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_cred_vfs_generation(td->td_ucred)) { 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_cred_vfs_generation(td->td_ucred)) { 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_one(rightsp, CAP_FEXECVE); 970 } else { 971 switch ((flags & O_ACCMODE)) { 972 case O_RDONLY: 973 cap_rights_set_one(rightsp, CAP_READ); 974 break; 975 case O_RDWR: 976 cap_rights_set_one(rightsp, CAP_READ); 977 /* FALLTHROUGH */ 978 case O_WRONLY: 979 cap_rights_set_one(rightsp, CAP_WRITE); 980 if (!(flags & (O_APPEND | O_TRUNC))) 981 cap_rights_set_one(rightsp, CAP_SEEK); 982 break; 983 } 984 } 985 986 if (flags & O_CREAT) 987 cap_rights_set_one(rightsp, CAP_CREATE); 988 989 if (flags & O_TRUNC) 990 cap_rights_set_one(rightsp, CAP_FTRUNCATE); 991 992 if (flags & (O_SYNC | O_FSYNC)) 993 cap_rights_set_one(rightsp, CAP_FSYNC); 994 995 if (flags & (O_EXLOCK | O_SHLOCK)) 996 cap_rights_set_one(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_one(&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[UIO_READ] = 1; 1128 fp->f_seqcount[UIO_WRITE] = 1; 1129 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK), 1130 DTYPE_VNODE, vp, &vnops); 1131 } 1132 1133 VOP_UNLOCK(vp); 1134 if (flags & O_TRUNC) { 1135 error = fo_truncate(fp, 0, td->td_ucred, td); 1136 if (error != 0) 1137 goto bad; 1138 } 1139 success: 1140 /* 1141 * If we haven't already installed the FD (for dupfdopen), do so now. 1142 */ 1143 if (indx == -1) { 1144 struct filecaps *fcaps; 1145 1146 #ifdef CAPABILITIES 1147 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0) 1148 fcaps = &nd.ni_filecaps; 1149 else 1150 #endif 1151 fcaps = NULL; 1152 error = finstall(td, fp, &indx, flags, fcaps); 1153 /* On success finstall() consumes fcaps. */ 1154 if (error != 0) { 1155 filecaps_free(&nd.ni_filecaps); 1156 goto bad; 1157 } 1158 } else { 1159 filecaps_free(&nd.ni_filecaps); 1160 } 1161 1162 /* 1163 * Release our private reference, leaving the one associated with 1164 * the descriptor table intact. 1165 */ 1166 fdrop(fp, td); 1167 td->td_retval[0] = indx; 1168 return (0); 1169 bad: 1170 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1171 fdrop(fp, td); 1172 return (error); 1173 } 1174 1175 #ifdef COMPAT_43 1176 /* 1177 * Create a file. 1178 */ 1179 #ifndef _SYS_SYSPROTO_H_ 1180 struct ocreat_args { 1181 char *path; 1182 int mode; 1183 }; 1184 #endif 1185 int 1186 ocreat(struct thread *td, struct ocreat_args *uap) 1187 { 1188 1189 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1190 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1191 } 1192 #endif /* COMPAT_43 */ 1193 1194 /* 1195 * Create a special file. 1196 */ 1197 #ifndef _SYS_SYSPROTO_H_ 1198 struct mknodat_args { 1199 int fd; 1200 char *path; 1201 mode_t mode; 1202 dev_t dev; 1203 }; 1204 #endif 1205 int 1206 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1207 { 1208 1209 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1210 uap->dev)); 1211 } 1212 1213 #if defined(COMPAT_FREEBSD11) 1214 int 1215 freebsd11_mknod(struct thread *td, 1216 struct freebsd11_mknod_args *uap) 1217 { 1218 1219 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1220 uap->mode, uap->dev)); 1221 } 1222 1223 int 1224 freebsd11_mknodat(struct thread *td, 1225 struct freebsd11_mknodat_args *uap) 1226 { 1227 1228 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1229 uap->dev)); 1230 } 1231 #endif /* COMPAT_FREEBSD11 */ 1232 1233 int 1234 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, 1235 int mode, dev_t dev) 1236 { 1237 struct vnode *vp; 1238 struct mount *mp; 1239 struct vattr vattr; 1240 struct nameidata nd; 1241 int error, whiteout = 0; 1242 1243 AUDIT_ARG_MODE(mode); 1244 AUDIT_ARG_DEV(dev); 1245 switch (mode & S_IFMT) { 1246 case S_IFCHR: 1247 case S_IFBLK: 1248 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1249 if (error == 0 && dev == VNOVAL) 1250 error = EINVAL; 1251 break; 1252 case S_IFWHT: 1253 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1254 break; 1255 case S_IFIFO: 1256 if (dev == 0) 1257 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1258 /* FALLTHROUGH */ 1259 default: 1260 error = EINVAL; 1261 break; 1262 } 1263 if (error != 0) 1264 return (error); 1265 restart: 1266 bwillwrite(); 1267 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1268 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1269 td); 1270 if ((error = namei(&nd)) != 0) 1271 return (error); 1272 vp = nd.ni_vp; 1273 if (vp != NULL) { 1274 NDFREE(&nd, NDF_ONLY_PNBUF); 1275 if (vp == nd.ni_dvp) 1276 vrele(nd.ni_dvp); 1277 else 1278 vput(nd.ni_dvp); 1279 vrele(vp); 1280 return (EEXIST); 1281 } else { 1282 VATTR_NULL(&vattr); 1283 vattr.va_mode = (mode & ALLPERMS) & 1284 ~td->td_proc->p_fd->fd_cmask; 1285 vattr.va_rdev = dev; 1286 whiteout = 0; 1287 1288 switch (mode & S_IFMT) { 1289 case S_IFCHR: 1290 vattr.va_type = VCHR; 1291 break; 1292 case S_IFBLK: 1293 vattr.va_type = VBLK; 1294 break; 1295 case S_IFWHT: 1296 whiteout = 1; 1297 break; 1298 default: 1299 panic("kern_mknod: invalid mode"); 1300 } 1301 } 1302 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1303 NDFREE(&nd, NDF_ONLY_PNBUF); 1304 vput(nd.ni_dvp); 1305 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1306 return (error); 1307 goto restart; 1308 } 1309 #ifdef MAC 1310 if (error == 0 && !whiteout) 1311 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1312 &nd.ni_cnd, &vattr); 1313 #endif 1314 if (error == 0) { 1315 if (whiteout) 1316 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1317 else { 1318 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1319 &nd.ni_cnd, &vattr); 1320 if (error == 0) 1321 vput(nd.ni_vp); 1322 } 1323 } 1324 NDFREE(&nd, NDF_ONLY_PNBUF); 1325 vput(nd.ni_dvp); 1326 vn_finished_write(mp); 1327 return (error); 1328 } 1329 1330 /* 1331 * Create a named pipe. 1332 */ 1333 #ifndef _SYS_SYSPROTO_H_ 1334 struct mkfifo_args { 1335 char *path; 1336 int mode; 1337 }; 1338 #endif 1339 int 1340 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1341 { 1342 1343 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1344 uap->mode)); 1345 } 1346 1347 #ifndef _SYS_SYSPROTO_H_ 1348 struct mkfifoat_args { 1349 int fd; 1350 char *path; 1351 mode_t mode; 1352 }; 1353 #endif 1354 int 1355 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1356 { 1357 1358 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1359 uap->mode)); 1360 } 1361 1362 int 1363 kern_mkfifoat(struct thread *td, int fd, const char *path, 1364 enum uio_seg pathseg, int mode) 1365 { 1366 struct mount *mp; 1367 struct vattr vattr; 1368 struct nameidata nd; 1369 int error; 1370 1371 AUDIT_ARG_MODE(mode); 1372 restart: 1373 bwillwrite(); 1374 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1375 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1376 td); 1377 if ((error = namei(&nd)) != 0) 1378 return (error); 1379 if (nd.ni_vp != NULL) { 1380 NDFREE(&nd, NDF_ONLY_PNBUF); 1381 if (nd.ni_vp == nd.ni_dvp) 1382 vrele(nd.ni_dvp); 1383 else 1384 vput(nd.ni_dvp); 1385 vrele(nd.ni_vp); 1386 return (EEXIST); 1387 } 1388 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1389 NDFREE(&nd, NDF_ONLY_PNBUF); 1390 vput(nd.ni_dvp); 1391 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1392 return (error); 1393 goto restart; 1394 } 1395 VATTR_NULL(&vattr); 1396 vattr.va_type = VFIFO; 1397 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1398 #ifdef MAC 1399 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1400 &vattr); 1401 if (error != 0) 1402 goto out; 1403 #endif 1404 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1405 if (error == 0) 1406 vput(nd.ni_vp); 1407 #ifdef MAC 1408 out: 1409 #endif 1410 vput(nd.ni_dvp); 1411 vn_finished_write(mp); 1412 NDFREE(&nd, NDF_ONLY_PNBUF); 1413 return (error); 1414 } 1415 1416 /* 1417 * Make a hard file link. 1418 */ 1419 #ifndef _SYS_SYSPROTO_H_ 1420 struct link_args { 1421 char *path; 1422 char *link; 1423 }; 1424 #endif 1425 int 1426 sys_link(struct thread *td, struct link_args *uap) 1427 { 1428 1429 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1430 UIO_USERSPACE, FOLLOW)); 1431 } 1432 1433 #ifndef _SYS_SYSPROTO_H_ 1434 struct linkat_args { 1435 int fd1; 1436 char *path1; 1437 int fd2; 1438 char *path2; 1439 int flag; 1440 }; 1441 #endif 1442 int 1443 sys_linkat(struct thread *td, struct linkat_args *uap) 1444 { 1445 int flag; 1446 1447 flag = uap->flag; 1448 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_BENEATH)) != 0) 1449 return (EINVAL); 1450 1451 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1452 UIO_USERSPACE, ((flag & AT_SYMLINK_FOLLOW) != 0 ? FOLLOW : 1453 NOFOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0))); 1454 } 1455 1456 int hardlink_check_uid = 0; 1457 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1458 &hardlink_check_uid, 0, 1459 "Unprivileged processes cannot create hard links to files owned by other " 1460 "users"); 1461 static int hardlink_check_gid = 0; 1462 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1463 &hardlink_check_gid, 0, 1464 "Unprivileged processes cannot create hard links to files owned by other " 1465 "groups"); 1466 1467 static int 1468 can_hardlink(struct vnode *vp, struct ucred *cred) 1469 { 1470 struct vattr va; 1471 int error; 1472 1473 if (!hardlink_check_uid && !hardlink_check_gid) 1474 return (0); 1475 1476 error = VOP_GETATTR(vp, &va, cred); 1477 if (error != 0) 1478 return (error); 1479 1480 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1481 error = priv_check_cred(cred, PRIV_VFS_LINK); 1482 if (error != 0) 1483 return (error); 1484 } 1485 1486 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1487 error = priv_check_cred(cred, PRIV_VFS_LINK); 1488 if (error != 0) 1489 return (error); 1490 } 1491 1492 return (0); 1493 } 1494 1495 int 1496 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1, 1497 const char *path2, enum uio_seg segflag, int follow) 1498 { 1499 struct nameidata nd; 1500 int error; 1501 1502 do { 1503 bwillwrite(); 1504 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag, 1505 path1, fd1, &cap_linkat_source_rights, td); 1506 if ((error = namei(&nd)) != 0) 1507 return (error); 1508 NDFREE(&nd, NDF_ONLY_PNBUF); 1509 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1510 } while (error == EAGAIN); 1511 return (error); 1512 } 1513 1514 static int 1515 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1516 enum uio_seg segflag) 1517 { 1518 struct nameidata nd; 1519 struct mount *mp; 1520 int error; 1521 1522 if (vp->v_type == VDIR) { 1523 vrele(vp); 1524 return (EPERM); /* POSIX */ 1525 } 1526 NDINIT_ATRIGHTS(&nd, CREATE, 1527 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1528 &cap_linkat_target_rights, td); 1529 if ((error = namei(&nd)) == 0) { 1530 if (nd.ni_vp != NULL) { 1531 NDFREE(&nd, NDF_ONLY_PNBUF); 1532 if (nd.ni_dvp == nd.ni_vp) 1533 vrele(nd.ni_dvp); 1534 else 1535 vput(nd.ni_dvp); 1536 vrele(nd.ni_vp); 1537 vrele(vp); 1538 return (EEXIST); 1539 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1540 /* 1541 * Cross-device link. No need to recheck 1542 * vp->v_type, since it cannot change, except 1543 * to VBAD. 1544 */ 1545 NDFREE(&nd, NDF_ONLY_PNBUF); 1546 vput(nd.ni_dvp); 1547 vrele(vp); 1548 return (EXDEV); 1549 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1550 error = can_hardlink(vp, td->td_ucred); 1551 #ifdef MAC 1552 if (error == 0) 1553 error = mac_vnode_check_link(td->td_ucred, 1554 nd.ni_dvp, vp, &nd.ni_cnd); 1555 #endif 1556 if (error != 0) { 1557 vput(vp); 1558 vput(nd.ni_dvp); 1559 NDFREE(&nd, NDF_ONLY_PNBUF); 1560 return (error); 1561 } 1562 error = vn_start_write(vp, &mp, V_NOWAIT); 1563 if (error != 0) { 1564 vput(vp); 1565 vput(nd.ni_dvp); 1566 NDFREE(&nd, NDF_ONLY_PNBUF); 1567 error = vn_start_write(NULL, &mp, 1568 V_XSLEEP | PCATCH); 1569 if (error != 0) 1570 return (error); 1571 return (EAGAIN); 1572 } 1573 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1574 VOP_UNLOCK(vp); 1575 vput(nd.ni_dvp); 1576 vn_finished_write(mp); 1577 NDFREE(&nd, NDF_ONLY_PNBUF); 1578 } else { 1579 vput(nd.ni_dvp); 1580 NDFREE(&nd, NDF_ONLY_PNBUF); 1581 vrele(vp); 1582 return (EAGAIN); 1583 } 1584 } 1585 vrele(vp); 1586 return (error); 1587 } 1588 1589 /* 1590 * Make a symbolic link. 1591 */ 1592 #ifndef _SYS_SYSPROTO_H_ 1593 struct symlink_args { 1594 char *path; 1595 char *link; 1596 }; 1597 #endif 1598 int 1599 sys_symlink(struct thread *td, struct symlink_args *uap) 1600 { 1601 1602 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1603 UIO_USERSPACE)); 1604 } 1605 1606 #ifndef _SYS_SYSPROTO_H_ 1607 struct symlinkat_args { 1608 char *path; 1609 int fd; 1610 char *path2; 1611 }; 1612 #endif 1613 int 1614 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1615 { 1616 1617 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1618 UIO_USERSPACE)); 1619 } 1620 1621 int 1622 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, 1623 enum uio_seg segflg) 1624 { 1625 struct mount *mp; 1626 struct vattr vattr; 1627 const char *syspath; 1628 char *tmppath; 1629 struct nameidata nd; 1630 int error; 1631 1632 if (segflg == UIO_SYSSPACE) { 1633 syspath = path1; 1634 } else { 1635 tmppath = uma_zalloc(namei_zone, M_WAITOK); 1636 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) 1637 goto out; 1638 syspath = tmppath; 1639 } 1640 AUDIT_ARG_TEXT(syspath); 1641 restart: 1642 bwillwrite(); 1643 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1644 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1645 td); 1646 if ((error = namei(&nd)) != 0) 1647 goto out; 1648 if (nd.ni_vp) { 1649 NDFREE(&nd, NDF_ONLY_PNBUF); 1650 if (nd.ni_vp == nd.ni_dvp) 1651 vrele(nd.ni_dvp); 1652 else 1653 vput(nd.ni_dvp); 1654 vrele(nd.ni_vp); 1655 error = EEXIST; 1656 goto out; 1657 } 1658 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1659 NDFREE(&nd, NDF_ONLY_PNBUF); 1660 vput(nd.ni_dvp); 1661 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1662 goto out; 1663 goto restart; 1664 } 1665 VATTR_NULL(&vattr); 1666 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1667 #ifdef MAC 1668 vattr.va_type = VLNK; 1669 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1670 &vattr); 1671 if (error != 0) 1672 goto out2; 1673 #endif 1674 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1675 if (error == 0) 1676 vput(nd.ni_vp); 1677 #ifdef MAC 1678 out2: 1679 #endif 1680 NDFREE(&nd, NDF_ONLY_PNBUF); 1681 vput(nd.ni_dvp); 1682 vn_finished_write(mp); 1683 out: 1684 if (segflg != UIO_SYSSPACE) 1685 uma_zfree(namei_zone, tmppath); 1686 return (error); 1687 } 1688 1689 /* 1690 * Delete a whiteout from the filesystem. 1691 */ 1692 #ifndef _SYS_SYSPROTO_H_ 1693 struct undelete_args { 1694 char *path; 1695 }; 1696 #endif 1697 int 1698 sys_undelete(struct thread *td, struct undelete_args *uap) 1699 { 1700 struct mount *mp; 1701 struct nameidata nd; 1702 int error; 1703 1704 restart: 1705 bwillwrite(); 1706 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1707 UIO_USERSPACE, uap->path, td); 1708 error = namei(&nd); 1709 if (error != 0) 1710 return (error); 1711 1712 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1713 NDFREE(&nd, NDF_ONLY_PNBUF); 1714 if (nd.ni_vp == nd.ni_dvp) 1715 vrele(nd.ni_dvp); 1716 else 1717 vput(nd.ni_dvp); 1718 if (nd.ni_vp) 1719 vrele(nd.ni_vp); 1720 return (EEXIST); 1721 } 1722 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1723 NDFREE(&nd, NDF_ONLY_PNBUF); 1724 vput(nd.ni_dvp); 1725 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1726 return (error); 1727 goto restart; 1728 } 1729 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1730 NDFREE(&nd, NDF_ONLY_PNBUF); 1731 vput(nd.ni_dvp); 1732 vn_finished_write(mp); 1733 return (error); 1734 } 1735 1736 /* 1737 * Delete a name from the filesystem. 1738 */ 1739 #ifndef _SYS_SYSPROTO_H_ 1740 struct unlink_args { 1741 char *path; 1742 }; 1743 #endif 1744 int 1745 sys_unlink(struct thread *td, struct unlink_args *uap) 1746 { 1747 1748 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 1749 0, 0)); 1750 } 1751 1752 static int 1753 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd, 1754 int flag, enum uio_seg pathseg, ino_t oldinum) 1755 { 1756 1757 if ((flag & ~AT_REMOVEDIR) != 0) 1758 return (EINVAL); 1759 1760 if ((flag & AT_REMOVEDIR) != 0) 1761 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0)); 1762 1763 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0)); 1764 } 1765 1766 #ifndef _SYS_SYSPROTO_H_ 1767 struct unlinkat_args { 1768 int fd; 1769 char *path; 1770 int flag; 1771 }; 1772 #endif 1773 int 1774 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1775 { 1776 1777 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag, 1778 UIO_USERSPACE, 0)); 1779 } 1780 1781 #ifndef _SYS_SYSPROTO_H_ 1782 struct funlinkat_args { 1783 int dfd; 1784 const char *path; 1785 int fd; 1786 int flag; 1787 }; 1788 #endif 1789 int 1790 sys_funlinkat(struct thread *td, struct funlinkat_args *uap) 1791 { 1792 1793 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag, 1794 UIO_USERSPACE, 0)); 1795 } 1796 1797 int 1798 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd, 1799 enum uio_seg pathseg, int flag, ino_t oldinum) 1800 { 1801 struct mount *mp; 1802 struct file *fp; 1803 struct vnode *vp; 1804 struct nameidata nd; 1805 struct stat sb; 1806 int error; 1807 1808 fp = NULL; 1809 if (fd != FD_NONE) { 1810 error = getvnode(td, fd, &cap_no_rights, &fp); 1811 if (error != 0) 1812 return (error); 1813 } 1814 1815 restart: 1816 bwillwrite(); 1817 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1818 ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 1819 pathseg, path, dfd, &cap_unlinkat_rights, td); 1820 if ((error = namei(&nd)) != 0) { 1821 if (error == EINVAL) 1822 error = EPERM; 1823 goto fdout; 1824 } 1825 vp = nd.ni_vp; 1826 if (vp->v_type == VDIR && oldinum == 0) { 1827 error = EPERM; /* POSIX */ 1828 } else if (oldinum != 0 && 1829 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1830 sb.st_ino != oldinum) { 1831 error = EIDRM; /* Identifier removed */ 1832 } else if (fp != NULL && fp->f_vnode != vp) { 1833 if (VN_IS_DOOMED(fp->f_vnode)) 1834 error = EBADF; 1835 else 1836 error = EDEADLK; 1837 } else { 1838 /* 1839 * The root of a mounted filesystem cannot be deleted. 1840 * 1841 * XXX: can this only be a VDIR case? 1842 */ 1843 if (vp->v_vflag & VV_ROOT) 1844 error = EBUSY; 1845 } 1846 if (error == 0) { 1847 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1848 NDFREE(&nd, NDF_ONLY_PNBUF); 1849 vput(nd.ni_dvp); 1850 if (vp == nd.ni_dvp) 1851 vrele(vp); 1852 else 1853 vput(vp); 1854 if ((error = vn_start_write(NULL, &mp, 1855 V_XSLEEP | PCATCH)) != 0) { 1856 goto fdout; 1857 } 1858 goto restart; 1859 } 1860 #ifdef MAC 1861 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1862 &nd.ni_cnd); 1863 if (error != 0) 1864 goto out; 1865 #endif 1866 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1867 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1868 #ifdef MAC 1869 out: 1870 #endif 1871 vn_finished_write(mp); 1872 } 1873 NDFREE(&nd, NDF_ONLY_PNBUF); 1874 vput(nd.ni_dvp); 1875 if (vp == nd.ni_dvp) 1876 vrele(vp); 1877 else 1878 vput(vp); 1879 fdout: 1880 if (fp != NULL) 1881 fdrop(fp, td); 1882 return (error); 1883 } 1884 1885 /* 1886 * Reposition read/write file offset. 1887 */ 1888 #ifndef _SYS_SYSPROTO_H_ 1889 struct lseek_args { 1890 int fd; 1891 int pad; 1892 off_t offset; 1893 int whence; 1894 }; 1895 #endif 1896 int 1897 sys_lseek(struct thread *td, struct lseek_args *uap) 1898 { 1899 1900 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1901 } 1902 1903 int 1904 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1905 { 1906 struct file *fp; 1907 int error; 1908 1909 AUDIT_ARG_FD(fd); 1910 error = fget(td, fd, &cap_seek_rights, &fp); 1911 if (error != 0) 1912 return (error); 1913 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1914 fo_seek(fp, offset, whence, td) : ESPIPE; 1915 fdrop(fp, td); 1916 return (error); 1917 } 1918 1919 #if defined(COMPAT_43) 1920 /* 1921 * Reposition read/write file offset. 1922 */ 1923 #ifndef _SYS_SYSPROTO_H_ 1924 struct olseek_args { 1925 int fd; 1926 long offset; 1927 int whence; 1928 }; 1929 #endif 1930 int 1931 olseek(struct thread *td, struct olseek_args *uap) 1932 { 1933 1934 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1935 } 1936 #endif /* COMPAT_43 */ 1937 1938 #if defined(COMPAT_FREEBSD6) 1939 /* Version with the 'pad' argument */ 1940 int 1941 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 1942 { 1943 1944 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1945 } 1946 #endif 1947 1948 /* 1949 * Check access permissions using passed credentials. 1950 */ 1951 static int 1952 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 1953 struct thread *td) 1954 { 1955 accmode_t accmode; 1956 int error; 1957 1958 /* Flags == 0 means only check for existence. */ 1959 if (user_flags == 0) 1960 return (0); 1961 1962 accmode = 0; 1963 if (user_flags & R_OK) 1964 accmode |= VREAD; 1965 if (user_flags & W_OK) 1966 accmode |= VWRITE; 1967 if (user_flags & X_OK) 1968 accmode |= VEXEC; 1969 #ifdef MAC 1970 error = mac_vnode_check_access(cred, vp, accmode); 1971 if (error != 0) 1972 return (error); 1973 #endif 1974 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1975 error = VOP_ACCESS(vp, accmode, cred, td); 1976 return (error); 1977 } 1978 1979 /* 1980 * Check access permissions using "real" credentials. 1981 */ 1982 #ifndef _SYS_SYSPROTO_H_ 1983 struct access_args { 1984 char *path; 1985 int amode; 1986 }; 1987 #endif 1988 int 1989 sys_access(struct thread *td, struct access_args *uap) 1990 { 1991 1992 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1993 0, uap->amode)); 1994 } 1995 1996 #ifndef _SYS_SYSPROTO_H_ 1997 struct faccessat_args { 1998 int dirfd; 1999 char *path; 2000 int amode; 2001 int flag; 2002 } 2003 #endif 2004 int 2005 sys_faccessat(struct thread *td, struct faccessat_args *uap) 2006 { 2007 2008 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 2009 uap->amode)); 2010 } 2011 2012 int 2013 kern_accessat(struct thread *td, int fd, const char *path, 2014 enum uio_seg pathseg, int flag, int amode) 2015 { 2016 struct ucred *cred, *usecred; 2017 struct vnode *vp; 2018 struct nameidata nd; 2019 int error; 2020 2021 if ((flag & ~(AT_EACCESS | AT_BENEATH)) != 0) 2022 return (EINVAL); 2023 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2024 return (EINVAL); 2025 2026 /* 2027 * Create and modify a temporary credential instead of one that 2028 * is potentially shared (if we need one). 2029 */ 2030 cred = td->td_ucred; 2031 if ((flag & AT_EACCESS) == 0 && 2032 ((cred->cr_uid != cred->cr_ruid || 2033 cred->cr_rgid != cred->cr_groups[0]))) { 2034 usecred = crdup(cred); 2035 usecred->cr_uid = cred->cr_ruid; 2036 usecred->cr_groups[0] = cred->cr_rgid; 2037 td->td_ucred = usecred; 2038 } else 2039 usecred = cred; 2040 AUDIT_ARG_VALUE(amode); 2041 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2042 AUDITVNODE1 | ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 2043 pathseg, path, fd, &cap_fstat_rights, td); 2044 if ((error = namei(&nd)) != 0) 2045 goto out; 2046 vp = nd.ni_vp; 2047 2048 error = vn_access(vp, amode, usecred, td); 2049 NDFREE(&nd, NDF_ONLY_PNBUF); 2050 vput(vp); 2051 out: 2052 if (usecred != cred) { 2053 td->td_ucred = cred; 2054 crfree(usecred); 2055 } 2056 return (error); 2057 } 2058 2059 /* 2060 * Check access permissions using "effective" credentials. 2061 */ 2062 #ifndef _SYS_SYSPROTO_H_ 2063 struct eaccess_args { 2064 char *path; 2065 int amode; 2066 }; 2067 #endif 2068 int 2069 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2070 { 2071 2072 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2073 AT_EACCESS, uap->amode)); 2074 } 2075 2076 #if defined(COMPAT_43) 2077 /* 2078 * Get file status; this version follows links. 2079 */ 2080 #ifndef _SYS_SYSPROTO_H_ 2081 struct ostat_args { 2082 char *path; 2083 struct ostat *ub; 2084 }; 2085 #endif 2086 int 2087 ostat(struct thread *td, struct ostat_args *uap) 2088 { 2089 struct stat sb; 2090 struct ostat osb; 2091 int error; 2092 2093 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2094 &sb, NULL); 2095 if (error != 0) 2096 return (error); 2097 cvtstat(&sb, &osb); 2098 return (copyout(&osb, uap->ub, sizeof (osb))); 2099 } 2100 2101 /* 2102 * Get file status; this version does not follow links. 2103 */ 2104 #ifndef _SYS_SYSPROTO_H_ 2105 struct olstat_args { 2106 char *path; 2107 struct ostat *ub; 2108 }; 2109 #endif 2110 int 2111 olstat(struct thread *td, struct olstat_args *uap) 2112 { 2113 struct stat sb; 2114 struct ostat osb; 2115 int error; 2116 2117 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2118 UIO_USERSPACE, &sb, NULL); 2119 if (error != 0) 2120 return (error); 2121 cvtstat(&sb, &osb); 2122 return (copyout(&osb, uap->ub, sizeof (osb))); 2123 } 2124 2125 /* 2126 * Convert from an old to a new stat structure. 2127 * XXX: many values are blindly truncated. 2128 */ 2129 void 2130 cvtstat(struct stat *st, struct ostat *ost) 2131 { 2132 2133 bzero(ost, sizeof(*ost)); 2134 ost->st_dev = st->st_dev; 2135 ost->st_ino = st->st_ino; 2136 ost->st_mode = st->st_mode; 2137 ost->st_nlink = st->st_nlink; 2138 ost->st_uid = st->st_uid; 2139 ost->st_gid = st->st_gid; 2140 ost->st_rdev = st->st_rdev; 2141 ost->st_size = MIN(st->st_size, INT32_MAX); 2142 ost->st_atim = st->st_atim; 2143 ost->st_mtim = st->st_mtim; 2144 ost->st_ctim = st->st_ctim; 2145 ost->st_blksize = st->st_blksize; 2146 ost->st_blocks = st->st_blocks; 2147 ost->st_flags = st->st_flags; 2148 ost->st_gen = st->st_gen; 2149 } 2150 #endif /* COMPAT_43 */ 2151 2152 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2153 int ino64_trunc_error; 2154 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2155 &ino64_trunc_error, 0, 2156 "Error on truncation of device, file or inode number, or link count"); 2157 2158 int 2159 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2160 { 2161 2162 ost->st_dev = st->st_dev; 2163 if (ost->st_dev != st->st_dev) { 2164 switch (ino64_trunc_error) { 2165 default: 2166 /* 2167 * Since dev_t is almost raw, don't clamp to the 2168 * maximum for case 2, but ignore the error. 2169 */ 2170 break; 2171 case 1: 2172 return (EOVERFLOW); 2173 } 2174 } 2175 ost->st_ino = st->st_ino; 2176 if (ost->st_ino != st->st_ino) { 2177 switch (ino64_trunc_error) { 2178 default: 2179 case 0: 2180 break; 2181 case 1: 2182 return (EOVERFLOW); 2183 case 2: 2184 ost->st_ino = UINT32_MAX; 2185 break; 2186 } 2187 } 2188 ost->st_mode = st->st_mode; 2189 ost->st_nlink = st->st_nlink; 2190 if (ost->st_nlink != st->st_nlink) { 2191 switch (ino64_trunc_error) { 2192 default: 2193 case 0: 2194 break; 2195 case 1: 2196 return (EOVERFLOW); 2197 case 2: 2198 ost->st_nlink = UINT16_MAX; 2199 break; 2200 } 2201 } 2202 ost->st_uid = st->st_uid; 2203 ost->st_gid = st->st_gid; 2204 ost->st_rdev = st->st_rdev; 2205 if (ost->st_rdev != st->st_rdev) { 2206 switch (ino64_trunc_error) { 2207 default: 2208 break; 2209 case 1: 2210 return (EOVERFLOW); 2211 } 2212 } 2213 ost->st_atim = st->st_atim; 2214 ost->st_mtim = st->st_mtim; 2215 ost->st_ctim = st->st_ctim; 2216 ost->st_size = st->st_size; 2217 ost->st_blocks = st->st_blocks; 2218 ost->st_blksize = st->st_blksize; 2219 ost->st_flags = st->st_flags; 2220 ost->st_gen = st->st_gen; 2221 ost->st_lspare = 0; 2222 ost->st_birthtim = st->st_birthtim; 2223 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2224 sizeof(*ost) - offsetof(struct freebsd11_stat, 2225 st_birthtim) - sizeof(ost->st_birthtim)); 2226 return (0); 2227 } 2228 2229 int 2230 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2231 { 2232 struct stat sb; 2233 struct freebsd11_stat osb; 2234 int error; 2235 2236 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2237 &sb, NULL); 2238 if (error != 0) 2239 return (error); 2240 error = freebsd11_cvtstat(&sb, &osb); 2241 if (error == 0) 2242 error = copyout(&osb, uap->ub, sizeof(osb)); 2243 return (error); 2244 } 2245 2246 int 2247 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2248 { 2249 struct stat sb; 2250 struct freebsd11_stat osb; 2251 int error; 2252 2253 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2254 UIO_USERSPACE, &sb, NULL); 2255 if (error != 0) 2256 return (error); 2257 error = freebsd11_cvtstat(&sb, &osb); 2258 if (error == 0) 2259 error = copyout(&osb, uap->ub, sizeof(osb)); 2260 return (error); 2261 } 2262 2263 int 2264 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2265 { 2266 struct fhandle fh; 2267 struct stat sb; 2268 struct freebsd11_stat osb; 2269 int error; 2270 2271 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2272 if (error != 0) 2273 return (error); 2274 error = kern_fhstat(td, fh, &sb); 2275 if (error != 0) 2276 return (error); 2277 error = freebsd11_cvtstat(&sb, &osb); 2278 if (error == 0) 2279 error = copyout(&osb, uap->sb, sizeof(osb)); 2280 return (error); 2281 } 2282 2283 int 2284 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2285 { 2286 struct stat sb; 2287 struct freebsd11_stat osb; 2288 int error; 2289 2290 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2291 UIO_USERSPACE, &sb, NULL); 2292 if (error != 0) 2293 return (error); 2294 error = freebsd11_cvtstat(&sb, &osb); 2295 if (error == 0) 2296 error = copyout(&osb, uap->buf, sizeof(osb)); 2297 return (error); 2298 } 2299 #endif /* COMPAT_FREEBSD11 */ 2300 2301 /* 2302 * Get file status 2303 */ 2304 #ifndef _SYS_SYSPROTO_H_ 2305 struct fstatat_args { 2306 int fd; 2307 char *path; 2308 struct stat *buf; 2309 int flag; 2310 } 2311 #endif 2312 int 2313 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2314 { 2315 struct stat sb; 2316 int error; 2317 2318 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2319 UIO_USERSPACE, &sb, NULL); 2320 if (error == 0) 2321 error = copyout(&sb, uap->buf, sizeof (sb)); 2322 return (error); 2323 } 2324 2325 int 2326 kern_statat(struct thread *td, int flag, int fd, const char *path, 2327 enum uio_seg pathseg, struct stat *sbp, 2328 void (*hook)(struct vnode *vp, struct stat *sbp)) 2329 { 2330 struct nameidata nd; 2331 int error; 2332 2333 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2334 return (EINVAL); 2335 2336 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) != 0 ? 2337 NOFOLLOW : FOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0) | 2338 LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd, 2339 &cap_fstat_rights, td); 2340 2341 if ((error = namei(&nd)) != 0) 2342 return (error); 2343 error = vn_stat(nd.ni_vp, sbp, td->td_ucred, NOCRED, td); 2344 if (error == 0) { 2345 SDT_PROBE2(vfs, , stat, mode, path, sbp->st_mode); 2346 if (S_ISREG(sbp->st_mode)) 2347 SDT_PROBE2(vfs, , stat, reg, path, pathseg); 2348 if (__predict_false(hook != NULL)) 2349 hook(nd.ni_vp, sbp); 2350 } 2351 NDFREE(&nd, NDF_ONLY_PNBUF); 2352 vput(nd.ni_vp); 2353 #ifdef __STAT_TIME_T_EXT 2354 sbp->st_atim_ext = 0; 2355 sbp->st_mtim_ext = 0; 2356 sbp->st_ctim_ext = 0; 2357 sbp->st_btim_ext = 0; 2358 #endif 2359 #ifdef KTRACE 2360 if (KTRPOINT(td, KTR_STRUCT)) 2361 ktrstat_error(sbp, error); 2362 #endif 2363 return (error); 2364 } 2365 2366 #if defined(COMPAT_FREEBSD11) 2367 /* 2368 * Implementation of the NetBSD [l]stat() functions. 2369 */ 2370 void 2371 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2372 { 2373 2374 bzero(nsb, sizeof(*nsb)); 2375 nsb->st_dev = sb->st_dev; 2376 nsb->st_ino = sb->st_ino; 2377 nsb->st_mode = sb->st_mode; 2378 nsb->st_nlink = sb->st_nlink; 2379 nsb->st_uid = sb->st_uid; 2380 nsb->st_gid = sb->st_gid; 2381 nsb->st_rdev = sb->st_rdev; 2382 nsb->st_atim = sb->st_atim; 2383 nsb->st_mtim = sb->st_mtim; 2384 nsb->st_ctim = sb->st_ctim; 2385 nsb->st_size = sb->st_size; 2386 nsb->st_blocks = sb->st_blocks; 2387 nsb->st_blksize = sb->st_blksize; 2388 nsb->st_flags = sb->st_flags; 2389 nsb->st_gen = sb->st_gen; 2390 nsb->st_birthtim = sb->st_birthtim; 2391 } 2392 2393 #ifndef _SYS_SYSPROTO_H_ 2394 struct freebsd11_nstat_args { 2395 char *path; 2396 struct nstat *ub; 2397 }; 2398 #endif 2399 int 2400 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2401 { 2402 struct stat sb; 2403 struct nstat nsb; 2404 int error; 2405 2406 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2407 &sb, NULL); 2408 if (error != 0) 2409 return (error); 2410 freebsd11_cvtnstat(&sb, &nsb); 2411 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2412 } 2413 2414 /* 2415 * NetBSD lstat. Get file status; this version does not follow links. 2416 */ 2417 #ifndef _SYS_SYSPROTO_H_ 2418 struct freebsd11_nlstat_args { 2419 char *path; 2420 struct nstat *ub; 2421 }; 2422 #endif 2423 int 2424 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2425 { 2426 struct stat sb; 2427 struct nstat nsb; 2428 int error; 2429 2430 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2431 UIO_USERSPACE, &sb, NULL); 2432 if (error != 0) 2433 return (error); 2434 freebsd11_cvtnstat(&sb, &nsb); 2435 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2436 } 2437 #endif /* COMPAT_FREEBSD11 */ 2438 2439 /* 2440 * Get configurable pathname variables. 2441 */ 2442 #ifndef _SYS_SYSPROTO_H_ 2443 struct pathconf_args { 2444 char *path; 2445 int name; 2446 }; 2447 #endif 2448 int 2449 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2450 { 2451 long value; 2452 int error; 2453 2454 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2455 &value); 2456 if (error == 0) 2457 td->td_retval[0] = value; 2458 return (error); 2459 } 2460 2461 #ifndef _SYS_SYSPROTO_H_ 2462 struct lpathconf_args { 2463 char *path; 2464 int name; 2465 }; 2466 #endif 2467 int 2468 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2469 { 2470 long value; 2471 int error; 2472 2473 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2474 NOFOLLOW, &value); 2475 if (error == 0) 2476 td->td_retval[0] = value; 2477 return (error); 2478 } 2479 2480 int 2481 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg, 2482 int name, u_long flags, long *valuep) 2483 { 2484 struct nameidata nd; 2485 int error; 2486 2487 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2488 pathseg, path, td); 2489 if ((error = namei(&nd)) != 0) 2490 return (error); 2491 NDFREE(&nd, NDF_ONLY_PNBUF); 2492 2493 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2494 vput(nd.ni_vp); 2495 return (error); 2496 } 2497 2498 /* 2499 * Return target name of a symbolic link. 2500 */ 2501 #ifndef _SYS_SYSPROTO_H_ 2502 struct readlink_args { 2503 char *path; 2504 char *buf; 2505 size_t count; 2506 }; 2507 #endif 2508 int 2509 sys_readlink(struct thread *td, struct readlink_args *uap) 2510 { 2511 2512 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2513 uap->buf, UIO_USERSPACE, uap->count)); 2514 } 2515 #ifndef _SYS_SYSPROTO_H_ 2516 struct readlinkat_args { 2517 int fd; 2518 char *path; 2519 char *buf; 2520 size_t bufsize; 2521 }; 2522 #endif 2523 int 2524 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2525 { 2526 2527 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2528 uap->buf, UIO_USERSPACE, uap->bufsize)); 2529 } 2530 2531 int 2532 kern_readlinkat(struct thread *td, int fd, const char *path, 2533 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) 2534 { 2535 struct vnode *vp; 2536 struct nameidata nd; 2537 int error; 2538 2539 if (count > IOSIZE_MAX) 2540 return (EINVAL); 2541 2542 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2543 pathseg, path, fd, td); 2544 2545 if ((error = namei(&nd)) != 0) 2546 return (error); 2547 NDFREE(&nd, NDF_ONLY_PNBUF); 2548 vp = nd.ni_vp; 2549 2550 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2551 vput(vp); 2552 2553 return (error); 2554 } 2555 2556 /* 2557 * Helper function to readlink from a vnode 2558 */ 2559 static int 2560 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2561 struct thread *td) 2562 { 2563 struct iovec aiov; 2564 struct uio auio; 2565 int error; 2566 2567 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2568 #ifdef MAC 2569 error = mac_vnode_check_readlink(td->td_ucred, vp); 2570 if (error != 0) 2571 return (error); 2572 #endif 2573 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2574 return (EINVAL); 2575 2576 aiov.iov_base = buf; 2577 aiov.iov_len = count; 2578 auio.uio_iov = &aiov; 2579 auio.uio_iovcnt = 1; 2580 auio.uio_offset = 0; 2581 auio.uio_rw = UIO_READ; 2582 auio.uio_segflg = bufseg; 2583 auio.uio_td = td; 2584 auio.uio_resid = count; 2585 error = VOP_READLINK(vp, &auio, td->td_ucred); 2586 td->td_retval[0] = count - auio.uio_resid; 2587 return (error); 2588 } 2589 2590 /* 2591 * Common implementation code for chflags() and fchflags(). 2592 */ 2593 static int 2594 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2595 { 2596 struct mount *mp; 2597 struct vattr vattr; 2598 int error; 2599 2600 /* We can't support the value matching VNOVAL. */ 2601 if (flags == VNOVAL) 2602 return (EOPNOTSUPP); 2603 2604 /* 2605 * Prevent non-root users from setting flags on devices. When 2606 * a device is reused, users can retain ownership of the device 2607 * if they are allowed to set flags and programs assume that 2608 * chown can't fail when done as root. 2609 */ 2610 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2611 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2612 if (error != 0) 2613 return (error); 2614 } 2615 2616 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2617 return (error); 2618 VATTR_NULL(&vattr); 2619 vattr.va_flags = flags; 2620 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2621 #ifdef MAC 2622 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2623 if (error == 0) 2624 #endif 2625 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2626 VOP_UNLOCK(vp); 2627 vn_finished_write(mp); 2628 return (error); 2629 } 2630 2631 /* 2632 * Change flags of a file given a path name. 2633 */ 2634 #ifndef _SYS_SYSPROTO_H_ 2635 struct chflags_args { 2636 const char *path; 2637 u_long flags; 2638 }; 2639 #endif 2640 int 2641 sys_chflags(struct thread *td, struct chflags_args *uap) 2642 { 2643 2644 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2645 uap->flags, 0)); 2646 } 2647 2648 #ifndef _SYS_SYSPROTO_H_ 2649 struct chflagsat_args { 2650 int fd; 2651 const char *path; 2652 u_long flags; 2653 int atflag; 2654 } 2655 #endif 2656 int 2657 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2658 { 2659 2660 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2661 return (EINVAL); 2662 2663 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2664 uap->flags, uap->atflag)); 2665 } 2666 2667 /* 2668 * Same as chflags() but doesn't follow symlinks. 2669 */ 2670 #ifndef _SYS_SYSPROTO_H_ 2671 struct lchflags_args { 2672 const char *path; 2673 u_long flags; 2674 }; 2675 #endif 2676 int 2677 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2678 { 2679 2680 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2681 uap->flags, AT_SYMLINK_NOFOLLOW)); 2682 } 2683 2684 static int 2685 kern_chflagsat(struct thread *td, int fd, const char *path, 2686 enum uio_seg pathseg, u_long flags, int atflag) 2687 { 2688 struct nameidata nd; 2689 int error, follow; 2690 2691 AUDIT_ARG_FFLAGS(flags); 2692 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2693 follow |= (atflag & AT_BENEATH) != 0 ? BENEATH : 0; 2694 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2695 &cap_fchflags_rights, td); 2696 if ((error = namei(&nd)) != 0) 2697 return (error); 2698 NDFREE(&nd, NDF_ONLY_PNBUF); 2699 error = setfflags(td, nd.ni_vp, flags); 2700 vrele(nd.ni_vp); 2701 return (error); 2702 } 2703 2704 /* 2705 * Change flags of a file given a file descriptor. 2706 */ 2707 #ifndef _SYS_SYSPROTO_H_ 2708 struct fchflags_args { 2709 int fd; 2710 u_long flags; 2711 }; 2712 #endif 2713 int 2714 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2715 { 2716 struct file *fp; 2717 int error; 2718 2719 AUDIT_ARG_FD(uap->fd); 2720 AUDIT_ARG_FFLAGS(uap->flags); 2721 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2722 &fp); 2723 if (error != 0) 2724 return (error); 2725 #ifdef AUDIT 2726 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2727 AUDIT_ARG_VNODE1(fp->f_vnode); 2728 VOP_UNLOCK(fp->f_vnode); 2729 #endif 2730 error = setfflags(td, fp->f_vnode, uap->flags); 2731 fdrop(fp, td); 2732 return (error); 2733 } 2734 2735 /* 2736 * Common implementation code for chmod(), lchmod() and fchmod(). 2737 */ 2738 int 2739 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2740 { 2741 struct mount *mp; 2742 struct vattr vattr; 2743 int error; 2744 2745 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2746 return (error); 2747 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2748 VATTR_NULL(&vattr); 2749 vattr.va_mode = mode & ALLPERMS; 2750 #ifdef MAC 2751 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2752 if (error == 0) 2753 #endif 2754 error = VOP_SETATTR(vp, &vattr, cred); 2755 VOP_UNLOCK(vp); 2756 vn_finished_write(mp); 2757 return (error); 2758 } 2759 2760 /* 2761 * Change mode of a file given path name. 2762 */ 2763 #ifndef _SYS_SYSPROTO_H_ 2764 struct chmod_args { 2765 char *path; 2766 int mode; 2767 }; 2768 #endif 2769 int 2770 sys_chmod(struct thread *td, struct chmod_args *uap) 2771 { 2772 2773 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2774 uap->mode, 0)); 2775 } 2776 2777 #ifndef _SYS_SYSPROTO_H_ 2778 struct fchmodat_args { 2779 int dirfd; 2780 char *path; 2781 mode_t mode; 2782 int flag; 2783 } 2784 #endif 2785 int 2786 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2787 { 2788 2789 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2790 return (EINVAL); 2791 2792 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2793 uap->mode, uap->flag)); 2794 } 2795 2796 /* 2797 * Change mode of a file given path name (don't follow links.) 2798 */ 2799 #ifndef _SYS_SYSPROTO_H_ 2800 struct lchmod_args { 2801 char *path; 2802 int mode; 2803 }; 2804 #endif 2805 int 2806 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2807 { 2808 2809 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2810 uap->mode, AT_SYMLINK_NOFOLLOW)); 2811 } 2812 2813 int 2814 kern_fchmodat(struct thread *td, int fd, const char *path, 2815 enum uio_seg pathseg, mode_t mode, int flag) 2816 { 2817 struct nameidata nd; 2818 int error, follow; 2819 2820 AUDIT_ARG_MODE(mode); 2821 follow = (flag & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : FOLLOW; 2822 follow |= (flag & AT_BENEATH) != 0 ? BENEATH : 0; 2823 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2824 &cap_fchmod_rights, td); 2825 if ((error = namei(&nd)) != 0) 2826 return (error); 2827 NDFREE(&nd, NDF_ONLY_PNBUF); 2828 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2829 vrele(nd.ni_vp); 2830 return (error); 2831 } 2832 2833 /* 2834 * Change mode of a file given a file descriptor. 2835 */ 2836 #ifndef _SYS_SYSPROTO_H_ 2837 struct fchmod_args { 2838 int fd; 2839 int mode; 2840 }; 2841 #endif 2842 int 2843 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2844 { 2845 struct file *fp; 2846 int error; 2847 2848 AUDIT_ARG_FD(uap->fd); 2849 AUDIT_ARG_MODE(uap->mode); 2850 2851 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2852 if (error != 0) 2853 return (error); 2854 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2855 fdrop(fp, td); 2856 return (error); 2857 } 2858 2859 /* 2860 * Common implementation for chown(), lchown(), and fchown() 2861 */ 2862 int 2863 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2864 gid_t gid) 2865 { 2866 struct mount *mp; 2867 struct vattr vattr; 2868 int error; 2869 2870 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2871 return (error); 2872 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2873 VATTR_NULL(&vattr); 2874 vattr.va_uid = uid; 2875 vattr.va_gid = gid; 2876 #ifdef MAC 2877 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2878 vattr.va_gid); 2879 if (error == 0) 2880 #endif 2881 error = VOP_SETATTR(vp, &vattr, cred); 2882 VOP_UNLOCK(vp); 2883 vn_finished_write(mp); 2884 return (error); 2885 } 2886 2887 /* 2888 * Set ownership given a path name. 2889 */ 2890 #ifndef _SYS_SYSPROTO_H_ 2891 struct chown_args { 2892 char *path; 2893 int uid; 2894 int gid; 2895 }; 2896 #endif 2897 int 2898 sys_chown(struct thread *td, struct chown_args *uap) 2899 { 2900 2901 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2902 uap->gid, 0)); 2903 } 2904 2905 #ifndef _SYS_SYSPROTO_H_ 2906 struct fchownat_args { 2907 int fd; 2908 const char * path; 2909 uid_t uid; 2910 gid_t gid; 2911 int flag; 2912 }; 2913 #endif 2914 int 2915 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2916 { 2917 2918 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 2919 return (EINVAL); 2920 2921 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 2922 uap->gid, uap->flag)); 2923 } 2924 2925 int 2926 kern_fchownat(struct thread *td, int fd, const char *path, 2927 enum uio_seg pathseg, int uid, int gid, int flag) 2928 { 2929 struct nameidata nd; 2930 int error, follow; 2931 2932 AUDIT_ARG_OWNER(uid, gid); 2933 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2934 follow |= (flag & AT_BENEATH) != 0 ? BENEATH : 0; 2935 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2936 &cap_fchown_rights, td); 2937 2938 if ((error = namei(&nd)) != 0) 2939 return (error); 2940 NDFREE(&nd, NDF_ONLY_PNBUF); 2941 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 2942 vrele(nd.ni_vp); 2943 return (error); 2944 } 2945 2946 /* 2947 * Set ownership given a path name, do not cross symlinks. 2948 */ 2949 #ifndef _SYS_SYSPROTO_H_ 2950 struct lchown_args { 2951 char *path; 2952 int uid; 2953 int gid; 2954 }; 2955 #endif 2956 int 2957 sys_lchown(struct thread *td, struct lchown_args *uap) 2958 { 2959 2960 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2961 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 2962 } 2963 2964 /* 2965 * Set ownership given a file descriptor. 2966 */ 2967 #ifndef _SYS_SYSPROTO_H_ 2968 struct fchown_args { 2969 int fd; 2970 int uid; 2971 int gid; 2972 }; 2973 #endif 2974 int 2975 sys_fchown(struct thread *td, struct fchown_args *uap) 2976 { 2977 struct file *fp; 2978 int error; 2979 2980 AUDIT_ARG_FD(uap->fd); 2981 AUDIT_ARG_OWNER(uap->uid, uap->gid); 2982 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 2983 if (error != 0) 2984 return (error); 2985 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 2986 fdrop(fp, td); 2987 return (error); 2988 } 2989 2990 /* 2991 * Common implementation code for utimes(), lutimes(), and futimes(). 2992 */ 2993 static int 2994 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 2995 struct timespec *tsp) 2996 { 2997 struct timeval tv[2]; 2998 const struct timeval *tvp; 2999 int error; 3000 3001 if (usrtvp == NULL) { 3002 vfs_timestamp(&tsp[0]); 3003 tsp[1] = tsp[0]; 3004 } else { 3005 if (tvpseg == UIO_SYSSPACE) { 3006 tvp = usrtvp; 3007 } else { 3008 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 3009 return (error); 3010 tvp = tv; 3011 } 3012 3013 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3014 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3015 return (EINVAL); 3016 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3017 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3018 } 3019 return (0); 3020 } 3021 3022 /* 3023 * Common implementation code for futimens(), utimensat(). 3024 */ 3025 #define UTIMENS_NULL 0x1 3026 #define UTIMENS_EXIT 0x2 3027 static int 3028 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3029 struct timespec *tsp, int *retflags) 3030 { 3031 struct timespec tsnow; 3032 int error; 3033 3034 vfs_timestamp(&tsnow); 3035 *retflags = 0; 3036 if (usrtsp == NULL) { 3037 tsp[0] = tsnow; 3038 tsp[1] = tsnow; 3039 *retflags |= UTIMENS_NULL; 3040 return (0); 3041 } 3042 if (tspseg == UIO_SYSSPACE) { 3043 tsp[0] = usrtsp[0]; 3044 tsp[1] = usrtsp[1]; 3045 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3046 return (error); 3047 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3048 *retflags |= UTIMENS_EXIT; 3049 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3050 *retflags |= UTIMENS_NULL; 3051 if (tsp[0].tv_nsec == UTIME_OMIT) 3052 tsp[0].tv_sec = VNOVAL; 3053 else if (tsp[0].tv_nsec == UTIME_NOW) 3054 tsp[0] = tsnow; 3055 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3056 return (EINVAL); 3057 if (tsp[1].tv_nsec == UTIME_OMIT) 3058 tsp[1].tv_sec = VNOVAL; 3059 else if (tsp[1].tv_nsec == UTIME_NOW) 3060 tsp[1] = tsnow; 3061 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3062 return (EINVAL); 3063 3064 return (0); 3065 } 3066 3067 /* 3068 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3069 * and utimensat(). 3070 */ 3071 static int 3072 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3073 int numtimes, int nullflag) 3074 { 3075 struct mount *mp; 3076 struct vattr vattr; 3077 int error, setbirthtime; 3078 3079 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3080 return (error); 3081 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3082 setbirthtime = 0; 3083 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3084 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3085 setbirthtime = 1; 3086 VATTR_NULL(&vattr); 3087 vattr.va_atime = ts[0]; 3088 vattr.va_mtime = ts[1]; 3089 if (setbirthtime) 3090 vattr.va_birthtime = ts[1]; 3091 if (numtimes > 2) 3092 vattr.va_birthtime = ts[2]; 3093 if (nullflag) 3094 vattr.va_vaflags |= VA_UTIMES_NULL; 3095 #ifdef MAC 3096 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3097 vattr.va_mtime); 3098 #endif 3099 if (error == 0) 3100 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3101 VOP_UNLOCK(vp); 3102 vn_finished_write(mp); 3103 return (error); 3104 } 3105 3106 /* 3107 * Set the access and modification times of a file. 3108 */ 3109 #ifndef _SYS_SYSPROTO_H_ 3110 struct utimes_args { 3111 char *path; 3112 struct timeval *tptr; 3113 }; 3114 #endif 3115 int 3116 sys_utimes(struct thread *td, struct utimes_args *uap) 3117 { 3118 3119 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3120 uap->tptr, UIO_USERSPACE)); 3121 } 3122 3123 #ifndef _SYS_SYSPROTO_H_ 3124 struct futimesat_args { 3125 int fd; 3126 const char * path; 3127 const struct timeval * times; 3128 }; 3129 #endif 3130 int 3131 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3132 { 3133 3134 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3135 uap->times, UIO_USERSPACE)); 3136 } 3137 3138 int 3139 kern_utimesat(struct thread *td, int fd, const char *path, 3140 enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) 3141 { 3142 struct nameidata nd; 3143 struct timespec ts[2]; 3144 int error; 3145 3146 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3147 return (error); 3148 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3149 &cap_futimes_rights, td); 3150 3151 if ((error = namei(&nd)) != 0) 3152 return (error); 3153 NDFREE(&nd, NDF_ONLY_PNBUF); 3154 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3155 vrele(nd.ni_vp); 3156 return (error); 3157 } 3158 3159 /* 3160 * Set the access and modification times of a file. 3161 */ 3162 #ifndef _SYS_SYSPROTO_H_ 3163 struct lutimes_args { 3164 char *path; 3165 struct timeval *tptr; 3166 }; 3167 #endif 3168 int 3169 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3170 { 3171 3172 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3173 UIO_USERSPACE)); 3174 } 3175 3176 int 3177 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg, 3178 struct timeval *tptr, enum uio_seg tptrseg) 3179 { 3180 struct timespec ts[2]; 3181 struct nameidata nd; 3182 int error; 3183 3184 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3185 return (error); 3186 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3187 if ((error = namei(&nd)) != 0) 3188 return (error); 3189 NDFREE(&nd, NDF_ONLY_PNBUF); 3190 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3191 vrele(nd.ni_vp); 3192 return (error); 3193 } 3194 3195 /* 3196 * Set the access and modification times of a file. 3197 */ 3198 #ifndef _SYS_SYSPROTO_H_ 3199 struct futimes_args { 3200 int fd; 3201 struct timeval *tptr; 3202 }; 3203 #endif 3204 int 3205 sys_futimes(struct thread *td, struct futimes_args *uap) 3206 { 3207 3208 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3209 } 3210 3211 int 3212 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3213 enum uio_seg tptrseg) 3214 { 3215 struct timespec ts[2]; 3216 struct file *fp; 3217 int error; 3218 3219 AUDIT_ARG_FD(fd); 3220 error = getutimes(tptr, tptrseg, ts); 3221 if (error != 0) 3222 return (error); 3223 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3224 if (error != 0) 3225 return (error); 3226 #ifdef AUDIT 3227 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3228 AUDIT_ARG_VNODE1(fp->f_vnode); 3229 VOP_UNLOCK(fp->f_vnode); 3230 #endif 3231 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3232 fdrop(fp, td); 3233 return (error); 3234 } 3235 3236 int 3237 sys_futimens(struct thread *td, struct futimens_args *uap) 3238 { 3239 3240 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3241 } 3242 3243 int 3244 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3245 enum uio_seg tptrseg) 3246 { 3247 struct timespec ts[2]; 3248 struct file *fp; 3249 int error, flags; 3250 3251 AUDIT_ARG_FD(fd); 3252 error = getutimens(tptr, tptrseg, ts, &flags); 3253 if (error != 0) 3254 return (error); 3255 if (flags & UTIMENS_EXIT) 3256 return (0); 3257 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3258 if (error != 0) 3259 return (error); 3260 #ifdef AUDIT 3261 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3262 AUDIT_ARG_VNODE1(fp->f_vnode); 3263 VOP_UNLOCK(fp->f_vnode); 3264 #endif 3265 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3266 fdrop(fp, td); 3267 return (error); 3268 } 3269 3270 int 3271 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3272 { 3273 3274 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3275 uap->times, UIO_USERSPACE, uap->flag)); 3276 } 3277 3278 int 3279 kern_utimensat(struct thread *td, int fd, const char *path, 3280 enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg, 3281 int flag) 3282 { 3283 struct nameidata nd; 3284 struct timespec ts[2]; 3285 int error, flags; 3286 3287 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 3288 return (EINVAL); 3289 3290 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3291 return (error); 3292 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 3293 FOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0) | AUDITVNODE1, 3294 pathseg, path, fd, &cap_futimes_rights, td); 3295 if ((error = namei(&nd)) != 0) 3296 return (error); 3297 /* 3298 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3299 * POSIX states: 3300 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3301 * "Search permission is denied by a component of the path prefix." 3302 */ 3303 NDFREE(&nd, NDF_ONLY_PNBUF); 3304 if ((flags & UTIMENS_EXIT) == 0) 3305 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3306 vrele(nd.ni_vp); 3307 return (error); 3308 } 3309 3310 /* 3311 * Truncate a file given its path name. 3312 */ 3313 #ifndef _SYS_SYSPROTO_H_ 3314 struct truncate_args { 3315 char *path; 3316 int pad; 3317 off_t length; 3318 }; 3319 #endif 3320 int 3321 sys_truncate(struct thread *td, struct truncate_args *uap) 3322 { 3323 3324 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3325 } 3326 3327 int 3328 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg, 3329 off_t length) 3330 { 3331 struct mount *mp; 3332 struct vnode *vp; 3333 void *rl_cookie; 3334 struct vattr vattr; 3335 struct nameidata nd; 3336 int error; 3337 3338 if (length < 0) 3339 return(EINVAL); 3340 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3341 if ((error = namei(&nd)) != 0) 3342 return (error); 3343 vp = nd.ni_vp; 3344 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3345 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3346 vn_rangelock_unlock(vp, rl_cookie); 3347 vrele(vp); 3348 return (error); 3349 } 3350 NDFREE(&nd, NDF_ONLY_PNBUF); 3351 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3352 if (vp->v_type == VDIR) 3353 error = EISDIR; 3354 #ifdef MAC 3355 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3356 } 3357 #endif 3358 else if ((error = vn_writechk(vp)) == 0 && 3359 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3360 VATTR_NULL(&vattr); 3361 vattr.va_size = length; 3362 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3363 } 3364 VOP_UNLOCK(vp); 3365 vn_finished_write(mp); 3366 vn_rangelock_unlock(vp, rl_cookie); 3367 vrele(vp); 3368 return (error); 3369 } 3370 3371 #if defined(COMPAT_43) 3372 /* 3373 * Truncate a file given its path name. 3374 */ 3375 #ifndef _SYS_SYSPROTO_H_ 3376 struct otruncate_args { 3377 char *path; 3378 long length; 3379 }; 3380 #endif 3381 int 3382 otruncate(struct thread *td, struct otruncate_args *uap) 3383 { 3384 3385 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3386 } 3387 #endif /* COMPAT_43 */ 3388 3389 #if defined(COMPAT_FREEBSD6) 3390 /* Versions with the pad argument */ 3391 int 3392 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3393 { 3394 3395 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3396 } 3397 3398 int 3399 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3400 { 3401 3402 return (kern_ftruncate(td, uap->fd, uap->length)); 3403 } 3404 #endif 3405 3406 int 3407 kern_fsync(struct thread *td, int fd, bool fullsync) 3408 { 3409 struct vnode *vp; 3410 struct mount *mp; 3411 struct file *fp; 3412 int error, lock_flags; 3413 3414 AUDIT_ARG_FD(fd); 3415 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3416 if (error != 0) 3417 return (error); 3418 vp = fp->f_vnode; 3419 #if 0 3420 if (!fullsync) 3421 /* XXXKIB: compete outstanding aio writes */; 3422 #endif 3423 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3424 if (error != 0) 3425 goto drop; 3426 if (MNT_SHARED_WRITES(mp) || 3427 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3428 lock_flags = LK_SHARED; 3429 } else { 3430 lock_flags = LK_EXCLUSIVE; 3431 } 3432 vn_lock(vp, lock_flags | LK_RETRY); 3433 AUDIT_ARG_VNODE1(vp); 3434 if (vp->v_object != NULL) { 3435 VM_OBJECT_WLOCK(vp->v_object); 3436 vm_object_page_clean(vp->v_object, 0, 0, 0); 3437 VM_OBJECT_WUNLOCK(vp->v_object); 3438 } 3439 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3440 VOP_UNLOCK(vp); 3441 vn_finished_write(mp); 3442 drop: 3443 fdrop(fp, td); 3444 return (error); 3445 } 3446 3447 /* 3448 * Sync an open file. 3449 */ 3450 #ifndef _SYS_SYSPROTO_H_ 3451 struct fsync_args { 3452 int fd; 3453 }; 3454 #endif 3455 int 3456 sys_fsync(struct thread *td, struct fsync_args *uap) 3457 { 3458 3459 return (kern_fsync(td, uap->fd, true)); 3460 } 3461 3462 int 3463 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3464 { 3465 3466 return (kern_fsync(td, uap->fd, false)); 3467 } 3468 3469 /* 3470 * Rename files. Source and destination must either both be directories, or 3471 * both not be directories. If target is a directory, it must be empty. 3472 */ 3473 #ifndef _SYS_SYSPROTO_H_ 3474 struct rename_args { 3475 char *from; 3476 char *to; 3477 }; 3478 #endif 3479 int 3480 sys_rename(struct thread *td, struct rename_args *uap) 3481 { 3482 3483 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3484 uap->to, UIO_USERSPACE)); 3485 } 3486 3487 #ifndef _SYS_SYSPROTO_H_ 3488 struct renameat_args { 3489 int oldfd; 3490 char *old; 3491 int newfd; 3492 char *new; 3493 }; 3494 #endif 3495 int 3496 sys_renameat(struct thread *td, struct renameat_args *uap) 3497 { 3498 3499 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3500 UIO_USERSPACE)); 3501 } 3502 3503 int 3504 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd, 3505 const char *new, enum uio_seg pathseg) 3506 { 3507 struct mount *mp = NULL; 3508 struct vnode *tvp, *fvp, *tdvp; 3509 struct nameidata fromnd, tond; 3510 int error; 3511 3512 again: 3513 bwillwrite(); 3514 #ifdef MAC 3515 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3516 AUDITVNODE1, pathseg, old, oldfd, 3517 &cap_renameat_source_rights, td); 3518 #else 3519 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3520 pathseg, old, oldfd, 3521 &cap_renameat_source_rights, td); 3522 #endif 3523 3524 if ((error = namei(&fromnd)) != 0) 3525 return (error); 3526 #ifdef MAC 3527 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3528 fromnd.ni_vp, &fromnd.ni_cnd); 3529 VOP_UNLOCK(fromnd.ni_dvp); 3530 if (fromnd.ni_dvp != fromnd.ni_vp) 3531 VOP_UNLOCK(fromnd.ni_vp); 3532 #endif 3533 fvp = fromnd.ni_vp; 3534 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3535 SAVESTART | AUDITVNODE2, pathseg, new, newfd, 3536 &cap_renameat_target_rights, td); 3537 if (fromnd.ni_vp->v_type == VDIR) 3538 tond.ni_cnd.cn_flags |= WILLBEDIR; 3539 if ((error = namei(&tond)) != 0) { 3540 /* Translate error code for rename("dir1", "dir2/."). */ 3541 if (error == EISDIR && fvp->v_type == VDIR) 3542 error = EINVAL; 3543 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3544 vrele(fromnd.ni_dvp); 3545 vrele(fvp); 3546 goto out1; 3547 } 3548 tdvp = tond.ni_dvp; 3549 tvp = tond.ni_vp; 3550 error = vn_start_write(fvp, &mp, V_NOWAIT); 3551 if (error != 0) { 3552 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3553 NDFREE(&tond, NDF_ONLY_PNBUF); 3554 if (tvp != NULL) 3555 vput(tvp); 3556 if (tdvp == tvp) 3557 vrele(tdvp); 3558 else 3559 vput(tdvp); 3560 vrele(fromnd.ni_dvp); 3561 vrele(fvp); 3562 vrele(tond.ni_startdir); 3563 if (fromnd.ni_startdir != NULL) 3564 vrele(fromnd.ni_startdir); 3565 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3566 if (error != 0) 3567 return (error); 3568 goto again; 3569 } 3570 if (tvp != NULL) { 3571 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3572 error = ENOTDIR; 3573 goto out; 3574 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3575 error = EISDIR; 3576 goto out; 3577 } 3578 #ifdef CAPABILITIES 3579 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3580 /* 3581 * If the target already exists we require CAP_UNLINKAT 3582 * from 'newfd', when newfd was used for the lookup. 3583 */ 3584 error = cap_check(&tond.ni_filecaps.fc_rights, 3585 &cap_unlinkat_rights); 3586 if (error != 0) 3587 goto out; 3588 } 3589 #endif 3590 } 3591 if (fvp == tdvp) { 3592 error = EINVAL; 3593 goto out; 3594 } 3595 /* 3596 * If the source is the same as the destination (that is, if they 3597 * are links to the same vnode), then there is nothing to do. 3598 */ 3599 if (fvp == tvp) 3600 error = -1; 3601 #ifdef MAC 3602 else 3603 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3604 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3605 #endif 3606 out: 3607 if (error == 0) { 3608 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3609 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3610 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3611 NDFREE(&tond, NDF_ONLY_PNBUF); 3612 } else { 3613 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3614 NDFREE(&tond, NDF_ONLY_PNBUF); 3615 if (tvp != NULL) 3616 vput(tvp); 3617 if (tdvp == tvp) 3618 vrele(tdvp); 3619 else 3620 vput(tdvp); 3621 vrele(fromnd.ni_dvp); 3622 vrele(fvp); 3623 } 3624 vrele(tond.ni_startdir); 3625 vn_finished_write(mp); 3626 out1: 3627 if (fromnd.ni_startdir) 3628 vrele(fromnd.ni_startdir); 3629 if (error == -1) 3630 return (0); 3631 return (error); 3632 } 3633 3634 /* 3635 * Make a directory file. 3636 */ 3637 #ifndef _SYS_SYSPROTO_H_ 3638 struct mkdir_args { 3639 char *path; 3640 int mode; 3641 }; 3642 #endif 3643 int 3644 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3645 { 3646 3647 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3648 uap->mode)); 3649 } 3650 3651 #ifndef _SYS_SYSPROTO_H_ 3652 struct mkdirat_args { 3653 int fd; 3654 char *path; 3655 mode_t mode; 3656 }; 3657 #endif 3658 int 3659 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3660 { 3661 3662 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3663 } 3664 3665 int 3666 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg, 3667 int mode) 3668 { 3669 struct mount *mp; 3670 struct vnode *vp; 3671 struct vattr vattr; 3672 struct nameidata nd; 3673 int error; 3674 3675 AUDIT_ARG_MODE(mode); 3676 restart: 3677 bwillwrite(); 3678 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3679 NOCACHE, segflg, path, fd, &cap_mkdirat_rights, 3680 td); 3681 nd.ni_cnd.cn_flags |= WILLBEDIR; 3682 if ((error = namei(&nd)) != 0) 3683 return (error); 3684 vp = nd.ni_vp; 3685 if (vp != NULL) { 3686 NDFREE(&nd, NDF_ONLY_PNBUF); 3687 /* 3688 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3689 * the strange behaviour of leaving the vnode unlocked 3690 * if the target is the same vnode as the parent. 3691 */ 3692 if (vp == nd.ni_dvp) 3693 vrele(nd.ni_dvp); 3694 else 3695 vput(nd.ni_dvp); 3696 vrele(vp); 3697 return (EEXIST); 3698 } 3699 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3700 NDFREE(&nd, NDF_ONLY_PNBUF); 3701 vput(nd.ni_dvp); 3702 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3703 return (error); 3704 goto restart; 3705 } 3706 VATTR_NULL(&vattr); 3707 vattr.va_type = VDIR; 3708 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3709 #ifdef MAC 3710 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3711 &vattr); 3712 if (error != 0) 3713 goto out; 3714 #endif 3715 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3716 #ifdef MAC 3717 out: 3718 #endif 3719 NDFREE(&nd, NDF_ONLY_PNBUF); 3720 vput(nd.ni_dvp); 3721 if (error == 0) 3722 vput(nd.ni_vp); 3723 vn_finished_write(mp); 3724 return (error); 3725 } 3726 3727 /* 3728 * Remove a directory file. 3729 */ 3730 #ifndef _SYS_SYSPROTO_H_ 3731 struct rmdir_args { 3732 char *path; 3733 }; 3734 #endif 3735 int 3736 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3737 { 3738 3739 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE, 3740 0)); 3741 } 3742 3743 int 3744 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd, 3745 enum uio_seg pathseg, int flag) 3746 { 3747 struct mount *mp; 3748 struct vnode *vp; 3749 struct file *fp; 3750 struct nameidata nd; 3751 cap_rights_t rights; 3752 int error; 3753 3754 fp = NULL; 3755 if (fd != FD_NONE) { 3756 error = getvnode(td, fd, cap_rights_init_one(&rights, CAP_LOOKUP), 3757 &fp); 3758 if (error != 0) 3759 return (error); 3760 } 3761 3762 restart: 3763 bwillwrite(); 3764 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3765 ((flag & AT_BENEATH) != 0 ? BENEATH : 0), 3766 pathseg, path, dfd, &cap_unlinkat_rights, td); 3767 if ((error = namei(&nd)) != 0) 3768 goto fdout; 3769 vp = nd.ni_vp; 3770 if (vp->v_type != VDIR) { 3771 error = ENOTDIR; 3772 goto out; 3773 } 3774 /* 3775 * No rmdir "." please. 3776 */ 3777 if (nd.ni_dvp == vp) { 3778 error = EINVAL; 3779 goto out; 3780 } 3781 /* 3782 * The root of a mounted filesystem cannot be deleted. 3783 */ 3784 if (vp->v_vflag & VV_ROOT) { 3785 error = EBUSY; 3786 goto out; 3787 } 3788 3789 if (fp != NULL && fp->f_vnode != vp) { 3790 if (VN_IS_DOOMED(fp->f_vnode)) 3791 error = EBADF; 3792 else 3793 error = EDEADLK; 3794 goto out; 3795 } 3796 3797 #ifdef MAC 3798 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3799 &nd.ni_cnd); 3800 if (error != 0) 3801 goto out; 3802 #endif 3803 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3804 NDFREE(&nd, NDF_ONLY_PNBUF); 3805 vput(vp); 3806 if (nd.ni_dvp == vp) 3807 vrele(nd.ni_dvp); 3808 else 3809 vput(nd.ni_dvp); 3810 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3811 goto fdout; 3812 goto restart; 3813 } 3814 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3815 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3816 vn_finished_write(mp); 3817 out: 3818 NDFREE(&nd, NDF_ONLY_PNBUF); 3819 vput(vp); 3820 if (nd.ni_dvp == vp) 3821 vrele(nd.ni_dvp); 3822 else 3823 vput(nd.ni_dvp); 3824 fdout: 3825 if (fp != NULL) 3826 fdrop(fp, td); 3827 return (error); 3828 } 3829 3830 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3831 int 3832 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3833 long *basep, void (*func)(struct freebsd11_dirent *)) 3834 { 3835 struct freebsd11_dirent dstdp; 3836 struct dirent *dp, *edp; 3837 char *dirbuf; 3838 off_t base; 3839 ssize_t resid, ucount; 3840 int error; 3841 3842 /* XXX arbitrary sanity limit on `count'. */ 3843 count = min(count, 64 * 1024); 3844 3845 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3846 3847 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3848 UIO_SYSSPACE); 3849 if (error != 0) 3850 goto done; 3851 if (basep != NULL) 3852 *basep = base; 3853 3854 ucount = 0; 3855 for (dp = (struct dirent *)dirbuf, 3856 edp = (struct dirent *)&dirbuf[count - resid]; 3857 ucount < count && dp < edp; ) { 3858 if (dp->d_reclen == 0) 3859 break; 3860 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3861 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3862 continue; 3863 dstdp.d_type = dp->d_type; 3864 dstdp.d_namlen = dp->d_namlen; 3865 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3866 if (dstdp.d_fileno != dp->d_fileno) { 3867 switch (ino64_trunc_error) { 3868 default: 3869 case 0: 3870 break; 3871 case 1: 3872 error = EOVERFLOW; 3873 goto done; 3874 case 2: 3875 dstdp.d_fileno = UINT32_MAX; 3876 break; 3877 } 3878 } 3879 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3880 ((dp->d_namlen + 1 + 3) &~ 3); 3881 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3882 bzero(dstdp.d_name + dstdp.d_namlen, 3883 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3884 dstdp.d_namlen); 3885 MPASS(dstdp.d_reclen <= dp->d_reclen); 3886 MPASS(ucount + dstdp.d_reclen <= count); 3887 if (func != NULL) 3888 func(&dstdp); 3889 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3890 if (error != 0) 3891 break; 3892 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3893 ucount += dstdp.d_reclen; 3894 } 3895 3896 done: 3897 free(dirbuf, M_TEMP); 3898 if (error == 0) 3899 td->td_retval[0] = ucount; 3900 return (error); 3901 } 3902 #endif /* COMPAT */ 3903 3904 #ifdef COMPAT_43 3905 static void 3906 ogetdirentries_cvt(struct freebsd11_dirent *dp) 3907 { 3908 #if (BYTE_ORDER == LITTLE_ENDIAN) 3909 /* 3910 * The expected low byte of dp->d_namlen is our dp->d_type. 3911 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 3912 */ 3913 dp->d_type = dp->d_namlen; 3914 dp->d_namlen = 0; 3915 #else 3916 /* 3917 * The dp->d_type is the high byte of the expected dp->d_namlen, 3918 * so must be zero'ed. 3919 */ 3920 dp->d_type = 0; 3921 #endif 3922 } 3923 3924 /* 3925 * Read a block of directory entries in a filesystem independent format. 3926 */ 3927 #ifndef _SYS_SYSPROTO_H_ 3928 struct ogetdirentries_args { 3929 int fd; 3930 char *buf; 3931 u_int count; 3932 long *basep; 3933 }; 3934 #endif 3935 int 3936 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3937 { 3938 long loff; 3939 int error; 3940 3941 error = kern_ogetdirentries(td, uap, &loff); 3942 if (error == 0) 3943 error = copyout(&loff, uap->basep, sizeof(long)); 3944 return (error); 3945 } 3946 3947 int 3948 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3949 long *ploff) 3950 { 3951 long base; 3952 int error; 3953 3954 /* XXX arbitrary sanity limit on `count'. */ 3955 if (uap->count > 64 * 1024) 3956 return (EINVAL); 3957 3958 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3959 &base, ogetdirentries_cvt); 3960 3961 if (error == 0 && uap->basep != NULL) 3962 error = copyout(&base, uap->basep, sizeof(long)); 3963 3964 return (error); 3965 } 3966 #endif /* COMPAT_43 */ 3967 3968 #if defined(COMPAT_FREEBSD11) 3969 #ifndef _SYS_SYSPROTO_H_ 3970 struct freebsd11_getdirentries_args { 3971 int fd; 3972 char *buf; 3973 u_int count; 3974 long *basep; 3975 }; 3976 #endif 3977 int 3978 freebsd11_getdirentries(struct thread *td, 3979 struct freebsd11_getdirentries_args *uap) 3980 { 3981 long base; 3982 int error; 3983 3984 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3985 &base, NULL); 3986 3987 if (error == 0 && uap->basep != NULL) 3988 error = copyout(&base, uap->basep, sizeof(long)); 3989 return (error); 3990 } 3991 3992 int 3993 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 3994 { 3995 struct freebsd11_getdirentries_args ap; 3996 3997 ap.fd = uap->fd; 3998 ap.buf = uap->buf; 3999 ap.count = uap->count; 4000 ap.basep = NULL; 4001 return (freebsd11_getdirentries(td, &ap)); 4002 } 4003 #endif /* COMPAT_FREEBSD11 */ 4004 4005 /* 4006 * Read a block of directory entries in a filesystem independent format. 4007 */ 4008 int 4009 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 4010 { 4011 off_t base; 4012 int error; 4013 4014 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 4015 NULL, UIO_USERSPACE); 4016 if (error != 0) 4017 return (error); 4018 if (uap->basep != NULL) 4019 error = copyout(&base, uap->basep, sizeof(off_t)); 4020 return (error); 4021 } 4022 4023 int 4024 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 4025 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 4026 { 4027 struct vnode *vp; 4028 struct file *fp; 4029 struct uio auio; 4030 struct iovec aiov; 4031 off_t loff; 4032 int error, eofflag; 4033 off_t foffset; 4034 4035 AUDIT_ARG_FD(fd); 4036 if (count > IOSIZE_MAX) 4037 return (EINVAL); 4038 auio.uio_resid = count; 4039 error = getvnode(td, fd, &cap_read_rights, &fp); 4040 if (error != 0) 4041 return (error); 4042 if ((fp->f_flag & FREAD) == 0) { 4043 fdrop(fp, td); 4044 return (EBADF); 4045 } 4046 vp = fp->f_vnode; 4047 foffset = foffset_lock(fp, 0); 4048 unionread: 4049 if (vp->v_type != VDIR) { 4050 error = EINVAL; 4051 goto fail; 4052 } 4053 aiov.iov_base = buf; 4054 aiov.iov_len = count; 4055 auio.uio_iov = &aiov; 4056 auio.uio_iovcnt = 1; 4057 auio.uio_rw = UIO_READ; 4058 auio.uio_segflg = bufseg; 4059 auio.uio_td = td; 4060 vn_lock(vp, LK_SHARED | LK_RETRY); 4061 AUDIT_ARG_VNODE1(vp); 4062 loff = auio.uio_offset = foffset; 4063 #ifdef MAC 4064 error = mac_vnode_check_readdir(td->td_ucred, vp); 4065 if (error == 0) 4066 #endif 4067 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4068 NULL); 4069 foffset = auio.uio_offset; 4070 if (error != 0) { 4071 VOP_UNLOCK(vp); 4072 goto fail; 4073 } 4074 if (count == auio.uio_resid && 4075 (vp->v_vflag & VV_ROOT) && 4076 (vp->v_mount->mnt_flag & MNT_UNION)) { 4077 struct vnode *tvp = vp; 4078 4079 vp = vp->v_mount->mnt_vnodecovered; 4080 VREF(vp); 4081 fp->f_vnode = vp; 4082 fp->f_data = vp; 4083 foffset = 0; 4084 vput(tvp); 4085 goto unionread; 4086 } 4087 VOP_UNLOCK(vp); 4088 *basep = loff; 4089 if (residp != NULL) 4090 *residp = auio.uio_resid; 4091 td->td_retval[0] = count - auio.uio_resid; 4092 fail: 4093 foffset_unlock(fp, foffset, 0); 4094 fdrop(fp, td); 4095 return (error); 4096 } 4097 4098 /* 4099 * Set the mode mask for creation of filesystem nodes. 4100 */ 4101 #ifndef _SYS_SYSPROTO_H_ 4102 struct umask_args { 4103 int newmask; 4104 }; 4105 #endif 4106 int 4107 sys_umask(struct thread *td, struct umask_args *uap) 4108 { 4109 struct filedesc *fdp; 4110 4111 fdp = td->td_proc->p_fd; 4112 FILEDESC_XLOCK(fdp); 4113 td->td_retval[0] = fdp->fd_cmask; 4114 fdp->fd_cmask = uap->newmask & ALLPERMS; 4115 FILEDESC_XUNLOCK(fdp); 4116 return (0); 4117 } 4118 4119 /* 4120 * Void all references to file by ripping underlying filesystem away from 4121 * vnode. 4122 */ 4123 #ifndef _SYS_SYSPROTO_H_ 4124 struct revoke_args { 4125 char *path; 4126 }; 4127 #endif 4128 int 4129 sys_revoke(struct thread *td, struct revoke_args *uap) 4130 { 4131 struct vnode *vp; 4132 struct vattr vattr; 4133 struct nameidata nd; 4134 int error; 4135 4136 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4137 uap->path, td); 4138 if ((error = namei(&nd)) != 0) 4139 return (error); 4140 vp = nd.ni_vp; 4141 NDFREE(&nd, NDF_ONLY_PNBUF); 4142 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4143 error = EINVAL; 4144 goto out; 4145 } 4146 #ifdef MAC 4147 error = mac_vnode_check_revoke(td->td_ucred, vp); 4148 if (error != 0) 4149 goto out; 4150 #endif 4151 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4152 if (error != 0) 4153 goto out; 4154 if (td->td_ucred->cr_uid != vattr.va_uid) { 4155 error = priv_check(td, PRIV_VFS_ADMIN); 4156 if (error != 0) 4157 goto out; 4158 } 4159 if (vp->v_usecount > 1 || vcount(vp) > 1) 4160 VOP_REVOKE(vp, REVOKEALL); 4161 out: 4162 vput(vp); 4163 return (error); 4164 } 4165 4166 /* 4167 * Convert a user file descriptor to a kernel file entry and check that, if it 4168 * is a capability, the correct rights are present. A reference on the file 4169 * entry is held upon returning. 4170 */ 4171 int 4172 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4173 { 4174 struct file *fp; 4175 int error; 4176 4177 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp); 4178 if (error != 0) 4179 return (error); 4180 4181 /* 4182 * The file could be not of the vnode type, or it may be not 4183 * yet fully initialized, in which case the f_vnode pointer 4184 * may be set, but f_ops is still badfileops. E.g., 4185 * devfs_open() transiently create such situation to 4186 * facilitate csw d_fdopen(). 4187 * 4188 * Dupfdopen() handling in kern_openat() installs the 4189 * half-baked file into the process descriptor table, allowing 4190 * other thread to dereference it. Guard against the race by 4191 * checking f_ops. 4192 */ 4193 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4194 fdrop(fp, td); 4195 return (EINVAL); 4196 } 4197 *fpp = fp; 4198 return (0); 4199 } 4200 4201 /* 4202 * Get an (NFS) file handle. 4203 */ 4204 #ifndef _SYS_SYSPROTO_H_ 4205 struct lgetfh_args { 4206 char *fname; 4207 fhandle_t *fhp; 4208 }; 4209 #endif 4210 int 4211 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4212 { 4213 4214 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4215 UIO_USERSPACE, uap->fhp)); 4216 } 4217 4218 #ifndef _SYS_SYSPROTO_H_ 4219 struct getfh_args { 4220 char *fname; 4221 fhandle_t *fhp; 4222 }; 4223 #endif 4224 int 4225 sys_getfh(struct thread *td, struct getfh_args *uap) 4226 { 4227 4228 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4229 uap->fhp)); 4230 } 4231 4232 /* 4233 * syscall for the rpc.lockd to use to translate an open descriptor into 4234 * a NFS file handle. 4235 * 4236 * warning: do not remove the priv_check() call or this becomes one giant 4237 * security hole. 4238 */ 4239 #ifndef _SYS_SYSPROTO_H_ 4240 struct getfhat_args { 4241 int fd; 4242 char *path; 4243 fhandle_t *fhp; 4244 int flags; 4245 }; 4246 #endif 4247 int 4248 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4249 { 4250 4251 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0) 4252 return (EINVAL); 4253 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4254 uap->fhp)); 4255 } 4256 4257 static int 4258 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4259 enum uio_seg pathseg, fhandle_t *fhp) 4260 { 4261 struct nameidata nd; 4262 fhandle_t fh; 4263 struct vnode *vp; 4264 int error; 4265 4266 error = priv_check(td, PRIV_VFS_GETFH); 4267 if (error != 0) 4268 return (error); 4269 NDINIT_AT(&nd, LOOKUP, ((flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 4270 FOLLOW) | ((flags & AT_BENEATH) != 0 ? BENEATH : 0) | LOCKLEAF | 4271 AUDITVNODE1, pathseg, path, fd, td); 4272 error = namei(&nd); 4273 if (error != 0) 4274 return (error); 4275 NDFREE(&nd, NDF_ONLY_PNBUF); 4276 vp = nd.ni_vp; 4277 bzero(&fh, sizeof(fh)); 4278 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4279 error = VOP_VPTOFH(vp, &fh.fh_fid); 4280 vput(vp); 4281 if (error == 0) 4282 error = copyout(&fh, fhp, sizeof (fh)); 4283 return (error); 4284 } 4285 4286 #ifndef _SYS_SYSPROTO_H_ 4287 struct fhlink_args { 4288 fhandle_t *fhp; 4289 const char *to; 4290 }; 4291 #endif 4292 int 4293 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4294 { 4295 4296 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4297 } 4298 4299 #ifndef _SYS_SYSPROTO_H_ 4300 struct fhlinkat_args { 4301 fhandle_t *fhp; 4302 int tofd; 4303 const char *to; 4304 }; 4305 #endif 4306 int 4307 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4308 { 4309 4310 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4311 } 4312 4313 static int 4314 kern_fhlinkat(struct thread *td, int fd, const char *path, 4315 enum uio_seg pathseg, fhandle_t *fhp) 4316 { 4317 fhandle_t fh; 4318 struct mount *mp; 4319 struct vnode *vp; 4320 int error; 4321 4322 error = priv_check(td, PRIV_VFS_GETFH); 4323 if (error != 0) 4324 return (error); 4325 error = copyin(fhp, &fh, sizeof(fh)); 4326 if (error != 0) 4327 return (error); 4328 do { 4329 bwillwrite(); 4330 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4331 return (ESTALE); 4332 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4333 vfs_unbusy(mp); 4334 if (error != 0) 4335 return (error); 4336 VOP_UNLOCK(vp); 4337 } while ((error = kern_linkat_vp(td, vp, fd, path, pathseg)) == EAGAIN); 4338 return (error); 4339 } 4340 4341 #ifndef _SYS_SYSPROTO_H_ 4342 struct fhreadlink_args { 4343 fhandle_t *fhp; 4344 char *buf; 4345 size_t bufsize; 4346 }; 4347 #endif 4348 int 4349 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4350 { 4351 fhandle_t fh; 4352 struct mount *mp; 4353 struct vnode *vp; 4354 int error; 4355 4356 error = priv_check(td, PRIV_VFS_GETFH); 4357 if (error != 0) 4358 return (error); 4359 if (uap->bufsize > IOSIZE_MAX) 4360 return (EINVAL); 4361 error = copyin(uap->fhp, &fh, sizeof(fh)); 4362 if (error != 0) 4363 return (error); 4364 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4365 return (ESTALE); 4366 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4367 vfs_unbusy(mp); 4368 if (error != 0) 4369 return (error); 4370 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4371 vput(vp); 4372 return (error); 4373 } 4374 4375 /* 4376 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4377 * open descriptor. 4378 * 4379 * warning: do not remove the priv_check() call or this becomes one giant 4380 * security hole. 4381 */ 4382 #ifndef _SYS_SYSPROTO_H_ 4383 struct fhopen_args { 4384 const struct fhandle *u_fhp; 4385 int flags; 4386 }; 4387 #endif 4388 int 4389 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4390 { 4391 struct mount *mp; 4392 struct vnode *vp; 4393 struct fhandle fhp; 4394 struct file *fp; 4395 int fmode, error; 4396 int indx; 4397 4398 error = priv_check(td, PRIV_VFS_FHOPEN); 4399 if (error != 0) 4400 return (error); 4401 indx = -1; 4402 fmode = FFLAGS(uap->flags); 4403 /* why not allow a non-read/write open for our lockd? */ 4404 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4405 return (EINVAL); 4406 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4407 if (error != 0) 4408 return(error); 4409 /* find the mount point */ 4410 mp = vfs_busyfs(&fhp.fh_fsid); 4411 if (mp == NULL) 4412 return (ESTALE); 4413 /* now give me my vnode, it gets returned to me locked */ 4414 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4415 vfs_unbusy(mp); 4416 if (error != 0) 4417 return (error); 4418 4419 error = falloc_noinstall(td, &fp); 4420 if (error != 0) { 4421 vput(vp); 4422 return (error); 4423 } 4424 /* 4425 * An extra reference on `fp' has been held for us by 4426 * falloc_noinstall(). 4427 */ 4428 4429 #ifdef INVARIANTS 4430 td->td_dupfd = -1; 4431 #endif 4432 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4433 if (error != 0) { 4434 KASSERT(fp->f_ops == &badfileops, 4435 ("VOP_OPEN in fhopen() set f_ops")); 4436 KASSERT(td->td_dupfd < 0, 4437 ("fhopen() encountered fdopen()")); 4438 4439 vput(vp); 4440 goto bad; 4441 } 4442 #ifdef INVARIANTS 4443 td->td_dupfd = 0; 4444 #endif 4445 fp->f_vnode = vp; 4446 fp->f_seqcount[UIO_READ] = 1; 4447 fp->f_seqcount[UIO_WRITE] = 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 if (infp->f_ops == &badfileops) { 4741 error = EBADF; 4742 goto out; 4743 } 4744 if (infp->f_vnode == NULL) { 4745 error = EINVAL; 4746 goto out; 4747 } 4748 error = fget_write(td, outfd, &cap_write_rights, &outfp); 4749 if (error != 0) 4750 goto out; 4751 if (outfp->f_ops == &badfileops) { 4752 error = EBADF; 4753 goto out; 4754 } 4755 if (outfp->f_vnode == NULL) { 4756 error = EINVAL; 4757 goto out; 4758 } 4759 4760 /* Set the offset pointers to the correct place. */ 4761 if (inoffp == NULL) 4762 inoffp = &infp->f_offset; 4763 if (outoffp == NULL) 4764 outoffp = &outfp->f_offset; 4765 savinoff = *inoffp; 4766 savoutoff = *outoffp; 4767 4768 invp = infp->f_vnode; 4769 outvp = outfp->f_vnode; 4770 /* Sanity check the f_flag bits. */ 4771 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE || 4772 (infp->f_flag & FREAD) == 0) { 4773 error = EBADF; 4774 goto out; 4775 } 4776 4777 /* If len == 0, just return 0. */ 4778 if (len == 0) 4779 goto out; 4780 4781 /* 4782 * If infp and outfp refer to the same file, the byte ranges cannot 4783 * overlap. 4784 */ 4785 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len > 4786 savoutoff) || (savinoff > savoutoff && savoutoff + len > 4787 savinoff))) { 4788 error = EINVAL; 4789 goto out; 4790 } 4791 4792 /* Range lock the byte ranges for both invp and outvp. */ 4793 for (;;) { 4794 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp + 4795 len); 4796 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp + 4797 len); 4798 if (rl_rcookie != NULL) 4799 break; 4800 vn_rangelock_unlock(outvp, rl_wcookie); 4801 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len); 4802 vn_rangelock_unlock(invp, rl_rcookie); 4803 } 4804 4805 retlen = len; 4806 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen, 4807 flags, infp->f_cred, outfp->f_cred, td); 4808 out: 4809 if (rl_rcookie != NULL) 4810 vn_rangelock_unlock(invp, rl_rcookie); 4811 if (rl_wcookie != NULL) 4812 vn_rangelock_unlock(outvp, rl_wcookie); 4813 if (savinoff != -1 && (error == EINTR || error == ERESTART)) { 4814 *inoffp = savinoff; 4815 *outoffp = savoutoff; 4816 } 4817 if (outfp != NULL) 4818 fdrop(outfp, td); 4819 if (infp != NULL) 4820 fdrop(infp, td); 4821 td->td_retval[0] = retlen; 4822 return (error); 4823 } 4824 4825 int 4826 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap) 4827 { 4828 off_t inoff, outoff, *inoffp, *outoffp; 4829 int error; 4830 4831 inoffp = outoffp = NULL; 4832 if (uap->inoffp != NULL) { 4833 error = copyin(uap->inoffp, &inoff, sizeof(off_t)); 4834 if (error != 0) 4835 return (error); 4836 inoffp = &inoff; 4837 } 4838 if (uap->outoffp != NULL) { 4839 error = copyin(uap->outoffp, &outoff, sizeof(off_t)); 4840 if (error != 0) 4841 return (error); 4842 outoffp = &outoff; 4843 } 4844 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd, 4845 outoffp, uap->len, uap->flags); 4846 if (error == 0 && uap->inoffp != NULL) 4847 error = copyout(inoffp, uap->inoffp, sizeof(off_t)); 4848 if (error == 0 && uap->outoffp != NULL) 4849 error = copyout(outoffp, uap->outoffp, sizeof(off_t)); 4850 return (error); 4851 } 4852