifdef MAC 450 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 451 nmp = TAILQ_NEXT(mp, mnt_list); 452 continue; 453 } 454 #endif 455 if (mode == MNT_WAIT) { 456 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 457 /* 458 * If vfs_busy() failed, and MBF_NOWAIT 459 * wasn't passed, then the mp is gone. 460 * Furthermore, because of MBF_MNTLSTLOCK, 461 * the mountlist_mtx was dropped. We have 462 * no other choice than to start over. 463 */ 464 mtx_unlock(&mountlist_mtx); 465 free(tofree, M_STATFS); 466 goto restart; 467 } 468 } else { 469 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 470 nmp = TAILQ_NEXT(mp, mnt_list); 471 continue; 472 } 473 } 474 if (sfsp != NULL && count < maxcount) { 475 sp = &mp->mnt_stat; 476 /* 477 * If MNT_NOWAIT is specified, do not refresh 478 * the fsstat cache. 479 */ 480 if (mode != MNT_NOWAIT) { 481 error = VFS_STATFS(mp, sp); 482 if (error != 0) { 483 mtx_lock(&mountlist_mtx); 484 nmp = TAILQ_NEXT(mp, mnt_list); 485 vfs_unbusy(mp); 486 continue; 487 } 488 } 489 if (priv_check(td, PRIV_VFS_GENERATION)) { 490 sptmp = malloc(sizeof(struct statfs), M_STATFS, 491 M_WAITOK); 492 *sptmp = *sp; 493 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 494 prison_enforce_statfs(td->td_ucred, mp, sptmp); 495 sp = sptmp; 496 } else 497 sptmp = NULL; 498 if (bufseg == UIO_SYSSPACE) { 499 bcopy(sp, sfsp, sizeof(*sp)); 500 free(sptmp, M_STATFS); 501 } else /* if (bufseg == UIO_USERSPACE) */ { 502 error = copyout(sp, sfsp, sizeof(*sp)); 503 free(sptmp, M_STATFS); 504 if (error != 0) { 505 vfs_unbusy(mp); 506 return (error); 507 } 508 } 509 sfsp++; 510 } 511 count++; 512 mtx_lock(&mountlist_mtx); 513 nmp = TAILQ_NEXT(mp, mnt_list); 514 vfs_unbusy(mp); 515 } 516 mtx_unlock(&mountlist_mtx); 517 if (sfsp != NULL && count > maxcount) 518 *countp = maxcount; 519 else 520 *countp = count; 521 return (0); 522 } 523 524 #ifdef COMPAT_FREEBSD4 525 /* 526 * Get old format filesystem statistics. 527 */ 528 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 529 530 #ifndef _SYS_SYSPROTO_H_ 531 struct freebsd4_statfs_args { 532 char *path; 533 struct ostatfs *buf; 534 }; 535 #endif 536 int 537 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 538 { 539 struct ostatfs osb; 540 struct statfs *sfp; 541 int error; 542 543 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 544 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 545 if (error == 0) { 546 freebsd4_cvtstatfs(sfp, &osb); 547 error = copyout(&osb, uap->buf, sizeof(osb)); 548 } 549 free(sfp, M_STATFS); 550 return (error); 551 } 552 553 /* 554 * Get filesystem statistics. 555 */ 556 #ifndef _SYS_SYSPROTO_H_ 557 struct freebsd4_fstatfs_args { 558 int fd; 559 struct ostatfs *buf; 560 }; 561 #endif 562 int 563 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 564 { 565 struct ostatfs osb; 566 struct statfs *sfp; 567 int error; 568 569 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 570 error = kern_fstatfs(td, uap->fd, sfp); 571 if (error == 0) { 572 freebsd4_cvtstatfs(sfp, &osb); 573 error = copyout(&osb, uap->buf, sizeof(osb)); 574 } 575 free(sfp, M_STATFS); 576 return (error); 577 } 578 579 /* 580 * Get statistics on all filesystems. 581 */ 582 #ifndef _SYS_SYSPROTO_H_ 583 struct freebsd4_getfsstat_args { 584 struct ostatfs *buf; 585 long bufsize; 586 int mode; 587 }; 588 #endif 589 int 590 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 591 { 592 struct statfs *buf, *sp; 593 struct ostatfs osb; 594 size_t count, size; 595 int error; 596 597 if (uap->bufsize < 0) 598 return (EINVAL); 599 count = uap->bufsize / sizeof(struct ostatfs); 600 if (count > SIZE_MAX / sizeof(struct statfs)) 601 return (EINVAL); 602 size = count * sizeof(struct statfs); 603 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 604 uap->mode); 605 if (error == 0) 606 td->td_retval[0] = count; 607 if (size != 0) { 608 sp = buf; 609 while (count != 0 && error == 0) { 610 freebsd4_cvtstatfs(sp, &osb); 611 error = copyout(&osb, uap->buf, sizeof(osb)); 612 sp++; 613 uap->buf++; 614 count--; 615 } 616 free(buf, M_STATFS); 617 } 618 return (error); 619 } 620 621 /* 622 * Implement fstatfs() for (NFS) file handles. 623 */ 624 #ifndef _SYS_SYSPROTO_H_ 625 struct freebsd4_fhstatfs_args { 626 struct fhandle *u_fhp; 627 struct ostatfs *buf; 628 }; 629 #endif 630 int 631 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 632 { 633 struct ostatfs osb; 634 struct statfs *sfp; 635 fhandle_t fh; 636 int error; 637 638 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 639 if (error != 0) 640 return (error); 641 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 642 error = kern_fhstatfs(td, fh, sfp); 643 if (error == 0) { 644 freebsd4_cvtstatfs(sfp, &osb); 645 error = copyout(&osb, uap->buf, sizeof(osb)); 646 } 647 free(sfp, M_STATFS); 648 return (error); 649 } 650 651 /* 652 * Convert a new format statfs structure to an old format statfs structure. 653 */ 654 static void 655 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 656 { 657 658 statfs_scale_blocks(nsp, LONG_MAX); 659 bzero(osp, sizeof(*osp)); 660 osp->f_bsize = nsp->f_bsize; 661 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 662 osp->f_blocks = nsp->f_blocks; 663 osp->f_bfree = nsp->f_bfree; 664 osp->f_bavail = nsp->f_bavail; 665 osp->f_files = MIN(nsp->f_files, LONG_MAX); 666 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 667 osp->f_owner = nsp->f_owner; 668 osp->f_type = nsp->f_type; 669 osp->f_flags = nsp->f_flags; 670 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 671 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 672 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 673 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 674 strlcpy(osp->f_fstypename, nsp->f_fstypename, 675 MIN(MFSNAMELEN, OMFSNAMELEN)); 676 strlcpy(osp->f_mntonname, nsp->f_mntonname, 677 MIN(MNAMELEN, OMNAMELEN)); 678 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 679 MIN(MNAMELEN, OMNAMELEN)); 680 osp->f_fsid = nsp->f_fsid; 681 } 682 #endif /* COMPAT_FREEBSD4 */ 683 684 #if defined(COMPAT_FREEBSD11) 685 /* 686 * Get old format filesystem statistics. 687 */ 688 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 689 690 int 691 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 692 { 693 struct freebsd11_statfs osb; 694 struct statfs *sfp; 695 int error; 696 697 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 698 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 699 if (error == 0) { 700 freebsd11_cvtstatfs(sfp, &osb); 701 error = copyout(&osb, uap->buf, sizeof(osb)); 702 } 703 free(sfp, M_STATFS); 704 return (error); 705 } 706 707 /* 708 * Get filesystem statistics. 709 */ 710 int 711 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 712 { 713 struct freebsd11_statfs osb; 714 struct statfs *sfp; 715 int error; 716 717 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 718 error = kern_fstatfs(td, uap->fd, sfp); 719 if (error == 0) { 720 freebsd11_cvtstatfs(sfp, &osb); 721 error = copyout(&osb, uap->buf, sizeof(osb)); 722 } 723 free(sfp, M_STATFS); 724 return (error); 725 } 726 727 /* 728 * Get statistics on all filesystems. 729 */ 730 int 731 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 732 { 733 struct freebsd11_statfs osb; 734 struct statfs *buf, *sp; 735 size_t count, size; 736 int error; 737 738 count = uap->bufsize / sizeof(struct ostatfs); 739 size = count * sizeof(struct statfs); 740 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 741 uap->mode); 742 if (error == 0) 743 td->td_retval[0] = count; 744 if (size > 0) { 745 sp = buf; 746 while (count > 0 && error == 0) { 747 freebsd11_cvtstatfs(sp, &osb); 748 error = copyout(&osb, uap->buf, sizeof(osb)); 749 sp++; 750 uap->buf++; 751 count--; 752 } 753 free(buf, M_STATFS); 754 } 755 return (error); 756 } 757 758 /* 759 * Implement fstatfs() for (NFS) file handles. 760 */ 761 int 762 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 763 { 764 struct freebsd11_statfs osb; 765 struct statfs *sfp; 766 fhandle_t fh; 767 int error; 768 769 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 770 if (error) 771 return (error); 772 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 773 error = kern_fhstatfs(td, fh, sfp); 774 if (error == 0) { 775 freebsd11_cvtstatfs(sfp, &osb); 776 error = copyout(&osb, uap->buf, sizeof(osb)); 777 } 778 free(sfp, M_STATFS); 779 return (error); 780 } 781 782 /* 783 * Convert a new format statfs structure to an old format statfs structure. 784 */ 785 static void 786 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 787 { 788 789 bzero(osp, sizeof(*osp)); 790 osp->f_version = FREEBSD11_STATFS_VERSION; 791 osp->f_type = nsp->f_type; 792 osp->f_flags = nsp->f_flags; 793 osp->f_bsize = nsp->f_bsize; 794 osp->f_iosize = nsp->f_iosize; 795 osp->f_blocks = nsp->f_blocks; 796 osp->f_bfree = nsp->f_bfree; 797 osp->f_bavail = nsp->f_bavail; 798 osp->f_files = nsp->f_files; 799 osp->f_ffree = nsp->f_ffree; 800 osp->f_syncwrites = nsp->f_syncwrites; 801 osp->f_asyncwrites = nsp->f_asyncwrites; 802 osp->f_syncreads = nsp->f_syncreads; 803 osp->f_asyncreads = nsp->f_asyncreads; 804 osp->f_namemax = nsp->f_namemax; 805 osp->f_owner = nsp->f_owner; 806 osp->f_fsid = nsp->f_fsid; 807 strlcpy(osp->f_fstypename, nsp->f_fstypename, 808 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 809 strlcpy(osp->f_mntonname, nsp->f_mntonname, 810 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 811 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 812 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 813 } 814 #endif /* COMPAT_FREEBSD11 */ 815 816 /* 817 * Change current working directory to a given file descriptor. 818 */ 819 #ifndef _SYS_SYSPROTO_H_ 820 struct fchdir_args { 821 int fd; 822 }; 823 #endif 824 int 825 sys_fchdir(struct thread *td, struct fchdir_args *uap) 826 { 827 struct vnode *vp, *tdp; 828 struct mount *mp; 829 struct file *fp; 830 int error; 831 832 AUDIT_ARG_FD(uap->fd); 833 error = getvnode(td, uap->fd, &cap_fchdir_rights, 834 &fp); 835 if (error != 0) 836 return (error); 837 vp = fp->f_vnode; 838 vrefact(vp); 839 fdrop(fp, td); 840 vn_lock(vp, LK_SHARED | LK_RETRY); 841 AUDIT_ARG_VNODE1(vp); 842 error = change_dir(vp, td); 843 while (!error && (mp = vp->v_mountedhere) != NULL) { 844 if (vfs_busy(mp, 0)) 845 continue; 846 error = VFS_ROOT(mp, LK_SHARED, &tdp); 847 vfs_unbusy(mp); 848 if (error != 0) 849 break; 850 vput(vp); 851 vp = tdp; 852 } 853 if (error != 0) { 854 vput(vp); 855 return (error); 856 } 857 VOP_UNLOCK(vp); 858 pwd_chdir(td, vp); 859 return (0); 860 } 861 862 /* 863 * Change current working directory (``.''). 864 */ 865 #ifndef _SYS_SYSPROTO_H_ 866 struct chdir_args { 867 char *path; 868 }; 869 #endif 870 int 871 sys_chdir(struct thread *td, struct chdir_args *uap) 872 { 873 874 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 875 } 876 877 int 878 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg) 879 { 880 struct nameidata nd; 881 int error; 882 883 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 884 pathseg, path, td); 885 if ((error = namei(&nd)) != 0) 886 return (error); 887 if ((error = change_dir(nd.ni_vp, td)) != 0) { 888 vput(nd.ni_vp); 889 NDFREE(&nd, NDF_ONLY_PNBUF); 890 return (error); 891 } 892 VOP_UNLOCK(nd.ni_vp); 893 NDFREE(&nd, NDF_ONLY_PNBUF); 894 pwd_chdir(td, nd.ni_vp); 895 return (0); 896 } 897 898 /* 899 * Change notion of root (``/'') directory. 900 */ 901 #ifndef _SYS_SYSPROTO_H_ 902 struct chroot_args { 903 char *path; 904 }; 905 #endif 906 int 907 sys_chroot(struct thread *td, struct chroot_args *uap) 908 { 909 struct nameidata nd; 910 int error; 911 912 error = priv_check(td, PRIV_VFS_CHROOT); 913 if (error != 0) 914 return (error); 915 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 916 UIO_USERSPACE, uap->path, td); 917 error = namei(&nd); 918 if (error != 0) 919 goto error; 920 error = change_dir(nd.ni_vp, td); 921 if (error != 0) 922 goto e_vunlock; 923 #ifdef MAC 924 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 925 if (error != 0) 926 goto e_vunlock; 927 #endif 928 VOP_UNLOCK(nd.ni_vp); 929 error = pwd_chroot(td, nd.ni_vp); 930 vrele(nd.ni_vp); 931 NDFREE(&nd, NDF_ONLY_PNBUF); 932 return (error); 933 e_vunlock: 934 vput(nd.ni_vp); 935 error: 936 NDFREE(&nd, NDF_ONLY_PNBUF); 937 return (error); 938 } 939 940 /* 941 * Common routine for chroot and chdir. Callers must provide a locked vnode 942 * instance. 943 */ 944 int 945 change_dir(struct vnode *vp, struct thread *td) 946 { 947 #ifdef MAC 948 int error; 949 #endif 950 951 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 952 if (vp->v_type != VDIR) 953 return (ENOTDIR); 954 #ifdef MAC 955 error = mac_vnode_check_chdir(td->td_ucred, vp); 956 if (error != 0) 957 return (error); 958 #endif 959 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 960 } 961 962 static __inline void 963 flags_to_rights(int flags, cap_rights_t *rightsp) 964 { 965 966 if (flags & O_EXEC) { 967 cap_rights_set(rightsp, CAP_FEXECVE); 968 } else { 969 switch ((flags & O_ACCMODE)) { 970 case O_RDONLY: 971 cap_rights_set(rightsp, CAP_READ); 972 break; 973 case O_RDWR: 974 cap_rights_set(rightsp, CAP_READ); 975 /* FALLTHROUGH */ 976 case O_WRONLY: 977 cap_rights_set(rightsp, CAP_WRITE); 978 if (!(flags & (O_APPEND | O_TRUNC))) 979 cap_rights_set(rightsp, CAP_SEEK); 980 break; 981 } 982 } 983 984 if (flags & O_CREAT) 985 cap_rights_set(rightsp, CAP_CREATE); 986 987 if (flags & O_TRUNC) 988 cap_rights_set(rightsp, CAP_FTRUNCATE); 989 990 if (flags & (O_SYNC | O_FSYNC)) 991 cap_rights_set(rightsp, CAP_FSYNC); 992 993 if (flags & (O_EXLOCK | O_SHLOCK)) 994 cap_rights_set(rightsp, CAP_FLOCK); 995 } 996 997 /* 998 * Check permissions, allocate an open file structure, and call the device 999 * open routine if any. 1000 */ 1001 #ifndef _SYS_SYSPROTO_H_ 1002 struct open_args { 1003 char *path; 1004 int flags; 1005 int mode; 1006 }; 1007 #endif 1008 int 1009 sys_open(struct thread *td, struct open_args *uap) 1010 { 1011 1012 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1013 uap->flags, uap->mode)); 1014 } 1015 1016 #ifndef _SYS_SYSPROTO_H_ 1017 struct openat_args { 1018 int fd; 1019 char *path; 1020 int flag; 1021 int mode; 1022 }; 1023 #endif 1024 int 1025 sys_openat(struct thread *td, struct openat_args *uap) 1026 { 1027 1028 AUDIT_ARG_FD(uap->fd); 1029 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1030 uap->mode)); 1031 } 1032 1033 int 1034 kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1035 int flags, int mode) 1036 { 1037 struct proc *p = td->td_proc; 1038 struct filedesc *fdp = p->p_fd; 1039 struct file *fp; 1040 struct vnode *vp; 1041 struct nameidata nd; 1042 cap_rights_t rights; 1043 int cmode, error, indx; 1044 1045 indx = -1; 1046 1047 AUDIT_ARG_FFLAGS(flags); 1048 AUDIT_ARG_MODE(mode); 1049 cap_rights_init(&rights, CAP_LOOKUP); 1050 flags_to_rights(flags, &rights); 1051 /* 1052 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1053 * may be specified. 1054 */ 1055 if (flags & O_EXEC) { 1056 if (flags & O_ACCMODE) 1057 return (EINVAL); 1058 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1059 return (EINVAL); 1060 } else { 1061 flags = FFLAGS(flags); 1062 } 1063 1064 /* 1065 * Allocate a file structure. The descriptor to reference it 1066 * is allocated and set by finstall() below. 1067 */ 1068 error = falloc_noinstall(td, &fp); 1069 if (error != 0) 1070 return (error); 1071 /* 1072 * An extra reference on `fp' has been held for us by 1073 * falloc_noinstall(). 1074 */ 1075 /* Set the flags early so the finit in devfs can pick them up. */ 1076 fp->f_flag = flags & FMASK; 1077 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; 1078 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1079 &rights, td); 1080 td->td_dupfd = -1; /* XXX check for fdopen */ 1081 error = vn_open(&nd, &flags, cmode, fp); 1082 if (error != 0) { 1083 /* 1084 * If the vn_open replaced the method vector, something 1085 * wonderous happened deep below and we just pass it up 1086 * pretending we know what we do. 1087 */ 1088 if (error == ENXIO && fp->f_ops != &badfileops) 1089 goto success; 1090 1091 /* 1092 * Handle special fdopen() case. bleh. 1093 * 1094 * Don't do this for relative (capability) lookups; we don't 1095 * understand exactly what would happen, and we don't think 1096 * that it ever should. 1097 */ 1098 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 && 1099 (error == ENODEV || error == ENXIO) && 1100 td->td_dupfd >= 0) { 1101 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1102 &indx); 1103 if (error == 0) 1104 goto success; 1105 } 1106 1107 goto bad; 1108 } 1109 td->td_dupfd = 0; 1110 NDFREE(&nd, NDF_ONLY_PNBUF); 1111 vp = nd.ni_vp; 1112 1113 /* 1114 * Store the vnode, for any f_type. Typically, the vnode use 1115 * count is decremented by direct call to vn_closefile() for 1116 * files that switched type in the cdevsw fdopen() method. 1117 */ 1118 fp->f_vnode = vp; 1119 /* 1120 * If the file wasn't claimed by devfs bind it to the normal 1121 * vnode operations here. 1122 */ 1123 if (fp->f_ops == &badfileops) { 1124 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); 1125 fp->f_seqcount = 1; 1126 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK), 1127 DTYPE_VNODE, vp, &vnops); 1128 } 1129 1130 VOP_UNLOCK(vp); 1131 if (flags & O_TRUNC) { 1132 error = fo_truncate(fp, 0, td->td_ucred, td); 1133 if (error != 0) 1134 goto bad; 1135 } 1136 success: 1137 /* 1138 * If we haven't already installed the FD (for dupfdopen), do so now. 1139 */ 1140 if (indx == -1) { 1141 struct filecaps *fcaps; 1142 1143 #ifdef CAPABILITIES 1144 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0) 1145 fcaps = &nd.ni_filecaps; 1146 else 1147 #endif 1148 fcaps = NULL; 1149 error = finstall(td, fp, &indx, flags, fcaps); 1150 /* On success finstall() consumes fcaps. */ 1151 if (error != 0) { 1152 filecaps_free(&nd.ni_filecaps); 1153 goto bad; 1154 } 1155 } else { 1156 filecaps_free(&nd.ni_filecaps); 1157 } 1158 1159 /* 1160 * Release our private reference, leaving the one associated with 1161 * the descriptor table intact. 1162 */ 1163 fdrop(fp, td); 1164 td->td_retval[0] = indx; 1165 return (0); 1166 bad: 1167 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1168 fdrop(fp, td); 1169 return (error); 1170 } 1171 1172 #ifdef COMPAT_43 1173 /* 1174 * Create a file. 1175 */ 1176 #ifndef _SYS_SYSPROTO_H_ 1177 struct ocreat_args { 1178 char *path; 1179 int mode; 1180 }; 1181 #endif 1182 int 1183 ocreat(struct thread *td, struct ocreat_args *uap) 1184 { 1185 1186 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1187 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1188 } 1189 #endif /* COMPAT_43 */ 1190 1191 /* 1192 * Create a special file. 1193 */ 1194 #ifndef _SYS_SYSPROTO_H_ 1195 struct mknodat_args { 1196 int fd; 1197 char *path; 1198 mode_t mode; 1199 dev_t dev; 1200 }; 1201 #endif 1202 int 1203 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1204 { 1205 1206 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1207 uap->dev)); 1208 } 1209 1210 #if defined(COMPAT_FREEBSD11) 1211 int 1212 freebsd11_mknod(struct thread *td, 1213 struct freebsd11_mknod_args *uap) 1214 { 1215 1216 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1217 uap->mode, uap->dev)); 1218 } 1219 1220 int 1221 freebsd11_mknodat(struct thread *td, 1222 struct freebsd11_mknodat_args *uap) 1223 { 1224 1225 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1226 uap->dev)); 1227 } 1228 #endif /* COMPAT_FREEBSD11 */ 1229 1230 int 1231 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1232 int mode, dev_t dev) 1233 { 1234 struct vnode *vp; 1235 struct mount *mp; 1236 struct vattr vattr; 1237 struct nameidata nd; 1238 int error, whiteout = 0; 1239 1240 AUDIT_ARG_MODE(mode); 1241 AUDIT_ARG_DEV(dev); 1242 switch (mode & S_IFMT) { 1243 case S_IFCHR: 1244 case S_IFBLK: 1245 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1246 if (error == 0 && dev == VNOVAL) 1247 error = EINVAL; 1248 break; 1249 case S_IFWHT: 1250 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1251 break; 1252 case S_IFIFO: 1253 if (dev == 0) 1254 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1255 /* FALLTHROUGH */ 1256 default: 1257 error = EINVAL; 1258 break; 1259 } 1260 if (error != 0) 1261 return (error); 1262 restart: 1263 bwillwrite(); 1264 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1265 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1266 td); 1267 if ((error = namei(&nd)) != 0) 1268 return (error); 1269 vp = nd.ni_vp; 1270 if (vp != NULL) { 1271 NDFREE(&nd, NDF_ONLY_PNBUF); 1272 if (vp == nd.ni_dvp) 1273 vrele(nd.ni_dvp); 1274 else 1275 vput(nd.ni_dvp); 1276 vrele(vp); 1277 return (EEXIST); 1278 } else { 1279 VATTR_NULL(&vattr); 1280 vattr.va_mode = (mode & ALLPERMS) & 1281 ~td->td_proc->p_fd->fd_cmask; 1282 vattr.va_rdev = dev; 1283 whiteout = 0; 1284 1285 switch (mode & S_IFMT) { 1286 case S_IFCHR: 1287 vattr.va_type = VCHR; 1288 break; 1289 case S_IFBLK: 1290 vattr.va_type = VBLK; 1291 break; 1292 case S_IFWHT: 1293 whiteout = 1; 1294 break; 1295 default: 1296 panic("kern_mknod: invalid mode"); 1297 } 1298 } 1299 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1300 NDFREE(&nd, NDF_ONLY_PNBUF); 1301 vput(nd.ni_dvp); 1302 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1303 return (error); 1304 goto restart; 1305 } 1306 #ifdef MAC 1307 if (error == 0 && !whiteout) 1308 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1309 &nd.ni_cnd, &vattr); 1310 #endif 1311 if (error == 0) { 1312 if (whiteout) 1313 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1314 else { 1315 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1316 &nd.ni_cnd, &vattr); 1317 if (error == 0) 1318 vput(nd.ni_vp); 1319 } 1320 } 1321 NDFREE(&nd, NDF_ONLY_PNBUF); 1322 vput(nd.ni_dvp); 1323 vn_finished_write(mp); 1324 return (error); 1325 } 1326 1327 /* 1328 * Create a named pipe. 1329 */ 1330 #ifndef _SYS_SYSPROTO_H_ 1331 struct mkfifo_args { 1332 char *path; 1333 int mode; 1334 }; 1335 #endif 1336 int 1337 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1338 { 1339 1340 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1341 uap->mode)); 1342 } 1343 1344 #ifndef _SYS_SYSPROTO_H_ 1345 struct mkfifoat_args { 1346 int fd; 1347 char *path; 1348 mode_t mode; 1349 }; 1350 #endif 1351 int 1352 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1353 { 1354 1355 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1356 uap->mode)); 1357 } 1358 1359 int 1360 kern_mkfifoat(struct thread *td, int fd, const char *path, 1361 enum uio_seg pathseg, int mode) 1362 { 1363 struct mount *mp; 1364 struct vattr vattr; 1365 struct nameidata nd; 1366 int error; 1367 1368 AUDIT_ARG_MODE(mode); 1369 restart: 1370 bwillwrite(); 1371 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1372 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1373 td); 1374 if ((error = namei(&nd)) != 0) 1375 return (error); 1376 if (nd.ni_vp != NULL) { 1377 NDFREE(&nd, NDF_ONLY_PNBUF); 1378 if (nd.ni_vp == nd.ni_dvp) 1379 vrele(nd.ni_dvp); 1380 else 1381 vput(nd.ni_dvp); 1382 vrele(nd.ni_vp); 1383 return (EEXIST); 1384 } 1385 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1386 NDFREE(&nd, NDF_ONLY_PNBUF); 1387 vput(nd.ni_dvp); 1388 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1389 return (error); 1390 goto restart; 1391 } 1392 VATTR_NULL(&vattr); 1393 vattr.va_type = VFIFO; 1394 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1395 #ifdef MAC 1396 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1397 &vattr); 1398 if (error != 0) 1399 goto out; 1400 #endif 1401 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1402 if (error == 0) 1403 vput(nd.ni_vp); 1404 #ifdef MAC 1405 out: 1406 #endif 1407 vput(nd.ni_dvp); 1408 vn_finished_write(mp); 1409 NDFREE(&nd, NDF_ONLY_PNBUF); 1410 return (error); 1411 } 1412 1413 /* 1414 * Make a hard file link. 1415 */ 1416 #ifndef _SYS_SYSPROTO_H_ 1417 struct link_args { 1418 char *path; 1419 char *link; 1420 }; 1421 #endif 1422 int 1423 sys_link(struct thread *td, struct link_args *uap) 1424 { 1425 1426 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1427 UIO_USERSPACE, FOLLOW)); 1428 } 1429 1430 #ifndef _SYS_SYSPROTO_H_ 1431 struct linkat_args { 1432 int fd1; 1433 char *path1; 1434 int fd2; 1435 char *path2; 1436 int flag; 1437 }; 1438 #endif 1439 int 1440 sys_linkat(struct thread *td, struct linkat_args *uap) 1441 { 1442 int flag; 1443 1444 flag = uap->flag; 1445 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_BENEATH)) != 0) 1446 return (EINVAL); 1447 1448 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1449 UIO_USERSPACE, ((flag & AT_SYMLINK_FOLLOW) != 0 ? FOLLOW : 1450 NOFOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0))); 1451 } 1452 1453 int hardlink_check_uid = 0; 1454 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1455 &hardlink_check_uid, 0, 1456 "Unprivileged processes cannot create hard links to files owned by other " 1457 "users"); 1458 static int hardlink_check_gid = 0; 1459 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1460 &hardlink_check_gid, 0, 1461 "Unprivileged processes cannot create hard links to files owned by other " 1462 "groups"); 1463 1464 static int 1465 can_hardlink(struct vnode *vp, struct ucred *cred) 1466 { 1467 struct vattr va; 1468 int error; 1469 1470 if (!hardlink_check_uid && !hardlink_check_gid) 1471 return (0); 1472 1473 error = VOP_GETATTR(vp, &va, cred); 1474 if (error != 0) 1475 return (error); 1476 1477 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1478 error = priv_check_cred(cred, PRIV_VFS_LINK); 1479 if (error != 0) 1480 return (error); 1481 } 1482 1483 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1484 error = priv_check_cred(cred, PRIV_VFS_LINK); 1485 if (error != 0) 1486 return (error); 1487 } 1488 1489 return (0); 1490 } 1491 1492 int 1493 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1494 const char *path2, enum uio_seg segflag, int follow) 1495 { 1496 struct nameidata nd; 1497 int error; 1498 1499 do { 1500 bwillwrite(); 1501 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag, 1502 path1, fd1, &cap_linkat_source_rights, td); 1503 if ((error = namei(&nd)) != 0) 1504 return (error); 1505 NDFREE(&nd, NDF_ONLY_PNBUF); 1506 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1507 } while (error == EAGAIN); 1508 return (error); 1509 } 1510 1511 static int 1512 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1513 enum uio_seg segflag) 1514 { 1515 struct nameidata nd; 1516 struct mount *mp; 1517 int error; 1518 1519 if (vp->v_type == VDIR) { 1520 vrele(vp); 1521 return (EPERM); /* POSIX */ 1522 } 1523 NDINIT_ATRIGHTS(&nd, CREATE, 1524 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1525 &cap_linkat_target_rights, td); 1526 if ((error = namei(&nd)) == 0) { 1527 if (nd.ni_vp != NULL) { 1528 NDFREE(&nd, NDF_ONLY_PNBUF); 1529 if (nd.ni_dvp == nd.ni_vp) 1530 vrele(nd.ni_dvp); 1531 else 1532 vput(nd.ni_dvp); 1533 vrele(nd.ni_vp); 1534 vrele(vp); 1535 return (EEXIST); 1536 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1537 /* 1538 * Cross-device link. No need to recheck 1539 * vp->v_type, since it cannot change, except 1540 * to VBAD. 1541 */ 1542 NDFREE(&nd, NDF_ONLY_PNBUF); 1543 vput(nd.ni_dvp); 1544 vrele(vp); 1545 return (EXDEV); 1546 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1547 error = can_hardlink(vp, td->td_ucred); 1548 #ifdef MAC 1549 if (error == 0) 1550 error = mac_vnode_check_link(td->td_ucred, 1551 nd.ni_dvp, vp, &nd.ni_cnd); 1552 #endif 1553 if (error != 0) { 1554 vput(vp); 1555 vput(nd.ni_dvp); 1556 NDFREE(&nd, NDF_ONLY_PNBUF); 1557 return (error); 1558 } 1559 error = vn_start_write(vp, &mp, V_NOWAIT); 1560 if (error != 0) { 1561 vput(vp); 1562 vput(nd.ni_dvp); 1563 NDFREE(&nd, NDF_ONLY_PNBUF); 1564 error = vn_start_write(NULL, &mp, 1565 V_XSLEEP | PCATCH); 1566 if (error != 0) 1567 return (error); 1568 return (EAGAIN); 1569 } 1570 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1571 VOP_UNLOCK(vp); 1572 vput(nd.ni_dvp); 1573 vn_finished_write(mp); 1574 NDFREE(&nd, NDF_ONLY_PNBUF); 1575 } else { 1576 vput(nd.ni_dvp); 1577 NDFREE(&nd, NDF_ONLY_PNBUF); 1578 vrele(vp); 1579 return (EAGAIN); 1580 } 1581 } 1582 vrele(vp); 1583 return (error); 1584 } 1585 1586 /* 1587 * Make a symbolic link. 1588 */ 1589 #ifndef _SYS_SYSPROTO_H_ 1590 struct symlink_args { 1591 char *path; 1592 char *link; 1593 }; 1594 #endif 1595 int 1596 sys_symlink(struct thread *td, struct symlink_args *uap) 1597 { 1598 1599 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1600 UIO_USERSPACE)); 1601 } 1602 1603 #ifndef _SYS_SYSPROTO_H_ 1604 struct symlinkat_args { 1605 char *path; 1606 int fd; 1607 char *path2; 1608 }; 1609 #endif 1610 int 1611 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1612 { 1613 1614 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1615 UIO_USERSPACE)); 1616 } 1617 1618 int 1619 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1620 enum uio_seg segflg) 1621 { 1622 struct mount *mp; 1623 struct vattr vattr; 1624 const char *syspath; 1625 char *tmppath; 1626 struct nameidata nd; 1627 int error; 1628 1629 if (segflg == UIO_SYSSPACE) { 1630 syspath = path1; 1631 } else { 1632 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1633 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1634 goto out; 1635 syspath = tmppath; 1636 } 1637 AUDIT_ARG_TEXT(syspath); 1638 restart: 1639 bwillwrite(); 1640 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1641 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1642 td); 1643 if ((error = namei(&nd)) != 0) 1644 goto out; 1645 if (nd.ni_vp) { 1646 NDFREE(&nd, NDF_ONLY_PNBUF); 1647 if (nd.ni_vp == nd.ni_dvp) 1648 vrele(nd.ni_dvp); 1649 else 1650 vput(nd.ni_dvp); 1651 vrele(nd.ni_vp); 1652 error = EEXIST; 1653 goto out; 1654 } 1655 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1656 NDFREE(&nd, NDF_ONLY_PNBUF); 1657 vput(nd.ni_dvp); 1658 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1659 goto out; 1660 goto restart; 1661 } 1662 VATTR_NULL(&vattr); 1663 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1664 #ifdef MAC 1665 vattr.va_type = VLNK; 1666 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1667 &vattr); 1668 if (error != 0) 1669 goto out2; 1670 #endif 1671 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1672 if (error == 0) 1673 vput(nd.ni_vp); 1674 #ifdef MAC 1675 out2: 1676 #endif 1677 NDFREE(&nd, NDF_ONLY_PNBUF); 1678 vput(nd.ni_dvp); 1679 vn_finished_write(mp); 1680 out: 1681 if (segflg != UIO_SYSSPACE) 1682 uma_zfree(namei_zone, tmppath); 1683 return (error); 1684 } 1685 1686 /* 1687 * Delete a whiteout from the filesystem. 1688 */ 1689 #ifndef _SYS_SYSPROTO_H_ 1690 struct undelete_args { 1691 char *path; 1692 }; 1693 #endif 1694 int 1695 sys_undelete(struct thread *td, struct undelete_args *uap) 1696 { 1697 struct mount *mp; 1698 struct nameidata nd; 1699 int error; 1700 1701 restart: 1702 bwillwrite(); 1703 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1704 UIO_USERSPACE, uap->path, td); 1705 error = namei(&nd); 1706 if (error != 0) 1707 return (error); 1708 1709 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1710 NDFREE(&nd, NDF_ONLY_PNBUF); 1711 if (nd.ni_vp == nd.ni_dvp) 1712 vrele(nd.ni_dvp); 1713 else 1714 vput(nd.ni_dvp); 1715 if (nd.ni_vp) 1716 vrele(nd.ni_vp); 1717 return (EEXIST); 1718 } 1719 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1720 NDFREE(&nd, NDF_ONLY_PNBUF); 1721 vput(nd.ni_dvp); 1722 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1723 return (error); 1724 goto restart; 1725 } 1726 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1727 NDFREE(&nd, NDF_ONLY_PNBUF); 1728 vput(nd.ni_dvp); 1729 vn_finished_write(mp); 1730 return (error); 1731 } 1732 1733 /* 1734 * Delete a name from the filesystem. 1735 */ 1736 #ifndef _SYS_SYSPROTO_H_ 1737 struct unlink_args { 1738 char *path; 1739 }; 1740 #endif 1741 int 1742 sys_unlink(struct thread *td, struct unlink_args *uap) 1743 { 1744 1745 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1746 0, 0)); 1747 } 1748 1749 static int 1750 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1751 int flag, enum uio_seg pathseg, ino_t oldinum) 1752 { 1753 1754 if ((flag & ~AT_REMOVEDIR) != 0) 1755 return (EINVAL); 1756 1757 if ((flag & AT_REMOVEDIR) != 0) 1758 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1759 1760 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1761 } 1762 1763 #ifndef _SYS_SYSPROTO_H_ 1764 struct unlinkat_args { 1765 int fd; 1766 char *path; 1767 int flag; 1768 }; 1769 #endif 1770 int 1771 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1772 { 1773 1774 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1775 UIO_USERSPACE, 0)); 1776 } 1777 1778 #ifndef _SYS_SYSPROTO_H_ 1779 struct funlinkat_args { 1780 int dfd; 1781 const char *path; 1782 int fd; 1783 int flag; 1784 }; 1785 #endif 1786 int 1787 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 1788 { 1789 1790 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 1791 UIO_USERSPACE, 0)); 1792 } 1793 1794 int 1795 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 1796 enum uio_seg pathseg, int flag, ino_t oldinum) 1797 { 1798 struct mount *mp; 1799 struct file *fp; 1800 struct vnode *vp; 1801 struct nameidata nd; 1802 struct stat sb; 1803 int error; 1804 1805 fp = NULL; 1806 if (fd != FD_NONE) { 1807 error = getvnode(td, fd, &cap_no_rights, &fp); 1808 if (error != 0) 1809 return (error); 1810 } 1811 1812 restart: 1813 bwillwrite(); 1814 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1815 ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 1816 pathseg, path, dfd, &cap_unlinkat_rights, td); 1817 if ((error = namei(&nd)) != 0) { 1818 if (error == EINVAL) 1819 error = EPERM; 1820 goto fdout; 1821 } 1822 vp = nd.ni_vp; 1823 if (vp->v_type == VDIR && oldinum == 0) { 1824 error = EPERM; /* POSIX */ 1825 } else if (oldinum != 0 && 1826 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1827 sb.st_ino != oldinum) { 1828 error = EIDRM; /* Identifier removed */ 1829 } else if (fp != NULL && fp->f_vnode != vp) { 1830 if (VN_IS_DOOMED(fp->f_vnode)) 1831 error = EBADF; 1832 else 1833 error = EDEADLK; 1834 } else { 1835 /* 1836 * The root of a mounted filesystem cannot be deleted. 1837 * 1838 * XXX: can this only be a VDIR case? 1839 */ 1840 if (vp->v_vflag & VV_ROOT) 1841 error = EBUSY; 1842 } 1843 if (error == 0) { 1844 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1845 NDFREE(&nd, NDF_ONLY_PNBUF); 1846 vput(nd.ni_dvp); 1847 if (vp == nd.ni_dvp) 1848 vrele(vp); 1849 else 1850 vput(vp); 1851 if ((error = vn_start_write(NULL, &mp, 1852 V_XSLEEP | PCATCH)) != 0) { 1853 goto fdout; 1854 } 1855 goto restart; 1856 } 1857 #ifdef MAC 1858 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1859 &nd.ni_cnd); 1860 if (error != 0) 1861 goto out; 1862 #endif 1863 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1864 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1865 #ifdef MAC 1866 out: 1867 #endif 1868 vn_finished_write(mp); 1869 } 1870 NDFREE(&nd, NDF_ONLY_PNBUF); 1871 vput(nd.ni_dvp); 1872 if (vp == nd.ni_dvp) 1873 vrele(vp); 1874 else 1875 vput(vp); 1876 fdout: 1877 if (fp != NULL) 1878 fdrop(fp, td); 1879 return (error); 1880 } 1881 1882 /* 1883 * Reposition read/write file offset. 1884 */ 1885 #ifndef _SYS_SYSPROTO_H_ 1886 struct lseek_args { 1887 int fd; 1888 int pad; 1889 off_t offset; 1890 int whence; 1891 }; 1892 #endif 1893 int 1894 sys_lseek(struct thread *td, struct lseek_args *uap) 1895 { 1896 1897 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1898 } 1899 1900 int 1901 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1902 { 1903 struct file *fp; 1904 int error; 1905 1906 AUDIT_ARG_FD(fd); 1907 error = fget(td, fd, &cap_seek_rights, &fp); 1908 if (error != 0) 1909 return (error); 1910 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1911 fo_seek(fp, offset, whence, td) : ESPIPE; 1912 fdrop(fp, td); 1913 return (error); 1914 } 1915 1916 #if defined(COMPAT_43) 1917 /* 1918 * Reposition read/write file offset. 1919 */ 1920 #ifndef _SYS_SYSPROTO_H_ 1921 struct olseek_args { 1922 int fd; 1923 long offset; 1924 int whence; 1925 }; 1926 #endif 1927 int 1928 olseek(struct thread *td, struct olseek_args *uap) 1929 { 1930 1931 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1932 } 1933 #endif /* COMPAT_43 */ 1934 1935 #if defined(COMPAT_FREEBSD6) 1936 /* Version with the 'pad' argument */ 1937 int 1938 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 1939 { 1940 1941 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1942 } 1943 #endif 1944 1945 /* 1946 * Check access permissions using passed credentials. 1947 */ 1948 static int 1949 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 1950 struct thread *td) 1951 { 1952 accmode_t accmode; 1953 int error; 1954 1955 /* Flags == 0 means only check for existence. */ 1956 if (user_flags == 0) 1957 return (0); 1958 1959 accmode = 0; 1960 if (user_flags & R_OK) 1961 accmode |= VREAD; 1962 if (user_flags & W_OK) 1963 accmode |= VWRITE; 1964 if (user_flags & X_OK) 1965 accmode |= VEXEC; 1966 #ifdef MAC 1967 error = mac_vnode_check_access(cred, vp, accmode); 1968 if (error != 0) 1969 return (error); 1970 #endif 1971 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1972 error = VOP_ACCESS(vp, accmode, cred, td); 1973 return (error); 1974 } 1975 1976 /* 1977 * Check access permissions using "real" credentials. 1978 */ 1979 #ifndef _SYS_SYSPROTO_H_ 1980 struct access_args { 1981 char *path; 1982 int amode; 1983 }; 1984 #endif 1985 int 1986 sys_access(struct thread *td, struct access_args *uap) 1987 { 1988 1989 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1990 0, uap->amode)); 1991 } 1992 1993 #ifndef _SYS_SYSPROTO_H_ 1994 struct faccessat_args { 1995 int dirfd; 1996 char *path; 1997 int amode; 1998 int flag; 1999 } 2000 #endif 2001 int 2002 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2003 { 2004 2005 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2006 uap->amode)); 2007 } 2008 2009 int 2010 kern_accessat(struct thread *td, int fd, const char *path, 2011 enum uio_seg pathseg, int flag, int amode) 2012 { 2013 struct ucred *cred, *usecred; 2014 struct vnode *vp; 2015 struct nameidata nd; 2016 int error; 2017 2018 if ((flag & ~(AT_EACCESS | AT_BENEATH)) != 0) 2019 return (EINVAL); 2020 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2021 return (EINVAL); 2022 2023 /* 2024 * Create and modify a temporary credential instead of one that 2025 * is potentially shared (if we need one). 2026 */ 2027 cred = td->td_ucred; 2028 if ((flag & AT_EACCESS) == 0 && 2029 ((cred->cr_uid != cred->cr_ruid || 2030 cred->cr_rgid != cred->cr_groups[0]))) { 2031 usecred = crdup(cred); 2032 usecred->cr_uid = cred->cr_ruid; 2033 usecred->cr_groups[0] = cred->cr_rgid; 2034 td->td_ucred = usecred; 2035 } else 2036 usecred = cred; 2037 AUDIT_ARG_VALUE(amode); 2038 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2039 AUDITVNODE1 | ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 2040 pathseg, path, fd, &cap_fstat_rights, td); 2041 if ((error = namei(&nd)) != 0) 2042 goto out; 2043 vp = nd.ni_vp; 2044 2045 error = vn_access(vp, amode, usecred, td); 2046 NDFREE(&nd, NDF_ONLY_PNBUF); 2047 vput(vp); 2048 out: 2049 if (usecred != cred) { 2050 td->td_ucred = cred; 2051 crfree(usecred); 2052 } 2053 return (error); 2054 } 2055 2056 /* 2057 * Check access permissions using "effective" credentials. 2058 */ 2059 #ifndef _SYS_SYSPROTO_H_ 2060 struct eaccess_args { 2061 char *path; 2062 int amode; 2063 }; 2064 #endif 2065 int 2066 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2067 { 2068 2069 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2070 AT_EACCESS, uap->amode)); 2071 } 2072 2073 #if defined(COMPAT_43) 2074 /* 2075 * Get file status; this version follows links. 2076 */ 2077 #ifndef _SYS_SYSPROTO_H_ 2078 struct ostat_args { 2079 char *path; 2080 struct ostat *ub; 2081 }; 2082 #endif 2083 int 2084 ostat(struct thread *td, struct ostat_args *uap) 2085 { 2086 struct stat sb; 2087 struct ostat osb; 2088 int error; 2089 2090 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2091 &sb, NULL); 2092 if (error != 0) 2093 return (error); 2094 cvtstat(&sb, &osb); 2095 return (copyout(&osb, uap->ub, sizeof (osb))); 2096 } 2097 2098 /* 2099 * Get file status; this version does not follow links. 2100 */ 2101 #ifndef _SYS_SYSPROTO_H_ 2102 struct olstat_args { 2103 char *path; 2104 struct ostat *ub; 2105 }; 2106 #endif 2107 int 2108 olstat(struct thread *td, struct olstat_args *uap) 2109 { 2110 struct stat sb; 2111 struct ostat osb; 2112 int error; 2113 2114 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2115 UIO_USERSPACE, &sb, NULL); 2116 if (error != 0) 2117 return (error); 2118 cvtstat(&sb, &osb); 2119 return (copyout(&osb, uap->ub, sizeof (osb))); 2120 } 2121 2122 /* 2123 * Convert from an old to a new stat structure. 2124 * XXX: many values are blindly truncated. 2125 */ 2126 void 2127 cvtstat(struct stat *st, struct ostat *ost) 2128 { 2129 2130 bzero(ost, sizeof(*ost)); 2131 ost->st_dev = st->st_dev; 2132 ost->st_ino = st->st_ino; 2133 ost->st_mode = st->st_mode; 2134 ost->st_nlink = st->st_nlink; 2135 ost->st_uid = st->st_uid; 2136 ost->st_gid = st->st_gid; 2137 ost->st_rdev = st->st_rdev; 2138 ost->st_size = MIN(st->st_size, INT32_MAX); 2139 ost->st_atim = st->st_atim; 2140 ost->st_mtim = st->st_mtim; 2141 ost->st_ctim = st->st_ctim; 2142 ost->st_blksize = st->st_blksize; 2143 ost->st_blocks = st->st_blocks; 2144 ost->st_flags = st->st_flags; 2145 ost->st_gen = st->st_gen; 2146 } 2147 #endif /* COMPAT_43 */ 2148 2149 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2150 int ino64_trunc_error; 2151 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2152 &ino64_trunc_error, 0, 2153 "Error on truncation of device, file or inode number, or link count"); 2154 2155 int 2156 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2157 { 2158 2159 ost->st_dev = st->st_dev; 2160 if (ost->st_dev != st->st_dev) { 2161 switch (ino64_trunc_error) { 2162 default: 2163 /* 2164 * Since dev_t is almost raw, don't clamp to the 2165 * maximum for case 2, but ignore the error. 2166 */ 2167 break; 2168 case 1: 2169 return (EOVERFLOW); 2170 } 2171 } 2172 ost->st_ino = st->st_ino; 2173 if (ost->st_ino != st->st_ino) { 2174 switch (ino64_trunc_error) { 2175 default: 2176 case 0: 2177 break; 2178 case 1: 2179 return (EOVERFLOW); 2180 case 2: 2181 ost->st_ino = UINT32_MAX; 2182 break; 2183 } 2184 } 2185 ost->st_mode = st->st_mode; 2186 ost->st_nlink = st->st_nlink; 2187 if (ost->st_nlink != st->st_nlink) { 2188 switch (ino64_trunc_error) { 2189 default: 2190 case 0: 2191 break; 2192 case 1: 2193 return (EOVERFLOW); 2194 case 2: 2195 ost->st_nlink = UINT16_MAX; 2196 break; 2197 } 2198 } 2199 ost->st_uid = st->st_uid; 2200 ost->st_gid = st->st_gid; 2201 ost->st_rdev = st->st_rdev; 2202 if (ost->st_rdev != st->st_rdev) { 2203 switch (ino64_trunc_error) { 2204 default: 2205 break; 2206 case 1: 2207 return (EOVERFLOW); 2208 } 2209 } 2210 ost->st_atim = st->st_atim; 2211 ost->st_mtim = st->st_mtim; 2212 ost->st_ctim = st->st_ctim; 2213 ost->st_size = st->st_size; 2214 ost->st_blocks = st->st_blocks; 2215 ost->st_blksize = st->st_blksize; 2216 ost->st_flags = st->st_flags; 2217 ost->st_gen = st->st_gen; 2218 ost->st_lspare = 0; 2219 ost->st_birthtim = st->st_birthtim; 2220 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2221 sizeof(*ost) - offsetof(struct freebsd11_stat, 2222 st_birthtim) - sizeof(ost->st_birthtim)); 2223 return (0); 2224 } 2225 2226 int 2227 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2228 { 2229 struct stat sb; 2230 struct freebsd11_stat osb; 2231 int error; 2232 2233 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2234 &sb, NULL); 2235 if (error != 0) 2236 return (error); 2237 error = freebsd11_cvtstat(&sb, &osb); 2238 if (error == 0) 2239 error = copyout(&osb, uap->ub, sizeof(osb)); 2240 return (error); 2241 } 2242 2243 int 2244 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2245 { 2246 struct stat sb; 2247 struct freebsd11_stat osb; 2248 int error; 2249 2250 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2251 UIO_USERSPACE, &sb, NULL); 2252 if (error != 0) 2253 return (error); 2254 error = freebsd11_cvtstat(&sb, &osb); 2255 if (error == 0) 2256 error = copyout(&osb, uap->ub, sizeof(osb)); 2257 return (error); 2258 } 2259 2260 int 2261 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2262 { 2263 struct fhandle fh; 2264 struct stat sb; 2265 struct freebsd11_stat osb; 2266 int error; 2267 2268 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2269 if (error != 0) 2270 return (error); 2271 error = kern_fhstat(td, fh, &sb); 2272 if (error != 0) 2273 return (error); 2274 error = freebsd11_cvtstat(&sb, &osb); 2275 if (error == 0) 2276 error = copyout(&osb, uap->sb, sizeof(osb)); 2277 return (error); 2278 } 2279 2280 int 2281 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2282 { 2283 struct stat sb; 2284 struct freebsd11_stat osb; 2285 int error; 2286 2287 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2288 UIO_USERSPACE, &sb, NULL); 2289 if (error != 0) 2290 return (error); 2291 error = freebsd11_cvtstat(&sb, &osb); 2292 if (error == 0) 2293 error = copyout(&osb, uap->buf, sizeof(osb)); 2294 return (error); 2295 } 2296 #endif /* COMPAT_FREEBSD11 */ 2297 2298 /* 2299 * Get file status 2300 */ 2301 #ifndef _SYS_SYSPROTO_H_ 2302 struct fstatat_args { 2303 int fd; 2304 char *path; 2305 struct stat *buf; 2306 int flag; 2307 } 2308 #endif 2309 int 2310 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2311 { 2312 struct stat sb; 2313 int error; 2314 2315 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2316 UIO_USERSPACE, &sb, NULL); 2317 if (error == 0) 2318 error = copyout(&sb, uap->buf, sizeof (sb)); 2319 return (error); 2320 } 2321 2322 int 2323 kern_statat(struct thread *td, int flag, int fd, const char *path, 2324 enum uio_seg pathseg, struct stat *sbp, 2325 void (*hook)(struct vnode *vp, struct stat *sbp)) 2326 { 2327 struct nameidata nd; 2328 int error; 2329 2330 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2331 return (EINVAL); 2332 2333 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) != 0 ? 2334 NOFOLLOW : FOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0) | 2335 LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd, 2336 &cap_fstat_rights, td); 2337 2338 if ((error = namei(&nd)) != 0) 2339 return (error); 2340 error = vn_stat(nd.ni_vp, sbp, td->td_ucred, NOCRED, td); 2341 if (error == 0) { 2342 SDT_PROBE2(vfs, , stat, mode, path, sbp->st_mode); 2343 if (S_ISREG(sbp->st_mode)) 2344 SDT_PROBE2(vfs, , stat, reg, path, pathseg); 2345 if (__predict_false(hook != NULL)) 2346 hook(nd.ni_vp, sbp); 2347 } 2348 NDFREE(&nd, NDF_ONLY_PNBUF); 2349 vput(nd.ni_vp); 2350 if (error != 0) 2351 return (error); 2352 #ifdef __STAT_TIME_T_EXT 2353 sbp->st_atim_ext = 0; 2354 sbp->st_mtim_ext = 0; 2355 sbp->st_ctim_ext = 0; 2356 sbp->st_btim_ext = 0; 2357 #endif 2358 #ifdef KTRACE 2359 if (KTRPOINT(td, KTR_STRUCT)) 2360 ktrstat(sbp); 2361 #endif 2362 return (0); 2363 } 2364 2365 #if defined(COMPAT_FREEBSD11) 2366 /* 2367 * Implementation of the NetBSD [l]stat() functions. 2368 */ 2369 void 2370 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2371 { 2372 2373 bzero(nsb, sizeof(*nsb)); 2374 nsb->st_dev = sb->st_dev; 2375 nsb->st_ino = sb->st_ino; 2376 nsb->st_mode = sb->st_mode; 2377 nsb->st_nlink = sb->st_nlink; 2378 nsb->st_uid = sb->st_uid; 2379 nsb->st_gid = sb->st_gid; 2380 nsb->st_rdev = sb->st_rdev; 2381 nsb->st_atim = sb->st_atim; 2382 nsb->st_mtim = sb->st_mtim; 2383 nsb->st_ctim = sb->st_ctim; 2384 nsb->st_size = sb->st_size; 2385 nsb->st_blocks = sb->st_blocks; 2386 nsb->st_blksize = sb->st_blksize; 2387 nsb->st_flags = sb->st_flags; 2388 nsb->st_gen = sb->st_gen; 2389 nsb->st_birthtim = sb->st_birthtim; 2390 } 2391 2392 #ifndef _SYS_SYSPROTO_H_ 2393 struct freebsd11_nstat_args { 2394 char *path; 2395 struct nstat *ub; 2396 }; 2397 #endif 2398 int 2399 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2400 { 2401 struct stat sb; 2402 struct nstat nsb; 2403 int error; 2404 2405 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2406 &sb, NULL); 2407 if (error != 0) 2408 return (error); 2409 freebsd11_cvtnstat(&sb, &nsb); 2410 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2411 } 2412 2413 /* 2414 * NetBSD lstat. Get file status; this version does not follow links. 2415 */ 2416 #ifndef _SYS_SYSPROTO_H_ 2417 struct freebsd11_nlstat_args { 2418 char *path; 2419 struct nstat *ub; 2420 }; 2421 #endif 2422 int 2423 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2424 { 2425 struct stat sb; 2426 struct nstat nsb; 2427 int error; 2428 2429 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2430 UIO_USERSPACE, &sb, NULL); 2431 if (error != 0) 2432 return (error); 2433 freebsd11_cvtnstat(&sb, &nsb); 2434 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2435 } 2436 #endif /* COMPAT_FREEBSD11 */ 2437 2438 /* 2439 * Get configurable pathname variables. 2440 */ 2441 #ifndef _SYS_SYSPROTO_H_ 2442 struct pathconf_args { 2443 char *path; 2444 int name; 2445 }; 2446 #endif 2447 int 2448 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2449 { 2450 long value; 2451 int error; 2452 2453 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2454 &value); 2455 if (error == 0) 2456 td->td_retval[0] = value; 2457 return (error); 2458 } 2459 2460 #ifndef _SYS_SYSPROTO_H_ 2461 struct lpathconf_args { 2462 char *path; 2463 int name; 2464 }; 2465 #endif 2466 int 2467 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2468 { 2469 long value; 2470 int error; 2471 2472 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2473 NOFOLLOW, &value); 2474 if (error == 0) 2475 td->td_retval[0] = value; 2476 return (error); 2477 } 2478 2479 int 2480 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2481 int name, u_long flags, long *valuep) 2482 { 2483 struct nameidata nd; 2484 int error; 2485 2486 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2487 pathseg, path, td); 2488 if ((error = namei(&nd)) != 0) 2489 return (error); 2490 NDFREE(&nd, NDF_ONLY_PNBUF); 2491 2492 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2493 vput(nd.ni_vp); 2494 return (error); 2495 } 2496 2497 /* 2498 * Return target name of a symbolic link. 2499 */ 2500 #ifndef _SYS_SYSPROTO_H_ 2501 struct readlink_args { 2502 char *path; 2503 char *buf; 2504 size_t count; 2505 }; 2506 #endif 2507 int 2508 sys_readlink(struct thread *td, struct readlink_args *uap) 2509 { 2510 2511 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2512 uap->buf, UIO_USERSPACE, uap->count)); 2513 } 2514 #ifndef _SYS_SYSPROTO_H_ 2515 struct readlinkat_args { 2516 int fd; 2517 char *path; 2518 char *buf; 2519 size_t bufsize; 2520 }; 2521 #endif 2522 int 2523 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2524 { 2525 2526 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2527 uap->buf, UIO_USERSPACE, uap->bufsize)); 2528 } 2529 2530 int 2531 kern_readlinkat(struct thread *td, int fd, const char *path, 2532 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2533 { 2534 struct vnode *vp; 2535 struct nameidata nd; 2536 int error; 2537 2538 if (count > IOSIZE_MAX) 2539 return (EINVAL); 2540 2541 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2542 pathseg, path, fd, td); 2543 2544 if ((error = namei(&nd)) != 0) 2545 return (error); 2546 NDFREE(&nd, NDF_ONLY_PNBUF); 2547 vp = nd.ni_vp; 2548 2549 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2550 vput(vp); 2551 2552 return (error); 2553 } 2554 2555 /* 2556 * Helper function to readlink from a vnode 2557 */ 2558 static int 2559 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2560 struct thread *td) 2561 { 2562 struct iovec aiov; 2563 struct uio auio; 2564 int error; 2565 2566 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2567 #ifdef MAC 2568 error = mac_vnode_check_readlink(td->td_ucred, vp); 2569 if (error != 0) 2570 return (error); 2571 #endif 2572 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2573 return (EINVAL); 2574 2575 aiov.iov_base = buf; 2576 aiov.iov_len = count; 2577 auio.uio_iov = &aiov; 2578 auio.uio_iovcnt = 1; 2579 auio.uio_offset = 0; 2580 auio.uio_rw = UIO_READ; 2581 auio.uio_segflg = bufseg; 2582 auio.uio_td = td; 2583 auio.uio_resid = count; 2584 error = VOP_READLINK(vp, &auio, td->td_ucred); 2585 td->td_retval[0] = count - auio.uio_resid; 2586 return (error); 2587 } 2588 2589 /* 2590 * Common implementation code for chflags() and fchflags(). 2591 */ 2592 static int 2593 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2594 { 2595 struct mount *mp; 2596 struct vattr vattr; 2597 int error; 2598 2599 /* We can't support the value matching VNOVAL. */ 2600 if (flags == VNOVAL) 2601 return (EOPNOTSUPP); 2602 2603 /* 2604 * Prevent non-root users from setting flags on devices. When 2605 * a device is reused, users can retain ownership of the device 2606 * if they are allowed to set flags and programs assume that 2607 * chown can't fail when done as root. 2608 */ 2609 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2610 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2611 if (error != 0) 2612 return (error); 2613 } 2614 2615 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2616 return (error); 2617 VATTR_NULL(&vattr); 2618 vattr.va_flags = flags; 2619 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2620 #ifdef MAC 2621 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2622 if (error == 0) 2623 #endif 2624 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2625 VOP_UNLOCK(vp); 2626 vn_finished_write(mp); 2627 return (error); 2628 } 2629 2630 /* 2631 * Change flags of a file given a path name. 2632 */ 2633 #ifndef _SYS_SYSPROTO_H_ 2634 struct chflags_args { 2635 const char *path; 2636 u_long flags; 2637 }; 2638 #endif 2639 int 2640 sys_chflags(struct thread *td, struct chflags_args *uap) 2641 { 2642 2643 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2644 uap->flags, 0)); 2645 } 2646 2647 #ifndef _SYS_SYSPROTO_H_ 2648 struct chflagsat_args { 2649 int fd; 2650 const char *path; 2651 u_long flags; 2652 int atflag; 2653 } 2654 #endif 2655 int 2656 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2657 { 2658 2659 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2660 return (EINVAL); 2661 2662 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2663 uap->flags, uap->atflag)); 2664 } 2665 2666 /* 2667 * Same as chflags() but doesn't follow symlinks. 2668 */ 2669 #ifndef _SYS_SYSPROTO_H_ 2670 struct lchflags_args { 2671 const char *path; 2672 u_long flags; 2673 }; 2674 #endif 2675 int 2676 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2677 { 2678 2679 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2680 uap->flags, AT_SYMLINK_NOFOLLOW)); 2681 } 2682 2683 static int 2684 kern_chflagsat(struct thread *td, int fd, const char *path, 2685 enum uio_seg pathseg, u_long flags, int atflag) 2686 { 2687 struct nameidata nd; 2688 int error, follow; 2689 2690 AUDIT_ARG_FFLAGS(flags); 2691 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2692 follow |= (atflag & AT_BENEATH) != 0 ? BENEATH : 0; 2693 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2694 &cap_fchflags_rights, td); 2695 if ((error = namei(&nd)) != 0) 2696 return (error); 2697 NDFREE(&nd, NDF_ONLY_PNBUF); 2698 error = setfflags(td, nd.ni_vp, flags); 2699 vrele(nd.ni_vp); 2700 return (error); 2701 } 2702 2703 /* 2704 * Change flags of a file given a file descriptor. 2705 */ 2706 #ifndef _SYS_SYSPROTO_H_ 2707 struct fchflags_args { 2708 int fd; 2709 u_long flags; 2710 }; 2711 #endif 2712 int 2713 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2714 { 2715 struct file *fp; 2716 int error; 2717 2718 AUDIT_ARG_FD(uap->fd); 2719 AUDIT_ARG_FFLAGS(uap->flags); 2720 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2721 &fp); 2722 if (error != 0) 2723 return (error); 2724 #ifdef AUDIT 2725 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2726 AUDIT_ARG_VNODE1(fp->f_vnode); 2727 VOP_UNLOCK(fp->f_vnode); 2728 #endif 2729 error = setfflags(td, fp->f_vnode, uap->flags); 2730 fdrop(fp, td); 2731 return (error); 2732 } 2733 2734 /* 2735 * Common implementation code for chmod(), lchmod() and fchmod(). 2736 */ 2737 int 2738 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2739 { 2740 struct mount *mp; 2741 struct vattr vattr; 2742 int error; 2743 2744 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2745 return (error); 2746 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2747 VATTR_NULL(&vattr); 2748 vattr.va_mode = mode & ALLPERMS; 2749 #ifdef MAC 2750 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2751 if (error == 0) 2752 #endif 2753 error = VOP_SETATTR(vp, &vattr, cred); 2754 VOP_UNLOCK(vp); 2755 vn_finished_write(mp); 2756 return (error); 2757 } 2758 2759 /* 2760 * Change mode of a file given path name. 2761 */ 2762 #ifndef _SYS_SYSPROTO_H_ 2763 struct chmod_args { 2764 char *path; 2765 int mode; 2766 }; 2767 #endif 2768 int 2769 sys_chmod(struct thread *td, struct chmod_args *uap) 2770 { 2771 2772 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2773 uap->mode, 0)); 2774 } 2775 2776 #ifndef _SYS_SYSPROTO_H_ 2777 struct fchmodat_args { 2778 int dirfd; 2779 char *path; 2780 mode_t mode; 2781 int flag; 2782 } 2783 #endif 2784 int 2785 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2786 { 2787 2788 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2789 return (EINVAL); 2790 2791 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2792 uap->mode, uap->flag)); 2793 } 2794 2795 /* 2796 * Change mode of a file given path name (don't follow links.) 2797 */ 2798 #ifndef _SYS_SYSPROTO_H_ 2799 struct lchmod_args { 2800 char *path; 2801 int mode; 2802 }; 2803 #endif 2804 int 2805 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2806 { 2807 2808 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2809 uap->mode, AT_SYMLINK_NOFOLLOW)); 2810 } 2811 2812 int 2813 kern_fchmodat(struct thread *td, int fd, const char *path, 2814 enum uio_seg pathseg, mode_t mode, int flag) 2815 { 2816 struct nameidata nd; 2817 int error, follow; 2818 2819 AUDIT_ARG_MODE(mode); 2820 follow = (flag & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : FOLLOW; 2821 follow |= (flag & AT_BENEATH) != 0 ? BENEATH : 0; 2822 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2823 &cap_fchmod_rights, td); 2824 if ((error = namei(&nd)) != 0) 2825 return (error); 2826 NDFREE(&nd, NDF_ONLY_PNBUF); 2827 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2828 vrele(nd.ni_vp); 2829 return (error); 2830 } 2831 2832 /* 2833 * Change mode of a file given a file descriptor. 2834 */ 2835 #ifndef _SYS_SYSPROTO_H_ 2836 struct fchmod_args { 2837 int fd; 2838 int mode; 2839 }; 2840 #endif 2841 int 2842 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2843 { 2844 struct file *fp; 2845 int error; 2846 2847 AUDIT_ARG_FD(uap->fd); 2848 AUDIT_ARG_MODE(uap->mode); 2849 2850 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2851 if (error != 0) 2852 return (error); 2853 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2854 fdrop(fp, td); 2855 return (error); 2856 } 2857 2858 /* 2859 * Common implementation for chown(), lchown(), and fchown() 2860 */ 2861 int 2862 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2863 gid_t gid) 2864 { 2865 struct mount *mp; 2866 struct vattr vattr; 2867 int error; 2868 2869 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2870 return (error); 2871 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2872 VATTR_NULL(&vattr); 2873 vattr.va_uid = uid; 2874 vattr.va_gid = gid; 2875 #ifdef MAC 2876 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2877 vattr.va_gid); 2878 if (error == 0) 2879 #endif 2880 error = VOP_SETATTR(vp, &vattr, cred); 2881 VOP_UNLOCK(vp); 2882 vn_finished_write(mp); 2883 return (error); 2884 } 2885 2886 /* 2887 * Set ownership given a path name. 2888 */ 2889 #ifndef _SYS_SYSPROTO_H_ 2890 struct chown_args { 2891 char *path; 2892 int uid; 2893 int gid; 2894 }; 2895 #endif 2896 int 2897 sys_chown(struct thread *td, struct chown_args *uap) 2898 { 2899 2900 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2901 uap->gid, 0)); 2902 } 2903 2904 #ifndef _SYS_SYSPROTO_H_ 2905 struct fchownat_args { 2906 int fd; 2907 const char * path; 2908 uid_t uid; 2909 gid_t gid; 2910 int flag; 2911 }; 2912 #endif 2913 int 2914 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2915 { 2916 2917 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2918 return (EINVAL); 2919 2920 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 2921 uap->gid, uap->flag)); 2922 } 2923 2924 int 2925 kern_fchownat(struct thread *td, int fd, const char *path, 2926 enum uio_seg pathseg, int uid, int gid, int flag) 2927 { 2928 struct nameidata nd; 2929 int error, follow; 2930 2931 AUDIT_ARG_OWNER(uid, gid); 2932 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2933 follow |= (flag & AT_BENEATH) != 0 ? BENEATH : 0; 2934 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2935 &cap_fchown_rights, td); 2936 2937 if ((error = namei(&nd)) != 0) 2938 return (error); 2939 NDFREE(&nd, NDF_ONLY_PNBUF); 2940 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 2941 vrele(nd.ni_vp); 2942 return (error); 2943 } 2944 2945 /* 2946 * Set ownership given a path name, do not cross symlinks. 2947 */ 2948 #ifndef _SYS_SYSPROTO_H_ 2949 struct lchown_args { 2950 char *path; 2951 int uid; 2952 int gid; 2953 }; 2954 #endif 2955 int 2956 sys_lchown(struct thread *td, struct lchown_args *uap) 2957 { 2958 2959 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2960 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 2961 } 2962 2963 /* 2964 * Set ownership given a file descriptor. 2965 */ 2966 #ifndef _SYS_SYSPROTO_H_ 2967 struct fchown_args { 2968 int fd; 2969 int uid; 2970 int gid; 2971 }; 2972 #endif 2973 int 2974 sys_fchown(struct thread *td, struct fchown_args *uap) 2975 { 2976 struct file *fp; 2977 int error; 2978 2979 AUDIT_ARG_FD(uap->fd); 2980 AUDIT_ARG_OWNER(uap->uid, uap->gid); 2981 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 2982 if (error != 0) 2983 return (error); 2984 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 2985 fdrop(fp, td); 2986 return (error); 2987 } 2988 2989 /* 2990 * Common implementation code for utimes(), lutimes(), and futimes(). 2991 */ 2992 static int 2993 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 2994 struct timespec *tsp) 2995 { 2996 struct timeval tv[2]; 2997 const struct timeval *tvp; 2998 int error; 2999 3000 if (usrtvp == NULL) { 3001 vfs_timestamp(&tsp[0]); 3002 tsp[1] = tsp[0]; 3003 } else { 3004 if (tvpseg == UIO_SYSSPACE) { 3005 tvp = usrtvp; 3006 } else { 3007 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3008 return (error); 3009 tvp = tv; 3010 } 3011 3012 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3013 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3014 return (EINVAL); 3015 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3016 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3017 } 3018 return (0); 3019 } 3020 3021 /* 3022 * Common implementation code for futimens(), utimensat(). 3023 */ 3024 #define UTIMENS_NULL 0x1 3025 #define UTIMENS_EXIT 0x2 3026 static int 3027 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3028 struct timespec *tsp, int *retflags) 3029 { 3030 struct timespec tsnow; 3031 int error; 3032 3033 vfs_timestamp(&tsnow); 3034 *retflags = 0; 3035 if (usrtsp == NULL) { 3036 tsp[0] = tsnow; 3037 tsp[1] = tsnow; 3038 *retflags |= UTIMENS_NULL; 3039 return (0); 3040 } 3041 if (tspseg == UIO_SYSSPACE) { 3042 tsp[0] = usrtsp[0]; 3043 tsp[1] = usrtsp[1]; 3044 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3045 return (error); 3046 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3047 *retflags |= UTIMENS_EXIT; 3048 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3049 *retflags |= UTIMENS_NULL; 3050 if (tsp[0].tv_nsec == UTIME_OMIT) 3051 tsp[0].tv_sec = VNOVAL; 3052 else if (tsp[0].tv_nsec == UTIME_NOW) 3053 tsp[0] = tsnow; 3054 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3055 return (EINVAL); 3056 if (tsp[1].tv_nsec == UTIME_OMIT) 3057 tsp[1].tv_sec = VNOVAL; 3058 else if (tsp[1].tv_nsec == UTIME_NOW) 3059 tsp[1] = tsnow; 3060 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3061 return (EINVAL); 3062 3063 return (0); 3064 } 3065 3066 /* 3067 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3068 * and utimensat(). 3069 */ 3070 static int 3071 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3072 int numtimes, int nullflag) 3073 { 3074 struct mount *mp; 3075 struct vattr vattr; 3076 int error, setbirthtime; 3077 3078 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3079 return (error); 3080 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3081 setbirthtime = 0; 3082 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3083 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3084 setbirthtime = 1; 3085 VATTR_NULL(&vattr); 3086 vattr.va_atime = ts[0]; 3087 vattr.va_mtime = ts[1]; 3088 if (setbirthtime) 3089 vattr.va_birthtime = ts[1]; 3090 if (numtimes > 2) 3091 vattr.va_birthtime = ts[2]; 3092 if (nullflag) 3093 vattr.va_vaflags |= VA_UTIMES_NULL; 3094 #ifdef MAC 3095 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3096 vattr.va_mtime); 3097 #endif 3098 if (error == 0) 3099 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3100 VOP_UNLOCK(vp); 3101 vn_finished_write(mp); 3102 return (error); 3103 } 3104 3105 /* 3106 * Set the access and modification times of a file. 3107 */ 3108 #ifndef _SYS_SYSPROTO_H_ 3109 struct utimes_args { 3110 char *path; 3111 struct timeval *tptr; 3112 }; 3113 #endif 3114 int 3115 sys_utimes(struct thread *td, struct utimes_args *uap) 3116 { 3117 3118 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3119 uap->tptr, UIO_USERSPACE)); 3120 } 3121 3122 #ifndef _SYS_SYSPROTO_H_ 3123 struct futimesat_args { 3124 int fd; 3125 const char * path; 3126 const struct timeval * times; 3127 }; 3128 #endif 3129 int 3130 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3131 { 3132 3133 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3134 uap->times, UIO_USERSPACE)); 3135 } 3136 3137 int 3138 kern_utimesat(struct thread *td, int fd, const char *path, 3139 enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) 3140 { 3141 struct nameidata nd; 3142 struct timespec ts[2]; 3143 int error; 3144 3145 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3146 return (error); 3147 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3148 &cap_futimes_rights, td); 3149 3150 if ((error = namei(&nd)) != 0) 3151 return (error); 3152 NDFREE(&nd, NDF_ONLY_PNBUF); 3153 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3154 vrele(nd.ni_vp); 3155 return (error); 3156 } 3157 3158 /* 3159 * Set the access and modification times of a file. 3160 */ 3161 #ifndef _SYS_SYSPROTO_H_ 3162 struct lutimes_args { 3163 char *path; 3164 struct timeval *tptr; 3165 }; 3166 #endif 3167 int 3168 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3169 { 3170 3171 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3172 UIO_USERSPACE)); 3173 } 3174 3175 int 3176 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3177 struct timeval *tptr, enum uio_seg tptrseg) 3178 { 3179 struct timespec ts[2]; 3180 struct nameidata nd; 3181 int error; 3182 3183 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3184 return (error); 3185 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3186 if ((error = namei(&nd)) != 0) 3187 return (error); 3188 NDFREE(&nd, NDF_ONLY_PNBUF); 3189 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3190 vrele(nd.ni_vp); 3191 return (error); 3192 } 3193 3194 /* 3195 * Set the access and modification times of a file. 3196 */ 3197 #ifndef _SYS_SYSPROTO_H_ 3198 struct futimes_args { 3199 int fd; 3200 struct timeval *tptr; 3201 }; 3202 #endif 3203 int 3204 sys_futimes(struct thread *td, struct futimes_args *uap) 3205 { 3206 3207 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3208 } 3209 3210 int 3211 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3212 enum uio_seg tptrseg) 3213 { 3214 struct timespec ts[2]; 3215 struct file *fp; 3216 int error; 3217 3218 AUDIT_ARG_FD(fd); 3219 error = getutimes(tptr, tptrseg, ts); 3220 if (error != 0) 3221 return (error); 3222 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3223 if (error != 0) 3224 return (error); 3225 #ifdef AUDIT 3226 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3227 AUDIT_ARG_VNODE1(fp->f_vnode); 3228 VOP_UNLOCK(fp->f_vnode); 3229 #endif 3230 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3231 fdrop(fp, td); 3232 return (error); 3233 } 3234 3235 int 3236 sys_futimens(struct thread *td, struct futimens_args *uap) 3237 { 3238 3239 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3240 } 3241 3242 int 3243 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3244 enum uio_seg tptrseg) 3245 { 3246 struct timespec ts[2]; 3247 struct file *fp; 3248 int error, flags; 3249 3250 AUDIT_ARG_FD(fd); 3251 error = getutimens(tptr, tptrseg, ts, &flags); 3252 if (error != 0) 3253 return (error); 3254 if (flags & UTIMENS_EXIT) 3255 return (0); 3256 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3257 if (error != 0) 3258 return (error); 3259 #ifdef AUDIT 3260 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3261 AUDIT_ARG_VNODE1(fp->f_vnode); 3262 VOP_UNLOCK(fp->f_vnode); 3263 #endif 3264 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3265 fdrop(fp, td); 3266 return (error); 3267 } 3268 3269 int 3270 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3271 { 3272 3273 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3274 uap->times, UIO_USERSPACE, uap->flag)); 3275 } 3276 3277 int 3278 kern_utimensat(struct thread *td, int fd, const char *path, 3279 enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg, 3280 int flag) 3281 { 3282 struct nameidata nd; 3283 struct timespec ts[2]; 3284 int error, flags; 3285 3286 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 3287 return (EINVAL); 3288 3289 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3290 return (error); 3291 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 3292 FOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0) | AUDITVNODE1, 3293 pathseg, path, fd, &cap_futimes_rights, td); 3294 if ((error = namei(&nd)) != 0) 3295 return (error); 3296 /* 3297 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3298 * POSIX states: 3299 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3300 * "Search permission is denied by a component of the path prefix." 3301 */ 3302 NDFREE(&nd, NDF_ONLY_PNBUF); 3303 if ((flags & UTIMENS_EXIT) == 0) 3304 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3305 vrele(nd.ni_vp); 3306 return (error); 3307 } 3308 3309 /* 3310 * Truncate a file given its path name. 3311 */ 3312 #ifndef _SYS_SYSPROTO_H_ 3313 struct truncate_args { 3314 char *path; 3315 int pad; 3316 off_t length; 3317 }; 3318 #endif 3319 int 3320 sys_truncate(struct thread *td, struct truncate_args *uap) 3321 { 3322 3323 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3324 } 3325 3326 int 3327 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3328 off_t length) 3329 { 3330 struct mount *mp; 3331 struct vnode *vp; 3332 void *rl_cookie; 3333 struct vattr vattr; 3334 struct nameidata nd; 3335 int error; 3336 3337 if (length < 0) 3338 return(EINVAL); 3339 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3340 if ((error = namei(&nd)) != 0) 3341 return (error); 3342 vp = nd.ni_vp; 3343 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3344 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3345 vn_rangelock_unlock(vp, rl_cookie); 3346 vrele(vp); 3347 return (error); 3348 } 3349 NDFREE(&nd, NDF_ONLY_PNBUF); 3350 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3351 if (vp->v_type == VDIR) 3352 error = EISDIR; 3353 #ifdef MAC 3354 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3355 } 3356 #endif 3357 else if ((error = vn_writechk(vp)) == 0 && 3358 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3359 VATTR_NULL(&vattr); 3360 vattr.va_size = length; 3361 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3362 } 3363 VOP_UNLOCK(vp); 3364 vn_finished_write(mp); 3365 vn_rangelock_unlock(vp, rl_cookie); 3366 vrele(vp); 3367 return (error); 3368 } 3369 3370 #if defined(COMPAT_43) 3371 /* 3372 * Truncate a file given its path name. 3373 */ 3374 #ifndef _SYS_SYSPROTO_H_ 3375 struct otruncate_args { 3376 char *path; 3377 long length; 3378 }; 3379 #endif 3380 int 3381 otruncate(struct thread *td, struct otruncate_args *uap) 3382 { 3383 3384 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3385 } 3386 #endif /* COMPAT_43 */ 3387 3388 #if defined(COMPAT_FREEBSD6) 3389 /* Versions with the pad argument */ 3390 int 3391 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3392 { 3393 3394 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3395 } 3396 3397 int 3398 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3399 { 3400 3401 return (kern_ftruncate(td, uap->fd, uap->length)); 3402 } 3403 #endif 3404 3405 int 3406 kern_fsync(struct thread *td, int fd, bool fullsync) 3407 { 3408 struct vnode *vp; 3409 struct mount *mp; 3410 struct file *fp; 3411 int error, lock_flags; 3412 3413 AUDIT_ARG_FD(fd); 3414 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3415 if (error != 0) 3416 return (error); 3417 vp = fp->f_vnode; 3418 #if 0 3419 if (!fullsync) 3420 /* XXXKIB: compete outstanding aio writes */; 3421 #endif 3422 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3423 if (error != 0) 3424 goto drop; 3425 if (MNT_SHARED_WRITES(mp) || 3426 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3427 lock_flags = LK_SHARED; 3428 } else { 3429 lock_flags = LK_EXCLUSIVE; 3430 } 3431 vn_lock(vp, lock_flags | LK_RETRY); 3432 AUDIT_ARG_VNODE1(vp); 3433 if (vp->v_object != NULL) { 3434 VM_OBJECT_WLOCK(vp->v_object); 3435 vm_object_page_clean(vp->v_object, 0, 0, 0); 3436 VM_OBJECT_WUNLOCK(vp->v_object); 3437 } 3438 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3439 VOP_UNLOCK(vp); 3440 vn_finished_write(mp); 3441 drop: 3442 fdrop(fp, td); 3443 return (error); 3444 } 3445 3446 /* 3447 * Sync an open file. 3448 */ 3449 #ifndef _SYS_SYSPROTO_H_ 3450 struct fsync_args { 3451 int fd; 3452 }; 3453 #endif 3454 int 3455 sys_fsync(struct thread *td, struct fsync_args *uap) 3456 { 3457 3458 return (kern_fsync(td, uap->fd, true)); 3459 } 3460 3461 int 3462 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3463 { 3464 3465 return (kern_fsync(td, uap->fd, false)); 3466 } 3467 3468 /* 3469 * Rename files. Source and destination must either both be directories, or 3470 * both not be directories. If target is a directory, it must be empty. 3471 */ 3472 #ifndef _SYS_SYSPROTO_H_ 3473 struct rename_args { 3474 char *from; 3475 char *to; 3476 }; 3477 #endif 3478 int 3479 sys_rename(struct thread *td, struct rename_args *uap) 3480 { 3481 3482 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3483 uap->to, UIO_USERSPACE)); 3484 } 3485 3486 #ifndef _SYS_SYSPROTO_H_ 3487 struct renameat_args { 3488 int oldfd; 3489 char *old; 3490 int newfd; 3491 char *new; 3492 }; 3493 #endif 3494 int 3495 sys_renameat(struct thread *td, struct renameat_args *uap) 3496 { 3497 3498 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3499 UIO_USERSPACE)); 3500 } 3501 3502 int 3503 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3504 const char *new, enum uio_seg pathseg) 3505 { 3506 struct mount *mp = NULL; 3507 struct vnode *tvp, *fvp, *tdvp; 3508 struct nameidata fromnd, tond; 3509 int error; 3510 3511 again: 3512 bwillwrite(); 3513 #ifdef MAC 3514 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3515 AUDITVNODE1, pathseg, old, oldfd, 3516 &cap_renameat_source_rights, td); 3517 #else 3518 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3519 pathseg, old, oldfd, 3520 &cap_renameat_source_rights, td); 3521 #endif 3522 3523 if ((error = namei(&fromnd)) != 0) 3524 return (error); 3525 #ifdef MAC 3526 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3527 fromnd.ni_vp, &fromnd.ni_cnd); 3528 VOP_UNLOCK(fromnd.ni_dvp); 3529 if (fromnd.ni_dvp != fromnd.ni_vp) 3530 VOP_UNLOCK(fromnd.ni_vp); 3531 #endif 3532 fvp = fromnd.ni_vp; 3533 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3534 SAVESTART | AUDITVNODE2, pathseg, new, newfd, 3535 &cap_renameat_target_rights, td); 3536 if (fromnd.ni_vp->v_type == VDIR) 3537 tond.ni_cnd.cn_flags |= WILLBEDIR; 3538 if ((error = namei(&tond)) != 0) { 3539 /* Translate error code for rename("dir1", "dir2/."). */ 3540 if (error == EISDIR && fvp->v_type == VDIR) 3541 error = EINVAL; 3542 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3543 vrele(fromnd.ni_dvp); 3544 vrele(fvp); 3545 goto out1; 3546 } 3547 tdvp = tond.ni_dvp; 3548 tvp = tond.ni_vp; 3549 error = vn_start_write(fvp, &mp, V_NOWAIT); 3550 if (error != 0) { 3551 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3552 NDFREE(&tond, NDF_ONLY_PNBUF); 3553 if (tvp != NULL) 3554 vput(tvp); 3555 if (tdvp == tvp) 3556 vrele(tdvp); 3557 else 3558 vput(tdvp); 3559 vrele(fromnd.ni_dvp); 3560 vrele(fvp); 3561 vrele(tond.ni_startdir); 3562 if (fromnd.ni_startdir != NULL) 3563 vrele(fromnd.ni_startdir); 3564 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3565 if (error != 0) 3566 return (error); 3567 goto again; 3568 } 3569 if (tvp != NULL) { 3570 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3571 error = ENOTDIR; 3572 goto out; 3573 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3574 error = EISDIR; 3575 goto out; 3576 } 3577 #ifdef CAPABILITIES 3578 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3579 /* 3580 * If the target already exists we require CAP_UNLINKAT 3581 * from 'newfd', when newfd was used for the lookup. 3582 */ 3583 error = cap_check(&tond.ni_filecaps.fc_rights, 3584 &cap_unlinkat_rights); 3585 if (error != 0) 3586 goto out; 3587 } 3588 #endif 3589 } 3590 if (fvp == tdvp) { 3591 error = EINVAL; 3592 goto out; 3593 } 3594 /* 3595 * If the source is the same as the destination (that is, if they 3596 * are links to the same vnode), then there is nothing to do. 3597 */ 3598 if (fvp == tvp) 3599 error = -1; 3600 #ifdef MAC 3601 else 3602 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3603 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3604 #endif 3605 out: 3606 if (error == 0) { 3607 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3608 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3609 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3610 NDFREE(&tond, NDF_ONLY_PNBUF); 3611 } else { 3612 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3613 NDFREE(&tond, NDF_ONLY_PNBUF); 3614 if (tvp != NULL) 3615 vput(tvp); 3616 if (tdvp == tvp) 3617 vrele(tdvp); 3618 else 3619 vput(tdvp); 3620 vrele(fromnd.ni_dvp); 3621 vrele(fvp); 3622 } 3623 vrele(tond.ni_startdir); 3624 vn_finished_write(mp); 3625 out1: 3626 if (fromnd.ni_startdir) 3627 vrele(fromnd.ni_startdir); 3628 if (error == -1) 3629 return (0); 3630 return (error); 3631 } 3632 3633 /* 3634 * Make a directory file. 3635 */ 3636 #ifndef _SYS_SYSPROTO_H_ 3637 struct mkdir_args { 3638 char *path; 3639 int mode; 3640 }; 3641 #endif 3642 int 3643 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3644 { 3645 3646 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3647 uap->mode)); 3648 } 3649 3650 #ifndef _SYS_SYSPROTO_H_ 3651 struct mkdirat_args { 3652 int fd; 3653 char *path; 3654 mode_t mode; 3655 }; 3656 #endif 3657 int 3658 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3659 { 3660 3661 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3662 } 3663 3664 int 3665 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3666 int mode) 3667 { 3668 struct mount *mp; 3669 struct vnode *vp; 3670 struct vattr vattr; 3671 struct nameidata nd; 3672 int error; 3673 3674 AUDIT_ARG_MODE(mode); 3675 restart: 3676 bwillwrite(); 3677 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3678 NOCACHE, segflg, path, fd, &cap_mkdirat_rights, 3679 td); 3680 nd.ni_cnd.cn_flags |= WILLBEDIR; 3681 if ((error = namei(&nd)) != 0) 3682 return (error); 3683 vp = nd.ni_vp; 3684 if (vp != NULL) { 3685 NDFREE(&nd, NDF_ONLY_PNBUF); 3686 /* 3687 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3688 * the strange behaviour of leaving the vnode unlocked 3689 * if the target is the same vnode as the parent. 3690 */ 3691 if (vp == nd.ni_dvp) 3692 vrele(nd.ni_dvp); 3693 else 3694 vput(nd.ni_dvp); 3695 vrele(vp); 3696 return (EEXIST); 3697 } 3698 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3699 NDFREE(&nd, NDF_ONLY_PNBUF); 3700 vput(nd.ni_dvp); 3701 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3702 return (error); 3703 goto restart; 3704 } 3705 VATTR_NULL(&vattr); 3706 vattr.va_type = VDIR; 3707 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3708 #ifdef MAC 3709 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3710 &vattr); 3711 if (error != 0) 3712 goto out; 3713 #endif 3714 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3715 #ifdef MAC 3716 out: 3717 #endif 3718 NDFREE(&nd, NDF_ONLY_PNBUF); 3719 vput(nd.ni_dvp); 3720 if (error == 0) 3721 vput(nd.ni_vp); 3722 vn_finished_write(mp); 3723 return (error); 3724 } 3725 3726 /* 3727 * Remove a directory file. 3728 */ 3729 #ifndef _SYS_SYSPROTO_H_ 3730 struct rmdir_args { 3731 char *path; 3732 }; 3733 #endif 3734 int 3735 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3736 { 3737 3738 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3739 0)); 3740 } 3741 3742 int 3743 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3744 enum uio_seg pathseg, int flag) 3745 { 3746 struct mount *mp; 3747 struct vnode *vp; 3748 struct file *fp; 3749 struct nameidata nd; 3750 cap_rights_t rights; 3751 int error; 3752 3753 fp = NULL; 3754 if (fd != FD_NONE) { 3755 error = getvnode(td, fd, cap_rights_init(&rights, CAP_LOOKUP), 3756 &fp); 3757 if (error != 0) 3758 return (error); 3759 } 3760 3761 restart: 3762 bwillwrite(); 3763 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3764 ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 3765 pathseg, path, dfd, &cap_unlinkat_rights, td); 3766 if ((error = namei(&nd)) != 0) 3767 goto fdout; 3768 vp = nd.ni_vp; 3769 if (vp->v_type != VDIR) { 3770 error = ENOTDIR; 3771 goto out; 3772 } 3773 /* 3774 * No rmdir "." please. 3775 */ 3776 if (nd.ni_dvp == vp) { 3777 error = EINVAL; 3778 goto out; 3779 } 3780 /* 3781 * The root of a mounted filesystem cannot be deleted. 3782 */ 3783 if (vp->v_vflag & VV_ROOT) { 3784 error = EBUSY; 3785 goto out; 3786 } 3787 3788 if (fp != NULL && fp->f_vnode != vp) { 3789 if (VN_IS_DOOMED(fp->f_vnode)) 3790 error = EBADF; 3791 else 3792 error = EDEADLK; 3793 goto out; 3794 } 3795 3796 #ifdef MAC 3797 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3798 &nd.ni_cnd); 3799 if (error != 0) 3800 goto out; 3801 #endif 3802 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3803 NDFREE(&nd, NDF_ONLY_PNBUF); 3804 vput(vp); 3805 if (nd.ni_dvp == vp) 3806 vrele(nd.ni_dvp); 3807 else 3808 vput(nd.ni_dvp); 3809 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3810 goto fdout; 3811 goto restart; 3812 } 3813 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3814 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3815 vn_finished_write(mp); 3816 out: 3817 NDFREE(&nd, NDF_ONLY_PNBUF); 3818 vput(vp); 3819 if (nd.ni_dvp == vp) 3820 vrele(nd.ni_dvp); 3821 else 3822 vput(nd.ni_dvp); 3823 fdout: 3824 if (fp != NULL) 3825 fdrop(fp, td); 3826 return (error); 3827 } 3828 3829 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3830 int 3831 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3832 long *basep, void (*func)(struct freebsd11_dirent *)) 3833 { 3834 struct freebsd11_dirent dstdp; 3835 struct dirent *dp, *edp; 3836 char *dirbuf; 3837 off_t base; 3838 ssize_t resid, ucount; 3839 int error; 3840 3841 /* XXX arbitrary sanity limit on `count'. */ 3842 count = min(count, 64 * 1024); 3843 3844 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3845 3846 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3847 UIO_SYSSPACE); 3848 if (error != 0) 3849 goto done; 3850 if (basep != NULL) 3851 *basep = base; 3852 3853 ucount = 0; 3854 for (dp = (struct dirent *)dirbuf, 3855 edp = (struct dirent *)&dirbuf[count - resid]; 3856 ucount < count && dp < edp; ) { 3857 if (dp->d_reclen == 0) 3858 break; 3859 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3860 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3861 continue; 3862 dstdp.d_type = dp->d_type; 3863 dstdp.d_namlen = dp->d_namlen; 3864 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3865 if (dstdp.d_fileno != dp->d_fileno) { 3866 switch (ino64_trunc_error) { 3867 default: 3868 case 0: 3869 break; 3870 case 1: 3871 error = EOVERFLOW; 3872 goto done; 3873 case 2: 3874 dstdp.d_fileno = UINT32_MAX; 3875 break; 3876 } 3877 } 3878 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3879 ((dp->d_namlen + 1 + 3) &~ 3); 3880 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3881 bzero(dstdp.d_name + dstdp.d_namlen, 3882 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3883 dstdp.d_namlen); 3884 MPASS(dstdp.d_reclen <= dp->d_reclen); 3885 MPASS(ucount + dstdp.d_reclen <= count); 3886 if (func != NULL) 3887 func(&dstdp); 3888 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3889 if (error != 0) 3890 break; 3891 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3892 ucount += dstdp.d_reclen; 3893 } 3894 3895 done: 3896 free(dirbuf, M_TEMP); 3897 if (error == 0) 3898 td->td_retval[0] = ucount; 3899 return (error); 3900 } 3901 #endif /* COMPAT */ 3902 3903 #ifdef COMPAT_43 3904 static void 3905 ogetdirentries_cvt(struct freebsd11_dirent *dp) 3906 { 3907 #if (BYTE_ORDER == LITTLE_ENDIAN) 3908 /* 3909 * The expected low byte of dp->d_namlen is our dp->d_type. 3910 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 3911 */ 3912 dp->d_type = dp->d_namlen; 3913 dp->d_namlen = 0; 3914 #else 3915 /* 3916 * The dp->d_type is the high byte of the expected dp->d_namlen, 3917 * so must be zero'ed. 3918 */ 3919 dp->d_type = 0; 3920 #endif 3921 } 3922 3923 /* 3924 * Read a block of directory entries in a filesystem independent format. 3925 */ 3926 #ifndef _SYS_SYSPROTO_H_ 3927 struct ogetdirentries_args { 3928 int fd; 3929 char *buf; 3930 u_int count; 3931 long *basep; 3932 }; 3933 #endif 3934 int 3935 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3936 { 3937 long loff; 3938 int error; 3939 3940 error = kern_ogetdirentries(td, uap, &loff); 3941 if (error == 0) 3942 error = copyout(&loff, uap->basep, sizeof(long)); 3943 return (error); 3944 } 3945 3946 int 3947 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3948 long *ploff) 3949 { 3950 long base; 3951 int error; 3952 3953 /* XXX arbitrary sanity limit on `count'. */ 3954 if (uap->count > 64 * 1024) 3955 return (EINVAL); 3956 3957 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3958 &base, ogetdirentries_cvt); 3959 3960 if (error == 0 && uap->basep != NULL) 3961 error = copyout(&base, uap->basep, sizeof(long)); 3962 3963 return (error); 3964 } 3965 #endif /* COMPAT_43 */ 3966 3967 #if defined(COMPAT_FREEBSD11) 3968 #ifndef _SYS_SYSPROTO_H_ 3969 struct freebsd11_getdirentries_args { 3970 int fd; 3971 char *buf; 3972 u_int count; 3973 long *basep; 3974 }; 3975 #endif 3976 int 3977 freebsd11_getdirentries(struct thread *td, 3978 struct freebsd11_getdirentries_args *uap) 3979 { 3980 long base; 3981 int error; 3982 3983 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3984 &base, NULL); 3985 3986 if (error == 0 && uap->basep != NULL) 3987 error = copyout(&base, uap->basep, sizeof(long)); 3988 return (error); 3989 } 3990 3991 int 3992 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 3993 { 3994 struct freebsd11_getdirentries_args ap; 3995 3996 ap.fd = uap->fd; 3997 ap.buf = uap->buf; 3998 ap.count = uap->count; 3999 ap.basep = NULL; 4000 return (freebsd11_getdirentries(td, &ap)); 4001 } 4002 #endif /* COMPAT_FREEBSD11 */ 4003 4004 /* 4005 * Read a block of directory entries in a filesystem independent format. 4006 */ 4007 int 4008 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4009 { 4010 off_t base; 4011 int error; 4012 4013 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4014 NULL, UIO_USERSPACE); 4015 if (error != 0) 4016 return (error); 4017 if (uap->basep != NULL) 4018 error = copyout(&base, uap->basep, sizeof(off_t)); 4019 return (error); 4020 } 4021 4022 int 4023 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4024 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4025 { 4026 struct vnode *vp; 4027 struct file *fp; 4028 struct uio auio; 4029 struct iovec aiov; 4030 off_t loff; 4031 int error, eofflag; 4032 off_t foffset; 4033 4034 AUDIT_ARG_FD(fd); 4035 if (count > IOSIZE_MAX) 4036 return (EINVAL); 4037 auio.uio_resid = count; 4038 error = getvnode(td, fd, &cap_read_rights, &fp); 4039 if (error != 0) 4040 return (error); 4041 if ((fp->f_flag & FREAD) == 0) { 4042 fdrop(fp, td); 4043 return (EBADF); 4044 } 4045 vp = fp->f_vnode; 4046 foffset = foffset_lock(fp, 0); 4047 unionread: 4048 if (vp->v_type != VDIR) { 4049 error = EINVAL; 4050 goto fail; 4051 } 4052 aiov.iov_base = buf; 4053 aiov.iov_len = count; 4054 auio.uio_iov = &aiov; 4055 auio.uio_iovcnt = 1; 4056 auio.uio_rw = UIO_READ; 4057 auio.uio_segflg = bufseg; 4058 auio.uio_td = td; 4059 vn_lock(vp, LK_SHARED | LK_RETRY); 4060 AUDIT_ARG_VNODE1(vp); 4061 loff = auio.uio_offset = foffset; 4062 #ifdef MAC 4063 error = mac_vnode_check_readdir(td->td_ucred, vp); 4064 if (error == 0) 4065 #endif 4066 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4067 NULL); 4068 foffset = auio.uio_offset; 4069 if (error != 0) { 4070 VOP_UNLOCK(vp); 4071 goto fail; 4072 } 4073 if (count == auio.uio_resid && 4074 (vp->v_vflag & VV_ROOT) && 4075 (vp->v_mount->mnt_flag & MNT_UNION)) { 4076 struct vnode *tvp = vp; 4077 4078 vp = vp->v_mount->mnt_vnodecovered; 4079 VREF(vp); 4080 fp->f_vnode = vp; 4081 fp->f_data = vp; 4082 foffset = 0; 4083 vput(tvp); 4084 goto unionread; 4085 } 4086 VOP_UNLOCK(vp); 4087 *basep = loff; 4088 if (residp != NULL) 4089 *residp = auio.uio_resid; 4090 td->td_retval[0] = count - auio.uio_resid; 4091 fail: 4092 foffset_unlock(fp, foffset, 0); 4093 fdrop(fp, td); 4094 return (error); 4095 } 4096 4097 /* 4098 * Set the mode mask for creation of filesystem nodes. 4099 */ 4100 #ifndef _SYS_SYSPROTO_H_ 4101 struct umask_args { 4102 int newmask; 4103 }; 4104 #endif 4105 int 4106 sys_umask(struct thread *td, struct umask_args *uap) 4107 { 4108 struct filedesc *fdp; 4109 4110 fdp = td->td_proc->p_fd; 4111 FILEDESC_XLOCK(fdp); 4112 td->td_retval[0] = fdp->fd_cmask; 4113 fdp->fd_cmask = uap->newmask & ALLPERMS; 4114 FILEDESC_XUNLOCK(fdp); 4115 return (0); 4116 } 4117 4118 /* 4119 * Void all references to file by ripping underlying filesystem away from 4120 * vnode. 4121 */ 4122 #ifndef _SYS_SYSPROTO_H_ 4123 struct revoke_args { 4124 char *path; 4125 }; 4126 #endif 4127 int 4128 sys_revoke(struct thread *td, struct revoke_args *uap) 4129 { 4130 struct vnode *vp; 4131 struct vattr vattr; 4132 struct nameidata nd; 4133 int error; 4134 4135 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4136 uap->path, td); 4137 if ((error = namei(&nd)) != 0) 4138 return (error); 4139 vp = nd.ni_vp; 4140 NDFREE(&nd, NDF_ONLY_PNBUF); 4141 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4142 error = EINVAL; 4143 goto out; 4144 } 4145 #ifdef MAC 4146 error = mac_vnode_check_revoke(td->td_ucred, vp); 4147 if (error != 0) 4148 goto out; 4149 #endif 4150 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4151 if (error != 0) 4152 goto out; 4153 if (td->td_ucred->cr_uid != vattr.va_uid) { 4154 error = priv_check(td, PRIV_VFS_ADMIN); 4155 if (error != 0) 4156 goto out; 4157 } 4158 if (vp->v_usecount > 1 || vcount(vp) > 1) 4159 VOP_REVOKE(vp, REVOKEALL); 4160 out: 4161 vput(vp); 4162 return (error); 4163 } 4164 4165 /* 4166 * Convert a user file descriptor to a kernel file entry and check that, if it 4167 * is a capability, the correct rights are present. A reference on the file 4168 * entry is held upon returning. 4169 */ 4170 int 4171 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4172 { 4173 struct file *fp; 4174 int error; 4175 4176 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); 4177 if (error != 0) 4178 return (error); 4179 4180 /* 4181 * The file could be not of the vnode type, or it may be not 4182 * yet fully initialized, in which case the f_vnode pointer 4183 * may be set, but f_ops is still badfileops. E.g., 4184 * devfs_open() transiently create such situation to 4185 * facilitate csw d_fdopen(). 4186 * 4187 * Dupfdopen() handling in kern_openat() installs the 4188 * half-baked file into the process descriptor table, allowing 4189 * other thread to dereference it. Guard against the race by 4190 * checking f_ops. 4191 */ 4192 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4193 fdrop(fp, td); 4194 return (EINVAL); 4195 } 4196 *fpp = fp; 4197 return (0); 4198 } 4199 4200 4201 /* 4202 * Get an (NFS) file handle. 4203 */ 4204 #ifndef _SYS_SYSPROTO_H_ 4205 struct lgetfh_args { 4206 char *fname; 4207 fhandle_t *fhp; 4208 }; 4209 #endif 4210 int 4211 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4212 { 4213 4214 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4215 UIO_USERSPACE, uap->fhp)); 4216 } 4217 4218 #ifndef _SYS_SYSPROTO_H_ 4219 struct getfh_args { 4220 char *fname; 4221 fhandle_t *fhp; 4222 }; 4223 #endif 4224 int 4225 sys_getfh(struct thread *td, struct getfh_args *uap) 4226 { 4227 4228 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4229 uap->fhp)); 4230 } 4231 4232 /* 4233 * syscall for the rpc.lockd to use to translate an open descriptor into 4234 * a NFS file handle. 4235 * 4236 * warning: do not remove the priv_check() call or this becomes one giant 4237 * security hole. 4238 */ 4239 #ifndef _SYS_SYSPROTO_H_ 4240 struct getfhat_args { 4241 int fd; 4242 char *path; 4243 fhandle_t *fhp; 4244 int flags; 4245 }; 4246 #endif 4247 int 4248 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4249 { 4250 4251 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 4252 return (EINVAL); 4253 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4254 uap->fhp)); 4255 } 4256 4257 static int 4258 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4259 enum uio_seg pathseg, fhandle_t *fhp) 4260 { 4261 struct nameidata nd; 4262 fhandle_t fh; 4263 struct vnode *vp; 4264 int error; 4265 4266 error = priv_check(td, PRIV_VFS_GETFH); 4267 if (error != 0) 4268 return (error); 4269 NDINIT_AT(&nd, LOOKUP, ((flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 4270 FOLLOW) | ((flags & AT_BENEATH) != 0 ? BENEATH : 0) | LOCKLEAF | 4271 AUDITVNODE1, pathseg, path, fd, td); 4272 error = namei(&nd); 4273 if (error != 0) 4274 return (error); 4275 NDFREE(&nd, NDF_ONLY_PNBUF); 4276 vp = nd.ni_vp; 4277 bzero(&fh, sizeof(fh)); 4278 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4279 error = VOP_VPTOFH(vp, &fh.fh_fid); 4280 vput(vp); 4281 if (error == 0) 4282 error = copyout(&fh, fhp, sizeof (fh)); 4283 return (error); 4284 } 4285 4286 #ifndef _SYS_SYSPROTO_H_ 4287 struct fhlink_args { 4288 fhandle_t *fhp; 4289 const char *to; 4290 }; 4291 #endif 4292 int 4293 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4294 { 4295 4296 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4297 } 4298 4299 #ifndef _SYS_SYSPROTO_H_ 4300 struct fhlinkat_args { 4301 fhandle_t *fhp; 4302 int tofd; 4303 const char *to; 4304 }; 4305 #endif 4306 int 4307 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4308 { 4309 4310 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4311 } 4312 4313 static int 4314 kern_fhlinkat(struct thread *td, int fd, const char *path, 4315 enum uio_seg pathseg, fhandle_t *fhp) 4316 { 4317 fhandle_t fh; 4318 struct mount *mp; 4319 struct vnode *vp; 4320 int error; 4321 4322 error = priv_check(td, PRIV_VFS_GETFH); 4323 if (error != 0) 4324 return (error); 4325 error = copyin(fhp, &fh, sizeof(fh)); 4326 if (error != 0) 4327 return (error); 4328 do { 4329 bwillwrite(); 4330 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4331 return (ESTALE); 4332 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4333 vfs_unbusy(mp); 4334 if (error != 0) 4335 return (error); 4336 VOP_UNLOCK(vp); 4337 } while ((error = kern_linkat_vp(td, vp, fd, path, pathseg)) == EAGAIN); 4338 return (error); 4339 } 4340 4341 #ifndef _SYS_SYSPROTO_H_ 4342 struct fhreadlink_args { 4343 fhandle_t *fhp; 4344 char *buf; 4345 size_t bufsize; 4346 }; 4347 #endif 4348 int 4349 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4350 { 4351 fhandle_t fh; 4352 struct mount *mp; 4353 struct vnode *vp; 4354 int error; 4355 4356 error = priv_check(td, PRIV_VFS_GETFH); 4357 if (error != 0) 4358 return (error); 4359 if (uap->bufsize > IOSIZE_MAX) 4360 return (EINVAL); 4361 error = copyin(uap->fhp, &fh, sizeof(fh)); 4362 if (error != 0) 4363 return (error); 4364 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4365 return (ESTALE); 4366 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4367 vfs_unbusy(mp); 4368 if (error != 0) 4369 return (error); 4370 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4371 vput(vp); 4372 return (error); 4373 } 4374 4375 /* 4376 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4377 * open descriptor. 4378 * 4379 * warning: do not remove the priv_check() call or this becomes one giant 4380 * security hole. 4381 */ 4382 #ifndef _SYS_SYSPROTO_H_ 4383 struct fhopen_args { 4384 const struct fhandle *u_fhp; 4385 int flags; 4386 }; 4387 #endif 4388 int 4389 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4390 { 4391 struct mount *mp; 4392 struct vnode *vp; 4393 struct fhandle fhp; 4394 struct file *fp; 4395 int fmode, error; 4396 int indx; 4397 4398 error = priv_check(td, PRIV_VFS_FHOPEN); 4399 if (error != 0) 4400 return (error); 4401 indx = -1; 4402 fmode = FFLAGS(uap->flags); 4403 /* why not allow a non-read/write open for our lockd? */ 4404 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4405 return (EINVAL); 4406 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4407 if (error != 0) 4408 return(error); 4409 /* find the mount point */ 4410 mp = vfs_busyfs(&fhp.fh_fsid); 4411 if (mp == NULL) 4412 return (ESTALE); 4413 /* now give me my vnode, it gets returned to me locked */ 4414 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4415 vfs_unbusy(mp); 4416 if (error != 0) 4417 return (error); 4418 4419 error = falloc_noinstall(td, &fp); 4420 if (error != 0) { 4421 vput(vp); 4422 return (error); 4423 } 4424 /* 4425 * An extra reference on `fp' has been held for us by 4426 * falloc_noinstall(). 4427 */ 4428 4429 #ifdef INVARIANTS 4430 td->td_dupfd = -1; 4431 #endif 4432 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4433 if (error != 0) { 4434 KASSERT(fp->f_ops == &badfileops, 4435 ("VOP_OPEN in fhopen() set f_ops")); 4436 KASSERT(td->td_dupfd < 0, 4437 ("fhopen() encountered fdopen()")); 4438 4439 vput(vp); 4440 goto bad; 4441 } 4442 #ifdef INVARIANTS 4443 td->td_dupfd = 0; 4444 #endif 4445 fp->f_vnode = vp; 4446 fp->f_seqcount = 1; 4447 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp, 4448 &vnops); 4449 VOP_UNLOCK(vp); 4450 if ((fmode & O_TRUNC) != 0) { 4451 error = fo_truncate(fp, 0, td->td_ucred, td); 4452 if (error != 0) 4453 goto bad; 4454 } 4455 4456 error = finstall(td, fp, &indx, fmode, NULL); 4457 bad: 4458 fdrop(fp, td); 4459 td->td_retval[0] = indx; 4460 return (error); 4461 } 4462 4463 /* 4464 * Stat an (NFS) file handle. 4465 */ 4466 #ifndef _SYS_SYSPROTO_H_ 4467 struct fhstat_args { 4468 struct fhandle *u_fhp; 4469 struct stat *sb; 4470 }; 4471 #endif 4472 int 4473 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4474 { 4475 struct stat sb; 4476 struct fhandle fh; 4477 int error; 4478 4479 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4480 if (error != 0) 4481 return (error); 4482 error = kern_fhstat(td, fh, &sb); 4483 if (error == 0) 4484 error = copyout(&sb, uap->sb, sizeof(sb)); 4485 return (error); 4486 } 4487 4488 int 4489 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4490 { 4491 struct mount *mp; 4492 struct vnode *vp; 4493 int error; 4494 4495 error = priv_check(td, PRIV_VFS_FHSTAT); 4496 if (error != 0) 4497 return (error); 4498 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4499 return (ESTALE); 4500 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4501 vfs_unbusy(mp); 4502 if (error != 0) 4503 return (error); 4504 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td); 4505 vput(vp); 4506 return (error); 4507 } 4508 4509 /* 4510 * Implement fstatfs() for (NFS) file handles. 4511 */ 4512 #ifndef _SYS_SYSPROTO_H_ 4513 struct fhstatfs_args { 4514 struct fhandle *u_fhp; 4515 struct statfs *buf; 4516 }; 4517 #endif 4518 int 4519 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4520 { 4521 struct statfs *sfp; 4522 fhandle_t fh; 4523 int error; 4524 4525 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4526 if (error != 0) 4527 return (error); 4528 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4529 error = kern_fhstatfs(td, fh, sfp); 4530 if (error == 0) 4531 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4532 free(sfp, M_STATFS); 4533 return (error); 4534 } 4535 4536 int 4537 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4538 { 4539 struct mount *mp; 4540 struct vnode *vp; 4541 int error; 4542 4543 error = priv_check(td, PRIV_VFS_FHSTATFS); 4544 if (error != 0) 4545 return (error); 4546 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4547 return (ESTALE); 4548 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4549 if (error != 0) { 4550 vfs_unbusy(mp); 4551 return (error); 4552 } 4553 vput(vp); 4554 error = prison_canseemount(td->td_ucred, mp); 4555 if (error != 0) 4556 goto out; 4557 #ifdef MAC 4558 error = mac_mount_check_stat(td->td_ucred, mp); 4559 if (error != 0) 4560 goto out; 4561 #endif 4562 error = VFS_STATFS(mp, buf); 4563 out: 4564 vfs_unbusy(mp); 4565 return (error); 4566 } 4567 4568 /* 4569 * Unlike madvise(2), we do not make a best effort to remember every 4570 * possible caching hint. Instead, we remember the last setting with 4571 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4572 * region of any current setting. 4573 */ 4574 int 4575 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4576 int advice) 4577 { 4578 struct fadvise_info *fa, *new; 4579 struct file *fp; 4580 struct vnode *vp; 4581 off_t end; 4582 int error; 4583 4584 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4585 return (EINVAL); 4586 AUDIT_ARG_VALUE(advice); 4587 switch (advice) { 4588 case POSIX_FADV_SEQUENTIAL: 4589 case POSIX_FADV_RANDOM: 4590 case POSIX_FADV_NOREUSE: 4591 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4592 break; 4593 case POSIX_FADV_NORMAL: 4594 case POSIX_FADV_WILLNEED: 4595 case POSIX_FADV_DONTNEED: 4596 new = NULL; 4597 break; 4598 default: 4599 return (EINVAL); 4600 } 4601 /* XXX: CAP_POSIX_FADVISE? */ 4602 AUDIT_ARG_FD(fd); 4603 error = fget(td, fd, &cap_no_rights, &fp); 4604 if (error != 0) 4605 goto out; 4606 AUDIT_ARG_FILE(td->td_proc, fp); 4607 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4608 error = ESPIPE; 4609 goto out; 4610 } 4611 if (fp->f_type != DTYPE_VNODE) { 4612 error = ENODEV; 4613 goto out; 4614 } 4615 vp = fp->f_vnode; 4616 if (vp->v_type != VREG) { 4617 error = ENODEV; 4618 goto out; 4619 } 4620 if (len == 0) 4621 end = OFF_MAX; 4622 else 4623 end = offset + len - 1; 4624 switch (advice) { 4625 case POSIX_FADV_SEQUENTIAL: 4626 case POSIX_FADV_RANDOM: 4627 case POSIX_FADV_NOREUSE: 4628 /* 4629 * Try to merge any existing non-standard region with 4630 * this new region if possible, otherwise create a new 4631 * non-standard region for this request. 4632 */ 4633 mtx_pool_lock(mtxpool_sleep, fp); 4634 fa = fp->f_advice; 4635 if (fa != NULL && fa->fa_advice == advice && 4636 ((fa->fa_start <= end && fa->fa_end >= offset) || 4637 (end != OFF_MAX && fa->fa_start == end + 1) || 4638 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4639 if (offset < fa->fa_start) 4640 fa->fa_start = offset; 4641 if (end > fa->fa_end) 4642 fa->fa_end = end; 4643 } else { 4644 new->fa_advice = advice; 4645 new->fa_start = offset; 4646 new->fa_end = end; 4647 fp->f_advice = new; 4648 new = fa; 4649 } 4650 mtx_pool_unlock(mtxpool_sleep, fp); 4651 break; 4652 case POSIX_FADV_NORMAL: 4653 /* 4654 * If a the "normal" region overlaps with an existing 4655 * non-standard region, trim or remove the 4656 * non-standard region. 4657 */ 4658 mtx_pool_lock(mtxpool_sleep, fp); 4659 fa = fp->f_advice; 4660 if (fa != NULL) { 4661 if (offset <= fa->fa_start && end >= fa->fa_end) { 4662 new = fa; 4663 fp->f_advice = NULL; 4664 } else if (offset <= fa->fa_start && 4665 end >= fa->fa_start) 4666 fa->fa_start = end + 1; 4667 else if (offset <= fa->fa_end && end >= fa->fa_end) 4668 fa->fa_end = offset - 1; 4669 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4670 /* 4671 * If the "normal" region is a middle 4672 * portion of the existing 4673 * non-standard region, just remove 4674 * the whole thing rather than picking 4675 * one side or the other to 4676 * preserve. 4677 */ 4678 new = fa; 4679 fp->f_advice = NULL; 4680 } 4681 } 4682 mtx_pool_unlock(mtxpool_sleep, fp); 4683 break; 4684 case POSIX_FADV_WILLNEED: 4685 case POSIX_FADV_DONTNEED: 4686 error = VOP_ADVISE(vp, offset, end, advice); 4687 break; 4688 } 4689 out: 4690 if (fp != NULL) 4691 fdrop(fp, td); 4692 free(new, M_FADVISE); 4693 return (error); 4694 } 4695 4696 int 4697 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4698 { 4699 int error; 4700 4701 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4702 uap->advice); 4703 return (kern_posix_error(td, error)); 4704 } 4705 4706 int 4707 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 4708 off_t *outoffp, size_t len, unsigned int flags) 4709 { 4710 struct file *infp, *outfp; 4711 struct vnode *invp, *outvp; 4712 int error; 4713 size_t retlen; 4714 void *rl_rcookie, *rl_wcookie; 4715 off_t savinoff, savoutoff; 4716 4717 infp = outfp = NULL; 4718 rl_rcookie = rl_wcookie = NULL; 4719 savinoff = -1; 4720 error = 0; 4721 retlen = 0; 4722 4723 if (flags != 0) { 4724 error = EINVAL; 4725 goto out; 4726 } 4727 if (len > SSIZE_MAX) 4728 /* 4729 * Although the len argument is size_t, the return argument 4730 * is ssize_t (which is signed). Therefore a size that won't 4731 * fit in ssize_t can't be returned. 4732 */ 4733 len = SSIZE_MAX; 4734 4735 /* Get the file structures for the file descriptors. */ 4736 error = fget_read(td, infd, &cap_read_rights, &infp); 4737 if (error != 0) 4738 goto out; 4739 error = fget_write(td, outfd, &cap_write_rights, &outfp); 4740 if (error != 0) 4741 goto out; 4742 4743 /* Set the offset pointers to the correct place. */ 4744 if (inoffp == NULL) 4745 inoffp = &infp->f_offset; 4746 if (outoffp == NULL) 4747 outoffp = &outfp->f_offset; 4748 savinoff = *inoffp; 4749 savoutoff = *outoffp; 4750 4751 invp = infp->f_vnode; 4752 outvp = outfp->f_vnode; 4753 /* Sanity check the f_flag bits. */ 4754 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 4755 (infp->f_flag & FREAD) == 0) { 4756 error = EBADF; 4757 goto out; 4758 } 4759 4760 /* If len == 0, just return 0. */ 4761 if (len == 0) 4762 goto out; 4763 4764 /* 4765 * If infp and outfp refer to the same file, the byte ranges cannot 4766 * overlap. 4767 */ 4768 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len > 4769 savoutoff) || (savinoff > savoutoff && savoutoff + len > 4770 savinoff))) { 4771 error = EINVAL; 4772 goto out; 4773 } 4774 4775 /* Range lock the byte ranges for both invp and outvp. */ 4776 for (;;) { 4777 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp + 4778 len); 4779 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp + 4780 len); 4781 if (rl_rcookie != NULL) 4782 break; 4783 vn_rangelock_unlock(outvp, rl_wcookie); 4784 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len); 4785 vn_rangelock_unlock(invp, rl_rcookie); 4786 } 4787 4788 retlen = len; 4789 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen, 4790 flags, infp->f_cred, outfp->f_cred, td); 4791 out: 4792 if (rl_rcookie != NULL) 4793 vn_rangelock_unlock(invp, rl_rcookie); 4794 if (rl_wcookie != NULL) 4795 vn_rangelock_unlock(outvp, rl_wcookie); 4796 if (savinoff != -1 && (error == EINTR || error == ERESTART)) { 4797 *inoffp = savinoff; 4798 *outoffp = savoutoff; 4799 } 4800 if (outfp != NULL) 4801 fdrop(outfp, td); 4802 if (infp != NULL) 4803 fdrop(infp, td); 4804 td->td_retval[0] = retlen; 4805 return (error); 4806 } 4807 4808 int 4809 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 4810 { 4811 off_t inoff, outoff, *inoffp, *outoffp; 4812 int error; 4813 4814 inoffp = outoffp = NULL; 4815 if (uap->inoffp != NULL) { 4816 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 4817 if (error != 0) 4818 return (error); 4819 inoffp = &inoff; 4820 } 4821 if (uap->outoffp != NULL) { 4822 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 4823 if (error != 0) 4824 return (error); 4825 outoffp = &outoff; 4826 } 4827 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 4828 outoffp, uap->len, uap->flags); 4829 if (error == 0 && uap->inoffp != NULL) 4830 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 4831 if (error == 0 && uap->outoffp != NULL) 4832 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 4833 return (error); 4834 } 4835