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 if (error != 0) { 193 vfs_rel(mp); 194 return (error); 195 } 196 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); 197 198 /* 199 * Since quota on operation typically needs to open quota 200 * file, the Q_QUOTAON handler needs to unbusy the mount point 201 * before calling into namei. Otherwise, unmount might be 202 * started between two vfs_busy() invocations (first is our, 203 * second is from mount point cross-walk code in lookup()), 204 * causing deadlock. 205 * 206 * Require that Q_QUOTAON handles the vfs_busy() reference on 207 * its own, always returning with ubusied mount point. 208 */ 209 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON && 210 (uap->cmd >> SUBCMDSHIFT) != Q_QUOTAOFF) 211 vfs_unbusy(mp); 212 vfs_rel(mp); 213 return (error); 214 } 215 216 /* 217 * Used by statfs conversion routines to scale the block size up if 218 * necessary so that all of the block counts are <= 'max_size'. Note 219 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 220 * value of 'n'. 221 */ 222 void 223 statfs_scale_blocks(struct statfs *sf, long max_size) 224 { 225 uint64_t count; 226 int shift; 227 228 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 229 230 /* 231 * Attempt to scale the block counts to give a more accurate 232 * overview to userland of the ratio of free space to used 233 * space. To do this, find the largest block count and compute 234 * a divisor that lets it fit into a signed integer <= max_size. 235 */ 236 if (sf->f_bavail < 0) 237 count = -sf->f_bavail; 238 else 239 count = sf->f_bavail; 240 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 241 if (count <= max_size) 242 return; 243 244 count >>= flsl(max_size); 245 shift = 0; 246 while (count > 0) { 247 shift++; 248 count >>=1; 249 } 250 251 sf->f_bsize <<= shift; 252 sf->f_blocks >>= shift; 253 sf->f_bfree >>= shift; 254 sf->f_bavail >>= shift; 255 } 256 257 static int 258 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 259 { 260 int error; 261 262 if (mp == NULL) 263 return (EBADF); 264 error = vfs_busy(mp, 0); 265 vfs_rel(mp); 266 if (error != 0) 267 return (error); 268 #ifdef MAC 269 error = mac_mount_check_stat(td->td_ucred, mp); 270 if (error != 0) 271 goto out; 272 #endif 273 error = VFS_STATFS(mp, buf); 274 if (error != 0) 275 goto out; 276 if (priv_check(td, PRIV_VFS_GENERATION)) { 277 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 278 prison_enforce_statfs(td->td_ucred, mp, buf); 279 } 280 out: 281 vfs_unbusy(mp); 282 return (error); 283 } 284 285 /* 286 * Get filesystem statistics. 287 */ 288 #ifndef _SYS_SYSPROTO_H_ 289 struct statfs_args { 290 char *path; 291 struct statfs *buf; 292 }; 293 #endif 294 int 295 sys_statfs(struct thread *td, struct statfs_args *uap) 296 { 297 struct statfs *sfp; 298 int error; 299 300 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 301 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 302 if (error == 0) 303 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 304 free(sfp, M_STATFS); 305 return (error); 306 } 307 308 int 309 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg, 310 struct statfs *buf) 311 { 312 struct mount *mp; 313 struct nameidata nd; 314 int error; 315 316 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 317 pathseg, path, td); 318 error = namei(&nd); 319 if (error != 0) 320 return (error); 321 mp = nd.ni_vp->v_mount; 322 vfs_ref(mp); 323 NDFREE(&nd, NDF_ONLY_PNBUF); 324 vput(nd.ni_vp); 325 return (kern_do_statfs(td, mp, buf)); 326 } 327 328 /* 329 * Get filesystem statistics. 330 */ 331 #ifndef _SYS_SYSPROTO_H_ 332 struct fstatfs_args { 333 int fd; 334 struct statfs *buf; 335 }; 336 #endif 337 int 338 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 339 { 340 struct statfs *sfp; 341 int error; 342 343 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 344 error = kern_fstatfs(td, uap->fd, sfp); 345 if (error == 0) 346 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 347 free(sfp, M_STATFS); 348 return (error); 349 } 350 351 int 352 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 353 { 354 struct file *fp; 355 struct mount *mp; 356 struct vnode *vp; 357 int error; 358 359 AUDIT_ARG_FD(fd); 360 error = getvnode(td, fd, &cap_fstatfs_rights, &fp); 361 if (error != 0) 362 return (error); 363 vp = fp->f_vnode; 364 vn_lock(vp, LK_SHARED | LK_RETRY); 365 #ifdef AUDIT 366 AUDIT_ARG_VNODE1(vp); 367 #endif 368 mp = vp->v_mount; 369 if (mp != NULL) 370 vfs_ref(mp); 371 VOP_UNLOCK(vp); 372 fdrop(fp, td); 373 return (kern_do_statfs(td, mp, buf)); 374 } 375 376 /* 377 * Get statistics on all filesystems. 378 */ 379 #ifndef _SYS_SYSPROTO_H_ 380 struct getfsstat_args { 381 struct statfs *buf; 382 long bufsize; 383 int mode; 384 }; 385 #endif 386 int 387 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 388 { 389 size_t count; 390 int error; 391 392 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 393 return (EINVAL); 394 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 395 UIO_USERSPACE, uap->mode); 396 if (error == 0) 397 td->td_retval[0] = count; 398 return (error); 399 } 400 401 /* 402 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 403 * The caller is responsible for freeing memory which will be allocated 404 * in '*buf'. 405 */ 406 int 407 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 408 size_t *countp, enum uio_seg bufseg, int mode) 409 { 410 struct mount *mp, *nmp; 411 struct statfs *sfsp, *sp, *sptmp, *tofree; 412 size_t count, maxcount; 413 int error; 414 415 switch (mode) { 416 case MNT_WAIT: 417 case MNT_NOWAIT: 418 break; 419 default: 420 if (bufseg == UIO_SYSSPACE) 421 *buf = NULL; 422 return (EINVAL); 423 } 424 restart: 425 maxcount = bufsize / sizeof(struct statfs); 426 if (bufsize == 0) { 427 sfsp = NULL; 428 tofree = NULL; 429 } else if (bufseg == UIO_USERSPACE) { 430 sfsp = *buf; 431 tofree = NULL; 432 } else /* if (bufseg == UIO_SYSSPACE) */ { 433 count = 0; 434 mtx_lock(&mountlist_mtx); 435 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 436 count++; 437 } 438 mtx_unlock(&mountlist_mtx); 439 if (maxcount > count) 440 maxcount = count; 441 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 442 M_STATFS, M_WAITOK); 443 } 444 count = 0; 445 mtx_lock(&mountlist_mtx); 446 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 447 if (prison_canseemount(td->td_ucred, mp) != 0) { 448 nmp = TAILQ_NEXT(mp, mnt_list); 449 continue; 450 } 451 #ifdef MAC 452 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 453 nmp = TAILQ_NEXT(mp, mnt_list); 454 continue; 455 } 456 #endif 457 if (mode == MNT_WAIT) { 458 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 459 /* 460 * If vfs_busy() failed, and MBF_NOWAIT 461 * wasn't passed, then the mp is gone. 462 * Furthermore, because of MBF_MNTLSTLOCK, 463 * the mountlist_mtx was dropped. We have 464 * no other choice than to start over. 465 */ 466 mtx_unlock(&mountlist_mtx); 467 free(tofree, M_STATFS); 468 goto restart; 469 } 470 } else { 471 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 472 nmp = TAILQ_NEXT(mp, mnt_list); 473 continue; 474 } 475 } 476 if (sfsp != NULL && count < maxcount) { 477 sp = &mp->mnt_stat; 478 /* 479 * If MNT_NOWAIT is specified, do not refresh 480 * the fsstat cache. 481 */ 482 if (mode != MNT_NOWAIT) { 483 error = VFS_STATFS(mp, sp); 484 if (error != 0) { 485 mtx_lock(&mountlist_mtx); 486 nmp = TAILQ_NEXT(mp, mnt_list); 487 vfs_unbusy(mp); 488 continue; 489 } 490 } 491 if (priv_check(td, PRIV_VFS_GENERATION)) { 492 sptmp = malloc(sizeof(struct statfs), M_STATFS, 493 M_WAITOK); 494 *sptmp = *sp; 495 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 496 prison_enforce_statfs(td->td_ucred, mp, sptmp); 497 sp = sptmp; 498 } else 499 sptmp = NULL; 500 if (bufseg == UIO_SYSSPACE) { 501 bcopy(sp, sfsp, sizeof(*sp)); 502 free(sptmp, M_STATFS); 503 } else /* if (bufseg == UIO_USERSPACE) */ { 504 error = copyout(sp, sfsp, sizeof(*sp)); 505 free(sptmp, M_STATFS); 506 if (error != 0) { 507 vfs_unbusy(mp); 508 return (error); 509 } 510 } 511 sfsp++; 512 } 513 count++; 514 mtx_lock(&mountlist_mtx); 515 nmp = TAILQ_NEXT(mp, mnt_list); 516 vfs_unbusy(mp); 517 } 518 mtx_unlock(&mountlist_mtx); 519 if (sfsp != NULL && count > maxcount) 520 *countp = maxcount; 521 else 522 *countp = count; 523 return (0); 524 } 525 526 #ifdef COMPAT_FREEBSD4 527 /* 528 * Get old format filesystem statistics. 529 */ 530 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 531 532 #ifndef _SYS_SYSPROTO_H_ 533 struct freebsd4_statfs_args { 534 char *path; 535 struct ostatfs *buf; 536 }; 537 #endif 538 int 539 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 540 { 541 struct ostatfs osb; 542 struct statfs *sfp; 543 int error; 544 545 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 546 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 547 if (error == 0) { 548 freebsd4_cvtstatfs(sfp, &osb); 549 error = copyout(&osb, uap->buf, sizeof(osb)); 550 } 551 free(sfp, M_STATFS); 552 return (error); 553 } 554 555 /* 556 * Get filesystem statistics. 557 */ 558 #ifndef _SYS_SYSPROTO_H_ 559 struct freebsd4_fstatfs_args { 560 int fd; 561 struct ostatfs *buf; 562 }; 563 #endif 564 int 565 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 566 { 567 struct ostatfs osb; 568 struct statfs *sfp; 569 int error; 570 571 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 572 error = kern_fstatfs(td, uap->fd, sfp); 573 if (error == 0) { 574 freebsd4_cvtstatfs(sfp, &osb); 575 error = copyout(&osb, uap->buf, sizeof(osb)); 576 } 577 free(sfp, M_STATFS); 578 return (error); 579 } 580 581 /* 582 * Get statistics on all filesystems. 583 */ 584 #ifndef _SYS_SYSPROTO_H_ 585 struct freebsd4_getfsstat_args { 586 struct ostatfs *buf; 587 long bufsize; 588 int mode; 589 }; 590 #endif 591 int 592 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 593 { 594 struct statfs *buf, *sp; 595 struct ostatfs osb; 596 size_t count, size; 597 int error; 598 599 if (uap->bufsize < 0) 600 return (EINVAL); 601 count = uap->bufsize / sizeof(struct ostatfs); 602 if (count > SIZE_MAX / sizeof(struct statfs)) 603 return (EINVAL); 604 size = count * sizeof(struct statfs); 605 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 606 uap->mode); 607 if (error == 0) 608 td->td_retval[0] = count; 609 if (size != 0) { 610 sp = buf; 611 while (count != 0 && error == 0) { 612 freebsd4_cvtstatfs(sp, &osb); 613 error = copyout(&osb, uap->buf, sizeof(osb)); 614 sp++; 615 uap->buf++; 616 count--; 617 } 618 free(buf, M_STATFS); 619 } 620 return (error); 621 } 622 623 /* 624 * Implement fstatfs() for (NFS) file handles. 625 */ 626 #ifndef _SYS_SYSPROTO_H_ 627 struct freebsd4_fhstatfs_args { 628 struct fhandle *u_fhp; 629 struct ostatfs *buf; 630 }; 631 #endif 632 int 633 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 634 { 635 struct ostatfs osb; 636 struct statfs *sfp; 637 fhandle_t fh; 638 int error; 639 640 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 641 if (error != 0) 642 return (error); 643 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 644 error = kern_fhstatfs(td, fh, sfp); 645 if (error == 0) { 646 freebsd4_cvtstatfs(sfp, &osb); 647 error = copyout(&osb, uap->buf, sizeof(osb)); 648 } 649 free(sfp, M_STATFS); 650 return (error); 651 } 652 653 /* 654 * Convert a new format statfs structure to an old format statfs structure. 655 */ 656 static void 657 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 658 { 659 660 statfs_scale_blocks(nsp, LONG_MAX); 661 bzero(osp, sizeof(*osp)); 662 osp->f_bsize = nsp->f_bsize; 663 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 664 osp->f_blocks = nsp->f_blocks; 665 osp->f_bfree = nsp->f_bfree; 666 osp->f_bavail = nsp->f_bavail; 667 osp->f_files = MIN(nsp->f_files, LONG_MAX); 668 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 669 osp->f_owner = nsp->f_owner; 670 osp->f_type = nsp->f_type; 671 osp->f_flags = nsp->f_flags; 672 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 673 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 674 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 675 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 676 strlcpy(osp->f_fstypename, nsp->f_fstypename, 677 MIN(MFSNAMELEN, OMFSNAMELEN)); 678 strlcpy(osp->f_mntonname, nsp->f_mntonname, 679 MIN(MNAMELEN, OMNAMELEN)); 680 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 681 MIN(MNAMELEN, OMNAMELEN)); 682 osp->f_fsid = nsp->f_fsid; 683 } 684 #endif /* COMPAT_FREEBSD4 */ 685 686 #if defined(COMPAT_FREEBSD11) 687 /* 688 * Get old format filesystem statistics. 689 */ 690 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 691 692 int 693 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 694 { 695 struct freebsd11_statfs osb; 696 struct statfs *sfp; 697 int error; 698 699 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 700 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 701 if (error == 0) { 702 freebsd11_cvtstatfs(sfp, &osb); 703 error = copyout(&osb, uap->buf, sizeof(osb)); 704 } 705 free(sfp, M_STATFS); 706 return (error); 707 } 708 709 /* 710 * Get filesystem statistics. 711 */ 712 int 713 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 714 { 715 struct freebsd11_statfs osb; 716 struct statfs *sfp; 717 int error; 718 719 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 720 error = kern_fstatfs(td, uap->fd, sfp); 721 if (error == 0) { 722 freebsd11_cvtstatfs(sfp, &osb); 723 error = copyout(&osb, uap->buf, sizeof(osb)); 724 } 725 free(sfp, M_STATFS); 726 return (error); 727 } 728 729 /* 730 * Get statistics on all filesystems. 731 */ 732 int 733 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 734 { 735 struct freebsd11_statfs osb; 736 struct statfs *buf, *sp; 737 size_t count, size; 738 int error; 739 740 count = uap->bufsize / sizeof(struct ostatfs); 741 size = count * sizeof(struct statfs); 742 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 743 uap->mode); 744 if (error == 0) 745 td->td_retval[0] = count; 746 if (size > 0) { 747 sp = buf; 748 while (count > 0 && error == 0) { 749 freebsd11_cvtstatfs(sp, &osb); 750 error = copyout(&osb, uap->buf, sizeof(osb)); 751 sp++; 752 uap->buf++; 753 count--; 754 } 755 free(buf, M_STATFS); 756 } 757 return (error); 758 } 759 760 /* 761 * Implement fstatfs() for (NFS) file handles. 762 */ 763 int 764 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 765 { 766 struct freebsd11_statfs osb; 767 struct statfs *sfp; 768 fhandle_t fh; 769 int error; 770 771 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 772 if (error) 773 return (error); 774 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 775 error = kern_fhstatfs(td, fh, sfp); 776 if (error == 0) { 777 freebsd11_cvtstatfs(sfp, &osb); 778 error = copyout(&osb, uap->buf, sizeof(osb)); 779 } 780 free(sfp, M_STATFS); 781 return (error); 782 } 783 784 /* 785 * Convert a new format statfs structure to an old format statfs structure. 786 */ 787 static void 788 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 789 { 790 791 bzero(osp, sizeof(*osp)); 792 osp->f_version = FREEBSD11_STATFS_VERSION; 793 osp->f_type = nsp->f_type; 794 osp->f_flags = nsp->f_flags; 795 osp->f_bsize = nsp->f_bsize; 796 osp->f_iosize = nsp->f_iosize; 797 osp->f_blocks = nsp->f_blocks; 798 osp->f_bfree = nsp->f_bfree; 799 osp->f_bavail = nsp->f_bavail; 800 osp->f_files = nsp->f_files; 801 osp->f_ffree = nsp->f_ffree; 802 osp->f_syncwrites = nsp->f_syncwrites; 803 osp->f_asyncwrites = nsp->f_asyncwrites; 804 osp->f_syncreads = nsp->f_syncreads; 805 osp->f_asyncreads = nsp->f_asyncreads; 806 osp->f_namemax = nsp->f_namemax; 807 osp->f_owner = nsp->f_owner; 808 osp->f_fsid = nsp->f_fsid; 809 strlcpy(osp->f_fstypename, nsp->f_fstypename, 810 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 811 strlcpy(osp->f_mntonname, nsp->f_mntonname, 812 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 813 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 814 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 815 } 816 #endif /* COMPAT_FREEBSD11 */ 817 818 /* 819 * Change current working directory to a given file descriptor. 820 */ 821 #ifndef _SYS_SYSPROTO_H_ 822 struct fchdir_args { 823 int fd; 824 }; 825 #endif 826 int 827 sys_fchdir(struct thread *td, struct fchdir_args *uap) 828 { 829 struct vnode *vp, *tdp; 830 struct mount *mp; 831 struct file *fp; 832 int error; 833 834 AUDIT_ARG_FD(uap->fd); 835 error = getvnode(td, uap->fd, &cap_fchdir_rights, 836 &fp); 837 if (error != 0) 838 return (error); 839 vp = fp->f_vnode; 840 vrefact(vp); 841 fdrop(fp, td); 842 vn_lock(vp, LK_SHARED | LK_RETRY); 843 AUDIT_ARG_VNODE1(vp); 844 error = change_dir(vp, td); 845 while (!error && (mp = vp->v_mountedhere) != NULL) { 846 if (vfs_busy(mp, 0)) 847 continue; 848 error = VFS_ROOT(mp, LK_SHARED, &tdp); 849 vfs_unbusy(mp); 850 if (error != 0) 851 break; 852 vput(vp); 853 vp = tdp; 854 } 855 if (error != 0) { 856 vput(vp); 857 return (error); 858 } 859 VOP_UNLOCK(vp); 860 pwd_chdir(td, vp); 861 return (0); 862 } 863 864 /* 865 * Change current working directory (``.''). 866 */ 867 #ifndef _SYS_SYSPROTO_H_ 868 struct chdir_args { 869 char *path; 870 }; 871 #endif 872 int 873 sys_chdir(struct thread *td, struct chdir_args *uap) 874 { 875 876 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 877 } 878 879 int 880 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg) 881 { 882 struct nameidata nd; 883 int error; 884 885 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 886 pathseg, path, td); 887 if ((error = namei(&nd)) != 0) 888 return (error); 889 if ((error = change_dir(nd.ni_vp, td)) != 0) { 890 vput(nd.ni_vp); 891 NDFREE(&nd, NDF_ONLY_PNBUF); 892 return (error); 893 } 894 VOP_UNLOCK(nd.ni_vp); 895 NDFREE(&nd, NDF_ONLY_PNBUF); 896 pwd_chdir(td, nd.ni_vp); 897 return (0); 898 } 899 900 /* 901 * Change notion of root (``/'') directory. 902 */ 903 #ifndef _SYS_SYSPROTO_H_ 904 struct chroot_args { 905 char *path; 906 }; 907 #endif 908 int 909 sys_chroot(struct thread *td, struct chroot_args *uap) 910 { 911 struct nameidata nd; 912 int error; 913 914 error = priv_check(td, PRIV_VFS_CHROOT); 915 if (error != 0) 916 return (error); 917 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 918 UIO_USERSPACE, uap->path, td); 919 error = namei(&nd); 920 if (error != 0) 921 goto error; 922 error = change_dir(nd.ni_vp, td); 923 if (error != 0) 924 goto e_vunlock; 925 #ifdef MAC 926 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 927 if (error != 0) 928 goto e_vunlock; 929 #endif 930 VOP_UNLOCK(nd.ni_vp); 931 error = pwd_chroot(td, nd.ni_vp); 932 vrele(nd.ni_vp); 933 NDFREE(&nd, NDF_ONLY_PNBUF); 934 return (error); 935 e_vunlock: 936 vput(nd.ni_vp); 937 error: 938 NDFREE(&nd, NDF_ONLY_PNBUF); 939 return (error); 940 } 941 942 /* 943 * Common routine for chroot and chdir. Callers must provide a locked vnode 944 * instance. 945 */ 946 int 947 change_dir(struct vnode *vp, struct thread *td) 948 { 949 #ifdef MAC 950 int error; 951 #endif 952 953 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 954 if (vp->v_type != VDIR) 955 return (ENOTDIR); 956 #ifdef MAC 957 error = mac_vnode_check_chdir(td->td_ucred, vp); 958 if (error != 0) 959 return (error); 960 #endif 961 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 962 } 963 964 static __inline void 965 flags_to_rights(int flags, cap_rights_t *rightsp) 966 { 967 968 if (flags & O_EXEC) { 969 cap_rights_set(rightsp, CAP_FEXECVE); 970 } else { 971 switch ((flags & O_ACCMODE)) { 972 case O_RDONLY: 973 cap_rights_set(rightsp, CAP_READ); 974 break; 975 case O_RDWR: 976 cap_rights_set(rightsp, CAP_READ); 977 /* FALLTHROUGH */ 978 case O_WRONLY: 979 cap_rights_set(rightsp, CAP_WRITE); 980 if (!(flags & (O_APPEND | O_TRUNC))) 981 cap_rights_set(rightsp, CAP_SEEK); 982 break; 983 } 984 } 985 986 if (flags & O_CREAT) 987 cap_rights_set(rightsp, CAP_CREATE); 988 989 if (flags & O_TRUNC) 990 cap_rights_set(rightsp, CAP_FTRUNCATE); 991 992 if (flags & (O_SYNC | O_FSYNC)) 993 cap_rights_set(rightsp, CAP_FSYNC); 994 995 if (flags & (O_EXLOCK | O_SHLOCK)) 996 cap_rights_set(rightsp, CAP_FLOCK); 997 } 998 999 /* 1000 * Check permissions, allocate an open file structure, and call the device 1001 * open routine if any. 1002 */ 1003 #ifndef _SYS_SYSPROTO_H_ 1004 struct open_args { 1005 char *path; 1006 int flags; 1007 int mode; 1008 }; 1009 #endif 1010 int 1011 sys_open(struct thread *td, struct open_args *uap) 1012 { 1013 1014 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1015 uap->flags, uap->mode)); 1016 } 1017 1018 #ifndef _SYS_SYSPROTO_H_ 1019 struct openat_args { 1020 int fd; 1021 char *path; 1022 int flag; 1023 int mode; 1024 }; 1025 #endif 1026 int 1027 sys_openat(struct thread *td, struct openat_args *uap) 1028 { 1029 1030 AUDIT_ARG_FD(uap->fd); 1031 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1032 uap->mode)); 1033 } 1034 1035 int 1036 kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1037 int flags, int mode) 1038 { 1039 struct proc *p = td->td_proc; 1040 struct filedesc *fdp = p->p_fd; 1041 struct file *fp; 1042 struct vnode *vp; 1043 struct nameidata nd; 1044 cap_rights_t rights; 1045 int cmode, error, indx; 1046 1047 indx = -1; 1048 1049 AUDIT_ARG_FFLAGS(flags); 1050 AUDIT_ARG_MODE(mode); 1051 cap_rights_init(&rights, CAP_LOOKUP); 1052 flags_to_rights(flags, &rights); 1053 /* 1054 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1055 * may be specified. 1056 */ 1057 if (flags & O_EXEC) { 1058 if (flags & O_ACCMODE) 1059 return (EINVAL); 1060 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1061 return (EINVAL); 1062 } else { 1063 flags = FFLAGS(flags); 1064 } 1065 1066 /* 1067 * Allocate a file structure. The descriptor to reference it 1068 * is allocated and set by finstall() below. 1069 */ 1070 error = falloc_noinstall(td, &fp); 1071 if (error != 0) 1072 return (error); 1073 /* 1074 * An extra reference on `fp' has been held for us by 1075 * falloc_noinstall(). 1076 */ 1077 /* Set the flags early so the finit in devfs can pick them up. */ 1078 fp->f_flag = flags & FMASK; 1079 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; 1080 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1081 &rights, td); 1082 td->td_dupfd = -1; /* XXX check for fdopen */ 1083 error = vn_open(&nd, &flags, cmode, fp); 1084 if (error != 0) { 1085 /* 1086 * If the vn_open replaced the method vector, something 1087 * wonderous happened deep below and we just pass it up 1088 * pretending we know what we do. 1089 */ 1090 if (error == ENXIO && fp->f_ops != &badfileops) 1091 goto success; 1092 1093 /* 1094 * Handle special fdopen() case. bleh. 1095 * 1096 * Don't do this for relative (capability) lookups; we don't 1097 * understand exactly what would happen, and we don't think 1098 * that it ever should. 1099 */ 1100 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 && 1101 (error == ENODEV || error == ENXIO) && 1102 td->td_dupfd >= 0) { 1103 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1104 &indx); 1105 if (error == 0) 1106 goto success; 1107 } 1108 1109 goto bad; 1110 } 1111 td->td_dupfd = 0; 1112 NDFREE(&nd, NDF_ONLY_PNBUF); 1113 vp = nd.ni_vp; 1114 1115 /* 1116 * Store the vnode, for any f_type. Typically, the vnode use 1117 * count is decremented by direct call to vn_closefile() for 1118 * files that switched type in the cdevsw fdopen() method. 1119 */ 1120 fp->f_vnode = vp; 1121 /* 1122 * If the file wasn't claimed by devfs bind it to the normal 1123 * vnode operations here. 1124 */ 1125 if (fp->f_ops == &badfileops) { 1126 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); 1127 fp->f_seqcount = 1; 1128 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK), 1129 DTYPE_VNODE, vp, &vnops); 1130 } 1131 1132 VOP_UNLOCK(vp); 1133 if (flags & O_TRUNC) { 1134 error = fo_truncate(fp, 0, td->td_ucred, td); 1135 if (error != 0) 1136 goto bad; 1137 } 1138 success: 1139 /* 1140 * If we haven't already installed the FD (for dupfdopen), do so now. 1141 */ 1142 if (indx == -1) { 1143 struct filecaps *fcaps; 1144 1145 #ifdef CAPABILITIES 1146 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0) 1147 fcaps = &nd.ni_filecaps; 1148 else 1149 #endif 1150 fcaps = NULL; 1151 error = finstall(td, fp, &indx, flags, fcaps); 1152 /* On success finstall() consumes fcaps. */ 1153 if (error != 0) { 1154 filecaps_free(&nd.ni_filecaps); 1155 goto bad; 1156 } 1157 } else { 1158 filecaps_free(&nd.ni_filecaps); 1159 } 1160 1161 /* 1162 * Release our private reference, leaving the one associated with 1163 * the descriptor table intact. 1164 */ 1165 fdrop(fp, td); 1166 td->td_retval[0] = indx; 1167 return (0); 1168 bad: 1169 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1170 fdrop(fp, td); 1171 return (error); 1172 } 1173 1174 #ifdef COMPAT_43 1175 /* 1176 * Create a file. 1177 */ 1178 #ifndef _SYS_SYSPROTO_H_ 1179 struct ocreat_args { 1180 char *path; 1181 int mode; 1182 }; 1183 #endif 1184 int 1185 ocreat(struct thread *td, struct ocreat_args *uap) 1186 { 1187 1188 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1189 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1190 } 1191 #endif /* COMPAT_43 */ 1192 1193 /* 1194 * Create a special file. 1195 */ 1196 #ifndef _SYS_SYSPROTO_H_ 1197 struct mknodat_args { 1198 int fd; 1199 char *path; 1200 mode_t mode; 1201 dev_t dev; 1202 }; 1203 #endif 1204 int 1205 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1206 { 1207 1208 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1209 uap->dev)); 1210 } 1211 1212 #if defined(COMPAT_FREEBSD11) 1213 int 1214 freebsd11_mknod(struct thread *td, 1215 struct freebsd11_mknod_args *uap) 1216 { 1217 1218 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1219 uap->mode, uap->dev)); 1220 } 1221 1222 int 1223 freebsd11_mknodat(struct thread *td, 1224 struct freebsd11_mknodat_args *uap) 1225 { 1226 1227 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1228 uap->dev)); 1229 } 1230 #endif /* COMPAT_FREEBSD11 */ 1231 1232 int 1233 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1234 int mode, dev_t dev) 1235 { 1236 struct vnode *vp; 1237 struct mount *mp; 1238 struct vattr vattr; 1239 struct nameidata nd; 1240 int error, whiteout = 0; 1241 1242 AUDIT_ARG_MODE(mode); 1243 AUDIT_ARG_DEV(dev); 1244 switch (mode & S_IFMT) { 1245 case S_IFCHR: 1246 case S_IFBLK: 1247 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1248 if (error == 0 && dev == VNOVAL) 1249 error = EINVAL; 1250 break; 1251 case S_IFWHT: 1252 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1253 break; 1254 case S_IFIFO: 1255 if (dev == 0) 1256 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1257 /* FALLTHROUGH */ 1258 default: 1259 error = EINVAL; 1260 break; 1261 } 1262 if (error != 0) 1263 return (error); 1264 restart: 1265 bwillwrite(); 1266 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1267 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1268 td); 1269 if ((error = namei(&nd)) != 0) 1270 return (error); 1271 vp = nd.ni_vp; 1272 if (vp != NULL) { 1273 NDFREE(&nd, NDF_ONLY_PNBUF); 1274 if (vp == nd.ni_dvp) 1275 vrele(nd.ni_dvp); 1276 else 1277 vput(nd.ni_dvp); 1278 vrele(vp); 1279 return (EEXIST); 1280 } else { 1281 VATTR_NULL(&vattr); 1282 vattr.va_mode = (mode & ALLPERMS) & 1283 ~td->td_proc->p_fd->fd_cmask; 1284 vattr.va_rdev = dev; 1285 whiteout = 0; 1286 1287 switch (mode & S_IFMT) { 1288 case S_IFCHR: 1289 vattr.va_type = VCHR; 1290 break; 1291 case S_IFBLK: 1292 vattr.va_type = VBLK; 1293 break; 1294 case S_IFWHT: 1295 whiteout = 1; 1296 break; 1297 default: 1298 panic("kern_mknod: invalid mode"); 1299 } 1300 } 1301 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1302 NDFREE(&nd, NDF_ONLY_PNBUF); 1303 vput(nd.ni_dvp); 1304 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1305 return (error); 1306 goto restart; 1307 } 1308 #ifdef MAC 1309 if (error == 0 && !whiteout) 1310 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1311 &nd.ni_cnd, &vattr); 1312 #endif 1313 if (error == 0) { 1314 if (whiteout) 1315 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1316 else { 1317 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1318 &nd.ni_cnd, &vattr); 1319 if (error == 0) 1320 vput(nd.ni_vp); 1321 } 1322 } 1323 NDFREE(&nd, NDF_ONLY_PNBUF); 1324 vput(nd.ni_dvp); 1325 vn_finished_write(mp); 1326 return (error); 1327 } 1328 1329 /* 1330 * Create a named pipe. 1331 */ 1332 #ifndef _SYS_SYSPROTO_H_ 1333 struct mkfifo_args { 1334 char *path; 1335 int mode; 1336 }; 1337 #endif 1338 int 1339 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1340 { 1341 1342 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1343 uap->mode)); 1344 } 1345 1346 #ifndef _SYS_SYSPROTO_H_ 1347 struct mkfifoat_args { 1348 int fd; 1349 char *path; 1350 mode_t mode; 1351 }; 1352 #endif 1353 int 1354 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1355 { 1356 1357 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1358 uap->mode)); 1359 } 1360 1361 int 1362 kern_mkfifoat(struct thread *td, int fd, const char *path, 1363 enum uio_seg pathseg, int mode) 1364 { 1365 struct mount *mp; 1366 struct vattr vattr; 1367 struct nameidata nd; 1368 int error; 1369 1370 AUDIT_ARG_MODE(mode); 1371 restart: 1372 bwillwrite(); 1373 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1374 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1375 td); 1376 if ((error = namei(&nd)) != 0) 1377 return (error); 1378 if (nd.ni_vp != NULL) { 1379 NDFREE(&nd, NDF_ONLY_PNBUF); 1380 if (nd.ni_vp == nd.ni_dvp) 1381 vrele(nd.ni_dvp); 1382 else 1383 vput(nd.ni_dvp); 1384 vrele(nd.ni_vp); 1385 return (EEXIST); 1386 } 1387 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1388 NDFREE(&nd, NDF_ONLY_PNBUF); 1389 vput(nd.ni_dvp); 1390 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1391 return (error); 1392 goto restart; 1393 } 1394 VATTR_NULL(&vattr); 1395 vattr.va_type = VFIFO; 1396 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1397 #ifdef MAC 1398 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1399 &vattr); 1400 if (error != 0) 1401 goto out; 1402 #endif 1403 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1404 if (error == 0) 1405 vput(nd.ni_vp); 1406 #ifdef MAC 1407 out: 1408 #endif 1409 vput(nd.ni_dvp); 1410 vn_finished_write(mp); 1411 NDFREE(&nd, NDF_ONLY_PNBUF); 1412 return (error); 1413 } 1414 1415 /* 1416 * Make a hard file link. 1417 */ 1418 #ifndef _SYS_SYSPROTO_H_ 1419 struct link_args { 1420 char *path; 1421 char *link; 1422 }; 1423 #endif 1424 int 1425 sys_link(struct thread *td, struct link_args *uap) 1426 { 1427 1428 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1429 UIO_USERSPACE, FOLLOW)); 1430 } 1431 1432 #ifndef _SYS_SYSPROTO_H_ 1433 struct linkat_args { 1434 int fd1; 1435 char *path1; 1436 int fd2; 1437 char *path2; 1438 int flag; 1439 }; 1440 #endif 1441 int 1442 sys_linkat(struct thread *td, struct linkat_args *uap) 1443 { 1444 int flag; 1445 1446 flag = uap->flag; 1447 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_BENEATH)) != 0) 1448 return (EINVAL); 1449 1450 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1451 UIO_USERSPACE, ((flag & AT_SYMLINK_FOLLOW) != 0 ? FOLLOW : 1452 NOFOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0))); 1453 } 1454 1455 int hardlink_check_uid = 0; 1456 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1457 &hardlink_check_uid, 0, 1458 "Unprivileged processes cannot create hard links to files owned by other " 1459 "users"); 1460 static int hardlink_check_gid = 0; 1461 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1462 &hardlink_check_gid, 0, 1463 "Unprivileged processes cannot create hard links to files owned by other " 1464 "groups"); 1465 1466 static int 1467 can_hardlink(struct vnode *vp, struct ucred *cred) 1468 { 1469 struct vattr va; 1470 int error; 1471 1472 if (!hardlink_check_uid && !hardlink_check_gid) 1473 return (0); 1474 1475 error = VOP_GETATTR(vp, &va, cred); 1476 if (error != 0) 1477 return (error); 1478 1479 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1480 error = priv_check_cred(cred, PRIV_VFS_LINK); 1481 if (error != 0) 1482 return (error); 1483 } 1484 1485 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1486 error = priv_check_cred(cred, PRIV_VFS_LINK); 1487 if (error != 0) 1488 return (error); 1489 } 1490 1491 return (0); 1492 } 1493 1494 int 1495 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1496 const char *path2, enum uio_seg segflag, int follow) 1497 { 1498 struct nameidata nd; 1499 int error; 1500 1501 do { 1502 bwillwrite(); 1503 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag, 1504 path1, fd1, &cap_linkat_source_rights, td); 1505 if ((error = namei(&nd)) != 0) 1506 return (error); 1507 NDFREE(&nd, NDF_ONLY_PNBUF); 1508 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1509 } while (error == EAGAIN); 1510 return (error); 1511 } 1512 1513 static int 1514 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1515 enum uio_seg segflag) 1516 { 1517 struct nameidata nd; 1518 struct mount *mp; 1519 int error; 1520 1521 if (vp->v_type == VDIR) { 1522 vrele(vp); 1523 return (EPERM); /* POSIX */ 1524 } 1525 NDINIT_ATRIGHTS(&nd, CREATE, 1526 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1527 &cap_linkat_target_rights, td); 1528 if ((error = namei(&nd)) == 0) { 1529 if (nd.ni_vp != NULL) { 1530 NDFREE(&nd, NDF_ONLY_PNBUF); 1531 if (nd.ni_dvp == nd.ni_vp) 1532 vrele(nd.ni_dvp); 1533 else 1534 vput(nd.ni_dvp); 1535 vrele(nd.ni_vp); 1536 vrele(vp); 1537 return (EEXIST); 1538 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1539 /* 1540 * Cross-device link. No need to recheck 1541 * vp->v_type, since it cannot change, except 1542 * to VBAD. 1543 */ 1544 NDFREE(&nd, NDF_ONLY_PNBUF); 1545 vput(nd.ni_dvp); 1546 vrele(vp); 1547 return (EXDEV); 1548 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1549 error = can_hardlink(vp, td->td_ucred); 1550 #ifdef MAC 1551 if (error == 0) 1552 error = mac_vnode_check_link(td->td_ucred, 1553 nd.ni_dvp, vp, &nd.ni_cnd); 1554 #endif 1555 if (error != 0) { 1556 vput(vp); 1557 vput(nd.ni_dvp); 1558 NDFREE(&nd, NDF_ONLY_PNBUF); 1559 return (error); 1560 } 1561 error = vn_start_write(vp, &mp, V_NOWAIT); 1562 if (error != 0) { 1563 vput(vp); 1564 vput(nd.ni_dvp); 1565 NDFREE(&nd, NDF_ONLY_PNBUF); 1566 error = vn_start_write(NULL, &mp, 1567 V_XSLEEP | PCATCH); 1568 if (error != 0) 1569 return (error); 1570 return (EAGAIN); 1571 } 1572 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1573 VOP_UNLOCK(vp); 1574 vput(nd.ni_dvp); 1575 vn_finished_write(mp); 1576 NDFREE(&nd, NDF_ONLY_PNBUF); 1577 } else { 1578 vput(nd.ni_dvp); 1579 NDFREE(&nd, NDF_ONLY_PNBUF); 1580 vrele(vp); 1581 return (EAGAIN); 1582 } 1583 } 1584 vrele(vp); 1585 return (error); 1586 } 1587 1588 /* 1589 * Make a symbolic link. 1590 */ 1591 #ifndef _SYS_SYSPROTO_H_ 1592 struct symlink_args { 1593 char *path; 1594 char *link; 1595 }; 1596 #endif 1597 int 1598 sys_symlink(struct thread *td, struct symlink_args *uap) 1599 { 1600 1601 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1602 UIO_USERSPACE)); 1603 } 1604 1605 #ifndef _SYS_SYSPROTO_H_ 1606 struct symlinkat_args { 1607 char *path; 1608 int fd; 1609 char *path2; 1610 }; 1611 #endif 1612 int 1613 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1614 { 1615 1616 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1617 UIO_USERSPACE)); 1618 } 1619 1620 int 1621 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1622 enum uio_seg segflg) 1623 { 1624 struct mount *mp; 1625 struct vattr vattr; 1626 const char *syspath; 1627 char *tmppath; 1628 struct nameidata nd; 1629 int error; 1630 1631 if (segflg == UIO_SYSSPACE) { 1632 syspath = path1; 1633 } else { 1634 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1635 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1636 goto out; 1637 syspath = tmppath; 1638 } 1639 AUDIT_ARG_TEXT(syspath); 1640 restart: 1641 bwillwrite(); 1642 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1643 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1644 td); 1645 if ((error = namei(&nd)) != 0) 1646 goto out; 1647 if (nd.ni_vp) { 1648 NDFREE(&nd, NDF_ONLY_PNBUF); 1649 if (nd.ni_vp == nd.ni_dvp) 1650 vrele(nd.ni_dvp); 1651 else 1652 vput(nd.ni_dvp); 1653 vrele(nd.ni_vp); 1654 error = EEXIST; 1655 goto out; 1656 } 1657 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1658 NDFREE(&nd, NDF_ONLY_PNBUF); 1659 vput(nd.ni_dvp); 1660 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1661 goto out; 1662 goto restart; 1663 } 1664 VATTR_NULL(&vattr); 1665 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1666 #ifdef MAC 1667 vattr.va_type = VLNK; 1668 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1669 &vattr); 1670 if (error != 0) 1671 goto out2; 1672 #endif 1673 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1674 if (error == 0) 1675 vput(nd.ni_vp); 1676 #ifdef MAC 1677 out2: 1678 #endif 1679 NDFREE(&nd, NDF_ONLY_PNBUF); 1680 vput(nd.ni_dvp); 1681 vn_finished_write(mp); 1682 out: 1683 if (segflg != UIO_SYSSPACE) 1684 uma_zfree(namei_zone, tmppath); 1685 return (error); 1686 } 1687 1688 /* 1689 * Delete a whiteout from the filesystem. 1690 */ 1691 #ifndef _SYS_SYSPROTO_H_ 1692 struct undelete_args { 1693 char *path; 1694 }; 1695 #endif 1696 int 1697 sys_undelete(struct thread *td, struct undelete_args *uap) 1698 { 1699 struct mount *mp; 1700 struct nameidata nd; 1701 int error; 1702 1703 restart: 1704 bwillwrite(); 1705 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1706 UIO_USERSPACE, uap->path, td); 1707 error = namei(&nd); 1708 if (error != 0) 1709 return (error); 1710 1711 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1712 NDFREE(&nd, NDF_ONLY_PNBUF); 1713 if (nd.ni_vp == nd.ni_dvp) 1714 vrele(nd.ni_dvp); 1715 else 1716 vput(nd.ni_dvp); 1717 if (nd.ni_vp) 1718 vrele(nd.ni_vp); 1719 return (EEXIST); 1720 } 1721 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1722 NDFREE(&nd, NDF_ONLY_PNBUF); 1723 vput(nd.ni_dvp); 1724 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1725 return (error); 1726 goto restart; 1727 } 1728 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1729 NDFREE(&nd, NDF_ONLY_PNBUF); 1730 vput(nd.ni_dvp); 1731 vn_finished_write(mp); 1732 return (error); 1733 } 1734 1735 /* 1736 * Delete a name from the filesystem. 1737 */ 1738 #ifndef _SYS_SYSPROTO_H_ 1739 struct unlink_args { 1740 char *path; 1741 }; 1742 #endif 1743 int 1744 sys_unlink(struct thread *td, struct unlink_args *uap) 1745 { 1746 1747 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1748 0, 0)); 1749 } 1750 1751 static int 1752 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1753 int flag, enum uio_seg pathseg, ino_t oldinum) 1754 { 1755 1756 if ((flag & ~AT_REMOVEDIR) != 0) 1757 return (EINVAL); 1758 1759 if ((flag & AT_REMOVEDIR) != 0) 1760 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1761 1762 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1763 } 1764 1765 #ifndef _SYS_SYSPROTO_H_ 1766 struct unlinkat_args { 1767 int fd; 1768 char *path; 1769 int flag; 1770 }; 1771 #endif 1772 int 1773 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1774 { 1775 1776 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1777 UIO_USERSPACE, 0)); 1778 } 1779 1780 #ifndef _SYS_SYSPROTO_H_ 1781 struct funlinkat_args { 1782 int dfd; 1783 const char *path; 1784 int fd; 1785 int flag; 1786 }; 1787 #endif 1788 int 1789 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 1790 { 1791 1792 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 1793 UIO_USERSPACE, 0)); 1794 } 1795 1796 int 1797 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 1798 enum uio_seg pathseg, int flag, ino_t oldinum) 1799 { 1800 struct mount *mp; 1801 struct file *fp; 1802 struct vnode *vp; 1803 struct nameidata nd; 1804 struct stat sb; 1805 int error; 1806 1807 fp = NULL; 1808 if (fd != FD_NONE) { 1809 error = getvnode(td, fd, &cap_no_rights, &fp); 1810 if (error != 0) 1811 return (error); 1812 } 1813 1814 restart: 1815 bwillwrite(); 1816 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1817 ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 1818 pathseg, path, dfd, &cap_unlinkat_rights, td); 1819 if ((error = namei(&nd)) != 0) { 1820 if (error == EINVAL) 1821 error = EPERM; 1822 goto fdout; 1823 } 1824 vp = nd.ni_vp; 1825 if (vp->v_type == VDIR && oldinum == 0) { 1826 error = EPERM; /* POSIX */ 1827 } else if (oldinum != 0 && 1828 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1829 sb.st_ino != oldinum) { 1830 error = EIDRM; /* Identifier removed */ 1831 } else if (fp != NULL && fp->f_vnode != vp) { 1832 if (VN_IS_DOOMED(fp->f_vnode)) 1833 error = EBADF; 1834 else 1835 error = EDEADLK; 1836 } else { 1837 /* 1838 * The root of a mounted filesystem cannot be deleted. 1839 * 1840 * XXX: can this only be a VDIR case? 1841 */ 1842 if (vp->v_vflag & VV_ROOT) 1843 error = EBUSY; 1844 } 1845 if (error == 0) { 1846 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1847 NDFREE(&nd, NDF_ONLY_PNBUF); 1848 vput(nd.ni_dvp); 1849 if (vp == nd.ni_dvp) 1850 vrele(vp); 1851 else 1852 vput(vp); 1853 if ((error = vn_start_write(NULL, &mp, 1854 V_XSLEEP | PCATCH)) != 0) { 1855 goto fdout; 1856 } 1857 goto restart; 1858 } 1859 #ifdef MAC 1860 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1861 &nd.ni_cnd); 1862 if (error != 0) 1863 goto out; 1864 #endif 1865 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1866 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1867 #ifdef MAC 1868 out: 1869 #endif 1870 vn_finished_write(mp); 1871 } 1872 NDFREE(&nd, NDF_ONLY_PNBUF); 1873 vput(nd.ni_dvp); 1874 if (vp == nd.ni_dvp) 1875 vrele(vp); 1876 else 1877 vput(vp); 1878 fdout: 1879 if (fp != NULL) 1880 fdrop(fp, td); 1881 return (error); 1882 } 1883 1884 /* 1885 * Reposition read/write file offset. 1886 */ 1887 #ifndef _SYS_SYSPROTO_H_ 1888 struct lseek_args { 1889 int fd; 1890 int pad; 1891 off_t offset; 1892 int whence; 1893 }; 1894 #endif 1895 int 1896 sys_lseek(struct thread *td, struct lseek_args *uap) 1897 { 1898 1899 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1900 } 1901 1902 int 1903 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1904 { 1905 struct file *fp; 1906 int error; 1907 1908 AUDIT_ARG_FD(fd); 1909 error = fget(td, fd, &cap_seek_rights, &fp); 1910 if (error != 0) 1911 return (error); 1912 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1913 fo_seek(fp, offset, whence, td) : ESPIPE; 1914 fdrop(fp, td); 1915 return (error); 1916 } 1917 1918 #if defined(COMPAT_43) 1919 /* 1920 * Reposition read/write file offset. 1921 */ 1922 #ifndef _SYS_SYSPROTO_H_ 1923 struct olseek_args { 1924 int fd; 1925 long offset; 1926 int whence; 1927 }; 1928 #endif 1929 int 1930 olseek(struct thread *td, struct olseek_args *uap) 1931 { 1932 1933 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1934 } 1935 #endif /* COMPAT_43 */ 1936 1937 #if defined(COMPAT_FREEBSD6) 1938 /* Version with the 'pad' argument */ 1939 int 1940 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 1941 { 1942 1943 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1944 } 1945 #endif 1946 1947 /* 1948 * Check access permissions using passed credentials. 1949 */ 1950 static int 1951 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 1952 struct thread *td) 1953 { 1954 accmode_t accmode; 1955 int error; 1956 1957 /* Flags == 0 means only check for existence. */ 1958 if (user_flags == 0) 1959 return (0); 1960 1961 accmode = 0; 1962 if (user_flags & R_OK) 1963 accmode |= VREAD; 1964 if (user_flags & W_OK) 1965 accmode |= VWRITE; 1966 if (user_flags & X_OK) 1967 accmode |= VEXEC; 1968 #ifdef MAC 1969 error = mac_vnode_check_access(cred, vp, accmode); 1970 if (error != 0) 1971 return (error); 1972 #endif 1973 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1974 error = VOP_ACCESS(vp, accmode, cred, td); 1975 return (error); 1976 } 1977 1978 /* 1979 * Check access permissions using "real" credentials. 1980 */ 1981 #ifndef _SYS_SYSPROTO_H_ 1982 struct access_args { 1983 char *path; 1984 int amode; 1985 }; 1986 #endif 1987 int 1988 sys_access(struct thread *td, struct access_args *uap) 1989 { 1990 1991 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1992 0, uap->amode)); 1993 } 1994 1995 #ifndef _SYS_SYSPROTO_H_ 1996 struct faccessat_args { 1997 int dirfd; 1998 char *path; 1999 int amode; 2000 int flag; 2001 } 2002 #endif 2003 int 2004 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2005 { 2006 2007 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2008 uap->amode)); 2009 } 2010 2011 int 2012 kern_accessat(struct thread *td, int fd, const char *path, 2013 enum uio_seg pathseg, int flag, int amode) 2014 { 2015 struct ucred *cred, *usecred; 2016 struct vnode *vp; 2017 struct nameidata nd; 2018 int error; 2019 2020 if ((flag & ~(AT_EACCESS | AT_BENEATH)) != 0) 2021 return (EINVAL); 2022 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2023 return (EINVAL); 2024 2025 /* 2026 * Create and modify a temporary credential instead of one that 2027 * is potentially shared (if we need one). 2028 */ 2029 cred = td->td_ucred; 2030 if ((flag & AT_EACCESS) == 0 && 2031 ((cred->cr_uid != cred->cr_ruid || 2032 cred->cr_rgid != cred->cr_groups[0]))) { 2033 usecred = crdup(cred); 2034 usecred->cr_uid = cred->cr_ruid; 2035 usecred->cr_groups[0] = cred->cr_rgid; 2036 td->td_ucred = usecred; 2037 } else 2038 usecred = cred; 2039 AUDIT_ARG_VALUE(amode); 2040 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2041 AUDITVNODE1 | ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 2042 pathseg, path, fd, &cap_fstat_rights, td); 2043 if ((error = namei(&nd)) != 0) 2044 goto out; 2045 vp = nd.ni_vp; 2046 2047 error = vn_access(vp, amode, usecred, td); 2048 NDFREE(&nd, NDF_ONLY_PNBUF); 2049 vput(vp); 2050 out: 2051 if (usecred != cred) { 2052 td->td_ucred = cred; 2053 crfree(usecred); 2054 } 2055 return (error); 2056 } 2057 2058 /* 2059 * Check access permissions using "effective" credentials. 2060 */ 2061 #ifndef _SYS_SYSPROTO_H_ 2062 struct eaccess_args { 2063 char *path; 2064 int amode; 2065 }; 2066 #endif 2067 int 2068 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2069 { 2070 2071 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2072 AT_EACCESS, uap->amode)); 2073 } 2074 2075 #if defined(COMPAT_43) 2076 /* 2077 * Get file status; this version follows links. 2078 */ 2079 #ifndef _SYS_SYSPROTO_H_ 2080 struct ostat_args { 2081 char *path; 2082 struct ostat *ub; 2083 }; 2084 #endif 2085 int 2086 ostat(struct thread *td, struct ostat_args *uap) 2087 { 2088 struct stat sb; 2089 struct ostat osb; 2090 int error; 2091 2092 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2093 &sb, NULL); 2094 if (error != 0) 2095 return (error); 2096 cvtstat(&sb, &osb); 2097 return (copyout(&osb, uap->ub, sizeof (osb))); 2098 } 2099 2100 /* 2101 * Get file status; this version does not follow links. 2102 */ 2103 #ifndef _SYS_SYSPROTO_H_ 2104 struct olstat_args { 2105 char *path; 2106 struct ostat *ub; 2107 }; 2108 #endif 2109 int 2110 olstat(struct thread *td, struct olstat_args *uap) 2111 { 2112 struct stat sb; 2113 struct ostat osb; 2114 int error; 2115 2116 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2117 UIO_USERSPACE, &sb, NULL); 2118 if (error != 0) 2119 return (error); 2120 cvtstat(&sb, &osb); 2121 return (copyout(&osb, uap->ub, sizeof (osb))); 2122 } 2123 2124 /* 2125 * Convert from an old to a new stat structure. 2126 * XXX: many values are blindly truncated. 2127 */ 2128 void 2129 cvtstat(struct stat *st, struct ostat *ost) 2130 { 2131 2132 bzero(ost, sizeof(*ost)); 2133 ost->st_dev = st->st_dev; 2134 ost->st_ino = st->st_ino; 2135 ost->st_mode = st->st_mode; 2136 ost->st_nlink = st->st_nlink; 2137 ost->st_uid = st->st_uid; 2138 ost->st_gid = st->st_gid; 2139 ost->st_rdev = st->st_rdev; 2140 ost->st_size = MIN(st->st_size, INT32_MAX); 2141 ost->st_atim = st->st_atim; 2142 ost->st_mtim = st->st_mtim; 2143 ost->st_ctim = st->st_ctim; 2144 ost->st_blksize = st->st_blksize; 2145 ost->st_blocks = st->st_blocks; 2146 ost->st_flags = st->st_flags; 2147 ost->st_gen = st->st_gen; 2148 } 2149 #endif /* COMPAT_43 */ 2150 2151 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2152 int ino64_trunc_error; 2153 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2154 &ino64_trunc_error, 0, 2155 "Error on truncation of device, file or inode number, or link count"); 2156 2157 int 2158 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2159 { 2160 2161 ost->st_dev = st->st_dev; 2162 if (ost->st_dev != st->st_dev) { 2163 switch (ino64_trunc_error) { 2164 default: 2165 /* 2166 * Since dev_t is almost raw, don't clamp to the 2167 * maximum for case 2, but ignore the error. 2168 */ 2169 break; 2170 case 1: 2171 return (EOVERFLOW); 2172 } 2173 } 2174 ost->st_ino = st->st_ino; 2175 if (ost->st_ino != st->st_ino) { 2176 switch (ino64_trunc_error) { 2177 default: 2178 case 0: 2179 break; 2180 case 1: 2181 return (EOVERFLOW); 2182 case 2: 2183 ost->st_ino = UINT32_MAX; 2184 break; 2185 } 2186 } 2187 ost->st_mode = st->st_mode; 2188 ost->st_nlink = st->st_nlink; 2189 if (ost->st_nlink != st->st_nlink) { 2190 switch (ino64_trunc_error) { 2191 default: 2192 case 0: 2193 break; 2194 case 1: 2195 return (EOVERFLOW); 2196 case 2: 2197 ost->st_nlink = UINT16_MAX; 2198 break; 2199 } 2200 } 2201 ost->st_uid = st->st_uid; 2202 ost->st_gid = st->st_gid; 2203 ost->st_rdev = st->st_rdev; 2204 if (ost->st_rdev != st->st_rdev) { 2205 switch (ino64_trunc_error) { 2206 default: 2207 break; 2208 case 1: 2209 return (EOVERFLOW); 2210 } 2211 } 2212 ost->st_atim = st->st_atim; 2213 ost->st_mtim = st->st_mtim; 2214 ost->st_ctim = st->st_ctim; 2215 ost->st_size = st->st_size; 2216 ost->st_blocks = st->st_blocks; 2217 ost->st_blksize = st->st_blksize; 2218 ost->st_flags = st->st_flags; 2219 ost->st_gen = st->st_gen; 2220 ost->st_lspare = 0; 2221 ost->st_birthtim = st->st_birthtim; 2222 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2223 sizeof(*ost) - offsetof(struct freebsd11_stat, 2224 st_birthtim) - sizeof(ost->st_birthtim)); 2225 return (0); 2226 } 2227 2228 int 2229 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2230 { 2231 struct stat sb; 2232 struct freebsd11_stat osb; 2233 int error; 2234 2235 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2236 &sb, NULL); 2237 if (error != 0) 2238 return (error); 2239 error = freebsd11_cvtstat(&sb, &osb); 2240 if (error == 0) 2241 error = copyout(&osb, uap->ub, sizeof(osb)); 2242 return (error); 2243 } 2244 2245 int 2246 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2247 { 2248 struct stat sb; 2249 struct freebsd11_stat osb; 2250 int error; 2251 2252 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2253 UIO_USERSPACE, &sb, NULL); 2254 if (error != 0) 2255 return (error); 2256 error = freebsd11_cvtstat(&sb, &osb); 2257 if (error == 0) 2258 error = copyout(&osb, uap->ub, sizeof(osb)); 2259 return (error); 2260 } 2261 2262 int 2263 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2264 { 2265 struct fhandle fh; 2266 struct stat sb; 2267 struct freebsd11_stat osb; 2268 int error; 2269 2270 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2271 if (error != 0) 2272 return (error); 2273 error = kern_fhstat(td, fh, &sb); 2274 if (error != 0) 2275 return (error); 2276 error = freebsd11_cvtstat(&sb, &osb); 2277 if (error == 0) 2278 error = copyout(&osb, uap->sb, sizeof(osb)); 2279 return (error); 2280 } 2281 2282 int 2283 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2284 { 2285 struct stat sb; 2286 struct freebsd11_stat osb; 2287 int error; 2288 2289 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2290 UIO_USERSPACE, &sb, NULL); 2291 if (error != 0) 2292 return (error); 2293 error = freebsd11_cvtstat(&sb, &osb); 2294 if (error == 0) 2295 error = copyout(&osb, uap->buf, sizeof(osb)); 2296 return (error); 2297 } 2298 #endif /* COMPAT_FREEBSD11 */ 2299 2300 /* 2301 * Get file status 2302 */ 2303 #ifndef _SYS_SYSPROTO_H_ 2304 struct fstatat_args { 2305 int fd; 2306 char *path; 2307 struct stat *buf; 2308 int flag; 2309 } 2310 #endif 2311 int 2312 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2313 { 2314 struct stat sb; 2315 int error; 2316 2317 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2318 UIO_USERSPACE, &sb, NULL); 2319 if (error == 0) 2320 error = copyout(&sb, uap->buf, sizeof (sb)); 2321 return (error); 2322 } 2323 2324 int 2325 kern_statat(struct thread *td, int flag, int fd, const char *path, 2326 enum uio_seg pathseg, struct stat *sbp, 2327 void (*hook)(struct vnode *vp, struct stat *sbp)) 2328 { 2329 struct nameidata nd; 2330 int error; 2331 2332 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2333 return (EINVAL); 2334 2335 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) != 0 ? 2336 NOFOLLOW : FOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0) | 2337 LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd, 2338 &cap_fstat_rights, td); 2339 2340 if ((error = namei(&nd)) != 0) 2341 return (error); 2342 error = vn_stat(nd.ni_vp, sbp, td->td_ucred, NOCRED, td); 2343 if (error == 0) { 2344 SDT_PROBE2(vfs, , stat, mode, path, sbp->st_mode); 2345 if (S_ISREG(sbp->st_mode)) 2346 SDT_PROBE2(vfs, , stat, reg, path, pathseg); 2347 if (__predict_false(hook != NULL)) 2348 hook(nd.ni_vp, sbp); 2349 } 2350 NDFREE(&nd, NDF_ONLY_PNBUF); 2351 vput(nd.ni_vp); 2352 if (error != 0) 2353 return (error); 2354 #ifdef __STAT_TIME_T_EXT 2355 sbp->st_atim_ext = 0; 2356 sbp->st_mtim_ext = 0; 2357 sbp->st_ctim_ext = 0; 2358 sbp->st_btim_ext = 0; 2359 #endif 2360 #ifdef KTRACE 2361 if (KTRPOINT(td, KTR_STRUCT)) 2362 ktrstat(sbp); 2363 #endif 2364 return (0); 2365 } 2366 2367 #if defined(COMPAT_FREEBSD11) 2368 /* 2369 * Implementation of the NetBSD [l]stat() functions. 2370 */ 2371 void 2372 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2373 { 2374 2375 bzero(nsb, sizeof(*nsb)); 2376 nsb->st_dev = sb->st_dev; 2377 nsb->st_ino = sb->st_ino; 2378 nsb->st_mode = sb->st_mode; 2379 nsb->st_nlink = sb->st_nlink; 2380 nsb->st_uid = sb->st_uid; 2381 nsb->st_gid = sb->st_gid; 2382 nsb->st_rdev = sb->st_rdev; 2383 nsb->st_atim = sb->st_atim; 2384 nsb->st_mtim = sb->st_mtim; 2385 nsb->st_ctim = sb->st_ctim; 2386 nsb->st_size = sb->st_size; 2387 nsb->st_blocks = sb->st_blocks; 2388 nsb->st_blksize = sb->st_blksize; 2389 nsb->st_flags = sb->st_flags; 2390 nsb->st_gen = sb->st_gen; 2391 nsb->st_birthtim = sb->st_birthtim; 2392 } 2393 2394 #ifndef _SYS_SYSPROTO_H_ 2395 struct freebsd11_nstat_args { 2396 char *path; 2397 struct nstat *ub; 2398 }; 2399 #endif 2400 int 2401 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2402 { 2403 struct stat sb; 2404 struct nstat nsb; 2405 int error; 2406 2407 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2408 &sb, NULL); 2409 if (error != 0) 2410 return (error); 2411 freebsd11_cvtnstat(&sb, &nsb); 2412 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2413 } 2414 2415 /* 2416 * NetBSD lstat. Get file status; this version does not follow links. 2417 */ 2418 #ifndef _SYS_SYSPROTO_H_ 2419 struct freebsd11_nlstat_args { 2420 char *path; 2421 struct nstat *ub; 2422 }; 2423 #endif 2424 int 2425 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2426 { 2427 struct stat sb; 2428 struct nstat nsb; 2429 int error; 2430 2431 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2432 UIO_USERSPACE, &sb, NULL); 2433 if (error != 0) 2434 return (error); 2435 freebsd11_cvtnstat(&sb, &nsb); 2436 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2437 } 2438 #endif /* COMPAT_FREEBSD11 */ 2439 2440 /* 2441 * Get configurable pathname variables. 2442 */ 2443 #ifndef _SYS_SYSPROTO_H_ 2444 struct pathconf_args { 2445 char *path; 2446 int name; 2447 }; 2448 #endif 2449 int 2450 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2451 { 2452 long value; 2453 int error; 2454 2455 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2456 &value); 2457 if (error == 0) 2458 td->td_retval[0] = value; 2459 return (error); 2460 } 2461 2462 #ifndef _SYS_SYSPROTO_H_ 2463 struct lpathconf_args { 2464 char *path; 2465 int name; 2466 }; 2467 #endif 2468 int 2469 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2470 { 2471 long value; 2472 int error; 2473 2474 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2475 NOFOLLOW, &value); 2476 if (error == 0) 2477 td->td_retval[0] = value; 2478 return (error); 2479 } 2480 2481 int 2482 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2483 int name, u_long flags, long *valuep) 2484 { 2485 struct nameidata nd; 2486 int error; 2487 2488 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2489 pathseg, path, td); 2490 if ((error = namei(&nd)) != 0) 2491 return (error); 2492 NDFREE(&nd, NDF_ONLY_PNBUF); 2493 2494 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2495 vput(nd.ni_vp); 2496 return (error); 2497 } 2498 2499 /* 2500 * Return target name of a symbolic link. 2501 */ 2502 #ifndef _SYS_SYSPROTO_H_ 2503 struct readlink_args { 2504 char *path; 2505 char *buf; 2506 size_t count; 2507 }; 2508 #endif 2509 int 2510 sys_readlink(struct thread *td, struct readlink_args *uap) 2511 { 2512 2513 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2514 uap->buf, UIO_USERSPACE, uap->count)); 2515 } 2516 #ifndef _SYS_SYSPROTO_H_ 2517 struct readlinkat_args { 2518 int fd; 2519 char *path; 2520 char *buf; 2521 size_t bufsize; 2522 }; 2523 #endif 2524 int 2525 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2526 { 2527 2528 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2529 uap->buf, UIO_USERSPACE, uap->bufsize)); 2530 } 2531 2532 int 2533 kern_readlinkat(struct thread *td, int fd, const char *path, 2534 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2535 { 2536 struct vnode *vp; 2537 struct nameidata nd; 2538 int error; 2539 2540 if (count > IOSIZE_MAX) 2541 return (EINVAL); 2542 2543 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2544 pathseg, path, fd, td); 2545 2546 if ((error = namei(&nd)) != 0) 2547 return (error); 2548 NDFREE(&nd, NDF_ONLY_PNBUF); 2549 vp = nd.ni_vp; 2550 2551 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2552 vput(vp); 2553 2554 return (error); 2555 } 2556 2557 /* 2558 * Helper function to readlink from a vnode 2559 */ 2560 static int 2561 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2562 struct thread *td) 2563 { 2564 struct iovec aiov; 2565 struct uio auio; 2566 int error; 2567 2568 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2569 #ifdef MAC 2570 error = mac_vnode_check_readlink(td->td_ucred, vp); 2571 if (error != 0) 2572 return (error); 2573 #endif 2574 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2575 return (EINVAL); 2576 2577 aiov.iov_base = buf; 2578 aiov.iov_len = count; 2579 auio.uio_iov = &aiov; 2580 auio.uio_iovcnt = 1; 2581 auio.uio_offset = 0; 2582 auio.uio_rw = UIO_READ; 2583 auio.uio_segflg = bufseg; 2584 auio.uio_td = td; 2585 auio.uio_resid = count; 2586 error = VOP_READLINK(vp, &auio, td->td_ucred); 2587 td->td_retval[0] = count - auio.uio_resid; 2588 return (error); 2589 } 2590 2591 /* 2592 * Common implementation code for chflags() and fchflags(). 2593 */ 2594 static int 2595 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2596 { 2597 struct mount *mp; 2598 struct vattr vattr; 2599 int error; 2600 2601 /* We can't support the value matching VNOVAL. */ 2602 if (flags == VNOVAL) 2603 return (EOPNOTSUPP); 2604 2605 /* 2606 * Prevent non-root users from setting flags on devices. When 2607 * a device is reused, users can retain ownership of the device 2608 * if they are allowed to set flags and programs assume that 2609 * chown can't fail when done as root. 2610 */ 2611 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2612 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2613 if (error != 0) 2614 return (error); 2615 } 2616 2617 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2618 return (error); 2619 VATTR_NULL(&vattr); 2620 vattr.va_flags = flags; 2621 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2622 #ifdef MAC 2623 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2624 if (error == 0) 2625 #endif 2626 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2627 VOP_UNLOCK(vp); 2628 vn_finished_write(mp); 2629 return (error); 2630 } 2631 2632 /* 2633 * Change flags of a file given a path name. 2634 */ 2635 #ifndef _SYS_SYSPROTO_H_ 2636 struct chflags_args { 2637 const char *path; 2638 u_long flags; 2639 }; 2640 #endif 2641 int 2642 sys_chflags(struct thread *td, struct chflags_args *uap) 2643 { 2644 2645 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2646 uap->flags, 0)); 2647 } 2648 2649 #ifndef _SYS_SYSPROTO_H_ 2650 struct chflagsat_args { 2651 int fd; 2652 const char *path; 2653 u_long flags; 2654 int atflag; 2655 } 2656 #endif 2657 int 2658 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2659 { 2660 2661 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2662 return (EINVAL); 2663 2664 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2665 uap->flags, uap->atflag)); 2666 } 2667 2668 /* 2669 * Same as chflags() but doesn't follow symlinks. 2670 */ 2671 #ifndef _SYS_SYSPROTO_H_ 2672 struct lchflags_args { 2673 const char *path; 2674 u_long flags; 2675 }; 2676 #endif 2677 int 2678 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2679 { 2680 2681 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2682 uap->flags, AT_SYMLINK_NOFOLLOW)); 2683 } 2684 2685 static int 2686 kern_chflagsat(struct thread *td, int fd, const char *path, 2687 enum uio_seg pathseg, u_long flags, int atflag) 2688 { 2689 struct nameidata nd; 2690 int error, follow; 2691 2692 AUDIT_ARG_FFLAGS(flags); 2693 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2694 follow |= (atflag & AT_BENEATH) != 0 ? BENEATH : 0; 2695 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2696 &cap_fchflags_rights, td); 2697 if ((error = namei(&nd)) != 0) 2698 return (error); 2699 NDFREE(&nd, NDF_ONLY_PNBUF); 2700 error = setfflags(td, nd.ni_vp, flags); 2701 vrele(nd.ni_vp); 2702 return (error); 2703 } 2704 2705 /* 2706 * Change flags of a file given a file descriptor. 2707 */ 2708 #ifndef _SYS_SYSPROTO_H_ 2709 struct fchflags_args { 2710 int fd; 2711 u_long flags; 2712 }; 2713 #endif 2714 int 2715 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2716 { 2717 struct file *fp; 2718 int error; 2719 2720 AUDIT_ARG_FD(uap->fd); 2721 AUDIT_ARG_FFLAGS(uap->flags); 2722 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2723 &fp); 2724 if (error != 0) 2725 return (error); 2726 #ifdef AUDIT 2727 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2728 AUDIT_ARG_VNODE1(fp->f_vnode); 2729 VOP_UNLOCK(fp->f_vnode); 2730 #endif 2731 error = setfflags(td, fp->f_vnode, uap->flags); 2732 fdrop(fp, td); 2733 return (error); 2734 } 2735 2736 /* 2737 * Common implementation code for chmod(), lchmod() and fchmod(). 2738 */ 2739 int 2740 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2741 { 2742 struct mount *mp; 2743 struct vattr vattr; 2744 int error; 2745 2746 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2747 return (error); 2748 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2749 VATTR_NULL(&vattr); 2750 vattr.va_mode = mode & ALLPERMS; 2751 #ifdef MAC 2752 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2753 if (error == 0) 2754 #endif 2755 error = VOP_SETATTR(vp, &vattr, cred); 2756 VOP_UNLOCK(vp); 2757 vn_finished_write(mp); 2758 return (error); 2759 } 2760 2761 /* 2762 * Change mode of a file given path name. 2763 */ 2764 #ifndef _SYS_SYSPROTO_H_ 2765 struct chmod_args { 2766 char *path; 2767 int mode; 2768 }; 2769 #endif 2770 int 2771 sys_chmod(struct thread *td, struct chmod_args *uap) 2772 { 2773 2774 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2775 uap->mode, 0)); 2776 } 2777 2778 #ifndef _SYS_SYSPROTO_H_ 2779 struct fchmodat_args { 2780 int dirfd; 2781 char *path; 2782 mode_t mode; 2783 int flag; 2784 } 2785 #endif 2786 int 2787 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2788 { 2789 2790 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2791 return (EINVAL); 2792 2793 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2794 uap->mode, uap->flag)); 2795 } 2796 2797 /* 2798 * Change mode of a file given path name (don't follow links.) 2799 */ 2800 #ifndef _SYS_SYSPROTO_H_ 2801 struct lchmod_args { 2802 char *path; 2803 int mode; 2804 }; 2805 #endif 2806 int 2807 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2808 { 2809 2810 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2811 uap->mode, AT_SYMLINK_NOFOLLOW)); 2812 } 2813 2814 int 2815 kern_fchmodat(struct thread *td, int fd, const char *path, 2816 enum uio_seg pathseg, mode_t mode, int flag) 2817 { 2818 struct nameidata nd; 2819 int error, follow; 2820 2821 AUDIT_ARG_MODE(mode); 2822 follow = (flag & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : FOLLOW; 2823 follow |= (flag & AT_BENEATH) != 0 ? BENEATH : 0; 2824 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2825 &cap_fchmod_rights, td); 2826 if ((error = namei(&nd)) != 0) 2827 return (error); 2828 NDFREE(&nd, NDF_ONLY_PNBUF); 2829 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2830 vrele(nd.ni_vp); 2831 return (error); 2832 } 2833 2834 /* 2835 * Change mode of a file given a file descriptor. 2836 */ 2837 #ifndef _SYS_SYSPROTO_H_ 2838 struct fchmod_args { 2839 int fd; 2840 int mode; 2841 }; 2842 #endif 2843 int 2844 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2845 { 2846 struct file *fp; 2847 int error; 2848 2849 AUDIT_ARG_FD(uap->fd); 2850 AUDIT_ARG_MODE(uap->mode); 2851 2852 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2853 if (error != 0) 2854 return (error); 2855 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2856 fdrop(fp, td); 2857 return (error); 2858 } 2859 2860 /* 2861 * Common implementation for chown(), lchown(), and fchown() 2862 */ 2863 int 2864 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2865 gid_t gid) 2866 { 2867 struct mount *mp; 2868 struct vattr vattr; 2869 int error; 2870 2871 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2872 return (error); 2873 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2874 VATTR_NULL(&vattr); 2875 vattr.va_uid = uid; 2876 vattr.va_gid = gid; 2877 #ifdef MAC 2878 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2879 vattr.va_gid); 2880 if (error == 0) 2881 #endif 2882 error = VOP_SETATTR(vp, &vattr, cred); 2883 VOP_UNLOCK(vp); 2884 vn_finished_write(mp); 2885 return (error); 2886 } 2887 2888 /* 2889 * Set ownership given a path name. 2890 */ 2891 #ifndef _SYS_SYSPROTO_H_ 2892 struct chown_args { 2893 char *path; 2894 int uid; 2895 int gid; 2896 }; 2897 #endif 2898 int 2899 sys_chown(struct thread *td, struct chown_args *uap) 2900 { 2901 2902 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2903 uap->gid, 0)); 2904 } 2905 2906 #ifndef _SYS_SYSPROTO_H_ 2907 struct fchownat_args { 2908 int fd; 2909 const char * path; 2910 uid_t uid; 2911 gid_t gid; 2912 int flag; 2913 }; 2914 #endif 2915 int 2916 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2917 { 2918 2919 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2920 return (EINVAL); 2921 2922 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 2923 uap->gid, uap->flag)); 2924 } 2925 2926 int 2927 kern_fchownat(struct thread *td, int fd, const char *path, 2928 enum uio_seg pathseg, int uid, int gid, int flag) 2929 { 2930 struct nameidata nd; 2931 int error, follow; 2932 2933 AUDIT_ARG_OWNER(uid, gid); 2934 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2935 follow |= (flag & AT_BENEATH) != 0 ? BENEATH : 0; 2936 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2937 &cap_fchown_rights, td); 2938 2939 if ((error = namei(&nd)) != 0) 2940 return (error); 2941 NDFREE(&nd, NDF_ONLY_PNBUF); 2942 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 2943 vrele(nd.ni_vp); 2944 return (error); 2945 } 2946 2947 /* 2948 * Set ownership given a path name, do not cross symlinks. 2949 */ 2950 #ifndef _SYS_SYSPROTO_H_ 2951 struct lchown_args { 2952 char *path; 2953 int uid; 2954 int gid; 2955 }; 2956 #endif 2957 int 2958 sys_lchown(struct thread *td, struct lchown_args *uap) 2959 { 2960 2961 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2962 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 2963 } 2964 2965 /* 2966 * Set ownership given a file descriptor. 2967 */ 2968 #ifndef _SYS_SYSPROTO_H_ 2969 struct fchown_args { 2970 int fd; 2971 int uid; 2972 int gid; 2973 }; 2974 #endif 2975 int 2976 sys_fchown(struct thread *td, struct fchown_args *uap) 2977 { 2978 struct file *fp; 2979 int error; 2980 2981 AUDIT_ARG_FD(uap->fd); 2982 AUDIT_ARG_OWNER(uap->uid, uap->gid); 2983 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 2984 if (error != 0) 2985 return (error); 2986 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 2987 fdrop(fp, td); 2988 return (error); 2989 } 2990 2991 /* 2992 * Common implementation code for utimes(), lutimes(), and futimes(). 2993 */ 2994 static int 2995 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 2996 struct timespec *tsp) 2997 { 2998 struct timeval tv[2]; 2999 const struct timeval *tvp; 3000 int error; 3001 3002 if (usrtvp == NULL) { 3003 vfs_timestamp(&tsp[0]); 3004 tsp[1] = tsp[0]; 3005 } else { 3006 if (tvpseg == UIO_SYSSPACE) { 3007 tvp = usrtvp; 3008 } else { 3009 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3010 return (error); 3011 tvp = tv; 3012 } 3013 3014 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3015 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3016 return (EINVAL); 3017 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3018 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3019 } 3020 return (0); 3021 } 3022 3023 /* 3024 * Common implementation code for futimens(), utimensat(). 3025 */ 3026 #define UTIMENS_NULL 0x1 3027 #define UTIMENS_EXIT 0x2 3028 static int 3029 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3030 struct timespec *tsp, int *retflags) 3031 { 3032 struct timespec tsnow; 3033 int error; 3034 3035 vfs_timestamp(&tsnow); 3036 *retflags = 0; 3037 if (usrtsp == NULL) { 3038 tsp[0] = tsnow; 3039 tsp[1] = tsnow; 3040 *retflags |= UTIMENS_NULL; 3041 return (0); 3042 } 3043 if (tspseg == UIO_SYSSPACE) { 3044 tsp[0] = usrtsp[0]; 3045 tsp[1] = usrtsp[1]; 3046 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3047 return (error); 3048 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3049 *retflags |= UTIMENS_EXIT; 3050 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3051 *retflags |= UTIMENS_NULL; 3052 if (tsp[0].tv_nsec == UTIME_OMIT) 3053 tsp[0].tv_sec = VNOVAL; 3054 else if (tsp[0].tv_nsec == UTIME_NOW) 3055 tsp[0] = tsnow; 3056 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3057 return (EINVAL); 3058 if (tsp[1].tv_nsec == UTIME_OMIT) 3059 tsp[1].tv_sec = VNOVAL; 3060 else if (tsp[1].tv_nsec == UTIME_NOW) 3061 tsp[1] = tsnow; 3062 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3063 return (EINVAL); 3064 3065 return (0); 3066 } 3067 3068 /* 3069 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3070 * and utimensat(). 3071 */ 3072 static int 3073 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3074 int numtimes, int nullflag) 3075 { 3076 struct mount *mp; 3077 struct vattr vattr; 3078 int error, setbirthtime; 3079 3080 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3081 return (error); 3082 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3083 setbirthtime = 0; 3084 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3085 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3086 setbirthtime = 1; 3087 VATTR_NULL(&vattr); 3088 vattr.va_atime = ts[0]; 3089 vattr.va_mtime = ts[1]; 3090 if (setbirthtime) 3091 vattr.va_birthtime = ts[1]; 3092 if (numtimes > 2) 3093 vattr.va_birthtime = ts[2]; 3094 if (nullflag) 3095 vattr.va_vaflags |= VA_UTIMES_NULL; 3096 #ifdef MAC 3097 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3098 vattr.va_mtime); 3099 #endif 3100 if (error == 0) 3101 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3102 VOP_UNLOCK(vp); 3103 vn_finished_write(mp); 3104 return (error); 3105 } 3106 3107 /* 3108 * Set the access and modification times of a file. 3109 */ 3110 #ifndef _SYS_SYSPROTO_H_ 3111 struct utimes_args { 3112 char *path; 3113 struct timeval *tptr; 3114 }; 3115 #endif 3116 int 3117 sys_utimes(struct thread *td, struct utimes_args *uap) 3118 { 3119 3120 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3121 uap->tptr, UIO_USERSPACE)); 3122 } 3123 3124 #ifndef _SYS_SYSPROTO_H_ 3125 struct futimesat_args { 3126 int fd; 3127 const char * path; 3128 const struct timeval * times; 3129 }; 3130 #endif 3131 int 3132 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3133 { 3134 3135 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3136 uap->times, UIO_USERSPACE)); 3137 } 3138 3139 int 3140 kern_utimesat(struct thread *td, int fd, const char *path, 3141 enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) 3142 { 3143 struct nameidata nd; 3144 struct timespec ts[2]; 3145 int error; 3146 3147 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3148 return (error); 3149 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3150 &cap_futimes_rights, td); 3151 3152 if ((error = namei(&nd)) != 0) 3153 return (error); 3154 NDFREE(&nd, NDF_ONLY_PNBUF); 3155 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3156 vrele(nd.ni_vp); 3157 return (error); 3158 } 3159 3160 /* 3161 * Set the access and modification times of a file. 3162 */ 3163 #ifndef _SYS_SYSPROTO_H_ 3164 struct lutimes_args { 3165 char *path; 3166 struct timeval *tptr; 3167 }; 3168 #endif 3169 int 3170 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3171 { 3172 3173 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3174 UIO_USERSPACE)); 3175 } 3176 3177 int 3178 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3179 struct timeval *tptr, enum uio_seg tptrseg) 3180 { 3181 struct timespec ts[2]; 3182 struct nameidata nd; 3183 int error; 3184 3185 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3186 return (error); 3187 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3188 if ((error = namei(&nd)) != 0) 3189 return (error); 3190 NDFREE(&nd, NDF_ONLY_PNBUF); 3191 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3192 vrele(nd.ni_vp); 3193 return (error); 3194 } 3195 3196 /* 3197 * Set the access and modification times of a file. 3198 */ 3199 #ifndef _SYS_SYSPROTO_H_ 3200 struct futimes_args { 3201 int fd; 3202 struct timeval *tptr; 3203 }; 3204 #endif 3205 int 3206 sys_futimes(struct thread *td, struct futimes_args *uap) 3207 { 3208 3209 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3210 } 3211 3212 int 3213 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3214 enum uio_seg tptrseg) 3215 { 3216 struct timespec ts[2]; 3217 struct file *fp; 3218 int error; 3219 3220 AUDIT_ARG_FD(fd); 3221 error = getutimes(tptr, tptrseg, ts); 3222 if (error != 0) 3223 return (error); 3224 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3225 if (error != 0) 3226 return (error); 3227 #ifdef AUDIT 3228 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3229 AUDIT_ARG_VNODE1(fp->f_vnode); 3230 VOP_UNLOCK(fp->f_vnode); 3231 #endif 3232 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3233 fdrop(fp, td); 3234 return (error); 3235 } 3236 3237 int 3238 sys_futimens(struct thread *td, struct futimens_args *uap) 3239 { 3240 3241 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3242 } 3243 3244 int 3245 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3246 enum uio_seg tptrseg) 3247 { 3248 struct timespec ts[2]; 3249 struct file *fp; 3250 int error, flags; 3251 3252 AUDIT_ARG_FD(fd); 3253 error = getutimens(tptr, tptrseg, ts, &flags); 3254 if (error != 0) 3255 return (error); 3256 if (flags & UTIMENS_EXIT) 3257 return (0); 3258 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3259 if (error != 0) 3260 return (error); 3261 #ifdef AUDIT 3262 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3263 AUDIT_ARG_VNODE1(fp->f_vnode); 3264 VOP_UNLOCK(fp->f_vnode); 3265 #endif 3266 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3267 fdrop(fp, td); 3268 return (error); 3269 } 3270 3271 int 3272 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3273 { 3274 3275 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3276 uap->times, UIO_USERSPACE, uap->flag)); 3277 } 3278 3279 int 3280 kern_utimensat(struct thread *td, int fd, const char *path, 3281 enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg, 3282 int flag) 3283 { 3284 struct nameidata nd; 3285 struct timespec ts[2]; 3286 int error, flags; 3287 3288 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 3289 return (EINVAL); 3290 3291 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3292 return (error); 3293 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 3294 FOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0) | AUDITVNODE1, 3295 pathseg, path, fd, &cap_futimes_rights, td); 3296 if ((error = namei(&nd)) != 0) 3297 return (error); 3298 /* 3299 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3300 * POSIX states: 3301 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3302 * "Search permission is denied by a component of the path prefix." 3303 */ 3304 NDFREE(&nd, NDF_ONLY_PNBUF); 3305 if ((flags & UTIMENS_EXIT) == 0) 3306 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3307 vrele(nd.ni_vp); 3308 return (error); 3309 } 3310 3311 /* 3312 * Truncate a file given its path name. 3313 */ 3314 #ifndef _SYS_SYSPROTO_H_ 3315 struct truncate_args { 3316 char *path; 3317 int pad; 3318 off_t length; 3319 }; 3320 #endif 3321 int 3322 sys_truncate(struct thread *td, struct truncate_args *uap) 3323 { 3324 3325 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3326 } 3327 3328 int 3329 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3330 off_t length) 3331 { 3332 struct mount *mp; 3333 struct vnode *vp; 3334 void *rl_cookie; 3335 struct vattr vattr; 3336 struct nameidata nd; 3337 int error; 3338 3339 if (length < 0) 3340 return(EINVAL); 3341 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3342 if ((error = namei(&nd)) != 0) 3343 return (error); 3344 vp = nd.ni_vp; 3345 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3346 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3347 vn_rangelock_unlock(vp, rl_cookie); 3348 vrele(vp); 3349 return (error); 3350 } 3351 NDFREE(&nd, NDF_ONLY_PNBUF); 3352 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3353 if (vp->v_type == VDIR) 3354 error = EISDIR; 3355 #ifdef MAC 3356 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3357 } 3358 #endif 3359 else if ((error = vn_writechk(vp)) == 0 && 3360 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3361 VATTR_NULL(&vattr); 3362 vattr.va_size = length; 3363 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3364 } 3365 VOP_UNLOCK(vp); 3366 vn_finished_write(mp); 3367 vn_rangelock_unlock(vp, rl_cookie); 3368 vrele(vp); 3369 return (error); 3370 } 3371 3372 #if defined(COMPAT_43) 3373 /* 3374 * Truncate a file given its path name. 3375 */ 3376 #ifndef _SYS_SYSPROTO_H_ 3377 struct otruncate_args { 3378 char *path; 3379 long length; 3380 }; 3381 #endif 3382 int 3383 otruncate(struct thread *td, struct otruncate_args *uap) 3384 { 3385 3386 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3387 } 3388 #endif /* COMPAT_43 */ 3389 3390 #if defined(COMPAT_FREEBSD6) 3391 /* Versions with the pad argument */ 3392 int 3393 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3394 { 3395 3396 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3397 } 3398 3399 int 3400 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3401 { 3402 3403 return (kern_ftruncate(td, uap->fd, uap->length)); 3404 } 3405 #endif 3406 3407 int 3408 kern_fsync(struct thread *td, int fd, bool fullsync) 3409 { 3410 struct vnode *vp; 3411 struct mount *mp; 3412 struct file *fp; 3413 int error, lock_flags; 3414 3415 AUDIT_ARG_FD(fd); 3416 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3417 if (error != 0) 3418 return (error); 3419 vp = fp->f_vnode; 3420 #if 0 3421 if (!fullsync) 3422 /* XXXKIB: compete outstanding aio writes */; 3423 #endif 3424 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3425 if (error != 0) 3426 goto drop; 3427 if (MNT_SHARED_WRITES(mp) || 3428 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3429 lock_flags = LK_SHARED; 3430 } else { 3431 lock_flags = LK_EXCLUSIVE; 3432 } 3433 vn_lock(vp, lock_flags | LK_RETRY); 3434 AUDIT_ARG_VNODE1(vp); 3435 if (vp->v_object != NULL) { 3436 VM_OBJECT_WLOCK(vp->v_object); 3437 vm_object_page_clean(vp->v_object, 0, 0, 0); 3438 VM_OBJECT_WUNLOCK(vp->v_object); 3439 } 3440 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3441 VOP_UNLOCK(vp); 3442 vn_finished_write(mp); 3443 drop: 3444 fdrop(fp, td); 3445 return (error); 3446 } 3447 3448 /* 3449 * Sync an open file. 3450 */ 3451 #ifndef _SYS_SYSPROTO_H_ 3452 struct fsync_args { 3453 int fd; 3454 }; 3455 #endif 3456 int 3457 sys_fsync(struct thread *td, struct fsync_args *uap) 3458 { 3459 3460 return (kern_fsync(td, uap->fd, true)); 3461 } 3462 3463 int 3464 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3465 { 3466 3467 return (kern_fsync(td, uap->fd, false)); 3468 } 3469 3470 /* 3471 * Rename files. Source and destination must either both be directories, or 3472 * both not be directories. If target is a directory, it must be empty. 3473 */ 3474 #ifndef _SYS_SYSPROTO_H_ 3475 struct rename_args { 3476 char *from; 3477 char *to; 3478 }; 3479 #endif 3480 int 3481 sys_rename(struct thread *td, struct rename_args *uap) 3482 { 3483 3484 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3485 uap->to, UIO_USERSPACE)); 3486 } 3487 3488 #ifndef _SYS_SYSPROTO_H_ 3489 struct renameat_args { 3490 int oldfd; 3491 char *old; 3492 int newfd; 3493 char *new; 3494 }; 3495 #endif 3496 int 3497 sys_renameat(struct thread *td, struct renameat_args *uap) 3498 { 3499 3500 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3501 UIO_USERSPACE)); 3502 } 3503 3504 int 3505 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3506 const char *new, enum uio_seg pathseg) 3507 { 3508 struct mount *mp = NULL; 3509 struct vnode *tvp, *fvp, *tdvp; 3510 struct nameidata fromnd, tond; 3511 int error; 3512 3513 again: 3514 bwillwrite(); 3515 #ifdef MAC 3516 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3517 AUDITVNODE1, pathseg, old, oldfd, 3518 &cap_renameat_source_rights, td); 3519 #else 3520 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3521 pathseg, old, oldfd, 3522 &cap_renameat_source_rights, td); 3523 #endif 3524 3525 if ((error = namei(&fromnd)) != 0) 3526 return (error); 3527 #ifdef MAC 3528 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3529 fromnd.ni_vp, &fromnd.ni_cnd); 3530 VOP_UNLOCK(fromnd.ni_dvp); 3531 if (fromnd.ni_dvp != fromnd.ni_vp) 3532 VOP_UNLOCK(fromnd.ni_vp); 3533 #endif 3534 fvp = fromnd.ni_vp; 3535 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3536 SAVESTART | AUDITVNODE2, pathseg, new, newfd, 3537 &cap_renameat_target_rights, td); 3538 if (fromnd.ni_vp->v_type == VDIR) 3539 tond.ni_cnd.cn_flags |= WILLBEDIR; 3540 if ((error = namei(&tond)) != 0) { 3541 /* Translate error code for rename("dir1", "dir2/."). */ 3542 if (error == EISDIR && fvp->v_type == VDIR) 3543 error = EINVAL; 3544 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3545 vrele(fromnd.ni_dvp); 3546 vrele(fvp); 3547 goto out1; 3548 } 3549 tdvp = tond.ni_dvp; 3550 tvp = tond.ni_vp; 3551 error = vn_start_write(fvp, &mp, V_NOWAIT); 3552 if (error != 0) { 3553 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3554 NDFREE(&tond, NDF_ONLY_PNBUF); 3555 if (tvp != NULL) 3556 vput(tvp); 3557 if (tdvp == tvp) 3558 vrele(tdvp); 3559 else 3560 vput(tdvp); 3561 vrele(fromnd.ni_dvp); 3562 vrele(fvp); 3563 vrele(tond.ni_startdir); 3564 if (fromnd.ni_startdir != NULL) 3565 vrele(fromnd.ni_startdir); 3566 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3567 if (error != 0) 3568 return (error); 3569 goto again; 3570 } 3571 if (tvp != NULL) { 3572 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3573 error = ENOTDIR; 3574 goto out; 3575 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3576 error = EISDIR; 3577 goto out; 3578 } 3579 #ifdef CAPABILITIES 3580 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3581 /* 3582 * If the target already exists we require CAP_UNLINKAT 3583 * from 'newfd', when newfd was used for the lookup. 3584 */ 3585 error = cap_check(&tond.ni_filecaps.fc_rights, 3586 &cap_unlinkat_rights); 3587 if (error != 0) 3588 goto out; 3589 } 3590 #endif 3591 } 3592 if (fvp == tdvp) { 3593 error = EINVAL; 3594 goto out; 3595 } 3596 /* 3597 * If the source is the same as the destination (that is, if they 3598 * are links to the same vnode), then there is nothing to do. 3599 */ 3600 if (fvp == tvp) 3601 error = -1; 3602 #ifdef MAC 3603 else 3604 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3605 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3606 #endif 3607 out: 3608 if (error == 0) { 3609 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3610 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3611 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3612 NDFREE(&tond, NDF_ONLY_PNBUF); 3613 } else { 3614 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3615 NDFREE(&tond, NDF_ONLY_PNBUF); 3616 if (tvp != NULL) 3617 vput(tvp); 3618 if (tdvp == tvp) 3619 vrele(tdvp); 3620 else 3621 vput(tdvp); 3622 vrele(fromnd.ni_dvp); 3623 vrele(fvp); 3624 } 3625 vrele(tond.ni_startdir); 3626 vn_finished_write(mp); 3627 out1: 3628 if (fromnd.ni_startdir) 3629 vrele(fromnd.ni_startdir); 3630 if (error == -1) 3631 return (0); 3632 return (error); 3633 } 3634 3635 /* 3636 * Make a directory file. 3637 */ 3638 #ifndef _SYS_SYSPROTO_H_ 3639 struct mkdir_args { 3640 char *path; 3641 int mode; 3642 }; 3643 #endif 3644 int 3645 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3646 { 3647 3648 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3649 uap->mode)); 3650 } 3651 3652 #ifndef _SYS_SYSPROTO_H_ 3653 struct mkdirat_args { 3654 int fd; 3655 char *path; 3656 mode_t mode; 3657 }; 3658 #endif 3659 int 3660 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3661 { 3662 3663 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3664 } 3665 3666 int 3667 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3668 int mode) 3669 { 3670 struct mount *mp; 3671 struct vnode *vp; 3672 struct vattr vattr; 3673 struct nameidata nd; 3674 int error; 3675 3676 AUDIT_ARG_MODE(mode); 3677 restart: 3678 bwillwrite(); 3679 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3680 NOCACHE, segflg, path, fd, &cap_mkdirat_rights, 3681 td); 3682 nd.ni_cnd.cn_flags |= WILLBEDIR; 3683 if ((error = namei(&nd)) != 0) 3684 return (error); 3685 vp = nd.ni_vp; 3686 if (vp != NULL) { 3687 NDFREE(&nd, NDF_ONLY_PNBUF); 3688 /* 3689 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3690 * the strange behaviour of leaving the vnode unlocked 3691 * if the target is the same vnode as the parent. 3692 */ 3693 if (vp == nd.ni_dvp) 3694 vrele(nd.ni_dvp); 3695 else 3696 vput(nd.ni_dvp); 3697 vrele(vp); 3698 return (EEXIST); 3699 } 3700 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3701 NDFREE(&nd, NDF_ONLY_PNBUF); 3702 vput(nd.ni_dvp); 3703 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3704 return (error); 3705 goto restart; 3706 } 3707 VATTR_NULL(&vattr); 3708 vattr.va_type = VDIR; 3709 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3710 #ifdef MAC 3711 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3712 &vattr); 3713 if (error != 0) 3714 goto out; 3715 #endif 3716 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3717 #ifdef MAC 3718 out: 3719 #endif 3720 NDFREE(&nd, NDF_ONLY_PNBUF); 3721 vput(nd.ni_dvp); 3722 if (error == 0) 3723 vput(nd.ni_vp); 3724 vn_finished_write(mp); 3725 return (error); 3726 } 3727 3728 /* 3729 * Remove a directory file. 3730 */ 3731 #ifndef _SYS_SYSPROTO_H_ 3732 struct rmdir_args { 3733 char *path; 3734 }; 3735 #endif 3736 int 3737 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3738 { 3739 3740 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3741 0)); 3742 } 3743 3744 int 3745 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3746 enum uio_seg pathseg, int flag) 3747 { 3748 struct mount *mp; 3749 struct vnode *vp; 3750 struct file *fp; 3751 struct nameidata nd; 3752 cap_rights_t rights; 3753 int error; 3754 3755 fp = NULL; 3756 if (fd != FD_NONE) { 3757 error = getvnode(td, fd, cap_rights_init(&rights, CAP_LOOKUP), 3758 &fp); 3759 if (error != 0) 3760 return (error); 3761 } 3762 3763 restart: 3764 bwillwrite(); 3765 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3766 ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 3767 pathseg, path, dfd, &cap_unlinkat_rights, td); 3768 if ((error = namei(&nd)) != 0) 3769 goto fdout; 3770 vp = nd.ni_vp; 3771 if (vp->v_type != VDIR) { 3772 error = ENOTDIR; 3773 goto out; 3774 } 3775 /* 3776 * No rmdir "." please. 3777 */ 3778 if (nd.ni_dvp == vp) { 3779 error = EINVAL; 3780 goto out; 3781 } 3782 /* 3783 * The root of a mounted filesystem cannot be deleted. 3784 */ 3785 if (vp->v_vflag & VV_ROOT) { 3786 error = EBUSY; 3787 goto out; 3788 } 3789 3790 if (fp != NULL && fp->f_vnode != vp) { 3791 if (VN_IS_DOOMED(fp->f_vnode)) 3792 error = EBADF; 3793 else 3794 error = EDEADLK; 3795 goto out; 3796 } 3797 3798 #ifdef MAC 3799 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3800 &nd.ni_cnd); 3801 if (error != 0) 3802 goto out; 3803 #endif 3804 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3805 NDFREE(&nd, NDF_ONLY_PNBUF); 3806 vput(vp); 3807 if (nd.ni_dvp == vp) 3808 vrele(nd.ni_dvp); 3809 else 3810 vput(nd.ni_dvp); 3811 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3812 goto fdout; 3813 goto restart; 3814 } 3815 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3816 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3817 vn_finished_write(mp); 3818 out: 3819 NDFREE(&nd, NDF_ONLY_PNBUF); 3820 vput(vp); 3821 if (nd.ni_dvp == vp) 3822 vrele(nd.ni_dvp); 3823 else 3824 vput(nd.ni_dvp); 3825 fdout: 3826 if (fp != NULL) 3827 fdrop(fp, td); 3828 return (error); 3829 } 3830 3831 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3832 int 3833 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3834 long *basep, void (*func)(struct freebsd11_dirent *)) 3835 { 3836 struct freebsd11_dirent dstdp; 3837 struct dirent *dp, *edp; 3838 char *dirbuf; 3839 off_t base; 3840 ssize_t resid, ucount; 3841 int error; 3842 3843 /* XXX arbitrary sanity limit on `count'. */ 3844 count = min(count, 64 * 1024); 3845 3846 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3847 3848 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3849 UIO_SYSSPACE); 3850 if (error != 0) 3851 goto done; 3852 if (basep != NULL) 3853 *basep = base; 3854 3855 ucount = 0; 3856 for (dp = (struct dirent *)dirbuf, 3857 edp = (struct dirent *)&dirbuf[count - resid]; 3858 ucount < count && dp < edp; ) { 3859 if (dp->d_reclen == 0) 3860 break; 3861 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3862 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3863 continue; 3864 dstdp.d_type = dp->d_type; 3865 dstdp.d_namlen = dp->d_namlen; 3866 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3867 if (dstdp.d_fileno != dp->d_fileno) { 3868 switch (ino64_trunc_error) { 3869 default: 3870 case 0: 3871 break; 3872 case 1: 3873 error = EOVERFLOW; 3874 goto done; 3875 case 2: 3876 dstdp.d_fileno = UINT32_MAX; 3877 break; 3878 } 3879 } 3880 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3881 ((dp->d_namlen + 1 + 3) &~ 3); 3882 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3883 bzero(dstdp.d_name + dstdp.d_namlen, 3884 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3885 dstdp.d_namlen); 3886 MPASS(dstdp.d_reclen <= dp->d_reclen); 3887 MPASS(ucount + dstdp.d_reclen <= count); 3888 if (func != NULL) 3889 func(&dstdp); 3890 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3891 if (error != 0) 3892 break; 3893 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3894 ucount += dstdp.d_reclen; 3895 } 3896 3897 done: 3898 free(dirbuf, M_TEMP); 3899 if (error == 0) 3900 td->td_retval[0] = ucount; 3901 return (error); 3902 } 3903 #endif /* COMPAT */ 3904 3905 #ifdef COMPAT_43 3906 static void 3907 ogetdirentries_cvt(struct freebsd11_dirent *dp) 3908 { 3909 #if (BYTE_ORDER == LITTLE_ENDIAN) 3910 /* 3911 * The expected low byte of dp->d_namlen is our dp->d_type. 3912 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 3913 */ 3914 dp->d_type = dp->d_namlen; 3915 dp->d_namlen = 0; 3916 #else 3917 /* 3918 * The dp->d_type is the high byte of the expected dp->d_namlen, 3919 * so must be zero'ed. 3920 */ 3921 dp->d_type = 0; 3922 #endif 3923 } 3924 3925 /* 3926 * Read a block of directory entries in a filesystem independent format. 3927 */ 3928 #ifndef _SYS_SYSPROTO_H_ 3929 struct ogetdirentries_args { 3930 int fd; 3931 char *buf; 3932 u_int count; 3933 long *basep; 3934 }; 3935 #endif 3936 int 3937 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3938 { 3939 long loff; 3940 int error; 3941 3942 error = kern_ogetdirentries(td, uap, &loff); 3943 if (error == 0) 3944 error = copyout(&loff, uap->basep, sizeof(long)); 3945 return (error); 3946 } 3947 3948 int 3949 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3950 long *ploff) 3951 { 3952 long base; 3953 int error; 3954 3955 /* XXX arbitrary sanity limit on `count'. */ 3956 if (uap->count > 64 * 1024) 3957 return (EINVAL); 3958 3959 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3960 &base, ogetdirentries_cvt); 3961 3962 if (error == 0 && uap->basep != NULL) 3963 error = copyout(&base, uap->basep, sizeof(long)); 3964 3965 return (error); 3966 } 3967 #endif /* COMPAT_43 */ 3968 3969 #if defined(COMPAT_FREEBSD11) 3970 #ifndef _SYS_SYSPROTO_H_ 3971 struct freebsd11_getdirentries_args { 3972 int fd; 3973 char *buf; 3974 u_int count; 3975 long *basep; 3976 }; 3977 #endif 3978 int 3979 freebsd11_getdirentries(struct thread *td, 3980 struct freebsd11_getdirentries_args *uap) 3981 { 3982 long base; 3983 int error; 3984 3985 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3986 &base, NULL); 3987 3988 if (error == 0 && uap->basep != NULL) 3989 error = copyout(&base, uap->basep, sizeof(long)); 3990 return (error); 3991 } 3992 3993 int 3994 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 3995 { 3996 struct freebsd11_getdirentries_args ap; 3997 3998 ap.fd = uap->fd; 3999 ap.buf = uap->buf; 4000 ap.count = uap->count; 4001 ap.basep = NULL; 4002 return (freebsd11_getdirentries(td, &ap)); 4003 } 4004 #endif /* COMPAT_FREEBSD11 */ 4005 4006 /* 4007 * Read a block of directory entries in a filesystem independent format. 4008 */ 4009 int 4010 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4011 { 4012 off_t base; 4013 int error; 4014 4015 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4016 NULL, UIO_USERSPACE); 4017 if (error != 0) 4018 return (error); 4019 if (uap->basep != NULL) 4020 error = copyout(&base, uap->basep, sizeof(off_t)); 4021 return (error); 4022 } 4023 4024 int 4025 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4026 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4027 { 4028 struct vnode *vp; 4029 struct file *fp; 4030 struct uio auio; 4031 struct iovec aiov; 4032 off_t loff; 4033 int error, eofflag; 4034 off_t foffset; 4035 4036 AUDIT_ARG_FD(fd); 4037 if (count > IOSIZE_MAX) 4038 return (EINVAL); 4039 auio.uio_resid = count; 4040 error = getvnode(td, fd, &cap_read_rights, &fp); 4041 if (error != 0) 4042 return (error); 4043 if ((fp->f_flag & FREAD) == 0) { 4044 fdrop(fp, td); 4045 return (EBADF); 4046 } 4047 vp = fp->f_vnode; 4048 foffset = foffset_lock(fp, 0); 4049 unionread: 4050 if (vp->v_type != VDIR) { 4051 error = EINVAL; 4052 goto fail; 4053 } 4054 aiov.iov_base = buf; 4055 aiov.iov_len = count; 4056 auio.uio_iov = &aiov; 4057 auio.uio_iovcnt = 1; 4058 auio.uio_rw = UIO_READ; 4059 auio.uio_segflg = bufseg; 4060 auio.uio_td = td; 4061 vn_lock(vp, LK_SHARED | LK_RETRY); 4062 AUDIT_ARG_VNODE1(vp); 4063 loff = auio.uio_offset = foffset; 4064 #ifdef MAC 4065 error = mac_vnode_check_readdir(td->td_ucred, vp); 4066 if (error == 0) 4067 #endif 4068 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4069 NULL); 4070 foffset = auio.uio_offset; 4071 if (error != 0) { 4072 VOP_UNLOCK(vp); 4073 goto fail; 4074 } 4075 if (count == auio.uio_resid && 4076 (vp->v_vflag & VV_ROOT) && 4077 (vp->v_mount->mnt_flag & MNT_UNION)) { 4078 struct vnode *tvp = vp; 4079 4080 vp = vp->v_mount->mnt_vnodecovered; 4081 VREF(vp); 4082 fp->f_vnode = vp; 4083 fp->f_data = vp; 4084 foffset = 0; 4085 vput(tvp); 4086 goto unionread; 4087 } 4088 VOP_UNLOCK(vp); 4089 *basep = loff; 4090 if (residp != NULL) 4091 *residp = auio.uio_resid; 4092 td->td_retval[0] = count - auio.uio_resid; 4093 fail: 4094 foffset_unlock(fp, foffset, 0); 4095 fdrop(fp, td); 4096 return (error); 4097 } 4098 4099 /* 4100 * Set the mode mask for creation of filesystem nodes. 4101 */ 4102 #ifndef _SYS_SYSPROTO_H_ 4103 struct umask_args { 4104 int newmask; 4105 }; 4106 #endif 4107 int 4108 sys_umask(struct thread *td, struct umask_args *uap) 4109 { 4110 struct filedesc *fdp; 4111 4112 fdp = td->td_proc->p_fd; 4113 FILEDESC_XLOCK(fdp); 4114 td->td_retval[0] = fdp->fd_cmask; 4115 fdp->fd_cmask = uap->newmask & ALLPERMS; 4116 FILEDESC_XUNLOCK(fdp); 4117 return (0); 4118 } 4119 4120 /* 4121 * Void all references to file by ripping underlying filesystem away from 4122 * vnode. 4123 */ 4124 #ifndef _SYS_SYSPROTO_H_ 4125 struct revoke_args { 4126 char *path; 4127 }; 4128 #endif 4129 int 4130 sys_revoke(struct thread *td, struct revoke_args *uap) 4131 { 4132 struct vnode *vp; 4133 struct vattr vattr; 4134 struct nameidata nd; 4135 int error; 4136 4137 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4138 uap->path, td); 4139 if ((error = namei(&nd)) != 0) 4140 return (error); 4141 vp = nd.ni_vp; 4142 NDFREE(&nd, NDF_ONLY_PNBUF); 4143 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4144 error = EINVAL; 4145 goto out; 4146 } 4147 #ifdef MAC 4148 error = mac_vnode_check_revoke(td->td_ucred, vp); 4149 if (error != 0) 4150 goto out; 4151 #endif 4152 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4153 if (error != 0) 4154 goto out; 4155 if (td->td_ucred->cr_uid != vattr.va_uid) { 4156 error = priv_check(td, PRIV_VFS_ADMIN); 4157 if (error != 0) 4158 goto out; 4159 } 4160 if (vp->v_usecount > 1 || vcount(vp) > 1) 4161 VOP_REVOKE(vp, REVOKEALL); 4162 out: 4163 vput(vp); 4164 return (error); 4165 } 4166 4167 /* 4168 * Convert a user file descriptor to a kernel file entry and check that, if it 4169 * is a capability, the correct rights are present. A reference on the file 4170 * entry is held upon returning. 4171 */ 4172 int 4173 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4174 { 4175 struct file *fp; 4176 int error; 4177 4178 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); 4179 if (error != 0) 4180 return (error); 4181 4182 /* 4183 * The file could be not of the vnode type, or it may be not 4184 * yet fully initialized, in which case the f_vnode pointer 4185 * may be set, but f_ops is still badfileops. E.g., 4186 * devfs_open() transiently create such situation to 4187 * facilitate csw d_fdopen(). 4188 * 4189 * Dupfdopen() handling in kern_openat() installs the 4190 * half-baked file into the process descriptor table, allowing 4191 * other thread to dereference it. Guard against the race by 4192 * checking f_ops. 4193 */ 4194 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4195 fdrop(fp, td); 4196 return (EINVAL); 4197 } 4198 *fpp = fp; 4199 return (0); 4200 } 4201 4202 /* 4203 * Get an (NFS) file handle. 4204 */ 4205 #ifndef _SYS_SYSPROTO_H_ 4206 struct lgetfh_args { 4207 char *fname; 4208 fhandle_t *fhp; 4209 }; 4210 #endif 4211 int 4212 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4213 { 4214 4215 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4216 UIO_USERSPACE, uap->fhp)); 4217 } 4218 4219 #ifndef _SYS_SYSPROTO_H_ 4220 struct getfh_args { 4221 char *fname; 4222 fhandle_t *fhp; 4223 }; 4224 #endif 4225 int 4226 sys_getfh(struct thread *td, struct getfh_args *uap) 4227 { 4228 4229 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4230 uap->fhp)); 4231 } 4232 4233 /* 4234 * syscall for the rpc.lockd to use to translate an open descriptor into 4235 * a NFS file handle. 4236 * 4237 * warning: do not remove the priv_check() call or this becomes one giant 4238 * security hole. 4239 */ 4240 #ifndef _SYS_SYSPROTO_H_ 4241 struct getfhat_args { 4242 int fd; 4243 char *path; 4244 fhandle_t *fhp; 4245 int flags; 4246 }; 4247 #endif 4248 int 4249 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4250 { 4251 4252 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 4253 return (EINVAL); 4254 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4255 uap->fhp)); 4256 } 4257 4258 static int 4259 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4260 enum uio_seg pathseg, fhandle_t *fhp) 4261 { 4262 struct nameidata nd; 4263 fhandle_t fh; 4264 struct vnode *vp; 4265 int error; 4266 4267 error = priv_check(td, PRIV_VFS_GETFH); 4268 if (error != 0) 4269 return (error); 4270 NDINIT_AT(&nd, LOOKUP, ((flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 4271 FOLLOW) | ((flags & AT_BENEATH) != 0 ? BENEATH : 0) | LOCKLEAF | 4272 AUDITVNODE1, pathseg, path, fd, td); 4273 error = namei(&nd); 4274 if (error != 0) 4275 return (error); 4276 NDFREE(&nd, NDF_ONLY_PNBUF); 4277 vp = nd.ni_vp; 4278 bzero(&fh, sizeof(fh)); 4279 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4280 error = VOP_VPTOFH(vp, &fh.fh_fid); 4281 vput(vp); 4282 if (error == 0) 4283 error = copyout(&fh, fhp, sizeof (fh)); 4284 return (error); 4285 } 4286 4287 #ifndef _SYS_SYSPROTO_H_ 4288 struct fhlink_args { 4289 fhandle_t *fhp; 4290 const char *to; 4291 }; 4292 #endif 4293 int 4294 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4295 { 4296 4297 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4298 } 4299 4300 #ifndef _SYS_SYSPROTO_H_ 4301 struct fhlinkat_args { 4302 fhandle_t *fhp; 4303 int tofd; 4304 const char *to; 4305 }; 4306 #endif 4307 int 4308 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4309 { 4310 4311 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4312 } 4313 4314 static int 4315 kern_fhlinkat(struct thread *td, int fd, const char *path, 4316 enum uio_seg pathseg, fhandle_t *fhp) 4317 { 4318 fhandle_t fh; 4319 struct mount *mp; 4320 struct vnode *vp; 4321 int error; 4322 4323 error = priv_check(td, PRIV_VFS_GETFH); 4324 if (error != 0) 4325 return (error); 4326 error = copyin(fhp, &fh, sizeof(fh)); 4327 if (error != 0) 4328 return (error); 4329 do { 4330 bwillwrite(); 4331 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4332 return (ESTALE); 4333 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4334 vfs_unbusy(mp); 4335 if (error != 0) 4336 return (error); 4337 VOP_UNLOCK(vp); 4338 } while ((error = kern_linkat_vp(td, vp, fd, path, pathseg)) == EAGAIN); 4339 return (error); 4340 } 4341 4342 #ifndef _SYS_SYSPROTO_H_ 4343 struct fhreadlink_args { 4344 fhandle_t *fhp; 4345 char *buf; 4346 size_t bufsize; 4347 }; 4348 #endif 4349 int 4350 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4351 { 4352 fhandle_t fh; 4353 struct mount *mp; 4354 struct vnode *vp; 4355 int error; 4356 4357 error = priv_check(td, PRIV_VFS_GETFH); 4358 if (error != 0) 4359 return (error); 4360 if (uap->bufsize > IOSIZE_MAX) 4361 return (EINVAL); 4362 error = copyin(uap->fhp, &fh, sizeof(fh)); 4363 if (error != 0) 4364 return (error); 4365 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4366 return (ESTALE); 4367 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4368 vfs_unbusy(mp); 4369 if (error != 0) 4370 return (error); 4371 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4372 vput(vp); 4373 return (error); 4374 } 4375 4376 /* 4377 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4378 * open descriptor. 4379 * 4380 * warning: do not remove the priv_check() call or this becomes one giant 4381 * security hole. 4382 */ 4383 #ifndef _SYS_SYSPROTO_H_ 4384 struct fhopen_args { 4385 const struct fhandle *u_fhp; 4386 int flags; 4387 }; 4388 #endif 4389 int 4390 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4391 { 4392 struct mount *mp; 4393 struct vnode *vp; 4394 struct fhandle fhp; 4395 struct file *fp; 4396 int fmode, error; 4397 int indx; 4398 4399 error = priv_check(td, PRIV_VFS_FHOPEN); 4400 if (error != 0) 4401 return (error); 4402 indx = -1; 4403 fmode = FFLAGS(uap->flags); 4404 /* why not allow a non-read/write open for our lockd? */ 4405 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4406 return (EINVAL); 4407 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4408 if (error != 0) 4409 return(error); 4410 /* find the mount point */ 4411 mp = vfs_busyfs(&fhp.fh_fsid); 4412 if (mp == NULL) 4413 return (ESTALE); 4414 /* now give me my vnode, it gets returned to me locked */ 4415 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4416 vfs_unbusy(mp); 4417 if (error != 0) 4418 return (error); 4419 4420 error = falloc_noinstall(td, &fp); 4421 if (error != 0) { 4422 vput(vp); 4423 return (error); 4424 } 4425 /* 4426 * An extra reference on `fp' has been held for us by 4427 * falloc_noinstall(). 4428 */ 4429 4430 #ifdef INVARIANTS 4431 td->td_dupfd = -1; 4432 #endif 4433 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4434 if (error != 0) { 4435 KASSERT(fp->f_ops == &badfileops, 4436 ("VOP_OPEN in fhopen() set f_ops")); 4437 KASSERT(td->td_dupfd < 0, 4438 ("fhopen() encountered fdopen()")); 4439 4440 vput(vp); 4441 goto bad; 4442 } 4443 #ifdef INVARIANTS 4444 td->td_dupfd = 0; 4445 #endif 4446 fp->f_vnode = vp; 4447 fp->f_seqcount = 1; 4448 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp, 4449 &vnops); 4450 VOP_UNLOCK(vp); 4451 if ((fmode & O_TRUNC) != 0) { 4452 error = fo_truncate(fp, 0, td->td_ucred, td); 4453 if (error != 0) 4454 goto bad; 4455 } 4456 4457 error = finstall(td, fp, &indx, fmode, NULL); 4458 bad: 4459 fdrop(fp, td); 4460 td->td_retval[0] = indx; 4461 return (error); 4462 } 4463 4464 /* 4465 * Stat an (NFS) file handle. 4466 */ 4467 #ifndef _SYS_SYSPROTO_H_ 4468 struct fhstat_args { 4469 struct fhandle *u_fhp; 4470 struct stat *sb; 4471 }; 4472 #endif 4473 int 4474 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4475 { 4476 struct stat sb; 4477 struct fhandle fh; 4478 int error; 4479 4480 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4481 if (error != 0) 4482 return (error); 4483 error = kern_fhstat(td, fh, &sb); 4484 if (error == 0) 4485 error = copyout(&sb, uap->sb, sizeof(sb)); 4486 return (error); 4487 } 4488 4489 int 4490 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4491 { 4492 struct mount *mp; 4493 struct vnode *vp; 4494 int error; 4495 4496 error = priv_check(td, PRIV_VFS_FHSTAT); 4497 if (error != 0) 4498 return (error); 4499 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4500 return (ESTALE); 4501 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4502 vfs_unbusy(mp); 4503 if (error != 0) 4504 return (error); 4505 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td); 4506 vput(vp); 4507 return (error); 4508 } 4509 4510 /* 4511 * Implement fstatfs() for (NFS) file handles. 4512 */ 4513 #ifndef _SYS_SYSPROTO_H_ 4514 struct fhstatfs_args { 4515 struct fhandle *u_fhp; 4516 struct statfs *buf; 4517 }; 4518 #endif 4519 int 4520 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4521 { 4522 struct statfs *sfp; 4523 fhandle_t fh; 4524 int error; 4525 4526 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4527 if (error != 0) 4528 return (error); 4529 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4530 error = kern_fhstatfs(td, fh, sfp); 4531 if (error == 0) 4532 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4533 free(sfp, M_STATFS); 4534 return (error); 4535 } 4536 4537 int 4538 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4539 { 4540 struct mount *mp; 4541 struct vnode *vp; 4542 int error; 4543 4544 error = priv_check(td, PRIV_VFS_FHSTATFS); 4545 if (error != 0) 4546 return (error); 4547 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4548 return (ESTALE); 4549 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4550 if (error != 0) { 4551 vfs_unbusy(mp); 4552 return (error); 4553 } 4554 vput(vp); 4555 error = prison_canseemount(td->td_ucred, mp); 4556 if (error != 0) 4557 goto out; 4558 #ifdef MAC 4559 error = mac_mount_check_stat(td->td_ucred, mp); 4560 if (error != 0) 4561 goto out; 4562 #endif 4563 error = VFS_STATFS(mp, buf); 4564 out: 4565 vfs_unbusy(mp); 4566 return (error); 4567 } 4568 4569 /* 4570 * Unlike madvise(2), we do not make a best effort to remember every 4571 * possible caching hint. Instead, we remember the last setting with 4572 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4573 * region of any current setting. 4574 */ 4575 int 4576 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4577 int advice) 4578 { 4579 struct fadvise_info *fa, *new; 4580 struct file *fp; 4581 struct vnode *vp; 4582 off_t end; 4583 int error; 4584 4585 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4586 return (EINVAL); 4587 AUDIT_ARG_VALUE(advice); 4588 switch (advice) { 4589 case POSIX_FADV_SEQUENTIAL: 4590 case POSIX_FADV_RANDOM: 4591 case POSIX_FADV_NOREUSE: 4592 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4593 break; 4594 case POSIX_FADV_NORMAL: 4595 case POSIX_FADV_WILLNEED: 4596 case POSIX_FADV_DONTNEED: 4597 new = NULL; 4598 break; 4599 default: 4600 return (EINVAL); 4601 } 4602 /* XXX: CAP_POSIX_FADVISE? */ 4603 AUDIT_ARG_FD(fd); 4604 error = fget(td, fd, &cap_no_rights, &fp); 4605 if (error != 0) 4606 goto out; 4607 AUDIT_ARG_FILE(td->td_proc, fp); 4608 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4609 error = ESPIPE; 4610 goto out; 4611 } 4612 if (fp->f_type != DTYPE_VNODE) { 4613 error = ENODEV; 4614 goto out; 4615 } 4616 vp = fp->f_vnode; 4617 if (vp->v_type != VREG) { 4618 error = ENODEV; 4619 goto out; 4620 } 4621 if (len == 0) 4622 end = OFF_MAX; 4623 else 4624 end = offset + len - 1; 4625 switch (advice) { 4626 case POSIX_FADV_SEQUENTIAL: 4627 case POSIX_FADV_RANDOM: 4628 case POSIX_FADV_NOREUSE: 4629 /* 4630 * Try to merge any existing non-standard region with 4631 * this new region if possible, otherwise create a new 4632 * non-standard region for this request. 4633 */ 4634 mtx_pool_lock(mtxpool_sleep, fp); 4635 fa = fp->f_advice; 4636 if (fa != NULL && fa->fa_advice == advice && 4637 ((fa->fa_start <= end && fa->fa_end >= offset) || 4638 (end != OFF_MAX && fa->fa_start == end + 1) || 4639 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4640 if (offset < fa->fa_start) 4641 fa->fa_start = offset; 4642 if (end > fa->fa_end) 4643 fa->fa_end = end; 4644 } else { 4645 new->fa_advice = advice; 4646 new->fa_start = offset; 4647 new->fa_end = end; 4648 fp->f_advice = new; 4649 new = fa; 4650 } 4651 mtx_pool_unlock(mtxpool_sleep, fp); 4652 break; 4653 case POSIX_FADV_NORMAL: 4654 /* 4655 * If a the "normal" region overlaps with an existing 4656 * non-standard region, trim or remove the 4657 * non-standard region. 4658 */ 4659 mtx_pool_lock(mtxpool_sleep, fp); 4660 fa = fp->f_advice; 4661 if (fa != NULL) { 4662 if (offset <= fa->fa_start && end >= fa->fa_end) { 4663 new = fa; 4664 fp->f_advice = NULL; 4665 } else if (offset <= fa->fa_start && 4666 end >= fa->fa_start) 4667 fa->fa_start = end + 1; 4668 else if (offset <= fa->fa_end && end >= fa->fa_end) 4669 fa->fa_end = offset - 1; 4670 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4671 /* 4672 * If the "normal" region is a middle 4673 * portion of the existing 4674 * non-standard region, just remove 4675 * the whole thing rather than picking 4676 * one side or the other to 4677 * preserve. 4678 */ 4679 new = fa; 4680 fp->f_advice = NULL; 4681 } 4682 } 4683 mtx_pool_unlock(mtxpool_sleep, fp); 4684 break; 4685 case POSIX_FADV_WILLNEED: 4686 case POSIX_FADV_DONTNEED: 4687 error = VOP_ADVISE(vp, offset, end, advice); 4688 break; 4689 } 4690 out: 4691 if (fp != NULL) 4692 fdrop(fp, td); 4693 free(new, M_FADVISE); 4694 return (error); 4695 } 4696 4697 int 4698 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4699 { 4700 int error; 4701 4702 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4703 uap->advice); 4704 return (kern_posix_error(td, error)); 4705 } 4706 4707 int 4708 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, 4709 off_t *outoffp, size_t len, unsigned int flags) 4710 { 4711 struct file *infp, *outfp; 4712 struct vnode *invp, *outvp; 4713 int error; 4714 size_t retlen; 4715 void *rl_rcookie, *rl_wcookie; 4716 off_t savinoff, savoutoff; 4717 4718 infp = outfp = NULL; 4719 rl_rcookie = rl_wcookie = NULL; 4720 savinoff = -1; 4721 error = 0; 4722 retlen = 0; 4723 4724 if (flags != 0) { 4725 error = EINVAL; 4726 goto out; 4727 } 4728 if (len > SSIZE_MAX) 4729 /* 4730 * Although the len argument is size_t, the return argument 4731 * is ssize_t (which is signed). Therefore a size that won't 4732 * fit in ssize_t can't be returned. 4733 */ 4734 len = SSIZE_MAX; 4735 4736 /* Get the file structures for the file descriptors. */ 4737 error = fget_read(td, infd, &cap_read_rights, &infp); 4738 if (error != 0) 4739 goto out; 4740 error = fget_write(td, outfd, &cap_write_rights, &outfp); 4741 if (error != 0) 4742 goto out; 4743 4744 /* Set the offset pointers to the correct place. */ 4745 if (inoffp == NULL) 4746 inoffp = &infp->f_offset; 4747 if (outoffp == NULL) 4748 outoffp = &outfp->f_offset; 4749 savinoff = *inoffp; 4750 savoutoff = *outoffp; 4751 4752 invp = infp->f_vnode; 4753 outvp = outfp->f_vnode; 4754 /* Sanity check the f_flag bits. */ 4755 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 4756 (infp->f_flag & FREAD) == 0) { 4757 error = EBADF; 4758 goto out; 4759 } 4760 4761 /* If len == 0, just return 0. */ 4762 if (len == 0) 4763 goto out; 4764 4765 /* 4766 * If infp and outfp refer to the same file, the byte ranges cannot 4767 * overlap. 4768 */ 4769 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len > 4770 savoutoff) || (savinoff > savoutoff && savoutoff + len > 4771 savinoff))) { 4772 error = EINVAL; 4773 goto out; 4774 } 4775 4776 /* Range lock the byte ranges for both invp and outvp. */ 4777 for (;;) { 4778 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp + 4779 len); 4780 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp + 4781 len); 4782 if (rl_rcookie != NULL) 4783 break; 4784 vn_rangelock_unlock(outvp, rl_wcookie); 4785 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len); 4786 vn_rangelock_unlock(invp, rl_rcookie); 4787 } 4788 4789 retlen = len; 4790 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen, 4791 flags, infp->f_cred, outfp->f_cred, td); 4792 out: 4793 if (rl_rcookie != NULL) 4794 vn_rangelock_unlock(invp, rl_rcookie); 4795 if (rl_wcookie != NULL) 4796 vn_rangelock_unlock(outvp, rl_wcookie); 4797 if (savinoff != -1 && (error == EINTR || error == ERESTART)) { 4798 *inoffp = savinoff; 4799 *outoffp = savoutoff; 4800 } 4801 if (outfp != NULL) 4802 fdrop(outfp, td); 4803 if (infp != NULL) 4804 fdrop(infp, td); 4805 td->td_retval[0] = retlen; 4806 return (error); 4807 } 4808 4809 int 4810 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 4811 { 4812 off_t inoff, outoff, *inoffp, *outoffp; 4813 int error; 4814 4815 inoffp = outoffp = NULL; 4816 if (uap->inoffp != NULL) { 4817 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 4818 if (error != 0) 4819 return (error); 4820 inoffp = &inoff; 4821 } 4822 if (uap->outoffp != NULL) { 4823 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 4824 if (error != 0) 4825 return (error); 4826 outoffp = &outoff; 4827 } 4828 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 4829 outoffp, uap->len, uap->flags); 4830 if (error == 0 && uap->inoffp != NULL) 4831 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 4832 if (error == 0 && uap->outoffp != NULL) 4833 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 4834 return (error); 4835 } 4836